WO2015096364A1 - 基于amoled的触控显示驱动方法 - Google Patents

基于amoled的触控显示驱动方法 Download PDF

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Publication number
WO2015096364A1
WO2015096364A1 PCT/CN2014/078025 CN2014078025W WO2015096364A1 WO 2015096364 A1 WO2015096364 A1 WO 2015096364A1 CN 2014078025 W CN2014078025 W CN 2014078025W WO 2015096364 A1 WO2015096364 A1 WO 2015096364A1
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Prior art keywords
signal lines
touch
amoled
display
phase
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PCT/CN2014/078025
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English (en)
French (fr)
Inventor
马占洁
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京东方科技集团股份有限公司
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Priority to US14/418,137 priority Critical patent/US9666122B2/en
Publication of WO2015096364A1 publication Critical patent/WO2015096364A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing 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
    • 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
    • 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
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0202—Addressing of scan or signal lines
    • G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
    • 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
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery

Definitions

  • Embodiments of the present invention relate to the field of display technologies, and in particular, to a touch display driving method based on AMOLED. Background technique
  • touch display technology has developed rapidly.
  • touch screen technology has gradually shifted from plug-in to embedded.
  • the embedded touch screen is designed to produce touch screen functions during the production of flat panel display devices to optimize functions, effects and costs.
  • the present invention provides a touch display driving method based on AMOLED.
  • the VDD signal line is used for touch sensing and positioning during the touch phase, thereby reducing the thickness and manufacturing cost of the display device.
  • a touch display driving method based on AMOLED including:
  • one cycle of the driving sequence is divided into a display phase and a touch sensing phase
  • a pulse signal is applied to the first group of power signal lines, and the position of the touch point is determined by detecting a change in the signal of the second group of power signal lines when touched.
  • the time period of the display phase is greater than the time period of the touch sensing phase.
  • one cycle of the driving sequence includes N frames, and the Nth frame is divided into a first time period and a second time period, and the first N - 1 frame and the Nth frame A time period is set to the display phase, and a second time period of the Nth frame is set to the touch sensing phase, where N is an integer not less than 2.
  • the time period of the first time period is greater than the time period of the second time period.
  • the number of signal lines in the first group of power signal lines and the second group of power signal lines of two adjacent groups is equal.
  • the AMOLED-based touch display driving method divides the driving timing into display and touch phases, and uses the VDD signal line for touch sensing and positioning during the touch phase, thereby eliminating the need to change the pixel structure of the AMOLED. , reducing the thickness of the display device and the manufacturing cost.
  • FIG. 1 is a schematic plan view showing a touch panel of a touch panel driving method based on an AMOLED according to an embodiment of the present invention
  • FIG. 2a is an equivalent circuit diagram of an AMOLED pixel structure with VDD IR Drop compensation function applied to an AMOLED-based touch display driving method according to an embodiment of the present invention
  • FIG. 2b is a functional division of the pixel structure of FIG. 2a according to the principle of touch function Simple circuit diagram
  • FIG. 3 is a schematic diagram of touch sensing of an AMOLED-based touch display driving method according to an embodiment of the invention.
  • FIG. 4 is a timing diagram of a touch display driving method based on AMOLED according to an embodiment of the invention. detailed description
  • the AMOLED display device compensates the IR Drop by using the set power signal line VDD (Voltage Drain Drain).
  • VDD Voltage Drain Drain
  • the equivalent circuit of the pixel structure (for example, a P-type thin film transistor) of the AMOLED-based touch display driving method according to the embodiment of the present invention includes: signal loading phase 1 and illumination Phase 2.
  • the transmission signal source EMISSION is changed from the output low voltage on signal to the output high voltage off signal, so that the switching transistor T2, the switching transistor ⁇ 3, and the switching transistor ⁇ 7 Shutdown; the reset signal source VRE SET is changed from the output high voltage off signal to the output low voltage on signal.
  • the reset transistor T4 is turned from the off state to the on state to reset the voltage of the end of the storage capacitor C1 connected to the source of the reset transistor T4.
