Hologram display device

Abstract

The holographic display device includes: a light generator for generating light; a spatial light modulator for forming an interference pattern; and a controller for supplying interference data to the spatial light modulator for forming the interference pattern. The spatial light modulator is formed by a plurality of pixels and includes: a first region arranging the plurality of pixels in a first pattern; and a second region arranging the plurality of pixels in a second pattern different from the first pattern. The controller includes: a data generator for generating first interference data for the first region and second interference data for the second region; a compensator for outputting first correction data generated based on the first interference data and second correction data generated by correcting the second interference data using a first difference value between the first pattern and the second pattern; and an output device for outputting the interference data based on the first correction data and the second correction data.

Description

Technical Field

[0001] The present invention relates to a hologram display device and a driving method for a hologram display device, and more specifically to a hologram display device for preventing noise in a holographic stereoscopic image and a driving method for a hologram display device. Background Technology

[0002] Holographic stereoscopic imaging technology can fundamentally avoid the eye strain associated with current stereoscopic methods that rely on binocular disparity. Therefore, this next-generation stereoscopic imaging technology, as the ultimate goal, is attracting considerable attention. Unlike previous methods that relied on optical illusions to perceive depth, holographic images allow the eyes to directly view the actual image, thus providing a stereoscopic experience indistinguishable from viewing the real object. Therefore, it has the advantage of not causing eye strain even after prolonged viewing or listening.

[0003] Holographic methods utilize the principle of recording and reproducing the interference signal obtained by overlapping the light reflected from the object (object wave) and the light that interferes with it (reference wave).

[0004] A computer-generated hologram (CGH) is data calculated by an external device to display a desired holographic image. When the external device sends a CGH to a spatial light modulator (SLM), a holographic interference pattern is formed in the SLM. When light is shone onto the SLM, the holographic interference pattern displayed by the SLM is restored to a holographic image. Summary of the Invention

[0005] The present invention relates to a holographic display device for preventing noise in holographic stereoscopic images and a driving method for the holographic display device.

[0006] An embodiment of the present invention relates to a holographic display device comprising: a light generator for generating light; a spatial light modulator for forming an interference pattern to interfere with the light; and a controller for supplying interference data to the spatial light modulator for forming the interference pattern. The spatial light modulator is formed by a plurality of pixels and includes: a first region where the plurality of pixels are arranged in a first pattern; and a second region where the plurality of pixels are arranged in a second pattern different from the first pattern. The controller includes a data generator, a compensator, and an output device. The data generator generates first interference data for the first region and second interference data for the second region. The compensator outputs first correction data generated based on the first interference data and second correction data generated by correcting the second interference data using a first difference value between the first pattern and the second pattern. The output device outputs the interference data based on the first correction data and the second correction data.

[0007] As an embodiment of the present invention, the first difference value may include: a first lateral difference value, defined by the difference between the average position data of a first reference pixel displaying the same color selected from a plurality of pixels configured in the first region in a first direction and the average position data of a second reference pixel selected from a plurality of pixels configured in the second region and displaying the same color as the first reference pixel in the first direction; and a first longitudinal difference value, defined by the difference between the average position data of the first reference pixel in a second direction perpendicular to the first direction and the average position data of the second reference pixel in the second direction.

[0008] As an embodiment of the present invention, the first region may be formed by the first pattern of the spatial light modulator arranged in all odd-numbered rows, and the second region may be formed by the second pattern of the spatial light modulator arranged in all even-numbered rows, wherein the configuration of the second reference pixel in the second pattern is different from the configuration of the first reference pixel in the first pattern.

[0009] As an embodiment of the present invention, the compensator may include: a first converter, which performs a Fourier transform on the first interference data to generate first frequency data and performs a Fourier transform on the second interference data to generate second frequency data, wherein the compensator outputs the first frequency data as the first correction data.

[0010] As an embodiment of the present invention, the compensator may further include: a multiplier that multiplies the second frequency data by a first compensation value determined according to the first difference value to generate the second correction data.

[0011] As an embodiment of the present invention, the output device may include: a synthesizer that outputs frequency data based on the first correction data and the second correction data; and a second converter that performs an inverse Fourier transform on the frequency data to output the interference data.

[0012] As an embodiment of the present invention, the spatial light modulator may further include a third region of a plurality of the pixels arranged in a third pattern different from the first pattern and the second pattern. The data generator may also generate third interference data for the third region. The compensator may correct the third interference data using a second difference value obtained by comparing the first pattern and the third pattern, thereby also outputting third corrected data. The output device may output the interference data based on the first corrected data to the third corrected data.

