JP3790246B2 - Liquid crystal display - Google Patents

Description

The present invention relates to a liquid crystal display device backlight disposed behind the liquid crystal panel.

Since a liquid crystal panel of a liquid crystal display device does not self-emit, it generally has a backlight that emits light to brighten the screen.
As a backlight for a large-screen liquid crystal display device, a direct type that can easily cope with a large screen is often used. The direct type backlight is configured by providing a fluorescent lamp inside a hollow casing having a diffusion plate on one surface. The light from the fluorescent lamp, which is a linear light source, is diffused by the diffusion plate, and is applied to the liquid crystal panel as planar light having substantially uniform luminance. Such a liquid crystal display device is described in Patent Document 1, for example.

The diffusing plate of the direct type backlight has an important function of diffusing light in order to obtain a light emitting surface with less non-uniformity from the light of the light source. The conventional liquid crystal panel assumes that the entire screen is irradiated with uniform light from the backlight. Therefore, when non-uniform light, for example, light with a lamp image remaining on it, is irradiated on the screen of the liquid crystal panel. Differences in brightness occur and the screen quality is impaired.
For this reason, the direct type backlight is required to have a uniform light emission quality over the entire light emitting surface.

  In order to keep the backlight in high quality, it was necessary to inspect the light emitting surface for dark areas due to foreign matter and abnormal light emission when manufacturing the backlight. In particular, the direct type backlight has a space for the light source to be located behind the diffusion plate, and the light emission quality is easily impaired by the entry of foreign matter into this space. The inspection of the backlight as described above increases the manufacturing cost of the backlight, and as a result, the cost of the liquid crystal display device is high.

In addition, the diffusion plate has a certain thickness and weight in order to ensure light diffusibility, and thus prevents the weight of the direct type backlight from being reduced. Furthermore, since the diffusion plate is made of a synthetic resin, warpage due to heat or water absorption is likely to occur, and it may be deteriorated by long-term use.
JP 2003-43481 A

An object of the present invention is to provide a liquid crystal panel and a liquid crystal display device which can obtain a good screen quality even when non-uniform light is irradiated from a backlight.
Another object of the present invention is to simplify the configuration.

According to a first aspect of the present invention , there is provided a direct type backlight in which a support portion for supporting a liquid crystal panel is formed on an upper side surface of a lamp case having a plurality of light sources therein, and the upper surface opening of the lamp case is closed. A liquid crystal panel placed on a support portion, and the direct type backlight has a hollow inside of the lamp case and a diffusion plate supported by the lamp case for diffusing the light of the light source. The liquid crystal panel is directly opposed to the light source, and is configured such that light from the light source of the backlight is directly irradiated onto the liquid crystal panel from behind the liquid crystal panel, The screen can be formed with liquid crystal sandwiched between opposing substrates, and has a rectangular screen area for forming the liquid crystal screen, and the four peripheral edges of the screen area are frame-shaped non-screen areas. The liquid crystal panel body has a diffusion film as a diffusion layer for diffusing the light transmitted through the liquid crystal panel body on the direct backlight side, and the diffusion film is transparent. A diffusing agent is applied to one or both surfaces of the film substrate so as to have a diffusive surface, and the diffusive film has a surface having the diffusivity of the liquid crystal panel main body or the liquid crystal panel main body. The diffusion film and the liquid crystal panel main body or other optical so that an air layer is provided on the surface of the diffusive surface while facing the other optical film provided on the direct type backlight side. The film is affixed partially in the non-screen region of the liquid crystal panel body, and refracts light passing through the air layer and the diffusive surface. Is a liquid crystal display device characterized that in use is configured to obtain a diffusing effect.
Even when non-uniform light is irradiated from the backlight, the liquid crystal panel itself has light diffusibility due to the diffusion layer, so that the light is uniformed by the light diffusing action and the screen quality is improved.
In addition, since it is very thin if it is a diffusion film, a diffusion layer can be comprised easily, without causing a weight increase and an enlargement. The diffusion film preferably has a thickness of 1 mm or less. Furthermore, 0.5 mm or less is preferable. Further, the thickness of the diffusion film is preferably 0.05 mm or more.

According to a second aspect of the present invention, there is provided a direct-type backlight in which a support portion for supporting a liquid crystal panel is formed on an upper side surface of a lamp case having a plurality of light sources therein, and the upper surface opening of the lamp case is closed. A liquid crystal panel placed on a support portion, and the direct type backlight has a hollow inside of the lamp case and a diffusion plate supported by the lamp case for diffusing the light of the light source. The liquid crystal panel is directly opposed to the light source, and is configured such that light from the light source of the backlight is directly irradiated onto the liquid crystal panel from behind the liquid crystal panel, The screen can be formed with liquid crystal sandwiched between opposing substrates, and has a rectangular screen area for forming the liquid crystal screen, and the four peripheral edges of the screen area are frame-shaped non-screen areas. A liquid crystal panel main body, the liquid crystal panel main body having a diffusion layer that diffuses light transmitted through the liquid crystal panel main body on the direct-type backlight side, and the liquid crystal panel main body includes A lens film is also provided on the surface of the mold backlight side as a luminance enhancement layer for increasing the luminance of light transmitted through the liquid crystal panel, and the diffusion layer is an air layer on the surface on one surface side of the film substrate. The lens film has a diffusive surface formed by a diffusing agent formed by coating so as to exist or fine irregularities formed so that an air layer exists on the surface, and the lens film has a lens on the film surface. The diffusion layer and the lens film have at least one of the liquid crystal panel partially in the non-screen area of the liquid crystal panel body. By affixed to the reel body side, surface having the diffusion properties of the diffusion layer, even while facing the other optical film provided in the direct type backlight side of the liquid crystal panel body or liquid crystal panel body An air layer is provided on both the diffusive surface and the lens surface of the diffusion layer, and the liquid crystal panel passes through the air layer and the diffusive surface of the diffusion layer. The liquid crystal display device is configured to obtain a diffusing effect by utilizing light refraction and to secure a condensing function by a lens surface.

A third invention is characterized in that the diffusion layer has a total light transmittance of 30 to 70% of light from a backlight.

According to a fourth aspect of the present invention, in the liquid crystal display device, the diffusion layer is provided with light diffusibility on the substrate on the backlight side of the liquid crystal panel body. Since the liquid crystal panel substrate is provided with light diffusibility, the number of parts constituting the liquid crystal panel is not increased, and an increase in cost can be prevented. Even if non-uniform light is irradiated from the backlight, the light is uniformed by the light-diffusing substrate on the backlight side, which is in front of the liquid crystal, and the screen quality is improved. The substrate may be a glass substrate or a plastic substrate. Further, the opposing substrate may sandwich not only the liquid crystal but also a color filter or the like.

According to a fifth aspect of the present invention, the substrate on the backlight side having the diffusibility is not subjected to light diffusion treatment on the inner surface on the liquid crystal side and is subjected to light diffusion treatment on the outer surface. It is characterized by being.
If the surface on the liquid crystal side is subjected to light diffusion treatment (for example, application of a diffusing agent such as beads (diffusion beads) or fine concavo-convex processing by sand blasting, etching, etc.), alignment of liquid crystal molecules may be hindered. Further, the diffusion action (improvement of the lamp image) uses the refraction of light passing through a diffusive surface (layer) and a layer having a different refractive index. Since the difference is smaller than that of air, it is difficult to obtain a diffusion effect even if the inner surface on the liquid crystal side is made diffusive.
On the other hand, the light diffusion treatment is not performed on the inner surface on the liquid crystal side, and the light diffusion treatment is performed on the outer surface, so that an effective diffusion effect can be obtained without inhibiting the alignment of liquid crystal molecules.

