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) Preliminary Specification
(
( ) Final Specification
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LM238WF1
Liquid Crystal Display
Product Specification
SPECIFICATION
FOR
APPROVAL
BUYER
MODEL
APPROVED BY
/
/
/
General
SIGNATURE
DATE
23.8” Full HD TFT LCD Title
SUPPLIER LG Display Co., Ltd.
*MODEL LM238WF1
SUFFIX SLA1
*When you obtain standard approval,
please use the above model name without suffix
APPROVED BY
C.K. Lee / G.Manager
REVIEWED BY
D.G. Kim / Manager [C]
S.Y. An / Manager [M]
D.H. Kang / Manager [P]
PREPARED BY
S.J. Yeom / Engineer
SIGNATURE
DATE
Please return 1 copy for your confirmation with
your signature and comments.
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LM238WF1
Liquid Crystal Display
Product Specification
Contents
No ITEM
COVER
CONTENTS
RECORD OF REVISIONS
1 GENERAL DESCRIPTION
2 ABSOLUTE MAXIMUM RATINGS
3 ELECTRICAL SPECIFICATIONS
3-1 ELECTRICAL CHARACTREISTICS
3-2 INTERFACE CONNECTIONS
3-3 SIGNAL TIMING SPECIFICATIONS
3-4 SIGNAL TIMING WAVEFORMS
3-5 COLOR INPUT DATA REFERNECE
3-6 POWER SEQUENCE
Page
1
2
3
4
5
6
6
9
14
15
16
17
3-7 V
4 OPTICAL SPECIFICATIONS
5 MECHANICAL CHARACTERISTICS
6 RELIABLITY
7 INTERNATIONAL STANDARDS
7-1 SAFETY
7-2 EMC
7-3 ENVIRONMENT
8 PACKING
8-1 DESIGNATION OF LOT MARK
8-2 PACKING FORM
9 PRECAUTIONS 31
Power Dip Condition
LCD
18
19
25
28
29
29
29
29
30
30
30
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LM238WF1
Liquid Crystal Display
Product Specification
RECORD OF REVISIONS
Revision
No
0.1 Oct., 11, 2012 - First Draft, Preliminary Specifications
Revision
Date
Page Description
-
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LM238WF1
Liquid Crystal Display
Product Specification
1. General Description
LM238WF1 is a Color Active Matrix Liquid Crystal Display with a Light Emitting Diode ( White LED) backlight
system without LED driver. The matrix employs a-Si Thin Film Transistor as the active element.
It is a transmissive type display operating in the normally black mode. It has a 23 inch diagonally measured
active display area with FHD resolution (1080 vertical by 1920horizontal pixel array)
Each pixel is divided into Red, Green and Blue sub-pixels or dots which are arranged in vertical stripes.
Gray scale or the brightness of the sub-pixel color is determined with a 8-bit gray scale signal for each dot,
thus, presenting a palette of more than 16,7M colors with A-FRC (Advanced Frame Rate Control).
It has been designed to apply the 8Bit 2 port LVDS interface.
It is intended to support displays where high brightness, super wide viewing angle,
high color saturation, and high color are important.
RGB
EEPROM
Source Driver Circuit
LVDS
2port
CN1
(30pin)
+5.0V
+5.0V
V
LED
General Features
I2C
Power Circuit
Timing
Controller
Logic Power
Block
CN2 (6PIN)
[ Figure 1 ] Block diagram
G1
Gate Driver
Circuit
TFT - LCD Panel
(1920 Ý RGB Ý 1080 pixels)
G1080
Active Screen Size 23.8 inches diagonal
Outline Dimension 543.0(H) x 317.4(V) x 11.2(D) mm (Typ.)
Pixel Pitch 0.2745 mm x 0.2745 mm
S1 S1920
Back light Assembly
(LED)
Pixel Format 1920 horiz. By 1080 vert. Pixels RGB stripes arrangement
Color Depth 16.7M colors (6bit + A-FRC)
Luminance, White 250 cd/m
2
( Center 1 Point, Typ.)
Viewing Angle(CR>10) View Angle Free (R/L 178(Typ.), U/D 178(Typ.))
Power Consumption Total 17.3 Watt (Typ.) ( 2.7 Watt
@VLCD, 14.6 Watt @Is=100mA )
Weight 2,270 g (typ.)
Display Operating Mode Transmissive mode, normally black
Panel type Reverse type
Surface Treatment Hard coating(3H), Anti-glare treatment of the front polarizer
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LM238WF1
Liquid Crystal Display
Product Specification
2. Absolute Maximum Ratings
The following are maximum values which, if exceeded, may cause faulty operation or damage to the unit.