[0013] As an embodiment of the present invention, the first difference value may include: a first lateral difference value, defined by the difference between the average position data of a first reference pixel selected from a plurality of pixels configured in the first region that displays the same color in a first direction and the average position data of a second reference pixel selected from a plurality of pixels configured in the second region that displays the same color as the first reference pixel in the first direction; and a first vertical difference value, defined by the difference between the average position data of the first reference pixel in a second direction perpendicular to the first direction and the average position data of the second reference pixel in the second direction. Alternatively, the second difference value may include: a second lateral difference value, defined by the difference between the average position data of a first reference pixel selected from a plurality of pixels configured in the first region in a first direction and the average position data of a third reference pixel selected from a plurality of pixels configured in the third region that displays the same color as the first reference pixel in the first direction; and a second vertical difference value, defined by the difference between the average position data of the first reference pixel in a second direction perpendicular to the first direction and the average position data of the third reference pixel in the second direction.

[0014] As an embodiment of the present invention, the compensator may include: a first converter that performs a Fourier transform on the first interference data to generate first frequency data, performs a Fourier transform on the second interference data to generate second frequency data, and performs a Fourier transform on the third interference data to generate third frequency data, wherein the compensator outputs the first frequency data as the first correction data.

[0015] As an embodiment of the present invention, the compensator may further include: a first multiplier that multiplies the second frequency data by a first compensation value determined according to the first difference value to generate the second corrected data; and a second multiplier that multiplies the third frequency data by a second compensation value determined according to the second difference value to generate the third corrected data.

[0016] As an embodiment of the present invention, the output device may include: a synthesizer that outputs frequency data based on the first correction data to the third correction data; and a second converter that performs an inverse Fourier transform on the frequency data to output the interference data.

[0017] (Invention Effects)

[0018] According to the present invention, an interference pattern can be formed for a holographic display device. This prevents noise in the holographic stereoscopic image. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating a holographic display device according to an embodiment of the present invention.

[0020] Figure 2 It is used for explanation Figure 1 The diagram shows the operation of the spatial light modulator.

[0021] Figure 3a and Figure 3b This is a plan view illustrating a spatial light modulator according to an embodiment of the present invention.

[0022] Figure 4 This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0023] Figures 5a to 5c This is a plan view illustrating a spatial light modulator according to an embodiment of the present invention.

[0024] Figure 6 This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0025] Figure 7 This is a plan view illustrating a spatial light modulator according to an embodiment of the present invention.

[0026] Figure 8 This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0027] Figure 9 This is a plan view illustrating a spatial light modulator according to an embodiment of the present invention.

[0028] Figure 10This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0029] (Symbol Explanation)

[0030] HDP: Holographic display device; IFP: Interference pattern; SLM: Spatial light modulator; LTG: Light generator; LT: Light; HDATA: Interference data; CTL: Controller; DA1: First region; DA2: Second region; HDATA1: First interference data; HDATA2: Second interference data; HDATA3: Third interference data; CDATA1: First compensation data; CDATA2: Second compensation data; CDATA3: Third compensation data; MD1: First difference value; CPG: Compensator; OTG: Output device; FDATA1: First frequency Frequency data; FDATA2: Second frequency data; MD2: Second difference value; CMP1: First compensation value; CMP2: Second compensation value; MLP: Multiplier; MLP1: First multiplier; MLP2: Second multiplier; FDATA: Frequency data; PX: Pixel; DTG: Data generator; DR1: First direction; DR2: Second direction; PT1: First pattern; PT2: Second pattern; PT3: Third pattern; dx12: First lateral difference value; dy12: First longitudinal difference value; dx13: Second lateral difference value; dy13: Second longitudinal difference value. Detailed Implementation

[0031] In this specification, when it is mentioned that a certain component (or region, layer, part, etc.) is located on, connected to or combined with other components, it means that it can be directly configured / connected / combined with other components, or a third component can be configured therein.

[0032] The same symbols refer to the same constituent elements. In addition, the thickness, proportions, and dimensions of the constituent elements in the various figures are exaggerated for the purpose of effectively illustrating the technical content.

[0033] "And / or" includes more than one combination of all possible related components.

[0034] The terms "first," "second," etc., can be used to describe various constituent elements, but the constituent elements described should not be limited to these terms. These terms are used only for the purpose of distinguishing one constituent element from others. For example, without departing from the scope of this invention, a first constituent element can be named a second constituent element, and similarly, a second constituent element can be named a first constituent element. Singular expressions include multiple expressions unless explicitly stated otherwise in the text.

[0035] Furthermore, terms such as "below," "on the lower side," "above," and "on the upper side" are used to explain the connection relationships between the components in the diagram. These terms are relative concepts and are explained based on the direction shown in the diagram.

[0036] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) shall have the same meaning as commonly understood by those skilled in the art. Furthermore, terms defined in commonly used dictionaries shall be interpreted as having a meaning consistent with the relevant technical context, and shall not be interpreted as having an idealized or overly formal meaning unless explicitly defined in this application.

