Pixel Drive Circuit for Display Panel Color Shift
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Solution Overview
Problem
Large-sized display devices using vertical alignment mode suffer from significant color shift at large view angles due to differences in color resist materials and divided voltages, affecting panel quality and customer satisfaction.
Innovation Solution
A pixel drive circuit design with a scan line group and data line group that includes a sharing line group, dividing each sub pixel area into four domains and using different voltage division combinations for red, green, and blue pixels to adjust voltage magnitudes, thereby regulating color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a multi-domain pixel design method is adopted to reduce color shift, then viewing angle performance is improved, but device complexity increases due to multiple pixel electrodes and domain structures
Solution Approach 1:
The pixel electrode is divided into multiple domains (first domain, second domain, third domain, fourth domain) with different orientation directions. Each domain has liquid crystal molecules oriented at different angles, allowing different viewing angle characteristics to be achieved in different regions of the same pixel, thus reducing overall color shift while maintaining a relatively simple single-electrode structure.
Solution Approach 2:
Different domains within the pixel electrode are assigned different liquid crystal orientation characteristics. The first and third domains have one orientation direction while the second and fourth domains have another orientation direction perpendicular to the first. This local differentiation allows each domain to contribute differently to brightness at various viewing angles, achieving color shift reduction through localized optical properties.
2Ease of manufacture
If sub pixel electrodes are designed to contribute differently to brightness at various viewing angles, then viewing angle performance is improved, but manufacturing precision requirements increase due to complex voltage division and color resist material differences
Solution Approach 1:
The patent applies different voltage magnitudes to different domains through the voltage division circuit. By changing the voltage parameter applied to each domain, the brightness contribution of each domain at various viewing angles is controlled. This allows precise adjustment of the optical output without requiring complex material differences, reducing manufacturing precision requirements.
Solution Approach 2:
The pixel electrode structure serves multiple functions: it acts as both the main pixel electrode and contains multiple sub-domain electrodes with different orientations within the same physical structure. This multi-functional design allows a single electrode structure to achieve both the simplicity of a conventional pixel and the complex viewing angle control of multi-domain designs, reducing manufacturing complexity.
Data Source
AI summary
A pixel drive circuit and a display panel are provided. According to the pixel drive circuit, a first data line and a first sharing line form a first sub pixel area, a second data line and a second sharing line form a second sub pixel area, and a third data line and a third sharing line form a third sub pixel area. The first sub pixel area, the second sub pixel area and the third sub pixel area share one scan line. The first sharing line of the first sub pixel area is connected in series with the third sharing line of the third sub pixel area.