TW201304207A - Illumination device - Google Patents

Abstract

An illumination device is provided. The illumination device includes a base plate, a plurality of semiconductor light emitting elements, and at least one first CCT compensation sticker. The base plate has a first surface and a second surface opposite to the first surface. The semiconductor light emitting elements are separately disposed at the first surface. The first CCT compensation sticker is stuck to the first surface where is not arranged by the semiconductor light emitting elements.

Description

Illuminating device

The present invention relates to a light-emitting device, and more particularly to a light-emitting device that utilizes a color temperature compensation patch to adjust an illumination spectrum that adjusts the final color temperature (chroma) of the illumination device.

Currently, a light-emitting device using a semiconductor light-emitting element as a light source often has a problem of color shift. If two semiconductor light-emitting elements having significantly different color temperatures (CCT, Correlated Color Temperature) are used to illuminate an observer, the color temperature is perceived by the naked eye. Differences in aspects are often objectionable. The reason for this problem is not that the components therein are malfunctioning, but the color temperature of the semiconductor light-emitting element itself is difficult to control the same quality, causing the semiconductor light-emitting elements to emit light having different color temperatures.

The color temperature is defined as follows. The International Commission on Illumination (CIE) provides a two-dimensional coordinate space color chromaticity diagram as a measure of chromaticity, through appropriate numerical conversion, two-dimensional coordinate color The color metric on the degree space map can be converted to a color temperature magnitude. Among them, when the value of the X-axis of the graph (CIEx) increases and the value of the Y-axis of the graph (CIEy) increases, the viewer will feel the relative proportion of yellow-red light increases, that is, the color temperature decreases, for example, the sky color temperature is about 3000K in the evening. Conversely, as CIEx decreases and CIEy decreases, the viewer will experience an increase in the relative proportion of blue light, ie, an increase in color temperature, such as a sky color temperature of approximately 6500K at noon.

In the prior art, the method of adjusting the color temperature of the semiconductor element tends to control the production standard of the semiconductor light-emitting element in a more severe manner, so that the semiconductor light-emitting element just shipped has a uniform and ideal color temperature. However, this method eliminates too many products due to excessive product certification standards, resulting in higher production costs. Therefore, a technique that can improve the color temperature of light at a lower cost is highly demanded.

In order to improve the lack of conventional techniques, the present invention therefore proposes a method of utilizing a color temperature compensation patch to adjust the illumination spectrum of the illumination device.

An object of the present invention is to provide a light emitting device comprising: a substrate, a plurality of semiconductor light emitting elements, and one or more first color temperature compensation patches. The substrate has a first surface and a second surface facing away from the first surface, and the semiconductor light emitting elements are spaced apart from the first surface of the substrate. The first color temperature compensation patch is attached to the first surface that is not occupied by the semiconductor light emitting element.

Another object of the present invention is to provide a light emitting device comprising: a substrate, a plurality of semiconductor light emitting elements, and a housing. The substrate has a first surface and a second surface that faces away from the first surface. The semiconductor light emitting elements are spaced apart from each other on the first surface of the substrate. The housing is configured to cover the first surface of the substrate, wherein the surface of the housing is attached with one or more first color temperature compensation patches.

In one embodiment, the light emitting device further includes one or more second color temperature compensation patches attached to the first surface of the substrate or the inner and outer sides of the surface of the housing.

In a specific embodiment, the color temperature compensation patch contained in the color temperature compensation patch is irradiated with light emitted from the semiconductor light emitting element, and the wavelength of the light beam is equivalently increased, and the blue light ratio is reduced to achieve a red shift (reducing the color temperature of the light emitting device). A conversion substance, or a wavelength converting substance equivalently capable of reducing the wavelength of light and relatively increasing the ratio of blue light to achieve a blue shift (increasing the color temperature of the light-emitting device). Wherein, the color temperature compensation patch comprises the following materials: a wavelength conversion substance such as a dye, a fluorescent substance or a phosphorescent substance which can compensate the wavelength of the color temperature.

With the color temperature compensation patch of the light-emitting device of the present invention, the light of the semiconductor light-emitting element can be adjusted to a certain extent before reaching the illumination target, so that the illumination target receives the light chromaticity and color temperature with high uniformity.

The preferred embodiment of the invention is described in conjunction with the drawings.

