PRODUCT SPECIFICATIONS Displaytech Ltd

PRODUCT SPECIFICATIONS Displaytech Ltd
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
PRODUCT SPECIFICATIONS
n PHYSICAL DATA
n EXTERNAL DIMENSIONS
n BLOCK DIAGRAM
n ABSOLUTE MAXIMUM RATINGS
n ELECTRICAL CHARACTERISTICS
n OPERATING PRINCIPLES & METHODS
n DISPLAY DATA RAM ADDRESS MAP
n ELECTRO-OPTICAL CHARACTERISTICS
n INTERFACE PIN CONNECTIONS
n CIRCUIT DIAGRAM
n RELIABILITY
n QUALITY GUARANTEE
n INSPECTION CRITERIA
n PRECAUTIONS FOR USING LCD MODULES
n USING LCD MODULES
P 1 of 18
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
n PHYSICAL DATA
Item
LCD type
LCD duty
LCD bias
Viewing direction
Module size (W×H×T)
Viewing area (W×H)
Number of dots
Dot size (W×H)
Dot pitch (W×H)
Contents
STN / FSTN
1/64
1/9
6 / 12
93 × 70 × 11.0 MAX (14.0 MAX W/LED BACKLIGHT)
70.7× 38.8
128 × 64
0.48 × 0.48
0.52 × 0.52
n EXTERNAL DIMENSIONS
n BLOCK DIAGRAM
Unit
------o’clock
mm
mm
dots
mm
mm
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Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
n ABSOLUTE MAXIMUM RATINGS ( Ta = 25°C )
Parameter
Supply voltage for logic
Supply voltage for LCD
Input voltage
Normal operating temperature
Normal storage temperature
Wide operating / storage
temperature (except FSTN)
Wide operating / storage
temperature (FSTN)
Symbol
VDD
VO
VI
TOP
TST
TOP / TST
Min
-0.3
VDD-19
-0.3
0
-10
-30
Max
7.0
VDD+0.3
VDD+0.3
50
60
80
Unit
V
V
V
°C
°C
°C
TOP / TST
-30
70
°C
n ELECTRICAL CHARACTERISTICS ( VDD = +5V±5% , VSS = 0V, Ta = 25°C )
DC Characteristics
Parameter
Supply voltage for logic
Supply current for logic
Operating voltage for LCD
Input voltage ' H ' level
Input voltage ' L ' level
Symbol
VDD
IDD
VDD - VO
VIH
VIL
Condition
----25°C
-----
Min
4.5
--8.0
0.7VDD
0
Typ
5.0
2.02
8.5
-----
Max
5.5
4
9.0
VDD
0.3VDD
Unit
V
mA
V
V
V
l Backlight operating information (Ta = 25°C )
LED Backlight
Light box Y/G (-2)
White (-3LP)
Blue (-4LP)
Green (-5LP)
Amber (-6LP)
EL Backlight
EL (B)
Supply voltage VF (V)
Min
Typ
Max
--4.2
4.6
--3.4
3.5
--3.4
3.5
--3.4
3.5
--1.8
1.9
EL Enable voltage EON (VAC)
Min
Typ
Max
--100
150
Supply current IF (mA)
Typ
Max
500
840
40
50
40
50
40
50
40
50
EL frequency LF (Hz)
Min
Typ
Max
--400
1000
Min
-----------
AC Characteristics
l MPU Interface
Characteristic
E cycle
E high level width
E low level width
E rise time
E fall time
Address set-up time
Address hold time
Data set-up time
Data delay time
Data hold time(write)
Data hold time(read)
Symbol
tcyc
twhE
twlE
tr
tf
tas
tah
tdsw
tddr
tdhw
tdhr
Min
1000
450
450
----140
10
200
--10
20
Typ
-----------------------
Max
------25
25
------320
-----
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
P 3 of 18
Displaytech Ltd
LCD MODULE
64128A SERIES
MPU Write Timing
MPU Read Timing
Version : 1.1
P 4 of 18
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 5 of 18
n OPERATING PRINCIPLES & METHODS
I/O Buffer
Input buffer controls the status between the enable and disable of chip. Unless the CS1 or CS2 is in active mode, input or
output of data and instruction do not execute. Therefore internal state is not changed. But RSTB can operate regardless of CS1
and CS2.
