KR20180012634A - Liquid crystal display panel and liquid crystal display apparatus comprising same - Google Patents

Abstract

The present invention relates to a liquid crystal display apparatus, and more particularly, to a liquid crystal display panel which remarkably improves contrast by preventing the reflection of external light, improves brightness due to improvement in the frontward emission efficiency of internal light, and allows the internal light to maximize the utilization of color-converted light to further improve the brightness, and a liquid crystal display apparatus including the liquid crystal display panel. The liquid crystal display panel comprises a first absorbing and reflecting polarizer, a liquid crystal part, a wave-selective light transmission layer, a color conversion layer, a wave-selective light reflection layer, and a second absorbing and reflecting polarizer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display panel and a liquid crystal display device including the liquid crystal display panel.

More particularly, the present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display device that prevents reflection of external light, significantly improves the contrast, improves the optical path of internal light, minimizes light loss in the process of converting color of internal light, The present invention also relates to a liquid crystal display panel and a liquid crystal display device including the liquid crystal display panel in which the color reproducibility is improved by improving the color purity of some of the color-converted light.

A passive display device such as a liquid crystal display (LCD) can reflect or absorb ambient sunlight or room light to realize an image. Therefore, in order to view an image to be displayed, surrounding sunlight or room light is required. However, there is a problem that if the intensity of ambient light or room light is not enough to illuminate a liquid crystal display (LCD) panel, the displayed image can not be seen. As an alternative to such a problem, a backlight unit (BLU) for backlighting a display panel is generally adopted.

The backlight unit includes a light source such as an incandescent lamp, a fluorescent lamp or a light emitting diode (LED). Korean Patent Laid-Open Publication No. 2009-0068363 discloses an example of the light source, Lt; / RTI > An image is realized by the light emitted from the light source illuminating the LCD panel. The LED provided in the backlight unit is excellent in color reproducibility and is often used as a backlight light source, and is expected to be used in the future because it is environmentally friendly.

Meanwhile, in recent years, there has been a tendency to manufacture a liquid crystal display so that it can be made portable and light in weight so that it can be used in an outdoor environment. However, there is a problem that when viewing the images outdoors, the sunlight is reflected and the contrast is degraded and the images can not be viewed properly. Such a problem is caused not only by the outdoor but also by the indoor light, and there is a problem that the external light reflected by the illumination of the indoor fluorescent lamp or the like is reflected and the contrast of the image displayed on the liquid crystal display is remarkably deteriorated.

In addition, as described above, the light weight liquid crystal display is being manufactured to be slim with respect to the thickness of the bezel. For this purpose, various optical films provided on the display are required to have a complex function and a thin thickness. However, it is technically not easy to combine the functions of the optical films.

Further, the liquid crystal display realizes the colors displayed by the image through a combination of blue / green / red through a color filter. The color filter remarkably lowers the transmittance of light passing through the liquid crystal layer, There is a problem that it is very difficult to realize a liquid crystal display that exhibits a desired level of front luminance even if the light efficiency of the light source and / or the light efficiency incident on the liquid crystal layer is significantly improved.

In addition, a conventional brightness enhancement film (DBEF), which is provided to remarkably improve the light efficiency incident on the liquid crystal layer, is very expensive and requires a very complicated manufacturing process, thereby significantly raising the production cost of the liquid crystal display.

Accordingly, it is urgently required to develop a liquid crystal display device capable of remarkably improving the front luminance, preventing deterioration of the contrast due to reflection of external light, and exhibiting such physical properties at a low manufacturing cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device capable of significantly improving the overall luminous efficiency of internal light without using an expensive brightness enhancement film.

It is another object of the present invention to provide a liquid crystal display device which achieves both the improvement of the total luminous efficiency and the minimization of the external light reflection at the same time, the manufacturing cost is reduced, the production process is simplified, and the display is made slimmer.

It is another object of the present invention to provide a liquid crystal display device in which a contrast is improved as the reflection of external light is minimized, thereby displaying an image having a clear contrast ratio.

Also, the present invention provides a liquid crystal display device that minimizes light loss when internal light is color-converted and maximizes the utilization of color-converted light by emitting color-converted light to the front of a display panel as much as possible There is another purpose.

Further, another object of the present invention is to provide a liquid crystal display device in which the color purity of some of the color-converted light is improved to further broaden the color reproduction range.

In addition, the present invention minimizes optical loss during color conversion of internal light, maximizes the output of the color-converted light over the entire display panel, improves the color purity of some of the color-converted light to broaden the range of color reproduction, Another object is to provide a liquid crystal display panel in which the contrast is remarkably improved.

According to an aspect of the present invention, there is provided a backlight unit including a reflective member, a backlight unit disposed above the reflective member, the backlight unit including a light source that emits light in a first wavelength range, and a backlight unit disposed above the backlight unit, And a display panel for displaying an image by emitting light upward, wherein the display panel absorbs a second polarized light incident from above the first polarized light and the second polarized light whose polarization axes are orthogonal to each other, A first absorption reflective polarizer that reflects the polarized light and transmits the first polarized light; A liquid containing a liquid crystal layer; A wavelength-selective light-transmitting layer that transmits light of the first wavelength band and reflects light of a wavelength longer than the first wavelength band; A color conversion layer including a fluorescent film which is excited by the light of the first wavelength band and emits light having a longer wavelength than the first wavelength band; A wavelength-selective light reflection layer that at least partially reflects the second wavelength band light of the emitted long wavelength light, and transmits light of a wavelength different from the second wavelength band; And a second absorption reflective polarizer which absorbs the first polarized light incident from above and reflects the first polarized light incident from below and transmits the second polarized light, Device.

According to a preferred embodiment of the present invention, the first wavelength band is included in the blue wavelength region or the ultraviolet wavelength region, and when the first wavelength band is included in the blue wavelength region, the second wavelength band is included in the green wavelength region, When the first wavelength band is included in the ultraviolet wavelength range, the second wavelength band may be included in the blue wavelength range or the green wavelength range.

According to another preferred embodiment of the present invention, in the backlight unit, the light source is disposed on the side of the backlight unit, and the light guide member guiding the light incident from the light source and disposed on the reflective member to emit the light toward the display panel .

According to another preferred embodiment of the present invention, the backlight unit may be arranged such that the light emitted from the light source directly faces the back surface of the display panel.

According to another preferred embodiment of the present invention, the first polarized light of the external light incident from above the display panel is absorbed by the second absorption reflective polarizer, and the second polarized light of the external light is transmitted through the second absorption reflective polarizer It is incident on the first absorption reflective polarizer and then absorbed by the first absorption reflective polarizer, so that the contrast ratio can be improved.

According to another preferred embodiment of the present invention, the second polarized light of the internal light emitted from the light source is incident on the first absorption reflective polarizer and the reflection member, Is changed and transmitted to the upper portion of the first absorption reflective polarizer, the brightness can be improved.

According to another preferred embodiment of the present invention, the first polarized light of the internal light transmitted upward of the liquid crystal unit is reflected by the second absorption reflective polarizer, and then incident on and reflected by the reflection member, So that the luminance can be improved.

