Optical filter, Display device including optical filter and Electronic device including the same

Abstract

An optical filter, a display device including an optical filter, and an electronic device having the same are provided. A display device including an optical filter according to some embodiments of the present invention includes a light source that outputs light, a spatial light modulator that modulates the phase or amplitude of the light output from the light source, and an optical filter that filters the light provided from the spatial light modulator. The optical filter includes a substrate, a first layer disposed on one surface of the substrate, a second layer disposed on the first layer, and a third layer disposed on the second layer. The first layer, the second layer, and the third layer each include different materials, the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and the third layer extends in a first direction and includes a plurality of structures arranged in a second direction perpendicular to the first direction.

Description

Technology Field

[0001] The present invention relates to an optical filter, a display device including an optical filter, and an electronic device equipped with the same. Background Technology

[0002] With the development of the information society, various types of display devices have been developed to display information. For example, Augmented Reality (AR) devices are display devices that overlay virtual images onto real-world images visible to the user. Another example is stereoscopic display devices, which separate and display left-eye and right-eye images to create a sense of depth based on binocular parallax. Yet another example is holographic display devices, which display three-dimensional images by providing information regarding amplitude and phase.

[0003] Spatial light modulators are used in holographic display devices. Spatial light modulators are classified into amplitude modulation, which modulates the amplitude of incident light to produce an output, and phase modulation, which modulates the phase of incident light to produce an output. In the case of spatial light modulators, conjugate noise and DC noise are generated in addition to the signal intended for the user. Accordingly, various methods are being researched to eliminate noise and provide only the signal to the user. The problem to be solved

[0004] The objective of the present invention is to provide an optical filter that filters noise generated in a spatial light modulator.

[0005] Another objective of the present invention is to provide a display device comprising an optical filter that filters noise generated in a spatial light modulator.

[0006] Another objective of the present invention is to provide an electronic device having a display device comprising an optical filter that filters noise generated in a spatial light modulator.

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

[0008] A display device including an optical filter according to some embodiments of the present invention for solving the above problem comprises a light source that outputs light, a spatial light modulator that modulates the phase or amplitude of the light output from the light source, and an optical filter that filters the light provided from the spatial light modulator, wherein the optical filter comprises a substrate, a first layer disposed on one surface of the substrate, a second layer disposed on the first layer, and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, and the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction.

[0009] The height of the second floor and the height of the third floor may be proportional to the height of the first floor.

[0010] The height of the first layer above may be 85 nm to 87 nm.

[0011] The height of the second layer above may be 78 nm to 80 nm.

[0012] The height of the third layer above may be 98 nm to 100 nm.

[0013] Each of the above plurality of structures may be spaced apart by a first interval in the second direction.

[0014] The height of the first layer, the height of the second layer, and the height of the third layer may be proportional to the first interval.

[0015] The first interval above may be 329 nm to 331 nm.

[0016] The width of each of the above plurality of structures may be half of the first distance.

[0017] On a plane, the ratio of the area where the plurality of structures are arranged to the area of ​​the third layer may be 0.48 to 0.52.

[0018] The above spatial light modulator may be a reflective spatial light modulator that reflects the light.

[0019] The above spatial light modulator may be a transmissive spatial light modulator that transmits the light.

[0020] The display device of an electronic device according to some embodiments of the present invention for solving the above problem comprises a light source that outputs light, a spatial light modulator that modulates the phase or amplitude of the light output from the light source, and an optical filter that filters the light provided from the spatial light modulator, wherein the optical filter comprises a substrate, a first layer disposed on one surface of the substrate, a second layer disposed on the first layer, and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, and the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction.

[0021] An optical filter according to some embodiments of the present invention for solving the above problem comprises a substrate, a first layer disposed on one surface of the substrate, a second layer disposed on the first layer, and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction.

[0022] The height of the second floor and the height of the third floor may be proportional to the height of the first floor.

[0023] The height of the first layer above may be 85 nm to 87 nm.

[0024] The height of the second layer above may be 78 nm to 80 nm.

[0025] The height of the third layer above may be 98 nm to 100 nm.

[0026] Each of the above plurality of structures may be spaced apart by a first interval in the second direction.

[0027] The first interval above may be 329 nm to 331 nm.

[0028] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0029] According to some embodiments of the present invention, an optical filter, a display device including an optical filter, and an electronic device equipped with the same, noise generated in a spatial light modulator can be effectively reduced by reflecting only light of a specific wavelength that is incident perpendicularly and transmitting the remaining light.

