JP2007012405A - Lighting system - Google Patents

Lighting system Download PDF

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JP2007012405A
JP2007012405A JP2005191079A JP2005191079A JP2007012405A JP 2007012405 A JP2007012405 A JP 2007012405A JP 2005191079 A JP2005191079 A JP 2005191079A JP 2005191079 A JP2005191079 A JP 2005191079A JP 2007012405 A JP2007012405 A JP 2007012405A
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light
light emitting
emitting diodes
emitting diode
leds
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JP4570521B2 (en
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Yuichi Iwama
祐一 岩間
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Rhythm Watch Co Ltd
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Rhythm Watch Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system capable of preventing generation of color unevenness. <P>SOLUTION: An LED driving circuit 122 lights odd numbered LEDs and even numbered LEDs alternatively or one by one in order so that overlap of lights is eliminated when two LEDs of different colors are adjacently and closely arranged when performing emission drive of a plurality of LEDs 121-1 to 121-n. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、たとえば車両に搭載される計器等を照明する照明装置に係り、特に、複数の発光ダイオードが並列に近接配置された照明装置に関するものである。   The present invention relates to an illumination device that illuminates, for example, a meter mounted on a vehicle, and more particularly to an illumination device in which a plurality of light emitting diodes are arranged close to each other in parallel.

車両計器用照明装置として、たとえば特許文献１に記載されてものが知られている。
特許文献１に記載された照明装置は、計器を照明する複数の発光ダイオードと第１電流制限抵抗とが直列接続された複数の第１発光ダイオード駆動回路と、これら第１発光ダイオード駆動回路と並列接続され、第１発光ダイオード駆動回路より少ない個数の発光ダイオードと第２電流制限抵抗とが直列接続された第２発光ダイオード駆動回路とを備え、たとえば昼間と夜間のように計器の照度が異なる駆動回路間において、計器を照明する発光ダイオードの輝度に差が生じないようにバランスをとるように構成されている。 As a lighting device for a vehicle instrument, for example, one described in Patent Document 1 is known.
The illumination device described in Patent Document 1 includes a plurality of first light emitting diode driving circuits in which a plurality of light emitting diodes for illuminating a meter and a first current limiting resistor are connected in series, and these first light emitting diode driving circuits in parallel. A second light emitting diode drive circuit connected in series with a smaller number of light emitting diodes and a second current limiting resistor than the first light emitting diode drive circuit, for example, driving with different illuminance of the instrument such as daytime and nighttime Between the circuits, the light emitting diodes that illuminate the meter are balanced so that there is no difference in luminance.

このような構成を有する車両計器用照明装置は、たとえば液晶表示デバイス（ＬＣＤ）を含む時計表示部の直下で、複数の発光ダイオード（ＬＥＤ）を使用したいわゆるバックライト照明方法に適合した形態で用いられる。
特開２００４−２２８３８５号公報 The vehicle instrument illumination device having such a configuration is used in a form suitable for a so-called backlight illumination method using a plurality of light emitting diodes (LEDs) immediately below a clock display unit including a liquid crystal display device (LCD), for example. It is done.
JP 2004-228385 A

ところで、上記バックライト照明方法に適用された照明装置においては、同色のＬＥＤが近接配置される。
特に、ＬＥＤ光の色合いが異なる（同色であっても波長が微妙に異なる）のもが近接配置された場合、図１に示すように、色合いの異なるＬＥＤ１〜６を同時タイミングでＤＣ駆動すると、図中「ａ」で示す部分に、色の異なる領域点が発生し、図中「ｂ」で示す隣接ＬＥＤの発光領域と重なりのない領域と色合い微妙に異なる点が発生する。すなわち、光ムラ（色ムラ）が発生する。
そこで、従来の照明装置においては、ＬＥＤが直接見えないように、透過性のある乳白色の板に、光の重なる部分または光が重ならない部分に対して濃淡のある着色を施して、光ムラ（色ムラ）を低減させていた。 By the way, in the illuminating device applied to the said backlight illumination method, LED of the same color is arrange | positioned closely.
In particular, when LED lights having different hues (having slightly different wavelengths even if they are the same color) are arranged close to each other, as shown in FIG. 1, when LEDs 1 to 6 having different hues are DC-driven at the same time, In the part indicated by “a” in the figure, an area point having a different color is generated, and a point slightly different from the light emitting area of the adjacent LED indicated by “b” in the figure and a non-overlapping area is generated. That is, light unevenness (color unevenness) occurs.
Therefore, in the conventional lighting device, the transparent milky white plate is colored so that the portion where the light overlaps or the portion where the light does not overlap, so that the LED is not directly visible, and light unevenness ( Color unevenness) was reduced.

