JP2010028412A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device such as a cellular phone which carries a projector function capable of performing appropriate correction corresponding to a surface on which an image is projected according to an operating condition. <P>SOLUTION: The cellular phone 100 having the function as a projector detects relation between an installation position of the cellular phone 100 and a projection surface by determining whether to perform wall surface projection or to perform desk surface projection based on detection by a pair of proximity object sensors 36a, 36b and also considering a detection result for a rotation angle of a display part 1 and an operation part 2 by detection by an angle sensor 37. Thus, since the cellular phone 100 corrects an image from a detected result, appropriate correction is performed corresponding to the surface on which the image is projected according to the operating condition as the projector. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable electronic device having a projector function capable of forming a projected image.

A mobile phone having a projector function is known, and in particular, a mobile phone having a foldable structure is known that corrects trapezoidal distortion of a projected image (see Patent Document 1). ).
JP 2006-91111 A

  However, when an image is projected by an electronic apparatus having a portable projector function such as a mobile phone, the image projection surface needs to be changed according to the usage situation, or the image is projected by the user's intention. It is conceivable to change the surface to be used.

  SUMMARY An advantage of some aspects of the invention is that it provides an electronic device such as a mobile phone equipped with a projector function capable of performing an appropriate correction corresponding to a surface on which an image is projected in accordance with a use situation.

  In order to solve the above problems, an electronic device according to the present invention is (a) an electronic device having a projector function for forming a projection image, and (b) detecting a relationship between the installation position of the electronic device and a projection surface. (C) a correction unit capable of executing any one of a plurality of different corrections on the video signal corresponding to the projection image in accordance with detection information from the detection unit, and (d) correction And an image projection unit that projects a projection image based on the video signal corrected by the unit.

  In the above electronic device, the detection unit detects the relationship between the installation position of the electronic device and the projection surface, and performs different types of correction according to the detection information from the detection unit. A corresponding image can be formed and projected. At this time, if the detection result by the detection unit is used, correction according to the projection surface can be automatically executed.

  According to another aspect of the present invention, (a) a plurality of corrections are first corrections that are trapezoidal corrections corresponding to vertical plane projections that project onto a plane perpendicular to the reference plane of the installation position; A second correction that is a trapezoidal correction corresponding to parallel plane projection that projects onto a plane parallel to the reference plane, and (b) the correction unit performs first and first corrections based on detection information from the detection unit. Decide to perform one of the two corrections. In this case, the correction unit can correct the image according to the projection angle. The plane parallel to the reference plane includes a plane that exists on the same plane as the reference plane.

  According to another aspect of the present invention, (a) an electronic device has (a1) a display unit having an image projection unit and a display screen for displaying an image, and (a2) an operation key for input. And an operation unit that supports the display unit and is disposed at the installation position; and (a3) a coupling unit that rotatably couples the display unit and the operation unit, and (b) the detection unit includes the display unit and The relationship between the installation position and the projection surface is detected from the positional relationship with the operation unit. In this case, by detecting the positional relationship between the display unit and the operation unit by the detection unit, it is possible to recognize the relationship between the installation position of the electronic device and the projection surface, and to perform appropriate image correction based on these. .

  According to another aspect of the present invention, the detection unit has a pair of proximity object sensors that are respectively arranged on the display unit so as to sandwich the image projection unit and detect the presence or absence of a proximity object on the projection direction side. In this case, it is possible to capture the situation of the surface to be projected on the projection direction side by the pair of proximity object sensors.

  Further, according to another aspect of the present invention, (a) the pair of proximity object sensors are arranged such that the distances to the connecting portions are different from each other, and (b) the correction unit is a pair of proximity object sensors. When it is detected that there is an adjacent object on the sensor side located far from the connecting part, the first correction is performed, and when it is detected that there is an adjacent object on the sensor side located closer to the connecting part. A second correction is performed. In this case, based on the detection results of a pair of proximity object sensors having different distances to the connecting portion, the situation of the projection surface determined to be a projection target surface is grasped, and the projection surface is handled. As described above, it is possible to determine which of the first and second corrections is to be performed.

  According to another aspect of the present invention, (a) the detection unit includes an angle sensor that detects a rotation angle of the display unit with respect to the operation unit having the connection unit as a rotation axis, and (b) the correction unit includes: Correction amounts for the first and second corrections are determined based on detection by the angle sensor. In this case, a necessary correction amount can be determined from the rotation angle of the display unit with respect to the operation unit.

  According to another aspect of the present invention, the image projection unit performs control to stop image projection when the angle sensor determines that the rotation angle is 0 °. When the rotation angle is 0 °, it is usually considered that the person does not intend to maintain the projection operation by the electronic device, and the image projection as a projector is automatically terminated to prevent unnecessary irradiation. Can do.

  According to another aspect of the present invention, the correction unit determines which of the first correction and the second correction is performed based on the detection information from the detection unit, and the relationship between the installation position and the projection surface. To determine the correction amount of the video signal in each correction. In this case, an accurate video signal correction amount can be determined from detection information from the detection unit.

