KR101837503B1 - Organic Light Emitting Diode Display Device - Google Patents

Abstract

The organic light emitting diode display of the present invention includes a display panel including a first electrode, a light emitting layer, and a second electrode; a first external light blocking layer and / or a second external light blocking layer on the display panel; And a cover window on the upper side of the linear polarizer, wherein the first external light blocking layer or the cover window has a light transmitting portion transmitting light and a light absorbing pattern absorbing light . Therefore, the organic light emitting diode display device of the present invention can prevent reflection of external light and can restrict the viewing angle.

Description

[0001] The present invention relates to an organic light emitting diode (OLED) display device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode display device, and more particularly to an organic light emitting diode display device capable of limiting a viewing angle.

2. Description of the Related Art Flat panel displays having excellent characteristics such as thinning, lightening, and low power consumption have been widely developed and applied to various fields.

Among the flat panel display devices, an organic light emitting diode (OLED) display device, also referred to as an organic electroluminescent display device or organic electroluminescent display device, An exciton is formed by injecting an electric charge into a light emitting layer formed between an anode which is an injection electrode and an electron and a hole, and then the light is emitted while disappearing. Such an organic light emitting diode display device can be formed not only on a flexible substrate such as a plastic but also because it has a large contrast ratio and response time of several microseconds since it is a self- It is easy to manufacture and design a driving circuit because it is easy to operate, is not limited in viewing angle, is stable at a low temperature, and can be driven at a relatively low voltage of 5 V to 15 V DC.

The organic light emitting diode display device can be classified into a passive matrix type and an active matrix type according to a driving method. An active type organic light emitting diode display device capable of low power consumption, fixed size, and large size is widely used in various display devices. .

FIG. 1 is a diagram showing a structure of a general organic light emitting diode display device in a band diagram.

1, an organic light emitting diode display device includes a light emitting material layer 4 between an anode 1, which is an anode, and a cathode 7, which is an anode. . Emitting material layer 4 and between the anode 1 and the luminescent material layer 4 and between the cathode 7 and the luminescent material layer 4 to inject holes from the anode 1 and electrons from the cathode 7 into the luminescent material layer 4. [ A hole transporting layer 3 and an electron transporting layer 5 are disposed between the electron transporting layer 5 and the electron transporting layer 5, respectively. A hole injecting layer 2 is formed between the anode 1 and the hole transporting layer 3 and electrons are injected between the electron transporting layer 5 and the cathode 7 in order to more efficiently inject holes and electrons. And an electron injecting layer (6).

1, the lower line is the highest energy level of the valence band, the highest occupied molecular orbital (HOMO), the upper line is the lowest energy level of the conduction band, LUMO (lowest unoccupied molecular orbital). The energy difference between the HOMO level and the LUMO level is the band gap.

(+) Injected from the anode 1 into the light emitting material layer 4 through the hole injecting layer 2 and the hole transporting layer 3 and positive holes injected from the cathode 7 into the light emitting material layer 4 in the organic light emitting diode display device having such a structure Electrons injected into the light emitting material layer 4 through the electron injecting layer 6 and the electron transporting layer 5 are combined with each other to form an exciton 8. From this exciton 8, And emits light of a color corresponding to the band gap of the layer (4).

As mentioned above, the organic light emitting diode display device has no limitation on the viewing angle, but recently it has been required to limit the viewing angle due to protection of privacy and protection of information.

In addition, when the organic light emitting diode display device is used as a display device for providing driving information for a vehicle, there is a problem that the image displayed by the organic light emitting diode display device is reflected on the windshield of the vehicle, thereby obstructing the driver's view. The reflection of the image in such a vehicle is particularly severe at nighttime, thereby hindering safe driving. Therefore, it is necessary to limit the viewing angle of the organic light emitting diode display device applied to the vehicle.

A structure in which a light control film is applied to limit the viewing angle has been proposed. However, since the cost of the film is increased, the manufacturing cost of the display device is increased and the thickness of the display device is increased due to the addition of the film, .

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above problems, and it is an object of the present invention to limit the viewing angle of an organic light emitting diode display.

In addition, the present invention is intended to solve the problem of obstructing the view of the driver by the organic light emitting diode display device.

According to an aspect of the present invention, there is provided an organic light emitting diode display comprising: a display panel including a first electrode, a light emitting layer, and a second electrode; a first external light blocking layer and / And a linear polarizer on the first external light blocking layer and / or the second external light blocking layer, wherein the first external light blocking layer includes a light transmitting portion having a phase delay and a light absorbing pattern for absorbing light.

The light transmitting portion of the first external light blocking layer may be a sine wave plate having a phase delay of? / 4, and the second external light blocking layer may be a half wave plate having a phase delay of? / 2, Lt; / RTI >

Alternatively, the light transmitting portion of the first external light blocking layer may be a half wave plate having a phase delay of? / 2, and the second external light blocking layer may be a quarter wave plate having a phase delay of? / 4. May be located between the barrier layers.

Another organic light emitting diode display device of the present invention includes a display panel including a first electrode, a light emitting layer, and a second electrode; a first external light blocking layer and / or a second external light blocking layer on the display panel; And a cover window on the upper side of the polarizing plate, wherein the cover window includes a light transmitting portion that transmits light and a light absorbing pattern that absorbs light.

The first external light blocking layer and / or the second external light blocking layer may be disposed on the display panel of the organic light emitting diode display device to prevent the external light from being reflected on the display panel, thereby improving the contrast ratio .

Further, the first external light shielding layer or the cover window includes a light absorption pattern, so that the viewing angle of the display device can be limited at a relatively low cost.

In addition, since no additional film is added, the thickness of the organic light emitting diode display device can be reduced.

When an organic light emitting diode display device including such a light absorption pattern is applied to a vehicle, it is possible to prevent the image from being reflected on the front windshield window, thereby preventing disturbance of the driver's view.