上記したように、従来の照明装置においては、ＬＥＤの点灯タイミングが同時であるため、乳白色の板に着色を施していた。
ところが、着色は印刷によって行われるため、印刷時の印刷ムラ、インクの濃淡ズレの方がＬＥＤ光の色合いよりばらつくため、照明光（色味）の均一性をとるのが困難であった。 As described above, in the conventional lighting device, since the lighting timing of the LEDs is the same, the milky white plate is colored.
However, since coloring is performed by printing, the printing unevenness at the time of printing and the density deviation of the ink are more varied than the shade of the LED light, so it is difficult to obtain uniform illumination light (color).

本発明の目的は、透過性の板等の着色を施すことなく色ムラの発生を防止でき、照明の均一化を図ることが可能な照明装置を提供することにある。   An object of the present invention is to provide an illuminating device that can prevent the occurrence of color unevenness without coloring a transparent plate or the like and can achieve uniform illumination.

本発明の第１の観点は、被照明部を照明する照明装置であって、所定間隔をおいて配列される複数の発光ダイオードと、上記複数の発光ダイオードのうちの隣接する発光ダイオードの光が重ならないように上記複数の発光ダイオードを駆動して上記被照明部を照明する発光ダイオード駆動回路とを有する。   A first aspect of the present invention is an illumination device that illuminates a portion to be illuminated, in which light from a plurality of light emitting diodes arranged at a predetermined interval and an adjacent light emitting diode among the plurality of light emitting diodes is emitted. A light emitting diode driving circuit that drives the plurality of light emitting diodes so as not to overlap and illuminates the illuminated portion.

好適には、上記発光ダイオード駆動回路は、発光素子配列の奇数番と偶数番の発光素子を交互に駆動する。   Preferably, the light emitting diode driving circuit alternately drives odd-numbered and even-numbered light emitting elements in the light emitting element array.

好適には、上記発光ダイオード駆動回路は、複数の発光ダイオードを１個ずつ順次に駆動する。   Preferably, the light emitting diode driving circuit sequentially drives a plurality of light emitting diodes one by one.

好適には、複数の発光ダイオードを含む第１および第２の発光ダイオード群を有し、上記第１の発ダイオード群と上記第２の発光ダイオード群との間は遮光され、上記発光ダイオード駆動回路は、上記第１の発光ダイオード群の複数の発光ダイオードを第１の駆動信号で順次に駆動し、上記第２の発光ダイオード群の複数の発光ダイオードを上記第１の駆動信号とデューティの異なる第２の駆動信号で駆動する。   Preferably, the light emitting diode driving circuit includes first and second light emitting diode groups including a plurality of light emitting diodes, wherein light shielding is provided between the first light emitting diode group and the second light emitting diode group. Sequentially drives the plurality of light emitting diodes of the first light emitting diode group with a first drive signal, and the plurality of light emitting diodes of the second light emitting diode group have a duty different from that of the first drive signal. Driven with a drive signal of 2.

好適には、上記複数の発光ダイオードは、色合いが異なる同色系の光を発光する。   Preferably, the plurality of light emitting diodes emit light of the same color having different hues.

