JP2017215475A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device with an interchangeable lens, the projection type display device capable of performing optimal image correction.SOLUTION: There is provided a projection type display device with a projection lens that projects an image on a projection target surface and is interchangeable, the projection type display device comprising: an interchange detection part that detects the interchange of the projection lens; a correction data acquisition part that, when the interchange detection part detects the interchange of the projection lens, acquires first correction data according to the characteristics of the interchanged projection lens; and an image processing part that corrects the image to correct the characteristics of the interchanged projection lens on the basis of the first correction data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection display device, and more particularly to image correction.

  Projection display devices that display an image on a screen or the like via a projection lens are widely used as large screen display devices. In recent years, there has been an increasing demand for higher image quality of display images, and image quality has been increasing.

  For example, in Patent Document 1, in order to suppress deterioration of a display image due to chromatic aberration of magnification that occurs due to the characteristics of a projection lens, the shift of red, green, and blue subpixels is corrected by image processing based on the zoom amount, thereby improving image quality. Proposals to achieve this have been made.

JP 2010-103886 A

  The installation location of the projection display device varies depending on the user, and there is a projection display device in which the projection lens can be exchanged in order to cope with various installation locations.

  However, in the prior art disclosed in the above-mentioned patent document, replacement of the projection lens is not taken into consideration. Therefore, when the projection lens is replaced, the chromatic aberration of magnification changes, and the correction may not always be optimal.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a projection type display device that enables optimum image correction in a projection type display device with interchangeable lenses.

  In order to achieve the above object, the present invention provides a projection type display device in which a projection lens that projects an image on a projection surface is replaceable, an exchange detection unit that detects exchange of the projection lens, and the exchange detection When the unit detects replacement of the projection lens, the replacement is performed based on the correction data acquisition unit that acquires first correction data according to the characteristics of the replaced projection lens, and the first correction data. And an image processing unit for correcting the image so as to correct the characteristics of the projection lens.

  ADVANTAGE OF THE INVENTION According to this invention, the projection display apparatus which enables optimal image correction | amendment in the projection display apparatus which can replace | exchange a lens can be provided.

Overall configuration diagram of a projection display device according to Example 1 and Example 3 Flowchart in the first embodiment Overall Configuration of Projection Type Display Device in Embodiment 2 Flowchart in the second embodiment Flowchart in the third embodiment

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

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an overall configuration diagram of a projection display apparatus according to Embodiment 1 of the present invention. The control unit 107 is composed of an MPU such as a microcomputer, and performs overall control of the projection display device. Further, the user operation input to the operation unit 108 is read and an operation corresponding to the operation is performed.

  The storage unit 109 stores a program executed by the control unit 107, adjustment parameters for predetermined image processing of the image processing unit 102, correction data described later, and the like.

  The image signal input unit 101 receives an image input signal from the outside based on a control signal from the control unit 107, and outputs the image input signal input to the image processing unit 102.

  The image processing unit 102 performs various image processing such as resolution conversion, trapezoidal correction, and image quality correction such as brightness, contrast, and color based on a control signal from the control unit 107. Further, correction due to the characteristics of the projection lens described later is also performed. The image signal processed by the image processing unit 102 is output to the panel drive unit 103.

  The panel drive unit 103 generates a drive signal for driving the liquid crystal panels 104a to 104c corresponding to RGB based on the input image signal. The liquid crystal panels 104a to 104c may be transmissive liquid crystal panels or reflective liquid crystal panels. Further, a light modulation element other than the liquid crystal panel may be used.

  Based on a control signal from the control unit 107, the light source driving unit 105 performs light source driving such as turning on / off the light source 106 and keeping the power supplied to the light source 106 constant.

  Light emitted from the light source 106 is split into RGB colors by an optical system (not shown) and guided to the liquid crystal panels 104a to 104c. The light guided to the liquid crystal panels 104a to 104c is optically modulated by the liquid crystal panels 104a to 104c and projected onto a projection surface such as a screen by the projection lens 150.

  The projection lens 150 can be exchanged, and the user can select a projection lens that matches the projection location. The projection lens 150 includes an in-lens storage unit 151 for storing correction data (first correction data) according to the characteristics of the projection lens.

  This correction data is, for example, data for correcting lateral chromatic aberration, which is one of the characteristics of the projection lens. Since chromatic aberration of magnification is a phenomenon in which the size of an image differs depending on the color, the color is shifted and projected particularly at the periphery of the projected image. Therefore, as the correction data, the distance from the optical axis of the projection lens 150 and the shift amount of the R image and the B image based on the G image at the distance are stored in the in-lens storage unit 151.

  When the projection lens 150 is attached to the projection display device, the in-lens storage unit 151 and the control unit 107 are electrically connected. The exchange detection unit 114 detects whether or not the projection lens 150 has been exchanged. For example, a micro switch that is turned on when the projection lens 150 is attached and turned off when the projection lens 150 is removed can be used.

