JP2013072982A - Phosphor screen and scanning type display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phosphor screen capable of highly accurately detecting a scan position without increasing in size or causing complication of a device.SOLUTION: The phosphor screen includes: a plurality of phosphor regions that are provided at fixed intervals in an in-plane direction, absorb excited light and emit visible light; black regions for dividing a region in the plane into the plurality of phosphor regions; and a plurality of reflection parts provided on the black regions. Each of the plurality of reflection parts has an inclined face, and each inclined face is formed with a reflection surface. Each reflection surface reflects excited light incident from a predetermined direction. An inclination angle and an inclination direction of each reflection surface are so set that a reflection light reflected by each reflection surface enters a predetermined area on an opposing surface facing the surface, on which the plurality of phosphor regions and the black regions are formed.

Description

  The present invention relates to a phosphor screen in which phosphor regions containing phosphors are arranged at regular intervals in the in-plane direction, and a scanning display device including the phosphor screen.

  In general, in a scanning display device that scans excitation light and displays an image on a phosphor screen, various methods such as installation and replacement of the phosphor screen, vibration and distortion, environmental changes such as temperature and humidity, and aging Depending on the factors, the relative positional relationship between the scanning system and the phosphor screen changes, and as a result, it becomes difficult to irradiate the excitation light at an appropriate timing, leading to a reduction in image quality.

  In order to solve the above problem, it is necessary to detect the scanning position of the excitation light on the phosphor screen and adjust the irradiation timing of the excitation light based on the detection result.

  Patent Document 1 describes a technique for detecting the scanning position of excitation light on a phosphor screen. According to Patent Document 1, the phosphor screen has a plurality of phosphor regions periodically arranged in the in-plane direction and a plurality of retroreflectors formed between the phosphor regions. Each of the phosphor regions is composed of phosphor stripes of three colors of red, green and blue. The retroreflector is made of glass beads (ball beads) or a cube mirror.

  A scanning element is disposed on one side of the phosphor screen. The scanning element scans the excitation light in the horizontal direction (direction orthogonal to the phosphor stripe) and the vertical direction (direction parallel to the phosphor stripe).

  A light receiving element is provided at a position facing the scanning surface, and the retroreflective component of the excitation light is detected by the light receiving element. Based on the detection signal (index signal) of the retroreflective component output from the light receiving element, the irradiation timing of the excitation light to the retroreflector is detected, and the scanning position is determined based on the detected irradiation timing.

  Since the retroreflective component of the excitation light from the retroreflector has a diffusibility, an optical system for guiding the retroreflective component (diffused light) to the light receiving element is disposed around the scanning element.

  Around the scanning element, a driving mechanism for operating the scanning element, a holding mechanism and an adjusting mechanism for maintaining mechanical positional accuracy are also provided.

Japanese Patent No. 2676881 (Japanese Patent Laid-Open No. Hei 2-221995)

  In the device described in Patent Document 1, since it is necessary to arrange an optical system for guiding the retroreflective component to the light receiving element in the periphery of the scanning element, there is a problem that the apparatus becomes large and complicated.

  In addition, since the light receiving element having the optical system described above cannot efficiently detect the retroreflective component from the retroreflector, an index signal with sufficient intensity cannot be obtained, and scanning is performed with high accuracy. It is difficult to detect the position. The reason will be briefly described below.

  Since the retroreflector is configured to return the incident light in the incident direction, the retroreflective component from the retroreflector always goes to the scanning element. Depending on the positional relationship between a mechanism unit such as a drive mechanism or a holding mechanism provided around the scanning element and the light receiving element including the optical system described above, a part of the opening through which the mechanism unit takes in the retroreflective component in the light receiving element May be blocked. In this case, it is difficult to efficiently guide the retroreflective component to the light receiving element, and the strength of the index signal is reduced.

  Further, the retroreflective efficiency and the directivity of the retroreflective component depend on the structure of the retroreflector. For example, in a retroreflector made of ball beads, the retroreflectance decreases due to the influence of multiple reflection within the ball beads. Furthermore, since the retroreflective component is strongly diffused by the retroreflector itself, high directivity cannot be obtained. Due to these factors, the ratio of the retroreflective component passing through the aperture of the light receiving element is decreased, and as a result, the intensity of the index signal is decreased.

  In addition, although the intensity | strength of an index signal increases by enlarging opening of said light receiving element, in that case, an apparatus will enlarge.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a phosphor screen capable of detecting a scanning position with high accuracy without solving the above-described problems and increasing the size and complexity of the device, and a scanning display device using the same. There is to do.

In order to achieve the above object, the phosphor screen of the present invention comprises:
A plurality of phosphor regions that absorb excitation light and emit visible light, provided at regular intervals in the in-plane direction;
A black region that divides an in-plane region into a plurality of phosphor regions;
A plurality of reflective portions provided on the black region,
Each of the plurality of reflecting portions has an inclined surface, and each inclined surface is formed with a reflecting surface, and each reflecting surface reflects excitation light incident from a predetermined direction and reflects it by each reflecting surface. The inclination angle and the inclination direction of each reflection surface are set so that the reflected light is incident on a predetermined region of the surface facing the surface on which the plurality of phosphor regions and the black region are formed.

The scanning display device of the present invention comprises:
A phosphor screen;
An excitation light source that outputs excitation light;
A scanning element that scans excitation light on a phosphor screen;
A light receiving means that is provided at a position facing the scanning surface of the phosphor screen, detects reflected light of the excitation light from the reflecting surface, and outputs an index signal indicating the detection timing;
A controller that adjusts the light emission timing of the excitation light source or the amplitude of the drive signal that drives the scanning element based on the index signal from the light receiving means,
The phosphor screen
A plurality of phosphor regions that absorb excitation light and emit visible light, provided at regular intervals in the in-plane direction;
A black region that divides an in-plane region into a plurality of phosphor regions;
A plurality of reflective portions provided on the black region,
Each of the plurality of reflecting portions has an inclined surface, and each inclined surface is formed with a reflecting surface, and each reflecting surface reflects excitation light incident from a predetermined direction and reflects it by each reflecting surface. The inclination angle and the inclination direction of each reflection surface are set so that the reflected light is incident on a predetermined region of the surface facing the surface on which the plurality of phosphor regions and the black region are formed.

  According to the present invention, since the intensity of the index signal can be increased as compared with the case using the retroreflector, the scanning position can be detected with high accuracy.