  • the gate signal source V GATE is changed from the output high voltage off signal to the output low voltage on signal to control the switching transistor T5 and the switching transistor T6 to be turned from the off state to the on state, and the opening of the switching transistor T6 can connect the p type transistor T1 to One diode, the opening of the switching transistor T5
  • the current frame data signal output by the image frame data signal source V D ATA can be made to reach the storage capacitor
  • the reset signal source VRE SET and the gate signal source V EATE are both changed from the output low voltage on signal to the output high voltage off signal, and the transmission signal source V EMISSION is changed from the output high voltage off signal to the output low voltage on signal to control the switch.
  • the transistor T2, the switching transistor ⁇ 3, and the switching transistor ⁇ 7 are turned from the off state to the on state; the switching transistor ⁇ 7 is turned on so that the voltage of the signal output from the power signal line VDD reaches the end of the storage capacitor C1 connected to the drain of the switching transistor ⁇ 7, That is, the voltage at the terminal of the storage capacitor C1 is changed from the GND when the transmission signal source V EMSSroN is outputted by the high voltage off signal, so that the gate voltage of the p-type driving transistor T 1 is turned off by the output signal source V EMISSION V DATA + V thl becomes V DATA + V thl + ; switching transistor T2 is turned on so that the voltage of the signal output from the power signal line reaches the source of the p-type driving transistor T1; the opening of the switching transistor ⁇ 3 can make the p-type The drain current generated by transistor ⁇ 1 with its gate voltage V DATA + V thl + and source voltage 1 ⁇ 4 can reach OL The anode of ED
  • the storage capacitor C1 stops outputting the current frame data signal when the image frame data signal source V DATA stops outputting, the voltage signal having a voltage equal to V DATA + V thl + 1 ⁇ 4 is stored, and since the storage capacitor C1 and the p-type transistor The gate of T1 is connected, that is, the voltage of the gate of p-type transistor T1 is also V DATA + V thl + Vj , and at this time, the p-type transistor
  • the source voltage of T1 is Vi.
  • K is the current coefficient of the transistor
  • K C 0X ⁇ ⁇ ; ⁇ , C ox , W, J are the field-effect mobility of the transistor, the capacitance per unit area of the gate insulating layer, the channel width, and the length; the value of K in the same structure is relatively stable; i D is The drain current of the transistor;
  • V es is the voltage difference between the gate and the source of the transistor
  • V th is the threshold voltage of the transistor.
  • p-type transistor T1 Since the source voltage of the p-type transistor T1 is offset by 1 ⁇ 4 1 ⁇ 4 its gate voltage portion, p-type transistor T1 is offset by the threshold voltage V thl portion of its gate voltage V thl and therefore, the p-type drain of the transistor T1 The polar current is independent of the threshold voltage V th1 and the voltage V of the signal of the power supply signal line VDD.
  • VDD signal lines power line lines
  • one cycle of the driving sequence is divided into two phases: a display phase and a touch sensing phase.
  • the display phase applies a DC signal to all power signal lines (VDD signal lines).
  • all power signal lines are divided into two groups (logical division, no change in structure), that is, a first group of power signal lines and a second group of power signal lines, and the first Group power signal line And the second group of power signal lines are spaced apart on the substrate of the AMOLED.
  • the first set of power signal lines and the second set of power signal lines may be two sets of power signal lines that are perpendicular to each other to determine coordinates of the touch points.
  • a pulse signal (Dx) is applied to the first set of power signal lines, and the position of the touch point is determined by detecting a change in the signal (Ry) of the second set of power signal lines when touched. That is, the first group of power signal lines is equivalent to the driving signal electrodes (driving electrodes), and the second group of power signal lines is equivalent to the receiving signal electrodes (sensing electrodes).
  • the manner in which one cycle of the drive timing is divided into two phases is:
  • One cycle of the driving sequence may be one frame, and one frame is divided into two phases, namely, the display phase and the touch sensing phase described above.
  • the continuity of the display is ensured, and the duration of the display phase is greater than the duration of the touch sensing phase.
