[visionlist] [cvnet] Seeking advice on touchscreens

Thu Oct 5 17:22:38 -05 2017

Dear Gislin,

There is also a good range supplied by Huaxintouch;
http://www.huaxintouch.com/Product/index/cat_id/2

Existing touchscreen technologies range from resistive, to capacitive, to infrared beam scattering. Resistive has always been considered robust for public display screens (can handle bad treatment) but suffers from the need for the heavy pressure that you describe.

iPad screens are capacitive, which allows for a measure of applied touch pressure.

The infrared technology seems to be the default now for larger screens (above 15 inch). This supports multi-touch but, as you say, may sometimes register a false positive if the finger is near the screen but not yet touching.

We have been using a “Multi Touch Screen Overlay T-series Kit” from CycloTouch (https://www.cyclotouch.com.au/product_info.php?products_id=2506), but I believe this is rebranded from Huaxintouch. It has worked well, but needs to be clamped to an existing screen and would usually block access to the control buttons for the host screen. For that reason, we have ordered a large Philips commercial display (43BDL4051T). It’s in the mail, but now you have me worried that the touch sensitivity may be insufficient. I will let you know how it goes.

Two work arounds you have probably already considered; ensure sunlight is not hitting the screen, and provide audio feedback to the participant when their finger touch has been successfully registered.

Best
Matt

From: visionlist [mailto:visionlist-bounces at visionscience.com] On Behalf Of Ankur Gupta
Sent: Thursday, 5 October 2017 10:47 AM
To: William K. Stell; Yury Petrov; gislin at jhu.edu
Cc: CVNet; Visionlist
Subject: Re: [visionlist] [cvnet] Seeking advice on touchscreens

Try elo touch products (https://www.elotouch.com/). We are using it in our lab and it's performance is satisfactory. Also it can easily be integrated with psychtoolbox in matlab.

On Thu, Oct 5, 2017, 01:24 William K. Stell <wstell at ucalgary.ca<mailto:wstell at ucalgary.ca>> wrote:

Perhaps a row of iPads (thinking of the way Cerebral Mechanics made a virtual optokinetic grating cylinder from a box of 4 monitors (OptoMotry).

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From: cvnet-bounces at lawton.ewind.com<mailto:cvnet-bounces at lawton.ewind.com> <cvnet-bounces at lawton.ewind.com<mailto:cvnet-bounces at lawton.ewind.com>> on behalf of Gislin Dagnelie <gislin at lions.med.jhu.edu<mailto:gislin at lions.med.jhu.edu>>
Sent: October 4, 2017 2:58:24 PM
To: Yury Petrov
Cc: CVNet; Visionlist
Subject: Re: [cvnet] Seeking advice on touchscreens

Thanks, Yury.

Most of our tests are at arm's length, so an iPad is too small to allow the
necessary eccentricity range, unfortunately.

Best, Gislin

On 4 Oct 2017 at 20:30, Yury Petrov <yury.petrov.4u at gmail.com<mailto:yury.petrov.4u at gmail.com>> wrote:

Apple has nice touch screens. Did you try iPad? I use them for eye-hand
coordination test.

On Wed, Oct 4, 2017 at 10:41 AM, Gislin Dagnelie
<gislin at lions.med.jhu.edu<mailto:gislin at lions.med.jhu.edu>> wrote:

Dear colleagues,

For some of the eye-hand coordination tests and phosphene mapping tests
in my lab we have been using touchscreens for a number of years, but we've
not always been happy with their reliability.

With some, it appears that proximity of the finger is enough to register a
response, whereas with others a finger press goes unnoticed if the area
touched is too wide or the pressure too low.

Has anyone found a type/brand/model that they worked reliably for many
subjects?

If you have given upon touchscreens, what alternative (e.g., a 3-D tracker)
have you used instead?

Please feel free to respond in private or to the list.  I'll compile the responses
I get by this weekend.

Best regards,

Gislin Dagnelie

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