WO2021147775A1 - 触控显示装置 - Google Patents

触控显示装置 Download PDF

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Publication number
WO2021147775A1
WO2021147775A1 PCT/CN2021/072019 CN2021072019W WO2021147775A1 WO 2021147775 A1 WO2021147775 A1 WO 2021147775A1 CN 2021072019 W CN2021072019 W CN 2021072019W WO 2021147775 A1 WO2021147775 A1 WO 2021147775A1
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WIPO (PCT)
Prior art keywords
touch
electrode
compensation electrode
touch display
display device
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Application number
PCT/CN2021/072019
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English (en)
French (fr)
Inventor
霍培荣
赵顺
罗鹏
钟德龙
王志强
Original Assignee
京东方科技集团股份有限公司
鄂尔多斯市源盛光电有限责任公司
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Application filed by 京东方科技集团股份有限公司, 鄂尔多斯市源盛光电有限责任公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/777,836 priority Critical patent/US11874573B2/en
Publication of WO2021147775A1 publication Critical patent/WO2021147775A1/zh

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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/1343—Electrodes
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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Definitions

  • the present disclosure relates to a display device, and more particularly to a touch display device.
  • An in-cell touch display device integrates touch electrodes into a display panel, and realizes the touch function and display function of the display panel through a time-sharing driving method. Since the in-cell touch technology does not need to separately fabricate the touch function layer after the display panel manufacturing process, the manufacturing process of the touch display device is simplified, and it is beneficial to realize the thin and light design of the display device. Therefore, the in-cell touch design has become a mainstream design solution for touch display devices.
  • the liquid crystal display device includes: a liquid crystal touch display panel 1 and a backlight module 2 arranged oppositely, and the liquid crystal touch display panel 1 is integrated There are touch electrodes 11, the backlight module 2 includes an optical film layer 21 and a backlight iron frame 22 supporting the optical film layer 21; the touch electrode 11 is electrically connected to the touch signal input terminal, the backlight iron frame 22 is grounded, and the touch electrode 11 A capacitor C 0 is formed between the backlight iron frame 22 and the chip (IC) through the touch signal input terminal to load the touch electrode 11 with a periodic high-frequency square wave pulse signal, because the pulse signal is positive or negative.
  • the electric field formed between the touch electrode 11 and the backlight iron frame 22 will induce positive or negative charges, so that the polarizer, diffuser, light guide plate and other dielectrics sandwiched between the touch electrode 11 and the backlight iron frame 22
  • the material film produces an electrostrictive effect.
  • the film layers of polarizers, diffusers, light guide plates, etc. will undergo horizontal and vertical deformations, which are finally manifested as vibrations on the surface of the capacitor C 0 formed between the touch electrode 11 and the backlight iron frame 22, and the user can hear the sound. Thereby affecting the use effect of the product.
  • the embodiment of the present disclosure provides a touch display device to solve the problems in the background art.
  • a touch display device which includes:
  • a backlight module includes a backlight iron frame
  • a liquid crystal touch display panel the liquid crystal touch display panel is located on the light emitting side of the backlight module, and includes: touch electrodes and compensation electrodes on the side of the touch electrodes facing the backlight module, the compensation The electrode and the backlight iron frame are electrically connected to the ground signal terminal; the touch electrode and the compensation electrode form a capacitor, and the product of the capacitance value of the capacitor and the resistance value of the compensation electrode is smaller than that of the touch control electrode.
  • the pulse width of the touch signal loaded by the electrode, and the order of magnitude of the product is smaller than the order of magnitude of the pulse width of the touch signal.
  • the liquid crystal touch display panel includes: an array substrate and a color filter substrate arranged oppositely, and a liquid crystal layer located between the array substrate and the color filter substrate; the backlight module is located in the array A side of the substrate away from the color filter substrate;
  • the touch electrodes are integrated in the array substrate, or the touch electrodes are integrated in the color filter substrate;
  • the compensation electrode is located in the array substrate.
  • the array substrate has a base substrate, and the compensation electrode is arranged in contact with the base substrate.
  • the compensation electrode is located on a side of the base substrate close to the touch electrode.
  • the compensation electrode is located on a side of the base substrate away from the touch electrode.
  • the base substrate has a display area and a non-display area surrounding the display area, the compensation electrode is located in the display area; the color filter substrate has a black matrix, and the compensation electrode is located on the substrate.
  • the orthographic projection on the base substrate is located within the orthographic projection range of the black matrix on the base substrate.
  • the base substrate has a display area and a non-display area surrounding the display area, and the compensation electrode is located in the non-display area and surrounds the display area.
  • the material of the compensation electrode is metal.
  • the compensation electrode is arranged on the entire surface, and the orthographic projection area of the backlight iron frame on the surface where the compensation electrode is located is the same as the area of the compensation electrode.
  • the material of the compensation electrode is a transparent conductive material.
  • the backlight module further includes an optical film layer on the side of the backlight iron frame facing the liquid crystal touch display panel, the backlight iron frame is used to support the optical film layer, the optical film
  • the layer at least includes a light guide plate and a diffusion sheet stacked in sequence.
