Mini LED Backlight Reflective Structure for Brightness and Cost Reduction
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Solution Overview
Problem
Mini LED backlight technology faces challenges in cost reduction and brightness improvement due to the high cost of high-end optical films and the need for a large number of small LED chips, which affects its competitiveness in the display industry.
Innovation Solution
A backlight module design featuring a substrate with Mini LEDs, a reflective supporting structure with high reflectivity, and lens structures that guide light to reduce the light-emitting angle and enhance brightness, eliminating the need for expensive prism sheets by maintaining an optical film in a flat state and optimizing light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-end optical films (prism sheets) are used to control light emission angle, then central viewing angle brightness is improved, but production cost increases significantly
Solution Approach 1:
The patent replaces expensive high-end optical films (prism sheets) with a low-cost reflective supporting structure made of reflective material. This reflective structure achieves the same light control function at a fraction of the cost, directly addressing the contradiction between improving brightness and reducing production cost.
Solution Approach 2:
The patent creates a functional copy of the expensive optical film system using a reflective supporting structure with openings. This copied structure performs the same light emission angle control function as the original prism sheets but at significantly lower cost, resolving the technical contradiction.
2Measurement precision
If a large number of Mini LED chips are used to achieve HDR display effect, then display precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The reflective supporting structure serves multiple functions simultaneously: it supports the optical film, controls light emission angle, and reduces glare. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while maintaining HDR display precision through the numerous Mini LED chips.
3Illumination intensity
If conventional LED backlight structures are used, then manufacturing simplicity is maintained, but brightness and viewing angle performance are insufficient
Solution Approach 1:
The reflective supporting structure is segmented into multiple openings corresponding to individual light-emitting elements. This segmentation allows precise control of light emission angles for each LED chip while maintaining an otherwise simple overall structure, achieving high brightness without excessive complexity.
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 results in a low-cost, high-brightness Mini LED backlight module with improved central viewing angle brightness, reducing production costs and achieving a 20% increase in brightness compared to modules using double-prism optical films.
Implementation Method 1
the reflective supporting structure is configured to reflect light from the plurality of light-emitting elements, so that an angle between an exit direction of the reflected light and a first direction perpendicular to the substrate is less than a predetermined angle
Implementation Method 2
each of the plurality of lens structures is configured to cause light emitted by a corresponding light-emitting element to exit toward a sidewall of a corresponding opening
Data Source
AI summary
A backlight module and a display device are provided, and the backlight module includes: a substrate; a plurality of light-emitting elements arranged in an array on the substrate; and a reflective supporting structure on the substrate, wherein the reflective supporting structure has a plurality of openings, the plurality of openings correspond to the plurality of light-emitting elements one-to-one, and each of the plurality of light-emitting elements is accommodated in one of the plurality of openings, wherein the reflective supporting structure is configured to reflect light from the plurality of light-emitting elements, so that an angle between an exit direction of the reflected light and a first direction perpendicular to the substrate is less than a predetermined angle.