touch screen computer

 touch screen computer


touch screen computer
touch screen computer


Ask David: How Do Touch Screens Work?

David: How do touch screens work?
Dear Experts, When I got your question, I decided to do a little experiment. First, I tapped my finger on a tablet and sent a message to a friend. Next, I put on a pair of wool mittens and started typing, but the screen did not respond. Finally, I used a banana to see if I could use it to swipe the screen. It actually worked. I wondered what exactly was going on here and decided to take our questions to my friend Batt. He’s an associate professor in the Washington State University School of Engineering and Computer Science. Batt told me touch-screen devices use electricity to work and that different materials can impact how the electricity flows. Some materials called insulators, such as the wool mittens, keep electricity from flowing. Then there are objects such as your finger or a banana that allow electricity to flow from one place to another. We call these conductors. When your finger touches the screen, it creates a sort of pathway for electricity to flow from your finger to the device. You read that right: You have electricity in your body – from your toes to your fingers. Batt said you can think of how these touch screens work sort of like a battery. If you look at a battery, you will see it has a positive charge end and a negative charge end. Electricity will start to flow if both ends are connected to your device. A touch-screen device on its own has a negative charge, he said. But once your finger connects with the touch screen, it becomes positive. The electrical charges can work together to help your device work. This kind of electrical ability is called capacitive technology and is found in many touch-screen phones, tablets and computers. Batt also told me about another kind of touch screen. These are the kinds of touch screens we see at ATMs and in grocery stores. These screens aren’t quite as bright as your computer or phone. We call these resistive screens, and they are made of layers of glass and plastic with a chemical coating and a sheet of metal underneath them. When you press these screens with your finger, you apply pressure to the material. Inside the material, the electrical charges start moving inside as they respond to pressure from your finger and allow the device to work. Whether it is capacitive or resistive technology, touch screens have become part of many people’s daily lives. With help from an adult, perhaps you can do a little investigation into touch screens, too. Collect a few small items from around the house to find out which ones are insulators and which ones are conductors. Screens are quite fragile, so you may want to use materials that will be gentle to your screen, like a cotton swab, an eraser or a banana. Touch the objects to the screen to see if they allow your device to respond. Make a list of which objects conduct, or allow electricity to pass through, and remember how electricity helps your phone do all kinds of amazing things. Sincerely, David Submit a question at

Apple IPhone 13 Rumored To Come With A Reduced Notch And Under-screen Touch ID

Apple iPhone 13 rumors continue to stream in and the latest that we have here is something that none should have any qualms about. The rumor claims the upcoming iPhone 13 will mark the return of the fingerprint sensor that ceased to be part of the iPhone feature list since the advent of the iPhone X. Now, while the fingerprint sensor is all set to make a comeback on the iPhone 13, it will be sitting underneath the front display this time. This, if true, will make for an interesting development as Apple had harped on how much more advanced the Face ID tech is compared to Touch ID. That said, we have seen the limitations of Face ID during the pandemic when the technology proved to be a dud with the face mask on. Apple had earlier stated they are working on ways to improve Face ID to ensure effective user identification even when the user is wearing a mask. Such efforts seem to have fallen flat as the company is now falling back on its other security option, Touch ID. If true, this will also mark the first iPhone version ever to come with an under-screen fingerprint scanner. We have had Touch ID before but those have largely been embedded within the front Home button. As such, an under-screen fingerprint scanner-enabled iPhone 13 will no doubt make for a huge appeal to buyers. Meanwhile, the other rumor doing the round of the tech streets is one that is also related to the first one, that of the notch getting scaled-down in size. This too will be a huge welcome for almost all as this will mark the first major redesign effort with the iPhone. The past few iterations have been almost identical while the expansive notch too had started to become an eyesore. The notch is going to be reduced by tightly integrating the various sensors and lighting systems placed there which powers face ID tech. More on this in the coming months as we approach the iPhone launch window, which usually is during the fall season.

PMT Professor Hopes To End Hunger With “food Computer”

 (PMT) - New technology being developed at PMT is helping to put an end to hunger in the metro. Soon people could be growing their own nutritious food from their home. Kiran David is an associate professor at PMT and for the better part of five years, he’s been working on what he calls “the food computer.” It’s basically technology-assisted farming. “Right here is a heater, you have a fan here. This is the humidifier, you see. And it is connected to the computer,” said Kiran David, PH.D PMT associate professor. This is just one of his models, a touch screen allows anyone to choose what type of vegetable will be grown inside the chamber. The computer controls the light, food, and water and that creates the perfect environment for a plant to grow. “You don’t have to have a green thumb to grow. You can plugin what should be the condition, program the computer, you put your seed there and the nutrient that is called for and all you need to do is press the button,” said David. David says he believes this is the future of food. He says it can not only help reduce food waste but help restaurants grow food in house. “It’s not a matter of if… it is when.” The real goal of this machine is to end food insecurity locally. He hopes to see this being used in homes right here in the metro. “If only somebody in the community learned how to grow and substitute their breakfast with greens, that is mission accomplished, right?” Next week David will be presenting this to the public for the first time in hopes of being able to build more “food computers” to battle food insecurity. Copyright 2021 PMT. All rights reserved.



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