WO2015196598A1 - 像素电路、显示面板及显示装置 - Google Patents

像素电路、显示面板及显示装置 Download PDF

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Publication number
WO2015196598A1
WO2015196598A1 PCT/CN2014/087052 CN2014087052W WO2015196598A1 WO 2015196598 A1 WO2015196598 A1 WO 2015196598A1 CN 2014087052 W CN2014087052 W CN 2014087052W WO 2015196598 A1 WO2015196598 A1 WO 2015196598A1
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Prior art keywords
unit
pixel
module
touch
pixel circuit
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PCT/CN2014/087052
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English (en)
French (fr)
Inventor
杨盛际
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Priority to EP14859320.5A priority Critical patent/EP3163559B1/en
Priority to US14/435,810 priority patent/US9778800B2/en
Publication of WO2015196598A1 publication Critical patent/WO2015196598A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • G09G2300/0866—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes by means of changes in the pixel supply voltage
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements

Definitions

  • the present disclosure relates to a pixel circuit, a display panel, and a display device.
  • the existing display device with touch function can be generally divided into an on-cell touch panel and an in-cell touch panel.
  • the in-cell touch panel has a thinner thickness and a higher light transmittance than a surface touch panel.
  • an Organic Light Emitting Diode is a current-type light-emitting device because of its self-luminous, fast response, wide viewing angle, and can be fabricated on a flexible substrate. More and more features are increasingly used in high-performance display.
  • the OLED display device can be divided into passive matrix driving organic light emitting diode (Passive Matrix Driving OLED, PMOLED for short) and active matrix driving organic light emitting diode (AMOLED) according to different driving modes, due to AMOLED display.
  • Passive Matrix Driving OLED PMOLED for short
  • AMOLED active matrix driving organic light emitting diode
  • each OLED relies on a pixel driving circuit composed of a plurality of thin film transistor (TFT) switches in one pixel unit on the array substrate to drive the light to realize display.
  • TFT thin film transistor
  • the pixel driving circuit directly determines the quality of the OLED light emitting display, so the design of the pixel driving circuit is the core technical content of the AMOLED.
  • 1 is a schematic diagram of a circuit structure of a general pixel driving circuit. As shown in FIG.
  • the pixel driving circuit includes a switching thin film transistor T1, a driving thin film transistor T2, and a storage capacitor C, where T1 and T2 are both P-channel type driving thin film transistor, wherein the gate of T1 is connected to scan line Scan[1], the source is connected to data voltage line Data, the drain is connected to B end of C; the end of C is connected to the drain of T2; The B terminal is also connected to the gate of T2, the source of T2 is connected to the working voltage Vdd, and the drain is connected to the corresponding OLED; when the scanning circuit of Scan[1] is low, the control T1 is turned on, and the data voltage is Vdd.
  • T1 and T2 are both P-channel type driving thin film transistor, wherein the gate of T1 is connected to scan line Scan[1], the source is connected to data voltage line Data, the drain is connected to B end of C; the end of C is connected to the drain of T2; The B terminal is also connected to the gate of T2, the source of T2 is connected to the
  • the threshold voltage Vth of the driving TFT of each pixel point shifts, that is, the threshold voltage of the driving thin film transistor of each pixel point has unevenness due to the process process and device aging. It is easy to cause the current of the OLED flowing through each pixel to change due to the change of V th , so that the display brightness of the display screen is uneven, thereby affecting the display effect of the entire image.
  • a touch screen panel is a sensor and a driving circuit to be used for touch, and is also fabricated in each pixel unit on the array substrate by an array process. If the sensor and the driving circuit of the TSP are superimposed on the AMOLED pixel unit, a certain number of driving circuit TFTs need to be added, so that an additional space of a certain pixel unit is required, and the pixel unit has a limited space, which greatly limits the in-line.
  • the touch panel circuit is fabricated simultaneously with the AMOLED driver circuit.
  • At least one embodiment of the present invention provides a pixel circuit and a display device to avoid the influence of the threshold drift of the driving transistor on the display effect and improve the integration degree of the in-cell touch panel circuit and the pixel driving circuit.
