Touch Control Electrode Overlap Design for Display Panel Yield
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Solution Overview
Problem
The existing touch screen technologies face issues with metal residues and insulation layer breakage due to over-etching and stress concentration in the transition regions of touch control electrodes, leading to reduced yield and increased risk of short circuits in display panels.
Innovation Solution
A display panel design that includes a touch control device with a bridge layer, insulation layer, and touch control electrode layer, where the touch control electrode portions overlap and extend beyond the bridge electrodes, reducing the need for etching in tilt angle regions and minimizing metal residue formation, thereby enhancing the structural integrity of the insulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch control electrodes are introduced to realize touch function, then touch capability is improved, but metal residues are generated affecting product yield
Solution Approach 1:
The touch control electrode is divided into two separate layers: a bridge electrode layer and a touch control electrode layer. The bridge electrodes provide structural support and connection, while the touch control electrodes enable touch functionality. This segmentation allows each layer to be optimized independently, reducing metal residue issues while maintaining both structural integrity and touch capability.
Solution Approach 2:
An insulation layer is introduced as an intermediary between the bridge electrode layer and the touch control electrode layer. This insulation layer prevents direct contact between metal components, reduces metal residue formation, and eliminates the risk of short circuits, thereby improving product yield while maintaining touch functionality.
2Manufacturing precision
If etching process is used to form touch control electrodes, then electrode pattern is achieved, but over-etching causes insulation layer breakage
Solution Approach 1:
The bridge electrode layer is formed first with sufficient thickness and structural integrity, creating a stable foundation before the etching process for the touch control electrodes. This preliminary action ensures that the insulation layer is not compromised during subsequent etching operations, as the bridge electrodes provide structural support that prevents over-etching damage.
Solution Approach 2:
The insulation layer serves as a protective intermediary between the bridge electrodes and the etching process. By positioning the insulation layer between these components, it absorbs and distributes the stress from the etching process, preventing direct damage to the bridge electrodes and maintaining overall structural integrity.
3Reliability
If touch control electrode overlaps bridge electrode, then electrical connection is achieved, but stress concentration causes insulation layer fracture
Solution Approach 1:
The overlap region between the touch control electrode and bridge electrode is designed with specific local characteristics: the insulation layer in this region is optimized to distribute stress evenly, and the electrode dimensions are carefully controlled to minimize stress concentration. This local quality enhancement prevents insulation layer fracture while maintaining reliable electrical connection.
Solution Approach 2:
The insulation layer is designed with sufficient thickness and mechanical strength in the overlap regions before the electrodes are assembled. This beforehand cushioning provides a stress-absorbing buffer that prevents fracture during assembly and operation, ensuring both electrical connection reliability and structural integrity.
Data Source
AI summary
A display panel and a display apparatus are provided in the present disclosure. The display panel includes a substrate, a display device disposed on the substrate, and a touch control device, disposed on a side of the display device away from the substrate. The touch control device includes a bridge layer, an insulation layer, and a touch control electrode layer; the bridge layer includes a plurality of bridge electrodes; and the touch control electrode layer includes touch control electrodes. A touch control electrode includes a touch control electrode portion, where along a direction perpendicular to a plane of the display panel, the touch control electrode portion at least partially overlaps a bridge electrode. The touch control electrode portion includes a plurality of touch control metal portions formed in a metal grid shape and electrically connected with each other; and the bridge electrode includes a plurality of bridge metal portions.