JPH0453993A - Controller for display color - Google Patents

Abstract

PURPOSE:To simply execute the processing in a real time by changing the output of a shift register to new display color data containing no-display and outputting it to a display device, based on a command from each designating means. CONSTITUTION:By a processing color designating means 3, at least one color in colors which are being displayed at present is designated as a color to be processed, and whether the color to be processed is erased or changed to other color is designated in advance by an erasure/change designating means 4. In such a state, in the case of changing the color to be processed to other color, transmission to a display device of processed color dot data is stopped by a video synthesizing means 10, and also, dot data of a color designated by a new display color designating means 5 for designating a new display color is outputted from the video synthesizing means 10. On the other hand, in the case erasure is designated, transmission to the display device of the processed color dot data is stopped by the video synthesizing means 10, and also, transmission of color data outputted from the new display color designating means 5 is also stopped and the color to be processed is erased. In such a way, the processing in a real time can be executed without using two sets of bit map memories.

Description

[Detailed Description of the Invention] [Summary] Regarding a display color control device in a display device that can display data in multiple colors, a display device that does not require the use of two sets of bitmap memories and can process in real time. A display device capable of displaying data in multiple colors by converting parallel image dot data obtained from a bitmap memory into serial dot data using a shift register. , a processing color specification means for specifying a processing color, an erasure/change specification section for specifying deletion or modification of the processing color, a new display color specification means for specifying a new display color after the change, and each of the above. The present invention is configured to include a video synthesizing means for changing the output of the shift register into new display color data including non-display based on a command from the specifying means and outputting the data to the display device.

[Industrial application field]

The present invention relates to a display color control device, and more particularly to a display color control device for a display device capable of displaying data in a plurality of colors.

[Conventional technology]

When displaying documents and graphs created on a computer, or drawings created with CAD, etc., the display contents are divided into items or areas, and each item or area is displayed in a different color. , can be displayed in a way that emphasizes each feature.

FIG. 4 is a block diagram of a display color control device in a display device capable of displaying multiple colors in this manner.

The displayed dot data is red (R), blue (B),
7' Lean (G) bitmap memory 1a (IR
a, IBa, IGa), and the dot data read out as parallel data from the bit map memory 1a is converted into serial data by a shift register 2 and input to the display device. When changing the displayed color, read out the dot data in the bitmap memory 1a by operating the CPU 20, change the color, and then transfer it to the separately prepared bitmap memory Ib (IRb, IBb, IGb) of the IMi. The parallel data is changed to serial data by shift register 2 (2R, 2G, 2B) and output to the display device. At this time, the original dot data is saved in the bitmap memory 1a. and can be displayed at any time via the switching circuit 60.

[Problem to be solved by the invention]

According to the above configuration, it is necessary to provide two bitmap memories, the bitmap memory 1b for storing the dot data after color change and the bitmap memory 1a for storing the original color image data. This has disadvantages in terms of price and the disadvantage that it takes time for the CPU to change the color.

This invention has been proposed in view of the above-mentioned conventional circumstances, and provides a color control device for display colors in a display device that does not require the use of two sets of focus map memories (and can perform real-time processing). The purpose is to

[Means to solve the problem]

This invention employs the following means to achieve the above object. That is, as shown in FIG. 1, in a display device that can display data in multiple colors by converting parallel image dot data obtained from a bitmap memory 1 into serial dot data using a shift register 2, Processed color specifying means 3 for specifying a processing color; deletion/change specification means 4 for specifying deletion or modification of the processed color;
A new display color specifying means 5 for specifying a new display color after the change, and based on commands from each of the above specifying means, the output of the shift register is changed to new display color data including no display, and the data is output to the display device. It consists of a video synthesizing means 10 that performs the following steps.

[For production]

At least one color among the currently displayed colors is designated as a color to be processed by the color-to-be-processed designation means 3, and whether the color to be processed is to be erased or changed to another color is specified to be erased/changed. Specify by means 4.

When changing the processed color to another color, the video composition means 10 stops the transmission of the processed color dot data to the display device, and the new display color specifying means 5 specifies the new display color. Dot data of the specified color is output from the video composition means 10. If deletion is specified, the video composition means 10 stops transmitting the color dot data to be processed to the display device, and also stops transmitting the color data output from the new display color specifying means 5. Processing colors are erased.

〔Example〕

FIG. 2 is a block diagram showing an embodiment of the present invention, and FIGS. 3A and 3B are more detailed block diagrams of the video synthesizing means 10 shown in FIG.

Parallel dot data output from bitmap memory 1 (IRlIB, IG) for displaying red (R), green (G), and blue (B) is transferred to shift register 2 (2R
12B, 2G) and serial dot data R,,G, ,
B, and output one dot at a time according to the display clock, and is inputted to a display device via a video synthesizing means 10, which will be described later, and is displayed.

According to the present invention, the color of the dot data input to the display device can be changed or erased in real time.

