Holographic display device

Abstract

The invention relates to a holographic display device. The holographic display apparatus includes: at least one spatial light modulator that displays a holographic content image; at least one surface light source device that generates image display light of a first resolution from behind the at least one spatial light modulator and provides the image display light of the first resolution to the spatial light modulator as background light; and at least one image transmission member defining a display path of the holographic content image. At least one spatial light modulator generates a holographic content image of a second resolution by using the image display light of the first resolution as background light, and the at least one image transmission member defines a display path of the holographic content image of the third resolution in which the image display light of the first resolution is mixed with the holographic content image of the second resolution.

Description

Technical Field

[0001] The present disclosure relates to a holographic display device. Background Art

[0002] Recently, with the development of electronic devices and display devices that can realize virtual reality ("VR"), as the next step of virtual reality, technologies that can realize augmented reality ("AR"), mixed reality ("MR") and holographic images are also being studied.

[0003] Unlike virtual reality, which is based on a completely virtual world, augmented reality is a display technology that further increases the effect of reality by superimposing virtual objects or image information on a real-world environment. Stereoscopic imaging technology using a holographic method can fundamentally avoid fatigue that occurs in a conventional stereoscopic method in which binocular parallax is used to view a stereoscopic image. Therefore, stereoscopic imaging technology using a holographic method is attracting much attention as a next-generation stereoscopic imaging technology that should eventually be realized.

[0004] In the case of holographic images, since the actual image is directly seen with the eyes instead of using an optical illusion, a three-dimensional ("3D") effect can be felt as if the real thing is seen. Therefore, holographic images have the advantage of not causing fatigue even if viewed for a long time.

[0005] The digital holography method basically adopts a spatial light modulator, and the performance of the spatial light modulator is an important factor in determining the performance of the holography. Recently, a liquid crystal display panel is used as a spatial light modulator, and the pixel size and pixel interval of the liquid crystal display panel are important factors in determining the size and viewing angle of the holographic image in the holographic display device. Summary of the invention

[0006] Features of the present disclosure provide a holographic display device that is capable of increasing the resolution and three-dimensional ("3D") effect of a holographic image by modulating the resolution and 3D effect of a surface light source device that provides background light to a spatial light modulator.

[0007] Features of the present disclosure also provide a holographic display device that is capable of generating image display light at different steps for each light emitting area of ​​a surface light source device, and providing the image display light at different steps to a spatial light modulator as background light.

[0008] However, the features of the present disclosure are not limited to the features set forth herein. The above and other features of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure pertains by referring to the detailed description of the present disclosure given below.

[0009] In an embodiment of the present disclosure, a holographic display device includes: a spatial light modulator that displays a holographic content image; a surface light source device that generates image display light of a first resolution from behind the spatial light modulator and provides the image display light of the first resolution to the spatial light modulator as background light; and an image transmission component that defines a display path of the holographic content image, wherein the spatial light modulator generates a holographic content image of a second resolution by using the image display light of the first resolution as background light, and the image transmission component defines a display path of a holographic content image of a third resolution in which the image display light of the first resolution and the holographic content image of the second resolution are mixed.

[0010] In an embodiment, a surface light source device includes: an organic light emitting display unit, which generates image display light of a first resolution as a surface light source; a first data processor, which extracts holographic content image data of a first resolution from holographic content image data input from the outside, or converts holographic content image data input from the outside into holographic content image data of the first resolution; and an emission driving circuit, which converts the holographic content image data of the first resolution into an analog image signal, and provides the analog image signal to an organic light emitting pixel of the organic light emitting display unit.

[0011] In an embodiment of the present disclosure, a holographic display device includes: a spatial light modulator that displays a holographic content image; a surface light source device that generates image display light of a first resolution from behind the spatial light modulator and provides the image display light of the first resolution to the spatial light modulator as background light; and an image transmission component that defines a display path of the holographic content image, wherein the spatial light modulator generates a holographic content image of a second resolution by using the image display light of the first resolution as background light, and the image transmission component defines a display path of a holographic content image of a third resolution in which the image display light of the first resolution and the holographic content image of the second resolution are mixed, and wherein the first resolution is a resolution preset to be lower than the second resolution, and the third resolution is a mixture of the first resolution and the second resolution.

[0012] In an embodiment, the surface light source device generates image display light of the first resolution as a surface light source by converting holographic content image data input from the outside into holographic content image data of the first resolution, converting the holographic content image data of the first resolution into an analog image signal, and providing the analog image signal to organic light-emitting pixels of an organic light-emitting display unit.

[0013] The holographic display device in the embodiment of the present disclosure can increase the resolution and 3D effect of the holographic image by modulating the resolution and 3D effect of the surface light source device that provides background light to the spatial light modulator.

[0014] In addition, the holographic display device in the embodiment of the present disclosure can generate image display light at different steps for each light-emitting area of ​​the surface light source device, and provide the image display light at different steps to the spatial light modulator as background light, thereby further improving the 3D effect of the holographic image.

[0015] However, the effects of the present disclosure are not limited to the effects set forth herein. The above and other effects of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure pertains by referring to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] These features and / or other features will become more apparent and easier to understand through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0017] Figure 1 An embodiment using a projector-type holographic display device according to the present disclosure is shown;

[0018] Figure 2 An embodiment using a glasses-type holographic display device according to the present disclosure is shown;

[0019] Figure 3 It is schematically shown Figure 1 or Figure 2 An exploded perspective view of the configuration of the holographic display device shown in ;

[0020] Figure 4 yes Figure 3 A detailed plan view of the surface light source device shown in;

[0021] Figure 5 It is shown Figure 4 A side sectional view of the cross-sectional structure of the surface light source device shown in;

[0022] Figure 6 It is schematically shown Figure 4 and Figure 5 A plan view of the structure of a surface light emitting unit of a surface light source device shown in FIG.

[0023] Fig. 7A yes Figure 3 A detailed plan view of the spatial light modulator shown in FIG. Figure 7B yes Fig. 7A An enlarged view of the dot-dash circle portion;

[0024] Figure 8 It is schematically shown Fig. 7A A plan view of the structure of a liquid crystal image display unit of a spatial light modulator shown in;

[0025] Fig. 9An embodiment of a backlight and backlight display resolution of a surface light source device is shown;

[0026] Fig.10 An embodiment of a display image and image display resolution of a spatial light modulator is shown;

[0027] Fig.11 Embodiments of holographic images and resolutions displayed by a holographic display device are shown;

[0028] Fig.12 An embodiment of a backlight and backlight display resolution of a surface light source device is shown;

[0029] Fig.13 An embodiment of a display image and image display resolution of a spatial light modulator is shown;

[0030] Fig.14 Embodiments of holographic images and resolutions displayed by a holographic display device are shown;

[0031] Fig.15 Shown in Figure 4 and Figure 5 An exemplary arrangement structure of light-emitting pixels in a surface light-emitting unit of a surface light source device shown in FIG.

