Optical system and projection equipment

Abstract

The invention relates to the technical field of display, and discloses an optical system and projection equipment. According to the optical system, in a frame image period, a driving unit is adopted to drive a modulation unit to deflect or move for multiple times, so that various colored lights modulated by the modulation unit are emitted into a light projection device at different incident angles, and then pixels in a projection picture projected by the light projection device are shifted; pixels of a projection picture when the projection equipment projects a frame of image can be increased, so that the resolution of the projection equipment is improved; the driving unit and the modulation unit are packaged into the integrated light projection device, and the driving unit can directly drive the modulation unit to deflect or move while the modulation unit modulates polychromatic light generated by the light source device, that is, when the resolution of the projection device is improved, other elements do not need to be additionally arranged, the light path is simple, and the cost is low. Therefore, the size of the projection device and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to an optical system and a projection device. Background Art

[0002] With the continuous improvement of display technology, large-size, high-resolution display devices (such as LCDs and projection devices) are increasingly used; however, regardless of the type of display device, due to the physical limitations of the display medium, resolution improvement has gradually become one of the bottlenecks of display devices.

[0003] At present, the commonly used solution to improve the resolution of projection equipment is to develop a smaller DMD chip at a high cost, but the latest DMD size has reached 5.4um. It is very difficult to make a smaller DMD, and the diffraction effect of light will be more obvious. The second is to use multiple DMD chips for splicing display to improve the resolution, but it is difficult to synchronize the signals between the chips. The resolution can also be improved by galvanometer dithering, but because the working principle of the galvanometer is to refract the light between the reflected light of the DMD and the projection lens to improve the resolution, a mechanical flip device needs to be installed between the lens and the DMD to drive the galvanometer to flip according to a certain rule, and generally electromagnetic force is used to drive the galvanometer to flip. The delay of the electromagnetic force and the inertia of the mechanical flip cause the galvanometer flip cycle to be too long, and the picture effect of the galvanometer dithering will have a smear, the edge of the image is not clear, and the picture quality is not ideal.

[0004] Therefore, how to improve the resolution of projection equipment is an urgent problem to be solved. Summary of the invention

[0005] The present application provides an optical system that can be used in a projection device and can improve the resolution of the projection device.

[0006] In a first aspect, the present application provides an optical system, the optical system comprising a light source device, a light modulation device and a light projection device, the light modulation device comprising a modulation unit and a driving unit;

[0007] A light source device, used for sequentially emitting a plurality of color lights within a primary color cycle;

[0008] A modulation unit, used for modulating the multiple color lights emitted by the light source device;

[0009] A driving unit, used for driving the modulation unit to move or deflect multiple times within one frame of an image cycle, so that the multiple color lights modulated by the modulation unit are incident on the light projection device at different incident angles;

[0010] A light projection device, used for receiving modulated multiple color lights and projecting them into a projection picture;

[0011] Among them, one frame image period corresponds to multiple primary color periods, each primary color period corresponds to an emission angle and a projection screen, and the distance between corresponding pixels in the projection screen corresponding to two adjacent primary color periods is a preset distance.

[0012] In some embodiments, the driving unit includes a driving substrate and a driving circuit board, the driving substrate and the driving circuit board are elastically connected, a plurality of electrodes are arranged on the driving circuit board, and the modulation unit and the driving substrate are insulated and connected;

[0013] A driving circuit board, used for applying a phase-complementary alternating voltage to any two electrodes in symmetrical positions among the plurality of electrodes;

[0014] The driving substrate is used to interact with two electrodes applying alternating voltages with complementary phases when a first preset voltage is applied, and drive the modulation unit to deflect a target angle along a first axis of the modulation unit, where the first axis corresponds to an axis of symmetry of the two electrodes.

[0015] In some embodiments, the driving circuit board is further used to apply complementary alternating voltages to two electrodes in symmetrical positions in each pair of the multiple electrodes, and the alternating voltage applied to any electrode is complementary in phase to one of the two adjacent electrodes and has the same phase as the other;

[0016] The driving substrate is also used to interact with multiple electrodes that apply alternating voltages with complementary phases when a first preset voltage is applied, so as to drive the modulation unit to deflect a target angle along a second axis of the modulation unit, wherein the second axis corresponds to the target axis of the multiple electrodes, and the alternating voltages applied by the electrodes on the same side of the target axis have the same phase, while the alternating voltages applied by the electrodes on different sides of the target axis have opposite phases.

[0017] In some embodiments, the distance between the driving substrate and the driving circuit board is a target distance, the amplitude difference of the phase-complementary alternating voltages is a target amplitude difference, and the physical size of any electrode among the plurality of electrodes is a target size;

[0018] When the first preset voltage is applied to the driving substrate, it interacts with the two electrodes applying the alternating voltage with complementary phases to generate two electrostatic forces, wherein the magnitude of any electrostatic force is determined according to the target distance, the target amplitude difference, the target size and the relative dielectric constant of the dielectric material of the driving substrate and the electrode.

