KR20090052730A - Display apparatus - Google Patents

Abstract

By changing the path of the light output from the light source and sequentially scanning on the inner screen, the red phosphor, green phosphor and blue phosphor included in the inner screen are respectively emitted and the emitted fluorescence is projected on the outer screen to complete the image on the outer screen. A display device is provided. According to the present invention, linear light can be generated in a narrow space while outputting uniform linear light in the longitudinal direction.

Internal screen, phosphor, polarization rotating part, polarization filter, optical modulator

Description

Display device {Display Apparatus}

The present invention relates to a display apparatus, and more particularly, to a display apparatus including an inner screen including a phosphor and an outer screen on which an image is formed by projecting fluorescence emitted from the phosphor.

Conventionally, a display apparatus used to sequentially output light output from a light source to a screen and output an image is described below with reference to FIG. 1.

First, the light output from the laser diode 100 is modulated through the beam modulator 105. The beam modulator 105 is driven by the beam driver 110 connected with the controller 115. The light modulated by the beam modulator 110 is reflected by the primary scanning mirror 128 and the reflected light is reflected back by the secondary scanning mirror 138 and irradiated to the screen 140.

The primary scanning mirror 128 is connected to the motor 125 to be rotated about the vertical axis, and the secondary scanning mirror 138 is connected to the motor 135 to be rotated about the horizontal axis.

Each of the motors 125 and 135 is rotated by the X-axis and Y-axis positioning drivers 120 and 130, and the respective position data is input by the controller 115. Therefore, the primary scanning mirror 128 and the secondary scanning mirror 138 rotate at high speed so that light is irradiated to the screen 140 at the position corresponding to the position data input by the controller 115.

The controller 115 receives input from a core processor included in the display apparatus or connected to the display apparatus, and processes location data.

Such a conventional display device must have both red, green, and blue laser diodes to complete a full color image. However, when three laser diodes are included, the display cannot be miniaturized due to the dedicated space and arrangement of the laser diodes. In particular, in the case of a green laser diode, it is difficult to realize the commercialization, and even when commercialized, the volume of the display including the green light source unit that outputs the desired green light becomes large.

In addition, there is a problem that the noise of the image generated due to the high-speed rotation of the beam modulator and the scanning mirror, the interference phenomenon of the light due to the three laser diodes inevitably occur.

Accordingly, the present invention has been made to solve the above-described problems, and provides a display device including only one light source and including an internal screen in which red, green, and blue phosphors are arranged.

The present invention also provides a display device including a polarization rotating unit capable of rotating a polarization direction of light irradiated according to a color arrangement of phosphors arranged on an inner screen.

The present invention also provides a display device including an optical modulator for moving a scanner in one dimension and allowing the scanner to output a two-dimensional image by irradiating linear light.

Other objects of the present invention will become more apparent through the preferred embodiments described below.

According to an aspect of the present invention for achieving the above object, a display device is provided.

In accordance with one embodiment of the present invention, a light source; A scanner which sequentially scans the path of the light output from the light source; An inner screen on which phosphors for emitting luminescent light are arranged by the sequentially scanned light; And a projection lens for condensing the fluorescence emitted from the phosphor and projecting the fluorescence to the external screen.

The phosphor is at least one or more of red phosphor, green phosphor, and blue phosphor emitting red, green, and blue, respectively, and the red phosphor, the green phosphor, and the blue phosphor are linearly arranged on the inner screen, respectively, to form a red phosphor layer. , A green fluorescent layer and a blue fluorescent layer can be formed.

The display device may further include a polarization rotating unit for rotating the polarization direction of the sequentially scanned light.

The polarization rotating unit may vertically rotate the polarization direction of the sequentially scanned light to correspond to the color of the fluorescent layer.

The polarization rotating unit may rotate the polarization direction of the sequentially scanned light alternately in accordance with the color of the fluorescent layer.

The light output from the light source may be UV light or blue laser beam.

The inner screen may include an irradiation surface to which the scanner irradiates the light; And a fluorescent surface on which the phosphor emits light by the irradiated light, and a polarization filter corresponding to the color of the fluorescent layer may be formed or attached to the irradiation surface.

The polarization filter may be alternately formed or attached to each of the fluorescent layer, a vertical polarization filter or a horizontal polarization filter.

The inner screen may include an irradiation surface to which the scanner irradiates the light; And a fluorescent surface on which the fluorescent material emits light by the irradiated light, wherein the fluorescent surface passes, and the irradiation surface passes through the irradiated light and reflects the fluorescent light emitted by the phosphor. Filter) can be formed or attached.

Luminescent light pass filters may be formed or attached to the fluorescent surface to reflect the irradiated light and to pass fluorescence emitted by the phosphor.

The irradiation light passing filter or the fluorescent passing filter may be formed to correspond to the color of the fluorescent layer.

The scanner may be a scanner, characterized in that to sequentially scan in two dimensions by changing the path of the light.

The light source may modulate and output light intensity according to a position where fluorescence is emitted from the inner screen.

According to another embodiment of the present invention, a light source for outputting light at a constant light intensity; A linear light modulator for modulating optical characteristics of light output from the light source to output linear modulated light; A scanner scanning the linearly modulated light in one dimension by changing a path of the linearly modulated light modulated by the linear light modulator; An inner screen on which phosphors which emit fluorescence by the sequentially scanned light are arranged; And a projection lens for condensing the fluorescence emitted from the phosphor and projecting the fluorescence to the external screen.

 The phosphors may be linearly arranged in a longitudinal direction of linearly modulated light sequentially scanned by the scanner to form a fluorescent layer.

The phosphor is at least one or more of red phosphor, green phosphor, and blue phosphor emitting red, green, and blue, respectively, and the red phosphor, the green phosphor, and the blue phosphor are red phosphor, green phosphor, and blue phosphor, respectively. A layer can be formed.

The linear light modulator may output a linearly modulated light to the scanner by arranging a plurality of micro mirrors in a linear manner.

The light output from the light source is non-linear light, and the display apparatus further includes a linear light generating unit for converting the non-linear light into linear light, wherein the optical modulator modulates the linear light modified by the linear light generating unit to Linear modulated light can be output.

The display device may further include a polarization rotating unit configured to rotate the polarization direction of the linearly modulated light sequentially scanned.

The inner screen includes an irradiation surface to which the scanner irradiates the linearly modulated light; And a fluorescent surface on which the phosphor emits light by the irradiated light, wherein a vertical polarization filter or a horizontal polarizing filter may be alternately formed or attached to the irradiation surface according to the color of the fluorescent layer.

