Backlight Module Optical Microstructures Luminance Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight modules for non-self-luminous displays face challenges in achieving high luminance while reducing power consumption and thickness, with manufacturing difficulties and costs being significant barriers.
Innovation Solution
A backlight module design incorporating a light guide plate, an optical film with specific optical microstructures, and two prism sheets, where the optical film and prism sheets are strategically positioned to enhance light collection and extraction, reducing the overall thickness and improving luminance gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight module uses conventional optical structures, then the manufacturing process is simple, but the luminance gain is insufficient
Solution Approach 1:
The optical film is divided into multiple functional layers: a first optical microstructure layer for light extraction, a second optical microstructure layer for light redirection, and a diffusion layer for uniform light distribution. Each layer performs a specific optical function, allowing the system to achieve high luminance gain through coordinated action of segmented optical elements rather than a single complex structure.
Solution Approach 2:
The patent introduces vertical stacking of multiple optical layers with different microstructure orientations (first layer with horizontal microstructures, second layer with vertical microstructures). This multi-dimensional arrangement of optical elements enables light to be manipulated in multiple directions simultaneously, achieving superior luminance extraction compared to conventional single-plane optical structures.
2Length of stationary object
If the backlight module thickness is reduced, then the display device becomes thinner, but the light extraction efficiency decreases
Solution Approach 1:
The patent employs ultra-thin optical films with integrated microstructures that provide high light extraction efficiency in a minimal thickness. The optical microstructures are formed directly on thin substrate layers, eliminating the need for thick conventional diffusers and allowing the backlight module to achieve both thinness and high light extraction efficiency simultaneously.
Solution Approach 2:
The patent optimizes the geometric parameters of optical microstructures (size, shape, spacing, and orientation) to maximize light extraction efficiency within a reduced thickness. By carefully controlling the scale and configuration of microstructures, the system achieves enhanced optical performance without increasing the overall module thickness.
3Illumination intensity
If the backlight module uses high power consumption to achieve high luminance, then the display brightness is sufficient, but the energy consumption increases and battery life decreases
Solution Approach 1:
The optical microstructures and diffusion layers are designed to passively redirect and distribute light without requiring additional power consumption. The structured optical surfaces automatically guide light from the LED sources to achieve uniform high brightness across the display area, eliminating the need for active light management systems that would consume additional energy.
Solution Approach 2:
The patent optimizes the optical parameters of the light guide plate and optical films to maximize light transmission efficiency. By adjusting the refractive indices, microstructure geometries, and layer configurations, the system minimizes light loss and maximizes the utilization of LED output, thereby achieving high display brightness with reduced power consumption from the light source.
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 design achieves a luminance gain of 182% and reduces power consumption, improving the brightness and light extraction efficiency of the display device while simplifying manufacturing and reducing costs.
Implementation Method 1
The optical film includes a substrate and a plurality of optical microstructures. Any one of the plurality of optical microstructures includes a first inclined surface and a second inclined surface, there is a first base angle between the first inclined surface and the surface, and there is a second base angle between the second inclined surface and the surface of the substrate, wherein the first base angle and the second base angle are between 50 degrees and 70 degrees.
Implementation Method 2
The plurality of prism structures of the first prism sheet have a first extending direction, and the plurality of prism structures of the second prism sheet have a second extending direction. An angle range of an included angle between the extending direction of the plurality of optical microstructures and the first extending direction is 85 degrees to 95 degrees.
Data Source
AI summary
A backlight module includes a light guide plate, a light source, an optical film, and first and second prism sheets. The light source and the optical film are respectively located on a light incident surface and a light exit surface of the light guide plate. The optical film includes a substrate and optical microstructures including first and second inclined surfaces and having an extending direction parallel to the light incident surface. There are respectively first and second base angles between the first and second inclined surfaces and a surface of the substrate. An angle range of the first and second base angles is 50 to 70 degrees. The first and second prism sheets t each have prism structures. An angle range of an included angle between extending directions of the optical microstructures and the prism structures is 85 to 95 degrees. A display device having the backlight module is proposed.