Display device

Abstract

A display apparatus is disclosed. The display apparatus includes a display unit including a plurality of display panels displaying images of different colors, a lens unit on the display unit, a light path controller on the lens unit, wherein the light path controller generates a composite image by superimposing the images displayed by the plurality of display panels on each other, and an output unit through which the composite image is displayed. The light path controller controls a light path of light incident on a first side of the light path controller facing the lens unit and a light path of light incident on a second side of the light path controller opposite the first side, and provides the composite image to the output unit.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a display device. BACKGROUND

[0002] A display device can be implemented as a head-mounted display ("HMD"), such as an augmented reality ("AR") display device and a virtual reality ("VR") display device. Such a display device can have a side gate effect phenomenon due to a black matrix between pixels. Also, in such a display device, due to limitations of a display panel manufacturing process, a process area, and performance of an optical system, it can not be possible to effectively display a high-resolution image. SUMMARY

[0003] Embodiments of the disclosure provide a display device capable of improving visual immersion of a user by displaying a high-resolution composite image using an output unit having a relatively small size.

[0004] According to embodiments of the disclosure, a display device includes a display unit including a plurality of display panels displaying images of different colors, a lens unit on the display unit, an optical path controller on the lens unit, wherein the optical path controller generates a composite image by superimposing the images displayed by the plurality of display panels on each other, and an output unit through which the composite image is displayed. In such embodiments, the optical path controller controls an optical path of light incident on a first side of the optical path controller facing the lens unit and an optical path of light incident on a second side of the optical path controller opposite the first side, and provides the composite image to the output unit.

[0005] In embodiments, the display unit can include a first display panel displaying a first image of a first color, a second display panel at a side of the first display panel, wherein the second display panel can display a second image of a second color different from the first color, and a third display panel at a side of the second display panel, wherein the third display panel can display a third image of a third color different from the first color and the second color.

[0006] In embodiments, the optical path controller can include a base transmitting light of the first image to the third image, a first diffraction module on a second surface of the base, wherein the first diffraction module can reflect the light of the first image, a second diffraction module on a first surface of the base opposite the second surface, wherein the second diffraction module can reflect the light of each of the first image and the third image toward the output unit and transmit the light of the second image toward the output unit, and a third diffraction module on the second surface of the base, wherein the third diffraction module can reflect the light of the third image toward the second diffraction module.

[0007] In an embodiment, each of the first to third diffraction modules can include a diffraction grating having a predetermined pitch, and the pitches of the diffraction gratings of the first to third diffraction modules can be different from each other.

[0008] In an embodiment, the first diffraction module can include a diffraction grating arranged at a first pitch, and reflect light of the first image toward a second diffraction module, the second diffraction module can include a diffraction grating arranged at a second pitch different from the first pitch, reflect light of each of the first and third images toward the output unit and transmit light of the second image toward the output unit, and the third diffraction module can include a diffraction grating arranged at a third pitch different from the first and second pitches, and reflect light of the third image toward the second diffraction module.

[0009] In an embodiment, the light path controller can include a base that transmits light of the first to third images, a first diffraction module on a first surface of the base, wherein the first diffraction module can change a light path of the light of the first image, a second diffraction module on a second surface of the base opposite the first surface, wherein the second diffraction module can change the light path of the light of each of the first and third images to be toward the output unit and transmit the light of the second image toward the output unit, and a third diffraction module on the first surface of the base, wherein the third diffraction module can change the light path of the light of the third image to be toward the second diffraction module.

[0010] In an embodiment, the light path controller can include a base that transmits light of the first to third images, a first diffraction module on a second surface of the base, wherein the first diffraction module can transmit the light of the first image toward the output unit and can change a light path of the light of each of the second and third images to be toward the output unit, a second diffraction module on a first surface of the base opposite the second surface, wherein the second diffraction module can change the light path of the light of the second image to be toward the first diffraction module, and a third diffraction module on the first surface of the base, wherein the third diffraction module can change the light path of the light of the third image to be toward the first diffraction module.

[0011] In an embodiment, the light path controller includes a first base on the lens unit, a first diffraction module on a first surface of the first base to correspond to the first display panel, a second diffraction module on a second surface of the first base to correspond to the second display panel, a second base on the first base, a third diffraction module on a first surface of the second base to correspond to the third display panel, and a fourth diffraction module on a second surface of the second base to correspond to the output unit.

[0012] In an embodiment, the first diffractive module can change an optical path of the light of the first image toward the second diffractive module, the second diffractive module can change the optical path of the light of the first image toward the fourth diffractive module, and can transmit the light of the second image toward the fourth diffractive module, the third diffractive module can change the optical path of the light of the third image toward the fourth diffractive module, and the fourth diffractive module can transmit the light of the first image and the light of the second image toward the output unit, and can change the optical path of the light of the third image toward the output unit.

[0013] In an embodiment, the optical path controller can include a first base on the lens unit, a first diffractive module on a second surface of the first base to correspond to the first display panel, a second diffractive module on a first surface of the first base to correspond to the second display panel, a second base on the first base, a third diffractive module on a first surface of the second base to correspond to the third display panel, and a fourth diffractive module on a second surface of the second base to correspond to the output unit.

[0014] In an embodiment, the first diffractive module can reflect the light of the first image toward the second diffractive module, the second diffractive module can reflect the light of the first image toward the fourth diffractive module, and can transmit the light of the second image toward the fourth diffractive module, the third diffractive module can change the optical path of the light of the third image toward the fourth diffractive module, and the fourth diffractive module can transmit the light of the first image and the light of the second image toward the output unit, and can change the optical path of the light of the third image toward the output unit.

[0015] In an embodiment, the optical path controller can include a base to transmit the light of the first image to the third image, a first diffractive module on a first surface of the base, wherein the first diffractive module can change the optical path of the light of the first image, a second diffractive module on a second surface of the base opposite to the first surface, wherein the second diffractive module can change the optical path of the light of each of the first image and the third image, and transmit the light of the second image, and a third diffractive module on the first surface of the base, wherein the third diffractive module can change the optical path of the light of the third image toward the second diffractive module. In such an embodiment, the second diffractive module can focus the light of the first image to the third image to a specific point in front of the output unit.

[0016] In an embodiment, the display unit can include a first display panel to display a first image of a first color, a second display panel spaced apart from the first display panel by a predetermined distance, wherein the second display panel can display a second image of a second color different from the first color, and a third display panel spaced apart from the second display panel by a predetermined distance, wherein the third display panel can display a third image of a third color different from the first color and the second color.

[0017] In an embodiment, the light path controller can include a base transmitting light of the first image to the third image, a first diffraction module on a first surface of the base, wherein the first diffraction module can change a light path of the light of the first image, a second diffraction module on a second surface of the base opposite to the first surface, wherein the second diffraction module can change the light path of the light of each of the first image and the third image to be toward the output unit and transmit the light of the second image toward the output unit, and a third diffraction module on the first surface of the base, wherein the third diffraction module can change the light path of the light of the third image to be toward the second diffraction module.

[0018] In an embodiment, the light path controller can include a base transmitting or internally totally reflecting light of the first image to the third image, a first diffraction module on a first surface of the base, wherein the first diffraction module can change a light path of the light of the first image, a second diffraction module on a second surface of the base opposite to the first surface, wherein the second diffraction module can change the light path of the light of each of the first image and the third image to be toward the output unit and transmit the light of the second image toward the output unit, and a third diffraction module on the first surface of the base, wherein the third diffraction module can change the light path of the light of the third image. In such an embodiment, the light of the first image passing through the first diffraction module and the light of the third image passing through the third diffraction module can be totally reflected within the base and guided to the second diffraction module.

[0019] In an embodiment, the light path controller can include a base transmitting or internally totally reflecting light of the first image to the third image, a first diffraction module on a first surface of the base, wherein the first diffraction module can change a light path of the light of the first image, a second diffraction module on a second surface of the base opposite to the first surface, wherein the second diffraction module can change the light path of the light of each of the first image and the third image to be toward the output unit and transmit the light of the second image toward the output unit, and a third diffraction module on the first surface of the base, wherein the third diffraction module can change the light path of the light of the third image. In such an embodiment, the light of the first image passing through the first diffraction module and the light of the third image passing through the third diffraction module can be totally reflected within the base and guided to the second diffraction module.

