KR20170088230A - Display device - Google Patents

Abstract

Disclosed is a display device which can improve an image quality. The display device of the present invention comprises: a display panel; a light guide plate positioned in the back of the display panel; a light assembly positioned on one side of the light guide plate, and providing light to the light guide plate; and a light absorption unit formed on the back surface of the light guide plate, and absorbing a part of a wavelength of the light provided by the light assembly.

Description

DISPLAY DEVICE {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.

The present invention is directed to solving the above-mentioned problems and other problems. Another object is to provide a display device capable of improving image quality.

Another object is to provide a display device capable of improving color reproduction rate.

Another object of the present invention is to provide a display device capable of effectively controlling the wavelength of light provided in the backlight unit.

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; An optical assembly positioned at one side of the light guide plate to provide light to the light guide plate; And a light absorber formed on a rear surface of the light guide plate and absorbing a part of light provided by the optical assembly.

According to another aspect of the present invention, there is provided a light emitting device, comprising: a light guide plate; and a reflective portion formed on a rear surface of the light guide plate and reflecting light provided from the light assembly toward the display panel.

According to another aspect of the present invention, the light absorbing portion or the reflecting portion forms a pattern, and the light absorbing pattern or the reflection pattern may have a uniform distribution.

According to another aspect of the present invention, the light absorber or the reflection part forms a pattern, and the light absorbing pattern or the reflection pattern may have a non-uniform distribution.

According to another aspect of the present invention, the light absorbing portion and the reflection portion may be integrally formed.

According to another aspect of the present invention, the light-absorbing portion may be formed around the reflective portion.

According to another aspect of the present invention, the reflective portion is a groove formed on a rear surface of the light guide plate, and the light absorbing portion may be located in the groove.

According to another aspect of the present invention, the reflective portion is a groove formed on a rear surface of the light guide plate, and the light absorbing portion is disposed on the rear surface of the light guide plate.

According to another aspect of the present invention, the light absorbing portion may include a tetraazapopyrine derivative.

According to another aspect of the present invention, the light absorber may include a sub-phthalocyanine dye.

According to another aspect of the present invention, a part of the light may have a wavelength of 530 nm to 630 nm.

According to another aspect of the present invention, a part of the light may have a wavelength of 580 nm to 630 nm.

According to another aspect of the present invention, a part of the light may be a light between a green series and a red series.

According to another aspect of the present invention, the light absorbing portion may be adhered to the back surface of the light guide plate.

According to another aspect of the present invention, the light absorber may further include a reflective material.

According to another aspect of the present invention, the light absorber may form a less dense pattern adjacent to the optical assembly and a more dense pattern away from the optical assembly .

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 image quality of the display device can be improved.

Further, according to at least one of the embodiments of the present invention, the color reproduction ratio can be improved.

Also, according to at least one embodiment of the present invention, the wavelength of light provided in the backlight unit can be effectively controlled.

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 and 11 are views showing examples of graphs relating to the wavelength of light.
12 to 16 are views showing examples of pattern formation according to an embodiment of the present invention.
17 is a view showing an example of a pattern according to an embodiment of the present invention.
18 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.
19 is a view showing an example of pattern formation according to an embodiment of the present invention.
20 is a diagram illustrating an example of a pattern according to an embodiment of the present invention.
21 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.
22 and 23 are diagrams showing examples of pattern formation according to an embodiment of the present invention.
24 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.
25 to 27 are views showing examples of pattern formation according to an embodiment of the present invention.
28 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.
29 and 30 are views showing examples of light guide plate patterns according to an embodiment of the present invention.
31 and 32 are diagrams showing examples of wavelengths of light according to an embodiment of the present invention.
33 to 35 illustrate examples of a display device 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. , ≪ / 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.

1 and 2 are views showing a display device according to an embodiment of the present invention.

As shown in these drawings, the 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 to 7 are views showing the configuration of a display device related to the present invention.

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 have.

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.

Figs. 4 and 5 are diagrams showing configurations of the optical sheet 125 and the like.