Input Register
Input register is provided to interface with MPU which is different operating frequency. Input register stores the data
temporarily before writing it into display data RAM.
When CS1 or CS2 is in the active mode, R/W and RS select the input register. The data from MPU is written into input
register and then write it into display data RAM. Data is latched when falling of the E signal and written automatically into the
display data RAM by internal operation.
Output Register
Output register stores the data temporarily from display data RAM when CS1 or CS2 is in active mode and R/W and RS=H.
Stored data in display data RAM is latched in output register. When CS1 or CS2 is in active mode and R/W=H, RS=L, status
data (busy check)can be read out.
To read the contents of display data RAM, twice access of read instruction is needed. In first access, data in display data
RAM is latched into output register. In second access, MPU can read data which is latched. That is, to read the data in display
data RAM, it needs dummy read. But status read does not need dummy read.
RS
0
1
R/W
0
1
0
1
Function
Instruction
Status read(busy cheek)
Data write(from input register to display data RAM
Data read(from display data RAM to output register)
Reset
System reset can be initialized by setting RSTB terminal at low level when turning power on, receiving instruction from
MPU. When RSTB becomes low, following procedure is occurred.
- Display off
- Display start line register becone set by 0.(Z-address 0)
While RSTB is low level, no instruction except status read can be accepted. Reset status appears at DB4. After DB4 is low,
any instruction can be accepted.
The Conditions of power supply at initial power up are shown in table 1.
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 6 of 18
Table 1. Power Supply Initial Conditions
Item
Reset time
Rise time
Symbol
tRST
tr
Min
1.0
---
Typ
-----
Max
--200
Unit
us
ns
4.5[V]
VDD
tRST
tr
RSTB
0.7VDD
0.3VDD
Busy Flag
Busy flag indicates that KS0108B is operating or not operating. When busy flag is high, KS0108B is in internal operating.
When busy flag is low, KS0108B can accept the data or instruction.
DB7 indicates busy flag of the KS0108B.
E
Busy flag
Display ON/OFF Flip-Flop
The display on/off flip-flop makes on/off of the liquid crystal display. When flip-flop is reset (logical low). selective voltage
or non selective voltage appears on segment output terminals. When flip-flop is set (logical high).non selective voltage appears
on segment output terminals regardless of display RAM data.
The display on/off flip-flop can change status by instruction. The display data at all segment disappear while RSTB is low.
The status of the flip-flop is output to DB5 by read instruction.
X page Register
X page register designates page of the internal display data RAM. It has not count function. An address is set by instruction.
Y Address Counter
Y address counter designates address of the internal display data RAM. An address is set by instruction and is increased by 1
automatically by read or write operations of display data.
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 7 of 18
Display Data RAM
Display data RAM stores a display data for liquid crystal display. To express on state of dot matrix of liquid crystal display.
write data 1. The other way. off state writes 0.
Display Start Line Register
The display start line register indicates address of display data RAM to display top line of liquid crystal display. Bit data
(DB<0:5>) of the display start line set instruction is latched in display start line register. It is used for scrolling of the liquid
crystal display screen.
Display Control Instruction
The display control instructions control the internal state of the KS0108B. Instruction is received fom MPU to KS0108B for
the display control. The following table shows various instructions.
Instruction
Display ON/OFF
RS
0
Set Address
0
Set Page
(X address)
Display Start Line
0
Status Read
0
Write Display Data
1
Read Display Data
1
0
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Function
0
0
0
1
1
1
1
1
0/1 Controls the display on or off.
Internal status and display RAM
data are not affected.
0:OFF, 1:ON
0
0
1
Sets the Y address in the Y
Y address (0∼63)
address counter.
0
1
0
1
1
1
Page
Sets the X address at the X
address register.
(0∼7)
0
1
1
Display start line
Indicates the display data RAM
displayed at the top of the screen.
(0∼63)
1
B
0
O
R
0
0
0
0 Read status.
U
N
E
BUSY
0 : Ready
S
/
S
1 : In operation
Y
O
E
ON/OFF
0 : Display ON
F
T
1 : Display OFF
F
RESET
0 : Normal
1 : Reset
0
Write Data
Writes data (DB0:7) into display
data
RAM.
