WO2009109876A1 - Système de rétroéclairage, système de détection de lumière et dispositif d'affichage - Google Patents

Système de rétroéclairage, système de détection de lumière et dispositif d'affichage Download PDF

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Publication number
WO2009109876A1
WO2009109876A1 PCT/IB2009/050772 IB2009050772W WO2009109876A1 WO 2009109876 A1 WO2009109876 A1 WO 2009109876A1 IB 2009050772 W IB2009050772 W IB 2009050772W WO 2009109876 A1 WO2009109876 A1 WO 2009109876A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
channel
backlighting system
exit window
light channel
Prior art date
Application number
PCT/IB2009/050772
Other languages
English (en)
Inventor
Giovanni Cennini
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 WO2009109876A1 publication Critical patent/WO2009109876A1/fr

Links

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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • 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 improved efficiency of guiding the light from the light source to the light sensor allows the use of less sensitive light sensors for sensing the intensity and/or color of the light emitted by the light source, which typically also reduces the cost of the required light sensor and thus of the light-sensing system as a whole.
  • the light-incoupling structures are arranged at at least part of an outer wall of the light channel substantially opposite from an entrance window of the light channel, the at least part of the outer wall being arranged substantially parallel to the central axis, the entrance window being a further part of the outer wall of the light channel through which light enters the light channel.
  • the outer wall may be a circular or elliptical wall arranged substantially around the central axis
  • the entrance window may be, for example, part of the outer wall.
  • the incoupling structures are uniformly distributed or are grouped near the at least one light source.
  • the uniform distribution of incoupling structures has the advantage that the position of the light channel with respect to the at least one light source is less critical. This reduces production tolerances when manufacturing the backlighting system according to the invention, which generally reduces the cost of the backlighting system.
  • Grouping the incoupling structures near the at least one light source has the advantage that it improves the efficiency of guiding the incoupled light through the light channel.
  • the incoupling structures do not only cause light to be coupled into the light channel, but also cause part of the captured light to be re-emitted by the light channel at incoupling structures along the path of the guided light. Limitation of the number of incoupling structures by only providing light-incoupling structures near the at least one light source further improves the efficiency of guiding the light by the light channel and thus the efficiency of the light-sensing system.
  • the light impinging on the light sensor and originating from a light source which is located nearby has a much higher intensity than the light impinging on the light sensor and originating from a light source which is located further away, while the emitted light intensity of the two light sources is substantially identical.
  • the intensity of the light emitted by a light source decreases when the distance increases. Due to this effect, the light sensor used in such a configuration must have a relatively large dynamic range, which makes the light sensor relatively expensive.
  • a light-sensing plate is used to capture part of the emitted light for measurement.
  • the cross-section of the light channel 40 preferably does not have a circular or elliptical shape. This is because such a circular or elliptical light channel 40 partially functions as a lens which may considerably reduce the uniformity of the light across the exit window 30.
  • the light channel 40 may be located on the backplate 70 (see Fig. 2A), or it may be integrated in the backplate 70 (see Fig. 2B). In these embodiments, the presence of the light channel 40 hardly disturbs the uniformity of the light across the exit window 30, and in such an embodiment, the light channel 40 may also have a circular or elliptical cross-section.
  • the arrangement of the light channel 40 shown in Figs. 2A and 2B has the further advantage that the height h of the backlighting system 101, 102 may be reduced.
  • the light channel 40 is arranged at an imaginary plane 60 between the at least one light source 20 and the exit window 30. Due to this location, some disturbance of the light emitted by the at least one light source 20 due to the light channel 40 is expected. To reduce the impact of this disturbance on the uniformity at the exit window 30, the height h of the backlighting system 100 may need to be increased so as to mix the light disturbed by the presence of the light channel 40 before it reaches the exit window 30. As the arrangement of the light channel 40 in the backlighting system 101, 102 in Figs.
  • the backlighting system 101, 102 shown in Fig. 2C may be, for example, a scanning backlighting system 101, 102 having a scan line 90 indicated by the broken- line rectangle 90.
  • the light sources 20 located within this rectangle 90 are the corresponding light sources 20 which are switched on during the scan time at the scan line 90.
  • the arrow 92 indicates the scan direction of the scan line 90 indicating the subsequent corresponding light sources 20 in the rows 28 of light sources 20 which are sequentially switched on to generate scanning of the scanning backlighting system 101, 102.
  • the signal received at the light sensor 50 will be sequentially based on the light emitted by different light sources 20 in the rows 28 of light sources 20.
  • a plurality of light channels 40 is connected by means of a kind of collimating arrangement 94 so as to consolidate the captured light of the plurality of light channels 40 to a single light sensor 50.
  • an optical element 96 for example, a lens element is arranged between the light channel 40 and the light sensor 50. Use of this lens element 96 may enable the light guided by the light channel 40 to be further focused onto the sensitive surface of the light sensor 50.
  • Figs. 4A, 4B and 4C are shown in relation to the embodiment shown in Fig. IA, the different light-incoupling structures 49, 48, 46 shown in Figs. 4A, 4B and 4C may also be applied to the other arrangements shown in Figs. 2A and 2B.
  • the backlighting system 102 may further comprise a controller 120 for receiving feedback information 130 from the light sensors 50 of the light sources 20 for controlling an intensity and/or color of the light emitted by each light source 20.
  • the backlighting system 102 may be a one or two- dimensional dimmable backlighting system.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention porte sur un système de rétroéclairage (100, 101, 102), sur un système de détection de lumière (10, 11, 12) et sur un dispositif d'affichage (200). Le système de rétroéclairage comprend au moins une source de lumière (20 ; 22, 24, 26) pour éclairer une fenêtre de sortie (30) du système de rétroéclairage, et un système de détection de lumière pour détecter une partie de la lumière émise par la source de lumière. Le système de détection de lumière comprend un canal de lumière (40) pour guider la lumière sensiblement parallèlement à un axe central du canal de lumière en direction d'une fenêtre de sortie de lumière du canal de lumière. Le canal de lumière a une largeur qui est plus petite que la fenêtre de sortie et comprend des structures de couplage de lumière (46, 47, 48, 49) pour coupler la lumière dans le canal de lumière. Le système de détection de lumière comprend en outre un capteur de lumière (50) configuré pour détecter au moins une partie de la lumière émise par la fenêtre de sortie de lumière du canal de lumière.
PCT/IB2009/050772 2008-03-06 2009-02-26 Système de rétroéclairage, système de détection de lumière et dispositif d'affichage WO2009109876A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08152371 2008-03-06
EP08152371.4 2008-03-06