The inner screen may include an irradiation surface to which the scanner irradiates the light; And a fluorescent surface on which the fluorescent material emits light by the irradiated light, wherein a fluorescent light passing filter is formed or attached to the irradiation surface to allow the irradiated light to pass and reflect the fluorescent light emitted by the phosphor. Can be.

The fluorescent surface may be formed or attached with a fluorescence pass filter for reflecting the irradiated light and passing the fluorescence emitted by the phosphor.

As described above, according to the present invention, there is an effect of generating a complete color image by irradiating an internal screen including the phosphor with one light source without the need of a plurality of light sources.

In addition, the volume of the display device can be greatly reduced by using only one light source, and thus it can be used for small mobile devices.

In addition, by passing the irradiated light through the polarization rotating unit, the polarization direction of the light irradiated to each fluorescent layer is different from each other, thereby reducing the color interference between the respective fluorescent layers.

In addition, by passing through the polarization rotation to each of the vertically polarized irradiation light through a horizontal or vertical filter corresponding to the fluorescent layer to prevent the irradiation light into the adjacent fluorescent layer to reduce the color interference and speckle noise There is.

In addition, by linearly modulating the shape of the light irradiated onto the inner screen and entering the linear light modulator, the scanner can irradiate light only in one dimension, thereby reducing the mechanical loss of the scanner.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals regardless of the reference numerals. Duplicate explanations will be omitted.

2 is a diagram illustrating a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a display device according to an exemplary embodiment may include a light source 200, an internal projection lens 210, an inner projection lens 210, a scanner 220, an inner screen 230, and an external projection lens. (240) (Outer Projective Lens).

The external screen 250 is a screen on which an image projected through the external projection lens 240 is formed and is positioned outside the display device. The light may be a white plane in which red, green, and blue light of the external screen are projected to project a color image.

The light source 200 may be configured as a UV lamp or a semiconductor laser that outputs a UV (Ultra Violet) beam or a blue laser beam. However, the kind of the light source 200 is not limited thereto, and includes all kinds of light sources that may be used to cause fluorescence of the phosphor of the internal screen 230 to be described later. As will be described later, a complete color image can be completed by emitting red, green, and blue phosphors by irradiating a beam to the inner screen 230, so that the display device according to the present embodiment includes both red, green, and blue light sources separately. There is no need to do it.

The light source 200 may be connected to an image controller (not shown) to adjust a light intensity corresponding to each pixel of the image according to a signal input from a main processor (not shown) or an embedded processor (not shown) to output a beam. have.

The beam output from the light source 200 passes through the internal projection lens 210. The internal projection lens 210 may change the shape of the beam output from the light source. The term "inner" is meant to be included in the position projecting the beam irradiated from the light source before being irradiated to the inner screen. On the contrary, the "outside" of the external projection lens 250 to be described later means that the fluorescence emitted from the internal screen is projected to complete the image on the external screen 250. That is, the user of the display device may recognize the completed image through the external screen 250.

The path of each of the light streams constituting the beam passes through the internal projection lens 210 and causes refraction to the center of the beam, thereby reducing the traveling cross section of the beam. The changing cross section of the beam is to prevent the image from being completed because the beam output from the light source 200 is not collimated or condensed and is not irradiated correctly to the scanner 220.

Therefore, when the beam passes through the internal projection lens 210, a beam having a reduced traveling cross section may reach the scanner 220. The scanner 220 reflects the beam irradiated from the inner projection lens 210 at a predetermined angle and projects the beam onto the inner screen 230. In this case, the predetermined angle is determined by a scanning control signal input from an image controller (not shown). The scanning control signal rotates the scanner 220 at an angle at which the beam can be projected on the inner screen 230 corresponding to the image control signal in synchronization with the image control signal. The image control signal is a signal that controls each component inside the display device to adjust the light intensity output from the light source 200 to correspond to pixel value information of red, green, and blue corresponding to each pixel of the image.

Therefore, the scanning control signal synchronized with the image control signal includes information about the driving angle and the driving speed of the scanner 220, and the scanner 220 is located at a specific position at a specific time according to the driving angle and the driving speed. . The scanner 190 may be a polygon mirror, a rotating bar, a galvano mirror, or the like. The scanner 220 may be composed of two modules, a horizontal module that rotates in the horizontal direction and a vertical module that rotates vertically and vertically, and may irradiate the entire area of the two-dimensional plane vertically, horizontally, and horizontally as one module. .

The scanner 220 reflects the beam while rotating and sequentially irradiates the inner screen 230. That is, the scanner 200 may sequentially scan the entire area of the internal screen 230 in a progressive manner by the scanning control signal. However, it will be apparent to those skilled in the art that the scanning method of the scanner 220 included in an embodiment of the present invention may be replaced by an interlace method.

The inner screen 230 is positioned at the position where the light is irradiated by the scanner 220. The inner screen 230 is composed of various kinds of optical materials through which light can be transmitted, and phosphors may be arranged therein. For example, the entire inner screen 230 may be made of glass or air and phosphors may be arranged therein.

Phosphors are generic names for materials that absorb external energy and emit visible light. Phosphors are classified into red phosphors that emit red luminescence (Luminescent Light), green phosphors that emit green light, and red phosphors that emit blue light, depending on the type.

Cadmium borate or the like may be used as the red phosphor, and a metal or eosin of zinc silicate, a dye of prulorosein, chlorophyll, or a canary glass containing uranium oxide may be used as the green phosphor. In addition, calcium tungstate, fluorite, or the like may be used as the blue phosphor. However, it is obvious that the parent material of each phosphor is not limited thereto and may be replaced with various phosphors.

The phosphors arranged on the inner screen 230 are arranged in a line according to the color of the fluorescence emitting light as described above to form a strip-shaped red phosphor layer, a green phosphor layer and a blue phosphor layer, respectively. Form. Accordingly, the inner screen 230 may be a flat screen in which a red fluorescent layer, a green fluorescent layer, and a blue fluorescent layer are sequentially positioned, such as a rainbow composed of a red band, a green band, and a blue band. The specific gravity of the phosphor in the total volume of the inner screen 230 depends on the manner or ratio of including the phosphor in the inner screen 230. For example, the density of the phosphor may vary depending on the level of doping the phosphor on the inner screen 230. Shapes of the inner screen 230 and the respective fluorescent layers arranged on the inner screen 230 will be described in more detail with reference to FIGS. 3 and 4.

The above-described scanner 220 sequentially scans the beams sequentially on the respective fluorescent layers of the inner screen 230. The beam stimulates the phosphors to induce light emission. That is, the phosphor absorbs the energy of the irradiated beam and emits a unique color of the phosphor. Thus, each of the fluorescent layers of red, green, and blue emits red, green, and blue light, respectively.

