JPH10206828A - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

(57) [Problem] To provide a liquid crystal display device which can completely prevent dust from entering between a liquid crystal display panel and a backlight. SOLUTION: In a liquid crystal display device including a liquid crystal display panel (102) and a backlight for irradiating the liquid crystal display panel, a ring-shaped spacer (150) interposed between the liquid crystal display panel and the backlight is provided. Have. The ring-shaped spacer (150) is inserted into an insertion groove (151) formed in the frame (105) of the backlight. Alternatively, it is locked by a system stop projection (152) formed on the frame (105) of the backlight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which dust is completely prevented from entering between a liquid crystal display panel and a backlight after the liquid crystal display device is assembled. It relates to a display device.

[0002]

2. Description of the Related Art Conventionally, a simple matrix type liquid crystal display module (LCM) has been known as one of liquid crystal display devices.

FIG. 7 is an exploded perspective view of a conventional simple matrix type liquid crystal display module (LCM).

As shown in FIG. 1, a conventional simple matrix type liquid crystal display module (LCM) includes a cold cathode fluorescent lamp 5.
08, a light guide plate assembly 507 for irradiating the light from the cold cathode fluorescent lamp 508 to a liquid crystal display panel (LCD) 502, and a prism sheet 5 for condensing the light from the light guide plate assembly 507
06 and the lower frame 512 in which a white paint is applied to a metal plate are fitted into the window of the frame-shaped mold 505 in the order shown in FIG.

[0005] A cold cathode fluorescent lamp 508 is disposed close to and along the side surface of the light guide plate assembly 507, and includes the outside of the cold cathode fluorescent lamp 508 and the irradiation light incident surface of the light guide plate assembly 507. Over the area, the lamp reflection sheet 51
1 is provided. Thus, the light from the cold cathode fluorescent lamp 508 is guided to the light guide plate assembly 507 as much as possible, and the space is saved.

Here, a mold 505, a prism sheet 506, a cold cathode fluorescent lamp 508, a lamp reflection sheet 51
1. The light guide plate assembly 507 and the lower frame 512
A backlight 515 for irradiating the liquid crystal display panel (LCD) 502 with light is configured. The mold 505
Is formed of a plastic material in which a polycarbonate and an ABS resin are mixed. 509 is a rubber bush, and 510 is a cable connector.

A segment side driving circuit board (SEG PCB) 50 is provided around a liquid crystal display panel (LCD) 502.
3. Common side drive circuit / power supply circuit board (COM / POW
(PCB) 504 is mounted, and each drive circuit board (5
03, 504) includes a tape carrier package (51).
3, 514) are implemented. Each of the tape carrier packages (513, 514) includes a liquid crystal display panel (LC).
D) An IC chip for driving 502 is mounted by a tape automated bonding method (TAB).

A conventional liquid crystal display module (LCM) is
A liquid crystal display panel (LCD) 502 around which each drive circuit board (503, 504) is mounted is placed on a window of a mold 505, and an upper frame 501 made of a metal plate is stacked thereon. Assembling is performed by sandwiching the lower frame 512 with claws provided on the 501.

[0009]

Although not shown in FIG. 7, a silicon resin spacer is provided between a liquid crystal display panel (LCD) 502 and a backlight 515.

FIG. 8 shows a conventional liquid crystal display module (LC).
M) is a cross-sectional view showing a cross-section of a main part (cross-section cut along the line BB ′ shown in FIG. 7), and FIG. 9 is a view showing attachment of a silicon resin spacer in a conventional liquid crystal display module (LCM). It is a figure for explaining a method.

As shown in FIGS. 8 and 9, between a liquid crystal display panel (LCD) 502 and a backlight 515, a silicon resin spacer 550a provided on two sides on the segment side drive circuit board 503 side and a common And a silicon resin spacer 550b provided on one side on the side of the side drive circuit / power supply circuit board 504.

The silicon spacers (550a, 550)
b) a display panel (LCD) 502 and a backlight 5
15 to prevent dust from entering the display surface of the liquid crystal display panel (LCD) 502 or when a shock is applied to the liquid crystal display module (LCM).
It is provided as a cushion material for protecting the display panel (LCD) 502.