After
writing
instruction,
Y
address
is
increased by 1 automatically.
1
Read Data
Reads data (DB0:7) from display
data RAM to the data bus.
Displaytech Ltd
LCD MODULE
n DISPLAY DATA RAM ADDRESS MAP
64128A SERIES
Version : 1.1
P 8 of 18
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 9 of 18
n ELECTRO-OPTICAL CHARACTERISTICS ( VOP = 8.5V, Ta = 25°C )
LCD mode
STN Y/G (B)
STN Blue (C)
STN Grey (D)
FSTN (F)
FSTN Negative (G)
Typ response
time Tr (ms)
Typ response
time Tf (ms)
Normal
temp
Normal
temp
331
Wide
temp
167
91
Wide
temp
66
Typ viewing angle θ (deg)
Typ contrast
ratio Cr
∅ = 0°
∅ = 90°
∅ = 180°
∅ = 270°
14
4
7
21
9
55
47
54
60
48
30
24
28
45
24
34
29
32
53
30
28
23
28
43
23
Note1: Definition of response time.
Note2: Definition of contrast ratio ‘Cr’
.
Note3: Definition of viewing angle range ‘θ’.
Displaytech Ltd
LCD MODULE
64128A SERIES
n INTERFACE PIN CONNECTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
VSS
VDD
VO
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
CS1
CS2
RSTB
VOUT
A
K
Level
0V
5.0V
--H/L
H/L
H, H → L
H/L
H/L
H/L
H/L
H/L
H/L
H/L
H/L
H
H
L
-5V
-----
Description
Ground
Supply voltage for logic
Input voltage for LCD
H : Data, L : Instruction code
H : Read mode, L : Write mode
Chip enable signal
Data bit 0
Data bit 1
Data bit 2
Data bit 3
Data bit 4
Data bit 5
Data bit 6
Data bit 7
Chip select signal for IC1
Chip select signal for IC2
Reset signal
Output voltage for LCD
Back light anode
Back light cathode
Version : 1.1
P 10 of 18
Displaytech Ltd
n CIRCUIT DIAGRAM
LCD MODULE
64128A SERIES
Version : 1.1
P 11 of 18
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 12 of 18
n RELIABILITY
u Content of Reliability Test
No.
1
2
3
4
5
6
7
Environmental Test
Content of Test
Test Item
High temperature
storage
Low temperature
storage
High temperature
operation
Low temperature
operation
High temperature /
Humidity storage
High temperature /
Humidity operation
Temperature cycle
Endurance test applying the high storage
temperature for a long time.
Endurance test applying the low storage
temperature for a long time.
Endurance test applying the electric stress
(Voltage & Current) and the thermal stress to
the element for a long time.
Endurance test applying the electric stress
under low temperature for a long time.
Endurance test applying the high temperature
and high humidity storage for a long time.
Endurance test applying the electric stress
(Voltage & Current) and temperature /
humidity stress to the element for a long time.
Endurance test applying the low and high
temperature cycle.
-10°C
25°C
60°C
30min
5min.
30min
.
.
1 cycle
Mechanical Test
Endurance test applying the vibration during
transportation and using.
8
Vibration test
9
Shock test
Constructional and mechanical endurance test
applying the shock during transportation.
10
Atmospheric
pressure test
11
Static electricity test
Endurance test applying the atmospheric
pressure during transportation by air.
Others
Endurance test applying the electric stress to
the terminal.
Test Condition
60 °C
200 hrs
-10 °C
200 hrs
50 °C
200 hrs
0 °C
200 hrs
60 °C , 90 %RH
96 hrs
40 °C , 90 %RH
96 hrs
Applicable
Standard
-----------
----------MIL-202E-103B
JIS-C5023
MIL-202E-103B
JIS-C5023
-10°C / 60°C
10 cycles
------
10∼22Hz → 1.5mmp-p
22∼500Hz → 1.5G
Total 0.5hrs
50G half sign
wave 1l msedc
3 times of each
direction
115 mbar
40 hrs
VS=800V , RS=1.5 kΩ
CS=100 pF
1 time
∗∗∗ Supply voltage for logic system = 5V. Supply voltage for LCD system = Operating voltage at 25°C.