  • FIG. 1 is one of structural schematic diagrams of a liquid crystal touch display device in the related art
  • FIG. 2 is the second structural diagram of a liquid crystal touch display device in the related art
  • FIG. 3 is one of the structural schematic diagrams of the touch display device provided by the embodiments of the disclosure.
  • Figure 4 is a schematic diagram of the RC differential circuit
  • Fig. 5 is a schematic diagram of waveform conversion corresponding to Fig. 4;
  • FIG. 6 is the second structural diagram of a touch display device provided by an embodiment of the disclosure.
  • FIG. 7 is the third structural diagram of a touch display device provided by an embodiment of the disclosure.
  • FIG. 8 is the fourth structural diagram of the touch display device provided by the embodiments of the disclosure.
  • FIG. 10 is a sixth structural diagram of a touch display device provided by an embodiment of the disclosure.
  • FIG. 11 is a simulation circuit diagram of a touch display device provided by an embodiment of the disclosure.
  • FIG. 12 is a schematic diagram of waveform conversion obtained by using the simulation of FIG. 11 in this disclosure.
  • Touch is based on charging transmission touch sensing technology, using a physical principle of charge retention, using a switch to apply a voltage to the sensing electrode in a short period of time to charge it, then turn off the switch, and use the second switch Then release the charge on the sensing electrode to a larger sampling capacitor.
  • the capacitance of the sensing electrode can be determined. Therefore, to realize the Touch function of Full In Cell products, the IC needs to output a modulation (high-frequency square wave) to the touch electrode.
  • the liquid crystal touch display device includes a liquid crystal touch display panel 1 and a backlight module 2 located on the light incident side of the liquid crystal touch display panel 1.
  • the liquid crystal touch display panel 1 includes a base substrate 01, touch electrodes 11 integrated in the liquid crystal touch display panel 1, and leads 02 electrically connected to each touch electrode 11.
  • Each lead 02 is electrically connected to the IC, and the IC is electrically connected to the flexible circuit board ( FPC), the touch electrode 11 is electrically connected to the touch signal input terminal, and a high-frequency square wave pulse signal is applied to each touch electrode through an IC;
  • the backlight module 2 includes a backlight iron frame 22, and the backlight iron frame 22 is grounded. That is, when the product reaches the module stage, after the backlight iron frame 22 is assembled, the backlight iron frame 22 and the touch electrode 11 inside the Panel form a capacitor. After a high-frequency pulse signal is applied between the capacitor plates, the lower polarizer between the touch electrode 11 and the backlight iron frame 22 and the various film layers of the backlight will undergo electrostriction, that is, the reverse piezoelectric effect.
  • the touch signal when the touch signal is applied to the touch electrode 11, under the action of the AC electric field, the electric field (shown by the dashed arrow) formed between the touch electrode 11 and the backlight iron frame 22 will generate induced charges, which will cause the touch
  • an embodiment of the present disclosure provides a touch display device, as shown in FIG. 3, including:
  • the backlight module 2 includes a backlight iron frame 22;
  • the liquid crystal touch display panel 1 is located on the light emitting side of the backlight module 2, that is, the backlight module 2 is located on the light incident side of the liquid crystal touch display panel 1.
  • the liquid crystal touch display panel 1 includes: touch The control electrode 11, and the compensation electrode R on the side of the touch electrode 11 facing the backlight module 2, the compensation electrode R and the backlight iron frame 22 are electrically connected to the ground signal terminal GND; the touch electrode 11 and the compensation electrode R form a capacitor C ,
  • the product of the capacitance value of the capacitor C and the resistance value of the compensation electrode R is smaller than the pulse width T of the touch signal loaded to the touch electrode 11, and the order of magnitude of the product is smaller than the pulse width T of the touch signal.
  • the compensation electrode is provided on the side of the touch electrode facing the backlight module in the liquid crystal touch display panel, so that the touch electrode and the compensation electrode form a capacitor, and the capacitor and the compensation electrode form an RC Differential circuit
  • the circuit structure is shown in Figure 4, u i (t) represents the input voltage, u 0 (t) represents the output voltage, the RC differential circuit can convert a rectangular wave into a spike wave, as shown in Figure 5, Figure 5
  • the upper waveform diagram represents the touch signal (rectangular pulse) loaded to the touch electrode, and the bottom waveform diagram of Figure 5 represents the sharp pulse output after the touch signal on the touch electrode passes through the RC differentiation circuit, and the output sharp pulse waveform
  • the width T is related to R*C (ie the time constant of the circuit).
  • R*C the sharper the spike waveform, and vice versa.
  • the R*C of this circuit must be much smaller than the width of the input waveform, otherwise it will be lost.
  • the function of the waveform transformation becomes a general RC coupling circuit.
  • R*C is less than or equal to 1/10 of the input waveform width. That is, the capacitor C charges and discharges very quickly during operation, and the output signal will be affected by this.
