# Pixel resolution phototransistor array

I would like to ask if anybody knows some technology which is like array of phototransistor with accuracy in mm . Like some display on which I put someting and get by wire data of pixel which are shadowed, just only logic state ( 0 = Nothin/Ligh, 1 = Someting is put down on screen/Dark).

000
010
000


My first idea was solve it by many phototranzistor in matrix, but it haven't that necessary accuracy which I would need. ( I think even SMD phototranzistor for this are so "big").

Thanks everyone for some help, and I'am sorry for my poor English. I hope you have get it what I've been wrote there.

• Welcome to EE.SE! If I understand correctly, you're looking to buy this component, not to make it yourself? That makes this question off topic following the guidelines ([help:on-topic]). I'm voting to put this question on hold until this is clarified. But besides that, isn't what you're looking for a simple low-resolution B/W camera? It depends with what kind of chip (and other factors, like power consumption) you want to read the data if that's a possibility, of course. So also this would be good to mention in your question! Thank you :) – user17592 Aug 3 '14 at 9:31
• An array of light sensing devices? Sounds like a camera. – Phil Frost Aug 3 '14 at 12:18
• @Camil: Since he's asking about the technology and how to do it and not for where to buy it, I don't get that it's off topic at all. – EM Fields Aug 3 '14 at 12:25
• @OP: How many pixels do you need and what kind of accuracy are you looking for? – EM Fields Aug 3 '14 at 12:29

You can use an optical mouse sensor, basically a low resolution B&W camera. The Agilent ADNS-3040 is one such sensor. You might need some optics for your application.

• That's a clever approach. You can even read out the 22x22 pixel array "for diagnostic purposes" which makes it a lot easier to test alternative optics if you use it for applications other than as the guts of a mouse. – RBerteig Dec 31 '14 at 22:52

I would suggest that you use a 2D CMOS sensor.

These are arrays of very small micro-meter size light detecting elements. They are easily found like 640x480 arrays. The complete sensing size of the chip would be some mm^2.

And, because it seems very important to you, the relative positioning of the sensing element on the array is almost perfect. (tolerances in the micro-meter range, maybe better)

If you don't need that resolution, just bin the pixel. That would decrease the noise and reduce the amount of provided data.

Unfortunately, you didn't specify what the application is. This solution requires that you plug your sensor into a MCU (which may require to be a fast one) or any kind of digital system such as CPLD, FPGA etc...