EP2321699A1 - Projecteur à del - Google Patents

Projecteur à del

Info

Publication number
EP2321699A1
EP2321699A1 EP09736803A EP09736803A EP2321699A1 EP 2321699 A1 EP2321699 A1 EP 2321699A1 EP 09736803 A EP09736803 A EP 09736803A EP 09736803 A EP09736803 A EP 09736803A EP 2321699 A1 EP2321699 A1 EP 2321699A1
Authority
EP
European Patent Office
Prior art keywords
leds
led
conductor tracks
projector according
pixel
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.)
Withdrawn
Application number
EP09736803A
Other languages
German (de)
English (en)
Inventor
Stefan GRÖTSCH
Ewald Karl Michael GÜNTHER
Alexander Wilm
Siegfried Herrmann
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.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP2321699A1 publication Critical patent/EP2321699A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources

Definitions

  • the following invention relates to a projection system whose imager comprises an array of light-emitting diodes.
  • Projection systems are usually implemented using discharge lamps that have a high power consumption and a short life.
  • LED projectors with significantly longer life and more efficient operation.
  • a disadvantage of the LED projectors are the lower light output due to the light sources used here and losses in the optical system.
  • the light emanating from the light source is mixed, homogenized and divided into the colors red, green and blue by means of a color wheel. The light of each color is projected onto the imaging element.
  • Typical imagers are an arrangement of LCDs (liquid crystal displays), LCoS (Liquid Crystal on Silicon) or DLP (Digital Light Processing) with an arrangement of small folding mirrors.
  • Polarization based systems with LCDs or LCoS use only one direction of polarization.
  • the images are superimposed sequentially so that each light source of a given color is turned on only intermittently. Therefore, even here, the light output of the light source is not fully utilized.
  • DE 199 25 318 C1 describes a color image projector with time-controlled LED light sources.
  • WO 03/056876 A2 describes a lighting system with planar multilayer arrangements of LED light sources.
  • US 2008/0211413 A1 describes a display device made of LEDs.
  • DE 100 63 200 A1 describes a method and a device with LCD incident light modulators.
  • EP 1 609 835 A1 describes a potting compound for LEDs.
  • Object of the present invention is to provide a projection system with high life and high efficiency despite low overall height.
  • an array of LED chips is used, which are mounted on a support and interconnected.
  • the carrier may preferably be silicon, since both data and power lines can be realized in a silicon carrier.
  • a pixel is preferably formed in color rendering from an array of red, green, and blue LED light sources.
  • the LEDs are stacked epi-LEDs which have layers arranged one above another for different colors, or each pixel of the LED projector has a radiating surface in which at least two LEDs are arranged next to one another.
  • the contacting can only take place from the underside of the carrier done or z.
  • ITO indium tin oxide
  • the number of pixels and thus the number of LEDs is determined by the desired resolution of the projector. A particularly high resolution with small dimensions is achieved with stacked Epi LEDs, in which the layers provided for the different colors are epitaxially grown one above the other. One pixel corresponds to a layer stack of a single LED, so that all colors of a respective pixel are emitted by the same emission surface of the relevant LED chip.
  • FIG. 1 shows a plan view of an LED array.
  • FIG. 2 shows an arrangement of stacked epi-LEDs on a carrier in a perspective view.
  • FIG. 3 shows a schematized view according to FIG. 2 for an embodiment with bonding wires.
  • FIG. 4 shows the underside of an embodiment with bottom-side terminal contact surfaces.
  • FIG. 5 shows a carrier with conductor tracks for row addressing in a perspective view.
  • FIG. 6 shows a glass sheet with conductor tracks for row addressing and column addressing in a perspective top view.
  • FIG. 7 shows a glass sheet with strip conductors for column addressing in a perspective bottom view.
  • FIG. 8 shows a cross section through a multilayer arrangement of LED layers between transparent intermediate layers.
  • FIG. 9 shows an arrangement of LED chips of an embodiment according to FIG. 8 in a plan view.
  • FIG. 1 shows a plan view of an embodiment with a grid-like arrangement of pixels 1, each of which has a Abstrahltlache, in each of which a plurality of LEDs are arranged side by side, in this example four LEDs 2.
  • Each LED 2 can be arranged on a separate chip be. For any color mix, LEDs are sufficient for red, green and blue light. In the example shown in Figure 1, four square LEDs are provided in each pixel, two of which are for green light.
  • the LED projector can be adapted to different applications, for example for monochrome images or for multi-color images, with suitably selected LEDs in the pixels.
  • An addressing of a pixel for operating the LEDs or LEDs arranged therein is effected by the electrical control of an associated crossing point of a conductor track made of a plurality of conductor tracks for row addressing and a conductor track of a plurality of conductor tracks for column addressing.
  • a conductor track 3 schematically indicated for row addressing and a track 4 for column addressing with dashed lines.
  • the arrangement of the conductor tracks and the thus provided contacting the light-generating layers is not fixed in principle, but can be configured differently depending on the technology.
  • FIG. 2 shows a further exemplary embodiment in which the layers of the LEDs provided for the generation of light are arranged one above the other in each pixel 1 as a layer stack.
  • the relevant LEDs may in particular be stacked epi-LEDs, in which the layers provided for the generation of light are epitaxially grown on top of each other and form a stack.
  • On a support 5 is an array of layer stacks 6, d. h., A plurality of arranged in a grid layer stacks 6, each forming a pixel 1.
  • the arrangement with stacked Epi LEDs has the particular advantage that the lateral dimensions can be kept low and thus a high resolution of the projector is achieved.
  • the same radiating surface is used, which is formed by the top of the respective layer stack 6.
  • the electrical connections and addressing conductor tracks can be arranged at least partially on the upper side or completely within the carrier 5.
  • FIG. 3 shows a further embodiment in which LEDs 2 are arranged on the upper side of a carrier 5 in a grid of pixels, it being left open in the schematic representation of FIG. 3 whether these are layer stacks or monochromatic LEDs arranged next to one another ,
  • bonding wires 7 are provided, which are connected to associated, intersecting tracks for the row addressing and column addressing of the LEDs of the array.
