Pixel structure

A pixel structure includes a metal oxide semiconductor layer, a first insulating layer, a second insulating layer, a first conductive layer, a passivation layer, a second conductive layer and a pixel electrode. The metal oxide semiconductor layer includes a second semiconductor pattern. The first insulating layer includes a first capacitance dielectric pattern disposed on the second semiconductor pattern. The second insulating layer includes a second capacitance dielectric pattern disposed on the first capacitance dielectric pattern. The first conductive layer includes a electrode pattern disposed on the second capacitance dielectric pattern. The passivation layer covers the first conductive layer. The second conductive layer includes a second electrode disposed on the passivation layer. The second electrode is electrically connected to the second semiconductor pattern. The second electrode is disposed to overlap the electrode pattern. The second semiconductor pattern, the electrode pattern and the second electrode form a storage capacitor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority to and the benefit of, pursuant to 35 U.S.C. §119(a), Taiwanese Patent Application No. 104125616, filed Aug. 6, 2015, the content of which is incorporated herein in its entirety by reference.

TECHNICAL FIELD

The disclosure relates generally to a pixel structure, and in particular to a pixel structure provided with at least two storage capacitors.

BACKGROUND

A flat panel display has the advantages of being small, lightweight, low in power consumption, and so forth, and therefore the flat panel display has already replaced the Cathode Ray Tube, or CRT, to become the trend of a new generation of displays. However, along with the increasingly mature development of flat panel display technologies, users have increasingly higher requirements for the display quality of flat panel displays, in addition to the size, weight, and so forth, and the display quality of flat panel displays is highly related to the design of their pixel structures.

Generally speaking, a pixel structure includes an active element, a pixel electrode, and a storage capacitor. The active element is used as a switch component of the pixel structure. The pixel electrode is used for providing operation voltage for driving a display medium. The storage capacitor is used for holding the operation voltage of the pixel electrode. If the storage capacitance of the storage capacitor is insufficient, the operation voltage of the pixel electrode cannot be maintained till the next time the active element is started. In this case, abnormal display may be caused by the condition that the operation voltage of the pixel electrode is lower than a predetermined value. Therefore, in order to maintain a certain display quality, the storage capacitor in the pixel structure must have a sufficient capacitance value to ensure maintenance of the operation voltage.

One technical method which ensures the storage capacitor to have a sufficient capacitance value is to provide an electrode of the storage capacitor having sufficient area. However, the electrode of the storage capacitor is generally made of non-transparent materials, and when the area of the electrode of the storage capacitor increases, the aperture ratio of the pixel electrode becomes smaller. Thus, the display quality is deteriorated due to the insufficient brightness of the flat panel display. Therefore, one of the problems to be solved is to effectively increase the capacitance value of the storage capacitor while maintaining a good aperture ratio of the pixel electrode.

SUMMARY OF THE INVENTION

One aspect of the invention provides a pixel structure, which can effectively increase capacitance value of a storage capacitor while maintaining a good aperture ratio.

In certain embodiments, the pixel structure includes a metal oxide semiconductor layer, a first insulating layer, a second insulating layer, a first conductive layer, a passivation layer, a second conductive layer, and a pixel electrode. The metal oxide semiconductor layer includes a first semiconductor pattern and a second semiconductor pattern, wherein the first semiconductor pattern includes a first doping region, a second doping region, and a channel region, and the first doping region and the second doping region are disposed on the two sides of the channel region, respectively. The second semiconductor pattern includes a contact portion and an electrode portion. The first insulating layer includes a first gate insulation pattern and a first capacitance dielectric pattern, the first gate insulation pattern is disposed on the first semiconductor pattern, and the first capacitance dielectric pattern is disposed on the second semiconductor pattern. The second insulating layer includes a second gate insulation pattern and a second capacitance dielectric pattern, the second gate insulation pattern is disposed on the first gate insulation pattern, and the second capacitance dielectric pattern is disposed on the first capacitance dielectric pattern. The first conductive layer includes a gate and an electrode pattern, the gate is disposed on the second gate insulation pattern, and the electrode pattern is disposed on the second capacitance dielectric pattern. The passivation layer covers the metal oxide semiconductor layer and the first conductive layer and is provided with a first opening through which the first doping region of the first semiconductor pattern is exposed, a second opening through which the second doping region of the first semiconductor pattern is exposed, a third opening through which the contact portion is exposed, and a fourth opening through which the electrode pattern is exposed. The second conductive layer is disposed on the passivation layer and includes a first electrode, a second electrode, and a second electrode connected with the second electrode extending portion, the first electrode is electrically connected with the first doping region of the first semiconductor pattern through the first opening, and the second electrode is electrically connected with the second doping region of the first semiconductor pattern through the second opening, and the second electrode extending portion is electrically connected with the contact portion of the second semiconductor pattern through the third opening. The second electrode extending portion is disposed to partially overlap the electrode pattern. The gate, the first semiconductor pattern, the first electrode, and the second electrode constitute the active element, the second semiconductor pattern partially overlaps the electrode pattern and is coupled with the electrode pattern to constitute a first storage capacitor, and the electrode pattern partially overlaps the second electrode extending portion and is coupled with the second electrode extending portion to constitute a second storage capacitor. The pixel electrode is electrically connected with the second electrode.

