WO2016000346A1 - 像素电路及其驱动方法和显示装置 - Google Patents
像素电路及其驱动方法和显示装置 Download PDFInfo
- Publication number
- WO2016000346A1 WO2016000346A1 PCT/CN2014/088393 CN2014088393W WO2016000346A1 WO 2016000346 A1 WO2016000346 A1 WO 2016000346A1 CN 2014088393 W CN2014088393 W CN 2014088393W WO 2016000346 A1 WO2016000346 A1 WO 2016000346A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- switching element
- pixel
- electrically connected
- unit
- pixel circuit
- Prior art date
Links
Images
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
- G09G3/3258—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
-
- 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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting 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
- 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
- G09G2300/0426—Layout of electrodes and connections
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- 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]
- G09G3/3266—Details of drivers for scan electrodes
Definitions
- the present disclosure relates to a pixel circuit, a driving method thereof, and a display device.
- AMOLED Active Matrix/Organic Light Emitting Diode
- OLED Organic Light Emitting Diode
- TFT thin film transistor
- LTPS Low Temperature Poly-silicon
- a pixel circuit including a plurality of pixel units arranged in a matrix, each of the pixel units including a sub-pixel unit and a light emitting element, the sub-pixel unit including the light emitting element Connected drive transistors, where:
- the pixel circuit further includes a row sharing unit; the row sharing unit is electrically connected to each pixel unit of the corresponding row through the first connection line;
- the pixel circuit further includes a column sharing unit; the column sharing unit is electrically connected to each pixel unit of the corresponding column through the second connection line;
- a sub-pixel unit of each pixel unit, a row sharing unit corresponding to the pixel unit, and a column sharing unit corresponding to the pixel unit constitute a circuit having a threshold voltage compensation function for the driving transistor in the sub-pixel unit.
- the sub-pixel unit includes a driving transistor, a second switching element, a third switching element, and a first capacitor, wherein: a gate of the driving transistor and the first a second end of the second switching element, a first end of the first capacitor, and a second end of the third switching element are electrically connected; a source of the driving transistor and a second end of the first capacitor are both a low level voltage line is electrically connected; a drain of the driving transistor is electrically connected to a first end of the third switching element, and is electrically connected to a second end of the light emitting element; One end is electrically connected to the second connecting line; the control end of the third switching element is electrically connected to the first control signal line, and the control end of the second switching element is electrically connected to the second control signal line.
- the row sharing unit includes a fourth switching element, and the second end thereof is electrically connected to the first end of the light emitting element in each pixel unit of the corresponding row through the first connection line;
- the first end of the four switching element is electrically connected to the high level voltage line, and the control end of the fourth switching element is electrically connected to the third control signal line.
- the column sharing unit includes a second capacitor and a fifth switching element, and the second end of the second capacitor and the second end of the fifth switching element pass through the second connecting line and the corresponding column a first end of the second switching element in a sub-pixel unit of each pixel unit is electrically connected; a first end of the second capacitor is electrically connected to a gray scale write voltage line of a pixel unit of a corresponding column; The control terminal of the fifth switching element is electrically connected to the initial control signal line, and the first end of the fifth switching element is electrically connected to the first voltage signal line.
- the driving transistor and the switching element are field effect transistors
- the first end of the switching element is a drain of a field effect transistor
- the second end of the switching element is a source of a field effect transistor
- the control terminal of the switching element is the gate of the FET.
- the field effect transistor is a thin film transistor.
- the light emitting element is an organic light emitting diode.
- the row sharing unit and the column sharing unit are located outside the effective display area of the pixel circuit.
- a display device comprising any of the above pixel circuits.
- a driving method of a pixel circuit wherein the pixel circuit adopts the above pixel circuit, and the driving method comprises:
- An initialization step in the initialization phase, the signals on the first control signal line, the second control signal line, and the initial control signal line are simultaneously active, the second switching element, the third switching element, and the The fifth switching element is turned on, the driving crystal
- the potential at the gate of the body tube is set to the voltage on the first voltage signal line;
- a threshold voltage reading step in the threshold voltage reading phase, the signals on the first control signal line and the second control signal line are simultaneously active, and the second switching element and the third switching element are turned on, a potential at a gate of the driving transistor is discharged through the first capacitor to compensate a threshold voltage of the driving transistor;
- Gray-scale writing step in the gray-scale writing phase, the signal on the second control signal line is first valid and then turned into invalid, the second switching element is turned on and then turned off, and the gray-scale writing voltage line is The upper voltage is written to the gate of the driving transistor;
- a light emitting step in the light emitting phase, a signal on the third control signal line is valid, a gate potential of the driving transistor is held by the first capacitor, and the driving transistor is turned on to drive the light emitting element Glowing.