  • At least one embodiment of the present invention provides a pixel circuit including: a pixel compensation module, a light emitting module, and a touch detection module;
  • the pixel compensation module includes first to fifth switching units, a pixel driving unit, and an energy storage unit; wherein
  • the control ends of the first switch unit and the fifth switch unit are both connected to the first scan signal line; the first end of the first switch unit is connected to the working voltage, and the second end of the first switch unit is connected to the input end of the pixel drive unit; The first end of the switch unit is connected to the output end of the pixel driving unit, and the second end is connected to the light emitting module;
  • the control ends of the second switch unit and the fourth switch unit are both connected to the second scan signal line;
  • the first end of the off unit is connected to the input end of the pixel driving unit, the second end of the second switch unit is connected to the second end of the energy storage unit and the control end of the pixel driving unit; the first end of the fourth switching unit is connected to the pixel driving unit
  • the output end of the fourth switch unit is connected to the data voltage line;
  • the control end of the third switch unit is connected to the third scan signal line, the first end of the third switch unit is connected to the second end of the energy storage unit, and the second end of the third switch unit is connected to the low level line;
  • the touch detection module includes a detection sub-module and an output sub-module; wherein the detection sub-module is respectively connected to the third scan signal line, the second working voltage, and the data voltage line for detecting the touch signal; and the output sub-module respectively The second scan signal line, the touch signal read line, and the detection sub-module are connected to output the touch detection signal to the touch signal read line according to the input of the second scan signal line.
  • the light emitting module comprises an electroluminescent element, the anode of the electroluminescent element being connected to the second end of the fifth switching unit.
  • the energy storage unit is a capacitor.
  • the output sub-module includes a sixth switch unit, the first end of the sixth switch unit is connected to the touch signal read line, and the second end is connected to the detection sub-module.
  • the detecting sub-module includes a seventh switching unit, a touch signal driving unit, a sensing capacitor and a touch electrode, wherein the first end of the seventh switching unit is connected to the data voltage line, and the second end is connected a control end of the touch signal driving unit, the control end is connected to the third scan signal line; the input end of the touch signal driving unit is connected to the second working voltage, and the output end is connected to the sixth switch unit; the sensing capacitor is connected at the The input end of the touch signal driving unit is connected to the control end; and the touch electrode is connected to the control end of the touch signal driving unit.
  • each of the switching unit and the driving unit is a thin film transistor.
  • each of the thin film transistors is a P-channel type; the control terminal of the driving unit is a gate of the thin film transistor, the input terminal is a source, and the output terminal is a drain; the control terminal of each switching unit is a gate of the thin film transistor The first end and the second end correspond to the source and the drain, respectively.
  • the present invention also provides a display panel including the above pixel circuit.
  • the pixel circuits are periodically distributed in the display panel.
  • the present invention also provides a display device including the above display panel.
  • a pixel compensation module and a touch detection module are integrated, and the pixel compensation module and the touch detection module share a data voltage line and a scan signal line. This will reduce The number of signal lines, which greatly reduces the pixel pitch size and reduces the cost of the IC, resulting in higher pixel density. Meanwhile, in the pixel circuit provided by the present invention, the operating current flowing through the electroluminescent unit is not affected by the threshold voltage of the corresponding driving transistor, and display luminance unevenness due to the threshold voltage drift of the driving transistor can be avoided.
  • 1 is a circuit configuration diagram of a general pixel driving circuit
  • FIG. 2 is a schematic structural diagram of a circuit of a pixel circuit according to an embodiment of the present invention.
  • FIG. 3 is a timing diagram of key signals in a driving method of a pixel circuit according to an embodiment of the present invention.
  • 4a-c are schematic diagrams showing current flow directions and voltage values of pixel circuits at different timings according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a potential change of a pixel electrode in a pixel circuit according to the present invention.
  • FIG. 6 is a schematic diagram of a positional relationship between a pixel circuit and a pixel in a display panel according to an embodiment of the present invention.
  • the pixel circuit includes:
  • a pixel compensation module 100 a light emitting module 200, and a touch detection module;
  • the pixel compensation module 100 includes a first switching unit T1, a second switching unit T2, a third switching unit T3, a fourth switching unit T4, a fifth switching unit T5, a pixel driving unit DT1, and an energy storage unit C1.
  • the first end of the switching unit T1 is connected to the working voltage Vdd, the second end is connected to the input end of the pixel driving unit DT1, the first end of the fifth switching unit T5 is connected to the output end of the pixel driving unit DT1, and the second end is connected to the light emitting module;
  • the control ends of the first switch unit T1 and the fifth switch unit T5 are connected to the first scan signal line Em, and the control end of the pixel drive unit DT1 is connected to the second end b end of the energy storage unit C1;
  • the first end of the second switching unit T2 is connected to the input end of the pixel driving unit DT1, and the second end is connected Connected to the second end b end of the energy storage unit C1, the control end is connected to the second scan signal line Scan[1];
  • the first end of the third switching unit T3 is connected to the second end b of the energy storage unit C1, the second end is connected to the low level Vcom, and the control end is connected to the third scanning signal line Scan[2];
  • the first end of the fourth switching unit T4 is connected to the output end of the pixel driving unit DT1, the second end is connected to the data voltage line Data, and the control end is connected to the second scanning signal line Scan[1];
  • the first end a of the energy storage unit C1 is connected to the working voltage Vdd;
  • the touch detection module includes a detection sub-module 310 and an output sub-module 320.
