WO2016158174A1 - 投影表示装置 - Google Patents
投影表示装置 Download PDFInfo
- Publication number
- WO2016158174A1 WO2016158174A1 PCT/JP2016/056384 JP2016056384W WO2016158174A1 WO 2016158174 A1 WO2016158174 A1 WO 2016158174A1 JP 2016056384 W JP2016056384 W JP 2016056384W WO 2016158174 A1 WO2016158174 A1 WO 2016158174A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- projection display
- unit
- laser beam
- laser
- Prior art date
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- 238000009792 diffusion process Methods 0.000 claims abstract description 167
- 238000001514 detection method Methods 0.000 claims abstract description 98
- 238000000034 method Methods 0.000 claims description 48
- 230000003287 optical effect Effects 0.000 claims description 45
- 238000007689 inspection Methods 0.000 claims description 23
- 230000007547 defect Effects 0.000 claims description 21
- 230000006870 function Effects 0.000 description 7
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
- B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
- B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
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- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/02—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes by tracing or scanning a light beam on a screen
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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- H—ELECTRICITY
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- B60K2360/48—Sensors
Definitions
- the present invention relates to a projection display apparatus.
- a light source for emitting a laser beam for projection display As a conventional projection display apparatus, a light source for emitting a laser beam for projection display, a drive reflection unit for reflecting and scanning the laser beam emitted from the light source, and a predetermined for diffusing the laser beam scanned by the drive reflection unit
- a light diffusion portion having a region and detection means for detecting drop-off of the light diffusion portion
- the projection display apparatus as described above, although it is possible to detect the dropout of the light diffusion portion, it is not possible to grasp a defect such as a scratch or the like generated in a predetermined area of the light diffusion portion. For this reason, there is a possibility that projection display may be carried out by the light diffusion portion in which a defect such as a flaw occurs in a predetermined area. In this case, the laser light may not be properly diffused due to a defect such as a scratch or the like generated in a predetermined area of the light diffusion portion, and a load may be given to the eye of the person who views the projection display.
- An object of the present invention is to provide a projection display device capable of preventing a burden on a viewer's eye of a projection display.
- a projection display device reflects a light source for emitting a first laser beam for projection display and a second laser beam for inspection, and reflects the first laser beam and the second laser beam emitted from the light source. And detecting a second laser beam passing through a predetermined area of the light diffusion section and a light diffusion section having a predetermined area for transmitting and diffusing the first laser beam scanned by the drive reflection section and the drive reflection section.
- a control unit that executes detection processing of the second laser light and determines the state of a predetermined region of the light diffusion unit based on the detection value of the light detection unit, the control unit including the light diffusion unit When it is determined that a failure occurs in the predetermined area of the light diffusion unit as the state of the predetermined area, the projection display cancellation process is executed.
- the light detection unit detects the second laser light passing through the predetermined area of the light diffusion unit.
- the “second laser light passing through the predetermined area of the light diffusion portion” refers to the state of the predetermined area of the light diffusion portion, for example, the second laser light passes through the predetermined area of the light diffusion portion. It means the second laser beam.
- the second laser light is detected through the predetermined area of the light diffusion portion, so that the state of the predetermined area of the light diffusion portion can be determined. Then, when it is determined that a failure occurs in the predetermined area of the light diffusion unit as the state of the predetermined area of the light diffusion unit, the processing for stopping projection display is executed.
- the projection display apparatus it is possible to prevent the projection display from being continued without the first laser light being appropriately diffused due to the failure that has occurred in the predetermined area of the light diffusion portion. Therefore, according to this projection display apparatus, it is possible to prevent a load from being exerted on the eyes of the viewer of the projection display. Furthermore, by using the drive reflection unit, it is possible to scan the second laser beam for inspection along the scan line of the first laser beam for projection display. As a result, among the defects such as scratches generated in the predetermined area of the light diffusion portion, the defects occurring at the position deviated from the scan line (that is, the defects that do not affect the projection display) are generated on the scan line Failure (that is, problems affecting the projection display) can be grasped efficiently and reliably. Therefore, according to this projection display device, among the defects such as scratches generated in the predetermined area of the light diffusion portion, the processing for stopping the projection display is judged particularly when it is determined that the defect affecting the projection display has occurred. Can be performed.
- the control unit executes the detection processing of the second laser beam during projection display, and when it is determined that a problem occurs in the predetermined area of the light diffusion unit, the projection is performed.
- a projection display end process may be executed as the display stop process.
- control unit may cause the light source to stop emission of the first laser beam as the process of ending the projection display.
- the projection display apparatus further includes a shutter capable of advancing and retracting on the optical path of the first laser beam scanned by the drive reflecting portion or the optical path of the first laser beam transmitted through a predetermined region of the light diffusing portion.
- the control unit may arrange the shutter on the optical path of the first laser beam as the projection display end process.
- the control unit executes the detection processing of the second laser light at least one of before projection display and after projection display, and a problem occurs in a predetermined area of the light diffusion unit If it is determined, the projection display start prohibition process may be executed as the projection display cancellation process. As a result, it is possible to prohibit the projection display from being started by the predetermined area of the light diffusion portion in which the failure has occurred, and to prevent a burden on the eye of the person who sees the projection display.
- the light detection unit may further include a light selection unit that transmits the first laser light and reflects the second laser light at the position, and the light detection unit may detect the second laser light reflected by the light selection unit.
- the optical path of the first laser beam and the optical path of the second laser beam can be divided, so that the degree of freedom of the position at which the light detection unit is disposed can be increased.