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Symbol
Power Input Voltage
Operating Temperature
Storage Temperature
Operating Ambient Humidity
Storage Humidity
LCM Surface Temperature
(Operation)
VLCD -0.3 6.0 Vdc
TOP 0 50 ¶C
TST -20 60 ¶C
HOP 10 90 %RH
HST 10 90 %RH
T
Surface
Values
Units Notes
Min Max
at 25 r 2¶C
1, 2, 3
0 65 1, 4
Note : 1. Temperature and relative humidity range are shown in the figure below.
Wet bulb temperature should be 39 ¶C Max, and no condensation of water.
2. Maximum Storage Humidity is up to 40, 70% RH only for 4 corner light leakage Mura.
3. Storage condition is guaranteed under packing condition
4. LCM Surface Temperature should be Min. 0 and Max. 65 under the VLCD=5.0V,
fV=60Hz, 25 ambient Temp. no humidity control and LED string current is typical value.
FIG.2 Temperature and relative humidity
90%
60
50
Wet Bulb
Temperature [C]
40
30
20
10
0
10 20 30 40 50 60 70 80 0 -20
Dry Bulb Temperature [C]
Ver. 0.1 Oct., 11, 2012
60%
40%
10%
Storage
Operation
Humidity [(%)RH]
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LM238WF1
Liquid Crystal Display
Product Specification
3. Electrical Specifications
3-1. Electrical Characteristics
It requires two power inputs. One is employed to power the LCD electronics and to drive the TFT array and
liquid crystal. The second input power for the LED/Backlight, is typically generated by a LED Driver.
The LED Driver is an external unit to the LCDs.
Table 2-1. ELECTRICAL CHARACTERISTICS
Parameter Symbol
MODULE :
Power Supply Input Voltage V
Permissive Power Input Ripple V
Power Supply Input Current I
Power Consumption P
Rush current I
LCD
dRF
LCD
c TYP
RUSH
Min Typ Max
4.5 5 5.5
- 535 655
- 655 815
- 2.7 3.3
- - 3
Values
200
Unit Notes
Vdc
mVp-p 1
mA 2
mA 3
Watt 2
A 4
Note :
1. Permissive power ripple should be measured under V
=5.0V, 25¶C, fV(frame frequency)=MAX
LCD
condition and At that time, we recommend the bandwidth configuration of oscilloscope is to be under
20Mhz. See the next page.
2. The specified current and power consumption are under the V
=5.0V, 25· 2¶C,fV=60Hz condition
LCD
whereas Typical Power Pattern [Mosaic] shown in the [ Figure 3 ] is displayed.
3. The current is specified at the maximum current pattern.
4. Maximum Condition of Inrush current :
The duration of rush current is about 5ms and rising time of power Input is 500us r 20%.(min.).
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LM238WF1
Liquid Crystal Display
Product Specification
• Permissive Power input ripple (V
White pattern
• Power consumption (V
=5V, 25¶C, fV (frame frequency=60Hz condition)
LCD
=5.0V, 25¶C, fv (frame frequency)=MAX condition)
LCD
Black pattern
Typical power Pattern
Maximum power Pattern
FIG.3 Mosaic pattern & White Pattern for power consumption measurement
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Product Specification
Table 2-2. LED Bar ELECTRICAL CHARACTERISTICS
LM238WF1
Liquid Crystal Display
Parameter Symbol
LED String Current Is - 100 105 mA 1, 2, 5
LED String Voltage Vs 45.6 48.8 52.0 V 1, 5
Power Consumption
LED Life Time LED_LT 30,000 - - Hrs 3
PBar - 14.6 15.6 Watt 1, 2, 4
Min. Typ. Max.
Values
Unit Notes
Notes) The LED Bar consists of 48 LED packages, 3 strings (parallel) x 16 packages (serial)
LED driver design guide
: The design of the LED driver must have specifications for the LED in LCD Assembly.
The performance of the LED in LCM, for example life time or brightness, is extremely influenced by
the characteristics of the LED driver.
So all the parameters of an LED driver should be carefully designed and output current should be
Constant current control.
Please control feedback current of each string individually to compensate the current variation
among the strings of LEDs.
When you design or order the LED driver, please make sure unwanted lighting caused by
the mismatch of the LED and the LED driver (no lighting, flicker, etc) never occurs.
When you confirm it, the LCD module should be operated in the same condition as installed in
your instrument.
1. The specified values are for a single LED bar.
2. The specified current is defined as the input current for a single LED string with 100% duty cycle.
3. The LED life time is defined as the time when brightness of LED packages become 50% or less
than the initial value under the conditions at Ta = 25 r 2¶C and LED string current is typical value.
4. The power consumption shown above does not include loss of external driver.
The typical power consumption is calculated as P
The maximum power consumption is calculated as P
Bar = Vs(Typ.) x Is(Typ.) x No. of strings.
Bar = Vs(Max.) x Is(Typ.) x No. of strings.
