One-Way Transparent Optical System for Emissive Displays
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Solution Overview
Problem
Conventional optical systems for emissive display devices, such as OELDs, fail to effectively block external light while maintaining high luminous efficiency for internal light, leading to dazzling effects and contrast degradation due to the use of polarizers and λ/4 waveplates that restrict both internal and external light emission.
Innovation Solution
A one-way transparent optical system is fabricated using bead-shaped light absorbing elements or convex lens-shaped projecting structures with light absorbing materials, such as carbon black or black dye, dispersed or formed on a transparent substrate to refract and absorb external light while allowing nearly 100% of internal light to pass through, utilizing techniques like embossing, patterning, and emulsion polymerization to achieve this functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polarizer and λ/4 waveplate are used to block external light, then external light reflection is prevented, but internal light emission is restricted to less than 50%
Solution Approach 1:
The optical system is segmented into distinct functional layers: a light absorbing layer with bead-shaped elements for external light absorption, and a transparent film layer for internal light transmission. This segmentation allows each layer to specialize in one function, enabling external light blocking while maintaining internal light emission above 50%.
Solution Approach 2:
The light absorbing layer uses bead-shaped light absorbing elements with specific optical properties (high absorption coefficient) localized at the outer surface, while the inner transparent film maintains high transmission properties. This local quality differentiation enables selective light interaction: strong absorption for external light at the surface, and high transmission for internal light from the display.
2Object-affected harmful factors
If polarizer and λ/4 waveplate are used to prevent dazzling effect, then contrast degradation is prevented, but luminous efficiency decreases
Solution Approach 1:
The invention extracts only the essential light absorption function from the conventional polarizer-waveplate system. By using a dedicated light absorbing layer with bead-shaped elements, it removes the need for polarizing components that waste 50% of internal light, achieving dazzling effect prevention with minimal impact on luminous efficiency.
Solution Approach 2:
The light absorbing layer uses inexpensive materials (carbon black or black dye) in bead-shaped form factors that can be easily manufactured and applied. This replaces expensive polarizing films and waveplates, reducing overall system cost while maintaining effective external light blocking performance.
3Object-affected harmful factors
If conventional optical system with multiple layers is used, then external light is blocked, but device complexity increases
Solution Approach 1:
The invention merges the light absorption function and the protective film function into a single integrated optical system. The light absorbing layer is directly formed on the transparent film, combining multiple functions (external light blocking, internal light transmission, surface protection) into a unified structure, thereby reducing device complexity compared to separate polarizer and waveplate assemblies.
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 blocks external light reflections, preventing dazzling effects and contrast degradation while maintaining high brightness, increasing luminous efficiency to more than twice that of conventional systems, and reducing manufacturing costs by simplifying the structure and using inexpensive materials.
Implementation Method 1
forming bead-shaped light absorbing elements; dispersing the light absorbing elements over a soft transparent film
Implementation Method 2
forming convex lens-shaped projecting structures on the transparent substrate in which the light absorbing materials have been formed within the patterns, the projecting structures refracting incident light rays into the corresponding light absorbing materials
Data Source
AI summary
A method of fabricating a one-way transparent optical system designed to transmit almost 100% of internal light while effectively blocking radiation of external light. The method includes: forming bead-shaped light absorbing elements; dispersing the light absorbing elements over a soft transparent film; and curing the soft transparent film to fix the dispersed light absorbing elements onto the transparent film.