Light Source Assembly Using High-Haze Diffuser Film for Dynamic Contrast
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Solution Overview
Problem
Current light source assemblies face challenges in achieving high dynamic contrast due to the 'halo effect' caused by light reflection, which blurs the distinction between bright and dark regions, leading to a deteriorated viewing experience.
Innovation Solution
Incorporating an optical film and a diffuser film with a haze greater than 85% and a thickness between 0.04 mm to 0.35 mm, positioned between the display panel and the light-emitting element, to reduce light reflection and enhance light uniformity, thereby minimizing the halo effect and improving dynamic contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light source assembly structure is used, then the device is simple and easy to manufacture, but the dynamic contrast is poor due to the halo effect caused by light reflection
Solution Approach 1:
The light source assembly is segmented into multiple functional layers: a light-emitting element layer, an optical film layer, and a diffuser film layer. This segmentation allows each layer to perform its specific function (light emission, light management, and light diffusion) independently, thereby improving dynamic contrast by controlling light reflection and distribution while maintaining manufacturing feasibility through modular assembly.
Solution Approach 2:
An optical film is introduced as an intermediary component between the light-emitting element and the diffuser film. This intermediary layer manages light transmission and reflection properties, helping to reduce the halo effect by controlling the path of reflected light, thus improving dynamic contrast without requiring complete redesign of the entire structure.
2Illumination intensity
If the haze of the diffuser film is increased to reduce the halo effect, then the dynamic contrast improves, but the light transmission may be reduced
Solution Approach 1:
The haze parameter of the diffuser film is optimized to a specific range (greater than 85% but controlled within certain limits) and the thickness is precisely controlled (0.04 mm to 0.35 mm). This parameter optimization ensures sufficient light diffusion to reduce the halo effect and improve dynamic contrast, while preventing excessive haze that would cause unacceptable light transmission loss and reduce overall brightness.
Solution Approach 2:
The diffuser film is designed with specific local properties (high haze in a controlled range) that are applied only where needed to reduce the halo effect, while the overall structure maintains good light transmission. This localized optimization of film properties allows improvement of dynamic contrast without sacrificing overall light efficiency.
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 the halo size and enhances light uniformity, allowing for clearer distinction between bright and dark regions, thereby improving the dynamic contrast and overall viewing experience.
Implementation Method 1
a diffuser film at least partially overlapped with the optical film, wherein a haze of the diffuser film is greater than 85%
Implementation Method 2
The optical film and the diffuser film are capable of transmitting at least a part of light emitted from the light-emitting element
Data Source
AI summary
A light source assembly is provided, including a substrate; a light-emitting element disposed on the substrate; and an optical film at least partially overlapped with the substrate. A diffuser film is at least partially overlapped with the optical film, wherein a haze of the diffuser film is greater than 85%, and a thickness of the diffuser film ranges from 0.04 mm to 0.35 mm. The optical film and the diffuser film are capable of transmitting at least a part of light emitted from the light-emitting element.