  • the conductor tracks are not shown in FIG. 3, since they are covered by the array of LEDs or arranged inside the carrier 5; the conductor tracks can be arranged on the upper side of the carrier 5 between the carrier 5 and the LEDs 2 or, in particular in the case of a carrier made of silicon, run inside the carrier. It can also strip conductors on the side facing away from the carrier 5 top of the LEDs 2 are arranged, if this is a transparent and electrically conductive material, for.
  • ITO indium tin oxide
  • FIG. 4 shows an alternative embodiment in which rear side contacts 8 for the electrical connection are provided on the rear side of the carrier 5. If transparent conductor tracks for the electrical connection are present on the front side, it is sufficient in each case one rear-side contact 8 for each LED; but it is also possible to provide the entire electrical contact on the back of the carrier 5 and to arrange for this purpose two or more backside contacts 8 for each pixel or for each LED or LED layer.
  • Such a projector can also be built up by placing substrateless semi-transparent chips with LEDs on glass foils one above the other.
  • the power supply in the provided for the different colors layer planes is preferably carried out by means of metal contacts, which are provided with conductor tracks, for. B. from ITO combined.
  • Each pixel is located at the intersection of a column and a row of the array along which each transparent traces run, the arranged on the glass sheets of the stack or embedded in the glass sheets.
  • FIG. 5 shows, in a perspective top view, a carrier 5 on which strip conductors 3 for row addressing are applied.
  • the respective LED chips are arranged on these strip conductors, and the respective terminal contact area of each LED chip is electrically conductively connected to the associated strip conductor 3.
  • a glass sheet according to Figure 6 is arranged, which is provided on the underside with interconnects 4 for the column addressing and the top side with further interconnects 3 for the row addressing.
  • the glass sheet 9 which is shown in FIG. 6 in a perspective view corresponding to FIG. 5, is placed over the array of LED chips on the support 5, the dashed arrows pointing downwards in FIGS. 5 and 6 pointing at points are, which come to lie vertically above each other. By means of these arrows, the relative orientation of the various levels of the arrangement can thus be recognized.
  • the lower-side conductor tracks 4 for the column addressing are electrically conductively connected to the respective terminal contact surfaces of the LED chips on the carrier 5.
  • FIG. 7 shows, in a perspective bottom view, a further glass foil 9 which is arranged at the top in the stack, in such a way that the points marked with the dashed arrows pointing downwards in FIG. 7 are vertically aligned with those in FIG Marked points come to rest, so the points are aligned along the arrows.
  • FIG. 8 shows a cross-section of a preferred embodiment in which the electrical connection between the connection contacts of the LEDs and the conductor tracks takes place in each case via metal frame contacts 10.
  • multiple layers of arrays of LED chips 14 are shown.
  • On the carrier 5 is a first LED layer 11 for a first color.
  • On it is a glass sheet 9, on which a second LED layer 12 is arranged for a second color.
  • This top third LED layer 13 is covered on the top side with a glass sheet 9.
  • Between the glass sheets and the LED chips are thin strip conductors, which may for example be designed according to the illustrations in Figures 5, 6 and 7 and because of their small thickness in of Figure 8 are not shown.
  • Metal frame contacts 10 are provided between these printed conductors and the electrical connections of the LEDs.
  • metallic connections between the metal frame contacts 10 are provided, which may be formed, for example, by thin metal strips 16.
  • the conductor tracks 3, 4 are connected via the metal frame contacts 10 with the connection contacts of the LEDs.
  • the metal frame contacts 10 may be interconnected along the conductor tracks 3, 4 by means of metal strips 16.
  • the metal strips 16 running along the conductor tracks can be seen in the cross section of FIG. 8 only in the case of the lower conductor tracks 3 running in the plane of the drawing.
  • corresponding metal strips can also be provided for the upper conductor tracks 4 arranged on the respective upper sides of the LED chips and run between the upper metal frame contacts 10 parallel to the upper conductor tracks 4 perpendicular to the plane of the drawing.
  • the metal frame contacts 10 on the upper sides of the LED chips are therefore separated from one another in the plane of the cross section of FIG.
  • the LED layers 11, 12, 13 may, for. B. be provided for red, green and blue light. It is instead also possible, for example, for the purpose of better color mixing, at least one further LED layer of a suitable color or to provide only a single LED layer for monochrome reproduction.
  • the order of arrangement of the colors in the stack of LED layers and glass foils is basically arbitrary.
  • FIG. 9 shows how the metal frame contacts 10 are arranged on the LED chips 14, which are separated from each other by narrow gaps 15.
  • the conductor tracks 4 for the column addressing run from top to bottom. They are connected via the metal frame contacts 10 to the LED chips 14.
  • the metal frame contacts 10 are connected to each other by metal strips 16.
  • the existing on the undersides of the LED chips 14 strip conductors 3 for the row addressing are hidden by the LED chips.
  • the lower metal strips 16 are shown in dashed lines in FIG. 9, which extend in the same direction as the line paths 3 for the row addressing.
  • a projector whose pixels are each formed by LEDs, also allows to improve the contrast of a generated image by the dark within the generated image LEDs are switched as photodetectors. This is done by applying a voltage in the reverse direction to the pn junction of the light-generating layer of the relevant LED. In this mode, the electron-hole pairs generated by the incident light are electrically isolated from each other and provide a photocurrent. The LED thus absorbs incident light and appears darker than a non-reverse operated LED.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Led Device Packages (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne un projecteur à DEL dans lequel chaque point d'image (1) présente une DEL à empilement de couches épitaxiales ou au moins deux DEL (2) adjacentes en tant que source de lumière. Un adressage des DEL peut s'effectuer par des pistes conductrices (3) assurant l'adressage des lignes et des pistes conductrices (4) assurant l'adressage des colonnes, les DEL à faire fonctionner se trouvant aux point d'intersection correspondants.
EP09736803A 2008-09-11 2009-09-09 Projecteur à del Withdrawn EP2321699A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008046762.6A DE102008046762B4 (de) 2008-09-11 2008-09-11 LED-Projektor
PCT/DE2009/001270 WO2010028637A1 (fr) 2008-09-11 2009-09-09 Projecteur à del

