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Liquid crystal display element and method for manufacturing same

A technology of liquid crystal display element and manufacturing method, which is applied in the directions of liquid crystal materials, chemical instruments and methods, optics, etc., and can solve the problems such as no effective method yet found, low viscosity of liquid crystal composition, etc.

Pending Publication Date: 2018-11-09
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, for increasing the response speed of the rising speed of the liquid crystal display device, driving methods such as lowering the viscosity of the liquid crystal composition, increasing the dielectric constant, lowering the elastic constant, imparting a pretilt angle, or an overdrive method are actually used. However, regarding the rate of decline, currently no effective method has been found other than lowering the viscosity of the liquid crystal composition, and improvement is desired.

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

[0523] A composition (Δn 0.103, viscosity η 16.5, Δε-3.1) shown in the following (LCN-1) was prepared as an N-type liquid crystal composition. The N-type liquid crystal composition (LCN-1) was heated to 60° C., and the solid polymerizable compound (V1-1-1) and the polymerizable compound (V1-1-2) were mixed and dissolved. The polymerizable compounds (V1-1-1) and (V1-1-2) were uniformly dissolved at room temperature, and it was confirmed with a polarizing microscope that a nematic liquid crystal phase was exhibited. Irgacure 651, a polymerization photoinitiator, was mixed with this solution to prepare a polymerizable liquid crystal composition. Table 1 shows the composition table of the prepared polymerizable liquid crystal composition.

[0524] In such a way that uniaxial alignment (horizontal alignment) of liquid crystals can be obtained, a herringbone pattern electrode vertical alignment (PVA) cell coated with a polyimide vertical alignment film with a cell gap of 3.6 μm...

Embodiment 2～5

[0541] In the same manner as in Example 1, the compositions of Examples 2 to 5 in Table 1 were injected into the cell.

[0542] After the injection, the glass cell was taken out, and the injection port was sealed with a sealant 3026E (manufactured by Threebond). Using an ultraviolet LED light source with a wavelength of 365nm, the irradiation intensity is 15mW / cm at 25°C 2 UV light for 80 seconds. Use a square wave with a frequency of 1kHz and 2.39V to 7.5V as the voltage, and adjust the time appropriately from the time when the ultraviolet ray is irradiated, and apply it for 5 seconds to 15 seconds. Oriented vertically, a herringbone type PVA unit is produced. This makes it possible to form a polymer network of parallel orientation components and a polymer network of vertical orientation components.

[0543] After the ultraviolet irradiation was completed, the slit direction was arranged to be inclined at 45 degrees with respect to any of the crossed Nicol polarizer...

Embodiment 6

[0546] In the same manner as in Example 1, the composition of Example 6 in Table 1 was injected into the cell.

[0547] After the injection, the glass cell was taken out, and the injection port was sealed with a sealant 3026E (manufactured by Threebond). Using an ultraviolet LED light source with a wavelength of 365nm, the irradiation intensity is 15mW / cm at 25°C 2 UV light for 80 seconds. A rectangular wave with a frequency of 1 kHz and 2.45 V was used as a voltage, and after 12 seconds from the start of ultraviolet irradiation, the voltage was set to 0 V in the state of ultraviolet irradiation, and the vertical orientation was returned to produce a herringbone PVA unit. This makes it possible to form a polymer network of parallel orientation components and a polymer network of vertical orientation components.

[0548] After the ultraviolet irradiation was completed, the slit direction was arranged to be inclined at 45 degrees with respect to any of the crossed Nicol...

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Abstract

The present invention provides a liquid crystal display element which has high transmittance and excellent high-speed response in vertically aligned liquid crystal displays, such as PVA or MVA, and parallel aligned liquid crystal displays, such as IPS, FFS, or TN mode displays, by suppressing an increase in driving voltage, suppressing a decrease in birefringence, improving transmittance, and improving fall time in a liquid crystal. The present invention also provides a method for manufacturing said liquid crystal display element. Provided is a liquid crystal display element, wherein a liquidcrystal composition sandwiched between two transparent substrates-at least one of which has an electrode-contains a polymer or a copolymer, the content of the polymer or the copolymer is at least 0.5mass% and less than 40 mass% of the combined mass of the liquid crystal composition and the polymer or copolymer, the polymer or the copolymer forms a polymer network, and the polymer network has uniaxial refractive index anisotropy or an easy-alignment axis, and two or more different alignment states.

Description

technical field [0001] The invention relates to a liquid crystal display element and a manufacturing method thereof. Background technique [0002] Although LCD TVs are widely used, with the high image quality brought about by large size, the moving speed of displayed objects moving on the screen is faster than that of small LCD TVs. Therefore, it is required to increase the response speed of LCD and improve the video quality. [0003] A feature of the field sequential full-color display system that does not require color filters is the use of backlights that are lit 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 mode, the frame time is 5.6ms, requiring high-speed response. [0004] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C09K19/38G02F1/13
CPCC09K19/38G02F1/13G02F1/1337G02F1/133788G02F1/137
Inventor 藤泽宣小寺史晃
Owner DIC CORP
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