JP2006084570A - Display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a clear picture even when light is made incident diagonally upon a screen. <P>SOLUTION: The display apparatus has: a light source means which irradiates the screen with projection light such as color sequential light; a plurality of dividing members partially composing the screen, having respective partial island faces corresponding to respective pixels of an image to be displayed on the screen and are arranged along the screen so that the angles of the partial faces are variable with respect to the screen; and driving means which respectively drive the plurality of dividing members on the basis of image data so that the angles of the partial faces vary so that the picture is displayed on the screen with reflected light composed of the light which the partial faces reflect the projection light. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technical field of a display device that displays an image on a screen surface, for example.

  In a projection apparatus such as a liquid crystal projector as a typical example of this type of display apparatus, for example, light modulated in accordance with an image signal by the liquid crystal light valve is projected onto a screen surface via the projection optical system. The Here, projecting a projected image from a position perpendicular to the screen surface is excellent from the viewpoint of preventing distortion from occurring in the projected image projected on the screen surface. However, the projection apparatus is usually placed on a desktop or a dedicated stand that is lower than the screen surface, or is suspended from a ceiling that is higher than the screen surface. Furthermore, due to the layout of desks and chairs in conference halls, the position facing the screen surface in the left-right direction is often for the person viewing the projection image, and the projection device is shifted to either the left or right. Are often arranged. For this reason, the projected image is actually projected on the screen surface in an obliquely large or small vertical direction or horizontal direction.

  For this reason, conventionally, even when a projected image is projected obliquely, an apparatus is known that performs correction so that the projected image is not distorted, for example, a projected image having a rectangular edge as a whole is distorted into a trapezoid. For example, see Patent Document 1).

JP 2001-339671 A

  In this type of projection apparatus, it is effective to increase the distance from the projection apparatus to the screen surface in order to project large images in a narrow room. For this purpose, the projection image is positively projected on the screen surface. It is also possible to project it diagonally. And if the technique of patent document 1 is used, when projecting light is projected from the diagonal, since it is possible to correct | amend the distortion of an image, it is thought that it is convenient.

  However, as long as the projected image is projected onto the screen surface at a considerable distance from the projection device in the air, the projection light deteriorates up to the screen surface, and further, the light scatters on the screen surface. It is fundamentally difficult to improve the freshness of an image, and it is even more difficult when projection light is projected from an oblique direction. This problem is also caused by the technique disclosed in Patent Document 1. Displaying an image with a high sense of presence or high freshness on the screen surface modulates light on the projection apparatus side as in Patent Document 1 or the like. As far as it is still difficult. In particular, there is a technical problem that as the direction of the projection light is tilted with respect to the screen surface, it becomes difficult to display a clear image on the screen surface.

  In addition, there is a strong general demand for miniaturization and thinning of the projection apparatus itself, and it becomes difficult to modulate projection light, which is very powerful for a huge screen surface, with high definition by a small liquid crystal light valve. It is coming.

  The present invention has been made in view of the above problems, for example, and can display a clear image on the screen surface, and can display a clear image even when the projection light is applied from an oblique direction. It is an object to provide a display device.

  In order to solve the above problems, the display device of the present invention partially constitutes a light source means for irradiating projection light, a screen surface to which the projection light is irradiated, and each display image to be displayed on the screen. Each of the partial surfaces has an island-shaped partial surface corresponding to a pixel, and is arranged such that the angle of the partial surface is variable with respect to the screen surface. Drive that drives each of the plurality of divided members based on the image data so that the angle of the partial surface changes so that the display image is displayed on the screen surface by reflected light formed by reflecting projection light Means.

  According to the display device of the present invention, at the time of display, the light source means irradiates the screen surface with, for example, RGB color sequential light while sequentially switching the colors of a predetermined plurality of colors at a predetermined cycle. Alternatively, monochromatic light such as white light is applied to the screen surface. Then, for example, a plurality of divided members are driven based on the image data by a driving means including an actuator, a piezoelectric element, a motor, etc., and the angle of the island-shaped partial surface corresponding to each pixel of the display image changes. To do. For example, on the partial surface that should display white as part of the display image, the angle is changed so that the reflected light is reflected in the observation direction, and the reflected light reflects in the observation direction on the partial surface that should display black. The angle is changed and set so that it is not. Here, the “observation direction” according to the present invention means a direction in which an observer who observes a display image is present with respect to the screen surface. The observer may be an actual or ideal observer, for example, in front of or near the front of the screen surface, or in an oblique direction with respect to the screen surface depending on the application or the installation status of the display device. In any case, the observation direction means the direction in which the observer is in this way with respect to the screen surface. Furthermore, the angle is changed and set so that the reflected light is reflected in the observation direction at a frequency corresponding to the degree of whiteness in gray on the partial surface where gray is to be displayed. In this case, halftone gradation display is possible by using the afterimage phenomenon in the visual perception of the observer by time-division display of white and black, that is, by adjusting the time ratio between white display and black display. Is done. Alternatively, the angle is changed and set so that the reflected light in a proportion corresponding to the whiteness degree in gray is reflected in the observation direction on the partial surface where gray is to be displayed. In this case, halftone display is possible by changing the amount of light in the reflected light continuously or stepwise according to the angle of the partial surface. Even in the case of color display, for example, RGB color sequential light is reflected on each partial surface in a time division manner, that is, the time ratio of R (red) display, G (green) display, and B (blue) display. By making use of this adjustment, it is possible to display color gradations by utilizing the afterimage phenomenon in the visual perception of the observer.

