Display Stacked Body for Low Reflection in Folded Modes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies fail to improve visibility in usage modes where images are observed with display devices folded, and visibility issues persist in bent portions of flexible displays.
Innovation Solution
A stacked body for display devices comprising a substrate layer, a first layer, and a second layer, with specific luminous reflectance and refractive index properties to minimize light reflection and color differences between display regions, enhancing visibility in folded states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating film is applied to improve scratch resistance and hard coating property, then surface durability is improved, but interference fringes occur that reduce visibility
Solution Approach 1:
The patent applies a composite stacked body structure consisting of multiple layers (substrate layer, first layer, and second layer) with different materials and optical properties. This composite structure allows the first layer to provide scratch resistance while the second layer with specific refractive index (1.30-1.60) and thickness (50nm-5μm) compensates for interference effects, thereby maintaining visibility without sacrificing durability.
2Adaptability or versatility
If the display device is folded for compact usage, then portability is improved, but light reflection causes images to be reflected between display regions reducing visibility
Solution Approach 1:
The second layer acts as an intermediary optical element between the display panel and the external environment. By controlling its refractive index (1.30-1.60) and thickness (50nm-5μm), it mediates the light paths to prevent regular reflection from directing images between folded display regions, thereby enabling folded usage while maintaining visibility.
3Adaptability or versatility
If the observation angle varies in folded display mode, then viewing flexibility is improved, but color consistency deteriorates across different display regions
Solution Approach 1:
The patent applies different optical properties to different layers to address local requirements. The second layer with specifically controlled refractive index (1.30-1.60) and thickness (50nm-5μm) provides localized optical compensation that maintains color consistency across different display regions even when viewed at various angles in folded mode, while still allowing viewing angle flexibility.
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 reduces light reflection and color variation between display regions, improving visibility in folded display modes and bent portions, thereby enhancing the overall viewing experience.
Implementation Method 1
a luminous reflectance of regular reflection light, when light is entered to a second layer side surface of the stacked body for a display device with incident angle of 60°, is 10.0% or less
Implementation Method 2
an absolute value of a difference, between yellowness YI1 of transmitted light in 60° direction with respect to a normal line to the second layer side surface of the stacked body for a display device and yellowness YI2 of transmitted light in 15° direction
Implementation Method 3
in order to solve the problem of reduced visibility due to interference fringes caused by a hard coating film
Data Source
AI summary
The present disclosure provides a stacked body for a display device comprising a substrate layer, a first layer, and a second layer, in this order; wherein a luminous reflectance of regular reflection light, when light is entered to a second layer side surface of the stacked body for a display device with incident angle of 60°, is 10.0% or less; and an absolute value of a difference, between yellowness YI1 of transmitted light in 60° direction with respect to a normal line to the second layer side surface of the stacked body for a display device and yellowness YI2 of transmitted light in 15° direction with respect to a normal line to the second layer side surface of the stacked body for a display device, is 3.0 or less.