Patent Description:
The size of electronic devices, such as tablets and mobile phones, is an important consideration when designing mobile devices. In order to provide the best mobile device possible, the outer dimensions of the device have to be as small as is technically feasible, while still allowing the display of the device to be as large as possible.

This problem may be solved by means of a foldable electronic device such as that of <CIT>, which discloses an electronic device comprising multiple housings interconnected by means of hinges and covered by one large display. The multiple housings, and the display, can be folded together to provide an as small device as possible, and unfolded to provide an as large display as possible.

Such a foldable solution has a reduced width when being folded together. However, the depth of the electronic device is substantial since several housing sections are stacked on top of each other. The depth may even be larger than the width, wherefore such a folded electronic device is bulky and aesthetically unappealing.

The provision of several housings not only makes the electronic device heavy and thick, but its foldable configuration also makes the electronic device electronically complicated.

Furthermore, the continuous folding of the display may lead to permanent deformation due to fatigue, since the folded area is subject to very high stress.

Document <CIT> describes an expandable mobile device, wherein the device includes first and second housing parts that slide-engage relative to each other to extend and retract the device. The expandable mobile device includes a flexible display that extends from an interior of the expandable mobile device as the second housing part slides out from the first housing part. The flexible display also retracts into the interior of the expandable mobile device as the second housing part slides into the first housing part. Rollers are integrated in the first housing part and bend the flexible display around a fixed radius to position a first section of the flexible display approximately parallel to a second section of the flexible display in a retracted position of the expandable mobile device.

Document <CIT> describes a display device. The display device comprises: a driving mechanism; a rolling mechanism; and a flexible display, the flexible display is supported by the rolling mechanism, and the driving mechanism drives the rolling mechanism to roll in cycles. According to this document, the display device described therein can realize rotational display, thereby satisfying the diversified demand of users.

Document <CIT> relates to a flexible display. In one aspect, the flexible display includes a flexible display panel including: a first portion, a third portion connected to the first portion, and a second portion connected to the third portion and opposing the first portion. The flexible display also includes a guide member fixed to the flexible display panel and arranged between the first and second portions and a housing supporting the flexible display panel and the guide member and arranged between the first and second portions. The flexible display further comprises a sliding member connected to the housing and the guide member and configured to move the second portion by substantially the same distance as and in an opposite direction to the first portion when the first portion is moved.

Document <CIT> discloses a display device which may include a support plate, a first display unit, a second display unit, a third display unit, a pad, and a circuit board. The first display unit overlaps the support plate. The second display unit is connected to the first display unit. A portion of the second display unit may move relative to the support plate. The third display unit is connected through the first display unit to the second display unit. A portion of the third display may move relative to the support plate. The pad includes a pad electrode that is electrically connected to the first display unit. The circuit board is electrically connected to the pad. A first section of the circuit board is bent relative to a second section of the circuit board and is oriented perpendicular or oblique with respect to the first display unit.

It is an object to provide an improved display arrangement. Further implementation forms are apparent from the dependent claims, the description, and the figures. Thus, present invention is set out by the set of appended claims. In the following, parts of the description and drawing referring to aspects, examples or implementations, which are not covered by the claims are not presented as embodiments of the invention, but as illustrative examples useful for understanding the invention.

According to a first aspect, there is provided a rolling display arrangement for an electronic device, the rolling display arrangement comprising a display module, a shaft module, and at least one transmission module, the transmission module being adapted for transferring rotational movement of the shaft module and the transmission module to linear movement of the display module.

Such a rolling display arrangement allows display module to slide linearly, and hence the size of the display to be changed without folding the display module, and the rotational movement allows a very spatially efficient means of driving the linear movement. Hence, the rolling display arrangement does not add significantly to the depth of the electronic device onto which it is mounted.

