WO2020140783A1 - 测试基板及其制作方法、测试方法、显示基板 - Google Patents
测试基板及其制作方法、测试方法、显示基板 Download PDFInfo
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- WO2020140783A1 WO2020140783A1 PCT/CN2019/127421 CN2019127421W WO2020140783A1 WO 2020140783 A1 WO2020140783 A1 WO 2020140783A1 CN 2019127421 W CN2019127421 W CN 2019127421W WO 2020140783 A1 WO2020140783 A1 WO 2020140783A1
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- 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
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78651—Silicon transistors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- 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
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- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- H—ELECTRICITY
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- H—ELECTRICITY
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- 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
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- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
Definitions
- the test substrate further includes: at least one test hole and at least one test pin located in the test area, the bottom of each test hole in the at least one test hole exposes the source region of the target thin film transistor , A drain region or a gate; each of the at least one test pin is located in one of the at least one test hole, and one end of the test pin passes through the test hole It is coupled to the source region, the drain region or the gate of the target thin film transistor, and the other end is exposed to the surface of the test substrate.
- the test substrate further includes: an interlayer insulating layer, a data lead layer, and a plurality of vias.
- An interlayer insulating layer is disposed on a side of the plurality of thin film transistors away from the base substrate; a data lead layer is disposed on a side of the interlayer insulating layer away from the base substrate, and the data lead layer includes exposed Multiple data leads on the surface of the test substrate; multiple vias at least penetrate the interlayer insulating layer.
- At least one test hole is formed in the test area, and the bottom of each test hole in the at least one test hole exposes the source region, the drain region, or the gate of the target thin film transistor.
- a test pin is formed in the test hole, and the test pin is coupled to the source region, the drain region, or the gate exposed by the test hole where the test pin is located.
- the first display substrate further includes a data wiring layer disposed on a side of the plurality of thin film transistors away from the base substrate, the data wiring layer includes exposure to the first display
- the test region forms at least One test hole, including: forming two test holes in the test area; the two test holes respectively expose the source region, the drain region, and the gate of the target thin film transistor that are not connected to the data lead The two are directly coupled.
- the first display substrate further includes a data wiring layer disposed on a side of the plurality of thin film transistors away from the base substrate, the data wiring layer includes exposure to the first display
- the data wiring layer includes exposure to the first display
- the test pin is formed in the test hole, and the test pin is coupled to one of the source region, the drain region, or the gate exposed by the test hole,
- the method includes: using a focused ion beam deposition process to deposit metal in the test hole to form the test pin.
- the manufacturing method further includes: after forming the test pin in the test hole, removing residual metal deposited around the test hole.
- the orthographic projection of the test pin on the base substrate of the first display substrate is located in the source region, drain region, or gate of the target thin film transistor to which the test pin is coupled Within the orthographic projection range on the base substrate.
- a test method for a test substrate is provided.
- the test substrate is the test substrate as described above.
- the test method includes: applying voltages to the source region, the drain region, and the gate of each of the at least one target thin film transistor of the test substrate; wherein, the source region, the The voltage is applied to at least one of the drain region and the gate by a test pin coupled to at least one of the source region, the drain region, and the gate At least one of the source region, the drain region, and the gate applies a voltage.
- Each electrical characteristic parameter in the at least one electrical characteristic parameter is compared with a typical value matching the electrical characteristic parameter to obtain an abnormal electrical characteristic parameter.
- FIG. 1 is a structural diagram of a pixel driving circuit according to some embodiments
- 8A is another structural diagram of a test area in a test substrate according to some embodiments.
- FIG. 10 is another flow chart of a method for manufacturing a test substrate according to some embodiments.
- Coupled and “connected” and their derivatives may be used.
- some embodiments may be described using the term “connected” to indicate that two or more components are in direct physical or electrical contact with each other.
- the term “coupled” may be used when describing some embodiments to indicate that two or more components have direct physical or electrical contact.
- the term “coupled” or “communicatively coupled” may also mean that two or more components do not directly contact each other, but still cooperate or interact with each other.
- the embodiments disclosed herein are not necessarily limited to the content herein.
- Coupled and “connected” and their derivatives may be used.
- some embodiments may be described using the term “connected” to indicate that two or more components are in direct physical or electrical contact with each other.
- the term “coupled” may be used when describing some embodiments to indicate that two or more components have direct physical or electrical contact.
- the embodiments disclosed herein are not necessarily limited to the content herein.
- At least one of A, B, and C has the same meaning as “at least one of A, B, or C” and includes the following combinations of A, B, and C: A only, B only, C only, A, and B Combination, A and C combination, B and C combination, and A, B and C combination.
- TFT-LCD Thin Film Transistor Liquid Crystal
- OLED Organic Light Emitting Diode
- a plurality of circuit structures on the display substrate of the TFT-LCD include a pixel driving circuit corresponding to each sub-pixel, and each pixel driving circuit is usually provided with a thin film transistor coupled to the pixel electrode, which is configured to scan on the gate Turn on under the control of the signal to apply the driving signal to the pixel electrode, and turn off under the control of the gate scanning signal to stop applying the driving signal to the pixel electrode.
- the multiple circuit structures on the OLED display substrate generally include a pixel drive circuit corresponding to each sub-pixel.
- Each pixel drive circuit is located in the display area of the TFT backplane.
- Each pixel drive circuit is provided with a plurality of thin film transistors and at least one light emitting device.
- the architecture of the pixel driving circuit is 2T1C (two thin film transistors and one capacitor), or, as shown in FIG. 1, the architecture of the pixel driving circuit is 7T1C, and the pixel driving circuit with the architecture of 7T1C includes seven thin film transistors, A capacitor and a light-emitting diode.
- the above-mentioned multiple circuit structures on the TFT-LCD display substrate, or the multiple circuit structures on the OLED display substrate also include a gate driving circuit including a plurality of thin film transistors, configured to achieve shift The register function provides signals for all gate lines row by row within a frame to drive each gate line.
- a GOA (Gate Driver Array) design is used, and a gate drive circuit composed of a plurality of thin film transistors is integrated in a non-display area of a TFT-LCD display substrate and an OLED display substrate, examples sexually, the non-display area is located on one, two or more sides of the display area.
