KR100784554B1 - Organic light emitting display - Google Patents

Abstract

An organic electroluminescence display is provided to enhance display quality thereof by suppressing interference due to light emitted each of sub-pixels. An organic electroluminescence display includes an organic light emitting panel(110), a phase retardation plate(130) positioned on a light emitting surface of the organic light emitting panel, and a polarizing plate(140) having a light shielding pattern(142). The light shielding pattern is formed in a base layer on which a dichromic dye-based material is oriented. The organic light emitting panel includes a substrate and a pixel part having an emission region and a non-emission region. The emission region is defined as a region on which organic light emitting layers are positioned. The non-emission region includes an insulating layer which is positioned on a region separated from the organic light emitting layers. The light shielding patterns are formed on a region corresponding to the insulating layer.

Description

Organic Light Emitting Display

1 is a side view of an organic light emitting display device according to an embodiment of the present invention;

FIG. 2 is an enlarged view schematically showing a portion “Z” when the panel of FIG. 1 is a passive matrix type. FIG.

FIG. 3 is an enlarged view schematically showing a portion “Z” when the panel of FIG. 1 is an active matrix type. FIG.

4 is an enlarged view of a part of the polarizer illustrated in FIG. 1.

5 and 6 are partially enlarged views of a polarizer according to another embodiment.

<Explanation of symbols on main parts of the drawings>

110: panel 111: substrate

112: thin film transistor 113: first electrodes

114: bleeding film 115: organic light emitting

116: second electrodes 130: phase delay plate

140: polarizing plate 141: substrate layer

142: light shielding pattern P: pixel portion

SP: subpixel NA: non-light-emitting area

LA: emitting area

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

The organic light emitting display device used in the organic light emitting display device was a self-light emitting device having an organic light emitting layer formed between two electrodes formed on a substrate.

In the display device using the organic light emitting display device, the selected light emitting layer emits light by receiving a data signal and a scan signal from the driving device to express a desired image.

Such a display device can be divided into a top emission type, a bottom emission type, and a dual emission type according to a direction in which light is emitted, and a passive matrix type according to a driving method. It can be divided into (Passive Matrix) and Active Matrix (Active Matrix).

On the other hand, the organic light emitting display device, like other display devices are subject to a lot of interference due to external environmental conditions. In this regard, for example, problems of deteriorating display quality of the panel, such as incident light introduced into the panel under a bright external environment and overlapping with light emitted from the subpixels of the panel, lower the contrast ratio. Can be.

In order to improve the applicability of the display device using the organic light emitting display device than other devices, a method for solving interference caused by external environmental conditions as described above should be more actively presented.

An object of the present invention for solving the above problems is to improve the display quality of the organic light emitting display device.

In order to solve the above problems, the organic light emitting display device according to the present invention, an organic light emitting display panel; A phase delay plate on the light emitting surface of the panel; And a polarizing plate disposed on the phase delay plate and including light blocking patterns in a base layer oriented with a dichromic dye-based material.

The color filter may be positioned on any one of the inner side between the panel and the phase delay plate or the outer side of the polarizing plate.

The panel includes a substrate, a pixel portion divided into a light emitting region and a non-light emitting region on the substrate, wherein the light emitting region is defined as a region in which organic light emitting layers of respective subpixels formed in the pixel portion are located, and the non-light emitting region is an organic light emitting layer. The light blocking patterns may be formed at positions corresponding to the insulating film positioned in the non-light emitting area.

The light blocking pattern may be equal to or smaller than the width of the insulating layer positioned between the subpixel and the subpixel.

The light shielding pattern may be arranged in at least one of the transverse direction and the longitudinal direction at a position corresponding to the insulating film.

The light shielding pattern may have a wedge shape in which a lower portion contacting the phase delay plate is wider than an upper portion.

The phase delay plate may have a 1 / 4λ wavelength characteristic.

The dichroic dye-based material may be oriented in one direction by stretching.

The maximum polarization efficiency value of the polarizing plate may be adjusted to a wavelength corresponding to the maximum luminous curve value of the panel.