MIL-202E-201A
JIS-C5025
JIS-C7022-A-10
MIL-202E-213B
MIL-202E-105C
MIL-883B-3015.1
u Failure Judgement Criterion
Criterion Item
1
Basic specification
Electrical characteristic
Mechanical characterstic
Optical characterstic
2
3
4
Test Item No.
5 6 7 8
Failure Judgment Criterion
9 10 11
Out of the Basic Specification
Out of the DC and AC Characterstic
Out of the Mechanical Specification Color
change : Out of Limit Apperance Specification
Out of the Apperance Standard
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 13 of 18
n QUALITY GUARANTEE
u Acceptable Quality Level
Each lot should satisfy the quality level defined as follows.
- Inspection method : MIL-STD-105E LEVEL II Normal one time sampling
- AQL
Partition
AQL
Definition
A: Major
0.4%
Functional defective as product
B: Minor
1.5%
Satisfy all functions as product but not satisfy cosmetic standard
u Definition of ‘LOT’
One lot means the delivery quantity to customer at one time.
u Conditions of Cosmetic Inspection
l Environmental condition
The inspection should be performed at the 1m of height from the LCD module under 2 pieces of 40W white fluorescent
lamps (Normal temperature 20∼25°C and normal humidity 60±15%RH).
l Inspection method
The visual check should be performed vertically at more than 30cm distance from the LCD panel.
l Driving voltage
The VO value which the most optimal contrast can be obtained near the specified VO in the specification. (Within ±0.5V
of the typical value at 25°C.).
n INSPECTION CRITERIA
u Module Cosmetic Criteria
No.
1
2
3
4
5
6
7
8
Item
Difference in Spec.
Pattern peeling
Soldering defects
Resist flaw on substrate
Accretion of metallic
Foreign matter
Stain
Plate discoloring
Solder amount
1. Lead parts
Judgement Criterion
None allowed
No substrate pattern peeling and floating
No soldering missing
No soldering bridge
No cold soldering
Invisible copper foil (∅0.5mm or more) on substrate pattern
No soldering dust
No accretion of metallic foreign matters (Not exceed ∅0.2mm)
No stain to spoil cosmetic badly
No plate fading, rusting and discoloring
a. Soldering side of PCB
Solder to form a ‘Filet’
all around the lead.
Solder should not hide the
lead form perfectly. (too much)
b. Components side
( In case of ‘Through Hole PCB’ )
Partition
Major
Major
Major
Major
Minor
Minor
Minor
Minor
Minor
Minor
Minor
Solder to reach the Components side of PCB.
2. Flat packages
Either ‘toe’ (A) or ‘heal’ (B) of
the lead to be covered by ‘Filet’.
Minor
A
B
Lead form to be assume over
solder.
3. Chips
(3/2) H ≥ h ≥ (1/2) H
Minor
h
H
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 14 of 18
u Screen Cosmetic Criteria (Non-Operating)
No.
Defect
1 Spots
2 Lines
3 Bubbles in polarizer
4
Scratch
5
6
Allowable density
Coloration
7
Contamination
Judgement Criterion
In accordance with Screen Cosmetic Criteria (Operating) No.1.
In accordance with Screen Cosmetic Criteria (Operating) No.2.
Size : d mm
d ≤ 0.3
0.3 < d ≤ 1.0
1.0 < d ≤ 1.5
1.5 < d
Partition
Minor
Minor
Minor
Acceptable Qty in active area
Disregard
3
1
0
In accordance with spots and lines operating cosmetic criteria. When the light
reflects on the panel surface, the scratches are not to be remarkable.
Above defects should be separated more than 30mm each other.
Not to be noticeable coloration in the viewing area of the LCD panels.
Back-lit type should be judged with back-lit on state only.
Not to be noticeable.
Minor
Minor
Minor
Minor
u Screen Cosmetic Criteria (Operating)
No.
