KR20180046969A - Display device - Google Patents

Abstract

The present invention relates to a display device, including: a display substrate; a counter substrate facing the display substrate; and a liquid crystal layer interposed between the display substrate and the counter substrate. The display substrate includes: a first substrate; a thin film transistor disposed on the first substrate; and a first electrode connected to the thin film transistor. The counter substrate includes: a second substrate; a color conversion layer disposed on the second substrate; a first polarization plate disposed on the color conversion layer; and a second electrode disposed on the first polarization plate. The color conversion layer includes: a color conversion unit; and a buffer layer overlapping the color conversion unit. Accordingly, the present invention can display a screen without mixing a color.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device having a color conversion layer.

2. Description of the Related Art A liquid crystal display (LCD) is one of the most widely used flat panel displays (FPDs), and includes two substrates on which electrodes are formed and a liquid crystal layer interposed therebetween.

A liquid crystal display device is a display device that adjusts the amount of light transmitted by applying voltage to two electrodes to rearrange the liquid crystal molecules of the liquid crystal layer. Such a liquid crystal display device includes a color filter for expressing color.

Recently, a display device in which a color filter used in an existing liquid crystal display device is replaced with a fluorescent pattern has been studied. A display device having such a fluorescent pattern is also referred to as a photo-luminescent display (PLD). The photoluminescent display device includes a polarizing plate disposed between the color conversion layer and the light amount control layer.

An embodiment of the present invention is to provide a display device including a polarizer having a thin and excellent flatness.

According to an aspect of the present invention, there is provided a display device including: a display substrate;

An opposite substrate facing the display substrate; And a liquid crystal layer interposed between the display substrate and the counter substrate, wherein the display substrate comprises: a first substrate; A thin film transistor disposed on the first substrate; And a first electrode connected to the thin film transistor, wherein the counter substrate comprises: a second substrate; A color conversion layer disposed on the second substrate; A first polarizer disposed on the color conversion layer; And a second electrode disposed on the first polarizer plate, wherein the color conversion layer comprises a color conversion unit; And a buffer layer overlapping the color conversion unit.

The color conversion unit includes a red conversion unit; And a green conversion unit; . ≪ / RTI >

The color conversion unit may include a quantum dot.

The color conversion unit may further include a transmission unit.

And further includes a light shielding layer disposed between the red conversion portion and the green conversion portion on a plane

can do.

The light shielding layer may be disposed between the second substrate and the buffer layer.

The light-shielding layer may be disposed between the buffer layer and the first polarizer plate.

And a flat layer disposed between the second electrode and the first polarizer.

The light shielding layer may be disposed between the first polarizer and the flat layer.

And a yellow color filter disposed between the second substrate and the buffer layer.

The yellow color filter can overlap the red conversion portion and the green conversion portion.

The color conversion portion may be disposed between the second substrate and the buffer layer.

The color conversion portion may be disposed between the buffer layer and the first polarizer plate.

And an adhesive layer disposed between the buffer layer and the first polarizing plate.

According to an aspect of the present invention, there is provided a display device including: a display substrate; An opposite substrate facing the display substrate; And a liquid crystal layer interposed between the display substrate and the counter substrate, wherein the display substrate comprises: a first substrate; A thin film transistor disposed on the first substrate; And a first electrode connected to the thin film transistor, wherein the counter substrate comprises: a second substrate; A color conversion layer disposed on the second substrate; A first polarizer disposed on the color conversion layer; And a second electrode disposed on the first polarizing plate, wherein the counter substrate includes a flat layer disposed on at least one of the second substrate and the color conversion layer and between the first polarizing plate and the second electrode.

Since the display device according to an embodiment of the present invention includes a thin polarizer, a screen can be displayed without mixing colors.

Further, according to another embodiment of the present invention, a thin polarizer can be made because a polarizer is formed on the carrier substrate.