  • Two-way spikes (close to the amplitude of the input signal) appear, that is, the compensation electrode R (output terminal) outputs a sharp pulse wave.
  • An equal amount of positive and negative charges are induced between the compensation electrode R and the backlight iron frame 22, and the positive and negative charges are in the And, the electric field induced charge is 0.
  • the compensation electrode 6 added in the present disclosure is arranged in the liquid crystal touch display panel and is located on the side of the touch electrode 11 facing the backlight module 2, the liquid crystal touch display panel and the backlight iron
  • the dielectric material layers such as the light guide plate, diffuser and polarizer between the frames 22 are also located between the compensation electrode R and the backlight iron frame 22. Therefore, the dielectric material layers such as the light guide plate, diffuser and polarizer do not induce charge. Therefore, the capacitor formed by the touch electrode 11 and the backlight iron frame 22 will not vibrate, and the problem of howling of the liquid crystal touch display panel is improved, thereby improving the use effect of the product.
  • the touch mode provided by the embodiments of the present disclosure may be self-capacitive touch.
  • Each touch electrode 11 is block-shaped and distributed in an array.
  • the touch electrode 11 and the lead 02 may be located on a different layer. Connect through vias.
  • the above-mentioned backlight iron frame is electrically connected to the ground signal terminal to eliminate static electricity formed on the surface of the backlight iron frame.
  • the RC differential circuit can be formed by connecting the compensation electrodes R with different resistance values in series to ensure that the compensation electrodes R in series and the touch electrodes are connected in series.
  • the C formed between the control electrodes satisfies the relationship of the RC differential circuit, that is, RC ⁇ T, in order to realize the function of the RC differential circuit waveform transformation.
  • the liquid crystal touch display panel 1 includes: an array substrate 10 and a color filter substrate 20 arranged oppositely, and The liquid crystal layer 30 between the array substrate 10 and the color filter substrate 20; the backlight module 2 is located on the side of the array substrate 10 away from the color filter substrate 20; specifically, the array substrate 10 includes a plurality of pixel units and a plurality of thin films arranged in an array Transistor and metal wiring; the color film substrate 20 includes at least red, green, and blue color resistance units arranged in an array and a black matrix arranged between adjacent color resistance units; the color film substrate 20 is used to make the display panel realize color show;
  • the touch electrode 11 is integrated in the array substrate 10; or as shown in FIG. 7, the touch electrode 11 is integrated in the color filter substrate 20;
  • the compensation electrode R is located in the array substrate 10 (the compensation electrode R is not shown in FIGS. 6 and 7).
  • the touch electrode 11 is integrated in the color filter substrate 20 as an example for description.
  • the array substrate 10 has a lining
  • the base substrate 12 and the compensation electrode R are arranged in contact with the base substrate 12.
  • the upper and lower surfaces of the liquid crystal touch display panel 1 are also provided with polarizers, that is, polarizers are provided on the side of the base substrate 12 of the array substrate 10 close to the backlight module 2, and the base substrate of the color filter substrate 20 is far away from the array.
  • a polarizer is provided on one side of the substrate 10.
  • the present disclosure is to solve the problem that the dielectric material layers such as the polarizer, the diffuser, and the light guide plate between the touch electrode 11 and the backlight iron frame 22 of the backlight module 2 do not undergo electrostriction. Therefore, the compensation electrode R is arranged in contact with the base substrate 12 of the array substrate 10, so that dielectric material layers such as polarizers, diffusers, and light guide plates are located between the compensation electrode R and the backlight iron frame 22, through the function of the RC differential circuit , Not only can solve the problem that the dielectric material layers such as polarizer, diffuser and light guide plate will not be electrostrictive, but also the compensation electrode R will not affect the touch display function of the liquid crystal touch display panel.
  • the compensation electrode R may be located on the side of the base substrate 12 close to the touch electrode 11; or as shown in FIG. 9, the compensation electrode R The electrode R may also be located on the side of the base substrate 12 away from the touch electrode 11. Arranging the compensation electrode R on the surface of the base substrate 12 will not affect the production of other functional film layers in the array substrate and the color filter substrate, and thus will not cause defects in the liquid crystal touch display panel.
  • the base substrate has a display area and a non-display area surrounding the display area, and the compensation electrode is located in the display area;
  • the color filter substrate has a black matrix, and the compensation electrode is located in the display area.
  • the orthographic projection on the base substrate is located within the orthographic projection range of the black matrix on the base substrate.
  • the compensation electrode may be electrically connected to the ground terminal GND on the flexible circuit board (FPC) through a via hole penetrating the insulating layer in the panel.
  • the material of the compensation electrode can be metal (Al, Mg, etc.) or transparent conductive material (ITO, etc.).
  • the base substrate has a display Area and the non-display area surrounding the display area
  • the compensation electrode R is located in the non-display area and surrounds the display area.
  • the compensation electrode R may be electrically connected to the ground terminal GND pin (PIN) on the flexible circuit board (FPC) through a via hole penetrating the insulating layer in the panel.
