JPH025091A - Display controller - Google Patents

Abstract

PURPOSE:To generate a drawing indication in common between a color drawing and a monochromatic drawing by setting information showing white or black corresponding to each color when a look-up table for a color display device is set by a program. CONSTITUTION:A judging means 3 judges which of a color display device 1 and a monochromatic display device 2 is connected and controls switches 7 and 8. A look-up table setting means 4 sets values of R, G, and B in the look-up table 12 when the color display device 1 is connected and stores black/white values in a monochromatic color storage means 6 corresponding to color index values when the monochromatic display device 2 is connected. Consequently, the drawing indication which is sent by the program to the display controller is made common between the color and monochromatic drawings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and more particularly to a control method for color and monochrome display devices.

Prior Art Conventionally, this type of display device has been configured independently for color and monochrome. For example, when displaying 256 colors, a color display device has a color frame buffer of 8 planes, and each plane has at least the capacity of a color monitor of pin 1 to map. FIG. 2 shows the configuration of a color frame buffer in the case of a color monitor that simultaneously displays 256 colors with 1280 pixels horizontally and 1024 pixels vertically. Color frame buffer is #0
~ #7 has 8 planes, each plane has 2048 bits horizontally (1280 bits are used) and 1024 bits vertically.
Consists of Pitsu l~.

FIG. 4 shows a lookup table for a color display device, in which 256 arbitrary colors are set from a 16 million color monitor l-. The lookup table in Figure 4 consists of 256 entries, indexed by color index values from 0 to 255, with each entry representing R (red), G (green), and B (blue).
The brightness of 8 pixels is given by 1~.

This color index value is the value of a combination of all corresponding 8 bits (8 planes) of each pixel in the color frame buffer of FIG.

The color display device performs digital/analog signal conversion based on the color frame buffer and lookup table described below, and displays it on a color monitor.

Next, to explain the conventional technology of a monochrome display device, it has a monochrome frame buffer consisting of one plane as shown in FIG. Displays white/black on a 1% 1024 pixel monochrome monitor. The monochrome frame buffer in FIG. 3 has the same configuration as each plane in FIG. 2.

The color display device and the monochrome display device described above have different frame buffer configurations; in the color display device, a color index value of 8 pixel or more is written to the color frame buffer per pixel, while in the monochrome display device, a color index value of 8 pixel or more is written to the color frame buffer. 1 pixel black (“'
0”) or white (“1'”).

The above-mentioned conventional display devices have the disadvantage that the display colors for color and monochrome display differ from each other, so programs that use the display device must be developed separately for color display and monochrome display. .

OBJECTS OF THE INVENTION An object of the present invention is to provide a display control device in which drawing instructions issued from a program to the display control device can be shared between color and monochrome drawings.

Structure of the Invention According to the present invention, there is provided a determining means for determining whether one of a color monitor display device that performs color display and a monochrome monitor display device is connected according to a color index value specifying each of a plurality of colors; Display determining means for determining black or white in advance in accordance with a previous color index value, and displaying in color according to the color index value when the determining means determines that a color monitor display device is connected. and control means for controlling to perform a black and white monochrome display corresponding to the color index value determined by the display determining means when it is determined that a monochrome monitor display device is connected. A display control device is obtained.

Example Next, the present invention will be explained with reference to the drawings.

FIG. 1 does not show a display control device according to an embodiment of the present invention.
Fig. 72. The display control device shown in FIG. 1 includes a color display device 1 or a monochrome display device 2, and includes a determining means 3, a lookup table setting means 4, a drawing means 5,
It consists of a monochrome color storage means 6 and a switch 7.8.

The color display device 1 includes a color frame buffer 11,
Lookup table 12 and color converter 3
The monochrome display device 2 includes a monochrome frame buffer 21 , a monochrome converter 23 , and a monochrome monitor 24 .

