TWI404453B - Method for increasing brightness of light emitting diode and light emitting diode module - Google Patents

Abstract

A method for increasing brightness of a light emitting diode is suitable to increase brightness of a light emitting diode (LED) from a first brightness to a second brightness. The LED controlled by the first modulation signal has a first brightness. The pulse height, the duty cycle and the frequency of the first modulation signal are H1, D1 and f1 respectively. The method for increasing brightness of a light emitting diode includes controlling the LED by the second modulation signal such that the second brightness is represented by the LED. The pulse height, the duty cycle and the frequency of the second modulation signal are H2, D2 and f2 respectively, and H1, D1, f1, H2, D2, f2 satisfy following conditions: H1.D1=H2.D2, H2 > H1, D2 < D1 and f2 > f1.

Description

Method for improving brightness of light-emitting diode and light-emitting diode module

The invention relates to a light-emitting diode module and a method for improving the brightness of the light-emitting diode, and particularly relates to a light-emitting diode module and a lifting device capable of exhibiting high brightness of the light-emitting diode. A method of illuminating the brightness of a diode.

With the advancement of semiconductor technology, today's light-emitting diodes can emit high-intensity light, and the light-emitting diode has the advantages of power saving, small size, low voltage driving, and no mercury, so the light-emitting diode has Widely used in the field of lighting, and a luminaire with a light-emitting diode as a light source has also been introduced.

Conventional techniques control the brightness exhibited by the light-emitting diode by controlling the current through the light-emitting diode. In detail, the greater the current through the light-emitting diode, the greater the brightness exhibited by the light-emitting diode, but the greater the thermal energy generated by the light-emitting diode. However, the accumulation of thermal energy in the light-emitting diode and failure to discharge in time will cause the temperature of the light-emitting diode to rise and overheating, so as to reduce the life of the light-emitting diode and even cause the light-emitting diode to burn out.

In order to avoid the above-mentioned overheating situation, the current light-emitting diode modules are equipped with a heat sink to control the temperature of the light-emitting diode to avoid overheating of the light-emitting diode. Moreover, when the brightness of the light-emitting diode needs to be increased, the heat energy generated by the light-emitting diode is also increased, and in order to discharge the heat energy of the light-emitting diode in time, it is necessary to improve the heat dissipation effect of the heat sink. rate. The conventional technique is to increase the heat dissipation area of the heat sink to improve the heat dissipation efficiency. However, increasing the heat dissipation area of the heat sink will increase the manufacturing cost of the light emitting diode module and the total volume of the light emitting diode module, and reduce the light emission. The design flexibility of the diode module.

The invention provides a method for improving the brightness of a light-emitting diode, which can improve the brightness of the light-emitting diode without increasing the heat energy generated by the light-emitting diode.

The invention further provides a light-emitting diode module, wherein the light-emitting diode can exhibit high brightness.

In order to specifically describe the content of the present invention, a method for improving the brightness of a light-emitting diode is proposed, which is suitable for increasing the brightness of a light-emitting diode from a first brightness to a second brightness, wherein the light-emitting diode is The first brightness is controlled by a first modulation signal, and the pulse height, duty cycle, and frequency of the first modulation signal are H1, D1, and f1, respectively. The method for improving the brightness of the LED includes controlling the LED through a second modulation signal to cause the LED to exhibit a second brightness, wherein the pulse height, duty cycle, and frequency of the second modulation signal are respectively H2, D2, f2, and H1, D1, f1, H2, D2, and f2 satisfy the following conditions: H1. D1=H2. D2; H2>H1; D2<D1 and f2>f1.

In an embodiment of the invention, the method for controlling the LED through the second modulation signal comprises: providing the second modulation signal to a current control device, wherein the current control device controls the illumination through the second modulation signal according to the second modulation signal The current of the polar body.

In an embodiment of the invention, D2≦1.

In an embodiment of the invention, f2>f1 60 Hz.

