KR20070032270A - Display device - Google Patents

Abstract

In the present invention, a concept of improving resolution using human visual characteristics is applied. In other words, the present invention can be seen with a much higher resolution image quality than the actual physical resolution, it is possible to obtain the same effect as the physical resolution is improved.

To this end, the present invention divides an image signal corresponding to one frame into a first image signal and a second image signal, and forms a first image and a second image, respectively, so that the display is displayed at the first position and the second position of the screen. To be recognized as improved.

Description

Display device {DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device to which a resolution enhancing device capable of effectively improving resolution in a projection display device is applied.

Recently, display apparatuses are becoming lighter, thinner, and larger screens, and large display apparatuses have become an important issue in the display field.

In particular, projection type video display devices are required to express higher resolution as digital broadcasting becomes full-fledged.

Disclosure of the Invention

An object of the present invention is to provide a display device that can effectively improve the resolution by a simple configuration and operation.

In particular, it is an object of the present invention to provide a display device including a resolution enhancing device capable of more precise control.

According to an aspect of the present invention, a display apparatus includes a light source, image forming means for forming an image using light emitted from the light source and an input image signal, projection means for projecting an image formed by the image forming means on a screen; And displacement means for moving the image displayed on the screen to be displaced, driving means for driving the displacement means, and sensing means for sensing an movement of the displacement means to control an input signal applied to the driving means. It is characterized by.

According to an aspect of the present invention, a display apparatus includes a light source, image forming means for forming an image using light emitted from the light source and an input image signal, projection means for projecting an image formed by the image forming means on a screen; An optical path changing means for changing the optical path, a driving means for driving the optical path changing means, and a counter electromotive force generated according to the driving of the optical path changing means. And sensing means for sensing and controlling an input signal applied to the driving means.

According to an exemplary embodiment of the present invention, a display apparatus includes a lamp in which light is emitted, signal processing means for separating a video signal corresponding to a frame into a plurality of video signals, a plurality of video signals input from the signal processing means, and the lamp. Image forming means for sequentially forming an image using the light generated by the light source; projection means for projecting the image formed by the image forming means on a screen; and positioned on an optical path between the image forming means and the screen. Light transmitting means periodically moving so that the image displayed on the screen is displaced to a plurality of positions by refraction, driving means for driving the light emitting means, and sensing the movement of the light emitting means to control an input signal applied to the driving means. Characterized in that it comprises a sensing means to be included.

1 is a view illustrating a display apparatus and a method to which a resolution enhancing apparatus of the present invention is applied.

Figure 2 is another embodiment illustrating a display device and method to which the resolution improving device of the present invention is applied.

3 is a view for explaining the operation of the displacement plate in the display device and method to which the resolution improving device of the present invention is applied.

4 is a view for explaining the principle of operation of the displacement plate as the image displacement means in the display device and method to which the resolution improving device of the present invention is applied.

5 and 6 are views for explaining the displacement of light formed on the screen according to the movement of the displacement plate in the display device and method to which the resolution improving apparatus of the present invention is applied.

7 is a view illustrating a first image and a second image in the display device to which the resolution improving apparatus of the present invention is applied.

8 is a perspective view of a resolution improving device in the present invention.

Figure 9 is an exploded perspective view of the resolution improving device in the present invention.

10 is a rear exploded perspective view of the movable member.

11 is an exploded perspective view of the fixing member.

12 is a view for explaining that the coil holder is formed in the resolution improving device in the present invention.

13 is a view showing an embodiment in the case of winding the sensor coil on the sensor coil holder.

14 is a view showing an embodiment in the case of forming a coil and a sensor coil on a PCB substrate.

Best Mode of Invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, a display device to which a resolution enhancing device is applied is disclosed.

In general, resolution refers to how many pixels are used to express an image. In other words, resolution is used as a measure of precision in representing an image.

Conventionally, in the display apparatus, a physical method of increasing the number of pixels has been used to improve the resolution, but in the present invention, a method of improving the resolution using human visual characteristics is used.

In other words, the present invention can be seen with a much higher resolution image quality than the actual physical resolution, it is possible to obtain the same effect as the physical resolution is improved.

As will be described in more detail below, the present invention divides an image signal corresponding to one frame into a first image signal and a second image signal, and forms a first image and a second image, respectively, to form a first position and a second position of the screen. It can be displayed on the screen so that the resolution can be recognized as if the resolution is improved according to the human visual characteristics.

