HD66840/HD66841
LVIC/LVIC-II
(LCD Video Interface Controller)
Description
The HD66840/HD66841 LCD video interface controller (LVIC/LVIC-II) converts standard RGB
video signals for CRT display into LCD data. It
enable a CRT display system to be replaced by an
LCD system without any changes, and it also
enables software originally intended for CRT
display to control an LCD.
Since the LVIC/LVIC-II can control TFT-type
LCDs in addition to current TN-type or STN-type
LCDs, it can support 8-color display as well as
monochrome, 8-level gray-scale display. It can
program screen size and can control a large-panel
LCD of 720 × 512 dots.
The LVIC-II thanks to a gray-scale palette, any 8levels can be selected from 13 gray-scale levels,
depending on the LCD panel used.
Features
• Conversion of RGB video signals used for CRT
display into LCD data
— Monochrome display data
— 8-level gray-scale data
— 8-color display data
• Selectable LVIC/LVIC-II control method
— Pin programming method
— Internal register programming method (either
with MPU or ROM)
• Programmable screen size
— 640 or 720 dots (80 or 90 characters) wide
by 200, 350, 400, 480, 512, or 540 dots
(lines) high, using the pin programming
method
— 32 to 4048 dots (4 to 506 characters) wide
by 4 to 1024 dots (lines) high, using internal
register programming method
• Double-height display capability
• Generation of display timing signal (DISPTMG)
from horizontal synchronization (HSYNC) and
vertical synchronization (VSYNC) signals
• Control of TN-type, STN-type LCDs and TFTtype LCDs
• Internal PLL circuit capable of generating a
CRT display dot clock (DOTCLK) (external
charge pump, low pass filter (LPF), and voltage
controlled oscillator (VCO) required)
• Gray-scale level selection from gray-scale
palette HD66841 (LVIC-II) only
• Maximum operating frequency (dot clock for
CRT display)
— HD66840 (LVIC) 25 MHz
— HD66841 (LVIC-II) 30 MHz
• LCD driver interface
— 4-, 8-, or 12-bit (4 bits each for R, G, and B)
parallel data transfer
• Recommended LCD drivers
— HD66204, HD66214T, HD66224T and
HD66110ST (column)
— HD66205, HD66205T, HD66215T and
HD66115T (common)
— HD66106 and HD66107T (column/common)
• 1.3 µm CMOS process
• Single power supply
— +5 V ±10%
