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Old 03-27-2018, 09:46 PM   #1
ghostwheel
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[DPT-RP1] straight lines?

On my new RP1, lines don't seem to be straight. Drawn with a ruler, I get strange
wriggles. Even in the calibration page, when I draw the X, I get strange wriggles, so it is hard to calibrate. Is it just mine? Should I return it?

Below you can see my lines. All drawn with a ruler on screen (zoomed in... click for full page)





Actually, in this video you can see the problem a bit when the X is drawn. Mine is a bit worse, because the wriggle is in the middle of the X, not the edge:
https://youtu.be/ULCjmqKa5YU?t=5m36s
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Last edited by ghostwheel; 03-27-2018 at 10:03 PM.
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Old 03-28-2018, 07:20 AM   #2
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I heard the screen is not straight, so it may draw the line right, just that it will follow the curvatures of the screen and become wavy.
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Old 03-28-2018, 10:53 AM   #3
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My screen looks pretty straight.
I just tried Onyx Max, and it doesn't have the wavy line problem.
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Old 03-28-2018, 11:06 AM   #4
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My feeling is that it is an anti-aliasing algorithm gone wrong. The waviness seems to depend on the angle and is very regular foreach angle. Could it be that the resolution of the pen is lower than that of the screen, and Sony is trying to make up for that?

Does the RPT-S1 have this problem?
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Old 03-28-2018, 12:55 PM   #5
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Sony support said it is a problem with the pen, and they will send me a replacement pen.
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Old 03-28-2018, 09:47 PM   #6
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Quote:
Originally Posted by ghostwheel View Post
On my new RP1, lines don't seem to be straight. Drawn with a ruler, I get strange
wriggles. Even in the calibration page, when I draw the X, I get strange wriggles, so it is hard to calibrate. Is it just mine? Should I return it?
It looks like perfectly wriggled straight line to me.
Why would you need perfectly straight line anyway.
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Old 07-27-2018, 05:34 PM   #7
natwest
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@ghostwheel did the new pen from Sony solve the problem? I'm having the exact same issue and on most days my DPT-RP1 is basically unusable for any kind of writing. On some days the problem is worse than on others.
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Old 07-30-2018, 05:26 AM   #8
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I'm not sure what solved the problem. Amazon actually sent me a replacement tablet. I tried all combinations of pen x tablet but couldn't see much difference, and now the problem is almost gone. (I kept my old tablet with the new pen).
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Old 08-08-2018, 07:12 AM   #9
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I have a similar problem, only it gets worse when I'm resting my hand on the tablet next to the lines (click for large version):


(Tablet is lying sideways. The two leftmost lines were drawn without my hand, the others were drawn with my hand resting as shown. Same effect with right hand and lines to the left of my hand.)

This effect only appears when a large part of my hand is resting on the display (a fingertip is not enough), and if the area resting on the screen is "pointing" along the pixel grid lines (up/down or left/right, but not diagonal). The squiggles appear only on the area next to the hand (where it is "pointing" to) as seen on the picture: the lines are less squiggly at the top / bottom. Also, when I put a towel between my hand and the tablet the effect vanishes, so I don't think it is because of the pressure of my hand bending the device.

I am assuming the electronics for the capacitative touch screen conflicts with the stylus in some way. The touch screen electrodes are faintly visible as a horizontal / vertical grid pattern, so it would make sense to me if these electrodes get overloaded in some way by being in contact with too much skin, and then go on to interfere with the stylus sensing part. I don't think it is a problem from anti-aliasing, since the resolution when drawing is actually quite high.

This does not only affect lines, but any kind of shape becomes "bumpy". Because of the way I hold my hand while writing, it can become quite irritating, unless I put a towel or similar below the palm of my hand. Is this a problem by design (does anyone of you have the same problem), or do I have a defective device?

Last edited by mb706; 08-08-2018 at 07:16 AM.
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Old 08-10-2018, 02:37 PM   #10
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Quote:
Originally Posted by mb706 View Post
Is this a problem by design (does anyone of you have the same problem), or do I have a defective device?
Just tested it on my device, and it is indeed your hand interfering with the capacitive screen that causes it
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