Display Panel Micro LED Fingerprint Recognition Sub-Pixel Design
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Solution Overview
Problem
Existing display technologies face challenges in providing sufficient light intensity for effective fingerprint recognition, leading to insufficient signal quality and hindering mass production of fingerprint recognition systems.
Innovation Solution
A display panel design incorporating a recognition area with sub-pixels that include a pixel driving circuit, first and second control circuits, an organic light emitting diode, a micro light emitting diode, and a photoelectric converter, where the micro light emitting diode emits stronger light to enhance the optical signal received by the photoelectric converter for improved signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emitting structures are used in display panels, then the display function is achieved, but the light intensity is insufficient for effective fingerprint recognition
Solution Approach 1:
The patent divides each pixel into multiple sub-pixels, where specific sub-pixels are dedicated to fingerprint recognition functionality. This segmentation allows dedicated light emitting diodes in recognition sub-pixels to provide focused, high-intensity light for fingerprint scanning, resolving the contradiction between display function and sufficient light intensity for recognition.
Solution Approach 2:
The patent implements different functional qualities in different regions of the display panel. Recognition area sub-pixels contain light emitting diodes with higher light intensity specifically for fingerprint recognition, while other sub-pixels maintain standard display characteristics. This local differentiation resolves the contradiction by providing high illumination intensity only where needed for fingerprint recognition.
2Measurement precision
If light intensity is increased to improve fingerprint recognition, then signal quality improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic illumination where light emitting diodes in recognition sub-pixels are activated only during fingerprint scanning periods rather than continuously. This periodic action provides high-intensity light signals when needed for measurement precision while minimizing energy consumption by keeping these light sources inactive during normal display operation.
Solution Approach 2:
The patent dynamically controls the activation state of light emitting diodes in recognition sub-pixels based on operational mode. During fingerprint recognition, these diodes are activated to provide high signal quality; during normal display operation, they remain inactive. This dynamic switching resolves the contradiction between signal quality and energy consumption.
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
The enhanced light intensity from the micro light emitting diode improves fingerprint recognition accuracy and overcomes the limitations of insufficient light intensity in existing systems, enabling more reliable fingerprint detection.
Implementation Method 1
a micro light emitting diode and a photoelectric converter, wherein the micro light emitting diode emits stronger light
Implementation Method 2
the photoelectric converter is configured to receive light emitted by the micro light emitting diode and is reflected by a finger
Data Source
AI summary
The present disclosure discloses a display panel, a manufacturing method, a driving method and a display device. When the display panel needs to display a normal image, a pixel driving circuit and a first control circuit drive an organic light emitting diode to emit light. When the display panel needs to perform fingerprint detection of a finger, the pixel driving circuit and a second control circuit drive a micro light emitting diode to emit light, so that the light emitted by the micro light emitting diode can be received by a photoelectric converter after being reflected by the finger, the photoelectric converter can output a detection signal, and furthermore, fingerprint information of the finger can be determined according to the detection signal.