JPH11281963A - Plane display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane display device where a liquid crystal panel can be stably held in a prescribed position with respect to a back light unit and a vessel. SOLUTION: This device is provided with a back light unit 12, a liquid crystal panel 10, and a vessel 14 which are laminated and arranged. A frame 32 of the back light unit 12 is provided with a first positioning projection 34 brought into contact with a corner part of the liquid crystal panel 10 and a second positioning projection 35 which faces another corner part in the diagonal direction of the liquid crystal panel 10 with a prescribed gap between them. The vessel 14 has a pressing projection 40 formed, and this pressing projection 40 is fitted between the corner part of the liquid crystal panel 10 and the second positioning projection 35 and presses the liquid crystal panel 10 to the first positioning precision 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display.

[0002]

2. Description of the Related Art As a flat display device, for example, a liquid crystal display device provided in a portable personal computer or the like has been developed.
A backlight unit, a liquid crystal panel disposed on the backlight unit, and a frame-shaped bezel disposed on the liquid crystal panel, and configured as a flat rectangular shape as a whole. I have.

Usually, a backlight unit has a light guide plate and a prism sheet, and these are supported by a frame in a stacked state. In addition, the liquid crystal panel has an array substrate on which scanning lines, signal lines, pixel electrodes, and the like are formed, and a counter substrate on which counter electrodes are formed. I have. A plurality of side edges of the array substrate are provided with a tape carrier package (hereinafter TC).
The drive circuit board is connected to the drive circuit board via a P.

The bezel has an opening having an area smaller than that of the counter substrate, and is fitted over the liquid crystal panel and fitted around the backlight unit with the peripheral edge of the opening overlapping the peripheral edge of the counter substrate. . In the gap between the bezel and the LCD panel, and the gap between the LCD panel and the backlight unit,
Each is provided with a spacer rubber. This allows
The liquid crystal panel is held between the backlight unit and the bezel via a spacer rubber.

[0005]

However, in the liquid crystal display device having the above-described structure, since there is no reference for alignment of the liquid crystal panel with respect to the backlight unit and the bezel, the liquid crystal panel does not move with respect to these during assembly. It deviates from a predetermined position and the center of the display screen varies. In addition, such a displacement of the liquid crystal panel may cause light leakage.

Further, since the liquid crystal panel is held between the backlight unit and the bezel via the spacer rubber, the work of attaching the spacer rubber is troublesome, and the liquid crystal panel is mechanically fixed. Therefore, when a large impact acts, the liquid crystal panel may be displaced.

Usually, since the bezel is screwed to the backlight unit, the compression ratio of the spacer rubber fluctuates depending on the degree of screw tightening. Therefore, the gap between the backlight unit and the liquid crystal panel is not stable, and the brightness of the liquid crystal display device varies.

An object of the present invention is to provide a flat display device capable of stably holding a liquid crystal panel at a predetermined position with respect to a backlight unit and a bezel. .

[0009]

In order to achieve the above object, a flat display device according to the present invention comprises a substantially rectangular backlight unit having a light guide plate and a frame supporting a peripheral portion of the light guide plate. A substantially rectangular liquid crystal panel arranged on the backlight unit; and a rectangular frame-shaped bezel arranged on the liquid crystal panel and fixed to a frame of the backlight unit. ing. The frame of the backlight unit has a first positioning protrusion that determines a position of the liquid crystal panel in two directions orthogonal to each other, and a second positioning protrusion provided to face the first positioning protrusion, The bezel includes a pressing projection fitted between the second positioning projection and the liquid crystal panel and pressing the liquid crystal panel against the first positioning projection.

Further, according to the present invention, the first positioning projection is formed in an L-shape in contact with one corner of the liquid crystal panel, and the second positioning projection is formed in the corner of the liquid crystal panel. It is characterized in that it is formed in an L-shape corresponding to another angle portion diagonally separated from the portion and is provided at a position facing the other corner portion with a predetermined gap. .

