KR100861064B1 - Color display apparatus using bi-direction scanning method - Google Patents

Abstract

A light source for irradiating color light according to the light source control signal; An optical modulator device for generating diffracted light by modulating the color light according to an optical modulator control signal; A scanner scanning the diffracted light radiated from the optical modulator element in both directions on a screen according to a scanner control signal to project the diffracted light; And an image control circuit configured to transmit the light source control signal, the optical modulator control signal, and the scanner control signal to the light source system, the optical modulator element, and the scanner, respectively, in response to the image information to be displayed on the screen. A bidirectional scan type color display device. Compared to the three-panel color display device through the one-panel method using one optical modulator element, two panels are reduced, thereby simplifying the optical system and the circuit, thereby significantly reducing the overall material cost.

Color display, optical modulator, bidirectional, scanner

Description

Color display apparatus using bi-direction scanning method}

1 is an embodiment of a conventional three-panel color display device using an optical modulator device employing MEMS devices.

2 is a view showing the configuration of a GLV (Grating Light Valve) device which is an optical modulator of Silicon Light Machine.

3 illustrates the principle of incident light modulation in the GLV device shown in FIG.

4A is a perspective view of one type of diffractive light modulator element using a piezoelectric element among indirect light modulators applicable to a preferred embodiment of the present invention.

4B is a perspective view of another type of diffractive light modulator element using a piezoelectric body applicable to a preferred embodiment of the present invention.

Figure 4c is a plan view of a diffractive light paddyer array applicable to a preferred embodiment of the present invention.

4D is a view for explaining the light modulation principle of the diffractive light modulator applicable to the preferred embodiment of the present invention.

5 is a schematic diagram of an image generated on a screen by a diffractive light modulator array applicable to a preferred embodiment of the present invention.

6 is a schematic configuration diagram of a bidirectional scan type color display apparatus having one panel according to an exemplary embodiment of the present invention.

7 illustrates a configuration of a frame projected on a screen according to the present invention.

8 is a view showing a color image display method according to an embodiment of the present invention.

9 is a view continuously showing a color image display method according to a preferred embodiment of the present invention.

10 is a view showing examples of a light source control signal, an optical modulator control signal, and a scanner control signal transmitted from an image control circuit according to a preferred embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

610: light source system

620: Illumination Optical System

630: optical modulator element

640: relay optical system

650: Scanner

660: projection optical system

670: screen

680: image control circuit

The present invention relates to a color display device, and more particularly, to a color display device for outputting a one-dimensional image signal from one optical modulator element to a screen by using a scanner to output a two-dimensional image.

Recently, with the development of display technology, the demand for the implementation of large images is increasing day by day. Currently, most large image display devices (mainly projectors) use liquid crystals as optical switches. Compared to the CRT projectors of the past, it is used because it is small, inexpensive, and the optical system is simple. However, it is pointed out that a large amount of light loss occurs because light from the light source is transmitted through the liquid crystal plate to the screen. Therefore, a brighter image can be obtained by reducing light loss by utilizing a micromachine such as an optical modulator element using reflection.

Micromachines are extremely small machines that are difficult to discern with the naked eye. Also known as MEMS (Micro Electro Mechanical System), it can be called microelectromechanical system or device. It is mainly made by applying semiconductor manufacturing technology. It is applied to various information equipment parts such as magnetic and optical heads using micro-optics and limit devices, and it is also applied to biomedical field and semiconductor manufacturing process using various micro fluid control technologies. Micromachines can be divided into micro-sensors that function as sensing elements, micro-actuators as driving devices, and miniature machines that serve as energy transfer devices.

MEMS is applied to the optical field as one of various application fields. MEMS technology enables the fabrication of optical components smaller than 1mm, enabling ultra-compact optical systems.

Micro-optical components such as optical modulator elements and micro lenses, which are miniature optical systems, have been adopted and applied to communication devices, displays, and recording devices due to advantages such as fast response speed, small loss, and ease of integration and digitization.

1 shows an embodiment of a conventional three-panel color display device using an optical modulator device employing MEMS devices.

The conventional three-panel color display device includes a light source system 110, an illumination optical system 120, three panels 130, a color synthesis system 150, a projection system 160, and a screen 170.

The light source system 110 includes a plurality of laser light sources including a red light source 112, a green light source 114, and a blue light source 116, which are three primary colors of light. Each color light in the light source system 110 is incident on each panel 130 through the beam forming lenses 120a and 120b of the illumination optical system 120.

