JP2006260927A - Illumination device, manufacturing method of the same, and display device - Google Patents

Illumination device, manufacturing method of the same, and display device Download PDF

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JP2006260927A
JP2006260927A JP2005076499A JP2005076499A JP2006260927A JP 2006260927 A JP2006260927 A JP 2006260927A JP 2005076499 A JP2005076499 A JP 2005076499A JP 2005076499 A JP2005076499 A JP 2005076499A JP 2006260927 A JP2006260927 A JP 2006260927A
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light
rgb
light emitting
emitting diodes
emitting diode
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Toyomi Fujino
Hisataka Izawa
Kazuyasu Onoda
Masayuki Ota
久隆 伊沢
眞之 太田
一泰 小野打
豊美 藤野
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Sony Corp
ソニー株式会社
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PROBLEM TO BE SOLVED: To solve a problem that in case of arranging light detector in correspondence with respective LEDs of three colors of R, G, B, light detectors equal to the LEDs in number are necessary, and the cost of the illumination device becomes high.
SOLUTION: On the illumination device using LEDs of RGB 41R-1, 41R-2, 41G-1, 41G-2, 41B-1, 41B-2 as light sources, LEDs of R 41R-1 and 41R-2 out of LEDs of RGB 41R-1, 41R-2, 41G-1, 41G-2, 41B-1, 41B-2 are concurrently used as light receiving elements. Inductive currents generated at LEDs of R 41R-1, 41R-2 are detected by detection circuits 45-1, 45-2, and driving of the LEDs of RGB 41R-1, 41R-2, 41G-1, 41G-2, 41B-1, 41B-2 are controlled through driving circuits 42-1, 42-2, 43-1, 43-2, 44-1, 44-2 under control of a control circuit 46, depending on a result of the above detection.
COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、照明装置、照明装置の制御方法および表示装置に関し、特にR(赤)G(緑)B(青)の3色の発光ダイオード(Light Emitting Diode;LED)を光源として用いた照明装置、その制御方法および当該照明装置をバックライトとして用いた表示装置に関する。 The present invention relates to a lighting device, relates to a control method and a display device illumination device, in particular R (red) G (green) B (blue) of three colors of light-emitting diode; lighting device using a (Light Emitting Diode LED) as the light source , a display device using the control method and the lighting device as a backlight.

近年、TV受像機やコンピュータ用ディスプレイとして、液晶などの非自発光素子を用いた表示装置が急速に普及してきている。 Recently, as a display for TV receivers and computer, a display device using a non-self-luminous element such as a liquid crystal has been used widely. これら非自発光素子を用いた表示装置では、冷陰極管を光源とする照明装置が一般的に用いられている。 In these non-self-luminous element display device using the illumination device for a cold cathode tube as a light source is generally used. これは、液晶などの非自発光素子では、素子自身が発光しないことから、映像を視認させるには何らかの照明を必要とするためであり、特に室内用途においては充分な照明を外部から得られないことによる。 This is because the non-self-luminous element such as a liquid crystal, since the element itself does not emit light, the to visually recognize the image and in order to require some lighting, not obtained sufficient illumination from the outside, especially in indoor applications According to it.

しかし、冷陰極管を光源として用いた照明装置には、以下に述べるようなさまざまな課題がある。 However, the illumination device using a cold cathode tube as a light source, there are various problems as described below.

第一に、冷陰極管は一般的に寿命が1万時間程度しかなく、表示装置の製品寿命よりかなり短い期間に寿命に達してしまい、交換の必要がある。 First, the cold cathode tubes are generally life only about 10,000 hours, will reach the life much shorter period than the product life of the display device, there is a need for replacement.

第二に、冷陰極管は近年問題になっている有害物質である水銀を含んでおり、廃棄時に水銀の回収を行う必要がある。 Secondly, the cold cathode tube contains mercury is harmful substances in recent years problems, it is necessary to perform the recovery of mercury at the time of disposal.

第三に、冷陰極管はその原理から、照明装置として発光帯域が制約されるため、高画質な表示装置では、充分な色再現ができない。 Thirdly, the cold cathode tube from the principle, since the emission band is constrained as a lighting device, high image quality display device can not sufficiently color reproduction.

第四に、冷陰極管は高圧を必要とするため、特別な電源回路を表示装置内に設置しなければならない。 Fourth, cold cathode tube requires a high pressure, must be installed a special power supply circuit in the display device.

これらの課題を解決すべく、非自発光素子用の照明装置として、発光ダイオード(LED)を用いた照明装置が提案されている。 To solve these problems, a lighting device for a non-self-luminous elements, the illumination device using a light emitting diode (LED) has been proposed. 初期の非自発光素子用のLED照明装置では、青色LEDに補色である黄色の蛍光体を塗布した白色LEDが用いられていたが、近年では、効率化・色再現性の観点からRGBの3色のLEDが用いられるようになっている。 In the initial LED lighting device for a non-self-luminous element is white LED coated with phosphor yellow is the complementary color to the blue LED has been used, in recent years, 3 from the viewpoint of efficiency and the color reproducibility of RGB so that the color of the LED is used. このRGB3色LEDを用いた照明装置では、冷陰極管や白色LEDでは問題にならなかった色バランスを制御することが必要になる。 Lighting device using the RGB3-color LED, it is necessary to control the color balance was not the cold cathode tube or the white LED problem.

このため、従来は、RGB3色のLEDの各々に対応して光検出器(例えば、シリコンなどのPN接合によるフォトディテクター)を配置し、これら光検出器でRGBの各LEDが発する単色光の光量を検出し、その検出結果を基に色バランスを制御するようにしていた(例えば、特許文献1参照)。 Therefore, conventionally, in response to each of RGB3 color LED light detector (e.g., photodetector by PN junction such as silicon) disposed, the amount of monochromatic light the LED of RGB in photodetectors emitted detects, has been to control the color balance based on the detection result (for example, see Patent Document 1).

特開2004−29141号公報 JP 2004-29141 JP

しかしながら、上記従来技術では、RGB3色のLEDの各々に対応して光検出器を配置した構成を採っていることから、LEDの数だけ光検出器が必要になるため、装置が高価になってしまう。 However, the above conventional art, since it adopts a configuration of arranging the light detector corresponding to each of RGB3 colors LED, for the number of LED is needed photodetector device becomes expensive put away.

そこで、本発明は、色バランスの制御を低コストにて実現することで、照明装置の低コスト化を可能にした照明装置、照明装置の制御方法および表示装置を提供することを目的とする。 Accordingly, the present invention controls the color balance to realize at low cost, and to provide lighting apparatus that enables cost reduction of a lighting device, a control method and a display device of a lighting device.