- the light detection unit may detect the second laser light which has been transmitted through the predetermined region of the light diffusion unit and diffused and travels out of the optical path of the first laser light. This eliminates the need for an optical member for separating the optical path of the first laser beam and the optical path of the second laser beam, so that the projection display apparatus can have a simple configuration.
- the projection display apparatus further includes a light selection unit that reflects the first laser beam transmitted through the predetermined area of the light diffusion unit and transmits the second laser beam transmitted through the predetermined area of the light diffusion unit.
- the light detection unit may detect the second laser beam transmitted through the light selection unit.
- a projection display device capable of preventing a person's eye of a projection display from being burdened.
- FIG. 1 It is the schematic of the projection display apparatus of 1st Embodiment. It is the schematic of a part of projection display apparatus of 1st Embodiment. It is sectional drawing of the light-diffusion part of the projection display apparatus of 1st Embodiment, and a light-selection part. It is a flowchart which shows an example of the process by the control part of the projection display apparatus of 1st Embodiment. It is the schematic of a part of projection display apparatus of 2nd Embodiment. It is the schematic of a part of projection display apparatus of 3rd Embodiment. It is the schematic of a part of projection display apparatus of 4th Embodiment. FIG.
- FIG. 10 is a schematic view of a modification of a portion of the projection display apparatus of the first to fourth embodiments. It is the schematic of the modification of a part of projection display apparatus of 1st Embodiment. It is a flowchart which shows the 1st modification of the process by the control part of the projection display apparatus of 1st Embodiment. It is a flowchart which shows the 2nd modification of the process by the control part of the projection display apparatus of 1st Embodiment.
- the projection display apparatus 1 includes a light source 2, a scanning drive mirror (drive reflection unit) 3, a light diffusion unit 4, a light selection unit 5, and a light detection unit 6. ing.
- the projection display device 1 is, for example, a laser scanning projection display mounted on a car, and projects and displays an image on the windshield 100 of the car.
- the light source 2 emits a first laser beam L1 for projection display and a second laser beam L2 for inspection.
- the scanning drive mirror 3 reflects the first laser beam L 1 and the second laser beam L 2 emitted from the light source 2 and scans the predetermined area of the light diffusion unit 4.
- the light diffusion unit 4 transmits and diffuses the first laser beam L1 scanned by the scanning drive mirror 3.
- the light selection unit 5 transmits the first laser beam L ⁇ b> 1 and reflects the second laser beam L ⁇ b> 2 at a position on the emission surface of the light diffusion unit 4.
- the light detection unit 6 detects the second laser light L2 reflected by the light selection unit 5.
- the projection display 1 further includes flat mirrors 11 and 12, a concave mirror 13, and a housing 14.
- the flat mirrors 11 and 12 and the concave mirror 13 use the windshield 100 as the light L0 for projection display (that is, the light constituting the image of the first laser light L1 diffused in the predetermined area of the light diffusion unit 4). Lead.
- the housing 14 accommodates each part constituting the projection display device 1.
- the light source 2 has a plurality of first emission parts 21 a, 21 b, 21 c and a second emission part 22.
- the first emitting units 21a, 21b, and 21c are, for example, a red laser diode, a green laser diode, and a blue laser diode, respectively, and emit the first laser light L1 for projection display.
- the wavelength range of the first laser beam L1 emitted from each of the first emission units 21a, 21b, and 21c is a visible region.
- the second emitting unit 22 is, for example, an infrared laser diode, and emits a second laser beam L2 for inspection for grasping the state of a predetermined region of the light diffusing unit 4.
- the wavelength range of the second laser light L2 emitted from the second emission unit 22 is an infrared range.
- the wavelength range of the first laser beam L1 and the wavelength range of the second laser beam L2 are offset from each other.
- the first laser beam L1 emitted from the first emission unit 21c is reflected by the mirror 15c, travels on the optical path A, and reaches the scanning drive mirror 3.
- the first laser beam L1 emitted from the first emission unit 21b is reflected by the mirror 15b, travels on the optical path A, passes through the mirror 15c, and reaches the scanning drive mirror 3.
- the first laser beam L1 emitted from the first emission unit 21a is reflected by the mirror 15a, travels on the optical path A, passes through the mirrors 15b and 15c, and reaches the scanning drive mirror 3.
- the second laser beam L2 emitted from the second emission unit 22 is reflected by the mirror 16 and travels on the optical path A, passes through the mirrors 15a, 15b, and 15c, and reaches the scanning drive mirror 3.
- the mirrors 15a, 15b, 15c are, for example, dichroic mirrors.
- the scanning drive mirror 3 is disposed on the optical path A.
- the scanning drive mirror 3 is, for example, an electromagnetically driven optical mirror manufactured by MEMS (Micro Electro Mechanical Systems) technology.
- MEMS Micro Electro Mechanical Systems
- the scanning drive mirror 3 swings the mirror 3 a to reflect the first laser beam L 1 and the second laser beam L 2 traveling on the optical path A and scan the predetermined area R of the light diffusing unit 4. .
- the light diffusion portion 4 is disposed on the extension of the light path A.
- the light diffusion unit 4 is, for example, a microlens array having a plurality of microlenses arranged in a matrix, and transmits and diffuses the first laser light L1 for projection display scanned by the scanning drive mirror 3 .
- the incident surface 4a of the light diffusion portion 4 is a flat surface.
- the exit surface 4b of the light diffusion unit 4 is constituted by a plurality of convex surfaces corresponding to a plurality of microlenses.
- the light selection unit 5 is formed on the emission surface 4 b of the light diffusion unit 4 such that the surface 5 a on the light diffusion unit 4 side and the surface 5 b on the opposite side are along the plurality of convex surfaces on the emission surface 4 b of the light diffusion unit 4. ing.
