WO2006129223A1 - Ecran souple - Google Patents

Ecran souple Download PDF

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Publication number
WO2006129223A1
WO2006129223A1 PCT/IB2006/051607 IB2006051607W WO2006129223A1 WO 2006129223 A1 WO2006129223 A1 WO 2006129223A1 IB 2006051607 W IB2006051607 W IB 2006051607W WO 2006129223 A1 WO2006129223 A1 WO 2006129223A1
Authority
WO
WIPO (PCT)
Prior art keywords
display device
flexible display
electro
substrate
optical switching
Prior art date
Application number
PCT/IB2006/051607
Other languages
English (en)
Inventor
Martijn Krans
Murray F. Gillies
Edzer Huitema
Sima Asvadi
Albert H. J. Immink
Johannes T. A. Wilderbeek
Alexander U. Douglas
Jacqueline Van Driel
Eduard J. Hultermans
Michel P. B. Van Bruggen
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006129223A1 publication Critical patent/WO2006129223A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • 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
    • H10K59/10—OLED displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates

Definitions

  • the present invention relates to a flexible display device comprising a flexible substrate accommodating a plurality of electro-optical switching elements.
  • the present invention also relates to a method for the manufacture of such a flexible display device.
  • the display device comprises a flexible substrate and a plurality of pixels arranged in a form of rows and columns on the surface of the substrate.
  • a plurality of parallel grooves in the surface of the substrate, where each groove is formed in between adjacent two rows or columns of the display pixels.
  • the grooves serve to decrease the propagation of mechanical stress caused when the display device is bent or rolled.
  • US2004124763 is that it is only flexible in one dimension due to the layout and nature of the grooves.
  • Other known flexible display devices also exhibit similar drawbacks. For example a flexible display device where two flexible plastic substrates are used with the pixels or electro-optical switching elements in between, buckling can occur when the display is bent in two dimensions at the same time, which in turn can cause local defects in the display. In other words, these display devices are reliable rather then flexible in a more general sense.
  • a flexible display device comprising a flexible substrate, and a plurality of electro-optical switching elements accommodated on the substrate, whereby the substrate has a plurality of through openings being arranged in a repetitive pattern so that the electro-optical switching elements are located in areas of the substrate adjacent to the openings.
  • the openings are arranged in a grid pattern, i.e. in a network of uniformly spaced horizontal and perpendicular lines.
  • the through openings allow for bending the display device in two directions simultaneously, with reduced tensile or compressive stress in the plane of the substrate.
  • at least one opening has essentially equal extension in two perpendicular directions in the plane of the substrate, forming two main extensions.
  • the at least one opening preferably has a smaller extension compared to the main extension in a direction between said two perpendicular directions.
  • the opening can for example be formed like a cross.
  • the openings are uniformly aligned, i.e. all openings are in the oriented in the same direction.
  • each opening is preferably so arranged that its two main extensions are aligned with the grid pattern.
  • the direction of the first main extension can be parallel to the horizontal lines of the grid pattern and the second main extension can be parallel to the perpendicular lines of the grid pattern. This allows for increased flexibility of the display device.
  • the openings can define a plurality of first areas of the substrate, each of which can accommodate at least one electro-optical switching element or part of a electro- optical switching element, and a plurality of second areas having no electro-optical switching element(s), which second areas connect adjacent first areas.
  • the bending action is concentrated to the second connection areas.
  • a bending moment of the display device will cause a bending moment mainly along connection areas rather than through a first switching element area.
  • conducting lines for electrically connecting the electro-optical switching elements can be guided via the second areas.
  • a stiffening plate can further be attached at each first area, whereby the size of the stiffening plate essentially corresponding to the size of the first area.
  • the stiffening plates can for example be placed on the opposite side of the substrate in relation to the electro- optical switching elements, so that the plats do not disrupt any emission of light from the switching elements.
  • the stiffening plates make it possible to provide a very flexible display device even if the electro-optical switching elements themselves are not flexible.
  • the bending action of the substrate is concentrated to the connections areas connection each first area accommodating electro-optical switching element(s).
  • the substrate of the flexible display device can be made of plastic sheets, such as thin film plastic sheets.
  • the electro-optical switching elements of the flexible display device according to the invention can be individually addressed.
  • the electro-optical switching elements can be pixels and the flexible display device can be used as a display.
  • the flexible display device according to the invention can be used as a light source.
  • the electro-optical switching elements can for instance be constituted by light emitting diodes (LEDs).
