KR20100068074A - Organic light emitting devicce - Google Patents

Abstract

PURPOSE: An organic light emitting device is provided to suppress the reflection of external light by arranging a polarizer or a neutral density filter on the entire surface of a white pixel. CONSTITUTION: A plurality of thin film transistors(110) is located on a first substrate. A first electrode(191) is located on the thin film transistors. A second electrode(270) opposes the first electrode. A light-emitting layer(370) is located between the first electrode and the second electrode. An optical unit(12) uses a polarizer or a neutral density filter which are arranged on the entire surface of a white pixel.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DEVICCE}

The present invention relates to an organic light emitting display device.

In general, an active flat panel display includes a plurality of pixels for displaying an image, and displays the image by controlling luminance of each pixel according to given display information. Among them, the organic light emitting diode display has been spotlighted as a next-generation display device that will surpass the liquid crystal display due to its self-emission type, low power consumption, wide viewing angle, and fast pixel response speed.

The organic light emitting diode display includes an organic light emitting element, that is, two electrodes and an emission layer positioned between them, and an exciton generated by combining electrons and holes injected from the two electrodes into the emission layer. Is a display device that emits light when it falls from the excited state to the ground state.

The organic light emitting diode display includes a plurality of pixels such as a red pixel, a blue pixel, and a green pixel, and the pixels may be combined to represent full color.

In this case, the red pixel, the blue pixel, and the green pixel may each represent a color by including a red light emitting layer, a blue light emitting layer, and a green light emitting layer. The light emitting layer may be deposited for each pixel using a fine shadow mask. However, as the display device becomes larger, there is a limit in depositing an emission layer for each pixel using a fine shadow mask.

The problem to be solved by the present invention is to improve the light contrast ratio of the organic light emitting display device and the light utilization efficiency of the display device.

The organic light emitting diode display according to the exemplary embodiment of the present invention includes a first pixel, a second pixel, a third pixel, and a fourth pixel displaying different colors, and each pixel is positioned on the first substrate and the first substrate. A plurality of thin film transistors, a first electrode positioned on the thin film transistor, a second electrode facing the first electrode, and a light emitting layer positioned between the first electrode and the second electrode, the main portion corresponding to the fourth pixel. The optical member is arrange | positioned.

The first pixel may be a red pixel, the second pixel may be a blue pixel, the third pixel may be a green pixel, and the fourth pixel may be a white pixel.

The light emitting layer may emit white light.

The light emitting layer can emit light in the thin film transistor direction.

The first pixel, the second pixel, and the third pixel may further include a color filter formed between the first electrode and the thin film transistor.

The main optical member may be disposed under the first substrate.

An auxiliary optical member may be further disposed below the first substrate to be disposed in a portion corresponding to the thin film transistors of the first pixel, the second pixel, and the third pixel.

The main optical member and the auxiliary optical member may be polarizing plates.

The primary and secondary optical members may be neutral concentration filters.

The main optical member may be disposed between the thin film transistor corresponding to the fourth pixel and the first substrate.

And an auxiliary optical member disposed between the first substrate and the thin film transistors of the first pixel, the second pixel, and the third pixel, wherein the auxiliary optical member is disposed in the thin film transistors of the first pixel, the second pixel, and the third pixel. It may be arranged in a corresponding portion.

Each of the first pixel, the second pixel, and the third pixel may further include a color filter formed under the thin film transistor, and the fourth pixel may further include an insulating film formed under the thin film transistor.

The light emitting layer may emit light in a direction opposite to the thin film transistor.

The first pixel, the second pixel, the third pixel, and the fourth pixel are each formed on the second electrode, and further include a second substrate having a first surface facing the second electrode and a second surface opposite to the second electrode. In addition, a color filter may be formed on the first surface of the second substrate of the first pixel, the second pixel, and the third pixel, and an insulating film may be formed on the first surface of the second substrate of the fourth pixel.

The main optical member may be disposed on the second surface of the second substrate corresponding to the fourth pixel.

The main optical member may be disposed between the insulating film corresponding to the fourth pixel and the first surface of the second substrate.

According to the embodiment of the present invention, by using the white pixel, the efficiency of the display device can be improved, and the reflection of external light can be suppressed by arranging a polarizing plate or a neutral density filter in front of the white pixel. The fall can be prevented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

1 is an equivalent circuit diagram of an organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an organic light emitting diode display according to an exemplary embodiment of the present invention includes a plurality of signal lines 121, 171, and 172, and a plurality of pixels connected to the plurality of signal lines 121, 171, and 172 and arranged in a substantially matrix form. (PX).

