Display System PSR Mode Transition Signal Synchronization
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Solution Overview
Problem
Display devices face power consumption issues due to memory access and interface usage when switching between normal and panel self-refresh modes, often resulting in flicker defects caused by frame rate differences.
Innovation Solution
A display system comprising a graphic processor and a display apparatus that transitions between normal and panel self-refresh modes by synchronizing synchronization signals and gradually adjusting frame rates, allowing for efficient power management and reduced flicker through the use of main and auxiliary channels based on the DisplayPort standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display device switches between normal mode and PSR mode, then power consumption is reduced, but flicker occurs due to frame rate difference
Solution Approach 1:
The patent implements dynamic frame rate adjustment during mode transitions. When switching from PSR mode to normal mode, the frame rate is gradually increased from the PSR frame rate to the normal mode frame rate over multiple frames. This dynamic adjustment eliminates flicker while maintaining power savings, resolving the contradiction between energy efficiency and display stability.
Solution Approach 2:
The patent changes the synchronization signal parameters during mode transitions. Specifically, it adjusts the frame rate parameter dynamically during the transition period, and modifies synchronization signal timing to ensure smooth transitions between modes. This parameter adjustment approach eliminates flicker artifacts while preserving power consumption benefits.
2Reliability
If memory access and interface are used continuously, then image display is maintained, but power consumption increases
Solution Approach 1:
The patent implements panel self-refresh mode where the display panel refreshes itself periodically using stored image data from frame memory, without continuous data input from the host. This periodic self-refresh operation maintains image display continuity while significantly reducing memory access frequency and interface usage, thereby lowering power consumption compared to continuous normal mode operation.
Solution Approach 2:
The display apparatus performs self-refresh operations using its own internal frame memory and control logic, without requiring continuous host processor involvement or external memory access. The panel reads and refreshes its own stored data autonomously, reducing the power consumption associated with continuous memory access and interface operations while maintaining display functionality.
Data Source
AI summary
A display system includes a graphic processor and a display apparatus. The graphic processor supplies a first image signal and a first synchronization signal. The display apparatus is driven in a normal mode in which a first image is displayed, during a first period, based on the first image signal and the first synchronization signal provided from the graphic processor and in a panel self refresh (PSR) mode in which a second image is displayed based on a second image signal stored in a frame buffer of the display apparatus and a second synchronization signal generated in the display apparatus, and transmits the second synchronization signal of the PSR mode to the graphic processor when a driving mode of the display apparatus is changed from the PSR mode to the normal mode. The graphic processor is configured to generate the first synchronization signal synchronized with the second synchronization signal.