[0019] In some embodiments, the driving unit includes a driving circuit board and a plurality of driving modules, each driving module includes a driving substrate and an elastic bracket connected to each other, each elastic bracket is connected to each side of the modulation unit through a connecting shaft, and a plurality of electrodes corresponding to the plurality of driving modules are arranged on the driving circuit board;

[0020] A driving circuit board, used for applying an alternating voltage with complementary phases to any pair of two electrodes in symmetrical positions;

[0021] The two driving modules corresponding to the two electrodes are used to cause the driving substrates in the two driving modules to interact with the two electrodes when a second preset voltage is applied, so that the elastic brackets in the two driving modules are deformed in a target direction, thereby driving the modulation unit to move a target distance in the target direction.

[0022] In some embodiments, the modulation unit and the driving circuit board are quadrilaterals, and four electrodes or eight electrodes are arranged on the driving circuit board, and the four electrodes are respectively located at the midpoints of the sides of the driving circuit board, or four of the eight electrodes are respectively located at the midpoints of the four sides of the driving circuit board, and the other four electrodes are respectively located at the four corners of the driving circuit board;

[0023] The driving unit includes four or eight driving modules, the four driving modules are respectively connected to the midpoints of the sides of the modulation unit, or four of the eight driving modules are respectively connected to the midpoints of the four sides of the modulation unit, and the other four driving modules are respectively connected to the four corners of the modulation unit.

[0024] In some embodiments, a plurality of driving circuits corresponding to the plurality of electrodes are disposed on the driving circuit board;

[0025] A plurality of driving circuits are used to apply alternating voltages to a plurality of electrodes under the control of an enable signal.

[0026] In some embodiments, the driving substrate and the driving circuit board are quadrilaterals, four electrodes and corresponding four driving circuits are arranged on the driving circuit board, the four electrodes include a first electrode, a second electrode, a third electrode and a fourth electrode, each electrode is located at the midpoint of each side of the driving circuit board, the first electrode and the third electrode are in a symmetrical position, the second electrode and the fourth electrode are in a symmetrical position, the four driving circuits include a first driving circuit, a second driving circuit, a third driving circuit and a fourth driving circuit, and the enable signal includes a first enable signal and a second enable signal;

[0027] The first driving circuit and the third driving circuit are used to apply complementary alternating voltages on the first electrode and the third electrode respectively when the first enable signal is in a target state;

[0028] The second driving circuit and the fourth driving circuit are used to apply alternating voltages with complementary phases to the second electrode and the fourth electrode respectively when the second enable signal is in a target state;

[0029] Among them, when the first enable signal and the second enable signal are in the target state at the same time, the alternating voltage applied to the first electrode has the same phase as the alternating voltage applied to the second electrode and is complementary in phase to the alternating voltage applied to the fourth electrode, or has a complementary phase to the alternating voltage applied to the second electrode and the same phase as the alternating voltage applied to the fourth electrode.

[0030] In some embodiments, the driving unit is connected to the modulation unit via a connecting member, and the driving unit includes a driving circuit board and a plurality of deformable material blocks;

[0031] A driving circuit board, used for applying a phase-complementary alternating voltage to any two deformable material blocks at symmetrical positions among the plurality of deformable material blocks;

[0032] Two deformable material blocks; used to deform in opposite directions under the action of phase-complementary alternating voltages to drive the modulation unit to deflect a target angle along a third axis of the modulation unit, and the third axis corresponds to the symmetry axis of the two deformable material blocks.

[0033] In a second aspect, the present application provides a projection device, comprising an optical system as described in any one of the first aspect and possible implementations of the first aspect.

[0034] The present application uses a driving unit to drive a modulation unit to deflect or move multiple times within a frame of an image cycle, so that the multiple color lights modulated by the modulation unit enter the light projection device at different incident angles, thereby causing the pixels in the projection picture projected by the light projection device to shift, which can increase the pixels of the projection picture when the projection device projects a frame of an image, thereby improving the resolution of the projection device; and the driving unit and the modulation unit are packaged into an integrated light projection device. While the modulation unit modulates the multi-color light generated by the light source device, the driving unit can directly drive the modulation unit to deflect or move, that is, when realizing the improvement of the resolution of the projection device, no other external components are required, and the optical path is simple, so the size of the projection device can be reduced and the cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other purposes, features and advantages of the present application will become more apparent by describing the embodiments of the present application in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps. Among them:

[0036] Figure 1 is a schematic diagram of the offset of the modulation unit in one embodiment of the present application;

[0037] Figure 2is a schematic structural diagram of a light projection device in one embodiment of the present application;

[0038] Figure 3 is a schematic diagram of a driving circuit in an embodiment of the present application;

[0039] Figure 4 is a schematic diagram of control logic in one embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the force of the metal substrate in one embodiment of the present application;

[0041] Figure 6 A schematic diagram of the force on the metal substrate in another embodiment of the present application

[0042] Figure 7 It is a partial structural schematic diagram of a light projection device in another embodiment of the present application;

[0043] Figure 8 A partial structural schematic diagram of a light modulation device in one embodiment of the present application; Fig. 9 Schematic diagram of functional modules of a projection device in one embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should belong to the scope of protection of the present application. In addition, although the disclosure in the present application is introduced according to one or several exemplary examples, it should be understood that each aspect of these disclosures can also constitute a complete technical solution separately. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] In the embodiments of the present application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0046] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. "First", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish descriptions. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The term "and / or" includes any and all combinations of one or more associated listed items.

