HD66789 Datasheet, PDF (6/156 Pages) Renesas Technology Corp – 528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit

HD66789
Preliminary
Features
• Liquid crystal controller/driver for 262,144 TFT-color 176RGB x 240-dot graphics display
• Single chip solution for a TFT display panel
• System interface
– 8-/9-/16-/18-bit high-speed bus interface
– Serial Peripheral Interface (SPI)
– 8-bit transmission x 3 times (262k/65k color modes)
• Interface for moving picture display
– 6-/16-/18-bit RGB interface (VSYNC, HSYNC, DOTCLK, ENABLE, PD17-0)
– VSYNC interface (System interface + VSYNC)
• High-speed burst RAM write function
• Window address function to write data to the rectangular area of RAM specified by the window
address
– Interface to facilitate moving picture display in an arbitrary area
– Reduce data transmission by transmitting only the data for the moving picture display area
– Simultaneous display of moving pictures and the contents of the internal RAM
• Bit unit operations for processing graphics
– Write data mask function by bit
• Functions for controlling abundant color displays
– Simultaneous availability of 262,144 colors with γ-correction function
– Line-unit vertical scrolling
• Low-power architecture: features for low-power operation
– Vcc = 2.4 ~ 3.3 V (internal logic power supply)
– IOVcc = 1.8 ~ 3.3 V (interface I/O power supply)
– Vci = 2.5 ~ 3.3 V (analogue power supply)
– DDVDH = 4.5 ~ 5.5 V (liquid-crystal drive voltage)
– Power saving function (standby mode etc.)
– Partial liquid crystal drive to display two screens at arbitrary positions
– Voltage followers for liquid crystal drive power circuit to fend off the direct current from bleeder-
resistors
• Step-up circuit generating liquid crystal drive voltage up to 6-time scale
• 95,040-byte internal RAM
• Incorporated liquid crystal display driver with 582 source outputs and 240 gate outputs
• n-raster-row liquid crystal AC drive, enabling polarity inversion by every arbitrary number of raster-
rows
• Internal oscillation and hardware reset
• Reversible direction of signals between RAM and source driver
• Exclusive for Cst structure
Rev.0.12, May 09 2003, page 6 of 156