According to a sixth aspect of the present invention, the diffusion layer is formed by directly applying a diffusing agent to the surface of the liquid crystal panel body on the backlight side. If a diffusing agent is applied, a diffusion layer can be easily constructed without causing an increase in weight or an increase in size.

According to a seventh aspect of the invention, the liquid crystal panel includes the diffusion layer on a backlight side surface, and the backlight side surface of the liquid crystal panel further increases the luminance of light transmitted through the liquid crystal panel. A lens layer and a polarizing layer are also provided as the brightness enhancement layer.
In an eighth aspect of the invention, a polarizing layer is also provided as the brightness enhancement layer.
When the liquid crystal panel includes the luminance enhancement layer, the screen can be brightened even when the luminance on the backlight side is low or light loss occurs in the liquid crystal panel.

According to a ninth aspect of the present invention, there is provided a direct type backlight in which a support portion for supporting a liquid crystal panel is formed on an upper side surface of a lamp case having a plurality of light sources therein, and the upper surface opening of the lamp case, A liquid crystal panel placed on a support portion, and the direct type backlight has a hollow inside of the lamp case and a diffusion plate supported by the lamp case for diffusing the light of the light source. The liquid crystal panel is directly opposed to the light source, and is configured such that light from the light source of the backlight is directly irradiated onto the liquid crystal panel from behind the liquid crystal panel, A liquid crystal panel body having a liquid crystal sandwiched between opposing substrates and capable of forming a screen, wherein the liquid crystal panel body transmits the liquid crystal panel body to the direct type backlight side It comprises a diffusion layer that diffuses light, and the diffusion layer is formed by a diffusing agent that is formed by coating so that an air layer is present on the surface or by fine irregularities that are formed so that an air layer is present on the surface. And is configured to obtain a diffusion effect using refraction of light passing through the air layer and the diffusion layer, and the liquid crystal panel body has a surface on the backlight side of the liquid crystal panel body. A bonded film holding member is provided, and the film holding member is an optical film arranged without being attached to the surface of the liquid crystal panel body on the backlight side, without being supported by the backlight. The surface of the optical film on the backlight side is held so as not to drop off from the liquid crystal panel body.
Since the liquid crystal panel body has a film holding member, the optical film can be easily held on the liquid crystal panel. Examples of the optical film include a diffusion film, a lens film, and a diffusion film. The thickness of the optical film is preferably 1 mm or less, and more preferably 0.5 mm or less. Further, the thickness of the optical film is preferably 0.05 mm or more.
Furthermore, if the optical film is held by a holding member and is not fixedly attached to the liquid crystal panel body, the liquid crystal panel is provided with an optical film while avoiding peeling or bending due to thermal shrinkage of the optical film. Can be made.

In a tenth aspect of the present invention, the film holding member has a sheet peripheral edge adhered to a peripheral edge on the backlight side of the liquid crystal panel main body, and an inner region of the sheet peripheral edge is not relative to the liquid crystal panel main body. bonded wear der Rutotomoni, wherein a package sheet provided as the light of the light source of the backlight is illuminated from behind, the optical film is accommodated between the liquid crystal panel body and the package sheet It is characterized by that. By using a package sheet, it is possible to easily attach any number of optical films. Moreover, since the optical film is not directly attached to the liquid crystal panel main body, the problems of thermal shrinkage and bending of the optical film can be avoided.
The package sheet may have a function as an optical film such as a diffusion film.

The present invention of a 11, the film holding member, wherein a peripheral portion engaged with the engagement portion provided on the periphery of the liquid crystal panel body to retain the optical film of optical films, the engagement In order to hold the optical film by catching the peripheral portion of the optical film so that the optical film does not fall off the liquid crystal panel body even if the optical film is not supported by the backlight, It has the extended engagement nail | claw, It is characterized by the above-mentioned. In the case where the optical film is held by engagement, the optical film is not directly attached to the liquid crystal panel body, so that the problems of thermal shrinkage and deflection of the optical film can be avoided.

  According to the present invention, good screen quality can be obtained even when non-uniform light is irradiated from the backlight.

Hereinafter, embodiments of a liquid crystal display device will be described with reference to the drawings. The liquid crystal display device 1 shown in FIG. 1 includes a liquid crystal panel 2 and a backlight B that irradiates light to the liquid crystal panel 2 as a basic configuration.
The backlight B is configured by arranging a plurality of light sources 4 composed of cold cathode fluorescent lamps (linear light sources) in a lamp case 3, and is a direct type backlight that irradiates light from the light source 4 from behind the liquid crystal panel. . This direct type backlight B does not include a diffusion plate which is a basic configuration of a normal direct type backlight, and the light from the light source 4 is applied to the liquid crystal panel 3 without passing through the diffusion plate. Therefore, the liquid crystal panel 3 is irradiated not with the uniform planar light but with the light that has left the lamp image of the linear light source 4.

  The lamp case 3 is formed in an upper surface opening shape with side surfaces 3b erected from four sides of a rectangular bottom surface 3a. A support portion 3c that supports the liquid crystal panel 3 is formed on the upper side of the side surface 3b, and the liquid crystal panel 3 is placed on the support portion 3c so as to close the upper surface opening of the lamp case 3. The bottom surface 3a of the lamp case 3 is a reflecting surface for reflecting the light from the light source 4 to the liquid crystal panel 2 side. The reflection surface is preferably not a specular reflection surface but a diffuse reflection surface that diffuses light in various directions. The diffuse reflection surface can be constructed by laying white paint or white film.

  The liquid crystal display device 1 includes an upper case 5 that sandwiches the liquid crystal panel 3 together with the lamp case 3 and fixes and holds the liquid crystal panel 2. The case of the liquid crystal display device 1 is configured by a combination of the upper case 5 and the lamp case 3 which is the lower case. The upper case 5 has a frame shape so that the screen of the liquid crystal panel 2 is exposed.

In this embodiment, when the liquid crystal panel 2 is removed from the lamp case 3, the light source 4 is exposed, so that the light source 4 can be easily replaced. In the conventional liquid crystal display device 1, since the backlight itself includes a diffusion plate, the light source 4 cannot be replaced unless the liquid crystal panel is removed and the diffusion plate is further removed. Replacement of the light source 4 is easy, and maintenance is improved.
Further, in the present embodiment, the liquid crystal display device can be reduced in weight, thickness, and cost because the diffusion plate is not provided. Further, in the direct type backlight, since the inside of the lamp case is hollow, the occurrence of uneven light emission due to the bending of the diffusion plate becomes a problem. However, in this embodiment, the backlight B does not include the diffusion plate, There is no problem due to the bending of the plate.
Furthermore, in this embodiment, since the light from the light source 4 is directly applied to the liquid crystal panel 2, the backlight B is not required to have a light emitting surface with good light emission quality. Therefore, a non-high quality backlight B can be used, and the light emission quality inspection is unnecessary or a simple inspection is sufficient. As a result, the backlight B can be manufactured at low cost, and the liquid crystal display device is also inexpensive.

