Pixel Driving Circuit With Non-Overlapping Compensation Timing
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Solution Overview
Problem
Existing pixel circuits face challenges in effectively compensating for the threshold voltage of driving transistors due to simultaneous operations with data voltage writing, leading to suboptimal performance, especially in high-frequency displays.
Innovation Solution
The pixel circuit design includes separate compensation and data writing phases, with non-overlapping scanning signals and additional control circuits to enhance threshold voltage compensation, utilizing energy storage and initialization circuits to improve compensation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compensation and data writing are performed simultaneously in existing pixel circuits, then the circuit operation speed is maintained, but the threshold voltage compensation effectiveness deteriorates
Solution Approach 1:
The patent divides the pixel circuit operation into distinct time phases: a compensation phase where threshold voltage compensation is performed, and a data writing phase where data voltage is written. These phases are separated by non-overlapping scanning signals, ensuring that compensation operations complete before data writing begins, thereby eliminating interference between the two processes while maintaining high-speed operation.
2Measurement precision
If separate compensation and data writing phases are implemented, then threshold voltage compensation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The patent designs scanning signals that serve multiple functions: they control both the timing separation between compensation and data writing phases, and they activate different circuit components during different phases. The first scanning signal controls data writing while the second scanning signal controls compensation, and these signals are designed to be non-overlapping to ensure proper phase separation without requiring additional control logic.
3Duration of action of moving object
If the effective enabling time period of the second scanning end is made longer, then threshold voltage compensation time is increased, but the overlap with the first scanning end must be avoided
Solution Approach 1:
The patent employs periodic scanning signals with specific timing characteristics. The second scanning signal has a longer effective enabling time period than the first scanning signal, creating a periodic compensation phase that extends beyond the data writing phase. This periodic structure ensures sufficient compensation time while maintaining clear phase separation through careful timing design where the extended compensation period does not overlap with the next data writing cycle.
Data Source
AI summary
The present disclosure provides a pixel circuit, a pixel driving method and a display device. The pixel circuit includes a light-emitting element, a driving circuitry, a first energy storage circuitry, a second energy storage circuitry, a data writing circuitry and a compensation control circuitry. The data writing circuitry writes a data voltage into a second node under the control of a first scanning signal from a first scanning end. The compensation control circuitry controls a first node to be electrically coupled to a second end of the driving circuitry under the control of a second scanning signal from a second scanning end. An effective enabling time period of the second scanning end does not overlap with, and has a length greater than, an effective enabling time period of the first scanning end.