Biometric Recognition Display Panel Light Sensing
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Solution Overview
Problem
Traditional display panels face difficulties in recognizing biometric signals due to small sensing electrodes and large distances, requiring expensive customized chips to process output signals effectively.
Innovation Solution
A biometric-recognition display panel is designed with a substrate, pixel array, and control circuit, where sensing circuits generate threshold voltages based on light intensity, allowing for biometric recognition without the need for high-specification driving chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing circuit with capacitive touch method is configured in the display panel, then biometric recognition function is added, but the output signal is difficult to recognize due to small sensing electrode area and large distance
Solution Approach 1:
The patent merges the display pixel function and sensing circuit function into a single integrated structure. The sensing circuit is configured within the pixel unit, sharing the same substrate and circuit resources, which eliminates the need for separate sensing electrodes and reduces the distance between sensing elements and the finger touch surface.
Solution Approach 2:
The patent transitions from a traditional capacitive touch method using separate sensing electrodes to a light-based sensing dimension. By using the display panel's light emission or reflection characteristics to sense biometric information, the system achieves sensing functionality through optical dimension rather than electrical capacitance dimension.
2Device complexity
If sensing circuits with small sensing electrodes are used, then device complexity is reduced, but the output signal intensity is insufficient for effective recognition
Solution Approach 1:
The patent replaces the traditional mechanical/electrical capacitive sensing system with an optical sensing system. Instead of relying on capacitance changes from finger proximity to small electrodes, the system uses light interaction (emission, reflection, or absorption) to detect biometric characteristics, providing sufficient signal intensity without increasing electrode size.
3Area of stationary object
If the distance between sensing circuit and finger is increased, then display area is maximized, but signal recognition becomes more difficult
Solution Approach 1:
The patent replaces contact-based or proximity-based electrical sensing with optical sensing that can effectively operate at larger distances. The light-based sensing mechanism maintains sufficient signal strength even when the finger is not in direct contact with the display surface, enabling full display area utilization without compromising detection accuracy.
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 enhances the intensity of output signals and enables effective biometric recognition without the need for expensive processing chips, improving resolution and flexibility in display panel arrangements.
Implementation Method 1
each of the sensing circuits generates a threshold voltage by sensing the intensity of light
Implementation Method 2
each of the sensing circuits generates a threshold voltage by sensing the intensity of light
Data Source
AI summary
A biometric-recognition display panel is provided. The biometric-recognition display panel includes a substrate, a pixel array, a plurality of sensing circuits and a control circuit. The substrate includes a display area. The pixel array is disposed on the display area and the pixel array includes a plurality of pixels. The sensing circuits are disposed on the display area and each of the sensing circuits generates a threshold voltage by sensing the intensity of light. The control circuit performs biometric recognition according to each of the threshold voltages generated by each of the sensing circuits.