Field Sequential Color Display Reducing Saccadic Breakup
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Solution Overview
Problem
Field sequential color display devices suffer from flickering, color breakup, and saccadic color breakup, particularly at high luminance and low temperature, due to the limitations of existing drive circuits and monochromatic display elements with slow response speeds.
Innovation Solution
The proposed solution involves modifying the drive circuit to include an additional green color field in each display frame, where the red and blue light sources are turned on and off in addition to the green light source, creating a sequence of four color fields per frame to reduce color breakup and flickering without significantly increasing frame frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame frequency is increased to reduce flickering and color breakup, then the flicker perception and color breakup are reduced, but the power consumption and heat generation increase significantly
Solution Approach 1:
The patent applies periodic action by dividing each frame into multiple color fields (red, green, blue) that are sequentially displayed at different time intervals. By increasing the number of color fields per frame (e.g., from 3 to 4 or more), the display achieves higher effective refresh rates for reducing flicker perception without requiring the entire system to operate at proportionally higher power levels. The periodic switching of color fields creates the illusion of continuous color display while managing energy consumption through controlled temporal sequencing.
2Reliability
If the response speed of monochromatic display elements is increased to reduce color breakup, then color breakup is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing each frame into multiple sequentially displayed color fields (red, green, blue) rather than attempting to display all colors simultaneously. This temporal segmentation allows the use of simpler monochromatic display elements with slower response times, as each element only needs to respond to its specific color field sequentially. The segmentation of the display timeframe compensates for the slower response speed of individual display elements, reducing color breakup without requiring complex high-speed components.
Solution Approach 2:
The patent applies preliminary action by pre-planning and pre-positioning the sequential color field timing within each frame. The drive circuit is designed in advance to generate the specific sequence of color fields (e.g., red-green-blue-green or red-green-blue-red) with predetermined timing intervals. This preliminary structuring of the display timeline allows slower response display elements to adequately respond to each color field before the next field begins, preventing color breakup without requiring faster response elements.
3Reliability
If additional color fields are added to each frame to reduce color breakup, then color breakup and flicker are reduced, but the drive circuit complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the drive circuit to generate multiple color fields (red, green, blue) using the same basic circuit architecture and control logic. Rather than requiring separate dedicated circuits for each color field, a universal drive circuit structure is used that can be configured through timing control to produce the sequential color field sequence. This approach reduces drive circuit complexity compared to having independent circuits for each color field, while still achieving reduced color breakup through the additional color fields.
Data Source
AI summary
It is intended to provide a field sequential color display device capable of reducing the problem of saccadic color breakup. The color display device represents color images by depicting data of respective color images with a monochromatic display element in synchronism with sequential on-off switching to three color light sources of red, green and blue. Each display frame, which is the minimum cycle of sequential on-off switching of red, green and blue light sources to display any given color image, includes a red color field for displaying data of a red color image, a green color field for displaying data of a green color image and a blue color field for displaying data of a blue color image. In each green color field, at least the red light source or the blue light source is turned on and off in addition to the green light source.