JP2006186675A - Triple-tube type projector device and convergence control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the adjustment of convergence by reducing differences in correction sensitivity of convergence caused by the positional relation between a screen and a projection tube. <P>SOLUTION: Point data, representing the convergence correction quantities of respective colors R, G, and B as to a plurality of adjustment points virtually arrayed as representative points on the screen 19, in advance, are stored to a memory 31, convergence correction data on pixels existing between adjustment points are calculated by an interpolative arithmetic section 35, based on the point data corresponding to the adjustment points to generate auxiliary deflection signals of R, G, and B based upon the respective convergence correction data, and the signals are sent to projection tubes 181, 182, and 183 of the corresponding colors to correct convergence on the screen 19. When adjustment mode of convergence is selected, a color and an adjustment point are designated, and a correction value that the point data indicate has increased or decreased, in adjustment steps predetermined corresponding to the position of the adjustment point to adjust a correction quantity for the convergence is adjusted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-tube projector device having a convergence adjustment function.

  As is well known, a rear projection type three-tube projector device projects an image of each color onto a screen from three projection tubes arranged in the order of red, green, and blue (hereinafter referred to as R, G, and B). A color image is obtained. The R projection tube and the B projection tube are arranged at a predetermined angle with respect to the G projection tube. For this reason, color misregistration occurs on the screen. Therefore, conventionally, color matching is performed by performing electromagnetic correction for each projection tube individually. A device that performs color matching by this auxiliary electromagnetic correction is a convergence device.

  A specific configuration related to the convergence device is disclosed in, for example, “Digital Convergence Device” in Patent Document 1. The apparatus described in this document arranges M × N adjustment points on a screen and stores convergence correction data corresponding to each adjustment point in a memory in advance. At the time of adjustment, using a plurality of adjustment point data read from the memory, interpolation data for filling between the adjustment points is created by an interpolation operation using a low-pass filter characteristic. Then, after the interpolation data is converted into an analog signal, current amplification is performed by an auxiliary deflection amplifier, which is supplied as a convergence correction signal to a convergence yoke attached to the picture tube neck. According to this configuration, color misregistration can be automatically improved only by the user instructing adjustment.

  However, in reality, the convergence is affected by a change in installation location and installation orientation, and a slight change in the television set mechanism, resulting in a color shift. As a countermeasure, a projector device has been provided that allows a user to adjust convergence by manual operation.

However, in the convergence adjustment unit by manual operation provided in the conventional projector apparatus, the amount of change in correction data per correction correction step is uniform regardless of the screen position and color. On the left and right sides of the screen, the correction sensitivity for R and B convergence is different, so one color has too high correction sensitivity and coarse adjustment accuracy. On the other hand, the other color has too low correction sensitivity, and it takes time to correct the convergence. There was a problem that it took.
Japanese Patent Laid-Open No. 7-212779

  The object of the present invention is to be able to adjust the amount of change in correction data per step of convergence correction according to the position or color of the screen, thereby making it possible to substantially equalize the correction correction sensitivity for each color on the left and right sides of the screen. It is an object of the present invention to provide a three-pipe projector apparatus and its convergence control method that can alleviate complicated adjustment work due to differences in correction sensitivity.

  The present invention has R (red), G (green), and B (blue) projection tubes, the first projection tube is arranged at the center, and the second and third projection tubes are arranged horizontally on both sides thereof. The optical axes of the second and third projection tubes are tilted in the direction of the optical axis of the first projection tube around the optical axis of the first projection tube. Storage means for storing correction data indicating convergence correction amounts of R, G, and B colors for a plurality of adjustment points arranged on the screen in a three-tube projector device that displays a color image by superimposing projection images Convergence adjustment means for increasing / decreasing correction data at each adjustment point stored in the storage means in a predetermined adjustment step, and adjusting the adjustment step to be different depending on the position of the adjustment point on the screen; Said compound Calculation means for calculating convergence correction data of pixels existing between the adjustment points based on the adjusted correction data corresponding to each of the adjustment points; and each of the RGB based on the convergence correction data obtained by the calculation means And a correction means for correcting convergence on the screen of the corresponding projection tube based on these auxiliary deflection signals.