  In addition, since it is not necessary to arrange an optical system for guiding the reflection component of the excitation light to the light receiving element in the periphery of the scanning element, it is possible to provide a scanning display device having a small size and a simple configuration.

1 is a block diagram illustrating a configuration of a scanning display device according to a first embodiment of the present invention. 3 is a timing chart showing a driving signal for a scanning element and an index signal output from a light receiving element in the scanning display device shown in FIG. 1. 2 is a timing chart showing changes in index signals when the relative positional relationship between a scanning element and a phosphor screen in the scanning display device shown in FIG. 1 is shifted in the horizontal scanning direction. It is a schematic diagram which shows the 1st Example of the structure of the reflective surface of the phosphor screen used with the scanning display apparatus shown in FIG. It is a schematic diagram which shows the 2nd Example of the structure of the reflective surface of the phosphor screen used with the scanning display apparatus shown in FIG. It is a schematic diagram which shows the 3rd Example of the structure of the reflective surface of the phosphor screen used with the scanning display apparatus shown in FIG. It is a schematic diagram which shows the 4th Example of the structure of the reflective surface of the phosphor screen used with the scanning display apparatus shown in FIG. It is a block diagram which shows the structure of the scanning-type display apparatus which is the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the scanning-type display apparatus which is the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the scanning-type display apparatus which is the 4th Embodiment of this invention. 11 is a timing chart showing drive signals for scanning elements and index signals output from the respective light receiving elements in the scanning display device shown in FIG. It is a schematic diagram for demonstrating the structure of the scanning display apparatus which is other embodiment of this invention. FIG. 13 is a schematic diagram showing a phosphor screen applied to the scanning display device shown in FIG. 12. It is a schematic diagram which shows the cross section of the convex-shaped reflective surface of the fluorescent substance screen shown in FIG. It is a schematic diagram which shows the cross section of the concave-shaped reflective surface of the fluorescent substance screen shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 shows a scanning display device according to a first embodiment of the present invention.

  Referring to FIG. 1, the scanning display device includes a laser light source 1, a scanning element 3, a phosphor screen 4, a light receiving element 8, and a control unit 9.

  The phosphor screen 4 includes a phosphor stripe 4R that emits red fluorescence, a phosphor stripe 4G that emits green fluorescence, a phosphor stripe 4B that emits blue fluorescence, and a black that absorbs or reflects incident light. It has a stripe 5 and a reflective surface 6.

  The phosphor stripes 4R, 4G, and 4B are periodically formed in one direction in a predetermined order. The phosphor stripes 4R, 4G, and 4B are partitioned by black stripes 5, respectively.

  The phosphor screen 4 is divided into a plurality of pixels, and each pixel includes three phosphor stripes 4R, 4G, and 4B and a black stripe 5 adjacent thereto. At least two pixels are targeted for detection of the index signal.

  The reflection surface 6 is provided on the black stripe 5 in the detection target pixel that is the detection target of the index signal. More specifically, the reflecting surface 6 is formed on a part of the black stripe 5 adjacent to a predetermined phosphor stripe among the phosphor stripes 4R, 4G, and 4B in the detection target pixel.

  The laser light source 1 is an excitation light source that outputs excitation laser light 2 that excites phosphors included in the phosphor stripes 4R, 4G, and 4B. The laser light source 1 includes, for example, a laser diode (LD).

  The scanning element 3 scans the excitation laser light 2 from the laser light source 1 on the phosphor screen 4 in two directions, a horizontal direction and a vertical direction. Here, the horizontal direction is a direction that intersects (or is orthogonal to) the phosphor stripes 4R, 4G, and 4B. The scanning element 3 is composed of a resonant mirror such as MEMS (Micro Electro Mechanical Systems). In addition, a polygon mirror or a galvanometer mirror may be used as the scanning element 3.

  The light receiving element 8 is made of, for example, a photodiode (PD), and is disposed so that the light receiving surface thereof faces the surface (scanning surface) of the phosphor screen 4 to which the excitation laser light 2 is irradiated. The light receiving element 8 detects the reflected laser light 7 from each reflecting surface 6 of the phosphor screen 4, and the intensity of the output signal changes according to the amount of the reflected laser light 7. The output signal of the light receiving element 8 is supplied to the control unit 9 as an index signal.

  The control unit 9 performs modulation control of the laser light source 1 based on a video signal supplied from an external video supply device such as a personal computer, and based on a synchronization signal (horizontal synchronization signal and vertical synchronization signal) synchronized with the video signal. By controlling the scanning element 3, an image based on the video signal is displayed on the phosphor screen 4. The modulation control of the laser light source 1 may be pulse modulation.

  Further, the control unit 9 emits a constant amount of excitation laser light 2 from the laser light source 1 and causes the scanning element 3 to perform scanning. Based on the index signal from the light receiving element 8, the excitation laser on the phosphor screen 4. The scanning position of the light 2 is detected. And the control part 9 controls the light emission timing of the laser light source 1 based on the detected scanning position.

  Next, the operation of the scanning display device of this embodiment will be described. Since the operation of displaying an image based on the video signal from the outside on the phosphor screen 4 is well known, the description of the operation is omitted. Hereinafter, the detection operation of the excitation light scanning position based on the index signal will be described in detail.

  In the phosphor screen 4, the reflection surface 6 formed in each pixel to be detected reflects the excitation laser light 2 from the scanning element 3, and the reflected laser light 7 that is the reflected light is different from the scanning element 3. The light receiving surface of the light receiving element 8 is arranged at the light collecting position. The inclination angle of the reflecting surface 6 varies depending on the in-plane position of the phosphor screen 4.

  In the detection operation of the scanning position, the control unit 9 emits the excitation laser beam 2 having a constant light amount from the laser light source 1 and controls the scanning of the excitation laser beam 2 by the scanning element 3. The light receiving element 8 supplies the control unit 9 with an index signal that is a result of detecting the reflected laser light 7 from each reflecting surface 6.

  FIG. 2 is a timing chart of the drive signal of the scanning element 3 and the index signal output from the light receiving element 8. In this example, the reflecting surface 6 is provided along the horizontal scanning direction.

  The drive signal for the scanning element 3 is a sinusoidal signal. In this case, the scanning speed of the excitation laser beam 2 on the phosphor screen 4 is the fastest at the center and becomes slower toward the end. The index signal output from the light receiving element 8 includes a pulse in which the reflected laser light 7 from each reflecting surface 6 is detected. The width of the pulse becomes shorter as the reflection surface 6 is formed closer to the center.

