LMT020EAAFWA

LMT020EAAFWA

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Wangxiao

Date: 2025-03-13

Date:

Rev. Descriptions

Edit

Release Date

0.1

Preliminary new release

Wangxiao

2025-03-13

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Table of Content

1 General Specifications.................................................................................................................... 3

1.1 Block Diagram..................................................................................................................................................................3

1.2 Terminal Functions...........................................................................................................................................................3

2 Absolute Maximum Ratings............................................................................................................5

3 Electrical Characteristics................................................................................................................ 5

3.1 DC Characteristics........................................................................................................................................................... 5

3.2 LED Backlight Circuit Characteristics...............................................................................................................................5

3.3 AC Characteristics............................................................................................................................................................6

4 Functions.......................................................................................................................................... 9

4.1 Display Commands.......................................................................................................................................................... 9

4.2 Power off the LCD Module............................................................................................................................................. 14

4.3 Refreshing The LCD Module..........................................................................................................................................14

5 Optical Characteristics..................................................................................................................15

6 LCD Module Design and Handling Precautions.........................................................................17

Warranty............................................................................................................................................. 18

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1 General Specifications

Screen Size(Diagonal) :

2.0”

Active Area :

40.8 x 30.6 (mm)

Number of dots :

320 x 240(RGB)

Pixel Pitch ：

0.1275 x 0.1275(mm)

Color Depth:

262k colors

Display Technology :

a-Si IPS

Display Mode :

Normal Black, Transmissive

Display Interface :

MCU_8bit/4-SPI

Viewing Direction :

FULL

Operating Temperature :

-20 ~ +70°C

Storage Temperature :

-30 ~ +80°C

Note:

*1. Color tone may slightly change by Temperature and Driving Condition.

1.1 Block Diagram

LED-A

LED-K1,LED-K2,LED-K3,LED-K4

Backlight Circuit

320 x 240(RGB) pixels

TFT Panel

DB0~DB7,SDA

VDD, GND

TFT Driver

/RESET,/CS,D/C(SPI-SCL),/WR(SPI-RS),/RD

ST7789T3 or equivalent

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1.2 Terminal Functions

Descriptions

No.

Pin Name

I/O

80_8bit

4-SPI

GND

Negative power supply,(0V)

VDD

Positive power supply

IM2

IM1 MPU Interface Mode Data pin

80_8bit

DB[7:0]

IM1

4-SPI

SDA

Reset signal

/RESET

/RST = L, Initialization is executed

/RST = H, Normal running

Chip Select

/CS

/CS=L, enable access to the LCD module

/CS=H, disable access to the LCD module

D/C(SPI-SCL)

D/C = H, Transferring the Display Data Serial clock input

D/C = L, Transferring the Control Data

/WR=L  H, RD=H;

SPI-RS = H,

/WR(SPI-RS)

Transferring the Display Data

Write enable in 80_8bit

SPI-RS = L,

Transferring the Control Data

/WR=H, /RD=L  H;

/RD

Not used,

Read enable in 80_8bit

please fix this pin at VDD or GND

SDA

I/O

Not used,

please fix this pin at VDD or GND

SPI interface input/output

DB0

I/O

DB1

I/O

DB2

I/O

DB3

I/O

Data bus

Not used,

DB4

I/O

please fix this pin at VDD or GND

DB5

I/O

DB6

I/O

DB7

I/O

LED-A

LED backlight(Anode)

LED-K1

LED backlight(Cathode)

LED-K2

LED backlight(Cathode)

LED-K3

LED backlight(Cathode)

LED-K4

LED backlight(Cathode)

GND

Negative power supply,(0V)

GND

Negative power supply,(0V)

Note:

*1. I —— Input ， O —— Output ， P —— Power/Ground.

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2 Absolute Maximum Ratings

Items

Symbol

Min.

Max.

Unit Condition

Supply Voltage

V DD

-0.3

+4.6

Operating Temperature

T OP

-20

+70

 C

No Condensation

Storage Temperature

T ST

-30

+80

 C

No Condensation

Note:

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

*2. The operating temperature only guarantees operation of the circuit. The contrast, response speed,

and the other specification related to electro-optical display quality is determined at the room temperature, T OP =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 reliabilit.

