WO2002071131A2 - Affichage a double face pouvant etre visualise et comprenant un transflecteur commutable - Google Patents

Affichage a double face pouvant etre visualise et comprenant un transflecteur commutable Download PDF

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Publication number
WO2002071131A2
WO2002071131A2 PCT/US2001/051366 US0151366W WO02071131A2 WO 2002071131 A2 WO2002071131 A2 WO 2002071131A2 US 0151366 W US0151366 W US 0151366W WO 02071131 A2 WO02071131 A2 WO 02071131A2
Authority
WO
WIPO (PCT)
Prior art keywords
transflector
state
lcd
lcd cell
transparent
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2001/051366
Other languages
English (en)
Other versions
WO2002071131A3 (fr
Inventor
Ruben Rivera
Franky So
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Priority to JP2002569990A priority Critical patent/JP2004519718A/ja
Priority to GB0309261A priority patent/GB2384609B/en
Priority to AU2001297929A priority patent/AU2001297929A1/en
Priority to KR10-2003-7005598A priority patent/KR100516875B1/ko
Publication of WO2002071131A2 publication Critical patent/WO2002071131A2/fr
Publication of WO2002071131A3 publication Critical patent/WO2002071131A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133342—Constructional arrangements; Manufacturing methods for double-sided displays

Definitions

  • the present invention generally relates to display systems, and more particularly to a system and method for providing a display with a transflector portion that is selectable between a reflecting state and a transparent state.
  • LCDs are commonly used as display devices for equipment such as portable televisions, notebook computers, cellular telephones and other portable electronic devices.
  • a conventional LCD includes a plurality of LCD elements forming a plurality of rows and columns, each LCD including a pixel electrode and a common electrode with a portion of liquid crystal material disposed therebetween.
  • conventional LCDs employ a reflective mode which requires a predetermined minimum ambient light intensity to be available for providing sufficient contrast ratio in the display for satisfactory interpretation of the display by an observer.
  • conventional LCDs comprise a layered assembly comprising a top polarizer, a top substrate, a top electrode, a liquid crystal, a predetermined pattern or array of bottom electrodes, a bottom substrate, a bottom polarizer, and a reflector (transflector) .
  • the polarizers are aligned with axes at right angles to each other in an orthogonal relationship.
  • the principles of operation of LCDs are well known in the art. One such principle is that LCDs operate by reducing transmissibility of light through a thin layer of liquid crystal material when an electric field is applied.
  • FIG. 1 illustrates a schematic block representation of a side view of a double-sided display in accordance with one aspect of the present invention
  • FIG. 2 illustrates a front view of a portable communication device in an open state employing a double-sided display in accordance with one aspect of the present invention
  • FIG. 3 is a functional schematic block representation of components employed for viewing material in a front display of the portable communication device of FIG. 2 in the open state in accordance with one aspect of the present invention
  • FIG. 4 illustrates a front view of the portable communication device of FIG. 2 in a closed state employing a double-sided display in accordance with one aspect of the present invention
  • FIG. 5 is a functional schematic block representation of components employed for viewing material in a rear display of the portable communication device of FIG. 2 in the closed state in accordance with one aspect of the present invention
  • FIG. 6 is a schematic block diagram of a drive system employed for driving a double-sided display in accordance with one aspect of the present invention
  • FIG. 7 illustrates a schematic block representation of a side view of a single sided display in a transparent state in accordance with one aspect of the present invention
  • FIG. 8 illustrates a schematic block representation of the single sided display of FIG. 7 in a reflective state in accordance with one aspect of the present invention
  • FIG. 9 is a flow diagram illustrating one particular methodology for displaying material on a front side or a rear side of a double-sided display in accordance with one aspect of the present invention
  • FIG. 10 is a flow diagram illustrating one particular methodology for displaying material or providing a clear window of a single sided display in accordance with one aspect of the present invention.
  • the present invention relates to a system and/or method for providing an LCD device with a transflector portion that has a reflective state and a transparent state.
  • Two transflector portions can be provided to form a device with a double-sided display or one transflector portion can be employed to provide a display with a displaying state and a transparent state. While the following description of one aspect of the present invention primarily relates to portable communication devices, it will be understood and appreciated by those skilled in the art that a system and/or method in accordance with the present invention also may be implemented in conjunction with other types of display implementations .
  • FIG. 1 illustrates a block diagram side view of a double- sided viewable display 10 according to one aspect of the present invention.
  • the double-sided viewable display 10 includes a first transflector portion 12 disposed on a first side of an LCD cell 14 and a second transflector portion 20 residing on a second side of the LCD cell 14.
  • a first polarizer 13 resides between the first transflector portion 12 and the first side of the LCD cell 14 and a second polarizer 18 resides between the second transflector portion 20 and the second side of the LCD cell 14.
