TOPWAY LMT028ENHFWA-NAN-1 LCD Module User Manual

TOPWAY LMT028ENHFWA-NAN-1 LCD Module

Product Information: LCD Module User Manual – LMT028ENHFWA-NAN-1

The LCD Module User Manual provides detailed information on the LMT028ENHFWA- NAN-1 LCD module. The manual includes general specifications, absolute maximum ratings, electrical characteristics, functions, optical characteristics, LCD module design and handling precautions, CTP mounting instructions, and RTP mounting instructions. The LCD module has a screen size of 320 x 240 (RGB) pixels with a TFT panel display technology and a color depth of pixel pitch. The display interface includes SDA (D0), SDO (D1)~D7, D/C(/WR), SCL(D/C), /CS, /RES, FMARK, /RD with TFT Driver ST7789VI or equivalent.

Product Usage Instructions

1. Read the LCD Module User Manual carefully before using the LMT028ENHFWA-NAN-1 module.
2. Ensure that the power supply is connected correctly with VSS and VDD terminals.
3. Use BLEN pin to turn on/off the backlight. Set I BLEN = H for turning off the backlight and I BLEN = L for turning on the backlight.
4. Fix pin NC(/RD) at IOVDD and use it as a read enable input (active low).
5. Use pin D/C (/WR) as a write enable input (active low) and display data/command selection pin in 4-line serial interface.
6. Follow the instructions provided in the manual to mount CTP and RTP properly.
7. Handle the LCD module with care and follow the precautions mentioned in the manual to avoid damage to the module.
8. Ensure to maintain the operating temperature and storage temperature within the specified range.

General Specifications

• Screen Size(Diagonal) : 2.8”
• Active Area : 57.6×43.2 mm
• Number of dots : 320 x 240(RGB)
• Pixel Pitch： 0.18×0.18 mm
• Color Depth: 65k colors
• Display Technology : a-Si TFT active matrix
• Display Mode : Normal Black, Transmissive
• Display Interface : SPI（MCU 8bit）
• Viewing Direction : Full View
• Touch Panel : –
• Surface Treatment : HC
• Touch Interface: –
• Operating Temperature : -20 ~ +70°C
• Storage Temperature : -30 ~ +80°C

Note:
Color tone may slightly change by temperature and driving condition.

Block Diagram

Terminal Functions

Pin No.

(K1)

| Pin No. (K2)| ****

Pin    Name

| ****

I/O

| Descriptions
---|---|---|---|---
80-8bit| 4-SPI (default)
1| 1| VSS| P| Negative power supply,0V.
2| 2| VSS

3

| ****

3

| ****

BLEN

| ****

I

| Backlight enable

BLEN = H: turn off Backlight. BLEN = L: turn on Backlight.     *1

4| 4| VDD| P| Positive power supply.
5| 5| VDD
6| 6| NC(/RD)| I| Read enable input, active low.| Please fix this pin at IOVDD.

7

| ****

7

| ****

D/C (/WR)

| ****

I

| Write enable input, active low.| Display data/command selection pin in 4-line

serial interface.

8

| ****

8

| ****

SCL(D/C)

| ****

I

| Register Select

D/C=H, Transferring the Display Data.

D/C = L, Transferring the Control Data.

| ****

This pin is used to be serial interface clock.

9

| ****

9

| ****

/CS

| ****

I

| Chip Select

/CS=L, enable access to the LCD module.

/CS=H, disable access to the LCD module.

10

| ****

10

| ****

SDA (D0)

| ****

I/O

| ****

Data Input.

| The data is latched on

the rising edge of the SCL signal.

11

| ****

11

| ****

SDO (D1)

| ****

I/O

| SPI interface output pin. The data is output on the rising edge of the

SCL signal.

12| 12| NC(D2)| I/O| Please fix this pin at IOVDD or GND level.
:| :| :| :
17| 17| NC(D7)| I/O

18

| ****

18

| ****

/RES

| ****

I

| Reset signal

/RES = L, Initialization is executed.

/RES = H, Normal running.

19| 19| NC(FMARK)| O| Displaying Timing Frame Signal.
20~28| 20~30| NC| –| –

The PWM frequency is between 2k Hz and 10kHz.