  Further, the present invention is used in a three-tube projector apparatus having RGB projection tubes, and stores correction data indicating convergence correction amounts of R, G, and B colors for a plurality of adjustment points arranged in advance on the screen. The convergence correction data of the pixels existing between the adjustment points is calculated based on the correction data corresponding to each of the plurality of adjustment points, and the auxiliary deflection signals for each of the RGB are generated. In a convergence control method for correcting convergence on the screen of a corresponding projection tube based on the above, a mode selection step for selecting an adjustment mode of the convergence; any of the color and the plurality of adjustment points when selecting the adjustment mode; A designating step for designating; and a correction value indicated by the stored correction data is adjusted on the screen. Characterized by comprising a; and convergence adjustment step of adjusting the amount of correction of convergence by increasing or decreasing at a predetermined adjustment step in accordance with the position.

  According to the above-described invention, it becomes possible to reduce the difference in the correction sensitivity of convergence caused by the positional relationship between the screen and the projection tube, and it is easy to adjust the convergence. Therefore, it is possible to adjust the correction data change amount per step of the convergence correction according to the position or color of the screen, thereby making it possible to substantially equalize the correction sensitivity of the convergence of each color on the left and right sides of the screen. It is possible to provide a three-pipe projector apparatus and its convergence control method that can alleviate complicated adjustment work.

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

  FIG. 1 is a block diagram showing an embodiment of a rear projection type three-tube projector device to which the present invention is applied. Actually, a mirror is arranged between each projection tube and the screen, and the image is inverted so that it becomes a normal image when viewed from the front.

  In FIG. 1, a video signal is input to the input terminal 11. This video signal may be given from the outside or may be from a built-in tuner (not shown). The input video signal is supplied to the selection circuit 12. The selection circuit 12 is also supplied with a video signal of a convergence adjustment pattern generated by the adjustment pattern signal generation circuit 13.

  On the other hand, the input device 14 includes operation keys for selecting either the video display mode or the convergence correction mode. The microprocessor 15 discriminates the video display mode and the convergence correction mode from the key operation of the input device 14, and switches and controls the signal selection of the selection circuit 12 corresponding to each mode.

  The video signal selected by the selection circuit 12 is supplied to the video signal processing circuit 16. The video signal processing circuit 16 extracts RGB video signals from the supplied video signal. The video signals of the respective colors are amplified by the amplification circuits 171, 172, 173, respectively, and the corresponding projection tubes 181, 182, 183 are amplified. And is projected onto the back surface of the screen 19 through an optical system (not shown) as appropriate. As a result, the projected images from the projection tubes 181 to 183 are superimposed on the screen 19 to display a color image.

  The video signal selected by the selection circuit 12 is further supplied to the synchronization separation circuit 20 where the synchronization signal is extracted. This synchronization signal is supplied to the main deflection signal generation circuit 21. The main deflection signal generation circuit 21 generates horizontal (H) and vertical (V) main deflection signals based on the input synchronization signal. These HV main deflection signals are output from the projection tubes 181 to 183 respectively corresponding to RGB. Supplied to the main deflection terminal. Each of the projection tubes 181 to 183 has a main deflection coil (not shown) attached to the neck, and deflects the projection optical axis by applying an HV main deflection signal to each main deflection coil. The main deflection signal generation circuit 21 generates horizontal and vertical timing signals synchronized with the main deflection timings and supplies them to the digital convergence unit 22.

  Here, a reflecting mirror is appropriately disposed between the three projection tubes 181 to 183 and the screen 19, and the image light projected from each of the projection tubes 181 to 183 is folded back by the reflecting mirror to the screen 19. As a result, the apparatus can be thinned. However, the positional relationship between the three projection tubes 181 to 183 and the screen 19 is different. For this reason, even if the three projection tubes 181 to 183 are the same, the projection distance is different between the central portion and the peripheral portion of the screen 19, and the projected RGB images are correctly overlapped as they are. And distortion also occurs.

  The digital convergence unit 22 performs convergence adjustment for coping with such a problem. Upon receiving a command for execution of convergence adjustment from the microprocessor 15, the digital convergence unit 22 receives a command for executing the convergence adjustment and based on the synchronization signal from the main deflection signal generation circuit 21. Auxiliary deflection signals for correcting horizontal and vertical convergence corresponding to .about.183 are generated. These six types of auxiliary signals are respectively amplified by the amplification circuits 231 to 236 and supplied to the auxiliary deflection terminals of the projection tubes 181 to 183. The projection tubes 181 to 183 adjust the projection optical axis by applying auxiliary deflection signals to the horizontal and vertical auxiliary deflection coils provided at the respective necks.

