JP2015225244A - Projector and head-up display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector and a head-up display device that can suppress a striped pattern caused by a change in brightness in a vertical scanning direction from being visually recognized by a user.SOLUTION: A head-up display device (projector) 100 includes: a laser light source 11 that emits light of an image to be projected; an optical scanning part 13 that scans the light from the laser light source 11 in a horizontal scanning direction and a vertical scanning direction; a light detection part 19 for detecting brightness in the vertical scanning direction of the light scanned by the optical scanning part 13; and a control part 22 that performs, on the basis of a change in brightness in the vertical scanning direction based on the brightness detected by the light detection part 19, control to correct the brightness in a direction where a difference in brightness is reduced in the change in brightness.

Description

  The present invention relates to a projector and a head-up display device, and more particularly to a projector and a head-up display device that include an optical scanning unit.

  Conventionally, an image display device including an optical scanning unit is known (see, for example, Patent Document 1).

  Patent Document 1 discloses an image display device that includes a laser light source and a MEMS (Micro Electro Mechanical System) mirror (light scanning unit) that draws an image by scanning the laser light from the laser light source on a screen. ing. In this image display device, the MEMS mirror is a resonance type mirror, and is configured to draw an image on a screen by two-dimensionally scanning laser light in the horizontal direction and the vertical direction.

JP 2010-152066 A

  However, in the image display device described in Patent Document 1, unevenness may occur in the scanning speed in the vertical direction of the MEMS mirror due to interference of the harmonic component of the drive signal with the resonance frequency of the MEMS mirror. In this case, the luminance is relatively high at the scanning position where the scanning speed of the MEMS mirror is low, and the luminance is relatively low at the scanning position where the scanning speed of the MEMS mirror is high. As a result, a luminance change in the vertical direction (vertical scanning direction) occurs, and there is a problem that a striped pattern (striped pattern extending in the horizontal direction) resulting from the luminance change in the vertical direction is visually recognized by the user.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress a user from visually recognizing a striped pattern caused by a luminance change in the vertical scanning direction. It is an object to provide a projector and a head-up display device capable of performing the above.

  A projector according to a first aspect of the present invention is scanned by a light source unit that emits light of an image to be projected, an optical scanning unit that scans light from the light source unit in a horizontal scanning direction and a vertical scanning direction, and an optical scanning unit. Based on the luminance change in the vertical scanning direction based on the luminance detected by the light detection unit and the light detection unit for detecting the luminance in the vertical scanning direction of the reflected light, the luminance is reduced in the direction in which the luminance difference in the luminance change is reduced. A control unit that performs control for correction.

  In the projector according to the first aspect of the present invention, as described above, the light detection unit that detects the luminance is provided, and the luminance change based on the luminance change in the vertical scanning direction based on the luminance detected by the light detection unit. A control unit that performs control to correct the luminance in a direction in which the luminance difference decreases is provided. As a result, even if a luminance change in the vertical scanning direction occurs in the image due to a change in the scanning speed in the vertical scanning direction of the optical scanning unit, it is based on the luminance change based on the luminance detected by the light detection unit. Thus, the luminance is corrected in the direction in which the luminance change in the vertical scanning direction is reduced by the control unit, so that it is possible to suppress the striped pattern caused by the luminance change in the vertical scanning direction from being visually recognized by the user.

  In the projector according to the first aspect, preferably, the control unit corrects at least one of the scanning speed in the vertical scanning direction of the optical scanning unit and the light output of the light source unit in a direction in which the luminance difference in the luminance change is reduced. Thus, the control for correcting the luminance is performed. If comprised in this way, a brightness | luminance change can be easily suppressed only by controlling at least one of the scanning speed of the optical scanning part of the vertical scanning direction, or the light output of a light source part.

  In the configuration for correcting at least one of the scanning speed and the light output, preferably, the optical scanning unit is configured to scan one frame of light to form one still image. The detection unit is configured to detect a luminance change in the vertical scanning direction of a part of light scanned by the optical scanning unit, and the control unit is configured to detect light of one frame. Correct at least one of the scanning speed in the vertical scanning direction of the optical scanning unit or the light output of the light source unit in a direction in which the luminance difference in the luminance change of the entire still image becomes smaller based on the luminance change of a part of the light. Thus, the control for correcting the luminance is performed. Here, the stripe pattern resulting from the luminance change in the vertical scanning direction is generated in a plurality of strips along the horizontal scanning direction. Therefore, with the above configuration, even if the detection operation is not performed for all the frames, a part of the light for one frame (for example, one frame in the vertical scanning direction in only a part in the horizontal scanning direction). The position in the vertical scanning direction of the striped pattern generated in a plurality of bands can be estimated only by detecting the luminance change of the light), so that the luminance change of the entire still image can be corrected in a smaller direction. As a result, it is possible to suppress a user from visually recognizing a striped pattern caused by a luminance change in the vertical scanning direction with a simple configuration.

  In this case, preferably, the light scanning unit is configured to be able to scan light at a position where the user cannot visually recognize, in addition to the position where the user can visually recognize, and the light detection unit is not visible to the user. And is configured to detect a luminance change in the vertical scanning direction of a part of the light for one frame scanned by the optical scanning unit at a position where the user cannot visually recognize. Yes. If comprised in this way, the light (light which comprises an image) visually recognized by a user will be disturbed by arrange | positioning a photon detection part in the position where the user cannot visually recognize the light scanned by the optical scanning part. In addition, a change in luminance in the vertical scanning direction can be detected by the light detection unit.

  In the configuration in which at least one of the scanning speed and the light output is corrected, the control unit is preferably configured so that when the projector is activated, the luminance difference in the luminance change is reduced in the vertical scanning direction of the optical scanning unit. By correcting at least one of the scanning speed and the light output of the light source unit, the brightness is controlled to be corrected. With this configuration, since the correction is automatically performed when the projector is activated, it is possible to minimize the time during which the uncorrected image is projected and to ensure that the corrected image is displayed to the user. Can be provided.

  In the configuration for correcting at least one of the scanning speed and the light output, preferably, a temperature detection unit for detecting a temperature inside the projector is further provided, and the control unit is based on a temperature detection result by the temperature detection unit. The control is performed to correct the luminance by correcting at least one of the scanning speed in the vertical scanning direction of the optical scanning unit or the light output of the light source unit in a direction in which the luminance difference in the luminance change is reduced. Yes. Here, it is considered that the stripe pattern caused by the luminance change in the vertical scanning direction occurs at a position related to the frequency characteristic of the optical scanning unit. And since the frequency characteristic of an optical scanning part changes according to temperature, it is thought that the position where a stripe pattern generate | occur | produces also changes according to temperature. Therefore, with the configuration described above, even when the temperature inside the projector changes, correction can be made based on the change in luminance. Thereby, it is possible to suppress the striped pattern caused by the luminance change in the vertical scanning direction from being visually recognized by the user.

