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#1
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Touchscreens
I have recently tried a touchscreen on my navpod using it as a repeater for
my laptop for navigational purposes. Unfortunately it was a bit of a disaster. Problems with steaming up, and poor brilliance and a lot of reflections. It was fine at night or on a dull day, but who wants to sail when its just about to p..s down with rain. Does anyone have any experience of installing transreflective touch screens, can you suggest suppliers (UK) and possible pitfalls Thanks for any help |
#2
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Phil,
I've never heard of a transflective touchscreen. A transflector needs to be mounted on the rear of the displar, not on the front. In the reflective mode they allow light that has passed through the to be reflected back out. In the transmissive mode they allow light from a back light to pass through the transflector. If you mounted it on the front it would probably make the display harder to read, due to light losses. It would also probably have lots of glare problems as well. Most manufacturers overcome the poor performance in bright lighting by having a very bright back light on all the time, they dim it for night usage. John |
#3
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Capt John wrote:
Phil, I've never heard of a transflective touchscreen. A transflector needs to be mounted on the rear of the displar, not on the front. In the reflective mode they allow light that has passed through the to be reflected back out. In the transmissive mode they allow light from a back light to pass through the transflector. If you mounted it on the front it would probably make the display harder to read, due to light losses. It would also probably have lots of glare problems as well. Most manufacturers overcome the poor performance in bright lighting by having a very bright back light on all the time, they dim it for night usage. John John, How about almost _every_ PDA out there? They are all touchscreen as you will realize, and since the battery cannot afford really bright backlights they make them reflective. You're right in that the reflector needs to be on the back, but this doesn't prevent the manufacturer from fitting a touchscreen on the front. -- Kees |
#4
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Kees,
A transflector is a transmissive reflector that is mounted on the back of an LCD and it can work in two modes. In the reflective mode light that passes through the front of the LCD is reflected back out, allowing you to read the display. In the transmissive mode it allows light from a back light, mounted behind the LCD, to pass through it and out the LCD, so you can read the display. If the transflector did not allow light to pass through it from the back side you would not be able to use a back light, as the light would never be able to pass through it and out the LCD. Every PDA uses a transflector like this, and most have a back light that can be turned on in low light applications. A touch screen is mounted on the front of the display. It's only function is for the inputting of data. It must be optically clear so as to not distort, or dim, the image passing through it from behind. John |
#5
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Capt John wrote:
Kees, A transflector is a transmissive reflector that is mounted on the back of an LCD and it can work in two modes. In the reflective mode light that passes through the front of the LCD is reflected back out, allowing you to read the display. In the transmissive mode it allows light from a back light, mounted behind the LCD, to pass through it and out the LCD, so you can read the display. If the transflector did not allow light to pass through it from the back side you would not be able to use a back light, as the light would never be able to pass through it and out the LCD. Every PDA uses a transflector like this, and most have a back light that can be turned on in low light applications. Thanks for the great explanation on something that has had me confused for a while. I have a Palm Tungsten T3 that has a backlight. It works very well indoors. As soon as I take it outside it into daylight it darkens up and becomes pretty much useless. With direct sunlight, you can't even tell that it is turned on. That must be a different kind of display. What is that called? I am told that it does not have a light sensor that turns off the backlight in daylight. It is a brilliant, sharp, display but disappointing for daylight use. Jack -- Jack Erbes in Ellsworth, Maine, USA - jackerbes at adelphia dot net (also receiving email at jacker at midmaine.com) |
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