Under-Display Fingerprint Sensor Layout for Luminance Uniformity
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Solution Overview
Problem
Existing display devices with integrated fingerprint sensors suffer from display characteristic issues due to the fingerprint sensor affecting the luminance uniformity of the display panel, causing brightness or darkness anomalies around the sensor area.
Innovation Solution
A display device design that includes a translucent protective film and adhesive layers covering the fingerprint sensor, along with a cover layer and light absorbing member, to minimize luminance variations by managing light propagation and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensor is integrated into the display device, then the device gains fingerprint detection functionality, but light absorption and display region uniformity are affected
Solution Approach 1:
The cover layer is divided into a fingerprint sensor region and a non-fingerprint sensor region, allowing different optical properties in different areas. The fingerprint sensor region has optimized light transmission characteristics to reduce light absorption and maintain display uniformity while enabling fingerprint detection functionality.
Solution Approach 2:
Different regions of the cover layer are designed with different optical properties. The fingerprint sensor region is specifically engineered to minimize light absorption and maintain uniformity, while other regions can have different characteristics optimized for their specific functions.
2Device complexity
If a fingerprint sensor is disposed below the display panel, then the display structure is simplified, but light interference and display quality are compromised
Solution Approach 1:
The fingerprint sensor is positioned in the thickness direction below the display panel rather than integrating it laterally, simplifying the overall display structure. The cover layer with its specific optical properties compensates for light interference by optimizing light transmission paths in the vertical dimension.
Solution Approach 2:
The cover layer acts as an intermediary between the fingerprint sensor and the display region, mediating light transmission to reduce interference. It serves as an optical interface that allows the fingerprint sensor to function while maintaining display quality.
3Reliability
If adhesive layers and protective films are added to accommodate the fingerprint sensor, then the fingerprint sensor can be properly positioned, but the number of components and assembly complexity increases
Solution Approach 1:
The cover layer integrates multiple functions: it protects the display panel, accommodates the fingerprint sensor through a specifically designed opening, and optimizes light transmission. By combining these functions into a single component, the overall number of components is reduced while maintaining proper fingerprint sensor positioning.
Solution Approach 2:
The cover layer serves as a multi-functional component that simultaneously provides protection, positioning, and optical optimization. This universal component reduces assembly complexity by eliminating the need for separate protective films and positioning structures.
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
Improves display characteristics by reducing luminance inconsistencies around the fingerprint sensor area, enhancing the overall display quality and user experience.
Implementation Method 1
a light absorbing member disposed below the cover layer and that covers the opening
Implementation Method 2
a protective film disposed below the first adhesive layer and that is translucent
Data Source
AI summary
A display device includes a display panel that has a display region in which an image is displayed, a first adhesive layer disposed below the display panel, a translucent protective film disposed below the first adhesive layer, a fingerprint sensor disposed below the protective film and that overlaps the display region, the first adhesive layer, and the protective film when viewed in a plane, and a cover layer disposed below the protective film and in which an opening for accommodating the fingerprint sensor is formed.