  In this case, preferably, the control unit performs control to acquire the temperature change amount inside the projector based on the temperature detection result by the temperature detection unit, and the acquired temperature change amount is equal to or greater than a predetermined threshold value. In such a case, the control for correcting the luminance is performed. With this configuration, unlike the case where the luminance change is acquired again when the absolute value of the temperature is equal to or greater than a predetermined threshold, the temperature change amount (that is, the relative value of the temperature) is equal to or greater than the predetermined threshold. In this case, since the brightness is corrected, the brightness can be reliably corrected according to the temperature change even when the temperature of the environment where the projector is installed is high.

  In the configuration for correcting at least one of the scanning speed and the light output, preferably, the luminance change includes a bright part having a relatively high luminance and a dark part having a relatively low luminance, and the control unit performs optical scanning. When the control for correcting the scanning speed of the part is performed, the control for increasing the scanning speed in the vertical scanning direction when scanning the position corresponding to the bright part of the luminance change and the position corresponding to the dark part of the luminance change are performed. By controlling to reduce the scanning speed in the vertical scanning direction when scanning the image, the brightness is controlled to be corrected in a direction in which the brightness difference between the bright part and the dark part in the brightness change is reduced. . According to this configuration, by controlling to increase the scanning speed in the vertical scanning direction when scanning the position corresponding to the bright part of the luminance change, the brightness of the bright part is decreased by the increase of the scanning speed. be able to. Further, by performing control to reduce the scanning speed in the vertical scanning direction when scanning the position corresponding to the dark part where the luminance changes, the luminance of the dark part can be increased as the scanning speed is reduced. As a result, it is possible to reliably correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced.

  In the configuration for correcting at least one of the scanning speed and the light output, preferably, the luminance change includes a bright part having a relatively high luminance and a dark part having a relatively low luminance, and the control unit includes a light source unit. When the control to correct the light output is performed, the brightness difference between the bright part and the dark part in the luminance change is reduced by performing the control to reduce the light output of the light source unit corresponding to the bright part of the luminance change. In such a direction, control for correcting the luminance is performed. If comprised in this way, by performing control which makes the light output of the light source part corresponding to the bright part of a brightness change small, the brightness | luminance of a bright part can be made small by the part which the light output becomes small. Thereby, it is possible to reliably correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced. In addition, the correction is performed by reducing the light output of the light source unit corresponding to the bright part of the luminance change, so that the correction is different from the case of correcting by the control of increasing the light output of the light source unit corresponding to the dark part of the luminance change. It is possible to prevent correction from being performed due to the light output of the previous light source unit being the maximum value. As a result, it is possible to reliably correct the luminance.

  A head-up display device according to a second aspect of the present invention includes a light source unit that emits light of an image corresponding to a virtual image visually recognized by a user, and optical scanning that scans light from the light source unit in a horizontal scanning direction and a vertical scanning direction. And a light detection unit for detecting luminance in the vertical scanning direction of the light scanned by the light scanning unit, and a luminance change based on the luminance change in the vertical scanning direction based on the luminance detected by the light detection unit. A control unit that performs control to correct the luminance in a direction in which the luminance difference decreases.

  In the head-up display device according to the second aspect of the present invention, as described above, the control for acquiring the luminance change is performed, and the luminance is reduced in the direction in which the luminance difference in the luminance change is reduced based on the acquired luminance change. A control unit for performing correction control is provided. Thereby, also in the head-up display device of the second aspect, it is possible to suppress the user from visually recognizing the striped pattern caused by the luminance change in the vertical scanning direction.

  According to the present invention, as described above, it is possible to provide a projector and a head-up display device that can suppress a user from visually recognizing a striped pattern caused by a luminance change in the vertical scanning direction.

It is a figure for demonstrating an example of the usage condition of the head-up display apparatus by 1st-3rd embodiment of this invention. It is a block diagram which shows the whole structure of the head-up display apparatus by 1st-3rd embodiment of this invention. It is a figure for demonstrating the projection area | region of the head-up display apparatus by 1st Embodiment of this invention. It is a figure for demonstrating the luminance change in the vertical scanning direction of the head-up display apparatus by 1st Embodiment of this invention. It is a schematic diagram for demonstrating the luminance change in the vertical scanning direction before the correction | amendment along A line of FIG. FIG. 5 is a schematic diagram for explaining a luminance change in the vertical scanning direction after correction along the line A in FIG. 4 according to the first embodiment of the present invention. It is a figure for demonstrating the speed correction table of the head-up display apparatus by 1st Embodiment of this invention. It is a flowchart for demonstrating the correction information creation process of the head-up display apparatus by 1st Embodiment of this invention. It is a flowchart for demonstrating the brightness change correction process of the head-up display apparatus by 1st Embodiment of this invention. It is a flowchart for demonstrating the brightness change correction process of the head-up display apparatus by 2nd Embodiment of this invention. It is a schematic diagram for demonstrating the luminance change in the vertical scanning direction after correction | amendment along the A line of FIG. 4 by 3rd Embodiment of this invention. It is a flowchart for demonstrating the correction information creation process of the head-up display apparatus by 3rd Embodiment of this invention. It is a flowchart for demonstrating the brightness | luminance change correction process of the head-up display apparatus by the modification of 1st Embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(First embodiment)
First, the configuration of a head-up display (HUD) device 100 according to the first embodiment of the present invention will be described with reference to FIG. The head-up display device 100 is an example of the “projector” in the present invention.

  The HUD device 100 according to the first embodiment of the present invention is a HUD device mounted on a transportation device such as an automobile 600 as shown in FIG.

  Specifically, the HUD device 100 is configured to project (irradiate) light that forms an image including information related to driving such as car navigation information and speed information of the automobile 600 onto a screen 601 such as a windshield. . Thereby, the user (driver) visually recognizes the light that is projected by the HUD device 100 and forms the image reflected on the screen 601, and visually recognizes the virtual image of the image in front of the screen 601 outside the automobile 600. It is possible.

  Next, a specific configuration of the HUD device 100 will be described with reference to FIG.

  The HUD device 100 includes three (red (R), green (G), and blue (B)) laser light sources 11 (11a, 11b, and 11c), three prisms 12 (12a, 12b, and 12c), and light. And a scanning unit 13. The HUD device 100 includes an image processing unit 14, a light source control unit 15, an LD (laser diode) driver 16, a mirror control unit 17, and a mirror driver 18. The HUD device 100 includes a light detection unit 19, a temperature detection unit 20, a storage unit 21, and a control unit 22. The laser light source 11 is an example of the “light source unit” in the present invention.

  The laser light source 11a is configured to irradiate the optical scanning unit 13 with red laser light through the three prisms 12a, 12b, and 12c. The laser light source 11b is configured to irradiate the optical scanning unit 13 with green laser light through the prisms 12b and 12c. The laser light source 11c is configured to irradiate the optical scanning unit 13 with blue laser light through the prism 12c.

  The three prisms 12 (12a, 12b, and 12c) respectively synthesize three laser beams (red (R), green (G), and blue (B)) so that the optical axes of the three laser beams are aligned. It is configured.

  The optical scanning unit 13 includes a horizontal light scanning unit 13a for scanning light from the laser light source 11 in the horizontal scanning direction and a vertical light scanning unit 13b for scanning light from the laser light source 11 in the vertical scanning direction. Contains. Both the horizontal light scanning unit 13a and the vertical light scanning unit 13b are configured by a MEMS (Micro Electro Mechanical System) mirror.

