CN111524450B - Display device, binding impedance detection method thereof and screen crack detection method - Google Patents

Display device, binding impedance detection method thereof and screen crack detection method Download PDF

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Publication number
CN111524450B
CN111524450B CN202010353835.0A CN202010353835A CN111524450B CN 111524450 B CN111524450 B CN 111524450B CN 202010353835 A CN202010353835 A CN 202010353835A CN 111524450 B CN111524450 B CN 111524450B
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pin
test
signal
wire
signal pin
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CN111524450A (en
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高瀚斐
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • 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

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides a display device, a binding impedance detection method and a screen body crack detection method thereof. The chip on film is connected with a display area of the display panel and the flexible circuit board, a binding impedance detection circuit and a screen body crack detection circuit are arranged in the display device, the flexible circuit board comprises a plurality of test pins, and the plurality of test pins are connected in the binding impedance detection circuit and the screen body crack detection circuit. At least one of the plurality of test pins is simultaneously connected in the bound impedance detection circuit and the screen crack detection circuit. The invention can effectively reduce the number of test pins, is beneficial to manufacturing the display panel with a narrow frame, reduces the possibility of ESD (electro-static discharge) of the display panel in the process of bonding impedance and detecting screen body cracks, and improves the display effect of the display panel.

Description

Display device, binding impedance detection method thereof and screen crack detection method
Technical Field
The invention relates to the technical field of display, in particular to a display device, a binding impedance detection method thereof and a screen body crack detection method.
Background
With the popularization of electronic devices, various electronic devices equipped with display screens are becoming common, such as mobile phone screens, displays, electronic billboards, and the like. In order to obtain better visual experience, the requirements of people on the performance, quality and display effect of display screens are higher and higher.
Currently, a Display Panel includes a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an Organic Light-Emitting Diode (OLED) Panel, and the like, and in order to ensure input of a driving signal and a driving power in the Display Panel, a driving Circuit (IC) and a Flexible Printed Circuit (FPC) are generally bonded on the Display Panel. The connection between the display panel and the IC and FPC is achieved by Chip On Film (COF) Bonding. Two ends of the COF are respectively bonded on the FPC and the Panel, the IC is fixed on the COF, and the conduction is realized through an Anisotropic Conductive Film (ACF) in the middle.
However, the number of PINs (PINs) arranged in the current COF is too large, which results in too large frame width of the display panel and is not favorable for narrow frame design. In addition, when performing a bond resistance and a screen Crack detection (PCD), an electrostatic discharge (ESD) that often occurs reduces the display effect of the display Panel.
Disclosure of Invention
In order to solve at least one problem mentioned in the background art, the invention provides a display device, a binding impedance detection method thereof and a screen body crack detection method thereof, which can effectively reduce the number of test pins, are beneficial to manufacturing a display panel with a narrow frame, reduce the possibility of ESD (electro-static discharge) of the display panel in the process of binding impedance and detecting screen body cracks, and improve the display effect of the display panel.
In order to achieve the above object, in a first aspect, the present invention provides a display device, including a display panel, a flexible circuit board, and a chip on film, where the display panel includes a display area and a non-display area located at an outer periphery of the display area, and both the flexible circuit board and the chip on film are located in the non-display area.
The chip on film is connected with a display area of the display panel and the flexible circuit board, a binding impedance detection circuit and a screen body crack detection circuit are arranged in the display device, the flexible circuit board comprises a plurality of test pins, and the plurality of test pins are connected in the binding impedance detection circuit and the screen body crack detection circuit.
At least one of the plurality of test pins is simultaneously connected in the bound impedance detection circuit and the screen crack detection circuit.
In a second aspect, the present invention further provides a method for detecting a binding impedance of a display device, which is used to test the binding impedance of the display device, and the method for detecting the binding impedance of the display device includes:
acquiring a first test signal of a first test pin, a second test signal of a second test pin, a third test signal of a third test pin and a fourth test signal of a fourth test pin in a flexible circuit board;
and determining the binding impedance of the display device according to the first test signal, the second test signal, the third test signal and the fourth test signal.
In a third aspect, the present invention further provides a method for detecting a screen crack of a display panel of a display device, where the method for detecting a screen crack of a display panel of a display device includes:
acquiring a first test signal of a first test pin and a fifth test signal of a fifth test pin in a flexible circuit board;
and determining the screen body crack of the display panel according to the first test signal and the fifth test signal.
