# Would any maths be needed for this?

1. Oct 26, 2008

### questions_uk

Not sure if the question wants description and maths or one or the other. the question is:

A device responds to the RMS waveform given by:

V ^ 2 RMS 1 / T Integral T on the top and 0 on the bottom V ^ 2 (t) dt

Show that the on off pixels in an N line matrix get voltges given by

V ^ 2 on = 1 / n ( V ^ 2 + 2vsvd+ nvd2^2)

V ^2 off = 1 / n (V^2s - 2vsv+NVd^2)

show that the addressing is max'd when

Vs / Vd = sqre root of N

Giving the result

Von/voff max = square root of square root N + 1 / square root of n - 1

any tips appreciated.

thanks

2. Oct 26, 2008

### Mentallic

You will have to show this mathematically. I don't see any part of the question that implies you will need to describe the relationships, but sometimes your solutions need to be backed up by a description so you can simply show what it is you just concluded from your solution.

3. Oct 27, 2008

### questions_uk

Thank you for your reply. could you give some hints as to how to do this question?