According to the flat display device configured as described above, at the time of assembly, the liquid crystal panel is arranged on the backlight unit with the first positioning projection of the backlight unit as a reference, and is then put on the liquid crystal panel. Attach the bezel to the backlight unit frame. Then, the pressing protrusion provided on the bezel fits between the second positioning protrusion and the liquid crystal panel, and presses and holds the liquid crystal panel against the first positioning protrusion.

Thus, the liquid crystal panel is positioned at a predetermined position with reference to the first positioning protrusion, and is disposed at a fixed position with respect to the backlight unit and the bezel. Therefore, variation in the center of the display screen is reduced.

Further, the liquid crystal panel can be mechanically fixed by the first and second positioning projections and the pressing projections, so that the displacement of the liquid crystal panel due to an impact or the like can be prevented. At the same time, there is no need to provide spacer rubber, etc.
The assemblability can be improved, and the gap between the liquid crystal panel and the backlight unit can be made constant.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the liquid crystal display device is configured by stacking a rectangular liquid crystal panel 10, an edge light type backlight unit 12, and a rectangular frame-shaped bezel 14. It has a shape.

As shown in FIGS. 2 and 3, the liquid crystal panel 10 has a rectangular array substrate 20 and a rectangular opposing substrate 22 which is arranged opposite to the array substrate with a predetermined gap. A liquid crystal layer (not shown) is sealed between these substrates.

The array substrate 20 is formed by forming scanning lines, signal lines, pixel electrodes, and the like (not shown) on a glass substrate. The counter substrate 22 is formed by forming a not-shown counter electrode, a color filter, and the like on a glass substrate. The counter substrate 22 is formed to have a smaller area than the array substrate 20. Thereby, two orthogonal side edges of the array substrate 20 protrude from the counter substrate 22. A large number of electrodes (not shown) are formed on the upper surface of the protruding side edge. The array substrate 20
And on the outer surface of the counter substrate 22, a polarizing plate 26,
27 is attached.

The electrodes of the array substrate 20 are provided with a plurality of TCPs.
The other end of the TCP is connected to the drive circuit board 16. Thus, the array substrate 20 is connected to the drive circuit substrate 16 via the TCP 18.

On the other hand, the backlight unit 12 has a substantially rectangular light guide plate 30 and an optical sheet (not shown) such as a prism sheet provided on the surface of the light guide plate. An outer peripheral edge of the light guide plate 30 is a rectangular frame 32.
Supported by The frame is provided with a long and thin cold-cathode tube as a light source (not shown), a reflector, a protective cover, and the like.

The upper surface of the frame 32 constitutes a support surface 32a which is in contact with the peripheral portion of the liquid crystal panel 10.
a includes first, second, and third positioning projections 34, 35, and 3;
6 are integrally provided.

As shown in FIGS. 2 to 6, the first positioning projection 34 is formed in an L-shape, and has a first contact surface 34a extending in the X direction parallel to one side of the frame 32, and orthogonal to the X direction. And a second contact surface 34b extending in the Y direction. The first positioning projection 34 is provided near one corner of the frame 32.

The second positioning projection 35 is formed in an L shape, and has a first contact surface 35a extending in the X direction and a second contact surface 35b extending in the Y direction. The second positioning projection 35 is provided near the corner of the frame 32 that is located diagonally to the corner where the first positioning projection 34 is provided. Further, the third positioning projection 36 is provided near the remaining one corner of the frame 32, and has a contact surface 36a extending in the X direction.

With respect to the backlight unit 12,
The liquid crystal panel 10 is mounted on the frame with the lower peripheral edge of the array substrate 20 in contact with the support surface 32 a of the frame 32. The liquid crystal panel 10 has one corner 10a.
, The mutually orthogonal side surfaces are the first positioning projections 34.
Abut on the first and second abutment surfaces 34a and 34b, and are positioned in the X and Y directions.

