WO2003067564A1 - Compact display assembly - Google Patents

Compact display assembly Download PDF

Info

Publication number
WO2003067564A1
WO2003067564A1 PCT/AU2002/001170 AU0201170W WO03067564A1 WO 2003067564 A1 WO2003067564 A1 WO 2003067564A1 AU 0201170 W AU0201170 W AU 0201170W WO 03067564 A1 WO03067564 A1 WO 03067564A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
assembly according
flexible
display
printed circuit
Prior art date
Application number
PCT/AU2002/001170
Other languages
French (fr)
Inventor
Kia Silverbrook
Original Assignee
Silverbrook Research Pty. 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 Silverbrook Research Pty. Ltd. filed Critical Silverbrook Research Pty. Ltd.
Priority to EP02759894A priority Critical patent/EP1479060A4/en
Priority to AU2002325641A priority patent/AU2002325641B2/en
Priority to US10/502,577 priority patent/US7128269B2/en
Priority to JP2003566836A priority patent/JP4209333B2/en
Publication of WO2003067564A1 publication Critical patent/WO2003067564A1/en
Priority to IL163157A priority patent/IL163157A/en
Priority to US11/483,061 priority patent/US7777856B2/en

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Classifications

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    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
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    • G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F2221/2129—Authenticate client device independently of the user
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0281—Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/14—Structural association of two or more printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of a flexible or folded printed circuit

