WO2012156860A1 - Dispositif émetteur de lumière pour moniteur/afficheur lcd à éclairage périphérique ou à éclairage direct - Google Patents

Dispositif émetteur de lumière pour moniteur/afficheur lcd à éclairage périphérique ou à éclairage direct Download PDF

Info

Publication number
WO2012156860A1
WO2012156860A1 PCT/IB2012/052254 IB2012052254W WO2012156860A1 WO 2012156860 A1 WO2012156860 A1 WO 2012156860A1 IB 2012052254 W IB2012052254 W IB 2012052254W WO 2012156860 A1 WO2012156860 A1 WO 2012156860A1
Authority
WO
WIPO (PCT)
Prior art keywords
leds
parameter
clusters
cluster
variation
Prior art date
Application number
PCT/IB2012/052254
Other languages
English (en)
Inventor
Marcus Jozef Henricus Kessels
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 WO2012156860A1 publication Critical patent/WO2012156860A1/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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light sources

Definitions

  • LED Light emitting diode
  • edge-lit or direct-lit TV's and monitors multiple LEDs are used to create the required amount of light.
  • kitting is a process in which the characteristics of a plurality of LEDs are measured and LEDs of the same color, brightness or any parameter, or LEDs falling within a specific interval for a specific parameter, are classified as belonging to the same "bin". LEDs from matching bins are combined when used in a fixture or a TV.
  • Kitting is a process for obtaining a homogeneous color distribution in which LEDs of different color bins are more or less homogenously distributed over an array.
  • a LED with a high flux may be combined with a led with a low flux to ensure that the average meets a specification of interest.
  • the same can be done for color.
  • LEDs with a high v' (a coordinate in color space CIE 1976) may be combined with an LED with low v', and again the mix could meet a desired specification.
  • An example of such a binning and kitting approach is described in US 7 201 493.
  • a light emitting device comprising a plurality of LEDs arranged in clusters.
  • each LED has an operating parameter or characteristic X; and each cluster has a corresponding operating parameter or characteristic Y j .
  • Y j is the combined effect of all Xi of the LEDs in a cluster and the clusters and LEDs are arranged such that the distance between two LEDs within a cluster is smaller than the distance between two adjacent clusters, the variation in Y j between clusters is smaller than the variation in Xi between the LEDs of the device, and a ratio B/A is below about 0.55*M ⁇ 1 -5 wherein the parameter "A” relates to the variation in Xi among the plurality of LEDs, the parameter "B” relates to the variation in Y j among the clusters and the parameter "M” is the number of LEDs in each cluster.
  • variation refers to any measured parameter that relates to the spread or variation between Xi or Y j .
  • the variation could thus for example be, or be related to, the variance, the standard deviation or root mean square deviation.
  • the variation is the standard deviation of the Xi and Y j , respectively.
  • the device comprises N LEDs and N' clusters, then l ⁇ i ⁇ N and 1 ⁇ j ⁇ N' . If there is M LEDs in each cluster, then N -N/M and l ⁇ i ⁇ N and 1 ⁇ j ⁇ N/M.
  • the "operating parameter or characteristic” refers to any electrical and/or optical operating parameter or characteristic of a LED or a cluster of LEDs, such as color coordinate, flux, forward voltage, etc.
  • the first aspect of the invention is thus based on the general idea of arranging LEDs in clusters instead of distributing them evenly on an array when used in for example a fixture, LCD-screen or TV.
  • the cluster of LEDs may then act as a single light source with improved properties, such as improved color, flux etc compared to a single LED.
  • the parameter or data of the individual LEDs have been utilized for forming the light emitting device, i.e. traditional binning methods are not required for distributing the LEDs of the device. Thus, tracking the individual measured
  • characteristics of LEDs instead of the conventional binning methods allows arranging the LEDs in clusters according to the first aspect of the invention such that the homogeneity of parameters over the array of clusters is increased.
  • the first aspect of the invention is based on the idea that LEDs having complementary properties, such as complementary colors or brightness values, are clustered.
  • Clusters having equal color and brightness are spaced at a larger distance from each other and the LEDs are put at a smaller distance from each other within a cluster compared to the distance between clusters.
  • the distance between clusters could be at least two times larger than the distance between LEDs in a cluster, such as at least three times larger, such as at least four times larger, such as at least five times larger, such as at least ten times larger, such as at least twenty times larger, than the distance between LEDs in a cluster.
  • the properties of a cluster is the combined, or mixed, effect of the properties of the individual LEDs of that cluster.
  • LEDs are further arranged such that the variation in an operating parameter or characteristic between clusters is smaller than the variation in the corresponding operating parameter or characteristic between all LEDs of the device.
  • the inventor has found that a ratio of B/A below about 0.55* ⁇ 1-5 ⁇ results in a light emitting device or array with improved homogeneity in for example color and brightness.
  • the parameter "A” could for example be the variation in X; or be proportional to the variation in X;.
  • the parameter "B” could be the variation in Y j or be proportional to the variation in Y.