[0032] Fig.16 is a cross-sectional view showing an embodiment of a stepped structure of a light-emitting pixel in each light-emitting region of a surface light source device;

[0033] Fig.17 is a cross-sectional view showing in detail the cross-sectional structure of a light-emitting pixel formed in a first light-emitting region of a surface light source device;

[0034] Fig.18 is a cross-sectional view showing in detail the cross-sectional structure of a light-emitting pixel formed in the second light-emitting region of the surface light source device;

[0035] Fig.19 is a cross-sectional view showing in detail the cross-sectional structure of a light-emitting pixel formed in a third light-emitting region of the surface light source device;

[0036] Fig. 20 An embodiment of the background light of the first light emitting area and the background light display resolution is shown;

[0037] Fig.21 An embodiment of the background light of the second light emitting area and the background light display resolution is shown;

[0038] Fig. 22 An embodiment of the background light of the third light emitting area and the background light display resolution is shown;

[0039] Fig.23 Embodiments showing displayed images and image display resolution of a spatial light modulator; and

[0040] Fig.24 is a cross-sectional view showing an embodiment of a stepped structure of a light-emitting pixel in each light-emitting region of a surface light source device. DETAILED DESCRIPTION

[0041] The present disclosure will now be described more fully below with reference to the accompanying drawings, in which preferred embodiments of the present disclosure are shown. However, the present disclosure may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art.

[0042] It will also be understood that when a layer is referred to as being 'on' another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Throughout the specification, the same reference numerals refer to the same components.

[0043] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the teachings of the present disclosure, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0044] As used herein, terms such as "part" or "unit" are intended to mean a software component or a hardware component that performs a predetermined function. A hardware component may include, for example, a field programmable gate array ("FPGA") or an application specific integrated circuit ("ASIC"). A software component may refer to executable code in an addressable storage medium and / or data used by the executable code. Thus, a software component may be an object-oriented software component, a class component, and a task component, and may include, for example, a process, a function, a property, a procedure, a subroutine, a program code segment, a driver, firmware, microcode, a circuit, data, a database, a data structure, a table, an array, or a variable.

[0045] Each of the features of the various embodiments of the present disclosure can be combined with each other in part or in whole, and various interlocks and drives are technically possible. Each embodiment can be implemented independently of each other, or can be implemented together in association.

[0046] Hereinafter, illustrative embodiments will be described in detail with reference to the accompanying drawings.

[0047] Figure 1An embodiment utilizing a projector-type holographic display device 200 according to the present disclosure is shown. Figure 2 An embodiment utilizing the glasses-type holographic display device 200 according to the present disclosure is shown.

[0048] refer to Figure 1 and Figure 2 , the holographic display device 200 in the embodiment can be formed as a projector type, which can be easily carried by a user, or can be set (e.g., installed) or assembled into a structure in a predetermined space (such as a ceiling or wall surface).

[0049] In addition, the holographic display device 200 in the embodiment may be integrated with a glasses-type frame, which may be easily carried and worn or removed by a user, or may be set (eg, installed) or assembled in a glasses-type frame.

[0050] The holographic display device 200 displays and provides a holographic content image FH on a predetermined space through a three-dimensional ("3D") lens or sheet so that the holographic content image FH can be recognized in a real space seen by the user's eyes. The holographic content image FH may include a two-dimensional ("2D") or 3D holographic image content, which is a combination of a graphic image, an image taken by a camera, and a text image, and sound content.

[0051] Figure 3 It is schematically shown Figure 1 or Figure 2 0 is an exploded perspective view of the configuration of the holographic display device 200 shown in FIG.

[0052] refer to Figure 3 , the holographic display device 200 includes at least one spatial light modulator 210 , at least one surface light source device 110 , and at least one image transmission member 310 .

[0053] At least one surface light source device 110 is disposed behind the spatial light modulator 210 to provide background light as backlight to a rear surface of the spatial light modulator 210 .

[0054] The surface light source device 110 may include an organic light emitting display device ("OLED"), an inorganic electroluminescent ("EL") display device, a quantum dot light emitting display device ("QED"), a cathode ray tube ("CRT") display device, a micron light emitting diode ("LED") display device, a nano LED display device, or a liquid crystal display ("LCD") device.

[0055] The case where OLED is applied as the surface light source device 110 will be described below as an example. However, the present disclosure is not limited to OLED, and other display devices listed above or known in the art may also be applied within the scope of the shared technical spirit.

[0056] The surface light source device 110 applied as an OLED may be formed to have a resolution different from that of the at least one spatial light modulator 210. Specifically, the surface light source device 110 may be formed to have a lower resolution than that of the at least one spatial light modulator 210.

[0057] The surface light source device 110 receives holographic content image data from the outside and arranges the holographic content image data according to a preset first resolution. Then, the holographic content image data of the first resolution is converted into an analog image signal and displayed on the emission area of ​​the organic light emitting display surface.

[0058] The holographic content image display light of the first resolution displayed on the organic light emitting display surface of the surface light source device 110 (ie, the emission area of ​​the surface light source device 110) is provided to the rear surface of the spatial light modulator 210 as backlight, ie, background light.

[0059] The spatial light modulator 210 generates a holographic content image according to holographic content image data from the outside and provides the holographic content image to the image transmission member 310 in front of the spatial light modulator 210 , thereby displaying the holographic content image in an image display direction and in the space of the image transmission member 310 .

[0060] The spatial light modulator 210 may include an LCD that displays a holographic content image of a second resolution on a front surface through background light of a first resolution provided from a surface light source device 110 disposed at the rear of the spatial light modulator 210 .

[0061] A case where an LCD is applied as the spatial light modulator 210 will be described below as an example. However, the present disclosure is not limited to the LCD, and other display devices listed above or known in the art may also be applied within the scope of the shared technical spirit.

[0062] The spatial light modulator 210 applied as an LCD may be formed to have the same resolution as or a different resolution from that of the at least one surface light source device 110. However, in an embodiment, the spatial light modulator 210 may be formed to have a higher resolution than the at least one surface light source device 110.

[0063] The spatial light modulator 210 receives the holographic content image data input from the outside, and arranges the holographic content image data according to a preset second resolution. Then, the holographic content image data of the second resolution is converted into an analog image signal and displayed on an image display surface on which a plurality of pixels are arranged. The second resolution of the spatial light modulator 210 is set to be different from the first resolution of the surface light source device 110, specifically, to be higher than the first resolution of the surface light source device 110.

[0064] Therefore, the spatial light modulator 210 generates a holographic content image of a second resolution higher than the first resolution through background light of the first resolution provided from at least one surface light source device 110 behind the spatial light modulator 210, and displays the generated holographic content image on its front surface.

[0065] The at least one image transmitting member 310 transmits a holographic contents image FH of a third resolution in which background light of a first resolution and a holographic contents image of a second resolution are mixed through a preset optical path to guide and provide the holographic contents image FH in a preset image display direction.

[0066] Specifically, the image transmission member 310 defines a display path (or optical path) of the holographic contents image FH so that the holographic contents image FH of the third resolution can be displayed on a preset space or display surface.

[0067] The image transmission member 310 may include at least one optical member of an optical waveguide (e.g., a prism), a diffusion lens, and a focusing lens. Therefore, the holographic content image displayed by the at least one spatial light modulator 210 is guided to a predetermined space through at least one of the optical waveguide, the diffusion lens, and the focusing lens, and is recognized as a holographic content image FH of a third resolution in a real space. The holographic content image FH displayed as a holographic type by the image transmission member 310 may include 2D or 3D holographic image content, which is a combination of a graphic image, an image taken by a camera, and a text image, and sound content.

[0068] Figure 4 yes Figure 3 Detailed plan view of the surface light source device 110 shown in FIG.

