LQ104V1DG21 Sharp Electronics, LQ104V1DG21 Datasheet - Page 10

• Manufacturer Part Number: LQ104V1DG21
• Manufacturer: Sharp Electronics

Specifications of LQ104V1DG21

• Lead Free Status / Rohs Status: Compliant

6-2. Backlight driving
Ta=25℃
Lamp life time
[Note1] Lamp current is measured with current meter for high frequency as shown below.
[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
[Note4] The open output voltage of the inverter shall be maintained for more than 1s; otherwise
[Note5] Above value is applicable when lamp (the long side of LCD module) is placed horizontally.
[Note6] The performance of the backlight, for example life time or brightness, is much influenced
[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 delay may occur.
Lamp current
Lamp power consumption
Lamp frequency
Kick-off voltage
Module
The data don’t include loss at inverter. ( IL=6.0mArms)
the lamp may not be turned on.
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
In case of operating under lower temp environment, the lamp exhaustion is accelerated
lamps and the capacity deviation of barast capacitor.
beat 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.
(Landscape position)
The backlight system is an edge-lighting type with double CCFT (Cold Cathode
lamp.)
and the brightness becomes lower.
(Continuous operating for around 1 month under lower temp condition may reduce the
In case of such usage under lower temp environment, periodical lamp exchange is recommended.
by the 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.
Fluorescent Tube). The characteristics of single lamp are shown in the following table.
Parameter
(Continuous turning on at Ta=25
① Brightness becomes 50% of the original value under standard condition.
② Kick-off voltage at Ta=-10
brightness to half of the original brightness.)
CN2：1pin
CN2：3pin
Symbol
Vs
L
P
F
I
L
L
L
L
Ａ
∼
o
50000
Min.
C exceeds maximum value,1500Vrms.
2.0
−
20
−
−
−
o
C, IL=6.0mA rms)
Ｖ
∼
Typ.
6.0
2.8
35
−
−
−
−
Inverter
output voltage
Max.
1250
1500
950
6.5
−
60
−
mArms 【Note1】
Vrms Ta=25℃【Note4】
Vrms Ta =0℃【Note4】
Vrms Ta =-10℃【Note4】
KHz 【Note3】
hour 【Note5】
Unit
Ｗ
【Note2】
Ｖ
∼
Transformer
output voltage
Inverter
Remark
LD14901B-6