JP3700623B2 - Projection-type image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes, for example, an image display device having a discrete pixel (fixed pixel) structure typified by LCD (Liquid Crystal Display), and projects the display image to the outside by light from a light source. The present invention relates to an image display device.
[0002]
[Prior art]
For example, a projection-type image display device having a discrete pixel structure such as an LCD includes a light source and an image display device (LCD or the like) that displays an image projected by the light source. An image display device is provided for each of R, G, and B, and the respective display images are superimposed on a screen provided outside by light from the light source to form one color projection image as a whole.
[0003]
In general, a projection type image display apparatus has an image conversion means (scan converter) that converts the number of pixels by signal processing because the input signal may differ from the number of pixels in the vertical and horizontal directions of the image display device. .
Many projection-type image display devices are called so-called launches using the function of this scan converter, and the trapezoidal distortion (hereinafter referred to as a vertical trapezoid) of the projected image when projected from obliquely below the screen surface. It has a function to correct distortion.
[0004]
With vertical trapezoidal distortion correction, the display image on the image display device is intentionally distorted in the opposite direction to the trapezoidal distortion of the projected image on the screen, and as a result, the projected image on the screen becomes a clean rectangle. .
In order to intentionally distort the display image on the image display device into a trapezoidal shape, in the signal processing at the previous stage, a process of gradually increasing the compression rate in one direction for each line is performed using a scan converter. For example, to correct an inverted trapezoidal distortion image that is a projected image on the screen and has a long upper side and a short lower side, the line corresponding to the upper side of the projected image has the highest compression ratio on the display image of the display image device. However, as the distance from the line increases, the compression rate of the line gradually decreases.
In this case, for example, according to a predetermined rule that guarantees linearity in the projected image on the screen, the scan converter synthesizes a new pixel having a plurality of pieces of pixel information by interpolation processing to guarantee a natural image with high linearity. While reducing the number of pixels.
[0005]
Such trapezoidal distortion correction in the vertical direction is a process for each line, and therefore image (pixel number) conversion is relatively easy.
[0006]
[Problems to be solved by the invention]
In recent years, when a projection type image display apparatus is used for home use, a function to correct a trapezoidal distortion in the horizontal direction (horizontal direction) to some extent has been required.
This gives freedom to the horizontal positional relationship between the user viewing in front of the screen and the projection-type image display device, and projects the image of the projection-type image display device obliquely to the screen surface. This is to make it possible.
[0007]
However, horizontal trapezoidal distortion correction is described in detail later, but unlike vertical keystone distortion correction, the number of pixels conversion process is complicated due to the necessity of performing interpolation processing using image information that spans multiple lines. Not realized in the actual product.
[0008]
The horizontal trapezoidal distortion correction can be realized in principle from the function of the scan converter. However, if this correction is applied to a home use projection type image display device, if both vertical and horizontal trapezoidal distortions must be corrected, the adjustment procedure becomes complicated and user-friendly. I encountered a major obstacle to commercialization.
This is one of the factors that a product having a trapezoidal distortion correction function in two directions, vertical and horizontal, has not been realized.
[0010]
  The present inventionPurpose ofAn object of the present invention is to provide a projection-type image display apparatus that can independently correct trapezoidal distortion in two directions, vertical and horizontal, and that can be easily adjusted.
[0011]
[Means for Solving the Problems]
According to the present inventionProjection type image display deviceA projection type image processing apparatus for projecting a display image displayed on an image display device to the outside by light, a first operation means capable of increasing or decreasing a correction amount of trapezoidal distortion in two directions of a horizontal direction and a vertical direction; A second operating means capable of increasing or decreasing the correction amount of the trapezoidal distortion in the horizontal direction, and when the first operating means is operated, the trapezoidal distortion in the horizontal direction and the vertical direction of the input image in the correction direction according to the operation; The first image conversion processing is independently performed at each predetermined correction step, and when the second operation means is operated, the trapezoidal distortion of the horizontal input image is expressed in units of a predetermined multiple of the correction step. And an image conversion unit that performs a second image conversion process for changing the image and outputs the converted image to the image display device.
