Light source driving circuit, light emitting module and display module

Abstract

The application provides a light source driving circuit, a light-emitting module and a display module. The light-emitting module comprises a plurality of lamps, and the light source driving circuit comprises a control circuit and a plurality of constant current circuits. The control ends of the plurality of constant current circuits are electrically connected with the control circuit respectively, and the output ends of the constant current circuits are used for being connected with the power ends of at least one lamp. The constant current circuit is used for outputting a first current. The control circuit is used for controlling the current value of the first current output by the constant current circuit. The application provides a light source driving circuit. A single driving chip is replaced by a plurality of low-cost and light constant current circuits, so that the plurality of constant current circuits drive a plurality of lamps of different colors to emit light. The application not only saves the occupied area of the circuit board, but also reduces the overall volume of the display screen.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a light source driving circuit, a light-emitting module, and a display module. Background Technology

[0002] AR glasses display screens come in various types, such as LCOS screens, LCD screens, and Micro-LED screens, each corresponding to a different light source driving method. LCOS screens are reflective displays, meaning that red, green, and blue light emitted from a light source is reflected by the LCOS panel before entering the user's eyes. Each frame of an LCOS display is divided into red, green, and blue images, displayed sequentially, with each color of light displayed individually. That is, when one color of light is emitting light, the other two colors are not. For an LCOS display to function properly, a driver chip is required. A single driver chip drives multiple LEDs of different colors to emit light in a sequential manner to achieve the display function of the AR glasses. However, the individual driver chip is located on a circuit board, occupying a large area and increasing the overall size of the LCOS screen, causing inconvenience for users. Summary of the Invention

[0003] The main objective of this invention is to provide a light source driving circuit, a light-emitting module, and a display module, which aims to save the area of ​​the driving board in the display module.

[0004] This invention proposes a light source driving circuit for use in a light-emitting module, the light-emitting module including multiple lamps, the light source driving circuit including: a control circuit; multiple constant current circuits, the controlled terminals of the multiple constant current circuits being electrically connected to the control circuit respectively; the output terminals of the constant current circuits being used to connect to the power supply terminals of at least one of the lamps; the constant current circuits being used to output a first current; the control circuit being used to control the current value of the first current output by the constant current circuits.

[0005] Optionally, among the plurality of constant current circuits, at least two of the controlled terminals of the constant current circuits are interconnected.

[0006] Optionally, the light source driving circuit further includes: multiple switching circuits, wherein the first conducting terminals of the multiple switching circuits are connected one-to-one with the power supply terminals of the multiple lamps; the switching circuits are connected in series in the path between the power supply terminal of the lamp electrically connected to its first conducting terminal and the output terminal of the constant current circuit connected to its second conducting terminal; and the control circuit is used to control the switching circuits to turn on / off the path between the corresponding power supply terminal of the lamp and the output terminal of the constant current circuit.

[0007] Optionally, among the plurality of switching circuits, at least two of the controlled terminals of the switching circuits are interconnected.

[0008] Optionally, the multiple constant current circuits include a first constant current circuit and a second constant current circuit, and the multiple switching circuits include a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, and a fifth switching circuit; the controlled terminals of the first and second constant current circuits are both electrically connected to the control circuit; the output terminal of the first constant current circuit is used to connect to the power supply terminals of the LED red light and the first LED green light; the output terminal of the second constant current circuit is used to connect to the power supply terminals of the LED blue light and the second LED green light; the controlled terminal of the first switching circuit is electrically connected to the control circuit; the first conducting terminal of the first switching circuit is connected to the power supply terminal of the LED red light; and the first switching circuit is connected in series in the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit. The controlled terminal of the second switching circuit is electrically connected to the control circuit, and the first conducting terminal of the second switching circuit is connected to the power supply terminal of the LED blue light. The second switching circuit is connected in series in the path between the power supply terminal of the LED blue light and the output terminal of the second constant current circuit. The controlled terminal of the third switching circuit is electrically connected to the control circuit, and the first conducting terminal of the third switching circuit is connected to the power supply terminal of the second LED green light. The third switching circuit is connected in series in the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit. The controlled terminal of the fourth switching circuit is electrically connected to the control circuit, and the first conducting terminal of the fourth switching circuit is connected to the power supply terminal of the first LED green light. The fourth switching circuit is connected in series in the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit.

