Display Window Coating Stack for Polarizer-Free Reflection Control
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Solution Overview
Problem
Display devices with polarizing plates to prevent external light reflection suffer from reduced light efficiency, prompting the need for alternatives that can suppress reflection without using a polarizing plate while maintaining high display quality and durability.
Innovation Solution
A display device structure featuring a printed layer with a light blocking material, combined with multiple functional layers of magnesium fluoride, magnesium oxide, yttrium oxyfluoride, silicon dioxide, aluminum oxide, and a per-fluoro-alkyl compound, which are strategically positioned to reduce external light reflection and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to prevent external light reflection, then reflection is suppressed, but light efficiency is reduced
Solution Approach 1:
The invention divides the anti-reflection function into multiple separate layers: a printed layer with light blocking material and multiple functional layers (first through fourth) with different materials and refractive indices. Each layer segment contributes to the overall anti-reflection effect, allowing light efficiency to be improved while maintaining reflection suppression.
Solution Approach 2:
The invention uses composite material structures including a printed layer with light blocking material combined with functional layers made of different materials (magnesium fluoride, magnesium oxide, yttrium oxyfluoride, silicon dioxide, aluminum oxide, and per-fluoro-alkyl compounds). This composite structure achieves both anti-reflection and high light efficiency that a single polarizing plate cannot provide.
2Use of energy by moving object
If multiple functional layers are added to suppress reflection without polarizing plate, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The functional layers serve multiple functions simultaneously: they provide anti-reflection properties through refractive index management, protect the display panel through the printed layer with light blocking material, and maintain durability. This multi-functionality reduces the need for separate components, effectively managing complexity while improving light efficiency.
3Reliability
If functional layers are applied to enhance durability, then abrasion resistance and chemical resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The invention combines the anti-reflection function and durability enhancement into a single integrated structure. The printed layer with light blocking material and the functional layers work together to provide both optical performance and mechanical/chemical protection, eliminating the need for separate durability enhancement layers and simplifying the overall manufacturing process.
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 effectively suppresses external light reflection, improves display quality, and enhances the durability of the display device by providing high abrasion resistance, chemical resistance, and heat resistance, while maintaining desired reflective colors.
Implementation Method 1
a refractive index of the first functional layer may be in a range of about 1.3 to about 1.5, a refractive index of the second functional layer may be in a range of about 1.3 to about 1.5
Implementation Method 2
a printed layer disposed between the display panel and the window, where the printed layer includes a light blocking material
Implementation Method 3
the window structure may have high abrasion resistance, chemical resistance, and hardness
Data Source
AI summary
A display device includes a display panel including a substrate, a driving device disposed on the substrate, and a light emitting device disposed on the substrate and electrically connected to the driving device, a window disposed on the display panel, a printed layer disposed between the display panel and the window, where the printed layer includes a light blocking material, a first functional layer disposed between the display panel and the window, a second functional layer disposed on the window, a third functional layer disposed on the second functional layer, and a fourth functional layer disposed on the third functional layer.