According to another preferred embodiment of the present invention, the color conversion layer is emitted with the light having a wavelength longer than that of the first wavelength band, which is emitted downward, enters the wavelength selective light transmission layer and is then reflected upward, A part of the light having a wavelength longer than that of the first wavelength band emitted and directed upward is reflected by the second absorption reflective polarizer and then reflected upward from at least one of the wavelength selective light transmitting layer and the wavelength selective light reflecting layer The brightness can be improved.

According to another preferred embodiment of the present invention, micro-cavities for the second wavelength band light are formed between the wavelength-selective light-transmitting layer and the wavelength-selective light-reflecting layer, thereby improving the purity of the second wavelength band light color.

According to another preferred embodiment of the present invention, the first absorption reflective polarizer includes a plurality of first grids spaced apart from each other so that the longitudinal direction thereof is perpendicular to the polarization axis of the second polarized light, and the second absorption The reflective polarizer may have a plurality of second grids spaced apart from one another such that the longitudinal direction thereof is perpendicular to the polarization axis of the first polarized light.

According to another preferred embodiment of the present invention, a single said first grid and a single said second grid may be a stack of alternating layers of metal and insulating layers.

According to another preferred embodiment of the present invention, the laminate includes a first laminate and a first metal layer in which a first metal layer, a first insulating layer and a second metal layer are laminated on the basis of an upper direction of the display panel, , A second metal layer, and a second laminate in which a second insulating layer is laminated.

According to another preferred embodiment of the present invention, the metal layer may have a thickness of 30 to 500 nm.

According to another preferred embodiment of the present invention, when the light of the first wavelength range is included in the wavelength range of the ultraviolet region, the color conversion layer includes a blue fluorescent film, a green fluorescent film and a red fluorescent film, When the light is included in the wavelength range of the blue region, the color conversion layer may include a green fluorescent film and a red fluorescent film.

According to another preferred embodiment of the present invention, the fluorescent film may include at least one of a fluorescent material, a quantum dot, and an organic light emitting material.

According to another preferred embodiment of the present invention, the backlight unit may further include an optical film on a light path until the light emitted from the light source enters the display panel.

According to another preferred embodiment of the present invention, a micro cavity for the second wavelength band light is formed between the second absorption reflective polarizer and the wavelength selective reflection layer to improve the purity of the second wavelength band light color.

According to another aspect of the present invention, there is provided a liquid crystal display panel for displaying an image by emitting light of a first wavelength band incident from below a liquid crystal layer to above a liquid crystal layer, Board; A first absorption reflective polarizer which absorbs second polarized light incident from above the first polarized light and the second polarized light whose polarization axes are orthogonal to each other, reflects the second polarized light incident from below, and transmits the first polarized light; A liquid containing a liquid crystal layer; A wavelength-selective light-transmitting layer that transmits light of the first wavelength band and reflects light of a wavelength longer than the first wavelength band; A color conversion layer including a fluorescent film which is excited by the light of the first wavelength band and emits light having a longer wavelength than the first wavelength band; A wavelength-selective light reflection layer that at least partially reflects the second wavelength band light of the emitted long wavelength light, and transmits light of a wavelength different from the second wavelength band; A second absorption reflective polarizer that absorbs the first polarized light incident from above, reflects the first polarized light incident from below, and transmits the second polarized light; And an upper substrate sequentially in the lower direction to the upper direction.

The present invention also provides a liquid crystal display device including the liquid crystal display panel according to the present invention.

Hereinafter, terms used in the present invention will be described.

As used herein, the term "upper" means the entire region located above the reference plane, and does not mean only a space defined by the upper region corresponding to the reference plane. Also, "downward" means the entire area located below the reference plane, and does not mean only a space defined by the lower area corresponding to the reference plane. The terms " upward "and" downward "are terms used to more easily describe the positional relationship of the components. The terms " upward " and " downward "

The term " light incident / emitted from above / below " as used in the present invention is merely a macroscopic description of the direction of light based on a configuration on the light path in the liquid crystal display device, But is not limited to the angle of incidence and the angle of incidence of emitted light.

The term " second configuration " as used in the present invention means a configuration in which the first configuration, the second configuration, the second configuration, the second configuration, But also includes a case where at least one configuration such as a third configuration is further interposed between the first configuration and the second configuration as well as the case where it is directly arranged.

The term "first polarized light" and "second polarized light " used herein refer to light whose polarization axes are orthogonal to each other. For example, the first polarized light may be p-wave or s- 2 polarized light can be s-wave or p-wave.

According to the present invention, it is possible to remarkably improve the total luminous efficiency of the internal light even without using a high-priced brightness enhancement film, to achieve a total luminous efficiency improvement and a minimum external light reflection at the same time by a single member, And a liquid crystal display device that is more easily slimmed can be realized. In addition, as the reflection of external light is minimized, the contrast is improved and an image having a clear contrast ratio can be displayed. Further, the light loss when the internal light is color-converted is minimized, and the color-converted light is emitted to the front as much as possible, thereby maximizing utilization of the color-converted light and further improving the luminance. In addition, since the color purity of some of the color-converted light is improved, it is very suitable for realizing a liquid crystal display device having a wider color reproduction range.

1 is an exploded perspective view of a liquid crystal display according to an embodiment of the present invention,
Fig. 2 is a sectional view of the liquid crystal display panel 100 in Fig. 1,
3A is a schematic view showing an external light path inside the liquid crystal display device with respect to external light incident on a display panel of a conventional liquid crystal display device,
FIG. 3B is a schematic view illustrating an external light path inside the liquid crystal display device with respect to external light incident on the display panel of the liquid crystal display device according to an embodiment of the present invention,
4 is a schematic view of an optical path in which internal light is recycled between a first absorption reflective polarizer and a reflective member in a liquid crystal display device according to an embodiment of the present invention,
FIG. 5 is a schematic view of an optical path of a first polarized light that has passed through a first absorption reflective polarizer in a liquid crystal display device according to an exemplary embodiment of the present invention, and a path along which a further internal light is recycled,
6 is a schematic view showing an optical path in which color-converted light is recycled between a wavelength-selective light-transmitting reflective layer, a color conversion layer, and a second absorption reflective polarizer of a display panel of a liquid crystal display device according to an embodiment of the present invention,
7 is an exploded perspective view of a second absorption reflective polarizer and a first absorption reflective polarizer included in an embodiment of the present invention,
Fig. 8 is a cross-sectional enlarged view of the first grid portion of the first absorption reflective polarizer in Fig. 7,
FIG. 9 is a sectional view of a first grid portion in a further embodiment of the present invention,
FIG. 10 is a schematic diagram illustrating optical paths between a wavelength-selective light-transmitting layer and a wavelength-selective light-reflecting layer of a display panel included in an embodiment of the present invention,
11 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention, and
12 is a cross-sectional view of a backlight unit included in an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

1, a liquid crystal display 1000 according to an embodiment of the present invention includes a display panel 100 and a backlight unit 200, and supports the display panel 100 and the backlight unit 200 And a protective member 300 that protects the display panel 300.

First, the display panel 100 will be described.

