LQ121S1LG42 Sharp Microelectronics, LQ121S1LG42 Datasheet - Page 9

• Manufacturer Part Number: LQ121S1LG42
• Description: TFT Displays & Accessories 12.1 TFT 800xRGBx600
• Manufacturer: Sharp Microelectronics

Specifications of LQ121S1LG42

• Diagonal: 12.1 in
• Maximum Operating Temperature: + 65 C
• Minimum Operating Temperature: - 10 C
• Operating Temperature Range: - 10 C to + 65 C
• Product: Displays
• Touch Panel: No Touch Panel
• Pixel Density: 800 x 600
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7-2. Backlight driving
[Note2] At the condition of IL=6.0mArms
[Note3] Lamp frequency may produce interference with horizontal synchronous frequency, and this may
[Note4] The voltage above this value should be applied to the lamp for more than 1 second to startup.
[Note5] Lamp is consumables. In the following condition, the life time is 50,000 hour as the reference value
[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 10 lx or less, lamp may not turn on or it may take some time to turn on.
Lamp current range
Lamp power consumption
Lamp frequency
Kick-off voltage
[Note1] Lamp current is measured with current meter for high frequency as shown below.
The data don ’ t include loss at inverter. ( IL=6.0mArms)
cause 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.
Otherwise the lamp may not be turned on.
and it is not guaranteed in this technical literature sheet by SHARP.
Above value is applicable when lamp is placed horizontally.
Lamp life time is defined that it applied either ① or ② under this condition
lamps and the capacity deviation of barast capacitor.
(Lamp life time may vary if lamp is in portrait position due to the change of mercury density inside
the lamp.) Lamp life time shortens according to the state of mounting and use.
condition may reduce the brightness to half of the original brightness.)
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-P1212B-WJL(TDK corporation) ” .
The backlight system is an edge-lighting type with 2 CCFT (Cold Cathode Fluorescent Tube).
The characteristics of single lamp are shown in the following table.
In case of operating under lower temp environment, the lamp exhaustion is accelerated and the
brightness becomes lower. (Continuous operating under for around 1 month under lower temp
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.
Parameter
Module
(Continuous turning on at Ta=25
① Brightness becomes 50% of the original value under standard condition.
② Kick-off voltage at Ta=-10
Symbol
１
１
* 3pin is V
3
3
PL
FL
Vs
IL
Min.
Ａ
∼
Ａ
∼
3.0
o
40
C exceeds maximum value,1500Vrms.
-
-
-
-
o
C, IL=6.0mArms)
LOW
Typ.
6.0
3.5
60
-
-
-
Max.
1200
1400
1500
6.5
80
-
Inverter
mArms
Vrms
kHz
Unit
W
[Note1]
[Note2]
[Note3]
Ta=25
Ta=0
Ta=-10
o
C
o
Remark
o
C
C
[Note4]