3 Electrical Characteristics

3.1 DC Characteristics

VSS=0V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Condition /

Application Pin

Operating Voltage

VDD

2.4

2.8

3.3

VDD

Input High Voltage

V IH

0.7 x VDD

VDD

DB0~DB7,SDA,/RESET

Input Low Voltage

V IL

VSS

0.3 x VDD

,/CS,D/C(SPI-SCL),

Output High Voltage

V OH

0.8 x VDD

VDD

/WR(SPI-RS),/RD

Output Low Voltage

V OL

VSS

0.2 x VDD

Operating Current

I DD

11.7

mA White pattern

3.2 LED Backlight Circuit Characteristics

T OP =25  C

Items

Sy mbol

MIN.

TYP.

MAX.

Unit Note

Forward Voltage

V f

3.2

Note 4

Forward Current

I f

mA Note 1,2

Backlight Power

Consumption

W BL

256

mW For total LEDs

Life Time

20000

30000

Note 1,2,3,4

Note1: The LED driving condition is defined for each LED module (1 LED Serial, 4LED 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 ℃ only If 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.

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3.3 AC Characteristics

3.3.1 80_8bit System Bus Timing

VDD =2.4 to 3.3V, VSS=0V, T OP =25  C

Signal

Symbol

Parameter

Spec.

Min.

Max.

Unit

Description

Address setup time

D/C

T AST

T AHT

Address hole time(Write/Read)

T CHW

Chip select “H” pulse width

T CS

Chip select setup time(Write)

Chip select setup time(Read ID)

/CS

T RCS

T RCSFM Chip select setup time(Read FM)

355

T CSF

Chip select wait time(Write/Read)

T CSH

Chip select hold time

T WC

Write cycle

/WR

T WRH

Control pulse “H” duration

T WRL

Control pulse “L” duration

T DST

Data setup time

T DHT

Data hold time

DB[7:0]

T RAT

Read access time(ID)

For CL=30pF

T RATFM Read access time(FM)

340

T ODH

Ouput disable time

T RC

Read cycle(ID)

160

/RD(ID)

When read

T RDH

Control pulse “H” duration(ID)

ID data

T RDL

Control pulse “H” duration(ID)

T RCFM Read cycle(FM)

450

/RD(FM)

When read from

T RDHFM Control pulse “H” duration(FM)

Frame menory

T RDLFM Control pulse “H” duration(FM)

355

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. All timing is using 30% and 70% of VDD as the reference.

*3. Please refer to ST7789T3 datasheet for details

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3.3.2 4-SPI Mode System Bus Timing

VDD =2.4 to 3.3V, VSS=0V, T OP =25  C

Signal

Symbol

Parameter

Spec.

Min.

Max.

Unit

Description

T CSS

Chip select setup time (write)

T CSH

Chip select hold time (write)

C/S

T SCC

Chip select setup time (read)

T SCC

Chip select hold time (read)

T CHW

Chip select “H” pulse width

T SCYCW

Serial clock cycle (Write)

T SHE

SPI-SCL “H” pulse width (Write)

write command

& data ram

T SLW

SPI-SCL “L” pulse width (Write)

SPI-SCL

T SCYCR Serial clock cycle (Read)

180

T SHR

SPI-SCL “H” pulse width (Read)

read command

& data ram

T SLR

SPI-SCL “L” pulse width (Read)

T DCS

SPI-RS setup time

SPI-RS

T DCH

SPI-RS hold time

T SDS

Data setup time

SDA

T SDH

Data hold time

T ACC

Access time

for maximum

DOUT

CL=30pF

T OH

Output disable time

for minimum

CL=8pF

Note:

*1. Input signal rise/fall time should be less than 15ns .

*2. All timing is using 30% and 70% of VDD as the reference.

*3.In the read sequence of serial interface, the 500nsec delay time is needed between read command and first read clock.

*4. Please refer to ST7789T3 datasheet for details

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3.3.3 Reset Timing

VDD =2.4 to 3.3V, VSS=0V, T OP =25  C

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset LOW pulse width

T RW

Reset time

T RT

120

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4 Functions

4.1 Display Commands

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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 ST7789T3 datasheet for details.

4.2 Power off the LCD Module

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

4.3 Refreshing The LCD Module

It recommends that the operating modes and display contents be refreshed periodically to prevent

the effect of unexpected noise.