Absolute Maximum Ratings

Any Stresses exceeding the Absolute Maximum Ratings may cause substantial damage to the device. Functional oper-ation 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

Items| Symbo

l

| MIN.| TYP.| MAX.| Unit| Condition /

Application Pin

---|---|---|---|---|---|---
Operating Voltage| VDD| 4.8| 5.0| 5.2| V| VDD
IOVDD| 3.2| 3.3| 3.4| V| IOVDD
Input High Voltage| VIH| 0.7* IOVDD| –| IOVDD| V| /RES, SDA (D0),D1~D7,

/CS,/RD,/WR,BLEN, D/C(SCL)

Input Low Voltage| VIL| 0| –| 0.3 IOVDD| V
Output High Voltage| VOH| 0.8 IOVDD| –| IOVDD| V| D0~D7, SDO,FMARK
Output Low Voltage| VOL| 0| –| 0.2* IOVDD| V
Operating Current| IDD| –| 80| –| mA| Backlight are ON
IDD| –| 10| –| mA| Backlight are OFF

AC Characteristics
4 line SPI Timing

VDD =5V, VSS=0V, TOP=25℃

Note : The rising time and falling time (Tr, Tf) of input signal are specified at 15 ns or less. Logic high and low levels are specified as 30% and 70% of VDDI for Input signals.

8080 Mode System Bus Timing

VDD =5V, VSS=0V, TOP=25℃

Signal| Symbo l| Parameter| Spec.| Unit| Description
---|---|---|---|---|---
Min.| Max.
D/C| TAST| Address setup time| 5| –| ns| –
TAHT| Address hole time(Write/Read)| 13| –

/CS

| TCHW| Chip select “H” pulse width| 5| –|

ns

|

–

TCS| Chip select setup time(Write)| 20| –
TRCS| Chip select setup time(Read ID)| 60| –
TRCSFM| Chip select setup time(Read FM)| 460|
TCSF| Chip select wait time(Write/Read)| 13|
TCSH| Chip select hold time| 13|

/WR

| TWC| Write cycle| 86| –|

ns

|

–

TWRH| Control pulse “H” duration| 20| –
TWRL| Control pulse “L” duration| 20| –
 | TDST| Data setup time| 13| –|  | For maximum CL=30pF

For minimum CL=8pF

 | TDHT| Data hold time| 13| –|
DB[7:0]| TRAT| Read access time(ID)| –| 52| ns
 | TRATFM| Read access time(FM)| –| 442|
 | TODH| Ouput disable time| 14| 104|

/RD(ID)

| TRC| Read cycle(ID)| 208|  |

ns

|

When read ID data

TRDH| Control pulse “H” duration(ID)| 120|
TRDL| Control pulse “H” duration(ID)| 60|

/RD(FM)

| TRCFM| Read cycle(FM)| 585|  | When read from frame memory
TRDHFM| Control pulse “H” duration(FM)| 120|
TRDLFM| Control pulse “H” duration(FM)| 460|

Note:

• Input signal rise/fall time should be less than 15ns.
• All timing is using 20% and 80% of VDD as the reference.
• Please refer to ST7789VI datasheet for details

Reset Timing

VCC=3.3V, GND=0V, TOP=25℃

Functions

Display Commands

Notes:

1. There will be no abnormal visible effects on the display when S/W or H/W Reset are applied.
2. Please refer to ST7789VI datasheet for details

Power off the LCD Module
It recommends that enter Sleep Mode before power off the LCD module.

Refreshing The LCD Module
It recommends that the operating modes and display contents be refreshed periodically to prevent the effect of unexpected noise.

 Optical Characteristics

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

View Angles

| θT| ****

CR≧10

| 70| 80| –| ****

Degree

| ****

Note2

θB| 70| 80| –
θL| 70| 80| –
θR| 70| 80| –
Contrast Ratio| CR| θ= 0°| 600| 800| –|  | Note 3

Response Time

| TON| ****

25℃

| ****

–

| ****

25

| ****

35

| ****

ms

| ****

Note 4

TOFF

Chromaticity

| ****

White

| x| ****

Backlight is on

| 0.237| 0.287| 0.337|  | ****

Note 1,5

y| 0.265| 0.315| 0.365

Red

| x| 0.586| 0.636| 0.686|
y| 0.286| 0.336| 0.386

Green

| x| 0.285| 0.335| 0.385|
y| 0.564| 0.614| 0.664

Blue

| x| 0.099| 0.149| 0.199|
y| 0.021| 0.071| 0.121
Uniformity| U|  | 75| 80| –| %| Note 6
NTSC| S| Θ= 0°

Φ=0o

| 65| 70| –| %| Note 5
Luminance| L| 230| 280| –| cd/㎡| Note 7

Test Conditions:

1. the ambient temperature is 25℃.
2. The test systems refer to Note 1 and Note 2.

