JP2013200434A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display unit that can display a full-color image with only one solid light source when displaying a full-color image by scanning a phosphor region with excitation light emitted from the solid light source.SOLUTION: The display unit comprises: a solid light source 2 emitting light of a predetermined wavelength within a wavelength region from ultraviolet light to visible light as excitation light; light source control means 3 for controlling light emission of the solid light source 2 on the basis of predetermined data; a phosphor frame (phosphor screen) 7 formed by alternately laminating, with partition walls, at least one kind of phosphor region that is excited by excitation light when the excitation light from the solid light source 2 is made incident and emits fluorescent light of a wavelength longer than the excitation light; scanning means 8 for scanning the phosphor frame 7 with the excitation light from the solid light source 2; and scan control means 9 for controlling the scanning of the scanning means 8.

Description

  The present invention relates to a display device.

  FIG. 1 is a perspective view showing a rear projection type display device of Patent Document 1, and FIG. 2 is a sectional view showing a screen portion of the display device of FIG. Referring to FIGS. 1 and 2, the display device includes a phosphor layer 118 in which a green phosphor that emits green light when irradiated with near-ultraviolet excitation laser light UV is dispersed in a translucent substrate. Screen sheet 111, excitation laser light source 103 that emits excitation laser light UV, red laser light source 102 that emits red laser light R, blue laser light source 104 that emits blue laser light B, and each laser A scanning unit 106 that modulates the laser beams R, UV, and B emitted from the light sources 102, 103, and 104 based on the color video signal and scans the phosphor layer 118 of the screen sheet 111 is provided.

  1 and 2, reference numeral 105 denotes a screen portion, reference numeral 112 denotes a black matrix, reference numeral 113 denotes a protective film, reference numeral 114 denotes an excitation light transmission preventing plate, and reference numeral 117 denotes a size of each pixel for displaying a color image. The phosphor plate 118 of the screen sheet 111 is formed in the through hole 116 of the metal plate 117.

  In FIG. 1, the scanning unit 106 includes a horizontal scanning mirror 127 and a vertical scanning mirror 128.

  In the display device having such a configuration, a near ultraviolet excitation laser beam UV, a red laser beam R, a blue laser beam are applied to a screen sheet 111 having a phosphor layer 118 in which a green phosphor is dispersed in a translucent substrate. Since the light B is scanned, the green phosphor emits green light when irradiated with the near ultraviolet excitation laser light UV, the phosphor layer 118 glows green G, and the red laser light R and the blue laser light B are green fluorescence. Since the phosphor layer 118 shines in red R and blue B through the translucent substrate while being scattered by the body, a full-color image having the red light R, green light G, and blue light B as the three primary colors is screen sheet. 111 can be displayed.

JP 2011-164537 A

  However, in the above-described rear projection type display device of Patent Document 1, it is necessary to use three types of laser light sources 102, 103, and 104 in order to display a full color image. That is, the display of a full-color image is not performed with only one laser light source, and the entire apparatus is increased in size and cost.

  In the rear projection type display device of Patent Document 1 described above, the phosphor layer 118 has a green phosphor dispersed in a translucent base material, and visible light is emitted from the phosphor layer. Even though it passes through 118, it is transmitted while being scattered by the green phosphor. Therefore, when it is not irradiated with laser light, it is not transparent (clear and transparent) to visible light. The rear projection type display device of Document 1 has not been configured as a see-through type display device (a display device that is transparent (clear and transparent) with respect to visible light when not irradiated with laser light).

  In the present invention, when a full color image is displayed by scanning a phosphor region with excitation light from a solid light source, it is possible to display a full color image with only one solid light source. It is an object of the present invention to provide a display device having a see-through type structure that is transparent (clear and transparent) to visible light when excitation light is not irradiated.

  In order to achieve the above object, the invention described in claim 1 is a solid light source that emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light as excitation light, and the light emission of the solid light source is predetermined. And a light source control means for controlling based on the data, and at least one type of phosphor region that emits fluorescence having a longer wavelength than the excitation light when excited by the excitation light from the solid light source is incident on the partition wall And a scanning unit that scans the phosphor frame with excitation light from the solid-state light source, and a scanning control unit that controls scanning by the scanning unit, and the light source The light emission of the solid-state light source by the control means is controlled in synchronization with the scanning control by the scanning means.

  According to a second aspect of the present invention, in the display device according to the first aspect, a phosphor material that is transparent to visible light is used for the phosphor region when the excitation light from the solid light source is not irradiated. It is characterized by being.

  According to a third aspect of the present invention, in the display device according to the second aspect, a metal complex or a nanophosphor is used in the phosphor region.

  According to a fourth aspect of the present invention, in the display device according to the first aspect, the scanning means mainly uses a direction x in which at least one type of phosphor region of the phosphor frame is alternately stacked by partition walls. Scanning is performed, and the length direction z of at least one phosphor region of the phosphor frame is scanned as a sub-scanning direction.

  According to the first to fourth aspects of the present invention, a solid-state light source that emits light having a predetermined wavelength in the wavelength region from ultraviolet light to visible light as excitation light, and emission of the solid-state light source with predetermined data And at least one phosphor region that is excited by the excitation light and emits fluorescence having a longer wavelength than the excitation light when the excitation light from the solid light source is incident. A phosphor frame laminated on the substrate, scanning means for scanning the phosphor frame with excitation light from the solid-state light source, and scanning control means for controlling scanning by the scanning means, and the light source control means The light emission of the solid-state light source is controlled in synchronism with the scanning control by the scanning means, so that a full-color image can be displayed with only one solid-state light source. Reduction, it is possible to reduce the cost.

  In particular, according to the invention described in claims 2 and 3, in the display device according to claim 1, the phosphor region is transparent to visible light when the excitation light from the solid light source is not irradiated. Since a fluorescent material is used, a display device having a see-through type structure that is transparent (clear and transparent) to visible light when excitation light from a solid light source is not irradiated is provided. be able to.

