JP2909080B2 - Display control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention provides, for example, a personal computer, a personal workstation, or the like, which is equipped with, for example, a plasma display unit as a standard and can be connected to a CRT display unit as desired. And a display control device suitable for use in the computer system.

(Prior art) Conventionally, a plasma display unit is standard equipment,
In a computer system such as a personal computer or a personal workstation, to which a CRT display unit can be arbitrarily connected, a multi-tone palette (hereinafter referred to as a CRT palette) for specifying a multi-level (for example, 64 levels) of the CRT display unit ) And a gradation palette (hereinafter referred to as a PDP palette) for specifying the gradation (4 to 16 gradations) of the plasma display unit, and the palette values are individually set.

(Problems to be Solved by the Invention) However, in the method in which the CRT pallet and the PDP pallet are separated from each other, it is difficult for the pallet change to be reflected on the plasma display in an application program for dynamically rewriting the pallet. There was a problem.

The present invention has been made in view of the above circumstances, and when a CPU (software) rewrites pallet data to a CRT pallet, hardware automatically converts a value (PDP pallet data) corresponding to the data into a pallet for a plasma display. Provided is a display control device in which multi-gradation display (for example, 64 gradations) of a CRT display is always reflected on gradation display (for example, 16 gradations) of a plasma display as a configuration for writing to a (PDP palette). The purpose is to:

[Constitution of the Invention] (Means and Actions for Solving the Problems) The present invention relates to a personal computer having a gradation display function of a plasma display of m gradation display and a CRT display of n gradation display more than the plasma display. A first gradation palette provided for a display drive of the CRT display; a second gradation palette provided for a display drive of the plasma display;
Means for generating m gradation data from the pallet data of the first palette with rewriting of the pallet data of the first gradation palette; and converting the m gradation data generated by the means into the second floor. It has a means to write to the tone palette, and the tone palette of the CRT display and the tone palette of the plasma display are linked,
As a result, the multi-gradation display of the CRT display is always reflected on the gradation display of the plasma display, and even when the palette is dynamically rewritten, information due to the difference in gradation on the CRT display is always displayed on the plasma display. Can be recognized.

(Embodiment) 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 of FIG. 2, and FIG. 2 is a block diagram showing the configuration of the entire system including the high resolution display system 30 shown in FIG. It is.

In FIG. 2, reference numeral 11 denotes a CP that controls the entire system.
U and 12 are 32-bit CPU buses (D31-24, D23-16, D15-
8, D7-0) and 13 are latch circuits (B-LAT), and 14 is a 32-bit memory bus (MD31-24, MD23-16, MD15-8, MD7-
0) and 15 are latch circuits (C-LAT), 16 is a 16-bit and 7-bit address bus (SA19-0, LA23-17) and 16
A system bus consisting of a data bus (SD15-8, SD7-0) 16a of bit width, and 17 and 18 are internal RAM (DRAM), 1
9 is cache memory (SRAM), 20 is internal ROM (BIOS-RO
M).

21 is a timing controller (TC) that controls the timing of the entire system including memory control, and 22 is a bus controller (BUS-CN) that controls the system bus.
T) and 23 are cache memory controllers (CMC).

30 is a display control function that drives a CRT display with high resolution (720 dots in the horizontal direction) and multiple gradations (64 gradations), and a display drive that simultaneously displays a CRT display and a plasma display. This is a high-resolution display system (HRGS) having a display control function of (dots), the details of which are shown in FIG.

In FIG. 1, 31 to 34 are components of a high resolution display system, respectively, and 31 is a CRT display (CRT) 50 having a high resolution (720 dots) as described above,
This is a CRT display controller (CRT-CNT) that drives and displays with multiple gradations (64 gradations). 32 via the system bus 16
A bus interface function for exchanging data of various display control systems with the CPU 11 and a plasma display (PD
P) A display control unit (DC) having a gate array structure in which various functional circuit units that control the display control of 40 are mounted. Here, as the palette data (64 gradations) of the CRT palette 341 is rewritten, Gradation data corresponding to data (16 gradations)
, A PDP palette 322 on which the gradation data generated by the conversion table 321 is set, and the like. Reference numeral 33 denotes a display data memory (hereinafter, referred to as VRAM) for storing display data, which is composed of 64K × 4 bits. Reference numeral 34 denotes a CRT display data generation unit which generates analog multi-gradation (64-gradation) display data under the control of the CRT display controller 31. Here, a CRT palette 341 and a digital
It has an analog conversion circuit and the like. Reference numeral 61 denotes a 16-bit data bus (SD15-0) for transferring various data including rewrite pallet data between the system bus 16 and the display control unit 32.
0) and 62 store the pallet data in the CRT display data generator 34.
Data bus (SD7-
0).

FIG. 3 shows the CRT display data generator 34 in the above embodiment.
6 is a diagram for explaining the relationship between the gradation (64 gradations) of the CRT palette 341 in FIG. 7 and the gradation (16 gradations) of the PDP palette 322 in the display control unit 32.

Here, the operation of the embodiment will be described with reference to FIGS. 1 to 3.

