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Refection type liquid crystal display device

A liquid crystal display device, reflective technology, applied in static indicators, instruments, optics, etc., can solve problems such as brightness reduction

Inactive Publication Date: 2003-01-15
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, the auxiliary light source is only enough to supplement the lack of ambient light, and does not emit strong light like the backlight of the transmissive liquid crystal display device does.
Accordingly, if a color filter with high color purity (for example, a color filter for a transmissive liquid crystal display device) is used in a reflective liquid crystal display device with an auxiliary light source, the luminance is significantly reduced

Method used

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  • Refection type liquid crystal display device
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  • Refection type liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058] Figure 6 It is a cross-sectional view of a reflective liquid crystal display device 30 according to Example 1 of the present invention. The TFT 40 is formed on the substrate 31 by a known technique. Concave and convex organic insulating films 42a and 42b are also formed on the substrate 31, and the reflective electrode 38 is thus formed so as to be electrically connected to the respective TFT 40 through the contact hole 43. An alignment film 44 is formed on the obtained substrate 31.

[0059] The color filter 46 is formed on the facing substrate 45. The color filter 46 includes red, green, and blue color filters 46a and a black color filter 46b, wherein the color filter 46a is located at a position corresponding to the reflective electrode 38 on the substrate 31, and the color filter 46b is not corresponding to the reflection The remaining position of the electrode 38. A protective film (not shown in the figure) is formed on the entire surface of the color filter 46. It i...

example 2

[0074] The reflective liquid crystal display device of Example 2 has substantially the same structure as the reflective liquid crystal display device described in Example 1. In this example, the red color filter used in Example 1 is used, and the spectral characteristics of the green and blue color filters are set so that the white color obtained by the additional color mixing of the three colors is in the XYZ color system The chromaticity coordinates (x, y) are in Figure 5 In the range shown by the diagonal line in, that is, the expressions 0.28≤x≤0.31 and 0.29≤y≤0.33 are satisfied. In addition, if the y value of the three stimulated values ​​in the XYZ color system is in the range of 50 to 70 (including 50 and 70), sufficient brightness can be obtained.

[0075] We know that since the color filter used in the liquid crystal display device includes a layer formed of a transparent conductive film, a protective film, etc., made of materials such as ITO, the white color is particul...

example 3

[0081] Generally, the color reproduction range of a liquid crystal display device is determined by the color purity of the color filter. When the color purity is higher, the color reproduction range becomes larger. However, when the color purity is high, the light transmittance of the color filter becomes low, and bright display cannot be realized. Therefore, in this example, when designing the color of the red, green, and blue color filters 46a, priority is given to the display brightness. The structure of the reflective liquid crystal display device of this example is substantially the same as the structure of the reflective liquid crystal display device of Example 1.

[0082] When increasing the transmittance while maintaining a certain chromaticity to a certain extent, when displaying colors such as green, yellow, and blue-green that include many wavelength ranges with luminous effects, they exhibit extremely poor contrast to white. It is the most difficult to recognize. For t...

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Abstract

The reflection type liquid crystal display device of this invention includes a pair of substrates opposing each other with a liquid crystal layer therebetween, a reflection electrode being formed on one of the substrates, a light-transmissive counter electrode and color filters of three colors of red, green, and blue being formed on the other substrate, wherein the red color filter transmits light of which chromaticity coordinates (x, y) in an XYZ color system chromaticity diagram satisfy expressions 0.37<=x<=0.43 and 0.28<=y<=0.32 under a condition of a 2 DEG field of view using a D65 light source.

Description

Technical field [0001] The invention relates to a small-size and low-power reflective liquid crystal display device. The present invention particularly relates to a reflective liquid crystal display device capable of providing a colorful display and a reflective liquid crystal display device equipped with an auxiliary lighting system. Background technique [0002] Conventionally, liquid crystal display devices have been used as displays for information terminals. Such liquid crystal display devices are divided into two types: transmissive liquid crystal display devices that can provide a bright display by using backlight as a light source; and reflect the display by reflecting surrounding light without using backlight as a light source. -Type liquid crystal display device. [0003] Although a bright display is achieved, the transmissive liquid crystal display device including the backlight is heavy and consumes a lot of power. In contrast, a reflective liquid crystal display devi...

Claims

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Application Information

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IPC IPC(8): G02B5/20G02F1/1335G02F1/13357
CPCG02F2001/133616G02F1/133553G02F1/133514G02B5/201G02F1/133616
Inventor 中村浩三
Owner SHARP KK
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