Vehicle Display Stack With Metal Oxide UV Shielding
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Solution Overview
Problem
Display devices for vehicles face challenges in preventing ultraviolet ray-induced out-gassing, which leads to deterioration of organic layers and oxidation of common electrodes, resulting in pixel shrinkage, especially without the use of polarizing plates that increase manufacturing costs and reduce productivity.
Innovation Solution
A display device configuration that includes a metal oxide layer between the encapsulation layer and the light blocking layer, which absorbs ultraviolet light and reduces its incidence on the pixel defining layer, thereby minimizing out-gassing and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizing plate is attached to prevent ultraviolet ray-induced out-gassing, then the organic film is protected from deterioration, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The invention extracts and eliminates the polarizing plate from the display device structure, replacing it with a metal oxide layer that provides UV protection without the need for separate polarizing plate attachment processes, thereby improving productivity while maintaining protection functionality
Solution Approach 2:
The metal oxide layer serves multiple functions: it acts as both a protective layer against UV-induced out-gassing and as part of the encapsulation structure, replacing the specialized function of the polarizing plate with a multi-functional component that integrates protection into the existing device architecture
2Reliability
If a polarizing plate is attached to block ultraviolet rays, then oxidation of common electrode is prevented, but manufacturing complexity and time increase
Solution Approach 1:
The invention merges the UV protection function with the encapsulation layer by incorporating a metal oxide layer into the existing encapsulation structure, eliminating the need for a separate polarizing plate and its attachment process, thereby reducing device complexity and manufacturing steps
3Reliability
If ultraviolet rays are blocked by a polarizing plate, then pixel shrinkage is reduced, but manufacturing cost increases
Solution Approach 1:
The invention replaces the expensive polarizing plate with a cost-effective metal oxide layer that can be deposited as a thin film during the encapsulation process, providing the same UV protection function at lower material and manufacturing costs
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 effectively reduces pixel shrinkage and maintains the integrity of the organic layer and common electrode, enhancing the durability and performance of the display device without the need for a polarizing plate.
Implementation Method 1
a metal oxide layer disposed on the encapsulation layer and overlapping the pixel defining layer... which absorbs ultraviolet light and reduces its incidence on the pixel defining layer
Data Source
AI summary
A display device for a vehicle and a vehicle including the display device are provided. The display device for a vehicle includes a substrate, a light emitting element layer disposed on the substrate and including a pixel electrode, an organic layer, and a common electrode, a pixel defining layer disposed on the substrate and including a plurality of openings exposing a portion of the pixel electrode, an encapsulation layer disposed on the light emitting element layer, a metal oxide layer disposed on the encapsulation layer and overlapping the pixel defining layer, a light blocking layer disposed on the metal oxide layer and overlapping the metal oxide layer, and a color filter layer disposed on the light blocking layer and the encapsulation layer.