CN110806667B - Display panel, repair method of data line of display panel and liquid crystal display device - Google Patents
Display panel, repair method of data line of display panel and liquid crystal display device Download PDFInfo
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136259—Repairing; Defects
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136259—Repairing; Defects
- G02F1/136263—Line defects
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Abstract
The invention provides a display panel, a repair method of data lines of the display panel and a liquid crystal display device, wherein the display panel comprises a display area, n +2 grid lines, m data lines, repair lines, a first on-off circuit and a second on-off circuit, wherein the first on-off circuit is arranged at the lower side of the display area and is respectively connected with the n +2 grid lines, the m data lines and the repair lines; the second on-off circuit is arranged on the upper side of the display area and is respectively connected with the 1 st grid line, the m data lines and the repairing line. According to the invention, the first on-off circuit and the second on-off circuit are respectively arranged on the upper side and the lower side of the display area, and the x-th data line of the single-point broken line is conducted with the repair line according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line, so that the data line of the single-point broken line can be automatically repaired when the display panel performs image display, and the market competitiveness of the liquid crystal display device is increased.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel, a method for repairing broken data lines of the display panel and a liquid crystal display device.
Background
Since the lcd has many advantages of lightness, thinness, energy saving, no radiation, etc., it is widely used in electronic devices such as tv, pc, tablet pc, mobile phone, digital camera, etc. In order to ensure the quality of the liquid crystal display device, the repair line is arranged on the display panel, so that when the data line is detected to be broken by a single point on the display panel, the data line can be repaired.
Referring to fig. 1, fig. 1 is a circuit diagram of a display panel of a conventional liquid crystal display device. As shown in fig. 1, a repair line 2 is disposed at the periphery of a display area 1, and a repair method of a data line of a display panel includes: and detecting and determining the data line 4 with single-point wire breakage, wherein the data line 4 and the repair line 2 are correspondingly welded at the upper side and the lower side of the display area 1. Therefore, after the data signal sent by the source driving circuit 3 is received by the welding point on the lower side of the display area 1 by the data line 4, the data signal can be transmitted to the welding point on the upper side of the display area 1 by the repair line 2, and then the data signal can be transmitted to the pixel unit connected with the data line 4 by one corresponding welding point of the two welding points of the data line 4, so that the single-point broken line repair of the data line 4 is realized.
However, in the conventional method for repairing the data lines of the display panel of the liquid crystal display device, the data lines and the repair lines need to be welded on the upper side and the lower side of the display area manually, so that the automation degree is not high enough, and the market competitiveness of the liquid crystal display device is reduced.
Disclosure of Invention
In view of the above, the present invention is directed to a display panel, a method for repairing a data line of the display panel, and a liquid crystal display device, which can automatically repair a data line with a single-point broken line without manually welding the data line and the repair line on the upper and lower sides of a display area, thereby increasing market competitiveness of the liquid crystal display device.
The embodiment of the invention provides a display panel, which comprises a display area, n +2 grid lines, m data lines, a repair line, a first on-off circuit and a second on-off circuit, wherein the n +2 grid lines receive scanning signals provided by a grid driving circuit connected with the n +2 grid lines, the 1 st grid line in the n +2 grid lines is positioned at the upper side of the display area, the 2 nd to the n +1 th grid lines are positioned in the display area, and the n +2 th grid line is positioned at the lower side of the display area; the m data lines and the 2 nd to n +1 th gate lines intersect to form a plurality of pixel units in the display area; the repair line is arranged on the periphery of the display area; the first on-off circuit is arranged at the lower side of the display area and is respectively connected with the (n + 2) th gate line, the m data lines and the repair line, so that the x-th data line of the m data lines, which detects the occurrence of single-point broken lines, is conducted with the repair line at the lower side of the display area according to a high-level scanning signal on the (n + 2) th gate line and a high-level data signal on a corresponding data line of the m data lines; the second on-off circuit is arranged on the upper side of the display area and is respectively connected with the 1 st grid line, the m data lines and the repairing line so as to conduct the x-th data line and the repairing line on the upper side of the display area according to a high-level scanning signal on the 1 st grid line and a high-level data signal on a corresponding data line in the m data lines, wherein n, m and x are positive integers, and x is not more than m.
Furthermore, the first on-off circuit comprises m lower side sub-on-off circuits, and the a-th lower side sub-on-off circuit comprises a first switch element, a second switch circuit and a first capacitor; the first switching element comprises a first control terminal, a first pass terminal and a second pass terminal, the first control terminal of the first switching element is connected with the (n + 2) th gate line, and the first pass terminal of the first switching element is connected with the a-th data line of the m data lines; the second switch element comprises a second control end, a third path end and a fourth path end, the second control end of the second switch element is connected with the second path end of the first switch element, the third path end of the second switch element is connected with the a-th data line in the m data lines, and the fourth path end of the second switch element is connected with the repair line; the first end of the first capacitor is connected with the second path end of the first switch element, and the second end of the first capacitor is grounded, wherein a is a positive integer and is less than or equal to m.
