Patent Publication Number: US-2022221721-A1

Title: Display panel, display device, and control method of display device

Description:
This application claims priority to Korean Patent Application No. 10-2021-0002255, filed on Jan. 8, 2021, and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference. 
     BACKGROUND 
     1. Field 
     The disclosure relates to a display panel, a display device, and a control method of the display device. 
     2. Description of the Related Art 
     Recently, electronic devices including display devices are provided in a form that can be worn on a body. Such electronic devices are commonly referred to as wearable electronic devices. The wearable electronic devices may be directly worn on the body, thereby improving portability and user accessibility. 
     The wearable electronic devices may include a head mounted electronic device, e.g., a head mount display (“HMD”) device that may be mounted on a head portion or a head of a wearer. The HMD device may be generally classified into a see-through type for providing the augmented reality (“AR”) and a see-closed type for providing the virtual reality (“VR”). 
     SUMMARY 
     Embodiments of the disclosure provides a display panel, a display device, and a control method of the display device for implementing a device having a slim thickness. 
     An embodiment of a display device includes a display unit including a first surface through which light is emitted, a second surface opposite to the first surface, and a plurality of transmissive regions which transmits infrared light incident on the first surface; a first lens and a second lens disposed on the first surface of the display unit, where a plurality of channels, through which the light emitted from the first surface of the display unit passes, is defined in the first lens and the second lens; a plurality of infrared light sources disposed on the first surface of the display unit, where the plurality of infrared light sources emits infrared light; and a plurality of infrared cameras disposed on the second surface of the display unit to overlap the plurality of transmissive regions. 
     An embodiment of a display panel in a head mounted display includes a substrate; a plurality of conductive layers disposed on the substrate; a plurality of insulating layers insulating the plurality of conductive layers from each other; and a transmissive region which transmits at least a part of light incident on the display panel and disposed to overlap a sensor which detects a position of a user&#39;s pupil, where the transmissive region includes a transmissive hole defined through at least one selected from the plurality of conductive layers and the plurality of insulating layers. 
     An embodiment of a control method of a display device includes detecting a position of a user&#39;s pupil based on infrared light, which is reflected from the user&#39;s pupil and received through a plurality of transmissive regions of a display unit; and displaying a display image corresponding to the position of the user&#39;s pupil on the display unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other features of the disclosure will become more apparent by describing in detail embodiments thereof with reference to the attached drawings, in which: 
         FIG. 1  is a perspective view of a display device according to an embodiment; 
         FIG. 2  is a plan view of a plurality of lenses and a display unit according to an embodiment; 
         FIGS. 3A and 3B  are perspective views of a first lens according to an embodiment; 
         FIG. 4  is a cross-sectional view taken along line A-A′ in  FIG. 2 ; 
         FIG. 5  is a plan view of the display unit; 
         FIG. 6  is a plan view of a transmissive region according to an embodiment; 
         FIG. 7  is a cross-sectional view taken along line B-B′ in  FIG. 6 ; 
         FIG. 8  is a plan view of a transmissive region according to an alternative embodiment; 
         FIG. 9  is a view illustrating a case in which a user&#39;s pupil is positioned at an origin; 
         FIG. 10  is a view illustrating a screen photographed by an infrared camera when the user&#39;s pupil is positioned at the origin; 
         FIG. 11  is a view illustrating a display image displayed by a display unit when the user&#39;s pupil is positioned at the origin; 
         FIG. 12  is a view illustrating a virtual reality (“VR”) image recognized by the user when the user&#39;s pupil is positioned at the origin; 
         FIG. 13  is a view illustrating a case in which the user&#39;s pupil is positioned in a first quadrant; 
         FIG. 14  is a view illustrating a screen photographed by an infrared camera when the user&#39;s pupil is positioned in the first quadrant; 
         FIG. 15  is a view illustrating a display image displayed by the display unit when the user&#39;s pupil is positioned in the first quadrant; 
         FIG. 16  is a view illustrating a VR image recognized by the user when the user&#39;s pupil is positioned in the first quadrant. 
         FIG. 17  is a view illustrating the arrangement of a plurality of infrared cameras according to an alternative embodiment; 
         FIG. 18  is a view illustrating a screen photographed by a first infrared camera of  FIG. 17 ; and 
         FIG. 19  is a flowchart of a control method of the display device according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in 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 will filly convey the scope of the invention to those skilled in the art. The same reference numbers indicate the same components throughout the specification. In the attached figures, the thickness of layers and regions is exaggerated for clarity. 
     It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. 
     It will be understood that, although the terms “first,” “second,” “third” etc. may 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,” “component,” “region,” “layer” or “section” discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, “a”, “an,” “the,” and “at least one” do not denote a limitation of quantity, and are intended to include both the singular and plural, unless the context clearly indicates otherwise. For example, “an element” has the same meaning as “at least one element,” unless the context clearly indicates otherwise. “At least one” is not to 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 further understood that the terms “comprises” and/or “comprising,” or “includes” 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. 
     Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element&#39;s relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The term “lower,” can therefore, encompasses both an orientation of “lower” and “upper,” depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The terms “below” or “beneath” can, therefore, encompass both an orientation of above and below. 
     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. 
     Embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims. 
     Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a display device according to an embodiment. 
     An embodiment of the display device  1  may be a head mounted display device that is mounted on a user&#39;s head and provides a screen on which an image or a video is displayed to a user. 
     The head mounted display device may be a see-through type head mounted display device that provides the augmented reality based on actual external objects, or a see-closed type head mounted display device that provides the virtual reality to a user with a screen independent from external objects. Hereinafter, for convenience of description, embodiments where the display device  1  is the see-closed type head mounted display device will be described in detail, but the disclosure is not limited thereto. 
     Referring to  FIG. 1 , an embodiment of the display device  1  may include a main frame MF, a display unit DP, a multi-channel lens LS, and a cover frame CF. 
     The main frame MF may be worn on the user&#39;s face. The main frame MF may have a shape corresponding to a shape of the user&#39;s head (or face). A first lens LS 1 , a second lens LS 2 , the display unit DP, and the cover frame CF may be disposed or mounted on the main frame MF. The main frame MF may include a structure defining a space in which the display unit DP, the first lens LS 1 , and the second lens LS 2  may be accommodated. Although not shown in the drawing, the main frame MF may further include a structure such as a strap or a band to facilitate mounting, and a control unit, an image processing unit, and a lens accommodating unit may be further mounted on the main frame MF. 
     The display unit DP may display an image and/or a video. The display unit DP may include a front surface DP_FS on which the image and/or the video is displayed and a rear surface DP_RS opposite to the front surface DP_FS. Light for providing the image and/or the video may be emitted from the front surface DP_FS of the display unit DP. As described later, the first lens LS 1  and the second lens LS 2  may be disposed on the front surface DP_FS of the display unit DP, and a plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may be disposed on the rear surface DP_RS of the display unit DP. 
     The display unit DP may be detachably fixed to the main frame MF. The display unit DP may be configured to be opaque, transparent, or translucent according to a design of the display device  1 , for example, a type of the display device  1 . 
     The display unit DP may include an electronic component such as a display module including a display panel to be described later, or may be a display device such as a mobile terminal including a display panel, but the disclosure is not limited thereto. 
     The display unit DP may include a display panel for displaying an image or a video. 