The signal line includes a plurality of gate lines 121 for transmitting a gate signal (or scan signal), a plurality of data lines 171 for transmitting a data signal, and a plurality of driving voltage lines for transmitting a driving voltage. and a driving voltage line 172. The gate lines 121 extend substantially in the row direction, and are substantially parallel to each other, and the data line 171 and the driving voltage line 172 extend substantially in the column direction, and are substantially parallel to each other.

Each pixel PX includes a switching transistor Qs, a driving transistor Qd, a storage capacitor Cst, and an organic light emitting element. The organic light emitting diode serves as an organic light emitting diode (OLED) LD.

The switching transistor Qs has a control terminal, an input terminal, and an output terminal. The control terminal is connected to the gate line 121, and the input terminal is a data line 171. ) And the output terminal is connected to the driving transistor Qd. The switching transistor Qs transfers the data signal received from the data line 171 to the driving transistor Qd in response to the scan signal received from the gate line 121.

The driving transistor Qd also has a control terminal, an input terminal and an output terminal, the control terminal is connected to the switching transistor Qs, the input terminal is connected to the driving voltage line 172, and the output terminal is organic light emitting. It is connected to the device. The driving transistor Qd flows an output current ILD whose magnitude varies depending on the voltage applied between the control terminal and the output terminal.

The capacitor Cst is connected between the control terminal and the input terminal of the driving transistor Qd. The capacitor Cst charges the data signal applied to the control terminal of the driving transistor Qd and maintains it even after the switching transistor Qs is turned off.

The organic light emitting diode has an anode connected to the output terminal of the driving transistor Qd and a cathode connected to the common voltage Vss. The organic light emitting diode displays an image by emitting light at different intensities according to the output current ILD of the driving transistor Qd.

The switching transistor Qs and the driving transistor Qd are n-channel field effect transistors (FETs). However, at least one of the switching transistor Qs and the driving transistor Qd may be a p-channel field effect transistor or a thin film transistor using amorphous silicon as a semiconductor. In addition, the connection relationship between the transistors Qs and Qd, the capacitor Cst, and the organic light emitting diode may be changed.

2 is a schematic diagram illustrating a plurality of pixel arrangements in an organic light emitting diode display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a red pixel R displaying red, a green pixel G displaying green, a blue pixel B displaying blue, and a white pixel W are alternately disposed. For example, four pixels including a red pixel R, a green pixel G, a blue pixel B, and a white pixel W may be repeated in rows and / or columns in a group. However, the arrangement of the pixels may be variously modified. As described above, the organic light emitting diode display further includes a white pixel W in addition to the red pixel R, the green pixel G, and the blue pixel B, thereby improving luminance.

<First Embodiment>

Next, a structure of an organic light emitting diode display according to a first exemplary embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 is a schematic diagram illustrating an arrangement of an optical member in an organic light emitting diode display according to a first exemplary embodiment of the present invention, and FIG. 4 is a cross-sectional view of the organic light emitting diode display according to the first exemplary embodiment of the present invention.

Referring to FIG. 3, the optical member 12 is disposed in front of the white pixel W, and is further disposed in the thin film transistors Qs and Qd of the red pixel R, the green pixel G, and the blue pixel B. It is arranged only in the corresponding part.

Next, a detailed structure of the organic light emitting diode display illustrated in FIG. 3 will be described with reference to FIG. 4.

A plurality of thin film transistor arrays are arranged on the insulating substrate 110. The thin film transistor array includes a switching thin film transistor Qs and a driving thin film transistor Qd which are disposed for each pixel, and are electrically connected to each other.

The first insulating layer 112 is formed on the thin film transistor arrays Qs and Qd. A plurality of contact holes (not shown) are formed in the first insulating layer 112 to expose part of the switching thin film transistor Qs and the driving thin film transistor Qd.

The red filter 230R is formed on the red pixel, the green filter 230G is formed on the green pixel, and the blue filter 230B is formed on the blue pixel, and the color filter is not formed on the white pixel W. Or a white filter (not shown) made of a transparent material can be formed.

The second insulating layer 180 is formed on the color filters 230R, 230G, and 230B and the first insulating layer 112. A plurality of contact holes (not shown) are formed in the second insulating layer 180.

