Display Driver Channel Subsets Reduce Flicker
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Solution Overview
Problem
High-resolution display devices face issues with flicker and uneven brightness due to the coupling effect between driving ICs, particularly at low grayscales, leading to visual flicker and inconsistent brightness across the display area.
Innovation Solution
A driving method that selectively enables different channel subsets in sub-frame subsets within a frame period, where each channel subset includes multiple driving channels, and determines if the grayscale is below a threshold to adjust channel activation, reducing mutual interference and improving brightness consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pulse width modulation (PWM) is used to drive LED at low grayscales, then brightness control is achieved, but visual flicker occurs due to long intervals between light-emitting events
Solution Approach 1:
The frame period is divided into multiple sub-frame periods, and each sub-frame is further divided into multiple grayscale periods. This segmentation allows the LED to emit light in multiple intervals within one frame period, reducing the interval between light-emitting events and eliminating visual flicker while maintaining PWM brightness control.
Solution Approach 2:
The patent implements periodic light-emitting actions by dividing the frame period into multiple sub-frames with regular intervals. Each sub-frame contains grayscale periods where LEDs emit light periodically, ensuring continuous visual perception and eliminating flicker effects.
2Manufacturing precision
If highly integrated driving IC is used to increase the number of driving channels, then display resolution is improved, but coupling effect causes interference between different driving ICs or channels leading to false lightening and uneven brightness
Solution Approach 1:
The patent segments the driving channels into different groups, with each group driven by a separate driving IC. By assigning non-adjacent channels to different ICs (e.g., odd channels to one IC, even channels to another), the patent reduces coupling effects between adjacent channels while maintaining high display resolution.
Solution Approach 2:
The patent introduces a channel allocation strategy as an intermediary mechanism that distributes driving channels across multiple ICs in a pattern that minimizes coupling. This allocation pattern acts as a mediator between the need for high integration and the need to reduce interference.
3Measurement precision
If more driving channels are activated simultaneously in each sub-frame, then grayscale precision is improved, but coupling effect increases causing more interference and uneven brightness
Solution Approach 1:
The patent segments the activation of driving channels across different sub-frames rather than activating all channels simultaneously. Each sub-frame activates a subset of channels, which reduces coupling effects while maintaining grayscale precision through the cumulative effect across multiple sub-frames.
Data Source
AI summary
The present disclosure relates to a driving method for a display device and a display device. The display device includes a display driver, the display driver includes a plurality of driving channels each of which drives corresponding display unit according to display data in a pulse width modulation manner within one frame period, the method comprises: selectively enabling, in each sub-frame subset among a plurality of different sub-frame subsets of the frame period, different channel subset among a plurality of channel subsets of the plurality of driving channels to drive corresponding display unit, wherein each channel subset of the plurality of channel subsets includes two or more driving channels among the plurality of driving channels.