LCD Panel Floating Lines for Uniform Sealant Thickness
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Solution Overview
Problem
LCD panels face issues with curtain mura due to varying thickness of sealant caused by different thicknesses of signal lines and common circuit layers, leading to electrostatic discharge (ESD) at contact points.
Innovation Solution
The design includes an active device array substrate with signal lines and a common circuit layer of uniform thickness, using floating lines that match the thickness of the signal lines and common circuit layer, eliminating the need for contacts that cause ESD, and ensuring a uniform sealant thickness to prevent mura.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines and common circuit layer have different thicknesses, then electrical connection is achieved, but sealant thickness becomes non-uniform causing curtain mura
Solution Approach 1:
The patent applies local quality by making the signal lines in the peripheral area have the same thickness as the common circuit layer, while signal lines in the display area can have different thickness. This localized thickness adjustment ensures uniform sealant thickness in the peripheral area where sealant is applied, eliminating curtain mura while maintaining electrical connection functionality.
2Reliability
If contacts are used to electrically connect metal film layers, then electrical connection is achieved, but electrostatic discharge (ESD) occurs at contact positions
Solution Approach 1:
The patent extracts and eliminates the contact structures from the design. Instead of using contacts to electrically connect metal film layers, the invention uses through-holes that extend through the insulating layer to provide electrical connection between signal lines and the common circuit layer, thereby removing the source of ESD problems while maintaining electrical connectivity.
3Reliability
If signal lines extend to peripheral area, then electrical connection is maintained, but sealant thickness becomes non-uniform
Solution Approach 1:
The patent applies local quality by creating a specific thickness configuration for signal lines in the peripheral area. The signal lines are designed to have the same thickness as the common circuit layer in the peripheral area where sealant is applied, ensuring uniform cell gap. This localized thickness control allows signal lines to extend to the peripheral area for electrical connection while preventing sealant thickness non-uniformity.
Data Source
AI summary
A liquid crystal display panel including an active device array substrate, a second substrate, a sealant, and a liquid crystal layer is provided. The active device array substrate has a display area and a peripheral area surrounding the display area, and includes a first substrate, pixels, signal lines, floating lines, and a common circuit layer. The signal lines are electrically connected with the pixels. The floating lines are disposed in fan-out areas of the peripheral area. Each of the floating lines is aligned with one of the signal lines respectively. The common circuit layer is disposed on an area of the peripheral area outside the fan-out areas. An overall thickness of the floating line and the signal line aligned therewith is equal to a thickness of the common circuit layer. The sealant covers the floating lines, a part of the signal lines and the common circuit layer.