[0037] Terms such as “including” or “having” should be understood as referring to the presence of features, figures, steps, operations, constituent elements, components, or combinations thereof as recorded in the instruction manual, and do not preclude the existence or additional possibilities of one or more other features, figures, steps, operations, constituent elements, components, or combinations thereof.

[0038] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings.

[0039] Figure 1 This is a schematic diagram illustrating a holographic display device according to an embodiment of the present invention. Figure 2 It is used for explanation Figure 1 The diagram shows a planar block diagram of the operation of the spatial light modulator.

[0040] Reference Figure 1 The holographic display device HDP includes a light generator LTG, a spatial light modulator SLM, and a controller CTL.

[0041] A light generator LTG may include at least one light source that generates light LT. The light generator LTG can output coherent planar light. The light source may be a laser or a light-emitting diode that emits coherent light. The light generator LTG may be equipped with red, green, and blue lasers or red, green, and blue light-emitting diodes as the light source. Furthermore, as another example, the light generator LTG may be equipped with a white light source that outputs white light. The light generator LTG may also include other elements for outputting the light LT emitted from the light source as planar light parallel to one side of the spatial light modulator SLM.

[0042] The spatial light modulator (SLM) performs spatial light modulation on the light LT received from the light generator (LTG).

[0043] Reference Figure 1 and Figure 2A spatial light modulator (SLM) can form an interference pattern (IFP) corresponding to the desired holographic stereoscopic image (HGM). Light LT, output from a light generator (LTG), illuminates one side of the SLM. The SLM can be implemented using a transmissive liquid crystal display panel comprising a liquid crystal layer formed between two substrates. When the SLM is a transmissive liquid crystal display panel, the light LT illuminating one side of the SLM passes through the interference pattern (IFP) displayed on the SLM, thereby displaying the holographic stereoscopic image (HGM) on the other side of the SLM.

[0044] A spatial light modulator (SLM) may include a data driving unit (DD), a gate driving unit (GD), and a display panel (DP) forming an interference pattern. The display panel (DP) may include multiple pixels (PX) and multiple signal lines (GL, DL) connected to the multiple pixels (PX). The multiple pixels (PX) may be arranged in a first direction (DR1) and a second direction (DR2). The multiple pixels (PX) may be configured to be spaced apart from each other to prevent mutual interference.

[0045] Multiple pixels (PX) can be independently driven via multiple signal lines (GL, DL). The signal lines (GL, DL) can include multiple gate lines (GL) and multiple data lines (DL). The gate lines (GL) can be arranged in a first direction (DR1), and the data lines (DL) can be arranged in a second direction (DR2) orthogonal to the first direction (DR1). Each pixel (PX) can include a transistor, two transparent electrodes, and a liquid crystal layer disposed between the two transparent electrodes. The transistor can be connected to its corresponding gate line (GL) and corresponding data line (DL) to control the on / off state of each pixel (PX). When each pixel (PX) is turned on, an electric field can be formed between the two transparent electrodes. Depending on the magnitude of the electric field, the transmittance of the liquid crystal layer can be varied, thereby adjusting the transmittance of the light (LT) provided by the light generator (LTG).

[0046] The gate driving unit GD is connected to multiple gate lines GL to drive the gate lines GL, and the data driving unit DD is connected to multiple data lines DL to drive the data lines DL.

[0047] The controller CTL applies the signal used to drive the spatial light modulator (SLM) to the SLM. The controller CTL receives input from an external device (e.g., a computer) COM, including a computer-generated hologram (CGH) and timing signals. The timing signals may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a clock signal. Based on the timing signals, the controller CTL generates a gate control signal (GCS) for controlling the gate driver unit (GD) and a data control signal (DCS) for controlling the data driver unit (DD). The controller CTL outputs the gate control signal (GCS) to the gate driver unit (GD) and the data control signal (DCS) to the data driver unit (DD). Furthermore, the controller CTL supplies interference data (HDATA) generated based on the received computer-generated hologram (CGH) to the data driver unit (DD).

[0048] The data drive unit DD supplies the data voltage to the data line DL, which transforms the interference data HDATA input from the controller CTL into an analog gamma compensation voltage.

[0049] After generating a gate pulse based on the gate control signal GCS to synchronize it with the data voltage supplied to the data line DL, the gate driving unit GD sequentially supplies the gate pulse to the gate line GL.

[0050] Computer-generated holograms (CGHs) are data calculated by an external device (COM) to display the interference pattern (IFP) required for displaying the desired holographic stereoscopic image in a spatial light modulator (SLM). The CGH generated by the external device COM is provided to the SLM. CGHs can be calculated using various methods, including point-based computer-generated holography, layer-based computer-generated holography, and mesh-based computer-generated holography. Typically, a CGH is calculated based on an arrangement of pixels (PXs) displaying the same color along the major or minor axis of the display panel (DP) in the SLM.