Furthermore, the second on-off circuit comprises m-1 upper side sub on-off circuits, and the b-th upper side sub on-off circuit comprises a third switching element, a fourth switching circuit and a second capacitor; the third switching element includes a third control terminal, a fifth path terminal and a sixth path terminal, the third control terminal of the third switching element is connected to the 1 st gate line, and the fifth path terminal of the third switching element is connected to the b-th data line of the m data lines; the fourth switching element comprises a fourth control end, a seventh path end and an eighth path end, the fourth control end of the fourth switching element is connected with the sixth path end of the third switching element, the seventh path end of the fourth switching element is connected with the (b + 1) th data line in the m data lines, and the eighth path end of the fourth switching element is connected with the repair line; the first end of the second capacitor is connected with the sixth pass end of the third switching element, the second end of the second capacitor is grounded, b is a positive integer and is not more than m-1.
Further, the high-level data signal on the corresponding one of the m data lines received by the first on-off circuit and the high-level data signal on the corresponding one of the m data lines received by the second on-off circuit are both provided by the source driving circuit.
Further, the display panel comprises a current detection circuit, wherein the current detection circuit is connected with the m data lines and used for determining the x-th data line with a single-point broken line by detecting the current of the m data lines.
Further, the current detection circuit comprises a detection input terminal, a first amplifier, a second amplifier and a detection output terminal; the detection input end is grounded through a first resistor; the positive phase input end of the first amplifier is grounded through a second resistor and is also grounded through a third resistor, and the negative phase input end of the first amplifier is connected with the detection input end through a fourth resistor and is also connected with the output end of the first amplifier through a fifth resistor; the positive phase input end of the second amplifier is grounded through a sixth resistor, and the negative phase input end of the second amplifier is connected with the output end of the first amplifier through a seventh resistor and is also connected with the output end of the second amplifier through an eighth resistor; the detection output end is connected with the output end of the second amplifier.
Further, the high-level data signal on the corresponding one of the m data lines received by the first on-off circuit and the high-level data signal on the corresponding one of the m data lines received by the second on-off circuit are both provided by the current detection circuit.
The embodiment of the invention also provides a method for repairing the broken data line of the display panel, which comprises the following steps: the n +2 grid lines receive scanning signals provided by the grid driving circuits connected with the grid lines; when the 1 st gate line or the (n + 2) th gate line receives a scan signal of a high level, a corresponding one of the m data lines receives a data signal of a high level; the first on-off circuit conducts the x-th data line and the repair line on the lower side of the display area according to a high-level scanning signal on the (n + 2) -th gate line and a high-level data signal on a corresponding data line in the m data lines; and the second on-off circuit conducts the x-th data line and the repair line on the upper side of the display area according to a high-level scanning signal on the 1 st gate line and a high-level data signal on a corresponding data line in the m data lines.
Further, the display panel includes a current detection circuit, and the repairing method further includes the steps of: the display panel displays an image with uniform brightness in the display area; the n +2 grid lines sequentially receive high-level scanning signals; the current detection circuit detects the current of the m data lines to determine the x-th data line.
The embodiment of the invention also provides a liquid crystal display device which comprises the display panel.
According to the display panel, the repair method for the data lines of the display panel and the liquid crystal display device, the display panel is provided with the first on-off circuit and the second on-off circuit on the upper side and the lower side of the display area respectively, the first on-off circuit and the second on-off circuit conduct the x-th data line with single-point disconnection with the repair line according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line, and therefore when the display panel displays images, the x-th data line with the single-point disconnection is electrically connected with the repair line on the upper side and the lower side of the display area, the data line with the single-point disconnection is automatically repaired, and market competitiveness of the liquid crystal display device is improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a circuit diagram of a display panel of a conventional liquid crystal display device.
Fig. 2 is a schematic circuit diagram of a display panel according to a first embodiment of the invention.
Fig. 3 is a schematic circuit diagram of a display panel according to a second embodiment of the invention.
Fig. 4 is a schematic circuit diagram of a current detection circuit according to a second embodiment of the present invention.
Fig. 5 is a flowchart of a method for repairing a data line of a display panel according to a third embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given to embodiments, methods, steps, structures, features and effects of a display panel, a method for repairing a data line of a display panel and a liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
The embodiment of the invention provides a display panel. Fig. 2 is a schematic circuit diagram of a display panel according to a first embodiment of the invention. As shown in fig. 2, the display panel includes a display area 100, n +2 gate lines, m data lines, a repair line 200, a first switching circuit 300, and a second switching circuit 400, the n +2 gate lines receiving a scan signal provided from an associated gate driving circuit 500, the 1 st gate line G1 of the n +2 gate lines being positioned at an upper side of the display area 100, the 2 nd gate line G2 to the n +1 th gate line Gn +1 being positioned at the display area 100, the n +2 th gate line Gn +2 being positioned at a lower side of the display area 100; the m data lines cross the 2 nd gate line G2 to the n +1 th gate line Gn +1 in the display area 100 to form a plurality of pixel units; the repair line 200 is disposed at the periphery of the display area 100; the first on-off circuit 300 is disposed at a lower side of the display area 100 and is respectively connected to the (n + 2) th gate line Gn +2, the m data lines and the repair line 200, so as to turn on the x-th data line, which is detected to have a single-point disconnection among the m data lines, and the repair line 200 at the lower side of the display area 100 according to a high-level scan signal on the (n + 2) th gate line Gn +2 and a high-level data signal on a corresponding one of the m data lines; the second open circuit 400 is disposed on the upper side of the display area 100 and is respectively connected to the 1 st gate line G1, the m data lines and the repair line 200, so as to conduct the x-th data line, which is detected to have a single-point open line, of the m data lines to the repair line 200 on the upper side of the display area 100 according to a high-level scan signal on the 1 st gate line G1 and a high-level data signal on a corresponding one of the m data lines, where n, m, and x are positive integers, and x is less than or equal to m.
