KR20180069520A - Light-shielding pattern, and Display panel and Display device including the same - Google Patents

Abstract

The present invention provides a light blocking pattern having high light blocking property and adhesion. The light blocking pattern comprises: a binder; and a black particle including a core which includes a black sub-particle and a shell which surrounds the core, and dispersed in the binder. A display panel and a display device including the light blocking pattern prevent light leakage, improve display quality and improve durability by increasing the adhesion property.

Description

[0001] The present invention relates to a light-shielding pattern, a display panel including the light-shielding pattern,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a light blocking pattern having high light blocking characteristics, a display panel and a display device including the same.

In view of the information age, the display field has also rapidly developed. In response to this demand, a flat panel display device (FPD) having a thinness, light weight, and low power consumption has been proposed as a liquid crystal display device LCDs and organic light emitting diode (OLED) display devices have been developed and widely used.

Among such flat panel display devices, a liquid crystal display device (LCD), which is advantageous for moving picture display and has a large contrast ratio and is actively used in TVs and monitors, exhibits optical anisotropy The image is displayed by polarization.

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal layer is formed between two opposing substrates as an essential component and changes the arrangement direction of the liquid crystal molecules in an electric field in the liquid crystal panel, .

Since a liquid crystal panel does not have its own light emitting element, a separate light source is required to display a difference in transmittance by an image. To this end, a backlight unit including a light source is disposed on the back surface of the liquid crystal panel.

On the other hand, there is a problem that the display quality of the liquid crystal display device deteriorates due to light leakage on the side of the liquid crystal panel.

In order to prevent this, a light blocking pattern for preventing light leakage is formed on the side surface of the liquid crystal panel.

1, which is a schematic cross-sectional view of a conventional liquid crystal panel, a liquid crystal panel 1 includes first and second substrates 10 and 20 facing each other and first and second substrates 10 and 20, A seal pattern 40 formed on edges of the first and second substrates 10 and 20 and a seal pattern 40 formed on the edges of the first and second substrates 10 and 20 and the seal pattern 40. [ (50) covering the side surface of the light shielding film (40).

Though not shown, a thin film transistor as a switching element and a pixel electrode connected to the thin film transistor are formed on the first substrate 10, and a color filter layer may be formed on the second substrate 20. In addition, a common electrode is formed on any one of the first and second substrates 10 and 20.

Liquid crystal molecules (not shown) in the liquid crystal layer 30 are driven by an electric field formed between the pixel electrode and the common electrode.

The seal pattern 40 is formed to prevent leakage of the liquid crystal layer 30.

The light blocking pattern 50 is formed on the side surface of the liquid crystal panel 1 to protect the side surface of the liquid crystal panel 1 and to prevent the light leakage problem through the side surface of the liquid crystal panel 1. For example, the light blocking pattern 50 may include black particles such as titanium black or carbon black.

The light blocking pattern 50 is formed by coating an adhesive composition containing black particles and then curing by irradiating UV light.

However, in the light shielding pattern 50, the UV curing degree and the light shielding property (i.e., black OD) have a trade-off relationship. That is, when the light shielding property of the light shielding pattern 50 is high, the UV is blocked and the UV hardening degree is lowered. On the contrary, when the light blocking pattern 50 has high UV transmittance and the UV curing degree is increased, the light blocking characteristic of the light blocking pattern 50 is deteriorated.

An object of the present invention is to provide a light shielding pattern having both a light shielding property and an adhesive property.

To this end, the present invention provides a light intercepting pattern comprising a binder, a core comprising black sub-particles, and a shell surrounding the core and including black particles dispersed in the binder.

Further, the present invention provides a display panel and a display device including the light blocking pattern.

In the present invention, since the color fading particles including a core including a color changing dye and a color-change inducing agent and a shell surrounding the core are discolored by heat to form black particles, Has a high black OD and a high degree of curing.

Therefore, the light-shielding problem is solved by the light blocking pattern and the durability is improved by the high adhesive force.

Such a light blocking pattern is used as a side sealing pattern covering the side surface of the display panel to prevent light leakage on the side of the display panel. Further, the light shielding pattern is used as an adhesive pattern of a display device, thereby preventing light leakage and enhancing the durability of the display device.

Further, since the light blocking pattern has a high black OD, there is an effect that the non-display area of the display panel / display device is minimized and the thickness of the display device is reduced.

