JPH10161146A - Liquid crystal display pannel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect the picture element part and the signal transmission electrode part of a liquid crystal display pannel from electrostatic distruction so as to obtain the high display definition liquid crystal display pannel with high reliability by forming an auxiliary terminal electrode for usage except signal transmission in a conductive line electrode part which connects a signal input terminal to a picture element electrode inside a transparent substrate. SOLUTION: A signal transmission line electrode 19 is constituted of the picture element electrode 1, a signal input terminal electrode 2 and the conductive line electrode part 3 for connecting the signal input terminal electrode 2 and the signal input terminal electrode 2. The auxiliary terminal electrode 4 is provided in a position where it is crossed with a seal material 12 apart from the signal transmission line electrode 19 on the liquid crystal display pannel 17 with an anti-elecrostaticity policy as a purpose and auxiliary terminal connecting electrode 5a and 5b branching in two are connected to the signal transmission line electrode 19 inside the seal material 12 from the auxiliary terminal electrode 4. Thus, even at the time of electrostaticity occurrence, its electric charge is concentrated in the auxiliary terminal electrode 4 so as to be preferentially electrode-distructed and the picture element part and the signal transmission electrode part are protected from the influence of electrostaticity.

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 in which electrostatic damage is prevented.

[0002]

2. Description of the Related Art A liquid crystal display device using a liquid crystal display panel can be driven at a lower voltage, is more suitable for LSI driving, has lower power consumption, and is thinner than other conventional display devices. , Because it is possible to reduce the weight
It is used for many electric appliances including V and OA equipment, and an example thereof will be described below with reference to the drawings.

FIG. 2 is a cross-sectional view showing an example of a general liquid crystal display device, and its main components are a liquid crystal display panel 17, a drive circuit section 20, and a connector 15. LCD panel
Reference numeral 17 denotes a connection between the first glass substrate 13 on which the first transparent electrode 8a and the alignment film 9a are formed and the second glass substrate 14 on which the second transparent electrode 8b and the alignment film 9b are formed via the spacer 10. It is fixed by a sealing material 12 containing a material, and a liquid crystal 11 is sealed between the two glass substrates 13 and 14 by an injection method or a dropping method. The thickness of each of the glass substrates 13 and 14 is about 1 mm, and the interval between the two glass substrates 13 and 14 is about 6 microns. After the liquid crystal 11 is sealed, the polarizing plate 6 with the protective sheet 7 is attached on the two glass substrates 13 and 14. In addition,
The drive circuit section 20 includes a printed circuit board 16 and a liquid crystal drive LSI 18.

[0004] The liquid crystal display panel thus manufactured
17 is exposed to electrostatic stress during the manufacturing process, and especially in the final quality inspection process, since it is largely determined by human visual inspection, the protective sheet 7 on the polarizing plate 6 is peeled off every time the inspection is performed. The work of sticking is frequently repeated, and quality inspection is performed.

[0005]

However, peeling or affixing the protective sheet 7 as an insulating sheet in the course of the process in this way leads to generation of a large amount of static electricity, and this large amount of static electricity is generated. When it reaches the pixel electrode, the signal input terminal electrode, and the conductor electrode portion in the liquid crystal display panel 17, a display defect such as a decrease in contrast or destruction of the electrode is caused. In fact, most of the failure factors at the time of manufacturing a liquid crystal display panel are caused by static electricity.

The present invention solves the above-mentioned conventional problems, and provides a highly reliable and high display quality liquid crystal display panel which protects a pixel portion and a signal transmission electrode portion of the liquid crystal display panel from electrostatic damage. The purpose is to do.

[0007]

According to the liquid crystal display panel of the present invention, a signal transmission terminal connected to a pair of transparent substrates in the liquid crystal display panel is connected to a conductive wire electrode portion connecting to a pixel electrode in the transparent substrate. An auxiliary terminal electrode other than the intended purpose is formed.

According to the present invention, even when static electricity is generated, the electric charge concentrates on the auxiliary terminal electrode and is preferentially destroyed, thereby protecting the pixel portion and the signal transmission electrode portion from the influence of the static electricity. A liquid crystal display panel which can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals are used for parts common to those in FIG. FIG. 1A is an external plan view showing a configuration of a liquid crystal display panel according to an embodiment of the present invention, and FIG. 1B is a partially enlarged plan view thereof. In each figure, 1 is a pixel electrode, 2
Is a signal input terminal electrode, and 3 is a conductive wire electrode portion connecting the signal input terminal electrode 2 and the pixel electrode 1. These constitute a signal transmission line electrode 19. 4 is an auxiliary terminal electrode, 5
Reference numerals a and 5b denote auxiliary terminal connection electrodes, and reference numeral 12 denotes a sealing material, both of which are provided on the liquid crystal display panel 17. Other structures around the liquid crystal display panel are basically the same as those described with reference to FIG. The auxiliary terminal electrode 4 is a signal transmission line electrode 19 on the liquid crystal display panel 17 for the purpose of countermeasures against static electricity.
Apart from this, the auxiliary terminal electrode 4 is provided at a position that does not affect the display, for example, at a position that intersects with the sealing material 12.
The auxiliary terminal connection electrodes 5 a and 5 b branched from the first through the second are connected to the signal transmission line electrode 19 inside the sealing material 12. The shape of the auxiliary terminal connection electrodes 5a and 5b is set so that the area resistance ratio between the area resistance of the auxiliary terminal electrode 4 including the auxiliary terminal connection electrodes 5a and 5b and the area resistance of the signal transmission line electrode 19 becomes as large as possible. For example, it is configured in a thin line shape.

