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LTM220MT05 Datasheet(PDF) 15 Page - Samsung semiconductor

Part No. LTM220MT05
Description  color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT (Thin Film Transistor) as switching components
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Maker  SAMSUNG [Samsung semiconductor]
Homepage  http://www.samsung.com/Products/Semiconductor
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LTM220MT05
MODEL
PRODUCT INFORMATION
PRODUCT INFORMATION
(2) Lamp frequency which may produce interference with horizontal synchronous
frequency may cause line flow on the display. Therefore lamp frequency should be
detached from the horizontal synchronous frequency and its harmonics as far as
possible in order to avoid interference.
(3) Life time (Hr) is defined as the time when brightness of a lamp unit itself becomes
50% or less than its original value at the condition of Ta = 25 2 C and I
L = 7.5mArms
(4) Designing a system inverter intended to have better display performance, power
efficiency and lamp reliability.
They would help increase the lamp lifetime and reduce leakage current.
a. The measurement should be done at typical lamp current.
b. The asymmetry rate of the inverter waveform should be less than 10%.
c. The distortion rate of the waveform should be 2 with
10% tolerance.
-Inverter output waveform had better be more similar to ideal sine wave.
||
II
Irms
p- p
−
Ă— 100
! Asymmetry rate
! Distortion rate
(5) If an inverter has shutdown function, it should keep its output for over 1 second
even if the lamp connector is open. Otherwise the lamps may not be turned on.
Fig. Wave form of the inverter
||
I
Irms
p
||
I
Irms
-p
or
I
p
I
-p




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