KR102598924B1 - Organic light emitting diodes display panel - Google Patents

Abstract

The present invention relates to an organic light emitting display panel, and particularly to an organic light emitting display panel that has space utilization, interior design, and design effects even in a non-driving state.
A feature of the present invention is that a polarizer for blocking external light is provided with a retardation plate that can selectively phase delay external light, and an image pattern is formed in a dead zone area of the pixel area that does not substantially emit light.
Through this, when the OLED is in a non-driving mode that does not display an image, a specific pattern or image can be implemented by external light on the OLED's standby screen, so a specific pattern by the image pattern implemented on the OLED's standby screen can be created. Or images can give a spatially natural feeling, realizing space utilization, interior design, and design effects.

Description

Organic light emitting diodes display panel}

The present invention relates to an organic light emitting display panel, and particularly to an organic light emitting display panel that has space utilization, interior design, and design effects even in a non-driving state.

In recent years, as society has entered a full-fledged information age, the display field, which processes and displays large amounts of information, has developed rapidly, and in response to this, various flat panel display devices have been developed and are in the spotlight.

Specific examples of such flat panel displays include Liquid Crystal Display device (LCD), Plasma Display Panel device (PDP), Field Emission Display device (FED), and electroluminescent display device. (Electroluminescence Display device: ELD), organic light emitting diodes (OLED), etc. These flat panel displays show excellent performance in terms of thinness, weight, and low power consumption, compared to the existing cathode ray tube (CRT). ) is rapidly replacing.

Among the above flat panel displays, organic light-emitting devices (hereinafter referred to as OLEDs) are self-emitting devices and do not require the backlight used in liquid crystal displays, which are non-light-emitting devices, so they can be lightweight and thin.

In addition, it has an excellent viewing angle and contrast ratio compared to liquid crystal displays, is advantageous in terms of power consumption, can be driven at low direct current voltage, has a fast response speed, is strong against external shocks because the internal components are solid, and has a wide operating temperature range. It has advantages.

In particular, because the manufacturing process is simple, it has the advantage of significantly reducing production costs compared to existing liquid crystal display devices.

OLEDs with these characteristics are largely divided into a passive matrix type and an active matrix type. The passive matrix type consists of devices in a matrix form with crossing signal lines, while the active matrix type consists of pixels A thin film transistor, which is a switching element that turns on/off, is located for each pixel.

Recently, the passive matrix type has many limiting factors in terms of resolution, power consumption, lifespan, etc., so research on active matrix type OLED that can realize high resolution or large screens is being actively conducted.

Figure 1 is a diagram schematically showing a cross section of a typical active matrix type OLED, and the OLED is a top emitting type.

As shown, in the OLED 10, a substrate 1 on which a driving thin film transistor DTr and a light emitting diode E are formed is encapsulated by a protective film 12.

Looking at this in more detail, a driving thin film transistor (DTr) is formed for each pixel region (SP) on the upper part of the first substrate 1, and a first electrode 11 connected to each driving thin film transistor (DTr) and An organic light-emitting layer 13 that emits light of a specific color is formed on top of the first electrode 11, and a second electrode 15 is formed on top of the organic light-emitting layer 13.

The organic light emitting layer 13 expresses red (R), green (G), and blue (B) colors. In a general method, red (R), green (G), and blue (B) are used for each pixel area (SP). ) Separate organic materials (13a, 13b, 13c) that emit color are patterned and used.

These first and second electrodes 11 and 15 and the organic light emitting layer 13 formed between them form a light emitting diode (E). At this time, the OLED 10 having this structure consists of the first electrode 11 as an anode and the second electrode 15 as a cathode.

A protective film 12 in the form of a thin film is formed on the driving thin film transistor DTr and the light emitting diode E, and the OLED 10 is encapsulated through the protective film 12.

However, this OLED 10 has the disadvantage that contrast is greatly reduced depending on the intensity of external light. Therefore, in order to prevent a decrease in contrast due to external light, a polarizer 20 for blocking external light reflection is attached to the OLED 10 on the top of the protective film 12 through which light is emitted.

