IEC 61747-5:1998 pdf download – Liquid crystal and solid-state display devices -Part 5: Environmental, endurance and mechanical test methods

IEC 61747-5:1998 pdf download – Liquid crystal and solid-state display devices -Part 5: Environmental, endurance and mechanical test methods.
This part of IEC 61747 lists test methods applicable to liquid crystal display devices. It takes into account, wherever possible, the environmental test methods outlined in IEC 60068.
It also includes visual inspection for both liquid crystal display cells and modules.
NOTE 1 – This standard is ealabished sqparai.ly Iron’ IEC 60749, because the technoloQy of liquid crystal display devices a complelely delferent from that of ge,nIcoljctor devices ‘n such matted’s as
– shape and size.
— used materials and structure.
– funclion;
— measuring methods.
– operation principtes
NOTE — Devices Include cells aria lnoauleB
The obiect of this standard is to establish uniform preferred test methods with preferred values for stress levels for judging the environmental properties of liquid crystal display devices.
In case of contradiction between this standard and a relevant specification, the latter shall govern
1.2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61747. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61747 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 60068, Environmental testing
IEC 60068-1:1988, Environmental testing — Part 1: General and guidance
IEC 60068-2-1:1990, Environmental testing — Part 2: Tests — Test A: Cold
IEC 60068-2-2:1974, Environmental testing — Part 2: Tests — Test B: 0ry heat
IEC 60068-2-3:1969. Environmental testing — Part 2: Tests — Test Ca: Damp heat, steady slate
IEC 60068-2-5:1975, Environmental testing — Part 2: Tests — Test Sa: Simulated solar rad,ation at ground level
During measurements, the devices shall not be exposed to draught, illumination or other influences likely to cause error. The environment shall be controlled to avoid error.
If recovery and measurements are performed in separate chambers, the combination Of temperature and humidity conditions shall be such that condensation on the surface of the devices does not occur when the device is transferred to the measurement chamber.
1.4.4.2 Recovery procedure
The device shall be placed in the recovery chamber within tO mm of compteting of conditioning. Where the relevant specification requires measurements to be made immediately alter the recovery period, these measurements shall be completed within 30 mm of the specimen being removed from the recovery chamber. Those characteristics wtiich are expected to change most rapidly after the device Is removed from the recovery chamber shall be measured first.
1.4.5 Standard atmospheric conditions for assisted dryIng
Where assisted drying is required before commencing a series of measurements, the conditions listed below shall be used on the specimen f or 6 h, unless otherwise prescribed by the relevant specification.
Temperature: (55 ± 2) C
Relative humidify: not exceeding 20 %
Air pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar)
When the specified temperature for the dry heat test is lower than 55 °C. assisted drying shall be carried out at that lower temperature.
1.5 Visual examination and verification of dimensions
Clauses 5 and 6 are applicable
1.5.1 VIsual examination shall include
a) the conformance and permanence of the marking;
b) damage to the encapsulation, including terminals;
C) workmanship of the encapsulation, including terminals.
1.5.2 Dimensions given in the relevant specification shall be verified.
1.5.3 Unless otherwise specified, visual inspection shall be performed under normal factory lighting and under normal visual conditions.
1.6 Electrical and optical measurements
1.6.1 For environmental testing, the characteristics to be checked shall be selected from the relevant part of lEG 61747.
1.6.2 Measurement conditions shall comply with the table ‘Conditions for the endurance tests in the relevant pan of IEC 61747.