Display Device Temperature Profile Estimation Using Turn-Off Data
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Solution Overview
Problem
Display devices experience temperature changes due to heat generation, affecting image characteristics, and existing methods fail to accurately estimate and adjust for these temperature variations.
Innovation Solution
A method and device that calculates a temperature profile by using a turn-off temperature profile, temperature change rate, and elapsed time to estimate a turn-on temperature profile, allowing for accurate temperature estimation and adjustment of settings such as driving voltage and backlight intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the display device operates for extended periods, then heat generation increases causing temperature rise, but this temperature rise affects image characteristics and display quality
Solution Approach 1:
The system performs preliminary actions by storing turn-off temperature profiles and temperature change rates before operation, and uses these pre-stored data to estimate turn-on temperature profiles at the beginning of each operation cycle. This preliminary preparation enables accurate temperature compensation from the start of operation, addressing the temperature rise issue before it significantly degrades image quality.
Solution Approach 2:
The system implements feedback by continuously monitoring temperature changes during operation, storing actual temperature profiles, and using this feedback data to improve future temperature estimations. The controller adjusts driving conditions based on detected temperature variations, creating a closed-loop system that maintains display quality despite heat generation during extended operation.
2Reliability
If temperature compensation is implemented using traditional methods, then some temperature adjustment is achieved, but the temperature estimation accuracy is insufficient leading to inadequate compensation
Solution Approach 1:
The system performs preliminary actions by storing turn-off temperature profiles and temperature change rates before operation, and uses these pre-stored data to estimate turn-on temperature profiles at the beginning of each operation cycle. This preliminary preparation enables accurate temperature compensation from the start of operation, addressing the temperature rise issue before it significantly degrades image quality.
Solution Approach 2:
The system changes parameters by considering multiple factors including turn-off temperature profiles, temperature change rates, elapsed time, and ambient temperature to dynamically calculate turn-on temperature profiles. This multi-parameter approach replaces simple temperature models with comprehensive thermal characterization, significantly improving estimation accuracy and compensation reliability.
3Duration of action of stationary object
If the display device is turned off for extended periods, then temperature returns to ambient level, but upon turn-on the temperature profile is unknown requiring inaccurate assumptions
Solution Approach 1:
The system performs preliminary actions by storing turn-off temperature profiles and temperature change rates before operation, and uses these pre-stored data to estimate turn-on temperature profiles at the beginning of each operation cycle. This preliminary preparation enables accurate temperature compensation from the start of operation, addressing the temperature rise issue before it significantly degrades image quality.
Solution Approach 2:
The system creates copies of temperature characteristics by storing turn-off temperature profiles and temperature change rates in memory. These stored profiles serve as templates that can be referenced and used to estimate turn-on temperature profiles after any duration of turn-off, eliminating the need for assumptions about the unknown temperature state following extended idle periods.
4Reliability
If driving voltage and backlight intensity are adjusted frequently, then temperature control and image consistency improve, but energy consumption and system complexity increase
Solution Approach 1:
The system changes parameters by considering multiple factors including turn-off temperature profiles, temperature change rates, elapsed time, and ambient temperature to dynamically calculate turn-on temperature profiles. This multi-parameter approach replaces simple temperature models with comprehensive thermal characterization, significantly improving estimation accuracy and compensation reliability.
Solution Approach 2:
The system implements feedback by continuously monitoring temperature changes during operation, storing actual temperature profiles, and using this feedback data to improve future temperature estimations. The controller adjusts driving conditions based on detected temperature variations, creating a closed-loop system that maintains display quality despite heat generation during extended operation.
Data Source
AI summary
A display device includes a display panel including a plurality of blocks, a data driver which provides data voltages to the display panel, and a controller which controls the data driver according to a temperature profile, stores a turn-off temperature profile of the display device, estimates a turn-on temperature profile at a turn-on time of the display device based on the turn-off temperature profile, a temperature change rate after a turn-off of the display device, and an elapsed time from a turn-off time of the display device to the turn-on time, and calculates the temperature profile based on the turn-on temperature profile and a temperature increase profile after a turn-on of the display device.