JPH06337401A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to enable the brightness of the backlight of the liquid crystal display to be freely adjusted depending on the position of the operator. [Structure] An ultrasonic sensor 4 is installed in a liquid crystal display 1, a distance from an operator is measured by the ultrasonic sensor 4, and the brightness of the backlight 2 is automatically adjusted according to the distance. The liquid crystal display of the present invention eliminates the need to adjust the backlight each time the operator changes the display viewing position.

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 which is a display device of a word processor or personal computer which is an OA tool.

[0002]

2. Description of the Related Art In recent years, the demand for portable word processors and personal computers such as laptops and notebooks has been increasing.

A conventional liquid crystal display will be described below. In the conventional liquid crystal display, the adjustment of the brightness of the backlight requires the operator to adjust the brightness to a brightness that is easy to see one by one.

[0004]

However, if the brightness of the backlight of the conventional liquid crystal display is adjusted to a brightness that is easy to see at first, the brightness of the backlight is constant even if the operator moves his or her face close to or away from the display. Therefore, when the operator changes the position at which the display is viewed, the backlight becomes too bright or too dark, making it difficult to see. Therefore, the operator himself has to readjust the brightness. Even when the operator left his seat, the backlight was still on and wasting power.

The present invention has been made in consideration of the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display capable of automatically adjusting the brightness of a backlight and saving unnecessary power.

[0006]

In order to solve the above problems, the present invention uses an ultrasonic wave emitting means, an ultrasonic wave sensor for receiving an ultrasonic wave reflected by an operator, and a signal received by the ultrasonic wave sensor. The liquid crystal display is configured to have a means for measuring the distance and a means for adjusting the brightness of the backlight according to the determined distance.

[0007]

With the above means, the distance between the display and the operator is measured, and the brightness of the backlight is automatically adjusted according to the distance.

[0008]

EXAMPLE An example of the present invention will be described below. FIG. 1 is a block diagram of the present invention, and FIG. 2 is an external view of the liquid crystal display. Each block in the configuration diagram will be described. 1 is a liquid crystal display. 2 is the liquid crystal display 1
It is the backlight installed in. Reference numeral 3 is a CPU that controls the entire apparatus. An ultrasonic sensor 4 is attached to the liquid crystal display 1. Reference numeral 5 is a power supply unit of this apparatus. The ultrasonic wave emitting device is omitted in the figure.

Next, the specific operation of the apparatus will be described with reference to this configuration diagram. The ultrasonic waves emitted from the ultrasonic wave emitting device are reflected by the operator and reach the ultrasonic sensor 4. From the information of the ultrasonic sensor 4, the CPU 3 calculates the operator distance. As shown in FIG. 3, when the operator brings his face closer to the liquid crystal display 1 and the distance is reduced, the brightness of the backlight 2 is lowered, and when the operator is slightly away from the liquid crystal display 1 and the distance is increased, the brightness of the backlight 2 is increased. . As a result, the display becomes slightly darker as the operator approaches the liquid crystal display 1 and becomes brighter as the operator leaves, so that a display that is easy for the operator to see can be obtained at all times. If the distance from the operator is a certain size (1 m or more), the CPU 3
If it is detected that the operator has left the seat, the power supply to the liquid crystal display 1 is cut off.

As described above, by measuring the distance between the liquid crystal display 1 and the operator and controlling the brightness of the backlight 2 in accordance with the distance, the backlight is changed every time the operator views the liquid crystal display 1. 2 It is possible to save the trouble of adjusting the brightness so that it is easy to see. In addition, when the operator leaves the seat, it is detected and the power supply is cut off, so that power saving can be realized.

[0011]

As is clear from the above description of the embodiments, the liquid crystal display of the present invention eliminates the need to adjust the brightness of the backlight each time the operator changes the position at which the display is viewed, and has low power consumption. LCD display can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram of a liquid crystal display according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the liquid crystal display.

FIG. 3 is a change characteristic diagram of backlight luminance of the liquid crystal display.

[Explanation of symbols]

 1 Liquid Crystal Display 2 Backlight 3 CPU (Central Processing Unit) 4 Ultrasonic Sensor 5 Power Supply

Claims (2)

[Claims] 1. An ultrasonic wave emitting device, an ultrasonic wave sensor for receiving an ultrasonic wave emitted from an operator, a means for measuring the position of the display and the operator, and a brightness of the backlight according to the distance between the display and the operator. Liquid crystal display with means for automatic adjustment. 2. The liquid crystal display according to claim 1, further comprising means for cutting off the power source of the backlight if the distance between the measured display and the operator is larger than a certain value.