LMT028ENHFWA-NAN-1

LMT028ENHFWA-NAN-1

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Gong huimei

Date: 2022-07-25

Date:

Rev.

Descriptions

Release Date

0.1

Preliminary New release

2022-07-25

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Table of Content

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

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

1.2 Terminal Functions ........................................................................................................................................................ 4

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

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

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

3.2 AC Characteristics ........................................................................................................................................................ 6

3.3 Reset Timing ................................................................................................................................................................. 8

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

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

4.2 Power off the LCD Module .......................................................................................................................................... 13

4.3 Refreshing The LCD Module ....................................................................................................................................... 13

5. Optical Characteristics ........................................................................................................ 14

6. LCD Module Design and Handling Precautions ................................................................ 16

7. CTP Mounting Instructions ................................................................................................. 17

8. RTP Mounting Instructions ................................................................................................. 18

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1. General Specifications

Screen Size(Diagonal) :

2.8 ”

Active Area :

57.6x43.2 mm

Number of dots :

320 x 240(RGB)

Pixel Pitch ：

0.18x0.18 mm

Color Depth:

65k colors

Display Technology :

a-Si TFT active matrix

Display Mode :

Normal Black, Transmissive

Display Interface :

RGB

Viewing Direction :

Full View

Touch Panel :

Surface Treatment :

Touch Interface:

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

BLEN

Backlight Circuit

320 x 240(RGB) pixels

TFT Panel

VSS

VDD

TFT Driver

SDA (D0), SDO (D1)~D7

ST7789VI or equivalent

D/C(/WR), SCL(D/C) , /CS,/RES, FMARK, /RD

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1.2 Terminal Functions

Descriptions

No.

Pin No.

Pin Name

I/O

(K1)

(K2)

80-8bit

4-SPI (default)

VSS

Negative power supply,0V

Backlight enable

BLEN

BLEN = H: turn off Backlight

BLEN = L: turn on Backlight

VDD

Positive power supply

NC(/RD)

Read enable input, active

Please fix this pin at

low

VDD

Display data/command

D/C (/WR)

Write enable input, active

low

selection pin in 4-line

serial interface.

D/C=H, Transferring the

SCL(D/C)

Display Data

This pin is used to be

D/C = L, Transferring the

serial interface clock.

Control Data

Chip Select

/CS

/CS=L, enable access to the LCD module

/CS=H, disable access to the LCD module

The data is latched on

SDA (D0)

I/O

the rising edge of the

SCL signal.

SPI interface output pin.

SDO (D1)

I/O Data Input

The data is output on

the rising edge of the

SCL signal.

NC(D2)

I/O

NC(D7)

I/O

Please fix this pin at

VDD or GND level.

Reset signal

/RES

/RES = L, Initialization is executed

/RES = H, Normal running.

NC(FMARK)

Displaying Timing Frame Signal

20~28

20~30

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

Mode

Install

No install

4-SPI

R10,R11(100R,0603,5%)

(default)

R12(0R,0603,5%)

R8,R13

80-8bit

R8,R13( 0R,0603,5%)

R10,R11,R12

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2. Absolute Maximum Ratings

VDD =5V, VSS=0V, T OP =25 ℃

Items

Symbol

Min.

Max.

Unit Condition

Supply Voltage

VDD

-0.3

+5.5

VSS= 0V

Input Voltage

V IN

-0.3

+4.6

VSS = 0V

Operating Temperature

T OP

-20

+70

 C

No Condensation

Storage Temperature

T ST

-30

+80

 C

No Condensation

Cautions:

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.

3. Electrical Characteristics

3.1 DC Characteristics

VDD =5V, VSS=0V, T OP =25 ℃

Items

Symbo

MIN.

TYP.

MAX.

Unit Condition /

Application Pin

Operating Voltage

VDD

4.8

5.0

5.2

VDD

IOVDD

3.2

3.3

3.4

IOVDD

Input High Voltage

V IH

0.7* IOVDD

IOVDD

/RES, SDA (D0),D1~D7,

Input Low Voltage

V IL

0.3* IOVDD

/CS,/RD,/WR,BLEN,

D/C(SCL)

Output High Voltage

V OH

0.8* IOVDD

IOVDD

D0~D7, SDO,FMARK

Output Low Voltage

V OL

0.2* IOVDD

Operating Current

I DD

Backlight are ON

I DD

Backlight are OFF

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3.2 AC Characteristics

4 line SPI Timing

VDD =5V, VSS=0V, T OP =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.

