WO2016011707A1 - 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
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- WO2016011707A1 WO2016011707A1 PCT/CN2014/088407 CN2014088407W WO2016011707A1 WO 2016011707 A1 WO2016011707 A1 WO 2016011707A1 CN 2014088407 W CN2014088407 W CN 2014088407W WO 2016011707 A1 WO2016011707 A1 WO 2016011707A1
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- 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- 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
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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Definitions
- the present disclosure relates to a pixel circuit, a driving method thereof, and a display device.
- OLED Organic light-emitting diode
- LCD liquid crystal
- PDA PDA
- digital cameras Pixel driver circuit design is the core technology content of OLED display, which has important research significance.
- OLEDs are current driven and require a constant current to control illumination.
- the threshold voltage of the driving TFT of each pixel Due to process fabrication and device aging, in the original 2T1C driver circuit (including two thin film transistors and one capacitor), the threshold voltage of the driving TFT of each pixel has unevenness, which leads to the flow of each pixel. The current of the point OLED changes so that the display brightness is uneven, thereby affecting the display effect of the entire image.
- a pixel circuit generally corresponds to one pixel, and each pixel circuit includes at least one data voltage line, one working voltage line, and a plurality of scanning signal lines, which results in a complicated manufacturing process and is disadvantageous for reducing pixel pitch. .
- At least one embodiment of the present invention avoids the problem of display device display unevenness in brightness, and reduces the number of signal lines for the pixel circuit in the display device, reduces the cost of the integrated circuit, and increases the pixel density of the display device.
- At least one embodiment of the present invention provides a pixel circuit including a data voltage writing module and two driving modules, two lighting modules; wherein the data voltage writing module is connected to the data voltage line, the write control line, and the two driving modules.
- the data voltage writing module is connected to the data voltage line, the write control line, and the two driving modules.
- the first driving module is connected to the first lighting module
- the second driving module is connected to the second lighting module
- the two driving modules are connected to the working voltage line and the driving control line, and are used for
- the corresponding light emitting module is driven to emit light under the control of the driving control line.
- the data voltage writing module includes a first sub data voltage writing module and a second sub data voltage writing module, the first sub data voltage writing module and the data voltage line, the first write control line, and the first driving The modules are connected, and the second sub-data voltage writing module is connected to the data voltage line, the second write control line and the second driving module.
- each sub-data voltage write module includes a write transistor having a gate connected to a corresponding write control line, a source connected to the data voltage line, and a drain connected to the corresponding drive module.
- each of the driving modules includes three driving transistors and one storage capacitor, wherein a source of the first driving transistor is connected to a drain of the corresponding writing transistor, and a gate and a drain are both connected to a gate of the second driving transistor. Connected; the drain of the second driving transistor is connected to the source of the third driving transistor, the source is connected to the data voltage line; the gate of the third driving transistor is connected to the driving control line, and the drain is connected to the light emitting module; the storing A first end of the capacitor is coupled to the gate of the second drive transistor, and a second end is coupled to the source of the second drive transistor.
- the method further includes a first reset transistor and a second reset transistor, the gate of the first reset transistor is connected to the reset control line, the source is connected to the first end of the storage capacitor of the first driving module, and the drain is connected The low level line is reset; the gate of the second reset transistor is connected to the reset control line, the source is connected to the first end of the storage capacitor of the second driving module, and the drain connection is resetting the low level line.
- each of the driving modules includes four driving transistors and one storage capacitor; wherein a gate of the first driving transistor is connected to the driving control line, a source is connected to the working voltage line, and a drain is connected to a source of the second driving transistor; The gate of the second driving transistor is connected to the first end of the storage capacitor, the drain is connected to the source of the third driving transistor; the gate of the third driving transistor is connected to the driving control line, the drain is connected to the light emitting module; the drain of the fourth driving transistor is Connecting a drain of the second driving transistor, the source is connected to the first end of the storage capacitor; the second end of the storage capacitor is grounded; the fourth driving transistor gate of the first driving module is connected to the first write control line, and the second driving module is The fourth driving transistor gate is connected to the second write control line.
- the method further includes a first reset transistor and a second reset transistor, wherein the gates of the two reset transistors are connected to the reset control line; the source of the first reset transistor is connected to the storage of the first driving module a first end of the capacitor, the drain is connected to the second end of the storage capacitor of the first driving module; the source of the second reset transistor is connected to the first end of the storage capacitor of the second driving module, and the drain is connected to the second driving module The second end of the storage capacitor.
- the method further includes a capacitive touch detection module and a light touch detection module, the capacitive touch detection module including a first touch transistor, a second touch transistor, a third touch transistor, a first sensing capacitor, and Touching the electrode, the gate of the first touch transistor is connected to the reset control line, the source is connected to the data voltage line, the drain is connected to the first end of the first sensing capacitor; the gate of the second touch transistor is connected to the first sensing capacitor a first end, the source is connected to the second end of the first sensing capacitor, the drain is connected to the source of the third touch transistor; the gate of the third touch transistor is connected to the first write control line, and the drain is connected to the touch signal read line
- the second end of the first sensing capacitor is further connected to the detecting driving voltage line; the touch electrode is connected to the gate of the second touch transistor;
- the light sensing touch detection module includes a fourth touch transistor, a fifth touch transistor, a sixth touch transistor, a seventh touch transistor and a second sensing capacitor, and a gate of the fourth touch transistor is connected to the second write control line, the source
- the pole is connected to the data voltage line
- the drain is connected to the first end of the second sensing capacitor
- the gate and the drain of the fifth touch transistor are connected to the first end of the second sensing capacitor
- the source is connected to the second sensing capacitor a second end
- a gate of the sixth touch transistor is connected to the driving control line
- a source is connected to the second end of the second sensing capacitor
- a drain is connected to the touch signal reading line
- a gate of the seventh touch transistor is connected to the reset control line
- the source is connected to the first end of the second sensing capacitor, and the drain is grounded
- the fifth touch transistor is a photo transistor.