That is, the OLED 10 improves contrast by forming a polarizer 20 to block external light incident from the outside in the transmission direction of light emitted through the organic light emitting layer 13.

The polarizing plate 20 is a circularly polarizing plate for blocking external light and is composed of a retardation plate and a linear polarizing plate.

Meanwhile, when the OLED (10) is in a non-driving mode that does not display an image, it is in a standby screen state, and the standby screen state is normally black mode (normally black mode) and normally white mode (normally white mode). , only black or white is displayed.

This OLED (10) gives an unnatural feeling spatially, and has no space utilization, interior design, or design effects.

The present invention is intended to solve the above problems, and aims to provide an OLED that has space utilization, interior design, and design effects in a non-driving state.

In order to achieve the above-mentioned object, the present invention forms an image pattern corresponding to a dead zone in the pixel area to provide an OLED that has space utilization, interior design, and design effects in a non-driving state. , a retardation plate including a liquid crystal layer and optionally having a 1/4λ phase retardation value, and a polarizer including a linear polarizer formed on the top of the retardation plate are positioned on top of the OLED.

At this time, the retardation plate has a phase delay value of 1/4λ when in a driving mode in which light is emitted from the light emitting diode, and has a phase delay value of 0 when in a non-driving mode in which light is not emitted from the light emitting diode, so that the OLED displays the image. When in a non-driving mode that does not implement, a specific pattern or image by external light can be implemented in the OLED standby screen state.

Therefore, a spatially natural feeling can be given by a specific pattern or image based on the image pattern implemented on the OLED standby screen, thereby realizing space utilization, interior design, and design effects.

As described above, according to the present invention, a polarizer for blocking external light is provided with a retardation plate that can selectively phase delay external light, and an image pattern is formed in a dead zone area that does not substantially emit light in the pixel area. , Through this, when the OLED is in a non-driving mode that does not display an image, a specific pattern or image by external light can be implemented in the standby screen state of the OLED.

Therefore, a spatially natural feeling can be given by a specific pattern or image based on the image pattern implemented on the OLED standby screen, thereby realizing space utilization, interior design, and design effects.

1 is a diagram schematically showing a cross section of a typical active matrix type OLED.
Figure 2 is a cross-sectional view schematically showing an OLED according to an embodiment of the present invention.
Figure 3 is a plan view schematically showing a pixel arrangement according to an embodiment of the present invention.
FIG. 4 is a diagram schematically showing the structure of the polarizing plate of FIG. 2.
5A to 5B are conceptual diagrams showing the process of external light in an OLED according to an embodiment of the present invention.
6A to 6C are photos schematically showing the standby screen when the OLED is in a non-driving mode according to an embodiment of the present invention.

The present invention includes a first substrate on which driving thin film transistors and light emitting diodes are formed for each pixel area; an image pattern located corresponding to a dead zone of the pixel area; It is located in the transmission direction of the light emitted from the light emitting diode, and includes a retardation plate including a liquid crystal layer and optionally having a 1/4λ phase retardation value, and a polarizing plate including a linear polarizer formed on the retardation plate, The retardation plate has a phase delay value of 1/4λ when in a driving mode in which light is emitted from the light emitting diode, and an organic light emitting device having a phase delay value of 0 when in a non-driving mode in which light is not emitted from the light emitting diode. provides.

At this time, the image pattern is made of a color filter material, and the retardation plate includes first and second films, and first and second transparent electrodes formed on the first and second films, respectively, and the first and second transparent electrodes are formed on the first and second films, respectively. The liquid crystal layer is interposed between the first and second transparent electrodes.

In addition, the liquid crystal layer is initially arranged in a vertical direction with respect to the first and second films, and when a vertical electric field is applied to the first and second transparent electrodes, the liquid crystal layer is arranged at 45 degrees to the polarization axis of the linear polarizer. do.