好適には、上記被照明部は、液晶表示デバイスであって、上記複数の発光ダイオードの配列位置と上記液晶デバイス間に、透過性の拡散板が配置されている。   Preferably, the illuminated portion is a liquid crystal display device, and a transmissive diffusion plate is disposed between the arrangement position of the plurality of light emitting diodes and the liquid crystal device.

本発明によれば、液晶直下の照明に対して、光ムラ（色ムラ）対策として、透過性のある乳白色板に着色する必要がなくなり、照明（色合い）の均一化を図ることができる。   According to the present invention, it is not necessary to color a translucent milky white plate as a countermeasure against light unevenness (color unevenness) with respect to the illumination directly under the liquid crystal, and it is possible to make the illumination (color shade) uniform.

以下、本発明の実施形態を、図面に関連付けて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図２は本実施形態に係る照明装置が適用されるＬＣＤ（液晶表示デバイス）時計表示部の全体構成を示す図である。   FIG. 2 is a diagram illustrating an overall configuration of an LCD (liquid crystal display device) clock display unit to which the illumination device according to the present embodiment is applied.

ＬＣＤ時計表示部１０は、図２に示すように、回路基板１１、回路基板１１に搭載された照明装置１２、回路基板１１に脱着可能なＬＣＤホルダ１３、ＬＣＤホルダ１３に着脱可能に配置される被照明部としてのＬＣＤ１４、およびホルダ１３の上面とＬＣＤ１４の下面との間に配置される透過性乳白色板材からなる拡散板１５を有している。   As shown in FIG. 2, the LCD clock display unit 10 is detachably disposed on the circuit board 11, the illumination device 12 mounted on the circuit board 11, the LCD holder 13 detachable from the circuit board 11, and the LCD holder 13. It has LCD14 as a to-be-illuminated part, and the diffusion plate 15 which consists of a transparent milky white board | plate material arrange | positioned between the upper surface of the holder 13, and the lower surface of LCD14.

回路基板１１には、照明装置１２が複数のＬＥＤ（発光ダイオード）１２１−１〜１２１−ｎ（図２の例においては、ｎ＝１２）および後で詳述するＬＥＤ駆動回路（１２２）が実装されている。
また、回路基板１１には、ＬＣＤ１４の複数の接続端子と接続するコネクタ部１１１が実装されている。
また、回路基板１１には、ＬＣＤ１４の駆動系も実装される。 On the circuit board 11, a lighting device 12 is mounted with a plurality of LEDs (light emitting diodes) 121-1 to 121-n (n = 12 in the example of FIG. 2) and an LED drive circuit (122) described in detail later. Has been.
The circuit board 11 is mounted with a connector portion 111 that is connected to a plurality of connection terminals of the LCD 14.
The circuit board 11 is also mounted with a drive system for the LCD 14.

照明装置１２は、複数のＬＥＤ１２１（−１〜−ｎ）とＬＥＤ駆動回路１２２により構成される。
ＬＥＤ１２１−１〜１２１−ｎは、回路基板１１において直線状にＬＣＤ１４の長手方向に所定間隔をおいて直線状に配置されている。
このＬＥＤ配列に対応するホルダ１３には、ＬＣＤ１４を照明可能に図示しない開口部が形成されている。
各ＬＥＤ１２１−１〜１２１−ｎは、電流値により光量および発光色が違ってくるため、ＬＥＤＭＡＸとし、ＬＥＤ光が最大（ＩＦＭＡＸ）状態に回路抵抗を設定し、デューティにより明るさが決定される。
また、本実施形態のＬＥＤ駆動回路１２２は、複数のＬＥＤ１２１−１〜１２１−ｎの発光駆動を行う場合、２個の色味が微妙に異なるＬＥＤが隣接し、かつ、近接して配置された場合に、光の重なりが無く点灯させることにより、色ムラを低減する駆動方法を採用している。 The illuminating device 12 includes a plurality of LEDs 121 (−1 to −n) and an LED drive circuit 122.
The LEDs 121-1 to 121-n are linearly arranged on the circuit board 11 in a straight line at a predetermined interval in the longitudinal direction of the LCD 14.
The holder 13 corresponding to this LED array is formed with an opening (not shown) so that the LCD 14 can be illuminated.
Since each LED 121-1 to 121-n has a light amount and a light emission color that vary depending on a current value, the LED resistance is set to LEDMAX, the circuit resistance is set to a maximum (IFMAX) state, and the brightness is determined by the duty.
Further, in the LED driving circuit 122 of the present embodiment, when performing light emission driving of the plurality of LEDs 121-1 to 121-n, two LEDs having slightly different colors are adjacent to each other and arranged close to each other. In this case, a driving method that reduces color unevenness by lighting without overlapping of light is adopted.