[0069] refer to Figure 4 , the at least one surface light source device 110 is formed to serve as a light source for providing background light to a rear surface of the at least one spatial light modulator 210 .

[0070] In a plan view, the surface light source device 110 may have a quadrilateral shape, a circular shape, or an elliptical shape such as a rectangular and a square shape. In an embodiment, when the spatial light modulator 210 is formed in a rectangular shape, the surface light source device 110 may have a rectangular shape corresponding to the shape of the spatial light modulator 210, and the long side of the rectangular shape is, for example, arranged in the horizontal direction. However, the present disclosure is not limited to this. The long side may also be arranged in the vertical direction, or the surface light source device 110 may also be rotatably mounted so that its long side may be variably arranged in the horizontal direction or the vertical direction. The surface light source device 110 may also be formed in a circular shape in a plan view together with the spatial light modulator 210.

[0071] refer to Figure 4 , at least one surface light source device 110 includes: a surface light emitting unit (also known as an organic light emitting display unit) DU1, which displays background light as a surface light source; an emission driving circuit 120, which drives the light emitting pixels of the surface light emitting unit DU1; and a first data processor 140, which provides holographic content image data to the emission driving circuit 120.

[0072] Specifically, at least one surface light source device 110 includes a surface light emitting unit DU1 that displays background light as a surface light source. Here, the surface light emitting unit DU1 may include a plurality of light emitting pixels (also referred to as organic light emitting pixels), and the background light as the surface light source may be emitted by the light emitting pixels. The light emitting pixels in the surface light emitting unit DU1 are formed and arranged to correspond to a preset first resolution.

[0073] The first data processor 140 extracts holographic content image data of a first resolution from the holographic content image data input from the outside, or converts the holographic content image data input from the outside into holographic content image data of a preset first resolution, and then transmits the holographic content image data of the first resolution to the emission driving circuit 120 of the surface light source device 110.

[0074] The emission driving circuit 120 of the surface light source device 110 can output data signals and voltages for driving the light-emitting pixels of the surface light-emitting unit DU1. Specifically, the emission driving circuit 120 receives holographic content image data from a first data processor 140 such as a graphic card, and arranges the holographic content image data according to a preset first resolution. Then, the holographic content image data of the first resolution is converted into an analog image signal and provided to the light-emitting pixels arranged on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1.

[0075] Figure 5 It is shown Figure 4 1 is a side sectional view of a sectional structure of a surface light source device 110 shown in FIG.

[0076] refer to Figure 4 and Figure 5 The surface light emitting unit DU1 may be divided into a first main area MA1 and a first sub-area SBA1. The first main area MA1 may include an organic light emitting display surface DA1 on which a plurality of light emitting pixels performing surface emission are arranged, and a first non-display area NDA1 disposed around the organic light emitting display surface DA1.

[0077] The light emitted from the corresponding emission area or opening area of ​​the light-emitting pixel can be displayed on the organic light-emitting display surface DA1 as background light. To this end, the light-emitting pixel of the organic light-emitting display surface DA1 may include a light-emitting pixel circuit having a switching element, a pixel defining layer defining the emission area or the opening area, and a self-luminous element.

[0078] The first non-display area NDA1 may be an area outside the organic light emitting display surface DA1. The first non-display area NDA1 may be defined as an edge area of ​​the first main area MA1. The first non-display area NDA1 may include a first gate driver 111 that provides a gate signal to a gate line and a fan-out line (not shown) that connects the emission driving circuit 120 and the organic light emitting display surface DA1.

[0079] The first sub-area SBA1 may extend from one side of the first main area MA1. The first sub-area SBA1 may include a flexible material that may be bent, folded, or curled. In an embodiment, when the first sub-areas SBA1 are bent, they may overlap, for example, the first main area MA1 in the thickness direction (Z-axis direction). Each of the first sub-areas SBA1 may include an emission drive circuit 120 and a pad unit connected to the first circuit board 130. Alternatively, the first sub-area SBA1 may be omitted, and the emission drive circuit 120 and the pad unit may be disposed in the first non-display area NDA1.

[0080] At least one emission driving circuit 120 may be formed as an integrated circuit and disposed (e.g., mounted) in the first sub-region SBA1 by a chip on glass (“COG”) method, a chip on plastic (“COP”) method, or an ultrasonic bonding method. In an embodiment, the emission driving circuit 120 may be disposed in each of the first sub-regions SBA1 and may overlap with the first main region MA1 in the thickness direction (Z-axis direction) by, for example, bending of the first sub-region SBA1. In another embodiment, the emission driving circuit 120 may be disposed (e.g., mounted) on the first circuit board 130.

[0081] The first circuit board 130 may be attached to the pad unit of the first sub-area SBA1 using an anisotropic conductive film ("ACF"). The leads of the first circuit board 130 may be electrically connected to the pad unit of the first sub-area SBA1. The first circuit board 130 may be a flexible printed circuit board, a printed circuit board, or a flexible film such as a chip on film.

[0082] Figure 5The first substrate SUB1 of the surface light-emitting unit DU1 shown in the figure may be a base substrate or a base member. The first substrate SUB1 may be a flexible substrate that can be bent, folded, or curled. In an embodiment, the first substrate SUB1 may include, for example, a glass material or a metal material. However, the present disclosure is not limited thereto. In another embodiment, the first substrate SUB1 may include a polymer resin such as polyimide ("PI").

[0083] The first thin film transistor layer TFTL1 may be disposed on the first substrate SUB1. The first thin film transistor layer TFTL1 may include a plurality of thin film transistors constituting a light emitting pixel circuit of a light emitting pixel. The first thin film transistor layer TFTL1 may also include a gate line, a data line, a power line, a gate control line, a fan-out line connecting the emission driving circuit 120 and the data line, and a lead connecting the emission driving circuit 120 and the pad unit. When the first gate driver 111 is formed on one side of the first non-display area NDA1 of the surface light emitting unit DU1, it may also include a thin film transistor.

[0084] The first thin film transistor layer TFTL1 may be disposed throughout the organic light emitting display surface DA1, the first non-display area NDA1, and the first sub-area SBA1. The thin film transistors, gate lines, data lines, and power lines of the pixels of the first thin film transistor layer TFTL1 may be disposed on the organic light emitting display surface DA1. The gate control lines and fan-out lines of the first thin film transistor layer TFTL1 may be disposed in the first non-display area NDA1. The leads of the first thin film transistor layer TFTL1 may be disposed in the first sub-area SBA1.

[0085] The light emitting element layer EML1 may be disposed on the first thin film transistor layer TFTL1. The light emitting element layer EML1 may include a plurality of light emitting elements, each of which includes a first electrode, a light emitting layer, and a second electrode sequentially stacked to emit light, and a pixel defining layer defining pixels. The light emitting elements of the light emitting element layer EML1 may be disposed on the organic light emitting display surface DA1.

[0086] The first encapsulation layer TFEL1 may cover the upper surface and the side surface of the light emitting element layer EML1 and may protect the light emitting element layer EML1. The first encapsulation layer TFEL1 may include at least one inorganic layer and at least one organic layer to encapsulate the light emitting element layer EML1.

[0087] Figure 6 It is schematically shown Figure 4 and Figure 5 2 is a plan view of the structure of the surface light emitting unit DU1 of the surface light source device 110 shown in FIG.