In addition, the retardation plate includes first and second films, and first and second transparent electrodes formed on one selected from the first and second films, and the liquid crystal layer is formed between the first and second films. interposed, and the liquid crystal layer is initially arranged in the same direction as the polarization axis of the linear polarizer.

At this time, when a horizontal electric field is applied to the first and second transparent electrodes, the liquid crystal layer is arranged at 45 degrees to the polarization axis of the linear polarizer, the image pattern is located on the second electrode of the light emitting diode, and the ratio When in drive mode, external light passes through the image pattern to create a pattern or image on the standby screen.

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

Figure 2 is a cross-sectional view schematically showing an OLED according to an embodiment of the present invention, and Figure 3 is a plan view schematically showing a pixel arrangement according to an embodiment of the present invention.

As shown in FIG. 2, the OLED 100 according to an embodiment of the present invention has a substrate 101 on which a driving thin film transistor (DTr) and a light emitting diode (E) are formed, and is encapsulated by a protective film 120. encapsulation).

Looking at this in more detail, a semiconductor layer 103 is formed in the pixel area (P) on the substrate 101. The semiconductor layer 103 is made of silicon, and its central portion is an active area 103a forming a channel and an active area. (103a) consists of source and drain regions (103b, 103c) doped with a high concentration of impurities on both sides.

A gate insulating film 105 is formed on the semiconductor layer 103.

On the top of the gate insulating film 105, a gate electrode 107 and a gate wiring extending in one direction (not shown in the drawing) are formed corresponding to the active area 103a of the semiconductor layer 103.

In addition, a first interlayer insulating film 109a is formed on the entire upper surface of the gate electrode 107 and the gate wiring (not shown). At this time, the first interlayer insulating film 109a and the gate insulating film 105 below it are formed in the active area ( 103a) First and second semiconductor layer contact holes 116 are provided to expose the source and drain regions 103b and 103c located on both sides, respectively.

Next, on the upper part of the first interlayer insulating film 109a including the first and second semiconductor layer contact holes 116, source and drain regions ( Source and drain electrodes 110a and 110b are formed in contact with 103b and 103c, respectively.

And, a second interlayer having a drain contact hole 117 exposing the drain electrode 110b to the top of the source and drain electrodes 110a and 110b and the first interlayer insulating film 109a exposed between the two electrodes 110a and 110b. An insulating film 109b is formed.

At this time, the semiconductor layer 103 including source and drain electrodes 110a and 110b and source and drain regions 103b and 103c in contact with these electrodes 110a and 110b, and a gate insulating film formed on the semiconductor layer 103. (105) and the gate electrode 107 form a driving thin film transistor (DTr).

Meanwhile, although not shown in the drawing, a data wire (not shown) is formed that intersects the gate wire (not shown) to define the pixel area (P), and the switching thin film transistor (not shown) is connected to the driving thin film transistor (DTr). It has the same structure and is connected to the driving thin film transistor (DTr).

In addition, the switching thin film transistor (not shown) and the driving thin film transistor (DTr) are shown as examples of a top gate type in which the semiconductor layer 103 is made of a polysilicon semiconductor layer or an oxide semiconductor layer, and variations thereof. For example, it may be formed as a bottom gate type made of pure and impurity amorphous silicon.

In addition, it is connected to the drain electrode 110b of the driving thin film transistor DTr, and in the area where the image is actually displayed above the second interlayer insulating film 109b, a light emitting diode (E ) A first electrode 111 forming the anode is formed.

This first electrode 111 is formed for each pixel area (P), and a bank (bank: 119) is located between the first electrodes 111 formed for each pixel area (P).

That is, the first electrode 111 is formed in a structure separated for each pixel area (P) with the bank 119 as a boundary for each pixel area (P).

And the organic light-emitting layer 113 is formed on the first electrode 111.

Here, the organic light-emitting layer 113 may be composed of a single layer made of a light-emitting material, and in order to increase light-emitting efficiency, a hole injection layer, a hole transport layer, an emitting material layer, and an electron layer may be formed. It may be composed of multiple layers of an electron transport layer and an electron injection layer.