[0009] Optionally, the control circuit is configured to receive an external trigger signal, and output a corresponding current configuration signal to the first constant current circuit and the second constant current circuit according to the external trigger signal, and output a corresponding switch signal to the first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit according to the external trigger signal; the first constant current circuit is configured to output a corresponding current to the LED red light or the first LED green light according to the current configuration signal, so as to provide driving current for the LED red light or the first LED green light; the second constant current circuit is configured to output a corresponding current to the LED blue light or the second LED green light according to the current configuration signal, so as to provide driving current for the LED blue light or the second LED green light. The green LED provides the driving current; the first switching circuit is used to turn on / off the path between the power supply terminal of the red LED and the output terminal of the first constant current circuit according to the switching signal; the second switching circuit is used to turn on / off the path between the power supply terminal of the blue LED and the output terminal of the second constant current circuit according to the switching signal; the third switching circuit is used to turn on / off the path between the power supply terminal of the second green LED and the output terminal of the second constant current circuit according to the switching signal; the fourth switching circuit is used to turn on / off the path between the power supply terminal of the first green LED and the output terminal of the first constant current circuit according to the switching signal.

[0010] The present invention also proposes a light-emitting module, including multiple lamps and a light source driving circuit as described above.

[0011] Optionally, the multiple lights include LED blue lights, LED red lights, and LED green lights.

[0012] Optionally, the number of LED green lights is multiple.

[0013] The present invention also proposes a display module, which includes the light-emitting module as described above.

[0014] This invention proposes a light source driving circuit for use in a light-emitting module. The light-emitting module includes multiple lamps, and the light source driving circuit includes a control circuit and multiple constant current circuits. The controlled terminals of the multiple constant current circuits are electrically connected to the control circuit, and the output terminals of the constant current circuits are connected to the power supply terminals of at least one lamp. The constant current circuits output a first current, and the control circuit controls the value of the first current output by the constant current circuits. This invention provides a light source driving circuit that replaces a single driving chip with multiple low-cost and lightweight constant current circuits, enabling multiple constant current circuits to drive multiple lamps of different colors. This not only saves the area occupied by the circuit board but also reduces the overall size of the display screen. In practical applications of multiple constant current circuits, the control circuit controls the multiple constant current circuits, causing the constant current circuits to output corresponding driving currents to the power supply terminals of multiple lamps, thus providing driving current for lamps of different colors. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a circuit flowchart of a light source driving circuit and a light-emitting module according to the present invention; Figure 2 This is a circuit flowchart of another embodiment of the light source driving circuit and light-emitting module of the present invention; Figure 3 This is a circuit flowchart of another embodiment of a light source driving circuit and a light-emitting module according to the present invention.

[0017] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0022] An LCOS display requires a driver chip to function properly. A single driver chip drives multiple LEDs of different colors to emit light in a sequential manner to enable the display function of AR glasses. However, since a single driver chip is located on a circuit board, it occupies a large area, increasing the overall size of the LCOS screen and causing inconvenience for users.

[0023] To overcome the above shortcomings, this invention proposes a light source driving circuit for use in a light-emitting module, wherein the light-emitting module includes multiple lamps, as shown in the figure. Figure 1 The light source driving circuit includes: Control circuit 10; Multiple constant current circuits 20 are provided, and the controlled terminals of the multiple constant current circuits 20 are respectively electrically connected to the control circuit 10; the output terminals of the constant current circuits 20 are used to connect to the power supply terminal of at least one of the lamps. The constant current circuit 20 is used to output the first current; The control circuit 10 is used to control the current value of the first current output of the constant current circuit 20.

[0024] Understandably, in existing technologies, multiple LEDs of different colors are driven by a driver chip to emit light in a sequential manner, thus achieving the display function of a screen. However, a single driver chip occupies a large area of ​​the circuit board, increasing the overall size of the screen and causing inconvenience to the user. To overcome these shortcomings, this invention proposes a light source driving circuit. By replacing a single driver chip with multiple constant current circuits 20, where the constant current circuits 20 are implemented using low-cost and lightweight power driver chips, multiple power driver chips drive multiple LEDs of different colors to emit light, saving the area occupied by the circuit board and reducing the overall size of the screen. In practical applications of multiple constant current circuits 20, the control circuit 10 controls the multiple constant current circuits 20, causing the constant current circuits 20 to output corresponding drive currents to the power supply terminals of multiple LEDs, thereby providing drive current for LEDs of different colors.

