LG LM-185WH1-TLB1 Service manual

SPECIFICATION

(◆) Preliminary Specification
( ) Final Specification

LM185WH1

Liquid Crystal Display

Product Specification

FOR

APPROVAL

18.5” WXGA TFT LCDTitle

BUYER

MODEL

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SIGNATURE DATE

/

/

/

HP

SUPPLIER LG Display Co., Ltd.

*MODEL LM185WH1

SUFFIX TLB1

*When you obtain standard approval,

please use the above model name without suffix

APPROVED BY

G.T. KIM / G.Manager

REVIEWED BY

K.H. Hwang / Manager [C]

J. H. Lee / Manager [M]

Y.S. Lee / Manager [P]

PREPARED BY

S.U. Byun/ Engineer

DATE

Please return 1 copy for your confirmation
With your signature and comments.

Ver. 0.0 OCT., 29, 2008

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Product Engineering Dept.

LG Display Co., Ltd

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Product Specification

Contents

LM185WH1

Liquid Crystal Display

No

COVER
CONTENTS
RECORD OF REVISIONS
GENERAL DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL SPECIFICATIONS

1)

ELECTRICAL CHARACTERISTICS

2)

INTERFACE CONNECTIONS

3)

LVDS characteristics

4)

SIGNAL TIMING SPECIFICATIONS

5)

SIGNAL TIMING WAVEFORMS

6)

COLOR INPUT DATA REFERNECE

7)

POWER SEQUENCE

8)

POWER DIP CONDITION
OPTICAL SFECIFICATIONS

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MECHANICAL CHARACTERISTICS

ITEM

Page

1
2
3
41
52
63
6

9
12
15

16
17
18
19
204
255

RELIABILITY
INTERNATIONAL STANDARDS

1)

SAFETY

2)

EMC
PACKING

1)

DESIGNATION OF LOT MARK

2)

PACKING FORM

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286
297
29
29
308
30
30
31PRECAUTIONS9
31MOUNTING PRECAUTIONS1)
31OPERATING PRECAUTIONS2)
32ELECTROSTATIC DISCHARGE CONTROL3)
32PRECAUTIONS FOR STRONG LIGHT EXPOSURE4)
32STROAGE5)
32HANDLING PRECAUTIONS FOR PROTECTION FILM6)

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Product Specification

Record of revisions

Revision No DescriptionDate Page

Ver0.0 Preliminary SpecificationsOCT,29,2008

LM185WH1

Liquid Crystal Display

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LM185WH1

Liquid Crystal Display

Product Specification

1. General description

LM185WH1-TLB1 is a Color Active Matrix Liquid Crystal Display with an integral Cold Cathode
Fluorescent Lamp(CCFL) backlight system. The matrix employs a-Si Thin Film Transistor as the
active element. It is a transmissive type display operating in the normally white mode. It has a

19.0 inch diagonally measured active display area with WXGA resolution (768 vertical by 1366
horizontal 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 Advanced-FRC(Frame Rate Control). It has been designed to apply the interface method
that enables low power, high speed, low EMI. FPD Link or compatible must be used as a
LVDS(LowVoltage Differential Signaling) chip. It is intended to supportapplications where thin
thickness, wide viewing angle, low power are critical factors and graphic displays are important.
In combination with the vertical arrangement of the sub-pixels, the LM185WH1-TLB1
characteristics provide an excellent flat panel display for office automation products such as
monitors.

FIG. 1 Block diagram

RGB

Source driver circuit

S1366

LVDS

pair #1

S1

G1

Timing

controller

TFT-LCD Panel

CN1

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General features

Active screen size 18.51 inches (470.1mm) diagonal
Outline Dimension 430.4(H) x 254.6(V) x 13.0(D) mm(Typ.)
Pixel Pitch 0.10*RGB(H)mmx 0.30(V)mm
Pixel Format 1366 horizontal By 768 vertical Pixels. RGB stripe arrangement
Interface LVDS 1Port
Color depth 16.7M colors

+5V

CN2 (2pin)
CN3 (2pin)

VLCD

Power circuit

block

(1366×RGB×768 pixels)

G768

Backlight assembly (2 CCFLs)

Luminance, white 300 cd/m2 ( Center 1Point, typ)
Viewing Angle (CR>10) R/L 170(Typ.), U/D 160(Typ.)
Power Consumption
Weight 1550 g (Typ.)
Display operating mode Transmissive mode, Normally White
Surface treatments Hard coating (2H), glare treatment of the front polarizer

Ver. 0.0 OCT., 29, 2008

Total 13.48W(Typ.), (2.98 W@V

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, 10.50 W@IBL= 7.5 mA)

LCD

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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

LM185WH1

Liquid Crystal Display

Parameter Notes

Power Supply Input Voltage
Operating Temperature
Storage Temperature
Operating Ambient Humidity
Storage Humidity

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.

