Diffractive Antiglare Layer for Multi-Layered Display Readability
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Solution Overview
Problem
Multi-layered displays, particularly those used in vehicular dashboards, suffer from glare-induced reduction in readability due to external bright light, which existing antiglare solutions often address inadequately by blurring images behind the top layer.
Innovation Solution
A multi-layered display system with a diffraction pattern antiglare layer on the outermost surface of the upper display screen, configured to blur ambient reflections without affecting transmitted light, maintaining image clarity by ensuring a reflective specular/haze ratio of about one at 0.55 µm, thereby reducing back-screen blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional antiglare coatings are applied to multi-layered displays, then glare is reduced, but images on the back screen become blurred
Solution Approach 1:
The patent applies different optical properties to different spatial locations of the antiglare layer. The diffraction pattern creates localized phase shifts that selectively scatter reflected light while leaving transmitted light paths relatively unaffected, achieving spatially differentiated optical treatment that reduces glare without blurring back-screen images
Solution Approach 2:
The patent modifies the optical parameters of the antiglare layer by introducing a specific diffraction pattern with controlled phase depth (approximately one-quarter wavelength). This parameter change in the layer's optical structure enables selective scattering of reflected light while maintaining transmission characteristics that preserve back-screen image clarity
2Object-affected harmful factors
If diffusion is used to breakup reflected light, then glare is reduced, but the coherence of transmitted light is also affected
Solution Approach 1:
The patent segments the optical treatment function by creating a diffraction pattern with discrete phase-modulated regions rather than uniform diffusion. This segmentation allows selective scattering of reflected light paths while preserving the coherence of transmitted light paths that pass through different regions of the pattern
Solution Approach 2:
The diffraction pattern acts as an intermediary optical element that mediates between reflected and transmitted light. It introduces controlled phase shifts that scatter reflected light to reduce glare while maintaining sufficient coherence in transmitted light to preserve image quality on the back screen
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 enhances readability in bright light conditions by minimizing glare-induced blur while maintaining the clarity of images displayed on both layers, ensuring clear and comfortable viewing.
Implementation Method 1
An antiglare layer is disposed on the upper display screen so as to be an outermost layer. The antiglare layer includes a diffraction pattern configured to blur ambient reflections without substantially affecting transmitted light
Data Source
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AI summary
A multi-layered display including an upper display screen, and a lower display screen arranged so as to at least partially overlap with the upper display screen is described. An antiglare layer is disposed on the upper display screen. The antiglare layer includes a diffraction pattern configured to blur ambient reflections without substantially affecting transmitted light. The diffraction pattern may have a quarter wavelength thickness. Method for forming the multi- layered display is also provided.