- Embodiments of the present disclosure are based on the original pixel units arranged in a matrix, and the circuit that implements the threshold voltage compensation function is divided into three parts: a row sharing portion, a column sharing portion, and a pixel self-use portion. Corresponding to each of the light-emitting elements, the row in which they share the same row-shared unit, the column in which they share the same column-shared unit, and one self-use one-pixel unit. In such a structure, the circuit for realizing the threshold voltage compensation function is simplified, and the component consumption and layout space are saved with the reduction of components used, which not only reduces the cost, but also reduces the pixel size of the AMOLED and realizes a high PPI.
- FIG. 1 is a schematic diagram of a conventional 2T1C basic AMOLED pixel unit
- FIG. 2 is a schematic diagram of a 6T2C AMOLED pixel unit with threshold voltage compensation
- FIG. 3 is a schematic diagram of an AMOLED pixel circuit composed of 6T2C pixel units
- FIG. 4 is a block diagram showing the structure of a pixel circuit in an embodiment of the present disclosure.
- FIG. 5(a) is a circuit configuration diagram of a pixel unit in a pixel circuit in an embodiment of the present disclosure
- 5(b) is a circuit configuration diagram of a row sharing unit in a pixel circuit in an embodiment of the present disclosure
- 5(c) is a circuit configuration diagram of a column sharing unit in a pixel circuit in an embodiment of the present disclosure
- FIG. 6 is a circuit diagram of a pixel circuit in one embodiment of the present disclosure.
- FIG. 7 is a timing chart showing the operation of a pixel circuit in an embodiment of the present disclosure.
- FIG. 8 is a circuit operation diagram of an initialization phase in a driving method in an embodiment of the present disclosure.
- FIG. 9 is a circuit operation diagram of a threshold voltage reading phase in a driving method in an embodiment of the present disclosure.
- FIG. 10 is a circuit operation diagram of a gray scale writing phase in a driving method in an embodiment of the present disclosure
- FIG. 11 is a schematic diagram of the circuit operation when the OLED in the driving method in one embodiment of the present disclosure is normally illuminated.
- Figure 1 shows a schematic diagram of a conventional 2T1C basic AMOLED pixel unit.
- the conventional 2T1C (2 TFT and 1 capacitor) circuits shown in Figure 1 have poor brightness uniformity.
- a circuit for driving a threshold voltage compensation function of a TFT is often added to a pixel design of an LTPS-based AMOLED in the prior art.
- a common design for AMOLED pixel circuits with threshold voltage compensation requires 6T2C or requires more components.
- the increase in the number of TFTs or capacitors will occupy a large layout space, which is not conducive to the reduction of the size of the AMOLED pixel, that is, the limitation of the AMOLED of high PPI (Pixels Per Inch, the number of pixels per inch).
- FIG. 2 shows a schematic diagram of a 6T2C AMOLED pixel cell with threshold voltage compensation.
- the 6T2C AMOLED pixel circuit (each 6T2C Pixel represents one pixel unit) has a threshold voltage compensation function of the driving tube T1, which solves the OLED illumination unevenness caused by the LTPS threshold voltage uniformity difference.
- the threshold voltage compensation switch TFT, the gray scale voltage write switch TFT and the drive TFT of the pixel are all designed in the pixel, and a larger number of TFTs are needed, as shown in FIG.
- a - illuminating element b - sub-pixel unit; c - row sharing unit; d - column sharing unit; T1 - driving transistor (driving TFT); T2 - second switching element (switching TFT); - third switching element (initializing TFT); T4 - fourth switching element (lighting control TFT); T5 - fifth switching element (initial voltage input TFT); C1 - first capacitance (storage capacitance); C2 - second capacitor (input coupling capacitor); EM_1, ..., EM_n, EM_last - the first, ..., n rows and the last row of the third control signal line; INITIAL - the initial control signal line; OLED - the light-emitting element ( Organic light-emitting diodes; GATE_1, ..., GATE_n-1, GATE_n, GATE_n+1, GATE_last - the first, ..., n-1, n, n+1 rows and the last row
- Vdata_m-1 / Vdata_m / Vdata_m + 1 / Vdata_last - grayscale write Input voltage (“_” followed by column number); V H - OLED anode voltage (ie voltage on the first connection line); V P - T1 gate voltage; GND - ground voltage.
