Reflection Control Layer With UV Absorber for Display Cost Reduction
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Solution Overview
Problem
Existing display devices require a polarizing plate to reduce external light reflection, increasing fabrication costs. There is a need to simplify the process and reduce costs while maintaining effective reflection control.
Innovation Solution
A display device with a reflection control layer that includes a UV absorber with a hydrophobic group, allowing the UV absorber to be positioned at the upper portion of the layer without additional masking processes, thereby simplifying the fabrication process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizing plate is used to reduce external light reflection, then reflection control is improved, but fabrication cost increases
Solution Approach 1:
The patent extracts and eliminates the polarizing plate from the display device structure, replacing it with a reflection control layer that has specific optical properties. This removes the need for the expensive polarizing plate while maintaining reflection control functionality through the use of a reflective layer with controlled reflectance characteristics.
Solution Approach 2:
The reflection control layer serves multiple functions: it controls external light reflection, blocks UV radiation, and maintains display visibility. By combining these functions into a single layer rather than using separate polarizing plate and UV filter components, the patent reduces fabrication cost while maintaining comprehensive protection.
2Reliability
If the UV absorber is positioned at the upper portion of the reflection control layer, then UV protection efficiency is improved, but additional masking process is required
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of the UV absorber within the reflection control layer. The UV absorber concentration varies through the thickness of the layer, with higher concentration at the upper portion where UV radiation first enters, optimizing UV protection efficiency while using a single coating process.
Solution Approach 2:
The patent changes the concentration parameter of the UV absorber throughout the reflection control layer thickness. By controlling the absorption coefficient and concentration gradient of the UV absorber material, the patent achieves enhanced UV protection at the upper portion without requiring additional masking steps or multi-layer structures.
3Reliability
If the reflection control layer is exposed to sunlight, then reflection control function is maintained, but color and transmittance are altered
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a UV absorber into the reflection control layer before the device is exposed to sunlight. This UV absorber acts as a protective agent that absorbs harmful UV radiation before it can degrade the organic light-emitting layer, thereby preventing color and transmittance alterations while maintaining reflection control function.
Solution Approach 2:
The patent converts the potentially harmful UV radiation into a beneficial effect by using the UV absorber to selectively absorb UV energy. This absorbed UV energy would otherwise degrade the display components, but instead is captured by the UV absorber, protecting the light-emitting layer and stabilizing the color and transmittance properties of the reflection control layer.
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 proposed solution effectively minimizes the alteration of the color and transmittance of the reflection control layer due to sunlight, reducing fabrication costs and simplifying the process while maintaining effective reflection control.
Implementation Method 1
the reflection control layer comprises an UV absorber with at least one hydrophobic group
Implementation Method 2
a hydrophobic group is coupled to an UV absorber, and thus, the UV absorber can be positioned at the upper portion in the reflection control layer
Data Source
AI summary
A display device is provided. The display device comprises a thin-film transistor layer disposed on a substrate, a light emitting element layer disposed on the thin-film transistor layer, a touch sensing layer disposed on the light emitting layer, and a reflection control layer disposed on the touch sensing layer, wherein the reflection control layer includes a UV absorber, wherein the UV absorber includes at least one hydrophobic group, and/or the UV absorber is present as a concentration gradient in the reflection control layer.