In a further aspect, a pixel structure includes a metal oxide semiconductor layer, a first insulating layer, a second insulating layer, a conductive pattern, a first conductive layer, a passivation layer, a second conductive layer and a pixel electrode. The metal oxide semiconductor layer includes a first semiconductor pattern and a second semiconductor pattern, wherein the first semiconductor pattern includes a first doping region, a second doping region and a channel region. The first doping region and the second doping region are disposed on the two sides of the channel region, and the second semiconductor pattern includes a contact portion and an electrode portion. The first insulating layer includes a first gate insulation pattern and a first capacitance dielectric pattern, the first gate insulation pattern is disposed on the first semiconductor pattern, and the first capacitance dielectric pattern is disposed on the second semiconductor pattern. The second insulating layer includes a second gate insulation pattern and a second capacitance dielectric pattern, the second gate insulation pattern is disposed on the first gate insulation pattern, and the second capacitance dielectric pattern is disposed on the first capacitance dielectric pattern. The conductive pattern is disposed above the second semiconductor pattern and is clamped between the first capacitance dielectric pattern and the second capacitance dielectric pattern. The first conductive layer includes a gate and an electrode pattern, the gate is disposed on the second gate insulation pattern, and the electrode pattern is disposed on the second capacitance dielectric pattern. The first doping region and the second doping of the first conductive layer are exposed, and the contact portion of the second semiconductor layer is exposed. The passivation layer covers the metal oxide semiconductor layer and the first conductive layer and is provided with a first opening through which the first doping region of the first semiconductor pattern is exposed, a second opening through which the second doping region of the first semiconductor pattern is exposed, a third opening through which the contact portion is exposed, and a fourth opening through which the first electrode is exposed. The second conductive layer is disposed on the passivation layer and includes a first electrode and a second electrode, the first electrode is electrically connected with the first doping region of the first semiconductor pattern through the first opening, and the second electrode is electrically connected with the second doping region of the first semiconductor pattern through the second opening. The gate, the first semiconductor pattern, the first electrode and the second electrode constitute the active element, the second electrode is electrically connected with the contact portion of the second semiconductor pattern through the third opening, the second semiconductor pattern partially overlaps with the conductive pattern and is coupled with the conductive pattern to constitute one storage capacitor, and the conductive pattern partially overlaps with the electrode pattern and is coupled with the electrode pattern to constitute another storage capacitor. The pixel electrode is electrically connected with the second electrode.

In a further aspect, a layered structure usable for a pixel structure includes: a metal oxide semiconductor layer including a first semiconductor pattern and a second semiconductor pattern, where the first semiconductor pattern includes a first doping region, a second doping region and a channel region, the first doping region and the second doping region are disposed respectively on two sides of the channel region, and the second semiconductor pattern includes a contact portion and an electrode portion; a first conductive layer including a gate and an electrode pattern, where the gate is disposed above the first semiconductor pattern, and at least one gate insulation pattern is formed between the gate and the first semiconductor pattern; the electrode pattern is disposed above the second semiconductor pattern, and at least one capacitance dielectric pattern is formed between the electrode pattern and the second semiconductor pattern, such that the first doping region and the second doping region of the first semiconductor pattern are exposed, and the contact portion of the second semiconductor pattern is exposed; a passivation layer covering the metal oxide semiconductor layer and the first conductive layer and having a first opening through which the first doping region of the first semiconductor pattern is exposed, a second opening through which the second doping region of the first semiconductor pattern is exposed, a third opening through which the contact portion is exposed, and a fourth opening through which the electrode pattern is exposed; a second conductive layer disposed on the passivation layer and comprising a first electrode and a second electrode, wherein the first electrode is electrically connected to the first doping region of the first semiconductor pattern through the first opening; the second electrode is electrically connected to the second doping region of the first semiconductor pattern through the second opening; the gate of the first conductive layer, the first semiconductor pattern, the first electrode and the second electrode form an active element; the second electrode is electrically connected to the contact portion of the second semiconductor pattern through the third opening; and a pixel electrode electrically connected to the second electrode. In certain embodiments, the second semiconductor pattern, the electrode pattern and the second electrode are formed in a partially overlapping mode to form at least two storage capacitors therebetween.

In certain embodiments, the second conductive layer further includes a connection portion which is electrically connected to the electrode pattern of the first conductive layer through the fourth opening of the passivation layer.

In certain embodiments, the at least two storage capacitors include: a first storage capacitor formed by the second semiconductor pattern partially overlapping the electrode pattern of the first conductive layer; and a second storage capacitor formed by the second electrode partially overlapping the electrode pattern of the first conductive layer. In certain embodiments, the second electrode includes a second electrode extending portion partially overlapping the electrode pattern of the first conductive layer, wherein the second storage capacitor is formed by the second electrode extending portion and at least a portion of the electrode pattern.