[0051] Figure 3a and Figure 3bThis is a plan view illustrating the area of ​​a spatial light modulator according to an embodiment of the present invention.

[0052] Reference Figure 3a and Figure 3b The spatial light modulator (SLM) consists of multiple pixels (PX) (see reference). Figure 2 The spatial light modulator (SLM) is formed such that each pixel PX includes a first pixel having a first color, a second pixel having a second color, and a third pixel having a third color. A first pattern PT1 and a second pattern PT2 can be formed based on the arrangement of the first to third pixels. The SLM may include a first region DA1 with each pixel PX arranged in the first pattern PT1 and a second region DA2 with each pixel PX arranged in the second pattern PT2. Specifically, the first pattern PT1 may include a plurality of odd-numbered pixel rows, which may be configured in the order of the first pixel, the second pixel, and the third pixel. The second pattern PT2 may include a plurality of even-numbered pixel rows, which may be configured in the order of the second pixel, the third pixel, and the first pixel.

[0053] The first pattern PT1 may include all odd-numbered rows of the spatial light modulator (SLM), and the second pattern PT2 may include all even-numbered rows of the spatial light modulator (SLM).

[0054] For ease of explanation, the first pixel of the first region DA1 will be denoted as "PR1", the second pixel of the first region DA1 as "PB1", and the third pixel of the first region DA1 as "PG1". Similarly, the first pixel of the second region DA2 will be denoted as "PR2", the second pixel of the second region DA2 as "PB2", and the third pixel of the second region DA2 as "PG2".

[0055] When defining each pixel PX displaying the same color in the first region DA1 as a first reference pixel, each pixel PX displaying the same color as the first reference pixel in the second region DA2 can be defined as a second reference pixel. The arrangement of the first reference pixels in the first region DA1 differs from the arrangement of the second reference pixels in the second region DA2. Specifically, with the first direction DR1 as a reference, the positions of the first reference pixels in the first region DA1 and the second reference pixels in the second region DA2 are different from each other. Therefore, the first reference pixels and the second reference pixels included in the spatial light modulator SLM may not be arranged on the second direction DR2.

[0056] Figure 4 This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0057] Reference Figure 4 Holographic display device HDP (reference) Figure 1 The controller CTL can include a data generator DTG, a compensator CPG, and an output OTG.

[0058] The data generator (DTG) receives input from external devices such as the COM (Command Center) to generate the computer-generated hologram (CGH). The DTG divides the entire area of ​​the spatial light modulator (SLM) into pixels (PX) arranged in a grid (see reference). Figure 2 After the pattern is regularly repeated across regions, interference data corresponding to each region is generated based on the received computer-generated hologram (CGH).

[0059] In one embodiment of the present invention, the data generator DTG can divide the entire region of the spatial light modulator SLM into a first region DA1 (refer to...). Figure 3a ) and the second region DA2 (refer to Figure 3b The data generator DTG generates first interference data HDATA1 for the first region DA1 of the spatial light modulator SLM and second interference data HDATA2 for the second region DA2 based on the received computer-generated hologram CGH.

[0060] The compensator CPG receives inputs of first interferometric data HDATA1 and second interferometric data HDATA2 from the data generator DTG. The compensator CPG can set any region within the spatial light modulator (SLM) region divided by the data generator DTG as a reference region. The compensator CPG can correct the first interferometric data HDATA1 and second interferometric data HDATA2 based on the difference between the pattern of each pixel PX arranged in the remaining region and the pattern of each pixel PX arranged in the reference region. Specifically, the difference value can be obtained by comparing the position data of each pixel PX arranged in the remaining region and the position data of each pixel PX arranged in the reference region. The compensator CPG can correct the first interferometric data HDATA1 and second interferometric data HDATA2 based on the aforementioned difference value, thereby outputting corrected data.

[0061] In one embodiment of the present invention, the compensator CPG receives input of first interferometric data HDATA1 and second interferometric data HDATA2 from the data generator DTG. The compensator CPG can set the first region DA1 as the reference region. The compensator CPG can compare the position data of the second reference pixels arranged in the second region DA2 and the first reference pixels arranged in the first region DA1 to obtain a first difference value. The compensator CPG may not perform separate compensation for the first interferometric data HDATA1 associated with the first region DA1 as the reference region. Therefore, the compensator CPG can generate first correction data CDATA1 based on the first interferometric data HDATA1. The compensator CPG can then use the first difference value MD1 (refer to...) Figure 6 The second interference data HDATA2 of the second region DA2 is corrected, and the second corrected data CDATA2 is output.

[0062] The output unit OTG can receive inputs of first correction data CDATA1 and second correction data CDATA2 from the compensator CPG. Based on the received first correction data CDATA1 and second correction data CDATA2, the output unit OTG can output interference data HDATA.