  Each of the partial surfaces that perform such reflection is formed of, for example, a moderately roughened mirror surface having reflectivity and some light scattering properties so as to appropriately secure a viewing angle on the entire screen surface. However, depending on the application, it may be a complete mirror surface. Further, the size of each partial surface may be fine enough to be invisible to the eyes of the person when the person views the entire area of the screen surface from a normal distance, for example. At this time, the size of the partial surface is preferably set to a pixel size assumed in relation to the resolution of the image data. In other words, it is preferable to supply image data corresponding to the size or density of the partial surface. Alternatively, even if the partial surface is fine enough to be recognized by human eyes, there is no particular problem depending on the required image quality and application. On the contrary, it is also possible to give designability by enlarging the size of each partial surface to a conspicuous extent. In addition, since the light reflected on each partial surface is usually a little scattered light, the “reflection direction” according to the present invention is the light having the highest density or the highest intensity in the light amount distribution or the light intensity distribution. Means the direction of reflection.

  In this way, the angle of the partial surface is changed as the dividing member is driven, so that the display image is displayed on the screen surface by the reflected light that the partial surface reflects the projection light. For example, various display images such as a color image, a black and white image, a moving image, a still image, and a moving image that moves more slowly than a normal moving image are displayed. In particular, even if the projection light is irradiated obliquely with respect to the screen surface, the reflected light can be reflected, for example, in an observation direction located in front of the screen surface by adjusting the angle of the partial surface. As a result, a clear image can be displayed on the screen surface.

  The “screen surface” according to the present invention is a single plane or a gentle curved surface as a whole or macroscopically. However, each of the partial surfaces constituting this or a microscopic surface has irregularities. It is a spreading surface. In other words, an uneven surface formed by arranging a plurality of partial surfaces is a screen surface. “Irradiating with respect to the screen surface” means that the projection surface is irradiated with an oblique angle, that is, the incident angle is smaller than 90 degrees with respect to the screen surface having such irregularities. Yes.

  As a result, according to the display device of the present invention, since the projection light is directly modulated on the screen surface, a clear image can be displayed on the screen surface. In particular, a clear image can be displayed even when the projection light is applied obliquely. Thereby, even when displaying in a narrow room, the distance from the light source means to the screen surface can be obtained, which is very advantageous in practice.

  In addition, the angles of the individual partial surfaces may be changed and set in consideration of the distance from the light source means to the individual partial surfaces so that the brightness of the entire screen surface is uniform within the surface. More specifically, on the partial surface far from the light source means (that is, the partial surface where relatively weak light reaches the projection light), the amount of light reflected in the observation direction is relatively large or maximum. The angle of the light is reflected so that the amount of light reflected in the observation direction is relative to the partial surface closer to the light source means (that is, the partial surface where relatively strong light reaches the projection light). The angle may be set to be smaller.

  In one aspect of the display device according to the present invention, the light source means is disposed at a position that projects the projection light obliquely with respect to the screen surface, and the driving means is configured such that the reflected light is the screen surface. On the other hand, the plurality of divided members are driven so as to be directed in the direction closer to the front side than the light source means.

  According to this aspect, the light source means is disposed obliquely with respect to the screen surface. Therefore, the distance from the light source means to the screen surface can be earned even when displaying in a narrow room. In addition, the plurality of dividing members are driven by the driving means so that the reflected light is directed toward the front side of the light source means with respect to the screen surface according to the oblique arrangement of the light source means. Therefore, even if the light source is arranged obliquely, the projection light can be modulated directly on the screen surface, and a clear image can be displayed.

  In another aspect of the display device according to the present invention, the drive means has a first angle for reflecting the reflected light on the plurality of partial surfaces in the observation direction of the screen surface and the reflected light in the observation direction. After determining a second angle for preventing reflection, the plurality of divided members are driven so that the angle of the partial surface becomes the first or second angle.

  According to this aspect, first, the first and second angles can be appropriately determined according to the individual specific arrangement of the light source means and the observer. At the time of display, since the plurality of divided members are driven by the driving means so that the angle of the partial surface becomes the determined first or second angle, the light source means is arranged at a desired position. On the other hand, a clear display image can be displayed on the screen surface for an observer at a desired position.

  In this aspect, the driving means may determine the first and second angles with an incident angle incident on the screen surface from the light source means as one parameter.

  If comprised in this way, it will be arrange | positioned with respect to the screen surface left-right or up-down diagonally, for example, and the incident angle of the projection light from the light source means arrange | positioned at the front is made into one parameter, and the 1st and 1st about a partial surface Two angles are determined. Such first and second angles may be common to all partial surfaces, or may be individually determined for each partial surface according to the position of each partial surface in the screen surface. Therefore, even when the light source means is arranged at a desired position such as the ceiling or floor, or at the right end or the left end, the angle of each partial surface is set to the first and second angles based on the image data at the time of display. Since the setting can be changed, a clear display image can be displayed on the screen.

  In the aspect related to the one parameter, the driving means may determine the first and second angles using the angle of the observation direction with respect to the screen surface as another parameter in addition to the one parameter. Good.