1 is a schematic cross-sectional view of a conventional liquid crystal panel.
2 is a schematic view for explaining a display panel according to the first embodiment of the present invention.
3 is a schematic cross-sectional view showing one pixel region of a liquid crystal cell.
4A to 4C are schematic cross-sectional views for explaining a step of forming a light blocking pattern.
5 is a diagram for explaining the discoloration of the discolored particles in the composition for light-shielding pattern of the present invention.
6 is a schematic exploded perspective view of a display device according to a second embodiment of the present invention.
7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.
8 is a schematic view of a display device according to a third embodiment of the present invention.
9 is a schematic cross-sectional view for explaining a display panel of a display device according to a third embodiment of the present invention.
10 is a graph showing the black OD characteristics of the light blocking pattern of the present invention.
11 is a graph showing the adhesive force of the light blocking pattern of the present invention.

The present invention provides a light intercepting pattern comprising a binder, a core comprising black sub-particles, and a shell surrounding the core and including black particles dispersed in the binder.

In the light-shielding pattern of the present invention, the black sub-particle is formed of a substance produced by the reaction of an aminophlorine compound and an aliphatic alcohol.

In the light blocking pattern of the present invention, each of the aminophloran compound and the aliphatic alcohol is represented by the following general formulas (1) and (2), R ₁ and R ₂ in the following general formula (1) are each hydrogen or alkyl, Is an integer of 10 to 40.

[Chemical Formula 1]

(2)

In the light shielding pattern of the present invention, the black sub-particles are represented by the following general formula (3), R ₁ and R ₂ are each hydrogen or alkyl, and n is an integer of 10 to 40.

(3)

In the light intercepting pattern of the present invention, the discoloration sub-particle comprises an open aminophosphorus moiety and an aliphatic alkyl moiety bonded thereto.

In the light shielding pattern of the present invention, the shell is transparent.

In the light shielding pattern of the present invention, the shell may include any one of polyamide, polyether, polyurea, polymethylene, and polyethylene.

In another aspect, the present invention provides a display panel including a liquid crystal cell and the above-described light blocking pattern covering the side surface of the liquid crystal cell.

In another aspect, the present invention provides a display device including a display panel, a case for supporting the edge of the display panel, and the light blocking pattern positioned between the case and the display panel.

In the display device of the present invention, the display panel and the case are bonded by the light blocking pattern.

According to another aspect of the present invention, there is provided a display device comprising: a display panel; a case covering a rear surface and a side surface of the display panel; a cover window covering a front surface of the display panel; A display device including a pattern is provided.

In the display device of the present invention, the case and the cover window are bonded by the light blocking pattern.

Hereinafter, an adhesive and a display device of the present invention will be described with reference to the accompanying drawings.

2 is a schematic view for explaining a display panel according to the first embodiment of the present invention.

2, the display panel 100 according to the first embodiment of the present invention includes first and second substrates 120 and 125 facing each other, and first and second substrates 120 and 125 A liquid crystal cell 110 including first and second polarizers 152 and 154 located on the outer sides of the liquid crystal cell 110 and black particles 140, 130). The first and second polarizing plates 152 and 154 may have mutually perpendicular transmission axes.

Referring to FIG. 3, which is a schematic cross-sectional view showing one pixel region of a liquid crystal cell, a liquid crystal cell 110 includes first and second substrates 120 and 125 facing each other, And 125, and includes a liquid crystal layer 260 including liquid crystal molecules 262.

Each of the first and second substrates 120 and 125 may be a glass substrate or a flexible plastic substrate. For example, each of the first and second substrates 120 and 125 may be a polyimide (PI) substrate.

A first buffer layer 220 is formed on the first substrate 120 and a thin film transistor Tr is formed on the first buffer layer 220. The first buffer layer 220 may be omitted.

A gate electrode 222 is formed on the first buffer layer 220 and a gate insulating layer 224 is formed to cover the gate electrode 222. A gate wiring (not shown) connected to the gate electrode 222 is formed on the buffer layer 220.

A semiconductor layer 226 is formed on the gate insulating layer 224 in correspondence with the gate electrode 222. The semiconductor layer 226 may be made of an oxide semiconductor material. Meanwhile, the semiconductor layer 226 may include an active layer made of amorphous silicon and an ohmic contact layer made of impurity amorphous silicon.

A source electrode 231 and a drain electrode 232 which are spaced apart from each other are formed on the semiconductor layer 226. A data line (not shown) connected to the source electrode 231 intersects the gate line to define a pixel region.

The gate electrode 222, the semiconductor layer 226, the source electrode 231 and the drain electrode 232 constitute a thin film transistor Tr.

A protective layer 234 having a drain contact hole 236 exposing the drain electrode 232 is formed on the thin film transistor Tr.

A pixel electrode 240 connected to the drain electrode 232 through the drain contact hole 236 and a common electrode 242 alternately arranged with the pixel electrode 240 are formed on the passivation layer 234, .

