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Page 10 Epson Research and Development
Vancouver Design Center
S1D13708 Connecting to the Sharp HR-TFT Panels
X39A-G-011-01 Issue Date: 01/11/25
2.1.4 AC Gate Driver Power Supplies
The gate drive low level power supply (V
EE
) is an AC power supply with a DC offset
voltage (offset typically -9.0V). The AC component is the common electrode driving signal
(V
COM
) which has a voltage of ±2.5V. V
COM
must be alternated every horizontal period
and every vertical period. The S1D13708 output signal REV accomplishes this function
and generates the alternating V
COM
signal which is superimposed onto V
EE
. Figure 2-3:
“Panel Gate Driver AC Power Supplies,” on page 10 shows the schematic for generating
V
COM
and V
EE
.
Figure 2-3: Panel Gate Driver AC Power Supplies
REV
VSS
VCOM
VEE
+5V
R2
15K 5%
R3
22 5%
R4
27K 5%
+
C1
22uF 16V
U1A
74ACT04
12
Q1
NPN
1
2 3
Q2
PNP
1
23
VR1
100K
1 3
2
+
C2
22uF 16V
R6
22 5%
R5
12K 5%
R7
120K 5%
R1
180
U2
F2C02E
1
2
3
4
5
6
7
8
N-S
N-G
P-S
P-G
N-D1
N-D2
P-D1
P-D2
C3
0.1uF