KR102162910B1 - Display device - Google Patents

Abstract

The present invention provides a display panel; A first polarizing plate disposed on the first surface of the display panel and including a polarizing layer and a protective film disposed on the polarizing layer; A display comprising a first emission layer positioned between the polarizing layer and the protective film or outside the protective film, wherein the first emission layer emits light of a second wavelength when light of a first wavelength is irradiated. Provide the device.

Description

Display device}

The present invention relates to a display device, and more particularly, to a display device capable of implementing a specific color in response to external light.

In presentations at conferences, etc., a method of projecting material images onto a screen or wall using a projector is widely used. The presenter makes a presentation while pointing at a screen or the like using a laser pointer that projects laser light to a certain place on the presentation image.

Meanwhile, as the information society develops, demands for display devices for displaying images are increasing in various forms. Thinner and lighter liquid crystal display (LCD) devices, plasma display panels (PDP), or organic light emitting diodes (OLED) compared to conventional cathode ray tube display devices (CRT) ) Flat panel display devices including display devices are being actively researched and commercialized.

Among them, liquid crystal display devices are widely used because of their advantages in miniaturization, weight reduction, thinness, and low power driving.

However, when a presentation is conducted using a liquid crystal display, a problem occurs.

That is, when a presentation is performed by projecting a laser pointer onto a liquid crystal display device, unlike the case of using a projector, it is difficult to identify the laser pointer display. In other words, when a presentation is performed using a liquid crystal display device, a problem occurs in that the visibility of the laser pointer is insufficient.

The present invention aims to solve the problem of lack of visibility of a laser pointer in a presentation using a liquid crystal display device.

In order to solve the above problems, the present invention includes a display panel; A first polarizing plate disposed on the first surface of the display panel and including a polarizing layer and a protective film disposed on the polarizing layer; A display comprising a first emission layer positioned between the polarizing layer and the protective film or outside the protective film, wherein the first emission layer emits light of a second wavelength when light of a first wavelength is irradiated. Provide the device.

In the display device of the present invention, the second emission layer is positioned between the polarizing layer and the first emission layer, and further comprises a second emission layer that emits light of a fourth wavelength when light of a third wavelength is irradiated.

In the display device of the present invention, the first wavelength is different from the third wavelength, and the second wavelength is different from the fourth wavelength.

In the display device of the present invention, the third emission layer is positioned between the first emission layer and the second emission layer and emits light of a sixth wavelength when light of a fifth wavelength is irradiated.

In the display device of the present invention, the first wavelength, the third wavelength, and the fifth wavelength are different from each other, and the second wavelength, the fourth wavelength, and the sixth wavelength are different from each other.

In the display device of the present invention, the first emission layer includes a phosphorescent material.

In the display device of the present invention, the first emission layer is formed to correspond to the entire surface of the display panel, includes a phosphorescent material, and is transparent.

In the display device of the present invention, the display panel includes a grid-shaped light blocking means having a first opening corresponding to a pixel region displaying an image and surrounding the pixel region, and the first emitting layer comprises the light blocking means It is characterized by having the same shape as.

In the display device of the present invention, the display panel includes a light blocking means having a first opening corresponding to a pixel region displaying an image, and the first emission layer has an area equal to or larger than the first opening. It is characterized in that it has a second opening completely overlapping with the first opening.

In the display device of the present invention, the light of the second wavelength is red, and the first emission layer includes at least one of europium and praseodymium.

In the display device of the present invention, the light of the second wavelength is green, and the first emission layer includes at least one of terbium and erbium.

In the display device of the present invention, the light of the second wavelength is blue, and the first emission layer includes at least one of Cerium and Thulium.

In the display device of the present invention, the display panel is a liquid crystal panel, and the polarization layer is a linear polarization layer.

In the display device of the present invention, a second polarizing plate positioned outside the second surface of the display panel is further included, and absorption axes of the first polarizing plate and the second polarizing plate are perpendicular to each other.

In the display device of the present invention, the display panel includes an organic light emitting diode, and the polarization layer is a circular polarization layer.

The display device of the present invention includes an emission layer capable of displaying a specific color in response to light having a specific wavelength on the polarizing layer, so that a specific color can be realized in response to external light.

Accordingly, when the laser pointer is used in the display device of the present invention, since the light emitting layer reacts to the laser pointer light, visibility of the laser pointer is improved.

In addition, it is possible to obtain a pointing effect of various colors by using laser pointers of different wavelengths.

In addition, when the display device is turned off, the light emitting layer reacts with external light, thereby having an aesthetic effect of improving the appearance of the display device.

1A and 1B are schematic diagrams for explaining light transmission in a conventional liquid crystal display device.
2 is a schematic cross-sectional view for explaining a decrease in visibility of a laser pointer in a conventional liquid crystal display device.
3 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention.
4 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present invention.
5A to 5C are diagrams for explaining light emission patterns in a light emitting layer used in the display device of the present invention.
6 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention.
7 is a schematic cross-sectional view of a display device according to a fourth exemplary embodiment of the present invention.
FIG. 8 is a diagram for explaining a light emission pattern in a light emitting layer used in the display device of FIG. 7.
9 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention.
10 is a schematic perspective view of a part of the display device of FIG. 9.

1A and 1B are schematic diagrams for explaining light transmission in a conventional liquid crystal display device.

1A and 1B, the liquid crystal display is positioned between a lower substrate SUB1 and an upper substrate SUB2 facing each other and spaced apart from each other, and between the lower substrate SUB1 and the upper substrate SUB2. A liquid crystal panel (LCP) including a liquid crystal layer (LC) including liquid crystal molecules (LCM), and outside each of the lower substrate (SUB1) and the upper substrate (SUB2), that is, on both sides of the liquid crystal panel (LCP). It includes located lower and upper polarizing plates POL1 and POL2, and a backlight unit (not shown).