     The display panel DP may be a light-emitting display panel including a light-emitting element. In one embodiment, for example, a display panel  300  may be an organic light-emitting display panel using an organic light-emitting diode (“LED”) including an organic light-emitting layer, a micro LED display panel using a micro LED, a quantum dot light-emitting display panel using a quantum dot LED including a quantum dot light-emitting layer, or an inorganic light-emitting display panel using an inorganic light-emitting element including an inorganic semiconductor. Hereinafter, for convenience of description, embodiments where the display panel DP is an organic light-emitting display panel will be described in detail, but the disclosure is not limited thereto. 
     The multi-channel lens LS may pass light emitted from the display unit DP to provide the light to the user. The multi-channel lens LS may provide a plurality of channels for passing the light emitted from the display unit DP. The plurality of channels may pass the light emitted from the display unit DP through different paths to provide the light to the user. The light emitted from the display unit DP may be incident on each of the channels so that an enlarged image may be focused on the user&#39;s eyes. 
     In an embodiment, as shown in  FIG. 1 , the multi-channel lens LS may include the first lens LS 1  and the second lens LS 2 . 
     The first lens LS 1  and the second lens LS 2  may be disposed on the front surface DP_FS of the display unit DP. The first lens LS 1  and the second lens LS 2  may be arranged on the front surface DP_FS of the display unit DP corresponding to positions of the user&#39;s left and right eyes. The first lens LS 1  and the second lens LS 2  may be accommodated in the main frame MF. 
     The first lens LS 1  and the second lens LS 2  may reflect and/or refract light for providing an image and/or a video displayed on the display unit DP to the user. As described later, a plurality of infrared light sources (see “IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , IFR_L 8 ” in  FIG. 2 ) may be disposed at one side of (or on a first surface of) each of the first lens LS 1  and the second lens LS 2  facing the main frame MF (the user&#39;s eyes). 
     The cover frame CF may be disposed on the rear surface DP_RS of the display unit DP to protect the display unit DP. The plurality of infrared cameras to be described later (see “IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , IFR_C 8 ” in  FIGS. 4 and 5 ) may be interposed between the cover frame CF and the display unit DP, but the disclosure is not limited thereto. 
     Although not shown in the drawing, the display device  1  may further include a control unit for controlling an overall operation of the display device  1 . 
     The control unit may control an operation of at least one selected from the display unit DP, the plurality of infrared light sources (see “IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , IFR_L 8 ” in  FIG. 2 ), and the plurality of infrared cameras (see “IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , IFR_C 8 ” in  FIGS. 4 and 5 ). The control unit may analyze images acquired by the infrared cameras (see “IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , IFR_C 8 ” in  FIGS. 4 and 5 ), calculate a position of user&#39;s pupil (PP in  FIG. 5 ), image processing (image mapping) based on the images, and perform an operation for displaying an image processed on the display unit DP. The control unit may be implemented with a dedicated processor including an embedded processor and/or a general-purpose processor including a central processing unit or an application processor, but the disclosure is not limited thereto. 
       FIG. 2  is a plan view of a plurality of lenses and a display unit according to an embodiment.  FIGS. 3A and 3B  are perspective views of a first lens according to an embodiment.  FIG. 4  is a cross-sectional view taken along line A-A′ in  FIG. 2 .  FIG. 5  is a plan view of a display unit.  FIG. 6  is a plan view of a transmissive region according to an embodiment.  FIG. 7  is a cross-sectional view taken along line B-B′ in  FIG. 6 . 
     Referring to  FIGS. 1 and 2 , as shown in  FIG. 2 , the first lens LS 1  and the second lens LS 2  may be disposed on the front surface DP_FS of the display unit DP, and may be disposed in positions corresponding to the user&#39;s eyes. In one embodiment, for example, the display unit DP may have an approximately rectangular shape that is long in a lateral direction (a horizontal direction in  FIG. 2 ) on a plane, and the first lens LS 1  may be positioned on one side (a firsts side or a left side in  FIG. 2 ) on the front surface DP_FS of the display unit DP, and the second lens LS 2  may be positioned on another side (a second side or a right side of  FIG. 2 ) on the front surface DP_FS of the display unit DP. Herein, the phrase “on a plane” may mean “when viewed on a plane or in a plan view in a thickness direction of a display unit DP or the first or second lens LS 1  or LS 2 . In an embodiment, the first lens LS 1  and the second lens LS 2  may be disposed symmetrically based on a center line of the display unit DP, and the first lens LS 1  and the second lens LS 2  may have substantially a same or similar structure as each other, but the disclosure is not limited thereto. 
     The first lens LS 1  and the second lens LS 2  may include a plurality of sub-lenses LS 11 , LS 12 , LS 13 , and LS 14  and a plurality of sub-lenses LS 21 , LS 22 , LS 23 , and LS 24 , respectively. 
     In an embodiment, the first lens LS 1  may include a first sub-lens LS 11 , a second sub-lens LS 12 , a third sub-lens LS 13 , and a fourth sub-lens LS 14 . The second lens LS 2  may include a fifth sub-lens LS 21 , a sixth sub-lens LS 22 , a seventh sub-lens LS 23 , and an eighth sub-lens LS 24 . However, in embodiments of the invention, the number of the plurality of sub-lenses LS 11 , LS 12 , LS 13 , LS 14 , LS 21 , LS 22 , LS 23 , and LS 24  is not limited thereto. 
     In such an embodiment, the second lens LS 2  is substantially the same as or similar to the first lens LS 1 . Accordingly, the first lens LS 1  will hereinafter be mainly described. 
     Referring to  FIG. 2 , the first lens LS 1  may have an approximately circular shape on a plane. The first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , and the fourth sub-lens LS 14  may be disposed to surround a center of the circle on a plane, for example, in a clover shape. In one embodiment, for example, as shown in  FIG. 2 , the first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , and the fourth sub-lens LS 14  may be disposed at an upper right portion, an upper left portion, a lower left portion, and a lower right portion based on a center of the first lens LS 1 , respectively. The first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , and the fourth sub-lens LS 14  may be integrally connected with each other (e.g., integrally formed as a single unitary unit) or separated from each other. 
       FIG. 3A  is a perspective view illustrating one side (or a first side) of the first lens LS 1  facing the user&#39;s eye.  FIG. 3B  is a perspective view illustrating another side (or a second side opposite to the first side) of the first lens LS 1  facing the display unit DP. 
     Referring further to  FIGS. 3A and 3B , in an embodiment, the first lens LS 1  may have an approximately hemispherical shape. One side of the first lens LS 1  facing the main frame MF (or the user&#39;s eye) may have a convex shape, and the other side of the first lens LS 1  facing the display unit DP may have a concave shape. 
     In such an embodiment, the second lens LS 2  may have an approximately hemispherical shape, but the fifth sub-lens LS 21 , the sixth sub-lens LS 22 , the seventh sub-lens LS 23 , and the eighth sub-lens LS 24  may be disposed in a shape surrounding a center of the second lens LS 2  on a plane, for example, in a clover shape. 
     Referring to  FIG. 5 , the plurality of sub-lenses LS 11 , LS 12 , LS 13 , LS 14 , LS 21 , LS 22 , LS 23 , and LS 24  may each provide a plurality of channels through which light emitted from the front surface DP_FS of the display unit DP passes. Light emitted from different regions of the front surface DP_FS of the display unit DP may pass through each channel in different paths. The light may each include a partial video and/or a partial image for constituting one complete virtual reality (“VR”) image (see “IMG_V” in  FIGS. 12 and 16 ). 
