CN108490724A - light emitting device - Google Patents

Abstract

The invention provides a light-emitting device which comprises a substrate, a plurality of light source chips, a cover plate and an optical piece. The substrate comprises a circuit block, the plurality of light source chips are fixed on the substrate, and the circuit block of the substrate is related to the light source chips in operation. The cover body is fixed on the substrate and covers the light source chips, and the cover body comprises a surface. The optical member is fixed on the surface of the cover body, wherein a plurality of light beams emitted by the light source chips form a structured light pattern after passing through the optical member. The light-emitting device of the invention utilizes the cover body to be directly fixed on the substrate with the plurality of light source chips to cover the plurality of light source chips, can reduce the height and the volume of the whole device, is suitable for being applied to a device with small volume, and can be used as a laser diode module.

Description

light emitting device

This application is a divisional application of an invention patent application with the application number 201510482381.6 and the application date of August 07, 2015, named "Lighting Device".

technical field

The invention relates to a light-emitting structure, in particular to a device for emitting structured light.

Background technique

China Taiwan's new patent No. M490043 proposes a projection device that can project multiple graphics, which includes an outer frame, a light source module unit installed on one side of the outer frame, and a light source module unit installed in the outer frame and connected to the outer frame. The light source unit is a diffractive optical unit at intervals, and the projection device can project multiple graphics, thereby overcoming the problem that the existing projection device can only project a single virtual figure.

Although the above-mentioned projection device can overcome the monotony of a single projected image, its volume still has room for improvement for modern wearable devices, portable communication devices, camera devices or detection devices.

Contents of the invention

The technical problem to be solved by the present invention is to provide a light-emitting device for the above-mentioned deficiencies in the prior art, the optical components of which directly cover multiple light source chips, reduce the height and volume of the entire light-emitting device, and are suitable for use in wearable devices .

The technical problem to be solved by the present invention is to provide a light-emitting device that can be used as a laser diode module to collimate multiple laser beams and convert laser beams to form a specific The patterned structured light can be applied to portable and mobile camera or detection devices.

The technical problem to be solved by the present invention is to provide a laser diode module, which includes a plurality of laser light source chips, and optical components with diffractive optical elements, to collimate the point laser beam and Guide light into white light or colored structured light style.

The technical solution adopted by the present invention to solve the technical problem is to provide a light emitting device, including: a substrate, the substrate includes a circuit block; a plurality of light source chips fixed on the substrate, the circuit block and the circuit block of the substrate The operation of some light source chips; the cover fixed on the substrate, the cover covers the light source chips, the cover includes a surface; and the optical part fixed on the surface of the cover, wherein the light sources Multiple light beams emitted by the chip pass through the optical element to form a structured light pattern.

Preferably, the light beams emitted by the light source chips include multiple laser beams, and the wavelengths of the laser beams include ultraviolet light, visible light, near-infrared light, far-infrared light or thermal radiation bands or a combination of the above wavelengths.

Preferably, the wavelengths of the laser beams are a combination of red, green and blue wavelengths.

Preferably, the optical component is attached on the surface of the cover in the form of a single-layer film, a multi-layer film or a composite film layer.

Preferably, the surface is an inner surface facing the light source chips or an outer surface exposed to the outside, or includes both the inner surface and the outer surface.

Preferably, the distance between the optical element on the outer surface and a surface of the substrate on which the light source chips are disposed is no more than 3 millimeters (mm).

Preferably, the optical element includes a diffractive optical element disposed on the outer surface, and the outer surface provides a light exit surface of the light beam with a numerical aperture smaller than 0.65.

Preferably, the optical element includes a guiding lens or a diffractive optical element, or includes both the guiding lens and the diffractive optical element.

Preferably, the light guiding lens comprises a wedge-bending light guide.

Preferably, the distance between adjacent two of the light source chips is less than 1.0 mm.

Preferably, the surface of the cover is a plane or a curved surface.

Preferably, the circuit block includes a driving circuit, and the driving circuit drives the light source chips to operate synchronously or asynchronously, so as to change the range and pattern of the structured light pattern.

Preferably, the circuit block includes a driving circuit and one or more photosensitive components, or, the circuit block includes a driving circuit and multiple photosensitive components.

Preferably, the plurality of photosensitive elements sense different wavelengths.