- each of the driving modules includes four driving transistors and a storage capacitor.
- the gate of the first driving transistor is connected to the first driving control line, and the source is connected to the drains and drains of the second driving transistor and the third driving transistor. Connecting the working voltage line; the gate of the second driving transistor is connected to the second driving control line, the source is connected to the first end of the storage capacitor; the gate of the third driving transistor is connected to the first end of the storage capacitor, and the source is connected to the light emitting module;
- the gate and the drain of the fourth driving transistor are connected to the first end of the storage capacitor, and the source is connected to the corresponding write transistor; the second end of the storage capacitor is connected to the low-level line.
- the data voltage writing module includes three write transistors, wherein a gate of the first write transistor is connected to the first write control line, a source is connected to the data voltage line, and a drain is connected to a source of the second write transistor; a gate of the second write transistor is connected to a drain of the first driving module and the third write transistor, a drain is connected to a source of the third write transistor, and a second driving module; a gate connection of the third write transistor is Two write control lines.
- each of the driving modules includes two driving transistors and one storage capacitor, wherein a source of the first driving transistor is connected to the working voltage line, a drain is connected to a source of the second driving transistor, and a gate of the second driving transistor is Connecting a driving control line, the source is connected to the drain of the first driving transistor, the drain is connected to the light emitting module; the storage capacitor is connected between the gate and the source of the first driving transistor; the gate of the first driving transistor of the first driving module The gate is connected to the gate of the second write transistor, and the gate of the first drive transistor of the second drive module is connected to the drain of the second write transistor.
- the reset transistor is further included, the gate of the reset transistor is connected to the reset control line, the source is connected to the drain of the second write transistor, and the drain is connected to reset the low level line.
- the present invention also provides a method for driving any one of the above pixel circuits.
- the driving process for each frame of pixel data can be divided into a first charging phase, a second charging phase, and an illuminating phase; the method includes:
- a first data voltage is applied to the data voltage line and a first scan voltage is applied to the write control line to write the first data voltage to the first driver module:
- a second data voltage is applied to the data voltage line and a second scan voltage is applied to the write control line to write the second data voltage to the second driver module:
- a scan voltage is input in the drive control line to cause the drive module to drive the light-emitting module to emit light.
- the present invention also provides a display device including any of the above pixel circuits.
- one circuit in a pixel circuit, is used to drive two pixels, and two adjacent pixels share a plurality of signal lines, which can reduce the number of signal lines for a pixel circuit in a display device. Reduce the cost of integrated circuits, reduce pixel pitch, and increase pixel density.
- FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
- FIG. 2 is a schematic structural diagram of a data voltage writing module in a pixel circuit according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of a circuit of a pixel circuit according to a first embodiment of the present invention
- FIG. 4 is a timing diagram of key signals in a driving method of a pixel circuit according to a first embodiment of the present invention
- 5a-5c are schematic diagrams showing current flow directions and voltage values of pixel circuits in different timings in the first embodiment of the present invention
- FIG. 6 is a schematic structural diagram of a circuit of a pixel circuit according to a second embodiment of the present invention.
- FIG. 7 is a timing diagram of key signals in a driving method of a pixel circuit according to a second embodiment of the present invention.
- FIGS. 8a-8c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in a second embodiment of the present invention.
- FIG. 9 is a schematic structural diagram of a circuit of a pixel circuit according to a third embodiment of the present invention.
- FIG. 10 is a timing diagram of key signals in a driving method of a pixel circuit according to a third embodiment of the present invention.
- 11a-11d are schematic diagrams showing current flow directions and voltage values of pixel circuits in different timings according to a third embodiment of the present invention.
- FIG. 12 is a schematic structural diagram of a circuit of a pixel circuit according to a fourth embodiment of the present invention.
- FIG. 13 is a timing diagram of key signals in a driving method of a pixel circuit according to a fourth embodiment of the present invention.
- 14a-14c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in a fourth embodiment of the present invention.
- FIG. 15 is a schematic diagram of a positional relationship between a pixel circuit and a pixel in a display device according to an embodiment of the present invention.
- 16 is a schematic diagram of a positional relationship between a pixel circuit and a pixel in a display device according to an embodiment of the present invention
- FIG. 17 is a schematic diagram showing a positional relationship between a pixel circuit and a pixel in a display device according to an embodiment of the present invention.
- FIG. 18 is a schematic diagram showing a positional relationship between a pixel circuit and a pixel in a display device according to an embodiment of the present invention.
- FIG. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention.
- the pixel circuit includes a data voltage writing module 100 and a first driving module 210, a second driving module 220, a first lighting module 310, and a second lighting module 320.
- the data voltage writing module 100 and the data voltage are The line Vdata, the write control line R are connected, and the two driving modules 210 and 220 are connected for writing the first data voltage in the data voltage line Vdata to the first driving module according to the input of the write control line R in the same frame.
- the second data voltage in the data voltage line Vdata is written into the second driving module 220;
- the first driving module 210 is connected to the first lighting module 310, and the second driving module 220 is connected to the second lighting module 320;
- Each of the driving modules is connected to the working voltage line Vdd and the driving control line S for driving the corresponding lighting module to emit light under the control of the driving control line S.
- one circuit is used to drive two pixels, and two adjacent pixels share a plurality of signal lines, which can reduce the number of signal lines for the pixel circuit in the display device, reduce the cost of the integrated circuit, and reduce the pixel pitch. , increase pixel density.
- the light emitting module 310 includes two electroluminescent elements, each of which is connected to a driving module.