[0025] It's important to understand that each frame of an LCOS display is divided into red, green, and blue light sources, displayed sequentially, with each color light source displayed individually. In this embodiment, a light-emitting module is applied to the LCOS display. This module includes red LEDs, green LEDs, and red LEDs, which emit red, green, and blue light respectively. This light is reflected by the LCOS panel and enters the human eye, thus achieving the display effect of the LCOS display. Furthermore, the control circuit 10 has a memory for storing constant current source configuration information. By calling the constant current source configuration information from the memory, the control circuit 10 can control the output current. The constant current circuit 20 has multiple sets of current configuration values, enabling rapid switching of the output current. When the constant current circuit 20 receives a current configuration signal from the control circuit 10, it switches the current accordingly to output current to the red LEDs, green LEDs, and red LEDs, providing driving current for them. In practical applications, the control circuit 10 is used to receive external trigger signals and call the constant current source configuration information in the memory according to the external trigger signals. The control circuit 10 outputs the corresponding current configuration signal to the constant current circuit 20 according to the constant current source configuration information in the memory. The constant current circuit 20 switches the current configuration value according to the current configuration signal and outputs the corresponding current to the power supply terminals of the LED red light, the LED red light, and the LED green light to provide driving current for the LED red light, the LED red light, and the LED green light.

[0026] This invention proposes a light source driving circuit for use in a light-emitting module. The light-emitting module includes multiple lamps, and the light source driving circuit includes a control circuit 10 and multiple constant current circuits 20. The controlled terminals of the multiple constant current circuits 20 are electrically connected to the control circuit 10, and the output terminals of the constant current circuits 20 are connected to the power supply terminals of at least one lamp. The constant current circuits 20 output a first current, and the control circuit 10 controls the value of the first current output by the constant current circuits 20. This invention provides a light source driving circuit that replaces a single driving chip with multiple low-cost and lightweight constant current circuits 20, enabling multiple constant current circuits 20 to drive multiple lamps of different colors, thus saving circuit board space and reducing the overall size of the display screen. In practical applications of multiple constant current circuits 20, the control circuit 10 controls the multiple constant current circuits 20, causing the constant current circuits 20 to output corresponding driving currents to the power supply terminals of multiple lamps, providing driving current for lamps of different colors.

[0027] In one embodiment, reference is made to Figure 1 and Figure 2 Among the multiple constant current circuits 20, at least two of the controlled terminals of the constant current circuits 20 are interconnected.

[0028] It is understood that in this embodiment, the constant current circuit 20 includes a first constant current circuit 210 and a second constant current circuit 220. The controlled terminals of both the first and second constant current circuits 210 and 220 are connected to the control terminal of the control circuit 10, and are interconnected. In practical applications, the current configuration signal of the control circuit 10 is output to the first and second constant current circuits 210 and 220, respectively. The first constant current circuit 210 outputs a corresponding current to the power supply terminal of the connected LED according to the current configuration signal, and the second constant current circuit 220 outputs a corresponding current to the power supply terminal of the connected LED according to the current configuration signal. The current output by either the first or second constant current circuit 210 can be zero.

[0029] In one embodiment, reference is made to Figure 2 The light source driving circuit further includes: Multiple switching circuits 30 are provided, with their first conducting terminals connected one-to-one with the power supply terminals of multiple lamps. The switching circuits 30 are connected in series in the path between the power supply terminal of the lamp electrically connected to its first conducting terminal and the output terminal of the constant current circuit 20 connected to its second conducting terminal. The control circuit 10 is used to control the switching circuit 30 to turn on / off the path between the power supply terminal of the lamp and the output terminal of the constant current circuit 20.

[0030] It is understood that in this embodiment, the light source driving circuit also includes multiple switching circuits 30. Each switching circuit 30 is connected in series in the path between the power supply terminal of the LED lamp, which is electrically connected to its first conducting terminal, and the output terminal of the constant current circuit 20, which is connected to its corresponding second conducting terminal. In practical applications, when the control circuit 10 controls the switching circuit 30 to be disconnected, the path between the power supply terminal of the LED lamp and the output terminal of the constant current circuit 20 is open, the current output by the constant current circuit 20 cannot be output to the LED lamp, and the LED lamp is in a non-illuminating state with no current flowing through it. When the control circuit 10 controls the switching circuit 30 to be turned on, the path between the power supply terminal of the LED lamp and the output terminal of the constant current circuit 20 is closed, the current output by the constant current circuit 20 is output to the LED lamp, and the LED lamp is in an illuminating state with current flowing through it. This achieves the effect of the switching circuit 30 controlling the LED lamp to emit light.

