CN103178055B - LED device - Google Patents

Abstract

A light emitting diode device comprises a first adjusting module and a second adjusting module. The first adjusting module comprises at least one first light emitting diode with a first internal resistance, and the first internal resistance has a first characteristic curve. The first characteristic curve covers a region including a first non-fully conducting region and a first conducting region, and the first internal resistance exponentially decays in the first non-fully conducting region as the current increases from a zero value to a high value, and the first conducting region is linear. The second adjusting module comprises an impedance providing element and an electronic element which are connected in series, and the second adjusting module is electrically connected with the first adjusting module in parallel. The second adjusting module has a second internal resistance, and the second internal resistance has a second characteristic curve, wherein the first characteristic curve and the second characteristic curve are matched with each other.

Description

LED device

technical field

The present invention relates to a circuit design of a light emitting diode, and in particular to a structure of a light emitting diode device.

Background technique

Recently, as the manufacturing technology of light emitting diodes (LEDs) improves, the related luminous brightness and luminous efficiency continue to increase, and the application range of light emitting diodes is becoming more and more popular.

Traditionally, in order to drive light-emitting diodes to emit light smoothly and stably, current-limiting resistors are used in circuit design to provide constant current to drive light-emitting diodes to emit light. However, under the traditional driving architecture, when the temperature of the matched LEDs changes, the color temperature of the LEDs will shift. For example, blue LEDs have minimal changes in luminous intensity with temperature changes, and are basically not affected by any temperature changes. When the temperature of green LED rises from 20°C to 80°C, its luminous intensity drops by about 15%. When the temperature of a red LED rises from 20°C to 40°C, its luminous intensity drops by about 15%. Therefore, the degree to which the luminous intensity of red LEDs changes with temperature changes is greater than that of blue LEDs. In other words, the light attenuation characteristics of red LEDs are more serious than those of blue LEDs.

Contents of the invention

In view of this, the present invention proposes a light emitting diode device to solve the problems existing in the prior art.

An embodiment of the present invention provides a light emitting diode device, which includes a first adjustment module and a second adjustment module. The first adjustment module includes at least one first light-emitting diode with a first internal resistance for receiving a first current, and there is a first characteristic curve between the first internal resistance and the first current, and the first characteristic curve covers The region includes the first non-complete conduction region and the first conduction region, and the first internal resistance exhibits exponential decay in the first non-complete conduction region as the first current increases from zero, while in the first conduction region The pass region is linear. The second adjustment module includes impedance providing elements and electronic components connected in series, and the second adjustment module is electrically connected in parallel with the first adjustment module to receive a second current, and the second adjustment module has a second internal resistance, and the second adjustment module There is a second characteristic curve between the internal resistance and the second current, the area covered by the second characteristic curve includes the second incomplete conduction region and the second conduction region, and the second internal resistance changes from zero to zero with the second current When it increases upwards, it shows exponential decay in the second non-complete conduction region, but it shows linearity in the second conduction region. Wherein the first characteristic curve and the second characteristic curve match each other.

In an embodiment of the present invention, the impedance providing element is a positive temperature coefficient semiconductor element or a thermistor.

In an embodiment of the present invention, the electronic component is a diode, Zener diode, LED, diode array, Zener diode array or LED array.

In an embodiment of the invention, the LED device further includes a third adjustment module. The third adjustment module includes at least one second light emitting diode. The third adjustment module is connected in series with the first adjustment module and the second adjustment module respectively.

In an embodiment of the present invention, the first light-emitting diode can excite the first light with the first wavelength, and the second light-emitting diode can excite the second light with the second wavelength, and the first wavelength and the second wave They look different.

In an embodiment of the present invention, the first light emitting diode and the second light emitting diode are red light emitting diodes and blue light emitting diodes respectively.

