# How is the picture (image signal), acquired by the sensor, shown in a display?

Let's consider a CMOS sensor with N number of pixels. For the sake of simplicity, let's consider an hypothetical Black and White sensor. Each pixel catches the energy provided by the input luminance seen through entrance pupil of the lens. It generates a charge (Coulomb) per pixel area which is proportional to the input luminance. This charge is read through an external circuitry and eventually amplified. The output signal is a voltage or current which is proportional to such a charge and hence to the input luminance.

So, the image signal for each pixel is a current (or a voltage) proportional to the input luminance. Now, how is such a signal displayed?

More Current provided by a certain pixel --> More white on the screen on that pixel? If it works in that way, the perceived luminance of an image will depend on the pixel area

More Current provided by a certain pixel normalized to the pixel area --> More white on the screen on that pixel? If it works in that way, bigger pixels does not imply brighter images

• I have to ask... what photographic problem are you trying to solve? This sounds like an electrical engineering question to me. IMHO one of the negative aspects of this site is how it attracts/tolerates engineering questions, losing focus on actual photography. Nov 25, 2022 at 23:11
• @osullic my photographic problem is: will a big sensor provide higher exposure with same iso, shutter speed and F number? Nov 26, 2022 at 1:41
• OK, so, ask that. Nov 26, 2022 at 11:37