According to the display device, the binding impedance detection method and the screen crack detection method provided by the invention, the plurality of test pins are arranged in the flexible circuit board, and the binding impedance among the display panel, the flexible circuit board and the chip on film can be determined by utilizing the test signals among the plurality of test pins, and whether cracks exist in the screen of the display panel can be determined, so that the difficulty of detecting the binding impedance and the screen cracks is reduced. At least one of the plurality of test pins is simultaneously connected to the binding impedance detection circuit and the screen body crack detection circuit, so that at least one test pin is shared by the two circuits, the number of the test pins in the display device is reduced, the area of a non-display area of the display panel occupied by the test pins is reduced, and the display panel with a narrow frame is favorably manufactured. And the reduction of the number of the test pins is beneficial to reducing the area of a test area exposed outside in the process of detecting the bound impedance and the screen body cracks, reduces the possibility of ESD, and optimizes the display effect of the display panel and the display device.
The construction of the present invention and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a display device according to the prior art;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display device according to a second embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for detecting a bound impedance of a display device according to a third embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for detecting a screen crack of a display device according to a fourth embodiment of the present invention.
Description of reference numerals:
100-a display device; 10-a display panel;
11-a display area; 12-a non-display area;
13-screen body wires; 20-a flexible circuit board;
p1 — first test pin; p2-second test pin;
p3-third test pin; p4-fourth test pin;
p5-fifth test pin; p6-sixth test pin;
p7-seventh test pin; p8-eighth test pin;
l1 — first conductor; l2 — second conductor;
l3 — third conductor; l4 — fourth conductor;
l5-fifth conductor; l6-sixth conductor;
l7-seventh conductor; l8 — eighth conductor;
30-chip on film; g1 — first signal pin;
g2 — second signal pin; g3-third signal pin;
g4-fourth signal pin; g5-fifth signal pin;
g6-sixth signal pin; g7-seventh signal pin;
g8-eighth signal pin; g9-ninth signal pin;
g10-tenth signal pin; 40-a drive circuit board;
41-a first drive conductor; 42-a second drive conductor;
1-a display panel; 2-a flexible circuit board;
3-a chip on film; 4-a drive circuit board;
5-screen body wires; g 1-first test pin;
g 2-second test pin; g 3-third test pin;
g 4-fourth test pin; g 5-fifth test pin;
g 6-sixth test pin; g 7-seventh test pin;
g 8-eighth test pin; g 9-ninth test pin;
g 10-tenth test pin.
Detailed Description
Fig. 1 is a schematic structural diagram of a display device in the prior art, and referring to fig. 1, the inventor of the present invention found in a practical research process that, in a current display device, a driving circuit board 4, a flexible circuit board 2 and a chip on film 3 are generally disposed in a non-display area of a display panel 1, the driving circuit board 4 is disposed on the chip on film 3, and a part of the display area of the display panel 1 is connected to the flexible circuit board 2 through the chip on film 3, so that a driving signal and a driving power source in the flexible circuit board 2 are conveniently transmitted to the display panel 1, and normal light emission of the display panel 1 is ensured. The flexible circuit board 2 is provided with a plurality of test pins, the plurality of test pins respectively comprise a first test pin g1 and a sixth test pin g6 which are arranged in a matched mode, and the first test pin g1 and the sixth test pin g6 are connected to two ends of a screen body lead 5 of the display panel 1 through pins and leads in the flip chip film 3 respectively, so that in the screen body crack detection process, whether cracks exist in the screen body can be determined by comparing resistance values between the first test pin g1 and the sixth test pin g 6. The plurality of test pins further include a second test pin g2, a third test pin g3, a fourth test pin g4, a fifth test pin g5, a seventh test pin g7, an eighth test pin g8, a ninth test pin g9 and a tenth test pin g10, the test pins are connected to the pins and the wires of the flip chip film 3, and the bonding impedances of the flip chip film 3 and the flexible circuit board 2 and the flip chip film 3 and the display panel 1 are respectively determined by comparing resistance values between different test pins in the test process of the bonding impedance.
Wherein, binding impedance and screen body crack testing in-process, used different test pin in a plurality of test pins respectively, lead to the test pin only to accomplish the test of binding impedance or the test of screen body crack, the function that the test pin realized is comparatively single to the quantity of test pin is more, thereby has increased the area of the shared non-display area of test pin, makes display panel's frame width great, is unfavorable for making the display panel of narrow frame. Furthermore, in the process of detecting the bound impedance and the screen body crack, the test pins need to be exposed outside, and the area of the test area exposed outside is large due to the excessive number of the test pins, so that the problem of ESD in the display device is easily caused, and the display effect of the display panel and the display device is reduced.
