how to glue lcd screen supplier

This is the only option and is available in many sizes. The glass touchscreen on majority of phones/tablets do not come in direct contact with the actual LCD, it is connected via ribbon connector.

For Samsung phones you have to use a UV activated liquid adhesive but it must dry crystal clear and you do need to purchase a UV light to activate the glue.

I have no idea what type of adhesive Apple products use but I am sure it would cost a lot and you probably will need a vacuum type screen seperator machine.

If your device is cost effective to repair, you are familiar with delicate electronics and have patience then I would try it but you have to purchase screen repair tools from someplace such as eBay that sells these sets for cheap.

LOCA or Liquid Optically Clear Adhesive is kind of special UV glue or sealant used to bond display / LCD Screen and touch screen panels. It is also called UV Glue. Most technicians prefer to use LOCA Glue or UV Glue over other glue or sealants because it improves contrast by many times. It also prevents loss of light from the display and hence increases the life of Mobile Phone Battery.

In order to replace a faulty, broken or damaged glass / touch panel (PDA) of LCD Screen of a mobile phone or smartphone, you will need following Mobile Phone Repairing Tools:

Separating the glass from the LCD should be done very carefully to avoid any unwanted damage. Special care must be undertaken if the glass is cracked. Never try to take off the glass without the right tools and equipment. It can damage the LCD which can be very costly to replace.

The glass and LCD are strongly bonded together with LOCA glue. The glue must be heated to loosen the bond. It can be done using a Hot Air Gun / Heat Gun. Technicians with some practice can easily do it. However, in most authorized service centers and professional service centers, they use LCD separator machine.

Use a Hot Air Gun or LCD Separator Machine, to give heat to the LCD to Loosen the bond of the LOCA glue. In both cases, a temperature of 200-300 Degree C is OK.

Gradually and evenly heat the front side of the phone. Use the Infrared Thermometer to check the temperature before trying to remove the glass. Make sure there is neither too much heat nor too little heat. Too much heat will burn the LCD screen while too little heat might crack it.

Start removing the glass from the top of the screen where speaker is located. Use the metal spudger to carefully separate the glass from the LCD screen. Move the spudger along the top edge and make enough space for the putty knife to slip in.

Reheat the surface and using the putty knife, carefully pry the glass away. After removing the Glass, use the Goof Off  or Hot Blade to remove existing melted LOCA glue and clean the LCD screen using lint-free wipes. Some service centers and technicians also use automated LOCA removing machine.

LOCA glue is available in the form of liquid. It is not as thick as other adhesives. Apply just enough glue on to the screen in a “X” pattern with a “-” in the middle of “X”. Make sure not to apply too much or too little glue and see that there is no air bubble.

The adhesive will gradually spread across the screen and to the edges on its own without you having to apply any pressure. If there is any bubble, apply gentle pressure on the LCD and guide the bubble to the edge.

LOCA Glue do not cure or dry on its own. You have to dry it using UV light. Always Use a branded UV light that is about 30 to 40 Watts. You can also use a UV nail dryer. But do not use Flashlight UV lights.

Curing or Drying time of the Glue is generally 1 to 2 minutes. It also depends on the Wattage of the UV light source and the distance between the UV light source and the LCD Screen or Glass.

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LOCA adhesives are generally two-component chemically-cure materials. Early iterations were designed with a focus mainly on adhesion and protection properties and were often subjected to a lack of clarity and development of haze under certain conditions. To combat this situation, many suppliers were forced to add additional active ingredients to deal with excess reactants, or masking agents to absorb or mask hazing agents. This approach was at times expensive, inefficient, and inconsistent in the control of clarity and haze issues.

In this situation, if the LOCA adhesive is inadequately cured, any subsequent ingress of humidity and/or moisture can lead to side reactions and the formation of haze.

If the LOCA adhesive is not fully tested for compatibility with any edge sealing chemistries, it is not uncommon to result in the formation of a hazy appearance especially near the edges of the display.

LOCA adhesives must be carefully designed and all reactants balanced exactly to avoid the existence of excess remaining reactants. If not properly balanced, these remaining materials can react over time and form unwanted haze.

For each of the above-mentioned causes for haze in LOCA display assemblies, it is possible to make use of solutions or proper behaviors that can minimize or eliminate them.

In order to avoid moisture reactions with inadequately cured LOCAs, the obvious solution is to make certain of adequate LOCA cures. This can be accomplished by careful adherence to energy and requirements for the individual adhesive in question. HumiSeal polymer chemists and process engineering teams are experienced in customizing LOCA products that are suitable for a wide range of manufacturing equipment, which can help to minimize the risk of curing inadequacies. It is also important to regularly measure and adjust UV equipment in manufacturing situations as it does not remain static and will tend to drift lower over time.

LOCA screen adhesives are generally paired with matching edge bonding adhesives. The selections of these two materials cannot be done independently or in a vacuum but must be treated as a “system” solution. HumiSeal, as an example, designs both LOCA screen and edge bonding materials as systems that are compatible and are based on the same LOCA chemistries to avoid undesired interactions. It is also critical that the index of refraction of these two materials be properly matched.

As mentioned above, a correct and exact balance of all reactants is critical to avoid the formation of haze due to further reactions. As a result, the solution is to work closely with LOCA chemists and be certain that there are both the right type and exact amounts within very tight tolerance of all functional ingredients.

The polymer chemists at HumiSeal are experts in collaborating with LCD assemblers, providing custom or individualized solutions as required. We offer a complete solution through our outstanding manufacturing and technical support, resulting in the reliable global supply and unmatched quality required in the ever-evolving display assembly industry.

This article was co-authored by Linh Le and by wikiHow staff writer, Nicole Levine, MFA. Linh Le is a Certified Mobile Repair Specialist and the Owner of SC Mobile Repairs in San Clemente, California. With more than 12 years of experience, he specializes in smartphone, tablet, and smartwatch hardware repair. Linh has an iTech Mobile Device Repair Certification and an iOS Certification. He holds a Bachelor’s degree from The Franciscan University of Steubenville.

I"m talking about an LCD like what is shown in the picture below. Can hot glue applied to its borders damage the liquid crystal molecules or anything else inside it?

Typically, standard LCD character and graphics modules provide a temperature range of 0°C to +50°C. However, several display manufacturers offer extreme temperature models with operating temperatures of -40°C to +80 or +85°C. There also is a wide selection of standard versions that range from -20°C to +70°C

If this is true, it may not be safe to use hot glue for this purpose. However, since hot glue is applied for less than one minute to a small fraction of the area I"m not sure.

I need to replace my cracked digitizer/glass on my OnePlus One and it seems changing only the digitizer is kinda hard so next thing is to get the full LCD to replace.

It seems logical that lcd + frame is easier but it seems it requires to move components/motherboard around which for me seems more prone to mistakes and problems then just buying an LCD and putting it into my old frame.

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