Backlight Module Optical Film for Uniform Brightness
Solution Overview
Problem
In large-scale display devices using mini LEDs and micro LEDs, the splicing gap between substrates cannot emit light, resulting in strip black lines and uneven display brightness due to the fluorescent film's inability to fully cover the edges of the substrates.
Innovation Solution
A backlight module with a backplate and adjacent substrates featuring light-emitting diodes and fluorescent films, where an optical film or light diffusion film is used to cover the gaps between the fluorescent films, with a width greater than the gap, to collect and refract light for uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If substrates are spliced together to form large-scale display devices, then the display size is increased, but splicing gaps between substrates cause strip black lines and uneven brightness
Solution Approach 1:
The patent extracts and addresses the splicing gap problem by introducing a reflective layer specifically positioned at the gap locations between substrates. This targeted approach removes the harmful effect of gaps without requiring redesign of the entire substrate structure, allowing large-scale displays to maintain uniform brightness despite the presence of splicing gaps.
Solution Approach 2:
The patent converts the harmful splicing gaps into beneficial reflective zones by applying reflective material at these locations. The gaps, which originally caused dark lines, are transformed into light-redirecting structures that improve overall illumination uniformity. This principle turns the unavoidable presence of splicing gaps from a defect into a functional feature that enhances display quality.
2Illumination intensity
If fluorescent film is used to cover light-emitting diodes, then light emission is achieved, but the fluorescent film cannot fully cover edges of substrates resulting in black lines
Solution Approach 1:
The patent introduces a reflective layer as an intermediary element between the fluorescent film and the substrate gap. This reflective layer compensates for the insufficient coverage of the fluorescent film at the edges by reflecting light from adjacent areas into the gap regions. The intermediary layer bridges the coverage gap without requiring the fluorescent film to extend beyond its manufacturing limits.
3Length of stationary object
If the backlight module thickness is reduced, then the light-mixing space is compressed, but this exacerbates the visibility of splicing gaps
Solution Approach 1:
The patent applies local quality by implementing the reflective layer specifically at the splicing gap locations rather than uniformly across the entire backlight module. This localized intervention addresses the gap visibility problem in thin modules without requiring increased thickness elsewhere. The reflective properties are concentrated where needed most, allowing the overall module to maintain its thin profile while effectively masking splicing gaps.
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 eliminates strip black lines and achieves uniform brightness by utilizing the optical film to reflect and refract light within the backlight module, improving luminescent efficiency and display quality.
Implementation Method 1
utilizing the optical film to reflect and refract light within the backlight module
Implementation Method 2
utilizing the optical film to reflect and refract light within the backlight module
Implementation Method 3
a plurality of fluorescent films disposed on the substrates and covering the light-emitting diodes
Data Source
AI summary
The disclosure provides a backlight module. Light reflected back and forth inside a display device is fully utilized, and luminescent efficiency of a luminescent device inside the display device is improved. In addition, the backlight module has a simple structure, which can solve technical problems of occurrence of strip black lines and uneven brightness that result from an application of a conventional backlight module in a large-scale display device by simply adding a refractive layer or a reflective layer.