Electronic device capable of projecting image

Abstract

The electronic device includes: a first light source emitting first light; a second light source mounted parallel to the first light source and emitting second light; a total internal reflection prism (TIR prism) mounted in front of the first light source and the second light source and refracting the first light and the second light; a first image former installed adjacent to the first surface of the total internal reflection prism, forming the first light refracted by the total internal reflection prism as first image light, and reflecting the first image light to the total internal reflection prism such that the total internal reflection prism emits the first image light; a second image former installed adjacent to one surface of the total internal reflection prism in parallel with the first image former, forming the second light refracted by the total internal reflection prism as second image light, and reflecting the second image light to the total internal reflection prism such that the total internal reflection prism emits the second image light; a beam compressor prism formed to adjust a gap between the first image light and the second image light emitted from the total internal reflection prism; and a projection lens formed to project the first image light and the second image light having the adjusted gap onto a screen.

Description

Technical Field

[0001] The present disclosure relates to an electronic device capable of projecting an image. Background Art

[0002] Electronic devices capable of projecting an image onto a screen or a wall are widely used.

[0003] An example of an electronic device capable of projecting an image is a projector.

[0004] A projector may include a light source, an image former, and projection lenses. Accordingly, when light is emitted from the light source, an image formed by the image former may be projected onto a screen or a wall through the projection lenses.

[0005] Two projectors are used to form a wide image wider than an image that can be projected by a single projector.

[0006] For example, by arranging two projectors side by side, two images or a wide image in which two images are connected may be displayed on a single screen. Summary of the Invention

[0007] Technical Solution

[0008] An electronic device according to one or more embodiments of the present disclosure may include: a first light source configured to emit first light; a second light source disposed parallel to the first light source and configured to emit second light; a total internal reflection prism disposed in front of the first light source and the second light source and configured to refract the first light and the second light; a first image former disposed adjacent to a first surface of the total internal reflection prism and configured to form the first light refracted by the total internal reflection prism into first image light and reflect the first image light to the total internal reflection prism such that the total internal reflection prism emits the first image light; a second image former disposed adjacent to the first surface of the total internal reflection prism and parallel to the first image former and configured to form the second light refracted by the total internal reflection prism into second image light and reflect the second image light to the total internal reflection prism such that the total internal reflection prism emits the second image light; a beam reducer prism configured to adjust a distance between the first image light and the second image light emitted from the total internal reflection prism; and a projection lens configured to project the first image light and the second image light with the adjusted distance onto a screen.

[0009] The beam reducer prism may be configured to adjust the distance between the first image light and the second image light such that the first image light and the second image light with the adjusted distance form one of a single image, a wide image, and a double image on the screen.

[0010] The beam reducer prism may include: a fixed prism adjacent to an exit surface of the total internal reflection prism; a movable prism spaced apart from the fixed prism; and a moving device configured to linearly move the movable prism relative to the fixed prism.

[0011] The movable prism can be positioned at a first position, a second position, and a third position. At the first position, the first image light and the second image light after distance adjustment form a single image on the screen. At the second position, the first image light and the second image light after distance adjustment form a double image on the screen. At the third position, the first image light and the second image light after distance adjustment form a wide image on the screen.

[0012] The third position can be located between the first position and the second position.

[0013] The fixed prism can include a first fixed prism and a second fixed prism spaced apart from the first fixed prism. Each of the first fixed prism and the second fixed prism can be a right-angled triangular prism. The first fixed prism and the second fixed prism can be arranged in an isosceles triangle with the bases parallel to the exit surface of the total internal reflection prism.

[0014] The movable prism can include a first movable prism and a second movable prism in contact with the first movable prism. The inclined surface of the first movable prism can face and can be parallel to the inclined surface of the first fixed prism. The inclined surface of the second movable prism can face and can be parallel to the inclined surface of the second fixed prism.

[0015] The fixed prism and the movable prism can have the same refractive index.

[0016] The fixed prism can be a triangular prism with an isosceles triangle cross-section.

[0017] The moving device can include: a moving plate on which the movable prism is disposed; and a linear motion mechanism configured to linearly move the moving plate.

[0018] Each of the first image former and the second image former can include a digital micromirror device.

[0019] The first image former and the second image former can be disposed on the same plane.

[0020] The projection lens can include a wide-angle projection lens or an ultra-wide-angle projection lens.

[0021] The electronic device can further include a housing. The first light source, the second light source, the total internal reflection prism, the beam reducer prism, and the projection lens can be disposed inside the housing.

[0022] The housing can include a display portion configured to display buttons for adjusting the beam reducer prism. Description of the Drawings

[0023] These and / or other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a view showing an electronic device according to one or more embodiments of the present disclosure.

[0025] Figure 2 is Figure 1 a side view of the electronic device.

[0026] Figure 3 is a perspective view showing a projection optical system of an electronic device according to one or more embodiments of the present disclosure.

[0027] Figure 4 is a view showing an electronic device according to one or more embodiments of the present disclosure.

[0028] Figure 5 is a functional block diagram of an electronic device according to one or more embodiments of the present disclosure.

[0029] Figure 6 is a view showing a user interface screen of a display of an electronic device according to one or more embodiments of the present disclosure.

[0030] Figure 7a is a view showing a single image projected by an electronic device according to one or more embodiments of the present disclosure.

[0031] Figure 7b is a view showing a projection according to one or more embodiments of the present disclosure Figure 7a of the relationship between a fixed prism and a movable prism of an electronic device for a single image.

[0032] Figure 8a is a view showing a double image projected by an electronic device according to one or more embodiments of the present disclosure.

[0033] Figure 8b is a view showing a projection according to one or more embodiments of the present disclosure Figure 8a of the relationship between a fixed prism and a movable prism of an electronic device for a double image.

[0034] Figure 9a is a view showing a wide image projected by an electronic device according to one or more embodiments of the present disclosure.

[0035] Figure 9b is a view showing a projection according to one or more embodiments of the present disclosure Figure 9a of the relationship between a fixed prism and a movable prism of an electronic device for a wide image.

[0036] Figure 10aIt is a view showing a wide image projected by an electronic device according to one or more embodiments of the present disclosure.

[0037] Figure 10b It is a view showing the projection according to one or more embodiments of the present disclosure Figure 10a of the relationship between the fixed prism and the moving prism of the electronic device that projects a wide image.

[0038] Figure 11a It is a view showing a wide image projected by an electronic device according to one or more embodiments of the present disclosure.

[0039] Figure 11b It is a view showing the projection according to one or more embodiments of the present disclosure Figure 11a of the relationship between the fixed prism and the moving prism of the electronic device that projects a wide image. Detailed Description

[0040] Since the embodiments of the present disclosure can apply various transformations and have various embodiments, specific embodiments will be shown in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the scope to the specific embodiments, and it should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present disclosure. In the description with reference to the drawings, the same reference numerals may be used for the same elements.

[0041] When determining that a detailed description of a relevant known function or configuration may unnecessarily obscure the gist of the present disclosure, its detailed description will be omitted.

[0042] In addition, the following embodiments can be modified in many different forms, and the scope of the technical idea of the present disclosure is not limited to the following embodiments. More precisely, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the spirit of the present disclosure to those skilled in the art.

[0043] The terms used in the present disclosure are only for describing specific embodiments and are not intended to limit the scope of the rights. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0044] In the present disclosure, expressions such as "having", "may have", "including", or "may include" indicate the existence of corresponding features (e.g., numerical values, functions, operations, or components such as parts), and do not exclude the existence of additional features.

[0045] In the present disclosure, expressions such as "A or B", "at least one of A or / and B", or "one or more of A or / and B" may include all possible combinations of the items listed together. For example, "A or B", "at least one of A or / and B", or "one or more of A or / and B" may refer to all cases: (1) including at least one A, (2) including at least one B, or (3) including both at least one A and at least one B.