In the corner 10b of the liquid crystal panel 10 which is located diagonally to the corner 10a, the side surfaces orthogonal to each other correspond to the first and second contact surfaces 35a, 35b of the second positioning projection 35. On the other hand, they face each other with a predetermined gap. Further, the remaining one corner 1 of the liquid crystal panel 10
At 0 c, the side surface of the liquid crystal panel 10 extending in the X direction is in contact with the contact surface 36 a of the third positioning projection 36.

On the other hand, as shown in FIGS. 2, 3 and 5, the bezel 14 has a rectangular upper surface wall 14a having substantially the same dimensions as the frame 32 of the backlight unit 12.
And a side wall 14b vertically erected along the periphery of the upper wall.
And is formed of a metal plate. Top wall 1
A rectangular opening 38 having a size slightly smaller than the counter substrate 22 of the liquid crystal panel 10 is formed in 4a.

In the vicinity of one corner of the upper wall 14a, a substantially L-shaped pressing projection 40 extending in the X and Y directions is formed. The pressing protrusion 40 is provided on the upper surface wall 1.
4a is formed by drawing, and protrudes from the inner surface of the upper surface wall, and has a tapered V-shaped cross section.

In the bezel 14 having the above-described structure, four corners are formed by the four screws 41 at the backlight unit 1.
The upper surface wall 14a is screwed to the second frame 32, the upper surface wall 14a is opposed to the peripheral portion of the liquid crystal panel 10, and
The side wall 14b is fitted on the outer surface of the frame 32. The pressing protrusion 40 is fitted between the second positioning protrusion 35 of the frame 32 and the side surface of the corner 10b of the liquid layer cell 10 to position the liquid crystal panel 10 in the first and third positioning protrusions 3.
4 and 36, and against the support surface 32a of the frame 32.

As a result, the positions of the liquid crystal panel 10 in the X and Y directions with respect to the first positioning projection 34 are determined, and the backlight unit 12 and the bezel 14
It is held at a predetermined position between them. Then, the counter substrate 22
Are located opposite the opening 38 of the bezel 14.

When assembling the above-described liquid crystal display device, first, the liquid crystal panel 10 is placed on the support surface 32a of the frame 32 of the backlight unit 12, and the corners 10a and 10c of the liquid crystal panel 10 are first and second. 3 Press against the positioning projections 34, 36. As a result, the liquid crystal panel 10 is positioned at a substantially predetermined position with respect to the backlight unit 12, and the corner 1
Ob faces the second positioning projection 35 with a predetermined gap.

Subsequently, the bezel 14 is put on the periphery of the liquid crystal panel 10 and the frame 32 of the backlight unit 12 is
And the pressing projection 40 of the bezel is pushed between the second positioning projection 35 and the corner 10 b of the liquid layer cell 19. Thereafter, the bezel 14 is screwed to the frame 32 with four screws 41. By tightening the screw 41, the upper surface wall 14 a of the bezel 14 approaches the frame 32, and the pressing projection 40 is further pushed between the second positioning projection 35 and the corner 10 b of the liquid layer cell 19. As a result, the liquid crystal panel 10 is pressed against the first positioning projection 34 by the pressing projection 40, and the first positioning projection 3
4 is positioned in the X and Y directions.
At the same time, the liquid crystal panel 10 is pressed against the support surface 32a of the frame 32 by the pressing protrusion 40, and faces the light guide plate 30 with a predetermined gap d. Thus, the assembly of the liquid crystal display device is completed.

According to the liquid crystal display device configured as described above, the liquid crystal panel 10 is pressed against the first and third positioning protrusions 34 and 36 of the backlight unit 12 by the pressing protrusions 40 provided on the bezel 14. By fixing, the liquid crystal panel 10 can be accurately positioned at a predetermined position based on the first positioning protrusion.
This makes it possible to obtain a liquid crystal display device with reduced display screen center variation.

