KR20040050464A - Apparatus and method for displaying the operation state and correcting keystone distortion using laser beam in a image display device - Google Patents

Abstract

PURPOSE: An apparatus and a method are provided to display an operational state of an image display unit and to correct keystone by displaying the operational state of the image display unit on a screen using a separate display unit. CONSTITUTION: A projector(200) includes a microcomputer(10') for controlling various components of the projector(200), a remote signal receiving section(12) for receiving ON/OFF signals from a remote controller(13) positioned at an external portion of the projector(200), and an AC power receiving section(24) for receiving AC power from an external device. A power section(14) is provided to supply driving voltage to each component of the projector(200). A lamp provides white light to an LCD panel section(18). A cooling fan(20) is provided to lower a temperature of the lamp. A laser beam generating section(26) is provided to project a laser beam onto a screen.

Description

Display and operation of keystone correction device and method of image display device using laser beam {APPARATUS AND METHOD FOR DISPLAYING THE OPERATION STATE AND CORRECTING KEYSTONE DISTORTION USING laser

The present invention relates to an image display device and method capable of displaying an operation state and correcting a keystone, and more particularly, to display an operation state of an image display device externally by using a laser beam, and to correct keystones displayed on a screen. A video display device and a method thereof.

Recently, with the development of the information industry, the demand for a video display device capable of displaying a large screen image is increasing. As such, a projection image display device is widely used as an image display device capable of displaying a large sized image, and an LCD projector is particularly preferred. In addition to the applications such as seminar presentations, such LCD projectors are increasingly being used as display devices for home digital TVs.

1 is a block diagram showing a schematic configuration of a conventional video display device, such as an LCD projector 100.

Referring to FIG. 1, the LCD projector 100 includes a microcomputer 10 that controls each component in the projector, a remote controller receiver 12 that receives an ON / OFF signal from a remote controller 13 located outside the projector. And converting AC power provided from the AC power receiver 24 according to the control signal of the microcomputer and an AC power receiver 24 that receives AC power from the outside to provide driving power to each component. A power supply unit 14, a lamp 16 for providing white light to the LCD panel unit 18, a cooling fan 20 for lowering the temperature of the lamp, and a light emitting element such as an LED for displaying the operating state of the projector. It is provided with the state display part 22 comprised.

The state display unit 22 is generally installed on the upper surface of the projector as shown in FIG. 2, and the user can grasp the operation state of the projector through the state display unit 22.

As described above, in the conventional projector, since the status display unit is usually installed on the upper surface of the projector, when the projector is mounted on the ceiling, the user can operate the projector normally after the operation state of the projector, in particular, the power ON signal is input. There is a problem that it is difficult to visually identify whether or not.

In addition, even when the projector is installed on a horizontal plane, when the projector is used in a large place, it is difficult for a user to identify an LED, such as an LED, of a status display unit located at an upper surface of the projector at a long distance.

On the other hand, the projector needs keystone correction as an additional function not found in other display devices. Keystone refers to a distortion phenomenon in which a projected non-rectangular image is displayed on a screen while light projected in the projector passes through a projection lens.

Hereinafter, with reference to FIGS. 3A and 3B and FIGS. 4A and 4B, the reason why the above-described keystone distortion occurs is described. 3A and 3B show regions and shapes of images displayed on a screen during the projection of an LCD projector, respectively. As shown in Fig. 3A, when the projector is installed on a horizontal plane such as a table and the image is projected in the reverse direction, the uppermost projection distance d1 and the lowermost projection distance d2 become equal (i.e., d1 = d2), a rectangular image is displayed as shown in FIG. 3B. However, in this case, a problem arises in that an image is displayed under the extension line of the horizontal plane where the projector is installed.

In order to solve the above problem, the image is projected onto the screen in the upward projection method as shown in FIG. 4A. In this case, d1> d2, and the image displayed on the screen becomes trapezoidal as shown in FIG. 4B. As described above, a distortion phenomenon in which an image projected on the screen becomes trapezoidal is called keystone.

In order to correct such a keystone distortion phenomenon, the user has corrected the image so that the image becomes a rectangle through the naked eye, but in this case, there is no separate reference point, so the shape of the image is different according to the individual, and the operation is unfamiliar. There is a problem that it takes a long time to correct.

The present invention is to solve the above problems by recognizing this problem, by providing a means to more easily determine the operating state of the projector, and by providing a separate reference for keystone correction.

Accordingly, a first object of the present invention is to display an operation state of the projector on a screen by providing a separate display device in addition to displaying the operation state of the projector on the upper surface of the projector, so that the user can easily operate the operation state of the projector. It is to provide a projection image display device that can be grasped.

In addition, it is a second object of the present invention to provide a projection type image display device that provides a reference point on a screen during keystone correction so that a user can correct keystone more accurately and easily by referring to the keystone correction.