The display panel 100 is disposed above the backlight unit 200 and emits light upward from below to display an image. 2, the display panel 100 includes a first absorption reflective polarizer 20, a liquid crystal 30, a wavelength selective light transmitting layer 30, A first substrate 11 (not shown) disposed in the lower portion of the first absorption reflective polarizer 20 is provided in this order from the first absorption reflective polarizer 20 to the first absorption reflective polarizer 20 in the order of the color conversion layer 50, the wavelength selective reflection layer 70, And a second substrate 12 disposed on the upper portion of the second absorption reflective polarizer 60.

The first absorption reflective polarizer 20 is a polarizer that transmits first polarized light in the first polarized light and polarized light polarized in the second polarized light orthogonal to each other and absorbs or reflects the second polarized light. ), The transmitted polarized light, and the polarized light absorbed or reflected are opposite to each other.

The optical characteristics of the first absorptive reflective polarizer 20 may be expressed as follows. Whether the absorptive function is exhibited with respect to the second polarized light or the reflective function is expressed with respect to the second polarized light is determined by whether the polarized light incident on the polarizer The second polarized light incident on the backlight unit 200 side is reflected and the second polarized light incident on the liquid crystal unit 30 side is absorbed and the complex function can be expressed through a single polarizer.

More specifically, FIG. 3B is a schematic view illustrating an optical path of external light OL incident on a display panel of a liquid crystal display according to an exemplary embodiment of the present invention. Referring to FIG. 3B, b ₂ and b ₃ are transmitted through the second absorption reflective polarizer 60 and the liquid crystal unit 30 and are incident on the upper surface of the first absorption reflective polarizer 20. The incident second polarized light b ₄ May be absorbed by the first absorption reflective polarizer 20. [

4 is a schematic diagram illustrating an optical path of an internal light IL emitted from a light source of a backlight unit in a liquid crystal display according to a preferred embodiment of the present invention. The first polarized light C ₁ 'Is transmitted through the first absorption reflective polarizer 20''to the liquid crystal unit 30''and the second polarized light d ₁ ' of the emitted internal light IL is incident on the first absorption reflective polarizer 20 ''. As shown in FIG.

That is, as shown in FIG. 3B and FIG. 4, the second polarized light d ₄ incident from above the first absorption reflective polarizers 20, 20 "is absorbed and the second polarized light d ₁ ' , d ₂ ', d ₃ ') are reflected, and such a function can be performed simultaneously through a single absorption reflective polarizer.

Comparing the external light control of a liquid crystal display device according to an embodiment of the present invention with a conventional liquid crystal display device, as shown in FIG. 3A of a typical liquid crystal display device, And an absorbing prism 60 'for transmitting the second polarized light. The absorption type photon 60 'absorbs (a ₂ ') the first polarized light a ₁ 'of the external light OL incident on the display panel and the second polarized light b ₁ ' Is incident on the reflection type photon 20 'which transmits (b ₂ ') the absorption type photon 60 'through the liquid portion 30' and transmits the first polarized light and reflects the second polarized light, the second polarization is ₍₃ b ') is reflected (b _4') is liquid state (30 ') pass (b _5'). However, passing through the liquid crystal a second polarization (b ₅ ') is absorbed poorly photons (60 failed to suppress the reflection of external light according As then incident on), pass through (b _6') to the upper portion of the display panel is a problem that contrast is lowered .

To solve this problem, an ordinary liquid crystal display device further includes an absorptive polarizer (not shown) that absorbs the second polarized light and transmits the first polarized light between the liquid crystal portion 30 'and the reflective polarizer 20' However, in this case, it is difficult to realize a slimmed display panel due to the insertion of the absorbing photons, resulting in an increase in manufacturing cost. 3B, a liquid crystal display according to an exemplary embodiment of the present invention may include a first absorption reflective polarizer 20 (FIG. 3B) without a separate absorption type photon between the liquid crystal unit 30 and the first absorption reflective polarizer 20, a second polarization (b _3), which is incident from the upper side of) it is possible to minimize the reflection of external light according to the can be absorbed, it is possible to improve the contrast.

In the case of a polarizer that exhibits optical characteristics as described above with respect to the first polarized light and the second polarized light, the first absorptive and reflective polarizers 20 and 20 "included in the liquid crystal display device according to the present invention are limited none.

For example, a conventional reflective polarizer (for example, an optically isotropic material layer and an optically anisotropic material alternately laminated in a multi-layered structure in which the first absorption reflective polarizer transmits the first polarized light and reflects the second polarized light irrespective of the incident surface A cholesteric reflective polarizer, a wire grid-type reflective polarizer, etc.) in which an optically anisotropic dispersion or optically isotropic dispersion is dispersed in a reflective polarizer, an optically isotropic matrix or an optically anisotropic matrix, (E.g., a polyvinyl alcohol (PVA) film with iodine doping, or a combination of tourmaline, herapathite, cholesteric polymers, and the like), which transmit one polarized light and absorb the second polarized light A film containing the same dichroic crystals, or a film obtained by stretching these films).

However, in order to realize the above-mentioned optical characteristics, it is difficult to realize a slimmed display panel because the thickness of the first absorption reflective polarizer is increased by laminating the two films, and the process of joining two kinds of films in a panel manufacturing process is separately The process complexity that must be performed may increase. Further, in the case of a multilayer reflective polarizer widely used as a reflective polarizer, there is a problem that the manufacturing cost of the liquid crystal display device can be significantly increased because the unit price is high.

7, the first absorption reflective polarizer 20 included in one preferred embodiment of the present invention includes a plurality of first grids 20 arranged in parallel to each other so as to be perpendicular to the polarization axis of the first polarized light, ), And the plurality of first grids 20 may be an in-cell polarizer formed directly on the first substrate 11.

The plurality of first grids 20 may be arranged such that the grids are spaced apart from each other in the longitudinal direction and the longitudinal direction of the grids is perpendicular to the transmission axis of the first polarized light to be transmitted, The first polarized light is transmitted and can not be transmitted through the second polarized first absorption reflective polarizer 20. [

The spacing distance (l-w in FIG. 8) between any one of the plurality of first grids 20 and the adjacent adjacent grids may be the same or partially the same, or the spacing between all the grids may be different from each other . In addition, the width (w in Fig. 8) of each of the plurality of grids 20 may be implemented such that all the grids are substantially the same, some are different, or all are different. Further, the intervals (ℓ in FIG. 8) between the plurality of grids 20 may be substantially all the same or some differently implemented, or all of them may be implemented differently. In addition, the thicknesses (t in FIG. 8) of the plurality of grids 20 may be substantially all the same or some differently implemented, or all differently.

At this time, the width w and / or the thickness t of each of the grids may be related to the wavelength range of the incident light capable of separating the first polarized light and the second polarized light. For example, in the incident light of the visible light wavelength range band When used as a polarizer, any one of the grid width w may be 10 to 500 nm and the thickness t may be 50 to 500 nm. In addition, the interval l between the grids may be related to the resolution for separating the first polarized light and the second polarized light from the incident light. If the interval l between the grids is shorter than the wavelength of the incident light, 20 can mainly perform the polarization function, whereas when the interval (l) between the grids is longer than the wavelength of the incident light, optical characteristics of diffraction can be expressed rather than polarization. Preferably, the spacing (l) between the grids may be between 50 and 300 nm.