The pixel electrode 191 is formed on the second insulating layer 180. The pixel electrode 191 is electrically connected to the driving thin film transistor Qd through a contact hole (not shown), and may serve as an anode. The pixel electrode 191 may be made of a transparent conductor such as ITO or IZO. A pixel defining layer such as a partition wall may be formed between the pixel electrode 191 and the pixel electrode 191.

An organic light emitting member is formed on the pixel electrode 191.

The organic light emitting member may include a light emitting layer 370 that emits light and an auxiliary layer (not shown) for improving light emission efficiency of the light emitting layer 370.

The light emitting layer 370 may sequentially stack materials that uniquely emit light such as red, green, and blue to form a plurality of sub light emitting layers (not shown), and combine the colors thereof to emit white light. In this case, the sub light emitting layer is not limited to being formed vertically, but may be formed horizontally. If the combination is capable of emitting white light, the sub light emitting layer is not limited to red, green and blue, and may be formed in various color combinations.

On the other hand, the organic light emitting member may be disposed separately for each pixel, in which case the light emitting layer emitting red light in the red pixel (R), the light emitting layer emitting green light in the green pixel (G) and the light emitting layer emitting blue light in the blue pixel (B). It may include.

The auxiliary layer may be at least one selected from an electron transport layer, a hole transport layer, an electron injection layer, and a hole injection layer.

The common electrode 270 is formed on the organic light emitting member. The common electrode 270 may be made of a metal having high reflectance as a reflective member and serve as a cathode. In addition, the common electrode 270 is formed on the entire surface of the substrate 110, and pairs with the pixel electrode 191 serving as an anode to send a current to the organic light emitting member.

An optical member 12 is formed under the insulating substrate 110.

The optical member 12 is disposed in front of the white pixel W. In the red pixel R, the green pixel G, and the blue pixel B, only the portion corresponding to each of the thin film transistors Qs and Qd is provided. It is arranged.

The optical member 12 transmits a part of light, and may use a polarizing plate or a neutral density filter.

The polarizing plate may be formed in a film form or a form in which metal lines are arranged at regular intervals.

Neutral concentration filter controls the transmittance of light. For example, when a neutral concentration filter having a transmittance of 50% is used, light from the outside passes through the neutral concentration filter, and 50% is absorbed, so that only 50% is inside the display device. Enter Subsequently, it is reflected by the metal inside the display device and passes through the neutral concentration filter again, at which time 50% is also absorbed. Thus, only 25% of the light coming from outside is reflected. Such a neutral concentration filter may be made of an organic material or a multilayered form of a metal.

Second Embodiment

Next, another embodiment of the present invention will be described with reference to FIGS. 5 to 9.

5 is a cross-sectional view of an organic light emitting device according to a second exemplary embodiment of the present invention.

Referring to FIG. 5, the configuration of the second embodiment is substantially the same as that of the first embodiment shown in FIG. 4, but the positions at which the color filters 230R, 230G, and 230B are formed are different from each other.

That is, a red filter 230R is formed on a red pixel on the insulating substrate 110, a green filter 230G is formed on a green pixel, and a blue filter 230B is formed on a blue pixel, and a color filter is formed on the white pixel W. White filters (not shown) may be formed that are not formed or are made of a transparent material. The second insulating layer 180 is formed on the color filters 230R, 230G, and 230B.

A plurality of thin film transistor arrays is arranged on the second insulating layer 180. The thin film transistor array includes a switching thin film transistor Qs and a driving thin film transistor Qd disposed for each pixel, and are electrically connected to each other.

The first insulating layer 112 is formed on the thin film transistor arrays Qs and Qd. A plurality of contact holes (not shown) are formed in the first insulating layer 112 to expose part of the switching thin film transistor Qs and the driving thin film transistor Qd.

The pixel electrode 191 is formed on the second insulating layer 180. The pixel electrode 191 is electrically connected to the driving thin film transistor Qd through a contact hole (not shown), and may serve as an anode. The pixel electrode 191 may be made of a transparent conductor such as ITO or IZO.

The subsequent configuration is the same as that of the first embodiment shown in FIG.

Third Embodiment

6 is a cross-sectional view of an organic light emitting device according to a third embodiment of the present invention.

Referring to FIG. 6, the configuration of the third embodiment is substantially the same as that of the first embodiment shown in FIG. 4, but the positions at which the optical member 12 is formed are different from each other.

That is, the optical member 12 is formed on the insulating substrate 110. The optical member 12 is disposed in front of the white pixel W. In the red pixel R, the green pixel G, and the blue pixel B, only the portion corresponding to each of the thin film transistors Qs and Qd is provided. It is arranged.

