JP5157979B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device capable of displaying in a curved state.

  A flat display device represented by a conventional liquid crystal display device is used in various fields by taking advantage of light weight, thinness, and low power consumption. In recent years, a display device having a curved display screen has been demanded from the viewpoint of harmony with the vicinity of the installation position and design. In order to satisfy these requirements, it is conceivable to bend the liquid crystal panel using a thin glass substrate, but manufacturing using a glass substrate of less than 0.5 mm may cause a slight impact during the manufacturing process. On the other hand, it is not limited to cracking and chipping at the end portion, and a situation in which the whole is easily broken occurs, which causes a reduction in manufacturing yield.

  Therefore, a manufacturing method has been proposed in which a relatively thick glass substrate is first manufactured and then the outer surface of the substrate is etched and thinned (see, for example, Patent Document 1). According to this manufacturing method, the substrate can be formed thinner than 0.15 mm by etching, and the liquid crystal panel can be curved with a curvature radius of 200 mm.

  On the other hand, in a liquid crystal display device, high uniformity is required for the luminance of the display surface, and a display panel with a narrow frame is required. However, there is a problem that the uniformity of the light emitted from the light source of the backlight is lost in the peripheral part of the curved display panel, and the problem that the screen becomes dark in the peripheral part of the liquid crystal panel has occurred (the following In the description, in order to avoid complicated explanation, this phenomenon is referred to as “peripheral dimming”). As a result, the image quality may be lower than the screen of the conventional flat liquid crystal display device.

  Therefore, in the case of manufacturing a liquid crystal display device having a curved display surface, there has been an example in which a backlight unit serving as a light source has a curved surface structure as a countermeasure for such a problem (see, for example, Patent Document 2).

  In the above-described conventional liquid crystal display device, the display surface has a curved surface shape, and the backlight unit also has a curved surface shape. Therefore, there is a problem that the manufacturing process is complicated and the cost is increased.

  On the other hand, when a general backlight unit that is not curved is used as a light source, it is necessary to take measures to avoid peripheral dimming. Therefore, if the width of the fluorescent area of the backlight unit extends beyond the end of the liquid crystal panel, light from the periphery of the fluorescent area can also be used (see, for example, FIG. 8 of Patent Document 2). It seems that light can be improved. However, such a solution has a problem in that it increases the outer shape of the liquid crystal display device and further violates the demand for a narrow frame of the display device.

JP 2004-046115 A JP 2007-171681 A

  The present invention has been made to solve the above-described problems. Even when a liquid crystal panel having a curved display surface is used, the external shape of the liquid crystal display device can be reduced at low cost while maintaining high image quality. The object is to obtain a liquid crystal display device which is not enlarged.

The liquid crystal display device according to this invention includes a liquid crystal Paneruyuni' bets with a curved display surface, and a backlight unit comprising a fluorescent area of the planar shape, and a frame supporting the liquid crystal panel unit and a backlight unit, a liquid crystal panel A diffusing plate is disposed between the unit and the backlight unit, the diffusing plate is attached along the surface of the liquid crystal panel, and a first reflecting plate is provided on the inner wall surface of the frame, and the frame and the backlight unit A second reflecting plate is provided in parallel with the fluorescent area between the fluorescent area and the fluorescent area .

In the liquid crystal display device according to the present invention, the reflector that reflects the light from the backlight unit is provided in parallel with the fluorescent area between the inner wall surface of the frame and the frame and the fluorescent area. Even if the liquid crystal panel is used, the width of the fluorescent area of the backlight unit is not enlarged, the frame is not enlarged, and the liquid crystal display device is not enlarged. A liquid crystal display device capable of enlarging the viewing angle is obtained.

It is sectional drawing which shows the liquid crystal display device in Embodiment 1 of this invention. It is sectional drawing for demonstrating typically the characteristic of the liquid crystal display device of Embodiment 1 of this invention. It is sectional drawing which shows the liquid crystal display device in Embodiment 2 of this invention. It is sectional drawing for demonstrating typically the characteristic of the liquid crystal display device of Embodiment 2 of this invention. It is sectional drawing which shows the liquid crystal display device in Embodiment 3 of this invention.

Embodiment 1 FIG.
1 is a cross-sectional view showing a liquid crystal display device according to Embodiment 1 of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, what attached | subjected the same code | symbol is the same or it corresponds, This is common in the whole text of a specification.

  In FIG. 1, 101a is a color filter side transparent insulating substrate, 101b is an array side transparent insulating substrate, 102a is a color filter side polarizing plate, and 102b is an array side polarizing plate. The liquid crystal panel unit 100 is mainly composed of these components. Further, the display surface of the liquid crystal panel unit 100 is curved in a concave shape. Reference numeral 106 denotes a seal for preventing the liquid crystal from flowing out.

