Organic light emitting diode (OLED) light sources for general lighting - Safety - Part 2-3: Particular requirements - Flexible OLED tiles and panels
1 Scope
This document specifies the safety requirements for flexible organic light emitting diode tiles and panels for indoor and similar general lighting purposes and designed for being bent during the manufacturing process of curved luminaires.
This document applies to flexible OLED tiles and panels for use on supplies up to 120 V ripple free DC.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 39075.1-2023 Organic light emitting diode (OLED) light sources for general lighting - Safety - Part 1:General requirements and tests (IEC 62868-1:2020, IDT)
IEC 61747-40-1:2019 Liquid crystal display devices – Part 40-1: Mechanical testing of display cover glass for mobile devices – Guidelines
IEC 62504 General lighting – Light emitting diode (LED) products and related equipment – Terms and definitions
Note: GB/T 24826-2016, General lighting - Light emitting diode (LED) products and related equipment - Terms and definitions (IEC 62504:2014, IDT)
IEC 62715-6-3:2020 Flexible display devices – Part 6-3: Mechanical test methods – Impact and hardness tests
IEC TS 62972 General lighting – Organic light emitting diode (OLED) products and related equipment – Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62504, GB/T 39075.1-2023 and IEC TS 62972 and the following apply.
3.1
flexible OLED
OLED that is mechanically bendable in one or more of the steps of substrate handling, manufacturing, storage, use, operation, shipping, and relocation
3.2
flexible OLED tile
smallest functional flexible OLED which cannot be separated into smaller flexible OLED lighting elements containing at least one contact ledge with at least one positive and one negative pole for connection to the electrical power supply
3.3
flexible OLED panel
independently operable unit flexible OLED product containing a flexible OLED tile and means of connection to the electrical supply
Note: Such as a connector, printed circuit board (PCB), passive electronic components and optionally a frame.
3.4
glass-based flexible OLED
flexible OLED light source having a substrate and/or encapsulation material that are composed of thin glass
3.5
film-based flexible OLED
flexible OLED light source having components that are made of either barrier film or metal foil
3.6
barrier film
film that keeps water vapour out of an OLED light source
3.7
minimum bending radius
limit radius to which the flexible panel may be bent in either a convex or concave curvature without damaging the panel
3.8
maximum bending cycle
maximum number of times a flexible panel may be bent without damaging the panel
3.9
as-received
representative of standard sample preparation and handling practices, and therefore free of intentional mechanical damage such as abrasion, scratching, or indentation
Note 1: Intentional mechanical damage such as abrasion, scratches or indentations.
Note 2: The strength of glass is not an intrinsic material property, and like other brittle elastic materials, is highly dependent upon the surface flaw population. The term "as-received" is meant to represent the surface condition upon specimen receipt and is distinguished from a condition where damage has been intentionally introduced prior to testing.
[SOURCE: IEC 61747-40-1:2019, 3.2]
4 General
4.1 General requirements
The requirements of GB/T 39075.1-2023, 4.1 apply.
4.2 General test requirements
The requirements of GB/T 39075.1-2023, 4.2 apply.
The tests shall be carried out using a flexible OLED panel bent with the minimum bending radius specified by the manufacturer. For those flexible panels which are specified for a specific curvature, the test shall be conducted using the shape and condition specified by the manufacturer in the installation instructions.
Stabilization shall be conducted in the same conditions, for example the position and flat or bent, as the tests.
5 Marking
5.1 Contents and location
The requirements of GB/T 39075.1-2023, 5.1 apply. GB/T 39075.1-2023, Table 1 applies together with Table 1 of this document.
Table 1 – Additional marking
5.2 Durability and legibility of marking
The requirements of GB/T 39075.1-2023, 5.2 apply.
6 Construction
6.1 General
The requirements of GB/T 39075.1-2023, 6.1 apply.
The construction of flexible OLED tiles and panels is illustrated in Annex A.
6.2 Mechanical strength
6.2.1 Requirements
The OLED panel shall have sufficient mechanical strength which shall be checked by 6.2.2 and 6.2.3.
6.2.2 Vibration test
Compliance is checked by carrying out the test in accordance with GB/T 39075.1-2023, 6.2.
6.2.3 Strength and impact test
The strength and impact test shall be conducted depending on the classification of the OLED panel (see Annex B).
a) Glass-based flexible OLED product
The strength and impact test shall be conducted according to Table 2, in accordance with IEC 61747-40-1:2019, 5.1 , 5.2 and 5.4. Test (1) shall be conducted if the edges of bare panels are exposed after installation in the luminaire. As long as the panel is installed into the luminaire and no edge has been exposed, this test is not mandatory.
Where no glass edge is exposed, such as being installed into a luminaire or being covered with protecting films, tests (2) and (3) shall be conducted.
Where no glass surface is exposed, such as being installed into a luminaire or being covered with protecting films, tests (1) and (2) shall be conducted.