- the circuit includes a pixel circuit including a plurality of pixel units arranged in a matrix, each pixel unit including a sub-pixel unit b and a light-emitting element a,
- the sub-pixel unit b includes a driving transistor electrically connected to the light emitting element a, wherein: the pixel circuit further includes a row sharing unit c corresponding to each row of pixel units; and the row sharing unit c corresponds to the first connecting line
- Each pixel unit of the row is electrically connected; corresponding to each column of pixel units, the pixel circuit further includes a column sharing unit d; the column sharing unit d is electrically connected to each pixel unit of the corresponding column through the second connection line;
- the sub-pixel unit b of the pixel unit, the row sharing unit c corresponding to the pixel unit, and the column sharing unit d corresponding to the pixel unit are configured to perform a threshold voltage compensation function on the driving transistor in the sub-
- each sub-pixel unit b can independently perform the function of display driving of the light-emitting element a; and the row-share unit c, the column-share unit d, and the sub-pixel unit b corresponding thereto can realize the sub-pixel unit
- the threshold voltage compensation function of the drive transistor in b By adopting such a structure, the circuit portion realizing the threshold voltage compensation function can share the same row common unit c in the same row, and share the same column common unit d in the same column, thereby saving component consumption and layout space.
- the sub-pixel unit b includes a driving transistor T1, a second switching element T2, a third switching element T3, and a first capacitor C1, wherein: a gate of the driving transistor T1 and a second end of the second switching element T2 The first end of the first capacitor C1 and the second end of the third switching element T3 are electrically connected; the source of the driving transistor T1 and the second end of the first capacitor C1 are both low level
- the voltage line VSS is electrically connected; the drain of the driving transistor T1 is electrically connected to the first end of the third switching element T3, and is electrically connected to the second end of the light emitting element OLED; the second switching element T2 The first end is electrically connected to the second connection line DATA; the control end of the third switching element T3 is electrically connected to the first control signal line CN1, and the control end of the second switching element T2 and the second control signal Line CN2 is electrically connected.
- the row sharing unit c includes a fourth switching element T4 whose second end is electrically connected to the first end of the light-emitting element a in each pixel unit of the corresponding row through the first connection line VH;
- the first end of the four switching element T4 is electrically connected to the high level voltage line VDD, and the control end of the fourth switching element T4 is electrically connected to the third control signal line EM.
- the column sharing unit d includes a second capacitor C2 and a fifth switching element T5, and the second end of the second capacitor C2 and the second end of the fifth switching element T5 pass through the second connecting line DATA
- the first end of the second switching element T2 in the sub-pixel unit b corresponding to each column of the pixel unit is electrically connected; the first end of the second capacitor C2 and the gray-scale writing voltage line of the pixel unit of the corresponding column
- the DATA_IN is electrically connected; the control terminal of the fifth switching element T5 is electrically connected to the initial control signal line INITIAL, and the first end of the fifth switching element T5 is electrically connected to the first voltage signal line VINI.
- the driving transistor T1 and the switching element are field effect transistors.
- the first end of the switching element is the drain of the FET, the second end of the switching element is the source of the FET, and the control end of the switching element is the gate of the FET.
- the field effect transistor is a thin film transistor.
- the light-emitting element is an organic light-emitting diode OLED, which of course may also be a double-ended light-emitting element that is driven by other currents.
- the row sharing unit c and the column sharing unit d are located outside the effective display area of the pixel circuit.
- the design can reduce the total number of components in the effective display area, which is beneficial to the improvement of the PPI.
- the first capacitor is a storage capacitor
- the second capacitor is a coupling capacitor
- FIG. 6 is a pixel unit shown in FIG. 5(a), a row sharing unit shown in FIG. 5(b), and FIG. 5(c).
- the column sharing unit shown is a circuit composed of the basic unit and corresponds to the block diagram of the pixel circuit shown in FIG.
- the pixel circuit includes: at least one column of pixels A pixel array arranged in a row, a row sharing unit c (constituting a row sharing circuit) and a column sharing unit d (constituting a column sharing circuit) of one column per row; the pixel unit including a driving transistor T1 ( Driving TFT), second switching element T2 (switching TFT), third switching element T3 (initializing TFT), first capacitor C1 (storage capacitor), and organic light emitting diode OLED, gate of the driving transistor T1 and second switch
- the source of the element T2 and the source of the third switching element T3 are connected to each other and connected to the source of the driving transistor T1 via the first capacitor C1; the cathode of the organic light emitting diode OLED and the drain and the third switch of the driving transistor T1
- the drain of the element T3 is connected.