With this configuration, the auxiliary terminal electrode 4 is more likely to cause electrostatic breakdown than the signal transmission line electrode 19, and any static electricity applied to the liquid crystal display panel 17 in any form causes the auxiliary terminal electrode 4 to Electrostatic breakdown occurs preferentially and does not affect other electrode parts. Further, since this destruction is performed in the sealing material 12, the display on the liquid crystal display panel 17 is not affected. Further, since the auxiliary terminal connection electrodes 5a and 5b are branched into two from the auxiliary terminal electrode 4 and connected to the signal transmission line electrode 19, even if one branch is electrostatically damaged, the other branch remains. As a result, continuous static electricity can be removed. Furthermore, the auxiliary terminal connection electrodes 5a, 5b
The auxiliary terminal electrodes 4a and 5b are formed so that the area resistance of the auxiliary terminal electrode 4 is larger than the area resistance of the signal transmission line electrode 19 and the area resistance ratio between them is as large as possible. In this portion, electrostatic breakdown occurs more reliably and does not affect other electrode portions.

Next, a liquid crystal display panel provided with the auxiliary terminal electrode 4 shown in the above-described embodiment, and the auxiliary terminal electrode 4
The result of conducting a static electricity application test on a conventional liquid crystal display panel not provided with the above will be described.

The contents of the test are as follows: a conventional liquid crystal display panel shown in FIG. 2 was used, and a conventional liquid crystal display panel having no auxiliary terminal electrode 4 and an auxiliary terminal electrode 4 having a signal transmission line electrode In contrast to the structure shown in the present embodiment in which the connection resistance with the liquid crystal 19 is increased, a charge in the range of 1 kV to 20 kV is applied from the first glass substrate 13 and the second glass substrate 14 respectively to each liquid crystal. As a result of actually driving the display panel and counting the number of display defects that occurred,
As shown in (Table 1), the device shown in the present embodiment did not have display defects, whereas the device of the related art applied three charges.
As a result, the number of display defect occurrences increased in proportion to the rise from kV to 20 kV.

[0013]

[Table 1]

(Note) With auxiliary electrode: Area resistance ratio
Test on 2.0 liquid crystal display panel (Area resistance ratio = auxiliary terminal connection electrode / signal transmission line electrode) In parallel with the above test, signal transmission line electrode 19 and auxiliary terminal connection electrode 5a, The liquid crystal display panel 17 was prepared and tested in the same manner as described above by changing the sheet resistance in order to investigate the number of display defects caused by the difference in the sheet resistance ratio with the auxiliary terminal electrode 4 including 5b. (Table 2)
As shown in the figure, the number of display failures decreased in inverse proportion to the increase in the ratio of the sheet resistance.

[0015]

[Table 2]

As is apparent from these tests, when the auxiliary terminal electrodes are arranged, and the area resistance ratio is larger when the area resistance of the auxiliary terminal electrodes including the auxiliary terminal connection electrodes is larger than that of the signal transmission line electrode. It can be seen that there is little display failure, electrostatic breakdown surely occurs at the auxiliary terminal connection electrode portion, static electricity is removed, and the other electrode portions are not affected.

[0017]

As described above, according to the present invention, each electrode portion of a liquid crystal display panel can be protected from static electricity generated during a liquid crystal display device manufacturing process, product assembly, use, and the like, and the yield can be greatly increased. An advantageous effect of improving the performance is obtained.

[Brief description of the drawings]

FIG. 1 is an external plan view showing a configuration of a liquid crystal display panel according to an embodiment of the present invention, and a partially enlarged plan view thereof.

FIG. 2 is a cross-sectional view of a general liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pixel electrode, 2 ... Signal input terminal electrode, 3 ... Conductor electrode part, 4 ... Auxiliary terminal electrode, 5 ... Auxiliary terminal connection electrode
6: polarizing plate, 7: protective sheet, 8: transparent electrode,
9: alignment film, 10: spacer, 11: liquid crystal, 12: sealing material, 13: first glass substrate (upper glass), 14 ...
Second glass substrate (lower glass), 15… Connector, 16…
Printed circuit board, 17: LCD panel, 18: LSI for driving liquid crystal, 19: Line electrode for signal transmission, 20: Drive circuit unit.

Claims (4)

[Claims] An auxiliary terminal electrode other than for signal transmission is formed in a conductive wire electrode portion connecting a signal input terminal provided on a pair of transparent substrates in a liquid crystal display panel to a pixel electrode in the transparent substrate. LCD panel. 2. The method according to claim 1, wherein the auxiliary terminal electrode is branched into one or more portions and connected to the conductive wire electrode portion.
Liquid crystal display panel as described. 3. The liquid crystal display panel according to claim 2, wherein the auxiliary terminal electrode and the conductive wire electrode portion are connected inside a liquid crystal sealing material. 4. The liquid crystal display panel according to claim 1, wherein the area resistance of the auxiliary terminal electrode is larger than the area resistance of the conductor electrode portion.