As shown in FIG. 4 (a), the optical sheet 125 can be positioned in front of the frame 130. 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.

As shown in FIG. 4 (b), 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.

4C, the front cover 105 may not cover the front surface of the display panel 110 in the display device 100 according to the 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.

As shown in FIG. 8, the optical assembly 124 may emit light in the direction 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. [

As shown in FIG. 9 (a), 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. [

The optical assembly 124 may be positioned on the lower side 110c and the upper side 110d of the display panel 110, as shown in FIG. 9 (b). 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.

As shown in FIGS. 9 (b) and 9 (c), 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.

As shown in FIG. 9D, the optical assembly 124 may be positioned on the oblique surface 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 is a diagram showing examples of graphs relating to the wavelength of light.

The x-axis represents the wavelength of light, and the y-axis represents the intensity of light. For example, O may be 380 nm, A may be 430 nm, B may be 480 nm, C may be 530 nm, D may be 580 nm, E may be 630 nm, F may be 680 nm, G may be 730 nm and H may be 780 nm. That is, B may be the intensity or distribution of the blue series, G may be the intensity or distribution of the green series, and R may be the intensity or distribution of the red series.

10 shows that the colors of blue (B), green (G) and red (R) are uniformly distributed, and blue (B), green (G) and red (R) Reproducibility is excellent. This is because the display device 100 displays various colors in combination of blue (B), green (G), and red (R).

FIG. 11 shows a distribution of light provided in the backlight unit. In particular, FIG. 11 may be representative of the distribution of the wavelength of light provided in the optical assembly 124. The optical assembly 124 may include an LED as a light source. The LED can emit white light. In this case, the LED emitting white light may be a blue LED packaged with a yellow phosphor. The light source having such a configuration can provide light of the wavelength and / or intensity shown in Fig.

Here, the distinction between the green (G) series and the red (R) series may not be clear. That is, in FIG. 11, it can be seen that the distinction or peak of the green (G) series and the red (R) series is not accurately distinguished. When such light is provided to the display panel 110, . This may cause degradation of the image quality of the display device 100. [

12 to 16 are views showing examples of pattern formation according to an embodiment of the present invention.

Referring to FIG. 12, a mask M may be disposed on one side of the light guide plate 128. The mask M may have a pattern. The pattern of the mask M may be formed through the mask M. [

Referring to FIG. 13, the ink 200 can be applied onto the mask M placed on the light guide plate 128. The ink 200 may include particles capable of scattering light. The ink 200 may include a light absorbing substance. The ink 200 may simultaneously contain particles capable of scattering light and a light absorbing substance.

The light absorbing substance may selectively absorb light. That is, the ink 200 can scatter light and selectively absorb light at the same time. Therefore, a light absorbing pattern, a light absorbing portion, an absorbing pad, an absorbent, etc. described below may include the following absorbing substance.

For example, the light absorbing material may comprise a sub-phthalocyanine compound of formula (1).

Wherein R1 to R4 are each independently selected from the group consisting of hydrogen; An alkyl group having from 1 to 6 carbon atoms, alkoxy or alkylamine; A phenyl group; An alkylphenyl group; A nitro group or a halogen-substituted phenoxy group; A nitro group; halogen; And is selected from the group consisting of cyano, and X is F, Cl or Br.

As another example, the light absorbing substance may further include the compound of the formulas (2) to (4).

Wherein R 'is an alkyl group having 1 to 6 carbon atoms and Y is ClO4-, Ab2F6-, BF3-, toluene sulfonate or benzenesulfonate anion.

Wherein M is Ni, Pb or Pt and R "dms is hydrogen or an alkyl or alkoxy group having 1 to 10 carbon atoms, phenyl substituted with halogen or alkylamine, or phenyl group.

Wherein M 'is Fe, Ni, Cu, Co or Pt, and R' "is hydrogen; An alkyl or alkoxy group having 1 to 10 carbon atoms; halogen; Or a nitro group, and A + is a tetraalkylammonium cation, wherein the alkyl group has 1 to 6 carbon atoms.

