WO2015000275A1 - 一种像素电路、显示装置及像素电路的驱动方法 - Google Patents
一种像素电路、显示装置及像素电路的驱动方法 Download PDFInfo
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- WO2015000275A1 WO2015000275A1 PCT/CN2013/089701 CN2013089701W WO2015000275A1 WO 2015000275 A1 WO2015000275 A1 WO 2015000275A1 CN 2013089701 W CN2013089701 W CN 2013089701W WO 2015000275 A1 WO2015000275 A1 WO 2015000275A1
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- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000003321 amplification Effects 0.000 claims abstract description 50
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 50
- 239000003990 capacitor Substances 0.000 claims description 58
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005530 etching Methods 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 description 26
- 239000010409 thin film Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 229920001621 AMOLED Polymers 0.000 description 5
- 230000010354 integration Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000011664 signaling Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003126 m-cell Anatomy 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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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
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- 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
- G09G3/3258—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 voltage across the light-emitting element
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- 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
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- 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
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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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
- 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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2354/00—Aspects of interface with display user
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
- G09G2360/147—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel
- G09G2360/148—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen the originated light output being determined for each pixel the light being detected by light detection means within each pixel
Definitions
- the invention relates to display technology
- the driving method of the road is the driving method of the road.
- AMOLED Active Matrix Organic Light Emitting Diode
- AMOLED Active Matrix Organic Light Emitting Diode
- a thin film transistor is driven to drive the active matrix organic light emitting diode to emit light in response to a current generated in a saturated state.
- the thin film transistor backplane has problems of unevenness and stability during the process, resulting in a shift in the threshold voltage (Vtb) of the driving thin film transistor.
- the driving current for lighting the active matrix organic light emitting diode is related to the threshold voltage of the driving thin film transistor, when the threshold voltage of the driving thin film transistor drifts, different active matrix organic light emitting diodes receive the same data voltage (Vdata), The current that drives its illumination is also different, resulting in uneven display of the entire image.
- the present invention provides a pixel circuit, including: a driving amplification unit, a compensation unit, an illumination unit, an illumination control unit, a charging unit, a touch unit, and an output unit; and the illumination unit is respectively connected to the illumination control unit And a low voltage end, configured to perform a light emitting display under the control of the light emitting control unit; the light emitting control unit is respectively connected to the light emitting unit and the driving amplifying unit, configured to control the light emitting unit during a display phase a light emitting display; the touch unit is respectively connected to the driving amplifying unit and the low voltage end for generating a touch signal; the driving amplifying unit is respectively connected to the compensation unit, the high voltage end, and the etching unit And the hairpin control unit, configured to enlarge the touch signal generated by the touch unit during the touch phase, in the display stage
- the driving amplification unit comprises: a first transistor, a gate connected to the compensation unit and the etching unit, a first pole connected to the high voltage end, and a second pole connected to the illumination control unit and the Said output unit.
- the compensation unit comprises: a second transistor, a fourth transistor, a first capacitor and a second capacitor; the second transistor, the gate is connected to the first control signal input end, the first pole and the high voltage a second terminal connected to a gate of the first transistor; a fourth transistor, a gate connected to the first control signal input end, a first pole connected to the charging unit, and a second pole a first pole of the first transistor is connected; one end of the first capacitor is connected to a gate of the first transistor and a second pole of the third transistor, and the other end is connected to one end of the second capacitor,
- the first pole of the fourth transistor is connected to the charging unit; the second capacitor has one end connected to the low voltage end, the other end is connected to one end of the first capacitor, and the first of the fourth transistor The pole is connected to the charging unit.
- the charging unit comprises: a second transistor, the gate is connected to the second control signal input end, the first pole is connected to the data signal input end, and the second pole is connected to the first pole of the fourth transistor.
- the illumination control unit comprises: a fifth transistor, the gate is connected to the third control signal input end, the first pole is connected to the second pole of the first transistor, and the second pole is connected to the illumination unit.
- the touch unit includes: a touch signal generating unit and a seventh transistor; the touch signal generating unit has one end connected to the seventh transistor and the other end connected to the low voltage end; the seventh transistor, The gate is connected to the fourth control signal input end, the first pole and the first crystal The gate of the tube is connected, and the second pole is connected to the touch signal generating unit.
- the output unit comprises: a sixth transistor, a gate connected to the fourth control signal input end, a first pole connected to the second pole of the first transistor, and a second pole connected to the touch signal output port
- the present invention also provides a display device comprising the above pixel circuit.
