Pixel Electrode Layout for LCD Transmittance and Color Shift
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Solution Overview
Problem
Current liquid crystal displays experience color shift and reduced transmittance due to the design of common electrode lines, which occupy display areas and cause electrical offsets under illumination.
Innovation Solution
A pixel structure with a first metal layer, a transparent electrode layer, and a second metal layer, where the second common electrode lines are parallel to the gate line, and the first and second common electrode lines are staggered, allowing the transparent electrode layer to be placed in spaces formed by the metal lines, thereby increasing transmittance without overlapping with data lines in non-transmissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the second common electrode lines are arranged perpendicular to the gate line and extend through all pixel areas, then the color shift at large viewing angles is improved, but the transmittance of the pixels decreases due to occupation of display areas
Solution Approach 1:
The pixel structure is divided into display area and non-display area, with different electrode line arrangements in each region. The second common electrode lines are interrupted at the pixel non-transmissive area boundary, allowing them to extend through the display area for color shift correction while avoiding occupation of the non-display area, thus maintaining high transmittance.
Solution Approach 2:
Different regions of the pixel structure have different electrode line configurations. In the display area, the second common electrode lines are arranged perpendicular to the gate line to correct color shift. In the non-display area, these lines are interrupted and reconfigured to be parallel to the gate line, optimizing each region's function locally.
2Reliability
If the second common electrode lines extend through all pixel areas, then the electrical offset due to illumination is reduced, but the aperture ratio decreases due to occupation of display areas
Solution Approach 1:
The electrode line configuration is segmented into display area and non-display area. The second common electrode lines extend through the display area to provide electrical offset stability, but are interrupted at the boundary and reconfigured in the non-display area, preventing aperture ratio reduction.
Solution Approach 2:
The second common electrode lines change direction at the pixel non-transmissive area boundary. They transition from being perpendicular to the gate line in the display area to being parallel to the gate line in the non-display area, utilizing dimensional change to optimize both electrical stability and aperture ratio.
3Area of stationary object
If the transparent electrode layer is placed in spaces formed by perpendicular metal lines, then the transmittance is improved, but the data lines may overlap with the transparent electrode layer in non-transmissive areas causing manufacturing issues
Solution Approach 1:
The metal line arrangement is optimized locally in different regions. In the display area, the first and second common electrode lines are perpendicular to maximize transparent electrode layer placement and transmittance. In the non-display area, the lines are parallel and positioned to avoid overlapping with the transparent electrode layer, ensuring ease of manufacture.
Solution Approach 2:
The second common electrode lines change their orientation from perpendicular to parallel at the pixel non-transmissive area boundary. This dimensional change in line arrangement ensures that the transparent electrode layer can be placed in spaces in the display area without overlapping with data lines in the non-display area.
Data Source
AI summary
A pixel structure and a display device are provided. The pixel structure includes a first metal layer, a transparent electrode layer, and a second metal layer. The first metal layer includes a plurality of first metal lines, a plurality of second metal lines, and a third metal line. The transparent electrode layer is disposed in a space formed by the first metal layer. The second metal layer is disposed over the first metal layer and the transparent electrode layer and disposed on a side of the transparent electrode layer.