  The optical scanning unit 13 is configured to scan one frame of light to form one still image. The optical scanning unit 13 is configured to project a moving image by continuously forming a plurality of still images.

  In the optical scanning unit 13, the horizontal light scanning unit 13a reflects light from the laser light source 11 and in the horizontal scanning direction with respect to the screen 601 of the automobile 600 (see FIG. 1) via the vertical light scanning unit 13b. It is configured to scan. The vertical light scanning unit 13b is configured to reflect the light reflected by the horizontal light scanning unit 13a and scan the screen 601 of the automobile 600 in the vertical scanning direction. Thereby, the optical scanning unit 13 is configured to scan the light from the laser light source 11 in the horizontal scanning direction and the vertical scanning direction with respect to the screen 601. As a result, a still image or a moving image is projected (formed) on the screen 601.

  As shown in FIGS. 2 and 3, the optical scanning unit 13 is configured to be able to scan light not only to a position (region) where the user can visually recognize but also to a position (region) where the user cannot visually recognize. ing. Specifically, the position (region) that can be visually recognized by the user is a position (region) corresponding to the exit window 100a from which the light of the image projected on the screen 601 outside the HUD device 100 is emitted. The invisible position (region) is a position (region) inside the HUD device 100 and outside the emission window 100a.

  Based on the control by the control unit 22, the image processing unit 14 includes information regarding control of the laser light source 11 and information regarding control of the optical scanning unit 2 in the video signal input to the control unit 22, respectively. And output to the mirror control unit 17.

  The light source control unit 15 is configured to control the LD driver 16 based on the input information related to the control of the laser light source 11, and to control the laser light irradiation by the laser light source 11 (11a to 11c). . Specifically, the light source control unit 15 is configured to perform control of irradiating from the laser light sources 11a to 11c with a predetermined output in accordance with the scanning timing of the laser light scanning unit 13.

  The mirror control unit 17 controls the mirror driver 18 based on the input information relating to the control of the optical scanning unit 13, and causes the optical scanning unit 13 (the horizontal optical scanning unit 13a and the vertical optical scanning unit 13b) to change according to the resonance frequency. It is comprised so that the drive control may be performed.

  The light detection unit 19 includes an OEIC (Optical Electrical Integrated Circuit), and performs luminance change in the vertical scanning direction of the light scanned by the light scanning unit 13 (a plurality of striped stripe patterns along the horizontal scanning direction shown in FIG. 4). Configured to detect. Specifically, as shown in FIGS. 2 and 3, the light detection unit 19 is arranged at a position (area) where the user cannot visually recognize, and light is emitted at a position (area) where the user cannot visually recognize. It is configured to detect a luminance change (details will be described later) in the vertical scanning direction of part of the light for one frame scanned by the scanning unit 13.

  The temperature detection unit 20 includes a thermistor and is configured to detect the temperature inside the HUD device 100.

  The storage unit 21 includes a ROM that is a nonvolatile memory and a RAM that is a volatile memory. The storage unit 21 is configured to store various data and programs used by the control unit 22. Specifically, the storage unit 21 is configured to store a program corresponding to correction information creation processing and luminance change correction processing described later.

  The control unit 22 is configured to control each component of the HUD device 100. Hereinafter, the configuration of the control unit 22 relating to the luminance change in the vertical scanning direction of the HUD device 100 and the correction of the luminance change will be described.

  First, with reference to FIG. 4 and FIG. 5, the luminance change in the vertical scanning direction of the HUD device 100 will be described.

  As shown in FIG. 4, in the HUD device 100, the harmonic component of the drive signal interferes with the resonance frequency of the vertical light scanning unit 13b, thereby causing unevenness in the scanning speed of the MEMS mirror (vertical light scanning unit 13b). In this case, a stripe pattern is generated due to the luminance change in the vertical scanning direction. That is, the brightness is relatively high at the scanning position where the scanning speed of the MEMS mirror is low, and the brightness is relatively low at the scanning position where the scanning speed of the MEMS mirror is high, thereby causing a stripe pattern. . In this state, the luminance change in the vertical scanning direction appears as a plurality of striped stripe patterns extending along the horizontal direction. In FIG. 4, a relatively bright (bright) band is indicated by white, and a relatively low (dark) band is indicated by hatching.

  In FIG. 5, the detection waveform of the luminance change before correction | amendment by the control part 22 along the A line of FIG. 4 is shown. As shown in FIG. 5, the luminance change in the vertical scanning direction is detected by the light detection unit 19 as a vibration wave having a predetermined period. Hereinafter, the line passing through the average of the peak on the higher luminance side and the peak on the lower luminance side of the detected waveform is referred to as a center line 50, and the higher luminance side than the center line 50 is referred to as a bright portion having a relatively higher luminance. The side having a lower luminance than the center line 50 is referred to as a dark portion having a relatively low luminance. As the luminance difference between the bright part and the dark part in the luminance change is larger, the stripe pattern resulting from the luminance change in the vertical scanning direction is clearly recognized by the user.

  Therefore, in the first embodiment, as illustrated in FIG. 6, the control unit 22 performs control to acquire the luminance change in the vertical scanning direction from the light detection unit 19, and based on the acquired luminance change, It is configured to perform control to correct the luminance by correcting the scanning speed in the vertical scanning direction (that is, the scanning speed of the vertical light scanning unit 13b) in a direction in which the luminance difference between the bright part and the dark part in the change becomes smaller. Has been. Specifically, the control unit 22 scans the vertical light scanning unit 13b when scanning the position corresponding to the bright part of the luminance change (the position of the white band in FIG. 4) based on the acquired luminance change. The brightness is controlled by increasing the speed and by decreasing the scanning speed of the vertical light scanning unit 13b when scanning the position corresponding to the dark part of the brightness change (the hatched band position in FIG. 4). Control is performed to correct the luminance in a direction in which the luminance difference between the bright and dark portions in the change becomes smaller.

  More specifically, the control unit 22 performs control to create a speed correction table (see FIG. 7) of the scanning speed in the vertical scanning direction based on the acquired luminance change, and the created speed correction table Based on this, the vertical light scanning unit 13b is driven as described above to perform control to correct the luminance in a direction in which the luminance difference between the bright and dark portions in the luminance change is reduced.

  In the first embodiment, the control unit 22 changes the luminance of a part of the light detected by the light detection unit 19 in one frame of light scanned by the light scanning unit 13 (that is, as shown in FIG. 5). Based on the (luminance change), control is performed to correct the luminance by correcting the scanning speed of the vertical light scanning unit 13b so that the luminance difference between the bright part and the dark part in the luminance change of the entire still image becomes smaller. It is configured. Specifically, based on the luminance change of light for one frame in the vertical scanning direction in only a part of the horizontal scanning direction, the vertical direction is such that the luminance difference between the bright part and the dark part in the luminance change of the entire still image is reduced. By correcting the scanning speed of the optical scanning unit 13b, the brightness is controlled to be corrected.