In another example, the light absorbing material may comprise a tetraazapopyrine derivative of formula (5).

Wherein R 1, R 2, R 3, R 4, R 5, R 6, R 7 and R 8 are independently selected from the group consisting of hydrogen; An unsubstituted phenyl group; An alkyl group having 1 to 8 carbon atoms; An alkoxy group having 1 to 8 carbon atoms; A nitro group; A halogen atom; Halide; Cyano; An alkylamino group having 1 to 8 carbon atoms; An aminoalkyl group having 1 to 8 carbon atoms; A phenyl group having a substituent selected from an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a nitro group, a halogen atom, a halide, an alkylamino group having 1 to 8 carbon atoms, an aminoalkyl group having 1 to 8 carbon atoms and a cyano group Or two adjacent substituents selected from substituents of R 1, R 2, R 3, R 4, R 5, R 6, R 7 and R 8 are fused to form a ring of 1 to 3 selected from the group of aromatic ring compounds of the formula Wherein the remaining substituents are independently selected from the group consisting of hydrogen; An alkyl group having 1 to 8 carbon atoms; An alkoxy group having 1 to 8 carbon atoms; An allyl group; A halogen atom; Halide; Cyano; A nitro group;

In another example, the light absorbing substance may comprise a tetraazapopyrine derivative of formula (6).

Wherein R 1, R 2, R 3, R 4, R 5, R 6, R 7 and R 8 are independently selected from the group consisting of hydrogen; An unsubstituted phenyl group; An alkyl group having 1 to 8 carbon atoms; An alkoxy group having 1 to 8 carbon atoms; A nitro group; A halogen atom; Halide; Cyano; An alkylamino group having 1 to 8 carbon atoms; An aminoalkyl group having 1 to 8 carbon atoms; A phenyl group having a substituent selected from an alkoxy group having 1 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms, a nitro group, a halogen atom, a halide, an alkoxy group having 1 to 8 carbon atoms, an aminoalkyl group having 1 to 8 carbon atoms and a cyano group Or two adjacent substituents selected from the substituents of R 1, R 2, R 3, R 4, R 5, R 6, R 7 and R 8 are fused to form 1 to 3 rings selected from the group of aromatic ring compounds of the formula Wherein the remaining substituents are independently selected from the group consisting of hydrogen; An alkyl group having 1 to 8 carbon atoms; An alkoxy group having 1 to 8 carbon atoms; Allyl group; A halogen atom; Halide; Cyano; A nitro group, M is a metal ion having a number 2 of oxidation and forms a complex with a tetraazaporphyrin ring or a complex oxide with a tetraazaporphyrin ring, Is a metal ion having a ligand capable of forming.

As another example, the light absorbing substance may further include the compounds of the formulas (7) to (9).

Wherein R9 is an alkyl group having 1 to 6 carbon atoms and Q is ClO4, Ab2F6, BF3, toluene sulfonate or benzenesulfonate.

Wherein M 'is Ni, Pd or Pt and R10 is hydrogen or an alkyl or alkoxy group of 1 to 10 carbon atoms; Halogen or alkylamine substituted phenyl; Or a phenyl group.

Wherein M "is Fe, Ni, Cu, Co or Pt, R11 is hydrogen, an alkyl or alkoxy group having 1 to 10 carbon atoms, a halogen or a nitro group, and A + is a tetraalkylammonium cation The number of carbon atoms is 1 to 6).

Referring to FIG. 13, the ink 200 applied on the pattern mask M can be removed by a squeeze (SQ). Referring to Fig. 14, the ink 200 remaining in the pattern mask M can be cured. The remaining ink 200 can be photo-cured by the light SL.

17 is a view showing an example of a pattern according to an embodiment of the present invention.

16 and 17 show the light guide plate 128 having the ink 200 forming the pattern on one side.

