Holographic display device

Abstract

A holographic display device is disclosed, the holographic display device comprising: a light source unit generating light; a spatial light modulation panel spatially modulating the light received from the light source unit and generating diffracted light; and an optical unit generating a holographic image using the diffracted light. The spatial light modulation panel comprises a first color filter, a second color filter, and a third color filter. The number of the second color filters is greater than the number of each of the first color filters and the third color filters. During the on state of the spatial light modulation panel, the shortest distance between the second color images displayed through the second color filter in a predetermined direction is substantially equal to the shortest distance between the first color images displayed through the first color filter in the predetermined direction and the shortest distance between the third color images displayed through the third color filter in the predetermined direction.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority benefit of Korean Patent Application No. 10-2019-0101293 filed in the Korean Intellectual Property Office on August 19, 2019, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] Embodiments of the present disclosure relate to a holographic display device. More specifically, embodiments of the present disclosure relate to a holographic display device using a spatial light modulation method. Background Art

[0004] Three-dimensional (3D) image technology using a hologram method has attracted widespread attention as a next-generation 3D image technology that should eventually be achieved, because 3D image technology based on holograms can fundamentally avoid visual fatigue of a stereoscopic method that relies on binocular parallax to perceive 3D images. In the case of holographic images, since users see actual 3D image formation with their own eyes, unlike conventional methods that use illusions to obtain 3D effects, users experience 3D effects that are substantially the same as seeing real things. Therefore, even if users may watch 3D images for a long time, the hologram method does not cause significant visual fatigue.

[0005] Recently, hologram technology using a digital hologram method has attracted much attention. The digital hologram method uses a spatial light modulator, and the performance of the spatial light modulator is an important factor in determining the performance of a hologram.

[0006] A liquid crystal display panel is used as a spatial light modulator, and the pixel size and the distance between pixels of the liquid crystal display panel determine the size and viewing angle of the holographic image in the holographic display. Summary of the invention

[0007] Embodiments of the present disclosure provide a holographic display device capable of preventing distortion of a holographic image caused by chromatic aberration.

[0008] An embodiment of the present inventive concept provides a holographic display device, which includes: a light source unit that generates light; a spatial light modulation panel that spatially modulates the light received from the light source unit and generates diffracted light; and an optical unit that generates a holographic image using the diffracted light. The spatial light modulation panel includes a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters. The number of second color filters is greater than the number of each of the first color filters and the third color filters. During the on-state of the spatial light modulation panel, the shortest distance in a predetermined direction between the second color images displayed through the first group of second color filters is substantially equal to the shortest distance in the predetermined direction between the first color images displayed through the first color filters and the shortest distance in the predetermined direction between the third color images displayed through the third color filters. During the on-state of the spatial light modulation panel, a black grayscale image is displayed through the second group of second color filters.

[0009] The spatial light modulation panel includes a plurality of pixels, and each of the pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel.

[0010] The first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel correspond to one first color filter, one third color filter, and two second color filters.

[0011] During an on-state of the spatial light modulation panel, one of the two sub-pixels corresponding to the two second color filters displays the second color image, and the other of the two sub-pixels corresponding to the two second color filters displays a black grayscale image.

[0012] The holographic display device also includes a controller for controlling the spatial light modulation panel. The controller receives first sub-pixel data, second sub-pixel data, third sub-pixel data, and fourth sub-pixel data corresponding to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, respectively, and includes a black grayscale converter that converts sub-pixel data corresponding to one of two sub-pixels corresponding to the two second color filters among the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel into black grayscale data.

[0013] The first subpixel corresponds to a first color filter, the second subpixel is adjacent to the first subpixel in the first direction and corresponds to one of the two second color filters, the third subpixel is adjacent to the first subpixel in the second direction and corresponds to a third color filter, and the fourth subpixel is adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction and corresponds to the other of the two second color filters.

[0014] During an on-state of the spatial light modulation panel, one of the second subpixel and the fourth subpixel displays a second color image, and the other of the second subpixel and the fourth subpixel displays a black grayscale image.

[0015] The second sub-pixel has a different area from the fourth sub-pixel.

[0016] The area of ​​the second sub-pixel is greater than that of the fourth sub-pixel, and during an on-state of the spatial light modulation panel, the second sub-pixel displays a second color image and the fourth sub-pixel displays a black grayscale image.

[0017] During an on-state of the spatial light modulation panel, the second sub-pixel and the fourth sub-pixel alternately display a black grayscale image every at least one frame.

[0018] During an on-state of the spatial light modulation panel, the second sub-pixel and the fourth sub-pixel display a second color image.

[0019] The spatial light modulation panel includes multiple pixels, a first pixel among the multiple pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and a second pixel among the multiple pixels adjacent to the first pixel in a first direction includes a fifth sub-pixel, a sixth sub-pixel, a seventh sub-pixel and an eighth sub-pixel.

[0020] The first subpixel, the second subpixel, the third subpixel and the fourth subpixel correspond to one first color filter, one third color filter and two second color filters, and the fifth subpixel, the sixth subpixel, the seventh subpixel and the eighth subpixel correspond to one first color filter, one third color filter and two second color filters.

[0021] The first subpixel corresponds to a first color filter, the second subpixel is adjacent to the first subpixel in the first direction and corresponds to one of the two second color filters, the third subpixel is adjacent to the first subpixel in the second direction and corresponds to a third color filter, and the fourth subpixel is adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction and corresponds to the other of the two second color filters.

[0022] The fifth subpixel corresponds to a third color filter, the sixth subpixel is adjacent to the fifth subpixel in the first direction and corresponds to one of the two second color filters, the seventh subpixel is adjacent to the fifth subpixel in the second direction and corresponds to one of the first color filters, and the eighth subpixel is adjacent to the sixth subpixel in the second direction and adjacent to the seventh subpixel in the first direction and corresponds to the other of the two second color filters.

[0023] During an on-state of the spatial light modulation panel, when the second subpixel and the eighth subpixel display the second color image, the fourth subpixel and the sixth subpixel display a black grayscale image.

[0024] During an on-state of the spatial light modulation panel, when the second subpixel and the eighth subpixel display a black grayscale image, the fourth subpixel and the sixth subpixel display a second color image.

[0025] During the on-state of the spatial light modulation panel, the second and eighth sub-pixels display a black grayscale image alternately with the fourth and sixth sub-pixels every at least one frame.

[0026] During an on-state of the spatial light modulation panel, the shortest distance between the second color images in the first direction is substantially equal to the shortest distance between the first color images and the shortest distance between the third color images in the first direction.

[0027] During an on-state of the spatial light modulation panel, the shortest distance between the second color images in the second direction is substantially equal to the shortest distance between the first color images and the shortest distance between the third color images in the second direction.