In certain embodiments, the at least one gate insulation pattern formed between the gate and the first semiconductor pattern includes a first gate insulation pattern disposed on the first semiconductor pattern, and a second gate insulation pattern disposed between the gate and the first gate insulation pattern; and the at least one capacitance dielectric pattern formed between the electrode pattern and the second semiconductor pattern includes a first capacitance dielectric pattern disposed on the second semiconductor pattern and a second capacitance dielectric pattern disposed between the electrode pattern and the first capacitance dielectric pattern. In one embodiment, a conductive pattern is disposed above the second semiconductor pattern and between the first capacitance dielectric pattern and the second capacitance dielectric pattern, where the second semiconductor pattern partially overlaps the conductive pattern to form a third storage capacitor, and the conductive pattern partially overlaps the electrode pattern of the first conductive layer to form a fourth storage capacitor.

On this basis, the storage capacitors of the pixel structure may be achieved by stacking the multiple electrodes or the conductive pattern, and therefore the overall capacitance value of the storage capacitors can be effectively increased while achieving a good aperture ratio.

DETAILED DESCRIPTION OF THE DISCLOSURE

FIG. 1is an equivalent circuit diagram of the pixel structure of the organic light-emitting diode display panel according to an embodiment of the invention. Please refer toFIG. 1, the pixel structure of the organic light-emitting diode display panel includes an organic light-emitting diode OLED, a data line Yn, a scanning line Xn, a switch thin film transistor Ta, a driving thin film transistor Tb and a storage capacitor Cst. A gate G1of the switch thin film transistor Ta is coupled to the scanning line Xn, a first electrode S1is coupled to the data line Yn, and a second electrode D1is coupled to a gate G2of the driving thin film transistor Tb. A second electrode D2of the driving thin film transistor Tb is coupled to the organic light-emitting diode OLED, and a first electrode S2is coupled with a power line Vcc. An electrode at one end of the storage capacitor Cst is electrically connected with a second electrode D2of the driving thin film transistor Tb, and an electrode at the other end of the storage capacitor Cst is electrically connected with the second electrode D1of the switch thin film transistor Ta.

FIG. 2is a cross-sectional diagram of the pixel structure according to the first embodiment of the invention. Please refer toFIG. 2, in the embodiment, the pixel structure is disposed on a substrate100and includes a metal oxide semiconductor layer200, a first insulating layer300, a second insulating layer400, a first conductive layer500, a passivation layer600a, a second conductive layer700, a passivation layer800, and a pixel electrode900.

Specifically, the metal oxide semiconductor layer200includes a first semiconductor pattern220and a second semiconductor pattern240, wherein the first semiconductor pattern220includes a first doping region222, a second doping region224and a channel region226, and the second semiconductor pattern240includes a contact portion242and an electrode portion244. The metal oxide semiconductor layer200can be made of Indium-Gallium-Zinc Oxide, (IGZO), ZnO, SnO, Indium-Zinc Oxide (IZO), Gallium-Zinc Oxide (GZO), Zinc-Tin Oxide (ZTO) or Indium-Tin Oxide (ITO) or other suitable metal oxide semiconductor materials. The first doping region222, the second doping region224, and the contact portion242may be made of doped metal oxide semiconductor materials, for example, the metal oxide semiconductor materials doped with an n-type dopant, but the invention is not limited to these materials. In addition, the portions which are not doped with the materials in the metal oxide semiconductor layer200serve as a channel region226and the electrode portion244. The first doping region222and the second doping region224in the first semiconductor pattern220are disposed on the two sides of the channel region226respectively. The electrode portion244in the second semiconductor pattern240is disposed on one side of the contact portion242.

Please continue to refer toFIG. 2. The first insulating layer300, the second insulating layer400and the first conductive layer500are piled on the metal oxide semiconductor layer200. The first insulating layer300and the second insulating layer400are made of dielectric materials such as silicon oxide, silicon nitride or silicon oxynitride. The first conductive layer500is made of the materials such as metal or other suitable conductive materials. The first insulating layer300includes a first gate insulation pattern320and a first capacitance dielectric pattern340, the first gate insulation pattern320is disposed on the first semiconductor pattern220, and the first capacitance dielectric pattern340is disposed on the second semiconductor pattern240. The second insulating layer400includes a second gate insulation pattern420and a second capacitance dielectric pattern440, the second gate insulation pattern420is disposed on the first gate insulation pattern320, and the second capacitance dielectric pattern440is disposed on the first capacitance dielectric pattern340. The first conductive layer500includes a gate520and an electrode pattern540a, the gate520is disposed on the second gate insulation pattern420, and the electrode pattern540ais disposed on the second capacitance dielectric pattern440.