  • the substrate and the electro-optical switching elements of the flexible display device can further be encapsulated by an encapsulation, preferably of an elastomer material, so that the substrate and electro-optical switching elements are completely surrounded by the elastomer material. This protects the substrate and electro-optical switching elements, and enhances the mechanical properties of the display device.
  • the flexible display device can comprise, in particular when used as an emissive display or (LED) light source, a flexible diffusing element being arranged to receive and diffuse light from the electro-optical switching elements.
  • LED emissive display
  • a flexible diffusing element being arranged to receive and diffuse light from the electro-optical switching elements.
  • inorganic LEDs are small point sources of light, and multiple LEDs distributed over the surface of a substrate will not allow the entire substrate to emit light, but just the small fraction of the substrate covered with the source.
  • a diffuser By applying a diffuser, a more uniform out-coupling of light from the substrate surface can be obtained.
  • the diffuser is especially advantageous when the electro-optical switching elements are spaced apart by long flexible connecting area.
  • the diffuser is also advantageous when inorganic LEDs are used, where each LED is surrounded by a conductive area to spread the heat generated by the LED.
  • the diffusing element comprises at least one layer of fabric, and more preferably, the diffusing element comprises at least one layer of non- woven fabric.
  • Non- woven is produced from fibrous web bonded by mechanical entanglement of the fibers or by use of resins, thermal fusion and formation of chemical complexes. The fibers in the web can be arranged in a random or oriented fashion.
  • a non- woven material in essence is a mixture of air and random fibers. Therefore, it contains the two essential elements for diffusion: air and randomness of the fibrous material. Also, it is very flexible, making it especially suitable for an emissive display device with enhanced flexibility.
  • the density of the non- woven fabric cay be lower at a face of the diffusing element facing an electro-optical switching element compared to the density at a face of the diffusing element opposite to the electro-optical switching element.
  • the diffusing element may comprise a first layer of non- woven fabric arranged adjacent to the electro-optical switching elements and a second layer of non- woven fabric arranged on the first layer, where the density of the second layer is higher the density of the first layer.
  • the portion of the diffusing element being located close to the electro-optical switching elements has a low density, and thus provides a spacing between the electro-optical switching elements and the more dense portion of the diffusing element. In this spacing, the cone of light from or emitted by the electro-optical switching elements may expand, before encountering the more dense portion of the diffusing element, where the major part of the light diffusion occurs.
  • the low-density portion also helps keeping the space between the electro-optical switching elements and the denser portion acceptably constant, even if the display device is bended, etc.
  • the denser portion of the diffusing element is to diffuse the light and hence provide homogeneity to the light-containing surface.
  • the diffusing element can for example comprise a foam, a woven fabric, or any other suitable material(s).
  • the display device can further comprise an elastomer layer disposed between the substrate and the diffusing element, for increasing the homogeneity of the display device.
  • a method for the manufacture of a flexible display device which method comprises providing a flexible substrate, providing a plurality of electro-optical switching elements on the substrate, and providing a plurality of through openings in the substrate, which openings are arranged in a repetitive pattern so that the electro-optical switching elements are located in areas of the substrate adjacent to the openings. This method offers similar advantages as obtained with the previously discussed aspect of the invention.
  • the through openings can be achieved by punching by means of a punch.
  • the substrate can comprise an upper and lower plastic sheet, with the electro-optical switching elements positioned between the sheets, whereby the punch during a punching operation can be heated to at least the melting temperature of the sheets, for creating a seal between the sheets at the openings.
  • Hermetical sealing of the optically active area, i.e. the electro-optical switching element is required in many types of display devices, for example displays based on polymer light emitting devices.
  • a textile product comprising a flexible display device.
  • Fig. 1 is a top view of a flexible display device according to an embodiment of the present invention
  • Figs. 2a-2b are top views illustrating alternative shapes of the openings of a flexible display device according to the invention
  • Fig. 3 is a bottom view of a flexible display device according to another embodiment of the present invention.
  • Figs. 4a-4c are perspective views illustrating a method for the manufacture of a flexible display device.
  • Fig. 5 is a side view of a flexible display device including a diffuser according to an embodiment of the present invention.
  • Fig. 1 is a top view of a flexible display device 10 according to an embodiment of the present invention.
  • the display device can for example be a display for displaying messages, images, etc., or a light source.
  • the flexible display device 10 comprises a substrate 12 made of a flexible material.
  • the substrate 12 can for example comprise thin plastic sheets.
  • the substrate 12 further accommodates a plurality of electro-optical switching elements 14.
  • the electro-optical switching element can for example be transmissive, reflective or emissive.
