KR20230092455A - Display apparatus and head mounted display apparatus - Google Patents

Abstract

A display device according to an embodiment of the present specification includes a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions, and light emitted from the plurality of light emitting regions disposed on the display panel. and a light diffusion film that diffuses light to the non-emission area by partially absorbing and emitting light. Here, the light diffusion film may include a base film and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed.

Description

Display device and head mounted display device {DISPLAY APPARATUS AND HEAD MOUNTED DISPLAY APPARATUS}

The present specification relates to a display device and a head mounted display device, and more particularly, to a display device capable of improving a screen door effect and a head mounted display device including the same.

A near-eye display (NED) device may be worn by a user for augmented reality (AR) experiences and virtual reality (VR) experiences. The near eye display device may be included in a head-mounted display (HMD) device. A head mounted display device having a near eye display device may take various forms such as a helmet, glasses and goggles.

In general, in order to implement a head mounted display device, a display device for displaying an image and a lens for enlarging the image to be recognized by a user are required. Accordingly, a wide viewing angle can be implemented with a relatively small-sized display device.

However, since an image is implemented at a position very close to a user's eye in a conventional near-eye display device, a light-blocking area (or non-light-emitting area) between sub-pixels (or pixels) of the display device is conspicuously recognized. Accordingly, there is a problem in that a screen door effect, which is felt as if there is a grid in an image implemented in a conventional near-eye display device, occurs.

Conventionally, a haze film is attached to the surface of the display device to improve the screen door effect. Although the screen door effect can be improved by using a haze film having a high haze rate, a large amount of light diffused into a light-shielding area (or a non-light-emitting area) causes the image to be perceived as blurry (image blurring). The haze film contains polymer beads, etc., and irregularities are formed on the surface of the haze film due to the polymer beads, etc., and the lens effect occurs on the light emitted from the display panel due to the irregularities on the surface. A sparkling phenomenon appears (sparkling phenomenon).

Accordingly, the inventors of the present specification invented a light diffusion film capable of improving the screen door effect without image blurring and sparkling, and a display device to which the light diffusion film is applied.

An object to be solved according to embodiments of the present specification is to provide a display device capable of improving a screen door effect without image blurring and sparkling, and a head mounted display device including the same.

The problems to be solved according to the embodiments of the present specification are not limited to the above-mentioned problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the description below.

A display device according to an embodiment of the present specification includes a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions, and light emitted from the plurality of light emitting regions disposed on the display panel. and a light diffusion film that diffuses light to the non-emission area by partially absorbing and emitting light. The light diffusion film may include a base film and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed.

A head mounted display device according to an embodiment of the present specification includes a display device, a lens unit disposed between the display device and the user's eyeball, and a frame that accommodates the display device and the lens unit and can be worn on the user's head. include Here, the display device includes a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions, and disposed on the display panel to absorb some of the light emitted from the plurality of light emitting regions. A light diffusion film may include a base film and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed.

Other embodiment specifics are included in the detailed description and drawings.

According to an embodiment of the present specification, a screen door effect can be improved without image blurring and sparkling by attaching a light diffusion film including a light diffusion layer in which light emitting materials are dispersed to the surface of a display panel. Devices can be implemented.

According to the embodiments of the present specification, the color gamut of the display device may be improved by adjusting the content of the light emitting materials in the light diffusion layer within a predetermined range.

According to the embodiments of the present specification, the user's eyes can be protected by including the UV absorber in the light diffusion layer.

According to an embodiment of the present invention, a display device in which a light diffusion film including a light diffusion layer in which light emitting materials are dispersed is attached to the surface of a display panel is employed, thereby preventing image blurring and sparkling effects, and a screen door effect. A head mounted display device capable of improving can be implemented.

