LED Display Reflection Structure for Light Direction Control
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Solution Overview
Problem
Current LED display technologies face challenges in controlling light emission direction and achieving high brightness and illumination efficiency, particularly in large area or double-sided displays, due to limitations in light reflection and heat dissipation.
Innovation Solution
The display apparatus incorporates a light emitting device with a height between 1 μm and 20 μm, paired with a reflection structure that controls light emission direction by reflecting light from the device and emitting it from the substrate, utilizing a metal layer or omnidirectional reflective mirror, and optionally includes a wavelength conversion layer or color filter to enhance brightness and color conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED display structures are used, then light emission is achieved, but light emission direction control is poor and illumination efficiency is limited
Solution Approach 1:
The patent introduces a reflection structure as an intermediary element between the light emitting device and the external environment. This reflection structure includes a first reflection structure and a second reflection structure that work together to control and redirect light emission directions, transforming the uncontrolled light output into directed illumination paths.
Solution Approach 2:
The patent adds a vertical dimension to light control by positioning the reflection structure at a height of 1-20 μm above the substrate. This vertical arrangement creates a three-dimensional light path control system, where light is emitted upward, reflected by the reflection structure, and redirected at controlled angles, adding spatial dimensionality to the illumination control.
2Productivity
If conventional LED structures are used, then light emission is achieved, but illumination efficiency is limited due to heat dissipation issues
Solution Approach 1:
The patent segments the light emission and heat management functions into distinct structural components. The light emitting device is separated from the substrate by a height of 1-20 μm, creating space for heat dissipation. The reflection structure is also segmented into multiple components (first and second reflection structures) that can independently manage light reflection while allowing heat to dissipate through the vertical space.
3Area of stationary object
If light emitting devices are placed close to the substrate, then device density is high, but light emission direction control is difficult
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional vertical arrangement. By positioning the light emitting device at a height of 1-20 μm above the substrate and introducing reflection structures at different vertical positions, the system achieves light direction control in the vertical dimension while maintaining high horizontal device density on the substrate.
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 design allows for precise control of light emission direction, improved brightness, and enhanced illumination efficiency, meeting diverse design requirements and suitable for large area or double-sided displays.
Implementation Method 1
a light emitted by the light emitting device is reflected by the first reflection structure, and then emitted from the first substrate
Data Source
AI summary
A display apparatus includes a first substrate, a light emitting device and a first reflection structure. The light emitting device is disposed on the first substrate, wherein a height of the light emitting device is equal to or greater than 1 μm, and less than or equal to 20 μm. The first reflection structure is disposed corresponding to the light emitting device, wherein a light emitted by the light emitting device is reflected by the first reflection structure, and then emitted from the first substrate.