Optical modulation element including subelectrodes

• US 5,225,919 A
• Filed: 06/20/1991
• Issued: 07/06/1993
• Est. Priority Date: 06/21/1990
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nakao, Kenji, Wakita, Naohide
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): TRICE, RONALD
• Application Number:
  US07/718,256
• Time in Patent Office: 747 Days
• Field of Search: 359/54, 359/55, 359/56, 359/87, 340/784, 340/793
• US Class Current: 349/144
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals
• CPC Class Codes: G02F 2203/30 Gray scale
• CPC Class Codes: G09G 2310/06 Details of flat display driving waveforms
• CPC Class Codes: G09G 2310/065 Waveforms comprising zero voltage phase or pause
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/2074 using sub-pixels
• 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
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
• CPC Class Codes: G09G 3/364 with use of subpixels

Abstract

An optical modulation element capable of displaying gradations and including common electrodes, segment electrodes and subelectrodes provided for each of the common electrodes such that each of the subelectrodes is connected to two of the common electrodes by electrical elements.

Claims

1. An optical modulation element comprising:

a plurality of n common electrodes, wherein n denotes an integer of 2 or more;

m subelectrodes which are electrically connected to each of the common electrodes by electrical elements, wherein m denotes an integer of 1 or more; and

a plurality of segment electrodes which confront the common electrodes and the subelectrodes;

wherein, when a first one of the m subelectrodes is electrically connected to an i-th one of the common electrodes, wherein i denotes an integer from 1 to n, an m-th one of the m subelectrodes is electrically connected to one of the common electrodes other than the i-th one of the common electrodes.

2. An optical modulation element as claimed in claim 1, wherein the m-th one of the m subelectrodes is electrically connected to an (i-1)-th one of the common electrodes.

3. An optical modulation element as claimed in claim 2, wherein one of the electrical elements which is disposed between the (i-1)-th common electrode and the i-th common electrode, and which is disposed between the (i-1)-th common electrode and the m-th subelectrode, has an impedance which is greater then that of the other electrical elements.

4. An optical modulation element as claimed in claim 1, further comprising:

a ferroelectric liquid crystal layer.

5. An optical modulation element as claimed in claim 1, wherein the electrical elements function as a means for dividing a voltage.

6. An optical modulation element as claimed in claim 1, wherein the electrical elements are resistors.

7. An optical modulation element as claimed in claim 1, wherein gaps between the common electrodes and neighboring subelectrodes have at least two kinds of distances.

8. An optical modulation element as claimed in claim 7, wherein the electrical elements comprise printed elements.

9. An optical modulation element as claimed in claim 1, wherein the electrical elements are capacitors.

10. An optical modulation element as claimed in claim 9, wherein the capacitors comprise printed capacitors.

11. An optical modulation element as claimed in claim 1, wherein the electrical elements are disposed on a substrate on which the subelectrodes are disposed.

12. An optical modulation element as claimed in claim 11, wherein the electrical elements are at least partially made of a material identical with that of the subelectrodes.

13. An optical modulation element as claimed in claim 1, wherein the electrical elements are disposed on a circuit board connected to a substrate on which the common electrodes and the subelectrodes are disposed.

14. An optical modulation element as claimed in claim 1, wherein the electrical elements are disposed on a flexible substrate connected to a substrate on which the common electrodes and the subelectrodes are disposed.

15. An optical modulation element comprising:

a plurality of common electrodes;

m subelectrodes which are electrically connected to each of the common electrodes by electrical elements, wherein m denotes an integer of 1 or more;

a plurality of segment electrodes which confront the common electrodes and the subelectrodes; and

a liquid crystal layer, disposed on both the common electrodes and subelectrodes and having a substantially uniform thickness;

wherein none of the common electrodes, the subelectrodes and the segment electrodes are connected to a fixed voltage.

16. An optical modulation element as claimed in claim 15, wherein said liquid crystal layer is

a ferroelectric liquid crystal layer.

17. An optical modulation element as claimed in claim 15, wherein the electrical elements function as a means for dividing a voltage.

18. An optical modulation element as claimed in claim 15, wherein the electrical elements function as a means for effecting a signal delay.

19. An optical modulation element as claimed in claim 15, wherein the electrical elements are resistors.

20. An optical modulation element as claimed in claim 19, wherein gaps between the common electrodes and neighboring subelectrodes have at least two kinds of distances.

21. An optical modulation element as claimed in claim 19, wherein the electrical elements comprise printed elements.

22. An optical modulation element as claimed in claim 15, wherein the electrical elements are capacitors.

23. An optical modulation element as claimed in claim 22, wherein the electrical elements comprise printed elements.

24. An optical modulation element as claimed in claim 15, wherein the electrical elements are disposed on a substrate on which the subelectrodes are disposed.

25. An optical modulation element as claimed in claim 24, wherein the electrical elements are at least partially made of a material identical with that of the subelectrodes.

26. An optical modulation element as claimed in claim 15, wherein the electrical elements are disposed on a circuit board connected to a substrate on which the common electrodes and the subelectrodes are disposed.

27. An optical modulation element as claimed in claim 15, wherein the electrical elements are disposed on a flexible substrate connected to a substrate on which the common electrodes and the subelectrodes are disposed.