Defect
1 Spots
Judgement Criterion
Partition
Minor
A) Clear
Size : d mm
Acceptable Qty in active area
d ≤ 0.1
Disregard
6
0.1 < d ≤ 0.2
2
0.2 < d ≤ 0.3
0
0.3 < d
Note : Including pin holes and defective dots which must be within one pixel
size.
B) Unclear
Size : d mm
d ≤ 0.2
0.2 < d ≤ 0.5
0.5 < d ≤ 0.7
0.7 < d
2
Lines
Acceptable Qty in active area
Disregard
6
2
0
A) Clear
L 5.0
Minor
(0)
∞
(6)
2.0
0.02
See No. 1
W
0.1
0.05
Note : ( ) - Acceptable Qty in active area
L - Length (mm)
W - Width (mm)
∞ - Disregard
B) Unclear
L 10.0
(0)
∞
(6)
2.0
See No. 1
0.05
‘Clear’
= The shade and size are not changed by VO.
‘Unclear’ = The shade and size are changed by VO.
0.3
0.5
W
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LCD MODULE
64128A SERIES
Version : 1.1
P 15 of 18
u Screen Cosmetic Criteria (Operating) (Continued)
No.
3
4
5
6
Defect
Rubbing line
Allowable density
Rainbow
Dot size
7
Uneven brightness
(only back-lit type
module)
Judgement Criterion
Not to be noticeable.
Above defects should be separated more than 10mm each other.
Not to be noticeable.
To be 95% ∼ 105% of the dot size (Typ.) in drawing.
Partial defects of each dot (ex. pin-hole) should be treated as ‘spot’.
(see Screen Cosmetic Criteria (Operating) No.1)
Uneven brightness must be BMAX / BMIN ≤ 2
- BMAX : Max. value by measure in 5 points
- BMIN : Min. value by measure in 5 points
Divide active area into 4 vertically and horizontally.
Measure 5 points shown in the following figure.
¡
Partition
Minor
Minor
Minor
Minor
¡
¡
¡
¡
¡ : Measuring points
Note :
(1) Size : d = (long length + short length) / 2
(2) The limit samples for each item have priority.
(3) Complexed defects are defined item by item, but if the number of defects are defined in above table, the total number
should not exceed 10.
(4) In case of ‘concentration’, even the spots or the lines of ‘disregarded’ size should not allowed. Following three situations
should be treated as ‘concentration’.
- 7 or over defects in circle of ∅5mm.
- 10 or over defects in circle of ∅10mm.
- 20 or over defects in circle of ∅20mm.
n PRECAUTIONS FOR USING LCD MODULES
u Handing Precautions
(1) The display panel is made of glass. Do not subject it to a mechanical shock by dropping it or impact.
(2) If the display panel is damaged and the liquid crystal substance leaks out, be sure not to get any in your mouth. If the
substance contacts your skin or clothes, wash it off using soap and water.
(3) Do not apply excessive force to the display surface or the adjoining areas since this may cause the color tone to vary.
(4) The polarizer covering the display surface of the LCD module is soft and easily scratched. Handle this polarizer
carefully.
(5) If the display surface becomes contaminated, breathe on the surface and gently wipe it with a soft dry cloth. If it is
heavily contaminated, moisten cloth with one of the following solvents :
- Isopropyl alcohol
- Ethyl alcohol
(6) Solvents other than those above-mentioned may damage the polarizer. Especially, do not use the following.
- Water
- Ketone
- Aromatic solvents
(7) Exercise care to minimize corrosion of the electrode. Corrosion of the electrodes is accelerated by water droplets,
moisture condensation or a current flow in a high-humidity environment.
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LCD MODULE
64128A SERIES
Version : 1.1
P 16 of 18
(8) Install the LCD Module by using the mounting holes. When mounting the LCD module make sure it is free of twisting,
warping and distortion. In particular, do not forcibly pull or bend the I/O cable or the backlight cable.
(9) Do not attempt to disassemble or process the LCD module.
(10) NC terminal should be open. Do not connect anything.
(11) If the logic circuit power is off, do not apply the input signals.
(12) To prevent destruction of the elements by static electricity, be careful to maintain an optimum work environment.
- Be sure to ground the body when handling the LCD modules.
