LED Display Dimming Signal Arrangement for Flicker Reduction
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Solution Overview
Problem
Light emitting diode (LED) display devices experience flicker phenomena at low brightness levels due to their dimming methods, which are different from those of LCD display devices and result in non-uniform brightness.
Innovation Solution
A light emitting diode display device with a control module, first and second driving modules, and a dimming signal arranging method that groups frames into frame groups and averagely arranges dimming unit signals across these groups to minimize flicker, ensuring time intervals between adjacent dimming signals are optimized for uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dimming unit signals are sequentially arranged in frames to adjust brightness levels, then brightness control is achieved, but flicker phenomenon occurs at low brightness levels
Solution Approach 1:
The patent segments the working interval into multiple frame groups, each containing multiple frames. Dimming unit signals are distributed across different frame groups rather than sequentially arranged in single frames. This segmentation allows the LED to remain on longer within each frame group, reducing the flicker effect while maintaining brightness control capability.
Solution Approach 2:
The patent implements periodic action by organizing dimming unit signals into a regular pattern across multiple frame groups. Each frame group contains a specific number of frames with dimming signals arranged at predetermined positions, creating a periodic structure that reduces flicker perception. The time interval between adjacent dimming unit signals is controlled to be within a specific range, establishing a regular periodic pattern.
2Illumination intensity
If LED turn-on time is extended to adjust brightness at low levels, then brightness control is improved, but flicker phenomenon increases
Solution Approach 1:
The patent applies dynamics by making the dimming signal arrangement adaptive to different brightness levels. At low brightness levels, the system dynamically adjusts by distributing dimming unit signals across more frame groups with optimized time intervals, rather than using a fixed sequential arrangement. This dynamic adjustment allows the LED to maintain appropriate on-times without causing visible flicker.
Solution Approach 2:
The patent changes the parameter of time interval between adjacent dimming unit signals to a specific range (greater than the third time interval and less than or equal to the second time interval). This parameter optimization ensures that at low brightness levels, the extended LED on-time does not result in perceptible flicker, as the timing is carefully controlled within the specified range.
3Illumination intensity
If multiple dimming unit signals are arranged in sequential frames, then brightness levels are achieved, but brightness uniformity deteriorates
Solution Approach 1:
The patent segments the arrangement of dimming unit signals across multiple frame groups, ensuring that signals are distributed evenly rather than concentrated in sequential frames. This segmentation approach maintains consistent brightness levels by preventing excessive on-time accumulation in any single frame, thereby improving brightness uniformity across the display.
Solution Approach 2:
The patent achieves homogeneity by arranging dimming unit signals in a uniform pattern across frame groups. The time interval between adjacent dimming unit signals is standardized within a specific range, creating a homogeneous distribution pattern. This uniform arrangement ensures consistent brightness levels without the non-uniformity that occurs with sequential frame arrangement.
Data Source
AI summary
A dimming signal arranging method used for a light emitting diode display device is provided in the present disclosure. The dimming signal arranging method used for a light emitting diode display device includes the steps: determining whether a total number of dimming unit signals of a dimming signal is greater than a number of frames of a working interval; averagely arranging a first group of the dimming unit signals in at least one frame of the frame groups that is not a predetermined frame of each frame group; arranging a second group of the dimming unit group in at least one predetermined frame of the frame groups; and providing a dimming signal.