WO2020200408A1 - Display stack for electronic device - Google Patents

Display stack for electronic device Download PDF

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Publication number
WO2020200408A1
WO2020200408A1 PCT/EP2019/058100 EP2019058100W WO2020200408A1 WO 2020200408 A1 WO2020200408 A1 WO 2020200408A1 EP 2019058100 W EP2019058100 W EP 2019058100W WO 2020200408 A1 WO2020200408 A1 WO 2020200408A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
arrangement
display
display stack
transparent covering
Prior art date
Application number
PCT/EP2019/058100
Other languages
French (fr)
Inventor
Petri Savolainen
Sami MAATTANEN
Jari Romo
Vishal GANDHI
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN201980094631.5A priority Critical patent/CN113950755A/en
Priority to PCT/EP2019/058100 priority patent/WO2020200408A1/en
Publication of WO2020200408A1 publication Critical patent/WO2020200408A1/en

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens

Definitions

  • the disclosure relates to a display stack for an electronic device comprising a transparent covering arrangement and a displaying arrangement.
  • Polarizers are used in displays of electronic devices such as smartphones in order to either change the polarization of light produced by a backlight unit to a required state, or to block unwanted reflections by changing the polarization state of the incoming light in such a way that it will not pass the polarizer to the opposite direction.
  • a display stack for an electronic device comprising a transparent covering arrangement comprising at least one layer, a displaying arrangement comprising a plurality of parallel layers, a polarizing layer arranged within the transparent covering arrangement or between the transparent covering arrangement and the displaying arrangement, the polarizing layer being coated directly onto one of the layers of the transparent covering arrangement or onto a peripheral layer of the displaying arrangement facing the transparent covering arrangement, a first adhesive layer attaching the polarizing layer to one of the transparent covering arrangement and the displaying arrangement or attaching the transparent covering arrangement to the displaying arrangement.
  • Such a solution facilitates a display stack which has a thinner and more flexible polarizer than prior art, which is needed in order to achieve similar optical performance while also having better reliability than prior art solutions. Furthermore, the present solution eliminates the separate process step of fixing polarizers onto the display stack, since the polarizing layer can be applied in the transparent covering arrangement or onto the displaying arrangement by the component supplier, instead of during assembly. This not only simplifies the assembly process but also reduces time spent and costs generated.
  • the polarizing layer comprises a linear or a circular polarizer.
  • the polarizing layer comprises only one material, as opposed to prior art polarizers which comprise several layers, still only one layer providing the polarizing function.
  • the other layers are, e.g., for mechanical support and protection.
  • the polarizing layer comprises liquid crystal polymer material.
  • the displaying arrangement comprises a display structure, allowing the displaying arrangement to comprise partially or fully of a pre assembled component.
  • the display structure comprises a further polarizing layer preferably being a peripheral layer of the display structure located farthest from the transparent covering arrangement, allowing a change of the polarization of light produced by e.g. a backlight unit.
  • the display structure display structure comprises one of an OLED display and an AMOLED display, facilitating choosing a suitable display structure considering optical and mechanical restrictions.
  • the display structure comprises a touch sensor.
  • the displaying arrangement further comprises a touch sensor layer and a second adhesive layer, the second adhesive layer attaching the touch sensor layer to the display structure.
  • the polarizing layer is arranged between the cover layer and the touch sensor layer or the peripheral layer of the display structure facing the transparent covering arrangement.
  • the transparent covering arrangement comprises at least one cover layer.
  • the transparent covering arrangement comprises a plurality of cover layers, each pair of adjacent cover layers being attached to each other by means of a third adhesive layer, facilitating flexibility in the design of the transparent covering arrangement.
  • the polarizing layer is arranged between the cover layer and the first adhesive layer.
  • the polarizing layer is arranged between the cover layer and the third adhesive layer.
  • the transparent covering arrangement comprises a hard coating attached to the cover layer, providing additional protection to the outer surface of the cover layer.
  • the polarizing layer is arranged between the cover layer and the hard coating, providing additional protection to the polarizing layer.
  • the cover layer comprises one of glass or polymer material, facilitating choosing a suitable cover layer material depending on the chosen display structure.
  • first, second, and third adhesive layers comprise optically clear adhesive.
  • a process for manufacturing a display stack according to the above wherein the polarizer layer is coated directly onto an adjacent layer, the adjacent layer being one of the cover layer, a peripheral layer of the display structure, and the touch sensor layer, allowing a simplified assembly process generating less costs.
  • an electronic device comprising a display stack according to the above, wherein a peripheral surface of the electronic device comprises the hard coating or the cover layer of the display stack, facilitating an electronic device having a display which is lighter and which has better reliability than prior art solutions.
  • Fig. 1 shows a schematic illustration of a display stack in accordance with one embodiment of the present invention
  • Fig. 2 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention
  • Fig. 3 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention
  • Fig. 4 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention.
