LG LP-141X3 Service manual
LG Electronics, Inc.
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( ) Preliminary Specification
LP141X3
Liquid Crystal Display
Product Specification
SPECIFICATION
For
APPROVAL
( ) Final Specification
Title 14.1” XGA TFT LCD
BUYER NAME SUPPLIER LG Electronics Inc.
MODEL NAME MODEL NAME LP141X3
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SIGNATURE DATE SIGNATURE DATE
APPROVED BY
REVIEWED BY
PREPARED BY
Please return 1 copy for our confirmation
with your signature and comments.
Revision Ver 1.0 05/ February /1998 Page1/19
Product Engineering Dept.
LCD DIVISION LG Electronics, Inc.
LG Electronics, Inc.
LP141X3
Product Specification
TABLE of CONTENTS
NO. ITEM Page
- COVER 1/19
- TABLE of CONTENTS 2/19
- RECORD of REVISION 3/19
1. GENERAL DESCRIPTION 4/19
2. MAXIMUM RATINGS 5/19
3. ELECTRICAL SPECIFICATIONS 5/19
4. OPTICAL SPECIFICATIONS 6/19
5. INTERFACE CONNECTIONS 7/19
6. SIGNAL TIMING SPECIFICATIONS 9/19
7. SIGNAL TIMING WAVE FORMS 10/19
8. COLOR INPUT DATA REFERENCE 11/19
9. POWER SEQUENCE 12/19
10. MECHANICAL CHARACTERISTICS 13/19
11. HANDLING PRECAUTIONS 15/19
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- APPENDIX 18/19
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Revision Ver 1.0 05/ February /1998 Page2/19
LG Electronics, Inc.
Product Specification
Record of Revision
DATE AND VERSION DESCRIPTION
LP141X3
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Revision Ver 1.0 05/ February /1998 Page3/19
LG Electronics, Inc.
LP141X3
Product Specification
1. General Description
The LG Electronics model LP141X3 LCD is a Color Active Matrix Liquid Crystal Display with an integral Cold Cathode
Fluorescent Tube(CCFT) back light 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. This TFT-LCD has a 14.1 inch diagonally measured active
display area with XGA resolution(768 vertical by 1024 horizontal pixel array). Each pixel is divided into Red, Green and Blue subpixels or dots which are arranged in vertical stripes. Gray scale or the brightness of the sub-pixel color is determined with a 6-bit
gray scale signal for each dot, thus, presenting a pallet of more than 262,144 colors.
The LP141X3 LCD is intended to support applications where low power consumption, weight and thickness are critical factors and
graphic displays are important. In combination with the vertical arrangement of the sub-pixels, the LP141X3 characteristics provide
an excellent flat panel display for office automation products such as portable computers.
This LCM has SN75LVDS86 LVDS Interface supplied by TI Japan.
LP141X3 BLOCK DIAGRAM
VDD
GND
Rin0 -
Rin0 +
Rin1 -
Rin1 +
Rin2 -
Rin2 +
CLK -
CLK +
User Connector
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CN2
Power Supply
LVDS Reciever
Timing
Controller
Block
Control
Signal
Data & Control Signal
General Display Characteristics
The following are general feature of the model LP141X3 LCD;
Active display area
Outsize dimensions
Pixel pitch
Pixel format
Color depth
Display operating mode
Surface treatment
Row Driver
14.1 inch XGA
( 1024 x RGB x 768 )
Column Driver
Back light Assembly
14.1 inch diagonal
298.5 W x 227.0H x 7.5 D mm Typ.
0.28 mm x 0.28 mm
1024 horiz. By 768 vert. pixels
RGB stripe arrangement
6-bit
transmissive mode, normally white
hard coating(3H),
anti-glare treatment of the front polarizer
Revision Ver 1.0 05/ February /1998 Page4/19
LG Electronics, Inc.
Liquid Crystal Display
Product Specification
LP141X3
2. 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 Values Units Notes
Min. Max.
Power Input Voltage
Logic Input Voltage
Operating Temperature
Storage Temperature
Note: 1. The Relative Humidity must not exceed 80% non-condensing at temperatures of 40 Cor less.
At temperatures greater than 40 C, the wet bulb temperature must not exceed 39 C.
At low temperature the brightness of CCFL drop and the life time of CCFL become to be short.