1A and 1B, FIG. 1A is a top view showing a first embodiment of the illumination device 1 of the present invention, and FIG. 1B is a cross-sectional view showing a-a section line in FIG. 1A. In a specific embodiment, the light-emitting device 1 includes a substrate 10, a plurality of semiconductor light-emitting elements 20a, 20b, 20c, and 20d, three first color temperature compensation patches 31a, 31b, and 31c, and a second color temperature compensation patch 32a. .

The substrate 10 is a circuit board having a first surface 11 and a second surface 12 opposite to the first surface 11, wherein the first surface 11 is provided with circuitry for transmitting the power required for the components disposed thereon and Signal. In this embodiment, the substrate 10 is a rectangular flat plate having two short sides and two long sides, but the shape of the substrate 10 should not be limited.

The semiconductor elements 20a, 20b, 20c, and 20d are Light Emitting Diodes. In this embodiment, the LEDs 20a, 20b, 20c, and 20d are spaced apart by Surface Mount Technology (SMT). The first surface 11 of the substrate 10 is disposed. Since the light-emitting diodes 20a, 20b, 20c, 2Od is difficult to control the color temperature of light emission by itself in the same quality, resulting in light-emitting diodes 20a, 20b has issued a high color temperature (bluish) of the light L _H, a light emitting diode 20c A light L _I having a desired color temperature is emitted, and the light emitting diode 20d emits a light L _L having a lower color temperature (reddish color).

It should be noted that although the light-emitting diodes 20a, 20b, 20c, and 20d of the present invention are disposed on the first surface 11 of the substrate 10 by the SMT packaging technology, the light-emitting diodes 20a, 20b, 20c, and 20d may also be It is disposed on the surface of the substrate 10 by other packaging techniques such as COB (Chip on Board).

The first color temperature compensation patches 31a, 31b, 31c are yellow in appearance from the outside, and one surface thereof is coated with an adhesive, which can be repeatedly attached to the unoccupied LEDs 20a, 20b, 20c, 20d. On the first surface 11. The first color temperature compensation patches 31a, 31b, 31c have different shapes from each other and are each attached to the edge or first surface 11 of the first surface 11.

In detail, the first color temperature compensation patch 31a is a square patch attached between the LEDs 20a and 20b; the first color temperature compensation patch 31b is an elongated patch attached to the substrate 10. The short edge of the edge is close to the position of the light emitting diode 20; the first color temperature compensation patch 31c is an elongated patch attached to the long edge of the substrate 10. Further, the first color temperature compensation patches 31a, 31b, and 31c contain at least one wavelength converting substance including a yellow dye, a fluorescent substance (inorganic material), or a phosphorescent substance (organic material).

The second color temperature compensation patch 32a is blue in appearance, and has a surface coated with an adhesive coating, which can be repeatedly attached to the unlit LEDs 20a, 20b, 20c, 20d and the first color temperature compensation patch. On the first surface 11 occupied by the sheets 31a, 31b, and 31c, in this embodiment, the second color temperature compensation patch 32a is a triangular patch, and the second color temperature compensation patch 32a is attached to the short side of the substrate 10 near the light emitting The position of the pole body 20d. The second color temperature compensation patch 32a contains a blue dye or a blue phosphor. The blue phosphor referred to herein is a non-linear effect phosphor which is excited by a long wavelength of light to produce a short wavelength of light.

It is to be noted that, as shown in FIG. 1B, the light-emitting diodes 20a-d and the color-temperature compensation patches 31a-c, 32a are all disposed on the first surface 11, and the thickness of the LEDs 20a-d is The color temperature compensation patches 31a to c, 32a are disposed below the light emitting diodes 20a to 32d, as viewed from the horizontal direction.

When each of the light-emitting diodes 20a, 20b, 20c, 20d emits a light source, the light ray L _H emitted by the partial light-emitting diode 20a having a higher color temperature (bluish) is incident on the first color temperature compensation on both sides thereof. The patches 31a, 31b, and the light L _L emitted by the partial light-emitting diodes 20d having a lower color temperature (yellow or red) are incident on the second color temperature compensation patch 32a.

