Frame-Adaptive Pulse Width Modulation for Display Flicker Prevention
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Solution Overview
Problem
Conventional display panels suffer from brightness uniformity issues due to identical active pulse widths of light-emission control signals, leading to flicker phenomena.
Innovation Solution
Adjust the active pulse widths of light-emission control signals within refresh and maintenance frames by increasing or decreasing them to specific thresholds, ensuring equal brightness values across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identical active pulse widths are used for light-emission control signals, then the control signal structure is simple, but brightness uniformity deteriorates and flicker occurs
Solution Approach 1:
The patent applies local quality by differentiating pulse width parameters across different frame types. Refresh frames use a first pulse width parameter while maintenance frames use a second pulse width parameter, creating localized variations in signal characteristics to achieve uniform brightness without increasing overall system complexity
Solution Approach 2:
The patent implements dynamics by making the pulse width parameter adjustable based on frame type. The control signal dynamically adapts its active pulse width depending on whether it is a refresh frame or maintenance frame, allowing optimal brightness control for different display phases
2Illumination intensity
If active pulse width is increased in refresh frames, then brightness uniformity improves, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by alternating between different pulse width parameters in a structured sequence of refresh frames and maintenance frames. This periodic variation optimizes brightness uniformity during refresh operations while reducing energy consumption during maintenance periods, achieving a balanced energy profile
Solution Approach 2:
The patent uses partial action by applying increased pulse width only to refresh frames where it is most needed for brightness uniformity, while using reduced pulse width for maintenance frames. This selective application optimizes energy usage by avoiding excessive energy consumption during periods when full brightness is not required
3Use of energy by moving object
If active pulse width is decreased in maintenance frames, then energy consumption reduces, but brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by tailoring the pulse width parameter to the specific requirements of maintenance frames. By using a second pulse width parameter optimized for maintenance operations, the system achieves energy efficiency while maintaining adequate brightness uniformity for the maintenance phase
Solution Approach 2:
The patent implements dynamics by adapting the pulse width parameter to match the operational phase. The control signal dynamically switches to a reduced pulse width for maintenance frames, optimizing energy consumption while maintaining sufficient brightness uniformity for the maintenance function
Data Source
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AI summary
The present disclosure provides a pulse width modulation method, a pulse width modulation module and a display device. A display panel includes a pixel circuitry configured to receive a light-emission control signal and control a light-emitting element to emit light under the control of the light-emission control signal, and a display period includes a refresh frame and a maintenance frame. The pulse width modulation method includes: increasing at least one active pulse width of the light-emission control signal within the refresh frame so that the at least one active pulse width of the light-emission control signal is larger than a first active pulse width threshold; and/or decreasing at least one active pulse width of the light-emission control signal within the maintenance frame so that the at least one active pulse width of the light-emission control signal is less than a second active pulse width threshold. According to the present disclosure, it is able to prevent the occurrence of flicker.