Liquid crystal display apparatus

A liquid crystal display, liquid crystal display technology, applied in the field of liquid crystal displays

Inactive Publication Date: 2003-12-03
MINOLTA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, liquid crystal displays using chiral nematic liquid crystals have the disadvantage of requiring high voltages to write images on the display

Method used

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Examples

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Effect test

no. 1 example

[0048] (First embodiment; see Figure 2)

[0049] 2(A) and 2(B) show the liquid crystal display 1 of the first embodiment of the present invention. An electrode 12a, an insulating layer 13, an electrode 12b, and a reference control layer 14 are provided on the lower substrate 11. An electrode 22 and a reference control layer 24 are provided on the upper substrate 21. Between the substrates 11 and 21 is filled with chiral nematic liquid crystals, which are prepared by adding a chiral agent to the nematic liquid crystals, so that the liquid crystals exhibit bile at room temperature. Steroid phase. The part of one pixel is schematically shown in FIG. 2(A) and FIG. 2(B).

[0050] As the liquid crystal, various liquid crystals can be used as long as it exhibits a cholesteric phase at room temperature. The dielectric constant of the anisotropy of the liquid crystal can be positive or negative.

[0051] For the substrates 11 and 21, various materials can be used. Glass and plastic films s...

no. 2 example

[0077] (Second embodiment; see Figure 7-9)

[0078] Fig. 7(A) and Fig. 7(B) show a liquid crystal display 2 according to a second embodiment of the present invention. In the liquid crystal display 2, an electrode 12a, an insulating layer 13, an electrode 12b, and a reference control layer 14 are provided on the lower substrate 11. On the upper substrate 21, an electrode 22 and a reference control layer 24 are provided. Between the substrates 11 and 21, a chiral nematic liquid crystal is filled. A part of one pixel is schematically shown in FIG. 7(A) and FIG. 7(B).

[0079] The electrodes 12a and 12b are interdigital transducers, and the fingers of each interdigital transducer are so narrow that there are multiple fingers in one pixel. The fingers of the interdigital transducer extend in the same direction. Picture 9 The interdigital transducer corresponding to electrode 12a is shown. Such as Picture 9 As shown, the gasket 12a 1 Extend in the direction perpendicular to the finger...

no. 3 example

[0084] (The third embodiment; see Figure 10-12)

[0085] Fig. 10(A) and Fig. 10(B) show a liquid crystal display 3 according to a third embodiment of the present invention. An electrode 12a, an insulating layer 13, an electrode 12b, and a reference control layer 14 are provided on the lower substrate 11. An electrode 22a, an insulating layer 23, an electrode 22b, and a reference control layer 24 are provided on the upper substrate 21. The chiral nematic liquid crystal is filled between the substrates 11 and 21. In FIG. 10(A) and FIG. 10(B), only a part of one pixel is shown.

[0086] Such as Picture 11 As shown, the electrode 12a is connected to the first scan signal driving circuit 28A, and the electrode 22a is connected to the second scan signal driving circuit 28B. The electrodes 12b and 22b are connected to the data signal driving circuit 29. As shown in Figure 12 (A) and Figure 12 (B), the electrodes 12a and 22a are interdigital transducers, the structure of which has been re...

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PUM

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Abstract

A liquid crystal display apparatus which has: a liquid crystal display which has chiral nematic liquid crystal between a pair of substrates with electrodes thereon and which makes a display by use of selective reflection of the liquid crystal; and a driving circuit for driving the liquid crystal by applying voltages to the electrodes. When an electric field of a specified strength is applied to the chiral nematic liquid crystal, the liquid crystal changes the direction of the helical axis without untwisting. By using this characteristic, the direction of the helical axis of the liquid crystal is changed by changing the direction of the electric field applied thereto, and thereby, the liquid crystal is set to a planar state or a focal-conic state. In this way, writing on the liquid crystal is carried out.

Description

Technical field [0001] The present invention relates to a liquid crystal display, and more specifically, to a liquid crystal display having a liquid crystal exhibiting a cholesteric phase between a pair of substrates and performing display by using the selective reflection of the liquid crystal. Background of the invention [0002] In recent years, various liquid crystal displays have been developed and provided. Among these types, reflective liquid crystal displays perform display by reflecting (external light) light from the environment. Therefore, the reflective liquid crystal display consumes less electric power for display than the transmissive liquid crystal display, and for this reason, this type of liquid crystal display is used as a display for mobile devices such as mobile phones. In addition, displays that consume less electric power have been researched and developed, and reflective liquid crystal displays with storage effects have been proposed. [0003] In the SID I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/139G02F1/133G02F1/1343G02F1/137
CPCG02F1/13718G02F2001/134381G02F1/134363G02F1/134381
Inventor 泉倫生宮井三嘉
Owner MINOLTA CO LTD
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