Optical Functional Thin Film Viewing Angle Refraction
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Solution Overview
Problem
Liquid crystal display (LCD) devices have narrow viewing angles, leading to picture distortion and brightness/color deviation issues, which are exacerbated in multi-viewer environments like smart classrooms, necessitating an improvement in brightness and color deviation viewing angles.
Innovation Solution
An optical functional thin film with a specific structure comprising a release layer, bonding layer, substrate layer, optical structure layer, and filling layer, featuring a refractive index difference and microstructures, is applied externally to LCDs to enhance viewing angles by refracting light and reducing color deviation fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If an optical functional thin film with refractive index difference is applied externally to LCD, then the brightness viewing angle is improved, but the device complexity increases
Solution Approach 1:
The patent applies an optical functional thin film as an intermediary layer between the LCD screen and the viewer. This thin film contains an optical structure layer with specific refractive index differences that mediates light transmission and refraction, thereby improving the brightness viewing angle without modifying the LCD internal structure. The thin film serves as a mediator that solves the viewing angle problem while maintaining simplicity of the original LCD device.
Solution Approach 2:
The patent utilizes a flexible thin film structure that can be applied externally to the LCD screen. The thin film includes a substrate layer, optical structure layer, and filling layer, which together form a flexible optical component that conforms to the screen surface. This approach avoids complex internal modifications while achieving the desired optical effect through a simple external thin film application.
2Illumination intensity
If the refractive index difference between optical structure layer and filling layer is increased, then the light refraction effect is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the refractive index parameters of the optical structure layer and filling layer to achieve the desired light refraction effect. By carefully selecting and controlling the refractive index values (N1 for optical structure layer, N2 for filling layer), the patent enhances light refraction while managing manufacturing precision requirements. The patent specifies that N1 > N2, creating an optimal parameter combination that balances optical performance with manufacturability.
3Length of moving object
If the optical functional thin film is applied to improve color deviation viewing angle, then the viewing angle is improved, but the device complexity increases
Solution Approach 1:
The optical functional thin film serves as an intermediary that addresses color deviation viewing angle issues. The thin film's optical structure layer with specific refractive index characteristics mediates the light path and reduces color deviation effects across different viewing angles. This external thin film approach improves color deviation performance without requiring complex internal modifications to the LCD structure.
Solution Approach 2:
The patent employs a flexible thin film structure that can be applied externally to improve color deviation viewing angle. The thin film includes optimized layers (substrate, optical structure, and filling layers) that work together to correct color deviation while maintaining a simple, adaptable form factor that conforms to the screen surface without adding significant structural complexity.
4Stability of the object's composition
If the surface of the filling layer has a fluctuating structure, then the uniformity of brightness and color deviation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent introduces a fluctuating surface structure on the filling layer to create local variations in optical properties. This local quality modification helps distribute and uniformize the brightness and color deviation characteristics across different viewing angles. The fluctuating structure creates localized optical effects that collectively improve overall uniformity without requiring extreme manufacturing precision across the entire surface.
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 significantly improves the brightness and color deviation viewing angles of LCDs, providing a more uniform viewing experience with reduced abrupt changes, thus enhancing subjective perception, particularly in environments with varied viewer positions.
Implementation Method 1
There is a refractive index difference between the optical structure layer and the filling layer, which causes refraction of light and increases the viewing angle.
Data Source
AI summary
An optical functional thin film, sequentially comprising a release layer (05), a bonding layer (04), a substrate layer (01), an optical structure layer (02) and a filling layer (03). The optical structure layer (02) refracts light to increase a viewing angle. A surface of the filling layer (03) is provided with a fluctuating structure. The optical functional thin film can be used for being externally attached to the outer side of a screen of a liquid crystal display device, and is used for alleviating the defect of horizontal or vertical brightness viewing angles of existing liquid crystal display devices being narrow (small); and the fluctuation of a color cast value viewing angle curve is relatively low, such that the subjective feeling during the use of the liquid crystal display device to which the optical functional thin film is attached is better.