KR102117792B1 - Light source device - Google Patents

Abstract

Provided is a light source device with improved aesthetic sensibility. The light source device according to one embodiment of the present invention comprises: a light source providing light; a housing receiving the light source; and a cover film disposed on an optical path of the light provided from the light source. Moreover, the cover film includes a diffractive optical element layer.

Description

Light source device {LIGHT SOURCE DEVICE}

The present invention relates to a light source device.

Diffraction Optical Element (DOE) refers to a device capable of dispersing or concentrating light through a nano pattern. Recently, DOE technology has been applied to various fields. For example, DOE technology is used in manufacturing, medical, or printing industries.

With DOE, it is possible to control the dispersion of light while minimizing the loss of light, so various forms can be implemented using light. In addition, DOE can be used for the authenticity of the product due to the same difficulty in reproduction.

In addition, using DOE, it is possible to realize a complex pattern or design with light, so the advertising industry and the design industry are paying attention to the possibility. Under these circumstances, application technologies using DOE have been tried in various fields.

The problem to be solved by the present invention is to provide a light source device in which an optical image is viewed.

Another problem to be solved by the present invention is to provide a light source device that can be utilized for various purposes.

Another problem to be solved by the present invention is to provide a light source device with improved aesthetics.

The problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

A light source device according to an embodiment of the present invention for solving the above problems includes a light source that provides light, a housing in which the light source is disposed, and a cover film disposed on an optical path of light provided by the light source. The cover film includes a diffractive optical element layer.

In addition, the cover film is spaced apart by a first distance from the light source, the first distance may be 40mm to 100mm.

Further, the light source may include an LED light source.

Further, light provided from the light source may be diffracted by the cover film, thereby forming an optical image on the cover film.

In addition, the optical image may include any one or more selected from the group consisting of symbols, letters, figures, and numbers.

In addition, the cover film may include a curved surface, and the optical image may include a curved surface compensation image visually recognized on the curved surface.

In addition, the radius of curvature of the curved surface may be the same as the first distance,

Further, the number of the light sources is n, and the number of the light images may be recognized in correspondence to the number of the light sources.

In addition, the diffractive optical element layer may include a diffraction pattern having a random protrusion pattern.

In addition, the cover film may include at least partially a spherical surface.

In addition, the cover film may further include a planarization layer disposed on the diffractive optical element layer.

The means for solving the problem is not limited to this, and more specific means are described in more detail in the specification.

According to embodiments of the present invention, it is possible to provide a light source device in which an optical image is viewed.

In addition, it is possible to provide a light source device that can be used for billboards and the like.

Further, it is possible to provide a light source device with improved aesthetics.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the present specification.

1 is a schematic diagram schematically showing a light source device according to an embodiment of the present invention.
2 is a schematic diagram schematically showing a light source device according to an embodiment of the present invention.
3 is a cross-sectional view taken along line I-I' of FIG. 1.
4A is a partial cross-sectional view of a light source device according to an embodiment of the present invention.
4B is a partial cross-sectional view of a light source device according to an embodiment of the present invention.
5 is a schematic diagram of a light source device according to another embodiment of the present invention.
6 is a schematic diagram of a light source device according to another embodiment of the present invention.
7 is a schematic diagram of a light source device according to an embodiment of the present invention.
8 is a schematic diagram of a light source device according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims.

Elements or layers referred to as "on" or "on" of another element or layer are not only directly above the other component or layer, but also through other layers or other components in the middle. All inclusive. On the other hand, when the configuration is referred to as “directly on” or “directly above”, it indicates that no other configuration or layer is interposed in the middle.

The spatially relative terms "below", "beneath", "lower", "above", "on", "on", "upper ( upper)", etc. may be used to easily describe the correlation between one component or components and other components or components as illustrated in the drawings. Spatially relative terms should be understood as terms that include different directions of construction in use or operation in addition to the directions shown in the figures. For example, if the configuration shown in the figure is turned over, a configuration described as "below" of the other configuration may be placed "above" the other configuration. Also, a configuration described as being located on the "left" side of another configuration based on the drawings may be located on the "right side" of another configuration according to a viewpoint. Accordingly, the exemplary term “below” can include both the directions below and above. The configuration can also be oriented in other directions, in which case spatially relative terms can be interpreted according to the orientation.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical spirit of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Also, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, one or more other features or numbers, The existence or addition possibilities of steps, actions, components, parts or combinations thereof are not excluded in advance.

