JP2007256878A - Projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the uniformity of luminance at respective parts on the screen of a projection display device in order to accurately compare and evaluate an electronic image for medical care and an X-ray film. <P>SOLUTION: The projection display device 100 has an optical driving part 1, a projection lens 2, a reflecting mirror 3, a luminance detection sensor 5, a luminance detection means 10, a control part and a screen 4 comprising display areas divided into plurality. The luminance of each of the divided display areas of the screen 4 is acquired by the luminance detection sensor 5 and the luminance detection means 10, and the optical driving part 1 is controlled by the control part based on the acquired result, whereby the luminance of the divided display areas of the screen 4 is made uniform. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projection display device, and more particularly to a projection display device that projects from the back of a screen.

In a medical field, it is common to observe and diagnose an image such as an X-ray X-ray film or a magnetic resonance image (MRI) film. The X-ray image is printed on a large film. Diagnosis is made by placing this X-ray film in front of a white surface light source called Sherkasten and observing Sherkasten light transmitted through the X-ray film. In the examination of these medical images, it is required to simultaneously compare a plurality of medical images in order to make an accurate diagnosis.
Here, the Schaukasten generally has a structure in which several white fluorescent lamps are arranged on the back of a horizontally long rectangular screen, and substantially uniform white light is emitted from the screen surface. In addition, in order to make image information that is difficult to discriminate only with white light to stand out and be easy to interpret, Schaukasten using color light sources such as blue, green, and red has been proposed (see, for example, Patent Document 1). .
On the other hand, in recent years, X-ray images have been digitized and diagnosed with electronic displays. By digitizing X-ray images, it becomes easier to store and organize data, and it is expected that X-ray diagnosis on electronic displays will continue to expand in the future.

As this type of electronic display, the same resolution and gradation of medical images as those observed with X-ray films are required, and at present, a monochrome liquid crystal display of about 20 inches is used. It has been. In addition, cases in which X-ray films and X-ray electron images as described above are mixed and compared are increasing.
Therefore, if the liquid crystal display can be used as the Schaukasten, the X-ray film and the X-ray electronic image can be compared using the same display, which is convenient.
However, with this type of electronic display, it is difficult to achieve the resolution and gradation of a medical image that can withstand medical diagnosis. In addition, it is difficult to realize a luminance that can withstand use as a Schaukasten. For this reason, the fact is that the Schaukasten and the electronic display are used side by side.
JP 2000-241749 A

As described above, in order to diagnose X-ray images, it is necessary to compare a plurality of images simultaneously. The applicant of the present invention has proposed and developed to use a projection display device as means for interpreting both an image of an X-ray film and an electronic image by Schaukasten.
In such an apparatus, it is conceivable to divide the display area of one screen into a plurality of parts, and display the X-ray film and the electronic image, or the plurality of X-ray films, and further the plurality of electronic images side by side. . When such a plurality of images are compared, if the brightness of the display areas of the two is different, a delicate shadow may be overlooked and a misdiagnosis may be induced.
Therefore, in order to compare and evaluate a plurality of images with the same accuracy, it is necessary to make the brightness of each divided area uniform. In the optical system of the conventional projection display device, however, compared with the center of the optical system. Since there is a problem that the luminance around the area is lowered, it is difficult to compare and evaluate a plurality of images.
An object of the present invention is a projection display device that can be used as a large-screen and high-precision shakasten, and can also be used as an X-ray electronic image display device, and does not induce misdiagnosis in the X-ray film and X-ray electronic image display areas It is to realize a projection display device that suppresses the difference in luminance.

A projection display device according to a first invention includes an optical drive unit, a projection lens, a screen, a split display control unit, a luminance detection unit, and a luminance adjustment unit. The optical drive unit includes a light source, and emits light modulated by an image signal or white light as backlight light. The projection lens expands the light emitted from the optical drive unit. The screen projects light from the projection lens. The split display control means controls the optical drive unit so that an image is displayed by being divided into a plurality of display areas on the screen. The luminance detection unit detects the luminance of each of the plurality of display areas on the screen. The brightness adjusting means adjusts the brightness of each display area on the screen based on the detection result of the brightness detecting unit.
In this apparatus, light modulated by an image signal or white light as backlight light is emitted from the optical drive unit. And the light from this optical drive part is expanded by a projection lens, and is projected on a screen. At this time, the optical drive unit is controlled, and an image is displayed by being divided into a plurality of display areas on the screen. The brightness is detected in each of the plurality of divided display areas, and the brightness of each display area on the screen is adjusted based on the detection result.
A projection display device according to a second invention is the device according to the first invention, further comprising a folding mirror that reflects the light emitted from the projection lens and projects it onto the screen.

