Memory Organization For Two Bit-Per-Pixel (4 Colors/Gray Shades); Memory Organization For Four Bit-Per-Pixel (16 Colors/Gray Shades) - Epson S1D13706 Technical Manual

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3.3 Memory Organization for Two Bit-per-pixel (4 Colors/Gray Shades)

Programming Notes and Examples

Issue Date: 01/02/23

Figure 3-2: Pixel Storage for 2 Bpp in One Byte of Display Buffer

At a color depth of 2 bpp, each byte of display buffer contains four adjacent pixels. Setting

or resetting any pixel requires reading the entire byte, masking out the unchanged bits and

setting the appropriate bits to 1.

Two bit pixels provide 4 gray shades/color possibilities. For monochrome panels the gray

shades are generated by indexing into the first 4 elements of the green component of the

Look-Up Table (LUT). For color panels the 4 colors are derived by indexing into the first

4 positions of the LUT.

Figure 3-3: Pixel Storage for 4 Bpp in One Byte of Display Buffer

At a color depth of 4 bpp, each byte of display buffer contains two adjacent pixels. Setting

or resetting any pixel requires reading the entire byte, masking out the upper or lower nibble

(4 bits) and setting the appropriate bits to 1.

Four bit pixels provide 16 gray shades/color possibilities. For monochrome panels the gray

shades are generated by indexing into the first 16 elements of the green component of the

Look-Up Table (LUT). For color panels the 16 colors are derived by indexing into the first

16 positions of the LUT.

X31B-G-003-03

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