JPH08278502A - LCD display panel - Google Patents

Abstract

(57) [Abstract] [Purpose] A liquid crystal display panel that improves the display quality of the liquid crystal display panel by preventing the light emitted from the backlight from passing through the protective film and leaking to the display surface of the liquid crystal display panel. I will provide a. [Structure] Two electrode substrates (110, 120) having transparent electrodes (160, 170) formed on one surface, a sealing material (140), and transparent electrodes facing each other with the sealing material sandwiched therebetween. A liquid crystal layer (130) which is injected and sealed between two stacked electrode substrates, a transparent electrode exposed to the outside from the sealing material of the two electrode substrates, and an exposed portion of the sealing material. In the liquid crystal display panel having the formed protective layer (140), the protective layer is colored black.

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 panel, and more particularly to a liquid crystal display panel which prevents light leakage from a backlight or forgetting to apply a protective film.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional TFT (Thin Fi).
FIG. 3 is a perspective view showing a schematic configuration of a liquid crystal display panel and a peripheral portion thereof in an lm Transistor) type liquid crystal display module.

In FIG. 1, 100 is a TFT liquid crystal display panel, 110 is a color filter substrate, 120 is a TFT substrate, 210 and 220 are drive circuit boards, and 230 is an electrical connection between the drive circuit board 210 and the drive circuit board 220. Are flat cables, 310, 320, 330 are tape carrier packages, and 311, 321, 331 are drive IC chips for driving the TFT liquid crystal display panel 100.

Driving IC chips 311, 321, 331
Is the tape automated bonding method (TA
According to B), the tape carrier packages 310, 320,
It is implemented in 330.

Driving IC chips 311, 321, 331
Form a drain driver or a gate driver of the TFT liquid crystal display panel 100.

At least two of the TFT liquid crystal display panel 100
The drive circuit boards 210 and 220 are arranged on the sides, and the TFT liquid crystal display panel 100 further includes two electrode boards including a color filter board 110 and a TFT board 120.

Although not shown, color filters for R, G, B, a light-shielding film, a protective film, a common electrode, and an alignment film are sequentially formed on the color filter substrate 110.

Although not shown, a gate signal line, a drain signal line, and a thin film transistor portion including a thin film transistor (TFT), a pixel electrode, a protective film, and an alignment film are sequentially formed on the TFT substrate 120. .

FIG. 2 is a sectional view showing a schematic sectional structure of a portion "A" in the liquid crystal display panel shown in FIG.

FIG. 3 is a sectional view showing a schematic sectional structure of a portion "B" in the liquid crystal display panel shown in FIG.

2 and 3, 110 is a color filter substrate, 120 is a TFT substrate, 130 is a liquid crystal layer, and 14 is a liquid crystal layer.
0 is an epoxy resin adhesive, 150 is a sealing material, 160,
170 is a transparent electrode and 180 and 190 are glass substrates.

The transparent electrode 160 constitutes a common electrode, and the transparent electrode 170 constitutes a drain signal line.

Color filter substrate 110 and TFT substrate 1
20 is a transparent electrode (180, 19
0) are overlapped so as to face each other, and the sealing material 150
Liquid crystal is injected from the filling port of.

In FIG. 2, color filters for R, G, B and a light shielding film formed on the glass substrate 180,
The protective film and the alignment film are omitted.

Similarly, in FIG. 3, the thin film transistor portion, the pixel electrode, the protective film, and the alignment film formed on the glass substrate 190 are omitted.

As shown in FIGS. 2 and 3, the TFT substrate 12
Transparent electrode 190 outside the sealing material 150, the side surface of the color filter substrate 110, the color filter substrate 1
Transparent electrode 180 outside the sealing material 150 of 10,
Further, an epoxy resin adhesive 140, which is a protective film, is adhered and formed on the exposed portion of the sealing material 150.

The liquid crystal display panel 100 is constructed by adhering the color filter substrate 110 and the TFT substrate 120 with the sealing material 150. However, since the sealing material 150 does not have a strong adhesive force, the epoxy resin adhesive 140 is used. The adhesive strength between the color filter substrate 110 and the TFT substrate 120 is reinforced.

Further, the epoxy resin adhesive 140 improves the moisture resistance and prevents the electric field corrosion of the transparent electrodes 180 and 190 outside the sealing material 150 due to dust and humidity from the outside.

