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Color liquid crystal display device and its display method

A liquid crystal display device and color display technology, applied in identification devices, static indicators, optics, etc., can solve the problems of light color, no display, ugly and clear, etc., and achieve the effect of low cost

Inactive Publication Date: 2008-09-10
STANLEY ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, it is theoretically infeasible to use a liquid crystal display element with a slow response speed for field sequential driving. In the case of forced field sequential driving of such a slow liquid crystal display element at the above-mentioned 50Hz frame frequency, no display will be performed at all. , or even when displayed, the color is very faint and difficult to see
If the frame frequency is lowered according to the response speed of the liquid crystal display element, it is possible to confirm what kind of display is displayed or to deepen the color, but in this case, the color change itself is regarded as flickering, and it is still difficult to see clearly.

Method used

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  • Color liquid crystal display device and its display method
  • Color liquid crystal display device and its display method
  • Color liquid crystal display device and its display method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] To apply the present invention to figure 2 The illustrated embodiment of the liquid crystal display element in which the segment display and the dot matrix display are mixed is explained.

[0035] As an ordinary segment type + dot matrix liquid crystal display element, a 90-degree twisted TN-LCD in a normally black mode is used. The basic structure is the same as that of ordinary TN-LCD, but in order to emphasize the blackness of the substrate and reduce the transmittance, the product of the birefringence of the liquid crystal and the cell thickness, that is, the retardation value is set to 2.5 microns. The birefringence of the liquid crystal is 0.2, and the cell thickness is 12.5 microns. The liquid crystal display element is driven in a multi-channel driving mode with a duty ratio of 1 / 8. The response speed at this time is very slow due to the thick cell thickness, and the total rise and fall time is about 250ms.

[0036] On the other hand, as a field sequential l...

Embodiment 2

[0041] To apply the present invention to image 3 An example of a full dot matrix type liquid crystal display element is shown for illustration.

[0042] As an ordinary full-dot-matrix liquid crystal display element, a film-compensated 240-degree twisted STN-LCD in normally black mode is used. The basic structure is exactly the same as that of ordinary STN-LCD. The retardation value, which is the product of the birefringence of the liquid crystal and the cell thickness, was set to 0.9 μm. The liquid crystal display element is driven by a multi-channel driving mode with a duty ratio of 1 / 240. The response speed at this time is about 200ms in total for the rise and fall times.

[0043] On the other hand, as a field sequential liquid crystal display, a liquid crystal cell having exactly the same cell conditions as in Example 1 was used. The difference from Example 1 is only the difference in the shape of the pattern when divided into blocks. Here, a display element of 480 x ...

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Abstract

The invention provides a color liquid crystal display element having the characteristic of field sequential driving and capable of multi-color display by one segment (dot) at a low cost even in the liquid crystal display element having a large display capacity needing high duty driving. A liquid crystal display is formed by combining the liquid crystal display element 1 of a usual segment+dot matrix type capable of monochrome display (white and black display) with a field sequential driving liquid crystal display element 2 capable of color display. The field sequential driving liquid crystal display element 2 has a plurality of display regions each corresponding to one segment or dot region of the liquid crystal display element 1 capable of monochrome display, or a region in which two or more segment or dot regions thereof are collected.

Description

technical field [0001] The invention relates to a color liquid crystal display device and a display method thereof using field sequentially driven liquid crystal display elements. Background technique [0002] Patent Document 1: JP-A-2002-221700 [0003] As a method of coloring a liquid crystal display element, there is a method of using a color filter, but in this case, there are problems such as high cost. Also, in this method, there is a problem that one display area can only display the color corresponding to the color filter color of the portion. [0004] In order to solve these problems, a field sequential liquid crystal display element has been proposed. This method has a plurality of light sources that emit light of different colors, repeats the action of making these light sources sequentially emit light, and performs on and off of the liquid crystal display element according to the timing of the light emission of the light source, thereby using the human eye to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36G09F9/35G02F1/1347G09F9/46
CPCG02F1/1335G02F1/133514G02F1/1336
Inventor 杉山贵岩本宜久
Owner STANLEY ELECTRIC CO LTD