     In one embodiment, for example, as shown in  FIG. 5 , the first sub-lens LS 11  may provide a channel trough which light IMG 1  emitted from one region of the display unit DP (for example, an upper end portion of the display unit DP of  FIG. 4 ) passes, and the fourth sub-lens LS 14  may provide a channel through which light IMG 2  emitted from another region of the display unit DP (for example, a lower end portion of the display unit DP of  FIG. 4 ) passes. The one region and the other region of the display unit DP may include a region overlapping the first sub-lens LS 11  and a region overlapping the fourth sub-lens LS 14 , respectively. 
     In such an embodiment, although not shown in the drawing, the second sub-lens LS 12  and the fourth sub-lens LS 14  may each provide channels through which light emitted from different regions of the display unit DP passes. 
     In an embodiment, light passing through each of the sub-lenses LS 11 , LS 12 , LS 13 , LS 14 , LS 21 , LS 22 , LS 23 , and LS 24  may be provided to the user through two refractions and two reflections, but the disclosure is not limited thereto. 
     Referring again to  FIGS. 2 and 4 , the display device  1  may further include the plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7  and IFR_L 8 . 
     The plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , and IFR_L 8  may be disposed on the first lens LS 1  and the second lens LS 2 . The plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , and IFR_L 8  may be disposed on one convex side of the first lens LS 1  and one convex side of the second lens LS 2  facing the main frame MF (or the user&#39;s eyes). 
     The plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , and IFR_L 8  may include a first infrared light source IFR_L 1 , a second infrared light source IFR_L 2 , a third infrared light source IFR_L 3 , a fourth infrared light source IFR_L 4 , a fifth infrared light source IFR_L 5 , a sixth infrared light source IFR_L 6 , a seventh infrared light source IFR_L 7 , and an eighth infrared light source IFR_L 8 . 
     The first infrared light source IFR_L 1 , the second infrared light source IFR_L 2 , the third infrared light source IFR_L 3 , the fourth infrared light source IFR_L 4 , the fifth infrared light source IFR_L 5 , the sixth infrared light source IFR_L 6 , the seventh infrared light source IFR_L 7 , and the eighth infrared light source IFR_L 8  may be disposed on the first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , the fourth sub-lens LS 14 , the fifth sub-lens LS 21 , the sixth sub-lens LS 22 , the seventh sub-lens LS 23 , and the eighth sub-lens LS 24 , respectively. 
     In an embodiment, as shown in  FIG. 2 , the first infrared light source IFR_L 1 , the second infrared light source IFR_L 2 , the third infrared light source IFR_L 3 , and the fourth infrared light source IPFR_L 4  may be positioned inside the boundary of the first lens LS 1  on a plane, and may be disposed to surround the center of the first lens LS 1 , and the fifth infrared light source IFR_L 5 , the sixth infrared light source IFR_L 6 , the seventh infrared light source IFR_L 7 , and the eighth infrared light source IFR_L 8  may also be positioned inside the boundary of the second lens LS 2 , and may be disposed to surround the center of the second lens LS 2 , but the disclosure is not limited thereto. 
     Referring to  FIGS. 2 and 5 , the plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , and IFR_L 8  may be disposed on inclined surfaces of sub-lenses extending from the display unit DP in a direction to the user&#39;s eyes, but the disclosure is not limited thereto. 
     Referring to  FIGS. 2, 4, and 5 , the display device  1  may further include the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7  and IFR_C 8 . 
     Herein, a thickness direction may refer to a thickness direction of the display unit DP and/or an optical axis direction of the multi-channel lens LS. 
     In an embodiment, the infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may be a means for detecting a position of a user&#39;s pupil PP, but the disclosure is not limited thereto. The display device  1  may include various types of sensors capable of detecting the position of the user&#39;s pupil PP. 
     The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may be disposed on the rear surface DP_RS of the display unit DP. In an embodiment, as shown in  FIG. 4 , the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may be disposed to overlap a plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  of the display unit DP to be described later, respectively. 
     The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may sense infrared light IRL emitted from an infrared light source and reflected from the user&#39;s pupil PP. An exact position of the user&#39;s pupil PP may be calculated by ultraviolet light sensed by the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8 . 
     The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may include an image sensor capable of sensing infrared light. The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may generate image data based on the received infrared light. The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may capture an image in front of each of the infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7  and IFR_C 8 , the direction at which the user is looking may be calculated from the captured image based on the position of the user&#39;s pupil PP. 
     The plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  may include a first infrared camera IFR_C 1 , a second infrared camera IFR_C 2 , a third infrared camera IFR_C 3 , a fourth infrared camera. IFR_C 4 , a fifth infrared camera IFR_C 5 , a sixth infrared camera IFR_C 6 , a seventh infrared camera IFR_C 7  and an eighth infrared camera IFR_C 8 . 
     The first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , the fourth infrared camera IFR_C 4 , the fifth infrared camera IFR_C 5 , the sixth infrared camera IFR_C 6 , the seventh infrared camera IFR_C 7  and the eighth infrared camera IFR_C 8  may be disposed to overlap the first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , the fourth sub-lens LS 14 , the fifth sub-lens LS 21 , the sixth sub-lens LS 22 , the seventh sub-lens LS 23 , and the eighth sub-lens LS 24  in the thickness direction or on a plane, respectively. 
     Referring to  FIGS. 4 and 5 , the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4  may be disposed adjacent to the boundary of the first lens LS 1  on a plane. 
     The first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4  may be disposed to surround the center of the first lens LS 1  along the boundary of the first lens LS 1  on a plane. 
     The first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4  may overlap the boundary of the first lens LS 1  in the thickness direction or on a plane. 
     The boundary of the first lens LS 1  may refer to an edge of the first lens LS 1  adjacent to or in close contact with the front surface DP_FS of the display unit DP and/or an outermost edge of the other side of the first lens LS 1  facing the front surface DP_FS of the display unit DP. The boundary of the first lens LS 1  may include each edge of the first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , and the fourth sub-lens LS 14  that are adjacent to or in close contact with the front surface DP_FS of the display unit DP. 
     However, the disclosure is not limited thereto, and alternatively, the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4  may be disposed inside the boundary of the first lens LS 1  on a plane. 
     The fifth infrared camera IFR_C 5 , the sixth infrared camera IFR_C 6 , the seventh infrared camera IFR_C 7 , and the eighth infrared camera IFR_C 8  may also be disposed in a manner substantially the same as or similar to that of the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4 , respectively, based on the second lens LS 2 . 
     Referring to  FIG. 4 , an infrared camera that receives infrared light reflected from the user&#39;s pupil PP may be changed depending on the gaze direction of the user and/or the position of the user&#39;s pupil PP. 
     In one embodiment, for example, when the user gazes in a direction in which the first sub-lens LS 11  is positioned, infrared light emitted from the first infrared light source IFR_L 1  may be reflected from the user&#39;s pupil PP and may be received by the first infrared camera IFR_C 1 . In such an embodiment, for example, when the user gazes in a direction in which the fourth sub-lens LS 14  is positioned, infrared light emitted from the fourth infrared light source IFR_L 4  may be reflected from the user&#39;s pupil PP and may be received by the fourth infrared camera IFR_C 4 . In such an embodiment, although not shown in the drawing, when the user gazes in a direction in which the second sub-lens LS 12  is positioned or the third sub-lens LS 13  is positioned, infrared light reflected from the user&#39;s pupil PP may be received by the second infrared camera IFR_C 2  or the third infrared camera IFR_C 3 . 