  • the material of the compensation electrode can be metal (Al, Mg, etc.) or transparent conductive material (ITO, etc.).
  • the compensation electrode can also be arranged on the entire surface, and the orthographic projection area of the backlight iron frame on the surface where the compensation electrode is located is the same as the area of the compensation electrode.
  • the material of the compensation electrode is a transparent conductive material (ITO, etc.).
  • the backlight module 2 further includes an optical module located on the side of the backlight iron frame 22 facing the liquid crystal touch display panel 1.
  • the film layer 21 and the backlight iron frame 22 are used to support the optical film layer 21.
  • the optical film layer 21 at least includes a light guide plate and a diffusion sheet (not shown in the figure) stacked in sequence.
  • the light guide plate is used to conduct light
  • the diffusion sheet is used to diffuse optics to ensure that the backlight module 2 provides uniform and stable light to the liquid crystal touch display panel 1.
  • the above-mentioned optical film layer also includes other functional film layers well known to those skilled in the art, which will not be described in detail here.
  • XSC1 and XSC2 are oscilloscopes
  • XSC1 is the signal output terminal
  • XSC2 is the touch screen.
  • Control signal input terminal where the product of the capacitance value of the capacitor C and the resistance value of the compensation electrode R is much smaller than the pulse width of the touch signal loaded to the touch electrode, so that the touch electrode is loaded through XSC2 as shown in Figure 12 (above)
  • the touch signal (rectangular anti-wave signal) shown, after passing through the RC circuit, the signal output by XSC1 is shown in Figure 12 (below).
  • the output waveform is a positive-negative sharp pulse waveform, which can be seen:
  • the rectangular anti-wave signal on the touch electrode can be changed into a positive and negative sharp pulse waveform, that is, the compensation electrode R (output terminal) outputs a sharp pulse wave
  • the compensation electrode R and The back light iron frame 22 induces equal amounts of positive and negative charges due to the action of the electric field, and the positive and negative charges are neutralized, that is, the electric field induced charge is 0, thereby compensating for the conduction between the electrode R and the back light iron frame.
  • Dielectric material layers such as light plates, diffusers and polarizers have no effect of inducing charges and thus will not produce electro-induced contraction. Therefore, the capacitor formed by the touch electrode and the backlight iron frame will not vibrate, which improves the use effect of the product.
  • the above-mentioned touch display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the compensation electrode is provided on the side of the touch electrode facing the backlight module in the liquid crystal touch display panel, so that the touch electrode and the compensation electrode form a capacitor, and the capacitor and the compensation electrode form an RC Differential circuit, because the product of the capacitance value of the capacitor and the resistance value of the compensation electrode is smaller than the pulse width of the touch signal loaded to the touch electrode, and the product of the capacitance value of the capacitor and the resistance value of the compensation electrode is of order of magnitude smaller than that of the touch signal
  • the order of magnitude of the pulse width that is, the product of the capacitance value of the capacitor and the resistance value of the compensation electrode is much smaller than the pulse width of the touch signal loaded on the touch electrode, so that the touch signal (usually a high-frequency square wave) is input to the touch electrode.
  • the RC differential circuit can convert the square wave pulse signal in the same direction into positive and negative sharp pulse waves, that is, the compensation electrode (output terminal) outputs the sharp pulse wave, and the compensation electrode and the backlight iron frame induces etc.
  • the amount of positive and negative charges neutralizes the positive and negative charges.
  • the compensation electrode added in the present disclosure is arranged in the liquid crystal touch display panel and is located on the side of the touch electrode facing the backlight module, the liquid crystal touch display panel
  • the dielectric material layers such as the light guide plate, diffuser and polarizer between the backlight iron frame and the compensation electrode are also located between the compensation electrode and the backlight iron frame, so the dielectric material layers such as the light guide plate, diffuser and polarizer do not induce charge Therefore, the capacitor formed by the touch electrode and the backlight iron frame will not vibrate, and the use effect of the product will be improved.

