KR20100010991A - Projection display device for having variable function screen size and method of controlling the same - Google Patents

Abstract

According to an aspect of the present invention, there is provided a projection image display device for projecting an image onto a screen, the projection image display device comprising: a distance information acquisition unit for sensing image distance from the screen and obtaining image projection distance information; A size information obtaining unit obtaining size information of a screen on which the image is to be projected; A memory for storing zoom ratio information corresponding to an image projection distance and a screen size; And a controller configured to extract zoom ratio information according to the obtained image projection distance information and screen size information from the memory, and adjust the size of the projected image by applying the extracted zoom ratio information.

Description

Projection display device for having variable function screen size and method of controlling the same}

The present invention relates to an image display device, and more particularly, to a projection type image display device having a screen size variable function and a control method thereof.

In general, a projector is a kind of advanced light exchanger that displays the image enlarged through a lens by receiving signals from various video devices such as a TV, a VCR, a DVD player, a PC, a camcorder, and the like.

Unlike three-tube projectors, called beam projectors, current LCD and DLP projectors automatically display optimal screens simply by connecting various video devices without the need for settings. It is rapidly spreading for theaters.

In particular, data projectors will mainly be used for presentations using a PC, so compatibility with PC input is very important, and additional functions such as enlarging a portion of the screen will be more convenient.

Such a general projector may be composed of an engine unit (lamp unit), a power unit, a signal processing unit, and the like, and the engine unit may perform such a role by optically enlarging and displaying an input signal. It is an important factor, and lamp brightness is the most important factor that determines screen brightness.

The power supply unit may be divided into a ballast for supplying a stable power to the lamp to provide a light without a flicker, and a main power supply for supplying power to other peripherals, and a signal processor for processing an image signal. It is also called a digital board because digital signal processing is performed.

The operation principle of the projector configured as described above varies depending on the display device. However, when the common part is extracted and described, the image may be generally formed by a combination of a signal input and a signal.

On the other hand, such a projector must have a screen that can project an image differently from other display products.

In addition, screens capable of projecting the image currently exist in various sizes ranging from 40 inches to 300 inches.

However, such a projector is widely used for office and home use because it is easy to carry because it has advantages over other image display devices in terms of volume and weight. However, because of the projection type equipment, there is a limitation in space and time. There was a following issue.

In other words, when the projector is installed, the user manually adjusts the lens to fit the projection distance, adjusts the screen size, and focuses the work, which is another problem causing trouble to the user.

In addition, since the size of the screen on which the image is projected varies, it is inconvenient to change the screen size of the projector according to the screen size whenever the screen is changed.

According to an exemplary embodiment of the present invention, an image may be projected with a constant screen size regardless of an image projection distance according to the installation position of the projector.

In addition, in an embodiment of the present invention, the screen size of the projector can be adjusted according to the size of the screen on which the image is projected.

Projection type image display apparatus having a screen size variable function according to an embodiment of the present invention is a projection type image display device for projecting an image on the screen, the distance information acquisition unit for detecting the distance to the screen to obtain image projection distance information ; A size information obtaining unit obtaining size information of a screen on which the image is to be projected; A memory for storing zoom ratio information corresponding to an image projection distance and a screen size; And a controller configured to extract zoom ratio information according to the obtained image projection distance information and screen size information from the memory, and adjust the size of the projected image by applying the extracted zoom ratio information.

In addition, the control method of a projection image display device having a screen size variable function according to an embodiment of the present invention, the control method of a projection image display device for projecting an image on a screen, the distance between the screen and the projection image display device is detected Obtaining image projection distance information; Obtaining size information of a screen on which the image is to be projected; And adjusting the size of the projected image based on the obtained image projection distance information and screen size information.

According to an exemplary embodiment of the present invention, a projection image display device having a variable screen size and a control method thereof automatically change the screen size in response to a screen of various sizes ranging from 40 inches to 300 inches and an image projection distance. As the size and image projection distance are changed, the inconvenience of having to manually change the screen size is solved, thereby improving user convenience.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other embodiments included within the scope of other inventive inventions or the scope of the present invention can be easily made by adding, changing, or deleting other elements. I can suggest.