[0046] When used in the present disclosure, expressions such as "first", "second", "primary", or "secondary" may modify various components, regardless of order and / or importance, and are only used to distinguish one component from other components, and do not limit the corresponding components.

[0047] In addition, terms such as "front end", "back end", "upper side", "lower side", "top end", "bottom end", etc. used in the present disclosure are defined with reference to the accompanying drawings. However, the shape and position of each component are not limited by these terms.

[0048] An object of the present disclosure is to provide an electronic device 1 capable of projecting a single image, a dual image, and a wide image with a single device.

[0049] Hereinafter, embodiments of the electronic device 1 according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0050] The electronic device 1 according to one or more embodiments of the present disclosure may be configured to project an image onto a screen or a wall. For example, the electronic device 1 according to one or more embodiments of the present disclosure may be configured as a projector.

[0051] Figure 1 is a view showing the electronic device 1 according to one or more embodiments of the present disclosure. Figure 2 is Figure 1 a side view of the electronic device 1. Figure 3 is a perspective view showing a projection optical system of the electronic device 1 according to one or more embodiments of the present disclosure.

[0052] Referring to Figure 1 、 Figure 2 and Figure 3 According to one or more embodiments of the present disclosure, the electronic device 1 may include a first light source 11, a second light source 12, a total internal reflection prism 20, a first image former 31, a second image former 32, a beam reducer prism 40, and a projection lens 80.

[0053] The first light source 11 can be configured to emit light. The first light source 11 can be formed of one of a light emitting diode (LED), a lamp, and a laser. The first light source 11 can include a color wheel. When the color wheel is provided in the first light source 11, the first light source 11 can emit colored light. Hereinafter, the light emitted from the first light source 11 is referred to as the first light.

[0054] The second light source 12 can be configured to emit light. The second light source 12 can be provided parallel to the first light source 11. The second light source 12 can be provided on the same plane as the first light source 11.

[0055] The second light source 12 can be formed in the same manner as the first light source 11. For example, the second light source 12 can be formed of one of an LED, a lamp, and a laser. The second light source 12 can include a color wheel. When the color wheel is provided in the second light source 12, the second light source 12 can emit colored light. Hereinafter, the light emitted from the second light source 12 is referred to as the second light.

[0056] The total internal reflection (TIR) prism 20 can be provided in front of the first light source 11 and the second light source 12. In other words, in the traveling direction of the light emitted from the first light source 11 and the second light source 12, the total internal reflection prism 20 can be provided in front of the first light source 11 and the second light source 12.

[0057] The total internal reflection prism 20 can be formed to guide the first light and the second light emitted from the first light source 11 and the second light source 12 to the first image former 31 and the second image former 32, and to emit the first image light and the second image light reflected by the first image former 31 and the second image former 32 toward the beam reducer prism 40.

[0058] The total internal reflection prism 20 can include an incident surface 211 on which the light emitted from the first light source 11 and the second light source 12 is incident, an image surface 212 facing the first image former 31 and the second image former 32, and an exit surface 222 from which the light reflected by the first image former 31 and the second image former 32 is emitted.

[0059] The first light emitted from the image surface 212 can be reflected by the first image former 31 to become the first image light including the image, and then can be incident on the image surface 212 again. In addition, the second light emitted from the image surface 212 can be reflected by the second image former 32 to become the second image light including the image, and then can be incident on the image surface 212 again.

[0060] The incident surface 211, the image surface 212, and the exit surface 222 of the total internal reflection prism 20 may be formed on different surfaces of the total internal reflection prism 20. Specifically, one surface of the total internal reflection prism 20 facing the first light source 11 and the second light source 12 (i.e., the incident surface 211) is different from one surface of the total internal reflection prism 20 facing the first image former 31 and the second image former 32 (i.e., the image surface 212). In addition, one surface of the total internal reflection prism 20 facing the first light source 11 and the second light source 12 (i.e., the incident surface 211) is different from one surface of the total internal reflection prism 20 from which the first image light and the second image light are emitted (i.e., the exit surface 222). In addition, one surface of the total internal reflection prism 20 facing the first image former 31 and the second image former 32 (i.e., the image surface 212) is different from one surface of the total internal reflection prism 20 from which the first image light and the second image light are emitted (i.e., the exit surface 222).

[0061] The total internal reflection prism 20 may include two prisms, namely a first prism 21 and a second prism 22.

[0062] The first prism 21 may be formed in a triangular prism shape. The second prism 22 may be formed in a triangular prism shape. The first prism 21 and the second prism 22 may be arranged such that one surface of the first prism 21 and one surface of the second prism 22 are in contact with each other.

[0063] The first surface of the first prism 21 may form the incident surface 211, and its second surface may form the image surface 212. The third surface 213 of the first prism 21 may be in contact with the first surface 221 of the second prism 22. The second surface of the second prism 22 may form the exit surface 222.

[0064] Specifically, the first light source 11 and the second light source 12 may be arranged adjacent to the first surface 211 of the first prism 21, and the first image former 31 and the second image former 32 may be arranged adjacent to the second surface 212 of the first prism 21.

[0065] The first light and the second light incident on the first surface 211 of the first prism 21 are reflected on the third surface 213 of the first prism 21 and then emitted through the second surface 212 of the first prism 21. The first light and the second light emitted through the second surface 212 of the first prism 21 are reflected by the first image former 31 and the second image former 32 arranged adjacent to the second surface 212 of the first prism 21 to form the first image light and the second image light respectively. The first image light and the second image light are incident on the second surface 212 of the first prism 21. The first image light and the second image light refer to the light including the images formed by the first image former 31 and the second image former 32 respectively.

[0066] The first image light and the second image light incident on the second surface 212 of the first prism 21 are incident on the first surface 221 of the second prism 22 through the third surface 213 of the first prism 21. The first image light and the second image light incident on the first surface 221 of the second prism 22 are emitted through the second surface 222 of the second prism 22.

[0067] The first image former 31 may be disposed adjacent to one surface 212 of the total internal reflection prism 20. In other words, the first image former 31 may be disposed adjacent to the image surface 212 of the total internal reflection prism 20 (for example, the second surface 212 of the first prism 21).

[0068] The first image former 31 may be configured to reflect the first light emitted from the first light source 11 and refracted by the total internal reflection prism 20 back to the total internal reflection prism 20. In other words, the first image former 31 may form the incident first light into first image light including an image. A digital micromirror device may be used as the first image former 31. For example, the digital micromirror device may be formed as a DMD chip.

[0069] The second image former 32 may be disposed adjacent to one surface of the total internal reflection prism 20. The second image former 32 may be disposed parallel to the first image former 31. For example, the second image former 32 may be disposed adjacent to the image surface 212 of the total internal reflection prism 20 (for example, the second surface 212 of the first prism 21) and parallel to the first image former 31.

[0070] The second image former 32 may be disposed on the same plane as the first image former 31.

[0071] The second image former 32 may be configured to reflect the second light emitted from the second light source 12 and refracted by the total internal reflection prism 20 back to the total internal reflection prism 20. In other words, the second image former 32 may form the incident second light into second image light including an image. The second image former 32 may be configured in the same manner as the first image former 31. A digital micromirror device may be used as the second image former 32. For example, the digital micromirror device may be formed as a DMD chip.

[0072] The beam reducer prism 40 may be configured to adjust the distance between the first image light and the second image light emitted from the total internal reflection prism 20. For example, the beam reducer prism 40 may be configured to form one of a single image, a wide image, and a double image on the screen by adjusting the distance between the first image light and the second image light.

[0073] The beam reducer prism 40 may include a fixed prism 50, a movable prism 60, and a moving device 70.

