Overview

The LC74781 and LC74781M are on-screen display CMOS LSIs that display characters and patterns on a TV screen under microprocessor control. The LC74781 and LC74781M display up to 12 lines of 24 characters, each in a 12 × 18 dot matrix.

Features

• Display structure: 12 lines × 24 characters (up to 288 characters)

• Character structure: 12 (horizontal) × 18 (vertical) dots

• Character sizes: Three size settings each in the vertical and horizontal directions

• Character set: 128 characters

• Display start position: 64 position settings each in the vertical and horizontal directions

• Blinking: In individual character units

• Blinking types: Two types with periods of about 0.5 and 1.0 second

• Blanking: Whole font area blanking (12 × 18 dots)

• Background colors: 8 colors (in internal synchronization mode): 4fSC (NTSC/PAL/PAL-M/PAL-N)

Background colors: 4 colors (in internal synchronization mode): 2fSC (NTSC)

Background colors: 1 color (blue) (in internal synchronization mode): 2fSC (PAL/PAL-M/PAL-N)

• External control input: 8-bit serial input format

• Built-in sync separator circuit

• Character blanked data output

• Video output: Compound NTSC, PAL, PAL-N and PAL-M output