- the electroluminescent device may be a plurality of current-driven light-emitting devices including a light-emitting diode (LED) or an organic light-emitting diode (OLED).
- LED light-emitting diode
- OLED organic light-emitting diode
- an OLED is taken as an example for description.
- each frame includes a first charging phase, a second charging phase, and a lighting phase;
- a first data voltage is applied to the data voltage line and a first scan voltage is applied to the write control line to write the first data voltage to the first driver module:
- a second data voltage is applied to the data voltage line and a second scan voltage is applied to the write control line to write the first data voltage to the second driver module:
- a scan voltage is input in the drive control line to cause the drive module to drive the light-emitting module to emit light.
- the data voltage writing module 100 includes a first sub-data voltage writing module 110 and a second sub-data voltage writing module 120, and write control
- the line R includes a first write control line R1 and a second write control line R2, and the first sub data voltage write module
- the first sub-data voltage writing module 120 is connected to the data voltage line Vdata, the first write control line R1, and the first driving module 210.
- the second sub-data voltage writing module 120 is connected to the data voltage line Vdata, the second write control line R2, and the second driving module 220.
- the first sub-data voltage writing module 110 may each include a write transistor T1.
- the gate of the write transistor T1 is connected to the first write control line R1, the source is connected to the data voltage line Vdata, and the drain is connected to the first driving module 210.
- the second sub-data voltage writing module 120 can include a write transistor. T1', and the gate of the write transistor T1' is connected to the second write control line R2, the source is connected to the data voltage line Vdata, and the drain is connected to the second drive module 220.
- the write transistor referred to in the present invention refers to a transistor for performing write control.
- the first driving module 210 includes a first driving transistor T2, a second driving transistor T3, a third driving transistor T4, and a storage capacitor C (for the second driving module 220, the first driving transistor and the second driving
- the transistor, the third driving transistor, and the storage capacitor are sequentially represented as T2', T3', T4', C') in the figure, wherein the source of the first driving transistor T2 is connected to the drain of the corresponding writing transistor T1, and the gate And the drain is connected to the gate of the second driving transistor T3; the drain of the second driving transistor T3 is connected to the source of the third driving transistor T4, the source is connected to the working voltage line Vdd; and the gate of the third driving transistor T4
- the pole is connected to the driving control line S, and the drain is connected to the OLED; the first end a of the
- the drive transistor referred to in the present invention refers to a transistor involved in the drive module.
- the operating current flowing through the electroluminescent unit is not affected by the threshold voltage of the corresponding driving transistor, and the problem of uneven display brightness due to the threshold voltage drift of the driving transistor is completely avoided.
- the two pixels only use three control lines, one working voltage line and one data voltage line, which greatly reduces the number of used signal lines. Thereby, the pixel density can be further increased.
- the pixel circuit provided by the first embodiment further includes a first reset transistor T5 and a second reset transistor T5'.
- the gate of the first reset transistor T5 is connected to the reset control line Reset.
- the source is connected to the first end of the storage capacitor C of the first driving module 210, the drain connection resets the low-level line Vint (or ground);
- the gate of the second reset transistor T5' is connected to the reset control line Reset,
- the source is connected to the first end of the storage capacitor C' of the second driving module 220, and the drain connection resets the low-level line Vint.
- the voltage input in the reset low-level line here can be a negative voltage or a zero voltage (equivalent to grounding the drain of the reset transistor).
- the reset transistor referred to in the present invention refers to a transistor for controlling reset of the driving module.
- the reset transistor By setting the reset transistor to reset the voltage of the capacitor in the driver module, the initialization of the driver module can be quickly and completely realized.
- each of the transistors (including the write transistor, the drive transistor, and the reset transistor) involved in the first embodiment of the present invention is a P-channel type thin film transistor TFT.
- T5 and T5' may be N-channel transistors
- T4 and T4' may be P-channel transistors.
- the technical solutions provided by the present application can be implemented as long as the on/off states of the two transistors connected to the same scanning signal line are the same.
- the alternative embodiments of the present invention are not to be construed as limiting the scope of the present invention. limited.
- FIG. 4 is a timing diagram of key signals in a driving method of a pixel circuit according to a first embodiment of the present invention.
- the driving process for each frame of pixel data can be divided into a first charging phase 2, a second charging phase 3, and a lighting phase 4.
- 5a-5c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in the first embodiment of the present invention. In each of the above stages 2-4, the current flow and voltage values of the pixel circuit are as shown in Figs. 5a, 5b, and 5c, respectively.
- a first data voltage V1 required for the OLED to emit light in the frame is applied in the data voltage line Vdata, and a low level is applied to the first write control line R1 to turn on T1 and T2 while
- the other control lines including the second write control line R2, the reset control line Reset, and the drive control line S
- Vdata charges capacitor C along T1 and T2.
- the voltage at point a is V1-Vth2 (the voltage difference between the two ends of the T2 gate source is Vth2, Where Vth2 is the threshold voltage of T2).
- the OLED 'the second data voltage V2 required for illuminating in the frame is applied in the data voltage line Vdata, and the low level is applied to the second write control line R2 to turn on T1' and T2'.
- a high level is applied to other control lines to turn off other TFTs.
- Vdata charges capacitor C' along T1' and T2'.
- the voltage at point b after charging is V2-Vth2' (the voltage difference between the two ends of the gate source is Vth2', where Vth2' is T2. 'Threshold voltage'.
- a low level is applied to the driving control line S to turn on T4 and T4'. Since the voltage on the operating voltage line Vdd is generally much larger than V1-Vth2 and V2-Vth2', T3 and T3 are also turned on. At the same time, a high level is applied to other control lines to turn off other TFTs. As shown in Fig. 5c, Vdd supplies power to the OLED along T3 and T4, respectively, and supplies power to the OLED' along T3' and T4' to cause the OLED and the OLED' to emit light.
