WO2019135455A1

WO2019135455A1 - Display device

Info

Publication number: WO2019135455A1
Application number: PCT/KR2018/007474
Authority: WO
Inventors: 김근환; 김민호; 정주영
Original assignee: 엘지전자(주)
Priority date: 2018-01-08
Filing date: 2018-07-02
Publication date: 2019-07-11
Also published as: KR20190084545A

Abstract

A display device is disclosed. The display device according to the present invention can comprise: a display panel; a light guide plate located at the rear of the display panel; a first optical assembly located at one side of the light guide plate; a second optical assembly located at the other side of the light guide plate; a first direction reflective protrusion located on the lower surface of the light guide plate and reflecting, toward the display panel, light provided from the first optical assembly; and a second direction reflective protrusion located on the lower surface of the light guide plate and reflecting, toward the display panel, light provided from the second optical assembly.

Description

Display device

The present invention relates to a display device.

(PDP), an electro luminescent display (ELD), a vacuum fluorescent display (VFD), a liquid crystal display (PDP), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used.

Among them, a liquid crystal panel of an LCD includes a TFT substrate and a color filter substrate facing each other with a liquid crystal layer and a liquid crystal layer interposed therebetween, and an image can be displayed using light provided from the backlight unit.

Recently, a lot of research is being done to improve the picture quality of the LCD. Improving the contrast ratio corresponds to this trend.

The present invention is directed to solving the above-mentioned problems and other problems. Another object may be to improve the contrast ratio of the display device.

Yet another object is to efficiently drive the local dimming of the display device.

According to an aspect of the present invention, there is provided a display panel comprising: a display panel; A light guide plate positioned behind the display panel; A first optical assembly positioned at one side of the light guide plate; A second optical assembly positioned on the other side of the light guide plate; A first direction reflection protrusion located on a lower surface of the light guide plate and reflecting the light provided by the first light assembly toward the display panel; And a second direction reflection protrusion which is disposed on a lower surface of the light guide plate and reflects light provided by the second light assembly toward the display panel.

According to another aspect of the present invention, the first direction reflection protrusion has a first inclined surface inclined from the lower surface of the light guide plate toward the first optical assembly, and the second direction reflection protrusion is formed on the lower surface of the light guide plate And a second inclined surface inclined from the first optical assembly toward the second optical assembly.

According to another aspect of the present invention, one side of the light guide plate and the other side of the light guide plate may face each other.

According to another aspect of the present invention, there are a plurality of the first direction reflection protrusions, and the density of the plurality of first direction reflection protrusions increases as the distance from the one side of the light guide plate increases.

Also, according to another aspect of the present invention, the density of the plurality of first direction reflection protrusions may be lowered toward the other side of the light guide plate.

According to another aspect of the present invention, there are a plurality of the second direction reflection protrusions, and the density of the plurality of second direction reflection protrusions increases as the distance from the other side of the light guide plate increases.

According to another aspect of the present invention, the density of the plurality of second direction reflection protrusions may be lowered toward the one side of the light guide plate.

According to another aspect of the present invention, the first direction reflection protrusion and the second direction reflection protrusion may be engraved on the lower surface of the light guide plate.

According to another aspect of the present invention, the first direction reflection projection includes a first rear surface that is connected to the first inclined surface and faces the second optical assembly, and the second direction reflection projection includes: And a second rear surface coupled to the sloped surface and facing the first optical assembly.

According to another aspect of the present invention, at least one of the first inclined surface and the second inclined surface may have an obtuse angle with respect to a lower surface of the light guide plate.

According to another aspect of the present invention, at least one of the first back surface and the second back surface may have a right angle or an acute angle with respect to a lower surface of the light guide plate.

According to another aspect of the present invention, the light guide plate includes: a first region adjacent to one side of the light guide plate; A second region adjacent to the other side of the light guide plate; And a third region positioned between the first region and the second region, wherein the first direction reflection projection is located in the first region and the third region, and the second direction reflection projection The second region, and the third region.

According to another aspect of the present invention, the sum of the first and second direction reflection protrusions may be higher than the first region or the second region.

According to another aspect of the present invention, the density of the sum of the first direction and the second direction reflection protrusions located in the third region is greater than the density of the sum of the first region and the second region, The area located between the adjacent areas may be lower.

Effects of the display device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, the contrast ratio of the display device can be improved.

According to at least one of the embodiments of the present invention, the local dimming of the display device can be efficiently driven.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 and 2 are views showing a display device related to the present invention.

3 to 9 are views showing the configuration of a display device related to the present invention.

10 to 14 are views showing examples of a light guide plate according to an embodiment of the present invention.

15 to 23 are views showing examples of a light guide plate pattern according to an embodiment of the present invention.

24 to 31 are diagrams showing examples of local dimming according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , &Lt; / RTI > equivalents, and alternatives.

Hereinafter, a liquid crystal display device (LCD) will be described as an example of the display panel. However, the display panel applicable to the present invention is not limited to the liquid crystal panel, but may be a plasma display panel, P), a field emission display (FED), and an organic light emitting diode (OLED).

In the following description, the display device includes a first long side (LS1), a second long side (LS2), a first long side (LS1) and a second long side (LS2) opposite to the first long side A first short side SS1 adjacent to the first short side SS1 and a second short side SS2 opposing the first short side SS1.

Here, the first short side SS1 is referred to as a first side area, the second short side SS2 is referred to as a second side area against the first side area, 1 long side area LS1 is referred to as a third side area adjacent to the first side area and the second side area and located between the first side area and the second side area, and the second long side area LS2 may be referred to as a fourth side area adjacent to the first side area and the second side area and located between the first side area and the second side area and against the third side area .

Although the lengths of the first and second long sides LS1 and LS2 are longer than the lengths of the first and second short sides SS1 and SS2 according to the convenience of the description, LS2 may be substantially equal to the lengths of the first and second short sides SS1 and SS2.

In the following description, a first direction (DR1) is a direction parallel to a long side (LS1, LS2) of the display panel 100 and a second direction (DR2) May be in a direction parallel to the short side (SS1, SS2).

The third direction DR3 may be a direction perpendicular to the first direction DR1 and / or the second direction DR2.

The first direction DR1 and the second direction DR2 may collectively be referred to as a horizontal direction.

In addition, the third direction DR3 may be referred to as a vertical direction.

In another viewpoint, the side on which the display device displays an image may be referred to as a front side or a front side. When a display device displays an image, a side on which an image can not be observed can be referred to as a rear side or a rear side. When looking at the display from the front side or the front side, the first long side LS1 side can be referred to as the upper side or the upper side. Likewise, the second long side LS2 can be referred to as the lower side or the lower side. Likewise, the first short side SS1 may be referred to as the left side or the seat side, and the second short side SS2 may be referred to as the right side or the right side.

In addition, the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 may be referred to as the edges of the display device. A corner where the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 meet with each other can be referred to as a corner. For example, a point where the first long side LS1 and the first short side SS1 meet is a first corner C1, a point where the first long side LS1 and the second short side SS2 meet is a second corner C2 A point where the second short side SS2 meets the second long side LS2 is a third corner C3 and a point where the second long side LS2 and the first short side SS1 meet is a fourth corner C4. .

Here, the direction from the first short side SS1 to the second short side SS1 or the direction from the second short side SS2 to the first short side SS1 can be referred to as the left and right direction LR. The direction from the first long side LS1 to the second long side LS2 or the direction from the second long side LS2 to the first long side LS1 may be called the up and down direction UD.

Referring to FIGS. 1 and 2, a display device 100 according to the present invention may include a display panel 110 and a back cover 150 behind the display panel 110.

The back cover 150 may be connected to the display panel 110 in a sliding manner in a direction from the first long side LS1 toward the second long side LS2, that is, in the second direction DR2. In other words, the back cover 150 is attached to the first short side SS1 of the display panel 110, the second short side SS2 against the first short side SS1 and the first short side SS1, And can be fitted in a sliding manner from the first long side LS1 located between the first short side SS1 and the second short side SS2.

In order to connect the back cover 150 to the display panel 110 in a sliding manner, the back cover 150 and / or other structures adjacent thereto may include projections, sliding portions, engaging portions, and the like.

3, the display device 100 according to the present invention may include a front cover 105, a display panel 110, a backlight unit 120, a frame 130, and a back cover 150.

The front cover 105 may cover at least a part of the front surface and the side surface of the display panel 110. The front cover 105 may be in the form of a rectangular frame having a hollow center. Since the center of the front cover 105 is empty, the image of the display panel 110 can be displayed externally.

The front cover 105 can be divided into a front cover and a side cover. That is, it can be divided into a front cover positioned on the front side of the display panel 110 and a side cover positioned on the side of the display panel 110. The front cover and the side cover may be separately configured. Either the front cover or the side cover may be omitted. For example, for the purpose of aesthetic design or the like, it means that there is no front cover, but only a side cover exists.

The display panel 110 is provided on the front surface of the display device 100 and images can be displayed. The display panel 110 divides the image into a plurality of pixels, and outputs the image by adjusting the color, brightness, and saturation of each pixel. The display panel 110 may be divided into an active area in which an image is displayed and a de-active area in which an image is not displayed. The display panel 110 may include a front substrate and a rear substrate facing each other with a liquid crystal layer interposed therebetween.

The front substrate may include a plurality of pixels consisting of red (R), green (G) and blue (B) sub-pixels. The front substrate can generate an image corresponding to the color of red, green, or blue according to a control signal.

The back substrate may include switching elements. The rear substrate can switch the pixel electrodes. For example, the pixel electrode can change the molecular arrangement of the liquid crystal layer according to a control signal applied from the outside. The liquid crystal layer may include a plurality of liquid crystal molecules. The liquid crystal molecules can change the arrangement in accordance with the voltage difference generated between the pixel electrode and the common electrode. The liquid crystal layer can transmit light provided from the backlight unit 120 to the front substrate.

The backlight unit 120 may be positioned behind the display panel 110. The backlight unit 120 may include a plurality of light sources. The light source of the backlight unit 120 may be arranged in a direct-type or an edge-type. In the case of the direct-type backlight unit 120, a diffusion plate may be further included.

The backlight unit 120 may be coupled to the front and side surfaces of the frame 130. For example, it is meant that a plurality of light sources may be disposed within one side of the frame 130, and in such a case may be referred to as an edge type backlight unit.

The backlight unit 120 may be driven by a whole driving method or a partial driving method such as local dimming, impulsive, or the like. The backlight unit 120 may include an optical sheet 125 and an optical layer 123.

The optical sheet 125 may allow light from the light source to be uniformly transmitted to the display panel 110. The optical sheet 125 may be composed of a plurality of layers. For example, at least one prism sheet and / or at least one diffusion sheet.

The optical sheet 125 may have at least one engagement portion 125d. The engaging portion 125d can be engaged with the front cover 105 and / or the back cover 150. [ That is, directly to the front cover 105 and / or the back cover 150. [ Alternatively, the engagement portion 125d may be coupled to the structure coupled to the front cover 105 and / or the back cover 150. [ That is, to the front cover 105 and / or the back cover 150.

The optical layer 123 may include a light source or the like. The specific structure of the optical layer 123 will be described in corresponding portions.

The frame 130 may serve to support the components of the display device 100. For example, a configuration such as the backlight unit 120 may be coupled to the frame 130. The frame 130 may be made of a metal such as an aluminum alloy.

The back cover 150 may be positioned on the rear surface of the display device 100. [ The back cover 150 can protect the internal structure from the outside. At least a portion of the back cover 150 may be coupled to the frame 130 and / or the front cover 105. The back cover 150 may be an injection-molded material of a resion.

Referring to FIG. 4A, the optical sheet 125 may be positioned in front of the frame 130. FIG. The optical sheet 125 can engage with the frame 130 at the edge of the frame 130. The optical sheet 125 can be directly seated on the edge of the frame 130. [ That is, the optical sheet 125 can be supported by the frame 130. The edge surface of the reflective sheet 125 can be wrapped by the first guide panel 117. For example, the optical sheet 125 may be positioned between the edge of the frame 130 and the flange 117a of the first guide panel 117.

The display panel 110 may be positioned on the front surface of the optical sheet 125. The edge of the display panel 110 may be coupled to the first guide panel 117. That is, the display panel 110 can be supported by the first guide panel 117.

An edge region of the front surface of the display panel 110 can be enclosed by the front cover 105. For example, it means that the display panel 110 can be positioned between the first guide panel 117 and the front cover 105.

Referring to FIG. 4B, the display device according to an embodiment of the present invention may further include a first guide panel 100 and a second guide panel 113. The optical sheet 125 can be coupled to the second guide panel 113. That is, it means that the second guide panel 113 is coupled to the frame 130 and the optical sheet 125 is coupled to the second guide panel 113. The second guide panel 113 may be made of a different material from the frame 130. The frame 130 may be configured to enclose the first and

second guide panels

117 and 113. The first or

second guide panel

117 or 113 may be referred to as a holder or a support member.

Referring to FIG. 4C, the front cover 105 may not cover the front surface of the display panel 110 in the display device 100 according to an embodiment of the present invention. That is, one end of the front cover 105 can be positioned on the side of the display panel 110.

5, the optical layer 123 may include a substrate 122, a reflective sheet 126, an optical assembly 124, and a light guide plate 128.

The optical layer 123 may be positioned in front of the frame 130. For example, the optical layer 123 may be positioned between the frame 130 and the optical sheet 125. The optical layer 123 may be supported by the frame 130.

The substrate 122 may be located inside the frame 130. The substrate 122 may be coupled to the first guide panel 117. The substrate 122 may be directly coupled to the first guide panel 117. For example, the substrate 122 may be configured to be coupled to at least one of the first guide panel 117, the frame 130, and the top case 105.

The substrate 124 may be positioned adjacent the side of the reflective sheet 126 and / or the light guide plate 128. That is, it means that the front surface of the substrate 124 can be directed to the optical layer 123. The substrate 124 and the reflective sheet 126 and / or the light guide plate 128 may be spaced apart from each other by a predetermined distance. The specific configuration of the substrate 122 and the optical layer 123 will be described in corresponding portions.

6 and 7, the backlight unit 120 includes an optical layer 123 including a substrate 122, at least one optical assembly 124, a reflective sheet 126, and a light guide plate 128, And an optical sheet 125 positioned on the front side of the layer 123. [

The substrate 122 may be located on at least one side of the other configuration of the optical layer 123. The substrate 122 may extend in the width direction of the other configuration of the optical layer 123.

At least one optical assembly 124 may be mounted on the substrate 122. An electrode pattern for connecting the adapter and the optical assembly 124 may be formed on the substrate 122. For example, a carbon nanotube electrode pattern may be formed on the substrate 122 to connect the optical assembly 124 and the adapter.

The substrate 122 may be composed of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate 122 may be a printed circuit board (PCB) on which at least one optical assembly 124 is mounted.

The optical assembly 124 may be disposed on the substrate 122 with a predetermined gap therebetween. The longitudinal width of the optical assembly 124 may be smaller than the thickness direction width of the light guide plate 128. Therefore, most of the light emitted from the optical assembly 124 can be transmitted to the inside of the light guide plate 128.

The optical assembly 124 may be a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip.

The optical assembly 124 may be comprised of a colored LED or white LED emitting at least one color from among colors such as red, blue, green, and the like. The colored LED may include at least one of a red LED, a blue LED, and a green LED.

The light source included in the optical assembly 124 may be a COB (Chip On Board) type. The COB type may be a form in which an LED chip, which is a light source, is directly coupled to the substrate 122. Thus, the process can be simplified. In addition, the resistance can be lowered, thereby reducing energy lost by heat. That is, it means that the power efficiency of the optical assembly 124 can be increased. The COB type can provide a brighter light. The COB type can be realized thinner and lighter than the conventional one.

The light guide plate 128 may be positioned in front of the optical assembly 124. The light guide plate 128 may serve to spread light incident from the optical assembly 124 widely. Although not shown, the light guide plate 128 may have a stepped shape adjacent to the optical assembly 124. The lower surface of the light guide plate 128 is inclined upward and can reflect light incident from the optical assembly 124 forward.

The reflective sheet 126 may be positioned behind the light guide plate 128. The reflective sheet 126 may reflect light emitted from the optical assembly 124 forward. The reflective sheet 126 can reflect the light reflected from the light guide plate 128 forward.

The reflective sheet 126 may comprise at least one of a metal and a metal oxide which are reflective materials. For example, the reflective sheet 126 may include a metal and / or a metal oxide having a high reflectance such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2) can do.

The reflective sheet 126 may be formed by depositing and / or coating a metal or metal oxide. The reflective sheet 126 may be printed with an ink containing a metal material. The reflection sheet 126 may have a vapor deposition layer formed by a vacuum vapor deposition method such as a thermal vapor deposition method, an evaporation method, or a sputtering method. The reflection sheet 126 may be formed with a coating layer and / or a printing layer using a printing method, a gravure coating method, or a silk screen method.

A diffusion plate (not shown) may be further provided on the entire surface of the light guide plate 128. The diffuser plate can diffuse the light emitted from the light guide plate 128 forward.

Between the light guide plate 128 and the optical sheet 125, an air gap may be located. The air gap can serve as a buffer through which light emitted from the optical assembly 124 can spread widely. On the other hand, the resin can be deposited on the optical assembly 124 and / or the reflective sheet 126. The resin may serve to diffuse the light emitted from the optical assembly 124.

The optical sheet 125 may be positioned in front of the light guide plate 128. [ The rear surface of the optical sheet 125 is in close contact with the light guide plate 128 and the front surface of the optical sheet 125 is in close contact with the rear surface of the display panel 110.

The optical sheet 125 may include at least one sheet. In detail, the optical sheet 125 may include one or more prism sheets and / or one or more diffusion sheets. The plurality of sheets included in the optical sheet 125 may be in an adhered and / or adhered state.

The optical sheet 125 may be composed of a plurality of sheets having different functions. For example, the optical sheet 125 may include first to third optical sheets 125a to 125c. The first optical sheet 125a has the function of a diffusing sheet and the second and third

optical sheets

125b and 125c can function as a prism sheet. The number and / or position of the diffusion sheet and prism sheet may be varied. For example, a first optical sheet 125a, which is a diffusion sheet, and a second optical sheet 125b, which is a prism sheet.

The diffusion sheet can prevent the light coming from the light guide plate 128 from being partially concentrated, thereby making the brightness of the light more uniform. The prism sheet can condense the light coming from the diffusion sheet and allow light to enter the display panel 110 vertically.

The engaging portion 125d may be formed on at least one of the corners of the optical sheet 125. [ The engaging portion 125d may be formed on at least one of the first to third optical sheets 125a to 125c.

The engaging portion 125d may be formed at a long side edge of the optical sheet 125. [ The engaging portion 125d formed on the side of the first long side and the engaging portion 125d formed on the side of the second long side may be asymmetric. For example, the position and / or number of the engaging portion 125d of the first long side and the engaging portion 125d of the second long side may be different from each other.

Referring to FIGS. 8 and 9, the substrate 122 and the optical assembly 124 may be positioned in the direction of the lower side 110c of the display panel 110. FIG. An edge type backlight unit in which the optical assembly 124 is disposed on the side of the display panel 110 can be referred to as an edge type backlight unit.

Referring to FIG. 8, the optical assembly 124 may emit light from the lower side 110c to the upper side 110d of the display panel 110. FIG. That is to say that the light emitted from the optical assembly 124 diffuses from the lower side 110c to the upper side 110d of the display panel 110 to emit the entire display panel 110. [ However, the present invention is not limited thereto, and the optical assembly 124 may be positioned on the upper side 110d of the display panel 110. [

Referring to FIG. 9A, the optical assembly 124 may be located on the right side 110a of the display panel 110. FIG. However, the present invention is not limited thereto, and the optical assembly 124 may be located on the left side 110b of the display panel 110. [

Referring to FIG. 9B, the optical assembly 124 may be positioned on the lower side 110c and the upper side 110d of the display panel 110. FIG. 9 (c), the optical assembly 124 may be positioned on the right side 110a and the left side 110b of the display panel 110. In addition, as shown in FIG.

Referring to FIGS. 9B and 9C, the optical assembly 124 is disposed on opposite sides of the display panel 110 as a dual type backlight unit. The dual type backlight unit can easily diffuse the light to the front surface of the display panel 110 even in the weaker light.

Referring to FIG. 9D, the optical assembly 124 may be located on a slope of the display panel 110. If the optical assembly 124 is located on a slope of the display panel 110, it is easier to diffuse the light than other backlight units.

10, the first optical assembly 224a may be positioned at one side 228S1 of the light guide plate 228 and the second optical assembly 224b may be positioned at the other side 228S2 of the light guide plate 228 have. The other side 228S2 of the light guide plate 228 may face or face one side 228S1 of the light guide plate 228. [ The light guide plate 228 may include

reflection protrusions

310 and 320. The

reflective protrusions

310 and 320 may be positioned adjacent to the lower surface 228R of the light guide plate 228 or may be formed on the lower surface 228R of the light guide plate 228. [ The lower surface 228R or the rear surface 228R of the light guide plate 228 may face or face the upper surface 228F or the front surface 228F of the light guide plate 228. [ The plurality of reflecting

protrusions

310 and 320 may be plural, and the plurality of reflecting

protrusions

310 and 320 may form a pattern. The cross-section of the reflecting

protrusions

310 and 320 may be rectangular, and may be circular or elliptical.

The plurality of

reflection protrusions

310 and 320 may include a first direction reflection protrusion 310 and a second direction reflection protrusion 320. The plurality of reflecting

protrusions

310 and 320 may be directional. For example, the first direction reflective protrusion 310 may reflect light provided by the first optical assembly 224a and the second direction reflective protrusion 320 may reflect light provided by the second optical assembly 224b Can be reflected.

The reflective sheet 226 may be positioned adjacent to the lower surface 228R of the light guide plate 228. [ The reflective sheet 226 may be configured to receive light incident on the light guide plate 228 from the first light assembly 224a and / or the second light assembly 224b toward the front of the light guide plate 228 or the display panel 110 .

The

reflective protrusions

310 and 320 may have

bottom surfaces

312 and 322,

rear surfaces

316 and 326, and inclined

surfaces

314 and 324. The sloped surfaces 314 and 324 can be referred to as effective reflecting

surfaces

314 and 324. The

rear surfaces

316 and 326 may be referred to as invalid

reflective surfaces

316 and 326. [ The first direction reflective protrusion 310 may have a first bottom surface 312, a first back surface 316 and a first inclined surface 314 and the second direction reflective protrusion 320 may have a second bottom surface 322 A second rear surface 326, and a second sloped surface 324. The second back surface 326,

Referring to FIG. 11, the first direction reflection protrusion 310 may be engraved on the lower surface 228R or the rear surface 228R of the light guide plate 228. FIG. If the first direction reflection protrusion 310 is engraved, the first bottom surface 312 may be an empty space. The first inclined surface 314 may be inclined at an angle ata1 with respect to the lower surface 228R or the rear surface 228R of the light guide plate 228 and the light provided from the first light assembly 224a may be inclined by the light guide plate 228, Toward the front surface 228F or the top surface 228F or the display panel 110 (see Fig. 5). For example, a certain angle (theta1) may be an obtuse angle.

The first rear surface 316 may be tilted by a predetermined angle ata2 with respect to the lower surface 228R or the rear surface 228R of the light guide plate 228 and the light provided by the second light assembly 224b may be inclined by the light guide plate 228, To the lower surface 228R or to the back surface 228R or to the second optical assembly 224b. For example, the angle ata2 may be a right angle or an acute angle.

In other words, the first direction reflection protrusion 310 can reflect the light provided from the first optical assembly 224a toward the front surface 228F or the top surface 228F of the light guide plate 228, but the second optical assembly 224b may not be reflected toward the front surface 228F or the top surface 228F of the light guide plate 228. [

Referring to FIG. 12, the second direction reflection protrusion 320 may be engraved on the lower surface 228R or the rear surface 228R of the light guide plate 228. FIG. If the second direction reflective protrusion 320 is engraved, the second bottom surface 322 may be an empty space. The second inclined surface 324 may be inclined at an angle ata1 with respect to the lower surface 228R or the rear surface 228R of the light guide plate 228 and the light provided from the second light assembly 224b may be inclined by the light guide plate 228, Toward the front surface 228F or the top surface 228F or the display panel 110 (see Fig. 5). For example, a certain angle (theta1) may be an obtuse angle.

The second rear surface 326 may be inclined at an angle ata2 with respect to the lower surface 228R or the rear surface 228R of the light guide plate 228 and the light provided from the first light assembly 224a may be tilted by the light guide plate 228, In the direction of the lower surface 228R or the back surface 228R or the first optical assembly 224a. For example, the angle ata2 may be a right angle or an acute angle.

In other words, the second direction reflection protrusion 320 can reflect the light provided by the second optical assembly 224b toward the upper surface 228F or the front surface 228F of the light guide plate 228, but the first optical assembly 224a may not be reflected toward the upper surface 228F or the front surface 228F of the light guide plate 228. [

13, the first direction reflection protrusion 310 may be imprinted on the lower surface 228R or the rear surface 228R of the light guide plate 228. [ If the first direction reflection protrusion 310 is engraved, the first bottom surface 312 may be an empty space. The first inclined surface 314 may be inclined at an angle ata1 with respect to the rear surface or the bottom surface of the imprinting layer IP and the light provided from the first light assembly 224a may be inclined to the front surface 228F Or the upper surface 228F or the display panel 110 (see Fig. 5). For example, a certain angle (theta1) may be an obtuse angle.

The first rear surface 316 may be tilted by a certain angle theta2 with respect to the imprinting layer IP and the light provided by the second optical assembly 224b may be tilted downward, 2 optical assembly 224b. For example, the angle ata2 may be a right angle or an acute angle.

Referring to FIG. 14, the second direction reflection protrusion 320 may be imprinted on the lower surface 228R or the rear surface 228R of the light guide plate 228. As shown in FIG. If the second direction reflective protrusion 320 is engraved, the second bottom surface 322 may be an empty space. The second inclined surface 324 may be inclined at an angle ata1 with respect to the rear surface or the bottom surface of the imprinting layer IP and the light provided from the second light assembly 224b may be inclined to the front surface 228F Or the upper surface 228F or the display panel 110 (see Fig. 5). For example, a certain angle (theta1) may be an obtuse angle.

The second rear surface 326 may be tilted by a predetermined angle theta2 with respect to the rear or bottom surface of the imprinting layer IP and the light provided by the first optical assembly 224a may be tilted Or back or toward the first optical assembly 224a. For example, the angle ata2 may be a right angle or an acute angle.

Referring to FIG. 15, the pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have a uniform distribution. In other words, the pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have a constant density. The pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have a constant distribution regardless of the change in the longitudinal direction L or the width direction W of the light guide plate 228 Density. Density may include density due to the number of protrusions and density due to size.

Referring to FIG. 16, the pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have a non-uniform distribution. In other words, the pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have varying densities. The pattern of the first direction reflection protrusions 310 and / or the pattern of the second direction reflection protrusions 320 may have a linearity according to the change of the longitudinal direction L or the width direction W of the light guide plate 228 And may have non-linearity. Density may include density due to the number of protrusions and density due to size.

Hereinafter, the first direction reflection protrusion 310 and / or the second direction reflection protrusion 320 may be referred to as a dot.

Referring to Fig. 17, the dot DT may be disposed in the dot region DA. The adjacent dots DT may be spaced apart from each other by the first interval O1. That is, the interval between the dots DT can be constant.

The interval between the dots DT may affect the reflectance or the like. For example, if the distance between the dots DT is dense, the reflectance can be increased.

Referring to FIG. 18, some of the adjacent dots DT may be spaced apart by a first interval O1, and in other cases may be spaced apart by a second interval O2. That is, the intervals between the dots DT may be different from each other.

Referring to FIG. 19, the dot area DA may be divided into a plurality of areas. For example, the dot area DA may be divided into a first area P1 and a second area P2. The dots DT included in the first area P1 and the second area P2 may have different attributes. For example, the number density or size of the first dot DT1 in the first area P1 may be different from the number density or size of the second dot DT2 in the second area P2.

Referring to FIG. 20, the dot area DA may be divided into a plurality of areas. For example, the dot area DA may be divided into the first to third areas P1 to P3. The first to third dots DT1 to DT3 included in the first to third regions P1 to P3 may have different attributes. For example, the second dot DT2 may be larger than the first dot DT1, and the third dot DT3 may be larger than the second dot DT2.

For example, the sizes of the first to third dots DT1 to DT3 are the same, but the number density in the second region P2 is different from the number density in the first region P1 and the number density in the second region P2, 3 region P3 may be different. Another example means that the number density in the second region P2 is larger than the number density in the first region P1 and the number density in the third region P3 may be larger than the number density in the second region P2.

Referring to FIG. 21, the dot area DA may not be clearly divided into a plurality of areas. However, at least one of the size, the number density, and the reflectance of the dot DT included in the dot area DA may be different. For example, as the direction of the X-axis increases, the size of the dots DT may gradually increase or the number of dots DT of the same size may increase.

22 and 23, the density of the dots DT, that is, the number of the dots DT or the size of the dots DT, may vary along the X direction. The light guide plate 228 includes a first area AR1, a second area AR2, a third area AR3, a fourth area AR4, a fifth area AR5, a sixth area AR6, and / And a seventh area AR7. The first to fourth regions AR1 to AR7 may be sequentially arranged from the first optical assembly 224a toward the second optical assembly 224b.

The density of the dots DT in the second area AR2 may be larger than the density of the dots DT in the first area AR1. The density of the dots DT in the third area AR3 may be larger than the density of the dots DT in the second area AR2. The density of the dots DT in the fourth area AR4 may be smaller than the density of the dots DT in the third area AR3. The fourth region AR4 may be a central region of the light guide plate 228. [ The density of the dots DT of the fifth region AR5 may be greater than the density of the dots DT of the fourth region AR4. The density of the dots DT of the sixth region AR6 may be smaller than the density of the dots DT of the fifth region AR5. The density of the dots DT in the seventh area AR7 may be smaller than the density of the dots DT in the sixth area AR6. The first area AR1 and / or the seventh area AR7 may be the outermost area of the light guide plate 228. [ The density of the dots DT of the light guide plate 228 may be symmetrical around the fourth area AR4.

10) and the second direction reflection protrusion 320 (see FIG. 10) in the second area AR2 to the sixth area AR6, for example, Can be mixed. For example, the first direction reflection protrusion 310 may include a first area AR1, a second area AR2, a third area AR3, a fourth area AR4, a fifth area AR5, and / Or the sixth region AR6. The second direction reflection protrusion 320 (see FIG. 10) includes a seventh area AR7, a sixth area AR6, a fifth area AR5, a fourth area AR4, a third area AR3, and / Or in the second region AR2.

10) and the second direction reflective protuberance 320 (see FIG. 10) in the third area AR3 to the fifth area AR5, for example, ) Can be mixed. For example, the first direction reflection protrusion 310 (see FIG. 10) may include a first area AR1, a second area AR2, a third area AR3, a fourth area AR4, and / May be formed in the region AR5. The second direction reflection protrusion 320 (see FIG. 10) includes a seventh area AR7, a sixth area AR6, a fifth area AR5, a fourth area AR4, and / or a third area AR3. As shown in FIG.

Referring to FIG. 24, the first optical assembly 224a may provide light to the light guide plate 228. FIG. The dot DT, that is, the first direction reflection protrusion 310 (see FIG. 10), may reflect light provided from the first optical assembly 224a to the light guide plate 228. [ The first area AR1, the second area AR2, the third area AR3, and / or the fourth area AR4 of the light guide plate 228 may be brightened.

Referring to FIG. 25, the second optical assembly 224b may provide light to the light guide plate 228. FIG. The dot DT, that is, the second direction reflection protrusion 320 (see FIG. 10), may reflect light provided from the second optical assembly 224b to the light guide plate 228. [ The fourth region AR4, the fifth region AR5, the sixth region AR6, and / or the seventh region AR7 of the light guide plate 228 may be brightened.

Referring to FIG. 26, the first optical assembly 224a and the second optical assembly 224b may provide light to the light guide plate 228. The dot (DT), that is, the first direction reflection protrusion 310 (see FIG. 10) reflects light provided from the first light assembly 224a to the light guide plate 228, and the second direction reflection protrusion 320 May reflect light provided to the light guide plate 228 from the second optical assembly 224b.

For example, the second to sixth areas AR2 to AR6 of the light guide plate 228 may be brighter, and the third area AR3 to the fifth area AR5 may be the second area AR2 and / Or the sixth region AR6.

Referring to FIGS. 27 to 31, the light guide plate 228 may include a first light guide plate 2281 and a second light guide plate 2282. The first light guide plate 2281 may be physically isolated or optically isolated from the second light guide plate 2282. The first light guide plate 2281 may be positioned between the first optical assembly 224a1 and the second optical assembly 224b1. The second light guide plate 2282 may be positioned between the third optical assembly 224a2 and the fourth optical assembly 224b2.

Referring to FIG. 27, the first optical assembly 224a1 and the fourth optical assembly 224b2 may provide light. The dot DT formed on the first light guide plate 2281, that is, the first direction reflection protrusion 310 (see FIG. 10) may reflect the light provided by the first light assembly 224a. The dot DT formed on the second light guide plate 2282, that is, the second direction reflection protrusion 320 (see FIG. 10) can reflect the light provided by the fourth light assembly 224b2.

For example, in the first light guide plate, the first area AR1, the second area AR2, the third area AR3, and / or the fourth area AR4 may be brighter. The second LGP may be illuminated in the fourth area AR4, the fifth area AR5, the sixth area AR6, and / or the seventh area AR7.

Referring to FIG. 28, the second optical assembly 224b and the third optical assembly 224a2 may provide light. The dot DT formed on the second light guide plate 2282, that is, the first direction reflection protrusion 310 (see FIG. 10) may reflect light provided by the third light assembly 224a2. The dot DT formed on the first light guide plate 2281, that is, the second direction reflection protrusion 320 (see FIG. 10) may reflect light provided by the second light assembly 224b.

For example, the second light guide plate 2282 can illuminate the first area AR1, the second area AR2, the third area AR3, and / or the fourth area AR4. The first light guide plate 2281 may illuminate the fourth region AR4, the fifth region AR5, the sixth region AR6, and / or the seventh region AR7.

Referring to FIG. 29, the first optical assembly 224a and the second optical assembly 224b may provide light. The dot DT formed on the first light guide plate 2281, that is, the first direction reflection protrusion 310 (see FIG. 10) may reflect the light provided by the first light assembly 224a. The dot DT formed on the first light guide plate 2281, that is, the second direction reflection protrusion 320, may reflect the light provided by the second light assembly 224b.

For example, in the first light guide plate 2281, the second area AR2, the third area AR3, the fourth area AR4, the fifth area AR5, and / or the sixth area AR6 are brighter Can be. The first area AR1 and / or the seventh area AR7 of the first light guide plate 2281 may be made brighter than the second area AR2 through the sixth area AR6 of the first light guide plate 2281. However, It can be relatively dark.

Referring to FIG. 30, the third optical assembly 224a2 and the fourth optical assembly 224b2 may provide light. The dot DT formed on the second light guide plate 2282, that is, the first direction reflection protrusion 310 (see FIG. 10) may reflect light provided by the third light assembly 224a2. The dot DT formed on the second light guide plate 2282, that is, the second direction reflection protrusion 320 (see FIG. 10) can reflect the light provided by the fourth light assembly 224b2.

For example, the second light guide plate 2282 may be configured such that the second area AR2, the third area AR3, the fourth area AR4, the fifth area AR5, and / or the sixth area AR6 are brighter Can be. The first area AR1 and / or the seventh area AR7 of the second light guide plate 2282 may be made brighter than the second area AR2 through the sixth area AR6 of the second light guide plate 2282. However, It can be relatively dark.

31, a first optical assembly 224a, a second optical assembly 224b, a third optical assembly 224a2, and a fourth optical assembly 224b2 may all provide light. The dot DT formed on the first light guide plate 2281, that is, the first direction reflection protrusion 310 (see FIG. 10) can reflect the light provided by the first light assembly 224a and the second direction reflection protrusion 320, see FIG. 10) may reflect light provided by the second optical assembly 224b. The dot DT formed on the second light guide plate 2282, that is, the first direction reflection protrusion 310 (see FIG. 10) can reflect light provided by the third light assembly 224a2 and the second direction reflection protrusion 320, see FIG. 10) may reflect light provided by the fourth optical assembly 224b2.

For example, the second area AR2, the third area AR3, the fourth area AR4, the fifth area AR5, and / or the second area AR2 of the first light guide plate 2281 and the second light guide plate 2282 6 region AR6 can be brightened. The third area AR3, the fourth area AR4, and / or the fifth area AR5 may be relatively brighter than the second area AR2 and / or the sixth area AR6.

Accordingly, detailed local dimming can be effectively performed for each section of the light guide plate 228.

Certain embodiments of the invention described above or other embodiments are not mutually exclusive or distinct from each other. Any or all of the embodiments of the invention described above may be combined or combined with each other in configuration or function.

Means that the A configuration described in the specific embodiment and / or the drawings may be combined with the B configuration described in other embodiments and / or drawings, for example. That is, even if the connection between the components is not described directly, it means that the connection is possible except when the connection is described as impossible. This is obvious when considering that the present invention is for a display device.

The foregoing detailed description should not be construed in all aspects as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims

A display panel;

A light guide plate positioned behind the display panel;

A first optical assembly positioned at one side of the light guide plate;

A second optical assembly positioned on the other side of the light guide plate;

A first direction reflection protrusion located on a lower surface of the light guide plate and reflecting the light provided by the first light assembly toward the display panel; And,

And a second direction reflection protrusion that is disposed on a lower surface of the light guide plate and reflects light provided by the second light assembly toward the display panel.
The method according to claim 1,

Wherein the first direction reflection protrusion has a first inclined surface inclined from the lower surface of the light guide plate toward the first optical assembly,

And the second direction reflection protrusion has a second inclined surface inclined from the lower surface of the light guide plate toward the second optical assembly.
3. The method of claim 2,

Wherein one side of the light guide plate and the other side of the light guide plate face each other.
The method of claim 3,

The first direction reflection protrusions are plural,

Wherein the plurality of first direction reflection protrusions have a higher density as the distance from the one side of the light guide plate increases.
5. The method of claim 4,

Wherein the plurality of first direction reflection protrusions have a lower density as they approach the other side of the light guide plate.
The method of claim 3,

The second direction reflection protrusions are plural,

Wherein the plurality of second direction reflection protrusions have a higher density as the distance from the other side of the light guide plate increases.
The method according to claim 6,

Wherein the plurality of second direction reflection protrusions have a lower density as they approach one side of the light guide plate.
The method according to claim 1,

Wherein the first direction reflection protrusion and the second direction reflection protrusion are engraved on a lower surface of the light guide plate.
3. The method of claim 2,

Wherein the first direction reflective projection has a first rear surface connected to the first inclined surface and facing the second optical assembly,

And the second direction reflective projection has a second rear surface that is connected to the second inclined surface and faces the first optical assembly.
10. The method of claim 9,

Wherein at least one of the first inclined surface and the second inclined surface has an obtuse angle with respect to a lower surface of the light guide plate.
10. The method of claim 9,

Wherein at least one of the first rear surface and the second rear surface has a right angle or an acute angle with respect to a lower surface of the light guide plate.
The method according to claim 1,

The light guide plate includes:

A first region adjacent to one side of the light guide plate;

A second region adjacent to the other side of the light guide plate; And,

And a third region positioned between the first region and the second region,

The first direction reflection protrusion may include:

The first region and the third region,

The second direction reflection projection

The second region, and the third region.
13. The method of claim 12,

And the sum of the first and second direction reflection protrusions has a density,

Wherein the third region is higher than the first region or the second region.
The method according to claim 1,

And the density of the sum of the first direction and the second direction reflection protrusions located in the third region,

And a region of the third region located between the adjacent regions is lower than regions adjacent to the first region and the second region.