Liquid crystal display panel

Abstract

The utility model provides a liquid crystal display panel which comprises a TFT substrate, a CF substrate and liquid crystal arranged between the TFT substrate and the CF substrate, the liquid crystal display panel further comprises an anti-static structure, the anti-static structure comprises a first ITO layer, a spacer part and a second ITO layer, the first ITO layer is arranged on the side, close to the CF substrate, of the TFT substrate, the spacer part is arranged on the side, close to the CF substrate, of the first ITO layer, and the second ITO layer is arranged on the side, close to the CF substrate, of the second ITO layer. The spacer part is arranged on the side, close to the CF substrate, of the TFT substrate in a protruding mode, the second ITO layer is laid on the side face, close to the TFT substrate 10, of the CF substrate and the outer side face of the spacer part, so that the first ITO layer is laid on the whole face of the CF substrate, the first ITO layer and the second ITO layer are transparent electrodes ITO, and the first ITO layer and the second ITO layer are transparent electrodes ITO. The TFT substrate and the CF substrate face each other through the spacer, and the second ITO layer at the spacer on the side of the CF substrate is in contact conduction with the first ITO layer on the TFT substrate.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display panel manufacturing technology, and in particular to a liquid crystal display panel. Background Technology

[0002] Thin-film transistor liquid crystal displays (TFT-LCDs) are a common type of flat panel display. Their basic structure consists of two glass substrates with a layer of liquid crystal material sandwiched between them. A common voltage (COM) is typically located around the periphery of the TFT-LCD substrate. This voltage is crucial for maintaining the stable alignment of the liquid crystal molecules. However, as the size of TFT-LCD substrates increases, the impedance of the traces for the external reference voltage also increases. This can cause electrostatic discharge (ESD) on the panel, leading to instability in the COM signal and weak signal drive. Consequently, flickering, green screen artifacts, and other defects occur, affecting the display quality.

[0003] Therefore, how to enhance the stability of the reference voltage and improve the electrostatic discharge capability of the panel is one of the important issues in TFT-LCD. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a liquid crystal display panel to improve the stability of the enhanced reference voltage and enhance the electrostatic discharge capability of the panel.

[0005] This utility model provides a liquid crystal display panel, comprising: a TFT substrate, a CF substrate, and liquid crystal disposed between the TFT substrate and the CF substrate. The liquid crystal display panel further includes an anti-static structure, which includes a first ITO layer, a spacer portion, and a second ITO layer. The first ITO layer is disposed on the side of the TFT substrate near the CF substrate, and the spacer portion protrudes from the side of the TFT substrate near the CF substrate. The second ITO layer is disposed on the side of the CF substrate near the TFT substrate and the outer side of the spacer portion, such that the first ITO layer is disposed on the entire surface of the CF substrate. The first ITO layer and the second ITO layer are transparent electrode ITO. The TFT substrate and the CF substrate are aligned through the spacer. The second ITO layer at the spacer on the CF substrate side is in contact with and conductively connected to the first ITO layer on the TFT substrate.

[0006] Compared with the prior art, the display panel provided by this utility model can reduce the impedance of the reference circuit, improve the stability of the reference circuit, and enhance the electrostatic discharge capability of the display panel by setting an anti-static structure and combining it with the conduction of the common electrode CF COM and COM structure of the color filter substrate. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the COM structure architecture design of an embodiment of a liquid crystal display panel in the prior art.

[0008] Figure 2 This is a schematic diagram of the anti-static structure of a liquid crystal display panel according to one embodiment of this application.

[0009] Figure 3 A schematic diagram of the structure of a liquid crystal display panel with spacers according to one embodiment of this application.

[0010] Figure 4 (A)-(C) are schematic diagrams of the first to third examples of the COM structure layout of a liquid crystal display panel according to an embodiment of this application.

[0011] Figure 5 (A)-(C) are schematic diagrams illustrating the connection method between the COF board of the liquid crystal display panel and the first common signal line within the liquid crystal display panel according to an embodiment of this application.

[0012] Figure 6 This is a schematic diagram of an embodiment of a display panel according to one implementation of this application. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0015] refer to Figure 1 This is a schematic diagram of the architecture design of the COM structure of an embodiment of a liquid crystal display panel in the prior art. Figure 1The diagram shows a "||" type COM structure architecture design, where only one COM structure 110 is arranged on each of the left and right sides of the display panel. The reference voltage signal from the COF board can only be supplied through one COM structure 110. However, a single current path leads to high signal impedance in the reference circuit, weak signal drive, and an unstable COM structure architecture, making it prone to electrostatic discharge. In other existing technologies, to improve the signal impedance of the reference circuit, for example, the COM structure is designed to be thicker to reduce impedance and improve signal quality, but this affects the layout space of other lines. In other existing technologies, the driving capability of the COF is increased to enhance signal drive and ensure signal quality, but this may increase power consumption and manufacturing costs.