[0074] The fixed prism 50 may be disposed adjacent to the total internal reflection prism 20. The fixed prism 50 may be arranged such that the bottom surface of the fixed prism 50 faces the exit surface 222 of the total internal reflection prism 20.

[0075] The fixed prism 50 may be disposed adjacent to the exit surface 222 of the total internal reflection prism 20. For example, the fixed prism 50 may be disposed adjacent to the second surface 222 of the second prism 22. The fixed prism 50 is disposed at a predetermined distance from the exit surface 222 of the total internal reflection prism 20 and does not move relative to the total internal reflection prism 20.

[0076] The fixed prism 50 is formed to transmit the first image light and the second image light emitted from the total internal reflection prism 20. The fixed prism 50 may be formed to refract and emit the incident first image light and second image light.

[0077] The fixed prism 50 may be formed as two triangular prisms each having a right triangle cross-section, i.e., two right triangular prisms. In other words, the fixed prism 50 may include a first fixed prism 51 and a second fixed prism 52. Each of the first fixed prism 51 and the second fixed prism 52 may be formed as a triangular prism having a right triangle cross-section.

[0078] The first fixed prism 51 and the second fixed prism 52 may be spaced apart from each other by a predetermined distance. The first fixed prism 51 and the second fixed prism 52 may be arranged not to move relative to each other. Accordingly, the distance between the first fixed prism 51 and the second fixed prism 52 remains constant.

[0079] The first fixed prism 51 may be arranged such that its first surface 511 (i.e., the rear surface) is parallel to the exit surface 222 of the total internal reflection prism 20 and its second surface 512 (i.e., the side surface) is perpendicular to the exit surface 222 of the total internal reflection prism 20. Then, the first image light emitted from the exit surface 222 of the total internal reflection prism 20 may be incident on the first surface 511 of the first fixed prism 51 and then may be emitted through the third surface 513 (i.e., the inclined surface) of the first fixed prism 51.

[0080] The second fixed prism 52 may be arranged such that its first surface 521 (i.e., the rear surface) is parallel to the exit surface 222 of the total internal reflection prism 20 and its second surface 522 (i.e., the side surface) is perpendicular to the exit surface 222 of the total internal reflection prism 20. Then, the second image light emitted from the exit surface 222 of the total internal reflection prism 20 may be incident on the first surface 521 of the second fixed prism 52 and then may be emitted through the third surface 523 (i.e., the inclined surface) of the second fixed prism 52.

[0081] The second surface 522 of the second fixed prism 52 may be disposed adjacent to and face the second surface 512 of the first fixed prism 51. In other words, the second surface 512 of the first fixed prism 51 and the second surface 522 of the second fixed prism 52 may be disposed parallel to each other.

[0082] The first fixed prism 51 and the second fixed prism 52 may be formed identically. The first fixed prism 51 and the second fixed prism 52 may have the same refractive index. The first fixed prism 51 and the second fixed prism 52 may be formed to have the same tilt angle. For example, the angle between the first surface 511 and the inclined surface 513 of the first fixed prism 51 may be the same as the angle between the first surface 521 and the inclined surface 523 of the second fixed prism 52.

[0083] The movable prism 60 may be disposed at a predetermined distance from the fixed prism 50. The movable prism 60 may be spaced apart from the fixed prism 50 by a predetermined distance in the traveling direction of the first image light and the second image light emitted from the exit surface 222 of the total internal reflection prism 20.

[0084] The movable prism 60 may be formed to transmit the first image light and the second image light emitted from the fixed prism 50. The movable prism 60 may be formed to refract and emit the incident first image light and second image light. The exit surface 60a of the movable prism 60 may be disposed parallel to the incident surface 50a of the fixed prism 50.

[0085] The movable prism 60 may be formed as two triangular prisms each having a right triangular cross-section, i.e., two right triangular prisms. In other words, the movable prism 60 may include a first movable prism 61 and a second movable prism 62. Each of the first movable prism 61 and the second movable prism 62 may be formed as a triangular prism having a right triangular cross-section.

[0086] The first movable prism 61 and the second movable prism 62 may be disposed in contact with each other. The first movable prism 61 and the second movable prism 62 may be arranged not to move relative to each other. For example, the first movable prism 61 and the second movable prism 62 may be disposed on the movable plate 71 and move integrally. Accordingly, the distance between the first movable prism 61 and the second movable prism 62 remains unchanged.

[0087] The first moving prism 61 can be arranged such that its first surface 611 (i.e., the front surface of the first moving prism 61) is parallel to the exit surface 222 of the total internal reflection prism 20, and its second surface 612 (i.e., the side surface) is perpendicular to the exit surface 222 of the total internal reflection prism 20. The first surface 611 of the first moving prism 61 can be parallel to the rear surface 511 of the first fixed prism 51, and its second surface 612 can be parallel to the second surface 512 of the first fixed prism 51. Then, the first image light emitted from the inclined surface 513 of the first fixed prism 51 can be incident on the third surface 613 (i.e., the inclined surface) of the first moving prism 61, and thus can be emitted through the first surface 611 (i.e., the front surface) of the first moving prism 61.

[0088] The second moving prism 62 can be arranged such that the first surface 621 (i.e., the front surface) of the second moving prism 62 is parallel to the exit surface 222 of the total internal reflection prism 20, and its second surface 622 (i.e., the side surface) is perpendicular to the exit surface 222 of the total internal reflection prism 20. The first surface 621 of the second moving prism 62 can be parallel to the rear surface of the second fixed prism 52, and its second surface 622 can be parallel to the second surface 522 of the second fixed prism 52. Then, the second image light emitted from the inclined surface 523 of the second fixed prism 52 can be incident on the third surface 623 (i.e., the inclined surface) of the second moving prism 62, and thus can be emitted through the first surface 621 (i.e., the front surface) of the second moving prism 62.

[0089] The inclined surface 623 of the second moving prism 62 can be adjacent to and face the inclined surface 613 of the first moving prism 61. In other words, the vertices of the first moving prism 61 and the second moving prism 62 can be arranged to be in contact with each other. Therefore, the inclined surface 613 of the first moving prism 61 and the inclined surface 623 of the second moving prism 62 can form a groove having an isosceles triangle cross-section.

[0090] Therefore, the inclined surface 613 of the first moving prism 61 can face the inclined surface 513 of the first fixed prism 51. The inclined surface 613 of the first moving prism 61 and the inclined surface 513 of the first fixed prism 51 can be parallel to each other. Additionally, the inclined surface 623 of the second moving prism 62 can face the inclined surface 523 of the second fixed prism 52. The inclined surface 623 of the second moving prism 62 and the inclined surface 523 of the second fixed prism 52 can be parallel to each other.

[0091] The first movable prism 61 and the second movable prism 62 can be formed identically. The first movable prism 61 and the second movable prism 62 can have the same refractive index. The first movable prism 61 and the second movable prism 62 can be formed to have the same tilt angle. For example, the angle between the first surface 611 and the inclined surface 613 of the first movable prism 61 is the same as the angle between the first surface 621 and the inclined surface 623 of the second movable prism 62.

[0092] The first movable prism 61 can be formed as a right-angled triangular prism similar to the first fixed prism 51. The first movable prism 61 can have the same refractive index as that of the first fixed prism 51. When the refractive indices of the first movable prism 61 and the first fixed prism 51 are the same, the image distortion of the first image light can be minimized.

[0093] When the tilt angle of the first fixed prism 51 is the same as the tilt angle of the first movable prism 61, the phase change of the first image light passing through the first fixed prism 51 and the first movable prism 61 can be compensated.

[0094] The tilt angles of the first fixed prism 51 and the first movable prism 61 can be defined such that the marginal ray (or outermost ray) of the first image light is not totally reflected. In addition, the tilt angles of the first fixed prism 51 and the first movable prism 61 can be defined such that the marginal ray of the first image light does not form a Brewster angle.