[0028] The first color filter is a red filter, the second color filter is a green filter, and the third color filter is a blue filter.

[0029] The spatial light modulation panel is a liquid crystal display panel.

[0030] An embodiment of the inventive concept provides a holographic display device, including: a light source unit that generates light; a spatial light modulation panel that spatially modulates the light received from the light source unit and generates diffracted light; and an optical unit that generates a holographic image using the diffracted light. The spatial light modulation panel includes: a plurality of pixels, and each of the pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel; a plurality of first color filters; a plurality of second color filters, and a plurality of third color filters. The number of the second color filters is greater than the number of each of the first color filters and the third color filters, and during the on state of the spatial light modulation panel, the shortest distance between the second color images displayed by the first group of second color filters in a predetermined direction is substantially equal to the shortest distance between the first color images displayed by the first color filter in the predetermined direction and the shortest distance between the third color images displayed by the third color filter in the predetermined direction. The first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel correspond to one first color filter, one third color filter, and two second color filters.

[0031] During the on-state of the spatial light modulation panel, a black grayscale image is displayed through the second set of second color filters.

[0032] According to an embodiment of the holographic display apparatus, since the shortest horizontal distance and the shortest vertical distance from the first color image to the third color image are substantially equal to each other, color difference between the first color image to the third color image may be prevented from occurring.

[0033] In other words, the first to third color hologram images respectively corresponding to the first to third color images are located in the pupils of the observer's eyes, and thus, distortion of the hologram image caused by chromatic aberration may be prevented or reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a holographic display device according to an exemplary embodiment of the present disclosure.

[0035] Figure 2 Shows Figure 1 The working principle of the holographic display device shown in.

[0036] Figure 3 yes Figure 1 Block diagram of the spatial light modulation panel shown in .

[0037] Figure 4 A configuration of a spatial light modulation panel according to an exemplary embodiment of the present disclosure is shown.

[0038] Figure 5 is a block diagram of a controller according to an exemplary embodiment of the present disclosure.

[0039] Figure 6 Shows Figure 4 The on state of the spatial light modulation panel shown in .

[0040] Figure 7 A configuration of a spatial light modulation panel according to an exemplary embodiment of the present disclosure is shown.

[0041] Fig. 8A Shows Figure 7 The on state of the spatial light modulation panel shown in .

[0042] Figure 8B The first to third color hologram images in the pupil are shown.

[0043] Fig. 9 A configuration of a spatial light modulation panel according to an exemplary embodiment of the present disclosure is shown.

[0044] Fig.10 Shows Fig. 9The on state of the spatial light modulation panel shown in .

[0045] Fig.11A The output of the controller in the nth frame is shown.

[0046] Fig. 11B The output of the controller in the (n+1)th frame is shown.

[0047] Fig. 12A The on state of the spatial light modulation panel in the nth frame is shown.

[0048] Fig. 12B The on state of the spatial light modulation panel in the (n+1)th frame is shown.

[0049] Fig.13 is a block diagram of a controller and a data driver according to an exemplary embodiment of the present invention.

[0050] Fig.14 A configuration of a spatial light modulation panel according to an exemplary embodiment of the present disclosure is shown.

[0051] Fig.15 Shows Fig.14 The on state of the spatial light modulation panel shown in . DETAILED DESCRIPTION

[0052] In the present disclosure, it should be understood that when an element or layer is referred to as being "on," "connected to" or "coupled to" another element or layer, the element or layer may be directly on, connected to or coupled to the other element or layer, or intervening elements or layers may be present.

[0053] Throughout the text, the same reference numerals may refer to the same elements. In the drawings, in order to effectively describe the technical contents, the thickness, ratio and size of components may be exaggerated.

[0054] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0055] Figure 1 is a schematic diagram of a holographic display device 100 according to an exemplary embodiment of the present disclosure, and Figure 2 Shows Figure 1 The working principle of the holographic display device 100 shown in FIG.

[0056] Reference Figure 1 According to an embodiment, the holographic display apparatus 100 includes a light source unit 10 generating light, a spatial light modulation panel 20 spatially modulating light received from the light source unit 10 , and an optical unit 30 generating a holographic image 40 .

[0057] According to an embodiment, the light source unit 10 includes at least one light source. The light source unit 10 emits coherent surface light. The light source may be a laser or a light emitting diode that emits coherent light. The light source unit 10 includes a red laser, a green laser, and a blue laser or a red light emitting diode, a green light emitting diode, and a blue light emitting diode as its light source. In another embodiment, the light source unit 10 includes a white light source that emits white light. The light source unit 10 also includes an additional element so that light is emitted from the light source as surface light substantially perpendicular to the front surface of the spatial light modulation panel 20.

[0058] According to an embodiment, the spatial light modulation panel 20 receives light from the light source unit 10 and spatially modulates the light using an electro-optical effect. The spatial light modulation panel 20 spatially modulates the surface light incident thereto using a complex amplitude hologram. The spatial light modulation panel 20 is a transmissive liquid crystal display panel that includes a plurality of pixels arranged in a two-dimensional array.

[0059] According to an embodiment, the spatial light modulation panel 20 includes a plurality of pixels for displaying a hologram. Figures 4 to 15 The spatial light modulation panel 20 will be described in detail.

[0060] According to an embodiment, the optical unit 30 includes a lens to generate the holographic image 40 at an appropriate distance. Figure 1 and Figure 2 A structure is shown in which the optical unit 30 includes one field lens, however, the embodiments of the present disclosure are not limited thereto. In other words, in other embodiments, the optical unit 30 may include a plurality of lenses.

[0061] According to an embodiment, the optical unit 30 converges the diffracted light modulated by the spatial light modulation panel 20 onto the focal plane of the lens. Therefore, an observation window for observing the holographic image 40 is formed at the position of the observer by the optical unit 30. The distance between pixels in the spatial light modulation panel 20 is a variable that can be used to determine the diffraction angle of the diffracted light. In the case where the shortest distances between color sub-pixels in a predetermined direction are different from each other, when a color hologram is generated, a holographic image of a specific color is located outside the pupils of the observer's eyes RE and LE, and as a result, the holographic image may be distorted due to chromatic aberration.

[0062] Hereinafter, a method of allowing the shortest distances between color sub-pixels in a predetermined direction to be identical to each other to prevent distortion of a holographic image caused by color aberration will be described.

[0063] Figure 3 yes Figure 1 , and Figure 4 The configuration of the spatial light modulation panel 20 according to an exemplary embodiment of the present disclosure is shown. Figure 5is a block diagram of a controller 50 according to an exemplary embodiment of the present disclosure, and Figure 6 Shows Figure 4 The turned-on state of the spatial light modulation panel 20 is shown in FIG.

[0064] Reference Figure 3 According to an embodiment, the holographic display device 100 further includes drivers 61 and 62 driving the spatial light modulation panel 20 and a controller 50 controlling operations of the drivers 61 and 62 .

