Display Stack Layout for Thermal-Safe Wavelength Conversion
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Solution Overview
Problem
Current display devices face challenges in improving light conversion efficiency and color matching rate, particularly in achieving excellent emission efficiency and color gamut while protecting the color control member from thermal processes during the formation of the color filter layer.
Innovation Solution
A display device design that includes a first substrate with light emitting elements and a color control member, where the color control member is manufactured on a separate substrate from the color filter layer, allowing for improved light conversion efficiency and color matching rate, and is protected from thermal damage during the color filter layer formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the color control member is manufactured on the same substrate as the color filter layer, then the manufacturing process is simpler, but the color control member is damaged by thermal processes during color filter layer formation
Solution Approach 1:
The patent divides the manufacturing process into two separate substrates: the color control member is formed on a first substrate, while the color filter layer is formed on a second substrate. This segmentation allows each component to be manufactured independently under optimal conditions, preventing thermal damage to the color control member during color filter layer formation.
Solution Approach 2:
The patent introduces a base layer as an intermediary component between the color control member and the color filter layer. This base layer serves as a mediator that enables the two components to function together while protecting the color control member from direct exposure to thermal processes during color filter layer formation.
2Reliability
If the color control member is manufactured on a separate substrate, then the color control member is protected from thermal damage, but the device structure becomes more complex
Solution Approach 1:
By segmenting the manufacturing process across two substrates, the patent protects the color control member from thermal damage. The separate substrate approach isolates the temperature-sensitive color control member from the high-temperature color filter layer formation process.
Solution Approach 2:
The patent merges the separately manufactured color control member and color filter layer onto a single display device structure through the base layer. This combining approach maintains the protective benefits of separate manufacturing while integrating the components into a unified device.
3Device complexity
If the color control member and color filter layer are in direct contact, then the device structure is simpler, but light conversion efficiency and color matching rate are reduced
Solution Approach 1:
The base layer acts as an intermediary between the color control member and the color filter layer, preventing direct contact. This intermediary structure optimizes the optical interaction between the two components, improving light conversion efficiency and color matching rate while maintaining a manageable device structure.
4Ease of manufacture
If the color control member is exposed to thermal processes during color filter layer formation, then the manufacturing process is more integrated, but light conversion efficiency and color matching rate are reduced
Solution Approach 1:
The patent segments the manufacturing process to prevent the color control member from exposure to thermal processes. By forming the color control member on a separate substrate before color filter layer formation, the process maintains integration benefits while protecting light conversion efficiency and color matching rate.
Solution Approach 2:
The color control member is manufactured on the first substrate in advance, before the color filter layer is formed on the second substrate. This preliminary action allows the color control member to be prepared under optimal conditions without subsequent thermal exposure that would degrade its optical performance.
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 enhances light conversion efficiency and color matching rate while ensuring the color control member's integrity by separating its manufacturing process from the color filter layer's thermal processes, resulting in improved display performance.
Implementation Method 1
a first wavelength conversion layer disposed on the second light emitting elements, wherein the first wavelength conversion layer converts light of a first color emitted from the plurality of light emitting elements into light of a second color
Data Source
AI summary
A display device includes: a first substrate including sub-pixels including light emitting areas; first electrodes and second electrodes disposed on the first substrate and spaced apart from each other; light emitting elements disposed on the first substrate and disposed on the first electrodes and the second electrodes in the light emitting areas of the sub-pixels; a color control member disposed on the light emitting elements and including light transmitting layers and wavelength conversion layers; a second substrate facing the first substrate and including light transmitting areas overlapping the sub-pixels; color filter layers disposed on a surface of the second substrate facing the first substrate; and a base layer disposed between the first substrate and the second substrate and disposed between at least the wavelength conversion layers and the color filter layers.