Display substrate, manufacturing method thereof, and display panel

Abstract

The present disclosure provides a display substrate, the display substrate includes a plurality of pixel units arranged in multiple rows and columns, the pixel units include pixel circuits, the pixel circuits include driving transistors, switching transistors, sensing transistors and compensation capacitors, characterized in that in the same pixel circuit, the sensing transistor, the driving transistor and the switching transistor are located on the same side of the compensation capacitor, and the first electrode of the sensing transistor is electrically connected to the first electrode of the compensation capacitor via a capacitor connection line extending toward the compensation capacitor. The present disclosure also provides a display panel and a method for manufacturing a display substrate.

Description

Technical Field

[0001] The present disclosure relates to the field of display devices, and in particular, to a display substrate, a display panel including the display substrate, and a method for manufacturing the display substrate. Background Art

[0002] Organic light emitting diode display panels have been widely used due to their good light emitting performance, especially large-sized display panels, most of which have organic light emitting diode display panels.

[0003] As the resolution of display panels increases, the requirements for the light-emitting performance of display panels are becoming higher and higher. Summary of the invention

[0004] The present disclosure aims to provide a display substrate, a display panel including the display substrate, and a method for manufacturing the display substrate.

[0005] As a first aspect of the present disclosure, a display substrate is provided, comprising a plurality of pixel units arranged in a plurality of rows and columns, wherein the pixel units comprise pixel circuits, wherein the pixel circuits comprise driving transistors, switching transistors, sensing transistors and compensation capacitors, wherein in the same pixel circuit, the sensing transistors, the driving transistors and the switching transistors are located on the same side of the compensation capacitor, and a first electrode of the sensing transistor is electrically connected to a first electrode of the compensation capacitor via a capacitor connection line extending toward the compensation capacitor.

[0006] Optionally, the display substrate includes a base substrate, the layer where the first electrode of the compensation capacitor is located is formed on the base substrate, the capacitor connection line is arranged in the same layer as the first electrode of the compensation capacitor, and in the same layer, a gap is arranged between the first electrode of the compensation capacitor and the capacitor connection line located in the same pixel unit,

[0007] The display substrate also includes a shading metal graphic layer, which is arranged on the side of the first pole of the compensation capacitor away from the base substrate. The shading metal graphic layer includes a plurality of metal connectors, each of the intervals corresponds to one metal connector, and the metal connectors electrically connect the first pole of the compensation capacitor and the capacitor connecting line respectively located on both sides of the corresponding interval.

[0008] Optionally, the first electrode of the compensation capacitor and the capacitor connecting line are made of transparent electrode material.

[0009] Optionally, the display substrate further includes an active graphic layer, the active graphic layer includes an active layer of the sensing transistor, an active layer of the switching transistor, and an active layer of the driving transistor, and the capacitor connection line is located between the active layer of the switching transistor and the base substrate.

[0010] Optionally, the active graphic layer further includes a second electrode of the compensation capacitor.

[0011] Optionally, an orthographic projection of the active layer of the switch transistor on the substrate at least partially overlaps with a capacitor connection line in the same pixel unit.

[0012] Optionally, along a column direction of the pixel unit, the switch transistor is arranged between the driving transistor and the sensing transistor.

[0013] Optionally, the display substrate further includes a light-emitting element layer, the light-emitting element layer includes a plurality of organic light-emitting diodes, the plurality of pixel units correspond one-to-one to the plurality of organic light-emitting diodes, and the first electrode of the driving transistor is electrically connected to the anode of the corresponding organic light-emitting diode.

[0014] As a second aspect of the present disclosure, a display panel is provided, comprising a display substrate and a packaging cover for packaging the display substrate, wherein the display substrate is the display substrate provided in the first aspect of the present disclosure.

[0015] As a third aspect of the present disclosure, a method for manufacturing a display substrate is provided, wherein the display substrate is the display substrate provided in the first aspect of the present disclosure, and the manufacturing method comprises:

[0016] providing a substrate base plate;

[0017] Forming a first transparent pattern, wherein the first transparent pattern includes a first electrode of a compensation capacitor and a capacitor connecting line;

[0018] forming an insulating spacer layer;

[0019] A second transparent pattern is formed, wherein the second transparent pattern includes a second electrode of the compensation capacitor, and an active pattern, wherein the active pattern includes an active layer of a driving transistor, an active layer of a switching transistor, and an active layer of a sensing transistor, wherein the active layer of the driving transistor, the active layer of the switching transistor, and the active layer of the sensing transistor in a same pixel unit are located on the same side of the first electrode of the compensation capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 is a schematic structural diagram of a display substrate in the related art;