5. LED operating conditions are must not exceed Max. ratings.
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LM238WF1
Liquid Crystal Display
Product Specification
Table 3. BACKLIGHT CONNECTOR PIN CONFIGURATION(CN2)
The LED interface connector is a model GT108-6P-H26(HF), wire-locking type manufactured by LSM.
The mating connector is a SHJP-06V-S(HF) or SHJP-06V-A-K(HF) and Equivalent.
The pin configuration for the connector is shown in the table below.
Pin Symbol Description
1 FB1 Channel1 Current Feedback
2 NC NC
3 VLED LED Power Supply
4 VLED LED Power Supply
5 FB2 Channel2 Current Feedback
6 FB3 Channel3 Current Feedback
#6 #1
Rear view of LCM
[ Figure 5 ] Backlight connector view
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Liquid Crystal Display
Product Specification
3-2. Interface Connections
3-2-1. LCD Module
- LCD Connector(CN1) : IS100-L30O-C23 (UJU) , GT103-30S-HF15 (LSM)
- Mating Connector : FI-X30C2L (Manufactured by JAE) or Equivalent
Table 3. MODULE CONNECTOR(CN1) PIN CONFIGURATION
No Symbol Description No Symbol Symbol
LM238WF1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
FR0M
FR0P
FR1M
FR1P
FR2M
FR2P
GND
FCLKINM
FCLKINP
FR3M
FR3P
SR0M
SR0P
GND
SR1M
Minus signal of odd channel 0 (LVDS)
Plus signal of odd channel 0 (LVDS)
Minus signal of odd channel 1 (LVDS)
Plus signal of odd channel 1 (LVDS)
Minus signal of odd channel 2 (LVDS)
Plus signal of odd channel 2 (LVDS)
Ground
Minus signal of odd clock channel (LVDS)
Plus signal of odd clock channel (LVDS)
Minus signal of odd channel 3 (LVDS)
Plus signal of odd channel 3 (LVDS)
Minus signal of even channel 0 (LVDS)
Plus signal of even channel 0 (LVDS)
Ground
Minus signal of even channel 1 (LVDS)
16
SR1P
17
GND
18
SR2M
19
SR2P
20
SCLKINM
21
SCLKINP
22
SR3M
23
SR3P
24
GND
25
NC
26
NC
PWM_OUT For Control Burst frequency of Inverter
27
28
VLCD
29
VLCD
30
VLCD
Plus signal of even channel 1 (LVDS)
Ground
Minus signal of even channel 2 (LVDS)
Plus signal of even channel 2 (LVDS)
Minus signal of even clock channel (LVDS)
Plus signal of even clock channel (LVDS)
Minus signal of even channel 3 (LVDS)
Plus signal of even channel 3 (LVDS)
Ground
No Connection (I2C Serial interface for LCM)
No Connection.(I2C Serial interface for LCM)
Power Supply +5.0V
Power Supply +5.0V
Power Supply +5.0V
Note: 1. All GND(ground) pins should be connected together and to Vss which should also be connected to
the LCD’s metal frame.
LCD
2. All V
(power input) pins should be connected together.
3. Input Level of LVDS signal is based on the IEA 664 Standard.
4. PWM_OUT signal controls the burst frequency of a inverter.
This signal is synchronized with vertical frequency.
It’s frequency is 3 times of vertical frequency, and it’s duty ratio is 50%.
If you don’t use this pin, it is no connection.
#1 #30
IS100-L30O-C23
#1
#30
Rear view of LCM
FIG.4 Connector diagram
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Table 4. REQUIRED SIGNAL ASSIGNMENT FOR Flat Link (TI:SN75LVDS83) Transmitter
Pin # Require Signal Pin Name Pin # Require Signal Pin Name
1 Power Supply for TTL Input VCC 29 Ground pin for TTL GND
2 TTL Input (R7) D5 30 TTL Input (DE) D26
3 TTL Input (R5) D6 31 TTL Level clock Input TX CLKIN
4 TTL Input (G0) D7 32 Power Down Input PWR DWN
5 Ground pin for TTL GND 33 Ground pin for PLL PLL GND
6 TTL Input (G1) D8 34 Power Supply for PLL PLL VCC
7 TTL Input (G2) D9 35 Ground pin for PLL PLL GND
LM238WF1
8 TTL Input (G6) D10 36 Ground pin for LVDS LVDS GND
9 Power Supply for TTL Input VCC 37 Positive LVDS differential data output 3 TxOUT3ు
10 TTL Input (G7) D11 38 Negative LVDS differential data output 3 TxOUT3ృ
11 TTL Input (G3) D12 39 Positive LVDS differential clock output TX CLKOUTు
12 TTL Input (G4) D13 40 Negative LVDS differential clock output TX CLKOUTృ
13 Ground pin for TTL GND 41 Positive LVDS differential data output 2 TX OUT2ు
14 TTL Input (G5) D14 42 Negative LVDS differential data output 2 TX OUT2ృ
15 TTL Input (B0) D15 43 Ground pin for LVDS LVDS GND
16 TTL Input (B6) D16 44 Power Supply for LVDS LVDS VCC
17 Power Supply for TTL Input VCC 45 Positive LVDS differential data output 1 TX OUT1ు
46 Negative LVDS differential data output 1 TX OUT1ృ 18 TTL Input (B7) D17
19 TTL Input (B1) D18
20 TTL Input (B2) D19
22 TTL Input (B3) D20
47 Positive LVDS differential data output 0 TX OUT0ు
48 Negative LVDS differential data output 0 TX OUT0ృ
49 Ground pin for LVDS LVDS GND 21 Ground pin for TTL Input GND
50 TTL Input (R6) D27
23 TTL Input (B4) D21
24 TTL Input (B5) D22
25 TTL Input (RSVD) D23
26 Power Supply for TTL Input VCC 54 TTL Input (R2) D2
51 TTL Input (R0) D0
52 TTL Input (R1) D1
53 Ground pin for TTL GND
55 TTL Input (R3) D3 27 TTL Input (HSYNC) D24
56 TTL Input (R4) D4 28 TTL Input (VSYNC) D25
Notes : 1. Refer to LVDS Transmitter Data Sheet for detail descriptions.
