Blue-Light Transmission Layer in Display Device
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Solution Overview
Problem
Liquid crystal display (LCD) devices using blue-light transmission layers face degradation and reduced light conversion efficiency due to high-temperature deposition, which affects the color filter and overall light extraction efficiency.
Innovation Solution
A display device design that includes a blue-light transmission layer disposed between the support layer and the planarization layer, rather than on the color filter, utilizing a multi-layer structure of dielectric thin films with alternating refractive indices to enhance light extraction efficiency while preventing color filter degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the blue-light transmission layer is disposed on the color filter, then light extraction efficiency is improved, but the color filter deteriorates due to high-temperature deposition
Solution Approach 1:
The blue-light transmission layer is relocated from the conventional position on the color filter to a new position between the support layer and the planarization layer. This spatial repositioning in the vertical dimension allows the layer to perform its light extraction function while avoiding direct contact with the color filter, thereby preventing thermal degradation during deposition.
2Loss of energy
If the blue-light transmission layer is disposed on the color filter, then light conversion efficiency is improved, but the deposition temperature causes quantum dot degradation
Solution Approach 1:
The support layer and planarization layer serve as intermediary structures that allow the blue-light transmission layer to be deposited at high temperatures without directly exposing the temperature-sensitive color filter and quantum dots to thermal stress. This intermediary positioning protects the fluorescent materials from degradation.
3Reliability
If the blue-light transmission layer is disposed between the support layer and planarization layer, then color filter degradation is prevented, but manufacturing complexity increases
Solution Approach 1:
The support layer and planarization layer serve multiple functions: they provide structural support, enable the deposition of the blue-light transmission layer at optimal temperatures, and protect the color filter from thermal damage. By integrating these functions into existing layers, the patent avoids adding excessive complexity while achieving the desired protection.
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 improves light extraction efficiency and prevents color filter degradation by avoiding high-temperature deposition, simplifying the manufacturing process and maintaining the integrity of the color filter.
Implementation Method 1
the blue-light transmission layer is disposed below the color filter to reflect light upwards
Implementation Method 2
a quantum dot absorbs blue light, converts a blue color of the blue light to a red or green color, and emits the converted light
Implementation Method 3
utilizing a multi-layer structure of dielectric thin films with alternating refractive indices to enhance light extraction efficiency
Data Source
AI summary
A display device includes: a first substrate; a support layer defining a microcavity above the first substrate; a liquid crystal layer disposed in the microcavity; a planarization layer disposed on the support layer; and a blue-light transmission layer disposed between the support layer and the planarization layer. The display device has improved light extraction efficiency and process efficiency.