FIG. 2 Temperature and relative humidity

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Wet Bulb
Temperature [℃]

10

0

Symbol

LCD

OP

ST

OP

ST

50

40

30

20

Values

MaxMin

90%

60

60%

40%

10%

Units

°C500T
°C60-20T

%RH9010H
%RH9010H

Storage

Operation

Humidity

[(%)RH]

At 25℃Vdc+6.0-0.3V

1

10 20 30 40 50 60 70 800-20
Dry Bulb Temperature [℃]

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LM185WH1

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 CCFL/Backlight, is typically
generated by an inverter. The inverter is an external unit to the LCDs.

Table 2. Electrical characteristics

Parameter Symbol

MODULE :
Power Supply Input Voltage
Permissive Power Input Ripple

Power Supply Input Current

Power Consumption
Inrush current

Note :

1. The specified current and power consumption are
under the VLCD=5.0V, 25 ± 2°C,fV=60Hz condition
whereas mosaic pattern(8 x 6) is displayed and fVis the frame frequency.

2. The current is specified at the maximum current pattern.

3. Permissive power ripple should be measured under VCC=5.0V, 25°C, fV(frame frequency)=75Hz

conditionand At that time, we recommend the bandwidth configuration of oscilloscope
is to be under 20MHz.

4. The duration of rush current is about 5ms and rising time of power Input is 500us ± 20%.

FIG.3 pattern for Electrical characteristics

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LCD

LCD

LCD-MOSAIC

I

LCD-BLACK

LCD

RUSH

Values

MaxTypMin

Vdc5.55.04.5V

NotesUnit

3V0.2--V
1mA685595-I
2mA805700­1Watt3.422.98-P
4A3.0--I

power consumption measurement

White : 255Gray
Black : 0Gray

Mosaic Pattern(8 x 6)

Ver. 0.0 OCT., 29, 2008

power input ripple

Full Black Pattern

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Product Specification

Table 3. Electrical characteristics

LM185WH1

Liquid Crystal Display

Parameter Symbol

LAMP :

Operating Voltage
Operating Current

at 25 °C

at 0 °C
Operating Frequency
Discharge Stabilization Time
Power Consumption

Note :

The design of the inverter must have specifications for the lamp in LCD Assembly.
The performance of the Lamp in LCM, for example life time orbrightness, is extremely influenced
by the characteristics of the DC-AC inverter. So all the parameters of an inverter should be carefully
designed so as not to produce too much leakage current from high-voltage output of the inverter.
When you design or order the inverter, please make sure unwanted lighting caused by the mismatch of
the lamp and the inverter (no lighting, flicker, etc) never occurs. When you confirm it, the LCD–Assembly
should be operated in the same condition as installed in youinstrument.

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V

BL

BL

BL

S

BL

685

(8.0mA)

Values

700

(7.5mA)

MaxTypMin

860

(3.0mA)

8.07.53.0I

1250
1550

V
V

RMS

RMS

RMS
RMS

NotesUnit

1, 2V

1mA

1, 3VsEstablished Starting Voltage

4kHz706040f

1, 5Min3--T

6Watt10.9610.50P

1, 7Hrs-50,000Life Time

※ Do not attach a conducting tape to lamp connecting wire. If the lamp wire attach to a conducting tape,

TFT-LCD Module has a low luminance and the inverter has abnormal action.
Because leakage current is occurred between lamp wire and conducting tape.

1. Specified values are for a single lamp.

2. Operating voltage is measured at 25 ± 2°C. The variance of the voltage is ± 10%.

3. The voltage above VSshould be applied to the lamps for more than 1 second for start-up.
(Inverter open voltage must be more than lamp startingvoltage.)