Although not shown, a plurality of pixels having pixel electrodes formed on the inner surface of the lower substrate SUB1 and a thin film transistor controlling ON/OFF of a liquid crystal driving voltage transmitted to each of the pixel electrodes are formed, and the upper substrate SUB2 ) On the inner surface, a color filter and a common electrode for color realization are provided.

In addition, the liquid crystal layer LC interposed between the lower substrate SUB1 and the upper substrate SUB2 is in the TN mode, and the major axis direction of the liquid crystal molecules LCM is the lower substrate SUB1 and the upper substrate when the voltage is turned off. It shows a 90 degree twisted alignment from the lower substrate (SUB1) to the upper substrate (SUB2) while maintaining parallel to (SUB2), and the absorption axes (or transmission axes) of the lower and upper polarizing plates (POL1, POL2) are Orthogonal. The backlight unit is located on the rear surface of the liquid crystal panel LCP and supplies light to the liquid crystal panel LCP.

When the voltage is off (OFF) as in FIG. 1A, only linearly polarized light parallel to the transmission axis is transmitted by the lower polarizing plate POL1, and the rest is absorbed, and the light emitted from the backlight passes through the liquid crystal layer LC. While rotated by 90 degrees, white is displayed through the upper polarizing plate POL2.

Meanwhile, when the voltage is on as shown in FIG. 1B, the long axes of the liquid crystal molecules LCM are vertically arranged with respect to the lower substrate SUB1 and the upper substrate SUB2, and the linearity transmitted through the lower polarizing plate POL1. Polarized light is blocked by the upper polarizing plate POL2 to display black.

When such a liquid crystal display device is used for presentation, a laser pointer is used, and light from the laser pointer is mostly absorbed or dissipated in the liquid crystal display device, thereby reducing visibility.

That is, as shown in Fig. 2, which is a schematic cross-sectional view for explaining the decrease in laser pointer visibility in a conventional liquid crystal display, the first light L1 from the laser pointer (not shown) passes through the upper polarizing plate POL2. While being absorbed by the upper polarizing plate POL2, only about 50% of the first light L1 passes through the upper polarizing plate POL2. In addition, about 50% of the second light L2 passing through the upper polarizing plate POL2 is reflected and directed to the outside by the third light L3 (L3), and the third light L3 passes the upper polarizing plate POL2. As it passes again, about 50% is absorbed. That is, light loss occurs due to the upper polarizing plate POL2.

As a result, only about 10% of the first light L1 irradiated from the laser pointer is displayed to the outside, thereby deteriorating the visibility of the laser pointer.

This problem occurs in all display devices having a polarizing plate attached to the outside of the display panel. For example, a circular polarizing plate for reducing reflection of external light is attached to the outside of the organic light emitting diode display device, and a similar problem occurs when a laser pointer is applied to the organic light emitting diode display device.

Hereinafter, the present invention capable of solving the above problem will be described in detail with reference to the drawings.

-First Example-

3 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention.

As shown in FIG. 3, the display device 100 according to the first exemplary embodiment of the present invention includes a liquid crystal panel 140 that is a display panel, and a first polarizing plate positioned on a first side of the liquid crystal panel 140. 150), a second polarizing plate 160 positioned on a second side of the liquid crystal panel 140, a light emitting layer 170 positioned inside the second polarizing plate 160, and a lower portion of the first polarizing plate 150 And a backlight unit (not shown) positioned at.

The liquid crystal panel 140 is positioned between the first and second substrates 110 and 130 and the first and second substrates 110 and 130 facing each other and spaced apart from each other, and includes liquid crystal molecules 138. It includes a liquid crystal layer 136.

A gate line (not shown) and a data line (not shown) are formed on the first substrate 110, and the gate line and the data line cross each other to define a pixel region.

In addition, in the pixel region, a thin film transistor Tr electrically connected to the gate line and the data line is positioned at an intersection between the gate line and the data line.

The thin film transistor Tr includes a gate electrode 112 positioned on the first substrate 110, a gate insulating layer 114 covering the gate electrode 112, and the gate electrode on the gate insulating layer 114. A semiconductor layer 116 overlapping 112 and a source electrode 118 and a drain electrode 119 spaced apart from each other on the semiconductor layer 116 are included.

The gate electrode 112 is connected to the gate line, and the source electrode 118 is connected to the data line. Further, the semiconductor layer 116 includes an active layer 116a made of pure amorphous silicon and an ohmic contact layer 116b made of impurity amorphous silicon. In contrast, the semiconductor layer 116 may be made of polysilicon or an oxide semiconductor material, and a thin film transistor (Tr) structure may also be variously changed.

The protective layer 120 in which the drain contact hole 121 exposing the drain electrode 119 is formed is located covering the thin film transistor Tr, and the pixel electrode 122 and the common electrode ( 124) is located. The pixel electrode 122 contacts the drain electrode 119 through the drain contact hole 121, and the common electrode 124 is alternately arranged with the pixel electrode 122.

Meanwhile, on the second substrate 130, a black matrix 132, which is a light blocking means having an opening corresponding to the pixel region, and a color filter layer corresponding to the opening of the pixel region, that is, the black matrix 132 ( 134) is formed. The black matrix 132 blocks light by being formed to correspond to a region other than the pixel region, and may be positioned to correspond to, for example, the gate wiring, the data wiring, and the thin film transistor Tr.