[0031] In one embodiment, reference is made to Figure 2 and Figure 3 Among the plurality of switch circuits 30, at least two of the controlled terminals of the switch circuits 30 are interconnected.

[0032] It is understood that in this embodiment, the light-emitting module includes a first green LED and a second green LED, and the switching circuit 30 includes a third switching circuit 330 and a fourth switching circuit 340. The controlled terminals of both the third switching circuit 330 and the fourth switching circuit 340 are connected to the control terminal of the control circuit 10. The third switching circuit 330 is connected in series in the path between the power supply terminal of the second green LED and the output terminal of the second constant current circuit 220, and the fourth switching circuit 340 is connected in series in the path between the power supply terminal of the first green LED and the output terminal of the first constant current circuit 210. In practical applications, when the control circuit 10 simultaneously controls the third switch circuit 330 and the fourth switch to be off, the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit 210 is open, and the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit 220 is also open. At this time, no current flows through the first LED green light and the second LED green light, and the first LED green light and the second LED green light are in a non-lighting state. When the control circuit 10 simultaneously controls the third switch circuit 330 and the fourth switch to be on, the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit 210 is on, and the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit 220 is also on. At this time, current flows through the first LED green light and the second LED green light, and the first LED green light and the second LED green light are in a lighting state.

[0033] In one embodiment, reference is made to Figure 3 The multiple constant current circuits 20 include a first constant current circuit 210 and a second constant current circuit 220, and the multiple switching circuits 30 include a first switching circuit 310, a second switching circuit 320, a third switching circuit 330, a fourth switching circuit 340 and a fifth switching circuit 30. The controlled terminal of the first constant current circuit 210 and the controlled terminal of the second constant current circuit 220 are both electrically connected to the control circuit 10. The output terminal of the first constant current circuit 210 is used to connect to the power supply terminal of the LED red light and the power supply terminal of the first LED green light. The output terminal of the second constant current circuit 220 is used to connect to the power supply terminal of the LED blue light and the power supply terminal of the second LED green light. The controlled terminal of the first switching circuit 310 is electrically connected to the control circuit 10, the first conducting terminal of the first switching circuit 310 is connected to the power supply terminal of the LED red light, and the first switching circuit 310 is connected in series in the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit 210. The controlled terminal of the second switching circuit 320 is electrically connected to the control circuit 10, the first conducting terminal of the second switching circuit 320 is connected to the power supply terminal of the LED blue lamp, and the second switching circuit 320 is connected in series in the path between the power supply terminal of the LED blue lamp and the output terminal of the second constant current circuit 220. The controlled terminal of the third switch circuit 330 is electrically connected to the control circuit 10, the first conducting terminal of the third switch circuit 330 is connected to the power supply terminal of the second LED green light, and the third switch circuit 330 is connected in series in the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit 220. The controlled terminal of the fourth switch circuit 340 is electrically connected to the control circuit 10, the first conducting terminal of the fourth switch circuit 340 is connected to the power supply terminal of the first LED green light, and the fourth switch circuit 340 is connected in series in the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit 210.

[0034] The control circuit 10 is used to receive an external trigger signal, and output a corresponding current configuration signal to the first constant current circuit 210 and the second constant current circuit 220 according to the external trigger signal, and output a corresponding switch signal to the first switch circuit 310, the second switch circuit 320, the third switch circuit 330 and the fourth switch circuit 340 according to the external trigger signal. The first constant current circuit 210 is used to output a corresponding current to the LED red light or the first LED green light according to the current configuration signal, so as to provide driving current for the LED red light or the first LED green light. The second constant current circuit 220 is used to output a corresponding current to the LED blue light or the second LED green light according to the current configuration signal, so as to provide driving current for the LED blue light or the second LED green light.

[0035] The first switching circuit 310 is used to turn on / off the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit 210 according to the switching signal. The second switching circuit 320 is used to turn on / off the path between the power supply terminal of the LED blue lamp and the output terminal of the second constant current circuit 220 according to the switching signal; The third switching circuit 330 is used to turn on / off the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit 220 according to the switching signal. The fourth switching circuit 340 is used to turn on / off the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit 210 according to the switching signal.

