How does touch screen technology work, i.e., what kind of sensors are used to do this, and how do they work?
There are many types of Touch technologies.Some of them are:ResistiveCapacitveinfraredSurface acoustic waveNear field imagingIn mobile phones, generally two types of Touch screens are used,Resistive or Capacitive,Reisitive: Resistive touchscreens (currently the most popular technology) work a bit like "transparent keyboards" overlaid on top of the screen. There's a flexible upper layer of conducting polyester plastic bonded to a rigid lower layer of conducting glass and separated by an insulating membrane. When you press on the screen, you force the polyester to touch the glass and complete a circuit—just like pressing the key on a keyboard. A chip inside the screen figures out the coordinates of the place you touched.Capacitive:These screens are made from multiple layers of glass. The inner layer conducts electricity and so does the outer layer, so effectively the screen behaves like two electrical conductors separated by an insulator—in other words, a capacitor. When you bring your finger up to the screen, you alter the electrical field by a certain amount that varies according to where your hand is. Capacitive screens can be touched in more than one place at once. Unlike most other types of touchscreen, they don't work if you touch them with a plastic stylus (because the plastic is an insulator and stops your hand from affecting the electric field).There are the most popular touch screen used but there are many technologies which are used in different places according to the need, you can view it here. How do touchscreens work?
What is an authentication problem in WiFi? How can I solve it?
First check your router screen. You may have, by mistake, added extra characters to your Wifi password on the router. Click the box for Wifi information on the router and delete those extra characters.. If the router screen password is found okay but still the authentication problem persists, then try changing security protocol (for example, if it's WPA - change it to WPA2) on the router. and try entering info manually, clicking forget and using "add network" option in the phone's WiFi settings.
Is it possible to set up a new wireless router without a computer?
If you have any form of interactive device such as a phone, a games console, a tablet, etc that you can connect to the router, then it should be possible. If all you have is a TV, or an Amazon Fire TV Stick then I doubt whether it can be done.Out of the box, a generic wireless router will normally have WiFi enabled, and the WiFi network name (SSID) and factory pass phrase will probably be on the router’s label. If the router has already been configured so that you cannot readily access it, then resetting the router back to the factory state is normally possible.Most routers can be configured from an Internet browser, so any device that can connect to the router and has some form of browser may be sufficient.It is normally easier to use a PC, and it is normally easier with an Ethernet connection rather than using a WiFi connection.Some ISP supplied routers come fully preconfigured and can simply be plugged in and will work. Generic ones may need certain settings configured so that will work with your ISP. The preconfigured routers should be alright if your only networked device is going to be a TV, but you probably cannot configure a settings on a generic router if your only device is a TV.If you have no suitable device, you should ask a friend if they can spare an hour with a laptop to get the router set up after which, providing you do not do a factory reset, you should be able to continue to use the router without any configuration device such as a computer being available.