JPH09274182A - Liquid crystal display - Google Patents

Abstract

(57) [PROBLEMS] To provide a liquid crystal display device in which bright lines are prevented from occurring in a display screen of a liquid crystal display panel and display quality is improved. A liquid crystal display device including a liquid crystal display panel having a liquid crystal layer injected and sealed between a pair of electrode substrates, and a backlight for irradiating the liquid crystal display panel with irradiation light, the backlight comprising: A light source (208) and a light guide plate assembly (207) having one side surface facing the light source.
And a reflection sheet (209) which is provided around the light source so as to cover the light source so that both ends thereof overlap the light source side end portion of the light guide plate assembly. A gray or black antireflection film (280) is provided at an end portion of the reflection surface that reflects the irradiation light, the end portion on the side overlapping the surface of the light guide plate assembly on the liquid crystal display panel side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal drive circuit and a liquid crystal display device, and more particularly to a technique effectively applied to narrowing a frame of a liquid crystal display panel.

[0002]

2. Description of the Related Art As a conventional liquid crystal display device, a simple matrix type liquid crystal display device for driving a pixel at an intersection of stripe-shaped XY electrodes and an active element (for example, a thin film transistor) for each pixel are provided. It is roughly classified into an active matrix type liquid crystal display device that performs switching driving.

FIG. 19 shows a conventional color STN (Super Twi) which is one of simple matrix type liquid crystal display devices.
FIG. 4 is an exploded perspective view showing components of a simple matrix type liquid crystal display module (LCM) of a steed Nematic type.

The liquid crystal display panel 503 includes a pair of glass substrates arranged to face each other with a liquid crystal interposed therebetween, and a liquid crystal side surface of one of the glass substrates extends in the X direction and Y.
M common electrodes (scanning signal lines) arranged in parallel in the direction are formed, and Y is formed on the liquid crystal side surface of the other glass substrate.
N segment electrodes (data signal lines) extending in the X direction and arranged in parallel in the X direction are formed.

The n segment electrodes are divided into upper and lower parts, and the intersection of the plurality of segment electrodes and the plurality of common electrodes constitutes a pixel region.

A liquid crystal display module (LC
In M), the cold cathode tube 528, the cold cathode tube 528
A light guide plate assembly 527 for irradiating the liquid crystal display panel 503 with light from the light guide plate, a prism sheet 526 for collecting light from the light guide plate assembly 527, and a lower frame 532 in which white paint is applied to a metal plate, It is fitted into the window portion of the mold 525 formed in a frame shape in the order shown in FIG.

Here, as shown in FIG. 20, the light guide plate assembly 527 comprises a light guide plate 551 made of an acrylic plate, and a reflection sheet 552 and a diffusion sheet 553 formed on both sides of the light guide plate 551.

A silver reflection sheet 529 is disposed around the cold cathode fluorescent lamp 528 to collect light emitted in a direction different from that of the light guide plate assembly 527 onto the light guide plate assembly 527 without waste.

Here, the mold 525, the prism sheet 526, the cold cathode tube 528, the silver reflection sheet 529, the light guide plate assembly 527 and the lower frame 532 constitute a backlight for irradiating the liquid crystal display panel 503 with light. To do.

In FIG. 19, 530 indicates a rubber bush.

FIG. 21 shows a drive circuit board 52 shown in FIG.
FIG. 4 is a plan view of a liquid crystal display panel 503 mounted on the periphery.

As shown in FIG. 21, a drive circuit board 524.
Is divided into three, and each drive circuit board (524a, 524b,
524c) are provided along the sides of the liquid crystal display panel 503, respectively, and each drive circuit board (524a, 524b,
524c) are electrically connected by a flat cable 536.

Each drive circuit board (524a, 524b, 5)
24c) includes a tape carrier package (535a,
535b, 535c), electronic components such as resistors or capacitors are mounted, and each tape carrier package (53
5a, 535b, and 535c) include the liquid crystal display panel 50.
Chip (semiconductor chip) (537) for driving
a, 537b, 537c) are mounted by a tape automated bonding method (TAB).

Each of the m common electrodes of the liquid crystal display panel 503 corresponds to the corresponding tape carrier package 5.
35c, and each of the n divided segment electrodes of the liquid crystal display panel 503 has a corresponding upper side tape carrier package 535a or a lower side corresponding tape carrier package 535.
b.

The tape carrier package (535)
a, 535b), a data signal line driving voltage is applied to each of the plurality of segment electrodes, and a scanning signal line driving voltage is applied to the plurality of common electrodes from each of the tape carrier packages 535c to drive the pixels. To do.

Each drive circuit board (524a, 524b, 5)
24c) is mounted around the liquid crystal display panel 503 in the periphery of the mold 525, and the silicon spacer 522, the rod spacer 532, and the upper frame 521 having the display window are stacked on the liquid crystal display panel 503. The simple matrix type liquid crystal display module shown in FIG. 19 is assembled by sandwiching the lower frame with the claws provided on the.

As described above, the simple matrix type liquid crystal display module (LCM) shown in FIG.
A liquid crystal display panel 503 having a display 24 mounted around and a backlight are housed between an upper frame 521 having a display window and a lower frame 532.

The area of the display window of the upper frame 521 is a simple matrix type liquid crystal display module (LC
The area other than the display area of the simple matrix type liquid crystal display module (LCM), that is, the area around the display window of the upper frame 521, which constitutes the display area of M), is usually called a frame, and in this frame area, As is clear from FIG.
Tape carrier package 535, drive circuit board 524
A cold cathode tube 528 is housed.

[0019]

In recent years, in a liquid crystal display device such as a liquid crystal display module (LCM), the display screen has become larger and larger, and the display screen size tends to be larger. There is a demand for reducing the area other than the display area of the liquid crystal display device, that is, the frame portion, as much as possible, in order to eliminate the problem and aesthetic appearance as the display device.