In addition, the third insulating layer 111 may be formed in the remaining portions of the red pixel R, the green pixel G, and the blue pixel B except for the portions corresponding to the thin film transistors Qs and Qd. Formed.

A plurality of thin film transistor arrays are arranged on the optical member 12 and the third insulating layer 111. The thin film transistor array includes a switching thin film transistor Qs and a driving thin film transistor Qd which are disposed for each pixel, and are electrically connected to each other.

The first insulating layer 112 is formed on the thin film transistor arrays Qs and Qd. A plurality of contact holes (not shown) are formed in the first insulating layer 112 to expose part of the switching thin film transistor Qs and the driving thin film transistor Qd.

The subsequent configuration is the same as that of the first embodiment shown in FIG.

<Fourth Embodiment>

7 is a cross-sectional view of an organic light emitting device according to a fourth embodiment of the present invention.

Referring to FIG. 7, the configuration of the fourth embodiment is substantially the same as that of the second embodiment shown in FIG. 5, but the positions at which the optical member 12 is formed are different from each other.

That is, a red filter 230R is formed on a red pixel on the insulating substrate 110, a green filter 230G is formed on a green pixel, and a blue filter 230B is formed on a blue pixel, and a color filter is formed on the white pixel W. White filters (not shown) may be formed that are not formed or are made of a transparent material. The second insulating layer 180 is formed on the color filters 230R, 230G, and 230B.

The optical member 12 and the third insulating layer 111 are formed on the second insulating layer 180.

The optical member 12 is disposed in front of the white pixel W. In the red pixel R, the green pixel G, and the blue pixel B, only the portion corresponding to each of the thin film transistors Qs and Qd is provided. It is arranged.

The third insulating layer 111 is formed in the remaining portions of the red pixel R, the green pixel G, and the blue pixel B except for the portions corresponding to the thin film transistors Qs and Qd to remove the step difference. have.

A plurality of thin film transistor arrays are arranged on the optical member 12 and the third insulating layer 111. The thin film transistor array includes a switching thin film transistor Qs and a driving thin film transistor Qd which are disposed for each pixel, and are electrically connected to each other.

The first insulating layer 112 is formed on the thin film transistor arrays Qs and Qd. A plurality of contact holes (not shown) are formed in the first insulating layer 112 to expose part of the switching thin film transistor Qs and the driving thin film transistor Qd.

Here, the optical member 12 may be formed under the color filters 230R, 230G, and 230B and the second insulating layer 180.

The subsequent configuration is the same as that of the second embodiment shown in FIG.

As described above, according to the first to fourth embodiments of the present invention, the optical member 12 using a polarizing plate or a neutral density filter on the entire surface of the white pixel W that does not include a colored color filter capable of absorbing external light. ) Can be suppressed from reflection of external light, thereby reducing the contrast ratio.

In addition, an optical member 12 is also formed in a portion corresponding to each of the thin film transistors Qs and Qd in the red pixel R, the green pixel G, and the blue pixel B to form the thin film transistors Qs and Qd. It is possible to suppress reflection by the external light, and to prevent the external light from affecting the thin film transistors Qs and Qd.

<Fifth Embodiment>

8 is a cross-sectional view of an organic light emitting device according to a fifth embodiment of the present invention.

Referring to FIG. 8, most of the components of the fifth embodiment are substantially the same as the first embodiment shown in FIG. However, the first embodiment is an organic light emitting display device using the bottom emission method, while the fifth embodiment is an organic light emitting display device using the top emission method.

Referring back to FIG. 8, a plurality of thin film transistor arrays are arranged on the insulating substrate 110. The thin film transistor array includes a switching thin film transistor Qs and a driving thin film transistor Qd which are disposed for each pixel, and are electrically connected to each other.

The first insulating layer 112 is formed on the thin film transistor arrays Qs and Qd. A plurality of contact holes (not shown) are formed in the first insulating layer 112 to expose part of the switching thin film transistor Qs and the driving thin film transistor Qd.

The first insulating layer 112 and the pixel electrode 191 are formed. The pixel electrode 191 is electrically connected to the driving thin film transistor Qd through a contact hole (not shown), and may serve as an anode. The pixel electrode 191 may be made of a metal having high reflectance.

An organic light emitting member is formed on the pixel electrode 191.

