JPH0317695A - Brightness adjusting device for crt - Google Patents

Abstract

PURPOSE:To reduce the fatigue of the eye by inputting working environment illuminance and a working time to a fuzzy inference device, and sending a brightness control command to an output device and adjusting the brightness of the CRT automatically. CONSTITUTION:The fuzzy inference device 3 finds degrees matching membership functions corresponding to fuzzy rules 1 - 4 where given input quantities X1 and X2 are set. In the respective fuzzy rules 1 - 4, the input quantity X1 or X2 which is less in adaption degree is selected (MIN arithmetic) and membership functions regarding the brightness control command Y1 of the fuzzy rules are decided according to the selected degree of adaption. The decided membership functions regarding the brightness control command Y1 of the fuzzy rules 1 - 4 are all put one over another (MAX arithmetic) to obtain a final membership function. The center of gravity of the final membership function is found to obtain a determined brightness control command Y1, which is supplied to the output device 4.

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a brightness adjustment device for a CRT (cathode ray tube).

<Prior Art> Conventionally, the brightness of a CRT has been manually adjusted by the worker using the CRT at appropriate times to reduce eye fatigue depending on the surrounding environment (room brightness) and working time. was adjusting.

《Invention or problem to be solved〉 However, as mentioned above, because the brightness is adjusted manually, (1) Brightness adjustment is troublesome.

(2) The time to adjust the brightness is when the operator feels that his or her eyes are getting tired, and there is a delay in adjusting the brightness. (3) Immediately after adjusting the brightness, the eyes quickly adapt to the changes in CRT brightness {4} If you adjust the brightness to a low level from the beginning because it makes your eyes tired, the screen on the CRT will be difficult to see during the initial work. Even though the work is very tiring on the eyes, manual brightness adjustment does not effectively reduce eye fatigue due to brightness adjustment, and the problem is that it causes a lot of eye fatigue for the workers. there were.

The present invention was developed in view of the above-mentioned problems, and its purpose is to automatically adjust the brightness of a CRT using fuzzy reasoning, thereby reducing eye fatigue. An object of the present invention is to provide a CRT brightness adjustment device that enables brightness reduction.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a first input device for detecting work environment illuminance and a second input device for detecting work time.
an input device; A fuzzy inference device outputs a fuzzy inference one-time control command based on input quantities of work environment illuminance and work time detected by a second input device to create a fuzzy rule. The configuration includes an output device that adjusts the brightness of the CRT in response to a brightness control Dll command from the fuzzy inference device.

<<Operation>> The working environment illuminance and working time are input into the fuzzy inference device, a brightness control command is sent to the output device, and the n degree of the CRT is automatically adjusted.

<<Example>> Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure shows an explanatory diagram of the configuration of a CRT+7JjQi degree adjustment device according to the present invention. In the figure, 1 is the first input device that detects the illuminance of the working environment (bright, dark), 2 is the second input device that detects the working time (long, short), and 3 is the fuzzy inference device. be.

4 is an output device for adjusting the brightness of the CRT. 4 The first input device 1 is connected to the input terminal 7 of the fuzzy inference device 3 via a sample and hold circuit 6, and the second input device 2 is a sample and hold circuit. It is connected via a circuit 5 to an input terminal 8 of the fuzzy inference device 3. Fuzzy inference device 3
The output terminal 9 of is connected to the output device 4 via an amplifier 10.

FIG. 2 shows the membership function of the input quantity X1 obtained by passing the detected data S, detected by the first input device 1 through the sample-and-hold circuit 6, and the detected data S2 detected by the second input device 3 is shown in FIG. A membering function of the input quantity X2 obtained through the sample and hold circuit 5 is shown in FIG.

In FIG. 2, the horizontal axis is a variable of input amount X1 (illuminance 0.
300, 500, 1000 lux), and on the vertical axis, these variables are represented by linguistic expressions ZR, PS, P~.1, PL, etc. That is, ZR is almost zero, p
s is 300 lux, PM is 500 lux, PL is 10
Each represents 00 lux. Note that NL represents a large value of shellfish, NM represents a medium negative value, and NS represents a small negative value.

Also, in Figure 3, the horizontal axis shows the input jtX2 variable (
The working time) is represented, and on the vertical axis, these variables are represented by the linguistic expressions PS, PM, and PL.

