CN112444963B - Light source driving circuit and display module - Google Patents
Light source driving circuit and display module Download PDFInfo
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- CN112444963B CN112444963B CN201910815559.2A CN201910815559A CN112444963B CN 112444963 B CN112444963 B CN 112444963B CN 201910815559 A CN201910815559 A CN 201910815559A CN 112444963 B CN112444963 B CN 112444963B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/103—Scanning systems having movable or deformable optical fibres, light guides or waveguides as scanning elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Signal Processing (AREA)
- Semiconductor Lasers (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
The invention discloses a light source driving circuit and a display module, wherein the light source driving circuit comprises: a red light drive circuit, a green light drive circuit and a blue light drive circuit; each driving circuit comprises a driving power supply, a driving chip and a plurality of lasers with the same color; the driving chip comprises a plurality of current input ports; the lasers with the same color are connected in parallel, each current input port is connected with the negative electrode of one laser, and the positive electrodes of the lasers are connected with the driving power supply. The technical problem that the energy utilization rate is low is solved by the scheme, the high-power effective laser light power output can be obtained, and the light power utilization efficiency can be improved at the same time.
Description
Technical Field
The invention relates to the field of projection display, in particular to a light source driving circuit and a display module.
Background
The imaging principle of the fiber scanning display technology (FSD) is that a scanning optical fiber is driven by an optical fiber scanner to perform a motion of a predetermined two-dimensional scanning track, and light emitted from a light source is modulated, i.e., light corresponding to each pixel point of an image to be displayed is modulated, and then the light corresponding to each pixel point of the image to be displayed is projected onto a projection plane one by one through the scanning optical fiber, thereby forming a projection picture.
Lasers are often used as light sources for fiber scanning display technology due to the characteristics of high brightness, high directivity, high monochromaticity, high coherence and the like. In some scenarios where increased optical power is required, for example: in engineering projection and laser television, which are projection scenes requiring high brightness, a common method is to select a laser with a higher rated power and select a light source driving scheme with high-power driving capability.
Taking a laser as a semiconductor laser diode as an example, the power of the semiconductor laser diode is increased, which inevitably results in an increase in the area of the light exit. In the application of the optical fiber scanning display technology, in order to improve resolution and imaging quality, a smaller optical fiber light-emitting spot needs to be obtained, and correspondingly, an optical fiber section as thin as possible is also needed, which results in that when a high-power laser tube is directly used, because the light-emitting spot of a high-power laser is very large, the laser light-emitting spot is difficult to be shaped and coupled into a narrow optical fiber, and a laser spot as small as possible cannot be obtained.
It can be seen that, in the application of optic fibre scanning display technology, in order to promote the luminance of projecting image, directly promote the output of laser instrument, there is the lower problem of energy utilization, need for one kind among the prior art to obtain powerful effective laser luminous power output, promotes luminous power utilization efficiency simultaneously to reduce the light source scheme of heat dissipation design complexity and cost.
Disclosure of Invention
The invention aims to provide a light source driving circuit and a display module, which are used for solving the technical problem of low energy utilization rate in the prior art that the output power of a laser is directly improved in order to improve the brightness of a projected image in the application of an optical fiber scanning display technology, and the scheme can obtain high-power effective laser light power output and improve the light power utilization efficiency at the same time.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a light source driving circuit, including: the driving circuit comprises a red light driving circuit, a green light driving circuit and a blue light driving circuit;
each driving circuit comprises a driving power supply, a driving chip and a plurality of lasers with the same color; the driving chip comprises a plurality of current input ports; the lasers with the same color are connected in parallel, each current input port is connected with the negative electrode of one laser, and the positive electrodes of the lasers are connected with the driving power supply.
Optionally, the model of the driving chip is ISL58365.
Optionally, the driving chip includes 4 current input ports, and each of the driving circuits includes 2 to 4 lasers with the same color.
Optionally, each light source driving circuit includes an image driver and a micro control unit;
the micro control unit is used for configuring the threshold current of each laser;
the image driver is connected with the image data ports of the driving chips, and the image driver inputs image data corresponding to each driving chip through the image data ports;
the driving chip is used for calculating modulation current required by light corresponding to the image data emitted by each laser according to the image data, and controlling the current of each current input port driving the corresponding laser to be the superposed current of the threshold current of the laser and the modulation current.