  The control unit 9 acquires the index signal shown in FIG. 2 from the light receiving element 8, and detects the scanning position of the excitation laser light 2 based on the index signal. In the index signal, each pulse indicates the timing at which the reflected laser beam 7 from each reflecting surface 6 is detected. Therefore, the rising timing of the pulse can be regarded as the timing at which the excitation laser beam 2 is irradiated on the reflecting surface 6, and the scanning position of the excitation laser beam 2 can be specified by detecting the timing. .

  The index signal pattern shown in FIG. 2 is a periodic pattern according to the drive signal of the horizontal scanning element that constitutes the scanning element 3. Therefore, the control unit 9 determines the relative positional relationship between the scanning element 3 and the phosphor screen 4 and the horizontal deflection angle of the scanning element 3 in addition to the information on the scanning position of the excitation laser 2 based on the index signal pattern. Can be detected.

  In the scanning display device of this embodiment, for example, when the relative positional relationship between the scanning element 3 and the phosphor screen 4 changes, the timing at which the excitation laser light 2 scans the phosphor stripes 4R, 4G, and 4B changes. . In this case, the spot diagram of the excitation laser beam 2 on the phosphor screen 4 is applied not only to the desired phosphor stripe but also to the phosphor stripe adjacent to the phosphor stripe.

  In the above case, both the desired phosphor stripe and the adjacent phosphor stripe are simultaneously irradiated with the excitation laser beam 2, and as a result, unnecessary fluorescence is emitted from the adjacent phosphor stripe, and the image quality is deteriorated by this unnecessary fluorescence. .

  For example, when it is desired to irradiate only the phosphor stripe 4R with the excitation laser light 2, the adjacent phosphor stripe 4G is simultaneously irradiated, and as a result, unnecessary green light is mixed in a portion where red is desired to be displayed.

  In the scanning display device of the present embodiment, the control unit 9 executes the above-described scanning position detection operation periodically or at an arbitrary timing. Here, the arbitrary timing includes timing of turning on the power of the scanning display device or timing of performing a predetermined input operation. And the control part 9 acquires the optimal timing which irradiates the excitation laser beam 2 to fluorescent substance stripe 4R, 4G, 4B based on the detected scanning position, and hold | maintains the acquired timing information. When an image based on the video signal is displayed on the phosphor screen 4, the control unit 9 controls the light emission timing of the laser light source 1 based on the held timing information. Thereby, the above-mentioned deterioration in image quality can be suppressed.

  Further, when the relative positional relationship between the scanning element 3 and the phosphor screen 4 changes, the pattern shape of the index signal output from the light receiving element 8, for example, the interval and width of the pulse of the index signal changes. The controller 9 can detect the displacement of the position of the excitation laser light 2 on the phosphor screen 4 based on such a change in the pattern shape of the index signal.

  Specifically, the control unit 9 performs the above-described scanning position detection operation periodically or at an arbitrary timing, and holds the pattern shape of the index signal. When displaying an image based on the video signal on the phosphor screen 4, the control unit 9 determines the pattern shape of the index signal acquired from the light receiving element 8 during the display operation, and the pattern shape of the held index signal. When a predetermined difference (difference causing image quality degradation) is detected, the modulation timing of the laser light source 1 or the driving signal of the scanning element 3 is adjusted.

  FIG. 3 shows the case where the phosphor screen 4 provided with the reflecting surface 6 near the center on the horizontal line and near both left and right ends is used, and the relative positional relationship between the scanning element 3 and the phosphor screen 4 is horizontal scanning. The change of the index signal when shifted in the direction is shown.

  When the scanning element 3 is driven by a sine wave drive signal, the scanning speed near the center of the screen is faster than near both ends of the screen. For this reason, the pulse width of the index signal near the center of the screen is shorter than the pulse width of the index signal near both ends of the screen.

  For example, when the relative position of the scanning element 3 and the phosphor screen 4 is shifted in the horizontal direction, the pulse interval of the index signal, for example, the pulse interval P3 of the index signal near both ends of the screen is normal as shown in FIG. It is smaller than the pulse interval P1 of the index signal near both ends of the screen at the time (there is no shift). In addition, the pulse width of the index signal, for example, the pulse width P4 of the index signal near the center of the screen is larger than the pulse width P2 of the index signal near the center of the screen at normal time (no shift). The control unit 9 calculates the shift amount of the relative position between the scanning element 3 and the phosphor screen 4 based on these changes, and the laser light source 1 so as to irradiate the desired phosphor stripe with the excitation laser beam 2. The modulation timing or the driving signal of the scanning element 3 is adjusted. In adjusting the modulation timing of the laser light source 1, control is performed such that the modulation timing is advanced or delayed, and control is performed such that the pulse width of the drive signal of the laser light source 1 is increased or decreased. In adjusting the drive signal of the scanning element 3, the amplitude of the drive signal is controlled to adjust to a predetermined deflection angle.

  Next, a specific configuration of the reflecting portion having the reflecting surface 6 will be described.

  Based on the position of the pixel where the index signal is desired to be detected and the position where the light receiving element 8 is disposed, the tilt angle required for the horizontal and vertical directions of the reflecting surface 6 is determined.

(First Example of Reflector)
FIG. 4 shows a first embodiment of the reflecting portion including the reflecting surface 6.

  The reflecting portion shown in FIG. 4 is formed in a part of the black stripe 5 and the reflecting surface 6 is formed over the entire stripe width direction (horizontal direction). A part of the reflection surface 6 protrudes from the surface of the black stripe 5, and the remaining part is formed in a portion where the black stripe 5 is dug down with an inclination from the surface. As described above, by making a part of the reflection surface 6 higher than the surface of the black stripe 5, the reflection surface 6 having a large area and a large inclination angle can be formed.

  In addition, in the reflection part shown in FIG. 4, a part of excitation laser beam 2 which irradiates the fluorescent substance stripe adjacent to the black stripe 5 is interrupted by the reflective part, and the luminous efficiency in the fluorescent substance stripe decreases, Image quality may be degraded. In order to suppress the deterioration of the image quality, the reflection unit may have the following configuration.

