Dual-Mode Pixel Circuit Timing for Stable Display Current
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Solution Overview
Problem
Existing display panels face challenges in achieving multi-functional display capabilities due to instability in driving transistors caused by threshold voltage drift, affecting display quality and adaptability to different application scenarios.
Innovation Solution
The display panel incorporates a pixel circuit with a driving module and signal conditioning module, featuring a non-light-emitting period with signal conditioning phases, and operates in multiple modes to adjust the duration of non-light-emitting periods and signal conditioning phases, including a bias conditioning module to stabilize the driving transistor and enhance display effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel circuit uses a conventional driving transistor without signal conditioning, then the device complexity is reduced, but the driving current becomes unstable due to threshold voltage drift
Solution Approach 1:
The signal conditioning module performs preliminary conditioning on the gate signal before it reaches the driving transistor. By pre-adjusting the signal parameters (voltage level, pulse width) in the non-light-emitting period, the driving transistor receives an optimized signal that compensates for threshold voltage drift, thereby stabilizing the driving current without requiring complex real-time correction circuits.
Solution Approach 2:
The pixel circuit operates in dual modes with dynamic parameter adjustment: in the first mode (Ld1>Ld2), the non-light-emitting period of the data writing frame is extended to allow more time for signal conditioning and compensation; in the second mode (Lm1>Lm2), the holding frame non-light-emitting period is extended. This dynamic adaptation to different operating conditions enables the circuit to maintain driving current stability while managing complexity through mode-based parameter optimization rather than continuously complex control logic.
2Adaptability or versatility
If the pixel circuit operates in a single mode with fixed timing, then the device complexity is reduced, but the adaptability to different application scenarios (gaming, reading) is limited
Solution Approach 1:
The pixel circuit is designed with dual-mode operation capability, where a single circuit structure can adapt to different application scenarios by switching between two predefined timing modes. The first mode (with Ld1>Ld2) optimizes for scenarios requiring longer data writing time, while the second mode (with Lm1>Lm2) optimizes for scenarios requiring longer holding time. This universal design allows the same hardware to serve multiple functions without requiring separate dedicated circuits for each application scenario.
Solution Approach 2:
The circuit achieves adaptability through parameter changes rather than structural changes. By modifying the duration parameters of the non-light-emitting period in different frames (data writing frame vs. holding frame), the system can adapt to different refresh rates and display modes. The control logic switches between predefined parameter sets (mode 1 and mode 2) based on application needs, providing versatility without requiring complex real-time parameter optimization or additional hardware components.
3Reliability
If the non-light-emitting period duration is extended to improve signal conditioning, then the driving transistor stability is improved, but the light-emitting period duration is reduced
Solution Approach 1:
The frame time is segmented into distinct functional periods: non-light-emitting period (containing signal conditioning phase) and light-emitting period. By separating these functions into distinct time segments, the signal conditioning can be performed thoroughly during the non-light-emitting period without encroaching on the light-emitting period. The segmentation allows each phase to be optimized independently: sufficient time for signal conditioning in the non-light-emitting period while preserving adequate light-emitting duration for display performance.
Solution Approach 2:
The pixel circuit operates with periodic timing patterns, where signal conditioning occurs periodically during the non-light-emitting period before each light-emitting period. This periodic action allows the signal to be conditioned at regular intervals, ensuring the driving transistor is properly prepared for each light-emitting phase. The rhythmic alternation between conditioning and light-emitting phases enables stable driving current while maintaining sufficient light output duration, as the conditioning happens in advance during the periodic non-light-emitting intervals.
Data Source
AI summary
The present disclosure provides a display panel and a display device. A pixel circuit in the display panel is operable in any one of the first mode and the second mode. A duration Ld1 of a non-light-emitting period of a data writing frame in the first mode, a duration Lm1 of the non-light-emitting period of a holding frame in the first mode, a duration Ld2 of the non-light-emitting period of the data writing frame in the second mode, and a duration of the non-light-emitting period of the holding frame in the second mode are flexibly adjusted according to a relationship of Ld1>Ld2, and/or, Lm1>Lm2, and durations of the non-light-emitting periods in the data writing frame and the holding frame are optimized to ensure good display effects of the display panel in different modes.