CN109697938B - Display panel, preparation method, detection method and display device - Google Patents
Display panel, preparation method, detection method and display device Download PDFInfo
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- CN109697938B CN109697938B CN201910066910.2A CN201910066910A CN109697938B CN 109697938 B CN109697938 B CN 109697938B CN 201910066910 A CN201910066910 A CN 201910066910A CN 109697938 B CN109697938 B CN 109697938B
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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
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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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
- G02F1/136254—Checking; Testing
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Abstract
The invention discloses a display panel, a preparation method, a detection method and a display device.A detection transistor is arranged between a detection signal line and a corresponding driving signal line, and a first switch transistor is arranged to control all the detection transistors to be conducted in a lighting detection stage so as to provide a lighting detection signal for a display area to light the display panel. In the reliability detection stage, all the detection transistors are controlled to be turned off by signals loaded by the third control signal line, so that the detection signal line and the driving signal line are isolated and disconnected by the detection transistors, the influence on the transmission of signals in the driving signal line due to the extension of the corrosion position of the detection signal line can be avoided, and the display abnormity is further avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method, a detection method and a display device.
Background
With the development of display panel production technology, large-scale automatic production era has been entered. After the display panel is manufactured, the display panel may have defects, and thus, the quality of the display panel needs to be checked. In order to avoid the increase in cost, a lighting test is performed before a driver IC (Integrated Circuit), a PCB (Printed Circuit Board), and an FPC (Flexible Printed Circuit Board) are assembled on the display panel. The structure of the display panel corresponding to the lighting test stage, as shown in fig. 1, may include a substrate 100, a plurality of driving signal lines 110 for inputting driving signals to the display area AA, driving terminals 111 electrically connected to the driving signal lines 110 in a one-to-one correspondence, a plurality of detection signal lines 120 for inputting lighting detection signals, and detection terminals 121 electrically connected to the detection signal lines 120 in a one-to-one correspondence. One driving signal line 110 is connected to one detection signal line 120. In the lighting test phase, the detection terminal 121 electrically connected to the detection signal line 120 is electrically connected to the lighting fixture, so that the lighting detection signal is input to the detection signal line 120, thereby controlling the display area AA to be lit, and detecting whether the display panel is defective. If no defect is found at the lighting inspection stage, the substrate base 100 is cut along the scribe line CG so as to remove the inspection terminal 121, as shown in fig. 2. Then, the driving terminals 111 in the display panel shown in fig. 2 are electrically connected to elements such as a driving IC and a PCB through an FPC, so that the display panel is assembled with the elements such as the driving IC, the FPC, and the PCB.
Since the display panel may operate in some special environments (e.g., high temperature and high humidity environments), after the driver IC, the FPC, and the PCB are assembled, a reliability test of the display panel at a certain temperature and a certain humidity is required to detect whether signal transmission between the display panel and the driver IC, the FPC, and the PCB is poor, so as to further ensure the quality of the display panel. However, the cutting does not completely remove the detection signal line 120, and thus a part of the detection signal line 120 remains. And the remaining sensing signal line 120 is flush with the edge of the substrate base plate 100, so that the remaining sensing signal line 120 may be directly contacted with water oxygen. This causes corrosion of the remaining detection signal lines 120 when the reliability of the display panel is tested. In addition, as the water and oxygen continuously enter, the corrosion position may also continuously extend, and when the corrosion position extends to the connection between the detection signal line 120 and the driving signal line 110, the transmission of the electrical signal in the driving signal line 110 may be affected, thereby causing problems such as abnormal display.
Disclosure of Invention
The embodiment of the invention provides a display panel, a preparation method, a detection method and a display device, which are used for avoiding the influence of corrosion on the display panel.
An embodiment of the present invention provides a display panel, including: the display panel comprises a substrate base plate, a plurality of driving signal lines and detection signal lines, wherein the driving signal lines are positioned on the substrate base plate and used for inputting driving signals to a display area of the display panel, the detection signal lines are electrically connected with the driving signal lines in a one-to-one correspondence mode, and the display panel further comprises: a first switching transistor, a first control signal line, a second control signal line, a third control signal line, and detection transistors corresponding to the detection signal lines one to one; each detection signal line is electrically connected with the corresponding driving signal line through the corresponding detection transistor;
the gate of the first switching transistor is electrically connected to the first control signal line, the first pole of the first switching transistor is electrically connected to the second control signal line, and the second pole of the first switching transistor is electrically connected to the third control signal line and the gates of all the detection transistors, respectively.
Optionally, in an embodiment of the present invention, the display panel further includes: a second switching transistor, a fourth control signal line, and a fifth control signal line; a second pole of the first switching transistor is electrically connected with a gate of each of the detection transistors through the second switching transistor;
the gate of the second switching transistor is electrically connected to the second pole of the first switching transistor and the fourth control signal line, the first pole of the second switching transistor is electrically connected to the fifth control signal line, and the second pole of the second switching transistor is electrically connected to the gate of each of the detection transistors.
