Backlight Module Optical Film Prism Microstructure Design
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Solution Overview
Problem
Conventional backlight modules face challenges in increasing light concentration at the light-exiting viewing angle and luminance at the normal viewing angle while maintaining flaw-concealing ability, due to the limitations of diffusion sheets with scattering particles that affect optical directivity and luminance.
Innovation Solution
A backlight module incorporating an optical film with parallel prisms and microstructures, such as pyramid facets, is used to enhance light directivity by concentrating light through the prisms and maintaining flaw-concealing effects by deflecting light through microstructures, thereby improving light condensing performance and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If diffusion sheet with scattering particles is used to uniformize light, then light uniformity is improved, but optical directivity deteriorates
Solution Approach 1:
The optical film is segmented into two distinct functional layers: a prism layer for light condensing and directivity control, and a microstructure layer for flaw concealing. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between light uniformity and optical directivity
Solution Approach 2:
Different regions of the optical film have different local qualities: the prism layer has high optical directivity for light condensing, while the microstructure layer has scattering properties for flaw concealing. This local differentiation allows the system to achieve both light uniformity and optical directivity in different areas
2Illumination intensity
If haze of diffusion sheet is reduced to increase directivity, then optical directivity is improved, but flaw-concealing effect deteriorates
Solution Approach 1:
The optical film separates the functions of light condensing and flaw concealing into two distinct layers. The prism layer maintains high directivity for light condensing without needing haze, while the microstructure layer provides the necessary scattering for flaw concealing, thus resolving the contradiction
Solution Approach 2:
The microstructure layer acts as an intermediary between the light guide plate and the prism layer, providing flaw concealing effect while allowing the prism layer to maintain high optical directivity for light condensing
3Ease of manufacture
If conventional diffusion sheets are used, then manufacturing simplicity is maintained, but light condensing performance deteriorates
Solution Approach 1:
The invention changes the structural parameters of the optical film from conventional diffusion sheets to a multi-layer structure with prisms and microstructures. This parameter change enables superior light condensing performance while maintaining compatibility with existing manufacturing processes for producing prism and microstructure layers
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 optical film design increases light directivity and luminance at the normal viewing angle, enhancing the backlight module's ability to concentrate light while maintaining effective flaw-concealing, leading to improved peep-proof effects and energy efficiency.
Implementation Method 1
The optical film is disposed to the light exiting surface, and includes plural parallel prisms and plural microstructures
Implementation Method 2
the common diffusion sheet has plural scattering particles, and the scattering particles can scatter the light and emit from the diffusion sheet
Data Source
AI summary
A backlight module includes a light guide plate, a light source, and an optical film. The light guide plate has a light incident surface and a light exiting surface opposite to the light incident surface, in which the light exiting surface has a normal line. The light source is adjacent to the light incident surface. The optical film is disposed to the light exiting surface and includes plural parallel prisms and plural microstructures. An extending direction of each of the prisms is perpendicular to the normal line, and each of the prisms faces the light exiting surface of the light guide plate. Each of the microstructures is located on a surface of the optical film which faces away from the light guide plate. Each of the microstructures has a pyramid structure with plural facets. The prisms are located between the microstructures and the light exiting surface.