However, when the frame portion of the liquid crystal display module (LCM) shown in FIG. 19 is made small, a region in the display screen of the liquid crystal display panel 503, which is close to the upper frame 521 on the side where the cold cathode tubes 528 are housed. However, the present inventor has found that a bright line (a region that emits a bright line) is generated in the display screen of the liquid crystal display panel 503 by lighting brighter than other regions.

The bright line is the liquid crystal display panel 50.
There is a problem that the display quality of the display image displayed in No. 3 is significantly impaired.

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 bright lines from occurring in the display screen of a liquid crystal display panel in a liquid crystal display device. And to provide a technology capable of improving the display quality.

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

[0024]

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.

(1) A liquid crystal display device comprising a liquid crystal display panel having a liquid crystal layer injected and sealed between a pair of electrode substrates, and a backlight for irradiating the liquid crystal display panel with irradiation light. The backlight includes a light source, a light guide plate assembly having one side surface facing the light source, a periphery of the light source so as to cover the light source, and both ends of the light guide plate assembly on the light source side of the light guide plate assembly. In a liquid crystal display device having a reflection sheet provided so as to overlap the end portion, the reflection sheet is a reflection surface that reflects irradiation light from the light source, and a surface of the light guide plate assembly on the liquid crystal display panel side. It is characterized in that it has a gray or black antireflection film at the end on the overlapping side.

(2) In the above-mentioned (1) means, the end surface of the antireflection film on the light source side is aligned with the end portion of the light guide plate assembly on the light source side.

(3) In the above (1) means, the end surface of the antireflection film on the light source side projects toward the light source side from the end portion of the light guide plate assembly on the light source side.

(4) In the means (1) to (3), the gray or black antireflection film is formed by printing.

(5) In the means of (4), the reflectance of the antireflection film is adjusted by changing the ink density when the gray or black antireflection film is formed by the printing. To do.

According to each of the above means, an antireflection film is provided at the end of the reflection sheet provided around the light source, which is on the side overlapping the surface of the light guide plate assembly on the liquid crystal display panel side, and is reflected by the reflection sheet. The antireflection film absorbs the irradiation light entering the light guide plate assembly from the liquid crystal display panel side surface of the light guide plate assembly,
Since the irradiation light entering the light guide plate assembly from the liquid crystal display panel side surface of the light guide plate assembly is prevented from being irradiated to the liquid crystal display panel side, the frame area of the liquid crystal display device is narrowed. However, it is possible to prevent the generation of bright lines on the display screen of the liquid crystal display panel.

[0031]

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

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

[First Embodiment of the Invention] FIG. 1 shows a liquid crystal display used in a color STN type simple matrix type liquid crystal display module according to an embodiment (first embodiment of the present invention) of the present invention. 2 is an exploded perspective view showing components of the panel, and FIG. 2 is a cross-sectional view of a main part of the liquid crystal display panel shown in FIG. 1.

As shown in FIG. 1 or 2, in the liquid crystal display panel 100 according to the first embodiment of the present invention, a strip-shaped transparent conductive film (ITO) is formed on the glass substrate 1 side with the liquid crystal layer 10 as a reference. ), A plurality of segment electrodes (data signal lines) 13 are formed, and a plurality of common electrodes (scanning signal lines) 14 made of a band-shaped transparent conductive film (ITO) are formed on the glass substrate 2 side.

A plurality of segment electrodes 13 and an alignment film 7 are sequentially laminated inside the glass substrate 1 (on the side of the liquid crystal layer 10), and inside the glass substrate 2 (on the side of the liquid crystal layer 10), a color filter (4a) is formed. , 4b, 4c), the light-shielding film 3, the protective film 5, the plurality of common electrodes 14, and the alignment film 6 are sequentially laminated.

On the outside of the glass substrate 1, the polarizing plate 1
1 and a retardation plate 15 are formed, and a polarizing plate 12 is formed outside the glass substrate 2.

Reference numeral 25 in FIG. 2 indicates a region where the polarizing plate 11 and the retardation plate 15 are formed outside the glass substrate 1.

The common electrode 14 and the segment electrode 13 are orthogonal to each other, and the intersection of the common electrode 14 and the segment electrode 13 constitutes one pixel.

Further, the segment electrode 13 and the common electrode 14 extend to one end portions of the glass substrate 1 and the glass substrate 2, respectively, and terminal portions (23, 2) for electrically connecting with the segment driver and the common driver.
4) is formed.

Here, the segment electrode 13 is composed of segment electrodes (13a, 13b, 13c) for R (red), G (green) and B (blue), respectively.

Color filters (4a, 4b, 4)
c), the lattice-shaped light-shielding film 3 is formed so as to surround the common electrode 1.
4 and between the segment electrodes 13.

Further, as shown in FIG. 2, the liquid crystal layer 10 is filled with a spacer 8 for keeping the thickness of the liquid crystal layer 10 uniform.

The glass substrate 2, the light shielding film (3),
The color filters (4a, 4b, 4c), the protective film 5, the plurality of common electrodes 14, the alignment film 6, and the polarizing plate 12 constitute the common electrode substrate 110, and the glass substrate 1, the plurality of segment electrodes 13, the alignment Film 7, polarizing plate 11, retardation plate 1
5 constitutes the segment electrode substrate 120.

Liquid crystal display panel 1 according to Embodiment 1 of the present invention
00 is manufactured by the following steps.

(A) After the common electrode substrate 110 and the segment electrode 120 are individually manufactured, the sealing material 9 is formed around the common electrode substrate 100 and the spacer 8 is arranged inside the sealing material 9.

(B) The pattern surfaces of the common electrode substrate 110 and the segment electrode substrate 120 are aligned with each other, and the outer surfaces of the common electrode substrate 110 and the segment electrode substrate 120 are heated under pressure to cure the sealing material 9 and The electrode substrate 110 and the segment electrode substrate 120 are adhesively sealed.

