Field-Sequential Display Color Break Reduction via Light Source Control
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Solution Overview
Problem
Field-sequential liquid crystal display apparatuses suffer from significant color break issues, particularly when displaying moving images, due to the sequential display of red, green, and blue subframes, which are not effectively controlled by existing methods, leading to noticeable color breaks and inefficient power usage.
Innovation Solution
An image display apparatus with a light-source unit that controls the light sources for each color on a per-subframe basis, using a color break strength calculating unit to determine the noticeability of color breaks and adjust the light output accordingly, incorporating an extension subframe period to enhance the visibility of the color with the highest break strength and reduce overall color break visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If field sequential display method is used to eliminate color filter and improve light use efficiency, then light use efficiency is improved (about 3 times higher), but color break is generated due to sequential display of R, G, B subframes
Solution Approach 1:
The frame period is divided into multiple subframe periods (first through fourth subframes), with each subframe displaying different color components. The fourth subframe specifically addresses color break by displaying mixed colors based on statistical processing of the original image signal, thereby segmenting the display task to eliminate color break while maintaining high light efficiency.
Solution Approach 2:
The invention changes the display parameters by introducing a fourth subframe that displays mixed colors (non-3-primary colors) determined through statistical processing of the RGB image signal. This parameter change allows the system to adaptively compensate for color break without returning to color filter-based display, thus maintaining high light efficiency while reducing color break.
2Object-affected harmful factors
If fourth subframe displays mixed colors to reduce color break, then color break is reduced, but multiple light sources must light on simultaneously increasing power consumption
Solution Approach 1:
The fourth subframe displays mixed colors only in regions where color break is likely to occur, rather than illuminating all pixels with all colors simultaneously. By using statistical processing to identify and target specific regions needing color break compensation, the system reduces unnecessary power consumption while effectively addressing color break where it matters.
Data Source
AI summary
An image display apparatus operates in field sequence mode which effectively reduces the generation of color break. A color break strength calculating unit determines a color break strength that indicates the noticeability of the generation of the color break. A light-source signal generating unit controls each light source so that as the color break strength of a color mixed component having the highest color break strength is higher, the color mixed component is contained more in light output from a light-source unit during the extension subframe period. If there is present a first pixel region as an area including one or more pixel formation regions where an image containing the component of interest is displayed, the color break strength of the component of interest increases more as a magnitude of the component of interest is larger in the first pixel region.