Otherwise, the lamps may not be turned on. The used lamp current is the lamp typical current.

4. Lamp frequency may produce interface with horizontal synchronous frequency and as a result

this may cause beat on the display. Therefore lamp frequency shall be as away possible from
the horizontal synchronous frequency and from its harmonics in order to prevent interference.

5. Let’s define the brightness of the lamp after being lighted for 5 minutes as 100%.

TSis the time required for the brightness of the center of the lamp to be not less than 95%.

6. The lamp power consumption shown above does not include loss of external inverter.

The used lamp current is the lamp typical current. (PBL= VBLx IBLx N

7. The life is determined as the time at which brightness of thelamp is 50% compared to that

of initial value at the typical lamp current on condition of continuous operating at 25 ± 2°C.

Lamp

)

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Product Specification

Note :

8. The output of the inverter must have symmetrical(negative and positive) voltage

waveform and symmetrical current waveform (Unsymmetricalratio is less than 10%).
Please do not use the inverter which has unsymmetrical voltage and unsymmetrical
current and spike wave. Requirements for a system inverter design, which is intended to
have a better display performance, a better power efficiency and a more reliable lamp,
are following.It shall help increase the lamp lifetime and reduce leakage current.

a. The asymmetry rate of the inverter waveform should be less than 10%.
b. The distortion rate of the waveform should be within √2 ±10%.

* Inverter output waveform had better be more similar to ideal sine wave.

* Asymmetry rate:

I p

| I p– I –p| / I

rms

x 100%

LM185WH1

Liquid Crystal Display

I -p

9. The inverter which is combined with this LCM, is highly recommended to connect
coupling(ballast) condenser at the high voltage output side. When you use the inverter
which has not coupling(ballast) condenser, it may cause abnormal lamp lighting because
of biased mercury as time goes.

10.In case of edgy type back light with over 2 parallel lamps, input current and voltage
wave form should be synchronized

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* Distortion rate

I p(or I –p) / I

rms

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Product Specification

3-2. Interface connections

LCD connector(CN1) : IS100-L30B-C23 (UJU), 187024-30091 (P-TWO)
Mating connector : FI-X30H and FI-X30HL (JAE) or Equivalent

Table 4. Module connector(CN1) pin configuration

LM185WH1

Liquid Crystal Display

Pin No

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

Symbol Description

NC

PWM_OUT

NC
GND
RX0­RX0+
GND
RX1­RX1+
GND
RX2­RX2+
GND

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RXCLK­RXCLK+
GND
RX3­RX3+
GND
NC
NC
NC
GND
GND
GND
VLCD
VLCD
VLCD

VLCD

VLCD

No Connection (AGP)
Reference signal for inverter control
No Connection (For LCD internal use only.)
Ground
Minus signal of channel 0 (LVDS)
Plus signal of channel 0 (LVDS)
Ground
Minus signal of channel 1 (LVDS)
Plus signal of channel 1 (LVDS)
Ground
Minus signal of channel 2 (LVDS)
Plus signal of channel 2 (LVDS)
Ground
Minus signal of clock channel (LVDS)
Plus signal of clock channel (LVDS)
Ground
Minus signal of channel 3 (LVDS)
Plus signal of channel 3 (LVDS)
Ground
No Connection (For LCD internal use only.)
No Connection (For LCD internal use only.)
No Connection (For LCD internal use only.)
Ground
Ground
Ground
Power Supply (5.0V)
Power Supply (5.0V)
Power Supply (5.0V)
Power Supply (5.0V)
Power Supply (5.0V)

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FIG. 4 Connector diagram

#1 #30

PWM signal

#1 #30

LM185WH1

Liquid Crystal Display

Product Specification

187024-30091 (P-TWO)

signal pairs

Power(5V)

Note:

Rear view of LCM

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1. NC: No Connection.

2. All GND(ground) pins should be connected together and to Vss which should also
be connected to the LCD’s metal frame.

3. All V

4. Input Level of LVDS signal is based on the IEA 664 Standard.

5. PWM_OUT is a reference signal for inverter control.
This PWM signal is synchronized with vertical frequency.
Its frequency is 3 times of vertical frequency, and its duty ratio is 50%.
If the system don’t use this pin, do not connect.

(power input) pins should be connected together.

LCD

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