A second buffer layer 252 is formed on the second substrate 125 and a black matrix 254 covering the non-display region such as the thin film transistor Tr, the gate line, and the data line is formed on the second buffer layer 252 Is formed. Further, a color filter layer 256 is formed corresponding to the pixel region. The second buffer layer 252 and the black matrix 254 may be omitted.

The first and second substrates 120 and 125 are attached to each other with the liquid crystal layer 260 interposed therebetween and the liquid crystal layer 260 is formed by an electric field generated between the pixel electrode 240 and the common electrode 242. [ ) Are driven. The common electrode 242 may be formed on the second substrate 125.

Although not shown, an orientation film may be formed on each of the first and second substrates 120 and 125 in contact with the liquid crystal layer 260. An edge of the first and second substrates 120 and 125 A seal pattern for preventing leakage of the liquid crystal layer 260 may be formed.

The light blocking pattern 130 covers the side surface of the liquid crystal cell 110 and includes black particles 140 to prevent light leakage from the liquid crystal cell 110 side. That is, the light shielding pattern 130 is used as a side sealing pattern in the display panel.

The light shielding pattern 130 has a high degree of curing and a high black OD value, minimizing the light leakage problem in the display panel 100 and improving the durability of the display panel 100.

4A to 4C are schematic cross-sectional views for explaining a step of forming a light blocking pattern.

4A, a light blocking pattern material layer 190 is formed on the base 180 by coating a composition for a light blocking pattern including a UV curable material, a photo initiator, and a discoloration particle 160. For example, the base 180 may be a side surface of the liquid crystal cell 110.

The coloring particles 160 include a shell 162 and a core 164 inside the shell 162. The core 164 includes a coloring dye 166 and a color changing dye 166 5, 168, color-change inducing agent).

Next, as shown in FIG. 4B, the light blocking pattern material layer 190 is irradiated with UV to cure the light blocking pattern material layer 190. Thus, the discolored particles 160 are dispersed in a binder (not shown).

At this time, since the coloring particles 160 are in a transparent state, UV is irradiated to the bottom surface of the light blocking pattern material layer 162, and the light blocking pattern material layer 190 has a high degree of curing. Therefore, the base 180 and the light blocking pattern material layer 190 have high adhesion.

Next, as shown in FIG. 4C, a heating process is performed on the light blocking pattern material layer 190 to discolor the discolored particles (160 in FIG. 4B) to form the black particles 140 A light shielding pattern 130 is formed. The heating process may be conducted at a temperature ranging from about 50 to 90 ° C.

Such a temperature range is a general aging process temperature of the display panel 100, and the display panel 100 is not damaged by the heating process.

5, which is a drawing for explaining the discoloration of the discolored particles in the composition for a light-shielding pattern of the present invention, a core 164 including a discoloring dye 166 and a discoloration inducing agent 168, The color fading particles 160 including the surrounding shell 162 have a transparent state. When the heating process is performed on the discolored particles 160, the discoloration dye 166 and the discoloration inducing agent 168 are combined to form black sub-particles 170 in the core 164 to form black sub- The core 164 including the core 164 and the shell 162 surrounding the core 164 are formed.

The discoloration of the discolored particles 160 due to the reaction between the discoloring dye 166 and the discoloration inducing agent 168 is irreversibly caused by heating.

Meanwhile, after the black sub-particles 170 are formed, the shell 162 remains transparent.

The UV curing material may be an acrylate-based material, a silicon-based material, or an epoxy-based material. Further, the composition for light-shielding pattern further comprises a urethane-based material, and moisture curing may proceed after the UV curing process. In addition, the composition for light-shielding pattern may further include a catalyst for improving the reaction rate.

For example, the acrylate-based material may be any one of N-acryloyl morpholine, isobornyl acrylate, 2-phenoxyethyl acrylate, and tetraethyleneglycol diacrylate, and the urethane-based material may be any one of diphenylmethane diisocyanate and urethane prepolymer.

Also, the photoinitiator may be phenylbis (2,4,6-trimethylbenzoyl-phospine oxide), and the catalyst may be diethanol amine or dibutyltin dilaurate (DBTL).

The discoloration dye 166 may be an aminofluorane-based compound. For example, the discoloration dye 166 may be a material of the following formula (1).

[Chemical Formula 1]

In Formula 1, each of R ₁ and R ₂ may independently be hydrogen or alkyl. For example, each of R ₁ and R ₂ may be any one of methyl and ethyl. The color is determined after discoloration according to R ₁ and R ₂ .

The color change inducing agent 168 may be an aliphatic alcohol. For example, the discoloration inducing agent 168 may be a substance of the following formula (2).

