JPH0253797B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a color graphic display device that performs graphic display using a plurality of colors on a display.

[Conventional technology]

In a graphic display device, an image to be displayed is usually written in a graphics memory, and the image is read out from the graphics memory and displayed in multiple colors on the display.

Conventionally, such graphic processing devices include, for example,
Write controller to graphics memory 1
There was one that allowed you to directly access and write images bit by bit. However, in this graphic processing device, when performing color display, for example, R,
When performing color display using G and B memory planes, each time one pixel is written, R, B memory planes are used.
Data corresponding to color information must be sent to each of the G and B memory planes. For this reason, this graphic display device has a problem in that when performing color display, the number of data transfers during writing increases, resulting in poor efficiency.

[Problem that the invention seeks to solve]

The present invention has been made 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 graphics display device that writes an image to be displayed in a graphics memory, reads the image from the graphics memory, and displays it on a display using multiple colors. 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 a color register in which a desired color is set 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 graphics 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, 30 is a write controller, 40 is a graphics memory, 50 is a display controller, and 6
0 is an indicator.

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

The information processing section 20 outputs information on the color and coordinates to be written into the graphics memory 40 based on the signal from the processor 10.

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

The graphic memory 40 stores, for example, R, G, B
memory planes 40 ₁ , 40 ₂ and 40 ₃ .

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, and a plurality of color registers from 21 ₁ to 21 _o are provided. These color registers 21 ₁ to 21 _o include
Color information used for drawing figures is set. Among the information set in these registers ₂₁₁ to _21o , information regarding red is R _COL1 to _{R COLo.}
It is. The same applies to the information G _COL1 to G _COLo and B _COL1 to B _COLo regarding green and blue.

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

Reference numeral 23 denotes a coordinate register, in which information about the X and Y coordinates on the display screen of the display device 60 for the pixel to be written is set at any time.

24 is a selection signal generation circuit which outputs a selection signal according to the contents of the color selection register 22 and the coordinate register 23;

25 is a data selection circuit, and circuits 25 ₁ , 25 ₂ and 25 ₃ corresponding to the R, G, B memory planes 40 ₁ , 40 ₂ and 40 ₃ are provided.
These data selection circuits 25 ₁ to 25 ₃ select one of the color registers 21 ₁ to 21 _o in which the color desired to be displayed is set based on the selection signal.

[Effect]

Next, the operation of such a color graphic display device will be explained.

The processor 10 sets color information used for writing figures into color registers 21 ₁ to 21 _o . 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. Thereby, the data selection circuits 25 ₁ to 25 ₃ select the color registers 21 ₁ to 21 _o based on the selection signal.
Choose the one that has the color you want to write in from among them. The write controller 30 transfers the color information selected by the data selection circuits 25 ₁ to 25 ₃ to the R, G, B memory planes 40 ₁ to 40 ₃ .

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 the R, G, B memory plane 40 ₁
~40 Send to ₃ . This determines the write position on each memory plane.

Through such operations, images to be displayed are written in the R, G, B memory planes 40 ₁ to 40 ₃ .

Note that the graphics memory 40 may be other than the R, G, and B memory brains.

〔effect〕

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

That is, when writing a figure into the graphics memory 40, the information of each color to be used is set in the color registers 21 ₁ to 21 _o , and the color information about the pixels to be written is stored in the color registers 21 ₁ to 21 _o. Selected from R, G, B
They are simultaneously transferred to memory planes 40 ₁ to 40 ₃ . With this, you can
Graphics can be displayed in any desired color. From this, color information can be written efficiently. In addition, color registers 21 ₁ to 2
1 A mode in which the selection of _o depends on coordinate information is also available, 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 diagram of the main part of FIG. 21, 21 ₁ to 21 ₃ ...color register, 22
... Color selection register, 23 ... Coordinate register, 24 ... Selection signal generation circuit, 25, 25 ₁ ~
25 ₃ ... data selection circuit, 30 ... writing controller, 40, 40 ₁ to 40 ₃ ... graphic memory, 60 ... display device.

Claims (1)

[Scope of Claims] 1. In a color graphic display device that writes an image to be displayed in a graphics memory, reads this image from the graphics memory, and displays the image using multiple colors on a display, the color used for writing the graphic is a plurality of color registers in which information 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; a selection signal generation circuit that generates a selection signal according to the contents of a color selection register and a coordinate register; and a selection signal generation circuit that selects a color register in which a desired color is set from among the plurality of color registers based on the selection signal. A color graphic display device comprising: a data selection circuit; and a write controller that transfers information on a color selected by the data selection circuit to the graphics memory.