  • the LCD cell 14 is formed from a liquid crystal layer 16, for example of a twisted nematic type, disposed between a first electrode 15 and a second electrode 17.
  • the first and second electrodes 15 and 17 both include a pattern or array of transparent electrodes .
  • the first and second polarizers 13 and 18 are employed to polarize ambient light in an X and a Y direction that passes through the polarizers 13 and 18.
  • the use of polarizers in twisted nematic (TN) and ,(STN) LCD devices is well known to those skilled in the art, therefore, further discussion of the polarizers 13 and 18 has been omitted for the sake of brevity.
  • the transflector portions 12 and 20 can be formed, for example, from an electrochro ic material or a polymer dispersed liquid display material.
  • the electrochromic material or the polymer dispersed liquid display material can be utilized to provide a cell that is in one of a substantially clear state or a reflective semi-opaque state.
  • EC electrochromic cell
  • An EC can be selected to provide a clear state and a colored state where the color can be one of blue, green, black and white.
  • cells of varying colors may be stacked to provide a multicolored transflector portion.
  • a white EC is provided for each transflector portion 12 and 20.
  • the LCD cell 14 is sandwiched between the polarizers 13 and 18, and the transflector portions 12 and 20.
  • Applying a voltage V + to the first transflector portion 12 and not to the second transflector portion 20 causes the first transflector portion 12 to become semi-opaque and reflective and the second transflector portion 20 to become clear or transparent. Therefore, incident light passing through the second transflector portion 20 is reflected back by the first transflector portion 12 to allow viewing of the LCD cell 14 through the second transflector portion 20.
  • FIG. 2 illustrates an application of the double-sided viewable display to a portable communication device 30.
  • the portable communication device 30 includes a top portion 32 having a double-sided viewable display 34 with a front surface 40 and a rear surface 42 (FIG. 4) .
  • the portable communication device 30 also has a bottom portion 36 with a keypad 38 for inputting information into the portable communication device 30.
  • the portable communication device 30 has an open state as illustrated in FIG. 2 and a closed state as illustrated in FIG. 4.
  • the text illustrated on FIG. 2 is displayed on the front surface 40 of the display 34 when the portable communication device is in its open state.
  • the first transreflector portion 12 (disposed on the rear) is in a semi-opaque or reflective state and the second transflector portion 20 (disposed on the front) is in a clear or transparent state during display of the text from the front surface 40.
  • the text is displayed on the rear surface 42 (FIG. 4) of the display 34 when the portable communication device 30 is in its closed state as can be seen in FIG. 4.
  • the second transreflector portion 20 is in a semi-opaque or reflective state and the first transflector portion 12 is in a substantially clear or transparent state during display of the text from rear surface 42.
  • FIG. 6 illustrates an example of a drive system 50 employed to provide similar displaying on either the front surface 40 or the rear surface 42 of the double-sided display 34.
  • An LCD drive circuitry component 58 provides drive signals to a drive inverter component 56 and a drive selection component 54 for providing drive signals to LCD cells on the double-sided display 34.
  • the drive inverter component 56 provides inverted and synchronized signals such that textual and graphical content are displayed on the rear surface 42 of the display 34, similar to how it appears on the front surface 40 when the double-sided display 34 receives drive signals from the LCD drive circuitry component 58 directly.
  • the inverted drive signals are preferably provided employing logic circuitry such as a programmable logic device (PLD) , but alternatively could be accomplished by unique programming instructions or the like.
  • the inverted drive signals are inverted over two axes as opposed to a single axis, as would be employed in a mirror reflection device. Implementation of the inverted drive signals from the LCD drive circuitry 58 can be easily facilitated by
  • Both the LCD drive circuitry signals and the inverted LCD drive circuitry signals are inputted into the drive selection component 54.
  • the drive selection component 54 switches between transmitting the drive circuitry signals and the inverted drive circuitry signals to the double-sided display 34 based on the state of a display position switch 52.
  • the display position switch 52 changes state upon changing the portable communication device to between the open state and the closed state.
  • the display position switch 52 is coupled to the doubled sided display 34 and determines which of the transflector portions 12 and 20 will be semi-opaque (provided with a voltage potential) for providing reflecting and which will be substantially clear (not provided with a voltage potential) for providing viewing.
  • the double-sided display 34 may provide displaying of an image and/or textual contents on both sides of the display 34 by switching between transflector portions 12 and 20 and simultaneously switching between drive input signals and inverted drive input signals. For example, by inputting a square wave signal in the range of 250-350 HZ to the display position switch 52 output, it is possible to provide viewing on both sides of the display 34 concurrently.
  • An alternating switch signal will allow alternating the first transflector portion 12 between a semi-opaque and a substantially clear state, while second transflector 20 alternates between a clear and semi-opaque state.
  • the alternating switch signal also provides multiplexing of the drive input signals and inverted drive input signals through the drive selection component 54.