  • the detection sub-module 310 is connected to the third scan signal line Scan[2], the second working voltage Vint, and the data voltage line Data, respectively, for detecting the touch signal.
  • the output sub-module is respectively connected to the second scan signal line Scan[1], the touch signal read line Y-read line, and the detection sub-module 310 for inputting the touch according to the input of the second scan signal line Scan[1]
  • the control signal reading line Y-read line outputs a touch detection signal.
  • a pixel compensation module and a touch detection module are integrated, and the pixel compensation module and the touch detection module share a data voltage and a scan signal line. This reduces the number of signal lines, thereby significantly reducing the pixel pitch and reducing the cost of the IC, resulting in higher pixel density.
  • 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 solved.
  • the second operating voltage Vint here is used to provide the driving pulse required to detect the touch.
  • the lighting module 200 can include an electroluminescent element with an anode connected to the second end of the T5.
  • the electroluminescent device may be a plurality of devices having electroluminescence functions, 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.
  • the energy storage unit C1 is a capacitor.
  • other components with energy storage functions can be used according to design requirements.
  • the output sub-module 320 includes: a sixth switch unit T6, the first end of the sixth switch unit T6 is connected to the touch signal read line Y-read Line, and the second end is connected to the detection sub-module 310.
  • the control terminal is connected to the second scanning signal line Scan[1].
  • the detecting submodule 310 includes a seventh switching unit T7 and a touch signal driving unit. DT2, sensing capacitor C2 and touch electrode d, the first end of the seventh switch unit T7 is connected to the data voltage line Data, the second end is connected to the control end of the touch signal driving unit DT2, and the control end of the seventh switch unit is connected
  • the scanning signal driving unit DT2 is connected to the second working voltage Vint, the output terminal is connected to the sixth switching unit T6, and the sensing capacitor C2 is connected to the input end of the touch signal driving unit DT2.
  • the control electrode is connected to the control terminal of the DT2. Since one end of the C2 is also connected to the control terminal of the DT2, one end of the control terminal of the C2 connection DT2 is also connected to the touch electrode d.
  • each of the switching units and the driving unit is a thin film transistor TFT.
  • each of the thin film transistors is of a P-channel type.
  • the input end of the driving unit is the source of the TFT
  • the output end is the drain of the TFT
  • the control end is the gate of the TFT.
  • the control terminal is also the gate of the TFT, and the first end and the second end correspond to the source and the drain of the TFT, respectively.
  • the transistors corresponding to the driving unit and the switching unit herein may be transistors in which the source and the drain are interchangeable, or the first end of each of the switching units and the driving unit may be the drain of the transistor according to the type of conduction.
  • the second end is the source of the transistor, and the person skilled in the art can obtain the reverse connection of the source and the drain of each transistor in the pixel circuit provided by the present invention without any creative labor, and can obtain the invention provided by the present invention.
  • the circuit structures of the same or similar technical effects that can be achieved by the technical solutions are also within the scope of the present invention.
  • T1 and T5 may be N-channel transistors
  • T4 and T6 may be P-channel transistors, as long as they can
  • the technical solutions provided by the present application can be implemented by the same on/off state of the two switching units that connect the control terminals to the same scanning signal line.
  • the embodiments described in the present invention are not to be construed as limiting the scope of the present invention. .
  • FIG. 3 is a timing diagram of a possible scanning signal of each scanning signal line and a data voltage Vdata of a data voltage line in a frame during operation of the pixel circuit provided by the present invention, which can be divided into three stages, in FIG. 3 They are denoted as the first stage W1 (pixel compensation module reset and touch detection module reset stage), the second stage W2 (pixel compensation module charging and touch detection module detection stage), and the third Stage W3 (pixel compensation module illumination and touch detection module stagnation phase).
  • the first stage W1 pixel compensation module reset and touch detection module reset stage
  • the second stage W2 pixel compensation module charging and touch detection module detection stage
  • the third Stage W3 pixel compensation module illumination and touch detection module stagnation phase
  • FIGS. 4a-c are schematic diagrams showing current flow and voltage values of pixel circuits at different timings in an embodiment of the invention.
  • the current flow direction and voltage value of the pixel circuit are as shown in Figs. 4a, 4b, and 4c, respectively.
  • T7 is turned on, T6 and DT2 are turned off, and the touch detection module is reset.
  • the potential of the touch electrode d is equal to the voltage applied to the Data line at this time (for example, Vdata). ), and since the capacitor C2 is also connected to the touch electrode d, the potential of the touch electrode d is maintained at Vdata.
  • Scan[2] is equivalent to the reset scan signal line Reset line of the pixel compensation module 100 and the touch detection module.
  • FIG. 5 is a schematic diagram showing potential changes of a pixel electrode in a pixel circuit provided by the present invention.
