KR100666645B1 - Organic electro luminescence display device - Google Patents

Abstract

An organic electro-luminescence display device is provided to obtain a layout space and to improve the convenience of a layout design of the organic electro-luminescence display device by not providing an additional capacitor receiving a DC-DC converter voltage. An organic electro-luminescence display device includes a first electrode(330), a second electrode(340), and a DC-DC converter link electrode(270). The first electrode(330) receives a first voltage from a power unit(200). The first electrode(330) transmits the first voltage to a display panel through a plurality of first providing lines. The second electrode(340) receives a second voltage from a DC-DC converter. The second electrode(340) transmits the second voltage to the display panel through a plurality of second providing lines. The DC-DC link electrode(270) connects the DC-DC converter to the second electrode(340). The first and second electrodes(330,340) are arranged to be opposite to each other. The DC-DC converter link electrode(270) is generated to connect the DC-DC converter to the second electrode(340) by inserting a metallic material into a contact hole which is generated so that a part of the second electrode(340) is exposed.

Description

Organic Electro Luminescence Display Device

1 is a block diagram schematically illustrating an organic light emitting display device including a display panel unit according to an exemplary embodiment of the present invention.

2 is a cross-sectional view of a portion of a display panel of an organic light emitting display device according to an exemplary embodiment of the present invention.

3 is a cross-sectional view of a portion of a display panel unit of an organic light emitting display device according to another exemplary embodiment.

The present invention relates to an organic electroluminescent display, and more particularly, an ELVDD voltage and a DC-DC converter voltage transmitted to a display panel unit are applied to a first capacitor and a second capacitor connected in parallel to each other. ELVDD electrode and DC-DC to increase the luminous efficiency of the display panel unit and to secure layout space and improve layout design convenience of the organic electroluminescent display device as a separate capacitor for receiving the DC-DC converter voltage is not provided. An organic electroluminescent display device having a converter electrode is provided.

In general, an organic electroluminescent display is a flat self-emission display that emits light by applying an electric field to a phosphor coated on a glass substrate or a transparent organic film. Electroluminescence refers to a phenomenon of emitting light when an electric field is applied to a phosphor made of a semiconductor.

Recently, liquid crystal display LCDs and organic EL display OLEDs have been used for portable information devices due to their light weight and thinness. Organic electroluminescent display devices are attracting attention as next-generation flat panel display devices because they have better luminance and viewing angle characteristics than liquid crystal displays.

Typically, pixels formed in the active matrix organic electroluminescent display AMOLED are composed of R, G, and B subpixels, and each of the R, G, and B subpixels includes an organic electroluminescent display element. Each organic electroluminescent display device is formed from an organic film formed of an R, G, B organic light emitting layer by a voltage applied to the anode electrode and the cathode electrode through each R, G, B organic light emitting layer between the anode electrode and the cathode electrode. Emits light.

In addition, the active matrix organic EL display device AMOLED drives the N * M organic electroluminescent display elements by using a voltage programming method or a current programming method.

The problems associated with the present invention and solved by the present invention are as follows.

As a separate capacitor is configured to transfer the ELVDD voltage and the DC-DC converter voltage to the display panel of the organic light emitting display, the stability of the output load decreases and the layout space of the organic light emitting display increases. .

An object of the present invention is the ELVDD voltage and the DC-DC converter voltage transferred to the display panel portion of the organic electroluminescent display device is applied to the first capacitor and the second capacitor connected in parallel to the luminous efficiency of the display panel portion according to the stability of the output load This makes it possible to increase the height and to secure layout space and improve layout design convenience of the organic light emitting display device as a separate capacitor for receiving the DC-DC converter voltage is not provided.

A power supply unit for generating a first voltage, a DC-DC converter for generating a second voltage by inverting and boosting the voltage to a predetermined level by receiving the first voltage, a DC-DC converter, a scan driver, and a plurality of pixels. An organic electroluminescent display comprising a display panel portion displayed through

A first electrode receiving a first voltage from the power supply unit and transferring the first voltage to the display panel unit through a plurality of first supply lines; A second electrode receiving a second voltage from the DC-DC converter and transferring the second voltage to the display panel unit through a plurality of second supply lines; And a DC-DC converter link electrode connecting the DC-DC converter and the second electrode to each other, wherein the first electrode and the second electrode are disposed to correspond to each other, thereby forming a capacitor. Provided is a light emitting display device.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

1 is a block diagram schematically illustrating an organic light emitting display device including a display panel unit according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the organic light emitting display device includes a display panel unit 100 and a power supply unit 200.

