OLED Pixel Circuit Integrating Fingerprint Sensing and Threshold Compensation
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Solution Overview
Problem
Existing organic light-emitting diode (OLED) pixel circuits face issues with unpredictable working currents due to shifting threshold voltages over time, leading to display quality degradation, and lack fingerprint recognition capabilities, resulting in complex and costly structures.
Innovation Solution
An OLED pixel circuit incorporating a touch fingerprint detection module and a compensation display module to detect touches and eliminate threshold voltage shifts, enabling multiple functions like touch control and fingerprint recognition with a simple and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensating circuit is added to eliminate threshold voltage shift, then display stability is improved, but device complexity increases
Solution Approach 1:
The patent combines the fingerprint sensing function and threshold voltage compensation function into a single integrated circuit structure. The sensing capacitor serves dual purposes: detecting fingerprint touches and compensating for threshold voltage shifts in the driving transistor, thereby eliminating the need for separate compensating circuits while maintaining display stability
Solution Approach 2:
The sensing capacitor is designed to perform multiple functions simultaneously: it acts as both a fingerprint detection element and a compensation element for the driving transistor. This multi-functional design reduces the overall number of components needed in the pixel circuit while ensuring reliable display operation
2Adaptability or versatility
If a separate fingerprint recognition circuit is added, then fingerprint recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent integrates the fingerprint sensing capability directly into the existing pixel circuit by utilizing the sensing capacitor and associated transistors that are already part of the display pixel structure, eliminating the need for separate fingerprint recognition circuits
Solution Approach 2:
The pixel circuit is designed to serve dual purposes: displaying visual information and detecting fingerprint touches. The same capacitor and transistor components used for display operation are repurposed for fingerprint sensing, achieving multi-functionality without additional circuitry
3Adaptability or versatility
If more components are added to the pixel circuit, then functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple functions (display, fingerprint sensing, threshold voltage compensation) into the existing pixel circuit components, avoiding the need to manufacture additional separate components and thereby reducing manufacturing costs
Solution Approach 2:
By designing components to perform multiple functions, the patent reduces the total number of components that need to be manufactured and assembled, leading to lower manufacturing costs while maintaining enhanced 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
The solution achieves stable display performance by eliminating threshold voltage shifts and integrates fingerprint recognition, enhancing the OLED pixel circuit's functionality while maintaining a straightforward and economical structure.
Implementation Method 1
An organic light-emitting diode display panel displays by relying on light emitted from an organic light-emitting diode
Data Source
AI summary
The present invention can solve the problem that an existing organic light-emitting diode pixel circuit has a single function or a complicated structure. An organic light-emitting diode pixel circuit of the present invention includes: a touch fingerprint detection module configured to detect whether a touch occurs or not and whether the touch is caused by a convex portion of a fingerprint or a concave portion of the fingerprint, and send a result of the detection to a read line, under the control of a first scanning signal and a second scanning signal; and a compensation display module including an organic light-emitting diode and at least one driving transistor, and configured to eliminate a shift of a threshold voltage of the driving transistor and drive the organic light-emitting diode to display under the control of at least the first scanning signal, the second scanning signal, and a data signal.