REVISIONS
REV DESCRIPTION DATE APPROVED
These drawings and specifications are
the property of Densitron Corporation
and may not be reproduced, copied or
used without written permission
APPROVALS DATE
DRAWN
CHECKED
ISSUED
Unless otherwise
specified:
Dimensi ons are mm
Tolerances are:
X = ± 3
.X = ± 0.5
.XX = ± 0.05
DENSITRON CORPORATION
TORRANCE
,
CA
TITLE
SHEET 1 OF 8
DWG. NO. LM4045
4 LINE X 20 CHARACTERS LCD MODULE
AE0179
1. Specification subject to change without notice.
2. All dimensions and specifications apply to standard modules. This information may vary for modules with optional
features.
3. All dimensions are in millimeters.
4. Precautions:These precautions apply equally to modules from all makers, not just Densitron. Violation of these
guidelines may void the warrant y and can cause problems ranging from erratic operation to catastrophic display
failure.
Handling precautions:
♦ This device is susceptible to Electro-Static Discharge (ESD) damage. Observe Anti-Static precautions.
Pow er supply precautions:
♦ Identify and, at all times, observe absolute maximum ratings for both logic and LC drivers. Note that there is some
variance between models.
♦ Prevent the application of reverse polarity to VDD and VSS, however briefly.
♦ Use a clean power source free from transients. Power up conditions are occasionally “jolting” and may exceed the
maximum ratings of the module.
♦ The +5V power of the module should also supply the power to all devices which may access the display. Don’t allow
the data bus to be driven when the logic supply to the module is turned off.
♦ DO NOT install a capacitor between the VO (contrast) pin and ground. VDD must, at all times, exceed the VO voltage
level. The capacitor combines with the contrast potentiometer to form an R-C network which “holds-up” VO, at power-
down, possibly damaging the module.
Operating precautions:
♦ DO NOT plug or unplug the module when the system is powered up.
♦ Minimize the cable length between the module and host MPU. (Recommended max. length 30 cm).
♦ For models with EL backlights, do not disable the backlight by interrupting the HV line. Unloaded inverters produce
voltage extremes which may arc within a cable or at the display.
♦ Operate the module within the limits of the modules temperature specifications.
Mechanical / Environmental precautions:
♦ Improper soldering is the major cause of module difficulty. Use of flux cleaner is not recommended as they may seep
under the elastomeric connection and cause display failure. Densitron recommends the use of Kester “245” no-clean
solder.
♦ Mount the module so that it is free from torque and mechanical stress.
♦ Surface of LCD panel should not be touched or scratched. The display front surface is an easily scratched, plastic
polarizer. Avoid contact and clean only when necessary with soft, absorbent cotton dampened with petroleum
benzene.
♦ ALWAYS employ anti-static procedure while handling the module.
♦ Prevent moisture build-up upon the module and observe the environmental constraints for storage temperature and
humidity.
♦ DO NOT store in direct sunlight.
♦ If leakage of the liquid crystal material should occur, avoid contact with this material, particularly ingestion. If the body
or clothing becomes contaminated by the liquid crystal material, wash thoroughly with water and soap.
Notes: (unless otherwise specified)
SHEET OF
DWG. NO. LM4045 REV. A
1.0 DESCRIPTION
Dot matrix display module consisting of a Liquid Crysta l Display, CMOS driver and controller LSI, print ed
circuit board, m etal support frame and array type Light Emitt ing Diode (LED) backlight.
Available LC fluids types are: TN (twisted nematic), TN-H (extended temperature range TN), NTN
(supertwisted nematic), NTN-H (extended temperature range NTN).
2.0 MECHANIC AL CHARACTERI S TICS
Item Specifications Unit
Package Dimensions 77.0 (W) x 47.0 (H) x 16.6 max. (D) mm
Display format 4 line x 20 characters -
Character font format 5 (W) x 7 (H) with attached cursor dots
Driving method 1/16 duty
Dot size 0.42 (W) x 0.46 (H) mm
Dot pitch 0.468 (W) x 0.508 (H) mm
Character Size 2.292 (W) x 4.016 (H) mm
Active display area 55.0 (W) x 17.5 (H) mm
Viewing area 58.6 (W) x 21.1 (H) mm
Weight g
Notes:W-Width;H-Height;D-Depth.
