OLED Display Panel Temperature Sensing via Threshold-Voltage Subpixels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in accurately detecting driving temperature variations across different locations on the display panel, which affect the threshold voltage of light emitting diodes, leading to inconsistencies in luminance and image quality.
Innovation Solution
Incorporation of sensing subpixels in non-display areas to detect driving temperatures using threshold voltages, allowing for precise temperature measurement and compensation of data voltages based on these readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional temperature sensors are used to detect driving temperature, then temperature detection capability is provided, but device complexity and power consumption increase
Solution Approach 1:
The sensing subpixels utilize the existing light emitting diode structure and electrical characteristics to perform temperature detection, making the display panel components serve dual purposes: display function and temperature sensing function. This eliminates the need for separate temperature sensors and reduces device complexity.
Solution Approach 2:
The display panel's own light emitting diodes and electrical characteristics are used to detect temperature, allowing the system to self-monitor without external sensing components. The threshold voltage of the light emitting diode naturally varies with temperature, providing a built-in sensing mechanism.
2Measurement precision
If traditional temperature sensors are used to detect driving temperature, then temperature detection capability is provided, but power consumption increases
Solution Approach 1:
The sensing subpixels utilize the existing light emitting diode structure and electrical characteristics to perform temperature detection, making the display panel components serve dual purposes: display function and temperature sensing function. This eliminates the need for separate temperature sensors and reduces device complexity.
Solution Approach 2:
The display panel's own light emitting diodes and electrical characteristics are used to detect temperature, allowing the system to self-monitor without external sensing components. The threshold voltage of the light emitting diode naturally varies with temperature, providing a built-in sensing mechanism.
3Device complexity
If threshold voltage of light emitting diode is used for temperature detection, then temperature detection is enabled using existing structure, but manufacturing precision requirements increase
Solution Approach 1:
Sensing subpixels are strategically positioned in non-display areas where precise manufacturing control is more achievable and where they can serve as reference points for temperature detection across different regions of the display panel.
Solution Approach 2:
The system measures the threshold voltage of sensing subpixels and uses this feedback information to determine temperature, then applies compensation to the data voltages of display subpixels. This closed-loop feedback mechanism compensates for manufacturing variations and maintains display quality.
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
Accurate detection of driving temperatures at each location enables improved luminance control and image quality by supplying compensated data voltages, reducing the need for additional temperature sensors and minimizing power consumption.
Implementation Method 1
A threshold voltage of the light emitting element (or light emitting diode) disposed on the display panel may vary depending on a temperature of the display panel
Data Source
AI summary
A display apparatus includes a display panel including a plurality of unit subpixels disposed at a display area and a plurality of sensing subpixels disposed at a non-display area, a data driving circuit configured to supply data voltages to the display panel, and a timing controller configured to detect temperatures of the display panel by threshold voltages sensed in the plurality of sensing subpixels and transmit image data applied compensation values depending on the temperatures of the display panel.