- the current flowing through the OLED can be obtained as follows:
- Vth2 is the threshold voltage of T2
- I OLED K(Vdd-V1) 2 .
- the current flowing through the OLED' can be obtained as:
- I OLED' K(Vdd-V2) 2 .
- the operating current flowing through the two electroluminescent units at this time is not affected by the threshold voltage of the driving transistor, and is only related to the data voltage applied in the data voltage line Vdata at this time.
- the problem that the driving TFT is drifted by the threshold voltage (Vth) due to process fabrication and long-time operation is completely avoided, the influence of the current flowing through the electroluminescent unit is eliminated, and the normal operation of the electroluminescent unit is ensured.
- the method may further include:
- a low level signal is applied to the reset control line Reset, and other control lines apply a high level signal.
- all other TFTs are turned off.
- the a terminal of the capacitor C and the b terminal of the capacitor C' are connected to the reset low level, so that the a terminal of the capacitor C and the b terminal of the capacitor C' quickly reach a low level.
- FIG. 6 is a schematic structural diagram of a circuit of a pixel circuit according to a second embodiment of the present invention. As shown in FIG. 6, the structure of the two driving modules in the pixel circuit provided by the second embodiment is also the same. For convenience of description, the following description is also only made of the structure of the first driving module 210. As shown in FIG.
- the first driving module 210 includes a first driving transistor T2, a second driving transistor T3, a third driving transistor T4, a fourth driving transistor T5, and a storage capacitor C (for the second driving module 220, the first The driving transistor, the second driving transistor, the third driving transistor, the fourth driving transistor, and the storage capacitor are sequentially represented as T2′, T3′, T4′, T5′, C′) in the figure, wherein the first driving transistor T2 The gate is connected to the driving control line S, the source is connected to the working voltage line Vdd, the drain is connected to the source of the second driving transistor T3, and the gate of the second driving transistor T3 is connected to the first end a1 end of the storage capacitor C (for the capacitor C ', the first end is the a2 terminal), the drain is connected to the source of the third driving transistor T4; the third driving transistor gate T4 is connected to the driving control line S, the drain is connected to the OLED; and the drain of the fourth driving transistor T5 is connected a drain of the second driving transistor T3,
- the operating current flowing through the electroluminescent unit is not affected by the threshold voltage of the corresponding driving transistor, and the problem of uneven display brightness due to the threshold voltage drift of the driving transistor is completely avoided.
- the two pixels only use three control lines, one working voltage line and one data voltage line, which greatly reduces the number of used signal lines, thereby further increasing the pixel density.
- the pixel circuit may also include reset transistors T6 and T6', the gates of the reset transistors T6 and T6' are connected to the reset control line Reset, and the source of the reset transistor T6 is connected to the first end of the storage capacitor C.
- A1 the drain is connected to the second end b1 of the storage capacitor C; the source of the reset transistor T6' is connected to the first end a2 of the storage capacitor C', and the drain is connected to the second end b2 of the storage capacitor C'.
- the initialization of the driving module can also be implemented quickly and completely.
- the pixel circuit provided by the embodiment of the present invention further includes: a capacitive touch detection module 410 and a light sensing touch detection module 420.
- the capacitive touch detection module 410 includes a first touch transistor M1, a second touch transistor M2, a third touch transistor M3, a first sensing capacitance Cc, and a touch electrode d.
- the gate of the first touch transistor M1 is connected to the reset control line Reset,
- the source is connected to the data voltage line Vdata, the drain is connected to the first end a3 end of the first sensing capacitor Cc;
- the gate of the second touch transistor M2 is connected to the first end a3 end of the first sensing capacitor Cc, and the source is connected
- the second terminal b3 end of the sensing capacitor Cc is connected to the source of the third touch transistor M3;
- the gate of the third touch transistor M3 is connected to the first write control line R1, and the drain is connected to the touch signal reading line Y-
- the second terminal b3 of the first sensing capacitor Cc is also connected to the detection driving voltage line Vcom;
- the touch electrode d is connected to the gate of M2, and since the gate of M2 is also connected to one end of Cc, the touch electrode d Also connected to the capacitor Cc, the capacitor Cc functions to maintain the voltage of the touch electrode d.
- the touch detection module when the user performs a touch operation, the user's finger or other touch device forms an induced capacitance value with the touch electrode connected to the sensing capacitor, and the position of the sensing capacitor can be accurately measured. Achieve detection of touch locations.
- the light touch detection module 420 includes a fourth touch transistor M4, a fifth touch transistor M5, a sixth touch transistor M6, a seventh touch transistor M7, and a second sensing capacitance Cp.
- the gate of the fourth touch transistor M4 is connected to the second write control line R2, the source is connected to the data voltage line Vdata, the drain is connected to the first end a4 end of the second sensing capacitor Cp, and the gate and source of the fifth touch transistor M5 are connected.
- the pole is connected to the first end a4 end of the second sensing capacitor Cp, the drain is connected to the second end b4 end of the second sensing capacitor Cp; the gate of the sixth touch transistor M6 is connected to the driving control line S, and the source is connected to the second The second end b4 end of the sensing capacitor Cp is connected to the touch signal read line Y-read line; the gate of the seventh touch transistor M7 is connected to the reset control line Reset, and the source is connected to the second sensing capacitor Cp.
- One end a4 end, the drain is grounded; wherein the fifth touch transistor M5 is a photo sensor transistor.
- the sense driving voltage line here refers to a voltage line for supplying a driving pulse.
- the phototransistor here produces different photocurrents at different illumination intensities.
- the circuit for touch detection and the circuit for pixel compensation share the control line and the data voltage line, which can further reduce the number of signal lines used by the touch detection circuit and the pixel compensation circuit, and improve the pixel density. .