As shown in FIG. 2, in the liquid crystal panel 2, the liquid crystal 6 is sandwiched between two substrates (glass substrate or plastic substrate) 7 and 8 facing each other. Liquid crystal driving electrodes (not shown) are formed on the inner surfaces 7a and 8a of the substrates 7 and 8 on the liquid crystal 6 side. In FIG. 2, a color filter and a spacer are arranged in the range 6 shown as the liquid crystal layer in addition to the liquid crystal.
Polarizing filters 9 and 10 are arranged on the outer surfaces 7b and 8b side of the two substrates 7 and 8 so as to sandwich the substrates 7 and 8, and the light from the backlight B passes through these polarizing filters 9 and 10.・ Non-passage is controlled and a screen is formed.
Below, the part which consists of essential components as the liquid crystal panel 2 for forming liquid crystal screens, such as the liquid crystal 6, the board | substrates 7 and 8, and the polarizing filters 9 and 10, is called a liquid crystal panel main body.

Of the two substrates 7 and 8 facing each other with the liquid crystal 6 interposed therebetween, the backlight-side substrate 7 (hereinafter referred to as “first substrate 7”) is formed as a light-diffusing plate. The light diffusing plate 7 is obtained, for example, by forming a diffusion layer by applying a diffusing agent 71 such as beads on the surface of a transparent plate (transparent glass substrate) 70 as shown in FIG. The upper limit of the thickness of the diffusion layer by the diffusing agent 71 is preferably 80 μm, and more preferably 40 μm. Further, the lower limit of the thickness of the diffusion layer by the diffusing agent 71 is preferably 5 μm, and more preferably 20 μm. Since the diffusion layer is thin, an increase in weight and an increase in size of the liquid crystal panel can be avoided even if the liquid crystal panel has diffusibility.
The other substrate 8 (hereinafter referred to as “second substrate 8”) is a transparent plate (glass substrate).

Since the first substrate 7 has diffusibility, the liquid crystal panel body becomes the liquid crystal panel 2 with a light diffusion function. The light from the backlight B is diffused in the first substrate 7 (the diffusion layer), and the lamp image is improved. That is, the light emission quality of the backlight B may be low because the liquid crystal panel itself improves even if the quality of the light emitted from the backlight B is low.
Further, since the diffusion layer is provided on the backlight B side of the liquid crystal of the liquid crystal panel body and light diffusion is performed, the screen quality can be kept good. In other words, in the present embodiment, the first substrate 7 on the backlight B side has diffusibility, whereas the second substrate 8 is a transparent plate and has substantially no diffusibility. Therefore, the liquid crystal screen is prevented from blurring. Thus, the lamp image is improved while minimizing the influence on the liquid crystal screen. If the influence on the liquid crystal screen is not particularly problematic, the second substrate 8 can also have light diffusibility, and the lamp image can be further improved.

In order to effectively relieve the lamp image with a thin diffusion layer, the diffusion layer preferably has a low total light transmittance and a high total light reflectance. By increasing the reflectance, the light from the backlight B does not pass through the liquid crystal panel main body 2 at a time, but more light is reflected to the backlight B side, and again by re-reflection by the inner surface of the lamp case 3 Head to the liquid crystal panel body 2. When the number of times of light reflection increases, the light is easily made uniform, and the lamp image is relaxed.
The upper limit of the total light transmittance (test method: JIS K7361) of the diffusion layer is preferably 70%, and more preferably 65%. Further, the lower limit of the total light transmittance is preferably 30%, and more preferably 50%.
The upper limit of the total light reflectance of the diffusion layer (test method: JIS K7105) is preferably 70%, and more preferably 50%. Further, the lower limit of the total light reflectance is preferably 30%, and more preferably 40%.
The haze value of the diffusion layer is preferably 100% as the upper limit. Further, the lower limit of the haze value is preferably 60%, and more preferably 90%.

When the light diffusibility of the substrate 7 is obtained by applying a diffusing agent to the substrate surface, the degree of light diffusion can be easily adjusted by the amount of application, etc., and the strength and accuracy of the substrate (glass substrate) 7 itself are reduced. It is possible to obtain diffusibility without causing it. In addition, since the diffusion layer is formed on the glass substrate 7, it is not necessary to consider deformation like the diffusion plate. Furthermore, since the diffusion layer is provided inside the liquid crystal panel body, the diffusion layer is not exposed and deterioration is prevented.
The light diffusing layer formed on the substrate 7 can be configured as fine irregularities formed by sandblasting or etching on the surfaces 7a and 7b of the substrate 7 in addition to the application of a diffusing agent. Since the diffusion layer formed in this way is also thin, an increase in weight and an increase in size of the liquid crystal panel 2 can be avoided.

It is preferable that the diffusion agent 71 is applied to the substrate 7 (light diffusion treatment) only on the outer surface 7b on the backlight side, and the inner surface 7a on the liquid crystal 6 side is not applied (light diffusion treatment). This is because the inner surface 7a on the liquid crystal side 6 may play a role of aligning liquid crystal molecules, and if the inner surface 7a is an uneven surface, it may hinder uniform and good screen display.
The light diffusion effect uses refraction of light passing through a diffusive surface (layer) and a layer having a different refractive index, and the larger the difference in refractive index between the two layers, the better the improvement of the lamp image. can get. Here, although the polarizing filter 9 is disposed on the outer surface 7b of the substrate 7, the substrate 7 and the polarizing filter 9 are not completely in close contact with each other, and a substantially air layer is formed between them. Exists. And an air layer and glass have a larger difference in refractive index than liquid crystal and glass.
Therefore, compared with the case where the diffusing surface 71 is provided on the inner surface 7a, it is possible to improve the lamp image with a larger refractive index when the diffusing surface 71 is provided on the outer surface 7b.

  In order to obtain the diffusible substrate 7, the following means can also be employed. For example, after a sandblast treatment is performed on a transparent glass substrate, a hydrogen fluoride treatment is performed to obtain a frosted glass. Alternatively, a matte process is performed by rubbing a transparent glass substrate with gold sand or the like. In these cases, light diffusibility can be obtained by fine irregularities on the substrate surface.

In the present embodiment, the backlight B is not provided with not only a diffusion plate but also an optical film, but an optical film may be installed between the liquid crystal panel 2 and the light source 4 as necessary. For example, a reflective polarizing film (DBEF manufactured by 3M, etc.) can be disposed between the liquid crystal panel 2 and the light source 4, and the polarizing axes of the reflective polarizing film and the polarizing film 9 can be matched. In this case, the light that does not pass through the polarizing film 9 is not absorbed by the polarizing film 9 but is reflected to the backlight B side by the reflective polarizing film, so that the light is reused, resulting in a screen brightness. To rise.
Such a liquid crystal panel including an optical film will be described in detail in an embodiment described later.
Note that the optical film may be a diffusion film, a lens film, or the like.

FIG. 4 shows a liquid crystal display device 101 according to a reference example. The liquid crystal panel main body 102 of the liquid crystal display device 101, like the liquid crystal panel main body 2 described above, sandwiches liquid crystal between two opposing substrates (glass substrate or plastic substrate), and on the outer surface side of the two substrates. A polarizing filter is disposed so as to sandwich the substrate.
However, the substrates 7 and 8 sandwiching the liquid crystal are both transparent. Note that the substrate may have diffusibility as shown in FIG. 2, and in this case, all of the descriptions described above with reference to FIGS. 1 to 3 can be applied to the examples described later.
In addition, all of the examples of the liquid crystal panel described below are configured as a liquid crystal panel with a light diffusion function by integrally including a light diffusion layer outside the liquid crystal panel main body 102.

