JPS62205320A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To eliminate a difference in retardation and a difference in reflection due to the thickness of an electrode and to obtain high quantity even in birefringent mode by providing an electrode group which takes part in illumination display and an electrode group which does not take part on the electrode surface of a substrate. CONSTITUTION:This device is equipped with display electrodes 2, lead-around electrodes 3 for connection with external terminals, terminal electrodes 4 for external connection, and additional electrodes 5 and 6. The electrodes 5 face one of the group of the lead-around electrodes 8 for external connection and to not take part in the display. On the other hand, electrodes 11 and 12 are provided by being formed on the substrate 7 as well as a signal electrode substrate 1. The liquid crystal layer composed of the substrates 1 and 7 is uniform in thickness in the majority of the area and a difference in color tone due to a difference in the thickness among electrodes is eliminated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electrode structure of a liquid crystal display device.

[Conventional technology]

Most of the structures of liquid crystal display devices are as shown in Figure 4.
It has a nocturnal layer 21 and a substrate 23 having an electrode 22 on the inner surface holding the night crystal layer 21. FIG. 6 shows the configuration of an electrode pattern of a typical liquid crystal display device. In FIG. 5, the electrodes on the inner surface of the upper substrate 24 are signal electrodes, and the display electrodes 25,
It is taken out from the winding electrode 26 and the terminal electrode 27. The electrodes on the inner surface of the lower substrate 28 are scanning electrodes, and the configuration of the electrodes is the same as that of the signal electrodes.

[Problem that the invention seeks to solve]

In conventional liquid crystal display devices, as shown in FIGS. 5 and 4, the difference between the thickness of the liquid crystal layer corresponding to the electrodes and other parts is approximately α111m to 0.2 μm. A difference in the thickness of the liquid crystal layer, especially in a liquid crystal display device that makes full use of the birefringence effect, appears as a difference in turretition, and significantly deteriorates the appearance of the display device. Further, due to the reflection of the electrodes, there is a difference in the reflected light of the display image between the electrode portion and the non-electrode surface, resulting in a 5-dimensional appearance. To make up for all the above-mentioned drawbacks of the present invention (this invention was devised and aimed at eliminating the difference in retardation due to the thickness of the electrodes and the difference in reflection) [To solve the problems] [Means] The liquid crystal display device of the present invention has, on the electrode surface of the substrate, an electrode group that is involved in lighting display and an electrode group that is not involved in the lighting front thread. A display signal sound is introduced by connecting to the external terminal of the electrode group.
It is characterized by an electrode assembly that faces one or more of the electrodes and is electrically connected to the outside or other electrodes, and is provided on the inner surface of the opposing substrate.

[Effect]

According to the upper gb structure of the present invention, this was not previously necessary. By creating electrodes in areas that are not involved in lighting display, a uniform cell gap and electrode reflection can be obtained, and display quality will not be improved. The part will not affect the display or the new electrode part will light up.

[Actual gun example]

This will be explained below using an actual case.

- Actual Example 1 FIGS. 1(a) and 1(b) show the electrode structure of a liquid crystal display device according to the present invention. FIG. 1(a) is a plan view of a signal electrode substrate, and FIG. 1(1) is a plan view of a scanning electrode substrate. It carries a display electrode 2, a lead-out electrode filter for connecting to an external terminal, an external connection terminal [m4], and an electrode 5.6 according to the present invention. The electrode 5 faces one of the eight groups of ground electrodes electrically connected to the outside on the scanning T& substrate 7. Therefore, when the liquid crystal display device i is configured, the electrode 5 portion is completely (There is no involvement in the display. The electrode 6 is not opposed to the electrodes 8, 9 and 10 on the substrate 7 which are electrically connected to the outside, and is not involved in the display at all. The electrodes on the scanning electrode substrate 7 are also similar to the signal electrode substrate, and the electrodes 11 and 12' (z) are provided as the electrodes of the present invention. The liquid crystal layer has a uniform thickness in most areas, and there is no difference in color tone due to differences in electrode thickness.Also, the reflection on the display surface is uniform over the entire surface, and the appearance is very good. fc.

implementation? IJ 2 FIGS. 2(a), Cb) show another embodiment of the invention.

Here, (a) in the same figure shows a substrate for signal electrodes, and (1) in the same figure shows a substrate for scanning electrodes.

That is, here, the routing electrodes 3EL and 8 for connection to external terminals in Example 1 were expanded to meet the conditions of the present invention to form routing electrodes 16°14. The area of the same thickness of the liquid crystal layer was wider than that of the actual example 1, and uniform color tone and reflection could be obtained, resulting in better display quality than the actual example 1.

〔Effect of the invention〕

With an excellent appearance, the liquid crystal display device incorporating the liquid crystal display element according to the invention gave very good display quality.

Furthermore, the electrodes shown in the actual example require only a slight increase in process load, and a high-quality liquid crystal display element can be obtained. The present invention is particularly effective for birefringence mode liquid crystal display devices that require uniformity of the liquid crystal layer, and is useful as a structure for improving display appearance.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are plan views according to embodiments of the present invention,
82 (a) and (b) are plan views showing other embodiments,
FIGS. 3 and 4 are plan views showing the structure of a conventional electrode. 1...Signal electrode substrate 2...Display electrodes 3.8, 15.14...Rolling electrodes 4.10...
- External terminal electrodes 5.6, 11.12... Electrode 7 according to the present invention... Scanning electrode substrate J strain-: J island φ- 21... Liquid crystal layer 22... Electrode 23... Substrate 24...Upper board 25...Lower board 26...Rolling electrode 27...One terminal electrode 28...Display electrode closed output return Seiko Epson Corporation I + Niji 12. 4p Heaven 1L: * Upper Yoto) Day 7 = (α) Cb) Figure 1 (α) (G) Figure 4

Claims (1)

[Claims] In a liquid crystal display device having at least two opposing substrates that sandwich a liquid crystal layer and have one or many electrodes on their inner surfaces, an external terminal of one or many electrically insulated electrodes is provided. A liquid crystal display device, characterized in that a display-independent electrode, which faces one or less of the electrodes connected to introduce a display signal and is not electrically connected to the outside or other electrodes, is provided on the inner surface of the opposing substrate. .