The organic light emitting member may include a light emitting layer 370 that emits light and an auxiliary layer (not shown) for improving light emission efficiency of the light emitting layer 370.

The light emitting layer 370 may sequentially stack materials that uniquely emit light such as red, green, and blue to form a plurality of sub light emitting layers (not shown), and combine the colors thereof to emit white light. In this case, the sub light emitting layer is not limited to being formed vertically, but may be formed horizontally. If the combination is capable of emitting white light, the sub light emitting layer is not limited to red, green and blue, and may be formed in various color combinations.

On the other hand, the organic light emitting member may be disposed separately for each pixel, in which case the light emitting layer emitting red light in the red pixel (R), the light emitting layer emitting green light in the green pixel (G) and the light emitting layer emitting blue light in the blue pixel (B). It may include.

The auxiliary layer may be at least one selected from an electron transport layer, a hole transport layer, an electron injection layer, and a hole injection layer.

The common electrode 270 is formed on the organic light emitting member. The common electrode 270 may be made of a transparent conductor such as ITO or IZO and serve as a cathode. The common electrode 270 is formed on the entire surface of the substrate 110, and pairs with the pixel electrode 191 serving as an anode to flow a current through the organic light emitting member.

The encapsulation substrate 210 is disposed on the common electrode 270. The encapsulation substrate 210 may encapsulate the organic light emitting member and the common electrode 270 to prevent moisture or oxygen from penetrating from the outside.

The color filters 230R, 230G, and 230B and the second insulating layer 180 are formed on the encapsulation substrate 210.

A red filter 230R is formed on the red pixel, a green filter 230G is formed on the green pixel, and a blue filter 230B is formed on the blue pixel, and the white filter W is not formed of a color filter or is made of a transparent material. (Not shown) may be formed. The color filters 230R, 230G, 230B face the common electrode 270.

An optical member 22 is formed on the opposite side of the sealing substrate 210 on which the color filters 230R, 230G, 230B are formed. The optical member 22 is formed only on the entire surface of the white pixel W.

Sixth Example

9 is a cross-sectional view of an organic light emitting device according to a sixth embodiment of the present invention.

Referring to FIG. 9, the configuration of the sixth embodiment is substantially the same as that of the fifth embodiment shown in FIG. 8, but the positions at which the optical members 22 are formed are different from each other.

That is, the optical member 22 is formed only in the white pixel W portion between the encapsulation substrate 210 and the second insulating layer 180. A third insulating film 211 is formed between the color filters 230R, 230G, and 230B and the sealing substrate 210 to eliminate the step difference.

The rest of the configuration is the same as in the fifth embodiment shown in FIG.

As described above, according to the fifth and sixth exemplary embodiments of the present invention, the optical member 22 using a polarizing plate or a neutral density filter on the entire surface of the white pixel W that does not include a colored color filter capable of absorbing external light. ) Can be suppressed from reflection of external light, thereby reducing the contrast ratio.

10A is a graph illustrating reflectance of each of red, green, and blue pixels with respect to external light of an organic light emitting diode display according to an exemplary embodiment of the present invention, and FIG. 10B is external light of the organic light emitting diode display according to an exemplary embodiment of the present invention. A graph showing the integrated reflectance of red, green and blue pixels for.

10A and 10B, the reflectance of the green pixel and the blue pixel with respect to the external light is within 10%, and the reflectance of the red pixel with the external light is within 20%, and the red and green light with respect to the external light. And the integrated reflectivity of the blue pixel is within 10% on average, it can be seen that the contrast ratio is good.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is an equivalent circuit diagram of an organic light emitting diode display according to an exemplary embodiment of the present invention.

2 is a schematic diagram illustrating a plurality of pixel arrangements in an organic light emitting diode display according to an exemplary embodiment of the present invention.

3 is a schematic diagram illustrating an arrangement of an optical member in an organic light emitting diode display according to a first exemplary embodiment of the present invention.

4 is a cross-sectional view of an organic light emitting diode display according to a first exemplary embodiment of the present invention.

5 is a cross-sectional view of an organic light emitting diode display according to a second exemplary embodiment of the present invention.

6 is a cross-sectional view of an organic light emitting diode display according to a third exemplary embodiment of the present invention.

7 is a cross-sectional view of an organic light emitting diode display according to a fourth exemplary embodiment of the present invention.

8 is a cross-sectional view of an organic light emitting diode display according to a fifth exemplary embodiment of the present invention.

