Light Collimation Device Lampshade Curved Reflecting Parts
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Solution Overview
Problem
Current display devices have a large light-emitting angle, resulting in low light utilization and a wide viewing angle, which is undesirable for privacy, especially when viewing confidential content.
Innovation Solution
A light collimation device comprising a lampshade with curved reflecting parts, total reflecting parts, and a light guiding part that collimates light by reflecting it in a controlled manner to enhance light utilization and reduce the viewing angle, integrated into a backlight module and display panel with a light extraction structure and liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional backlight is used with a large light-emitting angle, then the viewing angle is wide, but the light utilization rate is low and privacy is compromised
Solution Approach 1:
The lampshade is segmented into multiple functional zones: a curved reflecting part for light redirection, a first total reflecting part for directional reflection, and a second total reflecting part for additional light control. This segmentation allows each zone to perform a specific function in controlling light propagation, achieving both high light utilization and narrow viewing angle.
Solution Approach 2:
The curved reflecting part utilizes a curved surface geometry to redirect light from the light source. The curvature enables precise control of light reflection angles, transforming omnidirectional light emission into a more focused, collimated beam that improves light utilization while limiting the viewing angle for privacy protection.
2Illumination intensity
If light is emitted in all directions, then the viewing angle is large, but most light cannot be received by human eyes
Solution Approach 1:
Different regions of the lampshade are assigned different reflective properties: the curved reflecting part redirects light at specific angles, while the total reflecting parts ensure directional reflection. This local differentiation of optical properties allows the system to optimize light delivery to the viewer's position while restricting light propagation in other directions.
Solution Approach 2:
The invention changes the angular distribution parameter of emitted light from omnidirectional to a narrow, collimated beam. By using curved and total reflecting surfaces, the light emission pattern is transformed from uniform in all directions to concentrated within a specific angular range, improving both light reception efficiency and privacy control.
3Loss of energy
If a light collimation device with multiple reflecting parts is added, then light utilization is improved and viewing angle is narrowed, but device complexity increases
Solution Approach 1:
Multiple reflecting functions are merged into a single integrated lampshade structure. The curved reflecting part and total reflecting parts are combined in one component rather than using separate elements, achieving effective light collimation and angular control while maintaining a relatively simple overall structure that can be manufactured as a single piece.
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 light utilization and narrows the viewing angle, enhancing privacy by ensuring that only collimated light is directed to the viewer, thereby increasing the efficiency and reducing stray light.
Implementation Method 1
The curved reflecting part is configured to reflect light from a light source arranged at a focal point of the curved reflecting part to the first total reflecting part
Implementation Method 2
The first total reflecting part is configured to reflect part of light incident on the first total reflecting part to the second total reflecting part and directly direct another part of the light to the light guiding part
Implementation Method 3
The second total reflecting part is configured to reflect light incident on the second total reflecting part to the light guiding part
Implementation Method 4
The light guiding part is configured to cause the light incident on the light guiding part to propagate in total reflection
Data Source
AI summary
A light collimation device, a backlight module and a display panel are provided. The light collimation device includes a lampshade and a light guiding part, wherein the lampshade includes a plurality of curved reflecting parts, a first total reflecting part and a second total reflecting part. The curved reflecting part is configured to reflect part of light from a light source arranged at a focal point of curved reflecting part to the first total reflecting part. The first total reflecting part is configured to reflect part of incident light to the second total reflecting part and directly direct another part of light to the light guiding part. The second total reflecting part is configured to reflect incident light to the light guiding part. The light guiding part is configured to cause incident light to propagate in a total reflection.