  • a single transflector portion is employed for providing a display having a displaying state and a substantially clear transparent state.
  • this type of implementation may find applicability in a retail market such as a jewelry store where information on a product may be viewed in a display state and the product may be viewed in the clear transparent state.
  • a single sided display 60 is provided having an LCD cell 64 disposed between a first polarizer 62 and a second polarizer 66.
  • a single transflector portion 68 is provided on one side of the LCD cell 66.
  • the single transflector portion 68 can be formed from an electrochromic material or a polymer dispersed liquid display material.
  • the electrochromic material or the polymer dispersed liquid display material can be utilized to provide a cell that is in one of a substantially clear state or a semi-opaque state.
  • These types of single transflector portion 68 can change color upon an application of a voltage to the cell.
  • a voltage to the cell For example, in the case of an electrochromic cell (EC) , when there is no voltage applied to the cell, the cell is optically clear. If a DC voltage is applied to the cell, the cell turns into a semi-opaque color state, which is reflective.
  • An EC can be selected to provide a clear state and a colored state where the color can be one of blue, green, black and white. Additionally, cells of varying colors may be stacked to provide a multicolored transflector portion.
  • a white EC is provided for the single transflector portion 68.
  • the light transmits through the front and rear surfaces of single sided display 60 and provides a clear view of an object (or objects) on the opposite side of the display in other words, the display becomes a transparent window.
  • the light does not transmit through the single sided display but passes through the front surface and is reflected back to display an image generated by the LCD cell 64.
  • FIGS. 9-10 a methodology for employing a transflector in an LCD device where the transflector has a selectable state between a reflective state and a transparent state may be better appreciated with respect to the flow diagrams of FIGS. 9-10. While, for purposes of simplicity of explanation, the methodologies of FIGS. 9-10 is shown and described as a series of steps, it is to be understood and appreciated that the present invention is not limited to the order of steps, as some steps may, in accordance with the present invention, occur in different orders and/or concurrently with other steps from that shown and described herein. Moreover, not all illustrated steps may be required to implement a methodology in accordance with an aspect of the present invention.
  • a methodology for operating the double sides display illustrated in FIGS. 1-6 begins at step 100 where power is provided to the device having the double-sided display.
  • the device determines whether or not the device has powered up in the first state.
  • the first state is where a portable communication device is in an open state as illustrated in FIG. 2, while a second state is where the portable cellular communication device is in its closed state.
  • YES first state
  • voltage is applied to a first transflector portion and voltage is removed from a second transflector portion at step 120 for providing viewing from a first side of the double-sided display.
  • LCD drive signals are transmitted to the LCD cell.
  • the device then continuously monitors whether or not the device is still in the first state at step 140.
  • the device When the device is no longer in the first state in either step 110 or step 140 (NO) , the device has entered a second state and advances to step 125.
  • the device applies voltage to the second transflector portion and voltage is removed from the first transflector portion for providing viewing from a second side of the double-sided display.
  • inverted LCD drive signals are then transmitted to the LCD cell.
  • the device then continuously monitors whether or not the device is in the second state at step 145. If the device is not in the second state (NO), the device has moved to the first state and the device advances to step 120, otherwise the device remains in the second state.
  • a methodology for operating the single sided display illustrated in FIGS. 7-8 begins at step 200 where power is provided to the device having the single sided display.
  • the device determines whether or not the device has powered up in the first state.
  • the first state is where the single sided display provides information relating to a product residing underneath the single sides display such as illustrated in FIG. 8, while a second state is where the single sided display provides a clear window for viewing the product residing underneath the single sided display as illustrated in FIG. 7. If the device is in a first state (YES) , voltage is applied to a transflector portion at step 220 for providing viewing of information on the single sided display.
  • step 230 LCD drive signals are transmitted to the LCD cell.
  • the device then continuously monitors whether or not the device is still in the first state at step 240. If the device is not in the first state in either step 210 or step 240 (NO) , the device has entered a second state and advances to step 225. At step 225, the device removes the voltage that is applied to the transflector portion for providing a clear view of a product on the other side of the single sided display. At step 235, transmission of the LCD drive signals are disabled. The device then continuously monitors whether or not the device is in the second state at step 245. If the device is not in the second state (NO) , the device has moved to the first state and the device advances to step 220, otherwise the device remains in the second state.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

