Page 18
Epson Research and Development
Vancouver Design Center
When dithering is enabled (REG[041h) bit 1) the full color range is available on all display
types. If dithering is disabled the full color range is only available on TFT/D-TFD or CRT
displays. Passive LCD displays are limited to using the four most significant bits from each
4
4
4
of the red, green and blue portions of each color resulting in 4096 (2 × 2 × 2 ) possible
colors.
Should a monochrome panel be used at this color depth, the output sends the five bits of the
green LUT component to the modulator for a total of 32 possible gray shades. If dithering
is disabled, the maximum number of gray shades is 16.
3.5 Memory Organization for 16 Bpp (65536 Colors/64 Gray Shades)
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Bit 0
Red Component
Bits 4-0
Green Component
Bits 5-3
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Green Component
Bits 2-0
Blue Component
Bits 4-0
Figure 3-4: Pixel Storage for 16 Bpp in Two Bytes of Display Buffer
At a color depth of 16 bpp the S1D13506 is capable of displaying 65536 colors. The 65536
color pixel is divided into three parts: five bits for red, six bits for green, and five bits for
blue. In this mode the LUT is bypassed and output goes directly into the Frame Rate
Modulator.
When dithering is enabled (REG[041h) bit 1) the full color range is available on all display
types. If dithering is disabled the full color range is only available on TFT/D-TFD or CRT
displays. Passive LCD displays are limited to using the four most significant bits from each
4
4
4
of the red, green and blue portions of each color resulting in 4096 (2 × 2 × 2 ) possible
colors.
Should monochrome mode be chosen at this color depth, the output sends the six bits of the
green LUT component to the modulator for a total of 64 possible gray shades. If dithering
is disabled, the maximum number of gray shades is 16.
S1D13506
X25B-G-003-03
Programming Notes and Examples
Issue Date: 01/02/06
EPSON [ EPSON COMPANY ]