(2)

In Formula 2, n may be an integer of 10 to 40. The reaction temperature of the discoloration dye 166 and the discoloration inducing agent 168 may be controlled according to the discoloration inducing agent 168.

It is preferable that the color change inducing agent 168 is a C16-C30 aliphatic alcohol (n = 14-28). In this case, in the aging step of the display panel 100, the coloring dye 166 and the coloring- Reactions can occur.

For example, when the discoloration dye 168 is cetyl alcohol (n = 14), the reaction temperature of the discoloration dye 166 and the discoloration indexer 168 may be about 50 ° C, The reaction temperature may be about 60 ° C. When the decoloring agent 168 is behenyl alcohol (n = 20), the reaction temperature may be about 70-75 ° C. The reaction temperature may be about 80 ° C. when the discoloration inducing agent 168 is lignoceryl alcohol (n = 22). When the discoloration inducing agent 168 is myricyl alcohol (n = 28) Lt; / RTI >

In addition, the shell 162 is made of a transparent polymer having excellent heat resistance. For example, the shell 162 may be any one of polyamide, polyether, polyurea, polymethylene, and polyethylene, but is not limited thereto. That is, the shell 162 is present even after the heating process for discoloring the color fading particles 164, and the black sub-particle 170 is wrapped inside the shell 162.

As described above, the discoloration dye 166 and the discoloration inducing agent 168 react with each other by heat to generate the black sub-particles 170. The carbon-oxygen bond of the pentagonal ring is opened in the fluorene structure of the discoloring dye 166 and bonded to the aliphatic alcohol. Accordingly, the black sub-particle 170 includes an opened aminophosphorus moiety and an alkyl moiety bonded thereto, and may be represented by the following formula (3).

(3)

In other words, the black sub-particle 170 is formed by reacting an aminophloran compound with a C14-C30 aliphatic alcohol, and is located within the shell 162 to form the black particle 140. [

In the discoloration particles 160, the discoloration dye 166 may have an amount of about 100 to 600 parts by weight with respect to the discoloration inducing agent 168, and the shell 162 may have about 30 to 300 parts by weight.

In addition, the color fading particles 160 may be about 5 to 20% by weight, preferably about 10 to 20% by weight, in the light blocking pattern composition. When the weight ratio of the discoloration particles 160 is less than 5 wt%, the black OD of the light blocking pattern 130 is lowered. When the weight ratio of the discoloration particles 160 is more than 20 wt%, the viscosity of the composition for a light blocking pattern is increased The coating properties may be deteriorated.

In the case of using black particles such as titanium black as in the conventional display device, the UV curability is reduced when the amount of black particles is relatively large. Therefore, the black particles must have a content (for example, a weight ratio) below a certain range, and the thickness of the light blocking pattern must be increased to increase the light blocking property (black OD).

However, in the present invention, since the discolored particles 160 are in a transparent state in the UV irradiation process, the UV curability does not decrease even if the content of the discolored particles 160 increases in the light-shielding pattern composition. Therefore, even if the thickness of the light blocking pattern 130 is reduced, it can have a high light shielding characteristic (black OD). Further, since UV is irradiated in a transparent state, the UV curing degree of the light shielding pattern 130 is increased, and the adhesive force is improved.

That is, in the display panel 110 in which the light shielding pattern 130 of the present invention covers the side surface of the liquid crystal cell 110, the adhesion of the light shielding pattern 130 is improved and the black OD value is increased, Is prevented and the durability of the display panel 110 is improved.

FIG. 6 is a schematic exploded perspective view of a display device according to a second embodiment of the present invention, and FIG. 7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention, Fig.

6 and 7, the display device 300 according to the second embodiment of the present invention includes a liquid crystal cell 320, a backlight unit 330, a main frame 340, A bottom frame 350 and a light intercepting pattern 360. That is, the display device 300 of the present invention may be a liquid crystal display device.

The liquid crystal cell 320 displaying an image includes first and second substrates 322 and 324 which are bonded to each other with a liquid crystal layer (not shown) interposed therebetween. First and second polarizers 326 and 328 may be formed on the outer surfaces of the first and second substrates 322 and 324, respectively. The first and second polarizing plates 326 and 328 may have polarization axes (transmission axes) perpendicular to each other.

Although not shown, on the inner surface of the first substrate 122 called a lower substrate or an array substrate, there are formed a plurality of gate wirings and a plurality of data wirings which intersect each other to define pixels, a plurality of gate wirings, A thin film transistor (TFT) connected to the data line, and a pixel electrode connected to the thin film transistor may be formed.

On the inner surface of the second substrate 324, which is called an upper substrate or a color filter substrate, a black matrix for covering non-display elements such as gate wirings, data wirings and thin film transistors, and a black matrix Green, and blue color filters may be formed.

