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u/T_r_i_p_l_e_A

Image 1 — Update: It's (likely) not a photomask
Image 2 — Update: It's (likely) not a photomask
Image 3 — Update: It's (likely) not a photomask
Image 4 — Update: It's (likely) not a photomask
Image 5 — Update: It's (likely) not a photomask
Image 6 — Update: It's (likely) not a photomask
Image 7 — Update: It's (likely) not a photomask
Image 8 — Update: It's (likely) not a photomask
Image 9 — Update: It's (likely) not a photomask
Image 10 — Update: It's (likely) not a photomask
▲ 40 r/Semiconductors

Update: It's (likely) not a photomask

This is a followup to my previous post (https://www.reddit.com/r/Semiconductors/s/6KMhAVG9up)

A friend of mine has a microscope and we looked at the patterns on the glass. Although the patterns looked like solid green, teal, purple, etc from afar, up close I can see tiny square cells of red, blue, or green. The greyish rectangle on the glass were actually rows of red, green, and blue, reminiscent of a display. The other rectangles had different mixtures of these cells. I also took some pictures of the surrounding patterns on the chip.

We researched more about it, and we think this might be related to a discontinued display technology called IMOD. Qualcomm acquired the tech from Iridigm in 2004 and they used the brand name Mirasol. However, this is a guess since we couldn't find other images of this technology from under the microscope.

u/T_r_i_p_l_e_A — 2 days ago
▲ 50 r/Semiconductors

Is this a photomask?

I purchased this from a flea market. I think this is a photomask but I'm not entirely sure (I thought photomasks are clear, but this has some color to it). It says Qualcomm 2007 on it and the pattern appears to repeat in groups of 6. If this is a photomask, what are your best guesses for what this circuit would be used for?

u/T_r_i_p_l_e_A — 3 days ago