LED Lens Fixation on Backlight Substrate for Uniform Illumination
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Solution Overview
Problem
In liquid crystal display devices with concentrated light emitting diodes, the stability of lens fixation is compromised due to varying bonding layer thickness, leading to potential brightness unevenness and impaired heat dissipation.
Innovation Solution
The lenses are fixed directly above the electrodes on the light emitting diode substrate with all legs disposed symmetrically or asymmetrically, ensuring uniform bonding layer thickness and stable fixation without reducing heat dissipation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting diodes are disposed across the entire region of the backlight unit, then the light distribution is uniform, but the substrate size and material cost increase significantly
Solution Approach 1:
The patent segments the backlight unit into two functional regions: a concentrated light emitting diode array region and a light diffusion region. The light emitting diodes are disposed only in a specific region rather than across the entire backlight unit, reducing substrate area while maintaining effective illumination through the diffusion function of the light guide plate
Solution Approach 2:
The patent transitions from a two-dimensional uniform distribution of light emitting diodes across the substrate to a concentrated arrangement in a specific region, utilizing the third dimension (light diffusion through the light guide plate thickness) to achieve uniform illumination across the entire backlight unit area
2Object-affected harmful factors
If the lens is elevated from the substrate to avoid contact with the light emitting diode element, then the light emitting diode element is protected, but the fixation stability decreases due to varying bonding layer thickness
Solution Approach 1:
The patent introduces asymmetric support structures (legs or protrusions) on the light guide plate that create a controlled, consistent gap between the lens and the light emitting diode element. This asymmetric design provides stable fixation points while maintaining the necessary elevation to prevent contact with the light emitting diode element
Solution Approach 2:
The patent introduces an intermediary structure (the light guide plate with integrated support legs or protrusions) that mediates between the lens and the light emitting diode element. This intermediary provides both the elevation needed to protect the light emitting diode element and the stable fixation points needed for reliable lens mounting
3Temperature
If the electrode area is increased to dissipate heat efficiently, then the heat dissipation performance improves, but the available area for lens fixation is reduced
Solution Approach 1:
The patent segments the light guide plate into distinct functional zones: large-area electrode regions for heat dissipation and localized support structure regions (legs or protrusions) for lens fixation. This segmentation allows both large electrode area for thermal management and sufficient support structures for mechanical fixation
Solution Approach 2:
The patent applies local quality by concentrating the fixation support structures at specific locations on the light guide plate rather than distributing them uniformly. This allows the majority of the light guide plate area to be dedicated to heat-dissipating electrodes while providing localized support points for lens fixation
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 approach stabilizes lens fixation while maintaining effective heat dissipation, preventing brightness unevenness and enhancing the reliability of the liquid crystal display device.
Implementation Method 1
a plurality of light emitting diode elements 22; lenses 20... disposed above the light emitting diode element 22
Implementation Method 2
In order to diffuse light from the light emitting diode, a lens for diffusing light beams needs to be provided in front of a light emitting diode element
Implementation Method 3
The legs 21a, 21b, and 21c are each fixed to the light emitting diode substrate by bonding
Implementation Method 4
electrodes 23... formed on the substrate so as to connect anodes and cathodes of the light emitting diodes in series
Implementation Method 5
The electrode is formed so as to have as large area as possible in order to efficiently dissipate heat generated by the light emitting diode element
Data Source
AI summary
In order to fix lenses of light emitting diodes stably without impairing heat dissipation performance in a liquid crystal display device, the liquid crystal display device includes: a liquid crystal panel; and a light emitting diode substrate (7), which is disposed on a rear surface side of the liquid crystal panel and includes: a plurality of light emitting diode elements (22) disposed along a longitudinal direction; lenses (20) each including a plurality of legs (21), the lenses being disposed on the liquid crystal panel side of the light emitting diode elements (22); and electrodes (23) which are formed on a surface of the light emitting diode substrate (7) and are electrically connected to the light emitting diode elements (22), and all the legs (21) for fixing the lenses (20) to the light emitting diode substrate (7) are disposed directly above the electrodes (23).