EP3487265B1 - Appareil d'éclairage pour an dispositif d'affichage - Google Patents

Appareil d'éclairage pour an dispositif d'affichage Download PDF

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Publication number
EP3487265B1
EP3487265B1 EP17201953.1A EP17201953A EP3487265B1 EP 3487265 B1 EP3487265 B1 EP 3487265B1 EP 17201953 A EP17201953 A EP 17201953A EP 3487265 B1 EP3487265 B1 EP 3487265B1
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EP
European Patent Office
Prior art keywords
light sources
light
photodetector
lighting apparatus
reflective element
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.)
Active
Application number
EP17201953.1A
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German (de)
English (en)
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EP3487265A1 (fr
Inventor
Barbaros KÍRÍSKEN
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.)
Vestel Elektronik Sanayi ve Ticaret AS
Original Assignee
Vestel Elektronik Sanayi ve Ticaret AS
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Priority to EP17201953.1A priority Critical patent/EP3487265B1/fr
Priority to TR2017/19137A priority patent/TR201719137A2/tr
Publication of EP3487265A1 publication Critical patent/EP3487265A1/fr
Application granted granted Critical
Publication of EP3487265B1 publication Critical patent/EP3487265B1/fr
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H05B45/22—Controlling the colour of the light using optical feedback