3.0 ABSOLUTE MAXIMUM RATINGS VSS=0V;Ta=25°C
Item Symbol TN, NTN TN-H, NTN-H Unit
Min. Max. Min. Max.
Logic supply voltage VDD-VSS 070 7 V
LC driver supply voltage VDD-VO060 13 V
Operating temperature
Storage temperature (Note 1) TOP
TST 0
-20 +50
+70 -20
-30 +70 (Note 3)
+80 °C
Humidity: Operating (@40°C)
Non-operating (@40°C) -
--
-85%
95% -
-85%
95% RH (Note 2)
RH (Note 2)
Notes: 1: Tested to 100 hrs.
2: Refers to non-condensing conditions.
3. With backlight off.
4.0 ELECTRICAL CHARACTERISTICS VDD=5±0.25V;Ta=25°C
Item Symbol Test Condition Min. Typ. Max. Unit
Input “High” voltage VIH -2.2 - VDD V
Input “Low” voltage VIL ---0.6V
Out put “ H igh” voltage VOH IOH=0.205mA 2.4 - - V
Output “Low” voltage VOL IOL=1.2mA - - 0.4 V
Power supply current IDD VDD=5.0V - 3.0 - mA
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SHEET 3 OF 8
DWG. NO. LM4045 REV.A
5.0 RECOMMENDED LC DRIVE VOLTAGE (VDD-VO)VDD=5.0±0.25V
Temperature TN TN-H NTN NTN-H
Ta= -20°C - 9.9 - 9.5
Ta= 0°C 4.8 9.3 4.5 8.9
Ta= 25°C 4.6 8.5 4.2 8.2
Ta= 50°C 4.4 8.0 3.9 7.7
Ta=70°C - 7.5 - 7.2
6.0 BACKLIGHT SPECIFICATIONS: Ta=20°C,60%RH,Darkroom.
Item Symbol Typ. Max. Unit
LED input vo lta ge VLED 56V
LED inpu t current ILED 200 250 mA
Built-in current limiting resistor R1 - - Ohms, W
External current limiting resistor (recommended) R2 5.6 Ohm, 1/2
W-Ohms, W
Number of nodes N 20 - -
7.0 POWER SUPPLY
V
VV
V
DD
OR
SS
L
C
D
+5V
-5V
V
VV
V
DD
OR
SS
L
C
D+5V
T
N
-
H
,
N
T
N
-
H
T
N
,
N
T
N
V=1
0
K-2
0
K ohm
R
9.0 BLOCK DIAGRAM:
SHEET OF
DWG. NO. LM4045 REV. A
8.0 INTERF ACE DESCRIPTION
Pin No. Symbol I /O Function
1V
SS - Ground (0V)
2V
DD - Logic Supply Voltage (+5V)
3V
O- LC Drive voltage for contrast adjustment
4 RS I Register Select 0: Instruction Register
1: Data Register
5 R/W I Read / Write 0: Data Write (Module
MPU)
1: Data Read (Module
MPU)
6 E I Enable Signal Active High (H
L)
7 DB0 I/O Bi-directional data bus line 0
8 DB1 I/O Bi-directional data bus line 1
9 DB2 I/O Bi-directional data bus line 2
10 DB3 I/O Bi-directional data bus line 3
11 DB4 I/O Bi-directional data bus line 4
12 DB5 I/O Bi-directional data bus line 5
13 DB6 I/O Bi-directional data bus line 6
14 DB7 I/O Bi-directional data bus line 7
BL1 VLED+ - Anode (+): LED backlight input voltag e
BL2 VLED- - Cathode (-): LED backlig ht input voltage
84
H
D
4
4
7
8
0
LCD PANEL
BACKLIGHT
8
E
R/W
RS
DB0 ~
DB7
BL1
B
L
2
VO
VDD
VSS
40 40
16
4DRIVER
SHEET OF
DWG. NO. LM4045 REV. A
10.0 TIMI NG CH ARACTERISTICS
Item Symbol Min. Typ. Max. Unit
Enable cycle time TcycE 500 - - nS