- the present invention also provides a driving method of a pixel circuit, which is applied to the above pixel circuit, comprising: a touch step: the etch unit generates an etch signal, the drive amplification unit amplifies the touch signal, and the output unit outputs a The touch signal is amplified by the driving amplification unit; a threshold voltage compensation step: the high voltage terminal charges the compensation unit such that a gate voltage of the driving amplification unit is equal to a threshold voltage of the driving amplification unit; Display step: The charging unit charges the compensation unit such that a gate voltage of the driving amplification unit is equal to a sum of a data voltage output by the charging unit and the threshold voltage.
- the touching step includes: an initialization step: controlling a high level and a low level of the first control signal to the fourth control signal, controlling the first transistor, the second transistor, and the first The four transistors are turned on, controlling the second transistor, the fifth transistor, the sixth transistor, and the seventh transistor to be turned off; the etch detection step: controlling the first transistor, the sixth transistor And the seventh transistor is turned on, and the second transistor, the second transistor, the fourth transistor, and the fifth transistor are controlled to be turned off.
- the threshold voltage compensation step includes: controlling the first transistor, the third transistor, and the fourth transistor by controlling a high level and a low level of the first control signal to the fourth control signal Remotely controlling the second transistor, the fifth transistor, the sixth transistor, and the seventh transistor to be turned off, so that the high voltage terminal charges the second capacitor until a gate voltage of the first transistor is equal to a threshold voltage of the first transistor;
- the displaying step includes: controlling the second transistor and the fifth transistor to be turned on, controlling the first transistor, the third transistor, the fourth transistor, The sixth transistor and the seventh transistor are turned off, so that the data signal input terminal charges the second capacitor, such that a gate voltage of the first transistor is equal to a data voltage output by the data signal input end and the first The sum of the threshold voltages of a transistor.
- the displaying step further comprises: a display holding step: controlling the fifth transistor to be turned on by controlling the first control signal to the high and low levels of the fourth control signal, and controlling a transistor, the second transistor, the third transistor, the fourth transistor,
- the threshold voltage compensation step further includes: a buffering step: controlling the first transistor by controlling a high level and a low level of the first control signal to the fourth control signal,
- the second transistor, the third transistor, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are turned off such that a gate voltage of the first transistor is equal to the The voltage at the low voltage terminal.
- the pixel circuit of the invention has the In-cd] (built-in type) touch function, and has a display driving function capable of compensating for the threshold voltage, realizes the integration of the In-cell etch and the display drive, and is beneficial to making the display screen more complete. Thin, lighter, lowering the production cost.
- the voltage compensation even if the threshold voltage of the driving amplifying unit is drifted, different light-emitting units receive the same data voltage ⁇ , and the driving current for driving the light is also The same, so that the brightness of the entire image is displayed evenly.
- FIG. 1 is a schematic diagram of a connection of a pixel circuit of a first embodiment
- Figure 2 is: 1 embodiment 2 Figure.
- FIG. 3 is a schematic diagram of the connection of the pixel circuit of the third embodiment of the present invention.
- Figure 4 is: 1 embodiment four Figure.
- FIG. 5 is a schematic diagram of a connector of a pixel circuit of the fifth embodiment
- Figure 6 is: 1 embodiment of the pixel sequence diagram
- Touch screens can be divided into two categories: external (external) and built-in (m-cell).
- the external touch screen adds a touch device to the display panel.
- the built-in touch screen is integrated into the display panel, which makes the electronic product smaller, thinner and lighter.
- the pixel circuit in the embodiment of the present invention is a hybrid circuit having a built-in type optical touch function and a drive display function.
- FIG. 1 is a schematic diagram showing a connection structure of a pixel circuit according to a first embodiment of the present invention.
- the pixel circuit includes: a driving amplification unit 101, a compensation unit 102, a light emitting unit 103, and an illumination control unit! 04, the charging unit 105, the touch unit 106 and the output unit 107;
- the light emitting unit 103 is connected to the light emitting control unit 104 and the low voltage terminal Vss for performing light emitting display under the control of the light emitting control unit 104.
- the light emitting unit 103 may be an organic light emitting diode OLED (Organic Light) -Emitting Diode );
- the illumination control unit 104 is connected to the illumination unit 103 and the driving amplification unit 101, respectively, for controlling the illumination display of the illumination unit 103 during the display phase;
- the touch unit 106 is connected to the driving amplifying unit 101 and the low voltage terminal Vss, respectively, to generate a touch signal;
- the driving amplification unit 101 is connected to the compensation unit 102, the high voltage terminal VDD, the touch unit 106, and the illumination control unit 104, for amplifying the touch signal generated by the etch unit 106 during the touch phase.
