Solid-state light source driving circuit and electronic equipment

Abstract

The utility model discloses a solid-state light source driving circuit and electronic equipment. The solid-state light source driving circuit comprises a solid-state light source; the output end of the driver is connected with the solid-state light source; the capacitive circuit is connected between the output end of the driver and the solid-state light source; the discharging circuit and the capacitor circuit are connected in parallel between the output end of the driver and the solid-state light source, and are connected to the control end of the driver; one end of the brightness maintaining circuit is connected with the solid-state light source, and the other end is connected between the control end of the driver and the discharging circuit; wherein the brightness maintaining circuit collects an electric signal of the solid-state light source; based on the electric signal, the driver controls the discharging circuit to be switched from a first working state to a second working state, brightness maintenance of the solid-state light source is achieved, the first working state indicates that the discharging circuit executes discharging operation, and the second working state indicates that the discharging circuit does not execute discharging operation. According to the invention, the color purity is guaranteed and the brightness is not affected during the switching of the solid-state light source.

Description

Technical Field

[0001] The embodiments disclosed in this application relate to the field of projection technology, and more specifically, to a solid-state light source driving circuit and electronic device. Background Technology

[0002] In the field of digital projection display, optical engine systems commonly employ an RGB three-color timing-driven scheme to achieve color synthesis. To ensure color purity during color wheel switching, the industry typically requires the light source driving circuit to have an extremely short falling edge response time when switching RGB channels. Current mainstream solutions use a discharge circuit to forcibly release the residual charge of the energy storage capacitor at the back end of the LED driver, thereby accelerating the light source's shutdown process. However, in high-speed timing-switching scenarios, this design suffers from dynamic response lag, leading to fluctuations or a decrease in overall light output brightness. Utility Model Content

[0003] According to embodiments of this application, this application proposes a solid-state light source driving circuit and electronic device to solve the above-mentioned problems.

[0004] The first aspect of this application discloses a solid-state light source driving circuit, comprising: a solid-state light source; a driver, the output terminal of which is connected to the solid-state light source; a capacitor circuit connected between the output terminal of the driver and the solid-state light source; a discharge circuit connected in parallel with the capacitor circuit between the output terminal of the driver and the solid-state light source, and connected to the control terminal of the driver; and a brightness maintenance circuit, one end of which is connected to the solid-state light source, and the other end of which is connected between the control terminal of the driver and the discharge circuit; wherein the brightness maintenance circuit acquires an electrical signal from the solid-state light source; based on the electrical signal, the driver controls the discharge circuit to switch from a first operating state to a second operating state to maintain the brightness of the solid-state light source, wherein the first operating state indicates that the discharge circuit performs a discharge operation, and the second operating state indicates that the discharge circuit does not perform a discharge operation.

[0005] In some embodiments, the brightness maintenance circuit includes a first switching transistor and a comparator; wherein, a first terminal of the first switching transistor is connected to the control terminal of the driver and the discharge circuit, a second terminal of the first switching transistor is connected to the comparator, and a third terminal of the first switching transistor is connected to ground; the negative input terminal of the comparator is connected to the positive electrode of the solid-state light source, the positive input terminal of the comparator is connected to a preset voltage terminal, and the output terminal of the comparator is connected to the second terminal of the first switching transistor.

[0006] In some embodiments, the discharge circuit includes a second switch and a resistor; wherein, a first end of the resistor is connected to the output terminal of the driver and the positive electrode of the solid-state light source, and a second end of the resistor is connected to the second switch; a first end of the second switch is connected to the control terminal of the driver and the first end of the first switch, a second end of the second switch is connected to the second end of the resistor, and a third end of the second switch is connected to ground.

[0007] In some embodiments, the driver further includes an enable terminal; wherein, in response to an enable signal output by the enable terminal being at a first level and a control signal output by the control terminal being at a second level, the solid-state light source is turned on; in response to an enable signal output by the enable terminal being at the second level and a control signal output by the control terminal being at the first level, the solid-state light source is turned off.