From another point of view, an embodiment of the present invention provides a light emitting diode device, which includes a first diode array, a second diode array and an impedance providing element connected in series. The first diode array includes a plurality of first light-emitting diodes with a first internal resistance for receiving a first current, and there is a first characteristic curve between the first internal resistance and the first current, and the first characteristic curve The covered area includes the first incomplete conduction region and the first conduction region, and the first internal resistance exhibits an exponential decay in the first incomplete conduction region as the first current increases from zero, and in the first incomplete conduction region The first conduction region is linear. The second diode array and the impedance providing element connected in series are used to be electrically connected in parallel with the first diode array to receive a second current, and the second diode array and the impedance providing element connected in series have a second internal Resistance, and there is a second characteristic curve between the second internal resistance and the second current, the area covered by the second characteristic curve includes the second incomplete conduction region and the second conduction region, and the second internal resistance increases with the first When the second current increases from zero to upward, it exhibits exponential decay in the second non-complete conduction region, and exhibits linearity in the second conduction region. Wherein the first characteristic curve and the second characteristic curve match each other.

In an embodiment of the present invention, the second diode array is an array formed of diodes, Zener diodes or light emitting diodes.

In an embodiment of the invention, the LED device further includes a third diode array. The third diode array includes a plurality of second light-emitting diodes, and the third diode array is connected in series with the first diode array and the second diode array connected in series with the impedance providing element.

Based on the above, the structure of the light-emitting diode device of the present invention adopts the electrical parallel connection of the first adjustment module and the second adjustment module, the first adjustment module has at least one light-emitting diode, and the second adjustment module includes a series impedance providing element and electronic element. The first characteristic curve of the first adjustment module is matched with the second characteristic curve of the second adjustment module, so that the light emitting diode device can be dynamically adjusted to reduce the range of color temperature deviation, and the luminous brightness compensation can be performed at high temperature, So as to avoid the problem of high temperature heat decay.

Based on the above, the present invention also proposes a light emitting diode device, which includes a first light emitting diode array, a second light emitting diode array and an impedance providing element connected in series. The first LED array includes a first internal resistance for receiving a first current, and there is a first characteristic curve between the first internal resistance and the first current. A second LED array connected in series and an impedance providing element are electrically connected in parallel with the first LED array for receiving a second current. The second LED array and the impedance providing element connected in series have a second internal resistance, and there is a second characteristic curve between the second internal resistance and the second current. Wherein the first characteristic curve and the second characteristic curve match each other.

Wherein the area covered by the first characteristic curve includes a first non-complete conduction region and a first conduction region, and the first internal resistance increases with the first current from zero to the first non-complete conduction region. region exhibits exponential decay, while it exhibits linearity in the first conduction region. The area covered by the second characteristic curve includes a second incomplete conduction region and a second conduction region, and the second internal resistance is in the second incomplete conduction region when the second current increases from zero to upward Shows exponential decay, and shows linearity in the second conduction region.

Wherein the first LED array and the second LED array are respectively arrays formed by a plurality of red LEDs, and the first internal resistance is substantially equal to the internal resistance of the second LED array.

The impedance providing element is a semiconductor element or a thermistor with a positive temperature coefficient.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

The accompanying drawings, which follow and constitute a part of the specification of the invention, illustrate example embodiments of the invention and together with the description explain the principles of the invention.

FIG. 1A is a schematic diagram of a light emitting diode device according to an embodiment of the invention.

FIG. 1B is a graph showing the relationship between internal resistance and current according to an embodiment of the present invention.

FIG. 2A is a schematic diagram of a light emitting diode device according to an embodiment of the invention.

FIG. 2B is a relationship diagram of internal resistance versus current according to an embodiment of the invention.

FIG. 2C is a relationship diagram of internal resistance versus current according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of a light emitting diode device according to another embodiment of the present invention.

FIG. 4A is a schematic diagram of a light emitting diode device according to an embodiment of the invention.

FIG. 4B is a schematic diagram of a light emitting diode device according to an embodiment of the invention.

Description of main component symbols:

100, 200, 300, 400A, 400B: LED devices

110, 350: LED array

110A, 120A, 150_1～150_4: characteristic curve

120, 422: Impedance providing components

130A, 230A: non-complete conduction area

130B, 230B: conduction area

140: LED array

150: Tuning Module

351～355: LED

410: The first adjustment module

412: First LED

420: Second adjustment module

424: Electronic components

430: The third adjustment module

432: Second LED

ID, ID1, ID2, ID3: drive current

RD, RD1, RD2: internal resistance

detailed description

Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements/members using the same reference numerals in the drawings and embodiments represent the same or similar parts.