[0065] According to an embodiment, the spatial light modulation panel 20 further includes a plurality of pixels PX and a plurality of signal lines GL and DL connected to the pixels PX for driving the pixels PX. The pixels PX are arranged in a matrix along the first direction DR1 and the second direction DR2. The pixels PX are spaced apart from each other so that the pixels PX do not interfere with each other.

[0066] According to an embodiment, the pixels PX are independently driven by signal lines GL and DL. The signal lines GL and DL include a plurality of gate lines GL and a plurality of data lines DL. The gate lines GL extend in a first direction DR1, and the data lines DL extend in a second direction DR2 perpendicular to the first direction DR1. Each pixel PX includes a transistor, two transparent electrodes, and a liquid crystal layer inserted between the two transparent electrodes. The transistor is connected to the corresponding gate line GL and the corresponding data line DL to control the on / off state of each pixel PX. When each pixel PX is turned on, an electric field is formed between the two transparent electrodes, and the transmittance of the liquid crystal layer varies according to the intensity of the electric field, thereby controlling the transmittance of the light received from the light source unit 10.

[0067] According to an embodiment, the drivers 61 and 62 include a gate driver 61 and a data driver 62. The gate driver 61 is connected to the gate line GL to drive the gate line GL, and the data driver 62 is connected to the data line DL to drive the data line DL.

[0068] According to an embodiment, the controller 50 controls operations of the spatial light modulation panel 20 and the drivers 61 and 62 .

[0069] Reference Figure 4 According to an embodiment, the spatial light modulation panel 20 includes a pixel array unit 21 and a color filter unit 22 .

[0070] According to an embodiment, the pixel array unit 21 includes pixels PX arranged in a matrix form. The pixels PX are arranged in a first direction DR1 and a second direction DR2. Each pixel PX includes a first sub-pixel SPX1, a second sub-pixel SPX2, a third sub-pixel SPX3, and a fourth sub-pixel SPX4. The first sub-pixel SPX1, the second sub-pixel SPX2, the third sub-pixel SPX3, and the fourth sub-pixel SPX4 are each smaller than the pixel PX. Since the pixel PX is divided into four sub-pixels SPX1, SPX2, SPX3, and SPX4, the resolution of the spatial light modulation panel 20 is improved.

[0071] According to an embodiment, the second subpixel SPX2 is disposed adjacent to the first subpixel SPX1 in the first direction DR1, and the third subpixel SPX3 is disposed adjacent to the first subpixel SPX1 in the second direction DR2. The fourth subpixel SPX4 is disposed adjacent to the second subpixel SPX2 in the second direction DR2, and the fourth subpixel SPX4 is disposed adjacent to the third subpixel SPX3 in the first direction DR1.

[0072] According to an embodiment, the color filter unit 22 includes a plurality of first color filters R, a plurality of second color filters G1 and G2, and a plurality of third color filters B. In the present exemplary embodiment, the number of the second color filters G1 and G2 is greater than the number of each of the first color filters R and the third color filters B. In an embodiment of the present disclosure, the first color filter R is a red filter, the second color filters G1 and G2 are green filters, and the third color filter B is a blue filter.

[0073] According to an embodiment, the first to fourth subpixels SPX1 to SPX4 correspond to one first color filter R, one third color filter B, and two second color filters G1 and G2. In detail, the first subpixel SPX1 corresponds to one first color filter R, the second subpixel SPX2 corresponds to one second color filter G1, the third subpixel SPX3 corresponds to one third color filter B, and the fourth subpixel SPX4 corresponds to another second color filter G2.

[0074] Reference Figure 4 and Figure 5, the controller 50 receives data corresponding to each pixel PX. In detail, the controller 50 receives first sub-pixel data DR corresponding to the first sub-pixel SPX1, second sub-pixel data D-G1 corresponding to the second sub-pixel SPX2, third sub-pixel data DB corresponding to the third sub-pixel SPX3, and fourth sub-pixel data D-G2 corresponding to the fourth sub-pixel SPX4. The controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB, and sends the converted first sub-pixel data DR', the second sub-pixel data D-G1', and the third sub-pixel data D-B' to the data driver 62. In other words, the controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB, and does not convert the grayscale information of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB. The converted first sub-pixel data DR′, second sub-pixel data D-G1′, and third sub-pixel data DB′ have substantially the same grayscale information as the first sub-pixel data DR, second sub-pixel data D-G1, and third sub-pixel data DB.

[0075] For example, according to an embodiment, the controller 50 includes a black grayscale converter 51. The black grayscale converter 51 receives the fourth sub-pixel data D-G2, converts the fourth sub-pixel data D-G2 into black grayscale data D-Black, and outputs the black grayscale data D-Black. In other words, the black grayscale converter 51 converts the grayscale information of the fourth sub-pixel data D-G2 into black grayscale information to generate the black grayscale data D-Black.

[0076] Figure 5 An embodiment in which the black grayscale converter 51 converts the fourth sub-pixel data D-G2 into black grayscale data D-Black is shown as a representative example, however, the embodiments of the present disclosure are not limited thereto. In other words, in other embodiments, the black grayscale converter 51 may convert the sub-pixel data corresponding to one of the second sub-pixel data D-G1 and the fourth sub-pixel data D-G2 into black grayscale data D-Black. For example, the black grayscale converter 51 converts the second sub-pixel data D-G1 into black grayscale data D-Black. In this case, the controller 50 converts the data format of the fourth sub-pixel data D-G2 and outputs the fourth sub-pixel data without converting the grayscale information thereof.

[0077] Reference Figure 4 and Figure 6According to an embodiment, in the on state of the spatial light modulation panel 20, the first sub-pixel SPX1, the second sub-pixel SPX2, and the third sub-pixel SPX3 display colored images corresponding to the converted first sub-pixel data DR', the second sub-pixel data D-G1', and the third sub-pixel data D-B', respectively. However, the fourth sub-pixel SPX4 displays a black grayscale corresponding to the black grayscale data D-Black.

[0078] In an exemplary embodiment, the images displayed by the first sub-pixel SPX1, the second sub-pixel SPX2, and the third sub-pixel SPX3 are respectively referred to as a first color image IR, a second color image I-G1, and a third color image IB. In an embodiment of the present disclosure, the first color image IR is a red image, the second color image I-G1 is a green image, and the third color image IB is a blue image. In addition, the image displayed by the fourth sub-pixel SPX4 is referred to as a black grayscale image I-Black.

[0079] According to an embodiment, the first color images IR are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the first color images IR are spaced apart from each other by a first horizontal distance Hd1 in the first direction DR1, and by a first vertical distance Vd1 in the second direction DR2. The first horizontal distance Hd1 and the first vertical distance Vd1 may be equal to each other or may be different from each other.