1 is an exploded perspective view of a display device according to a first embodiment of the present invention.
2 is a plan view of a pixel of the display device shown in Fig.
3 is a sectional view taken along the line I-I 'of FIG.
FIG. 4A is a perspective view of a first polarizer according to the first embodiment of the present invention, and FIG. 4B is a sectional view taken along II-II 'of FIG. 4A.
5A to 5G are process diagrams of a display device according to the first embodiment of the invention.
6 is a cross-sectional view of a display device according to a second embodiment of the present invention.
7 is a cross-sectional view of a display device according to a third embodiment of the present invention.
8 is a cross-sectional view of a display device according to a fourth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Thus, in some embodiments, well known process steps, well known device structures, and well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. Like parts are designated with like reference numerals throughout the specification. It will be understood that when an element such as a layer, film, region, plate, or the like is referred to as being "on" another portion, it includes not only the element directly over another element, Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. Also, when a portion of a layer, film, region, plate, or the like is referred to as being " below " another portion, it includes not only a case where it is "directly underneath" another portion but also another portion in between. Conversely, when a part is "directly underneath" another part, it means that there is no other part in the middle.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" May be used to readily describe a device or a relationship of components to other devices or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term " below " can include both downward and upward directions. The elements can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

In this specification, when a part is connected to another part, it includes not only a direct connection but also a case where the part is electrically connected with another part in between. Further, when a part includes an element, it does not exclude other elements unless specifically stated to the contrary, it may include other elements.

The terms first, second, third, etc. in this specification may be used to describe various components, but such components are not limited by these terms. The terms are used for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second or third component, and similarly, the second or third component may be alternately named.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to Figs. 1 to 3. Fig.

1 is an exploded perspective view of a display device according to a first embodiment of the present invention.

Referring to FIG. 1, the display device according to the first exemplary embodiment of the present invention includes a backlight unit 410, a second polarizer 520, a display substrate 110, a light amount control layer 310, (210). The counter substrate 210 includes a common electrode CE, a flat layer 535, a first polarizer 510, a color conversion layer 330, and a second substrate 211.

The backlight unit 410 includes a light source 411 and a light guide plate 412. The backlight unit 410 may emit ultraviolet rays, near ultraviolet rays, or the like. The backlight unit 410 may irradiate white light or blue light to the display substrate 110, for example. Hereinafter, the first embodiment will be described with a display device including a backlight unit 410 emitting blue light.

FIG. 2 is a plan view of a pixel of the display device shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line I-I 'of FIG.

2 and 3, the display device 101 according to the first embodiment of the present invention includes a display substrate 110, an opposing substrate 210 opposed to the display substrate 110, and a display substrate 110 And a light amount control layer 310 disposed between the counter substrate 210 and the opposing substrate 210 facing each other.

The light amount control layer 310 may be any material that can control the transmittance of light provided from the backlight portion 410. For example, the light amount control layer 310 may be any one of a liquid crystal layer, an electrowetting layer, and an electrophoresis layer. Hereinafter, the light amount control layer 310 is a liquid crystal layer, for example. In this case, the display device 100 according to the first embodiment of the present invention can be referred to as a liquid crystal display device.

The display substrate 110 includes a first substrate 111, a thin film transistor (TFT), a pixel electrode PE, a gate insulating film 121 and a protective film 131. The thin film transistor TFT includes a semiconductor layer SM, a resistive contact layer 115, a gate electrode GE, a source electrode SE and a drain electrode DE.

The first substrate 111 is made of transparent glass or plastic.

A plurality of gate lines GL and a plurality of gate electrodes GE are disposed on the first substrate 111. The gate electrode GE is formed integrally with the gate line GL. The gate line GL and the gate electrode GE may be formed of a metal such as aluminum or aluminum alloy such as aluminum or silver alloy or a silver metal such as silver or silver alloy or copper such as copper or copper alloy, Based metal or a molybdenum-based metal such as molybdenum (Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta), and titanium (Ti). At least one of the gate line GL and the gate electrode GE may have a multi-film structure including at least two conductive films having different physical properties.

The gate insulating film 121 is disposed on the entire surface of the first substrate 111 including the gate line GL and the gate electrode GE. The gate insulating film 121 may be made of silicon nitride (SiNx), silicon oxide (SiOx) or the like. Alternatively, the gate insulating film 121 may have a multi-film structure including at least two insulating layers having different physical properties.

The semiconductor layer (SM) is disposed on the gate insulating film (121). At this time, the semiconductor layer SM overlaps with the gate electrode GE located under the gate insulating layer 121. The semiconductor layer SM may be made of amorphous silicon or polycrystalline silicon or the like. The semiconductor layer SM may be made of an oxide semiconductor.

