Pixel Circuit Pulse Control for Low-Frequency Flicker Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pixel circuits in display devices experience significant flickering issues due to leakage currents causing variance in gate voltage of driving transistors under low frequency driving, leading to poor display quality.
Innovation Solution
A pixel circuit comprising a light-emitting device, a driving module, and a light-emitting control module connected in series, where the control module turns off the light-emitting device using pulse signals set according to the luminance waveform spectrum, reducing low-frequency luminance components to alleviate flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pixel circuit is used with continuous light-emitting, then the light-emitting device maintains stable luminance, but leakage current causes gate voltage change resulting in flicker under low frequency driving
Solution Approach 1:
The patent applies periodic action by dividing the light-emitting process into multiple discrete light-emitting sub-periods within each frame period. The light-emitting control transistor periodically switches between conducting and non-conducting states, creating intermittent light emission rather than continuous emission. This periodic control prevents the accumulation of leakage current effects that cause flicker, while maintaining acceptable display quality through controlled light emission cycles.
2Use of energy by moving object
If light-emitting device operates at low refresh frequency, then power consumption is reduced, but leakage current causes significant luminance variance and flicker
Solution Approach 1:
The patent segments the light-emitting process by dividing each frame period into multiple light-emitting sub-periods separated by non-emission intervals. This segmentation allows the light-emitting control transistor to periodically turn off, preventing leakage current accumulation that would otherwise cause luminance variance. The segmented approach maintains luminance stability while operating at low refresh frequencies, as each sub-period can be independently controlled to minimize leakage effects.
3Illumination intensity
If continuous light emission is maintained, then display brightness is sustained, but leakage current changes gate voltage causing luminance variance
Solution Approach 1:
The patent implements periodic action by controlling the light-emitting transistor to switch between conducting and non-conducting states at regular intervals within each frame period. This periodic switching prevents continuous light emission, thereby preventing leakage current from continuously charging the gate capacitor and changing the gate voltage. The periodic control maintains gate voltage stability while still providing sufficient display brightness through controlled light emission periods.
Solution Approach 2:
The patent applies dynamics by making the light-emitting control transistor switchable between different states (conducting and non-conducting) based on control signals. This dynamic control allows the system to adjust the light emission timing and duration, preventing the static continuous emission that causes leakage current accumulation. The dynamic switching maintains gate voltage stability while preserving display brightness through adaptive light emission control.
Data Source
AI summary
Embodiments of the present disclosure are directed to a pixel circuit and a driving system. The pixel circuit comprises a light-emitting device, a driving module connected to the light-emitting device, and a light-emitting control module. The driving module drives the light-emitting device to emit light. The light-emitting control module is connected to the driving module. The light-emitting control module, the light-emitting device and the driving module are all connected in series between a first power supply signal and a second power supply signal. A control end of the light-emitting control module receives a light-emitting control signal. The light-emitting control signal includes at least one pulse signal. The light-emitting control module turns off the light-emitting device in response to the pulse signal which is set according to a spectrum of a luminance waveform of a frame period.