Doc.No.

Rev.No

Page

LTA104S1-L01

11

05-000-G-031217

(2) Lamp frequency may produce interference with horizontal synchronous frequency and this

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.

(4) Life time (Hr) of a lamp can be defined as the time in which it continues to operate under the

condition Ta = 25

1. When the brightness becomes 50% or lower than it’s original.

2. When the Effective ignition length becomes 80% or lower than it’s original value.

(Effective ignition length is defined as an area that has less than 70% brightness compared to

the brightness in the center point.)

(5) The voltage above this value should be applied to the lamp for more than 1 second to startup

Otherwise the lamp may not be turned on.

Note) The waveform of the inverter output voltage must be area symmetric and the design of the inverter

must have specifications for the modularized lamp.

The performance of the back-light, for example life time or brightness, is much influenced by the

characteristics of the DC-AC inverter for the lamp. So all the parameters of an inverter should be carefully

designed so as not to produce too much leakage current from high-voltage output of the inverter.

When you design or order the inverter, please make sure that a poor lighting caused by the mismatch of

the back-light 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.

3.2 BACKLIGHT UNIT

The back-light system is an edge - lighting type with a single CCFT ( Cold Cathode Fluorescent Tube ).

The characteristics of a single lamp are shown in the following tables.

Ta=25

± 2°C

Note (1) Lamp current is measured with a high frequency current meter as shown below.

LCD

MODULE

1

2

A

INVERTER

HOT : (PINK)

COLD : (WHITE)

ITEM

SYMB

MIN

TYP

MAX

UNIT

NOTE

Lamp Current

(1)

Startup Voltage

-

-

(5)

Operating Life Time

20,000

Hour

--

(4)

1000 (25

°C)

Lamp Voltage

Frequency

KHz

-W

Power Consumption

(2)

1300 (0

°C)

3.5

6.0

7.0

500

-

-

55

70

45

6.0

1

2

A

HOT : (PINK)

COLD : (WHITE)