Specifically, the display panel includes n +2 gate lines and m data lines, n and m being positive integers. The n +2 gate lines receive a scan signal supplied from the connected gate driving circuit 500, wherein the 1 st gate line G1 is positioned at an upper side of the display area 100 and transmits the scan signal to the connected second switching circuit 400, the 2 nd to n +1 th gate lines Gn +1 are positioned at the display area 100 and transmit the scan signal to the connected pixel cells, and the n +2 th gate line Gn +2 is positioned at a lower side of the display area 100 and transmits the scan signal to the connected first switching circuit 300. The m data lines receive data signals provided from the connected source driving circuits 600. The present embodiment does not limit the specific locations of the gate driving circuit 500 and the source driving circuit 600, for example, the gate driving circuit 500 may be located at the left or right side of the display area 100, the source driving circuit 600 may be located at the upper or lower side of the display area 100, and so on.
When the gate driving circuit 500 provides a high-level scan signal to the 2 nd gate line G2 to the n +1 th gate line Gn +1, the pixel units in the display area 100 in the display panel sequentially receive the high-level scan signal transmitted by the connected gate lines in rows, turn on Thin Film Transistors (TFTs) in the pixel units, and simultaneously, the source driving circuit 600 provides data signals for displaying images to the m data lines and charges the storage capacitors Cs and the liquid crystal capacitors Clc connected in parallel in the pixel units through the turned-on TFTs. Accordingly, the pixel units may display corresponding gray levels according to the received data signals, and the display panel may display corresponding images in the display area 100.
When the gate driving circuit 500 provides a high-level scan signal to the (n + 2) th gate line Gn +2, the first on-off circuit 300 on the lower side of the display area 100 in the display panel receives the high-level scan signal on the (n + 2) th gate line Gn +2, and meanwhile, a corresponding one of the m data lines receives a high-level data signal and transmits the high-level data signal to the first on-off circuit 300. Accordingly, the first on/off circuit 300 may turn on the x-th data line, which is detected to have a single-dot disconnection among the m data lines, with the repair line 200 at the lower side of the display area 100 according to the high-level scan signal of the n + 2-th gate line Gn +2 and the corresponding high-level data signal on the data line, and then electrically connect the x-th data line with the repair line 200 at the lower side of the display area 100.
When the gate driving circuit 500 provides the high-level scan signal to the 1 st gate line G1, the second on-off circuit 400 on the upper side of the display area 100 in the display panel receives the high-level scan signal on the 1 st gate line G1, and simultaneously, a corresponding one of the m data lines receives the high-level data signal and transmits the high-level data signal to the second on-off circuit 400, so that the second on-off circuit 400 can turn on the x-th data line, which detects the single-point disconnection among the m data lines, and the repair line 200 on the upper side of the display area 100 according to the high-level scan signal on the 1 st gate line G1 and the high-level data signal on the corresponding data line, and then the x-th data line is electrically connected to the repair line 200 on the upper side of the display area 100.
For example, the method for detecting the xth data line with a single-point disconnection can be determined by detecting whether the resistance of the data line is too large, or inputting a voltage at the first end of the data line and detecting whether a current is output at the second end of the data line, and the like.
