Projection device and light source system thereof
By using control circuits and drivers to switch light sources driving different color lights in the light source system of the projection device, the problem of adding driving circuits when adding light source modules in the prior art is solved, and the effect of simplifying the circuit and reducing manufacturing costs is achieved.
Patent Information
- Application Number
- CN202311388330.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-25
- Publication Date
- 2025-04-25
AI Technical Summary
When existing projectors increase light source modules to improve brightness, they need to add corresponding driving circuits, resulting in an increase in circuit substrate area, product volume, circuit complexity and manufacturing costs.
By introducing control circuits and drivers into the light source system of the projection device, the light sources that drive different color lights by using the pulse width modulation signal is switched to realize the use of one driver for driving multiple light sources, and the number of driving circuits is reduced.
It effectively avoids the increase in the circuit substrate area and product volume, simplifies the circuit structure, and reduces product manufacturing costs.
Smart Images
Figure CN119882334A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a display device, and more particularly to a projection device and a light source system thereof. Background Art
[0002] Generally speaking, a projector often uses three driving circuits to drive the red (R), green (G), and blue (B) light sources in the light source module respectively. If a light source module is added to increase the brightness, the driving circuit must be added accordingly. For example, a light source module including three light sources, namely, a red light source, a green light source, and a blue light source, requires three driving circuits to drive it. If the number of light source modules is increased to two, six driving circuits are required to drive it. This will increase the area of the circuit substrate or the volume of the product, complicate the circuit, and also increase the manufacturing cost of the product.
[0003] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it mean that it has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention
[0004] The present invention provides a projection device and a light source system thereof, which can effectively avoid the increase of the area of a circuit substrate or the volume of a product, simplify the circuit, and thus reduce the manufacturing cost of the product.
[0005] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.
[0006] To achieve one or part or all of the above purposes or other purposes, the light source system of the projection device of the present invention is used to provide an illumination beam. The light source system includes a light source module, a driver and a control circuit. The light source module includes a first light source, a second light source and a third light source. The first light source, the second light source and the third light source are used to provide a first light beam, a second light beam and a third light beam respectively. The first light beam, the second light beam and the third light beam have different wavelength ranges respectively. The driver is coupled to the light source module, and the driver is used to drive the light source module. The control circuit is coupled to the driver, and the control circuit outputs a pulse width modulation signal to the driver according to a selection signal, and the pulse width modulation signal is one of the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal received by the control circuit, wherein the driver drives one of the first light source, the second light source and the third light source corresponding to the selection signal with the pulse width modulation signal, and the illumination beam includes one of the first light beam, the second light beam and the third light beam.
[0007] The present invention also provides a projection device, which includes a light source system, at least one light valve and a projection lens. The light source system is used to provide an illumination beam. The light valve is arranged on the transmission path of the illumination beam from the light source system, and is used to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam, and is used to project the image beam out of the projection device. The light source system includes a light source module, a driver and a control circuit. The light source module includes a first light source, a second light source and a third light source. The first light source, the second light source and the third light source are used to provide a first light beam, a second light beam and a third light beam respectively. The first light beam, the second light beam and the third light beam have different wavelength ranges respectively. The driver is coupled to the light source module, and the driver is used to drive the light source module. The control circuit is coupled to the driver, and the control circuit outputs a pulse width modulation signal to the driver according to a selection signal, and the pulse width modulation signal is one of the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal received by the control circuit, wherein the driver drives one of the first light source, the second light source and the third light source corresponding to the selection signal with the pulse width modulation signal, and the illumination beam includes one of the first light beam, the second light beam and the third light beam.
[0008] Based on the above, the control circuit of the present invention selects to output one of the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal according to the selection signal, and the driver drives the light source corresponding to the selection signal with the pulse width modulation signal provided by the control circuit. In this way, by switching the driven light source according to the selection signal by the control circuit and the driver, the area of the circuit substrate or the volume of the product can be effectively avoided, the circuit can be simplified, and the manufacturing cost of the product can be reduced.
[0009] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a schematic diagram of a projection device according to an embodiment of the present invention.
[0011] Figure 2 is a schematic diagram of a light source system of a projection device according to an embodiment of the present invention.
