S1D13806 Datasheet, PDF (227/730 Pages) Epson Company – S1D13806 Embedded Memory Display Controller

Epson Research and Development
Vancouver Design Center
3.3 Memory Organization for 8 Bpp (256 Colors/16 Gray Shades)
Page 17
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pixel 0
Bits 7-0
Figure 3-2: Pixel Storage for 8 Bpp in One Byte of Display Buffer
At a color depth of eight bpp each byte of display buffer represents one pixel on the display.
At this color depth the read-modify-write cycles of 4 bpp are eliminated making the update
of each pixel faster.
Each byte indexes into one of the 256 positions of the LUT. The S1D13806 LUT supports
four bits per primary color. This translates into 4096 possible colors when color mode is
selected. Therefore the displayed mode has 256 colors available out of a possible 4096.
When a monochrome panel is selected, the green component of the LUT is used to
determine the gray shade intensity. The green indices, with only four bits, can resolve 16
gray shades.
Note
When a monochrome panel (REG[030h] bit 2 = 0) is selected, a four bpp color depth
also provides 16 gray shades and uses less display buffer.
Programming Notes and Examples
Issue Date: 02/02/21
S1D13806
X28B-G-003-07