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Ultimachine LCD Issues
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oliver created this task.Apr 2 2019, 3:33 PM

This ticket is to track and record all problems with the ultimachine lcds and response from the supplier.

oliver added a comment.Apr 2 2019, 3:37 PM

Talked with Ultimachine about the discoloration and 'bleed' present on several screens.

Ultimachine responded earlier to me after they had reached out to their supplier and responded with some corrective action they will be taking on their part. This also includes some corrective action for the 'bowing' of the screen.

For the first picture, It is obvious that the contrast set to too thick, Pls change it to darker and try again, It will look much better that way, They looks a little bit bleedy because STN type display have limited viewing angles, The color will looks different when viewing from different directions, Yet the color will also change due to slight voltage difference on each pixel.
For the second picture, If you adjusted the contrast to darker, The bow shall disappear or at least not that prominent, You will see bow problem because when metal bezel gives pressure to the glass, The structure of the glass cell will change which causing such a effect, This kind of problem normally exist on Yellow-Green or White on Blue display, If you could use Black on White type, There won't be such a problem.

oliver added a comment.Apr 2 2019, 3:39 PM

Another issue is missing pixels on the LCD screen as stated in ticket T6220.
Pictures will follow and a response to the supplier will be sent.

oliver closed this task as a duplicate of T6220: LCD screen.Apr 2 2019, 3:39 PM
oliver reopened this task as Open.
oliver merged a task: T6220: LCD screen.
oliver added subscribers: wolffchadd, kent.

Ultimachine has sent us a min and max samples of their range that they will be setting the voltage on V0 at for the screen. One of them also has an extra hole on the back where we could adjust that pot after the lcd has been assembled.

kent closed this task as Resolved.Aug 16 2019, 1:15 PM
kent claimed this task.

Nice work on working with ultimachine to have them rev their design to allow access to the contrast adjustment knob, @oliver.