JP2005258087A - Screen panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screen panel capable of preventing malfunction in using an optical pointing device on a panel surface. <P>SOLUTION: The screen panel for displaying a picture 41 based on projected light Lp projected from the back side of a top board 4 is equipped with an infrared cut filter 4d disposed on the top board 4 and attenuating light in an infrared region detected by an optical mouse 11 out of the projected light Lp. In such a case, the screen panel is equipped with leg parts 2, 2... for supporting the top board 4 while the panel surface of the top board 4 turns upward. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screen panel for projecting projection light from the back to display an image.

  As this type of screen panel, a transmissive projection screen disclosed in Japanese Patent Application Laid-Open No. 2003-215716 is known. As shown in FIG. 1 of the publication, this transmissive projection screen is configured such that an image can be displayed on the panel surface (front surface) side by projecting light emitted from an optical engine (projector) from the back surface side. Has been.

On the other hand, an optical mouse is generally known as an input device (pointing device) for a computer or the like. As an example, this type of optical mouse includes a light source (light emitting diode), a photoelectric conversion element (sensing unit), and the like as disclosed in Utility Model Registration No. 3087737. In this optical mouse, light emitted from a light source is reflected by a reflecting surface, and the reflected light is photoelectrically converted by a photoelectric conversion element.
JP 2003-215716 A (page 3, FIG. 1) Utility Model Registration No. 3087737 (pages 10-12, Fig. 3)

  However, when a conventional screen panel (transmission type projection screen) is used and an optical mouse is used on the panel surface of the screen panel, the following problems occur. That is, the photoelectric conversion element of the optical mouse detects light in a predetermined wavelength region emitted from the light source of the optical mouse and performs photoelectric conversion. However, the photoelectric conversion element sometimes detects not only light in a predetermined wavelength region but also light close to the predetermined wavelength region to perform photoelectric conversion. On the other hand, in the conventional screen panel, when projection light is emitted, an image based on the projection light is displayed on the panel surface of the screen panel, and diffused light diffused by the screen panel is emitted from the panel surface side. At this time, the light emitted from the panel surface of the screen panel may include light in a wavelength region close to a predetermined wavelength region that can be detected by the photoelectric conversion element of the optical mouse. In this case, the photoelectric conversion element detects and photoelectrically converts not only the light emitted from the light source of the optical mouse but also the light emitted from the panel surface of the screen panel. For this reason, when an optical mouse is used on a conventional screen panel, the optical mouse malfunctions due to photoelectric conversion of light emitted from the panel surface. There is a problem of fear.

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a screen panel that can prevent malfunction when an optical pointing device is used on the panel surface.

  In order to achieve the above object, a screen panel according to the present invention is a screen panel that displays an image based on projection light projected from the back side of the screen panel body, and is disposed on the screen panel body to provide the projection light. The filter part which attenuates the light of the main wavelength range detected by the optical pointing device of these is provided.

  In this screen panel, the filter unit attenuates light in the main wavelength region detected by the optical pointing device in the projection light. Therefore, according to this screen panel, for example, when the optical pointing device is used on the panel surface of the screen panel in the rear projector, the photoelectric conversion element of the optical pointing device detects the light emitted from the panel surface. As a result of being able to be sufficiently prevented, it is possible to reliably prevent malfunction when using the optical pointing device on the panel surface of the screen panel.

  In addition, a screen panel according to the present invention includes a support column that supports the screen panel body with the panel surface of the screen panel body facing upward in the screen panel.

  According to this screen panel, a table-type screen panel can be configured by supporting the screen panel body in a state in which the support columns face the panel surface upward. Therefore, it is possible to use the optical pointing device on the panel surface while displaying an image on the panel surface of the screen panel.

  The screen panel according to the present invention is the above-described screen panel, wherein the filter portion is formed in a layered manner, and the back surface of the screen panel body, the panel surface of the screen panel body, and the screen panel body. It is arrange | positioned in either inside.

  According to this screen panel, the screen panel can be thinned by forming the filter portion in layers.