It is worth explaining that the first gate insulation pattern320and the second gate insulation pattern420in the embodiment are piled together to cover the channel region226of the first semiconductor pattern220, and therefore the first gate insulation pattern320and the second gate insulation pattern420are used for insulating the gate520and the channel region226and can further be used for protecting the material characteristics of the channel region226and the first gate insulation pattern320against influence of the follow-up process, respectively. Similar to the first gate insulation pattern320and the second gate insulation pattern420, the first capacitance dielectric pattern340and the second capacitance dielectric pattern440in the embodiment are piled together to cover the electrode portion244of the second semiconductor pattern240. The first capacitance dielectric pattern340and the second capacitance dielectric pattern440are used for insulating the electrode pattern540aand protecting the material characteristics of the electrode portion244and the first capacitance dielectric pattern340against influence of the follow-up process, respectively. The first gate insulation pattern320, the second gate insulation pattern420and the gate520in the embodiment are formed to expose the first doping region222and the second doping region224; the first capacitance dielectric pattern340, the second capacitance dielectric pattern440and the electrode pattern540aare formed to expose the contact portion242.

Next, the passivation layer600ais disposed on the first conductive layer500to cover the metal oxide semiconductor layer200, the first capacitance dielectric pattern340, the second capacitance dielectric pattern440and the first conductive layer500, and the passivation layer600ais provided with a plurality of openings602a,604a,606aand608a. The second conductive layer700is disposed on the passivation layer600a. Thus, the passivation layer600acan be used for insulating the second conductive layer700from the metal oxide semiconductor layer200and the first conductive layer500. The passivation layer600amay be an inorganic dielectric layer, which can be made of silicon oxide, silicon nitride, silicon oxynitride or other suitable materials, but is not limited by these materials. The second conductive layer700may be made of materials such as metal, or other suitable conductive materials.

The second conductive layer700includes a first electrode722and a second electrode724. The first electrode722can be electrically connected with the first doping region222of the first semiconductor pattern220through the corresponding opening602a, and the second electrode724can be electrically connected with the second doping region224of the first semiconductor pattern220through the corresponding opening604a. Thus, the gate520, the first semiconductor pattern220, the first electrode722and the second electrode724constitute an active element T1, namely the driving thin film transistor Tb inFIG. 1. Furthermore, the gate520of the active element T1is piled above the channel region226of the first semiconductor pattern220, and therefore the active element T1is in the form of a top gate type thin film transistor.

In addition, as shown inFIG. 2, the second conductive layer700further includes a second electrode extending portion742a. The second electrode extending portion742ais disposed to overlap the electrode pattern540a, the second electrode extending portion742ais electrically connected with the contact portion242of the second semiconductor pattern240through the corresponding opening606a, and thus the second electrode extending portion742ais electrically connected with the electrode portion244. As mentioned before, the electrode pattern540aoverlaps the electrode portion244. Thus, the electrode portion244, the electrode pattern540aand the second electrode extending portion742aconstitute a storage capacitor C1, namely the storage capacitor Cst as shown inFIG. 1.

Specifically, the second electrode724in the embodiment can extend to a position above the electrode pattern540awith the second electrode extending portion742a, where the second electrode724is connected with the second electrode extending portion742a. As mentioned before, the second electrode extending portion742ais electrically connected with the electrode portion244, and therefore the second electrode724, the electrode portion244and the second electrode extending portion742aare all at the same voltage. In addition, the second conductive layer700further includes a connection portion744a. In certain embodiments, the connection portion744amay be separately disposed from the second electrode extending portion742aand the second electrode724, and the connection portion744ais electrically connected with the electrode pattern540athrough the corresponding opening608a, and therefore the electrode pattern540acan provide a voltage different from that of the electrode portion244and the second electrode extending portion742a. Moreover, the electrode pattern540ais disposed between the electrode portion244and the second electrode extending portion742a, and therefore the storage capacitor C1is formed by series connection of a first sub-storage-capacitor C11and a second sub-storage-capacitor C12, wherein the first sub-storage-capacitor C11is formed by the second electrode extending portion742aand the electrode pattern540a, and the second sub-storage-capacitor C12is formed by the electrode portion244and the electrode pattern540a.

Furthermore, in the embodiment, the passivation layer800and a third conductive layer900are disposed on the second conductive layer700, and the third conductive layer900serves as the pixel electrode. The passivation layer800covers the second conductive layer700and the passivation layer600a, and the third conductive layer900is disposed on the passivation layer800. Thus, the passivation layer800is used for insulating the third conductive layer900from the second conductive layer700. The passivation layer800may be an organic planar layer, which can be made of the materials such as polyesters (PET), polyolefins, polyacylpropylenes, polycarbonates, polyalkylene oxides, polyphenylenes, polyethers, polyketones, polyalcohols and polyaldehydes or other suitable materials, but is not limited to these materials. The third conductive layer900may be made of the material such as metal.

After the pixel structure inFIG. 2is formed, please refer toFIG. 3if the pixel structure needs to be applied to the organic light-emitting display panel. Please refer toFIG. 2andFIG. 3at the same time, whereFIG. 3shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 2.