  If comprised in this way, the angle of the observation direction which is an angle of the direction where the observer who exists in the front with respect to a screen surface, for example, is on the left and right side, and other parameters is used as the first and A second angle is determined. Such first and second angles may be common to all partial surfaces, or may be individually determined for each partial surface according to the position of each partial surface in the screen surface. Therefore, for example, not only in front of the screen surface but also in various environments in which an observer is at a desired position such as the right end or the left end, the angle of each partial surface is set based on the image data at the time of display. Since the second angle can be changed and set, a clear display image can be displayed on the screen surface.

  In the aspect related to the one parameter, an angle detecting unit for detecting the incident angle may be further provided, and the first and second angles may be determined using the detected incident angle as the one parameter.

  According to this aspect, for example, the incident angle is detected as an angle of the light source unit with respect to the screen surface by an angle detection unit such as an azimuth sensor or a computer. Alternatively, the incident angle of the projection light can be detected more directly by the light receiving sensor provided near the screen surface. Therefore, the first and second angles can be automatically determined based on the detected incident angle.

  In another aspect of the display device according to the present invention, the light source unit emits light of a predetermined plurality of colors as the projection light while sequentially switching colors at a predetermined period, and the driving unit is configured to each of the plurality of partial surfaces. The plurality of divided members are driven at a period corresponding to the predetermined period so that the colors of the corresponding pixels constituting the display image are visually recognized by time division.

  According to this aspect, at the time of display, the light source means irradiates light of a predetermined plurality of colors while sequentially switching colors at a predetermined period. That is, color sequential light is irradiated. The driving means drives each of the plurality of divided members at a period corresponding to the predetermined period related to the color sequential light, and the color of each partial surface is visually recognized by the afterimage phenomenon of the observer by time division. The

  In another aspect of the display device according to the present invention, the driving means includes a plurality of piezoelectric elements for each of the plurality of divided members, and each of the plurality of piezoelectric elements expands and contracts in a normal direction of the partial surface. It is arranged so that the stretching force acts at a plurality of points different from each other with respect to the partial surface, and the angle of the partial surface changes due to the difference in expansion and contraction between the plurality of piezoelectric elements. In this way, the plurality of divided members are driven.

  According to this aspect, when driving the divided member, the plurality of piezoelectric elements attached to the divided member expand and contract, and the angle of the partial surface changes due to the difference in expansion and contraction between them. Therefore, by varying the voltage signal applied to the piezoelectric element according to the image data, it is possible to tilt the partial surface at a desired cycle, a desired angle, and a desired orientation.

  The plurality of piezoelectric elements are preferably three columnar piezoelectric elements having one ends arranged at positions that form a triangle in a plane parallel to the partial surface. If comprised in this way, it will become possible to incline a partial surface to a desired direction rapidly. Alternatively, in this case, one of the three piezoelectric elements is replaced with a columnar member that does not expand and contract, and a plurality of divided members are arranged so that the angle of the partial surface changes depending on the expansion and contraction of the two piezoelectric elements and the columnar member. It is also possible to drive each. However, the use of two piezoelectric elements facilitates and widens the angle range that can be changed as the angle of the partial surface.

  In the aspect provided with this piezoelectric element, the driving means is wired behind each other behind the screen surface, and image signals corresponding to a plurality of row selection lines and image data to which row selection signals are respectively supplied. A plurality of data lines may be provided, and the plurality of piezoelectric elements may be driven in a matrix according to the row selection signal and the image signal.

  If comprised in this way, it will become possible to drive each division | segmentation member using a relatively small number of row selection lines and data lines by performing matrix drive.

  In the aspect provided with this piezoelectric element, the plurality of piezoelectric elements may be composed of three columnar piezoelectric elements, each of which is attached to a position where each tip is not on the same straight line for each of the plurality of divided members. It may be configured.

  According to this configuration, the geometrical shape is obtained by three columnar piezoelectric elements attached to the positions where the tips are not on the same straight line, that is, the positions defining the vertices of the triangle on one plane. From the point of view, the single plane can always be uniquely defined. That is, even if one, two, or three of these three piezoelectric elements are expanded or contracted to any degree, one plane is uniquely determined. For this reason, in any driving state, the angle of the partial surface can be stably changed to a desired angle. For example, when four piezoelectric elements are provided, there is a possibility that one piezoelectric element floats or tends to float, as in the case of a four-legged desk or chair in which the length of the leg is shifted, It may be difficult to change and set the angle of the partial surface to a desired angle, or due to four piezoelectric elements that are not on the same plane, distortion may occur in the divided members attached to these tips. From this point of view, it is practically advantageous to provide three piezoelectric elements as in this embodiment.

  However, for various purposes such as increasing driving force, four or more columnar piezoelectric elements may be provided for each of the plurality of divided members, or one or two columnar piezoelectric elements may be provided as described above. May be.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

(First embodiment of display device)
A first embodiment of a display device according to the present invention will be described with reference to FIGS.

  First, with reference to FIG. 1, the positional relationship between the screen panel device in the display device of the first embodiment and the light source device that irradiates projection light on the screen panel device will be mainly described. FIG. 1 is a schematic plan view showing a main configuration of the display device according to the first embodiment together with an observer.