The term used in the present invention is selected as a general term widely used as possible at present, but in certain cases there is also a term arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

As shown in FIG. 1, a projection image display device having a screen variable function according to an embodiment of the present invention senses a distance between a screen 200 on which an image is output and a distance between the screen 200 and image projection distance information. A distance information acquisition unit 100 for acquiring a symbol, a size information acquisition unit 110 for acquiring size information of the screen 200, and a memory 120 for storing zoom ratio information corresponding to an image projection distance and a screen size A control unit for extracting zoom ratio information according to the obtained image projection distance information and screen size information from the memory 120 and controlling the size of the projected image to be adjusted according to the extracted zoom ratio information; 130, a projection lens 140 that enlarges / reduces the image according to the set zoom ratio information, and a projection lens driver 150 that drives the projection lens 140. The.

Hereinafter, the operation of the projection image display device having the screen variable function according to the embodiment of the present invention configured as described above will be described.

The distance information acquisition unit 100 measures the distance between the screen 200 and the projection image display device.

That is, the distance information acquisition unit 100 is formed on one side of the projection lens 140, and thus measures the image projection distance from the start point from which the image is projected to the end point where the image is output through the screen. .

Here, the distance information acquisition unit 100 is preferably a distance detection sensor for detecting the distance between a specific object and the object.

That is, the distance information acquisition unit 100 includes a signal generator (not shown) and a signal receiver (not shown), and the signal generator and the signal receiver may be provided at one side of the projection image display device. The signal generator may be provided at one side of the projection image display device, and the signal receiver may be provided at one side of the screen.

In other words, when a signal is generated from the signal generator, and thus the generated signal is reflected from the screen and received through the signal receiver, the generated signal is reflected from the screen and received through the signal receiver. The time may be measured, and the distance to the screen may be converted based on the measured time.

In addition, when a signal is generated from the signal generator, and the generated signal is received through a signal receiver provided on one side of the screen, information from the time of generation of the signal to the reception time is obtained and accordingly to the screen. The distance can be obtained.

The size information acquisition unit 110 acquires size information of the screen 200 on which the image is to be projected.

That is, there are various sizes ranging from 30 inches to 300 inches in the types of screens currently used in the market.

Then, the size of the projected image should be changed according to the size of the screen, and according to the embodiment of the present invention, the size of the projected image is adjusted based on the obtained image projection distance information and the size information of the screen. do.

Here, the size information acquisition unit 110 may obtain the size information of the screen by photographing the screen on which the image is projected, and detects the screen gain value based on the amount of light reflected through the screen. The size information of the screen can be obtained.

That is, the size information acquisition unit 110 is a photographing unit (not shown) for photographing the screen on which the image is projected, and a length sensing unit (not shown) for detecting a diagonal length of the screen based on the photographed image. And an information acquisition unit (not shown) for acquiring size information of the screen based on the diagonal length of the screen.

In other words, first, a screen on which an image is to be projected is photographed through the photographing unit, and the diagonal length of the screen is sensed in the photographed image.

At this time, the detected diagonal length of the screen is changed according to the distance between the projection image display device and the screen and the zoom ratio of the currently set projection lens.

Accordingly, the information acquisition unit obtains screen size information according to the detected diagonal length based on the image projection distance information obtained from the distance information acquisition unit 100 and the zoom ratio of the currently preset projection lens.

In addition, the size information acquisition unit 110 is an optical sensor for detecting the amount of light reflected from the screen and the gain information acquisition unit for obtaining the gain information of the screen according to the amount of light detected through the optical sensor (Not shown) and an information acquisition unit (not shown) for acquiring size information of the screen based on the obtained gain information.

That is, there is generally a gain sensor for measuring the gain, by using the screen gain information can be obtained by using the size information of the screen on which the image is projected.

In addition, the method of obtaining the zoom ratio information currently set will be described in detail below.

