Holographic display

Abstract

Provided is a holographic display. The holographic display comprises: a light source panel including a first surface and a second surface positioned opposite to each other, and including a plurality of light source pixels spaced apart from each other; and a spatial light modulator disposed on the first surface of the light source panel and including a plurality of light modulation pixels spaced apart from each other, wherein the plurality of light source pixels and the plurality of light modulation pixels correspond one-to-one to each other, and the light source panel includes incoherent light sources.

Description

holographic display

[0001] The present invention relates to a holographic display.

[0002] As the information society develops, demand for display devices capable of displaying images is increasing in various forms. In particular, holographic displays utilize the principle of reproducing an image of an original object by diffracting a reference light onto a holographic pattern, which records the interference pattern created by interfering the object light reflected from the original object with a reference light.

[0003] Meanwhile, as a type of digital holographic display, research is actively being conducted on a holographic display that provides a computer-generated hologram (CGH) as an electrical signal to a spatial light modulator instead of directly exposing an original object to obtain a hologram pattern, and the spatial light modulator forms a hologram pattern according to the input CGH signal and diffracts a reference light to create a 3D image.

[0004] The problem to be solved by the present invention is to provide a holographic display using an incoherent light source.

[0005] Another problem that the present invention seeks to solve is to provide a holographic display having a thin profile and a wide viewing angle.

[0006] Another problem that the present invention seeks to solve is to provide a holographic display capable of complex modulation.

[0007] The tasks of the present invention are not limited to the tasks mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0008] According to one embodiment of the present invention for solving the above problem, a holographic display includes a light source panel including a first side and a second side positioned on opposite sides and including a plurality of light source pixels spaced apart from each other, a spatial light modulator disposed on the first side of the light source panel and including a plurality of light modulation pixels spaced apart from each other, wherein the plurality of light source pixels and the plurality of light modulation pixels correspond one-to-one to each other, and the light source panel includes an incoherent light source.

[0009] The device further includes an array lens interposed between the light source panel and the spatial light modulator, and the array lens may include a plurality of lens sections corresponding one-to-one to the plurality of light source pixels.

[0010] The plurality of lens units may be configured to focus light emitted from the plurality of light source pixels onto the plurality of light modulation pixels, respectively.

[0011] The device further includes a holography generation unit configured to generate a hologram pattern based on phase information of lights emitted from the plurality of light source pixels, wherein the holography generation unit is configured to provide the hologram pattern to the spatial light modulator, and the spatial light modulator can be configured to adjust the phase of the lights emitted from the plurality of light source pixels using the hologram pattern.

[0012] The lights emitted from the plurality of light source pixels may have random phases that are the same or different from each other, and the holography generating unit may be configured to synchronize the phases of the lights by calculating the difference in the random phases of the lights.

[0013] The lights emitted from the plurality of light source pixels have random phases that are the same or different from each other, and the holography generating unit is configured to reflect the difference in the random phases of the lights into the hologram pattern and provide the hologram pattern to the spatial light modulator, and the spatial light modulator can be configured to generate a hologram image using the hologram pattern in which the difference in the random phase is reflected.

[0014] The light source panel further includes a light source driving device that drives the plurality of light source pixels, the spatial light modulator further includes a light modulation driving device that drives the plurality of light modulation pixels, and the light source driving device and the light modulation driving device may be provided separately.

[0015] The above light source driving device may include at least one of a light source timing control unit, a light source display driving unit, a light source gate driving unit, a light emission control driving unit, and a light source power supply unit, and the light modulation driving device may include at least one of a light modulation timing control unit, a column-axis light modulation driving unit, a row-axis light modulation driving unit, and a light modulation power supply unit.

[0016] The light source panel may be configured to control the amplitude of the lights emitted from the plurality of light source pixels, and the spatial light modulator may be configured to control the phase of the lights emitted from the plurality of light source pixels.

[0017] The above light source panel and the above spatial light modulator may have a planar or plate-shaped shape.

[0018] An optical member is disposed on the second surface of the light source panel, and the optical member can be configured to adjust the size of the image.

[0019] The distance between the plurality of light source pixels may be 2 μm or less.

[0020] The distance between the plurality of optical modulation pixels may be 2 μm or less.

[0021] The distance between the plurality of light source pixels may be greater than the width of each of the plurality of light source pixels.

[0022] The distance between the plurality of light modulation pixels may be greater than the width of each of the plurality of light modulation pixels.

[0023] The plurality of light source pixels and the plurality of light modulation pixels may be arranged to be staggered from each other in the thickness direction.

[0024] The plurality of light source pixels can emit light toward the first surface, and the plurality of light modulation pixels can reflect the light emitted from the plurality of light source pixels toward the second surface.

[0025] The reflection angle of the lights reflected from the plurality of light modulation pixels may be greater than 0 and less than 90 degrees.

[0026] The above spatial light modulator may be a reflective spatial light modulator.

[0027] The above light source panel and the above spatial light modulator may have a curved shape.

[0028] According to another embodiment for solving the above problem, a holographic display includes a light source panel including a plurality of light-emitting portions spaced apart from each other and a first transmitting portion alternately arranged with the plurality of light-emitting portions, a spatial light modulator disposed on the light source panel and including a plurality of reflecting portions spaced apart from each other, wherein the plurality of light-emitting portions and the plurality of reflecting portions correspond one-to-one to each other, the light source panel includes an incoherent light source, and light emitted from the plurality of light-emitting portions is configured to be reflected by the reflecting portions and pass through the first transmitting portion, and the reflecting portions are configured to adjust a phase of the light emitted from the light-emitting portions.

[0029] The above spatial light modulator further includes a light-shielding portion arranged alternately with the reflecting portion, and the light-shielding portion can absorb or block at least a portion of the light emitted from the light-emitting portion.

[0030] The method further includes an array lens interposed between the light source panel and the spatial light modulator, wherein the array lens includes a lens portion corresponding one-to-one to the light emitting portion, and the lens portion can be configured to focus the light emitted from the light emitting portion onto the reflector.

[0031] The above array lens may further include a second transmitting portion arranged alternately with the lens portion, and the light emitted from the light emitting portion may be configured to pass through the second transmitting portion before passing through the first transmitting portion after being reflected by the reflecting portion.

[0032] The above lens unit may have multiple different refractive indices for each region.

[0033] The above reflector may be configured to be tilted in a direction different from the extension direction of the spatial light modulator.

[0034] The plurality of light-emitting parts and the plurality of reflecting parts can be arranged parallel to each other in the thickness direction.

[0035] The plurality of light-emitting parts and the plurality of reflecting parts may be arranged to be staggered from each other in the thickness direction.

[0036] The above light source panel and the above spatial light modulator may have a curved shape.

[0037] According to a holographic display according to one embodiment of the present invention, an incoherent light source can be used.

[0038] According to one embodiment of the present invention, a holographic display can have a thin profile and a wide viewing angle.

[0039] According to a holographic display according to one embodiment of the present invention, complex modulation may be possible.

[0040] The effects according to the embodiments are not limited to those exemplified above, and more diverse effects are included in this specification.

[0041] FIG. 1 is a perspective view illustrating a holographic display according to one embodiment.

[0042] FIG. 2 is an exploded perspective view showing a holographic display according to one embodiment.

[0043] FIG. 3 is a cross-sectional view showing a holographic display according to one embodiment.

[0044] FIG. 4 is a plan view showing a light source panel according to one embodiment.

[0045] FIG. 5A is a cross-sectional view showing an example of a light source panel according to one embodiment.

[0046] FIG. 5b is a cross-sectional view showing another example of a light source panel according to one embodiment.

[0047] Fig. 5c is a cross-sectional view showing a light emitting diode element of the light source panel of Fig. 5b.

[0048] FIG. 5d is a cross-sectional view showing another example of a light source panel according to one embodiment.

[0049] FIG. 6 is a plan view showing a spatial light modulator according to one embodiment.

[0050] FIG. 7 is a cross-sectional view showing a holographic display according to one embodiment.

[0051] FIG. 8 is a cross-sectional view showing a holographic display according to another embodiment.

[0052] FIG. 9 is a cross-sectional view showing a holographic display according to another embodiment.

[0053] FIG. 10 is a cross-sectional view showing a holographic display according to another embodiment.

[0054] Fig. 11 is a cross-sectional view showing a holographic display according to another embodiment.

[0055] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined solely by the scope of the claims.

[0056] When elements or layers are referred to as being "on" another element or layer, this includes both cases where the other element or layer is directly above the other element or layer or where there is another layer or material intervening therebetween. Similarly, references to "below," "left," and "right" include both cases where the other element or layer is directly adjacent to the other element or where there is another layer or material intervening therebetween. Like reference numerals throughout the specification refer to like elements.

[0057] Specific embodiments are described below with reference to the attached drawings.

[0058] FIG. 1 is a perspective view illustrating a holographic display according to one embodiment.

[0059] Referring to FIG. 1, a holographic display (10) according to one embodiment can reproduce an image of an original object by diffracting a reference light onto a holographic pattern that records an interference pattern obtained by interfering the object light reflected from the original object with the reference light. For example, the holographic display (10) can generate and reproduce a holographic image (HI) of a three-dimensional shape.

[0060] In some embodiments, the holographic display (10) can generate a holographic image (HI) using information about a digitized object via a computer instead of an actual original object. For example, a computer-generated hologram (CGH) generated by a holography generation unit (500) (see FIG. 2) is provided as an electrical signal to a spatial light modulator (300) (see FIG. 2), and the spatial light modulator (300) (see FIG. 2) can generate a holographic image (HI) by diffracting a reference light to form a holographic pattern.

[0061] The holographic image (HI) generated by the holographic display (10) according to the present embodiment is formed three-dimensionally in a three-dimensional space using interference of light, so that the user (PS) can view the holographic image (HI) with the naked eye without wearing separate glasses or a head mounted display (HMD).

[0062] Fig. 2 is an exploded perspective view showing a holographic display according to one embodiment. Fig. 3 is a cross-sectional view showing a holographic display according to one embodiment.

[0063] Referring to FIGS. 2 and 3, a holographic display (10) according to one embodiment may include a light source panel (100), an array lens (200), a spatial light modulator (300), an optical member (400), and a holography generating unit (500).

[0064] The light source panel (100) can emit light toward a side opposite to the side facing the user (PS). For example, the light source panel (100) can emit light toward a direction opposite to the first direction (DR1).

[0065] In the illustrated drawing, the first direction (DR1) may refer to the thickness direction of the holographic display (10). The second direction (DR2) may refer to any one of the horizontal directions perpendicular to the first direction (DR1).