Definitions

  • the present invention relates to a compact display assembly.
  • the invention relates to a display assembly incorporating a liquid crystal display (LCD) though other displays, such as an organic light emitting diode (OLED) display might also be used.
  • LCD liquid crystal display
  • OLED organic light emitting diode
  • OLED displays are made according to a multi-layer process by which an extremely thin polymer layer is sandwiched between two electrodes. A few layers of atoms from an indium-tin-oxide (ITO) transparent electric conductor are sputtered on transparent, flexible carrier films to form an anode. The anode is spin-coated with a very thin layer of electroluminiscent polymers. Centrifugal forces distribute the polymers, liquefied by solvents, in an absolutely uniform manner. In a final step a mechanically flexible cathode, being a combination of various metals, is sputtered on the component. The final product is flexible and less than 500nm in thickness.
  • ITO indium-tin-oxide
  • a display assembly which incorporates a flexible display and which is arranged so that the display may be folded or curved over on itself without creasing.
  • a display assembly including: a flexible display screen having a plurality of connection points; at least two printed circuit boards located at the rear of said screen and defining a longitudinal region of the screen therebetween; and flexible connectors between connection points located in said region and each of the printed circuit boards; wherein the flexible connectors are of sufficient length to accommodate closing of the assembly about the longitudinal region.
  • the flexible connectors may comprise looms of wires. It is preferred that the printed circuit boards connect to the looms of wires by means of tape automated bonding films.
  • the screen will be rectangular in shape with an edge of the screen and edges of the PCBs defining triangles and the flexible connectors terminating along edges of the triangles.
  • said edge of the screen and edges of the PCBs define right triangles with the flexible connectors terminating along hypotenuses of the triangles.
  • the printed circuit boards are shaped so that the sum of the lengths of the hypotenuses is equal to said length of the display screen.
  • the flexible connectors may terminate along edges of the printed circuit board defining the longitudinal region of the screen.
  • the screen comprises a flexible liquid crystal display.
  • the screen may comprise an organic light emitting diode display.
  • the display assembly may be incorporated into a computational device, for example a laptop computer or electronic book.
  • Figure 1 is plan view of the front of a prior art display assembly.
  • Figure 2 is a plan view of the rear of a prior art display assembly.
  • Figure 3 is a plan view of the front of a display.
  • Figure 4 is a plan view of the rear of a display assembly according to an embodiment of the present invention.
  • Figure 5 is a perspective view of an assembly according to an embodiment of the present invention in a compact configuration.
  • Figure 6 is a plan view of an assembly according to an embodiment of the present invention in a display configuration.
  • Figure 7 is a plan view of the rear of a display assembly according to a further embodiment of the present invention in a compact configuration.
  • FIG. 1 A schematic view of a typical prior art passive matrix display assembly 10 is shown in Figure 1.
  • the liquid crystal display 12 is designed to display dot pattern images.
  • a plurality of row and column electrodes are horizontally and vertically disposed across the liquid crystal display. Connection points for the electrodes are located along edges of the liquid crystal display.
  • Circuit boards 14 and 18 are coupled to the row and column electrodes of the LCD by means of tape automated bonding (TAB) films 22 and 24.
  • PCB's 14 and 18 support circuitry including a row driver chip and column driver chip, 26 and 28 respectively, for applying potentials to selected row and column electrodes in order to selectively activate liquid crystal cells to form a display.
  • the printed circuit boards 18 and 14 may be folded back behind the screen as shown in Figure 2 which is a rear view of the display assembly.
  • Figure 3 depicts a flexible LCD screen 30 including TAB connections 32 and 34 for connecting to display row electrodes.
  • TAB strips 36 and 38 Beneath the lower edges of the flexible LCD 30 there are located two angled TAB strips 36 and 38. Connection points on each of the angled TAB strips are connected to column electrodes of the LCD display by means of flexible wire looms 40 and 42 respectively. It may be noted that in the presently described embodiment, the distance LI along the TAB strip 36 is equal to the distance LI along the column electrodes to which it is connected by wire loom 42. Accordingly the distance between the column electrodes is maintained as the distance between contacts on the TAB strip which may be desirable in some circumstances.
  • Figure 4 shows a rear view of the display of Figure 3 with PCBs 44 and 46 attached to the folded over TAB strips 32-38. It will be noted that there is sufficient width in the longitudinal region of the screen, defined by edges A- A' and B-B', of the PCBs for the display to be curved or folded on itself without creasing.
  • the bottom edge 41 of screen 30 along with edge A-A' of PCB 46 and TAB film 38 define a right triangle 39.
  • triangle 37 is defined by edge B-B' of PCB 44 and TAB film 36.
  • the display assembly is shown curved upon itself to a compact configuration in Figure 5.
  • the wires connecting column electrode connection points in the region between lines A-A' and B-B' (Fig. 3) to TAB strips 36 and 38 tighten. Accordingly a degree of slack must be present in those wires of looms 40 and 42 when the assembly is in an open configuration as shown in Figure 6.
  • Computational devices such as laptop computers, electronic books and the like may be designed with a hinged or otherwise folding housing to incorporate the display assembly thereby facilitating formation of a compact device.
  • Figure 7 shows the rear of a display assembly in which the PCBs 54 and 56 do not project from the bottom of the screen. Rather column electrode connection points 52 in the region between A-A' and B- B' are connected to connection points 60 and 62 on the inner edges of PCBs 54 and 56 by flexible connectors 58.
  • connection between the electrode contacts and the angled TAB films 38, 36 might be made by means other than wire looms.
  • a flexible film having conductive traces upon it might be used to make the connections.
  • the preferred embodiment has two printed circuit board defining a longitudinal flexing region of the screen it would also be possible to construct embodiments of the invention with other numbers of circuit boards.

Abstract

A compact display assembly includes a flexible display screen such as a passive LCD screen or an OLED display screen. Printed circuit boards including driving circuitry for the display screen are mounted at its rear in a configuration defining a longitudinal region of the screen about which it may be folded or curved over on itself to a compact configuration. The assembly may be included in electronic computational devices such as laptop computers, electronic books and the like.