That is, the display panel unit 100 includes a plurality of data lines D1 -Dm extending in a column direction, a plurality of scan lines S1 -Sn extending in a row direction, and a plurality of light emission control lines extending in a row direction. (EMI1-EMIn), a plurality of pixels (P11-Pnm: 110), a scan driver 120, a data driver 130, and a DC-DC converter 140.

First, the plurality of pixels P11-Pnm 110 are formed by regions where a plurality of data lines D1 -Dm, a plurality of scan lines S1 -Sn, and a plurality of emission control lines EMI1 -EMIn cross each other. It is formed in the pixel region 115 to be defined.

In detail, the plurality of pixels P11-Pnm 110 perform a display operation through the organic electroluminescent display OLED OLED already mounted by the plurality of pixel circuits being electrically connected.

The scan driver 120 is connected to a plurality of scan lines S1 -Sn and a plurality of emission control lines EMI1 -EMIn to scan signals for sequentially selecting the plurality of pixels P11 -Pnm 110. (S1, S2, S3, ..., Sn) and emission control signals EMI1, EMI2, EMI3, ..., EMIn for controlling the emission time are applied.

The data driver 130 is connected to a plurality of data lines D1, D2, D3,..., And Dm to apply a data signal for displaying a pixel selected by the scan signal of the scan driver 130. . That is, a driving current corresponding to the data signal is applied to the pixel, and the driving current is transferred to the organic electroluminescent display OLED according to the electrical connection flow to the pixel circuit formed in the pixel. As a result, the organic electroluminescent device OLED is displayed.

In general, the DC-DC converter 140 switches DC voltage to invert AC voltage, boosts or steps down the AC voltage using a coil, transformer, and capacitance, and then rectifies the DC voltage to DC-DC converter voltage. Circuit.

That is, the DC-DC converter 140 according to the present invention receives a predetermined power supply voltage from the power supply unit 150 included in the organic light emitting display device, inverts the voltage to a predetermined level, and boosts the DC-DC converter voltage. Create In addition, the DC-DC converter 140 delivers the DC-DC converter voltage to the scan driver 120 through a plurality of supply lines.

Here, the power supply unit 150 applies the power supply voltage to the DC-DC converter 140, the plurality of pixels 110, and the data driver 130 except for the scan driver 120.

2 is a cross-sectional view of a portion of a display panel of an organic light emitting display device according to an exemplary embodiment of the present invention.

Referring to FIG. 2, a cross-sectional view according to an exemplary embodiment of the present invention is divided into a capacitor unit 200 and a scan driver unit 210. The display panel unit of the organic light emitting display device includes a scan driver and includes a plurality of pixels. To execute the display operation.

First, the manufacturing process for forming the cross-sectional view includes a substrate 220 made of glass, a synthetic resin, or the like, and a silicon oxide film, a silicon nitride film, and a silicon oxide film / nitride film (SiO 2) to prevent impurities from flowing out from the top of the substrate 220. One of the stacked layers of / SiNx) is selected to form the buffer layer 230.

However, the buffer layer is not necessarily formed, it is preferable to form selectively.

Next, after the amorphous silicon film is coated and crystallized over the entire surface of the substrate to form a polysilicon film, the polysilicon film is patterned to the first semiconductor layer pattern 240 and the scan driver 210 in the capacitor part 200. The second semiconductor layer pattern 250 is provided, and a gate insulating layer 260 is formed over the entire surface of the substrate.

Next, a first metal film pattern 270 is formed by depositing and patterning a gate electrode material on the gate insulating layer 260 to correspond to the first semiconductor layer pattern 240 formed in the capacitor unit 200.

However, the gate electrode material according to the embodiment of the present invention is deposited in one direction by the size of the first semiconductor layer pattern 240 and patterned to form the first metal film pattern 270. In addition, the first metal film pattern 270 is collectively referred to as a lower electrode or a DC-DC converter electrode.

Next, a second metal film pattern 280 is formed by depositing and patterning a gate electrode material on the gate insulating layer 260 to correspond to a channel region of the second semiconductor layer pattern 250 defined in the scan driver 210. ) And ion doping the second semiconductor layer pattern of the scan driver unit 210 using the second metal layer pattern 280 as a mask to define the source region and the drain region.

