Liquid Crystal Display Column Inversion Pixel Structure
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Solution Overview
Problem
Liquid crystal display devices face issues with flicker generation and cross-talk due to polarity inversions, which lead to discomfort for users and increased power consumption, particularly with frame inversion, necessitating an improved pixel structure and driving method.
Innovation Solution
The proposed solution involves a driving circuit with data lines of opposite polarities for adjacent lines in one frame period and combining two pixel areas to form a pixel unit, allowing adjacent pixel units to operate with opposite polarities, utilizing column inversion to reduce cross-talk and power consumption while minimizing flickers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame inversion is applied to avoid crystal molecule damage, then polarity alternation is achieved, but flickers are generated making human eyes uncomfortable
Solution Approach 1:
The patent divides the display into multiple pixel units, where each pixel unit contains multiple pixel areas that can be independently controlled. By segmenting the polarity inversion at the pixel unit level rather than frame level, the invention reduces flicker while protecting crystal molecules.
Solution Approach 2:
The patent implements different polarity inversion strategies for different pixel units. Adjacent pixel units can have different inversion timing and polarity patterns, allowing local optimization that reduces overall flicker while maintaining crystal molecule protection.
2Object-generated harmful factors
If dot inversion is used to reduce cross talk, then adjacent pixel interference is minimized, but power consumption increases
Solution Approach 1:
The patent segments the display into pixel units with multiple pixel areas, allowing selective polarity inversion. This segmentation enables reduced cross-talk through localized inversion while minimizing the overall power consumption compared to full-dot inversion.
Solution Approach 2:
Instead of inverting all pixels (excessive action), the patent applies partial inversion only to adjacent pixel areas within pixel units. This partial action reduces cross-talk sufficiently while significantly lowering power consumption compared to complete dot inversion.
3Duration of action of stationary object
If polarity inversion is frequently applied to protect crystal molecules, then display longevity is improved, but flicker frequency increases
Solution Approach 1:
The patent implements dynamic polarity control where adjacent pixel units can switch polarities at different rates and patterns. This dynamic approach allows frequent protection of crystal molecules while distributing flicker effects across multiple pixel units, reducing perceived flicker frequency.
Solution Approach 2:
Different pixel units can have different polarity inversion patterns tailored to their specific requirements. This local quality approach allows optimized protection of crystal molecules in each region while minimizing overall flicker frequency through diverse inversion timing.
Data Source
AI summary
A method for driving a liquid crystal display device includes the following steps. A driving circuit and a display unit are provided, the driving circuit comprising a plurality of data lines for transferring data voltages to drive the display unit, wherein each adjacent two of the data lines are supplied with voltages of opposite polarities, and all the data lines in one frame period are supplied with voltages of the same polarity. Two adjacent pixel areas are combined to form one pixel unit, wherein the two adjacent pixel areas are supplied with the same polarity, and the adjacent two pixel units are supplied with opposite polarities.