Each silicon resin spacer (550a, 55
In the conventional liquid crystal display module (LCM), each of the silicone resin spacers (550a, 550b) is provided with an adhesive on one side, and the surface of the mold 505 facing the liquid crystal display panel (LCD) 502 is formed. It was manually pasted on three sides. As shown in FIG. 9, a double-sided adhesive tape 551 was manually applied between the silicon resin spacers (550a, 550b).

Therefore, the conventional liquid crystal display module (L
CM), each silicone resin spacer (550
(a, 550b), or a gap between the silicone resin spacers (550a, 550b) due to an elongation or manual shift, and it was not possible to completely prevent dust from entering.

Then, after assembling the liquid crystal display device, a liquid crystal display panel (LCD) 502 and a backlight 5 are inserted through gaps between the silicon resin spacers (550a, 550b).
When dust enters between the liquid crystal display panel 15 and the liquid crystal display panel (LCD) 502, black light is always generated on the liquid crystal display panel (LCD) 502 because the irradiation light from the backlight 515 is cut by the dust.
There is a problem that the display quality of the display image displayed on the liquid crystal display panel (LCD) 502 is significantly impaired.

Further, a conventional liquid crystal display module (LC
M), three silicon resin spacers (550)
a, 550b) and the double-sided pressure-sensitive adhesive tape 551 are manually adhered to each other, so that there is a problem that workability in assembling the liquid crystal display device is deteriorated.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to prevent dust from entering between a liquid crystal display panel and a backlight in a liquid crystal display device. It is an object of the present invention to provide a technology that can completely prevent the occurrence of a spill.

Another object of the present invention is to provide a method of manufacturing a liquid crystal display device, which simplifies the assembling operation of the liquid crystal display device and improves the workability of the assembling operation of the liquid crystal display device. To provide.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0020]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

[0021] In a liquid crystal display device comprising a liquid crystal display panel and a backlight for irradiating the liquid crystal display panel, a ring-shaped spacer interposed between the liquid crystal display panel and the backlight is provided.

The backlight has a frame for accommodating the light source, and the frame has an insertion groove in at least a part of a periphery thereof, into which the ring-shaped spacer is inserted.

The backlight has a frame for accommodating the light source, and the frame has, at least in part around the frame, a system stop projection for locking the ring-shaped spacer.

In a method for manufacturing a liquid crystal display device including a liquid crystal display panel and a backlight for irradiating the liquid crystal display panel, a step of manufacturing the liquid crystal display panel;
Manufacturing the backlight, attaching a ring-shaped spacer to a surface of the backlight facing the liquid crystal display panel, and assembling the liquid crystal display panel and the backlight via the ring-shaped spacer. And a process.

[0025] The backlight has a frame for accommodating the light source, and the frame has an insertion groove in at least a part of a periphery thereof, into which the ring-shaped spacer is inserted. The step of attaching the ring-shaped spacer to the backlight is a step of inserting the ring-shaped spacer into an insertion groove.

[0026] The backlight has a frame for accommodating the light source, and the frame has a projection on at least a part of its periphery for engaging the ring-shaped spacer.
The step of attaching the ring-shaped spacer to the backlight is a step of fixing the ring-shaped spacer to the system stop projection.

The ring-shaped spacer is made of a silicon resin material.

According to the above-mentioned means, since the integrally formed ring-shaped spacer is used as the spacer provided between the liquid crystal display panel and the backlight, the gap between the liquid crystal display panel and the spacer is reduced. Therefore, it is possible to completely prevent dust from entering after assembly.

According to the above-mentioned means, it is not necessary to attach several spacers and a double-sided tape as in the prior art, and it is possible to easily attach them in one process, so that it is possible to improve workability. Become.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to a simple matrix type liquid crystal display module (LCM) will be described below with reference to the drawings.

In all the drawings for describing the embodiments of the present invention, those having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.

[Embodiment 1] FIG. 1 is a perspective view showing a schematic configuration of a simple matrix type liquid crystal display module (LCM) according to an embodiment of the present invention.

In the figure, 101 is a frame-shaped upper frame made of metal, 102 is a liquid crystal display panel (LCD),
103 is a segment side drive circuit board (SEG PC
B) and 104 are common side drive circuits and power supply circuit boards (CO
M / POW PCB), 105 is a mold, 106 is a prism sheet, 107 is a light guide, 108 is a cold cathode fluorescent lamp (cold cathode tube, CFL), 109 is a rubber bush, 110
Is a cable connector, 111 is a lamp reflection sheet (silver reflection sheet), 112 is a lower frame made of a metal plate, 1
13 is a segment side drive circuit board (SEG PCB) 1
03, a tape carrier package mounted on the common side drive circuit / power supply circuit board 104; 115, a backlight;
0 is a ring-shaped spacer.

