WO2013189152A1 - 静电放电保护电路、阵列基板和显示装置 - Google Patents
静电放电保护电路、阵列基板和显示装置 Download PDFInfo
- Publication number
- WO2013189152A1 WO2013189152A1 PCT/CN2012/084979 CN2012084979W WO2013189152A1 WO 2013189152 A1 WO2013189152 A1 WO 2013189152A1 CN 2012084979 W CN2012084979 W CN 2012084979W WO 2013189152 A1 WO2013189152 A1 WO 2013189152A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gate
- thin film
- film transistor
- protection circuit
- display device
- Prior art date
Links
- 239000000758 substrate Substances 0.000 title claims abstract description 15
- 239000010409 thin film Substances 0.000 claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0248—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection
- H01L27/0251—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices
- H01L27/0296—Particular design considerations for integrated circuits for electrical or thermal protection, e.g. electrostatic discharge [ESD] protection for MOS devices involving a specific disposition of the protective devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
-
- 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
- G02F1/136204—Arrangements to prevent high voltage or static electricity failures
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/046—Signalling the blowing of a fuse
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
Definitions
- Electrostatic discharge protection circuit array substrate and display device
- the present invention relates to the field of display technologies, and in particular, to an electrostatic discharge protection circuit, an array substrate, and a display device. Background technique
- the gate lines of each row and the data lines of each column form an active matrix.
- an Electro-Static Discharge (ESD) protection circuit is connected to each data line to release the accumulated charge. , to avoid damage to the device caused by excessive voltage pulses.
- TFTs thin film transistors
- a-Si amorphous silicon
- LTPS low temperature poly-silicon
- Oxide TFT Oxide TFT or the like.
- the oxide TFT has the characteristics of high mobility, good uniformity, and low cost, and is suitable for the manufacture of large-sized panels.
- the oxide TFT is usually depleted, that is, the gate of the TFT.
- Vgs source voltage
- Vgs source voltage
- the ESD protection circuit will also generate leakage current when the display device is operating normally.
- the Vgs of the two TFTs are 0V.
- the drain sources of the two TFTs are continuously turned on, thereby forming a high level output.
- the VGH to the low-level output terminal VGL's DC path causes the data line DATA to leak, which increases the power consumption and affects the output of the data voltage.
- An electrostatic discharge protection circuit includes: a first thin film transistor having a drain connected to a high level output terminal; a second thin film transistor having a source a source connected to the first thin film transistor as a discharge end, a drain connected to the high level output terminal, a gate connected to the low level output terminal, and a third thin film transistor having a source and a gate connected thereto a low level output terminal having a drain connected to a gate of the first thin film transistor; and a voltage difference holding unit connected between a gate of the first thin film transistor and the discharge end, wherein the voltage The difference holding unit is configured to keep a voltage difference between a gate of the first thin film transistor and the discharge end, and the discharge end is used to connect a gate line or a data line.
- the voltage difference maintaining unit is a capacitor.
- the voltage difference holding unit is a fourth thin film transistor having a source connected to a drain thereof and a gate of the first thin film transistor, and a gate connected to the discharge end .
- An array substrate comprising: a plurality of gate lines and data lines;
- each of the gate lines and/or data lines is connected to a discharge end of one of the ESD protection circuits.
- a display device comprising: the above array substrate.
- the high-level output terminal voltage is greater than the discharge terminal voltage, and the discharge terminal voltage is greater than the low-level output terminal voltage.
- the gate and the source of the third thin film transistor are both connected to the low-level output. Therefore, the third thin film transistor is turned on, so that the gate voltage of the first thin film transistor is released to the low level output terminal, the first thin film transistor
- the second thin film transistor is also turned off. Therefore, when the display device is working normally, the display device is not normally displayed.
- the embodiment of the present invention solves the problem of leakage of the depletion mode TFT existing in the conventional ESD protection circuit when the display device operates normally, and reduces the power consumption while improving the reliability of the display device.