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8080 Mode System Bus Timing

VDD =5V, VSS=0V, T OP =25 ℃

Signal

Symbo

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)

460

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

For maximum

T DHT

Data hold time

CL=30pF

DB[7:0]

T RAT

Read access time(ID)

For minimum

CL=8pF

T RATFM

Read access time(FM)

442

T ODH

Ouput disable time

104

T RC

Read cycle(ID)

208

/RD(ID)

T RDH

Control pulse “ H ” duration(ID)

120

When read ID data

T RDL

Control pulse “ H ” duration(ID)

T RCFM

Read cycle(FM)

585

/RD(FM)

When read from

T RDHFM Control pulse “ H ” duration(FM)

120

frame memory

T RDLFM

Control pulse “ H ” duration(FM)

460

Note:

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

*2. All timing is using 20% and 80% of VDD as the reference.

*3. Please refer to ST7789VI datasheet for details

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3.3 Reset Timing

VCC=3.3V, GND=0V, T OP =25 ℃

Item

Symbol

MIN.

TYP.

MAX.

Unit

Reset LOW pulse width

t RW

Reset time

T RT

170

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4. Functions

4.1 Display Commands

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Notes:

There will be no abnormal visible effects on the display when S/W or H/W Reset are applied.

Please refer to ST7789VI 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

Item

Symbol

Condition

Min

Typ

Max

Unit

Remark

θT

View Angles

θB

CR ≧ 10

Degree

Note2

θL

θR

Contrast Ratio

θ = 0°

600

800

Note 3

T ON

Response Time

25 ℃

Note 4

T OFF

0.237

0.287

0.337

White

0.265

0.315

0.365

0.586

0.636

0.686

Red

Chromaticity

Backlight is

0.286

0.336

0.386

Note 1,5

0.285

0.335

0.385

Green

0.564

0.614

0.664

0.099

0.149

0.199

Blue

0.021

0.071

0.121

Uniformity

Note 6

NTSC

Θ= 0°

Note 5

Luminance

Φ=0 o

230

280

cd/ ㎡ Note 7

Test Conditions:

1. the ambient temperature is 25 ℃ .

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

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Note 1: Definition of optical measurement system.

Note 2: Definition of viewing angle range and measurement system.

The optical characteristics should be measured in dark room.

The definition of viewing angle:

After 5 Minutes operation, the optical

Refer to the graph below marked by θ and Ф

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 3: Definition of contrast ratio

Note 4: Definition of Response time

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

Definition of Response time.

Contrast

Luminance When LCD is at “White” state

The response time is defined as the LCD optical switching time

Ratio(CR)

Luminance When LCD is at “Black” state

inter val between “White” state and

(Contrast Ratio is measured in optimum common electrode

“ Black” state. Rise time (T ON ) is the time between photo detector

voltage)

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%.

Note 5: Definition of color chromaticity (CIE1931)

Note 6: Definition of Luminance Uniformity

Definition of Color of CIE1931 Coordinate and NTSC Ratio.

Active area is divided into 9 measuring areas (Refer Fig. 2). Every

measuring point is placed at the

Color gamut:

center of each measuring area.

Area of RGB triangle

Luminance Uniformity (U) = Lmin/ Lmax

X100%

Area of NTSC triangle

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

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6. LCD Module Design and Handling Precautions

6. 液晶显示模块设计和使用须知

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的

module get the best contrast ratio under different

使用温度下以及在不同的视角和位置观察模块显示，均

temperatures, view angles and positions.

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 best -

请注意液晶显示模块的显示品质判定是指在正常对比度

contrast ratio within viewable area. Unexpected display

下以及视窗 (V.A) 范围内进行的，非正常对比度下液晶可

pattern may come out under abnormal contrast ratio.

能会出现非预期的显示不良，应注意区分。

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。

请尽可能缩短信号线的连接，以避免对液晶显示模块的

Keep signal line as short as possible to reduce external

信号干扰。

noise interference.

集成电路因 IC 芯片 ( 如 TAB 或 COG) 对紫外线极为敏感，

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

强光环境下可能会引起液晶显示模块功能失效，故应采

might cause malfunction. Light sealing structure casing is

用不透光的外壳。

recommended.

请在液晶显示模块与外壳之间保留足够的空间 ( 可使用衬

垫 ) ，以缓冲外力对液晶显示模块的损坏或因受力不均而

Make sure there is enough space (with cushion) between

产生的显示不匀等异常现象。

case and LCD panel, to prevent external force passed on

to the panel; otherwise that may cause damage to the -

避免液晶显示屏在某一画面下长时间点亮，否则有出现

LCD and degrade its display result.

残影的风险；请通过软件每隔一段时间改变一次画面。

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

液晶显示模块的可靠性可能因温度冲击而降低。

(continuous ON segment).

