JPS59183A - display device - 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 Object of the Invention The present invention relates to a display device, and more particularly to a display device capable of stably displaying one tone of brightness, etc., in a character display device of a lath-slash scan type.

CRT display sections of conventional character display devices include color CRTs and monochrome (B/W) CRTs, and the video signal frequency for the CR and T display sections, that is, the 1 tod unit time of dot display. , depending on the number of characters displayed per line. Conventionally, when dot separation is not performed on a monochrome CRT, the display line brightness in the raster scan direction becomes too bright compared to the brightness of the display line with a plane angle in the raster scan direction, so the video signal is not divided into dots. By separating them, uniform brightness was obtained.

However, as the number of displayed characters per line increases, the unit time per DR F becomes shorter, and as the video signal frequency increases, the video amplifier in the CRT display section no longer follows the video signal, resulting in a decrease in display brightness. There was a problem with the blade.

On the other hand, when displaying on a color CRT, an effect equivalent to dot separation of the video signal can be obtained using a shadow mask, but conversely, separating the video signal into dots reduces the light emitting efficiency, resulting in dull color tones. There was a problem.

OBJECTS OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to eliminate the above-mentioned mass production of conventional character display devices, and to enable CRT display sections to be either color or monochrome. It is an object of the present invention to provide a display device that can prevent disturbances in brightness, such as one color tone, regardless of the type or the number of displayed characters per line.

It is an object of the present invention to provide a means for specifying the number of characters to be displayed in a type 1 of a CRT display section, and a means for specifying the number of characters to be displayed in a type 1 of a CRT display unit, and a means for specifying the number of characters to be displayed in a type 1 of a CRT display unit, and a means for specifying the number of characters to be displayed in a type 1 of a CRT display unit, in a character display device of a lath-rastray scan type.

This is achieved by a display device comprising a dot-separation clock signal generator for separating dots according to the number of displayed characters, etc., and a circuit for selecting the dot-separation clock signal based on the output of the specifying means. be done.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a display device showing an embodiment of the present invention, in which 1 is a character pattern generator, 2 is a shift register, δ is a dot separation designation switch, a character hood is input, J: and raster scan Toei. , generates a character pattern. The shift register 2 outputs the character pattern as serial data at the rising edge of the clock signal (CLOCK) and sends out a dot pattern signal to the computer games 10, 11, 12 and 13.

The dot separation designation signals X and Y are CRT] Type 5 (
This is a signal indicating color, monochrome, horizontal frequency, etc., and is designated by the dot separation designation switch 1.degree.3. By the combination of the four decoders and the dot separation signals X and Y, the AND gate 10.11
．． It has a function to select one of 12 and 13.

Note that b indicates an inverter, and 6.7 indicates a transfer element.

The operation of the apparatus of this embodiment configured as described above will be explained below.

In the apparatus of this embodiment, three types of driver 1 separation pulses a, b, and c as shown in FIG. 2 are prepared. Dot separation pulse a is a signal obtained by inverting CI and OCK by inverter b, and dot separation pulses b and C delay CLOCK by delays 6 and 7, respectively, and perform the dot separation by OR gates 8 and 9, respectively. pulse&
It is also a signal that can be added by ORing with .

Dot 3 from shift register 2. Before receiving the pattern signal, the RN AND gate 10, 11, 12 and 13, does not perform dot separation.
11 is the dot molecule lif pulse a
According to nIJ language) cut pattern f<! When j is dot-separated to l:1, the length and the AND gate 12 are the front b.
[) When performing a slightly wider dot separation with the dot separation pulse b, the AND gate 13 performs (
I have 8i power generator.

The decoder 4 generates the dot separation signal X as described above.

Since at least one corresponding to the combination of Y is selected and -C is selected, the output is passed through the dot separation designation switch 3, and the video signal of the type specified by the dot separation designation switch 3 is transmitted to the CII.
T display +; Send to u 15 and display 111.

Building 3 Figure 6 *, [:, *i', 5X by the example device
An example of the display of text size °°) bi° using a 7-dot matrix is shown below. It shows.

In addition, Figure 4 Plane and (to) are respectively Figure 3 (5),
The video signal of the raster 43 in (B) is shown in FIG. In addition, in Figure 4, t indicates the unit time for one dot, and t indicates the time for displaying one dot.

In the actual sleeve example ■ above, there are 3, 1, and 1 dots.

Although a separate clock signal is used, the present invention is not limited thereto.

Effects of the Invention As described above, according to the present invention, in the raster scan type character display device, type 1 of the crt 't' display section
A means for specifying display characters, etc., and a dot separation clock for separating the video signal into dots corresponding to the number of display characters per ηυ code type (by the output of the M generator and the n11 specifying means, the above-mentioned Since the circuit for selecting the dot separation 11J clock signal is general 'GJ, C1 (.

The pulse width to be displayed during one dot unit time can be selected in accordance with the number of type 1 display characters on the T display section, and C)1
This has the remarkable effect of not only being able to prevent the disturbance of the nine brightness tones on the 'I' display screen, but also having the manufacturing advantage of being able to easily meet a wide range of user needs.

[Brief explanation of drawings]

Fig. 1 of the rod is a block diagram of the display setup showing one embodiment of the present invention, Fig. 2 of the whistle is a time chart of the dot separation signal, and Fig. 3 of the rod (
A) and (B) are display examples of the character °°H''', and Fig. 4 is a diagram showing its details. 1: Character pattern generator, 2: Shift register, 3 2-dot separation designation switch , 4: Decoder, 5: Inverter, 6.7: Delay element, 8. Q, 14: Mare gate, 10
~13: AND gate, 15: C4'I' display section. 1ji 11 zo 2 f'l, (lf'l\ No. 314

Claims (1)

[Claims] In a raster scan type character display device, means for specifying the number of characters to be displayed in type 1 of a CRT display section, a clock signal generator for dot separation for separating video signals into dots corresponding to the number of characters to be displayed in type 9, and the above. A display device comprising a circuit for selecting the dot separation clock signal based on the output of the specifying means.