Alternating Dot Scan Driver for Flicker-Free Low-Frequency Display
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Solution Overview
Problem
Display devices experience flicker when switching from high to low frequency or when displaying specific patterns during low-frequency driving, leading to visual recognition issues.
Innovation Solution
A display device configuration with alternately disposed dots connected to scan lines, a scan driver with specific stage connections, and a data driver that applies scan and clock signals in synchronized phases to maintain consistent luminance, preventing flicker recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates at low frequency to save power, then power consumption is reduced, but flicker occurs during specific pattern display
Solution Approach 1:
The scan driver is divided into multiple stages that sequentially activate different groups of pixels (first dots and second dots) in alternating patterns. This segmentation allows the display to maintain stable luminance perception by ensuring that adjacent pixels are updated in a staggered manner, preventing simultaneous luminance changes that cause flicker during low-frequency operation.
Solution Approach 2:
The patent implements periodic scanning where first dots and second dots are alternately activated in a regular cycle. This periodic action creates a consistent luminance variation pattern that the human visual system perceives as stable, even at low refresh frequencies, thereby eliminating flicker while maintaining power savings.
2Use of energy by moving object
If the display frequency is switched from high to low frequency, then power consumption is reduced, but visual recognition of flicker occurs due to changed luminance decrease cycle
Solution Approach 1:
The pixel array is segmented into first dots and second dots that are scanned alternately by different stages of the scan driver. This segmentation ensures that when the display operates at low frequency, the luminance changes of adjacent pixels are temporally separated, preventing the human visual system from detecting the flicker that would otherwise occur during frequency transitions.
Solution Approach 2:
Different regions of the display (first dots vs. second dots) are updated with different timing characteristics. This local quality differentiation ensures that luminance changes are distributed unevenly across the display surface in time, preventing synchronized luminance drops that would be perceived as flicker during low-frequency operation.
Data Source
AI summary
A display device includes first dots connected to first scan lines, second dots connected to second scan lines and alternately disposed with the first dots in a first direction and a second direction different from the first direction, a scan driver including first stages respectively connected to the first scan lines and second stages respectively connected to the second scan lines, and a data driver connected to the first dots and the second dots through data lines. The first stages are connected to first clock lines, the second stages are connected to second clock lines, first stages except a first start stage are respectively connected to corresponding first scan lines of corresponding previous first stages, and second stages except a second start stage are respectively connected to corresponding second scan lines of corresponding previous second stages.