LC7940YD Datasheet, PDF (11/11 Pages) Sanyo Semicon Device – Dot-matrix LCD Drivers

LC7940YD, LC7941YD
Segment Data Not Multiples of 4
Example.
LCD panel (100 × 230 pixels)
01 080
LC7940YD
#1
---
01 080
LC7940YD
#2
---
01 080
LC7940YD
#3
LOAD
SDI
m,1
m,2 ---
,228 m,229 m,230 m+1,1 m+1,2
,228 m+1,229 m+1,230
If this timing data is sent, data elements (m, 229), (m,
230), (m+1, 229), (m+1. 230)... will not appear in the
output (O69 and O70 on chip 3). This is because the
LC7940YD (or LC7941YD) converts serial/parallel data
in 4–bit units, which also decreases power dissipation . For
data that is not a multiple of 4, like 230, the following
scheme is used.
LOAD
SDI
m,1
m,2 ---
,228 m,229 m,230 m,231 m,232
Vaild display data
Dummy data
Multiple of 4
In this case, (m, 231) is output on O71 on chip 3, and (m, connected to the panel and are, therefore, invalid.
232) on O72 on chip 3. However, these outputs are not
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This catalog provides information as of June, 1999. Specifications and information herein are subject to
change without notice.
No. 6158—11/11