A common electrode is formed on the first substrate 322 or the second substrate 324 to form an electric field with the pixel electrode.

A gate printed circuit board and a data printed circuit board 327 are connected to each other via a connection member 356 such as a flexible circuit board along at least one edge of the liquid crystal cell 320, Or may be brought into close contact with the back surface of the bottom frame 350.

Although not shown, an alignment film for determining the initial alignment direction of the liquid crystal is formed at the boundary between the first and second substrates 322 and 324 of the liquid crystal cell 320 and the liquid crystal layer, A seal pattern may be formed along the edges of the first and second substrates 322 and 324 to prevent leakage of the layer.

A backlight unit 330 for supplying light is disposed on the back surface of the liquid crystal cell 320 so that a difference in transmittance represented by the liquid crystal cell 320 is externally expressed.

The backlight unit 330 includes a light source 338 arranged along the longitudinal direction of at least one edge of the main frame 340, a white or silver reflective plate 336, A light guide plate 334 and an optical sheet 332 disposed on the light guide plate 334. [

The light source 338 is positioned at one side of the light guide plate 334 so as to face the light entrance surface of the light guide plate 334. For example, the light source 338 may include a plurality of light emitting diodes 338a and a printed circuit board 338b having a plurality of light emitting diodes 338a spaced apart from each other.

The reflection plate 336 is disposed on the back surface of the light guide plate 334 and reflects light passing through the back surface of the light guide plate 334 toward the liquid crystal cell 320 to improve the brightness of light.

The optical sheet 332 on the light guide plate 334 includes a diffusion sheet and at least one light collecting sheet and diffuses or condenses light passing through the light guide plate 334 to form a more uniform The surface light source is made incident.

The liquid crystal cell 320 and the backlight unit 330 are modularized through the main frame 340, the bottom frame 350, and the light interception pattern 360.

The bottom frame 350 on which the backlight unit 330 is mounted includes a horizontal surface on which the entire display device 300 is assembled and an edge portion of which the edge of the display device 300 is vertically bent.

The main frame 340 includes a side wall portion 340a surrounding the side surface of the backlight unit 330 such as the side surface of the light guide plate 334 and the back surface of the printed circuit board 338b, And a support portion 40b disposed on the top surface of the backlight unit 330 such as the light guide plate 334 and is coupled to the bottom frame 350. [

The main frame 340 may also be referred to as a support main, guide panel or main support, or a mold frame, and the bottom frame 350 may be referred to as a cover bottom, a bottom cover, or a bottom cover.

Here, the display device 300 includes a display area DA substantially used for image display and a non-display area NDA surrounding the display area DA, which is a non-display area called a bezel area The region NDA may be defined as a region where the light of the backlight unit 330 can not be supplied to the liquid crystal cell 320 by the support portion 340b of the main frame 340. [

The liquid crystal cell 320 is fixed to the support portion 340b of the main frame 340 and is supported at an edge of the liquid crystal cell 320. The liquid crystal cell 320 is supported by the supporting portion 340b of the main frame 340, The liquid crystal cell 320 and the main frame 340 are attached by the pattern 360 and the light leakage is blocked. That is, the light blocking pattern 360 acts as an adhesive.

The light blocking pattern 360 may be formed by applying a composition for a light blocking pattern to the support portion 340b by a dispensing method or a nozzle jetting method and UV curing and then performing a heating process .

For example, since the light blocking pattern 360 can be formed with a width w of about 2.0 mm or less, the non-display area NDA can be reduced to a width of about 5.0 mm or less, a narrow bezel display device 300 can be manufactured.

In addition, since the light blocking pattern 360 can be formed with a thickness t of about 1.0 mm or less, slimming of the display device 300 can be achieved.

5, the light intercepting pattern 360 includes the discoloring particles 160 including the discoloring dye 166 and the discoloration inducing agent 168 and composed of the core 164 positioned in the shell 162, And then cured by irradiation with UV light. Thereafter, the discoloring dye 166 in the core 164 and the discoloration inducing agent 168 react with each other to generate black sub-particles 170 by the heating process, ).

As described above, the light blocking pattern 360 used in the display device 300 of the present invention is formed by coating a light blocking pattern composition containing transparent color fading particles 160, And has excellent adhesion. Further, the heating process is performed after the UV irradiation process, the color fading particles 160 change into black particles 140, and the black OD (light shielding property) of the light blocking pattern 130 is improved.

Therefore, display quality and durability of the display device 300 can be improved.