It is a figure which shows the display apparatus of patent document 1. FIG. It is sectional drawing which shows the screen part of the display apparatus of FIG. It is a perspective view which shows one structural example of the display apparatus of this invention. It is a schematic plan view which shows the fluorescent substance frame (phosphor screen) of the display apparatus of FIG. It is the elements on larger scale of the fluorescent substance flame | frame (phosphor screen) of FIG. It is a figure which shows the example of a manufacturing process of the fluorescent substance frame (phosphor screen) of this invention. It is a figure which shows how to scan the fluorescent substance frame (phosphor screen) of this invention with the excitation light from a solid light source by a scanning means. It is a figure which shows the other method of scanning the fluorescent substance flame | frame (phosphor screen) of this invention with the excitation light from a solid light source by a scanning means. It is a figure which shows the modification of the fluorescent substance flame | frame (phosphor screen) of this invention. It is a figure which shows the display apparatus for game machines of a 1st example. It is a figure which shows the display apparatus for motor vehicles of a 2nd example. When the phosphor frame (phosphor screen) is used in the arrangement of FIG. 7 or FIG. 9, the phosphor according to the relative positional relationship between the x direction of the phosphor frame (phosphor screen) and the line of sight of the observer It is a figure which shows the structure of the partition wall of a flame | frame (phosphor screen). When the phosphor frame (phosphor screen) is used in the arrangement of FIG. 8 or FIG. 9, the phosphor according to the relative positional relationship between the z direction of the phosphor frame (phosphor screen) and the line of sight of the observer It is a figure which shows the structure of the partition wall of a flame | frame (phosphor screen).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 is a perspective view showing one structural example of the display device of the present invention. 4 is a schematic plan view showing the phosphor frame (phosphor screen) of the display device of FIG. 3, FIG. 5A is a partially enlarged plan view of the phosphor frame (phosphor screen) of FIG. (B) is sectional drawing in the AA line of Fig.5 (a). Referring to FIGS. 3, 4, 5 (a) and 5 (b), this display device emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light as excitation light. And light source control means 3 for controlling light emission of the solid light source 2 based on predetermined data, and when excitation light from the solid light source 2 is incident, it is excited by the excitation light and emits fluorescence having a wavelength longer than that of the excitation light. A phosphor frame (phosphor screen) 7 in which at least one type of phosphor region 5 to be emitted is alternately laminated by partition walls 6, and scanning means 8 that scans the phosphor frame 7 with excitation light from the solid light source 2; And a scanning control means 9 for controlling scanning by the scanning means 8, and the light emission of the solid light source 2 by the light source control means 3 is controlled in synchronization with the scanning control by the scanning means 8. Yes.

  Here, as the solid-state light source 2, a semiconductor laser having an emission wavelength in a range from ultraviolet light to visible light can be used.

  More specifically, for example, a semiconductor laser that emits near-ultraviolet light having an emission wavelength of about 375 nm to about 405 nm can be used as the solid-state light source 2. Besides the semiconductor laser, for example, a continuous wave laser having an emission wavelength of about 355 nm to about 375 nm or a pulse laser having an emission wavelength of about 260 nm to about 355 nm can be used as the solid light source 2.

  The solid-state light source 2 may be a semiconductor laser that emits blue light having an emission wavelength of about 440 nm to about 490 nm, for example.

  In addition, as at least one kind of phosphor region 5 of the phosphor frame (phosphor screen) 7, in the example of FIGS. 3, 4, 5 (a) and (b), a red phosphor region R and a green phosphor A body region G and a blue phosphor region B are provided.

  Specifically, when the solid-state light source 2 is, for example, a semiconductor laser that emits near-ultraviolet light having an emission wavelength of about 375 nm to about 405 nm, the red phosphor region R, the green phosphor region G, and the blue fluorescence For the body region B, a transparent substrate such as resin or glass and a mixture of a red phosphor, a green phosphor, and a blue phosphor (dispersed and mixed so as not to aggregate) can be used. On the other hand, for example, when a semiconductor laser that emits blue light having an emission wavelength of about 440 nm to about 490 nm is used as the solid light source 2, the red phosphor region R and the green phosphor region G include resin, glass, or the like. Each of the transparent substrates is a mixture of red and green phosphors (mixed and dispersed so as not to agglomerate), and the blue phosphor region B has a transparent substrate such as resin or glass. Instead of the blue phosphor, a mixture of predetermined light scatterers (a mixture that is dispersed and mixed so as not to aggregate, and that scatters weakly) can be used.

  Here, when a resin is used for the transparent substrate, it is preferable to use a resin having a heat resistance and a light resistance as high as possible. For example, ABS (acrylonitrile / butadiene / styrene), silicone, polycarbonate, polystyrene, acrylic, Plastics such as an epoxy resin can be used. These resins are preferably transparent resins, but may be weakly scattering (haze) resins.

Further, in the present invention, in order to provide a display device having a see-through type structure that is transparent (clear and transparent) to visible light when excitation light from the solid light source 2 is not irradiated, In the region 5, a phosphor material that is transparent to visible light is used when the excitation light from the solid light source 2 is not irradiated. As such a phosphor material, when the excitation light from the solid light source 2 is ultraviolet light, a metal complex (transition metal complex or rare earth complex) can be used. Here, as a phosphor material of a metal complex (transition metal complex or rare earth complex), for example, a europium compound that emits red light, a perylene compound that emits blue light, or a terbium compound that emits green light under ultraviolet irradiation can be used. . On the other hand, when the excitation light from the solid light source 2 is blue light, a nanophosphor can be used as the phosphor material. That is, nanophosphor particles that emit red light under blue light irradiation and nanophosphor particles that emit green light can be used. Here, as the nanophosphor emitting red light under blue light irradiation, CaS: Eu ²⁺ , Mn ²⁺ , SrS: Eu ²⁺ , (Zn, Cd) S: Ag, Mg ₄ GeO _5.5 F: MN ⁴⁺ , ZnSe: Ce, ZnSeS: Cu, Cl, and the like can be used, and nanophosphors that emit green light under blue light irradiation include ZnS: Cu ⁺ , SrGa ₂ S ₄ : Eu ²⁺ , YAG: Ce ³⁺ , and BaSrGa _4. S ₇ : Eu or the like can be used.