  • the inventor has found that it is advantageous that the ratio B/A depends on the LED count "M" in a cluster.
  • the ratio B/A is below about 0.50*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.45*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.35*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.33*M ( ⁇ 1 5) .
  • the first aspect of the invention is advantageous since it provides for displays with a very low LED count and with improved uniformity. Thus, the homogeneity in e.g. color or brightness over the device or array is increased.
  • the first aspect of the invention provides a light emitting device having less spread in specific parameter values compared to a light emitting device in which LEDs are distributed according to conventional bin and kitting methods.
  • the clusters may be arranged in positions forming an array.
  • An array refers to a systematic arrangement, usually in rows or columns.
  • the clusters may for example form a one-dimensional array, i.e. a row, or a two-dimensional array, e.g. several rows and columns.
  • the array may be a regular or an irregular array.
  • the operating parameter or characteristic X may be selected from the forward voltage V f , the flux ⁇ , a color parameter and the brightness of a LED.
  • the flux ⁇ refers to the luminous flux of the LED and is often used as an objective measure of the useful power emitted by a light source.
  • Y j is the proper sum or mixed effect of the characteristic X; of the LEDs in a cluster.
  • Y j is thus the operating parameter or characteristic of the cluster that corresponds to the operating parameter or characteristic X; of a single LED.
  • X is the flux ⁇
  • Y is the arithmetic sum of the individual fluxes of the LEDs in a cluster.
  • V f forward voltage
  • Y is the sum of the individual forward voltages of the LEDs in a cluster.
  • the color parameter may be the color coordinate of a color point.
  • a "color point” refers to a point in a color spectral chart, for example represented by a set of x and y coordinates in a CIE 1931 spectral chart and/or by u', v' coordinates from the 1976 CIE diagram.
  • a "color coordinate” thus refers to a coordinate in a color chart, such as x, y, u', v'.
  • a further example of a color point is a point in a RGB color chart.
  • a color coordinate may thus also be a R, G or B value in a RGB color chart.
  • the "tristimulus values" of a color refers to the amounts of three primary colors in a three-component additive color model needed such that the mixed color of the tristimulus values matches the color or a color coordinate of a color chart.
  • the color parameter may also be at least one tristimulus value of the color of a LED.
  • Y j is the color point which results from converting the color points of all LEDs in a cluster to individual tristimulus values, summing the individual tristimulus values accordingly and then converting the summed tristimulus values back to a color point.
  • a cluster comprises a first LED with color point Xi and a second LED with color point X 2 , these color points are converted into tristimulus values (xn, x 12 , x 13 ) and (x 21 , x 22 , x 23 ).
  • the tristimulus values are summed to form a set of summed tristimulus values (xn+x 21 , xi 2 +x 22 , xi 3 +x 23 ) and this set is converted into a color point to get the Y value for the cluster.
  • Methods for converting color points to tristimulus values, and vice versa, are known in the art and therefore not further described herein.
  • X is a coordinate, e.g. u', v' coordinates from the 1976 CIE diagram
  • Y is calculated as described above for the case when X is a color point.
  • the parameter "A" is better described as a weighted average in a variation or as a maximum variation.
  • the LEDs of the device may have “n” different colors and a parameter "A n " may be calculated for each color, wherein “A n " relates to the variation in the X; that are associated with a color.
  • the parameter "A” may then be selected as the average of all “A n “ or the maximum of each "A n ".
  • the LEDs of the device could be a mix of red (R), green (G) and blue (B) LEDs.
  • the parameter "Ai” is calculated for the red (R) LEDs
  • the parameter “A 2” is calculated for the green (G) LEDs
  • the parameter "A 3 " is calculated for the blue (B) LEDs.
  • the parameter "A” could then be defined as the average of parameters “Ai”, “A 2 “ and “A 3 " or the maximum of parameters “Ai", “A 2 “ and “A3”.
  • the definition of the parameter “B” thus depends on how the parameter “A” is calculated, such that the parameter “B” relates to the corresponding variation between clusters. In the example above, if the maximum variation in R, G and B between LEDs is in R and the parameter "A" is selected as the variation in R, then the parameter “B” is selected as the similar variation in R between clusters. It will be appreciated that the parameter “B” may be calculated based on how the parameter "A” is calculated.
  • the device comprises LEDs of red (R), green (G) and blue (B) colors.
  • the device comprises LEDs of green (G) and purple (P) colors. It may be advantageous to calculate the parameter "A" when the device comprises LEDs of green (G) and purple/pink (P) colors with the same approach as described above when LEDs of red (R), green (G) and blue (B) colors are used.
  • the device may comprise a total of N LEDs with M LEDs in each cluster, and the parameter "A" and the parameter "B" may be defined as
  • X is the mean of all Xi, i.e.
  • the pa ra meter - A » reflects the variation in Xi between N number of LEDs of the light emitting device and the parameter "B" reflects the variation in Y j between all clusters of the light emitting device.
  • the light emitting device may comprise a total of N LEDs with
