Recessed Fluorescent Light Guide for Thin Uniform Surface Emission
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Solution Overview
Problem
Existing surface-emitting light sources in liquid crystal displays face challenges in reducing thickness and minimizing uneven color and brightness, particularly in direct-type liquid crystal displays where the backlight is disposed at the back surface, due to the complexity of integrating light-emitting elements and wavelength conversion layers.
Innovation Solution
A light-emitting device comprising a light guide plate with a recessed fluorescent layer and a light-emitting element, where the fluorescent layer is positioned on the side opposite to the light-emitting surface, and interconnects are used to connect the elements, allowing for efficient light distribution and reduced thickness, while minimizing brightness variations and enhancing color uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light-emitting element and wavelength conversion layer are integrated in a conventional manner, then the light source can be formed, but the thickness cannot be reduced and uneven color and brightness occur
Solution Approach 1:
The patent transitions from a planar integration approach to a three-dimensional configuration by positioning the light-emitting element at a recessed portion of the wavelength conversion layer. This vertical arrangement allows the light-emitting element to be embedded within the wavelength conversion layer, reducing the overall thickness while maintaining effective light interaction and color uniformity through the layered structure.
Solution Approach 2:
The light-emitting element is nested within the wavelength conversion layer by positioning it at a recessed portion. This nesting approach allows the light-emitting element to be partially embedded in the wavelength conversion layer, achieving compact integration that reduces thickness while ensuring uniform light distribution and color consistency across the light source.
2Length of stationary object
If the light-emitting element is positioned closer to the light-emitting surface, then thickness is reduced, but uneven brightness and color occur
Solution Approach 1:
The patent applies local quality by creating a recessed portion specifically at the position where the light-emitting element is to be mounted. This localized structural modification allows the light-emitting element to be positioned optimally within the wavelength conversion layer, ensuring uniform light distribution and color consistency while reducing overall thickness. The recessed portion acts as a specialized zone that maintains brightness uniformity despite the reduced thickness.
3Device complexity
If conventional wiring substrates are used to connect light-emitting elements, then electrical connection is achieved, but device complexity and thickness increase
Solution Approach 1:
The patent merges the wiring substrate function with the wavelength conversion layer by forming conductive patterns directly on the wavelength conversion layer. This integration eliminates the need for separate wiring substrates, reducing structural complexity and thickness while maintaining reliable electrical connections between light-emitting elements. The conductive patterns are formed as part of the wavelength conversion layer structure, achieving both functions in a single component.
Solution Approach 2:
The wavelength conversion layer is given multiple functions: it serves as both the wavelength conversion medium and the wiring substrate. By forming conductive patterns on the wavelength conversion layer, the patent creates a multi-functional component that performs both optical conversion and electrical connection tasks, thereby reducing overall device complexity and eliminating the need for separate wiring substrates.
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 solution enables a thinner and more uniform light-emitting surface, reducing the risk of uneven color in liquid crystal displays by diffusing converted light and eliminating the need for a wiring substrate, thereby improving display performance.
Implementation Method 1
a fluorescent layer (20), a light-emitting element (30)... The fluorescent layer is provided in the recess. The light-emitting element is bonded to the fluorescent layer
Implementation Method 2
a light guide plate (10)... The light guide plate has a first major surface (11), a second major surface (12)... The first major surface functions as a light-emitting surface
Data Source
AI summary
According to one embodiment, the light guide plate has a first major surface, a second major surface, a side surface, and a recess. The recess is provided in the second major surface. The fluorescent layer is provided in the recess. The light-emitting element is bonded to the fluorescent layer and includes an electrode on a surface of the light-emitting element on a side opposite to a surface of the light-emitting element bonded to the fluorescent layer. The module side surface includes at least a portion of the side surface of the light guide plate. The first interconnect is provided along the second major surface and connected to the electrode of the light-emitting element. The second interconnect is provided on the module side surface and connected to the first interconnect.