OLED Display Substrate With Integrated Fingerprint Recognition Electrodes
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Solution Overview
Problem
Existing OLED display devices lack integrated fingerprint recognition functions, requiring external components with complex structures, which hinders their integration with fingerprint recognition technologies.
Innovation Solution
An OLED display substrate is designed with integrated pattern recognition capabilities, incorporating a substrate with organic light-emitting diode units, readout lines, control lines, and reading transistors that form photodiodes to detect electric currents and recognize touch patterns on a light-reflecting surface, such as fingerprints, while also functioning for image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external fingerprint recognition components are added to OLED display devices, then fingerprint recognition function is achieved, but device structure becomes complex
Solution Approach 1:
The patent combines fingerprint recognition electrodes with the display electrode structure. The same electrode that displays images also serves as the sensing electrode for fingerprint recognition, eliminating the need for separate external fingerprint recognition components and simplifying the overall device structure.
Solution Approach 2:
The display electrode is designed to perform multiple functions: it serves both as the light-emitting display element and as the touch sensing element for fingerprint recognition. This multi-functional design reduces the number of components needed in the device.
2Device complexity
If integrated pattern recognition is implemented in OLED display substrate, then external components are eliminated, but manufacturing process becomes more complex
Solution Approach 1:
The electrode structure is divided into multiple independent electrode regions (first electrode, second electrode, third electrode, fourth electrode) that can be independently controlled. This segmentation allows different regions to serve different functions (display vs. fingerprint recognition) while using the same fabrication process, making the integrated design manufacturable.
Solution Approach 2:
Different regions of the electrode structure are assigned different functions: some regions are optimized for light emission (display) while others are optimized for touch sensing (fingerprint recognition). This local differentiation allows the same base structure to serve multiple purposes without requiring completely different manufacturing processes for each function.
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 solution enables seamless integration of fingerprint recognition with display functions, allowing for effective pattern recognition without the need for external components, enhancing security and operability by analyzing electric currents generated by photodiodes to identify touch patterns.
Implementation Method 1
the first electrode layer and the second electrode are configured to form a photodiode
Implementation Method 2
an organic light-emitting diode unit includes a first layer comprising an anode and a first electrode apart from the anode; an organic light-emitting layer; and a cathode
Implementation Method 3
the anode and the cathode are configured to drive the organic light-emitting layer to emit light
Data Source
AI summary
The present disclosure provides an organic light-emitting diode (OLED) display substrate. The OLED display substrate includes a substrate and a plurality of organic light-emitting diode units. An organic light-emitting diode unit includes a first layer having an anode and a first electrode apart from the anode; an organic light-emitting layer; a cathode; and a second electrode insulated from the cathode. The anode and the cathode are configured to drive the organic light-emitting layer to emit light; and the first electrode and the second electrode are configured to recognize touch patterns.