Array Substrate Black Shading Layer Light Leakage Prevention
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Solution Overview
Problem
In display panels, light leakage defects occur due to the deviation of the black matrix from its design position, leading to reduced yield and display brightness, as accurate alignment of substrates is challenging and prone to external impacts.
Innovation Solution
An array substrate design featuring a metal shielding layer, insulation layer, first black shading layer, and data line, where the first black shading layer overlaps with shielding metal lines, effectively shielding the gap between the data line and shielding metal lines, reducing light leakage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the black matrix is increased to prevent light leakage, then light leakage is reduced, but the display area is reduced and transmittance is lowered
Solution Approach 1:
The black matrix function is segmented into two parts: the original black matrix on the color film substrate and a new first black shading layer on the array substrate. This segmentation allows the light shielding function to be distributed, enabling prevention of light leakage without requiring the black matrix to be wider, thus preserving display area.
Solution Approach 2:
The invention adds a new dimension by placing the first black shading layer on the array substrate rather than only relying on the black matrix on the color film substrate. This dimensional change creates an additional light shielding barrier without increasing the width of existing components, thereby maintaining display area while preventing light leakage.
2Reliability
If the position of the black matrix is adjusted to align with shield metal wire and data line, then light leakage is prevented, but manufacturing alignment difficulty increases
Solution Approach 1:
The first black shading layer is formed on the array substrate before the color film substrate is assembled. This preliminary action allows the light shielding structure to be established in advance, reducing the alignment requirements during final assembly and lowering manufacturing precision demands.
Solution Approach 2:
The first black shading layer acts as an intermediary light shielding element between the shield metal wire/data line and the color film substrate. It provides light leakage prevention without requiring direct alignment with the shield metal wire or data line, thereby reducing manufacturing alignment difficulty.
3Ease of manufacture
If the black matrix position deviates from design position due to equipment accuracy limitations, then manufacturing is easier, but light leakage defects occur
Solution Approach 1:
The first black shading layer is designed with dimensions and positioning that provide a cushion or margin against alignment deviations. By anticipating potential position deviations during manufacturing, the structure ensures light leakage prevention even when the black matrix position deviates from the design position, thus maintaining reliability while preserving manufacturing ease.
4Reliability
If the black matrix is positioned to shield light leakage areas, then light leakage is prevented, but the black matrix obstructs display area
Solution Approach 1:
The light shielding function is segmented between the first black shading layer (which prevents light leakage without obstructing display area) and the original black matrix structure. This segmentation allows light leakage prevention while maintaining display brightness by positioning the primary shielding layer away from the display area.
Solution Approach 2:
The first black shading layer is positioned specifically in areas where light leakage occurs (near shield metal wire and data line) without extending into the display area. This local quality approach ensures light leakage prevention while preserving display brightness and area by applying shielding only where necessary.
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
This configuration completely shields the gap between the data line and shielding metal lines, preventing light leakage and increasing the yield of the display panel by ensuring the black matrix remains effective without obstructing the display area.
Implementation Method 1
an orthographic projection of the first black shading layer onto the first substrate partially overlaps with orthographic projections of the two first shielding metal lines arranged at the opposite sides of the data line onto the first substrate
Data Source
AI summary
An array substrate, including a first substrate, a metal shielding layer, a first black shading layer, and a data line; in which the metal shielding layer includes a first shielding metal lines, and an orthographic projection of the first black shading layer onto the first substrate partially overlaps with orthographic projections of the two first shielding metal lines arranged at the opposite sides of the data line onto the first substrate.