  Here, an example of the speed correction table created by the control unit 22 will be described with reference to FIG. Here, an example in which the scanning speed in the vertical scanning direction is set for each horizontal line (scanning line in the horizontal scanning direction) of the optical scanning unit 13 will be described. The description will be made assuming that the maximum value of the scanning speed is 255. FIG. 7 shows only a part of the speed correction table (the part corresponding to the first to 25th horizontal lines) for ease of explanation.

  FIG. 7 shows a case where the first and 25th horizontal lines are detected as the brightest part of the bright part and the thirteenth horizontal line is detected as the darkest part of the darkest part. That is, the horizontal lines in the vicinity of the first and 25th horizontal lines are positions corresponding to the bright portions of the luminance change, and the horizontal lines in the vicinity of the thirteenth horizontal line are the positions corresponding to the dark portions of the luminance change. In the speed correction table of FIG. 7, the scanning speed of the vertical light scanning unit 13b when scanning the first and 25th horizontal lines, which are the brightest portions of the bright part, is set to be the fastest. In addition, the scanning speed of the vertical light scanning unit 13b when scanning the thirteenth horizontal line, which is the darkest part of the dark part, is set to be the smallest.

  The first to thirteenth (13th to 25th) horizontal lines correspond to the section from the bright part to the dark part, and in this section, the scanning speed in the vertical scanning direction is the first (25th) horizontal line. It is set so as to gradually decrease from the scanning speed when scanning the line. In FIG. 7, the 13th to 25th horizontal lines correspond to a section from the dark part to the bright part, and in this section, scanning is performed when the scanning speed in the vertical scanning direction scans the 13th horizontal line. It is set to gradually increase from the speed. Then, by driving the vertical light scanning unit 13b based on this speed correction table, it is possible to correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced. Note that the speed correction table of FIG. 7 is an example, and any other speed correction table may be used.

  By the way, it is thought that the stripe pattern resulting from the luminance change in the vertical scanning direction is generated at a position related to the frequency characteristic of the vertical light scanning unit 13b. And since the frequency characteristic of the vertical light scanning part 13b changes according to temperature, it is thought that the position where a stripe pattern generate | occur | produces also changes according to temperature. On the other hand, in the HUD device 100, the heat generated when each part is driven changes in a direction in which the temperature inside the HUD device 100 rises from when the HUD device 100 is activated. Therefore, when the temperature inside the HUD device 100 changes, the temperature of the vertical light scanning unit 13b changes and the position where the stripe pattern occurs also changes.

  In the first embodiment, the control unit 22 performs control to acquire the detection result of the temperature inside the HUD device 100 from the temperature detection unit 20, and based on the acquired temperature detection result, the temperature inside the HUD device 100 It is configured to perform control for acquiring the amount of change. And the control part 22 is control which acquires again the brightness | luminance change in the vertical scanning direction of the light scanned by the optical scanning part 13, when the acquired temperature change amount is more than a 1st threshold value. Is configured to do. Then, the control unit 22 corrects the scanning speed of the vertical light scanning unit 13b in a direction in which the luminance difference between the bright part and the dark part in the newly acquired luminance change is reduced based on the newly acquired luminance change. Thus, the control for correcting the luminance is performed. Note that the first threshold value is a threshold value for determining whether or not to acquire a luminance change again, and is a value that is appropriately determined by an experiment or the like at the time of design. The first threshold value is an example of the “predetermined threshold value” in the present invention. In the first embodiment, 1 ° C. is used as the first threshold value.

  In the first embodiment, the control unit 22 performs control to acquire a luminance change when the HUD device 100 is activated, and the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change decreases. It is comprised so that control which correct | amends may be performed. The control unit 22 is configured to perform control to determine whether or not the temperature inside the HUD device 100 has reached a steady state (a state in which the temperature change has almost disappeared) after the HUD device 100 is activated. Yes. Specifically, control unit 22 determines whether or not the temperature inside HUD device 100 has reached a steady state by determining whether or not the amount of temperature change inside HUD device 100 is greater than or equal to the second threshold value. It is comprised so that control which determines may be performed. More specifically, the control unit 22 performs control to determine that it is not in a steady state when the temperature change amount inside the HUD device 100 is equal to or greater than the second threshold value, and when the temperature change amount is equal to or greater than the second threshold value. When there is not, it is configured to perform control to determine that it is in a steady state. The second threshold value is a threshold value for determining whether or not the temperature inside the HUD device 100 has reached a steady state, and is a value that is appropriately determined by an experiment or the like during design. In the first embodiment, 3 ° C. is used as the second threshold value.

  Further, when the temperature inside the HUD device 100 is not in a steady state, the control unit 22 is configured to perform control to acquire a luminance change for each first number of frames and to perform control to correct the luminance. ing. As a result, even if the position of the stripe pattern changes from time to time depending on the temperature from the start-up of the HUD device 100 where the temperature rise is relatively rapid to the steady state, the brightness can be corrected quickly. is there. Note that the first number is a value that is appropriately determined by an experiment or the like at the time of design.

  In addition, when the temperature inside the HUD device 100 is in a steady state, the control unit 22 has a temperature change amount equal to or greater than the first threshold value every second number of frames greater than the first number. In such a case, control is performed to acquire a change in luminance, and control to correct the luminance is performed. As a result, in a steady state in which there is almost no temperature change, it is possible to reduce the frequency of performing the control to acquire the luminance change and correct the luminance, so the processing load of the control unit 22 is reduced by the reduced frequency. Is possible. Moreover, since it is thought that the position of a striped pattern hardly changes in a steady state, even if it reduces frequency, it can fully suppress that a striped pattern is visually recognized by a user. Note that the second number is a value that is appropriately determined by an experiment or the like at the time of design.

  Next, with reference to FIG. 8 and FIG. 9, the control related to the correction in the luminance change in the HUD device 100 will be described in detail. First, correction information creation processing in the HUD device 100 will be described with reference to a flowchart with reference to FIG.

  First, as shown in FIG. 8, in step S1, control for obtaining a luminance change in the vertical scanning direction is performed by the control unit 22 (see FIG. 2). Specifically, the control unit 22 performs control to acquire a luminance change in the vertical scanning direction detected by the light detection unit 19 (see FIG. 2) in an area invisible to the user. As a result, it is possible to determine in which position in the entire still image the horizontal stripes resulting from the luminance change in the vertical direction are generated.

  In step S2, the control unit 22 performs control for creating a speed correction table for the scanning speed in the vertical scanning direction. Specifically, based on the luminance change acquired in step S1, the scanning speed in the vertical scanning direction is corrected so that the luminance is corrected in a direction in which the luminance difference between the bright part and the dark part in the luminance change of the entire still image is reduced. The control unit 22 performs control for creating a speed correction table for correcting (that is, the scanning speed of the vertical light scanning unit 13b). Then, based on the created speed correction table, the vertical light scanning unit 13b (see FIG. 2) is driven, so that the luminance is reduced in the direction in which the luminance difference between the bright part and the dark part of the luminance change in the vertical scanning direction is reduced. Is corrected. Then, after executing the process of step S2, the correction information creation process is terminated.

  Next, luminance change correction processing in the HUD device 100 will be described based on a flowchart with reference to FIG.