[0088] The organic light emitting display surface DA1 is an area that displays background light through surface light emission, and may be defined as a central area of ​​the surface light emitting unit DU1. The organic light emitting display surface DA1 may include a plurality of light emitting pixels OSP, a plurality of gate lines GL, a plurality of data lines DL, and a plurality of power lines VL. Each of the light emitting pixels OSP may be defined as a minimum unit that emits light.

[0089] The gate lines GL may provide the light emitting pixels OSP with gate signals received from the first gate driver 111. The gate lines GL may extend in the X-axis direction and may be spaced apart from each other in the Y-axis direction crossing the X-axis direction.

[0090] The data lines DL may provide the light emitting pixels OSP with image data voltages received from the emission driving circuit 120. The data lines DL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0091] The power lines VL may provide the light-emitting pixels OSP with a power voltage received from the emission driving circuit 120. Here, the power voltage may be at least one of a driving voltage, an initialization voltage, and a reference voltage. The power lines VL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0092] The first non-display area NDA1 may include a first gate driver 111, a fan-out line FOL, and a gate control line GCL. The first gate driver 111 may generate a plurality of gate signals based on a gate control signal, and may sequentially provide the gate signals to the gate lines GL according to a set order.

[0093] The fan-out line FOL may extend from the emission driving circuit 120 to the organic light emitting display surface DA1. The fan-out line FOL may provide a data voltage received from the emission driving circuit 120 to the data line DL.

[0094] The first gate control line GCL1 may extend from the emission driving circuit 120 to the first gate driver 111. The first gate control line GCL1 may provide a gate control signal received from the emission driving circuit 120 to the first gate driver 111.

[0095] The emission driving circuit 120 may output a control signal and a data voltage for driving the light-emitting pixel OSP of the organic light-emitting display surface DA1 to the fan-out line FOL. The emission driving circuit 120 may provide an image data voltage to the data line DL through the fan-out line FOL. The image data voltage may be provided to the light-emitting pixel OSP and may determine the brightness of the light-emitting pixel OSP. The emission driving circuit 120 may provide a gate control signal to the first gate driver 111 through the gate control line GCL.

[0096] Fig. 7A yes Figure 3 A detailed plan view of the spatial light modulator 210 shown in FIG. 1 , and Figure 7B yes Fig. 7A An enlarged view of the dot-dash circle portion.

[0097] refer to Fig. 7A , the spatial light modulator 210 serves as a holographic display device that displays a holographic content image on a front surface using background light provided from the surface light source device 110 disposed at the rear of the spatial light modulator 210 .

[0098] The spatial light modulator 210 may be formed in the same planar shape as the surface light source device 110 that provides background light as backlight, and may have a quadrilateral shape, a circular shape, or an elliptical shape such as a rectangular shape and a square shape in a plan view. In an embodiment, when the surface light source device 110 is formed in a rectangular shape, the spatial light modulator 210 may have a rectangular shape corresponding to the shape of the surface light source device 110, and the rectangular shape has, for example, a long side arranged in the horizontal direction. However, the present disclosure is not limited thereto. The long side may also be arranged in the vertical direction, or the spatial light modulator 210 may also be rotatably mounted so that its long side may be variably arranged in the horizontal direction or in the vertical direction. Similar to the surface light source device 110, the spatial light modulator 210 may also be formed in a circular shape in a plan view.

[0099] refer to Fig. 7A The spatial light modulator 210 includes a liquid crystal image display unit DU2 and a second data processor 240 disposed on a second circuit board 230 .

[0100] The liquid crystal image display unit DU2 displays a holographic content image on the front surface by the background light provided from the surface light source device 110 disposed behind the spatial light modulator 210. The liquid crystal image display unit DU2 includes a plurality of liquid crystal pixels and displays the holographic content image through the liquid crystal pixels. The liquid crystal pixels in the liquid crystal image display unit DU2 are formed and arranged to correspond to a preset second resolution.

[0101] The second data processor 240 provides the holographic content image data to the display driving circuit 220 driving the liquid crystal pixels of the liquid crystal image display unit DU2. In an implementation, the display driving circuit 220 may be disposed in the second sub-area SBA2.

[0102] The second data processor 240 extracts holographic content image data of a second resolution from the holographic content image data input from the outside, or converts the holographic content image data input from the outside into holographic content image data of a preset second resolution, and then transmits the holographic content image data of the second resolution to the display driving circuit 220 of the spatial light modulator 210.

[0103] The display driving circuit 220 of the spatial light modulator 210 can output data signals and voltages for driving the liquid crystal pixels of the liquid crystal image display unit DU2. Specifically, the display driving circuit 220 receives the holographic content image data from the second data processor 240 such as a graphic card, and arranges the holographic content image data according to a preset second resolution. Then, the holographic content image data of the second resolution is converted into an analog image signal and provided to the liquid crystal pixels set on the image display surface DA2 of the liquid crystal image display unit DU2.

[0104] Figure 8 It is schematically shown Fig. 7A 2 is a plan view of the structure of the liquid crystal image display unit DU2 of the spatial light modulator 210 shown in FIG.

[0105] refer to Fig. 7A and Figure 8 , the image display surface DA2 is an image display area for displaying a holographic content image, and may be defined as a central area of ​​the liquid crystal image display unit DU2. The image display surface DA2 may include a plurality of liquid crystal pixels LSP, a plurality of gate lines GL, a plurality of data lines DL, and a plurality of power lines VL. Each of the liquid crystal pixels LSP may be defined as a minimum unit for displaying a holographic content image by passing background light therethrough.

[0106] like Figure 7B As shown in , each of the liquid crystal pixels LSP includes a data line DL, a gate line GL crossing the data line DL, a thin film transistor TFT formed at the intersection of the data line DL and the gate line GL, a pixel electrode connected to the thin film transistor TFT, a liquid crystal cell Clc formed in a region between the pixel electrode and the common electrode, and a storage capacitor Cst formed in parallel with the liquid crystal cell Clc. The liquid crystal cell Clc is driven by a differential voltage between the data voltage of the pixel electrode and a common voltage Vcom of the common electrode and an electric field according to the differential voltage. The liquid crystal cell Clc realizes image display light by diffracting and passing background light through the differential voltage between the data voltage and the common voltage Vcom and the electric field according to the differential voltage. A color filter may be provided in each liquid crystal pixel LSP to display a colored image.

[0107] The gate lines GL may provide the liquid crystal pixels LSP with gate signals received from the second gate driver 221. The gate lines GL may extend in the X-axis direction and may be spaced apart from each other in the Y-axis direction crossing the X-axis direction.

[0108] The data lines DL may provide the liquid crystal pixels LSP with image data voltages received from the display driving circuit 220. The data lines DL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0109] The power line VL may provide a power supply voltage such as a common voltage Vcom received from the display driving circuit 220 to the liquid crystal pixel LSP.

[0110] The second non-display area NDA2 may include a second gate driver 221, fan-out lines FOL, and gate control lines GCL. The second gate driver 221 may generate a plurality of gate signals based on the gate control signal, and may sequentially provide the gate signals to the gate lines GL according to a set order.

[0111] The fan-out line FOL may extend to the image display surface DA2 from the display driving circuit 220. The fan-out line FOL may provide a data voltage received from the display driving circuit 220 to the data line DL.

[0112] The second gate control line GCL2 may extend from the display driving circuit 220 to the second gate driver 221. The second gate control line GCL2 may provide a gate control signal received from the display driving circuit 220 to the second gate driver 221.

