Layered Flexible Substrates for Thin Light Emitting Devices
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Solution Overview
Problem
Conventional light emitting devices face challenges in configuring circuit boards flexibly due to the need for spaced or adjacent arrangements, which limits their construction and increases thickness, making it difficult to achieve a simplified and flexible configuration.
Innovation Solution
The light emitting device employs a reflective sheet with layered flexible substrates arranged in a lattice pattern, intersecting each other in the thickness direction, allowing for increased flexibility and reduced thickness, while using a reflective sheet with high light reflectance and adhesive members for efficient light extraction and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional circuit boards are arranged spaced apart or adjacent to each other, then the light emitting device can be constructed, but the device complexity increases and thickness increases
Solution Approach 1:
Multiple circuit boards are merged into a single flexible substrate, integrating multiple circuit boards' functions into one component. This reduces the number of separate parts and simplifies the overall configuration, directly addressing the device complexity issue while enabling thinner construction.
Solution Approach 2:
The circuit boards are arranged in the thickness direction (stacked configuration) rather than being spaced apart in the plane direction. This dimensional change allows for reduced device thickness while maintaining all necessary circuit board functions, resolving the contradiction between configuration complexity and thickness.
2Adaptability or versatility
If circuit boards are arranged in conventional spaced or adjacent configurations, then the device can function, but flexibility of configuration is limited
Solution Approach 1:
Multiple circuit boards are integrated into one flexible substrate, providing configuration flexibility while reducing construction complexity. The flexible substrate can be easily shaped and positioned, offering adaptability without requiring complex assembly of multiple separate circuit boards.
Solution Approach 2:
A flexible substrate is used instead of rigid circuit boards, enabling easy configuration and arrangement flexibility. The flexible nature of the substrate allows it to be adapted to different shapes and positions, providing versatility while simplifying the construction process.
3Illumination intensity
If multiple circuit boards are used to achieve light extraction, then light extraction efficiency can be improved, but the overall thickness increases
Solution Approach 1:
Multiple circuit boards' light extraction functions are merged into a single flexible substrate with multiple light emitting sections. This maintains the light extraction efficiency that would require multiple separate boards while eliminating the thickness increase that would result from stacking multiple rigid circuit boards.
Solution Approach 2:
The light emitting sections are arranged in the thickness direction on the flexible substrate, allowing multiple light extraction elements to be compactly positioned without increasing device thickness. This vertical arrangement enables improved light extraction efficiency while maintaining a thin profile.
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 configuration enhances the flexibility of circuit board arrangement, reduces the overall thickness, improves light extraction efficiency, and allows for a wide light distribution angle, making it suitable for applications like backlights and lighting devices, while also simplifying the construction and reducing material costs.
Implementation Method 1
a reflective sheet having a light reflecting face
Data Source
AI summary
A light emitting device includes a reflective sheet having a light reflecting face; a plurality of oblong flexible substrates; and a plurality of light emitting sections disposed at intervals on a face of each of the flexible substrates. The plurality of the flexible substrates comprises a first group of flexible substrates that are lined up at intervals in a first direction and a second group of flexible substrates that are lined up at intervals in a second direction such that the flexible substrates of the second group intersect the flexible substrates of the first group. The first group and the second group are layered in a thickness direction and adhered to at least one face of the reflective sheet so as to expose the plurality of light emitting sections.