Micro-LED Display Circuit With Shared Compensation and Sensing
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Solution Overview
Problem
Conventional Micro-LED display devices require excessive external circuits and wires due to the need for threshold voltage and mobility compensation, as well as fingerprint recognition, leading to high complexity.
Innovation Solution
A display circuit design incorporating multiple pixel driving circuits, collection circuits, and a compensation circuit, where scan lines control the operation of transistors to share a single compensation circuit, reducing the number of external circuits and wires by alternating active and inactive voltage levels during compensation and collection phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate compensation circuits and collection circuits are used for threshold voltage compensation, mobility compensation, and fingerprint recognition, then each function can be independently implemented, but the number of external circuits and wires increases significantly
Solution Approach 1:
The patent combines the compensation circuit and collection circuit into a single integrated circuit structure. The same circuit performs both threshold voltage compensation and fingerprint recognition functions by controlling transistor switching states, thereby reducing the number of external circuits and wires while maintaining independent functionality of each operation
Solution Approach 2:
The integrated circuit is designed to perform multiple functions: threshold voltage compensation, mobility compensation, and fingerprint recognition. By using the same hardware circuit for multiple purposes through different operational modes and transistor control states, the patent eliminates the need for separate dedicated circuits for each function
2Adaptability or versatility
If multiple external circuits are used for compensation and fingerprint recognition, then all required functions can be implemented, but the number of wires and external connections increases
Solution Approach 1:
The patent merges multiple circuit functions into a single integrated circuit block within the pixel driving circuit. This integration allows threshold voltage compensation, mobility compensation, and fingerprint recognition to share the same physical circuit infrastructure, dramatically reducing the number of external wires and connections required
Solution Approach 2:
The integrated circuit is designed with multi-functionality to handle diverse operations including compensation and fingerprint recognition using the same hardware resources. This universal design approach maintains full functionality while minimizing the quantity of external wiring needed
3Device complexity
If a single integrated circuit is used for both compensation and collection functions, then circuit complexity is reduced, but control of transistor switching states must be precisely managed
Solution Approach 1:
The patent segments the operation timeline into distinct phases (compensation phase and collection phase) with different transistor switching states. During the compensation phase, specific transistors are activated for compensation operations, while during the collection phase, different transistors are activated for fingerprint recognition, allowing the same circuit to perform different functions at different times without interference
Solution Approach 2:
The circuit operates in periodic cycles, alternating between compensation mode and collection mode. By controlling the switching transistors to be in different on/off states during different time periods, the patent enables a single integrated circuit to sequentially perform multiple functions, reducing circuit complexity while maintaining operational clarity through time-division multiplexing
Data Source
AI summary
A display circuit includes a first control transistor and a second control transistor. A gate of the first control transistor is connected to a second scan line. A first electrode of the first control transistor is connected to an anode of a light-emitting device. A gate of the second control transistor is connected to a third scan line. A first electrode of the second control transistor is connected to a collection module. A reading signal line is connected to an ADC module, and second electrodes of the first and second control transistors of each pixel driving circuit. In a compensation stage, active levels are input into the first and second scan lines, and an inactive level is input into the third scan line. In a collection phase, an inactive level is input into the second scan line and an active level is input into the third scan line.