Definitions

  • the present disclosure relates to a lighting apparatus according to claim 1 and to a display device according to claim 10.
  • Light sources are used in a variety of consumer apparatus and devices. These include, for example, display devices. In devices such as these, it is desirable that the light sources are calibrated. This ensures, for example, that the light output by the individual pixels can be controlled in a predictable and uniform manner. Generally, calibration of the light sources is done during the manufacture of the device that employs the light sources. However, variations in the behaviour of the individual light sources can develop over time, as the device is used. These variations can have an unwanted effect on for example the intensity and / or colour of the light that is output by the device.
  • US2012146058A1 discloses a light emitting diode module which includes a plurality of light emitting diodes, a colour sensor and a controller.
  • the module includes a reflection region at the path of the light emitting from a half peak angle of each light emitting diode.
  • the colour sensor detects the light reflected from the reflection region.
  • the controller adjusts driving currents of the light emitting diodes according to the luminous intensities of the light of the light emitting diodes reflected by the reflection region and detected by the colour sensor.
  • WO2006054234A2 discloses a luminaire comprising an array of LEDs emitting light of at least one colour, and a control system for controlling the light output of the luminaire.
  • the control system comprises a photosensor array for detecting light output of the luminaire.
  • An imaging unit is arranged in front of the photosensor array such that it maps an image of the array of LEDs on the photosensor array.
  • the photosensor array is divided into subareas each detecting light output from a single one of the LEDs.
  • the control system uses the output of the subareas for controlling the luminaire light output.
  • the invention also provides display device as defined in claim 10.
  • lamps or luminaires many consumer electronics apparatus or devices, display devices for many different types of consumer apparatus, including for example television screens or monitors, computer displays or monitors, and displays for other computing devices, including smartphones, tablet computers, laptop computers, etc.
  • Display devices are also used in many public environments in so-called "signage", for example, for displaying adverts or for information or entertainment that is of interest to a larger audience.
  • display devices in particular employ a number of light sources for providing light to generate an image or, more simply, to generate lighting effects.
  • Each light source may correspond to an individual pixel or "sub-pixel" (i.e. different coloured parts of the pixel) of the image and generates the pixel of the image directly.
  • the light source may be an (inorganic) light-emitting diode (LED) or an organic light-emitting diode (OLED) and may be used as part of an LED or OLED display device (described below).
  • Figure 1 shows schematically an example 2. not covered by the invention 2. of a display device 10 having a plurality of light sources.
  • the display device 10 comprises at least a reflector panel 12 and a display panel 14.
  • the display panel 14 comprises a plurality of light sources 16 for generating the pixels of an image directly.
  • the light sources 16 may for example generate coloured light of different colours or may generate white light which is then passed through coloured filters of different colours.
  • the colour of light emitted by the light sources may be for example red, green or blue (“RGB").
  • some of the light sources may also be configured to emit yellow light (so-called RGBY) or white light (so-called RGBW).
  • the light sources 16B may each be formed of three light sources which emit red, green or blue light respectively. It will be appreciated that the light sources (and any associated colour filters) may in general be arranged according to any type of geometric layout, for example, a regular rectangular array.
  • Display devices that generate the pixels directly include for example display screens that use OLEDs (organic light emitting diodes) or plasma technology and display screens or devices that use (inorganic) LEDs, including for example so-called LED walls (often used for "signage”) and micro LED displays.
  • the behaviour of the light sources may change over time.
  • each of the light sources may behave substantially the same way as each other or at least in a predictable manner.
  • some of the light sources may start to behave differently from the other light sources, or differently from an expected behaviour.
  • the intensity of light and / or colour output by one or more of the light sources may vary from a desired value. This may occur, for example, as a result of changes in temperature to the one or more light sources whilst in use. This may also occur as a result of the light sources changing their behaviour over time, or the light sources approaching the end of their life expectancy.
  • a lighting apparatus in which a plurality of light sources are located at different respective locations on a surface, and are used for emitting light. Reflective elements are arranged to receive light from at least two of the plurality of light sources and to direct the received light to photodetectors. The photodetectors are located at a location on the surface that is between the locations of the at least two light sources.
