Prism Array Light Guiding Film for Backlight Efficiency
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Solution Overview
Problem
Conventional liquid crystal display backlight modules suffer from low light energy efficiency and inability to achieve local region brightness control, which limits their performance in providing high dynamic range and vivid display effects.
Innovation Solution
A light guiding film with prism bodies arranged in an array and a reflective dot layer is used, where the prism bodies refract and totally reflect light, reducing light mixing distance and increasing efficiency, and the reflective dot layer ensures uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional backlight modules are used, then the display can be illuminated, but the light energy efficiency is low and local region brightness control is impossible
Solution Approach 1:
The light guiding film is divided into multiple prism bodies arranged in an array, with each prism body independently controlling light in its local region. This segmentation enables local region brightness control while maintaining overall light efficiency through the reflective dot layer that directs light to specific areas.
Solution Approach 2:
Each prism body in the array has specific geometric properties (apex angle between 0-20 degrees) that create localized light control capabilities. The reflective dot layer is positioned at specific locations to provide localized reflection, enabling different regions of the display to have different brightness characteristics.
2Loss of time
If light guiding films with prism bodies are used, then light mixing distance is reduced, but the structure becomes more complex
Solution Approach 1:
Multiple prism bodies are merged into a single integrated light guiding film structure that functions as one cohesive unit. The reflective dot layer is integrated with the prism body array, combining multiple functions (light refraction, reflection, and direction control) into a single component assembly, which reduces overall system complexity despite the intricate internal geometry.
3Productivity
If the apex angle of the prism body space is made small (0-20 degrees), then light mixing efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The apex angle of the prism body spaces is optimized to a specific range (0-20 degrees) to achieve the desired balance between light mixing efficiency and manufacturability. This parameter optimization ensures that while the angle is small enough to provide effective light mixing, it remains within practical manufacturing capabilities.
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 light mixing and efficiency, eliminating hotspot phenomena and enabling better brightness uniformity and high dynamic range capabilities in display devices.
Implementation Method 1
The prism body is configured to refract light incident into the space to form refracted light
Implementation Method 2
the refracted light is totally reflected in the prism body to form total reflection light
Implementation Method 3
a reflective dot layer disposed on the second surface and configured to reflect the total reflection light such that the total reflection light is emitted through the first surface
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides a light guiding film. The light guiding film includes a plurality of prism bodies arranged as an array. Each of the plurality of prism bodies has a first surface and a second surface oppositely disposed. The first surface is a light exiting surface. A space is disposed between two adjacent prism bodies. The prism body is configured to refract light incident into the space to form refracted light, such that the refracted light is totally reflected in the prism body to form total reflection light.