The backlight B of the liquid crystal display device 101 according to the reference example includes a light source 104 in a lamp case 103. However, the backlight B itself does not include the diffusion plate 110.
A diffusion plate 110 is provided as a diffusion layer for diffusing light from the light source of the backlight B. The diffusion plate 10 is joined and integrated with the liquid crystal panel main body 102. That is, the diffusion plate 110 is attached to the surface of the liquid crystal panel 102 on the backlight B side, so that the liquid crystal panel 102 with the diffusion plate is formed. As the diffusion plate 110, a plastic plate in which a diffusion agent is mixed can be used. The thickness of the diffusion plate 110 is preferably within 2 mm. This is because if the diffusion plate 110 is thick, the liquid crystal panel 102 is affected by the expansion and contraction of the diffusion plate 110. In order to ensure diffusibility, the thickness of the diffusion plate 110 is preferably greater than 1 mm.
As a second embodiment of the present invention, a thin diffusion film can be provided in the liquid crystal panel main body 102 instead of the diffusion plate 110. The diffusion film attached to the surface of the liquid crystal panel main body 102 preferably has a thickness of 1 mm or less. The thickness of the diffusion film is preferably 0.5 mm or more. In addition, a water absorption preventing layer can be formed on the diffusion plate 110 or the diffusion film to prevent bending.

  In the liquid crystal display device 101 of FIG. 4, the backlight B itself does not include a diffusion plate, and the liquid crystal panel main body 102 includes the diffusion plate 110 or the diffusion film. Unevenness does not occur. Further, since the diffusion plate 110 or the diffusion film is thin, the weight can be reduced. In particular, when a diffusion film having a thickness of 1 mm or less is attached to the liquid crystal main body as in the second embodiment, the diffusion film has almost no weight and can effectively prevent weight increase and enlargement. Further, even if the diffusion film expands and contracts, the liquid crystal panel main body 102 has sufficiently higher hardness, so that the liquid crystal panel main body 102 is hardly distorted.

Furthermore, in the second embodiment, since the light source 104 is exposed only by removing the liquid crystal panel from the lamp case 103, the light source 104 can be easily replaced.
In addition, when the substrates 7 and 8 of the liquid crystal panel also have diffusibility, a liquid crystal panel having high diffusibility by the substrates 7 and 8 and the diffusion plate 110 can be obtained.
The liquid crystal panel is held by being sandwiched between the upper case 105 and the lamp case 3.

  FIG. 5 is a plan view of the liquid crystal panel body 102 as viewed from the backlight B side. The liquid crystal panel 102 has a rectangular screen region 102a that forms a liquid crystal screen, and a peripheral portion of the four sides of the screen region is a frame-shaped non-screen region 102b. The screen area 102a is an area that needs to be irradiated with high-quality light in order to form a screen, whereas the non-screen area 102b is an area that does not form a screen, and thus the quality of light is not required.

  Here, the diffusion film is formed by applying a diffusion agent 120b such as diffusion beads to one surface (or both surfaces) of the transparent film substrate 120a. Such a diffusion film 120 can be applied to the entire surface of the liquid crystal panel main body 102 as shown in FIG. When the entire surface is attached, it is preferable that the surface of the diffusion bead 120b is opposite to the liquid crystal panel body 102 and the diffusion agent 120b is attached so as not to contact the liquid crystal panel body 102. When the diffusing agent 120b is on the liquid crystal panel body 102 side, the surface of the diffusing agent 120b is covered with an adhesive or the like, and the diffusion effect due to the difference in refractive index is reduced. It is preferable that the agent 120b is opposite to the liquid crystal panel main body 102 side.

Further, the diffusion film 120 can be partially attached to the liquid crystal panel main body 102 as shown in FIGS.
By partially pasting the diffusion film 120 and the liquid crystal panel main body 102 in the non-screen region 102b, it is possible to avoid the disturbance of light at the pasting location on the screen.
As shown in FIG. 6B, even if the surface on the diffusing agent 120b side is the liquid crystal panel 102 side, the liquid crystal panel main body 102 and the diffusing film diffusing agent 120b in the screen region 102b Is non-adhesive, and an air layer is present on the surface of the diffusing agent 102b, so that a diffusion effect can be obtained efficiently.
Further, as shown in FIG. 6C, the surface on the diffusing agent 120b side may be the backlight B side.
The diffusion film 120 and the liquid crystal panel main body 102 can be attached by a bonding means 125 such as adhesive bonding, potting, or welding.

The part where the diffusion film 120 and the liquid crystal panel main body 102 are partially attached may be the entire non-screen region 102b, or any one of the four sides, two sides, or three sides. By not sticking all four sides, even if the diffusion film 120 expands due to heat or the like, it becomes difficult to bend.
When only the non-screen area 102b having two sides is used as the pasting location, the two opposing sides may be used or two adjacent sides may be used.
In the following, “partial pasting” mainly refers to pasting in the non-screen area 102b.

In order to sufficiently relax the lamp image even with the thin diffusion film 120, the upper limit of the total light transmittance of the diffusion film as the diffusion layer (test method: JIS K7361) is preferably 70%, and more preferably 65%. Further, the lower limit of the total light transmittance is preferably 30%, and more preferably 50%.
The upper limit of the total light reflectance (test method: JIS K7105) of the diffusion film 120 as the diffusion layer is preferably 70%, and more preferably 50%. Further, the lower limit of the total light reflectance is preferably 30%, and more preferably 40%.
As described above, the lamp image is easily relaxed by increasing the reflectance.
The haze value of the diffusion film 120 is preferably 100% as the upper limit. Further, the lower limit of the haze value is preferably 60%, and more preferably 90%.
In addition, the transmittance | permeability, the reflectance, and haze value of the said diffusion film 120 are the same also in below-mentioned embodiment.

FIG. 7 shows a liquid crystal panel according to the third embodiment. In this liquid crystal panel, a diffusion layer is formed by applying a diffusion agent 120b such as diffusion beads to the surface of the liquid crystal panel main body 102 on the backlight side. By directly applying the diffusing agent 120b to the liquid crystal panel main body 102, there is no need to stick a diffusion film or the like, and the cost can be reduced.
In addition to the diffusing agent 120b, the diffusion layer may be formed by adding fine irregularities to the surface on the backlight side of the liquid crystal panel 102 by sandblasting or etching.
The total light transmittance and total light reflectance of the diffusion layer by the diffusing agent 120b are preferably set in the same manner as the diffusion film 120 described above.