[0008] In some embodiments, in response to the control signal output by the control terminal being in the first level state, the second switch is turned on, causing the discharge circuit to be in the first working state, thereby turning off the solid-state light source; in response to the control signal output by the control terminal being in the second level state, the second switch is not turned on, causing the discharge circuit to be in the second working state, thereby turning on the solid-state light source.

[0009] In some embodiments, in response to the output signal at the output terminal of the comparator being at a first level, the first switch is turned on; in response to the first switch being turned on, the control signal output by the control terminal is at a second level, thereby the second switch is not turned on, causing the discharge circuit to switch from the first operating state to the second operating state and the solid-state light source to turn off.

[0010] In some embodiments, in response to the output signal at the output terminal of the comparator being at the second level, the first switch is not turned on; in response to the first switch being not turned on and the control signal output by the control terminal being at the first level, the second switch is turned on, causing the discharge circuit to be in the first operating state; or in response to the first switch being not turned on and the control signal output by the control terminal being at the second level, the second switch is not turned on, causing the discharge circuit to be in the second operating state.

[0011] In some embodiments, the electrical signal of the solid-state light source includes a voltage signal; wherein, in response to the voltage value of the voltage signal being less than a preset value, the output signal of the comparator is in the first level state; in response to the voltage value of the voltage signal being greater than the preset value, the output signal of the comparator is in the second level state.

[0012] In some embodiments, the capacitor circuit includes a capacitor; wherein a first terminal of the capacitor is connected to the output terminal of the driver and the positive terminal of the solid-state light source, and a second terminal of the capacitor is connected to ground.

[0013] The second aspect of this application discloses an electronic device including the solid-state light source driving circuit described in the first aspect.

[0014] The beneficial effects of this application are as follows: The solid-state light source driving circuit includes a solid-state light source, a driver, a capacitor circuit, a discharge circuit, and a brightness maintenance circuit. One end of the brightness maintenance circuit is connected to the solid-state light source, and the other end is connected between the control terminal of the driver and the discharge circuit. The brightness maintenance circuit collects the electrical signal of the solid-state light source. The driver controls the discharge circuit to change its working state based on the change of the electrical signal of the solid-state light source, thereby maintaining the brightness of the solid-state light source. By controlling the discharge circuit to change its working state based on the change of the electrical signal of the solid-state light source, the capacitor circuit can still retain a certain amount of charge during the discharge process. Thus, when the solid-state light source is turned on again, it can quickly enter the light-emitting stage, ensuring color purity and brightness are not affected when the solid-state light source is switched. Attached Figure Description

[0015] The present application will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

[0016] Figure 1 This is a schematic diagram of the solid-state light source driving circuit according to an embodiment of this application;

[0017] Figure 2 This is a circuit diagram of a solid-state light source driving circuit according to an embodiment of this application;

[0018] Figure 3 This is a circuit diagram of a solid-state light source driving circuit according to an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. Detailed Implementation

[0020] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, "many" in this application means two or more. Moreover, the term "at least one" in this application means any combination of at least two of any one or more of a plurality of objects. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C. Furthermore, the terms "first," "second," and "third" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0022] When the light source driver circuit switches between RGB channels, if the light source of the previous color is turned off for too long, a weak light may remain in its optical path. This residual light will overlap with the light source of the next color, resulting in impure transition colors in the image and causing color crosstalk. To solve the color crosstalk problem, a discharge circuit can be set to forcibly discharge the residual charge of the energy storage capacitor at the back end of the LED driver, thereby accelerating the light source's shutdown process. However, in high-speed timing switching scenarios, the instantaneous driving current of the light source is insufficient, causing fluctuations or a decrease in the overall light output brightness. In other words, it is difficult to balance the switching time and the brightness display.

[0023] Therefore, this application proposes a solid-state light source driving circuit and electronic device to solve the above problems.

