OLED Pixel Temperature Measurement via Data Line Voltage
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Solution Overview
Problem
Organic light emitting displays face image quality and brightness deterioration due to temperature changes, as existing temperature compensation methods indirectly measure pixel temperatures, leading to inaccurate temperature information.
Innovation Solution
An organic light emitting display system that directly measures pixel temperatures by using a temperature information generation unit to calculate voltage differences between specific gate voltages, converting these differences into digital values to generate precise temperature information, and compensating data voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is arranged in a certain area of the organic light emitting display to measure temperature, then temperature compensation can be performed, but the measured temperature information contains errors and does not obtain precise temperature information of each pixel
Solution Approach 1:
The patent replaces the mechanical/physical temperature sensor system with an electrical measurement system. Instead of using a temperature sensor that measures temperature through heat conduction, the invention uses a voltage measurement system that directly measures the voltage of data lines, which has a known relationship with pixel temperature. This substitution eliminates the measurement errors inherent in indirect thermal measurement and provides precise temperature information for each pixel.
Solution Approach 2:
The patent introduces voltage as an intermediary parameter to measure pixel temperature. Rather than directly measuring temperature, the system measures the voltage of data lines, which serves as a mediator that correlates with pixel temperature. This intermediary measurement approach allows for direct and accurate temperature information acquisition without the errors of direct thermal sensing.
2Ease of operation
If indirect temperature measurement through heat conduction is used, then temperature compensation can be implemented, but the measurement is not direct and contains errors
Solution Approach 1:
The patent replaces the heat conduction-based temperature measurement system with an electrical voltage measurement system. By measuring the voltage of data lines instead of relying on thermal conduction from temperature sensors, the system achieves direct temperature measurement for each pixel, eliminating the inaccuracies of indirect thermal measurement while maintaining temperature compensation functionality.
Solution Approach 2:
The patent enables the display system to measure its own temperature through the existing data lines without requiring external temperature sensors. The voltage on the data lines naturally reflects the pixel temperature, and the system uses this self-generated electrical signal for temperature measurement and compensation, eliminating the need for separate measurement hardware and improving accuracy.
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
This approach provides accurate temperature information for each pixel, enhancing image quality and brightness stability by directly measuring pixel temperatures and compensating data voltages based on precise temperature data.
Implementation Method 1
The organic light emitting display may display an image by using an organic light emitting device that generates light by recombining electrons and holes therein
Implementation Method 2
The first driving current and the second driving current may be a driving current corresponding to a sub-threshold region of the driving transistor, the sub-threshold region being a voltage range in which the driving current has an exponential relationship with a temperature of the driving transistor
Data Source
AI summary
An organic light emitting display, including a first data line extending along a first direction, a second data line extending along the first direction and disposed parallel to the first data line, a first scan line extending along a second direction perpendicular to the first direction, a first pixel connected to the first data line and the first scan line, a second pixel connected to the second data line and the first scan line, a first constant current source connected to the first data line, a second constant current source connected to the second data line, and a temperature information generation unit comprising a first input port connected to the first data line and a second input port connected to the second data line.