JPS6266231A - liquid crystal display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display element, and particularly to an electrode structure of a liquid crystal display element using a non-linear element.

[Summary of the invention]

In the electrode structure of a liquid crystal display element using a non-linear element, the present invention sets a high resistance between the signal application terminal of the electrode for applying a signal and the display part, thereby preventing the occurrence of static electricity applied from outside during manufacturing. [Prior art] Conventionally, in liquid crystal display elements using non-m type elements, S
From 84 D Engineering G]nST 304-387.
Pages 524-325, Engineering 11! EX Trano
II! 1 ectron Dev, I! tD
-50°552 (1983), etc., but there is no particular mention of the structure of the signal electrode itself, and it was thought that the resistance of the signal electrode should be as low as not to cause uneven display.

[Problems and objects to be solved by the invention] Conventionally, liquid crystal display devices using non-linear elements have been subject to abnormalities in the non-linear elements (
Pixel defects caused by defects (defects) have been a major cause of lower yields and, ultimately, higher costs. The causes of this nonlinear element abnormality include defects in the shape of the element pattern that occur during the process, as well as nonlinear elements caused by static electricity applied to the electrodes during manufacturing, especially when connecting to a part of an external driver. There were cases where the characteristics of the device became abnormal. Therefore, the present invention is intended to solve these problems, and its purpose is to provide an inexpensive liquid crystal display element using a non-linear element [Means for solving the problems] The present invention The liquid crystal display element is characterized in that the electrical resistance of the electrode to which a signal is applied is higher between the input terminal and the input part to the pixel than in other parts [Function] The above structure of the present invention According to , the resistance part of the electrode that applies a signal and the stray capacitance ii (the capacitance of the pixel part and the capacitance formed between the counter electrode) of the electrode of the pixel from that part form a so-called 08 circuit, and there is a steep slope. When pulsed static electricity is applied to the terminal of the electrode, the voltage applied to the nonlinear element of the pixel is lowered to prevent destruction of the nonlinear element.

〔Example〕

As an embodiment of the present invention, the nonlinear element is made of metal (Meta).
l) - Insulator - Metal (Meta)
Explanation will be made based on a liquid crystal display element using a so-called M element having a three-layer structure (x). In this embodiment, an M element made of tantalum-tantalum oxide-chromium is used as the M element.

FIG. 1 shows one embodiment of the liquid crystal display element of the present invention. This is a schematic diagram of the electrode structure on a transparent substrate. 1 is a tantalum film that serves as a signal application terminal, 2 is a resistor created between the input terminal and the pixel (made of tantalum that has been oxidized with mental oxide), and 3
4 is a transparent electrode forming a pixel.

FIG. 2 is a schematic diagram of an electrode structure in a conventional example.

Figure 3 is an enlarged view of the M element 3 in Figures 1 and 2. 5 is a mental electrode covered with tantalum oxide, 6 is a chromium electrode pattern, In a schematic diagram of a cross section cut by a single-dot chain ls7, 8 is a transparent substrate, 9 is tantalum, 10 is tantalum oxide, and 9.10 forms the electrode shown in FIG. 3-5.

Figure 5 is an equivalent circuit diagram of the embodiment shown in Figure 1, where 11 is the input terminal, 12 is the resistance created between the pixel and the input terminal, 15 is the stray capacitance of the electrode, and 14 is the resistance of the M element. It changes depending on the voltage at both ends. 15 is the capacitance of the M element, 16 is the liquid crystal resistor, 17 is the liquid crystal capacitor, and 18 is the electrode of the opposing substrate. FIG. 6 is a schematic diagram of an electrode structure in another embodiment of the present invention.

In an experiment using a liquid crystal display element using M technology and an M element, which is an embodiment of the present invention, in the case of electrodes with the conventional structure shown in Fig. 2, the probability of mounting a liquid crystal panel was almost 100%. Although the number of pixel defects increased, no increase was observed by changing the electrode structure to that shown in FIG. At this time, the resistance from the terminal to the first pixel had changed from 200Ω to 35Ω.

Also, 100P? When the charge stored in the capacitor was discharged to the terminal and the increase in pixel defects was observed, by changing to the electrode structure of the example, the pixel defects did not increase by about 1.5 times with the capacitor charging voltage.

However, if the resistance between the input terminal and the pixel is further increased, it becomes difficult to write data to the pixel. Furthermore, if the resistance of the entire electrode is increased by reducing the film thickness of the electrode, etc., the unevenness of the display becomes noticeable. Based on these facts, the resistance value ranges from 1KΩ to 10Ω as described in claim 2.
The level was appropriate. In addition, as stated in claim 3, when an element having an insulating layer such as an M-type element is used as a non-linear element, the insulating layer may be destroyed by static electricity, as in the embodiment of the present invention. The effect is great because it can be alleviated by taking a configuration.

〔effect〕

As described above, according to the present invention, in a liquid crystal display element using a non-linear element, by making the resistance between the input terminal of the electrode and the pixel higher than other parts, static electricity that enters from the terminal during manufacturing can be reduced. It is possible to prevent nonlinear elements from being destroyed. This can be done by simply changing the pattern shape of the electrodes, so it is possible to increase the yield at no cost and has the effect of providing an inexpensive liquid crystal display element.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of electrode shapes showing one embodiment of the liquid crystal display element of the present invention. FIG. 2 is a schematic diagram of the electrode shape in a conventional example. FIG. 3 is a schematic pattern diagram of the M element used in the example. FIG. 4 is a schematic cross-sectional view of the M element shown in FIG. 3. FIG. 5 is an equivalent circuit diagram of the electrode in the example. FIG. 6 is a schematic diagram of an electrode shape in another embodiment. that's all

Claims (3)

[Claims] (1) a) A liquid crystal is sealed between two transparent substrates, and b) A signal electrode for applying a signal is provided inside at least one of the transparent substrates, and a two-terminal nonlinear element is connected to the signal electrode. c) In a liquid crystal display element in which pixels are formed in a matrix between transparent electrodes on opposing substrates, a large number of transparent electrodes are formed and connected through: d) electrical resistance of the electrode to which a signal is applied. between the input terminal and the input part of the pixel is higher than other parts of the electrode. (2) The resistance between the input terminal and the input part to the pixel is 1KΩ
The liquid crystal display element according to claim 1, wherein the resistance is 10KΩ or less. (3) The liquid crystal display element according to claim 1, wherein the non-linear element has an insulating layer.