1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLCD backlight unitPart 1-2: Terminology and letter symbolsBS EN 62595-1-2:2012National forewordThis British Standard is the UK implementation of EN 62595-1-2:2012. It isidentical
2、 to IEC 62595-1-2:2011.The UK participation in its preparation was entrusted to Technical CommitteeEPL/47, Semiconductors.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acon
3、tract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 70195 5ICS 31.120; 31.260 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under th
4、e authority of the StandardsPolicy and Strategy Committee on 31 March 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 62595-1-2:2012EUROPEAN STANDARD EN 62595-1-2 NORME EUROPENNE EUROPISCHE NORM March 2012 CENELEC European Committee for Electrotechnical Stand
5、ardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62595-1-2:2012
6、 E ICS 31.120; 31.260 English version LCD backlight unit - Part 1-2: Terminology and letter symbols (IEC 62595-1-2:2011) Ecran LCD rtro-clairage - Partie 1-2 : Terminologie et symboles littraux (CEI 62595-1-2:2011) LCD-Hinterluchtungseinheitn -Teil 1-2: Begriffsbestimmungen und Kurzzeichen (IEC 6259
7、5-1-2:2011) This European Standard was approved by CENELEC on 2012-01-18. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibl
8、iographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the re
9、sponsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Fi
10、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 62595-1-2:2012EN 62595-1-2:2012 - 2 - Foreword The text of
11、document 110/275/CDV, future edition 1 of IEC 62595-1-2, prepared by IEC TC 110, “Flat panel display devices“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62595-1-2:2012. The following dates are fixed: latest date by which the document has to be implemented at nationa
12、l level by publication of an identical national standard or by endorsement (dop) 2012-10-18 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-01-18 Attention is drawn to the possibility that some of the elements of this document may be the subj
13、ect of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 62595-1-2:2011 was approved by CENELEC as a European Standard without any modification. BS EN 62595-1-2:2012- 3 - EN 625
14、95-1-2:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the editi
15、on cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050 Se
16、ries International electrotechnical vocabulary - - BS EN 62595-1-2:2012 2 62595-1-2 IEC:2011 CONTENTS 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 3.1 Classification of terms . 5 3.2 Fundamental terms 5 3.3 Terms related to passive optical components 9 3.4 Terms related to ligh
17、t sources . 12 3.4.1 Light Emitting Diode (LED) 12 3.4.2 LED light bar . 13 3.5 Terms related to light source drivers . 13 3.6 Terms related to frontlight unit . 14 3.7 Terms related to performances and specifications . 15 3.8 Terms related to backlight dimming . 17 4 Letter symbols (quantity symbol
18、s / unit symbols) 18 Annex A (informative) Supplementary figures 19 Figure A.1 Backlighting concept for transmissive and transflective LCD . 19 Figure A.2 Examples of edge-lit backlight units 19 Figure A.3 Example of direct-lit backlight units. 20 Figure A.4 Examples of spectral power distributions
19、(pseudo-white and RGB LEDs) 20 Figure A.5 Polar coordinates for evaluation of the luminance angular distribution 20 Figure A.6 Luminance uniformity on a backlight unit 21 Figure A.7 Incoherent point spread function for evaluation of a segment in a block-wise dynamic backlight unit. White and black s
20、egments show the on and off conditions, applied to all segments . 21 Figure A.8 Incoherent point spread function of a block in a block-wise backlight unit, with different distributions . 22 Figure A.9 Angular luminance variation on a backlight unit 23 Figure A.10 Checkerboard pattern for evaluation
21、of the uniformity between the incoherent point spreading functions of the segments of dynamic backlight unit 23 BS EN 62595-1-2:201262595-1-2 IEC:2011 5 LCD BACKLIGHT UNIT Part 1-2: Terminology and letter symbols 1 Scope This part of IEC 62595 gives preferred terms, their definitions and symbols for
22、 backlight unit (BLU) and related display panel lighting systems including frontlight; with the object of using the same terminology when publications are prepared in different countries. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document
23、 and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at ) 3 Terms and def
24、initions For the purposes of this document, the terms and definitions given in IEC 60050-845:19871and the following apply. 3.1 Classification of terms Terms for backlight units (BLUs) are classified as follows: a) fundamental terms; b) terms related to passive optical components; c) terms related to
25、 light sources ; d) terms related to light source drivers; e) terms related to frontlight unit; f) terms related to performances and specifications ; g) terms related to backlight dimming. The following definitions are applied for international standardization of the backlight units. 3.2 Fundamental
26、 terms 3.2.1 backlight unit BLU illumination unit (arbitrary shape) with unique optical characteristics that is set at the rear of a transmissive or transflective display panel for the purpose of image recognition on the panel Note 1 to entry: For an example, see Figure A.1. 1Identical to CIE 17.4.