FIG. 8 shows a liquid crystal panel according to the fourth embodiment. This liquid crystal panel is configured by providing a liquid crystal panel main body 102 with a combination of a diffusion layer 120 b and a lens layer (lens film; prism film) 130. As the diffusion layer, a layer formed directly on the liquid crystal panel main body 102 by the diffusion agent 120b or the like as in the third embodiment is employed.
The lens film 130 is formed by forming a large number of fine ridges (prisms) on the film surface to form a lens surface 130a. The lens film 130 condenses light by the lens action of the lens surface 130a to increase the luminance. That is, the lens film 130 here functions as a brightness enhancement layer. In addition, the cross-sectional shape of a protruding item | line can be made into a triangular shape, a semicircle, and other convex shapes.
When the lens film (optical film) 130 is further attached to the liquid crystal panel main body 102 having the diffusion layer 120b formed on the surface, the entire lens film 130 is attached to the diffusion layer 120b as shown in FIG. Since there is no air layer on the surface of the diffusing layer 120b and the diffusing action is reduced, it is preferable that the lens film 130 is partially attached as shown in FIGS. The non-screen area 102b of the liquid crystal panel main body is preferable as the partial pasting part.

The lens surface 130a may face the backlight B side as shown in FIG. 8B, or may face the liquid crystal panel main body 102 side as shown in FIG. 8C. When the lens surface 130a faces the backlight B side (downward), in order to increase the luminance, it is preferable to make the longitudinal direction of the ridges (prisms) and the longitudinal direction of the light source 4 parallel.
When the lens surface 130a faces the liquid crystal panel main body 102 side (upward), the direction of the ridge (prism) may be an arbitrary direction. However, since the viewing angle characteristics differ depending on the direction of the ridges (prisms), appropriate consideration may be given. Further, if the entire surface is attached to the diffusion layer 120b when the lens surface 130a is facing upward, not only the diffusion action but also the light condensing action by the lens is lost, so partial attachment is preferable as described above.

FIG. 9 shows a liquid crystal panel according to the fifth embodiment. This liquid crystal panel includes a combination of a diffusion film 120 as a diffusion layer and a lens film 130 as a lens layer.
The lens film 130 may be closer to the liquid crystal panel main body 102 than the diffusion film 120 as shown in FIG. 9A, or the back side of the diffusion film 120 as shown in FIGS. 9B, 9C, and 9D. It may be on the light B side.

The lens film 130 in FIG. 9A may have the lens surface 130a facing downward, but is preferably facing upward. Further, as shown in FIG. 9A, it is preferable that the liquid crystal panel body 102 and the lens film 130 are partially attached, and the lens film 130 and the diffusion film 120 are also partially attached. When the lens film 130 and the diffusion film 120 are partially attached, a surface on which the diffusion agent 120b is applied may be present on either the liquid crystal panel main body 120 side or the backlight B side of the diffusion film 120.
The lens film 130 and the diffusion film 120 may be attached to the entire surface as long as they do not impair the diffusibility and the light condensing property. That is, if the surface of the diffusion film 120 to which the diffusing agent is applied is a non-bonding surface with the lens film 130, the entire surface may be bonded.
Alternatively, the lens layer and the diffusion layer may be integrated by forming a diffusion layer directly on the lens film 130 by, for example, applying a diffusion agent 120b on the surface opposite to the lens surface 130a of the lens film 130.

The lens film 130 of FIG. 9B has a lens surface 130a facing downward. Moreover, it is preferable that the longitudinal direction of the convex line of the lens film 130 is parallel to the longitudinal direction of the lamp. The lens film 130 may be partially attached to the diffusion film 120, but is preferably attached to the entire surface as shown.
It is preferable that the diffusion film 120 to be attached on the entire surface has a surface on the liquid crystal panel main body 102 side to which the diffusion agent 120b is applied in order to secure an air layer between the surface of the diffusion agent 120b and the liquid crystal panel main body 102. The diffusion film 120 and the liquid crystal panel main body 102 are partially attached.

  The lens film 130 of FIG. 9C also has the lens surface 130a facing downward. Moreover, it is preferable that the longitudinal direction of the convex line of the lens film 130 is parallel to the longitudinal direction of the lamp. The lens film 130 and the diffusion film 120 are partially attached, and the diffusion film 120 is attached to the entire surface of the liquid crystal panel 102 with the surface on which the diffusing agent 120b is applied as the lens film 130 side.

  The lens film 130 of FIG. 9D has a lens surface 130 a facing upward, and is partially attached to the diffusion film 120. What is shown in FIG. 9D is the same as that shown in FIG. 8C except that the diffusion layer is constituted by the diffusion film 120.

FIG. 10 shows a liquid crystal panel according to the sixth embodiment. The liquid crystal panel includes a liquid crystal panel body 102 that includes a combination of a diffusion layer 120 (120b) and a polarizing layer (polarizing film) 140.
The polarizing film 140 may be closer to the liquid crystal panel main body 102 than the diffusion layer 120 (120b) as shown in FIGS. 10 (a) and 10 (b), or may be located behind the diffusion layer 120 as shown in FIG. 10 (c). It may be on the light B side.

  The polarizing film 140 is disposed so that the polarization transmission axis thereof faces the same direction as the polarization transmission axis of the backlight side (light incident side) polarization filter 9 of the liquid crystal panel main body 102. Light that does not pass through the polarizing filter 9 of the liquid crystal panel main body 102 is absorbed by the polarizing filter 9 and causes loss of light. However, as the polarizing film 140, a reflective polarizing film that reflects non-transmitted light (for example, 3M company) By using DBEF), light that does not pass through the polarizing film 140 is reflected on the backlight B side and reused, so that the luminance increases. That is, the polarizing film 140 functions as a brightness enhancement layer.

As shown in FIG. 10A, when the polarizing film 140 is attached to the liquid crystal panel main body 102, partial attachment may be used, but attachment to the entire surface is preferable. A diffusion film 120 is further attached as a diffusion layer under the polarizing film 140. As long as the surface of the diffusing agent 120b is on the backlight B side, the diffusion film 120 may be attached to the entire surface or may be attached to the diffusion film 120. When the surface of the diffusing agent 120b is reversed, partial pasting is preferable.
As shown in FIG. 10B, the diffusion layer further provided under the polarizing film 140 may be formed by directly applying the diffusing agent 120b to the surface of the polarizing film 140 on the backlight B side. Moreover, it is good also as a diffused layer by forming fine unevenness | corrugation on the surface of the polarizing film 140 by sandblasting.
As shown in FIG. 10C, when the diffusion film 120 is attached to the liquid crystal panel main body 102 and the polarizing film 140 is attached thereunder, the diffusion film 120 has the surface of the diffusing agent 120b as the polarizing film 140 side. 140 is partially attached to the diffusion film 120. Instead of the diffusion film, fine irregularities directly formed on the surface of the liquid crystal panel main body 102 may be used as the diffusion layer.

FIG. 11 shows a liquid crystal panel according to the seventh embodiment. This liquid crystal panel is configured by combining a liquid crystal panel main body 102 with a combination of a lens layer 130 and a polarizing layer 140. Although the diffusion layer is not shown here, it may be provided inside the liquid crystal panel main body 102 or formed by applying a diffusing agent 120b to the surface of the lens film 130 or the polarizing film 140. It may be.
The polarizing film 140 constituting the polarizing layer may be closer to the backlight B than the lens film 130, but the liquid crystal panel 102 side is preferable as shown in FIG.

As shown in FIG. 11A, when the lens film 130 is directed upward, the polarizing film 140 is attached to the liquid crystal panel main body 102 entirely or partially. The lens film 130 is partially attached to the polarizing film 140.
As shown in FIG. 11B, when the lens film 130 is directed downward, the polarizing film 130 is attached to the liquid crystal panel body 102 entirely or partially. In addition, the lens film 130 may be attached to the entire surface of the polarizing film 140 or may be attached partially. The lens surface 130a may be integrally formed on the surface of the polarizing film 140 on the backlight B side.