[0012] Figure 3 is a schematic diagram of a light source system of a projection device according to another embodiment of the present invention.
[0013] Figure 4 is a schematic diagram of a control circuit according to an embodiment of the present invention.
[0014] Figure 5 is a schematic diagram of a light source system of a projection device according to another embodiment of the present invention. DETAILED DESCRIPTION
[0015] The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.
[0016] Figure 1 is a schematic diagram of a projection device according to an embodiment of the present invention, please refer to Figure 1 The projection device 100 may include a light source system 102, at least one light valve 104, and a projection lens 106, wherein the light source system 102 is used to provide an illumination beam L1, the light valve 104 is disposed on a transmission path of the illumination beam L1 from the light source system 102, and is used to convert the illumination beam L1 into an image beam L2, and the projection lens 106 is disposed on a transmission path of the image beam L2, and is used to project the image beam L2 out of the projection device 100.
[0017] Furthermore, the light source system 102 may be Figure 2 As shown, it includes a control circuit 202, a driver 204 and a light source module 206, and the driver 204 is coupled to the control circuit 202 and the light source module 206. The light source module 206 may include a first light source 208, a second light source 210 and a third light source 212 of different colors, and the first light source 208, the second light source 210 and the third light source 212 may respectively provide a first light beam, a second light beam and a third light beam with different wavelength ranges, and the above-mentioned illumination light beam L1 includes at least one of the first light beam, the second light beam and the third light beam.
[0018] The driver 204 is used to drive the light source module 206. The control circuit 202 can select one of the first pulse width modulation signal PWMR, the second pulse width modulation signal PWMG and the third pulse width modulation signal PWMB as the pulse width modulation signal PWM to output to the driver 204 according to the selection signal SL1, wherein the selection signal SL1 can be provided by the processor of the projection device 100, such as a DLP data processor (DDP), but not limited thereto. The driver 204 can drive the light source corresponding to the selection signal SL1, that is, one of the first light source 208, the second light source 210 and the third light source 212, with the pulse width modulation signal PWM from the control circuit 202. For example, the pulse width modulation signal and the light source corresponding to the selection signal SL1 are the second pulse width modulation signal PWMG and the second light source 210 respectively, and the control circuit 202 can select and output the second pulse width modulation signal PWMG as the pulse width modulation signal PWM according to the selection signal SL1, and the driver 204 can drive the second light source 210 with the pulse width modulation signal PWM.
[0019] In this way, the control circuit 202 and the driver 204 switch the light source to be driven according to the selection signal SL1, and use a driver 204 coupled to the light source module 206 to drive the first light source 208, the second light source 210 and the third light source 212 in the light source module 206 respectively. This can reduce the number of drivers or driving circuits used, effectively avoid the increase in the area of the circuit substrate or the volume of the product, simplify the circuit, and thus reduce the product manufacturing cost.
[0020] In detail, the light source system 102 can be implemented as follows: Figure 3 As shown, the control circuit 202 includes a multiplexer 302 and a logic circuit 304, and the driver 204 includes a driving circuit 306, a switching circuit 308 and a smoothing circuit 310. In addition, in this embodiment, Figure 2 The first light source 208, the second light source 210 and the third light source 212 are shown in FIG. Figure 3 The red light source R1, green light source G1 and blue light source B1 of the light source module 206 are used for implementation. The red light source R1, green light source G1 and blue light source B1 can be solid-state lighting electronic components. For example, each light source can be one or more light-emitting diodes (LEDs), one or more laser diodes (LDs), or a combination of light-emitting diodes (LEDs) and laser diodes (LDs), but is not limited thereto. In addition, the number of solid-state lighting electronic components used in the first light source 208, the second light source 210 and the third light source 212 is not limited and can also be different from each other. In the present embodiment, the first light source 208 includes 4 solid-state lighting electronic components that generate red light to form the red light source R1, the second light source 210 includes 2 solid-state lighting electronic components that generate blue light to form the blue light source B1, and the third light source 212 includes 3 solid-state lighting electronic components that generate green light to form the green light source G1.