Preferably, when the light source chips are arranged in a circle, the diameter of the circle is not greater than 5.0 mm.

The present invention also provides a laser diode module, including: a substrate; a plurality of light source chips fixed on the substrate; and an optical component covering the light source chips, the optical component has a diffractive structure, wherein the light sources Multiple laser beams emitted by the chip pass through the diffraction structure to form a structured light pattern.

Preferably, the wavelengths of the laser beams emitted by the light source chips include ultraviolet light, visible light, near-infrared light, far-infrared light or thermal radiation bands or a combination of the above wavelengths.

Preferably, the wavelengths of the laser beams include a combination of red, green and blue wavelength bands.

Preferably, the optical component includes a cover, and the diffractive structure is attached to an inner surface of the cover facing the light source chips and an outer surface exposed to the outside in the form of a single-layer film, a multi-layer film or a composite film layer. surface, or both the inner surface and the outer surface.

Preferably, when the diffractive structure is attached to the outer surface, the distance from the apex of the diffractive structure to a surface of the substrate on which the light source chips are fixed is no more than 3 millimeters (mm), or, when the diffractive structure is attached When on the inner surface, the distance from the outer surface to the surface of the substrate on which the light source chips are fixed is no more than 3 millimeters (mm).

Preferably, the optical component further includes a light guide lens, the light guide lens is fixed on the inner surface or the outer surface of the cover, and the light guide lens and the diffractive structure are located on different surfaces.

Preferably, the optical component provides a light exit surface of the laser beams with a numerical aperture smaller than 0.65.

Preferably, the optical component provides a light exit surface of the laser beams with a numerical aperture smaller than 0.5.

Preferably, the optical axes of the light source chips are parallel to each other or the difference is less than 5 degrees.

Preferably, the optical component further includes a wedge-shaped curved light guide element, the diffraction structure and the wedge-shaped curved light guide element are attached to an inner surface of the cover facing the light source chips or an outer surface exposed to the outside, the The diffractive structure and the wedge-shaped curved light-guiding element are located on different surfaces, and the inclination angle of the wedge-shaped curved light-guiding element is less than 15 degrees.

Preferably, the distance between any two adjacent light source chips among the light source chips is less than 1.0 mm, or when the light source chips are arranged in a circle, the diameter of the circle is not greater than 5.0 mm.

Preferably, the substrate further includes a driving circuit for driving the light source chips, and the driving circuit drives the light source chips to operate synchronously or asynchronously, so as to change the range and pattern of the structured light pattern.

Preferably, the structured light pattern is random dot distribution, symmetrical non-staggered strip distribution, asymmetric non-staggered strip distribution, symmetrical interlaced strip distribution or asymmetric interlaced strip distribution, when the driving circuit simultaneously activates the light sources chip, the random dot density of the random dot distribution increases or the range becomes larger; the density of the symmetrical non-staggered strip distribution or the light strip density of the asymmetric non-staggered strip distribution increases or the distribution range becomes larger; and the symmetrical interlaced The density of the stripe distribution or the light stripe density of the asymmetric staggered stripe distribution increases or the distribution range becomes larger.

Preferably, the structured light pattern is random dot distribution, symmetrical non-staggered strip distribution, asymmetric non-staggered strip distribution, symmetrical interlaced strip distribution or asymmetric interlaced strip distribution, when the driving circuit is sequentially activated asynchronously When the light source chips are used, the structured light pattern scans part or all of an associated viewing angle block.

The optical components of the light-emitting device of the present invention are directly fixed on the substrate with the light source chip, covering multiple light source chips, reducing the height and volume of the entire light-emitting device, and are suitable for use in wearable devices, portable and mobile imaging or detection devices; The light-emitting device includes a plurality of light source chips, combined with multiple lasers, and can produce white light or colorful structured light; the light-emitting device uses optical components with a diffraction structure to directly collimate multiple laser beams, reducing the height and volume of the entire device . Moreover, the light-emitting device of the present invention is directly fixed on a substrate with multiple light source chips by using an optical component with a diffractive structure, and can be used as a laser diode module to reduce the height and volume of the entire module, and is suitable for use in small-volume devices; and The laser diode module includes a plurality of light source chips, matched with optical components with a diffraction structure, to collimate the point-shaped laser beam and guide the light into a white light or colored structured light pattern; in addition, the laser diode module can use a layered Optical components are used to collimate multiple laser beams and convert laser beams to form a specific pattern of structured light, which can be applied to portable and mobile imaging or detection devices.

