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Black And White Uniformity, Viewing Angles

Touchscreen Computing: Gateway ZX4931 And HP TouchSmart 310
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Another measurable aspect of panel performance is brightness uniformity. Most manufacturers calibrate displays based on the center point of the screen. However, every area of the screen behaves differently. Sometimes you can get better performance in one specific region. As a result, we have added a nine-point black and white luminance test to measure the performance of each monitor's panel.

Gateway One ZX4931
White Luminance cd/m^2
137.7135155.0922141.8398
140.4738163.2266144.9958
139.0497151.8800141.6339
Black Luminance cd/m^2
0.19700.21070.1861
0.14990.19980.1730
0.16180.22060.1403


The ZX4931 produces a high white luminance towards the center, and the values fall off as you move toward the corners. Black production is a little better, but the center-top and center-bottom areas of the screen appear brighter. The overall uniformity is poor, and viewing angles tend to enhance the visual differences between regions.

HP TouchSmart 310
White Luminance cd/m^2
145.8242168.2889170.8824
147.8051180.3175167.0457
162.6824175.5959174.7452
Black Luminance cd/m^2
0.14780.16670.1835
0.15830.16150.1702
0.18490.21370.1832


HP's TouchSmart 23" produces decent overall uniformity, but it has weak white luminance near the left side. In actual use, we only see a problem if you are viewing the display from the left. Black luminance is mostly even, though the center-bottom edge tends to appear slightly brighter.

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  • 1 Hide
    compton , May 12, 2011 4:31 AM
    This article was worth what I can only assume was a torturous trip to Best Buy. But curiously, I'm not thinking about all in ones, but rather touch screens. Dell makes an eIPS panel with a touch screen for not a ridiculous sum of money. I've been considering it for a foray into touch screen computing on my desktop where I have the juice to do it right.

    Toms strikes another blow against boring reviews. Good job.
  • 0 Hide
    flong , May 12, 2011 6:00 AM
    Interesting subject - could this really be the computer's future? I don't think that the keypad will be replaced until voice control is more mature.
  • -1 Hide
    Anonymous , May 12, 2011 6:39 AM
    Voice control is not the future; it's been around forever. Until computers can think, you can't talk to them.

    In reference to the article, while desktop DIY rigs are definitely orientated to serve a central purpose, these all-in-ones are just as purpose built to serve an environment. (eg kitchen, living area)

    Make touchscreens more seamless. By seamless I mean cheap. Where is the touch screen film I can just roll over whatever I want? How about a coffee table that recognizes my devices and my Heineken?
  • 2 Hide
    flong , May 12, 2011 7:49 AM
    Voice control has been around forever - duh. Brilliant observation. And while we are making observations, there is at least one computer you can talk to, IBM's Watson, which won jeopardy. Quality voice control is just coming into being.

    What I meant was that until we have better voice control / input, a keypad will be necessary because typing on a vertical touchscreen, which is obviously awkward, would not suffice to do say a high school homework assignment.

    Even with better voice input there may be some physical interface like a mouse. Right now cutting edge voice control for consumers is what we find with Ford's "Sync." But that would not work for a work station.

    Touch screens like the Ipad have their strengths but nobody thinks they will replace computers with keyboards (nettops excepted).

    However, if we have a "Watson" interface where we can provide input via voice control: that is the future of computers. With Watson you could virtually ask it to do any function, search any website or dictate a spreadsheet to it. Per your example, you could ask Watson to make your coffee and then put the morning newspaper on the built-in LCD coffee table viewer, turn the AC down to 75 degrees and find out what traffic is for the morning commute and it would be cable of doing all these things with voice input only. Bill Gates's home has many of these functions without an AI interface.
  • 0 Hide
    Anonymous , May 12, 2011 11:53 AM
    I hate touch screens, bringing it to the PC just annoys me, I dont want to touch my screen, do not see a use for it...