For example, the first position and the second position may be one pixel or less or more, and may be spaced apart in a vertical direction, a horizontal direction, and a diagonal direction.

In particular, in the present invention, the optical path changing means for causing the position where the first image and the second image are displayed to be displaced to the first position and the second position is used.

As the optical path changing means, a light transmitting body is used, and the light path is changed as the position or angle of the light transmitting body is changed.

1 is a view illustrating a display apparatus and a method to which a resolution enhancing apparatus of the present invention is applied.

FIG. 1 is an illumination system of a projection TV using a reflective LCD. In the reflection type illumination system of the 3 PBS system of FIG. 1, the light irradiated from a lamp 1 is passed through a condensing lens to form a first dike. Passing through the dichroic mirror 2, red (R), green (G) light is reflected and blue (B) light is transmitted.

The reflected red and green light passes through the second dichroic mirror 3 while the green light is reflected, and the red light is transmitted through the second, second, 3 incident to the first, second, and third polarized beam splitter (PBS) 4a, 4b, 4c in front of the panel of LCD (5a) (5b) (5c).

Light of each of R, G, and B incident on the first, second, and third PBSs 4a, 4b, and 4c is reflected to the first, second, and third LCD panels 5a, 5b, and 5c. Incident and incident light of each of R, G, and B is phase-shifted and reflected by the first, second, and third LCD panels 5a, 5b, and 5c, respectively, so that the first, second, and third PBSs 4a It penetrates (4b) (4c).

An image is formed on the first, second and third LCD panels 5a, 5b and 5c according to an image signal input from a signal processing means (not shown).

The images of R, G, and B transmitted through the first, second, and third LCD panels 5a, 5b, 5c, and 1,2,3 PBSs, 4a, 4b, and 4c are X-prism 6 ) And is incident on the projection lens 10 through the displacement plate 11.

The image passing through the projection lens 10 is projected onto the screen 12.

In this case, the displacement plate 11 may be located between the X-prism 6 and the projection lens 10, and may be located between the projection lens 10 and the screen 12.

The displacement plate 11 is a thin plate-like transmissive body through which light can pass, and thus the position or angle of the displacement plate 11 can be implemented to have higher resolution.

In addition, although the optical system using a reflective LCD, a dichroic mirror, a PBS, etc. is illustrated in the embodiment of FIG. 1, a transmissive LCD may be used instead of the reflective LCD, and the reflective LCD is a liquid crystal on silicon (LCoS). ) Can be used.

In addition, the example illustrated in FIG. 1 is a three-plate type using three LCD panels, but the present invention is applicable to a single-plate type using one LCD panel, and the structure of the optical system may be variously changed.

In addition, the present invention can be applied not only to a projection TV but also to a projector.

That is, the illustrated example is only one embodiment to which the spirit of the present invention may be applied, and does not limit the scope of the present invention.

2 is another embodiment illustrating a display apparatus and a method to which a resolution enhancing apparatus of the present invention is applied.

2 refers to FIG. 2 as a DLP optical system to which the present invention is applied.

The optical system provides light to be illuminated on the DMD 14, and depending on the image signal, each micromirror will illuminate the screen in the on state or the off state. It is determined whether the light will shine on this side.

The DLP optical system includes a lamp 17 through which light is generated, a rod lens 18 through which light generated by the lamp 17 passes, and white light passing through the rod lens 18 is R, G, and B. The color wheel 19 divided into the color wheel, the condensing lens 13 to collect the light passing through the color wheel 19, and the prism 15 to reflect the light passing through the condensing lens 13 are reflected. ), A DMD 14 for illuminating the light reflected by the prism 15 on the screen, a displacement plate 11 for causing the light reflected by the DMD 14 to be displaced according to a change in time, and A projection lens 16 for enlarging and projecting the light passing through the displacement plate 11 onto the screen 12 is included.

Referring to the operation of the DLP optical system based on the above configuration, the white light emitted from the lamp 17 is focused by the internal curvature of the reflector, and the focused light is a light tunnel or a rod lens. (18).

The bar lens 18 is bonded to four small elongated mirrors facing each other, and the light passing through the bar lens 18 is diffusely reflected so that the brightness distribution is uniform.

The uniformity of the brightness of the light is the same as the uniformity of the light finally shining on the screen, and the bar lens 18 which functions as such becomes an important optical component in the projection display.

