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Tablet PC's in Bright Sunlight?
chadma asks: "I'm developing a program to be used on a Tablet PC; the unit will be used outdoors >80% of the time. I've seen some tablets from ViewSonic and MotionComputing and wondered if anyone had any experience or suggestions in the best screen for high sunlight conditions. Has there been any study or anyone with experience that could suggest the colors we use in the design? Would a white background with black text be most appropriate?"
Look at NEC or Fujitsu's pen-based computers; they predate TabletPC and they have offered displays that can be used in direct sunlight for years. They probably have updated them to TabletPC software by now.
Many PDAs are also usable in direct sunlight, so if your software is portable, you could run it on something like the Sharp Zaurus.
But have you considered oh I don't know...
Allowing your users to choose the colour scheme of the program, to provide the best visability in whatever conditions they're in?
Use more contrasty colors (black and white are good) in order to make your text stand out from the background. Let the TabletPC owners and makers worry about glare, but make sure that your text is easily visible through polarized sunglass lenses.
I have been pwned because my
chadma sez: "Would a white background with black text be most appropriate?"
You'll get the higest contrast with the brightest and darkest color. Black is, of course, the darkest. The brightest is that slightly chartruse yellow you see on some emergency vehicles and safety gear. It's the brightest because it stimulates the most receptors in the eye (the maximum overlap between the red receptors and green receptors). For the same reason, it'd also be the most efficient for a given visual level.
Higher contrast is harder on the eyes, but you'll be fighting sunlight so the contrast of the screen will be relatively much less than that of the environment.
To keep the glare from the screen down, wear polarized sun glasses You might even be abloe to combine them with a polarizing filter on the screen to make it more visible while the environment appears darker.
"I may be synthetic, but I'm not stupid." -- Bishop 341-B
Look for a trans-reflective display.
These work best in bright sunlight, although can appear washed out in dim indoor use.
Kids today are tyrants. They contradict their parent, gobble their food, and tyrannize their teachers. - Socrates 400 BC
who even uses these, ahem, Tablet PC's ??
Just in case your are developing with Linux, here is a list of Linux installation reports on Tablet PCs, Pen Pads, Convertibles and WebPads. This might as well serve as a concise overview about available Tablet PCs in general. There are also pointers to Linux applications for such machines.
A much better place to ask this question would be the forums over at Tablet PC Buzz. It's a great forum for Tablet PCs, and almost all of the people there own one, so you'll get a better representation from them...
Actual, much better than trans-flective is the cholesteric display. It actually looks better in direct sunlight than it does indoors! And it takes very little power, power consumption is proportional to how many rows you redraw (power is only consumed when you update the image, unlike a normal LCD which is related to time and brightness). Downside is refresh rate, you can about 4hz full-screen, or 8hz half screen, or 16hz quarter screen, etc. You will have problems finding these displays in commercial products, but if daylight readability is absolutely critical it may be worth paying to have some installed after-market.
I know there's value in asking people about their past experiences with similar problems, but all too often what you get is people's opinions about your problem, experience-based or not. Another approach would be to mock up a couple of interfaces and get some honest-to-god users. Take them all on a field trip outside and test the various color combinations. Finally, as Drakin suggested, consider providing a small range of reasonable color choices, make the default the one that tested the best overall, and let each user pick the colors they want.
I have an actual Tablet PC that I use every day, the Acer C110. It's a wonderful tool, but it is not designed for use in the sunlight. Heck, it's not even that good when I sit at a conference room with bright lights above the center of the table - sitting at the edge of the table looking down on a horizontal reflective screen reflects the lights overhead... However, I have the ability to prop up my screen with my old PDA, which solves the issue quite nicely. The angle is just enough to avoid the lights. :)
;) Anyway, this is not your best forum for TabletPC advice. I suggest you try heading over to TabletPCBuzz and use the forums there, you will find a TON of experts on the TabletPC.
The TabletPC is a wonderful tool. I wouldn't give mine up for anything in the world. Well, maybe something with a greater monetary value that I really wanted, as I would then go and buy myself another TabletPC - they're not in short supply.