[0021] The logic circuit 304 is used to receive the selection signal SL1, and generate a first enable signal ENR, a second enable signal ENG, and a third enable signal ENB according to the selection signal SL1. The multiplexer 302 is coupled to the logic circuit 304, and can select one of the first pulse width modulation signal PWMR, the second pulse width modulation signal PWMG, and the third pulse width modulation signal PWMB as the pulse width modulation signal PWM according to the first enable signal ENR, the second enable signal ENG, and the third enable signal ENB, and output the pulse width modulation signal PWM to the driving circuit 306 of the driver 204. The selection signal SL1 can be sent by the processor of the projection device, and can be, for example, a two-bit control signal. In this embodiment, for example but not limited to, as shown in the following Table 1 and Table 2:
[0022] Table 1: Table showing voltage levels of the selection signal SL1 corresponding to the first enable signal ENR, the second enable signal ENG and the third enable signal ENB.
[0023]
[0024] Table 2: A table showing the voltage levels of the pulse width modulation signal PWM corresponding to the first enable signal ENR, the second enable signal ENG and the third enable signal ENB.
[0025]
[0026] When the selection signal SL1 is "0" and "0", the logic circuit 304 can correspondingly output the first enable signal ENR, the second enable signal ENG and the third enable signal ENB of low voltage level, and the multiplexer 302 does not output the pulse width modulation signal PWM. When the selection signal SL1 is "0" and "1", the logic circuit 304 can correspondingly output the first enable signal ENR of high voltage level and the second enable signal ENG and the third enable signal ENB of low voltage level, and the multiplexer 302 can select the first pulse width modulation signal PWMR as the pulse width modulation signal PWM according to the first enable signal ENR of high voltage level. Similarly, when the selection signal SL1 is "1" and "0", "1" and "1", the logic circuit 304 can respectively output the second enable signal ENG and the third enable signal ENB of the high voltage level, and the multiplexer 302 can select the second pulse width modulation signal PWMG and the third pulse width modulation signal PWMB as the pulse width modulation signal PWM according to the second enable signal ENG and the third enable signal ENB of the high voltage level.
[0027] The driving circuit 306 can receive the pulse width modulation signal PWM provided by the multiplexer 302 of the control circuit 202, and use the pulse width modulation signal PWM to drive the red light source R1, the green light source G1 or the blue light source B1 in the light source module 206. Further, the switching circuit 308 is coupled to the driving circuit 306 and the logic circuit 304, and can switch the driving circuit 306 to one of the first light source 208 (i.e., the red light source R1), the second light source 210 (i.e., the green light source G1) and the third light source 212 (i.e., the blue light source B1) according to the first enable signal ENR, the second enable signal ENG and the third enable signal ENB from the logic circuit 304, so that the driving circuit 306 outputs the pulse width modulation signal PWM to drive one of the first light source 208 (i.e., the red light source R1), the second light source 210 (i.e., the green light source G1) and the third light source 212 (i.e., the blue light source B1) corresponding to the selection signal SL1. In addition, one end of the smoothing circuit 310 is coupled to the switching circuit 308 and the light source module 206, and can smooth the voltage output by the switching circuit 308 to stabilize the light emission of the first light source 208 (i.e., the red light source R1), the second light source 210 (i.e., the green light source G1), and the third light source 212 (i.e., the blue light source B1). In some embodiments, the driver 204 may not include the smoothing circuit 310.
[0028] Further, the switching circuit 308 may include, for example, a first switch MR1, a second switch MG1, and a third switch MB1. The first switch MR1 is coupled between the driving circuit 306 and the first light source 208 (i.e., the red light source R1), the second switch MG1 is coupled between the driving circuit 306 and the second light source 210 (i.e., the green light source G1), and the third switch MB1 is coupled between the driving circuit 306 and the third light source 212 (i.e., the blue light source B1). The conduction states of the first switch MR1, the second switch MG1, and the third switch MB1 are controlled by the first enable signal ENR, the second enable signal ENG, and the third enable signal ENB output by the control logic circuit 304, respectively. By turning on one of the first switch MR1, the second switch MG1, and the third switch MB1, the driving circuit 306 is switched to connect to one of the first light source 208 (i.e., the red light source R1), the second light source 210 (i.e., the green light source G1), and the third light source 212 (i.e., the blue light source B1). For example, when the first enable signal ENR is at a high voltage level, the first switch MR1 is controlled by the first enable signal ENR to be turned on, and the second switch MG1 and the third switch MB1 remain in an off state, so that the drive circuit 306 can be switched to connect to the first light source 208 (i.e., the red light source R1). At this time, by switching on in this way, the pulse width modulation signal PWM provided by the multiplexer 302 to the drive circuit 306 can be further output to the first light source 208 (i.e., the red light source R1) for driving, so as to illuminate the red light solid-state lighting electronic components in the light source module 206.