The maximum polarization efficiency value of the polarizing plate may be matched to a wavelength corresponding to the maximum external light intensity value.

The base layer may have different polarization efficiency or different transmittance for each of red, green, and blue.

The base layer may have high transmittance and low polarization efficiency in the wavelength region of red and blue.

In the non-light emitting area, one or more thin film transistors and capacitors for driving the organic light emitting layers may be included in the subpixels, respectively.

<Example 1>

1 is a side view of an organic light emitting display device according to an embodiment of the present invention.

(However, it is noted that the phase delay plate and the polarizing plate are shown spaced apart from the panel by a certain distance for convenience of explanation.)

Referring to FIG. 1, the organic light emitting display device 100 according to the present invention includes an organic light emitting display panel 110, a phase delay plate 130, and a phase delay disposed on a light emitting surface of the panel 100. The polarizer 140 is disposed on the plate 130 and includes light blocking patterns 142 in the base layer 141 oriented with a dichroic dye-based material.

Here, the case where the panel 110 is a passive matrix type will be described as an example.

FIG. 2 is an enlarged view schematically showing a portion “Z” when the panel of FIG. 1 is a passive matrix type.

Referring to FIG. 2, the passive matrix type organic light emitting display panel 110 includes a substrate 111, and a pixel portion P divided into a light emitting area LA and a non-light emitting area NA on the substrate 111. ) Is included.

The light emitting area LA is defined as an area in which the organic light emitting layers 115 are positioned in each of the sub-pixels SP formed in the pixel portion P, and the non-light emitting area NA is distinguished from the organic light emitting layers 115. It is defined as an area including the insulating film 114 located in the region to be.

Here, the light blocking patterns 142 included in the base layer 141 of the polarizing plate 140 may include the insulating layer 114 positioned in the panel 110, that is, in the non-light emitting area NA, which is divided on the substrate 111. Is formed in the corresponding position.

The passive matrix organic light emitting display panel 110 is briefly described as follows.

First and second electrodes 113 and 116 are formed on the substrate 111 to cross each other in a matrix form. The first electrodes 113 and the second electrodes 116 may be selected as transparent electrodes (for example, ITO) or opaque electrodes (for example, Al) according to the light emission method. The insulating layer 114 is formed to have an opening on some regions including the first electrodes 113, and the organic light emitting layers 115 are positioned in the opening. Here, the region where the organic light emitting layers 115 are positioned is divided into the light emitting regions LA as described above. The second electrodes 116 are separated from the first electrodes 113 on the organic light emitting layers 115 by a partition not shown on the insulating layer 114 positioned in the non-light emitting region NA, thereby forming a first electrode. The electrodes 113 and the second electrodes 116 have a matrix structure intersecting with each other.

The light blocking patterns 142 included in the base layer 141 of the polarizing plate 140 are formed at positions corresponding to the insulating layer 114 positioned on the non-light emitting region NA described above.

Here, it is very important that the light blocking patterns 142 are formed at positions corresponding to the insulating layer 114 positioned on the non-light emitting region NA.

As such, when the light blocking patterns 142 are positioned, the contrast can be increased by effectively absorbing and blocking incident light incident from the outside, so that the same luminance can be realized among the same subpixels SP. This can bring about savings.

The structure of the light blocking patterns 142 may be applied to an active matrix type as well as a passive matrix type, which will be described below with reference to FIG. 3.

FIG. 3 is an enlarged view schematically illustrating a portion “Z” when the panel of FIG. 1 is an active matrix type.

The active matrix organic light emitting display panel 110 includes a substrate 111, and a pixel portion P divided into a light emitting area LA and a non-light emitting area NA is provided on the substrate 111.

The light emitting area LA is defined as an area in which the organic light emitting layers 115 are positioned in each of the sub-pixels SP formed in the pixel portion P, and the non-light emitting area NA is distinguished from the organic light emitting layers 115. It is defined as an area including the insulating film 114 located in the region to be.

Here, the light blocking patterns 142 included in the base layer 141 of the polarizing plate 140 may include the insulating layer 114 positioned in the panel 110, that is, in the non-light emitting area NA, which is divided on the substrate 111. Is formed in the corresponding position.