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Abstract

一种触控显示装置，通过在液晶触控显示面板（1）内触控电极（11）面向背光模组（2）一侧设置补偿电极（R），触控电极（11）和补偿电极（R）构成电容（C），该电容（C）和补偿电极（R）构成RC微分电路，且电容（C）的电容值和补偿电极的电阻值之乘积远小于向触控电极加载的触控信号的脉宽，这样在给触控电极（11）输入触控信号(一般为高频方波脉冲信号)时，RC微分电路可以将同向的方波脉冲信号转化为正负向的尖脉冲波，补偿电极（R）和背光铁框（22）之间感生出等量的正电荷和负电荷，正电荷和负电荷中和，因此位于补偿电极（R）和背光铁框（22）之间的导光板、扩散片和偏光片等介电材料层没有感生电荷的作用，从而不会产生电致收缩，因此触控电极（11）和背光铁框（22）构成的电容器不会发生振动，提高产品的使用效果。

Description

触控显示装置
相关申请的交叉引用
本申请要求在2020年01月21日提交中国专利局、申请号为202010072504.X、申请名称为“一种触控显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及显示装置，尤其涉及一种触控显示装置。
背景技术
内嵌式触控显示装置(In Cell Touch Display)是将触控电极集成于显示面板中，并且通过分时驱动的方式实现显示面板的触控功能和显示功能。由于内嵌式触控技术不用在显示面板制程之后再单独制作触控功能层，从而简化了触控显示装置的制程，并且有利于实现显示装置的轻薄化设计。因此，内嵌式触控设计已成为触控显示装置的主流设计方案。
内嵌式触控技术在液晶显示装置中的应用十分广泛，如图1所示，液晶显示装置包括：相对设置的液晶触控显示面板1和背光模组2，液晶触控显示面板1内集成有触控电极11，背光模组2包括光学膜层21和支撑光学膜层21的背光铁框22；触控电极11与触控信号输入端电连接，背光铁框22接地，触控电极11和背光铁框22之间会形成电容器C 0，在芯片(IC)通过触控信号输入端给触控电极11加载周期性的高频方波脉冲信号时，由于该脉冲信号为正向或负向，触控电极11与背光铁框22之间形成的电场会感生出正电荷或负电荷，使得夹在触控电极11与背光铁框22之间的偏光片、扩散片、导光板等电介质材料膜层产生电致伸缩效应。各偏光片、扩散片、导光板等膜层会发生横向、纵向的形变，最终表现为触控电极11与背光铁框22之间形成的电容器C 0表面产生振动，使用者可以听到声音，从而影响产品的使用效 果。
发明内容
本公开实施例提供的一种触控显示装置，用以解决背景技术中的问题。
因此，本公开实施例提供了一种触控显示装置，其中，包括：
背光模组，所述背光模组包括背光铁框；
液晶触控显示面板，所述液晶触控显示面板位于所述背光模组的出光侧，包括：触控电极以及位于所述触控电极面向所述背光模组一侧的补偿电极，所述补偿电极和所述背光铁框均与接地信号端电连接；所述触控电极和所述补偿电极构成电容，所述电容的电容值和所述补偿电极的电阻值之乘积小于向所述触控电极加载的触控信号的脉宽，且所述乘积的数量级小于所述触控信号脉宽的数量级。
可选地，所述液晶触控显示面板包括：相对设置的阵列基板和彩膜基板，以及位于所述阵列基板和所述彩膜基板之间的液晶层；所述背光模组位于所述阵列基板远离所述彩膜基板一侧；
所述触控电极集成于所述阵列基板内，或所述触控电极集成于所述彩膜基板内；
所述补偿电极位于所述阵列基板内。
可选地，所述阵列基板具有衬底基板，所述补偿电极与所述衬底基板接触设置。
可选地，所述补偿电极位于所述衬底基板靠近所述触控电极一侧。
可选地，所述补偿电极位于所述衬底基板远离所述触控电极一侧。
可选地，所述衬底基板具有显示区域和包围所述显示区域的非显示区域，所述补偿电极位于所述显示区域；所述彩膜基板具有黑矩阵，所述补偿电极在所述衬底基板上的正投影位于所述黑矩阵在所述衬底基板上的正投影范围内。
可选地，所述衬底基板具有显示区域和包围所述显示区域的非显示区域，所述补偿电极位于所述非显示区域且包围所述显示区域。
可选地，所述补偿电极的材料为金属。
可选地，所述补偿电极整面设置，且所述背光铁框在所述补偿电极所在面的正投影面积与所述补偿电极的面积相同。
可选地，所述补偿电极的材料为透明导电材料。
可选地，所述背光模组还包括位于所述背光铁框面向所述液晶触控显示面板一侧的光学膜层，所述背光铁框用于支撑所述光学膜层，所述光学膜层至少包括依次层叠设置的导光板和扩散片。
附图说明
图1为相关技术中液晶触控显示装置的结构示意图之一；
图2为相关技术中液晶触控显示装置的结构示意图之二；
图3为本公开实施例提供的触控显示装置的结构示意图之一；
图4为RC微分电路示意图；
图5为图4对应的波形转换示意图；
图6为本公开实施例提供的触控显示装置的结构示意图之二；
图7为本公开实施例提供的触控显示装置的结构示意图之三；
