The LCD TFT panel specification shows an 18-bit data bus, but the LCD controller can store data only as 16bpp (bit-per-pixel). Can I display 16bpp on an LCD TFT panel with 18-bit data bus?
Yes. The TFT panel data bus width is independent of the data stored in memory. The LCD controller will internally expand the number of bits stored the memory to match the LCD panel data bus width. In the above example, 16bpp will be expanded to 18bpp by duplicating the 2 msb’s to the missing 2 lsb’s of the 18-bit value. Please note that the number of colors is still determined by the bit-per-pixel format used to store a pixel in the memory, it will note change by the expansion to match the LCD panel data bus width. Read more…
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