Each of the three panels 130 includes optical modulator elements 132, 134, and 136, and each of the light modulators 132, 134, and 136 is responsible for one color light. Each incident color light (red light, green light, blue light) is modulated by the light intensity and projected onto the color combining system 150.

The color synthesizing filter 152 of the color synthesizing system 150 synthesizes red light, green light, and blue light in which light intensities are modulated, and extracts only signal components by the spatial filter 154.

The projection system 160 is deployed in space by a scanner 162 (galvano mirror in this example) that synchronizes with the image signal, and is projected as a color image on the screen 170 by the projection lens 164.

The conventional three-panel color display apparatus described above has to have three optical modulator elements corresponding to laser light sources of respective colors, and thus there is a problem in that an optical system is complicated and manufacturing cost increases. In addition, since the laser light sources of each color should all have the same output, there is a problem in that the image quality of the color image projected when one laser light source is weak in output is poor.

Accordingly, in order to solve the above problems, an object of the present invention is to simplify the optical system and the circuit by reducing two panels as compared with the three panel type color display device through the one panel method using one optical modulator element. It is to provide a one-panel color display device having a significant savings in material costs.

Another object of the present invention is to provide a two-panel color display device in which the scanning frequency of the scanner is 1/2 of the bi-directional scanning method, compared to the unidirectional scanning method, so that the production specification is simple and the life of the scanner can be extended. will be.

Other objects of the present invention will be readily understood through the following description.

In order to achieve the above object, according to an aspect of the present invention, a light source for irradiating color light (color light) according to the light source control signal; An optical modulator device for generating diffracted light by modulating the color light according to an optical modulator control signal; A scanner scanning the diffracted light radiated from the optical modulator element in both directions on a screen according to a scanner control signal to project the diffracted light; And an image control circuit configured to transmit the light source control signal, the optical modulator control signal, and the scanner control signal to the light source system, the optical modulator element, and the scanner, respectively, in response to the image information to be displayed on the screen. A bidirectional scan type color display apparatus may be provided.

Preferably, the diffracted light represents one vertical line image, which is a one-dimensional image of the screen, and may be implemented as a two-dimensional image by bidirectional scanning in the horizontal direction in the scanner.

Alternatively, the diffracted light represents one horizontal line image, which is a one-dimensional image of the screen, and may be implemented as a two-dimensional image by bidirectional scanning in the vertical direction in the scanner.

Preferably, the light source includes a red light source, a green light source, and a blue light source, and the red light source, the green light source, and the blue light source are turned on and off according to the light source control signal. (on-off) can be controlled. Here, when any one of the red light source, the green light source, and the blue light source is on, the remaining light sources are off.

Further, the image information is red, green, and blue light intensity information of pixels equal to (vertical line pixels) x (horizontal line pixels) constituting one frame, and the image control circuit is controlled by the light source control signal. The light intensity information corresponding to the color of the light source in the on state may be transmitted to the optical modulator device in synchronization with the optical modulator control signal.

In addition, the scanner may project diffracted light corresponding to any one of red, green, and blue colors corresponding to one frame every 1/2 rotation to the screen, and the scanner may turn red, Each diffracted light corresponding to green and blue may be projected once onto the screen.

Here, the scanner may rotate one second within 1 / (1.5 × field frequency according to the television broadcasting system) seconds.

The scanner may also include a galvano mirror.

The following merely illustrates the principles of the invention. Therefore, those skilled in the art, although not explicitly described or shown herein, can embody the principles of the present invention and invent various methods and apparatus using the same that are included in the concept and scope of the present invention. In addition, it is to be understood that all detailed descriptions, including the principles, aspects, and embodiments of the present invention, as well as listing specific embodiments, are intended to include structural and functional equivalents.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for sequentially distinguishing identical or similar entities.

Hereinafter, the optical modulator applied to the present invention will be described first before describing the preferred embodiments of the present invention in detail.

Optical modulators are largely divided into a direct method of directly controlling the on / off of light and an indirect method using reflection and diffraction, and the indirect method may be divided into an electrostatic method and a piezoelectric method. Herein, the optical modulator is applicable to the present invention regardless of the manner in which the optical modulator is driven.