Description

COMPACT DISPLAY ASSEMBLY
FIELD OF THE INVENTION
The present invention relates to a compact display assembly. In a particular embodiment the invention relates to a display assembly incorporating a liquid crystal display (LCD) though other displays, such as an organic light emitting diode (OLED) display might also be used.
DESCRIPTION OF RELATED ART It is now possible to obtain LCD devices having substrates made of a flexible plate, for example a plastic film. Such devices may be mounted on non-planar surfaces. One such LCD is described in U.S. Pat. No. 4,674,840 to Bennett. More recently, another flexible LCD device has been described in U.S. Pat. No. 6,204,902 to Kim et al.
Considerable research is presently being undertaken in relation to the development of OLED displays. OLED displays are made according to a multi-layer process by which an extremely thin polymer layer is sandwiched between two electrodes. A few layers of atoms from an indium-tin-oxide (ITO) transparent electric conductor are sputtered on transparent, flexible carrier films to form an anode. The anode is spin-coated with a very thin layer of electroluminiscent polymers. Centrifugal forces distribute the polymers, liquefied by solvents, in an absolutely uniform manner. In a final step a mechanically flexible cathode, being a combination of various metals, is sputtered on the component. The final product is flexible and less than 500nm in thickness.
The manufacture of a display assembly which incorporates a flexible display poses a number of problems. One problem is that while the displays are flexible they will be damaged or their operation will be impaired if they are creased. Another difficulty is that although the display is flexible the associated driving circuitry is most readily mounted on rigid printed circuit boards. Accordingly a number of connections must be made between a flexible display and one or more rigid circuit boards which presents difficulties.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a display assembly which incorporates a flexible display and which is arranged so that the display may be folded or curved over on itself without creasing. According to the present invention there is provided a display assembly including: a flexible display screen having a plurality of connection points; at least two printed circuit boards located at the rear of said screen and defining a longitudinal region of the screen therebetween; and flexible connectors between connection points located in said region and each of the printed circuit boards; wherein the flexible connectors are of sufficient length to accommodate closing of the assembly about the longitudinal region.
The flexible connectors may comprise looms of wires. It is preferred that the printed circuit boards connect to the looms of wires by means of tape automated bonding films.
Typically the screen will be rectangular in shape with an edge of the screen and edges of the PCBs defining triangles and the flexible connectors terminating along edges of the triangles. Preferably said edge of the screen and edges of the PCBs define right triangles with the flexible connectors terminating along hypotenuses of the triangles.
Preferably the printed circuit boards are shaped so that the sum of the lengths of the hypotenuses is equal to said length of the display screen.
The flexible connectors may terminate along edges of the printed circuit board defining the longitudinal region of the screen.
In a preferred embodiment the screen comprises a flexible liquid crystal display.
Alternatively the screen may comprise an organic light emitting diode display.
The display assembly may be incorporated into a computational device, for example a laptop computer or electronic book.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is plan view of the front of a prior art display assembly.
Figure 2 is a plan view of the rear of a prior art display assembly.
Figure 3 is a plan view of the front of a display. Figure 4 is a plan view of the rear of a display assembly according to an embodiment of the present invention.
Figure 5 is a perspective view of an assembly according to an embodiment of the present invention in a compact configuration. Figure 6 is a plan view of an assembly according to an embodiment of the present invention in a display configuration.
Figure 7 is a plan view of the rear of a display assembly according to a further embodiment of the present invention in a compact configuration.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In order that members of the public may understand how the present invention may be put into practice a preferred embodiment of the invention will now be described.