In an embodiment, the first on/off circuit 300 may include m lower side sub-on/off circuits, and the a-th lower side sub-on/off circuit includes a first switching element 301, a second switching element 302, and a first capacitor 303. The first switching element 301 comprises a first control terminal, a first pass terminal and a second pass terminal, the first control terminal of the first switching element 301 is connected to the (n + 2) th gate line Gn +2, and the first pass terminal of the first switching element 301 is connected to the a-th data line of the m data lines; the second switching element 302 comprises a second control end, a third path end and a fourth path end, the second control end of the second switching element 302 is connected with the second path end of the first switching element 301, the third path end of the second switching element 302 is connected with the a-th data line of the m data lines, and the fourth path end of the second switching element 302 is connected with the repair line 200; a first end of the first capacitor 303 is connected to the second path end of the first switch element 301, and a second end of the first capacitor 303 is grounded, where a is a positive integer and is not greater than m. Specifically, the gate driving circuit 500 provides a scanning signal to the (n + 2) th scanning line, the first on-off circuit 300 receives a high-level scanning signal on the (n + 2) th scanning line, and the first switching elements 301 of the m lower side sub-on-off circuits are in a conducting state because the first control terminals all receive the high-level scanning signal, so that the corresponding first and second via terminals are conducted and electrically connected; meanwhile, a corresponding one of the m data lines is an x-th data line in which a single-point disconnection is detected, the x-th data line receives a high-level data signal, and the other data lines receive a low-level data signal, only the first capacitor 303 of the x-th lower-side sub-on-off circuit is charged to a high-level state by receiving the high-level data signal through the turned-on first switching element 301, wherein the first capacitor 303 may be a single capacitor, or may be a plurality of capacitors connected in parallel as shown in fig. 2. The second switch element 302 is in a conducting state because the second control terminal thereof is connected to the first capacitor 303 in a high level state, so that the corresponding third path terminal and the fourth path terminal are conducted and electrically connected, and the xth data line is electrically connected to the repair line 200 at the lower side of the display area 100. When the gate driving circuit 500 continues to provide the high-level scanning signal to the other gate lines, the first switching element 301 of the xth lower-side sub-on-off circuit is in an off state because the first control terminal does not receive the high-level scanning signal, the first capacitor 303 still maintains the high level, the second switching element 302 still maintains the on state, and the xth data line is still electrically connected to the repair line 200 at the lower side of the display area 100. Here, since the xth data line is a data line for detecting that a single-point disconnection occurs and is also used for receiving a high-level data signal to charge the first capacitor 303 through the turned-on first switching element 301, the high-level data signal on the xth data line needs to be provided through a corresponding signal output circuit disposed on the lower side of the display area 100, and thus the source driving circuit 600 may be disposed on the lower side of the display area 100 to provide the high-level data signal to the xth data line, or another signal output circuit may be disposed on the lower side of the display area 100 to provide the high-level data signal to the xth data line. However, the present embodiment does not limit the first on/off circuit 300 to be disposed only at the lower side of the display area 100, but the first on/off circuit 300 may be disposed at the upper side of the display area 100 by changing the connection of the gate lines, and the data signal of the high level on the x-th data line may be provided through a corresponding circuit disposed at the upper side of the display area 100.
In one embodiment, the second open circuit 400 may include m-1 upper side sub open circuits, and the b-th upper side sub open circuit includes a third switching element 401, a fourth switching element 402, and a second capacitor 403. Wherein the third switching element 401 includes a third control terminal, a fifth path terminal and a sixth path terminal, the third control terminal of the third switching element 401 is connected to the 1 st gate line G1, and the fifth path terminal of the third switching element 401 is connected to the b-th data line of the m data lines; the fourth switching element 402 includes a fourth control terminal, a seventh path terminal and an eighth path terminal, the fourth control terminal of the fourth switching element 402 is connected to the sixth path terminal of the third switching element 401, the seventh path terminal of the fourth switching element 402 is connected to the (b + 1) th data line of the m data lines, and the eighth path terminal of the fourth switching element 402 is connected to the repair line 200; a first end of the second capacitor 403 is connected to the sixth path end of the third switching element 401, and a second end of the second capacitor 403 is grounded, where b is a positive integer and is less than or equal to m-1. Specifically, the gate driving circuit 500 provides a high-level scan signal to the 1 st scan line, and the second on-off circuit 400 receives the high-level scan signal on the 1 st scan line, so that the third switching elements 401 of m-1 upper sub on-off circuits are in a conducting state because the third control terminals all receive the high-level scan signal, and the corresponding fifth and sixth connection terminals are conducted and electrically connected; meanwhile, a corresponding one of the m data lines is an x-1 th data line which is a data line before the x-th data line where the single-point disconnection is detected, the x-1 th data line receives a high-level data signal, and the other data lines receive a low-level data signal, only the second capacitor 403 of the x-1 th upper side sub on-off circuit is charged to a high-level state by receiving the high-level data signal through the turned-on third switching element 401, where the second capacitor 403 may be a single capacitor or a parallel connection of a plurality of capacitors as shown in fig. 2. The fourth switching element 402 is in a conducting state because the fourth control terminal thereof is connected to the second capacitor 403 in a high level state, so that the corresponding seventh via terminal and the eighth via terminal are conducted and electrically connected, and the x-th data line is electrically connected to the repair line 200 at the upper side of the display area 100. When the gate driving circuit 500 continues to provide the high-level scan signal to the other gate lines, the third switching element 401 of the (x-1) th upper-side sub on-off circuit is in an off state because the third control terminal does not receive the high-level scan signal, the second capacitor 403 still maintains the high level, and the fourth switching element 402 still maintains the on state, so that the (x) th data line is still electrically connected to the repair line 200 at the upper side of the display area 100. Here, since the x-th data line is a data line in which a single-point disconnection is detected, and the x-1 th data line is a data line in which a disconnection is not detected, and the x-1 th data line receives a high-level data signal to charge the second capacitor 403 through the turned-on third switching element 401, the high-level data signal on the x-1 th data line may be provided through a circuit disposed on the upper side or the lower side of the display area 100, and thus the source driving circuit 600 may be disposed on the upper side or the lower side of the display area 100 to provide the high-level data signal to the x-1 th data line, or a corresponding signal output circuit may be disposed on the upper side or the lower side of the display area 100 to provide the high-level data signal to the x-1 th data line. However, the second shutdown circuit 400 is not limited to be disposed only on the upper side of the display area 100 in the present embodiment, and the second shutdown circuit 400 may be disposed only on the lower side of the display area 100 by changing the connection of the gate lines.
