JPS6172293A - Color graphic display unit - 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 the Invention] The present invention relates to a color graphic display device that displays graphics using a plurality of colors on a display.

[Conventional technology]

This is usually shown.

Conventionally, in such graphic processing devices, for example, there has been one in which a write controller directly accesses a graphic memory in units of one bit to write an image. However, in this graphic processing device, when performing color display, for example, R, G.

When performing color display using the B memory plane, data corresponding to color information must be sent to each of the R, G, and B memory planes each time 11iIiii element writing is performed. For this reason, in this graphic display device, when displaying in color, the number of data transfers during writing increases, resulting in a problem of poor efficiency.

[Problem that the invention seeks to solve]

The present invention has been made in order to eliminate the above-mentioned problems, and an object of the present invention is to realize a color graphic display device in which color information can be written efficiently.

[Means for solving problems]

The present invention provides a color graphic display device that writes an image to be displayed in a graphic memory, reads the image from the graphic memory, and displays the image using multiple colors on a display device, in which color information used for writing the graphic is set. a plurality of color registers, a color selection register in which color information about the pixel to be written is set at any time, a coordinate register in which coordinate information about the pixel to be written is set at any time, and the color selection register and the coordinates. a selection signal generation circuit that generates a selection signal according to the contents of the register; and a data selection circuit that selects a color register set with a desired color from among the plurality of color registers based on the selection signal. and a write controller that transfers information on the color selected by the data selection circuit to the graphic memory.

〔Example〕

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a color graphic display device according to the present invention.

In FIG. 1, 10 is a processor, 20 is an information processing unit, 50 is a write controller, 40 is a graphic memory, 50 is a display controller, and 60 is a display device.

The processor 10 calculates and outputs the coordinates of characters, figures, etc. to be written into the graphic memory 40. These coordinates are the X and Y coordinates on the screen of the display 60.

The information processing unit 20 outputs information on the color and coordinates to be written into the graphic memory 40 based on the signal from the processor t10.

The write controller 30 controls writing to the graphic memory 40 by the information processing section 20.

The graphic memory 40 includes, for example, R, G, H memory planes 4n1. to □ and 403.

The display controller 50 controls the display on the display 60.

The main structure of such a color graphic display device is shown in FIG. In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals.

In FIG. 2, 21 is a color register, 211
A plurality of numbers from 21n to 21n are provided. These color registers 211-21. The color information used to write the figure is set in . These registers 2
Among the information set to 11 to 21, the information regarding red is RcoL1 to RCOLn. Information about green and blue GCOL1- GCOLB and “COf, t~
The same applies to BCOLn.

Reference numeral 22 is a color selection register, in which color information about the pixel to be written is set as needed.

23 is a coordinate register, which is an X on the display screen of the display device 60 for the pixel to be written.

Information on the Y coordinate is set at any time.

24 is a selection signal generation circuit, and color selection register 2
2 and outputs a selection signal according to the contents of the coordinate register 23.

25 is a data selection circuit, which corresponds to the R, G, B memory brains 401, 402, and 403;
25□ and 253 are provided. These data selection circuits 251-253 select the one in which the color desired to be displayed is set from among the color registers 211-21n based on the selection signal.

[Effect]

Next, the operation of such a color solid-state display device will be explained.

The processor 10 sets color information used for writing graphics in the color registers 211 to 21n.

Here, the processor 10 sets color information about the pixel to be written into the color selection register 22. Next, the processor 10 sets the X and Y coordinates of the pixel to be written into the coordinate register 23. Here, when the processor 10 generates a write command, the selection signal generation circuit 24 generates a selection signal according to the contents of the color selection register 22 and the coordinate register 23. As a result, the data selection circuits 251 to 253 select one of the color registers 211 to 21n in which the desired color is set based on the selection signal. The write controller 3° transfers the color information selected by the data selection circuits 251-253 to the R, G, B memory planes 401-403.

On the other hand, the coordinate information set in the coordinate register 23 is sent to the write controller 30. The write controller 30 sends an address signal corresponding to this coordinate information to R, G.
, B memory planes 401 to 403. This K determines the writing position on each memory plane.

Through this operation, the R, G, B memory plane 4
0. An image to be displayed is written in 403.

Note that the graphic memory 40 may be other than R, G, and B memory frames.

〔effect〕

According to such a color graphic display device, the following effects can be obtained.

That is, when writing a figure to the graphic memory 40, information on each color to be used is stored in the color registers 211 to 2.
1n, and the color information for the pixel to be written is selected from the color registers 211 to 21r1 and sent to the R, G, and B memory registers 7401 to 4.
05 at the same time. This allows graphics to be displayed in a desired color without being aware of color information. From this, color information can be written efficiently. In addition, color registers 211 to 21n
A mode in which the selection depends on coordinate information can also be provided, so even when drawing a figure with a different color for each coordinate, it is possible to draw it without being conscious of color information.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a color graphic display device according to the present invention, and FIG. 2 is a block diagram of the main parts of FIG. H, 21, ~ 213... Color register, 22...
Color selection register, 23...Coordinate register, 24.
...Selection signal generation circuit, 25. 25. ~25. ...
Data selection circuit, 3゜...Write controller, 4
0,401-403...Graphic memory, 60.
··display. Chest 1

Claims (1)

[Claims] In a color graphic display device that writes an image to be displayed in a graphic memory, reads the image from the graphic memory, and displays the image using a plurality of colors on a display device, information on colors used for writing the graphic is set. a color selection register in which color information about the pixel to be written is set at any time; a coordinate register in which coordinate information about the pixel to be written is set at any time; and the color selection register a selection signal generation circuit that generates a selection signal according to the contents of the coordinate register; and a data selection circuit that selects one of the plurality of color registers in which a desired color is set based on the selection signal. and a write controller that transfers information on the color selected by the data selection circuit to the graphic memory.