TOPWAY LMT035FNAFSA LCD Module User Manual
- June 1, 2024
- Topway
Table of Contents
SHENZHEN TOPWAY TECHNOLOGY CO.,LTD.
LMT035FNAFSA
LCD Module User Manual
LMT035FNAFSA LCD Module
Prepared by: Wangxiao
Date: 2023-12-27| Checked by:
Date:| Approved by:
Date:
---|---|---
Rev.| Descriptions| Edit| ReleaseDate
---|---|---|---
0.1| Preliminary| Wangxiao| 2023-12-23
0.2| Update 1.General Specification,3.2. LED Backlight Circuit
Characteristics, Luminance and Outline dwg| Wangxiao| 2023-12-27
General Specification
| Screen Size (Diagonal): | 3.5” |
|---|---|
| Active Area: | 70.08×52.56(mm) |
| Number of dots: | 320 (RGB)x240 |
| Pixel Pitch: | 0.219×0.219(mm) |
| Color Depth: | 16.7Mcolors |
| Display Technology: | a-Si |
| Display Mode: | Normal Black, Transmissive |
| Display Interface: | RGB_24 bit |
| Viewing Direction: | ALL |
| Surface Treatment: | Anti-Glare |
| Operating Temperature: | -30~+85°C |
| Storage Temperature: | -30~+85°C |
1.1 Block Diagram
1.2 Terminal Functions
| Pin No. | Pin Name | I/O | Descriptions |
|---|---|---|---|
| 1 | VLED- | ||
| P | Backlight LED Cathode supply | ||
| 2 | VLED- | ||
| 3 | VLED+ | ||
| P | Backlight LED Anode supply | ||
| 4 | VLED+ | ||
| 5 | NC | ||
| 6 | NC | – | NC |
| 7 | NC | ||
| 8 | /RST | I | SYSTEM Reset pin. 3.3V. low is active |
| 9 | /SPEN | I | Serial communication chip selection. |
| 10 | SPCK | I | Serial communication clock input. |
| 11 | SPDA | I/O | Serial communication data input and output. |
| 12 | DO | ||
| . | . | I10 | Blue data input |
| 19 | D7 | ||
| 20 | D8 | ||
| . | I/O | Green data input | |
| 27 | D15 | ||
| 28 | D16 | ||
| . | . | I/O | Read data input |
| 35 | D23 | ||
| 36 | HSYNC | I | Horizontal sync signal. |
| 37 | VSYNC | I | Vertical sync signal. |
| 38 | DCLK | I | Pixel clock input pin. |
| 39 | NC | – | NC |
| 40 | NC | ||
| 41 | VDD | P | Power supply. |
| 42 | VDD | ||
| 43 | NC | ||
| 44 | NC | ||
| 45 | NC | ||
| 46 | NC | ||
| 47 | NC | – | NC |
| 48 | NC | ||
| 49 | NC | ||
| 50 | NC | ||
| 51 | NC | ||
| 52 | DEN | I | Data input enable. Display access is enabled when DE is “H”. |
| 53 | GND | ||
| P | Power Ground Supply | ||
| 54 | GND |
**Note:***
1.I——Input，
O——Output，
P——Power/Ground.
Absolute Maximum Ratings
| Items | Symbol | Min. | Max. | Unit | Condition |
|---|---|---|---|---|---|
| Supply Voltage | VDD | 0. | +4.0 | V | GND = OV |
| Input Voltage | VIN | 0. | +4.0 | V | GND = OV |
| Operating Temperature | TOP | -30 | +85 | °C | No Condensation |
| Storage Temperature | Tsr | -30 | +85 | °C | No Condensation |
Note: Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
Electrical Characteristics
3.1 DC Characteristics
GND=OV, VDD =3.3V, Top =25°C
Items| Symbol| MIN.| TYP.| MAX.| Unit|
Applicable Pin
---|---|---|---|---|---|---
Operating Voltage| VDD| 3.0| 3.| 4.| V| VDD
Input High Voltage| VIII| 0.7xVDD| –| GND| V| Input pins
Input Low Voltage| VIL| GND| –| 0.3xVDD| V| Input pins
Operating Current| IDD| –| 25| –| mA| Displon on Static VDD=3.3V
Without Backlight
3.2 LED Backlight Circuit Characteristics
If LED ANoDE=20mA, Top=25°C
| Items | Symbol | MIN. | TYP. | MAX. | Unit | Note |
|---|---|---|---|---|---|---|
| Forward Voltage | Vf | – | 19. | – | V | |
| Forward Current | If | – | 40 | – | mA | |
| Life Time | L | – | 50000 | – | hr |
Note: Exceeding the recommended driving current could cause substantial
damage to the backlight and shorten its life time.