On the other hand, the plurality of grids 20 are Fe, Co, V, Ti, Al, Ag, Si, Cr, Mo, Ge, Y, Zn, Zr, W, Ta, Cu, or metal, such as Pt, SiO _x ( _x ? 1), SiN _x ( _x ? 1), MgF ₂ , CaF ₂ , Al ₂ O ₃ or SnO ₂ , or a conductive material such as ITO, IZO, ZnO or In ₂ O ₃ . At this time, the insulating material or the conductive material may be transparent so as not to lower the light transmittance.

At this time, the grid made of a metal usually has a high extinction coefficient k, so that the absorbability of light oscillating in a specific direction can be improved, but at the same time, the reflectance at the metal surface is also high so that external light incident on the grid surface is reflected. There is a problem that the contrast is reduced. If a material having a high extinction coefficient (k) and a low surface reflectance is used, the second polarized light (b ₃ ) of the external light passing through the liquid crystal portion 30 is absorbed by the first absorption reflective polarizer 20 (b ₄ ) and the reflection can be minimized so that the contrast can be improved.

However, the first absorption reflective polarizer including a grid implemented with a material having a high extinction coefficient (k) and a minimized surface reflectance may fail to exhibit the optical recycling effect according to the optical path as shown in FIG. In other words, the second polarized light of the internal light IL is not reflected by the first absorption reflective polarizer 20 '', but is entirely absorbed or almost absorbed, thereby greatly reducing the brightness of the liquid crystal display device. Only light having a level of 50% can be used for the visualization of the image, so that a remarkable decrease in the light use efficiency may be a problem.

Accordingly, the first absorption reflective polarizer 20 included in the preferred embodiment of the present invention is implemented as a plurality of first grids 20 spaced apart in the longitudinal direction, Or a laminated body in which a layer formed of a resin is laminated.

8, the grid 21 formed on the first substrate 11 includes a first metal layer 21a, an insulating layer 21b, and a second metal layer 21c ) May be stacked. At this time, also the passing through the liquid state 30, external light as in 3b the second polarization (b ₃₎ is the second first reflected light (not shown), which is reflected at the second metal layer (21c), the surface of the grid (21) A second reflected light (not shown) that is reflected by the first metal layer 21a after sequentially passing through the metal layer 21c and the insulating layer 21b can be made. The first reflected light and the second reflected light have a predetermined phase difference I have. If the thicknesses and the refractive indexes of the second metal layer 21c and the insulating layer 21b are appropriately adjusted to cause the phase difference between the first reflected light and the second reflected light to be canceled, a second polarization (b ₃₎ of the external light it can be substantially absorbed (b ₄₎ from the first absorption reflective polarizer (20 ").

However, even when the first reflected light and the second reflected light have a phase difference that can cause destructive interference, the intensities of the first reflected light and the second reflected light may be different, and the intensity of the second reflected light may be weak The light transmitted through the second metal layer 21c must be reflected at the first metal layer 21a as much as possible so that the reflectance of the first metal layer 21a is greater than that of the second metal layer 21c. .

On the other hand, the first absorbing and reflecting polarizer 20 needs to reflect the second polarized light at the lower surface of the backlight unit side as much as possible, so that the light recycling effect becomes larger. For this, the first metal layer 21a of the grid included in the preferred embodiment of the present invention preferably has a large thickness so that the second polarized light can not be transmitted. In order to suppress the absorption of the second polarized light, It is preferable to use a metal of a material whose surface reflectance is remarkably high.

The thickness of the first metal layer 21c of the grid included in the preferred embodiment of the present invention may be 20 to 500 nm and the extinction coefficient k may be 1.48e + 6 cm ^-1 or less at a wavelength of 500 nm, Is preferably arranged to have a metal content of 85% or more, more preferably 90% or more, still more preferably 95% or more, and still more preferably 99.9% or more at a thickness of 100 nm with respect to a wavelength of 500 nm.

9 is a partial cross-sectional enlargement of a first absorption reflective polarizer according to another preferred embodiment of the present invention. The single grid 22 includes a first metal layer 23a, An insulating layer 23b, a second metal layer 23c, and a second insulating layer 23d may be sequentially stacked. In this case, in order to absorb the second polarized light among the light incident from the liquid crystal side, the phase difference of reflected light, which is reflected from the surface of the second metal layer 23c and the surface of the first metal layer 23a, The second polarized light among the external light incident on the liquid-crystal side is substantially absorbed by the first absorption reflective polarizer 20, thereby minimizing the reflection of external light. At this time, the thickness and the refractive index of the first insulating layer 23b, the second metal layer 23c, and the second insulating layer 23d may be appropriately adjusted so that the phase difference of the reflected light has a phase difference at which the destructive interference occurs .

On the contrary, in order to reflect the second polarized light among the light incident on the backlight unit side, the thickness of the first metal layer 23a is such that the second polarized light can not transmit, and the high reflectance and the low absorption coefficient k ). ≪ / RTI >

The thickness of each of the plurality of grids included in the first absorption reflective polarizer 20 and the number of stacked layers in the case of a stacked body may be all implemented in the same manner or may be implemented in different ways.

The first substrate 11 on which the first absorptive reflective polarizer 20 can be formed on one side may be any one of a glass substrate, a quartz substrate, a sapphire substrate, a plastic substrate, and a flexible polymer film which can be bent. More preferably, the first substrate 11 may be transparent. However, the present invention is not limited to the above-described types, and any type of substrate used for a display panel of a liquid crystal display can be used.

The area of the first substrate 11 may be determined according to the area of the display panel, and the thickness of the first substrate 11 may be 100 m to 1 mm, but is not limited thereto.

Next, a description will be given of a liquid portion 30 disposed on the first absorption reflective polarizer 20.

The liquid crystal unit 30 includes a liquid crystal layer 33 and can control the polarization of light passing through the liquid crystal layer 33 to display a desired image. That is, the liquid crystal layer 33 has a different arrangement of liquid crystals depending on whether a voltage is applied thereto. The polarized light incident on the liquid crystal layer is transmitted through the liquid crystal layer 33 as it is or its phase is changed. Specifically, as shown in FIG. 5, the light incident from the first absorption reflective polarizer 20 '' below the liquid crystal unit 30 'is a first polarized light C ₁ , and the first polarized light C ₁ is not supplied with power The polarizing plane rotates in the twisted direction of the liquid crystal. For example, when the polarizing plane rotates by 90 degrees, the polarized light is emitted as the second polarized light d ₂ . In addition, when the first polarized light C ₁ passes through the liquid crystal part to which power is applied, the first polarized light C ₁ is emitted as the first polarized light C ₂ without changing its phase as the liquid crystal is arranged in one direction . At this time, the first polarized light c ₂ or the second polarized light d ₂ emitted from the liquid crystal portion 30 enters the second absorption reflective polarizer 60 ", and the second absorption polarized light polarizer 60" by absorbing the first polarization (c ₂₎ incident from the lower side, and the vision second polarization (d ₂₎ it is transmitted by, the applied liquid crystal part, the power is demonstrated in black, bright liquid crystal portion not applied with a power source, The image can be displayed on the display panel.

The liquid crystal layer 33 provided in the liquid crystal unit 30 can be used without limitation in a liquid crystal provided in a conventional light receiving panel, so that the present invention is not particularly limited thereto.

