JP2012191478A - Image display device and portable information processing apparatus with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve usability of a user when a ceiling plane is used as a screen to project a screen thereonto.SOLUTION: An image display device comprises: a projection unit which is provided with a projection angle changeable in a vertical direction; a projection angle detection section which detects the projection angle of the projection unit; a screen correction unit which corrects trapezoidal distortion of a screen and inverts the screen; and an operation instruction section which instructs a first processing to a correction amount of the trapezoidal distortion correction and a second processing to invert the screen. When the projection angle detected by the projection angle detection section is a prescribed projection angle or less, the operation instruction section instructs the screen correction unit to perform the first processing by a user operation. When the projection angle detected by the projection angle detection section is more than a prescribed projection angle, the operation instruction section instructs the screen correction unit to perform the second processing by a user operation.

Description

  The present invention relates to an image display device having a function of correcting trapezoidal distortion that occurs when a screen is projected from an oblique direction with respect to a screen, and a portable information processing device including the image display device.

  In an image display device that projects a screen onto a screen, there is no problem when projecting the screen from the side, but when the screen is projected from an oblique direction with respect to the screen, the rectangular output screen is distorted into a trapezoidal shape. So-called trapezoidal distortion occurs. Therefore, trapezoidal distortion correction (keystone correction) is performed to convert the rectangular output screen into a trapezoidal distortion that is opposite to the trapezoidal distortion that occurs on the projection screen on the screen, thereby creating a rectangular screen with no distortion on the screen. Can be displayed.

  Such trapezoidal distortion correction can be configured so that the user manually adjusts while looking at the screen on the screen. However, since the adjustment work is troublesome, the keystone distortion correction is automatically performed and the user can There is known a technique that eliminates manual adjustment (see Patent Documents 1 and 2). In this technique, an installation angle when the image display device itself is installed in an inclined state is detected by a sensor, and trapezoidal distortion correction corresponding to the installation angle is performed.

Japanese Patent Laid-Open No. 9-270979 JP 2006-14233 A

  Now, in the prior art, the image display device itself is installed in an inclined state, but if the projection unit of the image display device is rotatably provided in the main body so as to greatly change the projection angle, In addition to projecting the screen with the wall surface as the screen, it is also possible to project the screen with the ceiling surface as the screen, which can improve convenience.

  However, depending on the positional relationship between the user looking up at the ceiling from the bottom and the screen, the screen may appear in the opposite direction. In this case, the image display device is moved or rotated so that the user can easily see the screen. A new problem arises in that work is required and user convenience is impaired.

  The present invention has been devised in order to solve such problems of the prior art, and its main purpose is to improve user convenience when projecting a screen with the ceiling surface as a screen. An object of the present invention is to provide an image display device configured to be able to be used and a portable information processing device including the image display device.

  An image display device according to the present invention includes a projection unit provided so that the projection angle can be changed in the vertical direction, a projection angle detection unit that detects the projection angle of the projection unit, a keystone distortion of the screen, and an inversion of the screen. A projection correction angle, a screen correction unit that performs a process to be performed, and an operation instruction unit that instructs a first process to change a correction amount for keystone distortion correction and a second process to perform a process to invert the screen. When the detection unit detects a predetermined projection angle or less, the operation instruction unit instructs the screen correction unit to perform the first processing by a user operation, and the projection angle detection unit When it is detected that a predetermined projection angle has been exceeded, the operation instruction unit instructs the screen correction unit to perform the second process by a user operation.

  According to another aspect of the present invention, there is provided a portable information processing device including the image display device, wherein the image display device is accommodated in a drive bay formed in a main body of the portable information processing device.

  According to the present invention, when a screen is projected using the ceiling surface as a screen, the screen can be reversed and displayed as required by the user. Therefore, the screen projected on the ceiling surface for the user looking up from below. Is easy to see, and user convenience can be improved. In addition, since the operation instruction unit for performing the operation of changing the correction amount of the trapezoidal distortion correction is also used for switching the display mode, it is not necessary to provide a special operation instruction unit for switching the display mode, which reduces the manufacturing cost. The rise can be suppressed.