  • An emissive electro-optical switching element can for example be one or more light emitting diodes (LEDs).
  • the openings 16 are cross-shaped.
  • the openings 16 are arranged in a repetitive pattern across the substrate 12.
  • the openings 16 are arranged in a grid pattern, i.e. in a network of uniformly spaced horizontal and perpendicular lines, which is aligned to the edges of the substrate 12.
  • Each opening 16 has equal extension in two perpendicular directions (namely the x and y directions) in the plane of the substrate 12, and a smaller extension in a direction between said two perpendicular directions, as can be seen in fig. 1.
  • the openings 16 in fig. 1 are all equally sized and oriented in the same direction, i.e. uniformly aligned.
  • the openings 16 are aligned with the grid pattern, i.e. the direction of the first main extension (x) is parallel to the horizontal lines of the grid pattern and the second main extension (y) is parallel to the perpendicular lines of the grid pattern.
  • the shape and layout of the openings 16 results in that an array of (first) areas
  • each area 18 corresponds to an integer amount of pixels or sub-pixels, or, in the case of sub- pixels, each pixel contains an integer amount of openings/patterns.
  • the areas 18 are connected to each other by (second) areas 20 of the substrate 12. These connection areas 20 preferably contain no electro-optical switching elements. In fig. 1, each area 18, except areas at the edge of the substrate 12, is connected to adjacent areas 18 accommodating electro-optical switching elements by four connection areas or arms 20. Any conducting lines (not shown) electrically connecting the electro-optical switching elements 14, which conducting lines are used to power and/or address the electro-optical switching elements, should preferably be guided via the connection areas 20.
  • the openings 16 provide for increased flexibility of the substrate 12 and the display device 10.
  • the display device 10 can be bent in two directions at the same time without being damaged. The bending and torsion action will be concentrated to the connection areas 20.
  • both sides of the flexible display device 10 can be coated with a flexible and waterproof material (not shown), such as silicone rubber, polyurethane rubber or certain kinds of epoxy.
  • a flexible and waterproof material such as silicone rubber, polyurethane rubber or certain kinds of epoxy.
  • each opening 16 is formed like a plaquette, defining almost circular areas for accommodating electro-optical switching elements.
  • each opening 16 is formed like a square with rounded corners.
  • each through opening in figs. 2a and 2b has equal extension in two perpendicular directions in the plane of the substrate 12, and a smaller extension in a direction between said two perpendicular directions, resulting in improved flexibility characteristics for the substrate 12 and display device 10.
  • Fig. 3 is a bottom view of a flexible display device according to another embodiment of the present invention.
  • the flexible display device in fig. 3 is similar to the flexible display device in fig. 1, except for the addition of local stiffening plates 22.
  • the stiffening plates 22 are attached on the opposite side of the substrate 12 in relation to the electro-optical switching elements 14. That is, the plates 22 are positioned so that they do not obstruct any light emitted or reflected from the optically active area of the electro-optical switching elements 14.
  • the size of each plate 22 essentially corresponds to the size of the above-mentioned first area 18, as can be seen in fig. 3.
  • the flexing action of the substrate 12 and the display device 10 is concentrated to the connecting areas 20 between the areas 18.
  • the plates 22 are advantageously used in combination with non- flexible electro-optical switching elements, serving as a support to the elements, whereby a flexible display device can be created regardless of the non- flexible elements. Due to the nature of the openings 16, the display device can be bent in two directions at the same time without being damaged.
  • a method for the manufacture of a flexible display device will now be described in relation to figs. 4a-4c.
  • the through openings are preferably created as one of the last steps in the method for the manufacturing of the flexible display device. Therefore, in fig. 4a, a substrate 12 comprising electro-optical switching elements 14, conducting lines (not shown), etc., is provided.
  • the substrate 12 preferably comprises thin plastic sheets.
  • a punch 24 is used to create the through openings in the substrate 12 by punching.
  • the punch 24 has a cross section that corresponds to the desired shape of the through openings to be punched.
  • the punch 24 in fig. 4b is adapted to create one through opening per punching operation. In this case, the punching operation has to be repeated several times for each display device.
  • a punch adapted to create several through openings in one punching operation can be used. In this case, a plurality of through openings or even all through openings can be created in one single punching operation.
  • the final flexible display device 10 comprising a plurality of through openings
  • each electro-optical switching element can be hermetically sealed by locally melting together these sheets at the openings 14. This under the condition that the electro-optical switching element is covered on each side by at least one substrate plastic sheet.
  • the flexible display device 10 can further comprise a diffuser 26 arranged to receive and diffuse light emitted by the electro-optical switching elements 14.
  • the diffuser can advantageously be used when the display device is a light emitting display device.