FIG. 1 is a diagram showing a structure of a general organic light emitting diode display device in a band diagram.
2 is a cross-sectional view schematically showing an organic light emitting diode display device according to a first embodiment of the present invention.
3 is a cross-sectional view schematically illustrating a display panel of an organic light emitting diode display according to a first embodiment of the present invention.
4 is a view showing a change in polarization state of external light in the organic light emitting diode display according to the first embodiment of the present invention in a Poincare sphere.
5 is a cross-sectional view schematically showing an example of the external light shielding layer according to the first embodiment of the present invention.
6 is a plan view schematically showing an example of the external light shielding layer according to the first embodiment of the present invention.
7 is a plan view schematically showing another example of the external light shielding layer according to the first embodiment of the present invention.
8A and 8B are cross-sectional views schematically showing another example of the external light shielding layer according to the first embodiment of the present invention.
FIG. 9 is a view schematically showing a vehicle equipped with the organic light emitting diode display device according to the first embodiment of the present invention.
10 is a schematic enlarged view of a part of a vehicle equipped with the organic light emitting diode display according to the first embodiment of the present invention.
11 is a cross-sectional view schematically showing an organic light emitting diode display device according to a second embodiment of the present invention
12 is a view showing a change in polarization state of external light in the organic light emitting diode display according to the second embodiment of the present invention in a Poincare sphere.
13 is a graph showing a change in luminance according to a viewing angle with respect to the pitch and height of the light absorption pattern of the first external light blocking layer according to the second embodiment of the present invention.
14 is a cross-sectional view schematically showing an organic light emitting diode display device according to a third embodiment of the present invention.
15 is a cross-sectional view schematically showing an organic light emitting diode display device according to a fourth embodiment of the present invention.

The organic light emitting diode display device of the present invention includes a display panel including a first electrode, a light emitting layer, and a second electrode, a first external light shielding layer above the display panel, and a linear polarizing plate above the first external light shielding layer And the first external light blocking layer includes a light transmitting portion having a phase delay and a light absorbing pattern for absorbing light.

The light transmitting portion of the first external light blocking layer has a phase delay of? / 4.

The organic light emitting diode display of the present invention may further include a second external light blocking layer having a phase delay of? / 2 between the first external light blocking layer and the linear polarizing plate.

Alternatively, the organic light emitting diode display of the present invention may further include a second external light blocking layer between the display panel and the first external light blocking layer.

At this time, the light transmitting portion of the first external light blocking layer has a phase delay of? / 2, and the second external light blocking layer has a phase delay of? / 4.

The height of the light absorption pattern is equal to or smaller than the thickness of the light transmitting portion.

The width of the light absorption pattern increases from the display panel toward the linear polarizer.

Another organic light emitting diode display device of the present invention includes a display panel including a first electrode, a light emitting layer, and a second electrode, an external light blocking layer on the display panel, a linear polarizing plate on the external light blocking layer, And a cover window on the upper portion of the polarizing plate, wherein the cover window includes a light transmitting portion transmitting light and a light absorbing pattern absorbing light.

The height of the light absorption pattern is smaller than the thickness of the light transmitting portion.

The width of the light absorption pattern increases from the display panel toward the cover window.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

- First Embodiment -

FIG. 2 is a cross-sectional view schematically showing an organic light emitting diode display device according to a first embodiment of the present invention, FIG. 3 is a schematic view of a display panel of the organic light emitting diode display device according to the first embodiment of the present invention In a sectional view, one pixel region is shown.

2, the organic light emitting diode display 100 according to the first embodiment of the present invention includes a display panel 110, an external light blocking layer 150 disposed on the top of the display panel 110, And a linear polarizer 170 positioned above the external light blocking layer 150.

An adhesive or an adhesive may be disposed between the display panel 110 and the external light blocking layer 150 and between the external light blocking layer 150 and the linear polarizing plate 170.

The display panel 110 is an organic light emitting diode panel and includes an organic light emitting diode De including a first electrode 132 and a light emitting layer 136 and a second electrode 138 on a substrate 112.

Referring to FIG. 3, the organic light emitting diode panel 110 includes an insulating substrate 112, and a semiconductor layer 114 patterned on the insulating substrate 112 is formed. The substrate 112 may be a glass substrate or a plastic substrate. The semiconductor layer 114 may be made of an oxide semiconductor material. Alternatively, the semiconductor layer 114 may be made of polycrystalline silicon. In this case, impurities may be doped on both edges of the semiconductor layer 114.

A gate insulating layer 116 made of an insulating material is formed on the entire surface of the substrate 112 on the semiconductor layer 114. The gate insulating film 116 may be formed of an inorganic insulating material such as silicon oxide (SiO ₂ ). When the semiconductor layer 114 is made of polycrystalline silicon, the gate insulating layer 116 may be formed of silicon oxide (SiO ₂ ) or silicon nitride (SiNx).

A gate electrode 118 made of a conductive material such as a metal is formed on the gate insulating film 116 in correspondence with the center of the semiconductor layer 114. A gate wiring (not shown) and a first capacitor electrode (not shown) are formed on the gate insulating film 116. Although not shown, the gate wiring extends along one direction, and the first capacitor electrode is connected to the gate electrode 118.

In the first embodiment of the present invention, the gate insulating layer 116 is formed on the entire surface of the substrate 112, but the gate insulating layer 116 may be patterned to have the same shape as the gate electrode 118.

An interlayer insulating film 120 made of an insulating material is formed on the entire surface of the substrate 112 over the gate electrode 118, the gate wiring, and the first capacitor electrode. The interlayer insulating film 120 may be formed of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiN x), or may be formed of an organic insulating material such as benzocyclobutene or photo acryl .

The interlayer insulating film 120 has first and second contact holes 120a and 120b exposing upper surfaces on both sides of the semiconductor layer 114. [ The first and second contact holes 120a and 120b are spaced apart from the gate electrode 118 on both sides of the gate electrode 118. Here, the first and second contact holes 120a and 120b are also formed in the gate insulating film 116. Alternatively, when the gate insulating film 116 is patterned in the same shape as the gate electrode 118, the first and second contact holes 120a and 120b are formed only in the interlayer insulating film 120. [

On the interlayer insulating layer 120, source and drain electrodes 122 and 124 are formed of a conductive material such as a metal. Further, a data line (not shown) and a second capacitor electrode (not shown) are formed on the interlayer insulating film 120.

The source and drain electrodes 122 and 124 are spaced about the gate electrode 118 and contact both sides of the semiconductor layer 118 through the first and second contact holes 120a and 120b, respectively. Although not shown, the data wiring extends along the direction intersecting the gate wiring and crosses the gate wiring to define the pixel region. The second capacitor electrode is connected to the source electrode 122, overlaps the first capacitor electrode, and forms the storage capacitor with the dielectric interlayer 120 between the two.

At this time, power supply wiring (not shown) may be further formed on the interlayer insulating film 120, and power supply wiring for supplying a high potential voltage may be located apart from the data wiring.

On the other hand, the semiconductor layer 114, the gate electrode 118, and the source and drain electrodes 122 and 124 constitute a thin film transistor. Here, the thin film transistor has a coplanar structure in which the gate electrode 118 and the source and drain electrodes 122 and 124 are located on one side of the semiconductor layer 114, that is, above the semiconductor layer 114.