Publications (1)

Publication Number Publication Date
WO2009109876A1 true WO2009109876A1 (fr) 2009-09-11

Family

ID=40602236

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/050772 WO2009109876A1 (fr) 2008-03-06 2009-02-26 Système de rétroéclairage, système de détection de lumière et dispositif d'affichage

Country Status (2)

Country Link
TW (1) TW200951574A (fr)
WO (1) WO2009109876A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015065516A1 (fr) * 2013-11-01 2015-05-07 Bodhi Technology Ventures Llc Détection de la lumière ambiante à travers un corps humain

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040119908A1 (en) * 2002-12-18 2004-06-24 Advanced Display Inc. Planar light source device, liquid crystal display apparatus, and display apparatus
WO2007020720A1 (fr) * 2005-08-12 2007-02-22 Sharp Kabushiki Kaisha Dispositif de commande d’une source de lumière, dispositif d’éclairage et dispositif d’affichage à cristaux liquides
US20070171669A1 (en) * 2006-01-23 2007-07-26 Sang-Gil Lee Backlight assembly and liquid crystal display device having the same
US20070297172A1 (en) * 2006-05-30 2007-12-27 Sony Corporation Backlight apparatus and color image display apparatus
US20080030650A1 (en) * 2006-06-30 2008-02-07 Kabushiki Kaisha Toshiba Illumination apparatus and liquid crystal display apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040119908A1 (en) * 2002-12-18 2004-06-24 Advanced Display Inc. Planar light source device, liquid crystal display apparatus, and display apparatus
WO2007020720A1 (fr) * 2005-08-12 2007-02-22 Sharp Kabushiki Kaisha Dispositif de commande d’une source de lumière, dispositif d’éclairage et dispositif d’affichage à cristaux liquides
EP1924127A1 (fr) * 2005-08-12 2008-05-21 Sharp Kabushiki Kaisha Dispositif de commande d'une source de lumière, dispositif d'éclairage et dispositif d'affichage à cristaux liquides
US20070171669A1 (en) * 2006-01-23 2007-07-26 Sang-Gil Lee Backlight assembly and liquid crystal display device having the same
US20070297172A1 (en) * 2006-05-30 2007-12-27 Sony Corporation Backlight apparatus and color image display apparatus
US20080030650A1 (en) * 2006-06-30 2008-02-07 Kabushiki Kaisha Toshiba Illumination apparatus and liquid crystal display apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015065516A1 (fr) * 2013-11-01 2015-05-07 Bodhi Technology Ventures Llc Détection de la lumière ambiante à travers un corps humain

Also Published As

Publication number Publication date
TW200951574A (en) 2009-12-16

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