Pixel Structure Row Inversion Reduces Horizontal Crosstalk
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Solution Overview
Problem
Traditional liquid crystal display panels using WRGB technology experience significant horizontal crosstalk due to the alignment of sub pixels, which affects the image display effect by causing unwanted coupling with the common electrode.
Innovation Solution
A pixel structure with a row inversion driving mode is implemented, where the polarities of sub pixels in adjacent columns are opposite, ensuring that sub pixels of the same color in the same row cancel each other out, reducing horizontal crosstalk by aligning white, red, green, and blue sub pixels sequentially from left to right.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub pixels are aligned in the same order in each pixel unit (WRGB sequence), then the manufacturing process is simplified and consistent, but horizontal crosstalk occurs due to cumulative polarity coupling with the common electrode
Solution Approach 1:
The patent introduces asymmetry in the polarity arrangement of sub pixels. Specifically, adjacent pixel units have opposite polarity sequences (e.g., + - + - vs. - + - +), breaking the symmetric cumulative coupling pattern that causes horizontal crosstalk. This asymmetric arrangement allows the electric fields from adjacent sub pixels to cancel each other out, eliminating the harmful coupling effect while maintaining manufacturing simplicity.
Solution Approach 2:
The patent applies inversion by reversing the polarity sequence in alternating pixel units. Instead of all pixel units having the same polarity arrangement (+ - + -), every other pixel unit uses the inverted sequence (- + - +). This inversion strategy causes the electric fields from adjacent pixel units to oppose and cancel each other, effectively reducing horizontal crosstalk while preserving the consistent WRGB alignment order for ease of manufacture.
2Ease of operation
If all red sub pixels in a row have the same polarity, then the driving control is simplified, but the common electrode is pulled causing horizontal crosstalk
Solution Approach 1:
The patent inverts the polarity assignment for red sub pixels in alternating pixel units. In pixel units with even indices, red sub pixels have positive polarity, while in pixel units with odd indices, red sub pixels have negative polarity. This inversion pattern ensures that the electric fields from adjacent red sub pixels cancel each other out, preventing common electrode pulling and horizontal crosstalk, while still allowing simplified row-inversion driving control.
Solution Approach 2:
The patent uses the electric field from one red sub pixel as a counterweight to offset the field from its neighbor. By assigning opposite polarities to red sub pixels in adjacent pixel units, the electric fields act as counterbalancing forces that neutralize each other's effect on the common electrode, preventing the cumulative pulling effect that would otherwise occur.
Data Source
AI summary
The present invention provides a pixel structure and a liquid crystal display panel. The pixel structure comprises a plurality of pixel units arranged in array, and each pixel unit comprises a white sub pixel (W), a red sub pixel (R), a green sub pixel (G) and a blue sub pixel (B); in respective pixel units, the white sub pixel (W), the red sub pixel (R), the green sub pixel (G) and the blue sub pixel (B) are aligned with the same order along a horizontal direction; a driving mode of the pixel structure is row inversion; as showing an image of the same frame, in pixel units of each column, polarities of sub pixels of every two adjacent columns are opposite; in the sub pixels of every two adjacent columns, polarities of sub pixels of the same color are opposite to make that polarities of every two adjacent sub pixels of the same color in the pixel units of the same row are opposite. It is capable of reducing the horizontal crosstalk of the sub pixels of the same color in the pixel units of the same row to ensure the image display effect.