[0030] Conventionally, there were limitations in that the size of the display device increased and the optical system lengthened by using a lens with a long focal length to avoid noise or using multiple lenses and filters to filter noise. On the other hand, the optical filter of the present invention is very thin with a thickness of several hundred nanometers, which can facilitate the thinning of the display device.

[0031] In some embodiments of the present invention, when using a plurality of optical filters, the arrangement directions of a plurality of structures of the third layer are arranged to be different from each other, thereby allowing noise to be reflected without restrictions on polarization.

[0032] The effects according to the embodiments are not limited to those exemplified above, and a wider variety of effects are included in this specification. Brief explanation of the drawing

[0033] FIG. 1 is a perspective view of an optical filter according to some embodiments of the present invention. Figure 2 is a front view illustrating an example of the optical filter of Figure 1. FIG. 3 is a side view of a display device including an optical filter according to some embodiments of the present invention. Figure 4 is an illustrative diagram to explain an example of the second light of Figure 3. Figure 5 is a graph illustrating the transmittance and reflectance of the optical filter of Figure 1. FIGS. 6 to 8 are drawings for explaining transmission and reflection with respect to the angle of incidence for the optical filter of FIG. 1. FIG. 9 is a side view of a display device including an optical filter according to some embodiments of the present invention. FIG. 10 is a block diagram of an electronic device having a display device including an optical filter according to some embodiments of the present invention. FIG. 11 is an exemplary diagram of an electronic device having a display device including an optical filter according to some embodiments of the present invention. Specific details for implementing the invention

[0034] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0035] When elements or layers are referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and therefore the invention is not limited to the depicted details.

[0036] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0037] Specific embodiments will be described below with reference to the attached drawings.

[0038] FIG. 1 is a perspective view of an optical filter according to some embodiments of the present invention. FIG. 2 is a front view illustrating an example of the optical filter of FIG. 1.

[0039] Referring to FIGS. 1 and 2, an optical filter (10) according to some embodiments of the present invention comprises a substrate (SUB), a first layer (100), a second layer (200), and a third layer (300).

[0040] The substrate (SUB) may be made of a material with high transmittance, such as glass or plastic. The substrate (SUB) may be a rigid substrate and may be formed so that one side is flat.

[0041] The first layer (100) may be disposed on one side of a substrate (SUB). The first layer (100) may comprise yttrium oxide (Y2O3). The refractive index of the first layer (100) may be approximately 1.9371 to 1.9504. The refractive index of the first layer (100) may vary depending on the wavelength band passing through the first layer (100). For example, for red light with a wavelength of 639 nm, the refractive index of the first layer (100) may be 1.9412, for green light with a wavelength of 545 nm, the refractive index of the first layer (100) may be 1.9371, and for blue light with a wavelength of 488 nm, the refractive index of the first layer (100) may be 1.9504. However, the present embodiment is not limited to a specific wavelength band.

[0042] The first layer (100) may have a first height (h1). The first height (h1) may be, for example, 85 nm to 87 nm, but is not limited thereto.

[0043] The second layer (200) may be disposed on one side of the first layer (100). The planar shape of the second layer (200) may follow the planar shape of the first layer (100). For example, the planar shape of the second layer (200) and the planar shape of the first layer (100) may be square, but are not limited thereto. The second layer (200) may contain hafnium oxide (HfO2). The refractive index of the second layer (200) may be about 1.8943 to 1.9116. For example, the refractive index of the second layer (200) for red light with a wavelength of 639 nm may be 1.8943, the refractive index of the second layer (200) for green light with a wavelength of 545 nm may be 1.903, and the refractive index of the second layer (200) for blue light with a wavelength of 488 nm may be 1.9116. However, this embodiment is not limited to a specific wavelength band.

[0044] The second layer (200) may have a second height (h2). The second height (h2) may be, for example, 78 nm to 80 nm, but is not limited thereto.

[0045] The third layer (300) may be disposed on one side of the second layer (200). The third layer (300) may include a plurality of structures (ST) that are spaced apart in a first direction (X-axis direction) and extend in a second direction (Y-axis direction). The third layer (300) may include aluminum oxide (Al2O3). The refractive index of the third layer (300) may be 1.6769 to 1.6881. For example, the refractive index of the third layer (300) may be 1.6769 for red light with a wavelength of 639 nm, the refractive index of the third layer (300) may be 1.6829 for green light with a wavelength of 545 nm, and the refractive index of the third layer (300) may be 1.6881 for blue light with a wavelength of 488 nm. However, the present embodiment is not limited to a specific wavelength band.

