CN114488632B - Display panel, display device and detection method thereof - Google Patents

Display panel, display device and detection method thereof Download PDF

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Publication number
CN114488632B
CN114488632B CN202210101025.5A CN202210101025A CN114488632B CN 114488632 B CN114488632 B CN 114488632B CN 202210101025 A CN202210101025 A CN 202210101025A CN 114488632 B CN114488632 B CN 114488632B
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Prior art keywords
pad
area
binding
display panel
pads
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CN114488632A (en
Inventor
贾龙
钟本顺
金慧俊
戴超
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals

Abstract

The embodiment of the invention discloses a display panel, a display device and a detection method thereof. The display panel comprises a display area and a frame area; the frame area comprises a first binding area and a second binding area; the display area comprises a plurality of signal lines, and first ends of the signal lines extend to the first binding area; the frame area comprises a plurality of first wires, the first binding area comprises a plurality of first binding pads, the second binding area comprises a plurality of second binding pads, the first ends of the first wires are electrically connected with the first binding pads, and the second ends of the first wires are electrically connected with the second binding pads; the frame area further comprises a plurality of second wires and a plurality of dummy pads, the first ends of the second wires extend to the first binding area, the second ends are electrically connected with the dummy pads, the second wires are located between two adjacent first wires, and the dummy pads are located between two adjacent second binding pads. According to the technical scheme provided by the embodiment of the invention, the influence of short circuit of adjacent signal lines or coupling between the signal lines on the display panel can be avoided.

Description

Display panel, display device and detection method thereof
Technical Field
The embodiment of the invention relates to a display technology, in particular to a display panel, a display device and a detection method thereof.
Background
With the development of display technologies, various display technologies are continuously emerging, and various flat panel display devices including such as a liquid crystal display panel (LCD), an organic light emitting display panel (OLED), a Plasma Display Panel (PDP), an electrophoretic display panel (EPD), and the like have been developed.
The display panel comprises a display area and a frame area, wherein the display area is provided with pixel units for displaying pictures, and the frame area is provided with related control circuits for controlling the display of the pixel units, such as a driving chip connected with the display area through signal lines. In the prior art, signals required by the operation of the driving chip are connected to a flexible circuit board (FPC) through leads on the display panel, if two adjacent signals are key signals inside the driving chip, short circuit is caused by processing problems or influence on display or touch of the display panel is caused by coupling or interference between signal wires, so that abnormal signal transmission is caused and normal operation of the display panel is influenced.
Disclosure of Invention
The embodiment of the invention provides a display panel, a display device and a detection method thereof, which are used for avoiding short circuit of adjacent signal lines or influence of coupling between the signal lines on the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a display area and a border area surrounding the display area;
the frame area comprises a first binding area and a second binding area, and the first binding area is positioned between the display area and the second binding area;
the display area comprises a plurality of signal lines, and first ends of the signal lines extend to the first binding area;
the frame area comprises a plurality of first wires, the first binding area comprises a plurality of first binding pads, the second binding area comprises a plurality of second binding pads, the first ends of the first wires are electrically connected with the first binding pads, and the second ends of the first wires are electrically connected with the second binding pads;
the frame area further comprises a plurality of second wires and a plurality of dummy pads, the first ends of the second wires extend to the first binding area, the second ends of the second wires are electrically connected with the dummy pads, the second wires are located between two adjacent first wires, the dummy pads are located in the second binding area, and the dummy pads are located between two adjacent second binding pads.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel described above.
In a third aspect, an embodiment of the present invention further provides a method for detecting a display device, which is applicable to the above display device, where a frame area of a display panel includes a first detection pad, a second detection pad, and a detection trace, and the detection method includes:
and loading a test signal to the second binding pad, and detecting whether the second binding pad is short-circuited or not according to the output signal of the first detection pad.
