KR100782004B1 - Color display apparatus and recording medium for controlling color images - Google Patents

Abstract

A color display apparatus and a color image control recording medium are disclosed. According to an embodiment of the present invention, N light sources for irradiating different color light (color light) according to the light source control signal for controlling on and off; A one-dimensional optical modulator device for generating diffracted light by modulating the color light emitted from the light source according to the optical modulator control signal; A scanner that scans and projects diffracted light emitted from the one-dimensional optical modulator element on a screen according to a scanner control signal; And a light source control signal for receiving an image signal, turning on each of the N light sources once, and turning on one light source having a relatively weakest output among the N light sources, and a light source in the turned on state extracted from the video signal. A color including an optical modulator control signal, which is information of light intensity, and an image control circuit which transmits and controls a scanner control signal for controlling the rotation of the scanner according to the optical modulator control signal to a light source, a one-dimensional optical modulator element, and a scanner, respectively According to the present invention, a combination that can produce the maximum output from a commercial light source is selected by scanning once more for a light source having a weak output while using a commercially available commercial light source as it is. It is effective to realize a brighter image.

Color display, 1 panel, optical modulator, 4 scans.

Description

Color display apparatus and recording medium for controlling color images}

1 is a schematic configuration diagram of a color display device using a one-dimensional optical modulator device according to an embodiment of the present invention.

Fig. 2 is a diagram showing the configuration of a Grating (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 method applicable to a preferred embodiment of the present invention.

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

5A is a plan view of a diffractive light modulator array applicable to a preferred embodiment of the present invention.

5B is a view for explaining the light modulation principle of the diffractive light modulator applicable to the preferred embodiment of the present invention.

6 is a diagram showing the configuration of one frame projected on a screen according to the present invention;

7 is a view showing a method for displaying a color image of any one frame when using a galvano scanner as an embodiment of the present invention.

8 is a view showing a method of displaying a color image of a continuous frame in the present invention when the scanner is the galvano scanner of FIG.

9 is a view showing a method of displaying a color image of consecutive frames when using a polygon mirror scanner as another preferred embodiment of the present invention.

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

FIG. 11 is a table comparing the degree of brightness enhancement during four scans with three scans in accordance with one preferred embodiment of the present invention. FIG.

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

110: light source system 120: illumination optical system

130: 1-dimensional optical modulator element 140: relay optical system

150: scanner 150a: galvano scanner

150b: polygon mirror scanner 160: projection optical system

170: screen 180: 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 with the CRT projectors of the past, it is small and inexpensive, and the optical system is simple and used. 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 limiting devices, and it is also applied to biomedical field and semiconductor manufacturing process using various micro fluid control technologies. Micromachines can be divided into microsensors, which act as sensing elements, micro actuators as driving devices, and miniature machines that transfer other energy.

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 the implementation of very small 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.

In a three-panel or one-panel color display device (eg, a projection device) using a one-dimensional optical modulator device employing MEMS devices, three primary colors of light, red, green, and blue, are used to display a color image. .

In this case, the light source for irradiating red, green, and blue light is limited to commercial light sources that can be obtained at the time of manufacturing the color display device. Therefore, in many cases, the ratio of the color power output required for expressing a specific color image is different from that of the commercially available light source.

For this reason, there is a problem in that the image of the desired brightness cannot be realized due to the limitation of commercial light sources in displaying color images.

Accordingly, in order to solve the above problems, the present invention provides a color display apparatus and a color image control recording medium capable of realizing a color image having maximum brightness by utilizing a commercially available commercial light source.

In addition, a color display device and color capable of realizing a brighter color image by selecting a combination that can produce the maximum output from a commercial light source by scanning once more for a light source having a relatively weak output while using a commercial light source Provided is an image control recording medium.

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

According to an aspect of the present invention, N light sources for irradiating different color light (color light) according to the light source control signal for controlling the on and off; A one-dimensional optical modulator device for generating diffracted light by modulating the color light emitted from the light source according to the optical modulator control signal; A scanner that scans and projects diffracted light emitted from the one-dimensional optical modulator element on a screen according to a scanner control signal; And a light source control signal for receiving an image signal, turning on each of the N light sources once, and turning on one light source having a relatively weakest output among the N light sources, and a light source in the turned on state extracted from the video signal. A color including an optical modulator control signal, which is information of light intensity, and an image control circuit which transmits and controls a scanner control signal for controlling the rotation of the scanner according to the optical modulator control signal to a light source, a one-dimensional optical modulator element, and a scanner, respectively A display device may be provided.

Here, the N light sources may be three color light sources of red, green, and blue which are three primary colors of light.

In addition, the scanner of the present invention is a galvano scanner, and the galvano scanner scans in both directions in one rotation, and scans the diffracted light corresponding to any one of N light sources every 1/2 rotation of the galvano scanner. The (N + 1) / 2 rotation of the galvano scanner allows a full color image of one frame to be projected on the screen. At this time, the (N + 1) / 2 rotation of the galvano scanner may be performed within 1 / (field frequency according to the television broadcasting method) seconds.

In addition, the scanner of the present invention is a polygon mirror scanner having a polygonal pillar shape, the polygon mirror scanner performs a unidirectional scan, one of the N light sources every 1 / (number of sides of the polygonal column) rotation of the polygon mirror scanner A full color image of one frame can be projected on the screen by scanning the diffracted light corresponding to the light source and rotating (N + 1) / (number of sides of the polygonal pillar) of the polygon mirror scanner. At this time, the rotation of the (N + 1) / (number of sides of the polygonal pillar) of the polygon mirror scanner may be made within 1 / (field frequency according to the television broadcasting method) seconds.