- the pixel driving circuit and the gate driving circuit both include a plurality of thin film transistors, and the electrical characteristics of the thin film transistor, such as the electrical characteristics of the driving thin film transistor with a load function, will directly affect the pixel containing the thin film transistor
- the electrical performance of the driving circuit or the gate driving circuit has an influence, which in turn affects the display effect of the display device.
- some embodiments of the present disclosure provide a method for manufacturing a test substrate.
- the test substrate obtained by the manufacturing method can directly test the thin-film transistors having problems in the circuit structure during the electrical test of the circuit structure, so that the thin-film transistors obtained according to the test can be subsequently displayed on the substrate according to the electrical characteristics of the test
- guide and improve the manufacturing process of the thin film transistor on the display substrate to achieve the purpose of improving product yield.
- the test substrate is prepared on the basis of the first display substrate 01 shown in FIG. 2.
- the first display substrate 01 on which the manufacturing method is based is first to introduce, exemplarily, the pixel driving circuit included in the first display substrate 01 takes the pixel driving circuit of the 7T1C architecture shown in FIG. 1 as an example.
- each thin film transistor includes a gate Pole, source and drain.
- each thin film transistor includes a gate and a silicon island, the silicon island includes a source region, a drain region, and an active region between the two, wherein the source The pole region can be regarded as the source and the drain region can be regarded as the drain.
- the first display substrate 01 includes: a base substrate 1, a data lead layer 2 and a multilayer thin film layer between the base substrate 1 and the data lead layer 2.
- a multi-layer thin film layer is provided on the first side of the base substrate 1, the multi-layer thin film layer forms a plurality of thin film transistors; each of the plurality of thin film transistors includes a silicon island 61 and a gate 71, the silicon island 61 includes a source region 61a, a drain region 61b, and an active region 61c located therebetween.
- the three thin film transistors shown in FIG. 2 correspond to the thin film transistor T1, the thin film transistor T3, and the thin film transistor T4 in the pixel driving circuit shown in FIG. 1, respectively.
- the structure of the plurality of thin film transistors may be a bottom gate type or a top gate type, which is not limited in the present disclosure.
- the top gate type thin film transistor is taken as an example to introduce the multilayer thin film layer.
- the multilayer thin film layer includes a semiconductor layer 6, a first insulating layer 3, a first metal layer 7, and an interlayer insulating layer 5 that are sequentially stacked on the first side of the base substrate 1.
- the semiconductor layer 6 includes a plurality of silicon islands 61, and each of the plurality of silicon islands 61 includes a source region 61a, a drain region 61b, and an active region 61c located therebetween.
- the first insulating layer 3 is provided on the side of the semiconductor layer 6 away from the base substrate 1.
- the first metal layer 7 includes a plurality of gates 71, and the position of each gate 71 in the plurality of gates 71 corresponds to the position of each silicon island 61.
- the interlayer insulating layer 5 is provided on the side of the gate 71 layer away from the base substrate 1.
- the data lead layer 2 is disposed on the side of the interlayer insulating layer 5 away from the base substrate 1.
- the data lead layer 2 is the surface layer of the first display substrate 01, and the data lead layer 2 includes multiple data leads DL, the plurality of data leads DL are exposed on the surface of the first display substrate 01.
- the plurality of data leads DL includes a plurality of signal lines provided on the data lead layer 2, and each of the plurality of signal lines is configured to transmit signals.
- the first display substrate 01 includes a plurality of signals such as a gate line, an initialization signal line, a reset signal line, an enable signal line, a data line, a first voltage signal line and a second voltage signal line, etc.
- the gate line is configured to transmit the gate 71 scan signal Gate
- the initialization signal line is configured to transmit the initial signal Vinit
- the reset signal line is configured to transmit the reset signal Reset
- the enable signal line is configured to transmit the enable signal EM
- the data line is configured to transmit the data signal data
- the first voltage signal line is configured to transmit the first power supply voltage Vdd
- the second voltage signal line is configured to transmit the second power supply voltage Vss.
- the plurality of data leads DL includes the data leads
- the plurality of data leads DL include the data line and the first voltage signal line.
- the data line and the first voltage signal line are provided in the data wiring layer 2 for description.
- each pixel driving circuit includes a capacitor
- the first display substrate 01 further includes a plurality of capacitance.
- the first metal layer 7 also includes a plurality of first electrodes 72 as lower plates of the capacitor.
- the first display substrate 01 further includes a second insulating layer 4 disposed on the side of the first metal layer 7 away from the base substrate 1 and a second electrode layer disposed on the side of the second insulating layer 4 away from the base substrate 1 8.
- the second electrode layer 8 includes a plurality of second electrodes 81 corresponding to the plurality of first electrodes 72 in one-to-one correspondence, as upper plates of the capacitor.
- the upper electrode of the capacitor is coupled to the gate 71 of the thin film transistor T3, and the lower electrode of the capacitor is coupled to the second voltage signal line.
- the first display substrate 01 further includes a plurality of vias a, and each via a of the plurality of vias a penetrates at least the interlayer insulating layer 5.
- the drain region 61 b of the thin film transistor T4 is provided with a via a penetrating the first insulating layer 3, the second insulating layer 4 and the interlayer insulating layer 5, and the drain of the thin film transistor T4
- the region 61b is directly coupled to the data lead DL (the data lead DL is a data line) through the via a (in this application, the drain region, the source region, or the gate of the thin film transistor are passed through the via a and the data lead (Coupling is called direct coupling);
- the gate 71 area of the thin film transistor T3 is provided with a through hole a penetrating the second insulating layer 4 and the interlayer insulating layer 5, and the drain area 61b of the thin film transistor T1 is provided with a penetration Vias a
- the source (or drain) of one thin film transistor may be coupled to the source (or drain) of another thin film transistor, for example, the source of the thin film transistor T3 is coupled to the drain of the thin film transistor T4
- the silicon island 61 of the thin film transistor T3 and the silicon island 61 of the thin film transistor T4 are both in the semiconductor layer 6, the drain region 61b of the thin film transistor T3 and the thin film transistor T4
- the source region 61a is an integrated structure and does not need to be coupled through the via a.
- a method for manufacturing a test substrate includes:
- the provided first display substrate 01 is a display substrate prepared from the base substrate 1 to the data wiring layer 2, and this step can be understood as directly taking the already prepared first display substrate 01, or can also be understood as The first display substrate 01 is prepared.