[0029] In addition, the smoothing circuit 310 may include a first capacitor CR1, a second capacitor CG1, and a third capacitor CB1. The first capacitor CR1 is coupled between the first switch MR1 and the ground voltage, the second capacitor CG1 is coupled between the second switch MG1 and the ground voltage, and the third capacitor CB1 is coupled between the third switch MB1 and the ground voltage. The first capacitor CR1, the second capacitor CG1, and the third capacitor CB1 may be used to smooth the voltages provided by the first switch MR1, the second switch MG1, and the third switch MB1, respectively. In further detail, the first capacitor CR1, the second capacitor CG1, and the third capacitor CB1 are mainly used to reduce the ripple current. Meanwhile, considering that when any of the first switch MR1, the second switch MG1, and the third switch MB1 is in the off state, if there is still current in the corresponding circuit that has not been fully discharged, the corresponding light source (such as one of the first light source 208, the second light source 210, and the third light source 212) may emit light even though it should be turned off, the capacitance value may be designed according to the number of solid-state lighting electronic components used by the first light source 208, the second light source 210, and the third light source 212. In this embodiment, the first light source 208 includes 4 red laser diodes, the second light source 210 includes 2 blue laser diodes, the third light source 212 includes 3 green laser diodes, the capacitance value of the first capacitor CR1 can fall within the range of 5μF to 8μF, the capacitance value of the second capacitor CG1 can fall within the range of 3μF to 6μF, and the capacitance value of the third capacitor CB1 can fall within the range of 8μF to 11μF.
[0030] In other embodiments, the control circuit 202 may further include an OR gate and a non-inverting amplifier. Figure 4 In the embodiment, the OR gate 402 is coupled between the logic circuit 304 and the multiplexer 302, and the non-inverting amplifier 404 is coupled between the multiplexer 302 and the driver 204 ( Figure 4 Not shown). In the present embodiment, the input terminals A, B, and C of the OR gate 402 are respectively used to receive the first enable signal ENR, the second enable signal ENG, and the third enable signal ENB, and the output terminal Y of the OR gate 402 is coupled to the enable input terminal EN of the multiplexer 302. The input terminals S1 to S3 of the multiplexer 302 respectively receive the first pulse width modulation signal PWMR, the second pulse width modulation signal PWMG, and the third pulse width modulation signal PWMB, and the selection input terminals A0 and A1 of the multiplexer 302 respectively receive the first enable signal ENR and the second enable signal ENG. The non-inverting amplifier 404 may include a resistor R and an operational amplifier A1, the positive input terminal of the operational amplifier A1 is coupled to the output terminal D of the multiplexer 302, the negative input terminal and the output terminal of the operational amplifier A1 are connected to each other, and the output terminal of the operational amplifier A1 is coupled to Figure 3 The driver circuit 306 of the driver 204 ( Figure 4 The resistor R is coupled between the positive input terminal of the operational amplifier A1 and the ground.