[0063] In one embodiment of the present invention, the output device OTG can receive inputs of first correction data CDATA1 and second correction data CDATA2 from the compensator CPG, and output interference data HDATA based thereon.

[0064] The spatial light modulator (SLM) receives interference data HDATA from the output unit OTG to form the interference pattern IFP (refer to). Figure 1 ).

[0065] Figures 5a to 5c This is a plan view of a spatial light modulator according to an embodiment of the present invention.

[0066] The arrangement in the first region DA1 can be compared (refer to...) Figure 3a The first reference pixel and the arrangement in the second region DA2 (refer to) Figure 3b The first difference value MD1 is obtained by using the position data of the second reference pixel (refer to) Figure 6 As an example of the present invention, the first difference value MD1 may include a first lateral difference value dx12 and a first longitudinal difference value dy12.

[0067] In an embodiment of the present invention, the difference between the average value of the position data x11 to x1n of the first reference pixel in the first direction DR1 and the average value of the position data x21 to x2n of the second reference pixel in the first direction DR1 can be used as the first lateral difference value dx12.

[0068] The difference between the average value of the position data y11 to y1n of the first reference pixel in the second direction DR2 perpendicular to the first direction DR1 and the average value of the position data y21 to y2n of the second reference pixel in the second direction DR2 can be used as the first longitudinal difference value dy12.

[0069] Reference Figure 4 and Figure 5a When the first red pixel PR1 arranged in the first region DA1 of the spatial light modulator SLM is used as the first reference pixel, the second red pixel PR2 arranged in the second region DA2 can be used as the second reference pixel.

[0070] For the first reference pixel PR1 and the second reference pixel PR2 representing the first color, a computer-generated hologram CGH is calculated. The controller CTL generates interference data HDATA for the first reference pixel PR1 and the second reference pixel PR2 and outputs it.

[0071] Reference Figure 4 and Figure 5b When the first blue pixel PB1 arranged in the first region DA1 of the spatial light modulator SLM is used as the first reference pixel, the second blue pixel PB2 arranged in the second region DA2 can be used as the second reference pixel.

[0072] For the first reference pixel PB1 and the second reference pixel PB2 representing the second color, a computer-generated hologram CGH is calculated. The controller CTL generates interference data HDATA for the first reference pixel PB1 and the second reference pixel PB2 and outputs it.

[0073] Reference Figure 4 and Figure 5c When the first green pixel PG1 arranged in the first region DA1 of the spatial light modulator SLM is used as the first reference pixel, the second green pixel PG2 arranged in the second region DA2 can be used as the second reference pixel.

[0074] For the first reference pixel PG1 and the second reference pixel PG2 representing the third color, the computer-generated hologram CGH is calculated. The controller CTL generates interference data HDATA for the first reference pixel PG1 and the second reference pixel PG2 and outputs it.

[0075] Interference data HDATA for each pixel PX representing the first to third colors can be input into the spatial light modulator (SLM), and an interference pattern IFP can be formed based on this (see reference). Figure 1 ).

[0076] Figure 6 This is a block diagram illustrating a controller according to an embodiment of the present invention.

[0077] Reference Figure 6 The compensator CPG may include a first converter CVG1 and a multiplier MLP. The output OTG may include a synthesizer SYG and a second converter CVG2.

[0078] As the first converter CVG1 performs Fourier transform on the first interference data HDATA1 and the second interference data HDATA2, the first interference data HDATA1 and the second interference data HDATA2, which have spatial region ranges respectively, can be transformed into the first frequency data FDATA1 and the second frequency data FDATA2, which have frequency domain ranges respectively.

[0079] In an embodiment of the invention, a first converter CVG1 receives inputs of first interferometric data HDATA1 and second interferometric data HDATA2 from a data generator DTG. The first converter CVG1 performs a Fourier transform on the first interferometric data HDATA1 to generate first frequency data FDATA1, and performs a Fourier transform on the second interferometric data HDATA2 to generate second frequency data FDATA2. The compensator CPG outputs the first frequency data FDATA1 as first correction data CDATA1.

[0080] The multiplier MLP receives the second frequency data FDATA2 as input from the first converter CVG1. The multiplier MLP multiplies the second frequency data FDATA2 by a first compensation value CMP1 determined according to a first difference value MD1 to generate the second corrected data CDATA2. The compensator CPG outputs the second corrected data CDATA2.

[0081] The first compensation value CMP1 can satisfy the following mathematical formula 1.

[0082] [Mathematical Expression 1]

[0083]

[0084] Here, f x It is the spatial frequency of the x-axis in the frequency domain, f y y is the spatial frequency along the y-axis, π is pi, j is the imaginary number, and d x It is the first horizontal difference value, d y This is the first longitudinal difference value.