  In order to solve the above problem, an electronic device according to the present invention is (a) an electronic device having a projector function for forming a projection image, and (b) based on a user's selection, A mode setting unit that can set any one correction mode among a plurality of correction modes corresponding to projection, and (c) a video signal corresponding to a projection image according to the correction mode set in the mode setting unit. A correction unit that can execute any one of a plurality of different corrections, and (d) an image projection unit that projects a projection image based on the video signal corrected by the correction unit.

  In the said electronic device, when projecting a projection image on a different object surface, the user can select the reflected mode setting. In this case, the image projected from the electronic device as a projector can be projected in a desired state on the target surface that the user wants to project.

  According to another aspect of the present invention, (a) the first correction is a trapezoidal correction corresponding to vertical surface projection in which the plurality of correction modes project onto a surface perpendicular to the reference surface of the installation position. A first correction mode to be executed, and a second correction mode in which a second correction that is a trapezoidal correction corresponding to parallel plane projection projected onto a plane parallel to the reference plane is executed (b) ) The correction unit determines to perform one of the first and second corrections by setting one of the first and second correction modes in the mode setting unit. In this case, the correction unit can correct the image according to the surface to be projected.

  According to another aspect of the present invention, (a) an electronic device has (a1) a display unit having an image projection unit and a display screen for displaying an image, and (a2) an operation key for input. And (a3) a connection unit that rotatably connects the display unit and the operation unit, and (a4) an operation unit that uses the connection unit as a rotation axis. An angle sensor that detects a rotation angle of the display unit; and (b) a correction unit determines a correction amount in the first and second corrections based on detection by the angle sensor. In this case, a necessary correction amount can be determined from the rotation angle of the display unit with respect to the operation unit.

  According to another aspect of the present invention, the image projection unit performs control to stop image projection when the angle sensor determines that the rotation angle is 0 °. When the rotation angle is 0 °, it is usually not intended to maintain the projection operation by the electronic device, and the image projection as a projector is automatically terminated to prevent unnecessary irradiation. Can do.

[First Embodiment]
1A to 1C are diagrams for explaining the electronic apparatus according to the first embodiment, and are external views of a mobile phone incorporating a projector function. A mobile phone 100 according to the present embodiment includes a display unit 1 having a display 26 and the like that form a display screen for displaying an image in a display area on the surface, an operation unit 2 having operation keys 12 and the like for input, and a display. 1 is provided with a connecting part 3 that connects the part 1 and the operating part 2 in a rotatable state, and can be opened and closed with the connecting part 3 as a rotation axis as shown in FIGS. It has become. That is, as shown in FIG. 1B, the rotation angle of the connecting portion 3 is 0 ° when not in use, and the range of the turning angle of the connecting portion 3 is set as shown in FIG. The display unit 1 and the operation unit 2 can be opened and closed at 0 ° to 160 °.

  FIG. 2 is a diagram illustrating an example of a state in which the mobile phone 100 is used as a projector. When the mobile phone 100 projects an image, the light beam from the projection unit 14 is emitted toward the wall surface WF that is the projection surface. A pair of proximity object sensors 36a and 36b for grasping a surface to be projected (wall surface WF in FIG. 2) as a projection surface sandwiches the projection unit 14 between the upper end side and the lower end side of the projection unit 14. Are arranged as follows. Therefore, in this case, the sensor 36a is disposed farther from the connecting portion 3 and the sensor 36b is disposed closer to the connecting portion 3 of the pair of proximity object sensors 36a and 36b. Are different from each other. The pair of proximity object sensors 36a and 36b, for example, detects that a proximity object exists in the emission direction from the projection unit 14 if it detects that the light is emitted and the light is reflected and returned. . At this time, the distance to the proximity object can be measured by determining the intensity of the return light or the like. The mobile phone 100 functioning as a projector, for example, compares the detection results of the proximity objects in the sensors 36a and 36b, so that either the upper end side or the lower end side of the display unit 1 is irradiated with the projection light. It can be determined whether the side is close to the surface to be the target. That is, by using the pair of proximity object sensors 36a and 36b, it is possible to grasp the situation of the surface to be projected from the projection unit 14. For example, in the case of FIG. 2, it is detected by the sensors 36a and 36b that the distances to the surfaces to be projected are substantially equal, and based on the detection results, the mobile phone 100 serving as the reference surface is installed. It is determined that the wall surface WF, which is a surface perpendicular to the horizontal surface PF, is a surface to be projected, that is, a projection surface.

  FIG. 3 is a block diagram conceptually illustrating the internal structure of the mobile phone 100 shown in FIGS. 1 (A) to 1 (C) and the like. The mobile phone 100 has a mobile call function that enables a call while moving, and a digital data communication function that enables data communication. As a basic circuit portion 20, a communication control unit 21 and a speaker 22 are provided. A microphone 23, a key operation unit 25, a display 26, a display drive unit 27, a storage unit 28, and a main control unit 29. In addition, the cellular phone 100 includes a projector portion 30 in order to realize a function as a projector.