- the light selection unit 5 is, for example, a light selection film coated on the emission surface 4b of the light diffusion unit 4, transmits light in the wavelength range of the first laser light L1 for projection display, and is a second laser for inspection. It has a function of reflecting light in the wavelength range of light L2.
- the light selection unit 5 is provided in a predetermined region R of the emission surface 4 b of the light diffusion unit 4 in which at least the first laser beam L 1 is scanned.
- the light detection unit 6 is disposed at a position where the second laser light L2 for inspection reflected by the light selection unit 5 can be detected.
- the light detection unit 6 is, for example, an infrared detector.
- the projection display apparatus 1 further includes a housing 7.
- the housing 7 accommodates the light source 2, the mirrors 15 a, 15 b, 15 c, 16 and the scanning drive mirror 3.
- the housing 7 is provided with a window 7a for emitting the first laser beam L1 and the second laser beam L2 scanned by the scanning drive mirror 3 to the outside.
- the light detection unit 6 is attached to the outer surface of the housing 7 so as to face the light diffusion unit 4. That is, the light detection unit 6 is disposed between the scanning drive mirror 3 and the light diffusion unit 4 in the opposing direction of the scanning drive mirror 3 and the light diffusion unit 4. Thus, the light detection unit 6 is disposed outside the housing 7.
- the projection display apparatus 1 further includes a control unit 8.
- the control unit 8 is configured of a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like, and controls each unit of the projection display device 1.
- the control unit 8 executes a projection display process, a detection process of the second laser light L2, and an end process of the projection display.
- the control unit 8 may be housed in the housing 7 or may be disposed outside the housing 7.
- control unit 8 An example of the process performed by the control unit 8 (an example in which the detection process of the second laser light L2 is performed during projection display) will be described with reference to FIG.
- control unit 8 when the control unit 8 receives an input signal for projection display start, the control unit 8 starts the output of each of the plurality of first emitting units 21a, 21b, 21c and the second emitting unit 22 (step S1). Thereby, the first laser beam L1 and the second laser beam L2 are emitted from each of the plurality of first emission units 21a, 21b, 21c and the second emission unit 22.
- step S1 the control unit 8 starts the operation of the scanning drive mirror 3 (step S2), and further, almost simultaneously with steps S1 and S2, the control unit 8 starts the operation of the light detection unit 6 (Step S3).
- the scanning drive mirror 3 the swing of the mirror 3 a is started, and the first laser beam L 1 and the second laser beam L 2 emitted from the light source 2 are scanned in the predetermined region R of the light diffusion unit 4 .
- the ratio of the first laser beam L1 for projection display emitted from each of the first emitters 21a, 21b, and 21c corresponds to the scanning position of the first laser beam L1 in the predetermined region R of the light diffusion portion 4. Be changed.
- the light L0 for projection display that is, the light constituting the image in the first laser light L1 diffused in the predetermined region R of the light diffusion portion 4) is generated by the plane mirrors 11 and 12 and the concave mirror 13
- the light is guided to the windshield 100, and the reflection on the windshield 100 is delivered to the driver's eyes as an image.
- the second laser beam L 2 for inspection scanned by the scanning drive mirror 3 is diffused by the predetermined region R of the light diffusing unit 4 and is reflected by the light selecting unit 5.
- the second laser light L 2 reflected by the light selection unit 5 is transmitted through the light diffusion unit 4 again and detected by the light detection unit 6.
- the control unit 8 receives a detection value related to the light amount of the second laser light L2 from the light detection unit 6.
- the detection value is associated with the scanning position of the second laser beam L2 in the predetermined region R of the light diffusion unit 4.
- the control unit 8 determines the state of the predetermined region R of the light diffusion unit 4 based on the detection value (step S4). More specifically, the control unit 8 stores a reference value regarding the light amount of the second laser light L2 in association with the scanning position of the second laser light L2 within the predetermined region R of the light diffusion unit 4.
- the control unit 8 compares the detection value corresponding to the position with the reference value in accordance with the scanning position of the second laser light L2 in the predetermined region R of the light diffusion unit 4. When the detection value is present in the predetermined range from the reference value, the control unit 8 determines that the state of the predetermined region R of the light diffusion unit 4 is normal, and continues the projection display process (step S5). ).
- the control unit 8 when the detection value exists outside the predetermined range from the reference value, the control unit 8 has a defect in the predetermined region R of the light diffusion portion 4 as the state of the predetermined region R of the light diffusion portion 4. It judges that it has arisen and the end processing of projection display is performed (Step S6).
- the control unit 8 causes each of the first emission units 21a, 21b, and 21c to stop emission of the first laser beam L1 as end processing of projection display which is one form of projection display cancellation processing.
- the projection display is forcibly terminated.
- the control unit 8 recognizes the failure in association with the scanning position of the second laser light L2 in the predetermined region R of the light diffusion unit 4. That is, the control unit 8 not only determines whether a failure has occurred in the predetermined region R of the light diffusion portion 4 but also a failure that has occurred in the predetermined region R of the light diffusion portion 4. Understand the position in R.
- the light selection unit 5 reflects the second laser light L ⁇ b> 2 for inspection at the position on the emission surface 4 b of the light diffusion unit 4 in the predetermined region R. Therefore, the second laser light L2 reflected by the light selection unit 5 reflects the state of the predetermined region R of the light diffusion unit 4. Therefore, according to the projection display apparatus 1, the state of the predetermined region R of the light diffusion unit 4 can be determined by detecting the second laser beam L2 reflected by the light selection unit 5. Then, when it is determined that a failure occurs in the predetermined area R of the light diffusion unit 4 as the state of the predetermined area R of the light diffusion unit 4, the projection display end process is executed as the projection display cancellation process. .