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

Here, the thin film transistor corresponds to a driving thin film transistor of the organic light emitting diode panel 110, and a switching thin film transistor (not shown) having the same structure as the driving thin film transistor is further formed on the substrate 112. The gate electrode 118 of the driving thin film transistor is connected to the drain electrode (not shown) of the switching thin film transistor and the source electrode 122 of the driving thin film transistor is connected to the power supply wiring (not shown). In addition, a gate electrode (not shown) and a source electrode (not shown) of the switching thin film transistor are connected to the gate wiring and the data wiring, respectively.

A protective film 126 is formed on the entire surface of the substrate 112 as an insulating material over the source and drain electrodes 122 and 124, the data line, and the second capacitor electrode. The protective film 126 is flat on the top surface and has a drain contact hole 126a exposing the drain electrode 124. [ Here, the drain contact hole 126a is formed directly on the second contact hole 120b, but may be formed apart from the second contact hole 120b.

The protective film 126 may be formed of an organic insulating material such as benzocyclobutene or photoacryl.

A first electrode 132 is formed on the passivation layer 126 with a conductive material having a relatively high work function. The first electrode 132 is formed for each pixel region and contacts the drain electrode 124 through the drain contact hole 126a. For example, the first electrode 132 may be formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

On the first electrode 132, a bank layer 134 is formed of an insulating material. The bank layer 134 covers the edge of the first electrode 132 and has a through hole 134a for exposing the first electrode 132. [

A light-emitting layer 136 is formed on the first electrode 132 exposed through the transmission hole 134a of the bank layer 134. The light emitting layer 136 includes a light-emitting material layer.

A second electrode 138 is formed on the entire surface of the substrate 112 with a conductive material having a relatively low work function above the light emitting layer 136. Here, the second electrode 138 may be formed of aluminum, magnesium, silver, or an alloy thereof.

The light emitting layer 136 further includes a hole injecting layer and a hole transporting layer sequentially stacked from the top of the first electrode 132 between the first electrode 132 and the light emitting material layer And may further include an electron transporting layer and an electron injecting layer sequentially stacked from the top of the light emitting material layer between the light emitting material layer and the second electrode 138.

The first electrode 132, the light emitting layer 136 and the second electrode 138 constitute an organic light emitting diode De. The first electrode 132 serves as an anode and the second electrode 138 serves as an anode. Serves as a cathode.

An encapsulation layer 142 is formed on the entire surface of the substrate 112 and an opposing substrate 144 is disposed on the encapsulation layer 142. [

The encapsulation layer 142 may be a face seal using a sealing material or may have a structure in which several layers of an inorganic film / an organic film / an inorganic film are stacked. The encapsulation layer 142 prevents external moisture from penetrating into the organic light emitting diode De to prevent damage to the organic light emitting diode De.

The encapsulation layer 142 may be formed on the counter substrate 144 and the encapsulation layer 142 may be formed on the counter substrate 144 and the encapsulation layer 142 and the second electrode The counter substrate 144 and the substrate 112 can be bonded together so that the counter substrate 144 and the counter substrate 138 contact each other.

Alternatively, after the encapsulation layer 142 is directly formed on the second electrode 138, the counter substrate 144 is disposed on the encapsulation layer 142 to form the counter substrate 144 and the substrate 112 May be cemented together.

Here, the organic light emitting diode panel 110 according to the first embodiment of the present invention may be a top emission type in which light emitted from the light emitting layer 136 is output to the outside through the second electrode 138 have. At this time, the first electrode 132 further includes a reflective layer (not shown) made of an opaque conductive material. For example, the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy, and the first electrode 132 may have a triple-layer structure of ITO / APC / ITO. Also, the second electrode 138 may have a relatively thin thickness to allow light to pass therethrough, and the light transmittance of the second electrode 138 may be about 45-50%.

Alternatively, the organic light emitting diode panel 110 may be a bottom emission type in which light emitted from the light emitting layer 136 is output to the outside through the first electrode 132. When the organic light emitting diode panel 110 is a bottom emission type, the position of the substrate 112 and the organic light emitting diode De in the display panel 110 of FIG. 2 may be changed. 2, the substrate 112 of the display panel 110 is positioned between the external light blocking layer 150 and the organic light emitting diode De.

Referring again to FIG. 2, the external light blocking layer 150 on the display panel 110 includes a quarter wave plate (QWP) 152. The sine wave plate 152 has a phase delay of? / 4 and changes the polarization direction of incident light by 90 degrees. Therefore, the linearly polarized light having passed through the s-wave plate 152 is converted into the circularly polarized light, and the circularly polarized light having passed through the s-wave plate 152 is changed into the linearly polarized light.

In addition, the external light blocking layer 150 includes the light absorbing pattern 154 to limit the viewing angle of the display device. More specifically, a plurality of light absorption patterns 154 are spaced apart from each other in the four-sided wave plate 152, and a portion of the s-wave plate 152 between the adjacent light absorption patterns 154 becomes a light transmission portion. Here, each of the light absorption patterns 154 may have a width that increases as the light travels.

The light absorption pattern 154 may be formed of a black resin or a dye that absorbs light. When the light absorbing pattern 154 is made of a dye, the light absorbing pattern 154 may include at least four to five kinds of dyes that absorb light of different colors.

On the other hand, the linear polarizer 170 on the outer light blocking layer 150 absorbs linearly polarized light parallel to the absorption axis of the linear polarizer 170 and transmits linearly polarized light perpendicular to the absorption axis.

The linear polarizer 170 may include a polarizing layer and the polarizing layer may be formed of polyvinyl alcohol (PVA) drawn by dyes of iodine ions or dichroic dyes. have. At this time, the linear polarizer 170 may further include first and second protective films on both sides of the polarizing layer. The first and second protective films may be formed of one selected from triacetyl cellulose (TAC), cyclic olefin polymer (COP), and polyethylene terephthalate (PET) It is not limited. Alternatively, the linear polarizer 170 may further include a protective film on only one side of the polarizing layer, and the other side of the polarizing layer may contact the external light blocking layer 150.

Meanwhile, the polarizing layer may be composed of a reactive mesogen (RM) and a dichroic dye. In this case, the linear polarizer 170 may further include an alignment layer for arranging the reactive mesogen and the dichroic dye.

Here, it is preferable that the optical axis of the quarter wave plate 152 be at 45 degrees with the absorption axis of the linear polarizer 170.