上記目的を達成するために、本発明では、RGBの発光ダイオードを光源として用いた照明装置において、前記RGBの発光ダイオードのうち、所定のバンドギャップを持つ第1の発光ダイオードの発光光を受光する受光素子として、当該第1の発光ダイオードと同等以下のバンドギャップを持つ第2の発光ダイオードを用い、前記第1の発光ダイオードの発光光を受光したときに前記第2の発光ダイオードに生じる起電流を検出し、その検出結果に基づいて前記RGBの発光ダイオードの駆動制御を行う構成を採っている。 To achieve the above object, the present invention, in the illumination device using the RGB light-emitting diodes as a light source, among the RGB light-emitting diodes, for receiving the light emitted from the first light emitting diode having a predetermined band gap as the light receiving element, the first light emitting diode and using the second light emitting diode having a band gap of equal to or less than, the first light emitting diode electromotive current generated in the second light emitting diodes when the light emitting light and receiving of detects, it adopts a configuration for controlling the driving of the RGB light-emitting diodes based on the detection result. この照明装置は、液晶セルなどの非自発光素子を用いた表示装置において、当該非自発光素子を照明する照明装置として用いられる。 The lighting device is a display device using the non-self-luminous element such as a liquid crystal cell, is used as an illumination device for illuminating the non-self-luminous element.

上記構成の照明装置または当該照明装置を用いた表示装置において、発光ダイオードは発光機能を持つ発光素子であるが、その構造はヘテロ接合構造を持つダイオードそのものであり、ダイオードとしての特性を利用することで受光素子として用いることもできる。 In the display device using the illumination device or the illumination device configured as described above, although the light emitting diode is a light emitting element having a light emitting function, its structure is a diode itself having a heterojunction structure, utilizing the properties of a diode in may be used as the light-receiving element. 発光ダイオードを受光素子として兼用するに当たって、発光光の波長の短い発光ダイオードで、それよりも波長の長い発光ダイオードの発光光を受光することは、バンドギャップの関係で困難である。 In also serves as a light-emitting diode as the light receiving element, a short light-emitting diode wavelength of the emitted light, it is difficult in relation to the band gap for receiving the emitted light of a long light-emitting diode wavelength than that. そこで、RGBの発光ダイオードのうち、所定のバンドギャップを持つ第1の発光ダイオードの発光光を受光する受光素子として、当該第1の発光ダイオードと同等以下のバンドギャップを持つ第2の発光ダイオードを用いる。 Therefore, among the RGB light-emitting diodes, as light receiving element for receiving light emitted from the first light emitting diode having a predetermined band gap, a second light emitting diode having a band gap of the first light emitting diode and equal to or less than used.

本発明によれば、発光ダイオードを受光素子として兼用することで、専用の受光素子を用いることなく発光ダイオードの光量検出が可能となり、色バランスの制御を低コストにて実現することができるため、照明装置の低コスト化が可能になる。 According to the present invention, be used also a light-emitting diode as a light-receiving element, it is possible to light quantity detection without emitting diodes using a dedicated light receiving element, since the control of color balance can be achieved at low cost, allowing cost reduction of a lighting device.

以下、本発明の実施の形態について図面を参照して詳細に説明する。 It will be described in detail with reference to the drawings, embodiments of the present invention.

図1は、本発明が適用される表示装置、例えば液晶表示装置の構成の概略を示す斜視図である。 Figure 1 is a display device to which the present invention is applied, for example, is a perspective view showing a schematic configuration of a liquid crystal display device. 図1に示すように、本適用例に係る液晶表示装置は、透過型液晶パネル11、偏光板12、拡散板13およびバックライト14を有し、当該バックライト14として本発明に係る照明装置を用いた構成となっている。 As shown in FIG. 1, a liquid crystal display device according to this application example, a transmissive liquid crystal panel 11, polarizing plates 12 has a diffusion plate 13 and the backlight 14, the lighting device according to the present invention as the backlight 14 It has a configuration using.

液晶パネル11は、非自発光素子である液晶セルを含む単位画素が、透明絶縁基板、例えば第1のガラス基板上に行列状に2次元配置され、この画素の行列状配置に対して行ごとに走査線が、列ごとに信号線がそれぞれ配線されるとともに、第1のガラス基板に対して所定の間隙を持って第2のガラス基板が対向配置され、両基板間の間隙内に液晶材料が封止された構成となっている。 The liquid crystal panel 11, the unit pixels including a liquid crystal cell is a non-self-luminous element, a transparent insulating substrate, for example, a matrix in two-dimensionally arranged on the first glass substrate, each row for a matrix arrangement of the pixels liquid crystal material scanline with the signal lines are provided respectively in each column, the second glass substrate with a predetermined gap with respect to the first glass substrate is disposed opposite to the gap between both substrates There has a configuration which is sealed.

(画素回路) (Pixel circuit)
図2は、単位画素の回路構成の一例を示す回路図である。 Figure 2 is a circuit diagram showing an example of a circuit configuration of a unit pixel. 図2に示すように、単位画素20は、スイッチング素子である例えばTFT(Thin Film Transistor;薄膜トランジスタ)21と、このTFT21のドレイン電極に画素電極が接続された液晶セル22と、TFT21のドレイン電極に一方の電極が接続された保持容量23とを有する構成となっている。 As shown in FIG. 2, the unit pixel 20 is a switching element for example TFT; and (Thin Film Transistor TFT) 21, a liquid crystal cell 22 having a pixel electrode connected to the drain electrode of the TFT 21, the drain electrode of the TFT 21 one electrode is configured to have a storage capacitor 23 connected. ここで、液晶セル22は、画素電極とこれに対向して形成される対向電極との間で発生する液晶容量を意味する。 Here, the liquid crystal cell 22 refers to a liquid crystal capacitance generated between the counter electrode which is formed opposite to the pixel electrode.

かかる構成の画素回路において、TFT21は、ゲート電極が走査線31に接続され、ソース電極が信号線32に接続されている。 In the pixel circuit of such a configuration, TFT 21 has a gate electrode connected to the scanning line 31, and source electrode is connected to the signal line 32. また、例えば、液晶セル22の対向電極および保持容量23の他方の電極がコモン線33に対して各画素共通に接続されている。 Further, for example, the other electrode of the counter electrode and the storage capacitor 23 of the liquid crystal cell 22 is connected to each pixel common to a common line 33. そして、液晶セル22の対向電極には、コモン線33を介してコモン電圧(対向電極電圧)Vcomが各画素共通に与えられる。 Then, the counter electrode of the liquid crystal cell 22, the common voltage (common electrode voltage) Vcom is supplied to the common pixel via the common line 33.

図1に説明を戻す。 Returning to FIG. 偏光板12は、一定の振動方向の光波だけを透過させる性質を持つ一種のフィルタである。 Polarizer 12 is a type of filter having a property of transmitting only light waves of a certain vibration direction. 拡散板13は、広い面全体を均一な明るさにするために、バックライト14から照射される光を散乱・拡散させる。 Diffusion plate 13, in order to make the entire wide surface to uniform brightness, thereby scattering and diffusing the light emitted from the backlight 14. バックライト14は、非自発光素子である液晶セル22を用いた液晶パネル11の光源である。 The backlight 14 is a light source of the liquid crystal panel 11 using a liquid crystal cell 22 is a non-self-luminous element. このバックライト14として、本発明に係る照明装置が用いられる。 As the backlight 14, lighting device is used according to the present invention.

