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LMT024FNHFWA
LCD Module User Manual
Prepared by:
Checked by:
Approved by:
likeke
Date: 2019-12-13
Date:
Date:
Rev.
Descriptions
Release Date
0.1
Preliminary release
2019-12-13
URL:
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Document Name: LMT024FNHFWA-Manual-Rev0.1.DOC
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LCD Module User Manual
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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. Precautions of using LCD Modules..........................................................................................17
7. Appendix A <Inspection items and criteria for appearance defect>....................................18
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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 :
60.26x 42.72x 2.55mm
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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2. Absolute Maximum Ratings
VSS=0V
Items
Symbol
Min.
Max.
Unit
Condition
Supply Voltage
VDD
-0.3
4.6
V
-
Input Voltage
V IN
-0.3
4.6
V
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
Pin
Logic Supply Voltage
IOVDD
3.2
3.3
3.6
V
VDD
Input High Voltage
V IH
0.7
0.3
SDO,SDA,/
IOVDD
-
IOVDD
V
RD,/WR,
D/C,SCL,/
Input Low Voltage
V IL
-
-
1.0
V
CS,/
RES,D0~D7
Output High Voltage
V OH
0.8
IOVDD
-
-
V
D0~D7,TE
Output Low Voltage
V OL
-
-
0.2
IOVDD
V
Operating Current
I VDD
-
9.3
23.25
mA
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
-
V
Forward Current
I LEDA
-
80
-
mA
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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3.4 Rseset Timing
VDD=3.3V,VSS=0V, OPT =25
C
Item
Symbol
MIN.
TYP.
MAX.
Unit
Reset LOW pulse width
T RW
10
-
-
us
Reset time
T RT
-
-
120
ms
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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
70
80
-
View Angles
θB
CR ≧ 10
70
80
-
Degree
Note2,3
θL
70
80
-
θR
70
80
-
Contrast Ratio
CR
θ= 0°
600
800
-
Note 3
T ON
Response Time
25 ℃
-
20
30
ms
Note 4
T OFF
x
-
-
-
White
Note 1,5
y
-
-
-
x
-
-
-
Red
Note 1,5
Chromaticity
Backlight is
y
-
-
-
x
on
-
-
-
Green
Note 1,5
y
-
-
-
x
-
-
-
Blue
Note 1,5
y
-
-
-
Uniformity
U
-
80%
-
%
Note 6
NTSC
65%
70%
-
%
Note 5
Luminance
L
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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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 ℃ .
- Adjust operating voltage to get optimum contrast at the center of the display.
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
interval 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
S=
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. Precautions of using LCD Modules
Mounting
-
Mounting must use holes arranged in four corners or four sides.
-
The mounting structure so provide even force on to LCD module. Uneven force (ex. Twisted stress)
should not applied to the module. And the case on which a module is mounted should have sufficient
strength so that external force is not transmitted directly to the module.
-
It is suggested to attach a transparent protective plate to the surface in order to protect the polarizer.
It should have sufficient strength in order to the resist external force.
-
The housing should adopt radiation structure to satisfy the temperature specification.
-
Acetic acid type and chlorine type materials for the cover case are not desirable because the former
generates corrosive gas of attacking the polarizer at high temperature and the latter causes circuit
break by electro-chemical reaction.
-
Do not touch, push or rub the exposed polarizers with glass, tweezers or anything harder than HB
pencil lead. Never rub with dust clothes with chemical treatment. Do not touch the surface of polarizer
for bare hand or greasy cloth.(Some cosmetics deteriorate the polarizer.)
-
When the surface becomes dusty, please wipe gently with absorbent cotton or other soft materials
like chamois soaks with petroleum benzine. Normal-hexane is recommended for cleaning the
adhesives used to attach front / rear polarizers. Do not use acetone, toluene and alcohol because
they cause chemical damage to the polarizer.
Operating
-
The spike noise causes the mis-operation of circuits. It should be within the ±200mV level (Over and
under shoot voltage)
-
Response time depends on the temperature.(In lower temperature, it becomes longer.)
-
Brightness depends on the temperature. (In lower temperature, it becomes lower.) And in lower
temperature, response time(required time that brightness is stable after turned on) becomes longer.
-
Be careful for condensation at sudden temperature change. Condensation makes damage to
polarizer or electrical contacted parts. And after fading condensation, smear or spot will occur.
-
When fixed patterns are displayed for a long time, remnant image is likely to occur.
-
Module has high frequency circuits. Sufficient suppression to the electromagnetic interference shall
be done by system manufacturers. Grounding and shielding methods may be important to minimized
the interference
Electrostatic Discharge Control
Since a module is composed of electronic circuits, it is not strong to electrostatic discharge. Make certain
that treatment persons are connected to ground through wrist band etc. And don’t touch interface pin
directly.
Strong Light Exposure
Strong light exposure causes degradation of polarizer and color filter.
Storage
When storing modules as spares for a long time, the following precautions are necessary.
-
Store them in a dark place. Do not expose the module to sunlight or fluorescent light. Keep the
temperature between 5°C and 35°C at normal humidity.
-
The polarizer surface should not come in contact with any other object. It is recommended that they
be stored in the container in which they were shipped.
Protection Film
-
When the protection film is peeled off, static electricity is generated between the film and polarizer.
This should be peeled off slowly and carefully by people who are electrically grounded and with well
ion-blown equipment or in such a condition, etc.
-
The protection film is attached to the polarizer with a small amount of glue. If some stress is applied
to rub the protection film against the polarizer during the time you peel off the film, the glue is apt tore
main on the polarizer. Please carefully peel off the protection film without rubbing it against the
polarizer.
-
When the module with protection film attached is stored for a long time, sometimes there remains a
very small amount of glue still on the polarizer after the protection film is peeled off.
-
You can remove the glue easily. When the glue remains on the polarizer surface or its vestige is
recognized, please wipe them off with absorbent cotton waste or other soft material like chamois
soaked with normal-hexane.
Transportation
The LCD modules should be no falling and violent shocking during transportation, and also should avoid
excessive press, water, damp and sunshine.
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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
ed
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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