Backlight Module Concentrating Structure for Mini LED Splicing
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Solution Overview
Problem
The splicing of mini LED lamp beads on multiple printed circuit boards in display technology results in uneven light emission due to incomplete overlap and light mixing at the splicing slits, leading to shadows and reduced light uniformity.
Innovation Solution
A backlight module with a concentrating structure featuring diverse protrusions and an optical film is used to refract and diffuse light, expanding the emissive direction and preventing moiré patterns, thereby enhancing light uniformity across the display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mini LED lamp beads are spliced on multiple PCBs, then the brightness and darkness of each mini LED lamp bead can be controlled individually to achieve high dynamic range imaging, but the splicing areas fail to be overlapped completely, producing slits with uneven light emission
Solution Approach 1:
A light mixing structure is introduced as an intermediary component between adjacent light-emitting units. This structure includes a light mixing cavity and a light mixing surface that receives light from multiple LED beads and redirects it through a reflective sidewall, allowing light from different PCB splicing areas to mix and fill in the dark regions caused by misalignment, thereby eliminating slits while preserving individual LED control capability
Solution Approach 2:
The light mixing structure is selectively positioned only in the dark regions or slit areas where light mixing is needed, rather than uniformly across the entire display. The light mixing cavity is specifically configured to receive light from adjacent light-emitting units and redirect it to fill local dark areas, addressing the splicing alignment problem locally without affecting the overall individual LED control functionality
2Illumination intensity
If thousands or tens of thousands mini LED lamp beads are arranged on a single PCB, then the brightness of the mini LED lamp beads improves to a large extent, but it is very difficult due to production process difficulties and yield issues
Solution Approach 1:
The display is divided into multiple separate PCB modules, each containing a manageable number of mini LED lamp beads (e.g., 9 beads per PCB in the embodiment). This segmentation makes the production process feasible and improves yield, as each PCB can be manufactured and tested independently before being spliced together to form the complete high-brightness display
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 the issue of uneven light emission by ensuring consistent light distribution across the display screen, eliminating shadows and improving the overall brightness and uniformity of the display.
Implementation Method 1
refraction of the light from a protrusion in the concentrating structure after the light emitted by the light-emitting units is emitted to the concentrating structure
Implementation Method 2
moiré patterns are not produced due to coherent interference from the light in the area
Data Source
AI summary
Disclosed are a backlight module and a display device. The backlight module includes a plurality of light-emitting units disposed at intervals with one another, an optical film, and a concentrating structure. A slit is between two adjacent light-emitting units. The optical film is disposed at a side of the light-emitting unit. The concentrating structure is disposed at a side of the optical film close to the light-emitting unit and arranged in an area opposite to the slit. The concentrating structure comprises a plurality of protrusions.