Display Light-Source Sequencing to Reduce Field-Sequential Color Breaking
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Solution Overview
Problem
Display devices using the field-sequential color (FSC) system experience color breaking due to rapid switching of primary color light sources between on and off states, which affects color reproduction.
Innovation Solution
A display device with a light source system comprising multiple light sources controlled by a controller to produce multiple lighting periods during a frame image output, utilizing different lighting patterns to reduce color breaking while maintaining color reproduction, including an intermediate category transition to minimize sudden luminance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light sources for primary colors are switched between on and off at high luminance in a very short cycle, then color reproduction speed is improved, but color breaking occurs
Solution Approach 1:
The patent segments the light source control into multiple lighting periods within a frame, with each period dedicated to a specific color. Instead of rapidly switching between all three colors, the system divides the frame into sequential lighting periods for red, green, and blue light sources, allowing each to illuminate at high luminance for a sustained duration without causing color breaking
Solution Approach 2:
The patent implements periodic action by creating multiple lighting periods within a single frame, where each primary color light source is activated in sequence during its designated lighting period. This periodic illumination pattern allows each color to be displayed at high luminance for a sufficient duration while maintaining overall color reproduction through the sequential arrangement of lighting periods
2Manufacturing precision
If multiple lighting patterns are used to reproduce different color gamuts, then color reproduction quality is improved, but control complexity increases
Solution Approach 1:
The patent applies dynamics by making the lighting pattern adaptable and changeable based on the input image characteristics. The controller dynamically selects appropriate lighting patterns from multiple available patterns, adjusting the lighting configuration to match the color requirements of different images, thereby achieving high color reproduction quality without requiring a fixed complex control system
Solution Approach 2:
The patent utilizes parameter changes by varying the lighting pattern parameters (such as the duration and sequence of lighting periods for each color) to reproduce different color gamuts. By changing these control parameters based on the input image data, the system can optimize color reproduction quality for different content types while keeping the underlying control architecture relatively simple
Data Source
AI summary
A display device includes: a light source device including a first light source, a second light source, and a third light source; a display; a storage configured to store data indicating a lighting pattern of the light source device; a controller configured to control the lighting pattern based on the input data and the data. The controller is configured to produce n lighting periods during a display output period of a frame image. Colors of light from the light source device during the n lighting periods differ from one another. The data includes information indicating lighting patterns that allow different color gamuts to be reproduced in the n lighting periods. The controller is configured to control, when the color reproduction changes, the lighting pattern based on a difference between the lighting pattern for the input data before the change and the lighting pattern for the input data after the change.