# IPS display tech ## Overview IPS = "In=Plane Switching" ## IPS panel layers (top-to-bottom) * glass surface - protects the layers below. The glass may be smooth and glossy or it can be etched so that it provides both anti-glare effects as well as some physical texture or a drawing tablet pen * Front polarizing filter - polarizes light in the other direction (i.e. horizontally) * Color filter glass substrate - r,g,b filters aligned to the sub-pixels in the TFT glass substrate. Light going up from here now have color * Liquid crystal layer - Controls which subpixels can be seen by selectively controlling what light below passes through. * TFT glass substrate - thin sheet of glass with microscopic circuitry with sub-pixels, light from below passes up through layer. * Rear polarizing filter - polarizes light in one direction (i.e vertically) * Diffuser and Prism films * Light Guide Plate - Evenly distributes the light from the BLU across the entire screen * Backlight Unit (BLU) - LED lights provide illumination --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.sevenpens.com/drawtab/tech/ips-display-tech.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.