The perspective view which shows the example which incorporated the image display apparatus 1 by this invention in the portable information processing apparatus 2 Schematic configuration diagram of an optical engine unit 21 built in the optical engine unit 13 The block diagram which shows schematic structure of the image display apparatus 1 The perspective view which shows the image display apparatus 1 The figure which shows the image display apparatus 1 and the portable information processing apparatus 2 Side view showing a situation where the screen is projected obliquely upward with the wall surface 101 as a screen Side view showing a situation in which the screen is projected obliquely upward with the ceiling surface 102 as a screen The figure which shows the relationship between the correction coefficient used when performing keystone distortion correction, and the projection angle θ Diagram showing screen status in case of wall projection The figure which shows the condition of the screen in ceiling surface projection The perspective view which shows the example which reversely displays the screen in the case of ceiling surface projection Flow chart showing a procedure of processing when operating the operation buttons 78 and 79 for correcting keystone distortion Diagram showing the relationship between the projection angle and correction coefficient in the reverse display mode The figure which shows the condition of the screen in the reverse display mode in ceiling surface projection Flow chart showing the procedure for processing to return to the standard display mode according to the projection angle

  A first aspect of the invention made to solve the above problems is a projection unit provided so that the projection angle can be changed in the vertical direction, a projection angle detector for detecting the projection angle of the projection unit, and a trapezoidal distortion of the screen. An operation instructing unit for instructing a first process for changing the correction amount of the trapezoidal distortion correction and a second process for performing a process for inverting the screen; When the projection angle detection unit detects a predetermined projection angle or less, the operation instruction unit instructs the screen correction unit to perform the first process by a user operation. The operation instruction unit instructs the screen correction unit to perform the second process by a user operation when the projection angle detection unit detects that the projection angle exceeds a predetermined projection angle. To do. According to a second aspect of the present invention, the projection unit is provided so as to be vertically changeable so that a screen can be projected using the wall surface and the ceiling surface as a screen, and the projection angle detection unit is a predetermined ceiling surface. When a projection angle determined to be projection is detected, the operation instruction unit instructs the screen correction unit to perform the second process by a user operation.

  According to this, when projecting a screen with the ceiling surface as a screen, the screen can be reversed and displayed as required by the user, so that it is easy for the user looking up from the bottom to see the screen projected on the ceiling surface. Therefore, user convenience can be improved. In addition, since the operation instruction unit for performing the operation of changing the correction amount of the trapezoidal distortion correction is also used for switching the display mode, it is not necessary to provide a special operation instruction unit for switching the display mode, which reduces the manufacturing cost. The rise can be suppressed.

  According to a third aspect of the present invention, the image display device is provided, and the image display device is accommodated in a drive bay formed in a main body of the portable information processing device.

  According to this, the convenience of the portable information processing apparatus can be improved.

  According to a fourth aspect of the present invention, there is provided a movable body constituted by the projection unit and a support unit that supports the projection unit so as to be pivotable in the vertical direction via a hinge portion. It is provided.

  According to this, by pulling out the movable body from the main body of the portable information processing device, the projection unit can be greatly rotated to greatly change the projection angle, which enables ceiling surface projection in addition to wall surface projection become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an example in which an image display device 1 according to the present invention is built in a portable information processing device 2. The portable information processing device 2 includes a main body 3 in which a control board (not shown) on which a CPU, a memory, and the like are mounted, and a display unit 4 including a liquid crystal panel. The display unit 4 is connected to the hinge unit 5 so that portability is enhanced by folding the main body unit 3 and the display unit 4.

  A keyboard 6 and a touch pad 7 are provided on the upper surface 8 a of the housing 8 of the main body 3. Also, on the back side of the keyboard 6 in the housing 8 of the main body 3, peripheral devices such as an optical disk device (one that records and reproduces information on an optical disk such as a Blu-ray disc, DVD and CD) can be replaced. A storage space, so-called drive bay, is formed, and the image display device 1 is attached to the drive bay.

  The image display device 1 includes a housing 11 and a movable body 12 provided so as to be able to be taken in and out of the housing 11. The movable body 12 accommodates an optical engine unit (projection unit) 13 in which optical components for projecting the screen 16 onto the screen 15 are accommodated, and a substrate for controlling the optical components in the optical engine unit 13. And a control unit (support unit) 14.

  FIG. 2 is a schematic configuration diagram of the optical engine unit 21 built in the optical engine unit 13. The optical engine unit 21 includes a green laser light source device 22 that outputs green laser light, a red laser light source device 23 that outputs red laser light, a blue laser light source device 24 that outputs blue laser light, and a video signal. The liquid crystal reflection type light modulation element 25 that modulates the laser light from each of the laser light source devices 22 to 24, and the laser light from each of the laser light source devices 22 to 24 is reflected and irradiated to the light modulation element 25. A polarization beam splitter 26 that transmits the modulated laser light emitted from the modulation element 25, a relay optical system 27 that guides the laser light emitted from each of the laser light source devices 22 to 24 to the polarization beam splitter 26, and the polarization beam splitter 26 are provided. And a projection optical system 28 that projects the transmitted modulated laser light onto a screen.