In this apparatus, the light from the projection lens is reflected by the folding mirror and projected onto the screen.
According to a third aspect of the present invention, there is provided a projection display apparatus according to the first or second aspect of the present invention, further comprising electronic image storage means for storing an electronic image serving as a reference for the image signal. Here, electronic image data can be held.
According to a fourth aspect of the present invention, there is provided a projection display apparatus according to any one of the first to third aspects, wherein the optical drive unit is based on an illumination optical system that collects light emitted from the light source and an image signal. And a display element that modulates light from the illumination optical system by changing the transmittance.
In this apparatus, the light emitted from the light source is collected by the illumination optical system, and the display element modulates the light from the illumination optical system by changing the transmittance based on the image signal.
Here, since the light from the light source is collected by the illumination optical system, the display element can be irradiated with light efficiently.
A projection display apparatus according to a fifth aspect of the present invention is the apparatus according to any one of the first to fourth aspects, further comprising an X-ray film holding unit and an X-ray film insertion detection unit. The X-ray film holding means is disposed on the outer periphery of the screen and holds the X-ray film on the screen. The X-ray film insertion detecting means detects in which area on the plurality of divided display areas on the screen the X-ray film is inserted. Then, the brightness adjusting means executes the brightness adjustment when the X-ray film is inserted.

Here, it is detected whether or not the X-ray film has been inserted, and the luminance adjustment with other regions is executed when the X-ray film has been inserted. Thereby, unnecessary brightness adjustment can be prevented from being executed.
A projection display device according to a sixth aspect of the present invention is the device according to any one of the first to fifth aspects, further comprising a housing that houses the optical drive unit, the projection lens, and the screen inside, the luminance detection unit, A brightness detection sensor (hereinafter referred to as “brightness detection sensor”) and brightness detection means are provided, and the brightness detection sensor is disposed inside the housing.
Thereby, it is not necessary to change the exterior of the projection display device in order to install the brightness detection sensor. For example, the light detection sensor for adjusting the brightness of the projection display device can be shared as the brightness detection sensor. .
A projection display device according to a seventh aspect of the present invention is the projection display device according to any one of the first to sixth aspects, wherein the luminance detection sensor is disposed in a region irradiated with reflected light from the screen.
Thereby, the space for arrange | positioning a brightness | luminance detection sensor can be made small.
A projection display device according to an eighth aspect of the present invention is the projection display device according to any one of the first to fifth aspects, wherein the casing has a hole provided in a region irradiated with the reflected light from the folding mirror, and brightness detection is performed. The sensor is arranged in a region where the reflected light is irradiated through the hole.

Thus, by using the X-ray film with a test pattern and the electronic image with the test pattern in which the luminance of 100% white and 0% white is recorded at the time of photographing, the luminance is adjusted based on the luminance level of white 100%. The projection display device of the present invention can be set to perform comparative diagnosis only when the luminance level of white 100% is adjusted and the luminance level of white 0% is within a certain range. If the X-ray film and X-ray electronic image that have different dynamic ranges (range of brightness level from 0% white to 100% brightness white) are mixed, a comparison diagnosis is made as it is and a misdiagnosis is made. Such a case can be eliminated.
A projection display device according to a ninth aspect of the present invention is the projection device according to any one of the first to eighth aspects, wherein the luminance adjustment means is a minimum value based on the luminance value of each divided display area of the screen acquired by the luminance detector. The brightness value is determined, and the minimum brightness value area information indicating which divided display area of the screen the minimum brightness value belongs to is determined. The divided display control means controls the transmittance of the corresponding area of the display element corresponding to the divided display area other than the divided display area of the screen indicated by the minimum luminance value area information in a direction approaching the minimum luminance value. .
As a result, the brightness of the divided display area of the screen can be adjusted with high accuracy.

According to a tenth aspect of the present invention, in the projection type display device according to any one of the first to ninth aspects, the luminance detector has a plurality of sensors provided in each of the plurality of divided display areas of the screen. is doing.
Thereby, since the brightness | luminance about several places of each division | segmentation display area of a screen can be detected, a more accurate brightness | luminance adjustment can be performed.
An X-ray film according to an eleventh aspect of the present invention is an X-ray film that is inserted into an X-ray film insertion region of the projection display device according to any of the first to tenth aspects, wherein the X-ray film is smaller than the X-ray film insertion region. A first portion photographed at a luminance of 100% white and a second portion photographed at a luminance of white 0%.
By using such an X-ray film for a projection display device, it is possible to adjust the luminance with high accuracy in consideration of the dynamic range.
An X-ray film according to a twelfth aspect of the invention is an X-ray film to be inserted into an X-ray film insertion area of the projection display device according to any of the first to tenth aspects, wherein the X-ray film is smaller than the X-ray film insertion area. A plurality of first portions photographed at a luminance of 100% white and a plurality of second portions photographed at a luminance of 0% white.

  By using such an X-ray film for a projection display device, it is possible to adjust the luminance more accurately in consideration of the luminance and dynamic range of a plurality of portions of the divided area of the screen.