In view of this, in the embodiment of the present invention, the plurality of test pins are arranged in the flexible circuit board of the display device, and the test signals among the plurality of test pins can be used to determine that the bonding impedances are arranged among the display panel, the flexible circuit board and the chip on film, and also determine whether the screen body of the display panel has cracks, so that the difficulty of detecting the bonding impedances and the screen body cracks is reduced. At least one of the plurality of test pins is simultaneously connected to the binding impedance detection circuit and the screen body crack detection circuit, so that at least one test pin is shared by the two circuits, the number of the test pins in the display device is reduced, the area of a non-display area of the display panel occupied by the test pins is reduced, and the display panel with a narrow frame is favorably manufactured. And the reduction of the number of the test pins is beneficial to reducing the area of a test area exposed outside in the process of detecting the bound impedance and the screen body cracks, reduces the possibility of ESD, and optimizes the display effect of the display panel and the display device.
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example one
Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 2, a display device 100 according to an embodiment of the present invention includes a display panel 10, a flexible circuit board 20, and a chip on film 30, wherein the display panel 10 includes a display area 11 and a non-display area 12 located at an outer periphery of the display area 11, and the flexible circuit board 20 and the chip on film 30 are both located in the non-display area 12.
The chip on film 30 is connected to the display area 11 of the display panel 10 and the flexible circuit board 20, the display device 100 is provided with a bound impedance detection circuit and a screen crack detection circuit, the flexible circuit board 20 includes a plurality of test pins, and the plurality of test pins are connected to the bound impedance detection circuit and the screen crack detection circuit.
At least one of the plurality of test pins is simultaneously connected in the bound impedance detection circuit and the screen crack detection circuit.
It should be noted that the display panel 10 provided in this embodiment may be a liquid crystal display panel 10, or may also be an organic light emitting display panel 10, and the type of the display panel 10 is not limited in this embodiment. Taking the display panel 10 as an organic light emitting display panel 10 as an example for explanation, a plurality of organic light emitting diodes arranged in an array and a control circuit for controlling the light emitting process of the organic light emitting diodes are arranged in a display area 11 of the display panel 10, and a driving circuit board 40 and a flexible circuit board 20 are arranged in a non-display area 12 of the display panel 10, wherein the driving circuit board 40 is arranged on a chip on film 30, at least a part of the flexible circuit board 20 is connected with a part of the chip on film 30, and a part of the chip on film 30 is connected with the display area 11 of the display panel 10, so that the flexible circuit board 20 and the driving circuit board 40 can be conducted with the display area 11 through the chip on film 30, and a driving signal and a power signal are sent to the control circuit in the display area 11, so as to achieve the purpose of controlling the light emitting of the display panel 10.
Based on the fact that the flip chip 30 is bound and connected with the flexible circuit board 20 and the display panel 10, if the binding is not good, the binding impedance between the flip chip 30 and the flexible circuit board 20 and between the flip chip 30 and the display panel 10 is too large, which affects the signal transmission of the control circuit in the display area 11, thereby causing the light emitting process and the display picture in the display area 11 to be abnormal. Further, the display panel 10 is often cracked due to impact or the like during use. The display effect of the display panel 10 and the display device 100 is affected by the too large binding resistance and the cracks of the screen body.
In view of this, the display device 100 of the present embodiment is provided with a bound impedance detection circuit and a screen crack detection circuit, which are respectively used for testing the bound impedance and the screen crack of the display area 11. The testing process requires that the bound impedance and the screen crack condition be determined by comparing test signals between multiple test pins on the flexible circuit board 20.
In this embodiment, at least one test pin is simultaneously connected to the bound impedance detection circuit and the screen crack detection circuit, that is, the bound impedance detection circuit and the screen crack detection circuit may share at least one test pin. Therefore, the test pins connected with the test pins can finish the test process of binding impedance and can realize the purpose of detecting the cracks of the screen body, so that the functions of the shared test pins are enriched, and compared with the number of the test pins in the prior art, the embodiment can achieve the purpose of reducing the number of the test pins by means of enriching the functions of the test pins. Therefore, the area of the non-display area 12 of the display panel 10 occupied by the test pins can be reduced, and the display panel 10 with a narrow frame can be manufactured. Further, during the detection process of the bound impedance and the screen body crack, the number of the exposed test pins is reduced, and the area of the test area is reduced, so that the possibility of ESD occurrence can be reduced, and the display effect of the display panel 10 and the display device 100 is optimized.
Specifically, the chip on film 30 is provided with a plurality of signal pins, which include a first signal pin G1, a second signal pin G2, a third signal pin G3 and a fourth signal pin G4 disposed at the connection between the chip on film 30 and the flexible circuit board 20, and a fifth signal pin G5, a sixth signal pin G6 and a seventh signal pin G7 disposed at the connection between the chip on film 30 and the display panel 10.
