BSI PD IEC TR 62595-1-4:2020

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Display lighting unit – Glass light guide plate

Published By	Publication Date	Number of Pages
BSI	2020	28

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This part of IEC 62595, which is a Technical Report, provides general information for judging the necessity of future standardization of glass light guide plates for display lighting units, which include backlight units for transmissive displays such as LCDs, and frontlight units for reflective displays.

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PDF Pages	PDF Title
2	undefined
4	CONTENTS
6	FOREWORD
8	1 Scope 2 Normative references 3 Terms, definitions and abbreviated terms 3.1 Terms and definitions 3.2 Abbreviated terms
9	4 Overview 4.1 General 4.2 Light guide plate technologies and its typical materials Figures Figure 1 – Structure of edge-lit BLU and LGP
10	4.3 Advantages of and issues with GLGP Figure 2 – Light propagation in an LGP Tables Table 1 – Comparison between polymers and glasses for LGP
11	5 Optical characteristics 5.1 Factors affecting optical characteristics of GLGPs 5.2 Optical absorption of the glass materials for LGPs
12	Figure 3 – Examples of internal transmittance spectra at 50 cm in the optical path length Figure 4 – Chromaticity gradient against the distance from the incident edge
13	5.3 Optical absorption and scattering loss caused by the dot pattern 5.4 Incident loss
14	5.5 Effect of the reflection tapes 5.6 Discussions for possible future standardization 5.6.1 Applicability of existing standards Figure 5 – Variation of the relative BLU luminance against the thickness of the GLGP
15	5.6.2 Mechanical structure and interface 5.6.3 Hotspot influence caused by LED light source 5.6.4 Non uniformity around the edge 5.6.5 Optical absorption of glass materials for LGPs 6 Mechanical and environmental characteristics 6.1 General
16	6.2 Rigidity Table 2 – Physical properties of commercial glass for LGP and PMMA
17	6.3 Thermal expansion and heat resistance/noninflammability Figure 6 – Weight/thickness dependence of the rigidity of PMMA and glass for LGPs Figure 7 – Schematics of the simulation setup for the deformation calculation of the LGP by pulling up one corner and fixing the other three corners Table 3 – Comparison of thickness, weight, and calculated deformation between GLGP, PMMA LGP, and PMMA combined with steel plate
18	Figure 8 – Horizontal bowing of polymeric LGPs under elevated temperature
19	6.4 Humidity absorption Figure 9 – Simulated temperature distribution of (a) GLGP and (b) PMMA LGP Figure 10 – Simulated thermal deformation of (a) GLGP and (b) PMMA LGP due to LED lighting
20	6.5 Impact resistance Figure 11 – Increase in the horizontal length of LGP with temperature change for a 65” diagonal LGP Table 4 – Comparison of GLGP and polymer LGP in confined structure under humid condition
21	6.6 Discussions for possible future standardization 7 Additional functions and possible future standardization 7.1 General 7.2 Local dimming for HDR TV Table 5 – Impact resistance with different machining
22	7.3 Curved GLGP for curved LCD Figure 12 – Example of curved LCD using a curved GLGP
23	7.4 Quantum dot coating and quantum dot coated film LCD 7.5 Frontlight 7.6 Transparent LCD Figure 13 – Example of transparent LCD
24	7.7 Combination with PDLC Figure 14 – Example of transparent LCD with GLGP including PDLC
25	Bibliography