[0046] The third layer (300) may have a third height (h3). The third height (h3) may be, for example, 98 nm to 100 nm, but is not limited thereto.

[0047] Each of the plurality of structures (ST) may be spaced apart by a first interval (PR) in a first direction (X-axis direction). Specifically, the distance between the left sides of each of the plurality of structures (ST) may be constant at the first interval (PR). For example, the first interval (PR) may be 299 nm to 301 nm.

[0048] The width (WT) of each of the plurality of structures (ST) may be half of the first gap (PR). For example, the width (WT) of each of the plurality of structures (ST) may be 150 nm, and the first gap (PR) may be 300 nm. As another example, the ratio of the area where the plurality of structures (ST) are placed to the area of ​​the third layer (300) may be 0.48 to 0.52.

[0049] The first height (h1), the second height (h2), the third height (h3), and the first gap (PR) can be modified to values ​​proportional to each other. For example, the first height (h1) may be 86 nm, the second height (h2) may be 79 nm, the third height (h3) may be 99 nm, and the first gap (PR) may be 300 nm.

[0050] As another example, the first height (h1), second height (h2), third height (h3), and first gap (PR) may be modified and implemented with values ​​1.1 times the value of the above example. In this case, the first height (h1) may be 94.6 nm, the second height (h2) may be 86.9 nm, the third height (h3) may be 108.9 nm, and the first gap (PR) may be 330 nm. When the first height (h1), second height (h2), third height (h3), and first gap (PR) are extended in this way, the wavelength of light reflected by the optical filter (10) may be extended.

[0051] As another example, the first height (h1), second height (h2), third height (h3), and first gap (PR) may be modified and implemented with a value 0.9 times that of the above example. In this case, the first height (h1) may be 77.4 nm, the second height (h2) may be 71.1 nm, the third height (h3) may be 89.1 nm, and the first gap (PR) may be 270 nm. When the first height (h1), second height (h2), third height (h3), and first gap (PR) are shortened in this way, the wavelength of light reflected by the optical filter (10) may be shortened.

[0052] The optical filter (10) of the present invention stacks a first layer (100), a second layer (200), and a third layer (300) with different refractive indices, and forms the third layer (300) in a stripe pattern, thereby allowing it to reflect only light of a specific wavelength, such as a photonic crystal.

[0053] FIG. 3 is a side view of a display device including an optical filter according to some embodiments of the present invention. Parts that overlap with the foregoing description are omitted or simplified, and the differences are explained in detail.

[0054] Referring to FIG. 3, a display device (DPa) according to some embodiments of the present invention may include a light source (LS), a spatial light modulator (SLM), and an optical filter (10).

[0055] The light source (LS) can output a first light (L0). For example, the light source (LS) may be a laser, but is not limited thereto. If the light source (LS) is a laser, the first light (L0) may be a phase-matched coherent light. The light source (LS) can output the first light (L0) in a fourth direction (D1).

[0056] A spatial light modulator (SLM) may be placed on one side of the light source (LS). The spatial light modulator (SLM) may be placed parallel to the light source (LS). A first light (L0) output from the light source (LS) may be supplied to the spatial light modulator (SLM). The first light (L0) may be incident perpendicularly on the spatial light modulator (SLM). The spatial light modulator (SLM) may output a second light (L1) by modulating the phase or amplitude of the first light (L0). The spatial light modulator (SLM) may output the second light (L1) in a fourth direction (D1).

[0057] Although the drawing illustrates a spatial light modulator (SLM) as a transmissive spatial light modulator that outputs a second light (L1) in the same direction as the propagation direction of the first light (L0), the present embodiment is not limited thereto. As another example, the spatial light modulator (SLM) may output the second light (L1) in a direction opposite to the propagation direction of the first light (L0). In this case, the spatial light modulator (SLM) may be a reflective spatial light modulator.

[0058] Although not shown in the drawing, a polarizing member may be additionally disposed between the light source (LS) and the spatial light modulator (SLM) or between the spatial light modulator (SLM) and the optical filter (10). Through the polarizing member, the optical filter (10) may receive light polarized in a specific direction.

