Array Substrate Layout With Fewer Insulating Layers for Fingerprint Sensing
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Solution Overview
Problem
The conventional manufacturing process of display panels with optical fingerprint recognition technology is complicated and cumbersome, requiring multiple insulating layers which increases the complexity and cost.
Innovation Solution
A simplified array substrate design with only two insulating layers on the planarization layer, reducing the number of photomasks needed and streamlining the manufacturing process, while incorporating a PIN diode for improved light absorption and accuracy in fingerprint recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fingerprint recognition technology is used, then fingerprint recognition accuracy and stability are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the functions of multiple insulating layers into a single insulating layer that integrates multiple features (first insulating layer and second insulating layer functions merged into one layer), thereby reducing the number of photomasks needed and simplifying the manufacturing process while maintaining optical fingerprint recognition functionality
Solution Approach 2:
The single insulating layer is designed to perform multiple functions that were previously distributed across separate layers, including electrical insulation, optical isolation, and structural support, making the manufacturing process more efficient and less complex
2Manufacturing precision
If multiple insulating layers are used, then manufacturing precision is maintained, but manufacturing process complexity and cost increase
Solution Approach 1:
The patent merges the functions of multiple insulating layers into a single layer, reducing the number of manufacturing steps and photomasks required while maintaining the necessary precision for optical fingerprint recognition through optimized layer design and material selection
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 approach simplifies the manufacturing process, reduces costs, and enhances the accuracy of fingerprint recognition by using a PIN diode with amorphous silicon for improved light absorption, leading to a more efficient and cost-effective display panel production.
Implementation Method 1
The working principle of optical fingerprint recognition technology is using laws of refraction and reflection of light. Light irradiated on a finger is reflected by the finger to a photosensitive sensor.
Data Source
AI summary
In an array substrate of the present invention, only two insulating layers are arranged on a planarization layer. Compared with conventional techniques that require at least four insulating layers arranged on the planarization layer, a number of the insulating layers arranged on the planarization layer is reduced. Therefore, a number of photomasks is reduced in a manufacturing process of the array substrate, and the manufacturing process is simplified. The present invention also provides a manufacturing method of the array substrate, and a display panel.