[0022] Figure 2 is a schematic structural diagram of an embodiment of a display substrate provided by the present disclosure;

[0023] Figure 3 is a flow chart of an embodiment of the manufacturing method provided by the present disclosure;

[0024] Figure 4 is a schematic diagram after the first transparent pattern is formed;

[0025] Figure 5 is a schematic diagram after the light-shielding metal pattern layer is formed;

[0026] Figure 6 is a schematic diagram after the second transparent graphic layer is formed;

[0027] Figure 7 is a schematic diagram after the gate pattern layer is formed;

[0028] Figure 8 This is a schematic diagram after the via is formed;

[0029] Fig. 9 This is a schematic diagram after the interlayer insulating layer is formed. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] like Figure 1 As shown, in the related art, the display substrate includes a plurality of pixel units, and the pixel unit includes a pixel circuit. Optionally, the pixel unit is a 3T1C pixel circuit, that is, the pixel circuit includes a sensing transistor 110, a driving transistor 120, a switching transistor 130 and a compensation capacitor 200, and the compensation capacitor 200 includes a first electrode 210 and a second electrode 220. The sensing transistor 110 is located on one side of the compensation capacitor 200, the switching transistor 130 and the driving transistor 120 are respectively located on both sides of the compensation capacitor 200, and the first electrode of the sensing transistor 110 is electrically connected to the first electrode of the compensation capacitor 200 through a capacitor connection line 111.

[0032] like Figure 1As shown in , the capacitor connection line 111 is located in the pixel opening of the pixel unit. Even if the capacitor connection line 111 is made of a transparent electrode material (ie, ITO material), it still affects the transmittance of the entire pixel unit, thereby reducing the light emitting quality of the light emitting element.

[0033] In view of this, as one aspect of the present disclosure, a display substrate is provided, wherein the display substrate comprises a plurality of pixel units arranged in a plurality of rows and columns, wherein the pixel units comprise pixel circuits, such as Figure 2 As shown, the pixel circuit includes a driving transistor 120, a switching transistor 130, a sensing transistor 110 and a compensation capacitor 200, wherein in the same pixel circuit, the sensing transistor 110, the driving transistor 120 and the switching transistor 130 are located on the same side of the compensation capacitor 200, and the first electrode of the sensing transistor 110 is electrically connected to the first electrode 210 of the compensation capacitor 200 through a capacitor connection line 111 extending toward the compensation capacitor 200.

[0034] The pixel circuit is used to drive the light-emitting element to emit light.

[0035] In the display substrate provided by the present disclosure, the driving transistor 120, the switching transistor 130, and the sensing transistor 110 in the pixel circuit are all located on the same side of the compensation capacitor 200, which results in the capacitor connection line 111 no longer being Figure 1 The blank area in the pixel opening of the pixel unit is not passed through as in the related art shown in the figure, but is located on the same side of the pixel opening as other wirings, so that the pixel opening in the display substrate provided by the present invention has a relatively large blank area, the light-emitting area of ​​the light-emitting element is no longer blocked, and the light-emitting quality of the display panel including the display substrate is improved.

[0036] It should be noted that in the present disclosure, the first electrode 210 and the second electrode of the compensation capacitor 200 are both made of transparent materials. As an optional implementation, the first electrode 210 can be made of a transparent electrode material.

[0037] The display substrate may further include a base substrate on which the pixel circuit is formed.

[0038] In the present disclosure, there is no particular limitation on the relative positional relationship between the capacitor connection line 111 and the first electrode 210. As an optional implementation, the capacitor connection line 111 and the first electrode 210 are located in the same layer and are both made of transparent electrode materials.

[0039] As an optional implementation, the capacitor connection line 111 may be formed as one body with the first electrode 210. To facilitate patterning and improve the electrical connection performance between the capacitor connection line 111 and the first electrode 210, optionally, the layer where the first electrode of the compensation capacitor 200 is located is formed on the base substrate, and the capacitor connection line 111 is arranged in the same layer as the first electrode 210 of the compensation capacitor 200. In the same layer, a gap is arranged between the first electrode 210 of the compensation capacitor 200 and the capacitor connection line 111 located in the same pixel unit.

[0040] At the same time, the display substrate also includes a shading metal graphic layer, which is arranged on the side of the first pole 210 of the compensation capacitor 200 away from the base substrate, and the shading metal graphic layer includes a plurality of metal connectors 300, each of the intervals corresponds to a metal connector 300, and the metal connectors 300 electrically connect the first pole 210 of the compensation capacitor 200 and the capacitor connecting line 111 respectively located on both sides of the corresponding interval.