In the chip on film 30, the first signal pin G1 and the fifth signal pin G5 are connected by a first wire L1, the second signal pin G2 and the sixth signal pin G6 are connected by a second wire L2, the fourth signal pin G4 and the seventh signal pin G7 are connected by a fourth wire L4, the third signal pin G3 is connected to the fifth signal pin G5 by a third wire L3, and the fifth signal pin G5 and the sixth signal pin G6 are connected by a fifth wire L5.
Specifically, the display panel 10 is provided with a screen lead 13, and two ends of the screen lead 13 are respectively connected to a fifth signal pin G5 and a seventh signal pin G7 at a connection position of the flip-chip film 30 and the display panel 10.
Wherein the screen wires 13 are in the non-display area 12 of the display panel 10. It should be noted that, the screen body conducting wire 13 may be disposed on a side close to the frame in the non-display area 12 as shown in fig. 2, based on that the screen body has a higher possibility of being damaged near the frame during the impact process, so that the screen body conducting wire 13 is located on the side close to the frame to facilitate effective determination of the damaged area, when the screen body has a crack, the resistance value on the screen body conducting wire 13 is increased accordingly, and therefore if the detected resistance value of the screen body conducting wire 13 is increased and exceeds a preset range, it may be determined that the screen body has a crack.
Among them, the plurality of test pins in the flexible circuit board 20 include a first test pin P1 connected with the first signal pin G1, a second test pin P2 connected with the second signal pin G2, a third test pin P3 and a fourth test pin P4 connected with the third signal pin G3, and a fifth test pin P5 connected with the fourth signal pin G4.
The screen body crack detection circuit comprises a first test pin P1, a first signal pin G1, a first lead wire L1, a fifth signal pin G5, a screen body lead wire 13, a seventh signal pin G7, a fourth lead wire L4, a fourth signal pin G4 and a fifth test pin P5 which are connected in sequence.
The bound impedance detection circuit includes a first bound impedance detection circuit for testing the flexible circuit board 20 and the chip on film 30, and a second bound impedance detection circuit for testing the connection impedance of the display panel 10 and the chip on film 30.
When the third signal pin G3 is connected to the fifth signal pin G5 through the third wire L3, the first bound impedance detection circuit includes a first test pin P1, a first signal pin G1, a first wire L1, a third wire L3, a third signal pin G3, and a third test pin P3, which are connected in sequence; the second bound impedance detection circuit comprises a second test pin P2, a second signal pin G2, a second lead L2, a sixth signal pin G6, a fifth lead L5, a fifth signal pin G5, a third lead L3, a third signal pin G3 and a fourth test pin P4 which are connected in sequence.
It is specifically noted that the first test pin P1 is connected in both the first bound impedance detection circuit and the screen crack detection circuit. In this embodiment, the first test pin P1 completes the detection of the first bonding impedance and the screen crack between the flexible circuit board 20 and the chip on film 30 at the same time.
Further, the plurality of test pins of the flexible circuit board 20 further includes a sixth test pin P6, a seventh test pin P7, and an eighth test pin P8.
The plurality of signal pins include an eighth signal pin G8 and a ninth signal pin G9 disposed at a connection of the chip on film 30 and the flexible circuit board 20, and a tenth signal pin G10 disposed at a connection of the chip on film 30 and the display panel 10.
The sixth test pin P6 is connected to the eighth signal pin G8, the seventh test pin P7 and the eighth test pin P8 are both connected to the ninth signal pin G9, the eighth signal pin G8 is connected to the tenth signal pin G10 through a sixth wire L6 inside the chip on film 30, the ninth signal pin G9 is connected to the seventh signal pin G7 through a seventh wire L7 inside the chip on film 30, and the tenth signal pin G10 is connected to the seventh signal pin G7 through an eighth wire L8 inside the chip on film 30.
It should be noted that in this embodiment, the detection of the screen body crack can be completed through the first test pin P1 and the fifth test pin P5 in the flexible circuit board 20, and the first test pin P1, the second test pin P2, the third test pin P3, and the fourth test pin P4 implement the test of the bound impedance. However, the connection between the conventional flip-chip 30 and the display panel 10 and the flexible circuit board 20 is conducted through the ACF, and the connection stability at different connection positions is different, and the binding impedance result is lower in accuracy only through single position binding impedance detection. Therefore, in order to improve the testing accuracy of the bound impedance at the connection, the present embodiment is further provided with a sixth test pin P6, a seventh test pin P7 and an eighth test pin P8. The testing of the bound impedance is also accomplished through the fifth test pin P5, the sixth test pin P6, the seventh test pin P7, and the eighth test pin P8. In practical use, a user can compare the binding impedance results tested by the first test pin P1, the second test pin P2, the third test pin P3 and the fourth test pin P4 with the binding impedance results tested by the fifth test pin, the sixth test pin P6, the seventh test pin P7 and the eighth test pin P8, so as to determine an average binding impedance value according to the two binding impedance results, thereby avoiding the problem of low accuracy caused by single test position of the binding impedance.
