JPH0926565A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of the whole of a device by reducing the ruggedness of a housing, simplifying structure of the housing and also reducing the volume for adjusting the brightness of a back light. SOLUTION: The pressure from the outside is detected by a housing sensor part 4 and the potential change of sensor 4 becomes a detection signal 8 to be transmitted to a signal converting part 9. In the signal converting part 9, the detection signal 8 is made to be a potential to be compared with a certain threshold value and when the potential exceeds the threshold value, the potential is made to be in an on-state and then is outputted as a comparator signal 11. The comparator signal 11 is decoded in a back light brightness adjusting part 10 and the brightness of the back light in a liquid crystal display is adjusted. At this time, when the comparator signal 11 is in the on-state, the brightness value becomes brighter until a linearly maximum value and when the value exceeds the maximum value, the brightness of the back light becomes a minimum brightness and then the brightness linearly increases again in the back light adjusting part 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a backlight control device for adjusting the brightness of a backlight.

[0002]

2. Description of the Related Art Conventionally, this type of liquid crystal display device has a backlight brightness adjusting function for clearly reading displayed characters and figures, and a user may use an external device depending on the brightness of the installation environment of the display device. I had to adjust the volume manually.
(See, for example, Japanese Patent Laid-Open No. 4-267217)

Since the above-mentioned conventional liquid crystal display device requires an external volume control, it is necessary to secure a space for the volume section in the casing, which complicates the casing structure. There's a problem. The object of the present invention is to mount the housing sensor function inside the housing,
The purpose is to eliminate the backlight brightness adjustment switch and simplify the housing structure to increase the strength.

[0003]

A liquid crystal display device according to the present invention includes a housing sensor section for detecting an external pressure applied to adjust the brightness of a backlight, and a brightness for adjusting the brightness of the backlight in the display device. An adjustment unit and a signal conversion unit that controls the brightness adjustment of the backlight based on the detection result are configured.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention.
In the embodiment, a liquid crystal display 1 is used as a display device as an information processing device, and a personal computer 3 having a keyboard 2 as an input device is used. Further, in order to adjust the brightness of the backlight of the liquid crystal display, the housing sensor unit 4
have.

FIG. 2 is a schematic diagram for explaining the housing sensor section 4. The housing sensor unit 4 has electrodes arranged vertically in a matrix in parallel with the housing 5 (made of synthetic resin),
By applying pressure from the housing surface, the upper electrode 6 wired in the housing is distorted, and the potential between the upper electrode 6 and the lower electrode 7 is displaced. The potential is detected signal 8
And is sent to the signal conversion unit 9.

FIG. 3 is a block diagram for explaining the operation of FIG. Pressure from the outside is detected by the housing sensor unit 4 and a change in the potential becomes a detection signal 8, and the detection signal 8 is sent to the signal conversion unit 9. The signal conversion unit 9 compares the detection signal 8 as a potential difference with a certain threshold value, and when it exceeds the threshold value, outputs the comparison signal 11 as an ON state. The comparison signal 11 is decoded by the backlight brightness adjusting unit 10 and the brightness of the backlight in the liquid crystal display is adjusted. Here, in the backlight luminance adjusting unit 10, the luminance value linearly brightens to the maximum value when the comparison signal 11 is in the ON state, becomes minimum luminance when exceeding the maximum value, and linearly increases the luminance again. It has a circuit configuration.

[0008]

As described above, the liquid crystal display device of the present invention can reduce the unevenness of the housing, simplify the structure, and further reduce the volume for brightness adjustment, thereby reducing the entire device. Has the effect of increasing the strength of.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a housing sensor unit.

FIG. 3 is a block diagram illustrating the operation of the present invention.

[Explanation of symbols]

 1 Liquid Crystal Display 2 Keyboard 3 Personal Computer 4 Housing Sensor 5 Housing 6 Upper Electrode 7 Lower Electrode 8 Detection Signal 9 Signal Converter 10 Backlight Brightness Adjuster 11 Comparison Signal

Claims (1)

[Claims] 1. A device for detecting a distortion generated when a device operator contacts the information processing device body, a device for adjusting the brightness of a backlight in a display device, and a device for adjusting the brightness of the backlight from the detection result. A liquid crystal display device having a signal converting means for controlling.