  A projection display device according to the present invention has a large screen, and has a plurality of divided display areas on the screen, and each divided display area can be used as an X-ray electronic image display screen and a Schaukasten. It can be used as And since the brightness of the divided display areas on each screen can be adjusted equally, comparison of X-ray films, comparison of X-ray electron images, comparison of X-ray films and X-ray electron images can be performed accurately and easily. Can be done.

[First Embodiment]
<Overall configuration of projection display device>
FIG. 1 shows an overall configuration diagram of a projection display apparatus 100 according to the first embodiment of the present invention. The projection display device 100 is a rear projector, and has, for example, a screen having a size that can secure a plurality of display areas of 20 inches or more, and has a function that can be used as a shark caster.
The projection display apparatus 100 mainly includes an optical drive unit 1, a projection lens 2 that expands light emitted from the optical drive unit 1, a folding mirror 3 that reflects light from the projection lens 2, and a folding mirror 3. In order to hold the X-ray film F inserted into the screen 4, the screen 4 on which the reflected light from the screen 4 is projected, the sensor 5 that detects the luminance of the reflected light of the folding mirror 3 to detect the luminance on the screen 4. X-ray film holding means 6 and a sensor 7 for detecting that the X-ray film F has been inserted.
Further, the projection display device 100 receives the signal from the luminance detection sensor 5 and detects the luminance, and the X-ray film F receives the signal from the X-ray film insertion detection sensor 7. X-ray film insertion detecting means 11 for detecting insertion into the film holding means 6.

Further, the projection display apparatus 100 includes a microcomputer including a CPU 15, a ROM 16, a RAM 17, and the like. These are connected to the above-described luminance detection means 10 and X-ray film insertion detection means 11 through the bus 18, and are also connected to an electronic image storage means 20 and a screen display control means 21, and further to an interface. Display means 24 and input means 25 are connected through 22 and 23, respectively. The screen display control means 21 is connected to a screen display memory 26 for storing electronic image information for screen display.
The constituent members except for the display unit 24 and the input unit 25 are housed in the housing 12 or supported by the housing 12.
The light source driving unit 1 is a part that emits light modulated by an image signal or white light as backlight light, and includes a light source 30, an illumination optical system 31, and a display element 32 as shown in FIG. ing. As the light source 30, for example, an ultra-high pressure mercury lamp or the like is used. The illumination optical system 31 is a part that divides and combines the light emitted from the light source 30, and the illumination optical system 31 realizes uniform illumination on the display element 32. The display element 32 is a transmissive type, and a liquid crystal panel or the like having resolution and gradation that can withstand medical images is used. The display on the screen 4 can be changed by changing the transmittance of the display element 32.

The projection lens 2 is composed of, for example, a plurality of lenses. The projection lens 2 takes in a light beam transmitted through the display element 32 and projects it onto the folding mirror 3 shown in FIG.
The folding mirror 3 reflects the light emitted from the projection lens 2 to the screen 4 and the luminance detection sensor 5 and is installed at a position where the light transmitted through the display area of the display element 32 is projected onto the screen 4. ing.
The luminance detection sensor 5 is an optical sensor such as a photodiode or a phototransistor, for example, and converts the luminance into a physical quantity (for example, an amount of current) proportional to the luminance sensor. The brightness detection sensor 5 is set in a range where the reflected light from the folding mirror 3 is irradiated and at a position where the reflected light from the folding mirror 3 to the screen 4 is not blocked.
An example of the arrangement of the luminance detection sensor 5 is shown in FIG. FIG. 3 is a front view of the projection display apparatus 100. In this example, three luminance detection sensors 5 are installed at the center of each upper end of, for example, three divided display areas (described later) constituting the screen 4 inside the housing 12.
In FIG. 3, the luminance detection sensor 5 is installed at the upper end of each of the three divided display areas constituting the screen 4, but within the range where the reflected light from the folding mirror 3 is irradiated, and It may be installed anywhere as long as it does not block the reflected light from the folding mirror 3 to the screen 4.

The X-ray film insertion detection sensor 7 is a sensor that detects that the X-ray film F has been inserted into the X-ray film holding means 6 and that the X-ray film F that has been inserted has been removed. A physical quantity (for example, a change in pressure or an amount of current) indicating whether or not the means 6 is inserted or removed is acquired. For example, the X-ray film insertion detection sensor 7 is installed in a pressure sensor for measuring a pressure change in a portion of the X-ray film holding means 6 that comes into contact with the X-ray film, or in an area where the X-ray film of the X-ray film holding means 6 is inserted, An optical sensor (for example, a transmissive photointerrupter or a reflective photointerrupter) that measures changes in the amount of light transmitted or reflected is used.
The CPU 15 realizes a divided display control function together with the screen display control means 21, and the optical drive unit 1 is controlled by this divided display control function, and an image is displayed by being divided into a plurality of display areas on the screen 4. It is possible. In addition, the CPU 15 has a function of adjusting the luminance of each divided display area from the luminance detection result of each area displayed separately on the screen 4. Further, the CPU 15 has a function of detecting, in addition to the X-ray film insertion detection unit 11, which region on the screen 4 is inserted into the X-ray film F.