  • the reflective elements have a shape that enables light to be gathered over a relatively large area and to be directed to the photodetectors.
  • the photodetector occupies a small area of the surface, the area typically corresponding in size to the area of the surface occupied by an individual light source.
  • the present lighting apparatus allows the light output by two or more light sources to be monitored accurately (by virtue of being located close to the two or more light sources), whilst providing minimal interference with the overall light that is output by the apparatus (by virtue of the photodetectors occupying a small portion of the surface).
  • examples of present lighting apparatus according to the present disclosure do not suffer from the drawbacks that are often found in known systems for monitoring the light output of a device / apparatus.
  • references to a display device may correspond to any of the display devices described previously. It will be also appreciated that the same principles may apply to for example a luminaire device that comprises a plurality of light sources as described above.
  • Figure 2 shows schematically a plan view of a section 20 of a lighting apparatus comprising a plurality of light sources 21.
  • the light sources 21 may comprise, for example, the light sources of an LED or an OLED screen.
  • each light source 21 is operable to generate a sub-pixel of an image.
  • each light source 21 is operable to generate at least red, green or blue light (labelled 'R', 'G', and 'B' in Figure 2 respectively).
  • a photodetector 22 (denoted 'X') is shown as being located between two of the light sources 21.
  • the photodetector 22 is comparable in size to the size of the light sources 21 (as shown schematically in Figure 2 ).
  • the photodetector 22 is arranged to receive light from at least two light sources 21 that are neighbours to the photodetector 22. This is achieved via a reflective element (not shown in Figure 2 but discussed further below).
  • the photodetector 22 is arranged to receive light from the 'B' and 'G' light sources 21 located to the left and right of the photodetector 22.
  • the photodetector 22 is arranged to receive light from more than two light sources 21 (described later in relation to Figures 5A - 5C ).
  • Figure 3 shows schematically a side view of a plurality of light sources 31 of a lighting apparatus in accordance with the present disclosure.
  • the plurality of light sources 31 may correspond to the light sources of an LED or OLED screen, as described previously.
  • the plurality of light sources 31 are attached to a surface 32.
  • the surface 32 may correspond, for example, to a portion of a panel of a display device, such as an LED or OLED display screen. It will be appreciated that the lighting apparatus will generally employ a larger number of light sources 31 than those shown in Figures 2 and 3 .
  • a reflective element 33 is shown as being located at a position above or in front of a location between at least two of the light sources 31.
  • the reflective element 33 is arranged to receive light from the at least two light sources 31, and to direct the received light to a photodetector 34 which is located on the surface 32 between the at least two light sources 31 and under the reflective element 33.
  • the reflective element 33 comprises a conical mirror 33, with the tip of the conical mirror being located closest to and pointing towards the surface 32 of the lighting apparatus.
  • the conical mirror 33 is suspended above the surface 32 of the lighting apparatus via a supportive element 35.
  • the supportive element 35 will generally have a small cross-sectional area so as to not obstruct the amount of light reaching the photodetector 34 located beneath the reflective element 33 (described below).
  • the conical mirror 33 and supportive element 35 may form one continuous shape.
  • the conical mirror 33 has an outwardly facing reflective surface for receiving light from at least two light sources 31.
  • the outwardly facing reflective surface may be straight (as shown) or curved (not shown). Indeed, the outwardly facing reflective surface may be other than conical and the shape may be adapted according to the number and location of the light sources from which light is to be received at the outwardly facing reflective surface.
  • the reflective element 33 will be made of a material that has a high reflectivity in the visible light spectrum.
  • the reflective element 33 may be made of a metal such as aluminium, silver, gold, etc.
  • the reflective element 33 may be made of an alloy that includes at least two of these metals.
  • the reflective element 33 will be made of a material that allows a large portion of the light received at the reflective element 33 to be directed to the photodetector 34.
  • the reflective element 33 may be arranged to receive light from more than two light sources 31.
  • the reflective element 33 may be associated with a region of light sources 31 from which light can be received at the reflective element 33.
  • This region of light sources 31 may include light sources 31 that are nearest neighbours to and / or next nearest neighbours to the reflective element 33 (or, equivalently, to the photodetector 34 associated with the reflective element 33).
  • This region of light sources 31 is indicated schematically in Figure 3 as receiving area 36.
  • the receiving area 36 indicates the region or area over which light can be received at the reflective element 33 from different light sources 31.