12 to 17 show a liquid crystal panel according to the eighth embodiment. This liquid crystal panel is configured by combining a liquid crystal panel main body 102 with a combination of a diffusion layer 120, a lens layer 130, and a polarizing layer 140. In the eighth embodiment, high quality and high brightness can be obtained by relaxing the lamp image by the diffusion layer 120 and increasing the brightness of the lens film 130 and the polarizing film 140.
Here, the diffusion layer can be formed by fine irregularities, the applied diffusion agent 120b, and the diffusion film 120. The lens layer can be formed by the lens film 130. The polarizing layer can be formed by the polarizing film 140, and the polarization transmission axis is aligned with the polarization transmission axis of the polarizing filter on the backlight side (light incident side) of the liquid crystal panel body 102.

  12A, 12B, 12C, and 12D, there is a diffusion layer 120 (120b) immediately below the backlight B side of the liquid crystal panel main body 102, a lens layer 130 below it, and a polarized light below it. The case where there is a layer 140 is shown.

12 (a) and 12 (b) show the case where the diffusive surface (the fine uneven surface, the surface of the applied diffusing agent, the surface of the diffusing agent 120b of the diffusing film 120) faces the backlight B side. Show. Specifically, the surface of the diffusion agent 120b of the diffusion film 120 is directed downward.
12A shows the lens surface 130a of the lens film 130 facing upward, and the lens film 130 is partially attached to the diffusion layer 120. FIG. The polarizing film 140 may be affixed to the entire surface or may be affixed partially.
FIG. 12B shows the lens film 130 with the lens surface 130 a facing downward, and the lens film 130 is partially attached to the diffusion layer 120. The longitudinal direction of the ridges of the lens film 130 is parallel to the longitudinal direction of the light source 4. Further, the polarizing film 140 is also partially attached.

FIGS. 12C and 12D show the case where the diffusive surface faces the liquid crystal panel main body 102 side. Specifically, the surface of the diffusion agent 120b of the diffusion film 120 is directed upward. The diffusion film 120 is partially attached to the liquid crystal panel main body 102.
FIG. 12C shows the lens film 130 with the lens surface 130 a facing upward, and the lens film 130 is partially attached to the diffusion film 120. The polarizing film 140 may be affixed to the entire surface or may be affixed partially.
FIG. 12D shows the lens film 130 with the lens surface 130a facing downward. The attachment of the lens film 130 may be complete or partial. The lens layer may be integrally formed directly on the surface of the diffusion film 120 on the backlight B side instead of the lens film 130.
12C and 12D, the longitudinal direction of the convex line of the lens layer 130 is parallel to the longitudinal direction of the light source 4. Further, the polarizing film 140 is also partially attached.

  13A, 13B, 13C, and 13D, there is a diffusion layer 120 (120b) immediately below the backlight B side of the liquid crystal panel main body 102, a polarizing layer 140 below it, and a lens below it. The case where there is a layer 130 is shown.

FIGS. 13A and 13B show the case where the diffusive surface (the fine uneven surface, the surface of the applied diffusing agent, the surface of the diffusing agent 120b of the diffusing film 120) faces the backlight B side. Show. Specifically, the surface of the diffusion agent 120b of the diffusion film 120 is directed downward.
When the lens surface 130a of the lens film 130 is upward as shown in FIG. 13A, the polarizing film 140 and the lens film 130 are partially attached.
As shown in FIG. 13B, when the lens surface 130 a of the lens film 130 faces downward, the longitudinal direction of the ridge is aligned with the longitudinal direction of the light source 4. The lens film 130 may be partially attached to the polarizing film 140, but may be attached to the entire surface. Further, the lens layer may be formed by integrally forming the lens surface 130a on the surface of the polarizing film 140 on the backlight B side.

FIGS. 13C and 13D show the case where the diffusive surface faces the liquid crystal panel main body 102 side. Specifically, the surface of the diffusion agent 120b of the diffusion film 120 is directed upward. The diffusion film 120 is partially attached to the liquid crystal panel main body 102. The polarizing film 140 may be affixed to the entire surface of the diffusion film 120 or may be affixed partially. Further, a polarizing layer may be integrally formed on the surface of the diffusion film 120 on the backlight B side.
As illustrated in FIG. 13C, when the lens surface 130 a of the lens film 130 is upward, the lens film 130 is partially attached to the polarizing film 140.
As shown in FIG. 13D, when the lens surface 130 a of the lens film 130 faces downward, the longitudinal direction of the ridge is aligned with the longitudinal direction of the light source 4. The lens film 130 may be affixed to the polarizing film 140 or may be affixed partially. The polarizing film 140 can be attached to the entire surface of the diffusion film 120. Further, the polarizing layer may be integrally formed with the diffusion film 120. The lens film 140 can also be attached to the entire surface of the polarizing film 140. Further, a polarizing layer and a lens layer may be integrally formed on the diffusion film 120.

  14A, 14B, 14C, and 14D, there is a polarizing layer 140 immediately below the backlight B side of the liquid crystal panel main body 102, a diffusion layer 120 below it, and a lens layer 130 below it. It shows a case.

When the lens surface 130a of the lens film 130 constituting the lens layer is upward as shown in FIGS. 14A and 14B, the lens film 130 is partially attached to the diffusion film 120 constituting the diffusion layer. .
As shown in FIG. 14A, when the surface of the diffusion film 120 to which the diffusing agent 120b is applied is turned downward, the diffusion film 120 is attached to the entire surface of the polarizing film 140 constituting the diffusion polarizing layer. be able to.
As shown in FIG. 14B, when the surface of the diffusion film 120 to which the diffusing agent 120 b is applied is turned upward, the diffusion film 120 may be partially attached to the polarizing film 140.

When the lens surface 130 a of the lens film faces downward as shown in FIGS. 14C and 14D, the longitudinal direction of the ridges of the lens film 130 is matched with the longitudinal direction of the light source 4.
When the surface on which the diffusing agent 120 b is applied is turned downward as shown in FIG. 14C, the lens film 130 is partially attached to the diffusing film 120.
As shown in FIG. 14D, when the surface on which the diffusing agent 120b is applied is turned upward, the lens film 130 and the diffusing film 130 can be attached to the entire surface.

FIGS. 15A and 15B show a case where the polarizing layer 140 is immediately below the backlight B side of the liquid crystal panel main body 102, the lens layer 130 is below it, and the diffusion layer 120 is further below it. . The polarizing film 140 constituting the polarizing layer may be partially attached to the liquid crystal panel main body 102 or may be attached to the entire surface as shown.
FIG. 15A shows a case where the lens surface 130a of the lens film 130 is facing upward. The lens film 130 is partially attached to the polarizing layer 140. The diffusion film 120 constituting the diffusion layer can be attached to the entire surface of the lens film 130, but may be partially attached. In the case of partial pasting, the surface on which the diffusing agent 120b of the diffusing film 120 is applied may be either upper or lower. Alternatively, the diffusion layer can be formed by directly applying the diffusing agent 120b to the surface of the lens film 130 on the backlight B side.
FIG. 15B shows a case where the lens surface 130a of the lens film 130 is facing downward. The diffusion film 120 is partially attached to the lens film 130. For partial pasting, the surface of the diffusion film 120 on which the diffusing agent 120b is applied may be either upper or lower. The longitudinal direction of the ridges of the lens film 130 is aligned with the longitudinal direction of the light source 4.

