Display Device Light Conversion Layer and Eutectic Bonding
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Solution Overview
Problem
Current display devices face challenges in achieving high resolution and efficient light emission, particularly in converting light colors effectively while maintaining durability and luminance under varying environmental conditions.
Innovation Solution
The display device incorporates a first metal layer, light emitting elements, an insulating layer with holes for light conversion, and a reflective layer, along with a transistor and contact electrode, to convert light colors and improve light transmission, with eutectic bonding of light emitting elements to the metal layer for enhanced stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are used to display images, then luminance and lifetime are improved, but light color conversion efficiency deteriorates
Solution Approach 1:
The light emitting element is divided into two separate elements: a first light emitting element that emits high-energy light (e.g., blue or UV) and a second light emitting element that emits the target color light. This segmentation allows each element to operate at its optimal wavelength, improving overall conversion efficiency while maintaining high luminance output.
Solution Approach 2:
A light conversion layer containing phosphor particles is introduced as an intermediary between the first light emitting element and the second light emitting element. This layer converts the high-energy light from the first element into the target wavelength, enabling efficient energy transfer and color conversion without direct contact between the light emitting elements.
2Manufacturing precision
If resolution is increased, then image quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent transitions from planar light emitting element arrangement to a vertical stacked configuration. Multiple light emitting elements and light conversion layers are stacked in the vertical dimension, allowing high-resolution pixel structures to be achieved without proportionally increasing lateral manufacturing complexity. This 3D stacking approach enables precise light emission control while simplifying the manufacturing process.
3Loss of energy
If light conversion layer is added, then light color conversion is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The substrate is designed with differentiated thermal properties: regions underlying light emitting elements have high thermal conductivity for heat dissipation, while regions underlying light conversion layers have lower thermal conductivity to maintain conversion efficiency. This local quality differentiation allows simultaneous optimization of heat management and light conversion performance.
Solution Approach 2:
The substrate is segmented into functionally distinct regions: first substrate regions with high thermal conductivity positioned beneath light emitting elements for heat dissipation, and second substrate regions with lower thermal conductivity positioned beneath light conversion layers for optimal light conversion. This segmentation enables independent optimization of thermal and optical properties in different locations.
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 light emitting efficiency, improves heat dissipation, and achieves high resolution by effectively converting and transmitting light colors, addressing durability and luminance issues in display devices.
Implementation Method 1
a light conversion layer disposed in at least one of the holes and overlapping the light emitting elements. The light conversion layer may convert the light of the first color emitted from the light emitting elements into light of a second color
Implementation Method 2
a reflective layer disposed on an inner surface of each of the holes and exposing at least a portion of the second end of each of the light emitting elements
Implementation Method 3
The first end of each of the light emitting elements and the first metal layer may be eutectic bonded to each other
Data Source
AI summary
A display device and a method of fabricating the same are disclosed, the display device includes a first metal layer on a substrate; light emitting elements emitting light of a first color, each of the light emitting elements having a first end contacting the first metal layer; an insulating layer disposed on the first metal layer and including holes exposing a second end of each of the light emitting elements facing the first metal layer; and a light conversion layer disposed in at least one of the holes and overlapping the light emitting elements. The light conversion layer converts the light of the first color emitted from the light emitting elements into light of a second color.