  The phosphor stripes 4R, 4G, and 4B are long in the vertical scanning direction. Therefore, in order to maximize the ratio of the irradiation area of the excitation laser 2 to the pixel area in each of the phosphor stripes 4R, 4G, and 4B, the spot shape of the excitation laser light 2 on the phosphor screen 4 is the phosphor stripe. It is desirable to have an elliptical shape extending in the longitudinal direction. In order to generate the elliptical excitation laser light 2, an optical system for beam shaping may be included in the laser light source 1.

  The excitation laser beam 2 may be, for example, a single mode laser or a multimode laser. The direction orthogonal to the phosphor stripe may be a single mode, and the direction parallel to the phosphor stripe may be a single mode or a multimode. In a configuration in which the direction parallel to the phosphor stripe is multimode, the spot shape of the excitation laser light 2 on the phosphor screen 4 is preferably an elliptical shape extending in the longitudinal direction of the phosphor stripe.

  In the above case, for example, if the reflecting surface 6 is formed to be square on the black stripe 5, the ratio of the area blocked by the reflecting portion to the irradiation area of the excitation laser light 2 on the black stripe 5 can be reduced. it can. As a result, it is possible to suppress a deterioration in image quality caused by part of the excitation laser light 2 that irradiates the adjacent phosphor stripes being blocked by the reflecting portion.

(Second embodiment of the reflecting portion)
FIG. 5 shows a second embodiment of the reflecting portion including the reflecting surface 6.

  The reflecting portion shown in FIG. 5 is also formed in a part of the black stripe 5, but the reflecting surface 6 is formed in a portion where the black stripe 5 is dug down from the surface thereof. In this case, the reflective surface 6 is located below the surface of the black stripe 5. According to this configuration, it is possible to avoid the problem that the image quality is deteriorated due to a part of the excitation laser light 2 being blocked by the reflecting portion, as in the example shown in FIG.

(Third embodiment of the reflector)
FIG. 6 shows a third embodiment of the reflecting portion including the reflecting surface 6.

  The reflection part shown in FIG. 6 is also formed in a part of the black stripe 5, but the entire reflection surface 6 is formed at a position higher than the surface of the black stripe 5.

  The inclination angle of the reflecting surface 6 is determined by the relative positional relationship between the scanning element 3, the phosphor screen 4 and the light receiving element 8, and the scanning angle of the scanning element 3.

  Below, an example of projection conditions is given and the inclination angle of the reflective surface 6 in the projection conditions is demonstrated.

  In a state where the scanning element 3 is arranged facing the phosphor screen 4 and scanning in the horizontal direction and the vertical direction is not performed, that is, in a state where no signal is input to the scanning element 3, the excitation laser light 2 Is set to be the center of the image display area on the phosphor screen 4. Such setting projection is called front projection.

  In the scanning element 3, the half angle of the scanning angle of the horizontal scanning mirror that performs scanning in the horizontal direction is 10 degrees, and the half angle of the scanning angle of the vertical scanning mirror that performs scanning in the vertical direction is 9 degrees. Since the excitation laser beam 2 is deflected by each scanning mirror at an angle twice the scanning angle, the horizontal scanning half angle with respect to the phosphor screen 4 is 20 degrees and the vertical scanning half angle is 18 degrees. .

  The distance (projection distance) between the scanning element 3 and the phosphor screen 4 is 100 mm. The light receiving element 8 is disposed 20 mm below the line connecting the scanning element 3 and the center of the image display area of the phosphor screen 4 in the vertical direction.

  The distance between the light receiving element 8 and the phosphor screen 4 is 90 mm. The widths of the phosphor stripes 4R, 4G, 4B and the black stripe 5 are all 150 μm.

  The light receiving element 8 can receive the reflected laser light 7 at a position that does not cause interference with the drive unit of the scanning element 3 in a space other than the scanning range (projection space) of the excitation laser light 2 by the scanning element 3. It is arranged in the position.

  Under the above projection conditions, the inclination angle of the reflecting surface 6 for deflecting the excitation laser light 2 to the light receiving element 8 is maximized when the reflecting portions are formed at the left and right ends of the uppermost side of the screen display area. In this case, the angle of inclination of the reflecting surface 6 in the horizontal direction (direction perpendicular to the phosphor stripe) is 25 degrees, and the angle of inclination of the reflecting surface 6 in the vertical direction (direction parallel to the phosphor stripe) is 27 degrees. .

  In the reflection part having the above inclination angle, the width when viewed from the direction perpendicular to the surface of the black stripe 5 (width in the horizontal scanning direction) is the same as the width of the black stripe 5 and is 150 μm long in the vertical direction. When the reflective surface 6 having a thickness is formed, the height of the reflective part is 146.3 mm at the maximum.

(Fourth embodiment of the reflecting portion)
FIG. 7 shows a fourth embodiment of the reflecting portion including the reflecting surface 6.

  In the reflecting portion shown in FIG. 7, as in the second embodiment, the reflecting surface 6 is formed in a portion where a part of the black stripe 5 is dug down with an inclination from the surface, but viewed from above. In this case, the width of the reflecting surface 6 matches the width of the black stripe 5.

  The level difference between the surface of the phosphor stripes 4R, 4G, and 4B and the surface of the black stripe 5 is 100 μm. The projection conditions are the same as the projection conditions of the third embodiment. When the reflection part is formed at the left and right ends of the uppermost side of the screen display region, the inclination angle of the reflection surface 6 in the horizontal direction is 25 degrees, and the inclination angle of the reflection surface 6 in the vertical direction is 27 degrees.

  Since the entire reflecting surface 6 is located below the surface of the black stripe 5, a part of the excitation laser beam 2 described in the reflecting portion of the first embodiment shown in FIG. Can be avoided.

  According to the scanning display device of the present embodiment described above, the following operational effects are obtained.

  Since the reflected laser light 7 from the reflecting surface 6 is directed to the light receiving element 8 disposed at a position different from the scanning element 3, the mechanism provided around the scanning element 3 does not block the reflected laser light 7. . In addition, the reflected laser light 7 has higher directivity than the retroreflected light. Therefore, the intensity of the index signal can be increased and the scanning position can be detected with high accuracy as compared with the case using the retroreflector.

  In addition, since it is not necessary to arrange an optical system for guiding the reflection component of the excitation light to the light receiving element in the periphery of the scanning element 3, it is possible to provide a scanning display device having a small size and a simple configuration.