Image projection distance Screen size Screen diagonal length Screen gain Wide Tele Wide Tele Gain 0.88 1.6 30 3 4.65 3.2 1.18 2.15 40 4 6.2 3.1 1.48 2.7 50 5 7.75 3 1.79 3.25 60 6 9.3 2.9 2.09 3.79 70 7 10.85 2.8 2.4 4.34 80 8 12.4 2.7 2.7 4.89 90 9 13.95 2.6 3 5.44 100 10 15.5 2.5 3.31 5.98 110 11 17.05 2.4 3.61 6.53 120 12 18.6 2.3 3.91 7.08 130 13 20.15 2.2 4.22 7.62 140 14 21.7 2.1 4.52 8.17 150 15 23.25 2.0 4.83 8.72 160 16 24.8 1.9 5.13 9.27 170 17 26.35 1.8 5.43 9.81 80 18 27.9 1.7 5.74 10.36 190 19 29.45 1.6 6.04 10.91 200 20 31 1.5 6.34 11.45 210 21 32.55 1.4 6.65 12 220 22 34.1 1.3 6.95 12.55 230 23 35.65 1.2 7.26 13.1 240 24 37.2 1.1 7.56 13.64 250 25 38.75 1.0 7.86 14.19 260 26 40.3 0.9 8.17 14.74 270 27 41.85 0.8 8.47 15.29 280 28 43.4 0.7 8.77 15.83 290 29 44.95 0.6 9.08 16.38 300 30 46.5 0.5

In other words, the screen size information according to the diagonal length of the recognized screen may be obtained based on the image projection distance according to the currently set zoom ratio using the information described in Table 1 above.

In addition, the screen size information according to the recognized gain information may be obtained based on the image projection distance according to the currently set zoom ratio using the information described in Table 1 above.

Here, in Table 1, only the diagonal length corresponding to the specific zoom ratio and the image projection distance and the screen size information according to the screen gain information are present. The diagonal length along with the ability to calculate the screen gain information will be apparent to those skilled in the art.

The memory 120 stores a lookup table (LUT) for acquiring the screen size information as described in Table 1 above.

The memory 120 also stores zoom ratio information for changing the size of the image to be projected based on the obtained screen size information and image projection distance information.

Here, the zoom ratio includes a tele mode and a wide mode.

The tele mode refers to a state in which the zoom ratio of the projection lens 140 to be described later is set to the minimum, and the corresponding image is projected with the minimum size at the same distance when the tele mode is set.

In addition, the wide mode refers to a state in which the zoom ratio of the projection lens is set to the maximum, and the corresponding image is projected at the maximum size at the same distance in the wide mode.

That is, when the zoom ratio of the projection lens is set to the tele mode at the same distance as shown in FIG. 2, the corresponding image is output in a size corresponding to a 55-inch screen, and the zoom ratio of the projection lens is set to the wide mode. If set to, the video is output in a size corresponding to a 100-inch screen.

In addition to the tele mode and the wide mode, there is at least one mode corresponding thereto.

In other words, assuming that the tele mode is 0% and the wide mode is 100%, there are various zoom ratios between 0% and 100%, which is largely determined by the manufacturer of the projection lens. It can be divided into 20 stages.

Accordingly, the memory 120 stores zoom ratio information of the projection lens based on the acquired image projection distance and screen size information.

Projection dice Projection Distance (m) Diagonal Size (inch) Diagonal Size (mm) Horizontal Size (mm) vertical Size (mm) Wide Distance (m) Tele Distance (m) 30 762 664 374 0.88 1.60 40 1016 886 498 1.18 2.15 50 1270 1107 623 1.48 2.70 60 1524 1328 747 1.79 3.25 70 1778 1550 872 2.09 3.79 80 2032 1771 996 2.40 4.34 90 2286 1992 1121 2.70 4.89 92 2337 2037 1146 2.76 5.00 100 2540 2214 1245 3.00 5.44 110 2794 2435 1370 3.31 5.98 120 3048 2657 1494 3.61 6.53 130 3302 2878 1619 3.91 7.08 140 3556 3099 1743 4.22 7.62 150 3810 332 1868 4.52 8.17 160 4064 3542 1992 4.83 8.72 170 4318 3763 2117 5.13 9.27 180 4572 3985 2241 5.43 9.81 190 4826 4206 2366 5.74 10.36 200 5080 4428 2491 6.04 10.91 210 5334 4649 2615 6.34 11.45 220 5588 4870 2740 6.65 12.00 230 5842 5092 2864 6.95 12.55 240 6096 5313 2989 7.26 13.10 250 6350 5535 3113 7.56 13.64 260 6604 5756 3238 7.86 14.19 270 6858 5977 3362 8.17 14.74 280 7112 6199 3487 8.47 15.29 290 7366 6420 3611 8.77 15.83 300 7620 6641 3736 9.08 16.38