- the projection display apparatus 1 it is possible to prevent the projection display from being continued without the first laser light L1 being appropriately diffused due to the defect that has occurred in the predetermined region R of the light diffusion portion 4. Therefore, according to the projection display apparatus 1, it is possible to prevent a load from being exerted on the eyes of the viewer of the projection display. Furthermore, by using the scanning drive mirror 3, it is possible to scan the second laser beam L2 for inspection along the scan line of the first laser beam L1 for projection display. In particular, since the same scanning drive mirror 3 is used, it is possible to scan the second laser beam L2 for inspection on the same scan line as the first laser beam L1 for projection display.
- the defect that is, the defect that does not affect the projection display caused at the position deviated from the scan line. It is possible to efficiently and reliably grasp the problems that have occurred in (i.e., the problems that affect the projection display). Therefore, according to this projection display device 1, among the defects such as scratches generated in the predetermined region R of the light diffusion portion 4, in particular, when it is determined that the defect having an influence on the projection display has occurred, the projection display The cancellation process of can be performed.
- control unit 8 executes the detection processing of the second laser light L2 during projection display and determines that a defect occurs in the predetermined region R of the light diffusion unit 4, the processing is performed as cancellation processing of the projection display. , Execute the projection display end processing.
- the projection display can be immediately ended, and a burden can be prevented from being given to the eye of the person who sees the projection display. .
- control unit 8 causes the light source 2 to stop the emission of the first laser beam L1 as an end process of the projection display.
- the projection display device 1 includes the light selection unit 5 that transmits the first laser beam L1 and reflects the second laser beam L2 at a position on the emission surface 4b of the light diffusion unit 4 in the predetermined region R. . Then, the light detection unit 6 detects the second laser light L2 reflected by the light selection unit 5. As a result, the optical path of the first laser beam L1 and the optical path of the second laser beam L2 are divided, so the degree of freedom in the position where the light detection unit 6 is disposed can be increased.
- the projection display apparatus 1 of the second embodiment is different from the projection display apparatus 1 of the first embodiment in the configuration of the light source 2 and the light selection unit 5. As shown in FIG. 5, the light source 2 does not have the second emission part 22. Further, the light selection unit 5 transmits a part of the laser beam emitted from any one of the first emission units 21a, 21b and 21c as the first laser beam L1 for projection display and the remaining part of the laser beam Is an optical member having a function of reflecting the second laser beam L2 for inspection.
- the first emitting unit 21c which is a blue laser diode
- the remaining portion of the laser beam is used as the second laser beam L2 for inspection. It is used.
- the blue laser diode can emit a larger amount of light than that required for projection display as compared with the red laser diode and the green laser diode.
- the wavelength range of the first laser beam L1 and the wavelength range of the second laser beam L2 overlap with each other. Further, the wavelength range of the first laser beam L1 and the wavelength range of the second laser beam L2 are visible regions.
- the control unit 8 executes projection display processing, detection processing of the second laser beam L2, and termination processing of the projection display Be done. Therefore, even with the projection display apparatus 1 of the second embodiment, it is possible to prevent the eyes of the viewer of the projection display from being burdened.
- any one of the first emission units 21a, 21b, and 21c emits laser light including the first laser light L1 and the second laser light L2.
- the second emission unit 22 exclusively emitting the second laser beam L2 for inspection becomes unnecessary, and the light source 2 can be configured simply.
- the projection display apparatus 1 of the third embodiment is characterized in that the light selection unit 5 is not provided and that the light detection unit 6 is disposed on the opposite side of the light source 2 with respect to the light diffusion unit 4. This is different from the projection display device 1 of the embodiment. As shown in FIG. 6, the projection display apparatus 1 according to the third embodiment does not include the light selection unit 5. Further, the light detection unit 6 is disposed on the emission side of the light diffusion unit 4 so as to avoid the light path of the light L0 for projection display.
- the laser light emitted from each of the plurality of first emission units 21 a, 21 b, and 21 c is scanned by the predetermined region R of the light diffusion unit 4, is transmitted through the predetermined region R of the light diffusion unit 4, and is diffused.
- the first laser beam L1 which is a part of the laser beam diffused in the predetermined region R of the light diffusing unit 4 reaches the driver's eyes as light L0 for projection display.
- the second laser beam L2 which is the remaining portion of the laser beam diffused in the predetermined region R of the light diffusing unit 4 is an optical path of the first laser beam L1 (light for projection display L0) as a light for inspection.
- the light travels outside and is detected by the light detection unit 6.
- the light detection unit 6 is disposed at a position where the second laser light L2 can be detected even when the laser light emitted from the light source 2 is scanned at any position within the predetermined region R. .
- the first laser beam L1 which is a part of the laser beam emitted from each of the plurality of first emission units 21a, 21b, and 21c, is light for shadow display.
- the second laser beam L2 which is used as L0 and which is the remaining portion of the laser beam is used as a light for inspection.
- the control unit 8 executes projection display processing, detection processing of the second laser beam L2, and termination processing of the projection display Be done. Therefore, even with the projection display apparatus 1 of the third embodiment, it is possible to prevent a load from being exerted on the eyes of the viewer of the projection display.
- the light detection unit 6 transmits and diffuses the predetermined region R of the light diffusion unit 4 and travels outside the optical path of the first laser light L1. To detect This eliminates the need for an optical member for dividing the light path of the first laser light L1 and the light path of the second laser light L2, and therefore, the projection display apparatus 1 can have a simple configuration.