以下に、この色ムラを低減する駆動方法を採用したＬＥＤ駆動回路の第１〜第３の構成例について、図面に関連付けて説明する。   Below, the 1st-3rd structural example of the LED drive circuit which employ | adopted the drive method which reduces this color nonuniformity is demonstrated in relation to drawing.

図３は、本実施形態のＬＥＤ駆動回路の第１の構成例を示す回路図である。図４は、図３のＬＥＤ駆動回路の駆動信号の波形図である。また、図５は、図３のＬＥＤ駆動回路の駆動原理を示す図である。   FIG. 3 is a circuit diagram showing a first configuration example of the LED drive circuit of the present embodiment. FIG. 4 is a waveform diagram of drive signals of the LED drive circuit of FIG. FIG. 5 is a diagram showing a driving principle of the LED driving circuit of FIG.

図３のＬＥＤ駆動回路１２２Ａにおいては、理解を容易にするために、６個のＬＥＤ１２１−１〜１２１−６を搭載した例を示している。
ＬＥＤ駆動回路１２２Ａは、６個のＬＥＤ１２１−１〜１２１−６に加えて、各ＬＥＤ１２１−１〜１２１−６のアノード側が並列に接続された電源（電池）Ｖ１２、各ＬＥＤ１２１−１〜１２１−６のカソードに直列に接続された抵抗素子Ｒ１〜Ｒ６、ｎｐｎトランジスタからなる駆動トランジスタＴＲ１，ＴＲ２、インバータＩＮＶ１２２、駆動トランジスタＴＲ１のベースと駆動信号ＳＤＲＶの入力ライン間に接続された抵抗素子Ｒ７、駆動トランジスタＴＲ１のベース・エミッタ間に接続された抵抗素子Ｒ８、駆動トランジスタＴＲ２のベースとインバータＩＮＶ１２２の反転駆動信号ＳＤＲＶＸの出力ライン間に接続された抵抗素子Ｒ９、および駆動トランジスタＴＲ２のベース・エミッタ間に接続された抵抗素子Ｒ１０を有している。 In the LED drive circuit 122A of FIG. 3, for ease of understanding, an example in which six LEDs 121-1 to 121-6 are mounted is shown.
In addition to the six LEDs 121-1 to 121-6, the LED drive circuit 122A includes a power source (battery) V12 in which the anode sides of the LEDs 121-1 to 121-6 are connected in parallel, and the LEDs 121-1 to 121-6. Resistive elements R1 to R6 connected in series to the cathode of the driving transistor TR1, TR2 composed of npn transistors, inverter INV122, resistive element R7 connected between the base of the driving transistor TR1 and the input line of the driving signal SDRV, the driving transistor A resistance element R8 connected between the base and emitter of TR1, a resistance element R9 connected between the base of the driving transistor TR2 and the output line of the inverted driving signal SDRVX of the inverter INV122, and a connection between the base and emitter of the driving transistor TR2. Having a resistance element R10 That.