  The optical engine unit 21 displays a color image by a so-called field sequential method. Laser beams of each color are sequentially output from the laser light source devices 22 to 24 in a time-sharing manner, and an image by the laser beam of each color is visually displayed. It is recognized as a color image by the afterimage effect.

  The relay optical system 27 includes collimator lenses 31 to 33 that convert the laser beams of the respective colors emitted from the laser light source devices 22 to 24 into parallel beams, and the laser beams of the respective colors that have passed through the collimator lenses 31 to 33 in a predetermined direction. First and second dichroic mirrors 34 and 35 guided to, a diffusion plate 36 for diffusing the laser light guided by the dichroic mirrors 34 and 35, and a field lens for converting the laser light that has passed through the diffusion plate 36 into a convergent laser 37.

  If the side from which the laser light is emitted from the projection optical system 28 toward the screen is the front side, the blue laser light is emitted backward from the blue laser light source device 24, and the green laser is emitted with respect to the optical axis of the blue laser light. The green laser light and the red laser light are emitted from the green laser light source device 22 and the red laser light source device 23 so that the optical axis of the light and the optical axis of the red laser light are orthogonal to each other. And the green laser light are guided to the same optical path by the two dichroic mirrors 34 and 35. That is, the blue laser light and the green laser light are guided to the same optical path by the first dichroic mirror 34, and the blue laser light, the green laser light, and the red laser light are guided to the same optical path by the second dichroic mirror 35.

  The first and second dichroic mirrors 34 and 35 are formed with films for transmitting and reflecting laser light of a predetermined wavelength on the surface, and the first dichroic mirror 34 transmits blue laser light. And reflects the green laser light. The second dichroic mirror 35 transmits red laser light and reflects blue laser light and green laser light.

  Each of these optical members is supported by the housing 41. The housing 41 functions as a radiator that dissipates heat generated by the laser light source devices 22 to 24, and is formed of a material having high thermal conductivity such as aluminum or copper.

  The green laser light source device 22 is attached to an attachment portion 42 formed on the housing 41 in a state of protruding toward the side. The attachment portion 42 is provided in a state of protruding in a direction perpendicular to the side wall portion 44 from a corner portion where the front wall portion 43 and the side wall portion 44 that are respectively positioned in front and side of the accommodation space of the relay optical system 27 intersect. ing. The red laser light source device 23 is attached to the outer surface side of the side wall 44 while being held by the holder 45. The blue laser light source device 24 is attached to the outer surface side of the front wall portion 43 while being held by the holder 46.

  The red laser light source device 23 and the blue laser light source device 24 are configured by a so-called CAN package, and the optical axis is positioned on the central axis of the can-shaped exterior portion with the laser chip that outputs the laser light supported by the stem. The laser beam is emitted from a glass window provided in the opening of the exterior part. The red laser light source device 23 and the blue laser light source device 24 are fixed to the holders 45 and 46 by, for example, press-fitting into the mounting holes 47 and 48 formed in the holders 45 and 46. The heat generated by the laser chips of the blue laser light source device 24 and the red laser light source device 23 is transmitted to the housing 41 through the holders 45 and 46 to be dissipated, and each of the holders 45 and 46 has a thermal conductivity such as aluminum or copper. It is made of a high material.

  The green laser light source device 22 includes a semiconductor laser 51 that outputs excitation laser light, a FAC (Fast-Axis Collimator) lens 52 that is a condensing lens that condenses the excitation laser light output from the semiconductor laser 51, and a rod. A lens 53, a solid-state laser element 54 that outputs a basic laser beam (infrared laser beam) when excited by an excitation laser beam, and converts a wavelength of the basic laser beam to output a half-wavelength laser beam (green laser beam) A wavelength conversion element 55, a concave mirror 56 that forms a resonator together with the solid-state laser element 54, a glass cover 57 that prevents leakage of excitation laser light and fundamental wavelength laser light, and a base 58 that supports each part, And a cover body 59 that covers each part.

