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WO2002006891A1 - Afficheur - Google Patents

Afficheur Download PDF

Info

Publication number
WO2002006891A1
WO2002006891A1 PCT/DE2001/002521 DE0102521W WO0206891A1 WO 2002006891 A1 WO2002006891 A1 WO 2002006891A1 DE 0102521 W DE0102521 W DE 0102521W WO 0206891 A1 WO0206891 A1 WO 0206891A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
display
emitting diode
light guide
organic light
Prior art date
Application number
PCT/DE2001/002521
Other languages
German (de)
English (en)
Inventor
Stephan Windisch
Siegfried DOBRAWA
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2002006891A1 publication Critical patent/WO2002006891A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the invention relates to a display with a light source for illuminating the display background.
  • the invention relates to a device with a corresponding display.
  • Displays in particular liquid crystal displays (LCDs), are usually illuminated by a light source in the form of an LED, incandescent lamp or CCFT (Cold Cathode Fluorescence Tube), the light of which is coupled into a light guide.
  • This light guide is designed in such a way that the display is illuminated as homogeneously as possible. This is particularly important when using displays in small portable devices such.
  • B. mobile devices, pagers or PDAs Personal Digital Assistants
  • optimization of the light guide with which the light emitted punctually from the individual light sources is distributed in the light guide so that the illumination is as homogeneous as possible, can only be achieved with difficulty under a certain light guide thickness.
  • the use of individual point-shaped light sources therefore often leads to bright spots in the display backlight, the so-called “hot spots”.
  • the light source comprises a flat organic light emitting diode.
  • OLEDs Organic light-emitting diodes
  • LEDs inorganic light emitting diodes
  • PLEDs polymer light-emitting diodes
  • the organic light-emitting diodes have only a small thickness of a few tenths of a millimeter and can in principle be arranged directly under the display over a large area, so that the light from the light-emitting diode is emitted directly through the display > ⁇ tt h- 1 ⁇ ⁇ in o Üi O Oi tr ⁇ ⁇ p tr Hi N ⁇ cn tr tr 1 ⁇ 3 SQ ⁇ HPP C ⁇ H 3 ⁇ ! ⁇ tr ⁇ N ⁇ PS
  • the organic light-emitting diode can either be applied to a separate carrier, for example a glass plate or the like, or else to a circuit board, for example the main circuit board of the device or a separate display circuit board which carries the control electronics for the display.
  • the organic light-emitting diode can also be applied directly to the back of the display or to the light entry surface. That is, in this case, the display or the light guide itself form the carrier for the light-emitting diode.
  • the organic light-emitting diode is integrated as a layer in the display or the light guide.
  • such a display is particularly suitable for use in small mobile devices, for example mobile telephones, pagers, PDAs, pocket calculators, etc.
  • small mobile devices for example mobile telephones, pagers, PDAs, pocket calculators, etc.
  • the lighting of devices should be as homogeneous and bright as possible, whereby the power consumption must be kept low while reducing the volume or the thickness of the lighting module.
  • the organic light emitting diode 6 may be configured ⁇ understandable on a separate support, for example on a glass plate to be applied, then the organic light emitting diode is glued together with the carrier, for example, under the glass substrate 3 of the display unit 1 to the rear side. 4
  • a conventional LCD 1 is also used, the LCD controller 14 being applied directly to the lower glass carrier 3 as an exemplary embodiment and thus representing the above-mentioned “Chip On Glass X ⁇ structure (COG).
  • COG Chip On Glass X ⁇ structure
  • the organic light-emitting diode 7 is not applied directly to the rear side 4 of the glass carrier 3. Instead, there is a bridge-like light guide 8 with two foot surfaces under the glass carrier 3 directly adjacent to the rear side 4. These two foot surfaces form the light entry surfaces 9 of the light guide 8.
  • a flat, strip-shaped organic light-emitting diode adjoins the foot surfaces, which illuminate the foot surfaces uniformly.
  • these are individual organic light-emitting diode segments 7, which are each assembled to form a strip-shaped light-emitting diode, so that the foot surfaces are covered over the entire area. In principle, however, it can of course also be two continuous, elongated individual light-emitting diodes.
  • the individual organic light-emitting diodes 7 are here applied directly to the main circuit board 11, which thus serves as a carrier for the organic light-emitting diodes 7.
  • the light guide 8 is simply placed with the foot surfaces in a suitable position on the strips consisting of the organic light-emitting diodes 7.
  • the bridge-like light guide 8 is designed such that the light is guided from the foot surfaces to the bridge surface adjoining the rear side 4 of the display 1, which serves as the light exit surface 10 in this light guide 8.
  • the dimensions of the light guide 8 are selected such that the light exit surface 10 irradiates the entire active surface of the display
  • the appropriate redirection of the incident light within the light guide 8 from the light exit surface 10 can be done by suitable positioning of integrated prisms in the light guide 8. These prisms are e.g. B. in the underside of the light guide 8 opposite the light exit surface 10 and have different sizes distributed over the surface, so that the less light is deflected upwards out of the light exit surface 10, the smaller the distance from the foot surfaces, so that overall a uniform luminance is achieved.
  • a light guide with a different shape can also be used instead of the bridge-like light guide.
  • it can be an L-shaped light guide with only one light entry surface, or a flat, block-shaped light guide is used in which the light is radiated into the side edge surfaces.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un afficheur pourvu d'une source lumineuse pour l'éclairage de l'arrière-plan de l'afficheur. L'afficheur selon l'invention est caractérisé en ce que la source lumineuse comprend une diode électroluminescente organique plane.
PCT/DE2001/002521 2000-07-17 2001-07-06 Afficheur WO2002006891A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10034689.8 2000-07-17
DE10034689 2000-07-17

