JPS61279890A - Color crt 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] Industrial Application Field The present invention relates to a color CRT used in an information processing system, etc.
Related to display devices.

Conventional technology :,.

Conventionally, the color 〇)LT display device &t in this building had one refresh buffer to store the color code □'1.

・11 Then, each n point on the 081 screen is refreshed (.

A fixed color code, each designated in the
By □□ de, 7 rets were made.

t'1 1"N&L!',: f61m"J
However, the conventional color CRT display mentioned above
□The device is refreshed every time with a certain color code.
□14°, so red with the same intensity! ,
: Colors obtained by combining green and blue (red, green, blue, :.

Limited to display colors (yellow, cyan, -center, white) 1
It has the disadvantage of being too small.

Himi 8A was created in order to eliminate the above-mentioned drawbacks inherent in the conventional technology.Therefore, the purpose of the present invention is to display only the colors that can be obtained by combining red, green, and back of the same intensity. In addition, it is an object of the present invention to provide a novel color CRT display device capable of displaying intermediate colors obtained by combining the n seven colors obtained by the above combinations.

Means for Solving the Problems In order to achieve the above object, the color CRT display device i according to the present invention includes first and second refresh buffers for storing color codes, and data writing to the refresh buffers. When input data is decoded, if it is an extended color specification code, the data is separated and converted into two basic color specification codes, and if it is not an extended color specification code, the input data is used as it is in the first and second color specification codes. a decoding means for outputting an output to each of the refresh buffers, and a selection means for alternately selecting the first and second refresh buffers for each screen refresh when reading data from the refresh buffer. configured.

Embodiments Next, one preferred embodiment of the present invention will be specifically explained with reference to the drawings.

Figure fs1 is a block configuration diagram showing one embodiment of the present invention.

In FIG. 1, reference number l indicates a decoder, and the decoder IH receives the λ card data 101 from the main system 5, decodes this code, and when it is an extended color specification code, specifies two basic colors. The data is decomposed and converted into codes, and if it is not an extended color designation code, the data is output as is as write data 102 and 103 to the n#I-refresh buffer 2 and the second refresh buffer 3, respectively.

The address selection unit 6 selects either the write address 201 from the main system 5 or the read address 202 from the refresh counter 7 according to the address selection signal 305 from the main system 5, and selects the write address 201 from the main system 5 or the read address 202 from the refresh counter 7 as the write/read address 203. Output to the first and second refresh buffers.

The refresh counter 7 receives and receives the basic timing 301 from the timing generator 18, outputs the retrace time signal 303 to the main system 5, and
: One screen paste refresh ends for selection circuit 4
Refresh buffer selection signal 3 that inverts each time
04, and further outputs a synchronization signal 307 to the monitor control section 9.

The main system 5 receives the retrace time signal 303 from the refresh counter 7 and sends an address selection signal 9 that instructs to select the write address 201 during the retrace time and to select the subsequent address 202 when not during the retrace time. A signal 305 is output to the address selection unit 6, and furthermore, if it is during the retrace time and there is data to be written to the refresh buffer, the λ data 101 is output to the decoder l.
A write mode instruction signal 306 is output to the first and second refresh buffers.

When the write mode instruction signal 306 from the main system 5 is 'ON', the first refresh buffer 2 and the second refresh buffer 3 decoder the write/read address 203 from the address selection section 6 as a write address. The write data 102 and 103 from 1 are written n-t'n, and when the write mode instruction signal 306 is '(JFF'), the write/read address 2 from the address selection unit 6 is written.
Using 03 as the read address, select read data 104 and 105. Output to G4. The i selection circuit 4 selects the first
'-Read data 104 from refresh buffer 2
' Read data from 7-receiver buffer 3
Select either one of 1 or 105 and display the display data.
It is sent to the monitor control unit 9 as o6.
1 monitor control section 9 receives the display data 106 from the selection circuit 4, and receives the data from the timing generation section 8.
According to the synchronization signal 307 of the ears, the color code is decoded,
″: Performs display signal generation, parallel/serial conversion of the display signal, display signal amplification, etc., and monitors the display signal 401.
Output to O.

'11゜As described in detail, according to the present invention, the first and If
and a second set of refresh buffers.
j′1(,1
1.: By setting different color specification codes and refreshing the first and second 7 buffers alternately every time one screen is refreshed, the conventional red, green, blue, yellow, In addition to the display colors of cyan, maze, and white, an effect can also be obtained in which intermediate colors can be displayed by a combination of the seven colors.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

Claims (1)

[Claims] In a color CRT display device used in an information processing system, etc., there are first and second refresh buffers that store color codes, and when data is written to the first and second refresh buffers, input data is decoded and extended colors are displayed. If it is a specified code, the data separated and converted into two basic color specification codes is output, and if it is other than an extended color specification code, the input data is output as is to each of the first and second refresh buffers. A color CRT display device comprising a decoding means and a selection means for alternately selecting the first and second refresh buffers each time one screen is refreshed when reading data from the refresh buffer.