3 shows a structure in which the pixel electrode 122 and the common electrode 124 are formed on the first substrate 110 and are alternately arranged with each other. Alternatively, as the pixel electrode and the common electrode are formed on the first substrate 110, one of them may have a plate shape and the other may have an opening, or the pixel electrode and the common electrode may be formed on different substrates.

The first polarizing plate 150 is positioned under the liquid crystal panel 140, and first and second protective films 154 positioned at both sides of the first polarizing layer 152 and the first polarizing layer 152, 156).

The first polarization layer 152 is for polarizing light from the backlight unit and may be made of polyvinyl alcohol (PVA). The first polarizing layer 152 has an absorption axis in a first direction. That is, the first polarization layer 152 has a transmission axis in a second direction perpendicular to the first direction.

Each of the first and second protective films 154 and 156 may be made of tri-acetyl cellulose (TAC) or cyclic olefin polymer (COP). The first protective film 154 is positioned between the liquid crystal panel 140 and the first polarizing layer 152. Each of the first and second protective films 154 and 156 is for protecting the first polarizing layer 152 and may be omitted.

The second polarizing plate 160 is positioned above the liquid crystal panel 140, and third and fourth protective films 164 positioned on both sides of the second polarizing layer 162 and the second polarizing layer 162, 166).

The second polarizing layer 162 is for polarizing light that has passed through the liquid crystal panel 140 and may be made of polyvinyl alcohol (PVA). For example, it may have an absorption axis in the second direction and a transmission axis in the first direction. That is, the first polarizing plate 152 and the second polarizing plate 162 may have absorption axes perpendicular to each other.

Each of the third and fourth protective films 164 and 166 may be made of tri-acetyl cellulose (TAC) or cyclic olefin polymer (COP). The third protective film 164 is positioned between the liquid crystal panel 140 and the second polarizing layer 162. Each of the third and fourth protective films 164 and 166 is for protecting the second polarizing layer 162 and may be omitted.

The light emitting layer 170 is positioned between the second polarizing layer 162 and the fourth protective film 166. That is, the emission layer 170 is located inside the second polarizing plate 160.

The light emitting layer 170 includes a light emitting material 172, for example, a fluorescent material or a phosphorescent material. For example, a light-emitting material 172 is dispersed in a base film such as tri-acetyl cellulose (TAC), cyclic olefin polymer (COP), or polyethylene terephthalate (PET), and the light-emitting layer 170 Can be achieved. In contrast, the light-emitting material 172 is coated or deposited on the base substrate to form the light-emitting layer 170, or the light-emitting material 172 is coated on the fourth protective film 166 of the second polarizing plate 160 or It may be deposited to form the emission layer 170. The light emitting material 172 may be a transparent nano phosphorescent material or a transparent nano fluorescent material, that is, a nano light emitting material.

The light-emitting material 172 emits light in response to light having a specific wavelength. That is, when light of a first wavelength is irradiated onto the emission layer 170, light of a second wavelength is emitted from the light emitting material 172. The first wavelength and the second wavelength are the same or different.

For example, when a laser of a first wavelength is irradiated onto the emission layer 170 from a laser pointer used for presentation, the emission layer 170 emits light of a second wavelength in response to the laser. In this case, since the light emitting layer 170 is positioned above the second polarizing layer 162, light loss shown in FIG. 2 is prevented. Accordingly, the visibility of the laser pointer is improved.

In addition, when the display device 100 is turned off, that is, when a voltage is not applied to the display device 100, the light emitting layer 170 reacts to external light to emit light of a second wavelength, and thus the display device ( The appearance of 100) is improved. That is, when the conventional liquid crystal display is turned off, only black is displayed, so the appearance is not good, but the display device 100 of the present invention has a specific color even when it is turned off, so that the appearance is improved.

Meanwhile, although a liquid crystal display device including the liquid crystal panel 140 is shown in FIG. 3, it can be applied to any display device in which the polarizing plate is positioned on the display surface side.

For example, in the case of an organic light emitting diode display device, a circular polarizing plate including a polarizing layer is positioned on the display surface side of a display panel including the organic light emitting diode to prevent reflection of external light. When a laser pointer is used in an organic light emitting diode display device, the same light loss problem as in a conventional liquid crystal display device occurs.

However, similar to that shown in FIG. 3, if the light emitting layer 170 is formed on the polarizing layer of the circularly polarizing plate of the organic light emitting diode display, the aforementioned light loss problem is prevented. Therefore, it has the advantage of improving the visibility and appearance of the laser pointer.

-Second embodiment-

4 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present invention.

As shown in FIG. 4, the display device 200 according to the second exemplary embodiment of the present invention includes a liquid crystal panel 240 that is a display panel, and a first polarizing plate positioned on a first side of the liquid crystal panel 240. 250, a second polarizing plate 260 positioned on a second side of the liquid crystal panel 240, a light emitting layer 270 positioned above the second polarizing plate 260, and a lower portion of the first polarizing plate 250 And a backlight unit (not shown) positioned at.

Although not shown, the liquid crystal panel 240 includes a first substrate and a second substrate facing each other and spaced apart from each other, and a liquid crystal layer disposed between the first and second substrates and including liquid crystal molecules.

On the first substrate, a gate line and a data line defining a pixel region, a thin film transistor connected to the gate line and the data line, a pixel electrode connected to the thin film transistor, and a common electrode alternately arranged with the pixel electrode are formed. I can. In addition, on the second substrate, a black matrix having an opening corresponding to the pixel region and a color filter layer corresponding to the pixel region may be formed.