- Tools required for assembling, such as soldering irons, must be properly grounded.
- To reduce the amount of static electricity generated, do not conduct assembling and other work under dry conditions.
- The LCD module is coated with a film to protect the display surface. Exercise care when peeling off this protective film
since static electricity may be generated.
u Storage Precautions
When storing the LCD modules, avoid exposure to direct sunlight or to the light of fluorescent lamps. Keep the modules in
bags (avoid high temperature / high humidity and low temperatures below 0°C). Whenever possible, the LCD modules should
be stored in the same conditions in which they were shipped from our company.
u Others
Liquid crystals solidify under low temperature (below the storage temperature range) leading to defective orientation or the
generation of air bubbles (black or white). Air bubbles may also be generated if the module is subject to a low temperature.
If the LCD modules have been operating for a long time showing the same display patterns, the display patterns may remain
on the screen as ghost images and a slight contrast irregularity may also appear. A normal operating status can be regained by
suspending use for some time. It should be noted that this phenomenon does not adversely affect performance reliability.
To minimize the performance degradation of the LCD modules resulting from destruction caused by static electricity etc.,
exercise care to avoid holding the following sections when handling the modules.
- Exposed area of the printed circuit board.
- Terminal electrode sections.
n USING LCD MODULES
u Liquid Crystal Display Modules
LCD is composed of glass and polarizer. Pay attention to the following items when handling.
(1) Please keep the temperature within specified range for use and storage. Polarization degradation, bubble generation or
polarizer peel-off may occur with high temperature and high humidity.
(2) Do not touch, push or rub the exposed polarizers with anything harder than an HB pencil lead (glass, tweezers, etc.).
(3) N-hexane is recommended for cleaning the adhesives used to attach front/rear polarizers and reflectors made of organic
substances which will be damaged by chemicals such as acetone, toluene, ethanol and isopropylalcohol.
(4) When the display surface becomes dusty, wipe gently with absorbent cotton or other soft material like chamois soaked in
petroleum benzin. Do not scrub hard to avoid damaging the display surface.
(5) Wipe off saliva or water drops immediately, contact with water over a long period of time may cause deformation or
color fading.
(6) Avoid contacting oil and fats.
(7) Condensation on the surface and contact with terminals due to cold will damage, stain or dirty the polarizers. After
products are tested at low temperature they must be warmed up in a container before coming is contacting with room
temperature air.
(8) Do not put or attach anything on the display area to avoid leaving marks on.
(9) Do not touch the display with bare hands. This will stain the display area and degradate insulation between terminals
(some cosmetics are determinated to the polarizers).
(10) As glass is fragile. It tends to become or chipped during handling especially on the edges. Please avoid dropping or
jarring.
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LCD MODULE
64128A SERIES
Version : 1.1
P 17 of 18
u Installing LCD Modules
The hole in the printed circuit board is used to fix LCM as shown in the picture below. Attend to the following items when
installing the LCM.
(1) Cover the surface with a transparent protective plate to protect the polarizer and LC cell.
(2) When assembling the LCM into other equipment, the spacer to the bit between the LCM and the fitting plate should
have enough height to avoid causing stress to the module surface, refer to the individual specifications for measurements. The
measurement tolerance should be ±0.1mm.
u Precaution for Handing LCD Modules
Since LCM has been assembled and adjusted with a high degree of precision, avoid applying excessive shocks to the module
or making any alterations or modifications to it.
(1) Do not alter, modify or change the the shape of the tab on the metal frame.
(2) Do not make extra holes on the printed circuit board, modify its shape or change the positions of components to be
attached.
(3) Do not damage or modify the pattern writing on the printed circuit board.
(4) Absolutely do not modify the zebra rubber strip (conductive rubber) or heat seal connector.
(5) Except for soldering the interface, do not make any alterations or modifications with a soldering iron.
(6) Do not drop, bend or twist LCM.
u Electro-Static Discharge Control
Since this module uses a CMOS LSI, the same careful attention should be paid to electrostatic discharge as for an ordinary
CMOS IC.
(1) Make certain that you are grounded when handing LCM.
(2) Before remove LCM from its packing case or incorporating it into a set, be sure the module and your body have the same
electric potential.