(照明装置) (Lighting device)
本発明に係る照明装置は、R(赤)G(緑)B(青)の発光ダイオード(以下、「LED」と記す)を光源として用いており、例えば図3に示すように、RGB各1個のLEDを組としてこの組が繰り返し配置された構成となっている。 Lighting device according to the invention, R light emitting diodes (red) G (green) B (blue) (hereinafter, referred to as "LED") is used as a light source, for example, as shown in FIG. 3, RGB each 1 this set is a repeat placed constituting pieces of LED as a set. 図3では、ある1行につき3組のRGBのLEDしか示されていないが、実際には、このRGBの組が多数配置されることになる。 In Figure 3, but shown only some per line 3 sets of RGB of LED, in fact, so that the RGB set is arranged a number.

そして、本発明に係る照明装置の特徴とするところは、RGBの各LEDが発する単色光の光量を検出し、その検出結果を基に色バランスを制御するに当たり、RGBの各LEDが発する単色光の光量を検出する素子として発光素子であるLEDそのものを兼用して用いる点にある。 Then, when the feature of the illumination device according to the present invention detects the amount of monochromatic light the LED of RGB emitted, when controlling the color balance based on the detection result, the monochromatic light each LED of RGB emitted there as an element for detecting the amount of light to the point of using also serves the LED itself is a light emitting element.

LEDは発光素子であるが、その構造はヘテロ接合構造を持つダイオードそのものである。 LED is a light emitting element, but the structure is a diode itself having a heterojunction structure. そこで、本発明に係る照明装置では、ダイオードとしての特性を利用し、従来技術で用いていたシリコンのフォトディテクターの替わりに、LEDを受光素子として兼用する構成を採っている。 Therefore, in the illumination apparatus according to the present invention utilizes the characteristics as a diode, instead of the photodetector of silicon which has been used in the prior art, it adopts a configuration that also serves as a LED as the light receiving element.

ここで、LEDを受光素子として兼用するに当たって、発光光の波長の短いLEDで、それよりも波長の長いLEDの発光光を受光することは、バンドギャップの関係で困難である。 Here, when also used an LED as the light receiving element, a short LED wavelength of the emitted light, it is difficult in relation to the band gap for receiving the light emitted from the long LED wavelength than that. 具体的には、RGBのLEDのうち、波長の一番短いB(約430〜460nm)のLEDで、それよりも波長の長いR(約610〜780nm)やG(約500〜570nm)のLEDの発光光を受光することや、GのLEDでRのLEDの発光光を受光することは困難である。 Specifically, among the RGB LED, the LED of the shortest B wavelengths (approximately 430 to 460 nm), LED its longer wavelength also R (about 610~780Nm) and G (about 500 to 570 nm) and by receiving the emitted light, it is difficult to receive the light emitted from the LED of R in the LED G.

ただし、同等のバンドギャップを持つLED同士、即ち同じ色の光を発光するLED同士での受光は可能である。 However, LED together with an equivalent bandgap, i.e. light of the LED with each other to emit light of the same color are possible. そこで、RGBのLEDのうち、所定のバンドギャップを持つ第1のLEDの発光光を受光する受光素子として、当該第1のLEDと同等以下のバンドギャップを持つ第2のLEDを用いる。 Therefore, among the RGB LED, as a light receiving element for receiving light emitted from the first LED having a predetermined band gap, using a second LED having a band gap of equal to or less than the said first the LED.

具体的には、RGBのLED発光光を受光する受光素子としてRのLEDを用いる。 Specifically, using the LED of R as a light receiving element for receiving RGB LED emitting light. ただし、この組み合わせに限られるものではなく、GBのLED発光光を受光する受光素子としてGのLEDを用いることもできるし、BのLED発光光を受光する受光素子としてBのLEDを用いることもできる。 However, the invention is not limited to this combination, it is possible to use an LED of G as a light receiving element for receiving the LED light GB, also be used LED of B as a light receiving element for receiving the LED light B it can.

図4は、本発明に係る照明装置の制御計(電気系)の構成の一例を示すブロック図である。 Figure 4 is a block diagram showing an example of the configuration of the control meter of a lighting device according to the present invention (electrical system). ここでは、理解を容易にするために、RGBの組が2組、計6個のLEDを駆動制御する場合を例に挙げて説明するものとする。 Here, for ease of understanding, RGB set two sets shall be described with reference to a case of driving controlling a total of six LED as an example. また、RGBのLED発光光を受光する受光素子としてRのLEDを用いるものとする。 Further, it is assumed to use the R LED as a light receiving element for receiving RGB LED emitting light.

図4において、6個のLED41R−1,41R−2,41G−1,41G−2,41B−1,41B−2に対してこれらを駆動する駆動回路42−1,42−2,43−1,43−2,44−1,44−2が設けられている。 4, the driving circuit for driving the relative six LED41R-1,41R-2,41G-1,41G-2,41B-1,41B-2 42-1,42-2,43-1 , 43-2,44-1,44-2 is provided.

また、RのLED41R−1,41R−2に対しては、これらLED41R−1,41R−2の各々に流れる起電流を検出する検出回路45−1,45−2が設けられている。 Further, for the LED41R-1,41R-2 of R, the detection circuit 45-1 and 45-2 are provided for detecting the electromotive current flowing in each of these LED41R-1,41R-2. 制御回路46は、検出回路45−1,45−2の検出信号に応じて、LED41R−1,41R−2,41G−1,41G−2,41B−1,41B−2の各発光光量が目的の光量になるように、駆動回路42−1,42−2,43−1,43−2,44−1,44−2の制御(色バランスの制御)を行う。 Control circuit 46, in response to the detection signal of the detection circuit 45-1,45-2, LED41R-1,41R-2,41G-1,41G-2,41B-1,41B-2 of the light-emitting light amount purpose as will become light quantity, controls the drive circuit 42-1,42-2,43-1,43-2,44-1,44-2 (control of color balance).

図5は、RのLED41R−1とその駆動回路42−1および検出回路45−1の具体的な回路構成の一例を示す回路図である。 Figure 5 is a circuit diagram showing an example of a specific circuit configuration of LED41R-1 and its driving circuit 42-1 and the detection circuit 45-1 R.

図5において、駆動回路42−1は、RのLED41R−1に対して直列に接続された駆動トランジスタTrと、この駆動トランジスタTrのエミッタと電源Vddとの間に接続された抵抗R11と、駆動トランジスタTrのベースに対して直列に接続された抵抗R12とを有する構成となっており、駆動信号に応じた駆動電流をRのLED41R−1に流すことによって当該RのLED41R−1を駆動する。 5, the drive circuit 42-1 includes a driving transistor Tr connected in series to the LED41R-1 of R, the connected resistor R11 between the emitter and the power supply Vdd of the driving transistor Tr, the driving has a configuration and a resistor R12 connected in series to the base of the transistor Tr, to drive the LED41R-1 of the R by passing a drive current corresponding to the drive signal to LED41R-1 of R.