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5 Optical Characteristics

VDD=5.0V, GND=0V, T OP =25  C

Item

Symbol Condition

Min

Typ

Max

Unit

Remark

θT

View Angles

θB

CR ≧ 10

Degree Note2,3

θL

θR

Contrast Ratio

θ= 0°

640

800

Note 3

T ON

Normal

Response Time

viewing

Note 4

T OFF

angle

0.238

0.288

0.338

White

0.248

0.298

0.348

0.567

0.617

0.667

Red

Chromaticity

Backlight is

0.303

0.353

0.403

Note 1,5

0.266

0.316

0.366

Green

0.517

0.567

0.617

0.101

0.151

0.201

Blue

0.032

0.082

0.132

Uniformity

Note 6

NTSC

Note 5

Luminance

250

300

cd/ ㎡ Note 7

Test Conditions:

*1. I f =80mA ， and the ambient temperature is 25 ℃ .

*2. The test systems refer to Note 1 and Note 2.

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Note 1:

Note 2:

The data are measured after LEDs are turned on for 5 minutes.

The definition of viewing angle:

LCM displays full white. The brightness is the average value of 9 Refer to the graph below marked by θ and Ф

measured spots. Measurement equipment PR-705

Measuring condition:

- Measuring surroundings: Dark room

- Measuring temperature: Ta=25 ℃ .

- Adjust operating voltage to get optimum contrast at

the center of the display.

Note 3:

The definition of contrast ratio (Test LCM using PR-705):

Note 4:

Contrast

Luminance When LCD is at “White” state

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

Ratio(CR)

Luminance When LCD is at “Black” state

The output signals of photo detector are measured

(Contrast Ratio is measured in optimum common electrode

when the input signals are changed from

voltage)

“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

figure as below.

Note 5:

Note 6:

Definition of Color of CIE1931 Coordinate and NTSC Ratio.

The luminance uniformity is calculated by using following formula.

△ Bp = Bp (Min.) / Bp (Max.)×100 (%)

Color gamut:

Bp (Max.) = Maximum brightness in 9 measured spots

Area of RGB triangle

X100%

Bp (Min.) = Minimum brightness in 9 measured spots .

Area of NTSC triangle

Note 7:

Measured the luminance of white state at center point

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6 LCD Module Design and

6 液晶显示模块设计和使用须知

Handling Precautions

- Please ensure V0, VCOM is adjustable, to enable LCD -

请注意 V0, VCOM 的设定, 以确保液晶显示模块在不同

module get the best contrast ratio under different

的使用温度下以及在不同的视角和位置观察模块显示，

temperatures, view angles and positions.

均能达到最佳对比度，请务必将应用电路上设置为对比

度可调。

- Normally display quality should be judged under the -

请注意液晶显示模块的显示品质判定是指在正常对比度

best contrast ratio within viewable area. Unexpected

下以及视窗(V.A)范围内进行的，非正常对比度下液晶

display pattern may com out under abnormal contrast

可能会出现非预期的显示不良，应注意区分。

ratio.

- Never operate the LCD module exceed the absolute -

请勿在最大额定值以外使用液晶显示模块。

maximum ratings.

- Never apply signal to the LCD module without power -

请勿在没有接通电源的条件下，给液晶显示模块输送信

supply.

号。（禁止热插拔）

（ No Hot-plugging ）

- WARNING! Be aware of (if any) frame grounding of the -

警告！使用前需评估液晶显示模块的金属框架/壳体地

LCD Module connection with the system which may

(如有)与整机关系和安全性(如：漏电安全性，等)。

cause safety issue(e.g. electric shock,etc).

- Keep signal line as short as possible to reduce external -

请尽可能缩短信号线的连接，以避免对液晶显示模块的

noise interference.

信号干扰。

- IC chip (e.g. TAB or COG) is sensitive to light. Strong -

集成电路因 IC 芯片(如 TAB 或 COG)对紫外线极为敏

light might cause malfunction. Light sealing structure

感，强光环境下可能会引起液晶显示模块功能失效，故

casing is recommended.

应采用不透光的外壳。

- Make sure there is enough space (with cushion) -

请在液晶显示模块与外壳之间保留足够的空间(可使用

between case and LCD panel, to prevent external force

衬垫)，以缓冲外力对液晶显示模块的损坏或因受力不

passed on to the panel; otherwise that may cause

均而产生的显示不匀等异常现象。

damage to the LCD and degrade its display result.

- Avoid showing a display pattern on screen for a long -

避免液晶显示屏在某一画面下长时间点亮，否则有出现

time (continuous ON segment).

残影的风险；请通过软件每隔一段时间改变一次画面。

- LCD module reliability may be reduced by temperature -

液晶显示模块的可靠性可能因温度冲击而降低。

shock.

- When storing and operating LCD module, avoids -

请勿在阳光直射、高湿、高温或低温下储存和使用液晶

exposure to direct sunlight, high humidity, high or low

显示模块，这将造成液晶显示模块的损坏或失效。

temperature. They may damage or degrade the LCD

module.

