Pixel Driving Circuit for AMOLED Flicker Reduction
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Solution Overview
Problem
Existing pixel driving circuits in AMOLED display devices experience current leakage at low frequencies, leading to flickering during display due to the gate electrode of the driving transistor, which affects display quality and power consumption.
Innovation Solution
A pixel driving circuit with a specific configuration including a driving sub-circuit, storage sub-circuit, power control sub-circuit, data writing-in sub-circuit, compensation sub-circuit, and reset sub-circuit, which controls the connection and disconnection of the gate electrode and common node under different voltage inputs to maintain the potential of the gate electrode during the light-emitting period, reducing current leakage and flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pixel driving circuit is driven at a low frequency, then power consumption is reduced, but the gate electrode of the driving transistor experiences serious current leakage causing display flicker
Solution Approach 1:
The patent applies preliminary action by pre-charging the gate electrode of the driving transistor to a specific voltage level before the light-emitting period begins. The reset transistor activates during a reset period to charge the gate electrode through the initialization voltage input terminal, ensuring the gate electrode is ready to maintain stable potential during subsequent low-frequency light-emitting periods, thereby preventing current leakage and flicker while reducing power consumption.
Solution Approach 2:
The patent changes the voltage parameter of the gate electrode dynamically. By controlling the reset transistor to adjust the gate electrode voltage to a specific level (higher than the threshold voltage) before light emission, and maintaining this voltage level during low-frequency operation, the circuit achieves stable display performance with reduced power consumption. The voltage parameter modification prevents the current leakage issue that causes flicker.
2Loss of energy
If the gate electrode potential is maintained during light-emitting period, then current leakage is reduced, but additional control circuits are required
Solution Approach 1:
The patent makes the reset transistor serve multiple functions: it acts as a switch to charge the gate electrode during the reset period, and also functions as a control element to maintain the gate electrode potential during the light-emitting period. By integrating these functions into a single transistor controlled by the reset control signal, the circuit reduces current leakage without significantly increasing overall circuit complexity.
Solution Approach 2:
The gate electrode maintains its own potential through the action of the reset transistor and the initialization voltage input terminal. During the light-emitting period, the reset transistor remains in a state that allows the gate electrode to self-maintain its voltage level without requiring additional active control circuits. The circuit structure enables the gate electrode to service itself by maintaining stable potential, reducing the need for extra components.
Data Source
AI summary
The present disclosure provides a pixel driving circuit, a method for driving the same, and a display device. A first reset sub-circuit included in the pixel driving circuit is used to control to connect or disconnect a gate electrode of a driving transistor and a common node, and to connect or disconnect the common node and the first initialization voltage input terminals; control to connect or disconnect the common node and a second initialization voltage input terminal under the control of a first control terminal; a difference between a potential of a second initialization signal inputted by the second initialization signal input terminal and a potential of a gate electrode of the driving transistor during a light emission period is smaller than a threshold value.