Further, the display device 100 further includes a driving circuit board 40, the driving circuit board 40 is disposed on the chip on film 30, and the driving circuit board 40 is connected to the display panel 10 through a driving circuit; the driving circuit board 40 is provided with a first driving wire 41 and a second driving wire 42 connected to the driving circuit board 40.
When the third signal pin G3 is connected to the fifth signal pin G5 through the third wire L3, and the ninth signal pin G9 is connected to the seventh signal pin G7 through the seventh wire L7, one end of the first driving wire 41 is connected to the driving circuit board 40, the other end of the first driving wire 41 is connected to the second wire L2, one end of the second driving wire 42 is connected to the driving circuit board 40, and the other end of the second driving wire 42 is connected to the sixth wire L6.
The driving circuit comprises a driving circuit board 40, a first driving wire 41, a second wire L2, a sixth signal pin G6, a fifth wire L5, a fifth signal pin G5, a screen body wire 13, a seventh signal pin G7, an eighth wire L8, a tenth signal pin G10, a sixth wire L6 and a second driving wire 42 which are connected in sequence.
It should be noted that the driving circuit board 40 mainly inputs driving signals to the control circuit in the display area 11 of the display panel 10. In this embodiment, based on the fact that the screen body wire 13 is located in the driving circuit, it is also possible to determine whether the resistance value on the screen body wire 13 meets a preset range by obtaining the resistance value in the driving circuit, so as to determine whether the screen body has a crack.
Example two
Fig. 3 is a schematic structural diagram of a display device according to a second embodiment of the present invention, and referring to fig. 3, on the basis of the first embodiment, the second embodiment of the present invention provides a display device 100 with another structure, and compared with the first embodiment, the difference between the first embodiment and the second embodiment is that: the connection of the pins inside the chip on film 30 in the display device 100 is different.
Specifically, inside the chip on film 30, the third signal pin G3 is connected to the sixth signal pin G6 through a third wire L3. The ninth signal pin G9 is connected to the tenth signal pin G10 through a seventh wire L7 inside the flip chip 30.
When the third signal pin G3 is connected to the sixth signal pin G6 through the third wire L3, the first bound impedance detection circuit includes a second test pin P2, a second signal pin G2, a second wire L2, a sixth signal pin G6, a third wire L3, a third signal pin G3, and a third test pin P3, which are connected in sequence; the second bound impedance detection circuit comprises a first test pin P1, a first signal pin G1, a first lead L1, a fifth signal pin G5, a fifth lead L5, a sixth signal pin G6, a third lead L3, a third signal pin G3 and a fourth test pin P4 which are connected in sequence.
When the third signal pin G3 is connected to the sixth signal pin G6 through the third wire L3, and the ninth signal pin G9 is connected to the tenth signal pin G10 through the seventh wire L7, one end of the first driving wire 41 is connected to the driving circuit board 40, the other end of the first driving wire 41 is connected to the third wire L3, one end of the second driving wire 42 is connected to the driving circuit board 40, and the other end of the second driving wire 42 is connected to the seventh wire L7.
The driving circuit comprises a driving circuit board 40, a first driving wire 41, a third wire L3, a sixth signal pin G6, a fifth wire L5, a fifth signal pin G5, a screen body wire 13, a seventh signal pin G7, an eighth wire L8, a tenth signal pin G10, a seventh wire L7 and a second driving wire 42 which are connected in sequence.
It should be noted that, in this embodiment, the first test pin P1 is connected to the second bound impedance detection circuit and the screen crack detection circuit at the same time. The first test pin P1 completes the detection of the second bonding resistance and the screen crack between the display panel 10 and the flip chip 30 at the same time.
Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.
EXAMPLE III
Fig. 4 is a flowchart illustrating a method for detecting a binding impedance of a display device according to a third embodiment of the present invention. Referring to fig. 4, on the basis of the first embodiment or the second embodiment, a third embodiment of the present invention provides a method for detecting a binding impedance of a display device, where the method for detecting a binding impedance can be used to test the binding impedance of the display device of the first embodiment or the second embodiment.
Specifically, the method for detecting the binding impedance of the display device specifically comprises the following steps:
s10: the method comprises the steps of obtaining a first test signal of a first test pin, a second test signal of a second test pin, a third test signal of a third test pin and a fourth test signal of a fourth test pin in the flexible circuit board.
It should be noted that, the first test signal, the second test signal, the third test signal, and the fourth test signal in this embodiment may be a resistance value at the test pin, or may also be a voltage value or a current value, and the specific type of the test signal is not limited in this embodiment. The present embodiment will be described with reference to the resistance value as an example.