[0020] In an embodiment, the display unit can include a first display panel on a first plane, wherein the first display panel can display a first image of a first color, a second display panel on a second plane intersecting the first plane, wherein the second display panel can display a second image of a second color different from the first color, and a third display panel on a third plane intersecting the first plane and the second plane, wherein the third display panel can display a third image of a third color different from the first color and the second color.

[0021] In an embodiment, the light path controller can include a base that transmits light of the first image to the third image. In such an embodiment, the base can include a first surface parallel to the first plane, a second surface parallel to the second plane, a third surface parallel to the third plane, and a fourth surface facing the output unit.

[0022] In an embodiment, light of the first image can pass through the first surface to the fourth surface, light of the second image can pass through the second surface to the fourth surface, and light of the third image can pass through the third surface to the fourth surface.

[0023] In an embodiment, the base can further include a first diffraction module on the fourth surface of the base, wherein the diffraction module can focus light of the first image to the third image to a specific point in front of the output unit.

[0024] According to an embodiment of the display apparatus of the present disclosure, the resolution of the composite image can be improved by including a light path controller for generating the composite image by superimposing the respective images of the plurality of display panels on each other. In such an embodiment, the thickness of the display apparatus can be reduced by combining the plurality of images via the light path controller rather than directly stacking the plurality of display panels in the thickness direction thereof. In such an embodiment, even when the display apparatus includes an output unit having a relatively small size, the visual immersion of the user can be improved by displaying a high-resolution composite image. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other features of the present disclosure will become more apparent by describing in detail embodiments thereof with reference to the attached drawings, in which:

[0026] Figure 1 is a perspective view illustrating a display apparatus according to an embodiment;

[0027] Figure 2 illustrates an internal structure of a display apparatus according to an embodiment;

[0028] Figure 3 illustrates a composite image in which a plurality of images in a display apparatus are superimposed according to an embodiment;

[0029] Figure 4 illustrates a process of generating a composite image in a display apparatus according to an embodiment;

[0030] Figure 5 illustrates a process of generating a composite image in a display apparatus according to an alternative embodiment;

[0031] Figure 6A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0032] Figure 7 A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0033] Figure 8 A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0034] Figure 9 A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0035] Figure 10 A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0036] Figure 11 A process of generating a composite image in a display device according to another alternative embodiment is shown;

[0037] Figure 12 A process of generating a composite image in a display device according to another alternative embodiment is shown; and

[0038] Figure 13 A process of generating a composite image in a display device according to another alternative embodiment is shown. DETAILED DESCRIPTION

[0039] The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which various embodiments of the application are shown. The application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like elements throughout.

[0040] It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can be present therebetween. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.

[0041] It will be understood that, although the terms“first,”“second,”“third,” etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus,“a first element,”“a first component,”“a first region,”“a first layer,” or“a first portion” discussed below could be termed a second element, a second component, a second region, a second layer, or a second portion without departing from the teachings herein.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the terms“a,”“an,” and“the” are not intended to refer to a quantity of one, but rather to be consistent with the definition of“at least one.” For example, an“element” has the same meaning as“at least one element,” unless the context clearly indicates otherwise. “At least one” should not be construed as limiting“a” or“an.” “Or” means“and / or.” As used herein, the term“and / or” includes any and all combinations of one or more of the associated listed items. It will be understood that the terms“comprise” and / or“comprising,” or“include” and / or“including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0043] In addition, relative terms such as“lower” or“bottom” and“upper” or“top” can be used herein to describe one element’s or portion’s relationship to another element’s or portion’s orientation as the illustrations can be oriented upside down or overturned in the drawings. It will be understood that the terms so used are intended to encompass different orientations of the device in its operation or use, in addition to its orientation in the drawings. For example, if a device is oriented in the drawings as turned over or upside down, the description of a part as being on the“lower” side or the“bottom” side of another part can be interpreted as being on the upper side or the top side of another part, and vice versa. Similarly, the term“below” or“under” can include both orientations of below or under. The terms“above” or“over” can include both orientations of above or over. The terms“first,”“second,”“third,” etc. are used herein to describe various elements, components, regions, layers and / or sections but are not intended to limit such elements, components, regions, layers and / or sections. Such terms are used only to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a“first element,”“a first component,”“a first region,”“a first layer,” or“a first portion” discussed below can be termed a second element, a second component, a second region, a second layer, or a second portion without departing from the teachings herein.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0045] Embodiments are described herein with reference to cross-sectional illustrations as idealized representations of schematic illustrations of embodiments. As such, deviations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Therefore, embodiments described herein are not to be construed as being limited to the particular shapes as illustrated herein but are to include deviations in shapes that result from, for example, manufacturing. For example, regions illustrated or described as flat can often have rough and / or nonlinear features. Moreover, corners illustrated as sharp can be rounded. Thus, the regions illustrated in the figures are schematic and their shapes are not intended to be limiting of the scope of the claims.

[0046] Embodiments of the present application will be described in detail below with reference to the attached drawings.

[0047] Figure 1 is a perspective view illustrating a display apparatus according to an embodiment. Figure 2 An inside of a display apparatus according to an embodiment is illustrated. Figure 3 A composite image in which a plurality of images in a display apparatus are superimposed on each other according to an embodiment is illustrated.

[0048] Referring to Figures 1 to 3 Embodiments of the display apparatus 10 can provide a virtual image to a user. In one embodiment, for example, the display apparatus 10 can be implemented as a head-mounted display ("HMD") such as an augmented reality ("AR") display apparatus and a virtual reality ("VR") display apparatus, and can improve visual immersion of a user.

[0049] In embodiments, as Figure 2 Embodiments of the display apparatus 10 can include a display unit 100, a lens unit 200, an optical path controller 300, and a housing 500, as illustrated in

[0050] The display unit 100 can include a light emitting display panel having light emitting elements. In an embodiment, for example, the display unit 100 can be an organic light emitting display panel using an organic light emitting diode including an organic light emitting layer, a micro light emitting display panel using a micro light emitting diode ("LED"), a quantum dot light emitting display panel using a quantum dot light emitting diode including a quantum dot light emitting layer, or an inorganic light emitting display panel using an inorganic light emitting element including an inorganic semiconductor.

[0051] The display unit 100 can include a plurality of display panels for displaying images of different colors. Each of the plurality of display panels can include a plurality of pixels and can display an image corresponding to the respective display panel. In an embodiment, as shown in FIG. 1, the display unit 100 can include a first display panel 110, a second display panel 120, and a third display panel 130. Figure 2

[0052] The first display panel 110 can include a plurality of pixels that emit light of a first color. The pixels of the first display panel 110 emit light of the first color to display a first image IMG1 of the first color.

[0053] The second display panel 120 can be disposed on a side of the first display panel 110. The second display panel 120 can include a plurality of pixels that emit light of a second color. The second display panel 120 can emit light of the second color, which is different from the first color of the first display panel 110, to display a second image IMG2 of the second color.

[0054] The third display panel 130 can be disposed at a side of the second display panel 120. The third display panel 130 can include a plurality of pixels that emit light of a third color. The third display panel 130 can emit light of the third color, which is different from the first color of the first display panel 110 and the second color of the second display panel 120, to display a third image IMG3 of the third color.

[0055] In an embodiment, for example, the first color is one of red, green, and blue, the second color is another one of red, green, and blue, and the third color is the remaining one of red, green, and blue. However, the present disclosure is not limited thereto.

[0056] ​The lens unit 200 can be disposed on one surface of the display unit 100. The lens unit 200 can focus light of an image of the display unit 100 and provide the focused light to the light path controller 300. In one embodiment, for example, the lens unit 200 can be attached to one surface of the display unit 100 by an adhesive member. In one alternative embodiment, for example, the lens unit 200 can be disposed on one surface of the display unit 100 while being spaced apart from the display unit 100 by a predetermined distance. Here, the distance between the lens unit 200 and the display unit 100 can be determined by various conditions of the display unit 100, the lens unit 200, and the light path controller 300.

[0057] In one embodiment, for example, in the lens unit 200, the plurality of lenses 220 can be implemented as a lenticular lens sheet. In one alternative embodiment, for example, the lens unit 200 can be implemented as a liquid crystal lens that forms a lens by controlling liquid crystals of a liquid crystal layer. In the embodiment in which the lens unit 200 is implemented as a lenticular lens sheet, the lens unit 200 can include the lens base 210 and the plurality of lenses 220.

