Curved Flexible Substrate Light Emitting Device for Uniform Illumination
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Solution Overview
Problem
Existing light emitting devices with flexible substrates face challenges in achieving both wide light distribution and reduced size, often resulting in uneven color emission and brightness due to the matrix arrangement of light emitting elements.
Innovation Solution
A light emitting device with a flexible substrate member that is curved in a lateral direction perpendicular to its longitudinal direction, featuring a base member, wiring portions, light emitting elements, and sealing members, where the sealing members are positioned lower than the light emitting elements to maintain the curvature and enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a matrix arrangement of light emitting elements is used to achieve wide light distribution, then light distribution is improved, but device size increases
Solution Approach 1:
The flexible substrate member is curved in a lateral direction perpendicular to the longitudinal direction, causing the light emitting elements arranged in a line to emit light in different directions. This curvature transformation enables wide light distribution without requiring a matrix arrangement, thus reducing device size while maintaining effective illumination coverage.
2Reliability
If wire-bonding is performed perpendicular to the array direction to prevent disconnection during bending, then reliability is improved, but device complexity increases
Solution Approach 1:
The substrate member is pre-curving in a lateral direction perpendicular to the array direction before wire-bonding. This preliminary curvature configuration ensures that during subsequent bending operations, the bonding wires experience reduced stress and are less likely to disconnect, thereby improving reliability while maintaining a relatively simple bonding configuration.
3Illumination intensity
If light emitting elements are arranged in longitudinal and lateral directions, then wide light distribution is achieved, but manufacturing precision requirements increase due to uneven color emission and brightness
Solution Approach 1:
By curving the flexible substrate member in a lateral direction, the patent transforms a linear arrangement of light emitting elements into a spatially distributed configuration. This curvature-based approach achieves wide light distribution using a single-row arrangement, thereby eliminating the need for complex matrix arrangements and reducing manufacturing precision requirements for color emission uniformity.
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 allows for a wider light distribution while reducing the device's size, maintaining uniform color tone and brightness, and preventing detachment of light emitting elements during bending.
Implementation Method 1
each of the light emitting elements are covered with a light-transmissive resin which can exert lens effect
Data Source
AI summary
A light emitting device includes a flexible substrate member having a base member and a plurality of wiring portions disposed on a surface of the base member, a plurality of light emitting elements arranged on the surface of the base member and electrically connected to the plurality of wiring portions, and a plurality of sealing members sealing corresponding parts of the substrate member and the light emitting elements respectively. The substrate is curved so that at least a part of periphery of the sealing member is arranged at a position lower than the position on which the light emitting element is disposed.