JP2006260927A - Illumination device, manufacturing method of the same, and display device - Google Patents
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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 an illumination device, a control method for the illumination device, and a display device, and more particularly, an illumination device using light emitting diodes (LEDs) of three colors of R (red), G (green), and B (blue) as light sources. The present invention relates to a control method thereof and a display device using 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。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。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。 In recent years, display devices using non-self-luminous elements such as liquid crystals have rapidly spread as TV receivers and computer displays. In a display device using these non-self-light emitting elements, an illumination device using a cold cathode tube as a light source is generally used. This is because a non-self-luminous element such as a liquid crystal does not emit light itself, so that some illumination is required to visually recognize an image, and sufficient illumination cannot be obtained from the outside particularly for indoor use. It depends.
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, lighting devices using a cold cathode tube as a light source have 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 tube generally has a lifetime of only about 10,000 hours, and reaches the lifetime in a period considerably shorter than the product lifetime of the display device, and needs to be replaced.
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。 Second, cold cathode tubes contain mercury, which is a harmful substance that has become a problem in recent years, and it is necessary to collect 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 has a light emission band limited as a lighting device due to its principle, so that a high-quality display device cannot perform sufficient 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, since a cold cathode tube requires high voltage, a special power supply circuit must be installed 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。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。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。 In order to solve these problems, a lighting device using a light emitting diode (LED) has been proposed as a lighting device for non-self light emitting elements. In the early LED lighting devices for non-self light emitting elements, white LEDs in which a yellow phosphor that is a complementary color is applied to blue LEDs have been used. However, in recent years, RGB 3 is used from the viewpoint of efficiency and color reproducibility. Colored LEDs are used. In the illumination device using the RGB three-color LED, it is necessary to control the color balance which is not a problem in the cold cathode fluorescent lamp or the white LED.
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）。 For this reason, conventionally, a photodetector (for example, a photodetector using a PN junction such as silicon) is arranged corresponding to each of the RGB three-color LEDs, and the amount of monochromatic light emitted from each of the RGB LEDs by these photodetectors. And the color balance is controlled based on the detection result (see, for example, Patent Document 1).
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, since the above-described prior art employs a configuration in which photodetectors are arranged corresponding to each of the RGB three-color LEDs, the number of LEDs is the same as that of the LEDs, so that the apparatus becomes expensive. End up.
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。 Therefore, an object of the present invention is to provide an illumination device, a control method for the illumination device, and a display device that can reduce the cost of the illumination device by realizing color balance control at a low cost.
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。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。 In order to achieve the above object, according to the present invention, in an illumination device using RGB light emitting diodes as a light source, light emitted from a first light emitting diode having a predetermined band gap among the RGB light emitting diodes is received. As a light receiving element, a second light emitting diode having a band gap equal to or smaller than that of the first light emitting diode is used, and an electromotive current generated in the second light emitting diode when receiving light emitted from the first light emitting diode. And the drive control of the RGB light emitting diodes is performed based on the detection result. This illuminating device is used as an illuminating device for illuminating the non-self light emitting element in a display device using a non self light emitting element such as a liquid crystal cell.
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。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。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。 In the lighting device having the above structure or a display device using the lighting device, the light emitting diode is a light emitting element having a light emitting function, but the structure is a diode having a heterojunction structure, and the characteristics of the diode are used. It can also be used as a light receiving element. When the light emitting diode is also used as a light receiving element, it is difficult to receive the light emitted from the light emitting diode having a longer wavelength than the light emitting diode having a shorter wavelength than the light emitting diode due to the band gap. Therefore, among the RGB light emitting diodes, a second light emitting diode having a band gap equal to or smaller than that of the first light emitting diode is used as a light receiving element that receives light emitted from the first light emitting diode having a predetermined band gap. Use.
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, since the light emitting diode is also used as the light receiving element, the light amount of the light emitting diode can be detected without using a dedicated light receiving element, and the color balance can be controlled at a low cost. The cost of the lighting device can be reduced.
