Backlight Module With Segmented Reflecting Unit
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Solution Overview
Problem
Conventional direct-type backlight modules face challenges in reducing thickness and energy consumption while maintaining uniform light emission, as increasing LED density to achieve thinner designs leads to higher energy usage.
Innovation Solution
The implementation of a backlight module structure that includes a second reflecting unit with alternating transmitting and reflecting regions, a quantum dot layer, and a light guiding unit, which allows for efficient light distribution and color conversion without increasing LED density, thereby maintaining uniform light emission and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the back plate and the diffusion sheet is reduced to achieve thinner backlight module, then the thickness is reduced, but the LED density must be increased to maintain uniform light emission, which increases energy consumption
Solution Approach 1:
The reflecting film is segmented into multiple reflecting units with different reflecting rates (first reflecting units with higher reflecting rate, second reflecting units with lower reflecting rate). This segmentation allows different regions to serve different functions: high-reflecting regions concentrate light where needed, while low-reflecting regions allow light transmission, achieving uniform light distribution without increasing LED density or energy consumption.
Solution Approach 2:
Different regions of the reflecting film are assigned different reflecting rates based on their specific functional requirements. The first reflecting units with higher reflecting rates are positioned to reflect light back to specific areas, while second reflecting units with lower reflecting rates allow light to pass through. This local differentiation enables uniform light emission while maintaining lower LED density and energy consumption.
2Illumination intensity
If the LED density is increased to ensure uniform light emission in a thinner backlight module, then uniform light emission is achieved, but the energy consumption increases
Solution Approach 1:
The reflecting film is divided into multiple reflecting units with different reflecting rates. First reflecting units with higher reflecting rates redirect light to areas requiring more illumination, while second reflecting units with lower reflecting rates allow light transmission. This segmentation enables uniform light distribution across the display area without increasing LED density, thereby maintaining lower energy consumption.
Solution Approach 2:
Different regions of the reflecting film are assigned different reflecting rates according to their specific illumination requirements. This local quality differentiation ensures that each region receives appropriate light intensity, achieving overall uniformity without requiring increased LED density or energy consumption.
3Use of energy by stationary object
If the LED density is reduced to lower energy consumption, then energy consumption is reduced, but the uniformity of light emission deteriorates
Solution Approach 1:
The reflecting film is segmented into first reflecting units with higher reflecting rates and second reflecting units with lower reflecting rates. This segmentation compensates for the reduced LED density by strategically directing light from fewer LEDs to achieve uniform distribution across the display area, thereby maintaining light uniformity while reducing energy consumption.
Solution Approach 2:
Different regions of the reflecting film are assigned different reflecting rates to compensate for the reduced LED density. First reflecting units with higher reflecting rates redirect light to areas that would otherwise receive insufficient illumination, while second reflecting units allow light transmission. This local quality differentiation maintains uniform light emission even with lower LED density and energy consumption.
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
This configuration enables a thinner and more energy-efficient backlight module with uniform light intensity distribution, addressing the challenge of reducing thickness and energy consumption while ensuring effective light emission.
Implementation Method 1
a quantum dot layer above the LEDs and below the light guiding unit
Implementation Method 2
a light guiding unit above the quantum dot layer... allows for efficient light distribution
Implementation Method 3
a second reflecting unit with alternating transmitting and reflecting regions
Data Source
AI summary
A backlight module for an LCD display includes backlight units. Each backlight unit includes a backplane unit, a first reflecting unit on the backplane unit, an LED on the backplane unit extending through the first reflecting unit, and a light guiding unit on a side of the LED and the first reflecting unit away from the backplane unit. The light guiding unit is transparent. Each backlight unit further includes a second reflecting unit on a side of the light guiding unit away from the backplane unit. The second reflecting unit includes at least one reflecting region and at least one transmitting region. The reflecting region reflects light; the transmitting region allows light to pass through. At least one backlight unit comprises a quantum dot layer.