[0066] The light source panel (100) may have a planar or plate-like shape extending in a direction perpendicular to the thickness direction of the holographic display (10). For example, the light source panel (100) may extend in a horizontal direction (e.g., a second direction (DR2)) perpendicular to the thickness direction in the first direction (DR1) (e.g., the first direction (DR1)). The thickness of the light source panel (100) (e.g., the length in the first direction (DR1)) may be smaller than the horizontal length of the light source panel (100) (e.g., the length in the second direction (DR2)).

[0067] The light source panel (100) may include an incoherent light source. For example, the light source panel (100) may be an organic light emitting display panel, a micro light emitting diode display panel, or a nano light emitting diode display panel. However, if the light source panel (100) is a display panel including an incoherent light source, it is not limited to the types of display panels described above.

[0068] The light source panel (100) may include a plurality of light source pixels (SP) spaced apart from each other in a second direction (DR2). The plurality of light source pixels (SP) may each emit light in a direction opposite to the first direction (DR1).

[0069] The light source panel (100) can individually control the intensity of light emitted from each of the plurality of light source pixels (SP). Accordingly, the light source panel (100) can individually control the amplitude of light emitted from each of the plurality of light source pixels (SP).

[0070] A detailed description of the structure of the light source panel (100) will be described later with reference to FIG. 4 and FIG. 5a to FIG. 5d.

[0071] The array lens (200) may be arranged on one side of the light source panel (100). For example, the array lens (200) may be arranged on one side of the light source panel (100) located in the opposite direction to the first direction (DR1). The side of the light source panel (100) on which the array lens (200) is arranged may be the opposite side facing the user (PS).

[0072] The array lens (200) may have a planar or plate-like shape extending in a direction perpendicular to the thickness direction of the holographic display (10). For example, the array lens (200) may extend in a horizontal direction (e.g., a second direction (DR2)) perpendicular to the thickness direction (e.g., a first direction (DR1)). The thickness of the array lens (200) (e.g., a length in the first direction (DR1)) may be smaller than the horizontal length of the array lens (200) (e.g., a length in the second direction (DR2)).

[0073] The array lens (200) may be a lens assembly in which a plurality of condenser lenses are aligned. For example, the array lens (200) may include a plurality of lens units (210) spaced apart from each other in the second direction (DR2). The lens units (210) may be condenser lenses. Each of the plurality of lens units (210) may include a convex lens that is convex toward the spatial light modulator (300), but is not limited thereto. In some embodiments, the plurality of lens units (210) may be configured as Fresnel lenses to reduce the thickness of the array lens (200).

[0074] A plurality of lens units (210) of the array lens (200) may be respectively arranged on a plurality of light source pixels (SP) of the light source panel (100). For example, a plurality of lens units (210) may be arranged in a one-to-one correspondence with a plurality of light source pixels (SP). The plurality of lens units (210) may each focus light emitted from a plurality of light source pixels (SP) onto a plurality of light modulation pixels (MP) of the spatial light modulator (300).

[0075] The spatial light modulator (300) may be disposed on one side of the array lens (200). For example, the spatial light modulator (300) may be disposed on one side of the array lens (200) located in the opposite direction to the first direction (DR1). The one side of the array lens (200) on which the spatial light modulator (300) is disposed may be the opposite side facing the user (PS). The spatial light modulator (300) may be disposed on the opposite side of the light source panel (100) with the array lens (200) interposed therebetween.

[0076] The spatial light modulator (300) may have a planar or plate-like shape extending in a direction perpendicular to the thickness direction of the holographic display (10). For example, the spatial light modulator (300) may extend in a horizontal direction (e.g., a second direction (DR2)) perpendicular to the thickness direction (e.g., a first direction (DR1)). The thickness of the spatial light modulator (300) (e.g., a length in the first direction (DR1)) may be smaller than the horizontal length of the spatial light modulator (300) (e.g., a length in the second direction (DR2)).

[0077] The spatial light modulator (300) may include a plurality of light modulation pixels (MP) spaced apart from each other in a second direction (DR2). The plurality of light modulation pixels (MP) may each reflect light emitted from a plurality of light source pixels (SP) in a first direction (DR1). The light reflected from the plurality of light modulation pixels (MP) may pass through the array lens (200) and the light source panel (100) and be provided to the user (PS). The user (PS) may recognize a holographic image (HI) through a virtual image of the light reflected by the spatial light modulator (300).

[0078] The spatial light modulator (300) may be a reflective spatial light modulator (300). For example, the spatial light modulator (300) may include a MO-SLM (Magneto Optical Spatial Light Modulation), a GST phase transition (Ge x Sb y Te z Phase change material) SLM, DMD (Digital Micro-mirror Device) SLM, LCoS (Liquid Crystal on Silicon) SLM, EPD (Electronic Paper Display) SLM, etc. can be used.

[0079] The holographic display (10) according to the present embodiment can be easily made thin by using a reflective spatial light modulator (300) and including planar or plate-shaped members. When using a transmissive spatial light modulator (300), it is difficult to make thin due to the complex optical system configuration for controlling the optical path, optical phase, and optical amplitude, whereas when using a reflective spatial light modulator (300), the optical system configuration can be configured simply, making thinning easy. In addition, since the materials used in the reflective spatial light modulator (300) include a wider variety of materials than those used in the transmissive spatial light modulator (300), production and manufacturing efficiency can be high.

[0080] The plurality of light modulation pixels (MP) of the spatial light modulator (300) can individually control the phase of light emitted from the plurality of light source pixels (SP) of the light source panel (100). For example, the spatial light modulator (300) can individually control the phase of light emitted from the plurality of light source pixels (SP) based on digital hologram pattern information provided from the holography generation unit (500), thereby generating a holographic image (HI).

[0081] The optical member (400) may be placed on the other side of the light source panel (100). For example, the optical member (400) may be placed on the other side of the light source panel (100) located in the first direction (DR1). The other side of the light source panel (100) on which the optical member (400) is placed may be a side facing the user (PS).

[0082] The optical member (400) can adjust the size of the image, such as enlarging or reducing the image of the holographic image (HI), by adjusting the light reflected from the spatial light modulator (300). For example, the optical member (400) can include various lenses, such as a convex lens, a concave lens, a cylindrical lens, a compound lens, a Fresnel lens, and an anamorphic lens. However, the present invention is not limited thereto, and the optical member (400) can also include other members, such as a mirror.

[0083] The holographic generation unit (500) can generate a computer-generated hologram (CGH). For example, a computer-generated hologram is a holographic pattern and can include information about the amplitude and phase of light for generating a holographic image (HI).

[0084] The holography generation unit (500) can generate a hologram pattern by reflecting information about the amplitude and phase of the lights emitted from each of the plurality of light source pixels (SP) of the light source panel (100). The holography generation unit (500) can provide a hologram pattern in which information about the amplitude and phase of the lights emitted from each of the plurality of light source pixels (SP) of the light source panel (100) is reflected to the spatial light modulator (300). The spatial light modulator (300) can individually adjust the phase of the light according to the amplitude and phase of the lights reflected in the hologram pattern.

[0085] For example, the lights emitted from each light source pixel (SP) may emit light with the same or different pseudo random phases. The holography generation unit (500) converts this random phase into a digital signal, and the phases of the lights emitted from each light source pixel (SP) can be individually controlled through the spatial light modulator (300). Accordingly, the phases of the lights emitted from each light source pixel (SP) can be synchronized with each other. Alternatively, the holography generation unit (500) may form a hologram pattern by considering the phase difference of each light without phase synchronization, and based on this, the spatial light modulator (300) may individually control the phases of each light to generate a holographic image (HI).

[0086] The holographic display (10) according to the present embodiment can control the amplitude of light using an incoherent light source and can control the phase of light using a spatial light modulator (300) and a holography generating unit (500). That is, the holographic display (10) according to the present embodiment can be a holographic display (10) capable of complex modulation of amplitude and phase.

[0087] FIG. 4 is a plan view showing a light source panel according to one embodiment.

[0088] In addition to FIG. 3, referring to FIG. 4, the light source panel (100) may include a display area (DA) and a non-display area (NDA). The display area (DA) may be positioned approximately at the center of the light source panel (100), and the non-display area (NDA) may be positioned to surround the display area (DA).

[0089] The display area (DA) of the light source panel (100) may include a plurality of light source pixels (SP), a plurality of light source power lines (VL_LS) connected to the plurality of light source pixels (SP), a plurality of gate lines (GL), a plurality of light emission control lines (ECL), and a plurality of data lines (DL).

[0090] Each of the plurality of light source pixels (SP) may be connected to a gate line (GL), a data line (DL), a light emission control line (ECL), and a light source power line (VL_LS). Each of the plurality of light source pixels (SP) may include at least one transistor, a light emitting element, and a capacitor.

[0091] The gate lines (GL) can extend in the X-axis direction and be spaced apart from each other in the Y-axis direction intersecting the X-axis direction. The gate lines (GL) can sequentially supply gate signals to a plurality of light source pixels (SP).

[0092] The emission control lines (ECLs) can extend in the X-axis direction and be spaced apart from each other in the Y-axis direction. The emission control lines (ECLs) can sequentially supply emission signals to a plurality of light source pixels (SPs).

[0093] The data lines (DL) can extend in the Y-axis direction and be spaced apart from each other in the X-axis direction. The data lines (DL) can supply data voltages to a plurality of light source pixels (SP). The data voltages can determine the brightness of each of the plurality of light source pixels (SP).

[0094] The light source power lines (VL_LS) can extend in the Y-axis direction and be spaced apart from each other in the X-axis direction. The light source power lines (VL_LS) can supply power voltage to a plurality of light source pixels (SP). The power voltage can be at least one of a driving voltage, a high-potential voltage, an initialization voltage, a reference voltage, a bias voltage, and a low-potential voltage.

[0095] The light source timing control unit (110) can receive light source digital data (DATA_LS) and timing signals from the holography generation unit (500). The light source timing control unit (110) can generate a light source data control signal (DCS) based on the timing signals. The light source timing control unit (110) can control the operation timing of the light source display driver (120) by supplying the light source digital data (DATA_LS) and the light source data control signal (DCS) to the light source display driver (120). The light source display driver (120) can convert the light source digital data (DATA_LS) into analog data voltages and supply them to the data line (DL). The light source timing control unit (110) can generate a gate control signal (GCS) based on the timing signals. The light source timing control unit (110) can control the operation timing of the light source gate driver (130) by supplying a gate control signal (GCS) to the light source gate driver (130). The light source timing control unit (110) can generate a light emission control signal (ECS) based on the timing signals. The light source timing control unit (110) can control the operation timing of the light emission control driver (140) by supplying the light emission control signal (ECS) to the light emission control driver (140).