Optionally, in an embodiment of the present invention, each of the detection transistors is a P-type transistor, and the fifth control signal line is electrically connected to a detection signal line for loading a low-level signal in the detection signal line; alternatively, the first and second electrodes may be,
each detection transistor is an N-type transistor, and the fifth control signal line is electrically connected with a detection signal line for loading a high-level signal in the detection signal line.
Optionally, in an embodiment of the present invention, the fourth control signal line and each of the driving signal lines are made of the same material in the same layer.
Optionally, in an embodiment of the present invention, the driving signal line and the detecting signal line are disposed in different layers.
Optionally, in an embodiment of the present invention, the third control signal line and each of the driving signal lines are the same in material and layer; and/or the presence of a gas in the gas,
the first control signal line, the second control signal line, each detection signal line and the gates of all the transistors are made of the same material in the same layer.
Optionally, in an embodiment of the present invention, the second control signal line is a broken line; and/or the material of the active layer of all the transistors is polysilicon.
Correspondingly, the embodiment of the invention also provides a display device, which comprises the display panel and the driving circuit; wherein the driving circuit is electrically connected to each of the driving signal lines and the third control signal line, respectively.
Optionally, in the embodiment of the present invention, the driving circuit is further electrically connected to a fourth control signal line.
Correspondingly, the embodiment of the invention also provides a preparation method of the display panel, which comprises the following steps:
patterns of each driving signal line, each detection signal line, the first control signal line, the second control signal line, the third control signal line, the first switching transistor and each detection transistor are formed on the substrate respectively.
Optionally, in an embodiment of the present invention, the preparation method further includes: and forming patterns of the second switching transistor, the fourth control signal line and the fifth control signal line on the substrate base plate respectively.
Correspondingly, an embodiment of the present invention further provides a method for detecting the display panel, including:
in a lighting detection stage, loading a first control signal of a first level to the first control signal line, loading a second control signal of the first level to the second control signal line, and loading a corresponding lighting detection signal to each detection signal line to control the conduction of the first switch transistor, control the conduction of each detection transistor, and control the lighting of the display panel;
and in the reliability detection stage, a third control signal with a second level is loaded on the third control signal line, and a corresponding driving signal is loaded on each driving signal line so as to control each detection transistor to be turned off and control the display panel to be turned on.
Optionally, in an embodiment of the present invention, in the lighting detection stage, the detection method further includes: loading a fifth control signal of a first level to the fifth control signal line;
in the reliability detection phase, the detection method further includes: and loading a fourth control signal of a second level to the fourth control signal line.
The invention has the following beneficial effects:
according to the display panel, the preparation method, the detection method and the display device provided by the embodiment of the invention, the detection transistor is arranged between the detection signal line and the corresponding driving signal line, and the first switch transistor is arranged to control all the detection transistors to be conducted in the lighting detection stage, so that the lighting detection signal is provided for the display area to light the display panel. In the reliability detection stage, all the detection transistors are controlled to be turned off by signals loaded by the third control signal line, so that the detection signal line and the driving signal line are isolated and disconnected by the detection transistors, the influence on the transmission of signals in the driving signal line due to the extension of the corrosion position of the detection signal line can be avoided, and the display abnormity is further avoided.
Drawings
FIG. 1 is a schematic top view of a display panel in the prior art;
FIG. 2 is a second schematic diagram of a top view structure of a display panel in the prior art;
fig. 3 is a schematic top view of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of the display panel shown in FIG. 3;
fig. 5 is a second schematic top view of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of the display panel shown in fig. 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of a display panel, a manufacturing method, a detection method and a display device according to embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the thickness and shape of each layer of film in the drawings do not reflect the true scale of the array substrate, and are only for the purpose of schematically illustrating the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
A display panel generally includes a plurality of gate lines, a plurality of data lines, and pixel units defined by the gate lines and the data lines. The grid lines are electrically connected with the grid driving circuit so as to input grid scanning signals to the grid lines through the grid driving circuit and control the pixel units connected with each grid line to be opened. The data line is electrically connected with the source electrode driving circuit so as to input a data signal through the source electrode driving circuit, so that the display panel realizes the display effect. Therefore, some of the driving signal lines may be used to transmit signals such as a clock signal CLK, a frame trigger signal STV, a high voltage signal VGH, and a low voltage signal VGL, which are input to the gate driving circuit, so as to control the gate driving circuit to output a gate scanning signal to the gate lines for scanning driving. The other part of the driving signal lines may be used to transmit a data control signal input to the source driving circuit to control the source driving circuit to output a data signal to the data lines. Generally, a circuit or a driver IC on a PCB inputs signals such as a clock signal CLK, a frame trigger signal STV, a high voltage signal VGH, and a low voltage signal VGL to a gate driving circuit through a driving signal line to control the gate driving circuit to output a gate scanning signal to a gate line. And inputting a signal to the source driving circuit through the driving signal line to control the source driving circuit to output a data signal to the data line. Of course, in practical applications, the signal input to the gate driving circuit and the signal input to the source driving circuit may also include other signals in the prior art, and are not limited herein.