- the light source 2 includes a plurality of first emission portions 21a, 21b and 21c, and a second emission portion 22 may be included.
- the first emission units 21a, 21b, and 21c are, for example, a red laser diode, a green laser diode, and a blue laser diode, respectively, and emit the first laser light L1 for projection display.
- the wavelength range of the laser beam emitted from each of the first emission units 21a, 21b and 21c is a visible range.
- the second emitting unit 22 is, for example, an infrared laser diode, and emits a second laser beam L2 for inspection for grasping the state of the predetermined region R of the light diffusing unit 4.
- the wavelength range of the laser beam emitted from the second emission unit 22 is an infrared range.
- the first laser beam L1 emitted from each of the plurality of first emission units 21a, 21b, and 21c is scanned by the predetermined region R of the light diffusion unit 4 and transmitted through the predetermined region R of the light diffusion unit 4 to be diffused. Be done.
- the first laser beam L1 diffused in the predetermined region R of the light diffusing unit 4 reaches the driver's eyes as the light L0 for projection display.
- the second laser beam L2 emitted from the second emission unit 22 is scanned in the predetermined region R of the light diffusion portion 4 and is transmitted through the predetermined region R of the light diffusion portion 4 and diffused.
- a part of the second laser beam L2 diffused in the predetermined region R of the light diffusing unit 4 travels outside the optical path of the first laser beam L1 and is detected by the light detecting unit 6.
- the projection display apparatus 1 includes a light selection unit 17 instead of the light selection unit 5, and the light detection unit 6 includes a predetermined area R of the light diffusion unit 4 and the light selection unit 17. It differs from the projection display 1 of the second embodiment in that the transmitted second laser light L2 is detected.
- the light selection unit 17 is disposed on the opposite side of the light source 2 with respect to the light diffusion unit 4. More specifically, the light selection unit 17 is disposed at a position away from the light exit surface 4 b of the light diffusion unit 4 on the light emission side of the light diffusion unit 4.
- the light selection unit 17 has a function of reflecting a part of the laser light diffused in the predetermined region R of the light diffusion unit 4 and transmitting the remaining part of the laser light.
- the light detection unit 6 is disposed on the opposite side of the light diffusion unit 4 with respect to the light selection unit 17. The light detection unit 6 detects the laser light diffused in the predetermined region R of the light diffusion unit 4 and transmitted through the light selection unit 17.
- the laser light emitted from each of the plurality of first emission units 21 a, 21 b, and 21 c is scanned by the predetermined region R of the light diffusion unit 4, is transmitted through the predetermined region R of the light diffusion unit 4, and is diffused.
- the first laser light L1 which is a part of the laser light diffused in the predetermined region R of the light diffusion portion 4 is reflected by the light selection portion 17 and reaches the eye of the driver as light L0 for projection display.
- the second laser beam L2 which is the remaining portion of the laser beam diffused in the predetermined region R of the light diffusing unit 4, passes through the light selecting unit 17 and is detected by the light detecting unit 6 as inspection light. Ru.
- the first laser beam L1 which is a part of the laser beam emitted from each of the plurality of first emission units 21a, 21b, and 21c, is light for projection display
- the second laser beam L2 which is used as L0 and which is the remaining portion of the laser beam is used as a light for inspection.
- the control unit 8 executes projection display processing, detection processing of the second laser beam L2, and termination processing of the projection display Be done. Therefore, even with the projection display apparatus 1 according to the fourth embodiment, it is possible to prevent the eyes of the viewer of the projection display from being burdened.
- the projection display apparatus 1 of the fourth embodiment reflects the first laser beam L1 at a position separated from the emission surface 4b of the light diffusion unit 4 to the emission side of the light diffusion unit 4, and the second laser light L2.
- a light selection unit 17 is provided to transmit light.
- the light detection unit 6 detects the second laser light L2 transmitted through the light selection unit 17.
- the optical path of the first laser beam L1 and the optical path of the second laser beam L2 are divided, so the degree of freedom in the position where the light detection unit 6 is disposed can be increased.
- the light source 2 includes a plurality of first emission portions 21a, 21b, 21c, and a second emission portion 22 may be included.
- the first emission units 21a, 21b, and 21c are, for example, a red laser diode, a green laser diode, and a blue laser diode, respectively, and emit the first laser light L1 for projection display.
- the wavelength range of the laser beam emitted from each of the first emission units 21a, 21b and 21c is a visible range.
- the second emitting unit 22 is, for example, an infrared laser diode, and emits a second laser beam L2 for inspection for grasping the state of the predetermined region R of the light diffusing unit 4.
- the wavelength range of the laser beam emitted from the second emission unit 22 is an infrared range.
- the first laser beam L1 emitted from each of the plurality of first emission units 21a, 21b, and 21c is scanned by the predetermined region R of the light diffusion unit 4 and transmitted through the predetermined region R of the light diffusion unit 4 to be diffused. Be done.
- the first laser beam L1 diffused in the predetermined region R of the light diffusing unit 4 is reflected by the light selecting unit 17 and reaches the eye of the driver as light L0 for projection display.
- the second laser beam L2 emitted from the second emission unit 22 is scanned in the predetermined region R of the light diffusion portion 4 and is transmitted through the predetermined region R of the light diffusion portion 4 and diffused.
- a part of the second laser light L 2 diffused in the predetermined region R of the light diffusion unit 4 passes through the light selection unit 17 and is detected by the light detection unit 6.
- the scanning drive mirror 3 is not limited to an electromagnetically driven optical mirror manufactured by MEMS technology, and may be a galvano mirror.