[0012]
  In the present invention,Preferably, it further includes an OSD unit that generates a menu screen for guiding various image adjustments including correction of trapezoidal distortion, and an image composition unit that superimposes the menu screen on the converted image. The trapezoidal distortion correction amount can be changed on the menu screen according to the operation, and the trapezoidal distortion correction amount can be changed according to the operation of the second operation means regardless of the display of the menu screen. is there.
In the present invention, more preferably, when the second operation unit is operated during display of the menu screen, the image conversion unit performs the second image conversion process according to the operation of the second operation unit, The first image conversion process corresponding to the operation of the first operation means on the menu screen is prioritized and executed.
[0013]
Preferably, the present invention further includes a holding circuit that holds the correction amount for each correction direction until the next operation of the first operation means or the second operation means is performed, and the second operation means operates the operation. When it is, the vertical trapezoidal distortion correction amount in the holding circuit is fixed to the value at the time of the operation, and the horizontal trapezoidal distortion correction amount according to the operation of the second operating means is held. The second image conversion process is performed by rewriting the circuit.
Alternatively, preferably, a correction circuit further includes a holding circuit that holds the correction amount for each correction direction until the next operation of the first operation unit or the second operation unit is performed, and the second operation unit is operated. Returns the correction amount of the trapezoidal distortion in the vertical direction in the holding circuit to zero, and rewrites the holding circuit with the correction amount of the trapezoidal distortion in the horizontal direction according to the operation of the second operation means, thereby rewriting the second image. Perform the conversion process.
[0014]
Of the above configurationProjection type image display deviceIn addition to the first operation means that can increase or decrease the correction amount of the trapezoidal distortion in two directions, horizontal and vertical,For example, direct buttonAnd second operation means capable of increasing or decreasing the correction amount of the trapezoidal distortion in the horizontal direction.
According to a preferred configuration, when the second operation means is operated when the menu screen is displayed, processing according to the operation by the second operation means is executed in preference to the processing according to the operation by the first operation means. Is done.
According to another preferred configuration, the second operating meansIs manipulated,The image conversion unitDirect keystone distortionThe correction amount ofFixed and horizontal trapezoidal distortionCorrection amountStep by step, for exampleUsing the predetermined correction amount as a unitPredetermined predetermined magnification such as ± 10 times stepInCan be switched.
  Generally, even if the trapezoidal distortion in the vertical direction remains, there is not much sense of incongruity, but if there is a trapezoidal distortion in the horizontal direction, the projected image has a sense of incongruity and it is difficult to see the image. A general user can easily reach an image that can withstand viewing only by operating the direct button once or a plurality of times while viewing the projected image.
  Thereafter, a user who requests fine distortion correction may open the menu screen and adjust the horizontal and vertical trapezoidal distortions independently according to the display.
[0015]
In addition, there is a case where the position of the projection type image display apparatus is desired to be shifted laterally after adjustment. In this case, the user further corrects the trapezoidal distortion in the horizontal direction. In this case, the adjustment can be performed only by operating the direct button. This is because the operation by the external operation means can be performed in preference to the operation on the menu screen.
[0016]
In the present invention, it is possible to adjust in accordance with the user's request to obtain an image that can withstand viewing in this way, and many of them can be adjusted only by operating the external operation means. Moreover, it conforms to the actual situation at the time of use of the product that most of the readjustment after the adjustment is the trapezoidal distortion correction in the horizontal direction.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
First embodiment
FIG. 1 is a block diagram showing a schematic configuration of a projection type image display apparatus (hereinafter simply referred to as a projector) according to an embodiment of the present invention.