- the row sharing unit c includes a fourth switching element T4 (light emitting control TFT) whose source is connected to the anode of the organic light emitting diode OLED in each pixel unit of the corresponding row;
- the column sharing unit d includes the second capacitor C2 and the
- the fifth switching element T5 is connected to the first terminal of the second capacitor C2 and the source of the fifth switching element to the drain of the second switching element T2 in each pixel unit of the corresponding column.
- FIG. 6 A circuit configuration diagram including the pixel unit (a+b), the row common unit c, and the column common unit d is shown in FIG. 6. It can be seen that each row of pixels shares a row sharing unit, including sharing the same transistor and sharing the same first signal line (ie, the line connected to the anode of the organic light emitting diode in FIG. 6); each column of pixels shares a column sharing unit, including Sharing the same transistor and the same capacitor, and sharing the gray-scale write voltage line (ie, the line connected to the first end of the capacitor in the column sharing unit of FIG.
- the switching elements in the above pixel circuit realize their functions as switches in the digital circuit, and other types of transistors may have corresponding functions, and are not limited to one type of TFT.
- the capacitors C1 and C2 used in the above pixel circuit are respectively a storage capacitor and an input coupling capacitor.
- Other types of capacitors have the same function in proper use environment and parameter setting, and are not limited to the types proposed herein. Therefore, the use of other types of transistors or capacitors of the same function, as long as they also implement the overall circuit design by the row sharing unit c and the column sharing unit d, are included in the scope of protection of the present disclosure.
- the pixel circuit works as follows:
- V DD is a high level voltage line
- V SS is a low level voltage line
- the drain is supplied with a constant first voltage signal V INI (provided by the first voltage signal line VINI; see Figure 7, when driving each row of pixel cells (such as the nth row), loading in the corresponding (nth row)
- the third control signal EM_n on the gate of the fourth switching element T4 in the row sharing unit c is changed from a high level to a low level, and sequentially passes through a time-fixed initialization phase (A), and a threshold voltage reading phase (B) And the gray-scale writing phase (C) returns to the high level;
- the initial control signal V INITIAL (the INITIAL in Figure 7 is provided by the initial control signal line INTIAL) loaded at the gate of all the fifth switching elements T5 is only in the a high level in the initialization phase;
- the initialization-threshold voltage reading-gray-level writing process is completed according to the above method, and then the corresponding OLED is illuminated by the driving current.
- Fig. 7 is a timing chart showing the operation of the pixel circuit, in which the high and low level variations of the respective voltages in each stage have been indicated. Unmentioned V DD and V SS always supply a high level voltage and a low level voltage to the pixel circuit.
- EM_n is low
- INITIAL INITIAL
- CN_1_n INITIAL
- CN_2_n high
- DATA_IN is GND.
- T2, T3, and T5 are turned on
- T4 is turned off
- the OLED anode voltage VH is floating (floating, numerically indefinite).
- T4 remains off, T2, T3 remain on, and T5 turns off from on.
- the other end of C1 is V SS , and the other end of C2 is GND (DATA), so that the voltage across C1 is V th -V SS , and the voltage across C1 and C2 is 0.
- the threshold voltage Vth of T1 is read out and can be processed.
- C 1 and C 2 are the capacitance values of C1 and C2. Since one end of C1 and C2 is connected, the voltage at the other end of C2 changes, which will affect the voltage at the junction of C1 and C2. According to the formula of capacitive coupling, the voltage change at the junction of C1 and C2 is The voltage V DATA is multiplied by C2/(C1+C2). Then CN_2_n turns to low level, T2 is turned off, and the gate of T1 is also the point where V P is held by storage capacitor C1.
- EM_n is turned to a high level, and CN_1_n and CN_2_n are at a low level.
- T2 and T3 are turned off, T4 is turned on, and the OLED anode voltage V H is changed from floating to V DD .
- V P remains under the action of storage capacitor C1
- the OLED is driven. It can be seen that the driving current of the final OLED is independent of the threshold voltage Vth of T1, that is, the threshold voltage compensation function that the conventional 2T1C (FIG. 1) pixel unit does not have is realized.
- each pixel unit of the driving circuit uses only 3 transistors and 1 capacitor, and the number of components in each pixel unit is greatly reduced compared with the 6T2C pixel unit (Figs. 2 to 3), and only in A row column common unit d and a row row sharing unit c are disposed outside the effective display area, which saves component consumption and layout space, not only reduces the cost, but also reduces the pixel size of the AMOLED and realizes a high PPI.
- an embodiment of the present disclosure further provides a display device including any one of the above-described pixel circuits that performs display driving by any of the above-described driving methods.