Other objects and advantages in addition to the above objects and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

1 is a block diagram schematically showing the configuration of a conventional LCD projector;

2 is a view showing a position of a state display unit for displaying an operation state of a projector in a conventional LCD projector.

3A and 3B are diagrams illustrating the shape of an image projected on a screen during non-directional projection in a conventional LCD projector.

4A and 4B are diagrams illustrating the shape of an image projected on a screen during upward projection in a conventional LCD projector.

5 is a block diagram schematically showing the configuration of an LCD projector according to a preferred embodiment of the present invention;

6 is a perspective view schematically showing the appearance of an LCD projector according to a preferred embodiment of the present invention;

7A to 7C are diagrams showing a keystone correction method in a projector according to a preferred embodiment of the present invention.

8 is a flowchart for explaining an operation state display and a keystone correction algorithm of a projector according to a preferred embodiment of the present invention.

Description of the main parts of the drawing

10, 10 ': micom 12: remote control receiver 13: remote control

14: power supply portion 16: lamp 18: LCD panel portion

20: cooling fan 22: status display portion 24: AC receiver

26: projection lens 28: laser beam generator 30: laser beam point

100: LCD projector

The projection image display device according to the first aspect of the present invention comprises at least one micom for controlling the operation of the projection image display device and a front side of the projection image display device, and a predetermined control signal transmitted from the micom. And a laser beam generator for projecting a laser beam on the screen, wherein the laser beam projected by the laser beam generator forms a laser beam point of a predetermined shape on the screen.

In a preferred embodiment according to the above feature, when the power ON signal is received from the outside, the microcomputer projects the laser beam from the laser beam generator on the screen until the lamp is turned on.

Further, in a preferred embodiment according to the above feature, when the keystone correction command signal is received from the outside, the microcomputer projects the laser beam on the screen from the laser beam generator.

According to a second aspect of the present invention, there is provided a method of displaying an operating state of a projection image display device, in a standby mode, receiving a power ON signal from an external source and turning on a laser beam generator to project a laser beam onto a screen. And turning on the lamp cooled to a predetermined temperature, and turning off the laser beam generator to stop the projection of the laser beam, wherein the laser beam projected from the laser beam generator is a laser beam on a screen. Form a point.

The keystone correction method of the projection image display device according to the third aspect of the present invention comprises the steps of receiving a keystone correction command signal from the outside, turning on the laser beam generator to project a laser beam on the screen, and receiving from the outside Correcting the keystone in response to the predetermined keystone correction signal, and turning off the laser beam generator in response to the keystone correction completion signal received from the outside.

In a preferred embodiment according to the above features, the laser beam projected from the laser beam generator forms a rectangular laser beam point on the screen.

According to the present invention, it is possible to more easily grasp the operation state of the projection type image display device through the laser beam projected on the screen, and the laser beam point formed on the screen serves as a reference point when the keystone is corrected. Keystone correction can be performed.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to FIGS. 5 to 8.

5 is a block diagram schematically showing the configuration of an LCD projector according to a preferred embodiment of the present invention. For reference, the same or similar reference numerals are given to the same or corresponding components as those of the conventional LCD projector illustrated in FIG. 1, and descriptions of the components having the same function will be omitted.

Referring to FIG. 5, the projector 200 according to an exemplary embodiment of the present invention receives an ON / OFF signal from a microcomputer 10 ′ controlling each component in the projector and a remote controller 13 located outside the projector. A remote control receiver 12, an AC power receiver 24 for receiving AC power from the outside, and AC power supplied from the AC power receiver 24 to the control signal of the microcomputer to convert each component. A power supply unit 14 for supplying driving power to the lamp, a lamp for providing white light to the LCD panel unit 18, a cooling fan 20 for lowering the temperature of the lamp, an LED lamp for displaying an operating state of the projector, and the like. And a status display section 22 composed of a light emitting element, and a laser beam generating section 26 for projecting a laser beam on the screen.

As shown in FIG. 6, the laser beam generator 26 is disposed at four corners of the front part of the projector. When the power of the projector is turned on, the laser beam generator 26 projects four laser beam points 30 by projecting the laser beam onto a screen. ) (See FIGS. 7A-7C). These four laser beam points are displayed on the screen after the power ON signal is input in the standby mode until the lamp is turned on to inform the user that the projector is operating.

In addition, as shown in FIG. 7A, since the laser beam projected by the laser beam generator 26 goes straight without passing through the lens, the laser beam point 30 formed on the screen is shown in FIGS. 7B and 7C. As shown, it has a rectangular shape. Since the laser beam point 30 forms a rectangular shape having a size similar to the size of the image to be projected on the screen, the user can quickly and accurately correct the keystone by using the laser beam point 30 as a reference point during keystone correction. You can correct it.

7B and 7C illustrate an example of correcting a keystone based on the laser beam point 30. That is, FIG. 7B illustrates a state in which a trapezoidal image is displayed before correction, and FIG. 7C illustrates a state in which a rectangular image is displayed by performing keystone correction using the laser beam point 30 as a reference point.

Hereinafter, the operation of the LCD projector according to the preferred embodiment of the present invention having the above-described configuration will be described in more detail. 8 is a flowchart showing an operation state display and a keystone correction algorithm when the projector is turned on.

Referring to FIG. 8, in the standby mode (step 110), the microcomputer 10 ′ indicates that the standby mode is in a state display unit including a light emitting device such as an LED (step 112). Next, when the power ON signal is input from the remote controller (step 114), the microcomputer generates a laser beam on the screen by generating the laser beam in the laser beam generator 26 (step 115), and the operation of the projector is started. Display is made on the display section 22 (step 116). Next, the microcomputer starts the cooling fan 20 (step 118), and turns the lamp on after sufficiently cooling the lamp (step 120). Next, after displaying the current operating state of the projector on the status display section 22 (step 122), the laser beam generating section is turned off to stop the projection of the laser beam (step 124). Next, the projector enters the normal ON mode (step 126). Next, when a signal for commanding keystone correction is received from the user (step 128), the microcomputer projects a laser beam from the laser beam generator 26 to form a laser beam point on the screen (step 130). Next, the micom outputs a keystone correction OSD on the screen (step 132). In response to the keystone correction signal generated as the user operates the keystone correction key while viewing the screen and the OSD, the keystone is corrected (step 134). At this time, the user can correct the keystone more quickly and accurately based on the laser beam point formed on the screen. Then, when a keystone correction completion signal is received indicating that the keystone correction is completed (step 136), the keystone correction OSD is turned off (step 138). Next, the laser beam generator is turned off (step 140). This terminates the display of the projector's operation status and the keystone correction algorithm during the ON operation of the projector.

Meanwhile, in the embodiment described with reference to FIG. 8, the operation state display and keystone correction of the projector are performed in a series of operating algorithms, but need not be limited thereto. For example, an embodiment of performing an operation algorithm composed of only one of a series of steps of displaying the operation state of the projector and a series of steps of keystone correction is possible.

On the other hand, it is preferable that at least one laser beam generator is provided in the front portion of the projector. In particular, when displaying the operation state, at least one laser beam point is preferably formed on the screen, and in keystone correction, at least four laser beam points are preferably formed on the screen to form a rectangular shape. .

According to the present invention, since the operation state of the projector can be displayed on the screen through the laser beam point formed on the screen by the laser beam projected from the laser beam generator installed in the front part of the projector, the projector is installed on the ceiling. Even in this case, the user can grasp the operating state of the projector at a glance. In addition, even when the projector is used in a large space, there is an advantage that the operating state of the projector can be easily identified through the laser beam point formed on the screen.

On the other hand, since the laser beam point formed on the screen has a rectangular shape, it can serve as a reference point for correction during keystone correction of the projector. Therefore, the user can correct the keystone more quickly and accurately based on the laser beam point.

In the above, the present invention has been described with reference to the preferred embodiment. Those skilled in the art will appreciate that the present invention may be modified without departing from the spirit and scope of the invention. In other words, the present invention may be modified within the scope of the appended claims and should not be considered as being limited to the above-described exemplary embodiments.

Claims (6)

In the projection image display device, A microcomputer for controlling an operation of the projection image display device; At least one or more disposed on the front portion of the projection image display device, comprising a laser beam generator for projecting a laser beam on the screen in response to a predetermined control signal transmitted from the microcomputer, And a laser beam projected from the laser beam generator to form a laser beam point on a screen. The method of claim 1, And the micom is configured to project the laser beam onto the screen from the laser beam generator until the lamp is turned on when the power ON signal is received from the outside. The method of claim 1, And the micom projects the laser beam onto the screen from the laser beam generator when the keystone correction command signal is received from the outside. The method according to any one of claims 1 to 3, There are a plurality of laser beam points formed on the screen, And said plurality of laser beam points form a rectangular shape. In the method for displaying the operating state of the projection type image display device having a laser beam generator in the front surface, Receiving a power on signal from an external device in a standby mode; Turning on the laser beam generator to project a laser beam onto a screen; Turning on the lamp cooled to a predetermined temperature; Turning off the laser beam generator to stop projection of the laser beam; And a laser beam projected from the laser beam generator to form a laser beam point on a screen. In the keystone correction method of a projection type image display device having a plurality of laser beam generator in the front surface, Receiving a keystone correction command signal from which an external keystone correction is performed; Turning on the laser beam generator to project a laser beam onto a screen; Correcting the keystone in response to a predetermined keystone correction signal received from the outside; Turning off the laser beam generator in response to a keystone correction completion signal indicating that keystone correction received from the outside is completed; Keystone correction method of the projection image display device comprising a.