[0095] The second movable prism 62 can be formed as a right-angled triangular prism similar to the second fixed prism 52. The second movable prism 62 can have the same refractive index as that of the second fixed prism 52. When the refractive indices of the second movable prism 62 and the second fixed prism 52 are the same, the image distortion of the second image light can be minimized.

[0096] When the tilt angle of the second fixed prism 52 is the same as the tilt angle of the second movable prism 62, the phase change of the second image light passing through the second fixed prism 52 and the second movable prism 62 can be compensated.

[0097] The tilt angles of the second fixed prism 52 and the second movable prism 62 can be defined such that the marginal ray of the second image light is not totally reflected. In addition, the tilt angles of the second fixed prism 52 and the second movable prism 62 can be defined such that the marginal ray of the second image light does not form a Brewster angle.

[0098] The moving device 70 can be configured to linearly move the movable prism 60 relative to the fixed prism 50.

[0099] The mobile device 70 can be configured to position the mobile prism 60 at at least three positions. In other words, by the mobile device 70, the mobile prism 60 can be positioned at one of a first position where the first image light and the second image light form a single image on the screen, a second position where the first image light and the second image light form a double image on the screen, and a third position where the first image light and the second image light form a wide image on the screen. The third position can be located between the first position and the second position.

[0100] The mobile device 70 can include a mobile plate 71 and a linear motion mechanism 72.

[0101] The mobile prism 60 can be disposed on the mobile plate 71. In other words, the mobile plate 71 can be formed to support the mobile prism 60. Accordingly, the mobile prism 60 is disposed on the upper surface of the mobile plate 71 and can move integrally with the mobile plate 71.

[0102] The linear motion mechanism 72 can be configured to linearly move the mobile plate 71. The linear motion mechanism 72 can be configured to linearly move the mobile plate 71 in a direction perpendicular to the exit surface 222 of the total internal reflection prism 20. In other words, the linear motion mechanism 72 can be configured to move the mobile plate 71 in a direction parallel to the image light emitted from the exit surface 222 of the total internal reflection prism 20.

[0103] For example, the linear motion mechanism 72 can include a motor, a ball screw that converts the rotation of the motor into linear motion, and an LM guide that guides the linear motion. Alternatively, a rack and pinion that converts the rotation of the motor into linear motion can be used as the linear motion mechanism 72. Alternatively, a linear shaft and a spherical bushing, a sliding mechanism, etc. for guiding linear motion can be used as the linear motion mechanism 72. Alternatively, a linear motor can be used as the linear motion mechanism 72.

[0104] However, the linear motion mechanism 72 is not limited thereto. As long as the mobile plate 71 can be linearly moved, various linear motion mechanisms 72 can be used.

[0105] The projection lens 80 is disposed in front of the beam expander prism 40 and is formed to project the first image light and the second image light onto the screen. The projection lens 80 can be formed to form an image on the screen by magnifying the first image light and the second image light emitted from the beam expander prism 40.

[0106] The projection lens 80 can be formed as any one of a normal projection lens, a wide-angle projection lens, and an ultra-wide-angle projection lens.

[0107] In the above, the fixed prism 50 of the beam expander prism 40 is formed as two right-angled triangular prisms. However, the structure of the fixed prism 50 is not limited thereto. As another example, as Figure 4As shown, the fixed prism 50 can be formed as a single triangular prism having an isosceles triangle cross-section.

[0108] Figure 4 is a view showing an electronic device according to one or more embodiments of the present disclosure.

[0109] Referring Figure 4 , the beam expander prism 40 may include a fixed prism 50, a movable prism 60, and a moving device 70.

[0110] The fixed prism 50 can be formed as a triangular prism having an isosceles triangle cross-section. The fixed prism 50 can be arranged such that the bottom surface of the isosceles triangle faces the exit surface 222 of the total internal reflection prism 20, and its vertex points in the traveling direction of the image light.

[0111] The fixed prism 50 can be formed in a shape in which a first fixed prism 51 and a second fixed prism 52 of the fixed prism 50 of the above-described embodiment are coupled to each other. In other words, the left portion 501 of the fixed prism 50 can be formed in a shape similar to the above-described first fixed prism 51, and its right portion 502 can be formed in a shape similar to the above-described second fixed prism 52.

[0112] The movable prism 60 and the moving device 70 are the same as or similar to the movable prism 60 and the moving device 70 of the beam expander prism 40 according to the above-described embodiment. Therefore, their detailed description is omitted.

[0113] The first light source 11, the second light source 12, the total internal reflection prism 20, the beam expander prism 40, and the projection lens 80 may be provided in the housing 3. The housing 3 may form the appearance of the electronic device 1.

[0114] Figure 5 is a functional block diagram of an electronic device according to one or more embodiments of the present disclosure.

[0115] Referring Figure 5 , the electronic device 1 may include a processor 90, an image adjustment unit 100, a memory 110, a user interface 120, an input / output interface 130, a communication unit 140, and a power supply 150.

[0116] The processor 90 may be electrically connected to the memory 110 and be configured to control the operation of the electronic device 1. The processor 90 may be composed of one or more processors. Specifically, the processor 90 may execute the operation of the electronic device 1 according to various embodiments of the present disclosure by executing at least one instruction stored in the memory 110.

[0117] For example, the processor 90 can project one of a single image, a dual image, and a wide image onto the screen by controlling the condenser prism 40. Specifically, the processor 90 can control the moving device 70 of the condenser prism 40 to project one of a single image, a dual image, and a wide image onto the screen. In other words, when the processor 90 controls the moving device 70 to adjust the distance between the moving prism 60 and the fixed prism 50, one of a single image, a dual image, and a wide image can be formed on the screen.

[0118] When the moving device 70 of the condenser prism 40 includes a motor, the processor 90 can control the motor to adjust the distance between the moving prism 60 and the fixed prism 50.

[0119] The processor 90 according to an embodiment can be implemented by at least one of a digital signal processor (DSP), a microprocessor, a graphics processing unit (GPU), an artificial intelligence (AI) processor, a neural processing unit (NPU), and a timing controller (TCON) for processing digital image signals. However, the processor 90 is not limited thereto and can be implemented by at least one of a central processing unit (CPU), a microcontroller unit (MCU), a microprocessing unit (MPU), a controller, an application processor (AP), a communication processor (CP), and an advanced risc machine (ARM) processor, or can be defined as the corresponding term. In addition, the processor 90 can be implemented as a system on chip (SoC) or a large scale integration (LSI) in which a processing algorithm is built in, or can be implemented as an application specific integrated circuit (ASIC) type or a field programmable gate array (FPGA) type.

[0120] The image adjustment unit 100 can perform various functions for adjusting a projected image under the control of the processor 90. For example, the image adjustment unit 100 can perform functions such as zooming, keystone correction, quick corner (four corners) keystone correction, lens shift, and the like.

[0121] Specifically, the image adjustment unit 100 can enlarge or reduce the image according to the distance from the screen (projection distance). In other words, the zoom function can be performed according to the distance from the screen. In this case, the zoom function can include a hardware method of adjusting the image size by moving a lens and a software method of adjusting the image size by cropping the image.

[0122] Meanwhile, when the zoom function is executed, the focus of the image needs to be adjusted. For example, methods for adjusting the focus include a manual focusing method, an electronic focusing method, etc. The manual focusing method refers to a method of manually focusing an image. The electronic focusing method refers to a method of automatically focusing an image using a motor built in the electronic device 1 when the zoom function is executed.

[0123] When the zoom function is executed, the image adjustment unit 100 may provide a digital zoom function through software and may provide an optical zoom function of executing the zoom function by moving a lens through a driver.