[0047] In order to thoroughly understand the present application, a detailed description will be provided below to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0048] The present embodiment provides an optical system, which includes a light source device, a light modulation device and a light projection device, the light modulation device includes a modulation unit and a driving unit; the light source device is used to emit a plurality of color lights in a time sequence within a primary color cycle; the modulation unit is used to modulate the plurality of color lights emitted by the light source device; the driving unit is used to drive the modulation unit to move or deflect multiple times within a frame image cycle, so that the plurality of color lights modulated by the modulation unit enter the light projection device at different incident angles; the light projection device is used to receive the modulated plurality of color lights and project them into a projection picture.

[0049] Among them, one frame image period corresponds to multiple primary color periods, each primary color period corresponds to an emission angle and a projection screen, and the distance between the corresponding pixels in the projection screen corresponding to two adjacent primary color periods is the preset distance. The preset distance can be customized according to the actual application situation, for example, it can be a distance of half a pixel. Optionally, the incident angle can be determined according to the preset distance. There is no restriction on the light source device, which may include a light source (such as a laser light source, an LED light source, etc.), a light combining element, a filter element, a light homogenizing element, etc. There is no restriction on the multiple color lights, for example, it can be three primary colors of red, green and blue, or it can be red, yellow, green, cyan, etc. The primary color period can refer to the time required for the light source device to completely emit multiple color lights once. One frame image period can refer to the time required for the projection device to display a complete frame of the image; for example, assuming that the frame rate of the projection device is 60HZ, one frame image period is about 16.67ms. The light projection device can be a projection lens, including a variety of lenses with different curvature parameters.

[0050] For example, if Figure 1 , which is a schematic diagram of the deflection of the modulation unit provided in this embodiment; Figure 1The solid lines in the figure show the original position of the modulation unit when it is not deflected, as well as the main light rays of the incident light (i.e., the multiple color lights emitted by the light source device) and the initial emitted light (multiple color lights after modulation), and the dotted lines show the positions of the two modulation units after deflection, as well as the main light rays of the emitted light, and the target angle of deflection is α. It can be understood that the incident angle of the emitted light incident on the light projection device is related to the target angle α of the deflection of the modulation unit, and the incident angle of the light incident on the light projection device affects the position of the projection of the projection picture, so the incident angle and the target angle α of the deflection are related to the preset distance.

[0051] In some embodiments, the driving unit includes a driving substrate and a driving circuit board, the driving substrate and the driving circuit board are elastically connected, a plurality of electrodes are arranged on the driving circuit board, and the modulation unit and the driving substrate are insulated. The modulation unit may be a spatial light modulator, such as a DMD chip; the driving substrate may be formed of a conductive material, such as a metal substrate; an insulating layer may be arranged between the modulation unit and the metal substrate, and the insulating layer may be formed of an insulating material. The driving substrate and the driving circuit board may be connected by an elastic bracket, such as an elastic metal bracket.

[0052] A driving circuit board is used to apply a phase-complementary alternating voltage to any two electrodes in a symmetrical position among a plurality of electrodes; a driving substrate is used to interact with the two electrodes applying the phase-complementary alternating voltage when applying a first preset voltage, and drive the modulation unit to deflect a target angle along the first axis of the modulation unit, and the first axis corresponds to the symmetry axis of the two electrodes. The target angle is determined according to the incident angle or the preset distance. There is no restriction on the first preset voltage, and the amplitude of the first preset voltage V0 can be constant, for example, it can be V0=50V. The first axis is not limited. For example, if the modulation unit and the driving circuit board are both rectangular, and the electrodes are arranged at the midpoint position of each side of the driving circuit board, the first axis can be the two symmetry axes (Axis0 and Axis1) of the modulation unit.

[0053] Optionally, a plurality of driving circuits corresponding to the plurality of electrodes are provided on the driving circuit board; the plurality of driving circuits are used to apply alternating voltages to the plurality of electrodes under the control of an enable signal.

[0054] Optionally, the driving substrate and the driving circuit board are quadrilaterals, four electrodes and corresponding four driving circuits are arranged on the driving circuit board, the four electrodes include a first electrode, a second electrode, a third electrode and a fourth electrode, each electrode is located at the midpoint of each side of the driving circuit board, the first electrode and the third electrode are in symmetrical positions, the second electrode and the fourth electrode are in symmetrical positions, the four driving circuits include a first driving circuit, a second driving circuit, a third driving circuit and a fourth driving circuit, and the enable signal includes a first enable signal and a second enable signal;

[0055] The first driving circuit and the third driving circuit are used to apply complementary alternating voltages on the first electrode and the third electrode respectively when the first enable signal is in a target state; the second driving circuit and the fourth driving circuit are used to apply complementary alternating voltages on the second electrode and the fourth electrode respectively when the second enable signal is in a target state. The target state may refer to the value of the first enable signal or the second enable signal being 1 or 0.