2. Under no condition should the unit be exposed to corrosive chemicals.
V
DD
V
L/H
T
OP
T
ST
0
-0.3
0
-20
V
3.63
+0.3
DD
+40
+60
Vdc
Vdc
C
C
at 25 C
at 25 C
1
1
3. Electrical Specifications
The LP141X3 requires two power inputs. One is employed to power the LCD electronics and to derive
the voltages to drive the TFT array and liquid crystal. The second input which powers the backlight CCFT,
is typically generated by an inverter. The inverter is an external unit to the LCD.
Table 2 ELECTRICAL CHARACTERISTICS:
Parameter Symbol Values Units Notes
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MODULE:
Power Supply Input Voltage
Power Supply Input Current
Ripple/Noise
Differential input voltage, High
for receiver threshold, Low
BACKLIGHT
Backlight Input voltage
Backlight Current
Lamp Kick-Off Voltage
Operating Frequency
CCFL Life Time
Notes: 1. The current draw and power consumption specified is for 3.3 Vdc at 25C.
Typical value is measured when displaying mosaic(pixel checkerboard) screen.
2. Maximum power situation measured with alternating white-black line pattern.
LVDS common mode voltage, VCM=1.2V
3. The backlight power consumption shown above does not include loss of external inverter.
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V
DD
I
DD
-
V
IH
V
IL
V
BL
I
BL
F
BL
Min. Typ. Max.
3.0
-
-
-
-100
-
2.0
(50)
10,000
3.3
400
-
-
-
755
3.5
55
1200
(60)
3.6
640
60
100
-
-
5.0
Vdc
mA
mV
mV
mV
V
RMS
mA
V
RMS
KHz
Hours
25+-2C
@ I
1,2
2
2
3
BL=5mA
Revision Ver 1.0 05/ February /1998 Page5/19
LG Electronics, Inc.
Liquid Crystal Display
Product Specification
LP141X3
4. Optical Specifications
Optical characteristics are determined after the unit has been ‘ON’ and stable for approximately 30
minutes in a dark environment at 25C. The values specified are at an approximate distance 50cm from
the LCD surface at a viewing angle of Φ and θ equal to 0°.
Appendix A presents additional information concerning the specified characteristics.
Table 2 OPTICAL CHARACTERISTICS
Parameter Symbol
Contrast Ratio CR 120 150 - - 1
White Surface
Brightness
Brightness Variation SB
Response Time
Color Coordinates
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Viewing
Angle
(CR>10:1)
Notes 1. Contrast Ratio (CR) is defined mathematically as:
(Surface Brightness with all white pixels)
(Surface Brightness with all black pixels)
2. Surface brightness is 5 spot average of measurement across the LCD surface 50cm from the
3. The variation in surface brightness, SB
position 1 through 13, and then dividing the maximum B
Maximum (B
Minimum (B
4. Response time is the time required for the display to transition from white to black
(Rise Time, Tr
For additional information see Appendix A.
5. Viewing angle is the angle at which the contrast ratio is greater than 10. The angles are
6. Color Coordinates can be changed according to color filter. (In case of changing color filter,
we will tell our customer.)
Revision Ver 1.0 05/ February /1998 Page6/19
x axis, right (=0)
x axis, left(=180)
y axis, up(=90)
y axis, down (=270)
surface with all pixels displaying white. For more information see Appendix A.
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 Appendix A.
IBL=5.0mA
Rise Time Tr
Decay Time Tr
RED
GREEN
BLUE
WHITE
) and from black to white (Decay Time, TrD).
R
SB
WH
R
D
x 0.558 0.588 0.618 - 6
y 0.310 0.340 0.370 - 6
x 0.280 0.310 0.340 - 6
y 0.511 0.541 0.571 - 6
x 0.120 0.150 0.180 - 6
y 0.104 0.134 0.164 - 6
x 0.295 0.325 0.335 - 6
y 0.311 0.341 0.371 - 6
Min. Typ. Max.
120 130 - cd/m
V
is determined by measuring BON at each test
V
, B
ON1
, B
ON1
ON2
Values
- - 1.5 3
- 20 40 msec
- 30 50 msec
40 degree 5
40 degree 5
10 degree 5
30 degree 5
by the minimum BON.
ON
ON2
, ....B
, ....B
ON13
ON13
)
)
Units Notes
2
2
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