The display panel provided by the embodiment of the invention comprises a display area and a frame area surrounding the display area; the frame area comprises a first binding area and a second binding area, and the first binding area is positioned between the display area and the second binding area; the display area comprises a plurality of signal lines, and first ends of the signal lines extend to the first binding area; the frame area comprises a plurality of first wires, the first binding area comprises a plurality of first binding pads, the second binding area comprises a plurality of second binding pads, the first ends of the first wires are electrically connected with the first binding pads, and the second ends of the first wires are electrically connected with the second binding pads; the frame area further comprises a plurality of second wires and a plurality of dummy pads, the first ends of the second wires extend to the first binding areas, the second ends of the second wires are electrically connected with the dummy pads, the second wires are located between two adjacent first wires, the dummy pads are located in the second binding areas, and the dummy pads are located between two adjacent second binding pads. By arranging the second wires between two adjacent first wires and arranging the dummy bonding pads between two adjacent second bonding pads, the short circuit of the adjacent first wires or the two adjacent second bonding pads due to the processing problem can be avoided; the second wiring is electrically connected with the corresponding dummy bonding pad, so that a shielding effect can be achieved on signals between the two adjacent first wirings and the two adjacent second bonding pads, normal operation of the display panel is prevented from being influenced due to abnormal signal transmission, and the performance of the display panel is improved.
Drawings
FIG. 1 is a schematic diagram of a display panel in the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic partial structure of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a partial structure of a display panel according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a partial structure of a display panel according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a partial structure of a display panel according to another embodiment of the present invention;
FIG. 9 is a schematic diagram of a partial structure of a display panel according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another display device according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present invention are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in the context, it will also be understood that when an element is referred to as being formed "on" or "under" another element, it can be directly formed "on" or "under" the other element or be indirectly formed "on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for any order, quantity, or importance, but rather are used to distinguish between different components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic structural diagram of a display panel in the prior art. Referring to fig. 1, the display panel includes a display area 01 and a frame area 02, wherein the display area 01 is provided with a plurality of pixel units (not shown in fig. 1) arranged in an array, the pixel units may include sub-pixels with a plurality of colors for emitting light, for example, red sub-pixels, blue sub-pixels and blue sub-pixels, and the three sub-pixels emit light with corresponding colors to realize color display of the display panel. A certain frame (for example, a lower frame is shown in fig. 1) of the frame area 02 is provided with a first binding area 03 and a second binding area 04, wherein the first binding area 03 is used for binding a driving chip 05, the driving chip 04 is connected with a pixel unit in the display area 01, the second binding area 04 is used for binding a flexible circuit board FPC 06, and the other end of the FPC 06 can be bent to the back of the display panel to be connected with a main board of the display device.
The driving chip 05 is bound with the display panel through a first binding pad 031 disposed in the first binding region 03, the FPC 06 is bound with the display panel through a second binding pad 041 disposed in the second binding region 04, and the corresponding first binding pad 031 and second binding pad 041 are connected through a trace 07 disposed in the display panel, wherein only two first binding pads 031 and two second binding pads 041 are schematically shown in fig. 1. Although two adjacent wires 07 or two adjacent second bonding pads 041 are spaced apart by a certain distance during design, a short circuit may be caused in the manufacturing process due to reasons such as manufacturing process, for example, a short circuit between two adjacent wires 07 or two adjacent second bonding pads 041, especially, as the resolution of the display panel is improved or the display panel has more functions (such as touch control), the number of signal wires of the display panel is more, and a short circuit phenomenon may occur due to reasons such as unreasonable layout of wires or pads. In addition, when two wires 07 with a relatively short distance transmit different signals, the coupling effect of the two wires may affect the signals, so that the signals transmitted to the display panel are inconsistent with the preset signals, and the performance of the display panel is affected.
In order to solve the above problems, the display panel provided by the embodiment of the invention comprises a display area and a frame area surrounding the display area; the frame area comprises a first binding area and a second binding area, and the first binding area is positioned between the display area and the second binding area; the display area comprises a plurality of signal lines, and first ends of the signal lines extend to the first binding area; the frame area comprises a plurality of first wires, the first binding area comprises a plurality of first binding pads, the second binding area comprises a plurality of second binding pads, the first ends of the first wires are electrically connected with the first binding pads, and the second ends of the first wires are electrically connected with the second binding pads; the frame area further comprises a plurality of second wires and a plurality of dummy pads, the first ends of the second wires extend to the first binding areas, the second ends of the second wires are electrically connected with the dummy pads, the second wires are located between two adjacent first wires, the dummy pads are located in the second binding areas, and the dummy pads are located between two adjacent second binding pads.
Fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention. Referring to fig. 2, the display panel includes a display area 10 and a frame area 20 surrounding the display area 10, wherein the display area includes a plurality of pixel units 11 and corresponding pixel circuits (not shown in fig. 2), the type of the pixel units 11 is not limited, and the display panel may be a non-active Light-Emitting pixel unit, such as a liquid crystal pixel unit formed by using a liquid crystal and a color filter, or an active Light-Emitting pixel unit, such as a pixel unit formed by an Organic Light-Emitting Diode (OLED), and the pixel circuits may include a plurality of transistors and at least one capacitor, and may be selected according to practical situations. The frame area 20 has no display function, and is used for setting related circuits, such as shift register circuits arranged at the left and right frames, wherein the shift register circuits comprise a plurality of cascaded shift registers for providing scanning signals for corresponding pixel circuits. The bezel area 20 further includes a first binding area 30 and a second binding area 40, the first binding area 30 being located between the display area 10 and the second binding area 40. The first bonding region 30 includes a plurality of first bonding pads 31 (only 4 first bonding pads 31 are schematically shown in fig. 2), and the first bonding pads 31 of the first bonding region 30 are used to bond with a driver chip to achieve an electrical connection, and each interface of the driver chip is bonded with a corresponding first bonding pad 31. The second bonding region 40 includes a plurality of second bonding pads 41 (only 4 second bonding pads 41 are schematically shown in fig. 2), and the second bonding pads 41 of the second bonding region 40 are used to bond together with the FPC to make electrical connection. The display region 10 includes a plurality of signal lines 12, and the signal lines 12 may be data signal lines connected to the pixel units 11, with first ends of the signal lines 12 extending to the first bonding regions 30. In other embodiments, the signal line 12 may also be a touch signal line or a signal line for transmitting signals in other display panels. The frame area 20 includes a plurality of first wires 50, a first end of the first wires 50 is electrically connected to the first bonding pads 31, a second end of the first wires 50 is electrically connected to the second bonding pads 41, and the first wires 50 implement signal transmission between the first bonding pads 31 and the second bonding pads 41. The frame area 20 further includes a plurality of second wires 60 and a plurality of dummy pads 70, wherein a first end of the second wires 60 extends to the first bonding area 30 but is not connected to the first bonding pads 31 in the first bonding area 30, a second end of the second wires 60 is electrically connected to the dummy pads 70, the second wires 60 are disposed between two adjacent first wires 50, short circuits between two adjacent first wires 50 can be avoided, the dummy pads 70 are disposed in the second bonding area 40, and the dummy pads 70 are located between two adjacent second bonding pads 41, which is beneficial to avoiding short circuits between two adjacent second bonding pads 41. In addition, when the display panel is tested in the process of manufacturing the display panel, if the first wire 50 or the second bonding pad 41 has a short circuit fault (at this time, the first wire 50 and the adjacent second wire are short-circuited 60 or the second bonding pad 41 and the adjacent dummy pad 70 are short-circuited), the electrical signals on the second wire 60 and the dummy pad 70 will change, and the display panel with fault can be screened out by detecting the signal. During an operation stage of the display panel, the second wires 60 may separate signals of two adjacent first wires 50, and the dummy pads 70 may separate signals of two adjacent second bonding pads 41, reducing interference between the signals.
According to the technical scheme, the second wiring is arranged between the two adjacent first wirings, and the dummy bonding pad is arranged between the two adjacent second bonding pads, so that the short circuit of the adjacent first wirings or the two adjacent second bonding pads due to the processing problem can be avoided; the second wiring is electrically connected with the corresponding dummy bonding pad, so that a shielding effect can be achieved on signals between the two adjacent first wirings and the two adjacent second bonding pads, normal operation of the display panel is prevented from being influenced due to abnormal signal transmission, and the performance of the display panel is improved.
In the embodiment of the present invention, the number of the second wirings and the dummy pads is not particularly limited, and various arrangements may be provided during the implementation. Fig. 3 is a schematic partial structure of a display panel according to an embodiment of the invention. Referring to fig. 3, optionally, one second trace 60 is disposed between any two adjacent first traces 50, and one dummy pad 70 is disposed between any two second bonding pads 41. By arranging the second wires 60 between all the first wires 50 and arranging the dummy pads 70 between all the second bonding pads 41, the short circuit condition of all the first wires or the second dummy pads can be checked during the manufacturing process of the display panel, and the coupling effect between adjacent signals can be shielded to the greatest extent during the operation process of the display panel.
In another embodiment, optionally, the distribution density of the dummy pads gradually increases along a direction in which the center of the second bonding region points to both sides.
