JP2010097155A - Lighting device for storage-type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage-type display device with less power consumption configured to easily recognize a display content even when the device is in a dark environment, and also, configured to prevent a change in color temperature of the display screen caused due to the hue of external light. <P>SOLUTION: The light-emitting body is disposed so that the display part can be recognized even when the external brightness changes. The luminance of the light-emitting body is changed based on the results of the detection of the external brightness, the detection of the presence of persons in the vicinity of the display part or the time zone. Alternately, the luminance is intermittently changed, so as to enhance the attention. The luminance of the light-emitting body is controlled, accordingly, energy consumption is reduced as compared with the manner in which the light-emitting body is continuously lighted. The color temperature of the display part can be kept constant by detecting the hue of the external light and changing the hue of the light-emitting body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to illumination of a reflective memory type display device that does not self-emit light.

Sequentially rewritable liquid crystal display elements are the mainstream in the cry for CO2 reduction and energy saving, but in the future, replacement with reflective memory type display elements with very low power consumption will progress as a specific application . Since the memory-type display device does not self-emit, a light emitter is arranged in the device to detect the state of the environment and create an optimum display state.

Problems to be solved by the invention

Since the reflective memory display device does not self-emit, the surroundings become dark and the display becomes dark when the incident light is reduced. Therefore, it is necessary to supplement the light corresponding to the brightness of the environment. It is also necessary that the display can be corrected when the hue of the incident light changes.
In the method of simply placing an alternative light emitter for incident light from the outside around the display section where the hue of the incident light changes and the color temperature of the display device changes due to differences in the installation environment, such as sunlight or lighting lamps Power consumption increases.

How to solve the problem

A light-emitting body is added to the display device so that the brightness and color temperature of the display surface can be adjusted.
External brightness is detected and the brightness of the light emitter is controlled to ensure the visibility of the display surface.
Further, the color temperature of the display surface is made constant by detecting the color temperature of the external light and controlling the hue of the light emitter.

A light emitter is disposed on the side surface of the display device so that the front surface of the display surface can be irradiated with light guides.

Elements for detecting the brightness and hue of external light are arranged around the display device.

The brightness of the light emitter is controlled by the brightness detection value of the external light.

When the detected value is lower than the required brightness reference value, the light from the light emitter is compensated.

For example, when it is used in a public place, the light emitting body is turned off or the brightness is greatly reduced when there are few people such as midnight with a timer function.
Alternatively, the human sensor detects the traffic condition and controls the lighting of the light emitter.

A blinking state that changes the brightness intermittently to increase the degree of attention on a display device installed in a public place.
A lighting period and an extinguishing period are provided in a short repetition. Alternatively, the brightness is changed during the lighting period.

The color temperature data obtained from the external brightness detection element is compared with a reference value, and the color temperature of the light emitter is changed and corrected so that the display unit has the reference color temperature.

The invention's effect

The present invention is a display content memory type display element that does not self-emit, and when the incident light from the outside becomes weak or when it is night by the clock function, the display unit is brightened by a light emitter arranged around the display unit. And visibility can be improved.
The illuminant detects the time zone or the presence of a person and changes the brightness intensity or turns it off.
In addition, the brightness is changed intermittently to increase the degree of attention. Thus, by changing the brightness of the light emitter, the power consumption can be reduced as compared with the case where the brightness is continuously constant.
The brightness detector also has a function of detecting the hue intensity, and the color temperature of the display unit can be made constant by changing the hue of the light emitter.

Form of invention

The form of the present invention is shown in FIG.
In a memory-type display element that does not self-emit, an element that detects external incident light or reflected light is disposed in the vicinity of the display portion, and has a function of detecting the intensity or hue of external light or reflected light. In addition, a light-emitting body that brightens the display unit is provided in the vicinity of the display unit so as to have a function of detecting the presence of a person.
The function of changing the brightness of the illuminant in conjunction with the brightness detected in such a configuration, or changing the brightness, and adjusting the color temperature of the display unit by changing the hue of the illuminant in conjunction with the detected hue A function for detecting the presence of a person, turning on and off the light emitter, or changing the brightness of the light emitter, and turning on and off depending on the time of day or a clock function for changing the brightness.

The configuration of only the external incident light without the light emitter When the intensity of the incident light from the outside decreases due to darkness, the display unit becomes difficult to recognize. Screen front illumination method composed of external incident light detector, light emitter and light guide plate. A human presence detector is also installed. The light guide plate emits light from the light emitter only in the direction of the screen. The light is emitted from the light emitter to the display, so that the display can be recognized even if the intensity of incident light from the outside decreases. . Cross section of FIG. The time change of the brightness of external light and the change of the brightness of a display part are shown. When the external light becomes dark, the brightness of the display unit decreases. When the external light intensity decreases, the light emitter is turned on. The display unit has a constant brightness. Indicates the state of control of turning on and off the light emitter by the timer. The time when the external light is darkened is stored, and the light-emitting body is turned on. The lighting time is changed according to the season. Turn off the lights at midnight when traffic is low. It is also possible to control the redness of the light emitter in accordance with the time zone after lighting. Indicates the state of lighting when a person approaches. The light sensor is turned on by detecting that a person has come with a human sensor. It turns off when it detects that there is no person. The brightness may be reduced in the absence of a person. It shows a state where light is turned on and off intermittently, and a state where the brightness is changed intermittently. It blinks at a cycle that is as fast as the person pays attention. If it is not completely extinguished, the brightness will be changed intermittently. Block diagram of detecting the hue of the external light and changing the hue of the light emitter Changing the hue of the light emitter to change the hue of the external light to keep the color temperature of the display unit constant Diagram of color temperature Shows the color temperature of various light sources. Hue diagram 11: Color temperature line

Claims (1)

In a reflective memory-type display device, the external incident light intensity or reflected light is set by installing a light emitting unit that irradiates light from the front surface auxiliary to the display screen and an element that detects external incident light or reflected light from the display image. Detects intensity, controls lighting and extinction of light emitting part, adjusts brightness, or changes brightness intermittently, detects hue of external incident light, or hue of reflected light from display screen Detecting and changing the color temperature of the light emitting unit, or installing an element that detects the presence of a nearby person, turning on and off the light emitting unit, controlling brightness, or controlling intermittently, incorporating a clock, and time A memory-type display device having a light-emitting portion that can be turned on / off, brightness control, or intermittent control in a band.

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