S11: and determining the binding impedance of the display device according to the first test signal, the second test signal, the third test signal and the fourth test signal.
Specifically, when the third signal pin is connected to the fifth signal pin through the third wire and the ninth signal pin is connected to the seventh signal pin through the seventh wire, the first binding impedance between the flexible circuit board and the chip on film is determined according to the first test signal and the third test signal, and the second binding impedance between the chip on film and the display panel is determined according to the first test signal, the second test signal, the third test signal and the fourth test signal.
It should be noted that, with reference to fig. 2 in the first embodiment, when the third signal pin is connected to the fifth signal pin through the third wire, and the ninth signal pin is connected to the seventh signal pin through the seventh wire, the connection mode of the display panel in the first embodiment of the present invention is obtained. Determining a first bound impedance between the flexible circuit board and the chip on film according to the first test signal and the third test signal, wherein the first bound impedance can be determined by the following formula (1):
Figure BDA0002472801180000111
wherein R isCOF·FPCIs a first binding impedance, R, between a chip on film COF and a flexible printed circuit FPCP1Is the resistance value, R, of the first test pinP2Is the resistance value of the second test pin.
Further, a second bonding impedance of the chip on film and the display panel is determined according to the first test signal, the second test signal, the third test signal and the fourth test signal, and the second bonding impedance can be determined by the following formula (2):
Figure BDA0002472801180000121
wherein R isCOF·PanelIs the second bonding resistance, R, between the COF and the PanelP1Is the resistance value, R, of the first test pinP2Is the resistance value, R, of the second test pinP3Is the resistance value, R, of the third test pinP4Is the resistance value of the fourth test pin.
Specifically, when the third signal pin is connected to the sixth signal pin through the third wire and the ninth signal pin is connected to the tenth signal pin through the seventh wire, the first binding impedance between the flexible circuit board and the chip on film is determined according to the second test signal and the third test signal, and the second binding impedance between the chip on film and the display panel is determined according to the first test signal, the second test signal, the third test signal and the fourth test signal.
It should be noted that, with reference to fig. 3 in the second embodiment, when the third signal pin is connected to the sixth signal pin through the third wire, and the ninth signal pin is connected to the tenth signal pin through the seventh wire, the connection mode of the display panel in the second embodiment of the present invention is obtained. Determining a first bound impedance between the flexible circuit board and the chip on film according to the second test signal and the third test signal, wherein the first bound impedance can be determined by the following formula (3):
Figure BDA0002472801180000122
wherein R isCOF·FPCIs a first binding impedance, R, between a chip on film COF and a flexible printed circuit FPCP2Is the resistance value, R, of the second test pinP3Is the resistance value of the third test pin.
Further, a second bonding impedance of the chip on film and the display panel is determined according to the first test signal, the second test signal, the third test signal and the fourth test signal, and the second bonding impedance can be determined by the following formula (4):
Figure BDA0002472801180000123
wherein R isCOF·PanelIs the second bonding resistance, R, between the COF and the PanelP1Is the resistance value, R, of the first test pinP2Is the resistance value, R, of the second test pinP3Is the resistance value, R, of the third test pinP4Is the resistance value of the fourth test pin.
Other technical features are the same as those of the first embodiment or the second embodiment, and the same technical effects can be achieved, which are not described in detail herein.
In the bound impedance detection method for the display device provided by the third embodiment of the present invention, the first test pin of the plurality of test pins is connected to the bound impedance detection circuit and the screen crack detection circuit, so that the two circuits share at least one test pin, the number of the test pins in the display device is reduced, the area of the non-display area of the display panel occupied by the test pins is reduced, and the display panel with a narrow frame can be manufactured. And the reduction of the number of the test pins is beneficial to reducing the area of a test area exposed outside in the process of detecting the bound impedance and the screen body cracks, reduces the possibility of ESD, and optimizes the display effect of the display panel and the display device.
Example four
Fig. 5 is a schematic flow chart of a method for detecting a screen crack of a display device according to a fourth embodiment of the present invention, and on the basis of the first to third embodiments, the fourth embodiment of the present invention provides a method for detecting a screen crack of a display device, where the method for detecting a screen crack of a display panel in a display device according to the first embodiment or the second embodiment can be used for testing a screen crack of a display panel in a display device according to the second embodiment.
Specifically, the screen body crack detection method of the display device comprises the following steps:
s20: acquiring a first test signal of a first test pin and a fifth test signal of a fifth test pin in a flexible circuit board;
s21: and determining the screen body crack of the display panel according to the first test signal and the fifth test signal. It should be noted that the first test signal and the fifth test signal may be resistance values at the first test pin and the fifth test pin, or may be voltage values or current values, and the specific type of the test signal is not limited in this embodiment. The present embodiment will be described with reference to the resistance value as an example.
