OLED Array Substrate With Integrated Light Detection Units
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Solution Overview
Problem
Current fingerprint recognition technologies in display devices, such as optical, capacitive, and ultrasonic sensors, face challenges in integrating fingerprint recognition with display functionality without compromising accuracy.
Innovation Solution
An OLED array substrate with light detection units integrated into the OLED display panel, allowing for simultaneous fingerprint recognition by emitting and detecting monochromatic light, which does not interfere with the display process, using a pixel circuit that includes transistors and photodetectors to generate light detection signals for fingerprint pattern recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensors are used for fingerprint recognition, then fingerprint recognition function is achieved, but the sensor size becomes larger
Solution Approach 1:
The patent combines the fingerprint recognition function with the OLED display panel by integrating light detection units directly into the pixel circuit. The OLED pixels serve dual purposes: displaying images and providing light for fingerprint recognition. This merging eliminates the need for separate optical sensors, thereby reducing overall sensor size while maintaining fingerprint recognition capability.
Solution Approach 2:
The OLED display panel is designed to perform multiple functions simultaneously: display functionality and fingerprint recognition. The light detection units are integrated into the existing pixel structure, allowing the same physical space to serve both display and biometric authentication purposes, thus avoiding additional space requirements.
2Reliability
If capacitive sensors are used for fingerprint recognition, then fingerprint recognition function is achieved, but the dots per inch (dpi) required is higher
Solution Approach 1:
The patent replaces capacitive sensing mechanisms with an optical detection system integrated into the OLED structure. By using light emission and detection within the pixel circuit, the system achieves fingerprint recognition without requiring high-density capacitive sensor arrays, thereby reducing manufacturing precision requirements.
3Reliability
If ultrasonic sensors are used for fingerprint recognition, then fingerprint recognition function is achieved, but integration with display functionality becomes more complex
Solution Approach 1:
The patent merges the fingerprint recognition function with the OLED display panel by integrating light detection units directly into the pixel circuit. The OLED pixels serve dual purposes: displaying images and providing light for fingerprint recognition. This merging eliminates the need for separate optical sensors, thereby reducing overall sensor size while maintaining fingerprint recognition capability.
4Reliability
If light detection units are integrated into OLED display panel, then fingerprint recognition is enabled, but potential interference with display process may occur
Solution Approach 1:
The system uses periodic action by controlling the OLED pixels to emit light only during specific time periods when fingerprint recognition is required. During normal display operation, the pixels function as usual. This temporal separation ensures that light emission for fingerprint detection does not interfere with the continuous display process.
Solution Approach 2:
The system performs preliminary action by controlling the OLED pixels to emit light in advance during the reset period before actual display content is shown. This allows fingerprint recognition to occur during a time when the display is not yet active, preventing any potential interference between light emission and display functionality.
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 accurate fingerprint recognition while maintaining display functionality, enhancing user experience by integrating fingerprint recognition into the OLED display panel without affecting its performance.
Implementation Method 1
Each of the light detection units can be configured to detect a light emitted by a detection light resource to generate a light detection signal
Implementation Method 2
the light emitted by the detection light resource is monochromatic light
Data Source
AI summary
The embodiments of the present disclosure disclose an OLED array substrate. The OLED array substrate comprises: a plurality of scan lines; a plurality of data lines; a plurality of OLED pixel units, each OLED pixel unit is connected to a corresponding data line and a corresponding scan line and being connected to a corresponding reset terminal; and a plurality of light detection units, each light detection unit is connected between the reset terminal of one OLED pixel unit and the corresponding data line, is configured to detect a light emitted by a detection light resource to generate a light detection signal, and output the light detection signal via the corresponding data line under a control of a reset signal from the reset terminal.