JPH0277089A - Display controller - Google Patents

Abstract

PURPOSE:To display information by a difference in display color on a plasma display with gradations by providing a means which generates gradation data of a monochromatic display from color pallet data at the time of data rewriting. CONSTITUTION:When the CRT pallet 341 in a CRT display data generation part 34 is rewritten under the control of a CPU 11, the rewritten data (CRT pallet data) is inputted to the CRT display data generation part 34 through a system bus 16, a data bus (SD15-00) 61, and a data bus (SD7-0) 62 and written in the CRT pallet 341 in the CRT display data generation part 34. Further, it is passed through a data bus (SD15-00) 61 and written in the PDP pallet 322 through the arithmetic circuit 320 and conversion table 321 in a display control part 32 to rewrite the PDP pallet 322 according to (associatively with) the rewriting of the CRT pallet 341. Consequently, the information by the difference in display color can be displayed on the plasma display with gradations at all times.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to a personal computer or a personal workstation that is equipped with, for example, a plasma display unit as standard equipment and can optionally be connected to a CRT color display unit. This invention relates to a display control device suitable for use in computer systems such as the above.

(Conventional technology) Conventionally, a plasma display unit was equipped as standard, and C
In computer systems such as personal computers and personal workstations to which an RT color display unit can be arbitrarily connected, there is a color palette (hereinafter referred to as CRT palette) for specifying the display colors of the CRT color display unit; Gradation palettes (hereinafter referred to as FDP palettes) for specifying the gradation of a plasma display unit are separated from each other, and palette values are set individually for each.

(Problem to be solved by the invention) However, the above-mentioned CRT pallet and FDP
In the method in which the palettes are separated from each other, there are problems such as changes in the palette not being reflected on the plasma display in an application program that dynamically rewrites the palette.

The present invention was made in view of the above circumstances, and when the CPU (software) rewrites palette data on the CRT palette, the hardware automatically writes values corresponding to the data to the plasma display palette (FDP palette). It is an object of the present invention to provide a display control device having a writing configuration in which the display color of a CRT display is always reflected in the gradation display of a plasma display.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a personal computer system in which a plasma display and a color display are display drives. A palette (CRT palette) and a gradation palette (PD
P palette), means for generating gradation data from the palette data of the color palette by rewriting the palette data of the color palette, and means for writing the gradation data generated by the means into the gradation palette. It has a configuration in which the color palette and the gradation palette are linked, so that the displayed color of the CRT display is always reflected in the gradation display of the plasma display,
Even when the palette is dynamically rewritten, information based on differences in display colors can always be displayed in gradations on the plasma display.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a high resolution display system 30 in the system shown in FIG. 2, and FIG. 2 is a block diagram showing the configuration of the entire system including the high resolution display system 3o shown in FIG. 1. It is.

In Figure 2, 11 is a CP that controls the entire system.
U, 12 are 32-bit wide CPU buses (D31-24.
023-18. D15-8, D7-0),
13 is a latch circuit (B-LAT), and 14 is a 32-bit wide memory bus (MD31-24. MD23-16.
MD15-8.

MD7-0), 15 is a latch circuit (C-LAT), 16
is a 16-bit wide and a 7-bit wide address bus (SA1
9-0, LA23-17) and a 16-bit wide data bus (SD15-8, SD7-0) Lea, 17 and 18 are internal RA respectively.
M (DRAM), 19 is cache memory (SRAM)
), 20 is an internal ROM (BIOS-ROM).

21 is a timing controller (TC) that controls the timing of the entire system including memory control; 22
is the bus controller (BUS) that controls the system bus.
-CNT), 23 is a cache memory controller (
CMC).

30 is a CRT display with high resolution (horizontal direction 720
A display control function that drives the display in multiple colors (up to 256 colors from 256K (-282144) colors);
This is a high-resolution display system (HRGS) that has a display control function that simultaneously drives a CRT display and a plasma display (in this case, each display has 640 dots in the horizontal direction), and its details are shown in FIG.

In FIG. 1, 31 to 34 are components of a high resolution display system, and 31 is a CRT display (CRT) 50 with a high resolution (7
This is a CRT display controller (CRT-CNT) that drives a display in multiple colors (up to 256 colors).

32 has a gate array structure in which a bus interface function for exchanging data of various display control systems with the CPULI via the system bus 1G and various functional circuits for controlling the display of the plasma display (FDP) 40 are mounted. It is a display control unit (DC), and here it is a CRT.
As the palette data of the palette 341 is rewritten, a calculation circuit (CU) 320 and a conversion table 3211 are used to generate gradation data corresponding to the data, and an FDP is set with the gradation data generated by the conversion table 321 A pallet 322 and the like are provided.

33 is a display data memory (hereinafter referred to as VR) that stores display data.
(referred to as AM), and here it is composed of 64K x 4 bits. 34 is a CRT display data generation unit that generates analog CRT display data (R, G, B) under the control of the CRT display controller 31;
It has a T-pallet 341, a digital-to-analog conversion circuit, etc. 6) is a 16-bit data bus (SD15-00) that transfers various data including rewritten palette data between the system bus 16 and the display control unit 32.
, 62 is a data bus (SD 7-0 ) for writing the palette data to the RT palette 341 in the display data generation section 4 of the CRTR 7.

FIGS. 3 and 4 are diagrams for explaining means for generating FDP palette data from rewritten color palette data in the above embodiment, respectively.

