Transparent Support Column Collimator for Under-Display Fingerprint Sensors
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Solution Overview
Problem
Conventional display panels suffer from a significant loss of aperture ratio and interference from stray and large-angle interference light, which affects the accuracy of fingerprint recognition when a fingerprint sensor is integrated under the OLED screen.
Innovation Solution
Incorporating a transparent support column made of a photoresist resin high polymer material with a height of 2-4 um, disposed between pixel units, functioning as a collimator to increase light entry into the fingerprint sensor and featuring a light absorbing layer to eliminate stray and large-angle interference light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a collimator is disposed in the liquid crystal layer to enable fingerprint recognition, then fingerprint sensing capability is achieved, but the aperture ratio is reduced by at least 30%
Solution Approach 1:
The patent moves the collimator from the liquid crystal layer (2D plane within the display) to the array substrate layer (3D positioning at the bottom of the display structure). This dimensional relocation allows the collimator to be positioned at the white sub-pixel area without blocking the liquid crystal light path, thus maintaining aperture ratio while achieving fingerprint sensing functionality.
2Reliability
If the collimator is positioned at the white sub-pixel to collect light for fingerprint sensing, then fingerprint recognition is enabled, but stray light and large-angle interference light cannot be eliminated
Solution Approach 1:
The patent introduces a light absorbing layer with specific local properties (light-absorbing material) positioned at the outer surface of the transparent support column. This local quality enhancement selectively absorbs stray light and large-angle interference light while allowing the collimator to continue collecting useful light for fingerprint recognition, thus eliminating harmful factors without affecting the main function.
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
Enhances the aperture ratio and accuracy of fingerprint recognition by optimizing light collection and reducing interference, thereby integrating display, touch, and fingerprint recognition functions effectively.
Implementation Method 1
a transparent support column for supporting the array substrate and the color filter substrate to form the liquid crystal layer, and at least one fingerprint sensor disposed at a position corresponding to the transparent support column
Implementation Method 2
a light absorbing layer is disposed on an outer surface of the transparent support column
Data Source
AI summary
A display panel and a display device are provided. The display panel includes an array substrate, a color filter substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate. The array substrate includes at least one transparent support column for supporting the array substrate and the color filter substrate to form the liquid crystal layer, and at least one fingerprint sensor disposed at a position corresponding to the transparent support column. The display device includes the display panel.