The resistive contact layer 115 is disposed on the semiconductor layer SM. For example, the resistive contact layer 115 is disposed on the semiconductor layer SM other than the channel portion of the semiconductor layer SM.

Further, a plurality of data lines DL are arranged on the gate insulating film 121. The data line DL crosses the gate line GL. The source electrode SE is formed integrally with the data line DL. The source electrode SE is disposed on the ohmic contact layer 115. The drain electrode DE is disposed on the ohmic contact layer 115 and is connected to the pixel electrode PE.

At least one of the data line DL, the source electrode SE and the drain electrode DE may be made of a refractory metal such as molybdenum, chromium, tantalum and titanium or an alloy thereof. Alternatively, at least one of the data line DL, the source electrode SE and the drain electrode DE may have a multi-film structure including a refractory metal film and a low-resistance conductive film.

The protective film 131 is disposed on the front surface of the first substrate 111 including the data line DL, the source electrode SE and the drain electrode DE. The protective film 131 may be made of an inorganic insulating material such as silicon nitride (SiNx) or silicon oxide (SiOx). Alternatively, the protective film 131 may be made of an organic film. The protective film 131 may have a bilayer structure of a lower inorganic film and an upper organic film.

The pixel electrode PE is disposed on the protective film 131. [ At this time, the pixel electrode PE is connected to the drain electrode DE through the contact hole CH of the passivation layer 131. The pixel electrode PE may be made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

The second polarizing plate 520 is disposed on the display substrate 101. Specifically, the second polarizing plate 520 may be disposed on the back surface of the first substrate 111.

The counter substrate 210 includes a second substrate 211, a color conversion layer 330, a first polarizer 510, and a flat layer 535. According to the first embodiment of the present invention, the counter substrate 210 further includes a light-shielding layer BM and a common electrode CE.

The second substrate 211 is made of transparent glass or plastic.

The light-shielding layer BM may be disposed on the second substrate 211, as shown in Fig. Specifically, the light shielding layer BM may be disposed between the second substrate 211 and a buffer layer 332 described later. The light-shielding layer BM has a plurality of openings, and the openings are arranged corresponding to the pixel electrodes PE of the first and second pixels PX1 and PX2. A color conversion unit 331 to be described later may be disposed corresponding to each pixel electrode PE. In other words, the light shielding layer BM can be disposed between the plurality of color conversion portions 331 on a plane. Specifically, the light-shielding layer BM may be disposed on the plane between the first color conversion portion 231 and the second color conversion portion 232. [ The light-shielding layer BM blocks light in the portions excluding the openings. For example, the light-shielding layer BM is disposed on the thin film transistors TFT, the gate line GL, and the data line DL to block the light that has passed through them from being emitted to the outside.

The color conversion layer 330 is disposed between the second substrate 211 and the first polarizer 510.

The color conversion layer 330 includes a color conversion section 331. The color conversion unit 331 includes a phosphor that absorbs light having a predetermined wavelength and emits light having a different wavelength. The color conversion units 231 and 232 may be separated from each other by the light shielding layer BM.

On the basis of the second substrate 211, the color conversion portion 331 is disposed on the second substrate 211. The color conversion unit 331 is disposed in the pixels PX1 and PX2. For example, the color conversion unit 331 may be located at the opening of the light-shielding layer BM corresponding to the pixel electrode PE. At this time, the edge of the color conversion portion 331 may be located on the light blocking layer BM.

The color conversion unit 331 converts the wavelength of the light incident from the backlight unit 410 and emits light having a different wavelength.

Specifically, the color conversion unit 331 includes a first color conversion unit 231 and a second color conversion unit 232, respectively. For example, the first color conversion section 231 may correspond to a red pixel, and the second color conversion section 232 may correspond to a green pixel. Although not shown, the color conversion unit 331 may include a third color conversion unit. And the third color conversion unit may correspond to the blue pixel. The first color converting unit 231 may include a red phosphor, the second color converting unit 232 may include a green phosphor, and the third color converting unit may include a blue phosphor.

According to the first embodiment of the present invention, the color conversion unit 331 may be disposed between the second substrate 211 and a buffer layer 332 described later.

Although not shown, the color conversion section 231 may include a transmission section. The wavelength of the light passing through the transmissive portion does not change. For example, when the backlight unit 410 receives blue light onto the display substrate 110, the transmission unit may correspond to a blue pixel.

