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LM270WQ1
Liquid Crystal Display
Product Specification
SPECIFICATION
FOR
APPROVAL
( ) Preliminary Specification
( ) Final Specification
Title 27.0" QHD TFT LCD
BUYER SUPPLIER LG Display Co., Ltd.
MODEL *MODEL LM270WQ1
SUFFIX SLA1
*When you obtain standard approval,
please use the above model name without suffix
SIGNATURE SIGNATURE
APPROVED BY APPROVED BY
DATE DATE
/ S. Y. Park / G.Manager
REVIEWED BY
/ S. J. So / Manager
PREPARED BY
/ S. R. Yoo / Engineer
Please return 1 copy for your confirmation with MNT Products Engineering Dept.
your signature and comments. LG Display Co., Ltd.
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LM270WQ1
Liquid Crystal Display
Product Specification
Contents
No ITEM Page
COVER 1
CONTENTS 2
RECORD OF REVISIONS 3
1 GENERAL DESCRIPTION 4
2 ABSOLUTE MAXIMUM RATINGS 5
3 ELECTRICAL SPECIFICATIONS 6
3-1 ELECTRICAL CHARACTERISTICS 6
3-2 INTERFACE CONNECTIONS 8
3-3 LVDS CHARACTERISTICS 11
3-4 SIGNAL TIMING SPECIFICATIONS 14
3-5 SIGNAL TIMING WAVEFORMS 15
3-6 COLOR INPUT DATA REFERNECE 16
3-7 POWER SEQUENCE & DIP CONDITION FOR LCD MODULE 17
3-8 POWER SEQUENCE & DIP CONDITION FOR LCD INVERTER 19
4 OPTICAL SPECIFICATIONS 20
5 MECHANICAL CHARACTERISTICS 26
6 RELIABLITY 29
7 INTERNATIONAL STANDARDS 30
7-1 SAFETY 30
7-2 EMC 30
7-3 ENVIRONMENT 30
8 PACKING 31
8-1 DESIGNATION OF LOT MARK 31
8-2 PACKING FORM 31
9 PRECAUTIONS 32
9-1 MOUNTING PRECAUTIONS 32
9-2 OPERATING PRECAUTIONS 32
9-3 ELECTROSTATIC DISCHARGE CONTROL 33
9-4 PRECAUTIONS FOR STRONG LIGHT EXPOSURE 33
9-5 STORAGE 33
9-6 HANDLING PRECAUTIONS FOR PROTECTION FILM 33
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LM270WQ1
Liquid Crystal Display
Product Specification
RECORD OF REVISIONS
Revision Revision
Page Description
No Date
0.0 Jan. 20. 2010 - First Draft (Preliminary)
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LM270WQ1
Liquid Crystal Display
Product Specification
1. General Description
The LM270WQ1 is a Color Active Matrix Liquid Crystal Display with 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 27inch diagonally measured
a c t i ve dis pla y a re a w i t h Q H D r e s o l u t io n ( 2 5 6 0 v e r t i c a l b y 1 4 4 0 h o ri zo n t a l 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 10-bit gray scale signal for each dot,
thus, presenting a palette of more than 1.07Billion colors with Advanced-FRC (Frame Rate Control).
It has been designed to apply the 10-bit 4 port LVDS interface.
It is intended to support displays where high brightness, super wide viewing angle, high color saturation,
and high color are important.
Mini-LVDS (RGB)
EEPROM
Source Driver Circuit
LVDS
2Port I2C
CN2 S1 S2560
(41pin)
G1
LVDS Timing
2Port Controller
MSTAR
Select
TFT - LCD Panel
Bit
Logic Power (2560 RGB 1440 pixels)
CN1
Select 3.3V / 1.8V
ODC (51pin) G1440
Select
+12.0V Power
Circuit Block
Vled B/L System (White LED)
General Features
Active Screen Size 26.96 inches (68.47cm) diagonal
Outline Dimension 630.0(H) x 376.13(V) x 21.8(D) mm (Typ.)
Pixel Pitch 0.2331 mm x 0.2331 mm
Pixel Format 2560 horiz. By 1440 vert. Pixels RGB stripes arrangement
Color Depth 1.07 Billion colors, 10Bit with A-FRC
Luminance, White 420 cd/m2 (1point)
Viewing Angle(CR>10) View Angle Free (R/L 178(Typ.), U/D 178(Typ.))
Total 90.85Watt (Typ.)