  First, details of the liquid crystal panel unit 100 will be described with reference to FIG. A liquid crystal layer is interposed between the color filter side transparent insulating substrate 101a and the array side transparent insulating substrate 101b, and liquid crystal is formed by a switching element (not shown) formed on the array side transparent insulating substrate. The direction of molecules is controlled, and the transmission amount of light incident from the array-side transparent insulating substrate 101b side is adjusted for each pixel.

  A diffusion plate 400 is disposed on the back surface of the liquid crystal panel unit so as to follow the curved surface shape.

  Next, the configuration of the backlight unit 200 will be described. 201 is a light guide plate, 202 is an optical sheet, 203 is a reflection sheet, and 204 is a cold cathode fluorescent tube. Reference numeral 205 denotes a frame for holding them. The backlight unit 200 is configured by components indicated by reference numerals 201 to 205. The light emitted from the cold cathode fluorescent tube 204 is repeatedly reflected and diffused in the light guide plate 201 and guided to the main surface (liquid crystal panel unit side) of the light guide plate. That is, the light guide plate 201 has a function of converting from a light source on a line to a surface light source. The reflection sheet 203 is installed to reflect light to the opposite main surface side (liquid crystal panel unit side). The optical sheet 202 has a function of suppressing the diffusion of light emitted from the main surface of the light guide plate and efficiently guiding it to the liquid crystal panel unit.

  Further, the liquid crystal panel unit 100 and the backlight unit 200 are fixed together by a bezel 300 that is a frame body to constitute a liquid crystal display device.

Next, features of the present embodiment will be described with reference to FIG.
The light emitted from the fluorescent area 901 of the backlight unit 200 enters the diffusion plate 400 and is diffused in various directions toward the liquid crystal panel. Accordingly, not only the bright line 952 from the end of the backlight unit 200 but also the light from the inside of the backlight unit 200 reaches the end of the liquid crystal panel unit 100 via the diffusion plate 400. . For this reason, peripheral dimming is mitigated. In FIG. 2, a display area where an image of the liquid crystal panel appears is shown as a display surface area 900.

  Further, the bright line 952 emitted from the end of the fluorescent area 901 of the backlight unit 200 is incident on the corner 950 of the liquid crystal panel unit 100 (a region surrounded by a broken line in FIG. 2), and the diffusion plate 400 and the liquid crystal The diffused light 953 is diffused in various directions through the panel unit 100. Therefore, the diffused light 953 can be recognized even at a position 902b where the observer's line-of-sight position moves further in the horizontal direction from the center position 902a of the display surface. That is, it is possible to suppress peripheral dimming even at the edge of the field of view.

  In the manufacturing method of the present invention, after attaching the diffusion plate 400 to the liquid crystal panel unit 100, the liquid crystal panel unit 100 and the backlight unit 200 may be assembled on the bezel 300, and the process is comparable to that of the conventional product. It can be manufactured by quantity. Furthermore, it is not necessary to use a backlight unit having a special structure with a curved surface.

  Therefore, even when a curved liquid crystal panel is used, the width of the fluorescent area of the backlight unit is not enlarged, the frame is not enlarged, and the external shape of the liquid crystal display device is not enlarged. It is possible to obtain a liquid crystal display device capable of reducing unevenness and widening the viewing angle.

  In the case where the liquid crystal panel unit 100 and the diffusing plate 400 are bonded to each other, it is more effective if the end portion of the diffusing plate 400 protrudes beyond the display surface area 900 on the liquid crystal panel unit 100. Therefore, the peripheral dimming will be alleviated. That is, since the light reaching the outside of the display surface area 900 on the liquid crystal panel unit can be collected by the projecting portion of the diffusion plate 400, this light can also be used.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view illustrating the liquid crystal display device according to the second embodiment. In addition to the configuration of the liquid crystal display device described in Embodiment 1, the structure of the present embodiment is between the liquid crystal panel unit 100 and the backlight unit 200 and outside the display area of the liquid crystal panel unit 100. In this structure, a reflection diffusion plate 500 that reflects or diffuses light from the unit 200 is installed.

  The configuration is the same as that of the first embodiment except that the reflective diffusion plate 500 is installed. Therefore, in addition to the configuration unique to the present embodiment described below and the effects resulting therefrom, the same effects as in the first embodiment are also exhibited.

The effect of the present invention will be described with reference to FIG.
The light emitted from the fluorescent area 901 of the backlight unit 200 enters the diffusion plate 400 and is diffused in various directions toward the liquid crystal panel. Accordingly, not only the bright line 952 from the end of the backlight unit 200 but also the light from the inside of the backlight unit 200 reaches the end of the liquid crystal panel unit 100 via the diffusion plate 400. . For this reason, peripheral dimming is mitigated.

  Of the light emitted from the end of the fluorescent area 901 of the backlight unit, the bright line 954 that passes from the gap between the liquid crystal panel unit and the backlight unit to the end is reflected and diffused by the reflection diffusion plate 500, and diffused. The emission line 955 is incident on 400. Since the reflection diffusion plate 500 is disposed in the vicinity of the display surface area 900 on the liquid crystal panel unit, the light from the reflection diffusion plate 500 is collected on the outer peripheral portion of the diffusion plate 400. For this reason, the amount of diffused light 953 that passes through the end of the liquid crystal panel unit 100 also increases, so that it is possible to suppress peripheral dimming compared to the example shown in the first embodiment.