[0056] For example, if Figure 2 As shown, it is a schematic diagram of the structure of an optical modulation device provided in this embodiment; in the optical modulation device, the modulation unit 01 is a DMD chip, an insulating layer 02 is provided between the modulation unit 01 and the metal substrate 03, and a plurality of electrodes 04 are provided on a driving circuit board 05 (in order to facilitate understanding, the plurality of electrodes 04 and the driving circuit board 05 are shown separately in the figure), and are connected to a plurality of driving circuits on the driving circuit board 05. The plurality of electrodes 04 include a first electrode 041, a second electrode 042, a third electrode 043 and a fourth electrode 044, and the corresponding plurality of driving circuits include a first driving circuit 051, a second driving circuit 052, a third driving circuit 053 and a fourth driving circuit 054. Figure 3 As shown, the first driving circuit 051 and the third driving circuit 053 turn on the first enable signal EN1, and the second driving circuit 052 and the fourth driving circuit 054 turn on the second enable signal EN2. Figure 3 V1 and V2 are alternating voltages with complementary phases.

[0057] Figure 4 Schematic diagram of the control logic of the optical system provided in this embodiment. Figure 4 As shown, VSYNC represents the vertical synchronization signal (frame rate). Assuming the frame rate is 60HZ, one frame image period (about 16.67ms) corresponds to 4 primary color periods (Subfram), the modulation unit can deflect 4 times, and the light source device emits blue B, red R, and green G three-color light (RGB Timing) according to the primary color period timing. A first preset voltage V0 = 50V is applied to the metal substrate 03; after receiving the pulse signal of VSYNC:

[0058] In the first primary color cycle, the first enable signal EN1 is 1, and the second enable signal EN2 is 0; the first drive circuit 051 is connected to V1, and the third drive circuit 053 is connected to V2, so that V1 is applied to the first electrode 041, and V2 is applied to the third electrode 043, V1 = -50V, V2 = +50V; Figure 5As shown in (a), an electrostatic force as shown in F1 is generated in the area corresponding to the first electrode 041 on the metal substrate, and an electrostatic force as shown in F3 is generated in the area corresponding to the third electrode 043. The directions of the forces F1 and F3 are opposite; the metal substrate is insulated and connected to the modulation unit, thereby driving the modulation unit along Figure 5 The first axis (Axis0) shown in (a) is deflected by the target angle, and the direction of the deflection is the direction of the force F1.

[0059] In the second primary color cycle, the first enable signal EN1 is 0, and the second enable signal EN2 is 1; the second driving circuit 052 is connected to V1, and the fourth driving circuit 054 is connected to V2, so that V1 is applied to the second electrode 042, and V2 is applied to the fourth electrode 044, V1 = -50V, V2 = +50V, and the directions of the forces of F2 and F4 are opposite; Figure 5 As shown in (b), the area corresponding to the second electrode 042 on the metal substrate generates an electrostatic force as shown by F2, and the area corresponding to the fourth electrode 044 generates an electrostatic force as shown by F4; thereby driving the modulation unit along Figure 5 The first axis (Axis1) shown in (b) is deflected by the target angle, and the direction of deflection is the direction of the force F2.

[0060] In the third primary color cycle, the first enable signal EN1 is 1, and the second enable signal EN2 is 0; the first drive circuit 051 is connected to V1, and the third drive circuit 053 is connected to V2, so that V1 is applied to the first electrode 041, and V2 is applied to the third electrode 043, V1 = +50V, V2 = -50V; Figure 5 As shown in (c), the area corresponding to the first electrode 041 on the metal substrate generates an electrostatic force as shown in F1, and the area corresponding to the third electrode 043 generates an electrostatic force as shown in F3; thereby driving the modulation unit along Figure 5 The first axis (Axis0) shown in (a) is deflected by the target angle, and the direction of deflection is the direction of the force F3.

[0061] In the fourth primary color cycle, the first enable signal EN1 is 0, and the second enable signal EN2 is 1; the second driving circuit 052 is connected to V1, and the fourth driving circuit 054 is connected to V2, so that V1 is applied to the second electrode 042, and V2 is applied to the fourth electrode 044, V1 = +50V, V2 = -50V; Figure 5 As shown in (d), the area corresponding to the second electrode 042 on the metal substrate generates an electrostatic force as shown by F2, and the area corresponding to the fourth electrode 044 generates an electrostatic force as shown by F4; thereby driving the modulation unit along Figure 5 The first axis (Axis1) shown in (d) is deflected by the target angle, and the direction of deflection is the direction of the force of F4.

[0062] It should be understood that the order from the first primary color period to the fourth primary color period is merely an example and does not constitute a limitation.

