JPS61267783A - Crt display - 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 the Invention The present invention relates to a CRT having a function of calculating character brightness that satisfies an appropriate brightness ratio of a CRT display screen and setting the character brightness to that value.

Conventional technology Conventionally, CRT display (hereinafter simply referred to as CRT)
In most cases, the character brightness on the screen has been set by the CRT operator himself by appropriately adjusting the character brightness adjustment knob on the CRT. However, it is unclear whether the brightness ratio of the CRT screen based on the character brightness adjusted in this way satisfies an appropriate value, and in order to accurately set the appropriate brightness ratio, It was necessary to measure the character brightness and background brightness of the CRT screen using a brightness meter. If CRT
If CRT work is continued without the brightness ratio of the screen being set to an appropriate value, the CRT operator will become more fatigued and work efficiency will decrease.

Problems to be Solved by the Invention As described above, the setting of character brightness on a conventional CRT screen is largely left to the subjective judgment of the CRT operator.
It was unclear whether the brightness ratio of the CRT screen based on the character brightness adjusted by the T operator satisfied an appropriate value. Furthermore, in order to accurately set an appropriate brightness ratio, it was necessary to measure the character brightness and background brightness of the CRT screen using a brightness meter.

The present invention has been made in view of this point, and provides the CRT itself with a function of calculating the character brightness that satisfies the appropriate brightness ratio of the CRT screen and setting the character brightness to that value.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses a signal output from a measurement unit that measures the vertical illuminance of a CRT screen and an output unit that outputs the diffuse reflection coefficient of the CRT screen. The CRT is equipped with an arithmetic unit that calculates the applicable character brightness of the CRT, a signal generator that generates a signal corresponding to the applicable character brightness, and a control unit that controls the character brightness.

According to the above-described configuration, the present invention calculates the character brightness that satisfies the appropriate cRr screen brightness ratio from the vertical illuminance of the CRT screen and the diffuse reflection coefficient, and sets the character brightness of the CRT screen to that value. I can do it.

Embodiment Figure 1 is a block diagram showing an embodiment of a CRT according to the present invention, which has a function of calculating character brightness that satisfies the appropriate brightness ratio of the CRT screen and setting the character brightness of the CRT screen to that value. In the figure, 1 is a vertical illuminance measurement unit including a light receiving unit embedded in the CRT main body, 2 is a CRT screen diffuse reflection coefficient signal output unit, 3 is an applied character brightness calculation unit, 4 is an applied character brightness signal generation unit, 6 is a character brightness control unit, and 6 is a CRT.

In general, CRTs are installed in positions where the illumination light source does not appear on the CRT screen, or even if the illumination light source is located in a position where the illumination light source is reflected on the CRT screen, the illumination light source or lighting equipment is placed in such a way that it does not actually interfere with the image. It is desirable to use lighting equipment with controlled light distribution.

Therefore, the present invention is applicable when there is no brightness of specular reflection component caused by direct reflection of an illumination light source or lighting equipment on a CRT screen. The CRT of the present invention is installed at any location that satisfies this lighting condition. First, the measuring section 1, which includes a light receiving section embedded in the CRT main body,
The vertical illuminance of the screen is measured. Measuring unit 1 and CRT
The signals respectively output from the screen diffuse reflection coefficient output section 2 are input to the applied character brightness calculation section 3. However, since the diffuse reflection coefficient is a known value specific to each CRT,
The output section 2 always outputs a constant signal corresponding to that value. When no illumination light source or lighting equipment is directly reflected on the CRT screen, that is, when the brightness of the specular reflection component on the CRT screen can be ignored, the brightness ratio C of the CRT screen is C=
1+ LC/EvRd. Here, Lc represents the character brightness of the CRT screen, Ev represents the vertical illuminance, and Rd represents the diffuse reflection coefficient. Therefore, the character brightness Lc on the CRT screen can be calculated as Lc = (CI) EvRd. Here, the Ministry of International Trade and Industry's VDT guidelines recommend a range of 3 to 10 as an appropriate range for the brightness ratio of a CRT screen. Here, assuming that the optimum brightness ratio is 6, the calculation unit 3 calculates the applied character brightness expressed by L c = 4 E v Rd. Furthermore, the character brightness of the CRT screen is set to the applied character brightness value calculated by the calculation unit 3 from the applied character brightness signal generation unit 4 through the character brightness control unit 5.

Effects of the Invention As described above, according to the present invention, CR
If T is installed, it is possible to calculate the character brightness that satisfies the appropriate brightness ratio of the CRT screen at any installation location, and set the character brightness to that value, which is extremely useful in practice. .

BRIEF DESCRIPTION OF THE DRAWINGS The figure shows one embodiment of the invention. 2 is a block diagram showing a CRT having a function of calculating character brightness that satisfies an appropriate brightness ratio of the CRT screen and setting the character brightness of the CRT screen to that value. FIG. 1...Vertical illuminance measuring section, 2...Diffuse reflection coefficient signal output section, 3...Applicable character brightness calculation section, 4...Applicable character brightness Signal generation section, 5...
...Character brightness control unit, 6...CRT

Claims (2)

[Claims] (1) A measurement unit that measures the vertical illuminance of the CRT display screen, an output unit that outputs the diffuse reflection coefficient of the CRT display screen, and a character that is applicable to the CRT display from the signals output from the measurement unit and output unit. A CRT display equipped with a calculation unit that calculates brightness, a signal generation unit that generates a signal corresponding to the applicable character brightness, and a control unit that controls the character brightness. (2) A CRT display according to claim 1, which has a function of calculating character brightness that satisfies an appropriate brightness ratio of a CRT display screen and setting the character brightness to that value.