[0024] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Please see Figure 1 , Figure 1 This is a schematic diagram of the solid-state light source driving circuit according to an embodiment of this application. The solid-state light source driving circuit 100 includes a solid-state light source 110, a driver 120, a capacitor circuit 130, a discharge circuit 140, and a brightness maintenance circuit 150. Figure 1 As shown, the output terminal 1201 of the driver 120 is connected to the solid-state light source 110; the capacitor circuit 130 is connected between the output terminal 1201 of the driver 120 and the solid-state light source 110; the discharge circuit 140 and the capacitor circuit 130 are connected in parallel between the output terminal 1201 of the driver 120 and the solid-state light source 110, and are also connected to the control terminal 1202 of the driver 120; one end of the brightness maintenance circuit 150 is connected to the solid-state light source 110, and the other end is connected between the control terminal 1202 of the driver 120 and the discharge circuit 140.

[0026] The brightness maintenance circuit 150 collects electrical signals from the solid-state light source 110, which can be voltage signals, current signals, charges, etc. The operating states of the discharge circuit 140 include a first operating state and a second operating state. The first operating state indicates that the discharge circuit 140 performs a discharge operation, and the second operating state indicates that the discharge circuit 140 does not perform a discharge operation. Based on the electrical signals of the solid-state light source 110, the driver 120 controls the discharge circuit 140 to change its operating state through the electrical signals of the solid-state light source 110. For example, the discharge circuit 140 switches from the first operating state to the second operating state to maintain the brightness of the solid-state light source 110.

[0027] In some examples, the brightness maintenance circuit 150 continuously samples the electrical signal of the solid-state light source 110 and changes the output signal of the control terminal 1202 of the driver 120 according to the changes in the electrical signal of the solid-state light source 110. As a result, the driver 120 can control the discharge circuit 140 to change its working state. For example, during the stage when the solid-state light source 110 is off, the driver 120 controls the discharge circuit 140 to stop discharging at a preset node, so that the capacitor circuit 130 still retains a certain amount of charge. Thus, when the solid-state light source 110 lights up again, it can quickly enter the light-emitting stage.

[0028] In this embodiment, the solid-state light source driving circuit 100 includes a solid-state light source 110, a driver 120, a capacitor circuit 130, a discharge circuit 140, and a brightness maintenance circuit 150. The brightness maintenance circuit 150 is connected to the solid-state light source 110 and is connected between the control terminal 1202 of the driver 120 and the discharge circuit 140. The brightness maintenance circuit 150 collects the electrical signal of the solid-state light source 110. The driver 120 controls the discharge circuit 140 to change its working state based on the change of the electrical signal of the solid-state light source 110, thereby maintaining the brightness of the solid-state light source 110. By controlling the discharge circuit 140 to change its working state based on the change of the electrical signal of the solid-state light source 110, the capacitor circuit 130 can still retain a certain amount of charge during the discharge process. Therefore, when the solid-state light source 110 lights up again, it can quickly enter the light-emitting stage, thus ensuring color purity and brightness are not affected when the solid-state light source is switched.

[0029] In other words, in practical applications, by using the solid-state light source driving circuit 100 to switch between RGB three colors, the time it takes for the capacitor circuit 130 to charge until the solid-state light source 110 lights up can be shortened. As a result, the solid-state light source 110 can continuously work in high-brightness mode and has a good brightness display effect.

[0030] In some examples, the solid-state light source 110 can be a light-emitting diode (LED) used as the light source for a projection device; the driver 120 can be an LED constant current driver chip used to provide a stable constant current output, adapt to different input voltages and LED voltage requirements, and adjust LED brightness, etc. The output terminal 1201 of the driver 120 can be the voltage output pin VOUT (Voltage Output) of the LED constant current driver chip, and the control terminal 1202 of the driver 120 can be the switch driver pin SDRV (Switch Driver) of the LED constant current driver chip; the capacitor circuit 130 can be used for filtering, energy storage, etc., to optimize circuit performance; the discharge circuit 140 can be used to manage energy storage and release, ensuring circuit safety and stability.

[0031] In some embodiments, such as Figures 1-2 As shown, Figure 2 This is a circuit diagram of a solid-state light source driving circuit according to an embodiment of this application. The brightness maintenance circuit 150 includes a first switching transistor Q1 and a comparator CMP1.

