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BS EN 62595-1-1:2013

BS EN 62595-1-1:2013

$142.49

LCD backlight unit – Generic specification

Published By Publication Date Number of Pages
BSI 2013 26
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This part of IEC 62595 is a generic specification for backlight unit (BLU) for liquid crystal displays. It defines general procedures for quality assessment and gives general rules for the measuring methods of electrical and optical characteristics, rules for climatic and mechanical tests, and rules for endurance tests.

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PDF Pages PDF Title
6 English
CONTENTS
8 1 Scope
2 Normative references
9 3 Technical aspects
3.1 Order of precedence
3.2 Terminology, units and symbols
3.3 Preferred values of temperature, humidity and pressure
3.4 Marking
3.4.1 BLU identification
3.4.2 BLU traceability
3.4.3 Packing
10 3.5 Categories of assessed quality
3.6 Screening
3.7 Handling
4 Quality assessment procedures
4.1 General
4.2 Eligibility for qualification approval
Figures
Tables
11 4.3 Primary stage of manufacture
4.4 Commercially confidential information
4.5 Formation of inspection lots
4.6 Structurally similar devices
4.7 Granting of qualification approval
4.8 Quality conformance inspection
4.8.1 General
4.8.2 Division into groups and subgroups
13 4.8.3 Inspection requirements
14 4.8.4 Supplementary procedure for reduced inspection
4.8.5 Sampling requirements for small lots
4.8.6 Certified records of released lots (CRRL)
4.8.7 Delivery of devices subjected to destructive or non-destructive tests
15 4.8.8 Delayed deliveries
4.8.9 Supplementary procedure for deliveries
4.9 Statistical sampling procedures
4.9.1 General
4.9.2 AQL sampling plans
4.9.3 LTPD sampling plans
4.10 Endurance tests
4.11 Endurance tests where the failure rate is specified
4.11.1 Specification of failure rate
4.11.2 General
4.11.3 Selection of samples
4.11.4 Failure
16 4.11.5 Endurance test time and sample size
4.11.6 Procedure to be used if the number of observed failures exceed the acceptance number
4.12 Accelerated test procedures
4.13 Capability approval
17 5 Test and measurement procedures
5.1 Standard atmospheric conditions
5.2 Physical examination
5.2.1 Visual examination
5.2.2 Dimensions
5.2.3 Permanence of marking
5.3 Electrical and optical measurements
5.3.1 General conditions and precautions
18 5.3.2 Alternative methods
5.4 Environmental tests
19 Annex A (informative) Examples of BLU drawings
Figure A.1 – A front view of BLU
Figure A.2 – A rear view of BLU
20 Figure A.3 – A lateral view of BLU
Figure A.4 – Example of LED edge backlight unit
Figure A.5 – Example of LED direct backlight unit
21 Annex B (informative) Lot tolerance percentage defective (LTPD) sampling plans
22 Table B.1 – LTPD sampling plans (1 of 2)
24 Table B.2 – Hypergeometric sampling plans for small lot sizes of 200 or less

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BS EN 62595-1-1:2013
$142.49