  • Fig. 5 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention.
  • the present disclosure relates to an electronic device comprising a display stack 1.
  • a peripheral layer of the display stack 1 such as the hard coating 9 or the cover layer 8, described in more detail below, makes up a peripheral surface of the electronic device.
  • the peripheral surface may, e.g., be a part of the front surface of the electronic device, the entire front surface of the electronic device, or the front surface and one or more side surfaces of the electronic device.
  • the display stack 1 comprises a transparent covering arrangement 2, comprising at least one layer, and a displaying arrangement 3, comprising a plurality of parallel layers. All layers of the display stack 1 extend in parallel with each other, and in parallel with a main plane of the display stack 1. Furthermore, all layers, except for the two peripheral layers at either side of the display stack 1 , are arranged in direct abutment with two adjacent layers, since there are no air gaps within the display stack 1.
  • the display stack 1 further comprises a polarizing layer 4 arranged either within the transparent covering arrangement 2, as shown in Figs. 2, 3, and 5, or between the transparent covering arrangement 2 and the displaying arrangement 3, as shown in Figs. 1 and 4. Regardless of the location of the polarizing layer 4, the polarizing layer 4 is coated directly onto an adjacent layer. As shown in Fig. 1, the polarizing layer 4 may be coated directly onto the peripheral layer of the displaying arrangement 3 which faces the transparent covering arrangement 2. As shown in Figs. 2 to 5, the polarizing layer 4 may be coated directly onto one of the layers of the transparent covering arrangement 2.
  • the display stack 1 further comprises a first adhesive layer 5a.
  • the first adhesive layer 5a may attach the polarizing layer 4 to a layer of the transparent covering arrangement 2, as shown in Figs. 1 to 3.
  • the first adhesive layer 5 a may attach the polarizing layer 4 to a layer of the displaying arrangement 3, as shown in Fig. 4.
  • the first adhesive layer 5a may attach the transparent covering arrangement 2 to the displaying arrangement 3, as shown in Fig. 5.
  • the displaying arrangement 3 may comprises a display structure 6.
  • the display structure 6 may comprises a touch sensor, located within a panel layer of the display structure 6 (not shown).
  • the displaying arrangement 3 may furthermore comprise a touch sensor layer 7 and a second adhesive layer 5b, the second adhesive layer 5b attaching the touch sensor layer 7 to the display structure 6.
  • the polarizer layer 4 may be coated directly onto the touch sensor layer 7, whereafter the polarizer layer 4 is attached to the cover layer 8, 8b of the transparent covering arrangement 2 by means of the first adhesive layer 5 a.
  • the display structure 6 may comprise an OLED display, as shown in Figs. 1 to 3, in which case the display structure comprises at least an OLED panel, a base film layer, a cushion layer, and a metal sheet.
  • the cover layer 8 comprises glass or a polymer material such as polyimide.
  • the display structure 6 may comprise a further polarizing layer 4 preferably being a peripheral layer of the display structure 6 located farthest from the transparent covering arrangement 2 (not shown).
  • the display structure 6 may comprise an AMOLED display, as shown in Figs. 4 and 5, in which case the display structure comprises at least an encap glass, a TFT glass, and a cushion.
  • the cover layer 8 preferably comprises glass, but may also comprise a polymer material such as polyimide.
  • the polarizing layer 4 comprises a linear polarizer, suitable when the display structure 6 comprises an LCD display.
  • the polarizing layer 4 comprises a circular polarizer, suitable when the display structure 6 comprises an OLED display or an AMOLED display.
  • the circular polarizer may, e.g., comprise of a linear polarizer and a quarter wave plate. Other solutions are however conceivable.
  • the polarizing layer 4 comprises only one material, preferably a liquid crystal polymer material.
  • the polarizing layer 4 may comprise of two sub-layers coated onto each other. For example, for a circular polarizer comprising a linear polarizer sub-layer and a quarter wave sub-layer, the two sub-layers are coated as separate layers, the two sub-layers comprising of the same base material but having different polymer molecule orientation.
  • the transparent covering arrangement 2 comprises at least one cover layer 8. As shown in Fig. 4, the transparent covering arrangement 2 may comprise only one cover layer 8.
  • the polarizing layer 4 may be arranged between the cover layer 8 and the first adhesive layer 5a, or between the cover layer 8 and the hard coating 9 (not shown).
  • the transparent covering arrangement 2 may comprise of a plurality of cover layers 8a, 8b, e.g. two cover layers, each pair of cover layers 8a, 8b being attached to each other by means of a third adhesive layer 5c.
  • the transparent covering arrangement 2 may furthermore comprise a hard coating 9 attached to the cover layer 8, 8a.
  • the polarizing layer 4 may be arranged between the cover layer 8b and the first adhesive layer 5a (not shown), or between the cover layer 8a and the third adhesive layer 5c, as shown in Figs. 2 and 5. Furthermore, the polarizing layer 4 may be arranged between the cover layer 8a and the hard coating 9, as shown in Fig. 3. The polarizing layer 4 may be arranged between the first adhesive layer 5a and the peripheral layer of the displaying arrangement 3 facing said transparent covering arrangement 2, i.e. the touch sensor layer 7, as shown in Fig. 1, or the peripheral layer of the display structure 6 facing the transparent covering arrangement 2.
  • the first, second, and third adhesive layers 5a, 5b, 5c comprise optically clear adhesive.
  • the present disclosure further relates to a process for manufacturing the above described display stack 1, wherein the polarizer layer 4 is coated directly onto an adjacent layer, the adjacent layer being one of the cover layer 8, 8a, 8b, a peripheral layer of the display structure 6, and the touch sensor layer 7.