[0096] The light source gate driver (130) and the light emission control driver (140) may be positioned on the left or right side of the non-display area (NDA). For example, the light source gate driver (130) and the light emission control driver (140) may be positioned on the left and right sides of the non-display area (NDA), but the present invention is not limited thereto. For another example, the light source gate driver (130) may be positioned on the left side of the non-display area (NDA), and the light emission control driver (140) may be positioned on the right side of the non-display area (NDA).

[0097] The light source gate driver (130) may include a plurality of transistors and generate gate signals based on a gate control signal (GCS). The gate signals of the light source gate driver (130) may select light source pixels (SP) to which a data voltage is supplied, and the selected light source pixels (SP) may receive the data voltage through data lines (DL). The light emission control driver (140) may include a plurality of transistors and generate light emission signals based on a light emission control signal (ECS). For example, the transistors of the light source gate driver (130) and the transistors of the light emission control driver (140) may be formed on the same layer as the transistors of each of the light source pixels (SP). The light source gate driver (130) may supply gate signals to the gate lines (GL), and the light emission control driver (140) may supply light emission signals to the light emission control lines (ECL).

[0098] The light source power supply unit (150) can supply power voltage to the light source display driving unit (120) and the light source panel (100). The light source power supply unit (150) can generate a driving voltage of a light emitting element and supply it to a driving voltage line, generate an initialization voltage and supply it to an initialization voltage line, generate a bias voltage and supply it to a bias voltage line, and generate a low-potential voltage and supply it to a low-potential line.

[0099] A light source timing control unit (110), a light source display driving unit (120), a light source gate driving unit (130), a light emission control driving unit (140), and a light source power supply unit (150) may be included in the light source driving device.

[0100] FIG. 5A is a cross-sectional view showing an example of a light source panel according to one embodiment.

[0101] Referring to FIG. 5a, a light source panel (100) according to one embodiment may be an organic light emitting diode display panel having an organic light emitting diode element (LEL) including an organic light emitting layer (LE).

[0102] The light source panel (100) may include a base member (BS), a display layer (DISL), an encapsulation layer (ENC), and a sensor electrode layer (SENL).

[0103] The base member (BS) may include a substrate (SUB) and a first buffer film (BF1).

[0104] The substrate (SUB) may be made of an insulating material such as glass, quartz, or a polymer resin. Examples of the polymer material include polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene napthalate (PEN), polyethylene terepthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP), or a combination thereof. Alternatively, the substrate (SUB) may include a metallic material.

[0105] The substrate (SUB) may be a rigid substrate (SUB) or a flexible substrate (SUB) that can be bent, folded, rolled, etc. If the substrate (SUB) is a flexible substrate (SUB), it may be formed of polyimide (PI), but is not limited thereto.

[0106] The first buffer film (BF1) may be disposed on the substrate (SUB). The first buffer film (BF1) may be formed of an inorganic material such as a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer. Alternatively, the first buffer film (BF1) may be formed as a multi-film in which a plurality of layers of a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer are alternately laminated.

[0107] The display layer (DISL) may include a thin film transistor layer (TFTL) including a plurality of thin film transistors and an light emitting element layer (EML) including a plurality of light emitting elements.

[0108] An active layer including a channel region (TCH), a source region (TS), and a drain region (TD) of a thin film transistor (TFT) may be disposed on a first buffer film (BF1). The active layer may be formed of polycrystalline silicon, single-crystalline silicon, low-temperature polycrystalline silicon, amorphous silicon, or an oxide semiconductor material. When the active layer includes polycrystalline silicon or an oxide semiconductor material, the source region (TS) and the drain region (TD) in the active layer may be conductive regions doped with ions or impurities to have conductivity.

[0109] A gate insulating film (GI) may be disposed on an active layer of a thin film transistor (TFT). The gate insulating film (GI) may be formed of an inorganic film, such as a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0110] A first gate metal layer including a gate electrode (TG) of a thin film transistor (TFT), a first capacitor electrode (CAE1) of a capacitor (Cst), and scan lines may be disposed on a gate insulating film (GI). The gate electrode (TG) of the thin film transistor (TFT) may overlap a channel region (TCH) in a first direction (DR1). The first gate metal layer may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0111] A first interlayer insulating film (ILD1) may be disposed on the first gate metal layer. The first interlayer insulating film (ILD1) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The first interlayer insulating film (ILD1) may include a plurality of inorganic films.

[0112] A second gate metal layer including a second capacitor electrode (CAE2) of a capacitor (Cst) may be disposed on a first interlayer insulating film (ILD1). The second capacitor electrode (CAE2) may overlap the first capacitor electrode (CAE1) in the first direction (DR1). Therefore, the capacitor (Cst) may be formed by the first capacitor electrode (CAE1), the second capacitor electrode (CAE2), and the inorganic insulating dielectric film disposed therebetween and serving as a dielectric film. The second gate metal layer may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0113] A second interlayer insulating film (ILD2) may be disposed on the second gate metal layer. The second interlayer insulating film (ILD2) may be formed of an inorganic film, such as a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The second interlayer insulating film (ILD2) may include a plurality of inorganic films.

[0114] A first data metal layer including a first connection electrode (CE1) and data lines may be disposed on a second interlayer insulating film (ILD2). The first connection electrode (CE1) may be connected to a drain region (TD) through a first contact hole (CT1) penetrating the gate insulating film (GI), the first interlayer insulating film (ILD1), and the second interlayer insulating film (ILD2). The first data metal layer may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0115] A first organic film (PVX1) for leveling the steps caused by thin film transistors (TFTs) may be disposed on the first connection electrode (CE1). The first organic film (PVX1) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0116] A second data metal layer including a second connection electrode (CE2) may be disposed on a first organic film (PVX1). The second data metal layer may be connected to the first connection electrode (CE1) through a second contact hole (CT2) penetrating the first organic film (PVX1). The second data metal layer may be formed as a single layer or multiple layers made of one or an alloy of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu).

[0117] The second organic film (PVX2) may be disposed on the second connection electrode (CE2). The second organic film (PVX2) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0118] Meanwhile, the second data metal layer including the second connection electrode (CE2) and the second organic film (PVX2) may be omitted.

[0119] An emission layer (EML) may be disposed on a thin film transistor layer (TFTL). The emission layer (EML) may include light emitting diode elements (LELs) and a bank (PDL).

[0120] Each of the light emitting diode elements (LEL) may include a pixel electrode (AE), an emission layer (LE), and a common electrode (CE). Each of the emission areas (EA) represents a region in which the pixel electrode (AE), the emission layer (LE), and the common electrode (CE) are sequentially laminated, and holes from the pixel electrode (AE) and electrons from the common electrode (CE) combine with each other in the emission layer (LE) to emit light. In this case, the pixel electrode (AE) may be an anode electrode, and the common electrode (CE) may be a cathode electrode.

[0121] A pixel electrode layer including a pixel electrode (AE) may be formed on a second organic film (PVX2). The pixel electrode (AE) may be connected to a second connection electrode (CE2) through a third contact hole (CT3) penetrating the second organic film (PVX2). The pixel electrode layer may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof.

[0122] In a top emission structure that emits light in the direction of a common electrode (CE) based on the light-emitting layer (LE), the pixel electrode (AE) may be formed as a single layer of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), or may be formed as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, or a stacked structure of an APC alloy and ITO (ITO / APC / ITO) to increase reflectivity. The APC alloy is an alloy of silver (Ag), palladium (Pd), and copper (Cu).

[0123] The bank (PDL) may serve to define the light emitting areas (EA) of the pixels. The bank (PDL) may be formed to expose a portion of the pixel electrode (AE) on the second organic film (PVX2). The bank (PDL) may cover an edge of the pixel electrode (AE). At least a portion of the bank (PDL) may be disposed within the third contact hole (CT3). That is, the third contact hole (CT3) may be filled by the bank (PDL). The bank (PDL) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0124] A spacer (SPC) may be placed on the bank (PDL). The spacer (SPC) may serve to support the mask during the process of manufacturing the light-emitting layer (LE). The spacer (SPC) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0125] An emission layer (LE) may be formed on the pixel electrode (AE). The emission layer (LE) may include an organic material and emit light of a predetermined color. For example, the emission layer (LE) may include a hole transport layer, an organic material layer, and an electron transport layer. The organic material layer may include a host and a dopant. The organic material layer may include a material that emits a predetermined light, and may be formed using a phosphorescent material or a fluorescent material.

[0126] A common electrode (CE) may be formed on the light-emitting layer (LE). The common electrode (CE) may be formed to cover the light-emitting layer (LE). The common electrode (CE) may be a common layer formed in common across the light-emitting areas (EA). A capping layer may be formed on the common electrode (CE).

[0127] In the upper light-emitting structure, the common electrode (CE) can be formed of a transparent conductive material (TCO) that can transmit light, such as ITO or IZO, or a semi-transmissive conductive material, such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). When the common electrode (CE) is formed of a semi-transmissive metallic material, the light-emitting efficiency can be increased by the micro cavity.

[0128] An encapsulation layer (ENC) may be formed on the light emitting element layer (EML). The encapsulation layer (ENC) may include at least one inorganic film to prevent oxygen or moisture from penetrating into the light emitting element layer (EML). In addition, the encapsulation layer (ENC) may include at least one organic film to protect the light emitting element layer (EML) from foreign substances such as dust. For example, the encapsulation layer (ENC) may include a first encapsulation inorganic film (TFE1), an encapsulation organic film (TFE2), and a second encapsulation inorganic film (TFE3).

[0129] A first encapsulating inorganic film (TFE1) may be disposed on a common electrode (CE), an encapsulating organic film (TFE2) may be disposed on the first encapsulating inorganic film (TFE1), and a second encapsulating inorganic film (TFE3) may be disposed on the encapsulating organic film (TFE2). The first encapsulating inorganic film (TFE1) and the second encapsulating inorganic film (TFE3) may be formed as a multi-film in which one or more inorganic films of a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer are alternately laminated. The encapsulating organic film (TFE2) may be an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0130] A sensor electrode layer (SENL) may be disposed on an encapsulation layer (ENC). The sensor electrode layer (SENL) may include sensor electrodes (TE, RE).

[0131] The second buffer film (BF2) may be disposed on the encapsulation layer (ENC). The second buffer film (BF2) may include at least one inorganic film. For example, the second buffer film (BF2) may be formed as a multi-film in which one or more inorganic films of a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, and an aluminum oxide layer are alternately laminated. The second buffer film (BF2) may be omitted.

[0132] The first connecting portions (BE1) may be disposed on the second buffer film (BF2). The first connecting portions (BE1) may be formed as a single layer of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), or may be formed as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, or a stacked structure of an APC alloy and ITO (ITO / APC / ITO).