A transparent substrate (Ex. Glass substrate) may be provided on the upper and lower surfaces of the liquid crystal layer 33. At this time, an electric signal received from the driving circuit is transferred to the liquid crystal layer The electrode pattern layers 31a and 31b (Ex. TFT pattern) that can be transferred can be formed. The electrode pattern layer may be formed of an electrode structure such as a gate electrode, a pixel electrode, or the like, which is employed in a liquid crystal display device. The material, the electrode thickness, and the electrode width may be formed into a material, thickness, For example, the material of the electrode may be formed of ITO.

At this time, the glass substrate on which the electrode pattern layer is formed may be provided with control layers 32a and 32b for controlling initial alignment state of liquid crystal molecules, and the control layer may be, for example, a polyimide coating layer. The polyimide (PI) coating layer has a role of aligning the chemical and structural arrangement of the PI surface physically in one direction through the rubbing process after coating so that the liquid crystal in contact with the PI is more easily aligned in a certain direction I am responsible.

The liquid crystal display 30 may further include a liquid crystal display unit included in the liquid crystal display, and the liquid crystal display of the present invention will not be described in detail.

However, the liquid level portion 30 may not include a color filter. A typical light receiving display has a color filter to express the color of a displayed image, but the color filter has a problem of significantly lowering the light transmittance through the liquid crystal portion. Accordingly, even if the optical recycling efficiency is significantly improved through the first absorption / reflection polarizer 20 as described later with reference to FIG. 4, the internal light may not exit the liquid crystal unit 30 to a desired level, It can be directly connected with deterioration.

In order to solve such a problem, the liquid crystal display according to an embodiment of the present invention does not include a color filter, and a fluorescent film (not shown) is formed on the upper portion of the wavelength selective light transmitting layer 40 disposed on the liquid portion 30 And a color conversion layer 50 including a color conversion layer.

Before describing the wavelength-selective light-transmissive layer 40, a color conversion layer 50 that implements a color image, and which can ensure luminance without lowering the amount of incident light from the backlight unit will be described.

The liquid crystal display according to the present invention does not include a color filter in the display panel 100 and is provided with a color conversion layer 50 implemented as a fluorescent film instead of using a color filter to reduce the transmittance of light passing through the color conversion layer, Since light can be emitted to the front surface, a display having improved luminance can be realized.

The color conversion layer 50 may include a fluorescent film containing at least one of a fluorescent material, a quantum dot, and an organic light emitting material. At this time, if the light emitted from the light source 211 of the backlight unit 200 belongs to the wavelength range of the ultraviolet region to realize white, the fluorescent film may include at least a blue fluorescent film, a green fluorescent film and a red fluorescent film . When the light emitted from the light source 211 belongs to the wavelength range of the blue region, the fluorescent film may include at least a green fluorescent film and a red fluorescent film. In addition, the fluorescent film may further include a fluorescent film such as amber, greenish yellow, have.

The fluorescent material capable of realizing the blue fluorescent film, the green fluorescent film and the red fluorescent film, the quantum dot, and the organic luminescent material may be known materials, and thus the present invention is not particularly limited thereto.

For example, when the blue fluorescent film is a phosphor, at least one compound selected from the group consisting of oxides, sulfide nitrides, oxynitrides, and fluorides doped with Eu 2+, Mn 2+, or Mn 4+; , perovskite and the like, and in the case of an organic luminescent material, 4,4'-bis (2,2-diphenylvinyl) -1,1'-iphenyl), polyvinylcabazole, poly-phenylemevinylene and polyalkylthiophene (4-biphenyl) -3,8-diphenylpyrene, 1,3,6,8-tetrabiphenylpyrrene and 1-phenyl -3,6,8-triphenylpyrene, and the like.

Further, when as an example, the green fluorescent film phosphor Eu ^{2 +} doping being at least one member selected from the group consisting of a nitride compound, may be a quantum dot when the InP / ZnS, when the organic light emitting material Alq (tris- (8 -hydroxyquinoline aluminum, BeBq2 (bis (benzoquinoline), etc.).

For example, when the red phosphor is a phosphor, it may be KSF: Mn4 + doped with Eu4 +, InP / ZnS may be a quantum dot, and Eu (DBM) ₃ (phen) .

The color conversion layer 50 may be formed by patterning on the wavelength selective light transmitting layer 40 such that each color, for example, a green fluorescent film and a red fluorescent film corresponds to a designated color region of a subpixel, The first wavelength band light, for example, blue light, can be transmitted through the portion where the green or red fluorescent film is not formed, without wavelength conversion, so that a desired color can be realized by a combination thereof.

The wavelength-selective light-transmissive layer 40 functions to emit the light of the first wavelength band transmitted through the liquid crystal portion 30 to the upper side of the display panel as much as possible and to reflect the light of longer wavelength than the light of the first wavelength band . For example, when the light source provided in the backlight unit is blue light and the color conversion layer 50 includes a green fluorescent film and a red fluorescent film and is patterned, the wavelength selective light transmitting layer 40 has a longer wavelength than blue It is possible to reflect green light and red light.

Specifically, as shown in FIG. 6, the blue light incident from a liquid portion (not shown) located below the wavelength selective light transmitting layer 40 is transmitted through the wavelength selective light transmitting layer 40 (T ₁ ) The red fluorescent film and / or the green fluorescent film of the layer 50 is excited to emit red light and / or green light. At this time, the red light and / or the green light emitted upward (T ₂₁ ) are emitted to the upper side of the display panel through the second absorption reflective polarizer 60 and the red light and / or the green light emitted downward (T ₂₂ ) The light can be reflected by the selective light transmitting layer 40 and then emitted toward the upper side of the display panel, thereby improving the utilization efficiency of the color-converted light. In addition, the red and / or green light incident on the second absorption reflective polarizer 60 may be partially reflected (R ₂ ) in the second absorption reflective polarizer 60, which is reflected by the wavelength-selective light-transmitting layer 40 And the upper side of the display panel can be improved and emitted, the utilization efficiency of the color-converted light can be further improved.

In the sub-pixel region of the color conversion layer 50 not patterned with the green fluorescent film or the red fluorescent film, blue light is transmitted as it is, about 50% of the blue light transmitted through the second absorption reflective polarizer 60, Can be reflected. At this time, since the back-reflected blue light passes through the wavelength-selective transmission filter 40 and is then reflected by the reflective member 210 disposed on the rear surface of the backlight unit 200 and can be returned to the front surface of the display panel, It is possible to minimize the loss of light transmitted through the display panel 30, thereby further improving the overall luminous efficiency of the display panel.

The wavelength-selective light-transmitting layer 40 may be a multilayer film in which a thin film of a high-refraction / low-refractive material is repeated. For example, the multilayer film may transmit blue light, (0.125) may be a _{SiO 2 /(0.25)TiO 2 /(0.125)SiO 2] m} (m = repeat stories, m is more than 5). The thickness of the wavelength-selective light-transmitting layer 40 may be 0.5 to 10 탆, but is not limited thereto. The method of forming the wavelength selective light transmitting layer 40 may be e-beam, sputtering, or atomic deposition, but is not limited thereto.

Next, the wavelength-selective light reflection layer 70 disposed on the color conversion layer 50 will be described.