2. 7 means MSB and 0 means LSB at R,G,B pixel data
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LVDS Input characteristics
1. DC Specification
LVDS -
LVDS +
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LM238WF1
Liquid Crystal Display
Product Specification
|VID|
# |VID| = |(LVDS+) ˀ (LVDS-)|
# V
= {(LVDS+) + (LVDS-)}/2
CM
0V
Description Symbol Min Max Unit Notes
LVDS Differential Voltage |V
LVDS Common mode Voltage V
LVDS Input Voltage Range V
Change in common mode Voltage ΔV
2. AC Specification
LVDS Clock
LVDS Data
SKEW
t
V
CM
| 200 600 mV -
ID
CM
IN
CM - 250 mV -
SKEW
clk
t
( F
= 1 / T
1 ) 95 MHz > Fclk ≥ 85 MHz : - 300 ~ + 300
2 ) 85 MHz > Fclk ≥ 65 MHz : - 400 ~ + 400
3 ) 65 MHz > Fclk ≥ 30 MHz : - 600 ~ + 600
1.0 1.5 V -
0.7 1.8 V -
T
clk
clk
)
V
IN_MAXVIN_MIN
Description Symbol Min Max Unit Notes
LVDS Clock to Data Skew Margin
LVDS Clock to Clock Skew Margin
(Even to Odd)
t
SKEW
t
SKEW
t
SKEW
t
SKEW_EO
- 300 + 300 ps
- 400 + 400 ps
- 600 + 600 ps
- 1/7 + 1/7 T
95MHz > Fclk ≥ 85MHz
85MHz > Fclk ≥ 65MHz
65MHz > Fclk ≥ 30MHz
clk
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Product Specification
t
SKEW_EO
LM238WF1
Liquid Crystal Display
LVDS Odd Clock
LVDS Even Clock
LVDS Even Data
3. Data Format
1) LVDS 2 Port
RCLK +
RXinO0 +/-
RXinO1 +/-
RXinO2 +/-
RXinO3 +/-
RXinE0 +/-
RXinE1 +/-
OR3 OR2 OR1 OR0
OG4 OG3 OG2 OG1
OB5 OB4 OB3 OB2
OG7 OG6 OR7 OR6
ER3 ER2 ER1 ER0
EG4 EG3 EG2 EG1
T
clk
T
clk
< Clock skew margin between channel >
Tclk
Tclk * 4/7 Tclk * 3/7
Tclk * 1/7
OG0 OR5 OR4 OR3 OR2 OR1 OR0
OB1 OB0 OG5 OG4 OG3 OG2 OG1
VSYNC HSYNC
DE
X OB7 OB6 OG7 OG6 OR7 OR6
EG0 ER5 ER4 ER3 ER2 ER1 ER0
EB1 EB0 EG5 EG4 EG3 EG2 EG1
OB5 OB4 OB3 OB2
OG0 OR5 OR4
OB1 OB0 OG5
VSYNC HSYNC
DE
X OB7 OB6
EG0 ER5 ER4
EB1 EB0 EG5
MSB R7
R6
R5
R4
R3
R2
R1
R0LSB
* ODD = 1st Pixel
EVEN = 2nd Pixel
RXinE2 +/-
RXinE3 +/-
EB5 EB4 EB3 EB2
EG7 EG6 ER7 ER6
DE
X EB7 EB6 EG7 EG6 ER7 ER6
EB5 EB4 EB3 EB2
VSYNC HSYNC
Current(Nth) CyclePrevious(N-1)th Cycle Next(N+1)th Cycle
< LVDS Data Format >
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VSYNC HSYNC
DE
X EB7 EB6
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LM238WF1
Liquid Crystal Display
Product Specification
3-3. Signal Timing Specifications
This is signal timing required at the input of the TMDS transmitter. All of the interface signal timing should be
satisfied with the following specifications for it’s proper operation.