  As shown in FIG. 1, the display device of this embodiment includes a panel device 101 having a screen surface 10, a row selection line driving circuit 111 and a data line driving circuit 112 for driving the panel device 101, and a row selection line. A control signal output device 134 that outputs control signals Sc and Sd to the drive circuit 111 and the data line drive circuit 112, a light source device 201 that irradiates the projection light 301in to the screen surface 10, and a projection light 301in in the light source device 212. And a projection light control device 212 for controlling the emission operation.

  The panel device 101 is arranged so that the projection light 301in is projected obliquely to the screen surface 10 by the light source device 201. The observer 501 is at a position facing the screen surface 10.

  When the panel device 101 performs white display on the entire area of the screen surface 10, the projection light 301 in emitted from the light source device 201 is set to a projection angle θp (θp <90 degrees) set in advance with respect to the screen surface 10. Thus, the display light 301out that is incident obliquely and reflected by the screen surface 10 is configured to be directed mainly toward the viewer 501. Since the display light 301out is actually scattered light or diffused light that is somewhat scattered, the direction of the display light 301out indicated by the arrow in the figure is the highest density or highest in the light quantity distribution or light intensity distribution. It means the direction in which intense light travels.

  Next, a specific configuration example of the light source device 201 will be described with reference to FIGS. 2 and 3. FIG. 2 is a front view (FIG. 2A) of a disc-shaped color filter in a specific example of the light source device according to the first embodiment, and a block diagram of a specific example of the light source device including the same (FIG. b)). FIG. 3 is a block diagram illustrating another specific example of the light source device according to the first embodiment.

  As shown in FIG. 2, a light source device 201a, which is a specific example of the light source device 201 shown in FIG. 1, includes a disc-shaped color filter 210 having a red filter 210R, a green filter 210G, and a blue filter 210B (FIG. 2A). ), A motor 211 that rotates the disk-shaped color filter 210, a white lamp unit 202 that generates white light such as a metal halide lamp, and a projection lens 203. Then, the projection light control device 212 controls the motor 211 to rotate the disk-shaped color filter 210 at a predetermined frequency, so that the motor 211 is made from the white light emitted from the white lamp unit 202 and projected by the projection lens 203. The color sequential light 301in in which RGB is sequentially switched every time the lens rotates approximately 120 degrees is generated and output.

  The projection light control device 212 is a color indicating which color of the color sequential light 301 in is R (red), G (green), and B (blue) at each time in synchronization with the rotation of the motor 210. The sequence signal Sr is output. As shown in FIG. 1, the color sequence signal Sr is supplied to the control signal output device 134 and is used as a basis for generating the control signals Sc and Sd.

  As shown in FIG. 3, a light source device 201b, which is another specific example of the light source device 201 shown in FIG. 1, includes a white lamp unit 1102 that generates white light such as a metal halide lamp, and RGB sequential light from the white light. And an optical system 1100 for generation. The optical system 1100 includes a half mirror 1108 that separates white light from the white lamp unit 1102 into RGB light, a mirror 1106 and relay lenses 1122 to 1124 that guide the separated RGB light, and RGB. Shutter devices 100R, 100G, and 100B, a dichroic prism 1112 for recombining light of each color of RGB into the same optical path, and a projection lens 1114.

  In the optical system 1100, when white light is emitted from the white lamp unit 1102, the light components R, G, and B corresponding to the three primary colors of RGB are separated by the three mirrors 1106 and the two dichroic mirrors 1108. Are respectively guided to the shutter devices 100R, 100G, and 100B. The shutter devices 100R, 100G, and 100B include, for example, a liquid crystal shutter device, a mechanical shutter device, a piezoelectric shutter device, and the like. At this time, in particular, the B light is guided through a relay lens system 1121 including an incident lens 1122, a relay lens 1123, and an exit lens 1124 in order to prevent light loss due to a long optical path. Then, the RGB light sequentially transmitted by the shutter devices 100R, 100G, and 100B is further combined again by the dichroic prism 1112 sequentially, and is emitted as the color sequential light 301in through the projection lens 1114. It is comprised so that.

  In the specific example shown in FIG. 3, the projection light control device 212 (see FIG. 1) performs control so that the transmission operation (shielding operation) is sequentially performed in each of the shutter devices 100R, 100G, and 100B. Further, in synchronization with this transmission operation, a color sequence signal Sr indicating which color of RGB is used as the color sequential light 301in is output at each time. As shown in FIG. 1, the color sequence signal Sr is supplied to the control signal output device 134 and is used as a basis for generating the control signals Sc and Sd.

  Next, with reference to FIGS. 4 to 7, a configuration related to driving of the panel device in the display device of the present embodiment will be described in detail. FIG. 4 is a schematic block diagram relating to the overall configuration of the display device of the present embodiment, and includes a state in which the panel device is viewed from the front. 5 is a partially enlarged perspective view showing the configuration of the dividing member in the display device of FIG. 4, FIG. 6 is a partially enlarged exploded perspective view showing the configuration of the dividing member in the display device of FIG. 4, and FIG. FIG. 5 is an electrical block diagram showing a circuit configuration of a panel device and a drive circuit in the display device of FIG. 4.

