Pixel Circuit Thermoelectric Temperature Compensation
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Solution Overview
Problem
Temperature unevenness in OLED and QLED display panels due to thermal effects affects the operating curves of thin film transistors, leading to display quality issues.
Innovation Solution
Incorporating a thermoelectric conversion layer with thermoelectric elements that generate temperature difference voltage signals and perform temperature compensation by adjusting the temperature of light emitting elements, ensuring consistent temperatures across pixel units through a driving circuit layer with temperature difference reading and compensation sub-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current is driven through OLED or QLED display panels, then light is emitted and display function is achieved, but thermal effect causes temperature unevenness across pixels
Solution Approach 1:
The patent converts the harmful thermal effect into a useful signal by using the temperature difference to generate a voltage signal through the thermoelectric element. This voltage signal is then used to drive the temperature compensation transistor, which adjusts the driving current to compensate for temperature-induced performance degradation, thereby converting the harmful heat into a beneficial compensation mechanism.
Solution Approach 2:
The patent implements a feedback loop where the thermoelectric element continuously monitors the temperature difference between the light emitting element and the substrate, generates a corresponding voltage signal, and feeds this signal back to the temperature compensation transistor. The transistor then adjusts the driving current based on this feedback signal, creating a closed-loop system that dynamically compensates for temperature effects during display operation.
2Device complexity
If temperature compensation is not implemented, then device complexity is low, but display quality deteriorates due to temperature unevenness affecting thin film transistor operating curves
Solution Approach 1:
The patent introduces a thermoelectric element as an intermediary component between the light emitting element and the driving circuit. This element converts temperature differences into voltage signals that can be processed by the temperature compensation transistor, serving as a mediator that bridges the thermal domain and the electrical domain to enable compensation without requiring complex temperature sensing and control circuits.
3Measurement precision
If thermoelectric conversion layer is added for temperature compensation, then temperature measurement and compensation capability is improved, but device complexity increases
Solution Approach 1:
The thermoelectric element serves multiple functions: it acts as a temperature sensor by detecting temperature differences, converts temperature differences into voltage signals for signal generation, and drives the temperature compensation transistor for active compensation. This multi-functionality reduces the need for separate sensing and control components, thereby limiting the increase in device complexity despite adding the thermoelectric conversion layer.
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 solution improves the accuracy of temperature compensation, maintaining consistent pixel temperatures and enhancing display quality by addressing thermal disparities.
Implementation Method 1
the thermoelectric element is configured to generate a temperature difference voltage signal between the first signal terminal and the second signal terminal according to a temperature difference between the first terminal and the second terminal
Implementation Method 2
the first terminal is disposed adjacent to the light emitting element and in thermal contact with the light emitting element
Data Source
AI summary
The present application provides a pixel circuit, a display panel, and a temperature compensation method for a display panel. The display panel includes a plurality of pixel units. At least one of the plurality of pixel units includes: a display layer comprising a light emitting element; and a thermoelectric conversion layer comprising a thermoelectric element having a first terminal and a second terminal, wherein the first terminal is disposed adjacent to the light emitting element and in thermal contact with the light emitting element, and the second terminal is disposed away from the light emitting element. The thermoelectric element has a first signal terminal and a second signal terminal, and is configured to generate a temperature difference voltage signal between the first signal terminal and the second signal terminal according to a temperature difference between the first terminal and the second terminal.