The first polarizing plate 250 is positioned under the liquid crystal panel 240, and first and second protective films 254 positioned at both sides of the first polarizing layer 252 and the first polarizing layer 252, 256). The first polarizing layer 252 may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 254 and 256 is tri-acetyl cellulose (TAC) or cyclic olefin polymer). The first protective film 254 is positioned between the liquid crystal panel 240 and the first polarizing layer 252.

The second polarizing plate 260 is positioned above the liquid crystal panel 240, and third and fourth protective films 264 positioned on both sides of the second polarizing layer 262 and the second polarizing layer 262, 266). The second polarizing layer 262 may be made of polyvinyl alcohol (PVA), and each of the third and fourth protective films 264 and 266 is tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The third protective film 264 is positioned between the liquid crystal panel 240 and the second polarizing layer 262.

The emission layer 270 is positioned on the fourth protective film 266. That is, the second polarizing plate 260 is positioned between the light emitting layer 270 and the liquid crystal panel 240.

The light-emitting layer 270 includes a light-emitting material 272, for example, a fluorescent material or a phosphorescent material. For example, the light emitting material 272 may be dispersed on a base film to form the light emitting layer 270. In contrast, the light-emitting material 272 is coated or deposited on the base substrate to form the light-emitting layer 270, or the light-emitting material 272 is coated on the fourth protective film 266 of the second polarizing plate 260 or It may be deposited to form the emission layer 270. The light emitting material 272 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

As described above, the light emitting material 272 emits light in response to light of a specific wavelength. That is, when light of a first wavelength is irradiated onto the emission layer 270, light of a second wavelength is emitted from the light emitting material 272.

In the display device 200 according to the second embodiment of the present invention, since the light emitting layer 270 that emits light in response to light of a specific wavelength is located above the second polarizing layer 262 of the second polarizing plate 260, External light, for example, the light of the laser pointer is prevented from being lost by the second polarizing layer 262 and is used for light emission from the light emitting layer 270. Therefore, it has the advantage of improving the visibility and appearance of the laser pointer.

The display devices 100 and 200 of the above-described first and second embodiments have a difference in positions of the emission layers 170 and 270. That is, in the display device 100 of the first embodiment, the light-emitting layer 170 is located inside the second polarizing plate 160, whereas in the display device 200 of the second embodiment, the light-emitting layer 270 is the second polarizing plate 260. It is located at the top. However, as long as the light emitting layers 170 and 270 are positioned above the second polarizing layers 162 and 262, there is no limitation on the positions of the light emitting layers 170 and 270.

For example, in the display device 100 of the first embodiment, when the second polarizing plate 160 further includes a separate configuration between the second polarizing layer 162 and the fourth protective film 166, the light emitting layer ( 170) may be positioned between the second polarizing layer 162 and a separate component or between the fourth protective film 166 and a separate component.

In addition, when a separate configuration is positioned on the second polarizing plate 260 in the display device 200 of the second exemplary embodiment, the emission layer 270 may be formed between the second polarizing plate 260 and the separate configuration or the separate configuration. It can be located on top of the composition.

In other words, the positions of the light-emitting layers 170 and 270 may be changed within a range capable of emitting light without loss of light due to the second polarizing layers 160 and 260.

5A to 5C are diagrams for explaining light emission patterns in a light emitting layer used in the display device of the present invention.

As shown in FIGS. 5A to 5C, when light is irradiated to the light emitting layers 170 and 270 including the light emitting material formed on the base substrate (PET), light of a specific wavelength from the light emitting layers 170 and 270 Is emitted.

FIG. 5A is a diagram for explaining red light emission. As shown in FIG. 5A, when light having a wavelength of about 380 to 780 nm is irradiated onto the light emitting layers 170 and 270 including a red phosphor, red phosphorescence The material (Red Phosphor) emits red light in response to light having a wavelength of about 394 to 410 nm, and light having a different wavelength passes through the light emitting layers 170 and 270.

In this case, the red phosphorescent material may include at least one of europium and praseodymium.

Accordingly, when the light emitting layers 170 and 270 of FIG. 3 or 4 include the red phosphor of FIG. 5A, red laser pointing is possible by using a laser pointer having a wavelength of about 394 to 410 nm.

In addition, when the display device is turned off, the light emitting layers 170 and 270 react to external light having a wavelength of about 394 to 410 nm, so that the display device has a red screen.

FIG. 5B is a diagram for explaining green light emission. As shown in FIG. 5B, when light having a wavelength of about 380 to 780 nm is irradiated to the emission layers 170 and 270 including a green phosphor, green phosphorescence The material (Green Phosphor) emits green light in response to light having a wavelength of about 490 to 510 nm, and light having a different wavelength passes through the light emitting layers 170 and 270.

In this case, the green phosphorescent material may include at least one of terbium and erbium.

Accordingly, when the emission layers 170 and 270 of FIG. 3 or 4 include the green phosphor of FIG. 5B, a green laser pointing is possible by using a laser pointer having a wavelength of about 490 to 510 nm.

Further, when the display device is turned off, the light emitting layers 170 and 270 react to external light having a wavelength of about 490 to 510 nm, so that the display device has a green screen.

FIG. 5C is a diagram for explaining blue light emission. As shown in FIG. 5C, when light having a wavelength of about 380 to 780 nm is irradiated to the light emitting layers 170 and 270 including a blue phosphor, blue phosphorescence The material (Blue Phosphor) emits blue light in response to light having a wavelength of about 420 to 440 nm, and light of a different wavelength passes through the light emitting layers 170 and 270.

In this case, the blue phosphor may include at least one of Cerium and Thulium.

Accordingly, when the light-emitting layers 170 and 270 of FIG. 3 or 4 include the blue phosphor of FIG. 5C, blue laser pointing is possible by using a laser pointer having a wavelength of about 420 to 440 nm.