[0113] The display driving circuit 220 may output a control signal and an image data voltage for driving the liquid crystal pixel LSP of the image display surface DA2 to the fan-out line FOL. The display driving circuit 220 may provide the image data voltage to the data line DL through the fan-out line FOL. The image data voltage may be provided to the liquid crystal pixel LSP, and the brightness of the liquid crystal pixel LSP may be determined. The display driving circuit 220 may provide a gate control signal to the second gate driver 221 through the gate control line GCL.

[0114] Fig. 9 The backlight of the surface light source device 110 and the backlight display resolution are shown.

[0115] refer to Fig. 9 The first data processor 140 of the surface light source device 110 may convert the holographic content image data input from the outside into holographic content image data of a preset first resolution. Then, the holographic content image data of the first resolution is transmitted to the emission driving circuit 120 of the surface light source device 110.

[0116] The emission driving circuit 120 of the surface light source device 110 receives the holographic content image data of the first resolution from the first data processor 140, and arranges the holographic content image data according to the first resolution. Then, the holographic content image data of the first resolution is converted into an analog image signal and provided to the light-emitting pixels arranged on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1. The image FH(110) according to the first resolution is displayed on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1, and the image display light according to the first resolution is provided to the spatial light modulator 210 as the surface light source and the background light.

[0117] Fig.10 The displayed image and the image display resolution of the spatial light modulator 210 are shown.

[0118] refer to Fig.10 The second data processor 240 of the spatial light modulator 210 converts the holographic content image data input from the outside into holographic content image data of a preset second resolution. Then, the holographic content image data of the second resolution is transmitted to the display driving circuit 220 of the spatial light modulator 210.

[0119] As described above, the second resolution of the spatial light modulator 210 may be set to be different from the first resolution of the surface light source device 110. That is, the second resolution of the spatial light modulator 210 may be set to be higher than the first resolution of the surface light source device 110.

[0120] The display driving circuit 220 of the spatial light modulator 210 receives the holographic content image data of the second resolution from the second data processor 240, and arranges the holographic content image data according to the preset second resolution. Then, the holographic content image data of the second resolution is converted into an analog image signal and provided to the liquid crystal pixels arranged on the image display surface DA2 of the liquid crystal image display unit DU2. Therefore, the spatial light modulator 210 generates a holographic content image FH(210) of a second resolution higher than the first resolution by the background light of the first resolution provided from the surface light source device 110, and displays the holographic content image FH(210) on the front surface.

[0121] Fig.11 A holographic image and resolution displayed by a holographic display device are shown.

[0122] refer to Fig.11 , the background light of the first resolution provided from the surface light source device 110 and the holographic content image of the second resolution according to the spatial light modulator 210 are mixed so that the holographic content image FH(200) of the third resolution is displayed on the front surface of the spatial light modulator 210.

[0123] The holographic content image FH(200) of the third resolution is provided to the image transmission member 310, and the image transmission member 310 forms a display path (or optical path) of the holographic content image FH, so that the holographic content image FH of the third resolution can be displayed in a preset space or on a display surface. Therefore, the holographic content image FH(210) displayed by the at least one spatial light modulator 210 is guided to a predetermined space through at least one of an optical waveguide, a diffusion lens, and a focusing lens, and is recognized as the holographic content image FH(200) in a real space.

[0124] Fig.12 The backlight of the surface light source device 110 and the backlight display resolution are shown. Fig.13 The displayed image and the image display resolution of the spatial light modulator 210 are shown.

[0125] refer to Fig.12 and Fig.13 , the emission driving circuit 120 of the surface light source device 110 receives the holographic content image data of the first resolution from the first data processor 140, and arranges the holographic content image data according to the first resolution. Then, the holographic content image data of the first resolution is converted into an analog image signal and provided to the light-emitting pixels arranged on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1.

[0126] An image FH(110) according to the first resolution is displayed on the organic light emitting display surface DA1 of the surface light emitting unit DU1, and image display light according to the first resolution is provided to the spatial light modulator 210 as a surface light source and background light.

[0127] The display driving circuit 220 of the spatial light modulator 210 receives the holographic content image data of the second resolution from the second data processor 240, and arranges the holographic content image data according to the preset second resolution. Then, the holographic content image data of the second resolution is converted into an analog image signal and provided to the liquid crystal pixels arranged on the image display surface DA2 of the liquid crystal image display unit DU2.

[0128] The spatial light modulator 210 generates a holographic contents image FH(210) of a second resolution higher than the first resolution through the background light of the first resolution provided from the surface light source device 110, and displays the holographic contents image FH(210) on the front surface.

[0129] Fig.14 A holographic image and resolution displayed by a holographic display device are shown.

[0130] like Fig.14As shown in , the background light of the first resolution provided from the surface light source device 110 and the holographic content image FH(210) of the second resolution according to the spatial light modulator 210 are mixed so that the holographic content image FH(200) of the third resolution is displayed on the front surface of the spatial light modulator 210.

[0131] The holographic content image FH(200) of the third resolution is provided to the image transmission member 310, and the image transmission member 310 defines a display path (or optical path) of the holographic content image FH(200) so that the holographic content image FH of the third resolution can be displayed on a preset space or display surface.

[0132] Fig.15 Shows Figure 4 and Figure 5 2 is an exemplary arrangement structure of light-emitting pixels OSP in a surface light-emitting unit DU1 of a surface light source device 110 shown in FIG.

[0133] Specifically, Fig.15 The arrangement structure of some light-emitting pixels OSP arranged in a 15×9 array on the organic light-emitting display surface DA1 is shown. Fig.15 The arrangement form of the light-emitting pixels OSP is shown, from the light-emitting pixels OSP disposed at the 1×1 position to the light-emitting pixels OSP disposed at the 15×9 position.

[0134] The organic light emitting display surface DA1 of the surface light emitting unit DU1 is divided into a plurality of light emitting regions, for example, first to third light emitting regions LB1 to LB3 , in which light emitting element layers EML1 of light emitting pixels OSP are disposed at different heights or steps.

[0135] In an embodiment, a plurality of first unit light-emitting pixels UP1 are disposed in a plurality of first light-emitting regions LB1 on an organic light-emitting display surface DA1, in which a light-emitting element layer EML1 is formed at a preset height of a first step. Each of the first unit light-emitting pixels UP1 includes a first sub-light-emitting pixel OSP1, a second sub-light-emitting pixel OSP2, and a third sub-light-emitting pixel OSP3 that emit red light, green light, and blue light, respectively. The first unit light-emitting pixel UP1 disposed in each of the first light-emitting regions LB1 emits light through the light-emitting element layer EML1 formed at a preset height of the first step.

[0136] A plurality of second unit light-emitting pixels UP2 are arranged in a plurality of second light-emitting regions LB2 on the organic light-emitting display surface DA1, in which a light-emitting element layer EML1 is formed at a height of a second step higher than a height of the first step. Each of the second unit light-emitting pixels UP2 may also include a first sub-light-emitting pixel OSP1, a second sub-light-emitting pixel OSP2, and a third sub-light-emitting pixel OSP3 that emit red light, green light, and blue light, respectively. The second unit light-emitting pixel UP2 arranged in each of the second light-emitting regions LB2 performs a light-emitting operation by forming a light-emitting element layer EML1 at the height of the second step.

