Phase Change Material Thermal Management for LED Displays
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Solution Overview
Problem
Artificial reality systems, such as head-mounted displays, face challenges in maintaining optimal operating temperatures for light emitters, which can lead to performance issues like wavelength shifts and reduced energy efficiency.
Innovation Solution
Incorporating phase change materials (PCMs) into the display system as passive cooling solutions to regulate temperature. PCMs undergo phase transitions in response to heat, absorbing or releasing energy to maintain a consistent operating temperature for light emitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive cooling solutions (heat sinks) are used to dissipate heat, then heat dissipation capability is improved, but device size increases and comfort deteriorates
Solution Approach 1:
The patent applies phase change materials (PCMs) that undergo phase transitions (solid-liquid) at specific temperatures to absorb and store heat energy. The PCM layer is positioned between the light emitter and the user's skin, utilizing the latent heat of fusion to maintain a stable temperature interface, thereby providing effective thermal management without requiring bulky heat sinks or active cooling components.
2Stability of the object's composition
If phase change materials are used for thermal management, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent incorporates a phase change material layer that undergoes solid-liquid phase transitions at a predetermined temperature range. This PCM layer is integrated into the display assembly between the light emitter and the user interface, providing passive thermal regulation through the phase transition process, thereby maintaining temperature stability without complex active control systems.
Solution Approach 2:
The phase change material provides self-regulating thermal management by automatically absorbing excess heat when temperature rises above the phase transition point and releasing heat when temperature drops below it. This passive, autonomous thermal regulation eliminates the need for external control mechanisms, sensors, or power consumption, simplifying the overall device architecture.
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 effectively reduces wavelength shifts and maintains energy conversion efficiency, providing a better viewing experience by minimizing image distortion and ensuring consistent light emission over extended periods.
Implementation Method 1
Each TRE includes a phase change material configured to undergo a phase transition from a first state of matter to a second state of matter in response to heat
Implementation Method 2
PCMs undergo phase transitions in response to heat, absorbing or releasing energy to maintain a consistent operating temperature for light emitters
Data Source
AI summary
Thermal management in a display system can be implemented using at least one temperature regulating element (TRE). The display system can include an array of light emitting diodes or some other type of light emitter. Each light emitter of the array includes an active region configured to emit light and can be formed from a shared semiconductor structure in which the at least one TRE is located. Each TRE includes a phase change material configured to undergo a phase transition from a first state of matter to a second state of matter in response to heat, such that at least some of the heat is expended in causing the phase transition instead of heating an area around the TRE. In this manner, the at least one TRE can operate as a passive cooling solution for regulating the temperatures of the light emitters.