The liquid crystal display module (LCM) according to the embodiment of the present invention is shown in FIG. 7 except that a ring-shaped spacer 150 is provided between the liquid crystal display panel (LCD) 102 and the backlight 115. Since it is the same as a conventional liquid crystal display module (LCM), a detailed description thereof will be omitted.

FIG. 2 shows a light guide plate assembly 10 according to this embodiment.
7 is an exploded perspective view showing a schematic configuration of FIG.

As shown in FIG. 2, the light guide plate assembly 107
Is composed of a light guide plate 201, a diffusion sheet 202 and a reflection sheet 203 provided on both sides of the light guide plate 201.

On both sides of the light guide plate 201 (in a direction perpendicular to the surface facing the cold cathode fluorescent lamp 108), a convex portion 204 is provided at the position of the center of gravity of the light guide plate 201.
01 is prevented from colliding with the cold cathode fluorescent lamp 108 due to the impact, and the cold cathode fluorescent lamp 108 is prevented from being destroyed.

In this case, the convex portion 204 formed on the light guide plate 201 is formed at the position of the center of gravity of the light guide plate 201. Therefore, when the light guide plate 201 has a wedge shape, the position of the convex portion 204 is Are formed at positions near the cold cathode fluorescent lamp 108.

FIG. 3 is a diagram showing a schematic configuration of the mold 105 of the present embodiment, and FIG.
FIG. 3B is a plan view showing a schematic configuration of FIG.
It is a front view which shows the front of FIG.

The mold 105 shown in FIG. 3 has a window 211, and three projections (21) are provided outside the window 211.
2, 213, 214) are formed, and the concave portion 22 formed by the three projections (212, 213, 214) is formed.
1 is fitted with a convex portion 204 provided on the light guide plate 201.

The three projections (212, 21)
3, 214), a protrusion 215 having a recess 223 formed therein is also formed, and the three protrusions (212, 21) are formed.
3, 214) and the protrusion 215 form a groove 222.

In the embodiment of the present invention, the mold 105
Of the projections 204 provided on the light guide plate 201
And the cold cathode fluorescent lamp 108 and the light guide plate 201 are attached to the mold 105. By arranging the GND side cable 205 in the groove 222, the cable 110 is routed along the light guide plate 201 and pulled out from the recess 223.

Further, a protrusion 231 is formed on a cable lead-out portion outside the mold 105. That is, the protrusion 231 is provided between the cable drawing portion of the mold 105 and the upper frame 101, and the protrusion 2
31 makes it possible to prevent the cable 110 from contacting the upper frame 101.

As a result, in the present embodiment, it is possible to prevent the insulation of the cable 110 from being cut off, thereby improving the safety of the liquid crystal display device or preventing the liquid crystal display device from being turned off. Become.

FIG. 4 is a plan view showing the front of the mold 105 of the present embodiment on the liquid crystal display panel (LCD) side.

In the mold 105 shown in the figure, a spacer insertion groove 151 is provided outside the window 211 of the mold 105.
Is formed.

FIG. 5 is a cross-sectional view showing a main part cross section (a cross section cut along the line AA ′ shown in FIG. 1) of the liquid crystal display module (LCM) of the present embodiment.

As shown in the figure, in the liquid crystal display module (LCM) of the present embodiment, the prism sheet 106,
The light guide plate assembly 107, the cold cathode fluorescent lamp 108, the lamp reflection sheet 111, and the lower frame 112 are fitted into the window of the mold 105 formed in a frame shape, and the backlight 115 is assembled.

After that, the ring-shaped spacer 150 is inserted into the spacer insertion groove 151 formed outside the window 211 of the mold 105.

Then, the window 211 of the mold 105
A liquid crystal display panel (LCD) 102 around which each drive circuit board (103, 104) is mounted is mounted thereon, and an upper frame 101 made of a metal plate is stacked thereon. Assembling is performed by sandwiching the lower frame 112 between the claws.