[0137] A plurality of third unit light-emitting pixels UP3 are arranged in a plurality of third light-emitting regions LB3 on the organic light-emitting display surface DA1, in which the light-emitting element layer EML1 is formed at a height of a third step higher than a height of the second step. Each of the third unit light-emitting pixels UP3 may also include a first sub-light-emitting pixel OSP1, a second sub-light-emitting pixel OSP2, and a third sub-light-emitting pixel OSP3 that emit red light, green light, and blue light, respectively. The third unit light-emitting pixel UP3 arranged in each of the third light-emitting regions LB3 performs a light-emitting operation by forming a light-emitting element layer EML1 at the height of the third step.

[0138] Fig.16 is a cross-sectional view showing a stepped structure of a light-emitting pixel in each light-emitting region of a surface light source device. Specifically, Fig.16 It is shown that the arrangement Fig.15 A cross-sectional view of a stepped structure of a light-emitting pixel in any light-emitting pixel row.

[0139] refer to Fig.16 In the plurality of first unit light-emitting pixels UP1 disposed in the plurality of first light-emitting regions LB1, the light-emitting element layer EML1 is formed at a preset height of the first step. Therefore, each of the first sub-pixel OSP1, the second sub-pixel OSP2, and the third sub-pixel OSP3 disposed in the first light-emitting region LB1 emits light at the height of the first step through the light-emitting element layer EML1 formed at the height of the first step.

[0140] In the plurality of second unit light-emitting pixels UP2 disposed in the plurality of second light-emitting regions LB2, the light-emitting element layer EML1 is formed at a height of a second step higher than the first step. Therefore, each of the first sub-pixel OSP1, the second sub-pixel OSP2, and the third sub-pixel OSP3 disposed in the second light-emitting region LB2 emits light at the height of the second step through the light-emitting element layer EML1 formed at the height of the second step.

[0141] In the plurality of third unit light-emitting pixels UP3 disposed in the plurality of third light-emitting regions LB3, the light-emitting element layer EML1 is formed at a height of a third step higher than the second step. Therefore, each of the first sub-pixel OSP1, the second sub-pixel OSP2, and the third sub-pixel OSP3 disposed in the third light-emitting region LB3 emits light at the height of the third step through the light-emitting element layer EML1 formed at the height of the third step.

[0142] Fig.17 1 is a cross-sectional view showing in detail the cross-sectional structure of a light-emitting pixel formed in the first light-emitting area LB1 of the surface light source device. Specifically, Fig.17 1 is a cross-sectional view showing thin film transistors ST and a light emitting element layer EML1 respectively formed in first, second, and third sub-pixels OSP1, OSP2, and OSP3 of the first light emitting region LB1.

[0143] refer to Fig.17 , the barrier layer BR may be disposed on the first substrate SUB1. The first substrate SUB1 may include or consist of an insulating material such as a polymer resin. In an embodiment, for example, the first substrate SUB1 may include or consist of PI. The first substrate SUB1 may be a flexible substrate that may be bent, folded, or rolled.

[0144] The barrier layer BR is used to protect the thin film transistor layer (eg, Figure 5 The barrier layer BR is a layer that protects the thin film transistor ST of the TFTL1 and the organic light emitting layer 172 of the light emitting element layer EML1 from moisture introduced through the first substrate SUB1 (susceptible to moisture penetration). The barrier layer BR may be composed of a plurality of inorganic layers alternately stacked.

[0145] The thin film transistors ST of the pixel driver may be formed and disposed on the barrier layer BR. Each of the thin film transistors ST includes an active layer ACT1, a gate electrode G1, a source electrode S1, and a drain electrode D1.

[0146] In an embodiment, for example, the active layer ACT1, the source electrode S1, and the drain electrode D1 of the thin film transistor ST may be disposed on the barrier layer BR. The active layer ACT1 of the thin film transistor ST includes polycrystalline silicon, single crystal silicon, low temperature polycrystalline silicon, amorphous silicon, or an oxide semiconductor. The portion of the active layer ACT1 overlapping with the gate electrode G1 in the thickness direction of the first substrate SUB1 may be defined as a channel region. The source electrode S1 and the drain electrode D1 are regions that do not overlap with the gate electrode G1, and may be formed to have conductivity by doping a silicon semiconductor or an oxide semiconductor with ions or impurities.

[0147] The gate insulating layer 131 may be disposed on the active layer ACT1, the source electrode S1, and the drain electrode D1 of the thin film transistor ST. The gate insulating layer 131 may include or consist of an inorganic layer such as a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0148] The gate electrode G1 of the thin film transistor ST may be disposed on the gate insulating layer 131. The gate electrode G1 may overlap the active layer ACT1 in the thickness direction. Each of the gate electrodes G1 may be a single layer or a multilayer including any one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys thereof.

[0149] The first interlayer insulating layer 141 may be disposed on the gate electrode G1 of the thin film transistor ST. The first interlayer insulating layer 141 may include or be composed of an inorganic layer, such as 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 layer 141 may include a plurality of inorganic layers.

[0150] The capacitor electrode CAE may be disposed on the first interlayer insulating layer 141. The capacitor electrode CAE may overlap the gate electrode G1 of the thin film transistor ST in the thickness direction. Since the first interlayer insulating layer 141 has a predetermined dielectric constant, a capacitor may be formed by the capacitor electrode CAE, the gate electrode G1, and the first interlayer insulating layer 141 disposed therebetween. Each of the capacitor electrodes CAE may be a single layer or a multilayer including any one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys thereof.

[0151] The second interlayer insulating layer 142 may be disposed on the capacitor electrode CAE. The second interlayer insulating layer 142 may include or be composed of an inorganic layer, 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 layer 142 may include a plurality of inorganic layers.

[0152] A plurality of contact holes are defined in the gate insulating layer 131 , the first interlayer insulating layer 141 , and the second interlayer insulating layer 142 , and a source electrode terminal and a first light emitting electrode 171 serving as an anode are formed in the contact holes of the gate insulating layer 131 , the first interlayer insulating layer 141 , and the second interlayer insulating layer 142 .

[0153] A pixel defining layer 190 may be formed on the second interlayer insulating layer 142 to separate the first light emitting electrode 171 .

[0154] In the emission region of each of the sub-light-emitting pixels OSP1 to OSP3 , a light-emitting element layer EML1 including a first light-emitting electrode 171 , an organic light-emitting layer 172 , and a common electrode 173 , which are sequentially disposed, is formed at a preset height of the first step.

[0155] Fig.18 Detailedly, FIG. 1 is a cross-sectional view showing the cross-sectional structure of a light-emitting pixel formed in the second light-emitting region of the surface light source device. Specifically, Fig.18 1 is a cross-sectional view showing thin film transistors ST and a light emitting element layer EML1 respectively formed in the first sub-pixel OSP1, the second sub-pixel OSP2, and the third sub-pixel OSP3 of the second light emitting region LB2.

[0156] The thin film transistors ST of the first, second and third sub-pixels OSP1, OSP2 and OSP3 disposed in the second light emitting region LB2 are formed on the same stepped layer and through the same process as the thin film transistor ST formed in the first light emitting region LB1.