In Fig. 16, the cured ink 200 may be a reflection pattern and may be an absorbing pattern. For example, the ink 200 before curing may include a reflective material and / or a light absorbing material, so that the ink 200 after curing may be a reflective pattern and / or an absorbing pattern. The reflection pattern can be referred to as a reflection portion, and the light absorption pattern can be referred to as a light absorption portion. Depending on the scale of the cured ink 200, the reflective pattern or the reflective portion may be referred to as a reflective pad or reflective dot and the absorbing pattern or absorber may be referred to as an absorbent pad or absorbance dot. The reflective pad may be a first pad, and the light absorbing pad may be a second pad. The reflective dot may be a first dot and the absorbance dot may be a second dot. They may be used to refer primarily to the plural, but not to the singular. These can also be defined similarly in the following description.

Referring to FIG. 17, a reflection and absorption pattern 200 may be formed on one side of the light guide plate 128. One side of the light guide plate 128 may be a bottom surface. That is, one side of the light guide plate 128 may be the opposite side of the side facing the display panel 110.

18 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.

The light L1 emitted from the optical assembly 124 may be directed to the light guide plate 128. [ At this time, the light L1 provided by the optical assembly 124 may have the distribution of light described with reference to FIG. That is, when the light L1 provided by the optical assembly 124 is provided to the display panel 110 through the light guide plate 128, the color reproducibility of the image displayed through the display panel 110 may be insufficient have.

The light L1 provided in the optical assembly 124 may be totally reflected and / or reflected by the light guide plate 128. [ At this time, the reflection and absorption pattern 200 may reflect, refract, and / or scatter light that is totally reflected and / or reflected by the light guide plate 128. At the same time, the reflection and absorption pattern 200 can absorb some wavelengths of light totally reflected and / or reflected by the light guide plate 128. That is, the light L2 provided by the light guide plate 128 to the display panel 110 not only improves the color reproducibility of the image displayed through the display panel 110 but also improves the uniform distribution degree do.

19 is a diagram showing another example of pattern formation according to an embodiment of the present invention. 20 is a diagram showing another example of a pattern according to an embodiment of the present invention.

19 and 20, the reflection pattern 210 may be formed on one side of the light guide plate 128. [ The light absorbing pattern 220 may be formed on one side of the light guide plate 128. One surface of the light guide plate 128 may be the rear surface of the light guide plate 128. One surface of the light guide plate 128 may be the opposite surface of the light guide plate 128 facing the display panel 110.

The reflection pattern 210 and / or the light absorption pattern 220 may be formed by repeating the processes described with reference to FIGS.

The reflection pattern 210 and the light absorption pattern 220 can be isolated from each other. A light absorbing pattern 220 may be formed around the reflection pattern 210. FIG. Conversely, a reflection pattern 210 may be formed around the light-absorbing pattern 220. [ The light absorption pattern 220 can reduce the voids formed by the reflection pattern 210. Conversely, the reflection pattern 210 can reduce the voids formed by the light absorption pattern 220.

Accordingly, the reflectance or absorbance by the reflection pattern 210 and / or the light absorbing pattern 220 can be further improved. This means that the color reproducibility of the display panel 110 can be further improved.

21 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.

The light L1 emitted from the optical assembly 124 may be directed to the light guide plate 128. [ At this time, the light L1 provided by the optical assembly 124 may have the distribution of light described with reference to FIG. That is, when the light L1 provided by the optical assembly 124 is provided to the display panel 110 through the light guide plate 128, the color reproducibility of the image displayed through the display panel 110 may be insufficient have.

The light L1 provided in the optical assembly 124 may be totally reflected and / or reflected by the light guide plate 128. [ At this time, the reflection pattern 210 and / or the light absorption pattern 220 may reflect, refract, and / or scatter light that is totally reflected and / or reflected by the light guide plate 128. At the same time, the light absorption pattern 220 can absorb some wavelengths of light totally reflected and / or reflected by the light guide plate 128. That is, the light L2 provided by the light guide plate 128 to the display panel 110 not only improves the color reproducibility of the image displayed through the display panel 110, but also has a uniform distribution of the light L2 It can be improved.