The projector 1 includes a video signal processing unit 2, a synchronization signal processing unit 3, an analog-digital converter (ADC) 4, an image conversion processing unit 5, a gamma correction unit (3D γ circuit) 6, a panel driving unit 7, and overall control. A central processing unit (CPU) 8 and fixed pixel display panels 9r, 9g, and 9b for each of R, G, and B.
When the panel is an analog signal drive such as an LCD, a digital-analog converter (DAC) is built in the panel drive unit 7.
[0024]
The video signal processing unit 2 includes a chroma decoder, a matrix circuit, and other various filters that make the screen high resolution or low noise.
A video signal is input to the video signal processing unit 2. A chroma signal included in the input video signal is converted into a color difference signal by a chroma decoder, and is converted into an R, G, B color signal by a matrix circuit together with a luminance signal included in the video signal. In the process, high resolution and various filtering processes are performed. The video signal processing unit 1 outputs processed color video signals R, G, and B.
[0025]
The sync signal processing unit 3 receives R, G, B computer signals, a horizontal sync signal HS, and a vertical sync signal VS. The computer signal is subjected to various synchronization processes based on the synchronization signals HS and VS, and is output from the synchronization signal processing unit 3. The color computer signals R, G, and B and the color video signals R, G, and B output from the video signal processing unit 2 are synchronized through a switching circuit (not shown), and one of them (hereinafter, referred to as “color computer signals R, G, B”) Simply referred to as RGB signals) is input to the ADC 4.
[0026]
The ADC 4 includes a phase-locked loop (PLL) circuit that generates a clock synchronized with a signal from the synchronization signal processing circuit. This clock is called a memory clock and is a clock synchronized with the image signal.
The ADC 4 converts the input analog RGB signal into a digital RGB signal in synchronization with the memory clock and outputs the digital RGB signal. The ADC 4 also outputs a memory clock MCLK.
[0027]
Although the details will be described later, the image conversion processing unit 5 performs pixel number conversion processing such as trapezoidal distortion correction and aspect ratio conversion on RGB signals that have undergone necessary processing such as I / P conversion (not shown). .
Further, the image conversion processing unit 5 includes an oscillation circuit that generates a clock DCLK called a display clock. A stage subsequent to the image memory in the image conversion processing unit 5 operates in synchronization with the display clock DCLK.
The RGB signal after the image conversion process is converted into a panel drive signal by the panel drive unit 7 after the gain is adjusted by the 3D γ circuit 6. This panel drive signal is used as a signal for driving the R, G, B panels 9r, 9g, 9b.
The operation of each unit described above is controlled by the CPU 8.
[0028]
FIG. 2 is a block diagram illustrating a main configuration of the image conversion processing unit.
The image conversion processing unit 5 includes a frame memory 51, a scaler 52, an on-screen display (OSD) unit 53, an image composition unit 54, a control unit 55, a central processing unit (CPU) 56 that performs control related to image conversion, and control related to a user interface. A central processing unit (UI.CPU) 57 for performing
The control unit 55 may be distributed in the frame memory 51, the scaler 52, and the OSD unit 53. Each of the control unit 55, the frame memory 51, the scaler 52, and the OSD unit 53 includes a register Re.
[0029]
A digital RGB signal subjected to predetermined signal processing, for example, I / P conversion processing, is input to the frame memory 51, and the RGB signal is accumulated for each frame under the control of the control circuit 55 and the CPU 56.
[0030]
The scaler 52 corresponds to the “image conversion unit” of the present invention. The scaler 52 includes an H scaler that performs horizontal keystone distortion correction and a V scaler that performs vertical keystone distortion correction. The two scalers appropriately read out necessary pixel information from the frame memory 51 under the control of the control circuit 55 and the CPU 56, and independently perform the trapezoidal distortion correction in the horizontal direction and the trapezoidal distortion correction in the vertical direction.
[0031]
The OSD unit 53 reads a menu screen for guiding various image adjustments from the built-in image memory, and changes the numerical value and the pointer position. The menu screen has a hierarchical structure, and a menu screen that is actually displayed is selected according to a user operation.