[0031] The OR gate 402 can enable the multiplexer 302 according to the first enable signal ENR, the second enable signal ENG and the third enable signal ENB. For example, when any one of the first enable signal ENR, the second enable signal ENG and the third enable signal ENB is at a high voltage level, the OR gate 402 outputs an enable signal of a high voltage level through the output terminal Y to the enable input terminal EN of the multiplexer 302 to enable the multiplexer 302. The multiplexer 302 can select one of the first pulse width modulation signal PWMR, the second pulse width modulation signal PWMG and the third pulse width modulation signal PWMB as the pulse width modulation signal PWM for output according to the first enable signal ENR and the second enable signal ENG respectively received by the selection input terminals A0 and A1. For example, when the first enable signal ENR and the second enable signal ENG respectively received by the selection input terminals A0 and A1 of the multiplexer 302 are both at a low voltage level, the third pulse width modulation signal PWMB is output; when the first enable signal ENR received by the selection input terminal A0 of the multiplexer 302 is at a high voltage level and the second enable signal ENG received by the selection input terminal A1 is at a low voltage level, the first pulse width modulation signal PWMR is output; when the first enable signal ENR received by the selection input terminal A0 of the multiplexer 302 is at a low voltage level and the second enable signal ENG received by the selection input terminal A1 is at a high voltage level, the second pulse width modulation signal PWMG is output, but the present invention is not limited thereto. The function of the non-inverting amplifier 404 is to isolate the circuit to prevent the resistance of the front-end circuit and the back-end circuit from affecting each other, thereby affecting the voltage accuracy of the pulse width modulation signal PWM, and also reducing noise. The non-inverting amplifier 404 can amplify the pulse width modulation signal PWM provided by the multiplexer 302 to the driving circuit 306 of the driver 204.
[0032] It is worth noting that the above embodiments are described by taking the light source system including one light source module as an example, but in other embodiments, the light source system may also include multiple light source modules. Figure 5 As shown, the light source system includes a plurality of light source modules 206, 506. In addition, the driver 204 also corresponds to the light source modules 206, 506 and further includes a plurality of driving circuits 306, 502, a plurality of switching circuits 308, 508 and a plurality of smoothing circuits 310, 510. Figure 3 The light source module 206 in FIG. 1 may include a first light source (i.e., a red light source R2), a second light source (i.e., a green light source G2), and a third light source (i.e., a blue light source B2). The switching circuit 508 couples the light source module 506 and the driving circuit 502. The switching circuit 508 and the Figure 3The switching circuit 308 in FIG. 1 may include, for example, a first switch MR2, a second switch MG2, and a third switch MB2. The smoothing circuit 510 is similar to the switching circuit 308 in FIG. Figure 3 , may include a first capacitor CR2, a second capacitor CG2, and a third capacitor CB2. Similarly, the switching circuit 508 may also be controlled by the first enable signal ENR, the second enable signal ENG, and the third enable signal ENB to connect the driving circuit 502 to the light source corresponding to the selection signal SL1 to drive the light source. Since the implementation details of the driving circuit 502, the light source module 506, the switching circuit 508, and the smoothing circuit 510 are similar to the driving circuit 306, the light source module 206, the switching circuit 308, and the smoothing circuit 310 of the above-mentioned embodiment, they are not repeated here. In the present embodiment, the driving circuits 306, 502 are coupled to the corresponding light source modules 206, 506, and the control circuit 202 is coupled to and outputs a pulse width modulation signal PWM to the driving circuits 306, 502 in the driver 204 to simultaneously drive the light source modules 206, 506. Furthermore, the driving circuits 306 and 502 can simultaneously receive the pulse width modulation signal PWM from the control circuit 202, and the switching circuits 308 and 508 switch on the light source corresponding to the selection signal SL1 according to the first enable signal ENR, the second enable signal ENG and the third enable signal ENB, so as to simultaneously light up the light sources of the same color light in the light source modules 206 and 506.
[0033] In summary, the control circuit of the present invention selects to output one of the first pulse width modulation signal, the second pulse width modulation signal and the third pulse width modulation signal according to the selection signal, and the driver drives the light source corresponding to the selection signal with the pulse width modulation signal provided by the control circuit. In this way, by switching the driven light source according to the selection signal by the control circuit and the driver, the area of the circuit substrate or the volume of the product can be effectively avoided from increasing, the circuit can be simplified, and the manufacturing cost of the product can be reduced.
[0034] However, the above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the content of the invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. Furthermore, the first, second, etc. mentioned in the specification are only used to indicate the names of the components, and are not used to limit the upper or lower limits on the number of components.