Effects of the present specification are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a cross-sectional view illustrating a display device according to an exemplary embodiment of the present specification.
2 is a cross-sectional view illustrating a display device according to another exemplary embodiment of the present specification.
FIG. 3 is a cross-sectional view illustrating a display device to which a liquid crystal display panel is applied as the display panel shown in FIG. 1 .
FIG. 4 is a cross-sectional view illustrating a display device using an organic light emitting display panel having a white light emitting layer as the display panel shown in FIG. 1 .
FIG. 5 is a cross-sectional view illustrating a display device to which the organic light emitting display panel shown in FIG. 1 and having red, green, and blue organic light emitting layers is applied.
6a and 6b show images of a conventional display device to which no haze film is applied.
7A and 7B show images of a display device to which a haze film is applied as a comparative example.
8A and 8B show images of a display device according to an embodiment of the present invention.
9 is a perspective view schematically illustrating a head mounted display device according to an embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described with '~on', '~upper', '~lower', 'next to', etc., 'right' Or, unless 'directly' is used, one or more other parts may be located between the two parts.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numbers designate like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, and as a person skilled in the art can fully understand, various interlocking and driving operations are possible, and each embodiment can be implemented independently of each other. It may or may be implemented together in an association relationship.

Hereinafter, a display device according to an embodiment of the present specification will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view illustrating a display device according to an exemplary embodiment of the present specification.

Referring to FIG. 1 , a display device according to an embodiment of the present specification includes a display panel 100 and a light diffusion film 200 attached to the display panel 100 .

The display panel 100 may be a liquid crystal display panel, an organic light emitting display panel, or a micro LED display panel.

The display panel 100 may include a plurality of light emitting areas and non-light emitting areas therebetween. A plurality of light emitting regions may be a plurality of subpixels. In the display panel 100, three sub-pixels or four sub-pixels may constitute one pixel.

The light diffusion film 200 is disposed on the entire surface of the display panel 100 and absorbs some of the light emitted from the plurality of light emitting areas to emit light, thereby diffusing the light to the non-light emitting areas.

The light diffusion film 200 may include a base film 220, a light diffusion layer 210 provided on one surface of the base film 220, and a surface treatment layer 230 provided on the other surface of the base film 220. .

The base film 220 may be a transparent film capable of transmitting light.

The light diffusion layer 210 is an adhesive layer and may be directly attached to one surface of the display panel 100, for example, the light emission surface. The light diffusion layer 210 may include a matrix resin 212 and light emitting materials 214 dispersed in the matrix resin 212 .

The matrix resin 212 may be made of an acrylic or urethane adhesive.

The light emitting materials 214 may emit light by absorbing some of the light emitted from the plurality of light emitting regions of the display panel 100 . The light emitting materials 214 disposed near or in the non-light emitting area absorb some of the light emitted from the plurality of light emitting areas of the display panel 100 and then emit light again, so that light is emitted even in the non-light emitting area. this can be released. Accordingly, the light-diffusing layer 210 causes the light-emitting areas to expand and the non-light-emitting areas to shrink. That is, the screen door effect of the display panel 100 can be improved due to the light diffusion layer 210 . And, since the light diffusion layer 210 includes a light emitting material and has no surface irregularities, it does not generate a sparkling effect.

The light emitting materials 214 may include an organic light emitting material, an inorganic light emitting material, or a combination thereof. The light emitting materials 214 may include a fluorescent material made of an organic material, or a quantum dot or quantum rod made of an inorganic material. Light-emitting materials 214 may include a combination of fluorescent materials, quantum dots, or quantum rods.

The light emitting materials 214 may include at least one of a red light emitting material, a green light emitting material, or a blue light emitting material. In order to provide additional optical characteristics while improving the screen door effect, for example, a red light emitting material, a green light emitting material, or a blue light emitting material may be mixed and used to improve color gamut. Mixing ratios thereof may be applied differently depending on emission wavelength characteristics of a display device to which the light diffusion layer is to be applied. For example, the light emitting materials 214 may include a red light emitting material, a green light emitting material, and a blue light emitting material in a predetermined ratio. For example, the light emitting materials 214 may include a red light emitting material and a green light emitting material in a predetermined ratio. For example, the light emitting materials 214 may include a red light emitting material and a blue light emitting material in a predetermined ratio. For example, the light emitting materials 214 may include a red light emitting material in a predetermined ratio. The red light emitting material emits red light with a wavelength of 600 nm to 650 nm, the green light emitting material emits green light with a wavelength of 500 nm to 580 nm, and the blue light emitting material emits blue light with a wavelength of 440 nm to 480 nm. can emit.