Some display panels provided in the embodiments of the present invention, as shown in fig. 3, may include: the display device includes a substrate 100, a plurality of driving signal lines 110 disposed on the substrate 100 for inputting driving signals to a display area AA of the display panel, and detection signal lines 120 electrically connected to the driving signal lines 110 in a one-to-one correspondence. The display panel may further include: a first switching transistor M1, a first control signal line 130, a second control signal line 140, a third control signal line 150, and a detection transistor M0 corresponding one-to-one to each detection signal line 110; each detection signal line 120 is electrically connected to the corresponding drive signal line 110 via the corresponding detection transistor M0. The gate of the first switching transistor M1 is electrically connected to the first control signal line 130, the first pole of the first switching transistor M1 is electrically connected to the second control signal line 140, and the second pole of the first switching transistor M1 is electrically connected to the third control signal line 150 and the gates of all the detection transistors M0, respectively. The first electrode of each detection transistor M0 is electrically connected to the corresponding detection signal line 120, and the second electrode of each detection transistor M0 is electrically connected to the corresponding driving signal line 110.
The display panel provided by the embodiment of the invention provides the lighting detection signal for the display area to light the display panel by arranging the detection transistor between the detection signal line and the corresponding driving signal line and arranging the first switching transistor to control all the detection transistors to be conducted in the lighting detection stage. In the reliability detection stage, all the detection transistors are controlled to be turned off by signals loaded by the third control signal line, so that the detection signal line and the driving signal line are isolated and disconnected by the detection transistors, the influence on the transmission of signals in the driving signal line due to the extension of the corrosion position of the detection signal line can be avoided, and the display abnormity is further avoided.
In the lighting detection stage, a first control signal of a first level may be applied to the first control signal line, a second control signal of the first level may be applied to the second control signal line, and a lighting detection signal corresponding to each detection signal line may be applied to control the first switching transistor to be turned on, control each detection transistor to be turned on, and control the display panel to be lit, so as to perform lighting detection on the display panel. The lighting detection signal is inputted to the display area AA of the display panel through the detection signal line 120, and may include signals such as a clock signal CLK, a frame trigger signal STV, a high voltage signal VGH, and a low voltage signal VGL inputted to the gate driving circuit, and a data signal inputted to the data line. In the reliability detection stage, the third control signal of the second level may be applied to the third control signal line, and the corresponding driving signal may be applied to each driving signal line to control each detection transistor to be turned off and to control the display panel to be turned on, so as to perform reliability detection on the display panel. The driving signal may include a clock signal CLK, a frame trigger signal STV, a high voltage signal VGH, a low voltage signal VGL, and the like, which are input to the gate driving circuit, and a data signal input to the data line.
In a specific implementation, each detection signal line 120 is electrically connected to the corresponding driving signal line 110 through the corresponding detection transistor M0, and the detection signal line 120 to which the same signal is input in the lighting detection stage and the reliability detection stage may be electrically connected to the driving signal line 110. For example, the detection signal line 120 for transmitting the frame trigger signal STV during the lighting detection phase is electrically connected to the driving signal line 110 for transmitting the frame trigger signal STV during the reliability detection phase, the detection signal line 120 for transmitting the high voltage signal VGH during the lighting detection phase is electrically connected to the driving signal line 110 for transmitting the high voltage signal VGH during the reliability detection phase, and so on, and the rest is not repeated herein.
It should be noted that, since the second control signal line needs to input the second control signal in the lighting detection stage, before the display panel is cut, the second control signal line is also electrically connected to one of the detection terminals 121 shown in fig. 1, so that the second control signal is input to the second control signal line through the detection terminal 121. Therefore, after the display panel is cut, a part of the second control signal lines are remained, so that the remained second control signal lines are directly contacted with water and oxygen to cause corrosion. Because the first switch transistor is arranged between the second control signal line and the third control signal line, the adverse effect of corrosion of the second control signal line on the third control signal line can be avoided through the separation effect of the first switch transistor.
In practical implementation, in the embodiment of the present invention, as shown in fig. 3, the second control signal line 140 may be provided in a zigzag shape. This can extend the length of the second control signal line 140 to delay the time that the corrosion of the second control signal line 140 extends to the first switching transistor.
In a specific implementation, the materials of the driving signal line, the detection signal line, the first control signal line, the second control signal line, and the third control signal line may be made of a conductive material, such as metal, ITO, or the like.
Polysilicon (p-Si) is a semiconductor material, and compared with conductive materials such as metal and ITO, p-Si is not easy to generate electrochemical corrosion. In practical implementation, in the embodiment of the present invention, the material of the active layer of all the transistors may be made of polysilicon. Thereby further avoiding the influence of corrosion on the driving signal lines.
In a specific implementation, the first pole of each switch transistor is used as the source electrode, and the second pole is used as the drain electrode; alternatively, the first pole is used as the drain thereof, and the second pole is used as the source thereof, which are not specifically distinguished herein.
The common P-type transistor is cut off under the action of high level and is switched on under the action of low level; the N-type transistor is turned on under the action of high level and turned off under the action of low level. In practical implementation, in the embodiment of the present invention, as shown in fig. 3, the first switching transistor and each of the detection transistors may be configured as a P-type transistor. Thus the first level may be set to a low level and the second level to a high level. Alternatively, the first switching transistor and each of the detection transistors may be provided as N-type transistors. Thus the first level may be set to a high level and the second level to a low level. This is determined by design according to the actual application environment, and is not limited herein.