[0133] A first sensor insulating film (TINS1) may be disposed on the first connecting portions (BE1). The first sensor insulating film (TINS1) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0134] Sensor electrodes, i.e., driving electrodes (TEs) and sensing electrodes (REs), may be disposed on a first sensor insulating film (TNIS1). In addition, dummy patterns may be disposed on the first sensor insulating film (TNIS1). The driving electrodes (TEs), sensing electrodes (REs), and dummy patterns do not overlap with the light-emitting areas (EA). The driving electrodes (TEs), sensing electrodes (REs), and dummy patterns may be formed as a single layer of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), or as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, and a stacked structure of an APC alloy and ITO (ITO / APC / ITO).

[0135] A second sensor insulating film (TINS2) may be disposed on the driving electrodes (TE), the sensing electrodes (RE), and the dummy patterns. The second sensor insulating film (TINS2) may include at least one of an inorganic film and an organic film. The inorganic film may be a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The organic film may be an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0136] Fig. 5b is a cross-sectional view showing another example of a light source panel according to one embodiment. Fig. 5c is a cross-sectional view showing a light emitting diode element of the light source panel of Fig. 5b.

[0137] Referring to FIGS. 5b and 5c, a light source panel (100) according to one embodiment may be an inorganic light emitting diode display panel having an inorganic light emitting layer (LE_1) and an inorganic light emitting diode element (LEL_1) extending in a first direction (DR1). The light emitting diode element (LEL_1) may have a length or size in micrometers and may be a micro light emitting diode made of an inorganic material. In this case, the light source panel (100) according to one embodiment may be a micro light emitting diode display panel.

[0138] The light source panel (100) according to one embodiment includes a light emitting diode element (LEL_1) made of an inorganic material, and therefore does not require a sealing structure. Therefore, the light source panel (100) according to one embodiment may not include an encapsulating layer (ENC).

[0139] Additionally, when the light emitting diode element (LEL_1) of the light source panel (100) according to one embodiment emits the same light, it may include a color control layer (CCL). When the light emitting diode element (LEL_1) of the light source panel (100) according to one embodiment is divided into elements that emit multiple colors, the color control layer (CCL) may be omitted.

[0140] Furthermore, in Fig. 5b, the sensor electrode layer (SENL) is omitted for convenience of explanation.

[0141] The light source panel (100) may include a base member (BS) and a display layer (DISL). The display layer (DISL) may include a thin film transistor layer (TFTL), an emission layer (EML), and a color control layer (CCL).

[0142] The base member (BS) and the thin film transistor layer (TFTL) illustrated in FIG. 5b are substantially the same as the base member (BS) and the thin film transistor layer (TFTL) described with reference to FIG. 5a, and therefore, the description of the base member (BS) and the thin film transistor (TFTL) is omitted in FIG. 5b.

[0143] The light emitting element layer (EML) may include light emitting diode elements (LEL_1), a bank (PDL), a third organic film (PVX3), and a fourth organic film (PVX4).

[0144] Each of the light emitting diode elements (LEL_1) may include a pixel electrode (AE_1), a light emitting layer (LE_1), and a common electrode (CE_1). Each of the plurality of light emitting diode elements (LEL_1) is exemplified as a vertical micro LED extending in a first direction (DR1). In this case, each of the plurality of light emitting diode elements (LEL_1) may have a rectangular or reverse taper cross-sectional shape. However, each of the plurality of light emitting diode elements (LEL_1) is not limited to being a vertical micro LED, and may be a flip-type micro LED.

[0145] Each of the plurality of light-emitting diode elements (LEL_1) may be formed of an inorganic material such as GaN. Each of the plurality of light-emitting diode elements (LEL_1) may have a length of several to several hundred μm. For example, each of the plurality of light-emitting diode elements (LEL_1) may have a length of approximately 100 μm or less.

[0146] The light emitting diode element (LEL_1) may have a length or size in micrometers and may be an inorganic light emitting diode made of an inorganic material. The light emitting diode element (LEL_1) may have a shape extending in one direction. Each of the plurality of light emitting diode elements (LEL_1) may have a shape such as a cylinder, a rod, a wire, a tube, etc. However, the shape of the light emitting diode element (LEL_1) is not limited thereto, and may have a shape of a polygonal column such as a cube, a rectangular parallelepiped, a hexagonal column, or a shape extending in one direction but having an outer surface partially inclined.

[0147] Since the pixel electrode (AE_1) is substantially the same as the pixel electrode (AE) described in conjunction with FIG. 5a, the description of the pixel electrode (AE_1) is omitted in FIG. 5b.

[0148] The bank (PDL) may be arranged to cover the edge of the pixel electrode (AE_1). The bank (PDL) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin. The bank (PDL) may include a light-blocking material to prevent light from a light-emitting diode element (LEL_1) of a sub-pixel from propagating to an adjacent sub-pixel. For example, the bank (PDL) may include an inorganic black pigment such as carbon black or an organic black pigment.

[0149] Each of the plurality of light-emitting layers (LE_1) can be arranged on a pixel electrode (AE_1) that is exposed and not covered by a bank (PDL).

[0150] Each of the light-emitting layers (LE_1) of the light-emitting diode element (LEL_1) can be grown and formed on a semiconductor substrate such as a silicon wafer. Each of the light-emitting layers (LE_1) of the light-emitting diode element (LEL_1) can be transferred directly from the silicon wafer onto the pixel electrode (AE_1). Alternatively, each of the light-emitting layers (LE_1) of the light-emitting diode element (LEL_1) can be transferred onto the pixel electrode (AE_1) by an electrostatic method using an electrostatic head or a stamp method using an elastic polymer material such as PDMS or silicon as a transfer substrate.

[0151] The light-emitting layer (LE_1) of the light-emitting diode elements (LEL_1) may include a contact electrode (CTE), a first semiconductor layer (SEM1), an electron blocking layer (EBL), an active layer (MQW), a superlattice layer (SLT), and a second semiconductor layer (SEM2), as shown in FIG. 5c.

[0152] The contact electrode (CTE) may be disposed on the pixel electrode (AE_1). The contact electrode (CTE) and the pixel electrode (AE_1) may be melt-bonded by heat and pressure. Alternatively, the contact electrode (CTE) and the pixel electrode (AE_1) may be bonded to each other through a conductive adhesive such as an anisotropic conductive film or an anisotropic conductive adhesive. Alternatively, the contact electrode (CTE) and the pixel electrode (AE_1) may be bonded to each other through a soldering process. For example, the contact electrode (CTE) may include at least one of gold (Au), copper (Cu), aluminum (Al), and tin (Sn).

[0153] The first semiconductor layer (SEM1) may be disposed on the contact electrode (CTE). The first semiconductor layer (SEM1) may be formed of GaN doped with a p-type conductive dopant such as Mg, Zn, Ca, Se, or Ba.

[0154] An electron blocking layer (EBL) may be disposed on the first semiconductor layer (SEM1). The electron blocking layer (EBL) may be a layer that suppresses or prevents excessive electrons from flowing into the active layer (MQW). For example, the electron blocking layer (EBL) may be p-AlGaN doped with p-type magnesium. The electron blocking layer (EBL) may be omitted.

[0155] The active layer (MQW) can be disposed on the electron blocking layer (EBL). The active layer (MQW) can emit light by the combination of electron-hole pairs in response to an electric signal applied through the first semiconductor layer (SEM1) and the second semiconductor layer (SEM2).

[0156] The active layer (MQW) may include a material having a single or multiple quantum well structure. When the active layer (MQW) includes a material having a multiple quantum well structure, it may have a structure in which a plurality of well layers and barrier layers are alternately stacked. In this case, the well layers may be formed of InGaN, and the barrier layer may be formed of GaN or AlGaN, but is not limited thereto. Alternatively, the active layer (MQW) may have a structure in which a semiconductor material having a large band gap energy and a semiconductor material having a small band gap energy are alternately stacked, or may include different group III to group V semiconductor materials depending on the wavelength of the emitted light.

[0157] When the active layer (MQW) includes InGaN, the color of the emitted light may vary depending on the content of indium (In). For example, as the content of indium (In) increases, the wavelength band of the light emitted by the active layer may shift toward a red wavelength band, and as the content of indium (In) decreases, the wavelength band of the light emitted by the active layer may shift toward a blue wavelength band. For example, the content of indium (In) in the active layer (MQW) of the light-emitting diode element (LEL_1) that emits light in a blue wavelength band may be approximately 10 wt% to 20 wt%.

[0158] A superlattice layer (SLT) may be disposed on the active layer (MQW). The superlattice layer (SLT) may be a layer for relieving stress between the second semiconductor layer (SEM2) and the active layer (MQW). For example, the superlattice layer (SLT) may be formed of InGaN or GaN. The superlattice layer (SLT) may be omitted.

[0159] The second semiconductor layer (SEM2) may be disposed on the superlattice layer (SLT). The second semiconductor layer (SEM2) may be doped with a second conductivity type dopant, such as Si, Ge, Sn, etc. For example, the second semiconductor layer (SEM2) may be n-GaN doped with n-type Si.

[0160] A third organic film (PVX3) may be disposed on the pixel electrode (AE_1) that is not covered by the bank (PDL) and the plurality of light-emitting diode elements (LEL_1). The third organic film (PVX3) may be disposed to cover a side surface and a portion of an upper surface of the bank (PDL). The height of the third organic film (PVX3) may be greater than the height of the bank (PDL). The third organic film (PVX3) may be disposed on a portion of a side surface of each of the plurality of light-emitting diode elements (LEL_1). The height of the third organic film (PVX3) may be less than the height of each of the plurality of light-emitting diode elements (LEL_1). The third organic film (PVX3) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0161] The fourth organic film (PVX4) may be disposed on the third organic film (PVX3). The fourth organic film (PVX4) may be disposed on a portion of a side surface of each of the plurality of light-emitting diode elements (LEL_1). The sum of the height of the third organic film (PVX3) and the height of the fourth organic film (PVX4) may be smaller than the height of each of the plurality of light-emitting diode elements (LEL_1). The fourth organic film (PVX4) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.

[0162] The third organic film (PVX3) and the fourth organic film (PVX4) are layers for leveling the steps caused by the plurality of light-emitting diode elements (LEL_1). If the height of each of the plurality of light-emitting diode elements (LEL_1) is similar to the height of the third organic film (PVX3), the fourth organic film (PVX4) may be omitted.

[0163] The common electrode (CE_1) may be disposed on the upper surface of each of the light-emitting layers (LE_1) and the upper surface of the fourth organic film (PVX4). The common electrode (CE_1) may be disposed on the bank (PDL) that is exposed and not covered by the third organic film (PVX3) and the fourth organic film (PVX4). The common electrode (CE_1) may be a common layer formed commonly on the first sub-pixel, the second sub-pixel, and the third sub-pixel. The common electrode (CE_1) may be made of a transparent conductive material (TCO, Transparent Conductive Material), such as ITO (Indium Tin Oxide) and IZO (Indium Zinc Oxide), which can transmit light.