[0016] To address the aforementioned issues, this invention provides a liquid crystal display panel 100, which, by incorporating an anti-static structure and integrating the conduction of the color filter substrate common electrode CF COM and COM structure, reduces the impedance of the reference circuit, improves the stability of the reference circuit, and enhances the electrostatic discharge capability of the display panel.

[0017] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0018] One embodiment of this application provides a liquid crystal display panel 100, such as... Figure 2 (a) includes: TFT substrate 10, CF substrate 30, and liquid crystal (not shown) disposed between TFT substrate 10 and CF substrate 30.

[0019] The liquid crystal display panel 100 also includes an anti-static structure 50, which can release static electricity on the TFT substrate 10 to the CF substrate 30 to prevent damage to the TFT substrate 10.

[0020] The antistatic structure 50 includes a first ITO layer 51, a spacer portion 53, and a second ITO layer 55. The first ITO layer 51 is disposed on the side of the TFT substrate 10 closest to the CF substrate 30. The spacer portion 53 protrudes from the side of the TFT substrate 10 closest to the CF substrate 30; for example, it can be a spacer (PS) formed on the CF substrate 30 opposite to the TFT substrate 10, sealing the liquid crystal between the CF substrate 30 and the TFT substrate 10. The second ITO layer 55 covers the side of the CF substrate 30 closest to the TFT substrate 10 and the outer side of the spacer portion 53, such that the second ITO layer 55 is deposited on the entire surface of the CF substrate. The first ITO layer 51 and the second ITO layer 55 can be transparent electrode ITO. The TFT substrate 10 and the CF substrate 30 are aligned by the spacer PS.

[0021] like Figure 2 As shown in (a), if the spacer PS is not aligned with the TFT substrate 10 (does not contact it), the static electricity generated on the TFT substrate 10 can easily be conducted along the first ITO layer 51, causing damage to the electronic components of the TFT substrate 10 and resulting in unstable COM signals. Figure 2 As shown in (b), in the embodiment of this application, after the spacer PS and the TFT substrate 10 are aligned, the second ITO layer 55 at the spacer PS on the CF substrate 30 side makes contact with the first ITO layer 51 on the TFT substrate 10, thereby making the static electricity generated on the TFT substrate 10 flow through the first ITO layer 51 of the TFT substrate 10 to the second ITO layer 55 of the CF substrate 30. By dissipating the static electricity to the CF substrate 30 side, the ESD resistance of the panel is improved, the impedance of COM is reduced, and the stability of COM is improved.

[0022] A black matrix (BM), R / G / B primary color color resist (CR), and a transparent electrode ITO (not shown) are sequentially formed on the CF substrate 30. Among them, as shown... Figure 3 As shown, the entire surface of the CF substrate 30 is covered with an ITO layer (i.e., the color filter substrate common electrode CF COM), and the outer sidewall of the spacer PS is also continuously covered, thus the entire surface of the CF substrate 30 near the TFT substrate 10 is covered with an ITO layer. In this embodiment, the spacer PS is a structure formed by stacking a G color resist layer and a B color resist layer.

[0023] The TFT substrate 10 can be constructed by sequentially forming a conductor layer and a non-conductor layer on a glass substrate. The conductor layer sequentially includes a first metal layer M1, a hydrogenated amorphous silicon layer GI, and a second metal layer M2. The non-conductor layer sequentially includes an insulating layer PAS and a planarization layer JAS. The first metal layer M1 can be a gate metal layer, and the second metal layer M2 can be a source metal layer. A contact hole 20 is formed on the second metal layer M2 of the TFT substrate 10. The contact hole 20 is formed by removing the insulating layer PAS and the planarization layer JAS above the second metal layer M2, and an ITO layer is formed on the upper side and edge of the contact hole 20.

[0024] The positional relationship between the spacer PS and the TFT substrate 10 when they are aligned can be as follows: Figure 3Any one of the intersection (overall overlapping contact connection), tangency (contact point contact connection), and coincidence (partial overlapping contact connection) as shown. Thus, after the spacer PS abuts against the TFT substrate 10, the ITO of the transparent electrode at the spacer PS on the CF substrate 30 side contacts and conducts with the ITO layer at the contact hole 20, so that the static electricity generated on the TFT substrate 10 flows to the ITO of the CF substrate 30 via the ITO of the TFT substrate 10. Since the static electricity is discharged to the common electrode on the CF side, the ESD resistance of the panel is improved, the impedance of the common electrode is reduced, and the stability of the common voltage is improved.

[0025] In an embodiment of the present application, as Figure 4 shown, the TFT substrate 10 includes a display area 1 and a non-display area 2, and the non-display area 2 surrounds the display area 1.

[0026] Specifically, the non-display area 2 includes a first side A and a third side C arranged along the row direction, and a second side B and a fourth side D arranged along the column direction. The first side A and the third side C are oppositely arranged on opposite sides of the display area 1, and the second side B and the fourth side D are oppositely arranged on opposite sides of the display area 1.

[0027] A COF board 10 is provided on the first side A of the display panel. The COF board 10 is a PCB board, and it can be one or more, which is not limited herein.

[0028] In an embodiment of the present application, the anti-static structure 50 of the display panel further includes at least three COM lines 110 (the first metal layer M1 and the second metal layer M2). The at least three COM lines 110 are arranged in the non-display area 2 and surround the non-display area 2. The at least three COM lines 110 are sequentially connected to form structures such as "ㄇ", "凵", "口", etc., and at least one COM line 110 is connected to the COF board 10.

[0029] Specifically, in the first example of the COM structure layout of the liquid crystal display panel as shown in (A) of Figure 4 , the second side B, the third side C, and the fourth side D are provided with COM lines 110 at the same time. In the second example of the COM structure layout of the liquid crystal display panel as shown in (B) of Figure 4 , the first side A, the second side B, and the fourth side D are provided with COM lines 110 at the same time. In the example as shown in Figure 4In the third example of the COM structure layout of the liquid crystal display panel shown in (C), COM lines 110 are simultaneously provided on the first side A, the second side B, the third side C, and the fourth side D. Compared with the single current path formed on the left and right sides in the existing "||" type COM structure architecture design, the COM lines 110 on the left and right sides of the display panel of this application are electrically connected through at least one of the COM lines 110 on the first side A and the third side C, and the COM lines 110 are connected in parallel, thereby increasing the current path and reducing the signal impedance.

[0030] It should be noted that the COM lines 110 located on different sides can be formed on the same layer or on different layers. For example, they can be formed on different layers and connected via contact holes.

[0031] In the non-display area 2, a first peripheral common signal line 11 is provided around the display area 1. The first peripheral common signal line 11 includes the aforementioned multiple COM lines 110. The display area 1 is provided with a first common signal line 13.

[0032] The first common signal line 13 is connected to the COF board 10 through the first common signal pin 17 on the COF board 10, and the first peripheral common signal line 11 is connected to the COF board 10 through the first peripheral signal pin 15 on the COF board 10. The first common signal pin and the first peripheral signal pin are set independently.

[0033] In one embodiment of this application, the voltage signal transmitted from the COF board 10 to the first peripheral common signal line 11 via the first peripheral signal pin 15 can be any common electrode signal such as the array substrate common electrode signal ACOM, the color filter substrate common electrode signal CFCOM, or the pixel voltage common electrode LCSR-share COM.

[0034] The data line in the TFT substrate 10 charges the pixel electrode through a thin film transistor (TFT) so that the voltage of the pixel electrode reaches the target data voltage.

[0035] The color filter side common electrode (CF COM) of the CF substrate 30 is formed by sputtering indium tin oxide (ITO) over the entire surface. After the pixel electrode is charged, an electric field is formed between the pixel electrode and the color filter side common electrode to drive the liquid crystal to rotate, thereby controlling the backlight incident light and displaying different gray levels and colors.

[0036] The TFT substrate 10 and the CF substrate 30 are aligned by a spacer (PS).

[0037] At least one COF connection point is distributed on the TFT substrate 10 for connecting the COF board 10. The COF board 10 is disposed on one side of the non-display area 2 and includes multiple COFs, which are connected to at least one COF connection point.

[0038] In one embodiment of this application, such as Figure 5 As shown, the COF board 10 is connected to the first common signal line 13 of the display area 1 of the display panel 100 via the first common signal pin 17. The connection between each COF board 10 and the first common signal line 13 within the display panel 100 can be a single-sided connection or a double-sided connection. A single-sided connection means the COF board 10 is connected to the first common signal line 13 via the first common signal pin 17 on one side; a double-sided connection means the COF board 10 is connected to the first common signal line 13 via the first common signal pins 17 on both sides. The reference voltage signal transmitted by the COF board 10 to the display area 1 of the display panel can be any common electrode signal such as the array substrate common electrode signal ACOM, the color filter substrate common electrode signal CF COM, or the pixel voltage common electrode LCSR-share COM. Figure 5 As shown, in the anti-static structure of the display panel, the COF board 10 can be connected to the first common signal line 13 within the display panel entirely via a single-sided connection, entirely via a double-sided connection, or a hybrid single-sided / double-sided connection. The design of this application allows for adjustment of the number of COF connections and the arrangement of single-sided / double-sided connections according to actual needs, offering high flexibility and adaptability, and reducing manufacturing costs and design complexity. Compared to existing technologies, it better meets the needs of TFT-LCD substrates of different sizes and models.

[0039] In one embodiment of this application, the COM line 110 can be connected to multiple common electrode lines extending from the first common signal line 13 to the COM line 110 at multiple locations. Specifically, the common electrode lines and the COM line 110 are disposed on different layers, and the COM line 110 is electrically connected to the multiple common electrode lines through multiple contact holes. The display panel 100 achieves ITO electrical connection between the color filter substrate common electrode CF COM and the COM structure by using a spacer PS on the color filter substrate side and a contact hole 20 on the COM line 110. Specifically, due to the structure of the spacer PS protruding from one side of the CF substrate 30, after being aligned with the TFT substrate 10, the spacer PS contacts (via hole ITO contact) the contact hole 20 disposed on the COM line 110 of the TFT substrate 10, thus achieving conductivity. Since the CF substrate 30 side is fully covered with ITO, after the CF COM and COM line 110 on the entire surface are connected, it is equivalent to the COM line 110 and CF COM being short-circuited together, thereby reducing the impedance of the common electrode. When the ESD electron gun is used, the static electricity can be discharged to the common electrode on the CF side, thereby improving the panel's ESD resistance, reducing the impedance of the common electrode, and improving the stability of the common voltage.

[0040] Furthermore, the COM lines 110 in the first to third examples of the COM structure layout in one embodiment of this application can be arbitrarily combined with the single-sided / double-sided connection between the COF board 10 and the first common signal line 13 in the display panel, and the contact between the transparent electrode ITO at the spacer PS on the color filter substrate side and the ITO layer of the contact hole 20 on the common electrode line of the array substrate. For example, in one embodiment of this application, such as Figure 6 As shown, in the third example of the COM structure layout, COM lines 110 are simultaneously provided on the first side A, the second side B, the third side C, and the fourth side D. The first common signal line 13 of the display area 1 also includes multiple first common electrode lines 131 extending along the row direction (e.g., Figure 6 (as shown by the dashed line along the row direction) and multiple second common electrode lines 132 extending along the column direction (as shown by the dashed line along the row direction). Figure 6 As shown by the dashed lines along the column direction, the first common electrode line 131 and the second common electrode line 132 can be located on different layers, and the first common electrode line 131 and the second common electrode line 132 can be located on different layers from the COM line 110 on the periphery of the display panel. In this embodiment, the COM line 110 on the first side A and the third side C are electrically connected to the second common electrode line 132 through the contact hole 20, and the COM line 110 on the second side B and the fourth side D are electrically connected to the first common electrode line 131 through the contact hole 20. The structure of the electrical connection through the contact hole can be referred to Figure 2 and Figure 3The structure is shown. Based on this, since each COM line 110 is interconnected, the first common electrode line 131 can be connected to the second common electrode line 132 through multiple points (contact holes). After the first common electrode line 131 and the second common electrode line 132 are connected, the overall impedance of the common electrode is reduced. When electrostatic discharge occurs, the electrostatic discharge can be released to the common electrode on the color filter substrate side, thereby improving the anti-electrostatic discharge capability of the display panel, reducing the impedance of the common electrode, and improving the stability of the reference voltage.

[0041] Furthermore, it is understandable that even if the antistatic structure adopts... Figure 4 The arrangement shown in (A) and (B) includes three COM lines 110. Since each COM line 110 can be interconnected, the first common electrode line 131 and the second common electrode line 132 can also be interconnected.

