EP1857998A1 - System zur Bildanzeige und Verfahren zur Ansteuerung eines Anzeigeelements - Google Patents

System zur Bildanzeige und Verfahren zur Ansteuerung eines Anzeigeelements Download PDF

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Publication number
EP1857998A1
EP1857998A1 EP07106338A EP07106338A EP1857998A1 EP 1857998 A1 EP1857998 A1 EP 1857998A1 EP 07106338 A EP07106338 A EP 07106338A EP 07106338 A EP07106338 A EP 07106338A EP 1857998 A1 EP1857998 A1 EP 1857998A1
Authority
EP
European Patent Office
Prior art keywords
storage capacitor
transistor
terminal
node
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07106338A
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English (en)
French (fr)
Inventor
Du-Zen Peng
Ping-Lin Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TPO Displays Corp
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TPO Displays Corp
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Filing date
Publication date
Application filed by TPO Displays Corp filed Critical TPO Displays Corp
Publication of EP1857998A1 publication Critical patent/EP1857998A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0417—Special arrangements specific to the use of low carrier mobility technology
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

Definitions

  • the invention relates to a pixel driving circuit and, in particular, to a pixel driving circuit compensating threshold voltage and power supply.
  • OLED Organic light emitting diode
  • OLED displays that use organic compounds as a lighting material to light are flat displays.
  • the advantage of the OLED displays is small size, light weight, wider viewing angle, high contrast ratio and high speed.
  • AMOLED Active matrix organic light emitting diode
  • AMLCD active matrix liquid crystal displays
  • the AMOLED display has many advantages, such as higher contrast ratio, wider viewing angle, thinner module without backlight, low power consumption, and low cost.
  • an AMOLED display requires a current source to drive a display device EL (electroluminescent).
  • the brightness of display device EL is proportional to the current conducted thereby. Variations in current level have a great impact on brightness uniformity of an AMOLED display.
  • the quality of a pixel driving circuit is critical to the quality of an AMOLED display.
  • Fig. 1 shows a conventional 2T1C (2 transistors and 1 capacitor) pixel driving circuit 10 in an AMOLED display.
  • Pixel driving circuit 10 comprises transistors Mx and My.
  • data signal shown as V data in the fig. 1 is loaded into a gate of p-type transistor My and stored in capacitor Cst.
  • a current source is implemented by a P-type TFT (My in Fig. 1) gated by data signal V data and having source and drain connected to V dd and the anode of display device EL, respectively, as shown in Fig. 1.
  • the brightness of display device EL with respect to V data therefore has the following relation. Brightness ⁇ current ⁇ V dd - V data - V th 2
  • V th is a threshold voltage of transistor My and V dd is a power supply voltage. Since there is typically a variation in V th for a LTPS type TFT due to a low temperature polysilicon (LTPS) process, it is supposed that a non-uniformity problem in brightness exists in an AMOLED display if V th is not properly compensated. Moreover, a voltage drop in the power line also causes the brightness non-uniformity problem. To overcome such problems, implementation of a pixel driving circuit with threshold voltage V th and power supply voltage V dd compensation to improve display uniformity is required.
  • LTPS low temperature polysilicon
  • the invention provides a pixel driving circuit with threshold voltage and power supply voltage compensation.
  • the pixel circuit includes a storage capacitor, a transistor, a transfer circuit, a driving element, and a switching circuit.
  • the transistor has a gate coupled to a discharge signal and is coupled between a first node and a second node.
  • the discharge signal directs the transistor to turn on and then discharges the storage capacitor during a first period.
  • the transfer circuit transfers a data signal or a reference signal to a first node of the storage capacitor.
  • the driving element has a first terminal coupled to a first voltage, a second terminal coupled to a second node of the storage capacitor, and a third terminal outputting a driving current.
  • the switching circuit is coupled between the driving element and a display element. The switching circuit is directed to diode-connect the driving element in a second period, allowing the driving current to be output to the display element in a third time period.
  • the invention provides a method for driving a display element.
  • the display element comprises a driving element and a storage capacitor.
  • the method comprises: discharging the storage capacitor through a transistor by applying a discharge signal thereto, loading a data signal into a first terminal of the storage capacitor, loading a gate voltage of the driving element into a second terminal of the storage capacitor, loading a reference signal into the first terminal of the storage capacitor, and coupling the loaded data signal, the gate voltage and the reference signal into the driving element to provide a threshold-independent driving current to the display element.