  First, as shown in FIG. 9, in step S <b> 11, control for confirming activation of the HUD device 100 is performed by the control unit 22. That is, the control unit 22 confirms that the HUD device 100 has been switched from the off state to the on state.

  In step S <b> 12, the control unit 22 performs control to project an image of the first number of frames. Specifically, the control unit 22 performs control for forming (projecting) the number of still images corresponding to the first number of times by scanning the light of the first number of frames with the light scanning unit 13. At this time, since the luminance change is not corrected, a striped pattern shown in FIG. 4 is generated in the projected still image.

  In step S <b> 13, control for acquiring the temperature inside the HUD device 100 is performed by the control unit 22.

  In step S <b> 14, correction information creation processing (see FIG. 8) is executed by the control unit 22. That is, the control unit 22 performs control for acquiring the luminance change in the vertical scanning direction of the image projected in step S12 and for creating the speed correction table based on the acquired luminance change.

  In step S15, the control unit 22 performs control for projecting the image of the first number of frames again. At this time, since the luminance change is corrected, the still image is projected in a state where the stripe pattern is suppressed.

  In step S <b> 16, the control unit 22 again performs control for acquiring the temperature inside the HUD device 100.

  In step S <b> 17, the control unit 22 performs control to determine whether or not the temperature change amount is equal to or greater than the second threshold value (3 ° C.). That is, in step S17, the control unit 22 performs control for determining whether or not the temperature inside the HUD device 100 is in a steady state. In the first determination, it is determined whether or not the difference between the temperature inside the HUD device 100 acquired in step S13 and the temperature inside the HUD device 100 acquired in step S16 is equal to or greater than a second threshold value. The If it is equal to or greater than the second threshold value, it is determined that the steady state is not reached, and the process returns to step S14 to execute the correction information creation process. In the second and subsequent determinations, whether or not the difference between the temperature in the HUD device 100 acquired in the previous step S16 and the temperature in the HUD device 100 acquired in the current step S16 is greater than or equal to the second threshold value. Is determined. In the HUD device 100, the processes in steps S14 to S17 are repeated until the temperature inside the HUD device 100 reaches a steady state. In step S17, if the temperature change amount is not greater than or equal to the second threshold value, the process proceeds to step S18.

  In step S <b> 18, the control unit 22 performs control to project an image of the second number of frames greater than the first number.

  In step S <b> 19, control for acquiring the temperature inside the HUD device 100 is performed again by the control unit 22.

  In step S20, the control unit 22 performs control to determine whether or not the temperature change amount is equal to or greater than the first threshold value (1 ° C.). That is, in step S20, the control unit 22 performs control for determining whether or not to acquire a luminance change again in a steady state. In the first determination, the difference between the temperature in the HUD device 100 acquired in step S16 immediately before proceeding to step S18 and the temperature in the HUD device 100 acquired in step S19 is greater than or equal to the first threshold value. It is determined whether or not. If it is not greater than or equal to the first threshold value, it is determined that it is not necessary to acquire a luminance change again, and the process returns to step S18. In the second and subsequent determinations, whether or not the difference between the temperature in the HUD device 100 acquired in the previous step S19 and the temperature in the HUD device 100 acquired in the current step S19 is greater than or equal to the second threshold value. Is determined. And in HUD device 100, when the amount of temperature change inside HUD device 100 is not beyond the 1st threshold, processing of Steps S18-S20 is repeated. In step S20, if the temperature change amount is greater than or equal to the first threshold value, the process proceeds to step S21.

  In step S21, correction information creation processing (see FIG. 8) is executed by the control unit 22. As a result, control for acquiring the luminance change anew is performed, and control for correcting the luminance based on the acquired luminance change is performed by the control unit 22. Then, it returns to step S18 and the process of steps S18-S21 is repeated.

  In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the light detection unit 19 that detects the luminance change in the vertical scanning direction is provided, and the luminance difference in the luminance change is reduced based on the luminance change detected by the light detection unit 19. A control unit 22 that performs control to correct the luminance in the direction is provided. As a result, even if a luminance change in the vertical scanning direction occurs in the image due to a change in the scanning speed of the optical scanning unit 13 in the vertical scanning direction, based on the luminance change detected by the light detection unit 19. Since the luminance is corrected in the direction to reduce the luminance change in the vertical scanning direction by the control unit 22, the stripe change caused by the luminance change in the vertical scanning direction is suppressed from being visually recognized by the user as the luminance change is reduced. can do.

  In the first embodiment, as described above, the scanning speed in the vertical scanning direction of the optical scanning unit 13 (that is, the scanning speed of the vertical optical scanning unit 13b) is corrected in the direction in which the luminance difference in the luminance change is reduced. Thus, the control unit 22 is configured to perform control for correcting the luminance. Thereby, the luminance change can be easily suppressed only by controlling the light output of the laser light source 11.

  In the first embodiment, as described above, the optical scanning unit 13 is configured to scan one frame of light and form one still image. Then, the light detection unit 19 is configured to detect a luminance change in the vertical scanning direction of part of the light for one frame scanned by the light scanning unit 13. By correcting the scanning speed in the vertical scanning direction of the optical scanning unit 13 in a direction in which the luminance difference in the luminance change of the entire still image becomes smaller based on the luminance change of a part of the light for one frame. The control unit 22 is configured to perform control for correcting the luminance. Here, the stripe pattern resulting from the luminance change in the vertical scanning direction is generated in a plurality of strips along the horizontal scanning direction. Therefore, by configuring as described above, a part of the light for one frame (for example, as shown in FIG. 3, only in a part in the horizontal scanning direction, without performing the detection operation for all the frames). Since the position of the striped pattern generated in a plurality of strips in the vertical scanning direction can be estimated only by detecting the luminance change of one frame of light in the vertical scanning direction), the direction of reducing the luminance change of the entire still image is reduced. Can be corrected. As a result, it is possible to suppress a user from visually recognizing a striped pattern caused by a luminance change in the vertical scanning direction with a simple configuration.

  Moreover, in 1st Embodiment, in addition to the position which a user can visually recognize as mentioned above, the optical scanning part 13 is comprised so that light can be scanned also to the position which a user cannot visually recognize. Then, the luminance change in the vertical scanning direction of a part of the light for one frame scanned by the optical scanning unit 13 at the position where the user cannot visually recognize and at the position where the user cannot visually recognize. The light detection unit 19 is configured to detect. Thereby, by arranging the light detection unit 19 at a position where the light scanned by the light scanning unit 13 cannot be visually recognized by the user, the light (light constituting the image) visually recognized by the user is not disturbed. The light detector 19 can detect a change in luminance in the vertical scanning direction.

  In the first embodiment, as described above, when the HUD device 100 is activated, the scanning speed of the optical scanning unit 13 in the vertical scanning direction is corrected so that the luminance difference in the luminance change is reduced. The control unit 22 is configured to perform control for correcting the luminance. As a result, since the correction is automatically performed when the HUD device 100 is activated, it is possible to minimize the time during which the uncorrected image is projected and to reliably provide the corrected image to the user. can do.