In an embodiment of the invention, the method for improving the brightness of the LED includes: detecting an operating temperature of the LED through a temperature sensor, and adjusting according to a comparison between the operating temperature and a reference temperature. The duty cycle and frequency of the second modulation signal are such that the operating temperature of the light emitting diode approaches the reference temperature.

In an embodiment of the invention, the second modulation signal is obtained by modulating the first modulation signal.

To specifically describe the content of the present invention, a light emitting diode module includes a light emitting diode, a current control device, a peak modulation unit, and a pulse width modulation unit. When the LED is controlled by a first modulation signal, the LED exhibits a first brightness, and the pulse height, duty cycle, and frequency of the first modulation signal are H1, D1, and F1, respectively. The current control device is coupled to the light emitting diode. The peak modulation unit is coupled to the current control device. The pulse width modulation unit is coupled to the peak modulation unit, and the pulse width modulation unit and the peak modulation unit are adapted to generate a second modulation signal to the current control device, wherein the current control device is adapted to be controlled according to the second modulation signal Passing the current of the LED, so that the LED exhibits a second brightness greater than the first brightness, and the pulse height, duty cycle, and frequency of the second modulation signal are H2, D2, and F2, respectively, and H1, D1 , f1, H2, D2, and f2 satisfy the following conditions: H1. D1=H2. D2; H2>H1; D2<D1 and F2>f1.

In an embodiment of the invention, the LED module further includes a temperature controller including a temperature sensor and a comparison unit. The temperature sensor is adapted to sense an operating temperature of the light emitting diode. Comparison unit and temperature The sensor is coupled to and is adapted to generate a feedback signal to the pulse width modulation unit according to a comparison result between the operating temperature and a reference temperature to adjust a duty cycle and a frequency of the second modulation signal to enable the light emitting diode The operating temperature approaches the reference temperature.

In an embodiment of the invention, the second modulation signal is obtained by adjusting the first modulation signal via the pulse width modulation unit and the peak modulation unit.

In an embodiment of the invention, D2≦1.

In an embodiment of the invention, f2>f1 60Hz.

In one embodiment of the invention, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a single wafer.

In an embodiment of the invention, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a circuit board.

In an embodiment of the invention, the current control device is a transistor component, and the transistor component can be a Complementary Metal-Oxide Semiconductor (CMOS) or a Bipolar Junction Transistor. A gate (GATE) or base (BASE) of the transistor component is coupled to the peak modulation unit, and a drain (DRAIN) or collector (COLLECTOR) of the transistor component is coupled to the light emitting diode.

In an embodiment of the invention, the LED module further includes an electrostatic protection device coupled to the drain (DRAIN) or the collector (COLLECTOR), and the electrostatic protection device is connected in parallel with the LED.

In an embodiment of the invention, the LED module further includes a power supply device and a voltage modulation device, wherein the voltage modulation device and the power source The power supply device is adapted to provide a system voltage to voltage modulation device, and the voltage modulation device is adapted to adjust the system voltage to a driving voltage for input to the light emitting diode.

In one embodiment of the invention, the voltage modulation device, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a single wafer.

In an embodiment of the invention, the voltage modulation device, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a circuit board.

In summary, the present invention improves the brightness of the light-emitting diode by increasing the pulse height of the modulated signal, and maintains the current through the light-emitting diode and the light-emitting diode by reducing the duty cycle. The heat generated is unchanged. Moreover, in order to keep the pulse pitch of the modulated signal of the present invention constant, the present invention increases the frequency of the modulated signal.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1 is a schematic view of a light emitting diode module according to an embodiment of the present invention, and FIG. 2A is a cross-sectional view of the light emitting diode module of FIG. 2B, 2C, 2D, and 2E are cross-sectional views showing various changes in the structure of the light-emitting diode module according to an embodiment of the present invention.

Referring to FIG. 1 , the LED module 100 of the present embodiment includes a light emitting diode 110 , a current control device 120 , a peak modulation unit 130 , and a pulse width modulation unit 140 . When the light emitting diode 110 is controlled by a first modulation signal, the light emitting diode 110 exhibits a first brightness, and the first The pulse height, duty cycle, and frequency of a modulated signal are H1, D1, and f1, respectively.

