參數(shù)資料
型號： L4042
廠商： Electronic Theatre Controls, Inc.
英文描述： Liquid Crystal Display Modules
中文描述： 液晶顯示模塊
文件頁數(shù)： 9/11頁
文件大?。?/td> 928K
代理商： L4042
8
Liquid Crystal Display Modules
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
Transmissive LCD
Without reflector or transflector bonded to the
rear polarizer. Backlight required. Most com-
mon is transmissive negative image.
EL (Electroluminescent Lamp) backlight
LED (Light Emitting Diode) backlight
Features: EL: thin, inverter required
LED: long service life, low voltage
driving, no inverter required
REFLECTIVE/TRANSFLECTIVE/TRANSMISSIVE LCD
POSITIVE/NEGATIVE MODE
TN TYPE/STN TYPE/FSTN TYPE
STRUCTURE AND FEATURE OF LCD MODULE WITH BACKLIGHT
CFL (Cold Cathode Fluorescent Lamp) backlight
Features: high brightness, long service life, inverter required
POWER SUPPLY
Reflective LCD
Reflector bonded to the rear polarizer
reflects the incoming ambient light. Low power
consumption because no backlight is required.
Edge backlight type
(G2446,G242C)
(G321D,G649D)
Backlight type
Frame
LCD
CFL
PCB
Light guide
PCB
PCB
CFL
LCD
LCD
PCB
EL or LED
Frame
Frame
LCD module
V
DD
V
LC
V
SS
VR
GND
+ 5V
V
DD
V
LC
V
SS
GND
Negative
voltage
+ 5V
*
V
DD
V
LC
V
SS
VR
GND
+ 5V
-
2
V
(min)
V
DD
V
LC
V
SS
VR
GND
+ 5V
R
1
R
2
V
0
V
DD
V
SS
GND
+ 5V
Character modules (single power supply)
LCD module
LCD module
LCD module
LCD module
Negative
voltage
G24
4
6
,G242C
(Built-in DC-
D
C conv
.
)
G321D, G324E and
G649D
Character Modules(Dual power supply) Y1206 and G1226
Negative voltage should be variable for
contrast adjustment.
Note 1:Contrast can be adjusted by VR.
Note 2:For module with backlight, power supply
for backlight is necessary.
light
source
reflected
light
reflector
transmitted
light
transflector
reflected light
light source
(backlight)
light source
(backlight)
transmitted
light
Positive
type
Negative
type
Negative type
(inverse image)
(when data is inverted)
TN
STN
FSTN
(Background/dot color)
Gray/Black
White/Black
Yellowgreen/Dark blue
Gray/Dark blue
White/Blue
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.
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