  In particular, when a scanning element having a resonance structure is used as the scanning element 3, it is necessary to compensate for variations in scanning performance due to changes in the scanning environment. For example, when the temperature around the scanning element 3 changes, the resonance frequency of the scanning element 3 changes and the scanning angle changes. In such a case, when the driving parameter of the scanning element 3 is changed by changing the blanking period in order to keep a certain scanning range (area) on the phosphor screen 4, the phosphor stripes 4R, 4G are changed. 4B scan speed changes. That is, before and after the environmental change, the timing of modulating the laser light source 1 and the drive signal of the scanning element 3 cannot be synchronized, and color crosstalk occurs between the adjacent phosphor stripes, thereby degrading the image quality. There is a case. In addition, when the relative positional relationship between the scanning element 3 and the phosphor screen 4 is changed after the scanning element 3 and the phosphor screen 4 are installed, such as parallel movement, inclination, and rotation of the phosphor screen 4, the excitation laser is used. Since the regularity with which the light 2 scans the phosphor stripes changes, color crosstalk may occur and image quality may deteriorate. In order to avoid degradation of image quality due to these environmental changes, an index signal is obtained from a plurality of pixels of the phosphor screen 4, and based on the index signal, the scanning position of the scanning element 3 and the driving parameters of the scanning element 3 are obtained. It is effective to calculate accurately.

  When the tilt angle required for the reflecting surface 6 increases as the scanning angle of the scanning element 3 increases and the arrangement conditions of the light receiving elements, the reflecting surface structure is not formed higher than the black stripe surface and reflected. It becomes difficult to form the surface 6 with a sufficient area. Therefore, when the excitation laser beam 2 is scanned at a constant scanning angle, the relative positional relationship among the scanning element 3, the reflecting surface 6, and the light receiving element 8 is adjusted so that the maximum inclination angle required for the reflecting surface 6 is increased. It is effective to keep it small.

(Second embodiment)
FIG. 8 is a diagram showing a configuration of a scanning display device according to the second embodiment of the present invention. In FIG. 8, the state which looked at the scanning-type display apparatus from the upper side is shown typically. In FIG. 8, the direction perpendicular to the paper surface is the vertical scanning direction, and the left-right direction is the horizontal scanning direction.

  The scanning angle of the scanning element 3, the relative positional relationship between the scanning element 3 and the phosphor screen 4, the position of the reflecting surface 6, and the positional relationship in the vertical direction between the light receiving element 8 and the scanning element 4 are the same as those shown in FIG. is there. However, in the present embodiment, the distance between the light receiving element 8 and the phosphor screen 4 is larger than that shown in FIG.

  The inclination angle of the reflecting surface 6 varies depending on the position where the index signal is detected. The inclination angle of each reflecting surface 6 is set so that all of the reflected laser light 7 deflected by each reflecting surface 6 is collected on the light receiving surface of the light receiving element 8.

  When the distance between the light receiving element 8 and the phosphor screen 4 is increased, the required value of the tilt angle with respect to the reflecting surface 6 is relaxed by the increased distance. In the present embodiment, the following problem is solved by using the relaxation of the required value of the tilt angle.

  When the tilt angle required for the reflecting surface 6 is large, it is necessary to form part or all of the reflecting surface 6 higher than the surface of the black stripe 5. In consideration of the ease of processing, the structure of the reflecting surface in which the portion dug down from the surface of the black stripe 5 and the portion formed higher than the surface of the black stripe 5 are mixed, for example, the structure of the reflecting portion shown in FIG. Is not preferred.

  Further, in the structure in which the entire reflecting surface 6 is formed at a position lower than the surface of the black stripe 5 as in the structure of the reflecting portion shown in FIG. 5 and the structure of the reflecting portion shown in FIG. The area of the reflecting surface 6 is reduced. When the area of the reflecting surface 6 is reduced, the pulse width of the received light signal of the reflected laser light 7 from the reflecting surface 6 is reduced. As a result, when the driving conditions change due to environmental changes or the like, the pulse is changed before and after the change. The accuracy of detecting the difference in the pattern shape is reduced. Further, a large inclination angle is not preferable because it is difficult to process.

  In the present embodiment, since the distance between the light receiving element 8 and the phosphor screen 4 is long, the required value of the tilt angle with respect to the reflecting surface 6 is relaxed. By relaxing the required value of the tilt angle, the tilt angle of the reflecting surface 6 can be reduced and the area of the reflecting surface 6 can be increased as compared with the first embodiment. Therefore, it is possible to improve the accuracy of the scanning position based on the index signal.

(Third embodiment)
FIG. 9 is a diagram showing a configuration of a scanning display apparatus according to the third embodiment of the present invention. FIG. 9 schematically shows the scanning display device as viewed from above. In FIG. 9, the direction perpendicular to the paper surface is the vertical scanning direction, and the left-right direction is the horizontal scanning direction.

  The scanning angle of the scanning element 3 and the relative positional relationship between the scanning element 3 and the phosphor screen 4 are the same as those shown in FIG. The distance between the light receiving element 8 and the phosphor screen 4 may be longer or shorter than that shown in FIG.

  The phosphor screen 4 has a first area on the left side from the center as a reference and a second area on the right side from the center, and a plurality of reflecting surfaces 6 are provided in the first area. ing.

  The light receiving element 8 is disposed so as to face the first region of the phosphor screen 4. When the scanning display device is viewed from the side, the light receiving element 8 may be disposed at the same height as the scanning element 3 or may be disposed at a different height from the scanning element 3.

  The inclination angle of the reflecting surface 6 varies depending on the position where the index signal is detected. The angle of inclination of each reflecting surface 6 is set so that all of the reflected laser light 7 deflected by each reflecting surface 6 is focused on the light receiving element 8.

  According to the present embodiment, by limiting the region where the reflection surface 6 is formed, the required value of the inclination angle with respect to the reflection surface 6 is relaxed.

  In addition, you may form the reflective surface 6 in 2nd area | region instead of 1st area | region. In this case, the light receiving element 8 is disposed so as to face the second region.

  Moreover, the area | region where the reflective surface 6 is formed may be an area | region smaller than a 1st or 2nd area | region.

(Fourth embodiment)
FIG. 10 is a diagram showing a configuration of a scanning display device according to the fourth embodiment of the present invention. FIG. 10 schematically illustrates the scanning display device as viewed from above. In FIG. 10, the direction perpendicular to the paper surface is the vertical scanning direction, and the left-right direction is the horizontal scanning direction.