[0058] The lens base 210 can be disposed on one surface of the display unit 100. In one embodiment, for example, one surface of the lens base 210 that faces the display unit 100 and an opposite surface of the lens base 210 that is opposite to the one surface of the lens base 210 can be parallel to each other. The lens base 210 can directly transmit light incident from the display unit 100. The direction of light passing through one surface of the lens base 210 can be the same as the direction of light passing through the opposite surface of the lens base 210. The lens base 210 can be integrally formed with the plurality of lenses 220 as a single integral unit, but the present disclosure is not limited thereto.

[0059] The plurality of lenses 220 can be disposed on the lens base 210 and can change the direction of light incident from the display unit 100. Light incident from the display unit 100 can pass through the lens base 210 and reach the plurality of lenses 220.

[0060] The plurality of lenses 220 can be integrally formed with the lens base 210 as a single integral unit. In one embodiment, for example, the plurality of lenses 220 can be imprinted on the opposite surface of the lens base 210. The plurality of lenses 220 can be semi-cylindrical lenses, but are not limited thereto. In one alternative embodiment, for example, the plurality of lenses 220 can be implemented as a Fresnel lens. In another alternative embodiment, for example, the plurality of lenses 220 can be manufactured separately from the lens base 210 and then attached to the lens base 210.

[0061] The light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing images of the plurality of display panels on each other. The light path controller 300 can generate a single composite image CI by superimposing the first image IMG1 of the first display panel 110, the second image IMG2 of the second display panel 120, and the third image IMG3 of the third display panel 130 on each other.

[0062] The light path controller 300 can diffract light of an image incident through the display unit 100 and the lens unit 200. In an embodiment, for example, the light path controller 300 can transmit or reflect light having a specific wavelength. A light path of light passing through the light path controller 300 can be maintained or can be changed by a predetermined angle. In an embodiment, the light path controller 300 can internally totally reflect light incident at a predetermined angle. Accordingly, the light path controller 300 can control light paths of images of the plurality of display panels disposed at different positions to generate a composite image CI by superimposing the plurality of images on each other.

[0063] In an embodiment, for example, the first display panel 110 to the third display panel 130 can be sequentially disposed while facing the light path controller 300. In such an embodiment, the first display panel 110 can be disposed at an upper portion of the display unit 100, the second display panel 120 can be disposed at a middle portion of the display unit 100, and the third display panel 130 can be disposed at a lower portion of the display unit 100. In such an embodiment, the first image IMG1 of the first display panel 110 can be incident on an upper portion of one surface of the light path controller 300, the second image IMG2 of the second display panel 120 can be incident on a middle portion of one surface of the light path controller 300, and the third image IMG3 of the third display panel 130 can be incident on a lower portion of one surface of the light path controller 300. The light path controller 300 can control light paths of light incident on a first side of the light path controller 300 facing the lens unit 200 and light paths of light incident on a second side of the light path controller 300 opposite the first side, and can provide the composite image CI to the output unit 510. The light path controller 300 can control light paths of the first image IMG1 to the third image IMG3 incident on different positions to provide the composite image CI to the output unit 510.

[0064] In an embodiment, as Figure 2 and Figure 3As illustrated in FIG. 1, the display device 10 can generate a composite image CI by combining the first image IMG1 to the third image IMG3. When the display device 10 includes the first display panel 110 to the third display panel 130, one pixel of the composite image CI can be formed by combining one pixel of the first display panel 110, one pixel of the second display panel 120, and one pixel of the third display panel 130. In one embodiment, for example, the composite image CI can display a color that can be displayed by a unit pixel including a first sub-pixel, a second sub-pixel, and a third sub-pixel, using one sub-pixel, where the first sub-pixel displays a first color, the second sub-pixel displays a second color, and the third sub-pixel displays a third color. Accordingly, the display device 10 can display the composite image CI having a resolution that is the same as a resolution of the first display panel 110 to the third display panel 130. By combining the first image IMG1 to the third image IMG3 via the light path controller 300 instead of directly stacking the first display panel 110 to the third display panel 130 in a thickness direction thereof, a thickness of the display device 10 can be reduced. Even when the display device 10 includes the output unit 510 having a relatively small size, a user's visual immersion can be improved by displaying the composite image CI having a high resolution.

[0065] The housing 500 can form an appearance of the display device 10, and can accommodate the display unit 100, the lens unit 200, and the light path controller 300 therein. The housing 500 can surround components of the display device 10 except for the output unit 510.

[0066] The output unit 510 can be disposed or defined to overlap one surface of the light path controller 300 to display the composite image CI. The user's eye EYE can view the composite image CI through the output unit 510. In one embodiment, for example, the output unit 510 can include an optical lens that adjusts a focal point of the composite image CI. In one alternative embodiment, for example, the light path controller 300 can control the focal point of the composite image CI. In such an embodiment, the output unit 510 can not include a separate optical lens.

[0067] Figure 4 A process of generating a composite image in a display device according to an embodiment is illustrated.

[0068] Referring to Figure 4 Embodiments of the display device 10 can include the display unit 100, the lens unit 200, and the light path controller 300.

[0069] The display unit 100 can include a plurality of display panels for displaying images of different colors. Each of the plurality of display panels can include a plurality of pixels and can display an image of a predetermined color. The display unit 100 can include a first display panel 110, a second display panel 120, and a third display panel 130.

[0070] The first display panel 110 can include a plurality of pixels that emit light of a first color. The pixels of the first display panel 110 can emit light of the first color to display a first image IMG1 of the first color.

[0071] The second display panel 120 can be disposed at a side of the first display panel 110. The second display panel 120 can include a plurality of pixels that emit light of a second color. The second display panel 120 can emit light of the second color, which is different from the first color of the first display panel 110, to display a second image IMG2 of the second color.

[0072] The third display panel 130 can be disposed at a side of the second display panel 120. The third display panel 130 can include a plurality of pixels that emit light of a third color. The third display panel 130 can emit light of the third color, which is different from the first color of the first display panel 110 and the second color of the second display panel 120, to display a third image IMG3 of the third color.

[0073] In one embodiment, for example, the first color is one of red, green, and blue, the second color is another one of red, green, and blue, and the third color is the remaining one of red, green, and blue. However, the present disclosure is not limited thereto.

[0074] The lens unit 200 can be disposed on one surface of the display unit 100. The lens unit 200 can focus light of images of the display unit 100 and provide the focused light to the light path controller 300.

[0075] The light path controller 300 can be disposed to face the lens unit 200 and can generate a composite image CI by superimposing the images of the first display panel 110 to the third display panel 130 on each other. The light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0076] The base 301 can transmit light incident thereon from the display unit 100. One surface (or first surface) 301a of the base 301 facing the lens unit 200 and the opposite surface 301b of the base 301 facing the output unit 510 can be parallel to each other. The direction of light passing through one surface 301a of the base 301 can be the same as the direction of light incident on the opposite surface (or second surface) 301b of the base 301 passing through the base 301. The base 301 can support the first to third diffraction modules 310 to 330.

[0077] The first diffraction module 310 can be disposed on the opposite surface 301b of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can reflect light of the first image IMG1 of the first display panel 110 toward the second diffraction module 320. The first diffraction module 310 can include diffraction gratings arranged at a first pitch. In one embodiment, for example, the diffraction gratings of the first diffraction module 310 are arranged at a first pitch corresponding to the wavelength of light of the first image IMG1 so that the light of the first image IMG1 is reflected by the first diffraction module 310 toward the second diffraction module 320.

[0078] In one optional embodiment, for example, the first diffraction module 310 can include diffraction gratings arranged at a first pitch and having a first depth (or groove depth). The diffraction gratings of the first diffraction module 310 have the first depth and are arranged at the first pitch corresponding to the wavelength of light of the first image IMG1 so that the light of the first image IMG1 is reflected by the first diffraction module 310 toward the second diffraction module 320.

[0079] The refractive index of the first diffraction module 310 can be substantially the same as the refractive index of the base 301.

[0080] The second diffraction module 320 can be disposed on one surface 301a of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the output unit 510. The second diffraction module 320 can include diffraction gratings arranged at a second pitch. In such an embodiment, the second pitch of the second diffraction module 320 can be different from the first pitch of the first diffraction module 310. The diffraction gratings of the second diffraction module 320 are arranged at the second pitch not affecting the wavelength of light of the second image IMG2 so that the second image IMG2 can pass through the second diffraction module 320 and proceed to the output unit 510.