FIG. 1A is a schematic diagram of a light emitting diode device according to an embodiment of the invention. See Figure 1A. The LED device 100 includes a LED array 110 and an impedance providing element 120 . The LED array 110 includes a plurality of LEDs. The impedance providing element 120 and the LED array 110 are electrically connected in parallel with each other. The impedance providing element 120 will adjust the provided internal resistance RD according to the ambient temperature, and the impedance providing element 120 can be a semiconductor element or a thermistor with a positive temperature coefficient, such as a semiconductor element or a thermistor with a positive temperature coefficient (PositiveTemperatureCoefficient, PTC). The resistor is used to compensate the light-emitting brightness of the light-emitting diode due to temperature changes. That is to say, when driving the current ID, the driving current ID will be divided into two driving currents ID1 and ID2 according to Kirchhoff's circuit laws. The driving current ID1 is shunted to the LEDs of the LED array 110 , and the driving current ID2 is flowed to the impedance providing element 120 . Moreover, the current value of the driving current ID is exactly equal to the sum of the current values of the driving currents ID1 and ID2 . Wherein, the voltage across the two ends of the LED array 110 and the voltage across the impedance providing element 120 are the same.

Here, the current values of the driving currents ID1 and ID2 are determined by the ratio of the internal resistance RD provided by the impedance providing element 120 to the internal resistance RD1 of the LED array 110 . Please note that in this embodiment, the internal resistance RD provided by the impedance providing element 120 is proportional to the ambient temperature. In this embodiment, when the impedance providing element 120 is, for example, a positive temperature coefficient semiconductor element or a thermistor, its internal resistance RD is inversely proportional to the ambient temperature. That is, as the ambient temperature increases, the internal resistance RD of the impedance providing element 120 decreases. When the ambient temperature decreases, the internal resistance RD of the impedance providing element 120 increases.

In short, when the internal resistance RD provided by the impedance providing element 120 is greater than the internal resistance RD1 of the LED array 110 , the current value of the driving current ID1 is greater than the current value of the driving current ID2 . On the contrary, if the internal resistance RD provided by the impedance providing element 120 is smaller than the internal resistance RD1 of the LED array 110 , the current value of the driving current ID1 will be smaller than the current value of the driving current ID2 . Certainly, when the internal resistance RD provided by the impedance providing element 120 is equal to the internal resistance RD1 of the LED array 110 , the driving current ID is evenly distributed to the driving currents ID1 and ID2 .

It can be clearly known from the above description that when the light emitting diode device 100 is operated for a long time, the impedance providing element 120 increases the internal resistance RD provided by it corresponding to the ambient temperature increasing with time. As the internal resistance RD increases, the driving current ID1 shunted to the LED array 110 will also increase accordingly. The driving current ID1 that rises with the ambient temperature can effectively compensate the luminance of the LED array 110 that should have decreased due to the ambient temperature rise (before compensation), thereby compensating for the light decay characteristic of the LEDs.

FIG. 1B is a graph showing the relationship between internal resistance and current according to an embodiment of the present invention. Please refer to Figure 1A and Figure 1B together. When the light-emitting diode array 110 is implemented with a plurality of red light-emitting diodes, its equivalent internal resistance RD1 is actually measured as a characteristic curve 110A, and the internal resistance RD of the impedance providing element 120 is actually measured as a characteristic curve 120A, Moreover, the characteristic curve 120A presents a straight line in the range of current 0-46mA, and an upward curved curve in the range of more than 46mA. The characteristic curve 120A indicates that the internal resistance RD of the impedance providing element 120 maintains a relatively small fixed value in the low current segment, but maintains a relatively large rising value in the high current segment.