[0032]
The image synthesizing unit 54 performs image synthesis for displaying the selected menu screen so as to be superimposed on an image formed by RGB signals obtained by performing various signal processing on video signals or computer signals. The RGB signal after the image composition processing is output to the 3D γ circuit 6 of FIG.
[0033]
The frame memory 51, scaler 52, OSD unit 53, image composition unit 54, and control circuit 55 for controlling image conversion are all controlled by the CPU 56.
Note that the user interface CPU 57 and the CPU 56 may be constituted by one CPU.
[0034]
FIG. 3 is an external view of the projector and its remote control terminal (hereinafter abbreviated as “remote control”).
A direct button 11 and a pointer movement key 13 are disposed on the operation panel 10 of the projector 1. The direct button 11 is a button for coarse adjustment of, for example, horizontal keystone distortion correction, and forms one form of the “external operation means” of the present invention. The direct button 11 and the pointer movement key 13 together with the UI. It is electrically connected to the CPU 57.
When the projector 1 has the remote control 12 as equipment, it is desirable to provide the direct button 11 and the pointer movement key 13 also on the remote control 12 side as shown in the figure.
[0035]
Next, vertical and horizontal trapezoidal distortion correction performed by operating these buttons and keys will be described.
[0036]
First, the trapezoidal distortion correction in the vertical direction will be described.
As shown in FIG. 4A, when the projector 1 is placed in the center with respect to the screen 200 that displays an image, the projected image (hereinafter referred to as a screen image) is beautiful as shown in FIG. It becomes a square and there is no need for trapezoidal distortion correction. At this time, as shown in FIG. 5A-2, the image of the panel surface 90 of the fixed pixel display device viewed from the light source side, that is, toward the screen is also a beautiful rectangle. Hereinafter, the device display image refers to an image on the panel surface 90 of the device viewed from the light source side toward the screen unless otherwise specified.
[0037]
However, in the case of FIG. 4B in which the projector 1 is projected from below on the screen 200, the screen image causes an inverted trapezoidal distortion whose lower side is shorter than the upper side, as shown in FIG. 5B-1.
On the contrary, in the case of FIG. 4C in which the projector 1 is projected on the screen 200 from above, as shown in FIG. 5C-1, the screen image has a trapezoidal distortion whose upper side is shorter than the lower side.
[0038]
In the trapezoidal distortion correction, the device display image is intentionally distorted contrary to the trapezoidal distortion on the screen.
That is, in the case of projection from below, it is distorted into a trapezoid as shown in FIG. In the case of projection from above, it is distorted into an inverted trapezoid as shown in FIG.
The distortion correction rate on these device display images is determined by the ratio of the long side to the short side of the trapezoid projected on the panel surface 90 of the device. When this distortion correction rate is adapted to the distortion rate on the screen, a beautiful rectangular screen image can be obtained as shown in FIGS.
[0039]
The screen image has a different distortion rate between the downward projection and the upward projection. This is because, in home use, considering that the screen is often arranged higher than the setting position of the projector 1, the optical axis of the optical component such as a lens of the fixed pixel display device is offset downward with respect to the light source and the panel. This is because they are arranged so that they are not easily distorted during projection.
In addition, the device display image has a space with a width corresponding to the distortion rate between its short side and the edge of the panel surface. This is because the aspect ratio of the screen image after correction is adjusted to the aspect ratio of the original image. It is to make it the same. Therefore, the size of the screen image after correction varies, but this is dealt with by adjusting the projection magnification so that the user has a preferred image size.
[0040]
This vertical distortion correction method will be briefly described by taking the case of FIG. 5C-2 as an example.
6A and 6B schematically show image data for one frame and one line.
Here, attention is paid to the line L along the lower side of the trapezoid in the frame. The image data of the line L0 corresponding to the line L is read from the frame memory 51 storing the original image data to the V scaler, and the compressed image data is generated by performing interpolation processing while ensuring linearity. That is, the number of pixels is reduced while making the image look the same. A new line L is generated by setting the pixels in the left and right regions of the image data generated by this compression to black.
