Timing Controller Reduces Display Power via Pixel Data Comparison
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Solution Overview
Problem
Display devices experience increased power consumption and electromagnetic interference due to unnecessary transmission of identical image data between pixels, leading to inefficiencies in data processing and energy usage.
Innovation Solution
A timing controller is implemented to compare image data of current and preceding pixels, determining whether to transmit new data or reuse previous data, and adjust bias currents or perform charge sharing based on these comparisons, thereby reducing unnecessary data transmission and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is transmitted for every pixel in every line regardless of whether it changes, then complete image data transmission is ensured, but power consumption and electromagnetic interference increase due to redundant transmissions
Solution Approach 1:
The patent extracts only the changed portions of image data (delta data) rather than transmitting complete image data for every pixel. The timing controller compares current line image data with previous line image data and transmits only when changes are detected, eliminating redundant transmissions while ensuring complete transmission of actual changes.
Solution Approach 2:
The patent changes the transmission parameter from always transmitting complete image data to transmitting only when change detection indicates a difference. A comparison result signal is generated based on changing image data, and transmission occurs only when this signal indicates a change, thereby reducing power consumption while maintaining data completeness.
2Reliability
If image data is transmitted for every pixel in every line, then all pixels receive updated data, but electromagnetic interference increases due to frequent data transmissions
Solution Approach 1:
The patent extracts and transmits only the essential information (change detection results and delta data) rather than transmitting complete image data repeatedly. By comparing image data between lines and transmitting only when changes occur, the number of transmission events is reduced, thereby decreasing electromagnetic interference while maintaining pixel data update accuracy.
Solution Approach 2:
The transmission parameter is changed from continuous transmission to event-driven transmission based on change detection. The comparison result signal acts as a trigger parameter that determines whether transmission occurs, reducing the frequency of transmissions and associated electromagnetic interference while ensuring pixels receive accurate updated data when changes occur.
3Measurement precision
If complete image data is transmitted for each pixel, then data accuracy is maintained, but data processing efficiency decreases due to redundant data transmission
Solution Approach 1:
The patent extracts only the necessary data (change indicators and delta values) instead of transmitting complete image data for every pixel. The timing controller identifies and transmits only the minimal required information to maintain data accuracy, significantly improving data processing efficiency by reducing the volume of transmitted and processed data.
Solution Approach 2:
The data transmission parameter is changed from transmitting complete image data to transmitting change detection results and differential data. This parameter change maintains image data accuracy through proper comparison and reconstruction processes while dramatically improving productivity by reducing the amount of data that needs to be processed at each stage.
Data Source
AI summary
The present disclosure relates to a technology for a low power operation of a display device. The present disclosure allows reducing power consumption by supplying image data of a pixel of a preceding line again for a pixel of a current line without transmitting new image data when image data are repeated in units of pixels.