
Epson Research and Development
Page 13
Vancouver Design Center
Connecting to the Epson D-TFD Panels
S1D13706
Issue Date: 01/02/23
X31B-G-012-03
2.5 Level Shift and Clamp Circuit for Vertical Logic Control Signals
The vertical system power supplies are swung between positive and negative values.
However, the vertical control signals from the S1D13706 are between GND and VCC.
Signals going to the panel must be level shifted to the swinging power supply levels. The
transition from high to low, and low to high for these control signals must take place at the
same time that the swing power supply switches states. Figure 2-6: “Logic for Vertical
Control Signals” shows the circuitry required for the vertical control signals. The control
signals on the left are outputs from the S1D13706 and the derived control signals on the
right are connected to the LCD panel.
Figure 2-6: Logic for Vertical Control Signals
V5Y
VCCY
VCCY
VCCY
V5Y
V5Y
VCCY
V5Y
V5Y
V5Y
VCCY
VCCY
DY
XINH
YSCLD
YSCL
FR
L_FR
L_YSCL
L_XINH
L_DY
R4
100
D1
1SS388
U1B
TC7W04FU
6
2
D2
1SS355
R1
100
C1
220p 50V
D3
1SS355
U1A
TC7W04FU
1
7
R7
4.7K
U1A
74AC32/SO
1
2
3
R6
4.7K
R3
100
C3
220p 50V
C2
220p 50V
R2
100
R8
100
C4
220p 50V
U1B
74AC32/SO
4
5
6
R9
4.7K
U1C
74AC32/SO
9
10
8
R5
2.7K