Display Device Low-Speed Driving Node Voltage Compensation
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Solution Overview
Problem
Low-speed driving of display devices leads to variations in node voltages during image holding periods, causing image quality deterioration and increased electricity consumption due to luminance shifts and flicker issues.
Innovation Solution
A display device and driving method that sets a reference compensation voltage for each pixel during the image holding period, compensating node voltages based on changes in brightness and luminance features measured by an optical compensation tester, to maintain image data voltage and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-speed driving is implemented to reduce electricity consumption, then energy efficiency is improved, but node voltage stability deteriorates causing image quality deterioration
Solution Approach 1:
The patent applies preliminary action by measuring brightness and luminance features before low-speed driving begins, then using these measurements to calculate compensation voltages in advance. The optical compensation tester captures image data at standard driving speeds, and the controller pre-calculates the compensation voltages needed to maintain image quality during subsequent low-speed driving periods, eliminating voltage instability before it occurs.
Solution Approach 2:
The patent changes voltage parameters dynamically based on measured image characteristics. The controller adjusts compensation voltages for different pixels based on their specific brightness and luminance measurements, creating pixel-specific voltage compensation profiles. This parameter adaptation allows the system to maintain stable node voltages during low-speed driving while consuming less energy.
2Productivity
If image holding period is lengthened for low-speed driving, then refresh frequency is reduced saving energy, but voltage leakage increases causing luminance shifts
Solution Approach 1:
The system performs preliminary measurements of brightness and luminance features before entering the extended image holding period. Based on these pre-measurements, compensation voltages are calculated in advance to counteract the expected voltage leakage during the prolonged holding period, ensuring voltage stability is maintained throughout the extended refresh cycle.
Solution Approach 2:
The patent implements feedback by using the optical compensation tester to measure actual brightness and luminance features, then feeding this information back to the controller which calculates appropriate compensation voltages. This closed-loop feedback system ensures that voltage compensation is precisely tailored to the actual image characteristics and leakage patterns observed during extended holding periods.
3Use of energy by stationary object
If refresh period is extended for low-speed driving, then power consumption is reduced, but node voltage leakage increases causing flicker
Solution Approach 1:
The patent changes voltage parameters dynamically based on measured image characteristics and driving conditions. The controller adjusts compensation voltages for each pixel based on its specific brightness and luminance measurements, creating adaptive voltage profiles that prevent flicker during extended refresh periods while maintaining low power consumption.
Solution Approach 2:
The system calculates compensation voltages in advance based on pre-measured brightness and luminance features before the extended refresh period begins. This preliminary calculation of compensation parameters ensures that flicker-preventing voltages are applied from the start of the low-speed driving mode, eliminating flicker issues before they manifest.
Data Source
AI summary
Disclosed herein are a display device for low-speed driving and a driving method thereof. The display device according to embodiments of the present disclosure may set a reference compensation voltage for compensating a node voltage of each pixel during an image holding period after a refresh period where image data are input at the time of low-speed driving, and may compensate a node voltage of each sub pixel on the basis of a unit of at least one frame during each image holding period between the refresh periods, thereby making it possible to prevent a deterioration of image quality and reduce electricity consumption.