阅读说明：本技术 显示面板及其制备方法 (Display panel and preparation method thereof ) 是由 黄雨田 宋辉 于 2019-08-28 设计创作，主要内容包括：本发明提供一种显示面板及其制备方法,通过定量蚀刻所述第一接触区以及所述第二接触区的所述保护层,使得所述第一通孔以及所述第二通孔接触所述有源层的表面,并且所述源漏极金属层可以通过第一通孔以及所述第二通孔连接所述有源层,并没有使用HFC对所述保护层进行清洗,这有效的防止所述第一电容电极以及所述第二电容电极被HF腐蚀,从而获得稳定的TFT电性参数。(The invention provides a display panel and a preparation method thereof, wherein the protective layers of the first contact area and the second contact area are quantitatively etched, so that the first through hole and the second through hole are in contact with the surface of the active layer, the source and drain electrode metal layer can be connected with the active layer through the first through hole and the second through hole, and the protective layer is not cleaned by HFC (hybrid fiber coax), so that the first capacitor electrode and the second capacitor electrode are effectively prevented from being corroded by HF (hydrogen fluoride), and stable TFT (thin film transistor) electrical parameters are obtained.)

1. A display panel, comprising:

a flexible substrate;

the active layer is arranged on the flexible substrate and is provided with a first contact region, a second contact region and a functional region connected with the first contact region and the second contact region;

the protective layer is arranged on one side, away from the flexible substrate, of the active layer;

a first insulating layer disposed on the active layer and the flexible substrate;

the first capacitor electrode is arranged on one side, far away from the flexible substrate, of the first insulating layer;

a second insulating layer provided on the first capacitor electrode and the first insulating layer;

the second capacitor electrode is arranged on one side, far away from the first insulating layer, of the second insulating layer;

an interlayer insulating layer provided on the second capacitor electrode and the second insulating layer;

the source drain metal layer is arranged on one side, far away from the second insulating layer, of the interlayer insulating layer;

the interlayer insulating layer is provided with a first through hole and a second through hole;

the first through hole corresponds to the first contact region and penetrates through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to reach the surface of the active layer;

the second through hole corresponds to the second contact region and penetrates through the interlayer insulating layer, the second insulating layer, part of the first insulating layer and the protective layer to reach the surface of the active layer.

2. The display panel according to claim 1,

the source drain metal layer comprises a source electrode and a drain electrode;

the source electrode is connected with the first contact region through the first through hole;

the drain is connected to the second contact region through the second via.

3. The display panel according to claim 1, characterized in that:

the first capacitive electrode and the second capacitive electrode each include:

a first metal layer;

the second metal layer is arranged on the first metal layer;

the third metal layer is arranged on the second metal layer far away from the first metal layer;

the first metal layer and the third metal layer are made of metal titanium;

the second metal layer is made of metal aluminum.

4. The display panel according to claim 1,

the protective layer is made of silicon oxide;

the thickness of the protective layer is 40-50 angstroms meters.

5. The display panel according to claim 1,

the active layer is made of polycrystalline silicon;

the thickness of the active layer is 400-410 angstrom meters.

6. The display panel according to claim 1,

the flexible substrate includes:

a substrate;

the first base layer is arranged on the substrate;

the barrier layer is arranged on one side, far away from the substrate, of the first base layer;

the second base layer is arranged on one side, far away from the first base layer, of the barrier layer;

the buffer layer is arranged on one side, far away from the barrier layer, of the second base layer;

the middle layer is arranged on one side, far away from the second base layer, of the buffer layer.

7. The display panel according to claim 1, further comprising:

the planarization layer is arranged on the source drain metal layer and the interlayer insulating layer;

the first electrode is arranged on one side, far away from the interlayer insulating layer, of the planarization layer;

a pixel defining layer disposed on the first electrode and the planarization layer;

the first electrode is connected with the source drain metal layer, the pixel defining layer is provided with a slot, and the surface of the first electrode is exposed out of the slot;

and the pixel limiting block is arranged on the pixel defining layer and surrounds the groove.

8. The display panel according to claim 7, further comprising:

the first electrode is connected with the source drain metal layer.

9. A method for manufacturing a display panel includes:

providing a flexible substrate;

depositing an active layer on the flexible substrate, wherein the active layer is provided with a first contact region, a second contact region and a functional region connected with the first contact region and the second contact region;

forming a protective layer on the active layer;

depositing a first insulating layer on the active layer and the flexible substrate;

depositing a first capacitor electrode on the first insulating layer;

depositing a second insulating layer on the first capacitor electrode and the first insulating layer;

depositing a second capacitor electrode on the second insulating layer;

depositing an interlayer insulating layer on the second capacitor electrode and the second insulating layer;

forming a first through hole penetrating through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to the surface of the active layer in the first contact region; forming a second through hole penetrating through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to the surface of the active layer in the second contact region; and pre-cleaning the first through hole in the first contact area, and pre-cleaning the second through hole in the second contact area.