A second aspect of an embodiment of the present invention provides a light source driving circuit, including: a red light driving power supply, a green light driving power supply and a blue light driving power supply;
a driving chip including a plurality of current input ports;
the red light source module comprises a plurality of red lasers connected in series, one end of the red light source module is connected with the red light driving power supply, and the other end of the red light source module is connected with the corresponding current input port;
the green light source module comprises a plurality of green lasers connected in series, one end of the green light source module is connected with the green light driving power supply, and the other end of the green light source module is connected with the corresponding current input port;
the blue light source module comprises a plurality of blue light lasers connected in series, one end of the blue light source module is connected with the blue light driving power supply, and the other end of the blue light source module is connected with the corresponding current input port.
Optionally, the model of the driving chip is ISL58365.
Optionally, the light source driving circuit includes an image driver and a micro control unit;
the micro control unit is used for configuring the threshold current of the red light source module, the green light source module and the blue light source module;
the image driver is connected with an image data port of the driving chip and inputs image data through the image data port;
the driving chip is used for calculating modulation current required by light corresponding to the image data emitted by each light source module according to the image data, and controlling the current of each current input port driving the corresponding light source module to be the superposed current of the threshold current and the modulation current of each light source module.
A third aspect of an embodiment of the present invention provides a display module, including the light source driving circuit and the optical fiber scanner described in the first and second aspects; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, one end of the optical fiber exceeds the actuator to form an optical fiber cantilever, the optical fiber cantilever is driven by the actuator to sweep in a three-dimensional space, light emitted by a laser in the light source driving circuit is coupled in from the other end of the optical fiber, and the light is scanned and output by the optical fiber scanner to serve as display image light.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the scheme of the embodiment of the invention, the light source driving circuit comprises a red light driving circuit, a green light driving circuit and a blue light driving circuit, wherein each driving circuit comprises a driving power supply, a driving chip and a plurality of lasers with the same color; the lasers with the same color are connected in parallel, so that the light power of the whole light source can be approximately overlapped in multiples, and the coupling efficiency of the lasers and the optical fiber can be ensured due to the fact that the light emitting facula of the low-power laser is small, so that the technical problem that the light source energy utilization rate is low due to the fact that the high-power effective laser light power output can be obtained and the light power utilization efficiency can be improved simultaneously in the scheme in the embodiment of the invention is solved, and the technical problem that in the prior art, in order to improve the brightness of a projected image, the output power of the lasers is directly improved, and the light power utilization efficiency is improved simultaneously is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:
FIG. 1 is a schematic diagram of a prior art laser driving scheme using a SL58365 chip;
fig. 2A-2C are schematic diagrams of a light source driving circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of another light source driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic view of a display module according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, a special laser driving chip scheme ISL58365 provided by Intersil corporation is selected as a laser driving scheme in optical fiber scanning display. As shown in fig. 1, ISL58365 is used as a special light source driving scheme, and has 4 independent current modulation driving ports inside, which can implement RGGB driving mode to complete white light modulation, and as shown in fig. 1, which is officially recommended, the ISL58365 chip is connected to a corresponding pin of a laser diode as a current input port, and only three current input ports, IOUT1, IOUT2 and IOUT3, are shown in the figure.
In the embodiment of the present invention, as shown in fig. 2A to fig. 2C, which are schematic structural diagrams of a light source driving circuit in the embodiment of the present invention, the light source driving circuit includes: the driving circuit comprises a red light driving circuit, a green light driving circuit and a blue light driving circuit; each driving circuit comprises a driving power supply, a driving chip and a plurality of lasers with the same color; the driving chip comprises a plurality of independent current input ports, and the number of the lasers is smaller than or equal to that of the current input ports; the lasers with the same color are connected in parallel, each current input port is connected with the negative electrode of one laser, and the positive electrodes of the lasers are connected with the driving power supply.
In the above scheme, a plurality of current input ports drive a plurality of lasers with the same color respectively, so that the lasers are overlapped in parallel. The laser may be a laser diode, and according to the number of laser diodes of the same color, the optical power of the whole system can be increased approximately by a multiple, for example: if the number of the laser diodes is N, the optical power of the whole system is approximately N times of the sum, and N is more than or equal to 2. Because the light-emitting facula of the low-power laser is less, the coupling efficiency of the laser and the optical fiber can be ensured, so that the high-power effective laser light power output can be obtained, and the light power utilization efficiency can be improved simultaneously, thereby solving the technical problem that the energy utilization ratio is lower because the output power of the laser is directly improved in order to improve the brightness of a projected image.
In the embodiment of the present invention, in order to implement modulation of white light, three paths of similar circuit modules are required to implement output of red light, green light and blue light respectively, and the specific circuit connection form is shown in fig. 2A-2C.