That is, the light guide plate 128 having the reflective pattern 210 and the light absorbing pattern 220 of the embodiment described with reference to FIG. 21 is not uniform in luminous intensity of the light L2 provided to the display panel 110, And the color reproducibility of the display panel 110 can be further improved. That is, the light guide plate 128 can provide the display panel 110 with light L2 that is bright, uniform, and has a wavelength of RGB.

22 and 23 are diagrams illustrating other examples of pattern formation according to an embodiment of the present invention.

Referring to FIG. 22, a groove may be formed on one surface of the light guide plate 128. For example, one surface of the light guide plate 128 may be processed with a laser to form a groove. A plurality of grooves may be formed in the light guide plate 128. The plurality of grooves may form the reflection pattern 230. The grooves may be formed at regular intervals, or may be formed at irregular intervals. That is, the plurality of grooves may form a regular pattern and may form an irregular pattern.

Referring to FIG. 23, a light absorbing pattern 240 may be formed on a reflection pattern 230 formed by a plurality of grooves. That is, the light absorption pattern 240 may be formed while the reflection pattern 230 is filled with the ink 200 described above. Accordingly, the reflection pattern 230 and the light absorption pattern 240 can be formed integrally.

24 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.

The light L1 emitted from the optical assembly 124 may be directed to the light guide plate 128. [ At this time, the light L1 provided by the optical assembly 124 may have the distribution of light described with reference to FIG. That is, when the light L1 provided by the optical assembly 124 is provided to the display panel 110 through the light guide plate 128, the color reproducibility of the image displayed through the display panel 110 may be insufficient have.

The light L1 provided in the optical assembly 124 may be totally reflected and / or reflected by the light guide plate 128. [ At this time, the reflection pattern 230 and / or the light absorption pattern 240 may reflect, refract, and / or scatter light that is totally reflected and / or reflected by the light guide plate 128. At the same time, the light absorption pattern 240 can absorb some wavelengths of light totally reflected and / or reflected by the light guide plate 128. That is, the light L2 provided by the light guide plate 128 to the display panel 110 not only improves the color reproducibility of the image displayed through the display panel 110, but also has a uniform distribution of the light L2 It can be improved.

25-27 illustrate other examples of pattern formation according to an embodiment of the present invention.

Referring to FIG. 25, the mask M may be disposed on the light guide plate 128 on which the reflection pattern 250 is formed. The reflection pattern 250 can be formed by the process described with reference to Fig. The mask M may be disposed on the surface of the light guide plate 128 formed on the reflection pattern 250. [ The mask M may have a plurality of holes, and the plurality of holes may form a pattern.

Referring to Fig. 26, the ink 200 is applied onto the mask M, and the ink 200 outside the plurality of holes can be removed by the squeeze SQ. Referring to Fig. 27, the ink 200 can be cured. For example, the ink 200 may be photocured by the light SL. The cured ink 200 can form the light absorbing pattern 260. The cured ink 200 may also function as a reflection pattern.

28 is a view showing an example of light reflection of a light guide plate according to an embodiment of the present invention.

The light L1 emitted from the optical assembly 124 may be directed to the light guide plate 128. [ At this time, the light L1 provided by the optical assembly 124 may have the distribution of light described with reference to FIG. That is, when the light L1 provided by the optical assembly 124 is provided to the display panel 110 through the light guide plate 128, the color reproducibility of the image displayed through the display panel 110 may be insufficient have.

The light L1 provided in the optical assembly 124 may be totally reflected and / or reflected by the light guide plate 128. [ At this time, the reflection pattern 250 and / or the light absorption pattern 260 may reflect, refract, and / or scatter light that is totally reflected and / or reflected by the light guide plate 128. At the same time, the light absorbing pattern 260 can absorb some wavelengths of light totally reflected and / or reflected by the light guide plate 128. That is, the light L2 provided by the light guide plate 128 to the display panel 110 not only improves the color reproducibility of the image displayed through the display panel 110, but also improves the uniform distribution of light .