- the transistors other than the fifth touch transistor are all P-channel thin film transistor TFTs.
- the fifth touch transistor is an N-channel type TFT.
- FIG. 7 is a timing diagram of key signals in a driving method of a pixel circuit according to a second embodiment of the present invention.
- the driving process for each frame of pixel data can be divided into first Charging phase 2, second charging phase 3, and lighting phase 4.
- 8a-8c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in a second embodiment of the present invention. In each of the above stages 2-4, the current flow direction and voltage value of the pixel circuit are as shown in Figs. 8a, 8b, and 8c, respectively.
- a low level is applied to R1
- the other control lines apply a high level
- a first data voltage V1 is applied to the data voltage line Vdata (where V1 refers to the voltage corresponding to the OLED lighting).
- V2 refers to the voltage corresponding to the OLED 'luminescence.
- T1, T3, and T5 are turned on, other TFTs are turned off, and signals on Vdata are started by T1 ⁇ T3 ⁇ T5.
- the capacitive touch detection module referring to Fig. 8a, M1 is turned off, M2 and M3 are turned on, and at this time, the coupled pulse signal (Vint) provides the potential of one end of Cc on the one hand, forming a coupling capacitance, and acting as M2 on the other hand.
- M2 is equivalent to the source of the amplifying TFT
- the touch of the finger directly causes the gate potential of M2 to decrease (assuming Vf is lowered).
- the gate-source voltage of M2 satisfies the MOSFET continuity condition, the signal passes through M2.
- the touch detection module buffer phase that is, "waiting" for the M2 gate potential to decrease, the main cause of the decrease is the touch of the finger.
- each of the transistors in the photo-sensing touch detection module is turned off, and the photo-sensing touch detection module is in a non-operating state.
- the Y-Read Line collects signals in the Y direction.
- R1 also has an acquisition function as a horizontal (X-direction) scan signal (because the signal in the Y direction can be acquired only when R1 is at a low level, and R1 is a low-level signal in a specific pixel at a specific time, This makes it possible to determine the X coordinate based on the time at which the Y-direction signal is acquired. This determines the X, Y coordinates of the finger touch position. In this process, as long as the finger participates in the touch, the coordinate position can be collected at any time.
- the write control line R1 functions as a touch signal read line X-read line in the X direction (the X direction corresponds to the scan direction).
- a low level is applied to R2, the other control lines apply a high level, and a second data voltage V2 is applied to the data voltage line Vdata.
- T1', T3', and T5' are turned on, and the other TFTs are turned off.
- the signal on Vdata starts to charge a2 point through T1' ⁇ T3' ⁇ T5', and always charges a2 point to V2–Vth3' (the voltage difference between the two poles of the gate source is satisfied) Vth3', where Vth3' is the threshold voltage of T3').
- each transistor in the capacitive touch detection module is completely disconnected, and the capacitive touch detection module is in an inoperative state.
- the gate source of M5 is connected, M7 is turned off, M4 is turned on, and the output coupling voltage is V2.
- the potential difference stored by Cp is a fixed value.
- the photo transistor M5 receives As the light intensity increases and the charging current increases, the voltage is temporarily stored at both ends of Cp, waiting for the next stage of the reading process.
- a low-level signal is applied to the drive control line S, and other control lines apply a high-level signal.
- T2, T2', T4, and T4' are both guided.
- Vdd supplies power to the OLED and the OLED' along T2, T4 and T2', T4', respectively, so that the two organic light emitting diodes emit light.
- the current flowing through the OLED can be obtained as follows:
- the current flowing through the OLED' can be obtained as:
- I OLED' K(Vdd-V2) 2 .
- the operating current flowing through the two electroluminescent units at this time is not affected by the threshold voltage of the driving transistor, and is only related to the data voltage applied in the data voltage line Vdata at this time.
- the problem that the driving TFT is drifted by the threshold voltage (Vth) due to process fabrication and long-time operation is completely avoided, the influence of the current flowing through the electroluminescent unit is eliminated, and the normal operation of the electroluminescent unit is ensured.
- M6 is turned on, and other TFTs are turned off.
- the current stored in the capacitor Cp is output to the Y-read line via M6. If a touch action occurs during this period, the difference between the change in the intensity of the photoelectric signal before and after the touch is compared with the non-touch threshold, and accordingly, Have Touch (change in light illumination intensity), at this point, the X-direction coordinate is determined by the S-output point at this time, and the Y-direction coordinate is still determined by the Y-Read Line. At this time, the second time using the Read Line for touch signal acquisition.
- each transistor in the capacitive touch detection module is completely disconnected, and the capacitive touch detection module is in an inoperative state.
- a reset phase 1 as shown in FIG. 7 may be further included.
- a low level is applied to the Reset line, and other control lines apply a high level to make T6, T6', and M7. Turn on, and set the first terminal voltage of capacitor C, capacitor C', and capacitor Cp to 0. In this way, it is ensured that the voltage in the capacitor is quickly set to zero to avoid interference with subsequent illumination or touch detection.
- the order of the first charging phase 2 and the second charging phase 3 may be interchanged, and the reverse of the order of the two charging phases does not affect the implementation of the present invention.
- FIG. 9 is a schematic structural diagram of a circuit of a pixel circuit according to a third embodiment of the present invention.
- the structure of the two driving modules in the pixel circuit provided by the third embodiment is also the same.
- the first driving module 210 For convenience of description, only the structure of the first driving module 210 will be described below.
- each of the driving modules includes a first driving transistor T2, a second driving transistor T3, a third driving transistor T4, a fourth driving transistor T5, and a storage capacitor C (for the second driving module 220, the first thereof
- the drive transistor, the second drive transistor, the third drive transistor, the fourth drive transistor, and the storage capacitor are sequentially represented as T2', T3', T4', T5', C') in the figure.