Power Consumption
(10.7Watt @VLCD, Max 80.15 Watt_Duty 100% of DC 350 mA_w/o driver)
Weight 4600 g (typ.)
Display Operating Mode Transmissive mode, normally black
Surface Treatment Glare (Low Reflection treatment of the front polarizer)
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LM270WQ1
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
Values
Parameter Symbol Units Notes
Min Max
Power Input Voltage VLCD -0.3 14 Vdc at 25 r 2 C
Operating Temperature TOP 0 50 C
Storage Temperature TST -20 60 C
1,2
Operating Ambient Humidity HOP 10 90 %RH
Storage Humidity HST 10 90 %RH
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. Storage condition is guaranteed under packing condition.
FIG.1 Temperature and relative humidity
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LM270WQ1
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, is typically generated by LED driver. The LED driver is an
external unit to the LCDs.
Table 2-1. ELECTRICAL CHARACTERISTICS
Values
Parameter Symbol Unit Notes
Min Typ Max
MODULE :
Power Supply Input voltage VLCD 11.4 12.0 12.6 Vdc
Permissive Power Input Ripple VdRF - 400 mVp-p
- (890) (1020) mA 1
Power Supply Input Current ILCD
- (1210) (1390) mA 2
Power Consumption PLCD - (10.7) (12.4) Watt 1
Rush Current IRUSH_VLCD - - 3.0 A 3
Note :
1. The specified current and power consumption are under the VLCD=12.0V, 25 r 2 C,fV=60Hz condition
whereas mosaic pattern(8 x 6) is displayed and fV is the frame frequency.
2. The current is specified at the maximum current pattern.
3. The duration of rush current is about 2ms and rising time of power Input is 1ms(min.).
FIG.2 pattern for Electrical characteristics
power consumption measurement power input ripple
White : 255Gray
Black : 0Gray Maximum current pattern
Mosaic Pattern(8 x 6) White Pattern
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LM270WQ1
Liquid Crystal Display
Product Specification
Table 2-2. LED Bar ELECTRICAL CHARACTERISTICS
Values
Parameter Symbol Condition Unit Notes
Min. Typ. Max.
LED : 1,7
LED String Current Is - 350 365 mA 2,7
LED String Voltage Vs 31 36 41 V 3,7
LED Bar Voltage VBar - 216 229 V 3,7
LED String Power Ps 10.85 12.6 14.35 Watt 4,6,7
LED Bar Power PBar - 75.6 80.15 Watt 4,6,7
LED Life Time LED_LT 30,000 - - Hrs 5,7
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.
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. Specified values are for a single LED bar including Left & Right Bar.
2. The specified current is input LED chip 100% duty current.
3. The specified voltage is input LED string and Bar voltage at typical 350 mA 100% duty current.
4. The specified power consumption is input LED string & bar power consumption at typical 350 mA
100% duty current.
5. The life is determined as the time at which luminance of the LED is 50% compared to that of initial
value at the typical LED current on condition of continuous operating at 25 r 2 C.
6. The LED bar power consumption shown above does not include loss of external driver.
The used LED bar current is the LED typical current.
String Power Consumption is calculated with PS = VS x Is
Bar Power Consumption is calculated with PL = VBarx Is
7. LED operating DC Forward Current and Junction Temperature must not exceed LED Max Ratings at 25 r 2 C.
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LM270WQ1
Liquid Crystal Display
Product Specification
3-2. Interface Connections
This LCD module employs two kinds of interface connection, 51-pin and 41-pin connectors are used for the
module electronics and 14-pin connectors are used for the integral backlight system.
3-2-1. LCD Module (CN1, CN2)
- LCD Connector(CN1): IS050-C51B-C39-A(manufactured by UJU) or FI-RE51S-HF(manufactured by JAE)
or compatible. Refer to below and next Page table.