(C) The liquid crystal layer 10 is injected from the opening of the sealing material, the opening is sealed with epoxy resin or the like, and finally, the retardation plate 15 and the polarization plate are placed on the glass substrate (1, 2). Stick the plates (14, 15).

FIG. 3 is a schematic cross-sectional view of the peripheral portion of the liquid crystal display module (LCM) according to the first embodiment of the present invention, on the side where the cold cathode tubes are arranged (where the cold cathode tubes 528 of FIG. 19 are arranged. Side).

In the liquid crystal display module according to the first embodiment of the present invention, as in the conventional simple matrix type liquid crystal display module (LCM) shown in FIG. 19, the liquid crystal display panel 100 shown in FIG. A drive circuit board is mounted.

This drive circuit board is divided into three parts, which are provided along the sides of the liquid crystal display panel 100, and the drive circuit boards are electrically connected by a flat cable (not shown).

Electronic components such as a tape carrier package and resistors or capacitors are mounted on each drive circuit board, and the liquid crystal display panel 1 is mounted on the tape carrier package.
00 is mounted by a tape automated bonding (TAB) method.

FIG. 3 shows only the drive circuit board 204 and the tape carrier package 300 provided on the upper side (or the lower side) of the liquid crystal display panel, and the IC carrier 301 is mounted on the tape carrier package 300. It

The liquid crystal display module according to the first embodiment of the present invention is the conventional liquid crystal display module (L
Similar to CM), the drive circuit board 20 is provided on the backlight.
4 and the remaining two drive circuit boards are mounted around the liquid crystal display panel 100 shown in FIG. 1 or 2, and a silicon spacer (not shown) and a rod spacer (not shown) are further mounted thereon. ), Upper frame 20 with display window
1 is piled up and the lower frame 212 is sandwiched by the claws provided on the upper frame 201 to assemble.

Further, similar to the conventional liquid crystal display module (LCM) shown in FIG. 19, a cold cathode tube 208, a light guide plate assembly 207 for irradiating the liquid crystal display panel 100 with light from the cold cathode tube 208, and a light guide plate assembly. The prism sheet 206 that collects the light from the three-dimensional body 207 and the lower frame 212 in which the white paint is applied to the metal plate are fitted into the window of the frame-shaped mold 205 in the order shown in FIG. Be done.

In addition, around the cold cathode fluorescent lamp 208, the silver reflection sheet 20 for concentrating light emitted in a different direction from the light guide plate assembly 207 onto the light guide plate assembly 207 without waste.
9 are arranged.

Here, the light guide plate assembly 207 comprises a light guide plate 251 made of an acrylic plate, a reflection sheet 252 and a diffusion sheet 253 formed on both sides of the light guide plate, and includes a mold 205, a prism sheet 206 and a cold cathode. The tube 208, the silver reflection sheet 209, the light guide plate assembly 207, and the lower frame 212 form a backlight.

FIG. 4 shows the cold cathode tubes 208 and the silver reflection sheet 20 of the liquid crystal display module according to the first embodiment of the present invention.
9 is a cross-sectional view showing in more detail the correspondence relationship between the light guide plate assembly 207. FIG.

As shown in FIG. 4, the silver reflection sheet 209
Has one end fixed to the light guide plate 251 by the double-sided tape 210, and the diffusion sheet 253 is provided thereon.

In this case, the double-sided tape 210 is inserted from the one end of the light guide plate 251 on the cold cathode tube 208 side to the cold cathode tube 208.
It is arranged so as to project to the side.

A reflection sheet 252 is provided on the surface of the light guide plate 251 opposite to the side where the diffusion sheet 253 is provided, and a silver reflection sheet 209 is provided between the reflection sheet 252 and the lower frame 212. The edges are placed.

In FIG. 4, reference numeral 254 is a dot pattern for scattering the irradiation light from the cold cathode tubes 208.

FIG. 5 is a schematic plan view showing the reflection sheet 252 according to the first embodiment of the present invention.

As shown in FIG. 5, the first embodiment of the present invention
The reflection sheet 252 has a gray or black antireflection film 270 formed by printing at the end on the side facing the cold cathode tube 208 on the surface facing the light guide plate 251.

Further, the cold cathode tube 251 of the reflection sheet 252
So that one end on the side of the light guide plate 251 projects toward the cold cathode tube 208 side from the end on the side of the cold cathode tube 208 of the light guide plate 251.
2 is arranged on the opposite side of the light guide plate 251 from the liquid crystal display panel 100.

FIG. 6 is a view for explaining the reason why bright lines are generated by narrowing the frame region other than the display region of the liquid crystal display module, and is a cross-sectional view showing the periphery of the cold cathode tube in a simplified manner.

As shown in FIG. 6A, among the irradiation light from the cold cathode tubes 208, the irradiation light incident on the light guide plate 251 from the surface of the light guide plate 251 facing the cold cathode tubes 208 is:
The light is repeatedly reflected by the light guide plate 251, propagates, and enters the liquid crystal display panel 100.

However, as shown in FIG. 6B, among the irradiation light from the cold cathode fluorescent lamp 208, the irradiation light incident on the light guide plate 251 from the surface of the light guide plate 251 facing the reflection sheet 252 is the same. After passing through the light guide plate 251, the liquid crystal display panel 100 side is irradiated.

As shown in FIG. 6C, the cold cathode fluorescent lamp 2
In the irradiation light from 08, the diffusion sheet 2 of the light guide plate 251
The irradiation light incident on the light guide plate 251 from the surface facing the light guide plate 53 passes through the light guide plate 251, reaches the reflection sheet 252, is reflected by the reflection sheet 252, and is again reflected by the light guide plate 2.
It is incident on 51, passes through the light guide plate 251, and is irradiated to the liquid crystal display panel 100 side.

