JPS6156389A - Display control system - 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 [Field of Industrial Application] The present invention relates to a display device, and more particularly to a display control method for initially setting display control information in a programmable display control unit and controlling the display.

Traditionally, most of the means of communication between computers and humans have been input using keyboards and output through printing, but as the scope of use of computers expands, more diverse means are required. One such device is a display device that directly visually conveys the output of a computer.

CRT is currently widely used as a display device.
It is a display device (cathode ray tube display device). CRT
are used in television receivers, and with the development of television technology, they have also undergone various developments as display devices for computers.

The display control unit that outputs the synchronization signal H3, VS or refresh signal in the display device is a programmable C
An RT controller is used, and the display is controlled by initializing display control information in the CRT controller by a program. When the device is powered on, the program runs and it takes a very long time to initialize the CRT controller.During that time, the CRT controller does not operate normally and the screen quality is not guaranteed, so it is necessary to initialize the CRT controller in a short time. There is a need to.

[Conventional technology]

Conventionally, a display device includes a processing unit (MPU) 1 that controls the entire device, a CRT unit (display section including a driver circuit 3) 2, and a display control section (CRT controller) that controls the display of the CRT unit 2, as shown in FIG. )
4 and a display memory 5 that stores display data.

In a general CRT unit 2, the display control section itself uses a self-oscillation method, and when the power is turned on, the MPU 1 initializes display control information in the display control section 4.
The driver circuit 3 outputs synchronizing signals H3 and VS, and the driver circuit 3 scans the CRT with a beam to display the contents of the display memory 5.

[Problem that the invention seeks to solve]

If the synchronization signals H3 and VS are not output from the display control unit 4 within a short time after the display device is powered on, the electron beam output from the driver circuit (driving circuit) 3 will irradiate the same position on the CRT screen. However, there are problems in that the phosphor of the CRT 2 may be burned out, and the output transistor of the driver circuit 3 may deteriorate or be destroyed.

In particular, when controlling the device using the MPUI, the MPUI is initialized by turning on the power, the program starts running, and once the program runs normally, the display control unit 4 is initialized. For example, if there are many programs (2), it takes time for the display control section 4 to initialize and output the synchronization signal H3°VS, causing the above-mentioned problem.

Furthermore, if the MPU goes down, there is a possibility that the contents of the display control section 4 will be rewritten, and the screen will naturally be damaged, resulting in the same problem as above.

[Means for solving problems]

The above problem is solved by a fixed storage device that stores display control information and a control means that transfers data in the fixed storage device to the display control section when the power supply section is powered on. The present invention is solved by the display control method according to the eighth aspect of the present invention, characterized in that 606 initializes the display control information of the fixed storage device by the display control unit 2° by the control means.

[Effect]

A fixed storage device (P-ROM) in which display control information is stored separately from the MPU control bus to the display control section of a conventional display device, and a special bus and display control information of the fixed storage device are displayed in the display control section. By providing a control means for transferring information to the control section, display control information is initially set in the display control section at the same time as power is turned on, and as a result, safe display control can be performed at high speed without deteriorating the circuit.

〔Example〕

Hereinafter, the gist of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram explaining one embodiment of the present invention, and FIG.
The figure shows a table of display control information in a fixed storage device. Note that the same reference numerals throughout the figures indicate the same objects.

The display device shown in FIG. 1 includes a processing unit (MPU) 1 that controls the entire device, a CRT unit (display section including a driver circuit 3) 2, and a
In addition to the display control unit (CRT controller) 4 that controls the display of the RT unit 2 and the display memory 5 that stores display data, there is also a fixed storage device (P-1) that stores display control information.
ROM) 6 and means (controller) for setting display control information in the fixed storage device 6 to the display control section 4.

The display control information length of the fixed storage device (P-ROM) 6 is a table showing addresses and initial setting contents as shown in FIG.
The initial setting contents of the fixed storage device 6 are stored and initialized in the register of the display control section 4. As mentioned above, conventional MPU
Fixed notes apart from the control bus '11! Device 6
By providing a bus between the display control section 4 and the display control section 4, and the setting means 7, the display control information of the fixed storage device 6 is set in the register L of the display control section 4.
Initial settings for the display control ear part 4 by the user are not required.

Since the initial setting operation is performed by the power ON signal, the initial setting is performed at the same time as the power is turned on, so it is fast.

Furthermore, since the synchronizing signals H3 and VS are outputted from the display control section 4 to the CRT 2, the DC voltage of the driver circuit 3 is not increased and the output transistor is not deteriorated or destroyed.

Furthermore, since there is no need to initialize the display control unit 4 using the MPUI, the burden on the MPUI is reduced.

〔Effect of the invention〕

As explained above, according to the present invention, by providing a fixed storage device storing display control section information and a means for setting the display control information in the display control section, a display can be initialized quickly and is safe for driver circuits. can be controlled.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a table of display control information in a fixed storage device, and FIG. 3 is a block diagram of a conventional display device. In the figure, ■ is a processing unit (MPU), 2 is a CRT unit, 3 is a drive circuit (driver circuit), 4 is a display control unit (CRT controller), 5 is a display memory, 6 is a fixed storage device (P-ROM) , 7 indicates a setting means (controller). Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A display device including a display section, a processing device, a display control section, a power supply section and a display control section in which display control information is set by the processing device, the fixed storage device storing the display control information, and the power source. control means for transferring the data in the fixed storage device to the display control section when the power supply section is turned on; A display control method characterized by initial setting in a display control unit.