  In the basic circuit portion 20, the communication control unit 21 includes an antenna that enables wireless communication, and can transmit and receive a call signal and a data signal wirelessly. The speaker 22 outputs a voice signal or the like obtained by demodulating the call signal received by the communication control unit 21 as voice, and the microphone 23 converts the user's voice into an electrical signal and outputs the electrical signal to the communication control unit 21. The key operation unit 25 outputs a command signal reflecting the user's intention to operate the mobile phone 100 to the main control unit 29. The display 26 is configured by a liquid crystal display panel or the like, and performs necessary display for the user based on a drive signal input from the display drive unit 27. The display driving unit 27 generates a driving signal based on data input from the main control unit 29 and controls the display operation of the display 26. The storage unit 28 includes a ROM that stores a program for operating the mobile phone 100 and a RAM such as a work memory that temporarily stores application programs, input instructions, input data, processing results, and the like. The storage unit 28 can store the data signal captured by the communication control unit 21, and can store image data to be displayed when the projector unit 30 is operated in the image projection mode, for example.

  The projector portion 30 includes an illumination device 31 that emits illumination light, a liquid crystal light valve 32 as a light modulation unit, a display control unit 33, a projection lens device 35 as a projection unit, and a pair of proximity object sensors 36a and 36b. And an angle sensor 37 and a projector control unit 38.

  Here, the illumination device 31 includes a light source unit 31 a that generates illumination light, and a condenser lens 31 b that adjusts an incident angle of the illumination light to the liquid crystal light valve 32. The light source unit 31a includes a light emitting element 31d that generates light source light sufficient to form image light, a drive circuit thereof, and the like. The light emitting element 31d can be composed of a single LED that emits white light, but can also be composed of three or more LEDs that emit light in red, blue, and green.

  The liquid crystal light valve 32 serves as an image generating unit as a liquid crystal panel main body 32a for polarization modulation, an incident polarizing filter 32b arranged on the incident side of the liquid crystal panel main body 32a, and an emission arranged on the emission side of the liquid crystal panel main body 32a. And a polarizing filter 32c. The display control unit 33 generates a drive signal based on data input from the projector control unit 38 and controls the operation state of the liquid crystal panel main body 32a. In the liquid crystal light valve 32, the liquid crystal panel main body 32a includes a color filter, for example, in units of pixels, and enables color display. The incident polarization filter 32b is a polarizing plate that adjusts the polarization direction of illumination light incident on the liquid crystal panel body 32a, and the exit polarization filter 32c emits modulated light having a predetermined polarization direction from a light beam emitted from the liquid crystal panel body 32a. This is a polarizing plate to be taken out.

  The projection lens device 35 is a projection lens 35 a composed of one or more lenses or lens groups, and a projection unit 14 for projecting image light that has passed through the liquid crystal light valve 32 onto a screen or the like disposed in front of one end of the mobile phone 100. With. The normal line of the center position of the image forming area of the liquid crystal light valve 32 and the optical axis of the projection lens 35a coincide on the optical axis OA, and the projection light is emitted in the front direction along the optical axis OA. Is done.

  As described above, the mobile phone 100 functions as a projector that forms and projects projection light from illumination light by including the image projection unit 40 including the illumination device 31, the liquid crystal light valve 32, and the projection lens device 35. To do.

  Furthermore, the mobile phone 100 includes a pair of proximity sensor 36 a and 36 b and an angle sensor 37. As already described, the pair of proximity sensor 36a, 36b emits light and detects its return light, for example, in order to grasp the situation of the surface to be projected from the projection unit 14. The detection result is sent to the projector control unit 38. Further, the angle sensor 37 detects the rotation angle of the connecting unit 3, that is, the folding angle of the mobile phone 100, and sends the detection result to the projector control unit 38. The mobile phone 100 functioning as a projector corrects the projected image according to the installation status such as the projection angle of the mobile phone 100 based on the detection results of the sensors 36a, 36b, and 37.

  FIG. 4 is a block diagram showing the projector control unit 38 for explaining the processing of the image signal. The projector control unit 38 detects a result sensed by each of the sensors 36a, 36b, and 37, determines a surface to be an illuminated portion of the projection light as a projection surface, and sets the installation position of the mobile phone 100 with respect to the projection surface and A detection circuit 38a that calculates a projection direction and transmits it as a detection signal, and a correction unit 38b that corrects an image in accordance with the detection signal from the detection circuit 38a are provided. Further, the correction unit 38b includes a correction determination unit 38c that determines the correction content of the image, and an image correction unit that converts the video signal transmitted from the main control unit 29 in FIG. 3 according to the determination result of the correction determination unit 38c. 38d.