検出回路45−1は、RのLED41R−1のアノードに一端が接続されたスイッチSWと、スイッチSWの他端に一端が接続された抵抗R21と、この抵抗R21の他端に入力端が接続されたオペアンプOPと、このオペアンプOPの入出力端間に接続された抵抗R22とを有する構成となっており、RのLED41R−1が非駆動時において受光素子として機能するときに当該LED41R−1に流れる起電流を検出し、当該起電流に応じたレベルの検出信号を出力する。 Detection circuit 45-1, a switch SW which one end to the anode of LED41R-1 of R is connected, a resistor R21 having one end connected to the other end of the switch SW, the input terminal connected to the other end of the resistor R21 and an operational amplifier OP, which is has a configuration and a resistor R22 connected between the input and output terminals of the operational amplifier OP, the LED41R-1 when LED41R-1 in R functions as a light receiving element at the time of non-driving detecting an electromotive current flowing through, and outputs a level detection signal corresponding to the electromotive current.

この検出回路45−1において、スイッチSWは、RのLED41R−1が受光素子として機能するときだけオン(閉)状態となり、駆動電流が検出回路45−1内に流れ込むのを阻止する一方、RのLED41R−1が受光素子として機能するときに当該LED41R−1に流れる起電流を検出する。 In this detection circuit 45-1, the switch SW, while LED41R-1 of R is only turned on (closed) when functioning as a light receiving element, a driving current is prevented from flowing into the detection circuit 45-1, R of LED41R-1 detects the electromotive current flowing through the LED41R-1 when functioning as a light receiving element.

ここで、RのLED41R−1が受光素子として機能するときに当該LED41R−1には、受光したLEDの光量に応じた起電流が流れることになる。 Here, the relevant LED41R-1 when LED41R-1 in R functions as a light receiving element, so that the electromotive current corresponding to the quantity of the received LED flows. したがって、検出回路45−1は、RのLED41R−1が受光したLEDの光量に応じたレベルの検出信号を出力することになる。 Therefore, the detection circuit 45-1 would LED41R-1 of R outputs a level detection signal corresponding to the light amount of the LED that is received.

RのLED41R−2とその駆動回路42−2および検出回路45−2についても、RのLED41R−1とその駆動回路42−1および検出回路45−1と同じ回路構成となっている。 For R of LED41R-2 and its driving circuit 42-2 and the detection circuit 45-2 also has the same circuit configuration of the R LED41R-1 and its driving circuit 42-1 and the detection circuit 45-1.

次に、図4に示す制御系の回路動作について、図6のタイミングチャートを用いて説明する。 Next, the circuit operation of the control system shown in FIG. 4 will be described with reference to the timing chart of FIG.

駆動電流を流してLEDを駆動している状態では当該LEDは受光素子として機能することができない。 The LED can not function as the light receiving element is in a state of flowing the drive current driving the LED. このため、LED41R−1,41R−2,41G−1,41G−2,41B−1,41B−2のうち、RのLED41R−1を駆動している駆動回路42−1の状態を保持したまま、その他の駆動回路43−1,44−1,42−2,43−2,44−2に対して駆動電流の供給を停止するように制御回路46から制御信号をタイミングt1で送出する。 Therefore, among the LED41R-1,41R-2,41G-1,41G-2,41B-1,41B-2, while maintaining the state of the driving circuit 42-1 which drives the LED41R-1 of R sends a control signal at a timing t1 from the control circuit 46 to stop the supply of the drive current to the other drive circuit 43-1,44-1,42-2,43-2,44-2.

このときまでは、検出回路45−1,45−2は、図5のスイッチSWをオフ(開)状態にすることで、LED41R−1,41R−2とは切り離されているようにする。 By this time, the detection circuit 45-1 and 45-2, by which the switch SW to OFF (open) state in FIG. 5, so that separate from the LED41R-1,41R-2. スイッチSWのオン/オフの切替えは、例えば制御回路46の制御の下に行われる。 Switching of the switch SW on / off is performed under the control of for example the control circuit 46. 図6のタイミングチャートにおいて、斜線の部分は検出回路45−1,45−2がLED41R−1,41R−2と切り離されていることを示している。 In the timing chart of FIG. 6, the hatched portion indicates that the detection circuit 45-1 and 45-2 are disconnected from the LED41R-1,41R-2.

タイミングt1から若干の時間をおいてタイミングt2で検出回路45−2がLED41R−2に接続されると、LED41R−2は受光素子として機能し、近傍のLED41R−1の発光光を受光する。 When the detection circuit 45-2 at the timing t2 at some time from the timing t1 is connected to LED41R-2, LED41R-2 functions as a light receiving element, for receiving the light emitted LED41R-1 in the vicinity. これにより、LED41R−2にはLED41R−1の光量に応じた起電流が生じる。 Accordingly, electromotive current is generated in accordance with the amount of LED41R-1 in LED41R-2. そして、この起電流を検出回路45−2にて検出する。 Then, to detect the electromotive current by the detection circuit 45-2.

検出回路45−2の検出信号は制御回路46に入力される。 Detection signals of the detection circuits 45-2 is input to the control circuit 46. これにより、制御回路46は、検出回路45−2からの検出信号に応じて、LED41R−1の光量を制御すべき量を設定できる。 Thus, the control circuit 46, in response to the detection signal from the detection circuit 45-2 can be set the amount to control the amount of LED41R-1. 制御回路46は、検出回路45−2からの出力信号(検出信号)を取り込んだ後に、タイミングt3にてLED41R−1の駆動回路42−1に駆動停止の制御信号を出力する。 The control circuit 46, after incorporating the output signal from the detection circuit 45-2 (detection signal), and outputs a control signal for driving stops at timing t3 to a drive circuit 42-1 LED41R-1. これにより、LED41R−1は発光を停止する。 Thus, LED41R-1 stops emitting light.

タイミングt3の若干後のタイミングt4に、制御回路46は駆動回路43−1にLED41G−1を駆動するように制御信号を出力し、LED41G−1を発光させる。 Slightly timing t4 after the timing t3, the control circuit 46 outputs a control signal to drive the LED41G-1 to the drive circuit 43-1, emit LED41G-1. このときのLED41G−1の発光量はt1以前の駆動電流と等しくなるように設定するのが望ましい。 Emission amount of LED41G-1 at this time is desirably set to be equal to the t1 previous drive current.

