LMT024FNHFWA-2

LMT024FNHFWA-2

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Caiwei

Date: 2022-08-20

Date:

Rev.

Descriptions

Release Date

0.1

Preliminary release

2021-12-08

0.2

Minor Updata

2022-06-09

0.3

Update Outline Dwg and General Specifications

2022-08-20

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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

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

3.3

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

3.4

Rseset Timing .......................................................................................................................9

4. Functions................................................................................................................................10

4.1

Display Commands ............................................................................................................10

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

7. Appendix A <Inspection items and criteria for appearance defect>..................................19

8. Outline Drawing.....................................................................................................................20

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1. General Specifications

Screen Size(Diagonal) :

2.4”

Active Area :

48.96x 36.72 mm

Number of dots :

320 x240(RGB)

Pixel Pitch ：

0.153 x 0.153 mm

Color Depth:

262K color

Display Technology :

a-Si TFT active matrix

Display Mode :

Transmissive with Normally black

Display Interface :

MCU_8bits / SPI

Pixel Configuration :

RGB Vertical Stripe

Viewing Direction :

All viewing angle(*1)(*2)

Backlight Type:

LEDs

Surface Treatment :

Operating Temperature :

-20 ~ +70°C(No Condensation)

Storage Temperature :

-30 ~ +80°C(No Condensation)

Note:

1. For saturated color display content (eg. pure-red, pure-green, pure-blue or pure-colors-combinations).

2. For “color scales” display content.

3. Color tone may slightly change by temperature and driving condition.

1.1

Block Diagram

LED_A, LED_K1~K4

Backlight Circuit

320x 240 （ RGB) pixels

TFT Panel

TE ， /RD ， /WR ， D/C ， /CS ， /RES

SDO ， SDA ， SCL

IM0~IM3

TFT Driver

ST7789VI or equivalent

D0~D7

VDD,VSS

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1.2

Terminal Functions

No.

PIN Name

I/O

Descriptions

If not use

VSS

Ground

Not connect. Using for internal OTP power supply.

Open

NC(SDO)

SPI interface II output signal

Open

Tearing effect signal is used to synchronize MCU to

Open

memory writing

I/O

VDD/VSS

I/O

MCU parallel interface data bus

I/O

When IM3:Low,SPI interface input/output pin.

VDD/VSS

VSS(SDA)

When IM3:High,SPI interface input pin.

SPI interface input/output pin;

/RD

MCU parallel interface read enable signal

VDD/VSS

1.MCU parallel interface write enable signal

VDD/VSS

/WR(D/C)

2.Display data /command selection in 4-line SPI

interface

1.MCU parallel interface display data/command

VDD/VSS

D/C （ SCL ）

selection signal.

2.SPI interface clock signal

/CS

chip select pin,low enable

/RES

chip reset signal ,low active.

IM0

MCU interface mode select pin0

IM1

MCU interface mode select pin1

IM2

MCU interface mode select pin2

IM3

MCU interface mode select pin3

VDD

Power supply for IC I/O system analog,digital and

booster circuit

VSS

Ground

LED_A

BL anode signal

LED_K1

LED_K2

BL cathode signal

LED_K3

LED_K4

VSS

Ground

Note ： Please add the FPC connector type and matched one if necessary.

Note ：

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2. Absolute Maximum Ratings

VSS=0V

Items

Symbol

Min.

Max.

Unit

Condition

Supply Voltage

VDD

-0.3

4.6

Input Voltage

V IN

-0.3

4.6

Operating Temperature

T OP

-20

+70

 C

Note1

Storage Temperature

T ST

-30

+80

 C

Note: Ta means the ambient temperature.

It is necessary to limit the relative humidity to the specified temperature range.

Condensation on the module is not allowed.

3. Electrical Characteristics

3.1

DC Characteristics

VDD=3.3V,VSS=0V, T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Application Pin

Logic Supply Voltage

IOVDD

3.2

3.3

3.4

VDD

Input High Voltage

V IH

0.7

SDO,SDA,/

IOVDD

RD,/WR,

Input Low Voltage

V IL

0.3

D/C,SCL,/CS,/

IOVCC

RES,D0~D7

Output High Voltage

V OH

0.8

IOVDD

D0~D7,TE

Output Low Voltage

V OL

0.2

IOVDD

Operating Current

I VDD

9.3

23.25

3.2

LED Backlight Circuit Characteristics

I LEDA =80mA, LEDK1~K4=0V,T OP =25  C

Items

Symbol

MIN.

