JPS6141186A - Simultaneous color data writing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a color display device connected to a computer system.

Conventional Structures and Problems Generally, compared to monochrome display devices, color display devices require a plurality of display data memories for storing display data according to the number of display colors.

FIG. 1 shows an example of the configuration of display-related parts of a conventional color display device. 1 is a data bus, 2 is a display data memory, and 3 is a display section. The display data memories 2 are composed of N display data memories 2 corresponding to color display, and the ON display data memories 2 are each independently connected to a data bus. Therefore, when writing data to be displayed into the display data memories 2, it is necessary to write into each of the N display data memories 2 separately. This has the disadvantage that it takes N times as long as monochrome display.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks, and aims to shorten the time required to write color data to be displayed into a display data memory to approximately the same time as the time required to write monochrome data.

Structure of the Invention The present invention comprises a brightness data creation means for creating black and white binary brightness data, an N-bit color designation register for designating a color pattern, and each bit of the color designation register and the output of the brightness data creation means. N sets of AND gates that take the logical product of
This is a color data simultaneous writing device equipped with N display data memories into which respective outputs of AND gates are written.
Since it is possible to write to the display data memory of
This makes it possible to perform color display at high speed.

DESCRIPTION OF EMBODIMENTS FIG. 2 is a block diagram of an embodiment of the present invention, 10 is a luminance gator creation means for creating black and white binary luminance data, 12
is an N-bit color specification register that specifies the color pattern,
13 is N sets of AND gates that take the logical product of each bit of the color designation register 12 and the output of the luminance data creation means 1o;
Reference numeral 14 designates N display data memories into which the respective outputs of the AND gates 13 are written.

The luminance data creating means 10 creates binary monochrome data indicating a bright spot and a dark spot, with '1' representing a bright spot and 0" representing a dark spot, respectively. The output of this luminance data generating means 1o is commonly connected to all AND gates 13. AND
08 AND gates 1 to which each bit of the output of the color designation register 12 is connected to each gate 13.
3 are connected to respective write inputs of display data memory 14. According to such a configuration, when the output of the luminance data generation means 1o is 0'', all 0'' is written in the display data memories 14-1 to 14-N, and the output of the luminance data generation means 1o is 1. '', the contents of each bit of the output of the color designation register 12 are written into each of the display data memories 14-1 to 14-N.

By adopting the above configuration, when writing data of the same color, once a color pattern is first set in the color specification register 12, the brightness data is created by the brightness data creation means 1o, and then the display data is Color display data can be written to all display data memories 14 in one memory write operation.

Note that when the number of data bits written at one time in the display data memory 14 is 2 bits or more (M bits), each AND gate 13-1 to . N to M A
It is sufficient to replace it with an ND gate and set the number of output bits of the luminance data generating means 10 to M bits.

Furthermore, a NAND gate may be used as the AND gate 13 in the embodiment. However, when a NAND gate is used, inverted contents are written in the display data memory 14, so when reading data from the display data memory 14 during display, it is sufficient to invert the data.

Effects of the Invention According to the present invention, since color data can be written to a plurality of display data memories in one memory write operation, color display can be performed at high speed, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of the configuration of a conventional color display device.
FIG. 2 is a circuit diagram showing the configuration of one embodiment of the present invention, and FIG. 3 is a circuit diagram showing another embodiment of the AND gate configuration. 10... Luminance data creation means, 12...
・Color specification register, 13...AND gate, 1
4...Display data memory. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A brightness data creation means for creating black and white binary brightness data, an N-bit color designation register for designating a color pattern, and a logical product of each bit of the color designation register and the output of the brightness data creation means. A color data simultaneous writing device comprising N sets of AND gates and N display data memories into which respective outputs of the AND gates are written, and writing color data into each of the display data memories at the same time. .