  • the diffuser is particularly useful when the flexible display device 10 is a pixelated light source and the electro-optical switching elements 14 are constituted by LEDs.
  • the diffuser 26 comprises at least one layer of non- woven fabric.
  • a non- woven fabric diffuser exhibits good diffusing characteristics and is especially suitable for flexible display devices, as the diffuser is made of flexible materials.
  • the light diffuser 26 comprises a first layer of a low-density non- woven fabric facing the electro-optical switching elements 14, and a second layer of a non- woven fabric whose density is higher than that for the first layer.
  • the diffuser can for example comprise a foam, a woven fabric, or any other suitable material(s).
  • a separate elastomer layer 28 can be disposed between the substrate 12 accommodating the electro-optical switching elements 14 and the diffuser 26. Since the electro-optical switching elements 14 may have a certain height, the flexible elastomer layer 28 has openings or holes at the locations of the electro-optical switching elements 14. Incorporating such a elastomer layer 28 gives the display device a more uniform feel, for example when being touched.
  • the flexible substrate 12 and the electro- optical switching elements 14 can be completely surrounded by a coating (not shown), as described in relation to fig. 1 above.
  • the coating can be of an elastomer material. The coating can be achieved for example by immersion.
  • Areas of application for flexible display devices includes, but is not restricted to: pillows, toys such as cuddly toys, mats or carpets, table cloths, garments such as gloves, curtains, furnishing fabrics, vehicle ceilings, bed textiles, and backpacks.
  • Incorporating a flexible display device in such a textile product allows the textile product to become luminous and/or display messages.
  • the flexible display device can be incorporated in a pillow.
  • the pillow can also comprise communication means for receiving data, and means for controlling the output of the display device of the pillow according to the received data.
  • the communication means can for example comprise a GSM-module, whereby a user from a mobile phone can send instructions of when and how to illuminate the pillow and/or send messages, such as SMS messages or MMS messages, to be displayed on the pillow.
  • the nearby Bluetooth device can be used to relay instructions, images, messages, etc. from a remote device to the pillow.
  • the communication means can alternatively comprise a Bluetooth module, whereby a user from a nearby Bluetooth device such as a computer can send instructions of when and how to illuminate the pillow, and/or send images or messages, such as e-mail messages, to be displayed on the pillow.
  • the pillow can further or as an alternative comprise pressure sensor means for detecting pressure on the pillow, which sensor is connected to the control means to allow for touch sensitivity functionality.
  • the flexible display device can in a similar manner be implemented in a (cuddly) toy.
  • the communication means can be used for direct communication between two textile products.
  • the communication means of that first pillow can send data to a second pillow, which data includes instructions of how to control the output of the display device of the second pillow.
  • the flexible display device can be incorporated in a floor mat or carpet or tablecloth.
  • the mat can also comprise pressure sensor means for detecting pressure on the mat, and means for controlling the output of the display device of the mat according to the detected pressure, to allow for touch sensitivity functionality. For instance, a person standing on or touching a particular area of the mat can incur a certain corresponding illumination of the display device of the mat, for example an illumination of that particular area.
  • Such a mat can for example be used in gaming, exercising, measuring weight, etc.
  • the flexible display device can be incorporated in a garment, such as a glove or a jacket sleeve, with the display device connected to a compass.
  • the compass is adapted to detect the current bearing
  • the glove can further comprise means for controlling the output of the display device of the glove according to the detected bearing.
  • the detected bearing can be indicated by a message displayed on the display device and/or by a certain illumination of the display device of the glove. For example each direction can be indicated with a separate color or pattern. This allows for determination of the direction that is being pointed at.
  • the glove could in addition be connected to a GPS (global positioning system) receiver in order to guide the wearer of the clothing in a desired direction.
  • GPS global positioning system
  • the flexible display device can be incorporated in a bag or a backpack, which also can include an audio system, or which is connectable to an audio system.
  • the display device can be linked to the audio system, and displaying for example audio equalizer signals, ambient patterns, song content descriptions, stand-alone images, icons for safety or self-expression or communication, etc.
  • the display device is overlaid by a semi-transparent fabric (for example thin fabric or mesh fabric) allowing the light emerging from the display device to be seen by a viewer.
  • through openings having different shapes could be provided on a single substrate.
  • the openings could occupy a larger area of the substrate than what is shown in the above figures, i.e. there could be more and/or larger openings provided in the substrate.
  • the pattern of the through openings and the pixel patters could be different from each other.
  • the flexible display device according to the invention can accommodate a much larger amount of pixels.