In one embodiment, the high-level data signal on a corresponding one of the m data lines received by the first switching circuit 300 and the high-level data signal on a corresponding one of the m data lines received by the second switching circuit 400 can be provided by the source driving circuit 600. After detecting and determining that the data line with the single-point disconnection is the xth data line, the source driving circuit 600 may be programmed accordingly, such that when the gate driving circuit 500 provides the high-level scan signal to the 1 st gate line G1 or the n +2 th gate line Gn +2, the source driving circuit 600 provides the high-level data signal to a corresponding one of the m data lines, and does not provide the data signal to the other data lines of the m data lines. Accordingly, the first and second on/off circuits 300 and 400 may conduct the x-th data line, which is detected to have a single-point disconnection among the m data lines, to the repair line 200 on the upper and lower sides of the display area 100 according to the high-level scan signal on the corresponding gate line and the high-level data signal on the corresponding data line, and then the x-th data line may be electrically connected to the repair line 200 on the upper and lower sides of the display area 100. However, the present embodiment is not limited thereto, and other signal output circuits may also provide the high-level data signal to a corresponding one of the m data lines, which all belong to the protection scope of the present embodiment.
In this embodiment, when the display panel displays an image, the gate driving circuit 500 provides a scanning signal to n +2 gate lines, and the scanning direction may be a forward scanning direction or a reverse scanning direction. In the forward direction scanning, the gate driving circuit 500 may first provide a high-level scanning signal to a gate line in the display area 100, for example, the 2 nd gate line G2, or may first provide a high-level scanning signal to a gate line outside the display area 100, for example, the n +2 th gate line Gn +2 or the 1 st gate line G1; for example, in one embodiment, the gate driving circuit 500 may sequentially supply a high-level scan signal to the 2 nd gate line G2, the … … n +2 th gate line Gn +1, the n +2 th gate line Gn +2, and the 1 st gate line G1; in one embodiment, the gate driving circuit 500 may sequentially provide a high-level scan signal to the (n + 2) th gate line Gn +2, the 1 st gate line G1, the 2 nd gate lines G2, … … and the (n + 1) th gate line Gn + 1; in one embodiment, the gate driving circuit 500 may sequentially provide the 1 st gate line G1, the 2 nd gate lines G2, … …, and the n +2 th gate line Gn +2 with a high-level scan signal. In the reverse scan, the gate driving circuit 500 may first provide a high-level scan signal to a gate line of the display area 100, for example, the (n + 1) th gate line Gn +1, or may first provide a high-level scan signal to a gate line outside the display area 100, for example, the (n + 2) th gate line Gn +2 or the (1) th gate line G1, and in one embodiment, the gate driving circuit 500 may sequentially provide high-level scan signals to the (n + 1) th gate line Gn +1, the (… …) 2 nd gate line G2, the (1) st gate line G1, and the (n + 2) th gate line Gn + 2; in one embodiment, the gate driving circuit 500 may sequentially supply a high-level scan signal to the 1 st gate line G1, the n +2 th gate line Gn +2, the n +1 th gate line Gn +1 … …, and the 2 nd gate line G2; in one embodiment, the gate driving circuit 500 may sequentially supply the n +2 th gate line Gn +2, the n +1 th gate line Gn +1, … …, and the 1 st gate line G1 with a high-level scan signal.
However, no matter how the gate driving circuit 500 provides the scanning signals to the n +2 gate lines, after the gate driving circuit 500 completes one-time integral scanning, the first on-off circuit 300 and the second on-off circuit 400 conduct the x-th data line with the single-point disconnection with the repair line 200 according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line, that is, the x-th data line with the single-point disconnection is electrically connected with the repair line 200 at the upper and lower sides of the display area 100 through the first on-off circuit 300 and the second on-off circuit 400. Therefore, when displaying a subsequent image, the x-th data line of the single-point broken line may be directly transmitted to the corresponding pixel unit through the data line after receiving the data signal for image display on the upper side (or the lower side) of the display area 100, or the data signal may be transmitted through the first on-off circuit 300, the repair line 200, and the second on-off circuit 400, and transmitted to the data line on the lower side (or the upper side) of the display area 100, and then directly transmitted to the corresponding pixel unit through the data line, thereby implementing the single-point broken line repair of the data line.
In the display panel of this embodiment, the first on-off circuit 300 and the second on-off circuit 400 are respectively disposed on the upper side and the lower side of the display area 100, and the first on-off circuit 300 and the second on-off circuit 400 conduct the xth data line with a single-point broken line with the repair line 200 according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line, so that when the display panel displays an image, the xth data line with the single-point broken line is electrically connected with the repair line 200 on the upper side and the lower side of the display area 100, thereby realizing automatic repair of the data line with the single-point broken line, and increasing the market competitiveness of the liquid crystal display device.
