Inclined Refractor Display Structure for Viewing Angle Control
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Solution Overview
Problem
Existing display devices lack effective control over the viewing angle of images displayed, which is crucial for applications like public displays and vehicle displays where privacy is a concern.
Innovation Solution
A display device design that includes a light emitting element layer, a light transmitting film with openings, a light blocking pattern within these openings, and a low refractive film with inclined refractors on top of the light transmitting film, which controls the viewing angle and enhances light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional display structure is used, then the device is simple to manufacture, but the viewing angle cannot be controlled
Solution Approach 1:
The display device is divided into multiple functional layers: light emitting element layer, light transmitting film, light blocking pattern, and low refractive film with refractors. Each layer performs a specific function, with the refractors segmented into discrete elements that independently control light extraction and viewing angle in different regions.
Solution Approach 2:
The refractors are configured with specific inclination angles relative to the substrate, introducing a dimensional aspect to light control. By adjusting the inclination angle of refractors in the low refractive film, the device controls viewing angle in the vertical dimension while maintaining a planar structure.
2Use of energy by moving object
If light extraction efficiency is improved through additional structures, then luminous efficiency increases, but device complexity increases
Solution Approach 1:
The low refractive film changes the refractive index parameter at the interface between the light transmitting film and the external environment. By creating a region with lower refractive index, more light can escape from the display device, improving light extraction efficiency without requiring complex additional optical elements.
Solution Approach 2:
The display device combines multiple materials with different optical properties: the light emitting element layer, the light transmitting film with high refractive index, and the low refractive film with refractors. This composite structure leverages the complementary properties of each material to achieve improved light extraction.
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 controls the viewing angle of the display device, improving its privacy features while also enhancing luminous and light extraction efficiencies.
Implementation Method 1
a low refractive film on the light transmitting film, the low refractive film having a second refractive index smaller than the first refractive index, and including refractors inclined to have an inclination angle with respect to an imaginary line perpendicular to an upper surface of the light transmitting film
Data Source
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AI summary
A display device includes: a light emitting element layer including at least one light emitting device to emit light; a light transmitting film on the light emitting element layer, the light transmitting film having a first refractive index, and defining openings; a light blocking pattern on the light emitting element layer and in the openings; and a low refractive film on the light transmitting film, the low refractive film having a second refractive index smaller than the first refractive index, and including refractors inclined to have an inclination angle with respect to an imaginary line perpendicular to an upper surface of the light transmitting film.