Further, the liquid crystal panel 10 is divided into first, second and third liquid crystal panels.
It can be mechanically fixed by the positioning projections 34, 35, 36 and the pressing projections 40, and the displacement of the liquid crystal panel due to an impact or the like can be prevented. At the same time, it is not necessary to provide a spacer rubber or the like, so that the assemblability can be improved, and the gap between the liquid crystal panel 10 and the backlight unit 12 can be made constant.

Further, by forming the pressing projection 40 into a tapered cross section toward the backlight unit 12, the pressing projection can be easily pushed into the gap between the second positioning projection 35 and the liquid crystal panel 10, and (1) The liquid crystal panel can be reliably pressed against the positioning projections 34 and the support surface of the frame 32.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, each of the first and second positioning projections has a continuous L-shape. However, the present invention is not limited to this.
It may be constituted by a pair of independent projections having a contact surface extending in the direction and the Y direction. Further, the frame and bezel of the backlight unit may be formed integrally with, for example, a housing of a device on which the liquid crystal display device is mounted.

[0034]

As described in detail above, according to the present invention, the liquid crystal panel can be stably held at a predetermined position with respect to the backlight unit and the bezel, and the variation in the center of the display screen is reduced. In addition, a highly reliable flat display device having uniform luminance can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the liquid crystal display device.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a plan view showing an engagement state between a corner of a liquid crystal panel and a first positioning projection in the liquid crystal display device.

FIG. 5 is a plan view showing an arrangement state of a corner portion of a liquid crystal panel and a second positioning projection in the liquid crystal display device.

FIG. 6 is a plan view showing an engagement state between a corner of a liquid crystal panel and a third positioning projection in the liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Liquid crystal panel 12 ... Backlight unit 14 ... Bezel 14a ... Top wall 14b ... Side wall 20 ... Array board 22 ... Counter substrate 30 ... Light guide plate 32 ... Frame 32a ... Support surface 34 ... 1st positioning protrusion 35 ... 2nd positioning protrusion 36: third positioning projection 40: pressing projection

Claims (5)

[Claims] 1. A substantially rectangular backlight unit having a light guide plate, a frame supporting a peripheral portion of the light guide plate, a substantially rectangular liquid crystal panel superposed on the backlight unit, A rectangular frame-shaped bezel fixed to the frame of the backlight unit and arranged on the liquid crystal panel, wherein the frame of the backlight unit is positioned in two directions orthogonal to each other on the liquid crystal panel. And a second positioning projection provided opposite to the first positioning projection. The bezel is fitted between the second positioning projection and the liquid crystal panel, and the liquid crystal is A flat display device comprising: a pressing projection that presses a panel against a first positioning projection. 2. The liquid crystal panel according to claim 2, wherein the first positioning projection is formed in an L-shape in contact with one corner of the liquid crystal panel.
The positioning projection is formed in an L-shape corresponding to another corner diagonally separated from the corner of the liquid crystal panel, and is positioned opposite the other corner with a predetermined gap. The flat panel display device according to claim 1, wherein the flat panel display device is provided on a flat panel display. 3. The liquid crystal panel according to claim 2, wherein the pressing projection of the bezel is formed in a substantially L-shape corresponding to a gap between the second positioning projection and the other corner of the liquid crystal panel. A flat display device as described in the above. 4. The flat display device according to claim 1, wherein the pressing projection of the bezel has a sectional shape tapering toward the backlight unit. 5. The frame of the backlight unit,
A support surface on which a peripheral portion of the liquid crystal panel is placed; the first and second positioning projections projecting from the support surface; and the bezel includes a peripheral portion of the liquid crystal panel and the second
The flat display device according to claim 1, further comprising an upper surface wall facing the positioning protrusion, wherein the pressing protrusion protrudes from the upper surface wall toward the frame.