3.5 Inch Touch Screen

3.5 inch touch screen is the more common size among small sizes.The structure is cover glass+sensor glass. But if you need more thinner thickness, we can also do cover glass+film+film structure. It adopts I2C interface, FT5436 touch solution with black silk printing. You are welcome to customize your own touch screen.

Product Features:

3.5 inch touch screen is equipped with 6H hardness chemically tempered glass.

What’s chemically toughened glass?

Chemically toughened glass is manufactured using a low-temperature ion exchange process. The so-called low-temperature system refers to the range where the exchange temperature is not higher than the glass transition temperature, which is relative to the temperature range above the transition temperature and below the softening point of the high-temperature ion exchange process. The simple principle of the low-temperature ion exchange process is to exchange ions with a smaller radius on the surface of the glass with ions with a larger radius in the solution in an alkali salt solution at about 400°C, such as lithium ions in the glass and potassium or sodium in the solution. Ion exchange, the sodium ions in the glass are exchanged with the potassium ions in the solution, and the difference in the volume of the alkali ions is used to form an intercalation stress on the surface of the glass. (The method is to immerse the silicate glass containing alkali metal ions in the molten lithium (Li+) salt to exchange the Na+ or K+ ions on the surface of the glass with Li+ ions, forming a Li+ ion exchange layer on the surface. The expansion coefficient of the glass is smaller than that of Na+ and K+ ions, so that the outer layer shrinks less and the inner layer shrinks more during the cooling process. When cooled to room temperature, the glass is also in a state of tension on the inner layer and pressure on the outer layer. The effect is similar to that of physical tempered glass.) The amount of large ions squeezed into the surface of the glass is proportional to the surface pressure, so the amount of ion exchange and the depth of the exchanged surface are the key indicators for enhancing the effect.

The stress distribution of ion-exchange tempered glass is different from that of physical tempered glass. The thickness of the compressive stress of the surface layer of the former is small, and the internal tensile stress balanced with it is not large. This is that the internal tensile stress layer of chemical tempered glass does not look like physical tempering when it is destroyed. The reason why the glass broke into small pieces like that. Because the ion exchange layer is relatively thin, the chemical tempered glass method has a significant effect on strengthening thin glass, and the strengthening effect on thick glass is not obvious. It is especially suitable for strengthening 2 to 4 mm thick glass.

What’s its advantage?

Chemically tempered glass is suitable for use in the following construction occasions: where there is a requirement to reduce its own weight, and at the same time, there are certain requirements for impact strength, bending strength and resistance to cold and heat shocks, such as windows and ceilings of agricultural greenhouses, doors and windows of mobile houses, etc.

The advantage of chemically tempered glass is that it has not been transformed into a high temperature process above the humidity, so there will be no warpage like physical tempered glass. The surface flatness is the same as that of the original glass. At the same time, the strength and temperature resistance are improved to a certain extent. It can be cut appropriately.

There are two main advantages of chemically toughened glass. The first is that the strength is several times higher than that of ordinary glass. The bending strength is 3 to 5 times that of ordinary glass, and the impact strength is 5 to 10 times that of ordinary glass. The strength is improved at the same time,which improves safety. Safety in use is the second major advantage of tempered glass. The increased load-bearing capacity improves the fragile nature. Even if the tempered glass is damaged, it will appear as small fragments without sharp angles, which greatly reduces the damage to the human body. When the glass is damaged by external force, the fragments will become small obtuse-angled particles similar to honeycombs, which are not easy to cause harm to the human body.

The resistance to rapid cooling and heating of chemically toughened glass is 2 to 3 times higher than that of ordinary glass. Generally, it can withstand temperature changes of more than 150LC, which has a significant effect on preventing thermal cracking.

Product Parameters:

Manufacturer Dingtouch
Product Name 3.5 inch Touch Screen
Part Number DT
Structure Cover glass+Sensor glass
Interface I2C
Silk printing color Black
Cover lens outline dimension 74x102mm
Cover lens Viewing dimension 49.56×74.06mm
Sensor outline dimension 54.80×82.98mm
Sensor Active area 50.96×75.44mm
Cover lens thickness 1.1mm
Sensor glass thickness 0.55mm
Total touch screen thickness 1.85mm
Controller FT5436
Touch points 5
Working voltage 2.8-3.3v
Light transmittance ≥85%
Hardness 6H
Working Temperature -20℃~ +70℃
Working Humidity 0% to 90%
Storage Temperature -20℃ ~ +80℃
Storage Humidity 0% to 90%
Without individual tolerance ± 0.2mm
Operating system Windows, Android, Linux OS
Warranty 12months
Business trade items EXW

Application and After-Sales Service:

Many smart home devices now use 3.5-inch touch screens. So what benefits will adding a 3.5-inch touch screen to the smart home control system bring us?


If we still use the traditional button switch in the newly bought house, it will appear that the house is relatively old-fashioned. But if you add a 3.5-inch touch screen intelligent control system, it will make your home look more intelligent. You can touch it all the time.

More convenient

We can control all the furniture in the whole house with just one touch. For example, the curtain can be automatically opened or closed with a light press. There is no need to follow a complicated APP program, all control programs can be manipulated on this.

Easy to manage

In the past, we might need to go to every room to control the equipment, but with the smart home control system, we can remotely control the temperature and humidity of any room. There is no need to run to every room to operate, so for lazy people like us, it is quite convenient.


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