  First, the detection circuit 38a detects the detection result of the surface to be projected by the pair of proximity sensor 36a and 36b and the rotation angle of the display unit 1 having the connecting unit 3 as the rotation axis by the angle sensor 37. Receive the results. Then, the detection circuit 38a grasps the surface to be projected as a projection surface from the detection results received from the sensors 36a, 36b, and 37, and detects the installation position of the mobile phone 100 with respect to the projection surface. And transmitted to the correction determination unit 38c in the correction unit 38b. That is, each sensor 36a, 36b, 37 and the detection circuit 38a function as a detection unit for performing a series of detections. The correction determination unit 38c determines a correction amount for performing keystone correction of the image based on the detection signal from the detection circuit 38a, and transmits the correction determination result to the image correction unit 38d. The image correction unit 38d converts the video signal transmitted from the main control unit 29 in FIG. 3 into a corrected image signal based on the determination result in the image correction unit 38d, and transmits the corrected image signal to the display control unit 33 in FIG. In the present embodiment, in particular, the determination of the correction content in the correction determination unit 38c is performed based on the detection results of the pair of proximity object sensors 36a and 36b. That is, the detection circuit 38a discriminates a projection surface that is a surface to be projected from the detection results of the pair of proximity object sensors 36a and 36b, and a projection method is selected according to the projection surface. More specifically, in the detection circuit 38a, it is determined that the projection surface is a wall surface WF (see FIG. 5A) that is perpendicular to the horizontal surface PF serving as a reference surface and faces the display unit 1. Then, vertical projection (hereinafter referred to as wall projection) is performed. On the other hand, if it is determined that the projection surface is a desk surface DF (see FIG. 6A) horizontal to the surface PF, parallel surface projection (hereinafter referred to as desk surface projection) is performed. The correction determination unit 38c determines whether to perform the first correction corresponding to the wall surface projection or the second correction corresponding to the desk surface projection according to the above determination result.

  FIGS. 5A and 5B are diagrams for explaining an example of projection by the mobile phone 100 when performing wall surface projection. First, as shown in FIG. 5A, the operation unit 2 of the mobile phone 100 is installed on a horizontal surface PF serving as a reference surface. Further, it is assumed that the display unit 1 and the operation unit 2 are in a state where the rotation angle of the connecting unit 3 which is a rotation axis is widened as an angle θ (θ is 90 ° or more).

  5A, first, the pair of proximity object sensors 36a and 36b each emit light in a state having a certain spread angle centered on a direction perpendicular to the emission surface ES including the projection unit 14. Next, each sensor 36a, 36b detects the intensity of the light reflected and returned to the adjacent object in a state of being spread with a certain spread angle. By using the result of the detection described above, it is possible to grasp the state of the object to be approached, that is, the surface to be irradiated (the wall surface WF in the case of FIG. 5A). Here, as shown by a reciprocating arrow in FIG. 5A, when performing wall surface projection in a state where the angle θ is 90 ° or more, comparing the distance from each sensor 36a, 36b to the wall surface WF, the projection unit The distance from the sensor 36a on the upper side of 14 to the wall surface WF is shorter than the distance from the sensor 36b on the lower side of the projection unit 14 to the wall surface WF. Therefore, in the state where the angle θ is 90 ° or more, when the distances from the sensors 36a and 36b are relatively compared, it is determined that there is an adjacent object on the side of the sensor 36a located farther from the connecting portion 3. For example, it is possible to determine that the surface to be projected is a wall surface WF perpendicular to the horizontal surface PF, that is, the projection surface is determined to be the wall surface WF. Further, in this case, when the wall surface projection is performed as it is on the wall surface WF perpendicular to the horizontal surface PF, a wide trapezoidal projection image P1 is formed on the lower side as shown by a solid line in FIG. In other words, the degree of deformation of the trapezoid increases as the value of the angle θ increases, and the necessary correction amount indicated by the reciprocating arrow in FIG. 5B also increases.

  FIGS. 6A and 6B are diagrams for explaining an example of projection by the mobile phone 100 in the case of performing desk surface projection. First, as shown in FIG. 6A, the operation unit 2 of the mobile phone 100 is installed on a horizontal surface PF serving as a reference surface, and the surface to be projected is the same plane as the surface PF. It is the desk surface DF on the top. Further, it is assumed that the display unit 1 and the operation unit 2 are in a state of spreading at an angle θ (θ is 90 ° or more) with the connecting unit 3 as a rotation axis.

  As shown in FIG. 6A, when performing desk surface projection with the angle θ opened 90 ° or more, when the distances from the sensors 36a and 36b to the desk surface DF are compared, the sensor on the upper side of the projection unit 14 The distance from 36a to the desk surface DF is longer than the distance from the sensor 36b on the lower side of the projection unit 14 to the desk surface DF. Therefore, in a state where the angle θ is 90 ° or more, when the distances from the sensors 36a and 36b are relatively compared, it is determined that there is an approaching object on the side of the sensor 36b located closer to the connecting portion 3. For example, it can be determined that the surface to be projected is the desk surface DF on the same plane as the horizontal surface PF, that is, the projection surface is determined to be the desk surface DF. Further, in this case, if the desk top projection is performed directly on the desk top surface DF which is the same as the horizontal plane PF, that is, parallel to the desk top surface DF, as shown by the solid line in FIG. Therefore, the degree of deformation of the trapezoid becomes smaller as the value of the angle θ increases, and the necessary correction amount indicated by the reciprocating arrow in FIG.