In the illustration of FIG. 1B , the characteristic curve 110A is measured from the change in the resistance value of three strings of red light emitting diodes connected in parallel, and the area covered by the characteristic curve 110A includes the non-complete conduction region 130A and The conduction region 130B, wherein the non-complete conduction region 130A is in the region of current 0-23mA, and the conduction region 130B is in the region of current 23-80mA or above 23mA. In the non-complete conduction region 130A, the internal resistance RD1 of the light emitting diode array 110 presents an exponentially increasing change as the current decreases, getting closer to the internal resistance RD2 of the impedance providing element 120, and even exceeding the internal resistance of the impedance providing element 120. There are many resistors RD2 , resulting in the problem of mismatched resistance values; while in the conduction region 130B, the internal resistance RD1 is linear with the increase of current, approximately maintaining a constant value, but smaller than the internal resistance RD2 of the impedance providing element 120 . On the other hand, the internal resistance of the characteristic curve 120A exhibits a linear relationship with respect to the current range of 0-46 mA, and approximately maintains a small fixed value. Since the internal resistance RD1 of the light-emitting diode array 110 has different resistance values under different current conditions, this will cause a mismatch between the resistance values of the light-emitting diode array 110 and the impedance providing element 120. In the case of , most of the current is shunted to the impedance providing element 120 , but the remaining small portion of the current is shunted to the LED array 110 . Therefore, the light-emitting diode array 110 cannot exert substantial luminous efficiency in the current range of 15mA to 80mA, or even 200mA, resulting in a color temperature shift of about 2000K, where K is the Kelvins temperature scale. Please note that the LED array 110 of the present invention is not limited to be implemented with red LEDs, and the current value on the direct axis and the ohm value on the horizontal axis corresponding to the characteristic curve are not limited to the values listed in this example. Everything depends on the actual design requirements.

FIG. 2A is a schematic diagram of a light emitting diode device according to an embodiment of the invention. FIG. 2B is a relationship diagram of internal resistance versus current according to an embodiment of the invention. Please refer to Figure 2A and Figure 2B together. In order to further improve the problem of color temperature shift, the LED device 200 includes a LED array 110 and an adjustment module 150 , wherein the adjustment module 150 includes an impedance providing element 120 and a diode array 140 connected in series. The adjustment module 150 is used to be electrically connected in parallel with the LED array 110 . In this embodiment, the adjustment module 150 can provide the role of the resistance change, and actually does not contribute to the brightness. In another embodiment, the adjustment module 150 can not only provide the role of resistance variation, but also contribute brightness.

The light emitting diode array 110 includes a plurality of first light emitting diodes having an internal resistance RD1, and the internal resistance RD1 has a characteristic curve 110A after actual measurement.

The diode array 140 can be formed of diodes, zener diodes, or light emitting diodes, so as to have similar or identical changes in the resistance and current change characteristics of the light emitting diode array 110 . In this embodiment, the internal resistance of the diode array 140 is approximately equal to the internal resistance RD1 of the LED array 110 . The adjustment module 150 has an equivalent internal resistance RD2. The internal resistance RD2 has a change similar to or equal to the characteristic curves 150_1 - 150_4 through actual measurement, and the impedance providing element 120 is, for example, a PTC. Among them, the characteristic curve 150_1 is measured from the resistance change of a red light emitting diode connected in series with a PTC (15 ohms), and the characteristic curve 150_2 is measured from the resistance value change of a red light emitting diode connected in series with a PTC (150 ohms). Curve 150_3 is measured from the resistance change of PTC (300 ohm) connected in series with red LED, and characteristic curve 150_4 is measured from the resistance change of PTC (450 ohm) connected in series with red LED. In the small current section, the resistance of the characteristic curves 150_4 , 150_3 , 150_2 , 150_1 , compared with the characteristic curve 110A, exhibits a consistent trend of exponential increase as the current decreases. In the high current section, the characteristic curves 150_4 , 150_3 , 150_2 , and 150_1 exhibit a linear relationship, each of which maintains approximately a constant value. In terms of the numerical relationship of these characteristic curves, the characteristic curves 150_4 , 150_3 , 150_2 , and 150_1 decrease in sequence. The characteristic curves 150_4 , 150_3 , 150_2 have obvious intervals (gap) with respect to the characteristic curve 110A, and the relationship curves between the internal resistance and the current of the characteristic curve 110A and the characteristic curve 150_1 overlap. The areas covered by the characteristic curves 150_4, 150_3, 150_2, 150_1, and 110A include the incomplete conduction region 230A and the conduction region 230B, wherein the incomplete conduction region 230A is between the current 0-23mA region, and the conduction region 230B is between In the area where the current is 23-80mA or above 23mA.

