JPS59100495A - Color 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 [Technical Field of the Invention] The present invention relates to a color display device that displays characters and characters in all colors using a CRT i.

- [Technical background of the invention and its problems] Conventionally, a full graphic color display device as shown in FIG. 1 is known as a color display device using CRTTh. 1 is the data/β line, 2 is the address line, 3 is the CRTC controller, 4 is the refresh memory address, 5 is the timing signal, 6 is the multiplexer, pattern memory corresponding to 7° 8.9 degrees RB&G+B, IO is the video Controller, ll is color 7
, CRT.

When the display disappears, the address information input to the address line 2 is first applied to the pattern memories 7 to 9 through the multiplexer 6, and then the address information input to the data line I is applied to all the data memories 7 to 9. and then refresh memory address 4 via multiplexer 6 to memories 7 to 9i/i:
The contents of the memories 7 to 9 are read out, processed by the video controller 10 based on the timing signal 5, and then transferred to the CRTll.
send to : However, in such a full graphic color display device, for example, 640 dots (horizontal) x 2
In order to display the resolution of 0”0 dot (vertical),
Overall 1640 x 200 x for pattern memories 7 to 9
48 bytes out of 3 bits (1 byte = 8 bits requires a large memory capacity, high □my, ::2227,7
11,290, such characters: 11 Nido Memory 2J,! E'character' lid pattern memory 22 and all attribute memories for color signals are added to a black and white character display device to provide a color display function. However, in this configuration, There is a problem in that the color can only be specified on a character by character basis, and when trying to display graphic colors, the pixels become rough.

・□ - 10,000, There is also a method □ in which the pattern memories 7 to 9 in Figure 1 are used as one and the color specification code memo 'v is shared with the character code memory, but the color specification can be made in character units and colors! If you select □, you will need to change the character code to a color specification code, and the number of characters that can be displayed will be reduced by one.Although it is possible to display graphics, the color cannot be specified (
However, it has the disadvantage that it is possible to specify a color if the pixels are activated.

The object of this invention is to provide full graphics with less memory capacity and without sacrificing resolution.
The object of the present invention is to provide a color display device w capable of performing all types of display.

[Summary of the invention]

The present invention is characterized in that character pattern memories for displaying each color of R, G, and H are provided corresponding to one character code memory. That is, if a character code is given to the character code memory and the character pattern memory, then 1. Is it the same character from each character pattern memory? A character pattern corresponding to each color component of the character (, character, figure) is read out.

Full graph 1. on CRT i4 screen. It is displayed in color.

[Efficacy of invention]

With this invention, as long as the types of characters that can be displayed do not significantly increase, full graph ink color display can be performed with less memory capacity while maintaining the same resolution as a conventional full graph ink color display device. It becomes possible to do so.

Furthermore, since the display position on the CRT screen can be designated character by character, there is an advantage that the display pattern can be moved at full speed.

[Embodiments of the invention]

FIG. 3 shows wx of a color display device according to an embodiment of the present invention. 31 is a data line, 32 is an address line, and p1 is connected to a microcomputer, etc. (not shown). 33 is a CRTC controller, refresh memory address 34 and horizontal.

Timing signals such as vertical synchronization signals and blanking signals 3
5 times occur. 36 is a multiplexer which is turned off and provides the address information on the address line 32 and the refresh memory address 34 from the HCRTC controller 33 to the character code memory 37.

The character code memory 37 stores characters corresponding to a plurality of characters and figures (characters) input from the data line 31 at an address specified by address information given through the address line 32 and the multiplexer 36. The code is stored in advance, and in the display mode, the contents are read out when the refresh memory address 34 output from the CRTC controller 33 is applied through the multiplexer 36. Numeral 39 is a multiplexer which supplies the character code 38 from the character code scent 37 or the address information on the address line 32 to the character pattern memory 40, 41, 42.

Character pattern memory 40, 41, 42 is the same.
'LR (red), GC'41, and B (blue) are provided corresponding to the data line s7. ..1: f) Patterns of R, G, and 13 color components of each incoming character are stored in advance. In the display mode, the character pattern memory tJ0.41.42 is filled with character code memory 37.
The character code 38 read out from the character code 38 is inputted as address information through the multi-blephr 39, so that the character code 38 corresponding to the R, G, and B color components of the character to be displayed from the character pattern memories 40, 41, and 42 is inputted as address information. Character patterns 43, 44, and 45 are output.

And these character patterns 43°44.45
-1) Character patterns 43, 4 are applied to the S video controller 46 based on the timing signal 35 from the HCRTC controller 33 by the n1 hiteo controller 46.
4.45 is processed and supplied to the color CRT 47. As a result, the desired character pattern is displayed on the screen of the CRT 47 in the form of a full graphic color display. -t', that is, character patterns 43, 44 and 45
For example, it is composed of units corresponding to dots on the screen of a CRT 47, and these are combined as a meaningful graphic pattern on the screen and displayed in color.

According to the above configuration, if a full graphic color display device of, for example, 640 x 200 dots is to be realized, the size of one character pattern is... ! : As 8x8 dots, the character code memory 37 is 8. ．． It is sufficient if there is a capacity of 0x25=2 bytes. On the other hand, if there are 256 types of characters that can be displayed at once on the screen, there are 4 character code memories.
0.41 and 42 are each 256 x 8-2 bytes, total 2K
The capacity of x3=6 bytes is sufficient. Therefore, the total memory capacity N
This means that 8 bytes are enough. This is much smaller than the memory capacity of 48 bytes in a conventional full graphic color display device (Fig. 1), which has a pattern memo IJ that supports dots for each R, G, and B, and greatly contributes to cost reduction. be.

[Brief explanation of drawings]

The first diagram is a block diagram of a conventional full graphic color display device. FIG. 2 is a block diagram of a conventional monochrome character display device, and FIG. 3 is a block diagram of a color display device according to one embodiment of the present invention. 31...Data line, 32...Address line, 33...
・CRTC controller, 34... Refresh memory address, 35... Timing signal, 36... Multiplexer, 37... Character code memory, 3
8... Character code, 39... Multiplexer, 40.41.42... Character pattern memory,
4B, 44.45...Character pattern, 46...
・Video controller, 47...CRT 0 Applicant's agent Patent attorney Takehiko Suzue ■Patent JBa Mitomi
Kazuo Wakasugi 1. Indication of the case Patent application Sho JS'7-209640 No. 2, name of the invention Color Diff, play device 3, person making the amendment Relationship to the case Patent applicant (30 swords Tokyo Shibaura Electric Co., Ltd. 4, agent 6, amendment '5A Full text of the specification 7, amendment to document n D (no change in a) 789-

Claims (1)

[Claims] Color CRT'! In a device that displays characters and figures in color using r, there is a character card memory that stores multiple character codes corresponding to the characters and figures, and a character pattern 'e R, G, B that corresponds to the character code in this memory. A color display device characterized by being completely equipped with a character pattern memory stored for each color.