Optical Film Merging Light Blocking and Prism Structures
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Solution Overview
Problem
Conventional optical films used in displays, especially in small electronic devices like smartphones, face challenges such as narrow viewing angles, reduced brightness, and increased power consumption due to the thickness and absorption layers, as well as complexities in assembly and moiré effects.
Innovation Solution
An optical film with a single sheet configuration is achieved by laminating a light-shielding pattern layer with a prism structure, which minimizes brightness loss, reduces the viewing angle, and simplifies assembly by condensing light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple optical sheets are laminated to reduce viewing angle, then viewing angle control is improved, but thickness increases and brightness decreases
Solution Approach 1:
The patent combines the light-blocking function and light-redirection function into a single integrated optical film structure. The light-blocking pattern layer and prism structure work together in one sheet to achieve viewing angle control without requiring multiple separate laminated sheets, thereby maintaining brightness while controlling the viewing angle.
Solution Approach 2:
The optical film is divided into functional zones: light-blocking patterns (louvers) that control horizontal viewing angles and prism structures that control vertical viewing angles. This segmentation allows independent optimization of each function within a single sheet, achieving effective viewing angle control without the thickness penalty of multiple laminated sheets.
2Ease of manufacture
If multiple optical sheets are laminated to reduce viewing angle, then viewing angle control is improved, but assembly time increases
Solution Approach 1:
The patent merges multiple optical functions (light blocking and light redirection) into a single optical film sheet, eliminating the need to laminate multiple separate sheets. This integration significantly reduces assembly time and complexity while maintaining effective viewing angle control in the display device.
3Ease of manufacture
If absorption layer is added to control viewing angle, then viewing angle is reduced, but power consumption increases to compensate for brightness loss
Solution Approach 1:
The patent combines light-blocking patterns and prism structures in a single optical film to achieve viewing angle control without requiring additional absorption layers that would reduce brightness. By using the geometric structure of louvers and prisms together, the system maintains higher light transmittance, reducing the need for increased backlight power consumption.
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 proposed optical film design enhances brightness, narrows the viewing angle, and reduces the thickness of the backlight module, thereby improving privacy protection while maintaining display functionality with reduced power consumption.
Implementation Method 1
a light blocking pattern layer disposed under the first base film and including a plurality of light absorption patterns arranged along a first direction
Implementation Method 2
a prism structure disposed under the second base film where the prism structure includes a plurality of prisms arranged along a second direction inclined at 80° to 100° with respect to the first direction
Data Source
AI summary
An optical film is provided. The optical film includes a mat layer including a plurality of protrusions, a first base film disposed under the mat layer, a light blocking pattern layer disposed under the first base film and including a plurality of light absorption patterns arranged in a first direction, an adhesive layer disposed under the light blocking pattern layer, a second base film attached to the light blocking pattern layer using the adhesive layer, and a prism structure disposed under the second base film where the prism structure includes a plurality of prisms arranged along a second direction inclined at 80° to 100° with respect to the first direction.