The display module comprises a flexible display and a display support, the display support comprising a first rigid part, a second rigid part, and a flexible part arranged between the first rigid part and the second rigid part, the first rigid part and the second rigid part extending in parallel, the flexible part partially enclosing the shaft module, the shaft module comprising a drive shaft and a drive shaft gear, the transmission module being interconnected with the first rigid part and the second rigid part of the display module, and with the drive shaft gear of the shaft module. The parallel configuration allows the flexible display to be securely arranged around the chassis module such that it is not damaged, e.g., during transportation. Furthermore, the combination of flexible and rigid parts provides enough support to the flexible display while still allowing it to be wrapped around the device chassis without deforming permanently.

The transmission module comprises a drive belt, a transmission gear arrangement driving the drive belt, a first display clamp, and a second display clamp being arranged on the drive belt, the first display clamp being interconnected with the first rigid part of the display support, the second display clamp being interconnected with the second rigid part of the display support, facilitating a simple, synchronized, and spatially efficient means of driving the display module.

In a further possible implementation form of the first aspect, the drive belt is arranged between, and extends substantially in parallel with, the first rigid part and the second rigid part of the display support.

In a further possible implementation form of the first aspect, the transmission gear arrangement comprises a drive belt gear driving the drive belt and a synchronizing gear meshing with the drive shaft gear of the shaft module, the drive belt gear and the synchronizing gear sharing a first center axis, allowing the upper and lower edges of the flexible display to move synchronously.

In a further possible implementation form of the first aspect, the first display clamp and the second display clamp of the transmission module each comprise a protrusion extending from the drive belt, the first rigid part and the second rigid part of the display support each comprise a recess for accommodating the protrusion, allowing the flexible display to be moved without any distortion arising between the upper and lower edges of the flexible display and hence avoiding the flexible display getting an unaesthetic appearance and/or getting stuck during movement.

In a further possible implementation form of the first aspect, the shaft module further comprises a freely rotatable outer shaft and a stationary center shaft, the outer shaft, the drive shaft, and the center shaft sharing a second center axis, the drive shaft being arranged between the outer shaft and the center shaft, and the outer shaft being in abutment with the flexible part of the display support, providing a spatially efficient driving means and hence leaving more room, within the electronic device, for other components such as batteries.

In a further possible implementation form of the first aspect, the outer shaft rotates in response to the linear movement of the display module, the outer shaft acting as a bearing as it reduces the friction as the display module is moving.

In a further possible implementation form of the first aspect, the outer shaft comprises a helix-shaped cut extending through the wall of the outer shaft, in the direction of the second center axis, facilitating the assembly of the shaft module.

In a further possible implementation form of the first aspect, counterclockwise rotational movement of the drive shaft is transferred to linear movement of the first rigid part in a first direction, clockwise rotational movement of the drive shaft is transferred to linear movement of the first rigid part in a second direction, the second direction being opposite to the first direction, and simultaneously the counterclockwise rotational movement of the drive shaft is transferred to linear movement of the second rigid part in the second direction, and the clockwise rotational movement of the drive shaft is transferred to linear movement of the second rigid part in the first direction. This solution facilitates a rolling display arrangement which is both simple and aesthetically pleasing, since all driving components are covered by the display module.

In a further possible implementation form of the first aspect, the linear movement is perpendicular to the second center axis.

In a further possible implementation form of the first aspect, the rolling display arrangement further comprises an electric motor, a motor gear of the electric motor meshing with the synchronizing gear of the transmission module, the electric motor effectuating the rotational movement of the shaft module and the transmission module. This facilitates electronic drive of the rolling display arrangement.

According to a second aspect, there is provided an electronic device comprising a chassis module, two end cap modules arranged at opposite short sides of the chassis module, and a rolling display arrangement according to the above, the rolling display arrangement partially enclosing the chassis module, the rolling display arrangement being interlocked with the chassis module by means of the end cap modules, the shaft module of the rolling display arrangement extending adjacent a long side of the chassis module between the end cap modules, each transmission module of the rolling display arrangement extending between the short side of the chassis module and the end cap. The enclosing configuration allows the rolling display arrangement to be securely arranged around the chassis module such that it is not damaged, e.g., during transportation.