  • One cycle of the driving sequence may further include an N frame, and the Nth frame is divided into two time periods: a first time period and a second time period, and the first one of the first N-1 frame and the Nth frame
  • the time period is set to the display phase described above
  • the second time period of the Nth frame is set to the touch sensing phase described above, where N is an integer not less than 2.
  • the time period of the first time period is greater than the time period of the second time period.
  • the continuity of the display effect is stronger.
  • the number of respective ones of the first set of power signal lines and the second set of power signal lines of the adjacent two sets is equal. In this way, each of the driving signal electrodes and the sensing signal electrodes can be evenly distributed, so that the touch positioning is more accurate.
  • the touch technology is implemented by using a pixel structure having a VDD IR Drop compensation function, and those skilled in the art can understand that it can be applied to the basis of the embodiment according to the present invention.
  • the pixel structure of the touch display driving method of the AMOLED is not limited to the pixel structure shown in the figure.
  • the m cell touch touch technology of this mode can be designed according to the inventive concept of the present invention.
  • the driving sequence is divided into a display and a touch phase, and the touch is In the stage, the VDD signal line is used for touch sensing and positioning, so that no change in the process and space is caused to the pixel structure, thereby reducing the thickness and manufacturing cost of the display device.
  • VDD IR Drop compensation function pixel structure referred to in the embodiment of the present invention performs technical integration with in cell touch and its operation principle.
  • FIG. 1 is a plan view of a touch panel of an AMOLED-based touch display driving method according to an embodiment of the present invention. It can be seen that the touch panel is divided into a Dx direction for transmitting a driving signal, and is used for receiving a driving signal.
  • the Ry direction of the received signal that senses whether it has changed.
  • Each unit structure in the Dx direction and the Ry direction includes one or more pixel units (such as the pixel unit shown in Fig. 2a) depending on the situation.
  • the connection requires a jumper, as shown in Figure 1, the horizontal Dx touch unit is separated by a Ry vertical touch unit, so that the Dx touch unit connection requires traditional metal and/or ions.
  • the doped active layer is connected as a jumper.
  • FIG. 2b is a simplified circuit diagram of the function of the pixel structure of FIG. 2a according to the principle of the touch function, the pixel structure can be divided into two parts, the left part is divided by VDD (signal line), T7 (thin film transistor) and C1 ( The storage capacitor is composed of three parts, and the right part is composed of the remaining other devices and circuit connections.
  • VDD signal line
  • T7 thin film transistor
  • C1 the storage capacitor
  • a box is used instead of simplification.
  • the power supply signal line VDD plays different roles at different stages.
  • VDD is used as a DC signal source to provide a voltage signal to the pixel circuit to drive the OLED to emit light.
  • the VDD signal line is further divided into two parts, one part is used as the driving signal end Dx of the touch signal, and the other is A portion is used as a receiving end Ry of the touch signal to sense a signal from the driving signal terminal Ry.
  • the signal as the driving signal terminal Dx becomes a pulse signal in the touch phase, and the signal passes through the coupling capacitor C Dx — Ry (mutual coupling capacitance) between Dx and Ry, as shown in FIG. 3, and transmits the pulse signal to the receiving end. Ry, so that it also appears as a pulse signal with Dx, and has a specified amplitude.
  • the touch capacitors C f — 3 ⁇ 4 and — Ry coupled with Dx and Ry shown in FIG. 3 appear, which may result from the influence of the touch coupling capacitor.
  • C Dx Redistribution of charge and discharge between Ry causes the potential voltage of the receiving signal terminal Ry to change, and the Ry line feeds it back to the touch IC to locate the finger through the IC logic algorithm.
  • FIG. 3 shows the principle of mutual capacitance to realize the principle of touch control.
  • the present invention can also implement touch control by self-capacity principle, that is, each VDD signal line serves as both a driving end and a sensing end, and only needs to be used. Use the corresponding self-capacitive touch IC.
  • each frame of the AMOLED signal is divided into two stages, one stage is a display stage, and the stage is a display stage.