In addition, a second electrode 115 forming a cathode is formed on the entire surface of the organic light emitting layer 113.

At this time, the second electrode 115 has a double-layer structure in which a transparent conductive material is thickly deposited on a translucent metal film in which a metal material with a low work function is thinly deposited.

Accordingly, the light emitted from the organic emission layer 113 is driven in a top emission manner to be emitted toward the second electrode 115.

When a predetermined voltage is applied to the first electrode 111 and the second electrode 115 according to a selected signal, the OLED 100 generates holes injected from the first electrode 111 and energy provided from the second electrode 115. Electrons are transported to the organic light-emitting layer 113 to form excitons, and when these excitons transition from the excited state to the ground state, light is generated and emitted in the form of visible light.

At this time, the emitted light passes through the transparent second electrode 115 and goes out, so the OLED 100 implements an arbitrary image.

Here, the OLED 100 according to an embodiment of the present invention has an image pattern 300 formed on the second electrode 115 in response to a dead zone (D) formed along the edge of the pixel area (P). It is characterized by being provided.

That is, as shown in FIG. 3, a plurality of pixel areas (SP), which are the basic units of image expression, are arranged in a matrix form, and each pixel area (SP) has R, G, and B organic thin film patterns (113a, 113b, 113c) is formed, emitting the colors R, G, and B.

Three pixel areas (SP), R, G, and B, form one pixel (pixel: P).

At this time, each organic thin film pattern (113a, 113b, 113c) emitting a different color is formed so that the boundary between the organic thin film pattern (113a, 113b, 113c) and the adjacent organic thin film pattern (113a, 113b, 113c) becomes ambiguous during the formation process. In order to prevent the shadowing effect, a certain distance must be maintained from each other.

At this time, in the present invention, as an example, the organic light emitting layer 113 implements different R, G, and B colors for each pixel area (SP), but the organic light emitting layer 113 may all implement the same white (W) color light. In this case, red (R), green (B), and blue (B) color filters may be further provided on the substrate 101 for each pixel area (SP).

At this time, the separation distance between the organic thin film patterns 113a, 113b, and 113c of each pixel region (SP) emitting different colors is an area that cannot be practically used as a light emitting portion and is called a dead zone (D).

The image pattern 300 according to an embodiment of the present invention is provided to correspond to the dead zone (D) of each pixel area (SP) that does not substantially emit light.

The image pattern 300 may be made of ink or color filter material of various colors, and may be made of the same color or different colors for each pixel area (SP). We will look at this in more detail later.

And, a protective film 120 in the form of a thin film is formed on the driving thin film transistor (DTr) and the light emitting diode (E), and the OLED (100) is encapsulated through the protective film (120). .

Here, the protective film 120 is used by stacking at least two inorganic protective films (120a) to prevent external oxygen and moisture from penetrating into the OLED (100). At this time, two inorganic protective films (120a) are used. ) It is preferable that an organic protective film (120b) is interposed between the two to supplement the impact resistance of the inorganic protective film (120a).

In this structure in which the organic protective film (120b) and the inorganic protective film (120a) are alternately laminated, the inorganic protective film (120a) must prevent moisture and oxygen from penetrating through the side of the organic protective film (120b). It is desirable to have a structure that completely surrounds the organic protective film 120b.

Accordingly, the OLED 100 can prevent moisture and oxygen from penetrating into the OLED 100 from the outside.

Through this, it is possible to prevent oxidation and corrosion of the electrode layer from occurring due to oxygen or moisture introduced inside, and thus the luminescence characteristics of the organic light-emitting layer 113 are reduced, and the lifespan of the organic light-emitting layer 113 is shortened. Problems can be prevented.

In addition, current leakage and short circuits can be prevented, and pixel defects can be prevented. This prevents problems caused by uneven brightness or image characteristics.