请勿在阳光直射、高湿、高温或低温下储存和使用液晶

显示模块，这将造成液晶显示模块的损坏或失效。

LCD module reliability may be reduced by temperature

shock.

请勿在极限环境 ( 最大 / 最小存储 / 工作温度 ) 下使用或放

When storing and operating LCD module, avoids

置液晶显示模块超过 48 小时以上。

exposure to direct sunlight, high humidity, high or low -

液晶显示模块建议存储条件为 : 0 C~40 C <80%RH 。

temperature. They may damage or degrade the LCD -

请勿让液晶显示模块存储于带有酸性 , 碱性 , 有害气体

module.

环境之中。

Never leave LCD module in extreme condition (max./min -

在运输过程中 , 请勿让液晶显示模块跌落与猛烈震动 ,

storage/operate temperature) for more than 48hr.

同时避免异常挤压 , 高湿度 , 与阳光照射 .

Recommend LCD module storage conditions is 0 C~40 C -

液晶显示模块极易受静电损坏，请务必保证液晶显示模

<80%RH.

块在防静电的工作环境中使用或保存。 ( 如 : 烙铁正确接

LCD module should be stored in the room without acid,

地 , 等 )

alkali and harmful gas.

拿取液晶显示模块时需注意操作人员的接地情况。

Avoid dropping & violent shocking during transportation, -

请手持液晶显示模块的边沿取放模块，防止热压纸或 TAB

and no excessive pressure press, moisture and sunlight.

部位受力。

LCD module can be easily damaged by static electricity. -

焊接液晶模块时，请注意控制烙铁的温度、焊接时间，

Please

maintain

optimum

anti-static

working

以免烫坏导光板或偏光片，导致显示不匀等不良现象发

environment to protect the LCD module. (eg. ground the

生。

soldering irons properly)

请勿使用洗板水等腐蚀性液体接触液晶模块，以免腐蚀

Be sure to ground the body when handling LCD module.

导光板或模块电路。

Only hold LCD module by its sides. Never hold LCD

module by applying force on the heat seal or TAB.

仅可使用柔软的干布 , 异丙醇或乙醇清洁液晶屏表面，

When soldering, control the temperature and duration

其他任何溶剂 ( 如 : 水 ) 都有可能损坏液晶模块。

avoid damaging the backlight guide or diffuser which -

请勿挤压液晶显示模块上的元器件，以避免产生潜在的

might degrade the display result such as uneven display.

损坏或失效而影响产品可靠性。

Never let LCD module contact with corrosive liquids, -

装配液晶显示模块时，请务必注意避免液晶显示模块的

which might cause damage to the backlight guide or the

扭曲或变形。

electric circuit of LCD module.

请勿挤压液晶显示屏表面，这将导致显示颜色的异常。

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

液晶屏由玻璃制作而成，任何机械碰撞 ( 如从高处跌落 )

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

均有可能损坏液晶显示模块。

the LCD.

Never add force to components of LCD module. It may

cause invisible damage or degrade the module's

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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 -

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 electricity

生的静电。

may be generated.

因液晶显示屏表面的偏光片极易划伤，安装完成之前请

Polarizer on LCD gets scratched easily. If possible, do not

尽量不要揭下保护膜。

remove LCD protective film until the last step of -

请缓慢揭除保护膜，在此过程中液晶显示屏上可能会产

installation.

生静电线，此为正常情况，可在短时间内消失。

When peeling off protective film from LCD, static charge

may cause abnormal display pattern. The symptom is -

请注意避免被液晶显示屏的边缘割伤。

normal, and it will turn back to normal in a short while.

请不要试图拆卸或改造液晶显示模块。

LCD panel has sharp edges, please handle with care.

当液晶显示屏出现破裂 , 内部液晶液体可能流出 ; 相关

Never attempt to disassemble or rework LCD module.

液体不可吞吃 , 绝对不可接触嘴巴 , 如接触到皮肤或衣

If display panel is damaged and liquid crystal substance

服 , 请使用肥皂与清水彻底清洗 .

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.

7. 电容触摸屏安装指导

7.1 面框安装（附图 1 ）

7. CTP Mounting Instructions

客户面框窗口应大于 CTP 动作区域，各边离动作区应

≥ 0.5mm.

7.1 Bezel Mounting (Figure 1)

面框与 CTP 面板间应垫有胶垫，其最终间隙约为 0.5 ～

The bezel window should be bigger than the CTP active

1.0mm.

area. It should be≥0.5mm each side.

建议必要时在背面提供附加支架 ( 例如无安装结构的薄型

Gasket should be installed between the bezel and the

TFT 模块 ) ，应仅利用适当支撑以保持模块位置 .

