JP2010097157A - Display hue control for non-self luminous storage type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: the color temperature of a display screen changes due to a change in hue of incident light, regarding a reflection type storage display device which is characterized in that the device has low power consumption. <P>SOLUTION: The color temperature of the display screen is kept constant by detecting the hue of the incident light and performing calculation processing so that the color temperature of the display screen may become the desired value using a relational function between the hue of the incident light and the display hue, or detecting the hue of the reflected light and performing calculation processing so that the color temperature of the display screen may become the desired value, or allowing the user to confirm and input the state of light in an external environment, and performing calculation processing so that the color temperature of the display screen may become the desired value using the relational function between the hue of the incident light and the display hue. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

In memory-type display devices that do not self-emit, the color temperature of the display unit can be set arbitrarily.

In a memory-type display device that does not self-emit, the hue of incident light is detected, or the hue of light reflected by the incident light from the display screen is detected to change the hue of the display screen.

Problems to be solved by the invention

In a conventional LCD used as a transmissive display element, a constant hue is emitted from the back side, so that the color temperature is hardly affected by the hue of external light if the hue of the display signal is set to a predetermined value. On the other hand, in the reflective memory display device, the color temperature changes depending on the hue of incident light that is easily changed by the installation environment.

Means to solve the problem

The hue of the incident light is periodically detected, arithmetic processing is performed based on the relationship between the incident light hue and the display hue, the hue data of the image rewriting signal is corrected, and the color temperature is fixed to a necessary set value.
If the color temperature is known in advance in the external light environment, the color of the image rewriting signal is changed by designating the outdoor or indoor fluorescent lamp environment and switching the color data in which the necessary color temperature is selected and set.

FIG. 1 shows a configuration around a display unit that detects the hue of incident light and sets the screen to a set color temperature.

FIG. 2 shows a block configuration of a signal processing mechanism based on the hue detection of incident light. An arithmetic process is performed using a signal obtained by detecting the hue of the incident light by the detection element, a converted value from the function table of the incident light and the display hue, and a color temperature setting value.

A hue correction output value is obtained as a result of the arithmetic processing. With this value, the gain of the image signal amplifier circuit is changed for each hue (for example, R / red, G / green, B / blue).

The relationship between the hue of the incident light and the display hue is already known as a function, and is stored in a program of a microcomputer built in the apparatus, and the drive signal of the display panel is changed by calculating the function table and the detected value of the incident light.

FIG. 5 shows a graph of the color temperature, but the color temperature is determined for environmental conditions, such as an incandescent lamp, a fluorescent lamp, or a sunny day.

FIG. 6 shows a hue diagram. The hue is determined by the balance of the three primary colors of red, green, and blue (RGB). There is a color temperature line indicated by 11 in the hue diagram.
For example, the color temperature when the usage environment is an incandescent lamp is a value larger than 3000 degrees. When the RGB values are set so as to be this value, the color temperature under the incandescent lamp is obtained. It is also possible to set by XY coordinate axis values instead of RGB.
That is, the color temperature of the display unit can be set to a required numerical value by changing the rewrite signal with the RGB value or the XY coordinate axis value. Alternatively, the color temperature of the display portion can be kept constant even when the hue of external light changes.

As shown in Fig. 5, the color temperature can be determined in the environment, so that the color temperature of the display can be kept constant by allowing the person to recognize the environment and enter the conditions such as outdoors on a sunny day or incandescent light. It becomes.

The invention's effect

According to the present invention, even when the color temperature of incident light in a memory type display device that does not self-emit light or the color temperature of a light emitter arranged in the vicinity of the display screen changes, the color temperature of the screen remains constant at the set required color temperature. It becomes.

Form of invention

The form of the present invention is shown in FIG.
Detector for detecting the hue of the external environment, storage circuit for the relational expression between the hue of the external environment and the display hue, this detected value and function table, an arithmetic unit for processing the set value, and the hue of the image signal that can adjust the gain ( RGB) is constituted by an amplifier.
In this configuration, the display element is operated with the adjusted hue (RGB) value to change the hue of the display unit to a required hue.

Image Display Temperature Peripheral Configuration for Adjusting Image Color Temperature by Incident Light Hue Detection The relationship between incident light, a detector for detecting the hue of the light, and the display unit and display light is shown. Block diagram of image color temperature adjustment mechanism by detecting incident light hue. Each functional block and signal flow are shown. Diagram of color temperature Shows the relationship between various environmental conditions and color temperature. Hue Diagram 11: Color Temperature Line Shows RGB (XY) hue diagram and color temperature line.

Claims (1)

By detecting the hue of incident light with a reflective memory display device or detecting the reflected light from the display screen and changing the hue of the display screen, it is possible to achieve a color temperature that requires screen display regardless of the change in the hue of the incident light. Set.

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