It can be understood that in the process of the display panel, the edge area of the binding area is prone to poor short circuit, and the distribution density of the dummy pads on two sides of the second binding area is greater than that of the central area, so that the technical effect of approaching can be achieved on the basis of less dummy pads and second wires. Fig. 4 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention, and fig. 5 is a schematic diagram of a partial structure of another display panel according to an embodiment of the present invention. Referring to fig. 4 and 5, the second bonding region 40 includes a first region 401, a second region 402, and a third region 403 arranged from the center to both sides, the first region 401, the second region 402, and the third region 403 have the same number of second bonding pads 41, one dummy pad 70 is disposed in the first region 401, three dummy pads 70 are disposed in the second region 402, five dummy pads 70 are disposed in the third region 403, that is, the distribution density of the dummy pads 70 disposed at both sides of the second bonding region 40 is greater than that of the dummy pads 70 in the center region, so that a technical effect similar to the above embodiment can be achieved on the basis of fewer dummy pads and second wirings.
It should be noted that, in fig. 4 and fig. 5, the division of the second binding area 40 into three areas from the center to one side is merely illustrative, and in other embodiments, the division of the areas of the second binding area 40 is not limited, and the specific number and positions of the dummy pads may be designed according to practical situations, which is not limited in the embodiments of the present invention.
Fig. 6 is a schematic partial structure of another display panel according to an embodiment of the invention. Referring to fig. 6, optionally, the bezel area 20 further includes a first sensing pad 32 and a sensing trace 80, the first sensing pad 32 is electrically connected to the at least one dummy pad 70 through the sensing trace 80, and the first sensing pad 32 is used to output a signal on the corresponding dummy pad 70 when the display panel is sensed.
By providing the first inspection pad 32, the first inspection pad 32 may be used as an output terminal of a signal during inspection of the display panel, and the output signal on the dummy pad 70 may be inspected, for example, when the dummy pad 70 is shorted with the second bonding pad 41, the signal of the first inspection pad 32 may be detected to be the same as or close to the signal on the second bonding pad 41, so that a defective display panel may be intercepted during the inspection stage, and the preparation of a defective display panel may be avoided. When the dummy pad 70 does not send a short circuit with the second bonding pad 41, it can be detected that the signal of the first detection pad 32 is independent of the second bonding pad 41, for example, the ground signal GND on the dummy pad 70. In the embodiment of the present invention, the specific position of the first detection pad is not limited, and in the implementation, referring to fig. 6, optionally, the first detection pad 32 is located in the first binding area 30, and the first detection pad 32 may be connected to a detection port inside the driving chip to detect whether a short circuit abnormality occurs. In other embodiments, the first detection pad 32 may also be an external test device detection port, and fig. 7 is an exemplary schematic structural diagram of still another display panel according to an embodiment of the present invention, where the first detection pad 32 is an external test circuit detection port, and is disposed in an area outside the first bonding area 30 and the second bonding area 40, and specifically, the position of the first detection pad 32 may be set according to practical requirements.
Fig. 8 is a schematic partial structure of another display panel according to an embodiment of the invention. Referring to fig. 8, optionally, the bezel area 20 further includes a second sensing pad 42, the second sensing pad 42 being located at the second bonding area 40; the sensing trace 80 includes a first sensing trace 81 and a second sensing trace 82, the second sensing pad 42 is electrically connected to the at least one dummy pad 70 through the first sensing trace 81, and the first sensing pad 32 and the second sensing pad 42 are electrically connected through the second sensing trace 82.
In this embodiment, the first detection pad 32 is located in the first binding area 30, and the second detection pad 42 is located in the second binding area 40, so that the pad can be prevented from being arranged outside the binding area, and the design difficulty is simplified. Alternatively, the dummy pad 70 and the second sensing pad 42 are electrically connected through the first sensing trace 81 provided at the frame region 20. By directly disposing the first detecting trace 81 in the frame region 20 of the display panel, the first detecting trace can be designed simultaneously with other traces and formed by the same process.
In another embodiment, a plurality of second bonding pads having similar functions may be provided as a group, and dummy pads within the group may be connected to the same inspection pad to reduce the number of inspection ports. Optionally, the second bonding region includes at least one group of bonding pads, the group of bonding pads including at least three second bonding pads for transmitting signals of the same type and at least two dummy pads, the dummy pads being electrically connected to the same first inspection pad. Fig. 9 is a schematic diagram illustrating a partial structure of a display panel according to another embodiment of the present invention. In fig. 9, a set of bonding pads 404 of the second bonding region 40 is shown, the set of bonding pads 404 including three second bonding pads 42 transmitting the same type of signal and two dummy pads 70, the two dummy pads 70 being electrically connected to the same first sensing pad 32. The two dummy pads 70 shown in fig. 9 are only schematically electrically connected to the first inspection pad 32 directly by a connection line, and in other embodiments, at least two dummy pads may be connected to one second inspection pad and then connected to the first inspection pad, which may be selected according to practical situations.