3.3 Block Diagram
LCD module diagram
AC Characteristics
4.1 RGB Interface
4.1.1 System Bus Timing for RGB Interface
item| Symbol| MM.| Typ.| Max.| Unit|
Conditions
---|---|---|---|---|---|---
CLK Pulse Duty| Tclk| 40| 50| 60| %|
HSYNC Width| Thw| 2| –| | DCLK|
VSYNC Setup Time| Tvst| 12| | –| ns|
VSYNC Hold Time| Tvhd| 12| | | ns|
HSYNC Setup Time| Thst| 12| | | ns|
HSYNC Hold Time| Thhd| 12| –| | ns|
Data Setup Time| Tdsu| 12| –| –| ns|
Data Hold Time| Tdhd| 12| –| | ns|
DE Setup Time| Tdest| 12| | –| its|
DE Hold Time| Tdehd| 12| –| | ns|
4.1.2 SYNC-DE Mode
Parallel
RGB Input Timing Table
Parallel 24-bit RGB Input Timing (PVDD=VDD=VDDI= 3.3V. AGND= OV. TA=25 C)
Parallel 24-bit RGB Input Timing Table
Item| Symbol| MM.| Typ.| Max.| Unit| Note
DCLK Frequency| Fclk| 5| 6| 8| MHz|
DCLK Period| Tclk| 125| 167| 200| ns|
HSYNC| Period Time| Th| 325| 371| 438| DCLK|
Display Penod| Thdisp| | 320| | DCLK|
Back Porch| Th bp| 3| 43| 43| DCLK| Thbp of SYNC mode set by
11_BLANKINGt7 0]
Front Porch| Thfp| 2| 8| 75| DCLK|
Pulse Width| Thw| 2| 4| 43| DCLK|
VSYNC| Period Time| Tv| 244| 260| 289| HSYNC|
Display Penod| Tvd sp| | 240| | HSYNC|
Back Path| Tvbp| 2| 12| 12| HSYNC| Tvbp of SYNC mode sot by V_BLANKINGt7 03
Front Porch| Tvfp| 2| 8| 37| HSYNC|
Pulse Width| Tvw| 2| 4| 12| HSYNC|
Note if ,is necessary to keep Tvbp =12 and Thbp =43 in sync mode. DE mode is unnecessary to keep it.
4.2 POWER ON/OFF SEQUENCE
4.2.1 Power On Sequence
| Symbol | Desation | Min. Time | Unit |
|---|---|---|---|
| TO | System power stability to GRB RESET signal | 0 | ms |
| T1 | GRB RESET= “High” to DISR=1-ligh” | 10 | ms |
| T2 | Display Signal output to Backlight Power on | 250 | ms |
Note: Display signal DCLK. VSYNC: HSYNC: DE. DR(7.01: DG(7.01. 08(7:0)
4.2.2 Power Off Sequence
| Symbol | Description | Min. Time | Unit |
|---|---|---|---|
| TO | Backlight Power off to DISP=”Lovi | 5 | ms |
| Tt | DISP=”Low- to IC internal voltage discharge complete | 80 | ms |
Symbol Description Min. Time Unit TO Backlight Power off to DISP=”Lovi 5 ms Tt
DISP=”Low- to IC internal voltage discharge complete 80 ms
Note: Display signal DCLK, VSYNC. NSYNC. OE. DAV DGf7 OB17 Of
Optical Characteristics
Ta=25°C
Item| Symbol| Condition| MM| Typ| Max|
Unit| Remark
---|---|---|---|---|---|---|---
View Angles| OT| CRa.10| 70| 80| –| Degree| Notel3
OB| 70| 80| –
et_| 70| 80| –
OR| 70| 80| –
Contrast Ratio| CR| 0=0°| 640| 800| –| | Note 3
Response Time| Tr.TF| 0=0°| –| 30| 40| msec| Note 4
Chromaticity| White| x| Backlight
is on| 0.279| 0.319| 0.359| | Note 1,5
Y| 0.259| 0.299| 0.339
Red| x| | TBD| | Note 1.5
Y| | TBD|
Green| x| | TBD| | Note 1,5
Y| | TBD|
Blue| x| | TBD| | Note 1,5
Y| | TBD|
Uniformity| U| 80| –| –| %| Note 6
NTSC| –| | | –| %| Note 5
Luminance| L| 900| 1000| –| cd/m2| Note 7
TestConditions:
- IF=40mA, and the ambient temperature is 25℃
- The test systems refer to Note1 and Note2.