- Never leave LCD module in extreme condition -

请勿在极限环境(最大/最小存储/工作温度)下使用或放

(max./min storage/operate temperature) for more than

置液晶显示模块超过 48 小时以上。

48hr.

- Recommend LCD module storage conditions is - 液晶显示模块建议存储条件为: 0 ℃ ~40 ℃ <80%RH 。

0 ℃ ~40 ℃ <80%RH.

- LCD module should be stored in the room without acid, -

请勿让液晶显示模块存储于带有酸性,碱性,有害气体环

alkali and harmful gas.

境之中。

- Avoid

dropping

violent

shocking

during -

在运输过程中, 请勿让液晶显示模块跌落与猛烈震动,

transportation, and no excessive pressure press,

同时避免异常挤压,高湿度,与阳光照射。

moisture and sunlight.

- LCD module can be easily damaged by static -

液晶显示模块极易受静电损坏，请务必保证液晶显示模

electricity. Please maintain an optimum anti-static

块在防静电的工作环境中使用或保存。(如: 烙铁正确

working environment to protect the LCD module. (eg.

接地,等)

ground the soldering irons properly)

- Be sure to ground the body when handling LCD -

拿取液晶显示模块时需注意操作人员的接地情况。

module.

- Only hold LCD module by its sides. Never hold LCD -

请手持液晶显示模块的边沿取放模块，防止热压纸或

module by applying force on the heat seal or TAB.

TAB 部位受力。

- When soldering, control the temperature and duration -

焊接液晶模块时，请注意控制烙铁的温度、焊接时间，

avoid damaging the backlight guide or diffuser which

以免烫坏导光板或偏光片，导致显示不匀等不良现象发

might degrade the display result such as uneven

生。

display.

- Never let LCD module contact with corrosive liquids, -

请勿使用洗板水等腐蚀性液体接触液晶模块，以免腐蚀

which might cause damage to the backlight guide or

导光板或模块电路。

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the electric circuit of LCD module.

- Only clean LCD with a soft dry cloth, Isopropyl Alcohol -

仅可使用柔软的干布, 异丙醇或乙醇清洁液晶屏表面，

or Ethyl Alcohol. Other solvents (e.g. water) may

其他任何溶剂(如:水)都有可能损坏液晶模块。

damage the LCD.

- Never add force to components of LCD module. It may -

请勿挤压液晶显示模块上的元器件，以避免产生潜在的

cause invisible damage or degrade the module's

损坏或失效而影响产品可靠性。

reliability.

- When mounting LCD module, please make sure it is -

装配液晶显示模块时，请务必注意避免液晶显示模块的

free from twisting, warping and bending.

扭曲或变形。

- Do not add excessive force on surface of LCD, which -

请勿挤压液晶显示屏表面，这将导致显示颜色的异常。

may cause the display color change abnormally.

- LCD panel is made with glass. Any mechanical shock -

液晶屏由玻璃制作而成，任何机械碰撞(如从高处跌落)

(e.g. dropping from high place) will damage the LCD

均有可能损坏液晶显示模块。

module.

- Protective film is attached on LCD screen. Be careful -

液晶屏表面带有保护膜, 揭除保护膜时需要注意可能产

when peeling off this protective film, since static

生的静电。

electricity may be generated.

- Polarizer on LCD gets scratched easily. If possible, do -

因液晶显示屏表面的偏光片极易划伤，安装完成之前请

not remove LCD protective film until the last step of

尽量不要揭下保护膜。

installation.

- When peeling off protective film from LCD, static -

请缓慢揭除保护膜，在此过程中液晶显示屏上可能会产

charge may cause abnormal display pattern. The

生静电线，此为正常情况，可在短时间内消失。

symptom is normal, and it will turn back to normal in a

short while.

- LCD panel has sharp edges, please handle with care.

请注意避免被液晶显示屏的边缘割伤。

- Never attempt to disassemble or rework LCD module.

请不要试图拆卸或改造液晶显示模块。

- If display panel is damaged and liquid crystal -

当液晶显示屏出现破裂, 内部液晶液体可能流出; 相关

substance leaks out, be sure not to get any in your

液体不可吞吃, 绝对不可接触嘴巴, 如接触到皮肤或衣

mouth, if the substance comes into contact with your

服, 请使用肥皂与清水彻底清洗。

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, 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

Document Name: LMT020EAAFWA-Manual-Rev0.1.DOC

Page: 18 of 18