[0085] The synthesizer SYG receives inputs of first correction data CDATA1 and second correction data CDATA2 from the compensator CPG. The synthesizer SYG synthesizes the first correction data CDATA1 and the second correction data CDATA2 to generate frequency data FDATA, and outputs the frequency data FDATA.

[0086] The second converter CVG2 receives frequency data FDATA as input from the synthesizer SYG and performs an inverse Fourier transform on it to generate interferometric data HDATA. The output converter OTG outputs the interferometric data HDATA. As the second converter CVG2 performs an inverse Fourier transform on the frequency data FDATA, the frequency data FDATA, which has a frequency domain range, can be transformed into interferometric data HDATA, which has a spatial domain range.

[0087] After the compensator CPG multiplies the second frequency data FDATA2 by a phase term equivalent to the first compensation value CMP1 in the frequency domain to generate the second corrected data CDATA2, the output OTG performs an inverse Fourier transform on the frequency data FDATA generated based on the second corrected data CDATA2, thus generating data that considers d. x (First lateral difference value) and d y Interference data HDATA (first longitudinal difference value). In this case, even if each pixel PX displays the same color in the spatial light modulator SLM, it is configured to match the display panel DP (refer to). Figure 2 The first direction DR1 (refer to) Figure 5a ) and the second direction DR2 (refer to) Figure 5a Even if the pixels PX are not aligned with the first direction DR1 and the second direction DR2 of the display panel DP, interference data HDATA will be input to the spatial light modulator SLM, which takes into account the case that each pixel PX is not aligned with the first direction DR1 and the second direction DR2 of the display panel DP, thereby generating the interference pattern IFP. Therefore, even if each pixel PX is not aligned with the first direction DR1 and the second direction DR2 of the display panel DP, no noise will be generated in the restored holographic stereoscopic image HGM.

[0088] Figure 7 This is a plan view illustrating the region included in a spatial light modulator according to an embodiment of the present invention.

[0089] Reference Figure 7 In a spatial light modulator (SLM), a first pattern PT1 can be formed based on the arrangement of the first to third pixels (see reference). Figure 3a ), second pattern PT2 (refer to) Figure 3b The spatial light modulator (SLM) may include a first pattern PT1 with pixels PX arranged in a pattern PX (see reference PT1). Figure 2 The first region DA1 (refer to) Figure 3a The second region DA2 of each pixel PX is arranged in the second pattern PT2 (refer to...). Figure 3b ) and the third region DA3 in which each pixel PX is arranged in the third pattern PT3.

[0090] Specifically, the first pattern PT1 can be configured in the order of first pixel, second pixel, and third pixel. The second pattern PT2 can be configured in the order of second pixel, third pixel, and first pixel. The third pattern PT3 can be configured in the order of third pixel, first pixel, and second pixel. Hereinafter, for ease of explanation, the first pixel arranged in the first region DA1 will be denoted as "PR1", the second pixel arranged in the first region DA1 as "PB1", and the third pixel arranged in the first region DA1 as "PG1". The first pixel arranged in the second region DA2 will be denoted as "PR2", the second pixel arranged in the second region DA2 as "PB2", and the third pixel arranged in the second region DA2 as "PG2". The first pixel arranged in the third region DA3 will be denoted as "PR3", the second pixel arranged in the third region DA3 as "PB3", and the third pixel arranged in the third region DA3 as "PG3".

[0091] When defining the pixels PX displaying the same color in each pixel PX configured in the first region DA1 as the first reference pixel, the pixels PX displaying the same color as the first reference pixel in each pixel PX configured in the second region DA2 can be defined as the second reference pixel, and the pixels PX displaying the same color as the first reference pixel selected from the pixels PX configured in the third region DA3 can be defined as the third reference pixel. The arrangement of the first reference pixel in the first region DA1 and the arrangement of the second reference pixel in the second region DA2 are different from the arrangement of the third reference pixel in the third region DA3. Specifically, the first reference pixel, the second reference pixel, and the third reference pixel are not arranged in the first direction DR1, nor are they arranged in the second direction DR2, which is perpendicular to the first direction DR1.

[0092] Figure 8 This is a block diagram illustrating a controller according to an embodiment of the present invention. Hereinafter, references to the referenced controller are omitted. Figure 4 The description is the same as the detailed description of the structure.

[0093] Reference Figure 7 and Figure 8 The data generator DTG generates first interference data HDATA1 for the first region DA1, second interference data HDATA2 for the second region DA2, and third interference data HDATA3 for the third region DA3 based on the received computer-generated hologram CGH.

[0094] The compensator CPG receives input from the data generator DTG, specifically first interferometric data HDATA1 to third interferometric data HDATA3. As an example of the invention, the compensator CPG can set the first region DA1 as the reference region. The compensator CPG can compare the position data of the second reference pixels arranged in the second region DA2 with the first reference pixels arranged in the first region DA1 to obtain a first difference value MD1 (refer to...). Figure 6 The compensator CPG can compare the position data of the third reference pixel arranged in the third region DA3 and the first reference pixel arranged in the first region DA1 to obtain the second difference value MD2 (refer to...). Figure 10 ).