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。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
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。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。 FIG. 1 is a perspective view schematically showing a configuration of a display device to which the present invention is applied, for example, a liquid crystal display device. As shown in FIG. 1, the liquid crystal display device according to this application example includes a transmissive liquid crystal panel 11, a polarizing plate 12, a diffusion plate 13, and a backlight 14, and the illumination device according to the present invention is used as the backlight 14. It is the configuration used.
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。 In the liquid crystal panel 11, unit pixels including liquid crystal cells which are non-self-luminous elements are two-dimensionally arranged in a matrix on a transparent insulating substrate, for example, a first glass substrate, and each pixel is arranged in a row with respect to the matrix arrangement of the pixels. Scanning lines and signal lines are arranged for each column, and a second glass substrate is disposed opposite to the first glass substrate with a predetermined gap, and a liquid crystal material is disposed in the gap between the two substrates. Is sealed.
（画素回路）
図２は、単位画素の回路構成の一例を示す回路図である。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。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。
(Pixel circuit)
FIG. 2 is a circuit diagram illustrating an example of a circuit configuration of the unit pixel. As shown in FIG. 2, the
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。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。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。 In the pixel circuit having such a configuration, the TFT 21 has a gate electrode connected to the scanning line 31 and a source electrode connected to the signal line 32. Further, for example, the counter electrode of the liquid crystal cell 22 and the other electrode of the storage capacitor 23 are connected to the common line 33 in common for each pixel. A common voltage (counter electrode voltage) Vcom is applied to the common electrode of the liquid crystal cell 22 via the common line 33.
図１に説明を戻す。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。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。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。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。 Returning to FIG. The polarizing plate 12 is a kind of filter having a property of transmitting only light waves in a certain vibration direction. The diffuser plate 13 scatters and diffuses light emitted from the backlight 14 in order to make the entire wide surface uniform brightness. The backlight 14 is a light source of the liquid crystal panel 11 using the liquid crystal cell 22 which is a non-self light emitting element. As the backlight 14, the lighting device according to the present invention is used.
（照明装置）
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。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。
(Lighting device)
The illuminating device according to the present invention uses R (red), G (green), and B (blue) light emitting diodes (hereinafter referred to as “LED”) as a light source. For example, as shown in FIG. This group is configured by repeatedly arranging the LED as a group. In FIG. 3, only three sets of RGB LEDs are shown per row, but in reality, a large number of RGB sets are arranged.
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。 The illumination device according to the present invention is characterized in that the monochromatic light emitted by each of the RGB LEDs is detected in detecting the amount of monochromatic light emitted by each of the RGB LEDs and controlling the color balance based on the detection result. As an element for detecting the amount of light, the LED itself, which is a light emitting element, is also used.
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。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。 An LED is a light emitting element, but its structure is a diode itself having a heterojunction structure. Therefore, the lighting device according to the present invention employs a configuration in which an LED is also used as a light receiving element, instead of the silicon photodetector used in the prior art, utilizing the characteristics as a diode.
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。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。 Here, when the LED is also used as a light receiving element, it is difficult to receive light emitted from an LED having a shorter wavelength of emitted light and an LED having a longer wavelength than that due to the band gap. Specifically, among RGB LEDs, the LED of B (about 430 to 460 nm) having the shortest wavelength, and the LED of R (about 610 to 780 nm) or G (about 500 to 570 nm) having a longer wavelength. It is difficult to receive the emitted light of R, or to receive the emitted light of the R LED with the G LED.
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。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。 However, it is possible to receive light between LEDs having the same band gap, that is, LEDs that emit light of the same color. Therefore, among RGB LEDs, a second LED having a band gap equal to or less than that of the first LED is used as a light receiving element that receives light emitted from the first LED having a predetermined band gap.
