JPS5854385A - Digitally controlled color picture 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 digitally controlled color image G1 display device that utilizes a combination of the three primary colors of red (R), green (G), and blue (B), and particularly to a color image G1 display device that utilizes a combination of the three primary colors red (R), green (G), and blue (B), and in particular, to 8 colors (including black)
The purpose is to make it possible to easily display intermediate colors between these colors.

Color information and image information are stored as a pair in the lii image memory in advance.
The color image information for i1i planes is stored, and the cough memory is scanned to the color CRT (cathode ray tube) at 60 pixels per second.
~Digital control force that reproduces color still images on 60 screens 2-In image display devices, generally several color information is R, G, B
Since the five primary colors are simply expressed as a combination of 200 million digital values such as 1, 0.0, the types of colors reproduced are R, G,
A composite color that combines each primary color B, any two of R, G, and H, a composite color (white) that combines all of R, G, and B, and a composite color that uses all of R, G, and B. Shirasuri T〉 Add black and total 8
Limited to color. Recently, in addition to the R-GsB O5 primary colors, a method has been developed that provides multi-value amplitude information for each R, G, and B designated signal and performs D/M conversion on the combination to display more than 20 types of multi-colors. However, this is complex and expensive.

The present invention attempts to increase the number of displayed colors with a simple configuration, and its features include scanning an image memory to sequentially output color information and image information expressed in digital codes, and color information using scissors. In a digitally controlled color image display device that reproduces still images on a color cathode ray tube by selectively combining five primary colors of red, green, and blue based on The point is that one of the several color information is stored and the other is used alternately in the odd numbered frames and the even numbered seven frames of the color cathode ray tube. This will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Color image information for one screen is written into an image memory 1 using an address bus 2 and a data bus 3. In FIG. All of this color image information is expressed as a digital code and is a set of nine color information and image information, but in the present invention, as shown in FIG. 2, two color information 1.
Assign 1. The continuous output control circuit 4 sequentially reads the gun output addresses of the image memory 1 by counting the output of the reference oscillator 5 with an address counter, etc., and scans the memory two-dimensionally repeatedly nine times. By scanning the entire area of the memory 1 t-1 times, color image information for one screen (frame) is read out, and this is normally repeated 60 to 60 times per second. Good image information read from the image memory 1 is led to a pattern generator 6, converted from parallel to serial by a P/8 converter 7, and commonly led to each gate of a color synthesis circuit 8. Each gate of this color synthesis circuit 8 is connected to the image memory 1.
The opening/closing is controlled using nine color information R, G, and B. A color CRT 9 is driven by the output of the color synthesis circuit 8.

In the present invention, as shown in FIG. 2, two pieces of color information 1.1 are assigned to one image information, so that these pieces of color information are simultaneously displayed one after another. Selector 10 is color information! .

In this example, the color information 1.1 is alternately selected between even frames and odd frames of an image displayed in CBr4. For this rounding, the vertical synchronization signal (2) of the video synchronization signal generation circuit 11 is used. This vertical synchronization signal V is originally a synchronization signal that causes the CBr4 to return to its original position and start the horizontal scanning of the next frame when the horizontal scan of 11 diIili (7 frames) is completed, so this is used as a synchronization signal for vertical synchronization. If the counter 12 is counting, the contents of the cough counter will change from even to odd and even, each time the count is increased. Then, in response to this, the output color information of the selector 10 is changed every time the frame changes...1'-1-1-
It changes to 1... Incidentally, since the vertical synchronizing signal V is also given to the readout control circuit 4, the scanning of the image memory 1 and the scanning of the CBr4 are synchronized.

In the above configuration, the color information shown in FIG. 2 in advance! .

If you make the Otori different, for example, the color information I can be changed to R@” 0+
G1 = 1 e B1-1 (cyan) is set to 1, and the color information layer is set to R = 0°G* = 1 y Bl = 0 (
green), the color reproduced by CBr4 will be that of the CRT.
And due to the residual effect of the eyes, the color becomes intermediate between cyan and green (light green). Is this effect a CRT? This will be further promoted if a material with strong afterglow is used. There are other examples of neutral colors.

Note that some combinations may not be available. For example, R,G.

B is (1,0,0), (0,1,0), (0,0,1)
In other words, the combination in which one of R, G, and B single colors is used as lust lit and the other as color information l is the color in the case of the conventional method that constantly outputs IIQ, QB, and BR, which are two selected from R, G, and B. It doesn't have to be a special tool. Colors other than the eight colors produced by the conventional method are some of the combinations of single color lines, multiple colors, and multiple colors.

Furthermore, in the present invention, not all of one screen is necessarily displayed in the round neutral colors described above, but there are also portions in the usual eight colors. The same code can be written in the line color information 1.1 regarding this square part.0 stroke 3 is a specific example of FIG. Configure. The counter 4a gives a horizontal readout signal to the image memory 1, and the counter 4bFi also gives a vertical successive signal, so when these are combined by the synchronization signal synthesis circuit 11, CBr
A synchronization signal for 4 is obtained. The vertical readout signal of the counter 4b is also given to the pattern generator 6, whereby bit information of each scanning line is extracted in parallel.
A data latch 5 holds the color information 1.1 extracted from the image memory 1 and supplies it to the selector 10. The V synchronization counter 12 in this example is composed of seven lip-flops, and inverts the output Q every time the vertical synchronization signal V is input.
As a result, the selector 1o switches the lust 41.1 between even and odd frames.

As described above, according to the present invention, the color CR of the three primary colors
Using T, it is possible to display multicolor paper with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram of the main part of a picture image memory, and FIG. 3 is a block diagram showing a specific example of FIG. 1. In the figure, 1-line image memory, 9 is a color cathode ray tube, 10 is a selector, and 12 is an i-direct synchronization counter. Applicant Fujitsu Limited Representative Patent Attorney Minoru Aoyagi

Claims (1)

[Claims] The image memory is scanned to sequentially output color information and image information expressed in digital codes, and based on the color information, the five primary colors of red, green, and back are selectively combined to reproduce a still image on a color cathode ray tube. In a digitally controlled color image display device, one image information and two color information are stored in advance in the image memory, and one color information and the other color information are stored in odd and even frames of a color cathode ray tube. A digitally controlled color image display device characterized by being used alternately.