Table 6. TIMING TABLE
ITEM Symbol Min Typ Max Unit Note
Period tCLK
DCLK
Frequency -
Period tHP
Hsync
Vsync
Horizontal Valid tHV
Frequency fH
Period tVP
Vertical Valid tVV
Frequency fV
Note: Hsync period and Hsync width-active should be even number times of t
times of t
CLK, display control signal can be asynchronous. In order to operate this LCM a Hsync,
11.43 13.89 17.6 ns
57 72 87.5 MHz
1024 1088 1120 tCLK
960 960 960 tCLK
64 66 83 KHz
1090 1100 1160 tHP
1080 1080 1080 tHP
48 60 75 Hz
CLK. If the value is odd number
5
Vsyn, and DE(data enable) signals should be used.
1. The performance of the electro-optical characteristics may be influenced by variance of the vertical
refresh rates.
2. Vsync and Hsync should be keep the above specification.
3. Hsync Period, Hsync Width, and Horizontal Back Porch should be any times of of character
number(4).
4. The polarity of Hsync, Vsync is not restricted.
5. The Max frequency of 1920X1080 resolution is 82.5Mhz
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3-4. Signal Timing Waveforms
1. DCLK , DE, DATA waveforms
tCLK
DCLK
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LM238WF1
Liquid Crystal Display
Product Specification
Valid data
First data
Second data
Invalid data
Invalid data
DE(Data Enable)
2. Horizontal waveform
DE(Data Enable)
Pixel 0,0
Valid data
Pixel 1,0
Pixel 2,0
Pixel 3,0
tHV
Invalid data
Invalid data
tHP
DE
3. Vertical waveform
t
VP
tVV
tHP
DE(Data Enable)
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LM238WF1
Liquid Crystal Display
Product Specification
3-5. Color Input Data Reference
The Brightness of each primary color(red,green,blue) is based on the 8-bit gray scale data input for the color;
the higher the binary input, the brighter the color. The table below provides a reference for color versus data
input.
Table 7. COLOR DATA REFERENCE
Input Color Data
Basic
Color
RED
Color
MSB LSB
R7 R6 R5 R4 R3 R2 R1 R0 G7 G6 G5 G4 G3 G2 G1 G0 B7 B6 B5 B4 B3 B2 B1 B0
Black 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Red (255) 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Green (255) 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
Blue (255) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Cyan 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Magenta 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
Yellow 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
White 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
RED (000) Dark 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RED (001) 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
... ... ... ...
RED (254) 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RED (255) 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RED
MSB LSB
GREEN
BLUE
MSB LSB
GREEN (000) Dark 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
GREEN (001) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0
GREEN
GREEN (254) 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0
GREEN (255) 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0
BLUE (000) Dark 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
BLUE (001) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
BLUE
BLUE (254) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0
BLUE (255) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
... ... ... ...
... ... ... ...
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3-6. Power Sequence
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LM238WF1
Liquid Crystal Display
Product Specification
Power Supply For LCD
V
LCD
Interface Signal (Tx)
0V
0V
Power Supply for LED
Table 8. POWER SEQUENCE
Parameter
90%
10%
1 T2 T5 T7
T
90%
Valid Data
T3 T4
LED Off LED Off
Min Typ Max
LED On
Values
10%
Units
T1 0.5 - 10 ms
T2 0.01 - 50 ms
T3 500 - - ms
T4 200 - - ms
T5 0.01 - 50 ms
T7 1000 - ms
Notes : 1. Please avoid floating state of interface signal at invalid period.
2. When the interface signal is invalid, be sure to pull down the power supply for LCD V
LCD
3. The invalid signal means out of the signal timing specification which define as page 14.
4. The above power sequence should be satisfied the basic power on/off and
resolution, timing transition.
5. LED power must be turn on after power supply for LCD and interface signal are valid.
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3-7. V
Power Dip Condition
LCD
td
FIG.6 Power dip condition
V
LCD
4.5V
3.5V
GND(ground)
1) Dip condition
3.5V ≤V
LCD
2) V
3.5V
LCD
V
-dip conditions should also follow the Power On/Off conditions for supply voltage.
LCD
4.5V , td≤20ms
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4. Optical Specifications
Optical characteristics are determined after the unit has been ‘ON’ for approximately 30 minutes
in a dark environment at 25·2¶C. The values specified are at an approximate distance 50cm from the LCD
surface at a viewing angle of ) and T equal to 0 ¶ and aperture 1 degree.