  The green laser light source device 22 is fixed by attaching the base 58 to the mounting portion 42 of the housing 41, and a required width (for example, 0.5 mm) between the green laser light source device 22 and the side wall portion 44 of the housing 41. The following gaps are formed. This makes it difficult for the heat of the green laser light source device 22 to be transmitted to the red laser light source device 23, suppresses the temperature rise of the red laser light source device 23, and allows the red laser light source device 23 with poor temperature characteristics to operate stably. Can do. Further, in order to secure a required optical axis adjustment allowance (for example, about 0.3 mm) of the red laser light source device 23, a required width (for example, 0.3 mm or more) is provided between the green laser light source device 22 and the red laser light source device 23. ) Is provided.

  FIG. 3 is a block diagram illustrating a schematic configuration of the image display apparatus 1. FIG. 4 is a perspective view showing the image display device 1. FIG. 4A shows a storage state in which the movable body 12 is stored in the housing 11, and FIG. 4B shows the movable body 12 in the housing. 11 shows the state of use drawn from 11 respectively.

  As shown in FIG. 3, the control unit 81 of the image display device 1 is based on a laser light source control unit 82 that controls the laser light source devices 22 to 24 of each color and a video signal input from the portable information processing device 2. The light modulation element control unit 83 that controls the light modulation element 25, the power supply unit 84 that supplies the power supplied from the portable information processing device 2 to the laser light source control unit 82 and the light modulation element control unit 83, and the respective parts are summarized. And a main control unit 85 for controlling automatically. The control unit 81 is provided in the control unit 14.

  In the optical engine unit 21, in addition to the laser light source devices 22 to 24 for each color and the light modulation element 25, a photosensor 86 for detecting the amount of light incident on the light modulation element 25 and a temperature in the vicinity of the light modulation element 25 are detected. A temperature sensor 87 is provided. The optical engine unit 21 is provided in the optical engine unit 13. The optical engine unit 13 is provided with a cooling fan 88 for cooling the optical engine unit 21 in addition to the optical engine unit 21.

  In order to transmit a video signal from the power supply line for supplying power from the portable information processing device 2 and the portable information processing device 2 to the casing 11 of the image display device 1 (see also FIG. 4). The interface unit 91 to which the signal line is connected is provided, and the interface unit 91 and the control unit 14 are connected by the wiring cable 92. The wiring cable 92 has flexibility and bends and deforms so as to follow the control unit 14 when the movable body 12 is taken in and out of the housing 11.

  The control unit 14 and the optical engine unit 13 are connected by a wiring cable 93. The wiring cable 93 includes a signal line for transmitting and receiving a signal between each unit in the control unit 81 and each unit in the optical engine unit 21 and a power supply line for supplying power to the cooling fan 88 and the like. . The wiring cable 93 is also flexible, and when the optical engine unit 13 is rotated with respect to the control unit 14, the wiring cable 93 is bent and deformed as the optical engine unit 13 is rotated.

  Although the control unit 81 is provided in the control unit 14 here, a part of the control unit 81, for example, the power supply unit 84, may be provided on the housing 11 side together with the interface unit 91.

  The optical engine unit 21 in the optical engine unit 13 is provided with an acceleration sensor (projection angle detection unit) 95. The acceleration sensor 95 is used for the purpose of obtaining the projection angle, that is, the inclination angle of the optical axis of the projection light emitted from the exit window 74 of the optical engine unit 13 with respect to the horizontal direction, as shown in FIG. The acceleration sensor 95 will be described in detail later.

  As shown in FIG. 3, the control unit 81 includes a screen correction unit 96 that corrects trapezoidal distortion that occurs when the screen is projected in an oblique direction with respect to the screen. The screen correction unit 96 performs a scaler process (pixel conversion process) for converting a rectangular output screen into a trapezoidal shape opposite to the trapezoidal distortion generated in the projection screen on the screen by pixel thinning or interpolation. This trapezoidal distortion correction is performed based on the tilt angle obtained from the output signal of the acceleration sensor 95, which will be described in detail later.

  As shown in FIG. 4, each housing of the optical engine unit 13 and the control unit 14 constituting the movable body 12 has a flat box shape with a short dimension in the height direction. Sliders 71 and 72 that slide along guide rails (not shown) provided in the casing 11 are provided on both side edges of the casings of the optical engine unit 13 and the control unit 14. In operation, as indicated by an arrow A, the movable body 12 is moved in and out of the housing 11.