Enable pulse width PWEH 230 - - nS
Enable rise / fall time tEr/tEf - - 20 nS
Address set-up time tAS 40 - - nS
Address hold time tAH 10 - - nS
Data delay time tDDR - - 160 nS
Data hold time (Write) tDHW 10 - - nS
Data hold time (Read) tDHR 5--nS
Data set-up time tDSW 80 - - nS
85
11.0 DD RAM ADDRESS vs. DISPLAY POSITION
Character 1 2 3 4 5 6 7 8 9 10 11 --- 18 19 20
Line 1 00 01 02 03 04 05 06 07 08 09 0A --- 11 12 13
Line 2 40 41 42 43 44 45 46 47 48 49 4A --- 51 52 53
Line 3 14 15 16 17 18 19 1A 1B 1C 1D 1E --- 25 26 27
Line 4 54 55 56 57 58 59 5A 5B 5C 5D 5E --- 65 66 67
VI
PWEH
VI
VI
VIH
tDSW tH
tAH
tc
y
cE
tEr
tEf
tAS tAH
VI
VIH
VI
VI
VI
VI
VIH
VIH
VIH
VI
VIH
RS
E
DB0
to
DB7
R/W
Valid
Data
PWEH
VIH
VIH
VI
VIH
tDDR tDHR
tAH
tc
y
cE
tEr
tEf
tAS tAH
VI
VIH
VI
VI
VI
VOL
VOL
VIH
VIH
VOH
VOH
RS
E
DB0
to
DB7
R/W
Valid
Data
READ OPERATION
WRITE OPERATION
SHEET OF
DWG. NO. LM4045 REV. A
12.0 OPTICAL CHARACTERISTICS
Item Symbol Test Condition Min. Typ. Max. Unit
Con trast ratio TN, TN-H K Ø=20° θ=0° 3---
Contrast ratio NTN K Ø=20° θ=0° 4---
Contrast ratio NTN- H K Ø=20° θ=0° 5---
Viewing angle TN, TN-H Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 20
±30 -
--
-Deg.
Deg.
Viewing angle NTN Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 40
±30 -
--
-Deg.
Deg.
Viewing angle NTN-H Ø2-Ø1
θθ=0° K>1.4
Ø=20° K=1.4 40
±40 -
--
-Deg.
Deg.
Response time Rise
Fall tr
tfØ=20° θ=0°
Ø=20° θ=0° -
-150
150 250
250 mS
mS
86
1.4
Ø1 Ø2
NTN, NTN-H: Ø1 < 0° < Ø2
TN, TN-H: Ø1 < 20° < Ø2
Viewing angle
Contrast ratio
Brightness
B2
B1
Driving voltage
Selected dot
Non-selected
dot
XX'
Ø2
Ø1
Y
Y'
Brightness of non-selected dots
Brightness of selected dots
K =
DEFINITION OF CONTRAST RATIO (K) CONTRAST VERSUS VIEWING ANGLE
DEFINITION OF ANGLES Ø AND
100%
90%
10%
tr tf
Brightness
Selected Non-selected
Non-selected
DEFINITION OF OPTICAL RESPONSE
θ
θ
SHEET OF
DWG. NO. LM4045 REV. A
14.0 PART NUM BER DESCRIPTIO N FOR AVAILABLE OPTIONS
LM40454C20
Polarizer Type
B = Transflective: light background with LED backlight
E = Transmissive: dark background wit h LED backlight
F = Transmissive: light background with LED backlight
Backlight Col or
G = Yellow-green (standard)
R = Red
Fluid Type and Power Supply
C = TN with +5VDC operation or TN-H with ±5VDC oper ation
S = NTN wit h +5VDC oper ation
H = NTN-H wi th ±5VDC operation
Fluid Type/TN Vi ewin g Di rection
B = TN, TN-H bottom viewing
T = TN, TN-H top viewing
N = NTN, NTN- H
Background Color for NTN, NTN-H or TN Temperature Range
B = Blue background
G = Gray background
Y = Yellow background
H = TN-H
88