JP2009134147A - Portable terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To magnify and project an image in a portable terminal which is readily incorporatable of a projection function inside a casing. <P>SOLUTION: In the cellular phone 1, a casing includes a body part 2b and a lid part 2c constituted being foldable about a central hinge part. A small liquid crystal panel 71, a reflecting mirror 72 and a projection lens 73 are stored in the body part 2b. A light guide 74 and a hologram screen 75 are stored inside the lid part 2c, and the lid part 2c includes a window hole 22. The light guide 74 is set switchingly drivable between a light guide state for guiding image display light to the hologram screen 75 and a light non-guiding state of not guiding light. When the body part 2b and the lid part 2c are folded, the light guide 74 goes into the light non-guiding state. At this time, the image display light emitted from the projection lens 73 is emitted out of the casing 2 as a light Lp via the window hole 22 provided in the body part 2b of the casing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mobile terminal, and more particularly to a mobile terminal having a projection function.

  Conventionally, a portable terminal including an image display unit for displaying an image, a message, or the like is known (see, for example, Patent Document 1). Since there are many small image display parts of this type of portable terminal, some users are unhappy that it is difficult to see the image displayed on the image display part.

  On the other hand, Patent Document 2 discloses a portable terminal provided with a projection lens so as to cover an image display unit. However, this type of portable terminal has a problem that it is not possible to reduce the size of the device because it is necessary to provide a projection lens outside the device.

Patent Document 3 discloses a portable terminal including a projector module for projecting an image. However, this type of portable terminal has a problem that it is not easy to incorporate a projector module in the casing of the terminal.
JP 2001-308997 A JP 2001-313702 A JP 2006-115486 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a portable terminal that can easily incorporate a projection function into a housing and can project an enlarged image. And

  In order to achieve the above object, a first aspect of the present invention provides a portable terminal including a housing, an image display unit that displays various images on a screen, and a control unit that controls each unit of the apparatus. A projection means for enlarging and projecting the projected image, a light guide for guiding image display light of the image projected by the projection means, and an image based on the image display light guided by the light guide can be visually recognized And an optical display means for displaying the image display means, and the image display means, the control means, the projection means, the light guide, and the optical display means are housed in the housing. A window hole through which light inside the housing is emitted to the outside of the housing is provided, and the light guide is in a light guiding state for guiding the image display light to the optical means; The image display light can be driven and switched to a non-light guide state that does not guide the optical display means to the optical display means, and when the light guide is in the non-light guide state, the image display light is transmitted through the window hole to the housing. It is emitted outside.

  According to a second aspect of the present invention, in the portable terminal according to the first aspect, the optical display means is a hologram screen.

  According to a third aspect of the present invention, in the portable terminal according to the second aspect, the hologram screen is a transmissive type capable of seeing through the back surface.

  According to the first aspect of the present invention, when the light guide is in a non-light guiding state, the image display light is emitted to the outside of the housing through the window hole. Therefore, since the image can be enlarged and projected onto a wall surface or the like, it is easy for the user to see the image. Further, unlike Patent Document 2 and Patent Document 3, it is not necessary to further include a projection lens and a projector module, so that the projection function can be easily incorporated into the housing.

  According to the second aspect of the present invention, since the optical display means is a hologram screen, an image is displayed as a virtual image by the hologram screen. Therefore, the entire apparatus is not bulky and can be configured to be relatively flat. It can be easily incorporated into the casing of the portable terminal.

  According to the invention of claim 3, since the hologram screen is a transmission type that can see through the back surface, the user can see the image of the terminal and can see the back side of the hologram screen. A lot of information can be obtained.

  Hereinafter, a mobile phone (mobile terminal) according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows an appearance of the mobile phone 1, and FIG. 2 is a block diagram showing an internal structure of the mobile phone 1.