  In the screen panel according to the present invention, in the above-described screen panel, the filter section includes at least one of a dielectric multilayer filter, a holographic filter, a color glass filter, and a gelatin filter.

  According to this screen panel, the filter unit can surely attenuate the light in the main wavelength region detected by the optical pointing device, so that a malfunction occurs when the optical pointing device is used on the panel surface of the screen panel. Can be reliably prevented.

  In the screen panel according to the present invention, the main wavelength region is defined as an infrared region in the screen panel.

  According to this screen panel, since the filter unit attenuates the light in the infrared region and allows the light in the visible region to pass through, the image can be displayed on the panel surface of the screen panel without affecting the color of the image. it can.

  Hereinafter, the best mode of a screen panel according to the present invention will be described with reference to the accompanying drawings.

  First, the configuration of a table type display device 1 (rear projector) to which the screen panel according to the present invention is applied will be described with reference to the drawings. A table type display device 1 shown in FIG. 1 includes four legs 2, 2,..., A shelf board 3, a top board 4, and an optical engine 5, and is configured in a table shape. Each leg portion 2 corresponds to a support column in the present invention, and is formed as a column with steel as an example. The shelf plate 3 is fixed to the lower portion and the top plate 4 is fixed to the upper end portion. Support both. As an example, the shelf board 3 is formed of steel into a rectangular plate shape, and the optical engine 5 is installed at the center, and the computer 10 and the like connected to the optical engine 5 are placed thereon.

  The top plate 4 corresponds to the screen panel body in the present invention, and includes a glass plate 4a, a lenticular lens 4b, a Fresnel lens 4c, and an infrared cut filter 4d as shown in FIG. 1, and functions as a display surface to display an image. It is configured to be possible. In this case, as an example, the glass plate 4a is formed into a rectangular plate shape with a light-transmitting tempered glass, and writing or the like can be performed on the upper surface (corresponding to the panel surface in the present invention). It is configured to be able to. The lenticular lens 4b is formed in, for example, a rectangular plate shape slightly smaller than the top plate 4, and is fixed to the lower surface of the glass plate 4a. The Fresnel lens 4c is formed in a plate shape having the same shape as the lenticular lens 4b, for example, and is fixed to the lower surface of the lenticular lens 4b. The Fresnel lens 4c converts the projection light Lp projected from the lower surface side into parallel light, and the lenticular lens 4b converts the projection light Lp converted into parallel light by the Fresnel lens 4c into light La (diffuse light). The image 41 is displayed by (diffusion). In this case, the light La in the visible region diffused by the lenticular lens 4b passes through the glass plate 4a and is emitted upward from the display surface. The infrared cut filter 4d is fixed to the lower surface of the Fresnel lens 4c. The infrared cut filter 4d is, for example, a glass substrate formed in a rectangular plate shape substantially the same as the Fresnel lens 4c, and a dielectric multilayer filter corresponding to the filter portion in the present invention. It is composed of a dielectric multilayer film coated in layers on the surface of the material on the Fresnel lens 4c side. Therefore, the top plate 4 is thinned because the dielectric multilayer film (infrared cut filter 4d) is formed in layers. In this case, the infrared cut filter 4d has a visible region (as an example, 350 nm or more) of light projected from the lower surface (the surface on the glass substrate side in the drawing and corresponds to the “rear surface” in the present invention). Light in the wavelength region of 700 nm or less) and light in the main wavelength region detected by the optical mouse 11 (for example, light in the infrared region of at least 750 nm or more and 850 nm or less) is attenuated.

