Multi-Layer Light Conversion Pixel Structure for Simpler Displays
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Solution Overview
Problem
Existing display devices face challenges in simplifying the structure and manufacturing process of pixels with light emitting elements, particularly in efficiently converting and emitting light of different colors.
Innovation Solution
The display device incorporates a pixel structure with a light emitting element comprising an emission layer, first and second light conversion layers, and a semiconductor layer, each with specific conductivity type dopants, and a manufacturing method involving epitaxial growth and layer formation to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple layers and precise alignment are used in light emitting elements, then display quality is improved, but structure complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple functional layers (semiconductor layers, emission layers, light conversion layers) into a single integrated light emitting element structure grown on one substrate, eliminating the need for separate assembly and alignment of multiple components, thus reducing structural complexity while maintaining display quality
Solution Approach 2:
The patent performs preliminary formation of all light emitting element layers on a substrate before substrate removal, including forming semiconductor layers with specific conductivity types, emission layers, and light conversion layers in a predetermined stack structure, which simplifies subsequent manufacturing steps and reduces alignment complexity
2Manufacturing precision
If multiple layers and precise alignment are used in light emitting elements, then display quality is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the formation of multiple functional layers into a single epitaxial growth process on one substrate, combining what would otherwise be separate manufacturing steps into one integrated process, thereby simplifying the manufacturing process while achieving high display quality
Solution Approach 2:
The patent performs preliminary formation of the complete light emitting element stack on a substrate before substrate removal, including all semiconductor layers, emission layers, and light conversion layers, which simplifies subsequent manufacturing steps by having all components ready in their final positions
3Ease of manufacture
If substrate removal and etching processes are used, then light emitting element formation is achieved, but manufacturing time and complexity increase
Solution Approach 1:
The patent performs preliminary formation of the complete light emitting element stack on a substrate including all necessary layers, then removes the substrate in a single step, which is more efficient than forming layers sequentially after substrate removal, thereby reducing manufacturing time
Solution Approach 2:
The patent combines substrate removal with the formation of the light emitting element stack in an integrated process flow, where the substrate serves as a temporary support during layer formation and is then removed in one operation, reducing the number of separate manufacturing steps
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 approach simplifies the manufacturing process and enhances efficiency in producing display devices capable of emitting multiple colors by converting light through multiple quantum wells and conductivity type dopants, improving structural simplicity and manufacturing efficiency.
Implementation Method 1
an emission layer that generates light of a first color
Implementation Method 2
a first light conversion layer disposed between the emission layer and the first electrode to convert the light of the first color into light of a second color
Implementation Method 3
a second light conversion layer disposed between the first light conversion layer and the first electrode to convert the light of the first color or the light of the second color into light of a third color
Implementation Method 4
a first semiconductor layer disposed between the emission layer and the second electrode and including a first conductivity type dopant
Data Source
AI summary
The disclosure relates to a display device and a method of manufacturing the same. A display device includes a pixel including a first electrode, a light emitting element disposed on the first electrode, and a second electrode disposed on the light emitting element. The light emitting element includes: an emission layer that generates light of a first color; a first light conversion layer disposed between the emission layer and the first electrode to convert the light of the first color into light of a second color; a second light conversion layer disposed between the first light conversion layer and the first electrode to convert the light of the first color or the light of the second color into light of a third color; and a first semiconductor layer disposed between the emission layer and the second electrode and including a first conductivity type dopant.