  The mobile phone 1 is operated by a user, a housing 2, a communication unit 3 for transmitting and receiving data such as voice, a speaker 4 for outputting voice by a call, a microphone 5 for inputting voice, and a user. An operation unit 6 having a numeric keypad, a display unit 7 for displaying various images and the like, and a control microcomputer 10 for controlling each unit of the apparatus are provided.

  Messages, images, and the like are displayed on the display unit 7 by the control microcomputer 10. Details of the display unit 7 will be described later. The housing 2 includes a main body 2b and a lid 2c that are configured to be foldable around a central hinge portion 2a.

  A part of the microphone 5, the operation unit 6, and the display unit 7 is stored in the main body 2b. A part of the communication unit 3, the speaker 4, the operation unit 6, and the display unit 7 is stored in the lid unit 2c. Further, the lid portion 2c is provided with a window hole 22 (see FIG. 3) on the surface having the central hinge portion 2a. The window hole 22 is positioned in a straight traveling direction of light emitted from a projection lens 73 (see FIG. 3) described later.

  Next, details of the configuration of the display unit 7 will be described with reference to FIG. FIG. 3 shows a schematic side view of the mobile phone 1 in a state in which the main body 2b and the lid 2c are opened. The display unit 7 includes a small liquid crystal panel (image display means) 71 for displaying various images on a screen, a reflection mirror 72 for reflecting light, a projection lens (projection means) 73, a light guide 74, and a hologram screen. 75.

  A small liquid crystal panel 71, a reflection mirror 72, and a projection lens 73 are stored in the main body 2 b of the housing 2. A light guide 74 and a hologram screen 75 are stored in the lid portion 2 c of the housing 2.

  For the small liquid crystal panel 71, an image (for example, FLC: Ferroelectric Liquid Crystal, OCB: Optically Compensated Birefringence) that is displayed in a field sequential manner by a driver (not shown) is suitable. Is displayed as a video. Instead of the small liquid crystal panel 71, a display device that generates an image by an optical scanning device using a polygon mirror may be used.

  The reflection mirror 72 reflects the image display light of the image displayed by the small liquid crystal panel 71 and makes the reflected image display light enter the projection lens 73.

  The projection lens 73 is a convex lens that enlarges an image displayed by the small liquid crystal panel 71 and projects it on the light guide 74. In the mobile phone 1 according to the present embodiment, the projection lens 73 is provided at a position where light is emitted outward at the end of the main body 2 b of the housing 2, and the light guide 74 is provided in the housing 2. Is provided on the lid 2c side. Therefore, the image display light emitted from the projection lens 73 is incident on the end face of the light guide 74 only when the opening angle of the lid 2c with respect to the main body 2b is the predetermined angle shown in FIG. The light incident on the light guide 74 crosses at a substantially right angle and enters the light guide 74.

  Further, when the main body 2 b and the lid 2 c are folded, the image display light emitted from the projection lens 73 is emitted outside the housing 2 through the window hole 22. The light guide of the image display light when the main body 2b and the lid 2c are folded will be described later.

  The light guide 74 is formed of a transparent resin such as acrylic, and transmits the image display light incident from the projection lens 73 forward while being totally reflected on the outer peripheral surface, and is an end surface opposite to the light incident surface. To a hologram screen 75 at a predetermined angle. In addition, the light guide 74 is configured to guide the image display light incident from the projection lens 73 to the hologram screen 75 by rotating the lid 2c by the user, and the image display light to the hologram screen 75. The drive can be switched to a non-light guiding state where light is not guided. When the light guide 74 is in a non-light-guided state, that is, when the lid 2c and the main body 2b are not at a predetermined angle as described above, the image display light incident from the projection lens 73 is directed to the hologram screen 75. Cannot be emitted.

  The hologram screen 75 is created as a Lippmann hologram having light transparency and a limited observation area. Specifically, the holographic screen 75 receives image display light emitted from the light guide 74 at a predetermined angle, and as shown in FIG. 3, ahead of the line of sight S of the operator A in the area Z. On the other hand, a virtual image B is generated so as to be visible only. The angle of light emitted from the light guide 74 to the hologram screen 75 is set to be the same as the irradiation angle of the reference light in the process of creating the hologram screen 75.