6 and 7, it is described that the liquid crystal cell 320 and the main frame 340 are attached / fixed via the light intercepting pattern 360. However, And may be attached / fixed to the frame 350. That is, the light blocking pattern 360 may be used when the liquid crystal cell 320 is attached / fixed to the case surrounding the back surface or the supporting means for supporting the liquid crystal cell 320.

In addition, a light blocking pattern (130 in FIG. 2) covering the side surface of the liquid crystal cell 320 may be further formed.

8 is a schematic view of a display device according to a third embodiment of the present invention.

8, the display device 400 according to the third embodiment of the present invention includes a display panel 401, a cover window 470 covering the front surface of the display panel 401, A support frame 480 covering the back and side surfaces of the display panel 401 and supporting the cover window 470 and a light blocking pattern 490 located between the support frame 480 and the cover window 470 ).

9, which is a schematic cross-sectional view illustrating a display panel of a display device according to a third embodiment of the present invention, a display panel 401 includes a substrate 410, a thin film A transistor Tr and a light emitting diode D disposed on the substrate 410 and connected to the thin film transistor Tr. That is, the display panel 401 according to the third embodiment of the present invention is a light emitting diode panel, and the display device 400 is a light emitting diode display device. Alternatively, the display panel 401 may be a liquid crystal panel.

More specifically, a buffer layer 420 is formed on the substrate 410, and a thin film transistor Tr is formed on the buffer layer 420. The buffer layer 420 may be omitted.

A semiconductor layer 422 is formed on the buffer layer 420. The semiconductor layer 422 may be made of an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 422 is made of an oxide semiconductor material, a light shielding pattern (not shown) may be formed under the semiconductor layer 422, and the light shielding pattern may prevent the light from being incident on the semiconductor layer 422 Thereby preventing the semiconductor layer 422 from being deteriorated by light. Alternatively, the semiconductor layer 422 may be made of polycrystalline silicon. In this case, impurities may be doped on both edges of the semiconductor layer 422.

A gate insulating layer 424 made of an insulating material is formed on the semiconductor layer 422. The gate insulating film 424 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 430 made of a conductive material such as metal is formed on the gate insulating layer 424 to correspond to the center of the semiconductor layer 422.

Although the gate insulating film 424 is formed on the entire surface of the substrate 410 in FIG. 9, the gate insulating film 424 may be patterned in the same shape as the gate electrode 430.

An interlayer insulating layer 432 made of an insulating material is formed on the gate electrode 430. The interlayer insulating film 432 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or an organic insulating material such as benzocyclobutene or photo-acryl.

The interlayer insulating film 432 has first and second contact holes 434 and 436 that expose both sides of the semiconductor layer 422. The first and second contact holes 434 and 436 are spaced apart from the gate electrode 430 on both sides of the gate electrode 430.

Here, the first and second contact holes 434 and 436 are also formed in the gate insulating film 424. Alternatively, when the gate insulating film 424 is patterned in the same shape as the gate electrode 430, the first and second contact holes 434 and 436 may be formed only in the interlayer insulating film 432.

A source electrode 440 and a drain electrode 442 made of a conductive material such as metal are formed on the interlayer insulating layer 432.

The source electrode 440 and the drain electrode 442 are spaced apart from each other around the gate electrode 430 and are electrically connected to both sides of the semiconductor layer 422 through the first and second contact holes 434 and 436, / RTI >

The semiconductor layer 422 and the gate electrode 430, the source electrode 440 and the drain electrode 442 constitute the thin film transistor Tr and the thin film transistor Tr includes a driving element ).

The thin film transistor Tr has a coplanar structure in which the gate electrode 430, the source electrode 442, and the drain electrode 444 are positioned above the semiconductor layer 420.

Alternatively, the thin film transistor Tr may have an inverted staggered structure in which a gate electrode is positioned below the semiconductor layer and a source electrode and a drain electrode are located above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.

Although not shown, a gate line and a data line cross each other to define a pixel region, and a switching element connected to the gate line and the data line is further formed. The switching element is connected to the thin film transistor Tr which is a driving element.

In addition, a storage capacitor is formed for keeping the voltage of the gate electrode of the thin film transistor (Tr), which is a driving element, constant during one frame, the power wiring being formed in parallel with the data wiring or the data wiring Lt; / RTI >

A protective layer 450 having a drain contact hole 452 exposing the drain electrode 442 of the thin film transistor Tr is formed to cover the thin film transistor Tr.

A first electrode 460 connected to the drain electrode 442 of the thin film transistor Tr through the drain contact hole 452 is formed on the passivation layer 450 separately for each pixel region. The first electrode 460 may be an anode and may be formed of a conductive material having a relatively large work function value. For example, the first electrode 460 may be made of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) .