  • the reflective element 33 is arranged to receive light from at least three light sources 31 located either side of the reflective element 33 (i.e. in the horizontal direction). It will be appreciated that in some examples, the reflective element 33 may be arranged to receive light from a corresponding, or different, number of light sources 31 in a perpendicular direction (e.g. the vertical direction). It will be further appreciated that, in practice, different contributions of light will be received at the reflective element 33 from each of the light sources 31 that fall within the reflective element's receiving area 36.
  • the lighting apparatus comprises plural reflective elements 33 and correspondingly plural photodetectors 34.
  • the plural reflective elements 33 and photodetectors 34 may be distributed uniformly amongst the light sources 31 of the lighting apparatus.
  • each reflective element 33 and photodetector 34 may be spaced apart by three light sources 31 (as would be the case in Figure 2 ).
  • the positions of the reflective elements 33 and photodetectors 34 in a first row of light sources 31 may be offset from the positions of the reflective elements 33 and photodetectors 34 in a second row of light sources 31 (which may or may not be immediately above or below the first row), for example, by one or two light sources 31.
  • the reflective elements 33 and photodetectors 34 are distributed amongst the light sources 31 such that each reflective element 33 and photodetector 34 can receive light from a different respective group of light sources 31. In some examples, there may be some overlap between the different groups of light sources 31 from which each reflective element 33 and photodetector 34 are able to receive light.
  • the photodetector 34 is configured to detect an average luminance of the light that is received at the photodetector 34. This light corresponds to the combined light output (or a portion of the combined light output) of the two or more light sources 31 that are within the receiving area 36 of the reflective element 33. In additional or alternative examples, the photodetector 34 is configured to detect the colour (or an average colour) of the light that is received at the photodetector 34.
  • the photodetector 34 may employ any known mechanism for detecting the luminance and / or colour of the light received at the photodetector 34.
  • the detected luminance and/or colour of the light received at the photodetector 34 may be provided as an input to a controller (not shown).
  • the controller is configured to control the output of one or more of the light sources of the lighting apparatus, based on at least one of the luminance and colour of the light received at the photodetector 34.
  • the controller may be configured to determine whether a given region of light sources 31 is outputting light at an average intensity and / or with an average colour that deviates from a desired or expected average intensity and / or average colour.
  • the controller may, for example, adjust the intensity and / or average colour of light that is output by at least one group of light sources 31.
  • the group may be, for example, a group of light sources that are identified by the controller as being neighbours to the region of light sources 31 that are outputting light incorrectly (i.e. with an incorrect colour and / or intensity).
  • the controller may adjust the intensity and / or average colour of the light output by the light sources 31 that are identified as having an incorrect light output.
  • adjusting the intensity and / or average colour of light output by the light sources 31 may involve, for example, adjusting the intensity of light that is generated by the light sources 31.
  • the controller may be configured to control the intensity of light that is generated by the light sources. It will be appreciated that the controller may adjust the average colour of light that is output by the light sources 31 by varying individual contribution (i.e. intensity) of e.g. red, green or blue light that is output by each of the light sources 31.
  • the controller may comprise at least one processor for receiving the inputs from the photodetectors 34 and for determining an action that is to be performed, in response to the received input.
  • the at least one processor may be configured to retrieve computer program instructions stored in a memory, which when executed by the at least one processor, cause the controller to perform one or more of the operations described above.
  • the functionality of the controller may be performed by a single piece of hardware, software, or firmware.
  • the controller may be configured to determine the average luminance and / or colour of the light received at the photodetector, based on the inputs received from the photodetectors 34.
  • Figure 4 shows an example of a reflective element 33 and photodetector 34 comprising at least one diffusive layer 42A, 42B.
  • a diffusive layer 42A may be located in front of, i.e. overlay, the outward reflective surface of the reflective element 33. This diffusive layer 42A ensures for example, that the light incident at, and reflected from, the reflective element 33 is spread out more evenly over the surface of the photodetector 34. This prevents, for example, a spike in the intensity of light being localised to one specific portion of the photodetector 34.
  • the photodetector 34 may be associated with a diffusive layer 42B which overlies the photodetector 34.
