Matrix type liquid crystal display panel

• US 4,231,640 A
• Filed: 06/30/1978
• Issued: 11/04/1980
• Est. Priority Date: 07/07/1977
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Wada, Tomio, Funada, Fumiaki, Nonomura, Keisaku, Uede, Hisashi
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/921,062
• Time in Patent Office: 858 Days
• Field of Search: 340/784, 340/716, 350/335, 350/336
• US Class Current: 349/82
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells

Abstract

An XY matrix type liquid crystal display panel having a plurality of X electrodes aligned at a given interval in one direction, a plurality of Y electrodes alinged at a given interval in a direction normal to the one direction and a layer of liquid crystal composition disposed between the X and Y electrodes. While an electrode layer forming the Y electrodes is shaped connect divided picture element electrodes, the counterpart forming the X electrodes is arranged to confront with two or more picture element electrodes along the Y axis. Further, each of the Y electrodes is divided into two along the Y axis. A contact area of each of the divided by two Y electrodes extends toward two opposing ends of a support where the Y electrodes are disposed. In a preferred form, the matrix type liquid crystal panel comprises two or more layers of liquid crystal composition and the X and Y electrodes are so arranged that electric field-responsive operating regions of the respective liquid crystal composition layers never are overlapped with one another.

Claims

1. An XY matrix liquid crystal display comprising:

a plurality of X electrodes aligned at given spaced intervals in a first direction;

a plurality of Y electrodes aligned at given spaced intervals in a second direction normal to said first direction, adjacent electrode pairs of said plurality of Y electrodes being interleaved with each other to form spaced electrode areas which alternate in said first direction; and

a layer of liquid crystal composition disposed between said plurality of X electrodes and said plurality of Y electrodes;

wherein the dimensions of each of said X electrodes in said first direction is substantially the same as the dimension of two of said interleaved electrode areas in said first direction, each of said X electrodes being superimposed over two of said electrode areas from each of said electrode pairs.

2. The XY matrix type liquid crystal display panel as defined in claim 1 wherein said panel comprises two or more layers of liquid crystal composition disposed between X and Y electrodes;

said X and Y electrodes arranged so that the electric field-responsive operating regions of the respective liquid crystal compostion layers do not overlap.

5. The XY matrix type liquid crystal display panel of claims 1 or 3 wherein said layer of liquid crystal composition is an approximately 90 degrees twisted nematic liquid crystal consisting of nematic liquid crystal or cholesteric liquid crystal with the inherent pitch longer than 40 μ

m which has the positive dielectric anisotropy, the direction of molecular alignment being periodic and the difference Δ

n between reflective index for abnormal light and reflection index for normal light being defined below,

space="preserve" listing-type="equation">d·

Δ

n≧

2 (μ

m)

wherein d is the thickness of said layer of liquid crystal composition.

3. An XY matrix liquid crystal display panel comprising:

at least two liquid crystal display layers, each of said liquid crystal display layers including,

a plurality of X electrodes aligned at given spaced intervals in a first direction,

a plurality of Y electrodes aligned at given spaced intervals in a second direction normal to said first direction, and

a layer of liquid crystal composition disposed between said plurality of X electrodes and said plurality of Y electrodes,

said plurality of X electrodes and said plurality of Y electrodes overlapping to form electric field responsive operating regions;

said liquid crystal display layers being stacked so that said electric field responsive operating regions of the respective liquid crystal display layers are not overlapped with each other.

4. The XY matrix liquid crystal display panel of claim 3, wherein adjacent electrode pairs of said plurality of Y electrodes are interleaved to form spaced electrode areas which alternate in said first direction;

and

wherein the dimension of each of said X electrodes in said first direction is substantially the same as the dimension of two of said interleaved electrodes in said first direction, each of said X electrodes being superimposed over two of said electrode pairs to form said electric field-responsive operating regions.