[0124] In addition, the image adjustment unit 100 may execute a trapezoid correction function. In the case of a front-projected image, when the height of the image is incorrect, the image may be deformed upward or downward. The trapezoid correction function refers to a function of correcting a deformed image. For example, when deformation occurs in the left-right direction of the image, horizontal trapezoid correction may be used for correction. When deformation occurs in the vertical direction of the image, vertical trapezoid correction may be used for correction.

[0125] The fast corner position (four-corner adjustment) trapezoid correction function refers to a function of correcting an image when the central area of the image is normal but its corner areas are unbalanced. The lens shift function refers to a function of moving the image as it is when the image is outside the screen.

[0126] On the other hand, the image adjustment unit 100 may be configured to automatically analyze the surrounding environment and the projection environment to provide the zoom / trapezoid correction / focusing function without user input. Specifically, the image adjustment unit 100 may be configured to automatically provide the zoom / trapezoid correction / focusing function based on the distance between the screen and the electronic device 1 detected by a sensor (depth camera, distance sensor, infrared sensor, illuminance sensor, etc.), information about the space where the electronic device 1 is currently located, information about the ambient light amount, etc.

[0127] The memory 110 may be configured to store at least one instruction related to the electronic device 1. In addition, an operating system (O / S) for driving the electronic device 1 may be stored in the memory 110. In addition, various software programs or applications for operating the electronic device 1 according to one or more embodiments of the present disclosure may be stored in the memory 110. The memory 110 may include a semiconductor memory such as a flash memory, a magnetic storage medium such as a hard disk, etc.

[0128] Specifically, various software modules for operating the electronic device 1 according to various embodiments of the present disclosure may be stored in the memory 110, and the processor 90 may execute the various software modules stored in the memory 110 to control the operation of the electronic device 1. In other words, the memory 110 may be accessed by the processor 90, and data may be read / written / modified / deleted / updated by the processor 90.

[0129] On the other hand, in the present disclosure, the memory 110 may refer to a memory card (e.g., a micro SD card and a memory stick) (not shown), a memory, a read-only memory (ROM) (not shown) or a random access memory (RAM) (not shown) in the processor 90 installed in the electronic device 1.

[0130] The user interface 120 may be configured to allow input of user commands. For example, the user interface 120 may include a display part 121. The display part 121 may be formed as a touch screen. The display part 121 may be provided on the outer surface of the housing 3.

[0131] Icons capable of controlling the electronic device 1 may be displayed on the display part 121. The user may operate the electronic device 1 by touching the icons. For example, as Figure 6 shown, an icon capable of controlling the beam expander prism 40 may be displayed on the display part 121.

[0132] Figure 6 is a view showing a user interface screen of the display part 121 of the electronic device 1 according to one or more embodiments of the present disclosure.

[0133] Refer to Figure 6 , a single button 1211, a double button 1212, a wide button 1213 and a wide image adjustment button 1214 may be displayed on the display part 121.

[0134] When the user touches the single button 1211, the moving prism 60 of the beam expander prism 40 moves so that a single image can be projected on the screen.

[0135] When the user touches the double button 1212, the moving prism 60 of the beam expander prism 40 moves so that a double image can be projected on the screen.

[0136] When the user touches the wide button 1213, the moving prism 60 of the beam expander prism 40 moves so that a wide image can be projected on the screen.

[0137] The wide image adjustment button 1214 may be displayed on one side of the wide button 1213. The wide image adjustment button 1214 may be configured to adjust the aspect ratio of the wide image.

[0138] The wide image adjustment button 1214 may include an up arrow and a down arrow. Touching the up arrow increases the horizontal length of the wide image, and touching the down arrow decreases the horizontal length of the wide image. Accordingly, the user may arbitrarily adjust the aspect ratio of the wide image using the wide image adjustment button 1214.

[0139] In addition, the user interface 120 may include various types of input devices. For example, the user interface 120 may include physical buttons. In this case, the physical buttons may include function keys, direction keys (e.g., four direction keys), or dial buttons. According to one embodiment, the physical buttons may be implemented as multiple keys.

[0140] According to another embodiment, the physical buttons may be implemented as a single key. Here, when the physical buttons are implemented as a single key, the electronic device 1 may receive a user input in which the single key is pressed for a critical period or longer. When receiving the user input in which the single key is pressed for a critical period or longer, the processor 90 may execute a function corresponding to the user input. For example, the processor 90 may provide one of a single image, a dual image, and a wide image by controlling the beam expander prism 40 based on the user input.

[0141] On the other hand, the electronic device 1 may be configured to receive a user input in various ways other than the above-described user interface 120. As an example, the electronic device 1 may receive a user input through an external remote control device. Here, the external remote control device may be a remote control device corresponding to the electronic device 1 (e.g., a control device dedicated to the electronic device 1) or a user's portable communication device (e.g., a smartphone or a wearable device). Here, an application for controlling the electronic device 1 may be stored in the user's portable communication device. The portable communication device may obtain a user input through the stored application and send the obtained user input to the electronic device 1. The electronic device 1 may receive the user input from the portable communication device and perform an operation corresponding to the user's control command.

[0142] The input / output interface 130 is a component for inputting / outputting at least one of an audio signal and a video signal. The input / output interface 130 may receive at least one of an audio signal and a video signal from an external device and output a control command to the external device.

[0143] On the other hand, the input / output interface 130 according to an embodiment of the present disclosure may be implemented with at least one wired input / output interface among a high-definition multimedia interface (HDMI), a mobile high-definition link (MHL), a universal serial bus (USB), a USB Type-C, a DisplayPort (DP), Thunderbolt, a video graphics array (VGA) port, an RGB port, a D-subminiature (D-SUB), and a digital video interface (DVI). According to an embodiment, the wired input / output interface 130 may be implemented as an interface for only inputting / outputting an audio signal and an interface for only inputting / outputting a video signal, or may be implemented as an interface for inputting / outputting both an audio signal and a video signal.

[0144] In addition, the electronic device 1 may receive data through the wired input / output interface 130, but this is only an example. The electronic device 1 may receive power through the wired input / output interface 130. For example, the electronic device 1 may receive power from an external battery through a USB Type-C or receive power from a socket through a power adapter. As another example, the electronic device 1 may receive power from an external device (e.g., a laptop computer or a monitor) through a DP.

[0145] The communication unit 140 may be configured to connect the electronic device 1 to a server or an external device. The communication unit 140 may be wirelessly or wiredly connected to the server or the external device.

[0146] The wired communication unit 140 may be implemented as an Ethernet module.

[0147] The wireless communication unit 140 may be implemented with at least one communication method among Wi-Fi, Wi-Fi Direct, Bluetooth, ZigBee, third generation (3G), the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), and fifth generation (5G).

[0148] According to an implementation example, the communication unit 140 may be implemented to only input / output signals for connecting to a server or an external device. Alternatively, in addition to the connection signals, the communication unit 140 may be implemented to input / output audio signals and video signals.

[0149] The power supply 150 may be configured to receive power from the outside and supply power to various components of the electronic device 1. The power supply 150 according to an embodiment of the present disclosure may receive power through various methods. As an example, the power supply 150 may receive power using a connector. In addition, the power supply 150 may receive power using a 220V DC power cord. However, the present disclosure is not limited thereto. The electronic device 1 may be configured to receive power using a USB power cord or a wireless charging method.

[0150] In addition, the power supply 150 may be configured to receive power using an internal battery or an external battery. For example, the power supply 150 may be configured to charge the internal battery using at least one of a 220V DC power cord, a USB power cord, and a USB Type-C power cord, and receive power through the charged internal battery.

[0151] In addition, the power supply 150 according to an embodiment of the present disclosure may receive power through an external battery. For example, when the electronic device 1 and the external battery are connected by various wired communication methods such as a USB power cord, a USB Type-C power cord, a household socket, etc., the power supply 150 may receive power through the external battery. In other words, the power supply 150 may directly receive power from the external battery, or may charge the internal battery through the external battery and receive power from the charged internal battery.