Alternatively, in the present embodiment, the first trace 50, the second trace 60, and the detection trace 80 are formed using the same material and the same process; the second sensing pad 42, the dummy pad 70, and the first sensing pad 32 are formed using the same process using the same material. This allows the first trace 50, the second trace 60, and the test trace 80 to be designed together and formed simultaneously, and the second test pad 42, the dummy pad 70, and the first test pad 32 to be designed together and formed simultaneously, which is advantageous in simplifying the process difficulty.
The embodiment of the invention also provides a display device, which comprises any one of the display panels provided by the embodiment. The display device can be a mobile phone, a computer, intelligent wearable equipment and the like.
Because the display device provided by the embodiment of the present invention includes any one of the display panels provided by the above embodiment, the display device has the same or corresponding technical effects as the display panel, and will not be described herein.
Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 10, the display device may further include a driving chip 90 and a flexible circuit board 100, wherein the driving chip 90 is bound to the first binding region 30 of the display panel, one end of the flexible circuit board 100 is bound to the second binding region 40 of the display panel, and the other end of the flexible circuit board 100 may be bent toward a side facing away from the light emitting side of the display panel.
Optionally, the frame area of the display panel further includes a first detection pad and a detection trace, the first detection pad is electrically connected with the at least one dummy pad through the detection trace, and the first detection pad is used for outputting a signal on the corresponding dummy pad when detecting the display panel.
By arranging the first detection pad, the first detection pad can be used as an output end of a signal during detection of the display panel, and the output signal on the dummy pad is detected, for example, when the dummy pad is in short circuit with the second bonding pad, the signal of the first detection pad can be detected to be the same as or close to the signal on the second bonding pad, so that the defective display panel can be intercepted in the detection stage, and the preparation of the defective display panel is avoided. When the dummy pad is not shorted to the second bonding pad, it may be detected that the signal of the first detection pad is independent of the second bonding pad, for example, the ground signal GND on the dummy pad.
Fig. 11 is a schematic structural diagram of another display device according to an embodiment of the invention. Referring to fig. 11, optionally, the bezel area 20 of the display panel further includes a second detection pad 42; the sensing trace 80 includes a first sensing trace 81 and a second sensing trace 82, the second sensing pad 42 is electrically connected to the at least one dummy pad 70 through the first sensing trace 81 provided to the flexible circuit board 100, and the first sensing pad 32 and the second sensing pad 42 are electrically connected through the second sensing trace 82 provided to the frame region 20. In this embodiment, the first detecting trace 81 is disposed inside the flexible circuit board 100, so that the problem that the first detecting trace 81 needs to avoid the crossing of traces on the display panel can be avoided, which is beneficial to simplifying the design difficulty.
The embodiment of the invention also provides a detection method of the display device, which is suitable for the display device provided by the embodiment, wherein the frame area of the display panel comprises a first detection pad, a second detection pad and a detection wire, and the detection method comprises the following steps:
and loading a test signal to the second bonding pad, and detecting whether the second bonding pad is short-circuited according to the output signal of the first detection pad.
Optionally, detecting whether the second bonding pad is shorted based on the output signal of the first detection pad includes:
if the output voltage of the first detection pad is the same as the voltage of the test signal, the bonding pad is shorted with the adjacent dummy pad.
In the test stage in the preparation process of the display panel, a test signal is loaded to the second bonding pad, and if a short circuit occurs between the dummy pad and the second bonding pad or between the first wiring and the second wiring, the potential of the dummy pad changes, and at this time, the potential can be determined according to the output signal of the first detection pad. For example, the dummy pad is not connected with a signal, and should be at 0 potential or near 0 potential of ground initially, when a short circuit occurs, the output signal of the first detection pad is the same as or slightly lower than the voltage of the test signal (there may be a certain voltage drop due to the resistance effect).
When the display panel passes the test, and no short circuit abnormality exists, the first wiring can be separated by the second wiring when the display panel works normally, and the second binding pad is separated by the dummy pad, so that the signal shielding effect is realized. Optionally, the first detection pad is located in the first binding area, the first detection pad is connected with the driving chip, and the detection method further includes:
if the output voltage of the first detection bonding pad is different from the voltage of the test signal, the driving chip loads a reference voltage signal to the first detection bonding pad. Wherein the reference voltage signal may be a ground signal.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (16)

1. A display panel, comprising:
a display area and a border area surrounding the display area;
the frame area comprises a first binding area and a second binding area, and the first binding area is positioned between the display area and the second binding area;
the display area comprises a plurality of signal lines, and first ends of the signal lines extend to the first binding area;
the frame area comprises a plurality of first wires, the first binding area comprises a plurality of first binding pads, the second binding area comprises a plurality of second binding pads, the first ends of the first wires are electrically connected with the first binding pads, and the second ends of the first wires are electrically connected with the second binding pads;
the frame area further comprises a plurality of second wires and a plurality of dummy pads, wherein the first ends of the second wires extend to the first binding area, the second ends of the second wires are electrically connected with the dummy pads, the second wires are positioned between two adjacent first wires, the dummy pads are positioned in the second binding area, and the dummy pads are positioned between two adjacent second binding pads;
the distribution density of the dummy pads is gradually increased along the direction that the center of the second binding region points to the two sides.
2. The display panel of claim 1, wherein one of the second traces is disposed between any two adjacent first traces, and one of the dummy pads is disposed between any two of the second bonding pads.
3. The display panel of claim 1, wherein the bezel area further includes a first inspection pad and an inspection trace, the first inspection pad being electrically connected to at least one of the dummy pads through the inspection trace, the first inspection pad being for outputting a signal on the corresponding dummy pad when inspecting the display panel.
4. The display panel of claim 3, wherein the bezel area further comprises a second sense pad, the second sense pad being located at the second bonding area;
the detection wires comprise a first detection wire and a second detection wire, the second detection pad is electrically connected with at least one dummy pad through the first detection wire, and the first detection pad is electrically connected with the second detection pad through the second detection wire.
5. A display panel according to claim 3, wherein the first detection pad is located in the first bonding region.
6. A display panel according to claim 3, wherein the second bonding region comprises at least one group of bonding pads, the group of bonding pads comprising at least three second bonding pads transmitting like signals and at least two dummy pads, the dummy pads being electrically connected to the same first sensing pad.
7. The display panel of claim 4, wherein the dummy pad and the second sensing pad are electrically connected through a first sensing trace disposed at the bezel area.
8. The display panel of claim 4, wherein the first trace, the second trace, and the detection trace are formed using a same process using a same material;
the second inspection pad, the dummy pad, and the first inspection pad are formed using the same process using the same material.
9. A display device comprising the display panel according to any one of claims 1 to 8.
10. The display device of claim 9, further comprising a driver chip and a flexible circuit board, wherein the driver chip is bonded to a first bonding region of the display panel and one end of the flexible circuit board is bonded to a second bonding region of the display panel.
11. The display device of claim 10, wherein the bezel area of the display panel further includes a first inspection pad and an inspection trace, the first inspection pad being electrically connected to at least one of the dummy pads through the inspection trace, the first inspection pad being for outputting a signal on the corresponding dummy pad when inspecting the display panel.
12. The display device of claim 11, wherein the bezel area of the display panel further comprises a second detection pad;
the detection wires comprise a first detection wire and a second detection wire, the second detection pad is electrically connected with at least one dummy pad through the first detection wire arranged on the flexible circuit board, and the first detection pad and the second detection pad are electrically connected through the second detection wire arranged in the frame area.
13. A method for inspecting a display device, which is applicable to the display device of any one of claims 10 to 12, wherein a frame area of a display panel includes a first inspection pad, a second inspection pad, and an inspection trace, the method comprising:
and loading a test signal to the second binding pad, and detecting whether the second binding pad is short-circuited or not according to the output signal of the first detection pad.
14. The inspection method of claim 13, wherein inspecting whether the second bonding pad is shorted based on the output signal of the first inspection pad comprises:
and if the output voltage of the first detection bonding pad is the same as the voltage of the test signal, the binding bonding pad is short-circuited with the adjacent dummy bonding pad.
15. The method of claim 13, wherein the first inspection pad is located in a first bonding area, the first inspection pad being connected to the driver chip, the method further comprising:
and if the output voltage of the first detection bonding pad is different from the voltage of the test signal, loading a reference voltage signal to the first detection bonding pad by the driving chip.
16. The method of claim 15, wherein the reference voltage signal is a ground signal.
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