According to another aspect of the invention, a program of image control instructions that can be executed in a color display device including a light source, a one-dimensional optical modulator element and a scanner is tangibly embodied, and can be read by the color display device. A recording medium, comprising: (a) turning on any one of N light sources for irradiating different color light; (b) transferring light intensity information corresponding to the color light of the turned on light source to the one-dimensional optical modulator element; (c) controlling the scanner so that the diffracted light generated by being modulated by the one-dimensional optical modulator element according to the light intensity information is scanned and projected on the screen; And (d) repeating steps (a) to (c) until the relatively light source of N light sources is turned on twice, and the remaining light sources are turned on one time. A recording medium on which a program is recorded can be provided.

Here, steps (a) to (c) may be performed within 1 / {(field frequency according to the television broadcasting method) × (N + 1)} seconds.

According to another aspect of the present invention, a program of image control instructions that can be executed in a color display apparatus including a light source, a one-dimensional optical modulator element, and a scanner is tangibly embodied and can be read by the color display apparatus. A recording medium, comprising: (a) turning on any one of N light sources for irradiating different color light; (b) transferring light intensity information corresponding to the color light of the turned on light source to the one-dimensional optical modulator element; (c) controlling the scanner so that the diffracted light generated by being modulated by the one-dimensional optical modulator element according to the light intensity information is scanned and projected on the screen; And (d) repeating step (c) successively in the turn-on state, the light source having the weakest light output among N light sources, repeating steps (a) to (c) until the other light sources are turned on one by one. A recording medium on which a program for executing image control including a step is recorded can be provided.

Here, steps (a) to (c) may be performed within 1 / {(field frequency according to the television broadcasting method) × (N + 1)} seconds.

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 with reference to FIGS. 2 to 5 before describing 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 view showing the configuration of a grating light valve (GLV) device manufactured by Silicon Light Machine Co., Ltd., which is a type of diffractive light modulator device using an electrostatic method applicable to the present invention, and FIG. 3 is shown in FIG. Illustrating the principle of incident light modulation in a conventional GLV device.

Referring to FIG. 2, the GLV device 30 has a bridge shape between an insulating substrate 31 such as a glass substrate, a common substrate side electrode 32 formed on the insulating substrate 31, and a substrate side electrode 32. A plurality of beams 33a to 33f (hereinafter abbreviated as 33) arranged in parallel and arranged in parallel.

The plurality of beams 33 is a so-called bridge type in which a bridge member 34 and a driving side electrode 35 which serves as a reflection film made of an aluminum (Al) film provided on the bridge member 34 are supported. Is formed.

According to the potential applied to the substrate side electrode 32 and the driving side electrode 35, the beam 33 is displaced by electrostatic attraction or electrostatic repulsion between the substrate side electrode 32. As shown by solid and dashed lines in FIG. 2B, the beam 33 is displaced in parallel or concave with respect to the substrate-side electrode 32.

The displacement of the plurality of beams 33 in the parallel or concave state is alternately changed. When no voltage is applied to the plurality of beams 33 as shown in (a) of FIG. 3, all of them are kept in parallel while a small voltage is applied to the odd-numbered beams 33a, 33c, and 33e. As shown in FIG. 3B, the odd-numbered beams 33a, 33c, and 33e remain concave, and the even-numbered beams 33b, 33d, 33f remain parallel.

In this case, diffraction (interference) is caused by the path difference between the first reflected light reflected by the incident beams 33a, 33c, 33e and the second reflected light reflected by the even-numbered beams 33b, 33d, 33f. This 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 33 (six beams in this example) express the light intensity of one pixel, and the plurality of beams 33 are one micro mirror.

4A is a perspective view of one type of diffractive light modulator device using a piezoelectric method applicable to a preferred embodiment of the present invention, and FIG. 4B is another type of diffraction type light using a piezoelectric method applicable to a preferred embodiment of the present invention. A perspective view of a 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.

5A is a plan view of a diffractive light modulator array applicable to a preferred embodiment of the present invention, and FIG. 5B is a view for explaining a light modulation principle of the diffractive light modulator applicable to a preferred embodiment of the present invention. Hereinafter, the optical modulator of the type shown in FIG. 4A will be described.

Referring to FIG. 5A, 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 the optical scanning apparatus for 480 vertical pixels, thereby generating one frame of one screen per side of the optical scanning apparatus.

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.

5B, there is shown a diagram for explaining the light modulation principle of the diffractive light modulator. It demonstrates centering on sectional drawing of the line BB 'of FIG. 5A.

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 such that the interval between the two portions 52 is 2n lambda / 4 (n is a natural number) (see (a) of FIG. 5B). 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). is applied to the piezoelectric body 55 (see (b) of FIG. 5B). 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, the case where the space | interval 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) (lambda) / 4 or (2n + 1) (lambda) / 4 Although described, it is obvious that various embodiments that can be driven with intervals that can adjust the intensity interfered by the diffraction and reflection of incident light can be applied to the present invention.

1 is a schematic configuration diagram of a color display apparatus using a 1D optical modulator device according to an exemplary embodiment of the present invention.

