Specification No. TENTATIVE
Sheet
31
Toshiba Matsushita Display Technology Co.,Ltd
Date: 2008 – 11- 07
Date: - -
New No. LTA057A341F-14
Old No.
←
# Special
←&
Addition
←
Change
7. Lifetime
7.1 Module (except LED)
MTTF (Mean Time To Failure): 50,000 h
(This value is not assurance time but inference value by following conditions.)
Conditions : Ambient temperature : 25
±
5
°
C (No wind)
Ambient humidity : 65%(RH)
7.2 LED
7.2.1 Test Conditions
Ambient temperature : 25
±
5
°
C (No wind)
LED current : 15mA
Lighting condition : continuous lighting
7.2.2 Specifications
MTBF : 20,000 h (
I
LED
=15mA)
Definitions of failure for judgment shall be as follows.
1) LCD luminance becomes half of the minimum value specified in 5.2.
2) LED doesn't light normally.
Note1) In case of LCD long period operation, discoloration of light guide or optical sheet.
As the result, there is possibility to have out of specification for the optical characteristics
as “5.2”. But this is not irregular phenomena.
Moreover, LED also has the characteristic of color shift by long period operation.