Description of drawings

FIG. 1 is a partial top view schematic diagram of a substrate and a light source chip of the present invention.

Fig. 2 is a schematic cross-sectional view along line A-A' of Fig. 1 .

FIG. 3 is a schematic cross-sectional view of a first configuration of the substrate, the light source chip and the optical components of the present invention in FIG. 1 .

4 is a schematic cross-sectional view of a second configuration of the substrate, light source chip, sensing component and optical component of the present invention in FIG. 1 .

5 is a schematic cross-sectional view of a third configuration of the substrate, light source chip, sensing component and optical component of the present invention in FIG. 1 .

6 is a schematic cross-sectional view of a fourth configuration of the substrate, light source chip, reflector and optical components of the present invention.

FIG. 7 is a perspective view of the pattern and viewing angle of the structured light emitted by the light emitting device of the present invention.

Detailed ways

The substrate referred to below in the present invention may be a rigid printed circuit board (PCB), which may include many circuit blocks performing specific functions, or may further include wires connecting these circuit blocks. Optionally, the substrate may be a combination of a rigid printed circuit board and a flexible circuit board, or a combination of a rigid printed circuit board and other non-rigid printed circuit boards, such as a metal heat sink, a sapphire substrate, and the like. The circuit block referred to in the present invention is composed of several wires, active and passive components, such as one or more photosensitive components, optical components, or even integrated circuits, etc., which mainly includes a drive circuit that can perform the function of a drive chip . The substrate may also include other circuits, active and passive elements, such as one or more photosensitive components, optical elements, or further include other integrated circuits.

The light source chip referred to in the present invention hereinafter may be a chip that emits laser light, such as a semiconductor laser chip. Further, the light source chip of the present invention emits laser light of a specific wavelength, such as ultraviolet light, visible light, infrared light, near-infrared light, mid-infrared light (Middle Infra-Red, MIR), etc., and the part of visible light includes at least red light, green light light and blue light. Optionally, the light source chip may include a laser that emits a thermal band, or a combination of all of the above specific wavelengths. Moreover, the type of the light source chip can also be configured as an edge-emitting laser (EEL) chip or a vertical-cavity surface-emitting laser (VCSEL) chip according to requirements.

The optical member referred to below in the present invention is a member that can receive light, perform a specific conversion function, and then output light. In addition, the optical component can cover all or part of the light source chip of the present invention fixed on the substrate; wherein, when the optical component covers the light source chip, there can be a certain gap between the light source chip and the light source chip. Also, the optical component may include a cover and an optical component (optical component) fixed on the cover; wherein, the optical component may be an optical structure that is physically or chemically fabricated directly on the structure of the cover, or Other materials are fixed on the cover body by sticking, pasting or other appropriate methods. Therefore, the cover body, the optical member or the optical component is light-transmittable. For example but not limited to, the material of the cover body can be polymethyl methacrylate (poly methyl methacrylate, PMMA), polycarbonate (polycarbonate, PC), K9, BK7, calcium fluoride compound (CaF2), calcium fluoride crystal, sapphire, silica, quartz glass, crystal, glass or resin, etc. The optical element can be made directly from the material of the cover body, or a coating film can be attached to the cover body; wherein, the coating film can be a single-layer film, a multi-layer film or a composite film layer.

Moreover, the shape of the optical component of the present invention can match the arrangement of the light source chips to be covered and the function of outputting and entering light, and it can be a cylinder, a polygonal prism or other suitable shapes. Secondly, the optical component can be fixed on the substrate in an appropriate manner. For example but not limited to, the optical component can be an insert inserted into an insertion hole of the substrate, or fixed on the substrate through an adhesive structure.