The color conversion layer 330 includes a buffer layer 332. The buffer layer 332 is disposed on the color conversion section 331 and the light shielding layer BM and overlaps with the color conversion section 331. [ The buffer layer 332 flattens the stepped portion generated by the color conversion portion 331 and the light-shielding layer BM. The buffer layer 332 may be made of a light-transmitting organic material.

The color conversion layer 330 may be made of a resin including a phosphor. A phosphor is a substance that emits fluorescence when irradiated with light or radiation, and emits light having a unique color of the phosphor. Further, the phosphor emits light to the entire region regardless of the direction of the emitted light.

There is a quantum dot as a phosphor contained in the color conversion layer 330. The quantum dot is a wavelength converting particle capable of emitting light having a specific wavelength by converting the wavelength of light incident on the quantum dot. Quantum dots can vary in wavelength depending on their size. For example, by controlling the diameter of the quantum dots, the quantum dots can emit light of a desired color.

Quantum dots have a higher extinction coefficient and higher quantum yield than conventional fluorescent dyes and produce very strong fluorescence. In particular, quantum dots can emit light of shorter wavelengths and emit longer wavelengths of light.

Quantum dots can have a structure that includes core nanocrystals and shell nanocrystals surrounding core nanocrystals. In addition, the quantum dots may include organic ligands bound to the shell nanocrystals, and may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals can be formed in two or more layers. The shell nanocrystals are placed on the surface of the core nanocrystals.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor. More specifically, the core nanocrystals constituting the quantum dot may include at least one of PbSe, InAs, PbS, CdSe, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe and HgS. Further, the shell nanocrystals may include at least one of CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe and HgS.

For example, blue light can be generated when the core nanocrystals include CdSe and the diameter of the quantum dots is 1 nm to 3 nm, and green light can be generated when the diameter of the quantum dots is 3 nm to 5 nm , And red light can be generated when the diameter of the quantum dots is 7 nm to 10 nm.

Quantum dots can be formed by a chemical wet process. The chemical wet process is a method of growing particles by adding a precursor material to an organic solvent.

The color conversion layer 330 may include quantum rod particles instead of quantum dot particles

The first polarizing plate 510 is disposed on the color conversion layer 330 and disposed closer to the liquid crystal layer 310 than the color conversion layer 330 on the basis of the second substrate 211. The transmission axis of the first polarizing plate 510 and the transmission axis of the second polarizing plate 520 are orthogonal, and one of them may be arranged in parallel to the gate line GL.

The flat layer 535 is disposed between the first polarizer 510 and the common electrode CE. The planarizing layer 535 flattens the bottom of the first polarizing plate 510. The planarization layer 535 may be formed of an organic material such as acryl, polyimide, or BCB (Benzocyclobutene).

On the basis of the second substrate 211, the common electrode CE is disposed on the first polarizer 510. Specifically, the common electrode CE is disposed on the planarization layer 535. For example, the common electrode CE may be positioned on the front surface of the second substrate 211 including the first polarizing plate 510. The common electrode CE may be formed of a transparent conductive material such as ITO or IZO.

The common electrode CE applies an electric field to the light amount control layer 310 together with the pixel electrode PE. As a result, an electric field is formed in the liquid crystal layer between the common electrode CE and the pixel electrode PE.

The counter substrate 210 may further include a yellow color filter 235. As shown in FIG. 3, the yellow color filter 235 is disposed between the second substrate 211 and the buffer layer 332. Specifically, the yellow color filter 235 is disposed between the second substrate 211 and the color conversion portion 331. That is, the yellow color filter 235 can overlap the first color conversion section 231 and the second color conversion section 232. The yellow color filter 235 absorbs blue light and transmits red light and green light.

The blue light emitted from the backlight unit 410 is incident on the color conversion layer 330. Of the blue light incident on the first color converter 231, the light converted into the red light is transmitted through the yellow color filter 235 and the blue light not converted to the red light is absorbed by the yellow color filter 235. Of the blue light incident on the second color converter 231, the light converted into green light is transmitted through the yellow color filter 235 and the blue light not converted to green light is absorbed by the yellow color filter 235. As a result, clear red and green are realized in the red and green pixels, respectively, and the display quality of the display device 101 is improved.