For example, the red fluorescent layer, green fluorescent layer, blue fluorescent layer, red fluorescent layer, green fluorescent layer,... It may be assumed that the fluorescent layers are arranged in the order of the green fluorescent layer and the blue fluorescent layer. In this case, the scanner irradiates a beam from one end of the red fluorescent layer to the other end and then irradiates light from one end of the green fluorescent layer G-1 to the other end. Sequential scans can be performed.

For example, when displaying an image of 720 x 480 pixels, the length of each fluorescent layer is responsible for a pixel value of 720 pixels, and the total number of fluorescent layers must be 720 x 3 (R, G, B). That is, when the length of the red fluorescent layer is 10 cm, 1/720 times the length of 10 cm should emit fluorescence corresponding to the red pixel value of one pixel.

As a result of the sequential scanning, the fluorescence emitted from the red fluorescent layer is first projected through the external projection lens 240 to the external screen 250. Subsequently, fluorescence emitted from the green fluorescent layer is projected onto the external screen 250, and fluorescence emitted from the blue fluorescent layer is projected onto the external screen 250. Therefore, in the above example, when the sequential irradiation is completed from the red fluorescent layer at the top of the inner screen to the blue fluorescent layer at the bottom, one frame is completed on the external screen 250. That is, as described above, the light output from the light source 200 emits fluorescent light by adjusting the intensity of red, green, and blue light of each pixel whenever the fluorescent layer corresponding to each pixel is irradiated. An image consisting of a combination of green and blue can be completed.

The external projection lens 240 collects the fluorescence emitted from the inner screen 230 and serves to project the corresponding pixel position on the screen. Although the external projection lens 240 is illustrated as a single lens in FIG. 2, it may be configured as a set of a plurality of lenses, which is apparent to those skilled in the art. The condensed light is projected onto the external screen 250 to generate a full color image, and the user can recognize the image through the external screen 250.

Hereinafter, the structure of the inner screen will be described in more detail with reference to FIGS. 3 to 4.

3 is a diagram illustrating a structure of an internal screen included in a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the inner screen 230 is repeatedly arranged in the order of the red fluorescent layer R-1, the green fluorescent layer G-1, and the blue fluorescent layer B-1 from the top. Red, green, blue,... Arranged in the order of red, green, and blue is merely an arrangement of the fluorescent layer according to an embodiment of the present invention, and red, green, blue,... The order of red, green and blue can be changed.

Arrow-shaped dotted lines appearing in each fluorescent layer represent a path through which the scanner 220 sequentially irradiates the beams. That is, the irradiated beam irradiates the beam from the left side to the right side of the inner screen 230 of FIG. 2, and sequentially irradiates the beam from the uppermost red fluorescent layer to the lowest blue fluorescent layer. The left side and the right side are terms used with reference to FIG. 3 for the convenience of description and are not limited to the left side and the right side of the display device of the present invention.

The elliptical mark formed on the blue fluorescent layer B-1 disposed third from the top thereof indicates the shape of the beam currently being scanned by the scanner 220.

“11” displayed to the right of the fluorescent layer of red (R-3), green (G-3) and blue (B-3) at the bottom of the inner screen 230 represents one pixel. That is, while the irradiated light irradiates the red fluorescent layer R-3, the light emitted from the red fluorescent layer R-3 is projected to the opposite side of the inner screen 230 to be reflected on the outer screen 250. Subsequently, light irradiated from the green fluorescent layer and the blue fluorescent layer is sequentially reflected on the external screen 250 to form a completed pixel value of one pixel. That is, the image corresponding to pixels 1 to 10 is projected onto the external screen 250 at the left side of the “11”.

Accordingly, three adjacent fluorescent layers R-3, G-3, and B-3 are in charge of forming pixel values of pixels corresponding to the same column among images formed on the external screen 250.

4 is a diagram illustrating a configuration of a display apparatus according to another embodiment of the present invention.

Referring to FIG. 4, other configurations are the same except that the apparatus further includes a polarization rotator 260 when compared to the display device described with reference to FIG. 2. Hereinafter, the polarization rotating unit 260 will be described.

The light constituting the beam is an electromagnetic wave, which propagates while the electric and magnetic fields vibrate. The electric and magnetic fields vibrate perpendicularly to the traveling direction while being perpendicular to each other. However, the beam output from the light source 200 passes through the internal projection lens 210 and is irradiated to a predetermined area of the inner screen 230 through the scanner 220, but the vibration planes of the electric field and the magnetic field have the same probability of multiple planes. do.

However, even if the beam is output from the same light source 200, by filtering the vibration plane of the electric field and the magnetic field of the advancing beam, it is possible to change the optical characteristics of the advancing beam. That is, the light includes a first vibration plane, a second vibration plane, a third vibration plane,... In addition, the N th vibration plane may exist, and the optical characteristics may be different from each other by filtering the polarization having only the first vibration plane or the polarization having only the N th vibration plane.

The polarization rotating unit 260 applying this principle performs a function of rotating the polarization direction of the beam. Since the polarization rotating unit 260 is present between the scanner 220 and the inner screen 230, the polarization rotating unit 260 rotates the polarization direction of the beam irradiated to the inner screen 230.

The polarization rotating unit 260 may be a liquid crystal (LC) polarization rotating unit. Liquid crystal means that the molecules are in an intermediate state between the state of complete regularity seen in a solid and the irregular state as seen in a conventional isotropic liquid.

However, in the liquid crystal state, the arrangement of the liquid crystal molecules changes when an electric field is applied from the outside, and polarizes light irradiated onto the inner screen using the liquid crystal. That is, when the electric field is transmitted to the liquid crystal applied in one direction before the inner screen is irradiated, the light is filtered and polarized while leaving only the same vibration plane as the electric field applied in one direction. That is, the beam may be polarized in a specific direction according to the arrangement of the molecules.

In addition, when the electric field is rotated perpendicularly to the direction of the previous electric field or when the applied electric field is removed, the vibrating plane remaining in the light passing through the liquid crystal becomes polarized light in which only the vibrating plane perpendicular to the previous electric field remains.

Therefore, in the case of the liquid crystal polarization rotating unit, the polarization direction can be rotated according to the direction of the electric field applied from the external field. In this case, the polarization directions of the light irradiated to the red fluorescent layer and the green fluorescent layer may be rotated perpendicularly to each other in the order of irradiation to the inner screen 230.

The period in which the polarization rotating unit 260 rotates the polarization direction of the beam is a time period in which the fluorescent layer is irradiated when the red fluorescent layer, the green fluorescent layer, or the blue fluorescent layer described with reference to FIG. 3 are irradiated.

