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LED backlight design needs to meet the requirements

2019-12-13

What are the requirements for LED backlight design? I believe many of my friends don't know much about it. Let's take a look at it in detail.

(1) Meeting customer requirements for basic structure and performance of products


1. Basic structure of the product: Refers to the structure of the structure and the structure that affects the assembly of the customer module.


Since the basic structure of the product is related to the customer module, it can not be changed at will, except that the customer module has not been designed, and only after the backlight is out.


2, performance includes: LED brightness, uniformity, storage temperature, operating temperature, input current and voltage and other test conditions and optical requirements.

2.1 The input current and voltage are determined by the guest module, so the IF and Vf values should be clearly understood during design to handle the brightness.

2.2 Brightness refers to the intensity of light per unit of illumination area.


(2) Structural analysis

1. Structural design: The geometric shape should be as good as possible to ensure the principle of forming and avoid the complexity of the mold.

1.1 For example, if the product can be designed to walk the insert, do not design it as a slider. Moreover, the product made by the slider on the mold will have weld lines, which will affect the aesthetics of the product. If it is a light guide plate, it will affect the brightness.


1.2 The hole of the insert is generally 1.0mm or more, so as to prevent the sheet from being interrupted during the sliding process.


2. Thermosetting plastic materials.

The thinnest wall thickness:  1.5~2.5mm.


Thermoplastic materials: The materials used for the backlight are all such materials.


The thinnest wall thickness:  0.25mm, but due to the constraints of injection molding, the product wall thickness is at least 0.4mm.


3, ribs: in order to avoid stress deformation, without affecting the product assembly, you can add reinforced ribs


4, support surface: in order to avoid abrasion on the biting surface when rubbing as much as possible without the entire plane support.


5, rounded corners: without affecting the assembly, can be appropriately rounded to facilitate demolding.

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