Reflective Sheet With Receiving Slot For LED Backlight Modules
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Solution Overview
Problem
Conventional backlight modules suffer from hotspot phenomena due to light leakage between LED light sources, leading to reduced light utilization efficiency and increased product costs, with existing solutions either requiring additional components or failing to effectively address the issue.
Innovation Solution
A reflective sheet with a specific structure, including a flat plate with light transmitting holes and bent extensions forming a receiving slot for the LED light sources, which reflects leaked light back to the light guide plate and simplifies the plastic frame design by eliminating protrusions, enhancing light utilization and structural adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple LED light sources are disposed separately in the backlight module, then the light source can be provided, but light leakage occurs at gaps between adjacent LED light sources causing hotspot phenomenon and reducing light utilization efficiency
Solution Approach 1:
The reflective sheet converts the harmful light leakage from LED gaps into beneficial reflected light that returns to the light guide plate. By positioning the reflective sheet at the bottom of the cavity, leaked light is reflected upward through the light guide plate, transforming waste light into useful illumination and eliminating hotspots.
Solution Approach 2:
The reflective sheet acts as an intermediary element between the LED light sources and the light guide plate. It mediates the light path by reflecting leaked light back toward the light guide plate, preventing direct light leakage and enabling indirect light distribution that eliminates hotspots while maintaining efficiency.
2Ease of manufacture
If protrusion structures are added to the plastic frame to receive LED light sources, then the LED light sources can be fixed, but the device complexity and product cost increase
Solution Approach 1:
The reflective sheet is integrated with the plastic frame by being disposed at the bottom of a cavity formed in the frame. This merging eliminates the need for separate protrusion structures, as the cavity itself provides the mounting function while the reflective sheet simultaneously performs light reflection, achieving multiple functions with a unified structure.
Solution Approach 2:
The plastic frame cavity serves multiple functions: it provides structural support, positions the LED light sources, and houses the reflective sheet. The reflective sheet itself serves dual purposes by both reflecting light and being positioned within the frame structure, eliminating the need for dedicated fixation protrusions.
3Illumination intensity
If the inner distance between LED light source and plastic frame is increased to eliminate dark regions, then light distribution improves, but the device structure becomes more complex
Solution Approach 1:
Instead of increasing horizontal distance, the solution creates a vertical dimension by forming a cavity in the plastic frame. The reflective sheet is positioned at the bottom of this cavity, allowing light to travel vertically and be reflected upward, achieving uniform light distribution through a different spatial dimension without complicating the overall structure.
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 reflective sheet increases light utilization by reflecting leaked light and simplifies the backlight module design, reducing the risk of hotspots and product costs by eliminating the need for protrusion structures in the plastic frame.
Implementation Method 1
a reflective sheet with a specific structure, including a flat plate with light transmitting holes and bent extensions forming a receiving slot for the LED light sources, which reflects leaked light back to the light guide plate
Data Source
AI summary
A reflective sheet, a backlight module and a display screen. The reflective sheet includes a first sheet body disposed between a light guide plate and LED light sources, a second and a third sheet bodies respectively formed by bending and extending from upper and lower edges of the first sheet body, a fourth sheet body formed by bending and extending from an edge of the third sheet body. The first, the third and the fourth sheet bodies are enclosed commonly to form a receiving slot where the LED light sources are disposed. The first sheet body has multiple light transmitting holes such that lights of the LED light sources can enter the light guide plate. A surface of the first sheet body except the light transmitting holes can reflect lights leaked from gap regions among the LED light sources back to the light guide plate to increase light utilization rate.