[0081] The second diffraction module 320 can reflect light incident from the first diffraction module 310 toward the output unit 510. The second diffraction module 320 can reflect light incident from the third diffraction module 330 toward the output unit 510.

[0082] In one optional embodiment, for example, the second diffraction module 320 can include diffraction gratings arranged at a second pitch and having a second depth. In such an embodiment, the second depth of the second diffraction module 320 can be different from the first depth of the first diffraction module 310. The diffraction gratings of the second diffraction module 320 have the second depth and are arranged at the second pitch that does not affect the light wavelength of the second image IMG2, such that the light of the second image IMG2 is transmitted through the second diffraction module 320 toward the output unit 510, and the light of the first image IMG1 and the light of the third image IMG3 are reflected by the second diffraction module 320 toward the output unit 510.

[0083] The refractive index of the second diffraction module 320 can be substantially the same as the refractive index of the base 301.

[0084] The third diffraction module 330 can be disposed on the opposite surface 301b of the base 301 to correspond to the third display panel 130. The third diffraction module 330 can reflect the light of the third image IMG3 of the third display panel 130 toward the second diffraction module 320. The third diffraction module 330 can include diffraction gratings arranged at a third pitch. In such an embodiment, the third pitch of the third diffraction module 330 can be different from the first pitch of the first diffraction module 310 and the second pitch of the second diffraction module 320. In one embodiment, for example, the diffraction gratings of the third diffraction module 330 are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the light of the third image IMG3 is reflected by the third diffraction module 330 toward the second diffraction module 320.

[0085] In one optional embodiment, for example, the third diffraction module 330 can include diffraction gratings arranged at a third pitch and having a third depth. In such an embodiment, the third depth of the third diffraction module 330 can be different from the first depth of the first diffraction module 310 and the second depth of the second diffraction module 320. The diffraction gratings of the third diffraction module 330 have the third depth and are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the light of the third image IMG3 is reflected by the third diffraction module 330 toward the second diffraction module 320.

[0086] The refractive index of the third diffraction module 330 can be substantially the same as the refractive index of the base 301.

[0087] The output unit 510 can be disposed on the opposite surface 301b of the base 301 to correspond to the second diffraction module 320. The composite image CI can include light of the first image IMG1 and light of the third image IMG3 reflected by the second diffraction module 320, and light of the second image IMG2 passing through the second diffraction module 320. Accordingly, the display apparatus 10 can display the composite image CI having the same resolution as the resolutions of the first display panel 110 through the third display panel 130. By combining the first image IMG1 through the third image IMG3 via the light path controller 300 rather than directly stacking the first display panel 110 through the third display panel 130 in the thickness direction thereof, the thickness of the display apparatus 10 can be reduced. In such an embodiment, even when the display apparatus 10 includes the output unit 510 having a relatively small size, it is possible to improve the visual immersion of a user by displaying the composite image CI having a high resolution.

[0088] Figure 5 A process of generating a composite image in a display apparatus according to an alternative embodiment is illustrated. Except for the light path controller 300, Figure 5 The display apparatus of Figure 4 is substantially the same as the display apparatus of Figure 5 The same or similar elements shown in the above-described display apparatuses are labeled with the same reference numerals as those used in the above description of the above-described display apparatuses, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0089] Referring to Figure 5 In an embodiment, the light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first display panel 110 through the third display panel 130 on each other. The light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0090] The first diffraction module 310 can be disposed on one surface 301a of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can change the light path of the first image IMG1 of the first display panel 110 to be directed toward the second diffraction module 320. The first diffraction module 310 can include diffraction gratings disposed at a first pitch. In one embodiment, for example, the diffraction gratings of the first diffraction module 310 are disposed at a first pitch corresponding to the wavelength of light of the first image IMG1, such that the light path of the first image IMG1 is changed by the first diffraction module 310 to be directed toward the second diffraction module 320.

[0091] The second diffraction module 320 can be disposed on the opposite surface 301b of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the output unit 510. The second diffraction module 320 can include diffraction gratings arranged at a second pitch. In such an embodiment, the second pitch of the second diffraction module 320 can be different from the first pitch of the first diffraction module 310.

[0092] The second diffraction module 320 can change an optical path of light incident from the first diffraction module 310 to be toward the output unit 510. The second diffraction module 320 can change an optical path of light incident from the third diffraction module 330 to be toward the output unit 510.

[0093] In one alternative embodiment, for example, the second diffraction module 320 can include diffraction gratings arranged at a second pitch and having a second depth. In such an embodiment, the second depth of the second diffraction module 320 can be different from the first depth of the first diffraction module 310. The diffraction gratings of the second diffraction module 320 have the second depth and are arranged at the second pitch that does not affect a light wavelength of the second image IMG2, so that light of the second image IMG2 is transmitted toward the output unit 510 through the second diffraction module 320, and the second diffraction module 320 changes an optical path of light of the first image IMG1 and an optical path of light of the third image IMG3 to be toward the output unit 510.

[0094] The refractive index of the second diffraction module 320 can be substantially the same as the refractive index of the base 301.

[0095] The third diffraction module 330 can be disposed on one surface 301a of the base 301 to correspond to the third display panel 130. The third diffraction module 330 can change an optical path of a third image IMG3 of the third display panel 130 to be toward the second diffraction module 320. The third diffraction module 330 can include diffraction gratings arranged at a third pitch. In such an embodiment, the third pitch of the third diffraction module 330 can be different from the first pitch of the first diffraction module 310 and the second pitch of the second diffraction module 320. In one embodiment, for example, the diffraction gratings of the third diffraction module 330 are arranged at the third pitch corresponding to a light wavelength of the third image IMG3, so that the third diffraction module 330 changes an optical path of the third image IMG3 to be toward the second diffraction module 320.

[0096] In one alternative embodiment, for example, the third diffraction module 330 can include diffraction gratings arranged at a third pitch and having a third depth. In such an embodiment, the third depth of the third diffraction module 330 can be different from the first depth of the first diffraction module 310 and the second depth of the second diffraction module 320. The diffraction gratings of the third diffraction module 330 have the third depth and are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the third diffraction module 330 changes the optical path of the third image IMG3 toward the second diffraction module 320.

[0097] The refractive index of the third diffraction module 330 can be substantially the same as the refractive index of the base 301.

[0098] The output unit 510 can be disposed on the opposite surface 301b of the base 301 to correspond to the second diffraction module 320. The composite image CI can include the light of the first image IMG1 and the light of the third image IMG3, whose optical paths are changed by the second diffraction module 320, and the light of the second image IMG2 passing through the second diffraction module 320. Accordingly, the display apparatus 10 can display the composite image CI having the same resolution as the resolutions of the first display panel 110 through the third display panel 130. By combining the first image IMG1 through the third image IMG3 via the optical path controller 300 rather than directly stacking the first display panel 110 through the third display panel 130 in the thickness direction thereof, the thickness of the display apparatus 10 can be reduced.

[0099] Figure 6 A process of generating a composite image in a display apparatus according to another alternative embodiment is illustrated. Except for the optical path controller 300, Figure 6 the display apparatus of Figure 4 and Figure 5 is substantially the same as the display apparatus of Figure 6 The same or similar elements shown in the above-described display apparatuses are labeled with the same reference numerals as those used in the above description of the embodiments of the display apparatuses, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0100] Referring to Figure 6 , in an embodiment, the optical path controller 300 can be disposed to face the lens unit 200 and can generate a composite image CI by superimposing the images of the first display panel 110 through the third display panel 130 on each other. The optical path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0101] The first diffraction module 310 can be disposed on the opposite surface 301b of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can transmit light of the first image IMG1 of the first display panel 110 toward the output unit 510. The first diffraction module 310 can include diffraction gratings arranged at a first pitch. The diffraction gratings of the first diffraction module 310 are arranged at the first pitch not to affect a wavelength of light of the first image IMG1 so that the light of the first image IMG1 is transmitted toward the output unit 510 through the first diffraction module 310.

[0102] The first diffraction module 310 can change an optical path of light incident from the second diffraction module 320 to be toward the output unit 510. The first diffraction module 310 can change an optical path of light incident from the third diffraction module 330 to be toward the output unit 510. The diffraction gratings of the first diffraction module 310 can change an optical path of the second image IMG2 and an optical path of the third image IMG3 to be toward the output unit 510.