  • Fig. 1 shows a conventional 2T1C (2 transistors and 1 capacitor) pixel driving circuit in an AMOLED display
  • Fig. 2 shows a pixel driving circuit according to an embodiment of the invention
  • Fig. 3 is a timing diagram of signals of lighting signal Emi, discharge signal Discharge, scan lines Scan, and horizontal clock signals CKH1, CKH2 and CKH3 of pixel driving circuit;
  • Fig. 4 shows an AMOLED display loading data into red R, green G and blue B signal lines respectively by using horizontal clock signals CKH1, CKH2 and CKH3;
  • Fig. 5 shows a pixel driving circuit according to another embodiment of the invention.
  • Fig. 6 is a timing diagram of signals of lighting signal Emi, discharge signal Discharge, scan line signal Scan, inverse scan line signal ScanX, and horizontal clock signals CKH1, CKH2 and CKH3 of pixel driving circuit;
  • Fig. 7 schematically shows another embodiment of a system for displaying images.
  • FIG. 2 shows a pixel driving circuit according to an embodiment of the invention.
  • Pixel driving circuit 200 compensates a threshold voltage and a power supply, such that the voltage of power supply PVdd is not limited by scan signal Scan.
  • Pixel driving circuit 200 comprises storage capacitor Cst, transfer circuit 210, driving transistor M5, transistor M6 and switching circuit 220.
  • Transfer circuit 210 is coupled to first node A of storage capacitor Cst and transfers data signal Vdata or reference signal Vref to first node A of storage capacitor Cst.
  • Reference signal Vref may be a fixed voltage signal.
  • Driving transistor M5 may be a PMOS (positive-channel metal oxide semiconductor) transistor.
  • a source terminal of transistor M5 is coupled to first voltage PVdd.
  • a gate terminal of transistor M5 is coupled to second node B of storage capacitor Cst. More specifically, first voltage is power supply PVdd.
  • Switching circuit 220 is coupled to a drain terminal of transistor M5. Switching circuit 220 directs transistor M5 to operate as a diode, such that transistor M5 becomes a diode-connected transistor once fourth transistor M4 is turned on.
  • Display device EL is coupled to switching circuit 220.
  • display device EL is an electroluminescent device.
  • a cathode of display device EL is coupled to a second voltage. More specifically, the second voltage is voltage VSS or ground voltage.
  • Transfer circuit 210 comprises first transistor M1 and second transistor M2, as shown in Fig. 2, wherein first transistor M1 and second transistor M2 are a NMOS (negative-channel metal oxide semiconductor) and a PMOS transistor respectively.
  • a drain terminal of first transistor M1 receives data signal Vdata.
  • a gate terminal and a source terminal of first transistor M1 are connected to first scan line Scan and first node A of storage capacitor Cst, respectively.
  • a source terminal of second transistor M2 receives reference signal Vref.
  • a gate terminal and a drain terminal of second transistor M2 are connected to scan line Scan and first node A of storage capacitor Cst, respectively.
  • transistors M1 and M2 are polysilicon thin film transistors, providing higher current driving capability.
  • transfer circuit 210 When scan line Scan is pulled high, transfer circuit 210 transfers data signal Vdata to first node A of storage capacitor Cst. When scan line Scan is pulled low, transfer circuit 210 transfers reference signal Vref to first node A of storage capacitor Cst.
  • Switching circuit 220 comprises third transistor M3 and fourth transistor M4.
  • third transistor M3 is a PMOS transistor and fourth transistor M4 is a NMOS transistor.
  • a drain terminal of third transistor M3 is connected to an anode of display device EL, while a gate terminal and a source terminal of third transistor M3 are connected to lighting signal Emi and driving transistor M5 respectively.
  • Fourth transistor M4 comprises a source terminal coupled to driving transistor M5 and third transistor M3.
  • a drain terminal of fourth transistor M4 is coupled to second node B of storage capacitor Cst, a source terminal of transistor M6 and a gate terminal of driving transistor M5.
  • a gate terminal of fourth transistor M4 is connected to scan line Scan.
  • transistors M3 and M4 are polysilicon thin film transistors, providing higher current driving capability.
  • fourth transistor M4 of switch circuit 220 directs driving transistor M5 to operate as a diode, becoming a diode-connected transistor once fourth transistor M4 is turned on.
