HD66781 Datasheet, PDF (7/196 Pages) Renesas Technology Corp – 720-channel Source Driver for a-Si TFT/Low Temperature Poly-Si TFT Panels with 262,144-color display RAM

HD66781
Preliminary
Features
• Drive 262,144 TFT-color 240RGB x 320 dot graphics display in combination with HD66783 (a-Si
TFT panel) or HD667P21 (low-temperature poly-Si TFT panel)
• Output signals to control HD66783, which incorporates a power supply integrated circuit and a gate
driver on a single chip.
• Output signals to control a low-temperature poly-Si TFT panel with an incorporated gate driver
(combined use with HD667P21)
• System interface
– High-speed bus interface with 8-/9-/16-/18-bit data bus
– Serial Peripheral Interface (SPI)
• Interfaces for moving picture display
– RGB interface with 6-/16-/18-bit data bus (VSYNC, HSYNC, DOTCLK, ENABLE, PD17-0)
– VSYNC interface (System interface + VSYNC)
• High-speed burst RAM write function
• Compliant to single address mode for DMA transfer that controls data bus occupation ratio when
transferring data from external SRAM
• Window address function to write data to a rectangular area of RAM specified by the window address
– Interfaces for moving picture display, which write data to a rectangular RAM address area
– Reduce data transfer by transferring only the data for the moving picture display area
– Simultaneous display of moving picture area and still picture area that displays the contents of
internal RAM
– Resizing function (contraction rate: x1/2, x1/4 / magnification rate: x2, x4)
• Various functions to control color display
– Simultaneous availability of 262,144 colors (settings are programmable)
– Partial OSD function
– α-blending function (transmission rate: 0%, 25%, 50%, 75%, 100%)
• Features for low-power architecture
– Interface I/O power supply
IOVcc = 1.7 ~ 3.3 V
Vcc1 = 1.7 ~ 3.3 V
– Logic regulator power supply
Vcc = 2.5 ~ 3.3 V
– Source driver liquid crystal driving voltage DDVDH-GND = 4.0 ~ 5.9 V
– Power saving functions: standby mode, deep standby mode etc.
– Step-up circuits to generate liquid crystal drive voltage up to 12 times (HD66783 and HD667P21)
– Voltage followers for a liquid crystal drive power-supply, which fends off the direct current from
bleeder-resistors
• Cst structure only (Common Vcom formula)
• 224,640-byte (240 x (320+96) x 18bits) internal RAM
• Incorporated LCD driver with 720 source outputs
• Compliant to COG
Rev.0.5, July.31.2003, page 7 of 196