[0032] The first terminal of the first switch Q1 is connected to the control terminal SDRV (i.e., the control terminal 1202 of the driver 120) and the discharge circuit 140. The second terminal of the first switch Q1 is connected to the comparator CMP1, and the third terminal of the first switch Q1 is connected to ground. The negative input terminal of the comparator CMP1 is connected to the positive terminal of the solid-state light source 110, the positive input terminal of the comparator CMP1 is connected to the preset voltage terminal V1 (Reference Voltage, VREF), and the output terminal of the comparator CMP1 is connected to the second terminal of the first switch Q1.

[0033] In some examples, the first switching transistor Q1 can be a bipolar transistor, such as an NPN transistor. Specifically, the collector of the first switching transistor Q1 is connected to the control terminal SDRV of the driver 120 and the discharge circuit 140; the base of the first switching transistor Q1 is connected to the comparator CMP1; and the emitter of the first switching transistor Q1 is connected to ground. The negative input terminal of the comparator CMP1 is connected to the positive terminal of the solid-state light source 110, the positive input terminal of the comparator CMP1 is connected to the preset voltage terminal V1, and the output terminal of the comparator CMP1 is connected to the base of the first switching transistor Q1.

[0034] In some embodiments, such as Figures 1-2 As shown, the discharge circuit 140 includes a second switch Q2 and a resistor R1.

[0035] The first end of resistor R1 is connected to the output terminal VOUT of driver 120 (i.e., the output terminal 1201 of driver 120) and the positive terminal of solid-state light source 110. The second end of resistor R1 is connected to the second switch Q2. The first end of the second switch Q2 is connected to the control terminal SDRV of driver 120 and the first end of the first switch Q1. The second end of the second switch Q2 is connected to the second end of resistor R1. The third end of the second switch Q2 is connected to ground.

[0036] In some examples, the second switch Q2 can be a metal-oxide-semiconductor field-effect transistor, such as an NMOS transistor. That is, the first end of resistor R1 is connected to the output terminal VOUT of driver 120 and the positive terminal of solid-state light source 110, and the second end of resistor R1 is connected to the second switch Q2; the gate of the second switch Q2 is connected to the control terminal SDRV of driver 120 and the collector of the first switch Q1, the drain of the second switch Q2 is connected to the second end of resistor R1, and the source of the second switch Q2 is connected to ground.

[0037] In some embodiments, such as Figure 2 As shown, the driver 120 also includes an enable pin EN, which can be the enable control pin EN (Enable) of the LED constant current driver chip.

[0038] Specifically, in response to the enable signal output by the enable terminal EN being in a first level state and the control signal output by the control terminal SDRV being in a second level state, the solid-state light source 110 is turned on; or in response to the enable signal output by the enable terminal EN being in a second level state and the control signal output by the control terminal SDRV being in a first level state, the solid-state light source 110 is turned off.

[0039] In some examples, the first level state is a high level state, and the second level state is a low level state. For example, if the enable signal output by the enable terminal EN is at a high level state, and the control signal output by the control terminal SDRV is at a low level state, then the solid-state light source 110 lights up, that is, the driver 120 normally drives the solid-state light source 110 to light up. For example, if the enable signal output by the enable terminal EN is at a low level state, and the control signal output by the control terminal SDRV is at a high level state, then the solid-state light source 110 is off, that is, the control terminal SDRV drives the discharge circuit 140 to work, and thus the solid-state light source 110 turns off.

[0040] In some embodiments, the control terminal SDRV of the driver 120 is connected to the first terminal of the second switch Q2, for example, the control terminal SDRV is connected to the gate of the second switch Q2.

[0041] In this case, in response to the control signal output by the control terminal SDRV being in the first level state, the second switch Q2 is turned on, causing the discharge circuit 140 to be in the first working state, and thus the solid-state light source 110 is turned off; in response to the control signal output by the control terminal SDRV being in the second level state, the second switch Q2 is not turned on, causing the discharge circuit 140 to be in the second working state, and thus the solid-state light source 110 is turned on.