The electronic image storage means 20 stores X-ray electronic image data, and is, for example, an HDD device or a semiconductor memory.
The display unit 24 displays information such as the control contents in the CPU 15 and the like, and is a liquid crystal panel, an external monitor, or the like. The display unit 24 may share the screen 4.
The input means 25 is, for example, a keyboard, a remote controller, a touch panel, a button installed on the housing, or the like. The input unit 25 mainly displays information indicating which divided display area on the screen 4 to be used as the shearus ten (hereinafter referred to as “shakersten function realization area information”), an X-ray electronic image is displayed on the screen 4. Information indicating which of the upper divided display areas (hereinafter referred to as “electronic image display function realization area information”) and information for specifying the X-ray image (hereinafter referred to as “electronic image file information”) are input. The
With the above configuration, the projection display apparatus 100 realizes a large screen and high-precision display on the screen 4, and arbitrarily displays the display area divided into the three areas of the screen 4 in the Schaukasten or electronic image display apparatus. Can be used as
For convenience of explanation, the luminance detection sensor 5, the X-ray film holding means 6, the X-ray film insertion detection sensor 7, and the X-ray film F are shown in a larger size. It is not limited to.

<Operation of projection display device>
Next, a general operation of the projection display apparatus 100 according to the first embodiment of the present invention will be described. Here, as shown in FIG. 3, the screen 4 is divided into three areas, and the middle display area (area B in FIG. 3) of the screen 4 is made to function as an X-ray electron image display area, so that both ends are displayed separately. A case where the area (areas A and C in FIG. 3) is made to function as the shear sten will be described as an example.
First, the input unit 25 designates the Sharksten function realization area as the divided display areas A and C at both ends of the screen 4, and designates the electronic image display function realization area as the middle divided area B of the screen 4.
Next, electronic image file information for specifying the X-ray electronic image to be displayed in the split display area B in the middle of the screen is input by the input means 25.
The CPU 15 receives the information from the input means 25, reads out the X-ray electronic image data specified by the electronic image file information from the electronic image storage means 20, and based on the electronic image data, through the screen display control means 21, The light emitted from the illumination optical system 31 is changed to modulated light based on electronic image data by changing the transmittance of the middle part of the display element 32 (the part corresponding to the divided display area B in the middle on the screen 4). And output to the projection lens 2. This light is reflected by the folding mirror 3 and projected onto the middle divided display region B on the screen 4 where it is displayed as an X-ray electron image.

On the other hand, the CPU 15 performs control so that the transmittance is uniform at both end portions of the display element 32 via the screen display control means 21, and the light emitted from the illumination optical system 31 is white light as backlight light. To the projection lens 2. This light is reflected by the folding mirror 3 and projected onto the divided display areas A and C at both ends on the screen 4, where it is displayed as a surface light source as a shark caster.
As described above, the projection display apparatus 100 can cause the divided display area B in the middle of the screen 4 to function as an X-ray electronic image display area, and allow the divided display areas A and C at both ends of the screen 4 to function as Sharksten areas. .
<Brightness adjustment>
Next, the brightness adjustment operation will be described. FIG. 4 shows an operational flowchart of the brightness adjustment of the projection display apparatus 100 according to the first embodiment of the present invention. Here, a case where the screen 4 is divided into three will be described as an example.
When the X-ray film F is inserted into the X-ray film holding means 10, information output from the X-ray film insertion detection means 11 (hereinafter referred to as “X-ray film insertion information”) is received, and the presence / absence of X-ray film insertion is determined. Determine (S101). If no X-ray film is inserted, the brightness adjustment operation is not executed.

On the other hand, when the X-ray film F is inserted into the screen 4, in any of the divided display areas of the divided display area on the screen 4 according to the X-ray film insertion information output from the X-ray film insertion detection means 11 in step S 101. It is determined whether the X-ray film F is inserted, and the information (hereinafter referred to as “X-ray film insertion area information”) is held.
In step S101, it is monitored whether or not instruction information for displaying a new X-ray electronic image (hereinafter referred to as “X-ray electronic image display instruction information”) is input from the input means 25. The presence / absence of electronic image display instruction information is determined. This instruction information is held in the RAM 17. When there is no X-ray electronic image display instruction information, the brightness adjustment operation is not executed.
As described above, in this apparatus, the brightness adjustment operation is executed only when the X-ray film is inserted or when a new X-ray electronic image display instruction is issued. Thereby, unnecessary luminance adjustment can be prevented.
When an X-ray film is inserted or when there is an instruction to display a new X-ray electronic image, a counter value n for counting the number of brightness adjustment operations is initialized (n = 0) ( S102) Every time the brightness adjustment operation is started, the counter value n is incremented, and the counter value n is held (S103).