- FIG. 1 is a schematic diagram of an ESD protection circuit of the prior art
- FIG. 2 is a schematic diagram of an ESD protection circuit according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of another ESD protection circuit according to an embodiment of the present invention.
- FIG. 4 is a schematic view of an array substrate according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of another array substrate according to an embodiment of the present invention. detailed description
- an electrostatic discharge ESD protection circuit including: a first thin film transistor T1 having a drain connected to a high level output terminal and a high level output terminal being denoted by VGH;
- the second thin film transistor T2 has a source connected to the source of the first thin film transistor T1 as a discharge terminal 0, a drain connected to the high level output terminal VGH, and a gate connected to the low level output terminal, a low level
- the output terminal is represented by VGL;
- the third thin film transistor T3 has a source and a gate connected to the low level output terminal VGL, a drain connected to the gate of the first thin film transistor T1, and a first thin film transistor T1 connected thereto.
- the voltage difference holding unit may be the capacitor C.
- the discharge terminal 0 can be connected to the data line DATA for releasing static electricity on the data line.
- the above circuit is used for an array substrate fabricated by a depletion TFT, that is, a thin film transistor in an ESD protection circuit is depleted.
- the ESD protection circuit does not work when the display device is operating normally.
- the ESD protection circuit provides an electrostatic discharge path when electrostatic discharge occurs.
- Vgh>VDATA>Vgl where Vgh represents a high level outputted by the high level output terminal, VDATA is the data line voltage, and Vgl represents a low level outputted by the low level output terminal.
- VDATA is the data line voltage
- Vgl represents a low level outputted by the low level output terminal.
- the data line DATA voltage VDATA is 0 ⁇ 5V
- the high level Vgh is 10 ⁇ 15V
- the low level Vgl is -10 ⁇ -15V.
- the voltage difference stored on capacitor C is VDATA-Vgl
- Vg VDATA because Vg VDATA, T1 is turned off
- T1 is connected to one end of VGH as a source, and one end of data line DATA is connected as a drain, and the gate of T1 is used.
- the pole voltage is much larger than the source voltage, which is enough to make T1 turn on, so that the positive charge on the data line DATA is released from T1 to VGH.
- the data line DATA has a negative high voltage pulse, and the negative high voltage is used.
- VLO indicates that VLO is much smaller than Vgl.
- the discharge terminal 0 can also be connected to the gate. Line, used to discharge static electricity on the grid. Principle and operation body and the above-mentioned embodiment, not repeated here.
- the ESD protection circuit of the embodiment of the invention solves the problem of leakage of the depletion TFT existing in the conventional ESD protection circuit during normal operation of the display device, and improves the reliability of the display device while reducing the power consumption.
- the voltage difference maintaining unit may be a capacitor C directly composed of a metal layer
- the voltage difference holding unit may be a fourth thin film transistor T4 whose source is connected to the drain thereof and the gate of the first thin film transistor T1, and whose gate is connected to the discharge terminal 0. Since the gate of the fourth thin film transistor T4 has an insulating layer between the source and the drain, T4 can be used as a capacitor at this time, and the gate and the source and drain are the two poles of the capacitor. Therefore, T4 has the same function as the capacitor, so that the voltage difference between the gate of the first thin film transistor T1 and the discharge terminal 0 remains unchanged.
- the thin film transistor T4 is different from the other thin film transistors described above, the T4 may be a depletion type or an enhancement type.
- the ESD protection circuit of the embodiment of the invention solves the problem of leakage of the depletion TFT existing in the conventional ESD protection circuit during normal operation of the display device, and improves the reliability of the display device while reducing the power consumption.
- an array substrate including: a plurality of gate lines GATE and data lines DATA; a plurality of the above ESD protection circuits; wherein each of the data lines DATA and one ESD
- the discharge terminal 0 in the protection circuit is connected to discharge static electricity on the data line DATA.
- each gate line GATE is coupled to a discharge terminal 0 (not shown) in an ESD protection circuit for discharging static electricity on the gate line.