[0157] However, in the thin film transistors ST of the first to third sub-light emitting pixels OSP1 to OSP3 disposed in the second light emitting region LB2, the first anode connection electrode ANDE1 is disposed in a contact hole penetrating the gate insulating layer 131, the first interlayer insulating layer 141, and the second interlayer insulating layer 142. In an embodiment, for example, the first anode connection electrode ANDE1 may be connected to the drain electrode D1 of the thin film transistor ST through the first connection contact hole ANCT1 penetrating the gate insulating layer 131, the first interlayer insulating layer 141, and the second interlayer insulating layer 142. Each of the first anode connection electrodes ANDE1 may be a single layer or a multilayer including any one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys thereof.

[0158] The first planarization layer 160 may be disposed on the first anode connection electrode ANDE1 to planarize a step formed by the thin film transistor ST. The first planarization layer 160 may include or consist of an organic layer including, for example, acrylic resin, epoxy resin, phenolic resin, polyamide resin, or PI resin.

[0159] A plurality of connection contact holes are defined in the first planarization layer 160, and first light emitting electrodes 171 serving as anodes are formed in the connection contact holes of the first planarization layer 160. The first light emitting electrodes 171 disposed in the first and second light emitting regions LB1 and LB2 may be simultaneously formed by the same patterning process.

[0160] The pixel defining layer 190 may be formed on the first planarization layer 160 to separate the first light emitting electrode 171. The pixel defining layers 190 respectively disposed in the first light emitting area LB1 and the second light emitting area LB2 may also be simultaneously formed through the same patterning process.

[0161] In the emission region of each of the sub-pixels OSP1 to OSP3, a light emitting element layer EML1 including a first light emitting electrode 171, an organic light emitting layer 172, and a common electrode 173 sequentially disposed is formed at a preset height of the second step. The light emitting element layer EML1 formed in the first light emitting region LB1 and the second light emitting region LB2 may be simultaneously formed by the same patterning process, but is formed to have different steps at the first height and the second height.

[0162] Fig.19 4 is a cross-sectional view showing in detail the cross-sectional structure of a light-emitting pixel formed in the third light-emitting area LB3 of the surface light source device. Specifically, Fig.19 1 is a cross-sectional view showing the thin film transistors ST and the light emitting element layer EML1 respectively formed in the first sub-pixel OSP1, the second sub-pixel OSP2, and the third sub-pixel OSP3 of the third light emitting region LB3.

[0163] The thin film transistors ST of the first, second and third sub-pixels OSP1, OSP2 and OSP3 arranged in the third light emitting area LB3 are formed on the same stepped layer and through the same process as the thin film transistors ST formed in the first and second light emitting areas LB1 and LB2.

[0164] However, the second anode connection electrode ANDE2 may be disposed on the first planarization layer 160 formed in the third light emitting region LB3. The second anode connection electrode ANDE2 may be connected to the first anode connection electrode ANDE1 through a second connection contact hole ANCT2 penetrating the first planarization layer 160. Each of the second anode connection electrodes ANDE2 may be a single layer or a multilayer including any one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and alloys thereof.

[0165] The second planarization layer 180 may be disposed on the second anode connection electrode ANDE2. The second planarization layer 180 may include or consist of an organic layer including, for example, acrylic resin, epoxy resin, phenolic resin, polyamide resin, or PI resin.

[0166] A plurality of connection contact holes ANCT3 are defined in the second planarization layer 180, and first light emitting electrodes 171 serving as anodes are formed in the connection contact holes ANCT3 of the second planarization layer 180. The first light emitting electrodes 171 disposed in the first to third light emitting regions LB1 to LB3 may be simultaneously formed by the same patterning process.

[0167] The pixel defining layer 190 may be formed on the second planarization layer 180 to separate the first light emitting electrode 171. The pixel defining layers 190 respectively disposed in the first to third light emitting regions LB1 to LB3 may also be simultaneously formed through the same patterning process.

[0168] In the emission region of each of the sub-pixels OSP1 to OSP3, a light emitting element layer EML1 including a first light emitting electrode 171, an organic light emitting layer 172, and a common electrode 173 sequentially disposed is formed at a preset height of the third step. The light emitting element layer EML1 formed in the first to third light emitting regions LB1 to LB3 may be simultaneously formed by the same patterning process, but is formed to have different steps at the first to third heights.

[0169] Fig. 20 The background light of the first light emitting area LB1 and the background light display resolution are shown.

[0170] refer to Fig. 20 , the first data processor 140 of the surface light source device 110 extracts and divides the holographic content image data of the first light emitting area LB1 corresponding to the positions of the sub-light emitting pixels OSP1 to OSP3 provided in the first light emitting area LB1 from the holographic content image data input from the outside. The first data processor 140 transmits the extracted and divided holographic content image data of the first light emitting area LB1 to the emission driving circuit 120 of the surface light source device 110.

[0171] The emission driving circuit 120 receives the extracted and divided holographic content image data of the first light emitting area LB1 from the first data processor 140, and arranges the extracted and divided holographic content image data according to the position of each of the sub-pixels OSP1 to OSP3 in the first light emitting area LB1.

[0172] Fig.21 The background light of the second light emitting area LB2 and the background light display resolution are shown.

[0173] refer to Fig.21, the first data processor 140 of the surface light source device 110 extracts and divides the holographic content image data of the second light emitting area LB2 corresponding to the positions of the sub-pixels OSP1 to OSP3 disposed in the second light emitting area LB2 from the holographic content image data input from the outside. The first data processor 140 transmits the extracted and divided holographic content image data of the second light emitting area LB2 to the emission driving circuit 120 of the surface light source device 110.

[0174] The emission driving circuit 120 receives the extracted and divided holographic content image data of the second light emitting area LB2 from the first data processor 140, and arranges the extracted and divided holographic content image data according to the position of each of the sub-pixels OSP1 to OSP3 in the second light emitting area LB2.

[0175] Fig. 22 The background light of the third light emitting area LB3 and the background light display resolution are shown.

[0176] refer to Fig. 22 , the first data processor 140 of the surface light source device 110 extracts and divides the holographic content image data of the third light emitting area LB3 corresponding to the positions of the sub-light emitting pixels OSP1 to OSP3 disposed in the third light emitting area LB3 from the holographic content image data input from the outside. The first data processor 140 transmits the extracted and divided holographic content image data of the third light emitting area LB3 to the emission driving circuit 120 of the surface light source device 110.

[0177] The emission driving circuit 120 receives the extracted and divided holographic content image data of the third light emitting area LB3 from the first data processor 140, and arranges the extracted and divided holographic content image data according to the position of each of the sub-pixels OSP1 to OSP3 in the third light emitting area LB3.

[0178] Fig.23 The displayed image and the image display resolution of the spatial light modulator 210 are shown.

[0179] refer to Fig.23 The emission driving circuit 120 converts the holographic content image data of each of the first to third light-emitting areas LB1 to LB3 into an analog image signal for the first, second, or third light-emitting areas LB1, LB2, or LB3, and provides the analog image signal to the light-emitting pixels arranged on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1.

[0180] The image FH (110) divided into the first to third light emitting areas LB1 to LB3 is set on the organic light emitting display surface DA1 of the surface light emitting unit DU1, and the image display light for each of the first to third light emitting areas LB1 to LB3 is provided to the spatial light modulator 210 as a surface light source and background light.

[0181] The surface light emitting unit DU1 generates image display light at different step heights for each of the first to third light emitting areas LB1 to LB3, and provides 3D image display light of different step heights to the spatial light modulator 210 as background light, thereby further improving the 3D effect of the holographic image.

