OLED Heat Spreader Layout for Thin, Lower-Power Displays
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Solution Overview
Problem
In compact electronic devices like smartphones and tablets, existing cooling solutions such as fans and passive heat sinks are bulky, preventing their use in thin designs, and OLEDs' driving voltage increases with temperature, affecting power efficiency.
Innovation Solution
A thin heat spreading device, such as a vapor chamber or heat pipe, is used between the OLED and heat-generating components to dissipate heat efficiently, reducing the OLED's driving voltage and improving power efficiency by utilizing the temperature-dependent properties of OLED materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling solutions (fans and heat sinks) are used, then heat dissipation is achieved, but device thickness increases and portability is reduced
Solution Approach 1:
The patent combines the OLED display with the heat dissipation function by integrating a heat spreader directly behind the OLED structure. This merging of display and thermal management functions eliminates the need for separate cooling components, achieving effective heat dissipation while maintaining thin device profile
Solution Approach 2:
The OLED structure serves dual purposes: as the light-emitting display component and as part of the heat dissipation system. The heat spreader is integrated into the display assembly, making the display module itself a multi-functional component that both displays images and manages thermal heat from the device
2Temperature
If OLED operating temperature increases, then heat dissipation is improved, but driving voltage increases and power efficiency decreases
Solution Approach 1:
The patent implements thermal feedback control where temperature sensors monitor the OLED operating temperature and provide signals to a control system. The controller adjusts driving parameters in real-time based on temperature feedback, reducing driving voltage when temperature rises to maintain optimal power efficiency
Solution Approach 2:
The patent dynamically changes operating parameters (driving voltage and current) based on temperature conditions. When OLED temperature increases, the system automatically reduces driving voltage to compensate for the temperature-induced voltage increase, thereby maintaining consistent power efficiency across different operating temperatures
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
The heat spreading device effectively dissipates heat from electronic components, lowering the OLED's driving voltage and power consumption, enabling thinner, more efficient electronic devices while maintaining high performance.
Implementation Method 1
a heat spreading device between the OLED and the heat generating device, the heat generating device directly contacts the heat spreading device, the heat spreading device is configured to dissipate heat generated by the heat generating device to the OLED
Implementation Method 2
A thin heat spreading device, such as a vapor chamber or heat pipe, is used between the OLED and heat-generating components to dissipate heat efficiently
Implementation Method 3
A thin heat spreading device, such as a vapor chamber or heat pipe, is used between the OLED and heat-generating components to dissipate heat efficiently
Data Source
AI summary
An electronic device may include an organic light emitting display (OLED), a heat generating device, and a heat spreading device. The heat generating device may provide heat directly to the heat spreading device, and the heat spreading device is to dissipate the heat from the heat generating device and evenly heat the OLED and lower a driving voltage of the OLED to reduce power consumption of the OLED.