[0080] According to an embodiment, the second color images I-G1 are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the second color images I-G1 are spaced apart from each other by a second horizontal distance Hd2 in the first direction DR1, and spaced apart from each other by a second vertical distance Vd2 in the second direction DR2. The second horizontal distance Hd2 is substantially equal to the first horizontal distance Hd1, and the second vertical distance Vd2 is substantially equal to the first vertical distance Vd1.

[0081] According to an embodiment, the third color images IB are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the third color images IB are spaced apart from each other by a third horizontal distance Hd3 in the first direction DR1, and spaced apart from each other by a third vertical distance Vd3 in the second direction DR2. The third horizontal distance Hd3 is substantially equal to the first horizontal distance Hd1 and the second horizontal distance Hd2, and the third vertical distance Vd3 is substantially equal to the first vertical distance Vd1 and the second vertical distance Vd2.

[0082] As described above, according to the embodiment, since the horizontal distances Hd1, Hd2, and Hd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other, and the vertical distances Vd1, Vd2, and Vd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other, the color difference between the first color image IR, the second color image I-G1, and the third color image IB can be prevented. Therefore, the distortion of the holographic image due to the color difference can be reduced.

[0083] Figure 7 shows a configuration of a spatial light modulation panel 25 according to an exemplary embodiment of the present disclosure, Fig. 8A Shows Figure 7 The spatial light modulation panel 25 is turned on as shown in FIG. Figure 8B The first color hologram image IR to the third color hologram image IB in the pupil EP are shown.

[0084] Reference Figure 7 According to an embodiment, the spatial light modulation panel 25 includes a pixel array unit 23 and a color filter unit 24 .

[0085] According to an embodiment, the pixel array unit 23 includes a plurality of first pixels PX1 arranged in odd columns and a plurality of second pixels PX2 arranged in even columns. The first pixel PX1 includes a first sub-pixel SPX1, a second sub-pixel SPX2, a third sub-pixel SPX3, and a fourth sub-pixel SPX4, and the second pixel PX2 includes a fifth sub-pixel SPX5, a sixth sub-pixel SPX6, a seventh sub-pixel SPX7, and an eighth sub-pixel SPX8. Since the first pixel PX1 is divided into four sub-pixels SPX1, SPX2, SPX3, and SPX4, and the second pixel PX2 is divided into four sub-pixels SPX5, SPX6, SPX7, and SPX8, the resolution of the spatial light modulation panel 25 is improved.

[0086] According to an embodiment, the second subpixel SPX2 is disposed adjacent to the first subpixel SPX1 in the first direction DR1, and the third subpixel SPX3 is disposed adjacent to the first subpixel SPX1 in the second direction DR2. The fourth subpixel SPX4 is disposed adjacent to the second subpixel SPX2 in the second direction DR2, and is disposed adjacent to the third subpixel SPX3 in the first direction DR1. The sixth subpixel SPX6 is disposed adjacent to the fifth subpixel SPX5 in the first direction DR1, and the seventh subpixel SPX7 is disposed adjacent to the fifth subpixel SPX5 in the second direction DR2. The eighth subpixel SPX8 is disposed adjacent to the sixth subpixel SPX6 in the second direction DR2, and is disposed adjacent to the seventh subpixel SPX7 in the first direction DR1.

[0087] According to an embodiment, the color filter unit 24 includes a plurality of first color filters R, a plurality of second color filters G1 and G2, and a plurality of third color filters B. The number of the second color filters G1 and G2 is greater than the number of each of the first color filters R and the third color filters B. For example, the first color filter R is a red filter, the second color filters G1 and G2 are green filters, and the third color filter B is a blue filter.

[0088] According to an embodiment, the first to fourth subpixels SPX1 to SPX4 correspond to one first color filter R, one third color filter B, and two second color filters G1 and G2. In detail, the first subpixel SPX1 corresponds to one first color filter R, the second subpixel SPX2 corresponds to one second color filter G1, the third subpixel SPX3 corresponds to one third color filter B, and the fourth subpixel SPX4 corresponds to another second color filter G2.

[0089] According to an embodiment, the fifth to eighth sub-pixels SPX5 to SPX8 correspond to one first color filter R, one third color filter B, and two second color filters G1 and G2. In detail, the fifth sub-pixel SPX5 corresponds to one third color filter B, the sixth sub-pixel SPX6 corresponds to one second color filter G2, the seventh sub-pixel SPX7 corresponds to one first color filter R, and the eighth sub-pixel SPX8 corresponds to another second color filter G1.

[0090] Reference Figure 3 , Figure 5 and Figure 7According to an embodiment, the controller 50 receives data corresponding to each of the first pixel PX1 and the second pixel PX2. In detail, the controller 50 receives the first sub-pixel data DR corresponding to the first sub-pixel SPX1 and the seventh sub-pixel SPX7, the second sub-pixel data D-G1 corresponding to the second sub-pixel SPX2 and the eighth sub-pixel SPX8, the third sub-pixel data DB corresponding to the third sub-pixel SPX3 and the fifth sub-pixel SPX5, and the fourth sub-pixel data D-G2 corresponding to the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6. The controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB, and sends the converted first sub-pixel data DR', the second sub-pixel data D-G1', and the third sub-pixel data DB to the data driver 62. In other words, the controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB, and does not convert the grayscale information of the first sub-pixel data DR, the second sub-pixel data D-G1, and the third sub-pixel data DB. The converted first sub-pixel data DR′, second sub-pixel data D-G1′, and third sub-pixel data DB′ have substantially the same grayscale information as the first sub-pixel data DR, second sub-pixel data D-G1, and third sub-pixel data DB.

[0091] According to an embodiment, the black grayscale converter 51 in the controller 50 receives the fourth sub-pixel data D-G2, converts the fourth sub-pixel data D-G2 into black grayscale data D-Black, and outputs the black grayscale data D-Black. In other words, the black grayscale converter 51 converts the grayscale information of the fourth sub-pixel data D-G2 into black grayscale information and generates the black grayscale data D-Black.

[0092] Reference Figure 5 , Figure 7 and Fig. 8A According to an embodiment, in the on state of the spatial light modulation panel 25, the first sub-pixel SPX1, the second sub-pixel SPX2 and the third sub-pixel SPX3 display colored images corresponding to the converted first sub-pixel data DR', the second sub-pixel data D-G1' and the third sub-pixel data D-B', respectively, and the fifth sub-pixel SPX5, the seventh sub-pixel SPX7 and the eighth sub-pixel SPX8 display colored images corresponding to the converted third sub-pixel data D-B', the first sub-pixel data DR' and the second sub-pixel data D-G1', respectively. The fourth sub-pixel SPX4 and the sixth sub-pixel SPX6 display a black grayscale image I-Black corresponding to the black grayscale data D-Black.