Abstract

A display stack (1) for an electronic device comprising a transparent covering arrangement (2) comprising a plurality of parallel layers and a displaying arrangement (3) comprising a plurality of parallel layers. A polarizing layer (4) is arranged within the transparent covering arrangement (2) or between the transparent covering arrangement (2) and the displaying arrangement (3). A first adhesive layer (5 a) attaches the polarizing layer (4) to one of the transparent covering arrangement (2) and the displaying arrangement (3) or attaches the transparent covering arrangement (2) to the displaying arrangement (3). The polarizing layer (4) is coated directly onto one of the plurality of parallel layers within the transparent covering arrangement (2) or within the displaying arrangement (3). This facilitates a display stack which has similar optical performance and higher reliability than prior art.

Description

DISPLAY STACK FOR ELECTRONIC DEVICE
TECHNICAL FIELD
The disclosure relates to a display stack for an electronic device comprising a transparent covering arrangement and a displaying arrangement.
BACKGROUND
Polarizers are used in displays of electronic devices such as smartphones in order to either change the polarization of light produced by a backlight unit to a required state, or to block unwanted reflections by changing the polarization state of the incoming light in such a way that it will not pass the polarizer to the opposite direction.
Current polarizers are both relatively thick, heavy, and stiff, making them unsuitable in particular for three-dimensional, pre-bent displays and dynamically foldable displays. Furthermore, such polarizers are both difficult and expensive to process, since they have a complex structure and have to be fitted to the display stack in a completely separate process step.
SUMMARY
It is an object to provide an improved display stack. The foregoing and other objects are achieved by the features of the independent claims. Further implementation forms are apparent from the dependent claims, the description, and the figures.
According to a first aspect, there is provided a display stack for an electronic device comprising a transparent covering arrangement comprising at least one layer, a displaying arrangement comprising a plurality of parallel layers, a polarizing layer arranged within the transparent covering arrangement or between the transparent covering arrangement and the displaying arrangement, the polarizing layer being coated directly onto one of the layers of the transparent covering arrangement or onto a peripheral layer of the displaying arrangement facing the transparent covering arrangement, a first adhesive layer attaching the polarizing layer to one of the transparent covering arrangement and the displaying arrangement or attaching the transparent covering arrangement to the displaying arrangement.
Such a solution facilitates a display stack which has a thinner and more flexible polarizer than prior art, which is needed in order to achieve similar optical performance while also having better reliability than prior art solutions. Furthermore, the present solution eliminates the separate process step of fixing polarizers onto the display stack, since the polarizing layer can be applied in the transparent covering arrangement or onto the displaying arrangement by the component supplier, instead of during assembly. This not only simplifies the assembly process but also reduces time spent and costs generated.
Additionally, there is an increased flexibility as regards the location of the polarizing layer within the display stack, taking optical and mechanical design goals into consideration.
In a possible implementation form of the first aspect, the polarizing layer comprises a linear or a circular polarizer.
In a further possible implementation form of the first aspect, the polarizing layer comprises only one material, as opposed to prior art polarizers which comprise several layers, still only one layer providing the polarizing function. The other layers are, e.g., for mechanical support and protection.
In a further possible implementation form of the first aspect, the polarizing layer comprises liquid crystal polymer material.
In a further possible implementation form of the first aspect, the displaying arrangement comprises a display structure, allowing the displaying arrangement to comprise partially or fully of a pre assembled component.
In a further possible implementation form of the first aspect, the display structure comprises a further polarizing layer preferably being a peripheral layer of the display structure located farthest from the transparent covering arrangement, allowing a change of the polarization of light produced by e.g. a backlight unit.
In a further possible implementation form of the first aspect, the display structure display structure comprises one of an OLED display and an AMOLED display, facilitating choosing a suitable display structure considering optical and mechanical restrictions.
In a further possible implementation form of the first aspect, the display structure comprises a touch sensor.
