KR100826350B1 - Resolution controller in the display system using optical diffractive modulator - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resolution adjusting device and a method for adjusting such a difference when an input resolution and an output possible resolution differ in a display system using a diffractive optical modulator.

Diffraction Optical Modulator, Resolution, Input Resolution

Description

Resolution controller in the display system using diffractive optical modulator and its method {Resolution controller in the display system using optical diffractive modulator}

1 is a perspective view of an open hole-based diffractive light modulator according to the prior art.

2 is a plan view of the open hole-based diffractive optical modulator of FIG.

3 is a conceptual diagram illustrating a problem caused by a difference between an input image resolution and an output image resolution in a display system using a diffractive optical modulator according to the prior art.

4 is a block diagram of a display system using a diffractive optical modulator with a resolution adjustment function according to an embodiment of the present invention.

5 is a block diagram of a resolution adjusting device in a display system using a diffractive optical modulator according to an embodiment of the present invention.

FIG. 6A illustrates a structure of image data of one frame including 240 X 320 pixels, and FIG. 6B illustrates a structure diagram in which input image data is transposed from a horizontal arrangement to a longitudinal arrangement.

7A is a conceptual diagram of a method for adjusting resolution of input image data into output image data according to an embodiment of the present invention, and FIG. 7B is a diagram of adjusting resolution of input image data into output image data according to another embodiment of the present invention. Conceptual diagram of how to.

8A is a configuration diagram according to an embodiment of the image correction unit of FIG. 5, and FIG. 8B is a configuration diagram according to another embodiment of the image correction unit of FIG.

9 is a conceptual diagram illustrating a method of converting vertical image data using a change amount between pixels in the method of converting vertical image data of the present invention.

10 is a conceptual diagram showing a result of adjusting the resolution when the input resolution is n and the output resolution is 2n.

11 is a flowchart illustrating a resolution adjusting method in a display system using a diffractive optical modulator according to an embodiment of the present invention.

12 is a flowchart of a resolution adjusting method in a display system using a diffractive optical modulator according to another embodiment of the present invention.

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

402: display optical system 404: display electronic system

406: light source 408: illumination optical unit

410: diffractive optical modulator 412: projection unit

416: filter optics 418: screen

510: Image input unit 520: Image pivot unit

530: Image data storage unit 540: Image correction unit

550: image data output unit 560: optical modulator driving circuit

810, 820: Original image input unit 812, 822: Original image allocator

814, 828: residual pixel value generator 824: inter-pixel gradient calculator

826: Original image residual pixel allocator

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a resolution adjusting device and a method for adjusting such a difference when an input resolution and an output possible resolution differ in a display system using a diffractive optical modulator.

As a next-generation display device, various flat panel displays (FPDs) are being actively researched. Among them, generalized display devices include liquid crystal displays (LCDs) using electro-optical characteristics of liquid crystals, and gases. And a plasma display panel (PDP) using discharge.

Among them, a liquid crystal display device (hereinafter, abbreviated as "LCD") has a narrow viewing angle and a slow response time, and requires a thin film transistor (TFT) and an electrode using a semiconductor manufacturing process. There is a difficulty.

Plasma display panel (PDP) has the advantage that the manufacturing process is simple and advantageous to large area, but the power consumption is large, and the discharge and luminous efficiency is low and expensive.

The development of a new display device that can solve the problems of the flat panel display device is in progress, and recently, the pixel (Pixel) using a micro electromechanical system (hereinafter, abbreviated as "MEMS") is an ultra-fine processing technology. A display device capable of displaying an image by forming a fine spatial light modulator (SLM) has been proposed.

Here, the spatial light modulator (SLM) is a converter for modulating the incident light beams in a spatial pattern corresponding to the electrical or optical input. Incident light can be modulated in its phase, intensity, polarization or direction, and light modulation can be achieved by various materials with various electro-optic or magneto-optic effects, and by materials that modulate the light by surface modification. have.

1 is a perspective view of an open hole-based diffractive light modulator according to the prior art.

Referring to the drawings, the open hole-based diffractive light modulator according to the prior art includes a substrate 101.