In the present invention, a color display device generally means a projection device. In addition, in the present invention, the one-dimensional light modulator device generates diffracted light having various intensities with respect to a constant incident light by the GLV device 30, the MEMS structure or the interference principle, and is a device capable of loading various signals on light. As described above, the device in charge of the one-dimensional image pixel is collectively referred to.

1 and 6 to 11 illustrate the method of scanning four times using three light sources, but this does not limit the scope of the present invention, and any N for irradiating different color light is provided. It will be readily understood that a color display device and a method of displaying a color image of the method of scanning (N + 1) times using N light sources (where N is a natural number of 3 or more) can also be derived from the following detailed description.

Referring to FIG. 1, a color display apparatus using a one-dimensional optical modulator device includes a light source system 110, an illumination optical system 120, a panel (that is, one one-dimensional optical modulator device 130), and a relay optical system ( 140, a scanner 150, a projection optical system 160, a screen 170, and an image control circuit 180. Here, since the illumination optical system 120, the relay optical system 140, and the projection optical system 160 are common components in the projection apparatus, detailed description thereof will be omitted.

The light source system 110 includes a red light source 112, a green light source 114, and a blue light source 116 that emit red, green, and blue light, which are three primary colors of light, respectively. Although the light source system 110 is preferably a light source corresponding to three primary colors of light, this does not limit the scope of the present invention, and various combinations of light sources having different colors may be possible. The light source system 110 is preferably a laser light source.

Each color light in the light source system 110 is reflected by the illumination optical system 120 at a predetermined angle and is incident on the one-dimensional light modulator element 130.

The one-dimensional light modulator element 130 receives color light from any one of the red light source 112, the green light source 114, and the blue light source 116. 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 one-dimensional light modulator device 130 generates diffracted light by modulating the incident light according to the light intensity information of one scan line when projected onto the screen 170. Here, one scanning line means any one of the horizontal scanning lines or the vertical scanning lines among (the number of pixels of the vertical scanning line) x (the number of pixels of the horizontal scanning line) constituting one frame of the color image. Hereinafter, the one-dimensional optical modulator device 130 will be described as being mainly responsible for any one vertical scan line, but this is not a limitation of the scope of the present invention.

In the one-dimensional optical modulator device 130, the GLV device 200 shown in FIG. 2 or the MEMS structure shown in FIG. 4 may be disposed in parallel by the number of pixels constituting the vertical scan line to cover one vertical scan line. . One vertical scanning line is a one-dimensional image, and the screen 170 represents a two-dimensional image, and thus, the one-dimensional image is scanned by the scanner 150 to be described later.

The one-dimensional optical modulator 130 receives color light that does not include image information, and according to the optical modulator control signal received from the image control circuit 180 to be described later, image information about the corresponding color light and the corresponding vertical scan line (that is, Light intensity information) is loaded on the color light. This process is modulation of color light. That is, the one-dimensional optical modulator element 130 is in charge of the panel representing the image information. Through this, the color light carrying the image information, that is, the diffracted light, is transmitted to the scanner 150 via the relay optical system 140.

The scanner 150 spreads the diffracted light in space according to the scanner control signal received from the image control circuit 180. The projection optical system 160 includes a projection lens, and projects the diffracted light developed in the space by the scanner 150 on the screen 170 as a color image.

As described above, the diffracted light developed in the space by the scanner 150 is a one-dimensional image signal which displays a vertical scanning line of any one frame of a screen to be expressed, which is modulated by the one-dimensional optical modulator element 130.

By rotating the scanner 150 in the horizontal direction, the diffracted light is projected onto the vertical scanning line at a predetermined position corresponding to the image signal in the screen 170. When all the image signals of each vertical scanning line are projected in the horizontal direction due to the rotation of the scanner 150, one frame is completed and one screen is completed to be seen as one screen to the human eye. The scanner 150 performing this function may be a galvanometer scanner or a polygon mirror scanner.

Although the scan by the scanner 150 is made in the horizontal direction, and the modulation by the 1D optical modulator element 130 is performed for each vertical scan line, the scan is performed in the vertical direction. Modulation by the one-dimensional optical modulator element 130 may be performed for each horizontal scan line, of course.

The image control circuit 180 receives an image signal, and the image signal includes image information of a frame forming one screen. The image information includes red, green, and blue light intensity information of the pixel by (number of pixels of the vertical scanning line) x (number of pixels of the horizontal scanning line). For example, if the number of pixels of the vertical scanning line is m (natural number) and the number of pixels of the horizontal scanning line is n (natural number), one frame is composed of n first to nth vertical scanning lines or m first to mth horizontal lines. It can be said that it consists of a scanning line (refer FIG. 6).

The image control circuit 180 extracts light intensity information regarding red, green, or blue in a predetermined order from the image information. In this case, the image control circuit 180 once receives the light intensity information regarding color light corresponding to any one of the red light source 112, the green light source 114, and the blue light source 116 constituting the light source system 110. Will extract more. Alternatively, red, green, and blue light intensity information is stored in a buffer memory (not shown), and can be extracted from the buffer memory in a predetermined order.

 The color light from which the light intensity information is extracted once more is preferably the color light of a light source having a light power relatively weaker than the other two light sources of the light source system 110. For example, when the red light source among the three light sources has a weaker output than the other two light sources, the light intensity information may be extracted in the order of red → green → blue → red. Here, the above order is only an example, and if the light intensity information for color light corresponding to a light source having a weak output is extracted once more, a combination of various orders may be possible.

6 is a diagram showing the configuration of one frame projected onto a screen according to the present invention.