In a further possible implementation form of the first aspect, the displaying arrangement further comprises a touch sensor layer and a second adhesive layer, the second adhesive layer attaching the touch sensor layer to the display structure.
In a further possible implementation form of the first aspect, the polarizing layer is arranged between the cover layer and the touch sensor layer or the peripheral layer of the display structure facing the transparent covering arrangement.
In a further possible implementation form of the first aspect, the transparent covering arrangement comprises at least one cover layer.
In a further possible implementation form of the first aspect, the transparent covering arrangement comprises a plurality of cover layers, each pair of adjacent cover layers being attached to each other by means of a third adhesive layer, facilitating flexibility in the design of the transparent covering arrangement. In a further possible implementation form of the first aspect, the polarizing layer is arranged between the cover layer and the first adhesive layer.
In a further possible implementation form of the first aspect, the polarizing layer is arranged between the cover layer and the third adhesive layer. In a further possible implementation form of the first aspect, the transparent covering arrangement comprises a hard coating attached to the cover layer, providing additional protection to the outer surface of the cover layer.
In a further possible implementation form of the first aspect, the polarizing layer is arranged between the cover layer and the hard coating, providing additional protection to the polarizing layer.
In a further possible implementation form of the first aspect, the cover layer comprises one of glass or polymer material, facilitating choosing a suitable cover layer material depending on the chosen display structure.
In a further possible implementation form of the first aspect, the first, second, and third adhesive layers comprise optically clear adhesive.
According to a second aspect, there is a process for manufacturing a display stack according to the above, wherein the polarizer layer is coated directly onto an adjacent layer, the adjacent layer being one of the cover layer, a peripheral layer of the display structure, and the touch sensor layer, allowing a simplified assembly process generating less costs.
According to a third aspect, there is provided an electronic device comprising a display stack according to the above, wherein a peripheral surface of the electronic device comprises the hard coating or the cover layer of the display stack, facilitating an electronic device having a display which is lighter and which has better reliability than prior art solutions.
This and other aspects will be apparent from and the embodiments described below.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed portion of the present disclosure, the aspects, embodiments and implementations will be explained in more detail with reference to the example embodiments shown in the drawings, in which: Fig. 1 shows a schematic illustration of a display stack in accordance with one embodiment of the present invention;
Fig. 2 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention;
Fig. 3 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention;
Fig. 4 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention;
Fig. 5 shows a schematic illustration of a display stack in accordance with a further embodiment of the present invention.
DETAILED DESCRIPTION
The present disclosure relates to an electronic device comprising a display stack 1. A peripheral layer of the display stack 1 , such as the hard coating 9 or the cover layer 8, described in more detail below, makes up a peripheral surface of the electronic device. The peripheral surface may, e.g., be a part of the front surface of the electronic device, the entire front surface of the electronic device, or the front surface and one or more side surfaces of the electronic device.
Different embodiments of the display stack 1 are shown in Figs. 1 to 5. The display stack 1 comprises a transparent covering arrangement 2, comprising at least one layer, and a displaying arrangement 3, comprising a plurality of parallel layers. All layers of the display stack 1 extend in parallel with each other, and in parallel with a main plane of the display stack 1. Furthermore, all layers, except for the two peripheral layers at either side of the display stack 1 , are arranged in direct abutment with two adjacent layers, since there are no air gaps within the display stack 1.
The display stack 1 further comprises a polarizing layer 4 arranged either within the transparent covering arrangement 2, as shown in Figs. 2, 3, and 5, or between the transparent covering arrangement 2 and the displaying arrangement 3, as shown in Figs. 1 and 4. Regardless of the location of the polarizing layer 4, the polarizing layer 4 is coated directly onto an adjacent layer. As shown in Fig. 1, the polarizing layer 4 may be coated directly onto the peripheral layer of the displaying arrangement 3 which faces the transparent covering arrangement 2. As shown in Figs. 2 to 5, the polarizing layer 4 may be coated directly onto one of the layers of the transparent covering arrangement 2.
