Backlight Module LED Coupling Light Mixing
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Solution Overview
Problem
Current backlight modules for large and medium-sized mini LEDs suffer from poor light mixing due to smaller coupling distances, leading to uneven light distribution and the appearance of dark lines.
Innovation Solution
A backlight module design featuring a back plate with a receiving cavity, LED strips, a diffusion plate, and an optical film, where the distance between the diffusion plate and LED lamps is less than a default value, and the LED lamps at the coupling position have an illuminating inner diameter greater than the edge length, optimizing illumination angles and distances for improved light mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple coupling methods are used to achieve larger sizes, then the backlight module size is increased, but the coupling distance becomes smaller causing light mixing to be uneven and dark lines to appear
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of LED lamps in different regions. Specifically, the coupling area contains LED lamps with larger illuminating inner diameters and greater illumination angles, while other areas use standard LED lamps. This localized optimization ensures adequate light mixing in the critical coupling region without compromising overall module size.
Solution Approach 2:
The patent changes key parameters of LED lamps in the coupling area, specifically increasing the illuminating inner diameter and illumination angle compared to standard LED lamps. These parameter modifications enable sufficient light diffusion and mixing in the coupling region, preventing dark lines while maintaining the reduced coupling distance for large module sizes.
2Length of stationary object
If the coupling distance is reduced, then the backlight module can be made larger, but the light mixing effect deteriorates
Solution Approach 1:
The patent implements local quality by positioning LED lamps with enhanced characteristics (larger illuminating inner diameter and illumination angle) specifically in the coupling area. This localized enhancement compensates for the reduced coupling distance, ensuring adequate light mixing occurs even when the overall module size is increased through smaller coupling distances.
Solution Approach 2:
The patent applies asymmetry by creating non-uniform distribution of LED lamp characteristics across the module. The coupling area features LED lamps with larger illuminating inner diameters and greater illumination angles, while other areas use standard specifications. This asymmetric design optimizes light mixing precisely where needed without compromising the benefits of reduced coupling distance.
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
This design enhances light mixing efficiency and reduces dark lines by increasing the illumination angle and density of LED lamps, resulting in better light distribution and uniformity, even at reduced light mixing distances.
Implementation Method 1
a diffusion plate arranged in the receiving cavity and disposed in a light emitting direction of the LED strip
Implementation Method 2
the light source comprises at least two LED strips coupled to the back plate, the LED strips comprise a plurality of first LED lamps and a plurality of second LED lamps
Data Source
AI summary
The present invention provides a backlight module. The backlight module includes a light source, an optical film, a diffusion plate, a back plate, and LED strips disposed on the back plate. The back plate forms a receiving cavity and includes at least two coupled LED strips. The light source, the diffusion plate, and the optical film are arranged in the receiving cavity. Wherein, LED lamps which are at an end of the LED strips and adjacent to a coupling position have an illuminating inner diameter on the diffusion plate, and the illuminating inner diameter is greater than an edge length to the coupling position, which improves technical problems of poor backlight mixing in backlight modules.