Pixel Circuit Reset Module for LED Display Transistor Stability
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Solution Overview
Problem
In micro-diode and sub-millimeter LED display panels, the high driving current causes temperature rise and directional electron accumulation in driving transistors, leading to stability issues, characteristic drift, and display problems like 'mura' and residual images, which degrade the display quality.
Innovation Solution
A pixel circuit with a data writing module, driving transistor, light-emitting control module, initialization modules, and a reset module is designed to manage electron flow and voltage levels, ensuring that the voltage of the second terminal of the driving transistor is greater than or equal to the first terminal during specific stages to counteract electron accumulation and drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large driving current is used to drive micro-diodes or sub-millimeter LEDs, then the light-emitting performance is improved, but the temperature of the driving transistors rises and electron accumulation occurs, leading to stability degradation and characteristic drift
Solution Approach 1:
The patent applies preliminary action by performing initialization of the driving transistor before the light-emitting stage. The initialization module sets the voltage of the second terminal to be greater than or equal to the voltage of the first terminal before driving current flows, preventing electron accumulation from occurring in the first place. This preparatory voltage configuration ensures that when large driving current is subsequently applied for high illumination intensity, the transistor remains stable without characteristic drift.
2Illumination intensity
If a large driving current is used to drive micro-diodes or sub-millimeter LEDs, then the light-emitting performance is improved, but heat generation increases, affecting display quality
Solution Approach 1:
The patent uses preliminary action by configuring the voltage state of the driving transistor before the light-emitting phase. By setting the second terminal voltage to be greater than or equal to the first terminal voltage through the initialization module, electrons are prevented from accumulating and generating excessive heat during high-current operation. This preparatory voltage configuration enables high illumination intensity while controlling heat generation and maintaining display quality.
Data Source
AI summary
A pixel circuit, a method for driving a pixel circuit and a display panel are provided. An exemplary pixel circuit includes a data writing module and a driving transistor, a voltage of a first terminal of the driving transistor being greater than a voltage of a second terminal; a light-emitting control module and a light-emitting device, the light-emitting device being configured to emit light in response to the driving current generated by the driving transistor; a first initialization module and a second initialization module; and a reset module configured to cause the voltage of the second terminal of the driving transistor to be greater than or equal to the voltage of the first terminal of the driving transistor in response to a current-stage reset signal, an enable signal of the current-stage reset signal appearing after an enable signal of the current-stage light-emitting signal.