Display Panel Area Segmentation for Power Optimization
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Solution Overview
Problem
Display devices face challenges in reducing power consumption while maintaining image quality, especially when displaying static images at low frequencies, as existing methods can lead to image deterioration and increased power usage.
Innovation Solution
A display device with a controller that rearranges image data for different areas based on their usage (moving or static) and adjusts scan and data signal frequencies, applying specific gamma sets to optimize power usage and image quality by dividing the screen into areas driven at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device drives at a low frequency to reduce power consumption, then power consumption is reduced, but image quality deteriorates
Solution Approach 1:
The display panel is divided into a first area for moving images and a second area for static images. The controller generates first image data by rearranging image data corresponding to the first area in a first arrangement type, and generates second image data by rearranging image data corresponding to the second area in a second arrangement type. This segmentation allows different processing and driving strategies for different content types, enabling power reduction in static areas while maintaining quality in moving image areas.
Solution Approach 2:
The scan driver dynamically adjusts its operation based on the frame period. During a first period of a first frame, it sequentially supplies scan signals for writing data to all pixel rows of the first area. During a second period of the first frame, it sequentially supplies scan signals for writing data to a part of pixel rows of the second area exclusively. This dynamic adjustment optimizes power consumption while maintaining image quality.
2Reliability
If scan signals are supplied to all pixel rows continuously, then image quality is maintained, but power consumption increases
Solution Approach 1:
The scan driver supplies scan signals to only a part of pixel rows of the second area during the second period of the first frame, rather than all pixel rows. This partial action is sufficient for static image display and significantly reduces power consumption compared to continuous full-screen scanning.
Solution Approach 2:
The display device operates with periodic frame structures, where the scan driver supplies scan signals during specific periods (first period for first area, second period for second area) and can stop supplying scan signals during a third period of the first frame. This periodic action pattern reduces power consumption while maintaining image refresh quality.
3Device complexity
If the display device uses a single driving frequency for the entire screen, then control is simplified, but power efficiency decreases
Solution Approach 1:
The display panel is segmented into a first area for moving images and a second area for static images, allowing different driving frequencies and scan patterns for each area. This enables optimized power efficiency by driving static areas at lower frequencies while maintaining higher frequencies for moving image areas.
Solution Approach 2:
The controller and scan driver dynamically adjust the driving frequency and scan signal supply based on the content type (moving or static image) in different areas. This dynamic control optimizes power efficiency while managing complexity through automated detection and adaptation.
Data Source
AI summary
A display panel includes a display panel displaying an image including a moving image and a static image; a controller generating first image data to the first area in a first arrangement type, and generating second image data to the second area in a second arrangement type; a scan driver sequentially supplying scan signals to all of pixel rows of the first area during a first period of a first frame and sequentially supplying scan signals to a part of pixel rows of the second area exclusively during a second period of the first frame; and a data driver supplying data signals corresponding to the first image data to data lines during the first period, and supplying data signals corresponding to the second image data to the data lines during the second period.