Here, the operation of one embodiment will be explained with reference to the above-mentioned FIGS. 1 to 4.

In the above FIG.
DT-0) to the CRT display data generation section 34 and display control section 32.

The CRT display data generation unit 34 converts the input display data into color specification using the CRT palette 341, and then converts the input display data into R.
, G, H and sent to the CRT display 50, and a color image according to the color specification of the CRT palette 341 is displayed on the CRT screen. In addition, the display control unit 32 converts the display data input via the internal bus (VD?-0) to gradation using the FDP palette 322, and then sends it to the plasma display 40.
The gradation is displayed on the P screen in accordance with the gradation specification of the FDP palette 322.

Here, when rewriting the RT palette 341 in the CRTR7 display data generation section 4 under the control of the CPU II, the rewritten data (CRT palette data) is transferred to the system bus 16, data bus (5DI5-00), 61° data bus ( It is input to the CRT display data generation section 34 via the SD7-0) 62, written to the CRT palette 341 in the CRT display data generation section 34, and displayed via the data bus (SD15-Go) 61. The CR
FDP (in conjunction with) the rewriting of T Palette 341
The palette 322 is rewritten.

The calculation formula of the above arithmetic circuit 320 at this time is shown below,
The relationship between the gradation parameters obtained by the same calculation and the gradation data obtained by converting the parameters using the conversion table 321 is shown in FIGS. 3 and 4. Furthermore, the third
The figure shows the relationship between the default 16-color CRT palette 341 and FDP gradation in color display, and FIG. 4 shows the relationship between gradation parameters and FDP gradation. Furthermore, the conversion data in the conversion table 321 can be rewritten under the control of the CPU II.

* Calculation formula of the arithmetic circuit 320 ■ Gradation intensity - (3X I?cd data) + (6X G
reen data) + (1 x old UE data) ■Tone parameter gradation intensity ÷ 16 (rounded down to the nearest decimal point) In this way, due to the rewriting of the CRT palette 341, 1)
By configuring the PDP palette 322 to be rewritten, the display colors on the CRT display are always reflected in the gradation display on the plasma display, and even when the palette is dynamically rewritten, information based on differences in display colors is always available. Gradation can be displayed on a plasma display.

[Effects of the Invention] As detailed above, according to the display control device of the present invention, in a personal computer system whose display drive targets are a plasma display and a color display, The color palette (CRT palette) and the gradation palette (F
DP palette), means for generating gradation data from the palette data of the color palette upon rewriting the palette data of the color palette, and means for writing the gradation data generated by the means into the gradation palette. By having a configuration in which the color palette and gradation palette are linked, the display colors of the CRT display are always reflected in the gradation display of the plasma display, even when the palette is dynamically rewritten. Information based on different display colors can always be displayed in gradations on the plasma display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing the overall system configuration in the above embodiment, and FIGS. 3 and 4 are respectively in the above embodiment. FIG. 6 is a diagram for explaining means for generating FDP palette data from rewritten color palette data. 11...CPU112...CPU bus (D31-2
4゜D23-IO, D15-8, D7-0')
, 13... latch circuit (B-LAT), 14...
Memory bus (MD3L-24°HD23-IG, MD
L5-8, MD7-0), 15...Latch circuit (C-LAT), 1B...System bus (SA
19-0. LA23-17.5D15-8, SD7-0)
, 17. 18... Internal RAM (DRAM),
19... Cache memory (SRAM), 20...
Internal ROM (BiO2-ROM), 21... Timing controller (TC), 22... Bus controller (BUS-CNT), 23... Cache memory controller (CMC), 30... High resolution display system ( HRGS), 31...CRT display controller (CRT-CNT(PVG'A)), 32...
・Display control unit (DC (HRGS-GA)), 33・
...VRAM (display data memory), 34...CR
T display data generation unit (DAC), 40... plasma display (FDP), 50... CRT display (CRT), 61.02... data bus, 320...
...Arithmetic circuit (CU), 321...Conversion table, 322...FDP palette, 341...C
RT palette. Figure 4 1. Display of the case Patent Application No. 63-229020 2, Invention name display control device 3, Person making the amendment Relationship with the case Patent applicant (307) Toshiba Corporation 4, Agent Chiyoda-ku, Tokyo 3-7-2 Kasumigaseki 100 Phone: 03 (502) 3181 (Main representative) 6. Subject of amendment 8. Contents of amendment (1) and scope of claims are corrected as shown in the attached sheet. (2) In the 13th line of page 10 of the specification, insert the following sentence after the sentence ``Gradation display is possible at the top.'' In the above embodiments, the display control target is a plasma display, but the present invention can also be applied to other flat panel displays. 2. Claim (2) is a personal computer system whose display drive targets are a plasma display and a color display, comprising a color palette provided to the display drive of the color display and a display drive of the plasma display. A gradation palette provided, means for generating gradation data from the palette data of the color palette as the palette data of the color palette is rewritten, and writing the gradation data generated by the means into the gradation palette. 1. A display control device characterized in that the display control device has means for interlocking a color palette and a gradation palette. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A personal computer system whose display drive targets are a plasma display and a color display, comprising a color palette provided to the display drive of the color display, a gradation palette provided to the display drive of the plasma display, and the color means for generating gradation data from the palette data of the color palette as the palette data of the palette is rewritten;
A display control device characterized in that the color palette and the gradation palette are linked, comprising means for writing the gradation data generated by the means into the gradation palette.