TYP.

MAX.

Unit

Note

Forward Voltage

V LEDA

3.1

Forward Current

I LEDA

Cautions:

Exceeding the recommended driving current could cause substantial damage to the backlight and shorten its lifetime.

No. of LEDs = 4pcs

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3.3

AC Characteristics

MCU 8bit Timing

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3 line SPI Timing

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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4 line SPI Timing

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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3.4

Rseset Timing

VDD=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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Note: Please refer to Sitronix ST7789VI data sheet for more 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

Note2,3

θL

θR

Contrast Ratio

θ= 0°

600

800

Note 3

T ON

Response Time

25 ℃

Note 4

T OFF

White

Note 1,5

Red

Note 1,5

Chromaticity

Backlight is

Green

Note 1,5

Blue

Note 1,5

Uniformity

80%

Note 6

NTSC

65%

70%

Note 5

Luminance

250

300

cd/ ㎡ Note 7

Test Conditions:

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

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

Note 1: : reference Figure1

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 condition:

- Measuring surroundings: Dark room

- Measuring temperature: Ta=25 ℃ .

- Adjust 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: reference Figure2

The luminance uniformity is calculated by using following

Figure 1

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: reference Figure3

The definition of contrast ratio:

ContrastRatio(CR)=

Luminance When LCD is at

“White” state

Luminance When LCD is at

“Black” state

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(Contrast Ratio is measured in optimum common

electrode voltage)

“ 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)

Figure 2

Color coordinates measured at center point of LCD.

Note 6: Definition of Luminance Uniformity Figure4

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 diameter,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:

Figure 3

Measure the luminance of white state at center point.

Figure 4

6. LCD Module Design and Handling 6. 液晶显示模块设计和使用须知

Precautions

Please ensure V0, VCOM is adjustable, to enable LCD module get the -

请注意V0, VCOM 的设定, 以确保液晶显示模块在不同的

best contrast ratio under different temperatures, view angles and

使用温度下以及在不同的视角和位置观察模块显示，均能

positions.

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 contrast ratio -

请注意液晶显示模块的显示品质判定是指在正常对比度下

within viewable area. Unexpected display pattern may come out under

以及视窗(V.A)范围内进行的，非正常对比度下液晶可能

abnormal contrast ratio.

会出现非预期的显示不良，应注意区分。

Never operate the LCD module exceed the absolute maximum ratings. -

请勿在最大额定值以外使用液晶显示模块。

Never apply signal to the LCD module without power supply.

请勿在没有接通电源的条件下，给液晶显示模块输送信

号。

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

请尽可能缩短信号线的连接，以避免对液晶显示模块的信

interference.

号干扰。

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

集成电路因IC 片(如TAB或COG)对紫外线极为敏感，强

malfunction. Light sealing structure casing is recommended.

光环境下可能会引起液晶显示模块功能失效，故应采用不

透光的外壳。

Make sure there is enough space (with cushion) between case and -

请在液晶显示模块与外壳之间保留足够的空间(可使用衬

LCD panel, to prevent external force passed on to the panel;

垫)，以缓冲外力对液晶显示模块的损坏或因受力不均而

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otherwise that may cause damage to the LCD and degrade its display

产生的显示不匀等异常现象。

result.

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

避免液晶显示屏在某一画面下长时间点亮，否则有出现残

ON segment).

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 shock.

液晶显示模块的可靠性可能因温度冲击而降低。

When storing and operating LCD module, avoids exposure to direct -

请勿在阳光直射、高湿、高温或低温下储存和使用液晶显

sunlight, high humidity, high or low temperature. They may damage or

示模块，这将造成液晶显示模块的损坏或失效。

degrade the LCD module.

Never

leave

LCD

module

extreme

condition

(max./min -

请勿在极限环境(最大/最小存储/工作温度)下使用或放置

storage/operate temperature) for more than 48hr.

液晶显示模块超过48小时以上。

Recommend LCD module storage conditions is 0 C~40 C <80%RH.

液晶显示模块建议存储条件为: 0 C~40 C <80%RH 。

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

请勿让液晶显示模块存储于带有酸性, 碱性, 有害气体

harmful gas.