FIG. 2 is a diagram illustrating the configuration of a GLV (Grating Light Valve) device manufactured by Silicon Light Machine, which is a type of diffractive light modulator device using an electrostatic method, among the indirect light modulators applicable to the present invention. FIG. 2 is a view illustrating a principle of incident light modulation in the GLV device shown in FIG. 2.

Referring to FIG. 2, the GLV device 200 has a bridge shape between an insulating substrate 210 such as a glass substrate, a common substrate side electrode 220 formed on the insulating substrate 210, and a substrate side electrode 220. And a plurality of beams 230a to 230f (hereinafter abbreviated to 230) which are arranged in parallel and arranged in parallel.

The plurality of beams 230 are formed of a bridge member 240 and a driving side electrode 250 which serves as a reflection film made of an aluminum (Al) film provided on the bridge member 240. Is formed.

According to the potential applied to the substrate side electrode 220 and the driving side electrode 250, the beam 230 is displaced by electrostatic attraction or electrostatic repulsion between the substrate side electrode 220. As shown by solid and dashed lines in FIG. 2B, the beam 230 is displaced in parallel or concave with respect to the substrate-side electrode 220.

The displacement of the plurality of beams 230 in the parallel state or the concave state is alternately changed. When no voltage is applied to the plurality of beams 230, all are maintained in parallel as shown in FIG. 3A, and when a small voltage is applied to the odd-numbered beams 230a, 230c, 230e. As shown in FIG. 3B, the odd-numbered beams 230a, 230c, and 230e remain concave, and the even-numbered beams 230b, 230d, 230f remain parallel. In this case, the diffraction (interference) is caused by a path difference between the first reflected light reflected by the incident beams 230a, 230c, and 230e and the second reflected light reflected by the even-numbered beams 230b, 230d, and 230f. Occurs and the intensity of the light is modulated. By using this, the gray scale of the screen pixel, that is, the light intensity is expressed. It is assumed that the plurality of beams 230 (six beams in this example) represent the light intensity of one pixel, and the plurality of beams 230 are one micro mirror.

4A is a perspective view of one type of diffractive light modulator element using a piezoelectric element among indirect light modulators applicable to a preferred embodiment of the present invention, and FIG. 4B is another type of diffraction using a piezoelectric element applicable to a preferred embodiment of the present invention. A perspective view of a fluorescent modulator element. 4A and 4B, an optical modulator including a substrate 51, an insulating layer 52, a sacrificial layer 53, a ribbon structure 54, and a piezoelectric body 55 is shown.

The substrate 51 is a commonly used semiconductor substrate, and the insulating layer 52 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 layers 52 (a) and 52 (b) may be formed on the insulating layer 52 to reflect incident light.

The sacrificial layer 53 supports the ribbon structure 54 at both sides such that the ribbon structure 54 is spaced apart from the insulating layer 52 at regular intervals, and forms a space at the center.

The ribbon structure 54 serves to light modulate the signal by causing diffraction and interference of incident light as described above. The shape of the ribbon structure 54 may be configured in a plurality of ribbon shapes according to the electrostatic method as described above, or may be provided with a plurality of open holes in the center of the ribbon according to the piezoelectric method. In addition, the piezoelectric member 55 controls the ribbon structure 54 to move up and down according to 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 layers 52 (a) and 52 (b) are formed corresponding to the holes 54 (b) and 54 (d) formed in the ribbon structure 54.

Hereinafter, the optical modulator of the type shown in FIG. 4A will be described.

Referring to FIG. 4C, the optical modulator includes a first pixel (pixel # 1), a second pixel (pixel # 2),. And m micromirrors 50-1, 50-2,..., 50-m that are responsible for the m-th pixel (pixel #m). The optical modulator is responsible for image information on the one-dimensional image of the vertical scanning line or the horizontal scanning line (where the vertical scanning line or the horizontal scanning line is composed of m pixels), and each micromirror 50-1, 50-2. , ..., 50-m) are in charge of any one of m pixels constituting the vertical scan line or the horizontal scan line. Thus, the reflected and diffracted light in each micro mirror is then projected on the screen as a two dimensional image by the light scanning device. For example, in the case of VGA 640 * 480 resolution, 640 modulations are performed on one side of an optical scanning device (not shown) for 480 vertical pixels, thereby generating one frame of one screen per side of the optical scanning device.

Hereinafter, the principle of light modulation will be described based on the first pixel (pixel # 1), but the same may be applied to other pixels.