图8为本公开实施例提供的触控显示装置的结构示意图之四；
图9为本公开实施例提供的触控显示装置的结构示意图之五；
图10为本公开实施例提供的触控显示装置的结构示意图之六；
图11为本公开实施例提供的触控显示装置的仿真电路图；
图12为本公开采用图11仿真得到的波形转换示意图。
具体实施方式
为了使本公开的目的、技术方案和优点更加清楚，下面将结合附图对本公开提供的触控显示装置作进一步地详细描述，显然，所描述的实施例仅是 本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本公开保护的范围。
附图中各部件的形状和大小不反映真实比例，目的只是示意说明本公开内容。
Touch是基于充电传输触摸感应技术，利用了一种电荷保持的物理原理，使用一个开关在一个短时间内施加一个电压到感应电极上对其充电，之后将这个开关断开，用第二个开关再将感应电极上的电荷释放到更大的一个采样电容中。通过测量多个充电-传输周期后的电荷，可以确定感应电极的电容。因此，实现Full In Cell产品的Touch功能，IC需要输出modulation(高频方波)到触控电极上。首先，对相关技术中液晶触控显示装置的背光铁框和触控电极之间产生感应电荷使得夹在触控电极与背光铁框之间的偏光片、扩散片、导光板等电介质材料膜层产生电致伸缩效应进行详细说明，如图2所示，该液晶触控显示装置包括液晶触控显示面板1和位于液晶触控显示面板1入光侧的背光模组2，液晶触控显示面板1包括衬底基板01、集成在液晶触控显示面板1内的触控电极11、与各触控电极11电连接的引线02，各引线02电连接至IC，IC电连接至柔性电路板(FPC)，触控电极11与触控信号输入端电连接，通过IC向各触控电极加载高频方波脉冲信号；背光模组2包括背光铁框22，背光铁框22接地。即当产品到模组阶段，组装背光铁框22后，背光铁框22与Panel内部的触控电极11形成电容。该电容极板之间加高频的脉冲信号后，触控电极11到背光铁框22之间的下偏光片及背光的各个膜层会发生电致伸缩，也就是逆压电效应。这样在给触控电极11加载触控信号时，在交流电场的作用下，触控电极11和背光铁框22之间形成的电场(虚线箭头所示)会产生感应电荷，使得夹在触控电极11与背光铁框22之间的偏光片、扩散片、导光板等电介质材料膜层产生电致伸缩效应，最终表现为触控电极11与背光铁框22之间形成的电容器表面产生振动，可以听到声音，出现啸叫问题，影响用户正常使用或者降低用户使用的体验，成为行业内手机 产品的一大难题。
有鉴于此，本公开实施例提供了一种触控显示装置，如图3所示，包括：
背光模组2，背光模组2包括背光铁框22；
液晶触控显示面板1，液晶触控显示面板1位于背光模组2的出光侧，也即，背光模组2位于液晶触控显示面板1的入光侧，液晶触控显示面板1包括：触控电极11，以及位于触控电极11面向背光模组2一侧的补偿电极R，补偿电极R和背光铁框22均与接地信号端GND电连接；触控电极11和补偿电极R构成电容C，电容C的电容值和补偿电极R的电阻值之乘积小于向触控电极11加载的触控信号的脉宽T，且乘积的数量级小于触控信号的脉宽T的数量级。
本公开实施例提供的上述触控显示装置，通过在液晶触控显示面板内触控电极面向背光模组一侧设置补偿电极，这样触控电极和补偿电极构成电容，该电容和补偿电极构成RC微分电路，电路结构如图4所示，u i(t)表示输入电压，u 0(t)表示输出电压，RC微分电路可把矩形波转换为尖脉冲波，如图5所示，图5上面的波形图表示向触控电极加载的触控信号(矩形脉冲)，图5下面的波形图表示触控电极上的触控信号经过RC微分电路后输出的尖脉冲，输出的尖脉冲波形的宽度T与R*C有关(即电路的时间常数)，R*C越小，尖脉冲波形越尖，反之则宽，此电路的R*C必须远远小于输入波形的宽度，否则就失去了波形变换的作用，变为一般的RC耦合电路了，一般R*C少于或等于输入波形宽度的1/10就可以了，即工作当中电容C充、放电速度极快，输出信号由此会出现双向尖峰(接近输入信号幅度)，即补偿电极R(输出端)输出尖脉冲波，补偿电极R和背光铁框22之间感生出等量的正电荷和负电荷，正电荷和负电荷中和，使电场感生电荷为0，由于本公开增加的补偿电极6是设置于液晶触控显示面板内且位于触控电极11面向背光模组2一侧，因此液晶触控显示面板和背光铁框22之间的导光板、扩散片和偏光片等介电材料层也位于补偿电极R和背光铁框22之间，因此导光板、扩散片和偏光片等介电材料层没有感生电荷的作用，从而不会产生电致收缩，因此触控电极11和背 光铁框22构成的电容器不会发生振动，改善液晶触控显示面板啸叫的问题，从而提高产品的使用效果。
在具体实施时，本公开实施例提供的触控模式可以为自容式触控，各个触控电极11为块状，呈阵列分布，触控电极11具体可以与引线02位于不同层，二者通过过孔连接。
在具体实施时，上述背光铁框与接地信号端电连接可以消除背光铁框表面形成的静电。