[0103] In one alternative embodiment, for example, the first diffraction module 310 can include diffraction gratings arranged at a first pitch and having a first depth. The diffraction gratings of the first diffraction module 310 have the first depth and are arranged at the first pitch not to affect a wavelength of light of the first image IMG1 so that the light of the first image IMG1 is transmitted toward the output unit 510 through the first diffraction module 310.

[0104] The second diffraction module 320 can be arranged on one surface 301a of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can change an optical path of the second image IMG2 of the second display panel 120 to be toward the first diffraction module 310. The second diffraction module 320 can include diffraction gratings arranged at a second pitch. Here, the second pitch of the second diffraction module 320 can be different from the first pitch of the first diffraction module 310. In one embodiment, for example, the diffraction gratings of the second diffraction module 320 are arranged at the second pitch corresponding to a wavelength of light of the second image IMG2 so that the second diffraction module 320 changes the optical path of the second image IMG2 to be toward the first diffraction module 310.

[0105] The second diffraction module 320 can include diffraction gratings arranged at a second pitch and having a second depth. In such an embodiment, the second depth of the second diffraction module 320 can be different from the first depth of the first diffraction module 310. The diffraction gratings of the second diffraction module 320 have the second depth and are arranged at the second pitch corresponding to a wavelength of light of the second image IMG2 so that the second diffraction module 320 changes the optical path of the second image IMG2 to be toward the first diffraction module 310.

[0106] The refractive index of the second diffraction module 320 can be substantially the same as the refractive index of the base 301.

[0107] The third diffraction module 330 can be disposed on one surface 301a of the base 301 to correspond to the third display panel 130. The third diffraction module 330 can change the optical path of the third image IMG3 of the third display panel 130 toward the first diffraction module 310. The third diffraction module 330 can include diffraction gratings arranged at a third pitch. In such an embodiment, the third pitch of the third diffraction module 330 can be different from the first pitch of the first diffraction module 310 and the second pitch of the second diffraction module 320. In one embodiment, for example, the diffraction gratings of the third diffraction module 330 are arranged at a third pitch corresponding to the light wavelength of the third image IMG3, such that the third diffraction module 330 changes the optical path of the third image IMG3 toward the first diffraction module 310.

[0108] The third diffraction module 330 can include diffraction gratings arranged at a third pitch and having a third depth. In such an embodiment, the third depth of the third diffraction module 330 can be different from the first depth of the first diffraction module 310 and the second depth of the second diffraction module 320. The diffraction gratings of the third diffraction module 330 have the third depth and are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the third diffraction module 330 changes the optical path of the third image IMG3 toward the first diffraction module 310.

[0109] The refractive index of the third diffraction module 330 can be substantially the same as the refractive index of the base 301.

[0110] The output unit 510 can be disposed on the opposite surface 301b of the base 301 to correspond to the first diffraction module 310. The composite image CI can include the light of the second image IMG2 and the light of the third image IMG3, whose optical paths are changed by the first diffraction module 310, and the light of the first image IMG1 passing through the first diffraction module 310. Accordingly, the display apparatus 10 can display the composite image CI having the same resolution as the resolutions of the first display panel 110 through the third display panel 130. By combining the first image IMG1 through the third image IMG3 via the optical path controller 300 rather than directly stacking the first display panel 110 through the third display panel 130 in the thickness direction thereof, the thickness of the display apparatus 10 can be reduced.

[0111] Figure 7 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. In addition to the display unit 100 and the optical path controller 300, Figure 7 The display apparatus of Figures 4 to 6 The display apparatus of Figure 7The same or similar elements as those shown in the above-described display device embodiments have been labeled with the same reference numerals as those used in the above description of the above-described display device embodiments, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0112] The display unit 100 can include a first display panel 110, a second display panel 120, and a third display panel 130.

[0113] The first display panel 110 can include a plurality of pixels that emit light of a first color. The pixels of the first display panel 110 can emit light of the first color to display a first image IMG1 of the first color.

[0114] The second display panel 120 can be disposed at a side of the first display panel 110. The second display panel 120 can include a plurality of pixels that emit light of a second color. The second display panel 120 can emit light of the second color, which is different from the first color of the first display panel 110, to display a second image IMG2 of the second color.

[0115] The third display panel 130 can be disposed at a side of the second display panel 120. The third display panel 130 can include a plurality of pixels that emit light of a third color. The third display panel 130 can emit light of the third color, which is different from the first color of the first display panel 110 and the second color of the second display panel 120, to display a third image IMG3 of the third color.

[0116] In such an embodiment, as shown in Figure 7 The first display panel 110 to the third display panel 130 can be spaced apart from each other, as shown in

[0117] The light path controller 300 can be disposed to face the lens unit 200 and can generate a composite image CI by superimposing the images of the first display panel 110 to the third display panel 130 on each other. The light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0118] The first diffraction module 310 can be disposed on one surface 301a of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can change an optical path of the first image IMG1 of the first display panel 110 toward the second diffraction module 320. The first diffraction module 310 can include diffraction gratings arranged at a first pitch. In one embodiment, for example, the diffraction gratings of the first diffraction module 310 are arranged at a first pitch corresponding to a light wavelength of the first image IMG1, such that the first diffraction module 310 changes the optical path of the first image IMG1 toward the second diffraction module 320.

[0119] In one optional embodiment, for example, the first diffraction module 310 can include diffraction gratings arranged at a first pitch and having a first depth. The diffraction gratings of the first diffraction module 310 have the first depth and are arranged at the first pitch corresponding to the light wavelength of the first image IMG1, such that the first diffraction module 310 changes the optical path of the first image IMG1 toward the second diffraction module 320.

[0120] The refractive index of the first diffraction module 310 can be substantially the same as the refractive index of the base 301.

[0121] The second diffraction module 320 can be disposed on an opposite surface 301b of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the output unit 510. The second diffraction module 320 can include diffraction gratings arranged at a second pitch. In such an embodiment, the second pitch of the second diffraction module 320 can be different from the first pitch of the first diffraction module 310. In one embodiment, for example, the diffraction gratings of the second diffraction module 320 are arranged at a second pitch that does not affect a light wavelength of the second image IMG2, such that the second image IMG2 can be transmitted through the second diffraction module 320 and proceed to the output unit 510.

[0122] The second diffraction module 320 can change an optical path of light incident from the first diffraction module 310 toward the output unit 510. The second diffraction module 320 can change an optical path of light incident from the third diffraction module 330 toward the output unit 510.

[0123] In one optional embodiment, for example, the second diffraction module 320 can include diffraction gratings arranged at a second pitch and having a second depth. In such an embodiment, the second depth of the second diffraction module 320 can be different from the first depth of the first diffraction module 310. The diffraction gratings of the second diffraction module 320 have the second depth and are arranged at the second pitch that does not affect the light wavelength of the second image IMG2, such that the second diffraction module 320 transmits the light of the second image IMG2 therethrough toward the output unit 510 and changes the light path of the first image IMG1 and the light path of the third image IMG3 toward the output unit 510.

[0124] The refractive index of the second diffraction module 320 can be substantially the same as the refractive index of the base 301.

[0125] The third diffraction module 330 can be disposed on one surface 301a of the base 301 to correspond to the third display panel 130. The third diffraction module 330 can change the light path of the third image IMG3 of the third display panel 130 toward the second diffraction module 320. The third diffraction module 330 can include diffraction gratings arranged at a third pitch. In such an embodiment, the third pitch of the third diffraction module 330 can be different from the first pitch of the first diffraction module 310 and the second pitch of the second diffraction module 320. In one embodiment, for example, the diffraction gratings of the third diffraction module 330 are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the third diffraction module 330 changes the light path of the third image IMG3 toward the second diffraction module 320.

[0126] In one optional embodiment, for example, the third diffraction module 330 can include diffraction gratings arranged at a third pitch and having a third depth. In such an embodiment, the third depth of the third diffraction module 330 can be different from the first depth of the first diffraction module 310 and the second depth of the second diffraction module 320. The diffraction gratings of the third diffraction module 330 have the third depth and are arranged at the third pitch corresponding to the light wavelength of the third image IMG3, such that the third diffraction module 330 changes the light path of the third image IMG3 toward the second diffraction module 320.

[0127] The refractive index of the third diffraction module 330 can be substantially the same as the refractive index of the base 301.