  • a drain terminal of transistor M6 is coupled to first node A of storage capacitor Cst.
  • a gate terminal of transistor M6 is coupled to discharge signal Discharge.
  • a source terminal of transistor M6 is coupled to second node B of storage capacitor Cst, the drain terminal of transistor M4 and the gate terminal of driving transistor M5.
  • Fig. 3 is a timing diagram of signals of lighting signal Emi, discharge signal Discharge, scan lines Scan, and horizontal clock signals CKH1, CKH2 and CKH3 of pixel driving circuit 200 shown in Fig. 2.
  • discharge mode S1 transistor M6 is turned on, and a high-level reference signal Vref is input to first node A and second node B of storage capacitor Cst. The charge stored in storage capacitor Cst is thus discharged in this discharge mode. The discharge of storage capacitor Cst ensures normal operation in subsequent steps.
  • pixel driving circuit 200 Following the discharge of storage capacitor Cst, scan signal Scan is pulled high, then pixel driving circuit 200 enters data load mode S2.
  • scan signal Scan is pulled high, first transistor M1 and fourth transistor M4 are turned on while second transistor M2 and transistor M6 are turned off. Since first transistor M1 and fourth transistor M4 are turned on, the voltage of first node A of storage capacitor Cst equals the voltage of data signal Vdata, where V th is the threshold voltage of driving transistor M5.
  • Fig. 4 shows an AMOLED display loading data into red R, green G and blue B signal lines respectively by using horizontal clock signals CKH1, CKH2 and CKH3.
  • scan line signal Scan at row1, row2,...or rown is high, in data load mode S2, horizontal clock signals CKH1, CKH2 and CKH3 respectively turn on switches SW1, SW2 and SW3 sequentially and data is loaded in red R, green G and blue B signal lines sequentially.
  • Fig. 5 shows pixel driving circuit 500 according to another embodiment of the invention.
  • Pixel driving circuit 500 compensates a threshold voltage and a power supply, such that voltage of power supply PVdd is not limited by scan signal Scan.
  • Pixel driving circuit 500 is similar to pixel driving circuit 200, except for transistors M7 and M8 of Fig. 5 being NMOS transistors while second transistor M2 and third transistor M3 of Fig. 2 are PMOS transistors.
  • a gate terminal of transistor M7 of Fig. 5 is coupled to inverse scan line signal ScanX.
  • the phase of inverse scan line signal ScanX is opposite to that of scan line signal Scan.
  • Fig. 6 is a timing diagram of signals of lighting signal Emi, discharge signal Discharge, scan line signal Scan, inverse scan line signal ScanX, and horizontal clock signals CKH1, CKH2 and CKH3 of pixel driving circuit 500 shown in Fig. 5.
  • discharge mode S1 transistor M6 is turned on, and a high-level reference signal Vref is input to first node A and second node B of storage capacitor Cst. The charge stored in storage capacitor Cst is thus discharged in this discharge mode. The discharge of storage capacitor Cst ensures normal operation in subsequent steps.
  • Fig. 7 schematically shows another embodiment of a system for displaying images which, in this case, is implemented as display panel 400 or electronic device 600.
  • display panel 400 comprises a pixel driving circuit 200 of Fig. 2.
  • Display panel 400 can form a portion of a variety of electronic devices (in this case, electronic device 600).
  • electronic device 600 can comprise display panel 400 and power supply 700.
  • power supply 700 is operatively coupled to display panel 400 and provides power to display panel 400.
  • Electronic device 600 can be a mobile phone, digital camera, PDA (personal data assistant), notebook computer, desktop computer, television, or portable DVD player, for example.
  • PDA personal data assistant
  • Fig. 5 The operation of Fig. 5 is similar to that of Fig. 2.
  • the electrical current through display device EL of Fig. 5 is proportional to (Vsg-Vth) 2 and is also proportional to (Vdata-Vref) 2 .
  • the current through display device EL of Fig. 5 is independent of threshold voltage V th of driving transistor M5 as well as power supply PVdd. The operation repeats continuously to control pixel emissions.
  • Pixel driving circuits 200 and 500 (FIGs. 2 and 5) of the embodiments of the present invention are independent of threshold voltage V th of driving transistor M5 as well as power supply PVdd.
  • Power supply PVdd and scan line signal Scan are independent of each other.