  When the replacement detection unit 114 detects that the projection lens 150 has been replaced, the control unit 107 (correction data acquisition unit) acquires the correction data held by the in-lens storage unit 151 and stores the correction data in the storage unit 109.

  The image processing unit 102 performs image correction based on the correction data stored in the storage unit 109. In this embodiment, the color shift of the projected image due to the chromatic aberration of magnification is corrected. For example, the color shift of the projected image can be corrected by dividing the image into arbitrary regions and changing the enlargement ratio of the R image and the B image according to the shift amount for each divided region.

  The zoom drive unit 110 is a drive unit for changing the zoom ratio by moving the zoom lens group provided in the projection lens 150 in the optical axis direction and changing the projection magnification. The variable magnification detector 111 detects the position of the variable magnification lens group and outputs the detected position to the controller 107. The control unit 107 stores the position of the variable power lens group in the storage unit 109.

  The correction data further stores a coefficient indicating how the shift amount changes depending on the position of the zoom lens group, and the image processing unit 102 performs image correction based on the correction data and the position of the zoom lens group. By doing so, the accuracy of correction can be increased.

  The shift drive unit 112 is a drive unit for shifting the projection position by moving the projection lens 150 in the direction perpendicular to the optical axis. The shift position detection unit 113 detects the shift position of the projection lens 150 and outputs it to the control unit 107. The control unit 107 calculates which area of the projection lens is used from the shift position of the projection lens 150 and causes the storage unit 109 to store the calculation result.

  The image processing unit 102 performs image correction based on the deviation amount between the center of the optical axis of the projection lens 150 and the center of the currently used area, which is calculated based on the correction data and the shift position, thereby correcting the accuracy. Can be increased.

  Next, the operation of the control unit 107 of this embodiment will be described with reference to the flowchart of FIG.

  In S101, it is determined whether or not the projection lens 150 has been replaced. When it is determined that the projection lens 150 has been replaced based on the detection result of the replacement detection unit 114, the process proceeds to S102, and when it is determined that the projection lens 150 has not been replaced, the process proceeds to S103.

  In S102, the correction data stored in the in-lens storage unit 151 is acquired and stored in the storage unit 109. After storing, the process proceeds to S103.

  In S103, the stored correction data is transmitted to the image processing unit 102, and the image processing unit 102 is controlled to perform image correction based on the correction data.

  As described above, when the replacement of the projection lens is detected, the correction data is acquired from the projection lens, and the image correction is performed based on the correction data. Image correction is possible.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is an overall configuration diagram of a projection display apparatus according to Embodiment 2 of the present invention. In addition, about the structure which overlaps with Example 1, the same code | symbol as Example 1 is attached | subjected and description is abbreviate | omitted suitably.

  The difference from the first embodiment is that a communicable unit 115 such as an external server is added.

  In the lens storage unit 151 of the projection lens 150, lens type data indicating the type of the projection lens is stored. The lens type data is, for example, an ID unique to the projection lens.

  The storage unit 109 stores correction data for each type of projection lens that can be attached in advance.

  In the projection display device configured as described above, the operation of the control unit 107 of this embodiment will be described using the flowchart of FIG.

  In S201, lens type data indicating the type of projection lens stored in the in-lens storage unit 151 is acquired.

  In S <b> 202, it is confirmed whether correction data corresponding to the acquired lens type data is stored in the storage unit 109. If stored, the process proceeds to S103, and if not stored, the process proceeds to S203.

  In S <b> 203, correction data corresponding to the corresponding lens type data is acquired from the server on the network by the communication unit 115 and stored in the storage unit 109.

  In S103, the stored correction data is transmitted to the image processing unit 102, and the image processing unit 102 is controlled to perform image correction based on the correction data.

  As described above, when the replacement of the projection lens is detected, the lens type data is acquired from the projection lens, and the correction data corresponding to the lens type is acquired from the correction data stored in advance. By performing image correction based on the correction data, optimum image correction can be performed even in a projection display device in which a lens can be replaced.

  In this embodiment, when there is no correction data corresponding to the lens type, the correction data is acquired through communication. A USB memory may be connected to the storage unit 109 and stored in the storage unit 109.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  The overall configuration is the same as that of the first embodiment. In addition, about the structure which overlaps with Example 1, the same code | symbol as Example 1 is attached | subjected and description is abbreviate | omitted suitably.

  In the storage unit 109, in addition to the correction data (first correction data) acquired from the projection lens, correction data (second correction data) for correcting image degradation caused by individual differences in the projection display device. It is remembered.