[0093] In an exemplary embodiment, the image displayed by the first sub-pixel SPX1 and the seventh sub-pixel SPX7 is referred to as a first color image IR, the image displayed by the second sub-pixel SPX2 and the eighth sub-pixel SPX8 is referred to as a second color image I-G1, and the image displayed by the third sub-pixel SPX3 and the fifth sub-pixel SPX5 is referred to as a third color image IB. In an embodiment of the present disclosure, the first color image IR is a red image, the second color image I-G1 is a green image, and the third color image IB is a blue image. In addition, the image displayed by the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6 is referred to as a black grayscale image I-Black.

[0094] In an exemplary embodiment, the first color images IR are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the first color images IR are spaced apart from each other by a first horizontal distance Hd1 in the first direction DR1, and by a first vertical distance Vd1 in the second direction DR2. The first horizontal distance Hd1 and the first vertical distance Vd1 may be equal to each other or may be different from each other.

[0095] In an exemplary embodiment, the second color images I-G1 are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the second color images I-G1 are spaced apart from each other by a second horizontal distance Hd2 in the first direction DR1, and spaced apart from each other by a second vertical distance Vd2 in the second direction DR2. The second horizontal distance Hd2 is substantially equal to the first horizontal distance Hd1, and the second vertical distance Vd2 is substantially equal to the first vertical distance Vd1.

[0096] In an exemplary embodiment, the third color images IB are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the third color images IB may be spaced apart from each other by a third horizontal distance Hd3 in the first direction DR1, and spaced apart from each other by a third vertical distance Vd3 in the second direction DR2. The third horizontal distance Hd3 is substantially equal to the first horizontal distance Hd1 and the second horizontal distance Hd2, and the third vertical distance Vd3 is substantially equal to the first vertical distance Vd1 and the second vertical distance Vd2.

[0097] As described above, according to an embodiment, since the horizontal distances Hd1, Hd2, and Hd3 of the first color image IR, the second color image I-G1, and the third color image IB are all equal to each other, and the vertical distances Vd1, Vd2, and Vd3 of the first color image IR, the second color image I-G1, and the third color image IB are all equal to each other, color differences between the first color image IR, the second color image I-G1, and the third color image IB are prevented from occurring.

[0098] In other words, if Fig. 8A and Figure 8B As shown in , according to an embodiment, a first color hologram image IR corresponding to a first color image IR, a second color hologram image IG corresponding to a second color image I-G1, and a third color hologram image IB corresponding to a third color image IB are located in a pupil EP of an observer. Therefore, distortion of a holographic image caused by chromatic aberration can be prevented or reduced.

[0099] Fig. 9 shows a configuration of a spatial light modulation panel 28 according to an exemplary embodiment of the present disclosure, and Fig.10 Shows Fig. 9 The turned-on state of the spatial light modulation panel 28 is shown in FIG.

[0100] Reference Fig. 9 and Fig.10 In the pixel array unit 26 of the spatial light modulation panel 28 according to the exemplary embodiment of the present disclosure, the second sub-pixel SPX2 is larger in size than the first sub-pixel SPX1 and the third sub-pixel SPX3, and the fourth sub-pixel SPX4 is smaller in size than the first sub-pixel SPX1 and the third sub-pixel SPX3. In addition, the sixth sub-pixel SPX6 is smaller in size than the fifth sub-pixel SPX5 and the seventh sub-pixel SPX7, and the eighth sub-pixel SPX8 is larger in size than the fifth sub-pixel SPX5 and the seventh sub-pixel SPX7.

[0101] According to an embodiment, the color filter unit 27 of the spatial light modulation panel 28 includes a second color filter G1 corresponding to the size of the second sub-pixel SPX2 and the eighth sub-pixel SPX8. In other words, the area of ​​the second color filter G1 corresponding to the second sub-pixel SPX2 and the eighth sub-pixel SPX8 is larger than the area of ​​the second color filter G2 corresponding to the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6. In addition, the area of ​​the second color filter G1 corresponding to the second sub-pixel SPX2 and the eighth sub-pixel SPX8 is larger than the area of ​​the first color filter R corresponding to the first sub-pixel SPX1 and the seventh sub-pixel SPX7 and the area of ​​the third color filter B corresponding to the third sub-pixel SPX3 and the fifth sub-pixel SPX5. Similarly, the area of ​​the second color filter G2 corresponding to the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6 is smaller than the area of ​​the first color filter R corresponding to the first sub-pixel SPX1 and the seventh sub-pixel SPX7 and the area of ​​the third color filter B corresponding to the third sub-pixel SPX3 and the fifth sub-pixel SPX5.

[0102] According to an embodiment, since the area of ​​the second color image I-G1 displayed by the second and eighth subpixels SPX2 and SPX8 becomes larger than that of the second color image I-G1 shown in FIG. 8 , the transmittance of the first and second pixels PX1 and PX2 increases.

[0103] However, if Fig.10 As shown in , according to an embodiment, since the horizontal distances Hd1, Hd2, and Hd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other, and the vertical distances Vd1, Vd2, and Vd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other, the color difference between the first color image IR, the second color image I-G1, and the third color image IB is prevented. Therefore, the transmittance of the holographic image is improved, and the distortion of the holographic image due to the color difference is reduced.

[0104] Fig.11A shows the output of the controller 50 in the nth frame Fn, and Fig. 11B The output of the controller 50 in the (n+1)th frame Fn+1 is shown. Fig. 12A The nth frame Fn is shown Figure 7 The spatial light modulation panel 25 is turned on as shown in FIG. Fig. 12B The (n+1)th frame Fn+1 is shown. Figure 7 The on state of the spatial light modulation panel 25 is shown in FIG.

[0105] Reference Figure 7 and Fig.11A According to an embodiment, the controller 50 outputs data for each pixel PX in units of one frame. Therefore, the spatial light modulation panel 25 displays a desired image in units of one frame.

[0106] According to an embodiment, the controller 50 receives first subpixel data DR corresponding to the first subpixel SPX1 and the seventh subpixel SPX7, second subpixel data D-G1 corresponding to the second subpixel SPX2 and the eighth subpixel SPX8, third subpixel data DB corresponding to the third subpixel SPX3 and the fifth subpixel SPX5, and fourth subpixel data D-G2 corresponding to the fourth subpixel SPX4 and the sixth subpixel SPX6.

[0107] According to an embodiment, in the nth frame Fn, the controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1 and the third sub-pixel data DB, and sends the converted first sub-pixel data DR', the second sub-pixel data D-G1' and the third sub-pixel data DB' to the data driver 62.