In a possible implementation form of the second aspect, the first rigid part of the display module extends adjacent a first main side of the chassis module, and the second rigid part of the display module extends adjacent a second, opposite main side of the chassis module, the flexible part extending from the first main side to the second main side, the combination of flexible and rigid parts providing enough support to the flexible display while still allowing it to be wrapped around the chassis module without deforming permanently.

In a further possible implementation form of the second aspect, the electronic device further comprises a spring module arranged between the first main side of the chassis module and the display module, the spring module comprising a spring support and a tension spring, a first end of the tension spring being connected to the spring support, adjacent the end cap module, and a second end of the tension spring being connected to the first rigid part of the display module, the second end of the tension spring being moved in the first direction and in the second direction of linear movement along with the first rigid part. The spring module helps tightening the flexible display and rolling in/out the rolling display arrangement.

In a further possible implementation form of the second aspect, the end cap module is releasably interconnected with the stationary center shaft of the shaft module.

In a further possible implementation form of the second aspect, the rolling display arrangement is in one of a retracted position and an extended position, the display module covering the first main side of the chassis module, and the display module covering a part of the second main side of the chassis module, the second main side being opposite to the first main side of the chassis module, when the rolling display arrangement is in the retracted position, the display module protruding past the first main side of the chassis module, and the display module covering a part of the second main side of the chassis module which is smaller than the corresponding part in the retracted position, when the rolling display arrangement is in the extended position. Such an electronic device comprises a display module which slides linearly, and hence the size of the display changes without folding the display module, and the rotational movement allows a very spatially efficient means of driving the linear movement.

In a further possible implementation form of the second aspect, in the retracted position, the first main side of the chassis module is fully covered by the first rigid part, and the second main side of the chassis module is fully covered by the second rigid part and a part of the flexible part, and, in the extended position, the first main side of the chassis module is fully covered by the first rigid part and a part of the flexible part, and the second main side of the chassis module is partially covered by the second rigid part, allowing the flexible display to be as small, or as large, as possible, according to the wish of the user.

In a further possible implementation form of the second aspect, the rolling display arrangement is moved to an extended position when counterclockwise rotational movement of the drive shaft is transferred to linear movement of the first rigid part in a first direction and to linear movement of the second rigid part in a second, opposite direction, and wherein the rolling display arrangement is moved to a retracted position when clockwise rotational movement of the drive shaft is transferred to linear movement of the first rigid part in the second direction, and to linear movement of the second rigid part in the first direction.

This and other aspects will be apparent from and the embodiments described below.

<FIG> shows an electronic device <NUM> comprising a chassis module <NUM>. The chassis module has two oppositely arranged short sides 22a and two oppositely arranged long sides 22b, the long sides 22b extending perpendicular to the short sides 22a. The short sides 22a and the long sides 22b form the edge area of the electronic device <NUM>. The chassis module <NUM> furthermore has two oppositely arranged main surfaces, the first main side 22c and the second main side 22d, which extend substantially perpendicular to both the short sides 22a and the long sides 22b.

The electronic device further comprises two end cap modules <NUM> arranged at opposite short sides 22a of the chassis module <NUM>, and a rolling display arrangement <NUM> described in more detail below. The rolling display arrangement <NUM> partially encloses the chassis module <NUM>, for example being adapted for covering one long side 22b, the first main side 22c, and the second main side 22d of the chassis module <NUM>. The remaining long side 22b is not covered by the rolling display arrangement <NUM>, regardless of the position of the rolling display arrangement <NUM>. The rolling display arrangement <NUM> is interlocked with the chassis module <NUM> by means of the end cap modules <NUM>, which are arranged adjacent the short sides 22a of the chassis module <NUM>. In an exemplifying configuration, each end cap module <NUM> comprises an end cap and one or more screws, for example <NUM> screws. The end of the end cap which is closest to the covered long side 22b is connected to the rolling display arrangement <NUM> by means of one screw. Correspondingly, the opposite end of the end cap, i.e. the end which is closest to the non-covered long side 22b is connected to the chassis module <NUM> by means of one screw.

