Connecting To The Sharp Lq039Q2Ds01 Hr-Tft; External Power Supplies; Gray Scale Voltages For Gamma Correction - Epson S1D13706 Technical Manual

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2 Connecting to the Sharp LQ039Q2DS01 HR-TFT

Figure 2-1: Sharp LQ039Q2DS01 Gray Scale Voltage (V0-V9) Generation

X31B-G-011-04

The S1D13706 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.

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 S1D13706 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.

Epson Research and Development

Vancouver Design Center

Connecting to the Sharp HR-TFT Panels

Issue Date: 01/02/23

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