[0063] Optionally, the driving circuit board is also used to apply a phase-complementary alternating voltage to two electrodes in each pair of symmetrical positions among the multiple electrodes, and the alternating voltage applied by any electrode is complementary to one of the two adjacent electrodes and has the same phase as the other; the driving substrate is also used to interact with the multiple electrodes applying the phase-complementary alternating voltage when applying the first preset voltage, and drive the modulation unit to deflect the target angle along the second axis of the modulation unit, the second axis corresponds to the target axis of the multiple electrodes, the alternating voltages applied by the electrodes on the same side of the target axis have the same phase, and the alternating voltages applied by the electrodes on different sides of the target axis have opposite phases. The second axis is not limited. For example, if the modulation unit and the driving circuit board are both rectangular, and the electrodes are arranged at the midpoint position of each side of the driving circuit board, the second axis can be the two diagonals (Axis2 and Axis3) of the modulation unit.

[0064] Among them, when the first enable signal and the second enable signal are in the target state at the same time, the alternating voltage applied to the first electrode has the same phase as the alternating voltage applied to the second electrode and is complementary in phase to the alternating voltage applied to the fourth electrode, or has a complementary phase to the alternating voltage applied to the second electrode and the same phase as the alternating voltage applied to the fourth electrode.

[0065] For example, if Figure 2 In the optical system shown, assuming that one frame image period corresponds to 8 primary color periods, the modulation unit can be deflected 8 times. A first preset voltage V0 = 50V is applied to the metal substrate 03; when a VSYNC pulse signal is received:

[0066] In the first primary color cycle, please refer to the above Figure 4 The first primary color cycle is shown.

[0067] In the second primary color cycle, the first enable signal EN1 and the second enable signal EN2 are both 1; the first drive circuit 051 is connected to V1, the third drive circuit 053 is connected to V2, the second drive circuit 052 is connected to V3, and the fourth drive circuit 054 is connected to V4, so that V1, V3, V2 and V4 are applied to the first electrode 041, the second electrode 042, the third electrode 043 and the fourth electrode 044 respectively, V1 = V3 = -50V, V2 = V4 = +50V; Figure 6As shown in (a), the area corresponding to the first electrode 041 on the metal substrate generates an electrostatic force as shown by F1, the area corresponding to the second electrode 042 generates an electrostatic force as shown by F2, the area corresponding to the third electrode 043 generates an electrostatic force as shown by F3, and the area corresponding to the fourth electrode 044 generates an electrostatic force as shown by F4; the directions of the forces F1 and F4 are opposite, and the direction of the force F2 is the same; thereby driving the modulation unit along Figure 6 The second axis (Axis2) shown in (a) is deflected by the target angle, and the direction of the deflection is the direction of the resultant force of F1 and F2.

[0068] In the third primary color cycle, please refer to the above Figure 4 The third primary color cycle is shown.

[0069] In the fourth primary color cycle, the first enable signal EN1 and the second enable signal EN2 are both 1; the first drive circuit 051 is connected to V1, the third drive circuit 053 is connected to V2, the second drive circuit 052 is connected to V3, and the fourth drive circuit 054 is connected to V4, so that V1, V3, V2 and V4 are applied to the first electrode 041, the second electrode 042, the third electrode 043 and the fourth electrode 044 respectively, V1 = V4 = +50V, V2 = V3 = -50V; Figure 6 As shown in (b), the area corresponding to the first electrode 041 on the metal substrate generates an electrostatic force as shown by F1, the area corresponding to the second electrode 042 generates an electrostatic force as shown by F2, the area corresponding to the third electrode 043 generates an electrostatic force as shown by F3, and the area corresponding to the fourth electrode 044 generates an electrostatic force as shown by F4; the direction of the force F2 is opposite to that of F1 and the same as that of F3; thereby driving the modulation unit along Figure 6 The second axis (Axis3) shown in (a) is deflected by the target angle, and the direction of the deflection is the direction of the forces of F2 and F3.

[0070] The principles of the other primary color cycles are similar and will not be described in detail here.

[0071] Therefore, the light projection device of this embodiment uses static electricity to mechanically rotate the entire modulation unit to change the propagation direction of the light incident on the modulation unit, thereby improving the resolution of the projection equipment. It has the characteristics of low insertion loss, small crosstalk, good repeatability, fast response speed, and long life.

[0072] In some embodiments, the driving unit includes a driving circuit board and a plurality of driving modules, each driving module includes a driving substrate and an elastic bracket connected to each other, each elastic bracket is connected to each side of the modulation unit through a connecting shaft, and a plurality of electrodes corresponding to the plurality of driving modules are arranged on the driving circuit board; the driving circuit board is used to apply a phase-complementary alternating voltage to any pair of two electrodes in symmetrical positions; two driving modules corresponding to the two electrodes are used to make the driving substrates in the two driving modules interact with the two electrodes when a second preset voltage is applied, so that the elastic brackets in the two driving modules are deformed in a target direction, thereby driving the modulation unit to move a target distance in the target direction. The target distance is not limited and can be determined according to the preset distance.