[0041] Another important function of setting the light-shielding metal pattern layer is to shield the active layer of each transistor to prevent channel failure caused by light. Accordingly, in addition to electrically connecting the first electrode 210 to the capacitor connection line 111, the metal connector 300 can also shield the active layer. In other words, the metal connector 300 has two functions, which can reduce manufacturing costs and improve manufacturing efficiency.

[0042] As described above, the display substrate further includes an active graphic layer, and accordingly, the active graphic layer includes an active layer of the sensing transistor 110, an active layer of the switching transistor 130, and an active layer of the driving transistor 120. As an optional implementation, the capacitor connection line 111 is located between the active layer of the switching transistor 130 and the base substrate.

[0043] In the present disclosure, there is no special limitation on the second electrode of the compensation capacitor 200 . As an optional implementation, the active pattern layer further includes the second electrode 220 of the compensation capacitor 200 .

[0044] As shown above, the capacitor connection line is located between the active layer of the switch transistor 130 and the substrate. In order to facilitate patterning, the active layer of the switch transistor 130 is not a simple rectangle. Figure 2In the embodiment shown in , the active layer of the switch transistor 130 includes two parts located on both sides of the first pole of the switch transistor 130, and the length is relatively long. As an optional embodiment, the positive projection of the active layer of the switch transistor 130 on the substrate at least partially overlaps with the capacitor connection line 111 in the same pixel unit. In this way, during the entire process of manufacturing the display substrate, the capacitor connection line 111 formed on the substrate is repeatedly heated. During this process, the heat radiated by the capacitor connection line 111 can perform heat treatment on at least a part of the active layer of the switch transistor 130 corresponding to the capacitor connection line 111, reduce the resistance level of the active layer of the switch transistor 130, and thus improve the switching performance of the switch transistor 130. The second pole of the switch transistor is electrically connected to the gate of the driving transistor 120. Since the switching performance of the switch transistor 130 is improved, the performance of charging the gate of the driving transistor 120 is improved, thereby improving the luminous performance of the light-emitting element driven by the pixel circuit.

[0045] In addition, although the capacitor connection line 111 is made of a transparent electrode material, it still has a certain light shielding performance, so the capacitor connection line 111 can also shield the active layer of the switch transistor 130 to a certain extent.

[0046] In the present disclosure, there is no special requirement for the relative position relationship between the sensing transistor 110, the driving transistor 120 and the switch transistor 130 in the same pixel unit. For the convenience of patterning, optionally, in the column direction ( Figure 2 The switch transistor 130 is disposed between the driving transistor 120 and the sensing transistor 110 .

[0047] The display substrate is used in a display panel, and therefore, the display substrate further includes a light-emitting element layer. As an optional embodiment, the light-emitting element layer includes a plurality of organic light-emitting diodes, the plurality of pixel units correspond to the plurality of organic light-emitting diodes one by one, and the first electrode of the driving transistor 120 is electrically connected to the anode of the corresponding organic light-emitting diode.

[0048] As a second aspect of the present disclosure, a display panel is provided, comprising a display substrate and a packaging cover for packaging the display substrate, wherein the display substrate is the display substrate provided in the first aspect of the present disclosure.

[0049] As shown above, in the display substrate provided by the present disclosure, the driving transistor 120, the switching transistor 130, and the sensing transistor 110 in the pixel circuit are all located on the same side of the compensation capacitor 200, which results in the capacitor connection line 111 no longer being Figure 1The blank area in the pixel opening of the pixel unit is not passed through as in the related art shown in the figure, but is located on the same side of the pixel opening as other wirings, so that the pixel opening in the display substrate provided by the present invention has a relatively large blank area, the light-emitting area of ​​the light-emitting element is no longer blocked, and the light-emitting quality of the display panel including the display substrate is improved.

[0050] As an optional implementation, the display panel may be a 95 8k display panel.

[0051] As a third aspect of the present disclosure, a method for manufacturing the display substrate according to the first aspect of the present disclosure is provided, such as Figure 3 As shown, the manufacturing method comprises:

[0052] In step S110, a substrate is provided;

[0053] In step S120, a first transparent pattern is formed, wherein the first transparent pattern includes a first electrode of a compensation capacitor and a capacitor connecting line (see Figure 4 );

[0054] In step S130, an insulating spacer layer is formed;

[0055] In step S140, a second transparent pattern is formed (see Figure 6 ), the second transparent pattern includes a second electrode of the compensation capacitor, and an active pattern, the active pattern includes an active layer of a driving transistor, an active layer of a switching transistor, and an active layer of a sensing transistor, wherein the active layer of the driving transistor, the active layer of the switching transistor, and the active layer of the sensing transistor in the same pixel unit are located on the same side of the first electrode of the compensation capacitor.

