Viewing Angle Adjustment Device with Auxiliary Light Conversion Layer
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Solution Overview
Problem
Existing viewing angle adjustment devices for large area display devices limit the viewing angle and luminance at the edge area, making it difficult to maintain user privacy while allowing the user in front to view the content effectively.
Innovation Solution
A viewing angle adjustment device with an auxiliary light conversion layer that includes a light absorption layer, a transparent layer, and a reflective layer, stacked in a specific pattern to refract and diffuse light, allowing a wider viewing angle to the edge area while maintaining privacy by blocking side views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a viewing angle adjustment device with partition walls is applied to a large area display device, then privacy protection is improved, but the viewing angle at the edge area is limited and luminance deteriorates
Solution Approach 1:
The patent applies different structures to different areas of the viewing angle adjustment device. The center area uses a first structure with partition walls for privacy protection, while the edge area uses a second structure with light conversion layers (including light absorbing, transparent, and reflective layers) to improve luminance and viewing angle. This local differentiation resolves the contradiction between privacy protection and edge area luminance.
Solution Approach 2:
The viewing angle adjustment device is segmented into multiple functional regions: a center area for privacy protection and an edge area for enhanced viewing. The auxiliary light conversion layer is further segmented into first patterns (with light absorbing and transparent layers) in the center area and second patterns (adding reflective layers) in the edge area. This segmentation allows each region to optimize for its specific function.
2Object-affected harmful factors
If partition walls are used to limit viewing angle, then privacy is protected, but the viewing angle for users at the edge area is restricted
Solution Approach 1:
Different viewing angle characteristics are provided for different regions. The center area maintains narrow viewing angle for privacy, while the edge area incorporates light conversion layers that broaden the viewing angle. This local quality differentiation allows the device to simultaneously protect privacy for front users and provide wide viewing angle for edge users.
Solution Approach 2:
The light conversion layer acts as an intermediary between the display panel and the edge area users. It includes light absorbing layers to block unwanted views, transparent layers to transmit light, and reflective layers to redirect light toward the viewer, thereby mediating the viewing angle characteristics in the edge area.
3Object-affected harmful factors
If a viewing angle adjustment device is applied to maintain privacy, then side views are blocked, but luminance at the edge area deteriorates
Solution Approach 1:
The auxiliary light conversion layer uses a composite structure combining light absorbing layers, transparent layers, and reflective layers. The light absorbing layer blocks side views, the transparent layer transmits light from the display panel, and the reflective layer redirects light toward the viewer. This composite material approach simultaneously achieves side view blocking and luminance enhancement at the edge area.
Solution Approach 2:
The edge area is equipped with a second structure including light conversion layers that are different from the center area's first structure. This local quality differentiation allows the edge area to have both side view blocking capability and improved luminance, while the center area maintains strong privacy protection.
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 enhances user privacy by allowing a wider viewing angle to the user in front and improving luminance at the edge area, preventing side views and addressing the limitations of existing devices.
Implementation Method 1
The reflective layer can refract a portion of light entering to the auxiliary light conversion layer after being emitted from the light conversion layer and emit refracted portion of light in an inward direction of the viewing angle adjustment device
Data Source
AI summary
A viewing angle adjustment device and a display device including the same are discussed. The viewing angle adjustment device can include a first protective layer, a second protective layer disposed on the first protective layer, a light conversion layer disposed between the first protective layer and the second protective layer and including dispersion liquid having dispersed floating particles, and an auxiliary light conversion layer disposed on the second protective layer. The auxiliary light conversion layer can include first patterns where a light absorbing layer and a transparent layer are disposed in a center area, and second patterns where the light absorption layer, the transparent layer and a reflective layer are disposed in an edge area.