[0073] Optionally, the driving substrates in the two driving modules interact with the two electrodes to generate two electrostatic forces with the same direction, and the two electrostatic forces drive the elastic bracket to deform in a target direction; the target direction is the direction of the combined force of the two electrostatic forces, for example, it can be the left, top, right, bottom, upper left, upper right, lower right and upper left of the original position before the modulation unit moves. The second preset voltage is not limited, for example, it can be 50V.

[0074] Optionally, the modulation unit and the driving circuit board are quadrilaterals, four electrodes are arranged on the driving circuit board, and the four electrodes are respectively located at the midpoints of the sides of the driving circuit board; the driving unit includes four driving modules, and the four driving modules are respectively connected to the midpoints of the sides of the modulation unit;

[0075] Alternatively, eight electrodes are arranged on the driving circuit board, four of the eight electrodes are respectively located at the midpoints of the four sides of the driving circuit board, and the other four electrodes are respectively located at the four corners of the driving circuit board; the driving unit includes eight driving modules, four of the eight driving modules are respectively connected to the midpoints of the four sides of the modulation unit, and the other four driving modules are respectively connected to the four corners of the modulation unit.

[0076] For example, Figure 7 is a partial structural diagram of another light modulation device provided in this embodiment; Figure 7 Only the driving module 1 and the driving module 3 connected to the modulation unit are shown, and the other driving modules are similar and will not be described again. The driving circuit board is located at the lower layer of the modulation unit ( Figure 7 (not shown), electrodes 1 and 3 are arranged on the driving circuit board in symmetrical positions. Assuming that one frame image period (about 16.67ms) corresponds to 4 primary color periods (Subfram), the modulation unit can deflect 4 times, and the light source device emits blue B, red R, and green G three-color light (RGB Timing) according to the primary color period timing. A second preset voltage is applied to the metal substrate in the driving module 1 and the driving module 3; after receiving the pulse signal of VSYNC:

[0077] An alternating voltage with complementary phases is applied to the electrode 1 and the electrode 3; the two driving modules corresponding to the two electrodes, the metal substrates in the driving module 1 and the driving module 3 interact with the two electrodes, and two electrostatic forces (F1 and F2 or F3 and F4) with the same direction are generated to the right or left, so that the elastic brackets in the two driving modules are deformed to the left or right, thereby driving the modulation unit to move the target distance to the left or right, such as Figure 7 As shown, the solid line indicates the position before the movement, and the dotted line indicates the position after the movement. The principles of moving upward, downward, lower left, upper left, upper right, and lower right are similar and will not be described here.

[0078] In some embodiments, the spacing between the driving substrate and the driving circuit board is a target distance, the amplitude difference of the phase-complementary alternating voltage is a target amplitude difference, and the physical size of any one of the multiple electrodes is a target size; when the driving substrate applies a first preset voltage, it interacts with the two electrodes applying the phase-complementary alternating voltage to generate two electrostatic forces, wherein the magnitude of any one of the electrostatic forces is determined based on the target distance, the target amplitude difference, the target size, and the relative dielectric constant of the dielectric materials of the driving substrate and the electrode.

[0079] For example, according to the above Figure 2 The first pre-voltage V0 = 50V, the phase-complementary alternating voltages are V1 = +50V, V2 = -50V, then ΔV = 100V, assuming the physical size of the electrode L = W = 1mm, the capacitance C according to the definition of capacitance can be expressed by the following formula:

[0080]

[0081] ε r represents the relative dielectric constant between the metal substrate and the dielectric material of the electrode, ε0 represents the dielectric constant in a vacuum, and d represents the distance between the metal substrate and the electrode.

[0082] The electric potential energy between the metal substrate and the electrode can be expressed by the following formula:

[0083]

[0084] Therefore, the electrostatic force F d It can be expressed by the following formula:

[0085]

[0086] When the first pre-voltage of +50V is applied to the metal substrate, an alternating voltage of +50V or -50V is applied to the electrode, and d is 2um, the electrostatic force between the metal substrate and the electrode is:

[0087]

[0088] In some embodiments, the driving unit is connected to the modulation unit through a connecting member, and the driving unit includes a driving circuit board and a plurality of deformable material blocks; the driving circuit board is used to apply a phase-complementary alternating voltage to any two deformable material blocks in symmetrical positions among the plurality of deformable material blocks; the two deformable material blocks are used to deform in opposite directions under the action of the phase-complementary alternating voltage to drive the modulation unit to deflect the target angle along the third axis of the modulation unit, and the third axis corresponds to the symmetry axis of the two deformable material blocks. Optionally, the two deformable materials are deformed under the action of the phase-complementary alternating voltage to generate a driving force, and the directions of the driving forces are opposite and located on both sides of the third axis.

[0089] Among them, the deformable material block can be a material that can produce an inverse piezoelectric effect when a voltage is applied, such as a piezoelectric ceramic material, and its mechanical deformation can be controlled by voltage; the connecting parts are not limited and can be beams, bases and brackets formed of insulating materials.