- the display device can be any product or component having a display function such as an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like. Since it has the same technical features as any of the above-described pixel circuits, the same technical problem is solved and the same technical effects are achieved.
- the driving method includes:
- An initialization step in the initialization phase A, the signals on the first control signal line, the second control signal line, and the initial control signal line are simultaneously active, the second switching element, the third switching element, and The fifth switching element is turned on, the potential at the gate of the driving transistor is set to a voltage on the first voltage signal line;
- the threshold voltage reading step is: in the threshold voltage reading phase B, the first control signal a signal on the line and the second control signal line is simultaneously active, the second switching element and the third switching element are turned on, and a potential at a gate of the driving transistor is discharged through the first capacitor to compensate Threshold voltage of the driving transistor;
- gray scale writing step in the gray level writing phase C, the signal on the second control signal line is first valid and then turned into invalid, The second switching element is turned on and off first, and the voltage on the gray-scale write voltage line is written to the gate of the driving transistor; and the light-emitting step: in the light-emitting phase, the signal on the third control signal line is valid, The gate potential of
- the present disclosure adopts a partial TFT sharing method to implement a threshold voltage compensation function with a 3T1C pixel circuit, which is advantageous for reducing the size of an AMOLED pixel and achieving a high PPI.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
Description
Claims (10)
- 一种像素电路,包括呈矩阵排列的多个像素单元,每个像素单元包括子像素单元和发光元件,所述子像素单元包括与所述发光元件电连接的驱动晶体管,其中:对应于每行像素单元,所述像素电路还包括行共用单元;所述行共用单元通过第一连接线与对应行的每个像素单元电连接;对应于每列像素单元,所述像素电路还包括列共用单元;所述列共用单元通过第二连接线与对应列的每个像素单元电连接;每个像素单元的子像素单元、与该像素单元对应的行共用单元以及与该像素单元对应的列共用单元组成具有对该子像素单元中的所述驱动晶体管进行阈值电压补偿功能的电路。
- 根据权利要求1所述的像素电路,其中,所述子像素单元还包括第二开关元件、第三开关元件和第一电容,其中:所述驱动晶体管的栅极与所述第二开关元件的第二端、所述第一电容的第一端以及所述第三开关元件的第二端电连接;所述驱动晶体管的源极与所述第一电容的第二端都与低电平电压线电连接;所述驱动晶体管的漏极与所述第三开关元件的第一端电连接,并与所述发光元件的第二端电连接;所述第二开关元件的第一端与所述第二连接线电连接;所述第三开关元件的控制端与第一控制信号线电连接,所述第二开关元件的控制端与第二控制信号线电连接。
- 根据权利要求1或2所述的像素电路,其中,所述行共用单元包括第四开关元件,其第二端通过所述第一连接线与对应行的每个像素单元中的所述发光元件的第一端电连接;所述第四开关元件的第一端与高电平电压线电连接,所述第四开关元件的控制端与第三控制信号线电连接。
- 根据权利要求1至3中任意一项所述的像素电路,其中,所述列共用 单元包括第二电容和第五开关元件,所述第二电容的第二端、所述第五开关元件的第二端都通过所述第二连接线与对应列每个像素单元的子像素单元中的所述第二开关元件的第一端电连接;所述第二电容的第一端与对应列的像素单元的灰阶写入电压线电连接;所述第五开关元件的控制端与初始控制信号线电连接,所述第五开关元件的第一端与第一电压信号线电连接。
- 根据权利要求2至4中任意一项所述的像素电路,其中,所述驱动晶体管和开关元件为场效应管,所述开关元件的第一端为场效应管的漏极,所述开关元件的第二端为场效应管的源极,所述开关元件的控制端为场效应管的栅极。
- 根据权利要求5所述的像素电路,其中,所述场效应管为薄膜晶体管。
- 根据权利要求1至6中任意一项所述的像素电路,其中,所述发光元件为有机发光二极管。
