Display Device Subframe Timing for Color Breakup Reduction
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing color breakup, particularly at low frame rates, due to limitations in increasing the writing cycle and light emission time of color sources.
Innovation Solution
A display device configuration with a light source comprising red, green, and blue light sources, where the display period is divided into six subframe periods, allowing for alternating writing and lighting periods to optimize the emission timing of color components across pixel rows, thereby increasing the writing cycle and reducing color breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the frame rate is increased to reduce color breakup, then the color breakup is reduced, but the writing cycle becomes shorter and it becomes difficult to simply increase the writing cycle
Solution Approach 1:
The display period is divided into six subframe periods, with each subframe period containing a writing period and a lighting period. This segmentation allows the writing cycle to be extended across multiple subframes while maintaining adequate light emission time, thereby reducing color breakup without sacrificing writing efficiency.
Solution Approach 2:
The patent implements periodic writing and lighting actions across six subframe periods. By alternating between writing periods (where pixel data is updated) and lighting periods (where light sources emit), the system achieves both extended writing cycle and sufficient light emission, resolving the contradiction between reducing color breakup and maintaining writing speed.
2Object-affected harmful factors
If the light emission time of each color source is increased to reduce color breakup, then the color breakup is reduced, but the frame rate decreases
Solution Approach 1:
The frame period is segmented into six subframe periods, each handling a specific color component. This allows the light emission time for each color to be optimized independently within its designated subframe, reducing color breakup while maintaining the overall frame rate through efficient time-division multiplexing.
Solution Approach 2:
Each color source (red, green, blue) emits light periodically during its assigned lighting period within the six-subframe cycle. This periodic action ensures sufficient light emission time for each color to reduce color breakup, while the alternating pattern across six subframes maintains the overall frame rate.
3Object-affected harmful factors
If the writing cycle is increased to reduce color breakup, then the color breakup is reduced, but the productivity of pixel writing decreases
Solution Approach 1:
The writing process is segmented across six subframe periods, with each subframe dedicated to writing a specific color component to specific pixel rows. This segmentation extends the effective writing cycle for each color, reducing color breakup, while the parallel processing of different color components across subframes maintains overall writing productivity.
Solution Approach 2:
The writing operation follows a periodic pattern across six subframes, systematically updating pixel data for different color components in sequence. This periodic writing approach allows each color channel to have an extended effective writing cycle, reducing color breakup, while the cumulative writing across all six subframes maintains high overall productivity.
Data Source
AI summary
A display device includes: a display panel including pixel rows to which line images are written; and a red, a green, and a blue light source. A display period of a frame image includes six subframe periods, each including a writing period and a lighting period. The line image of a color component corresponding to a combination of light emitted during the lighting period of a preceding period of two consecutive subframe periods, and light emitted during the lighting period of a subsequent period is written during the writing period of the preceding period. The subframe periods includes a first and a second subframe period provided alternately and consecutively, the first subframe period includes the writing period during which the line image is written to a first pixel row, and the second subframe period includes the writing period during which the line image is written to a second pixel row.