Specifically, when a crack occurs in the screen body, the resistance value on the screen body routing line is increased, so that when R is the crack, the resistance value on the screen body routing line is increasedP1-RP5Is less than or equal to a predetermined resistance value, it is indicated that no crack exists in the panel, and when R is less than or equal to the predetermined resistance valueP1-RP5If the absolute value of (A) is greater than the preset resistance value, it indicates that there is a crack in the screen body. Wherein R isP1Is the resistance value, R, of the first test pinP5Is the resistance value of the fifth test pin. The preset resistance value can be set according to the user's needs, and this embodiment does not limit this.
Other technical features are the same as those of the first to the second embodiments, and the same technical effects can be achieved, and are not repeated herein.
In the method for detecting a crack of a screen body of a display device, provided by the fourth embodiment of the present invention, whether a crack exists in the screen body is determined by comparing a first test signal on a first test pin connected to a wire of the screen body with a second test signal on a fifth test pin. Meanwhile, the first test pin is connected to the bound impedance detection circuit and the screen body crack detection circuit, so that at least one test pin is shared by the two circuits, the number of the test pins in the display device is reduced, the area of a non-display area of the display panel occupied by the test pins is reduced, and the display panel with a narrow frame can be manufactured. And the reduction of the number of the test pins is beneficial to reducing the area of a test area exposed outside in the process of detecting the bound impedance and the screen body cracks, reduces the possibility of ESD, and optimizes the display effect of the display panel and the display device.
In the description of the embodiments of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements, unless expressly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (12)

1. A display device is characterized by comprising a display panel, a flexible circuit board and a chip on film, wherein the display panel comprises a display area and a non-display area positioned on the periphery of the display area, and the flexible circuit board and the chip on film are both positioned in the non-display area;
the chip on film is connected with a display area of the display panel and the flexible circuit board, a binding impedance detection circuit and a screen body crack detection circuit are arranged in the display device, the flexible circuit board comprises a plurality of test pins, and the plurality of test pins are connected in the binding impedance detection circuit and the screen body crack detection circuit;
at least one of the plurality of test pins is simultaneously connected in the bound impedance detection circuit and the screen crack detection circuit;
the chip on film is provided with signal pins, and the signal pins are arranged at the joint of the chip on film and the flexible circuit board and the joint of the chip on film and the display panel.
2. The display device according to claim 1, wherein the signal pins include a first signal pin, a second signal pin, a third signal pin, and a fourth signal pin disposed at a connection of the chip on film and the flexible circuit board, and a fifth signal pin, a sixth signal pin, and a seventh signal pin disposed at a connection of the chip on film and the display panel;
in the chip on film, the first signal pin and the fifth signal pin are connected through a first wire, the second signal pin and the sixth signal pin are connected through a second wire, the fourth signal pin and the seventh signal pin are connected through a fourth wire, the third signal pin is connected to the fifth signal pin or the sixth signal pin through a third wire, and the fifth signal pin and the sixth signal pin are connected through a fifth wire.
3. The display device according to claim 2, wherein a screen body wire is disposed in the display panel, a fifth signal pin and a seventh signal pin are disposed at a connection position of the flip-chip film and the display panel, and two ends of the screen body wire are respectively connected to the fifth signal pin and the seventh signal pin;
the screen body wires are in the non-display area of the display panel.
4. The display device according to claim 3, wherein the plurality of test pins in the flexible circuit board include a first test pin connected to the first signal pin, a second test pin connected to the second signal pin, a third test pin and a fourth test pin connected to the third signal pin, and a fifth test pin connected to a fourth signal pin.
5. The display device according to claim 4, wherein the screen crack detection circuit comprises the first test pin, the first signal pin, the first wire, the fifth signal pin, the screen wire, the seventh signal pin, the fourth wire, the fourth signal pin, and the fifth test pin, which are connected in sequence.
6. The display device according to claim 5, wherein the bound impedance detection circuit includes a first bound impedance detection circuit for testing the flexible circuit board and the chip on film, and a second bound impedance detection circuit for testing a connection impedance of the display panel and the chip on film;
when the third signal pin is connected to the fifth signal pin through the third wire, the first bound impedance detection circuit includes the first test pin, the first signal pin, the first wire, the third signal pin, and the third test pin, which are connected in sequence; the second bound impedance detection circuit comprises the second test pin, the second signal pin, the second wire, the sixth signal pin, the fifth wire, the fifth signal pin, the third wire, the third signal pin and the fourth test pin which are connected in sequence;
the first test pin is connected to the first bound impedance detection circuit and the screen crack detection circuit at the same time;
when the third signal pin is connected to the sixth signal pin through the third wire, the first bound impedance detection circuit includes the second test pin, the second signal pin, the second wire, the sixth signal pin, the third wire, the third signal pin, and the third test pin, which are connected in sequence; the second bound impedance detection circuit comprises the first test pin, the first signal pin, the first wire, the fifth signal pin, the fifth wire, the sixth signal pin, the third wire, the third signal pin and the fourth test pin which are connected in sequence;
the first test pin is connected to the second bound impedance detection circuit and the screen crack detection circuit at the same time.