FIG. 2C is a relationship diagram of internal resistance versus current according to another embodiment of the present invention. See Figure 2C. Considering that the characteristic curves 150_4 , 150_3 , 150_2 of FIG. 2B have distances (differences) relative to the characteristic curve 110A. Ideally, at room temperature (25 degrees Celsius), the internal resistance of the PTC approaches zero. In this embodiment, at normal temperature (25 degrees Celsius), the design of the impedance providing element 120 can be selected according to the actual situation, so as to reduce the interval between the two characteristic curves. For example, the impedance providing element 120 at normal temperature is 15 Ohms, it has been proved by experiments that the characteristic curves 110A and 150_1 will overlap and be consistent, that is, the change characteristics of resistance and current are overlapping and consistent, so that it can be applied in the non-complete conduction region and the conduction region can match each other, That is to say, the internal resistance RD2 can be changed in a similar proportion to the internal resistance RD1. Although the present embodiment is described with 15 ohms as the minimum internal resistance of the PTC, the present embodiment is not limited thereto.

Furthermore, the driving current ID is divided into two driving currents ID1 and ID3. The driving currents ID1 and ID3 respectively flow to the LED array 110 and the adjustment module 150 . Since the resistance values of the two characteristic curves exhibit exponential decay as the current increases, or maintain a similar ratio in the linear part, the internal resistance RD2 and internal resistance RD1 make the internal resistance RD2 and internal resistance RD1 from small current (close to zero current) to large current ( The driving current for normal operation) can always maintain a similar ratio, so the driving current ID3 also has a stabilizing effect proportional to the driving current ID1. In this way, even if the driving currents ID1 and ID3 are in the non-complete conduction region, the internal resistances RD1 and RD2 can still change in a similar ratio, so the driving current ID3 will not be much greater than the driving current ID1, so this embodiment can be used for Ensuring that the ratio of the current passing through the LED array 110 and the adjustment module 150 is constant, ensures that the LED array 110 substantially exerts brightness, thereby reducing the range of color temperature shift.

Therefore, the light emitting diode device 200 can not only dynamically adjust light to reduce the range of color temperature shift, but also can perform brightness compensation at high temperature, so as to avoid the problem of high temperature heat fading. On the other hand, if the characteristic curve 110A and the characteristic curve 150_1 of the element are very similar and overlap, the range of the color temperature shift can be further minimized.

Based on the above, taking the circuit structure of FIG. 1A as an example, although it can compensate for the light decay characteristics of LEDs, the LED array 110 will have a color temperature shift of 2000K in the range of current 15mA to 200mA; and the circuit structure of FIG. 2A is For example, when the characteristic curves 110A and 150A overlap, the color temperature shift of 2000K can be converged to 200K, or even smaller. Therefore, the light-emitting diode device 200 of this embodiment can effectively solve the traditional problem of brightness and color temperature shifts caused by temperature changes or driving current modulation when driving light-emitting diodes.

FIG. 3 is a schematic diagram of a light emitting diode device according to another embodiment of the present invention. See Figure 3. In this embodiment, compared with the illustration in FIG. 2A , the LED device 300 may further include a LED array 350 . The LED array 350 is connected in series with the LED array 110 and the adjustment module 150 respectively, and receives the driving current ID to emit light. The LED array 110 may include a plurality of red LEDs, and the LED array 350 may include a plurality of non-red LEDs 351-355, and the LEDs 351-355 are sequentially connected in series. Wherein, the current input end of the LED 351 is electrically connected to the current output end of the red LED, and the current input end of the LED 351 is electrically connected to the current output end of the impedance providing element 120 respectively. After adding settings such as the LED array 350, the color of the light emitted by the LED device 300 can be changed. The LEDs of the LED array 350 can be connected in parallel, in series or a combination of series and parallel.

Of course, the number of non-red LEDs included in the LED array 350 is not limited to five, and can be designed according to actual conditions. The LED array 350 can also be implemented by changing at least one non-red LED. In addition, the light attenuation characteristics of red light emitting diodes are more severe and greater than those of non-red light emitting diodes.

In this embodiment, the red light-emitting diode can excite the first light with the first wavelength, and the non-red light-emitting diode can excite the second light with the second wavelength, and the first wavelength is different from the second wavelength . For example, the non-red light-emitting diodes included in the light-emitting diode array 350 can be blue light-emitting diodes, or light-emitting diodes that can emit light of other colors, such as green light-emitting diodes, yellow light-emitting diodes, orange light-emitting diodes, ultraviolet light-emitting diodes, etc. Light-emitting diodes, near-blue light-emitting diodes, or white light-emitting diodes.

