LMT035ENAFWA
LCD Module User Manual
Prepared by:
Checked by:
Approved by:
Linli
Date: 2020-03-18
Date:
Date:
Rev. Descriptions
Release Date
0.1
- Preliminary Draft release
2020-03-18
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LCD Module User Manual
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Table of Contents
1 General Specifications ............................................................................................................................. 3
2 Input/Output Terminals ............................................................................................................................ 4
3 Absolute Maximum Ratings .................................................................................................................... 5
4 Electrical Characteristics ......................................................................................................................... 5
4.1 Driving TFT LCD Panel .................................................................................................................... 5
4.2 Backlight Unit ..................................................................................................................................... 6
4.3 Block Diagram .................................................................................................................................... 6
5 Timing Chart .............................................................................................................................................. 7
6 Optical Characteristics .......................................................................................................................... 11
7 Environmental / Reliability Tests .......................................................................................................... 14
8Precautions for Use of LCD Modules ................................................................................................... 15
8.1 Handling Precautions ..................................................................................................................... 15
8.2 Storage precautions ........................................................................................................................ 15
8.3 Transportation Precautions ............................................................................................................ 15
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1 General Specifications
Feature
Spec
Size
3.5 inch
Resolution
320(RGB)x240
Interface
RGB 24 bit
Color Depth
16.7MK
Technology Type
a-Si
Display Spec.
Pixel pitch(mm)
0.219x0.219
Pixel Configuration
R.G.B Vertical Stripe
Surface Treatment
Glare
Viewing Direction
Full View
Gray Scale Inversion Direction
Full View
LCM (W x H x D) (mm)
76.8x63.8x3.3
Active Area(mm)
70.08x52.56
Mechanical
Driver IC
ST7272-G4
Characteristics
With /Without TSP
Without TSP
Weight (g)
LED Numbers
30.7g
6LEDs
Note 1:Requirements on Environmental Protection:
RoHS Note 2: LCM weight tolerance:± 5%
Note 3: The main FPC and plastic frame can fulfill UL94-V0
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2 Input/Output Terminals
2.1 TFT LCD Panel
No
Symbol
I/O
Description
Comment
1~2
VBL-
P
CATHODE OF BACKLIGHT LED
3~4
VBL+
P
ANODE OF BACKLIGHT LED
5
NC
-
NC
6
/RESET
I
SYSTEM Reset pin.internal pull high
7
CSB
I
Chip select pin of serial interface.internal pull high
8
SCL
I
Clock pin of serial interface 。 Internal pull high
9~10
SDA
I/O
Serial communication data input and output.
11~18
B7~B0
I/O
BLUE DATA
19~26
G7~G0
I/O
GREEN DATA
27~34
R7~R0
I/O
RED DATA
35
DCLK
I
Dot-clock signal and oscillator source.
36
HSYNC
I
Line synchronization siganl
37
VSYNC
I
Frame synchronization siganl
38
ENB
I
Diaplay enable pin from controller
39~40 VDD(ANALOG)
P
Power supply for analog circuit.
Power supply for digital I/O pins.
41~42
NC
-
NC
43
NC(YU)
-
NC(Touch panel Y up line)
44
NC(XR)
NC(Touch panel X right line)
45
NC(XD)
NC(Touch panel Y down line)
46
NC(XL)
NC(Touch panel X left line)
Dicplay shut down pin to put the drive into sleep mode.
A sharp falling edge must be provided to such pin when
47
SHUT
I
IC power on. Internal pull low
-Connect to VDDIO for sleep mode.
-Connect to VSS for normal operating mode.
48
NC
-
NC
49~50
VSS
-P
System ground pin of the IC
Note 1: I——Input ， O——Output ， P——Power/Ground,
Table 2.1 Terminal pin assignment
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3 Absolute Maximum Ratings
3.1 Driving TFT LCD Panel
Ta =25 ℃
Item
Symbol
MIN
MAX
Unit Remark
Power Voltage
VDD
--
4.0
V
Back Light Forward
Current
ILED
--
25
mA
For each LED
Back Light Forward
Current Voltage
VLED
--
18.6
V
Operating
℃
Temperature
Top
-20
70
Storage Temperature Tst
-30
80
℃
Relative Humidity
Note1
RH
--
90
%
Note2
Absolute Humidity
AH
--
≤70
g/m³ Ta ＞ 70 ℃
Note1: Ta means the ambient temperature.