  As shown in FIG. 4, in the display device of this embodiment, a row selection line driving circuit 111 is provided on the left side of the panel device 101 toward the screen surface 10, and the upper side of the screen surface 10 in the panel device 101. A data line driving circuit 112 is provided. The row selection line driving circuit 111 is a piezoelectric element that drives each divided member 116 in the panel device 101 as shown in FIGS. 5 and 6 via a plurality of row selection lines 121 extending in the horizontal direction with respect to the screen surface 10. A row selection signal is supplied to the memory 167 holding the voltage of 166. Then, the data line driving circuit 112 supplies two power supply potential signals VSS and VDD for driving the piezoelectric element 166 via the plurality of wirings 122a and 122b extending in the vertical direction with respect to the screen surface 10, respectively. 166. The data line driving circuit 112 is further configured to supply a BIT (bit) signal, which is an example of an image signal corresponding to image data, for driving the piezoelectric element 166 to the memory 167 via the data line 122a. Has been.

  As shown in FIG. 5 which is an enlarged perspective view of the region C4 of the panel device 101 shown in FIG. 4 as viewed from the front and FIG. 6 which is an enlarged exploded perspective view as viewed from the rear, as shown in FIG. Are arranged in a matrix along the screen surface 10 and have a plurality of divided members 116 each having a partial surface 126 made of island-shaped rectangular surfaces, and a plurality of divided members so that the angle of each partial surface 116 can be changed. And an element substrate 136 to which a piezoelectric element 166 for driving the member 116 is attached. Each of the partial surfaces 126 includes a white scattering surface or a roughened mirror surface facing the screen surface 10 side of the dividing member 116. Examples of the material include resin, metal, chemical fiber, and glass.

  As shown in FIG. 6, three columnar piezoelectric elements 166 constituting one example of the “driving means” according to the present invention are provided on the back side of the partial surface 126 for each divided member 116. The piezoelectric element 166 expands and contracts according to the voltage applied thereto, and changes its columnar length. For example, only one or two of the three piezoelectric elements 166 are expanded and contracted. Thereby, the angle of the partial surface 126 can be changed to a desired angle by inclining the dividing member 115. Such an angle of the partial surface 126 is the first for reflecting the display light 301out as reflected light of the projection light 301in on each partial surface 126 toward the observer 501 (see FIG. 1) who views the screen surface 10. The angle can be changed between one angle and the second angle for preventing the display light 301out as the reflected light from being reflected toward the viewer 501.

  For example, by increasing the period of the voltage signal applied to the piezoelectric element 166, 256 gradations × 3 colors × 60 Hz = 46080 necessary for color display of 256 gradations of each RGB color for an image having a frame period of 60 Hz. The angle of the partial surface 126 can be changed at a relatively high driving frequency such as times / second. Furthermore, if the three piezoelectric elements 166 are provided as close to each other as possible, the range of the amplitude or inclination of the partial surface 116 that can be covered with the same expansion / contraction difference between the three members can be increased.

  In FIG. 4 again, the display device further includes an angle sensor 142 and an operation panel 135. The angle sensor 142 includes an azimuth sensor, a camera, a calculator, and the like, and is configured to detect the projection angle θp (see FIG. 1) of the projection light 301in. The angle sensor 142 outputs information that directly indicates the projection angle or information that indicates the relative orientation of the light source device 201 with respect to the screen surface 10. At this time, as shown in FIG. 1, only one projection angle θp on the optical axis of the projection light 301 in may be detected for the entire screen surface 10, or the projection angles θp at a plurality of locations in the screen surface 10. May be detected.

  The control signal output device 134 obtains the first and second angles in advance based on the projection angle θp of the projection light 301in with respect to the screen surface 10, for example, according to the detection result of the angle sensor 142. That is, in the control signal output device 134, reflected light formed by reflecting the projection light 301in on each partial surface 126 is reflected as the display light 301out toward the observer 501 before or during actual display. Since the reflected light formed by reflecting the projection light 301in at each partial surface 126 does not reflect toward the observer 501, that is, the second angle at which the display light 301out does not reach the observer 501 is used as the light source. This is determined according to the arrangement relationship between the apparatus 201 and the observer 501. Here, the projection angle θp incident on the screen surface 10 from the light source device 201 is used as one parameter, and the angle of the viewer 501 with respect to the screen surface 10 is used as another parameter. Try to determine the angle. At this time, the relationship between the projection angle θp and the first or second angle is acquired in advance experimentally, empirically, simulation or theoretically, and the acquired relationship is tabulated to output a control signal. If it is stored in the memory in the device 134, the subsequent determination of the first and second angles can be performed quickly and reliably.

  As described above, the projection angle θp may be detected by the angle sensor 142 or may be input as projection angle data via the operation panel 135. In addition, the first and second angles may be common to all partial surfaces, or depending on the position of each partial surface 126 in the screen surface 10, that is, the degree of spread of the projection light 301in, In consideration of a subtle difference in the projection angle in each light portion, it may be determined individually for each partial surface 126.

  Therefore, for example, when the light source device 201 is arranged at a desired position such as the ceiling or floor, or at the right end or the left end, or where the observer 501 is located with respect to the screen surface 10, As described below, a clear color image can be displayed on the screen surface 10 by changing the angle of each partial surface 126 to the first and second angles based on the BIT signal corresponding to the image data. It becomes.