  • This diffusive layer 42B may again help to spread light received from the reflective element 33 more evenly. This diffusive layer 42B may also ensure that e.g. any light reflected off the photodetector 34 is spread out over the screen of the display device, so as to not appear as an excessively bright spot on the screen.
  • the light sources 31 of the lighting apparatus may be arranged in a geometric pattern.
  • the light sources 31 are arranged in a regular rectangular array and the locations of the light sources 31 in the array may correspond to the nodes of the array.
  • the photodetector 34 is located at a position in the geometric pattern that would otherwise be reserved for one of the light sources 31.
  • the photodetector 34 is located at a position in the array corresponding to one of the nodes of the array. The photodetector 34 may therefore be thought of as replacing one of the light sources 31 in the array.
  • the photodetector 34 replaces one of the light sources of an LED or OLED display (which may be "sub-pixels", in the sense that each light source generates a specific colour for the pixel, such as red or green or blue).
  • the photodetector 34 occupies an area of the surface 32 that is comparable in size to the area occupied by an individual light source 31.
  • the size of the photodetector 34 is the same as the size of a light source 31.
  • the size of the photodetector is such that a substantial portion of the light reflected from the reflective element 33 can be received (and detected) at the photodetector 34.
  • FIG 5A - 5C schematically shows an example of a display device 50 and the organisation of light sources within the display device 50.
  • the display device 50 employs the lighting apparatus described previously.
  • the display device 50 comprises a plurality of panels 51, with each panel 51 comprising a plurality of modules 52. It will be appreciated that in some examples, the display device 50 may employ just one continuous panel 51.
  • Each module 52 comprises a plurality of light sources. In one example, each module 52 comprises an 18 x 18 grid of light sources.
  • FIG 5A only some of the panels 51 and their associated modules 52 are shown.
  • the panels 51 may be arranged in a regular array, with equal spacing between each of the panels 51.
  • the modules 52 within a panel 51 may be arranged in a regular array, with equal spacing between each of the modules 52.
  • the individual panels 51 may be connectable to and detachable from one another.
  • the modules 52 within a given panel 51 may also be attachable to and removable from the panel 51. This means, for example, that a panel 51, or a module 52 within a panel 51, can be replaced, without all of the panels 51, or all of the individual modules 52 within the panel 51, having to be replaced. Hence, faulty groups of light sources can be removed and replaced by e.g. a technician more easily.
  • FIG. 5B shows schematically one of the modules 52 within a given panel.
  • the module 52 comprises a plurality of light sources 53.
  • the light sources 53 in Figure 5B are grouped into different respective regions 54.
  • the regions 54 shown in Figure 5B correspond to regions of light sources 53 for which light can be received at a respective reflective element (not shown).
  • the reflective element will be located at the centre of its associated region 54.
  • the regions 54 associated with the reflective elements are not the same for each reflective element.
  • the size and shape of the regions 54 may vary for the different reflective elements. This may be a result, for example, of the detailed shape and / or orientation of the reflective element.
  • each reflective element may be arranged to receive light from a uniform region 54 of light sources 53, such as the light sources 53 that are within a predetermined radius of the reflective element. This radius may include, for example, the light sources 53 that are nearest neighbours to, and / or next nearest neighbours to the photodetector associated with the reflective element.
  • Figure 5C shows a subset of the plurality of light sources 53 shown in Figure 5B .
  • a reflective element 55 with an associated region of light sources 54 is shown.
  • the associated region 54 of light sources 53 corresponds to the light sources 53 from which light may be received at the reflective element 55.
  • the lateral extent of the reflective element 55 (when viewed from above) may extend over a light source 53.
  • the lateral extent of the reflective element extends outwardly along the horizontal direction beyond the location of the corresponding photodetector 56.
  • the photodetector 56 is shown as having the size of a light source 53 and being located beneath the reflective element 55.
  • the reflective element 55 may extend in the vertical direction beyond the location of the corresponding photodetector 56.
  • processor or processing system or circuitry referred to herein may in practice be provided by a single chip or integrated circuit or plural chips or integrated circuits, optionally provided as a chipset, an application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), digital signal processor (DSP), graphics processing units (GPUs), etc.
  • the chip or chips may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or processors, a digital signal processor or processors, baseband circuitry and radio frequency circuitry, which are configurable so as to operate in accordance with the exemplary embodiments.
  • the exemplary embodiments may be implemented at least in part by computer software stored in (non-transitory) memory and executable by the processor, or by hardware, or by a combination of tangibly stored software and hardware (and tangibly stored firmware).