It is necessary to limit the relative humidity to the specified temperature range.
Condensation .on the module is not allowed.
Note2: Ta  60  C ： 90% RH MAX （ 96HRS MAX ）
Ta  60  C ： ABSOLUTE HUMIDITY MUST BE LOWER THANTHE HUMIDITY OF 90%RH AT
60  C （ 96HRS MAX ）
4 Electrical Characteristics
4.1 Driving TFT LCD Panel
GND=0V ， Ta=25 ℃
Item
Symbol
MIN
TYP
MAX
Unit
Remark
Supply Voltage
VDD
3.0
3.3
3.6
V
Logic Signal Voltage
VCC
3.0
3.3
3.6
Input Signal Low Level
VIL
--
—
0.3* VCC
V
Voltage
High Level
VIH
0.7* VCC
—
--
V
Low Level
Output
(VOL)
IOL=+1.0mA
DGND
—
DGND+0.4
V
Signal
Voltage
High Level
(VOH)
IOH=-1.0mA
VDDI-0.4
—
VDDI
V
Analog
Displon on
operating
IDD
-
20
30
mA Static VDD=3.3V
operating
current
Without Backlight
current
Digital
Displon on Static
operating
ICC
-
1
2
mA Vcc=3.3V
current
Without Backlight
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4.2 Backlight Unit
Ta=25 ℃
Item
Symbol MIN
TYP
MAX
Unit
Remark
Forward Current
IF
—
20
25
mA
Note 4
Forward Current Voltage
VF
—
18
18.6
V
Note 1,2
Backlight Power Consumption WBL
—
360
465
mW
For total LEDs
LED lifetime
L
30000
40000
—
Hours
Note1,2,3,4
Note1: The LED driving condition is defined for each LED module (1 LED Serial,1 LED Parallel).
Note2: Under LCM operating, the stable forward current should be inputted. And forward voltage is for reference only.
Note3:Optical performance should be evaluated at Ta=25 ℃ onlyIf LED is driven by high current, high ambient
temperature & humidity condition. The life time of LED will be reduced.Operating life means brightness goes down to
50% initial brightness. Typical operating life time is estimated data.At the same time the luminance of Backlight would
decrease under the hight temperature.
Note4:The LED driving condition is defined for each LED module.
4.3 Block Diagram
LCD module diagram
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5 Timing Chart
5.1 INTERFACE TIMING
Note:Pleasereferto ST7272A datasheetformoredetails.
5.1.1 interface l
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6 Optical Characteristics
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Test Conditions:
1. I F = 20mA, and the ambient temperature is 25 ℃ .
2. The test systems refer to Note 1 and Note 2.
3. Note 1:Definition of optical measurement system.
The optical characteristics should be measured in dark room. After 5 Minutes operation, the optical
properties are measured at the center point of the LCD screen. All input terminals LCD panel must
be ground when measuring the center area of the panel.
Note 2: Definition of viewing angle range and measurement system.
viewing angle is measured at the center point of the LCD 。
Note 3: Definition of contrast ratio
“White state “: The state is that the LCD should drive by Vwhite.
“Black state”: The state is that the LCD should drive by Vblack.
Vwhite: TBD V
Vblack: TBD V.
Note 4: Definition of Response time
The response time is defined as the LCD optical switching time interval between “White” state and
“Black” state. Rise time (T ON ) is the time between photo detector output intensity changed from 90%
to 10%. And fall time (T OFF ) is the time between photo detector output intensity changed from 10% to
90%.
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Note 5: Definition of color chromaticity (CIE1931)
Color coordinates measured at center point of
LCD. Note 6: Definition of Luminance Uniformity
Active area is divided into 9 measuring areas (Refer Fig. 2). Every measuring point is placed at
the center of each measuring area.