In addition, in the embodiment, in order to drive the LEDs 110, a power supply device 150 and a voltage modulation device 160 may be disposed in the LED module 100. The voltage modulation device 160 is coupled to the power supply device 150 and the light emitting diode 110. The power supply device 150 is adapted to provide a system voltage to voltage modulation device 160, and the voltage modulation device 160 is adapted to adjust the system voltage to a drive. The voltage is input to the light emitting diode 110 and generates a current through the light emitting diode 110.

The current control device 120 is coupled to the light emitting diode 110. In this embodiment, the current control device 120 is, for example, a transistor component, and a gate 122 (or base) of the transistor component is coupled to the peak modulation unit 130, and a drain 124 of the transistor component (or set) The LED is coupled to the LED diode 110. In this embodiment, the transistor element can be a complementary MOS or a bi-carrier bonded transistor. In addition, in the embodiment, an electrostatic protection device 170 connected in parallel with the LED 201 can be disposed, and the electrostatic protection device 170 is coupled to the drain 124.

The peak modulation unit 130 is coupled to the current control device 120 , and the pulse width modulation unit 140 is coupled to the peak modulation unit 130 . The pulse width modulation unit 140 and the peak modulation unit 130 are adapted to generate a second modulation signal to the current control device 120. The current control device 120 is adapted to control the current through the light emitting diode 110 according to the second modulation signal, so that the light emitting diode 110 exhibits a second brightness greater than the first brightness, and the pulse height of the second modulation signal works. The period and frequency are H2, D2, and f2, respectively, and H1, D1, f1, and H2. D2 and f2 satisfy the following conditions: H1. D1=H2. D2.........(Form 1); H2>H1; D2<D1 and f2>f1.

In this embodiment, D2 is, for example, less than or equal to 1, and f2>f1 60Hz.

In detail, since the brightness of the LEDs 110 is positively correlated with the pulse height of the modulation signal, in this embodiment, the pulse height of the second modulation signal is greater than the pulse height of the first modulation signal, so that the light is emitted. The polar body 110 exhibits a second brightness greater than the first brightness. However, the product of the pulse height of the modulation signal and the duty cycle is proportional to the magnitude of the current through the LED 201. Therefore, the current through the LED 201 controlled by the current control device 120 according to the first modulation signal is equal to the current through the LED 201 controlled by the current control device 120 according to the second modulation signal. The pulse height and duty cycle of the first and second modulation signals are in accordance with equation (1). It can be known from the formula (1) that when the pulse height of the second modulation signal is greater than the pulse height of the first modulation signal, the duty cycle of the second modulation signal needs to be smaller than the duty cycle of the first modulation signal.

As described above, the LED module 100 of the present embodiment can improve the brightness of the LEDs 110 while maintaining the current through the LEDs 110. In other words, the embodiment can In the case where the thermal energy generated by the light-emitting diode 110 does not change, the brightness exhibited by the light-emitting diode 110 is increased. Further, it is worth noting that in the present embodiment, "current" represents the average current.

In addition, in this embodiment, the second modulation signal may be adjusted by the first modulation signal via the pulse width modulation unit 140 and the peak modulation unit 130. Arrived. Specifically, the pulse width modulation unit 140 can adjust the duty cycle and frequency of the first modulation signal to the duty cycle and frequency of the second modulation signal, and the peak modulation unit 130 can set the pulse height of the first modulation signal. Adjust to the pulse height of the second modulation signal.

In this embodiment, in order to sense an operating temperature of the LED 201 and bring the operating temperature of the LED 110 closer to the reference temperature, a temperature control may be disposed in the LED module 100. The device 180 includes a temperature sensor 182 and a comparison unit 184. The temperature sensor 182 is coupled to the comparison unit 184, and the temperature sensor 182 is adapted to sense an operating temperature of the LED 201. The comparing unit 184 is adapted to generate a feedback signal to the pulse width modulation unit 140 according to the comparison result of the operating temperature and a reference temperature to adjust the duty cycle and frequency of the second modulation signal to operate the LED 110. The temperature approaches the reference temperature.

