Display Device Scan Driving Circuit Frequency Control
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption, particularly when displaying multiple images, as they require continuous driving of all pixels regardless of image content, leading to inefficiencies in energy usage.
Innovation Solution
The display device employs a dual-frequency operation mode, where the first display region is driven at a normal frequency and the second display region is driven at a lower frequency, allowing pixels in the second region to remain inactive during certain frames, thereby reducing power consumption. This is achieved through a driving controller that manages two scan driving circuits, each operating on different frequencies and activating scan lines corresponding to specific regions of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all pixels are driven continuously at normal frequency to display multiple images, then image display capability is maintained, but power consumption increases
Solution Approach 1:
The display panel is divided into multiple display regions, each with independent scan driving circuits that can operate at different frequencies. This allows selective driving of different regions at different refresh rates, enabling the system to maintain image display capability while reducing overall power consumption by lowering frequencies in regions that don't require high refresh rates.
Solution Approach 2:
The scan driving circuits are designed to dynamically adjust their operating frequencies based on the display requirements of different regions. The driving controller can selectively activate scan driving circuits at normal frequency or low frequency modes, allowing the system to adapt its power consumption to the actual display needs of each region.
2Reliability
If scan driving circuits operate at normal frequency, then image refresh quality is maintained, but power consumption increases
Solution Approach 1:
Different display regions are assigned different quality levels based on their specific requirements. Regions that require high image refresh quality continue to operate at normal frequency, while other regions operate at lower frequencies. This local differentiation allows the system to maintain necessary image quality in critical areas while reducing overall power consumption.
3Adaptability or versatility
If multiple scan driving circuits are used for different display regions, then selective frequency control is achieved, but device complexity increases
Solution Approach 1:
Multiple scan driving circuits are integrated into a unified structure under the control of a single driving controller. The driving controller manages multiple scan driving circuits and can selectively activate them at different frequencies, combining the functionality of multiple independent circuits while maintaining centralized control to minimize overall system complexity.
Data Source
AI summary
A display device includes a driving controller which provides a first start signal and a second start signal corresponding to an operation mode to a scan driving circuit. The scan driving circuit includes a first scan driving circuit having first dummy driving stages and first driving stages which sequentially drive scan lines corresponding to a first display region among a plurality of scan lines in synchronization with the first start signal and a second scan driving circuit having second dummy driving stages and second driving stages which sequentially drive scan lines corresponding to a second display region among the plurality of scan lines in synchronization with the second start signal. The first dummy driving stages are disposed on a first side surface of the display panel and the second dummy driving stages are disposed on a second side surface of the display panel.