Sub-Pixel Temperature Compensation During Display Sensing
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Solution Overview
Problem
The electrical characteristics of sub-pixels in a display device can vary due to process deviations and deterioration, leading to inaccuracies in sensing operations, especially when performed over extended periods in a power-off state where temperature changes occur.
Innovation Solution
A display device with a temperature measurement part and sensing part that measures and compensates for sub-pixel temperatures during sensing operations, using temperature maps and compensation values to adjust input image data, even when the operation takes longer than a reference time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the sensing operation is performed for a relatively long time in the power-off state, then the sensing operation can be completed for all sub-pixels, but the temperature of the sub-pixel changes during the operation causing inaccurate sensing results
Solution Approach 1:
The patent measures the temperature of the sub-pixel at multiple time points during the sensing operation (first temperature at first time point, second temperature at second time point) before completing the sensing operation. This preliminary temperature measurement allows the system to compensate for temperature changes that occur during the extended sensing period, thereby maintaining sensing accuracy despite the long operation duration required to sense all sub-pixels.
Solution Approach 2:
The patent changes the temperature parameter measurement approach by taking temperature measurements at different time points during the sensing operation rather than assuming a constant temperature. The system calculates the temperature change and uses this parameter change to compensate for the sensing data, transforming the problem of temperature variation from a source of error into a correctable parameter.
2Use of energy by moving object
If the sensing operation is performed in the power-off state to save energy, then energy consumption is reduced, but the sensing operation takes longer time and temperature changes occur
Solution Approach 1:
The patent performs preliminary temperature measurements at the beginning and during the sensing operation in the power-off state. By measuring temperature at these early stages and using it to compensate for subsequent temperature changes, the system can complete the full sensing operation for all sub-pixels without needing to power on the display, thus saving energy while accounting for the extended time required.
3Measurement precision
If temperature measurement is performed during the sensing operation, then temperature changes can be compensated, but the operation time and complexity increase
Solution Approach 1:
The patent integrates the temperature measurement function with the existing sensing operation infrastructure. The same sensing circuitry and control logic are used to perform both the electrical characteristic sensing and the temperature measurement, rather than requiring separate dedicated temperature measurement hardware and procedures. This multi-functional approach reduces the overall system complexity while enabling temperature compensation.
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
Ensures accurate sensing operations by accounting for temperature changes over time, improving display quality by compensating for sub-pixel variations.
Implementation Method 1
a temperature measurement part configured to measure a temperature of the sub-pixel
Data Source
AI summary
A method of driving a display device includes measuring a temperature of a sub-pixel; sensing the sub-pixel to generate sensing data; compensating for input image data based on the temperature of the sub-pixel and the sensing data to generate a data signal; and generating a data voltage based on the data signal to provide the data voltage to a display panel, wherein a first color sub-pixel is sensed to generate first sensing data, and a temperature of the first color sub-pixel is measured during a first period, wherein a second color sub-pixel is sensed to generate second sensing data, and a temperature of the second color sub-pixel is measured during a second period following the first period, and wherein a third color sub-pixel is sensed to generate third sensing data, and a temperature of the third color sub-pixel is measured during a third period following the second period.