When the frame area other than the display area of the liquid crystal display module is wide, that is, when the distance (L3 shown in FIG. 3) between the cold cathode tube 208 and the display window portion of the upper frame 201 is large, The irradiation light shown in B or C was blocked by the mold 205 or the peripheral region of the upper frame 201, and was not irradiated to the liquid crystal display panel 100 side.

However, when the frame area other than the display area of the liquid crystal display module becomes narrow, that is, the cold cathode fluorescent lamp 20
8 and the display window portion of the upper frame 201 (L3 shown in FIG. 3) becomes smaller, the irradiation light shown in B or C of FIG. 6 is not blocked by the mold 205 or the peripheral region of the upper frame 201, The liquid crystal display panel 100 is irradiated with the light, which causes bright lines in the display screen of the liquid crystal display panel 100.

Therefore, in the liquid crystal display module according to the first embodiment of the present invention, gray or black formed by printing is formed on the end of the reflection sheet 252 facing the light guide plate 251 on the cold cathode tube 208 side. Of the antireflection film 270, and guides the reflection sheet 252 so that one end of the reflection sheet 252 on the cold cathode tube 251 side projects toward the cold cathode tube 208 side from one end of the light guide plate 251 on the cold cathode tube 208 side. The double-sided tape 210 is arranged on the opposite side of the light plate 251 from the liquid crystal display panel 100, and the double-sided tape 210 serves as the cold cathode tube 2 of the light guide plate 251.
The liquid crystal display panel 100 is prevented from being irradiated with the irradiation light shown in B or C of FIG. 6 by being arranged so as to project from one end on the 08 side toward the cold cathode tube 208 side.

That is, in the liquid crystal display module according to the first embodiment of the present invention, one end of the reflection sheet 252 on the cold cathode tube 251 side is closer to one end of the light guide plate 251 on the cold cathode tube 208 side.
Since it is projected to the cold cathode tube 208 side, the reflection sheet 2 of the light guide plate 251 as shown in FIG.
The amount of irradiation light that enters the light guide plate 251 from the surface opposite to 52 decreases.

In the liquid crystal display module according to the first embodiment of the present invention, the double-sided tape 210 is arranged so as to project from the one end of the light guide plate 251 on the cold cathode tube 208 side to the cold cathode tube 208 side. As shown in FIG. 6C, less irradiation light is incident on the light guide plate 251 from the surface of the light guide plate 251 facing the diffusion sheet 253.

Further, the light guide plate 25 of the reflection sheet 252.
Since the gray or black antireflection film 270 is provided at the end portion on the side facing the cold cathode tube 208 on the surface facing 1), the diffusion sheet 25 of the light guide plate 251 as shown in FIG.
Irradiation light that is incident on the light guide plate 251 from the surface opposite to 3 and passes through the double-sided tape 210 and the light guide plate 251 and reaches the reflection sheet 252 is absorbed by the antireflection film 270 of the reflection sheet 252, and therefore, the reflection sheet. 25
The amount of irradiation light that is reflected by 2 and is incident on the light guide plate 251 again decreases. Therefore, the amount of irradiation light that passes through the light guide plate 251 and is applied to the liquid crystal display panel 100 side decreases.

As a result, in the liquid crystal display module according to the first embodiment of the present invention, it becomes possible to prevent bright lines from being generated in the liquid crystal display panel 100.

Further, as shown in FIG. 6A, the light guide plate 25
When the irradiation light incident on the light guide plate 251 from the surface facing the cold cathode tube 208 of No. 1 propagates after being repeatedly reflected by the light guide plate 251, and is incident on the double-sided tape 210, the double-sided tape 210 is The incident irradiation light is the double-sided tape 21.
By being scattered by 0, a part of the irradiation light that has entered the double-sided tape 210 again enters the light guide plate 251 and causes a bright line in the display screen of the liquid crystal display panel 100.

However, the irradiation light scattered by the double-sided tape 210 and incident on the light guide plate 251 is also absorbed by the antireflection film 270.

In the liquid crystal display module according to the first embodiment of the present invention, the cold cathode tube 25 of the reflection sheet 252 is used.
One end on one side may be aligned with one end on the cold cathode tube 208 side of the light guide plate 251, and the double-sided tape 210 may be used.
One end of the cold cathode tube 251 side may be aligned with one end of the light guide plate 251 on the cold cathode tube 208 side.

However, since the light guide plate 251 is generally manufactured by injection molding or the like, the edge of the light guide plate 251 has a roundness, and from the edge of the light guide plate 251 having this roundness,
Since the irradiation light is incident on the light guide plate 251, the reflection sheet 2
It is advantageous in terms of effect that one end of the cold cathode tube 251 side of 52 projects toward the cold cathode tube 208 side from one end of the light guide plate 251 on the cold cathode tube 208 side.

As shown in FIG. 7, the antireflection film 270 has a length (L20) of 0.5 to 10 mm from one end of the reflection sheet 252 on the cold cathode tube 208 side, and the light guide plate 251 and the antireflection film 270. The overlap length (L21) with 270 is 0.5 to
The reflection sheet 2 has a length of 8 mm and projects from the one end of the light guide plate 251 on the cold cathode tube 208 side toward the cold cathode tube 208 side.
When 52 is arranged, its protruding length (L22)
Is formed so as not to exceed 1 mm.

Further, when the gray or black antireflection film 270 is formed on the reflection sheet 252 by printing, the reflectance of the antireflection film 270 is adjusted by changing the density of the ink and absorbed by the antireflection film 270. It is possible to change the ratio of the irradiation light that is generated, and thereby, even when the brightness (luminance) of the display screen of the liquid crystal display panel 100 differs, the cold cathode fluorescent lamp 5 can be displayed in the display screen of the liquid crystal display panel 503.
It is possible to adjust the brightness (luminance) of the area close to the upper frame 521 on the side where the 28 is stored.

[Second Embodiment of the Invention] FIG. 8 shows the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module according to the second embodiment of the present invention. It is sectional drawing shown in detail.

