JP5287415B2 - Backlit LCD module - Google Patents

Description

  The present invention relates to a liquid crystal module with a backlight.

  Conventionally, a liquid crystal module with a backlight is known in which a liquid crystal panel is covered with a pair of shield cases (see, for example, Patent Document 1). Specifically, as shown in FIGS. 6 and 7, the conventional liquid crystal module 100 is provided on each of the outer surfaces on the opposite side of the pair of transparent substrates 123, 124 and the transparent substrates 123, 124 facing each other. It has a liquid crystal panel 101 including polarizing plates 15, 16, a back shield case 102 that covers the back side of the liquid crystal panel 101, and a front shield case 103 that covers the periphery of the front side of the liquid crystal panel 101. The liquid crystal panel 101 is mounted on the back shield case 102 with a double-sided tape 104. The front shield case 103 is assembled by engaging the rear shield case 102.

  By the way, when shipped from the factory, the liquid crystal module 100 may be shipped. However, depending on the user's request, the liquid crystal module 100 and the backlight 200 are assembled and shipped in a so-called liquid crystal monitor. There is also. For example, as shown in FIG. 8, a backlight 200 mounted on a conventional liquid crystal monitor includes a reflection sheet 202, a light guide plate 203, a light source substrate 204, a plurality of optical sheets 205, an inner frame in a light shielding case 201. 206 and a light shielding sheet 207 are accommodated. Then, as shown in FIG. 9, the liquid crystal monitor 300 is assembled by installing the liquid crystal module 100 on the backlight 200 and fixing it with a fixture (not shown). After the assembly, the light shielding sheet 206 fills the gap between the liquid crystal module 100 and the backlight 200, thereby preventing the entry of external light.

JP 2008-76918 A

In the liquid crystal module and the liquid crystal monitor, it is desired to reduce the number of parts as in other electronic devices.
An object of the present invention is to provide a liquid crystal module with a backlight that can reduce the number of components.

In order to solve the above problems, according to one aspect of the present invention,
A pair of transparent substrates disposed on the front side and the back side, a front side polarizing plate attached to the surface of the transparent substrate on the front side of the pair of transparent substrates, and the back side of the pair of transparent substrates A liquid crystal panel that includes a back side polarizing plate attached to the back side of the transparent substrate on the side , and that displays toward the front side by light emitted from a backlight disposed on the back side;
A wall portion provided so as to surround the periphery of the liquid crystal panel; and an end portion on the surface side of the wall portion that protrudes from the wall portion toward the side where the liquid crystal panel is disposed ; A frame-shaped member having a top plate portion provided with an opening in which a surface-side polarizing plate is disposed inside ;
A base material disposed so as to expose a display region of the liquid crystal panel from the back surface of the liquid crystal panel to the back surface of the wall portion of the frame-shaped member;
Between the base material and the liquid crystal panel and the frame-like member, it is arranged so as to expose the display area of the liquid crystal panel from the back surface of the liquid crystal panel to the back surface of the frame-like member, and the base material And a first adhesive layer that fixes the base material, the liquid crystal panel, and the frame-shaped member by being attached to the back surface of the liquid crystal panel and the back surface of the frame-shaped member. A liquid crystal module with light is provided.

In the above-mentioned liquid crystal module with a backlight, preferably, the substrate has a light shielding property.
In the backlight-equipped liquid crystal module, preferably, the first adhesive layer is attached to the outer surface of the transparent substrate on the rear surface side of the rear surface of the liquid crystal panel.
The backlight-equipped liquid crystal module preferably further includes a second adhesive layer attached to a surface of the substrate opposite to the side on which the liquid crystal panel and the frame-shaped member are disposed.
In the above-mentioned liquid crystal module with a backlight, preferably, it further has a backlight disposed on the back side of the liquid crystal panel,
The backlight includes a reflection sheet, a light guide plate disposed on the surface side of the reflection sheet, an optical sheet disposed on the surface side of the light guide plate, and a light source disposed on the side of the light guide plate, and A light source member that emits light from a light source toward the liquid crystal panel, and a second frame-like member that is provided so as to accommodate the light source member inside and has a thickness in the thickness direction of the light guide plate. Including
Wherein the second adhesive layer, the disposed from the surface of the surface side of the optical sheet toward the surface of the surface side of the second frame member, and the upper surface and the second frame member of said light source member of said light source member The liquid crystal panel, the frame-shaped member, the light source member, and the second frame-shaped member are fixed via the base material.
In the backlight-equipped liquid crystal module, preferably, the upper surface of the second frame member and the upper surface of the light source member are flush with each other.
In the above-mentioned liquid crystal module with a backlight, preferably, the liquid crystal module further includes a peelable layer laminated on the back surface side of the second adhesive layer.
In the backlight-equipped liquid crystal module, preferably, the base material has a rectangular frame shape having an opening, and the release layer has a rectangular shape having the same size as the base material.
In the backlight-equipped liquid crystal module, preferably, the back surface of the frame-shaped member and the back surface of the liquid crystal panel are flush with each other.
In the backlight-equipped liquid crystal module, preferably, the inner end portion of the base material extends inward from the first adhesive layer.
In the above-described liquid crystal module with a backlight, preferably, the base material has a rigidity that does not shift a positional relationship between the liquid crystal panel and the frame-shaped member in the thickness direction.