L'invention concerne un système et/ou un procédé permettant d'obtenir un dispositif LCD (10) comprenant une partie de transflecteur présentant un état réfléchissant et un état transparent. Deux parties de transflecteur (12, 20) permettent de créer un dispositif à affichage à double face ou une partie de transflecteur (68) est mise en oeuvre de manière à obtenir un affichage présentant un état d'affichage et un état transparent.
PCT/US2001/051366 2000-10-23 2001-10-22 Affichage a double face pouvant etre visualise et comprenant un transflecteur commutable Ceased WO2002071131A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2002569990A JP2004519718A (ja) 2000-10-23 2001-10-22 切り替え可能の半透過反射部を有した両面視認可能な表示装置
GB0309261A GB2384609B (en) 2000-10-23 2001-10-22 Double-sided viewable display with switchable transflector
AU2001297929A AU2001297929A1 (en) 2000-10-23 2001-10-22 Double-sided viewable display with switchable transflector
KR10-2003-7005598A KR100516875B1 (ko) 2000-10-23 2001-10-22 전환가능한 트랜스플렉터를 갖는 시인가능한 양면디스플레이

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69317300A 2000-10-23 2000-10-23
US09/693,173 2000-10-23

Publications (2)

Publication Number Publication Date
WO2002071131A2 true WO2002071131A2 (fr) 2002-09-12
WO2002071131A3 WO2002071131A3 (fr) 2003-02-06

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PCT/US2001/051366 Ceased WO2002071131A2 (fr) 2000-10-23 2001-10-22 Affichage a double face pouvant etre visualise et comprenant un transflecteur commutable

Country Status (6)

Country Link
JP (1) JP2004519718A (fr)
KR (1) KR100516875B1 (fr)
CN (1) CN1240042C (fr)
AU (1) AU2001297929A1 (fr)
GB (1) GB2384609B (fr)
WO (1) WO2002071131A2 (fr)

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WO2002071131A3 (fr) 2003-02-06
KR20030046517A (ko) 2003-06-12
GB2384609B (en) 2004-09-08
JP2004519718A (ja) 2004-07-02
KR100516875B1 (ko) 2005-09-26
CN1240042C (zh) 2006-02-01
CN1470045A (zh) 2004-01-21
GB2384609A (en) 2003-07-30
AU2001297929A1 (en) 2002-09-19

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