LQ121S1DG41 Sharp Electronics, LQ121S1DG41 Datasheet - Page 10

• Manufacturer Part Number: LQ121S1DG41
• Manufacturer: Sharp Electronics

Specifications of LQ121S1DG41

• Lead Free Status / Rohs Status: Compliant

7-2. Backlight driving
[Note1] Lamp current is measured with current meter for high frequency as shown below.
[Note2] At the condition of IL=6.0mArms.
[Note3] Lamp frequency may produce interference with horizontal synchronous frequency,and
[Note4] The open output voltage of the inverter shall be maintained for more than 1s; otherwise
[Note5] Since lamp is consumables, the life time written above is referential value and it is not
[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
The backlight system is an edge-lighting type with double CCFT (Cold Cathode Fluorescent Tube).
The characteristics of single lamp are shown in the following table.
(It is usually required to measure under the following condition.
Parameter
Lamp current
Lamp power consumption
Lamp frequency
Kick-off voltage
Lamp life time
condition:IL=6.0mA,Ta=25℃±2℃,FL=60kHz.)
this may cause beat on the display. Therefore lamp frequen cy sh all be detached as
much as possible from the horizontal synchronous frequency and from the harmonics
of horizontal synchronous to avoid interference.
In case of operating under lower temp environment, the lamp exhaustion is accelerated
Recommended inverter is “CXA-P1212B-WJL(TDK corporation)”.
the lamp may not be turned on.
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
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.
guaranteed in this specification sheet by SHARP.
Lamp life time is defined that it applied either ① or ② under this condition
(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.)
of the two CCFT lamps and the capacity deviation of barast capacitor.
Module
Symbol
１
１
* 3pin is V
3
3
PL
FL
Vs
LL
IL
o
C exceeds maximum value, 1500Vrms.
o
C, IL=6.0mA rms)
Ａ
∼
50000
Ａ
∼
3.0
35
-
-
-
-
LOW
Typ.
3.5
6.0
60
-
-
-
-
Max.
1200
1400
1500
Inverter
6.5
80
-
-
mA rms
V rms
V rms
V rms
Hour
Unit
kHz
W
you design or order the
Remark
[Note2]
[Note3]
Ta=25
Ta=0
Ta=-10
[Note5]
[Note1]
o
C [Note4]
o
o
C
C
LD15604D-7