Display-Integrated Fingerprint Sensing With Time-Separated Readout
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Solution Overview
Problem
Conventional fingerprint sensing technologies are not effectively integrated into display devices, limiting their functionality and user experience in terms of biometric authentication and input recognition.
Innovation Solution
A display device with integrated fingerprint sensing capabilities, utilizing subpixel circuitry and photodiode circuitry to detect fingerprint data through current signals, allowing for simultaneous display updating and fingerprint sensing by driving select and monitor signals to subpixels and photodiodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint sensing is integrated into display device, then biometric authentication capability is improved, but device complexity increases
Solution Approach 1:
The patent merges fingerprint sensing functionality with display device by integrating photodiode circuitry and subpixel circuitry into the same device structure. The photodiodes are positioned to receive light from subpixels, creating a combined display and sensing system that performs both functions without requiring separate dedicated components.
Solution Approach 2:
The display device is designed to perform multiple functions: displaying visual information through subpixels and performing fingerprint sensing through photodiodes. The same physical structure supports both display operations and biometric authentication, making the device universal in its capabilities.
2Speed
If fingerprint sensing is performed simultaneously with display updating, then sensing speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent implements periodic action by dividing operation into distinct time periods: a first period for display updating and a second period for fingerprint sensing. During the first period, subpixels are updated with display data; during the second period, photodiodes are read out for fingerprint measurement. This periodic alternation allows both functions to operate at high speed while maintaining measurement precision through dedicated measurement time.
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 efficient fingerprint sensing and authentication by integrating fingerprint recognition into the display device, enhancing user interaction and security without compromising display performance.
Implementation Method 1
a first photodiode coupled to a first select line of the plurality of select line... receive a second current signal from the first photodiode during a second period
Data Source
AI summary
A fingerprint sensing device integrated within a display device. The display device comprises source lines, monitor lines, gate lines, select lines, and subpixels. A first subpixel comprises first subpixel circuitry coupled to a first source electrode, a first monitor line, and a first gate line, and a first photodiode circuitry coupled to a first select line. The display device further comprises measurement circuitry coupled to the first subpixel via the first monitor line. The measurement circuitry is configured to receive a first current signal from the first subpixel circuitry during a first period via the first monitor line, receive a second current signal from the first photodiode circuitry during a second period via the first monitor line, and determine fingerprint data from the second current signal.