FIG. 1 presents additional information concerning the measurement equipment and method.
PR 880 or RD 80S
or PR650
Optical Stage(x,y)
LCD Module
50cm
FIG.7 Optical Characteristic Measurement Equipment and Method
Table 9. OPTICAL CHARACTERISTICS
Parameter Symbol
Contrast Ratio CR 600 1000 - 1
Surface Luminance, white L
Luminance Variation
Gray To Gray T
Response Time
Gray to Gray
(σ)
RED Rx
GREEN Gx TBD
Color Coordinates
[CIE1931]
(By PR650)
BLUE Bx TBD
WHITE Wx 0.313
Color Shift
(Avg. Δu’v’ < 0.02)
Horizontal
Vertical
Viewing Angle (CR>10)
General
GSR @ 60dgree
(Gamma shift rate)
Horizontal
Vertical
Horizontal
Vertical
WPT (White Point Tracking) - -300 G255 CCT +700 K 8
Gray Scale - 2.2 9
WH
G
WHITE
GTG_AVR
G to G
σ
Ry TBD
Gy TBD
By TBD
Wy 0.329
T
CST_H
T
CST_V
T
H
T
V
G
Gamma_H
G
Gamma_V
(Ta=25 ¶C, V
Min Typ Max
200 250 - cd/m
=5V, fV=60Hz Dclk=144MHz, IS=100mA)
LCD
Values
Units Notes
2
2
75 - - % 3
- 14 25 ms 4
- (5) - ms
Reference
10,11
TBD
Typ
-0.03
- 140 -
Typ
+0.03
Degree 5
- 100 -
170 178 170 178 -
- - 20
Degree 6
% 7
- - 20
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Notes 1. Contrast Ratio(CR) is defined mathematically as :
It is measured at center point(Location P1)
2. Surface luminance(L
from the surface with all pixels displaying white. For more information see FIG.8 (By PR880)
3. The variation in surface luminance , G WHITE is defined as :
Where L1 to L9 are the luminance with all pixels displaying white at 9 locations.
For more information see FIG.8
4. Gray to gray response time is the time required for the display to transition from gray to gray.
For additional information see Table 10.
RatioContrast
WH)is luminance value at Center 1 point(P1) across the LCD surface 50cm
G
WHI TE
(By RD80S)
(By PR880)
}
)L .. ,L,Minimum(L
P9P2P1
100
u
)L .... ,L ,(L Maximum
P9P2P1
pixels whiteall with Luminance Surface
pixelsblack all with Luminance Surface
(By PR880)
5. Color shift is the angle at which the average color difference for all Macbeth is lower than 0.02.
For more information see FIG.9
- Color difference (Δu’v’)
'
u’1, v’1 : u’v’ value at viewing angle direction
u’2, v’2 : u’v’ value at front (θ=0)
i : Macbeth chart number (Define 23 page)
- Pattern size : 25% Box size
- Viewing angle direction of color shift : Horizontal, Vertical
6. Viewing angle is the angle at which the contrast ratio is greater than 10. The angles are
determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which
is normal to the LCD surface. For more information see FIG.10
7. GSR is the rate of gamma shift at up, down, left and right 60 degree viewing angle compare with
center gamma. For more information see FIG.11 and FIG.12
- GSR (G
.
8. WPT (White Point Tracking) is the variation of color temperature between G255 and G63.
(By PR650)
u
Gamma
§
¨
¨
©
4
x
3122
yx
24
¦
i
1
)''(
'
vuAv g
) is defined as :
1 u
GSR
(By EZ Contrast)
'
v
)''(
'
ivu
24
9
y
3122
yx
(By PR880)
(By EZ Contrast)
Degree) 60Light Reft, Down, (Up, Value Gamma angle View
Degree) (0 Value GammaCenter
2
21
·
¸
100
¸
¹
2
)''()''('' vvuuvu '
21
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Notes 9. Gamma Value is approximately 2.2. For more information see Table 11.
Notes 10. It is the standard deviation of G to G (σ) data.
LM238WF1
Liquid Crystal Display
Xi = Individual Data
u = Data average
N : The number of Data
G to G (σ) =
√
Σ(Xi-u)
N
2
Notes 11. This is not used for product spec, but for end-user marketing purpose
Measuring point for surface luminance & measuring point for luminance variation.
H
V
V/2
V/10
P2
P5
P7
H/2
P3
P1
P8
H/10
P4
P6
P9
FIG.8 Measure Point for Luminance
The Gray to Gray response time is defined as the following figure and shall be measured by switching the input
signal for “Gray To Gray “.
- Gray step : 5 Step
- TGTG_AVR is the total average time at rising time and falling time for “Gray To Gray “.
- if system use ODC ( Over Driving Circuit) function, Gray to Gary response time may be 5ms~8ms GtG
* it depends on Overshoot rate.