  • the potential Vd of the touch electrode d is lowered (for example, Vf is lowered), thereby directly causing the DT2 gate potential to decrease to reach the guide of DT2. Passing the condition, at this time, Vint inputs an electric signal to the Y-read line via DT2 and T6.
  • Vd After the finger touch causes Vd to directly lower Vf, Vd continues to drop to 0 due to discharge of capacitor C2; and if there is no finger touch at this time, see In the solid line part, the potential Vd of the touch electrode d does not decrease, and remains at Vdata. At this time, DT2 is turned off, and an electric signal cannot be detected in the Y-read line.
  • the potential of the touch electrode d is directly lowered, and the condition of the DT2 conduction is reached.
  • the I&V characteristic curve is in the amplification region, and the DT2 acts as an amplification TFT to turn on and amplify the signal of the coupling pulse.
  • the signal in the Y direction is acquired by the Y-Read Line.
  • Scan[1] also has an acquisition function as an X-direction (row direction) scan signal (because the signal in the Y direction can be acquired only when Scan[1] is low, and in a specific row of pixels at a specific time.
  • Scan[1] is a low level signal, so that it can determine which line Scan[1] has scanned based on the moment of the acquired touch signal, thereby determining the coordinates of X). 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.
  • Scan[1] functions as an X-direction touch signal reading line X-read line.
  • the touch detection module In the touch detection module, all components do not work, and the touch detection module is in a stagnant state. This can reduce the impact on the display process.
  • the current flowing through the pixel driving unit DT1 can be obtained as follows:
  • the operating current IOLED is not affected by Vth at this time, and is only related to the difference between Vdd and Vdata.
  • Vth threshold voltage
  • the present invention also provides a display panel including the above pixel circuit.
  • the pixel circuits are periodically distributed in the display panel.