[0042] For example, the first level state is a high level state, and the second level state is a low level state; the first operating state of the discharge circuit 140 can be that the discharge circuit 140 performs the discharge task until the solid-state light source 100 is turned off, and its second operating state can be that the discharge circuit 140 does not perform the discharge task. Specifically, if the control signal output by the control terminal SDRV is at a high level, the second switch Q2 is turned on, causing the discharge circuit 140 to be in the first operating state, that is, the second switch Q2 and the resistor R1 form a discharge circuit to discharge, thereby turning off the solid-state light source 110. If the control signal output by the control terminal SDRV is at a low level, the second switch Q2 is not turned on, causing the discharge circuit 140 to be in the second operating state, that is, the second switch Q2 and the resistor R1 do not form a discharge circuit to discharge, and thus the solid-state light source 110 lights up under the drive of the enable terminal EN.

[0043] In some embodiments, such as Figure 2 As shown, the control terminal SDRV of the driver 120 is also connected to the first terminal of the first switching transistor Q1, that is, the control terminal SDRV is connected to the collector of the first switching transistor Q1 and the gate of the second switching transistor Q2.

[0044] In response to the output signal of the comparator CMP1 being at the first level, the first switch Q1 is turned on; in response to the first switch Q1 being turned on, the control signal output by the control terminal SDRV is at the second level, and the second switch Q2 is turned off, so that the discharge circuit 140 switches from the first working state to the second working state and the solid-state light source 110 is turned off.

[0045] In some examples, the first operating state of the discharge circuit 140 may be that the discharge circuit 140 performs a discharge operation until the solid-state light source 110 is turned off, and the second operating state of the discharge circuit 140 may be that the discharge circuit 140 does not perform a discharge operation. For example, when the solid-state light source 110 is turned off, the discharge circuit 140 performs a discharge task. At this time, if the output signal of the comparator CMP1 is in a high-level state, the output signal drives the first switch Q1 to turn on. Furthermore, since the first switch Q1 is turned on, the control signal output by the control terminal SDRV is pulled down to a low-level state, and thus the second switch Q2 is not turned on, so that the discharge circuit 140 stops discharging and the solid-state light source 110 is turned off.

[0046] Furthermore, in some embodiments, in response to the output signal at the output terminal of comparator CMP1 being in a second level state, the first switch Q1 is not turned on; in response to the first switch Q1 being not turned on and the control signal output by the control terminal SDRV being in a first level state, the second switch Q2 is turned on, causing the discharge circuit 140 to be in a first operating state; or in response to the first switch Q1 being not turned on and the control signal output by the control terminal SDRV being in a second level state, the second switch Q2 is not turned on, causing the discharge circuit 140 to be in a second operating state.

[0047] For example, if the output signal of comparator CMP1 is low, it fails to drive the first switch Q1 to turn on. Furthermore, since the first switch Q1 is not turned on and the control signal output by the control terminal SDRV is high, the second switch Q2 turns on, causing the discharge circuit 140 to perform a discharge task. In this case, the solid-state light source 110 is in an off state. Alternatively, if the output signal of comparator CMP1 is low, it fails to drive the first switch Q1 to turn on. Furthermore, since the first switch Q1 is not turned on and the control signal output by the control terminal SDRV is low, the second switch Q2 does not turn on, causing the discharge circuit 140 not to perform a discharge task. In this case, the solid-state light source 110 can be in an on / off state.

[0048] In some embodiments, such as Figure 2 As shown, the capacitor circuit 130 includes a capacitor C1, wherein the first end of the capacitor C1 is connected to the output terminal VOUT of the driver 120 and the positive terminal of the solid-state light source 110, and the second end of the capacitor C1 is connected to ground.

[0049] In some embodiments, the electrical signal of the solid-state light source 110 includes a voltage signal; wherein, in response to the voltage value of the voltage signal being less than a preset value, the output signal of the comparator CMP1 is in a first level state; in response to the voltage value of the voltage signal being greater than the preset value, the output signal of the comparator CMP1 is in a second level state.

[0050] The brightness maintenance circuit 150 acquires the electrical signal from the solid-state light source 110. For example, the brightness maintenance circuit 150 continuously samples the positive voltage of the solid-state light source 110. Figure 2 As shown, this is also the voltage across capacitor C1.