Referring to FIG. 1 and FIG. 2A, the temperature control device 180, the pulse width modulation unit 140, the peak modulation unit 130, and the electrostatic protection device 170 may be integrated into a single chip or integrated into a circuit board S. Alternatively, the voltage modulation device 160, the temperature control device 180, the pulse width modulation unit 140, the peak modulation unit 130, and the electrostatic protection device 170 are integrated into a single chip or integrated into a circuit board S.

When the light emitting diode 110 is a light emitting diode chip, the light emitting diode 110 can be assembled with the circuit board S in a flip chip manner. That is to say, the light-emitting diode 110 can electrically connect the circuit board S through a plurality of bumps B, wherein the bump B is, for example, a solder ball or a gold ball. As such, the LED module 100 has a short heat transfer path that facilitates the discharge of thermal energy.

1 and 2B, when the temperature control device 180, the pulse width modulation unit 140, the peak modulation unit 130, and the electrostatic protection device 170 are integrated into a control wafer C, which can be disposed on a circuit board 200, and The wiring board 200 is connected by wire bonding or flip chip bonding (as shown in FIG. 2C). In addition, the light emitting diode 110 can be disposed on the control wafer C to form a wafer stack structure S, and the wafer stack structure S can be connected to the circuit board 200 by wire bonding (as shown in FIG. 2D). , COB). In addition, referring to FIG. 2E , when a package body 310 covers the wafer stack structure S1 to form a chip package A, the chip package A can be locked to the circuit board 200 through the screw 320 or locked to the heat sink. 190 (not shown). In addition, in other embodiments, the temperature control device 180, the pulse width modulation unit 140 and the peak modulation unit 130, and the electrostatic protection device 170 may also be partially integrated in the control chip C, and the other portion is integrated in the circuit board 200. .

In addition, the LED module 100 further includes a heat sink 190 that is thermally coupled to the circuit board 200. It is to be noted that, compared with the prior art, the LED module 100 of the present embodiment can improve the appearance of the LEDs 110 when the thermal energy generated by the LEDs 110 is constant. Brightness, therefore, the heat sink 190 of the present embodiment does not need to increase the heat dissipation area. In this way, the LED module 100 of the present embodiment can enhance the brightness of the LEDs 110 while maintaining the heat dissipation area of the heat sink 190.

In addition, the heat sink 190 can be connected to the circuit board 200 through a silver epoxy or other heat sink. In addition, when the light emitting diode 110 is In the case of the light emitting diode package, the light emitting diode 110 and the circuit board 200 can be locked to the heat sink 190 by screws. In this way, the heat dissipation area of the LED module 100 can be increased to quickly discharge the thermal energy generated by the LEDs 110, thereby effectively controlling the temperature of the LEDs 110.

In addition, when the brightness has reached the required level, the heat generated by the light-emitting diode 110 can be easily discharged through the medium, so that the light-emitting diode 110 operates at a safe temperature, and the light-emitting diode 110 can be used. The wire bonding ( ) method is integrated with other components in FIG. 2A, 2B, 2C, 2D and 2E (chip on board, COB).

Hereinafter, an embodiment of the method for improving the brightness of the light-emitting diode of the present invention will be described to explain the details of the operation. Further, since the method of improving the brightness of the light-emitting diode of the present embodiment can be applied to the light-emitting diode module 100 of FIG. 1, please refer to FIG. 1 together.

3 is a schematic diagram of a first modulation signal and a second modulation signal according to an embodiment of the invention. 4 is a graph showing the relationship between the voltage outputted by the temperature sensor and the time when the LED module of FIG. 1 is operated. FIG. 5 is a schematic diagram of a second modulation signal according to an embodiment of the invention.

