Pixel Circuit Integrating Fingerprint Acquisition in Display Panel
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Solution Overview
Problem
Conventional display devices require separate components and circuits for fingerprint recognition, which occupy additional space and hinder the integration of fingerprint authentication within the display area, limiting the display area and bezel size.
Innovation Solution
A pixel circuit that integrates a driving sub-circuit, writing sub-circuit, light-emitting device, and fingerprint information output sub-circuit, utilizing a coupling capacitance between a fingerprint and an electrode to acquire and output fingerprint information directly within the display area, eliminating the need for separate fingerprint acquisition components and circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fingerprint recognition components and circuits are used, then fingerprint authentication function is achieved, but display area is reduced and bezel size increases
Solution Approach 1:
The patent merges the fingerprint recognition function with the display panel by integrating the fingerprint sensing electrode into the existing display structure. The sensing electrode is formed in the same pixel circuit layer as the display elements, allowing fingerprint authentication to be performed through the display area itself without requiring separate components, thereby maintaining full display area while enabling biometric authentication.
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the display interface and the fingerprint sensing interface. The pixel circuit structure is configured to perform both display driving and fingerprint signal acquisition, eliminating the need for dedicated fingerprint recognition hardware and expanding the functional utility of the display panel.
2Reliability
If separate fingerprint recognition components and circuits are used, then fingerprint authentication function is achieved, but device structure becomes more complex
Solution Approach 1:
The patent combines the fingerprint sensing circuitry with the display driver circuitry within the same pixel circuit. The sensing electrode is integrated into the pixel structure, and the same control signals used for display operation are utilized to activate fingerprint sensing mode, thereby simplifying the overall device architecture while maintaining authentication functionality.
Solution Approach 2:
The pixel circuit is designed to perform dual functions: driving the light-emitting device for display and acquiring fingerprint information through the sensing electrode. By using the existing circuit infrastructure for both purposes, the patent avoids adding separate fingerprint recognition components, thus reducing structural complexity while enabling authentication.
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 direct fingerprint recognition within the display area, increasing the display area and facilitating a narrow bezel by integrating fingerprint acquisition and recognition functions into the display panel without additional components or circuits.
Implementation Method 1
utilizing a coupling capacitance between a fingerprint and an electrode to acquire and output fingerprint information directly within the display area
Data Source
AI summary
A pixel circuit includes a driving sub-circuit, a writing sub-circuit, a light-emitting device and a fingerprint information output sub-circuit. The writing sub-circuit is coupled to the driving sub-circuit, a first signal terminal and a data signal terminal, which is configured to write a data signal to the driving sub-circuit under control of a signal from the first signal terminal. The driving sub-circuit is coupled to an anode of the device and a first voltage terminal, which is configured to drive the device to emit light by using a voltage from the first voltage terminal, and provide a coupling capacitance to acquire fingerprint information. The fingerprint information output sub-circuit is coupled to the anode, a third signal terminal and a signal reading line, which is configured to output a signal acquired at the anode as the information to the line under control of a signal from the third signal terminal.