In this embodiment, it is assumed that there are two holes 54 (b) -1 formed in the ribbon structure 54. Due to the two holes 54 (b)-1, three upper reflective layers 54 (a)-1 are formed on the ribbon structure 54. Two lower reflective layers are formed in the insulating layer 52 corresponding to the two holes 54 (b) -1. In addition, another lower reflective layer is formed on the insulating layer 52 corresponding to a portion of the gap between the first pixel (pixel # 1) and the second pixel (pixel # 2). Accordingly, the number of upper reflective layers 54 (a) -1 and lower reflective layers per pixel is the same, and the luminance of modulated light is obtained by using zero-order diffraction light or ± first-order diffraction light as described above with reference to FIG. 4A. It is possible to adjust.

4D, there is shown a diagram for explaining the light modulation principle of the diffractive light modulator. It demonstrates centering on sectional drawing of the BB 'line | wire of FIG. 4C.

For example, when the wavelength of light is λ, an insulating layer having upper reflective layers 54 (a) and 54 (c) and lower reflective layers 52 (a and 52 (b)) formed on the ribbon structure 54 ( A first voltage is applied to the piezoelectric member 55 so that the interval between the two portions 52 is 2n lambda / 4 (n is a natural number) (see Fig. 4D (a)). In this case, in the case of zero-order diffracted light (reflected light), the total path difference between the light reflected from the upper reflective layers 54 (a) and 54 (c) formed on the ribbon structure 54 and the light reflected from the insulating layer 52 is As nλ, constructive interference causes diffracted light to have maximum luminance. Here, in the case of + 1st and -1st diffraction light, the brightness of light has a minimum value due to destructive interference.

In addition, the interval between the upper reflective layers 54 (a) and 54 (c) formed on the ribbon structure 54 and the insulating layer 52 on which the lower reflective layers 52 (a) and 52 (b) are formed is (2n + 1). A second voltage is applied to the piezoelectric member 55 so that λ / 4 (n is a natural number) (see (b) of FIG. 4D). In this case, in the case of zero-order diffracted light (reflected light), the total path difference between the upper reflective layers 54 (a) and 54 (c) formed on the ribbon structure 54 and the light reflected from the insulating layer 52 is (2n + 1). ) is equal to lambda / 2, and there is a destructive interference, so the diffracted light has the 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 light modulator can adjust the amount of reflected or diffracted light to carry the signal on the light. In the above, when the distance between the ribbon structure 54 and the insulating layer 52 in which the lower reflective layers 52 (a) and 52 (b) were formed is (2n) λ / 4 or (2n + 1) λ / 4 Although described, it will be apparent that various embodiments which can be driven with intervals for controlling the intensity of interference caused by diffraction and reflection of incident light can be applied to the present invention.

5 is a schematic diagram of an image generated on a screen by a diffractive light modulator array applicable to a preferred embodiment of the present invention.

Light reflected and diffracted by the m micromirrors 50-1, 50-2,..., 50-m arranged vertically is reflected by the optical scanning device, and is generated by horizontally scanning the screen 100. 500-1, 500-2, 500-3, 500-4, ..., 500- (k-3), 500- (k-2), 500- (k-1), 500-k) are shown. When rotated once in the optical scanning device, one image frame may be projected. Here, the scanning direction is shown in a left to right direction (arrow direction), but it is obvious that the image can be scanned in the reverse direction.

In the present invention, the optical modulator device generates diffracted light having various signal sizes with respect to a constant incident light by a GLV device, a MEMS structure, or an interference principle, and is a device capable of loading a signal into light. The device in charge of the image pixels is collectively referred to.

6 is a schematic configuration diagram of a bidirectional scan type color display apparatus having one panel according to an exemplary embodiment of the present invention. In the present invention, the color display device generally means a projection device. 7 is a view showing the configuration of a frame projected on the screen according to the present invention, Figure 8 is a view showing a color image display method according to an embodiment of the present invention.

Referring to FIG. 6, the bidirectional scan type color display apparatus having one panel includes a light source system 610, an illumination optical system 620, one panel (ie, one optical modulator element 630), and a relay optical system 640. , A scanner 650, a projection optical system 660, a screen 670, and an image control circuit 680. Here, since the illumination optical system 620, the relay optical system 640, the projection optical system 660 is a general component in the projection apparatus, a detailed description thereof will be omitted.

