Display Driving Method Reducing Flicker via Spatial Scattering
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Solution Overview
Problem
Digital driving methods in self-luminous display devices, such as OLED, mini-LED, and micro-LED, suffer from flicker issues, particularly noticeable in low grayscale, which existing solutions attempt to mitigate by increasing hardware driving frequency and adding sub-frames, making hardware implementation difficult and costly.
Innovation Solution
A method of driving a display device by dividing sub-pixels into groups and rearranging the display order of sub-frames with different time weights, allowing sub-pixels in odd and even rows to display in specific sequences, effectively reducing flicker without increasing driving frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If grayscale scattering method is used to split low-weight sub-frames into smaller sub-frames, then flicker problem is solved, but hardware driving frequency needs to be increased making implementation difficult and costly
Solution Approach 1:
The pixel array is segmented into multiple scanning regions (e.g., odd rows and even rows) that are driven independently with different sub-frame sequences. This spatial segmentation allows different regions to display different sub-frames at different times, eliminating the need to increase overall driving frequency while still achieving flicker reduction through temporal distribution of sub-frames.
Solution Approach 2:
The solution transitions from temporal dimension (increasing driving frequency over time) to spatial dimension (differentiating driving sequences across different scanning regions). By applying different sub-frame display sequences to different spatial regions simultaneously, the patent achieves flicker reduction without temporal frequency multiplication.
2Illumination intensity
If digital driving method with sub-frames is used, then brightness control is achieved, but flicker problems occur during display especially in low grayscale
Solution Approach 1:
The patent implements periodic sub-frame sequences with different time weights (e.g., 1:2:4:8 ratios) distributed across scanning regions. This periodic structure maintains average brightness while distributing light emission over time periods that are imperceptible to human vision, thereby eliminating flicker while preserving brightness control.
Solution Approach 2:
Different scanning regions are assigned different sub-frame display sequences tailored to their local characteristics. For example, odd rows may use one sequence while even rows use another, allowing localized optimization of brightness and flicker reduction without affecting the entire display uniformly.
Data Source
AI summary
The present invention provides a method of driving a display device, comprising the steps of: step S1, providing a display device, comprising a plurality of sub-pixels arranged in an array; step S2: dividing data signals of the sub-pixels in a frame of an image into a plurality of sub-frames having different time weights; step S3, dividing the plurality of sub-pixels into at least two driving groups, and the plurality of sub-frames corresponding to the sub-pixels in different driving groups having different display order; and step S4, driving each of the sub-pixels to display image according to a display order of one of the sub-frames corresponding to each of the sub-pixels, such that through setting different display order of sub-frames of the sub-pixels of different driving groups, the flicker caused by the digital driving can be reduced without increasing driving frequency.