Although not shown, a cover window for protecting the display panel 110 from external impact may be further provided on the linear polarizer 170. [ The cover window may be made of glass or plastic.

FIG. 4 is a view showing a polarization state change of an external light in a poincare sphere in an organic light emitting diode display according to a first embodiment of the present invention.

The Poincaré phrases represent all polarization states of light on a spherical surface, the equator represents a linear polarization, the pole S3 represents left-handed circular polarization, the opposite pole, -S3, is a right- handed circular polarization, while the upper half represents left-handed elliptical polarization and the lower half represents right-handed elliptical polarization.

The polarized state of light passing through the linear polarizer (170 in FIG. 2) is defined as a starting point SP. After passing through the external light blocking layer (150 in FIG. 2) and reflected by the display panel (110 in FIG. 2) The polarization state of light reaching the linear polarizer (170 in FIG. 2) passing through the blocking layer (150 in FIG. 2) is defined as an end point EP and the polarization state change of light between the start point SP and the end point EP / RTI > Here, the transmission axis of the linear polarizer (170 in Fig. 2) is parallel to the polarization direction at point S1 on the equator, and the linear polarization state at this time is 0 degree.

Therefore, as shown in FIG. 4, external light incident on the linearly polarizing plate (170 in FIG. 2) passes through the linearly polarizing plate (170 in FIG. 2) and becomes a 0 degree linearly polarized light state 2) of the display panel (110 in Fig. 2) and becomes the right-handed circularly polarized light state (P2) while passing through the quarter wave plate (152 in Fig. (150 in Fig. 2), and reaches the linear polarizer (170 in Fig. 2) by passing through the quarter wave plate (152 in Fig. Here, when the display panel (110 of FIG. 2) is the top emission type, light is reflected by the reflection layer of the display panel (110 of FIG. 2), and when the display panel And may be reflected at the second electrode (138 in Fig. 2) of the display panel (110 in Fig. 2).

The polarized state (EP) of light reaching the linear polarizer (170 in Fig. 2) becomes perpendicular to the transmission axis of the linear polarizer (170 in Fig. 2). That is, since the polarization state EP of the light reaching the linear polarizer 170 (FIG. 2) is parallel to the absorption axis of the linear polarizer 170 (FIG. 2), it is absorbed in the linear polarizer 170 It does not.

2) of the external light blocking layer (150 in FIG. 2) through the linear polarizer (170 in FIG. 2) is absorbed by the light absorption pattern (154 in FIG. 2) , And is not output to the outside.

2) of the organic light emitting diode display 100 according to the first embodiment of the present invention is configured such that external light is reflected by the display panel 110 (FIG. 2) using the external light shielding layer 150 Output can be blocked.

Meanwhile, the external light blocking layer according to the first embodiment of the present invention restricts the viewing angle, and will be described in detail with reference to the drawings.

FIG. 5 is a cross-sectional view schematically showing an example of the external light blocking layer according to the first embodiment of the present invention, and FIG. 6 is a plan view schematically showing an example of the external light blocking layer according to the first embodiment of the present invention.

5 and 6, the external light shielding layer 150 includes a splay wave plate 152 and a plurality of light absorbing patterns 154.

The sine wave plate 152 has a phase delay of? / 4 and changes the polarization direction of incident light by 90 degrees. For example, the splay wave plate 152 may be formed by stretching a cyclic olefin polymer (COP), but is not limited thereto.

The light absorption pattern 154 is made of a material that absorbs light. For example, the light absorbing pattern 154 may be formed by patterning the stretched cyclic olefin polymer to form a hole, applying a material capable of absorbing light in the hole, and curing the applied material. The light absorption pattern 154 may be formed of a black resin or a dye.

The light absorption pattern 154 extends in the first direction and is spaced apart in the second direction perpendicular to the first direction, and the s-wave plate 152 is positioned between the adjacent light absorption patterns 154. Each of the light absorption patterns 154 preferably has a light propagation direction, that is, a width increasing from the lower end toward the upper end, but is not limited thereto.

Here, the distance between the centers of the light absorption patterns 154, that is, the pitch of the light absorption patterns 154, may be 10 to 300 micrometers, preferably 10 to 150 micrometers, , And 10 to 80 micrometers. As the pitch p of the light absorption pattern 154 increases, the transmittance increases and the front luminance increases.

The distance d between the light absorbing patterns 154, that is, the distance between the adjacent light absorbing patterns 154 can be determined by the pitch p of the light absorbing patterns 154 and the width of the light absorbing patterns 154, It is preferable that the interval d between the light absorbing patterns 154 is smaller than the pitch p of the light absorbing patterns 154 and the maximum width of the light absorbing patterns 154 is larger than the pitch p of the light absorbing patterns 154. [ Lt; / RTI >

The height h of the light absorption pattern 154 may be equal to the thickness of the splay wave plate 152. The height h of the light absorption pattern 154 may be 10 to 300 micrometers, preferably 30 to 210 micrometers, and more preferably 30 to 150 micrometers. 6, the length of the light absorption pattern 154 in the first direction is preferably smaller than the length of the splay wave plate 152 in the first direction.

2) of the display panel (110 of FIG. 2) in the organic light-emitting diode display device including the external light-shielding layer 150, And is output to the outside through the input /

At this time, the first light L1 incident in the direction perpendicular to the external light blocking layer 150 passes through the quarter wave plate 152 of the external light blocking layer 150 and then passes through the linear optical plate 170 And the image is displayed as it is output to the outside.

On the other hand, the second light L2 incident on the external light blocking layer 150 at an angle of more than a predetermined angle is absorbed by the light absorbing pattern 154 of the external light blocking layer 150. Therefore, the incident light having an angle larger than a certain angle is absorbed by the light absorption pattern 154, so that the viewing angle of the organic light emitting diode display device can be limited.

Here, the second light L2 may have an angle greater than 30 degrees with respect to a direction perpendicular to the external light blocking layer 150. [

2) of the display panel (110 of FIG. 2) using the external light blocking layer 150 including the light absorbing pattern 154, the organic light emitting diode display 100 according to the first embodiment of the present invention, It is possible to restrict the viewing angle.

The external light shielding layer according to the first embodiment of the present invention may have a different structure from the previous example.

FIG. 7 is a plan view schematically showing another example of the external light blocking layer according to the first embodiment of the present invention. FIGS. 8A and 8B schematically show another example of the external light blocking layer according to the first embodiment of the present invention. Fig.