In addition, the open hole-based diffractive light modulator includes an insulating layer 102 formed on the substrate 101.

In addition, the open-hole-based diffraction type optical modulator is formed in a portion of the insulating layer 102, and the space between the holes 106aa to 106nb of the upper reflectors 106a to 106n and the upper reflectors 106a to 106n. It includes a lower reflector 103 for reflecting the light incident through the.

In addition, the open hole-based diffractive optical modulator has a pair of side support members 104 and 104 'formed at positions spaced apart from each other on the surface of the substrate 101 with the lower reflector 103 positioned therebetween. It is included.

In addition, the open-hole-based diffraction type optical modulator is supported on both sides by a pair of side support members 104 and 104 ', spaced apart from the substrate 101, and has a central portion movable up and down, and an upper reflector at the central portion. Holes (not shown) corresponding to the holes 106aa to 106nb formed in the 106a to 106n are formed, and include a plurality of laminate supporting plates 105a to 105n forming an array.

In addition, the open-hole-based diffraction type optical modulator is formed at the center portion of the laminate supporting plates 105a to 105n and has holes 106aa to 106nb at the center to reflect some of the incident light and some to holes 106aa. Top reflectors 106a to 106n passing through ˜106nb) and forming an array.

In addition, the open-hole-based diffraction type optical modulators are formed on the laminate support plates 106a to 106n and are spaced apart from each other, and are positioned on the side support members 104 and 104 ', and the laminate support plates 106a to 106n are disposed. A plurality of pairs of piezoelectric bodies 110a to 110n and 110a 'to 110n' for moving up and down are provided.

Here, the pair of piezoelectric materials 110a to 110n and 110a 'to 110n' include lower electrode layers 110aa to 110na and 110aa 'to 110na', piezoelectric material layers 110ab to 110nb and 110ab to 110nb ', and upper electrode layers 110ac. When the voltage is applied to ˜110 nc 110 ac Accordingly, the upper reflection parts 106a to 106n also move up and down.

On the other hand, when light is incident on the upper reflecting portions 106a to 106n of the open hole diffraction type optical modulator, the upper reflecting portions 106a to 106n reflect some light and some of the light through the holes 106aa to 106nb. The lower reflector 103 reflects the light passed through the holes 106aa to 106nb of the upper reflector 106a to 106n.

As a result, the reflected light reflected by the upper reflector 106a to 106n and the reflected light reflected by the lower reflector 103 form diffracted light having various diffraction coefficients, and the light intensity of the diffracted light is determined by the upper reflector 106a. 106n) and the step difference between the lower reflector 103 become maximum when the wavelength of the incident light becomes λ, and becomes an odd multiple of λ / 4, and becomes a minimum when the even multiple becomes even.

Here, one upper reflector 106a and a lower reflector 103 corresponding thereto may form scanning diffraction point light for forming pixels of an image formed on the screen. To describe this in more detail, referring to FIG. 2, a diffractive optical modulator includes a, b, c, c, d, e, ..., nth pixels of an image formed on a screen. N upper reflection parts 106a to 106n corresponding to each of the pixels. Referring to the diffractive light modulator with reference to one upper reflector of reference numeral 106a, the reflected light reflected from the reflecting surfaces 106a1, 106a2, and 106a3 of the upper reflector 106a and the open hole 107a1 of the upper reflector 106a. , 107a2, 107a3-, where 107a3 is the distance between the upper reflector 106a and the adjacent upper reflector 106b) so that the reflected light reflected by the lower reflector 103 forms diffracted light. The diffracted light becomes scanning diffracted point light corresponding to the pixels of the image formed on the screen.

That is, each of the upper reflectors 106a to 106n forms a scanning diffraction point light corresponding to the pixel of the image formed on the screen together with the reflection surface of the lower reflector 103 corresponding thereto. Aligned in line to form a scan line (here, the scan line is assumed to be composed of n scanning diffraction point lights corresponding to n pixels).

On the other hand, the diffraction type optical modulator described above can be used in various applications, for example, it can be used in a display device.

However, when the display system using the diffractive optical modulator described above is used in a portable device, since the resolution of the image provided by the portable terminal device is low resolution, when the inputted image is projected as it is, the high resolution is lower than the screen size. There is a problem that it is difficult to obtain image quality.