     Referring to  FIGS. 4 and 5 , in an embodiment of the display device  1 , the plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7 , and IFR_L 8  and the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  are not disposed between the first lens LS 1  and the user&#39;s eyes, but are disposed on the first lens LS 1  or on the rear surface DP_RS of the display unit DP, thereby implementing a slim thickness. 
     Referring to  FIGS. 4 and 5 , an embodiment of the display unit DP may include the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8 . 
     The plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may be disposed to overlap the first lens LS 1  or the second lens LS 2  in a thickness direction or on a plane. As shown in  FIG. 5 , the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may be disposed adjacent to the boundary of the first lens LS 1  or the boundary of the second lens LS 2  on a plane. The plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may be disposed to overlap the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  in the thickness direction or on a plane, respectively. 
     Each of the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may transmit most of light incident on the front surface DP_FS of the display unit DP. Each of the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may also transmit light in a specific wavelength band, for example, only infrared light among the light incident on the front surface DP_FS of the display unit DP. The light transmitted through the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may be transferred to an infrared camera disposed on the rear surface DP_RS of the display unit DP. 
     In an embodiment, the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may each be approximately circular on a plane, but the disclosure is not limited thereto. Alternatively, the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , TR 8  may be in one of other various shapes such as a square, a triangle, a polygon, or an ellipse. 
     The plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may include a first transmissive region TR 1 , a second transmissive region TR 2 , a third transmissive region TR 3 , a fourth transmissive region TR 4 , a fifth transmissive region TR 5 , a sixth transmissive region TR 6 , a seventh transmissive region TR 7 , and an eighth transmissive region TR 8 . 
     The first transmissive region TR 1 , the second transmissive region TR 2 , the third transmissive region TR 3 , and the fourth transmissive region TR 4  may be disposed inside the boundary of the first lens LS 1  on a plane. The first transmissive region TR 1 , the second transmissive region TR 2 , the third transmissive region TR 3 , and the fourth transmissive region TR 4  may be disposed to overlap the first sub-lens LS 11 , the second sub-lens LS 12 , the third sub-lens LS 13 , and the fourth sub-lens LS 14  in the thickness direction or on a plane, respectively. 
     However, the disclosure is not limited thereto, and the first transmissive region TR 1 , the second transmissive region TR 2 , the third transmissive region TR 3 , and the fourth transmissive region TR 4  may be disposed to overlap the boundary of the first lens LS 1  in the thickness direction or on a plane. 
     The fifth transmissive region TR 5 , the sixth transmissive region TR 6 , the seventh transmissive region TR 7 , and the eighth transmissive region TR 8  may also be disposed in a manner substantially the same as or similar to the first transmissive region TR 1 , the second transmissive region TR 2 , the third transmissive region TR 3 , and the fourth transmissive region TR 4 , respectively, based on the second lens LS 2 . 
     Since the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  have substantially the same or similar structure as each other except for a position at which each transmissive region is disposed, the first transmissive region TR 1  will hereinafter be mainly described for convenience of description. 
     Referring further to  FIG. 6 , the display unit DP may include a plurality of pixels PX, but at least a part of the plurality of pixels PX may not be disposed in the first transmissive region TR 1 . That is, at least a part of the plurality of pixels PX may be removed in the first transmissive region TR 1 . 
     In an embodiment, the pixel PX may not be disposed in the first transmissive region TR 1 , and a transmissive hole TH may be defined through at least a part of a plurality of layers constituting the display unit DP. The transmissive hole TH may refer to a window through which light in a specific wavelength band, for example, infrared light passes. In an embodiment, as shown in  FIG. 6 , the transmissive hole TH may have a circular shape on a plane, but the disclosure is not limited thereto. 
     Referring further to  FIG. 7 , as described above, the display unit DP may include a display panel. 
     The display panel may include a substrate SUB, a plurality of conductive layers disposed on the substrate SUB, a plurality of insulating layers  111 ,  112 ,  113 , VIA 1 , and VIA 2  that insulate the conductive layers from each other, and an emission layer EL. 
     The substrate SUB may be disposed over a display region DA and a non-display region NDA. The substrate SUB may be a flexible substrate SUB containing a flexible material such as flexible glass or polyimide. 
     A buffer layer BF may be disposed on the substrate SUB. The buffer layer BF may prevent penetration of moisture and oxygen from the outside through the substrate SUB. The buffer layer BF may include at least one selected from a silicon nitride (SiN x ) film, a silicon oxide (SiO 2 ) film, and a silicon oxynitride (SiO x N y ) film. 
     A semiconductor layer  105  may be disposed on the buffer layer BF. The semiconductor layer  105  may form a channel of a thin film transistor. The semiconductor layer  105  may be disposed in each pixel PX of the display region DA, and/or may be disposed in the non-display region NDA. The semiconductor layer  105  may include polycrystalline silicon. 
     A first insulating layer  111  may be disposed on the semiconductor layer  105 . The first insulating layer  111  may be disposed over an entire surface of the substrate SUB. The first insulating layer  111  may be a gate insulating film having a gate insulating function. 
     The first insulating layer  111  may include a silicon compound, a metal oxide, or the like. In one embodiment, for example, the first insulating layer  111  may include silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, tantalum oxide, hafnium oxide, zirconium oxide, titanium oxide, or the like. The above-listed materials may be used alone or in combination with each other. 
     A first conductive layer may be disposed on the first insulating layer  111 . The first conductive layer may include a gate electrode GE of a thin film transistor and a first electrode CE 1  of a storage capacitor. 
     The first conductive layer may include at least one selected from molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The first conductive layer may be a single film or a stacked film including or made of at least one selected from the above-listed material. 
     A second insulating layer  112  may be disposed on the first conductive layer. The second insulating layer  112  may insulate the first conductive layer and a second conductive layer from each other. The second insulating layer  112  may be selected from the above-listed materials with respect to the first insulating layer  111 . 
     The second conductive layer may be disposed on the second insulating layer  112 . The second conductive layer may include a second electrode CE 2  of the storage capacitor. A material of the second conductive layer may be selected from the above-listed materials with respect to the first conductive layer. The first electrode CE 1  of the storage capacitor and the second electrode CE 2  of the storage capacitor may form a capacitor together with the second insulating layer  112 . 
     A third insulating layer  113  may be disposed on the second conductive layer. The third insulating layer  113  may contain at least one selected from the above-listed materials with respect to the first insulating layer  111 . In an embodiment, the third insulating layer  113  may include an organic insulating material. The organic insulating material may be selected from materials to be described later with respect to a first via layer VIA 1 . 
     A third conductive layer may be disposed on the third insulating layer  113 . The third conductive layer may include a source electrode SE, a drain electrode DE, a high potential voltage electrode ELVDDE, and a signal line. 
     The third conductive layer may include at least one selected from molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The third conductive layer may be a single film include or made of at least one selected from the above-listed materials. The third conductive layer is not limited thereto, and may be a stacked film. In one embodiment, for example, the third conductive layer may be formed in a stacked structure of Ti/Al/Ti, Mo/Al/Mo, Mo/AlGe/Mo, Ti/Cu, or the like. In an embodiment, the third conductive layer may include Ti/Al/Ti. 
