JPS63210914A - Color liquid crystal display panel - Google Patents

Abstract

PURPOSE:To make an adjustment to the best color balance by wiring respective lead electrodes corresponding to the three primary colors R, G, and B in plural layers and concentrating them on different positions, and connecting driving ICs by the colors. CONSTITUTION:Many display electrodes 12 corresponding to the R, G, and B are arrayed on the surface of an electrode substrate 11, one-terminal sides of the respective lead electrodes 13 are connected to the respective display electrodes 12, and the driving ICs 14 which are concentrated on the same positions by the colors are connected to the other-terminal sides by the colors. When the lead electrodes 13 are concentrated by the colors, the three- dimensional crossing of the electrodes is inevitable, so the lead electrodes 13 need to be wired in plural layers. For the purpose of the multilayered wiring, insulating layers 15 are only interposed among the lead electrodes 13 by the colors.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a color liquid crystal display panel in which a driving IC is directly bonded to an electrode substrate, and relates to the structure of an electrode substrate for the purpose of improving color balance. It is.

[Conventional technology]

Color liquid crystal display panels used in color liquid crystal televisions and the like have various structures, one of which has three color filters of R, G, and B and display electrodes for driving the liquid crystal. There are some that change the light transmittance by overlapping and driving the liquid crystal.

Among such color liquid crystal display panels, one in which a switching element is provided for each display electrode is called an active panel. On the other hand, a panel in which a matrix is formed by a large number of display electrode groups and is time-divisionally driven by a common drive circuit is called a passive panel.

There are two ways to connect a passive LCD panel to the drive circuit. One is to connect the LCD panel and the drive circuit using a flexible sheet, but the number of connection terminals is extremely large. It has the disadvantage of being unreliable.

On the other hand, a type in which a driving IC chip is directly connected to an electrode substrate of a liquid crystal panel is known as a chip-on-panel type.

In this case, since it is only necessary to connect the power supply and control circuit to the IC chip on the panel, the number of connection terminals is extremely reduced and reliability is improved.

This will be explained below with reference to the drawings.

FIG. 2 is a plan view showing the structure of a conventional electrode substrate in a chip-on-panel type display panel.

A large number of display electrodes 22 corresponding to three colors of R, G, and H are arranged on the surface of the electrode substrate 210. Although nine display electrodes 22 are schematically shown in FIG. 2, several hundred display electrodes are arranged in an actual display panel. Each display electrode 22 is connected to one end of a lead electrode 26, and the other end of the lead electrode 26 is concentrated in one place and connected to the driving IC 24.

In this way, in conventional display panels, R, G, B
Since the display electrodes corresponding to the three colors are driven by a common drive IC, it is not possible to individually adjust the driving conditions for the display electrodes of the three colors.

By the way, the display electrodes of R%G and B are R, G and H, respectively.
However, when a display panel is driven under certain driving conditions using these filters, it is often not possible to obtain a predetermined color balance.

Particularly in panels where a part of the driving voltage is applied to the filter, the effective voltage applied to the liquid crystal depends on the filter capacity, so the thickness non-uniformity of each color filter produced by different manufacturing processes may occur. This is a major factor that disrupts color balance.

In addition, depending on the spectrum of the illumination light source that makes up the liquid crystal display panel, the light transmission characteristics of the polarizing plate and the liquid crystal layer, etc.
The light that passes through the display panel is often colored rather than white light. This is also a cause of disrupting the color balance.

In such a case, it is necessary to individually adjust the driving conditions for each display of R, G, and H to optimize the color balance.

[Object and structure of the invention]

Therefore, an object of the present invention is to make it possible to adjust the color balance in a chip-on-panel type color liquid crystal display panel.
The lead electrodes connected to the respective display electrodes corresponding to the three colors are wired in multiple layers, concentrated at different positions, and connected to the respective driving ICs for each color.

Embodiments will be described below with reference to the drawings.

〔Example〕

FIG. 1 is a plan view showing the structure of an electrode substrate in an embodiment of the present invention.

A large number of display electrodes 12 corresponding to the three colors R, G, and B are arranged on the surface of the electrode substrate 110, and one end of each lead electrode 16 is connected to each display electrode 12. The ends are concentrated in one place for each color and connected to the driving ICI 4 for each color.

In order to concentrate the lead electrodes 16 for each color, it is necessary to wire the lead electrodes 16 in multiple layers because three-dimensional crossing of the electrodes is unavoidable. For multilayer wiring, an insulating layer 15 may be interposed between lead electrodes 16 of each color.

〔Effect of the invention〕

As shown in the examples, in the display panel of the present invention,
Since the display electrodes are individually driven for each color by a dedicated driving IC, it is possible to set driving conditions such as driving voltage for each color, and it is possible to adjust the optimum color balance.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an electrode substrate according to an embodiment of the present invention, and FIG. 2 is a plan view of a conventional electrode substrate. 11... Electrode substrate. 12...Display electrode, 16...Lead electrode, 14...Drive IC5 15...Insulating layer.

Claims (1)

[Claims] R on the surface of the electrode substrate constituting the color liquid crystal display panel.
In a display panel that drives a liquid crystal by arranging a large number of display electrodes that display three colors, G and B, and connecting them with a drive IC that is directly bonded to the surface of an electrode substrate using lead electrodes, R
A color liquid crystal display panel characterized in that lead electrodes corresponding to three colors, , G, and B, are wired in multiple layers, concentrated at different positions, and connected to respective driving ICs for each color.