  According to the present invention, the double-sided tape is disposed from the liquid crystal panel to the resin frame, and the double-sided tape is attached to the liquid crystal panel and the resin frame so that the liquid crystal panel and the resin frame are assembled. Thus, the liquid crystal panel and the resin frame can be held. As a result, it is possible to omit the lower shield case that has been conventionally required, and to reduce the number of parts.

It is a disassembled perspective view which shows schematic structure of the liquid crystal module of this embodiment. It is sectional drawing which showed typically the cross-sectional structure along the II-II cutting line of FIG. It is a disassembled perspective view which shows schematic structure of the backlight of this embodiment. It is sectional drawing which showed typically the state which assembled | attached the liquid crystal module of FIG. 1, and the backlight of FIG. It is sectional drawing which shows the modification of FIG. It is a disassembled perspective view which shows schematic structure of the conventional liquid crystal module. It is sectional drawing which showed typically the cross-sectional structure along the VII-VII cutting line of FIG. It is a disassembled perspective view which shows schematic structure of the conventional backlight. It is sectional drawing which showed typically the state which assembled | attached the liquid crystal module of FIG. 6, and the backlight of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is an exploded perspective view showing a schematic configuration of the liquid crystal module 1 of the present embodiment, and FIG. 2 is a cross-sectional view schematically showing a cross-sectional configuration along the II-II cutting line of FIG. As shown in FIGS. 1 and 2, the liquid crystal module 1 includes a liquid crystal panel 2, a resin frame 3, and a double-sided tape 4.

  The liquid crystal panel 2 includes an observation side and a pair of transparent substrates 23 and 24 arranged opposite to each other with a predetermined gap, and a liquid crystal layer (not shown) sealed in the gap between the transparent substrates 23 and 24. ), And a plurality of pixels for controlling light transmission by changing the alignment state of the liquid crystal molecules of the liquid crystal layer by applying a voltage, respectively, on the mutually facing inner surfaces of the pair of transparent substrates 23 and 24. The first and second transparent electrodes (not shown), the polarizing plate 5 attached to the outer surface of the transparent substrate 23 on the observation side (front side), and the outer surface of the transparent substrate 24 on the opposite side (back side) The polarizing plate 6 is provided.

The resin frame 3 has a substantially rectangular frame-shaped wall portion 32 at the peripheral portion, and the end of the liquid crystal panel 2 on the surface side of the wall portion 32 is inside from the wall portion 32 (the liquid crystal panel with respect to the resin frame 2). The top plate portion 31 is formed so as to protrude toward the side on which the liquid crystal panel 2 is disposed, so that a substantially rectangular opening smaller than the liquid crystal panel 2 is formed in a substantially central portion on the surface side of the liquid crystal panel 2 in the resin frame 3. 33 is defined. Then, the polarizing plate 5 attached so as to include the display area of the liquid crystal panel 2 is disposed in the opening 33 of the resin frame 3, and the back surface 311 of the top plate portion 31 (the liquid crystal panel 2 of the resin frame 2). The liquid crystal panel 2 is disposed in the resin frame 3 so that the surface facing the substrate) and the substrate of the liquid crystal panel 2 come into contact with each other. That is, the periphery of the surface side of the liquid crystal panel 2 is covered with the top plate portion 31, and the side of the liquid crystal panel 2 is covered with the wall portion 32. Here, when the resin frame 3 is assembled to the liquid crystal panel 2 and the back surface 311 of the top plate portion 31 and the front surface 21 of the liquid crystal panel 2 contact each other, the back surface 321 of the wall portion 32 and the back surface 22 of the liquid crystal panel 2 The height h1 of the wall portion 32 and the thickness h2 of the liquid crystal panel 2 are set so that are substantially flush.
In addition, since the resin frame 3 becomes difficult to be charged by performing metal plating on the surface of the resin frame 3, it is possible to suppress an adverse effect due to static electricity.