[0041]
A trapezoidal device display image is generated by performing such pixel number conversion processing for each line on all the lines while gradually changing the compression rate.
This pixel number conversion process is performed by the CPU 56 changing and controlling the compression rate stored in the register Re built in the control circuit 55, for example.
The compression rate once set is stored in the register Re in the scaler 52, and can be used every time the number of pixels of the V scaler is changed until the register Re is rewritten next time. Therefore, for example, until the user operates the vertical distortion correction rate from the outside and the CPU updates the register contents in the scaler 52, the same distortion correction is repeated in the vertical direction even if the power is turned off. It is possible to set a simple processing procedure. This setting is performed by turning on a “trapezoid correction memory” on a menu screen described later.
[0042]
Next, horizontal trapezoidal distortion correction will be described.
As shown in FIG. 7A, when the projector 1 is arranged in front of the screen 200 that displays an image, the screen image becomes a beautiful rectangle as shown in FIG. There is no need. At this time, as shown in FIG. 8A-2, the device display image on the panel surface 90 viewed from the light source side is also a beautiful rectangle.
[0043]
However, in the case of FIG. 7B in which the projector 1 is projected on the screen 200 from the left side, the screen image is distorted in a horizontal trapezoidal shape whose left side is shorter than the right side, as shown in FIG.
Conversely, in the case of FIG. 7C in which the projector 1 is projected on the screen 200 from the right side, the screen image has a horizontal trapezoidal distortion whose right side is shorter than the left side, as shown in FIG. 8C-1. .
[0044]
In the trapezoidal distortion correction, the device display image is intentionally distorted contrary to the trapezoidal distortion on the screen.
That is, in the case of projection from the left side, it is distorted into a trapezoidal shape shown in FIG. Further, in the case of projection from the right side, it is distorted into a trapezoidal shape as shown in FIG.
The distortion correction rate on these device display images is determined by the ratio of the long side to the short side of the trapezoid projected on the panel surface 90 of the device. When this distortion correction rate is adapted to the distortion rate on the screen, a beautiful rectangular screen image can be obtained as shown in FIGS.
[0045]
This horizontal distortion correction method will be briefly described by taking the case of FIG. 8C-2 as an example.
FIG. 9A schematically shows image data for one frame. FIG. 9B is an explanatory diagram when one line of image data is generated using a plurality of lines of original image data.
Note the line L that intersects the hypotenuse of the trapezoid in the frame. A new pixel P1 is generated by interpolation processing using the first two lines L01 and L02 of the original image data at a location along the hypotenuse of the trapezoid in the line L. Further, in order to generate the pixel P2 that is separated from the hypotenuse of the trapezoid, an interpolation process using two intermediate lines L0i and L0i + 1 is performed. As described above, in the trapezoidal distortion correction in the horizontal direction, a plurality of lines are used to generate one line. For this reason, it is desirable to provide a buffer area in the frame memory 51 and extract the original image data of necessary lines in advance. Then, a new line L is generated by setting the pixels in the right region of the new image data to black.
[0046]
The line combination and interpolation processing rules are parameters that change according to the distortion correction rate. A trapezoidal device display image is generated by performing such pixel number conversion processing for each line for all the lines while gradually changing the parameters.
This pixel number conversion process is performed by the CPU 56 changing and controlling a parameter stored in a register Re built in the control circuit 55, for example.
The parameter once set is stored in the register Re in the scaler 52 and can be used every time the number of pixels of the H scaler is changed until the register is rewritten next time. For example, the same distortion correction can be maintained in the vertical direction even if the power is turned off until the user operates the horizontal distortion correction rate from the outside and the CPU updates the contents of the register Re in the scaler 52. It becomes possible to do. This setting is performed by turning on a “trapezoid correction memory” on a menu screen described later.
[0047]
Next, an external operation when performing this trapezoidal distortion correction will be described.
