JPS61270979A - Luminance adjusting circuit for crt for monitoring - Google Patents

Abstract

PURPOSE:To automatically make optimum luminance according to a brightness of a monitoring environment by detecting a change of the brightness of a place in which a CRT monitor is set and setting a target value of an optimum luminance corresponding thereto. CONSTITUTION:A signal representing a brightness of an environment in which a CRT display 6 detected by an optical sensor 1 is placed is made nemerical and thereafter transmitted to a control section 4 through a signal input section 3 disposed in a monitoring device main body. The control section 4 obtains an optimum luminance of the CRT display 6 by an operation from said signal value and the numerically set value is transmitted to a luminance changing section 5. The luminance changing section 5 controls a luminance circuit of the CRT display 6 so as to obtain the corresponding luminance based on the set value fed from the control section 4 and changes the luminance on a fluorescent surface to make optimum the luminance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a brightness adjustment circuit for a CRT monitor, which adjusts the brightness of a CRT display and spray according to ambient brightness.

[Background technology]

In a conventional display CRT for a monitoring device, the brightness was adjusted by a person operating a brightness adjustment knob provided on the main body of the monitoring device. However, the above-mentioned conventional technology has the following drawbacks because the brightness of the CRT display is manually adjusted by a person. Even if the brightness around the CRT display changes, unless a person adjusts the brightness, the brightness of the CRT display will not be optimized for the environment. In this case, an observer looking at a CRT display with inappropriate brightness would
Experiencing more eye fatigue than necessary and having negative effects on eye health. In addition, among the inappropriate brightness caused by the above reasons, using a CRT display with higher brightness than necessary will unnecessarily accelerate the deterioration of the electron gun and phosphor screen of the CRT display, and shorten the life of the CRT display. In addition to reducing the power consumption, it also causes unnecessary power consumption, which is undesirable in terms of effective use of resources and energy conservation. [Object of the Invention] The present invention has been made in order to eliminate the above-mentioned drawbacks.
An object of the present invention is to provide a brightness adjustment circuit for a CRT for a monitor, which has a function of automatically optimizing brightness according to the brightness of a monitoring environment.

[Disclosure of the invention]

In order to achieve the above object, the present invention has the following configuration. That is, the CR for seven niters according to the present invention
The brightness adjustment circuit of T is for CRT display (℃ monitor).
6) In response to the signal generated by the optical sensor +11 installed to detect changes in brightness at the location where the CRT display (6) is installed, the optimum brightness target value of the CRT display (6) for seven-day monitors is determined. It consists of a control section (4) for setting, and a brightness changing section (6) for realizing the optimum brightness according to the surrounding brightness according to the setting value of the control section (4).

The present invention will be described in detail below with reference to the accompanying drawings.

[Embodiment 1] FIG. 1 is a block diagram specifically showing Embodiment 1 of the present invention. The signal indicating the brightness of the environment in which the CRT display (6) is placed, detected by the optical processor fi+ shown in FIG. The signal is transmitted to the control unit (4) through the signal input unit (3). The control unit (4) calculates the optimum brightness of the CRT display (6) from the signal value and transmits the numerical setting value to the brightness changing unit (6). Brightness changing section [5)! /i, has the function of controlling the brightness circuit of the CRT display (6) so that the brightness corresponding to the setting value sent from the control unit (4) is obtained;
6) Optimize the brightness by changing the brightness of the phosphor screen.

Figure 2 shows the brightness changing unit (5) and CRT described in the above embodiment.
2 shows a detailed block diagram of the interface of the display (6); FIG. To explain this block diagram below, the brightness control signal generated in the brightness changing section (5) has its amplitude adjusted by an attenuator (B), and then a DC signal component is removed by a bypass filter (C). This is the output signal of the brightness changing section (5) and is transmitted to the brightness circuit (D) K attached to the CRT display (6).
It changes the brightness.

[Example 2] - FIG. 3 shows Example 2. In this embodiment, a plurality of CRT displays (6) are installed in one room. That is, each CRT display (
6) A dedicated controller part (7) is provided to calculate the optimal brightness of each CRT display (6) and transmit a control signal to the corresponding brightness change unit (6). It is possible to configure a system that automatically adjusts the brightness of the CRT display (6) to an optimum value.

In each embodiment, the signal level of the optical sensor (1) when the lighting at the location where the monitoring device (A) is installed is
It is set as a threshold value for cutting off the power to the display (6), and has a function that automatically turns off the power to the CRT display (6) when the supervisor turns off the lights when going out. Good too.

〔Effect of the invention〕

Since the present invention is constructed as described above, the brightness adjustment can be performed automatically without having to do it manually, so that the observer always sees the adjusted CRT phosphor screen at the optimum brightness. , it is possible to minimize eye fatigue, which is good for eye health, and because CRT displays do not have to be used at higher brightness than necessary, CRT
Since deterioration of the electron gun and phosphor screen of the display is not unnecessarily accelerated, and unnecessary power is not consumed, resources can be used effectively and energy saving techniques are also useful.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a block diagram showing an embodiment of the interface between a brightness changing unit and a CRT display, and FIG. 3 is a block diagram showing a second embodiment of the present invention. In the figure, (1) is the optical sensor, (4
) is a control unit, (5) is a brightness change unit, and (6) is a CRT display. Agent Patent Attorney Ishi 1) Awe 7 Figure 1 Figure 2 ■ Figure 3

Claims (1)

[Claims] (1) A control unit that sets a target value for the optimum brightness of the monitor CRT display in response to a signal generated by a light sensor provided to detect changes in brightness in the place where the monitor CRT display is installed. A brightness adjustment circuit for a monitor CRT, comprising: a brightness changing section for realizing an optimum brightness according to surrounding brightness according to a setting value of the control section.