Fig. 1 is a schematic top view of a substrate and a light source chip of the present invention, and Fig. 2 is a schematic cross-sectional view along line A-A' of Fig. 1 . 1 and 2, the substrate 10 of the light emitting device 1 includes a circuit block 11, and four light source chips 12, 14, 16 and 18 are fixed on the substrate 10, wherein the four light source chips 12, 14, 16 The optical axes of 18 and 18 are substantially parallel to each other. For example, the optical axes 121, 141 and 181 shown in FIG. greater than 5 degrees; in addition, the present invention is not limited to the optical axis of the light source chip perpendicular to the substrate, and the optical axis of the light source chip and the substrate can be set at an angle due to design or use requirements, that is, the light emitting surface of the light source chip and the substrate form an angle. Tilt angle. Furthermore, because the four light source chips 12, 14, 16 and 18 can be edge-emitting laser chips or vertical cavity surface-emitting laser chips, the light defined by the light emitting surfaces of the light source chips 12, 14, 16 and 18 The axes can also pass through other optical elements on the substrate 10, such as reflectors (not shown), to guide the optical axes 121, 141 and 181 perpendicular to the substrate 10 (the optical axis of the light source chip 16 is not shown). Secondly, in one embodiment, the distance P between the light source chips 12 and 16 is less than 1.0 millimeter (mm), that is, the distance between the two light source chips fixed on the substrate 10 is less than 1.0 mm. An optional definition is that the light source chips are arranged in a circle O, and the diameter of the circle O is not more than 5.0 mm, so as to achieve a small enough equivalent area and small volume. Furthermore, the circuit block 11 is related to the operation of the light source chips 12, 14, 16 and 18, for example, including the driving circuits of the light source chips 12, 14, 16 and 18, driving the light source chips 12, 14, 16 and 18 to emit laser spot beams . In addition to the circuit block 11, the substrate 10 may still include one or more other optical elements fixed thereon, such as one or more photodiodes 17 (photodiodes) or other sensing components or sensing elements, wherein the photodiodes 17 , sensing components or sensing elements can sense light of different wavelengths. Optionally, the photodiode 17 or other sensing elements can also be fixed on the light source chip 12 , 14 , 16 or 18 if the volume is small enough.

FIG. 3 is a schematic cross-sectional view of the arrangement of the substrate, the light source chip and the optical components of the present invention in FIG. 1 . Please refer to FIG. 1 and FIG. 3 , the optical component 20 is fixed on the substrate 10 , wherein the optical component 20 includes a cover 22 covering the light source chips 12 , 14 , 16 and 18 . The cover 22 has an inner surface 221 facing the light source chips 12, 14, 16 and 18 and an outer surface 223 exposed to the outside, wherein the inner surface 221 and the outer surface 223 can be a plane or a curved surface, and the cover 22 The inner surface 221 maintains a distance from the light source chips 12 , 14 , 16 and 18 . The optical component 20 further includes an optical component 24. In one embodiment, the optical component 24, for example, an optical component using a diffractive optical element (Diffractive Optical Elements, DOE) as a guiding lens (guidinglens), is located outside the cover body 22 The surface 223 , the distance L from the apex of the optical element 24 to the surface of the substrate 10 on which the light source chip is disposed is not more than 3 millimeters (mm).

As mentioned above, in order to reduce the height of the optical component 20, the optical component 24 can be formed on the cover body 22 in the form of film or layer, or directly on the outer surface 223 of the cover body 22 by physical or chemical means. do it. Secondly, the multiple light beams 122, 142 and 182 emitted by the light source chips 12, 14 and 18 (including the light source chip 16 not seen in this viewing angle) can pass through the optical part 24 of the optical component 20 to form a structured light pattern 26. The difference in the diffraction structure of the element 24, especially the difference in the diffraction structure of a collimated light beam, can generate different patterns of the structured light patterns 26. Optionally, as shown in FIG. 4, the optical element 34 can be located on the inner surface 321 of the cover body 32, and at this time, the distance L from the outer surface 323 of the cover body 32 to the surface of the substrate 10 where the light source chip is arranged is no more than 3 millimeters (mm ). In addition, the photodiodes 17 on the substrate 10 can also be covered by the cover 32 . According to the above, the optical component including the cover is covered on the light source chip; after receiving the laser beams emitted by the light source chip, the optical component collimates the laser beams and converts the laser beams into a specific pattern of structured light and outputs the structure Light. The cover body of the optical component of the present invention provides a light exit surface, the numerical aperture (numerical aperture) of the light exit surface of the optical component is less than 0.65, or more strictly can be less than 0.5, or the light exit surface of the optical component has at least 0.1 millimeter (mm) The effective size is to provide enough output surface to output structured light.