  FIG. 2 is a block diagram showing a specific configuration of the digital convergence unit 22. FIG. 3 is a diagram showing a screen display example of an adjustment pattern based on an adjustment pattern video signal selected in the convergence correction mode. In this example, adjustment points are arranged at positions of lattice points by vertical lines and horizontal lines. The

  In FIG. 2, the nonvolatile memory 31 stores data indicating the convergence correction amount at each adjustment point. Data stored in the nonvolatile memory 31 is transferred to the buffer memory 32 in accordance with an instruction from the microprocessor 15. The timing signal generation unit 34 is necessary for the control signals related to addresses and reading of the memories 31 and 32 and the interpolation calculation unit 35 based on the vertical and horizontal scanning timing signals supplied from the main deflection signal generation circuit 21. Control signal is generated. Thereby, the convergence data is read from the memory 32 at a predetermined timing synchronized with the scanning and supplied to the interpolation calculation unit 35.

  The interpolation calculation unit 35 calculates vertical and horizontal correction amounts for each of RGB of the entire screen from the input convergence data of individual adjustment points, and calculates the calculated convergence correction amount data in accordance with the scanning timing. Output to A converters 361-366. The convergence correction amount data is converted into an analog signal by the D / A converters 361 to 366, but is still a stepped waveform including a harmonic component. Therefore, the harmonic components are removed by LPFs (low-pass filters) 371 to 376, and then output from the digital convergence unit 22.

  In the above configuration, the convergence adjustment will be specifically described below.

  First, a pattern image for convergence adjustment is displayed on the screen 19. In this pattern image, for example, as shown in FIG. 3, each lattice point is displayed in a cross pattern so that the convergence can be recognized well at the position of the digital convergence adjustment point. Instead of a cross pattern, a cross hatch image, a character, or the like may be used. When a location with convergence deviation is selected through the input device 14, the microprocessor 15 causes the adjustment pattern video signal generation circuit 13 to display the marker B at the selected location A. Then, according to the user's instruction input, the convergence correction amount obtained by the digital convergence unit 22 is appropriately increased or decreased to adjust the convergence around the marker B.

  However, the amount of change in the convergence adjustment varies depending on the position on the screen even if the correction amount is the same. FIG. 4 shows the amount of change in the display position on the screen when the R projection tube 181 and the screen 19 shown in FIG. 1 are extracted and a predetermined convergence correction amount is given to the R projection tube 181. As shown in this figure, even if the convergence correction amount is the same, the amount of change in convergence on the screen 19 varies depending on the display position, and changes as the projection distance increases as indicated by a, b, and c in the figure. The amount increases.

  In R and B, a significant difference occurs in the amount of raster movement with respect to the predetermined correction amount of convergence according to the display position of the screen 19. That is, the R movement amount is small and the B movement amount is large at the left end of the screen with respect to the predetermined correction amount. Conversely, the R movement amount is large and the B movement amount is small at the right end of the screen.

  Furthermore, a specific example will be shown and described.

  Assume that the adjuster operates the input device 14 to select the convergence adjustment mode. Thus, the microprocessor 15 receives the instruction for starting the convergence adjustment, and controls the selection circuit 12 to select the video signal of the adjustment pattern output from the adjustment pattern signal generation circuit 13. At this time, an adjustment pattern image as shown in FIG. 3 is displayed on the screen. When the adjuster instructs the adjustment position to the microprocessor 15 via the convergence input device 14, the microprocessor 15 instructs the adjustment pattern generation signal generation circuit 13 in the vicinity of the adjustment point A indicated by the adjuster. (In the figure, a rectangle) B is displayed. The viewer adjusts the convergence of the position of the marker B while looking at the screen. The microprocessor 15 immediately increases or decreases the convergence data stored in the memory 32 in the digital convergence unit 22 upon receiving an instruction to perform adjustment by the viewer.

  The present invention is characterized in that the increase / decrease amount of the convergence data is changed according to the position of the screen 19 on the screen. Regarding the horizontal direction of R, there is a difference in convergence correction sensitivity according to the position of the screen 19 on the screen as shown in FIG. Therefore, as shown in FIG. 5A, the display area S is divided into areas SR1, SR2, and SR3, and the difference in correction sensitivity is controlled by changing the data increase / decrease amount per step in each area. Reduce. For example, the value of the convergence data stored in the memory 32 of the digital convergence unit 22 is increased or decreased by 8 in the region SR1, 7 in the region SR2, and 6 in the region SR3.

  Further, regarding the correction sensitivity in the horizontal direction of B, since a difference opposite to the horizontal direction of R occurs, the display area S is divided into areas SB1, SB2, and SB3 as shown in FIG. The value of the convergence data stored in the memory 32 of the digital convergence unit 22 is increased or decreased by 8 in the area SB3, 7 in the area SB2, and 6 in the area SB1.

