JPS61279886A - 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 Industrial Application The present invention satisfies the appropriate brightness ratio of a CRT display (hereinafter simply referred to as CRT) screen when there is a reflection of a lighting fixture or light source on the screen. This invention relates to a CRT having a function of calculating character brightness and setting the character brightness to that value.

2. Description of the Related Art Conventionally, character brightness on a CRT screen has mostly been set by a CRT operator by appropriately adjusting a character brightness adjustment knob on the CRT. However, it has been unclear whether the brightness ratio of the CRT screen based on the character brightness adjusted by such a method satisfies an appropriate value. Also, CR
If there is a reflection from a lighting fixture or light source on the T screen,
To accurately set the appropriate brightness ratio, use a brightness meter to
It was necessary to measure the brightness of characters on the RT screen and the brightness of objects reflected on the CRT screen (lighting equipment and light sources).

Problems to be Solved by the Invention As described above, the setting of character brightness on conventional CRT screens is largely left to the subjective judgment of the CRT operator, and
The brightness ratio of the CRT screen based on the character brightness adjusted by the RT operator satisfies an appropriate value.

t-″″″″2″゛Dochi゛31 16°6・11・01
If there is a reflection from a lighting fixture or light source on the screen: To accurately set the appropriate brightness ratio, use a brightness meter to measure the character brightness on the CRT screen and objects reflected on the CRT screen ( It was necessary to measure the brightness of lighting equipment and lighting sources.

The present invention has been made in view of the above points, and it is possible to improve
The CRT itself has the function of calculating the character brightness that satisfies the appropriate brightness ratio of the 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 provides a measurement section that measures the vertical illuminance of the 017 screen, a measurement section that measures the brightness K of an object reflected on the 017 screen, and a measurement section that measures the brightness K of an object reflected on the 017 screen. an output section that outputs the diffuse reflection coefficient and specular reflectance of the CRT; a calculation section that computes the applicable character brightness of the CRT from these output signals; a signal generating section that generates a signal corresponding to the applicable character brightness; This is provided in a control unit that controls brightness and 1cRT.

Function The present invention has the above-mentioned configuration, and the vertical illuminance of the 017 screen, the brightness of lighting equipment and lighting sources reflected on the 017 screen, and the 0
From the diffuse reflection coefficient and specular reflectance of the 17 screen, 017
017 when there is a reflection of a lighting fixture or light source on the screen
The character brightness that satisfies the appropriate brightness ratio of the screen is calculated, and the character brightness of the 017 screen is set to that value.

The example diagram shows a method of calculating the character brightness that satisfies the appropriate brightness ratio of the 017 screen when there is a reflection of a lighting fixture or light source on the 017 screen, and setting the character brightness of the 017 screen to that value. FIG. 2 is a block diagram showing an embodiment of a CRT having the function of In the figure, 1 is the vertical illuminance measurement unit of the 017 screen, which includes a light receiving unit embedded in the CRT body, and 2 is the CR
017 Equipped with a luminance meter built into the main body of the T; a unit that measures the luminance of objects reflected on the screen, such as lighting equipment and illumination light sources;
3 is a diffuse reflection coefficient signal output section for the 017 screen, 4 is a specular reflectance signal output section for the CR plate screen, 6 is an applied character brightness calculation section, 8 is an applied character brightness signal generation section, -7 is a character brightness control section, 8 is a CRT.

In general, a CRT is equipped with an illumination light source that is reflected on the CRT screen.
:.

be installed in a location that does not interfere with lighting, or
Even if the i-source is located at a position where it is reflected on the 017 screen, it is desirable to use a lighting fixture whose light distribution is controlled so that the illumination source or lighting fixture is not actually reflected.

However, in reality, there are many cases in which a CRT-i is used with lighting equipment and light sources reflected on the 017 screen. The present invention is applied to a case where there is brightness of a specular reflection component caused by direct reflection of a lighting source or a lighting fixture on the 017 screen. 017 The CRT of the present invention is installed at a position where the illumination light source or lighting equipment is directly reflected on the screen. First, the vertical illuminance of the 017 screen is measured by the measuring section 1, which includes a light receiving section embedded in the CRT body. Next, the measurement unit 2 equipped with a luminance meter built into the CRT body measures the luminance of the lighting equipment or illumination light source reflected on the 017 screen. Furthermore, the signals outputted from the measurement unit 1, the measurement unit 2, the diffuse reflection coefficient signal output unit 3 of the 017 screen, and the specular reflectance signal output unit 4 of the 017 screen are input to the applied character brightness calculation unit 6. . However, the diffuse reflection coefficient and specular reflectance of the CR screen of the present invention are assumed to be known values, and the output sections 3 and 4 always output constant signals corresponding to these values. CRT picture
If a lighting source or lighting fixture is reflected on the same surface, that is, the brightness of the specular reflection component is present on the 017 screen.
:i, the brightness ratio C of the 017 screen is expressed as follows.
). = I-wax/50
,. ”= (Lc+Ld+Ls)
/(Ld+Ls)
I, :, J= 1 +Lc/(Ld+Ls) =1+1°/(EvRd-1-I, oRs)
,',゛Here, Lc is 017
The character brightness of the screen, Ld is il, the brightness of the diffuse reflection component of No. 017 screen, Ls is CRT
,.

・□、・ The brightness of the specular reflection component of the screen, Ev, is the 017 screen's brightness.
-Pad・,′ Vertical illuminance, R (1 is the diffuse reflection coefficient, LO is OR'r
iii,) The brightness of the lighting equipment and illumination light source reflected on the screen, Rs G): represents the specular reflectance, respectively. therefore,
)017 The character brightness Lc on the screen is Lo, = (C
−1)・□゛1:′.

It can be calculated as ++ (IEvR,! + LoR8). Here, as an appropriate range for the brightness ratio of the CRT i1 screen, v n T l'j, 4 ka 4), 4y □ 3 ka 15. of the Ministry of International Trade and Industry is used. . □Ah. Yu
)...Here, considering the optimum brightness ratio to be 6, the applied character brightness (Lc=4(EvR
d + LoRs). Furthermore, the character brightness of the CRT screen is set to the applied character brightness value calculated by the calculation unit 6 from the applied character brightness signal generation unit 6 through the character brightness control unit 7.

Effects of the Invention As described above, when the CRT of the present invention is installed in a position where the illumination light source or lighting equipment is directly reflected on the CRT screen,
It is possible to calculate the character brightness that satisfies the appropriate brightness ratio of the CRT screen and set the character brightness to that value, which is extremely useful in practice.

[Brief explanation of drawings]

The figure is a block diagram showing the configuration of a CRT display in one embodiment of the present invention.

Claims (1)

[Claims] It has a measuring section that measures the vertical illuminance of a CRT display screen, a measuring section that measures the brightness of an object reflected on the screen, and an output section that outputs the diffuse reflection coefficient and specular reflectance of the screen, and these A CRT display comprising: a calculation unit that calculates an appropriate character brightness for a CRT display from an output signal; a signal generation unit that generates a signal corresponding to the applicable character brightness; and a control unit that controls the character brightness.