The light source system 610 includes a red light source 612, a green light source 614, and a blue light source 616 that irradiate three primary colors of light, red light, green light, and blue light, respectively. The red light source 612, the green light source 614, and the blue light source 616 are preferably laser light sources or laser diodes.

Each color light in the light source system 610 is incident on one panel (ie, the light modulator element 630) through the illumination optical system 620.

The light modulator element 630 receives color light from one of the red light source 612, the green light source 614, and the blue light source 616. It is preferable not to receive two or more color lights at the same time, and to receive only color light for one color at a time.

As described above, the optical modulator element 630 generates diffracted light by modulating the incident light according to the light intensity information for one line when it is later projected onto the screen 670. Here, one line is a horizontal line of any one of pixels equal to (the number of horizontal pixels (ie, horizontal line pixels)) × (the number of vertical pixels (ie, vertical line pixels)) constituting one frame. Or vertical lines. Hereinafter, the optical modulator element 630 will be described as being mainly responsible for any one vertical line, but this is not a limitation of the scope of the present invention.

In the optical modulator device 630, the GLV device 200 illustrated in FIG. 2 or the MEMS structure illustrated in FIG. 4 may be disposed in parallel by the number of pixels of the line to cover one vertical line. One vertical line is a one-dimensional image, and the screen 670 represents a two-dimensional image. The one-dimensional image is represented as a two-dimensional image by the scanner 650 to be described later.

The optical modulator device 630 receives color light that does not include image information, and according to the color modulator control signal received from the image control circuit 680 to be described later, image information about the corresponding color light and the corresponding line (that is, light intensity). Information) on the color light. This process is modulation of color light. That is, the optical modulator element 630 plays a role of a panel representing image information. Through this, the colored light carrying the image information, that is, the diffracted light, is transmitted to the scanner 650 through the relay optical system 640.

The scanner 650 spreads the diffracted light in space according to the scanner control signal received by the image control circuit 680. The projection optical system 660 includes a projection lens, and projects the diffracted light developed in the space by the scanner 650 on the screen 670 as a color image.

As described above, the diffracted light developed in the space by the scanner 650 is a one-dimensional image signal indicating one vertical line of any frame of the screen to be expressed, which is modulated by the optical modulator element 630.

The diffracted light is projected onto a vertical line at a predetermined position corresponding to an image signal in the screen 670 by bidirectional rotation in the horizontal direction of the scanner 650. When the image signal of each vertical line is projected in the horizontal direction due to the rotation of the scanner 650, one frame is completed and one screen is completed to be seen as one screen to the human eye.

In the present invention, the scanner 650 may be rotated in both directions, and may be a device capable of two-dimensionally displaying a 1D image, and a galvano mirror may be included in the scanner 650.

The image control circuit 680 has image information of a frame forming one screen. The image information means light intensity information of red, green, and blue of a pixel by (number of vertical line pixels) x (number of horizontal line pixels). For example, if the number of vertical line pixels is m (natural number) and the number of horizontal line pixels is n (natural number), one frame is composed of the first to nth vertical lines or the first to mth horizontal lines. (See FIG. 7).

The image control circuit 680 extracts light intensity information regarding red, green, or blue in a predetermined order. For example, the order may be red, green, and blue, and the order may be changed.

Referring to FIG. 7, when the scan by the scanner 650 is performed in the horizontal direction, the direction from the first vertical line to the nth vertical line is referred to as a forward, and the direction from the nth vertical line to the first vertical line is referred to as forward. The direction is called backward.

Alternatively, when the scan is performed by the scanner 650 in the vertical direction, the direction from the first horizontal line to the mth horizontal line is called forward, and the direction from the mth horizontal line to the first horizontal line is backward. It is called).

Referring to FIG. 8, the scan by the scanner 650 is performed in the horizontal direction, and the modulation by the optical modulator element 630 is performed by each vertical line. In addition to this example, the scan by the scanner 650 is made in the vertical direction, and the modulation by the optical modulator element 630 may be performed for each horizontal line.

Referring to FIG. 8A, first, when light intensity information regarding red is extracted, only the red light source 612 is turned on, and the green light source 614 and the blue light source 616 are turned off. The light source control signal to be in a state is transmitted to the light source system 610. Then, the red light intensity information on the nth vertical line, that is, the optical modulator control signal is transmitted to the optical modulator element 630.