Table 2 describes screen size types, vertical, horizontal and diagonal length information for each screen type, zoom ratio information for each screen size type, and image projection distance information.

That is, when the size of the screen on which the current image is projected is 100 inches, the image having the normal size is output only when the image projection distance of 3m in the tele mode and 5.44m in the wide mode is set.

The controller 130 adjusts a zoom ratio according to the acquired image projection distance information and screen size information based on the information stored in the memory 120.

That is, the memory 120 may store the information as described in Table 2 above, or may store the zoom ratio information according to the screen size and the image projection distance by using the information.

In other words, when the size of the screen on which the current image is to be projected is 300 inches, the currently set zoom ratio is the tele mode, and the acquired image projection distance is 18m, the currently set zoom ratio is increased to increase the normal size through the screen. Allows the image of to be projected.

That is, when the screen size is 300 inches and the currently set zoom ratio is the tele mode, an image having a normal size may be projected through the screen only when the image projection distance is 16.38 m.

However, since the acquired image projection distance is 18m, the image is projected on the screen in a smaller size than the normal size.

Accordingly, the controller 130 obtains zoom ratio information according to the acquired screen size and image projection distance by using the reference information stored in the memory, and the size of the output image is obtained using the obtained zoom ratio information. Control to be adjusted.

In this case, the size of the image to be output may be adjusted by adjusting the resolution of an image signal input from the outside without adjusting the zoom ratio information. The picture quality may be impaired.

Accordingly, in an exemplary embodiment of the present invention, an image having an optimum image quality without loss of an input image is adjusted by adjusting a preset zoom ratio using a screen size and an image projection distance without changing the resolution of the input image signal. To be printed.

The projection lens 140 includes a focusing lens (not shown) for adjusting focus according to the screen size and image projection distance, and a zoom lens (not shown) for adjusting the size of an image projected on the screen. Omission).

The projection lens driver 150 adjusts the zoom ratio of the projection lens 140 based on the zoom ratio information set through the controller 130.

Substantially, the projection lens driver 150 supplies a voltage generator (not shown) for generating a voltage corresponding to the zoom ratio according to the zoom ratio set through the controller 130 and a voltage generated from the voltage generator. And a projection lens driving control unit (not shown) for controlling the driving of the zoom lens and the focusing lens of the projection lens by the supplied voltage.

In addition, the controller 130 may check the currently set zoom ratio by using the accumulated supply time of the voltage generated through the voltage generator (not shown) as described above.

That is, in order to change the zoom ratio of the projection lens 140, a 5V voltage for rotating the projection lens is supplied from the projection lens driver 150. In this case, a current is supplied using the accumulated supply time of the supplied 5V voltage. You can check the zoom ratio of the changed projection lens.

In other words, assuming that the zoom ratio of the projection lens is divided into 11 steps and that the voltage supply time for changing the zoom ratio is 1 second for each step, the zoom ratio of the projection lens is changed from minimum to maximum. The total time to do is 10 seconds.

That is, when the currently set zoom ratio is the tele mode (0%) and the 5V voltage is supplied from the projection lens driver 150 for a total of 5 seconds to rotate the projection lens, the zoom ratio of the changed projection lens is 5 You can see that it corresponds to 50% of the steps.

In addition, the supplied voltage may be a -5V voltage instead of a 5V voltage.

