TOPWAY LMT029DNWFWA-NAN LCD Module User Manual

TOPWAY LMT029DNWFWA-NAN LCD Module

Product Usage Instructions

• The block diagram shows the connections for the LMT029DNWFWA-NAN LCD Module including the Backlight Circuit, TFT Panel, and various pins such as BL_PWM, VDD, VSS, R, G, B, DCLK, HS, VS, DE, and /RST.

FAQ

• Q: What is the color depth of the display?
• A: The color depth information is not provided in the user manual for the LMT029DNWFWA-NAN LCD Module.
• Q: How do I reset the device?
• A: To reset the device, you need to apply a signal to the /RST pin. This signal will reset the device and it must be applied to properly initialize the chip.

Prepared by:

Wangxiao

Date: 2024-01-29

| Checked by:

Date:

| Approved by:

Date:

---|---|---
Rev.| Descriptions| Edit| Release Date
---|---|---|---
0.1| Preliminary New release| Wangxiao| 2024-01-29
 |  |  |

General Specification

• Screen Size(Diagonal): 2.9”
• Active Area:   67.68 x 26.51 (mm)
• Number of dots:   960 x 376(RGB)
• Pixel Pitch: 0.0705 x 0.0253(mm)
• Color Depth: 8 colors
• Display Technology: a-Si TFT active matrix
• Display Mode: Normal Black, Transmissive
• Display Interface: RGB_3bit
• Viewing Direction: ALL
• Operating Temperature: -20 ~ +70°C
• Storage Temperature: -30 ~ +80°C

Note

1. Color tone may slightly change by Temperature and Driving Conditions.
2. The Color is defined as the inactive / background color

Block Diagram

Terminal Function

I/O

| ****

Data Input

6| G
7| B
8| DCLK| I| Data clock signal input
9| HS| I| Horizontal sync signal; negative polarity
10| VS| I| Vertical sync signal; negative polarity
11| DE| I| Data input enabled. Active High to enable the data input *2
12| /RST| I| This signal will reset the device and it must be applied to properly initialize the chip

Note

1. I——Input，O——Output，P——Power/Ground
2. In DE Mode(default), writing data to the line buffer is done by DCLK and Video Data Bus, when DE is high state. The external clocks (DCLK, VS, and HS) are used for internal displaying clocks. So, the controller must always transfer DCLK. VS and HS signal to the TFT driver IC.

Absolute Maximum Ratings

Note

1. This rating applies to all parts of the module and should not be exceeded.

2. The operating temperature only guarantees the operation of the circuit. The contrast, response speed,
   and other specifications related to electro-optical display quality is determined at room temperature, TOP=25℃

3. Ambient temperature when the backlight is lit (reference value)

4. 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

DC Characteristics

GND=OV, Top =25°C

Items| Symbol| MIN.| TYP.| MAX.| Unit| Applicable Pin
---|---|---|---|---|---|---
Analog operating voltage| VDD| 3.0| 3.3| 3.6| V| VDD
Input High Voltage| VIH| 0.7VDD| –| VDD| V| Input pins
Input Low Voltage| VIL| GND| –| 0.3VDD| V| Input pins
Operating Current| IDD| –| TBD| –| mA| VDD

LED Backlight Circuit Characteristics

Тор=25°С

Note

1. The LED driving condition is defined for each LED module (1 LED Serial,5 LED Parallel).
2. Under LCM operating, the stable forward current should be inputted. And forward voltage is for reference only.
3. Note3:Optical performance should be evaluated at Ta=25℃ only. If LED is driven by high current, high ambient temperature & humidity conditions, the lifetime of LED will be reduced. The LED Life-time is defined as the estimated time to 50% degradation of initial luminous under the condition of the ambient temperature of 25℃. Typical operating lifetime is estimated data. At the same time, the luminance of the Backlight would decrease under the hight temperature.
4. The LED driving condition is defined for each LED module.

AC Characteristics

Power ON/OFF Sequence

• Power-on sequence: VDD → /RST → DTAE → BL_PWM
• Power-off sequence: BL_PWM → DATE → /RST → VDD

RGB Interface

DCLK

| PWDH| DCLK High-level Pulse Width| 15| –| ns|
PWDL| DCLK Low-level Pulse Width| 15| –| ns|
TCYCD| DCLK Cycle Time| 33| –| ns|
Trghr, Trghf| DCLK Rise/Fall time| –| 15| ns|
DB| TPDS| PD Data Setup Time| 5| –| ns|
TPDH| PD Data Hold Time| 5| –| ns|

• The timing chart of RGB interface DE mode is shown as follows

Optical Characteristics

Item| Symbol| Condition| Min| Typ| Max| Unit| Remark
---|---|---|---|---|---|---|---

View Angles

| θT| ****

CR≧10

| 75| 85| –| ****

Degree

| ****

Note3,4

θB| 75| 85| –
θL| 75| 85| –
θR| 75| 85| –
Contrast Ratio| CR| θ=0°| 1000| 1500| –|  | Note 4

Response Time

| TON| ****

25℃

| ****

–

| ****

30

| ****

35

| ****

ms

| ****

Note 5

TOFF

Chromaticity

| ****

White

| x| ****

Backlight is on

| 0.229| 0.279| 0.329|  | ****

Note 1,6

y| 0.254| 0.304| 0.354

Red

| x| 0.534| 0.584| 0.634|  | ****

Note 1,6

y| 0.305| 0.355| 0.405

Green

| x| 0.275| 0.325| 0.375|  | ****

Note 1,6

y| 0.543| 0.593| 0.643

Blue

| x| 0.094| 0.144| 0.194|  | ****

Note 1,6

y| 0.021| 0.071| 0.121
Uniformity| U|  | 80| –| –| %| Note 2
NTSC|  |  | 55| 55.1| –| %| Note 6
Luminance| L|  | 250| 300| –| cd/㎡| Note 7

Note

1. IF=100mA, VF=3.3V and the ambient temperature is 25℃.(IF will change with voltage fluctuations, affecting the brightness of TFT)
2. The test systems refer to Note 1 and Note 2.