10. The method of claim 9, further comprising sequentially depositing a source-drain metal layer, a planarization layer, a first electrode, a pixel defining layer, and a pixel defining block on the interlayer insulating layer.

Technical Field

The invention relates to the field of display, in particular to a display panel and a preparation method thereof.

Background

The low-temperature polysilicon active matrix organic light emitting diode (LTPS-AMOLED) display device is characterized in that a stress concentration area is arranged at a position where an interlayer dielectric layer (ILD) covers a Gate Electrode (GE) step, cracking easily occurs under the condition of multiple bending, cracks can be generated and vertically spread at the position of the interlayer dielectric layer, the Young modulus of metal aluminum (Al) is about 1/5 of molybdenum (Mo), if the current molybdenum is replaced by a titanium/aluminum/titanium laminated structure for a first capacitor electrode and a second capacitor electrode, namely, the gate electrode and a source drain electrode metal layer both adopt a titanium/aluminum/titanium laminated structure with smaller Young modulus, cracking can be effectively prevented during bending, the bending life of the device is prolonged, meanwhile, the resistivity of aluminum is smaller and is only half of that of molybdenum, and a double-gate metal formed by hydrogen-active integration below the aluminum recrystallization temperature has lower resistance value, because the structure of the source-drain electrode metal layer is also titanium/aluminum/titanium, the contact surface of the source-drain electrode metal layer and the upper and lower electrode plates of the double-grid electrode metal capacitor can also obtain smaller resistance value, thereby obtaining a thin film transistor circuit with more excellent electrical property.

Disclosure of Invention

The present invention is directed to a display panel and a method for manufacturing the same, in which the protective layer of the first contact region and the protective layer of the second contact region are quantitatively etched, so that the first via hole and the second via hole contact the surface of the active layer, and the protective layer is not cleaned by HFC, which effectively prevents the first capacitor electrode and the second capacitor electrode from being corroded by HF, thereby obtaining stable TFT electrical parameters.

In order to achieve the above object, the present invention provides a display panel including: a flexible substrate; the active layer is arranged on the flexible substrate and is provided with a first contact region, a second contact region and a functional region connected with the first contact region and the second contact region; the protective layer is arranged on one side, away from the flexible substrate, of the active layer; a first insulating layer disposed on the active layer and the flexible substrate; the first capacitor electrode is arranged on one side, far away from the flexible substrate, of the first insulating layer; a second insulating layer provided on the first capacitor electrode and the first insulating layer; the second capacitor electrode is arranged on one side, far away from the first insulating layer, of the second insulating layer; an interlayer insulating layer provided on the second capacitor electrode and the second insulating layer; the source drain metal layer is arranged on one side, far away from the second insulating layer, of the interlayer insulating layer; the interlayer insulating layer is provided with a first through hole and a second through hole; the first through hole corresponds to the first contact region and penetrates through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to reach the surface of the active layer; the second through hole corresponds to the second contact region and penetrates through the interlayer insulating layer, the second insulating layer, part of the first insulating layer and the protective layer to reach the surface of the active layer.

Further, the source drain metal layer comprises a source electrode and a drain electrode; the source electrode is connected with the first contact region through the first through hole; the drain is connected to the second contact region through the second via.

Further: the first capacitive electrode and the second capacitive electrode each include: a first metal layer; the second metal layer is arranged on the first metal layer; the third metal layer is arranged on the second metal layer far away from the first metal layer; the first metal layer and the third metal layer are made of metal titanium; the second metal layer is made of metal aluminum.

Further, the protective layer is made of silicon oxide; the thickness of the protective layer is 40-50 angstroms meters.

Further, the material of the active layer is polysilicon; the thickness of the active layer is 400-410 angstrom meters.

Further, the flexible substrate includes: a substrate; the first base layer is arranged on the substrate; the barrier layer is arranged on one side, far away from the substrate, of the first base layer; the second base layer is arranged on one side, far away from the first base layer, of the barrier layer; the buffer layer is arranged on one side, far away from the barrier layer, of the second base layer; the middle layer is arranged on one side, far away from the second base layer, of the buffer layer.