  In this case, it is desirable to disperse the metal complex (transition metal complex or rare earth complex) or nanophosphor so as not to aggregate in the transparent substrate (for example, the surface of the nanophosphor particle is modified with a polymer). Is desirable).

  The partition wall 6 of the phosphor frame (phosphor screen) 7 is provided so as not to mix the light from the phosphor region 5 adjacent thereto into the phosphor region 5, and the phosphor frame (phosphor screen). For the partition wall 6 of 7), a reflection plate such as a metal thin film or a light shielding film (absorption plate) such as a black pigment can be used. In addition, it is preferable to use a reflecting plate rather than an absorbing plate from the viewpoint of improving light utilization efficiency. Thus, by using a reflecting plate such as a metal thin film or a light shielding film (absorbing plate) such as a black pigment for the partition wall 6 of the phosphor frame (phosphor screen) 7, the phosphor frame (phosphor screen) is used. 7) is configured as a so-called louver-shaped one.

  Each phosphor region 5 of the phosphor frame (phosphor screen) 7 has a width Dx and a thickness Dy in the x direction and the y direction of about 0.1 to 2.0 mm (for example, 0.4 mm), and z The direction length Dz is, for example, about 25.6 cm. Further, the partition wall 6 of the phosphor frame (phosphor screen) 7 has a width Tx in the x direction of, for example, about 200 nm, and the thickness in the y direction and the length in the z direction are the phosphor frame (phosphor screen). 7 is the same as each phosphor region 5. Further, the width Ex in the x direction and the length Ez (= Dz) in the z direction of the entire phosphor frame (phosphor screen) 7 are each about 25.6 cm, for example.

  6A, 6B, 6C, and 6D are diagrams showing an example of a manufacturing process of the phosphor frame (phosphor screen) 7 shown in FIGS. 4, 5A, and 5B. .

  Referring to FIGS. 6A, 6B, 6C, and 6D, three types of phosphor regions 5 include a red phosphor plate R, a green phosphor plate G, and a blue phosphor plate B. Is prepared (FIG. 6A). Next, a reflecting plate 6 such as a metal thin film is formed on the red phosphor plate R, the green phosphor plate G, and the blue phosphor plate B (FIG. 6B). Next, the plates R, G, and B on which the reflecting plate 6 such as a metal thin film is formed are laminated while being alternately bonded (FIG. 6C), and this is cut along the line CC. (FIG. 6D), the phosphor frame (phosphor screen) 7 shown in FIGS. 5A and 5B can be produced.

  Although not shown, an ultraviolet absorbing film may be formed on the surface of the phosphor frame (phosphor screen) 7 on the viewer side.

  The phosphor frame (phosphor screen) 7 as described above is disposed on the windshield of a vehicle (for example, an automobile) or the surface of a front panel of a game machine (for example, a pachinko). That is, the display device of the present invention can be configured specifically as a vehicle display device or a display device for game machines.

  In the example of FIG. 3, the scanning unit 8 includes a horizontal scanning mirror 11 that scans the phosphor frame 7 in the horizontal direction (main scanning direction) with excitation light from the solid light source 2, and excitation light from the solid light source 2. And a vertical scanning mirror 12 for scanning the phosphor frame 7 in the vertical direction (sub-scanning direction). Here, for example, a polygon mirror or the like can be used for each of the horizontal scanning mirror 11 and the vertical scanning mirror 12. Further, as the horizontal scanning mirror 11 and the vertical scanning mirror 12, that is, as the scanning means 8, a micro scanning mirror capable of driving a minute mirror at high speed by, for example, a micro-electro-mechanical system (MEMS) technique. (MEMS mirror) may be used, which is desirable for miniaturization.

  FIG. 7 is a diagram showing how the phosphor frame (phosphor screen) 7 is scanned with the excitation light from the solid-state light source 2 by the scanning means 8. In the example of FIG. 7, the x direction of the phosphor frame (phosphor screen) 7 is horizontal to the observer (main scanning direction), and the z direction of the phosphor frame (phosphor screen) 7. Is set in the vertical direction (sub-scanning direction). In this case, the horizontal scanning mirror 11 scans the phosphor frame (phosphor screen) 7 in the horizontal direction (main scanning direction) (solid arrow in FIG. 7), and the vertical scanning mirror 12 scans the phosphor frame (phosphor screen). ) 7 in the vertical direction (sub-scanning direction) (broken line arrow in FIG. 7), the entire phosphor frame (phosphor screen) 7 can be scanned. Here, when the horizontal scanning mirror 11 scans the phosphor frame (phosphor screen) 7 in the horizontal direction (main scanning direction), each phosphor region 5 of the phosphor frame (phosphor screen) 7 in the x direction. The width Dx corresponds to the width in the x direction of one pixel (the width in the z direction of one pixel is determined by the sub scanning interval in the vertical direction (sub scanning direction)), and the scanning period of the width Dx in the x direction of each phosphor region 5 By synchronizing the light emission of the solid state light source 2 with the light source control means 3 based on predetermined data (specifically, color image data to be displayed) in synchronization with (horizontal scanning period), The phosphor frame (phosphor screen) 7 can be displayed.