- Mating Connector : FI-RE51HL(JAE) or compatible
Table 3-1. MODULE CONNECTOR(CN1) PIN CONFIGURATION
No Symbol Description No Symbol Description
1 GND Ground 27 Bit Select `H' = 10bit , `L' = 8bit
2 NC No Connection 28 R2AN SECOND LVDS Receiver Signal (A-)
3 NC No Connection 29 R2AP SECOND LVDS Receiver Signal (A+)
4 NC No Connection 30 R2BN SECOND LVDS Receiver Signal (B-)
5 NC No Connection 31 R2BP SECOND LVDS Receiver Signal (B+)
6 ODC Select `H' or NC = Enable , `L' = Disable 32 R2CN SECOND LVDS Receiver Signal (C-)
7 LVDS Format `H'= MSTAR Concept , `L'=normal 33 R2CP SECOND LVDS Receiver Signal (C+)
8 NC No Connection 34 GND Ground
9 PWM_OUT Reference signal for inverter control 35 R2CLKN SECOND LVDS Receiver Clock Signal(-)
10 NC No Connection 36 R2CLKP SECOND LVDS Receiver Clock Signal(+)
11 GND Ground 37 GND Ground
12 R1AN FIRST LVDS Receiver Signal (A-) 38 R2DN SECOND LVDS Receiver Signal (D-)
13 R1AP FIRST LVDS Receiver Signal (A+) 39 R2DP SECOND LVDS Receiver Signal (D+)
14 R1BN FIRST LVDS Receiver Signal (B-) 40 R2EN SECOND LVDS Receiver Signal (E-)
15 R1BP FIRST LVDS Receiver Signal (B+) 41 R2EP SECOND LVDS Receiver Signal (E+)
16 R1CN FIRST LVDS Receiver Signal (C-) 42 Reserved No connection or GND
17 R1CP FIRST LVDS Receiver Signal (C+) 43 Reserved No connection or GND
18 GND Ground 44 GND Ground
19 R1CLKN FIRST LVDS Receiver Clock Signal(-) 45 GND Ground
20 R1CLKP FIRST LVDS Receiver Clock Signal(+) 46 GND Ground
21 GND Ground 47 NC No connection
22 R1DN FIRST LVDS Receiver Signal (D-) 48 VLCD Power Supply +12.0V
23 R1DP FIRST LVDS Receiver Signal (D+) 49 VLCD Power Supply +12.0V
24 R1EN FIRST LVDS Receiver Signal (E-) 50 VLCD Power Supply +12.0V
25 R1EP FIRST LVDS Receiver Signal (E+) 51 VLCD Power Supply +12.0V
26 Reserved No connection or GND - - -
Notes : 1. All GND(ground) pins should be connected together to the LCD module's metal frame.
2. All VLCD (power input) pins should be connected together.
3. All Input levels of LVDS signals are based on the EIA 644 Standard.
4. Specific pins(pin No. #2~#6) are used for internal data process of the LCD module.
If not used, these pins are no connection.
5. LVDS pin (pin No. #24,25,40,41) are used for 10Bit(D) of the LCD module.
If used for 8Bit(R), these pins are no connection.
6. Specific pin No. #44 is used for "No signal detection" of system signal interface.
It should be GND for NSB(No Signal Black) during the system interface signal is not.
If this pin is "H", LCD Module displays AGP(Auto Generation Pattern).
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LM270WQ1
Liquid Crystal Display
Product Specification
- LCD Connector(CN2): IS050-C41B-C39-A(manufactured by UJU) or FI-RE41S-HF(manufactured by JAE)
or compatible. Refer to below table.
- Mating Connector : FI-RE41HL or compatible.
Table 3-2. MODULE CONNECTOR(CN2) PIN CONFIGURATION
No Symbol Description No Symbol Description
1 NC No connection(Reserved) 22 R3EN THIRD LVDS Receiver Signal (E-)
2 NC No connection 23 R3EP THIRD LVDS Receiver Signal (E+)
3 NC No connection 24 GND Ground
4 NC No connection 25 GND Ground
5 NC No connection 26 R4AN FORTH LVDS Receiver Signal (A-)
6 NC No connection 27 R4AP FORTH LVDS Receiver Signal (A+)
7 NC No connection 28 R4BN FORTH LVDS Receiver Signal (B-)
8 NC No connection 29 R4BP FORTH LVDS Receiver Signal (B+)
9 GND Ground 30 R4CN FORTH LVDS Receiver Signal (C-)
10 R3AN THIRD LVDS Receiver Signal (A-) 31 R4CP FORTH LVDS Receiver Signal (C+)
11 R3AP THIRD LVDS Receiver Signal (A+) 32 GND Ground
12 R3BN THIRD LVDS Receiver Signal (B-) 33 R4CLKN FORTH LVDS Receiver Clock Signal(-)
13 R3BP THIRD LVDS Receiver Signal (B+) 34 R4CLKP FORTH LVDS Receiver Clock Signal(+)
14 R3CN THIRD LVDS Receiver Signal (C-) 35 GND Ground
15 R3CP THIRD LVDS Receiver Signal (C+) 36 R4DN FORTH LVDS Receiver Signal (D-)
16 GND Ground 37 R4DP FORTH LVDS Receiver Signal (D+)
17 R3CLKN THIRD LVDS Receiver Clock Signal(-) 38 R4EN FORTH LVDS Receiver Signal (E-)
18 R3CLKP THIRD LVDS Receiver Clock Signal(+) 39 R4EP FORTH LVDS Receiver Signal (E+)
19 GND Ground 40 GND Ground
20 R3DN THIRD LVDS Receiver Signal (D-) 41 GND Ground
21 R3DP THIRD LVDS Receiver Signal (D+) -
Notes : 1. All GND(ground) pins should be connected together to the LCD module's metal frame.
