Array Substrate Bus Layout to Reduce Bright Metal Edge
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Solution Overview
Problem
In display technology, the use of bulk metals in non-display regions of array substrates leads to light reflection and a bright metal edge, affecting the display effect, especially in narrow-border or borderless designs.
Innovation Solution
The array substrate design includes a light shielding layer and a common electrode bus with a specific distribution density and structure, where the first common electrode bus has a lower distribution density in the first peripheral region and a higher distribution density in the second peripheral region, with a block-shaped metal portion in the second region and strip-shaped metal portions with slits in the first region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bulk metals are provided in non-display region of array substrate, then electrical connection and signal transmission are ensured, but light reflection occurs causing bright metal edge that affects display effect
Solution Approach 1:
The common electrode bus is divided into multiple segments with different distribution densities. The first peripheral region has a lower distribution density while the second peripheral region has a higher distribution density, creating segmented zones that balance electrical connection needs with light reflection reduction
Solution Approach 2:
Different regions of the common electrode bus are assigned different local qualities in terms of metal distribution density. The first peripheral region uses a sparser metal arrangement to reduce light reflection, while the second peripheral region uses a denser arrangement to ensure adequate electrical connection, applying local quality optimization to different zones
2Reliability
If metal distribution density is increased to ensure electrical connection, then reliability improves, but light reflection area increases causing more severe bright metal edge
Solution Approach 1:
The patent applies different metal distribution densities to different local regions. The first peripheral region has a lower distribution density to minimize reflection area, while the second peripheral region has a higher distribution density to ensure electrical connection reliability, optimizing both parameters through spatially varying local quality
Solution Approach 2:
The common electrode bus structure is segmented into distinct regions with different metal densities. This segmentation allows the system to satisfy electrical connection requirements in critical areas while minimizing light reflection in visible peripheral areas, resolving the contradiction between reliability and reflection area
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 design reduces the reflection area of the common electrode bus, effectively minimizing the bright metal edge issue and enhancing the display effect by reducing light reflection in non-display regions.
Implementation Method 1
a light shielding layer located on the first surface of the base substrate, an orthographic projection of the light shielding layer on the base substrate is located in the peripheral region
Data Source
AI summary
An array substrate includes: a base substrate, a light shielding layer on a first surface of the base substrate, and a plurality of pixel units and a first common electrode bus on a second surface of the base substrate. The base substrate includes a display region, first and second peripheral regions. Orthographic projections of the pixel units on the base substrate are arranged in an array in the display region. At least part of an orthographic projection of the light shielding layer and at least part of an orthographic projection of the first common electrode bus on the base substrate are in the second peripheral region, and the first common electrode bus is electrically connected to the common electrode included in at least one pixel unit. A distribution density of the first common electrode bus in the first peripheral region is smaller than that in the second peripheral region.