Further, it is general that each driving signal line is provided with the same material in the same layer, and each detecting signal line is provided with the same material in the same layer. In order to avoid the influence of corrosion of the driving signal line on the detection signal line, in a specific implementation, as shown in fig. 4, the driving signal line 110 and the detection signal line 120 may be disposed in different layers. This can prevent water and oxygen from contacting the driving signal line through the gap between the layers.
Further, in the embodiment of the present invention, as shown in fig. 4, in a specific implementation, the third control signal line 150 and each driving signal line 110 may be made of the same material in the same layer, so that the patterns of the third control signal line 150 and each driving signal line 110 may be formed through a one-step patterning process, which may simplify a manufacturing process, save a manufacturing cost, and improve a production efficiency.
Further, in the embodiment of the present invention, the first control signal line 130, the second control signal line 140, and the detection signal lines 120 may be made of the same material in the same layer, so that the patterns of the first control signal line 130, the second control signal line 140, and the detection signal lines 120 may be formed through a one-step composition process, which may simplify a manufacturing process, save a manufacturing cost, and improve a production efficiency.
In a specific implementation, each of the transistors may be provided by a top-gate transistor structure or a bottom-gate transistor structure, which is not limited herein. Taking a top gate type structure as an example, as shown in fig. 4, the active layer 210 of the sensing transistor M0 and the active layer 310 of the first switch transistor M1 are disposed on the substrate 100 in the same layer and material, the side of the active layer 210 away from the substrate 100 is provided with a layer where the first insulating layer 410 is located, the side of the layer where the first insulating layer 410 is located away from the substrate 100 is provided with the gate 220 of the sensing transistor M0, the gate 320 of the first switch transistor M1, the sensing signal line 120, the first control signal line 130 and the second control signal line 140, the side of the layer where the gate 220 is located away from the substrate 100 is provided with a layer where the second insulating layer 420 is located, the side of the layer where the second insulating layer 420 is located away from the substrate 100 is provided with a layer where the third control signal line 150 and the driving signal line 110 are located, the side of the layer where the driving signal line 110 is located away from the substrate 100 is provided with a layer of the third insulating layer 430, on the side of the layer on which the third insulating layer 430 is located facing away from the substrate 100, the first and second poles 231, 232 of the detection transistor M0, and the first and second poles 331, 332 of the first switching transistor M1 are arranged. The first pole 231 of the sensing transistor M0 is electrically connected to the sensing signal line 120 through a via penetrating through the third insulating layer 430 and the second insulating layer 420, and the second pole 232 of the sensing transistor M0 is electrically connected to the driving signal line 110 through a via penetrating through the third insulating layer 430. The first pole 331 of the first switching transistor M1 is electrically connected to the second control signal line 140 through a via hole penetrating the third insulating layer 430 and the second insulating layer 420, and the second pole 332 of the first switching transistor M1 is electrically connected to the third control signal line 150 through a via hole penetrating the third insulating layer 430. Further, a planarization layer may be further disposed on the side of the layer of the first pole 231 of the detection transistor M0, which is away from the substrate 100.
In a specific implementation, the display panel may be a liquid crystal display panel. Such a pixel cell may include a pixel electrode and a thin film transistor. The grid electrode of the thin film transistor is electrically connected with the grid line, the source electrode of the thin film transistor is electrically connected with the data line, and the drain electrode of the thin film transistor is electrically connected with the pixel electrode. When the thin film transistor is turned on, a data signal transmitted on the data signal line charges the pixel electrode. Alternatively, the display panel may be an electroluminescent display panel, and thus the pixel unit may include an electroluminescent diode and a pixel circuit for driving the electroluminescent diode to emit light. The pixel circuit is electrically connected with the grid line and the data line respectively, and when the transistor in the pixel circuit is controlled by the grid line to be conducted, a data signal transmitted on the data line can be input to the grid electrode of the driving transistor in the pixel circuit. Further, the electroluminescent diode may include: an Organic Light-Emitting Diode (OLED) or a Quantum Dot Light-Emitting Diode (QLED), which is not limited herein. Further, the electroluminescent display panel may be a flexible electroluminescent display panel or a rigid electroluminescent display panel, which is not limited herein. Further, the driving signal line 110 and one electrode of the storage capacitor in the pixel circuit may be provided in the same material in the same layer.
In a specific implementation, the active layers of the first switching transistor, the detection transistor and the transistors in the pixel unit may be made of the same material. The grid electrodes of the grid line, the first switch transistor, the detection transistor and the transistor in the pixel unit can be made of the same material. And the source and drain electrodes of the data line, the first switch transistor, the detection transistor and the transistor in the pixel unit are arranged in the same layer and material, so that the process preparation difficulty is reduced.
The following describes the detection process by taking the display panel shown in fig. 3 as an example, but the reader should understand that the specific process is not limited thereto.
