Introduction

The ST7781 is a single-chip controller/driver for 262K-color, graphic type TFT-LCD. It consists of 720 source line and 320 gate line driving circuits. This chip is capable of connecting directly to an external microprocessor, and accepts, 8-bits/9-bits/16-bits/18-bits parallel interface. Display data can be stored in the on-chip display data RAM of 240x320x18 bits. It can perform display data RAM read/write operation with no external operation clock to minimize power consumption. In addition, because of the integrated power supply circuit necessary to drive liquid crystal; it is possible to make a display system with the fewest components.

Features

◆ Driver Output:

- 720ch Source Outputs (240 X RGB)

- 320ch Gate Outputs

- Common Electrode Output

◆ Single Chip Display RAM:

-Capacity: 240x320x18 bit

◆ Support Display Color

- 65K Color

- 262K Color

- 8-color (Idle Mode)

◆ Supported LC Type Option

- MVA LC Type

- Transflective LC Type

- Transmissive LC Type

◆ Supported MCU Interface

- 8/9/16/18-bit Interface with 8080-Series MCU

- 3-line serial interface

◆ Display Features

- Partial Display Mode

- Resizing Function (x1/2, x1/4)

◆ Build-in Circuit

- DC/DC Converter

- Adjustable VCOM Generation

- Oscillator for Display Clock Generation

- Timing Controller

- Non-volatile Memory for Factory Default Value

- Line Inversion, Frame Inversion

◆ Non-Volatile Memory

- 7-bits for ID Code

- 5-bits for VCOM Adjustment

◆ Supply Voltage Range

- Analog Supply Voltage (VDD) Range: 2.5V to 3.3V

- I/O Supply Voltage (VDDI) Range: 1.65V to 3.3V

◆ Output Voltage Level

- GVDD – AGND: 3V to (AVDD-0.5) V

- AVDD – AGND: 4.5V to 5.6V

- VCL – AGND: -2.0V to -3.0V

- VCOMH – AGND: 3.0V to (AVDD-0.5) V

- VCOML – AGND: (VCL+0.5) V to 0.0V

- VGH – AGND: 10V to 16.5V

- VGL – AGND: -5V to -14V

◆ Lower Power Consumption

- CMOS Compatible Inputs

- Optimized Layout for COG Assembly

- Operate Temperature Range: -30 ℃ ~ +85℃