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.

Measuring surroundings: Dark room
Measuring temperature: Ta=25℃.

Note 2: Definition of viewing angle range and measurement system. The definition of viewing angle:
Refer to the graph below marked by θ and Ф

Note 3: Definition of contrast ratio
The definition of contrast ratio (Test LCM using SR-3A (1°)):

(Contrast Ratio is measured in optimum common electrode voltage)

Note 4: Definition of Response time
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) Definition of Color of CIE1931 Coordinate and NTSC Ratio.
Color gamut:

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) = Lmin/ Lmax
L——-Active area length W—– Active area width
Lmax: The measured Maximum luminance of all measurement position.
Lmin: The measured Minimum luminance of all measurement position.

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

LCD Module Design and Handling Precautions

• Please ensure V0, 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 ratio within viewable area. Unexpected display pattern may come 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) 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 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 soldering, control the temperature and duration 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 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 (e.g. 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 abnormal 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 module.
• 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.

CTP Mounting Instructions

Bezel Mounting (Figure 1)

• – The bezel window should be bigger than the CTP active area. It should be≥0.5mm each side.
  – Gasket should be installed between the bezel and the CTP surface. The final gap should be about 0.5~1.0mm.
  – It is recommended to provide an additional support bracket for backside support when necessary (e.g. slim type TFT module without mounding structure). They should only provide appropriate support and keep the module in place.
  – The mounting structure should be strong enough to prevent external uneven force or twist act onto the module.

Surface Mounting (Figure 2)

• As the CTP assembling on the countersink area with double side adhesive.
  The countersink area should be flat and clean to ensure the double side adhesive installation result.

• The Bezel is recommend to keep a gap (≥0.3mm each side) around the cover lens for tolerance.

•  It is recommended to provide an additional support bracket with gasket for backside support when necessary (e.g. TFT module without mounding structure). They should only provide appropriate support and keep the module in place.

• The mounting structure should be strong enough to prevent external uneven force or twist act onto the module

Additional Cover Lens Mounting (Figure 3)

• For the case of additional cover Lens mounting, it is necessary to recheck with the CTP specification about the material and thickness to ensure the functionality.
• It should keep a 0.2~0.3mm gap between the cover lens and the CTP surface..
• The cover lens window should be bigger than the active area of the CTP.It should be≥0.5mm each side.
• It is recommended to provide an additional support bracket for backside support when necessary (e.g. slim type TFT module without mounding structure). They should only provide appropriate support and keep the module in place.
• The mounting structure should be strong enough to prevent external uneven force or twist act onto the module.

RTP Mounting Instructions

• It should bezel touching the RTP Active Area (A.A.) to prevent abnormal touch.It should left gab D=0.2~0.3mm in between. (Figure 4)

• Outer bezel design should take care about the area outside the A.A. Those areas contain circuit wires which is having different thickness. Touching those areas could de-form the ITO film. As a result bezel the ITO film be damaged and shorten its lifetime.
  It is suggested to protect those areas with gasket (between the bezel and RTP).The suggested figures are B≥0.50mm; C≥0.50mm. (Figure 4)

• The bezel side wall should keep space E= 0.2 ~ 0.3mm from the RTP.(Figure 4)

• In general design, RTP V.A. should be bigger than the TFT V.A. and RTP A.A. should be bigger than the TFT A.A.(Figure 5)

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, which 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 exception to those issues relating directly to the structure or method of manufacturing of our product.

URL: www.topwaydisplay.com

References

• 液晶显示模块-7寸显示屏-2.8寸显示屏-液晶屏厂家 | 拓普微科技
• 液晶显示模块-7寸显示屏-2.8寸显示屏-液晶屏厂家 | 拓普微科技

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