The content of the light emitting materials 214 in the light diffusion layer 210 may range from 1 wt% to 8 wt%. By adjusting the content of the red light emitting material, the green light emitting material, or the blue light emitting material within the range of 1 wt% to 8 wt%, the screen door effect of the image displayed on the display panel 100 can be improved, and the display panel ( 100), the color gamut may be improved by adjusting the peak wavelength of red light, green light, or blue light emitted.

If the content of the light emitting materials 214 is less than 1 wt%, the screen door effect for the user is not improved. If the content of the light emitting materials 214 exceeds 8 wt %, the screen door effect is improved, but color coordinates of light emitted from the display panel 100 are distorted, and the color gamut of the display panel 100 may deteriorate.

The light diffusion layer 210 may further include an ultraviolet absorber that absorbs a wavelength of 400 nm or less to protect the user's eyes. UV absorbers include at least one of benzotriazole-based, benzophenone-based, salicylic acid-based, salicylate-based, cyanoacrylate-based, cinnamate-based, oxanilide-based, polystyrene-based, azomethine-based, and triazine-based and is not limited thereto.

The thickness of the light diffusion layer 210 may range from 10 μm to 200 μm, preferably from 15 μm to 50 μm.

The surface treatment layer 230 may include at least one of a hard coating layer, an anti-glare layer, an anti-reflection layer, and an anti-bacteria layer. The hard coating layer may include an acrylic resin layer having a hardness of 3H or more, and the anti-glare layer may have a haze rate of 25% or less and an acrylic resin layer in which polymer particles are dispersed. The anti-reflection layer may have a structure in which a high refractive index layer and a low refractive index layer are stacked. The anti-bacterial layer may be a fluorine-based coating layer. When the light diffusion layer 210 does not include a UV absorber, the surface treatment layer 230 may include a UV absorber.

2 is a cross-sectional view illustrating a display device according to another exemplary embodiment of the present specification.

Referring to FIG. 2 , a display device according to another embodiment of the present specification includes a display panel 100 and a light diffusion film 200' attached to the display panel 100 .

The light diffusion film 200 ′ is disposed on the entire surface of the display panel 100 and absorbs some of the light emitted from the plurality of light emitting areas to emit light, thereby diffusing the light to the non-light emitting areas.

The light diffusion film 200' includes a base film 220, a light diffusion layer 210' provided on one surface of the base film 220, an adhesive layer 250 provided on one surface of the light diffusion layer 210', and a base film. It may include a surface treatment layer 230 provided on the other surface of (220).

The light diffusion layer 210' may be attached to one surface of the display panel 100, for example, the light emission surface by the adhesive layer 250'. The light diffusion layer 210' may include a matrix resin 212' and light emitting materials 214 dispersed in the matrix resin 212'.

The matrix resin 212' may include an acrylic resin and a photocuring agent. Photocuring agents include epoxy-based or amine-based. The matrix resin 212' is in a photocured state and may not have tackiness.

Since the light emitting materials 214 are the same as the light emitting materials 214 shown in FIG. 1, a detailed description thereof will be omitted.

The light emitting materials 214 may emit light by absorbing some of the light emitted from the plurality of light emitting regions of the display panel 100 . The light emitting materials 214 disposed near or in the non-light emitting area absorb some of the light emitted from the plurality of light emitting areas of the display panel 100 and then emit light again, so that light is emitted even in the non-light emitting area. this can be released. Accordingly, the light-diffusing layer 210' causes the light-emitting areas to expand and the non-light-emitting areas to shrink. That is, the screen door effect of the display panel 100 can be improved due to the light diffusion layer 210'. And, since the light diffusion layer 210' includes a light emitting material and has no surface irregularities, it does not generate a sparkling effect.