That is, in the case of a display device generally used in a portable terminal device, the image resolution input to the display device due to lack of video communication capacitor and small screen size is 176 * in the case of QCIF (Quarter Common Intermediate Format). For 144 resolution, 352 * 288 resolution is provided for CIF (Common Intermediate Format) method, and 320 * 240 resolution for QVGA (Quarter Video Graphics Array) method.

In this case, when the diffraction type optical modulator can realize the resolution of 480 * 640, if the image resolution input to the display device of the portable terminal device is input and the projection is performed without any manipulation, the resolution is lower than the screen size. Due to this, it is difficult to obtain high quality image quality.

Referring to FIG. 3, when the vertical resolution of the image input to the display device of the portable terminal device is v and the number of pixels that the diffractive light modulator can form is p> v, the pixel formed by the diffractive light modulator is formed. There are extra pixels in. If such an extra pixel exists and no value is defined for the extra pixel, the image quality will drop dramatically.

Accordingly, the present invention has been made to solve the above problems, in the case of a display system using a diffractive optical modulator when the input resolution and the output resolution is different, it is possible to adjust such a difference to prevent image degradation. It is an object of the present invention to provide a resolution adjusting device and a method thereof.

An apparatus of the present invention for achieving the above object, in a display system including a light source system, an illumination optical unit, a diffraction type optical modulator, a projection and scanning optical unit, and a screen, input image data from the outside Receiving image input unit; An image correction unit converting the low resolution image data received by the image input unit into high resolution image data and outputting the converted high resolution image data; And an optical modulator driving circuit configured to generate a driving voltage for driving the diffractive optical modulator according to the image data output from the image correcting unit and to drive the diffractive optical modulator.

In addition, the method of the present invention is a display system comprising a light source system, an illumination optical unit, a diffractive optical modulator, a projection and scanning optical unit, and a screen, wherein (a) the image input unit inputs image data from the outside; Receiving step; (b) an image correction unit converting the low resolution image data received by the image input unit into high resolution image data and outputting the converted high resolution image data; And (c) generating and outputting, by an optical modulator driving circuit, a driving voltage for driving the diffractive optical modulator according to the image data output from the image correcting unit.

4, a resolution adjusting apparatus and a method thereof in a display system using a diffractive optical modulator according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 4.

4 is a block diagram of a display system using a diffractive optical modulator with a resolution adjustment function according to an embodiment of the present invention.

Referring to FIG. 4, a display apparatus using a diffraction type optical modulator with a resolution adjusting function according to an embodiment of the present invention includes a display optical system 402 and a display electronic system 404.

The display optical system 402 includes a light source 406 that generates and emits light, and the light source 406 includes a vertical external cavity surface emitting laser (VECSEL) and a vertical resonance surface emitting laser (VCSEL). Light sources fabricated using semiconductors such as Cavity Surface Emitting Lasers, Light Emitting Diodes (LEDs), Laser Diodes (LDs), and Super Luminescent Diodes (SLEDs) may be used.

The light source 406 emits a laser light, the cross section of the laser light is circular, the intensity profile of the light has a Gaussian distribution, for example, the light source 406 (actually the laser of the R light source, G light source Laser, B light source laser) can emit R light, G light, B light sequentially.

In addition, the display optical system 402 includes an illumination optical unit 408 to irradiate the light emitted from the light source 406 to the diffractive light modulator 410 as parallel light having a linear shape.

The illumination optical unit 408 converts the laser light emitted by the light source 406 into linear light having a long length and a narrow width, and then converts the laser light into parallel light and enters the diffracted light modulator 410.

The illumination optical unit 408 may be made of, for example, a convex lens (not shown) or may include a convex lens (not shown) and a collimating lens (not shown).

In addition, the display optical system 402 includes a diffractive light modulator 410 which diffracts the linear light irradiated from the illumination optical unit 408 to generate diffracted light having a plurality of diffraction orders in which the light intensity of the diffracted light is adjusted. .

