JP2009244412A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type display device, displaying a pseudo three-dimensional image. <P>SOLUTION: This display device includes: a scattering/transmission control type screen 1, which is formed of a light scattering type liquid crystal element 2 and controlled to a scattering state for scattering incident light and a transmission state for transmitting the incident light by applying voltage; image projection means 3a, 3b which display an image and project the image on the screen 1; and a screen driving means 22 which controls a projection area of an image by the image projection means 3a, 3b in the screen 1 to the scattering state and controls the other areas to the transmission state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projection display device.

As a projection-type display device, there is a conventional one provided with a translucent screen, and an image projecting means for displaying an image behind the screen as viewed from the observation side and projecting the image onto the screen (see FIG. Patent Document 1).
Japanese Patent Application Laid-Open No. 8-146891

  However, in the above conventional display device, the image projected on the translucent screen by the image projection means appears on one plane composed of the screen and only displays a two-dimensional planar image.

  An object of the present invention is to provide a projection display device capable of displaying a pseudo-stereoscopic image.

  The display device according to claim 1 of the present invention includes a light scattering type liquid crystal element, and is controlled to be in a scattering state in which incident light is scattered and in a transmission state in which the incident light is transmitted by application of a voltage. A control-type screen, an image projecting means for displaying an image and projecting the image onto the screen, a projection area of the image by the image projecting means of the screen being controlled in the scattering state, and other areas being Screen driving means for controlling the transmission state.

  According to a second aspect of the present invention, in the display device according to the first aspect, the image projecting unit has a projection direction control function of projecting an image on an arbitrary position of the screen, and the screen driving The means drives the screen in response to the control of the projection direction of the image projection means.

  According to a third aspect of the present invention, in the display device according to the first aspect of the present invention, the display device includes a plurality of image projecting units that project images onto different positions of the screen, and the screen driving unit includes the plurality of image The projection area of the image by the projection unit is controlled to be in a scattering state.

  According to a fourth aspect of the present invention, in the display device according to any one of the first to third aspects, a background of an image projected on the screen by the image projecting unit behind the screen as viewed from the observation side. A background display means for displaying is arranged.

  According to a fifth aspect of the present invention, in the display device according to the first aspect, the image projection unit and the background display unit include a single display panel that displays an image projected on the screen and a background. It is characterized by being.

  According to a sixth aspect of the present invention, in the display device according to the fifth aspect, the display panel displays a projected image display unit for displaying an image projected on the screen and a background display for displaying the background. A liquid crystal display element having a portion, and disposed on the opposite side of the liquid crystal display element from the side facing the screen, facing the projection image display unit and the background display unit, and the projection image display unit, A liquid crystal display panel including a plurality of surface light sources that irradiate illumination light toward each of the background display units, wherein the image projection unit faces the projection image display unit and the projection image display unit of the liquid crystal display element The background display means includes a background display unit of the liquid crystal display element and the surface light source facing the background display unit.

  According to a seventh aspect of the present invention, in the display device according to the sixth aspect of the present invention, the surface light source of the image projecting means changes the illumination angle of the illumination light to the projected image display unit of the liquid crystal display element. It is provided so that rotation is possible.

  According to an eighth aspect of the present invention, in the display device according to the seventh aspect, the surface light source of the image projecting unit directs the illumination light consisting of substantially parallel light to the projected image display unit of the liquid crystal display element. It is characterized by irradiating.

  According to a ninth aspect of the present invention, in the display device according to the first aspect, the image projection unit includes a projection image display panel for displaying an image to be projected on the screen, and the background display unit includes: It comprises a background display panel for displaying the background.

  According to a tenth aspect of the present invention, in the display device according to the ninth aspect, the projection image display panel is rotatably provided in a direction in which an angle of the display surface of the display panel with respect to the screen surface is changed. It is characterized by.

  The invention described in claim 11 is the display device according to claim 10, wherein the projection image display panel irradiates light substantially consisting of parallel light toward the screen.

  According to the liquid crystal display element of the present invention, a pseudo-stereoscopic image can be displayed.

(First embodiment)
1 to 7 show a first embodiment of the present invention. FIG. 1 is a perspective view of a display device, and FIG. 2 is a plan view of the display device.