Next, it is determined whether or not the counter value n exceeds a certain value nth (S104). If the counter value n exceeds the certain value nth, it is determined that the brightness cannot be adjusted accurately, and a warning display to that effect is displayed ( S106). This warning display is performed by displaying on the display means 24 or the screen 4. The value of nth may be set in advance, or may be input from the input means 25 by the operator at the time of use.
When the counter value n does not exceed the predetermined value nth, the luminance value corresponding to each divided display area of the screen 4 divided into three is acquired from the output from the luminance detection sensor 5 and the information from the luminance detection means 10. (S105).
Next, it is determined from the X-ray film insertion area information whether or not the luminance value acquired in step S105 is that of the divided display area on the screen 4 into which the X-ray film is inserted (S107). Then, if the luminance value is in the divided display area where the X-ray film is inserted, the acquired luminance value is set as the determination value A (S109), and the divided display area where the X-ray film is not inserted is set. If it is, the value corrected by the following equation is set as the determination value A (S108), and this value is held.
A = (luminance value) B + C
The reason why the correction is performed by the above formula is as follows.

That is, the divided display area on the screen 4 in which the X-ray film is inserted and used as the Schaukasten is controlled to be divided so that the entire corresponding area on the display element 32 is uniform with high transmittance. On the other hand, the divided display area on the screen 4 displaying the electronic image is subjected to divided display control so that electronic image light modulated with reference to the electronic image data corresponding to the display element 32 is generated. Yes. Therefore, the divided display area on the screen 4 displaying the electronic image is transmitted through the display element 15 and less in the amount of light projected on the screen 4 than the divided display area used as the schacus ten. For this reason, it is necessary to correct by the above formula so as to realize accurate brightness adjustment.
Next, the minimum value of the A value of each divided display area on the screen 4 divided into three is substituted for the min value, and the divided display area information indicating the divided display area where the A value is the minimum is substituted for the ryouiki value. , Keep those values. Then, it is determined whether or not the difference between the A value and the min value of each divided display area on the screen 4 is equal to or less than the threshold value th (S111). If it is not less than or equal to the threshold th, the luminance adjustment is executed so that the luminance values other than the divided display area on the screen 4 corresponding to the ryouiki value match the min value.
That is, control is performed to reduce the transmittance of the area on the display element 32 of the optical driving unit 1 corresponding to the divided display area other than the divided display area on the screen 4 corresponding to the ryouiki value (S112). For example, if the A value of the middle divided display area of the screen 4 divided into three is a min value, the upper and lower two areas of the display element 32 other than the middle divided into three (3 of the display element 32 in FIG. 2). The upper and lower areas of the divided areas correspond to this.)

Note that the value of th is, for example, 15 [cd / m ² ] within 5% of each divided display area luminance.
The value of th may be set in advance or may be input from the input unit 25 by the operator.
Thereafter, the processing from step S103 is repeatedly executed. If it is determined in step S111 that the threshold value is equal to or less than the threshold value th, the luminance adjustment is completed. In this way, by setting the threshold value th and adjusting the brightness so that the threshold value is less than or equal to this threshold value, it is possible to prevent the number of times of the brightness adjustment from being excessively increased, and it is possible to perform accurate brightness adjustment. .
As described above, the surface light source (Shakarsten) function and the electronic image display function for the X-ray film can be realized in an arbitrary area of the divided display area of the screen 4, and the luminance of the divided display area on the screen 4 is adjusted. This makes it easy to compare the X-ray film and the X-ray electron image.
[Second Embodiment]
<Overall configuration of projection display device>
FIG. 5 shows an overall configuration diagram of a projection display apparatus 100 according to the second embodiment of the present invention. The projection display device 100 ′ has a function that can be used as, for example, a screen having a size capable of taking a plurality of display areas of 20 inches or more, and can also be used as a shakasten. This is the same as the projection display device according to the first embodiment. And only the following points differ from the apparatus of 1st Embodiment.

(1) The brightness detection sensor 5 is outside the housing 12 of the projection display device 100 ′, and the white 100% brightness detection sensor 52 for white 100% brightness and the white 0% brightness for white 0% brightness. It is composed of two types of detection sensors 51.
(2) The housing 12 of the projection display device 100 ′ has a luminance detection hole 53 in an area irradiated with the reflected light from the folding mirror 3. The brightness detection hole 53 is installed in the vicinity of the upper end of the screen 4 as shown in FIG.
The white 0% luminance detection sensor 51 and the white 100% luminance detection sensor 52 are connected to the luminance detection means 10, and outputs are input to the luminance detection means 10.
<X-ray film used in projection display devices>
The first X-ray film F1 and the second X-ray film F2 used in the projection display apparatus 100 ′ according to the second embodiment of the present invention will be described with reference to FIGS.
In FIG. 5, the X-ray film holding means 6 is installed on the upper part of the screen 4. When the X-ray film F is inserted into the X-ray film holding means 6, there is a portion (hereinafter referred to as “X-ray film insertion region”) that is covered with the X-ray film holding means 6 at the upper end portion of the X-ray film F. An X-ray film having a test pattern on this portion is shown in FIGS.

