Cholesteric Liquid Crystal Partial Update Driving for Color Uniformity
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Solution Overview
Problem
Cholesteric liquid crystal displays face issues with color differences and non-uniform illumination during partial image updates due to sequential scanning of row circuit structures, leading to inconsistent color transitions across pixels.
Innovation Solution
A driving method and device that generate specific voltage signals to selectively update pixels while maintaining color differences, using high impedance and high frequency signals to prevent state changes in non-updated pixels, and ensuring voltage differences exceed a threshold for updated pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sequential scanning of row circuit structures is used to update images, then the liquid crystal driving unit can output row driving voltage and column driving voltage systematically, but color differences and non-uniform illumination occur during partial image updates
Solution Approach 1:
The patent divides the display panel into multiple zones corresponding to different row circuit structures. During partial image updates, only specific zones requiring updates are scanned and updated, while other zones maintain their current state. This segmentation allows selective updating of pixel blocks, preventing color differences and non-uniform illumination by avoiding unnecessary updates in regions that don't require changes.
2Productivity
If a whole row circuit structure is updated during partial image update, then the sequential scanning mechanism can operate, but multiple pixels in the same row are simultaneously updated causing color differences
Solution Approach 1:
The patent implements local quality control by applying different update strategies to different pixel blocks within the same row. Specifically, when performing partial image updates, the system identifies which pixel blocks need updates and applies voltage signals only to those specific blocks, while maintaining the original state of other blocks. This localized approach ensures that color transitions occur uniformly only where necessary, preventing color differences across the entire row.
3Reliability
If row driving voltage and column driving voltage are applied sequentially, then the addressing phase and evolution phase can be distinguished, but the preparation phase and non-addressing phase cause extended update time
Solution Approach 1:
The patent employs periodic action by implementing a optimized scanning sequence that periodically activates row circuit structures only when needed for partial updates. Instead of systematically scanning all rows through complete preparation, addressing, evolution, and non-addressing phases, the system periodically updates only the specific pixel blocks requiring changes. This periodic selective scanning reduces the overall update time while maintaining reliable phase control for the updated regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and device effectively maintain color uniformity and reduce illumination by selectively updating pixels, addressing color differences and non-uniformity in cholesteric liquid crystal displays.
Implementation Method 1
In the planar state, the cholesteric liquid crystal is regularly arranged and is capable of reflecting light with a specific wavelength
Implementation Method 2
In the focal-conic state, the cholesteric liquid crystal is irregularly arranged and scatters incident light
Data Source
AI summary
The present invention discloses a cholesteric liquid crystal device and a driving method for partially updating an image thereof. The cholesteric liquid crystal device and the driving method partially update the color differences of a part of the pixels in the row circuit structure and maintain the color differences of the other pixels in the row circuit structure.