Affected by a wavelength conversion substance such as a yellow-red dye, a yellow-red fluorescent substance or a phosphorescent substance in the first color temperature compensation patches 31a and 31b, the first color temperature compensation patches 31a and 31b are equivalently up-converted to have a higher color temperature ( The blue light has a wavelength of light L _H to a long wavelength light spectrum, so that the light L _H having a higher color temperature (bluish) reduces the blue light ratio and red shifts to a light L _I having a desired color temperature.

More specifically, by the first color compensating patch 31a, 31b of the impact, part of the light L _H having a higher color temperatures of color temperature (bluish) of the compensation is obtained. The yellow phosphor in the first color temperature compensation patches 31a, 31b is excited by the light L _H to generate light having a longer wavelength (for example, yellow red light), and the values of CIEx and CIEy of the light L _{H are} increased. In addition, red and yellow part of the blue dye absorbs the light in L _H, thereby increasing the relative proportion of L _H in yellow light.

Similarly, the second color temperature compensation patch 32a is equivalently upconverted to have a lower color temperature (yellow or red) due to the wavelength conversion substance such as blue dye or blue phosphor in the second color temperature compensation patch 32a. The wavelength of the light L _L to the short-wavelength light spectrum causes the light L _L having a lower color temperature (yellow or red) to increase the blue light ratio, and blue to a light L _I having a desired color temperature.

More specifically, the color temperature of a portion of the light L _L having a lower color temperature (yellow or red) is compensated by the influence of the second color temperature compensation patch 32a. The blue phosphor in the second color temperature compensation patch 32a is excited by the light L _H to generate light having a shorter wavelength (for example, blue light), and reduces the values of the CIEx and CIEy of the light L _L . In addition, the blue dye absorbs part of the yellow-red light in the light L _L , thereby increasing the relative proportion of blue light in the light L _L .

On the other hand, since the light-emitting diode 20c has emitted the light L _{I of} a desired color temperature, it is not necessary to additionally compensate the color temperature thereof. By the above mechanism, most of the light emitted by the LEDs 20a, 20b, 20c, 20d will be adjusted to a certain extent before reaching the illumination target, so that the color temperature of the light received by the illumination target has a high degree of uniformity.

Referring to Figure 2, there is shown a schematic view of a second embodiment of the illumination device 1' of the present invention. The illumination device 1' is different from the illumination device 10 in that the illumination device 1' includes a housing 15 and further includes a second color temperature compensation patch 32b attached to the surface of the housing 15 above the light-emitting diode 20d. In one embodiment, the housing 15 is a light transmissive mask that is disposed on the four edges of the substrate 10 in a snap-fit manner. Further, the second color temperature compensation patch 32b is disposed on the outer surface of the housing 15.

In this embodiment, the light ray L _{H of the} higher color temperature (bluish) emitted by the partial light-emitting diode 20b is reflected by the casing 15 and is incident on the first color temperature compensation patch 31a, and is affected by the wavelength conversion substance therein. The blue light of the light L _H is reduced, causing the relative proportion of yellow red light to increase, and then emitting a light L _I having an ideal color temperature. On the other hand, the light L _{L of the} lower color temperature (reddish) emitted by the partial light-emitting diode 20d is incident on the second color temperature compensation patch 32b attached to the casing 15, and is affected by the wavelength conversion substance therein. The yellow red light of L _L is reduced, causing the relative proportion of blue light to increase, and emitting a light L _I having a desired color temperature.

The light-emitting device of the present invention is not limited by the quality of the light-emitting diode, and the shape, the number, and the attachment position of the color temperature compensation patch can be randomly adjusted according to the color temperature condition of each light-emitting device, thereby achieving the same color temperature between different light-emitting devices. The goal. The user can adjust the color temperature of the light emitted by each of the light-emitting diodes of the light-emitting device, for example, a yellow color temperature compensation patch is densely attached in a region where the color temperature is too high (blue), and the color temperature is slightly high (blue). The area is attached to the yellow color temperature compensation patch in a sparse manner, and vice versa. In addition, the shape of the color temperature compensation patch may be a circular shape, a prism shape, a doughnut shape surrounding the light emitting diode, or a connection of the above various shapes.

The relationship between the components of the present invention and the principle of action have been described and explained in detail above, but it should be noted that the relative position, number, shape and the like of the components described above are not limited to the illustration and the description of the present invention. As shown in the above, the overall content of the present invention should be considered in view of the invention of the present invention.