     The first via layer VIA 1  may be disposed on the third conductive layer. The first via layer VIA 1  may contain an organic insulating material. The organic insulating material may include at least one selected from an acrylic resin (polyacrylic resin), an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene ether resin, a polyphenylene sulfide resin, and benzocyclobutene (“BCB”). 
     A fourth conductive layer may be disposed on the first via layer VIA 1 . The fourth conductive layer may include a data line DL, a connection electrode CNE, and a high potential voltage line ELVDDL. The data line DL may be electrically connected to the source electrode SE of the thin film transistor through a contact hole passing through the first via layer VIA 1 . The connection electrode CNE may be electrically connected to the drain electrode DE of the thin film transistor through a contact hole passing through the first via layer VIA 1 . The high potential voltage line ELVDDL may be electrically connected to the high potential voltage electrode ELVDDE through a contact hole passing through the first via layer VIA 1 . The fourth conductive layer may include at least one material selected from the above-listed materials with respect to the third conductive layer. 
     A second via layer VIA 2  may be disposed on the fourth conductive layer  150 . The second via layer VIA 2  may include at least one selected from the above-listed materials with respect to the first via layer VIA 1 . 
     An anode ANO may be disposed on the second via layer VIA 2 . The anode ANO may be electrically connected to the connection electrode CNE through a contact hole defined through the second via layer VIA 2 . 
     A bank layer BANK may be disposed on the anode ANO. A contact hole may be defined through the bank layer BANK to expose the anode ANO. The bank layer BANK may include or be made of an organic insulating material or an inorganic insulating material. In one embodiment, for example, the bank layer BANK may include at least one selected from a photoresist, a polyimide resin, an acrylic resin, a silicone compound, a polyacrylic resin, and the like. In an embodiment, as shown in  FIG. 7 , the pixel PX may be defined by an opening of the bank layer exposing the emission layer EL. 
     The emission layer EL may be disposed on an upper surface of the anode ANO and in the opening of the bank layer BANK. A cathode CAT is disposed on the emission layer EL and the bank layer BANK. The cathode CAT may be a common electrode disposed over the plurality of pixels PX. 
     A thin film encapsulation layer  170  may be disposed on the cathode CAT. The thin film encapsulation layer  170  may cover the emission layer EL or the cathode CAT. The thin film encapsulation layer  170  may be a stacked film in which inorganic films and organic films are alternately stacked with each other. In one embodiment, for example, the thin film encapsulation layer  170  may include a first encapsulation inorganic layer  171 , an encapsulation organic layer  172 , and a second encapsulation inorganic layer  173  that are sequentially stacked one on another. 
     The display panel may include a panel lower sheet CPNL disposed on a lower surface of the substrate. In one embodiment, for example, the panel lower sheet CPNL may include at least one functional layer such as, for example, a digitizer, a heat dissipation member, a shield member, and a buffer member. 
     In an embodiment, as described above, the first transmissive region TR 1  may include the transmissive hole TH. In an embodiment, the transmissive hole TH passes through the first via layer VIA 1 , the second via layer VIA 2 , and the bank layer BNK, and the third insulating layer  113  may be exposed through the transmissive hole TH. In such an embodiment, the first encapsulation inorganic layer  171  and the third insulating layer  113  may be in direct contact with each other, and the inside of the transmissive hole TH may be filled by the encapsulation organic layer  172 . 
     However, the disclosure is not limited thereto, and alternatively, the transmissive hole TH may be defined or formed further through at least one layer disposed under the first via layer VIA 1 , for example, the third insulating layer  113 , or may be defined or formed through only the bank layer BNK and/or the first via layer VIA 1 . In another alternative embodiment, the transmissive hole TH may be defined or formed completely through the display panel. 
     The second transmissive region TR 2 , the third transmissive region TR 3 , the fourth transmissive region TR 4 , the fifth transmissive region TR 5 , the sixth transmissive region TR 6 , the seventh transmissive region TR 7 , and the eighth the transmissive region TR 8  have a structure substantially the same as or similar to that of the first transmissive region TR 1 , and thus any repetitive detailed descriptions thereof will be omitted. 
       FIG. 8  is a plan view of a transmissive region according to an alternative embodiment. 
     Referring to  FIG. 8 , unlike the embodiment of  FIG. 7 , at least one pixel PX may be disposed in the first transmissive region TR 1 . In such an embodiment, a plurality of transmissive holes TH may be defined in the first transmissive region TR 1 , and a plurality of pixels PX may be disposed between the plurality of transmissive holes TH. 
     The plurality transmissive hole TH may have a structure substantially the same as or similar to that of the transmissive hole TH of  FIG. 7 . In an embodiment, each of the plurality transmissive hole TH may have a rectangular shape on a plane, but the disclosure is not limited thereto. Alternatively, the plurality transmissive hole TH may be in one of other various shapes such as a triangle, a polygon, a circle, or an ellipse. 
     In such an embodiment, although not shown in the drawing, the plurality of pixels PX and the plurality of transmissive holes TH disposed therebetween may also be disposed in the second transmissive region TR 2 , the third transmissive region TR 3 , the fourth transmissive region TR 4 , the fifth transmissive region TR 5 , the sixth transmissive region TR 6 , the seventh transmissive region TR 7 , and the eighth transmissive region TR 8 . 
     The embodiment of  FIG. 8  is substantially the same as or similar to the embodiment of  FIGS. 1 to 7  except that the pixel PX is disposed in the first transmissive region TR 1 , and thus any repetitive detailed descriptions of the same or like elements will be omitted. 
       FIG. 9  is a view illustrating a case in which a user&#39;s pupil is positioned at an origin.  FIG. 10  is a view illustrating a screen photographed by an infrared camera when the user&#39;s pupil is positioned at the origin.  FIG. 11  is a view illustrating a display image displayed by a display unit when the user&#39;s pupil is positioned at the origin.  FIG. 12  is a view illustrating a VR image recognized by the user when the user&#39;s pupil is positioned at the origin. 
     As described above, in an embodiment of the display device  1 , since the configuration and operation corresponding to one eye of the user (e.g., the left eye) are substantially the same as or similar to the configuration and operation corresponding to the other eye of the user (e.g., the right eye), hereinafter, the configuration corresponding to the one eye (the first lens LS 1 , the first infrared light source IFR_L 1 , the second infrared light source IFR_L 2 , the third infrared light source IFR_L 3 , the fourth infrared light source IFR_L 4 , the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , the fourth infrared camera IFR_C 4 , and the like) will be mainly described. 
     Referring to  FIG. 9 , as described above, the position of the user&#39;s pupil PP may be calculated based on images captured by the plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8 . The display device  1  may display a display image DP_IMG on the display unit DP based on the calculated position of the user&#39;s pupil PP. The display image DP_IMG may be an image to which a mapping algorithm corresponding to the position of the user&#39;s pupil PP is applied by the control unit of the display device  1 . 