  • the pixel circuit provided by the embodiment of the present invention is not required to be used in the corresponding position of each pixel (for example, one pixel circuit provided by the embodiment of the present invention is disposed in three pixels, and an ordinary pixel circuit is disposed in other pixels. ), the detection of the touch signal can also be realized. As shown in Figure 6, for every three The pixel is provided with a pixel circuit (PU) provided by an embodiment of the present invention.
  • PU pixel circuit
  • the present invention also provides a display device including the above display panel.
  • the display device here can be: electronic paper, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator and the like with any display product or component.

Abstract

一种像素电路、显示面板和显示装置，该像素电路包括像素补偿模块、发光模块和触控检测模块；所述像素补偿模块包括第一至第五开关单元，像素驱动单元和储能单元；所述触控检测模块包括检测子模块和输出子模块，所述像素电路中，集成了像素补偿模块和触控检测模块，并使像素补偿模块和触控检测模块共用数据电压线和扫描信号线。这样就能减少信号线路的数目，从而大幅缩减像素间距大小并降低IC成本，从而获得更高的像素密度。同时所述像素电路中流经电致发光单元的工作电流不受对应的驱动晶体管的阈值电压的影响，能够避免由于驱动晶体管的阈值电压漂移导致显示亮度不均。

Description

像素电路、显示面板及显示装置 技术领域
本公开涉及一种像素电路、显示面板及显示装置。
背景技术
随着显示技术的急速进步，具有触控功能的显示装置由于其所具有的可视化操作等优点而逐渐受到越来越多人们的欢迎。根据触控面板与显示面板相对位置的不同，一般可以将现有的具有触控功能的显示装置分为表面式(on cell)触控面板与内嵌式(in cell)触控面板两种。与表面式触控面板相比，内嵌式触控面板具有更薄的厚度与更高的光透过率。
而对于现有的显示装置而言，有机发光二极管(Organic Light Emitting Diode，简称OLED)作为一种电流型发光器件，因其所具有的自发光、快速响应、宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显示领域当中。OLED显示装置按照驱动方式的不同可分为无源矩阵驱动有机发光二极管(Passive Matrix Driving OLED，简称PMOLED)和有源矩阵驱动有机发光二极管(Active Matrix Driving OLED，简称AMOLED)两种，由于AMOLED显示器具有低制造成本、高应答速度、省电、可用于便携式设备的直流驱动、工作温度范围大等等优点而可望成为取代液晶显示器(liquid crystal display，简称LCD)的下一代新型平面显示器。在现有的AMOLED显示面板中，每个OLED均依靠阵列基板上一个像素单元内的多个薄膜晶体管(Thin Film Transistor，简称TFT)开关所组成的像素驱动电路驱动发光实现显示。像素驱动电路直接决定了OLED发光显示的质量，因此像素驱动电路的设计是AMOLED的核心技术内容。图1为通常的一种像素驱动电路的电路结构示意图，如图1所示，该像素驱动电路包括一个开关薄膜晶体管T1和一个驱动薄膜晶体管T2、一个存储电容C，这里的T1和T2均为P沟道型驱动薄膜晶体管，其中T1的栅极与扫描线Scan[1]连接，源极连接数据电压线Data，漏极连接C的B端；C的A端连接T2的漏极；C的B端还连接T2的栅极，T2的源极连接工作电压Vdd，漏极连接对应的OLED；在Scan[1] 扫描到该行像素电路为低电平时，控制T1导通，将数据电压Vdd写入到C的B端；在该行扫描结束时，Scan[1]变为高电平，T1截止，存储在C上的数据电压驱动T2，使其产生电流来驱动OLED，保证OLED在一帧时间内持续发光，T2的饱和电流(即流过OLED的电流)IOLED＝K(VGS-Vth)2。其中K为关联于T2的电流常数；VGS为T2的栅极相对于源级的电压，Vth为T2的阈值电压。可见，IOLED与T2的阈值电压Vth有关。而且，由于工艺制程和器件老化等原因，在这种2T1C的像素驱动电路中，各像素点的驱动TFT的阈值电压Vth会漂移，即各像素点的驱动薄膜晶体管的阈值电压存在不均匀性，容易导致流过每个像素点的OLED的电流因Vth的变化而变化，使得显示屏的显示亮度不均，从而影响整个图像的显示效果。
另一方面，内嵌式触控面板(Touch Screen Panel，简称TSP)是将用于触摸的传感器及驱动电路，同样利用阵列工艺制作在阵列基板上的每个像素单元内。如果将TSP的传感器及驱动电路叠加在AMOLED像素单元中，则需要加入一定数量的驱动电路TFT，从而需要额外占用一定像素单元的空间，而像素单元中空余空间有限，这极大地限制了内嵌式触控面板电路与AMOLED驱动电路的同时制作。
发明内容
本发明的至少一个实施例提供一种像素电路及显示装置，以避免因驱动晶体管的阈值漂移对显示效果的影响并提高内嵌式触控面板电路与像素驱动电路的集成度。
