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| HX8609A 240 Channel TFT Gate Driver with Internal Power IC HX8609A 240 Channel TFT Gate Driver with Internal Power IC April 2003, Version 1.0 1. General Description HX8609A is a gate-driver IC for using in systems with color-TFT-liquid-crystal dot-matrix graphic displays. It incorporates a circuit for driving 240 channels of TFT gate-line driving and all the power-supply circuits that are required for liquid crystal displays, and realizes the liquid crystal display by adding external capacitors. When used with the HX8302A 396-channel source driver with internal RAM, and used with the HX8301A 528-channel source driver with internal RAM, this LSI is suitable for color TFT displays of cellular phones having 132-by-176 and 176-by-240 pixels, respectively. The LSI has functions such as instruction setting from source driver, internal step-up circuit, op-amp circuit, micro-adjustment of power output etc., and is suitable for midium-small potable machine such as mobile phone, small-size PDAs. 2. Features * TFT gate-line driving circuits 240 outputs * The driving timing suitable for configuration of TFT structure in display Cst structure (Cs-on-common TFT structure) * 2 Vcom output voltages : Vcom and Vcom2 which is alternating between VcomL , VcomH and VcomL2 , VcomH2. * Alternating driving for TFT-display common-electrode power supply N-line alternating drive of Vcom Adjustment of Vcom amplitude : internal 22-level digital potentiometer. Adjustment of Vcom high voltage : internal 30-level digital potentiometer / externally adjusted by variable resistor. * The instruction transfer for mode setting Serial transfer from the HX8301A/8302A source driver * Low-power consumption operation Controlling function for the switching performance of step-up circuits and operational amplifiers * Input power-supply voltage Vcc - GND = 1.8 ~ 3.3 V (Power supply for logic circuit) Vci - GND = 2.5 ~ 3.3 V (Power supply for analog circuit) Version 1.0 Himax Technologies, Inc. 1 HX8609A 240 Channel TFT Gate Driver with Internal Power IC * Power-supply voltage for liquid crystal(LC) driving DDVDH - GND = 4.0 ~ 5.5 (V) (Driving for source driver liquid crystal output circuit / Driving for Vcom output) VGH - GND = 9.0 ~ 16.5 (V) (Driving for gate driver) VGL - GND = -4.0~ -14.0 (V) (Driving for gate driver) VCL - GND = 0 ~ -3.3 (V) (Driving for VcomL , VcomL2 output) * Output voltage level VDH - GND = 3.0 ~ (DDVDH-0.5) (V) (Reference power supply for source driver grayscale voltages) Vcom(2) - GND (Using for common voltage level) VcomH(2) = 3.0 ~ (DDVDH-0.5) (V) (High-level common voltage in alternating driving) Vcom L(2) = VCL + 0.5 ~ 1.0 (V) (Low-level common voltage in alternating driving) Vcom(2) amplitude ( VcomH(2)-VcomL(2) ) = 6 (V) max. * Internal step-up circuit output DDVDH :VciOUT x 2 VGH :VciOUT x 6 VGL :VciOUT x -4 , -5 VCL :VciOUT x -1 3. Block Diagram G1 ~ G240 Gate-line Driving Circuit 240 Level Shifter 240 Scan Data Generation Circuit Serial Interface / Register Step-up Circuit LCD Driving-level Generation Circuit DISPTMG CL1 FLM Vcc GND VcomR VcomR2 VcomH VcomH2 C** DDVDH Figure 1. Block Diagram VcomL VcomL2 Vcom Vcom2 VciOUT DCCLK /RESET GCL GDA /GCS VGH VGL VCL M EQ VDH Vci Version 1.0 Himax Technologies, Inc. 2 |
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