Fig. 2A is a schematic diagram of a red light driving circuit, where the red light driving circuit includes 3 red light lasers, cathodes of the 3 red light lasers are connected to the 3 current input ports IOUT1, IOUT2, and IOUT3, respectively, and an anode of the red light laser is connected to a red light driving power supply VCC _ R. Fig. 2B is a schematic diagram of the green light driving circuit, in which the cathodes of 3 green light lasers are connected to 3 current input ports IOUT1, IOUT2, and IOUT3, respectively, and the anodes of the green light lasers are connected to a green light driving power supply VCC _ G. Fig. 2C is a schematic diagram of the blue light driving circuit, the cathodes of the 3 blue light lasers are respectively connected to the 3 current input ports IOUT1, IOUT2 and IOUT3, and the anode of the blue light laser is connected to the blue light driving power supply VCC _ B.
In the embodiment of the present invention, according to actual requirements, the number of lasers with the same color in each driving circuit may be 2, 3, or 4, which is not limited in the present invention.
In the embodiment of the present invention, each light source driving circuit includes an image Driver (Video Driver) and a Micro Control Unit (MCU). The micro control unit is used for configuring the threshold current of each laser, the threshold current of the laser refers to the current of the laser tube which starts to generate laser oscillation, when the input current is small, the output power of the laser tube is basically not available, and when the input current increases to reach the threshold current, the output power of the laser tube increases along with the increase of the input current. The image driver is connected with an image data port D [9..0] of a driving chip, the image driver inputs corresponding image data to each driving chip through the image data port D [9..0], the driving chip is used for calculating modulation current required by each laser to emit light corresponding to the image data according to the image data, and the current of each current input port is controlled according to the threshold current and the modulation current, namely, the current of each current input port driving the corresponding laser is controlled to be the superposed current of the threshold current and the modulation current of the laser. In the embodiment of the invention, the micro control unit is also used for configuring parameters related to normal work of other driving chips.
Based on the same inventive concept, an embodiment of the present invention further provides a light source driving circuit, as shown in fig. 3, the light source driving circuit includes a red light driving power VCC _ R, a green light driving power VCC _ G, and a blue light driving power VCC _ B; a driver chip including a plurality of current input ports IOUT1, IOUT2, and IOUT3; the red light source module comprises a plurality of red lasers connected in series, one end of the red light source module is connected with the red light driving power supply VCC _ R, and the other end of the red light source module is connected with the corresponding current input port; the green light source module comprises a plurality of green lasers connected in series, one end of the green light source module is connected with the green light driving power supply VCC _ G, and the other end of the green light source module is connected with the corresponding current input port; blue light source module, including the blue light laser ware of a plurality of series connections, blue light source module one end with blue light drive power VCC _ B connects, and the other end is connected with the current input port who corresponds.
In the above scheme, the laser may be a laser diode, each current input port drives two or more laser diodes of the same color respectively, and the total light emitting power is doubled due to the current driving characteristic of the laser diodes. Meanwhile, the power of the laser is small, and the coupling efficiency of the light source and the optical fiber is high, so that the actual light output power of the optical fiber can be greatly increased.
In the embodiment of the present invention, the light source driving circuit includes an image Driver (Video Driver) and a Micro Control Unit (MCU), where the micro control Unit is configured to configure threshold currents of the red light source module, the green light source module, and the blue light source module; the image driver is connected with an image data port D [9..0] of the driving chip, the image data port D [9..0] is used for inputting image data, the driving chip is used for calculating modulation current required by light corresponding to the image data emitted by each light source module according to the image data, and controlling the current of the current input ports together according to the threshold current and the modulation current of each light source module, namely controlling the current of each current input port driving the corresponding light source module to be the superposed current of the threshold current and the modulation current of each light source module.
Specifically, the current for driving the red light source module is a superimposed current of the threshold current and the modulation current of the red light source module, the current for driving the green light source module is a superimposed current of the threshold current and the modulation current of the green light source module, and the current for driving the blue light source module is a superimposed current of the threshold current and the modulation current of the blue light source module.
In an embodiment of the present invention, a display module is further provided, as shown in fig. 4, which is a schematic diagram of the display module provided in the embodiment of the present invention, and includes a light source driving circuit 1, an optical fiber scanner 2, and a scanning driving circuit 3, where the optical fiber scanner 2 includes an actuator 21 and an optical fiber 22 fixed on the actuator 21, one end of the optical fiber 22 exceeds the actuator 21 to form an optical fiber suspension arm 220, the scanning driving circuit 3 is configured to provide a driving control signal to the actuator 21, the optical fiber suspension arm 220 is driven by the actuator 21 to scan in a three-dimensional space, light emitted from a laser in the light source driving circuit 1 is coupled in from the other end of the optical fiber 22, and is scanned and output by the optical fiber scanner 2 to serve as display image light. The light source driving circuit 1 may be any one of the embodiments shown in fig. 2A to fig. 3, which is not described herein again.