In the lighting detection stage, the detection terminals 121 have not been cut out of the display panel, and therefore, a plurality of detection terminals 121 (not shown in fig. 3, see fig. 1) are provided on the base substrate 100. Each detection signal line 120 is connected to one detection terminal 121, the first control signal line 130 is connected to one detection terminal 121, and the second control signal line 140 is connected to one detection terminal 121. In this way, when the display panel is lighted and detected, the lighting jig is electrically connected to each detection terminal 121, so that the first control signal line 130 is applied with the first control signal of low level, and the first switching transistor M1 is controlled to be turned on. The second control signal line 140 is applied with the second control signal of low level to be transmitted to the gate of each sensing transistor M0 through the turned-on second switching transistor M1 to control each sensing transistor M0 to be turned on. And loading a corresponding lighting detection signal to each detection signal line 120, and controlling the display area AA of the display panel to light up to detect whether the display panel is defective. If no defect is found at the lighting inspection stage, the substrate base 100 is cut according to the cutting line CG in fig. 1 to remove the inspection terminal 121.
And then assembling the display panel with elements such as a drive IC, an FPC, a PCB and the like. After the assembly is completed, a reliability testing stage is performed to test the reliability of the display panel (e.g., testing the reliability at 85 deg.C and 85 deg.C). In the reliability testing stage, the driving signal lines 110 are loaded with corresponding driving signals through the circuit or the driving IC on the PCB to control the display panel to light up, so as to perform the reliability testing on the display panel. In addition, the circuit or the driver IC on the PCB loads the high-level third control signal to the third control signal line 150 to control the turn-off of each detection transistor M0, so that the signal on the driving signal line 110 is prevented from being transmitted to the detection signal line 120 due to the leakage of the transistor, and therefore, no electrical signal is present on the detection signal line 120, and further, the corrosion phenomenon of the detection signal line 120 is prevented from occurring relatively quickly, and the influence of the corrosion of the detection signal line 120 on the driving signal line 110 is further reduced.
Fig. 5 and fig. 6 are schematic structural diagrams of display panels according to still other embodiments of the present invention. Which is modified to the embodiment of the display panel shown in fig. 3. Only the differences between this embodiment and the embodiment shown in fig. 3 will be described below, and the same parts will not be described herein.
In order to further reduce the influence of corrosion on the driving signal lines, in an embodiment of the present invention, as shown in fig. 5, the display panel may further include: a second switching transistor M2, a fourth control signal line 160, and a fifth control signal line 170. The second pole of the first switching transistor M1 is electrically connected to the gate of each detection transistor M0 through the second switching transistor M2. The gates of the second switching transistor M2 are electrically connected to the second pole of the first switching transistor M1 and the fourth control signal line 160, respectively, the first pole of the second switching transistor M2 is electrically connected to the fifth control signal line 170, and the second pole of the second switching transistor M2 is electrically connected to the gates of the detection transistors M0, respectively.
In practical implementation, in the embodiment of the present invention, as shown in fig. 5, each of the detection transistors may be configured as a P-type transistor. Further, in order to save the wiring space, the fifth control signal line 170 may be electrically connected to the detection signal line for applying the low level signal VGL among the detection signal lines, so that the respective detection transistors may be controlled to be turned on by the low level signal VGL. Of course, it is also possible to provide each of the detection transistors as an N-type transistor. Further, in order to save the wiring space, the fifth control signal line may be electrically connected to the detection signal line for applying the low level signal VGH among the detection signal lines, so that the respective detection transistors may be controlled to be turned on by the low level signal VGH. This is determined by design according to the actual application environment, and is not limited herein.
In specific implementation, as shown in fig. 6, in the embodiment of the present invention, the fourth control signal line 160 and each driving signal line 110 may have the same material in the same layer, so as to simplify the manufacturing process, save the manufacturing cost, and improve the manufacturing efficiency.
In specific implementation, as shown in fig. 6, in the embodiment of the invention, the active layer 510 of the second switch transistor M2 and the active layer 210 of the detection transistor M0 may be made of the same material in the same layer, so as to simplify the manufacturing process, save the manufacturing cost, and improve the manufacturing efficiency.
In specific implementation, as shown in fig. 6, in the embodiment of the present invention, the gate 520 of the second switch transistor M2 and the gate 220 of the detection transistor M0 may have the same material in the same layer, so as to simplify the manufacturing process, save the manufacturing cost, and improve the manufacturing efficiency.
In specific implementation, as shown in fig. 6, in the embodiment of the present invention, the fifth control signal line, the first electrode 531 and the second electrode 532 of the second switching transistor M2 and the first electrode 231 of the detecting transistor M0 may be made of the same material in the same layer, so as to simplify the manufacturing process, save the manufacturing cost, and improve the manufacturing efficiency.
The following describes the detection process by taking the preparation of the display panel shown in fig. 5 as an example, but the reader should understand that the specific process is not limited thereto.
