Display Control Method for Flickering Reduction via Pulse Width Compensation
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Solution Overview
Problem
Display panels using low refresh frequencies experience flickering due to current leakage in transistors, leading to fluctuations in display brightness and poor user experiences.
Innovation Solution
A display control method that involves a driving chip transmitting a compensated emission start signal to cascaded emission control driving circuits, which output emission control signals to adjust the pulse widths of pulses corresponding to non-display phases, thereby adjusting the display duration and brightness of light-emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low refresh frequency is used to reduce power consumption, then energy efficiency is improved, but display brightness stability deteriorates due to current leakage causing flickering
Solution Approach 1:
The patent applies preliminary action by compensating for current leakage effects in advance through adjusted pulse width compensation values. The driving chip calculates compensation values based on expected current leakage characteristics and applies them before the actual display refresh, thereby pre-correcting the brightness uniformity issue that would otherwise occur during the frame period at low refresh frequencies
Solution Approach 2:
The patent changes the pulse width parameter of emission control signals dynamically. By adjusting the pulse width compensation values based on current leakage characteristics, the system modifies the duration of emission control signals to compensate for brightness fluctuations, thereby maintaining display brightness stability while operating at low refresh frequencies
2Use of energy by stationary object
If low refresh frequency is used, then power consumption is reduced, but flickering becomes observable affecting user experience
Solution Approach 1:
The patent converts the harmful effect of current leakage into a beneficial compensation mechanism. By measuring and calculating pulse width compensation values based on current leakage characteristics, the system transforms what would be a source of flickering into a corrective parameter that eliminates the harmful effect while maintaining low refresh frequency operation
3Reliability
If pulse widths of first pulses are adjusted to compensate for current leakage, then display brightness uniformity is improved, but signal complexity increases
Solution Approach 1:
The driving chip performs self-service by autonomously calculating and applying pulse width compensation values without requiring external intervention or complex external control systems. The chip uses its own processing capabilities to determine compensation values based on current leakage characteristics and directly adjusts the emission control signals, thereby improving brightness uniformity while avoiding additional system complexity
Data Source
AI summary
The present invention provides a display control method of a display panel, a display module, and a display device. Pulse widths of first pulses corresponding to non-display phases in one frame period in an emission start signal are at least partially different, so that pixel driving circuits adjust light-emitting durations of light-emitting devices corresponding to each display phase according to emission control signals. Accordingly, a display brightness of each light-emitting device can be adjusted within one frame period, and a flickering problem can be alleviated.