LQ121S1DG61 Sharp Microelectronics, LQ121S1DG61 Datasheet - Page 10

• Manufacturer Part Number: LQ121S1DG61
• Description: TFT Displays & Accessories 12.1 SVGA STRONG 2 LVDS
• Manufacturer: Sharp Microelectronics

Specifications of LQ121S1DG61

• Diagonal: 12.1 in
• Viewing Area (w X H): 247 mmx 184.5 mm
• Pixel Density: 800 x 600
• Module Size (w X H X T): 276 mm x 209 mm x 11 mm
• Backlighting: White
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7-2. Backlight driving
[Note2] Referential data per one CCFT by calculation. (I L × VL)
[Note3] Lamp frequency may produce interference with horizontal synchronous frequency, and this may cause beat
[Note4] The voltage above this value should be applied to the lamp for more than 1 second to start-up. Otherwise the
[Note5] Since lamp is consumables, the life time written above is referencial value and it is not guaranteed in this
[Note6] The performance of the backlight, for example life time or brightness, is much influenced by the
[Note7] It is required to have the inverter designed so that to allow the impedance deviation of the two CCFT
[Note8] Under the environment of 10lx or less, miss-lighting or lighting delay may occur.
Lamp current range
Lamp power consumption
Lamp frequency
Kick-off voltage
Lamp life time
[Note1] Lamp current is measured with current meter for high frequency as shown below.
Module
The data don’t include loss at inverter. ( IL=6.0mArms)
on the display. Therefore lamp frequency shall be detached as much as possible from the
horizontal synchronous frequency and from the harmonics of horizontal synchronous to avoid interference.
lamp may not be turned on.
specification sheet by SHARP.
Above value is applicable when lamp (the long side of LCD module) is placed horizontally.
(Landscape position)
Lamp life time is defined that it applied either ① or ② under this condition
(Lamp lifetime may vary if lamp is in portrait position due to the change of mercury density inside the lamp.)
In case of operating under lower temp environment, the lamp exhaustion is accelerated and the brightness
becomes lower. (Continuous operating for around 1 month under lower temp condition may reduce the
brightness to half of the original brightness.)
In case of such usage under lower temp environment, periodical lamp exchange is recommended.
characteristics of the DC-AC inverter for the lamp. When you design or order the inverter, please
make sure that a poor lighting caused by the mismatch of the backlight and the inverter
(miss-lighting, flicker, etc.) never occur. When you confirm it, the module should be operated in the
same condition as it is installed in your instrument.
Be sure to use a back light power supply with the safety protection circuit such as the detection circuit
for the excess voltage, excess current and or electric discharge waveform.
Be sure to use the detect circuit by which one side of the CCFT lamps can be controlled independently.
Otherwise, when one side of the CCFT is open, the excess current may possibly be applied to the other side of
the lamp. Recommended inverter is “CXA-0454(TDK)”.
(“CXA-P1212B-WJL(TDK)” is also recommended under general temperature condition.)
lamps and the capacity deviation of barast capacitor.
Parameter
The backlight system is an edge-lighting type with two CCFT (Cold Cathode Fluorescent Tube).
The characteristics of single lamp are shown in the following table.
(Continuous turning on at Ta=25
① Brightness becomes 50% of the original value under standard condition.
② Kick-off voltage at Ta=-30
CN2,3：1pin
CN2,3：2pin
Symbol
PL
LL
FL
Vs
IL
50000
60000
Ａ
∼
Min.
3.0
40
-
-
-
o
C exceeds maximum value,1300Vrms.
o
C, IL=6.0mArms)
Typ.
6.0
3.5
60
Ｖ
∼
-
-
-
-
Inverter
output voltage
(2000)
Max.
1300
6.5
70
-
-
-
mArms [Note1]
Vrms
Vrms
hour
hour
kHz
Unit
W
at barast capacitor =12pF
[Note2]
[Note3]
IL=6.0 mArms
IL=5.0 mArms
Ｖ
∼
Transformer output
Inverter output
Transformer
output voltage
Inverter
Remark
[Note5]
[Note5]
LD18121A-7
[Note4]
Ta=
-30
o
C