- 根据权利要求1至7中任意一项所述的像素电路,其中,所述行共用单元和列共用单元位于所述像素电路的有效显示区域外部。
- 一种显示装置,包括如权利要求1至8中任意一项所述的像素电路。
- 一种像素电路的驱动方法,所述像素电路采用如权利要求4所示的像素电路,所述驱动方法包括:初始化步骤:在初始化阶段,所述第一控制信号线、所述第二控制信号线和所述初始控制信号线上的信号同时有效,所述第二开关元件、所述第三开关元件和所述第五开关元件开启,所述驱动晶体管的栅极处的电位被设置为第一电压信号线上的电压;阈值电压读取步骤:在阈值电压读取阶段,所述第一控制信号线和所述第二控制信号线上的信号同时有效,所述第二开关元件和所述第三开关元件开启,所述驱动晶体管的栅极处的电位通过所述第一电容放电,以补偿驱动晶体管的阈值电压;灰阶写入步骤:在灰阶写入阶段,所述第二控制信号线上的信号先为有效后转为无效,所述第二开关元件先开启后关闭,所述灰阶写入电压线上的电压写入所述驱动晶体管的栅极;发光步骤:在发光阶段,所述第三控制信号线上的信号有效,所述驱动 晶体管的栅极电位在所述第一电容的作用下被保持,所述驱动晶体管开启从而驱动所述发光元件发光。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/652,558 US10204555B2 (en) | 2014-07-03 | 2014-10-11 | Pixel circuit and driving method thereof, and display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410317208.6 | 2014-07-03 | ||
CN201410317208.6A CN104123912B (zh) | 2014-07-03 | 2014-07-03 | 像素电路及其驱动方法、显示装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016000346A1 true WO2016000346A1 (zh) | 2016-01-07 |
Family
ID=51769302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2014/088393 WO2016000346A1 (zh) | 2014-07-03 | 2014-10-11 | 像素电路及其驱动方法和显示装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US10204555B2 (zh) |
CN (1) | CN104123912B (zh) |
WO (1) | WO2016000346A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109920359A (zh) * | 2019-03-29 | 2019-06-21 | 上海天马有机发光显示技术有限公司 | 显示面板、显示面板驱动方法以及显示装置 |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103531106B (zh) * | 2013-10-28 | 2015-06-03 | 京东方科技集团股份有限公司 | 一种有源有机发光二极管显示背板、显示设备 |
CN104123912B (zh) * | 2014-07-03 | 2016-10-19 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示装置 |
CN104575387B (zh) * | 2015-01-26 | 2017-02-22 | 深圳市华星光电技术有限公司 | Amoled像素驱动电路及像素驱动方法 |
KR20170074618A (ko) * | 2015-12-22 | 2017-06-30 | 엘지디스플레이 주식회사 | 유기 발광 표시 장치의 서브-화소 및 이를 포함하는 유기 발광 표시 장치 |
CN106935200A (zh) * | 2015-12-29 | 2017-07-07 | 上海和辉光电有限公司 | 有机发光显示装置及其驱动方法 |
CN105761674B (zh) | 2016-04-07 | 2018-07-06 | 京东方科技集团股份有限公司 | 像素电路、应用于像素电路的驱动方法、以及阵列基板 |
CN107731156B (zh) | 2016-08-12 | 2020-02-21 | 京东方科技集团股份有限公司 | 补偿像素电路、显示面板、显示设备、补偿及驱动方法 |
CN106205494B (zh) * | 2016-09-09 | 2019-05-31 | 深圳市华星光电技术有限公司 | Amoled像素驱动电路及像素驱动方法 |
CN106710525B (zh) * | 2017-01-06 | 2019-02-05 | 上海天马有机发光显示技术有限公司 | 有机发光显示面板及其驱动方法、有机发光显示装置 |
CN110400536B (zh) * | 2018-04-23 | 2020-12-25 | 上海和辉光电股份有限公司 | 一种像素电路及其驱动方法、显示面板 |
CN109036279B (zh) * | 2018-10-18 | 2020-04-17 | 京东方科技集团股份有限公司 | 阵列基板、驱动方法、有机发光显示面板及显示装置 |
CN110364117B (zh) * | 2019-07-17 | 2021-10-01 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示面板和显示装置 |
CN110660359B (zh) * | 2019-09-29 | 2022-03-29 | 合肥京东方卓印科技有限公司 | 像素驱动电路及其驱动方法、显示面板和显示装置 |
CN111063299A (zh) * | 2020-01-02 | 2020-04-24 | 合肥维信诺科技有限公司 | 显示面板的电源补偿电路、电源补偿方法和显示面板 |
CN111583864B (zh) | 2020-06-11 | 2021-09-03 | 京东方科技集团股份有限公司 | 显示驱动电路及其驱动方法、显示装置 |
CN111564140B (zh) * | 2020-06-12 | 2021-03-26 | 京东方科技集团股份有限公司 | 显示基板及显示装置 |
CN113920923B (zh) * | 2021-10-18 | 2022-09-09 | 深圳市华星光电半导体显示技术有限公司 | 发光器件驱动电路、背光模组以及显示面板 |
