Friday, 17 June 2011

HTC EVO 4G TOUCH SCREEN DETAILS AND SPECS

The product is perfect. Couldn't say more about it. This is a very manageable do-it-yourself project. However, some of you who are going to be looking at the YouTube videos need to be aware of a couple things.
                               
First off, the process that is shown in the YouTube video by the English accented guy is shown as being WAY too easy. This is because the screen in the video is intact. If you're like me, the reason that you bought this product is that you (or someone else) were an idiot and dropped your phone resulting in a spider webbed screen. Because of this, it's not just a matter of going around the edges of the glass with the safe pry tool. It's harder than that because you have all of the loose shards that are going to interfere with your safe pry too. When you get to them, stop and get a tweezers to lift them off of the tape.

Speaking of tape, it's the most important aspect of the repair. The glass fits over the LCD screen. There is a thin layer of adhesive tape that is similar to double-sided electrical tape that has been perfectly installed to go around the edges of the LCD screen. The video just says that it's adhesive, but that doesn't explain it well enough--it's tape. What you have to do is pry the top of the tape from bottom of the broken glass NOT the bottom of the tape from the top of the LCD. If you don't disturb that tape, you'll have a perfect install. It can be hard to get between the glass and the tape. You may need some hot air from a hair dryer. Try to start at a place with a good length of intact glass, close to the middle of the long edge of the phone. If you don't manage to get between the glass and the tape and some of the tape comes up, try to get it as close to where it was before. If you don't, you might have a piece of tape that blocks the LCD from coming through and that'll be annoying because you'll see it when you try to use the phone (i.e., the edges of the screen will not be straight).

We might have overreacted when using the word broken to refer to the Nexus One’s multitouch performance, but that post helped us learn the true culprit of the issue. When we took a closer look at HTC’s touch sensors used in their Android phones, we discovered they were using the Synaptics ClearPad 2000.

It turned out there was nothing wrong with the ClearPad sensor. It was working as advertised and was never meant to track the multiple touches that we were expecting. Google is likely to improve the multitouch performance with future software updates, but the Nexus One (and other HTC phones) will always be limited in what they can do with the Synaptics hardware.

HTC must have anticipated Google’s move to a more multitouch friendly Android because new reports suggest the handset maker has upgraded their touch sensors in two upcoming models. Various sources are now reporting that HTC is using the Atmel maXTouch family of touchscreen controllers in the upcoming Droid Incredible and EVO 4G.

The Atmel maXTouch sensors (mxt224) offer superior performance and low power consumption. These new sensors recognize an unlimited number of touches, offer faster response times, and have an excellent signal-to-noise ratio.
                                                      
Atmel has produced a quick promo video to demonstrate the power of their maXTouch series. A complete series of videos is available on the Atmel site for additional details.

Complete highlights of the single-chip touch solution include:

    Unlimited touches
    Low power consumption
    Fast response — completely redraws screen every 4/1000 of a second (4ms) to eliminate recalibration issues
    Excellent signal-to-noise ratio for superior precision — 3x better than competitive products
    Superior performance for first-touch response — 3x better than competitive products
    Unambiguous, unlimited touch support
    Responsive user interface: > 250 Hz report rate for a single touch
    Extremely low current consumption: < 1.8 mW in “touch-ready” state
    Two touch adjacency of less than 10 mm on a 4.3″ touchscreen
    Small footprint with few external components
    Supports stylus, fingernails, and gloves
    Grip and face suppression functionality: avoids false touches
    Size and angle of touch supported
    Screen sizes up to 10.2″ are supported by a single chip
    Proximity channel support

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