Therefore, the polarization direction of the beam irradiated onto the fluorescent layers classified by colors is different for each fluorescent layer of each color. Since the light emission characteristics of the phosphors constituting the phosphor layers of the respective colors are different, the optical characteristics of the irradiated light, which is a condition of the fluorescence of the phosphor, may be changed to reduce interference between the fluorescence emitted from each phosphor layer.

5 is a diagram illustrating a configuration of an internal screen included in a display device according to another embodiment of the present invention.

Referring to FIG. 5, the fluorescent layers are arranged in the order of the red fluorescent layer R-1, the green fluorescent layer G-1, and the blue fluorescent layer B-1 in the same manner as the inner screen 230 described with reference to FIG. 3. It is.

However, this is only an example of the internal screen 230 included in the display device of the present invention, and differently from FIG. 5, the green fluorescent layers are additionally arranged so that the red, green, blue and red colors of the red, green, blue and green fluorescent layers are different. The arrangement may be configured to repeat. That is, the green fluorescent layer (G), the red fluorescent layer (B) or the blue fluorescent layer (B) may be added to reduce the interference between the pixel groups generated while the scanner 220 irradiates one fluorescent layer. have.

The polarization direction of the beam irradiated to the red fluorescent layer R-1 of FIG. 5 is a vertical direction. The polarization direction is expressed based on the electric field E and the direction of the magnetic field is perpendicular thereto.

The polarization direction of the beam irradiated to the red fluorescent layer R-1 is vertical and vertical because the light polarized in the vertical and vertical directions through the polarization rotating unit 260 is irradiated.

While the scanner 220 irradiates light from the left end to the right end of the red phosphor layer R-1, the polarization rotating unit 260 allows the polarization direction of the light to be the vertical direction.

Thereafter, when the scanner 220 irradiates the green fluorescent layer G-1 under the red fluorescent layer R-1, the beam polarized in the horizontal direction is irradiated. In addition, when the scanner 220 irradiates the blue fluorescent layer B-1, the beam polarized again in the vertical direction is irradiated.

Therefore, light polarized in directions perpendicular to each other is irradiated to both adjacent fluorescent layers. In this case, when a polarizing filter (not shown) is formed on the light irradiation surface of the inner screen 230, only the polarized light corresponding to each fluorescent layer emits the phosphor.

Therefore, the fluorescence emitted by the light polarized perpendicularly to each other in each fluorescent layer does not interfere with each other to prevent color crosstalk.

6 is a view showing in detail the configuration of the internal screen included in the display device according to another embodiment of the present invention.

Referring to FIG. 6, a portion of the inner screen 630 is shown. That is, the red phosphor layer 631 includes a phosphor 631p for emitting red light, a phosphor for emitting green light in the green phosphor layer 632, and a phosphor for emitting blue light in the blue phosphor layer 633. have. The material of the inner screen 630 may be an optical material such as glass, air, or the like, and may be doped with phosphors to form red, green, and blue phosphor layers, respectively.

The difference between the inner screen 230 of FIG. 3 and the polarization filters 631f, 632f, and 633f is formed or attached to the surface of the inner screen 630 to which light is irradiated. Is the point. The polarization filters 631f, 632f, and 633f are not formed on one surface of the inner screen 630, but filters having vertical polarization directions are formed in adjacent fluorescent layers.

That is, the inner screen includes both sides of the fluorescent surface, an irradiation surface on which the beam is irradiated, and a surface on which the fluorescent material contained in the inner screen emits light so that the fluorescence proceeds toward the external screen. Among them, a filter formed of one surface is not attached to the irradiated surface to which the beam is irradiated, but a polarizing filter having a polarization characteristic in the vertical direction at each intersection is formed or attached to each surface on which the fluorescent layer is changed.

For example, a vertical filter 631f may be formed in the red fluorescent layer 631 so that only beams polarized in the vertical direction may pass through, and only light polarized in the left and right horizontal directions may pass through the green fluorescent layer 632. Horizontal filter 632f is formed.

That is, as described with reference to FIG. 4, the beams irradiated to the red fluorescent layer 631, the green fluorescent layer 632, and the blue fluorescent layer 633 are vertically polarized, and therefore, each of the fluorescent layers 631, 632, and 633 are vertical. The beam irradiating the adjacent fluorescent layer does not flow into.

This will be described in more detail as follows.

The arrow of FIG. 6 shows the light emission time point when the scanner 220 irradiates the green fluorescent layer 632. As described with reference to FIG. 4, the beam irradiated to the green fluorescent layer passes horizontally from side to side while passing through the polarization rotating part. It has a polarization direction.

Therefore, the polarization filter 632f formed on the irradiation surface of the green fluorescent layer 632 passes only the light polarized in the horizontal direction. On the other hand, the polarization filters 631f and 633f formed on the irradiation surfaces of the red fluorescent layer 631 and the blue fluorescent layer 633 pass only the light polarized in the vertical direction.

When the scanner 220 irradiates the green fluorescent layer 632, the scanner 220 irradiates a beam having a polarization direction in the horizontal direction as described above, and thus passes through the polarization filter 632f formed on the irradiation surface of the green fluorescent layer 632. The green phosphor emits light.

However, since only the light polarized in the vertical direction may pass through the inner surfaces of the red fluorescent layer 631 and the blue fluorescent layer 633 which are adjacent to the green fluorescent layer 632 up and down, the light irradiated to the green fluorescent layer 632 It does not flow into the red fluorescent layer 631 or the blue fluorescent layer 633.

As described above, blocking the incoming light by irradiating adjacent light using a polarizing filter causes light emission from another fluorescent layer due to the influence of the beam irradiated to the corresponding fluorescent layer, and the speckle noise caused by interference in the external screen where the image is completed. Because it occurs.

That is, the height of the irradiation surface of the beam irradiated through the internal projection lens 210 and the scanner 220 described in FIG. 2 may not be exactly the same as the height of the green fluorescent layer 632. In particular, when used in a small mobile device, the height of each fluorescent layer of the inner screen may be only a few μm to mm, and it may be very difficult to accurately irradiate each phosphor with the height of the irradiated beam. Therefore, light may be irradiated to the red fluorescent layer 631 or the blue fluorescent layer 633 adjacent to the green fluorescent layer 632 up and down.

