Backlight Driving Method for Color Field Sequential Displays
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Solution Overview
Problem
Color field sequential displays suffer from color break-up and flicker, leading to distorted images and potential dizziness in observers due to incorrect projection of RGB light components on the retina.
Innovation Solution
A backlight driving method that divides frames into subframes and alternates the lighting order of red, green, and blue light sources, optionally incorporating a compensational light source, to reduce color break-up and flicker by increasing the frequency of the green light source and adding additional subframes for white or mixed light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional color field sequential driving method is used, then higher resolution and space saving are achieved, but color break-up occurs and image quality deteriorates
Solution Approach 1:
The patent divides each frame into multiple subframes (first subframe, second subframe, third subframe, fourth subframe) and controls different light sources in each subframe. This segmentation allows precise control of light emission timing and sequence, preventing color break-up while maintaining high resolution by ensuring each pixel receives correct color information in the proper temporal sequence.
Solution Approach 2:
The patent implements a periodic lighting sequence where red, green, and blue light sources are activated in alternating subframes within each frame. This periodic action with specific timing (R-G-B-R pattern) ensures that color information is correctly projected onto the retina without distortion, resolving the color break-up issue while preserving the resolution benefits of field sequential driving.
2Device complexity
If conventional color field sequential driving method is used, then fewer driving circuit chips are used, but flicker and color break-up occur causing observer discomfort
Solution Approach 1:
The patent segments the driving sequence into four distinct subframes per frame, with each subframe controlling a specific light source timing. This segmentation enables precise temporal control that eliminates flicker and color break-up without requiring additional driving circuit chips, as the complexity is managed through software control sequences rather than hardware additions.
Solution Approach 2:
The patent changes the temporal parameters of light emission by implementing a specific subframe-based timing sequence (R-G-B-R pattern) rather than conventional continuous or simple sequential driving. This parameter change in the lighting timeline eliminates harmful flicker and color distortion effects while maintaining the simplicity of the driving circuit architecture.
3Device complexity
If green light source is lit once per frame, then simpler control is achieved, but flicker is more noticeable and image quality suffers
Solution Approach 1:
The patent segments the green light source activation into multiple subframes (second subframe and fourth subframe) within each frame rather than a single activation. This segmentation increases the duty cycle of the green light source, reducing flicker perception and improving visual stability while maintaining relatively simple control logic through the established subframe structure.
Solution Approach 2:
The patent ensures continuous and smooth transition of light sources across subframes by implementing a structured sequence (R-G-B-R) that maintains temporal continuity. The green light source is activated in the second subframe and potentially fourth subframe, creating a continuous useful action that reduces flicker and improves visual stability without complicating the control system.
Data Source
AI summary
A backlight driving method, which provides three kinds of light sources comprising a red light source, a blue light source, and a green light source. The driving method includes dividing a frame into four sub-frames, and lighting the green light sources twice during two sub-frames respectively, dividing the first frame and the second frame into four sub-frames respectively, lighting the four light sources in the four sub-frames in a first lighting order during the first frame, and lighting the four light sources in the four sub-frames using a second lighting order during the second frame, wherein the first order is different from the second order.