Display Substrate Layout With Light Shielding for Stripe Defects
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Solution Overview
Problem
Liquid crystal display panels using the HADS display mode face challenges when applied to large-sized products due to high charging rates and complex organic film processes, which affect transmittance and lead to horizontal stripe defects.
Innovation Solution
A display substrate design with gate lines on one side of data lines and a light shielding portion in the same layer as the data lines, overlapping with a semiconductor portion to shield it from backlight irradiation, reducing capacitance effects and eliminating horizontal stripe defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If common electrodes cover data lines in HADS display mode, then transmittance is improved, but charging rate becomes difficult to maintain for large-sized products
Solution Approach 1:
The common electrode is segmented into multiple independent common electrode regions arranged in matrix along the first direction, allowing selective coverage of different data line regions. This segmentation enables the light shielding portion to cover only specific semiconductor portions while maintaining transmittance in other areas, thus resolving the contradiction between transmittance and charging rate.
Solution Approach 2:
Light shielding portions are selectively positioned to cover only the semiconductor portions that generate horizontal stripe defects, while leaving other semiconductor portions uncovered. This local quality approach maintains high transmittance in non-defect areas while eliminating stripe defects in specific regions, resolving the contradiction between overall transmittance and local defect elimination.
2Reliability
If light shielding portion covers semiconductor portion, then horizontal stripe defects are eliminated, but transmittance may be reduced
Solution Approach 1:
The common electrode is divided into multiple independent regions that can be selectively activated. Light shielding portions are positioned within specific common electrode regions to cover only the semiconductor portions causing horizontal stripe defects. This segmentation allows transmittance to be maintained in areas without defects while eliminating stripe defects in specific regions.
Solution Approach 2:
Instead of uniformly covering all semiconductor portions, light shielding portions are selectively placed only where horizontal stripe defects occur. The first common electrode region has different light shielding characteristics compared to the second common electrode region, achieving local defect elimination while maintaining overall high transmittance.
3Device complexity
If gate lines are positioned on one side of data lines, then manufacturing complexity is reduced, but capacitance effects increase
Solution Approach 1:
The gate lines are extracted from the conventional crossed configuration and positioned exclusively on one side of the data lines. This extraction simplifies the manufacturing process by reducing the number of crossing points and alignment requirements, while the light shielding portions are strategically placed to minimize capacitance effects between the gate lines and data lines.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design maintains high transmittance and reduces process complexity by using a simpler manufacturing process while effectively addressing horizontal stripe defects and charging rate issues.
Implementation Method 1
a light shielding portion, disposed in the same layer as the plurality of data lines, and in the direction perpendicular to the base substrate, at least a part of the semiconductor portion is overlapped with the light shielding portion
Data Source
Figure 1~3A
Figure 3B~3C
Figure 4~5
AI summary
A display substrate and a display apparatus. The display substrate comprises a base substrate (01), data lines (100), gate lines (200), a semiconductor layer (300), and transistors (400). The semiconductor layer (300) and the gate lines (200) are stacked, and the semiconductor layer (300) is located between a film layer where the gate lines (200) are located and a film layer where the data lines (100) are located. Each transistor (400) comprises a gate electrode (403), an active layer (404), a first electrode (401) and a second electrode (402), the gate electrode (403) is electrically connected to a corresponding gate line (200), the first electrode (401) is electrically connected to a corresponding data line (100), and the semiconductor layer (300) comprises the active layer. The gate lines (200) are located on the side of the data lines (100) distant from the base substrate (01), the gate electrodes (403) are arranged on the same layer as the data lines (100), the semiconductor layer (300) comprises semiconductor portions (310) on which the gate lines (200) are stacked, and the semiconductor portions (310) are spaced apart from the active layers (404). The display substrate further comprises light-shielding portions (500) arranged on the same layer as the data lines (100), and in the direction perpendicular to the base substrate (01), at least some of the semiconductor portions (310) overlap with the light-shielding portions (500) so that at least some of the semiconductor portions (310) on which the gate lines (200) are stacked are shielded by means of the light-shielding portions (500) arranged on the same layer as the data lines (100), thereby facilitating elimination of horizontal stripe defects.