The display stack 1 further comprises a first adhesive layer 5a. The first adhesive layer 5a may attach the polarizing layer 4 to a layer of the transparent covering arrangement 2, as shown in Figs. 1 to 3. The first adhesive layer 5 a may attach the polarizing layer 4 to a layer of the displaying arrangement 3, as shown in Fig. 4. The first adhesive layer 5a may attach the transparent covering arrangement 2 to the displaying arrangement 3, as shown in Fig. 5.
The displaying arrangement 3 may comprises a display structure 6. The display structure 6 may comprises a touch sensor, located within a panel layer of the display structure 6 (not shown). The displaying arrangement 3 may furthermore comprise a touch sensor layer 7 and a second adhesive layer 5b, the second adhesive layer 5b attaching the touch sensor layer 7 to the display structure 6. In a further embodiment, shown in Fig. 1, the polarizer layer 4 may be coated directly onto the touch sensor layer 7, whereafter the polarizer layer 4 is attached to the cover layer 8, 8b of the transparent covering arrangement 2 by means of the first adhesive layer 5 a.
The display structure 6 may comprise an OLED display, as shown in Figs. 1 to 3, in which case the display structure comprises at least an OLED panel, a base film layer, a cushion layer, and a metal sheet. When using an OLED display, the cover layer 8 comprises glass or a polymer material such as polyimide.
The display structure 6 may comprise a further polarizing layer 4 preferably being a peripheral layer of the display structure 6 located farthest from the transparent covering arrangement 2 (not shown).
The display structure 6 may comprise an AMOLED display, as shown in Figs. 4 and 5, in which case the display structure comprises at least an encap glass, a TFT glass, and a cushion. When using an AMOLED display, the cover layer 8 preferably comprises glass, but may also comprise a polymer material such as polyimide.
In one embodiment, the polarizing layer 4 comprises a linear polarizer, suitable when the display structure 6 comprises an LCD display. In a further embodiment, the polarizing layer 4 comprises a circular polarizer, suitable when the display structure 6 comprises an OLED display or an AMOLED display. The circular polarizer may, e.g., comprise of a linear polarizer and a quarter wave plate. Other solutions are however conceivable.
In one embodiment, the polarizing layer 4 comprises only one material, preferably a liquid crystal polymer material. The polarizing layer 4 may comprise of two sub-layers coated onto each other. For example, for a circular polarizer comprising a linear polarizer sub-layer and a quarter wave sub-layer, the two sub-layers are coated as separate layers, the two sub-layers comprising of the same base material but having different polymer molecule orientation.
As mentioned above, the transparent covering arrangement 2 comprises at least one cover layer 8. As shown in Fig. 4, the transparent covering arrangement 2 may comprise only one cover layer 8. For such embodiments, the polarizing layer 4 may be arranged between the cover layer 8 and the first adhesive layer 5a, or between the cover layer 8 and the hard coating 9 (not shown).
As shown in Figs. 1 to 3 and 5, the transparent covering arrangement 2 may comprise of a plurality of cover layers 8a, 8b, e.g. two cover layers, each pair of cover layers 8a, 8b being attached to each other by means of a third adhesive layer 5c. The transparent covering arrangement 2 may furthermore comprise a hard coating 9 attached to the cover layer 8, 8a.
For embodiments comprising at least two cover layers 8a, 8b, the polarizing layer 4 may be arranged between the cover layer 8b and the first adhesive layer 5a (not shown), or between the cover layer 8a and the third adhesive layer 5c, as shown in Figs. 2 and 5. Furthermore, the polarizing layer 4 may be arranged between the cover layer 8a and the hard coating 9, as shown in Fig. 3. The polarizing layer 4 may be arranged between the first adhesive layer 5a and the peripheral layer of the displaying arrangement 3 facing said transparent covering arrangement 2, i.e. the touch sensor layer 7, as shown in Fig. 1, or the peripheral layer of the display structure 6 facing the transparent covering arrangement 2.
In one embodiment, the first, second, and third adhesive layers 5a, 5b, 5c comprise optically clear adhesive. The present disclosure further relates to a process for manufacturing the above described display stack 1, wherein the polarizer layer 4 is coated directly onto an adjacent layer, the adjacent layer being one of the cover layer 8, 8a, 8b, a peripheral layer of the display structure 6, and the touch sensor layer 7.
The various aspects and implementations have been described in conjunction with various embodiments herein. However, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed subject-matter, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word“comprising” does not exclude other elements or steps, and the indefinite article“a” or“an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.
The reference signs used in the claims shall not be construed as limiting the scope.