[0051] In some examples, the driver 120 controls the operating state of the discharge circuit 140 by controlling the voltage of the solid-state light source 110 to maintain the brightness of the solid-state light source 110. For example, when the solid-state light source 110 is off, the control signal output by the control terminal SDRV is at a high level, the second switch is turned on, and the discharge circuit 140 performs the discharge task. At this time, the comparator CMP1 continuously samples the positive voltage of the solid-state light source 110. In response to the positive voltage being less than a preset value, the output signal of the comparator CMP1 is at a first level. That is, when the comparator CMP1 detects that the positive voltage is less than the preset voltage value, the output signal of its output terminal is at a high level. This output signal drives the first switch Q1 to turn on. Furthermore, since the first switch Q1 is turned on, the control signal output by the control terminal SDRV is pulled down to a low level, and the second switch Q2 is not turned on. This causes the discharge circuit 140 to stop discharging at the preset voltage value, so that the capacitor C1 still retains a certain amount of charge. Thus, when the solid-state light source 110 turns on again, it can quickly enter the light-emitting stage. Correspondingly, if the comparator CMP1 detects that the positive voltage is greater than the preset voltage value, its output signal will be at a low level, and the level of the control signal output by the control terminal SDRV will not change. For example, if the solid-state light source 110 is a red light, the preset voltage value can be 7.5V; if the solid-state light source 110 is a green light, the preset voltage value can be 10V.

[0052] It should be noted that the description of the solid-state light source driver circuit 100 in this document is for illustrative purposes only. Actual circuit design can be flexibly adjusted according to specific application scenarios (such as AC input type, power factor requirements, light source type, etc.). The driver 120, capacitor circuit 130, discharge circuit 140, and brightness maintenance circuit 150 may also include different auxiliary circuits, such as... Figure 3 As shown, Figure 3 This is a circuit diagram of a solid-state light source 110 driving circuit according to an embodiment of this application. For example, the driver 120 also includes pins such as VINA, UVLO, IADJ, COFF, GND, nFault, and HG. The capacitor circuit 130 also includes components such as R5, C6, C7, and C8. The brightness maintenance circuit 150 also includes components such as CL1, R6, R7, and RL3.

[0053] Please see Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device according to an embodiment of this application. The electronic device 400 includes the solid-state light source circuit 100 described above. The electronic device 400 can be an LED display screen, an LED projector, or other electronic devices.

[0054] The solid-state light source driving circuit 100 includes a solid-state light source 110, a driver 120, a capacitor circuit 130, a discharge circuit 140, and a brightness maintenance circuit 150. The output terminal 1201 of the driver 120 is connected to the solid-state light source 110. The capacitor circuit 130 is connected between the output terminal 1201 of the driver 120 and the solid-state light source 110. The discharge circuit 140 is connected in parallel with the capacitor circuit 130 between the output terminal 1201 of the driver 120 and the solid-state light source 110, and is also connected to the control terminal 1202 of the driver 120. The brightness maintenance circuit 150 is connected to the solid-state light source 110 and is also connected between the control terminal 1202 of the driver 120 and the discharge circuit 140. The driver 120 controls the discharge circuit 140 to switch from a first operating state to a second operating state via an electrical signal from the solid-state light source 110. This allows the capacitor circuit 130 to retain a certain amount of charge during the discharge process, enabling it to quickly enter the light-emitting stage when the solid-state light source 110 lights up again. This ensures that color purity and brightness are not affected when the solid-state light source switches.

[0055] In practical applications, when the electronic device 400 plays / projects, it switches between RGB three colors through the solid-state light source driving circuit 100, which shortens the time from when the capacitor circuit 130 charges to when the solid-state light source 110 lights up. As a result, the electronic device 400 can work continuously in high brightness mode and has a good display effect.

[0056] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0057] In the several embodiments provided in this application, it should be understood that the disclosed methods and related devices can be implemented in other ways. For example, the related device implementations described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication disconnection shown or discussed may be indirect coupling or communication disconnection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0058] Those skilled in the art will readily recognize that numerous modifications and variations can be made to the apparatus and method while maintaining the teachings of this application. Therefore, the above disclosure should be considered limited only by the scope of the appended claims.

