Transparent Substrate Optical Balance for Vehicle Displays
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Solution Overview
Problem
Existing transparent substrates for display devices, such as those used in vehicles, face challenges in balancing optical characteristics like resolution, reflection image diffusiveness, and sparkle, as improving one characteristic often compromises others, making it difficult to select a substrate that meets multiple requirements effectively.
Innovation Solution
An optical device is designed with a transparent substrate that meets specific index values for resolution, reflection image diffusiveness, and sparkle, using a method that quantifies these characteristics through defined measurements and calculations, ensuring a balance of optical properties suitable for automotive use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an anti-glare process is applied to the surface of the transparent substrate to enhance reflection image diffusiveness, then the anti-glare property is improved, but the resolution of the transparent substrate is lowered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the anti-glare process parameters to achieve an arithmetic average roughness (Ra) within the specific range of 0.03 μm to 0.5 μm. This controlled parameter change optimizes the balance between anti-glare property and resolution, resolving the contradiction by finding the optimal parameter range that satisfies both requirements simultaneously
2Adaptability or versatility
If multiple optical characteristics are considered simultaneously for selecting a transparent substrate, then the comprehensiveness of evaluation is improved, but the difficulty of selection is increased
Solution Approach 1:
The patent replaces the subjective, complex multi-criteria selection process with an objective quantitative evaluation system. By introducing specific measurement methods and numerical criteria for resolution, reflection image diffusiveness, and sparkle, the patent transforms the complex selection process into a systematic, measurable, and comparable framework, reducing selection difficulty while maintaining comprehensiveness
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 allows for the objective and quantitative evaluation of optical characteristics, enabling the selection of a transparent substrate that optimally balances resolution, reflection image diffusiveness, and anti-glare properties, enhancing visibility and reducing glare in vehicle displays.
Implementation Method 1
an object that is disposed in the vicinity can be reflected
Implementation Method 2
a method has been adopted that is for implementing an anti-glare process that is for forming an uneven shape on the surface of the transparent substrate
Implementation Method 3
the sparkle is for representing to what extent unevenness of a bright spot is observed that occurs when light (an image) from the display image passes through the transparent substrate, the light is reflected by the surface of the transparent substrate, and the scattered light beams mutually interfere
Data Source
AI summary
There is provided an optical device including a display device, and a transparent substrate that is disposed on a side of a display surface of the display device. When the transparent substrate is evaluated by using a three index values of a resolution index value T, a reflection image diffusiveness index value R, and a sparkle index value S, the following conditions are satisfied: the resolution index value T≤0.2, the reflection image diffusiveness index value R≥0.2, and the sparkle index value S≤60.