Luminance Uniformity (U) :
L-------Active area length W----- Active area width
Fig. 2
Note 7: Definition of Luminance:
Measure the luminance of white state at center point.
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7 Environmental / Reliability Tests
No
Test Item
Condition
Remarks
1
High Temperature
Ts=+70 ℃ , 240hrs
Note1
Operation
IEC60068-2-1,GB2423.2
2
Low Temperature
Ta=-20 ℃ , 240hrs
IEC60068-2-1
Operation
GB2423.1
3
High Temperature
Ta=+80 ℃ , 240hrs
IEC60068-2-1
Storage
GB2423.2
4
Low Temperature
Ta=-30 ℃ , 240hrs
IEC60068-2-1
Storage
GB2423.1
High Temperature
Ta=+60 ℃ , 90% RH
Note2
5 & High Humidity
IEC60068-2-78
Storage
240 hours
GB/T2423.3
-30 ℃ 30 min~+80 ℃ 30 min,, 10
Cycles
Start with cold temperature,
6
Thermal Shock
(Non-operation)
End with high temperature,
IEC60068-2-14,GB2423.22
Electro Static
C=150pF, R=330Ω ， l
7 Discharge
Air:±12KV,
IEC61000-4-2
(NOT OPERATED) Contact:±8KV,
GB/T17626.2
Package
Height:80 cm,
8
IEC60068-2-32
Drop Test
1 corner, 3 edges, 6 surfaces
GB/T2423.8
Note1: Ts is the temperature of panel’s surface.
Note2: Ta is the ambient temperature of sample.
Note3: Before cosmetic and function test, the product must have enough recovery time, at least 2
hours at room temperature.
Note 4: In the standard condition, there shall be no practical problem that may affect thedisplay
function. After the reliability test, the product only guarantees operation,but don’t guarantee all of the
cosmetic specification.
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8 Precautions for Use of LCD Modules
8.1 Handling Precautions
8.1.1 The display panel is made of glass. Do not subject it to a mechanical shock by dropping
itfrom a high place, etc.
8.1.2 If the display panel is damaged and the liquid crystal substance inside it leaks out, be sure not to
get any in your mouth, if the substance comes into contact with your skin or clothes, promptly
wash it off using soap and water.
8.1.3 Do not apply excessive force to the display surface or the adjoining areas since this may cause
the color tone to vary.
8.1.4 The polarizer covering the display surface of the LCD module is soft and easily scratched.
Handle this polarizer carefully.
8.1.5 If the display surface is contaminated, breathe on the surface and gently wipe it with a soft dry
cloth. If still not completely clear, moisten cloth with one of the followingsolvents:
- Isopropyl alcohol
- Ethyl alcohol
Solvents other than those mentioned above may damage the polarizer. Especially, do not use the
following:
- Ketone
- Aromatic solvents
8.1.6 Do not attempt to disassemble the LCD Module.
8.1.7 If the logic circuit power is off, do not apply the input signals.
8.1.8 To prevent destruction of the elements by static electricity, be careful to maintain an optimum
work environment.
8.1.8.1 Be sure to ground the body when handling the LCD Modules.
8.1.8.2 Tools required for assembly, such as soldering irons, must be properly ground.
8.1.8.3 To reduce the amount of static electricity generated, do not conduct assembly and other
work under dry conditions.
8.1.8.4 The LCD Module is coated with a film to protect the display surface. Be careful when
peeling off this protective film since static electricity may be generated.
8.2 Storage precautions
8.2.1 When storing the LCD modules, avoid exposure to direct sunlight or to the light of fluorescent
lamps.
8.2.2 The LCD modules should be stored under the storage temperature range. If the LCD modules
will be stored for a long time, the recommend condition is:
Temperature : 0 ℃ ～ 40 ℃ Relatively humidity: ≤80%
8.2.3 The LCD modules should be stored in the room without acid, alkali and harmful gas.
8.3 Transportation Precautions
8.3.1 The LCD modules should be no falling and violent shocking during transportation, and also
should avoid excessive press, water, damp and sunshi
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RGB RGB
RGB RGB
RGB RGB
A K