Under-Display Fingerprint Sensor Light Transmission 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 and fingerprint identification cannot be performed
Solution Approach 1:
The display panel is divided into different regions: a first region with the COE structure (black matrix and color filter) for display purposes, and a second region without the black matrix layer for fingerprint identification. This segmentation allows different functional requirements to be met in different areas of the same display panel.
Solution Approach 2:
The black matrix layer is selectively removed or made transparent in the fingerprint identification region, creating local quality differences. This allows the COE technology to maintain its anti-reflection properties in the display area while enabling light transmission in the fingerprint sensing area.
2Object-affected harmful factors
If black matrix layer is added to reduce reflection, then anti-reflection performance is improved, but fingerprint identification capability is lost due to light blockage
Solution Approach 1:
The display panel is segmented into a display region with the COE structure and a fingerprint identification region without the black matrix, allowing both functions to coexist in the same device.
Solution Approach 2:
The display panel is designed to serve multiple functions: display output through the COE structure and fingerprint identification through the transparent region, making the device more versatile without requiring separate components.
3Use of energy by moving object
If COE structure is implemented for low power consumption, then power efficiency is improved, but fingerprint sensing is prevented due to light occlusion
Solution Approach 1:
The COE structure is selectively applied only in the display region, while the fingerprint identification region maintains light transmission capability, allowing the system to achieve low power consumption in display operations without compromising fingerprint sensing 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 light transmission part and the first openings are used for allowing fingerprint reflected light to transmit and reach the fingerprint identification sensor
Implementation Method 2
the light shield part is used for blocking out stray light
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, a manufacturing method thereof 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.