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Page 8 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 Connecting to the Sharp LQ039Q2DS01 HR-TFT
2.1 External Power Supplies
The S1D13708 provides all necessary data and control signals to connect to the Sharp
LQ039Q2DS01 320 x 240 HR-TFT panel. However, it does not provide any of the voltages
required for gray scaling, gate driving, or for the digital and analog supplies. Therefore,
external supplies must be designed for any device utilizing the LQ039Q2DS01.
2.1.1 Gray Scale Voltages for Gamma Correction
The standard gray scale voltages can be generated using a precise resistor divider network
that supplies two sets (A and B) of nine reference voltages to a National Semiconductor
9-Channel Buffer Amplifier (LMC6009). The LMC6009 buffers these nine reference
voltages and outputs them to the panel column drivers. The A/B inputs allow the two sets
of reference voltages to be alternated, compensating for asymmetrical gamma character-
istics during row inversion. This input is controlled by the S1D13708 output signal REV
which toggles every time a horizontal sync signal is sent to the panel.
The REV signal is also used to generate the highest gray scale voltage (V0 or black) by
buffering REV and shifting its maximum level to the maximum gray scale voltage
(CON_POWER). CON_POWER is supplied by a National Semiconductor micropower
Voltage Regulator (LP2951). Figure 2-1: “Sharp LQ039Q2DS01 Gray Scale Voltage (V0-
V9) Generation” shows the schematic for gray scale voltage generation.
Figure 2-1: Sharp LQ039Q2DS01 Gray Scale Voltage (V0-V9) Generation
A4B
A7B
A6A
V9
V3
A1B
A3B
A8B
A1B
V4
V2
A2B
A7A
V[9:1]A9A
A6A
A6B
A5A
A9B
A8B A4B
V8
V7
V1
A8A
A3B
A2A
A9A
A6B
A5B
A4A
A4A
A2A
A1A
V6
A7A
A1A
A2BA9B
A5B
A7B
V5
A3AA5A
A8A
A3A
V0
CON_POWER
V[9:1]
CON_POWER
V0
CON_POWER
REV
+5V
+5V
R37
11.8K 1%
R38
5.38K 1%
R11
14.3K 1%
R12
22.6K 1%
R13 28.7K 1%
R14
34.0K 1%
R15
42.2K 1%
R16
52.3K 1%
R17
75.0K 1%
R18
93.1K 1%
C3
0.1uF
L1
0.1uH
+
C2
220uF 25V
R1
47.5K 1%
R2
47.5K 1%
R3
47.5K 1%
R4 47.5K 1%
R5
47.5K 1%
R6
47.5K 1%
R7
47.5K 1%
R8
47.5K 1%
R9
47.5K 1%
U1
LMC6009
1
2
3
22
23
24
25
26
27
28
45
46
47
48
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42
41
40
39
36
35
34
33
32
29
43
37
31
44
38
30
NC1
NC2
NC3
NC4
NC5
NC6
NC7
NC8
NC9
NC10
NC11
NC12
NC13
NC14
A1A
A1B
A2A
A2B
A3A
A3B
A4A
A4B
A5A
A5B
A6A
A6B
A7A
A7B
A8A
A8B
A9A
A9B
OUT_A1
OUT_A2
OUT_A3
OUT_A4
OUT_A5
OUT_A6
OUT_A7
OUT_A8
OUT_A9
AB_Switch
GNDA
GNDB
GNDC
VCC1
VCC2
VCC3
C1
0.1uF
R10
6.04K 1%
U2
LP2951
1
2
3
45
6
7
8
OUTPUT
SENSE
SHTDWN
GNDERROR
VTAP
FEEDBACK
VIN
R28178K 1%
R19
47.5K 1%
R29
90.9K 1%
R20
47.5K 1%
R30
53.6K 1%
R3141.1K 1%
R32
33.2K 1%
R21
47.5K 1%
R39
180
R3325.3K 1%
R22
47.5K 1%
U4
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
R3419.6K 1%
R23
47.5K 1%
R35
11.8K 1%
R24
47.5K 1%
R25
47.5K 1%
R36
5.36K 1%
U3B
74ACT04
34
U3A
74ACT04
12
R26
47.5K 1%
R27
47.5K 1%