- the preparation method of the first display substrate 01 will be described later. 2
- the first display substrate 01 includes a base substrate 1 and a plurality of thin film transistors provided on the first side of the base substrate 1, such as a thin film transistor T1, a thin film transistor T3, and a thin film transistor T4.
- the thin film transistor T1 the thin film transistor T3, and the thin film transistor T4 are target thin film transistors Tg
- three test areas 100 are divided in the pixel area, and the three target thin film transistors Tg are located in the three test areas 100, respectively in.
- test holes b are formed in the test region 100, wherein the bottom of one test hole b exposes the source region 61a of the thin film transistor T3 and the other The bottom of the test hole b exposes the drain region 61b of the thin film transistor T3.
- test pin 9 is formed in the test hole b.
- the test pin 9 is coupled to the source region 61a, the drain region 61b, or the gate 71 exposed by the test hole b.
- test pin 9 is in contact with the source region 61a, the drain region 61b or the gate 71 exposed by the test hole b where it is located, so that the test pin 9 can be in contact with the source region 61a and the drain of the target thin film transistor Tg
- the pole region 61b or the gate 71 region is coupled.
- test pins 9 are formed in the two test holes b corresponding to the thin film transistor T3, one test pin 9 is coupled to the source region 61a exposed by the test hole b, and the other test pin 9 The drain region 61b exposed by the test hole b is coupled.
- the thin film transistor with a problem in the circuit structure can be directly used as the target thin film transistor Tg to be tested, and then passed through the test tube Pin 9 transmits the voltage to the source region 61a, the drain region 61b or the gate 71 to which the test pin 9 is coupled, and then tests the electrical characteristics of the target thin film transistor Tg, so that whether it is located in the display region
- the pixel drive circuit, or the gate drive circuit in the non-display area can test the thin film transistors included in it, so that according to the electrical characteristics of the thin film transistors obtained by the test, in the subsequent production process of the display substrate, guide and The manufacturing process of the thin film transistor on the display substrate is improved to achieve the purpose of improving product yield.
- test hole b including:
- test holes b are formed in the test region 100; the source regions 61a, the drain regions 61b, and the gate 71 of the target thin film transistor Tg exposed by the two test holes b are not connected to the data leads DL directly couples the two.
- the via a is represented by a circular hole
- the test hole b is represented by a square hole, as is also the case in FIGS. 5B and 5C
- the gate 71 of the thin-film transistor T3 is directly coupled to the data lead DL through the via a, and the probe of the test equipment can be lapped on the data lead DL, That is, it is possible to provide a test voltage to its gate electrode 71, so that there is no need to form a test hole b at a position corresponding to the gate electrode 71.
- the source region 61a and the drain region 61b of the thin film transistor T3 are not directly coupled to the data lead DL, and a plurality of inorganic layers are covered above the source region 61a and the drain region 61b, for example, the first insulating layer 3, the first The second insulating layer 4 and the interlayer insulating layer 5, the probe of the test equipment cannot directly contact the source region 61a and the drain region 61b.
- two test holes b are formed at positions corresponding to the source region 61a and the drain region 61b of the thin film transistor T3, and the two test holes b penetrate the first insulating layer 3, the second insulating layer 4, and the interlayer insulating layer 5.
- the source region 61a and the drain region 61b of the thin film transistor T3 are exposed, respectively.
- the two test pins 9 formed in the two test holes b are respectively coupled to the source region 61a and the drain region 61b of the thin film transistor T3.
- test hole b including:
- a test hole b is formed in the test region 100; the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg exposed by the one test hole b are not directly coupled to the data lead DL Pick one.
- a test hole b is formed at a position corresponding to the source region 61a of the target thin film transistor Tg, and the bottom of the test hole b is exposed
- the source region 61a of the target thin film transistor Tg, and the test pin 9 formed in the test hole b are coupled to the source region 61a of the target thin film transistor Tg.
- test region 100 is described in S103 At least one test hole b is formed, including:
- test holes b are formed in the test region 100; the three test holes b expose the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg, respectively.
- the three test pins 9 formed in the three test holes b are respectively coupled to the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg.
- the source region 61a, the drain region, or the gate 71 of the target thin film transistor Tg located in the test region 100 can be placed through the test hole b After being exposed, a test pin 9 is formed in the test hole b.
- the test pin 9 may be coupled to the source region, the drain region, or the gate 71 exposed at the bottom of the test hole b.
- the probe of the test device can directly provide a test voltage to at least one of the source, drain region, or gate 71 region of the target thin film transistor Tg by directly contacting the above test pin 9 The electrical characteristics of the target thin film transistor Tg are tested.
- the above test equipment can directly test the electrical characteristics thereof, thereby accurately obtaining the electrical characteristics of the target thin film transistor Tg, without
- the electrical performance of the thin-film transistor with defects is characterized by the electrical performance of the test unit located in the periphery of the display area, so as to improve the accuracy of the electrical test.
- the electrical characteristics of the target thin film transistor Tg obtained in the test in the subsequent production process of the display substrate, guide and improve the manufacturing process of the corresponding thin film transistor on the display substrate, so that the electrical characteristics of the thin film transistor are improved to achieve The purpose of improving product yield.
- the preparation method of the test substrate further includes: after forming the test pin 9 in the test hole b, connecting the test pin 9 to the plurality of data leads A data lead DL in the DL is coupled.
- the one data lead DL is adjacent to the test pin 9 and is not adjacent to any one of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg corresponding to the test pin 9 Those are directly coupled.
- the drain region 61b of the thin film transistor T4 passes through the via a and a data lead DL (
- the data lead DL is a data line) directly coupled, and two test holes b and two test pins 9 are formed at positions corresponding to the source region 61a and the gate 71 of the thin film transistor T4.
- the test pin 9 corresponding to the gate 71 is coupled to an adjacent data lead DL which cannot be the above-mentioned data lead DL coupled to the drain region 61b of the thin film transistor T4 through the via a .