Here, the diffracted light emitted by the diffractive light modulator 410 includes diffracted light having various diffraction orders such as 0th diffraction light, ± 1st order diffraction light, ± 2nd order diffraction light, ± 3rd order diffraction light, and the like. Odd-order diffraction light and even-order diffraction light differ in phase from each other by 180 degrees.

The diffracted light emitted from the diffractive light modulator 410 becomes a diffracted light having a long line shape and a narrow width.

 In addition, the diffracted light emitted by the diffractive light modulator 410 is a diffracted light corresponding to one pixel of an image formed on the screen 418 by the diffracted light formed by one upper reflector and a lower reflector corresponding thereto. The diffracted light formed by the two or more upper reflectors and the lower reflector corresponding thereto may form diffracted light corresponding to one pixel formed on the screen 418.

Next, the display optical system 402 is a projection unit 412 for scanning the screen 418 by directing the diffracted light having a plurality of diffraction orders emitted from the diffractive light modulator 410 toward the screen 418 ) Is included.

As such, the projection unit 412 scans the screen 418 by directing the diffracted light toward the screen 418. As an example of the projection unit 412, the projection lens (not shown) and the diffracted light are screened. And a scanner (not shown) that performs scanning to face 418.

The projection lens (not shown) consists of a combination of a plurality of convex lenses and a plurality of concave lenses, and serves to focus incident light so as to focus the diffracted light on the screen 418.

The scanner (not shown) may be a galvanometer scanner or a polygon mirror scanner. The galvano scanner has a rectangular plank shape and a mirror is attached to one side. Rotate left and right about the axis within a predetermined angle range. Polygon mirror scanners have the shape of a polygonal column, with mirrors attached to the sides of the polygonal column. A mirror attached to each side surface rotates in one direction about an axis to change an angle of reflection of light incident by the rotation to project an image on the screen 418.

In addition, the display optical system 402 is positioned between the projection unit 412 and the screen 418 and transmits the diffracted light of the order desired to be used in the various orders of diffracted light projected from the projection unit 412 to the screen 418. It includes a filter optical portion 416 to pass through. One example of the filter optics 416 may be a slit.

On the other hand, the display electromagnetic field 404 is connected to the light source 406, the diffractive light modulator 410, and the projection unit 412.

The display field 404 provides power to the light source 406.

The display electromagnetic field 404 supplies driving voltages to the upper electrode layers and the lower electrode layers of the plurality of piezoelectric elements of the diffractive optical modulator 410 to drive the respective upper reflectors.

In this case, the display electromagnetic field 404 adjusts the resolution of the image input from the outside to provide the driving voltage according to the adjusted resolution to the diffractive optical modulator 410. That is, the display electromagnetic field 404 adjusts the resolution to 480 * 640 when the QVGA type 320 * 240 resolution image is received from the outside, and provides the driving voltage to the diffractive optical modulator 410 accordingly. .

5 is a configuration diagram of a resolution adjusting apparatus in a display system using a diffractive optical modulator according to an embodiment of the present invention.

11 is a flowchart illustrating a method of adjusting a resolution in a display system using a diffractive optical modulator according to an embodiment of the present invention, and FIG. 12 is a display system using a diffractive optical modulator according to another embodiment of the present invention. Is a flowchart of a resolution adjustment method.

Referring to FIG. 5, in a display system using a diffractive optical modulator according to an embodiment of the present invention, a resolution adjusting apparatus includes an image input unit 510 and an image input unit 510 that receive image data from the outside. An image pivot unit 520 which performs data transpose for converting the image data arranged in the longitudinal direction in the longitudinal direction, an image data storage unit 530 which stores the image data transposed by the image pivot unit 520, The image corrector 540 adjusts the vertical resolution of the image data that has been transposed from the image pivot unit 520, and the image data output unit 550 outputs the image whose vertical resolution is adjusted by the image corrector 540. And an optical modulator driving circuit 560 for generating a driving voltage of the diffractive optical modulator according to the image data of the image data output unit 550.

Here, the image input unit 510 receives image data from an external device, and in the case of a portable terminal, receives image data from a baseband processor or a multimedia processor of the portable terminal (steps S100 and S200).