The adhesive layer 280 may be disposed between the buffer layer 332 and the first polarizer 510. Specifically, the adhesive layer 280 may be disposed between the first passivation layer 531 and the buffer layer 253 disposed on the first polarizing plate 510. The adhesive layer 280 attaches the second substrate 211 on which the buffer layer 253 is disposed and the first polarizer 510. An optical clear adhesive (OCA) having optical transparency may be used as the adhesive layer 280. [

Although not shown, the counter substrate 210 may further include a dichroic reflective layer. The dichroic reflective layer may be disposed between the buffer layer 332 and the first polarizer 510. Specifically, the dichroic reflective layer may be disposed between the first polarizing plate 510 and the adhesive layer 280. The dichroic reflective layer includes a dichroic filter. The dichromatic reflection filter is a filter that transmits light having a specific wavelength among the incident light and reflects light having other wavelengths.

When the light incident from the backlight unit 410 is blue light, a dichroic reflective layer may be used to transmit blue light and reflect light other than blue light. In this case, the light incident from the backlight unit 410 passes through the dichroic reflective layer. On the other hand, the red light and the green light converted by the color conversion layer 330 are reflected by the dichroic reflective layer. Therefore, this dichroic reflective layer is also referred to as a yellow reflection filter (YRF).

Specifically, since the red light and the green light are reflected by the dichroic reflective layer, light emitted toward the light amount control layer 310 among the red light and green light generated in the color conversion layer 330 is reflected by the dichroic reflective layer toward the second substrate 211 And is output to the outside. As a result, the light efficiency of the display device 101 can be improved.

The dichroic reflective layer includes a plurality of alternately stacked high refractive index layers and a plurality of low refractive index layers. Selective light transmission can be performed in the dichroic reflective layer by a multi-layer interference phenomenon caused by a plurality of high refractive index layers and a plurality of low refractive layers. The low refraction layer may include at least one of MgF2 and SiO2, and the high refraction layer may include at least one of Ag, TiO2, Ti2O3, and Ta2O3, but is not limited thereto. The thickness of each layer can be designed in the range of 1/8 to 1/2 of the wavelength of transmitted light.

The wavelengths of the transmitted light and the reflected light can be adjusted depending on the configuration of each layer included in the dichroic reflective layer.

4A is a perspective view of a first polarizer 510 applied to a display device according to a first embodiment of the present invention, and FIG. 4B is a sectional view taken along line II-II 'of FIG. 4A.

The first polarizing plate 510 includes a base substrate 511 and a polarizer 512 disposed on the base substrate 511.

The base substrate 511 may be made of a material having excellent transparency, heat resistance, chemical resistance, and the like. For example, the base substrate 511 may be made of polyamide, polyimide, polyethylene naphthalate, polyethylene terephthalate Polyacrylate, or polyacrylate.

The polarizer 512 includes a plurality of line patterns 512a arranged side by side on the base substrate 511. [ Each of the line patterns 512a has a linear shape extending in one direction, has a predetermined width, and is spaced apart from each other at predetermined intervals.

The line pattern 512a can be made of metal. A polarizer 512 including a plurality of metal line patterns 512a is also referred to as a wire grid polarizer (WGP). The polarizer 512 according to the first embodiment of the present invention is a wire grid polarizer (WGP).

The line pattern 512a includes at least one of aluminum (Al), gold (Au), silver (Ag), copper (Cu), chromium (Cr), iron (Fe), and nickel can do.

The polarizer 512 may be formed by a method such as an imprint method using a mold, a photolithography method, or the like. However, the first embodiment of the present invention is not limited thereto, and the polarizer 512 may be made of a block copolymer.

Since the polarizer 512 is made of a very thin and uniform line pattern 512a, the polarizer 512 must be disposed on the base substrate 511 having excellent flatness to have excellent polarization efficiency.

According to a first embodiment of the present invention, a polarizer 512 may be made on the carrier substrate 550 (see FIG. 5B). In this case, since the base substrate 511 is supported by the carrier substrate 550, the base substrate 511 can have excellent flatness. Therefore, the polarizing plate 510 according to the first embodiment of the present invention has excellent polarization efficiency.

According to the first embodiment of the present invention, since the base substrate 511 is supported by the carrier substrate 550 in the process of manufacturing the polarizer 512, the polarizer 512 is formed on the base substrate 511 having a small thickness 512 may be formed.