[0108] According to an embodiment, in the nth frame Fn, the black grayscale converter 51 in the controller 50 converts the fourth sub-pixel data D-G2 into black grayscale data D-Black and outputs the black grayscale data D-Black. In other words, the black grayscale converter 51 converts the grayscale information of the fourth sub-pixel data D-G2 into black grayscale information and generates the black grayscale data D-Black.

[0109] Reference Figure 7 and Fig. 11B According to an embodiment, in the (n+1)th frame Fn+1, the controller 50 converts the data formats of the first sub-pixel data DR, the third sub-pixel data DB and the fourth sub-pixel data D-G2, and sends the converted first sub-pixel data DR', the third sub-pixel data DB' and the fourth sub-pixel data D-G2' to the data driver 62.

[0110] In the (n+1)th frame Fn+1, according to an embodiment, the black grayscale converter 51 converts the second sub-pixel data D-G1 into black grayscale data D-Black and outputs the black grayscale data D-Black. In other words, the black grayscale converter 51 converts the grayscale information of the second sub-pixel data D-G1 into black grayscale information and generates the black grayscale data D-Black.

[0111] Reference Figure 7 , Fig.11A and Fig. 12A According to an embodiment, in the nth frame Fn, the first subpixel SPX1, the second subpixel SPX2 and the third subpixel SPX3 of the spatial light modulation panel 25 display colored images corresponding to the converted first subpixel data DR', the second subpixel data D-G1' and the third subpixel data D-B', respectively, and the fifth subpixel SPX5, the seventh subpixel SPX7 and the eighth subpixel SPX8 display colored images corresponding to the converted third subpixel data D-B', the first subpixel data DR' and the second subpixel data D-G1', respectively. The fourth subpixel SPX4 and the sixth subpixel SPX6 display a black grayscale image I-Black corresponding to the black grayscale data D-Black.

[0112] In the present exemplary embodiment, in the nth frame Fn, the image displayed by the first sub-pixel SPX1 and the seventh sub-pixel SPX7 is referred to as the first color image IR, the image displayed by the second sub-pixel SPX2 and the eighth sub-pixel SPX8 is referred to as the second color image I-G1, and the image displayed by the third sub-pixel SPX3 and the fifth sub-pixel SPX5 is referred to as the third color image IB. In the embodiment of the present disclosure, the first color image IR is a red image, the second color image I-G1 is a green image, and the third color image IB is a blue image. In addition, the image displayed by the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6 is referred to as a black grayscale image I-Black.

[0113] Reference Figure 7 , Fig. 11B and Fig. 12B According to an embodiment, in the (n+1)th frame Fn+1, the first subpixel SPX1, the third subpixel SPX3 and the fourth subpixel SPX4 of the spatial light modulation panel 25 display colored images corresponding to the converted first subpixel data DR', the third subpixel data DB' and the fourth subpixel data D-G2', respectively, and the fifth subpixel SPX5, the sixth subpixel SPX6 and the seventh subpixel SPX7 display colored images corresponding to the converted third subpixel data DB', the fourth subpixel data D-G2' and the first subpixel data DR', respectively. The second subpixel SPX2 and the eighth subpixel SPX8 display a black grayscale image I-Black corresponding to the black grayscale data D-Black.

[0114] In the present exemplary embodiment, in the (n+1)th frame Fn+1, the image displayed by the first sub-pixel SPX1 and the seventh sub-pixel SPX7 is referred to as the first color image IR, the image displayed by the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6 is referred to as the fourth color image I-G2, and the image displayed by the third sub-pixel SPX3 and the fifth sub-pixel SPX5 is referred to as the third color image IB. In an embodiment of the present disclosure, the first color image IR is a red image, the fourth color image I-G2 is a green image, and the third color image IB is a blue image. In addition, the image displayed by the second sub-pixel SPX2 and the eighth sub-pixel SPX8 is referred to as a black grayscale image I-Black.

[0115] like Fig. 12A and Fig. 12BAs shown in, according to an embodiment, the sub-pixel displaying the black grayscale image I-Black changes with each frame. In this exemplary embodiment, the sub-pixel displaying the black grayscale image I-Black changes in units of one frame, however, the embodiments of the present disclosure are not limited thereto. In another example of the present disclosure, the sub-pixel displaying the black grayscale image I-Black changes in units of two or more frames.

[0116] Reference Fig. 12A and Fig. 12B According to an embodiment, horizontal distances Hd1, Hd2, and Hd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other in each frame, and vertical distances Vd1, Vd2, and Vd3 of the first color image IR, the second color image I-G1, and the third color image IB are equal to each other in each frame. Therefore, color difference between the first color image IR, the second color image I-G1, and the third color image IB is prevented from occurring in each frame. Therefore, distortion of the holographic image caused by color difference is reduced.

[0117] Fig.13 is a block diagram of a controller 50 and a data driver 62 according to an exemplary embodiment of the present disclosure.

[0118] Reference Figure 7 and Fig.13 According to an embodiment, the controller 50 receives data corresponding to each of the first pixel PX1 and the second pixel PX2. In detail, the controller 50 receives first sub-pixel data DR corresponding to the first sub-pixel SPX1 and the seventh sub-pixel SPX7, second sub-pixel data D-G1 corresponding to the second sub-pixel SPX2 and the eighth sub-pixel SPX8, third sub-pixel data DB corresponding to the third sub-pixel SPX3 and the fifth sub-pixel SPX5, and fourth sub-pixel data D-G2 corresponding to the fourth sub-pixel SPX4 and the sixth sub-pixel SPX6.

[0119] According to an embodiment, the controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, the third sub-pixel data DB, and the fourth sub-pixel data D-G2, and transmits the converted first sub-pixel data DR', the second sub-pixel data D-G1', the third sub-pixel data DB', and the fourth sub-pixel data D-G2' to the data driver 62. In other words, the controller 50 converts the data formats of the first sub-pixel data DR, the second sub-pixel data D-G1, the third sub-pixel data DB, and the fourth sub-pixel data D-G2, and does not convert the grayscale information of the first sub-pixel data DR, the second sub-pixel data D-G1, the third sub-pixel data DB, and the fourth sub-pixel data D-G2. The converted first sub-pixel data DR', the second sub-pixel data D-G1', the third sub-pixel data DB, and the fourth sub-pixel data D-G2 have grayscale information substantially the same as that of the first sub-pixel data DR, the second sub-pixel data D-G1, the third sub-pixel data DB, and the fourth sub-pixel data D-G2.

[0120] According to an embodiment, the data driver 62 receives the converted first sub-pixel data DR', the second sub-pixel data D-G1', the third sub-pixel data D-B' and the fourth sub-pixel data D-G2' from the controller 50. The data driver 62 converts the converted first sub-pixel data DR', the second sub-pixel data D-G1' and the third sub-pixel data D-B' into the first data voltage Vd-R, the second data voltage Vd-G1 and the third data voltage Vd-B, respectively. The first data voltage Vd-R, the second data voltage Vd-G1 and the third data voltage Vd-B have voltage levels corresponding to the grayscale information of the converted first sub-pixel data DR', the second sub-pixel data D-G1' and the third sub-pixel data D-B', respectively.