The active matrix organic light emitting display panel 110 is briefly described as follows.

Thin film transistors 112 are formed on the substrate 111. The thin film transistors 112 may include a semiconductor layer, a first insulating layer, a gate electrode, a second insulating layer, a source electrode, and a drain electrode.

The first electrodes 113 are electrically connected to the source or drain electrodes of the thin film transistors 112. The insulating layer 114 is formed to have an opening on some regions including the first electrodes 113, and the organic light emitting layers 115 are positioned in the opening. Here, the region where the organic light emitting layers 115 are positioned is divided into the light emitting regions LA as described above. The second electrodes 116 are formed on the insulating layer 114 and the organic light emitting layers 115 positioned in the non-emission area NA.

In the case of the active matrix type organic light emitting display panel 110, the light blocking pattern 142 included in the base layer 141 of the polarizing plate 140 may have the insulating layer 114 positioned on the non-light emitting area NA described above. Is formed in the corresponding position. In addition, it is very important that the light shielding patterns 142 are also formed at positions corresponding to the insulating layer 114 positioned on the non-light emitting area NA.

As such, when the light blocking patterns 142 are positioned, the contrast can be increased by effectively absorbing and blocking incident light incident from the outside, so that the same luminance can be realized among the same subpixels SP. This can bring about savings.

Hereinafter, the polarizing plate 140 including the light blocking patterns 142 in the substrate layer 141 will be described in more detail with reference to FIG. 4.

4 is a partially enlarged view of the polarizer shown in FIG. 1, and FIGS. 5 and 6 are partially enlarged views of a polarizer according to another embodiment.

As shown in FIG. 4, the light blocking patterns 142 are formed in a wedge shape having a lower portion that contacts the phase delay plate 130 is wider than an upper portion.

As described above, the light shielding pattern 142 is positioned to correspond to the insulating layer 114 positioned in the non-light emitting region NA so as to prevent moiré from occurring due to a change in pitch and width. In particular, it may be efficient to form the same as or smaller than the width of the insulating film 114 positioned between the subpixel and the subpixel.

In addition, the light shielding pattern 142 may be arranged in at least one of a transverse direction and a longitudinal direction at a position corresponding to the insulating layer 114, and with reference to FIGS. 5 and 6.

Examples of the material of the light shielding pattern 142 include black carbon, carbon nanotubes, silicon oxide, silicon nitride, and the like, and the metal powder may also serve as an electromagnetic shielding function. .

On the other hand, the phase delay plate 130 has a wavelength characteristic of 1/4 λ, the phase delay plate 130 and the polarizing plate 140 is in the form of a circularly polarizing film (Circularly Polarizing film) laminated with each other using an adhesive or the like.

Here, the base layer 141 of the polarizing plate 140 is an iodine-based material is oriented in one direction by stretching. In detail, polyvinyl alcohol or the like may be used as the base layer 141, and the iodine-based material is stretched and oriented on the polyvinyl alcohol.

Dye-based materials generally do not absorb red and blue light better than iodine-based materials. Therefore, the polarizing plate 140 made of a dye-based material passes red and blue light well.

Accordingly, the polarizer 140 may increase the luminous efficiency of the red and blue subpixels and reduce their power consumption so that red, green, and blue light can be emitted with the same brightness even when less power is applied. do.

Meanwhile, the maximum polarization efficiency value of the polarizer 140 may be adjusted to a wavelength corresponding to the maximum luminous curve value of the panel or to a wavelength corresponding to the maximum external light intensity value.

In this regard, depending on the degree of dyeing of the dichroic dye-based material, the main absorption wavelength region, the main absorption wavelength region single plate transmittance, the main absorption wavelength region polarization degree, the average platelet transmittance of the specific region, and the luminous polarization of the specific region can be adjusted. See Yes.

According to such a condition, the dichroic dye-based polarizing plate 140 has a transmittance of about 60% or more for red and blue light, and a transmittance of about 45% to 50% for green light.