The gate electrode material may be formed of at least one metal material among alloys including metal materials such as chromium (Cr), molybdenum (Mo), aluminum (Al), or silver (Ag).

Next, an interlayer insulating film 290 is formed over the entire surface of the substrate, and the predetermined interlayer insulating film 290 and the gate insulating film 260 formed in the capacitor part 200 are penetrated to form a predetermined portion of the first semiconductor layer pattern 240. The first contact hole 300 is formed to expose a portion of the first contact hole 300.

In addition, in the capacitor unit 200, an interlayer insulating layer 290 formed in the capacitor unit 200 in addition to the one in which the first contact hole 300 is formed in the first semiconductor layer pattern 240 is formed. A second contact hole 310 penetrating the bay is formed to expose a portion of the first metal film pattern 270 that is formed as large as the size of the first semiconductor layer pattern 240.

Next, a third contact is formed through the interlayer insulating layer 290 and the gate insulating layer 260 formed in the scan driver 210 to expose a predetermined portion of the source region and the drain region of the second semiconductor layer pattern 250. The hole 320 is formed.

Next, a source / drain electrode material is deposited on the capacitor unit 200 so that an upper portion of the interlayer insulating layer 290 and a source / drain region of the first semiconductor layer pattern 240 are connected to each other through the first contact hole 300. And patterning to form a first source / drain electrode 330. Accordingly, the first source / drain electrode 330 transfers the ELVDD voltage, which is a power voltage applied from the power supply unit, to the display panel unit by using a plurality of first supply line electrodes that are already connected.

Here, the first source / drain electrode 330 is collectively named as an upper electrode or an ELVDD electrode, and the first source / drain electrode 330 is interlayer to form a capacitor with the DC-DC converter electrode, which is the lower electrode. The DC-DC converter electrode is deposited and patterned on the insulating layer 290.

Next, in the capacitor unit 200, the upper portion of the interlayer insulating layer 290 and the first metal layer are formed through the second contact hole 310 in one other than the ELVDD electrode formed on the interlayer insulating layer 290. The source / drain electrode material is deposited and patterned so that the pattern 270 is connected to form the second source / drain electrode 340. Accordingly, the second source / drain electrode 340 transfers the DC-DC converter voltage to the display panel unit by using a DC-DC converter electrode and a plurality of second supply line electrodes that are already connected.

In other words, the second source / drain electrode 340 receives the DC-DC converter voltage generated through the DC-DC converter that receives the ELVDD voltage applied from the power supply unit, inverts the voltage to a predetermined level, and boosts the voltage. Pass in wealth.

Here, the second source / drain electrode 340 is collectively named as a DC-DC converter link electrode, and the second source / drain electrode 340 is connected to the DC-DC converter in a circuit.

Next, a source / drain electrode material is deposited through the third contact hole 320 so that the upper portion of the interlayer insulating layer 290 and the source / drain regions of the second semiconductor layer pattern 210 are connected to the scan driver 210. And patterning to form a third source / drain electrode 350.

Here, the source / drain electrode material is made of at least one metal material among alloys including metal materials such as tungsten (W), molybdenum (Mo), aluminum (Al) or silver (Ag).

Next, the passivation layer 290 is formed by selecting one of a silicon oxide layer SiO 2, a silicon nitride layer SiNx, and a stacked layer over the entire surface of the substrate including the capacitor unit 200 and the scan driver unit 210. Form.

However, the passivation film is not necessarily formed, and is formed selectively.

Next, a planarization film, which is at least one organic film among an acrylic resin, a benzocyclobutene resin (BCB), a polyimide resin (PI), a spin on glass (SOG), an acrylate (Acrylate), or a polyphenol resin, is disposed on the passivation layer. Form.

According to an exemplary embodiment of the present invention, the upper electrode, the ELVDD electrode, the DC-DC converter link electrode, and the lower electrode, the DC-DC converter electrode connected through the second contact hole 310, form a first capacitor. In addition, the DC-DC converter electrode, which is a lower electrode connected through the DC-DC converter link electrode and the second contact hole 310, and the first semiconductor layer pattern 240 form a second capacitor.

Therefore, the ELVDD voltage and the DC-DC converter voltage transferred to the display panel unit are applied to the first capacitor and the second capacitor connected in parallel, thereby increasing the luminous efficiency of the display panel unit due to the stability of the output load. In addition, as a separate capacitor for receiving the DC-DC converter voltage is not provided, securing layout space and layout design convenience of the organic light emitting display device are improved.