As described above, since the base substrate 511 has a small thickness, the distance between the pixel electrode PE and the color conversion layer 330 is prevented from being distanced. Accordingly, color mixing caused by the distance between the pixel electrode PE and the color conversion layer 330 is prevented. Therefore, the display device 101 according to the first embodiment of the present invention can have excellent display quality.

A first passivation layer 531 is disposed on the polarizer 512. The first passivation layer 531 protects the polarizer 512 and prevents foreign matter from penetrating into the polarizer 512.

Hereinafter, a method of manufacturing the display device 101 according to the first embodiment of the present invention will be described with reference to FIGS. 5A to 5G. FIG. Figs. 5A to 5G show the manufacturing process of the display device 101 according to the first embodiment of the invention.

First, a display substrate 110 is manufactured as shown in FIG. 5A.

The gate electrode GE and the gate line GL are formed on the first substrate 111 and the gate insulating film 121 is disposed thereon.

Next, a semiconductor layer SM is disposed on the gate insulating film 121, and a resistive contact layer 115 is disposed on the semiconductor layer SM.

A data line DL, a source electrode SE, and a drain electrode DE are disposed on the gate insulating film 121.

A protective film 131 is disposed on the entire surface of the first substrate 111 including the data line DL, the source electrode SE and the drain electrode DE. A pixel electrode PE is disposed on the protective film 131. [ The pixel electrode PE is connected to the drain electrode DE through the contact hole CH of the protective film 131. [

Referring to FIG. 5B, a first polarizer 510 is formed on a carrier substrate 550.

In order to form the first polarizing plate 510, a base substrate 511 is first disposed on the carrier substrate 550. The base substrate 511 is a plastic substrate.

For example, after the polymer resin is coated on the carrier substrate 550, the base substrate 511 can be cured.

Alternatively, a base substrate 511 made of a plastic substrate may be disposed on the carrier substrate 550. As the plastic substrate, a transparent substrate containing any one of polyamide, polyimide, polyethylene naphthalate, polyethylene terephthalate and polyacryl can be used. At this time, an adhesive for fixing the base substrate 511 to the carrier substrate 550 may be used.

According to the first embodiment of the present invention, since the base substrate 511 is supported by the carrier substrate 550, the base substrate 511 can have excellent flatness.

Since the base substrate 511 is supported by the carrier substrate 550, the base substrate 511 having a thin thickness can have sufficient strength. Therefore, a base substrate having a thin thickness of 5 to 50 mu m can be used.

 The polarizer 512 is formed on the base substrate 511 having a thin thickness. The polarizer 512 may be made of aluminum (Al), gold (Au), silver (Ag), copper (Cu), chromium (Cr), iron (Fe), or nickel (Ni). For manufacturing the polarizer 512, imprint, photolithography and the like can be applied.

A first passivation layer 531 is formed on the polarizer 512. The first passivation layer 531 protects the polarizer 512 and prevents foreign matter from penetrating into the polarizer 512.

5C, a yellow color filter 235 and a light blocking layer (not shown) are formed on a second substrate 211 in a process in which a light blocking layer BM and a color conversion layer 330 are disposed on a second substrate 211 BM) is disposed on the yellow color filter 235, and then the color conversion portion 331 is arranged on the yellow color filter 235. In other words, the yellow color filter 235 is disposed so as to overlap with the first color conversion section 231 and the second color conversion section 232. Then, a buffer layer 332 is disposed on the light-shielding layer BM and the color conversion portion 331. [

The buffer layer 332 flattens the stepped portion generated by the color conversion portion 331 and the light-shielding layer BM. The buffer layer 332 may be made of a light-transmitting organic material.

The color conversion unit 331 includes a first color conversion unit 231 and a second color conversion unit 232. The first color converting unit 231 and the second color converting unit 232 may be any one of a red converting unit, a green converting unit and a blue converting unit.

Although not shown, the color conversion layer 330 may include a third color conversion portion and may include a transmission portion.