7, the external light shielding layer 150 includes a splay wave plate 152 and a plurality of light absorbing patterns 154. As shown in FIG. The light absorption pattern 154 extends in the first direction and is spaced apart in the second direction perpendicular to the first direction, and the s-wave plate 152 is positioned between the adjacent light absorption patterns 154. Here, the length of the light absorption pattern 154 in the first direction may be the same as the length of the four-sided wave plate 152 in the first direction.

At this time, as shown in FIG. 8A, the height of the light absorption pattern 154 may be smaller than the thickness of the four-sided wave plate 152.

8B, the height of the light absorption pattern 154 may be equal to the thickness of the splay wave plate 152, and the external light shielding layer 150 may be formed of a base film (for example, 156). The base film 156 may be made of a transparent polymer material such as polyethylene terephthalate (PET), but is not limited thereto.

Each of the light absorption patterns 154 preferably has a light propagation direction, that is, a width increasing from the lower end toward the upper end, but is not limited thereto. The distance between the centers of the light absorption patterns 154, that is, the center of the adjacent light absorption patterns 154, may be 10 to 300 micrometers, preferably 10 to 150 micrometers, and more preferably 10 to 80 microameters Meter. In addition, the height of the light absorption pattern 154 may be 10 to 300 micrometers, preferably 30 to 210 micrometers, and more preferably 30 to 150 micrometers.

FIG. 9 is a schematic view illustrating a vehicle equipped with the organic light emitting diode display according to the first embodiment of the present invention. FIG. 10 is a schematic view of a vehicle equipped with the organic light emitting diode display according to the first embodiment of the present invention. Fig. 1 is a schematic enlarged view of a part of the apparatus shown in Fig.

9 and 10, the organic light emitting diode display 100 according to the first embodiment of the present invention is installed inside a vehicle 190, and the driver 192 drives the organic light emitting diode display 100 And the like. The organic light emitting diode display device 100 includes an external light blocking layer 150 (FIG. 5) having a light absorbing pattern 154 (FIG. 5) located under the front window glass 196 of the vehicle 190.

The organic light emitting diode display 100 according to the first embodiment of the present invention is limited in viewing angle, and in particular, light outside the upper viewing angle? 1 is cut off, 100 are prevented from being reflected by the front window glass 196. [

Thus, it is possible to provide the driver 192 with necessary information without disturbing the field of view of the driver 192. [

- Second Embodiment -

11 is a cross-sectional view schematically showing an organic light emitting diode display device according to a second embodiment of the present invention.

11, the organic light emitting diode display 200 according to the second embodiment of the present invention includes a display panel 210, a first external light blocking layer 250 disposed on the display panel 210 A second external light blocking layer 260 located on the first external light blocking layer 250 and a linear polarizing plate 270 located on the second external light blocking layer 260. [

The first external light shielding layer 250 and the second external light shielding layer 260 and between the display panel 210 and the first external light shielding layer 250 and between the second external light shielding layer 260 and the linear polarizer 270, An adhesive or a pressure-sensitive adhesive may be disposed.

The display panel 210 is an organic light emitting diode panel and includes an organic light emitting diode De including a first electrode 232 and a light emitting layer 236 and a second electrode 238 on a substrate 212. The display panel 210 may have the same structure as that shown in Fig.

The first electrode 132 serves as an anode and the second electrode 238 serves as a cathode.

Here, the display panel 210 may be a top emission type in which light emitted from the light emitting layer 236 is output to the outside through the second electrode 238. At this time, the first electrode 232 further includes a reflective layer (not shown) made of an opaque conductive material. For example, the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy, and the first electrode 232 may have a triple-layer structure of ITO / APC / ITO. Also, the second electrode 238 may have a relatively thin thickness to allow light to pass therethrough, and the second electrode 238 may have a light transmittance of about 45-50%.

Alternatively, the display panel 210 may be a bottom emission type in which light emitted from the light emitting layer 236 is output to the outside through the first electrode 232. At this time, the positions of the substrate 212 and the organic light emitting diode De may be changed, and the substrate 212 of the display panel 210 may be positioned between the first external light blocking layer 250 and the organic light emitting diode De Structure.

The first external light blocking layer 250 on the display panel 210 includes a quarter wave plate (QWP) 252. The sine wave plate 252 has a phase delay of? / 4 and changes the polarization direction of incident light by 90 degrees. Therefore, the linearly polarized light having passed through the quarter wave plate 252 is converted into circularly polarized light, and the circularly polarized light having passed through the quarter wave plate 252 is converted into linearly polarized light. For example, the splay wave plate 252 can be formed by stretching a cyclic olefin polymer (COP), but is not limited thereto.

Further, the first external light blocking layer 250 includes a light absorbing pattern 254 to limit the viewing angle of the display device. More specifically, the plurality of light absorbing patterns 254 extend in the first direction and are spaced apart from each other in the second direction perpendicular to the first direction so that the splay wave plate 252 between the adjacent light absorbing patterns 254, The portion becomes the light transmitting portion. Here, each of the light absorption patterns 254 may have a width that increases as the direction of light progresses.

The pitch of the light absorption pattern 254 may be 10 to 300 micrometers, preferably 10 to 150 micrometers, and more preferably 10 to 80 micrometers. In addition, the height of the light absorption pattern 254 may be 10 to 300 micrometers, preferably 30 to 210 micrometers, and more preferably 30 to 150 micrometers.

The light absorbing pattern 254 is made of a material that absorbs light. For example, the light absorption pattern 254 can be formed by patterning a stretched cyclic olefin polymer to form a hole, applying a light absorbing material in the hole, and then curing. The light absorption pattern 254 may be made of black resin or dye, but is not limited thereto.

The first external light blocking layer 250 according to the second embodiment of the present invention may have the structure shown in FIGS. 5 to 8B.

The second external light blocking layer 260 on the first external light blocking layer 250 includes a half wave plate (HWP). The half wave plate has a phase retardation of? / 2 and changes the polarization direction of incident light by 180 degrees. The second external light shielding layer 260 may be formed by stretching a cyclic olefin polymer, but is not limited thereto.

On the other hand, the linear polarizer 270 on the second outer light blocking layer 260 absorbs linearly polarized light parallel to the absorption axis of the linear polarizer 270 and transmits linearly polarized light perpendicular to the absorption axis.

The linear polarizer 270 may include a polarizing layer and the polarizing layer may be formed of polyvinyl alcohol (PVA) drawn by dying iodine ions or dichroic dyes. have. At this time, the linear polarizer 270 may further include first and second protective films on both sides of the polarizing layer. The first and second protective films may be formed of one selected from triacetyl cellulose (TAC), cyclic olefin polymer (COP), and polyethylene terephthalate (PET) It is not limited. Alternatively, the linear polarizer 270 may further include a protective film on only one side of the polarizing layer, and the other side of the polarizing layer may contact the second outer light blocking layer 260.