  In the first embodiment, as described above, the scanning speed in the vertical scanning direction of the optical scanning unit 13 is corrected in a direction in which the luminance difference in the luminance change is reduced based on the temperature detection result by the temperature detecting unit 20. Thus, the control unit 22 is configured to perform control for correcting the luminance. Here, it is considered that the stripe pattern resulting from the luminance change in the vertical scanning direction occurs at a position related to the frequency characteristic of the optical scanning unit 13. And since the frequency characteristic of the optical scanning part 13 changes according to temperature, it is thought that the position where a stripe pattern generate | occur | produces also changes according to temperature. Therefore, by configuring as described above, even when the temperature inside the HUD device 100 changes, it is possible to acquire and correct the luminance change. Thereby, it is possible to suppress the striped pattern caused by the luminance change in the vertical scanning direction from being visually recognized by the user.

  Further, in the first embodiment, as described above, based on the temperature detection result by the temperature detection unit 20, control is performed to acquire the temperature change amount inside the HUD device 100, and the acquired temperature change amount is predetermined. The control unit 22 is configured to perform control to correct the luminance when the threshold value is equal to or greater than the threshold value. Thus, unlike the case where the brightness change is acquired again when the absolute value of the temperature is equal to or greater than the predetermined threshold, the brightness is increased when the temperature change amount (ie, the relative value of the temperature) is equal to or greater than the predetermined threshold. Since the correction is performed, even when the temperature of the environment where the HUD device 100 is installed is high, the luminance can be reliably corrected according to the temperature change.

  In the first embodiment, as described above, control is performed to increase the scanning speed in the vertical scanning direction when scanning the position corresponding to the bright part of the luminance change, and the position corresponding to the dark part of the luminance change is set. The control unit 22 is configured to perform control to correct the luminance in such a direction that the luminance difference between the bright portion and the dark portion in the luminance change is reduced by performing control to reduce the scanning speed in the vertical scanning direction when scanning. To do. Thus, by controlling to increase the scanning speed in the vertical scanning direction when scanning the position corresponding to the bright part of the luminance change, the brightness of the bright part can be reduced as the scanning speed increases. Further, by controlling to reduce the scanning speed in the vertical scanning direction when scanning the position corresponding to the dark part where the luminance changes, the luminance of the dark part can be increased as the scanning speed is reduced. As a result, it is possible to reliably correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. 1, FIG. 2, FIG. 8, and FIG. In the second embodiment, unlike the first embodiment in which it is determined whether the temperature inside the HUD device 100 is in a steady state based on the temperature inside the HUD device 100, the temperature inside the HUD device 200 is An example will be described in which it is determined whether or not is in a steady state based on the elapsed time from the startup of the HUD device 200. The HUD device 200 is an example of the “projector” in the present invention.

  A head-up display (HUD) device 200 according to the second embodiment of the present invention is mounted on a transportation device as shown in FIG. As shown in FIG. 2, the HUD device 200 includes a control unit 122. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Similar to the first embodiment, the control unit 122 performs control to acquire the luminance change in the vertical scanning direction from the light detection unit 19, and based on the acquired luminance change, the bright part and the dark part in the luminance change. The brightness is controlled to be corrected by correcting the scanning speed in the vertical scanning direction (that is, the scanning speed of the vertical light scanning unit 13b) in the direction in which the brightness difference decreases. In addition, when the HUD device 200 is activated, the control unit 122 performs control to acquire a luminance change, and performs control to correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced. It is configured as follows. The control unit 122 is configured to perform control to determine whether or not the temperature inside the HUD device 200 is in a steady state after the HUD device 200 is activated.

  Specifically, in the second embodiment, the control unit 122 determines whether or not the time that has elapsed since the HUD device 200 was activated has reached a predetermined time, whereby the temperature inside the HUD device 200 is increased. It is configured to perform control for determining whether or not a steady state has been reached. More specifically, the control unit 122 performs control to determine that it is not in a steady state when the time elapsed since the HUD device 200 has been started has not reached a predetermined time, and reaches the predetermined time. If so, it is configured to perform control to determine that it is in a steady state. The predetermined time is a time for determining whether or not the temperature inside the HUD device 200 has reached a steady state, and is a value that is appropriately determined by an experiment or the like at the time of design. For example, the time required for the HUD device 200 to reach a steady state is measured, and this value may be used. In the second embodiment, 60 minutes is used as the predetermined time.

  Next, with reference to FIG. 10, the luminance change correction process in the HUD device 200 will be described based on a flowchart. In addition, about the process same as the said 1st Embodiment shown in FIG. 9, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  First, in step S11, after the activation of the HUD device 200 (see FIG. 2) is confirmed, in step S31, a timer for measuring the time elapsed since the activation of the HUD device 200 is activated.

  In step S32, the control unit 122 (see FIG. 2) performs control to project the first number of frames. At this time, since the luminance change is not corrected, a striped pattern is generated in the projected still image.

  In step S33, correction information creation processing (see FIG. 8) is executed by the control unit 22. In the second embodiment, unlike the first embodiment, the determination as to whether or not the temperature inside the HUD device 200 is in a steady state is made based on the elapsed time since the startup of the HUD device 200. The control for acquiring the temperature inside the HUD device 200 before the steady state is obtained is not performed.

  In step S <b> 34, the control unit 122 performs control for projecting the image of the first number of frames again. At this time, since the luminance change is corrected, the still image is projected in a state where the stripe pattern is suppressed.

  In step S35, the control unit 122 performs control to determine whether or not the time measured by the timer has reached a predetermined time (60 minutes after activation). That is, in step S35, the control unit 122 performs control to determine whether or not the temperature inside the HUD device 200 is in a steady state. If the predetermined time has not been reached, it is determined that it is not in a steady state, and the process returns to step S33 to execute correction information creation processing. Then, in HUD device 200, the processes in steps S33 to S35 are repeated until the time measured by the timer reaches a predetermined time. If the time measured by the timer has reached a predetermined time in step S35, the process proceeds to step S18. The subsequent processing is the same as in the first embodiment.

  In addition, the other structure of 2nd Embodiment is the same as that of the said 1st Embodiment.

  In the second embodiment, the following effects can be obtained.

  In the second embodiment, as described above, the control unit 122 that performs control to correct the luminance in a direction in which the luminance difference in the luminance change becomes smaller is provided based on the luminance change detected by the light detection unit 19. Thereby, similarly to the first embodiment, it is possible to suppress the user from visually recognizing the striped pattern caused by the luminance change in the vertical scanning direction.

  Further, in the second embodiment, as described above, the temperature inside the HUD device 200 is in a steady state by determining whether or not the time elapsed since the HUD device 200 has been started has reached a predetermined time. The control unit 122 is configured to perform control to determine whether or not it has occurred. Thereby, it is possible to determine whether or not the temperature inside the HUD device 200 has reached a steady state by simply measuring the time elapsed since the HUD device 200 was activated.

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. 1, 2, 8, 11, and 12. In the third embodiment, by correcting the scanning speed of the vertical light scanning unit 13b, the luminance is corrected in the direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced, and the first and second embodiments described above. In contrast, an example will be described in which the luminance is corrected in a direction in which the luminance difference between the bright portion and the dark portion in the luminance change is reduced by correcting the light output of the laser light source 11.