  FIG. 7 is a flowchart for explaining the image projection process. First, when an instruction to start image projection is given by the user operating the key operation unit 27 or the like (step S1), the detection results of the sensors 36a, 36b, and 37 are detected by the detection circuit 38a of the projector control unit 38. A detection signal is formed based on the above and transmitted to the correction determination unit 38c (step S2). The correction determination unit 38c determines the correction content based on the detection signal. More specifically, first, determination of the value of the angle θ (including determination of whether or not the angle θ is 90 ° or more) is performed from the detection result of the angle sensor 37, and the pair of proximity sensor 36a, From the detection result at 36b, it is determined whether there is an adjacent object on the sensor 36a side farther from the connecting part 3 or an adjacent object on the sensor 36b side closer to the connecting part 3 (step S3). ). In step S3, when it is determined that there is a proximity object on the sensor 36a side, a process for correcting in the first mode, which is a trapezoidal correction corresponding to vertical projection, is performed (step S4), and the sensor 36b side is processed. When it is determined that there is an approaching object, a process for performing correction in the second mode, which is trapezoidal correction corresponding to horizontal projection, is performed (step S5). That is, in step S3, it is determined whether to perform vertical surface projection, that is, wall surface projection, or parallel surface projection, that is, desk surface projection, and in steps S4 and S5, the angle sensor 37 in the correction in each determined mode is detected. A correction amount corresponding to the value of the angle θ is determined. As described above, correction contents such as the correction amount in the keystone correction are determined, and image projection is performed using the image signal corrected by the image correction unit 38d based on the determination result (step S6).

  As described above, the mobile phone 100 according to the present embodiment grasps the projection surface based on the detection by the pair of proximity object sensors 36a and 36b, and performs wall surface projection or desk surface projection according to this. Further, the relationship between the installation position of the mobile phone 100 and the projection surface is detected by taking into account the detection result of the rotation angle between the display unit 1 and the operation unit 2 by the detection by the angle sensor 37. Since the mobile phone 100 corrects the image according to the projection angle based on the detected result, it is possible to perform appropriate correction corresponding to the surface on which the image is projected, according to the usage situation as the projector. Further, by automatically detecting the pair of proximity sensor 36a, 36b and the angle sensor 37, the cellular phone 100 automatically performs image correction. In this case, it is not necessary to project and image a calibration image for correction, and the trapezoidal distortion can be corrected with a simple configuration.

  Further, when the mobile phone 100 is used as a projector, when it is determined that the value of the angle θ is 0 °, it is determined that the mobile phone 100 is closed and the use as the projector is finished, and image projection is performed. It is also possible to perform a process for performing control to stop and automatically end the process. For example, when the value of the angle θ is less than 90 °, it may be determined that there is a surface to be projected on the ceiling, and correction in the third mode is performed to cope with this.

  In the above description, the upper limit of the range that the angle θ can take is 160 °, but the upper limit of the rotation angle is not limited to 160 °.

  Further, in addition to the above, finer regulations may be provided for using the detection results of the pair of proximity object sensors 36a and 36b and the angle sensor 37 in the image projection process. For example, in step S3 of FIG. 7, when there is no difference between the detection results of the sensor 36a and the sensor 36b, the angle θ is close to 90 ° and the rotation angle is close to the upper limit. When the value of the angle θ is close to 90 °, the process for performing the wall surface projection may be performed, and when the value of the rotation angle is close to the upper limit, the process for the desk surface projection may be performed. In addition, in step S3 in FIG. 7, when a detection result can be obtained only from one of the pair of proximity object sensors 36a and 36b, for example, it is determined that the other is at infinity and the wall projection and the desk are forcibly determined. Any one of the upper surface projections may be performed. If no detection result is obtained from any of the sensors 36a and 36b, it may be determined that projection is impossible, and image projection may not be performed.

  In addition, the light emitted from the pair of proximity object sensors 36a and 36b does not have a constant spread angle, and is emitted from each of the sensors 36a and 36b by using highly directional light (for example, laser light). You may measure a pinpoint distance about the direction perpendicular | vertical to the surface ES.

  The pair of proximity sensor 36a, 36b emits light and measures the distance by detecting the return light, but each sensor 36a, 36b emits ultrasonic waves instead of light. Then, the distance may be measured by detecting the reciprocation time of the ultrasonic wave from the injection to the return.

  Further, the projection method may be determined from only the detection result of the angle sensor 37 without providing the pair of proximity object sensors 36a and 36b. For example, a reference angle value is set as a predetermined value (for example, 135 °), and the detection circuit 38a determines whether or not the angle θ is equal to or greater than the predetermined value, or performs wall surface projection. It is good also as what determines whether upper surface projection is performed.

  Further, in the detection circuit 38a, when the value of the angle θ is less than 90 °, it is determined that the wall surface projection is performed without the possibility of performing the desk surface projection, and the first detection is performed using the detection result of only the angle sensor 37. Only the correction by the mode is performed, and the detection result by the pair of proximity object sensors 36a and 36b is also used to determine whether to perform the wall surface projection or the desk surface projection only when the value of the angle θ is 90 ° or more. Correction may be performed.

[Second Embodiment]
FIG. 8 is a block diagram conceptually illustrating the internal structure of the mobile phone according to the second embodiment, and FIG. 9 is a block diagram illustrating the structure of the projector control unit. Note that the external appearance of the mobile phone 200 according to the present embodiment is the same as that of the first embodiment shown in FIGS. 1A to 1C except that the pair of proximity sensor 36a and 36b is not included. Since it is the same as that shown, the illustration is omitted. 8 and 9, the basic circuit portion 220 and the projector portion 230 having the same reference numerals as those in FIGS. 3 and 4 have the same functions unless otherwise described. .