  In the example of FIG. 7, the x direction of the phosphor frame (phosphor screen) 7 is in the horizontal direction (main scanning direction) with respect to the observer, and the phosphor frame (phosphor screen) 7 Although the z direction is set to be the vertical direction (sub-scanning direction), as shown in FIG. 8, the z direction of the phosphor frame (phosphor screen) 7 is horizontal to the observer (main scanning direction). It is also possible to set the x direction of the phosphor frame (phosphor screen) 7 to be the vertical direction (sub-scanning direction). In this case, when the phosphor frame (phosphor screen) 7 is scanned in the horizontal direction (main scanning direction) by the horizontal scanning mirror 11, the z direction of the phosphor region 5 of the phosphor frame (phosphor screen) 7 is used. However, since the phosphor region 5 does not have the partition wall 6 in the z direction (that is, there is no partition wall between the pixels), light from adjacent pixels is mixed. , The image becomes blurred easily. On the other hand, as shown in the example of FIG. 7, the x direction of the phosphor frame (phosphor screen) 7 is horizontal to the observer (main scanning direction), and the phosphor frame (phosphor If the z direction of the screen (7) is set to be the vertical direction (sub-scanning direction), since there is a partition wall 6 between the pixels, mixing of light from adjacent pixels can be prevented, and a clear image can be obtained. It becomes easy to be done. As shown in FIG. 9, it is also possible to provide partition walls (for example, metal reflective films) 6 in both the x and z directions of the phosphor frame (phosphor screen) 7, and in this case, in particular, There are no restrictions and a clear image is always obtained.

  In the display device having such a configuration, the solid-state light source 2 that emits light having a predetermined wavelength in the wavelength region from ultraviolet light to visible light as excitation light, and the light emission of the solid-state light source 2 based on predetermined data. When the excitation light from the solid-state light source 2 is incident, the light source control means 3 to be controlled and at least one type of phosphor region 5 that is excited by the excitation light and emits fluorescence having a longer wavelength than the excitation light are alternately separated by the partition walls 6. A phosphor frame (phosphor screen) 7 stacked on the substrate, a scanning unit 8 that scans the phosphor frame 7 with excitation light from the solid light source 2, and a scanning control unit 9 that controls scanning by the scanning unit 8. The light emission of the solid light source 2 by the light source control means 3 is controlled in synchronism with the scanning control by the scanning means 8, thereby displaying a full color image with only one (single color) solid light source 2. Can be carried out, it is possible to reduce the size of the apparatus, the cost reduction.

  Further, since the phosphor region 5 is made of a fluorescent material transparent to visible light when the excitation light from the solid light source 2 is not irradiated, the excitation light from the solid light source 2 is not irradiated. In some cases, it is possible to provide a display device having a see-through configuration that is transparent (clear and transparent) to visible light. Specifically, when the phosphor frame (phosphor screen) 7 is attached to a windshield of a vehicle (for example, an automobile) or a front panel surface of a game machine (for example, a pachinko), the excitation light from the solid light source 2 is used. At the time of non-irradiation, an observer (a driver or the like) does not mind the presence of the phosphor frame (phosphor screen) 7 because the phosphor frame (phosphor screen) 7 is transparent. You can see the back of the phosphor screen (7), and you can drive and play without any trouble, and it is displayed on the phosphor frame (phosphor screen) 7 when the solid-state light source 2 is irradiated with excitation light. You can see the image.

  Next, the present invention will be described more specifically.

  The first example of the present invention uses a semiconductor laser (ultraviolet laser) that emits near-ultraviolet light having an emission wavelength of about 375 nm to about 405 nm (for example, 405 nm) as the solid-state light source 2, and a phosphor frame (phosphor) Screen) red phosphor region R, green phosphor region G, and blue phosphor region B of phosphor region 5 on a transparent substrate such as resin and glass, respectively, red phosphor, green phosphor, and blue phosphor. It is a display device for a game machine using a mixture of the above (dispersed and mixed so as not to aggregate).

  The overall configuration of the display device for a gaming machine of the first example is such that a display having the following basic configuration is displayed on the front panel (transparent panel) of the gaming machine.

  Here, the basic configuration is to scan light from an ultraviolet laser as the solid light source 2 and irradiate it while scanning the phosphor frame (phosphor screen) 7. In the red phosphor region R, the green phosphor region G, and the blue phosphor region B of the phosphor region 5 of the phosphor frame (phosphor screen) 7, each type of metal complex is formed on a transparent substrate such as resin or glass. Are dispersed and mixed, and these are excited by ultraviolet rays to emit visible lights R, G, and B having different wavelengths. In addition, since an ultraviolet absorbing film is formed on the viewer side, ultraviolet rays do not escape.

  In such display devices for game machines, the phosphor frame (phosphor screen) 7 is normally transparent, so that the viewer can see the panel as it is when not displaying.

  FIG. 10 is a diagram showing a display device for a game machine of the first example. In FIG. 10, the same reference numerals are assigned to the same portions (or corresponding portions) as in FIG. 4. Further, in FIG. 10, the light source control means 3 and the scanning control means 9 are not shown.

  In the display device for game machines, for example, a projected image is drawn on the surface of a front panel such as a pachinko machine, and at least a solid light source (in this case, an ultraviolet laser) 2, a scanning means (scanning mechanism) 8, A phosphor frame (phosphor screen) 7 is provided, and these components are fixed and held.

  Specifically, the scanning unit 8 is disposed on the optical axis of the solid light source 2. As the scanning means 8, for example, a combination of two polygon mirrors (that is, polygon mirrors for vertical scanning (sub-scanning) and horizontal scanning (main scanning)) 12 and 11 can be used. The polygon mirror 12 for vertical scanning performs laser beam vertical scanning (sub-scanning) while changing the angle with the horizontal axis as a rotation axis. The horizontal scanning polygon mirror 11 scans the laser beam horizontally while changing the angle with the vertical axis as the rotation axis. Each of the mirrors 12 and 11 is not limited to a polygon mirror, but can be one that is operated by various known driving methods. For example, a micro scanning mirror capable of driving a micro mirror at high speed by a micro-electro-mechanical system (MEMS) technique may be used, which is desirable for miniaturization.

  Further, the phosphor frame (phosphor screen) 7 is a rear stage of the scanning means 8 and is disposed on the back side of the panel of the game machine. The phosphor frame (phosphor screen) 7 is obtained by mixing a phosphor with a transparent substrate such as resin or glass. Details will be described later.