In FIG. 1, the display data read from the VRAM 33 by the read access of the CRT display controller 31 is a CRT display.
It is sent to the CRT display data generator 34 and the display controller 32 via the display controller 31 and the internal bus (VD7-0). The CRT display data generator 34 converts the input display data into gradations (64 gradations) using the CRT palette 341 and then converts the display data into analog display data to convert the display data into a CRT display 50.
To display a multi-tone (64-tone) image on the CRT screen in accordance with the tone designation of the CRT palette 341. The display control unit 32 converts the display data input via the internal bus (VD7-0) into gradations (16 gradations) using the PDP palette 322.
After that, it is sent to the plasma display 40 and displayed on the PDP screen in 16 gradations according to the gradation designation of the PDP palette 322.

Here, when rewriting the CRT pallet 341 in the CRT display data generating unit 34 under the control of the CPU 11, the rewriting data (CRT pallet data) includes the system bus 16, the data bus (SD15-00) 61, and the data bus. (SD7-0) CRT via 62
The data is input to the display data generator 34 and written into the CRT pallet 341 in the CRT display data generator 34, and is transmitted from the data bus (SD15-00) 61 via the conversion table 321 in the display controller 32. Written to PDP pallet 322, PDP pallet 341
The pallet 322 is rewritten.

At this time, the CRT palette 341 in the CRT display data generation unit 34
FIG. 3 shows the relationship between the gray scale (64 gray scales) and the gray scale (16 gray scales) of the PDP palette 322 in the display control unit 32. In this case, the color data (R,
3 shows a case where G (Green) data of G, B) is used as monochrome data. The conversion table 321 can be rewritten under the control of the CPU 11.

As described above, the configuration in which the PDP palette 322 is rewritten in accordance with the rewriting of the CRT palette 341 always reflects the multi-gradation (64 gradation) display of the CRT display on the plasma display gradation (16 gradation) display. Thus, even when the pallet is dynamically rewritten, information on the difference in gradation of the CRT display 50 can always be recognized on the plasma display.

In the above embodiment, the gradation of the CRT display is set to 6
Although 4 gradations and 16 gradations of the plasma display are used, the present invention can be applied to many gradation relations.
In the above embodiment, the plasma display is the display control target, but the present invention can be applied to other flat panel displays.

[Effects of the Invention] As described above in detail, according to the display control device of the present invention,
In a personal computer having a gradation display function of a plasma display for displaying m gradations and a CRT display for displaying n gradations more than the plasma display, the first gradation provided to the display drive of the CRT display A palette, a second gradation palette provided for the display drive of the plasma display, and m gradation data from the palette data of the first palette with rewriting of the palette data of the first gradation palette. Means for generating, and means for writing the m gradation data generated by the means to the second gradation palette, wherein the gradation palette of the CRT display and the gradation palette of the plasma display are linked. With the configuration, CR
The multi-gradation display of the T display is reflected on the gradation display of the plasma display, and even when the palette is dynamically rewritten, information due to the difference in gradation on the CRT display can always be recognized on the plasma display.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the entire system in the above embodiment, and FIG. 3 is a CRT display data generation unit 3 in the above embodiment.
4 CRT palette 341 gradation (64 gradation) and display control unit 32
10 is a diagram for explaining the relationship with the gradation (16 gradations) of the PDP palette 322 in FIG. 11: CPU, 12: CPU bus (D31-24, D23-16, D15-8, D
7-0), 13 ... Latch circuit (B-LAT), 14 ... Memory bus (MD31-24, MD23-16, MD15-8, MD7-0), 15 ...
Latch circuit (C-LAT), 16 System bus (SA19-
0, LA23-17, SD15-8, SD7-0), 17, 18 ... Internal RAM (D
RAM), 19: Cache memory (SRAM), 20: Internal R
OM (BIOS-ROM), 21 Timing controller (T
C), 22: Bus controller (BUS-CNT), 23: Cache memory controller (CMC), 30: High resolution display system (HRGS), 31: CRT display controller (C
RT-CNT (PVGA)), 32 Display control unit (DC (HRGS-G
A)), 33 VRAM (display data memory), 34 CRT display data generator (DAC), 40 plasma display (PDP), 50 CRT display (CRT), 61, 62 data Bus, 321, conversion table, 322, PD
P pallet, 341 ... CRT pallet.

Claims (2)

(57) [Claims] A personal computer for driving a flat panel display and a CRT display having a higher gradation display function than the flat panel display, comprising: a gradation palette provided for a display drive of the CRT display; Means for rewriting pallet data of the same gradation palette, and means for generating gradation data of the flat panel display from the pallet data in accordance with data rewriting of the gradation palette, and a display drive of the CRT display. A display control device, wherein the gradation of the CRT display and the gradation of the plasma display are linked when rewriting the palette data of the gradation palette provided in (1). 2. A personal computer having a gradation display function of a plasma display for displaying m gradations and a CRT display for displaying n gradations more than the plasma display, which is provided to a display drive of the CRT display. A first gradation palette, a second gradation palette provided for a display drive of the plasma display,
Means for generating m gradation data from the pallet data of the first palette with rewriting of the pallet data of the first gradation palette; and converting the m gradation data generated by the means into the second floor. Means for writing to the tone palette, when rewriting the palette data of the first tone palette provided to the display drive of the CRT display, the first tone palette to be provided to the display drive of the CRT display is rewritten. A display control device for rewriting pallet data of the second gradation palette in conjunction with a second gradation palette provided for a display drive of a plasma display.