  • an edge-lit or direct-lit LCD monitor comprising the light emitting device according to any one of the embodiments described above.
  • the present embodiment is advantageous in that it provides monitors having an increased homogeneity in terms of e.g. color and brightness.
  • edge-lit lighting fixtures comprising the light emitting device according to any one of the embodiments described above.
  • the present embodiment is advantageous in that it provides lighting fixtures having an increased homogeneity in terms of e.g. color and brightness.
  • a method of distributing a plurality of LEDs in an array of clusters comprises arranging the LEDs with "M" LEDs in each cluster such that the distance between the LEDs within a cluster is smaller than the distance between two adjacent clusters and the variation of an operating parameter or characteristic Y j between clusters is smaller than the variation of an operating parameter or characteristic Xi between all LEDs in the array, wherein Y j is the combined effect of all Xi of the LEDs in a cluster, and wherein a parameter "A” relates to the variation in Xi among the plurality of LEDs and a parameter "B” relates to the variation in Y j among the clusters and the ratio B/A is below about 0.55* ⁇ 1-5 ⁇
  • the terms and definitions used in the second aspect of the invention are the same as discussed in relation to the other aspects of the invention above.
  • a method according to the second aspect provides for a more uniform display at a very low
  • the ratio B/A is below about 0.50*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.45*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.35*M ( ⁇ 1 5) .
  • the ratio B/A is below about 0.33*M ( ⁇ 1 5) .
  • the method does not comprise binning of LEDs before distributing the plurality of LEDs in an array of clusters.
  • tracking the individual measured characteristics of LEDs and using the individual data for each LED does not require conventional binning methods for distributing the LEDs over an array of clusters. This allows arranging the LEDs in clusters such that the homogeneity of parameters over the array of clusters is increased.
  • Fig. la shows a conventional lightbar assembly (prior art) in which LEDs are distributed in a one-dimensional array.
  • Fig. lb shows a lightbar assembly according to an embodiment of the present invention.
  • Fig. la shows a conventional lightbar assembly as known in the prior art.
  • LEDs in this case 54 LEDs defined by operating parameterers X1-X54 (e.g. the fluxes ⁇ - ⁇ 54), are distributed at different array positions.
  • the distance or spacing between the different LEDs is constant (Di). Due to improved efficiency of each single LED, the number of LEDs is relatively low, or at least has decreased as compared to devices using less efficient LEDs in terms of light output, which in turn means that the distance Di is relatively large.
  • the light from the LEDs are not sufficiently mixed, i.e. there is not enough overlap of the light beams from the LEDs in the lightbar assembly. Consequently, individual colors from the different LEDs become visible to the user or viewer of the lightbar assembly, e.g. if it is mounted in a fixture or a display.
  • Fig. lb shows a lightbar assembly according to an exemplifying embodiment of the present invention.
  • the lightbar assembly comprises 54 LEDs, i.e. the same number of LEDs as the lightbar assembly of Fig. la, which are defined by operating parameters X1-X54.
  • the 54 LEDs are, according to the present embodiment, distributed in 27 clusters with two LEDs in each cluster.
  • the clusters and LEDs are distributed such that the distance between the LEDs in each cluster (d) is smaller than the distance between two adjacent clusters (D 2 ). In other words, the distance between two LEDs of a cluster is smaller than the distance from that cluster to any other cluster of the device (lightbar).
  • Each cluster of LEDs acts a single light source defined by operating parameters Y1-Y27.
  • the operating parameter Xi may be the flux ⁇ ; of each LED, which means that Yi is the sum of the fluxes from the first two LEDs, i.e. ⁇ + ⁇ 2 , and Y 2 is the sum of the fluxes from the next two LEDs, i.e. ⁇ 3 + ⁇ 4, etc.
  • the LEDs provided with complementary colors and/or brightness levels and the LEDs are distributed in the clusters such that the variation in Y j between clusters is smaller than the variation in Xi between the LEDs of the device.
  • the characteristic or operating parameter X n is the flux ⁇ ⁇
  • the variation in the flux between the LEDs of the lightbar assembly is calculated as
  • the LEDs and clusters are distributed such that the ratio of B/A is below about preferably below 0.45*M ⁇ ⁇
  • the parameter "M" is the number of LEDs in each cluster and is in this case 2.
  • Such a ratio of B/A leads to a more homogeneous properties, e.g. a more homogeneous flux, over the entire area or extension of the lightbar assembly compared to the prior art lightbar assembly of Fig. la.
  • the lightbar assembly could be a two-dimensional array of columns and rows of clusters of LEDs.
  • such a two-dimensional array having LEDs distributed according to the present invention would have a more homogenous flux compared to prior art two-dimensional arrays in which LEDs are distributed according to conventional binning and kitting methods.
  • each cluster needs to have the same number of LEDs M.
  • the clusters may have a different number of LEDs, such that cluster j may comprise M j LEDs.
  • clusters near the ends of the lightbar or near the sides of an areal fixture or display may have a different number of LEDs than the clusters in the middle of the lightbar or fixture.
  • the formulas for parameter 'B' will have to be adjusted accordingly.

