Claims
- 1. A display apparatus having a plurality of picture elements (2) each capable of having any one of plural display gradations, said apparatus comprising:
- a display means (4) in which picture elements (2) are arranged in a matrix form of 2.sup.a .times.2.sup.b picture elements, where a and b are integers;
- a frame memory (15) for storing c-bit data representing one of 2.sup.c different gradations for each said picture element where c is an integer, said frame memory responding to an address input of (a+b) bits to provide a c-bit data output corresponding to a picture element identified by said (a+b)-bit address input; and
- a clock signal source for providing a clock signal;
- an address control section (18) for frequency-dividing said clock signal successively by factors ranging from 1/2 to (1/2).sup.a+b+c to obtain an output of (a+b+c) bits, wherein (a+b) of said output bits from said address control section correspond to one of said (2.sup.a +2.sup.b) picture elements in said display means and determine said (a+b)-bit address input to said frame memory, and wherein c of said output bits from said address control section identify a reference signal level corresponding to one of said 2.sup.c display gradations available for each picture element;
- an on-off decision section (16) for performing a comparison of the c-bit data output from said frame memory with said reference level and for producing 1-bit data output representing "on" and "off" states of said picture elements in accordance with results of said comparison; and
- timing control means (FIG. 15) for applying said 1-bit data to said picture elements and holding said 1-bit data for a predetermined period of time to drive said display means;
- 2. A display apparatus as claimed in claim 1 wherein said display means comprises:
- groups of first control electrodes comprising control electrodes for controlling said display means connected in a vertical direction;
- groups of second control electrodes comprising control electrodes for controlling said display means connected in a horizontal direction; and
- at least one display element (3) comprising picture elements each arranged at an intersection of a pair of said first and second control electrodes.
- 3. A display apparatus as claimed in claim 2 wherein said address control section achieves one cyclical operation in the period of a field of a television signal.
- 4. A large screen display apparatus comprising a plurality of display modules cooperating to display a complete picture, wherein each of said modules is constructed as defined in claim 1.
Priority Claims (3)
Number |
Date |
Country |
Kind |
61-166151 |
Jul 1986 |
JPX |
|
61-191720 |
Aug 1986 |
JPX |
|
61-25338 |
Oct 1986 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 73,661, filed July 15, 1987, now U.S. Pat. No. 4,833,542.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
58-56877 |
Dec 1983 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
73661 |
Jul 1987 |
|