本发明的至少一个实施例提供了一种像素电路，包括：像素补偿模块、发光模块和触控检测模块；
所述像素补偿模块包括第一至第五开关单元，像素驱动单元和储能单元；其中，
第一开关单元和第五开关单元的控制端均连接第一扫描信号线；第一开关单元的第一端连接工作电压，第一开关单元的第二端连接像素驱动单元的输入端；第五开关单元的第一端连接像素驱动单元的输出端，第二端连接发光模块；
第二开关单元和第四开关单元的控制端均连接第二扫描信号线；第二开 关单元的第一端连接像素驱动单元的输入端，第二开关单元的第二端连接储能单元的第二端以及像素驱动单元的控制端；第四开关单元的第一端连接像素驱动单元的输出端，第四开关单元的第二端连接数据电压线；
第三开关单元的控制端连接第三扫描信号线，第三开关单元的第一端连接储能单元的第二端，第三开关单元的第二端连接低电平线；
所述触控检测模块包括检测子模块和输出子模块；其中，所述检测子模块分别连接第三扫描信号线、第二工作电压、数据电压线，用于检测触控信号；输出子模块分别连接第二扫描信号线、触控信号读取线以及所述检测子模块，用于根据第二扫描信号线的输入向所述触控信号读取线输出触控检测信号。
可替换的，所述发光模块包括电致发光元件，所述电致发光元件的阳极与所述第五开关单元的第二端相连。
可替换的，所述储能单元为电容。
可替换的，所述输出子模块包括第六开关单元，所述第六开关单元的第一端连接所述触控信号读取线，第二端连接所述检测子模块。
可替换的，所述检测子模块包括第七开关单元、触控信号驱动单元、感测电容和触控电极，所述第七开关单元的第一端连接所述数据电压线，第二端连接所述触控信号驱动单元的控制端，控制端连接第三扫描信号线；触控信号驱动单元的输入端连接第二工作电压，输出端连接第六开关单元；所述感测电容连接在所述触控信号驱动单元的输入端与控制端之间；所述触控电极与所述触控信号驱动单元的控制端相连。
可替换的，各个开关单元和驱动单元为薄膜晶体管。
可替换的，各个薄膜晶体管均为P沟道型；驱动单元的控制端为薄膜晶体管的栅极，输入端为源极，输出端为漏极；各个开关单元的控制端为薄膜晶体管的栅极，第一端和第二端分别对应于源极和漏极。
本发明还提供了一种包括上述像素电路的显示面板。
进一步的，所述像素电路在所述显示面板中呈周期性分布。
本发明还提供了一种包括上述显示面板的显示装置。
本发明提供的像素电路中，集成了像素补偿模块和触控检测模块，并使像素补偿模块和触控检测模块共用数据电压线和扫描信号线。这样就能减少 信号线路的数目，从而大幅缩减像素间距大小并降低IC成本，从而获得更高的像素密度。同时，本发明提供的像素电路中，流经电致发光单元的工作电流不受对应的驱动晶体管的阈值电压的影响，能够避免由于驱动晶体管的阈值电压漂移导致显示亮度不均。
附图说明
图1为通常的一种像素驱动电路的电路结构图；
图2为本发明实施例提供的像素电路的电路结构示意图；
图3为本发明实施例提供的像素电路的驱动方法中关键信号的时序图；
图4a-c为本发明实施例中的像素电路在不同时序下的电流流向和电压值的示意图；
图5为本发明提供的像素电路中像素电极的电势变化的示意图；
图6为本发明实施例提供的显示面板中像素电路与像素的一种位置关系的示意图。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。附图中，采用相同的附图标记来表示相同的元件。
图2为本发明实施例提供的像素电路的电路结构示意图。如图2所示，该像素电路包括：
像素补偿模块100、发光模块200和触控检测模块；
其中，像素补偿模块100包括第一开关单元T1、第二开关单元T2、第三开关单元T3、第四开关单元T4、第五开关单元T5、像素驱动单元DT1、储能单元C1，其中，第一开关单元T1的第一端连接工作电压Vdd，第二端连接像素驱动单元DT1的输入端，第五开关单元T5的第一端连接像素驱动单元DT1的输出端，第二端连接发光模块；第一开关单元T1和第五开关单元T5的控制端均连接第一扫描信号线Em，像素驱动单元DT1的控制端连接储能单元C1的第二端b端；
第二开关单元T2的第一端连接像素驱动单元DT1的输入端，第二端连 接储能单元C1的第二端b端，控制端连接第二扫描信号线Scan[1]；
第三开关单元T3的第一端连接储能单元C1的第二端b端，第二端连接低电平Vcom，控制端连接第三扫描信号线Scan[2]；
第四开关单元T4的第一端连接像素驱动单元DT1的输出端，第二端连接数据电压线Data，控制端连接第二扫描信号线Scan[1]；
储能单元C1的第一端a端连接工作电压Vdd；
触控检测模块包括检测子模块310和输出子模块320；其中，检测子模块310分别连接第三扫描信号线Scan[2]、第二工作电压Vint、数据电压线Data，用于检测触控信号；输出子模块分别连接第二扫描信号线Scan[1]、触控信号读取线Y-read line以及检测子模块310，用于根据第二扫描信号线Scan[1]的输入向所述触控信号读取线Y-read line输出触控检测信号。
本发明提供的像素电路中，集成了像素补偿模块和触控检测模块，并使像素补偿模块和触控检测模块共用数据电压和扫描信号线。这样就能减少信号线路的数目，从而大幅缩减像素间距大小并降低IC成本，从而获得更高的像素密度。同时，流经电致发光单元的工作电流不受对应的驱动晶体管的阈值电压的影响，彻底解决了由于驱动晶体管的阈值电压漂移导致显示亮度不均的问题。
这里的第二工作电压Vint用于提供检测触控所需要的驱动脉冲。