  In the mobile phone 200, the key operation unit 225 of the basic circuit portion 220 functions as a user selection unit, so that a user can select a mode for performing wall surface projection or desk surface projection. That is, when an operation for selecting whether to perform wall surface projection or desk surface projection is performed from the key operation unit 225 as the user selection unit in FIG. 8, a command signal for selection information is sent via the main control unit 29. It is transmitted to the correction determination unit 38c in FIG. The correction determination unit 38c determines a correction amount for performing the keystone correction of the image based on the detection signal about the detection result of the angle sensor 37 transmitted from the detection circuit 38a and the selection information, and the correction determination result Is transmitted to the image correction unit 38d. The image correction unit 38d converts the video signal transmitted from the main control unit 29 in FIG. 8 into a corrected image signal based on the determination result in the image correction unit 38d, and transmits the corrected image signal to the display control unit 33 in FIG. As described above, in the mobile phone 200, the user selects one target surface as a projection surface among different target surfaces that are candidates for the projection surface on which the projection image is projected. The key operation unit 225 functions as a mode setting unit that sets one of the first correction mode and the second correction mode reflecting the user's selection. The different target surfaces refer to a wall surface WF that is perpendicular to the horizontal surface PF serving as a reference surface and faces the display unit 1, and a desk surface DF that is horizontal to the surface PF (FIG. 5A). And FIG. 6 (A)). Each correction mode is determined corresponding to the wall surface WF and the desk surface DF. That is, in correction in each correction mode, projection on the wall surface WF (wall surface projection) and projection on the desk surface DF (desk surface projection) from the rotation angle between the display unit 1 and the operation unit 2 detected by the angle sensor 37. ) Can be determined as appropriate correction amounts.

  FIG. 10 is a flowchart for explaining the image projection process. First, when a command to start image projection is given by the user's operation of the key operation unit 27 or the like (step S101), a detection signal based on the detection result of the angle sensor 37 is detected by the detection circuit 38a of the projector control unit 38. Is formed and transmitted to the correction determination unit 38c (step S102). Further, the correction determination unit 38c confirms the mode selection by the user (step S103). That is, it is confirmed whether the mode selection of whether to perform wall surface projection or desk surface projection is performed from the key operation unit 225 as a user selection unit. When the mode selection by the user is confirmed, it is determined whether the selected mode is the first mode or the second mode (step S104). Here, the case where the first mode is selected is the mode selection for wall surface projection, and the case where the second mode is selected is the mode selection for desk surface projection. If it is determined in step S104 that the first mode has been selected, a process for correcting in the first mode, which is a trapezoidal correction corresponding to wall projection, is performed (step S105), and the second mode is selected. If it is determined that the correction has been made, a process for performing correction in the second mode, which is a trapezoidal correction corresponding to the desktop projection, is performed (step S106). That is, in step S104, it is determined whether to perform wall surface projection or desk surface projection, and in steps S105 and S106, the correction according to the value of the angle θ detected by the angle sensor 37 in the correction in each determined mode. The amount is determined. When the correction content such as the correction amount is determined as described above, image projection is performed using the image signal corrected by the image correction unit 38d based on the determination result (step S107).

  As described above, the mobile phone 200 having a function as a projector according to the present embodiment can determine whether to perform wall surface projection or desk surface projection according to the user's selection. That is, an image projected from the mobile phone 200 as a projector can be projected onto a target surface that the user wants to project.

  In the present embodiment, the mobile phone 200 may further include a pair of proximity sensor 36a, 36b shown in the mobile phone 100 of the first embodiment. In this case, for example, after the wall surface projection or the desk surface projection is performed by the determination made based on the pair of proximity object sensors 36a and 36b, the projection method is forcibly changed by the user's selection. It becomes possible.

[Third Embodiment]
FIGS. 11A and 11B are views for explaining a mobile phone according to the third embodiment. A mobile phone 300 according to the present embodiment is a modification of the first and second embodiments, and FIGS. 11A and 11B show how the mobile phone 300 is used for desk-top projection.

  11 (A) and 11 (B), the surface of the rectangular table T placed between the person α and the person β facing each other is projected on the desk surface DF, and characters are projected on the desk surface DF. A projection image P in which “A” is displayed as an image is formed. In FIG. 11A, the character “A” is easy to see for the person α who is the user of the mobile phone 300. Here, in the mobile phone 300, the screen can be switched by appropriately operating the key operation unit 12. That is, for example, as shown in FIG. 11B, by switching the image signal, the image can be rotated 180 ° as shown in the projection image P ′. In this case, the projection image P ′ is easy to see for the person β facing the person α. Further, the rotation angle of the image is not limited to 180 ° and may be various. For example, in addition to 180 ° rotation, if 90 ° rotation and 270 ° rotation are also possible, when the rectangular table T is surrounded by four people, the image is switched appropriately so that each person can easily see the image. can do. In the above case, every time the image is rotated, the image can be projected without being distorted by performing the trapezoidal correction corresponding to the rotation. That is, in more detail using FIG. 8 and FIG. 9, first, a command signal for switching images as described above (ie, an image rotated several times) from the key operation unit 225 as a user selection unit. 9 is transmitted to the correction determination unit 38c in FIG. 9 via the main control unit 29. Next, the correction determination unit 38c determines a correction amount when performing the keystone correction of the image according to the command signal. Next, the image correction unit 38d converts the video signal transmitted from the main control unit 29 into correction based on the determination result in the image correction unit 38d, and transmits the correction to the display control unit 33 in FIG. As described above, the switching display for rotating the image can be performed.