Claims

1. A solid-state light source driving circuit, characterized in that, include: Solid-state light source; A driver, the output of which is connected to the solid-state light source; A capacitor circuit is connected between the output terminal of the driver and the solid-state light source; A discharge circuit is connected in parallel with the capacitor circuit between the output terminal of the driver and the solid-state light source, and is also connected to the control terminal of the driver. A brightness maintenance circuit, one end of which is connected to the solid-state light source, and the other end of which is connected between the control terminal of the driver and the discharge circuit; The brightness maintenance circuit acquires the electrical signal of the solid-state light source. Based on the electrical signal, the driver controls the discharge circuit to switch from a first operating state to a second operating state to maintain the brightness of the solid-state light source. The first operating state indicates that the discharge circuit performs a discharge operation, and the second operating state indicates that the discharge circuit does not perform a discharge operation.

2. The circuit according to claim 1, characterized in that, The brightness maintenance circuit includes a first switching transistor and a comparator; Wherein, the first terminal of the first switching transistor is connected to the control terminal of the driver and the discharge circuit, the second terminal of the first switching transistor is connected to the comparator, and the third terminal of the first switching transistor is connected to ground. The negative input terminal of the comparator is connected to the positive electrode of the solid-state light source, the positive input terminal of the comparator is connected to a preset voltage terminal, and the output terminal of the comparator is connected to the second terminal of the first switching transistor.

3. The circuit according to claim 2, characterized in that, The discharge circuit includes a second switching transistor and a resistor; Wherein, the first end of the resistor is connected to the output terminal of the driver and the positive electrode of the solid-state light source, and the second end of the resistor is connected to the second switching transistor; The first terminal of the second switch is connected to the control terminal of the driver and the first terminal of the first switch, the second terminal of the second switch is connected to the second terminal of the resistor, and the third terminal of the second switch is connected to ground.

4. The circuit according to claim 3, characterized in that, The driver also includes an enable terminal; In this case, the solid-state light source is illuminated in response to the enable signal output by the enable terminal being in a first level state and the control signal output by the control terminal being in a second level state. In response to the enable signal output by the enable terminal being in the second level state and the control signal output by the control terminal being in the first level state, the solid-state light source is turned off.

5. The circuit according to claim 4, characterized in that, In response to the control signal output by the control terminal being in the first level state, the second switch is turned on, causing the discharge circuit to be in the first working state, thereby turning off the solid-state light source; In response to the control signal output from the control terminal being in the second level state, the second switch is not turned on, causing the discharge circuit to be in the second working state, and thus the solid-state light source lights up.

6. The circuit according to claim 3, characterized in that, In response to the output signal at the output terminal of the comparator being at a first level, the first switch is turned on; In response to the first switch being turned on, the control signal output by the control terminal is in the second level state, thereby turning off the second switch, causing the discharge circuit to switch from the first working state to the second working state and the solid-state light source to turn off.

7. The circuit according to claim 6, characterized in that, When the output signal at the output terminal of the comparator is at the second level, the first switch is not turned on; In response to the first switch being off and the control signal output from the control terminal being at the first level, the second switch is then turned on, causing the discharge circuit to be in the first operating state; or In response to the first switch being off and the control signal output by the control terminal being at the second level, the second switch is also off, causing the discharge circuit to be in the second operating state.

8. The circuit according to claim 7, characterized in that, The electrical signal of the solid-state light source includes a voltage signal; Wherein, in response to the voltage value of the voltage signal being less than a preset value, the output signal of the comparator is in the first level state; In response to the voltage value of the voltage signal being greater than the preset value, the output signal at the output terminal of the comparator is in the second level state.

9. The circuit according to claim 1, characterized in that, The capacitor circuit includes a capacitor; The first end of the capacitor is connected to the output terminal of the driver and the positive terminal of the solid-state light source, and the second end of the capacitor is connected to ground.

10. An electronic device, characterized in that, Includes a solid-state light source driving circuit as described in any one of claims 1-9.

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