In this case, when the image input unit 510 receives QCIF, an image of one frame includes row length (K) = 144 pixels and column length (L) = 176 pixels. The image consists of row length (K) = 288 pixels and column length (L) = 352 pixels.In the case of QVGA, the image of one frame has row length (K) = 240 pixels and column length (L) = 320 It consists of pixels.

At this time, the image pivot unit 520 performs a data transpose for converting the image data arranged in the horizontal direction in the longitudinal direction, and converts the image data input in the horizontal direction into the image data in the longitudinal direction (step S102). , 202). The reason why the data pivot is required in the image pivot unit 520 is that the scanning lines emitted from the diffractive optical modulator are scanning diffraction corresponding to a plurality of pixels (for example, 480 pixels when the image data emitted is 480 * 640). This is because the point lights are arranged vertically so that they can be scanned and displayed in the horizontal direction.

That is, as shown in Fig. 6A, the input image data is aligned in the lateral direction. However, in the diffractive optical modulator, as illustrated in FIG. 2, the plurality of upper reflectors are arranged in the longitudinal direction, and the plurality of image data are displayed while scanning in the lateral direction.

Therefore, in order to form a frame image by using a scanning line using a diffractive optical modulator, it is necessary to convert the image data arranged in the lateral direction into the image data arranged in the longitudinal direction.

In other words, FIG. 6A shows the structure of one frame of image data composed of 240 × 320 pixels in the case of QVGA type image data. The image data shown in Fig. 6A is input from the outside in the transverse direction, that is, in the order of (0,0), (0,1), (0,2), (0,3).

However, since 240 longitudinally arranged data are required using a diffractive optical modulator, as shown in Fig. 6B, the input image data must be transposed from the transverse arrangement to the longitudinal arrangement.

As such, the image pivot unit 520 stores the image of the data transpose in the image data storage unit 530.

The image correction unit 540 reads the type data from the image data stored in the image data storage unit 520 and transposed by the image pivot unit 520 (steps S104 and 204) to adjust the vertical resolution. The displayed vertical resolution (steps S106 to 108 and 206 to 214).

An example of vertical resolution adjustment performed by the image corrector 540 is illustrated in FIG. 7A. Referring to FIG. 7A, the image corrector 540 allocates the original image at a predetermined pixel interval from the image data stored in the image data storage 530, and remains in the remaining pixel between the pixel to which the original image is allocated and the pixel. The average of the upper and lower pixel values of the pixel is assigned. This will be described with reference to the detailed block diagram of the image corrector 540 of FIG. 8A.

First, the original image input unit 810 of the image corrector 540 reads the original image stored in the image data storage unit 530 (step S104), and the original image allocator 812 is the original image input unit 810. ) Assigns the read image at regular pixel intervals. When the vertical resolution of the input image data is v, the output resolution of the diffractive optical modulator is p, and p = 2v, the original image is spaced by one pixel. (Step S106).

In other words, the original image allocator 812 first assigns p to each of 2v calculated by multiplying v by 2 and subtracting 1 from 2v. That is, when the input image data is pixel 1, the original image allocator 812 multiplies 1 by 2 to obtain 2 and subtracts 1 to allocate pixel 1 of the input image to pixel 1 of the output image data. In the case of the pixel 2 of the input image data, multiply 2 by 2 to obtain 4 and subtract 1 from the pixel 3 of the output image data to assign the pixel 2 value of the input image data. Perform.

As described above, the residual pixel value generator 814 allocates all the images inputted by the original image inputter 810 to the original image allocator. There is a residual pixel between the pixel and the pixel, and the residual pixel is assigned a value obtained by combining the pixel values of the original image data (step S108). The residual pixel value generator 814 may assign an average value of the upper pixel value and the lower pixel value of the residual pixel to the residual pixel in a manner of generating an image value to be assigned to the residual pixel. For example, referring to FIG. 7A, in the case of pixel p = 2 of the output image data, the average value obtained by dividing by 2 after adding the pixel value assigned to pixel p = 1 and the pixel value assigned to p = 3 is equal to pixel p = 2. Assign to 2. For example, referring to FIG. 7A, when the pixel p = 4 of the output image data, the average value obtained by dividing by 2 after the pixel p = 3 assigned pixel value and p = 5 assigned pixel value is added to the pixel p = 4. Allocate

In this case, when the pixel p = n of the output image data, if p = n is the residual pixel, the pixel value of the residual pixel can be obtained by the combination of p = n-1 and p = n + 1. You can get pixel values for pixels and increase the resolution.

