Display Panel Full-Screen Fingerprint Integration
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Solution Overview
Problem
Conventional display panels have a small fingerprint recognition area, making structural design difficult and compromising recognition accuracy due to the need for separate space for the fingerprint recognition module.
Innovation Solution
Integrating fingerprint pixels and sensors onto the color filter substrate with black matrices and polarizers to enable full-screen fingerprint recognition, eliminating the need for structural avoidance and addressing reflection issues from bare metal traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fingerprint recognition module is disposed in the non-display area of the display panel, then the display panel can be designed with a separate space for fingerprint recognition, but the fingerprint recognition area becomes small and structural design becomes difficult
Solution Approach 1:
The patent merges the fingerprint recognition module with the display panel by integrating fingerprint pixels directly into the display structure. The fingerprint sensor is disposed between the color filter substrate and the black matrix, allowing fingerprint recognition functionality to be combined with the display area rather than being separated into the non-display area. This merging resolves the contradiction by enabling full-screen fingerprint recognition while maintaining ease of structural design.
Solution Approach 2:
The display panel structure is designed to serve multiple functions: it acts as both a display device and a fingerprint recognition device. The color filter substrate, black matrix, and fingerprint sensor are integrated into a single structure that simultaneously performs display and fingerprint recognition functions. This multi-functionality allows the same area to serve dual purposes, increasing the fingerprint recognition area without complicating the structural design.
2Area of moving object
If the fingerprint sensor is integrated onto the color filter substrate, then the fingerprint recognition area increases to full-screen, but the structural design complexity increases due to integration requirements
Solution Approach 1:
The patent combines multiple components (color filter substrate, black matrix, fingerprint sensor) into an integrated structure where the fingerprint sensor is disposed between the color filter substrate and the black matrix. This merging approach allows full-screen fingerprint recognition while using the existing display panel layers, thereby avoiding significant increases in structural complexity.
Solution Approach 2:
The fingerprint sensor is nested within the existing display panel structure, specifically positioned between the color filter substrate and the black matrix. This nesting approach allows the fingerprint recognition functionality to be embedded within the display panel without adding external complexity, as the sensor utilizes the existing layered structure of the display panel.
3Reliability
If bare metal traces are present in the fingerprint sensor, then electrical connection is achieved, but reflection problems occur that affect fingerprint recognition accuracy
Solution Approach 1:
The patent addresses the harmful reflection effect of bare metal traces by covering them with the black matrix. The black matrix, which would normally be considered a structural element, is used to eliminate the harmful reflection that would otherwise degrade fingerprint recognition accuracy. This converts the potential harm of visible metal traces into a benefit by using the black matrix to both provide structural support and eliminate optical interference.
Solution Approach 2:
The black matrix acts as an intermediary layer between the fingerprint sensor and the display surface. It mediates the conflict between electrical connection (requiring metal traces) and fingerprint recognition accuracy (requiring minimal reflection). The black matrix covers the metal traces to prevent reflection while allowing the electrical connections to function beneath it.
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 integration allows for improved fingerprint recognition accuracy and reduced structural design complexity by enabling full-screen fingerprint recognition without compromising display functionality.
Implementation Method 1
the optical fingerprint sensor includes a first thin film transistor and a photodiode electrically connected to the first thin film transistor
Implementation Method 2
the ultrasonic sensor includes a second thin film transistor and a piezoelectric chip electrically connected to the second thin film transistor
Implementation Method 3
a circular polarizer having a predetermined wavelength disposed on a side of the color filter substrate opposite another side of the color filter substrate facing the fingerprint pixels
Data Source
AI summary
A display panel is provided, the display panel including a color filter substrate; a plurality of fingerprint pixels disposed on a side of the color filter substrate; a plurality of fingerprint pixels disposed on a side of the color filter substrate; wherein each of the fingerprint pixels comprises a pixel unit and a fingerprint sensor; and a first black matrix disposed between the adjacent pixel units, wherein the fingerprint sensor is disposed between the color filter substrate and the first black matrix.