Backlight Module Reflection Sheet for Light Efficiency
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Solution Overview
Problem
Current display devices face challenges in reducing the lower border width due to the thickness of the backlight module components, which affects the screen-to-body ratio and light efficiency, leading to reduced front display brightness.
Innovation Solution
A backlight module design featuring a substrate with a reflection sheet, fluorescent film, diffusion film, and brightness enhancement film, where the reflection sheet reflects light towards the light emission direction, enhancing light efficiency and front display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a direct-type backlight module is used with mini-LEDs arranged at smaller spacing to reduce light mixing distance, then the backlight module thickness is reduced, but the number of lamp sources increases occupying larger area and light reflected by BEF cannot be reused, reducing light efficiency
Solution Approach 1:
The patent converts the harmful effect of light being reflected away from the display by the BEF into a beneficial effect by introducing a reflection sheet that redirects this reflected light back through the BEF toward the display. This transforms wasted light into useful light, improving light efficiency without increasing the number of lamp sources or the backlight module thickness
Solution Approach 2:
The patent segments the reflection function by introducing a separate reflection sheet component with specific reflective regions positioned between the lamp sources and the BEF. This segmented approach allows selective reflection of light in specific areas while maintaining the thin profile of the backlight module
2Length of stationary object
If more lamp sources are arranged at smaller spacing to satisfy brightness requirements, then the required light mixing distance is reduced enabling thinner design, but the lamp sources occupy larger area and light efficiency is reduced
Solution Approach 1:
The reflection sheet converts the harmful effect of light being lost after reflection from the BEF into a beneficial effect by redirecting this light back through the BEF. This allows using fewer lamp sources while maintaining brightness requirements, as the reflected light is reused rather than wasted
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 improves light efficiency and front display brightness by reusing reflected light, allowing for a thinner and more efficient backlight module that enhances the display device's overall performance.
Implementation Method 1
The reflection sheet is configured to reflect light propagated toward the substrate so that the light is reflected along a light emission direction of the plurality of lamp sources
Implementation Method 2
a fluorescent film, covering the plurality of lamp sources and the reflection sheet
Data Source
AI summary
The present disclosure discloses a backlight module and a display device. The backlight module includes a substrate; and a plurality of lamp sources, a fluorescent film, a diffusion film, and a brightness enhancement film carried on the substrate. The fluorescent film, the diffusion film and the brightness enhancement film are sequentially arranged in a light emission direction of the plurality of lamp sources, and the substrate is provided with a reflection sheet configured to reflect light propagated toward the substrate.