[0059] An optical filter (10) may be disposed on one side of the spatial light modulator (SLM). At this time, the optical filter (10) may be disposed such that the third layer (300) faces the spatial light modulator (SLM). For example, a plurality of structures of the third layer (300) may be extended in the sixth direction (D3) and spaced apart from each other in the fifth direction (D2). The optical filter (10) may be disposed parallel to the spatial light modulator (SLM). The second light (L1) output from the spatial light modulator (SLM) may be provided to the optical filter (10). The second light (L1) may proceed in the fourth direction (D1).

[0060] The optical filter (10) can transmit (L2) or reflect (L3) a portion of the second light (L1). At this time, a portion of the second light (L1) may be incident perpendicularly on the optical filter (10). This will be described later with reference to FIGS. 4 to 9.

[0061] Figure 4 is an illustrative diagram to explain an example of the second light of Figure 3.

[0062] Referring to FIG. 4, the second light (L1) may include a signal (SGN), conjugate noise (NS_CJ), and direct current noise (NS_DC).

[0063] The signal (SGN) is a target intended to be provided to the user and may be a holographic image whose phase or amplitude is modulated by passing through a spatial light modulator (SLM). The signal (SGN) may be offset from the optical axis of the spatial light modulator (SLM). Accordingly, the signal (SGN) may be incident on the optical filter (10) at an angle.

[0064] Conjugate noise (NS_CJ) is an image in which the signal (SGN) is origin-symmetric with respect to the optical axis and can be generated by the imaginary part during the phase representation process of the hologram. Accordingly, conjugate noise (NS_CJ) can be incident obliquely on the optical filter (10). The distance between the signal (SGN) and the conjugate noise (NS_CJ) may vary depending on the spacing between pixels of the spatial light modulator (SLM).

[0065] DC noise (NS_DC) can be generated by unmodulated light from a spatial light modulator (SLM). The DC noise (NS_DC) may be located on the optical axis of the spatial light modulator (SLM). Accordingly, the DC noise (NS_DC) may be incident perpendicularly on the optical filter (10). Since the DC noise (NS_DC) is very bright, if the DC noise (NS_DC) is incident on the user's pupil, it may interfere with the user's observation of the signal (SGN).

[0066] The optical filter (10) of the present invention can reflect DC noise (NS_DC) from the incident second light (L1) and transmit the remaining light, which is the signal (SGN) and conjugate noise (NS_CJ). The conjugate noise (NS_CJ) can be filtered by a known method, such as being separated later through phase shift modulation using a carrier wave.

[0067] Figure 5 is a graph illustrating the transmittance and reflectance of the optical filter of Figure 1.

[0068] FIG. 5 illustrates the transmittance and reflectance of an optical filter (10) in which the first height (h1) is 86 nm, the second height (h2) is 79 nm, the third height (h3) is 99 nm, and the first gap (PR) is 300 nm. As the specific values ​​of the first height (h1), the second height (h2), the third height (h3), and the first gap (PR) change, the wavelength of light reflected by the optical filter (10) may change.

[0069] Referring to FIG. 5, the optical filter (10) can reflect three wavelengths in the visible light wavelength range of about 380 nm to 780 nm and transmit the rest.

[0070] For example, the optical filter (10) can reflect red light with a wavelength of 638.8 nm, green light with a wavelength of 545 nm, and blue light with a wavelength of 488 nm. Accordingly, the optical filter (10) can be used as a color filter that reflects light of a specific wavelength when light of a mixture of several wavelength bands is incident.

[0071] When the values ​​of the first height (h1), second height (h2), third height (h3) and first interval (PR) increase, the wavelengths of the red light, green light, and blue light reflected by the optical filter (10) can be increased.

[0072] Conversely, when the values ​​of the first height (h1), second height (h2), third height (h3) and first interval (PR) are reduced, the wavelengths of the red light, green light, and blue light reflected by the optical filter (10) may be shortened.

[0073] FIGS. 6 to 8 are drawings for explaining transmission and reflection with respect to the angle of incidence for the optical filter of FIG. 1.

[0074] FIG. 6 is a diagram illustrating transmitted light and reflected light when the angle between the optical axis of the second light (L1) incident on the optical filter (10) and the normal of the optical filter (10) is 0°, that is, the angle of incidence is 0° and the light is incident perpendicularly.

[0075] FIG. 7 is a drawing illustrating transmitted light and reflected light when the angle between the optical axis of the second light (L1) incident on the optical filter (10) and the normal of the optical filter (10) is 0.2°, that is, the angle of incidence is 0.2°.