  • the power signal VDD is a DC signal
  • the VDD signal of each row is the same in this frame; in the final stage of each frame, or the last stage of displaying the last frame of several frames, the touch signal can be sent, that is, the touch phase is performed.
  • the touch phase only the VDD signal is turned into a pulse signal under the condition that other signals are constant.
  • the square wave type pulse signal is used, but other types of pulse signals are also applicable.
  • the pulse signal is simultaneously transmitted according to the Dx signal lines of different combination units, and the VDD signals of the columns Ry constituting the receiving unit are kept the same as the display phase, or other DC signals.
  • the combined connection of the touch signal lines Dx/Ry of each row and column can be connected inside each pixel, or in the peripheral wiring area of the display area, and the same signal lines of each unit are connected together.
  • the thin film transistor T7 is directly turned on, so that the power supply signal VDD is directly connected to the storage capacitor terminal. Since the power signal line area of the storage capacitor end is relatively large, the power signal line is suitable as an electrode end of the touch capacitor to improve the accuracy of the touch.
  • the original display timing is divided into a display phase and a touch phase, and no additional touch electrodes are added.
  • the method for locating the touch point in the touch phase is similar to the prior art and will not be described here.

Abstract

一种基于AMOLED的触控显示驱动方法，包括：在驱动AMOLED显示时，将驱动时序的一个周期划分为显示阶段和触控感应阶段；在所述显示阶段，对所有电源信号线施加一直流信号；在所述触控感应阶段，将所有电源信号线分成第一组电源信号线和第二组电源信号线，且使所述第一组电源信号线和第二组电源信号线相互垂直地分布在AMOLED的基板上；对第一组电源信号线施加脉冲信号，当触摸时通过检测第二组电源信号线的信号的变化来确定触摸点的位置。通过将驱动时序分成显示和触控阶段，在触控阶段利用原有的VDD信号线进行触控感应并定位，从而像素结构的工艺和空间不会发生变化，降低了显示装置的厚度及制作成本。