Light passing through the rod lens 18 passes through the color wheel 19 for color division, and the color wheel 19 is rotated in accordance with the vertical synchronization of the image.

Light passing through the color wheel 19 passes through the condensing lens 13 and is reflected by the prism 15 to the DMD 14.

The prism 15 may be totally reflected or transmitted according to the incident angle of light.

Light shining on the DMDM 14 is directed toward or off the screen depending on the on / off state of the micromirror controlled in accordance with the sampled pixel value.

The DM 14 is changed to an on / off state according to an image signal input from a signal processing means (not shown), and thus a predetermined image is formed.

The image reflected by the DM14 toward the screen 12 is enlarged to be projected through the displacement plate 11 and the projection lens 16 to be reflected on the large screen 12.

In this case, the displacement plate 11 may be located between the prism 15 and the projection lens 16 or between the screen 12 and the projection lens 16.

Alternatively, it may be located between the DM14 and the prism 15.

The displacement plate 11 periodically changes its position or changes the angle so that the projected light is formed at another position of the screen 12.

According to the embodiment described with reference to FIGS. 1 and 2, the displacement plate 11 may be located at a selected point between the screen and the image forming means for forming an image by combining R, G, and B. FIG.

Meanwhile, in FIG. 1 and FIG. 2, in the image forming unit, an image signal corresponding to one frame is divided into a first image signal and a second image signal from the signal processing unit, respectively, and is formed by combining R, G, and B. It is formed of one image and a second image.

Specifically, in FIG. 1, the image forming means includes the first, second, and third LCD panels 5a, 5b, 5c, the first, second, and third PBSs 4a, 4b, 4c, and X-prism 6; ) May be included.

In addition, in FIG. 2, the image forming unit may include a color wheel 19, a condensing lens 13, and a DMM 14.

That is, in the present invention, a video signal corresponding to one frame is divided into a plurality of video signals, synthesized into a plurality of images, and displayed.

In the present invention, the time when one image is displayed is a time obtained by dividing the time when the image of one frame is displayed by the number of images.

However, in a preferred embodiment of the present invention, a video signal corresponding to one frame is divided into a first video signal and a second video signal, synthesized into a first video and a second video, and sequentially to the first position and the second position on the screen. The display is displayed as if the resolution is recognized as being improved.

3 is a view for explaining the operation of the displacement plate in the resolution improving device of the present invention.

In FIG. 3, (a) is a state where the displacement plate 11 is not present or the movement of the displacement plate 11 is absent, and the image emitted from the prism or the projection lens is displayed at the same position on the screen.

On the other hand (b) is a case in which the displacement plate 11 is rotated in the counterclockwise direction, (c) is a case in which the displacement plate 11 is rotated in the clockwise direction.

Initially, if the displacement plate 11 in the (a) state is changed to the state of (b) or (c), the image is deflected while passing through the displacement plate 11 to form another position on the screen.

That is, in the present invention, the displacement plate 11 operates as an optical path changing means, so that when the image is projected, the image is displayed at another position of the screen according to the movement of the displacement plate 11.

In other words, in the present invention, the displacement plate 11 allows the position of the image displayed on the screen to be displaced by the image displacement means.

4 is a view for explaining the principle of operation of the displacement plate as the image displacement means in the display device and method to which the resolution improving apparatus of the present invention is applied.

According to the thickness of the displacement plate 11, the inclination angle of the displacement plate 11 (incident angle of light), and the refractive index of the displacement plate 11, the degree of movement of light on the screen 12 may be calculated. 12, the thickness, inclination angle and refractive index of the displacement plate 11 may be selected according to the degree of light movement required.

This can be derived by Snell's law of equation (1).

[Equation 1]

( n ₁ is the refractive index of air, n ₂ is the refractive index of the displacement plate, θ ₁ is the angle of incidence of light, θ ₂ is the angle of refraction of light)

Therefore, the path difference D of the light passing through the displacement plate 11 may be expressed by the following Equation 2.

[Equation 2]

In addition, the path difference D of the light passing through the displacement plate 11 is determined by the displacement of the light formed on the actual screen 12 according to the magnification of the projection lens.

It is preferable that the refractive index of the said displacement plate 11 is chosen in the range of 1.4-2.0.

The present invention uses a light transmitting body to generate a path difference (D) of light, and uses the refraction of light.

Meanwhile, according to another embodiment of the present invention, a reflective mirror may be used to change the path of light.