在具体实施时，可以根据目前各液晶产品型号的触控电极对应加载的不同充电脉冲信号的脉宽T，搭配串联不同电阻值的补偿电极R形成RC微分电路，保证串联的补偿电极R与触控电极之间构成的C满足RC微分电路的关系，即RC<<T，以实现RC微分电路波形变换的作用。
在具体实施时，在本公开实施例提供的上述触控显示装置中，如图6和图7所示，液晶触控显示面板1包括：相对设置的阵列基板10和彩膜基板20，以及位于阵列基板10和彩膜基板20之间的液晶层30；背光模组2位于阵列基板10远离彩膜基板20一侧；具体地，阵列基板10包括阵列排布的多个像素单元、多个薄膜晶体管和金属走线；彩膜基板20至少包括阵列排布的红、绿、蓝三色色阻单元和设置于相邻色阻单元之间的黑矩阵；彩膜基板20用于使显示面板实现彩色显示；
如图6所示，触控电极11集成于阵列基板10内；或如图7所示，触控电极11集成于彩膜基板20内；
补偿电极R位于阵列基板10内(图6和图7未示出补偿电极R)。
在具体实施时，在本公开实施例提供的上述触控显示装置中，如图8和图9所示，以触控电极11集成于彩膜基板20内为例进行说明，阵列基板10具有衬底基板12，补偿电极R与衬底基板12接触设置。具体地，液晶触控显示面板1的上下表面还设置偏光片，即在阵列基板10的衬底基板12靠近背光模组2一侧设置偏光片，以及在彩膜基板20的衬底基板远离阵列基板10一侧设置偏光片，本公开是为了解决触控电极11与背光模组2的背光铁框22 之间的偏光片、扩散片和导光板等介电材料层不会发生电致伸缩，从而将补偿电极R与阵列基板10的衬底基板12接触设置，这样偏光片、扩散片和导光板等介电材料层就位于补偿电极R与背光铁框22之间，通过RC微分电路的作用，不仅能够解决偏光片、扩散片和导光板等介电材料层不会发生电致伸缩，而且补偿电极R不会影响液晶触控显示面板的触控显示功能。
在具体实施时，在本公开实施例提供的上述触控显示装置中，如图8所示，补偿电极R可以位于衬底基板12靠近触控电极11一侧；或如图9所示，补偿电极R也可以位于衬底基板12远离触控电极11一侧。将补偿电极R设置在衬底基板12的表面，不会影响阵列基板和彩膜基板内其它功能性膜层的制作，从而不会导致液晶触控显示面板的不良。
在具体实施时，在本公开实施例提供的上述触控显示装置中，衬底基板具有显示区域和包围显示区域的非显示区域，补偿电极位于显示区域；彩膜基板具有黑矩阵，补偿电极在衬底基板上的正投影位于黑矩阵在衬底基板上的正投影范围内。通过将补偿电极设置成位于黑矩阵的正投影范围内，这样补偿电极的设置不仅不会影响面板内像素的开口率，而且能够实现触控电极与背光铁框之间的偏光片、扩散片和导光板等介电材料层不会发生电致伸缩。具体地，补偿电极可以通过贯穿面板内绝缘层的过孔与柔性电路板(FPC)上的接地端GND电连接。补偿电极的材料可以为金属(Al、Mg等)或透明导电材料(ITO等)。
在具体实施时，为了进一步防止补偿电极的设置会带来液晶触控显示面板出现其它不良问题，在本公开实施例提供的上述触控显示装置中，如图10所示，衬底基板具有显示区域和包围显示区域的非显示区域，补偿电极R位于非显示区域且包围显示区域。具体地，补偿电极R可以通过贯穿面板内绝缘层的过孔与柔性电路板(FPC)上的接地端GND引脚(PIN)电连接。补偿电极的材料可以为金属(Al、Mg等)或透明导电材料(ITO等)。
在具体实施时，在本公开实施例提供的上述触控显示装置中，补偿电极也可以整面设置，且背光铁框在补偿电极所在面的正投影面积与补偿电极的 面积相同。具体地，补偿电极的材料为透明导电材料(ITO等)。
在具体实施时，在本公开实施例提供的上述触控显示装置中，如图8和图9所示，背光模组2还包括位于背光铁框22面向液晶触控显示面板1一侧的光学膜层21，背光铁框22用于支撑光学膜层21，光学膜层21至少包括依次层叠设置的导光板和扩散片(图中未示出)。具体地，导光板用于传导光线，扩散片用于扩散光学，以保证背光模组2向液晶触控显示面板1提供均匀稳定的光线。
当然，在具体实施时，上述光学膜层还包括本领域技术人员熟知的其它功能性膜层，在此不做详述。
下面对本公开实施例提供的触控显示装置增加的补偿电极与背光铁框接地之后的波形进行仿真，具体地，如图11所示，XSC1和XSC2为示波器，XSC1为信号输出端，XSC2为触控信号输入端，其中电容C的电容值和补偿电极R的电阻值之乘积远小于向触控电极加载的触控信号的脉宽，这样通过XSC2给触控电极加载如图12(上)所示的触控信号(矩形防波信号)，经过RC电路之后，XSC1输出的信号如图12(下)所示，可以看出输出的波形为正负向尖脉冲波形，由此可以看出，本公开的触控显示装置设置补偿电极R之后，可以将触控电极上的矩形防波信号变成正负向尖脉冲波形，即补偿电极R(输出端)输出尖脉冲波，补偿电极R和背光铁框22之间由于电场的作用感生出等量的正电荷和负电荷，正电荷和负电荷中和，即电场感生电荷为0，由此补偿电极R和背光铁框之间的导光板、扩散片和偏光片等介电材料层没有感生电荷的作用，从而不会产生电致收缩，因此触控电极和背光铁框构成的电容器不会发生振动，提高产品的使用效果。