[0152] The power supply 150 according to the present disclosure may receive power using at least one of the various power supply methods described above.

[0153] On the other hand, the electronic device 1 according to one or more embodiments of the present disclosure may provide various smart functions.

[0154] Specifically, the electronic device 1 may be connected to a portable terminal device for controlling the electronic device 1, and may control the screen output from the electronic device 1 through a user input input from the portable terminal device. For example, the portable terminal device may be implemented as a smartphone including a touch display. The electronic device 1 may receive screen data provided by the portable terminal device from the portable terminal device, and may output the screen data. The screen output from the electronic device 1 may be controlled according to a user input input from the portable terminal device.

[0155] For example, the electronic device 1 may project one of a single image, a dual image, and a wide image onto the screen according to a user input from the portable terminal device.

[0156] The electronic device 1 may be configured to share content or music provided by the portable terminal device by connecting to the portable terminal device through various communication methods such as Miracast, Airplay, Wireless DEX, Remote PC, etc.

[0157] Hereinafter, reference will be made to Figures 7a to 11b Describe the operations of the electronic device 1 having the above structure according to one or more embodiments of the present disclosure for projecting a single image, a dual image, and a wide image onto the screen.

[0158] First, reference will be made to Figure 7a and Figure 7b,an operation of the electronic device 1 projecting a single image according to one or more embodiments of the present disclosure will be described.

[0159] Figure 7a is a view showing the single image projected by the electronic device 1 according to one or more embodiments of the present disclosure. Figure 7b is a view showing the projection according to one or more embodiments of the present disclosure Figure 7a of the relationship between the fixed prism 50 and the moving prism 60 of the electronic device 1 of the single image.

[0160] Referring to Figure 7a , one image (i.e., the single image 200) can be projected by the electronic device 1 onto the screen. The single image 200 has a horizontal length L and a vertical length H.

[0161] In this case, the moving prism 60 can be positioned as far away from the fixed prism 50 as possible.

[0162] Referring to Figure 7b , the distance between the fixed prism 50 and the moving prism 60 of the beam expander prism 40 of the electronic device 1 is D1. Therefore, D1 can be the maximum distance between the fixed prism 50 and the moving prism 60.

[0163] Here, the distance between the fixed prism 50 and the moving prism 60 refers to the distance between the incident surface 50a of the fixed prism 50 and the exit surface 60a of the moving prism 60.

[0164] The incident surface 50a of the fixed prism 50 refers to a surface of the fixed prism 50 on which the first image light A1 and the second image light A2 emitted from the total internal reflection prism 20 are incident. The incident surface 50a of the fixed prism 50 closely faces the exit surface 222 of the total internal reflection prism 20. Therefore, the incident surface 50a of the fixed prism 50 can be formed as the first surface 511 of the first fixed prism 51 and the first surface 521 of the second fixed prism 52.

[0165] The exit surface 60a of the moving prism 60 refers to a surface of the moving prism 60 from which the first image light A1 and the second image light A2 incident from the fixed prism 50 are emitted. The exit surface 60a of the moving prism 60 closely faces the projection lens 80. Therefore, the exit surface 60a of the moving prism 60 can be formed by the first surface 611 of the first moving prism 61 and the first surface 621 of the second moving prism 62.

[0166] When forming a single image on the screen, the user can touch the single button 1211 displayed on the display part 121 (see Figure 6 ).

[0167] When the single button 1211 is touched, both the first light source 11 and the second light source 12 can be turned on.

[0168] When the first light source 11 is turned on, first light is emitted from the first light source 11. The first light is incident on the incident surface of the total internal reflection prism 20. The first light incident on the total internal reflection prism 20 is reflected by the first image former 31 to form first image light A1.

[0169] When the second light source 12 is turned on, second light is emitted from the second light source 12. The second light is incident on the incident surface of the total internal reflection prism 20. The second light incident on the total internal reflection prism 20 is reflected by the second image former 32 to form second image light A2.

[0170] The first image light A1 and the second image light A2 can pass through the beam reducer prism 40 and be emitted to the projection lens 80. Specifically, the first image light A1 is refracted when passing through the first fixed prism 51 and is incident on the first moving prism 61. The second image light A2 is refracted when passing through the second fixed prism 52 and is incident on the second moving prism 62.

[0171] At this time, when the moving prism 60 is maximally away from the fixed prism 50, the first image light A1 and the second image light A2 can completely overlap with each other in the moving prism 60. The overlapping first image light A1 and second image light A2 can form image light.

[0172] The projection lens 80 can magnify the image light of the moving prism 60 passing through the beam reducer prism 40 and project it onto the screen. The image obtained by projecting the overlapping first image light A1 and second image light A2 onto the screen by the projection lens 80 is the single image 200.

[0173] When the distance between the fixed prism 50 and the moving prism 60 is D1, the single image 200 is formed on the screen. Therefore, the position of the moving prism 60 at this time can be referred to as the first position.

[0174] Next, reference will be made to Figure 8a and Figure 8b to describe the operation of the electronic device 1 projecting a dual image according to one or more embodiments of the present disclosure.

[0175] Figure 8a is a view showing the dual image projected by the electronic device 1 according to one or more embodiments of the present disclosure. Figure 8b is a view showing the relationship between the fixed prism 50 and the moving prism 60 of the electronic device 1 projecting the Figure 8a dual image according to one or more embodiments of the present disclosure.

[0176] Reference Figure 8a, two images 201 and 202 (i.e., dual images) can be projected onto a screen by an electronic device 1. The dual images 201 and 202 can be formed in the same size. The dual images 201 and 202 can be formed to have the same size as Figure 7a the single image 200. In other words, each of the dual images 201 and 202 has a horizontal length L and a vertical length H.

[0177] In this case, the movable prism 60 can be positioned as close as possible to the fixed prism 50.

[0178] Refer to Figure 8b , the distance between the fixed prism 50 and the movable prism 60 of the beam expander prism 40 of the electronic device 1 is D2. Therefore, D2 can be the minimum distance between the fixed prism 50 and the movable prism 60.

[0179] When the dual images are formed on the screen, the user can touch the dual buttons 1212 displayed on the display section 121.

[0180] When the dual buttons 1212 are touched, both the first light source 11 and the second light source 12 can be turned on.

[0181] When the first light source 11 is turned on, the first light is emitted from the first light source 11. The first light is incident on the incident surface of the total internal reflection prism 20. The first light incident on the total internal reflection prism 20 is reflected by the first image former 31 to form the first image light A1.

[0182] When the second light source 12 is turned on, the second light is emitted from the second light source 12. The second light is incident on the incident surface of the total internal reflection prism 20. The second light incident on the total internal reflection prism 20 is reflected by the second image former 32 to form the second image light A2.

[0183] The first image light A1 and the second image light A2 can pass through the beam expander prism 40 and be emitted to the projection lens 80. Specifically, the first image light A1 is refracted when passing through the first fixed prism 51 and is incident on the first movable prism 61. The second image light A2 is refracted when passing through the second fixed prism 52 and is incident on the second movable prism 62.

[0184] At this time, when the movable prism 60 is positioned as close as possible to the fixed prism 50, the first image light A1 and the second image light A2 can be completely separated from each other in the movable prism 60.

[0185] The projection lens 80 can magnify the first image light A1 and the second image light A2 of the movable prism 60 passing through the beam expander prism 40 and project them onto the screen. The image obtained by projecting the separated first image light A1 and second image light A2 onto the screen by the projection lens 80 is a double image, that is, the first image 201 and the second image 202. The first image 201 and the second image 202 can be spaced apart from each other by a predetermined distance.