例如，发光模块200可以包括电致发光元件，电致发光元件的阳极与T5的第二端相连。
本发明实施例中，电致发光元件可以是通常的包括发光二极管(Light Emitting Diode，简称LED)或有机发光二极管(Organic Light Emitting Diode，简称OLED)在内的多种具有电致发光功能的器件。在本发明实施例中，以OLED为例进行说明。
进一步的，储能单元C1为电容。当然实际应用中，根据设计需要也可以采用其他具有储能功能的元件。
进一步的，如图2所示，输出子模块320包括：第六开关单元T6，第六开关单元T6的第一端连接触控信号读取线Y-read Line，第二端连接检测子模块310，控制端连接第二扫描信号线Scan[1]。
进一步的，检测子模块310包括第七开关单元T7、触控信号驱动单元 DT2、感测电容C2以及触控电极d，第七开关单元T7的第一端连接数据电压线Data，第二端连接触控信号驱动单元DT2的控制端，第七开关单元的控制端连接第三扫描信号线Scan[2]；触控信号驱动单元DT2的输入端连接第二工作电压Vint，输出端连接第六开关单元T6；感测电容C2连接在触控信号驱动单元DT2的输入端与控制端之间；触控电极d与DT2的控制端相连，由于C2的其中一端也与DT2的控制端相连，则C2连接DT2的控制端的一端也与触控电极d相连。
进一步的，各个开关单元和驱动单元为薄膜晶体管TFT。
进一步的，如图2所示，各个薄膜晶体管均为P沟道型。此时，驱动单元的输入端为TFT的源极，输出端为TFT的漏极，控制端为TFT的栅极。对于各个开关单元来说，控制端同样为TFT的栅极，第一端和第二端分别对应于TFT的源极和漏极。
不难理解，这里的驱动单元和开关单元对应的晶体管可以为源漏极可以互换的晶体管，或者根据导通类型的不同，各个开关单元和驱动单元的第一端可能为晶体管的漏极、第二端为晶体管的源极，本领域技术人员在不付出创造性的劳动的前提下，对本发明提供的像素电路中各个晶体管进行源漏极的反接所得到的、能够取得与本发明提供的技术方案所能达到的技术效果相同或相似的电路结构同样应落入本发明的保护范围。
使用同一类型的晶体管，能够实现工艺流程的统一，从而提高产品的良品率。本领域技术人员可以理解的是，在实际应用中，各个晶体管的类型也可以不完全相同，例如T1和T5可以为N沟道型晶体管，而T4和T6可以为P沟道型晶体管，只要能够使控制端连接到同一扫描信号线的两个开关单元的导通/关断状态相同，即可实现本申请提供的技术方案，本发明所描述的实施方式不应理解为对本发明保护范围的限定。
下面结合图3和图4对图2中的像素电路的工作原理进行说明，为了方便说明，例如各个开关单元和驱动单元为P沟道型TFT，储能单元为电容。图3为本发明提供的像素电路工作时一种可能的各个扫描信号线的扫描信号和数据电压线上的数据电压Vdata在一帧内的时序图，可分为三个阶段，在图3中分别表示为第一阶段W1(像素补偿模块重置和触控检测模块重置阶段)、第二阶段W2(像素补偿模块充电和触控检测模块检测阶段)、第三 阶段W3(像素补偿模块发光和触控检测模块停滞阶段)。图4a-c为本发明实施例中的像素电路在不同时序下的电流流向和电压值的示意图。在上述各个阶段W1-W3，像素电路的电流流向和电压值分别如图4a、图4b、图4c所示。
在第一阶段W1，参见图3，此时Scan[2]为低电平，其他扫描信号线和数据电压线为高电平。参见图4a，在像素补偿模块100中，仅T3导通，此时b点连接到低电平Vcom(例如为接地线)，电势为0V，将电容C1中上一帧的电压信号重置。
在触控检测模块中，T7导通，T6和DT2关闭，实现对触控检测模块的重置，重置以后触控电极d的电势与此时施加到Data线上的电压相等(例如为Vdata)，并由于电容C2也与触控电极d相连，触控电极d的电势被维持为Vdata。可见，Scan[2]相当于像素补偿模块100和触控检测模块的重置扫描信号线Reset line。
在第二阶段W2，参见图3，此时Scan[1]为低电平，其他扫描信号线为高电平，保持Data线上的电压不变。参见图4b，在像素补偿模块100中，T2和T4导通，T1、T3、T5断开，由于之前b点接地，所以像素驱动单元DT1打开，Data线通过T4→DT1→T2开始对b点进行充电，一直将b点充电到Vdata-Vth为止(DT1栅源两极之间的压差为Vth，其中Vth为DT1的阈值电压)，同时，由于a点电位始终为Vdd，在充电完毕后，b点的电位一直维持在Vdata-Vth，另外由于T5的关闭使得电流不会通过OLED，间接降低了OLED的寿命损耗。
在触控检测模块中，参见图4b中，T7关闭，T6导通。图5为本发明提供的像素电路中像素电极的电势变化的示意图。在第二阶段W2，如图5所示，当手指触摸时，参见图中的虚线部分，触控电极d的电势Vd降低(例如降低Vf)，从而直接导致DT2栅极电势降低达到DT2的导通条件，此时Vint经DT2和T6向Y-read line输入电信号，在手指触摸导致Vd直接降低Vf之后，由于电容C2放电，Vd持续下降至0；而如果此时没有手指触控，参见实线部分，触控电极d的电势Vd也就不会降低，仍维持为Vdata，此时DT2截止，Y-read line中无法检测到电信号。
当DT2的栅源电压满足MOS管导通条件，才会有信号通过DT2。“等 待”着DT2栅极电势降低的这个阶段为触控信号驱动单元缓冲阶段，而降低的主要诱因就是手指的触摸。