[0128] The output unit 510 can be disposed on the opposite surface 301b of the base 301 to correspond to the second diffraction module 320. The composite image CI can include the light of the first image IMG1 and the light of the third image IMG3, whose optical paths are changed by the second diffraction module 320, and the light of the second image IMG2 that passes through the second diffraction module 320. In such an embodiment, even when the first display panel 110, the second display panel 120, and the third display panel 130 are spaced apart by a predetermined distance, the display apparatus 10 can display the composite image CI having the same resolution as the resolutions of the first display panel 110 through the third display panel 130. By combining the first image IMG1 through the third image IMG3 via the light path controller 300 rather than directly stacking the first display panel 110 through the third display panel 130 in the thickness direction thereof, the thickness of the display apparatus 10 can be reduced.

[0129] Figure 8 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. In addition to the display unit 100 and the light path controller 300, Figure 8 The display apparatus of Figures 4 to 7 is substantially the same as the display apparatus of Figure 8 The same or similar elements shown in will be labeled with the same reference numerals as the above figures used to describe the above-described embodiments of the display apparatus, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0130] Referring to Figure 8 In an embodiment, the display unit 100 can include the first display panel 110, the second display panel 120, and the third display panel 130. In such an embodiment, the first display panel 110 through the third display panel 130 can be spaced apart from each other. The first display panel 110 and the second display panel 120 can be spaced apart from each other by a second distance L2, and the second display panel 120 and the third display panel 130 can be spaced apart from each other by the second distance L2. In such an embodiment, Figure 8 The second distance L2 between the first display panel 110 through the third display panel 130 shown in may be greater than Figure 7 the first distance L1 between the first display panel 110 through the third display panel 130 shown in .

[0131] The light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first display panel 110 to the third display panel 130 with each other. The light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330. In such an embodiment, light of the first image IMG1 whose optical path is changed by the first diffraction module 310 is guided in the base 301 toward the second diffraction module 320, and light of the third image IMG3 whose optical path is changed by the third diffraction module 330 is guided in the base 301 toward the second diffraction module 320.

[0132] Figure 9 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. Except for the light path controller 300, Figure 9 The display apparatus of Figure 8 The display apparatus of Figure 9 The same or similar elements shown in the display apparatus are labeled with the same reference numerals as those used in the above description of the embodiments of the display apparatus, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0133] Referring to Figure 9 In an embodiment, the light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first display panel 110 to the third display panel 130 with each other. The light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0134] The first diffraction module 310 can be disposed on one surface 301a of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can change an optical path of the first image IMG1 of the first display panel 110 toward an opposite surface 301b of the base 301. The light of the first image IMG1 can be totally reflected within the base 301 and guided to the second diffraction module 320. In one embodiment, for example, a diffraction grating of the first diffraction module 310 is arranged at a first pitch corresponding to a wavelength of the light of the first image IMG1, so that the light of the first image IMG1 can be totally reflected within the base 301 and guided to the second diffraction module 320.

[0135] The diffraction grating of the first diffraction module 310 has a first depth and is arranged at a first pitch corresponding to a wavelength of the light of the first image IMG1, so that the light of the first image IMG1 can be totally reflected within the base 301 and guided to the second diffraction module 320.

[0136] The second diffraction module 320 can be disposed on one surface 301a of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the output unit 510.

[0137] The second diffraction module 320 can reflect light of the first image IMG1 that is totally reflected within the base 301 and incident on the second diffraction module 320 toward the output unit 510. The second diffraction module 320 can reflect light of the third image IMG3 that is totally reflected within the base 301 and incident on the second diffraction module 320 toward the output unit 510. In one embodiment, for example, a diffraction grating of the second diffraction module 320 is arranged with a second pitch that does not affect a wavelength of light of the second image IMG2, such that light of the second image IMG2 is transmitted through the second diffraction module 320 toward the output unit 510, and light of the first image IMG1 and light of the third image IMG3 are reflected by the second diffraction module 320 toward the output unit 510.

[0138] The third diffraction module 330 can be disposed on one surface 301a of the base 301 to correspond to the third display panel 130. The third diffraction module 330 can change a light path of the third image IMG3 of the third display panel 130 to be toward an opposite surface 301b of the base 301. Light of the third image IMG3 can be totally reflected within the base 301 and provided to the second diffraction module 320. In one embodiment, for example, a diffraction grating of the third diffraction module 330 is arranged with a third pitch corresponding to a wavelength of light of the third image IMG3, such that light of the third image IMG3 can be totally reflected within the base 301 and guided to the second diffraction module 320.

[0139] In one alternative embodiment, for example, a diffraction grating of the third diffraction module 330 has a third depth and is arranged with a third pitch corresponding to a wavelength of light of the third image IMG3, such that light of the third image IMG3 can be totally reflected within the base 301 and guided to the second diffraction module 320.

[0140] Figure 10 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. In addition to the light path controller 300, Figure 10 The display apparatus of Figures 4 to 6 The display apparatus of Figure 10 The same or similar elements shown in the display apparatus are labeled with the same reference numerals as those used in the above description of the embodiments of the display apparatus, and any repetitive detailed description thereof will be omitted or simplified hereinafter.

[0141] Referring to Figure 10In an embodiment, the light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first to third display panels 110 to 130 with each other. The light path controller 300 includes a first base 302, a first diffraction module 310, a second diffraction module 320, a second base 303, a third diffraction module 330, and a fourth diffraction module 340.

[0142] The first base 302 can directly transmit light incident from the display unit 100. One surface 302a of the first base 302 facing the lens unit 200 and an opposite surface 302b of the first base 302 opposite to one surface 303a of the second base 303 can be parallel to each other. The direction of light passing through the one surface 302a of the first base 302 can be the same as the direction of light passing through the opposite surface 302b of the first base 302. The first base 302 can support the first diffraction module 310 and the second diffraction module 320.

[0143] The first diffraction module 310 can be disposed on the one surface 302a of the first base 302 to correspond to the first display panel 110. The first diffraction module 310 can change the light path of the first image IMG1 of the first display panel 110 toward the second diffraction module 320. The first diffraction module 310 can include diffraction gratings arranged at a first pitch. In one embodiment, for example, the diffraction gratings of the first diffraction module 310 are arranged at a first pitch corresponding to the light wavelength of the first image IMG1, such that the first diffraction module 310 changes the light path of the first image IMG1 toward the second diffraction module 320. In one alternative embodiment, for example, the diffraction gratings of the first diffraction module 310 have a first depth and are arranged at a first pitch corresponding to the light wavelength of the first image IMG1, such that the first diffraction module 310 changes the light path of the first image IMG1 toward the second diffraction module 320.

[0144] The second diffraction module 320 can be disposed on the other surface 302b of the first base 302 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the fourth diffraction module 340.

[0145] The second diffraction module 320 can change the light path of light incident from the first diffraction module 310 toward the fourth diffraction module 340. In one embodiment, for example, the diffraction gratings of the second diffraction module 320 are arranged at a second pitch not affecting the light wavelength of the second image IMG2, such that the light of the second image IMG2 is transmitted toward the fourth diffraction module 340 through the second diffraction module 320, and the second diffraction module 320 changes the light path of the first image IMG1 toward the fourth diffraction module 340.

[0146] The second base 303 can directly transmit light incident from the first base 302. One surface 303a of the second base 303 facing the opposite surface 302b of the first base 302 and the opposite surface 303b of the second base 303 facing the output unit 510 can be parallel to each other. The direction of light passing through one surface 303a of the second base 303 can be the same as the direction of light passing through the opposite surface 303b of the second base 303. The second base 303 can support the third diffraction module 330 and the fourth diffraction module 340.

[0147] The third diffraction module 330 can be disposed on one surface 303a of the second base 303 to correspond to the third display panel 130. The third diffraction module 330 can change the optical path of light of the third image IMG3 of the third display panel 130 to be toward the fourth diffraction module 340.

[0148] The fourth diffraction module 340 can be disposed on the opposite surface 303b of the second base 303 to correspond to the second diffraction module 320. The fourth diffraction module 340 can transmit light of the first image IMG1 and light of the second image IMG2 provided from the second diffraction module 320 to the output unit 510. In one embodiment, for example, the diffraction grating of the fourth diffraction module 340 is arranged with a fourth pitch that does not affect the wavelength of light of the first image IMG1 and the wavelength of light of the second image IMG2, so that the fourth diffraction module 340 transmits light of the first image IMG1 and light of the second image IMG2 toward the output unit 510. In such an embodiment, the fourth pitch of the fourth diffraction module 340 can be different from the first pitch to the third pitch of the first diffraction module 310 to the third diffraction module 330.