- the output unit 107 is connected to the driving amplifying unit 101 for outputting the etched signal amplified by the driving amplifying unit 101;
- the charging unit 105 is connected to the compensation unit 102 for charging the compensation unit 102.
- the compensation unit 102 is connected to the charging unit 105, the driving amplification unit 101, the low voltage terminal Vss and the a high voltage terminal VDD for charging by the high voltage terminal VDD before the display phase, such that a gate voltage of the driving amplification unit 101 is equal to a threshold voltage of the driving amplification unit 101, in the display
- the charging unit 105 is charged such that the gate voltage of the driving amplifying unit 101 is equal to the sum of the data voltage output by the charging unit 105 and the threshold voltage.
- the voltage outputted by the high voltage terminal VDD is greater than the voltage output by the low voltage terminal Vss.
- the etch unit 106 generates a touch signal, and the drive
- the output unit 107 output is amplified by the driving
- the threshold voltage of the drive amplifying unit 101 is compensated before the display phase:
- the high voltage terminal VDD charges the compensation unit 102 such that the gate voltage of the driving amplification unit 101 is equal to the threshold voltage of the driving amplification unit 101;
- the compensation unit 102 is charged by the charging unit 105 such that the gate voltage of the driving amplification unit 101 is equal to the charging unit! The sum of the data voltage output by 05 and the threshold voltage.
- the pixel circuit provided by the above embodiment has both an Iri-eell touch function and a display drive function capable of compensating for a threshold voltage, and realizes integration of In cell etching and display driving, which is advantageous for making the display screen thinner and more. Lighter, the production cost is reduced, and at the same time, because the threshold voltage compensation is performed, even if the threshold voltage of the driving amplifying unit 101 is shifted, the driving currents for driving the different light-emitting units 103 when they receive the same data voltage are the same. , so that the brightness of the entire image is displayed evenly.
- the second embodiment of the present invention further provides a driving method of a pixel circuit. Referring to FIG. 2, FIG. 2 is a schematic flowchart diagram of a driving method of a pixel circuit according to Embodiment 2 of the present invention. Includes the following steps:
- Touching step 20h the etch unit 106 generates a touch signal, the drive amplifying unit 101 amplifies the touch signal, and the output unit 107 outputs the touch signal amplified by the drive amplifying unit 101;
- Threshold voltage compensation step 202 charging the compensation unit 102 by the high voltage terminal VDD such that a gate voltage of the driving amplification unit 101 is equal to a threshold voltage of the driving amplification unit 101;
- Display step 203 charging the compensation unit 102 remotely from the charging unit 105 such that the gate voltage of the driving amplification unit 101 is equal to the sum of the data voltage output by the charging unit 105 and the threshold voltage.
- the driving method of the pixel circuit enables the pixel circuit to have both an In-cell touch function and a display driving function capable of compensating for a threshold voltage, thereby realizing the integration of the In-cell touch and the display drive, Threshold voltage compensation is performed, even if the voltage of the explanation of the driving amplification unit 101 is shifted, the different light-emitting units 103 receive the same data voltage H, and the driving current for driving the light is the same, so that the brightness of the entire image is uniformly displayed. .
- Embodiment 3 Embodiment 3
- FIG. 3 is a schematic diagram of a connection structure of a pixel circuit according to a third embodiment of the present invention.
- the pixel circuit includes: a driving amplification unit 101, a compensation unit 102, an illumination unit 103, an illumination control unit 104, a charging unit 105, and a touch unit. 106 and output unit 107;
- the illuminating unit 103 is configured to perform illuminating display under the control of the illuminating control unit 104;
- the illumination control unit 104 is configured to control the illumination display of the illumination unit 103 during the display phase;
- the touch unit 106 is configured to generate a touch signal.
- the driving amplification unit 101 is configured to amplify a touch signal generated by the touch unit 106 during an erosive phase, and drive the light emitting unit 103 to display light during a display phase;
- the output unit 107 is configured to output the etch charging unit 105 amplified by the driving amplifying unit 101, for charging the compensation unit 102;
- the compensation unit 102 is configured to be charged by the high voltage terminal VDD before the display phase, such that a gate voltage of the driving amplification unit 101 is equal to a threshold voltage of the driving amplification unit 101, in the display In the stage, the charging unit 105 is charged such that the gate voltage of the driving amplifying unit 101 is equal to the sum of the data voltage output by the charging unit 105 and the threshold voltage.