FIG. 10 shows an example of a menu screen during keystone distortion correction.
When the user presses a “menu” button (not shown) provided on the body of the projector 1 or the remote controller 12, the UI. The CPU 57 calls the “initial screen” of the menu stored in the OSD unit 53, and the image composition unit 54 composes it and displays it on the projection image. The user selects some items in the menu using the pointer movement key 13. Here, the fourth “installation setting” item is selected. The UI that received the instruction. The CPU 57 calls the “installation setting screen” of the menu stored in the OSD unit 53 and displays it on the projected image by image composition.
The user selects “trapezoid correction direction” from the items of the “installation setting screen” shown in FIG. 10 and appears at that time, and selects “horizontal” or “vertical” in the pop-up menu to determine the trapezoidal distortion direction. Further, the user selects “digital trapezoid correction” above it and gives an instruction to shift to the adjustment screen.
[0048]
Then, for example, the menu screen disappears, and a small display window showing a display value of the correction amount proportional to the trapezoidal correction factor appears. The display value of the correction amount has a value within a range of ± 120, for example, and is changed step by step by operating the pointer movement key 13.
In the case of vertical keystone distortion correction, depending on whether the projection is downward or upward projection, in the case of horizontal keystone distortion correction, the correction value is displayed in a positive direction depending on whether the projection is from the left or right side. It is decided whether to change or to change in the negative direction.
The user changes the correction amount by operating the pointer movement key 13 while viewing the screen image, and stops the operation when determining that the screen has become a beautiful square. After that, when the screen size is adjusted or the focus is finely adjusted, the “installation setting” is completed.
[0049]
As described above, the projector 1 according to the present embodiment includes the direct button 11 as an external operation unit in the body and the remote controller 12. The direct button 11 includes a plus key 11a and a minus key 11b.
The direct button 11 is a button for changing the above-described correction amount display value in a predetermined large step such as ± 10 steps. Moreover, the operation of the direct button 11 can be performed at any time regardless of the display of the menu screen, and the direction of trapezoidal distortion correction is limited to one of the horizontal direction and the vertical direction. Normally, the projector position does not move much in the height direction, but in the horizontal direction, there is a situation that it is relatively frequently performed because it obstructs viewing. In view of this situation, in the projector of this example, rough adjustment of the correction amount in the horizontal direction can be quickly performed by direct button operation.
When the direct button 11 is operated, other vertical correction amounts are fixed at the immediately preceding stage or are forced to return to zero. Further, the operation of the direct button 11 is prioritized over the operation on the menu screen.
[0050]
Note that the menu item in FIG. 10 is “trapezoidal correction memory”. If this is set to “ON”, the keystone distortion correction parameters are saved even when the power is turned off, and automatically the next time the power is turned on. The same trapezoidal distortion correction as before is executed.
[0051]
Further, the menu item of FIG. 10 includes an item “menu position”. This is for selecting a function for moving the position of the menu screen at the center of the projected image at a fixed position to, for example, any one of the four corners.
For example, as shown in FIG. 11A, the menu screen at the center of the panel surface 90 partially protrudes from the corrected image display area, and when the image is projected at a magnification that fills the screen in this state, the menu screen is displayed. It will be difficult to read characters on the screen. This function is provided to avoid such a situation.
[0052]
When the menu position is selected, a pop-up menu appears as shown in FIG. At this time, if the pointer position at the “center” is set to “lower left”, the menu screen moves from the fixed position M0 in FIG. 11B to M1. If “lower right” is selected, the menu position moves to M2, if “upper left” is selected, the menu position moves to M3, and if “upper right” is selected, the menu position moves to M4.
If this function is used, the menu screen can be moved to the optimum position M1 in the example of FIG. This makes the screen easier to see and makes subsequent menu operations comfortable.
In consideration of the difficulty of menu operation when the menu itself is difficult to see, this menu position change may be operated with buttons provided on the body or the remote control.