Referring to FIG. 5D, a second substrate 211 on which a buffer layer 332 is disposed is disposed on the first polarizer 510 and the first passivation layer 531. An adhesive layer 280 is disposed between the buffer layer 332 and the first passivation layer 531 so that the second substrate 211 including the buffer layer 332 adheres to the first passivation layer 531. [ An optical clear adhesive (OCA) having optical transparency may be used as the adhesive layer 280. [

Referring to FIG. 5E, the carrier substrate 550 is removed. The carrier substrate 550 is separated from the base substrate 511 of the first polarizing plate 510 and removed.

A laser may be irradiated to separate the carrier substrate 550 from the base substrate 511. The adhesion between the base substrate 511 and the carrier substrate 550 is weakened by the laser irradiation so that the carrier substrate 550 can be separated from the base substrate 511. [ At this time, a step may be formed in the lower portion of the base substrate 511.

Referring to FIG. 5F, a flat layer 535 may be disposed on the base substrate 511 of the first polarizer 510. The planarizing layer 535 planarizes a step formed under the base substrate 511. The planarization layer 535 may be formed of an organic material such as acryl, polyimide, or BCB (Benzocyclobutene).

 A common electrode CE is disposed on the flat layer 535 with reference to the second substrate 211. The common electrode CE can be made by a known method. Thus, the counter substrate 210 is formed.

Referring again to FIG. 3, the counter substrate 210 formed in FIG. 5F is disposed opposite to the display substrate 110, and a liquid crystal layer as the light amount control layer 310 is disposed therebetween. On the other hand, the liquid crystal layer 310 may be disposed on the display substrate 110, and the counter substrate 210 may be disposed thereon.

Next, the second polarizing plate 520 is disposed on the display substrate 110. For example, the second polarizing plate 520 may be disposed on the rear surface of the first substrate 111. As the second polarizing plate 520, for example, a polarizer such as PVA (Polyvinyl Alcohol) may be used.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. The description related to the display device according to the second embodiment of the present invention and the description related to the display device according to the first embodiment of the present invention will be omitted. 6 is a cross-sectional view of a display device according to a second embodiment of the present invention.

According to the second embodiment of the present invention, the light shielding layer BM is disposed between the first polarizing plate 510 and the flat layer 535.

The light-shielding layer BM has a plurality of openings, and the openings are arranged corresponding to the pixel electrodes PE of the first and second pixels PX1 and PX2. The color conversion unit 331 may be disposed corresponding to each pixel electrode PE. In other words, the light shielding layer BM can be disposed between the plurality of color conversion portions 331 on a plane. Specifically, the light-shielding layer BM may be disposed on the plane between the first color conversion portion 231 and the second color conversion portion 232. [ The light-shielding layer BM blocks light in the portions excluding the openings. For example, the light-shielding layer BM is disposed on the thin film transistors TFT, the gate line GL, and the data line DL to block the light that has passed through them from being emitted to the outside.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG. The description related to the display device according to the third embodiment of the present invention and the description related to the display device according to the first and second embodiments of the present invention will be omitted. 7 is a cross-sectional view of a display device according to a third embodiment of the present invention.

According to the third embodiment of the present invention, the light shielding layer BM is disposed between the buffer layer 332 and the first polarizing plate 510. Specifically, as shown in FIG. 7, the light-shielding layer BM is disposed between the adhesive layer 280 and the first passivation layer 531. The light-shielding layer BM has a plurality of openings, and the openings are arranged corresponding to the pixel electrodes PE of the first and second pixels PX1 and PX2. The color conversion unit 331 may be disposed corresponding to each pixel electrode PE. In other words, the light shielding layer BM can be disposed between the plurality of color conversion portions 331 on a plane. Specifically, the light-shielding layer BM may be disposed on the plane between the first color conversion portion 231 and the second color conversion portion 232. [ The light-shielding layer BM blocks light in the portions excluding the openings. For example, the light-shielding layer BM is disposed on the thin film transistors TFT, the gate line GL, and the data line DL to block the light that has passed through them from being emitted to the outside.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. The description of the display device according to the fourth embodiment of the present invention and the description related to the display device according to the first to third embodiments of the present invention will be omitted. 8 is a cross-sectional view of a display device according to a fourth embodiment of the present invention.

The planarizing layer 535 according to the fourth embodiment of the present invention includes a first planarizing layer 535a and a second planarizing layer 535b and the color converting layer 330 includes a first color converting portion 231, A second color conversion unit 232 and a transmission unit (not shown).