The rolling display arrangement <NUM> may be in a retracted position P1 or an extended position P2. In the extended position P2, the electronic device <NUM> has one large visible display extending farther to one side than the chassis module. In the retracted position P1, only a part of the large visible display extends along the front of the electronic device <NUM>, i.e. adjacent the first main surface 22c of the chassis module <NUM>, and the rest of the large visible display is folded around one long side 22b of the chassis module and along the back of the electronic device <NUM>, i.e. adjacent the second main surface 22d of the chassis module <NUM>. This allows the user to use a full-size display when, e.g., viewing video and to use a smaller display when using the device as a phone or during transport.

The chassis module <NUM> comprises the internal components of the electronic device, such as battery, main board, integrated circuits, processors, memory, cameras, speakers, flexible circuit boards and cables.

The rolling display arrangement <NUM> comprises, as shown in <FIG>, a display module <NUM>, a shaft module <NUM>, and at least one, in an illustrative example two, transmission modules <NUM>. The transmission module <NUM> is adapted for transferring rotational movement of the shaft module <NUM> and the transmission module <NUM> to linear movement of the display module <NUM>. Each transmission module <NUM> extends between one short side 22a of the chassis module <NUM> and one end cap module.

The shaft module <NUM> of the rolling display arrangement <NUM> extends adjacent the covered long side 22b of the chassis module <NUM> and between the end cap modules <NUM>, and the flexible part 7c partially encloses the shaft module <NUM>, i.e. the shaft module <NUM> is enclosed along its center axis, i.e. second center axis A2, while the opposite ends of the shaft module <NUM> are non-covered. The above-mentioned linear movement may be perpendicular to the second center axis A2. The shaft module <NUM> will be described in more detail further below.

The display module <NUM> comprises a display support <NUM> and a flexible display <NUM>, as shown in <FIG>. The flexible display <NUM> will be described in more detail further below. The display module <NUM> is pre-assembled, as a sub-assembly, and subsequently slid onto the chassis module <NUM>, and fixed into place by means of the end cap modules <NUM>. The short sides 22a of the chassis module <NUM> and the inside of the end cap modules <NUM> form a groove in which the edge of the display module <NUM> fits and is maintained into place.

The display support <NUM> comprises a first rigid part 7a, a second rigid part 7b, and a flexible part 7c arranged between the first rigid part 7a and the second rigid part 7b, as shown in <FIG>. The display module <NUM> is adapted for folding such that the first rigid part 7a and the second rigid part 7b extend in parallel, as the rolling display arrangement <NUM> encloses the chassis module <NUM>. The first rigid part 7a of the display module <NUM> extends adjacent a first main side 22c of the chassis module <NUM>, and the second rigid part 7b of the display module <NUM> extends adjacent a second, opposite main side 22d of the chassis module <NUM>. The flexible part 7c extends from the first main side 22c to the second main side 22d.

The first rigid part 7a and/or the second rigid part 7b may include metal or may be made of metal. The flexible part 7c of the display module <NUM> may comprise of an elastomer layer <NUM> and a corrugated metal layer <NUM> superimposed onto each other, as shown in <FIG>, for example co-moulded together. When the display module <NUM> is mounted onto the chassis module <NUM>, the flexible part 7c is folded such that the corrugated metal layer <NUM> faces the interior of the display module <NUM>, and the corrugated metal layer <NUM> faces at least one of the first rigid part 7a and the second rigid part 7b. The elastomer layer <NUM> has at least one planar surface, allowing the flexible display <NUM> to be adhered to the planar surface of the elastomer layer <NUM>, for example by means of an adhesive layer <NUM>. The opposite surface of the elastomer layer <NUM> is for example corrugated as well, such that the ridges of the elastomer layer <NUM> fill the valleys of the corrugated metal layer <NUM>. The corrugation adds stiffness in a direction perpendicular to the surface of the flexible part 7c, while still being flexible in the direction of linear movement.

The display module <NUM> encloses the chassis module <NUM> such that the first rigid part 7a of the display module <NUM> extends adjacent the first main side 22c of the chassis module <NUM>, and the second rigid part 7b of the display module <NUM> extends adjacent the second, opposite main side 22d of the chassis module <NUM>. Hence, the flexible part 7c of the display module <NUM> extends from the first main side 22c to the second main side 22d.

