JPS585786A - Color display - 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 The present invention relates to a color display device that can easily display basic colors on a color display.

FIG. 1 is a block diagram showing a conventional color display device. In the figure, 1 is a character code memory section 1a that stores character/symbol codes such as characters or symbols to be displayed.
It is a screen memory consisting of a color code memory section 1b that stores a color code for coloring this character or symbol, etc. The contents of this color code memory section 1b are R (red), as shown in FIG. It is separated into three primary colors, G (green) and B (blue) and stored, and the combination of these three primary colors produces eight colors. 2 is an i4 turn generator consisting of a Noreen memory 2a and a video generator 2b; 3 is a color control circuit having AND circuits 3a to 3c; 4 is a color display such as a color round tube; and 5 is a synchronization circuit.

Next, the operation of the above configuration will be briefly explained. First, address specification from the synchronization circuit 5 is performed on screen memory 1.
The data code and color code are sequentially read out. This data code is then supplied to a pattern generator 2 to extract video data. Accordingly, the color control circuit 3 outputs desired red (R), green (G), and blue (B) color video signals to the display 4 based on the input of the video data and color code. Therefore, characters, symbols, etc. can be displayed on the color display 4 in a desired color.

However, in conventional color display devices, when the power is turned on or when the display screen is rewritten, the character code memory section 1a and color code memory section 1b of the screen memory 1 are cleared, and then new character codes and color codes are written. Each is written to the screen memory 1. At this time, if no color is specified, the contents of the color code memory section 1b will be all 0, and as shown in FIG. The display surface will be black (that is, no text will be displayed). Therefore, the basic color of the color display device is determined to be green, and in order to display the display surface in the basic color, it is necessary to specify '010'' in the color hood section 1b, which has the drawback of requiring an extra specification operation. was there.

The present invention is intended to eliminate the above-mentioned drawbacks, and allows the specification of color codes to be omitted when displaying basic colors on a color display.The present invention will be described in detail below using examples.

FIG. 3 is a block diagram showing an embodiment of a color display device according to the present invention. 6 is a color code conversion circuit that converts the color code.

Next, a color display operation with the above configuration will be explained. First, a data code and a color code are sequentially read out from the screen memory 1 according to address designation from the synchronization circuit 5. This data code is then supplied to a pattern generator 2 to extract video data. On the other hand, the color code is converted by the color code conversion means 6. For example, if the color code is "011", it is converted to "001" by the color code conversion means 6, and as shown in FIG.
It can be changed to a code that displays . Therefore, characters, symbols, etc. can be displayed on the color display on the back.

Next, when the device is powered on or when the display screen is rewritten, the screen memory 1 is cleared. At this time, if the color code is not specified, the cashier code will be ``000'', but the color code conversion means 6 will change it to 9, @010''.
is converted to Therefore, as shown in FIG. 2, the display surface becomes green.

In the above embodiment, a case has been described in which the basic color is set to green when clearing the screen memory 1, but it goes without saying that the same operation can be performed even when other colors are set.

As explained above in detail, according to the color display device according to the present invention, no matter which color is set as the basic color, the designation of the color code can be omitted when displaying in the basic color. There is.

[Brief explanation of drawings]

Figure 1 is a block diagram showing a conventional color display device; Figure 2 is a block diagram showing a conventional color display device;
This figure is a diagram showing the relationship between the color code in FIG. 1 and display colors, and FIG. 3 is a block diagram showing an embodiment of the color display device according to the present invention. 1...Screen memory! a...Character code °Memory part,! b...Color code memory section, 2. Mother turn generator, 2a... Pattern memory, 2b... Video generation section, 3... Color control circuit, 3a to 3c... AND circuit, 4 ... Color display, 5 ... Synchronous circuit, 6
...Color code conversion circuit.

Claims (1)

[Claims] A screen memory consisting of a character code memory section that stores character/symbol codes such as characters or symbols to be displayed, and a color code memory section that stores color codes for coloring these characters or symbols, and from this screen memory. A color display device comprising a pattern generator that converts sequentially read character/symbol codes into pattern data, a color control circuit that modifies a video signal obtained from the turn generator with a color code, and a color display. A color display device characterized in that, when a color code for determining the display color of the color display device is not specified, the color code conversion means converts the color code into an arbitrary basic color color code for display.