27、BS EN 62595-1-2:2012 6 62595-1-2 IEC:2011 3.2.2 edge-lit backlight unit side-lit backlight unit edge-light backlight unit side-light backlight unit backlight unit in which an optically transparent media (light-guide plate) is used in proximity with the light source for introducing the light from the
28、 side surface of the media Note 1 to entry: For an example, see Figure A.2. 3.2.3 direct-lit backlight unit direct-view backlight unit backlight unit in which a light chamber is used in combination with light sources that are mounted inside the chamber to illuminate a transmissive LCD panel mounted
29、on the chamber for modulating spatially the displayed two-dimensional information on the panel for the purpose of image recognition Note 1 to entry: For an example, see Figure A.3. 3.2.4 side-driven direct-lit backlight unit backlight unit in which a light chamber is used in combination with light s
30、ources that are mounted on the inner sides of the chamber to illuminate a panel mounted on the chamber for modulating spatially the displayed two-dimensional information on the panel for the purpose of image recognition 3.2.5 static backlight unit single or integrated flat illumination system that o
31、perates with direct or alternative current and possesses a unique optical characteristic 3.2.6 dynamic backlight unit single or integrated illumination units that possess a unique electro-optical and spatial characteristics which change with the local picture contents of the display panel 3.2.7 blin
32、king backlight unit backlight unit that is intentionally, usually regularly or periodically, switched on and off for synchronically illuminating a display panel 3.2.8 scanning backlight unit backlight unit that is divided spatially into few line blocks and regularly or periodically switched on and o
33、ff block by block for synchronous illumination of the display panel 3.2.9 spatio-temporal backlight unit backlight unit that is divided spatially into few horizontal blocks and regularly or periodically switched on and off from top to bottom under a time chart for illuminating or flashing red, green
34、, or blue light in synchronization with a field-sequential colour display 3.2.10 field alternative backlight unit backlight unit that includes a single light-guide plate (LGP) with distinctive upper and lower light sources or a plate that is spatially divided into two upper and lower plates for coop
35、eration with a display panel for illuminating or flashing alternatively the panel with respect to displayed half image by the upper or lower part of the panel BS EN 62595-1-2:201262595-1-2 IEC:2011 7 3.2.11 single-side emission backlight unit backlight unit that emits light from a single side (front
36、 or rear) for illuminating a single display panel 3.2.12 double-side emission backlight unit backlight unit that emits light from both front and rear for illuminating two display panels 3.2.13 segmented backlight unit backlight unit that is block-wised or segmented two-dimensionally to be synchroniz
37、ed with a display panel for illuminating individually each block or segment of the display 3.2.14 quasi-monochromatic backlight unit backlight unit that uses only quasi-monochromatic light source for illuminating transmissive passive display panel 3.2.15 multi-colour backlight unit backlight unit th
38、at consists of few primaries or quasi-monochromatic light sources for illuminating a display that is used for wide colour gamut display of printer, professional design monitor or field alternative wide colour gamut display panel 3.2.16 mobility enhanced backlight unit backlight unit that employs lig
39、ht materials and few optical components for the sake of enhancing lightness for mobility 3.2.17 corner driven backlight unit edge-lit backlight unit in which the light is driven from the corner of a rectangular light-guide plate using single or few light sources 3.2.18 stack backlight unit backlight
40、 unit in which more than a single light control media or light-guide plate is used in stack form in the structure for light controlling 3.2.19 colour reproduction backlight unit backlight unit that uses primaries for the sake of colour production on a display panel 3.2.20 RG-white backlight unit bac
41、klight unit that uses RG-white LEDs as light sources 3.2.21 RGW backlight unit backlight unit that uses distinct red, green and pseudo-white LEDs as light sources 3.2.22 three primaries (R,G,B) backlight unit backlight unit that uses three primary colours of red, green, and blue quasi-monochromatic
42、LEDs as light sources BS EN 62595-1-2:2012 8 62595-1-2 IEC:2011 3.2.23 six primaries (R1,G1,B1,R2,G2,B2) backlight unit backlight unit employing two groups of red, green and blue light sources for illuminating a display panel which is used for reproduction of colours of photographs 3.2.24 single-fla
43、sh backlight unit backlight unit that flashes periodically and is synchronized with the display panel for the purpose of inserting black or grey frame in order to enhance the moving image quality on the display 3.2.25 multi-flash backlight unit spatially and linearly segmented backlight unit for sca
44、nning or field-sequential colour display that flashes periodically and is synchronized with the display for the purpose of inserting colour fields, black or grey fields in order to enhance the image quality on the display or spatially mix the colours for displaying coloured images 3.2.26 multi-prima
45、ry colours backlight unit backlight unit that employs multiple LED or laser light sources which have different peak wavelengths 3.2.27 tandem backlight unit backlight unit that is an integration of multiple distinct and overlapped edge-lit backlight units 3.2.28 spectral power distribution power per
46、 unit area per unit wavelength of a backlight unit, or a bound of light spectral distribution with a power per wavelength, S(), that emerges from a unit area on the backlight and is measured using a spectrometer or an optical spectrum analyser Note 1 to entry: For an example, see Figure A.4. 3.2.29
47、chromaticity chromaticity coordinates (see IEC 60050-845:1987, 845-03-33) based on CIE 1931 standard colorimetric system (see IEC 60050-845:1987, 845-03-28), x, y, z on a backlight unit are obtained using the tristimulus values, X, Y, Z that is the result of measurement of spectral power distributio
48、n, S() (see 3.2.28) Note 1 to entry: where Kmis given as Km = 683 lm/W; is in the range of 360 nm to 830 nm (definition), or 380 nm to 780 nm (actually); , are the colour-matching functions BS EN 62595-1-2:201262595-1-2 IEC:2011 9 3.3 Terms related to passive optical components 3.3.1 light-guide pla
49、te LGP transparent media that is used generally in an edge-lit backlight unit for forming the required light distribution spatially for transmissive or transflective display panels 3.3.2 functional light-guide plate transparent media characterized with optical micro or nano-structures for shaping spatially or angularly the required light for a transmissive or transflective display panel 3.3.3 slab light-guide plate light-guide plate that has a slab geometrical shape 3.3.4 wedge light