The X-ray film F1 with the first test pattern shown in FIG. 6 has a portion taken at 100% white brightness in one half area of the X-ray film insertion area and 0% white in the other half area. It has a luminance imaged part.
The X-ray film F2 with the second test pattern shown in FIG. 7 has a plurality of portions photographed with a luminance of 100% white and portions photographed with a luminance of 0% white in the X-ray film insertion region.
The light from the luminance detection hole 53 is transmitted through the portion photographed with the luminance of 100% white and the portion photographed with the luminance of 0% white of the X-ray film F1 with the first test pattern or the X-ray film F2 with the second test pattern. Thereafter, the luminance is measured by the white 100% luminance detection sensor 52 and the white 0% luminance detection sensor 51.
As shown in FIGS. 6 and 7, the white 100% luminance detection sensor 52 and the white 0% luminance detection sensor 51 transmit light of a portion photographed at a luminance of 100% white and a portion photographed at a luminance of 0% white, respectively. It is installed at a position where can be measured.
When corresponding to the X-ray film F1 with the first test pattern, for example, a white 0% luminance detection sensor 51 and a white 100% luminance detection sensor 52 are installed at the positions shown in FIG.

In FIG. 8, the white 0% luminance detection sensor 51 and the white 100% luminance detection sensor 52 are present under the X-ray film holding means 10 and are not visible from the front, but for the sake of clarifying the positional relationship. It is described as in FIG.
<X-ray electron images used in projection display devices>
When the X-ray electronic image is displayed in the divided display area on the screen 4, the same X-ray electron image as the pattern existing in the X-ray insertion area of the X-ray film shown in FIGS. A photographed electronic image having a white 100% luminance portion and a white 0% luminance portion (hereinafter, referred to as “electronic image with a test pattern”) is displayed.
As a result, when displaying an electronic image with a test pattern and when inserting an X-ray film with a test pattern, the state of light that has passed through the luminance detection hole is approximated. It is possible to improve the accuracy of luminance adjustment between the divided display area on the screen 4 being displayed and the divided display area on the screen 4 used as the schacus ten.
In addition, it is possible to clearly grasp the dynamic range (range from white 0% luminance level to white 100% luminance level) during radiograph film shooting and the dynamic range during radiograph electronic image capture, so that high-accuracy luminance can be obtained. It is easy to make adjustments.

<Operation of projection display device>
Since the operation of the projection display apparatus 100 according to the present invention for displaying on the screen 4 the operation for realizing the X-ray electronic image display function and the Schaukasten function in the divided display area on the screen 4 is the same as in the first embodiment, description will be given. Is omitted.
<Brightness adjustment>
With reference to FIG. 9, the brightness adjustment operation of the projection display apparatus 100 according to the second embodiment of the present invention will be described. FIG. 9 is an operation flowchart of brightness adjustment of the projection display apparatus 100 according to the second embodiment of the present invention. Here, the case where the screen 4 is divided into three will be described.
First, it is determined whether or not the X-ray film F has been inserted into the X-ray film holding means 6 (S201). If no X-ray film is inserted, the brightness adjustment operation is not executed. When the X-ray film is inserted, in this step S201, it is determined in which divided display area of the divided display area on the screen 4 the X-ray film F is inserted, and the information is retained.
In step S201, along with the determination of the insertion of the X-ray film F, it is monitored whether the X-ray electronic image display instruction information is input from the input means 25, and the presence or absence of the X-ray electronic image display instruction information is determined (S201). ). When there is no X-ray electronic image display instruction information, the brightness adjustment operation is not executed.

As described above, the luminance adjustment operation is executed only when an X-ray film is inserted or when a new X-ray electronic image display instruction is issued. Thereby, unnecessary luminance adjustment can be prevented.
When the X-ray film is inserted, or when there is an instruction to display a new X-ray electronic image, a counter value n for counting the number of brightness adjustment operations is initialized (n = 0) ( (S202) The counter value n is incremented every time the brightness adjustment operation is started, and the counter value n is held (S203).
Next, it is determined whether or not the counter value n exceeds a certain value nth (S204). If the counter value n exceeds the certain value nth, it is determined that the brightness adjustment cannot be performed accurately, and a warning display to that effect is displayed. An instruction is given (S205). This warning display is performed by displaying on the display means 24 or the screen 4. Note that the value of nth may be set in advance, or may be input from the input means 25 by the operator during use.
Next, whether or not the divided display area on the screen 4 is an area in which the X-ray film is inserted is determined based on the X-ray film insertion area information (S206), and is the divided display area in which the X-ray film is not inserted. If it is determined, the above-described electronic image with a test pattern is displayed in the divided display area. Thereby, the light modulated by the data of the electronic image with the test pattern is generated by controlling the optical driving unit 1, and the modulated light is irradiated onto the divided display area on the screen 4 (S207).

