BS IEC 62595-2-3:2018

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Display lighting unit – Electro-optical measuring methods for LED frontlight unit

Published By	Publication Date	Number of Pages
BSI	2018	34

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Description

This part of IEC 62595 specifies the standard measurement conditions and measuring methods for determining electrical, optical, and electro-optical properties of LED frontlight units (FLUs) for reflective displays.

NOTE: See 3.1.1 for a definition of reflective display.

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PDF Pages	PDF Title
2	undefined
4	CONTENTS
6	FOREWORD
8	1 Scope 2 Normative references 3 Terms, definitions, abbreviated terms and letter symbols 3.1 Terms and definitions
10	3.2 Abbreviated terms
11	3.3 Letter symbols (quantity symbols / unit symbols) Table 1 – Letter symbols (quantity symbols / unit symbols)
12	4 Measuring devices 4.1 General 4.2 Light measuring device (LMD) 4.2.1 Luminance meter 4.2.2 Spectroradiometer (spectral radiance-meter) 4.2.3 Conoscopic system 4.2.4 Image sensor 4.3 Other devices 4.3.1 Sample stage
13	4.3.2 Light absorber 5 General measuring conditions 5.1 Standard conditions 5.2 Measurement setup Figures Figure 1 – Example of light absorber (optical trap)
14	5.3 Warm-up time 6 Electrical measurement methods 6.1 Conditions 6.2 Current 6.3 Voltage 6.4 Power consumption Figure 2 – Example of measurement setup for a LED FLU
15	7 Optical measurement methods 7.1 General 7.2 Dark room conditions 7.2.1 General 7.2.2 Measurement items under the external lighting condition 7.2.3 Measurement items under the internal lighting condition 7.3 Conditions
16	7.4 Luminance 7.4.1 General 7.4.2 Procedures Figure 3 – Illustration of zenith angle θ and azimuth angle ϕ (normal-state FLU)
17	7.5 Angular luminance distribution (ALD) 7.6 Luminance uniformity or non-uniformity Figure 4 – Polar coordinate system for frontlight unit measurement
18	7.7 Spectral power distribution 7.8 Chromaticity 7.9 Colour uniformity 7.10 Angular luminance uniformity 7.11 Angular colour uniformity 7.12 FLU polarization characteristic measurement
19	7.13 Normal- or inverted-state FLU characteristics 7.14 Optical noise measuring 7.15 Cosmetic quality or perceptual visual quality Figure 5 – Example of light polarizing characteristics of an FLU in inverted state
21	Annex A (informative) Optical structure of an FLU Figure A.1 – Direct edge-lit FLU and indirect edge-lit FLU
22	Annex B (informative) Normal-state FLU and inverted-state FLU Figure B.1 – Normal-state FLU Figure B.2 – Inverted-state FLU
23	Annex C (informative) Angular measurement system Figure C.1 –Standard goniometric system Figure C.2 – Conoscopic system
24	Annex D (informative) Measurement parameters for BRDF and BTDF D.1 BRDF D.2 BTDF Figure D.1 – System for measuring the BRDF Figure D.2 – Measuring the BRDF of an LGP for an FLU
25	Figure D.3 – System for measuring the BTDF
26	Annex E (informative) Determining the polarization state of reflected light on the front surface of an FLU or transmitted light through the FLU Figure E.1 – Geometry of a reflected or transmitted polarized light
27	Annex F (informative) Optical transfer function (OTF) of an FLU F.1 Optical transfer function evaluation chart F.2 Example of optical transfer function Figure F.1 – Printed charts on photographic paper for measuring the OTF of the FLU
28	Figure F.2 – Example of OTF
29	Annex G (informative) Sources of optical noise in a normal-state FLU with a reflective display Figure G.1 – Light rays of an FLU with a reflective LC display Figure G.2 – Sources of noises in a normal-state FLU with a reflective display
30	Annex H (informative) Formulation of contrast ratio for a reflective display with an integrated FLU H.1 Contrast ratio for a reflective display without FLU integration H.2 Contrast ratio for a reflective display with FLU integration
31	Annex I (informative) Example of optical noise of an FLU Figure I.1 – Optical signal and noise in a normal-state FLU
32	Bibliography

Additional information

Status	Definitive
Pages	34
Publication Date	2018-02-28
ISBN	978 0 580 95538 9
Standard Number	BS IEC 62595-2-3:2018
Title	Display lighting unit – Electro-optical measuring methods for LED frontlight unit
Identical National Standard Of	IEC 62595-2-3:2018
Descriptors	Measurement, LED, Optical measurement, Lighting, Display devices
Publisher	BSI
Committee	EPL/100
ICS Codes	31.260 - Optoelectronics. Laser equipment

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BS IEC 62595-2-3:2018

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