In FIGS. 16A, 16B, 16C, and 16D, a lens layer 130 is provided immediately below the backlight B side of the liquid crystal panel body 102, a polarizing layer 140 is provided below the lens layer 130, and a diffusion layer 120 is further provided therebelow. It shows a case.
When the lens surface 130a of the lens film 130 constituting the lens layer is upward as shown in FIGS. 16A and 16B, the lens film 130 is partially attached to the liquid crystal panel main body 120. The polarizing film 140 constituting the polarizing layer 140 can be attached to the entire surface of the lens film 130.
As shown in FIG. 16A, when the surface of the diffusion film 120 to which the diffusing agent 120 b is applied is down, the diffusion film 120 can be attached to the entire surface of the polarizing film 140.
As shown in FIG. 16B, when the surface of the diffusion film 120 to which the diffusing agent 120 b is applied is turned up, the diffusion film 120 is partially attached to the polarizing film 140.
Instead of the diffusion film 120, the diffusion layer may be formed by directly applying the diffusion agent 120b to the polarizing film 140.

When the lens surface 130a of the lens layer 130 faces downward as shown in FIGS. 16C and 16D, the lens film 130 constituting the lens layer can be attached to the liquid crystal panel main body 120 entirely or partially. The lens layer may be formed by directly carving the prism surface on the liquid crystal panel main body 102 (the substrate 7 or the like). Note that the longitudinal direction of the ridges of the lens layer is aligned with the longitudinal direction of the light source 4.
When the surface of the diffusion film 120 to which the diffusing agent 120b is applied is down as shown in FIG. 16C, the diffusion film 120 can be attached to the polarizing film 140 on the entire surface.
When the surface on which the diffusing agent 120 b of the diffusing film 120 is applied as shown in FIG. 16D, the diffusing film 120 is partially attached to the polarizing film 140.
Instead of the diffusion film 120, the diffusion layer may be formed by directly applying the diffusion agent 120b to the polarizing film 140.

17A, 17B, 17C, and 17D, the lens layer 130 is immediately below the backlight B side of the liquid crystal panel main body 102, the diffusion layer 120 is below it, and the polarizing layer 140 is further below it. It shows a case.
When the lens surface 130a of the lens film 130 constituting the lens layer is upward as shown in FIGS. 17A and 17B, the diffusing agent 120b of the diffusion film 120 constituting the diffusion layer as shown in FIG. If the coated surface faces upward, the entire surface of the diffusion film 120 and the polarizing film 140 can be attached.
Moreover, when the surface of the diffusing agent 120b faces downward as shown in FIG. 17B, the diffusion film 120 and the polarizing film 140 may be partially attached.

As shown in FIGS. 17C and 17D, when the lens surface 130a of the lens layer 130 faces downward, the lens film 130 constituting the lens layer can be attached to the liquid crystal panel main body 120 entirely or partially. The lens layer may be formed by directly carving the prism surface on the liquid crystal panel main body 102 (the substrate 7 or the like). Note that the longitudinal direction of the ridges of the lens layer is aligned with the longitudinal direction of the light source 4.
If the surface of the diffusion film 120 constituting the diffusion layer on which the diffusing agent 120b is applied is directed upward as shown in FIG. 17C, the entire surface of the diffusion film 120 and the polarizing film 140 can be attached.
As shown in FIG. 17D, when the surface of the diffusing agent 120b is directed downward, the diffusion film 120 and the polarizing film 140 may be partially attached.

FIG. 18 shows a liquid crystal panel according to the ninth embodiment. The liquid crystal panel includes a liquid crystal panel main body 102, optical films 120, 130, and 140 such as diffusion films, and a package sheet 150 as a film holding member that is coupled to the liquid crystal panel main body 102 so as to hold the optical film. Yes.
The package sheet 150 includes one or more optical films 120, 130, and 140 stacked on the surface of the backlight B of the liquid crystal panel body 102, and the non-screen of the liquid crystal panel body 102 so as to cover the optical films 120, 130, and 140. The region 120b is affixed with an adhesive or the like.
The package sheet 150 may be attached to all sides of the non-screen region 120b having four sides, or may be attached to the non-screen region 120b having three or two sides.
Note that the optical films 120, 130, and 140 are formed smaller than the package sheet 150 so that the lowermost package sheet 150 can be attached to the non-screen region 102 b of the liquid crystal panel main body 102.

Since the optical film held by the package sheet 150 does not need to be attached to the liquid crystal panel main body 102 or another optical film, an attaching step is unnecessary, which is advantageous when the number of optical films increases. is there.
In addition, when the optical film is held by the package sheet 150, the optical film does not have to be partially attached, so that it is possible to avoid the occurrence of thermal shrinkage and bending when the optical film is partially attached.
Although it is preferable to use a transparent sheet as the package sheet 150, films 120, 130, and 140 having functions as an optical film such as a diffusing function may be used as the package sheet 150.

FIG. 19 shows a tenth embodiment. This liquid crystal panel is engaged as a liquid crystal panel main body 102, optical films 120, 130, 140 such as diffusion films, and a film holding member that is coupled to the liquid crystal panel main body 102 so as to be engaged with and held by the optical film. Part 160 is provided.
The engaging portion 160 is attached to the non-screen region 102b at the peripheral edge of the liquid crystal panel main body 102 by an adhesive or the like, and is attached to the non-screen region 102b and extends to the backlight B side, and a base portion And an engaging claw 160b extending from the front end of 160a toward the center of the liquid crystal panel. The engaging portion 160 holds the optical claw 160b so that the optical film does not fall off due to the engaging claw 160b being caught by the peripheral portions of the optical films 120, 130, and 140.
The engaging portion 160 may be provided on all sides of the non-screen region 102b having four sides, or may be three sides or two sides. If the engaging portions 160 are provided on all four sides, the optical film can be reliably held and also functions as a rib that reinforces the liquid crystal panel 102. Further, when the engaging portion 160 has three sides or two sides, the optical film can be easily attached to the engaging portion 160.

  By holding the engaging portion 160 and the optical film in an engaged state without fixing them with an adhesive or the like, problems of thermal shrinkage and bending of the optical film can be avoided. Moreover, although the engaging part 160 and the optical film may be fixed with an adhesive or the like, it is preferable that only one side of the liquid crystal panel is used in order to avoid the problems of thermal shrinkage and bending of the optical film.

  In the ninth and tenth embodiments, as the combination of optical films, all the combinations described above and other combinations are possible. A plurality of diffusion films 120, lens films 130, and polarizing films 140 may be used. For example, the lens film 130 can be preferably stacked up to two sheets, and the diffusion film 140 is preferably stacked up to three sheets.

  The invention according to each claim of the present application is not limited to the above embodiment. The invention according to each claim can be variously modified within the scope of the matters described in each claim.