Description

基于 AMOLED的触控显示驱动方法
技术领域
本发明的实施例涉及显示技术领域， 特别涉及一种基于 AMOLED的触控显示驱动方法。 背景技术
近几年来， 触摸显示技术发展迅速， 为了提高产品的可靠性， 降 低成本， 实现更好的透光率， 减薄整个屏的厚度和重量等， 触摸屏技 术由外挂式逐渐转向嵌入式。嵌入式触摸屏就是在生产平板显示装置 的过程中， 制造出触摸屏功能， 达到功能、 效果和成本的最优化。
目前， 盒内触控（ in cell touch )技术已应用于 LCD产品的象素 结构中。 关于 AMOLED主动矩阵有机发光二极管, Active Matrix Organic Light Emitting Diode)面板内触控（ in Ecell touch )的方案主要 应用于底发射型有机发光二极管显示器， 在 TFT (薄膜晶体管， Thm Film Transistor )背板上形成投射式电容结构。 即在 AMOLED示结构 基础上设置一层触控结构， 因此增加了显示装置的厚度及制作成本。 发明内容
本发明提供一种基于 AMOLED的触控显示驱动方法， 通过将驱 动时序分成显示和触控阶段，在触控阶段利用 VDD信号线进行触控感 应并定位， 从而降低显示装置的厚度及制作成本。
根据本发明一个方面的实施例， 提供一种基于 AMOLED的触控 显示驱动方法， 包括：
在驱动 AMOLED显示时， 将驱动时序的一个周期划分为显示阶 段和触控感应阶段；
在所述显示阶段， 对所有电源信号线施加一直流信号； 以及 在所述触控感应阶段，将所有电源信号线分成第一组电源信号线 和第二组电源信号线，且使所述第一组电源信号线和第二组电源信号 线相互垂直地分布在 AMOLED的基板上； 以及
对第一组电源信号线施加一脉冲信号， 当触摸时通过检测第 二组电源信号线的信号的变化来确定触摸点的位置。
在上述基于 AMOLED的触控显示驱动方法中， 所述驱动时序的 在上述基于 AMOLED的触控显示驱动方法中， 所述显示阶段的 时间期间大于所述触控感应阶段的时间期间。
在上述基于 AMOLED的触控显示驱动方法中， 所述驱动时序的 一个周期包括 N帧， 第 N帧划分为第一时间段和第二时间段， 前 N - 1帧和第 N帧中的第一时间段设定为所述显示阶段， 第 N帧的第 二时间段设定为所述触控感应阶段， 其中 N 为不小于 2的整数。
在上述基于 AMOLED的触控显示驱动方法中， 所述第一时间段 的时间期间大于所述第二时间段的时间期间。
在上述基于 AMOLED的触控显示驱动方法中， 相邻两组的所述 第一组电源信号线和第二组电源信号线中的信号线数量相等。
根据本发明的上述实施例的基于 AMOLED的触控显示驱动方 法，将驱动时序分成显示和触控阶段，在触控阶段利用 VDD信号线进 行触控感应并定位， 从而不需要改变 AMOLED的像素结构， 降低了 显示装置的厚度及制作成本。 附图说明
图 1是适用于根据本发明的实施例的基于 AMOLED的触控显示 驱动方法的触控面板的平面结构示意图；
图 2a是适用于根据本发明的实施例的基于 AMOLED的触控显示 驱动方法的具有 VDD IR Drop补偿功能的 AMOLED像素结构的等效 电路图；
图 2b是图 2a的像素结构根据触控功能原理进行的功能划分后的 简易电路图；
图 3是根据本发明实施例的基于 AMOLED的触控显示驱动方法 的触控感应原理图； 以及
图 4是根据本发明实施例的基于 AMOLED的触控显示驱动方法 的时序图。 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详细 描述。 以下实施例用于说明本发明， 但不用来限制本发明的范围。
另外，在下面的详细描述中， 为便于解释， 阐述了许多具体的细 节以提供对本披露实施例的全面理解。 然而明显地， 一个或多个实施 例在没有这些具体细节的情况下也可以被实施。 在其他情况下， 公 一般地， AMOLED显示装置利用设置的电源信号线 VDD(电源电 压， Voltage Drain Drain )对 IR Drop (电阻压降）进行补偿， 其具体 原理如下：