2. LVDS pin (pin No. #22,23,38,39) are used for 10Bit(D) of the LCD module.
If used for 8Bit(R), these pins are no connection.
[CN1]
#1
CN1 #51 #1
CN2 #41 - Part/No. : IS050-C51B-C39-A(UJU)
- Mating connector : FI-RE51HL
(Manufactured by JAE)
[CN2]
#1 #51 #1 #41 - Part/No. : IS050-C41B-C39-A(UJU)
- Mating connector : FI-RE41HL
(Manufactured by JAE)
Rear view of LCM
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LM270WQ1
Liquid Crystal Display
Product Specification
3-2-2. Backlight Interface
- LED Connector : H401K-D12N-12B (Manufactured by E&T)
- Mating Connector : 4530K-F12N-01R (Manufactured by E&T)
Table 5. LED CONNECTOR PIN CONFIGULATION
Pin No. Symbol Description Note
1 L_LED1+ LED channel 1 Anode
2 L_LED1- LED channel 1 Cathode
3 L_LED2+ LED channel 2 Anode
Left bar
4 L_LED2- LED channel 2 Cathode
5 L_LED3+ LED channel 3 Anode
6 L_LED3- LED channel 3 Cathode
7 R_LED1+ LED channel 1 Anode
8 R_LED1- LED channel 1 Cathode
9 R_LED2+ LED channel 2 Anode
Right bar
10 R_LED2- LED channel 2 Cathode
11 R_LED3+ LED channel 3 Anode
12 R_LED3- LED channel 3 Cathode
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LM270WQ1
Liquid Crystal Display
Product Specification
3-3. LVDS characteristics
3-3-1. DC Specification
Description Symbol Min Max Unit Notes
LVDS Differential Voltage |VID| 200 600 mV -
LVDS Common mode Voltage VCM 1.0 1.5 V -
LVDS Input Voltage Range VIN 0.7 1.8 V -
Change in common mode Voltage VCM - 250 mV -
3-3-2. AC Specification
Tclk
LVDS Clock
LVDS Data
t SKEW ( F clk =1 /Tclk )
t SKEW
Description Symbol Min Max Unit Notes
LVDS Clock to Data Skew Margin tSKEW - (0.25*tCLK)/7 + (0.25*tCLK)/7 ps
LVDS Clock to Clock Skew Margin tSKEW_EO - 1/7 + 1/7 Tclk -
Effective time of LVDS teff 520 ps -
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LM270WQ1
Liquid Crystal Display
Product Specification
- LVDS Effective Period
260ps
0.5*tc/7 tc/7
LVDS
data+
Vcm l VID l Vfsw
LVDS
Data- 260ps
teff
LVDS
Clock+
Vcm
LVDS
Clock-
- tc/7 : Unit Interval
- tc : Clock Period
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LM270WQ1
Liquid Crystal Display
Product Specification
3-3-3. LVDS Data format (Bit Select)
Bit Select "H" : 10Bit Data-Mapping (VESA format)
RCLKP
RCLKM
RAP R11' R10' G10 R15 R14 R13 R12 R11 R10 G10"
RBP G12' G11' B11 B10 G15 G14 G13 G12 G11 B15"
RCP B13' B12' DE VSYNC HSYNC B15 B14 B13 B12 DE"
RDP R17' R16' X B17 B16 G17 G16 R17 R16 X"
REP R19' R18' X B19 B18 G19 G18 R19 R18 X"
Bit Select "L" : 8Bit Data-Mapping (VESA format)
RCLKP
RCLKM
RAP R11' R10' G10 R15 R14 R13 R12 R11 R10 G10"
RBP G12' G11' B11 B10 G15 G14 G13 G12 G11 B15"
RCP B13' B12' DE VSYNC HSYNC B15 B14 B13 B12 DE"
RDP R17' R16' X B17 B16 G17 G16 R17 R16 X"
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LM270WQ1
Liquid Crystal Display
Product Specification
3-4. Signal Timing Specifications
All of the interface signal timing should be satisfied with the following specifications for it's proper operation.