Optionally, as shown in FIG. 5 , the optical component 40 includes a diffractive structure 44 formed on the outer surface 423 of the cover 42 and a light guide lens 48 fixed on the inner surface 421 of the cover 42 . The light guide lens 48 can also be coated or directly fabricated on the cover body 42, which can guide the multiple light beams 122, 142 and 182. Furthermore, the photodiode 17 or the sensing component or the sensing element may not be covered by the cover 42 . It can be understood that the light guide lens 48 of the present invention is not limited to the typical light guide element shown in FIG. 5 , and can also be a wedge-bending light guide element (wedge-bending light guider), and the light source can be translated or guided by the wedge-shaped bend light guide element. The multiple light beams 122, 142 and 182 emitted by the chips 12, 14 and 18 (including the light source chip 16 which is not seen in this viewing angle), for example, are emitted from the light source chip by means of a wedge-shaped curved light guide element with an inclination angle of 15 degrees. There are light beams 122, 142 and 182 with a light difference of 5 degrees.

6 is a schematic cross-sectional view of a fourth configuration of the substrate, light source chip, reflector and optical components of the present invention. Referring to FIG. 6, the light-emitting surfaces of the light source chips 52 and 54 fixed on the substrate 10 are not perpendicular to the surface of the light source chip fixing substrate 10, therefore, two reflectors 55 are also fixed on the substrate 10 and correspond to the light source chips 52 and 54 respectively. The cover 62 covers the light source chips 52 , 54 and the two reflectors 55 , and the optical element 64 is located on the outer surface of the cover 62 . In this embodiment, the two reflectors 55 respectively guide the light beams emitted by the light source chips 52 and 54 into light beams 522 and 542 perpendicular to the surface of the light source chip fixing substrate 10 .

FIG. 7 is a perspective view of the pattern and viewing angle of the structured light emitted by the light emitting device of the present invention. Please refer to FIG. 1 , FIG. 3 and FIG. 7 at the same time. The height of the light emitting device 1 from the ground is H, and the distance between a viewing angle block 66 associated with the structured light pattern 26 emitted by the light emitting device 1 and the light emitting device 1 is a distance D. The structured light pattern 26 can be static or dynamic, regular or irregular, and the dynamic ones can be changes such as movement, rotation, zoom-in, and zoom-out of the pattern itself, or changes in the range of the pattern. The structured light pattern 26 can be adjusted through different driving modes of the driving circuit (in the circuit block 11 ). In one embodiment, the time and mode of operation of the drive circuit injecting current to start the light source chips 12, 14, 16 and 18 can be synchronous or asynchronous. This situation can cause changes in the range of the structured light pattern 26 and the pattern itself, or is to scan part or all of an associated viewing angle block 66 , wherein the area of the structured light pattern 26 may be greater than, equal to, or smaller than the viewing angle block 66 . The driving circuit mode changes the scanning of the structured light pattern. For example, when the driving circuit starts the light source chips 12, 14, 16 and 18 sequentially in an asynchronous manner, an associated viewing angle associated with the structured light pattern formed by the present invention Block 66 may be partially or fully scanned.

For example, the structured light pattern 26 is a random point distribution. If the driving circuit synchronously drives the light source chips 12, 14, 16 and 18, the random point density of the structured light pattern 26 can be increased, or the range of the random point distribution can be increased. get bigger. Similarly, if the structured light pattern 26 is a symmetrical non-staggered strip distribution or an asymmetric non-staggered strip distribution, when the driving circuit synchronously drives the light source chips 12, 14, 16 and 18, the light strips of the structured light pattern 26 can be increased Density or distribution range; if the structured light pattern 26 is a symmetrical interlaced strip distribution or an asymmetric interlaced strip distribution, then when the drive circuit synchronously drives the light source chips 12, 14, 16 and 18, the light of the structured light pattern 26 can also be increased. Bar density or distribution range. Furthermore, if the driving circuit activates the light source chips 12 , 14 , 16 and 18 sequentially in an asynchronous manner, the structured light pattern 26 scans all or part of the viewing angle block 66 .

Therefore, the light-emitting device of the present invention has the following advantages: (1), direct collimation of multiple laser beams by using an optical component with a diffractive optical element structure, reducing the height and volume of the entire device; (2), including multiple light sources Chip, combined with multiple lasers, can produce white light or colorful structured light; (3), the optical components are directly fixed on the substrate with the light source chip, so it is suitable for wearable devices, portable and mobile camera or detection devices .