Table. 10 GTG Gray Table
Gray to Gray
G255 G191 G127 G63 G0
Falling Time G255
G191
G127
G63
G0
Rising Time
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G to G(BW) Response time is defined as the following figure and shall be measured by switching the input
signal for “Gray(N)” and “Black or White”.
Tr
100
90
Optical
Response
10
0
Gray(N)
White
N = 0(Black)~255(White)
Color shift is defined as the following test pattern and color.
Gray(N)
Tf
Black
25% Box size
FIG.9 Color Shift Test Pattern
Average RGB values in Bruce RGB for Macbeth Chart
Dark skin (i=1) Light skin Blue sky Foliage Blue flower Bluish green
R 98 206 85 77 129 114
G 56 142 112 102 118 199
B 45 123 161 46 185 178
Orange Purplish blue Moderate red Purple Yellow green Orange yellow
R 219 56 211 76 160 230
G 104 69 67 39 193 162
B 24 174 87 86 58 29
Blue Green Red Yellow Magenta Cyan
R 26 72 197 241 207 35
G 32 148 27 212 62 126
B 145 65 37 36 151 172
White Neutral 8 Neutral 6.5 Neutral 5 Neutral 3.5 Black
R 240 206 155 110 63 22
G 240 206 155 110 63 22
B 240 206 155 110 63 22
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Dimension of viewing angle range.
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LM238WF1
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Product Specification
I
= 180q, Left
I
= 270q, Down
Normal
E
T
I
FIG.10 Viewing angle
Y
I
= 90q, Up
I
= 0q, Right
FIG.11 Sample Luminance vs. gray scale
(using a 256 bit gray scale)
r
LaVL
b
FIG.12 Sample Log-log plot of luminance
vs. gray scale
b
Here the Parameter α and γ relate the signal level V to the luminance L.
The GAMMA we calculate from the log-log representation (FIG.11)
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Table 11. Gray Scale Specification
Gray Level Relative Luminance [%] (Typ.)
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LM238WF1
Liquid Crystal Display
Product Specification
WG
X\G
ZXG
[^G
]ZG
^`G
`\G
XXXG
XY^G
X[ZG
X\`G
X^\G
X`XG
0.1
0.3
1.08
2.5
4.72
7.7
11.49
16.2
21.66
28.2
35.45
43.8
53.00
YW^G
YYZG
YZ`G
Y\\G
63.3
74.48
86.8
100
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5. Mechanical Characteristics
The contents provide general mechanical characteristics. In addition the figures in the next page are detailed
mechanical drawing of the LCD.
Horizontal 543.0mm
Outline Dimension
Bezel Area
Active Display Area
Weight Typ : 2,270g , Max : 2,385g
Surface Treatment
Vertical 317.4mm
Depth 11.2 mm
Horizontal 530.2mm
Vertical 299.6mm
Horizontal 527.04mm
Vertical 296.46mm
Hard coating(3H)
Anti-glare treatment of the front polarizer
Notes : Please refer to a mechanic drawing in terms of tolerance at the next page.
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<FRONT VIEW>
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Product Specification
Preliminary
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Reverse Panel
<REAR VIEW>
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Liquid Crystal Display
Product Specification
Preliminary
* Reverse Panel
LGD Highly recommendation :
As The IPS panel is sensitive & slim, please recommend the metal frame of the system supports the panel
by the double side-mount.
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6. Reliability
Environment test condition
No Test Item Condition
1 High temperature storage test Ta= 60¶C 240h
2 Low temperature storage test Ta= -20¶C 240h
3 High temperature operation test Ta= 50¶C 50%RH 240h
4 Low temperature operation test Ta= 0¶C 240h
Wave form : random
5
6
7 Humidity condition Operation Ta=
8
9
Vibration test
(non-operating)
Shock test
(non-operating)
Altitude
operating
storage / shipment
Maximum Storage Humidity for
4 corner light leakage Mura.
Vibration level : 1.00G RMS
Bandwidth : 10-300Hz
Duration : X, Y, Z, 10 min
One time each direction
Shock level : 100G
Waveform : half sine wave, 2ms
Direction : ᇹX, ᇹY, ᇹZ
One time each direction
0 - 10,000 feet(3,048m)
0 - 40,000 feet(12,192m)
Max 70%RH , Ta=40
40 ¶C ,90%RH
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7. International Standards
7-1. Safety
a) UL 60950-1, Underwriters Laboratories Inc.
Information Technology Equipment - Safety - Part 1 : General Requirements.
b) CAN/CSA C22.2 No.60950-1-07, Canadian Standards Association.
Information Technology Equipment - Safety - Part 1 : General Requirements.
c) EN 60950-1, European Committee for Electrotechnical Standardization (CENELEC).
Information Technology Equipment - Safety - Part 1 : General Requirements.
d) IEC 60950-1, The International Electrotechnical Commission (IEC).