In this case, the beam irradiated from the light source 200 is modulated and output by the light intensity to project the green light of each pixel to the image, so that when the light enters the fluorescent layers 631 and 633 other than the green fluorescent layer 632, The blue phosphor emits light, so that accurate RGB representation is impossible. However, polarization filters 631f, 632f, and 633f are formed in each fluorescent layer in the internal screen 230 included in the display device according to the exemplary embodiment, and the polarization rotation unit 260 polarizes each adjacent fluorescent layer. By irradiating light having a vertical direction, beams irradiated to adjacent fluorescent layers 631 and 633 in addition to the green fluorescent layer 632 may be blocked to prevent color interference.

The polarization filters 631f, 632f, and 633f described above prevent interference between the fluorescence emitted from the phosphor so that speckle noise is not generated on the external screen 250 through the external projection lens 240. Speckle noise refers to an irregular light intensity distribution caused by interference of finely varying light. As a result, the speckle noise deteriorates the quality of the image on the external screen 250 on which the image is formed.

Accordingly, the display device according to an embodiment of the present invention can generate an image with reduced speckle noise even when used in a small electronic device such as a mobile device.

7 is a diagram illustrating a configuration of an internal screen included in a display device according to another embodiment of the present invention.

Referring to FIG. 7, the filters 731f, 732f, 733f, 731f / o 732f / o, and 733f / o are included in the irradiation surface and the fluorescent surface of the inner screen 730. Filters 731f, 732f, 733f, 731f / o 732f / o, and 733f / o of the irradiated surface and the fluorescent surface are the same as the polarization filters 631f, 632f, and 633f described in FIG. Each of the 732 and the blue fluorescent layer 733 is formed or attached to each other.

The irradiation surface filters 731f, 732f, and 733f and the fluorescent surface filters 731f / o 732f / o and 733f / o of FIG. 7 filter the irradiation light as well as the functions of the polarization filters 631f, 632f, and 633f described with reference to FIG. Or filter the fluorescence.

Irradiation surface filters 731f, 732f, and 733f pass irradiated light and reflect fluorescence. That is, the irradiation surface filter corresponds to an incident light pass filter. In addition, the fluorescent screen filters 731f / o 732f / o and 733f / o pass through the fluorescence and reflect the irradiated light to the fluorescent light filter.

The irradiating light passing filter passes a beam irradiated to the inner screen 730, but the fluorescence is a filter that passes the UV light having a wavelength of about 380 nm or less emitted from the light source and irradiated when the light source is a UV lamp. have.

On the other hand, in the case of the fluorescence passing filter, the light wavelength of the fluorescence emitted from the green phosphor 732 is about 540 nm to 580 nm, so a filter that can pass only the region of the corresponding light wavelength may be used.

An optical filter is a filter that can pass only light of a predetermined wavelength by using a multilayer deposition film, which is obvious to those of ordinary skill in the art, and thus is formed on the inner screen of the present invention. The process through which the respective beams fluoresce the beams irradiated with the filters 731f, 732f, 733f, 731f / o 732f / o, and 733f / o will be described.

As a result, the irradiated light emitted from the scanner 220 passes through the irradiation surface filters 731f, 732f, and 733f to emit phosphors, and reflects the fluorescence coming out of the fluorescence emitted from the phosphors toward the irradiation surface to proceed to the fluorescent surface. .

Therefore, the reflected fluorescence proceeds back to the fluorescent surface and passes through the fluorescent surface filter. Therefore, the improved light efficiency can be ensured as compared with the case where there are no irradiation surface filters 731f, 732f, and 733f. That is, when there are no irradiation surface filters 731f, 732f, and 733f, only the fluorescence emitted by the fluorescent surface among the fluorescence emitted from the phosphor is projected on the external screen 250. According to the display device according to an embodiment of the present invention, In addition, the fluorescence emitted from the irradiation surface may be reflected to be projected onto the external screen 250.

The fluorescent screen filters 731f / o 732f / o and 733f / o pass the fluorescence and reflect the irradiation light. That is, all the light traveling to the fluorescent surface of the fluorescence emitted by the phosphor due to the irradiated beam passes through and is projected onto the external screen 250. However, in the case of light reaching the fluorescent surface filter (731f / o 732f / o, 733f / o) through the space between the phosphors without irritating the phosphor in the irradiated beam, the fluorescent surface filter (731f / o 732f / o, 733f / o ) Is reflected in the irradiation surface direction.

In addition, when the reflected light travels inward to stimulate the phosphor, the phosphor emits fluorescence in all directions again. Also in this case, the fluorescence emitted by the fluorescent surface passes through the fluorescent surface filters 731f / o 732f / o and 733f / o, and the fluorescence emitted by the irradiation surface is reflected by the irradiation surface filters 731f, 732f and 733f, and proceeds to the fluorescent surface. Is projected onto the external screen 250 through the external projection lens 240.

The irradiation surface filters 731f, 732f, and 733f and the fluorescent surface filters 731f / o 732f / o and 733f / o can greatly improve light efficiency compared to the case where the same beam is irradiated without a filter.

8 is a diagram illustrating a display device according to another embodiment of the present invention.

Referring to FIG. 8, the display apparatus includes a light source 800, a collimating lens 810, a collimating lens, a linear beam generator 820, a condenser lens, and a light modulator 840. (Optical Modulator), the internal projection lens 850, the scanner 860, the inner screen 870, the external projection lens 880.

The external screen 890 corresponds to a screen on which a fluorescence projected from the external projection lens 880 of the display device is irradiated to form a full color image. In the case of a bright color, for example, a white plane, regardless of its material It can be utilized as screen 890.

As described above with reference to FIG. 2, the light source 800 may be configured as a UV lamp or a semiconductor laser that outputs a UV (Ultra Violet) beam or a blue laser beam. As will be described later, the display device of FIG. 8 also emits red, green, and blue phosphors by irradiating a beam to the inner screen 870, thereby completing a complete color image. Therefore, it is necessary to separately provide both a red, green, and blue light source. There is no.

Unlike the display device described with reference to FIG. 2, the beam output from the light source is not transmitted to the scanner 860 through the internal projection lens 850, but the beam output from the light source 800 is modulated through the optical modulator 840. After that, the scanner 860 is reached through the internal projection lens 850.

By including the optical modulator 840 between the light source 800 and the scanner 860, the display device may control the optical characteristics of the beam output from the light source 800 through the optical modulator 840. Since the light intensity can be adjusted through the light modulator 840, there is no need to provide a separate control unit to the light source 800 to adjust the intensity of the output light.

For example, the optical modulator 840 included in the display device according to an embodiment of the present invention includes a micromirror on the upper and lower portions of the optical modulator 840 to adjust the intensity of light output from the light source 800. have. In other words, by adjusting the position of the micromirror to generate a phase difference to cause reinforcement interference or destructive interference it is possible to adjust the light intensity. The configuration of the optical modulator 840 will be described in detail with reference to FIG. 9.