  A head-up display (HUD) device 300 according to a third embodiment of the present invention is mounted on a transportation device as shown in FIG. Further, as shown in FIG. 2, the HUD device 300 includes a control unit 222. The same components as those in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. . The head-up display device 300 is an example of the “projector” in the present invention.

  In the third embodiment, the control unit 222 performs control to acquire the luminance change in the vertical scanning direction from the light detection unit 19, and based on the acquired luminance change, the luminance difference between the bright part and the dark part in the luminance change. In such a direction as to decrease the brightness, the light output of the laser light source 11 (11a, 11b and 11c) is corrected to perform control to correct the luminance. Specifically, as shown in FIG. 11, the control unit 222 corresponds to the bright part of the luminance change (when the bright part is scanned by the optical scanning unit 13) based on the acquired luminance change. By performing control to reduce the light output of the light source 11, control is performed to correct the luminance in a direction in which the luminance difference between the bright and dark portions in the luminance change is reduced.

  More specifically, in the third embodiment, the control unit 222 performs control to create an output correction table of the light output of the laser light source 11 based on the acquired luminance change, and the created output correction. Based on the table, laser light is emitted from the laser light source 11 (11a, 11b, and 11c) with a predetermined output, so that the luminance is corrected in a direction in which the luminance difference between the bright portion and the dark portion in the luminance change is reduced. Configured to do. The output correction table may be an output correction table in which the output of the laser light source 11 for each horizontal line of the optical scanning unit 13 is set as in the speed correction table shown in FIG. 7, or any other output correction table may be used. May be used.

  Next, correction information creation processing in the HUD device 300 will be described with reference to a flowchart with reference to FIG. In addition, about the process same as the said 1st Embodiment shown in FIG. 8, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  First, as shown in FIG. 12, after control for obtaining a luminance change in the vertical scanning direction is performed in step S1, an output correction table for the light output of the laser light source 11 (see FIG. 2) is set in step S2a. The control to be created is performed by the control unit 222 (see FIG. 2). Specifically, based on the luminance change acquired in step S1, the light of the laser light source 11 is corrected so that the luminance is corrected in a direction in which the luminance difference between the bright part and the dark part in the luminance change of the entire still image is reduced. Control for creating an output correction table for correcting the output is performed by the control unit 22. Then, by emitting laser light from the laser light source 11 with a predetermined output based on the created output correction table, the brightness is reduced in a direction in which the brightness difference between the bright part and the dark part of the brightness change in the vertical scanning direction is reduced. It is corrected. Then, after executing the process of step S2a, the correction information creation process is terminated. Then, the luminance change correction process including the correction information creation process is also executed in the HUD device 300.

  The remaining configuration of the third embodiment is similar to that of the aforementioned first embodiment.

  In the third embodiment, the following effects can be obtained.

  In the third embodiment, as described above, the control unit 222 that performs control to correct the luminance in the direction in which the luminance difference in the luminance change becomes smaller is provided based on the luminance change detected by the light detection unit 19. Thereby, similarly to the first embodiment, it is possible to suppress the user from visually recognizing the striped pattern caused by the luminance change in the vertical scanning direction.

  Further, in the third embodiment, as described above, by performing control to reduce the light output of the laser light source 11 (11a, 11b, and 11c) corresponding to the bright part of the luminance change, The control unit 222 is configured to perform control for correcting the luminance in a direction in which the luminance difference from the dark portion is reduced. Thus, by performing control to reduce the light output of the laser light source 11 corresponding to the bright part of the luminance change, the brightness of the bright part can be reduced by the amount of light output. Thereby, it is possible to reliably correct the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced. Further, since the correction is made by the control for reducing the light output of the laser light source 11 corresponding to the bright part of the luminance change, unlike the case of the correction by the control for increasing the light output of the laser light source 11 corresponding to the dark part of the luminance change. Further, it is possible to prevent the correction from being performed due to the light output of the laser light source 11 before the correction being the maximum value. As a result, it is possible to reliably correct the luminance.

  The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to third embodiments, the example in which the present invention is applied to the projector as the head-up display (HUD) device 100 (200, 300) is shown, but the present invention is not limited to this. The present invention is also applicable to projectors other than the projector as the HUD device. For example, the present invention may be applied to a projector that projects an image from an external device such as a PC or a television device.

  Moreover, although the said 1st-3rd embodiment showed the example which applied this invention to the HUD apparatus 100 (200, 300) mounted in the apparatus for transportation, this invention is not limited to this. The present invention can also be applied to HUD devices other than HUD devices mounted on transportation equipment.

  In the first and second embodiments, the luminance is corrected by correcting the scanning speed of the optical scanning unit 13 in the vertical scanning direction, and in the third embodiment, the light output of the laser light source 11 is corrected. Although an example is shown, the present invention is not limited to this. In the present invention, the luminance may be corrected by correcting both the scanning speed of the optical scanning unit in the vertical scanning direction and the light output of the laser light source.

  In the first embodiment, the example in which the luminance is corrected based on the luminance change in the vertical scanning direction of a part of the light for one frame has been described, but the present invention is not limited to this. In the present invention, the luminance may be corrected based on the luminance change in the vertical scanning direction of all the light of one frame.

  Moreover, in the said 1st Embodiment, while the light detection part 19 was arrange | positioned in the position which a user cannot visually recognize, and the brightness | luminance change was detected in this position, the present invention was not limited to this. In the present invention, the light detection unit may be arranged at a position where the user can visually recognize, and the luminance change may be detected at this position.

  In the first embodiment, the example in which the luminance change is detected by the light detection unit 19 and the control unit 22 acquires the luminance change detected by the light detection unit 19 is shown. However, the present invention is not limited to this. I can't. In the present invention, the luminance may be detected by the light detection unit, and the control unit 22 may acquire (calculate) the luminance change based on the luminance detected by the light detection unit.

  Moreover, in the said 1st Embodiment, when the HUD apparatus 100 was started, the brightness change was acquired and the example which corrected the brightness | luminance was shown, However, This invention is not limited to this. In the present invention, when the HUD device is activated, it is not necessary to acquire a luminance change and correct the luminance.

  In the first and second embodiments, the example in which the luminance change is acquired again when the temperature change amount in the HUD device 100 (200) is equal to or larger than the first threshold value is shown. Not limited to. In the present invention, when the temperature inside the HUD device is equal to or higher than a predetermined threshold value, the luminance change may be acquired again.

  In the first embodiment, the example in which light is scanned in the horizontal scanning direction by the horizontal light scanning unit 13a and in the vertical scanning direction by the vertical light scanning unit 13b has been described. However, the present invention is not limited to this. In the present invention, light may be scanned in the horizontal scanning direction and the vertical scanning direction by one optical scanning unit. In this case, the scanning speed in the vertical scanning direction of the optical scanning unit may be corrected.