如图 2a和图 4所示， 适用于本发明实施例的基于 AMOLED的 触控显示驱动方法的像素结构的等效电路（以 P型薄膜晶体管为例） 的工作包括： 信号加载阶段 1和发光阶段 2。
在信号加载阶段 1中， 图像帧数据信号源 VDATA开始输出当前帧 数据信号时， 发射信号源 EMISSION 由输出低压开启信号变为输出 高压关闭信号， 使开关晶体管 T2、 开关晶体管 Τ3和开关晶体管 Τ7 关断；复位信号源 VRESET由输出高压关闭信号变为输出低压开启信号 控制复位晶体管 T4 由关断状态变为开启状态， 以便将存储电容 C1 与复位晶体管 T4 的源极相连的一端的电压复位至 GND; 门信号源 VGATE由输出高压关闭信号变为输出低压开启信号以控制开关晶体管 T5和开关晶体管 T6由关断状态变为开启状态， 开关晶体管 T6的开 启可以将 p型晶体管 T1连接成一个二极管， 开关晶体管 T5的开启 可以使图像帧数据信号源 VD ATA输出的当前帧数据信号到达存储电容
C1与 p型驱动晶体管 T1的栅极相连的一端， 即存储电容 C1这一端 的电压为 VDATA+Vthl。
在发光阶段 2中， 复位信号源 VRESET和门信号源 VEATE都由输出低 压开启信号变为输出高压关闭信号， 发射信号源 VEMISSION由输出高压 关闭信号变为输出低压开启信号， 以控制开关晶体管 T2、开关晶体管 Τ3和开关晶体管 Τ7由关断状态变为开启状态； 开关晶体管 Τ7开启可 以使电源信号线 VDD输出的信号的电压 ¼到达存储电容 C1与开关晶 体管 Τ7的漏极相连的一端， 即存储电容 C1的这一端的电压由发射信 号源 VEMSSroN由输出高压关闭信号时的 GND变为 , 从而使 p型驱动 晶体管 T 1的栅极电压由发射信号源 VEMISSION由输出高压关闭信号时 的 VDATA+ Vthl变为 VDATA+ Vthl+ ； 开关晶体管 T2的开启可以使电源信 号线输出的信号的电压¼到达 ρ型驱动晶体管 T1的源极； 开关晶体管 Τ3的开启可以使 ρ型晶体管 Τ 1在其栅极电压 VDATA+ Vthl+ 与源极电 压¼的共同作用下产生的漏极电流能够到达 OLED D1的阳极， 并与 VSS共同驱动 OLED D1发光。
在该像素电路中， 由于存储电容 C1在图像帧数据信号源 VDATA 停止输出当前帧数据信号时，存储电压大小等于 VDATA+ Vthl+ ¼的电 压信号， 并且由于存储电容 C1与 p型晶体管 T1 的栅极相连， 即 p 型晶体管 T1的栅极的电压也为 VDATA+ Vthl+ Vj , 而此时 p型晶体管
T1的源极电压为 Vi。
由于此时的 p型驱动晶体管 T1工作在饱和区， 工作在饱和区的 p型晶体管 T1的栅极与源极的电压差为： VDATA+ Vthi+ Vi- VI=VDATA+ thi，
按照下述现有技术中晶体管工作在饱和区的电流特性的公式 , 可计算得到计算出 ρ型驱动晶体管 T1的漏
Figure imgf000005_0001
极电流：
Figure imgf000006_0001
其中， K为晶体管的电流系数；
K = C0X ^ ~； μ、 Cox、 W、 J分别为晶体管的场效应迁移率， 栅极绝缘层单位面积电容、 沟道宽度、 长度； 相同结构中 K 的值相 对稳定； iD为晶体管的漏极电流；
Ves为晶体管的栅极与源极的电压差；
Vth为晶体管的阈值电压。
由于 p型晶体管 T1的源极电压 ¼抵消了其栅极电压中 ¼的部分， p型晶体管 T1的阈值电压 Vthl抵消了其栅极电压中 Vthl的部分, 因此， p型晶体管 T1的漏极电流与其阈值电压 Vthl及电源信号线 VDD的信号 的电压 V大小无关。
由于流经 AMOLED的电流与 VDD信号无关， 这样 VDD信号的变 化， 不会对 AMOLED的显示造成影响。 这样便可利用不同行数或者 列数的电源信号线 （VDD信号线） 的组合， 构成不同行向和列向的 VDD信号线单元， 此些单元的 VDD信号在显示阶段可全部连成同一 信号 VDD保持正常的显示； 在触控阶段， 这些单元的 VDD信号可独 立提供 Dx/Ry 的触控信号， 来实现触控定位功能。