9 is a cross-sectional view of an organic light emitting diode display according to a sixth exemplary embodiment of the present invention.

10A is a graph illustrating reflectance of each of red, green, and blue pixels with respect to external light of an organic light emitting diode display according to an exemplary embodiment of the present invention.

10B is a graph illustrating integrated reflectance of red, green, and blue pixels with respect to external light of the organic light emitting diode display according to the exemplary embodiment of the present invention.

<Description of Main Reference Signs>

110, 210: substrate 112, 180: insulating film

121: gate line 171: data line

172: driving voltage line 191: pixel electrode

230R, 230G, 230B: color filter 270: common electrode

370 light emitting layer Qs: switching transistor

Qd: driving transistor LD: organic light emitting diode

Vss: Common Voltage Cst: Holding Capacitor

Claims (30)

In an organic light emitting display device including a first pixel, a second pixel, a third pixel, and a fourth pixel displaying different colors, Each pixel is First substrate, A plurality of thin film transistors positioned on the first substrate, A first electrode on the thin film transistor, A second electrode facing the first electrode, and A light emitting layer disposed between the first electrode and the second electrode, And a main optical member disposed in a corresponding portion of the fourth pixel. In claim 1, The first pixel is a red pixel, the second pixel is a blue pixel, the third pixel is a green pixel, and the fourth pixel is a white pixel. In claim 2, The light emitting layer emits white light. 4. The method of claim 3, The light emitting layer emits light toward the thin film transistor. In claim 4, The first pixel, the second pixel, and the third pixel further include a color filter formed between the first electrode and the thin film transistor. In claim 5, The main optical member is disposed under the first substrate. In claim 6, And an auxiliary optical member disposed under the first substrate in portions corresponding to the thin film transistors of the first pixel, the second pixel, and the third pixel. In claim 7, And the main optical member and the auxiliary optical member are polarizing plates. In claim 7, And the main optical member and the auxiliary optical member are neutral concentration filters. In claim 5, And the main optical member is disposed between the thin film transistor corresponding to the fourth pixel and the first substrate. In claim 10, An auxiliary optical member disposed between the first substrate and the thin film transistors of the first pixel, the second pixel, and the third pixel; The auxiliary optical member is disposed in a portion of the first pixel, the second pixel, and the third pixel corresponding to the thin film transistor. In claim 11, And the main optical member and the auxiliary optical member are polarizing plates. In claim 11, And the main optical member and the auxiliary optical member are neutral concentration filters. In claim 4, Each of the first pixel, the second pixel, and the third pixel further includes a color filter formed under the thin film transistor. The fourth pixel further includes an insulating layer formed under the thin film transistor. The method of claim 14, The main optical member is disposed under the first substrate. 16. The method of claim 15, And an auxiliary optical member disposed under the first substrate in portions corresponding to the thin film transistors of the first pixel, the second pixel, and the third pixel. The method of claim 16, And the main optical member and the auxiliary optical member are polarizing plates. The method of claim 17, And the main optical member and the auxiliary optical member are neutral concentration filters. The method of claim 14, And the main optical member is disposed between the thin film transistor corresponding to the fourth pixel and the first substrate. The method of claim 19, An auxiliary optical member disposed between the first substrate and the thin film transistors of the first pixel, the second pixel, and the third pixel; And the auxiliary optical member is disposed only at portions corresponding to the thin film transistors of the first pixel, the second pixel, and the third pixel. The method of claim 20, And the main optical member and the auxiliary optical member are polarizing plates. The method of claim 20, And the main optical member and the auxiliary optical member are neutral concentration filters. 4. The method of claim 3, The emission layer emits light in a direction opposite to the thin film transistor. The method of claim 23, The first pixel, the second pixel, the third pixel, and the fourth pixel are formed on the second electrode, respectively, and have a second surface opposite to the first surface facing the second electrode. Further includes 2 substrates, A color filter is formed on a first surface of the second substrate of the first pixel, the second pixel, and the third pixel. And an insulating film formed on a first surface of the second substrate of the fourth pixel. The method of claim 24, And the main optical member is disposed on a second surface of the second substrate corresponding to the fourth pixel. The method of claim 25, The main optical member is a polarizing plate. The method of claim 25, The main optical member is a neutral concentration filter. The method of claim 24, And the main optical member is disposed between the insulating layer corresponding to the fourth pixel and the first surface of the second substrate. The method of claim 28, The main optical member is a polarizing plate. The method of claim 28, The main optical member is a neutral concentration filter.

Images