7. The display device according to claim 6, wherein the plurality of test pins of the flexible circuit board further includes a sixth test pin, a seventh test pin, and an eighth test pin;
the signal pins comprise an eighth signal pin and a ninth signal pin which are arranged at the joint of the chip on film and the flexible circuit board, and a tenth signal pin which is arranged at the joint of the chip on film and the display panel;
the sixth test pin is connected with the eighth signal pin, the seventh test pin and the eighth test pin are both connected with the ninth signal pin, the eighth signal pin is connected to the tenth signal pin through a sixth wire inside the chip on film, the ninth signal pin is connected to the seventh signal pin or the tenth signal pin through a seventh wire inside the chip on film, and the tenth signal pin is connected to the seventh signal pin through an eighth wire inside the chip on film.
8. The display device according to claim 7, further comprising a driving circuit board disposed on the chip on film, wherein the driving circuit board is connected to the display panel through a driving circuit; the driving circuit board is provided with a first driving lead and a second driving lead which are connected with the driving circuit board;
when the third signal pin is connected to the fifth signal pin through the third wire and the ninth signal pin is connected to the seventh signal pin through the seventh wire, one end of the first driving wire is connected to the driving circuit board, the other end of the first driving wire is connected to the second wire, one end of the second driving wire is connected to the driving circuit board, and the other end of the second driving wire is connected to the sixth wire;
the driving circuit comprises the driving circuit board, the first driving lead, the second lead, the sixth signal pin, the fifth lead, the fifth signal pin, the screen body lead, the seventh signal pin, the eighth lead, the tenth signal pin, the sixth lead and the second driving lead which are connected in sequence;
when the third signal pin is connected to the sixth signal pin through the third wire, the ninth signal pin is connected to the tenth signal pin through the seventh wire, one end of the first driving wire is connected to the driving circuit board, the other end of the first driving wire is connected to the third wire, one end of the second driving wire is connected to the driving circuit board, and the other end of the second driving wire is connected to the seventh wire;
the driving circuit comprises the driving circuit board, the first driving wire, the third wire, the sixth signal pin, the fifth wire, the fifth signal pin, the screen body wire, the seventh signal pin, the eighth wire, the tenth signal pin, the seventh wire and the second driving wire which are connected in sequence.
9. A method for detecting a binding impedance of a display device, for testing the binding impedance of the display device according to any one of claims 1 to 8, the method comprising:
acquiring a first test signal of a first test pin, a second test signal of a second test pin, a third test signal of a third test pin and a fourth test signal of a fourth test pin in a flexible circuit board;
and determining the binding impedance of the display device according to the first test signal, the second test signal, the third test signal and the fourth test signal.
10. The method for detecting the binding impedance of the display device according to claim 9, wherein the determining the binding impedance of the display device according to the first test signal, the second test signal, the third test signal, and the fourth test signal specifically comprises:
determining a first binding impedance between the flexible circuit board and the chip on film according to the first test signal and the third test signal;
determining a second bonding impedance of the chip on film and the display panel according to the first test signal, the second test signal, the third test signal and the fourth test signal,
and the third signal pin in the display device is connected to the fifth signal pin through a third wire, and the ninth signal pin is connected to the seventh signal pin through a seventh wire.
11. The method for detecting the binding impedance of the display device according to claim 9, wherein the determining the binding impedance of the display device according to the first test signal, the second test signal, the third test signal, and the fourth test signal specifically comprises:
determining a first binding impedance between the flexible circuit board and the chip on film according to the second test signal and the third test signal;
determining a second binding impedance of the chip on film and the display panel according to the first test signal, the second test signal, the third test signal and the fourth test signal;
and when the third signal pin in the display device is connected to the sixth signal pin through a third wire, the ninth signal pin is connected to the tenth signal pin through a seventh wire.
12. A screen crack detection method of a display device, for detecting a screen crack of a display panel of the display device according to any one of claims 1 to 8, the screen crack detection method of the display device comprising:
acquiring a first test signal of a first test pin and a fifth test signal of a fifth test pin in a flexible circuit board;
and determining the screen body crack of the display panel according to the first test signal and the fifth test signal.
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