Backlight Module Seam Light Guide Plate for Mini LED Uniformity
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Solution Overview
Problem
Mini LED backlights experience significant light loss and dark line issues due to gaps between light plates, leading to non-uniform light output and display quality.
Innovation Solution
Incorporating a light guide plate and side light source at the seam between light plate assemblies, with the light guide plate being wider and thicker than the light plate assemblies, and a reflective sheet to ensure uniform light emission and reduce cluttered light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light plate splicing process is used to assemble multiple light plates, then the backlight module can be constructed with modular components, but light loss occurs at the gaps between light plates causing dark line problems
Solution Approach 1:
A light guide plate is introduced as an intermediary component at the seam between adjacent light plate assemblies. This light guide plate receives light from a side light source and guides it to fill the gap between light plates, preventing dark lines while preserving the modular assembly structure.
Solution Approach 2:
The gap between light plates, which originally causes light loss and dark lines, is converted into a location for placing the light guide plate. The side light source illuminates this gap area, and the light guide plate distributes the light to fill the seam, transforming the harmful gap into a beneficial light-filling region.
2Reliability
If gaps are left between adjacent light plate assemblies, then thermal expansion and manufacturing tolerances are accommodated, but dark lines appear due to light loss at the seams
Solution Approach 1:
The light guide plate acts as a mediator that fills the visual and optical gap between light plate assemblies. It provides continuous light emission at the seam, eliminating dark lines while allowing the physical gaps to remain for thermal and manufacturing tolerance accommodation.
Solution Approach 2:
The light guide plate is specifically positioned only at the seam regions between light plate assemblies, providing localized light filling where it is most needed. The main body portions of light plates maintain their original lighting function, creating different functional zones within the backlight module.
3Illumination intensity
If the width of the light guide plate is increased to better fill the seam, then light output uniformity is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The backlight module is segmented into distinct functional components: light plate assemblies for main illumination and a light guide plate for seam filling. This segmentation allows each component to be optimized independently and assembled in a systematic manner, reducing overall complexity despite the added light guide plate.
Solution Approach 2:
The light guide plate serves multiple functions: it fills the seam between light plates, provides additional light emission, accommodates the side light source, and allows for thermal expansion. This multi-functionality justifies its presence and helps simplify the overall design by consolidating several needs into one component.
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 effectively addresses dark lines and improves light output uniformity by vertically emitting light from the seam, enhancing display quality and maintaining local dimming capabilities.
Implementation Method 1
The side light source corresponds to the light guide plate, is located on the side of the light guide plate, and provides a light source for the light guide plate
Implementation Method 2
a reflective sheet to ensure uniform light emission and reduce cluttered light transmission
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes a back plate and a plurality of light plate assemblies arranged on the back plate, and there is a seam between every two adjacent light plate assemblies. The backlight module further includes at least one light guide plate and at least one side light source. The light guide plate is arranged at the seam. The side light source corresponds to the light guide plate, is located on the side of the light guide plate, and provides a light source for the light guide plate.