タイミングt4でLED41G−1が発光すると、LED41R−2に達したLED41G−1からの光によって、LED41R−2にはその光量に応じて起電流が生じる。 When LED41G-1 emits light at the timing t4, the light from LED41G-1 reaching LED41R-2, the LED41R-2 electromotive current is generated in accordance with the amount of light. この起電流を検出回路45−2にて、前述のLED41R−1のときと同様に検出し、その検出信号を制御回路46に出力する。 The electromotive stream at detection circuit 45-2 detects as in the case of LED41R-1 described above, and outputs the detection signal to the control circuit 46.

制御回路46は、今度はLED41G−1の光量として検出回路45−2の検出信号を解釈することができる。 Control circuit 46, in turn able to interpret the detection signal of the detection circuit 45-2 as the light amount of LED41G-1. 以下同様に、制御回路46は、駆動回路43−1をタイミングt5で停止し、タイミングt6にて駆動回路44−1に対してLED41B−1を駆動するように制御を行う。 Similarly, the control circuit 46, the driving circuit 43-1 stops at timing t5, performs control to drive the LED 41b-1 to the drive circuit 44-1 at the timing t6. その後にLED41B−1の光量を検出回路45−2にて検出し、同様にLED41B−1の光量に応じた検出信号を制御回路46に入力する。 Thereafter detected by the detecting circuit 45-2 the light intensity of the LED 41b-1, and inputs a detection signal corresponding to the same light quantity of LED 41b-1 to the control circuit 46.

その後に、制御回路46は、タイミングt7にてLED41B−1の発光を停止するように駆動回路44−1に制御信号を出力する。 Thereafter, the control circuit 46 outputs a control signal to the driving circuit 44-1 to stop the light emission of the LED 41b-1 at the timing t7. ここまでで、LED41R−1,41G−1,41B−1の光量の検出は可能だが、LED41R−2の光量の検出は行えていないことになる。 By now, LED41R-1,41G-1,41B-1 of the detection of the quantity of light but can, thus not perform the detection of the light amount of LED41R-2.

LEDをフォトディテクターとして使用する場合には、RのLED41R−1,41R−2で、Rよりも波長の短いGのLED41G−1,41G−2や、Bの41B−1,41B−2の受光は可能だが、LED41R−1、41R−2の発光量を、Rよりも短波長の光を発光するLEDであるLED41G−1,41B−1などで受光することは、バンドギャップの関係で困難である。 When using an LED as a photodetector is a LED41R-1,41R-2 of R, and LED41G-1,41G-2 of short wavelengths G than R, 41B-1 and 41b-2 of the reception of the B Although it can, the amount of light emitted LED41R-1,41R-2, to be received by such LED41G-1,41B-1 is an LED which emits light having a shorter wavelength than R is difficult in relation to the bandgap is there.

そのため、フォトディテクターとしてLED41G−1,41B−1などは適切ではなく、しかも、LED41R−1の発光量を検出するためには、同等以下のバンドギャップを持っているLEDで検出を行う必要がある。 Therefore, such LED41G-1,41B-1 as photodetector is not appropriate, moreover, in order to detect the amount of light emitted LED41R-1, it is necessary to detect an LED that has a band gap equal or less .

そこで、タイミングt8にてLED41R−2を発光させ、このLED41R−2の発光光を、当該LED41R−2と同じバンドギャップを持つLED41R−1で受光し、当該LED41R−1の起電流を検出回路45−1にて検出する。 Therefore, light is emitted LED41R-2 at a timing t8, the emission light of the LED41R-2, received by LED41R-1 having the same band gap with the LED41R-2, the LED41R-1 electromotive current detecting circuit 45 It is detected by -1. そして、制御回路46では、検出回路45−1の検出信号をLED41R−2の光量として入力をするように回路を切り替える。 Then, the control circuit 46 switches the circuit so as to input the detection signal of the detection circuit 45-1 as the light amount of LED41R-2.

LED41R−2の光量検出が完了したならば、制御回路46は、タイミングt9でLED41R−1を検出回路45−1から切り離す。 If the light quantity detection LED41R-2 is completed, the control circuit 46 disconnects the LED41R-1 from the detection circuit 45-1 at the timing t9. そして、タイミングt10にて、上記検出結果に基づいて、必要な駆動信号を駆動回路42−1,42−2,43−1,43−2,44−1、44−2に与える。 Then, at the timing t10, based on the detection result, it provides the necessary drive signals to the drive circuit 42-1,42-2,43-1,43-2,44-1,44-2.

ここでは、LED41G−2、41B−2の光量検出に関しては述べなかったが、LED41B−1の後に、これらの光量検出を上記と同様に行っても良いし、全く別のタイミングで行っても良い。 Although not described with respect to the light quantity detecting LED41G-2,41B-2, after the LED 41b-1, to these light quantity detection may be performed in the same manner as described above, may be carried out entirely at another timing .

上述したように、RGBのLEDを光源として用いた照明装置または当該照明装置をバックライトとして用いた表示装置において、RGBのLEDのうち、所定のバンドギャップを持つ第1のLEDの発光光を受光する受光素子として、当該第1のLEDと同等以下のバンドギャップを持つ第2のLEDを兼用し、第1のLEDの発光光を受光したときに第2のLEDに生じる起電流を検出してその検出結果に基づいてRGBのLEDの駆動制御を行うことで、専用の受光素子を用いることなくLEDの光量検出が可能となり、色バランスの制御を低コストにて実現することができるため、照明装置の価格を抑えることができる。 As described above, in the display device using the illumination device or the illumination device using the RGB LED as the light source as a backlight, of the RGB LED, receiving the light emitted from the first LED having a predetermined band gap as a light receiving element, the first second LED also serves as a with the LED and following the band gap equivalent, by detecting the electromotive current generated in the second LED when receiving the light emitted from the first LED by performing drive control of RGB LED based on the detection result, LED light amount detection becomes possible without using a dedicated light receiving element, since the control of color balance can be achieved at a low cost, lighting it is possible to suppress the price of the device.

また、専用の受光素子を配置しなくて済むことにより、LEDの配置に自由度ができるとともに、LEDの組立方法に自由度ができ、さらにはLEDの実装密度をより高めることができ、照明装置の発光量を増加できる利点もある。 In addition, by eliminating the need to place a dedicated light receiving element, it is freedom of arrangement of the LED, the assembly method of the LED can freedom of, can further increase the mounting density of the LED, the lighting device there is also the advantage of increasing the amount of light emission.

上述した一連の制御方法は、本発明においての一例であり、LEDの点灯する順番は任意で構わないし、LEDの配置も各LEDの光が、LED41R−1,41R−2に達するような配置であれば良い。 Series of control method described above is an example of the present invention, to lighting to the order of the LED may be arbitrary, the arrangement of the LED is also of the LED light, in an arrangement such as to reach the LED41R-1,41R-2 it is sufficient.

