Pixel Circuit Gate Reset and Electrode Initialization for Flicker Suppression
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Solution Overview
Problem
Display panels using light-emitting diodes face flicker issues due to threshold voltage shifts in driving transistors, affecting display quality, especially at high and low gray scales and varying refresh frequencies.
Innovation Solution
A pixel circuit with control circuits to manage leakage currents and initialize electrodes, including a first control circuit to reduce leakage current, a second control circuit to initialize electrodes, and a third control circuit to reset and control data voltage, ensuring stable operating currents for the light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional pixel circuit is used to drive light-emitting diodes, then the display apparatus achieves self-illumination and low energy consumption, but threshold voltage shifts in driving transistors cause flicker issues affecting display quality
Solution Approach 1:
The pixel circuit performs preliminary actions by initializing the first setting electrode before the light-emitting device emits light, and resetting the gate of the driving transistor before data voltage is input. These preliminary actions prevent threshold voltage shifts and leakage currents that would otherwise cause flicker, ensuring display quality stability while maintaining the energy-efficient LED driving function
2Reliability
If the gate of the driving transistor is reset and data voltage is controlled, then the driving transistor generates stable operating current, but leakage current at the gate affects display quality
Solution Approach 1:
The invention extracts and separately controls the leakage current issue by introducing a first control circuit specifically dedicated to reducing leakage current at the gate of the driving transistor. This separate control mechanism allows the gate to be reset and data voltage to be controlled for stable operating current generation, while simultaneously addressing the harmful leakage current that would otherwise affect display quality
3Reliability
If control circuits are added to manage leakage currents and initialize electrodes, then flicker problems are alleviated, but the pixel circuit complexity increases
Solution Approach 1:
The control circuits in the pixel circuit are designed with multi-functionality to minimize complexity. The first control circuit reduces leakage current while the second control circuit initializes the first setting electrode, and the third control circuit manages gate reset and data voltage input. These circuits perform multiple functions within a unified structure, alleviating flicker problems across different gray scales and refresh frequencies while keeping the overall pixel circuit complexity manageable
Data Source
AI summary
A pixel circuit, a method for driving the same, a display panel and a display apparatus, the pixel circuit includes: a light-emitting device; a driving transistor coupled to the light-emitting device; a first control circuit coupled to a gate of the driving transistor; a second control circuit coupled to a first setting electrode of the driving transistor and configured to initialize the first setting electrode of the driving transistor before the light-emitting device is driven to emit light; a third control circuit coupled to the driving transistor and configured to reset the gate of the driving transistor, control the data voltage to be input into the gate of the driving transistor, and control the driving transistor to generate an operating current according to a data voltage to drive the light-emitting device to emit light.