The liquid crystal display module according to the second embodiment of the present invention is a rectangular parallelepiped light guide plate 2 instead of the wedge-shaped light guide plate 251 in the liquid crystal display module according to the first embodiment of the present invention.
61 is used.

Also in the liquid crystal display module according to the second embodiment of the present invention, it is possible to prevent bright lines from being generated in the liquid crystal display panel 100.

[Third Embodiment of the Invention] FIG. 9 shows the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module of the third embodiment of the present invention. It is sectional drawing shown in detail.

The liquid crystal display module according to the third embodiment of the present invention is the same as the liquid crystal display module according to the first embodiment of the present invention, except that a gray or black antireflection film 280 is formed also on the silver reflection sheet 209 side. It is the one.

FIG. 10 is a schematic plan view showing a silver reflecting sheet 209 according to the third embodiment of the present invention.

As shown in FIG. 10, the silver reflective sheet 209 according to the third embodiment of the present invention has a gray or black antireflection film 280 formed by printing in a region to which the double-sided tape 210 is adhered.

Therefore, in the liquid crystal display module according to the third embodiment of the present invention, the irradiation light incident on the gray or black antireflection film 280 from the cold cathode fluorescent lamp 208 is applied to the antireflection film 2.
Since the light is absorbed by 80, the amount of irradiation light entering the light guide plate 251 from the surface of the light guide plate 251 facing the diffusion sheet 253 as shown in FIG. 6C is reduced.

The double-sided tape 21 is made incident on the light guide plate 251 from the surface of the light guide plate 251 which faces the cold cathode tubes 208.
The irradiation light scattered at 0 is also absorbed by the antireflection film 280.

Therefore, in the liquid crystal display module according to the third embodiment of the present invention, it is possible to more effectively prevent the generation of bright lines in the display screen of the liquid crystal display panel 100.

In the liquid crystal display module according to the third embodiment of the present invention, the cold cathode tube 25 of the reflection sheet 252 is used.
The reflection sheet 252 may be provided such that one end on one side projects toward the cold cathode tube 208 side from one end on the cold cathode tube 208 side of the light guide plate 251.

Further, the double-sided tape 210 may be arranged so as to project from one end of the light guide plate 251 on the cold cathode tube 208 side to the cold cathode tube 208 side.

As shown in FIG. 11, the antireflection film 280 has a length (L30) of 0.5 to 2 mm from one end of the silver reflection sheet 209 on the cold cathode tube 208 side, and the antireflection film 280. Is to project from one end of the light guide plate 251 on the cold cathode tube 208 side to the cold cathode tube 208 side,
The protruding length (L32) is formed so as not to exceed 1 mm.

When the gray or black antireflection film 280 is formed on the silver reflection sheet 209 by printing, the reflectance of the antireflection film 280 is adjusted by changing the density of the ink. The ratio of the absorbed irradiation light can be changed, so that even if the brightness (luminance) of the display screen of the liquid crystal display panel 100 differs, the cold cathode fluorescent lamp 5 can be displayed in the display screen of the liquid crystal display panel 503.
It is possible to adjust the brightness (luminance) of the area close to the upper frame 521 on the side where the 28 is stored.

[Fourth Embodiment of the Invention] FIG. 12 shows the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module according to the fourth embodiment of the present invention. It is sectional drawing shown in detail.

The liquid crystal display module according to the fourth embodiment of the present invention is a rectangular parallelepiped light guide plate 2 instead of the wedge-shaped light guide plate 251 in the liquid crystal display module according to the third embodiment of the present invention.
61 is used.

Also in the liquid crystal display module according to the fourth embodiment of the present invention, it is possible to prevent bright lines from being generated in the liquid crystal display panel 100.

In each of the embodiments of the present invention, in order to narrow the frame area of the liquid crystal display module,
An IC mounted in a tape carrier package 300 arranged on the upper side (or lower side) of the liquid crystal display panel 100.
From the end of the chip 301 on the liquid crystal display panel 100 side to the IC
The distance (L1) to the output side bonding pad 304b of the chip 301 is the drive circuit board 2 of the IC chip 301.
It is made larger than the distance (L2) from the end on the 04 side to the input side bonding pad 304a of the IC chip 301.

FIG. 13 is a schematic plan view of an example of the tape carrier package 300 in each of the embodiments of the present invention, and FIG. 14 is a schematic sectional view of the tape carrier package shown in FIG.

In FIGS. 13 and 14, reference numeral 302 is an input side wiring section of the IC chip 301, and 303 is an output side wiring section of the IC chip 301.

An input side bonding pad 304a of the IC chip 301 is provided at the inner tip portion (inner lead) of the input side wiring portion 302, and an output side bonding pad is provided at the inner tip portion of the output side wiring portion 303. 304b is connected by a so-called face-down bonding method.

Here, the input side wiring section 302 and the output side wiring section 303 are made of, for example, copper (Cu).

At the outer tip of the input side wiring section 302,
The terminal portion of the drive circuit board is connected by soldering or the like, and the terminal portion 23 of the liquid crystal display panel 100 is connected to the outer end of the output side wiring portion 303 by an anisotropic conductive film.

Here, as shown in FIG. 13, the input side wiring portion 302 and the output side wiring portion 303 are slanted in order to match the pitches at the respective tip portions of the input side wiring portion 302 and the output side wiring portion 303. Wiring portions (309a, 309b) are provided.

Reference numeral 305 is, for example, a base film made of polyimide or the like having an opening 307, and the base film 305 and the input side wiring section 302 and the output side wiring section 303 are bonded by an adhesive. .

Reference numeral 308 is a thermosetting resin (resin) that protects the IC chip 301.

Incidentally, this thermosetting resin (resin) 308
Are omitted in FIG.

Tape carrier package 3 shown in FIG.
00, the IC chip 301 is made to overlap with the opening 307 of the base film 305 in the peripheral portion thereof, and the output side bonding pad 304b of the IC chip 301 is connected to the wiring portion (input side wiring) of the carrier package 300. Section 302 and output side wiring section 303)
Is provided in the central portion in the wiring direction.