The optical modulator 840 may be a linear one-dimensional optical modulator. In this case, the optical modulator 840 may output linear modulated light. The linear optical modulator 840 is an optical modulator 840 in which the aforementioned micromirrors of the optical modulator 840 are linearly arranged in one dimension for each pixel. When the linearly modulated light output from the one-dimensional linear light modulator 840 reaches the scanner 860, the two-dimensional image may be completed on the external screen even if the scanner 860 is rotated only in the horizontal or vertical direction. Unlike the scanner 220 of FIG. 2, one circular arrow means rotation in one direction.

That is, when the inner screen 870 has a red fluorescent layer, a green fluorescent layer, etc. horizontally arranged from the top to the bottom of the inner screen 870 as described with reference to FIGS. 3 and 5 to 7, the scanner 860 is linear. Irradiate the modulated light from the top to the bottom.

That is, when the scanner 860 irradiates the linearly modulated light to the red fluorescent layer, the red fluorescence corresponding to the group of pixels is simultaneously projected onto the external screen 890 through the external projection lens 880. Then, when the scanner 860 rotates and irradiates linear modulated light on the green fluorescent layer formed at the bottom of the red fluorescent layer, green fluorescence corresponding to the same pixel group as the pixel group on which red fluorescence is projected is emitted. At the same time, it is projected onto the external screen 890 through the external projection lens 880. Therefore, when the scanner 860 irradiates linearly modulated light to the red fluorescent layer, the green fluorescent layer, and the blue fluorescent layer, a series of pixel group images are generated on the external screen 890.

Therefore, when the optical modulator 840 is a linear optical modulator, the scanner 860 does not need to have two-dimensional movement, thereby increasing the mechanical life of the scanner 860 which rotates at high speed and reducing heat generated inside the display device. Can be. The configuration of the linear optical modulator will be described in detail with reference to FIG. 10.

In order for the linear light modulator 840 to output the linear modulated light, the linear light modulator 840 should input linear light or scan the point light to the linear light modulator 840.

That is, the display device according to an embodiment of the present invention, by placing a separate scanner (not shown) that rotates in one dimension in front of the optical modulator 860 to the point light emitted from the light source 800 linear linear modulator 860 Scan and scan multiple micromirrors.

In addition, the display device according to another embodiment of the present invention may further include a linear light generating unit 820 for transforming the point or elliptical light output from the light source 800 into linear light. The linear light generating unit 820 includes a plurality of cylinder lenses, and the point fluorescent light passing through the linear light generating unit 820 is transformed into linear light. That is, a cylindrical lens means a set of one or more lenses having a radius of curvature only in one axial direction. For example, when point fluorescent light passes through a cylindrical or aspherical cylindrical lens such as the inside of a ring, the point fluorescent light spreads in the longitudinal direction. Then, when the light passes through the cylinder lens having the same curvature as the side face of the pencil laid down in the longitudinal direction, it is transformed into linear light in one dimension.

Therefore, when the linear light generator 820 is further included, the display device of the present invention passes the light output from the light source 800 through the linear light generator 820 so that the linear light reaches the linear light modulator 840. Do it.

Therefore, the scanner 860 sequentially irradiates the internal screen with the light modulated and output from the linear light modulator 840. Since the linearly modulated light irradiated to the inner screen by the scanning device is linear in one dimension, the entire screen of the inner screen may be irradiated even though the light is rotated in one dimension.

For example, as described in FIG. 2, scanning from the left side to the right side of the red fluorescent layer does not need to sequentially scan from the left side to the right side of the green fluorescent layer. That is, since the linear modulated light having the same length or longer length from the left end to the right end of the red fluorescent layer can be scanned at a time. In this case, the pixel value of each pixel from the left end to the right end of the red fluorescent layer can be adjusted by independently moving each micromirror of the linear modulator 840 to project the same image as described in FIG. 2 onto an external screen. can do.

Hereinafter, the optical modulator and the linear optical modulator will be described in detail with reference to FIGS. 9 to 10.

9 is a view showing the shape of the micro mirror constituting the optical modulator included in the display device according to another embodiment of the present invention.

Referring to FIG. 9, a diagram illustrating a micromirror of one of a plurality of micromirrors arranged in a line constituting the optical modulator 840 includes a substrate 910, an insulating layer 920, a sacrificial layer 930, A micromirror including a ribbon structure 940 and a piezoelectric body 950 is shown.

The substrate 910 is a commonly used semiconductor substrate, and the insulating layer 920 is deposited as an etch stop layer, and an etchant for etching a material used as a sacrificial layer, where the etchant is an etching gas or an etching Solution). The reflective layer 920 (a) may be formed on the insulating layer 920 to reflect incident light.

The sacrificial layer 930 supports the ribbon structure 940 on both sides of the ribbon structure 940 so as to be spaced apart from the insulating layer 920 at regular intervals, and forms a space at the center.

The ribbon structure 940 serves to light modulate the signal by causing diffraction and interference with respect to the incident light as described above. The shape of the ribbon structure 940 may be configured as a plurality of ribbon shapes as described above, or may be provided with one or more open holes 940 (b) in the center of the ribbon. In addition, the piezoelectric member 950 controls the ribbon structure 940 to move up and down in accordance with the degree of contraction or expansion of up and down or left and right caused by the voltage difference between the upper and lower electrodes. Here, the reflective layer 920 (a) is formed corresponding to the hole 940 (b) formed in the ribbon structure 940.

For example, when the wavelength of light is λ, the distance between the upper reflective layer 940 (a) formed in the ribbon structure 940 and the lower reflective layer 920 (a) formed in the insulating layer 920 is (2L) λ. A first voltage is applied to the piezoelectric body 950 such that / 4 (l is a natural number). In this case, in the case of zero-order diffracted light, the total path difference between the light reflected from the upper reflective layer 940 (a) and the light reflected from the lower reflective layer 920 (a) is equal to λ. Have Here, in the case of + 1st and -1st diffracted light, the brightness of light has a minimum value due to destructive interference.

In addition, the distance between the upper reflective layer 940 (a) formed in the ribbon structure 940 and the lower reflective layer 920 (a) formed in the insulating layer 920 is (2L + 1) λ / 4 (L is a natural number). A second voltage is applied to the piezoelectric body 950. In this case, in the case of zero-order diffracted light, the total path difference between the light reflected from the upper reflecting layer 940 (a) and the light reflected from the lower reflecting layer 920 (a) is equal to (9ℓ + 1) λ / 2, thereby canceling out interference. The modulated light thus has a minimum luminance. In the case of the + 1st and -1st diffracted light, the luminance of light has a maximum value due to constructive interference.