  Furthermore, even when a curved liquid crystal panel is used, the width of the fluorescent area of the backlight unit is not enlarged, the frame is not enlarged, and the external shape of the liquid crystal display device is not enlarged. It is possible to obtain a liquid crystal display device capable of reducing unevenness and widening the viewing angle.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing the liquid crystal display device in the third embodiment. In addition to the configuration of the liquid crystal display device shown in Embodiment 1, the structure of the present embodiment is the outside of the display surface area 900 of the liquid crystal panel unit, and the reflection diffusion plate 501 is attached to the inner wall surface of the bezel 300. In this structure, the reflection diffusion plate 502 is attached to the surface of the frame 205 of the backlight unit.

  The configuration is the same as that of the first embodiment except that the reflection diffusion plates 501 and 502 are provided. Therefore, in addition to the configuration unique to the present embodiment described below and the effects resulting therefrom, the same effects as in the first embodiment are also exhibited.

  The light emitted from the fluorescent area 901 of the backlight unit 200 enters the diffusion plate 400 and is diffused in various directions toward the liquid crystal panel. Accordingly, not only the bright line 952 from the end of the backlight unit 200 but also the light from the inside of the backlight unit 200 reaches the end of the liquid crystal panel unit 100 via the diffusion plate 400. . For this reason, peripheral dimming is mitigated.

  Further, out of the light emitted from the end of the fluorescent area 901 of the backlight unit, the light traveling toward the outside of the liquid crystal panel unit is reflected and diffused by the reflection diffusion plates 501 and 502, and the bright line incident on the diffusion plate 400. Become. Since the reflection diffusion plates 501 and 502 are disposed in the vicinity of the display surface area 900 on the liquid crystal panel unit, the light from the reflection diffusion plates 501 and 502 is collected on the outer peripheral portion of the diffusion plate 400. Therefore, the amount of diffused light 953 that passes through the end portion of the liquid crystal panel unit 100 also increases, so that it is possible to suppress peripheral dimming as in the example shown in the second embodiment.

  Even if a liquid crystal panel in a curved state is used, the luminance of the backlight unit's fluorescent area is not enlarged, the frame is not enlarged, and the liquid crystal display device is not enlarged. It is possible to obtain a liquid crystal display device capable of reducing unevenness and widening the viewing angle.

  In the first to third embodiments described above, only the liquid crystal display device curved in a concave shape is given as an example, but even in a liquid crystal display device curved in a convex shape, if a diffusion plate is arranged along a curved surface, incident light is displayed on the display surface. Since it is scattered immediately before, the peripheral dimming is mitigated, so that the effect of improving the image quality can be obtained.

  It should be understood that the above-described embodiment is illustrative in all respects and not restrictive. The scope of the present invention is shown not by the scope of the above-described embodiment but by the scope of the claims, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

  100 liquid crystal panel unit, 101a color filter side transparent insulating substrate, 101b array side transparent insulating substrate, 102a color filter side polarizing plate, 102b array side polarizing plate, 106 seal, 200 backlight unit, 201 light guide plate, 202 optical Sheet, 203 Reflective sheet, 204 Cold cathode fluorescent tube, 205 frame, 300 bezel, 400 Diffuser installed along the curved surface shape, 500 Reflective diffuser, 501 Reflective diffuser attached to the inner wall surface of bezel 300, 502 Back Reflective diffuser pasted on the surface of the frame 205 of the light unit, 900 display surface area on the liquid crystal panel unit, 901 fluorescent area of the backlight unit, 902a observer's line of sight, 902b observer's line of sight, 950 liquid crystal panel unit of 951, bright line generated from the fluorescent area, 952 bright line incident on the corner 950, 953 diffused light diffused in the direction of the liquid crystal panel by the diffusion plate 400, 954 exiting from the gap between the liquid crystal panel unit and the backlight unit to the end Bright line, 955 Bright line incident on the diffusion plate 400, 956 Bright line reflected and passing through the gap between the liquid crystal panel unit and the backlight unit, and 957 Bright line incident on the diffuser plate 400.

Claims (1)

A liquid crystal panel unit having a curved display surface;
A backlight unit having a planar fluorescent area ;
In a liquid crystal display device having a frame that supports the liquid crystal panel unit and the backlight unit,
A diffusion plate is disposed between the liquid crystal panel unit and the backlight unit,
The diffusion plate is attached along the surface of the liquid crystal panel ,
A first reflector is provided on the inner wall surface of the frame;
A liquid crystal display device , wherein a second reflecting plate is provided in parallel with the fluorescent area between the frame and the fluorescent area of the backlight unit .

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