    The next step forward is voice control that works!
  • 1 Hide
    cknobman , May 12, 2011 1:52 PM
    This article is one of the worst I have ever seen on Toms Hardware. It seems rushed, is missing tons of relevant information, and basically skims over the most important features of a touchscreen computer.
  • 0 Hide
    Anonymous , May 12, 2011 1:55 PM
    On the HP display ... is it 20" and ??? as on the lead page or is it 23" and 1600x900 as on the Display Spec page ? Because HP says it's 20" and a 1080P display for the 310 series.
  • 2 Hide
    molo9000 , May 12, 2011 3:45 PM
    Touch screens on desktops are an ergonomical nightmare

    Just point your finger at your display for a while. Your arm will start hurting after about 2 minutes.
  • 0 Hide
    acku , May 12, 2011 3:52 PM
    MacTheKnifeOn the HP display ... is it 20" and ??? as on the lead page or is it 23" and 1600x900 as on the Display Spec page ? Because HP says it's 20" and a 1080P display for the 310 series.


    Fixed!
  • 0 Hide
    acku , May 12, 2011 3:56 PM
    cknobmanThis article is one of the worst I have ever seen on Toms Hardware. It seems rushed, is missing tons of relevant information, and basically skims over the most important features of a touchscreen computer.


    If you want to see something specifically please let us know. If there is one thing missing, it's more discussion on software/touchscreen demos, but we provided these as videos. And, as this is Tom's Hardware not Tom's software, we wanted to focus on the hardware.
  • 0 Hide
    acku , May 12, 2011 3:58 PM
    Quote:
    Interesting subject - could this really be the computer's future? I don't think that the keypad will be replaced until voice control is more mature.


    A cooler setup would be something ala Minority Report. Think of Kinect on steriods...
  • 0 Hide
    flong , May 12, 2011 4:06 PM
    Tom's Hardware - don't listen to cknobman, this was a fascinating article and you guys do a great job with your reviews. I am not that interested in touch-screen computers and I enjoyed reading it.
  • 0 Hide
    acku , May 12, 2011 5:04 PM
    Quote:
    Tom's Hardware - don't listen to cknobman, this was a fascinating article and you guys do a great job with your reviews. I am not that interested in touch-screen computers and I enjoyed reading it.


    Thanks for the kudos!
  • 1 Hide
    stuart72 , May 12, 2011 6:54 PM
    molo9000Touch screens on desktops are an ergonomical nightmareJust point your finger at your display for a while. Your arm will start hurting after about 2 minutes.


    Yup, not to mention that with a 24" monitor I sit 4 foot from the screen and only have 2 foot 6 inch long arms...
  • 0 Hide
    virtualban , May 13, 2011 10:20 AM
    ackuA cooler setup would be something ala Minority Report. Think of Kinect on steriods...

    That is right. That is the future. Anything else will not make it to the times when brain-computer-interface will change forever the way we interact in full productive ways with the machines.
    BCI + projected into the retina displays will be the step right before nanomachines will be able to hijack our I/O nervous system.

    Exciting future is ahead. Keep healthy people or you risk not seeing it.
  • 0 Hide
    Anonymous , June 21, 2011 5:41 PM
    I would like if I could get it with out the 'touch' screen.
  • 0 Hide
    Anonymous , July 4, 2011 5:38 PM
    Why not cite an overall preference with details why?

    My friend just bought a Gateway ZX4931 and is thrilled with it. It seems that the angle of the HP all-in-one is straight up. Wouldn't that be harder to look at over extended periods of time? Another thing is that the Gateway unit has a line of light under the display. I thought this would be an annoyance but it actually adds. There is no mention in your article. BTW, the Gateway display is fabulous. Is the HP equal? The Gateway has five USB slots in the back (as well as the two on the right side). This adds functionality, but it seems a hassle to go to the back of what is the unit's bulkiest part. No mention....

    I never heard of Tom's Hardware, but I share the view that at least this comparison piece was superficial and weak. A real nuts and bolts value comparison between the two would have been "outtasight!" I don't see how your article as it is would aid a shopper interested in models made the ways these two are, especially a shopper who is not technically up on things. I didn't see the HP unit in action, so to speak, but I can say that the Gateway ZX4931 makes what I've been using seem like from another era!