That is, first, a register 30 is provided whose registered contents can be rewritten by the CPU 20, and color data Rz, Bz - Gz regarding the color to be processed (color to be processed) is input to this register 30 by an operation board (not shown). It is now possible to register (for example,
If red is the color to be processed, R2 is "1', and Bz and Gz are "0.
”).

Further, in a register 40 whose registered contents can be rewritten by the CPU 20, C/E data regarding whether to erase or change the color to be processed can be registered (for example, to erase or change the color to be processed). If you want to change it, it will be "0", if you want to change it, it will be "l"), and if you want to change the processed color registered in the register 30 to a different color, a new display corresponding to the new color after the change. Color data R1, B3, G are specified from the operation board and stored in register 5.
It is registered as 0 (for example, when it is desired to change the color to be processed to blue, Rx and Gx are "0" and B3 is "1").

The color data R2, G, .
0 is input to the comparator 11 (IIRllllG, 11B), where it is compared dot by dot in synchronization with the serial dot data R, G, Bl output from the shift register 2 in synchronization with the display clock CL. , when there is a matching color, the output S of the NOR gate lla in the comparator 11 becomes "0", which causes the AND gate 12R of the next stage to
112G and 12B are turned off. Here register 40
C/ that specifies whether to “delete” or “change” registered in
When the E data is "1" indicating "change", the C/E data and the output S of the comparator 11 are connected to the inverter 1.
AND gates 13R, 13G, and 13B controlled by the signal inverted by 5 are turned ON, and the new display color data R3 and B registered in the register 50 are displayed.
3.G! or gate 14R114G, 14
It is input to the display device via B.

On the other hand, when the C/E data indicating whether to "erase" or "change" is "0" indicating "erase", the AND gates 13R, 113G and 13B are turned OFF.
Even if the color data specified as the new display color is in register 5
Even if it is registered as 0, the color data will not pass through the AND gates 13R, 113G and 13B.Of course, at this time, any color is registered in the register 30 as the color to be processed, so the output signal of the comparator 11 S becomes "0", AND gates 12R1120 and 128 are also turned off, and as a result, the dot data input to the display device is cut off, and the part of the color to be processed registered in the register 30 is left blank. will be displayed.

Note that when the color to be processed is not specified, register 3
Any of the color data R, , G, , B output from 0 becomes "0", the output of the comparator 11 becomes "1", and the AND gates 12R, 12G, 12B are turned ON, and the bit Image data R, , G, , B from map memory 1
, are input as they are to the display device via the AND gates 12R, 12G, 12B1, and the OR gates 14R, 114G, 14B.

With the above configuration, it is possible to easily change the color on the display screen (including no display), such as changing a white display part to another color or erasing only a specific color part.

The processing color designation means 3 shown in FIG. 1 is composed of a CPU 20 and a register 30 in FIG. 2, and the erasure/change designation means 4 is composed of a CPU 20 and a register 40 in FIG. In FIG. 2, the color specifying means 5 is a CPU.
20 and a register 50.

Further, in the above embodiment, only one color can be deleted or changed, but by providing a plurality of these circuits in parallel, it is possible to change and erase as many colors as the number of circuits.

〔Effect of the invention〕

As explained above, the present invention eliminates the need to use two sets of focus map memories when changing a specified color in display data on a display device to another color or erasing it, and has a cost advantage. It also has the advantage of being able to perform changes or deletions in real time.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a more detailed block diagram of the video synthesizing means, and FIG. 4 is a block diagram of a conventional example. In the figure, 1... Bit map memory, 2... Shift register, 3... Processing color designation means, 4... Erase/change designation means, 5... New display color designation means, O. ... Video synthesis means, 1 (IIRlIIG, IIB) ... Comparator, 2 (12
R112G, 12B)...And gate, 3 (13
R, 13G, 13B)...and gate, RI, GI
, B1...dot data, R2, G2, B2...
・Color data, R3, G3, B,...New display color data.

Claims (2)

[Claims] (1) In a display device that can display data in multiple colors by converting parallel image dot data obtained from the bitmap memory (1) into serial dot data using a shift register (2), the color to be processed is a color specifying means (3) for specifying a color to be processed, a means for specifying deletion/change (4) for specifying deletion or modification of a color to be processed, and a new display color specifying means (5) for specifying a new display color after the change. , video composition means (10) for changing the output of the shift register (2) to new display color data including non-display based on commands from each of the designation means and outputting the data to the display device. Characteristic display color control device. (2) The video synthesizing means (10) generates dot data (R_1), (G_1) from the shift register (2).
, (B_1) and the color data (R_2), (G_2), (B_2) set in the processed color specifying means (3), and the output of the comparator (11). The dot data (R_
1), (G_1), and (B_1) to the display device.
N, OFF controlled AND gate (12R), (12G
), (12B), the inverted signal of the output of the comparator (11), and the output of the erasure/change specifying means (4), the new display color data (R_
3), (G_3), and (B_3) to the display device.
N, OFF controlled AND gate (13R), (13G
), (13B). The display color control device according to claim 1.