A schematic view of a typical prior art passive matrix display assembly 10 is shown in Figure 1. The liquid crystal display 12 is designed to display dot pattern images. A plurality of row and column electrodes are horizontally and vertically disposed across the liquid crystal display. Connection points for the electrodes are located along edges of the liquid crystal display.
Circuit boards 14 and 18 are coupled to the row and column electrodes of the LCD by means of tape automated bonding (TAB) films 22 and 24. PCB's 14 and 18 support circuitry including a row driver chip and column driver chip, 26 and 28 respectively, for applying potentials to selected row and column electrodes in order to selectively activate liquid crystal cells to form a display. For mounting in an apparatus such as a laptop computer or mobile phone the printed circuit boards 18 and 14 may be folded back behind the screen as shown in Figure 2 which is a rear view of the display assembly.
It will be realized that flexing of the LCD 12 would place a strain on the TAB connections 22, 24 to each of PCBs 14 and 18.
A preferred embodiment of the present invention will now be described with reference to Figure 3. Figure 3 depicts a flexible LCD screen 30 including TAB connections 32 and 34 for connecting to display row electrodes.
Beneath the lower edges of the flexible LCD 30 there are located two angled TAB strips 36 and 38. Connection points on each of the angled TAB strips are connected to column electrodes of the LCD display by means of flexible wire looms 40 and 42 respectively. It may be noted that in the presently described embodiment, the distance LI along the TAB strip 36 is equal to the distance LI along the column electrodes to which it is connected by wire loom 42. Accordingly the distance between the column electrodes is maintained as the distance between contacts on the TAB strip which may be desirable in some circumstances. The arrangement is identical in respect of the left hand TAB strip 38 which has a length L2=L1.
Figure 4 shows a rear view of the display of Figure 3 with PCBs 44 and 46 attached to the folded over TAB strips 32-38. It will be noted that there is sufficient width in the longitudinal region of the screen, defined by edges A- A' and B-B', of the PCBs for the display to be curved or folded on itself without creasing. The bottom edge 41 of screen 30 along with edge A-A' of PCB 46 and TAB film 38 define a right triangle 39. Similarly triangle 37 is defined by edge B-B' of PCB 44 and TAB film 36.
The display assembly is shown curved upon itself to a compact configuration in Figure 5. Upon folding the screen as shown in Figure 5 the wires connecting column electrode connection points in the region between lines A-A' and B-B' (Fig. 3) to TAB strips 36 and 38 tighten. Accordingly a degree of slack must be present in those wires of looms 40 and 42 when the assembly is in an open configuration as shown in Figure 6.
Computational devices such as laptop computers, electronic books and the like may be designed with a hinged or otherwise folding housing to incorporate the display assembly thereby facilitating formation of a compact device.
A further embodiment of the invention is depicted in Figure 7. Figure 7 shows the rear of a display assembly in which the PCBs 54 and 56 do not project from the bottom of the screen. Rather column electrode connection points 52 in the region between A-A' and B- B' are connected to connection points 60 and 62 on the inner edges of PCBs 54 and 56 by flexible connectors 58.
Variations of the invention other than the embodiments that have been described with reference to Figures 3-7 are of course possible. For example other types of flexible display screen may be used such as an organic light emitting diode screen. Furthermore, the connection between the electrode contacts and the angled TAB films 38, 36 (Fig. 4) might be made by means other than wire looms. For example a flexible film having conductive traces upon it might be used to make the connections. Although the preferred embodiment has two printed circuit board defining a longitudinal flexing region of the screen it would also be possible to construct embodiments of the invention with other numbers of circuit boards.
While a preferred embodiment of the present invention has been described in detail herein, it should be clearly understood that many variations and/or modifications of the basic inventive concepts herein taught, which may appear to those skilled in the present art will still fall within the spirit and scope of the present invention as defined in the appended claims.