Table 4. TIMING TABLE (VESA COORDINATED VIDEO TIMING)
Parameter Symbol Min. Typ. Max. Unit Notes
Period tCLK 16.46 16.56 16.67 ns Pixel frequency
DCLK : Typ.241.5MHz
Frequency fCLK 60 60.38 60.75 MHz
Period tHP 678 680 682
Hsync tCLK
Width-Active tWH 8 8 8
Period tVP 1479 1481 1483 tHP
Vsync Frequency fV 59.38 59.95 60.12 Hz
Width-Active tWV 5 5 5 tHP
Horizontal Valid tHV 640 640 640
Horizontal Back Porch tHBP 18 20 22 tCLK
Horizontal Front Porch tHFP 10 12 14
Data Horizontal Blank - 36 40 44 tWH+ tHBP+ tHFP
Enable Vertical Valid tVV 1440 1440 1440
Vertical Back Porch tVBP 32 33 34
tHP
Vertical Front Porch tVFP 2 3 4
Vertical Blank - 39 41 43 tWV+ tVBP+ tVFP
Note:
1. DE Only mode operation. The input of Hsync & Vsync signal does not have an effect
on LCD normal operation.
2. The performance of the electro-optical characteristics may be influenced by variance of the
vertical refresh rates.
3. Horizontal period should be even.
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LM270WQ1
Liquid Crystal Display
Product Specification
3-5. Signal Timing Waveforms
0.7VDD
Hsync, Vsync, DE, DATA
0.3VDD
tCLK
0.5VDD
Dclk
VALID
INVALID INVALID
DATA
DE(Data Enable)
Data are latched at the falling edge of DCLK
tHP
Hsync tWH
tHBP tHV tHFP
DE(Data Enable)
tVP
tWV
Vsync
tVBP tVV tVFP
DE(Data Enable)
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LM270WQ1
Liquid Crystal Display
Product Specification
3-6. Color Data Reference
The Brightness of each primary color(red,green,blue) is based on the 10-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 5. COLOR DATA REFERENCE
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LM270WQ1
Liquid Crystal Display
Product Specification
3-7. Power Sequence & Dip condition for LCD Module
3-7-1. Power Sequence
90% 90%
Power Supply For LCD
10% 10%
0V
VLCD
T1 T7
Valid Data
T2 T5
30% Invalid Invalid
Interface Signal (Tx) Data Data
0V
T3 T4
Option Signal T8 T9
(LVDS_select, BIT_select)
Lamp On
Power for Lamp
Table 6. Power sequence
Values
Parameter Units
Min Typ Max
T1 0.5 - 10 ms
T2 0.5 - 50 ms
T3 500 - - ms
T4 200 - - ms
T5 0.01 - 50 ms
T7 1 - s
T8 0.5 - T2 ms
T9 0 - - ms
Notes :
1. Please VLCD power on only after connecting interface cable to LCD.
2. Please avoid floating state of interface signal at invalid period.
3. When the interface signal is invalid, be sure to pull down the power supply for
LCD VLCD to 0V.
4. Lamp power must be turn on after power supply for LCD an interface signal are valid.
5. If the on time of signals (Interface signal and Option signals) precedes the on time of Power (VLCD),
it will be happened abnormal display.
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LM270WQ1
Liquid Crystal Display
Product Specification
3-7-2. VLCD Power Dip Condition
VLCD
VLCD_dip
td
Notes :
Dip condition
VLCD_dip VLCD_typ X 0.2, td 20ms
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LM270WQ1
Liquid Crystal Display
Product Specification
4. Optical Specifications
Optical characteristics are determined after the unit has been `ON' for approximately 70 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. 2 presents additional information concerning the measurement equipment and method.