  In the first embodiment, control is performed to increase the scanning speed of the vertical light scanning unit 13b when scanning the position corresponding to the bright part of the luminance change, and the position corresponding to the dark part of the luminance change is scanned. An example in which the control unit 22 performs control for correcting the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced by performing control to reduce the scanning speed of the vertical light scanning unit 13b at the time. Although shown, the present invention is not limited to this. In the present invention, the control for increasing the scanning speed of the vertical light scanning unit 13b when scanning the position corresponding to the bright part of the luminance change, or the vertical light scanning unit when scanning the position corresponding to the dark part of the luminance change. By performing only one of the controls for reducing the scanning speed of 13b, the control unit may perform control for correcting the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced.

  Further, in the third embodiment, by performing control to reduce the light output of the laser light source 11 corresponding to the bright part of the luminance change, the luminance is reduced in the direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced. Although the example which performed control which correct | amends by the control part 222 was shown, this invention is not limited to this. In the present invention, the control unit corrects the luminance in a direction in which the luminance difference between the bright part and the dark part in the luminance change is reduced by performing control to increase the light output of the laser light source corresponding to the dark part of the luminance change. May be performed. Further, by performing both control for increasing the light output of the laser light source 11 corresponding to the dark part of the luminance change and control for reducing the light output of the laser light source 11 corresponding to the bright part of the luminance change, the luminance Control for correcting the luminance in a direction in which the luminance difference between the bright part and the dark part in the change becomes smaller may be performed by the control unit.

  In the first and second embodiments, it is determined whether or not the temperature inside the HUD device 100 (200) has reached a steady state, and correction information creation processing is performed depending on whether or not the temperature is in a steady state. Although the example which performed different frequency was shown, this invention is not limited to this. In the present invention, the correction information creation process may be performed at the same frequency regardless of whether or not the temperature inside the HUD device is in a steady state.

  For example, as in the luminance change correction process of the modification shown in FIG. 13, the correction is performed when the temperature change amount is equal to or greater than the first threshold value regardless of whether the temperature inside the HUD device is in a steady state or not. The information creation process may be executed again. In the luminance change correction process of FIG. 13, after the activation of the HUD device is confirmed by the control unit in step S <b> 41, the image of the first number of frames is projected in step S <b> 42. In step S43, control for acquiring the temperature inside the HUD device is performed, and in step S44, correction information generation processing is executed. Then, after the image of the first number of frames is projected again in step S45, control for acquiring the temperature inside the HUD device is performed again in step S46. In step S47, the control unit determines whether or not the temperature change amount is equal to or greater than the first threshold value. If the temperature change amount is equal to or greater than the first threshold value, the process proceeds to step S44, and correction information creation processing is executed again. If the temperature change amount is not equal to or greater than the first threshold value, the process proceeds to step S45, and the processes of steps S45 to S47 are repeated.

  Moreover, in the said 1st-3rd embodiment, it demonstrated using the flow drive type flowchart which processes a process of the control part 22 (122, 222) of this invention in order along a process flow for convenience of explanation. However, the present invention is not limited to this. In the present invention, the processing operation of the control unit 22 (122, 222) may be performed by an event driven type (event driven type) process that executes a process for each event. In this case, it may be performed by a complete event drive type or a combination of event drive and flow drive.

11, 11a, 11b, 11c Laser light source (light source unit)
DESCRIPTION OF SYMBOLS 13 Light scanning part 13a Horizontal light scanning part 13b Vertical light scanning part 19 Light detection part 20 Temperature detection part 22,122,222 Control part 100,200,300 Head-up display apparatus (projector)

Claims (10)

A light source unit that emits light of an image to be projected;
An optical scanning unit that scans light from the light source unit in a horizontal scanning direction and a vertical scanning direction;
A light detection unit for detecting luminance in the vertical scanning direction of the light scanned by the light scanning unit;
And a control unit that performs control to correct the luminance in a direction in which the luminance difference in the luminance change is reduced based on the luminance change in the vertical scanning direction based on the luminance detected by the light detection unit.   The control unit corrects the luminance by correcting at least one of the scanning speed of the optical scanning unit in the vertical scanning direction or the light output of the light source unit in a direction in which the luminance difference in the luminance change is reduced. The projector according to claim 1, wherein the projector is configured to perform control. The optical scanning unit is configured to scan one frame of light to form one still image,
The light detection unit is configured to detect the luminance change in the vertical scanning direction of a part of the light for one frame scanned by the light scanning unit,
The control unit performs the vertical scanning of the optical scanning unit in a direction in which the luminance difference in the luminance change of the entire still image becomes smaller based on the luminance change of a part of the light for one frame. The projector according to claim 2, wherein the projector is configured to perform control for correcting luminance by correcting at least one of a scanning speed in a direction or an output of light from the light source unit. The light scanning unit is configured to be able to scan light to a position where the user cannot visually recognize, in addition to a position where the user can visually recognize,
The light detection unit is disposed at a position where the user cannot visually recognize, and at a position where the user cannot visually recognize, a part of the light of one frame scanned by the light scanning unit. The projector according to claim 3, wherein the projector is configured to detect the luminance change in the vertical scanning direction.   The control unit is configured to reduce at least one of a scanning speed of the optical scanning unit in the vertical scanning direction and a light output of the light source unit in a direction in which the luminance difference in the luminance change is reduced when the projector is activated. The projector according to claim 2, wherein the projector is configured to perform control for correcting luminance by correcting the brightness. A temperature detector for detecting the temperature inside the projector;
The control unit outputs the light speed of the light scanning unit in the vertical scanning direction or the light output of the light source unit in a direction in which the luminance difference in the luminance change is reduced based on the temperature detection result by the temperature detection unit. The projector according to claim 2, wherein the projector is configured to perform control for correcting luminance by correcting at least one of the above.   The control unit performs control to acquire a temperature change amount inside the projector based on a temperature detection result by the temperature detection unit, and when the acquired temperature change amount is a predetermined threshold value or more. The projector according to claim 6, wherein the projector is configured to perform control for correcting luminance. The brightness change includes a bright part having a relatively high brightness and a dark part having a relatively low brightness,
When performing control to correct the scanning speed of the optical scanning unit, the control unit performs control to increase the scanning speed in the vertical scanning direction when scanning the position corresponding to the bright part of the luminance change. And a direction in which the brightness difference between the bright part and the dark part in the brightness change is reduced by performing control to reduce the scanning speed in the vertical scanning direction when scanning the position corresponding to the dark part of the brightness change. The projector according to claim 2, wherein the projector is configured to perform control for correcting brightness. The brightness change includes a bright part having a relatively high brightness and a dark part having a relatively low brightness,
When the control unit performs control to correct the light output of the light source unit, the control unit performs control to reduce the light output of the light source unit corresponding to the bright part of the luminance change, thereby changing the luminance change. 9. The projector according to claim 2, wherein the projector is configured to perform control for correcting luminance in a direction in which a luminance difference between the bright portion and the dark portion in the image becomes smaller. A light source unit that emits light of an image corresponding to a virtual image visually recognized by the user;
An optical scanning unit that scans light from the light source unit in a horizontal scanning direction and a vertical scanning direction;
A light detection unit for detecting luminance in the vertical scanning direction of the light scanned by the light scanning unit;
A head-up display comprising: a control unit that performs control to correct the luminance in a direction in which the luminance difference in the luminance change is reduced based on the luminance change in the vertical scanning direction based on the luminance detected by the light detection unit. apparatus.

Images