The same reference numerals are used for the same or similar parts throughout the specification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a schematic diagram schematically showing a light source device according to an embodiment of the present invention.

2 is a schematic diagram schematically showing a light source device according to an embodiment of the present invention.

1 and 2, a light source device according to an embodiment of the present invention includes a light source 100, a housing 200 and a cover film 300.

The light source 100 may emit light. The emitted light may be provided to the user through the cover film 300 to be described later.

In one embodiment, the light source 100 may be a point light source. In one embodiment, the light source device may include one light source 100. In another embodiment, the light source device may include a plurality of light sources 100. As described in detail later, the number of visible optical images 310 may correspond to the number of light sources 100. That is, in the embodiment with one light source 100, one optical image 310 is visible to the user, and in the embodiment with n light sources 100, n optical images 310 can be visually recognized by the user. have.

In one embodiment, the light source 100 may include a light emitting diode (LED) bulb. However, the present invention is not limited thereto, and the light source 100 may include all types of light sources that emit wavelengths in the visible light region.

In addition, when the light source 100 includes a light emitting diode (LED) bulb, the light source 100 may further include a brightness adjusting means (not shown) for adjusting the brightness of the LED bulb.

In one embodiment, the brightness control means may include a dimming controller that controls brightness by a current control method or a PWM (Pulse Width Modulation) method.

When the light source 100 is an LED bulb, the light source 100 may have a certain color. That is, the light source can emit light having one color selected from white, daylight, or light bulb color, which is an index of a general LED light bulb.

In one embodiment, the light source 100 may emit light having one or more colors selected from a color code. In the present specification,'color code' is a code for expressing colors as numbers, and may be one selected from RGB color codes, CMYK color codes, and HSB color codes.

When the light source 100 has a color, the light image 310 to be described later may be recognized as a color corresponding to the color of the light source 100. For example, when the light source 100 emits red light, the optical image 310 may be reddish to correspond thereto.

In addition, the light source 100 may change the color of the emitted light from one color to another color. For example, when the light emitted from the light source 100 is changed from red to green, the light image 310 may be changed from red to green correspondingly.

The light source 100 may be disposed in the housing 200. The housing 200 may accommodate various components necessary for driving the light source device, including the interior space. That is, the housing 200 may provide a space in which components including the light source 100 are disposed.

1 shows that the inner space of the housing 200 has a rectangular parallelepiped shape, the shape of the housing 200 is not limited thereto. That is, the housing 200 may be another housing 200 in one embodiment if it has a required internal space, and the scope of the present invention is not limited according to the shape of the housing 200.

In one embodiment, the interior space of the housing 200 may include a cylindrical shape.

That is, it can be understood that the inner space of the housing 200 includes all forms of a flat surface, a curved surface, or a combination thereof.

In one embodiment, the housing 200 may be made of a transparent and/or opaque material. The transparent material can be, for example, glass or plastic. The opaque material may include, for example, any one or more selected from plastic, rubber, silicon, metal, and polymer materials.

In one embodiment, the housing 200 may be entirely made of an opaque material, or entirely made of a transparent material, or partly made of a transparent material and partly made of an opaque material.

In one embodiment, the housing 200 may include an opening. Accordingly, light emitted from the light source 100 disposed inside the housing 200 may be transmitted to the user through the opening.

In an embodiment in which the housing 200 has an opening, the remaining surfaces of the housing 200 except for the opening may be made of an opaque material. In this case, the housing 200 may guide light provided from the light source 100 to be emitted only through the opening.

A cover film 300 may be disposed in the opening of the housing 200. The cover film 300 may be disposed on the light path P of light emitted from the light source 100.

In this specification, the term “light path” may mean a path of light provided from the light source 100. In general, since light is emitted from all directions in the light source 100, a plurality of light paths may be provided. However, for convenience of description in this specification, the light path may be used as a term referring to a path of light having a meaning among a plurality of lights.

