LMT024FNHFWA-1

LMT024FNHFWA-1

LCD Module User Manual

Prepared by:

Checked by:

Approved by:

Likeke

Date: 2020-10-12

Date:

Rev. Descriptions

Release Date

0.1

Preliminary release

2020-10-12

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Table of Content

1. Basic 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 ............................................................................... 16

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

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

9. Appendix A <Inspection items and criteria for appearance defect> .......................................... 20

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1. Basic Specifications

Screen Size(Diagonal) :

2.4”

Color Depth:

65K/262k color

Number of dots :

320 x240(RGB)

Active Area :

48.96x 36.72 mm

Dot Pitch :

0.153 x 0.153 mm

Display Technology :

a-Si TFT active matrix

Display Mode :

Transmissive with Normally black

Pixel Configuration :

RGB Vertical Stripe

Viewing Direction :

All viewing angle

Backlight Type:

LEDs

Outline Dimension :

62x 43.52x 4.9mm(see dwg for details)

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

Note1 ： Please add the FPC connector type and matched one if necessary.

Note2 ：

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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

Note1: 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

Logic Supply Voltage

IOVDD

3.2

3.3

3.6

VDD

Input High Voltage

V IH

0.7

0.3

SDO,SDA,/R

IOVDD

D,/WR,

D/C,SCL,/CS

Input Low Voltage

V IL

1.0

,/RES,D0~D

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.

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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 module - 请注意 V0, VCOM 的设定, 以确保液晶显示模块在

get the best contrast ratio under different temperatures,

不同的使用温度下以及在不同的视角和位置观察模

view angles and positions.

块显示，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 best - 请注意液晶显示模块的显示品质判定是指在正常对

contrast ratio within viewable area. Unexpected display

比度下以及视窗(V.A)范围内进行的，非正常对比

pattern may com out under abnormal contrast ratio.

度下液晶可能会出现非预期的显示不良，应注意区

- Never operate the LCD module exceed the absolute maximum

分。

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

- Keep signal line as short as possible to reduce external

送信号。

noise interference.

- 请尽可能缩短信号线的连接，以避免对液晶显示模

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

块的信号干扰。

light might cause malfunction. Light sealing structure - 集成电路因 IC 芯片(如 TAB 或 COG)对紫外线极为

casing is recommended.

敏感，强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 - 请在液晶显示模块与外壳之间保留足够的空间(可

case and LCD panel, to prevent external force passed on to

使用衬垫)，以缓冲外力对液晶显示模块的损坏或

the panel; otherwise that may cause damage to the LCD and

因受力不均而产生的显示不匀等异常现象。

degrade its display result.

- Avoid showing a display pattern on screen for a long time - 避免液晶显示屏在某一画面下长时间点亮，否则有

(continuous ON segment).

出现残影的风险；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.

- 请勿在阳光直射、高湿、高温或低温下储存和使用

- When storing and operating LCD module, avoids exposure to

液晶显示模块，这将造成液晶显示模块的损坏或失

direct sunlight, high humidity, high or low temperature.

效。

They may damage or degrade the LCD module.

- Never leave LCD module in extreme condition (max./min - 请勿在极限环境(最大/最小存储/工作温度)下使用

storage/operate temperature) for more than 48hr.

或放置液晶显示模块超过 48 小时以上。

- Recommend LCD module storage conditions is 0 C~40 C - 液晶显示模块建议存储条件为 : 0 C~40 C

<80%RH.

<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

alkali and harmful gas.

害气体环境之中。

- Avoid dropping & violent shocking during transportation, - 在运输过程中, 请勿让液晶显示模块跌落与猛烈震

and no excessive pressure press, moisture and sunlight.

动, 同时避免异常挤压, 高湿度, 与阳光照射.

- LCD module can be easily damaged by static electricity. - 液晶显示模块极易受静电损坏，请务必保证液晶显

Please maintain an optimum anti-static working environment

示模块在防静电的工作环境中使用或保存。(如:

to protect the LCD module. (eg. ground the soldering irons

烙铁正确接地,等)

properly)

- 拿取液晶显示模块时需注意操作人员的接地情况。

- Be sure to ground the body when handling LCD module.

- 请手持液晶显示模块的边沿取放模块，防止热压纸

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

或 TAB 部位受力。

by applying force on the heat seal or TAB.

- 焊接液晶模块时，请注意控制烙铁的温度、焊接时

- When soldering, control the temperature and duration avoid

间，以免烫坏导光板或偏光片，导致显示不匀等不

damaging the backlight guide or diffuser which might

良现象发生。

degrade the display result such as uneven display.

- 请勿使用洗板水等腐蚀性液体接触液晶模块，以免

- Never let LCD module contact with corrosive liquids, which

腐蚀导光板或模块电路。

might cause damage to the backlight guide or the electric

circuit of LCD module.

- 仅可使用柔软的干布, 异丙醇或乙醇清洁液晶屏表

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

面，其他任何溶剂(如:水)都有可能损坏液晶模

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

块。

LCD.

