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4 bpp gray shade

When the S1D13705 is configured for 4 bpp gray shade mode the displayed colors are selected from the green values of the first sixteen entries of the Look-Up Table. Each of the sixteen entries can be set to any of the sixteen possible intensity levels.

Each byte in the display buffer contains two adjacent pixels. If a nibble pattern is “0000” then the green intensity of LUT index 0 is displayed. A nibble value of “0001” results in the green intensity in LUT index 1 being displayed. The pattern continues to the nibble pattern of “1111” which results in the sixteenth intensity of Look-Up Table being displayed.

The following table shows the example values for 4 bit-per-pixel display mode.

Table 4-7: Suggested LUT Values for 4 Bpp Gray Shade

Index

Red

Green

Blue

 

 

 

 

00

00

00

00

01

00

10

00

02

00

20

00

03

00

30

00

04

00

40

00

05

00

50

00

06

00

60

00

07

00

70

00

08

00

80

00

09

00

90

00

0A

00

A0

00

0B

00

B0

00

0C

00

C0

00

0D

00

D0

00

0E

00

E0

00

0F

00

F0

00

10

00

00

00

...

00

00

00

FF

00

00

00

 

 

 

 

indicates unused entries

S1D13705

Programming Notes and Examples

X27A-G-002-03

Issue Date: 02/01/22

Page 118
Image 118
Epson S1D13705 technical manual Suggested LUT Values for 4 Bpp Gray Shade