In FIG. 1, the light path P may mean a path of light reaching the user 1000 through the cover film 300 among light emitted from the light source 100.

1 and 2, light provided from the light source 100 may be provided to the user 1000 (specifically, it may be the user's eye) through the cover film 300.

The cover film 300 may at least partially diffract light provided from the light source 100 to allow the user to visually recognize the optical image 310. That is, a part of the light provided from the light source 100 is transmitted and a part is reflected, and a part of the transmitted light is diffracted to form the optical image 310. Accordingly, an optical image 310 having a specific shape may be formed on the cover film 300.

The optical image 310 may have various sizes and shapes. In one embodiment, the optical image 310 may be a symbol, letter, figure, number, or a combination thereof.

In addition, the optical image 310 may include a trademark or logo of a specific company.

In addition, the optical image 310 may include design elements such as a specific pattern or pattern.

In one embodiment, the optical image 310 may be formed by a design algorithm using Fourier transform and Fourier inverse transform. In other words, the cover film 300 may be formed by including a diffractive optical element layer 350 so that a shape or an intended shape previously input by a design algorithm can be recognized as the optical image 310. The diffractive optical element layer 350 will be described in detail later.

In one embodiment, the light source 100 and the cover film 300 may be spaced apart by a first distance d1. The first distance d1 may be defined as a distance between the light source 100 and the inner surface of the cover film 300 (opposing the light source).

In one embodiment, the first distance d1 may be 40 mm to 100 mm. As described above, the optical image 310 is shaped by diffraction of light provided from the light source 100.

When the first distance d1 is less than 40 mm, the light provided from the light source 100 is not sufficiently diffracted, so that a previously input shape or an intended shape is not completely expressed.

In addition, when the first distance d1 exceeds 100 mm, the light provided from the light source 100 is scattered to blur or blur the outer periphery of the previously input shape or the intended shape.

As described above, when the first distance d1 is 40 mm to 100 mm, the light is sufficiently diffracted in a state of having a stable dispersion degree, and accordingly, a previously input shape or an intended shape can be completely recognized.

More specifically, the first distance d1 may be 40 mm to 80 mm. More specifically, the first distance d1 may be 40 mm to 60 mm. If the first distance (d1) is less than 40mm, the light is not sufficiently diffracted, the optical image 310 is not visible, and when the first distance (d1) is greater than 100mm, the diffraction of the light rapidly increases, The drawings to be formed become larger than necessary, and thus, it is impossible for the general public to identify what the designed drawings are at a glance.

Hereinafter, a cover film 300 according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a cross-sectional view taken along line I-I' of FIG. 1.

Referring to FIG. 3, the cover film 300 according to an embodiment may include a base 340 and a diffractive optical element layer 350.

In one embodiment, the base 340 may be a thin film having light transmittance.

In one embodiment, the base 340 may be made of plastic or a polymer material. For example, the base 340 may be made of PET, PP, PC, PMMA, or a combination thereof.

A diffractive optical element layer 350 may be disposed on the base 340. The diffractive optical element layer 350 may include a diffraction pattern.

In one embodiment, the diffraction pattern may have various shapes of nanoscale. For example, the diffraction pattern may include randomly formed protrusion and/or depression patterns. The size and height of each protruding and/or recessed pattern may be different from each other. The protruding and/or recessed pattern can be a stripe shape, a mosaic shape, a pyramid shape, or a combination thereof. The diffraction pattern may be defined as a pattern that induces diffraction characteristics to implement the optical image 310 through a design algorithm including a Fourier transform and a Fourier inverse transform process.

A specific light image 310 may be implemented by a diffraction pattern formed through a design algorithm. If the diffraction pattern is the same, the same optical image 310 can be implemented. However, the reverse may not hold true. That is, even in the case of the same optical image 310, the diffraction pattern may be formed differently. This is because the diffraction sun of light for realizing a specific image is not limited to one.

Since the diffraction pattern is nanoscale, it may be significantly difficult to replicate the diffraction pattern than to duplicate the light image 310. This characteristic can distinguish the genuine and the replica of the light source device. That is, even in a light source device that implements the same optical image 310, it is difficult to implement the diffraction pattern formed on the cover film 300 in the same way, and thus, by comparing the diffraction patterns of both, it is possible to reliably distinguish the genuine product from the replica. That is, the light source device according to some embodiments of the present invention can reliably distinguish a genuine product from a replica product, thereby preventing the replica product from damaging the value of the genuine product.