Abstract

La présente invention concerne un écran souple (10) comprenant un substrat souple (12), ainsi qu'une pluralité d'éléments de commutation électro-optiques (14) reçus sur le substrat. Le dispositif est caractérisé en ce que le substrat présente une pluralité d'ouvertures traversantes (16) conçues selon un motif répétitif de sorte que les éléments de commutation électro-optiques sont situés dans des zones du substrat adjacentes aux ouvertures. Les ouvertures traversantes permettent de plier l'écran dans deux directions simultanément, avec une contrainte de tension et de compression réduite dans le plan du substrat.
PCT/IB2006/051607 2005-05-31 2006-05-19 Ecran souple WO2006129223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05104675.3 2005-05-31
EP05104675 2005-05-31

Publications (1)

Publication Number Publication Date
WO2006129223A1 true WO2006129223A1 (fr) 2006-12-07

Family

ID=36946895

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/051607 WO2006129223A1 (fr) 2005-05-31 2006-05-19 Ecran souple

Country Status (3)

Country Link
CN (1) CN101185175A (fr)
TW (1) TW200713654A (fr)
WO (1) WO2006129223A1 (fr)

Cited By (9)

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WO2007141720A1 (fr) * 2006-06-07 2007-12-13 Koninklijke Philips Electronics N.V. Dispositif lumineux et méthode de fabrication d'un dispositif lumineux
WO2008075277A1 (fr) * 2006-12-21 2008-06-26 Koninklijke Philips Electronics N.V. Substrat flexible pour dispositifs d'affichage
WO2008120134A1 (fr) * 2007-03-29 2008-10-09 Koninklijke Philips Electronics N.V. Dispositif électroluminescent comprenant une couche élastomère
EP2814074A1 (fr) * 2013-05-28 2014-12-17 LG Display Co., Ltd. Dispositif d'affichage flexible et son procédé de fabrication
WO2017031153A1 (fr) * 2015-08-20 2017-02-23 Oletquin Management Llc Articles à base de tissu pourvus de réseaux d'éléments électriques
EP3223327A1 (fr) * 2016-03-22 2017-09-27 Samsung Display Co., Ltd. Afficheur
RU2638985C2 (ru) * 2013-08-21 2017-12-19 Филипс Лайтинг Холдинг Б.В. Ткань с имеющей кремнийорганическую основу оптикой
US10910315B2 (en) 2015-08-20 2021-02-02 Apple Inc. Fabric with embedded electrical components
US11545535B2 (en) 2019-03-25 2023-01-03 Beijing Boe Technology Development Co., Ltd. Stretchable display panel and display device

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KR101975188B1 (ko) * 2018-06-28 2019-05-07 엘지디스플레이 주식회사 표시 장치
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