Claims

1. A display stack (1) for an electronic device comprising
a transparent covering arrangement (2) comprising at least one layer;
a displaying arrangement (3) comprising a plurality of parallel layers;
a polarizing layer (4) arranged
- within said transparent covering arrangement (2) or
- between said transparent covering arrangement (2) and said displaying arrangement (3); said polarizing layer (4) being coated directly
- onto one of said layers of said transparent covering arrangement (2) or
- onto a peripheral layer of said displaying arrangement (3) facing said transparent covering arrangement (2); and
a first adhesive layer (5 a);
- attaching said polarizing layer (4) to one of said transparent covering arrangement (2) and said displaying arrangement (3) or
- attaching said transparent covering arrangement (2) to said displaying arrangement (3).
2. The display stack (1) according to claim 1, wherein said polarizing layer (4) comprises a linear or a circular polarizer.
3. The display stack (1) according to claims 1 or 2, wherein said polarizing layer (4) comprises only one material.
4. The display stack ( 1 ) according to claim 3 , wherein said polarizing layer (4) comprises liquid crystal polymer material.
5. The display stack (1) according to any one of the previous claims, wherein said displaying arrangement (3) comprises a display structure (6).
6. The display stack (1) according to claim 5, wherein said display structure (6) comprises a further polarizing layer (4), preferably being a peripheral layer of the display structure (6) located farthest from said transparent covering arrangement (2).
7. The display stack (1) according to claim 5, wherein said display structure (6) comprises one of an OLED display and an AMOLED display.
8. The display stack (1) according to any one of claims 5 to 7, wherein said display structure (6) comprises a touch sensor.
9. The display stack (1) according to any one of claims 5 to 7, wherein said displaying arrangement (3) further comprises a touch sensor layer (7) and a second adhesive layer (5b), said second adhesive layer (5b) attaching said touch sensor layer (7) to said display structure (6).
10. The display stack (1) according to any one of the previous claims, wherein said polarizing layer (4) is arranged between said cover layer (8, 8b) and said touch sensor layer (7) or said peripheral layer of said display structure (6) facing said transparent covering arrangement (2)·
11. The display stack (1) according to any one of the previous claims, wherein said transparent covering arrangement (2) comprises at least one cover layer (8).
12. The display stack (1) according to claim 11, wherein said transparent covering arrangement
(2) comprises a plurality of cover layers (8a, 8b), each pair of adjacent cover layers (8a, 8b) being attached to each other by means of a third adhesive layer (5 c).
13. The display stack (1) according to claim 12, wherein said polarizing layer (4) is arranged between said cover layer (8, 8b) and said first adhesive layer (5 a).
14. The display stack (1) according to claim 12, wherein said polarizing layer (4) is arranged between said cover layer (8a) and said third adhesive layer (5c).
15. The display stack (1) according to any one of claims 11 to 14, wherein said transparent covering arrangement (2) comprises a hard coating (9) attached to said cover layer (8, 8a).
16. The display stack (1) according to claim 15, wherein said polarizing layer (4) is arranged between said cover layer (8, 8a) and said hard coating (9).
17. The display stack (1) according to any one of claims 11 to 16, wherein said cover layer (8, 8a, 8b) comprises one of glass or polymer material.
18. The display stack (1) according to any one of the previous claims, wherein said first, second, and third adhesive layers (5a, 5b, 5c) comprise optically clear adhesive.
19. A process for manufacturing a display stack (1) according to any one of claims 1 to 18, wherein said polarizer layer (4) is coated directly onto an adjacent layer, said adjacent layer being one of the cover layer (8, 8a, 8b), a peripheral layer of the display structure (6), and the touch sensor layer (7).
20. An electronic device comprising a display stack (1) according to any one of claims 1 to 18, wherein a peripheral surface of said electronic device comprises the hard coating (9) or the cover layer (8) of said display stack (1).
PCT/EP2019/058100 2019-03-29 2019-03-29 Display stack for electronic device WO2020200408A1 (en)

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