Based on the content disclosed in the above embodiments, a general light emitting diode device can be compiled. More clearly, FIG. 4A is a schematic diagram of a light emitting diode device according to an embodiment of the present invention. Please refer to FIG. 4A , the LED device 400A includes a first adjustment module 410 and a second adjustment module 420 . The first adjustment module 410 includes at least one first light emitting diode 412 , the second adjustment module 420 includes an impedance providing element 422 and an electronic element 424 connected in series, and the second adjustment module 410 and the first adjustment module 420 are electrically connected in parallel. The impedance providing element 422 can be a semiconductor element with a positive temperature coefficient or a thermistor, and the electronic element 424 can be a diode, a zener diode, a light emitting diode, a diode array, a zener diode array or a light emitting diode array, but not limited to the listed ones. The type of the device is sufficient as long as it can produce a characteristic curve having a similar or the same change as the device characteristic of the first light emitting diode 412 . The characteristic curves are described in more detail below.

In operation principle, the first adjustment module 410 has a first internal resistance, and the second adjustment module 420 has a second internal resistance. The first internal resistance has a first characteristic curve (the characteristic curve 110A shown in FIG. 2B or FIG. 2C ), and the area covered by the first characteristic curve includes the first non-complete conduction region (the characteristic curve 110A shown in FIG. 2B ). ) and the first conduction region (230B as shown in FIG. 2B ), and the first internal resistance exhibits exponential decay in the first non-complete conduction region as the current increases from zero, while in the first conduction region The pass region is linear. The second internal resistance has a second characteristic curve (the characteristic curve 150A shown in FIG. 2B or FIG. 2C ), and the area covered by the second characteristic curve includes the second non-complete conduction region (as shown in FIG. 2B 230A) and the second conduction region (230B as shown in FIG. 2B ), and the second internal resistance exhibits an exponential decay in the second non-complete conduction region as the current increases from zero, and in the second The conduction region is linear. Wherein the first characteristic curve and the second characteristic curve can match each other in the incomplete conduction region and the conduction region.

The driving current ID is divided into two driving currents ID1 and ID3, and the current value of the driving current ID is exactly equal to the sum of the current values of the driving currents ID1 and ID3. Since the first characteristic curve and the second characteristic curve match each other, when the driving current ID changes, the driving current ID3 will also change in proportion to the driving current ID1, so this embodiment can further reduce the range of the color temperature shift.

FIG. 4B is a schematic diagram of a light emitting diode device according to an embodiment of the invention. Please refer to FIG. 4B . In this embodiment, compared with the illustration in FIG. 4A , the LED device 400B may further include a third adjustment module 430 . The third adjusting module 430 includes at least one second light emitting diode 432 . The first light emitting diode 412 can excite a first light with a first wavelength, and the second light emitting diode 432 can excite a second light with a second wavelength, and the first wavelength is different from the second wavelength. The third adjustment module 430 is connected in series with the first adjustment module 410 and the second adjustment module 420 respectively, and receives the driving current ID to emit light. After adding settings such as the third adjustment module 430, the color of the light emitted by the LED device 400B can be changed. For example, the first LED 412 and the second LED 432 may be red LEDs and blue LEDs respectively, but the present invention is not limited thereto.

The meanings of the resistance, internal resistance, resistance value and impedance described in the above embodiments are the same, and the unit is ohm.

The ambient temperature in the above embodiments may be the ambient temperature of the LED device, LED array, LED, LED chip, adjustment module, diode array or impedance providing element.

In the LED array described in the above embodiments, the LEDs can be connected in parallel, in series or in series and parallel. In addition, the LEDs of the LED array 110 may be LED chips, LED packages, or any combination thereof.

The light-emitting diodes described in the above embodiments can be red light, green light, blue light, white light or any combination of the above light-emitting diodes, and the white light-emitting diodes can include blue light-emitting diode chips and yellow phosphor powder, and can also include red light-emitting diodes chip or red phosphor. In addition, the above-mentioned white light-emitting diodes may include red, green and blue light-emitting diode chips, may also include yellow phosphor powder, and may further include red phosphor powder. In addition, the above-mentioned fluorescent powder is distributed in the light-transmitting colloid of the above-mentioned light-emitting diode in a manner of uniformity, non-uniformity or concentration gradient.