  • the voltage range of scan line signal Scan is not limited by the voltage range of power supply PVdd, and vice versa.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP07106338A 2006-05-19 2007-04-17 System zur Bildanzeige und Verfahren zur Ansteuerung eines Anzeigeelements Withdrawn EP1857998A1 (de)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102665321A (zh) * 2011-12-30 2012-09-12 友达光电股份有限公司 发光二极管电路,驱动发光二极管电路的方法及显示器
CN104021763A (zh) * 2014-06-11 2014-09-03 合肥鑫晟光电科技有限公司 像素电路、显示装置和像素电路的驱动方法
CN104252845A (zh) * 2014-09-25 2014-12-31 京东方科技集团股份有限公司 像素驱动电路、方法、显示面板和显示装置
WO2015058582A1 (zh) * 2013-10-25 2015-04-30 京东方科技集团股份有限公司 Amoled像素驱动电路及其驱动方法、阵列基板
CN106205491A (zh) * 2016-07-11 2016-12-07 京东方科技集团股份有限公司 一种像素电路、其驱动方法及相关装置
CN107134261A (zh) * 2017-06-28 2017-09-05 武汉华星光电半导体显示技术有限公司 像素电路及其控制方法、显示面板
EP3618046A4 (de) * 2017-04-28 2020-11-18 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Anzeigetafel, pixeltreiberschaltung und ansteuerverfahren dafür
CN114271031A (zh) * 2019-08-30 2022-04-01 株式会社三丰 用于高速计量成像的快速高功率脉冲式光源系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197472A1 (en) * 2002-04-23 2003-10-23 Tohoku Pioneer Corporation Drive unit and drive method of light-emitting display panel
US20050088378A1 (en) * 2003-09-17 2005-04-28 Seiko Epson Corporation Electronic circuit, method of driving the same, electro-optical device, and electronic apparatus
EP1536405A2 (de) * 2003-11-27 2005-06-01 Samsung SDI Co., Ltd. Lichtemittierende Anzeigevorrichtung, Anzeigetafel, und Verfahren zur deren Ansteuerung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030197472A1 (en) * 2002-04-23 2003-10-23 Tohoku Pioneer Corporation Drive unit and drive method of light-emitting display panel
US20050088378A1 (en) * 2003-09-17 2005-04-28 Seiko Epson Corporation Electronic circuit, method of driving the same, electro-optical device, and electronic apparatus
EP1536405A2 (de) * 2003-11-27 2005-06-01 Samsung SDI Co., Ltd. Lichtemittierende Anzeigevorrichtung, Anzeigetafel, und Verfahren zur deren Ansteuerung

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102665321A (zh) * 2011-12-30 2012-09-12 友达光电股份有限公司 发光二极管电路,驱动发光二极管电路的方法及显示器
CN102665321B (zh) * 2011-12-30 2014-04-16 友达光电股份有限公司 发光二极管电路,驱动发光二极管电路的方法及显示器
WO2015058582A1 (zh) * 2013-10-25 2015-04-30 京东方科技集团股份有限公司 Amoled像素驱动电路及其驱动方法、阵列基板
CN104021763A (zh) * 2014-06-11 2014-09-03 合肥鑫晟光电科技有限公司 像素电路、显示装置和像素电路的驱动方法
CN104252845A (zh) * 2014-09-25 2014-12-31 京东方科技集团股份有限公司 像素驱动电路、方法、显示面板和显示装置
US9640109B2 (en) 2014-09-25 2017-05-02 Boe Technologies Group Co., Ltd. Pixel driving circuit, pixel driving method, display panel and display device
CN106205491A (zh) * 2016-07-11 2016-12-07 京东方科技集团股份有限公司 一种像素电路、其驱动方法及相关装置
CN106205491B (zh) * 2016-07-11 2018-09-11 京东方科技集团股份有限公司 一种像素电路、其驱动方法及相关装置
EP3618046A4 (de) * 2017-04-28 2020-11-18 Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. Anzeigetafel, pixeltreiberschaltung und ansteuerverfahren dafür
CN107134261A (zh) * 2017-06-28 2017-09-05 武汉华星光电半导体显示技术有限公司 像素电路及其控制方法、显示面板
CN107134261B (zh) * 2017-06-28 2019-07-12 武汉华星光电半导体显示技术有限公司 像素电路及其控制方法、显示面板
CN114271031A (zh) * 2019-08-30 2022-04-01 株式会社三丰 用于高速计量成像的快速高功率脉冲式光源系统

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