[0121] In an embodiment of the present disclosure, the data driver 62 includes a black voltage converter 62a. The black voltage converter 62a receives the converted fourth sub-pixel data D-G2', converts the converted fourth sub-pixel data D-G2' into a black data voltage Vd-Black, and outputs the black data voltage Vd-Black. The black data voltage Vd-Black has a voltage level corresponding to a black grayscale.

[0122] Fig.13An embodiment in which the black voltage converter 62a converts the converted fourth sub-pixel data D-G2' into the black data voltage Vd-Black is shown as a representative example, however, the embodiments of the present invention are not limited thereto. In other words, in other embodiments, the black voltage converter 62a converts the sub-pixel data corresponding to one of the converted second sub-pixel data D-G1' and the fourth sub-pixel data D-G2' into the black data voltage Vd-Black. For example, in another embodiment, the black voltage converter 62a converts the converted second sub-pixel data D-G1' into the black data voltage Vd-Black. In this case, the data driver 62 converts the converted fourth sub-pixel data D-G2' into the fourth data voltage and outputs the fourth data voltage. The fourth data voltage has a voltage level corresponding to the grayscale information of the converted fourth sub-pixel data D-G2'.

[0123] Fig.14 shows a configuration of a spatial light modulation panel 29 according to an exemplary embodiment of the present disclosure, and Fig.15 Shows Fig.14 The turned-on state of the spatial light modulation panel 29 is shown in FIG.

[0124] Reference Fig.14 and Fig.15 , the spatial light modulation panel 29 according to the present exemplary embodiment includes a pixel array unit 21 ′ and a color filter unit 22 ′.

[0125] According to an embodiment, the pixel array unit 21' includes pixels PX arranged in a matrix form. The pixels PX are arranged in a first direction DR1 and a second direction DR2. Each pixel PX includes a first sub-pixel SPX1, a second sub-pixel SPX2, a third sub-pixel SPX3, and a fourth sub-pixel SPX4.

[0126] According to an embodiment, the second subpixel SPX2 is disposed adjacent to the first subpixel SPX1 in the first direction DR1, and the third subpixel SPX3 is disposed adjacent to the second subpixel SPX2 in the second direction DR2. The fourth subpixel SPX4 is disposed adjacent to the first subpixel SPX1 in the second direction DR2, and the fourth subpixel SPX4 is disposed adjacent to the third subpixel SPX3 in the first direction DR1.

[0127] According to an embodiment, the color filter unit 22' includes a plurality of first color filters R, a plurality of second color filters G1 and G2, and a plurality of third color filters B. In the present exemplary embodiment, the number of the second color filters G1 and G2 is greater than the number of each of the first color filters R and the third color filters B. In an embodiment of the present disclosure, the first color filter R is a red filter, the second color filters G1 and G2 are green filters, and the third color filter B is a blue filter.

[0128] According to an embodiment, the first to fourth subpixels SPX1 to SPX4 correspond to one first color filter R, one third color filter B, and two second color filters G1 and G2. In detail, the first subpixel SPX1 corresponds to one first color filter R, the second subpixel SPX2 corresponds to one second color filter G1, the third subpixel SPX3 corresponds to one third color filter B, and the fourth subpixel SPX4 corresponds to another second color filter G2.

[0129] Reference Fig.14 and Fig.15 According to an embodiment, in the on state of the spatial light modulation panel 29, the first sub-pixel SPX1, the second sub-pixel SPX2, the third sub-pixel SPX3 and the fourth sub-pixel SPX4 respectively display the first color image IR, the second color image I-G1, the third color image IB and the fourth color image I-G2. In an embodiment of the present disclosure, the first color image IR is a red image, the second color image I-G1 and the fourth color image I-G2 are green images, and the third color image IB is a blue image.

[0130] According to an embodiment, the first color images IR are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the first color images IR are spaced apart from each other by a first horizontal distance Hd1 in the first direction DR1, and by a first vertical distance Vd1 in the second direction DR2. The first horizontal distance Hd1 and the first vertical distance Vd1 may be equal to each other or may be different from each other.

[0131] According to an embodiment, the second color images I-G1 are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the second color images I-G1 are spaced apart from each other by a second horizontal distance Hd2 in the first direction DR1, and spaced apart from each other by a second vertical distance Vd2 in the second direction DR2. The second horizontal distance Hd2 is substantially equal to the first horizontal distance Hd1, and the second vertical distance Vd2 is substantially equal to the first vertical distance Vd1.

[0132] According to an embodiment, the third color images IB are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the third color images IB are spaced apart from each other by a third horizontal distance Hd3 in the first direction DR1, and spaced apart from each other by a third vertical distance Vd3 in the second direction DR2. The third horizontal distance Hd3 is substantially equal to the first horizontal distance Hd1 and the second horizontal distance Hd2, and the third vertical distance Vd3 is substantially equal to the first vertical distance Vd1 and the second vertical distance Vd2.

[0133] According to an embodiment, the fourth color images I-G2 are spaced apart from each other by a predetermined distance in the first direction DR1 and the second direction DR2. In other words, the fourth color images I-G2 are spaced apart from each other by a fourth horizontal distance Hd4 in the first direction DR1, and spaced apart from each other by a fourth vertical distance Vd4 in the second direction DR2. The fourth horizontal distance Hd4 is substantially equal to the first horizontal distance Hd1, the second horizontal distance Hd2, and the third horizontal distance Hd3, and the fourth vertical distance Vd4 is substantially equal to the first vertical distance Vd1, the second vertical distance Vd2, and the third vertical distance Vd3.

[0134] As described above, since the horizontal distances Hd1, Hd2, Hd3, and Hd4 of the first color image IR, the second color image I-G1, the third color image IB, and the fourth color image I-G2 are equal to each other, and the vertical distances Vd1, Vd2, Vd3, and Vd4 of the first color image IR, the second color image I-G1, the third color image IB, and the fourth color image I-G2 are equal to each other, color difference between the first color image IR, the second color image I-G1, the third color image IB, and the fourth color image I-G2 can be prevented. Therefore, the distortion of the holographic image caused by the color difference is reduced.

[0135] Although the exemplary embodiments of the present disclosure have been described, it should be understood that the embodiments of the present disclosure should not be limited to the exemplary embodiments, but a person of ordinary skill in the art may make various changes and modifications within the spirit and scope of the embodiments of the present disclosure claimed for protection by the appended claims. Therefore, the disclosed subject matter should not be limited to any single embodiment described herein, and the scope of the embodiments of the present invention should be determined according to the appended claims.