  The optical engine 5 includes a liquid crystal light valve as an example. As shown in FIG. 1, the optical engine 5 is connected to a computer 10 serving as an image data output device, and optically modulates based on image data output from the computer 10. The projection light Lp is projected toward the top plate 4. In this case, as an example, the computer 10 is a notebook personal computer as shown in the figure, and includes an optical mouse 11 as an input device. The optical mouse 11 is an example of the optical pointing device in the present invention, and transmits data to and from a receiving unit (not shown) provided in the computer 10 in a wireless manner. In addition, as shown in FIG. 2, the optical mouse 11 includes a light detection unit 12 inside the bottom surface. The light detection unit 12 includes an LED 13 that emits irradiation light Ld in the infrared region toward the lower side (bottom side), a lens 14 that collects reflected light Ls of the irradiation light Ld emitted from the LED 13, and a lens. 14 detects a relative position change of the optical mouse 11 based on the photoelectric conversion element 15 that photoelectrically converts the reflected light Ls collected by 14 and the electric signal output from the photoelectric conversion element 15. And a control IC 16 that generates position information obtained by converting the change into data and outputs the position information to the computer 10. In this case, the photoelectric conversion element 15 has a peak of detection sensitivity in the infrared region (“main wavelength region” in the present invention. As an example, the wavelength region of 750 nm or more and 850 nm or less).

  Next, the overall operation of the table type display device 1 will be described with reference to the drawings, with an example in which the computer 10 is connected to the optical engine 5. For example, when displaying an image on the table-type display device 1, the computer 10 outputs image data corresponding to the image displayed on the display panel 10 a (see FIG. 1) to the optical engine 5 in accordance with the operation of the operator. At this time, it is assumed that, as an example, an image (not shown) of one scene of a card game in which a plurality of playing card images are arranged is displayed on the display panel 10a. Next, the optical engine 5 projects the projection light Lp light-modulated based on the image data output from the computer 10 toward the top 4 (infrared cut filter 4d). At this time, the infrared cut filter 4d mainly passes the visible region light toward the Fresnel lens 4c while attenuating the infrared region light of the projection light Lp projected from the optical engine 5. Subsequently, the Fresnel lens 4c converts the projection light Lp mainly in the visible region containing almost no light in the infrared region into parallel light. Next, as shown in FIG. 1, the projection light Lp converted into parallel light by the lenticular lens 4b is converted (diffused) into light La (diffused light), and the glass plate 4a transmits the light La (that is, its upper surface). .. Is emitted in color, and the image 41 (see FIG. 4) including the playing cards 42, 42,... Similar to the image displayed on the display panel 10a of the computer 10 is displayed in color. It is visually recognized from the upper surface side of the plate 4. In this case, since the infrared cut filter 4d attenuates light in the infrared region, light La that hardly contains light in the infrared region is emitted from the top plate 4 (glass plate 4a).

  On the other hand, when the optical mouse 11 is operated on the top 4, as shown in FIG. 2, the irradiation light Ld in the infrared region emitted from the LED 13 in the light detection unit 12 in the optical mouse 11 is emitted from the top 4. The reflected light Ls is collected by the lens 14 and enters the photoelectric conversion element 15. Further, the light La that has passed through the top 4 is also collected by the lens 14 and enters the photoelectric conversion element 15. In this case, since the light La contains almost no light in the infrared region, the photoelectric conversion element 15 mainly photoelectrically converts the reflected light Ls in the infrared region. Therefore, the control IC 16 is relatively unaffected by the light La emitted from the top plate 4 and is based on the electrical signal obtained by photoelectrically converting the reflected light Ls reflected by the top plate 4. The position change is accurately detected and the position information is output to the computer 10. Therefore, when the optical mouse 11 is moved in the direction indicated by the arrow in FIG. 3, the position information is output to the computer 10, and the computer 10 places the pointer 43 on the display panel 10a in the same direction as the arrow. Move. At this time, the computer 10 outputs the image data to the optical engine 5, and the optical engine 5 projects the projection light Lp for displaying the same image 41 as the image displayed on the display panel 10a based on the image data. . As a result, as shown in the figure, the image 41 in which the pointer 43 moves in the direction of the arrow shown in the figure is visually recognized from the upper surface side of the top board 4 as in the image displayed on the display panel 10a of the computer 10. The

  Thus, in this table type display device 1, the infrared cut filter 4d of the top plate 4 attenuates light in the main wavelength region (light in the infrared region) detected by the optical mouse 11 in the projection light Lp. Let Therefore, when the optical mouse 11 is used on the upper surface (panel surface) of the top plate 4, detection of the light La emitted from the top plate 4 by the photoelectric conversion element 15 of the optical mouse 11 is sufficiently prevented. As a result, it is possible to reliably prevent malfunction when the optical mouse 11 is used on the top surface of the top plate 4.

