Car Head Unit LCD LVDS to HDMI
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An RTD2662 board may be suitable for you (I'll not give any links here, you can find the board from some online suppliers). It accepts HDMI and VGA as input and outputs 1- or 2-channel LVDS signals. A lot of pre-compiled firmware files for different resolutions are also available for that board. But the only way to upload a flash file into that board is to use the I²C lines placed on the VGA connector. So you'll need also a USB-to-I²C converter (e.g. FT232H). There is a few open-source/free flash programming software available online.
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