Display Driving Control With Multi-Frequency Stress Compensation
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Solution Overview
Problem
Display devices experience changes in pixel characteristics due to varying operating environments, leading to inefficiencies and increased power consumption.
Innovation Solution
A display device with a first and second display area is driven at different operating frequencies, utilizing a multi-frequency mode that includes full driving frames and masking enable frames, with a compensation unit to adjust image data signals based on stress data accumulation and frame counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels are driven at a high operating frequency to maintain display quality and compensate for characteristic changes, then display reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic frequency adjustment by dividing the display panel into multiple display areas that can operate at different frequencies. The driving controller dynamically assigns higher frequencies to areas requiring better display quality (e.g., active content regions) and lower frequencies to areas with static or less critical content, thereby optimizing the balance between display reliability and power consumption.
Solution Approach 2:
Different display areas are assigned different operating frequencies based on their specific requirements. The patent applies local quality by allowing each display area to have customized drive conditions - high-frequency zones for critical display regions and low-frequency zones for less critical regions - rather than uniformly driving the entire panel at a single frequency.
2Device complexity
If a single operating frequency is used for the entire display panel, then device complexity is reduced, but adaptability to different display requirements deteriorates
Solution Approach 1:
The display panel is segmented into multiple independent display areas, each capable of operating at different frequencies. The patent divides the panel into first, second, and potentially third display areas with distinct frequency requirements, allowing independent optimization of each segment while maintaining overall system manageability through centralized control.
Solution Approach 2:
The driving controller is designed with multi-functionality to handle both single-frequency and multi-frequency operating modes. It can universally drive the entire panel at one frequency when simplicity is needed, or switch to differentiated frequency modes when adaptability is required, making the system versatile across different operating scenarios.
Data Source
AI summary
A driving controller includes a compensation unit that receives an image signal corresponding to a first display area and a second display area, calculates stress data based on the image signal and previous stress data, and outputs an image data signal, which is obtained by compensating for the image signal based on the stress data, a memory that stores the stress data of a previous frame from the compensation unit and provides the previous stress data, and a multi-frequency compensation unit that receives a data enable signal, counts a number of consecutive masking enable frames when the data enable signal indicates a multi-frequency mode, calculates accumulated second stress data based on the number of the consecutive masking enable frames and second stress data, which corresponds to the second display area, from among the stress data from the memory, and stores the accumulated second stress data in the memory.