  The double-sided tape 4 is disposed from the back surface 22 of the liquid crystal panel 2 that is substantially flush with each other to the back surface 321 of the wall portion 32 of the resin frame 3, and is adhered to the back surfaces 22 and 321 respectively. And the resin frame 3 are assembled. An opening 45 is formed in the double-sided tape 4, and a polarizing plate 6 attached so as to overlap the entire display area of the liquid crystal panel 2 is disposed in the opening 45.

As shown in FIG. 2, the double-sided tape 4 includes a first adhesive layer 41, a base material 42, a second adhesive layer 43, and a release layer 44.
The first adhesive layer 41 is a layer attached to the outer surface of the opposite transparent substrate 24 on the back surface 22 of the liquid crystal panel 2 and the back surface 321 of the resin frame 3.
The base material 42 has the first adhesive layer 41 laminated on the front surface and the second adhesive layer 43 laminated on the back surface, and holds the first adhesive layer 41 and the second adhesive layer 43. The base material 42 is made of, for example, PET, resin, or the like, and has such a rigidity that the liquid crystal panel 2 and the resin frame 3 are not displaced from each other along the thickness direction. Moreover, the base material 42 is formed of a member having a light shielding property.
The release layer 44 is, for example, paper or a resin sheet, and is laminated on the back surface side of the second adhesive layer 43 so as to be peelable. The release layer 44 has the same size as that of the double-sided tape 4 and has a rectangular shape having no opening. Since the release layer 44 does not have an opening in the opening 45 of the double-sided tape 4, in the state where the release layer 44 is attached to the liquid crystal module 1, the polarized light attached to the opposite transparent substrate 24 and the outer surface thereof. Since the plate 6 is not exposed to the outside, it is possible to prevent the surface of the opposite transparent substrate 24 and the polarizing plate 6 from being damaged during the handling and causing the liquid crystal module 1 to be defective.

  Next, the backlight 50 to which the liquid crystal module 1 is assembled will be described. FIG. 3 is an exploded perspective view showing a schematic configuration of the backlight 50, and FIG. 4 is a cross-sectional view schematically showing a state in which the liquid crystal module 1 and the backlight 50 are assembled.

  As shown in FIGS. 3 and 4, the backlight 50 includes a reflective sheet 52, a light guide plate 53, a light source substrate 54, a plurality of optical sheets 55, and an inner frame 56 in a light shielding case 51. The reflection sheet 52, the light guide plate 53, the light source substrate 54, and the plurality of optical sheets 55 are referred to as light source members. The light shield case 51 is a metal casing, and has a notch 511 on one side of which a part of the light source substrate 54 is drawn. The reflection sheet 52 is installed on the bottom surface of the light shielding case 51. The light guide plate 53 is installed on the reflection sheet 52, and a recess 531 is formed on one side thereof. The light source substrate 54 is installed on one side of the light guide plate 53. For example, an LED 541 is mounted on the light source substrate 54 as a light source, and the LED 541 is disposed in the recess 531 of the light guide plate 53. The plurality of optical sheets 55 are disposed on the light guide plate 53. The inner frame 56 is formed in a substantially U shape when viewed from above, and is installed in the light shielding case 51 so as to surround the periphery of the reflection sheet 52, the light guide plate 53, and a plurality of optical sheets 55. ing. The height of the inner frame 56 is set so that the upper surface 561 thereof is substantially flush with the upper surface 551 of the uppermost optical sheet 55.

  When the liquid crystal module 1 is assembled to the backlight 50, the peeling layer 44 is first peeled off from the liquid crystal module 1. Thereafter, the exposed second adhesive layer 43 is disposed from the upper surface 561 of the inner frame 56, which is substantially flush with each other, to the upper surface 551 of the uppermost optical sheet 55, and is affixed to each of the upper surfaces 561, 551. As shown, the liquid crystal module 1 and the backlight 50 are aligned and assembled (see FIG. 4).