Referring to FIG. 1 and FIG. 3 simultaneously, the method for improving the brightness of the LED is adapted to increase the brightness of a LED from a first brightness to a second brightness. The LEDs 110 are controlled by a first modulation signal P1 to exhibit a first brightness. The pulse height, duty cycle, and frequency of the first modulation signal P1 are H1, D1, and F1, respectively. In detail, the pulse width, the pulse pitch, and the period of the first modulation signal P1 are respectively W1, G1, and T1, and W1, G1, D1, f1, and T1 satisfy the following conditions: ;as well as The method for improving the brightness of the light-emitting diode is to control the light-emitting diode through a second modulation signal P2, so that the light-emitting diode 110 exhibits a second brightness, wherein the pulse height and duty cycle of the second modulation signal P2. The frequencies are H1, D1, and f1. In detail, the pulse width, the pulse pitch, and the period of the second modulation signal P2 are respectively W2, G2, and T2, and W2, G2, D2, f2, and T2 satisfy the following conditions: ;as well as Moreover, H1, D1, f1, H2, D2, and f2 must satisfy the following conditions: H1. D1=H2. D2...(1); H2>H1;D2<D1 and f2>f1, where D2 is, for example, less than or equal to 1, and f2>f1 60 Hz. In addition, in the embodiment, the method for controlling the LED through the second modulation signal P2 may be to provide the second modulation signal P2 to the current control device 120, and the current control device 120 may be based on the second modulation signal. P2 controls the current through the light emitting diode 110.

In addition, in the embodiment, the method for improving the brightness of the LED may be to detect an operating temperature of the LED through a temperature sensor 182, and adjust according to a comparison between the operating temperature and a reference temperature. First The duty cycle and frequency of the second modulation signal P2 are such that the operating temperature of the light emitting diode 110 approaches the reference temperature. In detail, in this embodiment, the pulse height of the second modulation signal P2 can be set first, and then the duty cycle and frequency of the second modulation signal P2 are adjusted by the temperature sensor 182 to enable illumination. The operating temperature of the diode 110 approaches the reference temperature.

Specifically, please refer to FIG. 1 and FIG. 4 simultaneously. In this embodiment, the temperature sensor 182 is configured to convert the detected operating temperature into a voltage, and the reference temperature can be converted into a reference voltage V. _Ref (in FIG. 4, the reference voltage V _ref is 2 volts). It is to be noted that the values of the voltages in this embodiment are for illustrative purposes only and are not intended to limit the invention.

In the present embodiment, for convenience of explanation, it is assumed that the voltage output by the temperature sensor 182 is proportional to the detected operating temperature. When the operating temperature is above the reference temperature, the temperature sensor 182 outputs a voltage V1 greater than the reference voltage V _ref to the comparing unit 184. At this time, the comparison unit 184 outputs a feedback signal to the pulse width modulation unit 140 to reduce the duty cycle of the second modulation signal P2 and increase the operating frequency by the pulse width modulation unit 140.

In detail, the duty cycle of the second modulation signal P2 is proportional to the pulse width, and the pulse width can be regarded as the time when the current passes through the light emitting diode 110. Therefore, reducing the duty cycle of the second modulation signal P2 can reduce the time of the light-emitting diode 110 through which the current passes, and reduce the heat generation rate of the light-emitting diode 110, thereby achieving the effect of lowering the operating temperature. . However, shortening the pulse width increases the pulse pitch, and when the pulse pitch is too large, the human eye will perceive that the light-emitting diode 110 is flickering, and generally the human eye does not notice the flicker above 60 Hz, so the pulse pitch is Must be less than 1/60sec. Therefore, in this embodiment, by increasing the frequency of the second modulation signal P2, the purpose of reducing the duty cycle of the second modulation signal P2 and maintaining the pulse spacing is achieved.

Conversely, when the operating temperature is below the reference temperature, the temperature sensor 182 outputs a voltage V2 that is less than the reference voltage V _ref to the comparing unit 184. At this time, the comparison unit 184 will output a feedback signal to the pulse width modulation unit 140 to increase the duty cycle of the second modulation signal P2 and reduce the operating frequency by the pulse width modulation unit 140.