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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention concerne un dispositif émetteur de lumière comprenant une pluralité de DEL agencées en grappes, chaque DEL possédant un paramètre ou une caractéristique de fonctionnement Xi et chaque grappe possédant un paramètre ou une caractéristique de fonctionnement correspondant(e) Yj. Yj est l'effet combiné de tous les Xi des DEL d'une grappe, et les grappes et les DEL sont agencées de sorte que la distance entre deux DEL situées à l'intérieur d'une grappe est inférieure à la distance entre deux grappes adjacentes. En outre, la variation en Yj entre les grappes est inférieure à la variation en Xi entre les DEL du dispositif, et un paramètre « A » concerne la variation en Xi parmi la pluralité de DEL et un paramètre « B » concerne la variation en Yj parmi les grappes, et le rapport B/A est inférieur à 0,55*M(-1,5), le paramètre « M » représentant le nombre de DEL de chaque grappe. Un moniteur LCD à éclairage périphérique ou à éclairage direct comprenant le dispositif émetteur de lumière selon l'invention, ainsi qu'un procédé pour la répartition d'une pluralité de DEL dans un réseau de grappes, sont également prévus.
PCT/IB2012/052254 2011-05-18 2012-05-07 Dispositif émetteur de lumière pour moniteur/afficheur lcd à éclairage périphérique ou à éclairage direct WO2012156860A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11166545.1 2011-05-18
EP11166545 2011-05-18