In addition, when the display device is turned off, the light emitting layers 170 and 270 react to external light having a wavelength of about 420 to 440 nm, so that the display device has a blue screen.

-Third Example-

6 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention.

As shown in FIG. 6, the display device 300 according to the third embodiment of the present invention includes a liquid crystal panel 340 that is a display panel, and a first polarizing plate positioned on a first side of the liquid crystal panel 340 ( 350, a second polarizing plate 360 positioned on a second side of the liquid crystal panel 340, a first emission layer 370 positioned inside the second polarizing plate 360, and the second polarizing plate 360 ) And a second light emitting layer 380 positioned above and a backlight unit (not shown) positioned below the first polarizing plate 350.

Although not shown, the liquid crystal panel 340 includes a first substrate and a second substrate facing each other and spaced apart from each other, and a liquid crystal layer disposed between the first and second substrates and including liquid crystal molecules.

On the first substrate, a gate line and a data line defining a pixel region, a thin film transistor connected to the gate line and the data line, a pixel electrode connected to the thin film transistor, and a common electrode alternately arranged with the pixel electrode are formed. I can. In addition, on the second substrate, a black matrix having an opening corresponding to the pixel region and a color filter layer corresponding to the pixel region may be formed.

The first polarizing plate 350 is positioned under the liquid crystal panel 340 and first and second protective films 354 positioned at both sides of the first polarizing layer 352 and the first polarizing layer 352, 356). The first polarizing layer 352 may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 354 and 356 may be tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The first protective film 354 is positioned between the liquid crystal panel 340 and the first polarizing layer 352.

The second polarizing plate 360 is positioned above the liquid crystal panel 340, and third and fourth protective films 364 positioned on both sides of the second polarizing layer 362 and the second polarizing layer 362, 366). The second polarizing layer 362 may be made of polyvinyl alcohol (PVA), and each of the third and fourth protective films 364 and 366 may be tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The third protective film 364 is positioned between the liquid crystal panel 340 and the second polarizing layer 362.

The first emission layer 370 is positioned between the second polarization layer 362 and the fourth protective film 366. That is, the first emission layer 370 is located inside the second polarizing plate 360.

The first light emitting layer 370 includes a first light emitting material 372, for example, a fluorescent material or a phosphorescent material. For example, the first light-emitting material 372 is dispersed in a base film such as tri-acetyl cellulose (TAC), cyclic olefin polymer (COP), or polyethylene terephthalate (PET). The light emitting layer 370 may be formed. In contrast, the first light-emitting material 372 is coated or deposited on the base substrate to form the first light-emitting layer 370, or the first light-emitting material 372 is a fourth protective film of the second polarizing plate 360 The first emission layer 370 may be formed by coating or depositing on the lower surface of the 366. The first light emitting material 372 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

The first light-emitting material 372 emits light in response to light of a specific wavelength. That is, when light of a first wavelength is irradiated onto the first emission layer 370, light of a second wavelength is emitted from the first emission material 372.

The second emission layer 380 is positioned on the second polarizing plate 360. That is, the fourth protective film 366 is positioned between the first emission layer 370 and the second emission layer 380.

The second light-emitting layer 380 includes a second light-emitting material 382, for example, a fluorescent material or a phosphorescent material. For example, the second light-emitting material 382 may be dispersed on a base film to form the second light-emitting layer 380. In contrast, the second light-emitting material 382 is coated or deposited on the base substrate to form the second light-emitting layer 380, or the second light-emitting material 382 is a fourth protective film of the second polarizing plate 360 The second emission layer 380 may be formed by coating or depositing on the upper surface of 366. The second light-emitting material 382 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

The second light-emitting material 382 emits light in response to light of a specific wavelength. That is, when light of a third wavelength is irradiated onto the second emission layer 380, light of a fourth wavelength is emitted from the second emission material 382.

In the display device 300 according to the third exemplary embodiment of the present invention, the first and second emission layers 370 and 380 that emit light in response to light of a specific wavelength are formed in the second polarizing layer 362 of the second polarizing plate 360. ) Since it is located above, external light, for example, light from a laser pointer is used for light emission from the first and second light emitting layers 370 and 380 without loss by the second polarizing layer 362. Therefore, it has the advantage of improving the visibility and appearance of the laser pointer.

Further, the third wavelength is different from the first wavelength, and the fourth wavelength is different from the second wavelength. That is, the first emission layer 370 and the second emission layer 380 react to light of different wavelengths and emit light of different wavelengths.

For example, when the emission layers 170 and 270 shown in FIG. 5A are used for the first emission layer 370 and the emission layers 170 and 270 shown in FIG. 5B are used for the second emission layer 380, When light having a wavelength of about 394 to 410 nm is irradiated onto the display device 300, the first light emitting material 372 of the first light emitting layer 370 reacts to emit red light, and light of a wavelength of about 490 to 510 nm is emitted from the display device 300. ), the second light-emitting material 382 of the second light-emitting layer 380 reacts to emit green light.

Accordingly, laser pointing of various colors is possible using laser pointers of different wavelengths, and when OFF, the display device 300 has a screen of various colors.

-Fourth embodiment-

7 is a schematic cross-sectional view of a display device according to a fourth exemplary embodiment of the present invention.

7, the display device 400 according to the third exemplary embodiment of the present invention includes a liquid crystal panel 440 that is a display panel, and a first polarizing plate positioned on a first side of the liquid crystal panel 440 ( 450, a second polarizing plate 460 positioned on a second side of the liquid crystal panel 440, a first emitting layer 470 positioned inside the second polarizing plate 460, and the second polarizing plate 460 ) A second light emitting layer 480 positioned above, a third light emitting layer 490 positioned above the second light emitting layer 480, and a backlight unit (not shown) positioned below the first polarizing plate 450 Include.

Although not shown, the liquid crystal panel 440 includes a first substrate and a second substrate facing each other and spaced apart from each other, and a liquid crystal layer disposed between the first and second substrates and including liquid crystal molecules.

On the first substrate, a gate line and a data line defining a pixel region, a thin film transistor connected to the gate line and the data line, a pixel electrode connected to the thin film transistor, and a common electrode alternately arranged with the pixel electrode are formed. I can. In addition, on the second substrate, a black matrix having an opening corresponding to the pixel region and a color filter layer corresponding to the pixel region may be formed.

The first polarizing plate 450 is positioned under the liquid crystal panel 440 and first and second protective films 454 positioned on both sides of the first polarizing layer 452 and the first polarizing layer 452, 456). The first polarizing layer 452 may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 454 and 456 is tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The first protective film 454 is positioned between the liquid crystal panel 440 and the first polarizing layer 452.

The second polarizing plate 460 is positioned above the liquid crystal panel 440 and third and fourth protective films 464 positioned on both sides of the second polarizing layer 462 and the second polarizing layer 462, 466). The second polarizing layer 462 may be made of polyvinyl alcohol (PVA), and each of the third and fourth protective films 464 and 466 is tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The third protective film 464 is positioned between the liquid crystal panel 440 and the second polarizing layer 462.

The first emission layer 470 is positioned between the second polarization layer 462 and the fourth protective film 466. That is, the first emission layer 470 is located inside the second polarizing plate 460.

The first light-emitting layer 470 includes a first light-emitting material 472, for example, a fluorescent material or a phosphorescent material. For example, the first light-emitting material 472 is dispersed in a base film such as tri-acetyl cellulose (TAC), cyclic olefin polymer (COP), or polyethylene terephthalate (PET), A light emitting layer 470 may be formed. In contrast, the first light-emitting material 472 is coated or deposited on the base substrate to form the first light-emitting layer 470, or the first light-emitting material 472 is a fourth protective film of the second polarizing plate 460 The first emission layer 470 may be formed by coating or depositing on the lower surface of 466. The first light emitting material 472 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

The first light-emitting material 472 emits light in response to light of a specific wavelength. That is, when light of a first wavelength is irradiated onto the first emission layer 470, light of a second wavelength is emitted from the first emission material 472.

The second emission layer 480 is positioned on the second polarizing plate 460. That is, the fourth protective film 466 is positioned between the first emission layer 470 and the second emission layer 480.

The second light-emitting layer 480 includes a second light-emitting material 482, for example, a fluorescent material or a phosphorescent material. For example, the second light-emitting material 482 may be dispersed on a base film to form the second light-emitting layer 480. In contrast, a second light-emitting material 482 is coated or deposited on the base substrate to form the second light-emitting layer 480, or the second light-emitting material 482 is a fourth protective film of the second polarizing plate 460 It may be coated or deposited on the upper surface of 466 to form the second emission layer 480. The second light-emitting material 482 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

The second light-emitting material 482 emits light in response to light of a specific wavelength. That is, when light of a third wavelength is irradiated onto the second emission layer 480, light of a fourth wavelength is emitted from the second emission material 482.

The third emission layer 490 is positioned on the second emission layer 480. That is, the second emission layer 480 is positioned between the second polarizing plate 460 and the third emission layer 490.

The third light-emitting layer 490 includes a third light-emitting material 492, for example, a fluorescent material or a phosphorescent material. For example, the third light-emitting material 492 may be dispersed on a base film to form the third light-emitting layer 490. Alternatively, the third light-emitting material 492 may be coated or deposited on the base substrate to form the third light-emitting layer 490. The third light emitting material 492 may be a transparent nano phosphorescent material or a transparent nano fluorescent material.

The third light-emitting material 492 emits light in response to light of a specific wavelength. That is, when light of a fifth wavelength is irradiated onto the third emission layer 490, light of a sixth wavelength is emitted from the third emission material 492.

In the display device 400 according to the fourth exemplary embodiment of the present invention, the first to third emission layers 470, 480, and 490 that emit light in response to light of a specific wavelength are the second polarizing layer of the second polarizing plate 460 (462) Since it is located on the top, external light, for example, the light of a laser pointer is used to emit light from the first to third emitting layers 470, 480, 490 without loss by the second polarizing layer 462 . Therefore, it has the advantage of improving the visibility and appearance of the laser pointer.

Further, the first, third, and fifth wavelengths are different from each other, and the second, fourth, and sixth wavelengths are different from each other. That is, the first to third emission layers 470, 480, and 490 react to light of different wavelengths and emit light of different wavelengths.

For example, when each of the light emitting layers 170 and 270 shown in FIGS. 5A to 5C is used for the first to third light emitting layers 470, 480, and 490, light having a wavelength of about 394 to 410 nm is transmitted to the display device ( When irradiated to the display device 400, the first light-emitting material 472 of the first light-emitting layer 470 reacts to emit red light, and when light having a wavelength of about 490 to 510 nm is irradiated onto the display device 400, the second light-emitting layer 480 is The second light-emitting material 482 reacts to emit green light. In addition, when light having a wavelength of about 420 to 440 nm is irradiated onto the display device 400, the third light emitting material 492 of the third light emitting layer 490 reacts to emit blue light.

Accordingly, laser pointing of various colors is possible using laser pointers of different wavelengths, and when OFF, the display device 400 has screens of various colors.