[0019]

However, in the structure shown in FIGS. 2 and 3, the epoxy resin adhesive 14 is used.
Since 0 is transparent, there is a problem that it is difficult to detect the application error of the epoxy resin adhesive 140 when the application error is left.

Further, the irradiation light from the backlight is transmitted through the epoxy resin adhesive 140, and the liquid crystal display panel 10
There is a problem that light leakage occurs on the display surface of 0 and the display quality of the liquid crystal display panel 100 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 enable easy detection of forgetting to apply a protective layer in a liquid crystal display panel. To provide the technology.

Another object of the present invention is to prevent the irradiation light from the backlight from leaking to the display surface of the liquid crystal display panel through the protective film in the liquid crystal display panel.
An object of the present invention is to provide a technique capable of improving the display quality of a liquid crystal display panel.

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

[0024]

Of the inventions disclosed in the present application, a representative one will be briefly described below.
It is as follows.

(1) A transparent electrode is formed on one surface 2
At least two electrode substrates, a sealing material, and a liquid crystal layer injected and sealed between the two electrode substrates stacked so that the transparent electrodes face each other with the sealing material sandwiched therebetween. In a liquid crystal display panel having a transparent electrode exposed to the outside of the sealing material of an electrode substrate and a protective layer formed on an exposed portion of the sealing material, the protective layer is colored. To do.

(2) The means of (1) above is characterized in that the protective layer is colored black.

[0027]

According to the above-mentioned means (1), in the liquid crystal display panel, the colored protective layer is provided on the transparent electrodes exposed to the outside from the sealing material of at least two electrode substrates and the exposed portion of the sealing material. Since the coating is formed, it is possible to easily detect that the protective layer has not been applied.

According to the above means (2), the protective layer is colored black in the liquid crystal display panel.
It is possible to prevent light emitted from the backlight from passing through the protective film and leaking to the display surface of the liquid crystal display panel, and prevent deterioration of display quality of the liquid crystal display panel.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a TFT type liquid crystal display module will be described below in detail with reference to the drawings.

In all the drawings for explaining the embodiments, parts having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted.

The schematic constitution of the liquid crystal display panel and its peripheral portion in the TFT type liquid crystal display module of this embodiment is as follows.
Since the liquid crystal display panel and its peripheral portion in the conventional TFT type liquid crystal display module shown in FIGS. 1 to 3 have the same general configuration, detailed description thereof will be omitted.

In this embodiment, the epoxy resin adhesive 140 which is the protective layer shown in FIGS. 2 and 3 contains a pigment which is a coloring material.

As a coloring material, for example, a black coloring material such as carbon is used as a coloring material in order to block the irradiation light from the backlight which passes through the epoxy resin adhesive 140 and prevent the deterioration of the display quality of the liquid crystal display panel. Select.

Further, the colorant is not limited to black and any color may be used as long as it is necessary to detect the application failure of the epoxy resin adhesive 140.

Next, the effect of this embodiment will be described with reference to FIGS.

FIG. 4 is a diagram for explaining a mounting state of a conventional TFT type liquid crystal display module.
It is a sectional view showing a partial schematic section structure of an FT type liquid crystal display module.

In FIG. 4, 110 is a color filter substrate, 120 is a TFT substrate, 140 is an epoxy resin adhesive, 400 is a mold, 410 is a backlight, and 420 is.
Is a shield case, 430 is a light shielding member, 440 is a spacer, and 450 is irradiation light.

The conventional TFT type liquid crystal display module is constructed by stacking the mold 400, the backlight 410, the liquid crystal display panel 100, and the shield case 420 in an arrangement relationship as shown in FIG.

Further, in the conventional TFT type liquid crystal display module, the irradiation light from the backlight 410 passes through the epoxy resin adhesive 140 and the liquid crystal display panel 1
The light blocking member 430, for example, a rubber cushion for light blocking is inserted between the epoxy resin adhesive 140 and the backlight 410 in order to prevent the light from leaking to the display surface.

However, in the conventional TFT type liquid crystal display module, when the insertion position of the light shielding member 430 is displaced, the light emitted from the backlight 410 passes through the epoxy resin adhesive 140 and the liquid crystal display is displayed. It leaks to the display surface of the panel 100 and deteriorates the display quality.

