Raydium Semiconductor Corporation

Single Chip Driver with 16.7M color for 480RGBx864 a-Si TFT LCD.

Description (from datasheet)

RM68120 is a 16.7 million-color single-chip SoC driver for a-si TFT LCD driver IC that supply resolution of 480RGBx360, 480RGBx640, 480RGBx720, 480RGBx800, 480RGBx854, 480RGBx864 with internal GRAM and 480RGB x 1024 by pass internal GRAM. RM68120 comprise a 1440-channel source driver, gate control timing by level shift, 1,244,160 bytes GRAM for graphic data of 480RGBx864 dots, and power supply circuit.

The RM68120 supports 24-/16-/8-bit data bus interface, I2C interface and serial peripheral interfaces (SPI). It also supplies 24bit, 18-bit or 16-bit RGB interface, MDDI interface and MIPI interface for driving video signal directly from application controller. The moving picture area can be specified in internal GRAM by window address function. The specified window area can be updated selectively, so that moving picture can be displayed simultaneously independent of still picture area.

RM68120 can operate with 1.65V I/O interface voltage, and an incorporated voltage follower circuit to generate voltage levels for driving a TFT LCD panel. The RM68120 also supports a function to display in 8 colors and a sleep mode, allowing for precise power control by software and these features make the RM68120 an ideal driver for portable products such as digital cellular phones, smart phone, MP3 and PMP where long battery life is a major concern.

Features (from datasheet)

  • A single-chip controller driver for a WVGA panel type a-si TFT LCD display
  • Display resolution option
    1. With GRAM:
      1. 480RGB x 360
      2. 480RGB x 640
      3. 480RGB x 720
      4. 480RGB x 800
      5. 480RGB x 854
      6. 480RGB x 864
    2. By pass GRAM:
      1. 480RGB x 1024
  • RAM size: 480 x 3 x 864 = 1,244,160 bytes
  • System interface
    1. 8-, 16-, 24-bits 80-series MPU interface
    2. 16-bits serial peripheral interface
    3. I2C interface
  • Moving picture display interface
    1. 16-, 18-, 24-bit RGB interface (SYNC and DE mode)
  • High speed interface
    1. Mobile Display Digital Interface (MDDI V1.2, 1 clock and 1 or 2 data lane pairs)
    2. MIPI Display Serial Interface (DSI V1.01 r11 and D-PHY V1.0, 1 clock and 1 or 2 data lane pairs)
  • Display color mode
    1. Full color mode: 16.7M colors
    2. Reduce color mode:
      1. 262k colors
      2. 65k colors
      3. 8 colors (Idle mode)
  • Window address function to specify a rectangular area writing data in the internal RAM
  • Abundant color display and drawing functions
    1. Programmable γ-correction function for 16.7 million color display
    2. Individual gamma correction setting for RGB dots
    3. Partial display function
  • Low power consumption architecture
    1. Deep standby mode
    2. Sleep mode
    3. 8-color display function
  • Power supply startup sequencer
  • Support 1-, 2-, 3-, 4-dot, column and zigzag inversion
  • Four GPO pins for external control
  • On chip checksums check
  • Operating temperate: -30℃ ~ 70℃
  • On module DC/DC converter
    1. DDVDH=4.5V to 6.5V
    2. DDVDL=-4.5V to -6.5V
    3. VCL=-2.5V to -4.0V
    4. Positive gamma high voltage level: VGMP=3.5V to 5V
    5. Positive gamma low voltage level: VGSP=0.0V, 0.3V to 3.7V
    6. Negative gamma high voltage level: VGMN=-5V to -3.5V
    7. Negative gamma low voltage level: VGSN=0.0V, -0.3V to -3.7V
    8. Positive gate driver output voltage level: VGH=+8V to +18V
    9. Negative gate driver output voltage level: VGL=-2V to -15V
    10. VCOM=-3.5V to 0V
  • Input power supply voltages:
    1. IOVCC (VDDI) = 1.65V~3.3V
    2. IOVCCL (VDDIL) = 1.1V~1.3V

See datasheet: RM68120.pdf