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。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。 Specifically, an R LED is used as a light receiving element for receiving RGB LED light emission. However, the present invention is not limited to this combination, and a G LED can be used as a light receiving element for receiving the LED light emitted from the GB, and a B LED can be used as the light receiving element for receiving the LED light emitted from the B LED. 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。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。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。 FIG. 4 is a block diagram showing an example of the configuration of the controller (electric system) of the lighting apparatus according to the present invention. Here, in order to facilitate understanding, a case will be described as an example in which drive control is performed on a total of six LEDs, two sets of RGB. Further, an R LED is used as a light receiving element that receives RGB LED light emission.
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。
In FIG. 4, six
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。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。
The
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。
FIG. 5 is a circuit diagram showing an example of a specific circuit configuration of the
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。
In FIG. 5, the drive circuit 42-1 includes a drive transistor Tr connected in series to the
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。
The detection circuit 45-1 includes a switch SW having one end connected to the anode of the
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 is turned on (closed) only when the
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。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。
Here, when the
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。
The
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 using 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。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。
The LED cannot function as a light receiving element in a state in which the LED is driven by supplying a driving current. Therefore, among the
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。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。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。
Until this time, the detection circuits 45-1 and 45-2 are disconnected from the LEDs 41 </ b> R- 1 and 41 </ b> R- 2 by turning off the switch SW in FIG. 5. The switch SW is turned on / off under the control of the
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。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。そして、この起電流を検出回路４５−２にて検出する。
When the detection circuit 45-2 is connected to the
検出回路４５−２の検出信号は制御回路４６に入力される。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。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。これにより、ＬＥＤ４１Ｒ−１は発光を停止する。
The detection signal of the detection circuit 45-2 is input to the
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。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。
At timing t4 slightly after timing t3, the
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。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。
When the
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。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。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。
This time, the
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。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。
Thereafter, the
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 the LED is used as a photodetector, the
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。
For this reason, the
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。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。
Therefore, the
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。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。
When the light amount detection of the
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 the light amount detection of the
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 a lighting device using RGB LEDs as a light source or a display device using the lighting device as a backlight, light emitted from a first LED having a predetermined band gap among RGB LEDs is received. As a light receiving element, a second LED having a band gap equal to or smaller than that of the first LED is also used, and an electromotive current generated in the second LED is detected when light emitted from the first LED is received. By controlling the driving of RGB LEDs based on the detection results, it becomes possible to detect the light amount of the LEDs without using a dedicated light receiving element, and it is possible to realize color balance control at a low cost. The price of the device can be reduced.
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, since it is not necessary to arrange a dedicated light receiving element, the degree of freedom in the arrangement of the LEDs can be increased, the degree of freedom in the assembly method of the LEDs can be increased, and the mounting density of the LEDs can be further increased. There is also an advantage that the amount of emitted light can be increased.
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。
The series of control methods described above is an example in the present invention, and the order in which the LEDs are lit may be arbitrary, and the arrangement of the LEDs is such that the light from each LED reaches the
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。 In addition, the timing for performing a series of control can be continuously performed in a field sequential display device or the like, but in the case of other cases, for example, in the case of a television receiver or the like, After starting up the device, the RGB LEDs are driven to turn on sequentially, and after controlling the respective light emission amounts of the RGB LEDs based on the detection results of the light amounts of the LEDs, all of the RGB LEDs are It is also possible to control so that it is continuously lit.
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。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。 Alternatively, the RGB LEDs are sequentially driven to light up within a certain period, for example, the vertical blanking period of the image, and the light emission amounts of the RGB LEDs are controlled to the target light amounts based on the detection results of the light amounts of the LEDs. After that, during the next fixed period (vertical effective period), it is possible to control all the RGB LEDs to be continuously lit, that is, to control the light amounts of the RGB LEDs at a fixed period. In addition, the control may be performed at an arbitrary time as long as the amount of light is detected within a short period of time so as not to feel flickering by human eyes.