[0036] It is understood that in this embodiment, the control circuit 10 is implemented using a control chip, which has a first enable pin EN1, a second enable pin EN2, a third enable pin EN3, and a fourth enable pin EN4. The first switching circuit 310 is implemented using a first MOSFET, the second switching circuit 320 using a second MOSFET, the third switching circuit 330 using a third MOSFET, and the fourth switching circuit 340 using a fourth MOSFET. The constant current circuit 20 is implemented using a constant current chip U1. In practical applications, the control chip outputs a corresponding current configuration signal to the first constant current circuit 210 and the second constant current circuit 220 through the second enable pin EN2, so that the first constant current circuit 210 outputs a corresponding current to the LED red light and the first LED green light to provide driving current for the LED red light and the first LED green light, and the second constant current circuit 220 outputs a corresponding current to the LED blue light and the second LED green light to provide driving current for the LED blue light and the second LED green light.

[0037] Example 1, Reference Figure 3 The control circuit 10 outputs a conduction signal to the first MOSFET through the first enable pin EN1. The first MOSFET conducts the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit 210, and the LED red light is in the lit state. The control circuit 10 outputs a disconnection signal to the first MOSFET through the first enable pin EN1. The first MOSFET disconnects the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit 210, and the LED red light is in the non-lit state.

[0038] Example 2, Reference Figure 3 The control circuit 10 outputs a conduction signal to the second MOSFET through the third enable pin EN3. The second MOSFET conducts the path between the power supply terminal of the LED blue light and the output terminal of the second constant current circuit 220, and the LED blue light is in the emitting state. The control circuit 10 outputs a disconnection signal to the second MOSFET through the third enable pin EN3. The second MOSFET disconnects the path between the power supply terminal of the LED blue light and the output terminal of the second constant current circuit 220, and the LED blue light is in the non-emitting state.

[0039] Example 3, Reference Figure 3The control circuit 10 outputs a conduction signal to the third and fourth MOSFETs via the fourth enable pin EN4. The third MOSFET conducts the path between the power supply terminal of the second green LED and the output terminal of the second constant current circuit 220. At the same time, the fourth MOSFET conducts the path between the power supply terminal of the first green LED and the output terminal of the first constant current circuit 210. At this time, both the first and second green LEDs are in the lit state. The control circuit 10 outputs a disconnect signal to the third and fourth MOSFETs via the fourth enable pin EN4. The third MOSFET disconnects the path between the power supply terminal of the second green LED and the output terminal of the second constant current circuit 220. At the same time, the fourth MOSFET disconnects the path between the power supply terminal of the first green LED and the output terminal of the first constant current circuit 210. At this time, both the first and second green LEDs are in the non-lit state.

[0040] The present invention also proposes a light-emitting module, including multiple lamps and a light source driving circuit as described above.

[0041] It is understood that the light-emitting module includes a light source driving circuit and multiple LEDs of different colors. The light source driving circuit outputs current to the multiple LEDs of different colors to drive them to emit light. In this embodiment, the light-emitting module is applied to an LCOS display screen. The light emitted by the multiple LEDs of different colors is reflected by the LCOS panel and enters the human eye, thus achieving the display effect of the LCOS display screen.

[0042] In one embodiment, the plurality of lights includes LED blue lights, LED red lights, and LED green lights.

[0043] It is understood that the light source driving circuit is used to output current to the LED red light, LED red light, and LED green light to drive them to emit light. In this embodiment, the light of the three colors of the LED red light, LED red light, and LED green light enters the human eye after being reflected by the LCOS panel, thus achieving the display effect of the LCOS display screen.

[0044] In one embodiment, the number of LED green lights is multiple.

[0045] It is understandable that, since the human eye is most sensitive to green light, increasing the number of green LEDs can improve the brightness of the image output on the LCOS display. In this embodiment, the green LEDs include a first green LED and a second green LED, and the switching circuit 30 includes a third switching circuit 330 and a fourth switching circuit 340. The controlled terminals of both the third switching circuit 330 and the fourth switching circuit 340 are connected to the control terminal of the control circuit 10. The third switching circuit 330 is connected in series in the path between the power supply terminal of the second green LED and the output terminal of the second constant current circuit 220, and the fourth switching circuit 340 is connected in series in the path between the power supply terminal of the first green LED and the output terminal of the first constant current circuit 210. When the control circuit 10 simultaneously controls the third switch circuit 330 and the fourth switch to be turned on, the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit 210 is in a conducting state, and the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit 220 is in a conducting state. At this time, current flows through the first LED green light and the second LED green light, and the first LED green light and the second LED green light are in a lit state.

[0046] The present invention also proposes a display module, which includes the light-emitting module as described above.