Referring to FIG. 6, when the scan is performed by the scanner 150 in the horizontal direction, a direction from the first vertical scan line to the nth vertical scan line is referred to as a forward, and from the nth vertical scan line to the first vertical scan line The direction of is called backward. In the following description, it is assumed that the scanner 150 in the horizontal direction is scanned in the forward direction when the rotation in the horizontal direction is counterclockwise, and in the reverse direction when the clockwise direction is different. Of course, the opposite can be true.

Alternatively, when the scan is performed by the scanner 150 in the vertical direction, a direction from the first horizontal scan line to the m th horizontal scan line is called forward, and a direction from the m horizontal scan line to the first horizontal scan line is reversed. It is called).

FIG. 7 illustrates a method of displaying a color image of any one frame when the galvano scanner 150a is used as an exemplary embodiment of the present invention.

7, the light source control signal, the optical modulator control signal, and the scanner control signal from the image control circuit 180 are scanned in order of red, green, blue and colors corresponding to a light source having a weak output which will be described later. It is assumed that the light source 110 is transmitted to the one-dimensional optical modulator element 130 and the scanner 150. In addition, it is assumed that the light source having the weak output at this time is the red light source 112. Of course, the scanning order is only one example, and may be performed by other order than the above order. In addition, the light source having a weak output may also be any light source that is determined according to a method described later in the light source system 110.

In addition, the color image display method according to the present invention to be described below is a recording medium (e.g. For example, it may be implemented as a hard disk, a CD-ROM, etc.).

Referring to FIG. 7A (hereinafter, referred to as a first scan), when the light intensity information regarding red is first extracted, the image control circuit 180 may turn on only the red light source 112. The green light source 114 and the blue light source 116 transmit a light source control signal to the light source system 110 to be turned off. The image control circuit 180 transmits the optical modulator control signal including the red light intensity information of the nth vertical scan line to the one-dimensional optical modulator element 130.

In addition, when the diffracted light modulated according to the optical modulator control signal is transmitted from the one-dimensional optical modulator element 130 to the galvano scanner 150a, the image control circuit 180 causes the galvano scanner 150a to display the screen 170. The scanner control signal is transmitted to the galvano scanner 150a so as to adjust the position by rotating the diffracted light so that the diffraction light can be expressed at the position corresponding to the nth vertical scan line. Here, the scanner control signal may be a speed control signal for causing the galvano scanner 150a 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.

Thereafter, the image control circuit 180 similarly corresponds to each vertical scan line in the one-dimensional optical modulator element 130 and the galvano scanner 150a from the (n-1) th vertical scan line to the first vertical scan line. Passes the optical modulator control signal and the scanner control signal.

Referring to FIG. 7B (hereinafter referred to as a second scan), when the projection is completed on the screen 170 in the reverse direction from the nth vertical scan line to the first vertical scan line with respect to red as described above, green is completed. Extract light intensity information for. And projects green relative to screen 170 in a similar manner as projected on screen 170 with respect to red.

In this case, the galvano scanner 150a may scan in both directions, and rotate in a counterclockwise direction during the second scan. For this reason, in the case of green, projection is performed in the forward direction from the first vertical scan line to the nth vertical scan line, unlike in the first scan of FIG. Therefore, when extracting light intensity information on green, an optical modulator control signal corresponding to the light intensity information on the first vertical scan line must first be transmitted to the 1D optical modulator element 130.

Referring to FIG. 7C (hereinafter referred to as a third scan), when the projection is completed on the screen 170 in the forward direction from the first vertical scan line to the nth vertical scan line with respect to green as described above, blue Extract light intensity information for. The blue color is projected by the same method as projected on the screen 170 in the first scan.

Referring to FIG. 7D (hereinafter referred to as a fourth scan), when the projection is completed on the screen 170 in the reverse direction from the nth vertical scan line to the first vertical scan line with respect to blue as described above, red is completed. The light intensity information of any one of green, blue, and blue is extracted again.

At this time, the extracted light intensity information is a light source having a relatively weaker output than the other two light sources of the red light source 112, green light source 114, blue light source 116 constituting the light source 110 (hereinafter Is a light source having a weak output.

Here, any one of the light source systems 110 has a relatively weaker output than the other two means that the color-specific optical power ideally required to implement color image information and the color-specific information obtained from commercial laser light sources procurable as the light source. It means that the maximum optical power is compared to show the smallest ratio. This will be more apparent through the detailed description of FIG. 11 to be described later.

A light source with a weak output (red light source in this example) will be projected in the same way as it was projected on screen 170 in a second scan.

Referring to FIG. 7E, a full color image is implemented on the screen 170 for one screen by completing four scans from the first scan to the fourth scan. Here, the time required for realizing a full color image of one frame should be within 1 / (field frequency according to the television broadcasting method) seconds.

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 525 scan lines and 60 Hz field frequency. The PAL method consists of 625 scan lines and 50 Hz field frequency.

That is, if three primary colors of light, red, green, and blue, are projected once on one screen within 1 / (field frequency (for example, 60Hz for NTSC, 50Hz for PAL)) according to the field frequency, 'S eyes are seen as forming a screen in which a full-color image containing both red, green, and blue is simultaneously formed.

However, the present invention implements a full color image through a total of four scans by scanning the light source having a weak output once more to improve the brightness of the projected full color image. To this end, the galvano scanner 150a implements a full color image by performing a bidirectional scan of a total of two rotations (that is, four scans in total).