- 请勿挤压液晶显示模块上的元器件，以避免产生潜

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

在的损坏或失效而影响产品可靠性。

invisible damage or degrade the module's reliability.

- 装配液晶显示模块时，请务必注意避免液晶显示模

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

块的扭曲或变形。

twisting, warping and bending.

- 请勿挤压液晶显示屏表面，这将导致显示颜色的异

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

常。

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cause the display color change abnormally.

- 液晶屏由玻璃制作而成，任何机械碰撞(如从高处

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

跌落)均有可能损坏液晶显示模块。

dropping from high place) will damage the LCD module.

- Protective film is attached on LCD screen. Be careful when - 液晶屏表面带有保护膜, 揭除保护膜时需要注意可

peeling off this protective film, since static electricity

能产生的静电。

may be generated.

- 因液晶显示屏表面的偏光片极易划伤，安装完成之

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

前请尽量不要揭下保护膜。

not 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

installation.

会产生静电线，此为正常情况，可在短时间内消

- When peeling off protective film from LCD, static charge

失。

may cause abnormal display pattern. The symptom is normal,

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

- 请注意避免被液晶显示屏的边缘割伤。

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

- 请不要试图拆卸或改造液晶显示模块。

- Never attempt to disassemble or rework LCD module.

- 当液晶显示屏出现破裂, 内部液晶液体可能流出;

- If display panel is damaged and liquid crystal substance

相关液体不可吞吃, 绝对不可接触嘴巴, 如接触到

leaks out, be sure not to get any in your mouth, if the

皮肤或衣服, 请使用肥皂与清水彻底清洗.

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)

- The bezel window should be bigger than the CTP active

- 面框与 CTP 面板间应垫有胶垫，其最终间隙约为

0.5～1.0mm.

area. It should be≥0.5mm each side.

- Gasket should be installed between the bezel and the CTP

- 建议必要时在背面提供附加支架(例如无安装结构

的薄型 TFT 模块)，应仅利用适当支撑以保持模块

surface.

位置.

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 - 安装结构应具有足够的强度，以防止外部不均匀力

module without mounding structure). They should only

或扭曲力作用到模块上.

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 double - 客户面框应具有使用双面胶粘贴 CTP 的结构沉台

side

adhesive.

面，其粘贴面要求平整且洁净无污以保证粘贴牢

The countersink area should be flat and clean to ensure

靠.

the double side adhesive installation result.

- The Bezel is recommend to keep a gap (≥0.3mm each side)

around the cover lens for tolerance.

- 考虑到制作误差，建议面框与 CTP 盖板之间四周留

- It is recommended to provide an additional support bracket

有≥0.3mm 间隙.

with gasket for backside support when necessary (e.g. TFT - 建议必要时在背面提供垫有胶垫附加支架(例如无

module without mounding structure). They should only

安装结构的 TFT 模块)，应仅利用适当支撑以保持

provide appropriate support and keep the module in place.

模块位置.

- The mounting structure should be strong enough to prevent

external uneven force or twist act onto the module

- 安装结构应具有足够的强度，以防止外部不均匀力

或扭曲力作用到模块上。

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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

necessary to recheck with the CTP specification about the

查看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 and - 玻璃盖板与 CTP 表面之间应留有 0.2～0.3mm 间隙.

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

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

应≥0.5mm。

- It is recommended to provide an additional support bracket - 建议必要时在背面提供附加支架(例如无安装结构

for backside support when necessary (e.g. slim type TFT

的薄型 TFT 模块)，应仅利用适当支撑以保持模块

module without mounding structure). They should only

位置.

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.

- 安装结构应具有足够的强度，以防止外部不均匀力

或扭曲力作用到模块上.

Figure 3

8. RTP Mounting Instructions

8. 电阻触摸屏安装指导

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

- 为避免面框直接压在动作区(A.A.)上造成误动作，

面框与电阻触摸屏(RTP)之间应留有一定的空隙

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

D=0.2~0.3mm 之间.(附图 4)

between. (Figure 4)

- Outer bezel design should take care about the area outside - 设计面框时，要注意用面框保护触摸屏四周的非保

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

证操作区域，因为布线区域在此处形成一台阶，在

different thickness. Touching those areas could de-form

此区域附近操作时 ITO Film 变形较大，容易导致

the ITO film. As a result bezel the ITO film be damaged

ITO 损坏而降低寿命。为保护 RTP 和避免误操作，

and shorten its lifetime.

在 RTP 与面框之间垫缓冲物（Gasket），我们建议

It is suggested to protect those areas with gasket

设计面框应覆盖动作区的边缘，面框边缘到 V.A.

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

区的距离 B≥0.50mm; 垫圈内边缘到 V.A.区的距离

B≥0.50mm; C≥0.50mm. (Figure 4)

C≥0.50mm. (附图 4)

- The bezel side wall should keep space E= 0.2 ~ 0.3mm from - 在设计面框与 RTP 组装时，应考虑到面框内侧与

the RTP. (Figure 4)

RTP 外侧的间距 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

(Figure 5)

A.A.

(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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9. 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

1/2 pixel<X≤1 pixel

A-area

Not permitted

allowed

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:

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

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

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