- the gate of the first driving transistor T2 is connected to the first driving control line S1, the source is connected to the drains of the second driving transistor T2 and the third driving transistor T3, and the drain is connected to the working voltage line Vdd; the gate of the second driving transistor T3 Connected to the second driving control line S2, the source is connected to the first end a of the storage capacitor C (for C', the first end thereof is represented as the b end shown in the figure); the gate connection storage of the third driving transistor T4
- the first end of the capacitor C is connected to the OLED; the gate and the drain of the fourth driving transistor T5 are connected to the first end a of the storage capacitor C, the source is connected to the corresponding write transistor T1;
- the two ends are connected to a low level line.
- the voltage in the low-level line here may be a low level where the voltage is not 0, or 0 (ie, the ground line GND).
- each of the transistors (including the write transistor and the drive transistor) in the third embodiment of the present invention is an N-channel type thin film transistor TFT.
- FIG. 10 is a timing diagram of key signals in a driving method of a pixel circuit according to a third embodiment of the present invention.
- the driving process for each frame of pixel data can be divided into a reset phase 1, a first charging phase 2, a second charging phase 3, and a lighting phase 4.
- 11a-11d are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in a third embodiment of the present invention. In each of the above stages 1-4, the current flow direction and voltage values of the pixel circuits are as shown in Figs. 11a, 11b, 11c, and 11d, respectively.
- a high level signal is applied to the first driving control line S1 and the second driving control line S2, and low is applied to both the first write control line R1 and the second write control line R2.
- the level signal turns on T2, T3, T2', and T3', and the other TFTs are turned off.
- the working voltage line Vdd is charged to the a terminal of the capacitor C along T2 and T3, and is charged to the b terminal of the capacitor C' along T2' and T3'. After the end of charging, the a terminal potential and the b terminal are terminated.
- the potential is the same as the voltage in Vdd, which is Vdd.
- the first data voltage V1 required for the OLED to emit light in the frame is applied in the data voltage line Vdata, applied to the first driving control line S1 and the second driving control line S2.
- the low level signal causes T2, T3, T2', T3' to be turned off, and a high level is applied to the first write control line R1 to turn on T1.
- the source voltage of T5 becomes V1
- since the gate voltage of T5 is a higher voltage Vdd T5 is turned on, and the capacitor C is discharged to the data voltage line Vdata until the gate of T5.
- the voltage drops to V1 + Vth5 (the threshold voltage Vth5 that maintains the voltage difference across the gate and source is T5). This process is equivalent to recharging the a terminal of capacitor C.
- a second data voltage V2 required for OLED 'luminescence within the frame is applied in the data voltage line Vdata, at the first driving control line S1 and the second driving control line S2.
- a low level signal is applied to turn off T2, T3, T2', T3', and a high level is applied to the second write control line R2 to turn on T1'.
- the source voltage of T5' becomes V2. Since the gate voltage of T5' is a higher voltage Vdd, T5' is turned on, and the capacitor C' is discharged to the data voltage line Vdata until T5. 'The gate voltage drops to V2+Vth5' (the threshold voltage Vth5' that maintains the voltage difference across the gate and source is T5'). This process is equivalent to recharging the b-end of capacitor C'.
- a high level signal is applied to the first drive control line S1
- a low level signal is applied to the other control lines, at which time T2 and T2' are turned on, and additionally due to a point and b
- the potential of the point is higher, T4 and T4' are also turned on, and Vdd supplies current to the OLED along T2 and T4, so that the OLED emits light, and supplies current to the OLED' along T2' and T4', so that the OLED 'illuminates.
- the current flowing through the OLED can be obtained as follows:
- I OLED K(V1-V OLED ) 2 .
- the current flowing through the OLED' can be obtained as:
- I OLED' K(V2-V OLED' ) 2 .
- the operating current flowing through the two electroluminescent units at this time is not affected by the threshold voltage of the driving transistor, and is only related to the data voltage applied in the data voltage line Vdata at this time.
- the problem that the driving TFT is drifted by the threshold voltage (Vth) due to process fabrication and long-time operation is completely avoided, the influence of the current flowing through the electroluminescent unit is eliminated, and the normal operation of the electroluminescent unit is ensured.
- FIG. 12 is a schematic diagram showing the circuit structure of a pixel circuit according to a fourth embodiment of the present invention.
- the data voltage writing module includes three write transistors, wherein the gate of the first write transistor T1 is connected to the first write control line R1.
- the source is connected to the data voltage line Vdata, the drain is connected to the source of the second write transistor T2; the gate of the second write transistor T2 is connected to the drains of the first driver module 210 and the third write transistor T3, and the drain is connected to the third write
- the first driving module 210 includes two driving transistors T4 and T5 and a storage capacitor C (for the second driving module 210, the two driving transistors are represented as T4' and T5' in FIG. 12, and the capacitance is represented. For C').
- the source of the first driving transistor T4 is connected to the working voltage line Vdd, the drain is connected to the source of the second driving transistor T5; the gate of the second driving transistor T5 is connected to the driving control line S, and the source is connected to the first driving transistor T4. Drain, drain connected to OLED; storage capacitor C connected at Between the gate and the source of a driving transistor T4;
- the gate of the first driving transistor T4 of the first driving module 210 is connected to the gate of the second writing transistor T2, and the gate of the first driving transistor T4' of the second driving module 220 is connected to the drain of the second writing transistor T2.
- the operating current flowing through the electroluminescent unit is not affected by the threshold voltage of the corresponding driving transistor, and the problem of uneven display brightness due to the threshold voltage drift of the driving transistor is completely avoided.
- the two pixels only use three control lines, one working voltage line and one data voltage line, which greatly reduces the number of used signal lines, thereby further increasing the pixel density.
- the pixel circuit may further include a reset transistor T6, the gate of the reset transistor T6 is connected to the reset control line Reset, the source is connected to the drain of the second write transistor T2, and the drain is connected to the reset low-level line Vint.
- each transistor is a P-channel transistor.
- FIG. 13 is a timing diagram of key signals in a driving method of a pixel circuit according to a fourth embodiment of the present invention.
- the driving process for each frame of pixel data can be divided into a first charging phase 2, a second charging phase 3, and a lighting phase 4.
- 14a-14c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings in a fourth embodiment of the present invention. In each of the above stages 2-4, the current flow direction and voltage values of the pixel circuits are as shown in Figs. 14a, 14b, and 14c, respectively.
- a first data voltage V1 required for OLED illumination is applied in the data voltage line Vdata, and a low level is applied to the first write control line R1 and the second write control line R2, The other control lines are applied with a high level.
- T1 and T3 are turned on, and T2 is turned on as the driving TFT.
- Vdata is charged to the a terminal of the capacitor C along T1, T2, and T3, and the point a is always charged. Until V1-Vth2 (Vth2 is the threshold voltage of T2).
- the first data voltage V2 required for OLED 'illumination is applied in the data voltage line Vdata, a low level is applied to the first write control line R1, and other control lines apply high voltage.
- T1 and T2 are turned on.
- Vdata charges the b terminal of the capacitor C' along T1 and T2, and charges b to V2-Vth2.
- the current flowing through the OLED can be obtained as follows:
- I OLED K(V dd -V1) 2 . same,
- I OLED' K(V dd - V2) 2 .
- the operating current flowing through the two electroluminescent units at this time is not affected by the threshold voltage of the driving transistor, and is only related to the data voltage applied in the data voltage line Vdata at this time.
- the problem that the driving TFT is drifted by the threshold voltage (Vth) due to process fabrication and long-time operation is completely avoided, the influence of the current flowing through the electroluminescent unit is eliminated, and the normal operation of the electroluminescent unit is ensured.
- a reset phase 1 as shown in FIG. 13 may be further included, at which time a low level is applied to the Reset control line and the second line control line R2, and T6 and T3 are turned on. , respectively, the a terminal of the capacitor C and the b terminal voltage of the capacitor C' are set to 0. In this way, it is ensured that the voltage in the capacitor is quickly set to zero to avoid interference with subsequent illumination or touch detection.
- the present invention also provides a display device including any of the above pixel circuits.
- 15-18 are schematic diagrams showing a positional relationship between a pixel circuit and a pixel in a display device according to an embodiment of the present invention.
- one pixel circuit corresponds to two pixels.
- the above pixel circuit (PU described in the figure) may be located on the same side of the shared data voltage line, or as shown in FIG.
- the above-described pixel circuits PU are located on both sides of a common data voltage line.
- the pixel area of each pixel includes a light emitting module and a driving module.
- each pixel corresponds to one sub data voltage writing module. This enables the distribution of components on the corresponding substrate to be more uniform.
- the two pixels corresponding to the pixel circuit each include a touch detection unit.