As a result, in the tape carrier package 300 shown in FIG. 13, the IC chip 301 starts from the end of the IC chip 301 on the liquid crystal display panel 100 side (the outer tip side of the output side wiring section 303 of the tape carrier package 300). The distance (L1) to the output side bonding pad 304b of the drive circuit board 204 of the IC chip 301.
Side (input side wiring section 3 of tape carrier package 300)
Distance from the end on the outer side of 02) to the input side bonding pad 304a of the IC chip 301 (L2)
Be made larger.

FIG. 15 is a block diagram showing a schematic circuit configuration of an IC chip mounted in a tape carrier package of a conventional simple matrix type liquid crystal display module.

As shown in FIG. 15, the IC chip mounted in the tape carrier package of the conventional liquid crystal display module includes a shift register circuit 511, a bit latch circuit 512, a line latch circuit 513, and a selector circuit 51.
4, output buffer circuit 515, random logic circuit 5
It consists of ten.

In this IC chip, display data and display control signals (clock (CL1, CL2), alternating signal (M), etc.) are supplied from a display control circuit (not shown) to a power supply circuit (not shown). The data signal line drive voltage is input from.

The shift register circuit 511 is provided with a display data latch clock (CL
Based on 2), the data latch signal for the bit latch circuit 512 is generated and output to the bit latch circuit 512.

The bit latch circuit 512 latches 8-bit display data (Din) input from the display control device on the basis of the data fetching signal input from the shift register circuit 511.

The line latch circuit 513 latches the display data fetched by all the bit latch circuits 512 based on the output timing control clock (CL1) and outputs it to the selector circuit 514.

The selector circuit 514 converts the voltage level of the display data input from the line latch circuit 513 into a high voltage level for driving the liquid crystal and outputs the output buffer circuit 51.
5 is output.

The output buffer circuit 515 is supplied with a 4-level data signal line drive voltage from the power supply circuit,
The output buffer circuit 515 is supplied from the power supply circuit 4
One of the level data signal line drive voltages is selected based on the high voltage level display data and the alternating signal (M) input from the selector circuit 514, and is selected for each segment electrode (data signal line). Output.

When the tape carrier package having the IC chip mounted is arranged on the upper side of the liquid crystal display panel,
Since the output terminals of the output buffer circuit 515 are horizontally inverted when arranged below the liquid crystal display panel, the data signal line drive voltage from the output buffer circuit output to each segment electrode needs to be horizontally inverted. .

Random logic circuit 510 shown in FIG.
Is an output buffer circuit 5 output to each segment electrode.
Left and right inversion (SHL) of data signal line drive voltage from 15
When performing, the 8-bit display data (Din) input from the display control device is rearranged.

Here, in the inside of the IC chip mounted in the tape carrier package of the conventional liquid crystal display module, each circuit shown in FIG. 15 is arranged along the flow of signals (data), that is, the input of the IC chip. Side bonding pad,
Random logic circuit 510, shift register circuit 51
1, bit latch circuit 512, line latch circuit 51
3, the selector circuit 514, the output buffer circuit 515, and the output side bonding pad are provided in this order.

FIG. 16 shows the wiring pattern of the tape carrier package 300 shown in FIG. 13 and the IC chip 30 mounted on the tape carrier package 300 shown in FIG.
It is a figure which shows also with the schematic internal circuit structure of 1.

As shown in FIG. 16, the IC chip 30 mounted on the tape carrier package 300 shown in FIG.
The internal circuit of No. 1 is not provided along the flow of signals (data), and as shown in FIG. 16, the random logic circuit 310, the input side bonding pad 304a, the shift register circuit / bit latch circuit 311, the output side. The bonding pad 304b, the output buffer circuit 312, and the line latch circuit / selector circuit 313 are provided in this order.

When the display screen size of a liquid crystal display device such as a simple matrix type liquid crystal display module is increased, the pitch size of the tip portion outside the output side wiring portion 303 of the tape carrier package 300 is increased, and the output of the tape carrier package 300 is increased. Diagonal wiring part 3 of the side wiring part 303
The wiring length (L0) of the wiring 09b is increased.

This is the same even if the chip size of the IC chip 301 is reduced and the pitch size of the inner tip of the output side wiring section 303 of the tape carrier package 300 is reduced.

However, in the tape carrier package 300 shown in FIG. 13, the output side bonding pad 304b of the IC chip 301 is provided in the central portion of the wiring portion of the tape carrier package 300 in the wiring direction. It is possible to increase the distance (L1) from the end on the liquid crystal display panel 100 side to the output side bonding pad 304b of the IC chip 301.

Thus, the tape carrier package 3
00, the oblique wiring portion 309b of the output side wiring portion 303 is an IC.
Since it can be provided at a position overlapping with the chip 301 and can be accommodated between the output side bonding pad 304b of the IC chip 301 and the outer tip of the output side wiring portion 303 of the tape carrier package 300,
The width of the tape carrier package 300 in the wiring portion direction can be reduced (TCP width; L10).

Further, when the tip portion inside the input side wiring portion 302 and the tip portion inside the output side wiring portion 303 of the tape carrier package 300 are formed by etching, a predetermined etching space is provided between the respective tip portions. Input side bonding pad 3 of IC chip 301
A predetermined interval is required between the first bonding pad 04a and the output-side bonding pad 304b.

However, in the tape carrier package 300 shown in FIG. 13, the shift register circuit / bit latch circuit 311 is arranged between the input side bonding pad 304a and the output side bonding pad 304b of the IC chip 301. , IC chip 30
1 can be effectively used to reduce the width of the IC chip 301 in the wiring portion direction of the tape carrier package 300.