Further, still include: the planarization layer is arranged on the source drain metal layer and the interlayer insulating layer; the first electrode is arranged on one side, far away from the interlayer insulating layer, of the planarization layer; a pixel defining layer disposed on the first electrode and the planarization layer; the first electrode is electrically connected with the source drain metal layer, the pixel defining layer is provided with a slot, and the slot exposes the surface of the first electrode; and the pixel limiting block is arranged on the pixel defining layer and surrounds the groove.

Further, the first electrode is connected with the source drain metal layer.

The invention also provides a preparation method of the display panel, which comprises the following steps: providing a flexible substrate; depositing an active layer on the flexible substrate, wherein the active layer is provided with a first contact region, a second contact region and a functional region connected with the first contact region and the second contact region; forming a protective layer on the active layer; depositing a first insulating layer on the active layer and the flexible substrate; depositing a first capacitor electrode on the first insulating layer; depositing a second insulating layer on the first capacitor electrode and the first insulating layer; depositing a second capacitor electrode on the second insulating layer; depositing an interlayer insulating layer on the second capacitor electrode and the second insulating layer; forming a first through hole penetrating through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to the surface of the active layer in the first contact region; forming a second through hole penetrating through the interlayer insulating layer, the second insulating layer, a part of the first insulating layer and the protective layer to the surface of the active layer in the second contact region; and pre-cleaning the first through hole in the first contact area, and pre-cleaning the second through hole in the second contact area.

Furthermore, the method also comprises the step of sequentially depositing a source drain metal layer, a planarization layer, a first electrode, a pixel definition layer and a pixel definition block on the interlayer insulating layer.

The invention has the beneficial effects that: the invention provides a display panel and a preparation method thereof, wherein the protective layers of the first contact area and the second contact area are quantitatively etched, so that the first through hole and the second through hole are in contact with the surface of the active layer, the source and drain electrode metal layer can be connected with the active layer through the first through hole and the second through hole, and the protective layer is not cleaned by HFC (hybrid fiber coax), so that the first capacitor electrode and the second capacitor electrode are effectively prevented from being corroded by HF (hydrogen fluoride), and stable TFT (thin film transistor) electrical parameters are obtained.

Drawings

The invention is further described below with reference to the figures and examples.

Fig. 1 is a schematic structural diagram of a display panel according to the present invention;

FIG. 2 is a schematic structural diagram of a flexible substrate provided in the present invention;

a display panel 100;

a flexible substrate 101; an active layer 102; a protective layer 103;

a first insulating layer 104; a first capacitance electrode 105; a second insulating layer 106;

a second capacitance electrode 107; an interlayer insulating layer 108; a planarization layer 110;

a source drain metal layer 109; a substrate 1011; a first base layer 1012;

a barrier layer 1013; a second base layer 1014; a buffer layer 1015;

an intermediate layer 1016; a drain stage 1092; a first electrode 111;

a pixel defining layer 112; a pixel defining block 113; a first contact region 1021;

a second contact region 1023; a functional region 1022; an open slot 1121;

a first through hole 1081; a second through hole 1082; and a source 1091.

Detailed Description

The following description of the embodiments refers to the accompanying drawings for illustrating the specific embodiments in which the invention may be practiced. Directional phrases used herein, such as, for example, upper, lower, front, rear, left, right, inner, outer, lateral, etc., refer only to the orientation of the accompanying drawings. The names of the elements, such as the first, the second, etc., mentioned in the present invention are only used for distinguishing different elements and can be better expressed. In the drawings, elements having similar structures are denoted by the same reference numerals.

Embodiments of the present invention will be described in detail herein with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided to explain the practical application of the invention and to enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present invention provides a display panel 100, comprising: the semiconductor device includes a flexible substrate 101, an active layer 102, a protective layer 103, a first insulating layer 104, a first capacitor electrode 105, a second insulating layer 106, a second capacitor electrode 107, an interlayer insulating layer 108, and a source/drain metal layer 109.

As shown in fig. 2, the flexible substrate 101 includes: a substrate 1011, a first base layer 1012, a barrier layer 1013, a second base layer 1014, a buffer layer 1015, and an intermediate layer 1016.

The first base layer 1012 is disposed on the substrate 1011; the material of the first base layer 1012 is polyimide. The barrier layer 1013 is disposed on a side of the first base layer 1012 away from the substrate 1011.

The second base layer 1014 is disposed on a side of the barrier layer 1013 away from the first base layer 1012; the material of the second base layer 1014 is polyimide.

The buffer layer 1015 is disposed on a side of the second base layer 1014 away from the barrier layer 1013.