- the drive system is not limited to the electromagnetic drive system, and may be another system such as electrostatic, piezoelectric or heat.
- the projection display apparatus 1 may separately include the scanning drive mirror 3 for the first laser beam L1 and the scanning drive mirror 3 for the second laser beam L2.
- the light diffusion unit 4 is not limited to the microlens array as long as it is an optical member having a function of diffusing light.
- a frost-type diffusion plate, an opal-type diffusion plate, or the like can be used as the light diffusion portion 4.
- the light selection unit 5 is provided at a position on the exit surface 4 b of the light diffusion unit 4 in the predetermined region R.
- the light selection unit 5 is not limited to the position on the emission surface 4 b of the light diffusion unit 4 in the predetermined region R, and for example, at a position away from the emission surface 4 b of the light diffusion unit 4 on the emission side of the light diffusion unit 4 It may be provided.
- the light selection unit 5 When the light selection unit 5 is provided at a position on the exit surface 4 b of the light diffusion unit 4 in the predetermined region R, the light selection unit 5 is directed from the exit surface 4 b of the light diffusion unit 4 to the exit side of the light diffusion unit 4 In any case in the case of being provided at a distant position, the second laser light L2 reflected by the light selection unit 5 is in the state of the entrance surface 4a and the exit surface 4b of the light diffusion unit 4 in the predetermined region R; In addition, the internal state of the light diffusion portion 4 in the predetermined region R is reflected.
- the light selection unit 5 may be provided at a position on the incident surface 4 a of the light diffusion unit 4 in the predetermined region R.
- the second laser beam L2 reflected by the light selection unit 5 reflects the state of the incident surface 4a of the light diffusion unit 4 in the predetermined region R.
- the light selection unit 5 is preferably an optical member having a function of diffusing the second laser beam L2 in addition to the function of reflecting the second laser beam L2.
- any configuration may be used as long as the light detection unit can detect the second laser beam through the predetermined region of the light diffusion unit.
- the second laser light passing through the predetermined area of the light diffusion portion means, for example, the state of the predetermined area of the light diffusion portion such that the second laser light L2 passes through the predetermined area R of the light diffusion portion 4 It means the reflected second laser light. Therefore, as long as the second laser light L2 detected by the light detection unit 6 is configured to reflect the state of the predetermined region R of the light diffusion unit 4, the light selection unit 5 is disposed at any position. As in the third embodiment, the light selection unit 5 may not be provided.
- the light detection unit 6 can detect the second laser beam L2 through the predetermined region R of the light diffusion unit 4, the presence or absence of the light selection unit 5 is recognized. Any configuration may be used regardless of the type.
- the light detection unit 6 is disposed outside the housing 7, but the light detection unit 6 is disposed inside the housing 7. It is also good. Thereby, the light detection unit 6 can be protected.
- the mirror 18 is disposed on the optical path A between the mirror 15 c and the scanning drive mirror 3 so that the light detection unit 6 faces the mirror 18.
- the mirror 18 is, for example, a mirror having a through hole provided on the optical path A.
- the first laser beam L1 and the second laser beam L2 traveling on the optical path A toward the scanning drive mirror 3 pass through the through holes of the mirror 18.
- the second laser light L 2 returned to the inside of the housing 7 is reflected by the mirror 18 and detected by the light detection unit 6.
- the second laser beam L2 returned to the inside of the housing 7 is diffused by the predetermined region R of the light diffusing unit 4, the first laser beam L1 and the second laser beam L2 directed to the scanning drive mirror 3 The optical axis is off. For this reason, the second laser beam L2 returned to the inside of the housing 7 is reflected by the portion other than the through hole of the mirror 18.
- the mirror 18 as described above may be disposed on the optical path A between the mirror 15a and the mirror 15b or between the mirror 15b and the mirror 15c. However, when disposed between the mirror 15 c and the scanning drive mirror 3, the light amount of the second laser beam L 2 can be sufficiently secured in the light detection unit 6 as compared with the case where the mirror 15 c is disposed elsewhere. Therefore, it is possible to reliably grasp a defect such as a scratch or the like generated in the predetermined region R of the light diffusion portion 4.
- the light detection unit 6 may be disposed at a position facing the window 7 a inside the housing 7 (see FIGS. 2 and 5). In this case, the light detection unit 6 can reliably detect the second laser light L2 transmitted through the window 7a among the second laser light L2 reflected by the light selection unit 5.
- the light detection unit 6 may be disposed on the opposite side of the scanning drive mirror 3 with respect to the mirror 16 on the extension of the light path A (see FIG. 2).
- the mirror 16 is an optical member having a function of reflecting a portion (for example, 50%) of the incident second laser beam L2 and transmitting the remaining portion (for example, 50%) of the incident second laser beam L2 .
- a part of the second laser beam L2 emitted from the second emission unit 22 is reflected by the mirror 16 and travels on the optical path A.
- a part of the second laser light L 2 returned to the inside of the housing 7 passes through the mirror 16 and is detected by the light detection unit 6.
- the light detection part 6 should just be a photodetector which has a sensitivity in the wavelength range of 2nd laser beam L2.
- a photodetector having sensitivity in the visible range is used as a light detection unit 6 can be used.
- the light detection unit 6 may be a semiconductor light detector.
- the projection display apparatus 1 may further include a shutter 19.
- the control unit 8 controls the shutter 19 on the light path of the first laser beam L1 scanned by the scanning drive mirror 3 as shown in FIG. You may arrange it.
- the shutter 19 is movable forward and backward along the optical path of the first laser beam L1 scanned by the scanning drive mirror 3. Also in this case, when a problem occurs in the predetermined region R of the light diffusion unit 4 during the projection display, the projection display can be reliably ended.
