Hi! Your e-mail directed us to post here. The following was written with a report via e-mail in mind, so pardon the non-forum-like formatting.
Screen corner damage on Azumo 12561-06_A1 received from Digikey
Our assembly partner notified us, that they had found many screens with damage on the corner of the glass where the screen protector peel handle and LED ribbon is.
We conducted an inspection of some of the screens still in our own warehouse (23 pcs: 3 full 6-screen trays plus a 5-screen tray presumably repacked by Digikey).
The full order was 125 screens.
Screens came packaged in vacuum-formed trays: Presumably originally packaged by Azumo, given that the frames account for the light guide and LED ribbon cable.
5 screens were packaged in a large ESD dissipative MiniGrip bag, between two trays taped together.
Others were packaged in two silvered ESD bags, 11 taped together trays (60 screens) per bag.
Inspected the 5-screen package and three trays from one of the bags.
Types of defects
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Chipping damage to the left bottom corner (rare, minor). Marked in included table column “Left bottom”
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Chipping damage to the right bottom corner (common, both minor and potentially significant, occasionally with both rear and front glass chipped). Marked in included table column “Right corner”
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Scratch marks on the right bottom corner, around the datamatrix (occasional, unknown significance). Marked in included table column “Scratch”
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Dark areas between front and back glass on the bottom edge in the bottom left corner (occasional, unknown significance). Marked in included table column “Dark patch”
Type 1 is likely functionally insignificant.
Type 2 is hard to assess: to cause the more severe examples it seems significant impact would be required. I do not have the data to assess how that would affect screen longevity.
Type 3 is likely functionally insignificant, except where it has actually scratched the polarizer.
Type 4 could be ink where it is not supposed to be, but I took note of it because I considered the possibility of the liquid crystal leaking between the glass lamination and causing this visual artifact.
File naming convention
Image files are named as “xx_YY-MM-DDThh-mm-ss.jpg”. “xx” is the screen index in order of inspection, with 0 denoting images that do not correspond to an individual screen.
Images are taken with either cell phone camera or microscope coaxial camera, and correlated by timestamp.
Table.xlsx contains a subjective evaluation of the damage for every screen. See images.
(Image data download link redacted for now. I assume the forum has a way to share links privately with official support?)
Collated data
Of 23 screens:
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2 had moderate chipping at the lower left corner
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2 has minor, 10 had moderate, and 7 had severe chipping of the lower right corner
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3 had minor, 1 had moderate, 2 had severe scratching at the lower right corner
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4 had minor, 4 had moderate, 5 had severe black blotches between the screen glass at the edge.
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One (screen no. 11) had ink or some other dark substance at the top right corner
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One screen (screen no. 9) has a forward-bent data ribbon (which breaks the ribbon). This is presumed to be caused by me during unpacking, and is not the subject of this communication.
Requests
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For each type of defect, please qualify whether the damage affects screen reliability when used as-is.
- If the reliability is not affected, is there a plan to reduce these, or should we assume these defects to be normal?
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Please send us a go/no-go inspection guide for visually validating the screens pre-assembly.
Examples of damage:
Good:
Severe chip and scratch damage right:
moderate chip damage left:
