CN111338120A

CN111338120A - Display device

Info

Publication number: CN111338120A
Application number: CN201911142061.0A
Authority: CN
Inventors: 吳智淳; 鄭現太; 朴宰明; 金美羅
Original assignee: LG Display Co Ltd
Current assignee: LG Display Co Ltd
Priority date: 2018-12-18
Filing date: 2019-11-20
Publication date: 2020-06-26
Anticipated expiration: 2039-11-20
Also published as: CN111338120B; KR20200075730A

Abstract

The present disclosure relates to a display device having a camera hole 5 in a backlight unit 10 constituting a display unit 3. The display device has a dark area improving device which provides light to a dark area generating area at the back side of the camera hole 5 corresponding to the opposite side where the light source 16 is located, thereby improving the dark area generating area. The dark space improving means may comprise an optical fiber 30. The present disclosure can improve a dark region in an in-screen opening type display device in which a camera hole is located within a display unit, thereby enhancing visibility.

Description

Display device

Cross Reference to Related Applications

The present application claims priority from korean patent application No.10-2018-0164343, filed on 18.12.2018, and korean patent application No.10-2019-0108292, filed on 2.9.2019, the entire disclosures of which are incorporated herein by reference.

Technical Field

The present disclosure relates to a Display device, and more particularly, to an In-screen opening (Hole In Display) type Display device having a camera Hole In a Display screen.

Background

With the development of mobile devices such as smart phones, tablet computers, and notebook computers, the demand for display screens is gradually increasing. In recent years, there is a growing trend toward full-screen displays that cover the front surface and enhance the sense of immersion, in order to benefit from the size and design of mobile devices.

For example, if only the camera hole is left on the front display screen and all the rest is hidden, it may be a simple shape. When the current display screen becomes simple, the non-screen area is reduced, so that the sense of immersion is enhanced when viewing images and the like.

Disclosure of Invention

An object of the present disclosure is to provide a display device which improves a dark area so as to visually look bright and uniform and have excellent display quality in an in-screen opening type display device having a camera hole in a display screen.

According to features of the present disclosure for achieving the above object, the present disclosure includes a backlight unit having a camera hole, and a dark space improving device provided in a display apparatus, the dark space improving device providing light to a dark space generating region at a backside of the camera hole corresponding to an opposite side where a light source is located, thereby improving the dark space generating region.

The dark area improving device may include an optical fiber disposed in the light guide plate disposed on an edge of the backlight unit and receiving light from the light source to emit the light to the dark area generating region at a backside of the camera hole corresponding to an opposite side where the light source is located.

Alternatively, the dark area improving device may include a side reflection part which is disposed at a rear side of the camera hole corresponding to an opposite side of the backlight unit where the light source is located, and reflects a portion of the light passing through both sides of the camera hole to concentrate the light to the dark area generating region at the rear side of the camera hole.

Alternatively, the dark area improving device may be provided in the liquid crystal panel. That is, by controlling the driving of at least one of the plurality of sub-pixels in the liquid crystal panel positioned on the backlight unit, the dark area improving device can be realized, thereby improving the dark area generating region of the backside of the camera hole corresponding to the opposite side where the light source is positioned.

Drawings

The above and other objects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a front view illustrating a display device according to one embodiment of the present disclosure;

fig. 2 is a perspective view illustrating a backlight unit of a display device according to one embodiment of the present disclosure;

FIG. 3A is a plan view illustrating a structure of applying an optical fiber to one embodiment of the backlight unit of FIG. 2;

FIG. 3B is a cross-sectional view showing portion A-A of FIG. 3A;

FIG. 3C is a cross-sectional view showing portion B of FIG. 3A;

fig. 4 is a diagram showing a light profile in the light guide plate in the case where a dark region occurs at the back side of the camera hole;

fig. 5A is a diagram for explaining the structure and principle of an optical fiber, and fig. 5B is a diagram for explaining the principle of light emission in the structure of fig. 3B;

FIG. 6A is a plan view illustrating a structure in which an optical fiber is applied to another embodiment of the backlight unit of FIG. 2;

fig. 6B is an enlarged configuration diagram showing a portion a of fig. 6A;

FIG. 7 is a diagram showing a photograph of a dark contrast before and after applying an optical fiber to a backlight unit;

fig. 8 is a plan view illustrating a backlight unit of a display device according to still another embodiment of the present disclosure;

fig. 9 is a plan view illustrating the light guide plate and the reflective sheet of fig. 8;

fig. 10 is a plan view illustrating a display device according to still another embodiment of the present disclosure;

fig. 11 is a sectional view showing portions a-a and b-b of fig. 10.

Detailed Description

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

As shown in fig. 1, a display device 1 of the present disclosure is an in-screen aperture type display device having a camera hole 5 in a display unit 3. When the camera hole 5 is provided in the display unit 3, the bezel 7 corresponding to the edge around the display unit 3 can be narrowed, thereby achieving a simple design and enhancing the sense of immersion in viewing images and the like.

The camera hole 5 may be provided at the center of the upper portion of the display unit 3 or at one side of the upper portion.

The display device 1 includes a liquid crystal panel and a backlight unit. The liquid crystal panel operates by using light received from the outside, and the backlight unit supplies the liquid crystal panel with light. That is, the backlight unit 10 uniformly supplies light to the liquid crystal panel so that an image can be seen on the display unit 3.

As shown in fig. 2, a camera hole 5 is formed in the backlight unit 10. The camera hole 5 is formed in the backlight unit 10 to realize an in-screen aperture type display device.

The backlight unit 10 includes a light guide plate 11 and a light source 16. The light guide plate 11 uniformly disperses light received from a light source 16 disposed on a side or lower end thereof to a desired area. The light guide plate 11 may be made of polymethyl methacrylate resin (PMMA). The light guide plate 11 may be formed with an uneven pattern on a bottom surface thereof to reflect light in a specific direction, or may be formed with V-grooves to improve linearity of light.

The light source 16 may employ an LED. In one embodiment, the light sources 16 are positioned at the lower end of the light guide plate 11 in the form of an LED array.

The reflective sheet 12 is positioned on the bottom surface of the light guide plate 11 so that light is irregularly reflected and emitted toward the front surface of the light guide plate 11. The reflective sheet 12 enables more light to be transmitted to the liquid crystal panel.

A diffusion sheet 13, a prism sheet 14, and a protective sheet 15 for adjusting a light path are positioned on the upper surface of the light guide plate 11 such that light passing through the light guide plate 11 is received by the liquid crystal panel without loss. The diffusion sheet 13, the prism sheet 14, and the protective sheet 15 perform functions of diffusing, condensing, and protecting light passing through the light guide plate 11 to adjust it to uniform light of a specific direction required for the liquid crystal panel.

The backlight unit 10 further includes a light guide plate 17 between the light guide plate 11 and the reflective sheet 12. The light guide plate 17 is attached to the reflective sheet 12, serves as an edge supporting the light guide plate 11, and may be stacked when the liquid crystal panel is fixed in the backlight unit 10.

A camera hole 5 is formed through the reflection sheet 12, the light guide plate 11, the diffusion sheet 13, the prism sheet 14, and the protection sheet 15, and a camera lens 20 is installed in the camera hole 5.

As shown in fig. 3A, the backlight unit 10 includes an optical fiber 30. The optical fiber 30 serves as a dark field improving device to improve a dark field generating region at the back side of the camera hole 5. That is, the optical fiber 30 transmits light to the dark area generating region of the backside of the camera hole 5 corresponding to the opposite side where the light source 16 is located, thereby improving the dark area.

When the camera hole 5 is formed in the display unit 3, light cannot reach the back side (portion a in fig. 1) of the camera hole 5, thereby generating a dark area. This is caused by the linearity of the LED light source path, and because light advancing straight from the light source 16 is blocked by the camera hole 5 and cannot reach the back side of the camera hole 5.

A dark area is formed on the backside of the camera hole 5 corresponding to the portion a of fig. 1, and when measuring the light profile in the light guide plate, the dark area is formed on the backside of the camera hole, as shown in fig. 4. In the case of fig. 4, although improvement can be made by adjusting the pattern of the light guide plate 11, a dark area is generated. When the dark area is generated, visibility of the display unit is reduced and display quality is degraded. To solve this problem, the backlight unit 10 includes an optical fiber 30 for improving a dark area.

As shown in fig. 3A, the optical fiber 30 is located in the light guide plate 17 serving as an edge of the light guide plate 11. The optical fiber 30 is positioned within the light guide plate 17 along the longitudinal direction of the light guide plate 17, and both ends of the optical fiber 30 are in contact with the light source 16. The light guide plate 17 is formed with an opening portion 18 at a position corresponding to the back side of the camera hole 5 so that the optical fiber 30 is exposed toward the light guide plate 11.

The core of the optical fiber 30 is exposed to the light guide plate 11 in the opening 18. The core of the optical fiber 30 is exposed in the opening portion 18 so that light transmitted in the optical fiber 30 can be extracted from the exposed core. The core is exposed by cutting a portion of the outer circumference of the optical fiber 30 corresponding to the opening 18, but the method is not limited thereto. A concave-convex pattern may be formed on the surface of the core portion exposed through the opening portion 18. The concave-convex pattern gives irregular reflection and scattering effects to the core portion of the optical fiber, so that total internal reflection of light in the core portion corresponding to the opening portion 18 is broken, and light is extracted from the core portion. The concave-convex pattern may be a prism shape or a random concave-convex shape. The optical fiber 30 receives light from the light source 16 at both ends in contact with the light source 16 and transmits the light so that the portion exposed through the opening portion 18 emits the light to the dark space generation region at the back side of the camera hole 5. The light emitted to the dark area generating region improves the dark area on the backside of the camera hole 5.

The light totally reflected in the optical fiber 30 is emitted to the aperture 18.

As shown in fig. 5A, the optical fiber 30 transmits light from one side to the other side opposite to the one side by total internal reflection. Although the optical fiber is bent, the light travels along the inner wall surface by reflection by total internal reflection, so that the optical loss approaches zero.

The structure of the optical fiber includes a core, a cladding, and a buffer layer. The diameter of the core may be in the range of 5 μm to 15 μm, or in the range of 40 μm to 100 μm, the thickness of the cladding may be in the range of 125 μm to 140 μm, and the thickness of the buffer layer may be in the range of 250 μm to 900 μm. The material of the core of the optical fiber is different from that of the cladding, and thus, total reflection occurs between the core and the cladding of the optical fiber due to the difference in refractive index. For example, the material of the core and cladding of the optical fiber may comprise one or more components selected from the group consisting of silica glass, multi-component glass, acryl, and Polymethylmethacrylate (PMMA). The material of the buffer layer of the optical fiber may include one or more components selected from the group consisting of silicone, epoxy acrylate, urethane, and ethylene-vinyl acetate copolymer (EVA).

As shown in fig. 3B (fig. 3B is a cross section taken along line a-a of fig. 3A), the outer circumference of the optical fiber 30 is exposed toward the light guide plate 11 through the opening portion 18 of the light guide plate 17. The opening portion 18 has a slope 19 inclined outward toward the exit side thereof so as to emit light to a wider area. As shown in fig. 5A, in the optical fiber 30, the refractive index of the core is larger than that of the cladding. Therefore, when light is incident from the core to the cladding, the incident angle is larger than the critical angle, so that the light is not refracted but totally reflected. Therefore, even if the core is exposed to the opening, light is not extracted from the core because the refractive index of the core is still larger than that of air. Therefore, as shown in fig. 5B, a concave-convex pattern is formed on the core portion corresponding to the opening portion to give irregular reflection and scattering effects to the core portion of the optical fiber, thereby changing the reflection angle of light so that light can be emitted from the core portion having a high refractive index toward air having a low refractive index.

Meanwhile, as shown in fig. 3B, it is preferable that the length of the opening portion 18 corresponds to the diameter of the camera hole 5 or more in order to emit sufficient light to the dark area. Although it is described in one embodiment that one opening portion 18 is formed at a position corresponding to the back side of the camera hole 5, a plurality of opening portions 18 may be formed at certain intervals to improve a dark area.

As shown in fig. 3C, the optical fiber 30 may be inserted into the light guide plate 17 by injection when the light guide plate 17 is manufactured. When the optical fiber 30 is integrally manufactured with the light guide plate 17, alignment or the like is facilitated when the backlight unit 10 is manufactured.

In another example, the optical fiber may be inserted in the light guide plate 11 when the light guide plate 11 is injected, so that the optical fiber 30 is located inside the light guide plate 11, instead of being inserted in the light guide plate 17. Alternatively, the optical fiber 30 may be located in a space between the light guide plate 17 and the light guide plate 11.

In another embodiment, as shown in FIG. 6A, the optical fibers 30 may be split into two fiber optic light guides located within the light guide 17 that serves as the edge of the light guide 11. The optical fiber 30 may be positioned within the light guide plate 17 such that both ends thereof contact the light source 16, and the optical fiber 30 may be divided in the opening portion 18a with the

end portions

31a, 31b of the divided

optical fibers

30a, 30b facing the camera hole 5.

As shown in fig. 6B, the opening 18a may be formed to have a size corresponding to the end portions 31a, 31B of the optical fibers 30a, 30B. In one embodiment, two opening portions 18a are formed in the light guide plate 17, and light is emitted from the

end portions

31a, 31b of the

optical fibers

30a, 30b located in the two opening portions 18a to the dark area on the back side of the camera hole 5. The two opening portions 18a are adjacent to each other so that light is partially overlapped when emitted, thereby allowing the light to uniformly reach the entire dark area.

Specifically, light from the light source 16 may be received at both ends of the optical fiber 30 that are in contact with the light source 16, the light may move to

respective ends

31a, 31b of the

optical fibers

30a, 30b that are located in the opening 18a, and the light may be emitted in the opening 18 a. When light is emitted to the dark area through each

end

31a, 31b of the

optical fiber

30a, 30b, the light emission efficiency is better than that in the case of emitting light through the outer circumference of the optical fiber 30 in one embodiment, thereby improving the dark area improving effect.

The optical fiber 30 may be inserted in the light guide plate 17 by injection when the light guide plate 17 is manufactured. When the optical fiber 30 is integrally manufactured with the light guide plate 17, alignment or the like is facilitated when the backlight unit 10 is manufactured.

The light guide plate 17 may also be positioned at the edge of the light guide plate 11 by using one mold injection so that the optical fibers 30 are embedded in the light guide plate 17, and the light guide plate 17 may also be positioned at the edge of the light guide plate 11 by using two mold injections so that the

optical fibers

30a, 30b are respectively embedded in the light guide plate 17.

Fig. 7 shows a photograph of a dark contrast before and after applying the optical fiber to the backlight unit.

As shown in fig. 7, fig. 7(a) is a view before the application of the optical fiber, which confirms that, when a camera hole is formed in the display unit, light cannot reach the back side of the camera hole, thereby generating a dark area. Fig. 7(b) is a diagram showing application of an optical fiber to a backlight unit. Fig. 7(c) is a view showing after the optical fiber is applied as shown in fig. 7(b), which confirms that bright and uniform visibility can be ensured even when a camera hole is formed in the display unit. Thus, it was confirmed that the optical fiber transmits light to a dark region at the back side of the camera hole, thereby improving the dark region.

In still another embodiment, as shown in fig. 8, the backlight unit 10b may include a side reflection part 40, and the side reflection part 40 serves to reflect a portion of light passing through both sides of the camera hole 5 to concentrate the light to a dark area generating region at the rear side of the camera hole 5. The side reflection part 40 serves as a dark area improving means to improve a dark area generating area on the backside of the camera hole 5. That is, the side reflection part 40 reflects the light from the light source 16 to the back side of the camera hole 5, thereby improving the dark area.

The side reflection portion 40 may be formed to have an "Λ" shape so that light passing through both sides of the camera hole 5 may be reflected and concentrated to the back side of the camera hole 5. The "Λ" shape maximizes the light reflection efficiency by the concentrating function toward the backside of the camera hole 5. The "Λ" shape forms an angle by connecting the end of one inclined surface and the end of the other inclined surface.

Specifically, the backlight unit 10b includes a light guide plate 11 and a reflection sheet 12 on the rear surface of the light guide plate 11, and the side reflection part 40 may be formed such that a portion of the light guide plate 11 facing the backside of the camera hole 5 is formed to have an △ shape. △ shape includes two inclined surfaces directly connected to each other at one side thereof to form an angle and one horizontal surface through which the two inclined surfaces are connected to each other at the other side thereof.

The light source 16 is positioned at the lower end of the light guide plate 11 in the form of an LED array and irradiates light toward the upper portion of the light guide plate 11. light advancing straight due to the linearity of the light path of the LED light source is blocked by the camera hole 5 and does not reach the backside of the camera hole 5. however, the portion of the light guide plate 11 facing the backside of the camera hole 5 may be formed to have a "Λ" shape or "△" shape, and light passing through both sides of the camera hole 5 may be reflected by the "Λ" shape or "△" shape to be collected to the backside of the camera hole 5.

The shape of the side reflection portion 40 in the light guide plate 11 is formed in a shape of "Λ" or "△" having a width and an angle that enable light passing through both sides of the camera hole 5 to reach the side reflection portion 40, for example, it is preferable that the width of the shape of "Λ" or "△" in the light guide plate 11 is relatively longer than the diameter of the camera hole 5.

In one embodiment, the camera hole 5 is disposed at the upper portion of the display unit 3, and the side reflection part 40 is further formed in an △ shape at a position of the upper end of the light guide plate 11 corresponding to the backside of the camera hole 5, but when the camera hole 5 is disposed at the center of the upper portion of the display unit 3, a "△" shape may be further formed at the center of the upper end of the light guide plate 11 such that the position of the side reflection part 40 also corresponds thereto.

An auxiliary side reflection part 45 may be included therein, and the auxiliary side reflection part 45 is disposed at two waists of a triangular peak of the "△" shape of the side reflection part 40, and serves to improve the light reflection efficiency of the side reflection part 40.

The auxiliary side reflection part 45 may be formed by attaching a reflection plate to the two waists of the side reflection part 40 of the light guide plate 11, or by further adding a reflection plate corresponding to the two waists of the side reflection part 40 of the light guide plate 11 to the reflection sheet 12 placed on the rear surface of the light guide plate 11.

In one embodiment, as shown in fig. 9, the light guide plate 11 is formed with △ -shaped side reflection parts 40 at the upper end thereof at positions corresponding to the back side of the camera hole 5, and the reflection sheet 12 is formed with auxiliary side reflection parts 45 corresponding to two waists of the side reflection parts 40 of the light guide plate 11, and thus, when the reflection sheet 12 is positioned on the back side of the light guide plate 11, the auxiliary side reflection parts 45 are stacked on the side reflection parts 40, the side reflection parts 40 and the auxiliary side reflection parts 45 can increase the light reflection efficiency of the LED light sources, thereby improving the dark area of the back side of the camera hole 5.

In another embodiment, as shown in fig. 10 and 11, the display device 1 may control the driving of the white sub-pixel (W) of the color filter substrate 51 included in the liquid crystal panel 50, thereby improving a dark area disposed at the backside of the camera hole 5 in the display unit 3.

Specifically, the display device 1 may have a camera hole 5 formed in the backlight unit 10, and may control driving of a white subpixel of the liquid crystal panel 50 positioned at an upper portion of the backlight unit 10, thereby improving a dark area generation region at a backside of the camera hole 5.

The white sub-pixels of the dark area generating region at the back side of the camera hole 5 may be turned ON (ON) and the white sub-pixels of the remaining regions may be turned OFF (OFF), thereby minimizing the relative contrast and improving the dark area generating region at the back side of the camera hole 5.

The liquid crystal panel 50 includes transistors (TFTs), pixel electrodes, liquid crystals, a common electrode, a color filter substrate 51, and polarizers. The liquid crystal controls the transmission amount of light emitted from the backlight unit 10 by an electric field between the pixel electrode and the common electrode controlled by a Thin Film Transistor (TFT).

A common voltage common to the entire display unit 3 is applied to the common electrode, and a data voltage required for each pixel electrode is individually applied to the pixel electrode through the data line. Further, the display unit 3 includes a plurality of sub-pixels. The plurality of sub-pixels may include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. Further, each sub-pixel includes a color filter substrate 51 that performs color control on light transmitted through the corresponding sub-pixel region. The color filter substrate 51 may include a red (R) color filter, a green (G) color filter, a blue (B) color filter, and a white (W) color filter. At this time, the white subpixel may include a white (W) color filter, or may be implemented by a method not including a separate color filter.

