Light Emitting Device Side Extraction and Inhibition
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Solution Overview
Problem
Current light emitting devices with small-pitch LED technology face challenges in achieving uniform light distribution due to the direct blocking of light from the top of the chip, resulting in luminous dark areas and reduced overall brightness.
Innovation Solution
The proposed light emitting device incorporates a light extraction member to enhance light intensity by extracting light from the side surfaces of the semiconductor light source, while a light inhibiting layer is used to partially inhibit light from the top surface, preventing dark areas and maintaining high overall brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light from the top of the chip is directly blocked to reduce top luminescence, then the top light intensity is reduced, but dark areas appear on the top of the chip
Solution Approach 1:
The light inhibiting layer is designed with non-uniform optical properties - it has different light inhibition characteristics in different regions. The layer allows light to pass through in peripheral areas while blocking light in central areas, creating local quality variations that prevent both excessive top luminescence and dark areas simultaneously
Solution Approach 2:
The light inhibiting layer divides the light transmission path into different zones - a first region that allows light transmission and a second region that blocks light. This segmentation of the inhibition function enables selective control of light distribution, maintaining uniformity while reducing overall top luminescence
2Length of stationary object
If smaller-sized chips are used to reduce light mixing distance, then the device thickness is reduced, but uniform light distribution becomes difficult to achieve
Solution Approach 1:
The light inhibiting layer introduces local quality variations in the optical path, creating different light transmission characteristics in different regions. This compensates for the reduced light mixing distance by providing localized light redistribution, ensuring uniform appearance despite the thinner structure
Solution Approach 2:
Instead of relying solely on the thickness dimension for light mixing, the invention introduces a lateral dimension solution through the patterned light inhibiting layer. The layer creates lateral light redistribution through its selective transmission and blocking regions, compensating for the reduced vertical mixing distance
3Illumination intensity
If the light extraction member extracts light from side surfaces, then overall light intensity increases, but light distribution uniformity may be affected
Solution Approach 1:
The invention merges two light extraction approaches - side surface extraction by the light extraction member and top surface extraction through the light inhibiting layer. This combination ensures that light is extracted from multiple directions and redistributed uniformly, maintaining both high intensity and uniform distribution
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 increases the overall light intensity and prevents dark areas or bright spots in the display device, allowing for a thinner backlight device with high overall brightness, even with a reduced light mixing distance.
Implementation Method 1
a wavelength conversion member stacked on the first light emitting surface... the wavelength conversion member being configured to receive and convert a wavelength of light
Implementation Method 2
a light extraction member surrounding the semiconductor light source and the wavelength conversion member... the light extraction member being configured to extract light from the second light emitting surface
Implementation Method 3
a light inhibiting layer stacked on a top surface of the light transmitting layer away from the wavelength conversion member, and configured to partially inhibit a light emergent brightness of the top surface of the light transmitting layer
Data Source
AI summary
A light-emitting device and a display apparatus. The light-emitting device extracts, by means of a light extraction member, light emitted from a side surface (a second light-emitting surface) of a semiconductor light source; the light from the side surface is collected to a top part to be emitted to a wavelength conversion member together with light from a first light-emitting surface; white light is emitted from a top part (a second abutting surface of the wavelength conversion member; and after passing through a light-transmitting layer, the white light is emitted from a top part of the light-transmitting layer that is in the thickness direction thereof and is provided with a light inhibition layer, and the white light from the top part is partially inhibited by the light inhibition layer.