In addition, the light-emitting device of the present invention can be applied to a laser diode module to reduce the height and volume of the entire module, and is suitable for small-sized devices.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention. Therefore, all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in this disclosure. within the scope of the invention.

Claims (14)

1. a kind of laser diode module, which is characterized in that including：

Substrate；

The multiple light sources chip being fixed on the substrate；And

The optical component being covered on those light source chips, the optical component have a diffraction structure, wherein those light source chips The multiple tracks laser beam sent out is by forming a structure light pattern after the diffraction structure.

2. laser diode module as described in claim 1, which is characterized in that those laser beams that those light source chips are sent out Wavelength include ultraviolet light, visible light, near infrared light, far red light or heat radiation wave band or above-mentioned wavelength combination.

3. laser diode module as described in claim 1, which is characterized in that the wavelength of those laser beams includes feux rouges, green The combination of light and blue wave band.

4. laser diode module as described in claim 1, which is characterized in that the optical component includes lid, the diffraction knot Structure is attached at the lid towards an inner surface of those light source chips, exposure in the form of monofilm, multilayer film or composite film In an outer outer surface or both the inner surface and the outer surface.

5. laser diode module as claimed in claim 4, which is characterized in that when the diffraction structure is attached at the outer surface When, the distance that a surface of those light source chips is fixed on the vertex of the diffraction structure to the substrate is no more than 3 millimeters, alternatively, working as When the diffraction structure is attached at the inner surface, the distance which fixes the surface of those light source chips to the substrate does not surpass Cross 3 millimeters.

6. laser diode module as claimed in claim 4, which is characterized in that the optical component further includes light guiding lens, should Light guiding lens are fixed on the inner surface or outer surface of the lid, and the light guiding lens and the diffraction structure are located at different surfaces.

7. laser diode module as described in claim 1, which is characterized in that the optical component provides those laser beams one number It is worth the light-emitting surface that aperture is less than 0.65.

8. laser diode module as described in claim 1, which is characterized in that the optical component provides those laser beams one number It is worth the light-emitting surface that aperture is less than 0.5.

9. laser diode module as described in claim 1, which is characterized in that multiple optical axises of those light source chips are put down each other Row or difference are less than 5 degree.

10. laser diode module as claimed in claim 9, which is characterized in that the optical component further includes that wedge bend is led Optical element, the diffraction structure and the wedge bend light-guide device be attached at the lid towards an inner surface of those light source chips or It is exposed to an outer outer surface, the diffraction structure and the wedge bend light-guide device are located at different surfaces, and the wedge bend is guide-lighting The inclination angle of element is less than 15 degree.

11. laser diode module as described in claim 1, which is characterized in that wantonly two adjacent light in those light source chips For the distance of source chip less than 1.0 millimeters or when those light source chips are arranged as a circle, which is not more than 5.0 Millimeter.

12. laser diode module as described in claim 1, which is characterized in that the substrate further includes driving those light source cores The driving circuit of piece, the driving circuit is synchronous or those light source chips is asynchronously driven to operate, and uses and changes the structure light sample The range and pattern of formula.

13. laser diode module as claimed in claim 12, which is characterized in that the structure light pattern is that disorderly point is distributed, is right Claim the distribution of noninterlace strip, the distribution of asymmetric noninterlace strip, symmetrically staggeredly strip distribution or asymmetric staggeredly strip distribution, when When the driving circuit starts those light source chips simultaneously,

The random dot density of unrest point distribution increases or range becomes larger；

The density of the symmetrical noninterlace strip distribution or the striation density of the asymmetric noninterlace strip distribution increase or are distributed model It encloses and becomes larger；And

The symmetrical density or the striation density that strip is distributed asymmetric staggeredly increases or distribution change that strip is distributed of interlocking Greatly.

14. laser diode module as claimed in claim 12, which is characterized in that the structure light pattern is that disorderly point is distributed, is right Claim the distribution of noninterlace strip, the distribution of asymmetric noninterlace strip, symmetrically staggeredly strip distribution or asymmetric staggeredly strip distribution, when The driving circuit non-synchronously those light source chips of sequence starting when, which scans associated visual angle block Partly or entirely.