Specifically, the passivation layer1000is provided with an opening1002, and an organic layer1100of an organic light-emitting diode is disposed in the opening1002. A fourth conductive layer1200is disposed on the organic layer1100and the passivation layer1000. Thus, the fourth conductive layer1200and the third conductive layer900serve as two electrodes of the organic light-emitting diode, and the fourth conductive layer1200, the organic layer1100and the third conductive layer900constitute an organic light-emitting diode O1, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C1in the pixel structure can be achieved by stacking the first sub-storage-capacitor C11and the second sub-storage-capacitor C12, and therefore the capacitance value of the capacitor C1can be effectively increased under the condition of achieving a good aperture ratio. In addition, the storage capacitor C1and the active element T1of the pixel structure can be achieved on the same film layer, thus achieving the goal of effectively increasing the capacitance value of the storage capacitor C1without adding any processing steps.

FIG. 4is a cross-sectional diagram of the pixel structure according to the second embodiment of the invention. Please refer toFIG. 4, the pixel structure in the embodiment is similar to that as shown inFIG. 2, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 4and inFIG. 2is that the pixel structure of the embodiment as shown inFIG. 4further comprises a conductive pattern1300disposed above a second semiconductor pattern240and is clamped between the first capacitance dielectric pattern340and a second capacitance dielectric pattern440. In addition, the electrode pattern540bis electrically connected with the second electrode724and the second electrode extending portion742bthrough the opening606a. Furthermore, the pixel structure as shown inFIG. 4does not have the passivation layer800and the third conductive layer900as shown inFIG. 2.

As shown inFIG. 4, the second electrode extending portion742b, the electrode pattern540band the electrode portion244of the second semiconductor pattern240are arranged in an overlapping mode, and the second electrode extending portion742b, the second electrode724and the electrode pattern540bare electrically connected with the contact portion242of the second semiconductor pattern240through the opening606a, and therefore the second electrode extending portion742b, the electrode pattern540b, and the electrode portion244of the second semiconductor pattern240are all at the same voltage. Moreover, the second conductive layer700further includes the connection portion744b. In certain embodiments, the second electrode724and the second electrode extending portion742bmay be separately disposed from the connection portion744band the first electrode722, and the connection portion744bis electrically connected with the conductive pattern1300through an opening608a, such that the conductive pattern1300has a voltage different from that of the electrode portion244, the second electrode extending portion742band the electrode pattern540b. Thus, the electrode portion244of the second semiconductor pattern, the conductive pattern1300, the electrode pattern540band the second electrode extending portion742bconstitute a storage capacitor C2, namely the storage capacitor Cst as shown inFIG. 1.

In the embodiment, the conductive pattern1300is disposed between the electrode portion244and the electrode pattern540band between the electrode portion244and the second electrode extending portion742b, and therefore the storage capacitor C2is formed by a series connection of a first sub-storage-capacitor C21and a second sub-storage-capacitor C22, wherein the first sub-storage-capacitor C21is formed by the electrode pattern540band the conductive pattern1300, and the second sub-storage-capacitor C22is formed by the conductive pattern1300and the electrode portion244, and the storage capacitor of the pixel structure in the embodiment has a higher capacitance value compared with the pixel structure as shown inFIG. 2. In addition, in the embodiment, the second electrode extending portion742bis connected with the second electrode724, and the second electrode extending portion742bserves as the pixel electrode.

After the pixel structure inFIG. 4is formed, please refer toFIG. 5if the pixel structure needs to be applied to an organic light-emitting display panel. Please refer toFIG. 4andFIG. 5at the same time, whereFIG. 5shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 4. The organic layer1100of an organic light-emitting diode is disposed in an opening1002of the passivation layer1000. A fourth conductive layer1200is disposed on the organic layer1100and the passivation layer1000. The fourth conductive layer1200, the organic layer1100and the second electrode extending portion742bconstitute an organic light-emitting diode O2, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C2in the pixel structure can be achieved by stacking the first sub-storage-capacitor C21and the second sub-storage-capacitor C22, and therefore the capacitance value of the capacitor C2can be effectively increased under the condition of achieving a good aperture ratio.

FIG. 6is a cross-sectional diagram of the pixel structure according to the third embodiment of the invention. Please refer toFIG. 6, the pixel structure in the embodiment is similar to that as shown inFIG. 4, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 6and inFIG. 4is that a passivation layer600cin the embodiment as shown inFIG. 6is an organic planar layer.

Specifically, the passivation layer600cmay be made of materials such as polyesters (PET), polyolefins, polyacylpropylenes, polycarbonates, polyalkylene oxides, polyphenylenes, polyethers, polyketones, polyalcohols and polyaldehydes or other suitable materials, but is not limited to these materials. The first electrode722can be electrically connected with the first doping region222of the first semiconductor pattern220through an opening602cof the passivation layer600c, and the second electrode724can be electrically connected with the second doping region224of the first semiconductor pattern220through an opening604cof the passivation layer600c. The second electrode724, the second electrode extending portion742band the electrode pattern540bare electrically connected with the contact portion242of the second semiconductor pattern240through the opening606cThe second electrode724, the second electrode extending portion742b, the electrode pattern540band an electrode portion244of the second semiconductor pattern240are all at the same voltage. Moreover, the connection portion744bof the second conductive layer700is electrically connected with the conductive pattern1300through the opening608c, and therefore the conductive pattern1300can provide a voltage different from that of the electrode portion244, the second electrode extending portion742band the electrode pattern540b. Thus, the electrode portion244of the second semiconductor pattern240, the conductive pattern1300, the electrode pattern540band the second electrode extending portion742bconstitute a storage capacitor C3, namely the storage capacitor Cst as shown inFIG. 1. The storage capacitor C3is formed by a series connection of a first sub-storage-capacitor C31and a second sub-storage-capacitor C32, wherein the first sub-storage-capacitor C31is formed by the electrode pattern540band the conductive pattern1300, and the second sub-storage-capacitor C32is formed by the conductive pattern1300and the electrode portion244.

After the pixel structure inFIG. 6is formed, please refer toFIG. 7if the pixel structure needs to be applied to the organic light-emitting display panel. Please refer toFIG. 6andFIG. 7at the same time, whereFIG. 7shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 6. The fourth conductive layer1200, the organic layer1100and the second electrode extending portion742bconstitute an organic light-emitting diode O3, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material. When the fourth conductive layer1200is made of a translucent material, the passivation layer1000, the organic layer1100and the fourth conductive layer1200of the pixel structure as shown inFIG. 6constitute an upward light-emitting type organic light-emitting diode substrate. When the fourth conductive layer1200is made of a light-proof material, the passivation layer1000, the organic layer1100and the fourth conductive layer1200of the pixel structure as shown inFIG. 6constitute a downward light-emitting type organic light-emitting diode substrate.

FIG. 8is a cross-sectional diagram of the pixel structure according to the fourth embodiment of the invention. Please refer toFIG. 8, the pixel structure in the embodiment is similar to that as shown inFIG. 6, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 8and inFIG. 6is that a passivation layer800and a third conductive layer900are formed on the second conductive layer700of the pixel structure in the embodiment as shown inFIG. 8, and the third conductive layer900serves as the pixel electrode.

Specifically, the passivation layer800covers the second conductive layer700and a passivation layer600a, and the third conductive layer900is disposed on the passivation layer800. Thus, the passivation layer800is used for insulating the third conductive layer900from the second conductive layer700. The passivation layer800may be an organic planar layer, which is made of materials such as polyesters (PET), polyolefins, polyacylpropylenes, polycarbonates, polyalkylene oxides, polyphenylenes, polyethers, polyketones, polyalcohols and polyaldehydes or other suitable materials, but not limited to these materials. The third conductive layer900may be made of material like metal or other suitable conductive materials.

As shown inFIG. 8, the passivation layer800is provided with an opening1202d. The third conductive layer900, the second electrode extending portion742b, the electrode pattern540band the electrode portion244of the second semiconductor pattern240are disposed in an overlapping mode, and the third conductive layer900is connected with the second electrode724of the second conductive layer700through the opening1202d. The third conductive layer900, the second electrode extending portion742b, the electrode pattern540b, the second doping region224of the first semiconductor pattern220and the electrode portion244of the second semiconductor pattern240are all at the same voltage. Moreover, the conductive pattern1300can provide a voltage different from that of the electrode portion244, the second electrode extending portion742band the electrode pattern540b. Thus, the third conductive layer900, the electrode portion244of the second semiconductor pattern240, the conductive pattern1300, the electrode pattern540band the second electrode extending portion742bconstitute a storage capacitor C4, namely the storage capacitor Cst as shown inFIG. 1. The storage capacitor C4is formed by a series connection of a first sub-storage-capacitor C41, a second sub-storage-capacitor C42, a third second sub-storage-capacitor C43and a fourth sub-storage-capacitor C44, wherein the first sub-storage-capacitor C41is formed by the electrode pattern540band the conductive pattern1300, the second sub-storage-capacitor C42is formed by the conductive pattern1300and the electrode portion244, the third second sub-storage-capacitor C43is formed by the second electrode extending portion742band the conductive pattern1300, and the fourth sub-storage-capacitor C44is formed by the third conductive layer900and the conductive pattern1300.

After the pixel structure inFIG. 8is formed, please refer toFIG. 9if the pixel structure is required to be applied to the organic light-emitting display panel. Please refer toFIG. 8andFIG. 9at the same time, whereFIG. 9shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 8. The organic layer1100of an organic light-emitting diode is disposed in an opening1002of the passivation layer1000. The fourth conductive layer1200is disposed on the organic layer1100and the passivation layer1000. Thus, the fourth conductive layer1200, the organic layer1100and the third conductive layer900constitute an organic light-emitting diode O4, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C4in the pixel structure can be achieved by stacking the first sub-storage-capacitor C41, the second sub-storage-capacitor C42, the third sub-storage-capacitor C43and the fourth sub-storage-capacitor C44, and therefore the capacitance value of the capacitor C4can be effectively increased under the condition of achieving a good aperture ratio.

