Thermoelectric Display Panel Temperature Control for Luminance Stability
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Solution Overview
Problem
The luminance of light sources in micro organic light emitting diode (μOLED) display panels varies with temperature changes, affecting image quality and user experience in augmented and virtual reality systems, as temperature increases during complex applications and decreases during simpler content or breaks.
Innovation Solution
A temperature control system using a thermoelectric device and controller maintains the display panel temperature within a target range (35° C to 40° C) by heating or cooling, ensuring consistent luminance levels through a PID control loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display panel operates during complex applications, then the luminance output increases, but the temperature increases causing luminance variation and image quality degradation
Solution Approach 1:
The patent implements a feedback control system using a temperature sensor to continuously monitor the display panel temperature and a controller that adjusts the thermoelectric device based on the temperature deviation from a target range (35-40°C). This closed-loop feedback mechanism dynamically compensates for temperature-induced luminance variations, maintaining consistent image quality during complex applications that generate heat.
Solution Approach 2:
The patent changes the operating parameters of the display panel by actively controlling its temperature within an optimal range (35-40°C) using a thermoelectric device. By maintaining the temperature parameter within specified bounds, the system prevents luminance variation and image quality degradation that would otherwise occur during high-performance operation.
2Stability of the object's composition
If active thermal management is implemented, then luminance stability is improved, but device complexity increases due to additional components
Solution Approach 1:
The thermoelectric device serves multiple functions: it can both heat and cool the display panel depending on the operating conditions. This bidirectional capability allows a single component to handle various thermal scenarios (warming up during cold environments, cooling during complex applications), reducing the need for separate heating and cooling systems and thereby limiting the increase in device complexity.
Solution Approach 2:
The temperature control system operates autonomously using a feedback loop where the temperature sensor continuously monitors the display panel temperature and the controller automatically adjusts the thermoelectric device without user intervention. This self-regulating mechanism maintains luminance stability while minimizing the complexity of user interaction and system control.
3Stability of the object's composition
If temperature control is maintained within a narrow range, then luminance consistency is improved, but power consumption increases
Solution Approach 1:
The patent maintains temperature control within a narrow optimal range (35-40°C) only when necessary for luminance consistency, rather than continuously operating the thermoelectric device at full capacity. The feedback control system activates thermal management only when temperature deviations are detected, applying partial action to maintain luminance consistency while avoiding excessive power consumption during normal operating conditions.
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 stabilizes luminance, optimizes light source efficiency, reduces power consumption, and extends the display panel's lifespan by maintaining consistent temperature and luminance levels.
Implementation Method 1
a thermoelectric device coupled to the display panel and configured to transfer heat to or from the display panel
Implementation Method 2
the heat sink including a thermal conductive material and configured to dissipate heat to or absorb heat from ambient air
Data Source
AI summary
A system includes a display panel, a temperature sensor configured to measure a temperature of the display panel, a thermoelectric device coupled to the display panel and configured to transfer heat to or from the display panel, and a controller electrically coupled to the temperature sensor and the thermoelectric device. The controller is configured to receive the measured temperature of the display panel and, based on the measured temperature of the display panel, send a second signal to the thermoelectric device to cause the thermoelectric device to remove a first quantity of heat from the display panel or send a third signal to the thermoelectric device to cause the thermoelectric device to provide a second quantity of heat to the display panel.