Pixel Array Auxiliary Electrode Pattern for Aperture Ratio
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Solution Overview
Problem
The aperture ratio of liquid crystal display (LCD) pixel structures is limited due to the presence of capacitor electrode lines, which reduces the effective light transmission area.
Innovation Solution
The introduction of an auxiliary electrode pattern with a connecting portion and branch portions, arranged in an H-shape, is placed underneath the gap between pixel electrodes, preventing light leakage and acting as a capacitor electrode, thereby increasing the aperture ratio while minimizing the layout area compared to conventional capacitor electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor electrode line is disposed in each pixel structure to hold the operating voltage, then the storage capacitor function is achieved, but the aperture ratio of the pixel structure is reduced
Solution Approach 1:
The pixel structure is divided into multiple sub-pixels (first pixel electrode and second pixel electrode), and the capacitor electrode line is segmented into corresponding segments. Each segment serves its respective sub-pixel, allowing the capacitor function to be distributed across multiple smaller areas rather than requiring a single large capacitor electrode line, thus reducing the overall impact on aperture ratio
Solution Approach 2:
The invention transitions from a conventional linear capacitor electrode line arrangement to a two-dimensional auxiliary electrode pattern with connecting and branch portions. This spatial reconfiguration allows the capacitor electrodes to be distributed more efficiently across the pixel structure, reducing the linear space requirement and minimizing the blockage of light transmission paths
2Object-affected harmful factors
If the auxiliary electrode pattern is placed underneath the gap between pixel electrodes, then light leakage is prevented, but additional layout area is required
Solution Approach 1:
The auxiliary electrode pattern serves dual functions: it acts as a light-shielding structure to prevent light leakage through the gap between pixel electrodes, and simultaneously functions as the capacitor electrode to hold operating voltage. This self-service approach eliminates the need for separate dedicated capacitor electrode lines, as the same auxiliary electrodes perform both light shielding and voltage storage functions
Solution Approach 2:
The light-shielding function and capacitor electrode function are merged into a single auxiliary electrode pattern. The connecting portion and branch portions of the auxiliary electrode pattern simultaneously block light leakage and provide capacitance for voltage storage, reducing the total layout area compared to having separate structures for each function
Data Source
AI summary
A pixel array includes pixel sets. Each pixel set includes a first and second scan lines arranged in parallel on a substrate, a data line not parallel to the first and second scan lines, a first active device electrically connecting the first scan line and the data line, a second active device electrically connecting the second scan line and the data line, a first pixel electrode electrically connecting the first active device, a second pixel electrode electrically connecting the second active device, and an auxiliary electrode pattern that includes a connecting portion and a first and second branch portions. A gap is between the first and second pixel electrodes. The connecting portion underneath the gap between the first and second pixel electrodes partially overlaps the first and second pixel electrodes. The first and second branch portions connect the connecting portion and partially overlap the first and second pixel electrodes, respectively.