In addition, the OLED 100 according to an embodiment of the present invention is characterized in that a polarizer 200 is formed on the top of the protective film 120 to prevent a decrease in contrast due to external light.

That is, the OLED 100 improves contrast by forming a polarizer 200 that blocks external light incident from the outside in the transmission direction of light emitted through the organic light-emitting layer 113 when in a driving mode that produces an image. do.

The polarizing plate 200 is a circularly polarizing plate for blocking external light, and is composed of a retardation plate 210 (see FIG. 4) and a linear polarizing plate 220 (see FIG. 4) attached to the outer surface of the protective film 120.

At this time, the stacking order of the linear polarizer (220, see FIG. 4) and the retardation plate (210, see FIG. 4) is to arrange the linear polarizer (220, see FIG. 4) close to the incident direction of the external light, and place the retardation plate (210, see FIG. 4) inside it. A structure in which 210 (see FIG. 4) is arranged is preferable.

Here, the retardation plate 210 (see FIG. 4) according to an embodiment of the present invention has a 1/4λ phase delay value when driven, and has no phase delay value when not driven, that is, a liquid crystal with a phase delay value of 0. It is characterized by being made of panels.

Through this, the OLED 100 according to an embodiment of the present invention can selectively phase-delay external light through the retardation plate 210 (see FIG. 4) of the polarizer 200.

Therefore, in the driving mode that produces an image in the OLED (100), reflection of external light can be minimized to prevent a decrease in contrast, and in the non-driving mode that does not produce an image in the OLED (100), external light is used to prevent each contrast. A specific pattern or image is implemented in the standby screen state through the image pattern 300 formed in the dead zone (D) of the pixel area (SP).

The OLED 100 according to this embodiment of the present invention can provide a spatially natural feeling by a specific pattern or image by the image pattern 300 implemented on the standby screen of the OLED 100, thereby improving space utilization and interior design. and design effects can be realized.

FIG. 4 is a diagram schematically showing the structure of the polarizing plate of FIG. 2.

As shown, the polarizer 200 largely consists of a linear polarizer 220 and a retardation plate 210. The retardation plate 210 has a 1/4λ phase delay value when driven, and has a phase of 0 when not driven. It consists of a liquid crystal panel with a delay value.

Here, the linear polarizer 220 includes a polarizing layer 221 that changes the polarization characteristics of light, and first and second TAC films ( It consists of 223a, 223b).

In addition, a surface treatment layer (not shown) may be further included on one side of the second TAC film 223b. The surface treatment layer (not shown) is an anti-glare layer containing silica beads (not shown). -glare) layer or a hard coating layer to prevent damage to the surface of the polarizer 200.

The first and second TAC films 223a and 223b are made of tri-acetatecellulose and serve to maintain the stretched state of the polarizing layer 221.

In addition, the retardation plate 210 is located below the linear polarizer 220, where the first and second transparent films 211a and 211b are bonded to the retardation plate 210, and the liquid crystal layer 215 is formed between them. ) has a structure interposed.

A first transparent electrode 213a and a second transparent electrode 213b for driving the liquid crystal layer 215 are formed inside the first film 211a and the second film 211b, respectively. The first and second transparent electrodes 213a and 213b may be made of indium-tin-oxide (ITO) or indium-zinc-oxide (IZO), which are transparent conductive materials.

This retardation plate 210 causes light to pass through the liquid crystal layer 215 and generate a phase difference due to the optical anisotropy of the liquid crystal.

That is, in the initial state, the liquid crystal layer 215 remains aligned in a vertical direction with respect to the first and second films 211a and 211b. And when a vertical electric field is applied to the first transparent electrode 213a and the second transparent electrode 213b, the liquid crystal layer 215 is horizontal to the first and second films 211a and 211b according to the electric field direction. The arrangement state changes, and at this time, the liquid crystal layer 215 is arranged at 45 degrees to the polarization axis of the linear polarizer 220.