Next, the operation of the display control device of the present invention will be explained with reference to FIG. First, a color display device 1 which is a known technology
The monochrome display device 2 will be explained. The color display device 1 has a bitmap of 1280 pixels horizontally and 151024 pixels, and has a color monitor 4 that can display 256 colors simultaneously. A color frame buffer 11 is provided for displaying on the color monitor 4, and the color frame buffer 11 has the configuration shown in FIG. 2, which has already been described. Moreover, this color display device 1 has 1
It has a look-up table 12 for selecting 256 colors to be simultaneously displayed from a color palette 1 to 6 million colors (24-bit different colors), and has the configuration shown in FIG. 4, which has not been described previously.

Color converter 3 is color frame buffer 1
The value of each pixel in 1, that is, the color index value, is used as an index in the lookup table 2, and the brightness of R (red), G (green), and B (blue) set at the edge of the corresponding encoder 1 is used to convert digital to analog. The signal is converted and displayed on the color monitor 14.

The monochrome display device 2 has the same display size as the color display device 1;
have. In order to display on this monochrome monitor 24, it has a monochrome frame buffer 21, and has the configuration shown in FIG. 3 already described. The monochrome converter 23 is the monochrome frame buffer 21
If the value of each pixel is '0'', it is black, and if it is '1, it is white.The digital/analog signal is converted and displayed on the monochrome monitor 2.
Display on 4.

Next, main parts of an embodiment of the present invention will be explained using such a color display device 1 and a monochrome display device 2. The determining means 13 determines whether the color display device 1 or the monochrome display device 2 is connected, and controls the switches 7 and 8.

The lookup table setting means 4 receives color information as shown in FIG. 5 from a common program for color and monochrome. The color information in FIG. 5 includes R (red), G (green), B (
It includes the white ("1'") and black ("O") values when the monochrome display device 2 is connected.
The example in FIG. 5 shows that bright red, green, brown, blue, magenta, cyan, and white colors are displayed in white, and other colors are displayed in black.

The lookup table setting means 4 is a color display device 1
If both are connected, set the values of RG and B shown in FIG. 5 in the lookup table 12 having the configuration shown in FIG.
If monochrome display device 2 is connected, white/
The black value is stored in the monochrome color storage means 6 in correspondence with the color index value.

When the drawing means 5 is connected to the color display device 1, it writes the drawing input information as it is as a color index value to the color frame buffer 11, and when the monochrome display device 2 is connected, it writes the drawing input information as it is to the color frame buffer 11 using the color index value. The contents of the color storage means 6 are °'0'" or "
The value is determined as 1'' and written to the monochrome frame buffer 21.

That is, as shown in FIG. 5, the lookup table has 256 entries of R, G, and B corresponding to color index values.
In addition to the brightness information, white and black brightness information can also be predetermined and set by a program corresponding to the color index value, so that the same information can be displayed regardless of whether it is a monochrome display device or a color display device. This means that the lookup table can be indexed using the index value of .

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when setting up a lookup table for a color display device from a program,
By setting information on whether white is black in correspondence with each color, there is an effect that the drawing instructions issued from the program to the display control device can be made common for color and monochrome.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a display control device of the present invention, FIG. 2 is a configuration diagram of a color frame buffer of a color display device,
Figure 3 is a configuration diagram of a monochrome frame buffer of a monochrome display device, Figure 4 is a diagram showing an example configuration of a lookup table used in a color display device, and Figure 5 is a lookup table used in a color and monochrome display control device. FIG. 3 is a diagram illustrating a configuration example of up-table setting values. Explanation of symbols of main parts 1...Color display device 2...Monochrome display device

Claims (1)

[Claims] (1) Judgment means for determining whether one of the color monitor display device and the monochrome monitor display device that performs color display according to color index values that specify each of multiple colors is connected, and corresponds to the previous color index value. display determining means for determining black or white in advance; and when it is determined by the determining means that a color monitor display device is connected, controlling to perform color display according to the color index value, and displaying a monochrome monitor display. A display control device comprising: control means for controlling to perform black and white monochrome display corresponding to the color index value determined by the display determination means when it is determined that the device is connected.