Claims

We claim:
1. A flexible display assembly including: a flexible display screen having a plurality of connection points; at least two printed circuit boards located at the rear of said screen and defining a longitudinal region of the screen therebetween; and flexible connectors between connection points located in said region and each of the printed circuit boards; wherein the flexible connectors are of sufficient length to accommodate closing of the assembly about the longitudinal region.
2. An assembly according to claim 1, wherein the flexible connectors comprise looms of wires.
3. An assembly according to claim 2, wherein the printed circuit boards connect to the looms of wires by means of tape automated bonding films.
4. An assembly according to claim 1, wherein an edge of the screen and edges of the PCBs define triangles and the flexible connectors terminate along edges of the triangles.
5. An assembly according to claim 4, wherein said edge of the screen and edges of the PCBs define right triangles with the flexible connectors terminating along hypotenuses of the triangles.
6. An assembly according to claim 5, wherein the PCB's are shaped so that the sum of the lengths of the hypotenuses is equal to said length of the display screen.
7. An assembly according to claim 1, wherein the flexible connectors terminate along edges of the printed circuit board defining the longitudinal region of the screen.
8. An assembly according to claim 6 or claim 7, wherein the screen comprises a flexible liquid crystal display.
9. An assembly according to claim 6 or claim 7, wherein the screen comprises an organic light emitting diode display.
10. A computational device including an assembly according to claim 1.
11. A computational device including an assembly according to claim 6 or claim 7.
PCT/AU2002/001170 2002-02-06 2002-08-29 Compact display assembly WO2003067564A1 (en)

Priority Applications (6)

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EP02759894A EP1479060A4 (en) 2002-02-06 2002-08-29 Compact display assembly
AU2002325641A AU2002325641B2 (en) 2002-02-06 2002-08-29 Compact display assembly
US10/502,577 US7128269B2 (en) 2002-02-06 2002-08-29 Compact display assembly
JP2003566836A JP4209333B2 (en) 2002-02-06 2002-08-29 Compact display assembly
IL163157A IL163157A (en) 2002-02-06 2004-07-22 Compact display assembly
US11/483,061 US7777856B2 (en) 2002-02-06 2006-07-10 Flexible electrical display

Applications Claiming Priority (2)

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US10/066,621 US6688528B2 (en) 1997-07-15 2002-02-06 Compact display assembly
US10/066,621 2002-02-06

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US11/483,061 Continuation US7777856B2 (en) 2002-02-06 2006-07-10 Flexible electrical display

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EP (1) EP1479060A4 (en)
JP (1) JP4209333B2 (en)
CN (1) CN1332244C (en)
AU (1) AU2002325641B2 (en)
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US9370094B2 (en) 2009-07-07 2016-06-14 Semiconductor Energy Laboratory Co., Ltd. Display device
US9735178B2 (en) 2009-07-07 2017-08-15 Semiconductor Energy Laboratory Co., Ltd. Display device
US9748275B2 (en) 2009-07-07 2017-08-29 Semiconductor Energy Laboratory Co., Ltd. Display device
US10147742B2 (en) 2009-07-07 2018-12-04 Semiconductor Energy Laboratory Co., Ltd. Display device
US10361221B2 (en) 2009-07-07 2019-07-23 Semiconductor Energy Laboratory Co., Ltd. Display device
US10411038B2 (en) 2009-07-07 2019-09-10 Semiconductor Energy Laboratory Co., Ltd. Display device
US10692891B2 (en) 2009-07-07 2020-06-23 Semiconductor Energy Laboratory Co., Ltd. Display device
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IL163157A (en) 2010-06-16
US20050146859A1 (en) 2005-07-07
CN1332244C (en) 2007-08-15
US6886751B2 (en) 2005-05-03
US6688528B2 (en) 2004-02-10
AU2002325641A1 (en) 2003-09-02
EP1479060A1 (en) 2004-11-24
EP1479060A4 (en) 2006-04-19
US7128269B2 (en) 2006-10-31
JP2005517293A (en) 2005-06-09
US20060249586A1 (en) 2006-11-09
US20050139684A1 (en) 2005-06-30
CN1618091A (en) 2005-05-18
US7777856B2 (en) 2010-08-17
US7032825B2 (en) 2006-04-25
JP4209333B2 (en) 2009-01-14
US20040159710A1 (en) 2004-08-19
US20020071066A1 (en) 2002-06-13
AU2002325641B2 (en) 2005-12-15

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