That is, the light guide plate 128 having the reflective pattern 250 and the light absorbing pattern 260 of the embodiment described with reference to FIG. 28 is not uniformly illuminated by the light L2 provided on the display panel 110, And the color reproducibility of the display panel 110 can be further improved. That is, the light guide plate 128 can provide the display panel 110 with light L2 that is bright, uniform, and has a wavelength of RGB.

29 and 30 are views showing examples of light guide plate patterns according to an embodiment of the present invention.

Referring to FIG. 29, the reflection pattern and / or the light absorption pattern may have a uniform distribution. In other words, the reflection pattern and / or the absorption pattern may have a constant density. The reflection pattern and / or the light absorption pattern may have a constant distribution or density irrespective of changes in the longitudinal direction (L) or the width direction (W) of the light guide plate (128).

Referring to FIG. 30, the reflection pattern and / or the light absorption pattern may have a non-uniform distribution. In other words, the reflection pattern and / or the absorption pattern can have varying densities. The reflection pattern and / or the light absorption pattern may have linearity or nonlinearity depending on a change in the longitudinal direction (L) or the width direction (W) of the light guide plate (128).

For example, the reflective pattern and / or the light absorbing pattern may have a higher density at the side away from the optical assembly 124 than at the side adjacent the optical assembly 124. Alternatively, the reflection pattern and / or the light absorption pattern may have a higher density as it is closer to the side surface than the center side of the light guide plate 128. Accordingly, the light provided by the optical assembly 124 can be uniformly distributed through the light guide plate 128, and light with improved color reproducibility can be provided.

Here, the difference in distribution or density may be achieved by changing the size of the reflection pattern and / or the absorption pattern. That is, the size of the reflection pattern and / or the absorption pattern adjacent to the optical assembly 124 is small and the size of the reflection pattern and / or the absorption pattern moving away from the optical assembly 124 can be large.

In addition, the color characteristics of light can be locally varied by such a distribution or density difference. That is, by controlling the size, density, distribution, and the like of the light absorbing pattern, it is possible to control the image quality that partially deteriorates, thereby improving the overall image quality.

31 and 32 are diagrams showing examples of wavelengths of light according to an embodiment of the present invention.

The x-axis represents the wavelength of light, and the y-axis represents the intensity of light. For example, O may be 380 nm, A may be 430 nm, B may be 480 nm, C may be 530 nm, D may be 580 nm, E may be 630 nm, F may be 680 nm, G may be 730 nm and H may be 780 nm. That is, B may be the intensity or distribution of light of the blue series, G may be the intensity or distribution of light of the green series, and R may be the intensity or distribution of light of the red series.

Fig. 31 is a diagram showing a wavelength region of light absorbed by a light absorption pattern. Fig. It can be seen that the light absorption pattern absorbs light in the region between C and E. More precisely, it can be seen that the light absorbing pattern absorbs more light in the region between D and E. That is, the light absorbing pattern can absorb light in the region between the green (G) light and the red (R) light.

32 is a view showing a wavelength region of light L2 provided to the display panel 110 through the light L1 provided by the optical assembly 124 and the light guide plate 128. FIG. The intensity of the light according to the wavelength of the light L2 provided by the light guide plate 128 to the display panel 110 is reduced by about 10% in the region between C and E compared with the light L1 provided by the optical assembly 124 Can be seen. More critically, it can be seen that it is reduced by about 20% in the region between D and E. That is, it can be seen that the light of the green (G) series is distinguished from the light of the red (R) series. This means that the above-described color reproducibility can be improved.

33 to 35 illustrate examples of a display device according to an embodiment of the present invention.

Hereinafter, various embodiments of the light-absorbing pattern including the above-described light-absorbing substance will be collectively referred to as the light-absorbing section 200 for convenience of explanation.

