Author Topic: EEVblog #1346 - How An Infrared Optical Touch Screen Works  (Read 1154 times)

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Offline EEVblog

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EEVblog #1346 - How An Infrared Optical Touch Screen Works
« on: November 08, 2020, 09:35:19 am »
Dave tears down and investigates a Dell infrared IR optical touch screen monitor found in the dumpster.
Infrared touch screen are not often used in consumer computer monitor applications compared to resistive and capacitive touch screen technologies.

« Last Edit: November 08, 2020, 11:25:19 pm by EEVblog »
 
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Offline Ranayna

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Re: EEVblog #1346 - How An Infrared Optical Touch Screen Works
« Reply #1 on: November 10, 2020, 09:23:24 am »
I think the large SMART Whiteboards and SMART Displays use the same or a similar technique. They also have that inner rim, but with the large boards this rim is significantly wider, i think it's more than a centimeter.
I don't know when the next time will be that i use one of them, due to corona induced homeoffice, but i will see if i can find out how many sensors those use.
 

Offline ludzinc

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Re: EEVblog #1346 - How An Infrared Optical Touch Screen Works
« Reply #2 on: November 12, 2020, 01:15:42 am »
*YouTube* is currently not playing videos.

Finally decided to watch on Lbry!

https://lbry.tv/@eevblog:7/eevblog-1346-how-an-infrared-optical:4

 

Offline thm_w

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Re: EEVblog #1346 - How An Infrared Optical Touch Screen Works
« Reply #3 on: November 12, 2020, 08:40:51 pm »
I'm surprised this display style was not more popular, it seems incredibly cheap to produce.
Sure on consumer gear now touch displays are getting cheap, but industrial displays are not. Although I think this display would be confused if it were raining, causing issues, so it likely wouldn't work outdoors.
 
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Offline Ranayna

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Re: EEVblog #1346 - How An Infrared Optical Touch Screen Works
« Reply #4 on: November 13, 2020, 07:36:14 am »
I don't think this would work well in an industrial setting. As Dave mentioned, and i noticed myself, those screens are quite susceptible to dirt accumulating on that reflective surface. Especially the lower lip and the lower corners are where the crud accumulates if the screen is not regularly and properly cleaned.
 


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