Composite Driving Circuit With Shared Enable Lines for Optical Detection
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Solution Overview
Problem
The complexity of driving circuits in optical fingerprint recognition display panels is increased due to separate pixel and fingerprint recognition circuits, leading to complications in design and potential reductions in display panel efficiency.
Innovation Solution
A composite driving circuit is introduced, combining pixel and optical detection driving functions, with transistors configured to operate based on enable signals, allowing shared wiring and reduced space usage, thereby optimizing circuit layout and maintaining display panel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate pixel driving circuit and fingerprint recognition circuit are provided, then optical fingerprint recognition function is achieved, but driving circuit complexity increases
Solution Approach 1:
The patent combines the pixel driving circuit and optical detection driving circuit into a single composite driving circuit. The pixel driving circuit includes a driving transistor and a first light-emitting control transistor, while the optical detection driving circuit includes an output control transistor. These circuits share common wiring resources such as the enable signal line group, reducing the overall circuit complexity while maintaining both display and optical fingerprint recognition functions.
Solution Approach 2:
The composite driving circuit is designed to perform multiple functions: it controls both the light-emitting element for display purposes and the photodetector for optical fingerprint recognition. The enable signal line group serves both circuits simultaneously, and the transistors are configured to respond to the same enable signal, allowing one circuit structure to fulfill multiple operational roles.
2Area of stationary object
If composite driving circuit shares wiring resources, then space usage is reduced, but wiring constraints increase
Solution Approach 1:
The composite driving circuit merges the pixel driving circuit and optical detection driving circuit to share common wiring resources. The enable signal line group is shared by both the first light-emitting control transistor and the output control transistor. This consolidation reduces the total wiring area and space requirements while the patent manages wiring constraints through careful transistor configuration and signal timing.
3Ease of operation
If transistors operate based on same enable signal, then circuit operation is simplified, but crosstalk risk increases
Solution Approach 1:
The patent employs periodic action by using the enable signal to alternately control the first light-emitting control transistor and the output control transistor. During the display period, the first light-emitting control transistor is turned on while the output control transistor is turned off. During the optical detection period, the opposite occurs. This time-division multiplexing approach simplifies circuit operation while effectively preventing crosstalk between the two functional circuits.
Data Source
AI summary
A composite driving circuit and a display panel are provided. The display panel comprises a plurality of composite driving circuits and comprises a light-emitting element and a photodetector, which are driven by the composite driving circuits. The display panel comprises a plurality of row partitions, which are sequentially arranged in a column direction, wherein each row partition is provided with an enable signal line group for applying the same enable signal. The composite driving circuits and the photodetector, which is driven by the composite driving circuits, are respectively located in different row partitions.