基于上述原理， 根据本发明实施例的基于 AMOLED的触控显示 驱动方法中， 在驱动 AMOLED显示时， 将驱动时序的一个周期划分 为前后两个阶段： 即显示阶段和触控感应阶段， 在所述显示阶段对所 有电源信号线 ( VDD信号线）施加一直流信号。在所述触控感应阶段， 将所有电源信号线分成两组 （逻辑上的划分， 结构上并无变化）， 即 第一组电源信号线和第二组电源信号线，且使所述第一组电源信号线 和第二组电源信号线间隔分布在 AMOLED的基板上。 在一种示例性 实施例中，第一组电源信号线和第二组电源信号线可以是相互垂直的 两组电源信号线， 以便确定触控点的坐标。 对第一组电源信号线施加 一脉冲信号（ Dx ), 当触摸时通过检测第二组电源信号线的信号（ Ry ) 的变化来确定触摸点的位置。即第一组电源信号线相当于驱动信号电 极 (驱动电极），第二组电源信号线相当于接收信号电极 (感应电极）。
在一种示例性实施例中，将驱动时序的一个周期划分为前后两个 阶段的方式包括：
方式一： 驱动时序的一个周期可以为一帧， 将一帧划分为前后两 个阶段， 即上述的显示阶段和触控感应阶段。 为了不影响显示效果， 保证显示的连续性， 显示阶段的时长大于触控感应阶段的时长。
方式二： 所述驱动时序的一个周期还可以包括 N帧， 第 N帧划 分为前后两个时间段： 第一时间段和第二时间段， 前 N - 1帧和第 N 帧中的第一时间段设定为上述的显示阶段， 第 N 帧的第二时间段设 定为上述的触控感应阶段， 其中 N 为不小于 2的整数。 进一步地， 第一时间段的时间期间大于第二时间段的时间期间。
一般地， 在第二种划分方式中， 显示效果的连续性更强。
在进一步的示例性实施例中，相邻两组的所述第一组电源信号线 和第二组电源信号线中各自的信号线数量相等。这样使得每个驱动信 号电极和感应信号电极能够均匀分布， 使得触控定位更加准确。
在根据本发明实施例的基于 AMOLED的触控显示驱动方法中， 利用具有 VDD IR Drop补偿功能的像素结构实现触控技术， 本领域的 技术人员可以理解， 可以适用于根据本发明实施例的基于 AMOLED 的触控显示驱动方法像素结构不限于图示的像素结构，凡是具有该功 能的像素结构， 根据本发明的发明构思均可设计出此方式的 m cell touch触控技术。
本发明实施例的方法中将驱动时序分成显示和触控阶段，在触控 阶段利用 VDD信号线进行触控感应并定位，从而不对像素结构造成任 何工艺上、 空间上进行任何变化， 从而降低了显示装置的厚度及制作 成本。
下面描述本发明的实施例中所引用的具有 VDD IR Drop补偿功 能像素结构如何进行与 in cell touch进行的技术整合及其工作原理。
图 1是适用于根据本发明的实施例的基于 AMOLED的触控显示 驱动方法的触控面板的平面结构图，可以看出触控面板分成发送驱动 信号的 Dx方向， 及用于接收驱动信号并感知其是否发生变法的接收 信号的 Ry方向。 其中 Dx方向和 Ry方向的每个单元结构都会根据不同 情况， 包含一个或一个以上的像素单元 （如图 2a所示的像素单元）。 不同像素结构中， 如果连接需要跳线， 如图 1中横向 Dx触控单元间， 间隔了一个 Ry的竖向触控单元， 这样 Dx触控单元连接便需要用传统 的金属和 （或者） 离子掺杂的有源层作为跳线进行连接。
图 2b是将图 2a的像素结构根据触控功能原理进行的功能划分后 的简易电路图， 该像素结构可划分成两个部分， 左部分由 VDD (信号 线）、 T7 (薄膜晶体管）和 C1 (存储电容） 三部分构成， 右部分由剩 余的其他器件及电路连接构成， 这里就用一个方块盒作为代替， 以便 进行简化。在图 2a中， 可以看出电源信号线 VDD在不同阶段起到不同 作用。在显示阶段 VDD作为一个直流信号源，给像素电路提供电压信 号， 以便驱动 OLED发光； 而在触控阶段， VDD信号线又分成两个部 分， 一部分作为触控信号的驱动信号端 Dx, 而另一部分作为触控信 号的接收端 Ry来进行感应自驱动信号端 Ry的信号。 而作为驱动信号 端 Dx的信号在触控阶段变成脉冲信号， 该信号通过 Dx和 Ry间的耦合 电容 CDx— Ry (互耦电容）， 如图 3所示， 将脉冲信号传递给接收端 Ry, 使其也出现和 Dx—致的脉冲信号， 且具有规定幅值。 如果当外部物 体，例如手指接触 AMOLED显示面板时，便出现图 3所示的与 Dx和 Ry 间耦合的触控电容 Cf— ¾和 — Ry, 由于此触控耦合电容的影响， 将导致 CDx—Ry间充放电的重新分布，导致接收信号端 Ry的电位电压发生变化, Ry线将其反馈给触控 IC,通过 IC逻辑算法定位出手指的