  In the scanning display device according to the present embodiment, the reflecting surface 6 is formed in each of the first and second regions of the phosphor screen 4, and instead of the light receiving device 8, a light receiving device 8 a facing the first region is provided. The third embodiment differs from the third embodiment in that a light receiving element 8b facing the second region is provided. The rest is the same as that of the third embodiment.

  The inclination angle of the reflection surface 6 formed in the first and second regions differs depending on the position where the index signal is detected. The inclination angles of the reflecting surfaces 6 are set so that all the reflected laser beams 7 deflected by the reflecting surfaces 6 formed in the first region are condensed on the light receiving element 8a. Similarly, the inclination angles of the reflection surfaces 6 are set so that all the reflected laser beams 7 deflected by the respective reflection surfaces 6 formed in the second region are condensed on the light receiving element 8b. When the scanning display device is viewed from the side, the light receiving elements 8 a and 8 b may be arranged at the same height as the scanning element 3 or may be arranged at a different height from the scanning element 3.

  FIG. 11 is a timing chart of the drive signal of the scanning element 3 and the index signal output from the light receiving elements 8a and 8b. In this example, the reflecting surface 6 is provided in the first and second regions along the horizontal scanning direction.

  In forward scanning in which the excitation laser beam 2 is scanned on the phosphor screen 4 from the right end of the display screen to the left end of the display screen, first, the first region is scanned with the excitation laser beam 2, and the light receiving element 8a is moved into the first region. The reflected laser beam 7 from the reflecting surface 6 is detected and an index signal is output. Subsequently, the second region is scanned with the excitation laser beam 2, and the light receiving element 8b detects the reflected laser beam 7 from the reflecting surface 6 in the second region and outputs an index signal.

  In the backward scan in which the excitation laser beam 2 is scanned from the left end of the display screen to the right end of the display screen, first, the second region is scanned with the excitation laser beam 2, and the light receiving element 8b is separated from the reflecting surface 6 in the second region. The reflected laser beam 7 is detected and an index signal is output. Subsequently, the first region is scanned with the excitation laser beam 2, and the light receiving element 8a detects the reflected laser beam 7 from the reflecting surface 6 in the first region and outputs an index signal.

  The control unit 9 detects the scanning position of the excitation laser light 2 for the first region based on the index signal from the light receiving element 8a, and for the second region based on the index signal from the light receiving element 8b. The scanning position of the excitation laser beam 2 is detected. Then, the control unit 9 performs control (modulation control) of the light emission timing of the laser light source 1 and amplitude control of the drive signal of the scanning element 3 based on the scanning positions detected in the first and second regions. This modulation control and amplitude control are basically the same as the modulation control and amplitude control in the first embodiment.

  According to the present embodiment, in addition to the effects of the third embodiment, the scanning position can be accurately detected by the entire phosphor screen 4.

  It should be noted that the size and number of regions for forming the reflective surface 6 are not particularly limited. The phosphor screen 4 may be divided into three or more regions, a reflective surface 6 may be formed for each region, and a light receiving element may be provided for each region. Thereby, since the required value of the inclination angle with respect to the reflecting surface 6 is further relaxed, it can be applied to a larger phosphor screen 4.

  In the first to fourth embodiments described above, the reflecting surface 6 is not limited to a flat surface, and may be a curved surface (concave surface, convex surface, or the like). The desired shape of the reflecting surface 6 can be determined based on the condensing state of the excitation laser light 2 at the reflecting surface position.

(Other embodiments)
When the excitation laser light 2 is collimated light, the state of the excitation laser light 2 is the same at any position on the phosphor screen 4.

  However, in order to display a high-definition image with a high resolution, it is necessary to make the phosphor stripe width as small as possible and to make the beam diameter of the excitation laser light 2 on the phosphor screen 4 small. .

  In the spot diagram of the excitation laser beam 2 on the phosphor screen 4, when the beam diameter in the horizontal direction (direction perpendicular to the phosphor stripe) is larger than the width of the phosphor stripe, the adjacent phosphor stripes are simultaneously irradiated. As a result, there arises a problem of color mixing in which unnecessary fluorescence is mixed.

  Even when the beam diameter in the horizontal direction is equal to the width of the phosphor stripe, the duty ratio of pulse modulation of the laser light source 1 must be reduced in order to avoid color mixing. When the duty ratio of pulse modulation is reduced, the luminance is lowered.

  Accordingly, it is desirable that the horizontal beam diameter of the excitation laser beam 2 is sufficiently small with respect to the width of the phosphor stripe.

  However, in general, laser light has a property that its beam diameter expands by diffraction as the propagation distance increases, and its divergence angle increases as the beam diameter decreases. Therefore, in principle, it is difficult to project from the scanning element 3 to the phosphor screen 4 while maintaining a very small beam diameter.

  In order to make the beam diameter of the excitation laser beam 2 sufficiently smaller than the width of the phosphor stripe, the excitation laser beam 2 emitted from the laser light source 1 is condensed using a condensing optical element such as a lens or a mirror. There is a need to. In this case, a beam waist is formed in the vicinity of the phosphor screen.

  FIG. 12 schematically shows the relationship between the position of the beam waist of the excitation laser beam 2 from the scanning element 3 and the position of the phosphor screen when the scanning display device provided with the condensing optical system is viewed from above. Shown in In FIG. 12, the horizontal direction is the horizontal scanning direction, and the direction perpendicular to the paper surface is the vertical scanning direction.

  As shown in FIG. 12, in the horizontal scanning range, the beam waist of the excitation laser light 2 is formed on an arcuate line, and the phosphor screen 4 is disposed in the vicinity of the beam waist.

  Specifically, the phosphor screen 4 has a central area located on the front side (scanning element 3 side) with respect to the beam waist position, and left and right areas located on both sides of the central area are located behind the beam waist position. It arrange | positions so that it may be located in the side (a side far from the scanning element 3). Thereby, the average value of the beam diameter on the phosphor screen 4 can be minimized.

  In the above case, the excitation laser beam 2 in the focused state is irradiated in the central region of the phosphor screen 4, and the excitation laser beam 2 in the diverging state is irradiated in the left and right regions of the phosphor screen 4. A beam waist is formed at the boundary between the central region and the left and right regions.

  In the configuration in which the beam waist of the excitation laser beam 2 is formed in the vicinity of the phosphor screen 4 as shown in FIG. 12, the reflecting surface 6 made of a plane is provided in each of the central region and the left and right regions of the phosphor screen 4. When formed, the following problems occur.

