Under-Display Fingerprint Sensor Array Layout
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Solution Overview
Problem
Current display panels with fingerprint recognition modules in non-display areas limit full screen design, necessitating a solution for under-display fingerprint recognition.
Innovation Solution
Incorporating a fingerprint recognition film layer with image sensing elements arranged in an array between the display and touch film layers, ensuring these elements do not overlap with light-emitting sub-pixels, allowing for effective fingerprint collection without obstructing light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint recognition module is arranged in the non-display area, then the fingerprint recognition function can be realized, but the full screen design is limited
Solution Approach 1:
The patent merges the fingerprint recognition module with the display structure by placing image sensing elements within the display area between the display film layer and touch film layer, combining two previously separate functions (display and fingerprint recognition) into a single integrated structure, thereby achieving full screen design while maintaining fingerprint recognition capability
Solution Approach 2:
The patent transitions from arranging fingerprint recognition elements in the horizontal plane (non-display area) to utilizing the vertical dimension by placing image sensing elements between the display film layer and touch film layer, effectively using the Z-axis space to resolve the conflict between display area and fingerprint recognition function
2Reliability
If the fingerprint recognition film layer is placed at the light-emitting side, then under-display fingerprint recognition is achieved, but light emission may be blocked
Solution Approach 1:
The patent applies local quality by making the image sensing elements transparent or translucent at their specific locations within the display structure, allowing light to pass through these localized areas while maintaining fingerprint sensing capability, thus resolving the conflict between under-display recognition and light emission
Solution Approach 2:
The patent introduces an adhesive layer as an intermediary between the display film layer and the fingerprint recognition film layer, which helps transmit light while supporting the image sensing elements, acting as a mediator that allows both light transmission and fingerprint recognition to coexist
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 full screen design by allowing fingerprint recognition without blocking light-emitting sub-pixels, enhancing the display panel's light efficiency and usability.
Implementation Method 1
an orthographic projection of the image sensing element on the substrate is not overlapped with an orthographic projection of a light-emitting sub-pixel in the display film layer on the substrate
Data Source
AI summary
Display panels and display devices, in order to provide a new full screen solution that can realize fingerprint recognition. The display panel includes a substrate, a display film layer located on a surface of the substrate and a touch film layer located above the display film layer. The display panel further includes a fingerprint recognition film layer including a plurality of image sensing elements arranged in an array, and an orthographic projection of the image sensing element on the substrate is not overlapped with an orthographic projection of the light-emitting sub-pixels in the display film layer on the substrate.