[0090] For example, Figure 8 is a partial structural diagram of a light modulation device provided in this embodiment; Figure 8 As shown, the modulation unit can be a DMD chip. The DMD chip and the deformable material block 02 can be connected through a crossbeam and a substrate. The deformable material block is a piezoelectric ceramic material. A torsion beam can be set between the substrate and the DMD chip. When the piezoelectric ceramic material block is deformed, the substrate is driven to move, so that the DMD chip deflects along the torsion beam. The piezoelectric ceramic material blocks can be set on both sides of the torsion beam, symmetrically relative to the torsion beam, and the torsion beam corresponds to the third axis. When given Figure 8 When a phase-complementary alternating voltage is applied to the two piezoelectric ceramic material blocks in the device, the piezoelectric ceramic material blocks are deformed, generating a driving force as shown in FIGS. F1 and F2 , which drives the DMD chip to deflect the target angle along the torsion beam.

[0091] As can be seen from the above, in this embodiment, a driving unit is used to drive the modulation unit to deflect or move multiple times within a frame of the image cycle, so that the multiple color lights modulated by the modulation unit enter the light projection device at different incident angles, thereby causing the pixels in the projection picture projected by the light projection device to shift, which can increase the pixels of the projection picture when the projection device projects a frame of image, thereby improving the resolution of the projection device; and the driving unit and the modulation unit are packaged into an integrated light projection device. While the modulation unit modulates the multi-color light generated by the light source device, the driving unit can directly drive the modulation unit to deflect or move, that is, when realizing the improvement of the resolution of the projection device, no other external components are required, and the optical path is simple, so the size of the projection device can be reduced and the cost can be reduced.

[0092] Fig. 9This is a schematic diagram of the functional modules of a projection device provided in this application. Fig. 9 As shown, the projection device includes an image processor 101 and a projection optical engine 102. Among them:

[0093] The image processor 101 may be a microcontroller, a dedicated image processing chip, etc. The microcontroller may be an ARM chip, a microcontroller unit (MCU), etc. The dedicated image processing chip may be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processor (NPU), etc. The image processor 101 may be used for video decoding, image quality processing, etc.

[0094] The projection optical machine 102 may include a driver chip, a spatial light modulator, and the optical system described in the above embodiments. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), a liquid crystal on silicon (LCOS), etc. The driver chip corresponds to the spatial light modulator, for example, the digital micromirror device may be driven by a digital light processing element (DLP). The projection optical machine 102 is used to project the image to be projected into a projection screen.

[0095] In some embodiments, the projection device further includes a central controller 103 with one or more processing cores, which may be a CPU, ARM, MCU or other controller. The central controller 103 is the control center of the projection device, and uses various interfaces and lines to connect various parts of the entire projection device, and can run or execute software programs and / or operating systems stored in the memory 104, and call data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 may be integrated into one processor.

[0096] In some embodiments, the projection device further includes a memory 104 of one or more computer-readable storage media, an input module 105, a communication module 106, a power supply 107 and other components. Those skilled in the art will appreciate that Fig. 9 The structure of the projection device shown in the figure does not constitute a limitation on the projection device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0097] The memory 104 can be used to store software programs and operating systems. The central controller 103 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the projection device, etc. In addition, the memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 104 can also include a memory controller to provide the central controller 103 with access to the memory 104.

[0098] The projection device may further include an input module 105, which may be used to receive input digital or character information and generate remote control, keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0099] The projection device may further include a communication module 106. In some embodiments, the communication module 106 may include a wireless module. The projection device may perform short-distance wireless transmission through the wireless module of the communication module 106, thereby providing the user with wireless broadband Internet access. For example, the communication module 106 may be used to help the user access streaming media, etc.

[0100] The projection device further includes a power supply 107 for supplying power to various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply 107 can also include any components such as one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators.

[0101] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items. The character " / " herein generally indicates that the objects associated before and after are a kind of "or" relationship.

[0102] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical system, characterized in that: The optical system includes a light source device, a light modulation device and a light projection device, wherein the light modulation device includes a modulation unit and a driving unit; The light source device is used to sequentially emit multiple color lights within a primary color cycle; The modulation unit is used to modulate the multiple color lights emitted by the light source device; The driving unit is used to drive the modulation unit to move or deflect multiple times within one frame of the image cycle, so that the multiple color lights modulated by the modulation unit enter the light projection device at different incident angles; The light projection device is used to receive the modulated multiple color lights and project them into a projection picture; Wherein, the one frame image period corresponds to a plurality of primary color periods, each primary color period corresponds to an emission angle and a projection screen, and the distance between corresponding pixels in the projection screens corresponding to two adjacent primary color periods is a preset distance.

2. The optical system according to claim 1, characterized in that The driving unit comprises a driving substrate and a driving circuit board, the driving substrate and the driving circuit board are elastically connected, a plurality of electrodes are arranged on the driving circuit board, and the modulation unit and the driving substrate are insulated and connected; The driving circuit board is used to apply a phase-complementary alternating voltage to any two electrodes in symmetrical positions among the plurality of electrodes; The driving substrate is used to interact with two electrodes applying alternating voltages with complementary phases when a first preset voltage is applied, and drive the modulation unit to deflect a target angle along a first axis of the modulation unit, wherein the first axis corresponds to an axis of symmetry of the two electrodes.