また、一連の制御を行うタイミングは、フィールドシーケンシャル方式の表示装置などでは、連続して行うことが可能であるが、そうでない場合、例えばテレビ受像機などの場合は、制御の開始直後、具体的には装置の起動時にRGBのLEDを順次点灯駆動し、各LEDの光量の検出結果に基づいてRGBのLEDの各発光光量を目的の光量になるように制御した後、RGBのLEDの全てが連続点灯するように制御することも可能である。 The timing of performing a series of control, in a display device of field sequential system, if it is possible to continuously perform, not, for example, in the case of a television receiver, immediately after the start of the control, specifically the RGB LED are sequentially turned on and driven at startup of the device to, after controlled to light quantity of interest each amount of light emitted from the RGB LED, all RGB LED is based on the detection result of the light intensity of each LED it is also possible to control such continuous lighting.

あるいは、一定の期間、例えば画像の垂直帰線期間内でRGBのLEDを順次点灯駆動し、各LEDの光量の検出結果に基づいてRGBのLEDの各発光光量を目的の光量になるように制御した後、次の一定の期間(垂直有効期間)はRGBのLEDの全てを連続点灯駆動するように制御する、即ち一定周期でRGBのLEDの各光量制御を行うことも可能である。 Alternatively, a period of time, for example, sequential lighting drives the RGB LED in the vertical blanking period of the image, control such that the amount of interest each amount of light emitted from the RGB LED based on a detection result of the light quantity of each LED after a period of time (vertical effective period) the following control so as to continue lighting drive all RGB LED, i.e. it is also possible to perform the light control of RGB LED at a constant period. また、人間の目にちらつきとして感じない程度に短時間の間に光量の検出を行うようにすれば、任意の時間に制御を行っても良い。 Further, if to perform the detection of the light intensity in a short time so as not to feel as flicker by human eyes may be controlled at any time.

上記実施形態では、LED41R−1,41R−2のみで光量の検出を行ったが、LEDの配置上、LED41G−1,41B−1などの光が検出しにくい場合は、LED41G−1,41G−2,41B−1,41B−2などで検出を行うようにして、検出回路を増設しても良いし、適時必要な検出回路を使用することも可能である。 In the above embodiment has been LED41R-1,41R-2 only detected amount of light, the on arrangement of LED, if difficult to detect light such as LED41G-1,41B-1 are, LED41G-1,41G- 2,41B-1,41B-2 so as to detect the like, may be added to the detection circuit, it is also possible to use a timely required detection circuit.

この光量の検出時に点灯しているLEDは、必ずしも単一である必要はなく、同一色のひとまとまりを単位として、このひとまとまりのLEDの光量を検出するようにしても構わない。 Lit LED upon detection of the light quantity is not necessarily a single, as a unit of the same color batches and may be configured to detect the light intensity of the LED of this human unity.

さらに、一連の動作は、必ずしも、すべてをまとめて行う必要はなく、一部分を一定間隔をおいて実行しても構わなく、その間隔も必要な光量の制御の精度に応じて変化させるようにして構わない。 Furthermore, the series of operations, not necessarily need to be performed together all rather may be executed at predetermined intervals a portion, so as to vary depending on the accuracy of control of the interval is also required quantity I do not care.

また、LEDは、必ずしもRGBが違うパッケージとして組み立てられている必要はなく、同一のパッケージに実装されていても良い。 Moreover, LED is not necessarily required to be assembled as a package RGB are different, may be mounted in the same package. さらに、LEDは、各色を同一の数にする必要はなく、LEDの性能や表示装置の要求に応じて任意に変更しても良い。 Moreover, LED has a respective colors need not be the same number may be arbitrarily changed in accordance with a request of the LED performance and display.

なお、上記実施形態では、非自発光素子用の照明装置に適用した場合を例に挙げて説明したが、この適用例に限られるものではなく、一般的な照明装置として用いることが可能であることは勿論である。 In the above embodiment, the case of applying to the lighting device for a non-self-luminous element has been described as an example, not limited to this application example, it is possible to use as a general illumination device it is a matter of course.

本発明が適用される液晶表示装置の構成の概略を示す斜視図である。 It is a perspective view showing a schematic configuration of a liquid crystal display device to which the present invention is applied. 単位画素の回路構成の一例を示す回路図である。 Is a circuit diagram showing an example of a circuit configuration of a unit pixel. RGBのLEDの配置例を示す側面図である。 Is a side view showing an example of arrangement of RGB the LED. 本発明に係る照明装置の制御系の構成の一例を示すブロック図である。 An example of a configuration of a control system of a lighting device according to the present invention is a block diagram showing. RのLEDとその駆動回路および検出回路の具体的な回路構成の一例を示す回路図である。 Is a circuit diagram showing an example of a specific circuit configuration of the LED and a driving circuit and a detection circuit R. 図4の制御系の回路動作の説明に供するタイミングチャートである。 Is a timing chart for explaining circuit operation of the control system of FIG.

符号の説明 DESCRIPTION OF SYMBOLS

11…透過型液晶パネル、12…偏光板、13…拡散板、14…バックライト、20…単位画素、21…TFT(薄膜トランジスタ)、22…液晶セル、23…保持容量、31…走査線、32…信号線、41R−1,41R−2,41G−1,41G−2,41B−1,41B−2…LED(発光ダイオード)、42−1,42−2,43−1,43−2,44−1,44−2…駆動回路、45−1,45−2…検出回路、46…制御回路 11 ... transmission type liquid crystal panel, 12 ... polarization plate 13 ... diffuser plate, 14 ... backlight, 20 ... unit pixel, 21 ... TFT (thin film transistor), 22 ... liquid crystal cell, 23 ... storage capacitor, 31 ... scanning line, 32 ... signal line, 41R-1,41R-2,41G-1,41G-2,41B-1,41B-2 ... LED (light emitting diode), 42-1,42-2,43-1,43-2, 44-1 and 44-2 ... driving circuit, 45-1, 45-2 ... detecting circuit, 46 ... control circuit

Claims (7)