  In addition, the hologram screen 75 reflects only light in a specific narrow wavelength region for each of the R (red), G (green), and B (blue) wavelength regions of the image display light emitted from the light guide 74. Generates a virtual image B, and the light LB entering from the back surface is transmitted regardless of the wavelength range. Therefore, the operator A can visually recognize the virtual image B while looking at the scene existing behind the mobile phone 1 by looking into the hologram screen 75 from the area Z. For example, the operator A can visually recognize the virtual image B while viewing the screen of the television or personal computer behind the mobile phone 1 through the hologram screen 75, so that more information can be obtained.

  Next, image display light when the main body 2b and the lid 2c are folded will be described with reference to FIG. FIG. 4 shows a schematic side view of the cellular phone 1 in a state in which the main body 2b and the lid 2c are folded. As shown in FIG. 4, when the main body 2b and the lid 2c are folded, the light guide 74 is in the non-light guiding state described above. At this time, since the window hole 22 is positioned in the traveling direction of the image display light emitted from the projection lens 73, the image display light emitted from the projection lens 73 does not enter the light guide 74 and Light Lp is emitted to the outside of the housing 2 through a window hole 22 provided in the main body 2b.

  As described above, according to the mobile phone 1 according to the present embodiment, when the main body 2b and the lid 2c are folded, that is, when the light guide 74 is in a non-light guiding state, the image display light is transmitted through the window hole 22. The light is emitted to the outside of the housing 2 via. Therefore, the image displayed on the small liquid crystal panel 71 can be enlarged and projected onto a wall surface or the like, so that the user can easily see the image. Further, unlike Patent Document 2 and Patent Document 3, it is not necessary to further include a projection lens and a projector module, so that a projection function such as the projection lens 73 can be easily incorporated into the housing 2.

  Further, since the image is displayed as a virtual image on the hologram screen 75, the mobile phone 1 can be configured to be relatively flat without bulking the entire device, and the hologram is placed inside the housing 2 of the mobile phone 1. A screen 75 or the like can be easily incorporated. In addition, since the hologram screen 75 is a transmissive type that can be seen through the back surface, the user can see the image of the mobile phone 1 and can also see the back side of the hologram screen 75, so much information. Can be obtained.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, in the above-described embodiment, an example in which the hologram screen 75 is a transmission type has been described. However, the present invention is not limited to this. It may be a hologram screen that can be switched between.

The perspective view which shows the external appearance of the mobile telephone which concerns on one Embodiment of this invention. The block diagram which shows schematic internal structure of the said mobile telephone. The schematic side view of the said cellular phone in the open state. The schematic side view of the folded state of the said mobile phone.

Explanation of symbols

1 Mobile phone (mobile terminal)
2 Housing 22 Window hole 71 Small liquid crystal panel (image display means)
73 Projection lens (projection means)
74 light guide 75 hologram screen 2b main body 2c lid

Claims (3)

A housing,
Image display means for displaying various images on the screen;
In a portable terminal comprising a control means for controlling each part of the device,
Projection means for enlarging and projecting the image displayed by the image display means;
A light guide for guiding image display light of an image projected by the projection means;
Optical display means for visibly displaying an image based on the image display light guided by the light guide,
The image display means, the control means, the projection means, the light guide, and the optical display means are stored inside the housing.
The casing is provided with a window hole for emitting light inside the casing to the outside of the casing,
The light guide is switchable between a light guide state in which the image display light is guided to the optical means and a non-light guide state in which the image display light is not guided to the optical display means,
When the light guide is in the non-light guiding state, the image display light is emitted to the outside of the casing through the window hole.   The mobile terminal according to claim 1, wherein the optical display means is a hologram screen.   The mobile terminal according to claim 2, wherein the hologram screen is of a transmissive type capable of seeing through a back surface.

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