CN117238245A (zh) * | 2023-11-07 | 2023-12-15 | 惠科股份有限公司 | 显示面板和显示装置 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101192372A (zh) * | 2006-11-28 | 2008-06-04 | 奇美电子股份有限公司 | 显示面板及其结构 |
CN101281723A (zh) * | 2008-05-23 | 2008-10-08 | 上海广电光电子有限公司 | 有机发光显示器的像素电路及其驱动方法 |
US20090021455A1 (en) * | 2007-07-18 | 2009-01-22 | Miller Michael E | Reduced power consumption in oled display system |
CN101996581A (zh) * | 2010-11-29 | 2011-03-30 | 四川虹视显示技术有限公司 | 一种有机发光显示器件的像素电路 |
CN102044213A (zh) * | 2009-10-21 | 2011-05-04 | 京东方科技集团股份有限公司 | 电流驱动像素电路及其驱动方法、有机发光显示器件 |
CN103531151A (zh) * | 2013-11-04 | 2014-01-22 | 京东方科技集团股份有限公司 | Oled像素电路及驱动方法、显示装置 |
CN103714778A (zh) * | 2013-12-16 | 2014-04-09 | 京东方科技集团股份有限公司 | 像素电路、像素电路的驱动方法和显示装置 |
CN104123912A (zh) * | 2014-07-03 | 2014-10-29 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示装置 |
CN203950533U (zh) * | 2014-07-03 | 2014-11-19 | 京东方科技集团股份有限公司 | 像素电路及显示装置 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7088318B2 (en) * | 2004-10-22 | 2006-08-08 | Advantech Global, Ltd. | System and method for compensation of active element variations in an active-matrix organic light-emitting diode (OLED) flat-panel display |
US8319307B1 (en) * | 2004-11-19 | 2012-11-27 | Voxtel, Inc. | Active pixel sensors with variable threshold reset |
JP5160748B2 (ja) * | 2005-11-09 | 2013-03-13 | 三星ディスプレイ株式會社 | 発光表示装置 |
US8004477B2 (en) * | 2005-11-14 | 2011-08-23 | Sony Corporation | Display apparatus and driving method thereof |
KR100916866B1 (ko) * | 2005-12-01 | 2009-09-09 | 도시바 모바일 디스플레이 가부시키가이샤 | El 표시 장치와 el 표시 장치의 구동 방법 |
JP5240544B2 (ja) * | 2007-03-30 | 2013-07-17 | カシオ計算機株式会社 | 表示装置及びその駆動方法、並びに、表示駆動装置及びその駆動方法 |
US7985978B2 (en) | 2007-04-17 | 2011-07-26 | Himax Technologies Limited | Display and pixel circuit thereof |
TWI328772B (en) | 2007-04-20 | 2010-08-11 | Hon Hai Prec Ind Co Ltd | Network device and rebooting method thereof |
KR101472063B1 (ko) * | 2008-04-10 | 2014-12-15 | 삼성디스플레이 주식회사 | 표시 패널을 구동하기 위한 데이터 생성 방법과, 이를수행하기 위한 데이터 구동회로 및 이 데이터 구동회로를포함하는 표시 장치 |
JP4737221B2 (ja) * | 2008-04-16 | 2011-07-27 | ソニー株式会社 | 表示装置 |
KR101082283B1 (ko) | 2009-09-02 | 2011-11-09 | 삼성모바일디스플레이주식회사 | 유기전계발광 표시장치 및 그의 구동방법 |
KR101781137B1 (ko) * | 2010-07-20 | 2017-09-25 | 삼성디스플레이 주식회사 | 유기전계발광 표시장치 |
CN102654975B (zh) * | 2011-11-01 | 2014-08-20 | 京东方科技集团股份有限公司 | Amoled驱动补偿电路、方法及其显示装置 |
CN202512329U (zh) * | 2012-04-20 | 2012-10-31 | 华映视讯(吴江)有限公司 | 液晶面板 |
KR101985243B1 (ko) * | 2012-09-26 | 2019-06-05 | 엘지디스플레이 주식회사 | 유기전계발광표시장치, 이의 구동방법 및 이의 제조방법 |
CN103077680B (zh) * | 2013-01-10 | 2016-04-20 | 上海和辉光电有限公司 | 一种oled像素驱动电路 |
JP2014219516A (ja) * | 2013-05-07 | 2014-11-20 | 三星ディスプレイ株式會社Samsung Display Co.,Ltd. | 画素回路及びその駆動方法 |
KR101603300B1 (ko) * | 2013-11-25 | 2016-03-14 | 엘지디스플레이 주식회사 | 유기발광표시장치 및 그 표시패널 |
-
2014
- 2014-07-03 CN CN201410317208.6A patent/CN104123912B/zh active Active
- 2014-10-11 WO PCT/CN2014/088393 patent/WO2016000346A1/zh active Application Filing