- the test pin 9 corresponding to the source region 61a is coupled to an adjacent data lead DL, which cannot be the data lead DL coupled to the drain region 61b or the gate 71 of the thin film transistor T4. That is, in the same target thin film transistor Tg, the source region 61a, the drain region 61b, and the gate 71 are respectively coupled to different data leads DL, so as to avoid the source region 61a of the same target thin film transistor Tg The test voltages applied by the drain region 61b and the gate 71 interfere with each other, affecting the test effect.
- the above deposition process is continued to make the manufactured test
- the pin 9 is coupled to a data lead DL adjacent to the test pin 9 through the metal that continues to be deposited.
- the probe of the test equipment can be directly contacted with the data lead DL, that is, the data
- the test pin 9 to which the lead DL is coupled provides a test voltage, and then the test voltage is provided to the source region 61a, the drain region 61b, or the gate 71 to which the test pin 9 is coupled, so as to achieve the target thin film transistor Tg Electrical performance testing. Since the size of the data lead DL is larger than that of the test pin 9, the probe of the test equipment is more likely to contact the data lead DL, and the test operation is simple and easy.
- the first side of the base substrate 1 has a multilayer thin film layer
- the multilayer thin film layer forms the plurality of thin film transistors
- the multilayer thin film layer includes At least one conductive thin film layer, in some embodiments, each thin film layer of the at least one conductive thin film layer is cut around the test area 100 to make the test area 100 electrically conductive to other areas isolation.
- the other areas include: other test areas 100 in the at least one test area 100 except for the test area 100, and non-test areas 100 in the display substrate except for the at least one test area 100.
- the multi-layer thin film layer is a semiconductor layer 6, a first insulating layer 3, a first metal layer 7, and a second insulating layer 4 provided on the first side of the base substrate 1 in this order.
- Each thin film layer of the at least one conductive thin film layer is cut around the test area 100, and the test area 100 can be electrically isolated from other areas, so that the target thin film transistor Tg of the test area 100 During the electrical test, it is possible to avoid the coupling between the test area 100 and other areas through the conductive thin film layer, and the voltage output by the test equipment is not fully applied to the source area 61a, the drain area 61b of the target thin film transistor Tg, or The grid 71 affects the test effect.
- the two target thin film transistors Tg are adjacent to each other.
- the above test substrate manufacturing method further includes disconnecting the conductive thin film layers in the two adjacent test areas 100. For example, at the boundary between two adjacent test areas 100, the multilayer film layers stacked in sequence are cut off. In this way, during the electrical test, the conductive thin film layers of two adjacent test areas 100 are coupled, which may affect the test result.
- a focused ion beam (Focused Ion Beam, FIB) sputtering process may be used from top to bottom in a direction perpendicular to the film-forming surface of the base substrate 1 to convert the data lead layer 2 and layer 2 shown in FIG. 2 Thin film layers such as the interlayer insulating layer 5, the first electrode 72 layer, the second insulating layer, the first metal layer 7 and the first insulating layer are cut.
- FIB focused ion beam
- Focused ion beam (Focused Ion Beam, FIB) sputtering process at least one of the source region, the drain region, and the gate 71 corresponding to each target thin film transistor Tg according to at least one sputtering calculation model Sputtering is performed separately to form the at least one test hole b.
- FIB Focused ion Beam
- each sputtering calculation model of the at least one sputtering calculation model includes the shape and size of the opening of the test hole b to be formed, the depth of the test hole b to be formed, and the application to the ion beam Voltage and/or current, etc.
- the voltage or current applied to the ion beam described above can determine the sputtering rate of the ion beam.
- the relationship between the sputtering rate, the sputtering depth, and the opening size of the test hole b can be determined to achieve precise control of the opening size of the test hole b And depth of purpose.
- the size and shape of the opening of the test hole b in the two models should be the same. For example, all are rectangular as shown in FIG. 5C.
- the actual sputtering depth of the test hole b is refined judgment, so that within the allowable range of sputtering tolerance,
- the actual sputtering depth of the test hole b can be the same as the target sputtering depth H, thereby achieving the purpose of improving the sputtering accuracy of the test hole b.
- a test pin 9 is formed in the test hole b in S104, and the test pin 9 may use a deposition process, such as a focused ion beam deposition process. This step specifically includes: using a focused ion beam deposition process to deposit metal in the test hole b to form the test pin 9.
- the periphery of the test hole b will be covered with the metal in the sputtered substrate during the sputtering process
- the material generates the above-mentioned residual metal 300.
- the above test hole b or the test pin 9 may be covered with the same material as the formed test pin 9 ⁇ 300 ⁇ The residual metal 300.
- removing the residual metal 300 around the test hole b includes:
- an image of the target thin film transistor Tg (ion beam image and/or electron beam image) is made, and by observing the above ion beam image and/or electron beam image, it is judged Whether the residual metal 300 is completely removed.
- the orthographic projection of the test pin 9 on the base substrate 1 of the first display substrate 01 is located in the source region 61a and the drain region 61b of the target thin film transistor Tg to which the test pin 9 is coupled Or the grid 71 is within the orthographic projection range on the base substrate 1. That is, as shown in FIG. 7B, the test hole b exposes only the source region, drain region, or gate 71 region of the target thin film transistor Tg, but does not expose the source region 61a, drain region 61b, or gate Other thin film layers around the pole 71.
- the length of any side of the rectangle is less than or equal to the line width of the source region, the drain region, or the gate 71 of the target thin film transistor Tg.
- the shape of the opening of the test hole b is a circle, the diameter of the circle is less than or equal to the line width of the source region, the drain region 61b, or the gate 71 of the target thin film transistor Tg.
- the partial structure of the second display substrate is the same as that of the first display substrate 01.
- the second display substrate and the first display substrate 01 belong to the same production batch
- the second display substrate includes: the base substrate 1 , The data lead layer 2, and the multilayer thin film layer between the base substrate 1 and the data lead layer 2, the above structure is the same as the structure of the first display substrate 01, except that the second display substrate also includes: sequentially stacked Thin film layers such as a passivation layer, an anode layer, a light emitting layer and a cathode layer provided on the side of the data lead layer 2 facing away from the base substrate 1, the first display substrate 01 is a complete display substrate, which can support lighting Test to obtain the location of the defect (for example, the location of the bright spot).
- Providing the first display substrate 01 in S101 includes the steps of preparing the first display substrate 01.
- the following uses the first display substrate 01 shown in the figure as an example to exemplarily describe the preparation method of the first display substrate 01.