[0053]
The projector 1 according to the present embodiment can perform horizontal keystone distortion correction in addition to vertical keystone distortion correction, and the degree of freedom of installation is greatly improved. In the external view shown in FIG. 3, the direction of the body can be changed in three dimensions with respect to the pedestal, so that the projection position can be easily changed.
In addition, the various functions such as “menu display”, “direct button”, and “menu position change” described above make it much easier for the user to correct keystone distortion. As a result, this projector becomes a user-friendly product. It is finished.
[0054]
Second embodiment
In this embodiment, the “menu position” is changed automatically.
[0055]
FIG. 13 is a flowchart showing a processing procedure in the “menu position” automatic change mode.
The determination and menu position setting in this flowchart are all performed in the UI. The result is executed by the CPU 57 or the CPU 56, and the result is stored in the register Re in the OSD unit 53.
[0056]
First, in step ST11, it is examined whether or not the trapezoidal distortion correction amount Kh in the horizontal direction is within a range larger than −70 and smaller than 70.
If this determination is “Yes”, since the amount of correction in the horizontal direction is small, the menu screen does not protrude from the corrected image display area, and in step ST21, the center menu position M0 in FIG. maintain.
[0057]
If "No" is determined in step ST11, the process proceeds to step ST12, where it is checked whether or not the correction amount Kh is within a range of -120 or more and -70 or less.
When this determination is “Yes”, it is assumed that the projection is from a position far left from the center as shown in FIG. 7B, and in step ST22, the menu position is changed from the fixed position of M0 to the lower left in FIG. 11B. The position is changed to the side position M1.
[0058]
If “No” is determined in step ST12, the process proceeds to step ST23, the correction amount Kh is within the range of 70 to 120, and is projected from the position largely to the right as shown in FIG. 7C. As a result, the menu position is changed from the fixed position of M0 to the lower right position M2 in FIG.
[0059]
In addition to the maximum variation range of the correction amount Kh, the determination threshold values 70 and -70 are not limited to this, and can be freely changed depending on how the menu screen fits in the corrected image display area. be able to.
The menu position can be changed by deleting the menu change item on the menu screen and using only the automatic change mode, or by adding an automatic change mode in addition to the manual change function on the menu screen. The automatic change mode may be entered. Furthermore, an item “automatic menu position” may be newly provided as an item on the menu screen, and the automatic change mode may be given priority only when this item is “on”.
Furthermore, the menu positions M3 and M4 may be changed to four locations, or may be linked to vertical correction.
In this example, the menu change position is limited to M1 and M2 because, as described in the first embodiment, there is little distortion on the lower side of the screen in relation to the offset. In installation such as ceiling suspension, the places with less distortion often become the upper two places M3 and M4 on the screen, and in this case, the change places may be limited to the upper two places.
[0060]
Such automatic change of the “menu position” effectively prevents the menu screen from protruding the corrected image display area.
[0061]
【The invention's effect】
  Main departureClearlyAccording to the projection type image display apparatus, verticalas well asIt is possible to provide a projection type image display apparatus that can independently correct horizontal trapezoidal distortion in two directions and that can be easily adjusted.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a projection type image display apparatus (projector) according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a main configuration of an image conversion processing unit of the projector according to the embodiment of the invention.
FIG. 3 is an external view of a projector and its remote control terminal according to an embodiment of the present invention.
FIG. 4 is a diagram when the projector according to the embodiment of the present invention is projected from different positions (A), (B), and (C) in a direction perpendicular to the screen.
FIGS. 5A to 5C are perspective views of screen images before and after trapezoidal correction in the vertical direction and a device display image at the time of correction at the center in the projector according to the embodiment of the present invention. It is a figure shown about each of upper and lower.
FIGS. 6A and 6B are diagrams schematically illustrating image data used for explaining vertical distortion correction in the projector according to the embodiment of the present invention. FIGS.