Note 1

• The data are measured after LEDs are turned on for 5 minutes. LCM displays full white. The brightness is the average value of 9 measured spots. Measurement equipment PR-705 (Φ8mm) Measuring condition:
  • Measuring surroundings: Darkroom
  • Measuring temperature: Ta=25℃.
  • Adjust the operating voltage to get optimum contrast at the center of the display.
• Measured value at the center point of LCD panel after more than 5 minutes while backlight turning on.

Note 2

• The luminance uniformity is calculated by using following formula.
  • △Bp = Bp (Min.) / Bp (Max.)×100 (%)
  • Bp (Max.) = Maximum brightness in 9 measured spots
• Bp (Min.) = Minimum brightness in 9 measured spots.

Note 3

• The definition of viewing angle:
• Refer to the graph below marked by θ and Ф

Note 4

• The definition of contrast ratio (Test LCM using PR-705): Contrast
• Ratio(CR)=
• Luminance When LCD is at “White” state
• Luminance When LCD is at a “Black” state (Contrast Ratio is measured in optimum common electrode voltage)

Note 5

• Definition of Response time. (Test LCD using DMS501):

• The output signals of the photodetector are measured when the input signals are changed from “black” to “white”(falling time)
  and from “white” to “black”(rising time), respectively.

• The response time is defined as the time interval between the 10% and 90% of amplitudes. Refer to the figure as below.

Note 6
Definition of Color of CIE Coordinate and NTSC Ratio.

Note 7: Definition of Luminance:
Measure the luminance of white state at center point.

LCD Module Design and Handling Precautions

• Please ensure V0, and VCOM is adjustable, to enable the LCD module get the best contrast ratio under different temperatures, view angles and positions.
• Normally display quality should be judged under the best contrast ratio within the viewable area. Unexpected display patterns may come out under an abnormal contrast ratio.
• Never operate the LCD module to exceed the absolute maximum ratings.
• Never apply a signal to the LCD module without a power supply.
• Keep the signal line as short as possible to reduce external noise interference.
• IC chip (e.g. TAB or COG) is sensitive to light. Strong light might cause malfunction. Light-sealing structure casing is recommended.
• Make sure there is enough space (with cushion) between case and LCD panel, to prevent external force from passing on to the panel; otherwise, that may cause damage to the LCD and degrade its display result.
• Avoid showing a display pattern on the screen for a long time (continuous ON segment).
• LCD module reliability may be reduced by temperature shock.
• When storing and operating LCD modules, avoid 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/operating temperature) for more than 48hr.
• Recommend LCD module storage conditions is 0 C~40 C <80%RH.
• LCD modules should be stored in a room without acid, alkali and harmful gas.
• Avoid dropping & violent shocking during transportation, and no excessive pressure press, moisture and sunlight.
• LCD modules 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 the LCD module.
• Only hold the LCD module by its sides. Never hold the LCD module by applying force on the heat seal or TAB.
• When soldering, control the temperature and duration to avoid damaging the backlight guide or diffuser which might degrade the display result such as uneven display.
• Never let 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 Ethyl Alcohol. Other solvents (e.g. water) may damage the LCD.
• Never add force to components of the LCD module. It may cause invisible damage or degrade the module’s reliability.
• When mounting the LCD module, please make sure it is free from twisting, warping and bending.
• Do not add excessive force on the surface of LCD, which may cause the display color to change abnormally.
• LCD panel is made of glass. Any mechanical shock (e.g. dropping from high place) will damage the LCD module.
• The protective film is attached on the LCD screen. Be careful when peeling off this protective film, since static electricity may be generated.
• The polarizer on the LCD gets scratched easily. If possible, do not remove the LCD protective film until the last step of installation.
• When peeling off protective film from LCD, a static charge may cause abnormal display patterns. The symptoms 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 the LCD module.
• If the display panel is damaged and a 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 risk to human life and where extremely high levels of reliability 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 external 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 models, CCFL service life and brightness will vary according to the performance of the inverter used, leaks, etc. We cannot accept responsibility for product performance, reliability, or defect, that may arise.
• We cannot accept responsibility for intellectual property of a third part, which may arise through the application of our product to our assembly with the exception to those issues relating directly to the structure or method of manufacturing of our product.

Note

1. LCD Display Type: TFT.Transmissive ‹Full View>

2. Operating Voltage: 3.3V

3. Backlight Color: White LEDs

4. Pixel Arrangement: RGB-STRIPE

5. Color Depth: 8 Colors

6. Interface: RGB_3bit

7. Connector :
   K1: P2.0,2x6Pin PCB Pad

8. Operating Temperature: -20°C~70°C

9. Storage Temperature: -30°C~80°C

www.topwaydisplay.com

References

• D.A.T.A. - durchschaubare IT für Radiologie
• 液晶显示模块-TFT液晶屏生产厂家 | 拓普微科技

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