[0095] The compensator CPG can omit separate compensation for the first interferometric data HDATA1 associated with the first region DA1, which serves as the reference region. Therefore, the compensator CPG can generate first corrected data CDATA1 based on the first interferometric data HDATA1. The compensator CPG can correct the second interferometric data HDATA2 for the second region DA2 based on the first difference value MD1, thereby outputting the second corrected data CDATA2. The compensator CPG can correct the third interferometric data HDATA3 for the third region DA3 based on the second difference value MD2, thereby outputting the third corrected data CDATA3.

[0096] The output unit OTG receives inputs of first correction data CDATA1 to third correction data CDATA3 from the compensator CPG. Based on the received first correction data CDATA1 to third correction data CDATA3, the output unit OTG outputs interference data HDATA.

[0097] Figure 9 This is a plan view illustrating a spatial light modulator according to an embodiment of the present invention.

[0098] Reference Figure 9 It can be compared and arranged in the first region DA1 (refer to) Figure 3a The first reference pixel and the arrangement in the third region DA3 (refer to) Figure 7 The position data of the third reference pixel is used to obtain the second difference value MD2 (refer to the position data of the third reference pixel). Figure 10 As an example of the present invention, the second difference value MD2 may include a second lateral difference value dx13 and a second longitudinal difference value dy13. In an embodiment of the present invention, the difference between the average value of the position data x11 to x1n of the first reference pixel in the first direction DR1 and the average value of the position data x31 to x3n of the third reference pixel in the first direction DR1 can be used as the second lateral difference value dx13.

[0099] The difference between the average value of the position data y11 to y1n of the first reference pixel in the second direction DR2 and the average value of the position data y31 to y3n of the third reference pixel in the second direction DR2 can be used as the second longitudinal difference value dy13.

[0100] Figure 10 This is a block diagram illustrating a controller according to an embodiment of the present invention. Hereinafter, references to the referenced controller are omitted. Figure 6 The description is the same as the detailed description of the structure.

[0101] Reference Figure 10 The compensator CPG may include a first converter CVG1, a first multiplier MLP1, and a second multiplier MLP2. The output unit OTG may include a synthesizer SYG and a second converter CVG2.

[0102] The first converter CVG1 can perform Fourier transforms on the first interferometric data HDATA1 to the third interferometric data HDATA3. It can transform the first interferometric data HDATA1, the second interferometric data HDATA2, and the third interferometric data HDATA3, which have spatial domain ranges respectively, into the first frequency data FDATA1, the second frequency data FDATA2, and the third frequency data FDATA3, which have frequency domain ranges respectively.

[0103] In an embodiment of the invention, a first converter CVG1 receives first interferometric data HDATA1, second interferometric data HDATA2, and third interferometric data HDATA3 as input from a data generator DTG. The first converter CVG1 performs a Fourier transform on the first interferometric data HDATA1 to generate first frequency data FDATA1, performs a Fourier transform on the second interferometric data HDATA2 to generate second frequency data FDATA2, and performs a Fourier transform on the third interferometric data HDATA3 to generate third frequency data FDATA3. The compensator CPG outputs the first frequency data FDATA1 as first correction data CDATA1.

[0104] The second multiplier MLP2 receives the third frequency data FDATA3 as input from the first converter CVG1. The second multiplier MLP2 multiplies the third frequency data FDATA3 by the second compensation value CMP2 determined according to the second difference value MD2 to generate the third corrected data CDATA3. The compensator CPG outputs the third corrected data CDATA3. The second compensation value CMP2 satisfies mathematical equation 1. Here, the description of the first multiplier MLP1 is as follows... Figure 6 The multiplier MLP is the same, so detailed descriptions are omitted.

[0105] The synthesizer SYG receives inputs of first correction data CDATA1 to third correction data CDATA3 from the compensator CPG. The synthesizer SYG synthesizes the first correction data CDATA1 to the third correction data CDATA3 to generate frequency data FDATA, and outputs the frequency data FDATA.

[0106] The second converter CVG2 receives frequency data FDATA as input from the synthesizer SYG and performs an inverse Fourier transform on it to generate interferometric data HDATA. The output converter OTG outputs the interferometric data HDATA. As the second converter CVG2 performs an inverse Fourier transform on the frequency data FDATA, the frequency data FDATA, which has a frequency domain range, can be transformed into interferometric data HDATA, which has a spatial domain range.

