Dual Scan Driving Circuit Layout for Low-Flicker Variable Refresh Displays
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Solution Overview
Problem
Display devices struggle with visibility issues when displaying images at varying refresh rates, particularly due to flickering caused by frequent frame transitions and inefficient power consumption.
Innovation Solution
A display device design incorporating a dual scan driving circuit with separate first and second scan lines and shift registers, controlled by a timing controller, to manage scan signals and reduce flickering by optimizing scan signal phases and periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frequent frame transitions are used to display images at high refresh rates, then image update speed is improved, but flickering and visibility issues worsen
Solution Approach 1:
The scan driving circuit is divided into two independent circuits: a first scan driving circuit for odd-numbered scan lines and a second scan driving circuit for even-numbered scan lines. This segmentation allows each circuit to operate independently with different timing, enabling the system to display images at high refresh rates while reducing flickering by staggering the scan operations across different circuits.
2Productivity
If frame transitions occur frequently, then image refresh rate is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic scan operations where the first and second scan driving circuits operate in alternating periods. The first circuit scans odd-numbered lines during one period, while the second circuit scans even-numbered lines during the same period. This periodic action allows the system to maintain high refresh rates by efficiently managing the timing and duration of active scanning, thereby reducing overall power consumption compared to continuous scanning approaches.
3Device complexity
If a single scan driving circuit is used for all scan lines, then device complexity is reduced, but visibility and flicker control worsen
Solution Approach 1:
The scan driving circuit is divided into two independent circuits: a first scan driving circuit for odd-numbered scan lines and a second scan driving circuit for even-numbered scan lines. This segmentation allows each circuit to operate independently with different timing, enabling the system to display images at high refresh rates while reducing flickering by staggering the scan operations across different circuits.
4Speed
If scan signals are outputted simultaneously for all scan lines, then scanning speed is improved, but flickering increases
Solution Approach 1:
The scan driving circuit is divided into two independent circuits: a first scan driving circuit for odd-numbered scan lines and a second scan driving circuit for even-numbered scan lines. This segmentation allows each circuit to operate independently with different timing, enabling the system to display images at high refresh rates while reducing flickering by staggering the scan operations across different circuits.
Solution Approach 2:
The patent implements periodic scan operations where the first and second scan driving circuits operate in alternating periods. The first circuit scans odd-numbered lines during one period, while the second circuit scans even-numbered lines during the same period. This periodic action allows the system to maintain high refresh rates by efficiently managing the timing and duration of active scanning, thereby reducing overall power consumption compared to continuous scanning approaches.
Data Source
AI summary
Provided herein may be a display device including: a display panel first scan lines, second scan lines, and pixels electrically connected to the first and second scan lines; a first scan driving circuit including a plurality of first shift registers each of which is configured to output a first scan signal to a corresponding first scan line and is configured to be reset by a first reset signal; a second scan driving circuit including a plurality of second shift registers each of which is configured to output a second scan signal to a corresponding second scan line and is configured to be reset by a second reset signal; and a timing controller configured to respectively output the first reset signal and the second reset signal through different signal lines. The display device may be improved in visibility so that images can be displayed at various refresh rates.