Meanwhile, the polarizing layer may be composed of a reactive mesogen (RM) and a dichroic dye. In this case, the linear polarizer 270 may further include an alignment layer for arranging the reactive mesogen and the dichroic dye.

Here, the optical axis of the half wave plate of the second external light blocking layer 260 is preferably 15 degrees with the absorption axis of the linear polarizer 270. The optical axis of the quarter wave plate 252 of the first external light blocking layer 250 preferably has an angle of 75 degrees with the optical axis of the half wave plate of the second external light blocking layer 260.

Although not shown, a cover window for protecting the display panel 210 from an external impact may be further disposed on the linear polarizer 270. The cover window may be made of glass or plastic.

12 is a view showing a change in polarization state of external light in the organic light emitting diode display according to the second embodiment of the present invention in a Poincare sphere.

The polarized state of light passing through the linear polarizer (270 in FIG. 11) is defined as a start point (SP), and the light passes through the second external light blocking layer 260 (FIG. 11) and the first external light blocking layer After being reflected by the panel (210 in Fig. 11), the light passes through the first external light blocking layer (250 in Fig. 11) and the second external light blocking layer (260 in Fig. 11) and reaches the linear polarizing plate Shows the polarization state change of light between the start point (SP) and the end point (EP) with the polarization state of light as the end point (EP). Here, the transmission axis of the linear polarizer (270 in Fig. 11) is parallel to the polarization direction at point S1 on the equator, and the linear polarization state at this time is 0 degree. 11) and the optical axis of the half-wave plate of the second external light blocking layer (260 in Fig. 11) form an angle of &thetas; and the half axis of the second external light blocking layer The optical axis of the quarter wave plate (252 in Fig. 11) of the optical axis of the long plate and the first external light blocking layer (250 of Fig. 11) forms an angle of (90-theta).

12, external light incident on the linear polarizer 270 (FIG. 11) passes through the linear polarizer 270 (FIG. 11) and becomes a linearly polarized light state (SP) of 0 degrees, (FIG. 11) 260 while passing through the half-wave plate (252 in FIG. 11) of the first external light blocking layer (250 in FIG. 11) 11) of the first external light shielding layer (250 in Fig. 11), and is reflected by the display panel (210 in Fig. 11) to become the right circular polarization state (P3) (90 degrees) while passing through the half wave plate of the second external light shielding layer (260 in Fig. 11), and becomes linear polarized light state (EP) 11). 11) of the display panel (210 of FIG. 11) is reflected by the reflective layer of the display panel (210 of FIG. 11), and when the display panel And may be reflected at the second electrode (238 in Fig. 11) of the display panel (210 in Fig. 11).

The polarized state EP of the light reaching the linear polarizer (270 in FIG. 11) becomes perpendicular to the transmission axis of the linear polarizer (270 in FIG. 11). 11) is parallel to the absorption axis of the linearly polarizing plate (270 in FIG. 11), it is absorbed in the linearly polarizing plate (270 in FIG. 11) It does not.

11) incident on the light absorption pattern (254 in FIG. 11) of the first external light blocking layer (250 in FIG. 11) through the linear polarizer (270 in FIG. 11) and the second external light blocking layer Light is absorbed in the light absorption pattern (254 in Fig. 11), and thus is not output to the outside.

11) of the organic light emitting diode display 200 according to the second embodiment of the present invention uses external light such as 250 and 260 of the first and second external light shielding layers 11 210) and can be prevented from being output. As shown in FIG. 4, red, green, and blue (R, G, B) light is dispersed in the organic light emitting diode display device according to the first embodiment including one external light blocking layer, The organic light emitting diode display device (200 of FIG. 11) according to the second embodiment including the first and second external light blocking layers (250 and 260 of FIG. 11) R, G. B) Since the light reaches the linearly polarizing plate (270 in FIG. 11) with almost no dispersion, reflection of external light can be completely blocked.

11) of the display panel (210 of FIG. 11) including the light absorption pattern 254, the first external light blocking layer 250 may be formed on the organic light emitting diode display panel 200 It is possible to restrict the viewing angle by preventing the emitted light from being output in a specific direction.

13 is a graph showing a change in luminance according to a viewing angle with respect to the pitch and height of the light absorption pattern of the first external light blocking layer according to the second embodiment of the present invention.

Here, a case (Ex1) in which the first external light shielding layer having no light absorption pattern (Ref.) And a first external light shielding layer having a light absorption pattern pitch of 116 micrometers and a height of 201 micrometers are included, , And a case (Ex2) in which the light absorption pattern includes a first external light blocking layer having a pitch of 19 micrometers and a height of 33 micrometers.

As shown in Fig. 13, when the first external light shielding layer without the light absorption pattern is included (Ref.) And the luminance at the front face (0 degree) is 100%, the luminance at 30 degrees is about 85 %, And the luminance at 50 degrees is about 43%.

On the other hand, in the case where the light absorption pattern includes the first external light blocking layer having a pitch of 116 micrometers and a height of 201 micrometers (Ex1), the luminance at 30 degrees is about 26%, the luminance at 50 degrees is about 3 %to be.

Further, in the case of including the first external light shielding layer (Ex2) having a light absorption pattern pitch of 19 micrometers and a height of 33 micrometers, the luminance at 30 degrees is about 16%, the luminance at 50 degrees is about 1 %to be.

Therefore, by adjusting the pitch and height of the light absorption pattern within 10 to 300 micrometers, it is possible to limit the viewing angle of 30 degrees above and below.

- Third Embodiment -

14 is a cross-sectional view schematically showing an organic light emitting diode display device according to a third embodiment of the present invention.

14, the organic light emitting diode display 300 according to the third exemplary embodiment of the present invention includes a display panel 310, a first external light blocking layer 350 located on the top of the display panel 310, A second external light blocking layer 360 located on the first external light blocking layer 350 and a linear polarizing plate 370 located on the second external light blocking layer 360. [

The first external light shielding layer 350 and the second external light shielding layer 360 and between the display panel 310 and the first external light shielding layer 350 and between the first external light shielding layer 350 and the second external light shielding layer 360 and between the second external light shielding layer 360 and the linear polarizing plate 370, An adhesive or a pressure-sensitive adhesive may be disposed.

