JPS6043686A - Color liquid crystal image display unit - 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] (Industrial application field) The present invention relates to a color liquid crystal image display device.

(Conventional structure and its problems) Liquid crystal display devices take advantage of their characteristics of low power consumption and thinness, and are used in a wide range of fields. Shown in Figure 1. A switching transistor 3 such as an amorphous silicon thin film transistor (hereinafter referred to as a-8iTFT) is arranged at the intersection of the signal line 1 and the dirt line 2,
The image signal from the signal line 1 is transmitted through the a-8i TFT 3 to the electrode 4 corresponding to each picture element.

FIG. 2 shows a schematic cross-sectional view of a panel of an image display device such as a color television using liquid crystal. A liquid crystal 9 is sandwiched between a common transparent electrode 6 formed on the surface of a glass substrate 50 and a large number of transparent electrodes 8 corresponding to picture elements on the other glass substrate 7. In a color liquid crystal image display device, for example, red (
R), rim (G).

A blue (B) mosaic-like color filter 10 is provided on the transparent electrode 8, and light such as natural light or white light is projected from the back side of the glass substrate 7 onto the glass panel.
I'm starting to watch 4 channels. However, a color liquid crystal display device in which a mosaic filter is superimposed on a matrix circuit of the liquid crystal image display device shown in FIG. 1 has a drawback of poor color reproducibility. That is, more R and G as shown in FIG.

In the configuration of the three-color filter B, for example, on the 1-1 signal line, the -th row receives a red signal, the next row receives a green signal on the same signal line, and then the same signal on the next row, and so on. Each color signal is sequentially transmitted to each transparent electrode 4 using a line. However, since the switching speed of the a-3i TFT 3 is slow, the color signal cannot be completely sent to the transparent electrode 4 before the color signal of the next row arrives. As a result, color signals are mixed between the front and rear lines, resulting in poor color reproducibility.

(Object of the Invention) In view of the above-mentioned drawbacks, the present invention provides a color liquid crystal image display device that transmits each color signal through a dedicated signal line to prevent color signals from being mixed on the signal line, and has good color reproducibility. It is something.

(Structure of the Invention) In order to achieve this object, in the color liquid crystal image display device of the present invention, each of the plurality of signal lines is provided with a filter element of one type of color filter through a switching transistor. The structure is such that it connects to multiple electrodes.

(Description of an embodiment) Next, an embodiment of the present invention will be described. The method of the Cassie filter of a color liquid crystal image display device will be explained using a representative picture table and a three-color filter of red (R), green (G), and blue (B) as an example. As shown in Fig. 3, if transparent electrodes 4 equipped with color filters, signal lines 1, gate lines 2, and switching transistors 3 are arranged, color signals corresponding to the colors of each color filter can be dedicated. It can be used as a signal line.

For example, the signal line 1-1 is a signal line dedicated to red (R), and the signal line 1-2 is a signal line dedicated to green (G). According to the matrix circuit and color filter configuration shown in Fig. 3, even if the switching speed of the a-3i TFT 3 is slow and some signal mixing occurs between the front and rear rows, the signal lines can be used for each color. Since it is a dedicated signal line, color mixing does not occur.

Therefore, color reproducibility does not deteriorate.

As another embodiment of the present invention, a case where the present invention is applied to a four-color color filter system will be described. As shown in the matrix circuit diagram and filter configuration diagram in FIG. 4, transparent electrodes 4-1, 4-2, 4-3 are equipped with four types of color filters.
, 4-4, Switching Trannock 3. Dirt line 2. Signal line 1-1 corresponding to the color of each color filter. ．． 1-
2.1-3.Wire 1-4. By using such a matrix/box structure, the color reproducibility of the color liquid crystal image display device can be improved in the same way as the three-color filter shown in FIG.

(Effects of the Invention) As described above, in the present invention, each of the plurality of signal lines
Through the switching transistor, on the connected electrode, a filter element of one kind of color of the color filter is provided, which can prevent the mixing of color signals in the signal line, thus improving the color reproduction. You can increase your sexuality.

Further, since the signal lines are dedicated to each color, the peripheral circuitry for driving the matrix becomes simple.

[Brief explanation of the drawing]

FIG. 1 is a matrix circuit diagram and filter configuration diagram of a conventional color liquid crystal display device, FIG. 2 is a schematic cross-sectional view of a color liquid crystal display device, and FIG. 3 is a three-color display according to an embodiment of the present invention. Matrix circuit diagram and filter configuration diagram of filter type color liquid crystal display device FIG. 4 is a matrix circuit diagram and filter configuration diagram of a four color filter type color liquid crystal display device according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Signal line, 2... Gate line, 3... Switching transistor, 5, 7 Glass substrate, 6... Common transparent electrode, 8... Transparent electrode, 10 - Color filter. Patent applicant: Matsushita Electric Industrial Co., Ltd. Agent Hisashi Hoshino Figure 1 Figure 2

Claims (1)

[Claims] A first flat plate provided with a common transparent electrode, a plurality of signal lines in the vertical direction, a plurality of gate lines in the horizontal direction, and connected to the signal line and the gate line via switching transistors. a second flat plate provided with a plurality of electrodes; a liquid crystal sandwiched between the electrodes of the first flat plate and the second flat plate; and a color film disposed on the plurality of electrodes. A color liquid crystal image display device comprising: the color filters on the plurality of electrodes connected to each of the signal lines have the same color.