JPH04140826A - Crt controller - Google Patents

Abstract

PURPOSE:To reduce the luminance of a CRT screen to half in the case an operation is not executed for a prescribed time by providing a means for detecting a data input interval from an input part. CONSTITUTION:When data is inputted from an input device 1, and an input data signal (a) is sent out to a control part 3, the control part 3 sends out a signal to a timer 4 and resets the timer 4, and also, sets the time determined in advance. In this case, in the case the next data is not inputted to the device 1 even if a prescribed time elapses, the control par0t 3 cannot reset the timer 4, therefore, the timer 4 sends out a timer interrupting signal (b) to the control part 3. As a result, the control part 3 makes a CRT luminance signal (c) to a CRT display part 2 inactive, and reduces the luminance of a CRT screen of the CRT display part 2 to half. That is, by using the timer, the luminance of the CRT screen can be reduced to half in the case the operation is not execut ed for a prescribed time.

Description

[Detailed description of the invention] Scope of claims [Industrial application field] The present invention relates to prevention of burn-in on CRT screens.

[Conventional technology]

Conventionally, in order to prevent burn-in on a CRT screen, the display of the CRT screen was stopped when the screen display was not necessary.

[Problem to be solved by the invention]

The conventional CRT control device described above is designed to stop displaying the CRT screen if it takes a long time to perform the next operation after the device using the CRT is used. If this is not done, there is a disadvantage that the previous operating state of the device cannot be known.

[Means to solve the problem]

The present invention provides a CRT control device having an input section for inputting data and a CRT display section for displaying the data, and includes means for detecting data input intervals from the input section.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the CRT control device of the present invention includes an input device 1 for inputting data, a CRT display section 2 for displaying this data, and a timer 4 for detecting data input intervals from an input section W1.
and a control section 3 that controls these.

Figure 2 is a timing chart showing the operating principle of the present invention)
8 In FIG. 2, first, data is input from the input device 1 and an input data signal a is sent to the control unit 3, and the control unit 3 sends a signal to the timer 4 to reset the timer 4. At the same time, set a predetermined time. At this time, if the next data is not input to the input device 1 even after a predetermined time has elapsed, the control unit 3 will not reset the timer 4, so the timer 4 will send a timer interrupt number 78 to the control unit 3. Due to this, the control unit 3 displays the CF (T display unit 2
The CRT luminance signal C for CR is made inactive, and CR
The brightness of the CR1 screen of the T display section 2 is decreased by #.

In this state, data is input to the input device and the control unit 3
When input data signal a is sent to
The CRT of the CRT display section 2 with the m degree signal C active.
Return the screen brightness to its original state and display the input data.

〔Effect of the invention〕

As explained above, the present invention uses a timer, so that if no operation is performed for a fixed period of time, the CRT
This has the effect of halving the screen brightness.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart showing the operating principle of the present invention. DESCRIPTION OF SYMBOLS 1... Input device, 2... CRT display unit, 3... Control unit, 4... Timer, a... Input data signal, b... Timer interrupt signal, C... CRTII degree signal.

Claims (1)

[Claims] An input section for inputting data, and a C for displaying the data.
A CRT control device having a RT display section, further comprising means for detecting a data input interval from the input section, and halving the brightness of the display surface of the CRT display section if the data is not input within a preset time. A CRT control device characterized in that it displays images by displaying images.