That is, the liquid crystal layer 215 of the retardation plate 210 according to an embodiment of the present invention allows light passing through the liquid crystal layer 215 to have a phase delay value of 1/4λ.

As such, the liquid crystal layer 215 that operates by a vertical electric field is preferably a liquid crystal in a vertical alignment (VA) mode, an electrically controlled birefringence (ECB) mode, or an optically compensated bend (OCB) mode.

Through this, the OLED of the present invention (100 in FIG. 2) can selectively phase delay external light.

Therefore, in the driving mode in which an image is displayed on the OLED (100 in Figure 2), the reflection of external light can be minimized to prevent a decrease in contrast, and in the non-driving mode in which the image is not displayed in the OLED (100 in Figure 2) A pattern or image specific to the standby screen state is implemented through an image pattern (300 in FIG. 3) formed in the dead zone (D in FIG. 3) of each pixel area (SP in FIG. 2) using external light.

And, an adhesive layer 230 is provided at the bottom of the polarizer 200 to attach the polarizer 200 to the OLED (100 in FIG. 2), and a separate protective layer (not shown) is included at the bottom of the adhesive layer 230. You can.

The protective layer (not shown) is detached during the attachment process of the polarizer 200 to expose the adhesive layer 230, and serves to protect the adhesive layer 230 from contamination during transportation and transport.

Here, the polarizing plate 200 of the present invention eliminates the first TAC film 223a of the linear polarizing plate 220, and the second film 221b of the retardation plate 210 plays the role of the first TAC film 223a. It is also possible to form them to work together.

As described above, the OLED (100 in FIG. 2) according to an embodiment of the present invention is formed so that the retardation plate 210 of the polarizer 200 for blocking external light reflection includes the liquid crystal layer 215, thereby selectively blocking external light. Since the light can be phase-delayed, the reflection of external light can be minimized in the driving mode to produce an image in OLED (100 in Figure 2), preventing a decrease in contrast, and also the image in OLED (100 in Figure 2) can be prevented. In the non-driving mode, which is not implemented, an image pattern (300 in FIG. 3) formed in the dead zone (D in FIG. 3) of each pixel area (SP in FIG. 3) using external light is used to create a specific pattern or pattern in the standby screen state. The image is realized.

The OLED (100 in FIG. 2) according to this embodiment of the present invention provides a spatially natural feeling by a specific pattern or image by the image pattern (300 in FIG. 3) implemented on the standby screen of the OLED (100 in FIG. 2). This allows space utilization, interior design, and design effects to be realized.

Here, we will look in more detail at the principle of selectively phase delaying external light with reference to FIGS. 5A to 5B.

5A to 5B are conceptual diagrams showing the process of external light in an OLED according to an embodiment of the present invention.

As shown in FIG. 5A, when in a driving mode in which an image is realized from an OLED (100 in FIG. 2), unpolarized first light (A) is incident from the outside. ) is modulated into the second light B having a first linear polarization state of the same polarization component as the polarization axis of the linear polarization plate 220 in the process of passing through the linear polarization plate 220 of the polarizer 200.

Then, the second light B passes through the retardation plate 210 located below the linear polarizer 220, and at this time, the first and second transparent electrodes (213a and 213b in FIG. 4) of the retardation plate 210 ), a vertical electric field is applied, and the liquid crystal layer (215 in FIG. 4) is arranged at 45 degrees to the polarization axis of the linear polarizer 220 with respect to the first and second films (211a and 211b in FIG. 4) according to the electric field direction. changes.

Accordingly, the second light B having the first linear polarization state is delayed by 1/4λ in the process of passing through the retardation plate 210, and the third light B having the first circular polarization state corresponding to the first linear polarization state is delayed by 1/4λ. It is modulated with light (C).

The first circular polarization state may be a left circular polarization state.

The third light (C) in the first circularly polarized state is reflected by the first electrode (111 in FIG. 2) of the light emitting diode (E) formed on the substrate 101. At this time, the first circular polarization is caused by this surface reflection. It is modulated into the fourth light D having a second circular polarization state different from the polarization state.