In the lighting detection stage, the lighting fixture is electrically connected to each detection terminal 121, and a corresponding lighting detection signal is applied to each detection signal line 120. And loads the first control signal line 130 with the first control signal of low level, and controls the first switching transistor M1 to be turned on. The second control signal line 140 is applied with the second control signal of low level to be transmitted to the gate of the second switching transistor M2 through the turned-on second switching transistor M1, and the second switching transistor M2 is controlled to be turned on. Since the second switching transistor M2 is turned on, the low level signal VGL transmitted on the sensing signal line 120 may be supplied to the gate of each sensing transistor M0 through the fifth control signal line 170 to control each sensing transistor M0 to be turned on. Thereby controlling the display area AA of the display panel to light up to detect whether the display panel is defective. If no defect is found at the lighting inspection stage, the substrate base 100 is cut according to the cutting line CG in fig. 1 to remove the inspection terminal 121.
And then testing the reliability of the display panel. In the reliability testing stage, the driving signal lines 110 are loaded with corresponding driving signals through the circuit or the driving IC on the PCB to control the display panel to light up, so as to perform the reliability testing on the display panel. Furthermore, the circuit on the PCB or the driving IC applies a high level third control signal to the third control signal line 150 to control each of the detecting transistors M0 to turn off, so that the signal on the driving signal line 110 can be prevented from being transmitted to the detecting signal line 120 due to the leakage of the transistor. And the circuit or the driving IC on the PCB further loads the fourth control signal line 160 with the fourth control signal of high level to control the second switching transistor M2 to turn off, the signal on the third control signal line 150 can be prevented from being transmitted to the detection signal line 120 due to the leakage of the second switching transistor M2. Therefore, no electrical signal is generated on the detection signal line 120, thereby preventing the detection signal line 120 from being corroded quickly, and further reducing the influence of corrosion of the detection signal line 120 on the driving signal line 110.
Embodiments of the present invention further provide some methods for manufacturing the display panel, which may include: patterns of driving signal lines, detection signal lines, first control signal lines, second control signal lines, third control signal lines, first switching transistors, and detection transistors are formed on the substrate.
Specifically, the following description will be made by taking the example of preparing the display panel shown in fig. 4, but the reader should understand that the specific process is not limited thereto. As shown in fig. 4, the method for manufacturing the display panel may include the following steps:
(1) a pattern of an active layer is formed on the base substrate 100 through a patterning process. The active layer may include the active layer 210 of each detection transistor M0, the active layer 310 of the first switching transistor M1, and the active layer of the transistors in the pixel unit.
(2) Through a patterning process, a pattern of a first insulating layer 410 is formed on the base substrate 100 where the active layer is formed.
(3) Through a patterning process, patterns of the gate electrode 220 of each sensing transistor M0, the gate electrode 320 of the first switching transistor M1, each sensing signal line 120, the first control signal line 130, and the second control signal line 140 are formed on the substrate 100 on which the first insulating layer 410 is formed.
(4) Through the patterning process, a pattern of the second insulating layer 420 is formed on the base substrate 100.
(5) Through a patterning process, patterns of the driving signal lines 110 and the third control signal lines 150 are formed on the substrate 100.
(6) Through the patterning process, a pattern of the third insulating layer 430, a plurality of vias penetrating the third insulating layer 430 to the first insulating layer 410, a plurality of vias penetrating the third insulating layer 430 and the second insulating layer 420, and a plurality of vias penetrating the third insulating layer 430 are formed on the substrate base 100.
(7) Through the patterning process, the first and second poles 231 and 232 of each of the sensing transistors M0, the first and second poles 331 and 332 of the first switching transistor M1 are patterned on the base substrate 100. The first pole 231 of the sensing transistor M0 is electrically connected to the sensing signal line 120 through a via penetrating through the third insulating layer 430 and the second insulating layer 420, the second pole 232 of the sensing transistor M0 is electrically connected to the driving signal line 110 through a via penetrating through the third insulating layer 430, and the first pole 231 and the second pole 232 of the sensing transistor M0 are electrically connected to the active layer 210 through vias penetrating through the third insulating layer 430 to the first insulating layer 410, respectively. The first pole 331 of the first switching transistor M1 is electrically connected to the second control signal line 140 through a via hole penetrating the third insulating layer 430 and the second insulating layer 420, the second pole 332 of the first switching transistor M1 is electrically connected to the third control signal line 150 through a via hole penetrating the third insulating layer 430, and the first pole 331 and the second pole 332 of the first switching transistor M1 are electrically connected to the active layer 310 through a via hole penetrating the third insulating layer 430 to the first insulating layer 410, respectively.
(8) Through the patterning process, a planarization layer is formed on the substrate base plate 100.
The following description will be given by taking the example of manufacturing the display panel shown in fig. 6, but the reader should understand that the specific process is not limited thereto. As shown in fig. 6, the method for manufacturing the display panel may include the following steps:
(1) a pattern of an active layer is formed on the base substrate 100 through a patterning process. The active layers may include the active layer 210 of each sensing transistor M0, the active layer 310 of the first switching transistor M1, the active layer 510 of the second switching transistor M2, and the active layer of the transistors in the pixel cell, among others.
(2) Through a patterning process, a pattern of a first insulating layer 410 is formed on the base substrate 100 where the active layer is formed.
(3) Through a patterning process, patterns of the gate 220 of each sensing transistor M0, the gate 320 of the first switching transistor M1, the gate 520 of the second switching transistor M2, each sensing signal line 120, the first control signal line 130, and the second control signal line 140 are formed on the substrate 100 on which the first insulating layer 410 is formed.