  This display device comprises a light scattering type liquid crystal element 2 such as a polymer dispersion type liquid crystal element, and is controlled in a scattering state in which incident light is scattered and a transmission state in which the incident light is transmitted by application of a voltage. A transmission control type screen 1 and first and second image projecting means 3a that are arranged behind the screen 1 as viewed from the viewing side 30 of the display, display an image, and project the image onto the screen 1. , 3b and screen drive means 22 for controlling the projection areas of the image by the two image projection means 3a, 3b of the screen 1 to the scattering state and the other areas to the transmission state, respectively. A background display unit 4 is disposed behind the screen 1 and displays the background of the image projected on the screen 1 by the image projection units 3a and 3b.

  The light scattering type liquid crystal element 2 is not shown in its configuration, but is a matrix type formed by arranging a plurality of transmission / scattering control units controlled in the scattering state and the transmission state by applying a voltage in a matrix. A liquid crystal layer in which liquid crystal molecules are randomly aligned with a long axis in various directions between a pair of transparent substrates facing each other with a gap (in the case of a polymer dispersed liquid crystal element, a liquid crystal / high A molecular composite layer) is provided, and transparent electrodes for forming the plurality of transmission / scattering control units are provided on the inner surfaces of the pair of substrates facing the liquid crystal layer, respectively, by regions facing each other.

  The light scattering liquid crystal element 2 is driven by applying a voltage between the electrodes of the plurality of transmission / scattering control units, and when a voltage of substantially 0 is applied between the electrodes, the liquid crystal molecules When incident light is scattered by being randomly oriented and a sufficiently high voltage is applied between the electrodes, the liquid crystal molecules are oriented substantially perpendicular to the substrate surface to transmit the incident light.

  The two image projection means 3a and 3b and the background display means 4 are composed of a single display panel, for example, a liquid crystal display panel 5, for displaying the image projected on the screen 1 and the background.

  The liquid crystal display panel 5 includes first and second projection image display units 8a and 8b for displaying an image projected on the screen 1, and a background display unit 9 for displaying the background. One transmissive liquid crystal display element 6 and the opposite side of the liquid crystal display element 6 facing the screen 1 are opposed to the two projected image display parts 8a and 8b and the background display part 9, respectively. A plurality of, ie, three surface light sources 10a, 10b, and 20 that illuminate illumination light toward the projected image display units 8a and 8b and the background display unit 9, respectively. The display surface of the liquid crystal display element 6 is disposed substantially parallel to the screen 1 surface.

  The liquid crystal display element 6 has a screen area 7 having a vertical width approximately equal to the vertical width of the screen 1 and a horizontal width larger than the horizontal width of the screen 1. 7 is a background display unit 9 having a substantially same area as that of the screen 1 in FIG. 1 (a region between two broken lines in FIG. 1), and left and right regions of the background display unit 9 are projected image display units. 8a and 8b.

  The first image projecting unit 3a includes a first projection image display unit 8a of the liquid crystal display element 6 and a surface light source 10a facing the first projection image display unit 8a. The image projection unit 3a includes a first projection image display unit 8a of the liquid crystal display element 6 and a surface light source 10a facing the first projection image display unit 8a. The background display unit 4 includes The liquid crystal display element 6 includes a background display unit 9 and a surface light source 20 facing the background display unit 9.

  The liquid crystal display element 6 supplies a data signal corresponding to an image projected onto the screen 1 between the electrodes of the plurality of pixels of the projection image display units 8a and 8b, and the electrodes of the plurality of pixels of the background display unit 9 Driven by display driving means 21 for supplying a data signal corresponding to the background in between, the image projected on the screen 1 is displayed on the projection image display units 8a and 8b, and the background of the image is displayed on the background display unit 9. Is displayed.

  The display driving unit 21 displays an image projected on the screen 1 on one or both of the first and second projection image display units 8a and 8b of the liquid crystal display element 6, and the background display unit 9 displays the background. Driving to display, driving to display the image on one or both of the first and second projection image display units 8a and 8b, and to hide the background display unit 9, and to the first and second Both the projection image display units 8a and 8b are configured to be non-displayed, and the background display unit 9 is selectively driven to display the background.