  The control signal output device 134 changes the angle of the partial surface 126 to any one of the first and second angles obtained according to the detection result of the angle sensor 142 according to the color to be displayed, and further displays the display. A control signal is generated and output so that the angle changed for a time corresponding to the color to be maintained is maintained.

  As shown in FIG. 7, the data line driving circuit 112 has a control signal output device 134 (FIG. 4) for each of the three piezoelectric elements 166 provided for each partial surface 126 (see FIGS. 5 and 6). In accordance with the control signal input from the reference), a BIT signal indicating the respective gradations of RGB corresponding to the image data is supplied to each memory 167 via the data line 122c. The row selection line driving circuit 111 is configured to supply row selection signals line-sequentially. Note that the row selection line 121, the power supply potential line 122a, the power supply potential line 122b, and the data line 122c are arranged on the element substrate 136 shown in FIGS. 5 and 6 and a memory 167 including elements such as a semiconductor memory and a storage capacitor. It is formed with.

  Next, with reference to FIG. 4 to FIG. 7, the operation of the display device according to the present embodiment will be further described along with its configuration.

  In FIG. 4, during display, the light source device 201 irradiates the screen surface 10 with RGB color sequential light. Then, the row selection signal is sequentially supplied from the row selection line driving circuit 111 for each row at a timing corresponding to the color sequence signal Sr. In parallel with this, the data line driving circuit 112 supplies the BIT signal via the data line 122c. As a result, the voltage corresponding to the BIT signal is written from the corresponding data line 122c and held in the memory 167 connected to the row selection line 121 to which the row selection signal is supplied. Then, the dividing member 116 is driven by the piezoelectric element 166 according to the held voltage of the BIT signal, and the angle of the partial surface 126 corresponding to each pixel is changed between the first and second angles. Each piezoelectric element 166 uses the power supply voltage potentials VDD and VSS to perform the expansion operation appropriately during the period until the next BIT signal is newly written in accordance with the potential written in the corresponding memory 167. Will do.

  Therefore, the display image is displayed on the screen surface 10 depending on the presence or absence of the display light 301out for each pixel, which is the reflected light formed by the partial surface 126 reflecting the projection light 301in. At this time, various display images such as a moving image, a still image, and a moving image that moves more slowly than a normal moving image are displayed according to the type of the BIT signal.

  In this embodiment, in particular, during such driving, each partial surface 126 reflects the projection light 301in, which is color sequential light, in a time-sharing manner, that is, the time within a fixed time of R display, G display, and B display. By adjusting the ratio, it is possible to display a color gradation as a halftone display between RGB using the afterimage phenomenon in the visual sense of the observer 501.

  For example, as one field period for R, the row selection line 121 for selecting a pixel row is selected by setting the row selection signal to a high level during the period when the R light of the color sequential light is irradiated. Each time, the BIT signal for the column containing each pixel is supplied to the corresponding memory 167. At this time, the voltage value of the BIT signal indicates how long the R component should be displayed on each pixel corresponding to each partial surface 126, that is, how much color display including the R component is at the pixel. It is determined by the control signal output means 134 depending on whether it is performed. Then, in response to the color sequence signal Sr indicating that the color sequential light 301in is R light, the BIT signal is supplied to all the data lines 122c simultaneously or sequentially for each pixel row, and in addition to this for the entire pixel row. The BIT signal is supplied to the entire screen surface 10 by line-sequencing the row selection signal. As a result, for the one pixel, the pixel row to which the pixel belongs is selected by the row selection line 121 and a new BIT signal is supplied from the data line driving circuit 112 until the one pixel is selected. In the pixel, the R light continues to be reflected at the first angle for the time corresponding to the voltage value of the supplied BIT signal.

  Subsequently, similarly, during the period when the G light of the color sequential light is irradiated, the BIT signal for the column including each pixel is selected while the row selection line 121 for selecting the pixel row is selected. The corresponding memory 167 is supplied. At this time, the voltage value of the BIT signal is determined by the control signal output means 134 according to how long the G component should be displayed on each pixel corresponding to each partial surface 126. Then, in response to the color sequence signal Sr indicating that the color sequential light 301in is G light, the BIT signal is supplied to all the data lines 122c at the same time or sequentially for each pixel row, and further for the entire pixel row. The BIT signal is supplied over the entire screen surface by line-sequencing the row selection signal. Thus, until the next BIT signal is supplied to one pixel, the one pixel is set to the first angle only for a time corresponding to the voltage value of the supplied BIT signal. Thus, the G light continues to be reflected.

  Subsequently, similarly, during the period when the B light of the color sequential light is irradiated, while the row selection line 121 for selecting the pixel row is selected, the BIT signal for the column including each pixel is The corresponding memory 167 is supplied. At this time, the voltage value of the BIT signal is determined by the control signal output means 134 according to how long the B component should be displayed on each pixel corresponding to each partial surface 126. Then, in response to the color sequence signal Sr indicating that the color sequential light 301in is B light, the BIT signal is supplied to all the data lines 122c at the same time or sequentially for each pixel row, and further for the entire pixel row. The BIT signal is supplied over the entire screen surface by line-sequencing the row selection signal. Thus, until the next BIT signal is supplied to one pixel, the one pixel is set to the first angle only for a time corresponding to the voltage value of the supplied BIT signal. Thus, the B light continues to be reflected.

