JPH046589A - Crt display device - 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 [Object of the Invention] (Field of Industrial Application) The present invention relates to a CRT display device used in various computers such as office computers and word processors.

(Conventional technology) In recent years, computing equipment such as office computers and word processors has been introduced as part of office automation (OA). It has become indispensable. CRTs are commonly used in OA equipment to display data, but as OA equipment becomes more widespread, operators often complain of fatigue (especially eye strain) from staring at CRTs for long periods of time, and as a result, office OA equipment has become increasingly popular. This is one of the problems.

The causes of fatigue are that the CRT's display becomes whitish and unclear due to the reflection of external light, that the background and face are visible in the image, that CRTs emit ultraviolet rays that can easily cause eye fatigue, and that high-intensity visible light can damage the eyes. There may be irritation, flicker may occur due to flicker phenomenon, etc.

As shown in the block diagram of FIG. 5, the conventional CRT display device 11 receives display input signals from various devices through a signal input section 1.
The display signal combination unit 2 combines the display input signal from the signal input unit 1 with the brightness/color signal from the brightness/color signal generation unit 3, and the display signal output unit 4 generates the display signal. Perform processing to output to CR'r:El,
The display signal is displayed on the CRT5 as a screen. In some cases, a filter 6 is added to the screen of the CRT 5 to prevent fatigue. , lI4 section 9 is an input device for changing the brightness of the screen of the CRT 5 according to operator input.

As a measure to prevent fatigue when using a CRT5, improvements to the heart of the device include the filter 6 shown in Figure 5 and coating on the CRT screen display area to prevent reflection of external light, reduce ultraviolet rays, reduce flicker, and improve visibility with high brightness. Light rays are being reduced. A CRT display device is also used in which the background of the CR1 display screen is white and the characters are displayed in black, thereby significantly reducing high-intensity visible light. Most CRT display devices are equipped with an adjustment unit 9 for adjusting the brightness of the display screen, and the brightness can be adjusted to the operator's preference by the operator. Frequent adjustment is effective in preventing fatigue.

Regarding usage, restrictions on usage time, increased break time,
The work environment has been improved by using chairs and desks that reduce fatigue, and by improving the color tone of the surrounding area.

(Problem to be solved by the invention) However, with conventional measures to prevent operator fatigue, there is no effective way to improve the equipment heart other than adding coatings, filters, and displaying black characters on white backgrounds, so no further improvements have been made. Not yet.

For this reason, it is necessary to prevent fatigue during use, and efforts are being made to limit usage time, increase break time, and improve the working environment. However, shortening operating time and increasing break time will reduce work efficiency, and it is impossible to create an optimal working environment for all operators due to individual differences among operators. This countermeasure in terms of usage results in a decrease in work efficiency, which goes against the purpose of introducing OA equipment.

An object of the present invention is to obtain a CRT display device that is less tiring than the conventional one.

[Structure of the invention]

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a signal input section for inputting a display input signal, a luminance/color signal generation section for generating a luminance/color signal, and a signal input section for inputting a display input signal; a display signal combination unit that performs rough combination of the input signal and the luminance/color signal and outputs a display signal, a display signal output e that outputs the display signal to the CRT, and an optical sensor that measures the illuminance at the location where the CRT is installed; A CRT characterized by comprising a display signal control section that controls a display signal to the CRT using a signal from a sensor.
Provide a display device.

(Function) In the device configured in this way, the optical sensor detects C.
Since the illuminance of the RT installation location is measured and the CRT display signal is subsequently controlled by the signal from the sensor, the brightness of the CRT is automatically adjusted according to changes in the illuminance of the CRT installation location, reducing eye fatigue.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a block diagram of a CRT display device 20. As shown in FIG.

Display input signals from various devices are inputted to the signal input section 11, and the display input signal from the signal input section 11 and the luminance/color signal from the luminance/color signal generation section 13 are combined by the one display code combination section 12. The display signal output section 14 performs processing for outputting the display signal to the CRT 15.
At step 15, the display signal is displayed on a screen. Additionally, a filter 16 is added to the screen of the CRT 15 to prevent fatigue.

In this embodiment, from the illuminance measured by the optical sensor 17, C
The brightness of the output signal to RT15 is adjusted.

That is, the optical sensor 17 is attached to the CRT display device 2o as shown in the sectional view of the CRT 15 in FIG.

The optical sensor light receiving section 17a is connected to the screen display section 15a of the CRT 15.
The amount of light (illuminance) in the same direction as the natural light and illumination hitting the screen display section 15a is measured.

The optical sensor 17 is composed of an element that outputs the amount of light input to the sensor as a change in electrical resistance, and outputs a signal to the display signal control section 18 by using the measured amount of light as illuminance data.

The display signal control section 18 outputs a control signal for controlling the display signal output section 14 from the signal from the optical sensor 7.

Since the display signal output section 14 amplifies the brightness of the display signal from the display signal combination section 13 to a level to be displayed on the CRT 15, this amplification is controlled by the control signal from the display signal control section 18. , the display brightness on the CRT 15 can be controlled.

