JPH01261694A - Crt device with automatic luminance adjusting function - Google Patents

Abstract

PURPOSE:To cause a CRT device to create an easily visible picture state to the operator of the device by securing a specific difference between the pure luminance of the CRT and the ambient brightness. CONSTITUTION:The luminance on the pure surface in a CRT device A is measured by means of a light quantity measuring instrument B provided in the vicinity of the pure surface and the intensity of luminance in the surrounding area of the operator of the device A is measured by means of an intensity of luminance measuring device C provided on a tablet board D. Then the input values of the instruments B and C are compared with each other and, when the difference in brightness between both input values exceeds a specific value, the luminance of the CRT is adjusted so as to reduce the magnitude of the difference. Therefore, the luminance of the CRT is adjusted automatically and can be maintained in the optimum state, because the difference between the luminance of the CRT and ambient brightness of the CRT can be maintained at a fixed level.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a CRT device, and in particular, it
The present invention relates to a CRT device with an automatic brightness adjustment function suitable for unfavorable environmental conditions in which the screen becomes difficult to view due to changes in the brightness around the RT viewer surface.

[Conventional technology]

Conventional CRT devices respond to changes in ambient brightness.
A person could change the brightness of the T-viewer screen to create an easy-to-read screen. In recent years, CRT devices have become the mainstream device for man-machine interfaces in OA equipment, etc., and the number is increasing, so it is not always possible to provide a good installation environment. There are also frequent opportunities to adjust the brightness.

[Problem to be solved by the invention]

The above conventional technology has a problem in that it does not take into consideration automatically adjusting the viewer brightness to provide an appropriate screen condition according to changes in the brightness of the surrounding environment, and the only way to deal with it is by the CRT operator. It was.

An object of the present invention is to obtain input signals from a device installed near a CRT viewer to measure the amount of light output from the CRT, and an illuminance measurement device installed near a CRT operator (light pen stand, mouse, tablet board, etc.). To provide a CRT device that optimizes CRT screen brightness by comparing brightness data and keeping the deviation within a certain range.

[Means to solve the problem]

The above object is achieved by installing sensors for measuring brightness near the CRT viewer and near the operator, and providing the CRT device with a control mechanism for keeping the deviation within a certain range.

In other words, we focused on the fact that the brightness of a single screen only needs to be within an appropriate range of deviation from the surrounding brightness, and developed a control device that automatically adjusts the screen brightness by comparing the output light amount of the viewer with the brightness of the operator's environment. By providing this, it becomes possible to provide a control system that can determine the optimum value of brightness without relying only on the brightness of the viewer itself.

Furthermore, although the brightness of a CRT viewer decreases over time, the single-bokuto type allows the output light amount to be adjusted to follow the decrease in brightness.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

A light intensity measuring device installed near the viewing surface within the CRT device measures the brightness of the viewing surface, and an illuminance measuring device installed on the tablet board measures the illuminance around the operator.

The respective input values are compared, and if the deviation in brightness between the two is above a certain level, the brightness of the CRT is adjusted to reduce the amount of deviation.

According to this embodiment, it is possible to keep the deviation between the internal brightness of the CRT device and the brightness of the surroundings constant, and the deviation due to the influence of external light etc.
If the RT screen is difficult to view, the brightness is automatically adjusted to maintain optimal brightness.

FIG. 2 shows a block diagram of the control system.

〔Effect of the invention〕

According to the present invention, since it is possible to always maintain a certain difference between the brightness of the CRT viewer and the brightness of the surrounding environment, it is possible to provide the operator with an easy-to-read CRT screen condition.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are a device configuration diagram and a control system block diagram, respectively, of an embodiment of the present invention. A...CRT device, B...light measurement device, C...
Illuminance measuring device [, D...Tablet board, E...Brightness control device, L-J

Claims (1)

[Claims] 1. In a CRT device that has a measurement device that measures illuminance or light intensity and a function that can adjust the brightness of the CRT viewer surface,
A CRT device with an automatic brightness adjustment function, which automatically adjusts the brightness of a CRT viewer surface according to external brightness by linking a measuring device and a brightness adjustment mechanism.