ENH064V1-300/450

Original specifications created by Sharp.

5

Display Systems Division • Hillsboro, OR • (503) 690-2460 • www.wedc.com

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

August 2003

Rev. 0

White Electronic Designs

Display Systems Division

BACKLIGHT DRIVING SECTION

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

The characteristics of a single lamp are shown in the folliowing table..

Parameter

Symbol

MIN

TYP

MAX

Unit

Remark

Lamp current

2.0

6.0

6.5

mArms

(1)

Lamp power consumption

-

2.16

-

W

(2)

Lamp frequency

20

35

60

KHz

(3)

Kickoff voltage

-

-

800

Vrms

-

-

1000

Vrms

Lamp life time

-

25000

-

hour

(5)

2.

3.

Lamp frequency may produce interference with horizontal synchronous frequency,and this may cause horizontal 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.

4.

The open output voltage of the inverter shall be maintained for more than 1 sec; otherwise the lamp may not be turned on.

5.

Since lamp is consumables, the life time written above is referential value and it is not guaranteed in this specification sheet by WEDC. Lamp life time is defined that it applied

1.

Brightness becomes 50% of the original value under standard condition.

2.

becomes lower.

(Continuous operating for around 1 month under lower temp condition may reduce the brightness to half of the original brightness.)

In case of such usage under lower temp environment, periodical lamp exchange is recommended

Note:

1.

The performance of the backlight, for example life time; or brightness, is infuenced by the characteristics of the DC-AC inverter for the lamp. When designing or ordering the

inverter, make sure that poor lighting caused by the mismatch of the backlight and the inverter (mis-lighting,flicker, etc.) do not occur. Once this is confirmed, the module should

be operated in the same condition as it is installed in the instrument.

Notes:

1.

Lamp current is measured with current meter for high frequency as shown below.

Inverter

Module

1

3

A

~