1、 IEC 61747-30-4 Edition 1.0 2016-08 INTERNATIONAL STANDARD Liquid crystal display devices Part 30-4: Measuring methods for liquid crystal display modules Dynamic backlight units IEC 61747-30-4:2016-08(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland A
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11、quid crystal display modules Dynamic backlight units INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 31.120 ISBN 978-2-8322-3608-6 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2
12、 IEC 61747-30-4:2016 IEC 2016 CONTENTS FOREWORD . 4 1 Scope 6 2 Normative references. 6 3 Terms, definitionsand abbreviations . 6 3.1 Terms and definitions 6 3.2 Abbreviations 6 4 Standard measuring equipment 7 5 Measuring conditions . 7 5.1 Standard measuring environmental conditions . 7 5.2 Power
13、supply 7 5.3 Warm-up time . 7 5.4 Standard measuring dark-room conditions . 8 5.5 Standard set-up conditions 8 5.6 Signal patterns 8 5.6.1 Full screen pattern . 8 5.6.2 Checkerboard patterns . 9 5.6.3 Increasing window patterns 9 5.6.4 Line patterns 10 5.6.5 Moving image 10 5.6.6 Video signal . 11 6
14、 Measuring methods . 11 6.1 Optical performance 11 6.1.1 Luminance and uniformity 11 6.1.2 Chromaticity and uniformity 12 6.1.3 Window size dependence of luminance and chromaticity . 14 6.1.4 Contrast ratio . 15 6.1.5 Flicker . 16 6.1.6 Judder . 19 6.2 Power consumption . 21 6.2.1 Static power consu
15、mption 21 6.2.2 Dynamic power consumption 22 Annex A (informative) Example of flicker measurement . 23 Bibliography . 26 Figure 1 DUT set-up conditions 8 Figure 2 Full screen pattern . 9 Figure 3 Checkerboard patterns . 9 Figure 4 Increasing window patterns 10 Figure 5 Line patterns 10 Figure 6 Movi
16、ng image . 11 Figure 7 Example of input signal level dependence on chromaticity . 13 Figure 8 Window size dependence on luminance and chromaticity 15 Figure 9 Apparatus arrangement 17 Figure 10 Temporal contrast sensitivity function . 18 Figure 11 Example of the luminance waveform by weighting TCSF
17、. 19 IEC 61747-30-4:2016 IEC 2016 3 Figure 12 Dynamic curve of the judder . 21 Figure A.1 Luminance as a function of time L(t) 23 Figure A.2 Power spectrum with Fourier Transform . 23 Figure A.3 Perceptive power spectrum of example flicker 24 Figure A.4 Luminance of example screen flicker by weighti
18、ng TCSF . 24 Table 1 APL of increasing window patterns . 10 Table 2 Temporal contrast sensitivity function 18 Table A.1 Luminance values of L(t) 25 4 IEC 61747-30-4:2016 IEC 2016 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LIQUID CRYSTAL DISPLAY DEVICES Part 30-4: Measuring methods for liquid crysta
19、l display modules Dynamic backlight units FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all q
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30、0: Electronic display devices. The text of this standard is based on the following documents: FDIS Report on voting 110/753/FDIS 110/769/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been d
31、rafted in accordance with the ISO/IEC Directives, Part 2. IEC 61747-30-4:2016 IEC 2016 5 A list of all parts in the IEC 61747 series, published under the general title Liquid crystal display devices, can be found on the IEC website. The committee has decided that the contents of this publication wil
32、l remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may
33、 be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 6 IEC 61747-30-4:2
34、016 IEC 2016 LIQUID CRYSTAL DISPLAY DEVICES Part 30-4: Measuring methods for liquid crystal display modules Dynamic backlight units 1 Scope This part of IEC 61747 specifies the standard measurement conditions and measuring methods for determining the optical performance and power consumption of acti
35、ve matrix liquid crystal display modules with dynamic backlight units. 2 Normative references 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 edition cited applies. For undated referen
36、ces, the latest edition of the referenced document (including any amendments) applies. IEC 61747-1-2, Liquid crystal display devices Part 1-2: Generic Terminology and letter symbols IEC 61747-30-1:2012, Liquid crystal display devices Part 30-1: Measuring methods for liquid crystal display modules Tr