The first flat layer 535a is disposed between the first polarizer 510 and the common electrode CE, as shown in Fig. The first flat layer 535a formed on the lower portion of the base substrate 511 flattens a step formed under the base substrate 511. The first flat layer 535a may be formed of an organic material such as acryl, polyimide, or BCB (Benzocyclobutene).

The second flat layer 535b is disposed between the second substrate 211 and the color conversion portion 331. The second flat layer 535b flattens the stepped portion generated by the yellow color filter 235. The second flat layer 535b may be made of a light-transmitting organic material.

The light-shielding layer BM has a plurality of openings, and the openings are arranged corresponding to the pixel electrodes PE of the first and second pixels PX1 and PX2. The color conversion unit 331 may be disposed corresponding to each pixel electrode PE. In other words, the light-shielding layer BM may be disposed between the plurality of color conversion parts 331. [ Specifically, the light-shielding layer BM may be disposed on the plane between the first color conversion portion 231 and the second color conversion portion 232. [ The light-shielding layer BM blocks light in the portions excluding the openings. For example, the light-shielding layer BM is disposed on the thin film transistors TFT, the gate line GL, and the data line DL to block the light that has passed through them from being emitted to the outside.

According to the fourth embodiment of the present invention, the color conversion portion 331 is disposed between the second planarizing layer 535b and the first polarizing plate 510. 8, the first color converting unit 231 and the second color converting unit 232 may be disposed between the second flat layer 535b and the first polarizing plate 510. In this case, At least one of the first color conversion portion 231, the second color conversion portion 232 and the transmissive portion may be disposed between the second substrate 211 and the second flat layer 535b .

The embodiments of the display device described above are merely illustrative, and the scope of protection of the present invention may include various modifications and equivalents to those skilled in the art.

110: display substrate 210: opposing substrate
231: first color converting unit 232: second color converting unit
330: color conversion layer 331:
332: buffer layer 535: flat layer
535a: first flat layer 535b: second flat layer
BM: Shading layer

Claims (15)

A display substrate;
A counter substrate facing the display substrate; And
And a liquid crystal layer interposed between the display substrate and the counter substrate,
Wherein the display substrate
A first substrate;
A thin film transistor disposed on the first substrate; And
And a first electrode connected to the thin film transistor,
The counter substrate,
A second substrate;
A color conversion layer disposed on the second substrate;
A first polarizer disposed on the color converting layer; And
And a second electrode disposed on the first polarizing plate,
The color conversion layer
A color conversion unit; And
And a buffer layer overlapping the color conversion unit. The method according to claim 1,
Wherein the color conversion unit comprises:
A red conversion unit; And
Green conversion part;
. 3. The method of claim 2,
Wherein the color converter includes quantum dots. 3. The method of claim 2,
Wherein the color conversion section further comprises a transmission section. 3. The method of claim 2,
And a light shielding layer disposed on the plane between the red conversion portion and the green conversion portion. 6. The method of claim 5,
And the light shielding layer is disposed between the second substrate and the buffer layer. 6. The method of claim 5,
And the light blocking layer is disposed between the buffer layer and the first polarizer. 6. The method of claim 5,
And a flat layer disposed between the second electrode and the first polarizer. 9. The method of claim 8,
Wherein the light shielding layer is disposed between the first polarizer and the flat layer. 3. The method of claim 2,
And a yellow color filter disposed between the second substrate and the buffer layer. 11. The method of claim 10,
And the yellow color filter overlaps the red conversion unit and the green conversion unit. The method according to claim 1,
And the color conversion unit is disposed between the second substrate and the buffer layer. The method according to claim 1,
And the color conversion unit is disposed between the buffer layer and the first polarizer. The method according to claim 1,
And an adhesive layer disposed between the buffer layer and the first polarizer. A display substrate;
A counter substrate facing the display substrate; And
And a liquid crystal layer interposed between the display substrate and the counter substrate,
Wherein the display substrate
A first substrate;
A thin film transistor disposed on the first substrate; And
And a first electrode connected to the thin film transistor,
The counter substrate,
A second substrate;
A color conversion layer disposed on the second substrate;
A first polarizer disposed on the color converting layer;
And a second electrode disposed on the first polarizing plate,
Wherein the counter substrate includes a flat layer disposed between at least one of the second substrate and the color conversion layer and between the first polarizer and the second electrode.

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