Multi-View Display Optics to Limit Reverse Viewing Angles
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Solution Overview
Problem
Display devices with a multi-view function suffer from reverse viewing issues when viewed at angles outside the assumed viewing angle range, necessitating a solution to limit the angular range of output light to a range closer to the assumed viewing angle.
Innovation Solution
A display device configuration featuring a first and second optical member with convex lens parts arranged orthogonally to the facing direction, line symmetrically inclined, and combined with a collimator and Fresnel lens to control light paths, ensuring light emission within the desired viewing angle range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is designed with a multi-view function to output different images to multiple viewpoints, then the viewing angle range is expanded, but reverse viewing occurs when viewed at angles outside the assumed viewing angle range
Solution Approach 1:
The optical system is divided into multiple optical members (first optical member, second optical member, and light source part) with specific convex lens parts arranged in orthogonal directions. Each optical member segments the light path control function, with the first optical member handling one set of viewing angles and the second optical member handling another set, thereby preventing reverse viewing while maintaining multi-view capability
Solution Approach 2:
The convex lens parts in the first and second optical members are arranged asymmetrically with respect to the facing direction. The first optical member has convex lens parts inclined in a first direction orthogonal to the facing direction, while the second optical member has convex lens parts inclined in a second direction orthogonal to the facing direction and the first direction. This asymmetric arrangement ensures that light is directed only within the assumed viewing angle range, preventing reverse viewing
2Object-affected harmful factors
If the angular range of output light is limited to a range closer to the assumed viewing angle range, then reverse viewing is prevented, but the viewing angle range is reduced
Solution Approach 1:
The patent introduces a new dimension of optical path control by adding the light source part with convex lens parts arranged in a direction orthogonal to both the first and second directions. This creates a three-dimensional optical control system where light paths are constrained in multiple orthogonal directions simultaneously, allowing the angular range to be limited in a way that prevents reverse viewing while maintaining the assumed viewing angle range
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 reduces reverse viewing and enhances multi-view functionality by aligning light emission with the intended viewing angle range, improving image clarity and reducing cross-talk between viewpoints.
Implementation Method 1
Each of the first optical member and the second optical member includes a plurality of convex lens parts arranged in a first direction orthogonal to the facing direction, the convex lens parts each having a curvature in the first direction and no curvature in an extending direction
Implementation Method 2
a light source part that is provided on an opposite side to the display panel with the second optical member interposed therebetween and is configured to emit light an optical path of which is along a facing direction
Data Source
AI summary
A display device includes a display panel having a display area in which a plurality of pixels are provided, a first optical member provided on a display surface side of the display panel so as to cover the display area, a second optical member provided on an opposite side to the first optical member with the display panel interposed therebetween, and a light source part that is provided on an opposite side to the display panel with the second optical member interposed therebetween and is configured to emit light an optical path of which is along a facing direction in which the first optical member and the second optical member face each other.