Meanwhile, another example of vertical resolution adjustment performed by the image corrector 540 is illustrated in FIG. 7B. Referring to FIG. 7B, the image correcting unit 540 allocates the original image at a predetermined pixel interval from the image data stored in the image data storage unit 530, and remains in the remaining pixel between the pixel to which the original image is allocated and the pixel. The average value of the upper pixel value and the lower pixel value of the pixel is allocated. If the difference between the upper pixel value and the lower pixel value is greater than or equal to a predetermined value, the upper pixel value or the lower pixel value is assigned as it is and the average value is not assigned. That is, the image correction unit 540 obtains the difference between the pixel value of the upper pixel and the lower pixel with respect to the residual pixel, and if the difference is less than or equal to the predetermined value, allocates an average value of the upper pixel value and the lower pixel value of the residual pixel. If it is over a certain value, an upper pixel value or a lower pixel value is allocated. As shown in FIG. 9A, when the average value according to the exemplary embodiment described with reference to FIGS. 7A and 8A is allocated to a section in which the pixel and the pixel value are rapidly changed, the boundary may become unclear. Of course, as shown in FIG. 9B, an average value according to the exemplary embodiment described with reference to FIGS. 7A and 8A is not allocated to the section in which the pixel and the pixel value are gently changed. Therefore, in another embodiment of the image corrector 520 of the present invention, an appropriate value is assigned to the remaining pixels in consideration of the sudden change of the pixels.

This will be described with reference to the detailed block diagram of the image corrector 540 of FIG. 8B.

First, the original image input unit 820 of the image corrector 540 reads the original image stored in the image data storage unit 530 (step S204), and the original image allocator 822 is the original image input unit 820. ) Assigns the read image at regular pixel intervals. When the vertical resolution of the input image data is v, the output resolution of the diffractive optical modulator is p, and p = 2v, the original image is spaced by one pixel. (Step S206).

Then, the inter-pixel gradient calculator 824 calculates a change amount of the pixel value of the pixel and the pixel. Subtract the pixel value of the lower pixel of the residual pixel from the pixel value of the upper pixel of the residual pixel, and then obtain the absolute value by subtracting the absolute value. Find the amount of change in pixels and pixels in pixels. In this case, it is determined whether the gradient between the pixel calculated by the inter-pixel gradient calculator 824 and the pixel is greater than or equal to a predetermined value (step S210). The allocator 824 assigns pixel values for the remaining pixels (step S212). That is, referring to FIG. 7B as an example, in the case of pixel p = 2 of the output image data, if a value obtained by subtracting a pixel value assigned to p = 3 from a pixel value assigned to pixel p = 1 becomes a predetermined value or more, the pixel The value of pixel p = 1 is assigned to p = 2 as it is. This is also shown in the case of the pixel p = 10 of the output image data in Figure 7b, in this case, if the value obtained by subtracting the pixel value assigned to p = 11 from the pixel value assigned to the pixel p = 9 is a certain value or more The value of pixel p = 9 is assigned to p = 10 as it is.

On the other hand, when the pixel-to-pixel gradient calculated by the inter-pixel gradient calculator 824 has a predetermined value or less, the residual pixel value generator 828 generates a pixel value for the corresponding residual pixel (step 214).

When the residual pixel value generator 828 allocates all the input images by the original image allocator 822, residual pixels are generated between pixels of the output image data to which pixel values of the original image data are allocated. The value obtained by combining the pixel values of the original image data is assigned to. The residual pixel value generator 828 may assign an average value of the upper pixel value and the lower pixel value of the residual pixel to the residual pixel in a manner of generating an image value to be assigned to the residual pixel. That is, referring to FIG. 7B as an example, in the case of pixel p = 4 of the output image data, the average value obtained by dividing by 2 after adding the pixel value assigned to pixel p = 3 and the pixel value assigned to p = 5 is equal to pixel p = Assign to 4. In other words, referring to FIG. 7B, for example, in the case of pixel p = 6 of the output image data, the average value obtained by dividing by 2 after the pixel p = 5 assigned pixel value and p = 7 assigned pixel value is added is equal to pixel p = 6. Assign.