Claims
1. A light source system for a projection device, for providing an illumination beam, characterized in that: The light source system of the projection device includes a light source module, a driver and a control circuit, wherein: The light source module comprises a first light source, a second light source and a third light source, wherein the first light source, the second light source and the third light source are used to provide a first light beam, a second light beam and a third light beam respectively, and the first light beam, the second light beam and the third light beam respectively have different wavelength ranges; The driver is coupled to the light source module, and the driver is used to drive the light source module; and The control circuit is coupled to the driver, and the control circuit outputs a pulse width modulation signal to the driver according to a selection signal, wherein the pulse width modulation signal is one of a first pulse width modulation signal, a second pulse width modulation signal, and a third pulse width modulation signal received by the control circuit. The driver drives one of the first light source, the second light source and the third light source corresponding to the selection signal with the pulse width modulation signal, and the illumination light beam includes one of the first light beam, the second light beam and the third light beam.
2. The light source system of the projection device according to claim 1, characterized in that: The control circuit includes a logic circuit and a multiplexer, wherein: The logic circuit is used to receive the selection signal, and the logic circuit generates a first enable signal, a second enable signal, and a third enable signal according to the selection signal; and The multiplexer is coupled to the logic circuit, selects one of the first PWM signal, the second PWM signal and the third PWM signal as the PWM signal according to the first enable signal, the second enable signal and the third enable signal, and outputs the PWM signal to the driver.
3. The light source system of the projection device according to claim 2, characterized in that: The selection signal is a two-bit control signal.
4. The light source system of the projection device according to claim 2, characterized in that: The driver comprises a driving circuit and a switching circuit, wherein: The driving circuit receives the pulse width modulation signal provided by the control circuit; and The switching circuit couples the driving circuit and the logic circuit, and switches the driving circuit to one of the first light source, the second light source and the third light source according to the first enable signal, the second enable signal and the third enable signal from the logic circuit, so that the driving circuit outputs the pulse width modulation signal to drive one of the first light source, the second light source and the third light source corresponding to the selection signal.
5. The light source system of the projection device according to claim 4, characterized in that: The switching circuit includes a first switch, a second switch and a third switch, wherein: The first switch is coupled between the driving circuit and the first light source, and is controlled by the first enable signal to change the conduction state; The second switch is coupled between the driving circuit and the second light source, and is controlled by the second enable signal to change the conduction state; and The third switch is coupled between the driving circuit and the third light source, and is controlled by the third enabling signal to change a conducting state.
6. The light source system of the projection device according to claim 5, characterized in that: Includes a smoothing circuit, where: The smoothing circuit is coupled to the switching circuit, and the smoothing circuit is used to smooth the voltage output by the switching circuit, wherein the smoothing circuit includes a first capacitor, a second capacitor, and a third capacitor, wherein: The first capacitor is coupled between the first switch and a ground voltage; The second capacitor is coupled between the second switch and the ground voltage; and The third capacitor is coupled between the third switch and the ground voltage.
7. The light source system of the projection device according to claim 6, characterized in that: The first light source is a red light source, and the capacitance value of the first capacitor falls within 5μF to 8μF, the second light source is a green light source, and the capacitance value of the second capacitor falls within 3μF to 6μF, and the third light source is a blue light source, and the capacitance value of the third capacitor falls within 8μF to 11μF.
8. The light source system of the projection device according to claim 2, characterized in that: The control circuit further comprises an OR gate, wherein: The OR gate is coupled between the logic circuit and the multiplexer, and receives the first enable signal, the second enable signal, and the third enable signal to enable the multiplexer, so that the multiplexer outputs the PWM signal.
9. The light source system of the projection device according to claim 2, characterized in that: The control circuit also includes a non-inverting amplifier, wherein: The non-inverting amplifier is coupled between the multiplexer and the driver, and is used for amplifying the pulse width modulation signal output by the multiplexer.
10. The light source system of the projection device according to claim 1, characterized in that: There are multiple light source modules, and the driver includes multiple driving circuits, each of which is coupled to the corresponding light source module. The control circuit is coupled and outputs the pulse width modulation signal to the multiple driving circuits to simultaneously drive each of the multiple light source modules.