The illuminance of the place where the CRT display device 20 is installed is tens of thousands of lux during the daytime when sunlight is incident on a clear day. On the other hand, indoor lighting alone after sunset varies widely, at 40 lux (the lowest illuminance standard for general offices).

Since the display brightness of the CRT 15 of the CRT display device 20 does not have a wide enough range to accommodate the range of illuminance change, the display signal control section 18 performs control in the following manner.

As shown in the block diagram of FIG. 3, the display signal control section 18 includes an input circuit 21, an arithmetic circuit 22, and a data conversion circuit 23.
, and an output circuit 24.

The illuminance data signal from the optical sensor 17 is input to the input circuit 2L. The input circuit N21 amplifies the input illuminance data signal to a level required for calculation, and outputs it to the calculation circuit 22. The arithmetic circuit 22 detects the level of the illuminance data signal, sets a control signal, and outputs the control signal to the output circuit 24 as a process for outputting a control signal for the signal output section 14 from the input illuminance data signal.

To set the control signal, the data conversion circuit 23 converts the illuminance data signal into brightness data corresponding to the illuminance data signal, and sets the control signal from the brightness data.

As shown in the graph of FIG. 4, the data conversion circuit 23
Illuminance-luminance conversion is performed according to a fixed pattern. Figure 4 shows a logarithmic scale with illuminance as the horizontal axis.
A proportional scale is used with the luminance of 5 as the vertical axis. As an example of the conversion, as shown in FIG. 4, when the illuminance is less than 40 lux (minimum illuminance in a general office), the brightness of the CRT 15 is set to the lowest visible brightness. In the case of 150 lux (recommended illuminance for general offices), the brightness of CR'r15 is set to the intermediate value between the highest and lowest. For 10,000 lux, CRT
The brightness of 15 is the highest value. C for 10,000 lux or more
The brightness of RT15 remains at its highest value.

In Figure 4, 40 lux, 150 lux, too
o.

Point A is the point where the slope of the line changes in lux.

Point B is set as 6 points, and points A and B correspond to individual differences in how operators feel about brightness.

The configuration allows the brightness to be changed by operator input.

Since an operator's request can be input to the data conversion circuit 23 through the adjustment unit 19, the illuminance-luminance conversion pattern of the data conversion circuit 23 is controlled by the input from the adjustment unit 19. Control is 5! Based on the input from the node 19, the brightness at point A at 40 lux and the brightness at point B at 150 lux
Change the brightness in lux as required by the operator,
Due to the changed illuminance-luminance conversion pattern, the calculation circuit 2
The illuminance data input from step 2 is converted into predetermined brightness data.

The arithmetic circuit 22 inputs the luminance data converted by the data conversion circuit 23 , sets a control signal for the display signal output unit 14 corresponding to the luminance data, and outputs it to the output circuit 24 .

The output circuit 24 receives a control signal from the arithmetic circuit 22.

After amplifying it to a predetermined value, it is output to the display signal output section 14.

The display signal output section 14 is the output circuit 2 of the display signal control section 18.
The brightness of the display signal to the CRT 15 is controlled by the control signal from 4.

By the above method, the brightness of the display signal to CRTI5 is CR
Since the T display device 20 can be changed in accordance with the illuminance of the place where it is installed, and the pattern of change can also be changed by input from the operator, the display can be performed at the brightness of the operator's preference. can.

In addition, although the above embodiment was explained using a CRT as the claw device, OA can be used as a display device other than a CRT.
Liquid crystal displays used in equipment, etc.

Even if an optical display device such as a plasma display is used, CR
It is possible to obtain the same anti-fatigue effect as T.

〔Effect of the invention〕

According to the present invention, the display signal to the CRT is automatically controlled to the brightness corresponding to the illuminance, so when the illuminance is high during the day, the CRT
When the brightness of the CRT is high and the illuminance is low, such as when there is only room lighting after sunset, the brightness of the CRT is lowered, which can reduce eye strain on the operator who uses the CRT display device for a long time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a CRT display device according to an embodiment of the present invention, FIG. 2 is a sectional view of the CRT display device, FIG. 3 is a block diagram of a display signal control section, and FIG. 4 is an illuminance-luminance conversion FIG. 5 is a block diagram of a conventional CRT display device. 11...Signal input section, 12...Display signal combination section. 13... Luminance/color signal generation section. 14...Display signal output section, 15...CRT, 17
. . . Optical sensor, 18 . . . Display signal control unit. Agent Patent Attorney Noriyuki Chika

Claims (1)

[Claims] a signal input section that inputs a display input signal; a luminance/color signal generation section that generates a luminance/color signal; a display signal combination section that combines the display input signal and the luminance/color signal to output a display signal; The device comprises a display signal output unit that outputs the display signal to the CRT, an optical sensor that measures the illuminance at the location where the CRT is installed, and a display signal control unit that controls the display signal to the CRT using the signal from the optical sensor. A CRT display device characterized by: