JP2013110612A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform optimal color correction of projection light by changing a sensing area of an RGB sensor lest light from an area other than a projection area is received, corresponding to an interchangeable lens/zoom lens/shift lens.SOLUTION: An optical sensor of a projector device comprises a sensing area variable function capable of changing the sensing area and is capable of controlling the sensible area of the optical sensor so as to cope with the size of a projection image changed according to a zooming function, or the position of the projection image according to an optical shift function or an electrical control shift function, or the size/position of the projection image changed according to an interchangeable optical system, thereby performing control to correct the color of a screen surface in accordance with an output from the optical sensor.

Description

  The present invention relates to an image display device that receives an image signal and displays the input image. In particular, the present invention relates to an image display device that projects a display image onto a screen or the like, and further corrects the projection image according to the color of the screen or the display area of the projection image.

  In recent years, projector apparatuses that can input RGB output signals, which are electrical signals output from a PC, are often used as monitor apparatuses for viewing PC images by a plurality of people. In addition, when creating materials to be viewed by a plurality of people as slide image data, most of them are created using presentation software. Slide creation by presentation software is generally performed on a PC monitor, and a projector device different from the PC monitor used at the time of slide creation is often used for presentation.

  Also, depending on the installation environment of the projector device, there is a case where a wall such as a conference room is used as if it is a screen without using a screen, and the color of the wall in this case is not always white. . As described above, there are cases where the color of the displayed image differs greatly between the PC monitor used at the time of slide creation and the projector device at the time of presentation. Therefore, it is desirable to adjust the projector device so that the color characteristic is suitable for display in the presentation environment, and the projector device administrator needs to adjust the adjustment items of the projector device in a timely manner in order to improve the image quality. As another means, there is a projector apparatus equipped with a function of acquiring a color of a projection area such as a screen or a wall with an RGB sensor and performing color correction by a color correction processing circuit in the projector apparatus.

  In addition, a projection lens in a projector apparatus often has a zoom function. The zoom function changes the size of the display image projected by the projector device. Further, there is a projector device that can select a plurality of projection lenses according to the zoom magnification. Furthermore, there is a projector device in which a shift function is mounted on a projection lens, and the position of a display image to be projected can be shifted. As described above, even when the projection position fluctuates, the color information only in the projection area that does not include the color information outside the projection area is acquired, and the optimum color intended by the document creator is acquired using the acquired color information. It is desirable to correct the projected image so as to obtain characteristics.

  In a projector apparatus equipped with an RGB sensor and color correction processing, Patent Document 1 is known as a technique for avoiding as much as possible that light from other than the image projection area is incident on an RGB sensor that is a light receiving element. In Patent Document 1, a light restricting member that restricts light incident from the projection surface is used to limit the incident light from other than the image projection area to the light receiving element such as an RGB sensor, and to perform appropriate correction. It is a thing.

JP 2007-79003 A

  However, in the method described in Patent Document 1, the zoom function is limited to the incident light in the projection area at the zoom end, and no reference is made to the incident light when the zoom magnification varies. Furthermore, no mention is made regarding the interchangeable lens and the shift function.

  For this reason, when the projection lens is replaced or when the projection position is changed by the shift function, the light receiving element such as the RGB sensor cannot always perform the optimum correction. Alternatively, only the overlapping area of all the projection areas that change with the zoom function, the interchangeable lens, and the shift function is sensed, which increases the possibility of erroneous correction, which is not realistic.

  Therefore, the purpose of this method is to provide a technique that enables sensing only in an optimum area with respect to a projection area that changes according to a zoom function, an interchangeable lens, and a shift function in a projector apparatus.

In order to achieve the above object, a two-dimensional image is generated by controlling light emitted from a lamp, which is a light source, using a RGB image signal input from an input means, and controlling a spatial light modulator using the RGB image signal. A projector device capable of projecting and optically imaging the two-dimensional image on a screen surface, wherein the projector device is capable of changing a size of the projected two-dimensional image, or a projection function. An optical shift function capable of changing the position of the two-dimensional image, or an electric control shift function capable of changing the position of the two-dimensional image by changing the positions of the RGB image signal and the spatial light modulator, or the screen. An interchangeable optical system capable of changing an optical system for imaging, and an optical sensor for sensing the amount of light incident from the screen surface;
The optical sensor has a sensing area variable function that allows a sensing area to be changed, and projects according to the size of a projected image that is changed according to the zoom function, or the optical shift function or the electrical control shift function. The sensing area of the photosensor can be controlled to correspond to the position of the image or the size / position of the projected image that is changed according to the interchangeable optical system, and the screen can be controlled according to the output of the photosensor. An image display device characterized by controlling to correct the color of the surface is proposed.

  By using this method, it is possible to perform sensing only in an optimum area with respect to a projection area that changes according to the zoom function, the interchangeable lens, and the shift function in the projector apparatus. As a result, it has become possible to perform automatic color adjustment of the projector device so as to obtain optimum characteristics for display in a presentation environment.

Explanatory drawing of the liquid-crystal projector apparatus of Example 1. FIG. Example flow chart Explanatory drawing of reverse VT conversion processing Illustration of zoom / shift function Explanatory drawing of aperture 30 Explanation of the operation of the diaphragm 30 Explanation of the operation of the diaphragm 30 FIG. Explanatory drawing of the liquid crystal projector apparatus of Example 2. FIG. Illustration of 2D RGB sensor

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Example 1]
FIG. 1 shows a first embodiment using the liquid crystal projector apparatus of the present invention.

  In FIG. 1, 1 is a digital RGB input terminal, 2 is an analog RGB input terminal, and 3 is a video input terminal. Reference numeral 4 denotes a receiver that receives digital RGB input signals, and reference numerals 5 and 6 denote analog-digital conversion circuits (AD conversion circuits) that convert analog signals into digital signals. Reference numeral 7 denotes a video decoder that inputs an AD-converted digital video signal and outputs a digital signal representing luminance and two types of digital signals representing color. The video decoder output is inputted to the matrix circuit 8 and is converted into a digital RGB signal. Is converted to The receiver 4 output, the AD conversion circuit 5 output, and the matrix circuit 8 output are input to an input selector circuit indicated by 9. The digital RGB signal selected by the input selector circuit 9 is input to the resolution conversion circuit 11 and converted into the resolution / frame display frequency of the liquid crystal panel indicated by 20 via the frame memory 10. An image processing circuit 12 performs trapezoidal correction processing / OSD addition, test pattern output, and the like on the RGB signal output from the resolution conversion circuit 11 in accordance with a control signal output from the control unit 26.

  Reference numeral 29 denotes a color correction processing circuit which inputs RGB signals output from the image processing circuit 12 and performs color correction processing such as gain conversion / offset conversion on the RGB signals and outputs them. Reference numeral 13 denotes an inverse VT correction circuit which inputs the RGB signal output from the color correction processing circuit 29 and outputs the RGB signal so as to reversely correct the input voltage-light transmission characteristic (VT characteristic) of the liquid crystal panel 20. . Reference numeral 14 denotes a non-uniformity correction circuit. When an image with uniform RGB data is input in the entire area of the image, the projected image is uniformly projected in the plane, so that the non-uniformity in the panel plane is suppressed. Control panel drive voltage. A panel output processing circuit 15 converts the output signal of the unevenness correction circuit 14 into a signal that can drive the liquid crystal panel. Reference numeral 16 denotes a power source, and reference numeral 17 denotes a lamp driving circuit (ballast) that generates a stable high voltage supplied from the power supplied from the power source 16 to the lamp 18.

  Reference numeral 19 denotes an integrator optical system, which improves the uniformity of the light output from the lamp 18. The light having improved uniformity after passing through 19 passes through the liquid crystal panel 20 controlled by the panel output processing circuit 15, and is projected onto the screen 22 through the projection lens 21. Although not described in FIG. 1, the light passing through the integrator optical system 19 is split into RGB and used as an RGB light source. The light from the RGB light source passes through one liquid crystal panel 20 and the RGB light that has passed through the three liquid crystal panels is condensed to form a color image, which is projected through the projection lens 21. Reference numeral 23 is a remote control light receiving unit, and 24 is a PC communication terminal. The remote control light receiving unit 23 receives the infrared light for controlling the liquid crystal projector from the remote control outside the liquid crystal projector device, and the control unit 26 controls the liquid crystal projector device. Further, when the liquid crystal projector device is controlled from the PC, or conversely, a control signal for controlling the PC from the liquid crystal projector device is transmitted / received by the PC communication terminal 24. When the liquid crystal projector device is controlled from the PC, the control unit 26 The control operation is performed.

  Reference numeral 25 denotes a control button mounted on the liquid crystal projector apparatus main body, and a control signal from the control button 25 controls the liquid crystal projector apparatus via the control unit 26. A synchronization signal input terminal 27 receives a horizontal / vertical synchronization signal of an analog RGB signal from the analog RGB input terminal 2. A synchronization processing circuit 28 performs synchronization separation processing from a video signal input from the video input terminal 3 and synchronization signal processing of a digital RGB signal input from the digital RGB input terminal 1. Further, the synchronization signal processing of the analog RGB signal input from the synchronization signal input terminal 27 is performed, and the synchronization signal processing circuit 28 outputs it to the control unit 26. Reference numeral 30 denotes a diaphragm, 31 denotes a condenser lens, and 32 denotes an RGB sensor. The projection light of the liquid crystal projector device projected on the screen 22 passes through the diaphragm 30 and the condenser lens 31 and is input to the RGB sensor 32. The RGB sensor 32 outputs color information of the projection light projected on the screen 22 to the control unit 26.

  FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.

  When the liquid crystal projector device is in the (21) projection light color correction state, (22) the image processing circuit 12 ignores the currently input image signal and outputs a white image. The white image output from the image processing circuit 12 drives the liquid crystal panel 20 and projects white light by the inverse VT correction circuit 13, the unevenness correction circuit 14, and the panel output processing circuit 15. (23) The intensity of the R component, G component, and B component of the white light projected on the screen 22 is transmitted to the control unit 26 by the RGB sensor 32 through the diaphragm 30 and the condenser lens 31. The (24) The control unit 26 compares the R / G / B sensor output ratio input from the RGB sensor 32 with the reference RGB sensor output ratio unique to the projector apparatus that does not require correction, and corrects the projection light. Determine the need for When it is determined that the projection light correction is necessary, (25) the control unit 26 sets the VT characteristic of the liquid crystal panel 20 so that the R / G / B sensor output value becomes the reference RGB sensor output ratio. Considering this, the RGB gain setting value, which is a correction amount, is calculated. (26) The correction amount calculated by the control unit 26 is input to the color correction processing circuit 29, and gain processing is performed on the RGB signal output from the image processing circuit 12, and (27) the projection light correction state ends. To do.

  FIG. 3 is an explanatory diagram of an RGB gain correction value calculation that is a correction amount. FIG. 3A shows VT characteristics of the liquid crystal panel 20, and the transmittance of the liquid crystal panel proportional to the amount of projection light with respect to the input voltage applied to the liquid crystal panel 20 is as shown in FIG. Suppose there is. In other words, the transmittance is 0% when the input voltage is a, and the transmittance is 25, 50, 75, and 100% when the input voltage is b, c, d, and e.

  FIG. 3B is an explanatory diagram of the inverse VT conversion process performed by the inverse VT correction circuit 13. When the input level of the inverse VT correction circuit 13 is Ic in FIG. 3B, the inverse VT correction circuit 13 having the characteristics of FIG. 3B outputs level c. The output level c is input to the liquid crystal panel 20 having the VR characteristics shown in FIG. 3A, and the liquid crystal panel 20 is driven so that the transmittance is 50%. In other words, if the input level Ia = 0, Ib = 0.5, Ic = 0.75, Id = 0.875, Ie = 1.0, the transmittance {0%, 25% for the input level {0, 0.5, 0.75, 0.875, 1.0} , 50%, 75%, 100%}.

As an example, the reference RGB sensor output ratio unique to the projector apparatus in a state where no correction is required is R: G: B = 1.00: 1.00: 1.00
And

When the projection light color correction process is selected in an environment where the light is projected onto a blue screen or wall, the received light-receiving RGB sensor output ratio is R: G: B = 0.75: 0.75: 1.00
In this case, the display color has changed to blue for white projection.

Therefore, it is necessary to correct the B light quantity by 0.75 times to improve the color characteristics of the projection light. That is, in order to set the transmittance of the liquid crystal panel 20 shown in FIG. 3A to 75%, as shown in FIG. 3B, the input level input to the inverse VT correction circuit 13. Need to be 0.875 times. In this example, the RGB gain correction value is
R: G: B = 1.00: 1.00: 0.875
It becomes. The RGB gain correction value output from the control unit 26 is input to the color correction processing circuit 29, and gain processing is performed on the RGB signal.

  FIG. 4 is an explanatory diagram of the (A) zoom function / (B) shift function of the liquid crystal projector apparatus. FIG. 4A shows the zoom function, and the display area when the projection zoom lens is projected on the tele side is indicated by a white square, and the display area when the projection zoom lens is projected on the zoom side is shown. Shown in gray squares. FIG. 4B shows the shift function. The display area when the projection shift lens is projected at the shift center is indicated by a white square, and the display area when the projection shift lens is projected in the shift state. Shown in gray squares. FIG. 4B shows an explanatory diagram when the shift state is shifted in three directions, left and right, and upward. The shift function can be configured not only by using the shift lens described above but also by moving the transfer data position to the liquid crystal panel 20 in the horizontal or vertical direction.

  FIG. 5 is an explanatory diagram of the diaphragm 30. Here, the diaphragm 30 is a liquid crystal diaphragm and is divided into 8 × 8, and the transmitted light can be controlled for each region.

  FIG. 6 is an explanatory diagram of the operation of the diaphragm 30. FIG. 6A shows a case where the projection zoom lens of the liquid crystal projector device is projecting on the telephoto side, and the light passage area of the diaphragm 30 is narrowed so as to receive the reflected light from only the projection area. . On the other hand, FIG. 6B shows a case where the projection zoom lens of the liquid crystal projector is projecting on the zoom side, and in this case as well, the aperture 30 is received so as to receive the reflected light only from the projection area. The light passage area is widened.

  FIG. 7 is a diagram for explaining the operation of the diaphragm 30. FIG. 7A shows a case where the projection shift lens of the liquid crystal projector device is projecting at the shift center, and the light passage region of the diaphragm 30 is at the center so as to receive the reflected light from only the projection area. . On the other hand, FIG. 7B shows a case where the projection shift lens of the liquid crystal projector device is shifted to the right and projects, and in this case as well, the diaphragm is received so as to receive the reflected light only from the projection area. The 30 light passage region changes to the right.

  Although not particularly described here, when the replacement projection lens is used, the liquid crystal diaphragm of the diaphragm 30 may be changed corresponding to the replacement projection lens. Further, in this embodiment, the liquid crystal diaphragm is described as the configuration of the diaphragm 30, but it may be a mechanism having a mechanism for changing the amount of light passing through the diaphragm 30 by mechanical driving, or a projection lens shift mechanism. The amount of light passing through the aperture 30 may be changed in conjunction with the above.

[Example 2]
FIG. 9 is a second example of FIG. 8. FIG. In FIG. 8, 801 is a digital RGB input terminal, 802 is an analog RGB input terminal, and 803 is a video input terminal. Reference numeral 804 denotes a receiver that receives a digital RGB input signal, and reference numerals 805 and 806 denote analog-digital conversion circuits (AD conversion circuits) that convert analog signals into digital signals. Reference numeral 807 denotes a video decoder that inputs an AD-converted digital video signal and outputs a digital signal that represents luminance and two types of digital signals that represent color. The video decoder output is input to the matrix circuit 808, and the digital RGB signal is output. Is converted to The receiver 804 output, the AD conversion circuit 805 output, and the matrix circuit 808 output are input to an input selector circuit indicated by 809. The digital RGB signal selected by the input selector circuit 809 is input to the resolution conversion circuit 811 and converted into the resolution / frame display frequency of the liquid crystal panel indicated by 820 via the frame memory 810. Reference numeral 812 denotes an image processing circuit, which performs trapezoidal correction processing / OSD addition, test pattern output, and the like on the RGB signal output from the resolution conversion circuit 811 in accordance with a control signal output from the control unit 826.

  Reference numeral 829 denotes a color correction processing circuit which inputs RGB signals output from the image processing circuit 812, performs color correction processing such as gain conversion / offset conversion on the RGB signals, and outputs them. Reference numeral 813 denotes an inverse VT correction circuit which receives the RGB signal output from the color correction processing circuit 829 and outputs the RGB signal so as to reversely correct the input voltage-light transmission characteristic (VT characteristic) of the liquid crystal panel 820. . 814 is a non-uniformity correction circuit, and when an image with uniform RGB data is input in the entire area of the image, the projected image is uniformly projected in the plane, so that the non-uniformity in the panel plane is suppressed. Control panel drive voltage. A panel output processing circuit 815 converts the output signal of the unevenness correction circuit 814 into a signal that can drive the liquid crystal panel.

  Reference numeral 816 denotes a power source, and reference numeral 817 denotes a lamp driving circuit (ballast) that generates a stable high voltage supplied to the lamp 818 from electric power supplied from the power source 816. Reference numeral 819 denotes an integrator optical system, which improves the uniformity of the light output from the lamp 818. The light with increased uniformity that has passed through 819 passes through the liquid crystal panel 820 controlled by the panel output processing circuit 815, and is projected onto the screen 822 through the projection lens 821. Although not described in FIG. 8, the light that has passed through the integrator optical system 819 is split into RGB and used as an RGB light source. Each of the light from the RGB light sources passes through one liquid crystal panel 820, and the RGB light that has passed through the three liquid crystal panels is condensed to form a color image, which is projected through the projection lens 821.

  823 is a remote control light receiving unit, and 824 is a PC communication terminal. The remote control light receiving unit 823 receives the infrared light for controlling the liquid crystal projector from the remote control outside the liquid crystal projector device, and the control unit 826 controls the liquid crystal projector device. In addition, when the liquid crystal projector device is controlled from the PC, or conversely, a control signal for controlling the PC from the liquid crystal projector device is transmitted and received by the PC communication terminal 824. The control operation is performed. Reference numeral 825 denotes a control button mounted on the liquid crystal projector apparatus body, and a control signal from the control button 825 controls the liquid crystal projector apparatus via the control unit 826. Reference numeral 827 denotes a synchronization signal input terminal, from which an analog RGB signal horizontal / vertical synchronization signal is input from an analog RGB input terminal 802. A synchronization processing circuit 828 performs synchronization separation processing from a video signal input from the video input terminal 803 and synchronization signal processing of a digital RGB signal input from the digital RGB input terminal 801. Further, synchronization signal processing of analog RGB signals input from the synchronization signal input terminal 827 is performed, and the synchronization signal processing circuit 828 outputs to the control unit 826.

  Reference numeral 830 denotes a diaphragm, 831 denotes a condenser lens, 832 denotes a two-dimensional RGB sensor, and 833 denotes a timing generator. The projection light of the liquid crystal projector device projected on the screen 822 passes through the diaphragm 830 and the condenser lens 831 and passes through RGB. Input to the sensor 832. The RGB sensor 832 outputs color information corresponding to the two-dimensional position information of the projection light projected on the screen 822 to the control unit 826 in synchronization with the timing signal output to the timing generator 833.

  FIG. 9 is an explanatory diagram of the two-dimensional RGB sensor 832, and outputs RGB information at positions divided into 8 × 8 to the control unit 826 in accordance with a timing signal output from the timing generator 833. The control unit 826 performs an operation according to the liquid crystal diaphragm operation described in the first embodiment in accordance with the zoom function / shift function or the interchangeable lens of the projection lens of the liquid crystal projector device, that is, FIG. 6 or FIG. The projection light correction calculation is performed using the two-dimensional RGB sensor information corresponding to the position sensed in the operation explanatory diagram of the liquid crystal diaphragm described in FIG.

DESCRIPTION OF SYMBOLS 1 ... Digital RGB input terminal, 2 ... Analog RGB input terminal, 3 ... Video input terminal, 4 ... Receiver, 5, 6 ... Analog-digital conversion circuit, 7 ... Video decoder, 8 ... Matrix circuit, 9 ... Input selector circuit, 10 DESCRIPTION OF SYMBOLS ... Frame memory, 11 ... Resolution conversion circuit, 12 ... Image processing circuit, 13 ... Inverse VT correction circuit, 14 ... Unevenness correction circuit, 15 ... Panel output processing circuit, 16 ... Power supply, 17 ... Lamp drive circuit (ballast) , 18 ... lamp, 19 ... integrator optical system, 20 ... liquid crystal panel, 21 ... projection lens, 22 ... screen, 23 ... remote control light receiving unit, 24 ... PC communication terminal, 25 ... control button, 26 ... control unit, 27 ... synchronization Signal input terminal 28... Synchronization processing circuit 29. Color correction processing circuit 30. Diaphragm 31. Condensing lens 32. RGB sensor 801: Digital RGB input terminal, 802 ... Analog RGB input terminal, 803 ... Video input terminal, 804 ... Receiver, 805, 806 ... Analog to digital conversion circuit, 807 ... Video decoder, 808 ... Matrix circuit, 809 ... Input selector circuit, 810 ... Frame memory, 811 ... Resolution conversion circuit, 812 ... Image processing circuit, 813 ... Inverse VT correction circuit, 814 ... Unevenness correction circuit, 815 ... Panel output processing circuit, 816 ... Power supply, 817 ... Lamp drive circuit (ballast) , 818 ... Lamp, 819 ... Integrator optical system, 820 ... Liquid crystal panel, 821 ... Projection lens, 822 ... Screen, 823 ... Remote control light receiving part, 824 ... PC communication terminal, 825 ... Control button, 826 ... Control part, 827 ... Synchronization Signal input terminal, 828 ... synchronization processing circuit, 829 ... color complement Processing circuit, 830 ... aperture, 831 ... condenser lens, 832 ... two-dimensional RGB sensor, 833 ... timing generator.

Claims (4)

Based on the RGB image signal input from the input means, the light emitted from the lamp as the light source is generated by controlling the spatial light modulator with the RGB image signal, and the two-dimensional image is generated on the screen surface. A projector device capable of projecting and forming a light image,
The projector device has a zoom function capable of changing the size of the projected two-dimensional image, an optical shift function capable of changing the position of the projected two-dimensional image, or an RGB image signal and a spatial light modulation element. An electric control shift function that can change the position of the two-dimensional image by changing the position of, or an interchangeable optical system that can change the optical system for imaging on the screen,
And an optical sensor for sensing the amount of light incident from the screen surface,
The optical sensor has a sensing area variable function that allows the sensing area to be changed,
The size of the projection image changed according to the zoom function, the position of the projection image according to the optical shift function or the electric control shift function, or the projection image changed according to the interchangeable optical system The sensing area of the optical sensor can be controlled to correspond to the size / position,
An image display apparatus that controls to correct a color of a screen surface in accordance with the output of the optical sensor. The image display apparatus according to claim 1, wherein the sensing area variable mechanism is a liquid crystal diaphragm capable of controlling a light collection area of the photosensor. The sensing area variable mechanism is a liquid crystal diaphragm capable of controlling a light condensing area of the photosensor, wherein the sensing area is changed by independently transmitting or blocking light in a plurality of areas in a two-dimensional direction. The image display device according to claim 2. Based on the RGB image signal input from the input means, the light emitted from the lamp as the light source is generated by controlling the spatial light modulator with the RGB image signal, and the two-dimensional image is generated on the screen surface. A projector device capable of projecting and forming a light image,
The projector device has a zoom function capable of changing the size of the projected two-dimensional image, an optical shift function capable of changing the position of the projected two-dimensional image, or an RGB image signal and a spatial light modulation element. An electric control shift function that can change the position of the two-dimensional image by changing the position of, or an interchangeable optical system that can change the optical system for imaging on the screen,
And a two-dimensional optical sensor that senses the amount of light at horizontal and vertical positions incident from the screen surface,
The size of the projection image changed according to the zoom function, the position of the projection image according to the optical shift function or the electric control shift function, or the projection image changed according to the interchangeable optical system An image display apparatus, wherein control is performed so as to correct a color of a screen surface in accordance with a sensor output at a predetermined position of the two-dimensional photosensor corresponding to a size / position.