[0186] When the electronic device 1 projects a double image, the two images 201 and 202 can be the same image or different images.

[0187] When the distance between the fixed prism 50 and the movable prism 60 is D2, a double image is formed on the screen. Therefore, the position of the movable prism 60 at this time can be referred to as the second position.

[0188] When the movable prism 60 is in the second position and one of the first light source 11 and the second light source 12 is turned off, only one of the first image 201 and the second image 202 can be projected on the screen.

[0189] Finally, reference will be made to Figures 9a to 11b describe the operation of the electronic device 1 projecting a wide image according to one or more embodiments of the present disclosure.

[0190] Figure 9a is a view showing a wide image projected by the electronic device 1 according to one or more embodiments of the present disclosure. Figure 9b is a view showing the relationship between the fixed prism 50 and the movable prism 60 of the electronic device 1 projecting the Figure 9a wide image according to one or more embodiments of the present disclosure.

[0191] Reference Figure 9a , an image (i.e., the wide image 203) can be projected on the screen by the electronic device 1. The wide image 203 can be larger than each of the single image 201 and the first image 202 and the second image 203 of the double image. In other words, the wide image 203 has a horizontal length L1 and a vertical length H. The vertical length H of the wide image 203 can be the same as the vertical length H of each of the single image and the double image.

[0192] Figure 9a The wide image 203 shown can have the same size as the image obtained by connecting the Figure 8a double images. In other words, the horizontal length L1 of the wide image 203 can be 2L (L1 = 2L).

[0193] In this case, the movable prism 60 can be spaced apart from the fixed prism 50 by a predetermined distance.

[0194] ReferenceFigure 9b The distance between the fixed prism 50 and the movable prism 60 of the beam expander prism 40 of the electronic device 1 is D3. D3 can be greater than the minimum distance D2 between the fixed prism 50 and the movable prism 60 and less than the maximum distance D1 between them.

[0195] When a wide image 203 is formed on the screen, the user can touch the wide button 1213 displayed on the display section 121.

[0196] When the wide button 1213 is touched, both the first light source 11 and the second light source 12 can be turned on.

[0197] When the first light source 11 is turned on, first light is emitted from the first light source 11. The first light is incident on the incident surface of the total internal reflection prism 20. The first light incident on the total internal reflection prism 20 is reflected by the first image former 31 to form first image light A1.

[0198] When the second light source 12 is turned on, second light is emitted from the second light source 12. The second light is incident on the incident surface of the total internal reflection prism 20. The second light incident on the total internal reflection prism 20 is reflected by the second image former 32 to form second image light A2.

[0199] The first image light A1 and the second image light A2 can pass through the beam expander prism 40 and be emitted to the projection lens 80. Specifically, the first image light A1 is refracted when passing through the first fixed prism 51 and is incident on the first movable prism 61. The second image light A2 is refracted when passing through the second fixed prism 52 and is incident on the second movable prism 62.

[0200] At this time, when the movable prism 60 is spaced apart from the fixed prism 50 by a certain distance, the first image light A1 and the second image light A2 can contact each other in the movable prism 60. In other words, the outermost rays of the first image light A1 and the outermost rays of the second image light A2 can contact each other.

[0201] The projection lens 80 can magnify the first image light A1 and the second image light A2 passing through the movable prism 60 of the beam expander prism 40 and project them onto the screen. The image obtained by projecting the first image light A1 and the second image light A2 that are in contact with each other onto the screen by the projection lens 80 can form the wide image 203. At this time, the aspect ratio of the wide image 203 is L1:H (=2L:H).

[0202] Figure 10a is a view showing the wide image 203 projected by the electronic device 1 according to one or more embodiments of the present disclosure. Figure 10b is a view showing the projection according to one or more embodiments of the present disclosure Figure 10aView of the relationship between the fixed prism 50 and the movable prism 60 of the electronic device 1 for a wide image.

[0203] Reference Figure 10a , an image (i.e., the wide image 203) can be projected onto the screen by the electronic device 1. The wide image 203 can be larger than each of the single image 201 and the first image 202 and the second image 203 of the double image. In other words, the wide image 203 has a horizontal length L2 and a vertical length H. The vertical length H of the wide image 203 can be the same as the vertical length H of each of the single image and the double image.

[0204] Figure 10a The wide image 203 shown can have a smaller size than Figure 9a The wide image 203 shown. In other words, Figure 10a The horizontal length L2 of the wide image 203 of Figure 9a Can be less than the horizontal length L1 (L2 < L1 = 2L) of the wide image 203 of

[0205] In this case, the movable prism 60 can be spaced apart from the fixed prism 50 by a certain distance.

[0206] Reference Figure 10b , the distance between the fixed prism 50 and the movable prism 60 of the beam expander prism 40 of the electronic device 1 is D4. D4 can be greater than the minimum distance D2 between the fixed prism 50 and the movable prism 60, and less than the maximum distance D1 between them. In addition, D4 can be greater than the distance D3 (D4 > D3) between the fixed prism 50 and the movable prism 60 that forms Figure 9a The wide image 203 shown.

[0207] When forming Figure 10a The wide image 203 on the screen, the user can touch the wide button 1213 displayed on the display section 121. In addition, the user can adjust the aspect ratio of the wide image 203 by touching the wide image adjustment button 1214.

[0208] When the wide button 1213 is touched, when the wide image 203 is formed on the screen, both the first light source 11 and the second light source 12 can be turned on.

[0209] When the first light source 11 is turned on, the first light is emitted from the first light source 11. The first light is incident on the incident surface of the total internal reflection prism 20. The first light incident on the total internal reflection prism 20 is reflected by the first image former 31 to form the first image light A1.

[0210] When the second light source 12 is turned on, second light is emitted from the second light source 12. The second light is incident on the incident surface of the total internal reflection prism 20. The second light incident on the total internal reflection prism 20 is reflected by the second image former 32 to form second image light A2.

[0211] The first image light A1 and the second image light A2 can pass through the beam reducer prism 40 and be emitted to the projection lens 80. Specifically, the first image light A1 is refracted when passing through the first fixed prism 51 and is incident on the first movable prism 61. The second image light A2 is refracted when passing through the second fixed prism 52 and is incident on the second movable prism 62.

[0212] At this time, when the movable prism 60 is spaced apart from the fixed prism 50 by a certain distance, the first image light A1 and the second image light A2 can overlap each other by a certain width in the movable prism 60. In other words, the light rays located within a certain distance from the outermost light ray of the first image light A1 and the light rays located within a certain distance from the outermost light ray of the second image light A2 can overlap each other.

[0213] The projection lens 80 can magnify the first image light A1 and the second image light A2 that overlap by a certain width in the movable prism 60 passing through the beam reducer prism 40 and project them onto the screen. The image obtained by projecting the first image light A1 and the second image light A2 that overlap by a certain width in this way onto the screen by the projection lens 80 can form a wide image 203. The wide image 203 can be regarded as an image in which two images 201 and 202 of the double image overlap by a first width R1.

[0214] At this time, the aspect ratio of the wide image 203 is L2:H. Figure 10a The aspect ratio of the wide image 203 can be different from Figure 9a the aspect ratio of the wide image 203.

[0215] Figure 11a is a view showing a wide image projected by the electronic device 1 according to one or more embodiments of the present disclosure. Figure 11b is a view showing the projection according to one or more embodiments of the present disclosure Figure 11a of the relationship between the fixed prism 50 and the movable prism 60 of the electronic device 1 of the wide image.

[0216] Reference Figure 11a, an image (i.e., wide image 203) can be projected on the screen by the electronic device 1. The wide image 203 can be larger than each of the single image 201 and the first image 202 and the second image 203 of the dual image. In other words, the wide image 203 has a horizontal length L3 and a vertical length H. The vertical length H of the wide image 203 can be the same as the vertical length H of each of the single image and the dual image.

