LC74736PT-E

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)