Epson Research and Development

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Vancouver Design Center

 

 

 

2 bpp Gray Shade

In 2 bpp gray shade mode, the 16 LUT entries are divided into four separate banks, each having four entries:

Table 3-14: Recommended LUT Values for 2 bpp Gray Shades

Index

Look-Up Table

Data

(hex)

(hex)

 

 

 

00

00

 

 

01

05

 

 

02

0A

 

 

03

0F

 

 

4 bpp Gray Shade

In 4 bpp gray shade mode, the pixel value indexes into one of 16 LUT entries. The LUT bank bits are ignored in this mode. The recommendation for this mode is to program the register values to data values equalling the register number (i.e. G[0] = 0, G[1]=1, G[2]=2, ... G[F]=0Fh).

8 bpp Gray Shade

When the S1D13504 is configured for 8 bpp gray shade mode, bits [7:5] are ignored, bits [4:2] represent the green LUT index, and bits [1:0] are ignored. Only 3 bits of the 8 that actually represent any shade value, therefore the maximum gray shade combination is 8 shades. If this limitation is deemed appropriate for your application, it is recommended that the LUTs are programmed according to the following format: Red and Blue LUT entries are not important, Green LUT indexes

0-7 should be programmed 0-F as in the table below:

Table 3-15: Recommended LUT Values for 8 bpp Gray Shade

LUT Address

Green LUT Data

 

 

00

00

 

 

01

02

 

 

02

04

 

 

03

06

 

 

04

08

 

 

05

0A

 

 

06

0C

 

 

07

0F

 

 

This recommended LUT assumes that you are using only bank 0.

Programming Notes and Examples

S1D13504

Issue Date: 01/02/01

X19A-G-002-07

Page 159
Image 159
Epson S1D13504 manual Recommended LUT Values for 2 bpp Gray Shades, Recommended LUT Values for 8 bpp Gray Shade