Here, one rotation of the galvano scanner 150a means when the galvano scanner 150a completes the clockwise rotation and the counterclockwise rotation, that is, the bidirectional rotation. Therefore, the time taken for the galvano scanner 150a to make two revolutions is preferably within 1 / (field frequency) seconds, and the bidirectional scan frequency of the galvano scanner 150a is preferably twice the field frequency.

8 is a diagram illustrating a method of displaying color images of consecutive frames in the present invention when the scanner is the galvano scanner 150a of FIG. 7.

Referring to FIG. 8, in the first scan, only the red light source 112 is turned on with respect to the clockwise rotation of the galvano scanner 150a, and k (any natural number) is included in the one-dimensional optical modulator element 130. Only the red information of the image information of the (th) th frame is modulated and projected in the reverse direction on the screen 170.

In the second scan, only the green light source 114 is turned on with respect to the counterclockwise rotation of the galvano scanner 150a, and only the green information is displayed among the image information of the k-th frame in the one-dimensional optical modulator element 130. This is modulated and projected forward on the screen 170.

In the third scan, only the blue light source 116 is turned on with respect to the clockwise rotation of the galvano scanner 150a, and only the blue information of the k-th frame image information is included in the one-dimensional optical modulator element 130. It is modulated and projected in reverse on the screen 170.

In the fourth scan, only a light source (in this example, a red light source) having a weak output with respect to the counterclockwise rotation of the galvano scanner 150a is turned on, and the one-dimensional optical modulator element 130 has a k-th frame. Only the color light information corresponding to the light source having the weak output among the image information of the image is modulated and projected forward on the screen 170.

As the fourth scan is performed in the first scan, a full color image corresponding to the k-th frame is completed, and the time required for the four scans is within 1/60 second based on the NTSC method. Must be made within 1/50 of a second.

After that, the processes from the first scan to the fourth scan are repeated, so that (k + 1), (k + 2), (k + 3),... The full color image corresponding to the first frame may be continuously displayed. At this time, the (k + 1), (k + 2), (k + 3), ... Of course, the first frame must be performed within 1/60 seconds using the NTSC method and within 1/50 seconds using the PAL method.

FIG. 9 illustrates a method of displaying color images of consecutive frames when the polygon mirror scanner 150b is used as another preferred embodiment of the present invention.

Although the polygon mirror scanner 150b exemplarily has a hexagonal pillar shape having a mirror on the side, the polygon mirror scanner 150b is merely an example and has various applications (for example, a shape of a general polygonal pillar). It will be readily apparent to one skilled in the art that this is possible.

As used in the description of FIG. 9, the 'first scan' to 'fourth scan' indicate the scanning order for each color light when an image of one frame is implemented as the same terms used in FIGS. 7 and 8. However, unlike the galvano scanner 150a, the polygon mirror scanner 150b in FIG. 9 rotates in one direction (either one of clockwise or counterclockwise, in this example, counterclockwise). Therefore, the scanning direction also has a unidirectional direction (either one of the reverse direction or the forward direction, in this example always the forward direction) corresponding to the rotation direction of the polygon mirror scanner 150b.

In addition, in FIG. 9, the scan by the polygon mirror scanner 150b is performed in the horizontal direction, and the modulation by the one-dimensional optical modulator element 130 is performed for each vertical line. However, in addition to this, the scan by the polygon mirror scanner 150b is performed in the vertical direction, and the modulation by the one-dimensional optical modulator element 130 may be performed for each horizontal line.

Referring to FIG. 9, only the red light source 112 for 1/6 rotation (1 / n rotation if the polygon mirror scanner has an n-shaped shape) of the polygon mirror scanner 150b in the first scan. In the on state, only one red information is modulated from the k (arbitrary natural number) -th frame image information on the one-dimensional optical modulator element 130 to be projected forward on the screen 170.

Here, the rotation of the polygon mirror scanner 150b is controlled by a scanner control signal transmitted from the image control circuit 180, and the scanner control signal causes the polygon mirror scanner 150b to rotate at a predetermined speed while having a unidirectional direction. It may be a speed control signal or a position control signal for moving to a predetermined position.

In the second scan, only the green light source 114 is turned on for the next counterclockwise 1/6 rotation of the polygon mirror scanner 150b subsequent to the first scan, and the one-dimensional optical modulator element 130 ), Only green information is modulated from the image information of the k-th frame and projected forward on the screen 170.

In the third scan, only the blue light source 116 is turned on for the next counterclockwise 1/6 rotation of the polygon mirror scanner 150b following the second scan, and the one-dimensional optical modulator element 130 ), Only blue information is modulated from the image information of the k-th frame and projected forward on the screen 170.

In the fourth scan, only the light source having a weak output for the next counterclockwise 1/6 rotation of the polygon mirror scanner 150b following the third scan is turned on, and the one-dimensional optical modulator element ( In 130, color light information corresponding to a light source having a weak output among the image information of the k-th frame (in this example, a red light source) is modulated once more and projected forward on the screen 170.

In this way, as the fourth scan is performed in the first scan, a full color image corresponding to the kth frame is completed, and the time required for 2/3 rotation (4/6 rotation) is 1 / when using the NTSC method. Within 60 seconds, it should be done within 1/50 seconds by the PAL method. Of course, when the polygon mirror scanner 150b has an n-angle column shape instead of a hexagonal column, the time required for 4 / n rotation is within 1/60 second when using the NTSC method, and 1 / when using the PAL method. It should be done in 50 seconds. Here, one rotation of the polygon mirror scanner 150b means until it returns to its original position through rotation in one direction.

