Array Substrate Electrode Width Variation for LCD Uniformity
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Solution Overview
Problem
Existing display panel fabrication processes often result in critical dimension (CD) bias, leading to non-uniform display brightness due to inconsistent electrode strip widths and distances, affecting the uniformity of the electric field and light transmission in liquid crystal displays (LCDs).
Innovation Solution
The array substrate features alternately arranged first and second electrode strips with varying widths along their lengths, maintaining consistent distances between strips in different directions, which helps mitigate CD bias and ensures uniform display brightness by compensating for fabrication inaccuracies through domain-specific distance adjustments and segment-based width variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fabrication processes are used to form electrode strips, then manufacturing simplicity is maintained, but critical dimension bias occurs leading to non-uniform display brightness
Solution Approach 1:
The electrode strips are designed with different width characteristics in different regions. Specifically, the first electrode strips have widths that vary along their length direction, while the second electrode strips have different width variations. This local differentiation compensates for CD bias in specific areas, improving overall width uniformity without requiring complete redesign of the entire electrode system.
Solution Approach 2:
The patent introduces asymmetric width variations between the first and second electrode strips. The first electrode strips have a base value M with deviation range, while the second electrode strips have a base value N with different deviation range. This asymmetric design allows compensation for fabrication inaccuracies by creating intentional width differences that counteract the systematic CD bias.
2Illumination intensity
If electrode strips with varying widths are used to compensate for CD bias, then display brightness uniformity improves, but fabrication precision requirements increase
Solution Approach 1:
The patent changes the width parameter of electrode strips along their length direction. The first electrode strips have widths varying within M±deviation range, while second electrode strips have widths varying within N±deviation range. This parameter variation is designed to compensate for CD bias and improve display brightness uniformity across different regions of the display panel.
Solution Approach 2:
The electrode strips are conceptually divided into segments along their length direction, with each segment having controlled width variations. This segmentation allows independent optimization of width characteristics in different regions to compensate for spatially varying CD bias effects.
3Stability of the object's composition
If alternating arrangement of first and second electrode strips is implemented, then electric field uniformity improves, but device structure complexity increases
Solution Approach 1:
The patent employs asymmetric width design between first and second electrode strips in the alternating arrangement. The first electrode strips have base width M with certain deviation, while second electrode strips have base width N with different deviation. This asymmetric configuration creates more uniform electric field distribution by compensating for the alternating pattern's inherent non-uniformity.
Data Source
AI summary
Array substrate, display panel, and display device, and their fabrication methods are provided. An array substrate includes a plurality of subpixels, each including a first electrode and a second electrode, electrically isolated from one another, on a substrate. The first electrode includes a plurality of electrically connected first electrode strips. The second electrode includes a plurality electrically connected second electrode strips alternately arranged with the first electrode strips. A first distance along a first direction at any position between one first electrode strip and a first neighboring second electrode strip is substantially same. Along a length direction of the first electrode strips, a first width of each first electrode strip has a varying value at a different position.