11. A projection device, characterized in that: The projection device comprises a light source system, at least one light valve and a projection lens, wherein: The light source system is used to provide an illumination beam; The at least one light valve is disposed on a transmission path of the illumination light beam from the light source system, and is used to convert the illumination light beam into an image light beam; and The projection lens is disposed on the transmission path of the image light beam and is used to project the image light beam out of the projection device. The light source system includes a light source module, a driver and a control circuit, wherein: The light source module comprises a first light source, a second light source and a third light source, wherein the first light source, the second light source and the third light source are used to provide a first light beam, a second light beam and a third light beam respectively, and the first light beam, the second light beam and the third light beam respectively have different wavelength ranges; The driver is coupled to the light source module, and the driver is used to drive the light source module; and The control circuit is coupled to the driver, and the control circuit outputs a pulse width modulation signal to the driver according to a selection signal, wherein the pulse width modulation signal is one of a first pulse width modulation signal, a second pulse width modulation signal, and a third pulse width modulation signal received by the control circuit. The driver drives one of the first light source, the second light source and the third light source corresponding to the selection signal with the pulse width modulation signal, and the illumination light beam includes one of the first light beam, the second light beam and the third light beam.
12. The projection device according to claim 11, characterized in that: The control circuit includes a logic circuit and a multiplexer, wherein: The logic circuit is used to receive the selection signal, and the logic circuit generates a first enable signal, a second enable signal, and a third enable signal according to the selection signal; and The multiplexer is coupled to the logic circuit, selects one of the first PWM signal, the second PWM signal and the third PWM signal as the PWM signal according to the first enable signal, the second enable signal and the third enable signal, and outputs the PWM signal to the driver.
13. The projection device according to claim 12, characterized in that: The selection signal is a two-bit control signal.
14. The projection device according to claim 12, characterized in that: The driver comprises a driving circuit and a switching circuit, wherein: The driving circuit receives the pulse width modulation signal provided by the control circuit; and The switching circuit is coupled to the driving circuit, and switches the driving circuit to one of the first light source, the second light source and the third light source according to the first enable signal, the second enable signal and the third enable signal, so that the driving circuit outputs the pulse width modulation signal to drive one of the first light source, the second light source and the third light source corresponding to the selection signal.
15. The projection device according to claim 14, characterized in that: The switching circuit includes a first switch, a second switch and a third switch, wherein: The first switch is coupled between the driving circuit and the first light source, and is controlled by the first enable signal to change the conduction state; The second switch is coupled between the driving circuit and the second light source, and is controlled by the second enable signal to change the conduction state; and The third switch is coupled between the driving circuit and the third light source, and is controlled by the third enabling signal to change a conducting state.
16. The projection device according to claim 15, characterized in that: The light source system comprises a smoothing circuit, wherein: The smoothing circuit is coupled to the switching circuit, and the smoothing circuit is used to smooth the voltage output by the switching circuit, wherein the smoothing circuit includes a first capacitor, a second capacitor, and a third capacitor, wherein: The first capacitor is coupled between the first switch and a ground voltage; The second capacitor is coupled between the second switch and the ground voltage; and The third capacitor is coupled between the third switch and the ground voltage.
17. The projection device according to claim 16, characterized in that: The first light source is a red light source, and the capacitance value of the first capacitor falls within 5μF to 8μF, the second light source is a green light source, and the capacitance value of the second capacitor falls within 3μF to 6μF, and the third light source is a blue light source, and the capacitance value of the third capacitor falls within 8μF to 11μF.
18. The projection device according to claim 12, characterized in that: The control circuit further comprises an OR gate, wherein: The OR gate is coupled between the logic circuit and the multiplexer, and receives the first enable signal, the second enable signal, and the third enable signal to enable the multiplexer, so that the multiplexer outputs the PWM signal.
19. The projection device according to claim 12, characterized in that: The control circuit also includes a non-inverting amplifier, wherein: The non-inverting amplifier is coupled between the multiplexer and the driver, and is used for amplifying the pulse width modulation signal output by the multiplexer.
20. The projection device according to claim 11, characterized in that: There are multiple light source modules, and the driver includes multiple driving circuits, each of which is coupled to the corresponding light source module. The control circuit is coupled and outputs the pulse width modulation signal to the multiple driving circuits to simultaneously drive each of the multiple light source modules.