3. The control method of the optical system according to claim 2, characterized in that: The driving circuit board is further used to apply complementary alternating voltages to two electrodes in symmetrical positions in each pair of the multiple electrodes, and the alternating voltage applied by any electrode is complementary in phase to one of the two adjacent electrodes and has the same phase as the other; The driving substrate is also used to interact with multiple electrodes applying alternating voltages with complementary phases when a first preset voltage is applied, so as to drive the modulation unit to deflect the target angle along a second axis of the modulation unit, wherein the second axis corresponds to the target axis of the multiple electrodes, the alternating voltages applied by the electrodes on the same side of the target axis have the same phase, and the alternating voltages applied by the electrodes on different sides of the target axis have opposite phases.

4. The control method of the optical system according to claim 2, characterized in that: The distance between the driving substrate and the driving circuit board is a target distance, the amplitude difference of the phase-complementary alternating voltage is a target amplitude difference, and the physical size of any electrode among the plurality of electrodes is a target size; When a first preset voltage is applied to the driving substrate, it interacts with two electrodes applying a phase-complementary alternating voltage to generate two electrostatic forces, wherein the magnitude of any electrostatic force is determined based on the target distance, the target amplitude difference, the target size, and the relative dielectric constant of the dielectric materials of the driving substrate and the electrodes.

5. The control method of the optical system according to claim 1, characterized in that: The driving unit comprises a driving circuit board and a plurality of driving modules, each driving module comprises a driving substrate and an elastic bracket connected to each other, each elastic bracket is connected to each side of the modulation unit through a connecting shaft, and a plurality of electrodes corresponding to the plurality of driving modules are arranged on the driving circuit board; The driving circuit board is used to apply a phase-complementary alternating voltage to any pair of two electrodes in symmetrical positions; The two driving modules corresponding to the two electrodes are used to cause the driving substrates in the two driving modules to interact with the two electrodes when a second preset voltage is applied, so that the elastic brackets in the two driving modules are deformed in a target direction, thereby driving the modulation unit to move a target distance in the target direction.

6. The control method of the optical system according to claim 5, characterized in that: The modulation unit and the driving circuit board are quadrilaterals, and four electrodes or eight electrodes are arranged on the driving circuit board, and the four electrodes are respectively located at the midpoints of the sides of the driving circuit board, or four electrodes of the eight electrodes are respectively located at the midpoints of the four sides of the driving circuit board, and the other four electrodes are respectively located at the four corners of the driving circuit board; The driving unit includes four or eight driving modules, and the four driving modules are respectively connected to the midpoint positions of each side of the modulation unit, or four driving modules among the eight driving modules are respectively connected to the midpoint positions of the four sides of the modulation unit, and the other four driving modules are respectively connected to the four corners of the modulation unit.

7. The optical system according to claim 1 or 5, characterized in that: The driving circuit board is provided with a plurality of driving circuits corresponding to the plurality of electrodes; The plurality of driving circuits are used to apply alternating voltages to the plurality of electrodes under the control of an enable signal.

8. The control method of the optical system according to claim 5, characterized in that: The driving substrate and the driving circuit board are quadrilaterals, four electrodes and corresponding four driving circuits are arranged on the driving circuit board, the four electrodes include a first electrode, a second electrode, a third electrode and a fourth electrode, each electrode is located at the midpoint of each side of the driving circuit board, the first electrode and the third electrode are in symmetrical positions, the second electrode and the fourth electrode are in symmetrical positions, the four driving circuits include a first driving circuit, a second driving circuit, a third driving circuit and a fourth driving circuit, and the enable signal includes a first enable signal and a second enable signal; The first driving circuit and the third driving circuit are used to apply alternating voltages with complementary phases to the first electrode and the third electrode respectively when the first enable signal is in a target state; The second driving circuit and the fourth driving circuit are used to apply alternating voltages with complementary phases to the second electrode and the fourth electrode respectively when the second enable signal is in a target state; Among them, when the first enable signal and the second enable signal are in the target state at the same time, the alternating voltage applied to the first electrode has the same phase as the alternating voltage applied to the second electrode and is complementary in phase to the alternating voltage applied to the fourth electrode, or has a complementary phase to the alternating voltage applied to the second electrode and the same phase as the alternating voltage applied to the fourth electrode.

9. The control method of an optical system according to claim 1, characterized in that: The driving unit is connected to the modulation unit via a connecting piece, and the driving unit includes a driving circuit board and a plurality of deformation material blocks; The driving circuit board is used to apply a phase-complementary alternating voltage to any two deformable material blocks in symmetrical positions among the plurality of deformable material blocks; The two deformable material blocks are used to deform in opposite directions under the action of the phase-complementary alternating voltage to drive the modulation unit to deflect the target angle along the third axis of the modulation unit, and the third axis corresponds to the symmetry axis of the two deformable material blocks.

10. A projection device, characterized in that: The optical system comprises the optical system described in claims 1-9.

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