Touch Display Panel Circuit Segmentation for Yield Improvement
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Solution Overview
Problem
Traditional In cell capacitive touch display panels have complex production processes and lower yield rates due to sensing and driving circuits being on the same metal layer, requiring a simpler and more efficient design.
Innovation Solution
A touch display panel design featuring a color filter substrate, an array substrate with a thin film transistor array, a common electrode layer with separate driving and sensing portions, and a sensing layer in a metal-mesh configuration, connected through specific through-holes for signal transmission, allowing for a simpler production process and higher yield rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing circuits and driving circuits are disposed on the same metal layer, then the structure is more integrated, but the production process becomes more complex and yield rate decreases
Solution Approach 1:
The patent divides the common electrode layer into distinct driving portion and sensing portion, and separates sensing circuits and driving circuits onto different metal layers. This segmentation allows independent optimization of each circuit type and simplifies the production process by enabling separate routing paths through dedicated through-holes, thereby resolving the contradiction between integration and production complexity.
Solution Approach 2:
The patent transitions from a two-dimensional planar arrangement where all circuits share the same metal layer to a three-dimensional stacked architecture with sensing circuits on one metal layer and driving circuits on another. This dimensional change enables spatial separation of circuits while maintaining compact integration, simplifying the production process through layered fabrication and dedicated through-hole connections.
2Length of stationary object
If sensing circuits and driving circuits share the same metal layer, then layer structure is simplified, but signal transmission becomes more complex
Solution Approach 1:
The common electrode layer is segmented into driving portion and sensing portion, each serving dedicated functions. Sensing circuits connect to sensing portions through third through-holes while driving circuits connect to driving portions through second through-holes. This segmentation creates distinct signal transmission paths that eliminate interference and simplify the overall signal routing complexity despite maintaining a compact layered structure.
Solution Approach 2:
The patent introduces intermediate connection structures (through-holes with conductive fillers) that mediate between the sensing circuits/driving circuits on one metal layer and the corresponding portions of the common electrode layer. These intermediaries provide reliable signal transmission paths while maintaining the simplified layered architecture, resolving the contradiction between layer simplicity and signal transmission complexity.
3Reliability
If through-holes are used to connect circuits to touch pixels, then electrical connection is achieved, but production yield rate decreases
Solution Approach 1:
The patent segments the through-hole connections into different types (second through-holes for driving circuits, third through-holes for sensing circuits) located at different positions and serving different functions. This segmentation allows optimized design of each through-hole set, reducing the overall complexity and potential failure points, thereby maintaining reliable electrical connections while improving production yield rate through simplified manufacturing processes.
Data Source
AI summary
A touch display panel and a touch display device are disclosed, and the touch display panel includes a color filter substrate, an array substrate, a liquid crystal layer, a thin film transistor array layer, a common electrode layer, a sensing layer and a pixel electrode layer. The thin film transistor array layer, the common electrode layer, the sensing layer and the pixel electrode layer are separated from each other through a dielectric layer, respectively. The touch display panel and the touch display device have a simpler production process and a higher yield rate.