The display support <NUM> may comprises at least one lubricating layer <NUM>, applied onto at least one of the first rigid part 7a and the corrugated metal layer <NUM>, as shown in <FIG>. The lubricating layer <NUM> is made from POM-material or any other suitable lubricated material, and it minimizes the amount of friction and allows the display module <NUM> to slide smoothly.

In one embodiment, the display support <NUM> comprises two reinforcement bars <NUM> extending along a first edge and a second opposite edge of the display support <NUM>. Each end cap module <NUM> comprises a corresponding groove <NUM> adapted for accommodating the reinforcement bar <NUM>, as shown in <FIG>.

As mentioned above, the transmission module <NUM> is adapted for transferring rotational movement of the shaft module <NUM> and the transmission module <NUM> to linear movement of the display module <NUM>. The linear movement is executed in a first direction D1 and a second, opposite direction D2. As shown in <FIG>, the rolling display arrangement <NUM> may be in one of a retracted position P1 and an extended position P2. When the rolling display arrangement <NUM> is in the retracted position P1, the display module <NUM> covers the first main side 22c of the chassis module <NUM>, and the display module <NUM> also covers a part of the second main side 22d of the chassis module <NUM>. When the rolling display arrangement <NUM> is in the extended position P2, the display module <NUM> protrudes past the first main side 22c of the chassis module <NUM>, past the non-covered long side 22b, and the display module <NUM> also covers a part of the second main side 22d of the chassis module <NUM> which is smaller than the corresponding part in the retracted position P1.

As shown in <FIG> and <FIG>, the shaft module <NUM> comprises a drive shaft <NUM> and a drive shaft gear <NUM> arranged at each end of the drive shaft <NUM>. The shaft module <NUM> may further comprise a freely rotatable outer shaft <NUM> and a stationary center shaft <NUM>, the outer shaft <NUM>, the drive shaft <NUM>, and the center shaft <NUM> sharing a second center axis A2. The drive shaft <NUM> is arranged between the outer shaft <NUM> and the center shaft <NUM>, and the outer shaft <NUM> is in abutment with the flexible part 7c of the display support <NUM>. The freely rotatable outer shaft <NUM> rotates in response to the linear movement of the display module <NUM>, acting as a bearing as it reduces the friction when the display support <NUM> is moving. The outer shaft <NUM> is made of POM material, a self-lubricating plastic. When the display module <NUM> rolls around the outer shaft <NUM>, it has to be deformed, and its linear movement becomes rotational movement. At this time, force and friction, applied onto the display module <NUM>, are at their largest. The design of the outer shaft <NUM> and the use of self-lubricating material minimizes the amount of friction and allows the display module <NUM> to slide smoothly.

In one embodiment, shown in <FIG>, the outer shaft <NUM> comprises a helix-shaped cut <NUM> which extends through the wall of the outer shaft <NUM>, in a helix shape, in the direction of the second center axis A2. This allows the outer shaft <NUM> to be expanded during assembly of the shaft module <NUM>, facilitating arranging the outer shaft <NUM> around the drive shaft <NUM>.

In one embodiment, each end cap module <NUM> is releasably interconnected with the stationary center shaft <NUM> of the shaft module <NUM>, as shown in <FIG>.

The transmission module <NUM> may be interconnected with the first rigid part 7a and the second rigid part 7b of the display module <NUM>, and with the drive shaft gear <NUM> of the shaft module <NUM>. As shown in <FIG>, the transmission module <NUM> comprises a drive belt <NUM>, a transmission gear arrangement <NUM> driving the drive belt <NUM>, a first display clamp 12a, and a second display clamp 12b being arranged on the drive belt <NUM>.

The transmission gear arrangement <NUM> comprises a drive belt gear <NUM>, driving the drive belt <NUM>, and a synchronizing gear <NUM> meshing with the drive shaft gear <NUM> of the shaft module <NUM> The drive belt gear <NUM> and the synchronizing gear <NUM> share a further center axis, i.e. first center axis A1, as shown in <FIG>, <FIG>, and <FIG>.

