Backlight Module Side-Mounted Mini LEDs Narrow Bezel
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Solution Overview
Problem
Existing backlight modules for liquid crystal display technologies face challenges in achieving a narrow bezel and uniform brightness due to the large distance between LED chips, leading to hotspot phenomena and difficulties in realizing a thin form factor.
Innovation Solution
The proposed backlight module design includes a rear housing with a light guide plate and a light source where the light source is positioned between the side wall and the side surface of the light guide plate, allowing for a more compact arrangement. The light guide plate features a first light adjustment structure with concave surfaces to disperse light effectively, and the light source consists of a circuit board with mini LEDs arranged in rows to minimize spacing and enhance light mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the distance between LED chips is increased, then the manufacturing and assembly are easier, but the light distribution becomes uneven causing hotspot phenomena
Solution Approach 1:
A light guide plate with specifically designed light incident surfaces acts as an intermediary between the LED chips and the display panel. The light guide plate includes first light incident surfaces facing the LED chips and second light incident surfaces facing the display panel, which redirect and redistribute the light paths to achieve uniform brightness across the display area even when LED chips are spaced apart for ease of assembly
Solution Approach 2:
The patent optimizes the distance between adjacent LED chips to be between 0.5mm and 1.5mm, and positions the light-emitting surfaces of the LED chips within 0.1mm to 0.5mm from the first light incident surfaces of the light guide plate. These parameter optimizations ensure sufficient light mixing while maintaining assembly feasibility, resolving the contradiction between ease of manufacture and brightness uniformity
2Length of moving object
If the distance between the light guide plate and side wall is reduced, then the bezel width is narrowed, but the space for light source arrangement becomes limited
Solution Approach 1:
The patent transitions from traditional bottom-mounted LED arrangements to side-mounted LED arrangements on the light guide plate. The circuit board is positioned on the side of the light guide plate with light-emitting surfaces facing the first light incident surfaces. This dimensional change enables the light source to be arranged in the lateral direction, reducing the distance between the light guide plate and side wall to minimize bezel width while providing sufficient space for LED chip placement and light emission
3Illumination intensity
If mini light-emitting diodes are used, then the spacing between light sources is reduced improving light mixing, but the manufacturing precision requirements increase
Solution Approach 1:
The light guide plate is designed with self-aligning first light incident surfaces that automatically guide and position the mini LED chips during assembly. The specific geometric features of the light incident surfaces enable the mini LEDs to self-position within the optimal 0.1mm to 0.5mm distance from the light incident surfaces, achieving precise positioning without requiring extremely high manufacturing precision for each individual 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
This design reduces the distance between the light guide plate and the side wall, enabling a narrower bezel and improving screen-to-body ratio. The optimized light distribution and mini LED arrangement mitigate hotspot issues, resulting in enhanced display quality with improved brightness uniformity and a more compact form factor.
Implementation Method 1
the light incident surface has a first light adjustment structure, and the first light adjustment structure is configured to disperse light emitted by the plurality of light-emitting devices
Implementation Method 2
The light guide plate features a first light adjustment structure with concave surfaces to disperse light effectively
Data Source
AI summary
A backlight module includes a rear housing, a light guide plate and a light source. The rear housing includes a bottom wall and a side wall that are connected to each other; the bottom wall and the side wall enclose an accommodation cavity. The light guide plate is located in the accommodation cavity. The light source is located in the accommodation cavity and located between the side wall and a side surface of the light guide plate. The light source includes a circuit board and a plurality of light-emitting devices that are mounted on the circuit board. A surface of the circuit board away from the plurality of light-emitting devices faces the side wall, and light-emitting surfaces of the plurality of light-emitting devices face the side surface of the light guide plate.