- each of the gate lines GATE and the data lines DATA are each connected to the discharge terminal 0 in an ESD protection circuit for discharging static electricity on the data lines and the gate lines.
- the array substrate of the embodiment of the invention solves the problem of leakage of the depletion TFT existing in the conventional ESD protection circuit during normal operation of the display device, and improves the reliability of the display device while reducing the power consumption.
- a display device comprising: the above array substrate.
- the specific structure and working principle of the ESD protection circuit in this embodiment are the same as those in the foregoing embodiment, and will not be further described herein.
- the display device of the embodiment of the invention solves the problem of leakage of the depletion TFT existing in the conventional ESD protection circuit during normal operation of the display device, and improves the reliability of the display device while reducing the reliability of the display device. Power consumption.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Semiconductor Integrated Circuits (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/995,134 US9099859B2 (en) | 2012-06-21 | 2012-11-21 | Electro-static discharge protection circuit, array substrate and display apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201210212575.0A CN103515941B (zh) | 2012-06-21 | 2012-06-21 | 静电放电保护电路、阵列基板和显示装置 |
CN201210212575.0 | 2012-06-21 |
Publications (1)
Publication Number | Publication Date |
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WO2013189152A1 true WO2013189152A1 (zh) | 2013-12-27 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CN2012/084979 WO2013189152A1 (zh) | 2012-06-21 | 2012-11-21 | 静电放电保护电路、阵列基板和显示装置 |
Country Status (3)
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US (1) | US9099859B2 (zh) |
CN (1) | CN103515941B (zh) |
WO (1) | WO2013189152A1 (zh) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104113053B (zh) * | 2014-04-21 | 2017-05-24 | 京东方科技集团股份有限公司 | 静电放电保护电路、显示基板和显示装置 |
CN103995407B (zh) * | 2014-05-08 | 2016-08-24 | 京东方科技集团股份有限公司 | 阵列基板和显示面板 |
CN105280632B (zh) * | 2015-09-18 | 2018-06-05 | 京东方科技集团股份有限公司 | 一种静电防护电路及显示装置 |
CN105813365B (zh) * | 2016-05-23 | 2018-01-02 | 京东方科技集团股份有限公司 | 一种静电保护电路、显示面板及显示装置 |
CN106909010B (zh) * | 2017-05-10 | 2020-03-10 | 京东方科技集团股份有限公司 | 一种静电防止电路、阵列基板及显示装置 |
CN106997132B (zh) * | 2017-05-27 | 2019-03-15 | 京东方科技集团股份有限公司 | 一种显示基板及显示装置 |
CN107402464B (zh) * | 2017-07-21 | 2019-12-24 | 惠科股份有限公司 | 一种静电放电电路和显示面板 |
CN107611952B (zh) * | 2017-09-14 | 2019-04-05 | 惠科股份有限公司 | 静电放电防护电路及其应用的显示装置 |
CN110676254B (zh) * | 2019-11-08 | 2022-04-12 | 福州京东方光电科技有限公司 | 静电保护电路、阵列基板、显示装置 |
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2012
- 2012-06-21 CN CN201210212575.0A patent/CN103515941B/zh active Active
- 2012-11-21 US US13/995,134 patent/US9099859B2/en active Active
- 2012-11-21 WO PCT/CN2012/084979 patent/WO2013189152A1/zh active Application Filing
Patent Citations (5)
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CN1766722A (zh) * | 2004-10-28 | 2006-05-03 | 中华映管股份有限公司 | 薄膜晶体管阵列基板、液晶显示面板及其静电防护方法 |
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CN101089685A (zh) * | 2006-06-15 | 2007-12-19 | Lg.菲利浦Lcd株式会社 | 用于液晶显示器件的阵列基板 |
Also Published As
Publication number | Publication date |
---|---|
US20140192444A1 (en) | 2014-07-10 |
CN103515941B (zh) | 2015-12-02 |
CN103515941A (zh) | 2014-01-15 |
US9099859B2 (en) | 2015-08-04 |
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