Second embodiment
Fig. 3 is a schematic circuit diagram of a display panel according to a second embodiment of the invention. The display panel of the present embodiment has substantially the same structure as the display panel of the first embodiment, except that: the display panel further includes a current detection circuit 700, and the current detection circuit 700 is connected to the m data lines and configured to determine an xth data line where a single-point disconnection occurs by detecting currents of the m data lines.
Specifically, the current detection circuit 700 is connected to m data lines, and the current detection circuit 700 can detect the current on the m data lines, so that, when a single-point disconnection occurs on a data line, the xth data line where the single-point disconnection occurs is determined according to a significantly smaller detection value among the detection values of the current on the m data lines.
In one embodiment, m data lines receive data signals of the same voltage at one side of the display area 100, the current detection circuit 700 detects currents on the m data lines connected at the other side of the display area 100, and the x-th data line where a single-point disconnection occurs is determined according to a significantly smaller detection value among the current detection values of the m data lines. In this embodiment, if the source driving circuit 600 provides data signals with the same voltage to m data lines, the current detection circuit 700 and the source driving circuit 600 are disposed opposite to each other on the upper and lower sides of the display area 100.
In another embodiment, first, the display area 100 displays an image with uniform brightness, for example, m data lines may receive data signals with the same voltage and transmit the data signals with the same voltage to the connected pixel units, and the image displayed in the display area 100 may be a pure white image. Then, n +2 scan lines sequentially receive the high-level scan signal to turn on the thin film transistors in all the pixel units in the display area 100, so that the pixel units can release charges from the storage capacitors and the liquid crystal capacitors in the pixel units through the electrically connected data lines to form corresponding currents to the current detection circuit 700, wherein the n +2 scan lines can simultaneously receive the high-level scan signal by triggering the XON function of the gate driving circuit 500, and the gate driving circuit 500 can trigger the XON function multiple times to enable the current detection circuit 700 to sequentially detect the currents of the m data lines. Finally, the current detection circuit 700 detects the current of the m data lines to determine the xth data line with a single-point disconnection, that is, because the xth data line has a single-point disconnection, only a few pixel units can release the charges from the storage capacitor and the liquid crystal capacitor in the pixel units through the electrically connected data lines to form corresponding current to the current detection circuit 700, compared with other data lines without disconnection. Therefore, the current detection circuit 700 can determine the xth data line where the single-point disconnection occurs, based on the significantly smaller detection value among the current detection values of the m data lines. In this embodiment, the current detection circuit 700 is not limited to be located on the upper side or the lower side of the display area 100, and it is understood that the current detection circuit 700 may also be disposed in the source driving circuit 600, that is, the source driving circuit 600 may include the current detection circuit 700.
Fig. 4 is a schematic circuit diagram of a current detection circuit according to a second embodiment of the present invention. IN one embodiment, the current detection circuit 700 includes a detection input terminal IN, a first detection unit J1, a first amplifier a1, a second amplifier a2, and a detection output terminal OUT; the detection input terminal IN is grounded through a first resistor R1; the non-inverting input terminal of the first amplifier a1 is grounded through a second resistor R2 and also through a third resistor R3, and the inverting input terminal of the first amplifier a1 is connected to the detection input terminal IN through a fourth resistor R4 and also connected to the output terminal of the first amplifier a1 through a fifth resistor R5; the non-inverting input terminal of the second amplifier a2 is grounded through a sixth resistor R6, the inverting input terminal of the second amplifier a2 is connected to the output terminal of the first amplifier a1 through a seventh resistor R7, and is also connected to the output terminal of the second amplifier a2 through an eighth resistor R8; the detection output OUT is connected to the output of the second amplifier a 2.
Specifically, the detection input terminal IN is connected to a corresponding data line of the m data lines, so that the detection input terminal IN can receive a current of the corresponding data line of the m data lines, the current passes through the first resistor R1 and then is shunted, the first shunt path is grounded, and the second shunt path passes through the second resistor R2 and then enters the ground terminal after passing through the third resistor R3. Meanwhile, the first amplifier a1 and the second amplifier a2 both have the function of voltage amplification, and the voltage amplification factor is related to the feedback circuit. According to the principle of the amplifier virtual short, the non-inverting input terminal of the first amplifier a1 and the inverting input terminal of the first amplifier a1 are necessarily the same in voltage, and the non-inverting input terminal of the second amplifier a2 and the inverting input terminal of the second amplifier a2 are necessarily the same in voltage. Therefore, the voltage amplification factor of the first amplifier a1 is close to the resistance ratio of the negative fifth resistor R5 to the fourth resistor R4, and the voltage amplification factor of the second amplifier a2 is the resistance ratio of the negative eighth resistor R8 to the seventh resistor R7, so that the voltage obtained by amplifying the voltage of the detection input end twice is input to the detection output end OUT, and the current detection value or the voltage detection value obtained at the detection output end can be detected to determine the current magnitude of the corresponding data line. Therefore, when the m data lines are respectively connected to the detection input end IN, m voltage detection values can be obtained at the detection output end OUT, and the x-th data line with single-point disconnection can be judged and obtained through a smaller current detection value or a smaller voltage detection value.