In the display devices 300 and 400 of the third and fourth exemplary embodiments of FIGS. 6 and 7, the first emission layers 370 and 470 are positioned inside the second polarizing plates 360 and 460, and the second emission layer 380 or A structure in which the second emission layer 480 and the third emission layer 490 are stacked on the second polarizing plates 360 and 460 is shown.

In contrast, in the display device 300 of the third exemplary embodiment, both the first and second emission layers 370 and 380 are the second polarizing layer 362 and the fourth protective film 366 of the second polarizing plate 360. It may be positioned between or above the second polarizing plate 360.

In addition, in the display device 400 of the fourth exemplary embodiment, all of the first to third light emitting layers 470, 480, and 490 are formed of the second polarizing layer 462 and the fourth protective film 466 of the second polarizing plate 460. ) Or may be positioned above the second polarizing plate 460.

FIG. 8 is a diagram for explaining a light emission pattern in a light emitting layer used in the display device of FIG. 7.

As shown in FIG. 8, when light is irradiated to the first to third light emitting layers 470, 480, and 490 including a light emitting material formed on the base substrate (PET), the first to third light emitting layers ( Light of a specific wavelength is emitted from 470, 480, 490).

That is, the red phosphor of the first emission layer 470 emits red light in response to light having a wavelength of about 394 to 410 nm, and light of another wavelength passes through the first emission layer 470, and the second emission layer The green phosphor of 480 emits green light in response to light having a wavelength of about 490 to 510 nm, and light of a different wavelength passes through the second emission layer 480, and the blue color of the third emission layer 490 The phosphorescent material (Blue Phosphor) emits blue light in response to light having a wavelength of about 420 to 440 nm, and light having a different wavelength passes through the third emission layer 490.

Therefore, it is possible to use a laser pointer that irradiates lasers of various wavelength bands, and when OFF, the first to third emission layers 470, 480, 490 react to external light, so that the display device 400 displays red, green, and blue screens. Will have.

-The fifth embodiment-

9 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present invention, and FIG. 10 is a schematic perspective view of a part of the display device of FIG. 9.

As shown in FIG. 9, the display device 500 according to the fifth embodiment of the present invention includes a liquid crystal panel 540 that is a display panel, and a first polarizing plate positioned on a first side of the liquid crystal panel 540 ( 550, a second polarizing plate 560 positioned on a second side of the liquid crystal panel 540, a light emitting pattern 570 positioned inside the second polarizing plate 560, and the first polarizing plate 550 It includes a backlight unit (not shown) positioned below.

The liquid crystal panel 540 is positioned between the first and second substrates 510 and 530 and the first and second substrates 510 and 530 facing and spaced apart from each other, and includes liquid crystal molecules (not shown). It includes a liquid crystal layer 536.

Although not shown, on the first substrate 510, a gate line and a data line defining a pixel region, a thin film transistor connected to the gate line and the data line, a pixel electrode connected to the thin film transistor, and the pixel electrode are alternately Arranged common electrodes may be formed.

Further, on the second substrate 530, a black matrix 532 which is a light blocking means having an opening corresponding to the pixel region and a color filter layer (not shown) corresponding to the pixel region may be formed.

That is, referring to FIG. 10, the black matrix 532 surrounds a pixel area and has a lattice shape in which a first opening OP1 is formed corresponding to the pixel area.

Referring back to FIG. 9, the first polarizing plate 550 is positioned under the liquid crystal panel 540 and positioned at both sides of the first polarizing layer 552 and the first polarizing layer 552. It includes a second protective film (554, 556). The first polarizing layer 552 may be made of polyvinyl alcohol (PVA), and each of the first and second protective films 554 and 556 is tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The first protective film 554 is positioned between the liquid crystal panel 540 and the first polarizing layer 552.

The second polarizing plate 560 is positioned above the liquid crystal panel 540, and third and fourth protective films 564 positioned on both sides of the second polarizing layer 562 and the second polarizing layer 562, 566). The second polarizing layer 562 may be made of polyvinyl alcohol (PVA), and each of the third and fourth protective films 564 and 566 may be tri-acetyl cellulose (TAC) or cyclic cellulose (COP). olefin polymer). The third protective film 564 is positioned between the liquid crystal panel 540 and the second polarizing layer 562.

The light emitting pattern 570 is positioned between the second polarizing layer 562 and the fourth protective film 566. That is, the light emitting pattern 570 is located inside the second polarizing plate 560.

The light-emitting pattern 570 includes a light-emitting material, for example, a fluorescent material or a phosphorescent material. The light emitting material may be a transparent nano phosphorescent material or a transparent nano fluorescent material. The light-emitting material emits light in response to light of a specific wavelength. That is, when light of a first wavelength is irradiated onto the light emitting pattern 570, light of a second wavelength is emitted from the light emitting material.

The light-emitting pattern 570 is coated and patterned on the fourth protective film 566 and thus has substantially the same shape as the black matrix 532. That is, referring to FIG. 10, a second opening OP2 corresponding to the first opening op1 of the black matrix 532 is formed in the light emitting pattern 570, and the light emitting pattern 570 covers a pixel area. It has an enclosing grid shape.

As described above, the light emitting pattern 570 emits light in response to light of a specific wavelength. When the light emitting layer is formed over the entire display area as shown in FIGS. 3, 4, 6, and 7, the light of the backlight unit As the light emitting layer emit light, there may be a problem that the display quality of the liquid crystal panel is deteriorated.

However, if the light emitting pattern 570 has a lattice shape overlapping the black matrix 532 as in the fifth embodiment of the present invention, since the light of the backlight unit is covered by the black matrix 532, the above You can avoid problems.

