JP2005323389A - Projection-type image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the ease of viewing a menu screen, when the menu is displayed on the screen so as to facilitate the adjustment of trapezoidal distortion correction. <P>SOLUTION: This projection-type image display device is provided with an image converting part 5 for converting an input image into trapezoidal distortion corrected image at least in either of the vertical direction or the horizontal direction and outputting it to image display devices 9r to 9b; an OSD part 53 for generating a menu screen guiding image adjustment; an image compositing part 54 for superimposing the menu screen to display images of the image display devices 9r to 9b; and a control part 56 for controlling the OSD part 53 and the image compositing part 54 and changing the position of the menu screen in the display image so that the menu screen lies in the image after the trapezoidal-distortion correction on the display screen. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  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.

  For example, a projection-type image display apparatus 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 each display image is overlaid on a screen provided outside by light from the light source to form one color projection image as a whole.

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 by using the function of the scan converter, and the trapezoidal distortion (hereinafter referred to as a vertical trapezoid) of the projected image when projected obliquely from below the screen surface. It has a function to correct distortion.

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.

  Such trapezoidal distortion correction in the vertical direction is a process for each line, and therefore image (pixel count) conversion is relatively easy.

In recent years, when a projection type image display apparatus is used for home use, a function for correcting a trapezoidal distortion in a 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.

  The horizontal keystone distortion correction will be described in detail later, but unlike the vertical keystone distortion correction, the number of pixels conversion process is complicated due to the necessity of performing interpolation processing using image information across multiple lines. Is not realized in the product.

The horizontal keystone 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.

If this trapezoidal distortion correction item is added to the menu screen image quality adjustment guidance used in many consumer or professional visual products, the trapezoidal distortion correction changes the screen size. The adjustment efficiency is better when the final screen size is adjusted to the maximum with respect to the screen after the correction is roughly performed.
However, in this case, a part of the projected image before the trapezoidal distortion correction sometimes protrudes from the screen, and in this state, there is a problem that characters on the menu screen may be difficult to read.

  The problem to be solved by the present invention is suitable, for example, when a menu is displayed on a screen to facilitate adjustment of keystone correction, and is provided with a new function that improves the visibility of the menu screen. An object of the present invention is to provide a type image display device.

  A projection-type image display apparatus according to the present invention is a projection-type image processing apparatus that projects a display image displayed on an image display device to the outside using light, and the input image is trapezoidal in at least one of a horizontal direction and a vertical direction. An image conversion unit that converts the image into a distortion-corrected image and outputs the image to the image display device; an OSD unit that generates a menu screen for guiding image adjustment; an image composition unit that overlays the menu screen on the display image; A control unit that controls the OSD unit and / or the image synthesis unit to change the position in the display image of the menu screen so that the menu screen is in the image after the keystone correction on the display screen. .

In the present invention, it is preferable that the control unit controls the change of the display screen position of the menu screen in accordance with the direction and correction amount of the trapezoidal distortion correction from the image conversion unit.
In the present invention, it is preferable to further include an operation unit for adjusting an image on the menu screen, and the control unit controls a change in a display screen position of the menu screen in accordance with an operation of the operation unit. .
In the present invention, the control unit preferably changes the position in the display screen of the menu screen from a fixed position in the center of the display image to a position closer to any of the four corners.
In the present invention, the position in the display image where the position of the menu screen can be changed is preferably determined in advance according to the offset direction of the optical component of the image display device with respect to the optical axis at the time of projection.

When the projection type image display apparatus is used, in the case of adjustment in which the projection image changes, for example, trapezoidal distortion correction, the user first projects the screen on the screen for the time being. At that time, part of the projected image may protrude from the screen due to trapezoidal distortion. At this time, it is necessary to correct the trapezoidal distortion by displaying a menu, but even the menu screen may protrude from the screen. In this case, the keystone distortion is corrected after the position of the menu screen is changed by button operation or the like so as to fit within the screen. Thereafter, the overall image size is changed to a desired size.
If the display position of the menu is linked to the trapezoidal distortion correction amount, the menu screen is immediately moved to a position that is easy to see just by correcting the keystone distortion.

  On the other hand, in the conventional projection type image display device without the function of adjusting the position of the menu screen, there is a procedure for temporarily shifting the projection direction left and right or up and down so that the menu screen fits on the screen, or reducing the overall image size. Necessary. Otherwise, the menu characters are difficult to read. Then, in the same manner as described above, the keystone distortion is corrected according to the menu display, and finally, the entire image size is set to a desired size.

In the projection type image display apparatus of the present invention, the display position of the menu can be changed simply by performing a button operation or automatically in conjunction with the trapezoidal distortion correction.
Note that there are various ways of utilizing the menu display position change regardless of the trapezoidal distortion correction procedure, such as making it easier to see characters by displaying them at a position with less distortion.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type image display apparatus provided with the new function which makes character determination of a menu screen easy can be provided. This function is convenient because the display position of the menu can be changed easily or automatically when the projected image size changes before and after adjustment, for example, keystone correction, and the menu screen protrudes from the screen, for example. It is.

