JPS6048080A - Image display system - 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 an image display system, and more particularly to an image display system for displaying characters or figures in color on a cathode ray tube.

Conventionally, on a cathode ray tube (hereinafter referred to as CRT) screen, there are M lines x N lines.
When displaying multiple characters or figures of a digit and controlling the color of the characters or figures, the data memory that stores the code signals of the characters and figures to be displayed is used in addition to the code signals of each character and figure. Color information code (generally 1 (, G, H) indicating what color the printed character is
Bit) text: and graphic code signals were stored independently. Therefore, the data memory that stores character and graphic code signals has a storage capacity of color information code signals (3 bits of 几, G, and H) XMXN for color display. required in minutes. This has the disadvantage that when a device for displaying characters and graphics on a CRT is made into a small one-chip IC, the chip size increases, lowering the yield, increasing material costs, and increasing the cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display method that eliminates the above-mentioned drawbacks, reduces color information within a range that does not cause any practical inconvenience, and is advantageous for one-chip IC implementation.

The image display method of the present invention includes a data memory that stores code signals of M rows by N digits of characters or figures to be displayed on a cathode ray tube, and a character or figure according to the code signals of characters or figures generated from the data memory. a character generator that outputs pattern information of figures; a shift register that inputs the output of the character generator and outputs pattern information in series; a color information code signal memory that stores color signals for each row; and a nucleus row color information code. a data selector that selects a colored information code signal output from the signal memory using a row selection signal; a color control gate that inputs the outputs from the shift register and the data selector to control the color; and a color control gate that controls the color of the output from the color control gate. a cathode ray tube for inputting and displaying colored character and graphic output signals;
The device includes a timing generation circuit that controls the data memory, character generator, shift register, and data selector in synchronization with a vertical synchronization signal and a horizontal synchronization signal.

Next, embodiments of the present invention will be described using the drawings.

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

This embodiment includes a display character/figure code signal data memory 1 for storing code signals of M rows x N digits of characters or figures to be displayed on a cathode ray tube, and a character/figure code generated from this data memory 1. A right character generator 8 that outputs character or graphic pattern information 18 according to a signal 17, a shift register 3 that inputs the pattern information 18 and outputs pattern information 20 in series, and a colored information code signal that stores color signals for each row. a memory 2, a data selector 7 which selects the colored 1r1 information code signal 9 outputted from the colored information code signal memory 2 by a row selection signal, and a color control which inputs the outputs from the shift register 3 and the data selector 7 to control the color. A gate 4, a cathode ray tube 5 for displaying a character/figure output signal 11 colored manually by the output from the color control gate 4, a data memory 1, a character generator 8, a 77, a register 3, and a data selector 7 are arranged vertically. It is configured to include a timing generation circuit 6 that performs control in synchronization with a synchronization signal 15 and a horizontal synchronization signal 16.

More specifically, the timing generation circuit 6 counts the horizontal synchronization signal 16 reset by the vertical synchronization signal 15 and outputs the row selection signal 13. An oscillation circuit 19 oscillates a serial shift clock 12 synchronized with the horizontal synchronization signal 16. The serial shift clock 12 is counted by a timing generation circuit 6 to generate a digit selection signal 14. The digit selection signal 14 is reset by the horizontal synchronization signal 16. Display character 9
The graphic code signal data memory 1 generates a character 9 graphic code signal 17 corresponding to the 9 digits of the selected row by the digit selection signal 14 and the row selection signal 13, and inputs it to the character generator 8 to form a character graphic code signal 17. A signal 18 is generated.The shift register 3 reads the character/figure pattern signal 18, and outputs pattern information 20 which is a character/figure signal based on the serial shift clock signal 12.The color information code signal memory 2 outputs the light color corresponding to each row. An information signal 9 is output, and a row selection signal 13 is output by the data selector 7.
According to the color information code signal lO of the digit currently displayed
is output. The pattern signal 20, which is the output of the shift register 3, is input to the C-T5 and displayed as a character/figure output signal 11 in which either 几, G, or H is selected and colored by the color information code 10 by the color control gate. .

As explained above, according to the present invention, by providing a color information code signal (3 bits of R, G, and H) for each row, colors can be switched to any combination of R, G, and H for each row. To miniaturize a character display device capable of displaying a variety of colors and significantly reducing data storage capacity compared to attaching a color information hood to each character as in the past. Furthermore, an image display method suitable for one-chip IC can be obtained.

Incidentally, in order to simply display the time, channel, title, etc. on one side of the TV screen, changing the color for each line is sufficient.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1...Display character graphic code signal data memo 1c 2...New color information code signal memo 1c 3p...
・Shift register, 4...Color control gate, 5.
...CRT16°゛°°°゛Timing generation circuit, 7...Rata selector, 8...Character generator, 9. Old ゛°1 color information code signal, 1o. ...Color information =! - code signal, 11...
...Character 2 figure output signal, 12...Serial output shift clock signal, 13...Row selection signal, 14...
... Digit selection signal, 15 ... Vertical synchronization signal, 16 ... Horizontal synchronization signal, 17 ... Character 1 figure code signal, 18 ... ...Character 1 figure pattern signal, 19...Oscillation circuit, 20°°°゛°° pattern suspicious alarm.

Claims (1)

[Scope of Claims] A data memory for storing a code signal of M rows by N digits of characters or figures to be displayed on a cathode ray tube. a character generator that outputs character or graphic pattern information according to a character or graphic code signal generated from the data memory; a shift register that inputs the output of the character generator and serially outputs pattern information; and a color signal for each row. a new color information code signal memory for storing a new color information code signal memory; a data selector for selecting a colored information code signal output from the new color information code signal memory by a row selection signal; and the shift register. and a color control gate that inputs the output from the data selector to control the color; a cathode ray tube that inputs the output from the color control gate and displays a C-colored character/figure output signal; and a data memory and a character controller. An image display method comprising: a timing generation circuit that controls a generator, a shift register, and a data selector in synchronization with a vertical synchronization signal and a horizontal synchronization signal.