Multi-Frequency Scan Driving Circuit for Display Power Reduction
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Solution Overview
Problem
Display devices, particularly organic light-emitting display devices, face challenges in reducing power consumption when displaying multiple images, as they require high driving frequencies for both moving and still images, leading to increased energy usage.
Innovation Solution
The implementation of a display device with a multi-frequency driving mode, where the first display area is driven at a normal frequency and the second display area is driven at a lower frequency, utilizing a scan driving circuit that alternately drives scan lines in different frames to reduce power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device drives both display areas at normal frequency to ensure image quality, then image quality is maintained, but power consumption increases
Solution Approach 1:
The patent applies different driving frequencies to different display areas based on their specific requirements. The first display area displays moving images at normal frequency, while the second display area displays still images at reduced frequency, optimizing power consumption while maintaining image quality where needed
Solution Approach 2:
The patent dynamically adjusts the driving frequency of the second scan driving circuit based on the type of image being displayed. When still images are detected, the frequency is reduced to save power, while moving images continue to be displayed at normal frequency
2Use of energy by moving object
If the display device reduces driving frequency to lower power consumption, then power consumption decreases, but image quality and refresh rate deteriorate
Solution Approach 1:
The patent reduces driving frequency only in the second display area where still images are displayed, while maintaining normal frequency in the first display area for moving images, thus lowering power consumption without compromising overall image quality
Solution Approach 2:
The patent applies frequency reduction partially - only to the second scan driving circuit displaying still images - rather than reducing frequency across the entire display, achieving power savings while maintaining necessary image quality in critical areas
3Reliability
If the scan driving circuit drives all scan lines in every frame, then complete image refresh is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic scanning where the second scan driving circuit alternates between driving first scan lines in odd frames and second scan lines in even frames. This periodic action reduces power consumption while maintaining complete image refresh over time
Solution Approach 2:
The patent segments the scanning operation into two separate scan line groups (first scan lines and second scan lines) that are driven alternately in different frames, reducing the power consumption of the second scan driving circuit while ensuring complete image refresh
Data Source
AI summary
A display device includes a display panel which defines first and second display areas, and includes pixels connected to data lines and scan lines, respectively, a data driving circuit which drives the data lines, a scan driving circuit which drives the scan lines, and a driving controller which receives an image signal and a control signal, control the data and scan driving circuits according to an operation mode, and output clock signals. In a multi-frequency mode, the scan driving circuit includes a first scan driving circuit corresponding to the first display area and a second scan driving circuit corresponding to the second display area. The second scan driving circuit sequentially drives first scan lines among scan lines corresponding to the second display area during a first frame, and sequentially drives second scan lines among scan lines corresponding to the second display area during a second frame.