[0182] Fig.24 is a cross-sectional view showing a stepped structure of a light-emitting pixel in each light-emitting area of ​​the surface light source device 110 .

[0183] refer to Fig.24 , the surface light emitting unit DU1 of the surface light source device 110 may be formed on an elastic substrate and may be formed in the form of a stretchable type panel STBP. The first substrate SUB1 on which the surface light emitting unit DU1 is formed may be a flexible substrate that can be bent, folded, or curled. In an embodiment, the first substrate SUB1 may include, for example, a glass material or a metal material. However, the present disclosure is not limited thereto. In another embodiment, the first substrate SUB1 may include a polymer resin such as PI.

[0184] The stretchable type surface light emitting unit DU1 that can be flexibly deformed may be disposed on a separate first substrate SUB1 having different steps for each of the first to third light emitting regions LB1 to LB3. Therefore, the first to third light emitting regions LB1 to LB3 may be disposed at different steps.

[0185] The emission driving circuit 120 converts the holographic content image data of each of the first to third light-emitting areas LB1 to LB3 into an analog image signal for the first, second, or third light-emitting areas LB1, LB2, or LB3, and provides the analog image signal to light-emitting pixels arranged on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1.

[0186] Therefore, the image FH (110) divided into the first to third light-emitting areas LB1 to LB3 is set on the organic light-emitting display surface DA1 of the surface light-emitting unit DU1, and the image display light for each of the first to third light-emitting areas LB1 to LB3 is provided to the spatial light modulator 210 as a surface light source and background light.

[0187] The surface light emitting unit DU1 generates image display light at different step heights for each of the first to third light emitting areas LB1 to LB3, and provides 3D image display light of different step heights to the spatial light modulator 210 as background light, thereby further improving the 3D effect of the holographic image.

[0188] The holographic display device in the embodiment of the present disclosure can increase the resolution and 3D effect of a holographic image by modulating the resolution and 3D effect of a surface light source device that provides background light to a spatial light modulator.

[0189] In addition, the holographic display device in the embodiment of the present disclosure can generate image display light at different steps for each light-emitting area of ​​the surface light source device, and provide the image display light at different steps to the spatial light modulator as background light, thereby further improving the 3D effect of the holographic image.

[0190] However, the effects of the present disclosure are not limited to the effects set forth herein. The above and other effects of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure belongs by referring to the claims.

[0191] At the end of the detailed description, those skilled in the art will appreciate that many changes and modifications may be made to the preferred embodiment without departing substantially from the principles of the present disclosure. Therefore, the disclosed preferred embodiments of the present disclosure are used only in an overview and descriptive sense, and not for a limiting purpose.

Claims

1. A holographic display device, include: A spatial light modulator to display holographic content images; a surface light source device that generates image display light of a first resolution from behind the spatial light modulator and provides the image display light of the first resolution to the spatial light modulator as background light; as well as at least one image transmission component, defining a display path of the holographic content image, Wherein, the spatial light modulator generates a holographic content image of a second resolution by using the image display light of the first resolution as the background light, and the at least one image transmission component defines a display path of a holographic content image of a third resolution in which the image display light of the first resolution and the holographic content image of the second resolution are mixed.

2. The holographic display device according to claim 1, in, The surface light source device comprises: an organic light emitting display unit, generating the image display light of the first resolution as a surface light source; a first data processor which extracts the holographic content image data of the first resolution from the holographic content image data input from the outside, or converts the holographic content image data input from the outside into the holographic content image data of the first resolution; and The emission driving circuit converts the holographic content image data of the first resolution into an analog image signal, and provides the analog image signal to the organic light emitting pixels of the organic light emitting display unit.

3. The holographic display device according to claim 2, in, The spatial light modulator comprises: a liquid crystal image display unit that displays the holographic content image at the second resolution on a front surface by using the image display light at the first resolution provided from the surface light source device disposed behind the spatial light modulator as the background light; a second data processor which extracts the holographic content image data of the second resolution from the holographic content image data input from the outside, or converts the holographic content image data input from the outside into the holographic content image data of the second resolution; and a display driving circuit, converting the holographic content image data of the second resolution into an analog image signal, and providing the analog image signal to liquid crystal pixels of the liquid crystal image display unit, The first resolution is preset to be lower than the second resolution, and the third resolution is a mixture of the first resolution and the second resolution.

4. The holographic display device according to claim 2, in, The organic light emitting display unit of the surface light source device is pre-divided into a plurality of light emitting areas, in which light emitting element layers of the organic light emitting pixels are arranged at different heights or different steps.

5. The holographic display device according to claim 4, in, A plurality of first unit light-emitting pixels are arranged in a plurality of first light-emitting regions among the plurality of light-emitting regions into which the organic light-emitting display unit is divided, in which the light-emitting element layer is formed at a preset height of the first step, a plurality of second unit light-emitting pixels are arranged in a plurality of second light-emitting regions among the plurality of light-emitting regions, in which the light-emitting element layer is formed at a height of a second step higher than the preset height of the first step, and a plurality of third unit light-emitting pixels are arranged in a plurality of third light-emitting regions among the plurality of light-emitting regions, in which the light-emitting element layer is formed at a height of a third step higher than the height of the second step.

6. The holographic display device according to claim 5, in, The first data processor extracts and divides holographic content image data of each of the plurality of first light-emitting areas to the plurality of third light-emitting areas from the holographic content image data of the first resolution, and the holographic content image data corresponds to positions of the organic light-emitting pixels set in the plurality of first light-emitting areas, the plurality of second light-emitting areas or the plurality of third light-emitting areas.

7. The holographic display device according to claim 6, in, The emission driving circuit converts the holographic content image data in each of the multiple first light-emitting areas to the multiple third light-emitting areas into an analog image signal for the multiple first light-emitting areas, the multiple second light-emitting areas or the multiple third light-emitting areas, and provides the analog image signal to the organic light-emitting pixels in the multiple first light-emitting areas, the multiple second light-emitting areas or the multiple third light-emitting areas of the organic light-emitting display unit.

8. The holographic display device according to claim 1, in, The surface light source device generates the image display light of the first resolution as a surface light source by converting holographic content image data input from the outside into holographic content image data of the first resolution, converting the holographic content image data of the first resolution into an analog image signal, and providing the analog image signal to the organic light-emitting pixels of the organic light-emitting display unit.

9. The holographic display device according to claim 8, in, The spatial light modulator converts the holographic content image data input from the outside into holographic content image data of the second resolution, converts the holographic content image data of the second resolution into an analog image signal, and provides the analog image signal to the liquid crystal pixels of the liquid crystal image display unit, and displays the holographic content image of the second resolution on the front surface by using the image display light of the first resolution provided from the surface light source device arranged behind the spatial light modulator as the background light.

10. A holographic display device, include: A spatial light modulator to display holographic content images; a surface light source device that generates image display light of a first resolution from behind the spatial light modulator and provides the image display light of the first resolution to the spatial light modulator as background light; as well as at least one image transmission component, defining a display path of the holographic content image, wherein the spatial light modulator generates a holographic content image of a second resolution by using the image display light of the first resolution as the background light, and the at least one image transmission component defines a display path of a holographic content image of a third resolution in which the image display light of the first resolution and the holographic content image of the second resolution are mixed, and wherein the first resolution is preset to be a resolution lower than the second resolution, and the third resolution is a mixture of the first resolution and the second resolution.

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