LCD Subpixel Gate Line Connectivity for Polarity Inversion
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Solution Overview
Problem
Conventional data driving ICs for four color LCDs cause horizontal crosstalk and line flicker due to inability to perform polarity inversion for same colored subpixels, requiring costly modifications to achieve 2N×2 inversion.
Innovation Solution
A liquid crystal display configuration where switching elements are connected to gate and data lines in specific patterns to enable polarity inversion without modifying conventional data driving ICs, allowing for N×1 or 1×1 dot inversion and column inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional data driving ICs are used with four color subpixel configuration, then device complexity is reduced and cost is lowered, but horizontal crosstalk and line flicker occur due to inability to perform polarity inversion for same colored subpixels
Solution Approach 1:
The display panel is segmented into different subpixel types (red, green, blue, white) with specific connectivity patterns. Same-colored subpixels are strategically positioned and connected to different gate line pairs, allowing independent polarity control segments within the overall display structure.
Solution Approach 2:
The patent introduces asymmetric connectivity where subpixels in different positions (odd/even rows) are connected to different gate line pairs (G1-G2, G3-G4, etc.). This asymmetric arrangement enables different polarity inversion patterns for same-colored subpixels, eliminating horizontal crosstalk while maintaining compatibility with conventional data driving ICs.
2Object-affected harmful factors
If data driving IC is modified to perform 2N×2 inversion for polarity inversion of same colored subpixels, then horizontal crosstalk and line flicker are reduced, but manufacturing cost increases and yield decreases
Solution Approach 1:
The patent makes the display panel structure universal by designing it to work with conventional data driving ICs that perform standard N×1 inversion. The asymmetric gate line connectivity enables the same-colored subpixels to naturally achieve polarity inversion through the existing IC functionality, eliminating the need for custom-modified ICs and maintaining mass production compatibility.
Solution Approach 2:
The display panel structure itself provides the polarity inversion function through its asymmetric gate line connectivity design. The physical arrangement of subpixels and their connection to different gate line pairs automatically achieves the desired polarity alternation for same-colored subpixels without requiring external modification or complex control logic in the data driving IC.
3Device complexity
If conventional N×1 dot inversion is applied to four color LCD with even number of subpixels, then device complexity is maintained, but same colored subpixels cannot receive polarity inverted voltages
Solution Approach 1:
The patent transitions from one-dimensional row-based polarity inversion to two-dimensional gate line pair-based inversion. By utilizing multiple gate line pairs (G1-G2, G3-G4, G5-G6, etc.) with different connectivity patterns, the system achieves polarity inversion in the vertical dimension (different gate line pairs) while maintaining horizontal continuity, effectively solving the limitation of conventional N×1 inversion.
Solution Approach 2:
Instead of modifying the inversion pattern to accommodate same-colored subpixels, the patent inverts the approach by designing the connectivity structure to work with conventional inversion patterns. The asymmetric gate line connectivity naturally causes same-colored subpixels to receive inverted polarities through the standard N×1 inversion process, achieving the desired effect through structural inversion rather than control logic inversion.
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
Enables polarity inversion for same colored subpixels, reducing horizontal crosstalk and line flicker while utilizing commercially available data driving ICs, thus maintaining cost-effectiveness and yield.
Implementation Method 1
a liquid crystal layer with dielectric anisotropy disposed therebetween, displays desired images by adjusting the strength of the electric field applied to the liquid crystal layer to control the transmittance of light
Data Source
AI summary
A liquid crystal display includes a plurality of subpixels respectively having switching elements and arranged in a matrix, a plurality of gate lines connected to the subpixels via the switching elements and transmitting a gate signal for turning on or off the switching elements, and a plurality of data lines connected to the subpixels via the switching elements and transmitting a data voltage. The respective subpixels are located in areas defined by two adjacent gate lines and two adjacent data lines, which are uniquely connected to a pair of gate line and data line, and at least one of the subpixels is connected to the different gate lines or the data line positioned at opposite side with respect to the other subpixel of the same row. In this case, a pair of subpixels adjacent above and below are connected to the gate line therebetween or the gate lines positioned at opposite side each other. In this way, any inversions for each color can be performed without changing conventional driving ICs.