  1. R(赤)G(緑)B(青)の発光ダイオードを光源として用いた照明装置であって、 The light emitting diodes of R (red) G (green) B (blue) A lighting apparatus using as a light source,
    前記RGBの発光ダイオードのうち、所定のバンドギャップを持つ第1の発光ダイオードの発光光を、当該第1の発光ダイオードと同等以下のバンドギャップを持つ第2の発光ダイオードで受光したときに当該第2の発光ダイオードに生じる起電流を検出する検出手段と、 Among the RGB light-emitting diodes, said first emitted light of the first light emitting diode having a predetermined band gap, when received by the second light emitting diode having a band gap of the first light emitting diode and equal to or less than detection means for detecting an electromotive current generated in the second light-emitting diodes,
    前記検出手段の検出信号に基づいて前記RGBの発光ダイオードの駆動制御を行う制御手段と を具備することを特徴とする照明装置。 Lighting apparatus characterized by comprising a control means for controlling the driving of the light emitting diode of the RGB based on a detection signal of said detecting means.
  2. 前記制御手段は、前記RGBの発光ダイオードを順次点灯駆動し、点灯している発光ダイオード以外の前記第2の発光ダイオードに生じる起電流を前記検出手段で検出したときの検出信号に基づいて前記RGBの発光ダイオードの駆動制御を行う ことを特徴とする請求項1記載の照明装置。 Wherein, the RGB sequential lighting drives the light emitting diode, lights up on the basis of the electromotive current generated in the second light-emitting diodes other than by being light-emitting diodes in the detection signal when detected by the detecting means RGB lighting apparatus according to claim 1, characterized in that the drive control of the light emitting diode.
  3. 前記第2の発光ダイオードは複数存在し、相互に相手の発光する光を受光する ことを特徴とする請求項1記載の照明装置。 It said second light emitting diodes there are a plurality of illumination apparatus according to claim 1, wherein the receiving light emitted mutually opponent.
  4. 前記制御手段は、制御の開始直後に前記RGBの発光ダイオードを順次点灯駆動し、前記検出手段の検出信号に基づいて前記RGBの発光ダイオードを目的の光量になるように制御した後、前記RGBの発光ダイオードの全てを連続点灯駆動するように制御する ことを特徴とする請求項2記載の照明装置。 Said control means, said RGB light emitting diodes are sequentially lighting driving immediately after the start of the control, after controlled to light quantity of interest the RGB light-emitting diodes based on the detection signal of said detecting means, said RGB lighting apparatus according to claim 2, wherein the controller controls so as to continue lighting drive all of the light emitting diodes.
  5. 前記制御手段は、一定の期間で前記RGBの発光ダイオードを順次点灯駆動し、前記検出手段の検出信号に基づいて前記RGBの発光ダイオードを目的の光量になるように制御した後、次の一定の期間は前記RGBの発光ダイオードの全てを連続点灯駆動するように制御する ことを特徴とする請求項2記載の照明装置。 Said control means, said RGB light emitting diodes are sequentially lit driven at a constant period, after controlled to light quantity of interest the RGB light-emitting diodes based on the detection signal of said detecting means, the following constant period lighting device according to claim 2, wherein the controller controls so as to continue lighting drive all the RGB light emitting diodes.
  6. R(赤)G(緑)B(青)の発光ダイオードを光源として用いた照明装置の制御方法であって、 The light emitting diodes of R (red) G (green) B (blue) A method for controlling a lighting device used as a light source,
    前記RGBの発光ダイオードのうち、所定のバンドギャップを持つ第1の発光ダイオードの発光光を受光する受光素子として、当該第1の発光ダイオードと同等以下のバンドギャップを持つ第2の発光ダイオードを用い、 Among the RGB light-emitting diodes, as light receiving element for receiving light emitted from the first light emitting diode having a predetermined band gap, with a second light emitting diode having a band gap of the first light emitting diode and equal to or less than ,
    前記第1の発光ダイオードの発光光を受光したときに前記第2の発光ダイオードに生じる起電流を検出し、その検出結果に基づいて前記RGBの発光ダイオードの駆動制御を行う ことを特徴とする照明装置の制御方法。 Illumination, wherein said second detecting an electromotive current generated in the light emitting diode, to perform the drive control of the RGB light-emitting diodes based on the detection result when receiving the emitted light of the first light emitting diode method of controlling the apparatus.
  7. 非自発光素子を用い、当該非自発光素子をR(赤)G(緑)B(青)の発光ダイオードを光源として用いた照明装置で照明する表示装置であって、 Using non-self-luminous element, a display device for illuminating an illumination device using the non-self-luminous element emitting diodes of R (red) G (green) B (blue) as a light source,
    前記照明装置は、 The lighting device,
    前記RGBの発光ダイオードのうち、所定のバンドギャップを持つ第1の発光ダイオードの発光光を、当該第1の発光ダイオードと同等以下のバンドギャップを持つ第2の発光ダイオードで受光したときに当該第2の発光ダイオードに生じる起電流を検出する検出手段と、 Among the RGB light-emitting diodes, said first emitted light of the first light emitting diode having a predetermined band gap, when received by the second light emitting diode having a band gap of the first light emitting diode and equal to or less than detection means for detecting an electromotive current generated in the second light-emitting diodes,
    前記検出手段の検出信号に基づいて前記RGBの発光ダイオードの駆動制御を行う制御手段とを具備する ことを特徴とする表示装置。 Display device characterized by comprising a control means for controlling the driving of the light emitting diode of the RGB based on a detection signal of said detecting means.
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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008102707A1 (en) * 2007-02-23 2008-08-28 Sony Corporation Light source device and liquid crystal display device
JP2008282936A (en) * 2007-05-10 2008-11-20 Texas Instr Japan Ltd Backlight device
WO2008152922A1 (en) * 2007-06-15 2008-12-18 Sharp Kabushiki Kaisha Solid state illumination system
JP2009059980A (en) * 2007-09-03 2009-03-19 Citizen Electronics Co Ltd Led light emitting device
JP2009177520A (en) * 2008-01-24 2009-08-06 Nittoh Kogaku Kk Line scanner device
JP2009274657A (en) * 2008-05-16 2009-11-26 Toshiba Lighting & Technology Corp Illuminating device
JP2010073932A (en) * 2008-09-19 2010-04-02 Totoku Electric Co Ltd Electronic instrument
JP2010525567A (en) * 2007-04-20 2010-07-22 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 Lighting device with led for detecting
JP2010250979A (en) * 2009-04-10 2010-11-04 Nittoh Kogaku Kk Illumination device, illumination system, and illumination control method
JP2011003297A (en) * 2009-06-16 2011-01-06 Nittoh Kogaku Kk Lighting system and lighting control method
WO2012036133A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Display unit and display device
WO2012036124A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Led unit and led display
WO2012036125A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Led unit drive method
JP2012533164A (en) * 2009-07-12 2012-12-20 ケトラ・インコーポレーテッド Intelligent lighting device
JP2013501258A (en) * 2009-08-05 2013-01-10 ケトラ・インコーポレーテッド Display systems, lighting devices, optical communication systems and methods related thereto
US9155155B1 (en) 2013-08-20 2015-10-06 Ketra, Inc. Overlapping measurement sequences for interference-resistant compensation in light emitting diode devices
US9237623B1 (en) 2015-01-26 2016-01-12 Ketra, Inc. Illumination device and method for determining a maximum lumens that can be safely produced by the illumination device to achieve a target chromaticity
US9237620B1 (en) 2013-08-20 2016-01-12 Ketra, Inc. Illumination device and temperature compensation method
US9237612B1 (en) 2015-01-26 2016-01-12 Ketra, Inc. Illumination device and method for determining a target lumens that can be safely produced by an illumination device at a present temperature
US9247605B1 (en) 2013-08-20 2016-01-26 Ketra, Inc. Interference-resistant compensation for illumination devices
US9276766B2 (en) 2008-09-05 2016-03-01 Ketra, Inc. Display calibration systems and related methods
US9295112B2 (en) 2008-09-05 2016-03-22 Ketra, Inc. Illumination devices and related systems and methods
US9332598B1 (en) 2013-08-20 2016-05-03 Ketra, Inc. Interference-resistant compensation for illumination devices having multiple emitter modules
US9345097B1 (en) 2013-08-20 2016-05-17 Ketra, Inc. Interference-resistant compensation for illumination devices using multiple series of measurement intervals
US9360174B2 (en) 2013-12-05 2016-06-07 Ketra, Inc. Linear LED illumination device with improved color mixing
US9386668B2 (en) 2010-09-30 2016-07-05 Ketra, Inc. Lighting control system
US9392660B2 (en) 2014-08-28 2016-07-12 Ketra, Inc. LED illumination device and calibration method for accurately characterizing the emission LEDs and photodetector(s) included within the LED illumination device
US9392663B2 (en) 2014-06-25 2016-07-12 Ketra, Inc. Illumination device and method for controlling an illumination device over changes in drive current and temperature
US9485813B1 (en) 2015-01-26 2016-11-01 Ketra, Inc. Illumination device and method for avoiding an over-power or over-current condition in a power converter
US9510416B2 (en) 2014-08-28 2016-11-29 Ketra, Inc. LED illumination device and method for accurately controlling the intensity and color point of the illumination device over time
US9557214B2 (en) 2014-06-25 2017-01-31 Ketra, Inc. Illumination device and method for calibrating an illumination device over changes in temperature, drive current, and time
US9578724B1 (en) 2013-08-20 2017-02-21 Ketra, Inc. Illumination device and method for avoiding flicker
US9651632B1 (en) 2013-08-20 2017-05-16 Ketra, Inc. Illumination device and temperature calibration method
US9736895B1 (en) 2013-10-03 2017-08-15 Ketra, Inc. Color mixing optics for LED illumination device
US9736903B2 (en) 2014-06-25 2017-08-15 Ketra, Inc. Illumination device and method for calibrating and controlling an illumination device comprising a phosphor converted LED
US9769899B2 (en) 2014-06-25 2017-09-19 Ketra, Inc. Illumination device and age compensation method
US10161786B2 (en) 2014-06-25 2018-12-25 Lutron Ketra, Llc Emitter module for an LED illumination device
US10210750B2 (en) 2011-09-13 2019-02-19 Lutron Electronics Co., Inc. System and method of extending the communication range in a visible light communication system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001119063A (en) * 1999-10-20 2001-04-27 Nitto Kogaku Kk Light emitting/receiving circuit and camera and optical device
JP2001197253A (en) * 2000-01-14 2001-07-19 Nitto Kogaku Kk Information output device, line sensor device and information reading method
WO2003075617A1 (en) * 2002-03-01 2003-09-12 Sharp Kabushiki Kaisha Light emitting device and display unit using the light emitting device and reading device
JP2004325643A (en) * 2003-04-23 2004-11-18 Seiko Epson Corp Projector and optical apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001119063A (en) * 1999-10-20 2001-04-27 Nitto Kogaku Kk Light emitting/receiving circuit and camera and optical device
JP2001197253A (en) * 2000-01-14 2001-07-19 Nitto Kogaku Kk Information output device, line sensor device and information reading method
WO2003075617A1 (en) * 2002-03-01 2003-09-12 Sharp Kabushiki Kaisha Light emitting device and display unit using the light emitting device and reading device
JP2004325643A (en) * 2003-04-23 2004-11-18 Seiko Epson Corp Projector and optical apparatus