37、ansmissive type IEC 62087, Methods of measurement for the power consumption of audio, video and related equipment ISO 11664-1, Colorimetry Part 1: CIE standard colorimetric observers 3 Terms, definitionsand abbreviations For the purposes of this document, the terms, definitions, symbols and units gi
38、ven in IEC 61747-1-2, as well as the following apply. 3.1 Terms and definitions 3.1.1 judder motion-dependent temporal instability of a moving pattern Note 1 to entry: Rather than smooth motion, there may be hesitations, inconsistencies, or other interruptions of the smooth motion of the moving cont
39、ent. 3.2 Abbreviations APL average picture level CCD charge coupled device CIE Commission Internationale de lEclairage (International Commission on Illumination) CIELAB CIE 1976 (L*a*b*) colour space DUT device under test HVS human visual system IEC 61747-30-4:2016 IEC 2016 7 LED light emitting diod
40、e LMD light measuring device PSF point spread function RGB red, green, blue SLSF spectral line spread function TCSF temporal contrast sensitivity function 4 Standard measuring equipment The system configuration and operating conditions of the measuring equipment shall comply with the structures spec
41、ified in each item. To ensure reliable measurements, the following requirements shall apply to the light measuring equipment, listed below: a) Luminance meter: the instruments spectral responsivity shall comply with the relative luminance uncertainty of the measured luminance and shall not be greate
42、r than 4 % for luminance values over 10 cd/m 2and not be greater than 10 % for luminance values 10 cd/m 2and below. b) Colourimeter: the detectors spectral responsivity shall comply with the colour-matching functions for the CIE 1931 standard colourimetric observer with a chromaticity accuracy of 0,
43、004 for x y. A correction factor can be used for the required accuracy by application of a standard source with a similar spectral distribution as the module to be measured. c) Imaging colourimeter: the number of pixels within the measurement field of view of the colourimeters detector shall not be
44、less than 4 for each display subpixel and not be less than a 12-bit digital resolution. The spectral responsivity shall comply as colour-matching functions for the CIE 1931 standard colourimetric observer with a chromaticity accuracy of 0,004 for x y. d) Fast-response photometer: the linearity shall
45、 be better than 0,5 % in a measured dynamic range. A 3 dB cut-off frequency shall be higher than1 kHz. 5 Measuring conditions 5.1 Standard measuring environmental conditions Measurements shall be carried out under the standard environmental conditions: temperature: 25 C 3 C, relative humidity: 25 %
46、to 85 % RH, atmospheric pressure: 86 kPa to 106 kPa. When different environmental conditions are used, they shall be noted in the measurement report. 5.2 Power supply The power supply for driving the DUT shall be adjusted to the rated voltage, 0,5 %. The frequency of the power supply shall also prov
47、ide the rated frequency, 0,2 %. 5.3 Warm-up time Measurements shall be carried out after sufficient warm-up. Sufficient warm-up is defined as the time elapsed from when the supply source is switched on, and a 100 % grey level of input signal is applied to the DUT, until repeated measurements of the
48、module show a variation in 8 IEC 61747-30-4:2016 IEC 2016 luminance of no more than 1 % per 5 min for at least 5 sampling points; the warm-up duration should be no less than 15 min. 5.4 Standard measuring dark-room conditions The luminance contribution from the background illumination reflected off
49、the test module in a direction perpendicular to the test module shall be less than 0,03 cd/m 2 . If these conditions are not satisfied, then background subtraction is required and it shall be noted on the report. In addition, if the sensitivity of the LMD is inadequate to measure these low levels of luminance from the background illumination reflected off the test module, then the lower limit of the LMD shall be noted in the measureme
