Under-Display Fingerprint Sensor Light Shield Layer Design
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Solution Overview
Problem
The COE technology used in OLED displays is not suitable for fingerprint identification as it blocks light due to the presence of a black matrix, preventing the transmission of light necessary for fingerprint recognition.
Innovation Solution
A display panel design that includes a fingerprint identification sensor, a first light shield layer with openings, and a color film layer with light transmission parts between color filters, allowing fingerprint reflected light to reach the sensor while blocking stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If COE technology uses black matrix and color filter as anti-reflection layers, then reflection of external ambient light is reduced, but light transmission is blocked preventing fingerprint identification
Solution Approach 1:
The black matrix layer is segmented into multiple regions: a first region with first openings for fingerprint identification light to pass through, and a second region with second openings for display light to pass through. This segmentation allows the black matrix to simultaneously serve as an anti-reflection layer and permit light transmission for fingerprint sensing.
Solution Approach 2:
Different regions of the black matrix are assigned different functions: the first region is optimized for fingerprint identification with first openings, while the second region is optimized for display with second openings. This local differentiation allows each region to perform its specific function effectively while maintaining the overall anti-reflection property of the COE structure.
2Object-affected harmful factors
If black matrix is used to block light for anti-reflection, then ambient light reflection is reduced, but fingerprint reflected light cannot reach the sensor
Solution Approach 1:
The black matrix is divided into functional regions with different opening patterns. The first region contains first openings that allow fingerprint reflected light to reach the sensor, ensuring reliable fingerprint identification while the black matrix maintains its anti-reflection function in other areas.
Solution Approach 2:
The first openings in the black matrix act as intermediaries that enable the transmission of fingerprint reflected light through the otherwise light-blocking COE structure, allowing the sensor to receive sufficient light for reliable fingerprint identification while maintaining the anti-reflection properties of the black matrix.
3Object-affected harmful factors
If COE structure blocks light transmission, then anti-reflection is achieved, but manufacturing complexity increases for enabling fingerprint identification
Solution Approach 1:
The black matrix is segmented into regions with different opening patterns that can be manufactured using standard photolithography processes. The first openings for fingerprint identification and second openings for display are created through patterning steps that integrate with existing COE manufacturing workflows.
Solution Approach 2:
The black matrix layer is designed to serve multiple functions simultaneously: it acts as an anti-reflection layer, provides structural support, and contains opening patterns that enable both display light transmission and fingerprint light transmission. This multi-functionality reduces the need for additional dedicated layers or components.
4Use of energy by stationary object
If black matrix occludes light in COE technology, then power consumption is reduced through anti-reflection, but fingerprint identification capability is lost
Solution Approach 1:
The black matrix is segmented to allow light transmission at specific locations (first openings) while maintaining anti-reflection properties in other areas. This enables fingerprint identification capability to be added to the low-power COE display structure without significantly increasing overall power consumption.
Solution Approach 2:
The black matrix exhibits different optical properties in different regions: regions with first openings allow light transmission for fingerprint identification, while other regions maintain high anti-reflection performance. This local differentiation enables the display to maintain low power consumption while adding fingerprint identification functionality.
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
Enables fingerprint identification through the display screen without increasing power consumption, with a simple manufacturing process and high production efficiency, resulting in low production costs and high yields.
Implementation Method 1
the first light shield layer includes a first opening and a light shield part, wherein the light transmission part and the first openings are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor, and the light shield part is used for blocking out stray light
Implementation Method 2
the color film layer includes color filters with different colors and a light transmission part disposed between the color filters with different colors; the light transmission part and the first opening are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor
Implementation Method 3
a fingerprint identification sensor, a first light shield layer disposed above the fingerprint identification sensor
Data Source
AI summary
Provided are a display panel and a display apparatus. The display panel includes a fingerprint identification sensor, a first light shield layer disposed on the fingerprint identification sensor and a color film layer disposed on the first light shield layer, wherein the color film layer includes color filters with different colors and light transmission parts disposed between the color filters with different colors; the first light shield layer includes first openings and light shield parts, the light transmission parts and the first openings are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor, and the light shield parts are used for blocking out stray light.