Claims

1. Holographic display device, including: a light source unit, generating light; a spatial light modulation panel for spatially modulating the light received from the light source unit and generating diffracted light; as well as an optical unit that generates a holographic image using the diffracted light, Wherein, the spatial light modulation panel comprises: a plurality of first color filters; a plurality of second color filters; and multiple third color filters, wherein the number of the second color filters is greater than the number of each of the first color filters and the third color filters, and during an on-state of the spatial light modulation panel, the shortest distance between the center points of the second color images displayed through the first group of the second color filters in the same predetermined direction is equal to the shortest distance between the center points of the first color images displayed through the first color filters in the same predetermined direction and the shortest distance between the center points of the third color images displayed through the third color filters in the same predetermined direction, and Wherein, during the on-state of the spatial light modulation panel, a black grayscale image is displayed through the second group of the second color filters.

2. The holographic display device according to claim 1, wherein: The spatial light modulation panel includes a plurality of pixels, and each of the pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and wherein the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel correspond to one first color filter among the plurality of first color filters, one third color filter among the plurality of third color filters and two second color filters among the plurality of second color filters.

3. The holographic display device according to claim 2, wherein: During the on-state of the spatial light modulation panel, one of the two sub-pixels corresponding to the two second color filters among the first sub-pixel, the second sub-pixel, the third sub-pixel and the fourth sub-pixel displays the second color image, and the other of the two sub-pixels corresponding to the two second color filters displays the black grayscale image.

4. The holographic display device according to claim 2, further comprising a controller for controlling the spatial light modulation panel, wherein: The controller receives first subpixel data, second subpixel data, third subpixel data and fourth subpixel data corresponding to the first subpixel, the second subpixel, the third subpixel and the fourth subpixel, respectively, and the controller includes a black grayscale converter, which converts the subpixel data corresponding to one of the two subpixels corresponding to the two second color filters among the first subpixel, the second subpixel, the third subpixel and the fourth subpixel into black grayscale data.

5. The holographic display device according to claim 2, wherein: The first sub-pixel corresponds to the one first color filter, the second sub-pixel is adjacent to the first sub-pixel in the first direction and corresponds to one of the two second color filters, the third sub-pixel is adjacent to the first sub-pixel in the second direction and corresponds to the one third color filter, and the fourth sub-pixel is adjacent to the second sub-pixel in the second direction and adjacent to the third sub-pixel in the first direction and corresponds to the other second color filter of the two second color filters.

6. The holographic display device according to claim 5, wherein: During the on-state of the spatial light modulation panel, one of the second subpixel and the fourth subpixel displays the second color image, and the other of the second subpixel and the fourth subpixel displays the black grayscale image.

7. The holographic display device according to claim 6, wherein: The second sub-pixel has a different area from that of the fourth sub-pixel.

8. The holographic display device according to claim 7, wherein: The area of ​​the second sub-pixel is greater than that of the fourth sub-pixel, and during the on-state of the spatial light modulation panel, the second sub-pixel displays the second color image and the fourth sub-pixel displays the black grayscale image.

9. The holographic display device according to claim 5, wherein: During the on-state of the spatial light modulation panel, the second sub-pixel and the fourth sub-pixel alternately display the black grayscale image every at least one frame.

10. The holographic display device according to claim 2, wherein: Among the first subpixel, the second subpixel, the third subpixel and the fourth subpixel, the first subpixel corresponds to the one first color filter, the second subpixel adjacent to the first subpixel in the first direction corresponds to one second color filter of the two second color filters, the third subpixel adjacent to the second subpixel in the second direction corresponds to the one third color filter, and the fourth subpixel adjacent to the first subpixel in the second direction and adjacent to the third subpixel in the first direction corresponds to the other second color filter of the two second color filters.

11. The holographic display device according to claim 10, wherein: During the on-state of the spatial light modulation panel, the second sub-pixel and the fourth sub-pixel display the second color image.

12. The holographic display device according to claim 1, wherein: The spatial light modulation panel includes a plurality of pixels, a first pixel among the plurality of pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel, and a second pixel among the plurality of pixels adjacent to the first pixel in a first direction includes a fifth sub-pixel, a sixth sub-pixel, a seventh sub-pixel and an eighth sub-pixel.

13. The holographic display device according to claim 12, wherein: The first subpixel, the second subpixel, the third subpixel and the fourth subpixel correspond to a first group of color filters, the first group of color filters including one first color filter among the multiple first color filters, one third color filter among the multiple third color filters, and two second color filters among the multiple second color filters, and the fifth subpixel, the sixth subpixel, the seventh subpixel and the eighth subpixel correspond to a second group of color filters, the second group of color filters including one first color filter among the multiple first color filters, one third color filter among the multiple third color filters, and two second color filters among the multiple second color filters.

14. The holographic display device according to claim 13, wherein: The first subpixel corresponds to the one first color filter in the first group of color filters, the second subpixel is adjacent to the first subpixel in the first direction and corresponds to one second color filter in the two second color filters in the first group of color filters, the third subpixel is adjacent to the first subpixel in the second direction and corresponds to the one third color filter in the first group of color filters, the fourth subpixel is adjacent to the second subpixel in the second direction and adjacent to the third subpixel in the first direction and corresponds to the other second color filter in the two second color filters in the first group of color filters, the fifth subpixel corresponds to the one third color filter in the second group of color filters, the sixth subpixel is adjacent to the fifth subpixel in the first direction and corresponds to one second color filter in the two second color filters in the second group of color filters, the seventh subpixel is adjacent to the fifth subpixel in the second direction and corresponds to the one first color filter in the second group of color filters, and the eighth subpixel is adjacent to the sixth subpixel in the second direction and adjacent to the seventh subpixel in the first direction and corresponds to the other second color filter in the two second color filters in the second group of color filters.

15. The holographic display device according to claim 14, wherein: During the on-state of the spatial light modulation panel, when the second subpixel and the eighth subpixel display the second color image, the fourth subpixel and the sixth subpixel display the black grayscale image, or when the second subpixel and the eighth subpixel display the black grayscale image, the fourth subpixel and the sixth subpixel display the second color image.

16. The holographic display device according to claim 14, wherein: During the on-state of the spatial light modulation panel, the second sub-pixel and the eighth sub-pixel display the black grayscale image alternately with the fourth sub-pixel and the sixth sub-pixel every at least one frame.

17. The holographic display device according to claim 1, wherein: During the on state of the spatial light modulation panel, the shortest distance between the center points of the second color image in the first direction is equal to the shortest distance between the center points of the first color image in the first direction and the shortest distance between the center points of the third color image in the first direction, and the shortest distance between the center points of the second color image in the second direction is equal to the shortest distance between the center points of the first color image in the second direction and the shortest distance between the center points of the third color image in the second direction.

Images