As a result of this interference, the micromirror can adjust the amount of diffracted light to carry a signal for one pixel on the light. In the above, the case where the space | interval between the ribbon structure 940 and the insulating layer 920 is (2L) (lambda) / 4 or (2L + 1) (lambda) / 4 was demonstrated. However, it is obvious that various embodiments of the present invention may be applied to adjust the distance between the ribbon structure 940 and the insulating layer 920 to adjust the luminance of the light interfered by the diffraction and reflection of the incident light.

In addition, in FIG. 9, the diffraction type optical modulator 840 has been described, but it is obvious that the optical modulator included in the display device according to the exemplary embodiment of the present invention may be replaced by a transmissive or reflective type optical modulator. .

In addition, in FIG. 9, the piezoelectric type optical modulator has been described. However, this is only an example of the optical modulator used in the present invention, and it is apparent that the optical modulator may be replaced with an electrostatic type optical modulator.

10 is a view showing an optical modulator included in a display device according to another embodiment of the present invention.

Referring to FIG. 10, the optical modulator 840 includes a first pixel (pixel # 1), a second pixel (pixel # 2),. And m micro mirrors 1000-1, 1000-2,..., 1000-m that are responsible for the m th pixel (pixel #m). The linear light modulator 840 is in charge of image information of a one-dimensional image of a vertical scanning line or a horizontal scanning line (assuming that the vertical scanning line or the horizontal scanning line is composed of m pixels), and each micromirror 1000-1 , 1000-2, ..., 1000-m) are in charge of one pixel of m pixels constituting the vertical scan line or the horizontal scan line.

As illustrated in FIG. 3, the vertical scan line or the horizontal scan line is light modulated while the linear beam is irradiated from the linear light generator 820 in the longitudinal direction in which the micro mirrors are arranged in a line.

Therefore, in the case of the optical modulator 840, the modulated light corresponding to the image information can be outputted correctly only when the size of the linear light emitted from the linear light generator 820 is accurately controlled.

The light reflected and / or diffracted at each micro mirror is then irradiated to the inner screen 870 by the scanner 860. For example, in the case of VGA 720x480 resolution, 1 frame is generated by modulating 720 times on one surface of the scanner 860 for 480 vertical pixels.

In this embodiment, it is assumed that there are two holes 940 (b) -1 formed in the ribbon structure 940. Three upper reflective layers 940 (a) -1 are formed on the ribbon structure 940 due to the two holes 940 (b) -1. In the insulating layer 920, two lower reflective layers are formed corresponding to the two holes 940 (b)-1. In addition, another lower reflective layer is formed on the insulating layer 920 corresponding to the portion of the gap between the first pixel (pixel # 1) and the second pixel (pixel # 2). Accordingly, the number of upper reflective layers 940 (a) -1 and lower reflective layers is equal to three for each pixel, and modulated light (zero-order diffraction light or ± first-order diffraction light) as described above with reference to FIG. It is possible to adjust the brightness of the modulated light using.

11 is a diagram illustrating a configuration of a display apparatus according to another embodiment of the present invention.

Referring to FIG. 11, the polarization rotating unit 865 is different from that of the display device of FIG. 8.

The polarization rotating portion 865 is positioned in the middle of the scanner 860 and the inner screen 870 as described in FIG. 4. However, the position of the polarization rotating unit 865 is not limited thereto, and may be located in any direction in which the light travels until the light is output from the light source 800 and irradiated to the inner screen 870. 11, the polarization rotating part 865 is positioned between the scanner 860 and the inner screen 870.

Light output from one light source 800 is first collimated through the collimating lens 810 and then passes through the linear light generating unit 820. The light passing through the linear light generator 820 is transformed into linear light and enters the optical modulator 840.

However, when the linear light passing through the linear light generator 820 needs to be reduced or enlarged, the linear light may be matched with the size of the optical modulator 840 through the condenser lens 830 or the like before entering the optical modulator 840. have.

In the linear light, the light intensity of each pixel is adjusted by driving each of the micromirrors included in the optical modulator 840 to proceed to the scanner. As shown in FIG. 11, the scanner 860 passes through the internal projection lens 850 to reach the scanner.

The scanner 860 rotates to irradiate the inner screen 870 with linearly modulated light. However, since the irradiated light is linearly modulated light, the entire area of one fluorescent layer is irradiated at one time, so the scanner irradiates linearly modulated light while rotating only in one-dimensional direction.

The fluorescent layers to which linearly modulated light is irradiated at one time are arranged in a band shape for each of the red fluorescent layer, the green fluorescent layer, and the blue fluorescent layer, as described with reference to FIGS. 3 or 5 to 7. In this case, as described above, each filter may be formed or attached to each fluorescent layer to pass polarization having a polarization direction perpendicular to each other to reduce color interference. In addition, in order to increase light efficiency, a fluorescent light filter or an incident light pass filter may be formed or attached to each fluorescent layer.

However, unlike the display device described above with reference to FIG. 4, the scanner 860 applies one formation layer at a time with linearly modulated light, unlike the case where a dot or oval light is sequentially scanned (programmed) onto the inner screen 870. I will investigate. Accordingly, the polarization rotating unit 865 rotates the polarization direction of the linearly modulated light at the instant when the scanner 860 irradiates one fluorescent layer and irradiates the next adjacent fluorescent layer.

For example, the order in which the band-shaped fluorescent layers arranged on the inner screen 870 are arranged is the red fluorescent layer, the green fluorescent layer, the blue fluorescent layer,... From the top of the inner screen 870. It may be assumed that the green fluorescent layer and the blue fluorescent layer. However, this is only an example for explanation of the present invention, it is apparent to those skilled in the art that the arrangement of the fluorescent layer of the inner screen included in the present invention may be different.

In the above example, when the scanner 860 irradiates the uppermost red fluorescent layer, the polarization rotating unit 865 rotates the polarization direction of the irradiated linear modulated light in the vertical direction.

In this case, since a vertical filter is formed on the irradiation surface of the red fluorescent layer to pass the polarized light having a vertical polarization direction, the linear modulated light may pass through the vertical filter to emit red phosphor.

However, since the horizontal filter is formed on the irradiated surface of the green fluorescent layer formed at the bottom of the red fluorescent layer, the horizontally modulated linearly modulated light cannot pass through. Therefore, the green phosphor does not emit light and color interference can be prevented from occurring.