In the above, the temperature sensor 182 repeatedly performs the above adjustment steps to bring the output voltage of the temperature sensor 182 closer to the reference voltage V _ref , and when the output voltage of the temperature sensor 182 approaches the reference voltage V _ref . Then, the operating temperature of the light emitting diode 110 approaches the reference temperature. Therefore, in this embodiment, the duty cycle and frequency of the second modulation signal P2 suitable for bringing the operating temperature of the LED 110 to the reference temperature can be obtained by the above adjustment step.

In addition, referring to FIG. 3 again, in the embodiment, the second modulation signal P2 is obtained by being modulated from the first modulation signal P1. In detail, the first modulation signal P1 can increase its pulse height from H1 to H2 via the peak modulation unit 130, and the first modulation signal P1 can pass its duty cycle, pulse width, and The pulse pitch and frequency are adjusted to D2, W2, G2, and f2 by D1, W1, G1, and f1, respectively.

Specifically, the brightness of the LEDs 110 is positively correlated with the pulse height of the modulation signal, and the product of the pulse height of the modulation signal and the duty cycle is proportional to the current through the LEDs 110. Therefore, this The embodiment is such that the pulse height of the second modulation signal P2 is greater than the pulse height of the first modulation signal P1, so that the LED 110 exhibits a second brightness greater than the first brightness.

However, when the duty cycle of the second modulation signal P2 is maintained to be the same as the duty cycle of the first modulation signal P1, the product of the pulse height of the second modulation signal P2 and the duty cycle will increase, and the LED is illuminated. The current of the body 110 and the operating temperature of the light-emitting diode 110 will increase accordingly. Therefore, the present invention is for passing the current through the light-emitting diode 110 controlled by the current control device 120 according to the first modulation signal P1 and the light-emitting diode 110 controlled by the current control device 120 according to the second modulation signal P2. The currents are equal in magnitude and the equation (1) is derived. It can be seen from the formula (1) that when the pulse height of the second modulation signal P2 is set to be greater than the pulse height of the first modulation signal P1, the duty cycle of the second modulation signal P2 needs to be adjusted to be smaller than the first modulation. The duty cycle of signal P1 is satisfied by equation (1).

In this embodiment, for convenience of description, H1 is set to 1V, H2 is 2V, W1 is 0.5ms, and both G1 and G2 are 0.5ms, wherein H1, D1, W1, G1, H2, D2, W2, and G2 are in accordance with The following formula: 1V. D1=2V. D2 T1=W1+G1=1ms

It can be known from the formula (2) that the duty cycle of the second modulation signal P2 is smaller than the duty cycle of the first modulation signal P1. It can be seen from equation (3) that the pulse width of the second modulation signal P2 is smaller than the pulse width of the first modulation signal P1. It can be seen from equation (4) that the frequency of the second modulation signal P2 is greater than the frequency of the first modulation signal P1. It can be known from equation (5) that if the pulse pitch of the second modulation signal P2 is further reduced to avoid flicker, the operating frequency of the second modulation signal P2 can be directly increased, and α is less than 1 and does not change the second. The duty cycle of the modulation signal P2. That is to say, in the embodiment, the effect of reducing the pulse interval of the second modulation signal P2 and not changing the duty cycle of the second modulation signal P2 can be achieved by increasing the operating frequency of the second modulation signal P2.

According to the above, since the second modulation signal P2 has a large pulse height Therefore, the brightness of the light-emitting diode 110 is greater than that of the first modulation signal P1. In order to keep the current through the light-emitting diode 110 constant, the second modulation signal P2 has a small duty cycle. In other words, the second modulation signal P2 has a smaller pulse width. Moreover, in order to make the pulse spacing of the second modulation signal P2 equal to the pulse spacing of the first modulation signal P1, the second modulation signal P2 needs to have a larger frequency.