  The optical engine unit 13 and the control unit 14 are connected via a hinge 73, and the optical engine unit 13 is rotatably supported by the control unit 14. An exit window 74 is provided at the end of the optical engine unit 13 opposite to the hinge portion 73, and laser light that has passed through the projection optical system 28 (see FIG. 2) of the optical engine unit 21 from the exit window 74. Is emitted.

  As shown in FIG. 1, the storage space of the image display device 1 is open on the side surface of the casing 8 of the portable information processing device 2, and the side surface of the casing 8 of the portable information processing device 2 is open. The movable body 12 is taken in and out in a substantially orthogonal direction. The casing 11 of the image display device 1 is accommodated in the casing 8 of the portable information processing device 2, and in use, a part of the optical engine unit 13 and the control unit 14 is included in the casing 8 of the portable information processing device 2. It will be in the state which protruded to the side. The portable information processing device 2 is arranged so that its side faces the screen, and thus the exit window 74 provided in the optical engine unit 13 can face the screen.

  Further, the hinge portion 73 shown in FIG. 4 has an orthogonal biaxial structure. In the use state shown in FIG. 4B, the control unit 14 is supported by the guide rails of the housing 11 while the optical engine unit. 13 is completely removed from the housing 11, and the optical engine unit 13 can be rotated in the vertical direction as indicated by the arrow B. Also, as indicated by the arrow C, the front and rear direction, that is, the movable body 12 is taken in and out. The optical engine unit 13 can be rotated around the direction axis.

  An operation instruction section 75 is provided on the upper surface of the control unit 14. The operation instruction section 75 includes a power operation button 76, a brightness switching operation button 77, and two trapezoidal distortion correction. Operation buttons 78 and 79 are provided.

  FIG. 5 is a diagram showing the image display device 1 and the portable information processing device 2. FIG. 5A shows a state of the portable information processing device 2 viewed from the front, and FIG. 5B shows the portable information. The state seen from the side of processing device 2 is shown, respectively.

  As described above, the optical engine unit 13 can rotate in a direction in which the projection angle, that is, the inclination angle of the optical axis of the projection light emitted from the exit window 74 of the optical engine unit 13 with respect to the horizontal direction is changed in the vertical direction. The projection unit is supported by the control unit 14 via the hinge unit 73, and the projection angle can be adjusted by rotating the optical engine unit 21.

  The acceleration sensor 95 provided in the optical engine unit 13 is a three-axis type sensor that can detect accelerations in three directions orthogonal to each other, and is on the optical axis of the projection light emitted from the emission window 74 of the optical engine unit 13. The first direction along the second direction, the second direction along the rotation axis of the hinge 73, and the third direction orthogonal to both the first direction and the second direction are arranged to detect acceleration. Has been.

  The main control unit 85 of the control unit 81 shown in FIG. 3 calculates the projection angle θ based on the acceleration in the first direction and the third direction detected by the acceleration sensor 95, and according to the projection angle θ. The screen correction unit 96 performs processing for correcting the trapezoidal distortion of the screen. Here, when the acceleration sensor 95 is stationary, the acceleration sensor 95 detects the gravitational acceleration components in the first direction and the third direction, whereby the projection angle θ can be obtained.

  As shown in FIG. 5B, the image display device 1 is attached to the portable information processing device 2 while being tilted along the upper surface of the main body 3 on which the keyboard is disposed, and the optical engine unit. Reference numeral 13 is rotatable as indicated by an arrow C. By setting the optical engine unit 13 in the horizontal direction, the screen can be displayed in an appropriate state in which the vertical and horizontal directions of the screen are the horizontal and vertical directions, respectively. Displayed on the screen.

  FIG. 6 is a side view showing a situation in which the portable information processing apparatus 2 is placed on the placing table 100 and the screen is projected obliquely upward with the wall surface 101 as a screen. FIG. 7 is a side view showing a situation where the screen is projected obliquely upward with the ceiling surface 102 as a screen.

  As shown in FIG. 5, the optical engine unit 13 is supported by the control unit 14 so as to be rotatable in the vertical direction as indicated by an arrow B, and the projection angle is adjusted by rotating the optical engine unit 13. In particular, here, the optical engine unit 13 can be turned 90 degrees upward, and the projection angle can be changed in the range of 0 degrees to 90 degrees to change the wall surface 101 as shown in FIG. In addition to wall surface projection for projecting a screen as a screen, as shown in FIG. 7, ceiling surface projection for projecting a screen with the ceiling surface 102 as a screen can also be performed.