However, according to the embodiment of the present invention, it is noted that when the ELVDD electrode is the first electrode, the DC-DC converter electrode is the second electrode, and when the ELVDD electrode is the first electrode, the DC-DC converter electrode is the second electrode.

3 is a cross-sectional view of a portion of a display panel unit of an organic light emitting display device according to another exemplary embodiment.

Referring to FIG. 3, a cross-sectional view according to another exemplary embodiment of the present invention is divided into a capacitor unit 200 and a scan driver unit 210. The display panel unit of the organic light emitting display device includes a scan driver and includes a plurality of pixels. The display operation is executed through.

First, the manufacturing process for forming the cross-sectional view includes a substrate 220 made of glass, a synthetic resin, or the like, and a silicon oxide film, a silicon nitride film, and a silicon oxide film / nitride film (SiO 2) to prevent impurities from flowing out from the top of the substrate 220. One of the stacked layers of / SiNx) is selected to form the buffer layer 230.

However, the buffer layer 230 is not necessarily formed, it is preferable to form selectively.

Next, after the amorphous silicon film is coated and crystallized over the entire surface of the substrate to form a polysilicon film, the polysilicon film is patterned to the first semiconductor layer pattern 240 and the scan driver 210 in the capacitor part 200. The second semiconductor layer pattern 250 is provided, and a gate insulating layer 260 is formed over the entire surface of the substrate.

Next, a first metal film pattern 270 is formed by depositing and patterning a gate electrode material on the gate insulating layer 260 to correspond to the first semiconductor layer pattern 240 formed in the capacitor unit 200.

However, the gate electrode material according to another embodiment of the present invention is deposited and patterned in one direction by the size of the first semiconductor layer pattern 240 to form the first metal film pattern 240. In addition, the first metal film pattern 240 is collectively referred to as a lower electrode or an ELVDD electrode.

Next, a second metal film pattern 280 is formed by depositing and patterning a gate electrode material on the gate insulating layer 260 to correspond to a channel region of the second semiconductor layer pattern 250 defined in the scan driver 210. ) And ion doping the second semiconductor layer pattern 250 of the scan driver 210 with the second metal layer pattern 280 as a mask to define the source region and the drain region.

The gate electrode material may be formed of at least one metal material among alloys including metal materials such as chromium (Cr), molybdenum (Mo), aluminum (Al), or silver (Ag).

Next, an interlayer insulating film 290 is formed over the entire surface of the substrate, and the predetermined interlayer insulating film 290 and the gate insulating film 260 formed in the capacitor part 200 are penetrated to form a predetermined portion of the first semiconductor layer pattern 240. The first contact hole 300 is formed to expose a portion of the first contact hole 300.

In addition, in the capacitor unit 200, an interlayer insulating layer 290 formed in the capacitor unit 200 in addition to the one in which the first contact hole 300 is formed in the first semiconductor layer pattern 240 is formed. A portion of the first metal film pattern 270 generated as large as the size of the first semiconductor layer pattern 240 is exposed through the second contact hole 310 penetrating only the bay.

Next, a third contact is formed through the interlayer insulating film 290 and the gator insulating film 260 formed in the scan driver 210 to expose a predetermined portion of the source region and the drain region of the second semiconductor layer pattern 250. The hole 320 is formed.

Next, a source / drain electrode material is deposited on the capacitor unit 200 so that an upper portion of the interlayer insulating layer 290 and a source / drain region of the first semiconductor layer pattern 240 are connected to each other through the first contact hole 300. And patterning to form a first source / drain electrode 270. That is, the first source / drain electrode 270 transfers the DC-DC converter voltage to the display panel unit by using a plurality of first supply line electrodes that are already connected.

In other words, the first source / drain electrode 270 receives the ELVDD voltage applied from the power supply unit, inverts to a predetermined level, and inverts and boosts the DC-DC converter voltage generated through the DC-DC converter unit to the display panel unit. To pass.

Here, the first source / drain electrode 270 is collectively named as an upper electrode or a DC-DC converter electrode, and is connected to the DC-DC converter, which is the first source / drain electrode 270, in a circuit.

Next, in the capacitor unit 200, the DC-DC converter electrode is formed on the interlayer insulating layer 290, and the upper part of the interlayer insulating layer 290 and the second is formed through the second contact hole 310. The source / drain electrode material is deposited and patterned so that the first metal film pattern 270 is connected to form the second source / drain electrode 340. Accordingly, the second source / drain electrode 340 transfers the ELVDD voltage, which is a power voltage applied from the power supply unit, to the display panel unit by using a plurality of second supply line electrodes that are already connected.