  In the central region of the phosphor screen 4, the condensed excitation laser light 2 is irradiated on the reflection surface 6. The reflected laser light 7 from the reflecting surface 6 forms a beam waist in the middle of the optical path toward the light receiving element 8, and then diverges and reaches the light receiving element 8. In this case, the beam diameter of the reflected laser beam 7 in the divergent state becomes larger than the light receiving surface of the light receiving element 8, and a state occurs in which only a part of the reflected laser light 7 is incident on the light receiving surface. In such a state, in addition to a decrease in the intensity of the index signal, a part of the reflected laser light 7 becomes stray light, which causes an erroneous detection of the index signal.

  In the left and right regions of the phosphor screen 4, the diverging excitation laser light 2 is irradiated onto the reflecting surface 6, and the reflected laser light 7 from the reflecting surface 6 is also diverged. In this case as well, problems such as a decrease in the intensity of the index signal and an erroneous detection of the index signal due to stray light occur.

  Therefore, in this other embodiment, a scanning display device including a phosphor screen 4 that can solve the above-described problem while taking advantage of the features of the first to fourth embodiments described above will be described.

  The scanning display device of the other embodiment is the same as that shown in FIG. 1 except that the configurations of the laser light source 1 and the phosphor screen 4 are different.

  The laser light source 1 includes a condensing optical system and is configured such that the beam waist of the excitation laser light 2 is formed in the vicinity of the phosphor screen 4 as shown in FIG.

  FIG. 13 shows the configuration of the phosphor screen 4. As shown in FIG. 13, the phosphor screen 4 includes a central region 4a and end side regions 4b and 4c.

  The central region 4a is a region located in front of the beam waist position shown in FIG. 12, and the focused excitation laser light 2 is irradiated.

  The end side region 4b is adjacent to the left side of the central region 4a. The end side region 4c is adjacent to the right side of the central region 4a. The end side regions 4b and 4c are regions located behind the beam waist position shown in FIG. 12, and are irradiated with the divergent excitation laser light 2.

  A convex reflecting surface 6a is provided on the black stripe 5 in the detection target pixel in the central region 4a. A concave reflecting surface 6b is provided on the black stripe 5 in the detection target pixel in the end regions 4b and 4c.

  FIG. 14 schematically shows a cross-sectional structure of the reflecting surface 6a. The cross section shown in FIG. 14 is a cross section when the reflecting surface 6a is cut in the horizontal direction (direction orthogonal to the phosphor stripe).

  As shown in FIG. 14, the reflecting surface 6a has a convex shape, and the convex surface is configured such that the reflected excitation laser light 2 is reflected and the reflected laser light 7 that is the reflected light becomes collimated light. Has been. The reflected laser beam 7 from the reflecting surface 6 a is incident on the light receiving surface of the light receiving element 8.

  The focal length of the condensing optical system included in the laser light source 1 is set to f1, the focal length of the reflecting surface 6a is set to f2, and the curvature radius of the convex surface of the reflecting surface 6a is set so as to constitute an afocal system. In general, a convex mirror has the same effect as a concave lens having a focal length that is ½ times the radius of curvature. For this reason, when the reflecting surface 6a is a so-called Galileo type afocal system, the condensed excitation laser light 2 can be converted into collimated light.

  The convex reflecting surface 6a can be formed, for example, by digging down a part of the black stripe 5 with an inclination from the surface and processing the surface of the digging part into a convex shape.

  FIG. 15 schematically shows a cross-sectional structure of the reflecting surface 6b. The cross section shown in FIG. 15 is a cross section when the reflecting surface 6b is cut in the horizontal direction (direction orthogonal to the phosphor stripe).

  As shown in FIG. 15, the reflecting surface 6b has a concave shape, and the concave surface is configured so as to reflect the divergent excitation laser light 2 and the reflected laser light 7 as the reflected light becomes collimated light. ing. The reflected laser beam 7 from the reflecting surface 6 b is incident on the light receiving surface of the light receiving element 8.

  The focal length of the condensing optical system included in the laser light source 1 is set to f1, the focal length of the reflecting surface 6b is set to f2, and the radius of curvature of the concave surface is set so as to constitute an afocal system. In general, the concave mirror has the same effect as a convex lens having a focal length that is 1/2 the radius of curvature. For this reason, by making the reflection surface 6b a so-called Kepler type afocal system, the divergent excitation laser light 2 can be converted into collimated light.

  The concave-shaped reflecting surface 6b can be formed, for example, by digging down a part of the black stripe 5 with an inclination from the surface and processing the surface of the dug-down portion into a concave shape.

  According to this other embodiment, the excitation laser beam 2 is converted into the collimated reflected laser beam 7 on each of the reflecting surface 6a in the central region 4a and the reflecting surfaces 6b in the end-side regions 4b and 4c, All the reflected laser light 7 is incident on the light receiving surface of the light receiving element 8. As a result, it is possible to avoid problems such as a decrease in the intensity of the index signal and erroneous detection of the index signal due to stray light.

  Based on the index signal from the light receiving element 8, the control unit 9 detects the scanning position in the central region 4a and the end regions 4b and 4c.

  In the other embodiments, any of the features described in the second to fourth embodiments can be employed. In addition, when dividing | segmenting or restrict | limiting the area | region which forms a reflective surface, in each area | region, considering whether the excitation laser beam 2 is a divergence state or a condensing state, the reflection surfaces 6a and 6b The curved surface shape is appropriately set to a concave surface or a convex surface.

  Further, the scanning display device according to the other embodiment includes a first light receiving element provided facing the central region 4a, a second light receiving element provided facing the end side region 4b, and an end side region. You may have the 3rd light receiving element provided facing 4c. In this case, the reflected laser light 7 from the convex reflecting surface 6a in the central region 4a is incident on the light receiving surface of the first light receiving element, and is reflected from the concave reflecting surface 6b in the end side region 4b. 7 is incident on the light receiving surface of the second light receiving element, and the reflected laser light 7 from the concave reflecting surface 6b in the end region 4c is incident on the light receiving surface of the third light receiving element.

  In the above case, the control unit 9 detects the scanning position in the central region 4a based on the index signal from the first light receiving element, and scans in the end side region 4b based on the index signal from the second light receiving element. And the scanning position in the end side region 4c is detected based on the index signal from the third light receiving element.