     As shown in  FIG. 9 , in an embodiment, virtual planes P 1 _ 1 , P 1 _ 2 , P 1 _ 3 , and PT_ 4  for setting coordinates corresponding to the position of the user&#39;s pupil PP may be defined. The virtual planes P 1 _ 1 , P 1 _ 2 , P 1 _ 3 , and P 1 _ 4  may be disposed parallel to the display unit DP. An origin CC of the virtual planes P 1 _ 1 , P 1 _ 2 , P 1 _ 3 , and PT_ 4  may overlap the center of the first lens LS 1  and/or the display image DP_IMG displayed on the display unit DP in the thickness direction. In one embodiment, for example, the control unit may detect an outline of the user&#39;s pupil PP and set a center point of a shape defined by the corresponding outline as the coordinates of the pupil PP. 
     The virtual planes P 1 _ 1 , P 1 _ 2 , P 1 _ 3 , and PT_ 4  are defined by a first axis AX 1  extending in one direction and a second axis AX 2  crossing the first axis AX 1 , and may include a first quadrant P 1 _ 1 , a second quadrant P 1 _ 2 , a third quadrant P 1 _ 3 , and a fourth quadrant PT_ 4  arranged in a counterclockwise direction when looking at the display unit DP based on the origin CC. 
     When the user gazes in a direction in which the first sub-lens LS 11  is positioned, the user&#39;s pupil PP may be positioned in the first quadrant P 1 _ 1 . In addition, when the user gazes in a direction in which the second sub-lens LS 12  is positioned, the user&#39;s pupil PP may be positioned in the second quadrant P 1 _ 2 , when the user gazes in a direction in which the third sub-lens LS 13  is positioned, the user&#39;s pupil PP may be positioned in the third quadrant P 1 _ 3 , and when the user gazes in a direction in which the fourth sub-lens LS 14  is positioned, the user&#39;s pupil PP may be positioned in the fourth quadrant P 1 _ 4 . 
     When the user gazes in the direction in which the first sub-lens LS 11  is positioned, when the user gazes in a direction in which the second sub-lens LS 12  is positioned, when the user gazes in a direction in which the third sub-lens LS 13  is positioned, and when the user gazes in a direction in which the fourth sub-lens LS 14  is positioned may refer to when the user gazes at a first divided viewing region VAT, when the user gazes at a second divided viewing region VA 2 , when the user gazes at a third divided viewing region VA 3 , and when the user gazes at a fourth divided viewing region VA 4  to be described later, respectively. 
     Referring to  FIGS. 9 and 10 , when the user&#39;s pupil PP is approximately positioned at the origin CC, the user&#39;s pupil PP may not be recognized by the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4 . 
     A case in which the user&#39;s pupil PP is approximately positioned at the origin CC may refer to a case in which the user gazes a center of the first lens LS 1 , the display image DP_IMG, and/or a VR image IMG_V to be described later. 
     As shown in  FIG. 10 , when the user&#39;s pupil PP is approximately positioned at the origin CC, the user&#39;s pupil PP may not be detected in a detection region SA of an image captured by the first infrared camera IFR_C 1 . 
     Referring to  FIGS. 9 to 11 , when the user&#39;s pupil PP is not recognized by the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4 , the control unit may determine that the user gazes at the center of the first lens LS 1 , the display image DP_IMG, and/or the VR image IMG_V to be described later. In this case, the display unit DP may display the display image DP_IMG corresponding to the position of the user&#39;s pupil PP (the coordinates of the pupil PP). 
     Referring to  FIG. 11 , the display unit DP may display divided display images DP_IMG 11 , DP_IMG 12 , DP_IMG 13  and DP_IMG 14  divided into four as the display image DP_IMG. The display image DP_IMG may include a first divided display image DP_IMG 11 , a second divided display image DP_IMG 12 , a third divided display image DP_IMG 13 , and a fourth divided display image DP_IMG 14  that are arranged counterclockwise on a plane when looking at the front surface DP_FS of the display unit DP based on a center of the display image DP_IMG. 
     When the user&#39;s pupil PP is approximately positioned at the origin CC (for example, (0,0)), the first divided display image DP_IMG 11 , the second divided display image DP_IMG 12 , the third divided display image DP_IMG 13 , and the fourth divided display image DP_IMG 14  may be displayed to have approximately a same size as each other. The size of each of the divided display images DP_IMG may refer to a width in a radial direction (a diagonal direction) based on the center of the display image DP_IMG. However, the disclosure is not limited thereto, and alternatively, the size may refer to a width in a horizontal direction and/or a width in a vertical direction on a plane. 
     As shown in  FIG. 11 , the sizes of the first divided display image DP_IMG 11 , the second divided display image DP_IMG 12 , the third divided display image DP_IMG 13 , and the fourth divided display image DP_IMG 14  may be measured based on boundaries between the first divided viewing region VA 1 , the second divided viewing region VA 2 , the third divided viewing region VA 3 , and the fourth divided viewing region VA 4  to be described later, but the disclosure is not limited thereto. Alternatively, the sizes of the first divided display image DP_IMG 11 , the second divided display image DP_IMG 12 , the third divided display image DP_IMG 13 , and the fourth divided display image DP_IMG 14  may be measured based on an intersection of the boundaries disposed therebetween. 
     As shown in  FIG. 11 , a first width W 1  of the first divided display image DP_IMG 11 , a second width W 2  of the second divided display image DP_IMG 12 , a third width W 3  of the third divided display image DP_IMG 13 , and a fourth width W 4  of the fourth divided display image DP_IMG 14  may be approximately the same as each other. Accordingly, the first divided display image DP_IMG 11 , the second divided display image DP_IMG 12 , the third divided display image DP_IMG 13 , and the fourth divided display image DP_IMG 14  may be respectively displayed on the display unit DP at substantially a same magnification as each other. 
     Referring further to  FIG. 12 , the display device  1  may output a foveated-rendered VR image IMG_V to the display unit DP based on the position of the user&#39;s pupil PP. The VR image IMG_V may refer to an image and/or a video recognized by the user through the multi-channel lens LS. The foveated rendering may refer to an image processing method that minimizes a graphic computational load while implementing a high-definition VR experience with high immersion by displaying only a region in which the user gazes in the maximum image quality and expressing the other regions in low image quality. 
     Referring to  FIGS. 11 and 12 , in an embodiment, the VR image IMG_V may be generated by combining parts of a plurality of divided display images DP_IMG 11 , DP_IMG 12 , DP_IMG 13 , and DP_IMG 14 . 
     In such an embodiment, the first divided display image DP_IMG 11 , the second divided display image DP_IMG 12 , the third divided display image DP_IMG 13 , and the fourth divided display image DP_IMG 14  may include the first divided viewing region VA 1 , the second divided viewing region VA 2 , the third divided viewing region VA 3 , and the fourth divided viewing region VA 4 , respectively. 
     The first divided viewing region VA 1 , the second divided viewing region VA 2 , the third divided viewing region VA 3 , and the fourth divided viewing region VA 4  may be defined, for example, by optical characteristics of the multi-channel lens LS and the gaze direction of the user. A shape, size and/or magnification of each of the first divided viewing region VA 1 , the second divided viewing region VA 2 , the third divided viewing region VA 3 , and the fourth divided viewing region VA 4  may vary depending on the optical characteristics of the multi-channel lens LS and the gaze direction of the user. 
     When the user&#39;s pupil PP is approximately positioned at the origin CC, the display unit DP may display the display image DP_IMG so that a magnification of a central region of the display image DP_IMG is larger than that of a surrounding region of the display image DP_IMG surrounding the central region. 