In one embodiment, the diffraction pattern may be formed by any one of a hot embossing process, a nano-imprinting process, transfer printing, laser transfer, atomic layer deposition, or chemical vapor deposition. However, this is exemplary, and of course, the diffraction pattern is not limited by the manufacturing method.

Hereinafter, a light source device according to another embodiment of the present invention will be described. In the following embodiments, the same components as those already described are referred to by the same reference numerals, and duplicate descriptions will be omitted or simplified.

4A is a partial cross-sectional view of a light source device according to an embodiment of the present invention.

4A, the cover film 301 according to an embodiment may further include a planarization layer 360.

In one embodiment, the planarization layer 360 may be formed on the diffractive optical element layer 350. The planarization layer 360 may entirely cover the diffractive optical element layer 350.

Through this, the planarization layer 360 may protect the diffractive optical element layer 350 from physical impact or moisture.

In one embodiment, the planarization layer 360 may be made of a light transmissive material. The light-transmitting material may be, for example, one or more selected from the group consisting of PVC, PMMA, PET, PT, acrylic and epoxy.

4B is a partial cross-sectional view of a light source device according to an embodiment of the present invention.

4B, in one embodiment, the cover film 302 may further include a metal oxide layer 370.

In one embodiment, the metal oxide layer 370 may be disposed on the diffractive optical element layer 350.

The metal oxide layer 370 may have a property of transmitting or reflecting light of a specific wavelength. When the metal oxide layer 370 is disposed on the diffractive optical element layer 350, by selectively transmitting only light having a specific wavelength, the visibility of the implemented light image 310 can be increased. In addition, only light of a specific wavelength can be selectively transmitted so that the optical image 310 can be implemented only with light of a specific wavelength. When the optical image 310 is implemented only with light of a specific wavelength, the optical image 310 may be recognized by using an external device that can recognize only light of a specific wavelength, and this may be used for security or activation.

In one embodiment, the metal oxide layer 370 is silicon oxide (SiOx), titanium oxide (TiOx), aluminum oxide (AlOx), tantalum oxide (TaOx), hafnium oxide (HfOx), zirconium oxide (ZrOx), indium zinc oxide It may include any one or more selected from the group consisting of (IZO) and indium tin oxide (IZO).

4B illustrates that the metal oxide layer 370 is formed on the planarization layer 360, but is not limited thereto. In another embodiment, the metal oxide layer 370 may be disposed directly on the diffractive optical element layer 350. That is, the planarization layer 360 may be omitted. When the planarization layer 360 is omitted, the metal oxide layer 370 may cover the diffractive optical element layer 350 protruded randomly. That is, the metal oxide layer 370 may cover the diffractive optical element layer 350 to function as a planarization film.

5 is a schematic diagram of a light source device according to another embodiment of the present invention.

Referring to FIG. 5, the cover film 303 may include a curved surface.

In one embodiment, the cover film 303 may include a convex curved surface. In this specification,'convex' means a shape protruding toward the user 1000, and'concave' may mean a shape recessed in a direction away from the user 1000,

In one embodiment, the inner surface of the cover film 303 may include a curved surface having a constant radius of curvature (R).

In one embodiment, the radius of curvature R is defined around the light source 100 and may be the same as the first distance d1. The first distance d1 may be 40 mm to 100 mm as described above. That is, the distance from the point on the curved surface included in the inner surface of the copper film 303 to the light source 100 may be the first distance d1.

As described above, when the first distance d1 is 40 mm to 100 mm, the light is sufficiently diffracted in a state having a stable dispersion degree, and accordingly, a pre-entered shape or an intended shape can be completely recognized.

However, since the optical image 310 is formed on the cover film 303, when the cover film 303 is curved, the optical image 310 may be recognized as a convexly curved shape.