  More specifically, the phosphor frame (phosphor screen) 7 is disposed in a portion where the ultraviolet laser beam is projected. In this case, it is necessary to match the position where the laser beam is irradiated with the position of the partially formed phosphor, but this can be adjusted by adjusting the scanning means 8 or the timing of turning on / off the laser beam from the solid light source 2. The positional accuracy is not so required. That is, high-precision adjustment is required at the time of adjustment, but it may be adjusted once.

  An example of the manufacturing process of the phosphor frame (phosphor screen) 7 in the first example is the same as that shown in FIGS. 6 (a), (b), (c), and (d).

  That is, first, as three types of phosphor regions 5, a red phosphor plate R, a green phosphor plate G, and a blue phosphor plate B are prepared (FIG. 6A). Here, each of the plates R, G, and B is obtained by dissolving and mixing, for example, a europium compound or ruthenium compound that emits red light, a terbium compound that emits green light, and a perylene compound that emits blue light in a resin material under ultraviolet irradiation. Processed into a shape. The concentration to be mixed needs to be optimized depending on the thickness of the resin and the output of the laser. Here, about 10% of the compound was mixed with the resin. Examples of the processing method include injection molding and extrusion molding, but are not particularly limited. The resin can be selected from, but not limited to, ABS (acrylonitrile / butadiene / styrene), silicone, polycarbonate, polystyrene, acrylic, epoxy resin, and the like. Although a transparent resin is desirable, a resin that scatters weakly (Haze) may be used. Since the thickness of the plate (plate thickness) is the resolution of the display, the thickness to be produced is determined according to the resolution. Preferably, it is about 0.1-2.0 mm, but here it is about 0.4 mm. In addition, phosphor plates each emitting RGB three colors were produced.

  Next, a reflecting plate such as a metal thin film or a light shielding film such as a black pigment is formed on one or both sides of the red phosphor plate R, the green phosphor plate G, and the blue phosphor plate B (FIG. 6B). Here, the metal reflective film 6 made of silver alloy is formed with a thickness of about 200 nm on one side of the plate by sputtering.

  Next, a plurality of plates R, G, and B with the metal reflective film 6 thus produced were laminated in the order of RGB (FIG. 6C). Adhering with an adhesive applied between them, or heating and pressurizing, a block body formed by integrating these plural sheets was formed. The number of layers to be stacked is determined according to the size of the screen 7 to be obtained.

  Subsequently, the louver-like phosphor frame (phosphor screen) 7 is obtained by slicing the block body along a cut surface perpendicular to the sheet surface (FIG. 6D). Here, since the thickness (slice width) at the time of slicing the block body becomes the display resolution, the width to be cut is determined in accordance with the resolution. Preferably, it is about 0.1 to 2.0 mm, but here it is about 0.4 mm.

  As can be seen from the cross-sectional view of FIG. 5B, the metal reflection film 6 is disposed at the boundary between the phosphor regions 5 of the respective colors. The metal reflection film 6 is formed only in one direction (for example, the z direction). The number of display lines in a certain direction is determined by the number of plates to be stacked. For example, when 640 display lines are desired, 640 plates may be stacked. At this time, when the thickness of the plate is 0.4 mm, the phosphor frame (phosphor screen) 7, that is, one side of the display screen size is 25.6 cm.

  Finally, an ultraviolet absorbing film may be formed on one surface (observer side) of the phosphor frame (phosphor screen) 7 (not shown).

  After producing the phosphor frame (phosphor screen) 7 in this way, a display device for a game machine can be produced.

  That is, as shown in FIG. 10, the phosphor frame (phosphor screen) 7 is attached to the front panel 21 of the display device for game machines (may be integrated). At this time, when the ultraviolet absorption film is formed on the phosphor frame (phosphor screen) 7, the ultraviolet absorption film is arranged closer to the viewer than the phosphor frame (phosphor screen) 7. Then, a solid light source (in this case, an ultraviolet laser) 2 and a scanning means (scanning mechanism) 8 are arranged so that laser light is irradiated onto the phosphor frame (phosphor screen) 7. In the example of FIG. 10, the laser beam is irradiated obliquely onto the phosphor frame (phosphor screen) 7, so that the observer cannot see the scanning means (scanning mechanism) 8. ing.

  Here, the orientation of the phosphor frame (phosphor screen) 7 in the z direction is set so as to be in the horizontal direction (main scanning direction), the vertical direction (sub-scanning direction), or other directions with respect to the observer. can do. The orientation of setting may be changed depending on the application, but in particular, when either is acceptable, it is desirable in terms of scanning that the orientation of the phosphor frame (phosphor screen) 7 in the z direction is the vertical direction (sub-scanning direction). (See FIG. 7). That is, the display generally scans horizontally, and the phosphor frame (phosphor screen) 7 in which the orientation of the phosphor frame (phosphor screen) 7 in the z direction is horizontal is shown in FIG. When the horizontal scanning is performed as described above, the same color is always emitted in a certain scanning (horizontal scanning). In this case, since there is no metal reflective film 6 between the pixels, there is a concern that the image is easily blurred due to the influence of secondary excitation or the like. On the other hand, when the phosphor frame (phosphor screen) 7 in which the direction of the z direction of the phosphor frame (phosphor screen) 7 is vertical is horizontally scanned as shown in FIG. ) Emits a different color for each pixel. In this case, since the metal reflection film 6 is provided between the pixels and there is no influence such as secondary excitation, a clear image can be easily obtained. As shown in FIG. 9, the metal reflecting film 6 can be formed in both the x direction and the z direction. When the metal reflecting film 6 is formed in both the x direction and the z direction, there is no particular limitation. A clear image can be obtained.

  A display method will be described in the case of FIG. 7 in which the direction of the z direction of the phosphor frame (phosphor screen) 7 is the vertical direction (sub-scanning direction).

