Input-Sensing Display Panel With Embedded Fingerprint Pixels
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Solution Overview
Problem
Existing display devices lack integrated fingerprint identification capabilities, limiting their use in secure authentication methods.
Innovation Solution
A display panel incorporating both light emitting and light sensing pixels, where light emitting pixels emit light in response to scan signals and light sensing pixels convert external light into fingerprint sensing signals, with transistors and electrodes configured to control and store charge for fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices use separate fingerprint sensors and touch screens, then fingerprint identification function is achieved, but device complexity and space occupation increase
Solution Approach 1:
The patent combines the touch screen display and fingerprint sensor into a single integrated panel structure. The fingerprint sensing pixels are embedded within the display panel layers, allowing the same physical space to serve both display and biometric authentication functions, thereby reducing device complexity while maintaining versatility
Solution Approach 2:
The display panel is designed to perform multiple functions simultaneously: it serves as both the visual display interface and the fingerprint sensing interface. The pixel structure is configured to detect both touch interactions and fingerprint patterns, making the single component universal and eliminating the need for separate dedicated sensors
2Adaptability or versatility
If display devices use separate fingerprint sensors and touch screens, then fingerprint identification function is achieved, but space occupation increases
Solution Approach 1:
The fingerprint sensor and display are merged into a single integrated panel where fingerprint sensing pixels are embedded within the display structure. This integration allows both functions to coexist in the same physical footprint, significantly reducing the overall space occupation compared to separate components
Solution Approach 2:
The fingerprint sensing functionality is nested within the display panel layers. The sensing pixels are positioned between the display elements, creating a nested configuration where the fingerprint sensor is embedded inside the display structure, maximizing space utilization
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 intuitive user authentication through fingerprint sensing, enhancing security and usability in devices like smartphones and tablets.
Implementation Method 1
each of the plurality of light sensing pixels includes an organic photodiode which includes a first electrode and a second electrode
Implementation Method 2
each of the plurality of light emitting pixels includes an organic light emitting diode including an anode and a cathode, the cathode receiving a first driving voltage
Data Source
AI summary
A display panel including: a plurality of light emitting pixels which emit light in response to a first scan signal, a second scan signal, and a light emission control signal; and a plurality of light sensing pixels which output a sensing signal corresponding to external light in response to the first scan signal and the second scan signal, wherein each of the plurality of light emitting pixels includes an organic light emitting diode including an anode and a cathode, the cathode receiving a first driving voltage, and each of the plurality of light sensing pixels includes an organic photodiode including a first electrode and a second electrode, wherein the second electrode of the organic photodiode is electrically connected to the cathode of the organic light emitting diode to receive the first driving voltage.