FIG. 17 is a diagram showing a wiring pattern of another example of the tape carrier package 300 in each of the embodiments of the present invention and a schematic internal circuit configuration of the IC chip 321 mounted thereon.

Tape carrier package 3 shown in FIG.
00, the IC chip 321 is made to overlap the opening of the base film 305 in its peripheral portion, and as shown in FIG. 17, the output side bonding pad 304b of the IC chip 321 is connected to the wiring of the tape carrier package 300. IC chip 3 from the center in the wiring direction
21 on the side of the drive circuit board 204 (on the outer end side of the input side wiring section 302 of the tape carrier package 300),
Input side bonding pad 304a of the IC chip 321
Is provided in the vicinity.

In accordance therewith, the IC chip 32 mounted on the tape carrier package 300 shown in FIG.
The internal circuit of No. 1 is not provided along the flow of signals (data), and as shown in FIG. 17, the random logic circuit 310, the input side bonding pad 304a, the output side bonding pad 304b, and the output buffer circuit 31.
2, a line latch circuit / selector circuit 313, a shift register circuit / bit latch circuit 311 are provided in this order.

Tape carrier package 3 shown in FIG.
00, the liquid crystal display panel 1 of the IC chip 321
The distance (L1) from the end on the 00 side to the output side bonding pad 304b of the IC chip 321 is the IC chip 3
21 from the end on the drive circuit board 204 side of the IC chip 32
1 to the input side bonding pad 304a (L
2) It is made larger.

Thus, the tape carrier package 3
00, the diagonal wiring portion 309b of the output side wiring portion 303 is
From the output side bonding pad 304b of the C chip 321 to the output side wiring portion 30 of the tape carrier package 300.
3 can be accommodated up to the outer end of the tape carrier package 300, and the width of the tape carrier package 300 in the wiring direction (TC
It is possible to narrow the P width; L10).

Therefore, by using the tape carrier package 300 shown in FIG. 17, the width of the upper and lower outer frame regions of the liquid crystal display module (LCM) can be narrowed.

FIG. 18 is a diagram showing a wiring pattern of another example of the tape carrier package 300 in each of the embodiments of the present invention and a schematic internal circuit configuration of the IC chip 331 mounted thereon.

The tape carrier package 3 shown in FIG.
00, the IC chip 331 is made to overlap the opening of the base film 305 in its peripheral portion, and as shown in FIG. 18, the output side bonding pad 304b of the IC chip 331 is connected to the wiring of the tape carrier package 300. IC chip 3 from the center in the wiring direction
31 on the side of the drive circuit board 204 (outer end side of the input side wiring section 302 of the tape carrier package 300),
Input side bonding pad 304a of the IC chip 331
It is installed in the same position as.

Further, accordingly, the IC chip 33 mounted on the tape carrier package 300 shown in FIG.
The internal circuit of No. 1 is not arranged along the flow of signals (data), but as shown in FIG.
10, input side bonding pad 304a and output side bonding pad 304b, output buffer circuit 31
2, a line latch circuit / selector circuit 313, a shift register circuit / bit latch circuit 311 are provided in this order.

Tape carrier package 3 shown in FIG.
00, the liquid crystal display panel 1 of the IC chip 331
The distance (L1) from the end on the 00 side to the output side bonding pad 304b of the IC chip 331 is the IC chip 3
The IC chip 33 from the end of the drive circuit board 204 side of 31
1 to the input side bonding pad 304a (L
2) It is made larger.

As a result, the tape carrier package 3
00, the diagonal wiring portion 309b of the output side wiring portion 303 is
From the output side bonding pad 304b of the C chip 331 to the output side wiring portion 30 of the tape carrier package 300.
It is possible to fit it between the outer tip of 3 and
The width of the tape carrier package 300 in the wiring direction (T
CP width; L10) can be reduced.

Therefore, by using the tape carrier package 300 shown in FIG. 18, it is possible to narrow the width of the frame area other than the display area of the liquid crystal display module (LCM).

Further, the tape carrier package 300 shown in FIG. 18 does not require a space for installing the output side bonding pad 304b, so that the IC chip 3 is used.
The width of 31 can be made small, and by using the tape carrier package 300 shown in FIG. 18, the width of the frame area other than the display area of the liquid crystal display module (LCM) can be made narrower.

Furthermore, in the embodiment of the present invention, the case where the present invention is applied to the STN type simple matrix type liquid crystal display panel has been described, but the present invention is not limited to this, and the present invention is a TFT type. Needless to say, it can be applied to the active type liquid crystal display panel.

As described above, the invention made by the present inventors is described below.
Although specifically described based on the embodiments of the present invention, the present invention is not limited to the embodiments of the present invention, and it is needless to say that various modifications can be made without departing from the gist of the present invention. .

[0145]

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

(1) According to the present invention, the irradiation light reflected by the reflection sheet provided around the light source and incident on the light guide plate assembly from the surface of the light guide plate assembly on the liquid crystal display panel side is reflected. Since the anti-reflection film provided at the end of the sheet that overlaps with the surface of the light guide plate assembly on the liquid crystal display panel side absorbs the light, the surface of the liquid crystal display panel of the light guide plate assembly is changed to the light guide plate assembly. It is possible to prevent the incident irradiation light from being applied to the liquid crystal display panel side.

(2) According to the present invention, even if the frame area of the liquid crystal display device is narrowed, it is possible to prevent the generation of bright lines in the display screen of the liquid crystal display panel.

[Brief description of drawings]

FIG. 1 is a color STN (Super Twisted) according to an embodiment of the present invention (Embodiment 1).
FIG. 3 is an exploded perspective view showing components of a liquid crystal display panel used in a (d Nematic) type simple matrix type liquid crystal display module.

FIG. 2 is a sectional view of a main part of the liquid crystal display panel shown in FIG.

FIG. 3 is a schematic sectional view of a peripheral portion of the liquid crystal display module (LCM) according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing in more detail the correspondence relationship between the cold cathode tubes 208, the silver reflective sheet 209, and the light guide plate assembly 207 of the liquid crystal display module according to Embodiment 1 of the present invention.