  The number of scanning lines in the vertical direction (sub-scanning direction) of the phosphor frame (phosphor screen) 7 can be determined by the polygon mirror 12 for vertical scanning (sub-scanning). If the number of scanning lines in the vertical direction (sub-scanning direction) is 480, for example, scanning is performed so as to divide 480 with respect to the length Ez (= Dz) in the z direction of the phosphor frame (phosphor screen) 7. To do. Specifically, the length Ez (=) in the z direction of the phosphor frame (phosphor screen) 7 in synchronization with one cycle in which one side of the polygon mirror 11 for horizontal scanning (main scanning) scans. It is sufficient to move by 1/480 of Dz). An image can be formed by turning on / off the laser 2 in synchronization with the polygon mirror 11 for horizontal scanning (main scanning). When a certain color is desired to be displayed, the laser 2 is turned on only at the moment when the polygon mirror rotates in a direction in which the laser beam is irradiated to a predetermined position of the phosphor frame (phosphor screen) 7 having the color. At this time, gradation display can also be performed by controlling the ON time. It should be noted that high precision alignment (positioning) is required at the time of installing the display device for game machines, but it may be set at the initial stage. In particular, when the size of one pixel is about 0.4 mm as in this example, alignment is not so difficult.

  A phosphor frame (phosphor screen) 7 irradiated with laser light is excited by ultraviolet rays and emits visible light of a predetermined color. In the case of the configuration shown in FIG. 10, light is incident obliquely, but even if UV light that has not been excited yet hits the side surface of the metal reflective film 6, the possibility of being reflected and excited can be obtained. Therefore, it was possible to obtain light emission with high luminance.

  In the second example of the present invention, for example, a semiconductor laser (blue laser) that emits blue light having an emission wavelength of about 440 nm to about 490 nm (for example, 460 nm) is used as the solid-state light source 2. Phosphor screen 5, red phosphor region R, green phosphor region G, blue phosphor region B, phosphor transparent region such as resin or glass, red phosphor, green phosphor, weak scattering, respectively. It is a display device for automobiles using a mixture of bodies (dispersed and mixed so as not to aggregate).

  The entire configuration of the automobile display device of the second example is produced by displaying a display having the following basic configuration on the front panel (transparent panel) of the instrument panel of the automobile.

  Here, the basic configuration is to scan the light from the blue laser as the solid state light source 2 and to irradiate it while scanning the phosphor frame (phosphor screen) 7. Each type of nanophosphor is dispersed and mixed in the red phosphor region R and the green phosphor region G of the phosphor region 5 of the phosphor frame (phosphor screen), and these are dispersed by blue light. Excited to emit visible lights R and G having different wavelengths. Further, in the blue phosphor region B of the phosphor region 5 of the phosphor frame (phosphor screen) 7, a weak scatterer is dispersed and mixed on a transparent substrate such as resin or glass. The visible light B is emitted.

  In such a display device for automobiles, the phosphor frame (phosphor screen) 7 is usually transparent, so that when not displayed, the observer (driver) can see the inside of the panel as it is.

  FIG. 11 is a diagram showing a display device for an automobile according to a second example. In FIG. 11, the same reference numerals are assigned to the same portions (or corresponding portions) as in FIG. 4. In FIG. 11, the light source control means 3 and the scanning control means 9 are not shown.

  In an automobile display device, for example, a projected image is drawn on the surface of a protection panel (transparent panel) of an instrument panel, and at least a solid light source (in this case, a blue laser) 2 and scanning means (scanning mechanism) 8 And a phosphor frame (phosphor screen) 7, and these components are respectively fixed and held.

  Specifically, the scanning unit 8 is disposed on the optical axis of the solid light source 2. As the scanning means 8, a micro scanning mirror (MEMS mirror) capable of driving a minute mirror at high speed by a micro-electro-mechanical system (MEMS) technique was used. Here, the MEMS mirror has both functions of the horizontal scanning mirror 11 and the vertical scanning mirror 12.

  Further, the phosphor frame (phosphor screen) 7 is arranged at the rear stage of the scanning means 8 and arranged on the back side of the instrument panel protection panel (transparent panel). The phosphor frame (phosphor screen) 7 is obtained by mixing a phosphor with a transparent substrate such as resin or glass. Details will be described later.

  More specifically, the phosphor frame (phosphor screen) 7 is disposed in a portion where the laser light is projected. In this case, it is necessary to match the position where the laser beam is irradiated with the position of the partially formed phosphor, but this can be adjusted by adjusting the scanning means 8 or the timing of turning on / off the laser beam from the solid light source 2. The positional accuracy is not so required. That is, high-precision adjustment is required at the time of adjustment, but it may be adjusted once.

  An example of the manufacturing process of the phosphor frame (phosphor screen) 7 in the second example is the same as shown in FIGS. 6 (a), (b), (c), and (d).

  That is, first, as three types of phosphor regions 5, a red phosphor plate R, a green phosphor plate G, and a blue phosphor plate B are prepared (FIG. 6A). Here, each of the plates R, G, and B is, for example, a nanophosphor that emits red light under blue light irradiation, a nanophosphor that emits green light under blue light irradiation, and a predetermined light scattering light of blue light under blue light irradiation. A light scatterer is dissolved and mixed in a resin material and processed into a plate shape. The concentration to be mixed needs to be optimized depending on the thickness of the resin and the output of the laser. Here, about 10% nanophosphor particles and light scattering particles were mixed in the resin. When mixing, it is necessary to devise so that the nanophosphor particles do not aggregate. For example, aggregation may be prevented by surface modification of the particles (if the aggregation is severe, influence such as scattering tends to occur). Examples of the processing method include injection molding and extrusion molding, but are not particularly limited. The resin can be selected from, but not limited to, ABS (acrylonitrile / butadiene / styrene), silicone, polycarbonate, polystyrene, acrylic, epoxy resin, and the like. Although a transparent resin is desirable, a resin that scatters weakly (Haze) may be used. Since the thickness of the plate (plate thickness) is the resolution of the display, the thickness to be produced is determined according to the resolution. Preferably, it is about 0.1-2.0 mm, but here it is about 0.4 mm. In addition, phosphor plates that emit three colors of RGB (however, as for B of the three RGB colors, a light scattering plate that scatters blue light weakly instead of the phosphor plate as described above) were prepared. In the present invention, the light scattering plate is also referred to as a phosphor plate B for convenience of explanation.