ＬＥＤ駆動回路１２２Ａにおいて、ＬＥＤ配列の奇数番のＬＥＤ１２１−１，１２１−３，１２１−５のカソードに一端側が接続された抵抗素子Ｒ１，Ｒ３，Ｒ５の他端側が共通に接続されてノードＮＤ１が構成され、ＬＥＤ配列の偶数番のＬＥＤ１２１−２，１２１−４，１２１−６のカソードに一端側が接続された抵抗素子Ｒ２，Ｒ４，Ｒ６の他端側が共通に接続されてノードＮＤ２が構成されている。
そして、駆動トランジスタＴＲ１のベースが抵抗素子Ｒ７を介して駆動信号ＳＤＲＶの入力ラインに接続され、エミッタが接地され、コレクタがＬＥＤ配列の奇数番の共通ノードＮＤ１に接続されている。
駆動トランジスタＴＲ２のベースが抵抗素子Ｒ９を介して反転駆動信号ＳＤＲＶＸの入力ラインに接続され、エミッタが接地され、コレクタがＬＥＤ配列の偶数番の共通ノードＮＤ２に接続されている。 In the LED driving circuit 122A, the other ends of the resistance elements R1, R3, R5 having one end connected to the cathodes of the odd-numbered LEDs 121-1, 121-3, 121-5 in the LED array are connected in common, and the node ND1 is connected. The node ND2 is configured by commonly connecting the other ends of the resistance elements R2, R4, and R6 having one end connected to the cathodes of the even-numbered LEDs 121-2, 121-4, and 121-6 in the LED array. Yes.
The base of the drive transistor TR1 is connected to the input line of the drive signal SDRV via the resistor element R7, the emitter is grounded, and the collector is connected to the odd-numbered common node ND1 in the LED array.
The base of the drive transistor TR2 is connected to the input line of the inverted drive signal SDRVX via the resistor element R9, the emitter is grounded, and the collector is connected to the even-numbered common node ND2 of the LED array.

すなわち、図３のＬＥＤ駆動回路１２２Ａは、図５に示すように、ＬＥＤ配列の奇数番のＬＥＤ１２１−１，１２１−３，１２１−５を一括的に発光駆動し、次いで、偶数番のＬＥＤ１２１−２，１２１−４，１２１−６を一括的に発光駆動する。
この一連の動作を順次行い、残光現象により均一な色味を認識できるように複数のＬＥＤの発光駆動を行う。
その結果、複数のＬＥＤを光の重なり無く点灯させることで、色合いの異なる箇所が無くなり、色ムラを低減することが可能となっている。 That is, as shown in FIG. 5, the LED drive circuit 122A in FIG. 3 collectively drives the odd-numbered LEDs 121-1, 121-3, 121-5 in the LED array to emit light, and then the even-numbered LEDs 121- 2, 121-4 and 121-6 are driven to emit light collectively.
A series of operations are sequentially performed, and a plurality of LEDs are driven to emit light so that a uniform color can be recognized by the afterglow phenomenon.
As a result, by turning on a plurality of LEDs without overlapping light, there are no portions with different hues, and color unevenness can be reduced.

図６は、本実施形態のＬＥＤ駆動回路の第２の構成例を示す回路図である。図７は、図６のＬＥＤ駆動回路の駆動信号の波形図である。また、図８は、図６のＬＥＤ駆動回路の駆動原理を示す図である。   FIG. 6 is a circuit diagram showing a second configuration example of the LED drive circuit of the present embodiment. FIG. 7 is a waveform diagram of drive signals of the LED drive circuit of FIG. FIG. 8 is a diagram showing a driving principle of the LED driving circuit of FIG.

