Buried Scattering Anti-Glare Layer for Display Glare Reduction
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Solution Overview
Problem
Glass display elements with anti-glare properties face challenges in reducing glare from ambient light, as traditional anti-glare treatments struggle to effectively address reflections from both the glass surface and internal interfaces within the display stack, leading to partial benefits and potential image distortion or haze.
Innovation Solution
A buried scattering anti-glare layer with transparent scattering elements, having an average lateral dimension of less than 50 μm, is placed between the front and back surfaces of the display element, providing low reflectivity and significant narrow-angle forward-scattering to reduce glare from internal reflections without degrading image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rough surface anti-glare treatment is applied to the glass cover, then glare from the front surface is reduced, but internal reflections from display interfaces are not adequately addressed and may create haze or sparkle
Solution Approach 1:
The anti-glare function is segmented into two distinct locations: a first anti-glare layer on the front surface of the glass cover and a second anti-glare layer within the display stack at a reflective interface. This segmentation allows each layer to address specific reflection sources independently, with the front surface layer handling external glare and the internal layer handling interface reflections, thereby preventing haze and sparkle without compromising image quality
Solution Approach 2:
A scattering layer is introduced as an intermediary element within the display stack, positioned between the reflective interface and the front surface. This scattering layer mediates the interaction between internal reflections and the viewer by diffusing reflected light in a controlled manner, reducing the visibility of internal interfaces while maintaining overall display clarity and preventing haze formation
2Object-affected harmful factors
If multiple anti-reflective layers are applied to reduce internal reflections, then reflectance is reduced, but the complexity of the display stack increases and may not adequately address glare from both front and internal surfaces
Solution Approach 1:
The patent merges anti-glare functionality into existing display components rather than adding separate anti-reflective layers. Specifically, the second anti-glare layer is integrated at a reflective interface within the display stack (such as between the backlight unit and polarizer or at the liquid crystal layer), combining the anti-glare function with existing structural elements. This approach reduces total reflectance from both front and internal surfaces while avoiding significant increases in display stack complexity
3Strength
If the glass cover is made stronger and more damage resistant, then durability is improved, but the ability to provide sufficient surface roughness for anti-glare properties becomes more difficult
Solution Approach 1:
The anti-glare treatment is segmented such that the primary rough surface is located on the rear side of the glass cover (facing the display stack) rather than the front surface. This segmentation allows the front surface to remain smooth and compatible with strong, damage-resistant glass materials, while the rear surface provides the necessary roughness for anti-glare properties. The scattering layer within the display stack further contributes to anti-glare functionality without requiring front surface modification
Solution Approach 2:
The anti-glare functionality is moved from the external dimension (front surface of glass cover) to the internal dimension (rear surface of glass cover and within the display stack). By placing the scattering layer and second anti-glare layer inside the display stack, the invention achieves anti-glare effects without modifying the front surface of the glass cover, thereby maintaining compatibility with strong, damage-resistant glass materials that are difficult to roughen
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 minimizes sparkle and haze, maintaining high contrast and readability by reducing reflective scattering while ensuring the display element remains transparent and maintains its strength and scratch resistance.
Implementation Method 1
a scattering anti-glare layer... comprises a plurality of scattering elements... provides an anti-glare effect for light reflected by interfaces within the display element
Data Source
AI summary
A display element for viewing a display such as, for example, a display on an electronic device. The display element comprises a transparent substrate and a scattering anti-glare layer located between a front surface and back surface of the display element, wherein the scattering anti-glare layer comprises a plurality of scattering elements. The scattering anti-glare layer has low reflectivity and provides an anti-glare effect for light reflected by interfaces within the display element.