The content of the light emitting materials 214 in the light diffusion layer 210' may range from 1 wt% to 8 wt%. By adjusting the content of the red light emitting material, the green light emitting material, or the blue light emitting material within the range of 1 wt% to 8 wt%, the screen door effect of the image displayed on the display panel 100 can be improved, and the display panel ( 100), the color gamut may be improved by adjusting the peak wavelength of red light, green light, or blue light emitted.

If the content of the light emitting materials 214 is less than 1 wt%, the screen door effect for the user is not improved. If the content of the light emitting materials 214 exceeds 8 wt%, the screen door effect is improved, but the color coordinates of the light emitted from the display panel 100 may be undesirably distorted and the color gamut of the display panel 100 may deteriorate.

The light diffusion layer 210' may further include an ultraviolet absorber that absorbs a wavelength of 400 nm or less to protect the user's eyes. UV absorbers include at least one of benzotriazole-based, benzophenone-based, salicylic acid-based, salicylate-based, cyanoacrylate-based, cinnamate-based, oxanilide-based, polystyrene-based, azomethine-based, and triazine-based and is not limited thereto.

The thickness of the light diffusion layer 210' may range from 1 μm to 15 μm, preferably from 3 μm to 10 μm.

Since the surface treatment layer 230 is the same as the surface treatment layer 230 shown in FIG. 1, a detailed description thereof will be omitted.

FIG. 3 is a cross-sectional view illustrating a display device to which a liquid crystal display panel is applied as the display panel shown in FIG. 1 .

The display device shown in FIG. 3 includes a light diffusion film 200 disposed on a liquid crystal display panel 130 .

The liquid crystal display panel 130 includes a color filter array 150 and a thin film transistor array 160 facing each other with a liquid crystal layer 188 therebetween.

The thin film transistor array 160 includes a thin film transistor 170 formed on a lower substrate 161 , a pixel electrode 156 , and a common electrode 186 . The thin film transistor 170 supplies a data signal from a data line to the pixel electrode 156 in response to a gate signal from the gate line. To this end, the thin film transistor 170 is formed on the gate electrode 172, the semiconductor layer 174 overlapping with the gate electrode 172 and the gate insulating layer 162 interposed therebetween, and the first protective layer 164 to form the semiconductor layer. and source and drain electrodes 176 and 178 in contact with (174). The common electrode 186 is connected to a common line supplying a common voltage. When the common electrode 186 is a fringe field type liquid crystal display panel, the common electrode 186 is formed on the organic passivation layer 158 to have a plurality of slits. Unlike this, in the case of a horizontal field type liquid crystal panel, the common electrode 186 is formed parallel to the pixel electrode 156 and alternately formed with the pixel electrode 156 . In the case of a vertical field type liquid crystal display panel, the common electrode 186 is disposed on the upper substrate 151 . The pixel electrode 156 is formed on the second passivation layer 166 and is connected to the source electrode or drain electrode of the thin film transistor 170 . When a video signal is supplied through the thin film transistor 170, the pixel electrode 156 forms an electric field with the common electrode 186 supplied with a common voltage. Accordingly, liquid crystal molecules of the liquid crystal layer 188 arranged between the color filter array 150 and the thin film transistor array 160 rotate due to dielectric anisotropy. In addition, light transmittance passing through the transmission regions ER is changed according to the degree of rotation of the liquid crystal molecules, thereby implementing a gray scale. The transmission regions ER may be referred to as emission regions.

The color filter array 150 includes a black matrix 154 and color filters 152 stacked on an upper substrate 151 . The color filter 152 includes a red color filter, a green color filter, and a blue color filter, and is formed on the upper substrate 151 of the transmission regions ER prepared by the black matrix 154 to implement a corresponding color. do. The black matrix 154 is formed in the light-blocking region BR between sub-pixels, and serves to prevent light interference and light leakage between transmission regions ER of adjacent sub-pixels. The light blocking area BR may be referred to as a non-emission area.

Meanwhile, although the color filter 152 is described as being disposed between the upper substrate 151 and the black matrix 154 in FIG. 3 as an example, the black matrix 154 is disposed between the upper substrate 151 and the color filter 152. may be placed.

