OLED Fingerprint Sensing Layout for Full-Screen Unlocking
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Solution Overview
Problem
Fingerprint unlocking modules in OLED display devices are limited to specific areas, affecting user experience.
Innovation Solution
Integration of a fingerprint recognition module into the OLED screen array, utilizing a flexible substrate with specific thin film transistor structures and layers, including high-mobility polysilicon and low-leakage current materials, to expand the unlocking area and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If fingerprint recognition module is integrated into OLED screen array, then unlocking area is increased, but device complexity increases
Solution Approach 1:
The patent merges the fingerprint recognition module with the OLED display panel by integrating photosensitive areas between pixel areas within the same substrate. The fingerprint sensor shares the same flexible substrate, thin film transistors, and manufacturing process as the display, combining two functions into a single unified structure that increases unlocking area while avoiding the complexity of separate modules.
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the visual display interface and the fingerprint recognition interface. The photosensitive areas within the pixel structure enable the display to detect light reflections for fingerprint scanning, making the same component universal for both display and biometric authentication purposes.
2Ease of manufacture
If fingerprint recognition module is integrated into OLED screen array, then manufacturing cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs low-temperature polysilicon (LTPS) thin film transistor technology with specific material parameters (mobility greater than 10 cm²/Vs) to enable precise control of pixel circuits and fingerprint sensor circuits. This parameter optimization allows the integration of multiple functions while maintaining manufacturability through existing low-temperature processing techniques rather than requiring high-precision high-temperature fabrication.
Solution Approach 2:
The patent implements different transistor designs in different regions: LTPS TFTs with high mobility for the fingerprint recognition module requiring precise signal detection, and standard TFTs for other display functions. This local differentiation of quality and performance characteristics allows the system to meet high precision requirements only where necessary while maintaining overall manufacturing efficiency.
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 comprehensive screen recognition and increased unlocking area, while reducing manufacturing costs by embedding the fingerprint recognition sensor into the OLED display device.
Implementation Method 1
an OLED light emitting unit comprises a second thin film transistor
Implementation Method 2
the optical sensor recognizes the difference in the reflected light intensity between the ridge and valley of the fingerprint to obtain the fingerprint appearance
Data Source
AI summary
An organic light emitting diode (OLED) display device and a method of manufacturing thereof are provided. The organic light emitting diode display device includes a display area and a non-display area. The display area includes a pixel area and a photosensitive area disposed between the pixel areas. The photosensitive area includes a first thin film transistor. The pixel area includes a second thin film transistor, which the same type as the first thin film transistor. The non-display area includes a third thin film transistor, which is a different type from the first thin film transistor.