Under-Display Light-Sensing Pixel Layout for Fingerprint Accuracy
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting biometric information and fingerprint authentication due to limitations in light sensing structures, particularly in portable electronic devices.
Innovation Solution
The display device incorporates a display panel with light-sensing pixels that include two photo-detecting elements, each connected to separate light-sensing lines, and is equipped with a light-sensing scan driver to enhance light sensing efficiency for fingerprint detection and biometric information detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single photo-detecting element is used in each light-sensing pixel, then the device complexity is low, but the measurement precision of biometric information is insufficient
Solution Approach 1:
The light-sensing pixel is segmented into multiple photo-detecting elements (first and second photo-detecting elements) that are spatially separated within the same pixel. Each photo-detecting element has its own dedicated light-sensing line, allowing independent signal acquisition. This segmentation enables the system to capture multiple light signals simultaneously from different positions, thereby improving fingerprint detection accuracy and biometric measurement precision without requiring a completely separate sensing system for each measurement.
2Productivity
If multiple photo-detecting elements are disposed in each light-sensing pixel, then the light sensing efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The pixel structure is divided into distinct regions with dedicated photo-detecting elements, each connected to separate light-sensing lines. This segmentation allows for modular manufacturing where each photo-detecting element can be independently positioned and calibrated. The first photo-detecting element is connected to the first light-sensing line and the second photo-detecting element is connected to the second light-sensing line, creating a systematic arrangement that simplifies manufacturing precision requirements compared to a monolithic sensing structure.
Solution Approach 2:
Different photo-detecting elements are positioned at specific locations within the light-sensing pixel to detect light from different directions or depths. The first photo-detecting element and second photo-detecting element are strategically placed to optimize their local sensing capabilities. This local quality approach allows each element to be optimized for its specific sensing function while maintaining overall system coherence, reducing the stringency of uniform manufacturing precision requirements across the entire pixel array.
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
This configuration improves the accuracy of fingerprint detection and biometric information measurement, enhancing user reliability and satisfaction by optimizing the shape, area, and opening width of the photo-detecting elements.
Implementation Method 1
Each of the light-sensing pixels includes at least two photo-detecting elements spaced from each other... configured to detect light incident from a front side
Data Source
AI summary
A display device includes: a display panel having an image display area including image display pixels, infrared (IR) light-emitting pixels, and light-sensing pixels; a display scan driver to drive the image display pixels and the IR light-emitting pixels to emit light; a light-sensing scan driver to drive the light-sensing pixels to sense light; and a main driver circuit to receive first and second light-sensing signals through first and second light-sensing lines connected to the light-sensing pixels. Each of the light-sensing pixels includes at least two photo-detecting elements spaced from each other, and the first and second light-sensing lines are to transmit the first and second light-sensing signals generated from the at least two photo-detecting elements.