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Liquid crystal display element

A technology for liquid crystal display elements and liquid crystal compositions, applied in the directions of liquid crystal materials, instruments, optics, etc., can solve the problems of prolonged time, no effective method found, liquid crystal decomposition, etc.

Active Publication Date: 2018-03-27
DIC CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these components also have room for improvement from the standpoint of high-speed responsiveness
In particular, regarding the improvement of high-speed response of the rising speed of liquid crystal display devices, low viscosity of liquid crystal composition, high dielectric constant, low elastic constant, provision of pretilt angle, or improvement of driving methods such as over drive method Various methods have been put into practical use, but regarding the rate of descent, currently no effective method has been found other than lowering the viscosity of the liquid crystal composition, and improvement is desired
[0007] In addition, in the PSA display, since the photoreactivity of the liquid crystal composition containing the polymerizable compound used is low, it is difficult to efficiently perform photopolymerization of the polymerizable compound, and there is a problem that the time required for device production becomes longer.
Furthermore, in the curing process of the polymerizable compound in the process, excessive UV irradiation or short-wavelength UV irradiation of 300 nm or less is performed in order to achieve sufficient curing, so there is a problem that the liquid crystal is decomposed and the VHR of the panel is lowered (patent Document 7)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0627] 97% of the N-type liquid crystal composition (LCN-1), 2.94% of the polymerizable compound (V1), and 0.06% of the photopolymerization initiator No. 1 described in Table 10 below (as the ratio of these polymerizable compounds and the photopolymerization initiator The polymeric composition 3%) of the mixture was mixed to prepare composition 1.

[0628] After forming a polyimide alignment film with a cell gap of 3 μm on a glass substrate so that the homeotropic alignment of the liquid crystal can be obtained, it is carried out so that the pretilt angle becomes 1° to 2° with respect to the normal direction of the substrate. Rubbing Orientation Treatment, making rubbed oriented cells with ITO.

[0629] Composition 1 was heated to 60° C. to dissolve the solid polymerizable compound (V1). Regarding composition 1, it was confirmed by a polarizing microscope that the polymerizable compound (V1) was uniformly dissolved at room temperature and that a nematic liquid crystal phase a...

Embodiment 2～23、 comparative example 1～3

[0640] Except having adjusted the liquid crystal composition, polymeric compound, and initiator as shown in following Table 1, it carried out similarly to Example 1, and produced the liquid crystal display element of VA mode.

[0641] Using a polarizing microscope, when the produced unit is placed between two orthogonal polarizers, it becomes a dark field. Even if the unit is rotated in the azimuth direction, the blackness of the dark field does not change, so it is confirmed that the polymer is vertically oriented and The direction of the optical axis of the network is the same as the direction of the easy-orientation axis of the liquid crystal composition.

[0642] The composition for producing the unit was left at 20° C. for one week, and no crystallization by the polymerizable compound was confirmed. Response time was measured by applying a 60 Hz rectangular wave to the obtained VA mode liquid crystal display element. The results are shown in Table 1. In Comparativ...

Embodiment 24～25、 comparative example 4～5

[0647] Except having adjusted the liquid crystal composition, polymerizable compound, and photoinitiator as shown in following Table 2, it carried out similarly to Example 1, and produced the liquid crystal display element of VA mode.

[0648] Using a polarizing microscope, when the produced unit is placed between two orthogonal polarizers, it becomes a dark field. Even if the unit is rotated in the azimuth direction, the blackness of the dark field does not change, so it is confirmed that the polymer is vertically oriented and The direction of the optical axis of the network is the same as the direction of the easy-orientation axis of the liquid crystal composition.

[0649] The composition for producing the unit was left at 20° C. for one week, and no crystallization by the polymerizable compound was confirmed. Response time was measured by applying a 60 Hz rectangular wave to the obtained VA mode liquid crystal display element. The results are shown in 2.

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Abstract

The present invention provides a liquid crystal display element in which the fall time of a liquid crystal is improved, thereby yielding exceptional high-speed response and allowing polymer networks to be formed at high sensitivity, even at relatively long UV irradiation wavelengths, without adversely affecting the voltage hold rate (VHR); it being possible to manufacture said display element exceptionally efficiently. Provided is a liquid crystal display element in which a liquid crystal composition that contains one or more liquid crystal compounds held between two transparent substrates contains a polymer or copolymer that is a cured polymerizable composition containing one or more polymerizable compounds and a photopolymerization initiator having a maximum absorption wavelength peak at310-380 nm; the polymerizable composition content relative to the total weight of the polymerizable composition and the liquid crystal composition being at least 1% by mass to less than 40% by mass.

Description

technical field [0001] The invention relates to a liquid crystal display element. Background technique [0002] The field-sequential full-color display system that does not require a color filter is characterized by using a backlight device that lights up in the order of "red→green→blue". In general CRT and liquid crystal display, the frame time is 16.7ms, but in the field sequential full-color display method, a frame time of 5.6ms is required for high-speed responsiveness. [0003] As an index showing high-speed responsiveness, the sum of τd and τr can be cited. τd is the falling response time of the liquid crystal, and τr is the rising response time of the liquid crystal. In order to meet the high-speed responsiveness of the field sequential full-color display mode, it is expected that the sum of τd and τr is less than 1.5ms. [0004] Currently, liquid crystal materials called nematic liquid crystals on the market are generally used in flat panel displays such as TVs, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08F20/30C09K19/38C09K19/54G02F1/13
CPCC09K19/54C09K19/14C09K19/2014C09K19/3028C09K19/3066C09K2019/0448C09K2019/122C09K2019/123C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016C09K2019/3027C09K2019/3037G02F1/133365G02F1/133707G02F2203/30G02F1/1334G02F1/134381C08F222/1025C08F222/1035C08F220/10C09K19/38G02F1/1337C08F20/30C09K19/3852G02F1/133514G02F1/133528G02F1/1343
Inventor 小寺史晃张琴姫藤泽宣长谷部浩史高津晴义后藤麻里奈须藤豪山本修平
Owner DIC CORPORATION
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