  As shown in FIGS. 6 and 7, when the screen is projected from the oblique direction on the wall surface 101 and the ceiling surface 10, the distance to the wall surface 101 and the ceiling surface 102 is different between the upper side and the lower side of the projection screen. A rectangular output screen is displayed on the wall surface 101 and the ceiling surface 102 in a trapezoidal shape in which the upper side and the lower side are different, and trapezoidal distortion correction for correcting trapezoidal distortion is required.

  FIG. 8 is a diagram showing the relationship between the correction coefficient used when performing trapezoidal distortion correction and the projection angle θ. Here, the projection angle θ is an inclination angle of the optical axis of the projection light emitted from the emission window 74 of the optical engine unit 13 with respect to the horizontal direction (see FIG. 5).

  The screen correction unit 96 shown in FIG. 3 performs trapezoidal distortion correction using the correction coefficient shown in FIG. 8, and here, the correction amount of the trapezoidal distortion correction is set according to the projection angle θ indicated by the output value of the acceleration sensor 95. In addition to the change, it is determined whether the projection mode is a wall projection or a ceiling projection based on the projection angle θ, and the correction direction of the trapezoidal distortion correction is changed according to the projection mode.

  The correction coefficient represents the ratio of the upper side and the lower side of the projection screen displayed in a trapezoidal shape. When the projection angle θ is 0, that is, when the screen is projected sideways, the correction coefficient is 1, and the trapezoidal distortion correction is performed. I will not. In addition, the absolute value of the correction coefficient increases as the projection angle θ increases from 0 degrees in the case of wall projection, and as the projection angle θ decreases from 90 degrees in the ceiling projection. Since the correction amount of the trapezoidal distortion correction increases in accordance with the absolute value of the correction coefficient, it is possible to appropriately correct the distortion of the screen that becomes noticeable as the projection angle θ changes.

  The sign of the correction coefficient defines the correction direction for trapezoidal distortion correction. It is positive when the upper side of the screen is compressed and negative when the lower side of the screen is compressed. A process of compressing the upper side or the lower side of the screen according to the sign of the coefficient is performed. Specifically, in the case of wall projection, the correction coefficient is positive and correction is performed to compress the upper side of the screen. In the case of ceiling projection, the correction coefficient is negative and correction is performed to compress the lower side of the screen. Is done.

  Here, the upper side or the lower side of the screen is compressed in the trapezoidal distortion correction. However, the method of correcting the trapezoidal distortion is not limited to this, and finally the projection without distortion on the screen is performed. What is necessary is just to correct | amend so that a screen is displayed, and various well-known methods can be used.

  The trapezoidal distortion correction operation buttons 78 and 79 shown in FIG. 4 are used to manually adjust the trapezoidal distortion correction. For example, the projection screen obtained by trapezoidal distortion correction that is automatically performed based on the projection angle. When the distortion remains, the fine adjustment of the trapezoidal distortion correction can be performed. One of the two operation buttons 78 and 79 is assigned to an application for increasing the correction amount for trapezoidal distortion correction, and the other is used for an application for decreasing the correction amount for trapezoidal distortion correction.

  FIG. 9 is a diagram showing an output screen of the image display apparatus 1 and a projection screen on the wall surface 101 in the case of wall surface projection in which the screen is projected obliquely upward with the wall surface 101 as a screen. FIG. 10 is a diagram illustrating an output screen of the image display apparatus 1 and a projection screen on the ceiling surface 102 in ceiling surface projection in which the screen is projected obliquely upward with the ceiling surface 102 as a screen.

  In the wall surface projection shown in FIG. 6, the distance to the wall surface 101 increases on the upper side of the projection screen. Therefore, when the rectangular output screen shown in FIG. 9A is projected onto the wall surface 101 as it is, the projection screen on the wall surface 101 has a trapezoidal shape in which the upper side is larger than the lower side, as shown in FIG. 9B. Is displayed.

  Here, when trapezoidal distortion correction is performed using the correction coefficient shown in FIG. 8, since the correction coefficient is positive in the case of wall surface projection, correction for compressing the upper side of the screen is performed, and FIG. As shown in FIG. 9D, the corrected output screen has a trapezoidal shape in which the upper side is smaller than the lower side, and when projected onto the wall surface 101 and the floor surface 103, the upper side and the lower side are shown. A rectangular screen with the same length and without distortion is displayed.