Publications (1)

Publication Number Publication Date
WO2002006891A1 true WO2002006891A1 (fr) 2002-01-24

Family

ID=7649190

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/002521 WO2002006891A1 (fr) 2000-07-17 2001-07-06 Afficheur

Country Status (1)

Country Link
WO (1) WO2002006891A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2390437A (en) * 2002-07-06 2004-01-07 Nokia Corp Liquid crystal display device comprising an electrically operated optical layer
WO2004051318A3 (fr) * 2002-12-02 2004-09-23 Siemens Ag Dispositif d'eclairage
DE10333040A1 (de) * 2003-07-21 2005-02-17 Schott Ag Leuchtelement
US7436470B2 (en) 2002-07-06 2008-10-14 Spyder Navigations L.L.C. Display device having liquid crystal layer and switchable optical layer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100422A (en) * 1975-08-29 1978-07-11 U.S. Philips Corporation Light conductor in a signal isolator
US5876107A (en) * 1995-06-27 1999-03-02 Lumitex, Inc. Light emitting panel assemblies
WO1999066483A1 (fr) * 1998-06-19 1999-12-23 Cambridge Display Technology Ltd. Ecrans retro-eclaires

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100422A (en) * 1975-08-29 1978-07-11 U.S. Philips Corporation Light conductor in a signal isolator
US5876107A (en) * 1995-06-27 1999-03-02 Lumitex, Inc. Light emitting panel assemblies
WO1999066483A1 (fr) * 1998-06-19 1999-12-23 Cambridge Display Technology Ltd. Ecrans retro-eclaires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OGAWA N ET AL: "Field-sequential-color LCD using switched organic EL backlighting", SOCIETY FOR INFORMATION DISPLAY 1999 INTERNATIONAL SYMPOSIUM, PROCEEDINGS OF THE 1999 SID INTERNATIONAL SYMPOSIUM, SEMINAR & EXHIBITION, SAN JOSE, CA, USA, 18-20 MAY 1999, USA, pages 1098 - 1101, XP002181977 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2390437A (en) * 2002-07-06 2004-01-07 Nokia Corp Liquid crystal display device comprising an electrically operated optical layer
GB2390437B (en) * 2002-07-06 2006-02-08 Nokia Corp A display device
US7436470B2 (en) 2002-07-06 2008-10-14 Spyder Navigations L.L.C. Display device having liquid crystal layer and switchable optical layer
US7821597B2 (en) 2002-07-06 2010-10-26 Steve Doe Display device having liquid crystal layer and switchable optical layer
WO2004051318A3 (fr) * 2002-12-02 2004-09-23 Siemens Ag Dispositif d'eclairage
DE10333040A1 (de) * 2003-07-21 2005-02-17 Schott Ag Leuchtelement

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