  Further, the leg portion 2 supports the top plate 4, whereby the table type display device 1 having a table type screen panel can be configured. Therefore, the optical mouse 11 can be used on the upper surface (panel surface) while displaying the image 41 on the top plate 4 as a screen panel.

  Further, since the infrared cut filter 4d attenuates the light in the infrared region and passes the light La in the visible region, the image 41 is displayed on the top plate 4 of the table type display device 1 without affecting the color of the image 41. can do.

  In addition, this invention is not limited to said structure. For example, the configuration example in which the infrared cut filter 4d is disposed on the lower surface side of the top plate 4 has been described. However, the infrared cut filter 4d is disposed on the inner surface of the top plate 4 (between the glass plate 4a and the lenticular lens 4b). A configuration or a configuration in which the infrared cut filter 4d is disposed on the upper surface of the glass plate 4a may be employed. Moreover, the structure which forms a dielectric multilayer on the upper surface or lower surface of the glass plate 4a, ie, the structure using the glass plate 4a instead of the glass base material of the infrared cut filter 4d, can also be employ | adopted. Moreover, the top plate 4 can also be comprised with the lenticular lens 4b, the Fresnel lens 4c, and the infrared cut filter 4d, without using the glass plate 4a.

  In addition, the example in which the infrared cut filter 4d is configured using a dielectric multilayer filter has been described above. However, a holographic filter, a colored glass filter, and a gelatin filter are used instead of the dielectric multilayer filter or together with the dielectric multilayer filter. The infrared cut filter 4d can also be configured using at least one of the above. Further, the screen panel according to the present invention may be applied to a display device including various types of optical engines having a DMD (digital micromirror device) or a reflective light modulation element instead of a transmissive liquid crystal light valve. it can.

  Further, the configuration example using the infrared cut filter 4d for attenuating the infrared region has been described. When the main wavelength region detected by the photoelectric conversion element 15 of the optical mouse 11 is a wavelength region different from the infrared region, Of course, a filter that attenuates the main wavelength region that is mainly detected by the photoelectric conversion element 15 can be employed.

  Further, the screen panel according to the present invention can be formed in any shape and size. For example, by forming a top plate as a screen panel in a circular shape, it is possible to configure a circular conference desk that allows a plurality of people to sit around and hold a conference. According to this configuration, an image of the conference material is displayed on the top board, and the meeting is performed while all the members visually recognize the image. At that time, the optical mouse 11 can be used on the top surface of the top board. it can. Moreover, it can use for arbitrary uses not only in a meeting. For example, it can be used as a desk-like game machine or as a stock transaction table.

1 is a side view of a table type display device 1. FIG. 3 is a side sectional view of a light detection unit 12 in the optical mouse 11. FIG. 3 is a top view of the table type display device 1. FIG.

Explanation of symbols

  1 table type display device, 2 legs, 4 top plate, 4b lenticular lens, 4c Fresnel lens, 4d infrared cut filter, 5 optical engine, Lp projection light, 11 optical mouse, 41 image

Claims (5)

A screen panel that displays an image based on projection light projected from the back side of the screen panel body,
A screen panel provided with a filter unit disposed in the screen panel main body for attenuating light in a main wavelength region detected by an optical pointing device in the projection light.   The screen panel according to claim 1, further comprising a column that supports the screen panel body with the panel surface of the screen panel body facing upward.   The filter section is formed in a layered manner, and is disposed on any of the back surface of the screen panel body, the panel surface of the screen panel body, and the inside of the screen panel body. The screen panel described.   4. The screen panel according to claim 1, wherein the filter unit is configured by at least one of a dielectric multilayer filter, a holographic filter, a color glass filter, and a gelatin filter.   The screen panel according to claim 1, wherein the main wavelength region is defined in an infrared region.

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