Display Panel Line Stress Compensation for Multi-Frequency Driving
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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 driving controller that operates in single-frequency and multi-frequency modes, adjusting driving frequencies for different display regions based on image type, and compensates for pixel stress by calculating and storing stress data to optimize image data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel is driven at a high driving frequency to maintain image quality, then the image quality is preserved, but the power consumption increases
Solution Approach 1:
The display panel is divided into multiple display regions (first display region and second display region) that can be driven at different driving frequencies. This segmentation allows each region to operate at the optimal frequency for its content, reducing overall power consumption while maintaining image quality where needed.
Solution Approach 2:
The system dynamically adjusts the driving frequency of different display regions based on the input signal characteristics and operational requirements. The driving controller can switch between different driving frequencies (e.g., first driving frequency and second driving frequency) for different regions, enabling adaptive power management that maintains image quality while reducing power consumption.
2Use of energy by moving object
If the driving frequency is reduced to lower power consumption, then the power consumption decreases, but the pixel characteristics change due to stress accumulation
Solution Approach 1:
The system performs preliminary calculations of stress times and operating times for each horizontal line before actual driving occurs. These pre-calculated values are stored and used during the driving process to determine appropriate compensation parameters, allowing the system to anticipate and compensate for pixel characteristic changes rather than reacting to them after they occur.
Solution Approach 2:
The driving controller calculates stress times based on the driving frequency and pattern, then uses these stress time values to determine compensation parameters for the image signal. This feedback mechanism ensures that pixel characteristic changes due to stress accumulation are compensated for, maintaining reliable pixel performance even when driving frequency is reduced for power savings.
3Use of energy by moving object
If different driving frequencies are applied to different regions to reduce power consumption, then the power consumption decreases, but the complexity of the driving controller increases
Solution Approach 1:
The display panel is segmented into multiple regions with different driving frequency requirements. The driving controller is correspondingly segmented into functional units that handle each region independently, including separate stress time calculating units for different horizontal lines. This segmentation manages complexity by dividing the control function into manageable, specialized modules rather than requiring a monolithic complex controller.
Solution Approach 2:
The stress time calculating unit automatically calculates stress times based on the driving frequency and pattern without requiring external intervention. The system self-adjusts by using these calculated stress times to determine compensation parameters, reducing the need for complex external control mechanisms and simplifying the overall system architecture.
Data Source
AI summary
A display device includes: a display panel, and a driving controller to receive an image signal and a control signal, drive the first display region of the display panel at a first driving frequency, and drive the second display region at a second driving frequency. The driving controller counts a first stress time of each of the first horizontal lines, and calculates a first operating time of each of the first horizontal lines based on the first stress time and the first driving frequency, counts a second stress time of each of the second horizontal lines and calculates a second operating time of each of the second horizontal lines based on the second stress time and the second driving frequency, and outputs an image data signal obtained by compensating for stress for the image signal based on the image signal, the first operating time, and the second operating time.