- the thin film transistor T3 and the capacitor C are used as examples.
- the semiconductor layer 6 is formed on the base substrate 1.
- the material of the semiconductor layer 6 includes LTPS (Low Temperature Poly-silicon).
- LTPS Low Temperature Poly-silicon
- the active region of each silicon island 61 is lightly doped with ions to make it into a lightly doped region.
- the source region 61a and the drain region 61b of each silicon island 61 are ion-doped heavily to make them ion-doped regions.
- a patterning process is performed on the second metal layer 8 to form a plurality of second electrodes 81, and each second electrode 81 serves as an upper electrode of the capacitor.
- the positions of the plurality of second electrodes 81 correspond to the positions of the plurality of first electrodes 72, and each second electrode 81 is orthographically projected on the base substrate 1, and the corresponding first electrode 72 is on the substrate At least a part of the orthographic projections on the substrate 1 overlap to constitute the above-mentioned capacitor.
- a plurality of vias a that penetrate at least the interlayer insulating layer 5 are formed.
- the thin film transistor shown in FIG. 12E is an example of the thin film transistor T3.
- a via a is formed at a position corresponding to the gate 71, and the via a penetrates the second insulating layer 4 and the interlayer Insulation layer 5.
- this step is to form a via a at a position corresponding to the drain region 61b, the via a penetrating the first insulating layer 3, the second insulating layer 4 and ⁇ 5
- the above test area 100 includes not only a target thin film transistor Tg, but also other thin film layers between the target thin film transistor Tg and the base substrate 1, such as a buffer layer, a light shielding layer, etc. (not shown in the figure), It also includes a portion of the multi-layer thin film layer located in the test area 100, the multi-layer thin film layer including: a first insulating layer, a second insulating layer, an interlayer insulating layer 5, and the like.
- test substrate 02 includes: a base substrate 1, a data lead layer 2 and a position between the base substrate 1 and the data lead layer 2 Multi-layer thin film layer.
- a multi-layer thin film layer is provided on the first side of the base substrate 1, the multi-layer thin film layer forms a plurality of thin film transistors; each of the plurality of thin film transistors includes a silicon island 61 and a gate 71, the silicon island 61 includes a source region 61a, a drain region 61b, and an active region 61c located therebetween.
- At least one thin film transistor of the plurality of thin film transistors is the target thin film transistor Tg to be tested.
- the thin film transistor T4 is taken as the target thin film transistor Tg.
- the test substrate 02 further includes: at least one test hole b and at least one test pin 9 located in the test area 100, the bottom of each test hole b in the at least one test hole b exposes the target The source region 61a, the drain region 61b, or the gate 71 of the thin film transistor Tg.
- Each test pin 9 of the at least one test pin 9 is located in one test hole b of the at least one test hole b, and one end of the test pin 9 passes through the test hole b and all The source region 61a, the drain region 61b, or the gate 71 of the target thin film transistor Tg are coupled, and the other end is exposed to the surface of the test substrate 02.
- the test substrate 02 provided by the present disclosure can directly use the thin-film transistor in the circuit structure as the target thin-film transistor Tg to be tested during the electrical test of the circuit structure, and then pass the test pin 9 to deliver the voltage To the source region 61a, the drain region 61b or the gate 71 to which the test pin 9 is coupled, and then test the electrical characteristics of the target thin film transistor Tg, so that whether it is a pixel driving circuit located in the display region or
- the gate 71 drive circuit located in the non-display area can test the thin film transistors included in it, so that according to the electrical characteristics of the thin film transistors obtained by the test, in the subsequent production process of the display substrate, it can guide and improve the The manufacturing process of the thin film transistor achieves the purpose of improving product yield.
- one of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg is directly coupled to the data lead DL through one of the plurality of vias a
- the source region 61a, the drain region 61b, and the gate 71 of Tg are not coupled to the data lead DL through the one via a.
- the probe of the test equipment may be connected to the The data lead DL transmits a voltage to the gate 71 to which it is coupled.
- the source region 61a and the drain region 61b are coupled to two test pins 9 provided in the two test holes b, and the probes of the test equipment overlap the two test pins 9 and are exposed to One end of the surface of the test substrate 02 transmits voltage to the source region 61a and the drain region 61b, respectively.
- two of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg are directly coupled to the data lead DL through two vias a of the plurality of vias a
- the source region 61a and the The test pin 9 in the test hole b is coupled, and the probe of the test device can be connected to the end of the test pin 9 exposed on the surface of the test substrate 02 to transmit the voltage to the source region 61a, respectively.
- the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg are not directly coupled to the data lead DL through the plurality of vias a
- the source region 61a, the drain region 61b, and the gate 71 of Tg are coupled.
- the test voltage can be provided to the source region 61a, the drain region 61b, and the gate 71 of the thin film transistor T5.
- the test pin 9 is coupled to one of the plurality of data leads DL.
- the one data lead DL is adjacent to the test pin 9, and the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg are respectively coupled to different data leads DL.
- the source region 61a, the drain region 61b, or the gate 71 are coupled to the data lead DL through the via a, and the other two or one is passed
- the test pin 9 located in the test hole b is coupled to the data lead DL, or the source region 61a, the drain region 61b, or the gate 71 of one target thin film transistor Tg pass through the three test pins located in the test hole b 9 is coupled with three data leads DL, that is, to ensure that the source region 61a, the drain region 61b and the gate 71 of a target thin film transistor Tg are respectively coupled to the three data leads DL, so that different voltages can be transmitted to the source respectively
- the region 61a, the drain region 61b, and the gate 71 prevent the test voltages applied to the source region 61a, the drain region 61b, and the gate 71 of the same target thin film transistor Tg from interfering with each other and affecting the test effect.
- the probe of the test equipment can be directly contacted with the data lead DL, that is, the data lead DL can be coupled
- the test pin 9 provides a test voltage, and then the test voltage is provided to the source region 61a, the drain region 61b, or the gate 71 to which the test pin 9 is coupled, so as to realize the electrical performance test of the target thin film transistor Tg. Since the size of the data lead DL is larger than that of the test pin 9, the probe of the test equipment is more likely to contact the data lead DL, and the test operation is simple and easy.