  For example, when the BIT signal of the highest gradation is written, the piezoelectric element 166 fixes the connected partial surface 126 at the first angle until the next BIT signal is written. On the other hand, for example, when the BIT signal of the lowest gradation is written, the piezoelectric element 166 fixes the connected partial surface 126 at the second angle until the next BIT signal is written. Further, for example, when an intermediate-level BIT signal is written, the piezoelectric element 166 causes the connected partial surface 126 to be at the first angle and is a part of the entire period until the next BIT signal is written. The time corresponding to the key is fixed, then changed to the second angle, and then fixed until the BIT signal is written. Or, for example, when an intermediate gradation BIT signal is written, the piezoelectric element 166 makes the connected partial surface 126 a second angle, and is a part of the entire period until the next BIT signal is written. The time corresponding to the key is fixed, then changed to the first angle, and then fixed until the BIT signal is written.

  In this way, the projection light 301in, which is color sequential light, is reflected on each partial surface 126 according to the BIT signal separately from the R light, G light, and B light, so that each partial surface 126, that is, each pixel. Thus, color display can be performed in a time-sharing manner, and thus color display can be performed on the entire screen surface.

  Moreover, according to the present embodiment, even if the projection light 301in is irradiated obliquely with respect to the screen surface 10, if the first and second angles of the partial surface 126 are adjusted, the observer 501 who is at a desired position Thus, the display light 301out can be directed as reflected light, so that a clear image can be displayed by the observer 50 on the screen surface 10.

  In addition, according to the present embodiment, a relatively large number of divided members 116 are driven by the piezoelectric elements 166 using a relatively small number of row selection lines 121 and data lines 122 by performing matrix driving. it can. However, it is of course possible to individually drive the piezoelectric elements 166 related to the individual divided members 116 with individual wires by the segment method. In particular, in the space behind the screen surface 10, there are almost no inconveniences in displaying an image even if a large number of various wirings and various elements are arranged.

  In the above-described embodiment, instead of binary control of the angle of the partial surface 126 by the piezoelectric element 166, multi-value control or continuous control of the angle of the partial surface 126 may be performed. For example, when a halftone BIT signal is written in the memory 167, the corresponding piezoelectric element 166 causes the partial surface 126 to move to an angle corresponding to the halftone between the first and second angles, and then to the BIT. You may comprise so that it may fix until a signal is written.

  Further, when no voltage is applied to the piezoelectric element 166, the partial surface 126 is tilted with respect to the screen surface 10 in advance at an angle corresponding to the standard position or standard projection angle of the light source device 201. You may comprise. In particular, if a standard use environment in which the projected image 301in is irradiated from the right or left side and the display image is shown to the viewer 501 positioned in front of the screen surface 10 is determined in advance, Setting the default value for the angle of the partial surface 126 when no voltage is applied to the piezoelectric element 166 leads to narrowing the amplitude range required for the piezoelectric element 166. Therefore, it is practically advantageous to simplify the device configuration and control.

  Furthermore, in the above-described embodiment, three piezoelectric elements are provided for each divided member 116, but two or one piezoelectric element may be provided. For example, each of the divided members is movably fixed around the support shaft, and one piezoelectric element is provided for each divided member, and the one piezoelectric element is configured to be able to expand and contract in the normal direction of the partial surface. In addition, the split member is arranged so that the expansion and contraction force acts on the support shaft, and the split member is driven so that the partial surface moves around the support shaft by the expansion and contraction of one piezoelectric element. It is also possible to configure. If comprised in this way, it will become possible to incline a partial surface in one azimuth | direction determined with the spindle with the desired period and the desired angle by fluctuating the BIT signal applied to a piezoelectric element. As long as there is one piezoelectric element for each divided member, drive control of the divided members is relatively easy.

  As a result, according to the display device of the present embodiment, the projection light 301in is directly modulated on the screen surface 10, so that a clear image can be displayed on the screen surface 10. In particular, since a clear image can be displayed even when the projection light 301in is applied obliquely, the distance from the light source device 201 to the screen surface 10 can be earned even when displaying in a narrow room. It is very advantageous.

(Second Embodiment of Display Device)
A second embodiment of the display device according to the present invention will be described with reference to FIGS. FIG. 8 is a schematic side view showing the display device of the second embodiment together with the observer, and FIG. 9 is a partially enlarged exploded perspective view showing a specific example of the dividing member in the second embodiment and its FIG. 8 and 9, the same reference numerals are given to the same components as those of the first embodiment shown in FIGS. 1 to 7, and the description thereof will be omitted as appropriate.

  As shown in FIG. 8, the display device of the present embodiment is configured such that a light source device 201 is attached to a ceiling 502 and emits projection light 301in obliquely downward.

  Further, as shown in FIG. 9A, which is an enlarged exploded perspective view of the region C2 of the panel device 102 in FIG. 8 as viewed obliquely from the rear, and FIG. 9B, which is a schematic sectional view thereof, the panel device 102. Includes a columnar portion 168 erected on the back surface side of the partial surface 126 for each divided member 116, a spherical portion 169 fixed to the tip of the columnar portion 168, and a plurality of roller portions 177 that rotate the spherical portion 169. And a drive circuit 146b for controlling the rotation of the roller unit 177. The roller portion 177 and the drive circuit 146b are housed in the main body portion 146 of the panel device 102 together with the spherical portion 169. For example, as shown in FIG. 7, the drive circuit 146b performs roller operation according to the BIT signal supplied from the data line drive circuit 112 for each row selected by the row selection signal supplied from the row selection line drive circuit 111. The part 177 is rotated. Accordingly, the spherical portion 169 is rotated, the dividing member 115 is tilted together with the columnar portion 168, and the angle of the partial surface 126 is changed to the first or second angle.