  Next, a reflecting plate such as a metal thin film or a light shielding film such as a black pigment is formed on one or both surfaces of each of the plates R, G, and B (FIG. 6B). Here, the metal reflective film 6 made of silver alloy is formed with a thickness of about 200 nm on one side of the plate by sputtering.

  Next, a plurality of plates R, G, and B with the metal reflective film 6 thus produced were laminated in the order of RGB (FIG. 6C). Adhering with an adhesive applied between them, or heating and pressurizing, a block body formed by integrating these plural sheets was formed. The number of layers to be stacked is determined according to the size of the screen 7 to be obtained.

  Subsequently, the louver-like phosphor frame (phosphor screen) 7 is obtained by slicing the block body along a cut surface perpendicular to the sheet surface (FIG. 6D). Here, since the thickness (slice width) at the time of slicing the block body becomes the display resolution, the width to be cut is determined in accordance with the resolution. Preferably, it is about 0.1 to 2.0 mm, but here it is about 0.4 mm.

  As can be seen from the cross-sectional view of FIG. 5B, the metal reflective film 6 is disposed at the boundary between the phosphor regions (including the light scattering regions) 5 of the respective colors. The metal reflection film 6 is formed only in one direction (for example, the z direction). The number of display lines in a certain direction is determined by the number of plates to be stacked. For example, when 640 display lines are desired, 640 plates may be stacked. At this time, when the thickness of the plate is 0.4 mm, the phosphor frame (phosphor screen) 7, that is, one side of the display screen size is 25.6 cm.

  After producing the phosphor frame (phosphor screen) 7 in this manner, an automobile display device can be produced.

  That is, as shown in FIG. 11, the phosphor frame (phosphor screen) 7 is attached to the protection panel (front panel) 31 of the instrument panel (may be integrated). Then, a solid light source (in this case, a blue laser) 2 and a scanning means (scanning mechanism) 8 are arranged so that laser light is irradiated onto the phosphor frame (phosphor screen) 7. In the example of FIG. 11, since the laser beam is irradiated obliquely onto the phosphor frame (phosphor screen) 7, the scanning means (scanning mechanism) 8 cannot be seen from the observer (driver). It has a configuration.

  Here, the orientation of the phosphor frame (phosphor screen) 7 in the z direction is set so as to be in the horizontal direction (main scanning direction), the vertical direction (sub-scanning direction), or other directions with respect to the observer. can do. The orientation of setting may be changed depending on the application, but in particular, when either is acceptable, it is desirable in terms of scanning that the orientation of the phosphor frame (phosphor screen) 7 in the z direction is the vertical direction (sub-scanning direction). (See FIG. 7). That is, the display generally scans horizontally, and the phosphor frame (phosphor screen) 7 in which the orientation of the phosphor frame (phosphor screen) 7 in the z direction is horizontal is shown in FIG. When the horizontal scanning is performed as described above, the same color is always emitted in a certain scanning (horizontal scanning). In this case, since there is no metal reflective film 6 between the pixels, there is a concern that the image is easily blurred due to the influence of secondary excitation or the like. On the other hand, when the phosphor frame (phosphor screen) 7 in which the direction of the z direction of the phosphor frame (phosphor screen) 7 is vertical is horizontally scanned as shown in FIG. ) Emits a different color for each pixel. In this case, since the metal reflection film 6 is provided between the pixels and there is no influence such as secondary excitation, a clear image can be easily obtained. As shown in FIG. 9, the metal reflecting film 6 can be formed in both the x direction and the z direction. When the metal reflecting film 6 is formed in both the x direction and the z direction, there is no particular limitation. A clear image can be obtained.

  When considering the use of a car, for example, when the structure of a projection display is attached by attaching the phosphor frame (phosphor screen) 7 of the present invention to the protection panel (front panel) 31 of the instrument panel, from the passenger seat In the phosphor frame (phosphor screen) 7, the phosphor frame (phosphor screen) 7 has a louver-like configuration (that is, due to the metal reflection film 6), and thus the transparency is lowered and the image becomes difficult to see. However, since the transparency of the phosphor frame (phosphor screen) 7 is not necessary except for the driver, there is no particular problem. On the other hand, when scanning the laser according to the present invention to form a display of predetermined information on the phosphor frame (phosphor screen) 7, the phosphor frame (phosphor screen) 7 has a louver configuration. (I.e., even if the metal reflective film 6 is present), since the light-emitting display (that is, the light emitted from the phosphor frame (phosphor screen) 7) can be seen from the side, a predetermined information can be displayed also from the passenger seat. It can be confirmed (the driver looks clearer). Therefore, in the display device of the present invention, display of necessary information such as danger information and road information can be confirmed by the passenger in the passenger seat.

  A display method will be described in the case of FIG. 7 in which the direction of the z direction of the phosphor frame (phosphor screen) 7 is the vertical direction (sub-scanning direction).

  The number of scanning lines in the vertical direction (sub-scanning direction) of the phosphor frame (phosphor screen) 7 can be determined by the scanning means (MEMS mirror) 8. If the number of scanning lines in the vertical direction (sub-scanning direction) is 480, for example, scanning is performed so as to divide 480 with respect to the length Ez (= Dz) in the z direction of the phosphor frame (phosphor screen) 7. To do. Specifically, in synchronization with one cycle in which the scanning means (MEMS mirror) 8 scans in the horizontal direction, the length Ez (= Dz) of 1 / Z in the z direction of the phosphor frame (phosphor screen) 7 is obtained. It only needs to move by 480. An image can be formed by turning on / off the laser 2 in synchronization with the horizontal scanning (main scanning direction) of the scanning means (MEMS mirror) 8. When a certain color is to be displayed, the laser 2 is turned on only at the moment when the scanning means (MEMS mirror) 8 is positioned in a direction in which the laser beam is irradiated to a predetermined position of the phosphor frame (phosphor screen) 7 having the color. To. At this time, gradation display can also be performed by controlling the ON time. It should be noted that high precision alignment (position alignment) is required when installing the automobile display device, but it may be set at the initial stage. In particular, when the size of one pixel is about 0.4 mm as in this example, alignment is not so difficult.

