Pixel Driving Circuit With Capacitor Resetting for TFT Afterimage Reduction
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Solution Overview
Problem
The hysteresis phenomenon in TFT devices of display panels causes afterimage issues due to varying bias voltages during picture transitions, affecting user experience.
Innovation Solution
A pixel driving circuit with additional control signal leads and transistors is introduced to forcibly bias the threshold voltage of driving transistors, ensuring consistent voltage levels across all pixels, reducing hysteresis and afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TFT devices are used in display panels, then the display can show various pictures, but hysteresis phenomenon occurs due to varying bias voltages during picture transitions, causing afterimage issues
Solution Approach 1:
The patent applies preliminary action by resetting the capacitor to a reference voltage before data writing occurs. This preliminary resetting action ensures that the driving transistor starts from a known state, eliminating residual bias voltage effects from previous pictures and preventing hysteresis-induced afterimages while maintaining picture switching capability
Solution Approach 2:
The patent changes the voltage parameter of the capacitor from a residual state to a reference voltage state through the resetting operation. This parameter change ensures consistent starting conditions for each picture display cycle, eliminating the varying bias voltages that cause hysteresis and afterimage phenomena
2Reliability
If a capacitor resetting stage is added to reduce hysteresis, then afterimage phenomenon is improved, but the circuit complexity increases with additional control signal leads and transistors
Solution Approach 1:
The patent makes the control signal lead serve multiple functions: it controls both the resetting operation and the data writing operation. This multi-functionality reduces the need for separate control signals, thereby limiting the increase in circuit complexity while achieving afterimage reduction through the resetting stage
Data Source
AI summary
The present disclosure provides a pixel driving circuit, a display panel and a driving method of the pixel driving circuit. The pixel driving circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a sixth transistor, a driving transistor, a first capacitor and a fifth transistor. A gate electrode of the fifth transistor is coupled to a third input terminal, the third input terminal is coupled to a third control signal lead, and the third control signal lead maintains a low level in both the triggering sub-stage and the maintaining sub-stage of the capacitor resetting stage. The present disclosure can reduce the hysteresis of the driving transistor and improve the afterimage phenomenon of a display screen.