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BS IEC 62595-2-5:2021 Display lighting unit - Measurement method for optical quantities of non-planar light sources, 2021
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- CONTENTS
- FOREWORD
- INTRODUCTION
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, abbreviated terms and letter symbols [Go to Page]
- 3.1 Terms and definitions
- 3.2 Abbreviated terms
- 3.3 Letter symbols (quantity symbols/unit symbols)
- Tables [Go to Page]
- Table 1 – Letter symbols (quantity symbols/unit symbols)
- 4 Measurement devices [Go to Page]
- 4.1 General
- 4.2 Spot-type light measuring device
- Figures [Go to Page]
- Figure 1 – Cartesian and spherical coordinate systems for NPLS measurement
- 4.3 Spectroradiometer (spectral radiance-meter)
- 4.4 Electrical measurement devices [Go to Page]
- 4.4.1 Current meter
- Figure 2 – Example of LMD with the viewing area surrounding the measurement field [Go to Page]
- 4.4.2 Voltage meter
- 4.5 Luminous flux measurement devices [Go to Page]
- 4.5.1 General
- 4.5.2 Luminous flux
- Figure 3 – Current and voltage measurements using an ammeter between points C and D and a voltage meter between points A and B
- Figure 4 – Geometry of 4π-sphere measurement [Go to Page]
- 4.5.3 Sample stage
- 5 General measuring conditions [Go to Page]
- 5.1 Standard conditions
- Figure 5 – Measuring points on convex and concave DUTs based on the setups of Figure 4
- Figure 6 – Example of a mirror type goniometric system
- 5.2 Darkroom conditions
- 5.3 Measurement setup
- 5.4 Setting the electrical characteristics of measurement devices [Go to Page]
- 5.4.1 Conditions
- 5.4.2 Current
- 5.4.3 Voltage
- 5.4.4 Power
- 5.4.5 Warm-up time
- 6 Optical measurement methods [Go to Page]
- 6.1 General
- 6.2 Conditions
- 6.3 Perceptual visual quality [Go to Page]
- 6.3.1 General
- 6.3.2 Procedures
- 6.4 Lateral and directional scanning configuration [Go to Page]
- 6.4.1 General
- 6.4.2 Lateral scanning configuration
- Figure 7 – Planar LS and cylindrical LS (NPLS) in lateral scanning measurement arrangements [Go to Page]
- 6.4.3 Directional scanning configuration
- Figure 8 – Planar LS and cylindrical LS (NPLS) in a directional scanning arrangement
- 6.5 Depth-of-field and depth-of-focus in measurement [Go to Page]
- 6.5.1 General
- 6.5.2 Front and rear depth-of-field (DoF)
- Figure 9 – Pictorial illustration of depth-of-field, depth-of-focus and circle of confusion for an LMD [Go to Page]
- 6.5.3 Front and rear depth-of-focus (dof)
- 6.6 Measurement procedures [Go to Page]
- 6.6.1 General
- 6.6.2 Cylindrical LS mounting for lateral measurements
- Figure 10 – Rear depth-of-field in the measurement setup of a cylindrical light source [Go to Page]
- 6.6.3 Lateral luminance
- 6.6.4 Lateral luminance uniformity
- 6.6.5 Lateral chromaticity and chromaticity variation
- 6.6.6 Directional luminance
- 6.6.7 Directional luminance variations
- 6.6.8 Directional chromaticity and chromaticity variation
- 6.6.9 Luminous flux
- 7 Precautions [Go to Page]
- 7.1 Remarks
- 7.2 Further remarks [Go to Page]
- 7.2.1 General
- 7.2.2 Report
- Annexes [Go to Page]
- Annex A (informative) Measurement field on the curved light source [Go to Page]
- A.1 General
- A.2 NPLS curvature and measurement field
- Figure A.1 – Schematic diagram of the optical characteristics measurement of planar, convex and concave cylindrical light source [Go to Page]
- A.3 MFs on planar, convex and concave cylindrical LSs
- Annex B (informative) Planar light source measurement [Go to Page]
- B.1 General
- B.2 Luminance meter and measurement field
- Table B.1 – Example of a measurement result
- Annex C (informative) Contours of light measurement fields on planar, cylindrical convex, and concave light sources [Go to Page]
- C.1 General
- C.2 MF contour on a non-tilt and tilt planar DUT
- Figure C.1 – Geometry of intersections of a cone anda plane in non-tilt and tilt conditions [Go to Page]
- C.3 Projection of an MF contour on the outer surface of a cylindrical DUT
- Figure C.2 – Expanded plane of a cone and intersection lines with tilt and non-tilt planes (see Figure C.1)
- Figure C.3 – Simulated intersections of three planar light sources with a cone (measurement field angle, i.e., a solid angle)
- Figure C.4 – Geometry for calculating the intersection of a cone (measurement field angle; solid angle) and a cylinder (light source)
- Figure C.5 – Intersection of a cone and a cylindrical DUT
- Figure C.6 – Measurement of a convex cylindrical LS and the possible cases, and illustration of the effect of the measurement field angle cone and the angleof inclination of the measurement direction
- Annex D (informative) LMD aperture and inclination angle on a cylindrical light source [Go to Page]
- D.1 General
- D.2 Inclination angle
- Figure D.1 – Measurement of a cylindrical light source fora non-zero aperture LMD and fixed measurement field (b) [Go to Page]
- D.3 Inclination angle variation
- Figure D.2 – Variation of inclination angle, (D, with DLMD for each cylindrical LS of radius R [Go to Page]
- D.4 Depth-of-field
- Figure D.3 – Variation of rear DoF with DLMD (for measurement field angles of 2°, 1°, 0,2°, 0,1°) for zero aperture LMD
- Table D.1 – Variation of inclination angles with half of the MF size; b/2 [Go to Page]
- D.5 Measurement field size on the cylindrical light source
- Figure D.4 – Rear DoF variations with measurement distance DLMD, for light source of R2 (R = 20 mm, 35 mm, 50 mm) in Annex A
- Figure D.5 – Variation of measurement field with DLMD for cylindrical light sources of radii (=R2) R = 20 mm, 35 mm, 50 mm, and measurement field angles of β = 2°, 1°, 0,2°, 0,1°
- Figure D.6 – Difference in variation of MF with DLMD for radii (=R2) R = 20 mm, 35 mm, 50 mm
- Bibliography [Go to Page]