  As described above, according to the liquid crystal module 1 of the present embodiment, the first adhesive layer 41 of the double-sided tape 4 is arranged from the liquid crystal panel 2 to the resin frame 3, and the first adhesive layer 41 of the double-sided tape 4 is placed on the liquid crystal panel. Since the liquid crystal panel 2 and the resin frame 3 are assembled by being attached to the resin frame 3 and the resin frame 3, the liquid crystal panel 2 and the resin frame 3 can be held only by the double-sided tape 4. Accordingly, the lower shield case that has been necessary after the liquid crystal panel 2 and the backlight 50 are assembled can be omitted from the liquid crystal module 1 before the assembly with the backlight 50, and the number of parts can be reduced. It becomes possible to plan.

  Further, since the back surface 321 of the wall portion 32 and the back surface 22 of the liquid crystal panel 2 are substantially flush with each other, there is almost no step between the back surface 321 of the wall portion 32 and the back surface 22 of the crystal panel 2. The wall portion 32 and the crystal panel 2 can be more firmly fixed by the one adhesive layer 41.

  And if the base material 42 of the double-sided tape 4 has a light shielding property, when the backlight 50 is assembled to the liquid crystal module 1, the double-sided tape 4 functions as a light shielding sheet. For this reason, it is possible to omit the light shielding sheet on the backlight side, which has been necessary in the past, and the number of parts can be further reduced.

  Further, since the base material 42 of the double-sided tape 4 has such a rigidity that the liquid crystal panel 2 and the resin frame 3 are not displaced in the thickness direction, the assembled liquid crystal panel 2 and the resin frame 3 Can be fixed more firmly.

  Further, when the backlight 50 is assembled to the liquid crystal module 1, the peeling layer 44 of the double-sided tape 4 is peeled off to expose the second adhesive layer 43, and then the second adhesive layer 43 is attached to the liquid crystal panel 2 and the resin frame 3. Since the liquid crystal panel 2 and the resin frame 3 are assembled to each other, the second adhesive layer 43 included in the double-sided tape 4 of the liquid crystal module 1 is attached to the liquid crystal module 1 and the backlight 50. It can also serve as. Therefore, conventionally, when a separate fixing member is required to fix the backlight 50 to the liquid crystal module 1, the fixing member can be reduced.

  Since the upper surface 561 of the inner frame 56 and the upper surface 551 of the uppermost optical sheet 55 are substantially flush with each other, there is a step between the upper surface 561 of the inner frame 56 and the upper surface 551 of the uppermost optical sheet 55. Therefore, the inner frame 56 and the uppermost optical sheet 55 can be more firmly fixed by the second adhesive layer 43.

  Moreover, since the first adhesive layer 41 is adhered to the outer surface of the opposite transparent substrate 24 on the rear surface 22 of the liquid crystal panel 2, the rear surface of the polarizing plate 6 (of the opposite transparent substrate 24 of the polarizing plate 6). The liquid crystal module 1 can be made thinner as compared with the case where it is adhered to the surface opposite to the surface facing the outer surface.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.
Further, in the present embodiment, the case where only the base material 42 of the double-sided tape has light shielding properties has been described as an example, but if at least one of the first adhesive layer 41 and the second adhesive layer 43 also has light shielding properties, Higher light shielding properties can be exhibited.

In the present embodiment, the case where the first adhesive layer 41, the base material 42, and the second adhesive layer 43 of the double-sided tape 4 have the same width has been described as an example, but the base of the liquid crystal module 1A shown in FIG. Like the material 42 a, it may protrude from the first adhesive layer 41 and the second adhesive layer 43 to the inside, and the inner end 42 b may extend to the vicinity of the display area of the liquid crystal panel 2. In this case, the thickness h3 of the polarizing plate 6 is set to be smaller than the thickness h4 of the first adhesive layer 41 so that the base material 42a does not contact the polarizing plate 6 on the back surface side of the liquid crystal panel 2. As described above, when the inner end portion 42b of the base material 42a extends to the vicinity of the display area of the liquid crystal panel 2, higher light shielding properties can be exhibited.
Furthermore, the peeling layer 44 may be formed in a rectangular frame shape having the same shape as the double-sided tape 4, and the first adhesive layer 41 may be adhered to the back surface of the polarizing plate 6 on the back surface 22 of the liquid crystal panel 2.