- 2014-10-11 US US14/652,558 patent/US10204555B2/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101192372A (zh) * | 2006-11-28 | 2008-06-04 | 奇美电子股份有限公司 | 显示面板及其结构 |
US20090021455A1 (en) * | 2007-07-18 | 2009-01-22 | Miller Michael E | Reduced power consumption in oled display system |
CN101281723A (zh) * | 2008-05-23 | 2008-10-08 | 上海广电光电子有限公司 | 有机发光显示器的像素电路及其驱动方法 |
CN102044213A (zh) * | 2009-10-21 | 2011-05-04 | 京东方科技集团股份有限公司 | 电流驱动像素电路及其驱动方法、有机发光显示器件 |
CN101996581A (zh) * | 2010-11-29 | 2011-03-30 | 四川虹视显示技术有限公司 | 一种有机发光显示器件的像素电路 |
CN103531151A (zh) * | 2013-11-04 | 2014-01-22 | 京东方科技集团股份有限公司 | Oled像素电路及驱动方法、显示装置 |
CN103714778A (zh) * | 2013-12-16 | 2014-04-09 | 京东方科技集团股份有限公司 | 像素电路、像素电路的驱动方法和显示装置 |
CN104123912A (zh) * | 2014-07-03 | 2014-10-29 | 京东方科技集团股份有限公司 | 像素电路及其驱动方法、显示装置 |
CN203950533U (zh) * | 2014-07-03 | 2014-11-19 | 京东方科技集团股份有限公司 | 像素电路及显示装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109920359A (zh) * | 2019-03-29 | 2019-06-21 | 上海天马有机发光显示技术有限公司 | 显示面板、显示面板驱动方法以及显示装置 |
CN109920359B (zh) * | 2019-03-29 | 2022-06-10 | 武汉天马微电子有限公司 | 显示面板、显示面板驱动方法以及显示装置 |
Also Published As
Publication number | Publication date |
---|---|
US20160284274A1 (en) | 2016-09-29 |
CN104123912B (zh) | 2016-10-19 |
CN104123912A (zh) | 2014-10-29 |
US10204555B2 (en) | 2019-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2016000346A1 (zh) | 像素电路及其驱动方法和显示装置 | |
CN107358915B (zh) | 一种像素电路、其驱动方法、显示面板及显示装置 | |
CN110268465B (zh) | 像素电路、显示面板及像素电路的驱动方法 | |
CN110520922B (zh) | 显示驱动电路、方法、以及显示设备 | |
EP3159882B1 (en) | Pixel circuit, driving method therefor and display device | |
TWI459352B (zh) | 顯示器 | |
US9747839B2 (en) | Pixel driving circuit, driving method, array substrate and display apparatus | |
US10032415B2 (en) | Pixel circuit and driving method thereof, display device | |
WO2015180354A1 (zh) | 像素电路、像素电路的驱动方法和显示装置 | |
JP5171807B2 (ja) | 表示装置およびその駆動方法 | |
WO2016011714A1 (zh) | 像素电路、像素电路的驱动方法和显示装置 | |
US11328671B2 (en) | Pixel circuit, shift register unit, gate driving circuit and display device | |
WO2015180353A1 (zh) | 像素电路及其驱动方法、oled显示面板和装置 | |
WO2016011719A1 (zh) | 像素驱动电路、驱动方法、阵列基板及显示装置 | |
WO2016011711A1 (zh) | 像素电路、像素电路的驱动方法和显示装置 | |
WO2015196597A1 (zh) | 像素电路、显示面板和显示装置 | |
US9437142B2 (en) | Pixel circuit and display apparatus | |
JP6108856B2 (ja) | 表示装置及びそれを用いた電子機器及び表示装置の駆動方法 | |
US20150145849A1 (en) | Display With Threshold Voltage Compensation Circuitry | |
WO2018219066A1 (zh) | 像素电路、驱动方法、显示面板及显示装置 | |
WO2019174228A1 (zh) | 像素电路及其驱动方法、显示面板 | |
WO2022061852A1 (zh) | 像素驱动电路及显示面板 | |
JP2009008799A (ja) | 表示装置およびその駆動方法 | |
US20210335233A1 (en) | Pixel circuit and method of driving the same, display device | |
WO2019047701A1 (zh) | 像素电路及其驱动方法、显示装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 14652558 Country of ref document: US |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14896561 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 04/05/2017) |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 14896561 Country of ref document: EP Kind code of ref document: A1 |