Fingerprint Detection Sensor Patterning for High-Transmittance Displays
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Solution Overview
Problem
Existing display devices face challenges in achieving high light transmittance while integrating fingerprint detection sensors, leading to reduced visibility and functionality.
Innovation Solution
A manufacturing method for a detection sensor involving the formation of a biometric information sensing layer with transmissive and light-blocking patterns, using abrasive materials with specific zeta potentials to selectively polish the light-blocking portion, exposing the transmissive portions for improved light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detection sensor is integrated into the display panel, then fingerprint sensing function is added, but light transmittance is reduced
Solution Approach 1:
The optical pattern layer is divided into transmissive portions and light blocking portions with different optical properties. The transmissive portions allow light to pass through for fingerprint sensing, while the light blocking portions prevent light leakage. This local differentiation of optical properties enables the detection sensor to maintain both functionality and high light transmittance by ensuring that light is transmitted only where needed (through the transmissive portions) while being blocked in other areas.
2Object-affected harmful factors
If light blocking material is coated to cover transmissive portions, then light leakage is prevented, but light transmittance is reduced
Solution Approach 1:
The light blocking material is selectively applied only in the light blocking portions of the optical pattern layer, while the transmissive portions remain free of this material. This localized application ensures that light leakage is prevented in areas where it would cause harm (light blocking portions) while light transmittance is maintained in areas where light transmission is needed (transmissive portions).
Solution Approach 2:
The optical pattern layer is segmented into distinct transmissive portions and light blocking portions. This segmentation allows the light blocking material to be applied only to the light blocking portions, preventing light leakage without interfering with the light transmission function of the transmissive portions. The segmented structure enables simultaneous achievement of light leakage prevention and high light transmittance.
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
The method results in a detection sensor with enhanced light transmittance, ensuring clear visibility and effective fingerprint recognition without residue, thereby improving the overall display device performance.
Implementation Method 1
spraying an abrasive having the first zeta potential on the initial light blocking portion, and polishing the initial light blocking portion such that the upper surface of the transmissive portions is exposed to form a light blocking portion
Data Source
AI summary
A method of manufacturing a detection sensor is disclosed. The method includes forming a biometric information sensing layer including a transistor on a base layer, forming an initial optical pattern layer on the biometric information sensing layer, patterning the initial optical pattern layer to form a plurality of transmissive portions spaced apart from each other and having a first zeta potential, coating a light blocking material to form an initial light blocking portion that covers a side surface and an upper surface of the transmissive portions and has a second zeta potential different from the first zeta potential, and polishing the initial light blocking portion such that the upper surface of the transmissive portions is exposed to form a light blocking portion. The initial light blocking portion is polished by the abrasive, which has the first zeta potential, using a pad.