A bank layer 466 covering the edge of the first electrode 460 is formed on the passivation layer 450. The bank layer 466 exposes the center of the first electrode 460 corresponding to the pixel region.

A light emitting layer 462 is formed on the first electrode 460. The light emitting layer 462 may have a single layer structure of a light emitting material layer made of a light emitting material. The light emitting layer 462 may include a hole injection layer, a hole transporting layer, a light emitting material layer, and an electron transporting layer sequentially stacked on the first electrode 460 an electron transporting layer, and an electron injection layer.

The light emitting material layer may include an inorganic light emitting material such as a quantum dot or an organic light emitting material.

A second electrode 464 is formed on the plastic substrate 410 on which the light emitting layer 462 is formed. The second electrode 464 is disposed on the entire surface of the display region and is made of a conductive material having a relatively small work function value and can be used as a cathode. For example, the second electrode 464 may be formed of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (AlMg).

The first electrode 460, the light emitting layer 462, and the second electrode 464 form a light emitting diode (D).

Although not shown, an encapsulation film may be formed on the second electrode 464 in order to prevent external moisture from penetrating into the light emitting diode D. The encapsulation film may have a laminated structure of a first inorganic insulating layer, an organic insulating layer and a second inorganic insulating layer, but is not limited thereto. In addition, a polarizing plate (not shown) may be attached on the encapsulation film to reduce external light reflection. For example, the polarizer may be a circular polarizer.

Referring again to FIG. 8, the cover window 470 is located on the front surface of the display panel 401, that is, the display surface, and protects the display panel 401. For example, the cover window 401 may be made of tempered glass. Alternatively, the cover window 401 may be made of high hardness plastic.

The support frame 480 covers the back and sides of the display panel 401 and supports the cover window 470.

The light blocking pattern 490 is positioned between the support frame 480 and the cover window 470 and prevents light leakage through the side edges of the display device 400. In addition, the support frame 480 and the cover window 470 are attached by the light shielding pattern 490.

The light blocking pattern 490 can be formed by applying a composition for a light blocking pattern onto the support frame 480 by a dispensing method or a nozzle jetting method, have.

5, the light intercepting pattern 490 includes the discoloring particles 160 composed of the core 164 including the discoloring dye 166 and the discoloration inducing agent 168 and located in the shell 162, And then cured by irradiation with UV light. Thereafter, the discoloring dye 166 in the core 164 and the discoloration inducing agent 168 react with each other to generate black sub-particles 170 by the heating process, so that the light blocking pattern 490 is black particles 140 ).

As described above, the light-shielding pattern 490 used in the display device 400 of the present invention is formed by coating a light-shielding pattern composition containing transparent discolored particles 160 and then sufficiently cured by UV irradiation And has excellent adhesion. Further, the heating process is performed after the UV irradiation process, so that the discolored particles 160 change into black particles 140 and the black OD (light shielding property) of the light blocking pattern 490 is improved.

Therefore, the display quality and durability of the display device 400 can be improved.

(Black OD) of a light shielding pattern using an adhesive resin containing an acrylic compound, a urethane compound, a photoinitiator and a catalyst was measured and shown in Table 1 below and shown in FIG.

In Comparative Example 1 (Ref1), titanium black particles were added to the adhesive resin (5 wt%). In Comparative Example 2 (Ref2), discoloration dyes of aminophloran and alcohols were added without a shell (10 wt%), In Experimental Example (Ex), discoloration dyes of aminophloran and discoloration particles in which a discoloration inducing agent of an aliphatic alcohol is surrounded by a shell were added. (10 wt%)

[Table 1]

First, in Comparative Example 1, when the content of the titanium black particles as the inorganic particles is larger than 5 wt%, there arises a serious problem in the coating process of the composition, and the UV curing rate is greatly reduced and the adhesive force is very low. Therefore, the content of the titanium black particles is inevitably smaller than that of the discolored particles.

3-diethylamino-6-methyl-aminofluorane is used as the discoloration dye, stearyl alcohol of the following formula (5) is used, and the discoloring dye by the heating process and the aliphatic alcohol The black sub-particles shown in Formula 6 can be produced.

[Chemical Formula 4]

[Chemical Formula 5]

[Chemical Formula 6]

As shown in Table 1 and FIG. 10, in the experimental example using the discoloration dye of aminofluorane and the discoloration particle in which the discoloration inducer of the aliphatic alcohol was wrapped by the shell, a higher black OD do.

In the case of Comparative Example 1, since the content of the titanium black particles should be small in consideration of the adhesive force and the coating property, the light blocking pattern has a low black OD.

