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M40249DWS View Datasheet(PDF) - Unspecified

Part NameDescriptionManufacturer
M40249DWS Liquid Crystal Display Modules ETC
Unspecified 
M40249DWS Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
Liquid Crystal Display Modules
REFLECTIVE/TRANSFLECTIVE/TRANSMISSIVE LCD
Reflective LCD
Reflector bonded to the rear polarizer
reflects the incoming ambient light. Low power
consumption because no backlight is required.
light
source
reflected
light
reflector
Transflective LCD
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.
light
source
light source
(backlight)
reflected light
transmitted
light
transflector
Transmissive LCD
Without reflector or transflector bonded to the
rear polarizer. Backlight required. Most com-
mon is transmissive negative image.
transmitted
light
light source
(backlight)
POSITIVE/NEGATIVE MODE
Positive
type
Negative
type
Negative type
(inverse image)
(when data is inverted)
TN TYPE/STN TYPE/FSTN TYPE
TN
STN
FSTN
(Background/dot color)
Gray / Black
Yellowgreen/Dark blue
Gray/Dark blue
White /Blue
White / Black
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.
STRUCTURE AND FEATURE OF LCD MODULE WITH BACKLIGHT
CFL (Cold Cathode Fluorescent Lamp) backlight
Features: high brightness, long service life, inverter required
EL (Electroluminescent Lamp) backlight
LED (Light Emitting Diode) backlight
Edge backlight type
(G2446,G242C)
(G321D,G649D) Frame
LCD
Features: EL: thin, inverter required
LED: long service life, low voltage
CFL
driving, no inverter required
Light guide
PCB
Backlight type
Frame
LCD
Frame
PCB
LCD
EL or LED
PCB
CFL
PCB
POWER SUPPLY
Character modules (single power supply)
LCD module
VDD
VLC
VSS
+ 5V
VR
GND
Character Modules(Dual power supply)
LCD module
VDD
VSS
VLC VR
+ 5V
GND
- 2V (min)
G2446,G242C (Built-in DC-DC conv.) G321D, G324E and G649D
LCD module
VDD
VSS
Y1206 and G1226
+ 5V
GND
LCD module
VDD
R1
VSS
V0
VR
+ 5V
GND
LCD module
VDD
VSS
VLC
+ 5V
GND
Negative
voltage *
R2
VLC
Negative
voltage
Note 1:Contrast can be adjusted by VR.
Note 2:For module with backlight, power supply
for backlight is necessary.
* Negative voltage should be variable for
contrast adjustment.
8
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