To sum up, the structure of the light emitting diode device of the present invention adopts the electrical parallel connection of the first adjustment module and the second adjustment module, the first adjustment module has at least one light emitting diode, and the second adjustment module includes impedance providing elements connected in series and electronic components. The first characteristic curve of the first adjustment module is matched with the second characteristic curve of the second adjustment module, so that the light emitting diode device can be dynamically adjusted to reduce the range of color temperature deviation, and the luminous brightness compensation can be performed at high temperature, So as to avoid the problem of high temperature heat decay. On the other hand, the LED device of the present invention can also be applied to indoor lighting devices, outdoor lighting devices, backlight devices or indicating devices.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (9)

1. a light-emitting diode assembly, comprising:

One first adjusting module, comprise at least one first light-emitting diode with one first internal resistance, in order to receive one first electric current, and there is between this first internal resistance and this first electric current one first characteristic curve, the region that this first characteristic curve is contained comprises one first non-fully conducting district and one first conducting district, and this first internal resistance presents exponential damping along with when this first electric current is up increased by null value in this first non-fully conducting district, and present linearly in this first conducting district; And

One second adjusting module, the impedance comprising series connection provides element and an electronic component, and this second adjusting module is electrically in parallel with this first adjusting module, in order to receive one second electric current, and this second adjusting module has one second internal resistance, and there is between this second internal resistance and this second electric current one second characteristic curve, the region that this second characteristic curve is contained comprises one second non-fully conducting district and one second conducting district, and this second internal resistance presents exponential damping along with when this second electric current is up increased by null value in this second non-fully conducting district, and present linearly in this second conducting district,

Wherein this first characteristic curve mates mutually with this second characteristic curve, and this electronic component is Zener diode or zener diode array.

2. light-emitting diode assembly as claimed in claim 1, is characterized in that, this impedance provides element to be semiconductor element or the thermistor of positive temperature coefficient.

3. light-emitting diode assembly as claimed in claim 1, also comprises:

One the 3rd adjusting module, comprises at least one second light-emitting diode, and the 3rd adjusting module is connected with this first adjusting module, this second adjusting module respectively.

4. light-emitting diode assembly as claimed in claim 3, it is characterized in that, this first light-emitting diode can inspire the first light that one has a first wave length, and this second light-emitting diode can inspire the second light that one has a second wave length, and this first wave length and this second wave length different.

5. light-emitting diode assembly as claimed in claim 4, it is characterized in that, this first light-emitting diode and this second light-emitting diode are respectively red light-emitting diode and blue light-emitting diode.

6. a light-emitting diode assembly, comprising:

One first light emitting diode matrix, comprises one first internal resistance, in order to receive one first electric current, and has one first characteristic curve between this first internal resistance and this first electric current; And

Zener diode array and an impedance of series connection provide element, electrically in parallel with this first light emitting diode matrix, in order to receive one second electric current, and this zener diode array of series connection and this impedance provide element to have one second internal resistance, and there is between this second internal resistance and this second electric current one second characteristic curve;

Wherein this first characteristic curve mates mutually with this second characteristic curve.

7. light-emitting diode assembly as claimed in claim 6, it is characterized in that, the region that this first characteristic curve is contained comprises one first non-fully conducting district and one first conducting district, and this first internal resistance presents exponential damping along with when this first electric current is up increased by null value in this first non-fully conducting district, and present linearly in this first conducting district: and

The region that this second characteristic curve is contained comprises one second non-fully conducting district and one second conducting district, and this second internal resistance presents exponential damping along with when this second electric current is up increased by null value in this second non-fully conducting district, and present linearly in this second conducting district.

8. light-emitting diode assembly as claimed in claim 6, it is characterized in that, this first light emitting diode matrix and this zener diode array are respectively the array that multiple red light-emitting diode and Zener diode are formed, and this first internal resistance is equal with the internal resistance of this zener diode array.

9. light-emitting diode assembly as claimed in claim 6, is characterized in that, this impedance provides element to be semiconductor element or the thermistor of positive temperature coefficient.