[0164] The color control layer (CCL) may include a first capping layer (CAP1), a light-shielding layer (BM), a first light conversion layer (QDL1), a second light conversion layer (QDL2), a light-transmitting layer (TPL), a second capping layer (CAP2), a fifth organic film (PVX5), a plurality of color filters (CF1, CF2, CF3), and a sixth organic film (PVX6).

[0165] The first capping layer (CAP1) may be disposed on the common electrode (CE_1). The first capping layer (CAP1) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0166] A light-shielding layer (BM), a first light conversion layer (QDL1), a second light conversion layer (QDL2), and a light-transmitting layer (TPL) may be disposed on a first capping layer (CAP1). The first light conversion layer (QDL1), the second light conversion layer (QDL2), and the light-transmitting layer (TPL) may be formed by the partitioning of the light-shielding layer (BM). Therefore, in a first sub-pixel that outputs a first light, a first light conversion layer (QDL1) may be disposed on the first capping layer (CAP1), in a second sub-pixel that outputs a second light, a second light conversion layer (QDL2) may be disposed on the first capping layer (CAP1), and in a third sub-pixel that outputs a third light, a light-transmitting layer (TPL) may be disposed on the first capping layer (CAP1). The shading layer (BM) overlaps the bank (PDL) in the first direction (DR1) and may not overlap the plurality of light-emitting diode elements (LEL_1).

[0167] The first light conversion layer (QDL1) can convert a portion of the light in the blue wavelength band incident from the light emitting diode element (LEL_1) into light in the red wavelength band. The first light conversion layer (QDL1) can include a first base resin (BRS1) and a first wavelength conversion particle (WCP1). The first base resin (BRS1) can include a light-transmitting organic material. For example, the first base resin (BRS1) can include an epoxy-based resin, an acrylic resin, a cardo-based resin, or an imide-based resin. The first wavelength conversion particle (WCP1) can convert a portion of the light in the blue wavelength band incident from the light emitting diode element (LEL_1) into light in the red wavelength band. The first wavelength conversion particle (WCP1) can be a quantum dot (QD), a quantum rod, a fluorescent material, or a phosphorescent material.

[0168] The second light conversion layer (QDL2) can convert a portion of the light in the blue wavelength band incident from the light emitting diode element (LEL_1) into light in the green wavelength band. It can include a second base resin (BRS2) and a second wavelength conversion particle (WCP2). The second base resin (BRS2) can include a light-transmitting organic material. For example, the second base resin (BRS5) can include an epoxy-based resin, an acrylic resin, a cardo-based resin, or an imide-based resin. The second wavelength conversion particle (WCP2) can convert a portion of the light in the blue wavelength band incident from the light emitting diode element (LEL_1) into light in the green wavelength band. The second wavelength conversion particle (WCP2) can be a quantum dot (QD), a quantum rod, a fluorescent material, or a phosphorescent material.

[0169] The light transmitting layer (TPL) may include a light transmitting organic material. For example, the light transmitting layer (TPL) may include an epoxy resin, an acrylic resin, a cardo resin, or an imide resin.

[0170] The light-blocking layer (BM) may include a first light-blocking layer (BM1) and a second light-blocking layer (BM2) that are sequentially laminated. The first light-blocking layer (BM1) and the second light-blocking layer (BM2) may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin. The first light-blocking layer (BM1) and the second light-blocking layer (BM2) may include a light-blocking material to prevent light from a light-emitting diode element (LEL_1) of a sub-pixel from propagating to an adjacent sub-pixel. For example, the first light-blocking layer (BM1) and the second light-blocking layer (BM2) may include an inorganic black pigment such as carbon black or an organic black pigment.

[0171] A second capping layer (CAP2) may be disposed on the light-shielding layer (BM), the first light conversion layer (QDL1), the second light conversion layer (QDL2), and the light-transmitting layer (TPL). The second capping layer (CAP2) may be formed of an inorganic film, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer. The light-shielding layer (BM), the first light conversion layer (QDL1), the second light conversion layer (QDL2), and the light-transmitting layer (TPL) may be encapsulated by the first capping layer (CAP1) and the second capping layer (CAP2).

[0172] A fifth organic film (PVX5) may be disposed on the second capping layer (CAP2). The fifth organic film (PVX5) may be formed of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, or the like.

[0173] A plurality of color filters (CF1, CF2, CF3) may be arranged on the fifth organic film (PVX5). The plurality of color filters (CF1, CF2, CF3) may include first color filters (CF1), second color filters (CF2), and third color filters (CF3).

[0174] Each of the first color filters (CF1) arranged in the first sub-pixel can transmit light in the red wavelength band and absorb or block light in the blue wavelength band. Therefore, each of the first color filters (CF1) can transmit light in the red wavelength band converted by the first light conversion layer (QDL1) among the light in the blue wavelength band emitted from the light emitting diode element (LEL_1), and absorb or block light in the blue wavelength band that is not converted by the first light conversion layer (QDL1). Therefore, the first sub-pixel can emit light in the red wavelength band.

[0175] Each of the second color filters (CF2) arranged in the second sub-pixel can transmit light in the green wavelength band and absorb or block light in the blue wavelength band. Therefore, each of the second color filters (CF2) can transmit light in the green wavelength band converted by the first light conversion layer (QDL1) among the light in the blue wavelength band emitted from the light emitting diode element (LEL_1), and absorb or block light in the blue wavelength band that is not converted by the first light conversion layer (QDL1). Therefore, the second sub-pixel can emit light in the green wavelength band.

[0176] Each of the third color filters (CF3) arranged in the third sub-pixel can transmit light in the blue wavelength band. Therefore, each of the third color filters (CF3) can transmit light in the blue wavelength band emitted from the light-emitting diode element (LEL_1) passing through the light-transmitting layer (TPL). Therefore, the third sub-pixel can emit light in the blue wavelength band.

[0177] A sixth organic film (PVX6) for planarization may be disposed on a plurality of color filters (CF1, CF2, CF3). The sixth organic film (PVX6) may be formed of an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, or the like.

[0178] FIG. 5d is a cross-sectional view showing another example of a light source panel according to one embodiment.

[0179] Referring to FIG. 5D, a light source panel (100) according to one embodiment may be an inorganic light emitting diode display panel having an inorganic light emitting layer (LE_2) and an inorganic light emitting diode element (LEL_2) extending in a horizontal direction perpendicular to the first direction (DR1). The light emitting diode element (LEL_2) may have a length or size in nanometers and may be a nano light emitting diode made of an inorganic material. In this case, the light source panel (100) according to one embodiment may be a nano light emitting diode display panel.

[0180] Since the light source panel (100) according to one embodiment includes a light emitting diode element (LEL_2) made of an inorganic material, an encapsulation structure is not required. Therefore, the light source panel (100) according to one embodiment may not include an encapsulation layer (ENC).

[0181] In addition, when the light emitting diode element (LEL_2) of the light source panel (100) according to one embodiment emits the same light, the color control layer (CCL) (see FIG. 5b) illustrated in FIG. 5b may be included. In FIG. 5d, for convenience of explanation, the color control layer (CCL) is omitted. In addition, when the light emitting diode element (LEL_2) of the light source panel (100) according to one embodiment is divided into elements that emit a plurality of colors, the color control layer (CCL) may be omitted.

[0182] Furthermore, in Fig. 5d, the sensor electrode layer (SENL) is omitted for convenience of explanation.

[0183] The light source panel (100) may include a base member (BS) and a display layer (DISL). The display layer (DISL) may include a thin film transistor layer (TFTL) and a light emitting element layer (EML).

[0184] The thin film transistor layer (TFTL) illustrated in FIG. 5d will be described mainly based on differences from the thin film transistor layer (TFTL) illustrated in FIG. 5a, and duplicate descriptions will be omitted.

[0185] In Fig. 5d, the second gate metal layer, the second interlayer insulating film (ILD2) (see Fig. 5a), the second data metal layer, and the second organic film (PVX2) (see Fig. 5a) are omitted. In addition, in Fig. 5d, the capacitor (Cst) (see Fig. 5a) is omitted for convenience of explanation.

[0186] As illustrated in FIG. 5D, a first data metal layer including a first connection electrode (CE1), a second connection electrode (CE2_1), and a third connection electrode (CE3) may be disposed on a first interlayer insulating film (ILD1). The first connection electrode (CE1) may be connected to a drain region (TD) through a first contact hole (CT1) penetrating the first interlayer insulating film (ILD1). The second connection electrode (CE2_1) may be connected to a source region (TS) through a second contact hole (CT2_1) penetrating the first interlayer insulating film (ILD1).

[0187] The light emitting element layer (EML) may include first to third bank patterns (BP1, BP2, BP3), an alignment electrode (RME), a contact electrode (CNE), and light emitting diode elements (LEL_2).

[0188] The first bank pattern (BP1) may be arranged between the second bank pattern (BP2) and the third bank pattern (BP3). That is, the second bank pattern (BP2) may be arranged on one side of the first bank pattern (BP1), and the third bank pattern (BP3) may be arranged on the other side of the first bank pattern (BP1).

[0189] A plurality of light emitting diode elements (LEL_2) may be arranged between the first and second bank patterns (BP1, BP2) and between the second and third bank patterns (BP2, BP3). The first to third bank patterns (BP1, BP2, BP3) may be arranged in an island pattern.

[0190] The first to third bank patterns (BP1, BP2, BP3) may be arranged on the first organic film (PVX1). Each of the first to third bank patterns (BP1, BP2, BP3) may protrude in the first direction (DR1) on the first organic film (PVX1). Each of the first to third bank patterns (BP1, BP2, BP3) may have an inclined side surface.

[0191] The first to third alignment electrodes (RME1, RME2, RME3) can be arranged on the first organic film (PVX1) and the first to third bank patterns (BP1, BP2, BP3).

[0192] A first portion of the first alignment electrode (RME1) may be disposed between the second alignment electrode (RME2) and the third alignment electrode (RME3). The first portion of the first alignment electrode (RME1) may cover the upper surface and the inclined side surface of the first bank pattern (BP1). The first portion of the first alignment electrode (RME1) may reflect light emitted from the plurality of light-emitting diode elements (LEL_2) in a first direction (DR1).

[0193] A second portion of the first alignment electrode (RME1) may be disposed on one side of the second alignment electrode (RME2). The second portion of the first alignment electrode (RME1) is connected to the first connection electrode (CE1) through the third contact hole (CT3), thereby being electrically connected to a thin film transistor (TFT).

[0194] Although the first and second portions of the first alignment electrode (RME1) are depicted as being spaced apart in the drawing, in some embodiments, the first and second portions of the first alignment electrode (RME1) may be a single electrode that is electrically connected to each other.