Figure imgf000009_0001
图 3示出了互容原理来是实现触摸控制的原理图， 当然本发明还 可通过自容原理来实现触摸控制， 即每个 VDD信号线既作为驱动端， 又作为感应端， 只需釆用相应的自容式触控 IC即可。
图 4是根据本发明实施例的基于 AMOLED的触控显示驱动方法 的时序图， 从本实施例图中可以看出， AMOLED的每帧信号分成两 个阶段，一个阶段是显示阶段,在显示阶段电源信号 VDD是直流信号， 并且在此帧中每行的 VDD信号相同； 在每帧的最后阶段，或者显示几 帧的最后一帧的最后阶段， 可以发送触控信号， 即进行触控阶段。 在 触控阶段，在其他信号均不变的条件下， 只将 VDD信号变成一个脉冲 信号， 本实施例中的釆用方波型脉冲信号， 但其他类型的脉冲信号同 样适用。 该脉冲信号按照不同组合单元的 Dx信号线同时进行发送， 而构成接收单元的各列 Ry的 VDD信号保持和显示阶段相同不变， 或 者是其他的直流信号。各行各列的触控信号线 Dx/Ry 的组合连接可以 在各个像素内部进行连接， 也可以在显示区外围布线区域， 每个单元 相同信号线连接在一起。
在触控阶段由于 EMISSION信号一直处于低压开启状态（因为本 实施例中的薄膜晶体管均是 P型结构）,这样薄膜晶体管 T7—直处于开 启状态，使得电源信号 VDD—直与存储电容端相连接， 由于存储电容 端的电源信号线面积相对比较大，这样使得电源信号线适合于作为触 控电容的电极端， 以便来提高触控的精度。
本发明中， 将原来的显示时序分成了显示阶段和触控阶段， 不增 加额外的触控电极。对于触控阶段如何定位触控点的方法与现有技术 类似， 此处不再赘述。
以上实施方式仅用于说明本发明， 而并非对本发明的限制， 有关 技术领域的普通技术人员， 在不脱离本发明的精神和范围的情况下， 还可以做出各种变化和变型，因此所有等同的技术方案也属于本发明 的范畴， 本发明的专利保护范围应由权利要求限定。

Claims

权 利 要 求 书
1、 一种基于 AMOLED的触控显示驱动方法， 包括：
在驱动 AMOLED显示时， 将驱动时序的一个周期划分为显示阶 在所述显示阶段， 对所有电源信号线施加一直流信号； 以及 在所述触控感应阶段，将所有电源信号线分成第一组电源信号线 和第二组电源信号线，且使所述第一组电源信号线和第二组电源信号 线相互垂直地分布在 AMOLED的基板上； 以及
对第一组电源信号线施加一脉冲信号， 当触摸时通过检测第 二组电源信号线的信号的变化来确定触摸点的位置。
2、 如权利要求 1所述的基于 AMOLED的触控显示驱动方法， 其中， 所述驱动时序的一个周期为一帧， 将一帧划分为所述显示阶段 和所述触控感应阶段。
3、 如权利要求 2所述的基于 AMOLED的触控显示驱动方法， 其中， 所述显示阶段的时间期间大于所述触控感应阶段的时间期间。
4、 如权利要求 1所述的基于 AMOLED的触控显示驱动方法， 其中， 所述驱动时序的一个周期包括 N帧， 第 N帧划分为第一时间 段和第二时间段，前 N - 1帧和第 N帧中的第一时间段设定为所述显 示阶段， 第 N帧的第二时间段设定为所述触控感应阶段， 其中 N为 不小于 2的整数。
5、 如权利要求 4所述的基于 AMOLED的触控显示驱动方法， 其中， 所述第一时间段的时间期间大于所述第二时间段的时间期间。
6、 如权利要求 1~5中任一项所述的基于 AMOLED的触控显示 驱动方法， 其中， 相邻两组的所述第一组电源信号线和第二组电源信 号线中的信号线数量相等。
PCT/CN2014/078025 2013-12-23 2014-05-21 基于amoled的触控显示驱动方法 WO2015096364A1 (zh)

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