- the first side of the base substrate 1 has a multi-layer thin film layer that forms the plurality of thin film transistors, the multi-layer The thin film layer includes at least one conductive thin film layer.
- each thin film layer in the at least one conductive thin film layer is cut around the test area 100 to make the test area 100 and other Regional electrical isolation.
- the other areas include: other test areas 100 in the at least one test area 100 except for the test area 100, and non-test areas 100 in the display substrate except for the at least one test area 100.
- Each thin film layer of the at least one conductive thin film layer is cut around the test area 100, and the test area 100 can be electrically isolated from other areas, so that the target thin film transistor Tg of the test area 100 During the electrical test, it is possible to avoid the coupling between the test area 100 and other areas through the conductive thin film layer, and the voltage output by the test equipment is not fully applied to the source area 61a, the drain area 61b of the target thin film transistor Tg, or The grid 71 affects the test effect.
- test regions 100 corresponding to the two target thin film transistors Tg are adjacent
- the method for manufacturing the test substrate 02 further includes disconnecting the conductive thin film layers in the two adjacent test areas 100. In this way, during the electrical test, the conductive thin film layers of two adjacent test areas 100 are coupled, which may affect the test result.
- the multilayer thin film layers stacked in sequence are cut off.
- a focused ion beam (Focused Ion Beam, FIB) sputtering process may be used from the top to the bottom in a direction perpendicular to the film formation surface of the base substrate 1, and the data wiring layer 2 and layer as shown in FIG. 13 Thin film layers such as the interlayer insulating layer 5, the first electrode 72 layer, the second insulating layer 4, the first metal layer 7 and the first insulating layer 3 are cut.
- FIB focused ion beam
- the orthographic projection of the test pin 9 on the base substrate 1 of the first display substrate 01 is located in the source region 61a, the drain region 61b of the target thin film transistor Tg corresponding to the test pin 9 or
- the grid 71 is within the orthographic projection range on the base substrate 1. That is, as shown in FIG. 7B, the test hole b corresponding to the test pin 9 exposes only the source region 61a, the drain region 61b, or the gate 71 region of the target thin film transistor Tg, but does not expose the source The electrode region 61a, the drain region 61b, or other thin film layers around the gate 71.
- the test pin 9 located in the test hole b may be in contact with the source region 61a, the drain region 61b, or the gate 71 exposed at the bottom of the test hole b It can have better contact, which is beneficial to improve the test effect of testing the target thin film transistor Tg.
- Some embodiments of the present disclosure also provide a method for testing the test substrate 02 as described above, as shown in FIG. 15, including:
- a method of applying a voltage to at least one of the source region 61a, the drain region 61b, and the gate 71 is coupled through at least one of the source region 61a, the drain region 61b, and the gate 71
- the test pin 9 applies a voltage to at least one of the source region 61a, the drain region 61b, and the gate 71.
- the gate 71 of the target thin film transistor Tg in the case where one of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg is coupled to the data lead DL through the via a
- the gate 71 in the above S201, the probe of the testing device is overlapped with the data lead DL, that is, the test voltage can be provided to the gate 71 of the target thin film transistor Tg coupled thereto through the data lead DL .
- the source region 61a, the drain region 61b, and the gate 71 are not coupled to the data lead DL through the via a, for example, the source region 61a and the drain region 61b.
- the probe of the testing device overlaps the test pin 9 to which the source region 61a and the drain region 61b are respectively coupled, that is, the source region of the target thin film transistor Tg coupled thereto can be respectively passed through the test pin 9 61a and the drain region 61b provide the tested voltage.
- two of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg are respectively coupled to the two data leads DL through the via a
- the probe of the test device is overlapped with the two data leads DL, that is, the two data leads DL can be coupled to the
- the gate 71 and the source region 61a of the target thin film transistor Tg provide the test voltage.
- One of the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg that is not coupled to the data lead DL through the via a is, for example, the drain region 61b.
- the test equipment The probe is overlapped with the test pin 9 to which the drain region 61b is coupled, that is, the test voltage can be provided to the drain region 61b of the target thin film transistor Tg coupled thereto through the test pin 9.
- the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg are not coupled to the two data leads DL through vias a, respectively.
- the probes of the test equipment are respectively connected to the three test pins 9 to which the source region 61a, the drain region 61b, and the gate 71 are coupled, that is, the three tests can be passed
- the pin 9 provides the test voltage to the source region 61a, the drain region 61b, and the gate 71 of the target thin film transistor Tg coupled thereto, respectively.
- S202 of acquiring the transfer characteristic curve of the target thin film transistor Tg includes:
- the transfer characteristic curve of the target thin film transistor Tg is obtained according to the different voltage values applied by the thin film transistor in its source region 61a and the gate 71 and the current value output by the drain
- the transfer characteristic curve of the thin film transistor T3 is shown in FIG. 16.
- the abscissa Vg in Figure 16 is
- Vth is the threshold voltage of Tg
- IDVG0 is the drain current Id of the TFT when the gate voltage Vg of the TFT is 0V
- SS Sub-Threshold Voltage Swing
- DR- Range is the range of voltage change when the TFT switch is turned off to on
- MOB electron mobility
- I on is the on-state current of Tg
- I off is the off-state current.
- a typical value of Vth is -3.5V.
- the Vth of the target thin film transistor Tg is -1.251V, indicating that the Vth of the target thin film transistor Tg is slightly positive.
- the cause of the display abnormality can be determined according to the abnormal electrical characteristic parameter, which is caused by the abnormal electrical characteristic parameter of the TFT. Therefore, according to the detection result, in the subsequent production process of the display substrate, the manufacturing process of the thin film transistor on the display substrate can be guided and improved, so that the difference between the electrical characteristic parameters of the prepared thin film transistor and its typical value is reduced, exemplarily , Change the thin film transistor to achieve the purpose of improving product yield.
- Some embodiments of the present disclosure also provide a display substrate including a plurality of thin film transistors, and the electrical characteristic parameter of at least one of the thin film transistors is an electrical characteristic obtained by correcting an abnormal electrical characteristic parameter parameter.
- the abnormal electrical characteristic parameter is an electrical characteristic parameter obtained by testing the test substrate 02 according to the test method for the test substrate 02 (as shown in FIGS. 13 and 14) provided by the present disclosure.