Referring to FIG. 33, the light absorber 200 may be positioned between the optical assembly 124 and the light guide plate 128. The light absorber 200 may be located on the path of light provided from the optical assembly 124 to the light guide plate 128. The light absorber 200 may be adhered to the optical assembly 124. The light absorber 200 may absorb some wavelengths of light provided by the optical assembly 124 directly on the path of light.

At this time, the optical assembly 124 may generate heat in the process of forming light. The optical assembly 124 may generate heat as it provides light for a long time. When the light absorber 200 is bonded to the optical assembly 124, the light absorber 200 may be subjected to heat generated in the optical assembly 124. The heat can change the light absorption characteristics of the light absorbing part 200. [ The heat may weaken the durability of the light absorbing part 200.

34, the light absorber 200 may be positioned between the optical sheet 125 and the light guide plate 128. The light absorber 200 may be located on the path of light provided to the display panel 110 from the light guide plate 128. For example, the light absorber 200 may be formed of a sheet. When the light absorber 200 is formed as a sheet and positioned between the optical sheet 125 and the light guide plate 128, the influence of heat generated by the optical assembly 124 can be reduced. At this time, the light absorber 200 may be formed into a sheet and wrinkles may occur. Such wrinkles can change the light absorption characteristics of the light absorber 200 or change the optical characteristics such as refraction to light provided to the display panel 110 by the light guide plate 128. [ Further, when the light absorber is formed of a sheet, there may be a problem that the color reproducibility or the color characteristic can not be locally controlled.

Referring to FIG. 35, the light absorber 200 may be positioned on the lower surface of the light guide plate 128. The light absorber 200 may be formed on the lower surface of the light guide plate 128. The light absorber 200 may be formed on the lower outer surface of the light guide plate 128. Accordingly, the durability of the light absorber 200 can be improved.

The light absorber 200 may be positioned between the light guide plate 128 and the reflective sheet 125. The light absorber 200 may be positioned adjacent to or in contact with the reflective sheet 125. The light absorber 200 may be formed on the lower surface of the light guide plate 128. Accordingly, not only the durability of the light absorber 200 can be improved, but also the reflection caused by the lower surface of the light guide plate 128 can be improved more effectively.

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.

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 (15)

A display panel;
A light guide plate positioned behind the display panel;
An optical assembly positioned at one side of the light guide plate to provide light to the light guide plate; And,
And a light absorber formed on a rear surface of the light guide plate and absorbing a part of light provided in the optical assembly.
The method according to claim 1,
And a reflective portion formed on a rear surface of the light guide plate and reflecting the light provided from the optical assembly toward the display panel.
3. The method of claim 2,
Wherein the light absorber or the reflector forms a pattern,
Wherein the light absorption pattern or the reflection pattern has a uniform distribution or size.
3. The method of claim 2,
Wherein the light absorber or the reflector forms a pattern,
Wherein the light absorbing pattern or the reflection pattern has a non-uniform distribution or size.
3. The method of claim 2,
Wherein the light-absorbing portion and the reflective portion are integrally formed.
3. The method of claim 2,
Wherein the light-absorbing portion is formed around the reflective portion.
3. The method of claim 2,
The reflective portion is a groove formed on a rear surface of the light guide plate,
And the light absorber is located in the groove.
3. The method of claim 2,
The reflective portion is a groove formed on a rear surface of the light guide plate,
Wherein the light-absorbing portion is formed on a rear surface of the light guide plate, the light-absorbing portion being positioned around the groove.
The method according to claim 1,
The light-
A display device comprising a tetraazaporphyrin derivative.
The method according to claim 1,
The light-
A display device comprising a sub-phthalocyanine dye.
The method according to claim 1,
In some areas of the light,
Wherein the wavelength is from 530 nm to 630 nm.
The method according to claim 1,
In some areas of the light,
Green < / RTI > series and red series.
The method according to claim 1,
And the light absorbing portion is bonded to the rear surface of the light guide plate.
The method according to claim 1,
Wherein the light absorber further comprises a reflective material.
15. The method of claim 14,
The light-
Forming a less dense pattern adjacent the optical assembly and forming a more dense pattern away from the optical assembly.

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