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Base board for liquid crystal display element

A technology of liquid crystal display elements and substrates, applied in the direction of diffusion elements, optics, instruments, etc., can solve the problems of low light utilization coefficient, drive signal speed reduction, signal delay, etc., to improve utilization coefficient, eliminate signal delay, and eliminate possible sexual effect

Inactive Publication Date: 2006-02-08
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Light is absorbed to make the utilization factor of light lower
[0005] Also, when the liquid crystal is driven, capacitance occurs between the metallized film and the transparent electrode (transparent conductive film), causing a signal delay, and thus the speed of the driving signal for driving the liquid crystal display element may decrease

Method used

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  • Base board for liquid crystal display element
  • Base board for liquid crystal display element
  • Base board for liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0126] First, from soda-lime glass material (substantially composed of 72% by weight of SiO 2 , 13% Na 2 O, 8% CaO, 1.8% Al 2 o 3 and 0.9% K 2 O composition) The above-mentioned transparent substrate 1 for the back side was prepared. Then, on one surface of the prepared transparent substrate 1, several pairs of high-refractive-index transparent films 7 and low-refractive-index transparent films 8 are stacked according to the stacking number indicated in Table 1 and have the thickness indicated in Table 1, and then Matching oil 13 having a refractive index of 1.55 and transparent substrate 1a were laminated to prepare test pieces as Example Nos. 1-17. As materials for the high-refractive-index transparent film 7 and the low-refractive-index transparent film 8, titanium dioxide (TiO 2 ) and silicon dioxide (SiO 2 ) (the same applies to the following examples). Also, the thickness of each of the transparent films 7 and 8 is determined according to the number of stacks so t...

example 2

[0131] Next, on one surface of the transparent substrate 1, pairs of the high-refractive-index transparent film 7 and the low-refractive-index transparent film 8 are stacked by the stacking number indicated in Table 2 with the thickness indicated therein, and then stacked with a thickness of 1.55 The refractive index matching oil 13 and the transparent substrate 1a, thereby preparing test pieces as Example No.18-39. These test pieces were measured in the same manner as in Example 1, and the results are shown in Table 2. Also, the thickness of each of the transparent films 7 and 8 is set in accordance with the number of stacks so that the light reflectance in the visible light region is within a range of not less than 25% but less than 45%.

[0132] It is understood from Table 2 that by setting the stacking logarithm and film thickness of each of the high-refractive-index transparent film 7 and the low-refractive-index transparent film 8 to the values ​​indicated in Table 2, wh...

example 3

[0134] Tables 3 and 4 show the results obtained by measuring in the same manner as in Example 1 when the light reflectance in the visible region was in the range of not less than 45% but less than 65%.

[0135] It is understood from Tables 3 and 4 that by setting the stack logarithm and film thickness of each of the high-refractive-index transparent film 7 and the low-refractive-index transparent film 8 to the values ​​indicated in Tables 3 and 4, when the light reflectance in the visible region is at In the range of not less than 45% but less than 65%, the difference between the maximum value and the minimum value of the light reflectance of No.40-78 wavelength components red (R), green (G) and blue (B) can be is kept at approximately 10% or less.

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Abstract

A substrate for liquid crystal display elements is provided, which can meet a variety of required optical characteristics and, at the same time, improve the utilization factor of light without the possibility of inducing a signal delay. A predetermined number of pairs of a transparent film having a high refractive index and a transparent film having a low refractive index, each composed of a dielectric material, are stacked on a transparent substrate. The high refractive index transparent film and the low refractive index transparent film have refractive indices of light of not less than 1.8 and not more than 1.5 at a wavelength of 550 nm, respectively. The predetermined number of pairs is 1 or more, and the high refractive index transparent film and the low refractive index transparent film each have a film thickness thereof set to such a value that the light reflectance in a visible light region of each of the transparent films is within a range of 5 to 95%.

Description

technical field [0001] The present invention relates to a substrate for a liquid crystal display element, and more particularly, to a substrate for a liquid crystal element used in a translucent type liquid crystal display element that partially transmits light. Background technique [0002] In recent years, reflective liquid crystal display elements that utilize external light have been used to realize liquid crystal displays with low power consumption in order to meet the demand for thinner and lighter portable electronic devices and equipment and for longer battery life. . However, since the display quality (especially in terms of contrast) of such a reflective liquid crystal display element largely depends on external light, compared with a transparent type liquid crystal display element using a backlight, a reflective liquid crystal display element can be used in a darker environment. Sufficient brightness cannot be obtained, resulting in degraded image quality. Japan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335B32B17/06G02B5/08G02B5/02B32B7/02B32B9/00G02F1/1333
CPCG02F1/133502G02F1/133555G02F1/1333
Inventor 新井大介荻野悦男
Owner NIPPON SHEET GLASS CO LTD
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