- the test substrate 02 is tested to obtain the electrical characteristic parameter of the target thin film transistor Tg, the electrical characteristic parameter is an electrical characteristic parameter with an abnormality, indicating that there is at least one thin film in the substrate
- the transistor corresponds to the target thin film transistor Tg in the test substrate 02, for example, the position corresponds.
- the thin film transistor electrical characteristic parameters can be corrected by improving the preparation process or changing the microstructure of the thin film transistor, thereby improving The display effect of the display substrate.
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Abstract
Description
Vth | IDVG0 | SS | SR_Range | MOB | I on | I off |
Claims (20)
- 一种测试基板,包括:衬底基板;设置于所述衬底基板的第一侧的多个薄膜晶体管;所述多个薄膜晶体管中的每个薄膜晶体管包括硅岛和栅极,所述硅岛包括源极区、漏极区及位于二者之间的有源区;所述多个薄膜晶体管中的至少一个薄膜晶体管为待测试的目标薄膜晶体管;其中,所述测试基板具有至少一个测试区,每个所述目标薄膜晶体管位于所述至少一个测试区中的一个测试区内;所述测试基板还包括:位于所述测试区内的至少一个测试孔,所述至少一个测试孔中的每个测试孔的底部暴露出所述目标薄膜晶体管的源极区、漏极区或栅极;和,至少一个测试管脚,所述至少一个测试管脚中的每个测试管脚位于所述至少一个测试孔中的一个测试孔内,且所述测试管脚的一端穿过所述测试孔与所述目标薄膜晶体管的源极区、漏极区或栅极耦接,另一端暴露于所述测试基板的表面。
- 根据权利要求1所述的测试基板,还包括:设置于所述多个薄膜晶体管远离所述衬底基板一侧的数据引线层,所述数据引线层包括暴露于所述测试基板表面的多条数据引线;所述测试管脚与所述多条数据引线中的一条数据引线耦接;所述一条数据引线与所述测试管脚相邻,且所述目标薄膜晶体管的源极区、漏极区和栅极分别耦接不同的数据引线。
- 根据权利要求1或2所述的测试基板,还包括:设置于所述多个薄膜晶体管远离所述衬底基板的一侧的层间绝缘层;设置于所述层间绝缘层远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述测试基板表面的多条数据引线;和至少贯穿所述层间绝缘层的多个过孔;在所述目标薄膜晶体管的源极区、漏极区和栅极中的一者通过所述多个过孔中的一个过孔与数据引线直接耦接的情况下,在所述测试区内,具有两个测试孔和分别位于所述两个测试孔内的两个测试管脚;所述两个测试管脚分别与所述目标薄膜晶体管的源极区、漏极区和栅极中不通过所述一个过孔与所述数据引线直接耦接的两者耦接;或者,在所述目标薄膜晶体管的源极区、漏极区和栅极中的两者通过所述多个过孔中的两个过孔与数据引线直接耦接的情况下,在所述测试区内,具有一个测试孔和位于所述一个测试孔内的一个测试管脚;所述一个测试孔与所述目标薄膜晶体管的源极区、漏极区和栅极中不通过所述两个过孔与所述数据引线直接耦接的一者耦接。
- 根据权利要求1或2所述的测试基板,还包括:设置于所述多个薄膜晶体管远离所述衬底基板的一侧的层间绝缘层;设置于所述层间绝缘层远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述测试基板表面的多条数据引线;和至少贯穿所述层间绝缘层的多个过孔;在所述目标薄膜晶体管的源极区、漏极区和栅极均不通过所述多个过孔与数据引线直接耦接的情况下,在所述测试区,具有三个测试孔和位于所述三个测试孔内的三个测试管脚;所述三个测试管脚分别与所述目标薄膜晶体管的源极区、漏极区和栅极耦接。
- 根据权利要求1~4中任一项所述的测试基板,还包括:设置于所述衬底基板的第一侧的多层薄膜层,所述多层薄膜层形成所述多个薄膜晶体管,所述多层薄膜层包括至少一层导电的薄膜层;所述至少一层导电的薄膜层中的每层薄膜层在所述测试区周围断开,该测试区与其他区域电性隔离;其中,所述其他区域包括,所述至少一个测试区中除该测试区以外的其他测试区,及所述显示基板中除所述至少一个测试区以外的非测试区。
- 根据权利要求1~5中任一项所述的测试基板,其中,所述测试管脚在所述测试基板的衬底基板上的正投影,位于该测试孔管脚所耦接的源极区、漏极区或栅极在所述衬底基板上的正投影范围之内。
- 一种测试基板的制作方法,用于制作如权利要求1~6中任一项所述的测试基板,包括:提供第一显示基板;所述第一显示基板包括衬底基板和设置于所述衬底基板的第一侧的多个薄膜晶体管;在所述第一显示基板的多个薄膜晶体管中确定待测试的至少一个目标薄膜晶体管;所述至少一个目标薄膜晶体管中的每个目标薄膜晶体管包括硅岛和栅极,所述硅岛包括源极区、漏极区及位于二者之间的有源区;在所述第一显示基板上划分出至少一个测试区,所述目标薄膜晶体管位于所述至少一个测试区中的一个测试区内;在所述测试区内形成至少一个测试孔,所述至少一个测试孔中的每个测 试孔的底部暴露出所述目标薄膜晶体管的源极区、漏极区或栅极;在所述测试孔内形成测试管脚,所述测试管脚与其所在的测试孔所暴露出的源极区、漏极区或栅极耦接。