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008210878A (en) * 2007-02-23 2008-09-11 Sony Corp Light source device and liquid crystal display device
WO2008102707A1 (en) * 2007-02-23 2008-08-28 Sony Corporation Light source device and liquid crystal display device
JP2010525567A (en) * 2007-04-20 2010-07-22 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 Lighting device with led for detecting
JP2008282936A (en) * 2007-05-10 2008-11-20 Texas Instr Japan Ltd Backlight device
JP4514770B2 (en) * 2007-05-10 2010-07-28 日本テキサス・インスツルメンツ株式会社 Backlight device
WO2008152922A1 (en) * 2007-06-15 2008-12-18 Sharp Kabushiki Kaisha Solid state illumination system
GB2458095A (en) * 2007-06-15 2009-09-09 Sharp Kk Solid state illumination system with elements employed as both light source and light sensor
US9326348B2 (en) 2007-06-15 2016-04-26 Sharp Kabushiki Kaisha Solid state illumination system
JP2009059980A (en) * 2007-09-03 2009-03-19 Citizen Electronics Co Ltd Led light emitting device
JP2009177520A (en) * 2008-01-24 2009-08-06 Nittoh Kogaku Kk Line scanner device
JP2009274657A (en) * 2008-05-16 2009-11-26 Toshiba Lighting & Technology Corp Illuminating device
US9295112B2 (en) 2008-09-05 2016-03-22 Ketra, Inc. Illumination devices and related systems and methods
US9276766B2 (en) 2008-09-05 2016-03-01 Ketra, Inc. Display calibration systems and related methods
US9509525B2 (en) 2008-09-05 2016-11-29 Ketra, Inc. Intelligent illumination device
JP2010073932A (en) * 2008-09-19 2010-04-02 Totoku Electric Co Ltd Electronic instrument
JP2010250979A (en) * 2009-04-10 2010-11-04 Nittoh Kogaku Kk Illumination device, illumination system, and illumination control method
JP2011003297A (en) * 2009-06-16 2011-01-06 Nittoh Kogaku Kk Lighting system and lighting control method
JP2012533164A (en) * 2009-07-12 2012-12-20 ケトラ・インコーポレーテッド Intelligent lighting device
JP2013501258A (en) * 2009-08-05 2013-01-10 ケトラ・インコーポレーテッド Display systems, lighting devices, optical communication systems and methods related thereto
WO2012036133A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Display unit and display device
WO2012036124A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Led unit and led display
WO2012036125A1 (en) * 2010-09-17 2012-03-22 シャープ株式会社 Led unit drive method
US9386668B2 (en) 2010-09-30 2016-07-05 Ketra, Inc. Lighting control system
US10210750B2 (en) 2011-09-13 2019-02-19 Lutron Electronics Co., Inc. System and method of extending the communication range in a visible light communication system
US9651632B1 (en) 2013-08-20 2017-05-16 Ketra, Inc. Illumination device and temperature calibration method
US9155155B1 (en) 2013-08-20 2015-10-06 Ketra, Inc. Overlapping measurement sequences for interference-resistant compensation in light emitting diode devices
US9332598B1 (en) 2013-08-20 2016-05-03 Ketra, Inc. Interference-resistant compensation for illumination devices having multiple emitter modules
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US9237620B1 (en) 2013-08-20 2016-01-12 Ketra, Inc. Illumination device and temperature compensation method
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