In addition, as shown in FIGS. 3, 4, 6, and 7, when the emission layer is formed over the entire display area, the emission layer must have high transparency in order to prevent a decrease in transmittance. That is, the light emitting material of the light emitting layer may be a transparent nano light emitting material. However, as shown in FIGS. 9 and 10, when the light emitting pattern 570 overlaps the black matrix 532, a transparent characteristic is not required. That is, the light emitting pattern 570 may be transparent or opaque.

In FIG. 10, it is shown that the light-emitting pattern 570 has the same shape as the black matrix 532, but there is no limitation on the shape as long as the light-emitting pattern 570 overlaps the black matrix 532. That is, in order to prevent light emission of the light emitting pattern 570 by light from the backlight unit, the second opening op2 of the light emitting pattern 570 is the first opening op1 of the black matrix 532 in which an image is displayed. It has the same or larger area as) and can be completely overlapped. Further, the light emitting patterns 570 need not be continuous, and may be a plurality of patterns spaced apart from each other.

Since the light-emitting material of the light-emitting pattern 572 emits light of a specific wavelength in response to external light and is located above the second polarizing layer 562, the light-emitting pattern 570 is not lost by the second polarizing layer 562 ) Is used. Therefore, it has the advantage of improving the visibility and appearance of the laser pointer.

Meanwhile, in FIG. 9, the light-emitting pattern 570 may include different light-emitting materials for each location to emit light of different colors.

Further, similarly to FIG. 4, the light emitting pattern 570 may be positioned on the fourth protective film 566. In addition, similar to FIG. 6 or 7, another light-emitting pattern or light-emitting layer may be additionally formed on or under the light-emitting pattern 570.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

140, 240, 340, 440, 540: display panel (liquid crystal panel)
150, 250, 350, 450, 550: first polarizing plate
152, 252, 352, 452, 552: first polarizing layer
160, 260, 360, 460, 560: second polarizing plate
162, 262, 362, 462, 562: second polarizing layer
170, 270, 370, 380, 470, 480, 490: light emitting layer
570: light emission pattern
172, 272, 372, 382, 472, 482, 492: luminescent material

Claims (19)

A display panel;
A first polarizing plate disposed on the first surface of the display panel and including a polarizing layer and a protective film disposed on the polarizing layer;
Including a first light-emitting layer positioned between the polarizing layer and the protective film or outside the protective film,
The first emission layer emits light of a second wavelength when light of a first wavelength is irradiated,
The first emission layer is formed to correspond to the entire surface of the display panel, includes a phosphorescent material, and is transparent.
The method of claim 1,
And a second emission layer positioned between the polarizing layer and the first emission layer and emitting light of a fourth wavelength when light of a third wavelength is irradiated.
The method of claim 2,
The first wavelength is different from the third wavelength, and the second wavelength is different from the fourth wavelength.
The method of claim 2,
And a third emission layer positioned between the first emission layer and the second emission layer and emitting light of a sixth wavelength when light of a fifth wavelength is irradiated.
The method of claim 4,
The first wavelength, the third wavelength, and the fifth wavelength are different from each other, and the second wavelength, the fourth wavelength, and the sixth wavelength are different from each other.
The method of claim 1,
The first emission layer comprises a phosphorescent material.
delete A display panel;
A first polarizing plate disposed on the first surface of the display panel and including a polarizing layer and a protective film disposed on the polarizing layer;
Including a first light-emitting layer positioned between the polarizing layer and the protective film or outside the protective film,
The first emission layer emits light of a second wavelength when light of a first wavelength is irradiated,
The display panel includes a grid-shaped light blocking means having a first opening corresponding to a pixel region displaying an image and surrounding the pixel region,
The display device, wherein the first emission layer has the same shape as the light blocking means.
A display panel;
A first polarizing plate disposed on the first surface of the display panel and including a polarizing layer and a protective film disposed on the polarizing layer;
Including a first light-emitting layer positioned between the polarizing layer and the protective film or outside the protective film,
The first emission layer emits light of a second wavelength when light of a first wavelength is irradiated,
The display panel includes a light blocking means having a first opening corresponding to a pixel area displaying an image,
The first emission layer has an area equal to or larger than the first opening and has a second opening completely overlapping with the first opening.
The method according to any one of claims 1, 8 and 9,
The light of the second wavelength is red, and the first emission layer includes at least one of europium and praseodymium.
The method according to any one of claims 1, 8 and 9,
The light of the second wavelength is green, and the first emission layer includes at least one of terbium and erbium.
The method according to any one of claims 1, 8 and 9,
The light of the second wavelength is blue, and the first emission layer includes at least one of Cerium and Thulium.
The method according to any one of claims 1, 8 and 9,
The display panel is a liquid crystal panel, and the polarizing layer is a linear polarizing layer.
The method of claim 13,
Further comprising a second polarizing plate positioned outside the second surface of the display panel,
The display device, wherein absorption axes of the first polarizing plate and the second polarizing plate are perpendicular to each other.
The method of claim 1,
Wherein the display panel includes an organic light emitting diode, and the polarization layer is a circular polarization layer. The method of claim 8 or 9,
And a second emission layer positioned between the polarizing layer and the first emission layer and emitting light of a fourth wavelength when light of a third wavelength is irradiated.
The method of claim 16,
The first wavelength is different from the third wavelength, and the second wavelength is different from the fourth wavelength.
The method of claim 16,
And a third emission layer positioned between the first emission layer and the second emission layer and emitting light of a sixth wavelength when light of a fifth wavelength is irradiated.
The method of claim 18,
The first wavelength, the third wavelength, and the fifth wavelength are different from each other, and the second wavelength, the fourth wavelength, and the sixth wavelength are different from each other.

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