(3) When soldering the terminal of LCM, make certain the AC power source for the soldering iron does not leak.
(4) When using an electric screwdriver to attach LCM, the screwdriver should be of ground potentiality to minimize as
much as possible any transmission of electromagnetic waves produced sparks coming from the commutator of the motor.
(5) As far as possible make the electric potential of your work clothes and that of the work bench the ground potential.
(6) To reduce the generation of static electricity be careful that the air in the work is not too dried. A relative humidity of
50%-60% is recommended.
u Precaution for soldering to the LCM
(1) Observe the following when soldering lead wire, connector cable and etc. to the LCM.
- Soldering iron temperature : 280°C ± 10°C.
- Soldering time : 3-4 sec.
- Solder : eutectic solder.
If soldering flux is used, be sure to remove any remaining flux after finishing to soldering operation. (This does not apply in
the case of a non-halogen type of flux.) It is recommended that you protect the LCD surface with a cover during soldering to
prevent any damage dur to flux spatters.
(2) When soldering the electroluminescent panel and PC board, the panel and board should not be detached more than three
times. This maximum number is determined by the temperature and time conditions mentioned above, though there may be
some variance depending on the temperature of the soldering iron.
(3) When remove the electoluminescent panel from the PC board, be sure the solder has completely melted, the soldered pad
on the PC board could be damaged.
Displaytech Ltd
LCD MODULE
64128A SERIES
Version : 1.1
P 18 of 18
u Precautions for Operation
(1) Viewing angle varies with the change of liquid crystal driving voltage (VO). Adjust VO to show the best contrast.
(2) Driving the LCD in the voltage above the limit shortens its life.
(3) Response time is greatly delayed at temperature below the operating temperature range. However, this does not mean the
LCD will be out of the order. It will recover when it returns to the specified temperature range.
(4) If the display area is pushed hard during operation, the display will become abnormal. However, it will return to normal
if it is turned off and then back on.
(5) Condensation on terminals can cause an electrochemical reaction disrupting the terminal circuit. Therefore, it must be
used under the relative condition of 40°C , 50% RH.
(6) When turning the power on, input each signal after the positive/negative voltage becomes stable.
u Storage
When storing LCDs as spares for some years, the following precaution are necessary.
(1) Store them in a sealed polyethylene bag. If properly sealed, there is no need for dessicant.
(2) Store them in a dark place. Do not expose to sunlight or fluorescent light, keep the temperature between 0°C and 35°C.
(3) The polarizer surface should not come in contact with any other objects. (We advise you to store them in the container in
which they were shipped.)
(4) Environmental conditions :
- Do not leave them for more than 168hrs. at 60°C.
- Should not be left for more than 48hrs. at -20°C.
u Safety
(1) It is recommended to crush damaged or unnecessary LCDs into pieces and wash them off with solvents such as acetone
and ethanol, which should later be burned.
(2) If any liquid leakes out of a damaged glass cell and comes in contact with the hands, wash off thoroughly with soap and
water.
u Limited Warranty
Unless agreed between DISPLAYTECH and customer, DISPLAYTECH will replace or repair any of its LCD modules
which are found to be functionally defective when inspected in accordance with DISPLAYTECH LCD acceptance standards
(copies available upon request) for a period of one year from date of shipments. Cosmetic/visual defects must be returned to
DISPLAYTECH within 90 days of shipment. Confirmation of such date shall be based on freight documents. The warranty
liability of DISPLAYTECH limited to repair and/or replacement on the terms set forth above. DISPLAYTECH will not be
responsible for any subsequent or consequential events.
u Return LCM under warranty
No warranty can be granted if the precautions stated above have been disregarded. The typical examples of violations are :
- Broken LCD glass.
- PCB eyelet’s damaged or modified.
- PCB conductors damaged.
- Circuit modified in any way, including addition of components.
- PCB tampered with by grinding, engraving or painting varnish.
- soldering to or modifying the bezel in any manner.
Module repairs will be invoiced to the customer upon mutual agreement. Modules must be returned with sufficient
description of the failures or defects. Any connectors or cable installed by the customer must be removed completely without
damaging the PCB eyelet’s, conductors and terminals.
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