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Liquid crystal display element and method for manufacturing same

A technology of liquid crystal display elements and manufacturing methods, applied in liquid crystal materials, chemical instruments and methods, optics, etc., capable of solving problems such as image retention, difficulty in dripping marks, and insufficient effects, etc., achieving excellent high-speed response and occurrence of image retention The effect that there are few occurrences of drip marks

Active Publication Date: 2013-12-11
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, like the PSA method, there is a problem of image retention on the display caused by the reactive monomer added to the liquid crystal composition, and the effect is not sufficient for the suppression of dripping traces. Development of a liquid crystal display device that maintains the basic characteristics of a liquid crystal display device and that retains images and does not cause drip marks

Method used

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  • Liquid crystal display element and method for manufacturing same
  • Liquid crystal display element and method for manufacturing same
  • Liquid crystal display element and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0223] Fabricate a first substrate (common electrode substrate) and a second substrate (pixel electrode substrate), the first substrate has a transparent electrode layer and a color filter layer composed of a transparent common electrode, and the second substrate has The pixel electrode layer of the transparent pixel electrode driven by the source element.

[0224] A vertical alignment film material containing a polymerizable liquid crystal compound and a polymerization initiator was coated on each of the common electrode substrate and the pixel electrode substrate by spin coating to form a precursor layer of a vertical alignment film with a thickness of 200 nm. As a vertical alignment film forming material, UCL-011-K1 (manufactured by DIC Corporation) was used.

[0225] The substrates coated with the material for forming a vertical alignment film were heated in a constant temperature bath at 70° C. for 15 minutes to make the polymerizable liquid crystal compound in the materi...

Embodiment 1

[0233] The liquid crystal display element of embodiment 1 according to figure 2 The slits of the pixel electrode as shown have pretilt angles in different directions in four sections, and after the polymerizable compound is cured, the pretilt angles can be maintained even when the AC electric field is cut off. The maintained pretilt angle was 87°.

[0234] It can be seen that the liquid crystal display element of Example 1 obtained in this way exhibits excellent response speed as shown in Table 1, drip marks are less likely to occur, and is also excellent in image retention.

[0235] [Table 1]

[0236] T NI / ℃

Embodiment 2

[0275] As a material for forming a vertical alignment film, a polyimide solution containing 3% of a polyimide precursor (trade name: JALS2131-R6, manufactured by JSR Corporation) containing a reactive group represented by the following formula (V-2) is used. A liquid crystal display element of Example 2 was obtained in the same manner as in Example 1, except that a 3% solution of a polymeric compound was obtained.

[0276]

[0277] About the liquid crystal display element of Example 2, it carried out similarly to Example 1, and measured image retention and drip marks. The results are shown in Table 8.

[0278] As a result, it can be seen that the liquid crystal display element of Example 2 is inferior to the liquid crystal display element of Example 1, but exhibits excellent response speed, drip marks are less likely to occur, and is also excellent in image retention.

[0279] [Table 8]

[0280] Dripping Trace Evaluation

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PUM

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Abstract

Provided are a liquid crystal display element, in which dropping stains do not occur easily during manufacturing without causing degradation of various characteristics for the liquid crystal display element such as dielectric anisotropy, viscosity, upper limit temperature for nematic phase, and rotational viscosity (gamma1) or in burn-in characteristics for the liquid crystal display element, and a method for manufacturing the same. This liquid crystal display element (10) is characterized by having a liquid crystal composition layer (13) sandwiched between a first substrate (11) and a second substrate (12) and vertical orientation films (16, 17) that are formed from a cured product of a polymerizable liquid crystal compound and also by a liquid crystal composition constituting the liquid crystal composition layer (13) containing a compound represented by the general formulas (I) and (II).

Description

technical field [0001] The present invention relates to a liquid crystal display element useful as a component of a liquid crystal TV or the like, and a method for manufacturing the same. Background technique [0002] Liquid crystal display elements are used in various measuring instruments represented by clocks and electronic calculators, automotive panels, word processors, electronic notebooks, printers, computers, televisions, clocks, advertising display boards, etc. As liquid crystal display methods, the representative liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, vertical alignment type (vertical alignment, VA) using TFT (thin film transistor), IPS ( plane conversion) type, etc. The liquid crystal composition used in these liquid crystal display elements is required to be stable against external factors such as moisture, air, heat, light, etc., to display a liquid crystal phase in as wide a temperature range as poss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337G02F1/13
CPCG02F1/133788G02F1/1337C09K19/30C09K19/3003C09K19/56C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016
Inventor 小川真治岩下芳典栗山毅
Owner DIC CORP
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