The wavelength selective light reflecting layer 70 reflects at least part of the light of the second wavelength band that is longer than the light of the first wavelength band among the light emitted from the color conversion layer 50. The light of the wavelength different from that of the second wavelength band Transmitting function. Thus, a micro cavity for the second wavelength band light can be formed between the wavelength-selective light-transmitting layer 40 and the wavelength-selective light-reflecting layer 70, and a micro cavity for the second wavelength band light can be formed between the wavelength- As the reflection and the retroreflection are repeated, the band width of the second wavelength band light can be reduced to further improve the purity of the second wavelength band light color.

For example, when the light of the first wavelength range is blue light, the light of the second wavelength range may be green light or red light. However, in the case of the red light, since the degree of enhancement of the color purity of the red light is smaller than that when the band width of the green light is decreased, the light of the second wavelength range preferably has the green light wavelength have. 10, blue light (b ₁ , b ₂ ) transmitted through the wavelength-selective light-transmitting layer 40 is transmitted through the color conversion layer 50 of the red fluorescent film R and the green fluorescent film G And then emitted as red light (R ₁ ) and green light (G ₁ ), respectively. At this time, when the second wavelength band reflected by the wavelength selective reflection layer 70 is included in the wavelength region of the green light, the emitted red light R ₁ transmits (R ₂ ) through the wavelength selective light reflection layer 70. However, the green light G ₁ enters the wavelength-selective light reflection layer 70, and only a part thereof is transmitted (G ₂₁ ) and the rest is reflected downward. The reflected green light G ₂₂ passes through the color conversion layer 50 And is further reflected upward from the rear wavelength selective light transmitting layer 40. The re-reflected green light G ₃ is incident on the wavelength-selective light reflection layer 70, a portion of the light is transmitted, and a part of the green light G ₃ is reflected again to repeat the reflection and the retroreflection between the wavelength-selective light transmission layer 40 and the reflection layer 70 do. When the destructive interference and the constructive interference are generated in such an optical path, the light of the central wavelength is maintained or strengthened in the wavelength range of the green light, the light of the remaining wavelength may be weakened in intensity, and the green light, The color reproduction range of the liquid crystal display device can be broadened through the green light having improved color purity as it passes through the color filter 70. In this case, in order to generate the destructive interference and the constructive interference in the optical path to form the micro cavity for the green light, the thickness of the color conversion layer, especially the green fluorescent film, positioned on the optical path is important. By controlling the thickness of the green fluorescent film, Can be adjusted.

For example, when the first wavelength band is included in the ultraviolet region, the light in the second wavelength range may be any one of blue light, green light, and red light, and the second wavelength light may be blue light or green light It can be light.

The wavelength selective light reflecting layer 70 may be a conventional dichroic mirror that reflects light of a specific wavelength band and transmits light of the remaining wavelength band. For example, when the light of the second wavelength band is green, the wavelength selective light reflecting layer 70 may be a green dichroic mirror. In addition, the wavelength-selective light reflecting layer 70 may reflect at least part of the light of the second wavelength band to maintain the front luminance of the second wavelength band light color over a certain level.

Next, the second absorption reflective polarizer 60 provided on the above-described wavelength-selective light reflection layer 70 will be described.

The second absorption reflective polarizer 60 has a function of absorbing the first polarized light incident from above, reflecting the first polarized light incident from below, and transmitting the second polarized light having the polarization axis orthogonal to the first polarized light do. Specifically, the external light first polarized light incident from the upper portion of the the display panel as shown in Figure 3b (a ₁₎ is approximately of the external light incident on the display panel according As absorption (a ₂₎ in the second absorbing reflective polarizer 60 50% is first attenuated by the second absorption reflective polarizer 60, thereby contributing to the improvement of the contrast.

In addition, the luminous efficiency of the entire display panel through the internal light IL emitted from the backlight unit through the second absorption reflective polarizer 60 can be greatly improved. 5, when the internal light IL passes through the first absorption reflective polarizer 20 '', only the first polarized light c ₁ is directed toward the liquid crystal unit 30 ''. At this time, The first polarized light C ₁ passing through the region where power is not applied (OFF) is changed in phase by the liquid crystal layer of the liquid crystal portion 30 "and emitted as the second polarized light d ₂ , The second polarized light d ₂ implements a part of the image that is brightly seen through the second absorption reflective polarizer 60 ". Also, the power ON area of the liquid crystal 30 " The first polarized light c ₁ passing therethrough is emitted as the first polarized light c ₂ whose phase is unchanged and the emitted first polarized light c ₂ is incident on the second absorption reflective polarizer 60 " , The reflected first polarized light C ₃ can be recycled through the liquid portion 30 ", the first absorption reflective polarizer 20", and the reflective member 210 and the final second polarized light d ₈ 2 absorption reflective polarizer 60 " As it may be emitted. The light traveling path in the liquid crystal display device significantly improves the luminous efficiency to the front surface of the display panel when the optical path of the liquid crystal display device is compared. Specifically, in the case of a typical liquid crystal display device, an absorbing piece-shaped photon having a function of first polarized light absorption and second polarized light transmission is provided instead of the second absorption reflective polarizer 60 "as shown in Figure 5. In this case, (30 ") when the first polarized light incident from the lower side (c ₁₎ the liquid state (30" emits a), some of which changes the phase in a second polarization (d _2), rest of the first polarization (c ₂₎ The first polarized light c ₂ which has not been changed in phase is absorbed by the absorbing photon, and the first polarized light c ₂ is again recycled (the second polarized light d _{8 in} FIG. 5) Etc.), the front luminance of the conventional liquid crystal display device is significantly lower than that of the liquid crystal display device according to the embodiment of the present invention.

The second absorption reflective polarizers 60 and 60 " are polarizers that absorb the first polarized light incident on one side and reflect the first polarized light incident on the other side, and transmit the second polarized light on both sides The second polarized light may be transmitted through the second polarized reflection prism, irrespective of the incident surface, to the upper portion of the normal polarized light that transmits the second polarized light and reflects the first polarized light irrespective of the incident surface, However, in order to realize the above-described optical characteristics, when the first absorption reflective polarizer is formed by laminating the two films, the thickness of the first absorption reflective polarizer is increased, And the process complexity of separately performing a process of laminating two kinds of films in a panel manufacturing process may increase. The second absorption reflective polarizer 60.60 "included in the preferred embodiment includes a plurality of second grids 60 spaced apart from each other such that the longitudinal direction thereof is perpendicular to the polarization axis of the second polarized light, as shown in FIG. 7 And the plurality of second grids 60 may be an in-cell polarizer formed directly on the second substrate 12. [

The plurality of second grids 60 may be disposed such that the respective grids are spaced apart from one another in the longitudinal direction and the longitudinal direction of the grids is perpendicular to the transmission axis of the second polarized light to be transmitted, The second polarized light may be transmitted and the first polarized light may not be transmitted through the second absorption reflective polarizer 60.

The description of the plurality of second grids 60 is the same as the description of the first grid in the first absorption reflective polarizer 20 described above and will be described below mainly on the differences.

