Zone-Based Display Data Transmission for Partial Refresh
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Solution Overview
Problem
Current display data transmission methods result in high power consumption due to the need to refresh the entire display panel, even when only partial updates are required, leading to inefficient energy usage.
Innovation Solution
A data transmission method that allows for partial refresh of display data by selectively transmitting image data only to the zones that need updating, using synchronization signals to determine frame periods and controlling the display driver circuit to refresh only the relevant areas, while entering power-saving states for non-refreshed zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire display panel is refreshed using traditional MIPI video mode or command mode, then complete image data is transmitted and displayed, but power consumption increases due to unnecessary transmission and refresh of unchanged areas
Solution Approach 1:
The display panel is divided into multiple zones, and the system selectively refreshes only those zones that contain changed image data. The display driver circuit receives zone identification information indicating which zones require refresh, and accordingly activates only the corresponding data transmission channels and pixel circuits for those specific zones, leaving other zones in a low-power state.
Solution Approach 2:
Instead of refreshing the entire display panel, the system performs partial refresh by transmitting and displaying image data only for the necessary zones. The host device transmits compressed image data representing only the changed zones, and the display driver circuit reconstructs and displays these zones while maintaining other zones in their previous state, thereby reducing overall power consumption.
2Productivity
If all image data is transmitted through MIPI interface for each frame refresh, then the display updates completely, but data transmission bandwidth and energy are wasted on unchanged areas
Solution Approach 1:
The system extracts only the changed zones from the complete image frame and transmits these extracted portions through the MIPI interface. The host device identifies which zones contain changes and transmits only the corresponding image data for those zones, eliminating the need to transmit data for unchanged areas, thus reducing transmission energy consumption.
Solution Approach 2:
The system changes the transmission parameter from full-frame data transmission to selective zone-based data transmission. By modifying the data transmission mode to include zone identification information and compressed image data for only the necessary zones, the system optimizes the use of transmission bandwidth and reduces energy consumption.
3Reliability
If the display driver circuit continuously refreshes all pixel circuits, then the display maintains complete update capability, but power consumption increases due to unnecessary pixel switching and data latching in unchanged zones
Solution Approach 1:
The display driver circuit is segmented into multiple independent data output channels corresponding to different display zones. Each channel can be independently controlled to output data for its corresponding zone. When only specific zones require refresh, only the corresponding channels are activated, reducing the power consumption of the display driver circuit while maintaining the ability to refresh any required zones.
Solution Approach 2:
The system implements periodic refresh only for the zones that contain changed data, rather than continuously refreshing all zones. The display driver circuit receives zone identification information and schedules data output and pixel circuit activation only for the necessary zones during each frame period, reducing unnecessary periodic operations and associated power consumption.
Data Source
AI summary
A data transmission method for a display driver circuit includes steps of: receiving at least one first synchronization signal to determine a frame period for a plurality of image data in an image frame; when a first image data to be refreshed among the plurality of image data, receiving the first image data in a first transmission period corresponding to the first image data; and when a second image data not refreshed among the plurality of image data, stopping receiving the second image data in a second transmission period corresponding to the second image data.