FIG. 5 is a diagram for explaining that in the conventional TFT type liquid crystal display module, the display quality of the liquid crystal display panel is deteriorated due to the displacement of the insertion position of the light shielding member 430.

In the conventional TFT type liquid crystal display module, when the insertion position of the light shielding member 430 is displaced, the light emitted from the backlight 410 passes through the epoxy resin adhesive 140 as shown in FIG. Then, it leaks from between the shield case 420 and the TFT substrate 120 to the display surface of the liquid crystal display panel 100.

The leakage irradiation light 460 causes the periphery of the display surface of the liquid crystal display panel 100 to be displayed when the display surface of the liquid crystal display panel 100 displays black or depending on the viewing angle of the display surface of the liquid crystal display panel 100. Emits bright light, which causes deterioration of display quality.

However, according to the first embodiment, since the epoxy resin adhesive 140 is made to contain the black coloring material such as carbon, the irradiation light from the backlight 410 is transmitted through the epoxy resin adhesive 140. It is possible to prevent the display quality of the liquid crystal display panel 100 from deteriorating.

Further, according to the first embodiment, it is possible to easily detect that the epoxy resin adhesive 140 is left unpainted.

In the present embodiment, the case where the present invention is applied to the liquid crystal display panel has been described, but the present invention is not limited to this, and is applied to a simple matrix type liquid crystal display panel such as a color STN liquid crystal display panel. It goes without saying that it is possible.

Although the present invention has been specifically described based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention.

[0048]

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

(1) According to the present invention, a colored protective layer is formed by depositing on the transparent electrodes and the exposed portions of the sealing material exposed to the outside from the sealing material of at least two electrode substrates. Therefore, it becomes possible to easily detect that the protective layer has not been painted.

(2) According to the present invention, a black colored protective layer is formed on the transparent electrodes exposed to the outside from the sealing material of at least two electrode substrates and the exposed portion of the sealing material. By doing so, it becomes possible to prevent the irradiation light from the backlight from passing through the protective layer and deteriorating the display quality of the liquid crystal display panel.

As a result, it is possible to omit the light-shielding member conventionally required and to simplify the manufacturing process of the liquid crystal display panel.

[Brief description of drawings]

FIG. 1 is a conventional TFT (Thin Film Tran).
FIG. 3 is a perspective view showing a schematic configuration of a liquid crystal display panel and its peripheral portion in a liquid crystal display module of a system).

FIG. 2 is a sectional view showing a schematic sectional structure of a portion “A” in the liquid crystal display panel shown in FIG.

3 is a sectional view showing a schematic sectional structure of a portion "B" in the liquid crystal display panel shown in FIG.

FIG. 4 is a sectional view showing a partial schematic sectional structure of a conventional TFT type liquid crystal display module.

FIG. 5 is a diagram for explaining that in a conventional TFT type liquid crystal display module, the display quality of the liquid crystal display panel is deteriorated due to the displacement of the insertion position of the light shielding member 430.

[Explanation of symbols]

100 ... TFT liquid crystal display panel, 110 ... Color filter substrate, 120 ... TFT substrate, 130 ... Liquid crystal layer, 140
… Epoxy resin adhesive, 150… Sealant, 160,1
70 ... Transparent electrode, 180, 190 ... Glass substrate, 21
0, 220 ... Driving circuit board, 230 ... Flat cable, 310, 320, 330 ... Tape carrier package, 311, 321, 331 ... Driving IC chip, 400
... Mold, 410 ... Backlight, 420 ... Shield case, 430 ... Light blocking member, 440 ... Spacer, 45
0 ... Irradiation light from the backlight 410, 460 ... Leakage irradiation light from the backlight 410.

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

Claims (2)

[Claims] 1. A two-electrode substrate having a transparent electrode formed on one surface thereof, a sealing material, and the two electrode substrates stacked so that the transparent electrodes face each other with the sealing material sandwiched therebetween. A liquid crystal display having a liquid crystal layer injected and sealed in between, a transparent electrode exposed to the outside from the sealing material of at least the two electrode substrates, and a protective layer formed on the exposed portion of the sealing material. A liquid crystal display panel, wherein the protective layer is colored. 2. The liquid crystal display panel according to claim 1, wherein the protective layer is colored black.