     As shown in  FIG. 12 , when the user&#39;s pupil PP is approximately positioned at the origin CC, a central region of the VR image IMG_V may have a relatively higher pixel density than the surrounding region surrounding the central region. In this case, the pixel density may increase gradually from an edge of the VR image IMG_V toward the center of the VR image IMG_V. Accordingly, the central region of the VR image IMG_V may be displayed in a higher quality (or resolution) than the surrounding region. 
     The central region of the VR image IMG_V may refer to an intersection of boundaries between an image of the first divided viewing region VA 1 , an image of the second divided viewing region VA 2 , an image of the third divided viewing region VA 3 , and an image of the fourth divided viewing region VA 4  that are recognized by being combined by the user, and an adjacent region surrounding the intersection, but the disclosure is not limited thereto. 
       FIG. 13  is a view illustrating a case in which the user&#39;s pupil is positioned in a first quadrant.  FIG. 14  is a view illustrating a screen photographed by an infrared camera when the user&#39;s pupil is positioned in the first quadrant.  FIG. 15  is a view illustrating a display image displayed by the display unit when the user&#39;s pupil is positioned in the first quadrant.  FIG. 16  is a view illustrating a VR image recognized by the user when the user&#39;s pupil is positioned in the first quadrant. 
     Referring to  FIG. 13 , when the user&#39;s pupil PP is positioned at a position other than the origin CC, the user&#39;s pupil PP may be recognized by at least one among the first infrared camera IFR_C 1 , the second infrared camera IFR_C 2 , the third infrared camera IFR_C 3 , and the fourth infrared camera IFR_C 4 . 
     Referring to  FIGS. 13 and 14 , for example, when the user&#39;s pupil PP is positioned in the first quadrant P 1 _ 1 , infrared light reflected from the user&#39;s pupil PP may be received by the first infrared camera IFR_C 1 . As shown in  FIG. 14 , the user&#39;s pupil PP may be detected in the detection region SA of the image captured by the first infrared camera IFR_C 1 . 
     A direction in which the user gazes, specific regions SP 1 , SP 2 , and SP 3  in which the user gazes in the display images DP_IMG, and/or specific regions SP 1 , SP 2 , and SP 3  in which the user gazes in the VR images IMG_V may be calculated based on the detected position of the user&#39;s pupil PP. In one embodiment, for example, when the user&#39;s pupil PP is positioned in a first position LO 1 , the control unit may determine that the user gazes a first gaze region SP 1  of the VR image IMG_V based on a pre-stored lookup table. In such an embodiment, when the user&#39;s pupil PP is positioned in a second position LO 2  or a third position LO 3 , the control unit may determine that the user gazes a second gaze region SP 2  or a third gaze region SP 3  of the VR image IMG_V. The lookup table may be generated through an experiment for deriving a correlation between the position of the user&#39;s pupil PP captured by the infrared camera and actual coordinates of the user&#39;s pupil PP. 
     Referring to  FIGS. 13 to 15 , when the direction in which the user gazes and/or the specific regions SP 1 , SP 2 , and SP 3  of the VR images IMG_V in which the user gazes are calculated, the display unit DP may display a display image DP_IMG corresponding thereto. As described above, the display image DP_IMG may be an image in which mapping of an image corresponding to the position of the user&#39;s pupil PP has been performed. 
     In one embodiment, for example, when the user&#39;s pupil PP is positioned in the first quadrant P 1 _ 1 , as shown in  FIG. 15 , the display unit DP may display the display image DP_IMG so that the first divided viewing region VA 1  has a size larger than the remaining divided regions VA 2 , VA 3 , and VA 4 . In this case, the size of each of the second divided viewing region VA 2  and the fourth divided viewing region VA 4  may be smaller than that of the first divided viewing region VA 1  but larger than that of the third divided viewing region VA 3 . The size of each of the divided display images DP_IMG may refer to a width in a radial direction (a diagonal direction) based on the center of the display image DP_IMG. However, the disclosure is not limited thereto, and alternatively, the size may refer to a width in a horizontal direction and/or a width in a vertical direction on a plane. 
     As shown in  FIG. 15 , when the user&#39;s pupil PP is positioned in the first quadrant P 1 _ 1 , the first width W 1  may be larger than the second width W 2 , the third width W 3 , and the fourth width W 4 . In this case, the fourth width W 4  may be smaller than the second width W 2  and the third width W 3 . Accordingly, the first divided display image DP_IMG 11  may be displayed on the display unit DP at the largest magnification, and the second divided display image DP_IMG 12  and the third divided display image DP_IMG 13  may be displayed at a magnification smaller than the first divided display image DP_IMG 11 , and the fourth divided display image DP_IMG 14  may be displayed at the smallest magnification. 
     Although not shown in the drawing, even when the user&#39;s pupil PP is positioned in the second quadrant P 1 _ 2 , the third quadrant P 1 _ 3 , or the fourth quadrant P 1 _ 4 , the display image DP_IMG mapped by a manner substantially the same as or similar to the above may be displayed on the display unit DP. 
     Referring to  FIGS. 13 to 16 , when the user&#39;s pupil PP is positioned in the first quadrant P 1 _ 1 , the specific regions SP 1 , SP 2 , and SP 3  of the VR image IMG_V corresponding to the first quadrant P 1 _ 1 , for example, an upper right end of  FIG. 16  may have a relatively higher pixel density than the surrounding region. In this case, the pixel density may increase gradually from the edge of the VR image IMG_V toward the specific regions SP 1 , SP 2 , and SP 3  of the VR image IMG_V. Accordingly, the specific regions SP 1 , SP 2 , and SP 3  of the VR image IMG_V may be displayed in higher quality than the surrounding region, but images in the surrounding region may be displayed in a relatively lower quality than the image of the first divided viewing region VA 1 . In  FIG. 16 , three specific regions SP 1 , SP 2 , and SP 3  are shown, but the number and area of the specific regions SP 1 , SP 2 , and SP 3  are not limited thereto. 
       FIG. 17  is a view illustrating the arrangement of a plurality of infrared cameras according to an alternative embodiment.  FIG. 18  is a view illustrating a screen photographed by a first infrared camera of  FIG. 17 . 
     Referring to  FIG. 17 , unlike the embodiment of  FIGS. 1 to 16 , only two infrared cameras IFR_C 1  and IFR_C 2  may be disposed corresponding to one eye of a user. 
     In such an embodiment, as shown in  FIG. 17 , a first infrared camera IFR_C 1  and a second infrared camera IPR_C 2  may be disposed to overlap a first transmissive region TR 1  and a second transmissive region TR 2  on a rear surface DP_RS of a display unit DP, respectively, on a plane. 
     Each of the first infrared camera IFR_C 1  and the second infrared camera IPR_C 2  may include a wide-angle lens. Accordingly, the first infrared camera IFR_C 1  and the second infrared camera IFR_C 2 , even when a user&#39;s pupil PP is positioned in a third quadrant P 1 _ 3  or a fourth quadrant P 1 _ 4 , the user&#39;s pupil PP may be detected. That is, when the wide-angle lens is applied, a position of the user&#39;s pupil PP may be accurately detected even with a small number of infrared cameras IFR_C 1  and IFR_C 2  compared to the embodiment of  FIGS. 1 to 16 . 