  Image degradation caused by individual differences may be caused by, for example, an error in the fixed positions of the liquid crystal panels 104a to 104c, and the pixel positions desired to be displayed on the same projection screen in the respective liquid crystal panels may be shifted. May be projected out of color. Therefore, the total shift amount of the R image and the B image is stored on the basis of the G image as correction data for correcting image degradation caused by individual differences. Based on this total shift amount, the resolution conversion and trapezoid correction parameters of the image processing unit 102 are changed, and the entire image can be shifted by adjusting the position where display is started on the panel. Degradation can be corrected.

  In the projection display device configured as described above, the operation of the control unit 107 of this embodiment will be described using the flowchart of FIG.

  In S301, correction data resulting from individual differences is acquired from the storage unit 109.

  In S302, correction data acquired from the in-lens storage unit 151 and correction data for correcting image degradation caused by individual differences are transmitted to the image processing unit 102, and image correction is performed based on the correction data. The image processing unit 102 is controlled.

  As described above, when the replacement of the projection lens is detected, the lens type data is acquired from the projection lens, and the correction data corresponding to the lens type is acquired from the correction data stored in advance. Furthermore, by acquiring correction data resulting from individual differences and performing image correction based on the correction data, an optimum image correction can be performed even in a projection display device in which lenses can be replaced.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  For example, although the correction data has been described as data for correcting the chromatic aberration of magnification, the present invention can be applied as long as the correction data corresponds to the characteristics of the projection lens such as a decrease in peripheral light amount.

  The projection position may be shifted by shifting the image forming position on the liquid crystal panel.

  Also, the control unit acquires unique information such as the ID of the mounted projection lens and stores it in the storage unit, acquires the unique information of the projection lens every predetermined time, and compares it with the unique information stored in the storage unit However, when it is determined that the unique information is different, it may be determined that the projection lens has been replaced.

  Further, the function of the control unit 107 may be configured to be processed by the image processing unit 102.

  Note that the described processing can also be performed in a computer connected to the projection display device. That is, even if the connected computer acquires correction data for the replaced projection lens, corrects the image so as to correct the characteristics of the replaced projection lens, and outputs the corrected image to the projection display device. Good.

  The present invention is effective for correcting an image of a projection display device.

105 Control Unit 102 Image Processing Unit 114 Exchange Detection Unit

Claims (10)

A projection type display device in which a projection lens for projecting an image onto a projection surface is replaceable,
An exchange detection unit for detecting the exchange of the projection lens;
A correction data acquisition unit that acquires first correction data according to characteristics of the exchanged projection lens when the exchange detection unit detects replacement of the projection lens;
An image processing unit for correcting the image so as to correct a characteristic of the exchanged projection lens based on the first correction data.   The projection type display device according to claim 1, wherein the correction data acquisition unit acquires the first correction data stored in the projection lens. A storage unit for storing a plurality of the first correction data respectively corresponding to different projection lenses;
The projection display apparatus according to claim 1, wherein the correction data acquisition unit acquires the first correction data from the storage unit according to the exchanged projection lens. A communication unit capable of communicating with an external server storing the first correction data;
The projection display device according to claim 1, wherein the correction data acquisition unit acquires the first correction data corresponding to the exchanged projection lens by the communication unit. An external memory connection unit to which an external memory in which the first correction data is stored can be connected;
The correction data acquisition unit acquires the first correction data corresponding to the exchanged projection lens from the external memory connected to the external memory connection unit. Projection display device. A zoom drive unit that moves a zoom lens that changes the zoom ratio of the projection lens, and a zoom detection unit that acquires the position of the zoom lens of the projection lens;
6. The image processing unit according to claim 1, wherein the image processing unit corrects the image so as to correct a characteristic of the projection lens based on the first correction data and the position of the zoom lens. A projection display device according to claim 1. A shift driver for shifting the projection lens;
A shift position detector for detecting a shift position of the projection lens;
6. The image processing unit according to claim 1, wherein the image processing unit corrects the image so as to correct a characteristic of the projection lens based on the first correction data and the shift position. The projection type display device described in 1. The characteristic of the projection lens is a characteristic of chromatic aberration of magnification,
The projection display device according to claim 1, wherein the image processing unit corrects the image so as to correct a color shift caused by the magnification chromatic aberration. A storage unit for storing second correction data for correcting individual differences of the projection display device;
The image processing unit corrects the image based on the first correction data and the second correction data so as to correct a characteristic of the projection lens and an individual difference of the projection display device. The projection type display device according to claim 1, wherein the projection type display device is characterized in that A control method of a projection display device in which a projection lens that projects an image on a projection surface is replaceable,
A correction data acquisition step for acquiring first correction data according to the characteristics of the exchanged projection lens;
An image processing step of correcting the image so as to correct the characteristics of the projection lens based on the first correction data. A control method for a projection display device, comprising:

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