[0076] FIG. 8 is a diagram illustrating transmitted light and reflected light when the angle between the optical axis of the second light (L1) incident on the optical filter (10) and the normal of the optical filter (10) is 0.5°, that is, the angle of incidence is 0.5°.

[0077] Referring to FIG. 6, in the case of the second light (L1) that is incident perpendicularly, there is almost no light passing through the optical filter (10).

[0078] Referring to FIG. 7, when the angle of incidence is 0.2°, the optical filter (10) can transmit part of the light and reflect the remaining part.

[0079] Referring to FIG. 8, when the angle of incidence is 0.5°, the intensity of the transmitted light transmitted by the optical filter (10) is further increased compared to FIG. 7, and the intensity of the reflected light reflected by the optical filter (10) can be decreased compared to FIG. 7.

[0080] Accordingly, the optical filter (10) of the present invention can reflect light incident perpendicularly (e.g., DC noise) and transmit light incident obliquely (e.g., signal or conjugate noise).

[0081] FIG. 9 is a side view of a display device including an optical filter according to some embodiments of the present invention. Parts that overlap with the foregoing description are omitted or simplified, and the differences are explained in detail.

[0082] Referring to FIG. 9, a display device (DPb) according to some embodiments of the present invention may include a light source (LS), a spatial light modulator (SLM), a first optical filter (10a), and a second optical filter (10b).

[0083] The light source (LS), spatial light modulator (SLM), and first optical filter (10a) may be substantially the same as those described above in FIG. 3. Accordingly, the description will be omitted.

[0084] The second optical filter (10b) may include a substrate (SUB), a first layer (100), a second layer (200), and a third layer (300). The second optical filter (10b) may be formed in the same way as the first optical filter (10a). Specifically, the first height of the first layer (100) of the second optical filter (10b) may be the same as the first height (h1) of the first layer (100) of the first optical filter (10a). The second height of the second layer (200) of the second optical filter (10b) may be the same as the second height (h2) of the second layer (200) of the first optical filter (10a). The third height of the third layer (300) of the second optical filter (10b) may be the same as the third height (h3) of the third layer (300) of the first optical filter (10a). The first spacing of the third layer (300) of the second optical filter (10b) may be the same as the first spacing (PR) of the third layer (300) of the first optical filter (10a).

[0085] The second optical filter (10b) may be positioned so that the third layer (300) of the second optical filter (10b) faces the first optical filter (10a). The second optical filter (10b) may be positioned parallel to the first optical filter (10a).

[0086] The second optical filter (10b) may be arranged such that the extension direction of a plurality of structures in the third layer (300) of the second optical filter (10b) is different from the extension direction of a plurality of structures (ST) in the third layer (300) of the first optical filter (10a).

[0087] For example, when a plurality of structures of the third layer (300) of the first optical filter (10a) extend in the sixth direction (D3), the first optical filter (10a) can reflect incident light that is vertically polarized (TE mode; transverse electric field). The first optical filter (10a) can reflect the fourth light (L3) that is vertically polarized with respect to the second light (L1) that is not polarized, and transmit the remaining light, the third light (L2).

[0088] Subsequently, when a plurality of structures of the third layer (300) of the second optical filter (10b) extend in a fifth direction (D2) perpendicular to the sixth direction (D3), the second optical filter (10b) can reflect incident light that is horizontally polarized (TM mode; transverse magnetic field). With respect to the third light (L2), the second optical filter (10b) can reflect the sixth light (L5), which is horizontally polarized, and transmit the remaining fifth light (L4).

[0089] In this way, when optical filters (10a, 10b) with different extension directions of a plurality of structures of the third layer (300) are arranged in parallel, direct current noise (NS_DC) can be reflected without restrictions on the polarization direction of light provided from the spatial light modulator (SLM).

[0090] FIG. 10 is a block diagram of an electronic device having a display device including an optical filter according to some embodiments of the present invention.

[0091] Referring to FIG. 10, an electronic device (1) according to some embodiments of the present invention may include a display module (11), a processor (12), a memory (13), and a power module (14).

[0092] The processor (12) may include at least one of a central processing unit (CPU), an application processor (AP), a graphic processing unit (GPU), a communication processor (CP), an image signal processor (ISP), and a controller.

[0093] The memory (15) may store data information necessary for the operation of the processor (12) or the display module (11). When the processor (12) executes an application stored in the memory (15), a video data signal and / or an input control signal is transmitted to the display module (11), and the display module (11) can process the received signal and output video information through a display screen.