In addition, in some applications, the brightness has been reached, and the heat generated by the LEDs 110 can be easily discharged through the medium. In this case, the temperature sensor 182 and the feedback control are not required, as long as the modulation signal is properly set. The duty cycle (D), pulse width (W), pulse spacing (G) and frequency (f) in P enable the LED diode 110 to operate stably at a safe temperature.

In addition, in this embodiment, each pulse interval of the second modulation signal P2 can be divided into multiple equal parts for each pulse width. Referring to FIG. 5, in the embodiment, each pulse interval of the second modulation signal P2 is divided into three equal parts, each pulse width is divided into five equal parts, and randomly arranged. The method of dispersing each pulse pitch and each pulse width of the second modulation signal P2 does not affect the duty cycle of the second modulation signal P2, and can reduce the pulse interval of the second modulation signal P2, thereby making the human It is even more difficult for the eye to notice that the brightness exhibited by the light-emitting diode 110 is flickering. The random pattern generator can divide each pulse pitch of the second modulation signal P2 into multiple aliquots for each pulse width, and can be integrated in the circuit board S of FIG. 2A, or integrated in In the control wafer C of FIGS. 2B to 2E.

In summary, the present invention is to increase the pulse height of the modulated signal. The method is to increase the brightness of the light-emitting diode, and to maintain the current through the light-emitting diode and the heat energy generated by the light-emitting diode by reducing the duty cycle. Moreover, in order to keep the pulse pitch of the modulated signal of the present invention constant, the present invention increases the frequency of the modulated signal. In addition, the present invention can use the temperature sensor to bring the operating temperature of the light-emitting diode closer to the reference temperature. In addition, the present invention can also divide each pulse pitch of the modulated signal into multiple aliquots for each pulse width to reduce the pulse pitch, thereby making it more difficult for the human eye to perceive that the brightness exhibited by the light-emitting diode is flickering.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Lighting diode module

110‧‧‧Lighting diode

120‧‧‧current control device

122‧‧‧ gate

124‧‧‧汲polar

130‧‧‧peak modulation unit

140‧‧‧ pulse width modulation unit

150‧‧‧Power supply unit

160‧‧‧Voltage modulation device

170‧‧‧Electrostatic protection device

180‧‧‧temperature controller

182‧‧‧temperature sensor

184‧‧‧Comparative unit

200, S‧‧‧ circuit board

190‧‧‧ radiator

310‧‧‧Package colloid

320‧‧‧ screws

A‧‧‧ chip package

B‧‧‧Bumps

C‧‧‧Control chip

P1‧‧‧First modulation signal

P2‧‧‧ second modulation signal

S‧‧‧ wafer stack structure

V1, V2‧‧‧ voltage

V _ref ‧‧‧reference voltage

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

2A is a cross-sectional view of the light emitting diode module of FIG. 1.

2B, 2C, 2D, and 2E are cross-sectional views showing various changes in the structure of the light-emitting diode module according to an embodiment of the present invention.

3 is a schematic diagram of a first modulation signal and a second modulation signal according to an embodiment of the invention.

4 is a graph showing the relationship between the voltage outputted by the temperature sensor and the time when the LED module of FIG. 1 is operated.

FIG. 5 is a schematic diagram of a second modulation signal according to an embodiment of the invention.

100‧‧‧Lighting diode module

110‧‧‧Lighting diode

120‧‧‧current control device

122‧‧‧ gate

124‧‧‧汲polar

130‧‧‧peak modulation unit

140‧‧‧ pulse width modulation unit

150‧‧‧Power supply unit

160‧‧‧Voltage modulation device

170‧‧‧Electrostatic protection device

180‧‧‧temperature controller

182‧‧‧temperature sensor

184‧‧‧Comparative unit

Claims (18)