The white sub-pixel may be driven by applying a voltage corresponding to a pixel electrode of the white sub-pixel. Specifically, by controlling a Thin Film Transistor (TFT) corresponding to the white subpixel to apply a voltage corresponding to a pixel electrode of the white subpixel, an electric field is formed between the pixel electrode and the common electrode, thereby controlling the operation of the liquid crystal to control the amount of transmitted light corresponding to the white subpixel (W), thereby implementing the driving of the white subpixel.

As shown in fig. 11, light advancing straight from the light source 16 is blocked by the camera hole 5 and does not reach the back side of the camera hole 5, thereby generating a dark area.

Accordingly, the white sub-pixel may be turned ON (ON) in a dark area ON the back side of the camera hole 5 so as to be seen brightly, and the white sub-pixel may be turned OFF (OFF) in the remaining area, thereby reducing the contrast between the dark area and the remaining area and having uniform visibility.

That is, the driving of the white subpixel (W) in the liquid crystal panel 50 may be controlled to make the dark region brighter and clearer than the remaining regions, thereby improving the contrast between the dark region and the region without the dark region.

Then, the white sub-pixel is turned OFF (OFF) in a region where the light is linearly progressed, so that the entire visibility is uniform.

Alternatively, in still another embodiment of the present disclosure, driving of a red or green or blue or white sub-pixel, or any two or more of them, among a plurality of sub-pixels in a display unit may be controlled to increase the brightness of a dark area at the back side of the camera hole, thereby minimizing contrast with respect to the remaining area and improving the dark area. That is, this can be achieved by controlling the liquid crystals of the plurality of sub-pixels such that the amount of transmitted light of the plurality of sub-pixels located in the dark area is further increased. For example, the data voltage applied to the plurality of sub-pixels located in the dark area may be greatly increased to display a brighter image, unlike the remaining area, to increase the brightness of the dark area.

Hereinafter, the operation of the present disclosure will be described.

The display device of the present disclosure is configured to transmit light to a dark area generating region of a backside of a camera hole in which a camera is inserted, thereby improving the dark area.

That is, in one embodiment, as shown in fig. 3A and 3B, the present disclosure is configured such that the optical fiber 30 is located within the light guide plate 17, and the optical fiber 30 receives light from the light source 16 and emits the light to the dark space generation region on the back side of the camera hole 5 corresponding to the opposite side where the light source 16 is located.

The optical fiber 30 may transmit light from the light source 16 to a dark area using the principle of total reflection, thereby improving the dark area and providing uniform visibility over the entire surface of the display unit 3.

At this time, since the optical fibers 30 are integrally embedded in the light guide plate 17 by injection, alignment may be facilitated when the backlight unit 10 is manufactured.

Alternatively, in another embodiment, as shown in fig. 6A and 6B, the present disclosure may be configured such that the ends 31a, 31B of the optical fiber 30 emit light to the dark-area generating region at the back side of the camera hole 5, thereby maximizing the dark-area improving effect.

Alternatively, in yet another embodiment, as shown in fig. 8, the present disclosure may be configured such that a portion of the light passing through both sides of the camera hole 5 is reflected to concentrate the light to a dark-area generating region at the back side of the camera hole 5, thereby improving the dark area.

Alternatively, in still another embodiment, as shown in fig. 10, the present disclosure may control the driving of the white subpixel (W) in the liquid crystal panel 50 positioned at the upper portion of the backlight unit 10, thereby minimizing the relative contrast between the dark area at the backside of the camera hole 5 and the remaining area and improving the dark area.

Accordingly, the present disclosure can realize an in-screen aperture type display device in which the position of the camera is located within the display unit, while providing excellent display quality and providing high-quality images.

The present disclosure described above is applicable to a combination of part or all of one embodiment, another embodiment, and yet another embodiment.

In addition, the display device of the present disclosure is applicable not only to mobile displays but also to LCD TVs, navigation systems, DMB, monitors, and the like.

