Display Device PSR2 Power Reduction via Region-Specific Frame Rate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display technologies face challenges in reducing power consumption during Panel Self Refresh 2 (PSR2) operations, particularly due to the need for frame memory access and increased costs, as well as difficulties in lowering frame rates and data transmission efficiency when still and moving image regions coexist in a frame.
Innovation Solution
The solution involves transmitting data update information from the processor to the timing controller earlier than the moving image data, allowing the timing controller to specify the moving image region and perform frame rate reduction or data thinning in still image regions, thereby reducing power consumption without the need for frame memory storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PSR2 mode is used to reduce power consumption by stopping data transmission for still image regions, then power consumption is reduced, but frame memory access is required which increases power consumption and cost
Solution Approach 1:
The processor transmits data update information indicating the position of moving image regions in advance before the actual image data transmission. This allows the timing controller to identify still image regions ahead of time and stop transmitting data for those regions, avoiding frame memory access for still areas while maintaining PSR2 functionality without requiring frame memory storage
Solution Approach 2:
The patent extracts only the necessary data update information (position coordinates of moving regions) from the full image data transmission. By transmitting minimal metadata about where changes occur rather than transmitting all pixel data, the system eliminates the need for frame memory while still enabling selective transmission updates
2Use of energy by moving object
If frame rate is lowered in still image regions to reduce power consumption, then power consumption is reduced, but it is difficult to implement when mixed still and moving regions exist
Solution Approach 1:
The display screen is segmented into multiple regions: still image regions and moving image regions. The timing controller applies different frame rates to different regions based on the data update information received - lowering the frame rate for still regions to reduce power consumption while maintaining normal frame rates for moving regions to ensure image quality
Solution Approach 2:
Different quality parameters (frame rates) are applied to different spatial locations on the display. Still image regions receive reduced frame rates for power savings, while moving image regions maintain higher frame rates for visual quality, creating locally optimized display performance
3Use of energy by moving object
If data transmission is stopped for still image regions, then power consumption is reduced, but data transmission efficiency decreases when moving regions are present
Solution Approach 1:
Instead of transmitting complete image data for all regions, the system transmits only partial information - specifically, data update information indicating where changes occur. This partial transmission approach reduces overall data volume and power consumption while maintaining the ability to update moving regions efficiently
Data Source
AI summary
A display device (2) includes a processor (13) that outputs drawing data and a timing controller (11) that outputs the drawing data input from the processor according to horizontal synchronization and vertical synchronization. When a still image region where drawing data has not been updated compared with a previous frame and a moving image region where drawing data has been updated compared with a previous frame are included in one frame, the processor transmits data update information, which is for specifying the position of the moving image region or a line including the moving image region, to the timing controller temporally earlier than drawing data of the line including the moving image region. The timing controller performs processing for lowering the frame rate of the still image region or processing for thinning out some of image lines of the still image region based on the data update information.