[0042] In addition, in this embodiment, at the intersection of the connection line between the COF board 10 and the first common signal line 13 in the display panel and the COM structure of the first side A, a spacer PS is placed above the contact hole 20 at the metal bridge, which increases the contact points between the common electrode in the display panel and the COM line 110, and further reduces the impedance of the reference circuit.

[0043] In summary, the display panel of this application places a spacer PS at the contact hole 20 where the metal bridge between the peripheral COM line 110 and the first common electrode line 131 or the second common electrode line 132 is located. This allows the transparent electrode ITO at the spacer PS to contact the ITO layer of the contact hole 20. Furthermore, by providing COM lines 110 on at least three sides of the periphery, compared to the prior art which provides a single current path by setting a COM structure on each of the left and right sides of the periphery of the display panel, the display panel of this application achieves conduction between the common electrode line and the common electrode CF COM of the color filter substrate. This enables the reference circuit to achieve a parallel circuit structure, reduces the impedance of the reference circuit, improves the stability of the reference circuit, and enhances the electrostatic discharge capability of the display panel.

[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A liquid crystal display panel comprising: A TFT substrate, a CF substrate, and liquid crystal disposed between the TFT substrate and the CF substrate, characterized in that, The liquid crystal display panel further comprises an anti-static structure, The anti-static structure comprises a first ITO layer, a spacer portion, and a second ITO layer, The first ITO layer is disposed on the side of the TFT substrate close to the CF substrate, The spacer portion is protrudingly disposed on the side of the TFT substrate close to the CF substrate, The second ITO layer is laid on the side of the CF substrate close to the TFT substrate and the outer side of the spacer portion, so that the second ITO layer is laid on the entire surface of the CF substrate, The first ITO layer and the second ITO layer are transparent electrodes ITO, The TFT substrate and the CF substrate are butted by the spacer, The second ITO layer at the spacer on the side of the CF substrate is in contact with the first ITO layer on the TFT substrate.

2. The liquid crystal display panel according to claim 1, characterized by The TFT substrate is configured to sequentially form a conductor layer and a non-conductor layer on a glass substrate, The non-conductor layer is provided with a contact hole in a manner that the conductor layer leaks out of the non-conductor layer through the contact hole, The second ITO layer is generated on the upper side of the contact hole and the edge of the contact hole, When the TFT substrate and the CF substrate are butted by the spacer, The first ITO layer at the spacer on the side of the CF substrate is in contact with the second ITO layer at the contact hole and is electrically connected with the conductor layer.

3. The liquid crystal display panel of claim 2, characterized in that, The spacer and the contact hole are in any one of intersecting, tangential, and coinciding position relationship.

4. The liquid crystal display panel according to claim 2, wherein The liquid crystal display panel comprises a display area and a non-display area, the non-display area is disposed along the four sides of the display area, the non-display area comprises a first side and a third side disposed opposite along a row direction, and a second side and a fourth side disposed opposite along a column direction, The anti-static structure is disposed on the non-display area, the anti-static structure comprises a COF plate disposed on the first side, and a COM line disposed on at least three sides of the non-display area, the COM line is a part of the conductor layer, The COM line on at least one side is connected with the COF plate, and the COF plate provides a voltage signal for the COM line.

5. The liquid crystal display panel of claim 4, characterized in that, The display area is provided with a first common signal line, a plurality of common electrode lines extend from the first common signal line to the COM line, the common electrode lines and the COM line are disposed in different layers, and the COM line is electrically connected with the plurality of common electrode lines through a plurality of contact holes.

6. The liquid crystal display panel according to claim 5, wherein The first common signal line is connected to the COF plate through a first common signal pin disposed on the COF plate, A first peripheral common signal line surrounding the display area is disposed in the non-display area, and the first peripheral common signal line comprises a plurality of COM lines, The first peripheral common signal line is connected to the COF plate through a first peripheral signal pin arranged on the COF plate, and the first common signal pin and the first peripheral signal pin are arranged independently.

7. The liquid crystal display panel of claim 6, wherein, Each of the COF plates is connected to the first common signal line in a single-side connection or a double-side connection.

8. The liquid crystal display panel of claim 7, wherein, The plurality of COM lines include three COM lines, which are arranged in sequence and surround three sides of the display area.

9. The liquid crystal display panel of claim 7, wherein, The plurality of COM lines include four COM lines, which are arranged in sequence and surround four sides of the display area.

10. The liquid crystal display panel of claim 4, wherein, The signal transmitted by the COF plate to the COM line is any one of an array substrate common electrode signal, a color film substrate common electrode signal, or a pixel voltage common electrode.

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