As shown in <FIG>, the drive belt <NUM> is arranged between, and extends substantially in parallel with, the first rigid part 7a and the second rigid part 7b of the display support <NUM>.

The first display clamp 12a is interconnected with the first rigid part 7a of the display support <NUM>, and the second display clamp 12b is interconnected with the second rigid part 7b of the display support <NUM>. In one embodiment, the first display clamp 12a and the second display clamp 12b each comprise a protrusion <NUM> extending from the drive belt <NUM>, and the first rigid part 7a and the second rigid part 7b of the display support <NUM> each comprise a recess <NUM> for accommodating the protrusion <NUM>, as shown in <FIG>.

A drive shaft gear <NUM> and a transmission gear arrangement <NUM> engages, at both sides of the drive shaft <NUM>, synchronizing the drive of both drive belts <NUM>.

A counterclockwise rotational movement of the drive shaft <NUM> is transferred to linear movement of the first rigid part 7a in a first direction D1, as shown in <FIG> and <FIG>, and simultaneously to linear movement of the second rigid part 7b in the second direction D2, the second direction D2 being opposite to the first direction D1. Correspondingly, a clockwise rotational movement of the drive shaft <NUM> is transferred to linear movement of the first rigid part 7a in the second direction D2, and to linear movement of the second rigid part 7b in the first direction D1.

In the retracted position P1, shown in <FIG>, <FIG>, and <FIG>, the first main side 22c of the chassis module <NUM> is fully covered by the first rigid part 7a, and the second main side 22d of the chassis module <NUM> is fully covered by the second rigid part 7b and a part of the flexible part 7c. In the extended position P2, shown in <FIG>, <FIG>, <FIG>, and <FIG>, the first main side 22c of the chassis module <NUM> is fully covered by the first rigid part 7a and a part of the flexible part 7c, and the second main side 22d of the chassis module <NUM> is partially covered by the second rigid part 7b.

The rolling display arrangement <NUM> is moved to the extended position P2 when counterclockwise rotational movement of the drive shaft <NUM> is transferred to linear movement of the first rigid part 7a in the first direction D1 and to linear movement of the second rigid part 7b in a second, opposite direction. Correspondingly, the rolling display arrangement <NUM> is moved to a retracted position P1 when clockwise rotational movement of the drive shaft <NUM> is transferred to linear movement of the first rigid part 7a in the second direction D2, and to linear movement of the second rigid part 7b in the first direction D1.

In one embodiment, the electronic device <NUM> comprises a spring module <NUM> arranged between the first main side 22c of the chassis module <NUM> and the display module <NUM>. As shown in <FIG>, the spring module <NUM> comprises a spring support 24a as shown in <FIG> and a tension spring 24b. A first end of the tension spring 24b is connected to the spring support 24a, adjacent the end cap module <NUM>, and the second, opposite end of the tension spring 24b is connected to the first rigid part 7a of the display module <NUM>. The second end of the tension spring 24b is moved in the first direction D1 and in the second direction D2 of linear movement along with the first rigid part 7a.

The main function of the tension spring 24b is to help tightening the flexible display <NUM> and rolling in/out the rolling display arrangement <NUM>. The tension spring 24b changes form as the rolling display arrangement <NUM> moves. When the rolling display arrangement <NUM> is moved to the retracted position P1, the spring force ensures that the flexible display <NUM> is tightened and does not slide out. When the rolling display arrangement <NUM> is moved to the expanded position P2, the spring force holds the flexible display <NUM>, such that it does not shrink arbitrarily without any external force.

The rolling display arrangement <NUM> may be operated manually. However, the rolling display arrangement <NUM> may also be operated electronically. In one embodiment, the rolling display arrangement <NUM> comprises an electric motor <NUM>, shown in <FIG>. A motor gear <NUM> of the electric motor <NUM> meshes with the synchronizing gear <NUM> of the transmission module <NUM>, such that the electric motor <NUM> effectuates the rotational movement of both the shaft module <NUM> and the transmission module <NUM>. The electric motor <NUM> is connected with a sub printed circuit board assembly (PCBA) by means of <NUM> pads. A key for operating the electric motor <NUM> has to be added to the electronic device <NUM>, as shown in <FIG>.