That is, the reflection mirror is positioned on the optical path and the reflection path of the light is changed to change the path of the reflected light according to the angle of the reflection mirror.

Changing the light path using reflection requires precise control because the path of light changes sensitively as the angle of the reflection mirror changes compared to changing the light path using refraction.

In the present invention, the degree of displacement of the image may be a range smaller than the size of the pixel or more. However, since the degree of displacement of the image is not large, the optical path changing means must be operated precisely so that the image projected from the projection lens is displaced within a small range.

Therefore, the optical path changing means using the light transmitting body is advantageous in that the control is easy and the probability of error occurrence is much reduced.

In particular, as shown in FIG. 4, the light incident on the same point of the light transmitting body generates only a path difference D, and does not change the direction of light travel.

In the case of using the reflection mirror, even the light incident on the same point of the reflection mirror requires a more precise control since the direction of light changes according to the angle of the reflection mirror.

5 and 6 are views illustrating a displacement of light formed on a screen according to the movement of the displacement plate 11 in the display device and method to which the resolution improving apparatus according to the present invention is applied.

FIG. 5 is a view showing that the displacement plate 11 periodically moves in the display device having the rectangular pixel structure, and thus the image on the screen 12 moves.

(a) is a conventional pixel structure showing the same image at the same position for a predetermined time (T = 0 to T1), but (b) and (c) are at time (T = 0) and time (T = T1). By showing different images in different positions at), it is possible to recognize twice the resolution with the same number of pixels.

For example, an image signal constituting one frame is divided into a first image signal and a second image signal, and the images of the first image signal and the second image signal are respectively synthesized during the time when the image of one frame is displayed. To be displayed sequentially.

Specifically, in the conventional case, it is assumed that the same image information is displayed for 1/60 second. In the present invention, the image information is divided into the first image information and the second image information, and the first position and the second position are respectively displayed for 1/120. Display in position respectively.

FIG. 7 illustrates a first image and a second image in which an image corresponding to one frame is divided into two.

An image corresponding to one frame may be divided into a first image illustrated in FIG. 7A and a second image illustrated in FIG. 7B, and the first image and the second image illustrated in FIG. 7. Can be separated according to the position of the pixel.

Meanwhile, the position at which the first image (Odd data) and the second image (Even data) are displayed is displaced by the displacement plate 11.

In FIG. 5B, the display position of the first image (Odd data) and the display position of the second image (Even data) are displaced in a diagonal direction. In FIG. 5C, the first image ( The display position of the Odd data) and the display position of the second image (Even data) are displaced in the horizontal direction.

In FIG. 6, the position of an image formed on a screen in a display device having a rhombus-shaped pixel structure is illustrated with time.

6 (a) shows a conventional image of the same image at the same position for a predetermined time (T = 0 to T1), but (b) shows a time (T = T1) and a time (T = 0). By showing different images at different positions in the X, it is possible to recognize twice the resolution with the same number of pixels.

8 is a perspective view of a resolution improving apparatus according to the present invention, Figure 9 is an exploded perspective view of the resolution improving apparatus according to the present invention.

10 is a rear exploded perspective view of the movable member, and FIG. 11 is an exploded perspective view of the fixing member.

8 to 11, the resolution improving apparatus according to the present invention includes a fixing member 20 and a movable member 30.

First, the fixing member 20 has a fixing portion 21 formed on one side so that the fixing member 20 can be fixed on the optical path between the image forming means and the screen. Although the drawing shows that the hole is formed to enable the screw coupling, the method of being fixed in the display device can be variously modified.

That is, the fixing member 20 allows the resolution enhancing device to be firmly fixed on the optical path.

In addition, a magnet 23 and a yoke 22 are formed at one side of the fixing member 20. Preferably, the magnet 23 and the yoke 22 may be formed on both sides of the fixing member 20, as shown, may be selectively formed on either side.

Here, the magnet 23 may be a two-pole magnet in which the N pole and the S pole are formed, and may be a one-pole magnet in which the N pole or the S pole is selectively formed. In addition, a multipole magnet in which a plurality of N poles and S poles are formed is also possible.

The magnet 23 allows the movable member 30 to be driven using a magnetic field, and the yoke 22 increases the efficiency of the magnetic field by forming a magnetic path (path of the magnetic field).

On the other hand, the movable member 30 is rotatably coupled to the inside of the fixing member 20.

The movable member 30 is formed in a rectangular or rhombus shape and has a structure surrounding a light path. The movable member 30 is formed in a structure suitable for fixing the displacement plate 31.