  Thus, according to this embodiment, the projected light 301in is modulated by changing the arranged partial surfaces 126 to the first or second angle in accordance with the BIT signal. Thereby, even when the projection light 301in is obliquely irradiated, it is possible to project a clear display image on the screen surface 10 to the observer 501 by the display light 301out which is reflected light on each partial surface 126. Become.

  In this embodiment, it is of course possible to individually drive the drive circuit 146b with individual wirings by the segment method. In particular, in the space behind the screen surface 10, there are almost no inconveniences in displaying an image even if a large number of various wirings and various elements are arranged.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and display devices with such changes are also possible. Moreover, it is included in the technical scope of the present invention.

It is a schematic plan view showing a main configuration of the display device of the first embodiment together with an observer. It is a front view (Drawing 2 (a)) of a disk shaped color filter in a specific example of a light source device concerning a 1st embodiment, and a block diagram (Drawing 2 (b)) of a specific example of a light source device containing this. It is a block diagram which shows the other specific example of the light source device which concerns on 1st Embodiment. 1 is a schematic block diagram according to an overall configuration of a display device according to a first embodiment. It is a partial expansion perspective view which shows the structure of the division member in the display apparatus of FIG. FIG. 5 is a partially enlarged exploded perspective view showing a configuration of a dividing member in the display device of FIG. 4. FIG. 5 is an electrical block diagram illustrating a circuit configuration of a panel device and a drive circuit in the display device of FIG. 4. It is a schematic side view which shows the display apparatus of 2nd Embodiment with an observer. FIG. 9 is a partially enlarged exploded perspective view (FIG. 9A) and a schematic side view thereof (FIG. 9B) showing a specific example of a dividing member in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Screen surface, 101 ... Panel apparatus, 111 ... Row selection line drive circuit, 112 ... Data line drive circuit, 116 ... Dividing member, 126 ... Partial surface, 134 ... Control signal output device, 142 ... Angle sensor, 166 ... Piezoelectric Element 201 ... light source device 212 ... projection light control device 501 ... observer

Claims (10)

Light source means for irradiating projection light;
The screen surface irradiated with the projection light is partially configured and each has an island-shaped partial surface corresponding to each pixel of a display image to be displayed on the screen, and the angle of the partial surface is A plurality of divided members arranged to be variable with respect to the screen surface,
Based on the image data, the plurality of angles of the partial surfaces are changed so that the display image is displayed on the screen surface by reflected light formed by reflecting the projection light by each of the partial surfaces. And a driving means for driving each of the divided members. The light source means is disposed at a position for projecting the projection light obliquely with respect to the screen surface,
2. The display according to claim 1, wherein the driving unit drives each of the plurality of divided members such that the reflected light is directed in a direction closer to the front side than the light source unit with respect to the screen surface. apparatus.   The driving means determines a first angle for reflecting the reflected light on the plurality of partial surfaces in the observation direction of the screen surface and a second angle for not reflecting the reflected light in the observation direction. The display device according to claim 1, wherein the plurality of divided members are driven so that the angle of the partial surface becomes the first or second angle.   4. The display device according to claim 3, wherein the driving unit determines the first and second angles using an incident angle incident on the screen surface from the light source unit as one parameter.   The said drive means determines the said 1st and 2nd angle by using the angle of the said observation direction with respect to the said screen surface as another parameter in addition to the said 1 parameter. Display device. Angle detection means for detecting the incident angle;
6. The display device according to claim 4, wherein the driving unit determines the first and second angles using the detected incident angle as the one parameter. 7. The light source means irradiates light of a predetermined plurality of colors as the projection light while sequentially switching colors at a predetermined cycle,
The driving means drives the plurality of divided members at a period corresponding to the predetermined period so that the color of the corresponding pixel constituting the display image is visually recognized by time division on each of the plurality of partial surfaces. The display device according to claim 1, wherein the display device is a display device.   The driving means includes a plurality of piezoelectric elements for each of the plurality of divided members, and each of the plurality of piezoelectric elements is configured to be extendable and contractible in a normal direction of the partial surface and to the partial surface. The plurality of divided members are driven such that the stretching force acts at a plurality of different points, and the angle of the partial surface is changed by the expansion / contraction difference between the plurality of piezoelectric elements. The display device according to claim 1, wherein the display device is a display device.   The driving means is wired behind each other behind the screen surface, and includes a plurality of row selection lines to which row selection signals are supplied and a plurality of data lines to which image signals corresponding to image data are respectively supplied. The display device according to claim 8, wherein the display device is configured to drive the plurality of piezoelectric elements in a matrix according to the row selection signal and the image signal. The plurality of piezoelectric elements are each composed of three columnar piezoelectric elements each having a tip attached to a position not on the same straight line with respect to each of the plurality of divided members. The display device described.

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