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8 Points We Must Confirm before We Quote a Custom LED Backlight

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LED backlight can not only be used as the light source for LCD panels, but can also be used as an illumination equipment, like LED panel lights, LED ceiling lights and LED light boxes. There is no essential distinction among these lights which are edge LED backlights. The only difference among them is the size.

Some people may think the structure of an LED backlight is much simpler than the structure of liquid crystal display, so it is very easy for us to quote a custom LED backlight. I am sorry to tell you that this is not true. At least in my own experience, it is not the case. In my opinion, LCD screen is a 50% custom and 50% standard product. LED tube light is a 100% standard product, but LED backlight is a 100% custom product.

You can request any length, width and thickness of LED backlight and install a random quantity of LED lamps into an LED backlight, as long as you can pay for the cost.

Here is a summary of the necessary information that we need before we can offer quotes:

1.What are you looking for?

Edge LED backlight or Bottom LED backlight? You can see my post The Comparison Of Bottom LED Backlight And Edge LED Backlight. You don’t have to choose between an edge LED light or a bottom LED backlight. We can make the design for you according to your requirements.

2.Quantity.

The more you order each time, the cheaper the unit price will be.

3.LED lamps.

There are two main kinds of LED lamps: DIP LED and SMD LED, which we can use in the LED backlight. High power LED is one of the main LEDs which are used in LED spotlights. I would be very grateful if you don’t have special requirements about the color temperature of LED lamps. You can see my post: Color Temperature.

Unfortunately, we can customihttps://displaybly.com/what-is-color-temperature/ze the color temperature only when the order quantity is more than 50,000 pieces.

Our factory has one production line for DIP LED and one production line for SMD LED. We can make any custom color temperature of LED lamps, but the minimum quantity for LED Lamps is 50,000 pieces.

4.The thickness.

This is the most important factor in the design of the LED backlight. I have been asked this question many times: “How thin can you make a LED backlight?” To answer this question, let us see the basic structure of LED backlight: reflection film,  light guide plate, diffusion film.

The thickness of reflection film is 0.1 mm and the diffusion film is 0.1 mm. The light guide plate is complicated. The thickness of a standard light guide plate could be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 5.0 mm. We can make a dedicated light guide plate as thin as 0.45 mm. You can see my post: what is light guide plate

Therefore, the total thickness of edge LED backlight is 0.9 mm (0.1 mm reflection film, 0.6 mm light guide plate, 0.1 mm diffusion film and 0.1 mm double-faced adhesive tape which holds all the parts together)

It is a lot easier for production if we use DIP LED because we don’t need to install PCB or FPC on the DIP LED. The minimum thickness of light guide plate to install the DIP LED is 2.0 mm.

5.PCB or FPC

If the thickness of the light guide plate is less than 2.0 mm, we have to use SMD LEDs which are installed in the PCB or FPC. If you have special requirements about PCB or FPC, we have to make a dedicated PCB or FPC. For example:

One, put the hard PIN or wire at the two ends of the edge of the PCB.

Two, 3.0 v is our most widely used voltage for LED backlights. If the driving voltage you require is 6.0 v, 9.0 v or 12.0 v, a dedicated PCB will be needed.

Three, the total thickness of LED backlight is 0.9 mm and the light guide plate is 0.6 mm. The PCB is too thick to be installed in the light guide plate. Only dedicated FPC can meet the requirement in this situation. But the dedicated FPC is much more expensive than the dedicated PCB.

6. The connection of LED lamps.

You can see my post: The comparison of LED Serial Connection and LED Parallel Connection

Parallel connection is the most widely used connection.

7. Exterior area and active area.

I am always hearing people talk about size, but they fail to mention if it is the exterior area or the active area.

Let us look at this example.

This is an exterior area 30.0 x 30.0 mm and 1.9 mm thick LED backlight. The active area is 25.0 x 30.0 mm.

The thickness is only 1.9 mm, we can infer that:-

One, light guide plate is 1.5 mm.

Two, SMD LED is used as the light source because the DIP SMD requires at least 2.0 mm light guide plate.

Three, light shade area is 4.0 x 30 mm.

I want to replenish some basic knowledge about light shade area. If we use DIP LED as the light source, the width of the light shade area should be 5mm-7mm; meanwhile, if we use SMD LED as light source, the width of light shade area should be 3-5 mm.

8. The connection of the LED backlight

There are wire harness connection, PCB with hard PIN connection, PCB without hard PIN, FPC connection, mental PIN connection and wire (lead) connection for LED backlight. The most widely used connection is wire (lead) and metal pin.

The more special the LED backlight you require, the more expensive it will be. LED backlight with the same exterior size can have a huge difference in the unit price. Assuming one with the regular light guide plate and wire connection and another with dedicated light guide plate and dedicated FPC. We can conclude that we can practically satisfy your any special requirements for LED backlight as long as you can afford the price.

Therefore, please review these 8 points before you request for a LED backlight quote. It will be a lot easier for us to get you an accurate quotation.

greg

greg

Hi, I'm Greg, sales manager of displaybly.com. I've been working in the display & touch industry for more than 10 years, and the purpose of this article is to share the knowledge from a Chinese supplier's perspective.
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