With Pixel Pitch (of English. Pixel pitch) is the direct distance between the pixels on image sensors or screens ( there also called dot pitch) which, at pixel center to pixel center.
However, the smaller the distance between the individual photodiodes each other fails on an image sensor, the higher the video resolution possible for a given size of the sensor, the lower the amount of light quanta falling on the single diode.
A higher while maintaining the same size sensor megapixel count is thus paid for by a lower amount of light per pixel, which increases the cost of the camera's internal signal amplification and image processing. So the image quality is often the case with digital cameras in an increasingly sophisticated signal conditioning improves. This is done partly by the massive use of softeners and contour amplifiers which, while reducing the noise, the resolution, however, may deteriorate by the reduction of the image information.
The smaller the pixel pitch, the lower the value of the beneficial aperture, so the aperture above which the resolution is decreased due to diffraction effects. So shrinks with the pixel pitch of the aperture area in which on the one hand aberrations by stopping down to reduce, on the other hand, no diffraction blur occurs.
In an F-number of 2.0 and a light wavelength of 550 nanometers ( maximum sensitivity of the human eye in the countryside ), the diameter of the diffraction disk at a picture of an infinitely remote, in-focus point is, for example 2.7 micron and even with a f-number of 16.0 21 microns. In 6000 pixels in the image width under these two conditions would have image sensors with a width of about 16 millimeters and 126 millimeters are used. Even with the use of highly corrected lenses with very high optical resolution, it makes little sense to work with image sensors having a smaller spacing of the pixels on the sensor than that required by the size of the corresponding diffraction disk.
- Image sensor