L4042B1J000S Seiko Instruments, Inc., L4042B1J000S Datasheet - Page 9

• Manufacturer Part Number: L4042B1J000S
• Description: LCM: Liquid Crystal Display Modules
• Manufacturer: Seiko Instruments, Inc.

Liquid Crystal Display Modules
STRUCTURE AND FEATURE OF LCD MODULE WITH BACKLIGHT
REFLECTIVE/TRANSFLECTIVE/TRANSMISSIVE LCD
TN TYPE/STN TYPE/FSTN TYPE
TN
STN
FSTN
Reflector bonded to the rear polarizer
reflects the incoming ambient light. Low power
consumption because no backlight is required.
POSITIVE/NEGATIVE MODE
POWER SUPPLY
CFL (Cold Cathode Fluorescent Lamp) backlight
Features: high brightness, long service life, inverter required
Character modules (single power supply)
Reflective LCD
Character Modules(Dual power supply)
Backlight type
Edge backlight type
Positive
(G2446,G242C)
(G321D,G649D)
type
LCD module
LCD module
V
LC
V
(Background/dot color)
Yellowgreen/Dark blue
LC
V
V
SS
SS
Gray/Dark blue
V
V
reflected
light
source
White/Black
DD
Gray/Black
DD
White/Blue
VR
light
Frame
VR
reflector
Frame
GND
+ 5V
GND
+ 5V
- 2V (min)
PCB
TN( Twisted Nematic) type is most conventional and economical. It is used for static drive LCD and
low-duty drive LCD ( watch,calculator, etc.)
STN (Super Twisted Nematic) type has a higher twist angle, and thus provides clear visibility
and wider viewing angle. This is suitable especially for high-duty drive LCD.
FSTN (Film Super Twisted Nematic) type utilizes RCF (Retardation Control Film) to remove
the coloring of STN LCD. Thus FSTN type provides easy-to-read black-and-white display.
Light guide
LCD
CFL
G2446,G242C (Built-in DC-DC conv.)
Transflector bonded to the rear polarizer re-
flects light from the front as well as enabling
lights to pass through the back. Used with
backlight off in bright light and with it on in low
light to reduce power consumption.
Y1206 and G1226
Transflective LCD
LCD
PCB
*
Negative voltage should be variable for
contrast adjustment.
reflected light
LCD module
LCD module
transmitted
light
source
V
V
Negative
LC
V
SS
light
V
SS
type
V
DD
DD
PCB
transflector
light source
(backlight)
CFL
GND
+ 5V
GND
+ 5V
Negative
voltage
*
EL (Electroluminescent Lamp) backlight
LED (Light Emitting Diode) backlight
G321D, G324E and G649D
Features: EL: thin, inverter required
Without reflector or transflector bonded to the
rear polarizer. Backlight required. Most com-
mon is transmissive negative image.
Note 1:Contrast can be adjusted by VR.
Note 2:For module with backlight, power supply
Transmissive LCD
(when data is inverted)
Frame
(inverse image)
for backlight is necessary.
LED: long service life, low voltage
Negative type
transmitted
LCD module
PCB
V
LC
driving, no inverter required
V
light
0
V
SS
V
DD
VR
R
R
1
2
LCD
light source
(backlight)
GND
EL or LED
+ 5V
Negative
voltage
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