Pixel Circuit Bias Control for Low-Frequency Flicker Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low-frequency driving in display technology leads to flickering due to differences in brightness between refreshing and maintenance frames caused by strong bias processes on driving transistors, which affect the light-emitting current.
Innovation Solution
A pixel circuit with a control circuit that controls the voltage difference between the gate and electrode potentials of the driving transistor to be less than a threshold value before data writing, using reference voltage writing, compensation, and on-off control circuits to maintain a diode connection state, thereby reducing the impact of strong bias.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency driving is used to reduce power consumption and improve battery life, then energy efficiency is improved, but flickering occurs due to brightness differences between refreshing and maintenance frames
Solution Approach 1:
The patent applies preliminary anti-action by implementing a control circuit that preemptively regulates the voltage difference between gate electrode and electrode before the strong bias process occurs in the refreshing frame. By controlling the absolute value of the voltage difference to be less than a threshold value in advance, the patent prevents the brightness inconsistency that would otherwise cause flickering, thus eliminating the harmful effect before it manifests.
2Ease of operation
If strong bias process is applied to driving transistor in refreshing frame, then data writing is enabled, but light-emitting current becomes low causing brightness difference and flickering
Solution Approach 1:
The patent implements feedback control by using a control circuit that continuously monitors and regulates the voltage difference between the gate electrode and electrode of the driving transistor. The control circuit adjusts the voltage levels based on the threshold value to ensure the absolute voltage difference remains controlled, providing feedback that maintains consistent light-emitting current across both refreshing and maintenance frames while still enabling data writing.
3Productivity
If voltage difference between gate electrode and electrode is not controlled, then data writing can proceed normally, but brightness inconsistency occurs leading to flicker visibility
Solution Approach 1:
The patent applies parameter changes by introducing a threshold value parameter that defines the maximum acceptable voltage difference between the gate electrode and electrode. The control circuit modifies the voltage parameters dynamically to ensure the absolute voltage difference remains below this threshold during the first phase of the refreshing frame, thereby maintaining productivity while reducing flicker visibility through controlled parameter adjustment.
Data Source
AI summary
A pixel circuit, a driving method and a display device are provided. The pixel circuit includes a driving transistor and a control circuit; the control circuit is electrically connected to a gate electrode of the driving transistor. The control circuit is configured to, in a refreshing frame, in a first phase arranged before a data writing phase, control an absolute value of a difference between a potential of the gate electrode of the driving transistor and a potential of the electrode of the driving transistor to be less than a voltage difference threshold; the electrode comprises a first electrode of the driving transistor and/or a second electrode of the driving transistor.