The intermediate layer 1016 is disposed on a side of the buffer layer 1015 away from the second base layer 1014; the intermediate layer 1016 generally serves as an adhesive and may protect the flexible substrate 101.

As shown in fig. 1, the active layer 102 is disposed on the flexible substrate 101, and the active layer 102 has a first contact region 1021, a second contact region 1023, and a functional region 1022 connecting the first contact region 1021 and the second contact region 1023.

The material of the active layer 102 is polysilicon; the thickness of the active layer 102 is 400-410 angstrom meters.

The protective layer 103 is arranged on one side of the active layer 102 away from the flexible substrate 101; the material of the protective layer 103 is silicon oxide; the thickness of the protective layer 103 is 40-50 angstrom meters.

The protective layer 103 is formed by O₃A compact oxide film formed by oxidizing the polysilicon.

The first insulating layer 104 is disposed on the active layer 102 and the flexible substrate 101; the first capacitor electrode 105 is disposed on a side of the first insulating layer 104 away from the flexible substrate 101.

The second insulating layer 106 is disposed on the first capacitor electrode 105 and the first insulating layer 104; the second capacitor electrode 107 is disposed on a side of the second insulating layer 106 away from the first insulating layer 104.

The interlayer insulating layer 108 is provided on the second capacitor electrode 107 and the second insulating layer 106. The interlayer insulating layer 108 has a first via 1081 and a second via 1082.

The first via 1081 corresponds to the first contact region 1021 and extends through the interlayer insulating layer 108, the second insulating layer 106, a portion of the first insulating layer 104, and the protection layer 103 to the surface of the active layer 102.

The second through hole 1082 corresponds to the second contact region 1023 and penetrates the interlayer insulating layer 108, the second insulating layer 106, a portion of the first insulating layer 104, and the protection layer 103 to the surface of the active layer 102.

The source-drain metal layer 109 is disposed on a side of the interlayer insulating layer 108 away from the second insulating layer 106, and the source-drain metal layer 109 includes a source 1091 and a drain 1092.

In the invention, the protective layer 103 of the first contact region 1021 and the second contact region 1023 is quantitatively etched, so that the first via 1081 and the second via 1082 expose the surface of the active layer 102, and the source/drain metal layer 109 can be connected to the active layer 102 through the first via 1081 and the second via 1082 without cleaning the protective layer 103 with HFC, which effectively prevents the first capacitor electrode 105 and the second capacitor electrode 107 from being corroded by HF, thereby obtaining stable TFT electrical parameters.

The source 1091 is connected to the first contact region 1021 through the first via 1081; the drain 1092 is connected to the second contact area 1023 through the second through hole 1082.

The first capacitance electrode 105 and the second capacitance electrode 107 each include: a first metal layer, a second metal layer, and a third metal layer.

The second metal layer is arranged on the first metal layer; the third metal layer is arranged on the second metal layer far away from the first metal layer.

The first metal layer and the third metal layer are made of metal titanium; the second metal layer is made of metal aluminum. Because the Young modulus of Al is about 1/5 of Mo, the fracture can be effectively prevented, and the bending life of the device can be prolonged; meanwhile, the resistivity of Al is small and is only half of that of Mo, and the first capacitor electrode 105 and the second capacitor electrode 107 have a low resistance value after hydrogen and hydrogen are integrated below the recrystallization temperature of Al.

The display panel 100 further includes: a planarization layer 110, a first electrode 111, a pixel defining layer 112, and a pixel defining block 113.

The planarization layer 110 is disposed on the source/drain metal layer 109 and the interlayer insulating layer 108; the first electrode 111 is disposed on a side of the planarization layer 110 away from the interlayer insulating layer 108, and the first electrode 111 is an anode made of indium tin oxide. The first electrode 111 is connected to the source/drain metal layer 109.

The pixel defining layer 112 is disposed on the first electrode 111 and the planarization layer 110; the pixel defining layer 112 has a trench 1121, and the trench 1121 exposes the surface of the first electrode 111.

The pixel defining block 113 is disposed on the pixel defining layer 112 and surrounds the trench 1121.

The invention also provides a preparation method of the display panel, which comprises the following steps:

s1) providing a flexible substrate 101; the flexible substrate 101 includes: a substrate 1011, a first base layer 1012, a barrier layer 1013, a second base layer 1014, a buffer layer 1015, and an intermediate layer 1016.