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, the amount of light is detected only with the
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。 The LEDs that are lit when detecting the amount of light do not necessarily have to be single, and the amount of light of this group of LEDs may be detected in units of a group of the same color.
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 does not necessarily have to be performed all together, and a part of the operations may be executed at regular intervals, and the intervals may be changed according to the required light amount control accuracy. 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。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。 Further, the LEDs do not necessarily have to be assembled as packages with different RGB, and may be mounted in the same package. Further, the LEDs need not have the same number of colors, and may be arbitrarily changed according to the performance of the LEDs and the requirements of the display device.
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 where the present invention is applied to a lighting device for non-self light emitting elements has been described as an example. However, the present invention is not limited to this application example, and can be used as a general lighting device. Of course.
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 DESCRIPTION OF SYMBOLS 11 ... Transmission-type liquid crystal panel, 12 ... Polarizing plate, 13 ... Diffusing plate, 14 ... Back light, 20 ... Unit pixel, 21 ... TFT (thin film transistor), 22 ... Liquid crystal cell, 23 ... Retention capacity, 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, 44-2 ... driving circuit, 45-1, 45-2 ... detection circuit, 46 ... control circuit
Claims (7)
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、
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。 An illumination device using light emitting diodes of R (red), G (green), and B (blue) as a light source,
Among the RGB light emitting diodes, when the light emitted from the first light emitting diode having a predetermined band gap is received by the second light emitting diode having a band gap equal to or less than that of the first light emitting diode, the first light emitting diode receives the first light emitting diode. Detecting means for detecting an electromotive current generated in the two light emitting diodes;
And a control unit that performs drive control of the RGB light-emitting diodes based on a detection signal of the detection unit.
ことを特徴とする請求項１記載の照明装置。 The control means sequentially drives the RGB light-emitting diodes to turn on, and the RGB based on detection signals when the detection means detects the electromotive current generated in the second light-emitting diode other than the light-emitting diodes that are lit. The lighting device according to claim 1, wherein drive control of the light emitting diode is performed.
ことを特徴とする請求項１記載の照明装置。 The lighting device according to claim 1, wherein there are a plurality of the second light emitting diodes and receive light emitted from each other.
ことを特徴とする請求項２記載の照明装置。 The control means sequentially turns on and drives the RGB light-emitting diodes immediately after the start of control, and controls the RGB light-emitting diodes to have a desired light amount based on the detection signal of the detection means. The lighting device according to claim 2, wherein all of the light emitting diodes are controlled to be continuously lit.
ことを特徴とする請求項２記載の照明装置。 The control means sequentially turns on and drives the RGB light emitting diodes in a certain period, and controls the RGB light emitting diodes to have a target light amount based on the detection signal of the detection means, and then The lighting device according to claim 2, wherein the period is controlled so that all of the RGB light emitting diodes are driven continuously.
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
ことを特徴とする照明装置の制御方法。 A control method of an illumination device using light emitting diodes of R (red), G (green), and B (blue) as a light source,
Among the RGB light emitting diodes, a second light emitting diode having a band gap equal to or less than that of the first light emitting diode is used as a light receiving element that receives light emitted from the first light emitting diode having a predetermined band gap. ,
Illumination characterized in that an electromotive current generated in the second light emitting diode is detected when light emitted from the first light emitting diode is received, and drive control of the RGB light emitting diodes is performed based on the detection result. Control method of the device.
前記照明装置は、
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、
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。 A display device that uses a non-self-light emitting element and illuminates the non-self-light emitting element with an illumination device that uses a light emitting diode of R (red), G (green), and B (blue) as a light source,
The lighting device includes:
Among the RGB light emitting diodes, when the light emitted from the first light emitting diode having a predetermined band gap is received by the second light emitting diode having a band gap equal to or less than that of the first light emitting diode, the first light emitting diode receives the first light emitting diode. Detecting means for detecting an electromotive current generated in the two light emitting diodes;
And a control unit that performs drive control of the RGB light emitting diodes based on a detection signal of the detection unit.
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