Thereafter, the processes from the first scan to the fourth scan are repeated, so that (k + 1), (k + 2), (k + 3),... The full color image corresponding to the first frame may be continuously displayed. At this time, the (k + 1), (k + 2), (k + 3), ... Of course, the first frame must be performed within 1/60 seconds using the NTSC method and within 1/50 seconds using the PAL method.

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 180 according to time according to an exemplary embodiment of the present invention. FIG. 10A illustrates a case where a galvano scanner 150a is used as a scanner, and FIG. 10B illustrates a case where a polygon mirror scanner 150b is used as a scanner. In this example, it is assumed that the frame frequency is 60 Hz based on the NTSC scheme, and one frame has a period of 1/60 second (sec).

Referring to FIG. 10, the optical modulator control signal includes image information, that is, light intensity information, in order of color light corresponding to a light source having a red, green, blue, and weak output, and the one-dimensional optical modulator from the image control circuit 180. Delivered to device 130.

Only red light source 112 when red image information is transmitted, only green light source 114 when green image information is transmitted, and only blue light source 116 when blue image information is transmitted (on) The light source control signal is transmitted from the image control circuit 180 to the light source system 110. After the process is completed, the image control circuit 180 transmits a light source control signal for turning on the light source having a weak output once again to the light source system 110.

In the case of FIG. 10A, the galvano scanner 150a projects the image information once on the screen 170, and scans in the reverse direction when rotated clockwise, and scans in the forward direction when rotated counterclockwise. do.

The galvano scanner 150a completes one revolution by reciprocating in the clockwise and counterclockwise directions, that is, in both directions. Thus, by two rotations, color light corresponding to a light source having red, green, blue and weak outputs can be projected once each, thereby completing a full color image. Therefore, the time that the galvano scanner 150a rotates once is 1/120 second, and the scan frequency is 120 Hz.

In the case of FIG. 10 (b), the polygon mirror scanner 150b is projected once on the screen 170 for each image information. When rotated clockwise only, the polygon mirror scanner 150b is scanned only in the reverse direction, and rotated counterclockwise only in the forward direction. Is scanned.

The polygon mirror scanner 150b completes one rotation by rotating in only one of the clockwise or counterclockwise directions, that is, the unidirectional direction. 10B illustrates a case in which the hexagonal columnar polygon mirror scanner 150b rotates in the counterclockwise direction, thereby completing one rotation through six movements in the counterclockwise direction. Therefore, in the case where the scanner 150 is the hexagonal polygon mirror scanner 150b of the above example, color light corresponding to a light source having red, green, blue, and weak outputs can be projected once by 2/3 rotation. And completes a full color image. Therefore, one rotation time of the polygon mirror scanner 150b is 1/40 seconds, and the scan frequency is 40 Hz. However, the polygon mirror scanner shown in (b) of FIG. 10 is merely an example and may have a different scan frequency according to its shape.

FIG. 11 is a table comparing the degree of brightness enhancement during four scans with three scans according to an exemplary embodiment of the present invention.

Referring to FIG. 11, a red (R) light source among three commercial light sources of red (R), green (G), and blue (B) has a weak output.

Herein, a light source having a weak output means that one light source of three commercial light sources has a relatively weak power than the other two light sources. In addition, having a weak output means that the smallest ratio is obtained by comparing the color light output ideally required to implement color image information with the maximum light output for each color obtained from commercial laser light sources that can be procured as a light source. do.

However, FIG. 11 is only an example, and the color-specific optical power required for realizing color information and the maximum optical power for each color obtained from a commercial light source are different, respectively. It is apparent that the light source can be determined differently.

Prior to the description of the table shown in FIG. 11, each abbreviation used in FIG. 11 will be described first. 'Needs' means color-specific light output ideally required to implement color image information. 'LD Max' means the maximum light output for each color that can be obtained from a commercial laser light source that can be actually obtained as a light source at the time of manufacturing a color display device. 'Effective PW' refers to the effective light output for each color actually used in the implementation of color image information among the maximum light output for each color obtained from the commercial laser light source.

As shown in (a) to (c) of FIG. 11, the 'Needs' value may vary depending on the condition required by each display device, and the 'LD Max' value also depends on the commercial laser light source used. Accordingly, the 'Effective PW' value may be changed corresponding to the two values.

In this case, a light source having a weak output is determined as a light source corresponding to a relatively small ratio value obtained by dividing the color-specific 'LD Max' value by the color-specific 'Needs' value. For example, in FIG. 11A, the color-specific ratio values are 40/69 (0.58) for the red light source, 100/56 (1.79) for the green light source, and 50/53 (0.94) for the blue light source, respectively. Where the red light source with the smallest ratio value is determined as the light source with weak output.

In addition, in each table of FIG. 11, 'RGB' under 'Effective PW' is projected once on the screen by red, green, and blue image information. 'RRGB' refers to a color image corresponding to a light source having a weak output in addition to projecting image information of red (R), green (G), and blue (B) once on the screen. It is a case where a color image is realized by projecting image information on the screen once more, that is, scanning four times in a manner used in the present invention.

Here, the scanning order of the color light information is not limited to the alphabetical order indicated by 'RGB' and 'RRGB', and any other order may be used as long as it scans three times and four times in the above manner, respectively.