The light diffusion film 200 includes the light diffusion layer 210 in which the light emitting materials 214 are dispersed, so that the color filter 152 disposed in the transmission area ER of each sub-pixel of the liquid crystal display panel 130 is formed. The passing light is diffused to the light blocking area BR overlapping the black matrix 154, so that the screen door effect in which the user recognizes the light blocking area BR can be reduced.

FIG. 4 is a cross-sectional view illustrating a display device using an organic light emitting display panel having a white light emitting layer as the display panel shown in FIG. 1 .

The display device shown in FIG. 4 includes a light diffusion film 200 disposed on an organic light emitting display panel 130'.

The organic light emitting display panel 130' includes a color filter array 150 and a thin film transistor array 160' bonded together by an adhesive layer 148.

Since the color filter array 150 has the same structure as the color filter array 150 shown in FIG. 3, a detailed description thereof will be omitted.

The thin film transistor array 160' includes a thin film transistor 170 formed on a lower substrate 161, a light emitting element 180, and an encapsulation layer 138. The encapsulation layer 138 serves to improve the reliability of the organic light emitting display panel 130' by blocking penetration of moisture or oxygen from the outside.

The thin film transistor 170 is formed on the gate electrode 172, the semiconductor layer 174 overlapping with the gate electrode 172 and the gate insulating film 162 interposed therebetween, and the first protective film 164 to form the semiconductor layer 174. and source and drain electrodes 176 and 178 in contact with.

The light emitting element 180 includes an anode electrode 182 , an organic light emitting layer 184 formed on the anode electrode 182 , and a cathode electrode 186 formed on the organic light emitting layer 184 . The anode electrode 182 is formed on the second passivation layer 166 and electrically connected to the source electrode or drain electrode of the thin film transistor 170 . The organic light emitting layer 184 is formed on the anode electrode 182 of the light emitting region provided by the bank 168 to emit white light. The organic emission layer 184 may also be formed on the bank 168 . The organic light-emitting layer 184 is formed by stacking a hole-related layer, a light-emitting layer, and an electron-related layer in the order or reverse order on the anode electrode 182 . A cathode electrode 186 is formed on the organic light emitting layer 184 and the bank 168 .

The light diffusion film 200 includes the light diffusion layer 210 in which the light emitting materials 214 are dispersed, so that the light diffusion film 200 passes the color filter 152 disposed in the light emitting area of each sub-pixel of the organic light emitting display panel 130'. A screen door effect in which the light blocking area is recognized by the user may be reduced by diffusing the light to a light-blocking area (or a non-light-emitting area) overlapping the black matrix 154 .

FIG. 5 is a cross-sectional view illustrating a display device using an organic light emitting display panel having red, green, and blue light emitting layers as the display panel shown in FIG. 1 .

The display device shown in FIG. 5 includes a light diffusion film 200 disposed on an organic light emitting display panel 160".

The organic light emitting display panel 160" includes a thin film transistor 170, a light emitting element 180, and an encapsulation layer 138. A light diffusion film is formed on the encapsulation layer 138 formed to cover the light emitting element 180. 200 is placed.

The light emitting element 180 is formed in the light emitting region provided by the black bank 168″, and includes a red light emitting element R, a green light emitting element G, and a blue light emitting element B. Organic light emitting layer 184 includes a red light emitting layer, a green light emitting layer, and a blue light emitting layer respectively disposed on the red light emitting element R, the green light emitting element G, and the blue light emitting element B. The black bank 168" blocks light so that adjacent sub It serves to prevent light interference and light leakage between pixels.

The light diffusion film 200 includes the light diffusion layer 210 in which the light emitting materials 214 are dispersed, so that the light diffusion film 200 passes the color filter 152 disposed in the light emitting area of each sub-pixel of the organic light emitting display panel 160". A screen door effect in which a user recognizes a light-shielding area (or non-light-emitting area) may be reduced by diffusing light to a light-blocking area (or non-light-emitting area) overlapping the black bank 168″.