The second circular polarization state may be a right-circular polarization state.

The fourth light (D) passes through the retardation plate 210 again and is modulated into the fifth light (E) having a second linearly polarized state corresponding to the second circularly polarized state, and the second linearly polarized state is transmitted to the linearly polarized plate (220). ) has a polarization component perpendicular to the polarization axis.

Accordingly, the fifth light E in the second linearly polarized state does not pass through the linearly polarizing plate 220 and is absorbed and blocked by the linearly polarizing plate 220, so that it is not emitted to the outside of the linearly polarizing plate 220.

Accordingly, external light reflection is minimized and contrast is further improved.

And, referring to FIG. 5b, when the OLED (100 in FIG. 2) is in a non-driving mode in which an image is not implemented, when the first light A in a non-polarized state is incident from the outside, the first light in a non-polarized state is (A) is modulated into second light (B) having a first linear polarization state of the same polarization component as the polarization axis of the linear polarization plate 220 in the process of passing through the linear polarization plate 220 of the polarizer 200.

And, the second light (B) passes through the retardation plate 210 located below the linear polarizer 220. At this time, the electric field is not applied to the retardation plate 210, so the liquid crystal layer (215 in FIG. 4) ) remains aligned in the vertical direction with respect to the first and second films (211a and 211b in FIG. 4) in their initial arrangement.

Therefore, the second light B having the first linear polarization state passes through the retardation plate 210 as is, and is reflected by the first electrode (111 in FIG. 2) of the light emitting diode E on the substrate 101. do.

At this time, the second light (B) having the first linear polarization state is reflected from the surface while maintaining the first linear polarization state, and the second light (B) having the first linear polarization state is reflected through the retardation plate 210 as is. passes again.

Since the second light (B) having the first linear polarization state that has passed through the retardation plate 210 has the same polarization component as the polarization axis of the linear polarizer 220, it also passes through the linear polarizer 220 as is and appears in the OLED (Figure 2). It shines outside of 2 (100).

At this time, the second light (B) having the first linear polarization state reflected by the first electrode (111 in FIG. 2) of the light-emitting diode (E) is reflected by the second electrode (115 in FIG. 2) of the light-emitting diode (E). In the process of passing the image pattern 300 formed on the image pattern 300, color is implemented by the image pattern 300.

Accordingly, a specific pattern or image is implemented by the image pattern 300 outside the OLED (100 in FIG. 2).

That is, when the OLED (100 in FIG. 2) is in a non-driving mode that does not display an image, it is in a standby screen state where only black or white is displayed. The OLED (100 in FIG. 2) according to an embodiment of the present invention is When in non-driving mode, a specific pattern or image by the image pattern 300 using external light is implemented in the standby screen state of the OLED (100 in FIG. 2).

The OLED (100 in FIG. 2) according to this embodiment of the present invention can provide a spatially natural feeling by a specific pattern or image based on the image pattern implemented on the standby screen of the OLED (100 in FIG. 2), thereby improving space utilization. Castle, interior and design effects can be realized.

Figures 6a to 6c are photographs schematically showing the standby screen when the OLED is in a non-driving mode according to an embodiment of the present invention.

As shown in FIG. 6A, when the OLED (100 in FIG. 2) according to an embodiment of the present invention is in a non-driving mode in which an image is not displayed, the OLED (100 in FIG. 2) is displayed on the standby screen of the OLED (100 in FIG. 2). 100) can be implemented to have a color realized in the process of passing the external light incident inside the image pattern (300 in FIG. 5b).

Additionally, by forming or not forming an image pattern (300 in FIG. 5B) for each pixel area (SP in FIG. 3), various patterns or images can be implemented, as shown in FIGS. 6B and 6C.