[0149] The fourth diffraction module 340 can change the optical path of light incident from the third diffraction module 330 to be toward the output unit 510. In one embodiment, for example, the diffraction grating of the fourth diffraction module 340 is arranged with a fourth pitch that does not affect the wavelength of light of the first image IMG1 and the wavelength of light of the second image IMG2, so that the fourth diffraction module 340 changes the optical path of the third image IMG3 to be toward the output unit 510.

[0150] The output unit 510 can be disposed on the opposite surface 303b of the second base 303 to correspond to the fourth diffraction module 340. The composite image CI can include the light of the first image IMG1 and the light of the second image IMG2 that have passed through the fourth diffraction module 340, and the light of the third image IMG3 whose optical path is changed by the fourth diffraction module 340. Accordingly, the display apparatus 10 can display the composite image CI having the same resolution as the resolutions of the first to third display panels 110 to 130. By combining the first to third images IMG1 to IMG3 via the optical path controller 300 rather than directly stacking the first to third display panels 110 to 130 in the thickness direction thereof, the thickness of the display apparatus 10 can be reduced.

[0151] Figure 11 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. Except for the optical path controller 300, Figure 11 the display apparatus of Figure 10 is substantially the same as the display apparatus of Figure 11 The same or similar elements shown in

[0152] Referring to Figure 11 , in an embodiment, the optical path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first to third display panels 110 to 130 on each other. The optical path controller 300 includes a first base 302, a first diffraction module 310, a second diffraction module 320, a second base 303, a third diffraction module 330, and a fourth diffraction module 340.

[0153] The first diffraction module 310 can be disposed on the opposite surface 302b of the first base 302 to correspond to the first display panel 110. The first diffraction module 310 can reflect the light of the first image IMG1 of the first display panel 110 toward the second diffraction module 320. In one embodiment, for example, a diffraction grating of the first diffraction module 310 is arranged at a first pitch corresponding to the wavelength of the light of the first image IMG1, such that the first diffraction module 310 reflects the light of the first image IMG1 toward the second diffraction module 320. In one alternative embodiment, for example, a diffraction grating of the first diffraction module 310 has a first depth and is arranged at a first pitch corresponding to the wavelength of the light of the first image IMG1, such that the first diffraction module 310 reflects the light of the first image IMG1 toward the second diffraction module 320.

[0154] The second diffraction module 320 can be disposed on one surface 302a of the first base 302 to correspond to the second display panel 120. The second diffraction module 320 can transmit light of the second image IMG2 of the second display panel 120 toward the fourth diffraction module 340. In one embodiment, for example, the diffraction grating of the second diffraction module 320 is arranged with a second pitch that does not affect the wavelength of light of the second image IMG2, such that the second diffraction module 320 transmits light of the second image IMG2 toward the fourth diffraction module 340.

[0155] The second diffraction module 320 can reflect light incident from the first diffraction module 310 toward the fourth diffraction module 340.

[0156] In one optional embodiment, for example, the diffraction grating of the second diffraction module 320 has a second depth and is arranged with a second pitch that does not affect the wavelength of light of the second image IMG2, such that the second diffraction module 320 transmits light of the second image IMG2 toward the fourth diffraction module 340 and reflects light of the first image IMG1 toward the fourth diffraction module 340.

[0157] The third diffraction module 330 can be disposed on one surface 303a of the second base 303 to correspond to the third display panel 130. The third diffraction module 330 can change an optical path of light of the third image IMG3 of the third display panel 130 to be toward the fourth diffraction module 340.

[0158] The fourth diffraction module 340 can be disposed on an opposite surface 303b of the second base 303 to correspond to the second diffraction module 320. The fourth diffraction module 340 can transmit light of the first image IMG1 and light of the second image IMG2 provided from the second diffraction module 320 to the output unit 510. In one embodiment, for example, the diffraction grating of the fourth diffraction module 340 is arranged with a fourth pitch that does not affect the wavelength of light of the first image IMG1 and the wavelength of light of the second image IMG2, such that the fourth diffraction module 340 transmits light of the first image IMG1 and light of the second image IMG2 toward the output unit 510. In such an embodiment, the fourth pitch of the fourth diffraction module 340 can be different from the first pitch to the third pitch of the first diffraction module 310 to the third diffraction module 330.

[0159] The fourth diffraction module 340 can change an optical path of light incident from the third diffraction module 330 to be toward the output unit 510. In one embodiment, for example, the diffraction grating of the fourth diffraction module 340 is arranged with a fourth pitch that does not affect the wavelength of light of the first image IMG1 and the wavelength of light of the second image IMG2, such that the fourth diffraction module 340 changes an optical path of the third image IMG3 to be toward the output unit 510.

[0160] In one alternative embodiment, for example, the diffraction grating of the fourth diffraction module 340 has a fourth depth and is arranged at a fourth pitch such that the fourth diffraction module 340 transmits the light of the first image IMG1 and the light of the second image IMG2 toward the output unit 510 and changes the optical path of the light of the third image IMG3 toward the output unit 510.

[0161] Figure 12 A process of generating a composite image in a display apparatus according to still another alternative embodiment is illustrated. Figure 12 The display apparatus of Figure 5 differs from the display apparatus of Figure 12 The same or similar elements shown in

[0162] Referring to Figure 12 , the light path controller 300 can include a base 301, a first diffraction module 310, a second diffraction module 320, and a third diffraction module 330.

[0163] The first diffraction module 310 can be disposed on one surface 301a of the base 301 to correspond to the first display panel 110. The first diffraction module 310 can change the optical path of the first image IMG1 of the first display panel 110 toward the second diffraction module 320.

[0164] The second diffraction module 320 can be disposed on an opposite surface 301b of the base 301 to correspond to the second display panel 120. The second diffraction module 320 can transmit the light of the second image IMG2 of the second display panel 120 and allow the light to be focused to a specific point positioned in front of the output unit 510. In one embodiment, for example, the diffraction grating of the second diffraction module 320 is arranged at a second pitch corresponding to the wavelength of the light of the second image IMG2 such that the second diffraction module 320 transmits and focuses the light of the second image IMG2 to the specific point in front of the output unit 510.

[0165] The second diffraction module 320 can change the optical path of the light incident from the first diffraction module 310 to the specific point in front of the output unit 510. The second diffraction module 320 can change the optical path of the light incident from the third diffraction module 330 to the specific point in front of the output unit 510. In one embodiment, for example, the diffraction grating of the second diffraction module 320 is arranged at a second pitch corresponding to the wavelength of the light of the first image IMG1 to the third image IMG3 such that the second diffraction module 320 focuses the light of the first image IMG1 and the light of the third image IMG3 to the specific point in front of the output unit 510.

[0166] The display device 10 can use the light path controller 300 to focus light of the first image IMG1 to the third image IMG3 to a specific point in front of the output unit 510. In such an embodiment, the specific point of light focus can be a point at which the user's eye EYE is located. Accordingly, the display device 10 can control a focal point of the composite image CI without a separate optical lens.

[0167] Figure 13 A process of generating a composite image in a display device according to yet another alternative embodiment is illustrated.

[0168] Referring to Figure 13 An embodiment of the display unit 100 can include a first display panel 110, a second display panel 120, and a third display panel 130.

[0169] The first display panel 110 can be disposed on a first plane, and can include a plurality of pixels that emit light of a first color. The pixels of the first display panel 110 can emit light of the first color to display a first image IMG1 of the first color.

[0170] The second display panel 120 can be disposed on a second plane that intersects the first plane, and can be disposed at a side of the first display panel 110. Accordingly, the first display panel 110 and the second display panel 120 can be misaligned with each other. The second display panel 120 can include a plurality of pixels that emit light of a second color. The second display panel 120 can emit light of the second color, which is different from the first color of the first display panel 110, to display a second image IMG2 of the second color.

[0171] The third display panel 130 can be disposed on a third plane that intersects the first plane and the second plane, and can be disposed at a side of the second display panel 120. Accordingly, the first display panel 110 to the third display panel 130 can be misaligned with each other, i.e., not on the same plane. The third display panel 130 can include a plurality of pixels that emit light of a third color. The third display panel 130 can emit light of the third color, which is different from the first color of the first display panel 110 and the second color of the second display panel 120, to display a third image IMG3 of the third color.

