Display Panel Same-Frame Detection for Lower Data Driver Power
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Solution Overview
Problem
Existing display devices face challenges in reducing power consumption when displaying identical image data frames, leading to unnecessary energy consumption and inefficiency.
Innovation Solution
A display device with a controller that detects identical data regions and prevents the transfer of image data to the data driver, disabling components like the receiving and analog blocks during these periods, and applying a shut down mode data voltage to data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the controller transfers image data to the data driver in every frame period, then the display device ensures continuous data supply to pixels, but power consumption increases unnecessarily when image data remains identical across frames
Solution Approach 1:
The system dynamically adjusts its operation mode between normal data transfer and same-data detection modes. The controller compares current frame image data with previous frame data, and only transfers data when changes are detected. This dynamic adaptation allows the system to maintain reliability when needed while reducing power consumption during static displays.
Solution Approach 2:
Instead of transferring identical image data repeatedly, the system uses the previously transferred data as a reference copy. When the same data is detected in the current frame, the system reuses the existing data in the data driver rather than creating and transferring a new copy, thereby eliminating redundant operations and reducing power consumption.
2Use of energy by stationary object
If the data driver operates continuously to provide data voltages to pixels, then the display device maintains consistent image output, but energy consumption increases during periods when image data does not change
Solution Approach 1:
The data driver operates periodically based on detected changes in image data rather than continuously. When identical data is detected in consecutive frames, the system enters a low-power state where the data driver stops generating new data voltages. The pixels maintain their illumination using the previously stored data voltages, and the system only resumes active operation when data changes are detected.
Solution Approach 2:
The useful action of displaying image data continues without interruption even when the data driver is in low-power mode. The pixels retain the previously received data voltages in their storage capacitors, ensuring continuous illumination and image display. This allows the system to maintain useful output while eliminating redundant data generation and transfer operations.
3Use of energy by stationary object
If the controller transfers image data for the entire display panel in every frame period, then the display device ensures complete data coverage, but power consumption increases when only portions of the panel need updating
Solution Approach 1:
The display panel is segmented into regions based on data change detection. Instead of treating the entire panel as a single unit requiring full data transfer, the system identifies and processes only the segments (pixels or regions) where data changes have occurred. This segmentation allows selective data transfer to specific regions, reducing overall power consumption while maintaining productivity for updated areas.
Solution Approach 2:
Different regions of the display panel are treated with different data transfer qualities based on their update requirements. Regions with unchanged data receive no new data transfer (lowest quality/none), while regions with changed data receive full data transfer (highest quality). This local differentiation optimizes both power consumption and data transfer efficiency by matching the data transfer intensity to the actual update needs of each region.
Data Source
AI summary
A display device including: a display panel including a plurality of pixels; a data driver configured to provide data voltages to the plurality of pixels; and a controller configured to control the data driver, to detect a same data region of the display panel when first image data in a current frame period is the same as second image data in a previous frame period, and not to transfer the first image data to the data driver in the current frame period.