  The flow of processing that further embodies the adjustment operation is shown in the flowchart of FIG. In this processing, a case where an input operation is assigned to the numeric keypad of the remote controller shown in FIG.

First, when the convergence adjustment mode is selected, the numeric keys are assigned as follows.
2 Move to the adjustment point,
8 ... Move down the adjustment point,
4 ... Move to the left of the adjustment point,
6 ... Move to the right of the adjustment point,
5. Shift to adjustment mode,
7 ... Adjustment data storage and termination.
Next, in the adjustment work mode, assignment is performed as follows.
2 ... Move up to convergence,
8 ... Move down the convergence,
4. Move to the left of convergence,
6. Move to the right of convergence,
5 ... Move to adjustment point selection mode,
3 ... Change the color to be adjusted.

  In FIG. 6, at the start of adjustment (step S100), as the initial setting (step S101), adjustment point coordinate settings (for example, x = 0, y = 0) and adjustment target color are specified (for example, R). Next, an adjustment pattern is displayed (step S102). When the adjustment point (x, y) is selected as the operation mode, an adjustment marker (for example, a range of 0 ≦ x ≦ 6, 0 ≦ y ≦ 5) is blinked and displayed near the adjustment point (step S103).

  Waiting for input (step S104), when any of the keys “2”, “8”, “4”, “6” is input, for example, adjustment within the range of 0 ≦ x ≦ 6, 0 ≦ y ≦ 5 The adjustment point is moved by increasing / decreasing the point coordinates (x, y) (step S105), and the process returns to step S103. When the key “7” is input in step S104, the adjustment data is stored in the nonvolatile memory 31 (step S109), the adjustment pattern display is erased (step S110), and the convergence adjustment is terminated (step S110). Step S111).

  When the key “5” is input, the operation mode is changed to the adjustment mode, and at the same time, the adjustment marker is changed to the lighting display (step S106), and the process returns to step S103 again to wait for the input (step S108). If the key “3” is input, the adjustment target color is changed to blue if it is currently red, and to red if it is blue (step S112). When the key “5” is input, the operation mode is changed and the process returns to step S103.

  When the keys “2” and “8” are input, it is a command for moving the convergence in the vertical direction, and the adjustment point adjustment data (adjustment point color, adjustment point coordinates (x, y) correction data of 8) (Step S113) When the keys "4" and "6" are input, they are given as horizontal convergence adjustment commands, so the adjustment color and adjustment step are determined according to the case classification shown in Step S130. To do.

  Specifically, if it is determined in step S114 that the color to be adjusted is R (red), the X coordinate is determined (step S115), and if x = 0, 1, 2, 3, the adjustment step. = 8 (step S117), when x = 4,5, adjustment step = 7 (step S118), and when x = 6, adjustment step = 6 (step S119). If it is determined in step S114 that the color to be adjusted is B (blue), the X coordinate is determined (step S116). If x = 0, the adjustment step is 6 (step S120). In the case of = 1, 2, the adjustment step = 7 (step S121), and in the case of x = 3, 4, 5, 6, the adjustment step = 8 (step S122).

  When the adjustment step is determined by the above processing, the adjustment point adjustment data is increased or decreased by the adjustment step (step S123). The adjustment is continued by repeating the above. The process that characterizes the present invention is that the process within the dotted line (step S130) is added.

  As described above, the projector device according to the present embodiment changes according to the position of the screen 19 by changing the increase / decrease amount of the convergence data stored in the internal memory 32 of the digital convergence unit 22 according to the position of the screen 19. The difference in convergence correction sensitivity can be reduced.

  However, the present invention does not specify the circuit configuration. In addition, the embodiment can have various configurations other than that of FIG. For example, the sensitivity difference can be further reduced by further finely dividing the region. As for G (green), there is a difference in projection distance and angle between the central portion of the screen and the peripheral portion as shown in FIG. 1, and there is a difference in sensitivity although not as much as the horizontal direction of R and B. Therefore, regarding G, if the change amount is changed according to the position of the adjustment point, the sensitivity difference can be reduced. The circuit configuration in this case is not limited to FIG.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by variously modifying the constituent elements without departing from the spirit of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements according to different embodiments may be appropriately combined.