Further, the output amount to the first output device 4, that is, the membership function of the brightness control command Y1 is shown in FIG. Fourth
In the figure, the horizontal axis is the variable of the brightness control command Y (dark...
On the vertical axis, these variables are represented by linguistic expressions ps, pX1, PL, etc. That is, ZR represents approximately zero, PS represents a small positive value (dark), PM represents a medium positive value (slightly dark), and PL represents a large positive value (bright).

The fuzzy inference device 3 receives inputs JL Xl , X 2
Based on this, fuzzy inference is performed according to a predetermined fuzzy rule to derive the brightness control command)'1.

This fuzzy rule is called an if theq rule, and includes the following fuzzy rules.

(Fuzzy rule l) Rashi, iif), input amount X1 or 300 lux, input amount
2 is about 1 hour ('. h e r.
! , set the brightness control command Y1 to a medium (slightly dark) value.

Simplifying this, ifX,=PS,X2''PS,the!IY,=PM.

(Fuzzy Rule 2) If (if) the input fkX1 is 1000 lux and the amount of human power X2 is about 3 hours, then fthe*), set the brightness control command Y to a small (dark) value.

If this is simplified, ifX, =PS. X 2 =PL, jl;
er. Y. =PS. (Fuzzy rule 3) If [if), input amount X1 or 1000 lux, input i
The fortune telling is about 1 hour or so.+then! ．． Set the fl degree control command Y1 to a large (bright) value.

Simplifying this, ifX+ = PL. X2 = PS, please! I't'
, = PL.

(Fuzzy Rule 4) (ifj, if the input amount X1 is 1000 lux and the input amount X2 is about 3 hours, then itenl, set the brightness control command Y+ to a medium (slightly dark) value.

Simplifying this, ifX,=PL,X2=PL, :he! IY,=PM
becomes.

Next, the effect will be explained.

In the fuzzy inference device 3, the given input jLX+
．． The degree to which X2 matches the corresponding member function of fuzzy rules 1 to 4 by 5m is determined.

Input amount X1 and input amount X in each fuzzy rule 1 to 4
The one with the smaller fitness of 2 is selected (M I N operation)
, the member symp function related to the brightness control command Y1 of the fuzzy rule is determined based on the selected degree of fitness t'L.

The membership functions regarding the brightness control command Y1 of all these cut fuzzy rules 1 to 4 are superimposed (MAX operation) to obtain the optimal member zip function. By determining the center of gravity, a determined brightness control command Y1 is obtained, and this is given to the output device 4.

Therefore, the brightness of the CRT can be automatically adjusted to reduce eye fatigue of the operator.

<<Effects of the Invention>> As explained above, the present invention includes a first input device that detects work environment illuminance, a second input device that detects work time, and a first input device that detects work environment illuminance. A second input device includes a fuzzy inference device that performs fuzzy inference using the detected work environment illuminance and work time as input quantities and outputs a brightness control command according to fuzzy rules, and a CRT that receives a brightness control command from the fuzzy inference device.
Since it is equipped with an output device that adjusts the brightness of the computer, the working environment illuminance and working time are input to the fuzzy inference device, fuzzy inference is performed according to the fuzzy rules, and a brightness control command is sent to the output device. Automatically ffll brightness of CRT! I can do something.

Therefore, it is possible to reduce eye fatigue of the fF operator.

[Brief explanation of drawings]

Fig. 1 is a configuration explanatory diagram showing an embodiment of the brightness adjustment M device for CRT according to the present invention, Fig. 2 is a diagram showing the membership function of the input amount Diagram showing the messibaship function of the input amount X2, which is the work time, 4th
The figure is a diagram showing a member function of the output amount which is the brightness control command Y1. 1...First input device. 2... second input device, 3
... Fuzzy inference device, 4... Output device. $21!1 HS Figure 4

Claims (1)

[Claims] A first input device detects work environment illuminance, a second input device detects work time, and the work environment illuminance and work time detected by the first and second input devices are inputted according to fuzzy rules. A CRT brightness adjustment device comprising: a fuzzy inference device that performs fuzzy inference and outputs a brightness control command; and an output device that adjusts the brightness of a CRT in response to a brightness control command from the fuzzy inference device.