When the diffracted light modulated according to the optical modulator control signal is transmitted to the scanner 650 in the optical modulator element 630, the diffracted light is positioned at a position corresponding to the nth vertical line on the screen 670. It transmits a scanner control signal to adjust its position by rotating it so that it can be expressed. Thereafter, the optical modulator device 630 and the scanner 650 transmit the optical modulator control signal and the scanner control signal corresponding to each vertical line from the (n-1) th vertical line to the first vertical line. Here, the scanner control signal may be a speed control signal for causing the scanner 650 to rotate in one direction (clockwise in this example) at a predetermined speed, or may be a position control signal for moving to a predetermined position at a specific time.

Referring to FIG. 8B, when the projection is completed on the screen 670 in the reverse direction from the nth vertical line to the first vertical line with respect to red, light intensity information about green is extracted. Then project in relation to green in a similar manner as projected on screen 670 in relation to red. In this case, however, since the scanner 650 can scan in both directions, in the case of green, projection is not performed in the reverse direction from the nth vertical line to the first vertical line, but in the forward direction from the first vertical line to the nth vertical line. The projection is made. Therefore, when extracting the light intensity information on green, the optical modulator control signal corresponding to the light intensity information on the first vertical line must first be transmitted to the light modulator element 630. The scanner control signal transmitted to the scanner 650 is also a speed control signal for rotating the scanner 650 in the other direction (counterclockwise in this example) at a predetermined speed as opposed to the red color, or at a predetermined position. It may be a position control signal to move.

Referring to FIG. 8C, when the projection is completed on the screen 670 in the forward direction from the first vertical line to the nth vertical line with respect to green as described above, finally, light intensity information regarding blue is extracted. do. Then for blue it is projected in the same way as it was projected on screen 670 with respect to red.

Referring to FIG. 8 (d), the projection of red, green, and blue is completed, so that a full color image may be completed on one screen, and the time taken up to 1 / (television broadcasting method) is completed. Per field frequency).

The field frequency according to the television broadcasting method means a minimum frequency at which a human cannot visually detect a break in the moving picture screen. As a color display apparatus, a television broadcasting method includes an NTSC (national television system committee) method, a PAL (phase alteration by line) method, and the like.

The NTSC method converts the three primary color signals of red, green, and blue into one luminance signal (Y) and two color difference signals (I, Q), and then multiplexes and transmits them in a frequency bandwidth of 6 MHz. The PAL method complements the color transmission method, which is a disadvantage of the NTSC method.

The NTSC system consists of 4205 scan lines and 60 Hz field frequency, and the PAL method consists of 625 scan lines and 50 Hz field frequency.

That is, if three primary colors of red, green, and blue are projected on one screen within 1 / (field frequency (for example, 60Hz for NTSC, 50Hz for PAL)) depending on the field frequency, the human eye is simultaneously red, It is assumed that a screen in which a full color image including both green and blue is represented is formed. Therefore, when red, green, and blue are projected once each within 1 / (field frequency), one visually recognizes that red, green, and blue are simultaneously projected.

To this end, the scanner 650 may allow red, green, and blue to be projected once in three-second rotation of a bi-directional scan. That is, it is preferable that the time when the scanner 650 rotates 3/2 is within 1 / (field frequency), and therefore, the scanner 650 preferably has the scan frequency in both directions being 1.5 times the field frequency.

9 is a view continuously showing a color image display method according to a preferred embodiment of the present invention.

Referring to FIG. 9, only the red light source 612 is turned on with respect to the clockwise rotation of the scanner 650 in step 1, and the image of the k (random natural number) frame is included in the optical modulator element 630. Of the information, only red information is modulated and projected on the screen 670 in the reverse direction.

In the second step, only the green light source 614 is turned on with respect to the counterclockwise rotation of the scanner 650. In the optical modulator element 630, only the green information is modulated from the image information of the k-th frame to display the screen ( 670 is projected forward.

In step 3, only the blue light source 616 is turned on with respect to the clockwise rotation of the scanner 650, and only the blue information of the image information of the k-th frame is modulated by the optical modulator element 630, thereby screen 670 In the reverse direction.

As the first to third steps are completed, the full color image corresponding to the kth frame is completed, and the time required for the first to third steps is within 1/60 second when the NTSC method is used. When done in 1/50 seconds.

In step 4, only the red light source 612 is turned on with respect to the counterclockwise rotation of the scanner 650, and the optical modulator element 630 has only red information among the image information of the (k + 1) th frame. This is modulated and projected forward on screen 670.