The display module in the embodiment of the invention can be applied to various projection display devices, such as: head-mounted AR (English full name: augmented Reality) equipment and head-mounted VR English full name: virtual Reality; chinese name: virtual reality) equipment, projection televisions, projectors, etc., in these projection display equipment, can use a display module to show, can also show through the mode that a plurality of display modules splice, and this the invention does not do the restriction.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
1. the small-power semiconductor laser tube has high optical fiber coupling efficiency, and can efficiently achieve high-power effective optical power output by using a plurality of semiconductor laser tubes of the same color for combined output, thereby providing an optical coupling effect and a light source utilization rate.
2. The scheme in the embodiment of the invention avoids using a single high-power laser diode, can effectively reduce the system heating, reduce the heat dissipation design difficulty and ensure the performance reliability of the semiconductor laser light source.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of steps disclosed.
Claims (6)
1. A light source driving circuit, comprising: the driving circuit comprises a red light driving circuit, a green light driving circuit and a blue light driving circuit; the light emitted by the red light drive circuit, the green light drive circuit and the blue light drive circuit is used as the light corresponding to each pixel point of the image to be displayed; the light corresponding to each pixel point emitted by the laser in the light source driving circuit is coupled into an optical fiber to be used as display image light;
each driving circuit comprises a driving power supply, a driving chip and a plurality of lasers with the same color; the driving chip comprises a plurality of current input ports; the lasers with the same color are connected in parallel, each current input port is connected with the cathode of one laser, and the anodes of the lasers are connected with the driving power supply;
each light source driving circuit comprises an image driver and a micro control unit;
the micro control unit is used for configuring the threshold current of each laser;
the image driver is connected with the image data ports of the driving chips and inputs image data corresponding to each driving chip through the image data ports;
the driving chip is used for calculating modulation current required by light corresponding to the image data emitted by each laser according to the image data, and controlling current of each current input port driving the corresponding laser to be superposition current of the threshold current and the modulation current.
2. The light source driving circuit according to claim 1, wherein the type of the driving chip is ISL58365.
3. The light source driving circuit according to claim 2, wherein the driving chip includes 4 current input ports, each of the driving circuits including 2 to 4 lasers of the same color.
4. A light source driving circuit, comprising: a red light driving power supply, a green light driving power supply and a blue light driving power supply;
a driver chip including a plurality of current input ports;
the red light source module comprises a plurality of red light lasers connected in series, one end of the red light source module is connected with the red light driving power supply, and the other end of the red light source module is connected with the corresponding current input port;
the green light source module comprises a plurality of green lasers connected in series, one end of the green light source module is connected with the green light driving power supply, and the other end of the green light source module is connected with the corresponding current input port;
the blue light source module comprises a plurality of blue lasers connected in series, one end of the blue light source module is connected with the blue light driving power supply, and the other end of the blue light source module is connected with the corresponding current input port;
the light emitted by the red light source module, the green light source module and the blue light source module is used as the light corresponding to each pixel point of the image to be displayed; the light corresponding to each pixel point emitted by the laser in the light source driving circuit is coupled into an optical fiber to be used as display image light;
the light source driving circuit comprises an image driver and a micro control unit;
the micro control unit is used for configuring the threshold current of the red light source module, the green light source module and the blue light source module;
the image driver is connected with an image data port of the driving chip, and the image driver inputs image data through the image data port;
the driving chip is used for calculating modulation current required by light corresponding to the image data emitted by each light source module according to the image data, and controlling the current of each current input port driving the corresponding light source module to be the superposed current of the threshold current and the modulation current of each light source module.
5. The light source driving circuit according to claim 4, wherein the type of the driving chip is ISL58365.
6. A display module comprising the light source driving circuit according to any one of claims 1 to 5 and a fiber scanner; the optical fiber scanner comprises an actuator and an optical fiber fixed on the actuator, wherein one end of the optical fiber exceeds the actuator to form an optical fiber cantilever, the optical fiber cantilever is driven by the actuator to sweep in a three-dimensional space, light emitted by a laser in the light source driving circuit is coupled in from the other end of the optical fiber, and the light is scanned and output by the optical fiber scanner and then is used as display image light.
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