A method for improving the brightness of a light-emitting diode is adapted to increase the brightness of a light-emitting diode from a first brightness to a second brightness, wherein the light-emitting diode is controlled by a first modulation signal Presenting the first brightness, the pulse height, the duty cycle, and the frequency of the first modulation signal are respectively H1, D1, and f1, and the method for improving the brightness of the LED includes: controlling the second modulation signal Light-emitting diodes, such that the light-emitting diodes exhibit the second brightness, wherein the pulse height, duty cycle, and frequency of the second modulation signal are H2, D2, and f2, respectively, and H1, D1, f1, and H2 D2 and f2 satisfy the following conditions: H1. D1=H2. D2; H2>H1; D2<D1; and f2>f1. The method for improving the brightness of a light-emitting diode according to the first aspect of the invention, wherein the method for controlling the light-emitting diode through the second modulation signal comprises: providing the second modulation signal to a current control The device, wherein the current control device controls current through the light emitting diode according to the second modulation signal. A method for improving the brightness of a light-emitting diode as described in claim 1 wherein D2≦1. A method for improving the brightness of a light-emitting diode as described in claim 1 wherein f2>f1 60 Hz. The method for improving the brightness of a light-emitting diode according to the first aspect of the invention, further comprising: detecting an operating temperature of the light-emitting diode through a temperature sensor; and according to the operating temperature and a reference temperature The comparison result adjusts the duty cycle and frequency of the second modulation signal such that the operating temperature of the light emitting diode approaches the reference temperature. The method for improving the brightness of a light-emitting diode according to the first aspect of the invention, wherein the second modulation signal is obtained by modulating the first modulation signal. A light emitting diode module includes: a light emitting diode, wherein the light emitting diode exhibits the first brightness when the light emitting diode is controlled by a first modulation signal, and the first modulation The pulse height, duty cycle, and frequency of the signal are respectively H1, D1, and f1; a current control device coupled to the light emitting diode; a peak modulation unit coupled to the current control device; and a pulse width modulation a unit, coupled to the peak modulation unit, the pulse width modulation unit and the peak modulation unit are adapted to generate a second modulation signal to the current control device, wherein the current control device is adapted to be based on the second modulation The variable signal controls the current passing through the light emitting diode such that the light emitting diode exhibits a second brightness greater than the first brightness, and the pulse height, duty cycle, and frequency of the second modulation signal are respectively H2 and D2. , f2, and H1, D1, f1, H2, D2, and f2 satisfy the following conditions: H1. D1=H2. D2; H2>H1; D2<D1; and f2>f1. The illuminating diode module of claim 7, further comprising a temperature controller, comprising: a temperature sensor adapted to sense an operating temperature of the illuminating diode; and a comparison The unit is coupled to the temperature sensor and adapted to generate a feedback signal to the pulse width modulation unit according to the comparison result of the operating temperature and a reference temperature to adjust a duty cycle of the second modulation signal The frequency is such that the operating temperature of the light emitting diode approaches the reference temperature. The illuminating diode module of claim 7, wherein the second modulating signal is obtained by adjusting the first modulating signal via the pulse width modulation unit and the peak modulating unit. The light-emitting diode module according to claim 7, wherein D2≦1 is between. The light emitting diode module of claim 7, wherein f2>f1 60Hz. The light-emitting diode module of claim 7, wherein the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a wafer. The illuminating diode module of claim 7, wherein the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a circuit board. The illuminating diode module of claim 7, wherein the current control device is a transistor component, and a gate or a base of the transistor component is coupled to the peak modulation unit, the transistor A drain or collector of the component is coupled to the light emitting diode. The light-emitting diode module of claim 14, further comprising: an electrostatic protection device coupled to the drain, and the electrostatic protection device is connected in parallel with the light-emitting diode. The light-emitting diode module of claim 7, further comprising: a power supply device; and a voltage modulation device coupled to the power supply device and the light-emitting diode, the power supply device The system is adapted to provide a system voltage to the voltage modulation device, and the voltage modulation device is adapted to adjust the system voltage to a driving voltage for input to the light emitting diode. The light-emitting diode module of claim 16, wherein the voltage modulation device, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a wafer. The light-emitting diode module of claim 16, wherein the voltage modulation device, the temperature control device, the peak modulation unit, and the pulse width modulation unit are integrated into a circuit board.