[0107] After the compensator CPG multiplies the third frequency data FDATA3 by the phase term equivalent to the second compensation value CMP2 in the frequency domain to generate the third corrected data CDATA3, the output OTG performs an inverse Fourier transform on the frequency data FDATA generated based on the third corrected data CDATA3, thus generating data that considers d. x (Second lateral difference value) and d y Interference data HDATA (second longitudinal difference value).

[0108] The above description refers to preferred embodiments of the present invention. However, those skilled in the art or those of ordinary skill in the art should understand that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the invention as set forth in the claims.

[0109] Therefore, the technical scope of this invention is not limited to the contents described in the detailed specification, but should be determined only by the claims.

Claims

1. A hologram display apparatus comprising: a light generator that generates light; a spatial light modulator that forms an interference pattern to interfere the light; and a controller that supplies interference data for forming the interference pattern to the spatial light modulator, the spatial light modulator is formed of a plurality of pixels, and includes a first region that arranges a plurality of the pixels in a first pattern including only pixels in odd-numbered pixel rows of the spatial light modulator, and a second region that arranges a plurality of the pixels in a second pattern different from the first pattern including only pixels in even-numbered pixel rows of the spatial light modulator, the controller includes: a data generator that generates first interference data for the first region and second interference data for the second region; a compensator that outputs first correction data generated based on the first interference data and second correction data generated by correcting the second interference data with first difference values corresponding to position differences of the same color pixels between the first pattern and the second pattern; and an outputter that outputs the interference data based on the first correction data and the second correction data.

2. The hologram display apparatus according to claim 1, wherein the first difference values include a first lateral difference value defined by a difference between an average value of position data in a first direction of first reference pixels selected from a plurality of the pixels arranged in the first region and displaying the same color and an average value of position data in the first direction of second reference pixels selected from a plurality of the pixels arranged in the second region and displaying the same color as the first reference pixels, and a first longitudinal difference value defined by a difference between an average value of position data in a second direction perpendicular to the first direction of the first reference pixels and an average value of position data in the second direction of the second reference pixels.

3. The hologram display apparatus according to claim 1, wherein the compensator includes a first transformer that Fourier-transforms the first interference data to generate first frequency data and Fourier-transforms the second interference data to generate second frequency data, the compensator outputs the first frequency data as the first correction data.

4. The hologram display apparatus according to claim 3, wherein the compensator further includes a multiplier that multiplies a first compensation value determined according to the first difference values on the second frequency data to generate the second correction data.

5. The hologram display apparatus according to claim 4, wherein the outputter includes: a synthesizer that outputs frequency data based on the first correction data and the second correction data; and a second transformer that inverse-Fourier-transforms the frequency data to output the interference data.

6. The hologram display apparatus according to claim 1, wherein the spatial light modulator further includes a third region that arranges a plurality of the pixels in a third pattern different from the first pattern and the second pattern, the data generator generates third interference data for the third region, and the compensator outputs third correction data generated by correcting the third interference data with third difference values corresponding to position differences of the same color pixels between the first pattern and the third pattern and between the second pattern and the third pattern. The data generator also generates third interference data for the third region, The compensator corrects the third interference data using a second difference value obtained by comparing the first pattern and the third pattern, thereby also outputting third corrected data, The outputter outputs the interference data based on the first corrected data to the third corrected data.

7. The hologram display device of claim 6, wherein The first difference value includes a first lateral difference value defined by a difference between an average value of position data of first reference pixels selected from among a plurality of the pixels disposed in the first region and displaying the same color and an average value of position data of second reference pixels selected from among a plurality of the pixels disposed in the second region and displaying the same color as the first reference pixels in a first direction, and a first longitudinal difference value defined by a difference between an average value of position data of the first reference pixels and an average value of position data of the second reference pixels in a second direction perpendicular to the first direction, The second difference value includes a second lateral difference value defined by a difference between the average value of position data of the first reference pixels and an average value of position data of third reference pixels selected from among a plurality of the pixels disposed in the third region and displaying the same color as the first reference pixels in the first direction, and a second longitudinal difference value defined by a difference between the average value of position data of the first reference pixels and an average value of position data of the third reference pixels in the second direction.

8. The hologram display device of claim 7, wherein The compensator includes a first transformer that Fourier-transforms the first interference data to generate first frequency data, Fourier-transforms the second interference data to generate second frequency data, and Fourier-transforms the third interference data to generate third frequency data, The compensator outputs the first frequency data as the first corrected data.

9. The hologram display device of claim 8, wherein The compensator further includes: a first multiplier that multiplies the second frequency data by a first compensation value determined according to the first difference value to generate the second corrected data; and a second multiplier that multiplies the third frequency data by a second compensation value determined according to the second difference value to generate the third corrected data.

10. The hologram display device of claim 9, wherein The outputter includes: a synthesizer that outputs frequency data based on the first corrected data to the third corrected data; and a second transformer that inverse-Fourier-transforms the frequency data to output the interference data.

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