[0195] The second alignment electrode (RME2) may be arranged on one side of the first alignment electrode (RME1). The second alignment electrode (RME2) may cover the upper surface and the inclined side surface of the second bank pattern (BP2). The second alignment electrode (RME2) may reflect light emitted from a plurality of light-emitting diode elements (LEL_2) arranged between the first and second bank patterns (BP1, BP2) in the first direction (DR1).

[0196] The third alignment electrode (RME3) may be arranged on the other side of the first alignment electrode (RME1). The third alignment electrode (RME3) may cover the upper surface and the inclined side surface of the third bank pattern (BP3). The third alignment electrode (RME3) may reflect light emitted from a plurality of light-emitting diode elements (LEL_2) arranged between the second and third bank patterns (BP2, BP3) in the first direction (DR1).

[0197] The third alignment electrode (RME3) can be connected to the third connection electrode (CE3) through the fourth contact hole (CT4). Since the third connection electrode (CE3) is electrically connected to the first power line, the first power voltage of the first power line can be applied to the third connection electrode (CE3).

[0198] The first to third alignment electrodes (RME1, RME2, RME3) are electrically connected to the light emitting diode elements (LEL_2) and can reflect light emitted from the plurality of light emitting diode elements (LEL_2) toward the upper side of the substrate (SUB). To this end, the first to third alignment electrodes (RME1, RME2, RME3) may include a conductive material having a high reflectivity. For example, the first to third alignment electrodes (RME1, RME2, RME3) may include a metal such as silver (Ag), copper (Cu), aluminum (Al), or an alloy including aluminum (Al), nickel (Ni), lanthanum (La), or a structure in which a metal layer such as titanium (Ti), molybdenum (Mo), and niobium (Nb) and the alloy are laminated. In some embodiments, the first to third alignment electrodes (RME1, RME2, RME3) may be formed as a double layer or multilayer in which an alloy including aluminum (Al) and at least one metal layer including titanium (Ti), molybdenum (Mo), and niobium (Nb) are laminated.

[0199] Alternatively, the first to third alignment electrodes (RME1, RME2, RME3) may further include a transparent conductive material. For example, the first to third alignment electrodes (RME1, RME2, RME3) may include a material such as ITO, IZO, ITZO, etc. In some embodiments, each alignment electrode (RME) may have a structure in which a transparent conductive material and a high-reflectivity metal layer are each laminated one or more layers, or may be formed as a single layer including the transparent conductive material and the high-reflectivity metal layer. For example, the first to third alignment electrodes (RME1, RME2, RME3) may have a laminated structure such as ITO / Ag / ITO / , ITO / Ag / IZO, or ITO / Ag / ITZO / IZO.

[0200] Each of the plurality of light-emitting layers (LE_2) may include a contact electrode (CTE), a first semiconductor layer (SEM1), an electron blocking layer (EBL), an active layer (MQW), a superlattice layer (SLT), and a second semiconductor layer (SEM2), as shown in FIG. 5c. Since the description of the contact electrode (CTE), the first semiconductor layer (SEM1), the electron blocking layer (EBL), the active layer (MQW), the superlattice layer (SLT), and the second semiconductor layer (SEM2) of each of the plurality of light-emitting layers (LE_2) is substantially the same as that of FIG. 5c, the description thereof is omitted.

[0201] Each of the plurality of light-emitting layers (LE_2) may be aligned between the first alignment electrode (RME1) and the second alignment electrode (RME2) or between the second alignment electrode (RME2) and the third alignment electrode (RME3). The first insulating film (PAS1) may cover the first to third alignment electrodes (RME1, RME2, RME3). Each of the plurality of light-emitting layers (LE_2) may be insulated from the first to third alignment electrodes (RME1, RME2, RME3) by the first insulating film (PAS1). Each of the first to third alignment electrodes (RME1, RME2, RME3) may receive an alignment signal, thereby forming an electric field between the first to third alignment electrodes (RME1, RME2, RME3). For example, each of the plurality of light-emitting layers (LE_2) can be sprayed onto the first to third alignment electrodes (RME1, RME2, RME3) through an inkjet printing process, and each of the plurality of light-emitting layers (LE_2) dispersed in the ink can be aligned by receiving a dielectrophoresis force by an electric field formed between the first to third alignment electrodes (RME1, RME2, RME3). Accordingly, each of the plurality of light-emitting layers (LE_2) can be aligned in the horizontal direction between the first alignment electrode (RME1) and the second alignment electrode (RME2) and between the second alignment electrode (RME2) and the third alignment electrode (RME3).

[0202] A first insulating film (PAS1) may be disposed on the first organic film (PVX1) and the first to third alignment electrodes (RME1, RME2, RME3). The first insulating film (PAS1) may include an insulating material to protect the first to third alignment electrodes (RME1, RME2, RME3). Since the first insulating film (PAS1) is disposed to cover the first to third alignment electrodes (RME1, RME2, RME3) before the bank layer (BNL) is formed, the first to third alignment electrodes (RME1, RME2, RME3) may be prevented from being damaged during the process of forming the bank layer (BNL). In addition, the first insulating film (PAS1) may also prevent each of the plurality of light-emitting layers (LE_2) from being damaged by direct contact with other members.

[0203] The first to third contact electrodes (CNE1, CNE2, CNE3) may be disposed on the first to third alignment electrodes (RME1, RME2, RME3). The second insulating film (PAS2) may be disposed on the central portion of the bank layer (BNL), the first insulating film (PAS1), and each of the plurality of light-emitting layers (LE_2). The third insulating film (PAS3) may cover the second insulating film (PAS2) and the first to third contact electrodes (CNE1, CNE2, CNE3). The second and third insulating films (PAS2, PAS3) may insulate the first to third contact electrodes (CNE1, CNE2, CNE3), respectively.

[0204] The first contact electrode (CNE1) may be disposed on the first alignment electrode (RME1). Although not shown in the drawing, the first contact electrode (CNE1) may be connected to the first alignment electrode (RME1) through a first contact hole penetrating the first insulating film (PAS1). The first contact electrode (CNE1) may connect one end of the light emitting diode elements (LEL_2) disposed between the first bank pattern (BP1) and the second bank pattern (BP2) and the second alignment electrode (RME2).

[0205] The second contact electrode (CNE2) may be disposed on the first and second alignment electrodes (RME1, RME2) and may be insulated from the first and second alignment electrodes (RME1, RME2). A first portion of the second contact electrode (CNE2) may be disposed on the second alignment electrode (RME2). A second portion of the second contact electrode (CNE2) may be disposed on the first alignment electrode (RME1). The second contact electrode (CNE2) may connect other ends of the light emitting diode elements (LEL_2) disposed between the first bank pattern (BP1) and the second bank pattern (BP2) and one end of the light emitting diode elements (LEL_2) disposed between the first bank pattern (BP1) and the third bank pattern (BP3).

[0206] The third contact electrode (CNE3) may be disposed on the third alignment electrode (RME3). Although not shown in the drawing, the third contact electrode (CNE3) may be connected to the third alignment electrode (RME3) through a second contact hole penetrating the first insulating film (PAS1). The third contact electrode (CNE3) may connect the other end of the light emitting diode elements (LEL_2) disposed between the first bank pattern (BP1) and the third bank pattern (BP3) to the third alignment electrode (RME3).

[0207] As illustrated in FIGS. 5A to 5D , the light source panel (100) according to one embodiment may be an organic light emitting display panel, a micro light emitting diode display panel, or a nano light emitting diode display panel. However, if the light source panel (100) is a display panel including an incoherent light source, it is not limited to the types of display panels described above.

[0208] The light source panel (100) including the aforementioned types of display panels can easily control the intensity of light emitted from each light source pixel (SP) by controlling the intensity of an electric signal applied to each light source pixel (SP). Accordingly, the holographic display (10) according to the present embodiment can easily control the amplitude of light used as a light source.

[0209] Meanwhile, the display panels of the types described above are incoherent light sources, and the light emitted from the display panels of the types described above may be incoherent light. Unlike the holographic displays (10) according to the conventional embodiment that use coherent light to facilitate phase synchronization, the holographic display (10) according to the present embodiment can use an incoherent light source since the phase of light can be adjusted through the spatial light modulator (300) and the holography generating unit (500).

[0210] For example, the lights emitted from each light source pixel (SP) may emit light with different random phases (pseudo random phases). The holography generation unit (500) converts these random phases into digital signals, and the phases of the lights emitted from each light source pixel (SP) can be individually controlled through the spatial light modulator (300). Accordingly, the phases of the lights emitted from each light source pixel (SP) can be synchronized with each other. Alternatively, the holography generation unit (500) may form a hologram pattern by considering the phase difference of each light without phase synchronization, and based on this, the spatial light modulator (300) may individually control the phases of each light to generate a holographic image (HI).

[0211] The holographic display (10) according to the present embodiment can control the amplitude of light using an incoherent light source and can control the phase of light using a spatial light modulator (300) and a holography generating unit (500). That is, the holographic display (10) according to the present embodiment can be a holographic display (10) capable of complex modulation of amplitude and phase.

[0212] FIG. 6 is a plan view showing a spatial light modulator according to one embodiment.

[0213] In addition to FIGS. 3 and 4, referring to FIG. 6, the spatial light modulator (300) may include a display area (DA) and a non-display area (NDA). The display area (DA) and the non-display area (NDA) of the spatial light modulator (300) are substantially the same as the display area (DA) and the non-display area (NDA) of the light source panel (100) described with reference to FIG. 4, respectively, and therefore, a description of the display area (DA) and the non-display area (NDA) of the spatial light modulator (300) will be omitted.

[0214] The display area (DA) of the spatial light modulator (300) may include a plurality of light modulation pixels (MP), a plurality of light modulation power lines (VL_LM) connected to the plurality of light modulation pixels (MP), a plurality of row-axis light modulation data lines (RL), and a plurality of column-axis light modulation data lines (CL).

[0215] Each of the plurality of optical modulation pixels (MP) may be connected to a plurality of optical modulation power lines (VL_LM), a plurality of row-axis optical modulation data lines (RL), and a plurality of column-axis optical modulation data lines (CL). Each of the plurality of optical modulation pixels (MP) may include at least one transistor, an optical modulation element, and a capacitor. In some embodiments, the capacitor may be omitted.

[0216] The row-axis optical modulation data lines (RL) can extend in the X-axis direction and can be spaced apart from each other in the Y-axis direction intersecting the X-axis direction. The row-axis optical modulation data lines (RL) can sequentially supply row-axis optical modulation data signals to a plurality of optical modulation pixels (MP).

[0217] The thermal axis optical modulation data lines (CL) can extend in the Y-axis direction and be spaced apart from each other in the X-axis direction. The thermal axis optical modulation data lines (CL) can supply thermal axis optical modulation data signals to a plurality of optical modulation pixels (MP).