本公开实施例提供的上述触控显示装置可以为：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。
本公开实施例提供的上述触控显示装置，通过在液晶触控显示面板内触控电极面向背光模组一侧设置补偿电极，这样触控电极和补偿电极构成电容， 该电容和补偿电极构成RC微分电路，由于电容的电容值和补偿电极的电阻值之乘积小于向触控电极加载的触控信号的脉宽，且电容的电容值和补偿电极的电阻值之乘积的数量级小于触控信号的脉宽的数量级，即电容的电容值和补偿电极的电阻值之乘积远小于向触控电极加载的触控信号的脉宽，这样在给触控电极输入触控信号(一般为高频方波脉冲信号)时，RC微分电路可以将同向的方波脉冲信号转化为正负向的尖脉冲波，即补偿电极(输出端)输出尖脉冲波，补偿电极和背光铁框之间感生出等量的正电荷和负电荷，正电荷和负电荷中和，由于本公开增加的补偿电极是设置于液晶触控显示面板内且位于触控电极面向背光模组一侧，因此液晶触控显示面板和背光铁框之间的导光板、扩散片和偏光片等介电材料层也位于补偿电极和背光铁框之间，因此导光板、扩散片和偏光片等介电材料层没有感生电荷的作用，从而不会产生电致收缩，因此触控电极和背光铁框构成的电容器不会发生振动，提高产品的使用效果。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (11)

  1. 一种触控显示装置，其中，包括：
    背光模组，所述背光模组包括背光铁框；
    液晶触控显示面板，所述液晶触控显示面板位于所述背光模组的出光侧，包括：触控电极以及位于所述触控电极面向所述背光模组一侧的补偿电极，所述补偿电极和所述背光铁框均与接地信号端电连接；所述触控电极和所述补偿电极构成电容，所述电容的电容值和所述补偿电极的电阻值之乘积小于向所述触控电极加载的触控信号的脉宽，且所述乘积的数量级小于所述触控信号脉宽的数量级。
  2. 如权利要求1所述的触控显示装置，其中，所述液晶触控显示面板包括：相对设置的阵列基板和彩膜基板，以及位于所述阵列基板和所述彩膜基板之间的液晶层；所述背光模组位于所述阵列基板远离所述彩膜基板一侧；
    所述触控电极集成于所述阵列基板内，或所述触控电极集成于所述彩膜基板内；
    所述补偿电极位于所述阵列基板内。
  3. 如权利要求2所述的触控显示装置，其中，所述阵列基板具有衬底基板，所述补偿电极与所述衬底基板接触设置。
  4. 如权利要求3所述的触控显示装置，其中，所述补偿电极位于所述衬底基板靠近所述触控电极一侧。
  5. 如权利要求3所述的触控显示装置，其中，所述补偿电极位于所述衬底基板远离所述触控电极一侧。
  6. 如权利要求3所述的触控显示装置，其中，所述衬底基板具有显示区域和包围所述显示区域的非显示区域，所述补偿电极位于所述显示区域；所述彩膜基板具有黑矩阵，所述补偿电极在所述衬底基板上的正投影位于所述黑矩阵在所述衬底基板上的正投影范围内。
  7. 如权利要求3所述的触控显示装置，其中，所述衬底基板具有显示区 域和包围所述显示区域的非显示区域，所述补偿电极位于所述非显示区域且包围所述显示区域。
  8. 如权利要求6或7所述的触控显示装置，其中，所述补偿电极的材料为金属。
  9. 如权利要求1所述的触控显示装置，其中，所述补偿电极整面设置，且所述背光铁框在所述补偿电极所在面的正投影面积与所述补偿电极的面积相同。
  10. 如权利要求6、7、9任一项所述的触控显示装置，其中，所述补偿电极的材料为透明导电材料。
  11. 如权利要求1所述的触控显示装置，其中，所述背光模组还包括位于所述背光铁框面向所述液晶触控显示面板一侧的光学膜层，所述背光铁框用于支撑所述光学膜层，所述光学膜层至少包括依次层叠设置的导光板和扩散片。
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CN110471558A (zh) * 2019-07-24 2019-11-19 武汉华星光电技术有限公司 触控显示装置及触控显示器
CN111258457A (zh) * 2020-01-21 2020-06-09 京东方科技集团股份有限公司 一种触控显示装置

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CN113424139B (zh) 2024-04-09
CN111258457B (zh) 2021-10-19
EP4095657A1 (en) 2022-11-30
US20220308410A1 (en) 2022-09-29
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CN111258457A (zh) 2020-06-09
EP4095657A4 (en) 2023-07-19

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