In this case, when the pixel p = n of the output image data, when p = n is the remaining pixel, when the pixel-to-pixel slope is above a certain value, the original image is allocated as it is, and the pixel-to-pixel slope is below a certain value. By combining the values of p = n-1 and p = n + 1, the pixel values for the remaining pixels can be obtained, so that the pixel values for all the pixels can be obtained and the resolution is increased.

Meanwhile, the method of generating the residual pixel values of the residual pixel value generators 814 and 828 of the image corrector 540 by using the average value has been described above, but various other methods are possible. For example, there may be a method of varying weights of the upper and lower pixels of the residual pixel.

That is, when the residual pixel to be generated by the residual pixel value generators 814 and 828 of the image corrector 540 is the 2n-th pixel, the upper pixel is 2n-1 pixel and the lower pixel is 2n + 1. The weights can be set differently as shown in (1).

f (2n) = w1 * f (2n-1) + w2 * f (2n + 1)

Here, w1 and w2 represent weights.

For example, when w1 = 1 and w2 = 1, the result of the application is shown in FIG. 10, and as shown, there is a smooth and smooth change in gray level.

On the other hand, when the resolution of the input image data is n and the resolution that can be output is N * n (N≥2), P = 0,1,2, ... N-1 (N, P). Can be generalized as follows.

If the nth row data of the input image data is f (n) and the n + 1st row data is f (n + 1), the N * n- (N-1) th row data of the output image data is [(N -0) * w1 * f (n) + (0) * w2 * f (n + 1)] / N, and the N * n- (N-2) th row data of the output image data is [(N- 1) * w1 * f (n) + (1) * w2 * f (n + 1)] / N, and the N * n- (N-3) th row data of the output image data is [(N-2) ) * w1 * f (n) + (2) * w2 * f (n + 1)] / N, ... The N * n- (NP-1) th row data of the output image data is [(NP ) * w1 * f (n) + (P) * w2 * f (n + 1)] / N, w1 and w2 are weights.

If the above generalization is applied when N = 3, it is as follows.

If the nth row data of the input image data is f (n) and the n + 1st row data is f (n + 1), the 3 * n- (2) th row data of the output image data is f (n). 3 * n- (1) th row data of output image data becomes [2 * w1 * f (n) + w2 * f (n + 1)] / 3, and 3 * n th row of output image data The data becomes [w1 * f (n) + (2) * w2 * f (n + 1)] / 3.

On the other hand, the image data output unit 550 reads and outputs the image data corrected by the image correcting unit 540 (steps S110 and 216).

The optical modulator driving circuit 422 applies an upper electrode driving voltage corresponding to the gray level from the image data output unit 550 to the upper electrode layer of each upper reflector of the diffractive optical modulator. It drives (step S112, 218).

According to the present invention as described above, when the low-resolution image data is input, there is an effect that it is possible to easily implement a resolution higher than the resolution of the input image data.

In addition, according to the present invention, when the low resolution image data is input, it is possible to ensure the image data of a sufficient resolution by adjusting the appropriate resolution, it is possible to prevent the degradation of the image quality.

According to the present invention, when the resolution of the input image data is converted to the resolution of the output image data, the resolution can be changed in consideration of the amount of change between pixels to obtain a change in resolution having a clear boundary.