The plurality of second grids (60) may be disposed such that the longitudinal direction thereof is perpendicular to the longitudinal direction of the first grid (20). In addition, the plurality of second grids 60 may be provided as a laminate in which a single grid is formed of a metal and an insulating material, respectively. The second grid 60 of the second absorptive reflective polarizer included in an embodiment of the present invention may have a structure in which a fourth metal layer, an insulating layer, and a third metal layer are sequentially stacked under the second substrate 12. Here, the fourth metal layer corresponds to the second metal layer 21c of the first grid 21, the third metal layer corresponds to the first metal layer 21a of the first grid 21, Therefore, the absorption function of the first polarized light may depend on the thickness and the refractive index of each of the fourth metal layer and the insulating layer, and the reflectivity of the third metal layer is larger than that of the fourth metal layer in order to further improve the absorption function of the first polarized light . In order to reflect the first polarized light incident on the lower portion of the second absorption reflective polarizer, the third metal layer of the second grid preferably has a large thickness to prevent the first polarized light from being transmitted, It is preferable to use a metal having a small extinction coefficient k and a surface reflectance remarkably high in order to reflect the whole amount.

The thickness of the third metal layer in the second grid included in the preferred embodiment of the present invention may be 20 to 500 nm, the extinction coefficient k is 1.48e + 6 cm ^-1 or less at a wavelength of 500 nm, It is preferable that a metal having a thickness of 85% or more, more preferably 90% or more, still more preferably 95% or more, and even more preferably 99.9% or more is arranged at a thickness of 100 nm with respect to a wavelength of 500 nm.

In addition, the second grid may be a total of four stacked layers in which a metal layer and an insulating layer are alternately stacked as shown in FIG. 9 relating to the first grid described above. In the first grid, a first metal layer 21a, Unlike that formed on the top of the first substrate 11, the second grid is the same as that described in the first grid except that it is formed on the bottom of the second substrate 12. [

The second substrate 12 on which the second absorption reflective polarizer 60 may be formed on one side may be any one of a glass substrate, a quartz substrate, a sapphire substrate, a plastic substrate, and a flexible polymer film that can be bent. More preferably, the second substrate 12 may be transparent. However, the present invention is not limited to the above-described types, and any type of substrate used for a display panel of a liquid crystal display can be used.

The area of the first substrate 11 may be determined according to the area of the display panel, and the thickness of the second substrate 12 may be 100 m to 1 mm, but is not limited thereto.

As described above, the display panel 100 may have a different shape depending on the shape of the liquid crystal display device to be implemented, and is not particularly limited to a shape such as a polygon or a circle. However, And a pair of sides of the two pairs of sides may be formed longer than the other pair of sides, but the present invention is not limited thereto. The size of the display panel 100 may be within a range of manufacturable sizes, and is not particularly limited in the present invention.

The liquid crystal display device according to the present invention includes a backlight unit 200 disposed below the display panel 100 to supply light.

1, the backlight unit 200 includes a light source unit 220 including a light source 221 and a reflective member 210 disposed under the light source unit 220. The backlight unit 200 includes a display panel 100, And may further include an optical member 230 between the light source units 220.

First, the light source unit 220 will be described.

The light source unit 220 may include a light source 221 and a circuit board 222 electrically connecting the light source 221. The light source 221 may be a point light source, a circular light source, a surface light source, or the like, but is not limited thereto. As a non-limiting example, the light source may be a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL) Lamp, EEFL (External Electrode Fluorescent Lamp), and the like can be exemplified. Any light emitter known in the art can be employed without any limitation.

In addition, the light source 221 may mean a light emitter of a minimum unit in which the amount of light emitted individually is adjusted. Accordingly, one light source may include one light emitter (e.g., one LED), but may include a plurality of light emitters whose brightness is simultaneously adjusted. One or a plurality of the light sources 221 may be arranged in a line, a zigzag, a circle, or the like along a predetermined direction on an upper surface of a circuit board 222 electrically connecting the light sources 221.

The circuit board 222 may be a printed circuit board on which wiring for supplying and / or controlling power to the light source 221 is printed, and may also serve as a supporting member for supporting the light source, The metal printed circuit board may be a metal printed circuit board having a metal plate for performing a heat radiating function. The shape of the circuit board 222 may be designed differently according to the arrangement of the light sources, and the size may be designed differently according to the purpose, so that the present invention is not particularly limited thereto.

The light source 221 and the circuit board 222 may be disposed on the upper surface of the circuit board 222 as in the light source unit 210 shown in FIG. But it may vary depending on the design purpose and structure of the specific backlight unit. For example, the backlight unit 1200 shown in FIG. 10, which is one embodiment of the present invention, is disposed on a support part of which one side is bent so that the light source 1221 of the light source part 1220 is disposed on the side of the backlight unit 1200 And a light guide member 1240 disposed on the reflective member 1210 so as to guide the light incident from the light source 1221 and to guide the light toward the display panel 1100. The light guiding member may be a member such as a light guide plate used in a liquid crystal display device provided in a conventional edge type backlight unit, and the present invention is not particularly limited thereto.

Meanwhile, a plurality of light sources 221 of FIG. 1 may be provided. In this case, the plurality of light sources may be arranged in parallel and spaced apart from each other at regular intervals, and each light source may be independently driven, and each of the light sources may be different from each other in shape, And these are not particularly limited in the present invention.

The light source unit 1220 shown in FIG. 11 is disposed only on one side of the backlight unit, but four light source units A ₁ , A ₂ , A ₃ , and A ₄ may be disposed on the side surface of the backlight unit as shown in FIG.

The reflective members 210 and 1210 disposed below the light sources 220 and 1220 will be described. The reflective members 210 and 1210 do not direct the backlight unit in the direction of the display panel out of the light emitted from the light sources 220 and 1220 but return the backward light to the front. In addition, the reflection members 210 and 1210 may reflect the second polarized light (d ₆ , d ₁ ', d ₂ ', d ₃ ') reflected from the first absorption reflective polarizer 20'') Toward the first absorption reflective polarizer 20''in a non-polarized state, thereby contributing to increase the optical recycling efficiency for the second polarized light. Since the reflective member may employ a known reflective member provided in a conventional liquid crystal display device backlight unit, the present invention is not particularly limited to this.

The backlight units 200 and 1200 may further include optical members 230 and 1230 between the display panels 100 and 1100 and the light source unit 220.1220.

The optical members 230 and 1230 may perform functions such as condensing and dispersing light supplied to the display panels 100 and 1100. The optical members 230 and 1230 may include a diffusion sheet 232.1232 and prism sheets 231 and 1231 and each of the sheets may be a sheet commonly used in the art, I never do that. Further, the optical members 230 and 1230 may further include a sheet that performs other functions in addition to the diffusion sheet and the prism sheet, or one or more of the sheets may be omitted. In addition, the optical sheet may have a plurality of sheets of a specific kind, and the stacking sequence of the sheets may also be different according to the purpose, and thus the present invention is not particularly limited thereto.