  Then, the first projected image display of the three surface light sources 10a, 10b, 20 facing the first and second projected image display units 8a, 8b and the background display unit 9 of the liquid crystal display element 6, respectively. A surface light source (hereinafter, referred to as a first image display surface light source) 10a facing the unit 8a is turned on when the first projection image is displayed on the first projection image display unit 8a, and the second projection image is displayed. A surface light source (hereinafter, referred to as a second image display surface light source) 10b facing the display unit 8b is turned on when the second projection image is displayed on the second projection image display unit 8b, and the background display unit A surface light source 20 (hereinafter referred to as a background light source for background display) 20 facing the light 9 is turned on when displaying the background on the background display unit 9.

  Of the three surface light sources 10a, 10b, and 20, the background display surface light source 20 is fixed at a fixed position, and the first and second projection image display surface light sources 10a and 10b are respectively fixed. , Fixed on turntables 19a and 19b that rotate about a rotation axis (not shown) parallel to the vertical direction of the screen 1, and change the irradiation angle of illumination light to the projection image display units 8a and 8b. It is provided so as to be rotatable in the direction.

  That is, the first and second image projecting units 3a and 3b project the images onto the arbitrary positions in the left and right direction of the screen 1 by the rotation of the projection image display surface light sources 10a and 10b, respectively. It has a control function.

  The screen driving unit 22 controls the screen 1 in response to the control of the projection direction of the first and second image projecting units 3a and 3b, and the first and second image projecting units 3a and 3b. The projection area of the image by 3b, that is, the area of the shape corresponding to the outer shape of the image displayed on the image projection means 3a, 3b is controlled to the scattering state, and the other area is controlled to the transmission state. It is configured.

  Further, the first and second projection image display surface light sources 10a and 10b respectively emit illumination light consisting of substantially parallel light to the first and second projection image display units 8a and 8b of the liquid crystal display element. It is comprised so that it may irradiate toward.

  FIGS. 3 and 4 are an exploded perspective view of a part of the first and second projection image display surface light sources 10a and 10b and a cross-sectional view in which hatching is omitted. A light emitting element array 11 formed by arranging a plurality of solid state light emitting elements 12 such as diodes) in a row direction and a column direction, and arranged on the light emitting side of the light emitting element array 11. A light mask 13 that emits the light beam 18 emitted from the light emitting element 12 by focusing it to a light beam 18a having a predetermined cross-sectional shape, and is arranged on the light emission side of the light mask 13, and is emitted from the plurality of solid light emitting elements 12. The light beam 18a that has passed through the optical mask 13 is corrected to a light beam 18b made of parallel light, and is emitted from the lens array 16.

  The light mask 13 is provided on one surface with a light shielding film 14 in which a plurality of openings 15 having a predetermined shape, for example, a rectangular shape, are formed so as to correspond to the plurality of solid light emitting elements 12 of the light emitting element array 11, respectively. The lens array 16 includes a plurality of single-convex lenses corresponding to the plurality of openings 15 of the optical mask 13 on the surface (outgoing surface) opposite to the surface facing the optical mask 13, respectively. Reference numeral 17 is a transparent member formed in a row and column direction.

  On the other hand, the configuration of the surface light source 20 for background display is not shown, but it is made of, for example, a plate-shaped transparent member, and an incident surface through which light is incident is formed on one end surface thereof, and the surface of one of the two plate surfaces is A light guide plate in which an exit surface for light incident from the entrance surface is formed, and a reflective surface for reflecting light incident from the entrance surface toward the exit surface is formed on the other plate surface, and the entrance of the light guide plate It comprises a plurality of light emitting elements arranged facing the surface and a light diffusion layer provided on the exit surface of the light guide plate, and irradiates illumination light made of diffused light toward the background display unit 9 . The surface light source 20 for background display is disposed at a fixed position so as to face the background display unit 9 of the liquid crystal display element 6.

  Further, this display device is provided with a blindfold plate 23 that is disposed on both sides of the screen 1 in the left-right direction and covers the first and second image projecting means 3a, 3b with respect to the observation side 30.