Pritchard 880
LCD Module
Optical Stage(x,y) or equivalent
50cm
FIG. 3 Optical Characteristic Measurement Equipment and Method
Table 8. OPTICAL CHARACTERISTICS (Ta=25 C, VLCD=12.0V, fV=60Hz Dclk=241.5MHz)
Values
Parameter Symbol Units Notes
Min Typ Max
Contrast Ratio CR 700 1000 - 1
Surface Luminance, white LWH 330 420 - cd/m2 2
Luminance Variation G WHITE 75 % 3
TGTG_AVR - 6 - ms 4
Response Time Gray to Gray
TGTG_MAX - - 12 ms 4
RED Rx 0.652
Ry 0.334
GREEN Gx 0.304
Color Coordinates Gy Typ 0.619 Typ
[CIE1931] BLUE Bx -0.03 0.148 +0.03
By 0.049
WHITE Wx 0.308
Wy 0.325
Horizontal TCST_H - 178 -
Color Shift Degree 5
Vertical TCST_V - 178 -
Viewing Angle (CR>10)
Horizontal TH 170 178 -
General Degree 6
Vertical TV 170 178 -
Horizontal TGMA_H 178 -
Effective Degree 7
Vertical TGMA_V 178 -
Gray Scale 2.2 8
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LM270WQ1
Liquid Crystal Display
Product Specification
Notes 1. Contrast Ratio(CR) is defined mathematically as :
Surface Luminance with all white pixels
Contrast Ratio
Surface Luminance with all black pixels
It is measured at center point(Location P1)
2. Surface luminance(LWH)is luminance value at No.1 point across the LCD surface 50cm
from the surface with all pixels displaying white. For more information see FIG 4.
3. The variation in surface luminance , G WHITE is defined as :
Minimum(L P1 , L P2 , }.. L P9 )
GWHITE u 100
Maximum (L P1 , L P2 , .... L P9 )
Where L1 to L9 are the luminance with all pixels displaying white at 9 locations.
For more information see FIG 4.
4. Gray to gray response time is the time required for the display to transition from gray to gray.
For additional information see Table 9.
5. Color shift is the angle at which the color difference is lower than 0.04.
For more information see FIG 5.
- Color difference ( u'v')
4x 9y
u' v'
2 x 12 y 3 2 x 12 y 3
u'1, v'1 : u'v' value at viewing angle direction
2 2
'u ' v' (u '1 u '2 ) (v'1 v'2 ) u'2, v'2 : u'v' value at front ( =0)
- 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 6.
7. Effective viewing angle is the angle at which the gamma shift of gray scale is lower than 0.3.
For more information see FIG 7 and FIG 8.
8. Gray scale specification
Gamma Value is approximately 2.2. For more information see Table 10.
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LM270WQ1
Liquid Crystal Display
Product Specification
Measuring point for surface luminance & measuring point for luminance variation.
H
H
H/2 H/10
H/2
2 3 4
V/2 V/2
V 5 6 V
1
V/10 7 8 9
Active Area H : 596.74 mm
V : 335.66 mm
@ H,V : Active Area
FIG. 4 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".
- TGTG_MAX is the max time at rising time or falling time for "Gray To Gray".
Table 9. Gray to gray response time table
Rising Time
Gray to Gray
G255 G191 G127 G63 G0
G255
G191
Falling Time G127
G63
G0
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Color shift is defined as the following test pattern and color.
25% Box size
FIG. 5 Test Pattern
Average RGB values in Bruce RGB for Macbeth Chart
Dark skin 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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LM270WQ1
Liquid Crystal Display
Product Specification
Dimension of viewing angle range.
Normal
E Y
I = 90q, Up
I = 180q, Left
T
I
I = 0q, Right
I = 270q, Down
FIG. 6 Viewing angle
FIG. 7 Sample Luminance vs. gray scale FIG. 8 Sample Log-log plot of luminance
(using a 256 bit gray scale) vs. gray scale
L aV r Lb log( L Lb ) r log(V ) log(a )
Here the Parameter and relate the signal level V to the luminance L.
The GAMMA we calculate from the log-log representation (FIG. 7)
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LM270WQ1
Liquid Crystal Display
Product Specification
Table 10. Gray Scale Specification
Gray Level Relative Luminance [%] (Typ.)
0 0.10
31 1.08
63 4.71
95 11.5
127 21.7
159 35.5
191 53.1
223 74.5
255 100
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LM270WQ1
Liquid Crystal Display
Product Specification
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 630.0mm
Outline Dimension Vertical 376.13mm
Depth 21.8mm
Horizontal 601.8mm
Bezel Area
Vertical 340.6mm
Horizontal 596.74mm
Active Display Area
Vertical 335.66mm
Weight 4,600g (Typ.)
Hard coating(2H)
Surface Treatment
Glare, Low Reflection treatment of the front polar