[0094] The power module (14) may include a power supply module, such as a power adapter or battery device, and a power conversion module that converts the power supplied by the power supply module to generate power required for the operation of the electronic device (1).

[0095] At least one of each component of the electronic device (1) described above may be included in a display device according to the embodiments described above. Additionally, some of the individual modules functionally included in one module may be included in the display device, while others may be provided separately from the display device. For example, the display device may include a display module (11), and the processor (12), memory (13), and power module (14) may be provided in the form of other devices within the electronic device (1) other than the display device.

[0096] FIG. 11 is an exemplary diagram of an electronic device having a display device including an optical filter according to some embodiments of the present invention.

[0097] Referring to FIG. 11, various electronic devices to which a display device according to the embodiments is applied may include not only image display electronic devices such as a smartphone (10_1a), tablet PC (10_1b), laptop (10_1c), TV (10_1d), and desk monitor (10_1e), but also wearable electronic devices including display modules such as smart glasses (10_2a), head-mounted display (10_2b), and smart watch (10_2c), and automotive electronic devices (10_3) including display modules such as a CID (Center Information Display) and room mirror display placed on the instrument panel, center fascia, and dashboard of a car.

[0098] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing the technical concept or essential features thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0099] 10: Optical filter SUB: Substrate 100: 1st floor 200: 2nd floor 300: 3rd floor ST: Multiple structures

Claims

Claim 1 A display device comprising: a light source for outputting light; a spatial light modulator for modulating the phase or amplitude of light output from the light source; and an optical filter for filtering light provided from the spatial light modulator, wherein the optical filter comprises: a substrate; a first layer disposed on one surface of the substrate; a second layer disposed on the first layer; and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, wherein the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and wherein the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction. Claim 2 A display device according to claim 1, wherein the height of the second layer and the height of the third layer are proportional to the height of the first layer. Claim 3 A display device according to claim 2, wherein the height of the first layer is 85 nm to 87 nm. Claim 4 A display device according to claim 2, wherein the height of the second layer is 78 nm to 80 nm. Claim 5 A display device according to claim 2, wherein the height of the third layer is 98 nm to 100 nm. Claim 6 In claim 1, each of the plurality of structures is arranged spaced apart by a first interval in the second direction. Claim 7 In claim 6, a display device in which the height of the first layer, the height of the second layer, and the height of the third layer are proportional to the first interval. Claim 8 In claim 6, the display device wherein the first interval is 329 nm to 331 nm. Claim 9 In claim 6, a display device in which the width of each of the plurality of structures is half the first distance. Claim 10 A display device according to claim 6, wherein, on a plane, the ratio of the area on which the plurality of structures are arranged to the area of ​​the third layer is 0.48 to 0.

52. Claim 11 In claim 1, the spatial light modulator is a reflective spatial light modulator that reflects the light, and the display device. Claim 12 In claim 1, the spatial light modulator is a transmissive spatial light modulator that transmits the light, and the display device. Claim 13 An electronic device comprising a display device, wherein the display device comprises: a light source for outputting light; a spatial light modulator for modulating the phase or amplitude of light output from the light source; and an optical filter for filtering light provided from the spatial light modulator, wherein the optical filter comprises: a substrate; a first layer disposed on one surface of the substrate; a second layer disposed on the first layer; and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, wherein the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and wherein the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction. Claim 14 An optical filter comprising: a substrate; a first layer disposed on one surface of the substrate; a second layer disposed on the first layer; and a third layer disposed on the second layer, wherein the first layer, the second layer, and the third layer comprise different materials, the height of the first layer, the height of the second layer, and the height of the third layer are different from each other, and the third layer extends in a first direction and comprises a plurality of structures arranged in a second direction perpendicular to the first direction. Claim 15 In claim 14, an optical filter in which the height of the second layer and the height of the third layer are proportional to the height of the first layer. Claim 16 An optical filter according to claim 15, wherein the height of the first layer is 85 nm to 87 nm. Claim 17 An optical filter according to claim 15, wherein the height of the second layer is 78 nm to 80 nm. Claim 18 An optical filter according to claim 15, wherein the height of the third layer is 98 nm to 100 nm. Claim 19 In claim 14, each of the plurality of structures is an optical filter spaced apart by a first interval in the second direction. Claim 20 In claim 19, the optical filter wherein the first interval is 329 nm to 331 nm.

Images