- the driving amplification unit 101 includes: a first transistor TJU
- the charging unit 105 includes: a second transistor T2;
- the compensation unit 102 includes: a third transistor T3, a fourth transistor ⁇ 4, a first capacitor Ci, and a second capacitor C2;
- the illumination control unit 104 includes: a fifth transistor ⁇ 5;
- the output unit 107 includes: a sixth transistor ⁇ 6;
- the touch unit 106 includes: a touch signal generating unit and a seventh transistor ⁇ 7; the etch signal generating unit may be a touch capacitor or a photodiode PD;
- the first pole of the CI and the seventh transistor T7 are connected, the first pole is connected to the high voltage terminal VDD, the second pole of the second pole and the fourth transistor ⁇ 4, the first pole of the fifth transistor ⁇ 5, and the sixth transistor ⁇ 6
- the second transistor ⁇ 2 has a gate connected to the second control signal input terminal S2, a first pole connected to the data signal input terminal Data, and a second pole connected to the first pole of the fourth transistor T4;
- the third transistor T3 has a gate connected to the first control signal input terminal S1, a first pole connected to the high voltage terminal VDD, and a second pole connected to the gate of the first transistor T1;
- the fourth transistor T4 has a gate connected to the first control signal input terminal S1, a first pole connected to the second pole of the second transistor T2, and a second pole connected to the first transistor T! Two pole connection
- the first capacitor Ci the - terminal is connected to the gate of the first transistor Ti and the second electrode of the second transistor T3, and the other end is connected to one end of the second capacitor C2, the fourth transistor a first pole of T4 and a second pole of the second transistor T2 are connected;
- the second capacitor C2 has one end connected to the low voltage terminal Vss, the other end being connected to one end of the first capacitor C1, the first pole of the fourth transistor ⁇ 4, and the second pole of the second transistor ⁇ 2 connection.
- the fifth transistor ⁇ 5 has a gate connected to the third control signal input terminal S3, a first pole connected to the second pole of the first transistor Ti, and a second pole connected to the light emitting unit 103.
- the sixth transistor T6 has a gate connected to the fourth control signal input terminal S4, a first pole connected to the second pole of the first transistor Ti, and a second pole connected to the touch signal output terminal Out.
- the touch signal generating unit has one end connected to the seventh transistor T7 and the other end connected to the low voltage terminal Vss;
- the seventh transistor T7 has a gate connected to the fourth control signal input terminal S4, a first electrode connected to the gate of the first transistor Ti, and a second electrode connected to the etch signal generating unit.
- the voltage outputted by the high voltage terminal VDD is greater than the voltage output by the low voltage terminal Vss.
- controlling the first transistor T, the sixth transistor T6 and the seventh transistor T7 to be turned on by controlling the high level and the low level of the first control signal to the fourth control signal, Controlling the second transistor T2, the first transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 to be turned off;
- controlling the first transistor T1, the third transistor T3, and the fourth transistor T4 to be turned on by controlling the high level and the low level of the first control signal to the fourth control signal, and controlling the The second transistor T2, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 are turned off, so that the high voltage terminal VDD charges the second capacitor C2 until the first transistor T1 a gate voltage equal to a threshold voltage of the first transistor T1; in the display phase: controlling the second transistor ⁇ 2 and the fifth transistor ⁇ 5 by controlling a high level and a low level of the first
- the pixel circuit provided by the above embodiment has both an In-cell touch function and a display driving function capable of compensating for a threshold voltage, and realizes integration of In-cell etching and display driving, which is advantageous for making the display screen thinner. Lighter, lowering the production cost, and at the same time, because the threshold voltage compensation is performed, even if the threshold voltage of the first transistor T1 is shifted, the different driving units 103 drive the same driving voltage when receiving the same data voltage. , so that the brightness of the entire image is displayed evenly. In addition, the circuit realizes the order, further reducing the production cost.
