Color display system

Abstract

A color display device including: at least one spatial light modulation element forming a display picture by modulated light obtained by modulating illumination light, a color sequential light generation device changing in a time series the illumination light or the modulated light into multiple groups of different color lights in one frame of a display period of the display picture, a control device controlling the spatial light modulator, and a color sequential light generation device based on the input picture data. The control device controls the spatial light modulator and the color sequential light generation device to change the ratio of the display time of each color of the reflected light time-shared in the display period of the frame depending on the character and / or the set value of the input picture data.

Description

[0001]This application is a Non-provisional application claiming a Priority date of Mar. 2, 2007 based on a previously filed Provisional Application 60 / 904,564 filed by the common Applicants of this Application and the disclosures made in Provisional Application 60 / 904,564 are further incorporated by reference.BACKGROUND[0002]1. Field of Invention[0003]The present invention relates to a color display apparatuses. More particularly, this invention relates to color image display systems implemented with an effective color display technique for controlling display light for each color of the primary colors.[0004]2. Prior Art[0005]Color image display systems are known and commonly implemented with color displays using three primary colors of red, green and blue. However, such display systems still have limitations for further improvement of display qualities as will be further discussed below.[0006]U.S. Pat. No. 5,448,314 discloses a technique for displaying a color image by projecting ...

AI Technical Summary

Benefits of technology

[0010]The present invention discloses a color display technique for improving the color balance and brightness of a display picture by applying a dynamic color brightness control corresponding to the characteristics of the input picture data related to the relative brightness of each color.

[0011]Another advantage of the color image display system disclosed by the present invention is the implementation of a color display technique for increasing the displayed gray-scale level of each color depending on the characteristics of the input picture data.

[0015]The control device controls the spatial light modulator and the color sequential light generation device to change a ratio of a display time of each color of the illumination light or the modulated light time-shared in the frame period depending on the characteristic and / or the set value of the input image data, and to increase a number of gray-scale levels of brightness of an image of a color whose ratio of the display time is increased.

[0021]The control device compares brightness of each color included in the input image data and determines a dark color and a bright color, and controls the spatial light modulator and the color sequential light generation device to change the ratio of the display time of each color so as to decrease display time of the dark color and to increase display time of the bright color.

[0024]The ninth aspect of the present invention is based on the color display device according to the first aspect. In the color display device, the control device controls the spatial light modulator and the color sequential light generation device to increase a ratio of display time of a desired color.

[0035]The twentieth aspect of the present invention is based on the color display device according to the eighteenth aspect. In the color display device, the control device generates the modulation control signal to change a combination of the ON state, the OFF state and the oscillation state depending on the ratio of a display time of each color in the frame period, so as to increase a number of gray levels of an image formed by the spatial light modulator.

Problems solved by technology

However, such display systems still have limitations for further improvement of display qualities as will be further discussed below.

It is difficult to improve the brightness corresponding to the picture data.

The control of the brightness of each color is still limited due to the limitation that the brightness control cannot be directly corresponding to the characteristic of the color combination of input picture data.

The quality of the image display is degraded due to the limitation that a dynamic brightness control of each color cannot be performed.

Furthermore, the limitation of not able to flexibly control the brightness of each color in each display frame further limits the resolution of the gray-scale levels

Images