Display Panel Temperature Estimation Using Thermal Resistance Models
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Solution Overview
Problem
Display devices experience pixel degradation over time, leading to after-images due to temperature-related heat diffusion, necessitating an accurate method to measure and estimate temperature for effective compensation.
Innovation Solution
A display device with a temperature estimator that calculates block temperatures using stress values from input image data, a resistance model, and heat dissipation, and compensates image data based on these temperatures to mitigate after-images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display device operates for extended periods, then the display function is maintained, but pixel degradation occurs and after-images appear due to heat accumulation
Solution Approach 1:
The patent applies preliminary action by estimating the temperature of each pixel block before driving the display device and compensating the image data in advance. The temperature estimator calculates block temperatures based on accumulated stress values from previous operations, and the after-image compensator pre-adjusts the image data to prevent after-image occurrence, rather than waiting for actual temperature measurement after degradation occurs.
Solution Approach 2:
The patent implements feedback by using the estimated block temperature information to adjust the driving scheme. The temperature estimator continuously monitors temperature based on image data and thermal models, and this temperature feedback is used by the after-image compensator to dynamically adjust image data compensation, creating a closed-loop system that adapts to thermal conditions.
2Measurement precision
If temperature measurement is performed using a temperature sensor, then temperature data is obtained, but the measurement is indirect and may not accurately reflect actual pixel block temperatures due to heat diffusion
Solution Approach 1:
The patent applies copying by creating a thermal model that replicates the heat diffusion characteristics of the display panel. Instead of directly measuring temperatures at multiple pixel locations, the system uses a single temperature sensor reading and copies this information through a thermal model to estimate temperatures of all pixel blocks, avoiding the complexity of multiple sensors while maintaining accuracy.
Solution Approach 2:
The patent uses an thermal model as an intermediary between the temperature sensor and the pixel blocks. The model acts as a mediator that translates the single-point temperature measurement into distributed temperature estimates across the display panel, accounting for heat diffusion patterns without requiring direct measurement at each location.
3Reliability
If image data is compensated based on temperature estimation, then after-image occurrence is reduced, but additional processing complexity is introduced
Solution Approach 1:
The patent applies parameter changes by adjusting image data parameters (luminance, grayscale values) based on estimated temperature conditions. The after-image compensator modifies image data parameters dynamically according to the block temperature estimates, changing the display parameters to compensate for thermal effects and prevent after-images.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately estimates display panel temperatures, reducing after-image occurrence by compensating image data based on block temperatures, thereby improving display performance and longevity.
Implementation Method 1
a temperature sensor sensing a region temperature of the panel region
Implementation Method 2
a resistance model related to a heat diffusion within the display panel
Data Source
AI summary
A display device includes a display panel including a panel region. The panel region includes a block, and the block includes a pixel. The display device further includes a temperature sensor sensing a region temperature of the panel region and a temperature estimator estimating a temperature of the display panel. The temperature estimator includes a stress calculator calculating an accumulated stress value corresponding to the block based on input image data, a temperature potential calculator calculating a temperature potential corresponding to the block based on the accumulated stress value and a resistance model related to a heat diffusion within the display panel, and a temperature calculator calculating a block temperature based on the region temperature and the temperature potential. The temperature of the display panel is estimated based on the block temperature.