  On the other hand, in the ceiling surface projection shown in FIG. 7, the distance to the ceiling surface 102 increases on the lower side of the projection screen. Therefore, when the rectangular output screen shown in FIG. 10A is projected onto the ceiling surface 102 and the wall surface 101, as shown in FIG. 10B, the projection screen on the ceiling surface 102 and the wall surface 101 has a lower side on the upper side. A larger trapezoidal shape is displayed.

  Here, when trapezoidal distortion correction is performed using the correction coefficient shown in FIG. 8, the correction coefficient becomes negative in the case of ceiling projection, so that correction for compressing the lower side of the screen is performed, and FIG. As shown in FIG. 10C, the corrected output screen has a trapezoidal shape in which the lower side is smaller than the upper side, and when projected onto the ceiling surface 102 and the wall surface 101, as shown in FIG. A rectangular screen with the same length as the bottom is displayed.

  FIG. 11 is a perspective view illustrating an example in which a screen is reversed and displayed in the case of ceiling surface projection. When only the trapezoidal distortion correction is performed in the case of the ceiling surface projection shown in FIG. 7, a screen is displayed on the ceiling surface 102 as shown in FIG. 11A. Depending on the positional relationship, the screen may appear in the reverse direction. In this case, it is easier to see the screen when the screen is inverted as shown in FIG. Here, the inversion means that the screen is rotated 180 degrees.

  Therefore, here, the wall surface projection and the ceiling surface projection are discriminated based on the projection angle indicated by the output value of the acceleration sensor 95, and when the projection angle becomes an angle (60 degrees or more in this case) determined to be the ceiling surface projection, When the user operates the trapezoidal distortion correction operation buttons 78 and 79 shown in FIG. 4, the standard display mode for projecting in the standard display state in which the screen is not reversed as shown in FIG. As shown in (B), it is possible to switch between the reverse display mode for projecting in the reverse display state in which the screen is inverted.

  FIG. 12 is a flowchart showing a processing procedure when the operation buttons 78 and 79 for trapezoidal distortion correction are operated. Here, when one of the operation buttons 78 and 79 is pressed (Yes in ST101), the current projection angle indicated by the output value of the acceleration sensor 95 is detected (ST102), and then the current projection angle exceeds 60 degrees. It is determined whether or not (ST103). Here, when the current projection angle does not exceed 60 degrees (No in ST103), a process for changing the correction amount of the trapezoidal distortion correction is performed (ST104). On the other hand, if the current projection angle exceeds 60 degrees (Yes in ST103), it is determined that the projection is a ceiling surface projection, and switching between the standard display mode and the reverse display mode is performed (ST105).

  Here, the projection angle serving as a reference for determining the projection form is set to 60 degrees. However, the projection angle serving as the reference for determining the projection form is not limited to this, and may be determined as appropriate.

  When it is determined that the projection angle exceeds the predetermined angle and the ceiling surface is projected, the two operation buttons 78 and 79 have the same function. When either one of them is operated, the standard display mode and the reverse display are displayed. Switching to the mode is performed.

  FIG. 13 is a diagram illustrating the relationship between the projection angle and the correction coefficient in the reverse display mode. When the screen is reversed and displayed by ceiling projection, the positional relationship between the upper side and the lower side is reversed. For this reason, in the trapezoidal distortion correction in the case of ceiling projection, a correction opposite to the example shown in FIG. 8 is performed. Specifically, the correction coefficient is positive, and the correction for compressing the upper side of the screen is performed. Is called.

  FIG. 14 is a diagram illustrating a screen state in the reverse display mode in the ceiling surface projection. In the case of ceiling projection, the correction coefficient is positive, and correction is performed to compress the upper side of the screen as shown in FIG. 14 (B). Then, as shown in FIG. When the process of inverting is performed and the resulting output screen is projected onto the ceiling surface 102, as shown in FIG. 14D, a rectangular screen with no distortion and upside down is displayed.

  Note that automatic adjustment to change the amount of trapezoidal distortion correction according to the projection angle is performed regardless of the projection angle, but if the projection angle exceeds the specified angle and the ceiling is projected, Since the functions of the buttons 78 and 79 are used for switching the display mode, the operation buttons 78 and 79 cannot be used for fine adjustment of the trapezoidal distortion correction. In other words, the projection angle is approximately 90 degrees, and the trapezoidal distortion is relatively small.