[Fourth Embodiment]
FIGS. 12A to 12C are external views for explaining the mobile phone 100 according to the fourth embodiment, and FIG. 13 is a block diagram conceptually illustrating the internal structure. A mobile phone 400 according to this embodiment is a modification of the first embodiment. Here, in particular, in mobile phone 400, display 440 that forms a display screen for displaying an image also functions as an image projection unit. That is, when the mobile phone 400 functions as a projector, the display 440 is used as an image projection unit for image projection. For this reason, a pair of proximity sensor 36a, 36b for grasping the projection plane is arranged on the upper end side and the lower end side of the projection unit 414 of the display 440 so as to sandwich the projection unit 414. 12A to 12C, in the mobile phone 400, the display unit 401 includes an upper part 401a including a projection unit 414 and a pair of proximity object sensors 36a and 36b. It is possible to rotate 180 ° around the center axis AX. That is, the display unit 401 includes a lower part 401b that can be rotated about the connecting part 3 and an upper part 401a that includes the display 440 and the sensors 36a and 36b. The upper part 401a has a central axis. Rotate around AX. Thereby, the projection unit 414 of the display 440 can be directed to the wall surface or the desk surface, and image projection as a projector using the display 440 as an image projection unit can be performed.

  FIG. 13 is a block diagram conceptually illustrating the internal structure of the mobile phone 400. The basic circuit portion 420 is the same except that the display 26 and the display driving unit 27 in the basic circuit portion 20 shown in FIG. 3 in the first embodiment are not necessary because they are shared by the projector portion 430. Since there is, description is abbreviate | omitted. Further, the projector portion 430 having the same reference numeral as that in FIG. 3 has the same function unless otherwise described, and thus the description thereof is omitted.

  In the projector portion 430, the illumination device 431 includes a light diffusing device 450 at the rear stage of the light source unit 31a. The light diffusion device 450 includes a light diffusion member 450a, a guide member 450b, and a diffusion plate driving unit 450f. The light diffusion member 450a is obtained by processing a light-transmitting plate material such as plastic into a ground glass shape, for example. Specifically, for example, the light diffusing member 450a can be obtained by performing a diffusion treatment or the like on the surface of the resin sheet, or by mixing a pigment or the like into the resin and forming it into a plate shape. The guide member 450b holds the light diffusion member 450a so as to be slidable between the light path and the retracted position retracted from the optical path of the projection light. The diffusion plate driving unit 450f operates under the control of the projector control unit 38, and moves the light diffusion member 450a forward and backward between a display position on the optical axis OA and a projector position shifted from the optical axis OA. That is, when not used as a projector, the light diffusing member 450a is disposed at the operating position (display position) on the optical path as shown by the broken line, and the illumination light generated from the light source unit 31a is diffused by the light diffusing effect of the light diffusing member 450a. Then, the light is incident on the liquid crystal light valve 32. By modulating the illumination light incident on the liquid crystal light valve 32 and displaying an image in the vicinity of the projection unit 414, the display 440 functions as one that forms a normal direct-view display screen. Further, when used as a projector, the light diffusing member 450a is disposed at a retracted position (projector position) off the optical path as shown by a solid line, and projection light is formed from illumination light generated from the light source unit 31a. By injecting the formed illumination light from the projection unit 414, the display 440 functions as a projector. When the display 440 functions as a normal display screen, the user views directly from the projection unit 414, whereas when the display 440 functions as a projector, the user is projected from the projection unit 414 on the projection surface. You will see the projected image. Therefore, the image switching process is performed together with the switching of the usage mode of the main body so that the image when the display 440 is used as a normal display screen and the image when the display 440 is used as a projector are reversed left and right. That is, for example, when a command signal for switching the usage mode of the main body is transmitted from the key operation unit 25 as a user selection unit to the projector control unit 38 via the main control unit 29, the projector control unit 38 The video signal is switched according to the command signal and transmitted to the display control unit 33. As described above, image switching display can be performed together with switching of the usage mode of the main body.

  As described above, the present invention has been described according to the embodiment, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the projection image is formed by the liquid crystal light valve 32, but the projection image can also be formed by an image generation unit including a scanning mechanism. In this case, as shown in FIG. 14, the light source unit 331a includes, for example, laser light sources 81a, 81b, and 81c for each color and mirrors 82a, 82b, and 82c for photosynthesis. The scanning mechanism includes a scanning mirror 83 and an actuator 84. The scanning means composed of the scanning mirror 83 and the actuator 84 emits a light beam L1 that forms the projection light of the display image in the front direction of the optical axis OA and its periphery.

  In the above description, the projector unit 30 is incorporated in the mobile phone 100. However, in place of the mobile phone 100, portable electronic devices such as notebook PCs, PDAs (Personal Data Assistance), and photo viewers are also described above. A similar projector portion 30 can be incorporated.