In this case, there is a possibility that the identity of the previously input shape or the intended shape is distorted. In order to compensate for this, in one embodiment, the shape input to the cover film 303 or the intended shape may be a curved surface compensation image. Accordingly, the optical image 310 may visually recognize the curved compensation image to the user. When the curved compensation image is projected on a plane, it is recognized as concave or convex, but when projected on a convex or concave surface, it is recognized as a flat image. It can mean an image.

In an embodiment in which the cover film 303 includes a convex curved surface, the curved surface compensation image may be a convex curved surface compensation image recognized as a flat image when formed on the convex curved surface.

The convex curved surface compensation image can be formed by adding a variable for the curved surface to the design algorithm described above. That is, the diffraction pattern included in the diffractive optical element layer 350 may include a pattern in which diffraction characteristics are adjusted by reflecting the case where the light image 310 by diffraction is formed on a curved surface.

6 is a schematic diagram of a light source device according to another embodiment of the present invention.

Referring to FIG. 6, the cover film 304 may include a curved surface.

In one embodiment, the cover film 303 may include a concave curved surface. The definitions of convex and concave are as described above.

In one embodiment, the inner surface of the cover film 303 may include a curved surface having a constant radius of curvature (R).

In one embodiment, the radius of curvature R may be the same as the first distance d1.

In an embodiment in which the cover film 304 includes a concave surface, the first distance d1 may mean the shortest distance between the inner surface of the cover film 304 and the light source 100.

The first distance d1 may be 40 mm to 100 mm as described above. That is, the distance from one point on the curved surface included in the inner surface of the copper film 304 to the light source 100 may be the first distance d1.

As described above, when the first distance d1 is 40 mm to 100 mm, light is sufficiently diffracted in a state of having a stable dispersion degree, and accordingly, a previously input shape or an intended shape can be completely recognized. More specifically, the first distance d1 may be 40 mm to 80 mm. More specifically, the first distance d1 may be 40 mm to 60 mm. If the first distance (d1) is less than 40mm, the light is not sufficiently diffracted, the optical image 310 is not visible, and when the first distance (d1) is greater than 100mm, the diffraction of the light is rapidly increased, The drawings to be formed become larger than necessary, and thus, it is impossible for the general public to identify what the designed drawings are at a glance.

However, since the optical image 310 is formed on the cover film 304, when the cover film 304 is curved, the optical image 310 may be recognized as a concavely curved shape.

In this case, there is a possibility that the identity of the previously input shape or the intended shape is distorted. To compensate for this, in one embodiment, the shape or the intended shape input to the cover film 304 may be a curved surface compensation image. Accordingly, the optical image 310 may visually recognize the curved compensation image to the user. When the curved compensation image is projected on a plane, it is recognized as concave or convex, but when projected on a convex or concave surface, it is recognized as a flat image. It can mean an image.

In an embodiment in which the cover film 304 includes a concave curved surface, the curved surface compensation image may be a concave curved surface compensation image recognized as a flat image when formed on the concave curved surface.

The concave curved surface compensation image can be formed by adding a variable for the curved surface to the design algorithm described above. That is, the diffraction pattern included in the diffractive optical element layer 350 may include a pattern in which diffraction characteristics are adjusted by reflecting the case where the light image 310 by diffraction is formed on a curved surface.

7 is a schematic diagram of a light source device according to an embodiment of the present invention.

Referring to FIG. 7, in one embodiment, the cover film 305 may include a spherical surface. 7 shows the case where the cover film 305 is hemispherical. However, this is an example and is not limited thereto. That is, in other embodiments, the cover film 305 may be formed to include a complete spherical surface, a semi-spherical surface, or a portion of a spherical surface.

In one embodiment, a cover film 305 may be disposed on the housing 201. The housing 201 may provide a space in which the light source 100 is disposed. That is, the light source 100 may be disposed in a space defined by the housing 201 and the cover film 305.

When the cover film 305 includes a spherical surface as shown in FIG. 7, the optical image 310 may be viewed at a 360-degree radius around the light source 100. That is, since the light provided from the light source 100 is emitted in all directions, and the emitted light is provided to the user 1000 while having each light path P, the light source 100 is centered at a 360-degree radius. The located user can view the optical image 310.