It is sectional drawing of a liquid crystal display device. It is sectional drawing of a liquid crystal panel. It is sectional drawing of a light diffusable board | substrate. It is sectional drawing of the liquid crystal display device which concerns on a reference example and 2nd Embodiment. It is a top view of a liquid crystal panel main body. It is sectional drawing of the liquid crystal panel which concerns on 3rd Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 3rd Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 4th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 5th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 6th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 7th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the other liquid crystal panel which concerns on 8th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 9th Embodiment. It is sectional drawing of the liquid crystal panel which concerns on 10th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal panel 4 Light source (lamp)
6 Liquid crystal 7 Substrate (Backlight side)
7a Substrate inner surface 7b Substrate outer surface 8 Substrate 71 Diffusing agent (light diffusion layer)
102 LCD panel body 120 Diffusion film 130 Lens film (brightness enhancement layer)
140 Polarizing film (brightness enhancement layer)
150 Package sheet (film holding member)
160 engaging portion (film holding member)
B Backlight

Claims (11)

A direct type backlight in which a support part for supporting a liquid crystal panel is formed on the upper side of a lamp case having a plurality of light sources inside;
A liquid crystal panel placed on the support so as to close the upper surface opening of the lamp case, and
The direct type backlight has a hollow inside of the lamp case and does not include a diffusion plate supported by the lamp case for diffusing light of the light source, and the liquid crystal panel is directly connected to the light source. The light source is configured to be directly irradiated on the liquid crystal panel from behind the liquid crystal panel.
The liquid crystal panel has a liquid crystal sandwiched between opposing substrates and can form a screen. The liquid crystal panel has a rectangular screen region for forming a liquid crystal screen, and the four peripheral edges of the screen region have a frame shape. It has a liquid crystal panel body that is a non-screen area,
The liquid crystal panel body includes a diffusion film on the direct backlight side as a diffusion layer for diffusing light transmitted through the liquid crystal panel body,
The diffusion film is formed to have a diffusible surface by applying a diffusing agent on one or both sides of a transparent film substrate,
The diffusion film has a surface having the diffusibility while the surface having the diffusivity is opposed to the liquid crystal panel main body or another optical film provided on the direct- type backlight side of the liquid crystal panel main body. The diffusion film and the liquid crystal panel main body or the other optical film are partially pasted in the non-screen region of the liquid crystal panel main body so that an air layer is provided on the liquid crystal panel main body,
A liquid crystal display device configured to obtain a diffusion effect by utilizing refraction of light passing through the air layer and the diffusive surface. A direct type backlight in which a support part for supporting a liquid crystal panel is formed on the upper side of a lamp case having a plurality of light sources inside;
A liquid crystal panel placed on the support so as to close the upper surface opening of the lamp case, and
The direct type backlight has a hollow inside of the lamp case and does not include a diffusion plate supported by the lamp case for diffusing light of the light source, and the liquid crystal panel is directly connected to the light source. The light source is configured to be directly irradiated on the liquid crystal panel from behind the liquid crystal panel.
The liquid crystal panel has a liquid crystal sandwiched between opposing substrates and can form a screen. The liquid crystal panel has a rectangular screen region for forming a liquid crystal screen, and the four peripheral edges of the screen region have a frame shape. It has a liquid crystal panel body that is a non-screen area,
The liquid crystal panel body includes a diffusion layer that diffuses light transmitted through the liquid crystal panel body on the direct type backlight side, and the liquid crystal panel body includes a diffusion layer on the surface on the direct type backlight side. Also equipped with a lens film as a brightness enhancement layer to increase the brightness of the light transmitted through the liquid crystal panel,
The diffusion layer is constituted by a diffusing agent formed by coating so that an air layer exists on the surface, or fine irregularities formed so that an air layer exists on the surface, on one surface side of the film substrate. Having a diffusive surface,
The lens film has a lens surface formed on the film surface,
In the non-screen region of the liquid crystal panel body, at least one of the diffusion layer and the lens film is partially attached to the liquid crystal panel body side, so that the surface having the diffusibility of the diffusion layer is Air on both the surface of the diffusion layer and the lens surface while facing the liquid crystal panel body or another optical film provided on the direct-type backlight side of the liquid crystal panel body And a liquid crystal panel is configured to obtain a diffusion effect by utilizing refraction of light passing through the air layer and the diffusive surface of the diffusion layer, and a lens surface A liquid crystal display device characterized in that a light condensing action is secured.   The liquid crystal display device according to claim 2, wherein the diffusion layer has a total light transmittance of 30 to 70% of light from a backlight.   3. The liquid crystal display device according to claim 2, wherein the diffusion layer is provided with a light diffusibility on a substrate on the backlight side of the liquid crystal panel main body.   The substrate on the backlight side having the diffusibility is characterized in that the inner surface on the liquid crystal side is not subjected to light diffusion treatment and the outer surface is subjected to light diffusion treatment. Item 5. A liquid crystal display device according to item 4.   The liquid crystal display device according to claim 2, wherein the diffusion layer is formed by directly applying a diffusion agent to a surface of the liquid crystal panel body on the backlight side.   The liquid crystal panel includes the diffusion layer on a surface on the backlight side, and a lens layer on the backlight side surface of the liquid crystal panel as a luminance enhancement layer for increasing the luminance of light transmitted through the liquid crystal panel. The liquid crystal display device according to claim 1, further comprising a polarizing layer.   The liquid crystal display device according to claim 2, further comprising a polarizing layer as the brightness enhancement layer. A direct type backlight in which a support part for supporting a liquid crystal panel is formed on the upper side of a lamp case having a plurality of light sources inside;
A liquid crystal panel placed on the support so as to close the upper surface opening of the lamp case, and
The direct type backlight has a hollow inside of the lamp case and does not include a diffusion plate supported by the lamp case for diffusing light of the light source, and the liquid crystal panel is directly connected to the light source. The light source is configured to be directly irradiated on the liquid crystal panel from behind the liquid crystal panel.
The liquid crystal panel is
A liquid crystal panel body having a liquid crystal sandwiched between opposing substrates and capable of forming a screen,
The liquid crystal panel body includes a diffusion layer that diffuses light transmitted through the liquid crystal panel body on the direct backlight side,
The diffusion layer is
It is composed of a diffusing agent formed by coating so that an air layer exists on the surface or fine irregularities formed so that an air layer exists on the surface, and passes through the air layer and the diffusion layer. It is configured to obtain a diffusion effect using the refraction of light,
The surface of the liquid crystal panel body on the backlight side is provided with a film holding member coupled to the liquid crystal panel body,
The film holding member, wherein the optical film is disposed without being stuck on the surface of the backlight side of the liquid crystal panel body, so even without support is by the backlight does not fall off from the liquid crystal panel body, wherein A liquid crystal display device characterized by holding a surface of the optical film on the backlight side . The film holding member has a sheet peripheral edge adhered to the backlight-side peripheral edge of the liquid crystal panel main body, and an inner region of the sheet peripheral edge is non-adhered to the liquid crystal panel main body, A package sheet provided so that light from the light source of the backlight is irradiated from behind,
The liquid crystal display device according to claim 9, wherein an optical film is accommodated between the package sheet and the liquid crystal panel body. The film holding member is an engaging portion provided at a peripheral portion of the liquid crystal panel main body to engage with a peripheral portion of the optical film and hold the optical film.
The engagement portion is arranged on the liquid crystal panel center side to hold the optical film by being caught on the peripheral edge of the optical film so that the optical film does not fall off from the liquid crystal panel body even if the optical film is not supported by the backlight. The liquid crystal display device according to claim 9, further comprising an engaging claw extending to the surface.

Images