On the other hand, in Comparative Example 2, the discoloration dye and the discoloration inducing agent are used but dispersed in the adhesive resin without a shell, so that a discoloration inducing agent (aliphatic alcohol) reacts with the adhesive resin (urethane compound) Particularly, since the discoloration inducing agent reacts with the adhesive resin before the discoloration dye and the discoloration inducing agent are reacted by the heating process, the black OD of the light blocking pattern of Comparative Example 2 is significantly lowered.

In the present invention, however, the reaction between the discoloration dye 166 and the adhesive resin is prevented because the UV curing process proceeds with the discoloring dye 166 and the discoloration inducing agent 168 being protected by the shell 162. Thereafter, the discoloration dye 166 and the discoloration inducing agent 168 react with each other in the shell 162 to generate black sub-particles 170, so that the light blocking pattern 130 of the present invention has a high black OD Can be implemented.

The adhesive force of the light blocking pattern of Comparative Example 1, Comparative Example 2 and Experimental Example was measured, and is shown in Table 2 and shown in Fig.

[Table 2]

As shown in Table 2 and Fig. 11, the light-shielding pattern of Experimental Example has a higher adhesive force than the light-shielding patterns of Comparative Example 1 and Comparative Example 2.

In the case of Comparative Example 1 using titanium black particles, as the thickness is increased, the adhesive force is lowered because UV is blocked by the titanium black particles.

On the other hand, in the case of Comparative Example 2, since the discoloration inducing agent, which is an aliphatic alcohol, reacts with the adhesive resin (urethane compound) to interfere with moisture hardening, the adhesive force of the light blocking pattern is significantly lowered.

However, in the present invention, since the discolored particles 160 are transparent in the UV irradiation process and the discoloring dye 166 of the discolored particles 160 and the discoloration inducing agent 168 are enclosed by the shell 162, It happens enough. Therefore, the light shielding pattern (experimental example) of the present invention has a high adhesive force.

The adhesive strength at high temperature of the light shielding pattern of Comparative Example 1, Comparative Example 2 and Experimental Example was measured and shown in Table 3, and Table 4 shows the room temperature bonding strength (Table 2) and the variation ratio (high temperature deterioration ratio) (High temperature condition: 60 DEG C, 240 hr)

[Table 3]

[Table 4]

As shown in Tables 3 and 4, the light blocking pattern of the experimental example has a lower high temperature deterioration rate than the light blocking pattern of Comparative Example 1 and Comparative Example 2. That is, the light shielding pattern of the present invention has high thermal stability.

In the present invention, since the shell 162, which is made of a polymer having excellent heat resistance, exists in the light blocking pattern 130 in the form of surrounding the color changing dye 166 and the color changing coloring agent 168, the heat blocking property of the light blocking pattern 130 is improved do.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. And changes may be made without departing from the spirit and scope of the invention.

100, 401: display panel 110, 320: liquid crystal cell
130, 360, 490: light blocking pattern 140: black particles
160: discoloration particles 166: discoloration dye
168: discoloration inducing agent 170: black sub-particle
300, 400: display device

Claims (12)

A binder;
A black sub-particle comprising a core and a shell surrounding the core, wherein the black particles dispersed in the binder
/ RTI >
The method according to claim 1,
Wherein the black sub-particle comprises a substance formed by reaction of an aminophloran compound and an aliphatic alcohol.
3. The method of claim 2,
Wherein the aminofluorane compound and the aliphatic alcohol are represented by the following general formulas (1) and (2), wherein R ₁ and R ₂ are each hydrogen or alkyl, and n is an integer of 10 to 40, .
[Chemical Formula 1]

(2)

The method according to claim 1,
Wherein the black sub-particle is represented by the following general formula (3), each of R ₁ and R ₂ is hydrogen or alkyl, and n is an integer of 10 to 40.
(3)

The method according to claim 1,
Wherein the discoloration sub-particle comprises an open aminophloran moiety and an aliphatic alkyl moiety bonded thereto.
The method according to claim 1,
The shell is a transparent light blocking pattern.
The method according to claim 1,
Wherein the shell comprises any one of polyamide, polyether, polyurea, polymethylene, and polyethylene.
A liquid crystal cell;
The liquid crystal display device according to any one of claims 1 to 7,
.
A display panel;
A case for supporting an edge of the display panel;
The light blocking pattern according to any one of claims 1 to 7, which is positioned between the case and the display panel
.
10. The method of claim 9,
And the display panel and the case are bonded by the light blocking pattern.
A display panel;
A case covering a back surface and a side surface of the display panel;
A cover window covering a front surface of the display panel;
The light blocking pattern according to any one of claims 1 to 7, which is located between the case and the cover window
.
12. The method of claim 11,
And the case and the cover window are bonded by the light blocking pattern.

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