Multi-Level Light Control Film for Display Viewing Angle Control
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Solution Overview
Problem
Existing display devices lack effective mechanisms to limit viewing angles, which can compromise privacy and image clarity in certain viewing conditions.
Innovation Solution
A display device design incorporating a light control film with specific light control patterns, including metal and light transmission patterns with undercut shapes, and light blocking patterns, arranged in a multi-level structure to control viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer light blocking structure is used, then the manufacturing process is simple, but the viewing angle control is insufficient
Solution Approach 1:
The light blocking structure is divided into multiple layers (first light blocking pattern and second light blocking pattern) with different heights and positions. This segmentation allows each layer to control light in different directions, achieving superior viewing angle control compared to a single-layer structure, while maintaining reasonable manufacturing complexity through systematic layering.
Solution Approach 2:
The patent transitions from a two-dimensional planar light blocking pattern to a three-dimensional multi-level structure by varying the heights of different light blocking patterns. This dimensional change enables control over light propagation in multiple spatial directions, significantly improving viewing angle control capability.
2Manufacturing precision
If the height of light blocking patterns is increased to improve viewing angle control, then viewing angle control improves, but the manufacturing complexity and difficulty increase
Solution Approach 1:
Instead of using one extremely tall light blocking pattern, the structure is segmented into multiple patterns of moderate heights (first light blocking pattern and second light blocking pattern at different levels). This segmentation achieves the same or better viewing angle control while keeping each individual pattern's height manageable and easier to manufacture.
Solution Approach 2:
The patent uses multiple light blocking patterns of moderate heights rather than one excessive-height pattern. This partial action approach (using several moderate structures) achieves the required light control function without the manufacturing difficulties associated with excessive height, and may even provide better control through the distributed structure.
3Manufacturing precision
If a multi-level light control structure is implemented, then viewing angle control and light management improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs preliminary patterning actions where mask patterns are formed first, followed by sequential etching processes. The first light blocking pattern is formed as a preliminary structure, then the second light blocking pattern is formed on top. This preliminary action approach organizes the complex multi-level manufacturing into manageable sequential steps, improving ease of manufacture compared to attempting to form the complete multi-level structure in a single complex process.
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 multi-level light control film effectively manages viewing angles, enhancing privacy and image clarity by controlling light transmission and reflection, while improving manufacturing efficiency.
Implementation Method 1
a refractive index of the first light transmission pattern for light in a wavelength range of about 380 nm to about 780 nm may be about 1 to about 2, and a refractive index of the second light transmission pattern for light in a wavelength range of about 380 nm to about 780 nm may be about 1 to about 2
Data Source
AI summary
A display device is disclosed that includes a substrate, a light emitting device disposed on the substrate, an encapsulation layer covering the light emitting device, a light control film disposed on the encapsulation layer and including a plurality of light control patterns, and each of the light control patterns includes a first metal pattern disposed on the encapsulation layer, a first light transmission pattern disposed on the first metal pattern, a second metal pattern disposed on the first light transmission pattern and overlapping the first metal pattern, a second light transmission pattern disposed on the second metal pattern and overlapping the first light transmission pattern, a first light blocking pattern disposed on the same layer as the first metal pattern and overlapping the first light transmission pattern, and a second light blocking pattern disposed on the same layer as the second metal pattern and overlapping the second light transmission pattern.