In one embodiment, after the current detection circuit 700 detects the x-th data line that determines the single-point disconnection, the detection result is input to the source driving circuit 600, so that the source driving circuit 600 can be programmed accordingly, such that when the gate driving circuit 500 provides the high-level scan signal to the 1 st gate line G1 or the n +2 th gate line Gn +2, the source driving circuit 600 provides the high-level data signal to a corresponding one of the m data lines, and provides the low-level data signal to the other data lines of the m data lines.
In one embodiment, after the current detection circuit 700 detects the x-th data line that determines the single-point disconnection, it is programmed accordingly according to the detection result, so that when the gate driving circuit 500 provides the high-level scan signal to the 1 st gate line G1 or the n +2 th gate line Gn +2, the current detection circuit 700 provides the high-level data signal to a corresponding one of the m data lines and provides the low-level data signal to the other data lines of the m data lines.
The display panel of the embodiment includes the current detection circuit 700, which can detect and determine the x-th data line of the single-point broken line first, and then the x-th data line of the single-point broken line is conducted with the repair line 200 according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line through the first on-off circuit 300 and the second on-off circuit 400 respectively disposed on the upper and lower sides of the display area 100, so that when the display panel displays images, the x-th data line of the single-point broken line is electrically connected with the repair line 200 on the upper and lower sides of the display area 100, thereby realizing the automatic repair of the data line of the single-point broken line, and increasing the market competitiveness of the liquid crystal display device.
Third embodiment
Fig. 5 is a flowchart of a method for repairing a data line of a display panel according to a third embodiment of the present invention. As shown in fig. 5, the present embodiment provides a method for repairing a data line of a display panel according to the foregoing embodiment, including:
s1, the n +2 gate lines receive the scan signals provided by the gate driving circuit 500;
s2, when the 1 st gate line G1 or the n +2 th gate line Gn +2 receives a high-level scan signal, a corresponding one of the m data lines receives a high-level data signal;
s3, the first on-off circuit 300 turns on the x-th data line and the repair line 200 at the lower side of the display area 100 according to the high-level scan signal on the n + 2-th gate line Gn +2 and the high-level data signal on the corresponding one of the m data lines;
s4, the second turn-on circuit 400 turns on the x-th data line and the repair line 200 at the upper side of the display area 100 according to the high-level scan signal on the 1 st gate line G1 and the high-level data signal on the corresponding one of the m data lines.
In one embodiment, the display panel includes a current detection circuit 700, and the repairing method further includes the steps of: the display panel displays an image with uniform brightness in the display area 100; n +2 grid lines sequentially receive high-level scanning signals; the current detection circuit 700 detects the current of the m data lines to determine the x-th data line of the single-point disconnection.
For the specific implementation of this embodiment, reference may be made to the implementation of the display panel described above, and details are not described here.
In the method for repairing a data line of a display panel according to the present embodiment, the first on-off circuit 300 and the second on-off circuit 400 conduct the xth data line with a single-point disconnection with the repair line 200 according to the high-level scan signal on the corresponding gate line and the high-level data signal on the corresponding data line, so that when the display panel performs image display, the xth data line with the single-point disconnection is electrically connected with the repair line 200 at the upper and lower sides of the display area 100, thereby realizing automatic repair of the data line with the single-point disconnection, and increasing the market competitiveness of the liquid crystal display device.
Fourth embodiment
The embodiment of the invention also provides a liquid crystal display device based on the same inventive concept, and the liquid crystal display device comprises the display panel of the embodiment. For the specific implementation of this embodiment, reference may be made to the implementation of the display panel described above, and details are not described here.
In the liquid crystal display device of this embodiment, the first on-off circuit 300 and the second on-off circuit 400 are respectively disposed on the upper side and the lower side of the display area 100 of the display panel, and the first on-off circuit 300 and the second on-off circuit 400 conduct the xth data line with a single-point disconnection with the repair line 200 according to the high-level scanning signal on the corresponding gate line and the high-level data signal on the corresponding data line, so that when the display panel displays an image, the xth data line with the single-point disconnection is electrically connected with the repair line 200 on the upper side and the lower side of the display area 100, thereby realizing automatic repair of the data line with the single-point disconnection, and increasing the market competitiveness of the liquid crystal display device.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A display panel, comprising:
a display area (100);
n +2 gate lines, the n +2 gate lines receiving a scan signal provided by a gate driving circuit (500) connected thereto, a1 st gate line of the n +2 gate lines being located at an upper side of the display region (100), a2 nd gate line to an n +1 th gate line being located at the display region (100), the n +2 th gate line being located at a lower side of the display region (100);
m data lines crossing the 2 nd to the n +1 th gate lines to form a plurality of pixel units in the display area (100);
a repair line (200), the repair line (200) being disposed at a periphery of the display area (100);
the first on-off circuit (300) is arranged on the lower side of the display area (100), and is respectively connected with the (n + 2) th gate line, the m data lines and the repair line (200) so as to conduct the x-th data line, which detects the occurrence of single-point broken line, of the m data lines and the repair line (200) on the lower side of the display area (100) according to a high-level scanning signal on the (n + 2) th gate line and a high-level data signal on a corresponding one of the m data lines;
and the second on-off circuit (400) is arranged on the upper side of the display area (100) and is respectively connected with the 1 st gate line, the m data lines and the repair line (200) so as to conduct the x-th data line and the repair line (200) on the upper side of the display area (100) according to a high-level scanning signal on the 1 st gate line and a high-level data signal on a corresponding data line in the m data lines, wherein n, m and x are positive integers, and x is not more than m.