図６のＬＥＤ駆動回路１２２Ｂは、ｎ個のＬＥＤ１２１−１〜１２１−ｎごとに駆動トランジスタＴＲ１〜ＴＲｎを設けるとともに、各ＬＥＤｎ進カウンタＣＮＴ１２２を設け、このカウンタ１２２１に入力クロックＣＬＫを入力して、各駆動トランジスタＴＲ１〜ＴＲｎの駆動信号ＳＤＲＶ１〜ＳＤＲＶｎを異なるタイミングで順次発生し、ｎ個のＬＥＤ１２１−１〜１２１−ｎを１個ずつ順次発光させるように構成されている。
このＬＥＤ駆動装置１２２Ｂによっても、複数のＬＥＤを光の重なり無く点灯させることで、色合いの異なる箇所が無くなり、色ムラを低減することが可能となっている。 The LED drive circuit 122B of FIG. 6 includes drive transistors TR1 to TRn for each of the n LEDs 121-1 to 121-n, and also includes respective LEDn base counters CNT122. The input clock CLK is input to the counter 1221, The drive signals SDRV1 to SDRVn of the drive transistors TR1 to TRn are sequentially generated at different timings, and the n LEDs 121-1 to 121-n are sequentially emitted one by one.
Also by this LED driving device 122B, by turning on a plurality of LEDs without overlapping light, there are no portions with different hues, and color unevenness can be reduced.

図９は、本実施形態のＬＥＤ駆動回路の第３の構成例を示す回路図である。図１０は、図９のＬＥＤ駆動回路の駆動信号の波形図である。また、図１１は、図９のＬＥＤ駆動回路の駆動原理を示す図である。   FIG. 9 is a circuit diagram showing a third configuration example of the LED drive circuit of the present embodiment. FIG. 10 is a waveform diagram of drive signals of the LED drive circuit of FIG. FIG. 11 is a diagram showing a driving principle of the LED driving circuit of FIG.

図９のＬＥＤ駆動回路１２２Ｃは基本的には図６のＬＥＤ駆動回路１２２Ｂと同様であるが、一枚の基板上に２種類の明るさを必要とする照明に対応可能な構成となっている。
図１１に示すように、遮光板１２２１を境にＬＥＤ１２１Ａ−１〜１２１Ａ−ｎと１２１Ｂ−１〜１２１Ｂ−ｎをデューティの異なる駆動信号によって順次１個のＬＥＤを発光させることにより、両側の色ムラの低減を図っている。
なお、デューティの異なる駆動信号は、ｎ進カウンタＣＮＴ１２２で生成されるＬＥＤ１２１Ａ−１〜１２１Ａ−ｎ用の第１の駆動信号ＳＲＤＶ１Ａ〜ＳＤＲＶｎＡと、入力クロックＣＬＫとをＡＮＤゲートＡ１〜Ａｎにより生成し、１２１Ｂ−１〜１２１Ｂ−ｎごとに対応して設けられる駆動トランジスタＴＲ１Ｂ〜ＴＲｎＢに供給する第２の駆動信号ＳＲＤＶ１Ｂ〜ＳＤＲＶｎＢを生成している。
このＬＥＤ駆動装置１２２Ｃによっても、複数のＬＥＤを光の重なり無く点灯させることで、色合いの異なる箇所が無くなり、色ムラを低減することが可能となっている。 The LED drive circuit 122C in FIG. 9 is basically the same as the LED drive circuit 122B in FIG. 6, but is configured to be compatible with illumination that requires two types of brightness on a single substrate. .
As shown in FIG. 11, the LEDs 121A-1 to 121A-n and 121B-1 to 121B-n are caused to emit light sequentially by driving signals having different duties with the light shielding plate 1221 as a boundary, thereby causing color unevenness on both sides. We are trying to reduce it.
The drive signals having different duties are generated by AND gates A1 to An using the first drive signals SRDV1A to SDRVnA for the LEDs 121A-1 to 121A-n generated by the n-ary counter CNT122 and the input clock CLK, Second drive signals SRDV1B to SDRVnB supplied to the drive transistors TR1B to TRnB provided corresponding to the respective 121B-1 to 121B-n are generated.
Also by this LED driving device 122C, by turning on a plurality of LEDs without overlapping light, there are no portions with different hues, and color unevenness can be reduced.

