Array Substrate With Unaligned Drain Through-Holes
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Solution Overview
Problem
The increasing display resolution in liquid crystal displays leads to a reduction in the area for placing photo spacers, causing them to sink into recesses on the array substrate and resulting in light leakage due to uneven support surfaces.
Innovation Solution
The array substrate design includes a source-drain metal layer, pixel electrode layer, and insulation layer with drain electrode through holes arranged such that they are unaligned in the column direction, reducing the overlapping area with photo spacers and alleviating light leakage issues even when the photo spacer deviates from its ideal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display resolution is increased, then display quality is improved, but the area for placing photo spacers is reduced
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning the drain through-holes in adjacent sub-pixels along the column direction. This asymmetric arrangement creates non-uniform spacing patterns that prevent photo spacers from sinking into recesses, thereby maintaining adequate placement area even as display resolution increases.
2Area of stationary object
If photo spacers are placed in smaller areas, then they may sink into recesses, but light leakage occurs due to uneven support surfaces
Solution Approach 1:
The patent applies local quality by creating different spacing conditions in different local areas. Specifically, the misaligned drain through-holes create varying horizontal distances between adjacent through-holes, ensuring that photo spacers are positioned in locations with adequate support in each local region, preventing sinking and light leakage.
3Ease of manufacture
If drain through-holes are aligned, then manufacturing is simpler, but photo spacers may overlap with through-holes causing light leakage
Solution Approach 1:
The patent deliberately introduces asymmetry by misaligning drain through-holes in adjacent sub-pixels along the column direction. This asymmetric positioning ensures that photo spacers do not overlap with through-holes, preventing light leakage while maintaining manufacturing feasibility through a systematic misalignment pattern.
Data Source
AI summary
An array substrate, display panel and display device. The array substrate includes: a source-drain metal layer, a pixel electrode layer, an insulation layer located between the source-drain metal layer and the pixel electrode layer, and a plurality of sub-pixels distributed in an array. Each sub-pixel corresponds to a drain electrode contained in source-drain metal layer, a pixel electrode contained in pixel electrode layer, and a drain through-hole defined in insulation layer. The pixel electrode is connected to the drain electrode via the drain through-hole. For any one row of the array, in a column direction, each drain electrode through hole is located at the same side of the sub-pixel 10 corresponding to the drain electrode through hole. The sub-pixels includes two adjacent support sub-pixels in a row direction, and the two drain through-holes respectively corresponding to the two adjacent support sub-pixels are unaligned in the column direction.