CTP

surface.

The final gap should be about 0.5~1.0mm.

It is recommended to provide an additional support

安装结构应具有足够的强度，以防止外部不均匀力或扭

bracket for backside support when necessary (e.g. slim

曲力作用到模块上 .

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.

Figure 1

7.2 Surface Mounting (Figure 2)

7.2 嵌入安装（附图 2 ）

As the CTP assembling on the countersink area with -

客户面框应具有使用双面胶粘贴 CTP 的结构沉台面，其

double

side

adhesive.

粘贴面要求平整且洁净无污以保证粘贴牢靠 .

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 -

考虑到制作误差，建议面框与 CTP 盖板之间四周留有

side) around the cover lens for tolerance.

≥ 0.3mm 间隙 .

It is recommended to provide an additional support -

建议必要时在背面提供垫有胶垫附加支架 ( 例如无安装结

bracket with gasket for backside support when necessary

构的 TFT 模块 ) ，应仅利用适当支撑以保持模块位置 .

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(e.g.

TFT module without mounding structure). They

should only provide appropriate support and keep the -

安装结构应具有足够的强度，以防止外部不均匀力或扭

module in place.

曲力作用到模块上。

The mounting structure should be strong enough to

prevent external uneven force or twist act onto the module

Figure 2

7.3 Additional Cover Lens Mounting (Figure 3)

7.3 覆加盖板（附图 3 ）

For the case of additional cover Lens mounting, it is -

需要覆加玻璃盖板的安装，为确保其功能，有必要查看

necessary to recheck with the CTP specification about the

产品规格书中有关盖板材料和厚度的说明 .

material and thickness to ensure the functionality.

It should keep a 0.2~0.3mm gap between the cover lens -

玻璃盖板与 CTP 表面之间应留有 0.2 ～ 0.3mm 间隙 .

and the CTP surface..

The cover lens window should be bigger than the active -

玻璃盖板视窗应大于 CTP 动作区域，各边离动作区应

area of the CTP.It should be≥0.5mm each side.

≥ 0.5mm 。

It is recommended to provide an additional support -

建议必要时在背面提供附加支架 ( 例如无安装结构的薄型

bracket for backside support when necessary (e.g. slim

TFT 模块 ) ，应仅利用适当支撑以保持模块位置 .

type TFT module without mounding structure). They

should only provide appropriate support and keep the

module in place.

安装结构应具有足够的强度，以防止外部不均匀力或扭

The mounting structure should be strong enough to

曲力作用到模块上 .

prevent external uneven force or twist act onto the

module.

Figure 3

8. RTP Mounting Instructions

8. 电阻触摸屏安装指导

为避免面框直接压在动作区 (A.A.) 上造成误动作，面框与

It should bezel touching the RTP Active Area (A.A.) to

电阻触摸屏 (RTP) 之间应留有一定的空隙 D=0.2~0.3mm 之

prevent abnormal touch.It should left gab D=0.2~0.3mm

间 .( 附图 4)

in between. (Figure 4)

Outer bezel design should take care about the area

设计面框时，要注意用面框保护触摸屏四周的非保证操作

outside the A.A. Those areas contain circuit wires which is

区域，因为布线区域在此处形成一台阶，在此区域附近

having different thickness. Touching those areas could

操作时 ITO Film 变形较大，容易导致 ITO 损坏而降低寿

de-form the ITO film. As a result bezel the ITO film be

命。为保护 RTP 和避免误操作，在 RTP 与面框之间垫缓

damaged and shorten its lifetime.

冲物（ Gasket ），我们建议设计面框应覆盖动作区的边

It is suggested to protect those areas with gasket

缘，面框边缘到 V.A. 区的距离 B≥0.50mm; 垫圈内边缘

(between the bezel and RTP).The suggested figures are

到 V.A. 区的距离 C≥0.50mm. (附图 4)

B≥0.50mm; C≥0.50mm. (Figure 4)

The bezel side wall should keep space E= 0.2 ~ 0.3mm

在设计面框与 RTP 组装时，应考虑到面框内侧与 RTP 外侧

from the RTP. (Figure 4)

的间距 E≥0.2mm. (附图 4)

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Figure 4

In general design,

通常设计时：

RTP V.A. should be bigger than the TFT V.A.

RTP 的可视区 V.A. 应不小于 TFT 的可视区 V.A.

and RTP A.A. should be bigger than the TFT A.A.

及 RTP 的动作区 A.A. 应不小于 TFT 的动作区 A.A.

(Figure 5)

( 附图 5)

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.

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