That is, 5V voltage is supplied (forward rotation) to adjust the zoom ratio to enlarge the image size, and -5V voltage is supplied (reverse rotation) to reduce the image size.

Therefore, when the current zoom ratio is 60% corresponding to the sixth step, when 5V voltage is supplied for a total of 1 second from the projection lens driver 150, the currently changed zoom ratio is 70% corresponding to the seventh step, When the −5V voltage is supplied from the projection lens driver 150 for a total of 1 second, the currently changed zoom ratio is 50% corresponding to five steps.

Therefore, the controller 130 stores the obtained zoom ratio in the memory 120, and provides the screen size information as reference information when initial power-on is performed later.

As described above, the image display device having the variable screen function according to the embodiment of the present invention changes the preset zoom ratio by using the screen size on which the current image is to be projected and the image projection distance indicating the distance to the screen. It is possible to output an image of optimum quality.

However, even if the zoom ratio of the projection lens 140 is adjusted at this time, an image of an abnormal size may be projected.

In other words, if the size of the screen on which the image is to be projected is 100 inches, the currently set zoom ratio is a wide mode, and the image projection distance representing the distance to the screen is 5 m, the zoom ratio may be used to output an image of a normal size. Increase the size of the output image by increasing.

However, since the currently set zoom ratio is set to the wide mode which is the maximum zoom ratio, the size of the output image cannot be enlarged at this time.

Therefore, when the zoom ratio of the projection lens needs to be adjusted, the controller 130 determines whether the normal size of the image can be changed by adjusting the zoom ratio, and when the normal size can be changed through the zoom ratio, The zoom ratio of the projection lens may be adjusted using the obtained zoom ratio information. If the normal size cannot be changed through the zoom ratio adjustment, the screen may be used by using the image projection distance information stored in the memory 120. Prints a message to adjust the distance between them.

In other words, if the size of the screen on which the image is to be projected is 100 inches, the currently set zoom ratio is a wide mode, and the image projection distance representing the distance to the screen is 5 m, the zoom ratio of the projection lens is adjusted to normalize the image. Since size adjustment is impossible, the set zoom ratio is maintained as it is so that the image projection distance representing the distance to the screen is adjusted.

That is, under the above conditions, since the image can be output in the normal size only when the image projection distance is set to 3m, a message for moving the currently arranged projection image display device forward by a specific distance is output.

When the image projection distance is adjusted according to the message, the distance information acquisition unit 100 obtains image projection distance information for determining whether the image projection distance has been normally adjusted, and the controller 130 Based on the obtained image projection distance information, a message according to any one condition of the re-adjustment of the image projection distance and the normal setting of the image projection distance is output.

As described above, the projection image display device having the variable screen size function according to the embodiment of the present invention automatically changes the screen size in response to the screen and the image projection distance of various sizes ranging from 40 inches to 300 inches. As the image projection distance is changed, the inconvenience of having to manually change the screen size may be solved, thereby improving user convenience.

The control method of the projection image display device having the variable screen size function according to the embodiment of the present invention configured as described above, first, detects the distance to the screen (S100). That is, by using a distance sensor for detecting the distance between a specific object and the object, the image projection distance from the start point from which the image is projected to the end point where the image is output through the screen is measured.

Subsequently, image projection distance information is acquired based on the detected distance to the screen (S110).

Then, the size information of the screen on which the image is projected is obtained (S120). That is, the screen on which the image is projected may be photographed to obtain size information of the screen, or the screen gain value may be detected based on the amount of light reflected through the screen to obtain size information of the screen. .

In this case, in order to obtain the screen size information, the acquired image projection distance and the currently set zoom ratio should be known. Accordingly, the obtained image projection distance and the currently set zoom ratio information may be obtained, and the obtained information may be used. Obtain size information of the screen on which the image is projected.

Subsequently, it is determined whether the size of the output image is necessary based on the obtained image projection distance information and the screen size information (S130). That is, it is determined whether an image of a normal size can be output based on the currently set zoom ratio.

If it is necessary to adjust the image size (S130), it is determined whether or not an image of a normal size can be output by adjusting the zoom ratio (S140).