FIG. 7 is a diagram in which the projector according to the embodiment of the present invention is projected from different positions (A), (B), and (C) in the horizontal direction with respect to the screen.
FIGS. 8A to 8C are perspective views of a screen image before and after horizontal trapezoid correction and a device display image at the time of correction in a projector according to an embodiment of the present invention, with projection positions in front. It is a figure shown about each of left, right.
FIGS. 9A and 9B are diagrams schematically showing image data used for explaining horizontal distortion correction in the projector according to the embodiment of the invention. FIGS.
FIG. 10 is a diagram showing a menu screen when a keystone correction direction is set in the projector according to the embodiment of the invention.
FIGS. 11A and 11B are explanatory diagrams showing necessity of changing the menu screen position and changeable positions in the projector according to the embodiment of the present invention. FIGS.
FIG. 12 is a diagram showing a screen when setting a menu position in the projector according to the embodiment of the invention.
FIG. 13 is a flowchart showing a processing procedure in a menu position automatic change mode in the projector according to the second embodiment of the invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector (projection type image display apparatus), 2 ... Video signal processing part, 3 ... Synchronization signal processing part, 4 ... ADC, 5 ... Image conversion part, 6 ... 3D gamma circuit, 7 ... Panel drive part, 9r, 9g, 9b ... Panel (image display device), 10 ... Operation panel, 11 ... Direct button (external operation means), 12 ... Remote control, 13 ... Pointer movement key, 51 ... Frame memory, 52 ... Scaler, 53 ... OSD section, 54 ... Image compositing unit, 55... Control circuit (control unit), 56, 57. CPU (control unit), 90 ... panel surface, 200 ... screen.

Claims (5)

A projection type image processing apparatus that projects a display image displayed on an image display device to the outside by light,
A first operation means capable of increasing or decreasing the correction amount of the trapezoidal distortion in two directions of a horizontal direction and a vertical direction;
A second operating means capable of increasing or decreasing the correction amount of the trapezoidal distortion in the horizontal direction;
When the first operation means is operated, a first image conversion process is performed in which the horizontal and vertical trapezoidal distortions of the input image are independently changed at predetermined correction steps in a correction direction corresponding to the operation. When the second operation means is operated, a second image conversion process is performed to change the trapezoidal distortion of the input image in the horizontal direction in units of a predetermined multiple of the correction step in the horizontal direction, and the converted image is processed. An image conversion unit for outputting to the image display device;
A projection-type image display device. An OSD unit for generating a menu screen for guiding various image adjustments including correction of trapezoidal distortion;
An image composition unit for superimposing a menu screen on the converted image,
The change of the trapezoidal distortion correction amount according to the operation of the first operation means can be executed on the menu screen, and the change of the trapezoidal distortion correction amount according to the operation of the second operation means is displayed on the menu screen. The projection type image display device according to claim 1, wherein the projection type image display device can be executed independently of each other. When the second operation unit is operated during display of the menu screen, the image conversion unit performs the second image conversion process according to the operation of the second operation unit on the menu screen. The projection type image display device according to claim 2, wherein the projection type image display device is executed in preference to the first image conversion process according to an operation of one operation means. A holding circuit that holds the correction amount for each correction direction until the next operation of the first operating means or the second operating means is next;
When the second operating means is operated, the correction amount of the trapezoidal distortion in the vertical direction in the holding circuit is fixed to the value at the time of the operation, and the horizontal trapezoid according to the operation of the second operating means The projection image display apparatus according to claim 1, wherein the second image conversion process is performed by rewriting the holding circuit with a distortion correction amount. A holding circuit that holds the correction amount for each correction direction until the next operation of the first operating means or the second operating means is next;
When the second operating means is operated, the vertical trapezoidal distortion correction amount in the holding circuit is returned to zero, and the horizontal trapezoidal distortion correction amount according to the operation of the second operating means is used. The projection image display apparatus according to claim 1, wherein the second image conversion process is performed by rewriting a holding circuit.

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