On the other hand, when it is determined that the divided display area is an X-ray film, the backlight is projected onto the divided display area on the screen 4 so that the divided display area becomes a surface light source. . This is executed by controlling the optical drive unit 1 so as to emit white light that is not modulated.
Next, in each divided display area on the screen 4, the brightness value detected by the white 100% brightness detection sensor 52 is set as the value of the number of white 100% brightness detection sensors 52 as kido_w100 values, and the white 0% brightness detection sensor. The brightness values detected by 51 are set as kido_w0 values for the number of white 0% brightness detection sensors 51, and these values are held (S208).
Then, the minimum value of the kido_w100 value corresponding to the number of white 100% luminance detection sensors 52 in each divided display area on the screen 4 is obtained, the value is set as the min_w100 value, and the divided display area where the min_w100 value is the smallest. Is set to the value of ryouiki_w100, and those values are held (S209).
Next, it is determined whether or not the difference between the kido_w100 value and the min_w100 value of each divided display area is less than or equal to a threshold value th_w100 value (S210). If it is not less than or equal to the th_w100 value, divided display of the screen 4 corresponding to the ryouiki_w100 value is performed. The brightness adjustment is executed so that the brightness values outside the region are matched with the min_w100 value. Thereby, control is performed to reduce the transmittance of the area on the display element 32 of the optical drive unit 1 corresponding to the divided display area other than the divided display area on the screen 4 corresponding to the value of ryouiki_w100 (S211).

Thereafter, the processing from step S203 is repeatedly executed, and if the difference between the kido_w100 value and the min_w100 value of each divided display area is equal to or less than the th_w100 value, the minimum value of the kido_w0 value of each divided display area on the screen 4 is obtained. The value is set to the min_w0 value, the maximum value of the kido_w0 value of each divided display area on the screen 4 is obtained, and the value is set to the max_w0 value. Then, a value obtained by subtracting the min_w10 value from the max_w0 value is set as the diff_w0 value, and the value is held (S212).
Next, it is determined whether or not the diff_w0 value is smaller than the threshold value th_min (S213). If the diff_w0 value is smaller than the th_min value, the luminance adjustment operation is terminated. On the other hand, if the diff_w0 value is not smaller than the th_min value, it is determined that the brightness cannot be adjusted, an instruction to display a warning to that effect is given (S214), and the brightness adjusting operation is terminated.
By performing the above processing, the level of white 100% of the luminance value of each divided display area on the screen 4 is within a certain range (within the range indicated by the threshold th_w100), and each division on the screen 4 is performed. Since the white 0% level of the luminance value of the display area is within a certain range (within the range indicated by the threshold value th_min), it is possible to eliminate a comparison in the case where the difference in dynamic range is large and there is a possibility of misdiagnosis. .

The value of th_w100 is 15 [cd / m ² ].
The value of th_w100 may be set in advance, or may be input from the input unit 25 by the operator during use.
As described above, the surface light source function and the electronic image display function for the X-ray film can be realized in an arbitrary divided display area of the divided display area of the screen 4, and the luminance of the divided display area on the screen 4 can be adjusted. Thereby, the X-ray film and the X-ray electron image can be easily compared.
Also, in both X-ray film and X-ray image, a test pattern of 100% white brightness and 0% white brightness is shot at the time of shooting, and the dynamic range of the tonality value of the X-ray film and X-ray electronic image is set based on this test pattern. Since the brightness adjustment of each divided display area on the screen 4 in consideration is performed, comparison between X-ray films with higher accuracy, comparison between X-ray electronic images, and comparison between X-ray films and electronic images can be performed.
In addition, when there is a variation in the dynamic range of each divided display area on the screen 4 and a misdiagnosis is induced by comparative diagnosis, a warning is displayed, so that comparative diagnosis can be performed with peace of mind.

[Other Embodiments]
(A) As shown in FIG. 10, the optical drive unit 1 may be configured to use three display elements 32r, 32g, and 32b. In this case, the light from the light source 30 and the illumination optical system 31 is decomposed into RGB light by the first dichroic mirror 40, the second dichroic mirror 41, and the three total reflection mirrors 42, 43, and 44. The display elements 32r, 32g, and 32b are used for R component, G component, and B component, respectively. The light passing through the three display elements is collected by the dichroic prism 45 and emitted to the projection lens 2.
When three display elements are used as described above, the same control may be performed for the divided display areas on the screen 4 and the corresponding areas of the three display elements 15.
(B) As shown in FIG. 11, the luminance detection sensor 5 may be arranged in a region where the reflected light of the screen 4 is irradiated. In this case, the space for arranging the luminance detection sensor 5 can be reduced. For example, the length of X2 in FIG. 11 can be made smaller than the length of X1 in FIG. be able to. The operation of the projection display device and the brightness adjustment operation are the same as in the first embodiment.
(C) In each of the above-described embodiments, a transmissive display element is used as a display element. However, a projection display apparatus may be configured using a reflective display element.