6a and 6b show images of a conventional display device to which no haze film is applied. 6A is an image displayed by emitting red, green, and blue subpixels in a conventional display device, and FIG. 6B is an image displayed by emitting only red subpixels in a conventional display device.

As shown in FIGS. 6A and 6B , in the case of a conventional display device, a screen door effect is generated in an image.

7A and 7B show images of a display device to which a haze film is applied as a comparative example. 7A is an image displayed by emitting red, green, and blue sub-pixels in the display device according to the comparative example, and FIG. 7B is an image displayed by emitting only red sub-pixels in the display device according to the comparative example.

Referring to FIGS. 7A and 7B , in the case of the display device according to the comparative example to which the haze film is applied, a screen door effect is improved in the implemented image, but a blurring phenomenon occurs.

8A and 8B show images of a display device according to an embodiment of the present invention. 8A is an image displayed by emitting red, green, and blue sub-pixels in a display device according to an exemplary embodiment of the present invention, and FIG. 8B is an image displayed by emitting only red sub-pixels in a conventional display device.

Referring to FIGS. 8A and 8B , in the case of a display device according to an embodiment of the present invention having a light diffusion film including a light diffusion layer in which light emitting materials are dispersed, a screen door effect in an implemented image is improved, but there is no image blurring at all.

9 is a perspective view schematically illustrating a head mounted display device according to an embodiment of the present invention.

Referring to FIG. 9, the head mounted display device 10 according to an embodiment of the present invention includes a front frame 1 and a front frame 1 accommodating the display device according to the embodiments of the present invention as described above. It is disposed on both sides of the may include a side frame (2) that can be mounted on the user's head. In addition, a lens unit disposed between the display device and the user's eyeball to magnify an image displayed by the display device may be accommodated in the front frame 1 .

According to an embodiment of the present invention, a display device in which a light diffusion film including a light diffusion layer in which light emitting materials are dispersed is attached to the surface of a display panel is employed, thereby preventing image blurring and sparkling effects, and a screen door effect. A head mounted display device capable of improving can be implemented.

A display device and a head mounted display device according to embodiments of the present specification may be described as follows.

A display device according to an embodiment of the present specification includes a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions, and light emitted from the plurality of light emitting regions disposed on the display panel. and a light diffusion film that diffuses light to the non-emission area by partially absorbing and emitting light. Here, the light diffusion film may include a base film and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed.

According to one embodiment of the present specification, the light emitting materials may include a fluorescent material, a quantum dot, or a quantum rod.

According to one embodiment of the present specification, the content of the light emitting materials in the light diffusion layer may be in the range of 1 wt% to 8 wt%.

According to one embodiment of the present specification, the light emitting materials may include at least one of a red light emitting material, a green light emitting material, and a blue light emitting material.

According to one embodiment of the present specification, the light diffusion layer may further include an ultraviolet absorber absorbing a wavelength of 400 nm or less.

According to one embodiment of the present specification, the light diffusion layer is an adhesive layer and may be directly attached to one surface of the display panel.

According to one embodiment of the present specification, the light diffusion layer may be attached to one surface of the display panel by an adhesive layer.

According to one embodiment of the present specification, the light diffusion film may further include a surface treatment layer on the other surface of the base film. Here, the surface treatment layer may include at least one of a hard coating layer, an anti-glare layer, an anti-reflection layer, or an anti-bacteria layer.

A head mounted display device according to an embodiment of the present specification includes a display device, a lens unit disposed between the display device and the user's eyeball, and a frame that accommodates the display device and the lens unit and can be worn on the user's head. include Here, the display device includes a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions, and disposed on the display panel to absorb some of the light emitted from the plurality of light emitting regions. A light diffusion film may include a base film and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed.

According to one embodiment of the present specification, the light emitting materials may include a fluorescent material, a quantum dot, or a quantum rod.

According to one embodiment of the present specification, the content of the light emitting materials in the light diffusion layer may be in the range of 1 wt% to 8 wt%.

According to one embodiment of the present specification, the light emitting materials may include at least one of a red light emitting material, a green light emitting material, and a blue light emitting material.