As described above, the displacement plate 31 is a light-transmitting light transmitting body that rotates a predetermined angle for a short time and changes the position of the image on the screen.

To this end, the displacement plate 31 may be perpendicular to the optical path or have an inclination of a predetermined angle. Therefore, the incident angle of the light incident on the displacement plate 31 is periodically changed.

The movable member 30 is formed on both sides of the shaft 32 is rotatably coupled to the shaft insertion groove 27 of the fixing member 20, preferably the first and second bearings 33 for smooth rotation 36 is further included. Here, the shaft 32 serves as a rotation center axis of the movable member 30 or the displacement plate 31, and the rotation center axis is formed in a direction orthogonal to the optical path.

The first bearing 33 has a cylindrical shape and a shaft 32 is inserted in the center thereof, and the first bearing 33 is positioned in the shaft insertion groove 27 of the fixing member 20.

The second bearing 36 has a large outer diameter at the side of the movable member 30 and is formed to be caught by the inner surface of the fixing member 20.

That is, the movable member 30 is fixed so as not to be moved in the left direction by the second bearing 36 in the inserted state in the fixing member 20, the plate on the right side of the first bearing 33 The spring 24 is formed and fixed so that it cannot be moved to the right side.

However, by the elasticity of the leaf spring 24 to ensure that the proper movement is fixed so that the rotation of the movable member 30 is made smoothly.

The leaf spring 24 supports the movable member 30 in a state in which the other end coupled to the fixing member 20 at only one end is not fixed.

On the other hand, the first cover 25 and the second cover 26 is formed on the upper side of the first and second bearings 33 and 36 to support the movable member 30 so as not to escape upward.

The first cover 25 is coupled to the movable member 30 with two screws, and the second cover 26 is only partially coupled to the movable member 30 with one screw. The reason for this configuration is to ensure proper movement so that the movable member 30 can be rotated smoothly.

That is, the second cover 26 has a moderate elastic force, which can be seen as similar to the operation of the leaf spring (24).

In other words, it serves as an elastic means to be fixed to the fixing member 20 while ensuring proper movement of the movable member 30.

On the other hand, the coil 35 is formed on the side surface of the movable member 30, that is, the surface facing the magnet 23 formed on the fixing member 20.

In order to facilitate the installation of the coil 35, a coil holder 38 is provided on the side surface of the movable member 30, as shown in FIG. 12, and the coil 35 is supported by the coil holder 38. Is fixed. The coil 35 is formed in a substantially rectangular shape or a race track shape so that the movable member 30 can move about the magnet 23 according to the direction of current.

That is, the coil 35 is supplied with power from the power supply line 34, and attraction and repulsive force are generated by interaction with the magnet 23 formed in the fixing member 20 as current flows in the coil 35. The movable member 30 is driven. That is, the movable member 30 is rotated clockwise or counterclockwise with respect to the central axis of rotation in accordance with the current applied to the coil 35.

Although not shown, as another embodiment, a magnet may be formed on a side of the movable member, and a coil holder and a coil supported by the coil holder may be formed on a side of the fixing member facing the magnet.

As shown in FIG. 10, the displacement plate 31 is coupled to the movable member 30, and after the displacement plate 31 is positioned on the protrusion 39 formed inside the movable member 30, the support member 37 is formed. ) To fix it. The shape of the protrusion 39 is shown in detail in FIG. 9.

The displacement plate 31 may be injected together with the movable member 30 to be fixed to the movable member 30 without a separate support member 37.

And, as shown in Figure 11 in order to limit the angle of rotation of the movable member 30, a stopper 28 is formed inside the fixing member 20 is movable member (by external impact or malfunction or excessive operation) The rotation range of 30) is limited to a certain angle or less.

The resolution improving apparatus according to the present invention configured as described above is located on the optical path of the display device, and rotates by the interaction of the coil 35 and the magnet 23 according to the application of the control current.

On the other hand, the sensing means is included in the present invention for more precise control of the movable member (30). In particular, the sensing means uses a counter electromotive force generated in the coil.

In the present invention, the counter electromotive force generated by the coil is sensed to control power or an input waveform supplied to the movable member 30.

This allows the movable member 30 to be operated more precisely.

In the case of FIG. 13, the sensor coil 41 is wound around the sensor coil holder 42. In FIG. 14, the coil 35 and the sensor coil 41 are wound on the PCB substrate 43. Is a view showing an embodiment in the case of forming a.