As described above, in the liquid crystal display module (LCM) of the present embodiment, the ring-shaped spacer 150 is inserted into the spacer insertion groove 151 formed in the mold 105.
Is inserted, so that there is no gap between the spacers (550 shown in FIG. 9) unlike the related art, so that the liquid crystal display panel (LCD) 102 and the backlight 1
15 can be completely sealed.

Thus, in the liquid crystal display module (LCM) of the present embodiment, the liquid crystal display panel (LCM) is
It is possible to completely prevent dust from entering between the CD) 102 and the backlight 115, and it is possible to improve the display quality of a display image displayed on the liquid crystal display panel (LCD) 102. .

The mounting of the ring-shaped spacer 150 is only required to insert the ring-shaped spacer 151 into the spacer insertion groove 151 formed in the mold 105. 550 shown)
Since the three steps of attaching the double-sided adhesive tape (551 shown in FIG. 9) and the two steps of attaching the double-sided adhesive tape need only be one step of inserting the ring-shaped spacer 151 into the insertion groove 151 formed in the mold 105, Display module (LC
The manufacturing process of M) can be simplified, and the workability can be improved.

The spacer insertion grooves 151 need not always be formed on the entire periphery of the mold 105, but may be formed at four corners.

As the material of the ring-shaped spacer 150, an elastic material such as a silicon-based resin material, a urethane-based resin material, or a rubber-based material can be used. Any shape such as an ellipse can be adopted.

Further, the thickness of the ring-shaped spacer 150 depends on the crimping pressure when the lower frame 112 is sandwiched by the claws provided on the upper frame 101 and the deformability of the ring-shaped spacer 150 due to the caulking pressure. Considering that, in the state where the liquid crystal display module (LCM) is assembled,
The distance (L shown in FIG. 5) between the liquid crystal display panel (LCD) and the backlight 115 is set to be about 0.5 mm.

Here, the thickness of the ring-shaped spacer 150 means the length in the direction perpendicular to the mold 105. For example, if the cross-sectional shape of the ring-shaped spacer 150 is a circle, its diameter is represented by the ring-shaped. If the cross-sectional shape of the spacer 150 is square, it means the length in the direction perpendicular to the mold 105.

For example, the ring-shaped spacer 150 is made of a silicon-based resin material having a circular cross section, and the silicon-based resin material is about 20% as in the conventional liquid crystal display module (LCM). In the case of a caulking pressure that causes compression, the thickness (diameter) of the ring-shaped spacer 150 is desirably about 1 mm.

[Second Embodiment of the Invention] Second Embodiment
Is the same as the liquid crystal display module (LCM) of the above-described embodiment except that a spacer locking projection 152 is formed on the mold 105 instead of the spacer insertion 151, and a detailed description thereof will be omitted.

FIG. 6 is a plan view showing the front of the liquid crystal display panel (LCD) side of the mold 105 of the present embodiment.

In the mold 105 shown in the figure, spacer engaging projections 152 are formed outside the four corners of the window 211 of the mold 105.

The liquid crystal display module (LC
In M), since the ring-shaped spacer 150 is locked to the spacer locking projection 152 formed on the mold 105, each spacer (55 in FIG.
Since no gap is generated between 0), the space between the liquid crystal display panel (LCD) 102 and the backlight 115 can be completely sealed.

Thus, in the liquid crystal display module (LCM) of the present embodiment, after assembling, the liquid crystal display panel (LCM)
It is possible to completely prevent dust from entering between the CD) 102 and the backlight 115, and it is possible to improve the display quality of a display image displayed on the liquid crystal display panel (LCD) 102. .

The mounting of the ring-shaped spacer 150 is only required to lock the ring-shaped spacer 151 on the spacer locking projection 152 formed on the mold 105. 55 shown in FIG.
0) and two steps of attaching a double-sided adhesive tape (551 shown in FIG. 9) to the mold 10
Since only one process of locking the ring-shaped spacer 151 to the locking projection 152 formed on the fifth liquid crystal panel 5, the manufacturing process of the liquid crystal display module (LCM) can be simplified, and the workability thereof can be improved. .

In each of the embodiments of the present invention, the case where the present invention is applied to an STN type simple matrix liquid crystal display panel has been described. However, the present invention is not limited to this. It is needless to say that the present invention can be applied to an active type liquid crystal display panel.

As described above, the present invention has been specifically described based on the embodiments of the present invention. However, the present invention is not limited to the embodiments of the present invention, and various modifications may be made without departing from the gist of the present invention. It goes without saying that you get it.