The display panel 310 is an organic light emitting diode panel and includes an organic light emitting diode De including a first electrode 332 and a light emitting layer 336 and a second electrode 338 on a substrate 312. The display panel 310 may have the same structure as that shown in Fig.

The first electrode 332 serves as an anode and the second electrode 338 serves as a cathode.

Here, the display panel 310 may be a top emission type in which light emitted from the light emitting layer 336 is output to the outside through the second electrode 338. At this time, the first electrode 332 further includes a reflective layer (not shown) made of an opaque conductive material. For example, the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy, and the first electrode 332 may have a triple-layer structure of ITO / APC / ITO. Also, the second electrode 338 may have a relatively thin thickness to allow light to pass therethrough, and the second electrode 338 may have a light transmittance of about 45-50%.

Alternatively, the display panel 310 may be a bottom emission type in which light emitted from the light emitting layer 336 is output to the outside through the first electrode 332. The position of the substrate 312 and the organic light emitting diode De may be changed and the substrate 312 of the display panel 310 may be positioned between the first external light blocking layer 350 and the organic light emitting diode De Structure.

The first external light blocking layer 350 on the display panel 310 includes a quarter wave plate (QWP). The sine wave plate has a phase delay of? / 4 and changes the polarization direction of the incident light by 90 degrees. Therefore, the linearly polarized light passing through the sine wave plate is converted into the circularly polarized light, and the circularly polarized light passing through the sine wave plate is converted into the linearly polarized light. For example, the tetragonal plate may be formed by stretching a cyclic olefin polymer (COP), but is not limited thereto.

The second outer light blocking layer 360 on the first outer light blocking layer 350 includes a half wave plate (HWP) 362. The half wave plate 362 has a phase delay of lambda / 2 to change the polarization direction of incident light by 180 degrees. The half wave plate 362 can be formed by stretching a cyclic olefin polymer, but is not limited thereto.

Further, the second external light blocking layer 360 includes a light absorbing pattern 364 to limit the viewing angle of the display device. More specifically, the plurality of light absorbing patterns 364 extend in the first direction and are spaced apart in the second direction perpendicular to the first direction, so that the half wave plate 362 portion between the adjacent light absorbing patterns 364 Becomes a light transmitting portion. Here, each of the light absorption patterns 364 may have a width that increases as the light travels in the light traveling direction.

The pitch of the light absorption pattern 364 may be 10 to 300 micrometers, preferably 10 to 150 micrometers, and more preferably 10 to 80 micrometers. In addition, the height of the light absorption pattern 364 may be 10 to 300 micrometers, preferably 30 to 210 micrometers, and more preferably 30 to 150 micrometers.

The light absorption pattern 364 is made of a material that absorbs light. For example, the light absorption pattern 364 can be formed by patterning the stretched cyclic olefin polymer to form a hole, applying a light absorbing material in the hole, and then curing. The light absorption pattern 364 may be made of black resin or dye, but is not limited thereto.

The second external light blocking layer 360 according to the third embodiment of the present invention may have the same plane and sectional structure as the external light blocking layer shown in Figs. 5 to 8B.

On the other hand, the linear polarizer 370 on the second outer light blocking layer 360 absorbs linearly polarized light parallel to the absorption axis of the linear polarizer 370 and transmits linearly polarized light perpendicular to the absorption axis.

The linear polarizer 370 may include a polarizing layer and the polarizing layer may be formed of poly-vinyl alcohol (PVA) drawn by dying iodine ions or dichroic dyes. have. At this time, the linear polarizer 370 may further include first and second protective films on both sides of the polarizing layer. The first and second protective films may be formed of one selected from triacetyl cellulose (TAC), cyclic olefin polymer (COP), and polyethylene terephthalate (PET) It is not limited. Alternatively, the linear polarizer 370 may further include a protective film on only one side of the polarizing layer, and the other side of the polarizing layer may contact the second outer light blocking layer 360.

Meanwhile, the polarizing layer may be composed of a reactive mesogen (RM) and a dichroic dye. In this case, the linear polarizer 370 may further include an alignment layer for arranging the reactive mesogen and the dichroic dye.

Here, the optical axis of the half wave plate 362 of the second external light blocking layer 360 is preferably 15 degrees with the absorption axis of the linear polarizer 370. The optical axis of the quarter wave plate of the first external light blocking layer 350 is preferably 75 degrees with the optical axis of the half wave plate 362 of the second external light blocking layer 360.

Although not shown, a cover window for protecting the display panel 310 from external impact may be further disposed on the linear polarizer 370. [ The cover window may be made of glass or plastic.

As described above, in the organic light emitting diode display 300 according to the third embodiment of the present invention, external light is reflected by the display panel 310 and then output using the first and second external light blocking layers 350 and 360 You can block things. At this time, as compared with the organic light emitting diode display device according to the first embodiment including one external light blocking layer, reflection of external light can be completely blocked.

In the organic light emitting diode display 300 according to the third embodiment of the present invention, the second external light blocking layer 350 includes the light absorbing pattern 354, and the light emitted from the display panel 310 is emitted in a specific direction It is possible to restrict the viewing angle.

- Fourth Embodiment -

15 is a cross-sectional view schematically showing an organic light emitting diode display device according to a fourth embodiment of the present invention.

15, the organic light emitting diode display 400 according to the fourth embodiment of the present invention includes a display panel 410, a first external light blocking layer 450 located on the top of the display panel 410, A second external light blocking layer 460 disposed on the first external light blocking layer 450 and a linear polarizing plate 470 disposed on the second external light blocking layer 460, As shown in FIG. The first external light blocking layer 450 and the second external light blocking layer 460 and between the display panel 410 and the first external light blocking layer 450 and between the first external light blocking layer 450 and the second external light blocking layer 460 and between the second external light blocking layer 460 and the linear polarizing plate 470 And an adhesive or a pressure sensitive adhesive may be disposed between the linear polarizer 470 and the cover window 480, respectively.

The display panel 410 is an organic light emitting diode panel and includes an organic light emitting diode De including a first electrode 432 and a light emitting layer 436 and a second electrode 438 on a substrate 412. The display panel 410 may have the same structure as that shown in Fig.

The first electrode 432 serves as an anode and the second electrode 438 serves as a cathode.

Here, the display panel 410 may be a top emission type in which light emitted from the light emitting layer 436 is output to the outside through the second electrode 438. At this time, the first electrode 432 further includes a reflective layer (not shown) made of an opaque conductive material. For example, the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy, and the first electrode 432 may have a triple-layer structure of ITO / APC / ITO. In addition, the second electrode 438 may have a relatively thin thickness to allow light to pass therethrough, and the second electrode 438 may have a light transmittance of about 45-50%.

