Mobile is not what we use. And now in the age of smartphones, touch screens should not work without mobile. I am regularly calling or texting someone else with a touchscreen mobile. But have you ever wondered, how does this touch screen actually work?
How does the mobile touch screen work?
Although the mobile was invented long ago, the first invention of the touch screen mobile was in 1992. This brings a different twist to mobile. Basically, the touch screen is the display screen. Which also acts as a touch screen. This screen is sensitive, which acts as a kind of input device. It works by pressing on it with fingerprints, nails, or any stick.
Currently, two touch screens called resistive and capacitive are used more. Among these, the capacitive touch screen is being used in mobiles. Such a touch screen is totally dependent on the electrical impulses of the human body. This touch screen would not work if our body did not have an electric charge.
If you want to know how the touch screen works, you must first know about the screen of the mobile. The upper part of the mobile screen is the touch detection part and it is the LCD screen. It is basically the upper part of the battery and circuit of the mobile. Mobile screens have two layered screens. The inner circuit of the mobile is connected to a bunch of thin wires through these two screens. Through this, the circuit activates the screen of the mobile. The glass on the top of the mobile phone actually protects the mobile phone from various types of injuries. The glass or screen below it is connected to the inner wires. There are basically two wire layers. These two combine to form a grid pattern. The two carry opposite charges to each other all the time.
When the finger of our hand touches the mobile screen, the charge is exchanged between the layers. The fingers of the hand act as a third means of exchanging charges to maintain the balance of charges.
When touched on the screen, the finger is inserted into an electric field. The blood and cells of the finger are full of water. The charged atoms are dissolved in it. Such as positive ions sodium and potassium and negative ions chloride. When the finger is inserted into the electric field, this field continues to prepare the charges and the negative ions come towards the positive wire and the positive ions move away.
All additional charges are organized in the finger. Since the electric field is very strong, it can absorb a lot of charge from the battery. The charge of the finger goes very close to the electric field, it is visible to the phone and the touch screen works accordingly.
The black spots around the touch screen cover the sensor. Hidden sensors measure exactly how much electricity flows.
Another question remains, how does the mobile phone work according to the pressure applied to a particular place on the screen? How do you know when I'm calling or not? The answer is that these things are already programmed into the operating system of the device. When designing a new operating system the processor is given instructions on these issues.
Author: Student, Dhaka University
Source: ComputerWorld.com
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