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Page 14
3 Connecting to the Sharp LQ031B1DDxx HR-TFT
3.1 External Power Supplies
3.1.1 Gray Scale Voltages for Gamma Correction
REV
Figure 3-1: Sharp LQ031B1DDxx Gray Scale Voltage (V0-V9) Generation
S1D13706
X31B-G-011-04
The S1D13706 provides all necessary data and control signals to connect to the Sharp
LQ031B1DDxx 160x160 HR-TFT panel(s). However, it does not provide any of the
voltages required for the backlight, gray scaling, gate driving, or for the digital and analog
supplies. Therefore, external supplies must be designed for any device utilizing the
LQ031B1DDxx.
The LQ031B1DDxx (160x160) has the same voltage requirements as the LQ039Q2DS01
(320x240). All the circuits used to generate the various voltages for the LQ039Q2DS01
panel also apply to the LQ031B1DDxx panel. This section provides additional circuits for
generating some of these voltages.
The standard gray scale voltages can be generated using a precise resistor divider network
as described in Section 2.1.1, "Gray Scale Voltages for Gamma Correction" on page 8.
Alternately, they can be generated using a Sharp gray scale IC. The Sharp IR3E203 elimi-
nates the large resistor network used to provide the 10 gray scale voltages and combines
their function into a single IC.
The S1D13706 output signal REV is used to alternate the gray scale voltages and connects
to the SW input of the IR3E203 IC. The COM signal is used in generating the gate driver
panel AC voltage, V
COM
Supplies" on page 15. Figure 3-1: "Sharp LQ031B1DDxx Gray Scale Voltage (V0-V9)
Generation" shows the circuit that generates the gray scale voltages using the Sharp
IR3E203 IC.
C1
U1
4.7uF
16
SW
1
NC
17
NC
18
NC
10
GND
SHARP IR3E203
and is explained in Section 3.1.4, "AC Gate Driver Power
5V
C2
2.2uF
5
V0
V0
6
V1
V1
7
V2
V2
8
V3
V3
9
V4
V4
11
V5
V5
12
V6
V6
13
V7
V7
14
V8
V8
15
V9
V9
4
COM
Epson Research and Development
Vancouver Design Center
V[9:0]
COM
Connecting to the Sharp HR-TFT Panels
Issue Date: 01/02/23
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