When the light source device is installed as shown in FIG. 7, the light source device may be used as a billboard, sign, or warning sign in addition to the role of lighting. That is, since the logo, trademark, design, warning, advertisement copy, catch phrase guide, and the like can be recognized by the light source device, the light source device according to one embodiment may be used as a billboard,

5 and 6, when the cover film 305 includes a curved surface, the optical image 310 may be distorted by the curved surface, or a shape input to the cover film 305 to compensate for this, or The intended shape may be a curved surface compensation image. Accordingly, the optical image 310 may visually recognize the curved compensation image to the user. When the curved compensation image is projected on a plane, it is recognized as a curved shape, but when projected on a spherical surface, it refers to an image recognized as a flat image. can do.

In an embodiment in which the cover film 305 includes a spherical surface, the curved surface compensation image may be a spherical compensation image recognized as a flat image when formed on the spherical surface.

The spherical compensation image can be formed by adding a variable for the spherical surface to the design algorithm described above. That is, the diffraction pattern included in the diffractive optical element layer 350 may include a pattern in which diffraction characteristics are adjusted by reflecting the case where the light image 310 by diffraction is formed on a spherical surface.

8 is a schematic diagram of a light source device according to an embodiment of the present invention.

Referring to FIG. 8, in one embodiment, a plurality of light sources may be provided.

For convenience of description, the light source will be referred to as a first light source 101 and a second light source 102. 8 illustrates a case where there are two light sources, but the number of light sources is not limited thereto. That is, in another embodiment, there may be n light sources. (n is an integer)

In one embodiment, the first light source 101 and the second light source 102 may be disposed in the housing 200.

In one embodiment, the first light source 101 provides light to the user 1000 along the first light path P1, and the second light source 102 is the user 1000 along the second light path P2. Can provide light to,

Since the first optical path P1 and the second optical path P2 are different, the user 1000 may recognize the first optical image 311 and the second optical image 312. In the optical image, since the light provided by the light source is diffracted and visually recognized by the user according to the diffraction, the number of optical images may correspond to the number of point light sources.

That is, when there are n light sources, the user 1000 may recognize n light images.

In an embodiment, when the first light source 101 and the second light source 102 are the same, the corresponding first light image 311 and the second light image 312 may be substantially the same.

In another embodiment, when the first light source 101 and the second light source 102 emit light of different colors, the first light image 311 and the second light image 312 are different colors to correspond to this. You can measure

In another embodiment, when the sizes of the first light source 101 and the second light source 102 are different, the first light image 311 and the second light image 312 may have different sizes to correspond thereto. ,

That is, when n different light sources are disposed, a shape in which a specific pattern is repeated, a shape in which various colors are mixed, etc. may be implemented as an optical image. This can improve the aesthetic sense of the optical image expressed by the light source device.

The embodiments of the present invention have been mainly described above, but this is merely an example and does not limit the present invention, and a person having ordinary knowledge in the field to which the present invention belongs does not depart from the essential characteristics of the embodiments of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible. For example, each component specifically shown in the embodiments of the present invention can be implemented by modification. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

200: housing
100: light source
300: cover film
310: optical image

Claims (11)

A light source providing light;
A housing in which the light source is disposed; And
It includes; a cover film disposed on the light path of the light provided by the light source;
The cover film includes a diffractive optical element layer,
The cover film and the light source are separated by a first distance, the first distance is 40mm to 100mm,
The number of light sources is n, and a light source device in which the number of light images is recognized n corresponding to the number of light sources. According to claim 1,
The light source is a light source device comprising an LED light source. According to claim 1,
The light provided by the light source is diffracted by the cover film to form an optical image on the cover film. According to claim 3,
The optical image is a light source device including any one or more selected from the group consisting of symbols, letters, figures, and numbers. According to claim 3,
The cover film includes a curved surface, and the light image includes a curved surface compensation image visually recognized on the curved surface. The method of claim 5,
A light source device having a curvature radius of the curved surface equal to the first distance. delete According to claim 1,
The diffractive optical element layer is a light source device comprising a diffraction pattern having a random protrusion pattern. According to claim 1,
Wherein the cover film comprises at least partially a spherical surface. According to claim 1,
The cover film further comprises a planarization layer disposed on the diffractive optical element layer. According to claim 1,
The cover film further comprises a metal oxide layer disposed on the diffractive optical element layer.

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