PHOLED Light Panels for Personal Lighting Glare and Heat Control
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Solution Overview
Problem
Conventional light devices suffer from high peak luminance, excessive heat, and glare issues, making them unsuitable for personal use due to inefficiencies in light distribution and temperature management.
Innovation Solution
The development of a light emitting assembly using phosphorescent organic light emitting devices (PHOLEDs) with a peak luminance less than 5,000 cd/m2, efficiency greater than 30 lm/W, and a maximum surface temperature of no greater than 40°C, integrated with a touch-sensitive surface for control, and a thin, flexible design to minimize glare and heat while maximizing luminaire emission utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light devices are used to provide high illumination, then light output is sufficient, but peak luminance becomes excessively high causing glare and heat issues
Solution Approach 1:
The light emitting assembly is divided into multiple light panels (e.g., four panels) that collectively provide the required illumination. By segmenting the light source into multiple lower-luminance panels rather than a single high-luminance source, the device achieves sufficient total light output while maintaining peak luminance below 5,000 cd/m2 to avoid glare and excessive heat generation.
2Illumination intensity
If light devices operate at high power to emit sufficient light, then illumination is adequate, but temperature rises excessively
Solution Approach 1:
The device operates at optimized power parameters where each light panel is driven to achieve the required luminous flux while maintaining surface temperature at or below 40°C. This involves controlling the electrical parameters (current, voltage) applied to the phosphorescent OLEDs to balance light output with thermal management, ensuring safe operation during illumination.
3Weight of moving object
If the device is designed to be thin and flexible, then portability and comfort are improved, but heat dissipation becomes more challenging
Solution Approach 1:
The light emitting assembly utilizes thin-film phosphorescent OLED technology that inherently generates less heat compared to conventional bulk light sources. The thin-film structure allows for flexible form factors while maintaining effective heat dissipation through the substrate and surrounding structure, enabling portable applications where the device remains cool to the touch despite being thin and flexible.
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 solution provides a high-quality, efficient, and safe personal lighting solution that emits sufficient light without excessive glare or heat, allowing for touch-sensitive control and maintaining a low operational temperature, thus enhancing user safety and experience.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
phosphorescent organic light emitting devices (PHOLEDs) with a peak luminance less than 5,000 cd/m2
Data Source
AI summary
A device includes a light emitting assembly including at least one light panel including one or more phosphorescent organic light emitting devices. The device may, for example, be a personal lighting device. The at least one light panel has a peak luminance less than 5,000 cd/m2, an efficiency of greater than 30 lm/W, and a maximum surface temperature during illumination in ambient conditions of no greater than 40° C., At least a portion of the light emitting assembly is touch sensitive to provide control of the device.