The present disclosure utilizes the total reflection principle of the optical fiber to transmit the light from the LED light source to the dark area at the back side of the camera hole, thereby improving the dark area; reflecting a portion of the light passing through both sides of the camera hole to concentrate the light to a dark area generating region at a back side of the camera hole, thereby improving the dark area; or controlling the driving of the white sub-pixel (W) in the liquid crystal panel so as to minimize a relative contrast between a dark area at a backside of the camera hole and the remaining area, thereby improving the dark area.

Accordingly, the present disclosure can provide uniform, bright visibility by improving a dark area, even while implementing an in-screen aperture type display device in which the position of a camera is located within a display unit, thereby providing a display device having excellent display quality.

The disclosure discloses in the drawings and specification the best mode. Although specific terms are employed herein, they are used only to describe the present disclosure, and are not used to limit the meaning or scope of the present disclosure described in the claims. Accordingly, it will be understood by those skilled in the art that various modifications and other equivalent embodiments can be made therein. Therefore, the true technical scope of the present disclosure should be determined by the technical spirit of the appended claims.

Claims

1. A display device includes a liquid crystal panel, a backlight unit and a camera hole,

wherein the backlight unit includes: a light guide plate disposed on a back surface of the liquid crystal panel; a light source disposed at a side surface of the light guide plate,

wherein the camera hole is disposed on the light guide plate,

wherein the display device further includes a dark area improving device which provides light to a dark area generating region adjacent to a backside of the camera hole.

2. The display device according to claim 1, further comprising a light guide plate in the backlight unit,

wherein the dark space improving device includes an optical fiber disposed in the light guide plate, the optical fiber being connected to a light source,

wherein an opening portion formed in the light guide plate and exposing a portion of the optical fiber toward the dark space generating region is located at a side of the light guide plate opposite to the position of the light source.

3. The display device of claim 2, wherein the opening portion has a slope inclined outward toward an outlet thereof.

4. The display device of claim 1, wherein the dark area improving device comprises one or more optical fibers, one end of the optical fibers being connected to a light source, the other end of the optical fibers being disposed adjacent to or in the dark area generating region.

5. The display device of claim 4, wherein the backlight unit further comprises a light guide plate disposed around a periphery of the light guide plate, and the optical fiber is disposed in the light guide plate.

6. The display device of claim 5, wherein one or more opening parts formed in the light guide plate and exposing the other end of the optical fiber toward the dark space generating region are disposed at positions adjacent to the dark space generating region.

7. The display apparatus of claim 1, wherein the dark area improving device comprises a side reflection part disposed at one side of the light guide plate, the side reflection part reflecting the light transmitted in the light guide plate toward the dark area generating region.

8. The display device of claim 7, wherein the side reflection part comprises two slopes, ends of the two slopes being connected to each other to form an angle.

9. The display device of claim 7 or 8, wherein the backlight unit further comprises a reflective sheet disposed on a bottom surface of the light guide plate, and the dark space improving device further comprises an auxiliary side reflective part disposed on the reflective sheet and on the side reflective part.

10. The display apparatus of claim 1, wherein the dark area improving means comprises a protrusion protruding from one side of the light guide plate, the protrusion reflecting the light transmitted in the light guide plate toward the dark area generating region.

11. The display device of claim 10, wherein the protrusion comprises two slopes, ends of the two slopes being connected to each other to form an angle.

12. The display device of claim 10 or 11, wherein the backlight unit further comprises a reflective sheet disposed on a bottom surface of the light guide plate, and the dark space improving device further comprises an auxiliary side reflective part disposed on the reflective sheet and on the protrusion part.

13. The display device according to claim 1, wherein the liquid crystal panel includes a plurality of sub-pixels,

wherein the dark area improving device includes a plurality of sub-pixels of the liquid crystal panel disposed in the dark area generating region, the plurality of sub-pixels emitting brighter light than the sub-pixels in a region other than the dark area generating region.

14. The display device of claim 13, wherein the sub-pixels of the liquid crystal panel comprise white sub-pixels, and the white sub-pixels in the dark area generating region are constantly turned on, and the white sub-pixels in regions other than the dark area generating region are constantly turned off.

15. The display device of claim 13, wherein a voltage applied to the plurality of subpixels in the dark area generating area is constantly higher than a voltage applied to the subpixels in an area other than the dark area generating area.