Alternatively, the display panel 410 may be a bottom emission type in which light emitted from the light emitting layer 436 is output to the outside through the first electrode 432. At this time, the positions of the substrate 412 and the organic light emitting diode De can be changed, and the substrate 412 of the display panel 410 is positioned between the first external light blocking layer 350 and the organic light emitting diode De Structure.

The first external light blocking layer 450 on the display panel 410 includes a quarter wave plate (QWP). The sine wave plate has a phase delay of? / 4 and changes the polarization direction of the incident light by 90 degrees. Therefore, the linearly polarized light passing through the sine wave plate is converted into the circularly polarized light, and the circularly polarized light passing through the sine wave plate is converted into the linearly polarized light. For example, the tetragonal plate may be formed by stretching a cyclic olefin polymer (COP), but is not limited thereto.

The second external light blocking layer 460 on the first external light blocking layer 450 includes a half wave plate (HWP). The half wave plate has a phase retardation of? / 2 and changes the polarization direction of incident light by 180 degrees. The half-wave plate can be formed by stretching a cyclic olefin polymer, but is not limited thereto.

The second external light blocking layer 460 may be omitted.

On the other hand, the linear polarizer 470 on the second outer light blocking layer 460 absorbs linearly polarized light parallel to the absorption axis of the linear polarizer 470 and transmits linearly polarized light perpendicular to the absorption axis.

The linear polarizer 470 may include a polarizing layer and the polarizing layer may be formed of polyvinyl alcohol (PVA) drawn by dying iodine ions or dichroic dyes. have. At this time, the linear polarizer 470 may further include first and second protective films on both sides of the polarizing layer. The first and second protective films may be formed of one selected from triacetyl cellulose (TAC), cyclic olefin polymer (COP), and polyethylene terephthalate (PET) It is not limited. Alternatively, the linear polarizer 470 may further include a protective film on only one side of the polarizing layer, and the other side of the polarizing layer may contact the second outer light blocking layer 460.

Meanwhile, the polarizing layer may be composed of a reactive mesogen (RM) and a dichroic dye. In this case, the linear polarizer 470 may further include an alignment layer for arranging the reactive mesogen and the dichroic dye.

Here, the optical axis of the half wave plate of the second external light blocking layer 460 is preferably 15 degrees with the absorption axis of the linear polarizer 470. The optical axis of the quarter wave plate of the first external light blocking layer 450 preferably has an angle of 75 degrees with the optical axis of the half wave plate of the second external light blocking layer 460.

The cover window 480 above the linearly polarizing plate 470 protects the display panel 410 from an external impact. The cover window 480 may be made of glass or plastic.

In addition, the cover window 480 includes a light absorbing pattern 484 to limit the viewing angle of the display device. More specifically, the plurality of light absorbing patterns 484 extend in a first direction and are spaced apart in a second direction perpendicular to the first direction so that portions of the cover window 480 between the light absorbing patterns 488 And becomes a light transmitting portion. Here, each of the light absorption patterns 484 may have a width that increases as the light travels in the direction of the light.

The pitch of the light absorption pattern 484 may be 10 to 300 micrometers, preferably 10 to 150 micrometers, and more preferably 10 to 80 micrometers. In addition, the height of the light absorption pattern 484 may be 10 to 300 micrometers, preferably 30 to 210 micrometers, and more preferably 30 to 150 micrometers.

The light absorption pattern 484 is made of a material that absorbs light. For example, the light absorption pattern 484 may be formed by patterning the cover window 480 to form a groove, applying a light absorbing material in the groove, and then curing the material. The light absorption pattern 484 may be formed of a black resin or a dye, but is not limited thereto. At this time, the height of the light absorption pattern 484 is preferably smaller than the thickness of the cover window 480.

As described above, in the organic light emitting diode display 400 according to the fourth embodiment of the present invention, external light is reflected from the display panel 410 using the first and second external light blocking layers 450 and 460, You can block things. At this time, as compared with the organic light emitting diode display device according to the first embodiment including one external light blocking layer, reflection of external light can be completely blocked.

The organic light emitting diode display 400 according to the fourth embodiment of the present invention includes a cover window 480 including a light absorbing pattern 484 so that light emitted from the display panel 410 is output in a specific direction It is possible to restrict the viewing angle.

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 or scope of the invention as defined in the appended claims. It can be understood that

100: organic light emitting diode display device 110: display panel
112: substrate 132: first electrode
136: light emitting layer 138: second electrode
De: organic light emitting diode 150: external light blocking layer
152: Four-wave plate 154: Light absorption pattern
170: linear polarizer

Claims (11)

A display panel including a first electrode, a light emitting layer, and a second electrode;
A first external light blocking layer on the display panel;
The linear polarizer on the upper part of the first external light blocking layer
/ RTI >
Wherein the first external light blocking layer includes a light transmitting portion having a phase delay and a light absorbing pattern for absorbing light,
And a second external light blocking layer between the display panel and the linear polarizer,
Wherein the light transmitting portion of the first external light blocking layer has any one of phase delays of? / 4 and? / 2, and the second external light blocking layer has any one of phase delays of? / 4 and? / 2 Light emitting diode display.
The method according to claim 1,
Wherein the first external light shielding layer is positioned between the display panel and the second external light shielding layer, the light transmitting portion of the first external light shielding layer has a phase delay of? / 4, Of the organic light emitting diode display device.
3. The method of claim 2,
Wherein the optical axis of the second external light blocking layer forms an angle of 15 degrees with the absorption axis of the linear polarizing plate and the optical axis of the light transmitting portion of the first external light blocking layer is 75 degrees with the optical axis of the second external light blocking layer Device.
The method according to claim 1,
Wherein the first external light blocking layer is positioned between the second external light blocking layer and the linear polarizing plate, and the light transmitting portion of the first external light blocking layer has a phase delay of? / 2.
5. The method of claim 4,
Wherein an optical axis of the light transmitting portion of the first external light blocking layer forms an angle of 15 degrees with an absorption axis of the linear polarizing plate and an optical axis of the second external light blocking layer is an organic light emitting diode display having an angle of 75 degrees with the optical axis of the first external light blocking layer Device.
The method according to claim 1,
Wherein a height of the light absorption pattern is equal to or smaller than a thickness of the light transmission portion.
The method according to claim 1,
Wherein a width of the light absorption pattern increases from the display panel toward the linear polarizer.



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