  The display device displays an image on one or both of the first and second image projecting units 3 a and 3 b arranged behind the scattering / transmission control type screen 1 and projects the image onto the screen 1. By controlling the projection area of the image projected by the image projection means 3a, 3b of the screen 1 to the scattering state and controlling the other area to the transmission state by the screen driving means 22. The images projected by the projected image display units 8a and 8b are projected and displayed on the region 24 of the screen 1 controlled to the scattering state.

  That is, since the scattering / transmission control type screen 1 is composed of the matrix type light scattering liquid crystal element 2 formed by arranging a plurality of transmission / scattering control units in a matrix form, By controlling the voltage applied to the scattering control unit in correspondence with the image to be displayed on the image projection means 3a, 3b, an image projection region (image projection means) of the screen 1 by the image projection means 3a, 3b. 3a and 3b) can be controlled to the scattering state, and the other regions can be controlled to the transmission state.

  Since the region (hereinafter referred to as a scattering region) 24 controlled to be in the scattering state of the screen 1 is a cloudy translucent region, the display images of the projection image display units 3a and 3b are displayed on the screen 1 as described above. The image can be projected on the scattering region 24.

  On the other hand, the region controlled to the transmission state of the screen 1, that is, the region other than the scattering region 24 is substantially transparent, and is therefore projected onto the eyes of the observer by the projection image display units 3a and 3b. Then, the image projected on the scattering region 24 of the screen 1 appears to be floating in the air, and the image is observed in a pseudo three-dimensional manner.

  Further, since the display device has a background display means 4 for displaying the background of the image projected on the screen 1 by the image projection means 3a, 3b behind the screen 1, the background display means By displaying the background on the screen 4, the image projected on the screen 1 can be displayed with a sense of perspective so that the image displayed by the background display means 4 is closer to the observation side 30 than the background displayed. it can.

  5 to 7 show examples of display by the display device. Here, an example is shown in which an image is displayed on the first image projection means 3a of the two image projection means 3a and 3b. ing.

  As shown in FIG. 5, the image 25 is displayed on the first image projection unit 3a, the background 26 is displayed on the background display unit 4, and the first image of the screen 1 is displayed as shown in FIG. When the projection area of the image 25 by the projection means 3a is controlled to the scattering state, the background 26 displayed by the background display means 4 appears at the position of the display surface of the background display means 4 as shown in FIG. An image 25a projected by the image projecting means 3a and projected on the scattering region 24 of the screen 1 is observed at the position of the screen 1 as a pseudo three-dimensional foreground image that protrudes from the background to the observation side.

  In the above display example, the image 25 is displayed on the first image projecting means 3a. However, the image is displayed on the second image projecting means 3b, and the second image projecting means 3b in the screen 1 is displayed. The projection area of the image may be controlled to the scattering state, and in this case, the image projected by the second image projection unit 3b is observed as a pseudo-stereoscopic foreground image that protrudes from the background. Can do.

  In addition, images are displayed on both the first and second image projecting units 3a and 3b, respectively, and projection areas of the image by the first and second image projecting units 3a and 3b of the screen 1 are displayed. Each of the images may be controlled to be in the scattering state, and in this way, both the images projected by the first and second image projecting units 3a and 3b are converted into pseudo-stereoscopic foreground images that are raised from the background. Can be observed.

  In this display device, it is desirable that the portions other than the display image on the screens of the image projecting means 3a and 3b are displayed in black, so that only the display image can be projected onto the screen 1. .

  The image 25 displayed on the image projection means 3a, 3b is an image in which the ratio of the image 25 to the screen of the image projection means 3a, 3b is larger than the ratio of the background 26 to the screen of the background display means 4. In this way, the perspective of the background 26 displayed on the background display means 4 and the image 25a projected on the screen 1 can be further strengthened.

  Furthermore, the display device has a projection direction control function for projecting an image at an arbitrary position of the screen 1 in each of the first and second image projecting units 3a and 3b, and the screen 1 is driven by the screen. The means 22 corresponds to the control of the projection direction of the first and second image projection means 3a and 3b, respectively, and the projection areas of the images by the first and second image projection means 3a and 3b are respectively determined. Since it is configured so as to be controlled in the scattering state, the pseudo-stereoscopic moving image is projected from the background by projecting the display images of the image projecting units 3a and 3b onto the screen 1 while sequentially changing the position. Can be displayed.