FIG. 10is a cross-sectional diagram of the pixel structure according to the fifth embodiment of the invention. Please refer toFIG. 10, the pixel structure in the embodiment is similar to that as shown inFIG. 8, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 8and inFIG. 10is that, as shown inFIG. 10, a connection portion744ein the embodiment is disposed to partially overlap the electrode pattern540b, and a third conductive layer900is disposed to overlap the connection portion744e.

Specifically, the third conductive layer900, the second electrode extending portion742b, the electrode pattern540b, and the electrode portion244of the second semiconductor pattern240are disposed in an overlapping mode, and the third conductive layer900, the second electrode extending portion742b, the electrode pattern540b, the second doping region224of the first semiconductor pattern220, and the electrode portion244of the second semiconductor pattern240are all at the same voltage. Moreover, the connection portion744eand the conductive pattern1300are both at the same voltage which is different from the voltage of the electrode portion244, the second electrode extending portion742band the electrode pattern540b. Thus, the third conductive layer900, the connection portion744e, the electrode pattern540b, the conductive pattern1300and the electrode portion244of the second semiconductor pattern240constitute a storage capacitor C5, namely the storage capacitor Cst as shown inFIG. 1. The storage capacitor C5is formed by a series connection of a first sub-storage-capacitor C51, a second sub-storage-capacitor C52, a third second sub-storage-capacitor C53and a fourth sub-storage-capacitor C54, wherein the first sub-storage-capacitor C51is formed by the electrode pattern540band the conductive pattern1300, the second sub-storage-capacitor C52is formed by the conductive pattern1300and the electrode portion244, the third second sub-storage-capacitor C53is formed by the electrode pattern540band the connection portion744e, and the fourth sub-storage-capacitor C54is formed by the third conductive layer900and the connection portion744e. It is worth mentioning that the stacking mode of the storage capacitor is that the third conductive layer900, the electrode pattern540band the electrode portion244of the second semiconductor pattern240are disposed to be staggered with the connection portion744eand the conductive pattern1300, wherein the electrode pattern540band the electrode portion244of the second semiconductor pattern240are at the same voltage, and the connection portion744eand the conductive pattern1300are at another same voltage.

After the pixel structure inFIG. 10is formed, please refer toFIG. 11if the pixel structure is required to be applied to the organic light-emitting display panel. Please refer toFIG. 10andFIG. 11at the same time, whereFIG. 11shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 10. The organic layer1100of an organic light-emitting diode is disposed in an opening1002of the passivation layer1000. The fourth conductive layer1200is disposed on the organic layer1100and the passivation layer1000. Thus, the fourth conductive layer1200, the organic layer1100and the third conductive layer900constitute an organic light-emitting diode O5, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C5in the pixel structure can be achieved by stacking the first sub-storage-capacitor C51, the second sub-storage-capacitor C52, the third sub-storage-capacitor C53and the fourth sub-storage-capacitor C54, and therefore the capacitance value of the capacitor C5can be effectively increased under the condition of achieving a good aperture ratio.

FIG. 12is a cross-sectional diagram of the pixel structure according to the sixth embodiment of the invention. Please refer toFIG. 12, the pixel structure in the embodiment is similar to that as shown inFIG. 8, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 8and inFIG. 12is that a passivation layer600fof the embodiment as shown inFIG. 12is an organic planar layer.

Specifically, the passivation layer600fmay be made of materials such as polyesters (PET), polyolefins, polyacylpropylenes, polycarbonates, polyalkylene oxides, polyphenylenes, polyethers, polyketones, polyalcohols and polyaldehydes or other suitable materials, but is not limited to these materials. The first electrode722can be electrically connected with the first doping region222of the first semiconductor pattern220through an opening602fof the passivation layer600f, and the second electrode724can be electrically connected with the second doping region224of the first semiconductor pattern220through an opening604fof the passivation layer600f. The third conductive layer900, the electrode portion244of the second semiconductor pattern240, the conductive pattern1300, the electrode pattern540band the second electrode extending portion742bconstitute a storage capacitor C6, namely the storage capacitor Cst as shown inFIG. 1. The storage capacitor C6is formed by a series connection of a first sub-storage-capacitor C61, a second sub-storage-capacitor C62, a third second sub-storage-capacitor C63and a fourth sub-storage-capacitor C64, wherein the first sub-storage-capacitor C61is formed by the electrode pattern540band the conductive pattern1300, the second sub-storage-capacitor C62is formed by the conductive pattern1300and the electrode portion244, the third second sub-storage-capacitor C63is formed by the second electrode extending portion742band the conductive pattern1300, and the fourth sub-storage-capacitor C64is formed by third conductive layer900and the conductive pattern1300.