- the shutter 19 may be able to move back and forth on the optical path of the first laser light L1 transmitted through the predetermined region R of the light diffusion portion 4 (that is, the optical path of the light L0 for projection display).
- control unit 8 may reduce the output of the first laser beam L1 to each of the first emission units 21a, 21b, and 21c as the process of ending the projection display.
- control unit 8 may operate the scanning drive mirror 3 so that the first laser beam L1 is incident outside the predetermined region R of the light diffusion unit 4 as the process of ending the projection display.
- non-transmission processing is preferably performed outside the predetermined region R of the light diffusion portion 4 so that the first laser light L1 does not leak to the outside of the projection display device 1.
- a first modified example of the process performed by the control unit 8 (an example in which the detection process of the second laser light L2 is performed before projection display) will be described with reference to FIG.
- control unit 8 when the control unit 8 receives an input signal of projection display start, the control unit 8 starts the output of the second emission unit 22 (step S11). As a result, the second laser beam L2 is emitted from the second emission unit 22.
- step S11 the control unit 8 starts the operation of the scanning drive mirror 3 (step S12), and further, almost simultaneously with the steps S11 and S12, the control unit 8 starts the operation of the light detection unit 6 (Step S13).
- the scanning drive mirror 3 the swing of the mirror 3 a is started, and the second laser beam L 2 emitted from the light source 2 is projected on the predetermined region R of the light diffusion portion 4 for the first laser beam L 1 for display. Is scanned along the scan line of
- the second laser light L2 for inspection scanned by the scanning drive mirror 3 is diffused by the predetermined region R of the light diffusing unit 4 and is reflected by the light selecting unit 5.
- the second laser light L 2 reflected by the light selection unit 5 is transmitted through the light diffusion unit 4 again and detected by the light detection unit 6.
- the control unit 8 receives a detection value related to the light amount of the second laser light L2 from the light detection unit 6.
- the detection value is associated with the scanning position of the second laser beam L2 in the predetermined region R of the light diffusion unit 4.
- the control unit 8 determines the state of the predetermined region R of the light diffusion unit 4 based on the detected value (step S14). More specifically, the control unit 8 stores a reference value regarding the light amount of the second laser light L2 in association with the scanning position of the second laser light L2 within the predetermined region R of the light diffusion unit 4.
- the control unit 8 compares the detection value corresponding to the position with the reference value in accordance with the scanning position of the second laser light L2 in the predetermined region R of the light diffusion unit 4. When the detection value is present in the predetermined range from the reference value, the control unit 8 determines that the state of the predetermined region R of the light diffusion unit 4 is normal, and executes the projection display process (step S15). ).
- the control unit 8 starts output of each of the plurality of first emitting units 21a, 21b, 21c as execution of the projection display process.
- the light L0 for projection display is guided to the windshield 100 by the flat mirrors 11 and 12 and the concave mirror 13, and reaches the driver's eye as an image through the reflection on the windshield 100.
- the control unit 8 when the detection value exists outside the predetermined range from the reference value, the control unit 8 has a defect in the predetermined region R of the light diffusion portion 4 as the state of the predetermined region R of the light diffusion portion 4. It is determined that it has occurred, and projection display start prohibition processing is executed (step S16). The control unit 8 does not cause each of the first emission units 21a, 21b, and 21c to start emitting the first laser beam L1 even when the projection display start input signal is received as the projection display start prohibition process.
- the control unit 8 does not have to execute the detection process of the second laser beam L2 every time it receives an input signal of the projection display start, for example, every time the input signal of the projection display start is received a plurality of times.
- the detection process of the two laser beams L2 may be performed once.
- control unit 8 ends the projection display process (step S21).
- the control unit 8 stops the output of each of the plurality of first emitting units 21a, 21b, and 21c and stops the operation of the scanning drive mirror 3 as the projection display process is finished.
- control unit 8 starts the output of the second emission unit 22 (step S22).
- the second laser beam L2 is emitted from the second emission unit 22.
- step S23 the control unit 8 starts the operation of the scanning drive mirror 3 (step S23), and further, almost simultaneously with the steps S22 and S23, the control unit 8 starts the operation of the light detection unit 6 (Step S24).
- the control unit 8 starts the operation of the scanning drive mirror 3 (step S23), and further, almost simultaneously with the steps S22 and S23, the control unit 8 starts the operation of the light detection unit 6 (Step S24).
- the scanning drive mirror 3 the swing of the mirror 3 a is started, and the second laser beam L 2 emitted from the light source 2 is projected on the predetermined region R of the light diffusion portion 4 for the first laser beam L 1 for display. Is scanned along the scan line of
- the control unit 8 may continue the operation of the scanning drive mirror 3 until step S23 without stopping the operation of the scanning drive mirror 3 at the end of the projection display process.
- the second laser beam L2 for inspection scanned by the scanning drive mirror 3 is diffused by the predetermined region R of the light diffusing unit 4 and reflected by the light selecting unit 5.
- the second laser light L 2 reflected by the light selection unit 5 is transmitted through the light diffusion unit 4 again and detected by the light detection unit 6.
- the control unit 8 receives a detection value related to the light amount of the second laser light L2 from the light detection unit 6.
- the detection value is associated with the scanning position of the second laser beam L2 in the predetermined region R of the light diffusion unit 4.
- the control unit 8 determines the state of the predetermined region R of the light diffusion unit 4 based on the detected value (step S25). More specifically, the control unit 8 stores a reference value regarding the light amount of the second laser light L2 in association with the scanning position of the second laser light L2 within the predetermined region R of the light diffusion unit 4.
