Backlight In And Out Voltage

Hi AGS. A well drawn schematic should follow certain conventions to make reading them easier. In general, the iPhone schematics are very good and easy to read whereas some of the Android device schematics I have seen can be a bit confusing.

Input voltage is usually on the top or top right of the schematic. Other signal inputs are also usually on the left. All outputs should be on the right. Power rails are usually thicker lines whereas digital signals have a thin line. This is well respected in the snippet you have attached to your question. Overall, the flow should be left to right and not vertical and everything should be broken out within functional blocks with easy to understand netnames.

There is a lot good information here if you want to read through it. Also, the EEVBlog recently put out a video to address this, it’s an interesting watch.