     Referring to  FIGS. 17 and 18 , when the user&#39;s pupil PP is positioned in the third quadrant P 1 _ 3 , the user&#39;s pupil PP may be detected by the first infrared camera IFR_C 1 . In one embodiment, for example, as shown in  FIG. 17 , infrared light reflected from the user&#39;s pupil PP may be incident on the third sub-lens LS 13  and then reflected and/or refracted to be incident on the first sub-lens LS 11 , and the infrared light incident on the first sub-lens LS 11  may be reflected and/or refracted again to be incident on the first infrared camera IFR_C 1 , but a path of the infrared light is not limited thereto. Similarly, although not shown in the drawing, when the user&#39;s pupil PP is positioned in the fourth quadrant P 1 _ 4 , the user&#39;s pupil PP may be detected by the second infrared camera IFR_C 2 . 
     Referring to  FIG. 18 , when the user&#39;s pupil PP is positioned in the third quadrant P 1 _ 3 , the user&#39;s pupil PP may be detected in a second detection region SA_E spaced apart from a first detection region SA among images captured by the first infrared camera IFR_C 1 . Referring further to  FIG. 14 , the first detection region SA may be a region in which the user&#39;s pupil PP is detected when the user&#39;s pupil PP is positioned in the first quadrant P 1 _ 1 . In  FIG. 18 , the second detection region SA_E may be positioned at a lower left portion of the first detection region SA, and may be smaller than the first detection region SA, but the position and size of the second detection region SA_E are not limited. 
     Referring further to  FIG. 9 , although not shown in the drawing, when only the third infrared camera IFR_C 3  and the fourth infrared camera IFR_C 4  are used, or even when only the first infrared camera IFR_C 1  and the fourth infrared camera IFR_C 4  (the second infrared camera IFR_C 2  and the third infrared camera IFR_C 3 ) are used, an effect substantially the same as or similar to that of the embodiment of  FIG. 17  may be obtained. 
       FIG. 19  is a flowchart of a control method of a display device according to an embodiment. 
     Referring to  FIG. 19 , an embodiment of a control method of a display device  1  may include detecting a position of a user&#39;s pupil PP based on infrared light received through a plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  of a display unit DP, and displaying a display image DP_IMG corresponding to the position of the user&#39;s pupil PP on the display unit DP. 
     The control method of the display device  1  may be a control method of a head mounted display. The control method of the display device  1  may be performed by the above-described control unit. 
     The detecting of the position of the user&#39;s pupil PP may include receiving the infrared light through a transmissive hole TH defined through at least one of a plurality of layers constituting the display unit DP. 
     The detecting of the position of the user&#39;s pupil PP may include receiving the infrared light through a plurality of transmissive holes TH disposed between a plurality of pixels PX in the transmissive region. 
     The detecting of the position of the user&#39;s pupil PP may include receiving the infrared light emitted from a plurality of infrared light sources IFR_L 1 , IFR_L 2 , IFR_L 3 , and IFR_L 4 , IFR_L 5 , IFR_L 6 , IFR_L 7  and IFR_L 8  disposed for each of a plurality of sub-lenses L 11 , L 12 , L 13 , L 14 , L 21 , L 22 , L 23 , and L 24  using a plurality of infrared cameras IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7 , and IFR_C 8  disposed to overlap the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  on a rear surface DP_RS of the display unit DP. 
     The displaying of the display image DP_IMG may include magnifying and displaying a magnification of specific regions SP 1 , SP 2 , and SP 3  positioned in a direction in which the user gazes among the display image DP_IMG based on the position of the user&#39;s pupil PP. 
     However, the control method of the display device  1  is not limited to those described above, and at least some of the operations may be omitted, or at least one or more other operations may be further included with reference to other descriptions of the specification. 
     Referring further to  FIGS. 9 and 13 , the position of the user&#39;s pupil PP may be detected by the plurality of infrared camera IFR_C 1 , IFR_C 2 , IFR_C 3 , IFR_C 4 , IFR_C 5 , IFR_C 6 , IFR_C 7  and IFR_C 8  disposed to respectively overlap the plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  on the rear surface DP_RS of the display unit DP, thereby determining the direction in which the user gazes. 
     The plurality of transmissive regions TR 1 , TR 2 , TR 3 , TR 4 , TR 5 , TR 6 , TR 7 , and TR 8  may include at least one transmissive hole TH as shown in  FIGS. 6 and 8 , or may further include a plurality of pixels PX. 
     In one embodiment, for example, as shown in  FIG. 9 , when the user gazes the center of the first lens LS 1 , the infrared light IFR_R reflected from the user&#39;s pupil PP is not received by the first to fourth infrared cameras IFR_C 1  to IFR_C 4 , and thus the user&#39;s pupil PP may not be detected. In this case, the coordinates of the user&#39;s pupil PP may be determined as (0,0). 
     When the coordinates of the user&#39;s pupil PP are determined as (0,0), the display unit DP may display a display image DP_IMG corresponding to the user&#39;s coordinates as shown in  FIG. 11  on the front surface DP_FS of the display unit DP. As shown in  FIGS. 11 and 12 , the divided display images DP_IMG 11 , DP_IMG 12 , DP_IMG 13 , and DP_IMG 14  of the display image DP_IMG may be adjusted in size and/or magnification so that the center region of the VR image IMG_V determined to as being gazed by the user has the highest image quality. 
     In such an embodiment, when the user gazes at a region other than the central region of the first lens LS 1 , the user&#39;s pupil PP may be detected by at least one among the first infrared camera IPR_C 1  to the fourth infrared camera IPR_C 4 . 
     In one embodiment, for example, as shown in  FIG. 13 , when the user gazes a direction in which the first lens LS 1  is positioned, the user&#39;s pupil PP may be detected by the first infrared camera IPR_C 1 . In this case, the coordinates of the user&#39;s pupil PP may be determined to be positioned in the first quadrant P 1 _ 1  (e.g., (3,1)). 
     When the coordinates of the user&#39;s pupil PP are determined as (3,1), the display unit DP may display a display image DP_IMG corresponding to the user&#39;s coordinates on the front surface DP_FS of the display unit DP as shown in  FIG. 15 . As shown in  FIGS. 15 and 16 , the divided display images DP_IMG 11 , DP_IMG 12 , DP_IMG 13 , and DP_IMG 14  of the display image DP_IMG may be adjusted in size and/or magnification so that the specific region SP 1 , SP 2 , and SP 3  of the VR image IMG_V determined as being gazed by the user have the highest image quality. 
     Referring further to  FIGS. 17 and 18 , the position of the user&#39;s pupil PP may be detected with only two infrared cameras IFR_C 1  and IFR_C 2  per one eye of the user. 
     In one embodiment, for example, as shown in  FIG. 17 , only the first infrared camera IFR_C 1  and the second infrared camera IFR_C 2  may be disposed on the rear surface DP_RS of the display unit DP. As shown in  FIG. 18 , when the user&#39;s pupil PP is positioned in the third quadrant P 1 _ 3 , the user&#39;s pupil PP may be detected through the first infrared camera IPR_C 1 . In this case, the user&#39;s pupil PP may be detected in the second detection region SA_E different from the first detection region SA. 
     In embodiments of a display panel, a display device, and a control method of the display device according to the invention, infrared light sources and infrared cameras are not disposed between lens and the user&#39;s eyes, but are disposed on the lens or on the rear surface of the display unit, thereby implementing a slim thickness. 
     The invention should not be construed as being 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 concept of the invention to those skilled in the art. 
     While the invention has been particularly shown and described with reference to embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit or scope of the invention as defined by the following claims.