Subsequently, when it is possible to output the corresponding image in a normal size by adjusting the zoom ratio (S140), the projection lens for adjusting the size of the output image based on the obtained image projection distance information and screen size information. The zoom ratio information is obtained (S150).

The zoom ratio of the projection lens 140 is adjusted using the obtained zoom ratio information (S160).

In addition, if it is impossible to output the corresponding image in the normal size by adjusting the zoom ratio (S140), image projection distance information for outputting the corresponding image in the normal size is obtained (S170). That is, without changing the zoom ratio of the currently set projection lens, obtain image projection distance information that can output a normal image on the screen in the currently set mode.

Subsequently, using the obtained image projection distance information, a message for moving the position of the currently displayed image display apparatus is output (S180).

As described above, the control method of the projection image display device having the variable screen size function according to an embodiment of the present invention automatically changes the screen size in response to screens and image projection distances of various sizes ranging from 40 inches to 300 inches. As the screen size and the image projection distance are changed, the inconvenience of having to manually change the screen size may be solved, thereby improving user convenience.

1 is a block diagram showing the configuration of a projection image display device having a screen variable function according to an embodiment of the present invention.

2 is a view for explaining an image size according to a zoom ratio of a projection lens provided in a general projection image display device.

3 is a view for explaining a method for obtaining zoom ratio information currently set in a projection image display device according to an embodiment of the present invention;

4 is a flowchart for explaining step-by-step a control method of a projection image display device having a screen variable function according to an embodiment of the present invention.

<< Explanation of symbols for main part of drawing >>

100: distance information acquisition unit 110: size information acquisition unit

120: memory 130: control unit

140: projection lens driver 150: projection lens

Claims (12)

In the projection image display device for projecting an image on the screen, A distance information acquisition unit that detects a distance from the screen and obtains image projection distance information; A size information obtaining unit obtaining size information of a screen on which the image is to be projected; A memory for storing zoom ratio information corresponding to an image projection distance and a screen size; And, And a control unit for extracting zoom ratio information according to the obtained image projection distance information and screen size information from the memory and adjusting the size of the projected image by applying the extracted zoom ratio information. Projection type image display device with a function. The method of claim 1, Projection lens; And a projection lens driver configured to adjust the zoom ratio of the projection lens according to the zoom ratio information set by the controller. The method of claim 1, The size information acquisition unit And a screen varying function for capturing the screen on which the image is projected and obtaining size information of the screen based on the diagonal length of the photographed screen. The method of claim 1, The size information acquisition unit And a gain value of the screen based on the amount of light reflected from the screen, and detecting the size of the screen based on the obtained gain value. Following any one of claims 3 and 4, And the memory further includes screen size information for diagonal lengths according to an image projection distance and a zoom ratio or screen size information for screen gain values. The method of claim 1, And the memory further comprises an image varying distance information stored according to a zoom ratio currently set for each screen size. The method of claim 6, And the control unit outputs a message for adjusting the distance to the screen based on the image projection distance information stored in the memory when the zoom ratio is not adjusted. In the control method of a projection image display device for projecting an image on the screen, Sensing image distance between the screen and the projection image display device to obtain image projection distance information; Obtaining size information of a screen on which the image is to be projected; And, And adjusting the size of the projected image based on the obtained image projection distance information and screen size information. The method of claim 8, Acquiring size information of the screen Photographing a screen on which the image is projected; Obtaining a diagonal length of a screen from the captured image; And obtaining screen size information corresponding to the obtained diagonal length on the basis of the currently set zoom ratio and the image projection distance. The method of claim 8, Acquiring size information of the screen Obtaining a gain value of the screen based on the amount of light reflected from the screen; And detecting the size of the screen based on the obtained screen gain value. The method of claim 8, Adjusting the size of the projected image And controlling a zoom ratio of the projection lens based on the obtained image projection distance and screen size. The method of claim 11, Determining whether the zoom ratio of the currently set projection lens is adjustable; And outputting a message for adjusting the distance to the screen when the zoom ratio of the projection lens cannot be adjusted.

Images