(4) Through the patterning process, a pattern of the second insulating layer 420 is formed on the base substrate 100.
(5) Through the patterning process, patterns of the driving signal lines 110, the third control signal lines 150, and the fourth control signal lines 160 are formed on the base substrate 100.
(6) Through the patterning process, a pattern of the third insulating layer 430, a plurality of vias penetrating the third insulating layer 430 to the first insulating layer 410, a plurality of vias penetrating the third insulating layer 430 and the second insulating layer 420, and a plurality of vias penetrating the third insulating layer 430 are formed on the substrate base 100.
(7) Through the patterning process, a pattern of the first and second poles 231 and 232 of each of the sensing transistors M0, the first and second poles 331 and 332 of the first switching transistor M1, the first and second poles 531 and 532 of the second switching transistor M2, and the fifth control signal line is formed on the substrate 100. The first pole 231 and the second pole 232 of the sensing transistor M0 are electrically connected to the active layer 210 through a via penetrating through the third insulating layer 430 to the first insulating layer 410, the first pole 231 of the sensing transistor M0 is electrically connected to the sensing signal line 120 through a via penetrating through the third insulating layer 430 and the second insulating layer 420, and the second pole 232 of the sensing transistor M0 is electrically connected to the driving signal line 110 through a via penetrating through the third insulating layer 430. The first and second poles 331 and 332 of the first switching transistor M1 are electrically connected to the active layer 310 through vias penetrating the third insulating layer 430 to the first insulating layer 410, respectively, the first pole 331 of the first switching transistor M1 is electrically connected to the second control signal line 140 through vias penetrating the third insulating layer 430 and the second insulating layer 420, and the second pole 332 of the first switching transistor M1 is electrically connected to the fourth control signal line 160 through vias penetrating the third insulating layer 430. The first and second poles 531 and 532 of the second switching transistor M2 are electrically connected to the active layer 510 through vias penetrating through the third insulating layer 430 to the first insulating layer 410, respectively, the first pole 531 of the second switching transistor M2 is electrically connected to the corresponding sensing signal line 120 through a via penetrating through the third insulating layer 430 and the second insulating layer 420, and the second pole 532 of the second switching transistor M2 is electrically connected to the third control signal line 150 through a via penetrating through the third insulating layer 430.
(8) Through the patterning process, a planarization layer is formed on the substrate base plate 100.
It should be noted that the patterning process may only include a photolithography process, or may include a photolithography process and an etching step, and may also include other processes for forming a predetermined pattern, such as printing, inkjet printing, etc.; the photolithography process is a process of forming a pattern by using a photoresist, a mask plate, an exposure machine, and the like, including processes of film formation, exposure, development, and the like. In particular implementations, the corresponding patterning process may be selected based on the structure formed in the present invention.
Based on the same inventive concept, an embodiment of the present invention further provides a method for detecting the display panel, which may include:
in the lighting detection stage, loading a first control signal of a first level to the first control signal line, loading a second control signal of the first level to the second control signal line, and loading a corresponding lighting detection signal to each detection signal line to control the conduction of the first switching transistor, control the conduction of each detection transistor and control the lighting of the display panel;
in the reliability detection stage, the third control signal of the second level is applied to the third control signal line, and the corresponding driving signal is applied to each driving signal line to control each detection transistor to be turned off and control the display panel to be turned on.
In a specific implementation manner, in the embodiment of the present invention, in the lighting detection stage, the detection method further includes: loading a fifth control signal of a first level to a fifth control signal line;
in the reliability detection stage, the detection method further comprises: and loading a fourth control signal of the second level to the fourth control signal line.
In a specific implementation, when the fifth control signal line is electrically connected to the detection signal line for loading the low-level signal in the detection signal line, the fifth control signal line may be loaded with the fifth control signal of the first level by the low-level signal in the detection signal line.
In a specific implementation, when the fifth control signal line is electrically connected to the detection signal line for applying the high-level signal, the fifth control signal line may be applied with the fifth control signal of the first level by the high-level signal in the detection signal line.
The detection principle and the specific implementation of the detection method of the display panel are the same as those of the embodiment of the display panel, and therefore, the detection method of the display panel can be implemented by referring to the specific implementation of the display panel in the embodiment, and is not described herein again.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises the display panel and the driving circuit provided by the embodiment of the invention; the driving circuit is electrically connected with each driving signal line and the third control signal line respectively. The principle of the display device to solve the problem is similar to the display panel, so the implementation of the display device can be referred to the implementation of the display panel, and repeated details are not repeated herein.
In practical implementation, when the display panel further includes a fourth control signal line, in the embodiment of the present invention, the driving circuit is further electrically connected to the fourth control signal line.
In particular implementations, the driver circuit may include a circuit on a PCB or a driver IC.