However, when the scanner 860 rotates and irradiates the green fluorescent layer at the bottom of the red fluorescent layer, the polarization rotating unit 865 rotates the polarization direction of the linearly modulated light in the horizontal and horizontal directions. Therefore, the linearly modulated light passes through a vertical filter formed on the irradiated surface of the green fluorescent layer to emit green phosphor. However, since the linearly modulated light polarized in the horizontal direction does not pass through the vertical filter formed on the irradiation surface of the red fluorescent layer, the red phosphor does not emit light.

Therefore, it is also possible to prevent the phenomenon that color interference occurs by emitting red phosphors.

In addition, an irradiation light passing filter and a fluorescent passing filter may be attached to the irradiation surface or the light emitting surface of each formation layer, respectively, as described with reference to FIG. 7. For example, when the light source is a UV lamp, the UV pass filter on the irradiated surface passes UV light but reflects the fluorescence proceeding in the direction of the irradiated surface without causing the phosphor to emit and proceed to the fluorescent surface due to the passed UV light. Proceed to

In addition, the fluorescent filter formed on the fluorescent surface passes only the fluorescence emitted from the phosphor, but reflects the UV light to re-emitting the phosphor. Therefore, the light efficiency is greatly improved due to the filter of the fluorescent surface and the filter of the fluorescent surface.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the invention described in the claims below It will be appreciated that modifications and variations can be made.

1 is a view showing a conventional display device.

2 illustrates a display device according to an embodiment of the present invention.

3 is a view showing the structure of an internal screen included in the display device according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of a display apparatus according to another embodiment of the present invention.

5 is a diagram illustrating a configuration of an internal screen included in a display device according to another embodiment of the present invention.

6 is a view showing in detail the configuration of the internal screen included in the display device according to another embodiment of the present invention.

7 is a view showing the configuration of an internal screen included in a display device according to another embodiment of the present invention.

8 is a view showing a display device according to another embodiment of the present invention.

9 is a view showing the shape of the micro mirror constituting the optical modulator included in the display device according to another embodiment of the present invention.

10 is a view showing an optical modulator included in the display device according to another embodiment of the present invention.

11 is a diagram illustrating a configuration of a display apparatus according to another embodiment of the present invention.

Claims (22)

Light source; A scanner which sequentially scans the path of the light output from the light source; An inner screen on which phosphors for emitting luminescent light are arranged by the sequentially scanned light; And And a projection lens for condensing fluorescence emitted from the phosphor and projecting the fluorescence to an external screen. The method of claim 1 The phosphor is at least one of a red phosphor, a green phosphor, and a blue phosphor emitting red, green, and blue, respectively, And the red phosphor, the green phosphor and the blue phosphor are linearly arranged on the inner screen to form a red phosphor layer, a green phosphor layer and a blue phosphor layer, respectively. The method of claim 1, The display device And a polarization rotating unit configured to rotate the polarization direction of the sequentially scanned light. The method of claim 3, And the polarization rotating part rotates the polarization direction of the sequentially scanned light vertically to correspond to the color of the fluorescent layer. The method of claim 4, wherein And the polarization rotating part vertically rotates the polarization direction of the sequentially scanned light alternately according to the color of the fluorescent layer. The method of claim 1, The light output from the light source is a display device, characterized in that the UV light or blue laser beam. The method of claim 4, wherein The inner screen is An irradiation surface on which the scanner irradiates the light; And It includes a fluorescent surface to which the fluorescence proceeds to emit light by the phosphor is irradiated, And a polarizing filter corresponding to the color of the fluorescent layer is formed or attached to the irradiation surface. The method of claim 7, wherein The polarizing filter is a display device, characterized in that the vertical polarization filter or horizontal polarizing filter is alternately formed or attached to each fluorescent layer. The method of claim 4, wherein The inner screen is An irradiation surface on which the scanner irradiates the light; And It includes a fluorescent surface to which the fluorescence proceeds to emit light by the phosphor is irradiated, And an incident light pass filter configured to attach or pass the irradiated light to the irradiated surface and reflect the fluorescence emitted by the phosphor. The method of claim 9, And a luminescent light pass filter for reflecting the irradiated light and allowing fluorescence emitted by the phosphor to pass through the fluorescent surface. The method of claim 9 or 10, Wherein the irradiated light passing filter or the fluorescent passing filter is formed to correspond to the color of the fluorescent layer. The method of claim 1, The scanner is a display device, characterized in that for changing the path of the light to sequentially scan in two dimensions. The method of claim 1, And the light source modulates and outputs light intensity according to a position where fluorescence is emitted from the inner screen. A light source for outputting light at a constant light intensity; A linear light modulator for modulating optical characteristics of light output from the light source to output linear modulated light; A scanner scanning the linearly modulated light in one dimension by changing a path of the linearly modulated light modulated by the linear light modulator; An inner screen on which phosphors which emit fluorescence by the sequentially scanned light are arranged; And And a projection lens for condensing fluorescence emitted from the phosphor and projecting the fluorescence to an external screen. The method of claim 14, And the phosphors are linearly arranged in a longitudinal direction of linearly modulated light sequentially scanned by the scanner to form a fluorescent layer. The method of claim 15 The phosphor is at least one of a red phosphor, a green phosphor, and a blue phosphor emitting red, green, and blue, respectively, And the red phosphor, the green phosphor, and the blue phosphor form a red phosphor layer, a green phosphor layer, and a blue phosphor layer, respectively. The method of claim 14, The linear optical modulator is a display device, characterized in that the plurality of micro mirrors are arranged in a linear manner to output a linear modulated light to the scanner. The method of claim 14, The light output from the light source is nonlinear light, The display apparatus further includes a linear light generating unit for transforming the non-linear light into linear light, And the optical modulator outputs the linear modulated light by modulating the linear light modified by the linear light generator. The method of claim 14, The display device And a polarization rotating unit for rotating the polarization direction of the linearly modulated light sequentially scanned. The method of claim 19, The inner screen is An irradiation surface to which the scanner irradiates the linearly modulated light; And It includes a fluorescent surface to which the fluorescence proceeds to emit light by the phosphor is irradiated, And a vertical polarization filter or a horizontal polarization filter are alternately formed or attached to the irradiation surface according to the color of the fluorescent layer. The method of claim 16, The inner screen is An irradiation surface on which the scanner irradiates the light; And It includes a fluorescent surface to which the fluorescence proceeds to emit light by the phosphor is irradiated, And an irradiation light passing filter through which the irradiated light passes and reflects the fluorescence emitted by the phosphor. The method of claim 21, And a fluorescence pass filter for reflecting the irradiated light and allowing fluorescence emitted by the phosphor to pass through the fluorescent surface.

Images