SOLOMON
Rev 1.4
01/2003
SSD1882
10
8 FUNCTIONAL BLOCK DESCRIPTIONS
8.1 Controller and Data Register
Based on the input signal of FR, F1, F2 and LP, this Controller will generate signals to control
the Data Register. Then, the Data Register will latch the data to the Common Cell Level
Shifter according to the signals from the Controller and the data from the Shift Register. The
data is latched to the Common Cell Level Shifter at the falling edge of LP.
8.2 Bi-directional Shift Register
This Shift Register shifts the input signals YD and CIO input according to the setting of SHL,
SEL, LSEL and CSEL. When SHL is set at “L” level, CIO1 is input and CIO2 is output. When
SHL is set at “H” level, CIO1 is output and CIO2 is input. The output transition occurs on the
falling edge of LP.
8.3 Common Cell Level Shifter
This is a level interface circuit which converts the signal voltage level from a logic system
level to the LCD driver system voltage level. When DOFF# is at “L” level, all common output
voltage will be at VC level. When DOFF# is at “H” level, the common output voltage will be
changed according to the status of input signals of FR, F1 and F2. Table 5 and Table 6 show
the relationship between the common output voltage values and the input signals FR, F1 and
F2.
Table 4 - Relationship between COM voltage and F1 & F2 when FR = L
When DOFF# = H and FR = L
F1 1 0 1 0
F2 1 1 0 0
line r +V1 +V1 -V1 +V1
line (r + 1) -V1 +V1 +V1 +V1
line (r + 2) +V1 -V1 +V1 +V1
line (r + 3) +V1 +V1 +V1 -V1
Table 5 - Relationship between COM voltage and F1 & F2 when FR = H
When DOFF# = H and FR = H
F1 1 0 1 0
F2 1 1 0 0
line r -V1 -V1 +V1 -V1
line (r + 1) +V1 -V1 -V1 -V1
line (r + 2) -V1 +V1 -V1 -V1
line (r + 3) -V1 -V1 -V1 +V1
Table 6 - Relationship between Line# and Common
Line# Formula Common
r Multiples of 4 0, 4, 8, 12, ... , 228, 232, 236
r + 1 1 + multiples of 4 1, 5, 9, 13, ... , 229, 233, 237
r + 2 2 + multiples of 4 2, 6, 10, 14, ... , 230, 234, 238
r + 3 3 + multiples of 4 3, 7, 11, 15, ... , 231, 235, 239