  (D) In each of the above-described embodiments, the rear-type projection display device using the folding mirror has been described. However, a projection-type display device that does not use the folding mirror may be used. In this case, the light emitted from the projection lens is directly projected on the screen.

  The projection display device according to the present invention is useful in the medical-related industrial field because it can realize high-accuracy and accurate comparison and judgment of X-ray films and medical image images, and the projection display device according to the present invention. Can be implemented in the art.

1 is an overall configuration diagram of a projection display device according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of an optical drive unit and a projection lens of the projection display device. 1 is a front view of a projection display device according to a first embodiment of the present invention. 6 is a brightness adjustment operation flow of the projection display apparatus according to the first embodiment of the present invention. The whole block diagram of the projection type display apparatus which concerns on 2nd Embodiment of this invention. The X-ray film which concerns on 2nd Embodiment of this invention. The X-ray film which concerns on 2nd Embodiment of this invention. The front view of the projection type display apparatus which concerns on 2nd Embodiment of this invention. The brightness adjustment operation | movement flow of the projection type display apparatus which concerns on 2nd Embodiment of this invention. The block diagram of the optical drive part and projection lens of the projection type display apparatus which concerns on other embodiment of this invention. The whole block diagram of the projection type display apparatus which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical drive part 2 Projection lens 3 Folding mirror 4 Screen 5 Luminance detection sensor 51 White 0% luminance detection sensor 52 White 100% luminance detection sensor 53 Luminance detection hole 6 X-ray film holding means 7 X-ray film insertion sensor 10 Luminance detection means 11 X-ray film insertion detection means 15 CPU
16 ROM
20 Electronic image storage means 21 Screen display control means 24 Display means 25 Input means 30 Light source 31 Illumination optical system 32, 32r, 32g, 32b Display element 100 Projection display device F X-ray film F1 X-ray film F2 with first test pattern X-ray film with second test pattern

Claims (12)

An optical drive unit that includes a light source and emits light modulated by an image signal, or white light as backlight light;
A projection lens for enlarging the light emitted from the optical drive unit;
A screen on which light from the projection lens is projected;
On the screen, divided display control means for controlling the optical drive unit so as to display an image divided into a plurality of display areas;
A luminance detector that detects the luminance of each of the plurality of display areas on the screen;
Brightness adjusting means for adjusting the brightness of each display area on the screen based on the detection result of the brightness detecting unit;
A projection display device comprising:   The projection display device according to claim 1, further comprising a folding mirror that reflects the light emitted from the projection lens and projects the light onto the screen.   The projection display device according to claim 1, further comprising electronic image storage means for storing electronic image data serving as a reference of the image signal. The optical drive unit is
An illumination optical system for collecting the light emitted from the light source;
A display element that modulates light from the illumination optical system by changing the transmittance based on an image signal;
The projection display device according to claim 1, further comprising: X-ray film holding means arranged on the outer periphery of the screen and holding the X-ray film on the screen;
X-ray film insertion detecting means for detecting in which area on the plurality of divided display areas on the screen the X-ray film has been inserted, and
The brightness adjusting means performs brightness adjustment when the X-ray film is inserted,
The projection display device according to claim 1. A housing that houses the optical drive unit, the projection lens, and the screen;
The luminance detection unit includes a luminance detection sensor and luminance detection means, and the sensor is disposed inside the housing.
The projection display device according to claim 1. The sensor is disposed in a region irradiated with reflected light from the screen.
The projection display device according to claim 1. The housing has a hole provided in a region irradiated with reflected light from the folding mirror,
The sensor is disposed in a region irradiated with the reflected light through the hole,
The projection display device according to claim 1. The luminance adjusting means determines a minimum luminance value from the luminance values of the respective divided display areas of the screen acquired by the luminance detection unit, and determines which divided display area of the screen the minimum luminance value belongs to. To determine the minimum luminance value area information to be shown,
The divided display control means controls the transmittance of the corresponding area of the display element corresponding to the divided display area other than the divided display area of the screen indicated by the minimum luminance value area information in a direction approaching the minimum luminance value. Is,
The projection display device according to claim 1.   The projection display device according to claim 1, wherein the luminance detection unit includes a plurality of sensors provided in each of the plurality of divided display areas of the screen. An X-ray film to be inserted into the X-ray film insertion region of the projection display device according to claim 1,
In a region smaller than the X-ray film insertion region, a first portion photographed with a luminance of 100% white and a second portion photographed with a luminance of white 0%,
X-ray film. An X-ray film to be inserted into the X-ray film insertion region of the projection display device according to claim 1,
A plurality of first portions photographed at a luminance of 100% white and a plurality of second portions photographed at a luminance of 0% white in an area smaller than the X-ray film insertion region;
X-ray film.

Images