LTPS Pixel Circuit Reset Mechanism for Current Leakage
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Solution Overview
Problem
Low temperature polysilicon (LTPS) display panels face current leakage issues due to transistor characteristics, affecting display quality, especially at low frequencies.
Innovation Solution
A pixel circuit design incorporating a first reset circuit and a driving circuit, with transistors connected to specific control lines and voltage lines, allowing for controlled voltage writing and connection management under various control signals, including a refresh and maintenance reset phase, to address current leakage and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If LTPS transistors are used to achieve high switching speed, then the display panel can meet high switching speed requirements, but current leakage problems occur due to transistor characteristics
Solution Approach 1:
The patent applies preliminary action by introducing a reset circuit that writes reset voltage to the driving circuit before the light emitting phase. This reset operation, controlled by the reset control signal, proactively clears accumulated charge and prevents current leakage before it affects display quality, rather than waiting for leakage problems to manifest
Solution Approach 2:
The patent changes the voltage parameter by introducing a specific reset voltage through the reset voltage line. This voltage parameter modification allows the driving circuit to be reset to a known state, counteracting the current leakage inherent in LTPS transistors while maintaining their high switching speed characteristics
2Speed
If LTPS transistors are used to achieve high switching speed, then the display panel can meet high switching speed requirements, but display effect deteriorates in the low frequency display field
Solution Approach 1:
The reset circuit performs preliminary action by preparing the driving circuit in advance through voltage writing before each light emitting phase. This ensures the circuit is in an optimal state for both high-speed switching and low-frequency display operations, preventing display quality deterioration
Solution Approach 2:
The patent implements a feedback mechanism where the reset control signal monitors the state of the driving circuit and triggers reset voltage writing when needed. This feedback loop ensures the driving circuit maintains proper operation across different display frequencies, improving overall display effect reliability
Data Source
AI summary
The present disclosure provides a pixel circuit, a driving method and a display device. The pixel circuit includes a first reset circuit and a driving circuit, the first reset circuit is respectively electrically connected to a first light emitting control line, a reset control line, a first reset voltage line and a first end of the driving circuit, and is configured to write a first reset voltage provided by the first reset voltage line into the first end of driving circuit under the control of a first light emitting control signal provided by the first light emitting control line and a reset control signal provided by the reset control line; the driving circuit is configured to connect the first end of the driving circuit and a second end of the driving circuit under the control of a potential of a control end of the driving circuit.