As mentioned above, the display module <NUM> comprises a display support <NUM> and a flexible display <NUM>, shown in <FIG>. The flexible display <NUM> comprises a covering structure <NUM> comprising a cover layer <NUM> and a polarizing layer <NUM>, and a displaying structure <NUM> adhered to the covering structure <NUM> by means of a first adhesive layer 34a. The displaying structure <NUM> comprises a plurality of layers, at least one layer for example an OLED panel layer <NUM> or AMOLED panel layer <NUM>.

The cover layer <NUM> and the polarizing layer <NUM> may comprise at least partially of polymer material, for example polyimide. In one embodiment, the cover layer <NUM> comprises completely of polymer material. The polarizing layer may comprise only one material, for example a liquid crystal polymer material. In a further embodiment, the polarizing layer <NUM> comprises of two sub-layers coated onto each other, one sub-layer of polymer material and one sub-layer comprising a polarizer coated directly onto the polymer material sub-layer. This eliminates the need for additional adhesive or support layers within the flexible display <NUM>. The polarizer may be a circular polarizer, e.g., comprising of a linear polarizer and a quarter wave plate. The two sub-layers may be coated as separate layers and comprise of the same base material but having different polymer molecule orientation. Other solutions are however conceivable.

The displaying structure <NUM> may comprises a touch sensor, located within a panel layer <NUM> (not shown). The displaying structure <NUM> may comprise a touch sensor layer <NUM> and a second adhesive layer 34b, the second adhesive layer 34b attaching the touch sensor layer <NUM> to the panel layer <NUM>. The second adhesive layer 34b for example a pressure sensitive adhesive. The polarizing layer <NUM> may be arranged between the cover layer <NUM> and the touch sensor layer <NUM>.

In a further embodiment, the cover layer <NUM> comprises a plurality of sub-layers being attached to each other by a third adhesive layer 34c, in which case the polarizing layer <NUM> is coated directly onto one of the sub-layers (not shown).

Regardless of the location of the polarizing layer, the polarizing layer <NUM> may be coated directly onto an adjacent layer, i.e. the polarizing layer <NUM> may be coated directly onto a peripheral layer of the displaying structure <NUM> or coated directly onto one of the layers of the covering structure <NUM>.

In one embodiment, the covering structure <NUM> comprises a hard coating <NUM> adhered to the cover layer <NUM>.

Claim 1:
A rolling display arrangement (<NUM>) for an electronic device (<NUM>), said rolling display arrangement (<NUM>) comprising:
- a display module (<NUM>),
- a shaft module (<NUM>), and
- at least one transmission module (<NUM>),
said transmission module (<NUM>) being adapted for transferring rotational movement of said shaft module (<NUM>) and said transmission module (<NUM>) to linear movement of said display module (<NUM>),
said display module (<NUM>) comprises a flexible display (<NUM>) and a display support (<NUM>), said display support (<NUM>) comprising a first rigid part (7a), a second rigid part (7b), and a flexible part (7c) arranged between said first rigid part (7a) and said second rigid part (7b), said first rigid part (7a) and said second rigid part (7b) extending in parallel,
said flexible part (7c) partially enclosing said shaft module (<NUM>),
said shaft module (<NUM>) comprises a drive shaft (<NUM>) and a drive shaft gear (<NUM>), said transmission module (<NUM>) being interconnected with said first rigid part (7a) and said second rigid part (7b) of said display module (<NUM>), and with said drive shaft gear (<NUM>) of said shaft module (<NUM>), and
said transmission module (<NUM>) comprises a drive belt (<NUM>), a transmission gear arrangement (<NUM>) driving said drive belt (<NUM>), a first display clamp (12a), and a second display clamp (12b) being arranged on said drive belt (<NUM>), said first display clamp (12a) being interconnected with said first rigid part (7a) of said display support (<NUM>), said second display clamp (12b) being interconnected with said second rigid part (7b) of said display support (<NUM>).