2. The display panel according to claim 1, wherein the first on/off circuit (300) comprises m lower side sub on/off circuits, and the a lower side sub on/off circuit comprises:
a first switching element (301), wherein the first switching element (301) comprises a first control terminal, a first pass terminal and a second pass terminal, the first control terminal of the first switching element (301) is connected with the (n + 2) th gate line, and the first pass terminal of the first switching element (301) is connected with the a-th data line of the m data lines;
a second switching element (302), wherein the second switching element (302) comprises a second control end, a third path end and a fourth path end, the second control end of the second switching element (302) is connected with the second path end of the first switching element (301), the third path end of the second switching element (302) is connected with the a-th data line of the m data lines, and the fourth path end of the second switching element (302) is connected with the repair line (200);
a first end of the first capacitor (303) is connected with a second path end of the first switch element (301), a second end of the first capacitor (303) is grounded, wherein a is a positive integer and is not more than m.
3. The display panel according to claim 1, wherein the second on/off circuit (400) comprises m-1 upper sub on/off circuits, and the b-th upper sub on/off circuit comprises:
a third switching element (401), the third switching element (401) including a third control terminal, a fifth path terminal and a sixth path terminal, the third control terminal of the third switching element (401) being connected to the 1 st gate line, the fifth path terminal of the third switching element (401) being connected to the b-th data line of the m data lines;
a fourth switching element (402), the fourth switching element (402) including a fourth control terminal, a seventh path terminal, and an eighth path terminal, the fourth control terminal of the fourth switching element (402) being connected to the sixth path terminal of the third switching element (401), the seventh path terminal of the fourth switching element (402) being connected to the (b + 1) th data line of the m data lines, the eighth path terminal of the fourth switching element (402) being connected to the repair line (200);
a second capacitor (403), wherein a first end of the second capacitor (403) is connected to a sixth path end of the third switching element (401), a second end of the second capacitor (403) is grounded, b is a positive integer, and b is not less than m-1.
4. The display panel according to claim 1, wherein the high level data signal on the corresponding one of the m data lines received by the first switching circuit (300) and the high level data signal on the corresponding one of the m data lines received by the second switching circuit (400) are both provided by a source driving circuit (600).
5. The display panel according to claim 1, wherein the display panel comprises a current detection circuit (700), and the current detection circuit (700) is connected to the m data lines and configured to detect the current of the m data lines to determine the x-th data line where the single-point disconnection occurs.
6. The display panel according to claim 5, wherein the current detection circuit (700) comprises:
a detection Input (IN) which is connected to ground via a first resistor (R1);
a first amplifier (a1), a non-inverting input of the first amplifier (a1) being connected to ground through a second resistor (R2) and also through a third resistor (R3), an inverting input of the first amplifier (a1) being connected to the detection Input (IN) through a fourth resistor (R4) and also being connected to an output of the first amplifier (a1) through a fifth resistor (R5);
a second amplifier (a2), a non-inverting input of the second amplifier (a2) being connected to ground through a sixth resistor (R6), an inverting input of the second amplifier (a2) being connected to the output of the first amplifier (a1) through a seventh resistor (R7) and to the output of the second amplifier (a2) through an eighth resistor (R8);
a detection Output (OUT) connected to an output of the second amplifier (A2).
7. The display panel according to claim 5, wherein the high level data signal on the corresponding one of the m data lines received by the first switching circuit (300) and the high level data signal on the corresponding one of the m data lines received by the second switching circuit (400) are both provided by the current detection circuit (700).
8. A method for repairing a data line of a display panel according to any one of claims 1 to 7, comprising the steps of:
the n +2 grid lines receive scanning signals provided by the connected grid driving circuit (500);
when the 1 st gate line or the (n + 2) th gate line receives a scan signal of a high level, a corresponding one of the m data lines receives a data signal of a high level;
the first on-off circuit (300) conducts the x-th data line and the repair line (200) at the lower side of the display area (100) according to a high-level scanning signal on the n + 2-th gate line and a high-level data signal on a corresponding data line in the m data lines;
the second on-off circuit (400) turns on the x-th data line and the repair line (200) at the upper side of the display area (100) according to a high-level scan signal on the 1 st gate line and a high-level data signal on a corresponding one of the m data lines.
9. The method for repairing data lines of a display panel according to claim 8, wherein the display panel comprises a current detection circuit (700), the method further comprising the steps of:
the display panel displays an image with uniform brightness in the display area (100);
the n +2 grid lines sequentially receive high-level scanning signals;
the current detection circuit (700) detects the current of the m data lines to determine the x-th data line.
10. A liquid crystal display device comprising the display panel according to any one of claims 1 to 7.
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