LCD Backlight Reflective Filter Layout for Mini LED Light Loss
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) using mini LEDs experience significant light loss and reduced brightness due to the decrease in reflective film coverage, leading to increased power consumption and decreased competitiveness against edge-lit LED backlight architectures.
Innovation Solution
Incorporation of a reflective filter film that allows light within a specific wavelength range to pass through while blocking and reflecting other wavelengths, combined with a wavelength conversion film to convert light to a usable spectrum, enhancing light utilization efficiency and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If mini LEDs are used with increased packing density, then the backlight module can achieve higher resolution and smaller size, but the reflective film coverage area is significantly decreased leading to reduced light utilization
Solution Approach 1:
The patent introduces a new dimension by placing a reflective layer on the bottom surface of the backlight module, perpendicular to the traditional side-mounted reflective film. This dimensional change allows light reflection without occupying lateral space, thus maintaining high packing density of mini LEDs while improving light utilization efficiency
Solution Approach 2:
The bottom reflective layer serves multiple functions: it reflects light that would otherwise be lost, provides structural support for the backlight module, and enables the use of mini LEDs with high packing density. This multi-functionality resolves the contradiction between compact size and light efficiency
2Ease of manufacture
If conventional direct-lit LED backlight architecture is used, then the structure is simple and easy to manufacture, but light loss occurs when n-polarized light beams do not encounter the reflective film
Solution Approach 1:
The patent extracts the reflective function from the side-mounted film and relocates it to the bottom surface. This separation allows the main body of the backlight module to maintain simplicity while the bottom layer provides enhanced light reflection, reducing light loss without complicating the overall manufacturing process
Solution Approach 2:
The bottom reflective layer acts as an intermediary that captures and redirects light beams that would otherwise be lost. This intermediary element resolves the contradiction by adding light reflection capability without significantly increasing manufacturing complexity
3Loss of energy
If reflective film is used to prevent light leakage between LEDs, then light utilization is improved, but the coverage area is insufficient when mini LEDs are densely packed
Solution Approach 1:
The patent moves the reflective surface from the horizontal plane (side-mounted) to the vertical plane (bottom surface). This dimensional transformation allows the reflective area to scale with the entire bottom surface rather than being limited by lateral spacing between densely packed mini LEDs
Solution Approach 2:
The patent changes the geometric parameter of the reflective surface from a limited side-mounted area to an extensive bottom surface area. This parameter change enables sufficient reflective coverage even when mini LEDs are densely packed, preventing light leakage without being constrained by lateral dimensions
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 enhances light source utilization, prevents light loss, and increases image display brightness with lower power consumption.
Implementation Method 1
the reflective filter film is capable of at least partially blocking light beams within a second wavelength range from passing therethrough and reflecting the light beams within the second wavelength range
Implementation Method 2
the wavelength conversion film is capable of converting a wavelength of the first light to form a second light
Data Source
AI summary
A liquid crystal display includes a backlight module, a reflective filter film, and a wavelength conversion film. The backlight module includes a plurality of light-emitting diodes that can emit a first light. The reflective filter film is disposed on the backlight module to receive the first light. The reflective filter film allows light beams within a first wavelength range to at least partially pass therethrough. The first wavelength range is between 370 nanometers and 450 nanometers. The reflective filter film can at least partially block light beams within a second wavelength range from passing therethrough and reflecting the same. The second wavelength range is between 450 nanometers and 900 nanometers. The wavelength conversion film is disposed on a side of the reflective filter film away from the backlight module, and can convert a wavelength of the first light to form a second light.