LP121X04 Datasheet

LCD

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Product Specification
LP121X04
Liquid Crystal Display
1. General Description
The LP121X04(B2) 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. This TFT-LCD has 12.1 inches
diagonally measured active display area with XGA resolution(768 vertical by 1024 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 6-bit gray scale signal for each dot,
thus, presenting a palette of more than 262,144 colors.
The LP121X04(B2) has been designed to apply the interface method that enables low power, high speed,
low EMI. Flat Link must be used as a LVDS(Low Voltage Differential Signaling) chip.
The LP121X04(B2) is intended to support applications where thin thickness, low power are critical factors
and graphic display are important. In combination with the vertical arrangement of the sub-pixels, the
LP121X04(B2) characteristics provide an excellent flat display for office automation products such as
Notebook PC.
Timing
Control
Block
Power
Block
Column driver circuit
TFT-LCD
(1024×768)
CN2
Backlight Ass’y
General Features
Active screen size
Outline Dimension
Pixel Pitch
Pixel format
Color depth
Luminance, white
Power Consumption
Weight
Display operating mode
Surface treatments
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12.1 inches(30.73cm) diagonal
261(H) x 199(V) x 5.0(D) mm(Typ.)
0.240 mm x 0.240mm
1024 horiz. By 768 vert. Pixels RGB stripes arrangement
6-bit, 262,144 colors
150 cd/m2(Typ.) , center 1point @ 5.5
Total 4.5 Watt(Typ.)
300g(Typ.)
Transmissive mode, normally white
Hard coating(3H)
Anti-glare treatment of the both(front,back) polarizer, HAZE(44%,12%)
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Product Specification
LP121X04
Liquid Crystal Display
2. Electrical Specifications
The LP121X04(B2) requires two power inputs. One is employed to power the LCD electronics and to
drive the TFT array and liquid crystal. The second input which powers the CCFL, is typically generated
by an inverter. The inverter is an external unit to the LCD.
Table 1. ELECTRICAL CHARACTERISTICS
Parameter
MODULE :
Power Supply Input Voltage
Power Supply Input Current
Differential Impedance
Power Consumption
Rush Current
LAMP :
Operating Voltage
Operating Current
Established Starting Voltage
at 25 ¶C
at 0 ¶C
Operating Frequency
Discharge Stabilization Time
Power Consumption
Life Time
Values
Symbol
Min. Typ.
VCC
ICC
Zm
PC
IRUSH
3.0 3.3
- 0.263
90 100
- 0.87
1.0
VBL
IBL
- 580
3.0 5.5
VS - -
--
f BL 50 65
TS
PBL
-
10,000
3.2
-
Max.
3.6
0.302
110
1.00
1.8
640
6.0
1010
1210
80
3
3.52
-
Units
Vdc
A
ohm
Watts
A
VRMS
mA
VRMS
VRMS
kHz
Minutes
Watts
Hrs
Notes
1
2
1
3
4
5
4
5
6
7
Note : The design of the inverter must have specification for the lamp in LCD Assembly.
The performance of the Lamp in LCM, for example life time or brightness, 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 you instrument.
1. The specified current and power consumption are under the VCC=3.3V, 25¶C,fV=60Hz condition
whereas full black pattern is displayed and fV is the frame frequency.
2. This impedance value is needed to proper display and measured from LVDS TX to the mating connector.
3. The duration of rush current is about 20ms.
4. The variance of the voltage is ± 10%.
5. The voltage above VS should be applied to the lamps for more than 1 second for start-up.
Otherwise, the lamps may not be turned on.
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Product Specification
LP121X04
Liquid Crystal Display
6. The output of the inverter must have symmetrical(negative and positive) voltage waveform and
symmetrical current waveform.(Asymmetrical ratio is less than 10%) Please do not use the inverter
which has asymmetrical voltage and asymmetrical current and spike wave.
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.
7. It is defined the brightness of the lamp after being lighted for 5 minutes as 100%.
TS is the time required for the brightness of the center of the lamp to be not less than 95%.
8. The lamp power consumption shown above does not include loss of external inverter.
The used lamp current is the lamp typical current.
9. The life is determined as the time at which brightness of the lamp is 50% compared to that of initial
value at the typical lamp current on condition of continuous operating at 25 ± 2¶C.
10. 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.
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