Referring to (a) of FIG. 11, as an ideal color light power for realizing color image information, 69 mW for a red (R) light source and 56 mW for a green (G) light source and a blue (B) light source, respectively. For 53 mW is required. Hereinafter, this will be abbreviated as R _ND , G _ND , and B _ND . The maximum optical power for each color of the commercial light source is 40 mW for the red (R) commercial light source, 100 mW for the green (G) commercial light source, and 50 mW for the blue (B) commercial light source. Hereinafter, this will be abbreviated as R _MAX , G _MAX , and B _MAX .

In this case, the light source with the weak output is determined as the light source corresponding to the smallest ratio value when comparing the values of R _MAX / R _ND , G _MAX / G _ND, and B _MAX / B _ND . Therefore, in this example, the values R _MAX / R _ND , G _MAX / G _ND, and B _MAX / B _ND are each 0.58 (40/69, up to 2 decimal places for calculations below), and the values below are rounded up. ), 1.79 (100/56), 0.94 (50/53), and the red (R) light source corresponding to the smallest ratio value is a light source having a weak output.

Referring to the 'RGB' column below the 'Effective PW' column in the table of FIG. 11 (a), the image information of red (R), green (G), and blue (B) is projected once on the screen. In this case, the effective optical power for each light source used in the case of implementing a color image by scanning three times is shown. Hereinafter, the effective optical power for each light source will be outlined as R _EFF , G _EFF , and B _EFF .

At this time, the effective optical power for each light source will be 1/3 of the maximum optical power for each color of the commercial light source. This is because only one third of the maximum optical power for each color obtained from each commercial light source can be used in the same time since the scanning method is performed three times within a time of 1 / (field frequency according to the television broadcasting method). . That is, it can be said that R _EFF , G _EFF , and B _EFF are theoretically 13.33 (40/3) mW, 33.33 (100/3) mW, and 16.67 (50/3) mW.

However, in order for the color image to be implemented without distortion, a ratio (69:56:53, that is, 1: 0.81: 0.77) of color-specific optical power, that is, R _ND , G _ND , and B _ND , for implementing the color image information is R _It must be maintained at _EFF , G _EFF , and B _EFF . Accordingly, as a result of adjusting the ratio based on R _EFF having the smallest value among R _EFF , G _EFF , and B _EFF , effective optical power for each light source, that is, R _EFF , G _EFF , and B _EFF (hereinafter referred to as The effective light power for each light source after adjustment is 13.33 mW, 10.82 mW, and 10.24 mW.

Here, the maximum brightness efficiency of the color display device obtained by the three-time scanning method is 1/3 (ie, 33.33%) of the maximum optical power for each color of the commercial light source, and the sum of the effective optical power for each light source after adjustment (13.33+ 10.82 + 10.24, or 34.39, divided by the sum of the maximum optical power of each commercial light source in three scans (13.33 (40/3) + 33.33 (100/3) + 16.67 (50/3), ie 63.33) Since the value is 0.54, the brightness efficiency of the three-scan color display device is 18.10 (that is, 33.33% × 0.54)%.

Compared to the three-time scanning method described above, referring to the 'RRGB' column below the 'Effective PW' column in the table of FIG. 12A, image information of red (R), green (G), and blue (B) Is projected on the screen once more, and the image information on the color light corresponding to the light source having a weak output is projected on the screen once more, that is, when the color image is implemented by scanning 4 times in the method used in the present invention. The effective optical power for each light source actually used is shown.

At this time, the effective optical power for each light source will be 1/4 of the maximum optical power for each color of the commercial light source. This is because the method of scanning four times within a time of 1 / (field frequency according to the television broadcasting method) can use only 1/4 of the maximum optical power for each color obtained from each commercial light source within the same time. .

At this time, since the image information for the color light corresponding to the light source having a weak output (in this example, the red (R) commercial light source) is projected once more on the screen, the maximum optical power that can be obtained from the red (R) commercial light source is 40. This is 80 mW, which is twice the mW. Therefore, it can be said that R _EFF , G _EFF , and B _EFF are theoretically 20 (80/4) mW, 25 (100/4) mW, and 12.50 (50/4) mW. However, in order for the color image to be implemented without distortion, a ratio (69:56:53, that is, 1: 0.81: 0.77) of color-specific optical power, that is, R _ND , G _ND , and B _ND , for implementing the color image information is R _It must be maintained at _EFF , G _EFF , and B _EFF . Accordingly, as a result of adjusting the ratio based on B _EFF having the smallest value among R _EFF , G _EFF , and B _EFF , effective optical power for each light source, that is, R _EFF , G _EFF , and B _EFF (hereinafter referred to as The effective light power for each light source after adjustment is 16.27 mW, 13.21 mW, and 12.50 mW.

Here, the maximum brightness efficiency of the color display device obtained by the four-time scanning method is 1/4 (ie, 25%) of the maximum light power for each color of the commercial light source, and the sum of the effective light power for each light source after the adjustment (16.27). + 13.21 + 12.50, or 41.98, is the sum of the maximum optical power per color of the commercial light source in four scans (10 (40/4) + 25 (100/4) + 12.50 (50/4), i.e. 47.5) Since the divided value is 0.88, the brightness efficiency of the four-scan color display device is 22.10 (that is, 25% x 0.88)%.

That is, it can be seen that the color display device of the four scan method of the present invention is improved in brightness by 22.1 (22.1% / 18.1%)% when compared to the three scan method.

