The MIPI DSI (Mobile Industry Platform Alliance Display Serial Interface) is the current industry standard for interfacing most smartphone LCDs to the device's CPU/GPU. MIPI is a consortium of mobile (and other) hardware vendors that standardized interfaces of many handset internals (for example CSI for camera modules).

The bad news is, MIPI's specifications are available after signing and NDA and paying a small fee. The good one is, that there's enough bits of information available in the Web to put together a working DSI host. Here's some links:

* Korean blog devoted to MIPI DSI * Texas Instruments' DSI to LVDS converter datasheet. Lots of info on the protocol. * Demystify DSI I/F. Nice app note, also from TI.