- the fourth embodiment of the present invention further provides a method for driving a pixel circuit. Referring to FIG. 4, FIG. 4 is a schematic flowchart diagram of a driving method of a pixel circuit according to Embodiment 4 of the present invention. Includes the following steps:
- Initializing step 401 controlling the first transistor T1, the third transistor T3, and the fourth transistor T4 to be turned on by controlling the high level and the low level of the first control signal to the fourth control signal, and controlling the second The transistor ⁇ 2, the fifth transistor ⁇ 5, the sixth transistor ⁇ 6, and the seventh transistor ⁇ 7 are turned off;
- Touch detection step 402 controlling the first transistor T1, the sixth transistor ⁇ 6, and the seventh transistor ⁇ 7 to be turned on by controlling the high level and the low level of the first control signal to the fourth control signal, and controlling the Two transistors ⁇ 2, the second transistor ⁇ 3, the fourth transistor ⁇ 4, and the fifth transistor ⁇ 5 are turned off;
- the buffering step 403 controlling the first transistor T!, the second transistor T2, the third transistor T3, the fourth transistor T4, by controlling the high level and the low level of the first to fourth control signals, The fifth transistor ⁇ 5, the sixth transistor ⁇ 6, and the seventh transistor ⁇ 7 are turned off, such that a gate voltage of the first transistor T1 is equal to a voltage of the low voltage terminal Vss;
- a threshold voltage compensation step 404 Controlling the high level and the low level of the first control signal to the fourth control signal, controlling the first transistor T1, the third transistor ⁇ 3, and the fourth transistor ⁇ 4 to be turned on, controlling the second transistor ⁇ 2, the first The fifth transistor ⁇ 5, the sixth transistor ⁇ 6, and the
- Display step 405 controlling the second transistor T2 and the fifth transistor T5 to be turned on by controlling the high level and the low level of the first control signal to the fourth control signal, controlling the first transistor T1, the second transistor ⁇ 3, the fourth transistor ⁇ 4, the sixth transistor ⁇ 6, and the seventh transistor ⁇ 7 are turned off, so that the data signal input terminal charges the second capacitor C2, so that the gate of the first transistor T1
- the pole voltage is equal to a sum of a data voltage outputted by the data signal input terminal and a threshold voltage of the first transistor T1;
- the display holding step 406 remotely controlling the high level and the low level of the first control signal to the fourth control signal, controlling the fifth transistor ⁇ 5 to be turned on, and controlling the first transistor T1, the second transistor ⁇ 2, the first The transistor ⁇ 3, the fourth transistor ⁇ 4, the sixth transistor ⁇ 6, and the seventh transistor ⁇ 7 are turned off.
- the driving method of the pixel circuit enables the pixel circuit to have both an In-cell touch function and a display driving function capable of compensating for a threshold voltage, thereby realizing the integration of the In-cell touch and the display drive, Threshold voltage compensation is performed, and even if the threshold voltage of the first transistor ⁇ shifts, the different driving units 103 drive the same driving voltage when the same data voltage is received, so that the brightness of the entire image is displayed uniformly.
- the pixel circuit of the fifth embodiment of the present invention includes: a driving amplification unit, a compensation unit, a light emitting unit, an illumination control unit, a charging unit, an etching unit, and an output unit;
- the illuminating unit is configured to perform illuminating display under the control of the illuminating control unit;
- the illumination control unit is configured to control the illumination display of the illumination unit during a display phase;
- the touch unit is configured to generate a touch signal;
- the driving amplification unit is configured to amplify a touch signal generated by the touch unit during an erosive phase, and drive the light emitting unit to display light during a display phase;
- the output unit is configured to output the touch signal amplified by the driving amplification unit, and a charging unit, configured to charge the compensation unit;
- the compensation unit is configured to be charged by the high voltage terminal VDD before the display phase, such that a gate voltage of the driving amplification unit is equal to a threshold voltage of the driving amplification unit, and in the display phase, The charging unit is charged such that a gate voltage of the driving amplifying unit is equal to a sum of a data voltage output by the charging unit and the threshold voltage.
- the driving amplification unit includes: a first transistor ⁇ ;
- the charging unit includes: a second transistor T2;
- the compensation unit includes: a third transistor T3, a fourth transistor ⁇ 4, a first capacitor Ci and a second capacitor C2;
- the light emitting unit includes: an OLED;
- the illumination control unit includes: a fifth transistor T5;
- the output unit includes: a sixth transistor T6;
- the touch unit includes: a photodiode PD and a seventh transistor T7;
- the first transistor T1 has a gate connected to a source of the second transistor T3, a drain connected to the high voltage terminal VDD, and a source connected to a drain of the fifth transistor T5.