Regardless of that, there's really a couple solutions:
a) If your application is a commercial app, designed to be run by just about anyone that chooses to purchase it, I'd suggest creating a "skins" menu for it, similar to the option within Franklin Covey's tabletplanner 3.0. This will allow your outdoor mostly users to pick a high contrast scheme, whereas the indoor users (or users who avoid using it until they are indoors) will pick a different one. Heck, even allow some form of button mapping to different schemes, mapped by default to your presets that test best under different conditions.
b) If you're targeting a vertical market and intend to design the whole solution, start to finish, I recall someone designed a TabletPC designed specifically for use outdoors. You could work that particular model into your design specs, and test your app out with the PC in question and the best looking/working colors, etc.
I apologize, as I do no recall what the specific model or maker was - I suggest you ask your question in the general forums at TabletPCBuzz. They will be able to provide you with further information.
Best of luck,
-Jack Ash
No apostrophe is required for a plural.
Then there's Dave Barry's comment: In modern English spelling, an apostrophe is used to warn the reader that an "s" is coming.
Those who do study history are doomed to stand helplessly by while everyone else repeats it.
get one of those camera hoods from around the turn of the century...
"If you think you have things under control, you're not going fast enough." --Mario Andretti
Your outdoor-oriented 'hello world' program is very interesting to us.
A circular polarizing filter might be the solution to the display problem, but there's a catch: LCD screens emit polarized light, so the linear polarizer must be matched to the LCD's polarization after it has traveled through the circular polarizer.
Anyone know if circular polarizing filter material is available in sheet form?
For LCD viewing in sunlight conditions, you want to have a brightness of at least 150 foot Lamberts. Generally the CCFTs will degrade over time, so derate that by 50 foot Lamberts. You are looking at a spec of 200 foot Lamberts in your backlight brightness. Not common in off the shelf laptops.
The contrast ratio needs to be greater than 200:1. The higher the better.
You also want Anti Reflective coating applied to the front of the LCD. This causes reflections in the screen to be diffused and blurry, instead of sharp and clear.
Holland
I have a tablet PC, so I feel like I should know the answer to this. The problem is I live in Seattle, so I don't acutally know what direct sunlight is.
I have a motion computing M1200, and it is passable in bright overcast skies. I'm curious of whether it would actually perform better in direct light compared to the diffuse depressing grey that is standard here.
If I ever see the elusive daystar, I'll bring my computer outside and give it a try.
I'm a vampire you insensitive clod!
It's optional and recommended after an acronym
As you are already aware, normal color LCDs are unusable in direct sunlight. Many monochrome LCDs, on the other hand, have excellent visibility in direct sunlight -- unfortunately, I don't know of anyone actually building computers that use them these days. It's doubly unfortunate, because when there is direct sunlight, you needn't run the backlight on a properly designed monochrome LCD and can thus realize significant gains in battery life. Finally, color usually doesn't add too much to dedicated devices being used for data collection or many custom applications, so there's often very little need for a color screen in these circumstances, and monochrome would probably frequently be the ideal solution.
Oh well.
Myself and all my friends have an original run Motion Computing tablet (M1200, 800mhz, 1gb ram). The tablets themselves are the greatest things in every way other than their screens. The backlight is horrible and makes the colors washed out and hard to see at an angle even in low light conditions. In sunlight, forget about using it at all.
In terms of the glare I would suggest that you do not use a dark background. Glare is by definition reflected light so by using a dark background you increase the perceived glare.
On a different vein, my glasses are treated with an anti-reflective coating that allows people to see my eyes instead of white discs (and makes night driving a pleasure instead of a stress). Does anyone know of any screens that incorporate this sort of technology?
Q.
Insert Signature Here
Motion computing makes a version of the M1300 tablet pc that uses a transflective display. That display works wonders outdoors. Call them up at 866-MTablet and ask about it. I've got the normal version of the table (writing this post on it right now) and LOVE IT!!! Only think i wish i could get was ink-enabled AIM. That would rock.
slashdot username - at - email.domain.name
That should be:
"...In modern Engli'sh 'spelling, an apo'strophe i's u'sed to warn the reader that an "'s" is coming."
Don't you feel 'safer now? I hate being 'surpri'sed by the letter between "r" and "t".
Indeed. As I hit the Submit button, it occurred to me that I should have gone back and inserted those apostrophes. Well, you're welcome to the karma points ...
;-)
(We might note that Dave didn't do this, either. Sometimes he misses a dumb joke, too.
Those who do study history are doomed to stand helplessly by while everyone else repeats it.
Actually: no, retard boy. You couldn't be more wrong...
Only tablet with tranflective display that I know of.