In specific implementation, the display device provided in the embodiment of the present invention may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
According to the display panel, the preparation method, the detection method and the display device provided by the embodiment of the invention, the detection transistor is arranged between the detection signal line and the corresponding driving signal line, and the first switch transistor is arranged to control all the detection transistors to be conducted in the lighting detection stage, so that the lighting detection signal is provided for the display area to light the display panel. In the reliability detection stage, all the detection transistors are controlled to be turned off by signals loaded by the third control signal line, so that the detection signal line and the driving signal line are isolated and disconnected by the detection transistors, the influence on the transmission of signals in the driving signal line due to the extension of the corrosion position of the detection signal line can be avoided, and the display abnormity is further avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A display panel, comprising: the display panel comprises a substrate base plate, a plurality of driving signal lines and detection signal lines, wherein the driving signal lines are positioned on the substrate base plate and used for inputting driving signals to a display area of the display panel, and the detection signal lines are electrically connected with the driving signal lines in a one-to-one correspondence mode, and the display panel is characterized by further comprising: a drive terminal, a first switching transistor, a first control signal line, a second control signal line, a third control signal line, and a detection transistor in one-to-one correspondence with each of the detection signal lines, the drive terminal, the first switching transistor, the first control signal line, the second control signal line, the third control signal line, and the detection transistor being electrically connected in one-to-one correspondence with the drive signal lines; each detection signal line is electrically connected with the corresponding driving signal line through the corresponding detection transistor; the driving signal lines extend from the electrically connected driving terminals directly into the display region;
the grid electrode of the first switch transistor is electrically connected with the first control signal line, the first pole of the first switch transistor is electrically connected with the second control signal line, and the second pole of the first switch transistor is respectively and electrically connected with the third control signal line and the grid electrodes of all the detection transistors;
the display panel further includes: a second switching transistor, a fourth control signal line, and a fifth control signal line; a second pole of the first switching transistor is electrically connected with a gate of each of the detection transistors through the second switching transistor;
the gate of the second switching transistor is electrically connected to the second pole of the first switching transistor and the fourth control signal line, the first pole of the second switching transistor is electrically connected to the fifth control signal line, and the second pole of the second switching transistor is electrically connected to the gate of each of the detection transistors.
2. The display panel according to claim 1, wherein each of the detection transistors is a P-type transistor, and the fifth control signal line is electrically connected to a detection signal line for applying a low-level signal among the detection signal lines; alternatively, the first and second electrodes may be,
each detection transistor is an N-type transistor, and the fifth control signal line is electrically connected with a detection signal line for loading a high-level signal in the detection signal line.
3. The display panel of claim 1, wherein the fourth control signal line and each of the driving signal lines are of the same material in the same layer.
4. The display panel according to any one of claims 1 to 3, wherein the driving signal line and the detection signal line are provided in different layers.
5. The display panel according to claim 4, wherein the third control signal line and each of the driving signal lines are of the same material in the same layer; and/or the presence of a gas in the gas,
the first control signal line, the second control signal line, each detection signal line and the gates of all the transistors are made of the same material in the same layer.
6. The display panel according to any one of claims 1 to 3, wherein the second control signal line is a broken line shape; and/or the material of the active layer of all the transistors is polysilicon.
7. A display device comprising the display panel according to any one of claims 1 to 6 and a driver circuit; wherein the driving circuit is electrically connected to each of the driving signal lines and the third control signal line, respectively;
the driving circuit is also electrically connected with a fourth control signal line.
8. A method for manufacturing a display panel according to any one of claims 1 to 6, comprising:
forming a pattern of each of the driving signal lines, each of the detection signal lines, the first control signal line, the second control signal line, the third control signal line, the first switching transistor, and each of the detection transistors on the substrate;
and forming patterns of the second switching transistor, the fourth control signal line and the fifth control signal line on the substrate base plate respectively.
9. The method for inspecting a display panel according to any one of claims 1 to 6, comprising:
in a lighting detection stage, loading a first control signal of a first level to the first control signal line, loading a second control signal of the first level to the second control signal line, and loading a corresponding lighting detection signal to each detection signal line to control the conduction of the first switch transistor, control the conduction of each detection transistor, and control the lighting of the display panel;
in the reliability detection stage, a third control signal with a second level is loaded on the third control signal line, and a corresponding driving signal is loaded on each driving signal line so as to control each detection transistor to be turned off and control the display panel to be turned on;
in the lighting detection phase, the detection method further includes: loading a fifth control signal of a first level to the fifth control signal line;
in the reliability detection phase, the detection method further includes: and loading a fourth control signal of a second level to the fourth control signal line.
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| CN111261055B (en) * | 2020-01-21 | 2022-02-22 | 京东方科技集团股份有限公司 | OLED display screen and OLED display device |
| CN111583842A (en) * | 2020-05-29 | 2020-08-25 | 京东方科技集团股份有限公司 | Display panel, display device and disconnection detection method thereof |
| CN113448131A (en) * | 2021-06-23 | 2021-09-28 | 惠科股份有限公司 | Display panel and test method thereof |
| CN113539131A (en) * | 2021-07-20 | 2021-10-22 | 京东方科技集团股份有限公司 | Display panel and manufacturing method thereof, display mother board and detection method thereof, and display device |
| CN113643636B (en) * | 2021-10-14 | 2022-01-07 | 惠科股份有限公司 | Test circuit of display panel and display device |
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