- the second transistor T2 has a gate connected to the SCAN signal input terminal, a drain connected to the data signal input terminal Data, and a source connected to the drain of the fourth transistor T4;
- the second transistor T3 has a gate connected to the CR2 signal input terminal, a drain connected to the high voltage terminal VDD, and a source connected to the gate of the first transistor Ti;
- the fourth transistor T4 has a gate connected to the CR2 signal input terminal, a drain connected to a source of the second transistor T2, and a source connected to a source of the first transistor T1;
- the first capacitor Ci the - terminal is connected to the gate of the first transistor T1 and the source of the second transistor ⁇ 3, and the other end is connected to one end of the second capacitor C2, and the fourth transistor ⁇ 4 a drain connected to a source of the second transistor T2;
- the second capacitor C2 has one end connected to the low voltage terminal Vss and the other end connected to one end of the first capacitor C!, the drain of the fourth transistor T4, and the source of the second transistor T2. .
- the fifth transistor T5 has a gate connected to the CR! signal input terminal, a drain connected to the source of the first transistor T1, and a source connected to the 0LED;
- the sixth transistor ⁇ 6 has a gate connected to the SCAN...N-1 signal input terminal, a drain connected to the source of the first transistor T1, and a source connected to the touch signal output terminal Out.
- the light emitting diode PD is connected to the seventh transistor T7, and the other end is connected to the low voltage terminal Vss;
- the seventh transistor T7 has a gate connected to the SCAN...N-1 signal input terminal, a drain connected to the gate of the first transistor T1, and a source connected to the LED PD.
- the voltage outputted by the high voltage terminal VDD is greater than the voltage output by the low voltage terminal Vss.
- SCAN__N-1 is the scan sequence signal of the upper level pixel circuit
- SCAN is the scan timing signal of the pixel circuit of this stage
- CRi and CR2 are the control signals of the pixel circuit of this stage.
- the pixel circuit of this embodiment adopts time-division driving: firstly detecting the signal of the In-cell touch screen, and then performing voltage compensation and driving of the OLED.
- In the In-cell optical etch signal detection stage by using the photodiode PD in the absence of touch and eclipse changes, causing changes in the oscillating acquisition signal, detecting and determining the coordinates of the etched position, achieving fixed-point eclipse Features.
- the first step is to write the voltage Vth of the first transistor T1 of the OLED into the first capacitor C1
- the second step is to write the Vdata voltage of the data signal to the second capacitor C2, so that the gate of the first transistor is The pole voltage is Vdata+Vth, so that the driving current of the OLED is independent of Vth, and the current is consistent, improving uniformity and reliability.
- SCAN__N-1 is low level, SCAN is low level, CR1 is low level, CR2 is high level, thin film transistors ⁇ , ⁇ 3, ⁇ 4 are all turned on, and thin film transistors ⁇ 2, ⁇ 5, ⁇ 6, ⁇ 7 are all turned off.
- the VDD voltage is written to point A, VA::::VDD.
- the voltages of the first capacitor C1 and the second capacitor C2 are VC1+VC2:::::VA- VSS::::VDD- VSS.
- the threshold voltage compensation and pixel drive of the OLED are performed:
- Threshold voltage compensation phase SCAN-N-1 is low, SCAN is low, CR1 is low, and CR2 is high.
- the thin film transistors Ti, T3, and ⁇ 4 are all turned on, and the thin film transistors ⁇ 2, ⁇ 5, ⁇ 6, and ⁇ 7 are all turned off.
- the first transistor Ti becomes a diode in saturation state, and the high voltage terminal VDD charges the second capacitor C2 through the first transistor Ti until the gate-source voltage of the first transistor T1 is the difference between the two points A and B. For Vth.
- the driving current of the first transistor Ti gate-source voltage (voltage difference between the gate and the source) Vgs-VA-Voled-Vdata + Vth ⁇ Voled, flowing through the organic light emitting diode OLED is ::: K (Vgs Vth) A 2 ::::K(Vdata+Vth ⁇ 3 ⁇ 4led - Vtb) A 2:::: (Vdata ⁇ Voled) A 2 , k is the structural parameter.
- the organic light emitting diode OLED maintains a light emitting state when the data voltage is written.
- FIG. 6 is a timing chart showing the operation of a pixel circuit according to Embodiment 5 of the present invention.
- the transistors T1 to T7 in the above embodiment are all ri iype (n-type) thin film transistors. Of course, in other embodiments of the present invention, it is not excluded that they are implemented by p-type (p-type) thin film transistors.
- An embodiment of the present invention further provides a display device, including the pixel circuit in any of the above embodiments.
- a display device including the pixel circuit in any of the above embodiments.
Abstract
Description
Claims
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US20150220201A1 (en) | 2015-08-06 |
CN103325343B (zh) | 2016-02-03 |
US9501170B2 (en) | 2016-11-22 |
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