In this case, the second source / drain electrode 340 is collectively named as an ELVDD link electrode. The second source / drain electrode 340 is deposited and patterned on the interlayer insulating layer 290 by the size of the ELVDD electrode to form a capacitor with the DC-DC converter electrode.

Next, a source / drain electrode material is deposited on the scan driver 210 so that the upper portion of the interlayer insulating layer 290 and the source / drain regions of the second semiconductor layer pattern 250 are connected to each other through the third contact hole 320. And patterning to form a third source / drain electrode 280.

Here, the source / drain electrode material is made of at least one metal material among alloys including metal materials such as tungsten (W), molybdenum (Mo), aluminum (Al) or silver (Ag).

Next, the passivation layer 360 may be formed by selecting one of a silicon oxide layer SiO 2, a silicon nitride layer SiNx, and a stacked layer over the entire surface of the substrate including the capacitor unit 200 and the scan driver unit 210. Form.

However, the passivation film 360 is not necessarily formed, and is selectively formed.

Next, at least one organic layer of an acrylic resin, a benzocyclobutene resin (BCB), a polyimide resin (PI), a spin on glass (SOG), an acrylate (Acrylate), or a polyphenol resin on the passivation layer 360 Phosphorous planarization film 370 is formed.

According to an exemplary embodiment of the present invention, a first capacitor is formed by grafting the DC-DC converter electrode, the upper electrode, and the ELVDD electrode, the lower electrode connected through the ELVDD link electrode and the second contact hole 310. In addition, the ELVDD electrode, which is a lower electrode connected through the ELVDD link electrode and the second contact hole 310, and the first semiconductor layer pattern form a second capacitor.

Therefore, the ELVDD voltage and the DC-DC converter voltage transferred to the display panel unit are applied to the first capacitor and the second capacitor connected in parallel, thereby increasing the luminous efficiency of the display panel unit due to the stability of the output load. In addition, as a separate capacitor for receiving the DC-DC converter voltage is not provided, securing layout space and layout design convenience of the organic light emitting display device are improved.

However, according to the embodiment of the present invention, it is noted that when the ELVDD electrode is the first electrode, the DC-DC converter electrode is the second electrode, and when the ELVDD electrode is the first electrode, the DC-DC converter electrode is the second electrode.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

According to the present invention described above, the organic electroluminescent display device is applied to the first capacitor and the second capacitor connected in parallel with the ELVDD voltage and the DC-DC converter voltage transferred to the display panel unit to stabilize the output load. The luminous efficiency becomes high.

In addition, since a separate capacitor for receiving the DC-DC converter voltage is not provided, securing layout space and improving layout design convenience of the organic light emitting display device are provided.

Claims (6)

A power supply unit for generating a first voltage, a DC-DC converter for generating a second voltage by inverting and boosting the voltage to a predetermined level by receiving the first voltage, a DC-DC converter, a scan driver, and a plurality of pixels. An organic electroluminescent display comprising a display panel portion displayed through A first electrode receiving a first voltage from the power supply unit and transferring the first voltage to the display panel unit through a plurality of first supply lines; A second electrode receiving a second voltage from the DC-DC converter and transferring the second voltage to the display panel unit through a plurality of second supply lines; And And a DC-DC converter link electrode connecting the DC-DC converter and the second electrode to each other. And a capacitor formed as the first electrode and the second electrode correspond to each other. The DC-DC converter link electrode of claim 1, wherein the DC-DC converter and the second electrode are connected to each other by inserting a metal material into a contact hole formed to expose a portion of the second electrode. Organic electroluminescent display. The organic electroluminescent display of claim 2, wherein a capacitance is formed between the first electrode and the second electrode due to a potential difference formed between the first voltage of the first electrode and the second voltage of the second electrode. Device. The organic light emitting display device according to claim 3, wherein the first voltage output from the first supply line is applied to the display panel in the same direction as the second voltage output from the second electrode. The organic electroluminescent display device according to claim 4, wherein the first voltage is transmitted to a plurality of pixels provided in the display panel unit through the first supply line. The organic light emitting display device of claim 4, wherein the second voltage is transmitted to a scan driver provided in the display panel unit through the second supply line.

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