  By the way, when the projection angle is smaller than the predetermined angle, the functions of the operation buttons 78 and 79 are returned to the use for changing the correction amount of the trapezoidal distortion correction, so that switching between the standard display mode and the reverse display mode cannot be performed. For this reason, when changing from ceiling projection to wall projection, if the projection angle is reduced while the reverse display mode is set, there is a problem in that the normal display mode cannot be restored in the reverse display mode.

  Therefore, in the present embodiment, the projection angle indicated by the output value of the acceleration sensor 95 is the angle (in this example, determined as wall projection) while the state is set to the reverse display mode that inverts the screen during ceiling surface projection. When the angle is less than 60 degrees, the reverse display mode is automatically switched to the standard display mode that does not reverse the screen.

  FIG. 15 is a flowchart showing a processing procedure for returning to the standard display mode in accordance with the projection angle. Here, first, the current projection angle is detected (ST201), and the current projection angle is compared with the previously detected projection angle to determine whether or not the projection angle has changed (ST202). If there is a change in the projection angle, it is next determined whether or not the current projection angle is 60 degrees or less (ST203). If the current projection angle is 60 degrees or less, it is next determined whether or not the reverse display mode is currently set (ST204). If the reverse display mode is set, the standard display mode is switched (ST205). ).

  In the present embodiment, the example in which the image display device 1 is built in the portable information processing device 2 has been described. However, the image display device 1 may be built in an electronic device such as another portable information terminal device. In the present embodiment, the image display device 1 is accommodated in the accommodation space of the portable information processing device 2 so as to be replaceable with the optical disc device. A configuration is also possible in which the device is accommodated in a state where it cannot be replaced with another device.

  Further, in the present embodiment, the projection unit that is rotatably provided to change the projection angle in the vertical direction is an optical engine unit that accommodates the entire optical engine unit. However, the projection unit in the present invention is an optical unit. Any configuration that includes at least a projection optical system that is a part of the engine unit may be used. For example, a configuration in which the projection angle is changed by a mirror that configures the projection optical system is also possible.

  In the present embodiment, the screen is projected onto the wall surface 101 and the ceiling surface 102. However, each projection mode of the wall surface projection and the ceiling surface projection according to the present invention has a screen on the wall surface and ceiling surface in the actual room. In addition to projecting the screen, the case of projecting the screen onto a screen member arranged in the vertical direction or the horizontal direction along the indoor wall surface and ceiling surface is also included.

  The image display apparatus according to the present invention and the portable information processing apparatus including the image display apparatus have an effect of improving the user-friendliness when projecting a screen with the ceiling surface as a screen, and are oblique to the screen. The present invention is useful as an image display apparatus having a function of correcting trapezoidal distortion that occurs when a screen is projected from a direction, a portable information processing apparatus including the image display apparatus, and the like.

1 Image display device 2 Portable information processing device (electronic equipment)
12 Movable body 13 Optical engine unit (projection unit)
14 Control unit (support unit)
21 Optical engine unit 73 Hinge unit 74 Exit window 75 Operation instruction units 78 and 79 Operation button 81 Control unit 95 Acceleration sensor (projection angle detection unit)
96 Screen correction unit 101 Wall surface 102 Ceiling surface

Claims (4)

A projection unit provided so that the projection angle can be changed in the vertical direction;
A projection angle detector for detecting the projection angle of the projection unit;
A screen correction unit that corrects the keystone distortion of the screen and inverts the screen;
An operation instruction unit for instructing a first process for changing the correction amount of the trapezoidal distortion correction and a second process for performing a process for inverting the screen;
When the projection angle detection unit detects a predetermined projection angle or less, the operation instruction unit instructs the screen correction unit to perform the first processing by a user operation, and the projection angle When the detection unit detects that the projection angle exceeds a predetermined angle, the operation instruction unit instructs the screen correction unit to perform the second processing by a user operation. Display device.   The projection unit is provided to be vertically changeable so that the screen can be projected with the wall surface and the ceiling surface as a screen, and the projection angle detection unit determines a projection angle determined as a predetermined ceiling surface projection. 2. The image display device according to claim 1, wherein when detected, the operation instruction unit instructs the screen correction unit to perform the second processing by a user operation.   A portable information device comprising the image display device according to claim 1, wherein the image display device is accommodated in a drive bay formed in a main body of the portable information processing device. Processing equipment.   A movable body constituted by the projection unit and a support unit that supports the projection unit so as to be pivotable in the vertical direction via a hinge portion is provided so as to be able to be taken in and out of the main body. The portable information processing apparatus according to claim 3.

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