  The display device includes a liquid crystal display element having projection image display units 8a and 8b for displaying an image projected on the screen 1 and a background display unit 9 for displaying a background behind the screen 1. 6 and on the opposite side of the liquid crystal display element 6 from the side facing the screen 1, the projection image display units 8a and 8b and the background display unit 9 are respectively opposed to the projection image display unit 8a, A liquid crystal display panel 5 having a plurality of surface light sources 10a, 10b, and 20 for irradiating illumination light toward the respective 8b and the background display unit 9 is disposed, and the projected image display units 8a and 8b of the liquid crystal display element 6 are arranged. The surface light sources 10a and 10b facing the projection image display portions 8a and 8b constitute an image projection means 3a, and the surface light facing the background display portion 9 and the background display portion 9 of the liquid crystal display element 6 20 because that constitute the background display unit 4, it is possible to manufacture at low cost with a small number of parts.

  The display device can rotate the surface light sources 10a and 10b of the image projection means 3a and 3b in a direction to change the illumination angle of the illumination light to the projection image display portions 8a and 8b of the liquid crystal display element 6. Therefore, the image projection means 3a, 3b can be provided with a projection direction control function for projecting an image at an arbitrary position on the screen 1.

  Further, the display device irradiates the illumination light, which is substantially parallel light, from the surface light sources 10a and 10b of the image projection means 3a and 3b toward the projection image display units 8a and 8b of the liquid crystal display element 6. Therefore, the image 25 displayed on the image projecting means 3a, 3b can be projected on the screen 1 as it is, and therefore displayed on the image projecting means 3a, 3b of the screen 1. Since the region having substantially the same shape as the outer shape of the image that has been made only needs to be controlled in a scattering state, the screen 1 can be easily driven.

  In addition, if the projection light from the image projection means 3a, 3b is the parallel light, the image projection means 3a, 3b to the screen 1 in accordance with the control of the projection direction as in the case of displaying the moving image. Even when the projection distance and the projection angle change, the display images of the image projection means 3a and 3b can be accurately projected on the scattering region 24 of the screen 1 without causing any positional deviation.

(Second embodiment)
FIG. 8 is a plan view of a display device showing a second embodiment of the present invention. In this embodiment, the same reference numerals are given to those corresponding to the first embodiment, and description of substantially the same components will be omitted.

  The display device of this embodiment includes a scattering / transmission control type screen 1 composed of a light scattering type liquid crystal element 2, and first and second projection image display panels 32a and 32b for displaying an image projected on the screen 1. A first and second image projecting means 31a, 31b, and a background display means 37 comprising a background display panel 38 for displaying the background of the image projected on the screen 1 by the image projecting means 31a, 31b. It has.

  The first and second projection image display panels 32a and 32b and the background display panel 38 are liquid crystal display panels, respectively. The projection image display panels 32a and 32b are respectively transmissive liquid crystal display elements 33a and 33b, and The liquid crystal display elements 33a and 33b are arranged on the side opposite to the side facing the screen 1, and are composed of surface light sources 34a and 34b for irradiating the liquid crystal display elements 33a and 33b with illumination light composed of parallel light. . That is, the projection image display panels 32a and 32b respectively irradiate the screen 1 with light that is substantially parallel light.

  The background display panel 38 is disposed on the opposite side of the transmissive liquid crystal display element 39 and the side of the liquid crystal display element 39 that faces the screen 1, and is made of diffused light toward the liquid crystal display element 39. It consists of a surface light source 40 that emits light.

  The background display panel 38 is disposed behind the screen 1, and the first and second projection image display panels 32a and 32b are respectively provided on one side and the other side of the background display means 37 in the left-right direction. Has been placed.

  Further, the first and second projection image display panels 32a and 32b are respectively fixed on turntables 36a and 36b that rotate about rotation axes 35a and 35b parallel to the vertical direction of the screen 1, and the screens. The display panels 32a and 32b are provided so as to be rotatable in the direction of changing the angle of the display surfaces of the display panels 32a and 32b with respect to one surface.

  Since this display device is configured as described above, it is possible to perform display similar to that of the display device of the first embodiment described above.

