Dual Scan Driver Timing for Lower-Power Display Driving
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Solution Overview
Problem
Display devices face high power consumption due to the high frequency of clock signals required for scan drivers, which is not efficiently managed in existing technologies.
Innovation Solution
The display device employs a dual scan driver system with varying scan and emission clock signal cycles based on frame periods to optimize power consumption, where the frequency of clock signals is adjusted according to the type of frame, reducing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of clock signals is increased to improve scanning speed and image quality, then the display performance is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic clock signal frequency adjustment by providing different clock frequencies to first and second scan drivers. The first scan driver receives clock signals at a first frequency while the second scan driver receives clock signals at a second frequency, allowing the system to optimize between scanning speed and power consumption based on operational requirements.
Solution Approach 2:
The patent changes the frequency parameter of clock signals supplied to different scan drivers. By adjusting the frequency parameter differently for the first and second scan drivers, the system achieves optimized performance where faster scanning can occur where needed while reducing power consumption in other areas.
2Area of stationary object
If multiple scan drivers are used to increase scanning coverage, then the display area is expanded, but device complexity increases
Solution Approach 1:
The patent divides the scan driving function into multiple independent scan drivers (first scan driver and second scan driver), each responsible for different portions of the display. This segmentation allows the display area to be expanded while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces dynamic frequency control where different clock frequencies are supplied to different scan drivers. This dynamic approach allows the system to optimize performance and power consumption across the expanded display area without uniformly increasing complexity throughout the entire system.
Data Source
AI summary
A display device includes: a first pixel connected to a first data line and a first scan line; a second pixel connected to the first data line and a second scan line; a first scan driver connected to a first scan start line and the first scan line; and a second scan driver connected to a second scan start line and the second scan line. In first frame period, the second scan start line receives a second scan start signal having turn-on level, after a first period after a first scan start signal having turn-on level is supplied to the first scan start line. In second frame period, a difference between a time when the first scan start signal having turn-on level is supplied and a time when the second scan start signal having turn-on level is supplied corresponds to a second period that is shorter than the first period.