Display Panel Frame Memory for Adaptive Still-Image Refresh
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Solution Overview
Problem
Organic light emitting display apparatuses consume significant power due to continuous refresh operations even when displaying still images.
Innovation Solution
A display apparatus with a frame memory and data processing portion that stores and processes image data, allowing transmission of previously processed data when no image change is detected, and implementing a variable refresh rate to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous refresh operation is performed for each frame even when displaying the same still image, then the display apparatus maintains image refresh functionality, but power consumption increases significantly
Solution Approach 1:
The patent implements variable refresh rate operation where the display apparatus performs refresh operations at different intervals based on image content. When consecutive frames are identical (still image detection), the refresh rate is reduced or skipped entirely. This transforms the continuous periodic refresh into an adaptive periodic action that maintains necessary display functionality while eliminating unnecessary power-consuming operations.
Solution Approach 2:
The patent changes the refresh rate parameter dynamically based on image content analysis. By detecting whether consecutive frames are identical or different, the system adjusts the refresh operation frequency - using higher refresh rates for moving images and lower or zero refresh rates for still images. This parameter adaptation resolves the contradiction by matching operational intensity to actual display needs.
2Manufacturing precision
If image quality processing is performed for every frame, then image quality is maintained, but processing time and power consumption increase
Solution Approach 1:
The patent applies image quality processing periodically rather than continuously. By detecting identical consecutive frames, the system skips quality processing for redundant frames and only processes frames that contain actual image changes. This periodic processing approach maintains image quality for displayed content while significantly reducing processing time and associated power consumption.
Solution Approach 2:
The patent performs preliminary frame comparison before initiating image quality processing. By checking whether the current frame differs from the previous frame in advance, the system determines whether quality processing is necessary. This preliminary action prevents unnecessary processing operations, reducing time loss while ensuring quality processing is applied when needed.
3Reliability
If full frame refresh is performed continuously, then display updates are ensured, but unnecessary processing occurs for still images
Solution Approach 1:
The patent implements conditional refresh operations where full frame refresh is performed periodically based on actual image changes. When frame comparison detects identical consecutive frames, the system skips the refresh operation entirely. This periodic refresh strategy ensures display updates occur reliably when content changes while eliminating wasteful processing during still image periods.
Solution Approach 2:
The patent dynamically changes the refresh operation parameter based on image content detection. By monitoring frame differences, the system adjusts whether to perform full refresh, partial refresh, or no refresh at all. This parameter adaptation optimizes processing efficiency by matching refresh intensity to actual display update needs while maintaining reliable display functionality.
Data Source
AI summary
A display apparatus includes a display panel including pixels arranged along a plurality of horizontal lines; a data driving portion converting image data of the pixels into data voltages; a frame memory receiving and storing the image data of a refresh frame; and a data processing portion receiving and image quality-processing the image data stored in the frame memory in a unit of one horizontal line, and transmitting the image quality-processed image data to the data driving portion and the frame memory; wherein the frame memory updates and stores the image quality-processed horizontal line image data into a corresponding horizontal line therein, and wherein image data of a nth refresh frame updated in the frame memory are transmitted to the data driving portion in a unit of one horizontal line when an image of a n+1th refresh frame is identical to an image of the nth refresh frame.