As described above, the OLED (100 in FIG. 2) according to an embodiment of the present invention includes a polarizer (200 in FIG. 5b) for blocking external light and a retardation plate (210 in FIG. 5b) that can selectively phase delay external light. ), and by forming an image pattern (300 in FIG. 5B) in a dead zone (D in FIG. 3) that does not substantially emit light in the pixel area (SP in FIG. 3), the OLED (100 in FIG. 2) produces an image When in a non-driving mode that does not implement, a specific pattern or image by external light can be implemented in the standby screen state of the OLED (100 in FIG. 2).

Therefore, the OLED (100 in FIG. 2) according to an embodiment of the present invention can give a spatially natural feeling by a specific pattern or image based on the image pattern implemented on the standby screen of the OLED (100 in FIG. 2), Utility, interior design and design effects can be realized.

Meanwhile, in the description and drawings so far, the configuration of the liquid crystal layer (215 in FIG. 4) of the retardation plate (210 in FIG. 5B) of the polarizer (200 in FIG. 5B) according to the embodiment of the present invention is only in the vertical electric field mode. Although described and shown, the retardation plate (210 in FIG. 5b) is a horizontal electric field mode in which both the first and second transparent electrodes (213a and 213b in FIG. 4) are formed on one film (211a and 211b in FIG. 4). It can also be implemented as, where the liquid crystal layer (215 in FIG. 4) is initially arranged in the same direction as the polarization axis of the linear polarizer (220 in FIG. 5b), and then when a horizontal electric field is applied, the liquid crystal layer (215 in FIG. 4) is By arranging the polarization axis of the linear polarizer (220 in FIG. 5B) at 45 degrees, the light passing through the liquid crystal layer (215 in FIG. 4) can be formed to have a phase delay value of 1/4λ.

The present invention is not limited to the above embodiments, and can be implemented with various changes without departing from the spirit of the present invention.

101: substrate
200: Polarizer (210: Retardation plate, 220: Linear polarizer)
300: Image pattern

Claims (12)

A substrate including a plurality of pixel areas;
Located in each of the plurality of pixel areas, comprising a first electrode located on top of the substrate, a second electrode located on top of the first electrode, and an organic light emitting layer located between the first electrode and the second electrode. a light emitting diode;
an image pattern located corresponding to a dead zone of the pixel area;
It is located in the transmission direction of the light emitted from the light emitting diode, includes a liquid crystal layer, has a 1/4λ phase delay value when in a driving mode in which light is emitted from the light emitting diode, and does not emit light from the light emitting diode. A retardation plate having a phase delay value of 0 when in non-driving mode;
It is located above the retardation plate and includes a polarizing plate including a linear polarizing plate,
The image pattern is made of a color filter material,
The image pattern is located directly above the second electrode and is in contact with the second electrode, and further includes a driving thin film transistor located in each of the plurality of pixel areas,
An organic light emitting display panel wherein the image pattern is positioned to correspond to the driving thin film transistor.

delete According to claim 1,
The retardation plate includes first and second films, and first and second transparent electrodes formed on the first and second films, respectively, and the liquid crystal layer is interposed between the first and second transparent electrodes. Organic light emitting display panel.
According to claim 3,
An organic light emitting display panel wherein the liquid crystal layer is initially arranged in a vertical direction with respect to the first and second films.
According to claim 4,
When a vertical electric field is applied to the first and second transparent electrodes, the liquid crystal layer is arranged at 45 degrees to the polarization axis of the linear polarizer.
According to claim 1,
The retardation plate includes first and second films, and first and second transparent electrodes formed on one of the first and second films, and the liquid crystal layer is interposed between the first and second films. Organic light emitting display panel.
According to claim 6,
An organic light emitting display panel wherein the liquid crystal layer is initially arranged in the same direction as the polarization axis of the linear polarizer.
According to claim 7,
When a horizontal electric field is applied to the first and second transparent electrodes, the liquid crystal layer is arranged at 45 degrees to the polarization axis of the linear polarizer.
delete According to claim 1,
An organic light emitting display panel that, when in the non-driving mode, external light passes through the image pattern to create a pattern or image on the standby screen. delete delete