[0056] In the present disclosure, the first transparent pattern may be made of a transparent electrode material ITO, and the second transparent pattern may be made of an IGZO material.

[0057] As described above, the first electrode of the compensation capacitor and the capacitor connection line may be electrically connected through a metal connector. Therefore, the manufacturing method may further include the following steps between step S120 and step S140:

[0058] Steps for forming a metal pattern layer (see Figure 5 ).

[0059] It should be pointed out that the above-mentioned manufacturing method is used to form the above-mentioned display substrate provided by the present disclosure. Although not described separately, the display substrate also includes a gate pattern layer and a source-drain pattern layer.

[0060] Therefore, after step S140, the manufacturing method may further include a step of forming a gate pattern layer (see Figure 7 ).

[0061] After the step of forming the gate pattern layer, the manufacturing method may further include:

[0062] Steps for forming a via pattern layer (see Figure 8 );

[0063] Steps for forming an interlayer insulating layer (see Fig. 9 );

[0064] Steps for forming source and drain pattern layers (see Figure 2 ).

[0065] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display substrate, comprising a plurality of pixel units arranged in a plurality of rows and columns, wherein the pixel units comprise a pixel circuit, wherein the pixel circuit comprises a driving transistor, a switching transistor, a sensing transistor and a compensation capacitor, wherein: In the same pixel circuit, the sensing transistor, the driving transistor and the switching transistor are located on the same side of the compensation capacitor, and the first electrode of the sensing transistor is electrically connected to the first electrode of the compensation capacitor through a capacitor connecting line extending toward the compensation capacitor; the display substrate includes a base substrate, the layer where the first electrode of the compensation capacitor is located is formed on the base substrate, the capacitor connecting line and the first electrode of the compensation capacitor are arranged in the same layer, and in the same layer, a gap is arranged between the first electrode of the compensation capacitor and the capacitor connecting line located in the same pixel unit, The display substrate further comprises a light-shielding metal graphic layer, the light-shielding metal graphic layer is arranged on a side of the first electrode of the compensation capacitor away from the base substrate, the light-shielding metal graphic layer comprises a plurality of metal connectors, each of the intervals corresponds to one of the metal connectors, and the metal connectors electrically connect the first electrodes of the compensation capacitors and the capacitor connection lines respectively located on both sides of the corresponding intervals; The display substrate also includes an active graphic layer, which includes an active layer of the sensing transistor, an active layer of the switching transistor, an active layer of the driving transistor, and a second electrode of the compensation capacitor. The capacitor connecting line is located between the active layer of the switching transistor and the base substrate. The active graphic layer is made of a transparent material.

2. The display substrate according to claim 1, characterized in that: The first electrode of the compensation capacitor and the capacitor connecting line are made of transparent electrode material.

3. The display substrate according to claim 1, characterized in that: The orthographic projection of the active layer of the switch transistor on the substrate at least partially overlaps with the capacitor connection line in the same pixel unit.

4. The display substrate according to any one of claims 1 to 3, characterized in that: Along the column direction of the pixel unit, the switch transistor is arranged between the driving transistor and the sensing transistor.

5. The display substrate according to any one of claims 1 to 3, characterized in that: The display substrate further includes a light emitting element layer, the light emitting element layer includes a plurality of organic light emitting diodes, the plurality of pixel units correspond to the plurality of organic light emitting diodes one by one, and the first electrode of the driving transistor is electrically connected to the anode of the corresponding organic light emitting diode.

6. A display panel, comprising a display substrate and a packaging cover for packaging the display substrate, characterized in that: The display substrate is the display substrate according to any one of claims 1 to 5.

7. A method for manufacturing a display substrate, characterized in that: The display substrate is the display substrate according to any one of claims 1 to 5, and the manufacturing method comprises: providing a substrate base plate; Forming a first transparent pattern, wherein the first transparent pattern includes a first electrode of a compensation capacitor and a capacitor connecting line; forming an insulating spacer layer; A second transparent pattern is formed, wherein the second transparent pattern includes a second electrode of the compensation capacitor, and an active pattern, wherein the active pattern includes an active layer of a driving transistor, an active layer of a switching transistor, and an active layer of a sensing transistor, wherein the active layer of the driving transistor, the active layer of the switching transistor, and the active layer of the sensing transistor in a same pixel unit are located on the same side of the first electrode of the compensation capacitor.

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