OLED Lighting Device with Thermochromic Pattern
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Solution Overview
Problem
Current OLED lighting devices face limitations in expressing various colors and forms due to their surface light emission nature, which restricts their ability to implement complex designs and functions without compromising light extraction efficiency.
Innovation Solution
Incorporating a thermochromic pattern that changes color with temperature changes, either inside or outside the substrate, allowing for the expression of characters and drawings with various colors without the need for designing processing patterns inside the substrate, thereby enhancing color rendering and light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a processing pattern is designed inside the substrate to express characters and drawings, then color rendering is improved, but light extraction efficiency deteriorates
Solution Approach 1:
The patent moves the pattern design from the internal substrate structure to the external surface of the substrate. By forming the thermochromic pattern on the outer surface rather than inside the substrate, light can pass through the substrate without obstruction while the surface pattern provides color rendering when viewed from the front, thus resolving the contradiction between color rendering and light extraction efficiency.
Solution Approach 2:
The patent employs thermochromic materials that change color in response to temperature variations. This allows the pattern to express various colors dynamically without requiring complex internal processing patterns, achieving color rendering through material property changes rather than structural modifications that would block light.
2Manufacturing precision
If the OLED lighting device uses inorganic light emitting materials, then manufacturing precision is improved, but color rendering property deteriorates
Solution Approach 1:
The patent combines inorganic substrate materials (providing manufacturing precision and structural stability) with organic OLED light emitting materials (providing superior color rendering properties). This composite structure allows the device to benefit from both the manufacturing advantages of inorganic materials and the optical advantages of organic materials.
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 thermochromic pattern enables the OLED lighting device to emit light with uniform luminance and improved color rendering, achieving a bezel-less effect by ensuring the non-active areas appear to emit the same color as the active areas, thus enhancing the device's ability to display complex designs and functions.
Implementation Method 1
a thermochromic pattern arranged inside or outside of a substrate, the thermochromic having a property of changing a color thereof according to a change in temperature
Implementation Method 2
light emitted from an organic light emitting layer when the OLED lighting device is driven
Data Source
AI summary
Disclosed herein is an organic light emitting diode (OLED) lighting device capable of expressing characters or drawings with various colors. The OLED lighting device according to aspects of the present disclosure includes a thermochromic pattern arranged inside or outside of a substrate, the thermo chromic pattern having a property of changing a color thereof according to a change in temperature. By applying a reversible thermochromic pattern, which may maintain or lose an original color thereof according to a temperature change, to the inside or outside of the substrate, it is possible to express characters and drawings with various colors without designing a processing pattern inside the substrate.