- 根据权利要求7所述的制作方法,其中,在所述第一显示基板还包括设置于所述多个薄膜晶体管远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述第一显示基板的表面的多条数据引线的情况下,所述制作方法还包括:在所述测试孔内形成测试管脚之后,将所述测试管脚与所述多条数据引线中的一条数据引线耦接;所述一条数据引线与所述测试管脚相邻,且不与所述测试管脚所对应的目标薄膜晶体管的源极区、漏极区和栅极中的任一者直接耦接。
- 根据权利要求7或8所述的制作方法,其中,在所述第一显示基板还包括设置于所述多个薄膜晶体管远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述第一显示基板的表面的多条数据引线,且在所述目标薄膜晶体管的源极区、漏极区和栅极中的一者与数据引线直接耦接的情况下,所述在所述测试区内形成至少一个测试孔,包括:在所述测试区内形成两个测试孔;所述两个测试孔分别暴露出所述目标薄膜晶体管的源极区、漏极区和栅极中不与所述数据引线直接耦接的两者;或者,在所述第一显示基板还包括设置于所述多个薄膜晶体管远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述第一显示基板的表面的多条数据引线,且所述目标薄膜晶体管的源极区、漏极区和栅极中的两者与数据引线直接耦接的情况下,所述在所述测试区内形成至少一个测试孔,包括:在所述测试区内形成一个测试孔;所述一个测试孔暴露出所述目标薄膜晶体管的源极区、漏极区和栅极中不与所述数据引线直接耦接的一者。
- 根据权利要求7或8所述的制作方法,其中,在所述第一显示基板还包括设置于所述多个薄膜晶体管远离所述衬底基板的一侧的数据引线层,所述数据引线层包括暴露于所述第一显示基板的表面的多条数据引线,且所述目标薄膜晶体管的源极区、漏极区和栅极均不与数据引线直接耦接的情况下,所述在所述测试区内形成至少一个测试孔,包括:在所述测试区内形成三个测试孔;所述三个测试孔分别暴露出所述目标 薄膜晶体管的源极区、漏极区和栅极。
- 根据权利要求7~10中任一项所述的制作方法,其中,在所述第一显示基板还包括设置于所述衬底基板的第一侧的多层薄膜层,所述多层薄膜层形成所述多个薄膜晶体管,所述多层薄膜层包括至少一层导电的薄膜层的情况下,所述制作方法还包括:将所述至少一层导电的薄膜层中的每层薄膜层在所述测试区周围切断,以使该测试区与其他区域电性隔离;其中,所述其他区域包括,所述至少一个测试区中除该测试区以外的其他测试区,及所述显示基板中除所述至少一个测试区以外的非测试区。
- 根据权利要求7~11中任一项所述的制作方法,其中,所述在所述测试区内形成至少一个测试孔,包括:采用聚焦离子束溅射工艺,根据至少一个溅射计算模型,在对应所述目标薄膜晶体管的源极区、漏极区和栅极中的至少一者的位置分别进行溅射,形成所述至少一个测试孔;其中,所述至少一个溅射计算模型中的每个溅射计算模型中的参数包括,待形成的测试孔开口的尺寸、待形成的测试孔的深度、及施加至离子束的电压和/或电流。
- 根据权利要求12所述的制作方法,其中,所述在所述测试区内形成至少一个测试孔,还包括:在对应所述目标薄膜晶体管源极区、漏极区和栅极中的至少一者的位置分别进行溅射时,采用终点检测方式对待形成的测试孔的实际溅射深度进行检测;当目标溅射深度与实际溅射深度之间的深度差位于深度阈值范围时,获取待形成的测试孔的图像;所述测试孔的图像为电子束图像和/或离子束图像;根据所述测试孔的图像,对待形成的测试孔继续进行溅射,直至待形成的测试孔的实际溅射深度与所述目标溅射深度相同。
- 根据权利要求7~13中任一项所述的制作方法,其中,所述在所述测试孔内形成测试管脚,所述测试管脚与其所在的测试孔所暴露出的源极区、漏极区或栅极中的一者耦接,包括:采用聚焦离子束沉积工艺,在所述测试孔内沉积金属,形成所述测试管脚。
- 根据权利要求14所述的制作方法,还包括:在所述测试孔内形成测试管脚之后,去除沉积于所述测试孔周围的残留金属。
- 根据权利要求15所述的制作方法,其中,所述去除位于所述测试孔周围的残留金属,包括:采用聚焦离子束溅射工艺,去除沉积于所述测试孔周围的残留金属;获取所述目标薄膜晶体管的图像,判断所述残留金属是否完全去除;所述目标薄膜晶体管的图像为电子束图像和/或离子束图像;若所述残留金属没有完全去除,则继续采用聚焦离子束溅射工艺去除所述残留金属;若所述残留金属完全去除,则停止采用聚焦离子束溅射工艺,对所述残留金属进行去除。
- 根据权利要求7~16中任一项所述的制作方法,其中,所述测试管脚在所述第一显示基板的衬底基板上的正投影,位于该测试管脚所耦接的目标薄膜晶体管的源极区、漏极区或栅极在所述衬底基板上的正投影范围之内。
- 根据权利要求7~17中任一项所述的制作方法,其中,所述在所述第一显示基板的多个薄膜晶体管中确定待测试的至少一个目标薄膜晶体管,包括:对第二显示基板进行点灯测试,获取缺陷所在的位置;所述第二显示基板包括多个薄膜晶体管,所述第二显示基板的多个薄膜晶体管的数量、结构和位置与所述第一显示基板的多个薄膜晶体管的数量、结构和位置对应相同;将所述缺陷所在位置处的薄膜晶体管作为缺陷薄膜晶体管;根据所述缺陷薄膜晶体管在所述第二显示基板中的位置,确定所述第一显示基板中处于相同位置的薄膜晶体管为所述至少一个目标薄膜晶体管。
- 一种对测试基板的测试方法,所述测试基板为如权利要求1~6中任一项所述的测试基板;所述测试方法包括:向所述测试基板的至少一个目标薄膜晶体管中的每个目标薄膜晶体管的源极区、漏极区和栅极分别施加电压;其中,向所述源极区、所述漏极区和所述栅极中的至少一者施加电压的方式为,通过所述源极区、所述漏极区和所述栅极中的至少一者所耦接的测试管脚,向所述源极区、所述漏极区和所述栅极中的至少一者施加电压;获取所述目标薄膜晶体管的转移特性曲线;根据所述转移特性曲线,获取所述目标薄膜晶体管的至少一种电学特征参数;将所述至少一种电学特征参数中的每一种电学特征参数与该电学特性参 数相匹配的典型值进行比对,得出存在异常的电学特征参数。
- 一种显示基板,包括多个薄膜晶体管;所述多个薄膜晶体管中的至少一个薄膜晶体管的电学特征参数为,对存在异常的电学特征参数进行校正得到的电学特征参数;所述存在异常的电学特征参数为,根据如权利要求19所述的测试方法对测试基板进行测试得到的电学特征参数。
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