After the pixel structure inFIG. 12is formed, please refer toFIG. 13if the pixel structure needs to be applied to the organic light-emitting display panel. Please refer toFIG. 12andFIG. 13at the same time, whereFIG. 13shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 12. The fourth conductive layer1200, the organic layer1100and the third conductive layer900constitute an organic light-emitting diode O6, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C6in the pixel structure can be achieved by stacking a first sub-storage-capacitor C61, a second sub-storage-capacitor C62, a third sub-storage-capacitor C63and a fourth sub-storage-capacitor C64, and therefore the capacitance value of the capacitor C6can be effectively increased under the condition of achieving a good aperture ratio.

FIG. 14is a cross-sectional diagram of the pixel structure according to the seventh embodiment of the invention. Please refer toFIG. 14, the pixel structure in the embodiment is similar to that as shown inFIG. 12, in which the similar components of the pixel structure are expressed by the same reference numbers and have similar functions, and therefore no explanation is repeated. The main difference between the pixel structures as shown inFIG. 14and inFIG. 12is that a connection portion744gof the embodiment as shown inFIG. 14is disposed to overlap an electrode pattern540b, and a third conductive layer900is disposed to overlap the connection portion744g.

Specifically, the third conductive layer900, the second electrode extending portion742b, the electrode pattern540b, the electrode portion244of the second semiconductor pattern240are disposed in an overlapping mode, and the third conductive layer900, the second electrode extending portion742b, the electrode pattern540b, and the electrode portion244of the second semiconductor pattern240are all at the same voltage. Moreover, the connection portion744gand the conductive pattern1300are at the same voltage which is different from the voltage of the electrode portion244, the second electrode extending portion742band the electrode pattern540b. Thus, the third conductive layer900, the connection portion744g, the electrode pattern540b, the conductive pattern1300and the electrode portion244of the second semiconductor pattern240constitute a storage capacitor C7, namely the storage capacitor Cst as shown inFIG. 1. The storage capacitor C7is formed by a series connection of a first sub-storage-capacitor C71, a second sub-storage-capacitor C72, a third second sub-storage-capacitor C73and a fourth sub-storage-capacitor C74, wherein the first sub-storage-capacitor C71is formed by the electrode pattern540band the conductive pattern1300, the second sub-storage-capacitor C72is formed by the conductive pattern1300and the electrode portion244, the third second sub-storage-capacitor C73is formed by the electrode pattern540band the connection portion744g, and the fourth sub-storage-capacitor C74is formed by the third conductive layer900and the connection portion744g. It is worth mentioning that the stacking mode of the storage capacitor C7is that the third conductive layer900, the electrode pattern540band the electrode portion244of the second semiconductor pattern240are disposed to be staggered with the connection portion744gand the conductive pattern1300, wherein the third conductive layer900, the electrode pattern540band the electrode portion244of the second semiconductor pattern240are at the same voltage, and the connection portion744gand the conductive pattern1300are at another same voltage.

After the pixel structure inFIG. 14is formed, please refer toFIG. 15if the pixel structure is required to be applied to the organic light-emitting display panel. Please refer toFIG. 14andFIG. 15at the same time, whereFIG. 15shows that a passivation layer1000, an organic layer1100and a fourth conductive layer1200are formed on the pixel structure as shown inFIG. 14. The organic layer1100of the organic light-emitting diode is disposed in an opening1002of the passivation layer1000. The fourth conductive layer1200is disposed on the organic layer1100and the passivation layer1000. Thus, the fourth conductive layer1200, the organic layer1100and the third conductive layer900constitute an organic light-emitting diode O7, namely the organic light-emitting diode OLED as shown inFIG. 1. Moreover, the fourth conductive layer1200can be made of a translucent or light-proof (opaque) conductive material.

It can be understood based on the above embodiment that the storage capacitor C7in the pixel structure can be achieved by stacking the first sub-storage-capacitor C71, the second sub-storage-capacitor C72, the second sub-storage-capacitor C73and the second sub-storage-capacitor C74, and therefore the capacitance value of the capacitor C7can be effectively increased under the condition of achieving a good aperture ratio.

In summary, the storage capacitor of the pixel structure is achieved by stacking the multiple electrodes or the conductive pattern, and therefore the capacitance value of the storage capacitor can be effectively increased under the condition of achieving the good aperture ratio. In addition, the storage capacitor and the active element of the pixel structure can be achieved on the same film layer, and therefore the aim of effectively increasing the capacitance value of the storage capacitor can be achieved under the condition without adding processing steps. Furthermore, when one conductive pattern is additionally disposed between the first capacitance dielectric pattern and the second capacitance dielectric pattern, the passivation layer and a fourth conductive layer are additionally disposed on the second conductive layer, or the fourth conductive layer, the first electrode and the electrode portion of the second semiconductor pattern are disposed to be staggered with the connection portion and the conductive pattern, wherein the first electrode and the electrode portion of the second semiconductor pattern have the same voltage, and the connection portion and the conductive pattern have another same voltage.