[0217] Figure 11a The wide image 203 shown can have a size smaller than Figure 10a the wide image 203 shown. In other words, Figure 11a the horizontal length L3 of the wide image 203 can be less than Figure 10a the horizontal length L2 of the wide image 203 and Figure 9a the horizontal length L1 of the wide image 203 (L3 < L2 < L1 = 2L). In this case, the wide image 203 can be in a state where the two images 201 and 202 of the dual image overlap the second width R2. By using an image blending method or an image stitching method, the overlapping part can be naturally realized as one image.

[0218] In this case, the movable prism 60 can be spaced apart from the fixed prism 50 by a predetermined distance.

[0219] Referring to Figure 11b , the distance between the fixed prism 50 and the movable prism 60 of the beam expander prism 40 of the electronic device 1 is D5. D5 can be greater than the minimum distance D2 between the fixed prism 50 and the movable prism 60, and less than the maximum distance D1 between them. In addition, D5 can be greater than the distance D4 between the fixed prism 50 and the movable prism 60 that forms Figure 10a the wide image 203 shown (D5 > D4 > D3).

[0220] When forming Figure 11a the wide image 203 on the screen, the user can touch the wide button 1213 displayed on the display part 121. In addition, the user can adjust the aspect ratio of the wide image 203 by touching the wide image adjustment button 1214.

[0221] When the wide button 1213 is touched, both the first light source 11 and the second light source 12 can be turned on.

[0222] When the first light source 11 is turned on, the first light is emitted from the first light source 11. The first light is incident on the incident surface of the total internal reflection prism 20. The first light incident on the total internal reflection prism 20 is reflected by the first image former 31 to form the first image light A1.

[0223] When the second light source 12 is turned on, second light is emitted from the second light source 12. The second light is incident on the incident surface of the total internal reflection prism 20. The second light incident on the total internal reflection prism 20 is reflected by the second image former 32 to form second image light A2.

[0224] The first image light A1 and the second image light A2 can pass through the beam reducer prism 40 and be emitted to the projection lens 80. Specifically, the first image light A1 is refracted when passing through the first fixed prism 51 and is incident on the first moving prism 61. The second image light A2 is refracted when passing through the second fixed prism 52 and is incident on the second moving prism 62.

[0225] At this time, when the moving prism 60 is spaced apart from the fixed prism 50 by a certain distance D5, the first image light A1 and the second image light A2 can overlap with each other by a certain width in the moving prism 60. In other words, the light rays located within a certain distance from the outermost light ray of the first image light A1 and the light rays located within a certain distance from the outermost light ray of the second image light A2 can overlap with each other. At this time, the Figure 11a overlap width of the first image light A1 and the second image light A2 forming the wide image 203 can be greater than the overlap width of the first image light A1 and the second image light A2 when forming the Figure 10a wide image 203.

[0226] The projection lens 80 can magnify the first image light A1 and the second image light A2 that overlap with each other by a certain width in the moving prism 60 passing through the beam reducer prism 40 and project them onto the screen. The image obtained by projecting the first image light A1 and the second image light A2 that overlap with each other by a certain width in this way onto the screen by the projection lens 80 can form the wide image 203. The wide image 203 can be regarded as an image in which two images 201 and 202 of the double image overlap by the second width R2.

[0227] At this time, the aspect ratio of the wide image 203 is L3:H. Figure 11a The aspect ratio of the wide image 203 of Figure 10a can be different from the aspect ratio of the wide image 203 of Figure 9a and the aspect ratio of the wide image 203 of

[0228] When the distance between the fixed prism 50 and the moving prism 60 is D3, D4 or D5, the wide image 203 is formed on the screen. Therefore, the position of the moving prism 60 at this time can be referred to as the third position.

[0229] As described above, the electronic device 1 according to one or more embodiments of the present disclosure can project a single image, a double image, and a wide image on the screen using the beam reducer prism 40 having a single device.

[0230] In addition, in the electronic device 1 according to one or more embodiments of the present disclosure, when projecting a wide image, the anamorphic prism 40 can be used to freely adjust the aspect ratio of the wide image.

[0231] Above, the present disclosure has been shown and described with reference to various embodiments. However, those skilled in the art should understand that various changes in form and detail can be made without departing from the scope of the present disclosure defined by the appended claims and their equivalents.

Claims

1. An electronic device, comprising: A first light source configured to emit a first light; A second light source arranged parallel to the first light source and configured to emit a second light; A total internal reflection prism disposed in front of the first light source and the second light source and configured to refract the first light and the second light; A first image former disposed adjacent to a first surface of the total internal reflection prism and configured to form the first light refracted by the total internal reflection prism into first image light and reflect the first image light to the total internal reflection prism such that the total internal reflection prism emits the first image light; A second image former disposed adjacent to the first surface of the total internal reflection prism and parallel to the first image former and configured to form the second light refracted by the total internal reflection prism into second image light and reflect the second image light to the total internal reflection prism such that the total internal reflection prism emits the second image light; A beam reducer prism configured to adjust a distance between the first image light and the second image light emitted from the total internal reflection prism; And A projection lens configured to project the first image light and the second image light with the adjusted distance onto a screen.

2. The electronic device according to claim 1, Wherein the beam reducer prism is configured to adjust the distance between the first image light and the second image light such that the first image light and the second image light with the adjusted distance form one of a single image, a wide image, and a double image on the screen.

3. The electronic device according to claim 1, Wherein the beam reducer prism comprises: A fixed prism adjacent to an exit surface of the total internal reflection prism, A movable prism spaced apart from the fixed prism, and A moving device configured to linearly move the movable prism relative to the fixed prism.

4. The electronic device according to claim 3, Wherein the movable prism can be positioned at a first position, a second position, and a third position. At the first position, the first image light and the second image light with the adjusted distance form a single image on the screen. At the second position, the first image light and the second image light with the adjusted distance form a double image on the screen. At the third position, the first image light and the second image light with the adjusted distance form a wide image on the screen.

5. The electronic device according to claim 4, Wherein the third position is located between the first position and the second position.

6. The electronic device according to claim 3, wherein The fixed prism comprises: A first fixed prism, and A second fixed prism spaced apart from the first fixed prism, Each of the first fixed prism and the second fixed prism is a right triangular prism, and The first fixed prism and the second fixed prism are arranged in an isosceles triangle shape with their bases parallel to the exit surface of the total internal reflection prism.

7. The electronic device according to claim 6, wherein The movable prism comprises: A first movable prism, and A second movable prism in contact with the first movable prism, The inclined surface of the first movable prism faces and is parallel to the inclined surface of the first fixed prism, and the inclined surface of the second movable prism faces and is parallel to the inclined surface of the second fixed prism.

8. The electronic device according to claim 6, wherein the fixed prism and the movable prism have the same refractive index.

9. The electronic device according to claim 3, wherein the fixed prism is a triangular prism having an isosceles triangular cross-section.

10. The electronic device according to claim 3, wherein the movable device includes: a movable plate on which the movable prism is disposed, and a linear motion mechanism configured to linearly move the movable plate.

11. The electronic device according to claim 1, wherein each of the first image former and the second image former includes a digital micromirror device.

12. The electronic device according to claim 1, wherein the first image former and the second image former are disposed on the same plane.

13. The electronic device according to claim 1, wherein the projection lens includes a wide-angle projection lens or an ultra-wide-angle projection lens.

14. The electronic device according to claim 1, further comprising: a housing; wherein the first light source, the second light source, the total internal reflection prism, the beam reducer prism, and the projection lens are disposed inside the housing.

15. The electronic device according to claim 14, wherein the housing includes a display portion configured to display buttons for adjusting the beam reducer prism.

Images