[0172] The light path controller 300 can be disposed to face the lens unit 200, and can generate a composite image CI by superimposing the images of the first display panel 110 to the third display panel 130 on each other. The light path controller 300 can include a base 301 and a first diffraction module 310.

[0173] The base 301 can directly transmit light incident from the display unit 100. The base 301 can include a first surface 301a, a second surface 301b, a third surface 301c, and a fourth surface 301d. The first surface 301a of the base 301 can be disposed in parallel with the first display panel 110 or the first plane. The second surface 301b of the base 301 can be disposed in parallel with the second display panel 120 or the second plane. The third surface 301c of the base 301 can be disposed in parallel with the third display panel 130 or the third plane. Accordingly, the first surface 301a to the third surface 301c of the base 301 can not be aligned with each other.

[0174] The fourth surface 301d of the base 301 can face the output unit 510 and can support the first diffraction module 310.

[0175] The first diffraction module 310 can transmit light of the first image IMG1 to the third image IMG3 and allow the light to be focused to a specific point defined in front of the output unit 510. Light of the first image IMG1 can pass through the first surface 301a of the base 301 and be provided to the first diffraction module 310. Light of the second image IMG2 can pass through the second surface 301b of the base 301 and be provided to the first diffraction module 310. Light of the third image IMG3 can pass through the third surface 301c of the base 301 and be provided to the first diffraction module 310.

[0176] In one embodiment, for example, the diffraction grating of the first diffraction module 310 is arranged at a first pitch corresponding to the wavelength of the light of the first image IMG1 to the third image IMG3, so that the light of the first image IMG1 to the third image IMG3 can be transmitted and focused to a specific point disposed in front of the output unit 510.

[0177] In one alternative embodiment, for example, the diffraction grating of the first diffraction module 310 can have a first depth and be arranged at a first pitch corresponding to the wavelength of the light of the first image IMG1 to the third image IMG3, so that the light of the first image IMG1 to the third image IMG3 can be transmitted and focused on a specific point disposed in front of the output unit 510.

[0178] The display apparatus 10 can use the light path controller 300 to focus the light of the first image IMG1 to the third image IMG3 to a specific point in front of the output unit 510. In such an embodiment, the specific point of light focusing can be a point at which the user's eye EYE is located. Accordingly, the display apparatus 10 can control the focal point of the composite image CI without a separate optical lens.

[0179] The present application should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

[0180] While the application has been particularly shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit or scope of the application as defined by the appended claims.

Claims

1. A display apparatus comprising: a display unit including a plurality of display panels displaying images of different colors; a lens unit on the display unit; a light path controller on the lens unit, wherein the light path controller generates a composite image by superimposing the images displayed by the plurality of display panels on each other; and an output unit disposed corresponding to the display unit and having a size smaller than a size of the plurality of display panels, through which the composite image is displayed; wherein the light path controller controls a light path of light incident on a first side of the light path controller facing the lens unit and a light path of light incident on a second side of the light path controller opposite the first side, and provides the composite image to the output unit.

2. The display device according to claim 1, wherein the display unit includes: a first display panel displaying a first image of a first color; a second display panel at a side of the first display panel, wherein the second display panel displays a second image of a second color different from the first color; and a third display panel at a side of the second display panel, wherein the third display panel displays a third image of a third color different from the first color and the second color.

3. The display device according to claim 2, wherein the light path controller includes: a base transmitting light of the first image through the third image; a first diffraction module on a second surface of the base, wherein the first diffraction module reflects the light of the first image; a second diffraction module on a first surface of the base opposite the second surface, wherein the second diffraction module reflects the light of each of the first image and the third image toward the output unit and transmits the light of the second image toward the output unit; and a third diffraction module on the second surface of the base, wherein the third diffraction module reflects the light of the third image toward the second diffraction module.

4. The display device according to claim 2, wherein the light path controller includes: a base transmitting light of the first image through the third image; a first diffraction module on a first surface of the base, wherein the first diffraction module changes a light path of the light of the first image; a second diffraction module on a second surface of the base opposite the first surface, wherein the second diffraction module changes the light path of the light of each of the first image and the third image to be toward the output unit and transmits the light of the second image toward the output unit; and a third diffraction module on the first surface of the base, wherein the third diffraction module changes the light path of the light of the third image to be toward the second diffraction module.

5. The display device according to claim 2, wherein the light path controller includes: a base transmitting light of the first image through the third image; a first diffraction module on a second surface of the base, wherein the first diffraction module transmits the light of the first image toward the output unit and changes a light path of the light of each of the second image and the third image to be toward the output unit; and a second diffraction module on a first surface of the base opposite the second surface, wherein the second diffraction module changes the light path of the light of the third image to be toward the output unit. a second diffraction module on a first surface of the base opposite the second surface, wherein the second diffraction module changes the optical path of the light of the second image toward the first diffraction module; and a third diffraction module on the first surface of the base, wherein the third diffraction module changes the optical path of the light of the third image toward the first diffraction module.

6. The display device according to claim 2, wherein The optical path controller comprises: a first base on the lens unit; a first diffraction module on a first surface of the first base corresponding to the first display panel; a second diffraction module on a second surface of the first base corresponding to the second display panel; a second base on the first base; a third diffraction module on a first surface of the second base corresponding to the third display panel; and a fourth diffraction module on a second surface of the second base corresponding to the output unit.

7. The display device according to claim 2, wherein The optical path controller comprises: a first base on the lens unit; a first diffraction module on a second surface of the first base corresponding to the first display panel; a second diffraction module on a first surface of the first base corresponding to the second display panel; a second base on the first base; a third diffraction module on a first surface of the second base corresponding to the third display panel; and a fourth diffraction module on a second surface of the second base corresponding to the output unit.

8. The display device according to claim 2, wherein The optical path controller comprises: a base transmitting light of the first image to the third image; a first diffraction module on a first surface of the base, wherein the first diffraction module changes an optical path of the light of the first image; a second diffraction module on a second surface of the base opposite the first surface, wherein the second diffraction module changes the optical path of the light of each of the first image and the third image, and transmits the light of the second image; and a third diffraction module on the first surface of the base, wherein the third diffraction module changes the optical path of the light of the third image toward the second diffraction module, wherein the second diffraction module focuses the light of the first image to the third image to a specific point in front of the output unit.

9. The display device according to claim 1, wherein The display unit comprises: a first display panel displaying a first image of a first color; a second display panel spaced apart from the first display panel by a predetermined distance, wherein the second display panel displays a second image of a second color different from the first color; and a third display panel spaced apart from the second display panel by a predetermined distance, wherein the third display panel displays a third image of a third color different from the first color and the second color, wherein the optical path controller comprises: a base transmitting light of the first image to the third image; a first diffraction module on a first surface of the base, wherein the first diffraction module changes an optical path of the light of the first image; a second diffraction module on a second surface of the base opposite the first surface, wherein the second diffraction module changes the optical path of the light of each of the first image and the third image, and transmits the light of the second image; and a third diffraction module on the first surface of the base, wherein the third diffraction module changes the optical path of the light of the third image toward the second diffraction module, wherein the second diffraction module focuses the light of the first image to the third image to a specific point in front of the output unit. a second diffractive module on a second surface of the base opposite the first surface, wherein the second diffractive module changes the optical path of the light of each of the first and third images to be towards the output unit and transmits the light of the second image towards the output unit; and a third diffractive module on the first surface of the base, wherein the third diffractive module changes the optical path of the light of the third image to be towards the second diffractive module.

10. The display device according to claim 1, wherein The display unit includes: a first display panel on a first plane, wherein the first display panel displays a first image of a first color; a second display panel on a second plane intersecting the first plane, wherein the second display panel displays a second image of a second color different from the first color; and a third display panel on a third plane intersecting the first and second planes, wherein the third display panel displays a third image of a third color different from the first and second colors, wherein the optical path controller includes a base that transmits light of the first to third images, wherein the base includes a first surface parallel to the first plane, a second surface parallel to the second plane, a third surface parallel to the third plane, and a fourth surface facing the output unit, wherein the base further includes a diffractive module on the fourth surface of the base, wherein the diffractive module focuses the light of the first to third images to a specific point in front of the output unit.

Images