1, 1’. . . Lighting device

10. . . Substrate

11. . . First surface

12. . . Second surface

15. . . case

20a, 20b, 20c, 20d. . . Semiconductor light-emitting element (light emitting diode)

31a, 31b, 31c. . . First color temperature compensation patch

32a, 32b. . . Second color temperature compensation patch

L _L . . . Light with a lower color temperature (yellow or red)

L _H . . . Light with a higher color temperature (blue)

L _I . . . Light with ideal color temperature

1A is a top view showing a first embodiment of the light-emitting device of the present invention;

Figure 1B shows a cross-sectional view of the a-a section line in Figure 1A;

Fig. 2 is a view showing a second embodiment of the light-emitting device of the present invention.

1'. . . Illuminating device

10. . . Substrate

11. . . First surface

12. . . Second surface

15. . . case

20a, 20b, 20c, 20d. . . Semiconductor light-emitting element (light emitting diode)

31a, 31b, 31c. . . First color temperature compensation patch

32a, 32b. . . Second color temperature compensation patch

L _L . . . Low color temperature light

L _H . . . High color temperature light

L _I . . . Ideal color temperature light

Claims (16)

A light emitting device comprising: a substrate having a first surface and a second surface facing the first surface; a plurality of semiconductor light emitting elements spaced apart from each other on the first surface of the substrate; and one or more The first color temperature compensation patch is attached to the first surface that is not occupied by the semiconductor light emitting elements. The illuminating device of claim 1, wherein the first color temperature compensation patches are attached to a first surface edge of the substrate and/or a first surface between the semiconductor light emitting elements. The illuminating device of claim 2, wherein the first color temperature compensation patch, after being irradiated by the light emitted by the semiconductor illuminating elements, converts the wavelength of the ray to a long wavelength ray spectrum A wavelength converting substance such as a dye, a fluorescent substance, or a phosphorescent substance. The illuminating device of claim 3, wherein the dye absorbs a portion of the blue light in the light, and the fluorescent material is excited by the light to produce a light having a long wavelength. The illuminating device of claim 3, further comprising one or more second color temperature compensation patches attached to the substrate and not occupied by the semiconductor light emitting elements and the first color temperature compensation patch Where. The illuminating device of claim 5, wherein the second color temperature compensation patch contains a dye that converts the wavelength of the light to a short-wavelength light spectrum after being irradiated by the light emitted by the semiconductor light-emitting elements. A wavelength converting substance such as a fluorescent substance or a phosphorescent substance. The illuminating device of claim 6, wherein the dye absorbs a portion of the red light in the light, and the fluorescent material is excited by the light to produce a nonlinear effect and emit a light having a short wavelength. The illuminating device of claim 3, wherein the first color temperature compensation patch and the second color temperature compensation patch may be the same or different. A light emitting device comprising: a substrate having a first surface and a second surface facing the first surface; a plurality of semiconductor light emitting elements spaced apart from the first surface of the substrate; and a housing The first surface of the substrate is coated, and the surface of the casing is attached with one or more first color temperature compensation patches. The illuminating device of claim 9, wherein the first color temperature compensation patch, after being irradiated by the light emitted by the semiconductor illuminating device, converts the wavelength of the ray to a long wavelength ray spectrum A wavelength converting substance such as a dye, a fluorescent substance, or a phosphorescent substance. The illuminating device of claim 10, wherein the dye absorbs a portion of the blue light in the light, and the fluorescent material is excited by the light to produce a light having a long wavelength. The illuminating device of claim 11, further comprising one or more second color temperature compensation patches attached to the first surface not occupied by the semiconductor illuminating elements. The illuminating device of claim 12, wherein the second color temperature compensation patch is attached to the first surface edge of the substrate and/or the first surface between the semiconductor light emitting elements. The illuminating device of claim 12, wherein the second color temperature compensation patch contains a dye that converts the wavelength of the light to a short-wavelength light spectrum after being irradiated by the light emitted by the semiconductor light-emitting devices A wavelength converting substance such as a fluorescent substance or a phosphorescent substance. The illuminating device of claim 14, wherein the dye absorbs a portion of the yellow light in the light, and the fluorescent material is excited by the light to produce a nonlinear effect and emit a light having a short wavelength. The illuminating device of claim 12, wherein the first color temperature compensation patch and the second color temperature compensation patch may be the same or different.