  In the scanning display device according to the other embodiment, the convex reflecting surface 6a may be provided in the central region 4a, and the concave reflecting surfaces 6b may not be provided in the end regions 4b and 4c.

  Further, in the scanning display device according to the other embodiment, the concave reflecting surface 6b is provided in at least one of the end regions 4b and 4c, and the convex reflecting surface 6a is not provided in the central region 4a. It may be.

  In each of the above-described embodiments, instead of the phosphor stripe 4B of the phosphor screen 4, a blue diffusion stripe containing a material that diffuses the excitation laser light 2 may be used. In this case, a blue laser light source having a center wavelength in the blue wavelength region is used as the laser light source 1.

  Instead of the black stripe 5, a black matrix including a vertical black stripe extending in the vertical scanning direction and a horizontal black stripe extending in the horizontal scanning direction may be used.

  In each embodiment described above, the phosphor screen 4 can be produced by various methods. For example, only the black stripe portion including the reflective surface is created with a mold. Next, the black stripe created by the mold is bonded to the substrate, and the phosphor is applied to the exposed portions between the black stripes of the substrate. Finally, a mask process is performed on the reflective surface, and the reflective surface is formed by metal deposition or the like. In addition, a method of forming the phosphor screen 4 using sandblasting, resin lamination, or the like is also conceivable.

DESCRIPTION OF SYMBOLS 1 Excitation laser light source 2 Excitation laser beam 3 Scanning element 4 Phosphor screen 4R, 4G, 4B Visible light phosphor 5 Black stripe 6 Reflecting surface 7 Reflecting laser beam 8 Light receiving element 9 Control part

Claims (14)

A plurality of phosphor regions that absorb excitation light and emit visible light, provided at regular intervals in the in-plane direction;
A black region that divides the in-plane region into the plurality of phosphor regions;
A plurality of reflective portions provided on the black region,
Each of the plurality of reflecting portions includes an inclined surface, and each inclined surface is formed with a reflecting surface, and each of the reflecting surfaces reflects the excitation light incident from a predetermined direction. The angle of inclination and the direction of inclination of each of the reflecting surfaces so that the reflected light reflected by the reflecting surface is incident on a predetermined region of the surface facing the surface on which the plurality of phosphor regions and the black region are formed. Is set, fluorescent screen. The black region includes a plurality of black stripes,
Each of the reflective surfaces is formed on a part of the specific black stripe of the plurality of black stripes over the entire width of the specific black stripe, and the height from the surface on which the specific black stripe is formed. 2. The phosphor screen according to claim 1, wherein the phosphor screen includes regions higher and lower than a surface of the specific black stripe. The black region is composed of a plurality of black stripes,
Each of the reflective surfaces is formed on a part of a specific black stripe of the plurality of black stripes, and the height of the reflective surface from the surface on which the specific black stripe is formed is the specific black stripe. The phosphor screen according to claim 1, wherein the phosphor screen is lower than a surface of the black stripe.   The phosphor screen according to claim 1, wherein each of the reflecting surfaces is a flat surface.   The phosphor screen according to claim 1, wherein each of the reflection surfaces is a curved surface. The plurality of reflecting portions include a first reflecting portion having a convex reflecting surface and a second reflecting portion having a concave reflecting surface,
The in-plane region includes a first region in which the first reflecting portion is formed and a second region adjacent to the first region in which the second reflecting portion is formed. The phosphor screen according to claim 5. A phosphor screen;
An excitation light source that outputs excitation light;
A scanning element that scans the excitation light on the phosphor screen;
A light receiving means that is provided at a position facing the scanning surface of the phosphor screen, detects reflected light of the excitation light from the reflecting surface, and outputs an index signal indicating the detection timing;
A control unit that adjusts the light emission timing of the excitation light source or the amplitude of a drive signal for driving the scanning element based on the index signal from the light receiving means;
The phosphor screen is
A plurality of phosphor regions that absorb excitation light and emit visible light, provided at regular intervals in the in-plane direction;
A black region that divides the in-plane region into the plurality of phosphor regions;
A plurality of reflective portions provided on the black region,
Each of the plurality of reflecting portions includes an inclined surface, and each inclined surface is formed with a reflecting surface, and each of the reflecting surfaces reflects the excitation light incident from a predetermined direction. The angle of inclination and the direction of inclination of each of the reflecting surfaces so that the reflected light reflected by the reflecting surface is incident on a predetermined region of the surface facing the surface on which the plurality of phosphor regions and the black region are formed. Is a scanning display device. The black region includes a plurality of black stripes,
Each of the reflective surfaces is formed on a part of a specific black stripe of the plurality of black stripes over the entire width of the specific black stripe, and from the surface on which the specific black stripe is formed. The scanning display device according to claim 7, wherein the scanning display device includes a region whose height is higher and lower than a surface of the specific black stripe. The black region includes a plurality of black stripes;
Each of the reflective surfaces is formed on a part of a specific black stripe of the plurality of black stripes, and the height of the reflective surface from the surface on which the specific black stripe is formed is the specific black stripe. The scanning display device according to claim 7, wherein the scanning display device is lower than a surface of the black stripe.   10. The scanning display device according to claim 7, wherein a distance between the phosphor screen and the light receiving unit is longer than a distance between the phosphor screen and the scanning element. The phosphor screen has a plurality of partial regions each formed with the plurality of reflection portions,
The light receiving means is provided corresponding to each of the plurality of partial regions, each of which detects reflected light of the excitation light from the reflection surfaces of the plurality of reflection portions, and outputs an index signal indicating the detection timing Having a plurality of light receiving elements,
The said control part adjusts the light emission timing of the said excitation light source, or the amplitude of the drive signal which drives the said scanning element based on the said index signal from these light receiving elements. Scanning display device.   The scanning display device according to claim 7, wherein the reflection surfaces of the plurality of reflection units are flat surfaces. A condensing optical system for condensing the excitation light;
The scanning element scans the excitation light condensed by the condensing optical system on the phosphor screen,
The scanning display device according to claim 7, wherein each of the reflection surfaces of the plurality of reflection units is a curved surface. The phosphor screen has a first region irradiated with the excitation light in a condensed state and a second region irradiated with the excitation light in a diverged state,
The plurality of reflecting portions include a first reflecting portion having a convex reflecting surface formed in the first region, and a concave reflecting surface formed in the second region. The scanning display device according to claim 13, further comprising a second reflection unit.

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