Information Technology Equipment - Safety - Part 1 : General Requirements.
(Including report of IEC60825-1:2001 clause 8 and clause 9)
LM238WF1
Liquid Crystal Display
Notes
1. Laser (LED Backlight) Information
Class 1M LED Product
IEC60825-1 : 2001
Embedded LED Power (Class1M)
2. Caution
: LED inside.
Class 1M laser (LEDs) radiation when open.
Do not open while operating.
7-2. EMC
a) ANSI C63.4 “American National Standard for Methods of Measurement of Radio-Noise
Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz.”
American National Standards Institute (ANSI), 2003.
b) CISPR 22 “Information technology equipment – Radio disturbance characteristics – Limit and
methods of measurement." International Special Committee on Radio Interference
(CISPR), 2005.
c) CISPR 13 “Sound and television broadcast receivers and associated equipment – Radio disturbance
characteristics – Limits and method of measurement." International Special Committee on Radio
Interference (CISPR), 2006.
7-3. Environment
a) RoHS, Directive 2002/95/EC of the European Parliament and of the council of 27 January 2003
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8. Packing
8-1. Designation of Lot Mark
a) Lot Mark
A B C D E F G H I J K L M
A,B,C : SIZE(INCH) D : YEAR
E : MONTH F ~ M : SERIAL NO.
Note
1. YEAR
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LM238WF1
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Product Specification
Year
Mark
2. MONTH
Month
Mark
b) Location of Lot Mark
Serial No. is printed on the label. The label is attached to the backside of the LCD module.
This is subject to change without prior notice.
8-2. Packing Form
a) Package quantity in one box : 12 pcs
b) Box Size : 635 X 370 X 400
2016 G 2017 H 2018 J 2019
F
Jun 7 Jul 8 Aug 9 Sep
6
C B A
2014 E 2015
D
Apr 5 May
4
2013 2012 2011
2020
K
Oct
A
Nov
B
Dec Mar Feb Jan
C 3 2 1
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9. PRECAUTIONS
Please pay attention to the followings when you use this TFT LCD module.
9-1. MOUNTING PRECAUTIONS
(1) You must mount a module using holes arranged in four corners or four sides.
(2) You should consider the mounting structure so that uneven force (ex. Twisted stress) is 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.
(3) Please attach the surface transparent protective plate to the surface in order to protect the polarizer.
Transparent protective plate should have sufficient strength in order to the resist external force.
(4) You should adopt radiation structure to satisfy the temperature specification.
(5) 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.
(6) Do not touch, push or rub the exposed polarizers with glass, tweezers or anything harder than HB
pencil lead. And please do not rub with dust clothes with chemical treatment.
Do not touch the surface of polarizer for bare hand or greasy cloth.(Some cosmetics are detrimental
to the polarizer.)
(7) When the surface becomes dusty, please wipe gently with absorbent cotton or other soft materials like
chamois soaks with petroleum benzene. 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.
(8) Wipe off saliva or water drops as soon as possible. Their long time contact with polarizer causes
deformations and color fading.
(9) Do not open the case because inside circuits do not have sufficient strength.
(10) As The IPS panel is sensitive & slim, please recommend the metal frame of the system supports the panel
by the double side-mount.
9-2. OPERATING PRECAUTIONS
(1) The spike noise causes the mis-operation of circuits. It should be lower than following voltage :
V=·200mV(Over and under shoot voltage)
(2) Response time depends on the temperature.(In lower temperature, it becomes longer.)
(3) Brightness depends on the temperature. (In Higher temperature, it becomes lower.)
And in lower temperature, response time(required time that brightness is stable after turned on) becomes
longer.
(4) 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.
(5) When fixed patterns are displayed for a long time, remnant image is likely to occur.
(6) 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.
(7) Please do not give any mechanical and/or acoustical impact to LCM. Otherwise, LCM can’t be operated
its full characteristics perfectly.
(8) A screw which is fastened up the steels should be a machine screw.
(if not, it causes metallic foreign material and deal LCM a fatal blow)
(9) Please do not set LCD on its edge.
(10) When LCMs are used for public display defects such as Yogore, image sticking can not be guarantee.
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9-3. 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.
9-4. PRECAUTIONS FOR STRONG LIGHT EXPOSURE
Strong light exposure causes degradation of polarizer and color filter.
9-5. STORAGE
When storing modules as spares for a long time, the following precautions are necessary.
(1) 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.
(2) 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.
9-6. HANDLING PRECAUTIONS FOR PROTECTION FILM
(1) The protection film is attached to the bezel with a small masking tape.
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.
(2) 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 bezel after the protection film is peeled off.
(3) You can remove the glue easily. When the glue remains on the bezel surface or its vestige is recognized,
please wipe them off with absorbent cotton waste or other soft material like chamois soaked with normal hexane.
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