FIG. 5 is a schematic plan view showing a reflection sheet 252 according to Embodiment 1 of the present invention.

FIG. 6 is a diagram for explaining the reason why a bright line is generated by narrowing a frame region other than the display region of the liquid crystal display module.

FIG. 7 is a diagram showing a specific example of an antireflection film 270 according to the first embodiment of the present invention.

FIG. 8 is a cross-sectional view showing in more detail the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module according to the second embodiment of the present invention.

FIG. 9 is a cross-sectional view showing in more detail the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module according to the third embodiment of the present invention.

FIG. 10 is a reflective projection sheet 209 according to Embodiment 3 of the present invention.
It is a schematic plan view showing.

FIG. 11 is a diagram showing a specific example of the prevention / prevention film 280 according to the third embodiment of the present invention.

FIG. 12 is a cross-sectional view showing in more detail the correspondence relationship between the cold cathode tubes 208, the silver reflection sheet 209, and the light guide plate assembly 207 in the simple matrix type liquid crystal display module of Embodiment 4 of the present invention.

FIG. 13 is a schematic plan view of an example of the tape carrier package 300 according to each of the embodiments of the present invention.

14 is a schematic cross-sectional view of the tape carrier package shown in FIG.

FIG. 15 is a block diagram showing a schematic circuit configuration of an IC chip mounted in a tape carrier package of a conventional simple matrix type liquid crystal display module.

16 is a tape carrier package 30 shown in FIG.
It is a figure which shows together the wiring pattern of 0, and the schematic internal circuit structure of the IC chip 301 mounted in the tape carrier package 300 shown in FIG.

FIG. 17 is a diagram showing a wiring pattern of another example of the tape carrier package 300 in each of the embodiments of the present invention and a schematic internal circuit configuration of an IC chip 321 mounted thereon.

FIG. 18 is a diagram showing together a wiring pattern of another example of the tape carrier package 300 in each of the embodiments of the present invention, and a schematic internal circuit configuration of an IC chip 331 mounted thereon.

FIG. 19 is an exploded perspective view showing components of a conventional color STN type simple matrix type liquid crystal display module (LCM) which is one of the simple matrix type liquid crystal display devices.

20 is an exploded perspective view showing components of the light guide plate assembly 527 shown in FIG.

21 is a plan view of a liquid crystal display panel 503 around which the drive circuit board 524 shown in FIG. 19 is mounted.

[Explanation of symbols]

1, 2, glass substrate, 3 light-shielding film, 4a, 4b, 4c
R (red), G (green), B (blue) color filters, 5: protective film, 6, 7: alignment film, 8: spacer, 9:
Sealing material, 10: liquid crystal layer, 11, 12: polarizing plate, 13,
13a, 13b, 13c ... Segment electrode, 14 ... Common electrode, 15 ... Retardation plate, 23, 24 ... Terminal part, 100
... Liquid crystal display panel, 110 ... Common electrode substrate, 120 ...
Segment electrode substrate, 201, 521 ... Upper frame,
204, 524, 524a, 524b, 524c ... Driving circuit board, 205, 525 ... Mold, 206, 526
... Prism sheet, 207, 527 ... Light guide plate assembly, 2
08,528 ... Cold cathode tubes, 209, 529 ... Silver reflection sheet, 210 ... Double-sided tape, 212, 532 ... Lower frame, 251, 551 ... Light guide plate, 252, 552 ... Reflection sheet, 253, 553 ... Diffusion sheet, 254 ... Dot pattern, 270, 280 ... Antireflection film, 300, 53
5,535a, 535b, 535c ... Tape carrier package, 301, 321, 331, 537a, 537
b, 537c ... IC chip (semiconductor chip), 302 ...
Input side wiring part, 303 ... Output side wiring part, 304a ... Input side bonding pad, 304b ... Output side bonding pad, 305 ... Base film, 307 ... Opening part, 3
08 ... Thermosetting resin (resin), 309a, 309b ...
Diagonal wiring part, 310, 510 ... Random logic circuit,
311 ... Shift register circuit / bit latch circuit, 31
2, 515 ... Output buffer circuit, 313 ... Line latch circuit / selector circuit, 511 ... Shift register circuit, 5
12 ... Bit latch circuit, 513 ... Line latch circuit,
514 ... Selector circuit, 522 ... Silicon spacer, 5
32 ... Rod spacer, 530 ... Rubber bush, 536 ... Flat cable.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hirotsugu Muramatsu 3350 Hayano, Mobara-shi, Chiba Hitachi Electric Devices Co., Ltd.

Claims (5)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal display panel having a liquid crystal layer injected and sealed between a pair of electrode substrates; and a backlight for irradiating the liquid crystal display panel with irradiation light. The light includes a light source, a light guide plate assembly having one side surface facing the light source, a light source surrounding the light source so as to cover the light source, and both ends of the light guide plate assembly on the light source side. In a liquid crystal display device having a reflection sheet provided so as to overlap the portion, the reflection sheet overlaps a surface of the light guide plate assembly on the liquid crystal display panel side of a reflection surface that reflects irradiation light from the light source. A liquid crystal display device having a gray or black antireflection film on the side end. 2. An end surface of the antireflection film on the light source side,
The liquid crystal display device according to claim 1, wherein the light guide plate assembly is aligned with an end of the light guide plate assembly on the light source side. 3. An end surface of the antireflection film on the light source side,
The liquid crystal display device according to claim 1, wherein the light guide plate assembly protrudes from the light source side end portion toward the light source side. 4. The liquid crystal display device according to claim 1, wherein the gray or black antireflection film is formed by printing. 5. The liquid crystal according to claim 4, wherein the reflectance of the antireflection film is adjusted by changing the ink density when the gray or black antireflection film is formed by the printing. Display device.