[0067]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1) According to the present invention, the space between the liquid crystal display panel and the backlight can be completely sealed, so that dust can enter between the liquid crystal display panel and the backlight after assembly. And the display quality of the liquid crystal display panel can be improved.

(2) According to the present invention, the assembling work of the liquid crystal display device can be simplified, and the workability of the assembling work of the liquid crystal display device can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a simple matrix type liquid crystal display module (LCM) according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating a schematic configuration of a light guide plate assembly 107 according to the first embodiment.

FIG. 3 is a diagram illustrating a schematic configuration of a mold 105 according to the first embodiment.

FIG. 4 is a plan view showing a front surface of a mold 105 of the first embodiment on a liquid crystal display panel (LCD) side.

FIG. 5 shows a liquid crystal display module (LC) according to the first embodiment.
FIG. 8 is a cross-sectional view illustrating a cross section of the main part of FIG.

FIG. 6 is a plan view showing a front surface of a mold 105 according to the second embodiment on a liquid crystal display panel (LCD) side.

FIG. 7 is an exploded perspective view of a conventional simple matrix type liquid crystal display module (LCM).

FIG. 8 is a cross-sectional view showing a main part cross section (a cross section cut along the AA ′ cutting line shown in FIG. 7) of the conventional liquid crystal display module (LCM).

FIG. 9 is a diagram for explaining a method of attaching a silicon resin spacer 550 in a conventional liquid crystal display module (LCM).

[Explanation of symbols]

101, 501: Upper frame, 102, 503: Liquid crystal display panel (LCD), 103, 104, 504: Drive circuit board, 105, 505: Mold, 106, 506
... Prism sheet, 107,507 ... Light guide, 108,
508: cold cathode fluorescent lamp (cold cathode tube), 109, 509 ...
Rubber bush, 110, 510 ... cable connector, 1
11, 511: lamp reflection sheet, 112, 512: lower frame, 113, 114: tape carrier package (TCP), 115, 515: backlight, 15
0, 550a, 550b: spacer, 151: spacer insertion groove, 152: spacer locking projection, 201: light guide plate, 202: diffusion sheet, 203: reflection sheet, 204
... Convex part, 211... Window part, 212, 213, 214, 21
5,231 ... protrusion, 221,223 ... recess, 222 ...
Groove, 551: Double-sided adhesive tape.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiyuki Tsukizaki 3300 Hayano, Mobara-shi, Chiba Hitachi, Ltd. Electronic Device Division

Claims (7)

[Claims] 1. A liquid crystal display device comprising a liquid crystal display panel and a backlight for irradiating the liquid crystal display panel, comprising a ring-shaped spacer interposed between the liquid crystal display panel and the backlight. A liquid crystal display device characterized by the above-mentioned. 2. The backlight according to claim 1, wherein the backlight has a frame that houses the light source, and the frame has an insertion groove in at least a part of a periphery thereof, into which the ring-shaped spacer is inserted. The liquid crystal display device according to claim 1, wherein: 3. The backlight has a frame that houses the light source, and the frame has, at least in part around the frame, a system stop projection that locks the ring-shaped spacer. The liquid crystal display device according to claim 1, wherein: 4. The liquid crystal display device according to claim 1, wherein the ring-shaped spacer is made of a silicon-based resin material. 5. A method for manufacturing a liquid crystal display device including a liquid crystal display panel and a backlight for irradiating the liquid crystal display panel, wherein: a step of manufacturing the liquid crystal display panel; and a step of manufacturing the backlight. A liquid crystal display device comprising: a step of attaching a ring-shaped spacer to a surface of the backlight that faces the liquid crystal display panel; and a step of assembling the liquid crystal display panel and the backlight via the ring-shaped spacer. Production method. 6. The backlight has a frame for accommodating the light source, and the frame has an insertion groove in at least a part of a periphery thereof, into which the ring-shaped spacer is inserted. 6. The method according to claim 5, wherein the step of attaching the ring-shaped spacer to the backlight is a step of inserting the ring-shaped spacer into an insertion groove. 7. The backlight has a frame that accommodates the light source, and the frame has a projection that locks the ring-shaped spacer on at least a part of its periphery. 6. The method according to claim 5, wherein the step of attaching the ring-shaped spacer to the backlight is a step of fixing the ring-shaped spacer to a system stop projection.