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 (TON) is the time between
photo detector output intensity changed from 90% to 10%. And fall time (TOFF)
is the time between photo detector output intensity changed from 10% to
90%.
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 .
Every measuring point is placed at the center of each measuring area.
Luminance Uniformity (U) : 
Note 7: Definition of Luminance:
Measure the luminance of white state at center point.
LCD Module Design and Handling Precautions
– Please ensure VO, VCOM is adjustable, to enable LCD module get the best
contrast ratio under different temperatures, view angles and positions.
– Normally display quality should be judged under the best contrast Tatio
within viewable ares. Unexpected display pattem may com out under abnormal
contrast ratio.
– Never operate the LCD module exceed the absolute maximum ratings.
– Never apply signal to the LCD module without power supply.
– Keep signal line as short as possible to reduce external noise
interference.
– IC chip (e.g. TAB or COG) és sensitive to light. Strong light might cause
malfunction. Light sealing structure casing ts recommended.
– Make sure there is enough space (with cushion) between case and LCD panel,
to prevent extemal force passed on to the panel: otherwise that may cause
damage to the LCD and degrade its display result.
– Avoid showing a display pattern on screen for a long time (continuous ON
segment).
– LCD module reliability may be reduced by temperature shock.
– When storing and operating LCD module, avoids exposure to direct sunlight,
high humidity, high or low temperature. They may damage or degrade the LCD
module.
– Never leave LCD module in extreme condition (max./min storage/operate
temperature) for more than 48hr.
– Recommend LCD module storage conditions is 0 C-40 C <80%RH.
– LCD module should be stored in the room without acid, alkali and harmful
gas.
– Avoid dropping & violent shocking during transportation, and no excessive
pressure press, moisture and sunlight.
– LCD module can be easily damaged by static electricity. Please maintain an
optimum anti-static working environment to protect the LCD module. (eg. ground
the soldering irons properly)
– Be sure to ground the body when handling LCD module.
– Only hold LCD module by its sides. Never hold LCD module by applying force
on the heat seal or TAB.
– When sokdering. control the temperature and duration avoid damaging the
backlight guide or diffuser which might degrade the display result such as
uneven display.
– Never bet LCD module contact with corrosive liquids, which might cause
damage to the backlight guide or the electric circuit of LCD module.
– Only clean LCD with a soft dry cloth. Isopropyl Alcohol or Ethy! Alcohol.
Other solvents (e.g. water) may damage the LCD.
– Never add force to components of LCD module. It may cause invisible damage
or degrade the module’s reliability.
– When mounting LCD module, please make sure it is free from twisting. warping
and bending.
– Do not add excessive force on surface of LCD, which may cause the display
color change abnormally.
– LCD panel is made with glass. Any mechanical shock (6.9. dropping from high
place) will damage the LCD module.
– Protective film is attached on LCD screen. Be careful when peeling Off this
protective film, since static electricity may be generated.
– Polarizer on LCD gets scratched easily. If possible. do not remove LCD
protective film until the last step of installation.
– When peeling off protective film from LCD, static charge may cause @bnormal
display pattern. The symptom is normal, and it will turn back to normal in a
short while.
– LCD panel has sharp edges, please handle with care.
– Never attempt to disassemble or rework LCD madule.
– If display panel is damaged and liquid crystal substance 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.
Warranty
This product has been manufactured to our company’s specifications as a part
for use in your company’s general electronic products. It is guaranteed to
perform according to delivery specifications. For any other use apart from
general electronic equipment. we cannot take responsibility if the product is
used in medical devices, nuclear power control equipment. aerospace equipment,
fire and security systems, or any other applications in which there is a
direct tisk to human life and where extremely high levels of iability are
required. If the product is to be used in any of the above applications, we
will need to enter into a separate product liability agreement.
– We cannot accept responsibility for any defect, which may arise form
additional manufacturing of the product (including disassembly and
reassembly). after product delivery.
– We cannot accept responsibility for any defect. which may arise after the
application of strong extemal force to the product.
– We cannot accept responsibility for any defect, which may arise due to the
application of static electricity after the product has passed our company’s
acceptance inspection procedures.
– When the product is in CCFL modets, CCFL service life and brightness will
vary sccording to the performance of the inverter used. leaks, etc. We cannot
accept responsibility for product performance. reliability. or defect. which
may arise.
– We cannot accept responsibdity for intellectual property of a third part.
which may arise through the application of our product to our assembly with
exception to those issues relating directty to the structure or method of
manufacturing of our product.
References
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