以上のように、本実施形態によれば、ＬＥＤ駆動回路１２２は、複数のＬＥＤ１２１−１〜１２１−ｎの発光駆動を行う場合、２個の色味が微妙に異なるＬＥＤが隣接し、かつ、近接して配置された場合に、光の重なりが無くなるように、奇数番、偶数番のＬＥＤを交互に、あるいは、１個ずつ順次に点灯させることから、液晶直下の照明に対して、光ムラ（色ムラ）対策として、透過性のある乳白色板に着色する必要がなくなり、照明（色合い）の均一化を図ることができる。   As described above, according to the present embodiment, when the LED driving circuit 122 performs light emission driving of the plurality of LEDs 121-1 to 121-n, two LEDs having slightly different colors are adjacent to each other, and When the LEDs are arranged close to each other, the odd-numbered and even-numbered LEDs are turned on alternately or sequentially one by one so that there is no overlap of light. As a countermeasure against (color unevenness), there is no need to color a transparent milky white plate, and the illumination (color shade) can be made uniform.

従来の照明装置の課題を説明するための図である。It is a figure for demonstrating the subject of the conventional illuminating device. 本実施形態に係る照明装置が適用されるＬＣＤ（液晶表示デバイス）時計部の全体構成を示す図である。It is a figure which shows the whole structure of the LCD (liquid crystal display device) clock part to which the illuminating device concerning this embodiment is applied. 本実施形態のＬＥＤ駆動回路の第１の構成例を示す回路図である。It is a circuit diagram which shows the 1st structural example of the LED drive circuit of this embodiment. 図３のＬＥＤ駆動回路の駆動信号の波形図である。FIG. 4 is a waveform diagram of drive signals of the LED drive circuit of FIG. 3. 図３のＬＥＤ駆動回路の駆動原理を示す図である。It is a figure which shows the drive principle of the LED drive circuit of FIG. 本実施形態のＬＥＤ駆動回路の第２の構成例を示す回路図である。It is a circuit diagram which shows the 2nd structural example of the LED drive circuit of this embodiment. 図６のＬＥＤ駆動回路の駆動信号の波形図である。It is a wave form diagram of the drive signal of the LED drive circuit of FIG. 図６のＬＥＤ駆動回路の駆動原理を示す図である。It is a figure which shows the drive principle of the LED drive circuit of FIG. 本実施形態のＬＥＤ駆動回路の第３の構成例を示す回路図である。It is a circuit diagram which shows the 3rd structural example of the LED drive circuit of this embodiment. 図９のＬＥＤ駆動回路の駆動信号の波形図である。FIG. 10 is a waveform diagram of drive signals of the LED drive circuit of FIG. 9. 図９のＬＥＤ駆動回路の駆動原理を示す図である。It is a figure which shows the drive principle of the LED drive circuit of FIG.

符号の説明Explanation of symbols

１０・・・ＬＣＤ時計表示部、１１・・・回路基板、１２・・・照明装置、１２１−１〜１２１−ｎ，１２１−１Ａ〜１２１−ｎＢ・・・ＬＥＤ、ＴＲ１〜ＴＲｎ・・・駆動トランジスタ、１２２，１２２Ａ〜１２２Ｃ・・・ＬＥＤ駆動回路、１３・・・ＬＣＤホルダ、１４・・・ＬＣＤ、１５・・・拡散板。

DESCRIPTION OF SYMBOLS 10 ... LCD clock display part, 11 ... Circuit board, 12 ... Illumination device, 121-1-121-n, 121-1A-121-nB ... LED, TR1-TRn ... Drive Transistor 122, 122A-122C ... LED drive circuit, 13 ... LCD holder, 14 ... LCD, 15 ... Diffuser.

