Multi-Frequency Display Panel Driving with Scan Signal Compensation
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption while maintaining display quality, particularly in managing the operating frequencies of different display areas to optimize energy efficiency.
Innovation Solution
The display device employs a multi-frequency mode where a first display area is driven at a first operating frequency, and a second display area is driven at a second operating frequency lower than the first, with specific scan signal management to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the operating frequency of the second display area is lowered to reduce power consumption, then energy efficiency is improved, but display quality may deteriorate due to visible luminance differences between areas
Solution Approach 1:
The display panel is divided into two distinct display areas (first display area and second display area) that can be operated at different frequencies independently. This segmentation allows the first display area to run at a higher frequency for high-quality display while the second display area runs at a lower frequency to reduce power consumption, without compromising overall display quality through compensating circuitry.
Solution Approach 2:
Different operational characteristics are applied to different parts of the display panel. The first display area maintains high-frequency operation with full scan signals for superior display quality, while the second display area uses low-frequency operation with reduced scan signals for energy efficiency. Compensating circuits are locally applied to pixels in the second display area to maintain acceptable display quality despite the reduced operating frequency.
2Use of energy by moving object
If scan signals are reduced in the second display area to lower power consumption, then energy efficiency is improved, but pixel control precision may worsen
Solution Approach 1:
Compensating circuits are pre-configured in the pixels of the second display area to anticipate and correct for the effects of reduced scan signal frequency. These circuits perform preliminary adjustments to pixel parameters (such as threshold voltage compensation or luminance compensation) before the actual display refresh, ensuring that pixel control precision is maintained despite the lower operating frequency and reduced scan signal activity.
Data Source
AI summary
A display device includes: a display panel including pixels, a data driving circuit, a scan driving circuit which drives a plurality of first scan lines and a plurality of second scan lines, and a driving controller which controls the data driving circuit and the scan driving circuit to drive a first display area of the display panel at a first operating frequency and drive a second display area of the display panel at a second operating frequency lower than the first operating frequency while an operating mode is a multi-frequency mode. During the multi-frequency mode, first scan signals provided to first scan lines, which correspond to the second display area, of the plurality of first scan lines are maintained at inactive levels in predetermined frames, and second scan signals provided to the plurality of second scan lines transition to active levels at least twice in each of the predetermined frames.