Liquid crystal display device having color filters sized to prevent light leakage between pixels

• US 4,653,862 A
• Filed: 01/13/1986
• Issued: 03/31/1987
• Est. Priority Date: 10/01/1982
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Morozumi, Shinji
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Gallivan, Richard F.
• Application Number:
  US06/818,470
• Time in Patent Office: 442 Days
• Field of Search: 350/333, 350/339 R, 350/339 F
• US Class Current: 349/109
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127

Abstract

A multi-color liquid crystal display includes liquid crystal micro-shutters which open and close color filters arranged as dots in a mosaic or stripe pattern. Fine and clear color image display and color graphic display are realized in the device wherein the filters are within the LCD panel, being formed on one substrate and covered by the driving electrode.

Claims

1. A liquid crystal display device having a plurality of picture elements arranged in a matrix of columns and rows, each of said picture elements comprising:

a first substrate and a second substrate, said substrates facing each other and spaced apart for defining a space therebetween;

a first electrode formed on the surface of said first substrate facing said second substrate;

a color filter and a second electrode formed on the surface of said second substrate facing said first electrode and said first substrate;

each color filter on the second substrate having an area greater than the area of the first electrode on the first substrate with the second electrode formed on the surface of the color filter; and

a liquid crystal material filling the space between said electrodes and retained in said space.

2. A liquid crystal display device as claimed in claim 1, further including a data line and intermediate component means for connecting the data line to said first electrode through the intermediate component means, said intermediate component means being one of a thin film transistor and non-linear elements, said intermediate component being formed on said first substrate on the same surface with said first electrode.

3. A liquid crystal display device as claimed in claim 2, wherein said non-linear element is one of diodes connected oppositely and a MIM element.

4. A liquid crystal display device as claimed in claim 2, wherein all said color filters are formed on the same second substrate, and all said first electrodes are formed on the same said first substrate.

5. A liquid crystal display device as claimed in claim 2, wherein said electrodes are transparent.

6. A liquid crystal display device as claimed in claim 2, wherein said color filters represent three primary colors, each said first electrode having a shape similar to that of the opposed color filter.

7. A liquid crystal display device as claimed in claim 6, wherein said primary color filters are arranged in said matrix in a pattern of one of stripes of a first color adjacent to stripes of two other colors and a mosaic of colors.

8. A liquid crystal display device as claimed in claim 7, wherein said pattern is a mosaic, the centers of the picture elements in one row being shifted by a selected distance from the centers of the picture elements in the next adjacent row.

9. A liquid crystal display device as claimed in claim 8, wherein said selected distance is 1/2 of the distance between centers of adjacent elements in the same row.

10. A liquid crystal display device as claimed in claim 7, wherein said pattern is a mosaic, the centers of picture elements in a column being shifted by a selected difference from the centers of picture elements in the next adjacent column.

11. A liquid crystal display device as claimed in claim 10, wherein said selected distance is 1/2 of the distance between centers of adjacent elements in the same column.

12. A liquid crystal display device as claimed in claim 1, wherein said color filters represent three primary colors, each said first driving electrode having a shape similar to that of the opposed color filter.

13. A liquid crystal display device as claimed in claim 12, and further comprising a passivation layer formed on said color filters between said color filters and said second driving electrode, said passivation layer preventing interaction between said filters and said electrode materials.

14. A liquid crystal display device as claimed in claim 13, wherein said first and second substrates are glass, and said passivation layer is SiO2.

15. A liquid crystal display device as claimed in claim 1, wherein said color filters are formed of a water soluble organic resin colored with a coloring material.

16. A liquid crystal display device as claimed in claim 15, wherein said organic resin is one of polyvinyl alcohol and gelatine.

17. A liquid crystal display device as claimed in claim 1, wherein a layer of glass separates said color filters from said second electrode.

18. A liquid crystal display device as claimed in claim 1, wherein said color filters represent three primary colors and white, said picture element being arranged in blocks of four including said primary colors and white.

19. A liquid crystal display device as claimed in claim 1, wherein said first and second substrates are transparent.

20. A liquid crystal display device as claimed in claim 1, wherein said color filter is formed directly on the surface of said second substrate and said second electrode covers said color filter.

21. A liquid crystal display device as claimed in claim 1, wherein said second driving electrode is disposed directly on adjacent to said second substrate and said color filter covers said second driving electrode.

22. The liquid crystal display device of claim 1, wherein the second electrode is a portion of a common electrode of the device which covers a plurality of the color filters of the picture elements of the matrix.

23. A liquid crystal display device having a plurality of picture elements arranged in a matrix of columns and rows, each of the picture elements comprising:

a first substrate and an opposed spaced apart second substrate for defining a space therebetween;

a first electrode on the surface of the first substrate facing the second substrate;

a color filter and a second electrode on the surface of the second substrate facing the first electrode and the first substrate;

a liquid crystal material filling the space between the electrodes and retained in the space; and

means for reducing the leakage of incident light in the regions between the first electrodes of adjacent picture elements of the matrix.

24. The liquid crystal display device of claim 23, wherein the means for reducing the leakage of incident light includes a color filter on the second substrate having an area greater than the area of the first electrode on the first substrate.

25. The liquid crystal display device of claim 23, wherein the means for reducing the leakage of incident light includes a black frame between picture elements of the matrix.

26. The liquid display device of claim 25, wherein the black frame is a black pigment disposed between adjacent color filters of the matrix.

27. The liquid crystal display device of claim 25, wherein the black frame is a black pigment disposed between adjacent first electrodes of the matrix.

28. The liquid crystal display device of claim 25, further including a plurality of parallel and spaced apart data lines on the first substrate adjacent to the first electrodes, polarizers disposed on the outer surfaces of the substrates with the axes of polarization substantially perpendicular to each other and circuit means including means for applying a voltage to the liquid crystal material and the means for reducing leakage of incident light includes means for continually applying a video signal to the data lines so that the data lines appear black to a viewer.