- the pixel circuit provided by the second embodiment further includes a capacitive touch detection module and a light sensing touch detection module
- the capacitive touch detection module C is located in a pixel area of one of the pixels
- the light sensing touch detection module P is located in the pixel area of another pixel.
- the two touch detection units may be located on both sides of the signal read line Read line as shown in FIG. 17, or located in the signal reading as shown in FIG. Take the same side of the Read line.
- the pixel circuit provided by the second embodiment further includes a capacitive touch detection module and a light sensing touch detection module, as shown in FIG. 17 or 18, the pixel circuit is periodically distributed.
- a general pixel circuit can be arranged. In this way, it is possible to avoid setting a touch detection unit in each pixel, which reduces the manufacturing complexity and cost.
- the display device can be any product or component having display function such as electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator, and the like.
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Abstract
Description
Claims (17)
- 一种像素电路,包括:数据电压写模块和两个驱动模块、两个发光模块;其中,数据电压写模块与数据电压线、写控制线以及两个驱动模块相连,用于在同一帧内,根据写控制线的输入先将数据电压线中的第一数据电压写入第一驱动模块,再将数据电压线中的第二数据电压写入第二驱动模块;第一驱动模块与第一发光模块相连,第二驱动模块与第二发光模块相连;且两个驱动模块均与工作电压线、驱动控制线相连,用于在驱动控制线的控制下驱动对应的发光模块发光。
- 如权利要求1所述的像素电路,其中,所述数据电压写模块包括第一子数据电压写模块和第二子数据电压写模块,所述第一子数据电压写模块与数据电压线、第一写控制线以及第一驱动模块相连,所述第二子数据电压写模块与数据电压线、第二写控制线以及第二驱动模块相连。
- 如权利要求2所述的像素电路,其中,每一个子数据电压写模块包括一个写晶体管,所述写晶体管的栅极连接到对应的写控制线,源极连接数据电压线,漏极连接对应的驱动模块。
- 如权利要求3所述的像素电路,其中,每一个驱动模块包括三个驱动晶体管和一个存储电容,其中,第一驱动晶体管的源极连接对应的写晶体管的漏极,栅极和漏极均与第二驱动晶体管的栅极相连;第二驱动晶体管的漏极与第三驱动晶体管的源极相连,源极与数据电压线相连;第三驱动晶体管的栅极与驱动控制线相连,漏极与发光模块相连;所述存储电容的第一端连接所述第二驱动晶体管的栅极,第二端连接所述第二驱动晶体管的源极。
- 如权利要求4所述的像素电路,其中,还包括第一重置晶体管和第二重置晶体管,第一重置晶体管的栅极连接重置控制线,源极连接第一驱动模块的存储电容的第一端,漏极连接重置低电平线;第二重置晶体管的栅极连接重置控制线,源极连接第二驱动模块的存储电容的第一端,漏极连接重置低电平线。
- 如权利要求3所述的像素电路,其中,每一个驱动模块包括四个驱动晶体管和一个存储电容;其中,第一驱动晶体管的栅极连接驱动控制线,源极连接工作电压线,漏极连接第二驱动晶体管的源极;第二驱动晶体管的栅 极连接存储电容的第一端,漏极连接第三驱动晶体管的源极;第三驱动晶体管栅极连接驱动控制线,漏极连接发光模块;第四驱动晶体管的漏极连接第二驱动晶体管的漏极,源极连接存储电容的第一端;存储电容的第二端接地;第一驱动模块的第四驱动晶体管栅极连接第一写控制线,第二驱动模块的第四驱动晶体管栅极连接第二写控制线。
- 如权利要求6所述的像素电路,其中,还包括第一重置晶体管和第二重置晶体管,两个重置晶体管的栅极均连接重置控制线;第一重置晶体管的源极连接第一驱动模块的存储电容的第一端,漏极连接第一驱动模块的存储电容的第二端;第二重置晶体管的源极连接第二驱动模块的存储电容的第一端,漏极连接第二驱动模块的存储电容的第二端。
- 如权利要求7所述的像素电路,其中,还包括一个电容式触摸检测模块和一个光感式触摸检测模块;所述电容式触摸检测模块包括第一触摸晶体管、第二触摸晶体管、第三触摸晶体管、第一感测电容以及触摸电极,第一触摸晶体管的栅极连接重置控制线,源极连接数据电压线,漏极连接第一感测电容的第一端;第二触摸晶体管的栅极连接第一感测电容的第一端,源极连接第一感测电容的第二端,漏极连接第三触摸晶体管的源极;第三触摸晶体管的栅极连接第一写控制线,漏极连接触摸信号读取线;第一感测电容的第二端还连接检测驱动电压线;触摸电极与第二触摸晶体管的栅极相连;所述光感式触摸检测模块包括第四触摸晶体管、第五触摸晶体管、第六触摸晶体管,第七触摸晶体管和第二感测电容,第四触摸晶体管的栅极连接第二写控制线,源极连接数据电压线,漏极连接第二感测电容的第一端;第五触摸晶体管的栅极和漏极连接第二感测电容的第一端,源极连接第二感测电容的第二端;第六触摸晶体管的栅极连接驱动控制线,源极连接第二感测电容的第二端,漏极连接触摸信号读取线;第七触摸晶体管的栅极连接重置控制线,源极连接第二感测电容的第一端,漏极接地;其中,所述第五触摸晶体管为感光晶体管。
- 如权利要求1所述的像素电路,其中,所述数据电压写模块包括三个写晶体管,其中,第一写晶体管的栅极连接第一写控制线,源极连接数据电压线,漏极连接第二写晶体管的源极;第二写晶体管的栅极连接第一驱动模 块和第三写晶体管的漏极,漏极连接第三写晶体管的源极以及第二驱动模块;第三写晶体管的栅极连接第二写控制线。
- 如权利要求9所述的像素电路,其中,每一个驱动模块包括两个驱动晶体管和一个存储电容,其中,第一驱动晶体管的源极连接工作电压线,漏极连接第二驱动晶体管的源极;第二驱动晶体管栅极连接驱动控制线,源极连接第一驱动晶体管的漏极,漏极连接发光模块;存储电容连接在第一驱动晶体管的栅极和源极之间;第一驱动模块的第一驱动晶体管的栅极连接第二写晶体管的栅极,第二驱动模块的第一驱动晶体管的栅极连接第二写晶体管的漏极。
- 如权利要求10所述的像素电路,其中,还包括重置晶体管,重置晶体管的栅极连接重置控制线,源极连接第二写晶体管的漏极,漏极连接重置低电平线。
- 如权利要求3-7、9-11任一项所述的像素电路,其中,各个晶体管均为P沟道型薄膜晶体管。
- 如权利要求8所述的像素电路,其中,各个晶体管中除第五触摸晶体管以外的其他晶体管均为P沟道型薄膜晶体管,第五触摸晶体管为N沟道型薄膜晶体管。
- 如权利要求3所述的像素电路,其中,每一个驱动模块包括四个驱动晶体管和一个存储电容,第一驱动晶体管的栅极连接第一驱动控制线,源极连接第二驱动晶体管和第三驱动晶体管的漏极,漏极连接工作电压线;第二驱动晶体管的栅极连接第二驱动控制线,源极连接存储电容的第一端;第三驱动晶体管的栅极连接存储电容的第一端,源极连接发光模块;第四驱动晶体管的栅极和漏极连接存储电容的第一端,源极连接对应的写晶体管;所述存储电容的第二端连接低电平线。
- 如权利要求14所述的像素电路,其中,各个晶体管均为N沟道型薄膜晶体管TFT。
- 一种用于驱动如权利要求1-15中任一项所述的像素电路的方法,对每一帧像素数据的驱动过程包括第一充电阶段、第二充电阶段、发光阶段;该方法包括:在第一充电阶段,在数据电压线施加第一数据电压,并在写控制线施加 第一扫描电压将所述第一数据电压写入第一驱动模块:在第二充电阶段,在数据电压线施加第二数据电压,并在写控制线施加第二扫描电压将所述第二数据电压写入第二驱动模块:在发光阶段,在驱动控制线中输入扫描电压使驱动模块驱动发光模块发光。
- 一种包括如权利要求1-15任一项所述的像素电路的显示装置。
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