Accordingly, the central wavelength of the blue light may be approximately 460 nm, the central wavelength of the green light may be approximately 520 nm, and the central wavelength of the red light may be approximately 620 nm. According to such a condition, the polarizing plate 140 may be dyed to have different polarization efficiency or different transmittance for each of red, green, and blue, and may be dyed to increase transmittance and lower polarization efficiency in the wavelength region for red and blue. You can do it.

As described above, in the organic light emitting display device 100 according to the present invention, light incident to the polarizer 140 from the outside is primarily blocked by the base layer 141 and the light shielding pattern 142, and thus is only phased in one direction. Incident to the delay plate 130. This is because the polarizer 140 is oriented in one direction, and the incident angle is limited by the light blocking pattern 142.

On the other hand, the light incident to the phase delay plate 130 is converted into a circular polarization state by the wavelength is delayed by the 1 / 4λ wavelength characteristics, which is the central axis of the phase delay plate 130 and the central axis of the polarizing plate 140 This is because it forms an angle of 45 degrees.

Subsequently, the incident light is reflected by the second electrode 116 (some of absorption or egg reflection), and then passes through the phase delay plate 130 to be converted into a linearly polarized state. At this time, the reflected light passing through the phase delay plate 130 again becomes perpendicular to the external incident light that did not pass through the phase delay plate 130. In this case, the incident light is delayed by 1 / 2λ every time the phase delay plate 130 passes in this manner, and since the incident light is mostly polarized, the incident light disappears.

Accordingly, the organic light emitting display device according to the present invention not only blocks light incident from the outside, but also pixelates each subpixel to prevent interference with light emitted from each subpixel by incident light. The display quality can be increased. In addition, since the contrast can be increased, the same luminance can be realized among the same subpixels, and power consumption can be reduced accordingly.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

As described above, the present invention has the effect of improving the display quality of the organic light emitting display device.

Claims (12)

Organic light emitting display panel; A phase delay plate on the light emitting surface of the panel; And An organic light emitting display device comprising: a polarizer disposed on the phase delay plate and having a light blocking pattern embedded in a substrate layer oriented with a dichromic dye-based material. The method of claim 1, wherein the panel, A substrate, and a pixel portion divided into a light emitting area and a non-light emitting area on the substrate, The light emitting area is defined as an area in which the organic light emitting layers of each of the subpixels formed in the pixel portion are located, and the non-light emitting area is defined as a region including an insulating layer located in a region distinct from the organic light emitting layers. The light shielding patterns, And an organic light emitting display device formed at a position corresponding to the insulating layer positioned in the non-emission area. The method of claim 2, wherein the light shielding pattern, An organic light emitting display device, characterized in that it is equal to or smaller than the width of an insulating layer positioned between the subpixels. The method of claim 2, wherein the light shielding pattern, And at least one of a transverse direction and a longitudinal direction at a position corresponding to the insulating layer. The method of claim 1, wherein the light shielding pattern, And a lower portion of the lower surface contacting the phase delay plate is wider than the upper portion thereof. The method of claim 1, wherein the phase delay plate, An organic light emitting display device having a wavelength characteristic of 1/4. The method of claim 1, wherein the dichroic dye-based material, An organic light emitting display device which is oriented in one direction by stretching. The maximum polarization efficiency value of the polarizing plate, The organic light emitting display device according to claim 1, wherein the organic light emitting display device is set to a wavelength corresponding to a maximum luminous curve value of the panel. The maximum polarization efficiency value of the polarizing plate, An organic light emitting display device, characterized in that for matching a wavelength corresponding to a maximum external light intensity value. The method of claim 1, wherein the base layer, An organic light emitting display device having different polarization efficiency or different transmittance for each of red, green, and blue. The method of claim 1, wherein the base layer, An organic light emitting display device, characterized in that the transmittance is increased and the polarization efficiency is lowered in the wavelength region of red and blue. The method of claim 2, wherein the non-light emitting area, And at least one thin film transistor and a capacitor for driving the organic light emitting layers are respectively included in the sub-pixels.

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