As described above, the display panels 100 and 1100 and the backlight unit 200.1200 are supported and fixed through the protective members 300 and 1300, and can be implemented as a liquid crystal display device. Intermediate protection members 320 and 1320 of the protective members 300 and 1300 are provided along the edges of the display panels 100 and 1100 to support the display panel at a lower portion of the display panels 100 and 1000. The intermediate protective members 320 and 1320 may include fixing members for fixing or supporting components other than the display panel 100 and 1100 such as the optical members 230 and 1230 of the backlight unit, (Not shown). The intermediate protective members 320 and 1320 may be provided at positions corresponding to four sides of the display panel 100 or 1100, or at positions corresponding to at least a part of the four sides. For example, the intermediate protective members 320 and 1320 may have a quadrangular ring shape corresponding to four sides of the display panels 100 and 1100, or three of the edges of the display panel 100 and 1100 Shape corresponding to the sides. The intermediate protective members 320 and 1320 may be integrally formed as a single unit, but may be formed as a plurality of units as needed. The intermediate protective members 320 and 1320 may be made of an organic material such as a polymer resin, but the present invention is not limited thereto. The intermediate protective members 320 and 1320 may be made of other materials having the same shape and function.

The panel front edge of the display panels 100 and 1100 is supported by the upper protection members 310 and 1310 of the protection members 300 and 1300 and the side edges or the lower protection of the intermediate protection members 320 and 1320 Thereby covering the sides of the members 330 and 1330.

The lower protective members 330 and 1330 may serve to accommodate the backlight unit and may further include a heat radiation member that performs a heat radiation function. It is also possible to further include a reflecting member for reflecting the internal light emitted from the backlight unit on the side surface.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

11: first substrate 12: second substrate
20, 20 ": first absorption reflective polarizer 30, 30 &
40: wavelength selective light transmission reflective layer 50: color conversion layer
60,60 ": second absorption reflective polarizer 100,1100: display panel
200, 1200: backlight unit 300, 1300: protective member

Claims (17)

A backlight unit disposed above the reflecting member and the reflecting member, the backlight unit including a light source that emits light in the first wavelength range;
And a display panel disposed above the backlight unit and emitting light incident from below to display an image,
A first absorption reflective polarizer which absorbs second polarized light incident from above the first polarized light and the second polarized light whose polarization axes are orthogonal to each other, reflects the second polarized light incident from below, and transmits the first polarized light;
A liquid containing a liquid crystal layer;
A wavelength-selective light-transmitting layer that transmits light of the first wavelength band and reflects light of a wavelength longer than the first wavelength band;
A color conversion layer including a fluorescent film which is excited by the light of the first wavelength band and emits light having a longer wavelength than the first wavelength band;
A wavelength-selective light reflection layer that at least partially reflects the second wavelength band light of the emitted long wavelength light, and transmits light of a wavelength different from the second wavelength band; And
And a second absorption reflective polarizer which absorbs the first polarized light incident from above and reflects the first polarized light incident from below and transmits the second polarized light sequentially from the lower side to the upper side of the display panel, .
The method according to claim 1,
Wherein the first wavelength band is included in a blue wavelength region or an ultraviolet wavelength region,
When the first wavelength band is included in the blue wavelength region, the second wavelength band is included in the green wavelength region,
And the second wavelength band is included in the blue wavelength region or the green wavelength region when the first wavelength band is included in the ultraviolet wavelength region.
The method according to claim 1,
The first polarized light of the external light incident on the display panel is absorbed by the second absorption reflective polarizer, the second polarized light of the external light is transmitted through the second absorption reflective polarizer, is incident on the first absorption reflective polarizer, 1 absorbing reflective polarizer.
The method according to claim 1,
The second polarized light of the internal light emitted from the light source is phase-shifted at least partly to the first polarized light through repeated incidence and reflection between the first absorption reflective polarizer and the reflection member, And the brightness is improved through transmission.
The method according to claim 1,
Wherein the first polarized light of the internal light transmitted upward of the liquid crystal unit is reflected by the second absorption reflective polarizer, then incident on and reflected by the reflection member, and transmitted to the upper portion of the first absorption reflective polarizer, Device.
The method according to claim 1,
The light having a wavelength longer than that of the first wavelength band emitted from the color conversion layer and directed downward is incident on the wavelength selective light transmitting layer and then is reflected upward,
A part of the light emitted from the color conversion layer and longer than the first wavelength band toward the upward direction is reflected by the second absorption reflective polarizer, and then reflected from the wavelength-selective light-transmitting layer and the wavelength- And the brightness is improved.
The method according to claim 1,
Wherein a micro cavity for the second wavelength band light is formed between the wavelength-selective light-transmitting layer and the wavelength-selective light-reflecting layer to improve the purity of the second wavelength band light color.
The method according to claim 1,
Wherein the first absorption reflective polarizer comprises a plurality of first grids spaced apart from one another so that the longitudinal direction thereof is perpendicular to the polarization axis of the second polarized light,
And the second absorption reflective polarizer includes a plurality of second grids spaced apart from each other such that the longitudinal direction thereof is perpendicular to the polarization axis of the first polarized light.
9. The method of claim 8,
Wherein the single first grid and the single second grid are each a laminate in which a metal layer and an insulating layer are alternately laminated independently.
10. The method of claim 9,
The laminate includes a first laminate and a first metal layer, a first insulating layer, a second metal layer, and a second insulating layer in which a first metal layer, a first insulating layer, and a second metal layer are laminated on the basis of an upper direction of the display panel And a stacked body of at least one of the stacked second stacked bodies.
10. The method of claim 9,
Wherein the metal layer has a thickness of 30 to 500 nm.
The method according to claim 1,
Wherein the color converting layer includes a blue fluorescent film, a green fluorescent film, and a red fluorescent film when the light of the first wavelength range is included in the wavelength range of the ultraviolet region,
Wherein the color converting layer comprises a green fluorescent film and a red fluorescent film when the light of the first wavelength range is included in the wavelength range of the blue region.
The method according to claim 1,
Wherein the fluorescent film comprises at least one of a phosphor, a quantum dot, and an organic light emitting material.
The method according to claim 1,
Wherein the backlight unit further comprises an optical film on a light path from when the light emitted from the light source enters the display panel.
1. A liquid crystal display panel which emits light of a first wavelength band incident from below a liquid crystal layer to above a liquid crystal layer to display an image,
A lower substrate;
A first absorption reflective polarizer which absorbs second polarized light incident from above the first polarized light and the second polarized light whose polarization axes are orthogonal to each other, reflects the second polarized light incident from below, and transmits the first polarized light;
A liquid containing a liquid crystal layer;
A wavelength-selective light-transmitting layer that transmits light of the first wavelength band and reflects light of a wavelength longer than the first wavelength band;
A color conversion layer including a fluorescent film which is excited by the light of the first wavelength band and emits light having a longer wavelength than the first wavelength band;
A wavelength-selective light reflection layer that at least partially reflects the second wavelength band light of the emitted long wavelength light, and transmits light of a wavelength different from the second wavelength band;
A second absorption reflective polarizer that absorbs the first polarized light incident from above, reflects the first polarized light incident from below, and transmits the second polarized light; And
And an upper substrate are sequentially included in a lower portion of the display panel in an upper direction.
A liquid crystal display device comprising the liquid crystal display panel according to claim 15.
The method according to claim 1,
Wherein a micro cavity for the second wavelength band light is formed between the second absorption reflective polarizer and the wavelength selective reflection layer to improve the purity of the second wavelength band light color.

Images