Publications (1)

Publication Number Publication Date
EP2321699A1 true EP2321699A1 (fr) 2011-05-18

Family

ID=41651533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09736803A Withdrawn EP2321699A1 (fr) 2008-09-11 2009-09-09 Projecteur à del

Country Status (7)

Country Link
US (1) US8733950B2 (fr)
EP (1) EP2321699A1 (fr)
JP (1) JP5713902B2 (fr)
KR (1) KR20110074841A (fr)
CN (1) CN102047177B (fr)
DE (1) DE102008046762B4 (fr)
WO (1) WO2010028637A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008025160A1 (de) * 2008-05-26 2009-12-03 Osram Opto Semiconductors Gmbh Projektor für kleinste Projektionsflächen und Verwendung einer Mehrfarben-LED in einem Projektor
DE102011087887A1 (de) * 2011-12-07 2013-06-13 Osram Gmbh Leuchtdiodenanordnung
CN104465692B (zh) * 2014-12-04 2017-08-25 中国科学院半导体研究所 一种led全彩显示阵列及其制作方法
KR102629584B1 (ko) * 2016-07-19 2024-01-25 삼성전자주식회사 빔 조향 백라이트 유닛 및 이를 포함하는 홀로그래픽 디스플레이 장치
US10191360B2 (en) * 2016-12-30 2019-01-29 Hong Kong Beida Jade Bird Display Limited Microarray LED flash
KR20180109220A (ko) 2017-03-27 2018-10-08 주식회사 루멘스 Led 디스플레이 장치
CN109634043B (zh) * 2019-02-22 2020-08-28 中国科学院福建物质结构研究所 一种激光发射单元以及激光投影光源

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Also Published As

Publication number Publication date
JP5713902B2 (ja) 2015-05-07
WO2010028637A1 (fr) 2010-03-18
CN102047177B (zh) 2012-07-18
US20110176116A1 (en) 2011-07-21
US8733950B2 (en) 2014-05-27
DE102008046762A1 (de) 2010-03-18
JP2012502489A (ja) 2012-01-26
CN102047177A (zh) 2011-05-04
KR20110074841A (ko) 2011-07-04
DE102008046762B4 (de) 2020-12-24

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