Publications (1)

Publication Number Publication Date
WO2012156860A1 true WO2012156860A1 (fr) 2012-11-22

Family

ID=46197627

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/052254 WO2012156860A1 (fr) 2011-05-18 2012-05-07 Dispositif émetteur de lumière pour moniteur/afficheur lcd à éclairage périphérique ou à éclairage direct

Country Status (1)

Country Link
WO (1) WO2012156860A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015144562A1 (fr) * 2014-03-26 2015-10-01 Osram Opto Semiconductors Gmbh Procédé de classification d'élément semi-conducteur émetteur de lumière et application de capteur d'image comportant un capteur d'image et un composant semi-conducteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1811332A1 (fr) * 2004-11-09 2007-07-25 Sony Corporation Dispositif de retro-eclairage
US20070274093A1 (en) * 2006-05-25 2007-11-29 Honeywell International, Inc. LED backlight system for LCD displays
EP1925971A2 (fr) * 2006-11-21 2008-05-28 Sony Corporation Source lumineuse, dispositif de rétroéclairage, affichage à cristaux liquides, et procédé de fabrication du dispositif de rétroéclairage
WO2008110142A1 (fr) * 2007-03-09 2008-09-18 Osram Opto Semiconductors Gmbh Module led
EP2144110A1 (fr) * 2008-07-09 2010-01-13 LG Display Co., Ltd. Unité de rétroéclairage et dispositif d'affichage à cristaux liquides doté de celle-ci

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1811332A1 (fr) * 2004-11-09 2007-07-25 Sony Corporation Dispositif de retro-eclairage
US20070274093A1 (en) * 2006-05-25 2007-11-29 Honeywell International, Inc. LED backlight system for LCD displays
EP1925971A2 (fr) * 2006-11-21 2008-05-28 Sony Corporation Source lumineuse, dispositif de rétroéclairage, affichage à cristaux liquides, et procédé de fabrication du dispositif de rétroéclairage
WO2008110142A1 (fr) * 2007-03-09 2008-09-18 Osram Opto Semiconductors Gmbh Module led
EP2144110A1 (fr) * 2008-07-09 2010-01-13 LG Display Co., Ltd. Unité de rétroéclairage et dispositif d'affichage à cristaux liquides doté de celle-ci

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015144562A1 (fr) * 2014-03-26 2015-10-01 Osram Opto Semiconductors Gmbh Procédé de classification d'élément semi-conducteur émetteur de lumière et application de capteur d'image comportant un capteur d'image et un composant semi-conducteur
US11213859B2 (en) 2014-03-26 2022-01-04 Osram Oled Gmbh Method for classifying light-emitting semiconductor components and image sensor application having an image sensor and a semiconductor element

Similar Documents

Publication Publication Date Title
JP5337148B2 (ja) 固体照明パネルにおける色域の制限
JP4950995B2 (ja) 発光グループに配置された半導体光源を有するバックライト装置および発光装置
JP5324591B2 (ja) 発光体を選択するための装置および方法
US20100165001A1 (en) White light backlights and the like with efficient utilization of colored led sources
KR101881065B1 (ko) 광원 모듈 및 백라이트 유닛
US7973881B2 (en) Plane light source apparatus and liquid crystal display apparatus
JP2007183484A (ja) ディスプレイ装置
KR20100074267A (ko) 디스플레이 시스템들을 위한 ｌｅｄ 백라이트
US20170263209A1 (en) Backlight unit, display panel and display device
EP2841844B1 (fr) Améliorations à ou associées à des sources de lumière multicolores
JP2010218991A (ja) 照明装置並びにこれを用いた液晶表示装置及び映像表示装置
US10126594B2 (en) Tri-color LED groups spaced for optimal color mixing
Chertov et al. Simulation of the multicomponent radiation source with the required irradiance and color distribution on the flat illuminated surface
US8118443B2 (en) Display apparatus and light source device used in the display apparatus
US10210819B2 (en) Tunable backlight device, a display device and a method of driving the same
US9299293B2 (en) Methods and apparatus for backlighting dual modulation display devices
WO2012144337A1 (fr) Procédé pour la fabrication d'une source de lumière, et source de lumière
WO2012156860A1 (fr) Dispositif émetteur de lumière pour moniteur/afficheur lcd à éclairage périphérique ou à éclairage direct
US8876353B2 (en) Lighting apparatus
CN114596791B (zh) 显示模块制作方法
JP2012094709A (ja) 半導体発光装置及びその製造方法
JP2011254064A (ja) 面発光装置
Chen et al. Effects of color temperature and luminous efficiency for RGB LEDs mixing with tuning voltage
Wang et al. A quantitative dimming method for LED based on PWM
JP2012168286A (ja) 液晶ディスプレイパネルのバックライト制御装置、バックライト制御方法、及び液晶表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12724723

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12724723

Country of ref document: EP

Kind code of ref document: A1