[0218] The optical modulation power line (VL_LM) can extend in the Y-axis direction and be spaced apart from each other in the X-axis direction. The optical modulation power line (VL_LM) can supply a power voltage to a plurality of optical modulation pixels (MP). The power voltage can be at least one of a driving voltage, a high-potential voltage, an initialization voltage, a reference voltage, a bias voltage, and a low-potential voltage.

[0219] The optical modulation timing control unit (310) can receive optical modulation digital data (DATA_LM) and timing signals from the holography generation unit (500). The optical modulation timing control unit (310) can generate a column-axis optical modulation data control signal (CCS) and a row-axis optical modulation data control signal (RCS) based on the timing signals. The optical modulation timing control unit (310) can control the operation timing of the column-axis optical modulation driving unit (320) by supplying the optical modulation digital data (DATA_LM) and the column-axis optical modulation data control signal (CCS) to the column-axis optical modulation driving unit (320). The optical modulation timing control unit (310) can control the operation timing of the row-axis optical modulation driving unit (330) by supplying the optical modulation digital data (DATA_LM) and the row-axis optical modulation data control signal (RCS) to the row-axis optical modulation driving unit (330).

[0220] The column-axis optical modulation driving unit (320) and the row-axis optical modulation driving unit (330) can convert the column-axis optical modulation data control signal (CCS) and the row-axis optical modulation data control signal (RCS) into analog optical modulation data voltages and supply them to the column-axis optical modulation data line (CL) and the row-axis optical modulation data line (RL), respectively.

[0221] The row-axis optical modulation driving unit (330) may be positioned on the left or right side of the non-display area (NDA). The column-axis optical modulation driving unit (320) may be positioned on the upper or lower side of the non-display area (NDA).

[0222] The optical modulation power supply unit (340) can supply power voltage to the spatial light modulator (300), the column-axis optical modulation driving unit (320), and the row-axis optical modulation driving unit (330). The optical modulation power supply unit (340) can generate a driving voltage of the optical modulation element and supply it to a driving voltage line, generate an initialization voltage and supply it to an initialization voltage line, generate a bias voltage and supply it to a bias voltage line, and generate a low-potential voltage and supply it to a low-potential line.

[0223] An optical modulation timing control unit (310), a thermal axis optical modulation driving unit (320), a row axis optical modulation driving unit (330), and an optical modulation power supply unit (340) may be included in the optical modulation driving device.

[0224] A plurality of light modulation pixels (MP) of a spatial light modulator (300) according to the present embodiment can be arranged in a one-to-one correspondence to a plurality of light source pixels (SP) of a light source panel (100). Accordingly, the plurality of light modulation pixels (MP) can individually control the phases of the lights emitted from the plurality of light source pixels (SP).

[0225] The holographic display (10) according to the present embodiment comprises a light modulation driving device including a light modulation timing control unit (310), a column-axis light modulation driving unit (320), a row-axis light modulation driving unit (330), and a light modulation power supply unit (340), separately from a light source driving device including a light source timing control unit (110), a light source display driving unit (120), a light source gate driving unit (130), a light emission control driving unit (140), and a light source power supply unit (150), thereby enabling the light source panel (100) and the spatial light modulator (300) to be driven independently, thereby enabling a fast response speed to be implemented.

[0226] Meanwhile, since the light source timing control unit (110) of the light source panel (100) and the light modulation timing control unit (310) of the spatial light modulator (300) are provided with light source digital data (DATA_LS) and light modulation digital data (DATA_LM) calculated and generated by the holography generation unit (500), respectively, the light source timing control unit (110) and the light modulation timing control unit (310) can be linked and driven by the holography generation unit (500). Accordingly, the timing of the light source panel (100) and the spatial light modulator (300) can be easily synchronized.

[0227] FIG. 7 is a cross-sectional view showing a holographic display according to one embodiment.

[0228] In addition to FIGS. 3 to 5d, referring to FIG. 7, the light source panel (100) may include a light-emitting portion (160) and a first transmission portion (170).

[0229] The light emitting portions (160) may be arranged spaced apart from each other in the second direction (DR2). The light emitting portions (160) may be arranged within the light source pixels (SP). The light emitting portions (160) may be portions where the light emitting diode elements (LEL, LEL_1, LEL_2) described above with reference to FIGS. 5A to 5D are positioned. The light emitting portions (160) may emit light toward the surface where the spatial light modulator (300) is positioned.

[0230] The first transmitting portion (170) may be positioned between the light emitting portion (160) or the light source pixels (SP) and may be arranged alternately with the light emitting portion (160). For example, the first transmitting portion (170) may be positioned between the light source pixels (SP) in the second direction (DR2) and may be arranged alternately with the light source pixels (SP).

[0231] In some embodiments, the first transparent portion (170) may be located in the bank (PDL) or bank layer (BNL) described with reference to FIGS. 5A to 5D. For example, the first transparent portion (170) may be a portion of the bank (PDL) or bank layer (BNL) that does not include a light-blocking material but includes a transparent material.

[0232] The first transmitting portion (170) may include a material having high light transmittance. The light transmittance of the first transmitting portion (170) may be higher than that of the light emitting portion (160) or the light source pixel (SP). A metal layer having high reflectivity or an insulating film containing a light-blocking material may not be disposed on the first transmitting portion (170).

[0233] The array lens (200) may include a lens portion (210) and a second transmission portion (220).

[0234] The lens unit (210) may be spaced apart from each other in the second direction (DR2). The lens unit (210) may overlap the light emitting unit (160) or the light source pixel (SP) in the first direction (DR1). The lens unit (210) may include a condenser lens. The lens unit (210) may condense the light emitted from the light emitting unit (160) onto the reflector (360) of the spatial light modulator (300).

[0235] The second transmission portion (220) may be positioned between the lens portions (210) and may be arranged alternately with the lens portions (210). For example, the second transmission portion (220) may be positioned between the lens portions (210) in the second direction (DR2) and may be arranged alternately with the lens portions (210).

[0236] The spatial light modulator (300) may include a reflector (360) and a light-shielding portion (370).

[0237] The reflective portions (360) may be spaced apart from each other in the second direction (DR2). The reflective portions (360) may correspond one-to-one with the light-emitting portions (160). The reflective portions (360) may reflect the light emitted from the light-emitting portions (160). The reflective portions (360) may adjust the phase of the light emitted from the light-emitting portions (160). For example, the phase of the light reflected from the reflective portions (360) may be adjusted simultaneously with the reflection.

[0238] The shading portion (370) may be positioned between the reflecting portions (360) and may be arranged alternately with the reflecting portions (360). For example, the shading portion (370) may be positioned between the reflecting portions (260) in the second direction (DR2) and may be arranged alternately with the reflecting portions (360).

[0239] The shading portion (370) may have low light transmittance. The shading portion (370) may absorb or block light. For example, the shading portion (370) may absorb or block light emitted from the light emitting portion (160) that is not focused on the reflecting portion (360). Accordingly, the image may be prevented from being disturbed by light other than light reflected from the reflecting portion (360).

[0240] The distance (D_SP) between light source pixels (SP) may be greater than the width (W_SP) of the light source pixels (SP), and the distance (D_MP) between light modulation pixels (MP) may be greater than the width (W_MP) of the light modulation pixels (MP). In some embodiments, the distance (D_SP) between light source pixels (SP) and the distance (D_MP) between light modulation pixels (MP) may each be approximately 2 μm or less. In the present specification, the distance (D_SP) between light source pixels (SP) and the distance (D_MP) between light modulation pixels (MP) may each mean the distance between the center points of the light source pixels (SP) or the distance between the center points of the light modulation pixels (MP). In some embodiments, the distance (D_SP) between light source pixels (SP) and the distance (D_MP) between light modulation pixels (MP) may be equal to each other, but are not limited thereto.

[0241] The light source pixel (SP) and the light modulation pixel (MP) may be arranged to be staggered in the second direction (DR2). For example, the central axes of the light source pixel (SP) and the light modulation pixel (MP), which respectively extend in the first direction (DR1), may be arranged to be staggered in the second direction (DR2). That is, the central axes of the light source pixel (SP) and the light modulation pixel (MP), which respectively extend in the first direction (DR1), may not overlap each other in the first direction (DR1). Accordingly, the light reflected from the reflective portion (360) is prevented from being incident on the light emitting portion (160) or the light source pixel (SP) again, and may be easily incident on the first transmitting portion (170) and the second transmitting portion (220). For example, since the light source pixel (SP) and the light modulation pixel (MP) are arranged in a staggered manner in the second direction (DR2), light reflected from the reflective portion (360) can be reflected at a first angle (θ1) greater than 0, so that it can easily be incident on the first transmission portion (170) and the second transmission portion (220) without being incident on the light emitting portion (160) or the light source pixel (SP) again.

[0242] The first angle (θ1) may be the angle formed by the normal line perpendicular to the upper surface of the reflector (360) and the reflected light. In one embodiment, the first angle (θ1) may be approximately greater than 0 degrees and less than 90 degrees.

[0243] In some embodiments, a first distance (D1) at which a light source pixel (SP) and a light modulation pixel (MP) are staggered in a second direction (DR2) may be less than or equal to half the distance (D_SP) between the light source pixels (SP). Accordingly, light emitted from an adjacent light source pixel (SP) that is not a one-to-one corresponding light source pixel (SP) and light modulation pixel (MP) can be prevented from being incident on the light modulation pixel (MP).

[0244] Below, other embodiments of a holographic display according to one embodiment are described. In the following embodiments, the same components as in the previously described embodiments are referred to by the same reference numerals, and redundant descriptions are omitted or simplified, with the differences being primarily described.

[0245] FIG. 8 is a cross-sectional view showing a holographic display according to another embodiment.

[0246] Referring to FIG. 8, the holographic display (10) according to the present embodiment is different from the holographic display (10) according to the embodiment described with reference to FIG. 7, etc. in that the reflective portion (360) is tilted.

[0247] More specifically, the reflector (360) may extend in a third direction (DR3) that is different from the first direction (DR1) and the second direction (DR2). The reflector (360) may be disposed to be inclined in the third direction (DR3). The reflector (360) may be tilted in the third direction (DR3). For example, the reflector (360) may be inclined at a second angle (θ2). The second angle (θ2) may be an angle formed by an extension direction of the spatial light modulator (300) (e.g., the second direction (DR2)) and an extension direction of the reflector (360). The second angle (θ2) may be approximately greater than 0 and less than 90 degrees.

[0248] In the illustrated drawing, the third direction (DR3) may be a diagonal direction inclined between the first direction (DR1) and the second direction (DR2).

