Introduction to the process of LED backlight, what is LED flood light and backlight

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Fabrication of light guide plates.

If the light guide plate is only a plane, without the structure of the guide pillar and various retaining walls, and the thickness is more than 2mm, it can generally be made by cutting the acrylic plate, and then making it by silkscreen printing dots on it, and the cutting methods are mechanical cutting and laser cutting. In this way, the uniformity of light output can be adjusted relatively quickly, the second is to save the cost of injection molding, and the third is to quickly paste the optical film. The light source of this method is generally a plug lamp (2x3x4mm square lamp).

If there are positioning structures such as guide pillars and retaining walls on the light guide plate, the light guide plate needs to be produced by injection mold, the mold core is generally made of S136 steel, and the surface should be polished. The service life of a mold kernel is about 30 500,000 times. The optical mold matched with this kind of light guide plate is generally produced by die-cutting, and the production efficiency of the backlight is low, and the product repeatability is high.

Fabrication of optical molds.

Optical molds are generally made by die-cutting, and double-sided tape or self-adhesive adhesive will be prepared at the corresponding positioning position, and then arranged on the release paper for the film process. For the finer white light products, a release film without fiber peeling should be used, and it should be die-cut and produced in a thousand-level ultra-clean workshop. The brightening film used to improve brightness is protected with a protective film during die-cutting and use, and can only be removed when assembling the finished backlight.

It's not clear, most of them are backlights, which are equivalent to lamps.

In our information age with rapid economic and technological development, technology products have been thoroughly integrated into our lives occasionally, regardless of whether it is studying or missing work, or even entertainment, LED technology is almost with us. Even when we are free, some people like entertainment, some people like to surf the Internet, etc., which are inseparable from LED technology. So today, I mainly want to introduce you to a product of LED technology, that is, LED backlight.

Maybe many friends are still relatively unfamiliar when they hear it for the first time. So let's talk about what LED backlight is and what manufacturers are there.

What is LED Backlight?

LED backlight is also one of the products of LED technology, LED backlight is the light emitted through the high transmission light guide plate of the device, and then the emitted light is projected onto the panel of another device. According to different needs, different fluorescent lamp thicknesses can be made, and different light sources can be obtained. LED backlight technology has high requirements for the design of the overall system of the product, so LED backlight is also a scientific and technological product.

For example, products that are used daily, TVs, and products that require LED backlight devices.

Classification of LED backlights:

1. Edge light type. Edge light type is the most common type of LED backlight, edge light type LED backlight has the core light guide plate design technology, can directly design the product into bilateral type, or even three-sided type. Usually the edge-lit LED backlight has LED backlight and CCFL backlight, which is very common in small monochrome displays, such as **, flashlights, smart watches, etc.

2. Bottom backlight. The bottom backlight LED backlight can realize that the product has a continuous and uniform surface light source, and at the same time, it can be two or more power supplies synthesized into one, and the commonly used bottom backlight LED backlight has LED dot matrix and EL backlight, so in this kind of product, it is characterized by relatively thin and light weight, and the power consumption is also relatively low, which is suitable for watches, digital desktop clocks and other devices.

3. LED bottom backlight. LED backlight is the latest type of LED backlight, which has the advantages of good brightness, small size and long life. It is a product with great potential. At present, it is also used more and more, and its application prospects are wide.

It can be seen that the use of LED backlight is very extensive. But when we buy products, we ultimately need to choose according to the kind of effect we need. As the saying goes, it's not the best thing that's perfect, it's the best thing that suits you.

After reading the above information about LED backlight, I believe you must have a deeper understanding of LED backlight, and I hope the above content can help you. You can also stay tuned to Tuba Rabbit for more information.

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The former relies on the ability of dynamic partition backlight technology and the excellent light source of three-color RGB LED, which has a qualitative leap in color and contrast compared with traditional backlight, so it is usually used in high-end TV products, and the general cost is more than 3W yuan. The latter is a more common type of LED backlight, which is also widely used in notebooks and LCD monitors, and white LED backlights usually use light ingestion from the edge of the display, which is different from RGB LED and the direct back of traditional backlights.

According to the incident position of the backlight:

According to the incident position of the light source, the LED backlight module can be divided into two categories: direct type and side type, which can be roughly divided into direct RGB-LED, direct white LED, edge-light white LED, etc.

Difference Between RGB-LED and White LED::

RGB LED color gamut performance is slightly better, the disadvantage is that the cost is higher, and the price of finished TV products is still difficult to accept by ordinary consumers; The white LED light source, although slightly inferior to RGB LED in color gamut, but its relatively high contrast ratio and the cost of technology are incomparable to RGB-LED.

The difference between the straight down type and the side entry type:

The LED side light source emits light from both sides of the fuselage, and the light is projected onto the panel through the action of the built-in high light transmittance light guide plate. The biggest limitation on the thickness of the LCD is the thickness of the fluorescent lamp, and the side light source is located in the projection position on both sides, so that it does not occupy the space of the thickness of the TV.

Compared to the side light, the direct backlight LED can dynamically control the backlight, so that when representing the image of some dark scenes, only the necessary local light in the backlight area (which appears as black or darker parts on the screen) needs to be adjusted, and the high-quality image effect with natural chiaroscuro can be displayed.

Objectively speaking, various locations and light sources have their own technical advantages. Through different trade-offs, different product demands can be achieved. However, at present, LED LCD TVs are still in the introduction period, and the direct RGB LED has no good reflection in the cost of the whole machine.

The LCD (liquid crystal screen) itself cannot emit light, to be precise, it is shading. In order to display the restored image, it is necessary to use a background light source (referred to as backlight) to transmit the LCD screen, so as to obtain the image.

The early backlight was CCFL (Cold Cathode Fluorescent Lamp referred to as CCFL, Chinese translated as Cold Cathode Fluorescent Lamp). CCFL is mostly side-backlit, that is, the light source is installed on one or both sides of the LCD.