环境之中。

Avoid dropping & violent shocking during transportation, and no -

在运输过程中, 请勿让液晶显示模块跌落与猛烈震动, 同

excessive pressure press, moisture and sunlight.

时避免异常挤压, 高湿度, 与阳光照射.

LCD module can be easily damaged by static electricity. Please -

液晶显示模块极易受静电损坏，请务必保证液晶显示模块

maintain an optimum anti-static working environment to protect the

在防静电的工作环境中使用或保存。(如: 烙铁正确接地,

LCD module. (eg. ground the soldering irons properly)

等)

Be sure to ground the body when handling LCD module.

拿取液晶显示模块时需注意操作人员的接地情况。

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

请手持液晶显示模块的边沿取放模块，防止热压纸或TAB

applying force on the heat seal or TAB.

部位受力。

When soldering, control the temperature and duration avoid damaging -

焊接液晶模块时，请注意控制烙铁的温度、焊接时间，以

the backlight guide or diffuser which might degrade the display result

免烫坏导光板或偏光片，导致显示不匀等不良现象发生。

such as uneven display.

Never let LCD module contact with corrosive liquids, which might cause -

请勿使用洗板水等腐蚀性液体接触液晶模块，以免腐蚀导

damage to the backlight guide or the electric circuit of LCD module.

光板或模块电路。

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

仅可使用柔软的干布 , 异丙醇或乙醇清洁液晶屏表面，其

Other solvents (e.g. water) may damage the LCD.

他任何溶剂 (如: 水 ) 都有可能损坏液晶模块。

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

请勿挤压液晶显示模块上的元器件，以避免产生潜在的损

damage or degrade the module's reliability.

坏或失效而影响产品可靠性。

When mounting LCD module, please make sure it is free from twisting, -

装配液晶显示模块时，请务必注意避免液晶显示模块的扭

warping and bending.

曲或变形。

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

请勿挤压液晶显示屏表面，这将导致显示颜色的异常。

display color change abnormally.

LCD panel is made with glass. Any mechanical shock (e.g. dropping -

液晶屏由玻璃制作而成，任何机械碰撞 (如从高处跌落)均

from high place) will damage the LCD module.

有可能损坏液晶显示模块。

Protective film is attached on LCD screen. Be careful when peeling off -

液晶屏表面带有保护膜 , 揭除保护膜时需要注意可能产生

this protective film, since static electricity may be generated.

的静电。

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

因液晶显示屏表面的偏光片极易划伤，安装完成之前请尽

protective film until the last step of installation.

量不要揭下保护膜。

When peeling off protective film from LCD, static charge may cause ab- -

请缓慢揭除保护膜，在此过程中液晶显示屏上可能会产生

normal display pattern. The symptom is normal, and it will turn back to

静电线，此为正常情况，可在短时间内消失。

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 substance leaks out, be -

当液晶显示屏出现破裂 , 内部液晶液体可能流出 ; 相关液

sure not to get any in your mouth, if the substance comes into contact

体不可吞吃 , 绝对不可接触嘴巴 , 如接触到皮肤或衣服 ,

with your skin or clothes promptly wash it off using soap and water.

请使用肥皂与清水彻底清洗 .

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.

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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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7. Appendix A <Inspection items and criteria for appearance defect>

Items

Criteria

Open Segment or Common

Not permitted

Short

Not permitted

Wrong Viewing Angle

Not permitted

Decliners

Not permitted

Contrast Ration Uneven

According to the limit specimen

Crosstalk

According to the limit specimen

White spots

X>1 pixel

A-area

Not permitted

B-area

Max. 1 allowed

Max 6 spots allow

1/2 pixel<X≤1 pixel

A-area

Not permitted

B-area

Max. 2 allowed

X≤1/2 pixel

A-area

Max. 1 allowed

B-area

Max. 4 allowed

Black Sport

X>1 pixel

A-area

Not permitted

B-area

Max. 2 allowed

X≤1/2 pixel

A-area

Max. 1 allowed

B-area

Max. 4 allowed

Line Defect

Apparent vertical horizontal line defects are not permitted

Note:

On Pixel include 3 dots (RedDot + GreenDot + BlueDot)

Definition of Panel “A-area” and “B-area”

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8. Outline Drawing

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