CA2684818A1 - Sharing switch tfts in pixel circuits - Google Patents

Sharing switch tfts in pixel circuits Download PDF

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Publication number
CA2684818A1
CA2684818A1 CA 2684818 CA2684818A CA2684818A1 CA 2684818 A1 CA2684818 A1 CA 2684818A1 CA 2684818 CA2684818 CA 2684818 CA 2684818 A CA2684818 A CA 2684818A CA 2684818 A1 CA2684818 A1 CA 2684818A1
Authority
CA
Canada
Prior art keywords
pixel
pixel circuits
pixels
sharing switch
switch tfts
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.)
Abandoned
Application number
CA 2684818
Other languages
French (fr)
Inventor
G. Reza Chaji
Corbin Church
Arokia Nathan
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.)
Ignis Innovation Inc
Original Assignee
Ignis Innovation Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ignis Innovation Inc filed Critical Ignis Innovation Inc
Priority to CA 2684818 priority Critical patent/CA2684818A1/en
Priority to US12/944,477 priority patent/US8497828B2/en
Priority to US12/944,488 priority patent/US8283967B2/en
Priority to US12/944,491 priority patent/US8633873B2/en
Priority to EP10829593.2A priority patent/EP2499633A4/en
Priority to PCT/IB2010/002898 priority patent/WO2011058428A1/en
Priority to EP20120174465 priority patent/EP2509062A1/en
Priority to EP20120174463 priority patent/EP2506242A3/en
Priority to JP2012538429A priority patent/JP2013511061A/en
Priority to CN201080056457.4A priority patent/CN102656621B/en
Publication of CA2684818A1 publication Critical patent/CA2684818A1/en
Priority to US14/132,840 priority patent/US9030506B2/en
Priority to US14/699,752 priority patent/US9818376B2/en
Priority to JP2016072396A priority patent/JP6488254B2/en
Priority to US15/783,802 priority patent/US10685627B2/en
Abandoned legal-status Critical Current

Links

Classifications

    • 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
    • G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
    • G09G3/325—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
    • 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
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

Disclosed is a circuit and driving technique to improve the display resolution of an AMOLED
display. Sharing of switch transistors between several sub-pixels in the display leads to improved manufacturing yield by minimizing the number of transistors used. The method also allows for conventional sequential scan driving to be used.

Description

This technique can be applied to different fabrication technology including, but not limited to, poly-silicon, amorphous silicon, organic semiconductor, metal oxide, and conventional CMOS.
Also, the embodiment presented in this disclosure is one example and can be modified by different circuit techniques including complimentary circuit architectures.

Figure 1 shows an embodiment of transistor sharing in between several pixel circuits representing multiple adjacent sub-pixels. Here, a terminal of storage capacitor (CS) is connected to a shared trace within a pixel cluster (of m sub-pixels). This trace is connected to the data line through T4[j,k] switch and a reference voltage through T5[j,k] switch. During the programming of the pixels in this cluster, the T4[j,k] connected to the data line is ON
while T5[j,k] is OFF.
The pixels are programmed row by row starting from pixel [i,k]. For example, during the programming of the first pixel (e.g. pixel [i,k]), SEL [i] is low and so T2[i,k] and T3[i,k] are ON. At this point, the reference current (Iref[k]) passes through the T3[i,k]
and adjusts the voltage at the gate of Ti [i,k] to a VB[i,k] which allows the entire Iref[k]
to pass through Ti[i,k].
Thus, the voltage stored in the storage capacitor (Cs[i,k]) is VB[i,k] -VP[i,k] where VP[i,k] is the programming voltage associated with the image information at pixel[i,k].
After programming the last pixel in the cluster (e.g. pixel [i+m,k] where m is the number of pixel in a cluster), T4[j,k] is OFF and T5[j,k] is ON. Thus the voltage at the shared trace goes to Vref. Thus, the voltage at the gate of Ti transistors changes as well. For example if Vref is equal to Vddl, the gate-source voltage of Ti will go to VB[i,k] -VP[i,k] (see Figure 2), Also, Vdd[j] goes high to Vddl and as a result the pixel in this cluster are turned on. Although the duty cycle can be adjusted by the changing the timing of Vdd signals (e.g. for duty cycle of 50%
the Vdd line stays at Vddl for 50% of the frame. Thus the pixels are ON only for 50% of the frame), the maximum duty cycle can be close to 100% since only the pixels in each cluster needs to be OFF for few raw time.
Note that Vref is DC voltage here, but it can be a pulsed signal as well.
Also, the reference current is always ON and fixed, but it can be replaced with a pulsed current.

Claims
CA 2684818 2009-11-12 2009-11-12 Sharing switch tfts in pixel circuits Abandoned CA2684818A1 (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
CA 2684818 CA2684818A1 (en) 2009-11-12 2009-11-12 Sharing switch tfts in pixel circuits
US12/944,477 US8497828B2 (en) 2009-11-12 2010-11-11 Sharing switch TFTS in pixel circuits
US12/944,488 US8283967B2 (en) 2009-11-12 2010-11-11 Stable current source for system integration to display substrate
US12/944,491 US8633873B2 (en) 2009-11-12 2010-11-11 Stable fast programming scheme for displays
EP20120174463 EP2506242A3 (en) 2009-11-12 2010-11-12 Efficient programming and fast calibration schemes for light-emitting displays and stable current source/sinks for the same
PCT/IB2010/002898 WO2011058428A1 (en) 2009-11-12 2010-11-12 Efficient programming and fast calibration schemes for light-emitting displays and stable current source/sinks for the same
EP20120174465 EP2509062A1 (en) 2009-11-12 2010-11-12 Efficient programming and fast calibration schemes for light-emitting displays and stable current source/sinks for the same
EP10829593.2A EP2499633A4 (en) 2009-11-12 2010-11-12 Efficient programming and fast calibration schemes for light-emitting displays and stable current source/sinks for the same
JP2012538429A JP2013511061A (en) 2009-11-12 2010-11-12 Efficient programming and fast calibration for light-emitting displays and their stable current sources and sinks
CN201080056457.4A CN102656621B (en) 2009-11-12 2010-11-12 For effective programming of active display and quickly calibrated scheme and the constant current source/heavy for active display
US14/132,840 US9030506B2 (en) 2009-11-12 2013-12-18 Stable fast programming scheme for displays
US14/699,752 US9818376B2 (en) 2009-11-12 2015-04-29 Stable fast programming scheme for displays
JP2016072396A JP6488254B2 (en) 2009-11-12 2016-03-31 Efficient programming and fast calibration for light-emitting displays and their stable current sources and sinks
US15/783,802 US10685627B2 (en) 2009-11-12 2017-10-13 Stable fast programming scheme for displays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2684818 CA2684818A1 (en) 2009-11-12 2009-11-12 Sharing switch tfts in pixel circuits

Publications (1)

Publication Number Publication Date
CA2684818A1 true CA2684818A1 (en) 2011-05-12

Family

ID=43989527

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2684818 Abandoned CA2684818A1 (en) 2009-11-12 2009-11-12 Sharing switch tfts in pixel circuits

Country Status (1)

Country Link
CA (1) CA2684818A1 (en)

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