Claims (16)

A display system comprising a light source, an illumination optical unit, a diffractive optical modulator, a projection and scanning optical unit, and a screen, An image input unit which receives image data from an external source; An image correction unit converting the low resolution image data received by the image input unit into high resolution image data and outputting the converted high resolution image data; And An optical modulator driving circuit which generates a driving voltage for driving a diffractive optical modulator according to the image data output from the image correcting unit, and drives the diffractive optical modulator, The image correction unit, An original image allocator for allocating image data received from the image input unit to corresponding pixels of output image data at predetermined intervals; And a residual pixel value generator configured to form a residual pixel value by combining the upper pixel and the lower pixel value of the residual pixel with respect to the residual pixel of the output image data and assign the residual pixel value to the residual pixel. The method of claim 1, And the image correcting unit corrects the vertical resolution in the low resolution image data to form high resolution image data. The method of claim 2, The low resolution image data input by the image input unit is one of a resolution of QCIF (Quarter Common Intermediate Format), a resolution of 352 * 288 of CIF (Common Intermediate Format), and a resolution of QVGA (Quarter Video Graphics Array). A resolution adjusting device characterized by the above-mentioned. The method of claim 1, After the image input unit, Resolution adjustment is performed by converting the horizontally aligned image data inputted to the image input unit into a longitudinal direction by converting the horizontally input image data into longitudinal image data and including an image pivot unit. Device. The method of claim 4, wherein Further comprising a memory for storing the image data transposed from the image pivot unit, The image correction unit, And an image data output unit configured to sequentially read and output data from the first column data to the last column data of the image data in the memory. delete The method of claim 1, The image correction unit, An original image residual pixel allocator for allocating an upper pixel or a lower pixel value of the residual pixel to the residual pixel of the output image data; And Calculating the amount of change of the upper pixel and the lower pixel value of the residual pixel of the residual image of the output image data and controlling the residual pixel value generator to generate a pixel value for the residual pixel when the amount of change is less than a predetermined value, And an inter-pixel gradient calculator configured to control the original image residual pixel allocator to allocate the original image when the amount of change is greater than or equal to a predetermined value. The method according to claim 1 or 7, The residual pixel value generator, And an average of upper and lower pixel values of the residual pixel as the pixel value of the residual pixel with respect to the residual pixel of the output image data. The method according to claim 1 or 7, The residual pixel value generator, And reconciling the residual pixels of the output image data with different weights in combining the upper pixel and the lower pixel values of the residual pixel. A display system comprising a light source, an illumination optical unit, a diffractive optical modulator, a projection and scanning optical unit, and a screen, (a) receiving an image data from an external image input unit; (b) an image correction unit converting the low resolution image data received by the image input unit into high resolution image data and outputting the converted high resolution image data; And (c) an optical modulator driving circuit generating and outputting a driving voltage for driving the diffractive optical modulator according to the image data output from the image correcting unit; In step (b), (d) converting the image data input in the lateral direction into the image data in the longitudinal direction by performing a data transpose for translating the horizontally aligned image data inputted to the image input unit in the longitudinal direction; (e) assigning, by the original image allocator, the image data received from the image input unit to the corresponding pixel of the output image data at regular intervals; And and (f) a residual pixel value generator combining the upper and lower pixel values of the residual pixel with respect to the residual pixel of the output image data to form a residual pixel value and assigning the residual pixel value to the residual pixel. The method of claim 10, And adjusting the vertical resolution in the low resolution image data to form high resolution image data in the step (b). The method of claim 10, The low resolution image data input to the image input unit of step (a) is selected from among QCIF (Quarter Common Intermediate Format) resolution, CIF (Common Intermediate Format) resolution, and QVGA (Quarter Video Graphics Array) resolution. Resolution adjustment method characterized in that one. delete The method of claim 10, In step (b), (g) the inter-pixel slope calculator calculating and calculating a change amount of the upper pixel and the lower pixel value of the residual pixel with respect to the remaining pixel of the output image data to determine whether the change amount is less than a predetermined value; (h) performing step (f) if the determination result of step (g) is less than or equal to a predetermined value; And and (i) causing the original image residual pixel allocator to allocate an upper pixel or a lower pixel value of the residual pixel to the residual pixel when the determination result of step (g) is equal to or greater than a predetermined value. The method according to claim 10 or 14, In the step (f) of generating a residual pixel value, And an average of upper and lower pixel values of the residual pixel as the pixel value of the residual pixel with respect to the residual pixel of the output image data. The method according to claim 10 or 14, In the step (f) of generating a residual pixel value, And combining the upper and lower pixel values of the residual pixel with different weights with respect to the residual pixel of the output image data.

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