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HCD66774BP

更新时间： 2024-11-09 19:33:27

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HCD66774BP 数据手册

HD66774

Rev. 1.0 July 2002

HD66774

240-Channel Gate Driver for Color-TFT Liquid Crystal

Displays

Rev.1.0

July 2002

Description

HD66774 is a gate-driver IC for 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

only an external capacitor.

When used with the HD66770 396-channel source driver with on-chip RAM, and used with the

HD66772 528-channel source driver with on-chip RAM, this LSI is suitable for color TFT displays

of cellular phones having 132-by-176 and 176-by-240 dots, respectively.

Features

TFT gate-line driving circuits

¾ 240 outputs

Gate-line scanning

¾ Centering-screen function (vertically separated, comb type)

Internal power-supply circuit

¾ Step-up circuit: five to nine times, positive-polarity inversion

¾ Structure of TFT-display retention capacitor: Cst or Cadd

Alternating functions for TFT-display counter-electrode power supply

¾ N-line alternating drive of Vcom (Vgoff is also available for N-line alternating drive for

Cadd)

¾ Adjustment of Vcom (Vgoff) amplitude: internal 22-level digital potentiometer

Output power-supply voltage

¾ For the source driver: DDVDH - GND = 4.5 to 5.5 V (power supply for HD66770/772

liquid crystal output circuits), VDH - GND = 3.0 to DDVDH-0.5V (reference power supply

for HD66770/772 grayscale voltages)

12 3 4 5 6 7...53

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