1 is a block configuration diagram showing an embodiment of a rear projection type three-tube projector device to which the present invention is applied. The block diagram which shows the specific structure of the digital convergence part in embodiment of FIG. The figure which shows the example of a screen display of the pattern for convergence adjustment used with a projector apparatus. The figure which shows a mode that a difference arises in a correction sensitivity according to the display position on a screen, when a predetermined | prescribed convergence correction amount is given to the R projection tube. The figure which shows the pattern for convergence adjustment on a screen, and adjustment step area | region division in embodiment of FIG. The flowchart which shows concretely the convergence adjustment operation | movement of embodiment of FIG. The figure which shows the example of arrangement | positioning of the ten key of the remote control to which input operation is assigned in embodiment of FIG.

Explanation of symbols

11: Input terminal,
12 ... selection circuit,
13: Adjustment pattern signal generation circuit,
14 ... input device,
15 ... Microprocessor,
16 ... Video signal processing circuit,
171, 172, 173... Amplification circuit,
181, 182, 183 ... Projection tube,
19 ... Screen,
20: Sync separation circuit,
21 ... Main deflection signal generation circuit,
22 ... Digital convergence section,
231 to 236... Amplifier circuit,
31 ... Non-volatile memory,
32 ... Buffer memory,
34 ... Timing signal generator,
35 ... interpolation operation part,
361-366 ... D / A converter,
371 to 376... LPF (low pass filter).

Claims (6)

It has R (red), G (green), and B (blue) projection tubes, the first projection tube is arranged in the center, and the second and third projection tubes are arranged in the horizontal direction on both sides thereof. The optical axes of the second and third projection tubes are inclined in the direction of the optical axis of the first projection tube around the optical axis of the first projection tube, and the projection images from the projection tubes are superimposed on the screen. In a three-tube projector that displays color images together,
Storage means for storing correction data indicating convergence correction amounts of R, G, and B colors for a plurality of adjustment points arranged on the screen;
Convergence adjustment means for increasing / decreasing correction data at each adjustment point stored in the storage means in a predetermined adjustment step, and adjusting the adjustment step to be different according to the position of the adjustment point on the screen;
A calculation means for calculating convergence correction data of pixels existing between the adjustment points based on the adjusted correction data corresponding to each of the plurality of adjustment points;
Correction means for generating auxiliary deflection signals for each of the RGB based on the convergence correction data obtained by the calculation means, and correcting the convergence on the screen of the corresponding projection tube based on these auxiliary deflection signals;
A three-pipe projector device comprising:   2. The convergence adjusting means according to claim 1, wherein the adjustment step is small for an adjustment point having a long distance between the projection tube and the screen, and the adjustment step is large for an adjustment point having a short distance. Three tube projector.   The first projection tube is a G projection tube, the second and third projection tubes are R and B projection tubes, and the convergence adjusting means is at least in the horizontal direction of the R and B projection tubes. 2. The three-pipe projector apparatus according to claim 1, wherein the adjustment step is different only at the position of the adjustment point on the screen. It has R (red), G (green), and B (blue) projection tubes, the first projection tube is arranged in the center, and the second and third projection tubes are arranged in the horizontal direction on both sides thereof. The optical axes of the second and third projection tubes are inclined in the direction of the optical axis of the first projection tube around the optical axis of the first projection tube, and the projection images from the projection tubes are superimposed on the screen. Correction data indicating convergence correction amounts of R, G, and B colors are stored for a plurality of adjustment points that are used in a three-pipe projector apparatus that displays a color image together and arranged in advance on the screen. Based on the correction data corresponding to each of the plurality of adjustment points, the convergence correction data of the pixels existing between the adjustment points is calculated, and the auxiliary deflection signals for each of the RGB are generated, and the correction is performed based on these auxiliary deflection signals. Projection tube screen In convergence control method for correcting convergence in,
A mode selection step of selecting an adjustment mode of the convergence;
A designation step for designating one of the plurality of adjustment points when selecting the adjustment mode;
A convergence adjustment step of adjusting a correction amount of convergence by increasing or decreasing a correction value indicated by the stored correction data in a predetermined adjustment step according to the position of the adjustment point on the screen. A convergence control method for a three-tube projector device.   5. The convergence adjustment step according to claim 4, wherein the adjustment step is small for an adjustment point having a long distance between the projection tube and the screen, and the adjustment step is large for an adjustment point having a short distance. A convergence control method for a three-pipe projector device.   The first projection tube is a G projection tube, the second and third projection tubes are R and B projection tubes, and the convergence adjustment step is performed at least in the horizontal direction of the R and B projection tubes. 5. The convergence control method for a three-pipe projector apparatus according to claim 4, wherein the adjustment step is different only at the position of the adjustment point on the screen.

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