[0047] It is understood that in this embodiment, the display module is implemented using an LCOS display screen, which includes an LCOS panel and a light-emitting module. In practical applications, the light source driving circuit in the light-emitting module is used to output current to multiple LEDs of different colors to drive the multiple LEDs of different colors to emit light. The light emitted by the multiple LEDs of different colors is reflected by the LCOS panel and enters the human eye, thus achieving the display effect of the LCOS display screen.

[0048] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A light source driving circuit, applied to a light-emitting module, the light-emitting module comprising multiple lamps, characterized in that, The light source driving circuit includes: Control circuit; Multiple constant current circuits are provided, and the controlled terminals of the multiple constant current circuits are electrically connected to the control circuit respectively; the output terminals of the constant current circuits are used to connect to the power supply terminal of at least one of the lamps. The constant current circuit is used to output the first current; The control circuit is used to control the current value of the first current output by the constant current circuit; The light source driving circuit also includes: Multiple switching circuits are provided, with the first conducting terminal of each switching circuit connected to the power supply terminal of each lamp in a corresponding manner. The switching circuits are connected in series in the path between the power supply terminal of the lamp electrically connected to its first conducting terminal and the output terminal of the constant current circuit connected to its second conducting terminal. The control circuit is used to control the switching circuit to turn on / off the path between the power supply terminal of the lamp and the output terminal of the constant current circuit; The multiple constant current circuits include a first constant current circuit and a second constant current circuit, and the multiple switching circuits include a first switching circuit, a second switching circuit, a third switching circuit, and a fourth switching circuit; The controlled terminals of the first constant current circuit and the second constant current circuit are both electrically connected to the control circuit. The output terminal of the first constant current circuit is used to connect to the power supply terminal of the LED red light and the power supply terminal of the first LED green light. The output terminal of the second constant current circuit is used to connect to the power supply terminal of the LED blue light and the power supply terminal of the second LED green light. The controlled terminal of the first switching circuit is electrically connected to the control circuit, the first conducting terminal of the first switching circuit is connected to the power supply terminal of the LED red light, and the first switching circuit is connected in series in the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit. The controlled terminal of the second switching circuit is electrically connected to the control circuit, the first conducting terminal of the second switching circuit is connected to the power supply terminal of the LED blue lamp, and the second switching circuit is connected in series in the path between the power supply terminal of the LED blue lamp and the output terminal of the second constant current circuit. The controlled terminal of the third switching circuit is electrically connected to the control circuit, the first conducting terminal of the third switching circuit is connected to the power supply terminal of the second LED green light, and the third switching circuit is connected in series in the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit. The controlled terminal of the fourth switch circuit is electrically connected to the control circuit, the first conducting terminal of the fourth switch circuit is connected to the power supply terminal of the first LED green light, and the fourth switch circuit is connected in series in the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit.

2. The light source driving circuit as described in claim 1, characterized in that, In the plurality of constant current circuits, at least two of the controlled terminals of the constant current circuits are interconnected.

3. The light source driving circuit as described in claim 1, characterized in that, In the plurality of said switching circuits, at least two of the controlled terminals of the switching circuits are interconnected.

4. The light source driving circuit as described in claim 1, characterized in that, The control circuit is used to receive an external trigger signal, and output a corresponding current configuration signal to the first constant current circuit and the second constant current circuit according to the external trigger signal, and output a corresponding switch signal to the first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit according to the external trigger signal. The first constant current circuit is used to output a corresponding current to the LED red light or the first LED green light according to the current configuration signal, so as to provide driving current for the LED red light or the first LED green light; The second constant current circuit is used to output a corresponding current to the LED blue light or the second LED green light according to the current configuration signal, so as to provide driving current for the LED blue light or the second LED green light; The first switching circuit is used to turn on / off the path between the power supply terminal of the LED red light and the output terminal of the first constant current circuit according to the switching signal. The second switching circuit is used to turn on / off the path between the power supply terminal of the LED blue lamp and the output terminal of the second constant current circuit according to the switching signal; The third switching circuit is used to turn on / off the path between the power supply terminal of the second LED green light and the output terminal of the second constant current circuit according to the switching signal. The fourth switching circuit is used to turn on / off the path between the power supply terminal of the first LED green light and the output terminal of the first constant current circuit according to the switching signal.

5. A light-emitting module, characterized in that, It includes multiple lamps and a light source driving circuit as described in any one of claims 1-4.

6. A display module, characterized in that, The display module includes the light-emitting module as described in claim 5.

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