The first base layer 1012 is disposed on the substrate 1011; the material of the first base layer 1012 is polyimide. The barrier layer 1013 is disposed on a side of the first base layer 1012 away from the substrate 1011. The second base layer 1014 is disposed on a side of the barrier layer 1013 away from the first base layer 1012; the material of the second base layer 1014 is polyimide. The buffer layer 1015 is disposed on a side of the second base layer 1014 away from the barrier layer 1013; the intermediate layer 1016 is disposed on a side of the buffer layer 1015 away from the second base layer 1014; the intermediate layer 1016 generally serves as an adhesive and may protect the flexible substrate 101.

S2) depositing an active layer 102 on the flexible substrate 101, the active layer 102 having a first contact region 1021, a second contact region 1023, and a functional region 1022 connecting the first contact region 1021 and the second contact region 1023.

The material of the active layer 102 is polysilicon; the thickness of the active layer 102 is 400-410 angstrom meters.

S3) forming a passivation layer 103 on the active layer 102; the protective layer 103 is arranged on one side of the active layer 102 away from the flexible substrate 101; the material of the protective layer 103 is silicon oxide; the thickness of the protective layer 103 is 40-50 angstrom meters.

The protective layer 103 is formed by O₃A compact oxide film formed by oxidizing the polysilicon.

S4) depositing a first insulating layer 104 on the active layer 102 and the flexible substrate 101.

S5) depositing a first capacitor electrode 105 on the first insulating layer 104.

S6) depositing a second insulating layer 106 on the first capacitor electrode 105 and the first insulating layer 104.

S7) depositing a second capacitor electrode 107 on the second insulating layer 106.

The first capacitance electrode 105 and the second capacitance electrode 107 include: a first metal layer, a second metal layer, and a third metal layer.

The second metal layer is arranged on the first metal layer; the third metal layer is arranged on the second metal layer far away from the first metal layer.

The first metal layer and the third metal layer are made of metal titanium; the second metal layer is made of metal aluminum. Because the Young modulus of Al is about 1/5 of Mo, the fracture can be effectively prevented, and the bending life of the device can be prolonged; meanwhile, the resistivity of Al is small and is only half of that of Mo, and the first capacitor electrode 105 and the second capacitor electrode 107 have a low resistance value after hydrogen and hydrogen are integrated below the recrystallization temperature of Al.

S8) depositing an interlayer insulating layer 108 on the second capacitor electrode 107 and the second insulating layer 106.

S9) forming a first via 1081 through the interlayer insulating layer 108, the second insulating layer 106, a portion of the first insulating layer 104, and the protection layer 103 to a surface of the active layer 102 at the first contact region 1021.

S10) forming a second via 1082 penetrating the interlayer insulating layer 108, the second insulating layer 106, a portion of the first insulating layer 104, and the protective layer 103 to the surface of the active layer 102 in the second contact area 1023, pre-cleaning the first via 1081 in the first contact area 1021, and pre-cleaning the second via 1082 in the second contact area 1023. The pre-cleaning treatment mode adopts pre-cleaning equipment for cleaning, and has the function of removing organic matters and particles on the surface of the glass.

The pre-cleaning equipment mainly comprises: extreme ultraviolet lithography UNIT (EUV UNIT): by ultraviolet irradiation, oxygen free radicals are generated to break organic bonds to generate small molecules, and O reacts with the small molecules to decompose into CO₂And H₂O; DE/RB Unit: removing particles and organic pollutants on the surface of the substrate by using a cleaning agent through the contact friction between the rotation of the brush and the surface of the substrate; SWR unit: cleaning with deionized water to remove particles; BJ/MJK Unit: through two-fluid flushing, bubbles on the surface of the substrate are broken to generate instant local high-pressure acting force, and particles on the surface of the substrate are flushed away; an HPMJ/FR unit for ultrahigh pressure cleaning and direct water treatment to remove particles; A/K unit: the substrate is completely dried by spraying dry air through the air knife.

S11) sequentially depositing a source-drain metal layer 109, a planarization layer 110, a first electrode 111, a pixel defining layer 112, and a pixel defining block 113 on the interlayer insulating layer 108.

According to the invention, the protective layer 103 of the first contact region 1021 and the second contact region 1023 is quantitatively etched, so that the first via 1081 and the second via 1082 contact the surface of the active layer 102, and the source/drain metal layer 109 can be connected to the active layer 102 through the first via 1081 and the second via 1082 without cleaning the protective layer 103 with HFC, which effectively prevents the first capacitor electrode 105 and the second capacitor electrode 107 from being corroded by HF, thereby obtaining stable TFT electrical parameters.

It should be noted that many variations and modifications of the embodiments of the present invention fully described are possible and are not to be considered as limited to the specific examples of the above embodiments. The above examples are intended to be illustrative of the invention and are not intended to be limiting. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.