(Other examples)
The display devices of the first and second embodiments include the first and second image projecting units, but the image projecting unit may be one, or two or more. The image projection means and the background display means are not limited to a liquid crystal display panel including a transmissive liquid crystal display element and a surface light source, and may be a self-luminous display panel such as an organic EL (electroluminescence) display panel.

  Further, in the display device of the above embodiment, the image displayed on the image projecting unit is directly projected onto the screen 1, but the image displayed on the image projecting unit is refracted by a prism or the like to be refracted by the screen. The image displayed on the image projection means may be projected onto the screen 1 by a projection lens.

  In the display device of the above embodiment, background display means for displaying the background of the image projected on the screen by the image projection means is arranged behind the screen 1, but the background display means is omitted. May be.

1 is a perspective view of a display device showing a first embodiment of the present invention. The top view of the display apparatus of a 1st Example. The disassembled perspective view of a part of the surface light source for projection image display of the liquid crystal display panel in the first embodiment. Sectional drawing which abbreviate | omitted the hatching of a part of the said projection image display surface light source. The figure which shows the example of a display of the image projection means in the display apparatus of a 1st Example, and a background display means. The figure which shows the transmission / scattering control example of the scattering / transmission control type screen in the display apparatus of a 1st Example. The figure which shows the example of an image observed in the display apparatus of a 1st Example. The top view of the display apparatus which shows 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Scattering / transmission control type screen, 2 ... Light scattering type liquid crystal element, 24 ... Scattering region, 3a, 3b, 31a, 31b ... Image projection means, 4, 37 ... Background display means, 5, 32a, 32b ... Liquid crystal display Panel, 6, 33a, 33b ... Liquid crystal display element, 8a, 8b ... Projection image display unit, 9 ... Background display unit, 10a, 10b, 20, 34a, 34b ... Surface light source, 21 ... Display drive means, 22 ... Screen drive Means, 25: Display image of the image projection means, 25a: Screen projection image, 26: Background, 30 ... Observation side.

Claims (11)

A scattering / transmission control type screen comprising a light scattering type liquid crystal element and controlled by a voltage application to a scattering state in which incident light is scattered and a transmission state in which the incident light is transmitted;
Image projecting means for displaying an image and projecting the image onto the screen;
Screen driving means for controlling a projection area of the image by the image projection means in the screen to the scattering state and controlling other areas to the transmission state;
A display device comprising:   The image projection means has a projection direction control function for projecting an image onto an arbitrary position of the screen, and the screen drive means drives the screen in response to the control of the projection direction of the image projection means. The display device according to claim 1.   A plurality of image projecting units for projecting images to different positions on the screen, respectively, and the screen driving unit controls the projection areas of the images by the plurality of image projecting units to a scattering state, respectively. The display device according to 1.   The background display means for displaying the background of the image projected on the screen by the image projection means as viewed from the observation side is arranged behind the screen. Display device.   The display device according to claim 1, wherein the image projecting unit and the background display unit include a single display panel that displays an image projected on a screen and a background.   The display panel includes a liquid crystal display element having a projected image display unit for displaying an image projected on a screen and a background display unit for displaying a background, and is opposite to a side of the liquid crystal display element facing the screen. A liquid crystal display including a plurality of surface light sources disposed on the side facing the projection image display unit and the background display unit and irradiating illumination light toward the projection image display unit and the background display unit, respectively. The image projection means includes a projection image display section of the liquid crystal display element and the surface light source facing the projection image display section, and a background display means includes the background display section of the liquid crystal display element and the The display device according to claim 5, comprising the surface light source facing the background display unit.   The display device according to claim 6, wherein the surface light source of the image projecting unit is provided so as to be rotatable in a direction in which an irradiation angle of illumination light to the projection image display unit of the liquid crystal display element is changed.   The display device according to claim 7, wherein the surface light source of the image projecting unit irradiates illumination light composed of substantially parallel light toward the projected image display unit of the liquid crystal display element.   2. The image projection means comprises a projection image display panel for displaying an image to be projected on a screen, and the background display means comprises a background display panel for displaying the background. The display device described.   The display device according to claim 9, wherein the projection image display panel is provided so as to be rotatable in a direction in which an angle of the display surface of the display panel with respect to a screen surface is changed.   The display device according to claim 10, wherein the projection image display panel irradiates light that is substantially parallel light toward the screen.

Images