- the control unit 8 compares the detection value corresponding to the position with the reference value in accordance with the scanning position of the second laser light L2 in the predetermined region R of the light diffusion unit 4. When the detection value is present in the predetermined range from the reference value, the control unit 8 determines that the state of the predetermined region R of the light diffusion unit 4 is normal, and ends the process as it is.
- the control unit 8 when the detection value exists outside the predetermined range from the reference value, the control unit 8 has a defect in the predetermined region R of the light diffusion portion 4 as the state of the predetermined region R of the light diffusion portion 4. It is determined that it has occurred, and projection display start prohibition processing is executed (step S26). The control unit 8 does not cause each of the first emission units 21a, 21b, and 21c to start emitting the first laser beam L1 even when the projection display start input signal is received as the projection display start prohibition process.
- control unit 8 does not have to perform the detection process of the second laser beam L2 every time the projection display process ends, for example, detects the second laser beam L2 each time the projection display process ends a plurality of times The process may be performed once.
- the laser light emitted from the light source 2 of the projection display apparatus 1 is subjected to an inspection process or the like of the second laser light L2 before or after projection display.
- the light may be emitted to the outside, which may impose a burden on the eyes of the viewer of the projection display.
- the projection display apparatus 1 further include a shutter capable of advancing and retracting on the light path of the light L0.
- the control unit 8 executes, for example, a process not to operate the scanning drive mirror 3 even if an input signal for projection display start is received. Or, the process which does not move the shutter 19 mentioned above from the optical path of 1st laser beam L1 is performed.
- the projection display apparatus 1 mentioned above is not limited to a vehicle-mounted type, It can be used in various scenes, such as a helmet built-in type and spectacles type.
- a projection display device capable of preventing a person's eye of a projection display from being burdened.
- SYMBOLS 1 projection display apparatus, 2 ... light source, 3 ... drive mirror for drive (drive reflection part), 4 ... light diffusion part, 5, 17 ... light selection part, 6 ... light detection part, 8 ... control part, 19 ... shutter , L1: first laser light, L2: second laser light, R: predetermined area.
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Abstract
Description
[第1実施形態]
[第2実施形態]
[第3実施形態]
[第4実施形態]
Claims (8)
- 投影表示用の第1レーザ光及び検査用の第2レーザ光を出射する光源と、
前記光源から出射された前記第1レーザ光及び前記第2レーザ光を反射して走査する駆動反射部と、
前記駆動反射部によって走査された前記第1レーザ光を透過させて拡散する所定領域を有する光拡散部と、
前記光拡散部の前記所定領域を介した前記第2レーザ光を検出する光検出部と、
前記第2レーザ光の検出処理を実行し、前記光検出部の検出値に基づいて前記光拡散部の前記所定領域の状態を判断する制御部と、を備え、
前記制御部は、前記光拡散部の前記所定領域の状態として、前記光拡散部の前記所定領域に不具合が生じていると判断した場合には、投影表示の中止処理を実行する、投影表示装置。 - 前記制御部は、投影表示中において前記第2レーザ光の検出処理を実行し、前記光拡散部の前記所定領域に不具合が生じていると判断した場合には、前記投影表示の中止処理として、投影表示の終了処理を実行する、請求項1記載の投影表示装置。
- 前記制御部は、前記投影表示の終了処理として、前記光源に前記第1レーザ光の出射を停止させる、請求項2記載の投影表示装置。
- 前記駆動反射部によって走査された前記第1レーザ光の光路上又は前記光拡散部の前記所定領域を透過した前記第1レーザ光の光路上に進退可能なシャッタを更に備え、
前記制御部は、前記投影表示の終了処理として、前記第1レーザ光の光路上に前記シャッタを配置させる、請求項2記載の投影表示装置。 - 前記制御部は、投影表示前及び投影表示後の少なくとも一方において前記第2レーザ光の検出処理を実行し、前記光拡散部の前記所定領域に不具合が生じていると判断した場合には、前記投影表示の中止処理として、投影表示の開始禁止処理を実行する、請求項1記載の投影表示装置。
- 前記所定領域における前記光拡散部の入射面上の位置、前記所定領域における前記光拡散部の出射面上の位置、又は前記出射面から前記光拡散部の出射側に離れた位置において、前記第1レーザ光を透過させ、前記第2レーザ光を反射する光選択部を更に備え、
前記光検出部は、前記光選択部によって反射された前記第2レーザ光を検出する、請求項1~5のいずれか一項記載の投影表示装置。 - 前記光検出部は、前記光拡散部の前記所定領域を透過して拡散され且つ前記第1レーザ光の光路外を進行した前記第2レーザ光を検出する、請求項1~5のいずれか一項記載の投影表示装置。
- 前記光拡散部の前記所定領域を透過した前記第1レーザ光を反射し、前記光拡散部の前記所定領域を透過した前記第2レーザ光を透過させる光選択部を更に備え、
前記光検出部は、前記光選択部を透過した前記第2レーザ光を検出する、請求項1~5のいずれか一項記載の投影表示装置。
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EP16772058.0A EP3279716B1 (en) | 2015-03-31 | 2016-03-02 | Projection display device |
US15/562,008 US10197895B2 (en) | 2015-03-31 | 2016-03-02 | Projection display device |
CN201680018901.0A CN107430280B (zh) | 2015-03-31 | 2016-03-02 | 投影显示装置 |
JP2017509429A JP6309691B2 (ja) | 2015-03-31 | 2016-03-02 | 投影表示装置 |
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EP (1) | EP3279716B1 (ja) |
JP (3) | JP6309691B2 (ja) |
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