According to one embodiment of the present specification, the light diffusion layer may further include an ultraviolet absorber absorbing a wavelength of 400 nm or less.

According to one embodiment of the present specification, the light diffusion layer is an adhesive layer and may be directly attached to one surface of the display panel.

According to one embodiment of the present specification, the light diffusion layer may be attached to one surface of the display panel by an adhesive layer.

According to one embodiment of the present specification, the light diffusion film may further include a surface treatment layer on the other surface of the base film. Here, the surface treatment layer may include at least one of a hard coating layer, an anti-glare layer, an anti-reflection layer, or an anti-bacteria layer.

Meanwhile, in this specification, a liquid crystal display panel and an organic light emitting display panel have been described as examples of display panels, but all other display panels having a light blocking area may be applied.

In addition, in the present specification, only a top emission type organic light emitting display panel is described as an example when an organic light emitting display panel is applied as a display panel, but a bottom emission type organic light emitting display panel may also be applied.

Also, in this specification, a display panel having 4 sub-pixels has been described as an example, but a display panel having 3 sub-pixels or 5 sub-pixels is also applicable.

Although the embodiments of the present specification have been described in detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit. Therefore, the embodiments disclosed herein are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: display panel
200: light diffusion film
210: light diffusion layer
212: matrix resin
214: luminescent material
220: base film
230: surface treatment layer
250: adhesive layer

Claims (16)

a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions; and
a light diffusion film disposed on the display panel to absorb some of the light emitted from the plurality of light-emitting areas and diffuse the light to the non-light-emitting areas by emitting light;
The light diffusion film may include a base film; and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed. According to claim 1,
The light-emitting materials include a fluorescent material, a quantum dot, or a quantum rod, the display device. According to claim 1,
The content of the light emitting materials in the light diffusion layer is in the range of 1 wt% to 8 wt%, the display device. According to claim 1,
The light emitting materials include at least one of a red light emitting material, a green light emitting material, or a blue light emitting material. According to claim 1,
The light diffusion layer further comprises an ultraviolet absorber absorbing a wavelength of 400 nm or less, the display device. According to claim 1,
The light diffusion layer is an adhesive layer and is directly attached to one surface of the display panel. According to claim 1,
The light diffusion layer is attached to one surface of the display panel by an adhesive layer, the display device. According to claim 1,
The light diffusion film further includes a surface treatment layer on the other surface of the base film,
The surface treatment layer includes at least one of a hard coating layer, an anti-glare layer, an anti-reflection layer, or an anti-bacterial layer, the display device. display device;
a lens unit disposed between the display device and the user's eye; and
A frame that accommodates the display device and the lens unit and can be worn on the user's head; includes,
The display device
a display panel including a plurality of light emitting regions and a non-light emitting region between the plurality of light emitting regions; and
a light diffusion film disposed on the display panel to absorb some of the light emitted from the plurality of light-emitting areas and diffuse the light to the non-light-emitting areas by emitting light;
The light diffusion film may include a base film; and a light diffusion layer provided on one surface of the base film and in which light emitting materials are dispersed. According to claim 9,
The light-emitting materials include a fluorescent material, a quantum dot, or a quantum rod, head mounted display device. According to claim 9,
The content of the light emitting materials in the light diffusion layer is in the range of 1 wt% to 8 wt%, head mounted display device. According to claim 9,
The light emitting materials include at least one of a red light emitting material, a green light emitting material, and a blue light emitting material. According to claim 9,
The light diffusion layer further comprises an ultraviolet absorber absorbing a wavelength of 400 nm or less, the head mounted display device. According to claim 9,
The light diffusion layer is an adhesive layer and is directly attached to one surface of the display panel. According to claim 9,
The light diffusion layer is attached to one surface of the display panel by an adhesive layer, the head mounted display device. According to claim 9,
The light diffusion film further includes a surface treatment layer on the other surface of the base film,
The surface treatment layer includes at least one of a hard coating layer, an anti-glare layer, an anti-reflection layer, or an anti-bacterial layer, the head mounted display device.

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