  The phosphor frame (phosphor screen) 7 irradiated with the laser light is excited by the blue laser light to emit visible light of a predetermined color. In the case of the configuration as shown in FIG. 11, light is incident obliquely, but even if blue laser light that has not been excited yet hits the side surface of the metal reflective film 6, there is a possibility of being reflected and excited. Therefore, light emission with high brightness could be obtained.

  In the above-described example, the case of instrument panel display has been described. However, the present invention can also be applied to uses (head-up display, window display, etc.) for displaying on a transparent portion such as a window.

  Further, when the phosphor frame (phosphor screen) 7 is produced using glass instead of resin, the phosphor frame (phosphor screen) 7 may be produced by applying heat and pouring the phosphor material into a mold while mixing and stirring. it can.

  In each of the above-described examples, a mechanical scanning mechanism such as a polygon mirror or a MEMS mirror is used as the scanning unit 8, but a non-mechanical scanning mechanism such as a liquid crystal lens or a liquid crystal prism may be used.

  In each of the above-described examples, the phosphor frame (phosphor screen) 7 is used as a sliced substrate. However, the sliced substrate is more fragile and more easily peeled off than a normal substrate. Alternatively, a transparent frame (phosphor screen) 7 may be attached. In this case, another transparent substrate may have an ultraviolet blocking function or the like. Note that when the sliced substrate is attached to another transparent substrate, it may be attached using an adhesive or the like.

  Further, as in each of the examples described above, the display device of the present invention is used with the phosphor frame (phosphor screen) 7 attached to, for example, a transparent panel. At this time, the phosphor frame is aligned with the transparent panel. (Phosphor screen) 7 may be curved. Furthermore, depending on the location, the thickness of the phosphor frame (phosphor screen) 7 can be increased, and the type (color) and concentration of the phosphor can be changed depending on the location.

  In the above-described example, when the phosphor frame (phosphor screen) 7 is used in the arrangement of FIGS. 7 and 9, the x direction of the phosphor frame (phosphor screen) 7 is as shown in FIG. When attached as shown in a), the partition wall 6 of the phosphor frame (phosphor screen) 7 is configured in parallel with the normal direction P of the surface of the phosphor frame (phosphor screen) 7. Thereby, the observer can see the front without being obstructed by the partition wall 6 at the time of non-display, and can see the display of predetermined information at the time of display. On the other hand, when the x direction of the phosphor frame (phosphor screen) 7 is attached to the observer as shown in FIG. 12B, the partition wall 6 of the phosphor frame (phosphor screen) 7 is It is preferable that an angle θ is formed with respect to the normal direction P of the surface of the phosphor frame (phosphor screen) 7. Thus, even when the x direction of the phosphor frame (phosphor screen) 7 is attached to the observer as shown in FIG. 12B, the observer is blocked by the partition wall 6 when not displayed. It is possible to see the front without displaying, and at the time of display, the display of predetermined information can be seen.

  In the above-described example, when the phosphor frame (phosphor screen) 7 is used in the arrangement of FIGS. 8 and 9, the z direction of the phosphor frame (phosphor screen) 7 is as shown in FIG. When attached as shown in a), the partition wall 6 of the phosphor frame (phosphor screen) 7 is configured in parallel with the normal direction P of the surface of the phosphor frame (phosphor screen) 7. Thereby, the observer can see the front without being obstructed by the partition wall 6 at the time of non-display, and can see the display of predetermined information at the time of display. On the other hand, when the z direction of the phosphor frame (phosphor screen) 7 is attached to the observer as shown in FIG. 13B, the partition wall 6 of the phosphor frame (phosphor screen) 7 is It is preferable that an angle φ is formed with respect to the normal direction P of the surface of the phosphor frame (phosphor screen) 7. Thus, even when the z direction of the phosphor frame (phosphor screen) 7 is attached to the observer as shown in FIG. 13B, the observer is blocked by the partition wall 6 when not displayed. It is possible to see the front without displaying, and at the time of display, the display of predetermined information can be seen.

  The present invention can be used for various display applications.

2 Solid light source 3 Light source control means 5 Phosphor region 6 Partition wall 7 Phosphor frame (phosphor screen)
DESCRIPTION OF SYMBOLS 8 Scanning means 9 Scanning control means 11 Horizontal scanning mirror 12 Vertical scanning mirror 21 Front panel of display device for game equipment 31 Panel protection panel (front panel)

Claims (4)

A solid-state light source that emits light having a predetermined wavelength in a wavelength region from ultraviolet light to visible light as excitation light, light source control means that controls light emission of the solid-state light source based on predetermined data, and the solid-state light source A phosphor frame in which at least one type of phosphor region that is excited by the excitation light and emits fluorescence having a longer wavelength than the excitation light is alternately stacked by partition walls; Scanning means for scanning the phosphor frame with the excitation light, and scanning control means for controlling scanning by the scanning means. Light emission of the solid light source by the light source control means is performed by scanning by the scanning means. A display device controlled in synchronization with control. 2. The display device according to claim 1, wherein a phosphor material transparent to visible light is used for the phosphor region when the excitation light from the solid light source is not irradiated. . 3. The display device according to claim 2, wherein a metal complex or a nanophosphor is used in the phosphor region. 2. The display device according to claim 1, wherein the scanning unit sets a direction x in which at least one type of phosphor region of the phosphor frame is alternately stacked by partition walls as a main scanning direction, and at least of the phosphor frame. A display device that scans in the length direction z of one type of phosphor region as a sub-scanning direction.

Images