(A)-(C) are figures of the mobile telephone which is an electronic device which concerns on 1st Embodiment. It is a figure of the usage condition of the mobile telephone as a projector. It is a block diagram of the internal structure of a mobile phone. It is a block diagram about a projector control part. (A), (B) is a figure about the wall surface projection by a mobile telephone. (A), (B) is a figure about the desk surface projection by a mobile telephone. It is a flowchart figure of an image projection. 6 is a block diagram of an internal structure of a mobile phone according to a second embodiment. FIG. FIG. 10 is a block diagram of a projector control unit according to a second embodiment. FIG. 10 is a flowchart of image projection according to the second embodiment. (A), (B) is a figure explaining the image projection which concerns on 3rd Embodiment. (A)-(C) is a figure of the mobile phone concerning a 4th embodiment. FIG. 10 is a diagram for describing image projection according to a fourth embodiment. It is a figure explaining the direct-drawing type image projection method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Mobile phone 14, 414 ... Projection part 20, 220, 420 ... Basic circuit part 25, 225 ... Key operation part 26, 440 ... Display, 29 ... Main control part 30 ... Projector part 31 ... Illumination Device 31a ... Light source unit 32 ... Liquid crystal light valve 35 ... Projection lens device 36a 36b ... Proximity sensor 37 ... Angle sensor 38 ... Projector control unit 38a ... Detection circuit 38b ... Correction unit OA ... optical axis

Claims (12)

An electronic device having a projector function for forming a projected image,
A detection unit for detecting the relationship between the installation position of the electronic device and the projection surface;
A correction unit capable of executing any one of a plurality of different corrections on the video signal corresponding to the projection image in accordance with detection information from the detection unit;
An electronic device comprising: an image projection unit that projects the projection image based on the video signal corrected by the correction unit. The plurality of corrections are a first correction that is a trapezoidal correction corresponding to a vertical plane projection that projects onto a plane perpendicular to the reference plane at the installation position, and a parallel projection that projects onto a plane parallel to the reference plane. A second correction which is a trapezoidal correction corresponding to the surface projection,
The electronic device according to claim 1, wherein the correction unit determines to perform any one of the first and second corrections based on detection information from the detection unit. A display unit having the image projection unit and a display screen for displaying an image; an operation unit having an input operation key and supporting the display unit and arranged at the installation position; the display unit; A connecting portion that rotatably connects the operating portion;
The electronic device according to claim 1, wherein the detection unit detects a relationship between the installation position and a projection surface from a positional relationship between the display unit and the operation unit.   The electronic device according to claim 3, wherein the detection unit includes a pair of proximity object sensors that are respectively disposed on the display unit so as to sandwich the image projection unit and detect presence or absence of a proximity object on the projection direction side. The pair of proximity object sensors are arranged such that distances to the connecting portions are different from each other.
The correction unit performs the first correction when it is detected that there is a proximity object on the sensor side that is located farther from the connection part of the pair of proximity object sensors, and the correction part is closer to the connection part. The electronic device according to claim 4, wherein the second correction is performed when it is detected that there is an adjacent object on the sensor side. The detection unit includes an angle sensor that detects a rotation angle of the display unit with respect to the operation unit with the connection unit as a rotation axis.
The electronic device according to claim 3, wherein the correction unit determines a correction amount in the first and second corrections based on detection by the angle sensor.   The electronic device according to claim 6, wherein the image projection unit performs control to stop image projection when the angle sensor determines that the rotation angle is 0 °.   The correction unit determines which of the first and second corrections is to be executed based on detection information from the detection unit, and corrects the video signal in each correction based on the relationship between the installation position and the projection plane. The electronic device according to any one of claims 1 to 7, wherein the amount is determined. An electronic device having a projector function for forming a projected image,
Based on the user's selection, a mode setting unit that can set any one correction mode among a plurality of correction modes corresponding to projections on different target surfaces,
A correction unit capable of executing any one of a plurality of different corrections on a video signal corresponding to the projection image according to the correction mode set by the mode setting unit;
An electronic device comprising: an image projection unit that projects the projection image based on the video signal corrected by the correction unit. The plurality of correction modes include a first correction mode in which a first correction that is a trapezoidal correction corresponding to a vertical plane projection that projects onto a plane perpendicular to the reference plane of the installation position, and the reference plane A second correction mode in which a second correction, which is a trapezoidal correction corresponding to parallel plane projection that projects onto a plane parallel to
The said correction | amendment part determines to perform any one of the said 1st and 2nd correction by the setting of any one of the said 1st and 2nd correction mode in the said mode setting part. Electronics. A display unit having the image projection unit and a display screen for displaying an image; an operation unit having an input operation key and supporting the display unit and arranged at the installation position; the display unit; A connection unit that rotatably connects the operation unit; and an angle sensor that detects a rotation angle of the display unit with respect to the operation unit with the connection unit as a rotation axis.
The electronic device according to claim 9, wherein the correction unit determines a correction amount for the first and second corrections based on detection by the angle sensor.   The electronic device according to claim 11, wherein the image projection unit performs control to stop image projection when the angle sensor determines that the rotation angle is 0 °.

Images