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Liquid crystal element

A technology of liquid crystal elements and liquid crystal layers, applied in nonlinear optics, instruments, optics, etc., can solve the problems of unstable anti-twist orientation state and increase threshold voltage

Active Publication Date: 2012-07-04
STANLEY ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the anti-twisted alignment state of the liquid crystal display device of the above-mentioned precedent example 1 is unstable. By applying a high voltage to the liquid crystal layer, the anti-twisted alignment state can be obtained, but the alignment will shift to the forward twisted state as time passes. bad condition
In addition, although the liquid crystal element of the prior example 2 has the advantage of lowering the threshold voltage as described above, it shifts to a forward alignment state immediately (for example, in about a few seconds) after the voltage is turned off, and there is a disadvantage that the threshold voltage is increased instead.
In addition, the inverse TN-type liquid crystal element in the prior example 3 still has room for further improvement from the viewpoint of electro-optical characteristics.

Method used

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Examples

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Embodiment 1

[0047] The liquid crystal element of Example 1 was produced under the following conditions, and the characteristic was evaluated. First, two glass substrates with an ITO film were prepared, washed and dried. Then, an alignment material was applied to the surface of each glass substrate. As an alignment material, a horizontal alignment material that imparts a pretilt angle of 1 to 2 degrees to liquid crystal molecules is suitably used. The alignment material of one glass substrate was sintered and rubbed. Thereafter, a spacer material is spread on the glass substrate, and a sealing material is printed. A substance having a particle diameter of 4 μm was used as the spacer material. Also, the alignment material was sintered on another glass substrate, and a rubbing treatment was performed on it. Thereafter, the two glass substrates are bonded together to form a unit, and a liquid crystal material is injected into it. Regarding the bonding of two glass substrates, the directi...

Embodiment 2

[0050] A liquid crystal element was produced under the same conditions as in Example 1 above, and its characteristics were evaluated. Wherein the following conditions are different from Example 1. In this example, the value of d / p0 is 0.2 or 0.4, and the addition amount of the ultraviolet curable resin is 4 wt%, 5 wt%, 6 wt%, and 7 wt%. In addition, in this example, ultraviolet irradiation was performed using a mask having a grid-like (matrix-like) pattern. Figure 9 The structure of the mask used for ultraviolet irradiation in this example is shown.

[0051] As shown, the grid-like pattern of the mask has a line width of about 180 μm and a line pitch of 20 μm. In addition, the wavelength of ultraviolet rays is 365nm, and the irradiation intensity is 80mW / cm 2 . Mask exposure was performed with the exposure intensity repeated 4 times for 1 minute each, and finally the mask was removed and exposure was performed for 1 minute (full-surface irradiation). At this time, voltag...

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Abstract

The invention provides an inverse TN liquid crystal element which can improve the stability of the orientation state of inverse distortion and can improve the features of electrooptics. The liquid crystal element comprises a first substrate and a second substrate, each of which is applied with an orientation processing. The first and second substrate are disposed with respect to each other. The liquid crystal element also comprises an liquid crystal layer which is disposed between one surface of the first substrate and one surface of the second substrate, and a plurality of polymer walls which are disposed in the liquid crystal layer along the direction of the layer thickness. The direction of the orientation processing of the first and second substrates is set to be a first orientation state which makes it easy for the liquid crystal molecules in the liquid crystal layer to generate distortion towards a first rotation. The liquid crystal layer includes chiral materials and has an orientation state distorting towards the first rotation direction. The chiral materials enable the liquid crystal molecules to distort towards a second rotation direction, opposite to the first rotation direction.

Description

technical field [0001] The present invention relates to techniques for improving electro-optical characteristics of liquid crystal elements. Background technique [0002] In the liquid crystal display device disclosed in Japanese Patent No. 2510150 (Patent Document 1), the liquid crystal molecules are twisted in a rotational direction opposite to a rotational direction limited by a combination of directions of alignment treatment performed on a pair of opposing substrates. Orientation, thereby improving the electro-optical characteristics (previous example 1). The operation mode of such a liquid crystal display device (liquid crystal element) is called a reverse TN (Reverse Twisted Nematic, reverse twisted nematic) type. [0003] In addition, Japanese Patent Application Laid-Open No. 2007-293278 (Patent Document 2) discloses a liquid crystal element to which a chiral agent is added, and the chiral agent is oriented in the direction of the alignment treatment performed on a ...

Claims

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Application Information

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IPC IPC(8): G02F1/1337G02F1/1333G02F1/1339G02F1/139
Inventor 都甲康夫大池勇斗高桥泰树
Owner STANLEY ELECTRIC CO LTD