Scan Switch for Partial Display Power Reduction
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Solution Overview
Problem
Display devices face challenges in reducing power consumption when operating in partial mode, as existing technologies do not efficiently manage power distribution across different regions of the display panel.
Innovation Solution
The implementation of a display device with a scan switch and data switch that selectively provide scan carry signals or disable signals to scan and data drivers, allowing for power management by controlling the operation of scan and data stages based on driving modes, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display device operates in partial mode to display images only on specific regions, then the power consumption should be reduced, but existing technologies do not efficiently manage power distribution across different regions
Solution Approach 1:
The display panel is divided into multiple regions (first region and second region), and the scan driver is divided into multiple scan stages (first scan stage and second scan stage) that can be independently controlled. This segmentation allows the device to selectively activate only the scan stages and regions needed for current display operations, thereby reducing power consumption while maintaining adaptability through the scan switch that can route signals to different regions based on driving mode.
2Productivity
If scan and data drivers operate continuously to cover the entire display panel, then full display capability is maintained, but power consumption increases when partial region display is needed
Solution Approach 1:
The scan switch is configured to dynamically change its operation mode based on driving mode signals. In first driving mode, the scan switch connects the first scan stage to the second scan stage, enabling full panel scanning. In second driving mode, the scan switch disconnects the second scan stage, enabling partial region scanning. This dynamic reconfiguration allows the system to adapt scan coverage to actual display needs, reducing power consumption when full panel coverage is not required.
3Use of energy by stationary object
If the scan switch selectively provides scan carry signals or disable signals to control scan stages, then power consumption is reduced in partial mode, but device complexity increases
Solution Approach 1:
The scan switch acts as an intermediary component between the first scan stage and the second scan stage. It receives scan carry signals from the first scan stage and selectively transmits them to the second scan stage based on driving mode. This intermediary approach allows for flexible power management by simply controlling the switch state rather than requiring complex control logic in each scan stage, thereby managing device complexity while achieving power reduction.
4Reliability
If data drivers provide data signals to all pixels continuously, then complete image display is ensured, but power consumption increases when only partial regions need display
Solution Approach 1:
The data driver operates periodically rather than continuously, providing data signals only during the scan periods when the scan switch enables corresponding scan stages. When the scan switch disconnects the second scan stage in partial mode, the data driver naturally stops providing signals to the second region during that scan cycle. This periodic operation aligned with the scan stage activation ensures complete image display when needed while avoiding unnecessary power consumption during partial mode operation.
Data Source
AI summary
A display device and an electronic device including the same are disclosed. In one aspect, the display device includes a display panel divided into first and second regions. The display device also includes a scan driver including a plurality of first scan stages configured to sequentially provide a scan signal to the pixels in the first region, a plurality of second stages configured to sequentially provide the scan signal to the pixels in the second region, and a scan switch connected between the first and second stages. One of the first scan stages is configured to provide a scan carry signal to the scan switch, the scan switch is configured to selectively provide the scan carry signal or a scan disable signal to the second scan stages, and the scan carry signal and the scan disable signal are configured to halt the operation of the second scan stages.