Epson S1D13708 Manuel D’Utilisation

Page 188

Vancouver Design Center

S1D13708

Hardware Functional Specification

X39A-A-001-02

Issue Date: 02/03/07

The Ink Layer is enabled/disabled using REG[C9h] bit 0. When the Ink Layer Enable bit is 
set to 1, the display buffer is automatically configured for a foreground and background 
image as shown in Figure 14-1 Memory Mapping for Ink Layer.

The Ink Layer requires a transparent color to be set. This transparent color is stored in 
REG[C7h], REG[C8h] and the value from these registers is compared with the values in 
the foreground image during display refresh. If the pixel value matches the transparent 
color, the corresponding pixel from the background image is shown. If the pixel value does 
not match the transparent color, the foreground image is shown.

There are certain limitations when the Ink Layer is enabled.

• Available display buffer is only 40K byte. This limits the resolution and color depth of 

the display (e.g. 160x160 at 16 bpp is not possible).

00000h

13FFFh

0A000h

40K Byte
Display Buffer

40K Byte
Ink Layer

(background)

(foreground)

Transparent Color = FFh

(REG[C7h],REG[C8h])

Example:

Pixel Value = A0h

Pixel Value = 00h

Pixel Value = A0h

Compare first pixel in ink layer (A0h) with the first
display color (00h). Pixel values do not match
therefore pixel value from main display (00h) is used
for display refresh.

Compare second pixel in ink layer (A0h) with
display memory color (A0h). Pixel values do match
therefore pixel value from ink layer (A0h) is
used for display refresh.