[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.

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.

  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 processor 2 are synchronized through a switching circuit (not shown), and one of them (hereinafter, referred to as “color video signals R, G, B”). Simply referred to as RGB signals) is input to the ADC 4.

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.

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.

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.

  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.

  The scaler 52 corresponds to the “image conversion unit” of the present invention. The scaler 52 includes an H scaler that performs horizontal trapezoidal 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.

  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.

  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.

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.

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.

  Next, trapezoidal distortion correction in the vertical and horizontal directions performed by operating these buttons and keys will be described.

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 quadrangle, and there is no need for keystone 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.

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.

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.

The screen image has a different distortion rate between the downward projection and the upward projection. This is because, in home use, in consideration of the fact that the screen is often arranged higher than the setting position of the projector 1, the optical component such as a lens of the fixed pixel display device has its optical axis below the light source and the panel. This is because they are arranged with an offset 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.

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.

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 ratio 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.

Next, horizontal keystone distortion correction will be described.
As shown in FIG. 7A, when the projector 1 is placed in front of a 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.

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. .

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.

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.

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.

Next, an external operation when performing the 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.

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 correction, depending on whether the projection is downward or upward, in the case of horizontal keystone 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.

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.

  Note that the menu item of 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 when the power is turned on next time. The same trapezoidal distortion correction as before is executed.

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.

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.
If it is difficult to operate the menu when it is difficult to see the menu itself, this menu position change may be operated with a button provided on the body or the remote control.

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 users to correct keystone distortion. As a result, this projector has become a user-friendly product. It is finished.

[Second Embodiment]
In this embodiment, the “menu position” is changed automatically.

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.

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.

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 position M1 on the side.

  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.

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.
Note that the menu change position is limited to M1 and M2 in this example because, as described in the first embodiment, there is little distortion on the lower side of the screen due to the relationship with 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.

  Such automatic change of the “menu position” effectively prevents the menu screen from protruding the corrected image display area.

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. It is a block diagram which shows the principal part structure of the image conversion process part of the projector which concerns on embodiment of this invention. 1 is an external view of a projector according to an embodiment of the present invention and a remote control terminal thereof. It is a figure when the projector which concerns on embodiment of this invention projects from the position (A), (B), (C) which differs in the orthogonal | vertical direction with respect to a screen. (A-1) to (C-3) are screen images before and after vertical trapezoid correction and a device display image at the time of correction in the projector according to the embodiment of the present invention. It is a figure shown about each of these. (A), (B) is a figure which shows typically the image data used in order to demonstrate distortion correction of the perpendicular direction with the projector which concerns on embodiment of this invention. It is the figure which projected the projector which concerns on embodiment of this invention from the position (A), (B), (C) which differs in a horizontal direction with respect to a screen. (A-1) to (C-3) are screen images before and after horizontal keystone correction and a device display image at the time of correction in the projector according to the embodiment of the present invention. It is a figure shown about each of these. (A), (B) is a figure which shows typically the image data used in order to demonstrate distortion correction of a horizontal direction with the projector which concerns on embodiment of this invention. It is a figure which shows the menu screen at the time of trapezoid correction direction setting with the projector which concerns on embodiment of this invention. (A), (B) is explanatory drawing which shows the necessity of a menu screen position change, and a changeable position with the projector which concerns on embodiment of this invention. It is a figure which shows the screen at the time of menu position setting with the projector which concerns on embodiment of this invention. It is a flowchart which shows the process sequence in the menu position automatic change mode with the projector which concerns on 2nd Embodiment of this 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,
An input image is converted into an image that has been corrected for trapezoidal distortion in at least one of the horizontal direction and the vertical direction, and output to the image display device; and
An OSD unit that generates a menu screen for guiding image adjustment;
An image composition unit for superimposing the menu screen on the display image;
A control unit that controls the OSD unit and / or the image composition unit so that the menu screen is in the image after the trapezoidal distortion correction on the display screen, and changes the position in the display image of the menu screen;
A projection-type image display device. The projection-type image display device according to claim 1, wherein the control unit controls the change in the display screen position of the menu screen in accordance with the direction and correction amount of the trapezoidal distortion correction from the image conversion unit. It further has an operation means for image adjustment on the menu screen,
The projection type image display apparatus according to claim 1, wherein the control unit controls a change in a display screen position of the menu screen according to an operation of the operation unit. The projection type image display device according to claim 1, wherein the control unit changes a position in the display screen of the menu screen from a fixed position in the center of the display image to a position closer to any of the four corners. The projection image display apparatus according to claim 1, wherein the position in the display image where the position of the menu screen can be changed is predetermined according to an offset direction of an optical component of the image display device with respect to the optical axis at the time of projection. .

Images