Claims (6)

被照明部を照明する照明装置であって、
所定間隔をおいて配列される複数の発光ダイオードと、
上記複数の発光ダイオードのうちの隣接する発光ダイオードの光が重ならないように上記複数の発光ダイオードを駆動して上記被照明部を照明する発光ダイオード駆動回路と
を有する照明装置。 An illumination device that illuminates an illuminated part,
A plurality of light emitting diodes arranged at predetermined intervals;
A light-emitting diode driving circuit that drives the plurality of light-emitting diodes to illuminate the illuminated portion so that light from adjacent light-emitting diodes among the plurality of light-emitting diodes does not overlap. 上記発光ダイオード駆動回路は、発光素子配列の奇数番と偶数番の発光素子を交互に駆動する
請求項１記載の照明装置。 The lighting device according to claim 1, wherein the light-emitting diode driving circuit alternately drives odd-numbered and even-numbered light-emitting elements in a light-emitting element array. 上記発光ダイオード駆動回路は、複数の発光ダイオードを１個ずつ順次に駆動する
請求項１記載の照明装置。 The lighting device according to claim 1, wherein the light emitting diode driving circuit sequentially drives the plurality of light emitting diodes one by one. 複数の発光ダイオードを含む第１および第２の発光ダイオード群を有し、
上記第１の発ダイオード群と上記第２の発光ダイオード群との間は遮光され、
上記発光ダイオード駆動回路は、上記第１の発光ダイオード群の複数の発光ダイオードを第１の駆動信号で順次に駆動し、上記第２の発光ダイオード群の複数の発光ダイオードを上記第１の駆動信号とデューティの異なる第２の駆動信号で駆動する
請求項３記載の照明装置。 Having first and second light emitting diode groups including a plurality of light emitting diodes;
Light shielding is provided between the first light emitting diode group and the second light emitting diode group,
The light emitting diode driving circuit sequentially drives a plurality of light emitting diodes of the first light emitting diode group with a first driving signal, and drives the plurality of light emitting diodes of the second light emitting diode group to the first driving signal. The lighting device according to claim 3, wherein the lighting device is driven by a second drive signal having a different duty. 上記複数の発光ダイオードは、色合いが異なる同色系の光を発光する
請求項１から４のいずれか一に記載の照明装置。 The lighting device according to any one of claims 1 to 4, wherein the plurality of light emitting diodes emit light of the same color having different colors. 上記被照明部は、液晶表示デバイスであって、
上記複数の発光ダイオードの配列位置と上記液晶デバイス間に、透過性の拡散板が配置されている
請求項１から５のいずれか一に記載の照明装置。




The illuminated part is a liquid crystal display device,
The illuminating device according to any one of claims 1 to 5, wherein a transmissive diffusion plate is disposed between an arrangement position of the plurality of light emitting diodes and the liquid crystal device.




JP2005191079A 2005-06-30 2005-06-30 Lighting device Expired - Fee Related JP4570521B2 (en)

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Publication number Priority date Publication date Assignee Title
JP2011249087A (en) * 2010-05-25 2011-12-08 Sanyo Electric Co Ltd Display device

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Publication number Priority date Publication date Assignee Title
JP2002373795A (en) * 2001-06-14 2002-12-26 Omron Corp Led backlight device
WO2004032235A2 (en) * 2002-09-30 2004-04-15 Siemens Aktiengesellschaft Device for producing a bundled light flux
WO2004068182A2 (en) * 2003-01-24 2004-08-12 Digital Optics International Corporation High density illumination system
JP2005100799A (en) * 2003-09-25 2005-04-14 Osram-Melco Ltd Variable color light emitting diode module and variable color light emitting diode luminaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002373795A (en) * 2001-06-14 2002-12-26 Omron Corp Led backlight device
WO2004032235A2 (en) * 2002-09-30 2004-04-15 Siemens Aktiengesellschaft Device for producing a bundled light flux
WO2004068182A2 (en) * 2003-01-24 2004-08-12 Digital Optics International Corporation High density illumination system
JP2005100799A (en) * 2003-09-25 2005-04-14 Osram-Melco Ltd Variable color light emitting diode module and variable color light emitting diode luminaire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011249087A (en) * 2010-05-25 2011-12-08 Sanyo Electric Co Ltd Display device

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