Overview
The LC74736PT is an on-screen display CMOS IC that displays characters and patterns on a TV screen under the control of a microcontroller.
For QVGA display, the LC74736PT supports the use of both a 16 × 16 dot character font and a 16 × 16 dot graphic font with 16 colors.
For WVGA display, the LC74736PT supports the use of both a 24 × 32 dot character font and a 24 × 32 dot graphic font with 16 colors.
The LC74736PT can also implement extremely varied displays by the use of an external ROM.
The LC74736PT supports both QVGA (480×234) and WVGA (800×480).

Features
(1) Screen structure
   Main: 2 screens (1 screen for WVGA display)
      30 characters×15 lines (up to 450 characters) on a QVGA panel
      33 characters×15 lines (up to 495 characters) on a WVGA panel
      (Up to 34 characters×18 lines)
   Wallpaper display screen:
      QVGA mode: maximum Permanent repetition of a 4×4 (horizontal×vertical) character pattern
      WVGA mode: maximum Permanent repetition of a 2×2 (horizontal×vertical) character pattern
(2) Character structure
   QVGA mode: About 9MHz
      16 dots (horizontal) ×16 dots (vertical): Character display
      16 dots (horizontal) ×16 dots (vertical): Graphic glyph display
   WVGA mode: About 33.2MHz
      24 dots (horizontal) ×32 dots (vertical): Character display
      24 dots (horizontal) ×32 dots (vertical): Graphic glyph display
   Character display clock:
      LC oscillator (about 10MHz)
      External clock signal input (up to 40MHz)
      Built-in PLL (VCO) (7 to 40MHz)
(3) Number of characters
   QVGA mode
      Up to 16384 characters when an external 16-bit 16M ROM is used.
   WVGA mode
      Up to 4096 characters when an external 16-bit 16M ROM is used.
         No internal ROM
         Internal character RAM QVGA: 4 characters, WVGA: 1 character
(4) Character sizes: Four horizontal sizes (1×, 2×, 3×, and 4×)
                         Four vertical sizes (1×, 2×, 3×, and 4×)
                         (The character size is specified in line units.)
(5) Display start positions: 1024 positions in the horizontal direction and 512 positions in the vertical direction.
   Setting units: Horizontal: 1 dot (in screen units)
                     Vertical: 1 dot (in screen units)
(6) Display functions
   • Blinking specification (in character units)
      Period: 1/64, 1/32, and 1/16 of the vertical sync signal (in screen units)
      Duty: Fixed at 50%
   • Box (raised or recessed) display
      Raised/recessed specification (in character units)
      Left: Off/on specification (in character units)
      Right: Off/on specification (in character units)
      Top: Off/on specification (in character units)
      Bottom: Off/on specification (in character units)
   • Border specification (in line units): Only valid with glyphs from the character font.
(7) Color specification
   Character
      • Character color (in character units): 1 of 16 colors can be specified.
      • Character background color (in character units): 1 of 16 colors can be specified.
      • Border color (in line units): 1 of 16 colors can be specified.
   Graphic
      • 16 types can be specified by ROM data
   Graphic 2
      • 16 types can be specified by ROM data
        1 color type can be changed.
   Graphic 3
      • 16 types can be specified by ROM data
        1 color table type can be changed.
      • Box (raised or recessed) color (line units): 1 of 16 colors can be specified.
      • Background color (screen units): 1 of 16 colors can be specified.
(8) Color table (palette)
   • Sixteen colors can be selected from a set of 4096 colors (One of which is specified to be transparent.)
   • Number of color tables: 4. This allows up to 64 colors to be displayed at the same time.
(9) Wallpaper screen (Graphics glyphs only)
   Wallpaper display: Repeated display under the main screen
      (up to 4 characters horizontally by 4 characters vertically).
   Sprite character display: Displayed above the main screen
      (up to 4 characters horizontally by 4 characters vertically).
(10) Line spacing control
   0-15 scan lines (in line units)
(11) Output
   Analog RGB output( to 20MHz)
   Digital RGB output (4 bits per color)
   BLK (OSD display period signal)