At least one sensor coil 41 is formed at a side surface of the coil 35, and a counter current is induced in the sensor coil 41 as a control current flows into the coil 35 to drive the movable member 30. do.

Accordingly, by analyzing the counter electromotive force, it is possible to know a state in which the movable member 30 is driven, and to control the control current applied to the coil 35 according to the counter electromotive force induced by the sensor coil 41.

For example, when the counter electromotive force induced in the sensor coil 41 is lower than the reference value, by increasing the control current applied to the coil 35, it is possible to smoothly drive the movable member 30.

In a modified embodiment, the sensor coil 41 and the coil 35 may be formed on the fixing member 20 and the magnet 23 may be formed on the movable member 30. .

The in-order enhancement device according to the present invention configured as described above is positioned on the optical path of the display device, and rotates by the interaction of the coil 35 and the magnet 23 according to the application of the control current.

The range of rotation of the movable member 30 may be preferably set within a range of ± 0.75 degrees and rotated so as to be periodically positioned at the first position and the second position.

The movable member 30 is rotated at least once during the time that the video signal of one frame is applied.

Therefore, the resolution visually felt can be improved significantly.

According to the present invention, it is possible to periodically display different images on the screen and to visually recognize them, so that the number of pixels can be felt as a large number, thereby showing an improved resolution with the same number of pixels.

In addition, the present invention can provide a display device having a higher resolution by providing a resolution improving device that operates more accurately.

Accordingly, the present invention enables the resolution to be effectively improved at a low cost in a large display device.

The present invention can be applied to a projection display device.

Claims (21)

Light source, Image forming means for forming an image using light emitted from the light source and an input image signal; Projection means for projecting an image formed by the image forming means on a screen; Displacement means for moving the image displayed on the screen to be displaced; Drive means for driving the displacement means; And a sensing means for sensing a movement of the displacement means to control an input signal applied to the driving means. The method of claim 1, The displacement means includes a movable member to which the displacement plate is fixed, and a fixing member to which the movable member is rotatably coupled. The method of claim 2, The driving means includes a coil formed on the movable member, and a magnet formed on a fixing member facing the coil. The method of claim 3, And the coil is fixed by a coil holder. The method of claim 3, And the coil is formed on the PCB substrate. The method of claim 2, And the sensing means is a sensor coil formed on the movable member. The method of claim 6, And the sensor coil is fixed to the sensor coil holder. The method of claim 6, And the sensor coil is formed on a PCB substrate. The method of claim 2, The driving means includes a coil formed on the fixing member and a magnet formed on the movable member facing the coil. The method of claim 9, And the coil is fixed by a coil holder. The method of claim 9, And the coil is formed on the PCB substrate. The method of claim 9, The sensing device is a display device, characterized in that the sensor coil formed in the fixing member. The method of claim 12, And the sensor coil is fixed to the sensor coil holder. The method of claim 12, And the sensor coil is formed on a PCB substrate. Light source, Image forming means for forming an image using light emitted from the light source and an input image signal; Projection means for projecting an image formed by the image forming means on a screen; An optical path changing means for changing an optical path, the optical path being formed on the optical path on which the image is formed and projected; Driving means for driving the optical path changing means; And a sensing means for sensing the counter electromotive force generated by the driving of the optical path changing means to control an input signal applied to the driving means. The method of claim 15, The displacing means includes a movable member having a displacement plate fixed thereto and a fixing member rotatably coupled to the movable member. The method of claim 16, And the sensing means is a sensor coil formed on the movable member. The method of claim 17, The sensor coil is fixed to the sensor coil holder formed on the movable member. The method of claim 17, And the sensor coil is formed on a PCB substrate. Lamps that emit light, Signal processing means for separating one video signal corresponding to one frame into a plurality of video signals; Image forming means for sequentially forming an image by using the plurality of image signals input from the signal processing means and the light generated by the lamp; Projection means for projecting an image formed by the image forming means on a screen; Light transmission means positioned on an optical path between the image forming means and the screen and periodically moving so that an image displayed on the screen is displaced to a plurality of positions by refraction; Driving means for driving the light transmitting means; And sensing means for sensing a movement of the light transmitting means to control an input signal applied to the driving means. The method of claim 20, And the light transmitting means is a light transmitting plate having a central axis and rotating within a range of a predetermined angle.

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