(B) of Figure 11 is R _ND, G _ND, each B _ND is 79 mW, 56 mW, 53 mW and, (c) of Figure 11 is R _ND, G _ND, each B _ND is 63 mW, 58 mW, The case of 54 mW is illustrated. In FIGS. 11B and 11C, R _MAX , G _MAX , and B _MAX are 40 mW, 100 mW, and 50 mW, respectively. In the case of FIGS. 11B and 11C, the brightness efficiency of the color display apparatus can be calculated in the same manner as in FIG. 11A.

In the case of Figure 11 (b), the four-scan color display device of the present invention shows that the brightness is improved by 33.98 (23.34% / 17.42%)% compared to the three scan method, Figure 11 In case of (c), the brightness is improved by 12.6 (21.32% / 18.93%)%.

In scanning the light source having the weakest light output in the present invention on the screen 170 using the scanner 150 once again, it does not matter what order the light source is turned on. However, if two consecutive scans are performed on the light source having the weakest light output, there is an advantage in that light intensity information extraction for the light source on and off and the color light of the corresponding light source can be performed only once.

As described above, the color display apparatus and the color image control recording medium according to the present invention have the effect of realizing a color image having the maximum brightness by utilizing a commercially available commercial light source.

In addition, by using a commercial light source to scan a light source having a relatively weak output once more by selecting a combination that can produce the maximum output from the commercial light source has the effect that can implement a brighter color image.

In addition, by scanning once more for a light source having a weak output, it is possible to adjust the light output intensity of a commercial light source without adding a separate device. Therefore, the complexity of the configuration of the color display device can be prevented, and the manufacturing cost can be reduced.

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 (10)

N (N is a natural number of 3 or more) light sources for irradiating different color lights according to a light source control signal for controlling on / off; A one-dimensional optical modulator device for generating diffracted light by modulating color light emitted from the light source according to an optical modulator control signal; A scanner which scans and diffracts the diffracted light emitted from the one-dimensional optical modulator element on a screen according to a scanner control signal; And A light source control signal which receives an image signal, turns on each of the N light sources once, and turns on one light source having a relatively weakest output among the N light sources, and a turn-on state extracted from the video signal The optical modulator control signal, which is light intensity information corresponding to the light source, and the scanner control signal for controlling the rotation operation of the scanner according to the optical modulator control signal, respectively, to the light source, the one-dimensional optical modulator element, and the scanner. Image control circuit to transmit and control Color display device comprising a. The method of claim 1, And the N light sources are three color light sources of red, green, and blue which are three primary colors of light. The method of claim 1, The scanner is a galvano scanner, The galvano scanner is a bidirectional scan in one revolution, Every half rotation of the galvano scanner scans the diffracted light corresponding to any one of the N light sources, and a full color image of one frame is obtained by (N + 1) / 2 rotation of the galvano scanner. And a color display device projecting onto the screen. The method of claim 3, And (N + 1) / 2 rotation of the galvano scanner is performed within 1 / (field frequency according to the television broadcasting method) seconds. The method of claim 1, The scanner is a polygon mirror scanner having a polygonal pillar shape, and the polygon mirror scanner performs a unidirectional scan. Every time 1 / (number of side surfaces of the polygonal pillar) of the polygon mirror scanner is rotated, the diffracted light corresponding to any one of the N light sources is scanned so that (N + 1) / (the A number of sides of a polygonal pillar) and a full color image of one frame is projected onto the screen by rotation. The method of claim 5, (N + 1) / (number of sides of the polygonal pillar) rotation of the polygon mirror scanner is performed within 1 / (field frequency according to a television broadcasting method) seconds. As a recording medium that can be read by the color display device, a program of instructions for image control that can be executed in a color display device including a light source, a one-dimensional optical modulator element, and a scanner is tangibly implemented. (a) turning on any one of N light sources (N is a natural number of 3 or more) irradiating different color lights; (b) transferring light intensity information corresponding to the color light of the turned on light source to the one-dimensional optical modulator element; (c) controlling the scanner such that diffracted light generated by being modulated by the one-dimensional optical modulator element according to the light intensity information is scanned and projected on a screen; And (d) repeating the steps (a) to (c) until the light source having the weakest light output among the N light sources is turned on twice, and the remaining light sources are turned on once A recording medium on which a program for executing image control is recorded. The method of claim 7, wherein Step (a) to (c) is a recording medium having recorded thereon a program for executing video control which is performed within 1 / {(field frequency according to the television broadcasting method) x (N + 1)} seconds. As a recording medium that can be read by the color display device, a program of instructions for image control that can be executed in a color display device including a light source, a one-dimensional optical modulator element, and a scanner is tangibly implemented. (a) turning on any one of N light sources (N is a natural number of 3 or more) irradiating different color lights; (b) transferring light intensity information corresponding to the color light of the turned on light source to the one-dimensional optical modulator element; (c) controlling the scanner such that diffracted light generated by being modulated by the one-dimensional optical modulator element according to the light intensity information is scanned and projected on a screen; And (d) The light source having the weakest light output among the N light sources repeats step (c) twice in succession in the turned-on state, and the steps (a) to (c) are repeated until the other light sources are turned on once. Repeating steps A recording medium on which a program for executing image control is recorded. The method of claim 9, Step (a) to (c) is a recording medium having recorded thereon a program for executing video control which is performed within 1 / {(field frequency according to the television broadcasting method) x (N + 1)} seconds.

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