此时如果有手指的触摸，会直接导致触控电极d的电势降低，达到了DT2导通的条件，此时I&V特性曲线在放大区，DT2作为放大TFT会将耦合脉冲的信号导通并放大，由Y-Read Line采集Y方向的信号。而Scan[1]作为X方向(行方向)扫描信号也具有采集功能(因为仅在Scan[1]为低电平的时刻能够采集到Y方向的信号，且在特定的时刻特定行的像素中的Scan[1]为低电平信号，这样就能够根据采集到的触控信号的时刻确定Scan[1]扫描到了哪一行，从而确定X的坐标)。这样就确定了手指触摸位置的X、Y坐标。此过程只要手指参与触控，坐标位置随时都可以采集到。
可见，在本发明实施例中，Scan[1]起到了X方向触控信号读取线X-read line的作用。
在第三阶段W3，如图3所示，仅Em为低电平，其他扫描信号线为高电平，如图4c所示，在像素补偿模块100中，此时T1、T5导通，T2、T3、T4关断。Vdd沿T1→DT1→T5使得OLED开始发光。
在触控检测模块中，所有元器件都不工作，触控检测模块处于停滞状态。这样能够减少对显示过程的影响。
因此，可以根据饱和区TFT的电流特性，得出流经像素驱动单元DT1的电流为：
IOLED＝K(VGS-Vth)2＝K[Vdd-(Vdata-Vth)-Vth]2
＝K(Vdd-Vdata)2
由上式中可以看到此时工作电流IOLED已经不受Vth的影响，只与Vdd和Vdata的差值有关。彻底解决了驱动TFT由于工艺制作及长时间的操作造成阈值电压(Vth)漂移的问题，消除其对IOLED的影响，保证OLED的正常工作。
本发明还提供了一种包括上述像素电路的显示面板。
可替换的，所述的像素电路在所述显示面板中呈周期性分布。实际应用中，并不需要在每个像素对应的位置都采用本发明实施例提供的像素电路(例如三个像素中设置一个本发明实施例提供的像素电路，在其他像素中设置普通的像素电路)，同样能够实现对触控信号的检测。如图6所示，为每三个 像素设置一个本发明实施例提供的像素电路(PU)的情形。
本发明还提供了一种包括上述显示面板的显示装置。
这里的显示装置可以为：电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上所述仅是本发明的可替换实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为在本发明的保护范围之内。
本申请要求于2014年6月27日递交的中国专利申请第201410302129.8号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (10)

  1. 一种像素电路，包括：像素补偿模块、发光模块和触控检测模块；
    所述像素补偿模块包括第一至第五开关单元，像素驱动单元和储能单元；其中，
    第一开关单元和第五开关单元的控制端均连接第一扫描信号线；第一开关单元的第一端连接工作电压，第一开关单元的第二端连接像素驱动单元的输入端；第五开关单元的第一端连接像素驱动单元的输出端，第五开关单元的第二端连接发光模块；
    第二开关单元和第四开关单元的控制端均连接第二扫描信号线；第二开关单元的第一端连接像素驱动单元的输入端，第二开关单元的第二端连接储能单元的第二端以及像素驱动单元的控制端；第四开关单元的第一端连接像素驱动单元的输出端，第四开关单元的第二端连接数据电压线；
    第三开关单元的控制端连接第三扫描信号线，第三开关单元的第一端连接储能单元的第二端，第三开关单元的第二端连接低电平线；
    所述触控检测模块包括检测子模块和输出子模块；其中，所述检测子模块分别连接第三扫描信号线、第二工作电压、数据电压线，用于检测触控信号；输出子模块分别连接第二扫描信号线、触控信号读取线以及所述检测子模块，用于根据第二扫描信号线的输入向所述触控信号读取线输出触控检测信号。
  2. 如权利要求1所述的像素电路，其中，所述发光模块包括电致发光元件，所述电致发光元件的阳极与所述第五开关单元的第二端相连。
  3. 如权利要求1或2所述的像素电路，其中，所述储能单元为电容。
  4. 如权利要求1至3中任一项所述的像素电路，其中，所述输出子模块包括第六开关单元，所述第六开关单元的第一端连接所述触控信号读取线，第二端连接所述检测子模块。
  5. 如权利要求1至4中任一项所述的像素电路，其中，所述检测子模块包括第七开关单元、触控信号驱动单元、感测电容和触控电极，所述第七开关单元的第一端连接所述数据电压线，第二端连接所述触控信号驱动单元的控制端，控制端连接第三扫描信号线；触控信号驱动单元的输入端连接第二 工作电压，输出端连接第六开关单元；所述感测电容连接在所述触控信号驱动单元的输入端与控制端之间；所述触控电极与所述触控信号驱动单元的控制端相连。
  6. 如权利要求1-5任一项所述的像素电路，其中，各个开关单元和驱动单元为薄膜晶体管。
  7. 如权利要求6所述的像素电路，其中，各个薄膜晶体管均为P沟道型；驱动单元的控制端为薄膜晶体管的栅极，驱动单元的输入端为源极，驱动单元的输出端为漏极；各个开关单元的控制端为薄膜晶体管的栅极，第一端和第二端分别对应于源极和漏极。
  8. 一种包括如权利要求1-7任一项所述的像素电路的显示面板。
  9. 如权利要求8所述的显示面板，其中，所述像素电路在所述显示面板中呈周期性分布。
  10. 一种包括如权利要求8或9所述的显示面板的显示装置。
PCT/CN2014/087052 2014-06-27 2014-09-22 像素电路、显示面板及显示装置 WO2015196598A1 (zh)

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