[0249] In the holographic display (10) according to the present embodiment, as the reflector (360) is tilted and arranged, light reflected from the reflector (360) can be reflected at a third angle (θ3). The third angle (θ3) may be an angle formed by a normal line perpendicular to the upper surface of the reflector (360) and the reflected light. The third angle (θ3) may be smaller than the first angle (θ1) described with reference to FIG. 7. Accordingly, the angle of the light reflected from the reflector (360) with respect to the front direction toward the user (PS) can be minimized. That is, the light reflected from the reflector (360) can be emitted in the front direction. Accordingly, the luminance with respect to the front direction can be improved.

[0250] FIG. 9 is a cross-sectional view showing a holographic display according to another embodiment.

[0251] Referring to FIG. 9, the holographic display (10) according to the present embodiment is different from the holographic display (10) according to the other embodiment described with reference to FIG. 8 in that the light modulation pixels (MP) are arranged parallel to the light source pixels (SP).

[0252] More specifically, the light modulation pixel (MP) can overlap the light source pixel (SP) in the first direction (DR1). The light modulation pixel (MP) can be arranged in parallel on the same line as the light source pixel (SP) in the first direction (DR1). For example, one end (MPa) of the light modulation pixel (MP) in the second direction (DR2) can be positioned on the same line as one end (SPa) of the light source pixel (SP) in the second direction (DR2) in the first direction (DR1).

[0253] Accordingly, the reflective portion (360) can overlap with the light-emitting portion (160) in the first direction (DR1). The reflective portion (360) can be arranged parallel to the light-emitting portion (160) on the same line in the first direction (DR1).

[0254] The reflector (360) may extend in a fourth direction (DR4) that is different from the first direction (DR1) and the second direction (DR2). The reflector (360) may be disposed to be inclined in the fourth direction (DR4). The reflector (360) may be tilted in the fourth direction (DR4). For example, the reflector (360) may be inclined at a fourth angle (θ4). The fourth angle (θ4) may be an angle formed by an extension direction of the spatial light modulator (300) (e.g., the second direction (DR2)) and an extension direction of the reflector (360). The fourth angle (θ4) may be approximately greater than 0 and less than 90 degrees.

[0255] In the illustrated drawing, the fourth direction (DR4) may be a diagonal direction inclined between the opposite direction of the first direction (DR1) and the second direction (DR2).

[0256] As the reflector (360) is tilted and positioned, light reflected from the reflector (360) can be reflected at a fifth angle (θ5) greater than 0. The fifth angle (θ5) can be the angle formed by the reflected light and the normal line perpendicular to the upper surface of the reflector (360).

[0257] The holographic display (10) according to the present embodiment can prevent light reflected from the reflective portion (360) from being incident again on the light emitting portion (160) or the light source pixel (SP) by tilting the reflective portion (360) even when the reflective portion (360) and the light emitting portion (160) are arranged side by side in the first direction (DR1). Accordingly, the light reflected from the reflective portion (360) can easily be incident on the first transmitting portion (170) and the second transmitting portion (220).

[0258] FIG. 10 is a cross-sectional view showing a holographic display according to another embodiment.

[0259] Referring to FIG. 10, the holographic display (10) according to the present embodiment is different from the holographic display (10) according to the embodiments described above with reference to FIGS. 7 to 9, etc., in that the shape of the lens unit (210) is different.

[0260] More specifically, the shape of the lens unit (210) may be an asymmetrical shape. For example, the convex end (210a) of the lens unit (210) may be arranged to be biased toward the reflector (360) corresponding one-to-one with the lens unit (210) in the second direction (DR2). The convex end (210a) of the lens unit (210) may be arranged to be biased in the second direction (DR2) by a second distance (D2) from the center of the light emitting unit (160) or the light source pixel (SP). Accordingly, the concentration of light incident from the light emitting unit (160) to the reflector (360) through the lens unit (210) and the accuracy of the light entering the reflector (360) may be improved.

[0261] Meanwhile, the lens unit (210) may have multiple curvatures and refractive indices. For example, the curvatures and refractive indices may be different in several areas of the lens unit (210). Accordingly, the incidence and reflection angles of the light incident on the reflector (360) may be formed in various ways, thereby improving the difference in brightness according to the viewing angle in the front direction toward the user (PS).

[0262] Fig. 11 is a cross-sectional view showing a holographic display according to another embodiment.

[0263] Referring to FIG. 11, the holographic display (10) according to the present embodiment is different from the holographic display (10) according to the embodiment described with reference to FIG. 3, etc. in that it is a curved display.

[0264] More specifically, the holographic display (10) may be a curved display. For example, the light source panel (100), array lens (200), spatial light modulator (300), and optical member (400) of the holographic display (10) may be curved members.

[0265] In the drawing, the holographic display (10) is depicted as having a convex shape in a direction toward the user (PS) (e.g., the first direction (DR1)), but is not limited thereto. For example, the holographic display (10) may also have a convex shape in a direction opposite to the direction toward the user (PS) (e.g., the first direction (DR1)).

[0266] As the holographic display (10) includes a curved shape, the user's (PS) sense of immersion can be improved.

[0267] Although embodiments of the present invention have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

Claims

1. A light source panel comprising a first side and a second side positioned on opposite sides and a plurality of light source pixels spaced apart from each other; A spatial light modulator is disposed on the first surface of the light source panel and includes a plurality of light modulation pixels spaced apart from each other, The plurality of light source pixels and the plurality of light modulation pixels correspond one-to-one to each other, The above light source panel is a holographic display including an incoherent light source.

2. In paragraph 1, Further comprising an array lens interposed between the light source panel and the spatial light modulator, The above array lens is a holographic display including a plurality of lens sections corresponding one-to-one to the plurality of light source pixels.

3. In paragraph 2, A holographic display in which the plurality of lens sections are configured to focus light emitted from the plurality of light source pixels onto the plurality of light modulation pixels, respectively.

4. In paragraph 1, Further comprising a holography generation unit configured to generate a hologram pattern based on phase information of lights emitted from the plurality of light source pixels, The above holographic generation unit is configured to provide the holographic pattern to the spatial light modulator, A holographic display in which the spatial light modulator is configured to control the phase of the lights emitted from the plurality of light source pixels using the holographic pattern.

5. In paragraph 4, The lights emitted from the plurality of light source pixels have random phases that are the same or different from each other, A holographic display configured to synchronize the phases of the lights by calculating the difference in the random phases of the lights.

6. In paragraph 4, The lights emitted from the plurality of light source pixels have random phases that are the same or different from each other, The above holographic generation unit is configured to reflect the difference in the random phase of the lights into the hologram pattern and provide it to the spatial light modulator, A holographic display configured to generate a holographic image using the holographic pattern in which the above spatial light modulator reflects the difference in the random phase.

7. In paragraph 1, The above light source panel further includes a light source driving device that drives the plurality of light source pixels, The above spatial light modulator further includes an optical modulation driving device that drives the plurality of optical modulation pixels, A holographic display in which the light source driving device and the light modulation driving device are provided separately.

8. In paragraph 7, The light source driving device includes at least one of a light source timing control unit, a light source display driving unit, a light source gate driving unit, a light emission control driving unit, and a light source power supply unit. The optical modulation driving device is a holographic display including at least one of an optical modulation timing control unit, a column-axis optical modulation driving unit, a row-axis optical modulation driving unit, and an optical modulation power supply unit.

9. In paragraph 1, The above light source panel is configured to control the amplitude of lights emitted from the plurality of light source pixels, A holographic display wherein the spatial light modulator is configured to control the phase of the lights emitted from the plurality of light source pixels.

10. In paragraph 1, The above light source panel and the above spatial light modulator are planar or plate-shaped holographic displays.

11. In paragraph 1, Including an optical member disposed on the second surface of the light source panel, A holographic display wherein the optical member is configured to adjust the size of the image.

12. In paragraph 1, A holographic display wherein the distance between the plurality of light source pixels is 2㎛ or less.

13. In paragraph 1, A holographic display wherein the distance between the plurality of light modulation pixels is 2㎛ or less.

14. In paragraph 1, A holographic display wherein the distance between the plurality of light source pixels is greater than the width of each of the plurality of light source pixels.

15. In paragraph 1, A holographic display wherein the distance between the plurality of light modulation pixels is greater than the width of each of the plurality of light modulation pixels.

16. In paragraph 1, A holographic display in which the plurality of light source pixels and the plurality of light modulation pixels are arranged alternately in the thickness direction.

17. In paragraph 1, The above plurality of light source pixels emit light toward the first surface, A holographic display in which the plurality of light modulation pixels reflect the light emitted from the plurality of light source pixels in the second surface direction.

18. In paragraph 17, A holographic display in which the reflection angle of the light reflected from the plurality of light modulation pixels is greater than 0 and less than 90 degrees.

19. In paragraph 17, The above spatial light modulator is a holographic display that is a reflective spatial light modulator.

20. In paragraph 1, The above light source panel and the above spatial light modulator are curved holographic displays.

21. A light source panel including a plurality of light-emitting portions spaced apart from each other and a first transmitting portion arranged alternately with the plurality of light-emitting portions; A spatial light modulator is disposed on the light source panel and includes a plurality of reflectors spaced apart from each other, The plurality of light-emitting units and the plurality of reflecting units correspond one-to-one to each other, The above light source panel includes an incoherent light source, The light emitted from the plurality of light-emitting portions is configured to be reflected from the reflective portion and pass through the first transmitting portion, A holographic display in which the reflector is configured to control the phase of the light emitted from the light emitting portion.

22. In paragraph 21, The above spatial light modulator further includes a light-shielding portion arranged alternately with the reflecting portion, A holographic display in which the above-mentioned light-shielding portion absorbs or blocks at least a portion of the light emitted from the above-mentioned light-emitting portion.

23. In paragraph 21, Further comprising an array lens interposed between the light source panel and the spatial light modulator, The above array lens includes a lens part corresponding one-to-one to the light emitting part, A holographic display in which the lens portion is configured to focus the light emitted from the light emitting portion onto the reflecting portion.

24. In paragraph 23, The above array lens further includes a second transmitting portion arranged alternately with the lens portion, A holographic display configured so that the light emitted from the light emitting portion passes through the second transmission portion before passing through the first transmission portion after being reflected from the reflection portion.

25. In paragraph 23, A holographic display in which the above lens portion has multiple different refractive indices for each area.

26. In paragraph 21, A holographic display wherein the reflector is configured to be tilted in a direction different from the extension direction of the spatial light modulator.

27. In paragraph 26, A holographic display in which the plurality of light-emitting parts and the plurality of reflecting parts are arranged parallel to each other in the thickness direction.

28. In paragraph 21, A holographic display in which the plurality of light-emitting parts and the plurality of reflecting parts are arranged alternately in the thickness direction.

29. In paragraph 21, The above light source panel and the above spatial light modulator are curved holographic displays.

Images