Landscapes

  • Electroluminescent Light Sources (AREA)
  • Details Of Measuring Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Claims (10)

  1. Appareil d'éclairage comportant :
    une pluralité de sources de lumière (31) servant à émettre de la lumière ;
    une pluralité d'éléments réfléchissants (33) ; et
    une pluralité de photodétecteurs (34) ;
    les sources de lumière (31) étant situées en différents emplacements respectifs sur une surface (32) ;
    chaque élément réfléchissant (33) étant agencé pour recevoir de la lumière émise par au moins deux de la pluralité de sources de lumière (31) et pour diriger la lumière reçue sur un photodétecteur (34) correspondant, chaque élément réfléchissant (33) étant agencé pour recevoir de la lumière en provenance d'un groupe respectif différent de sources de lumière de la pluralité de sources de lumière (31) ; et
    chaque photodétecteur (34) étant situé au niveau d'un emplacement sur la surface (32) qui est entre les emplacements desdites au moins deux sources de lumière (31) ;
    caractérisé en ce que :
    chacun des éléments réfléchissants (33) comporte un miroir conique (33) ayant une surface réfléchissante orientée vers l'extérieur pour recevoir de la lumière en provenance desdites au moins deux sources de lumière (31) et qui est suspendu au-dessus de la surface (32) par le biais d'un élément de support respectif (35).
  2. Appareil d'éclairage selon la revendication 1, dans lequel chaque photodétecteur (34) est configuré pour détecter au moins l'une parmi la couleur et la luminance de la lumière émise par lesdites au moins deux sources de lumière (31).
  3. Appareil d'éclairage selon la revendication 1 ou la revendication 2, dans lequel chaque photodétecteur (34) est configuré pour mesurer une luminance moyenne de lumière reçue en provenance desdites au moins sources de lumière (31) qui sont les plus proches voisines du photodétecteur (34).
  4. Appareil d'éclairage selon la revendication 3, dans lequel chaque photodétecteur (34) est configuré pour mesurer une luminance moyenne de lumière reçue en provenance desdites au moins sources de lumière (31) qui sont les plus proches voisines ou les plus proches voisines suivantes du photodétecteur (34).
  5. Appareil d'éclairage selon l'une quelconque des revendications 1 à 4, dans lequel chaque photodétecteur (34) comporte une couche diffuse, la couche diffuse recouvrant une surface du photodétecteur (34) dont l'agencement permet de recevoir de la lumière.
  6. Appareil d'éclairage selon l'une quelconque des revendications 1 à 5, dans lequel chaque élément réfléchissant (33) comporte une couche diffuse (42A), la couche diffuse (42A) recouvrant une surface réfléchissante orientée vers l'extérieur de l'élément réfléchissant (33).
  7. Appareil d'éclairage selon l'une quelconque des revendications 1 à 6, dans lequel les sources de lumière de la pluralité de sources de lumière (31) sont agencées en un réseau régulier, les sources de lumière (31) et chaque photodétecteur (34) étant situés au niveau de nœuds du réseau.
  8. Appareil d'éclairage selon l'une quelconque des revendications 1 à 7, comportant un dispositif de commande, le dispositif étant couplé aux photodétecteurs de la pluralité de photodétecteurs (34), le dispositif de commande étant configuré pour commander la sortie des sources de lumière de la pluralité de sources de lumière (31) en se basant sur des entrées reçues en provenance des photodétecteurs respectifs (34).
  9. Appareil d'éclairage selon l'une quelconque des revendications 1 à 8, dans lequel chaque source de lumière (31) est une diode électroluminescente inorganique ou organique.
  10. Dispositif d'affichage (50) comportant un appareil d'éclairage selon l'une quelconque des revendications 1 à 9, la pluralité de sources de lumière (31) étant en mesure d'être commandées de manière à amener une image à être affichée sur un écran d'affichage du dispositif d'affichage (50).
EP17201953.1A 2017-11-15 2017-11-15 Appareil d'éclairage pour an dispositif d'affichage Active EP3487265B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17201953.1A EP3487265B1 (fr) 2017-11-15 2017-11-15 Appareil d'éclairage pour an dispositif d'affichage
TR2017/19137A TR201719137A2 (tr) 2017-11-15 2017-11-29 Bi̇r aydinlatma aparati ve görüntü ci̇hazi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17201953.1A EP3487265B1 (fr) 2017-11-15 2017-11-15 Appareil d'éclairage pour an dispositif d'affichage

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Publication Number Publication Date
EP3487265A1 EP3487265A1 (fr) 2019-05-22
EP3487265B1 true EP3487265B1 (fr) 2022-04-06

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7521667B2 (en) * 2003-06-23 2009-04-21 Advanced Optical Technologies, Llc Intelligent solid state lighting
JP4988586B2 (ja) * 2004-11-19 2012-08-01 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ セグメント化された光センサ上の画像マッピングによる光学的フィードバックを備えるｌｅｄ照明装置
JP2011522371A (ja) * 2008-05-29 2011-07-28 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 照明システムを制御する制御情報
TW201225740A (en) * 2010-12-14 2012-06-16 Hon Hai Prec Ind Co Ltd Led light source module
US8729823B2 (en) * 2011-12-29 2014-05-20 Osram Opto Semiconductors Gmbh Regulating systems
US8755039B2 (en) * 2012-05-03 2014-06-17 Abl Ip Holding Llc Lighting devices with sensors for detecting one or more external conditions and networked system using such devices
DE102012209131A1 (de) * 2012-05-31 2013-12-05 Osram Gmbh Leuchtvorrichtung mit halbleiterlichtquellen und gemeinsamem diffusor

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TR201719137A2 (tr) 2019-06-21
EP3487265A1 (fr) 2019-05-22

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