In operation 5, only the green light source 614 is turned on with respect to the clockwise rotation of the scanner 650, and only the green information is modulated among the image information of the (k + 1) th frame in the optical modulator element 630. And projected in reverse on the screen 670.

In step 6, only the blue light source 616 is turned on with respect to the counterclockwise rotation of the scanner 650, and only the blue information of the image information of the (k + 1) th frame is included in the optical modulator element 630. It is modulated and projected forward on screen 670.

As the steps 4 through 6 are completed, the full color image corresponding to the (k + 1) th frame is completed, and the time required for the steps 4 through 6 is within 1/60 second based on the NTSC method. It should be done within 1/50 second of the way.

Thereafter, steps 1 to 6 are repeated to (k + 2), (k + 3),... The full color image corresponding to the first frame may be continuously displayed.

Of course, in the present invention, it is possible to use other orders other than the order of red, green, and blue.

FIG. 10 is a diagram illustrating an example of a light source control signal, an optical modulator control signal, and a scanner control signal transmitted from the image control circuit 680 according to a preferred embodiment of the present invention. In FIG. 10, red, green, and blue are selected as one example, but other orders may be used. In the present embodiment, the field frequency of 60 Hz is based on the NTSC scheme, and one frame has an interval of 1/60 second (sec).

Referring to FIG. 10, the optical modulator control signal is transmitted from the image control circuit 680 to the optical modulator element 630 while including image information, that is, light intensity information, in the order of red, green, and blue.

Only red light source 612 when red image information is transmitted, only green light source 614 when green image information is transmitted, and only blue light source 616 when blue image information is transmitted. The light source control signal is transmitted from the image control circuit 680 to the light source system 610.

The scanner 650 is projected once on the screen 670 for each image information. The scanner 650 scans in the reverse direction when rotated clockwise, and scans in the forward direction when rotated counterclockwise. Of course, the opposite can be true.

The scanner 650 rotates clockwise and counterclockwise to complete one rotation. Therefore, by 3/2 rotation, red, green, and blue can be projected once each, thereby completing a full color image. The time that the scanner 650 rotates once is 1/90 second, and the scan frequency is 90 Hz.

As described above, in the color display device according to the present invention, the optical system and the circuit are simplified due to the reduction of two panels in comparison with the three-panel color display device through the one-panel method using one optical modulator element. There is a significant savings in

In addition, the scan frequency of the scanner is half of that of the bidirectional scanning method than that of the unidirectional scanning method, thereby simplifying the manufacturing specification and extending the life of the scanner.

Although the above has been described 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 present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

Claims (11)

And a red light source, a green light source, and a blue light source, and the red light source, the green light source, and the blue light source are turned on one by one according to a light source control signal. a light source for sequentially irradiating color light); An optical modulator element of one panel for generating diffracted light by modulating the color light emitted from the light source system according to an optical modulator control signal; A scanner scanning the diffracted light output from the optical modulator element in both directions on a screen according to a scanner control signal to project the diffracted light; And And an image control circuit which transmits and controls the light source control signal, the optical modulator control signal, and the scanner control signal to the light source system, the optical modulator element, and the scanner, respectively, in response to the image information to be displayed on the screen. Scanning color display device. The method of claim 1, And the diffracted light represents one vertical line image which is a one-dimensional image of the screen, and is implemented as a two-dimensional image by a bidirectional scan in a horizontal direction in the scanner. The method of claim 1, And the diffracted light represents one horizontal line image which is a one-dimensional image of the screen, and is implemented as a two-dimensional image by bidirectional scanning in the vertical direction in the scanner. delete delete The method of claim 1, And the image information is red, green, and blue light intensity information of pixels equal to (vertical line pixels) x (horizontal line pixels) constituting one frame. The method of claim 6, The image control circuit is a bidirectional scan type color display which transmits the light intensity information corresponding to the color of the light source turned on by the light source control signal to the optical modulator element in synchronization with the optical modulator control signal. Device. The method of claim 1, And the scanner projects diffracted light corresponding to one of red, green, and blue colors corresponding to one frame every 1/2 rotation on the screen. The method of claim 8, And the scanner projects each diffracted light corresponding to red, green, and blue once on the screen by 3/2 rotation. The method of claim 8, And the scanner rotates in one rotation within 1 / (1.5 × television broadcasting method) seconds. The method of claim 1, And the scanner comprises a galvano mirror.

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