1 liquid crystal module 2 liquid crystal panel 3 resin frame (frame-shaped member)
4 Double-sided tape 5 Polarizing plate 6 Polarizing plate 21 Front surface 22 Back surface 23 Transparent substrate on the observation side 24 Transparent substrate on the opposite side 31 Top plate portion 32 Wall portion 33 Opening 41 First adhesive layer 42 Base material 42a Base material 42b Inner end portion 43 Second adhesive layer 44 Release layer 45 Opening 50 Backlight 56 Inner frame (second frame member)
311 Back side (back side of the top plate)
321 Back side (Back side of resin frame)

Claims (11)

A pair of transparent substrates disposed on the front side and the back side, a front side polarizing plate attached to the surface of the transparent substrate on the front side of the pair of transparent substrates, and the back side of the pair of transparent substrates A liquid crystal panel that includes a back side polarizing plate attached to the back side of the transparent substrate on the side , and that displays toward the front side by light emitted from a backlight disposed on the back side;
A wall portion provided so as to surround the periphery of the liquid crystal panel; and an end portion on the surface side of the wall portion that protrudes from the wall portion toward the side where the liquid crystal panel is disposed ; A frame-shaped member having a top plate portion provided with an opening in which a surface-side polarizing plate is disposed inside ;
A base material disposed so as to expose a display region of the liquid crystal panel from the back surface of the liquid crystal panel to the back surface of the wall portion of the frame-shaped member;
Between the base material and the liquid crystal panel and the frame-like member, it is arranged so as to expose the display area of the liquid crystal panel from the back surface of the liquid crystal panel to the back surface of the frame-like member, and the base material And a first adhesive layer that fixes the base material, the liquid crystal panel, and the frame-shaped member by being attached to the back surface of the liquid crystal panel and the back surface of the frame-shaped member. LCD module with light. The backlit liquid crystal module according to claim 1,
A backlit liquid crystal module, wherein the base material has a light shielding property. In the backlit liquid crystal module according to claim 1 or 2,
The liquid crystal module with a backlight, wherein the first adhesive layer is affixed to an outer surface of the transparent substrate on the back surface side of the back surface of the liquid crystal panel. In the liquid crystal module with a backlight according to any one of claims 1 to 3,
The backlight-equipped liquid crystal module further comprising a second adhesive layer affixed to a surface of the substrate opposite to the side on which the liquid crystal panel and the frame-shaped member are disposed. The liquid crystal module with a backlight according to claim 4,
It further has a backlight arranged on the back side of the liquid crystal panel,
The backlight includes a reflection sheet, a light guide plate disposed on the surface side of the reflection sheet, an optical sheet disposed on the surface side of the light guide plate, and a light source disposed on the side of the light guide plate, and A light source member that emits light from a light source toward the liquid crystal panel, and a second frame-like member that is provided so as to accommodate the light source member inside and has a thickness in the thickness direction of the light guide plate. Including
Wherein the second adhesive layer, the disposed from the surface of the surface side of the optical sheet toward the surface of the surface side of the second frame member, and the upper surface and the second frame member of said light source member of said light source member A liquid crystal module with a backlight, wherein the liquid crystal panel, the frame-shaped member, the light source member, and the second frame-shaped member are fixed via the base material by being affixed to the upper surface of the liquid crystal panel. The liquid crystal module with a backlight according to claim 5,
The backlight-equipped liquid crystal module, wherein an upper surface of the second frame member and an upper surface of the light source member are flush with each other. The liquid crystal module with a backlight according to claim 4,
A liquid crystal module with a backlight, further comprising a peelable layer laminated on the back side of the second adhesive layer. The backlit liquid crystal module according to claim 7,
The base material has a rectangular frame shape having an opening,
The backlight-equipped liquid crystal module, wherein the release layer has a rectangular shape having the same size as the substrate. In the backlit liquid crystal module according to any one of claims 1 to 8,
A backlit liquid crystal module, wherein a back surface of the frame member and a back surface of the liquid crystal panel are flush with each other. In the backlit liquid crystal module according to any one of claims 1 to 9,
The backlight-equipped liquid crystal module, wherein an inner end portion of the base material extends inward from the first adhesive layer. In the backlit liquid crystal module according to any one of claims 1 to 10,
The backlight-equipped liquid crystal module, wherein the base material has a rigidity that does not shift a positional relationship between the liquid crystal panel and the frame-shaped member in a thickness direction.

Images