WO2021147367A1 - 一种触控显示装置 - Google Patents
一种触控显示装置 Download PDFInfo
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- WO2021147367A1 WO2021147367A1 PCT/CN2020/118436 CN2020118436W WO2021147367A1 WO 2021147367 A1 WO2021147367 A1 WO 2021147367A1 CN 2020118436 W CN2020118436 W CN 2020118436W WO 2021147367 A1 WO2021147367 A1 WO 2021147367A1
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- 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
- 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
- G02F1/1362—Active matrix addressed cells
- G02F1/136218—Shield 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal 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
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- 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
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- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
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- 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
- 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
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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Definitions
- This application relates to a display device, and more particularly to a touch display device.
- the touch display device combines touch electrodes with a display panel to realize the function of touch display.
- touch technology is widely used in liquid crystal display devices.
- the liquid crystal display device includes a liquid crystal display panel and a backlight module.
- the backlight module is mainly composed of a backlight source and a metal back plate.
- the metal backplane is grounded, and the touch electrode combined with the liquid crystal display device is loaded with periodic high-frequency rectangular pulse signals, so that there is a formation between the touch electrode and the metal backplane.
- an embodiment of the present application provides a touch display device, and the specific solution is as follows:
- a touch display device provided by an embodiment of the application includes a liquid crystal display panel, a touch electrode, and a backlight module located on the light incident side of the liquid crystal display panel, and the backlight module includes a metal back plate;
- the touch display device further includes a shield electrode on a side of the touch electrode facing the backlight module, and the shield electrode and the metal back plate are both grounded;
- the touch electrode and the shield electrode form a capacitor, and the product of the capacitance value of the capacitor and the resistance value of the shield electrode is smaller than the pulse width of the touch signal loaded on the touch electrode.
- the product of the capacitance value of the capacitor and the resistance value of the shield electrode is of an order of magnitude smaller than the pulse width of the touch signal.
- the liquid crystal display panel includes: a first substrate and a second substrate disposed opposite to each other, and the first substrate and the second substrate are located between the first substrate and the second substrate.
- Liquid crystal layer, the backlight module is located on the side of the first substrate away from the second substrate;
- the touch electrode is located between the first substrate and the second substrate, or on a side of the second substrate away from the liquid crystal layer;
- the shielding electrode is located on the side of the first substrate facing the liquid crystal layer, or the shielding electrode is located on the side of the first substrate facing away from the liquid crystal layer.
- the liquid crystal display panel further includes: a thin film transistor array film layer on the side of the first substrate facing the liquid crystal layer and a thin film transistor array film layer on the first substrate; The first polarizer on the side of the substrate away from the liquid crystal layer;
- the shield electrode is located between the first substrate and the thin film transistor array film layer, or the shield electrode is located between the first substrate and the first polarizer.
- the material of the shielding electrode is metal or a transparent conductive material.
- the first substrate has a display area and a frame area surrounding the display area, the shielding electrode is located in the display area, and the shielding electrode It is a grid structure.
- the liquid crystal display panel further includes: a black matrix located between the first substrate and the second substrate;
- the orthographic projection of the shielding electrode on the first substrate is located within the orthographic projection range of the black matrix on the first substrate.
- the first substrate has a display area and a non-display area surrounding the display area, and the shielding electrode is located in the frame area and surrounds the display area. area.
- the material of the shielding electrode is a transparent conductive material
- the orthographic projection of the shielding electrode on the first substrate covers the first substrate.
- it further includes: a driving chip, a flexible circuit board, and a printed circuit board, the driving chip is located on the first substrate or on the flexible circuit board , The printed circuit board is located on the side of the metal back plate away from the liquid crystal display panel, and the printed circuit board is electrically connected to the liquid crystal display panel through the flexible circuit board;
- the metal backplane is electrically connected to the ground signal terminal on the printed circuit board.
- the shielding electrode is located between the first substrate and the thin film transistor array film layer, and the shielding electrode is connected to the flexible circuit board.
- the ground signal terminal is electrically connected.
- the shielding electrode is located between the first substrate and the first polarizer, and the shielding electrode is electrically connected to the metal back plate through Realize grounding.
- the backlight module further includes: a backlight on the side of the metal back plate facing the liquid crystal display panel, a conductive bumper, and Flexible conductive tape; among them:
- the metal back plate is used to support the backlight source
- the conductive bumper is located between the backlight source and the shield electrode and directly contacts the shield electrode, and the orthographic projection of the conductive bumper on the first substrate is located on the frame of the first substrate within the area;
- Both ends of the flexible conductive tape are directly in contact with the conductive pad and the metal back plate, respectively.
- FIG. 1 is one of structural schematic diagrams of a liquid crystal touch display device in the related art
- FIG. 2 is one of the structural schematic diagrams of the touch display device provided by an embodiment of the application.
- Figure 3 is a schematic diagram of the RC differential circuit
- 4a is a schematic diagram of the input signal waveform of the RC differential circuit corresponding to FIG. 3;
- 4b is a schematic diagram of the output signal waveform of the RC differentiation circuit corresponding to FIG. 3;
- FIG. 5 is the second structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 6 is the third structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 7 is one of the structural schematic diagrams of the shielding electrode in the touch display device provided by the embodiment of the application.
- FIG. 9 is the third structural diagram of the shielding electrode in the touch display device provided by the embodiment of the application.
- FIG 10 is the fourth structural diagram of the shielding electrode in the touch display device provided by the embodiment of the application.
- FIG. 11 is a fourth structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 12 is the fifth structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 13 is a sixth structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 14 is a seventh structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 15 is the eighth structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 16 is a ninth structural diagram of the touch display device provided by an embodiment of the application.
- FIG. 17 is a simulation circuit diagram of a touch display device provided by an embodiment of the application.
- FIG. 18 is a schematic diagram of waveform conversion obtained by simulation of FIG. 17 in this application.
- the IC needs to output a modulation signal (a high-frequency square wave signal) to the touch electrode.
- a modulation signal (a high-frequency square wave signal)
- the liquid crystal touch display device includes a liquid crystal display panel 1 and a backlight module 2 on the light incident side of the liquid crystal display panel 1.
- the liquid crystal display panel 1 includes an array substrate 01 and is integrated in The touch electrode 02 in the liquid crystal display panel 1, the lead 03 electrically connected to each touch electrode 02, each lead 03 is electrically connected to the IC, the IC is electrically connected to the flexible circuit board (FPC), the touch electrode 02 and the touch signal
- the input terminal is electrically connected, and a high-frequency rectangular pulse signal is applied to each touch electrode 02 through an IC;
- the backlight module 2 includes a metal back plate 04, and the metal back plate 04 is grounded. That is, when the product reaches the module stage, after the metal back plate 04 is assembled, the metal back plate 04 and the touch electrode 02 form a capacitor.
- the dielectric material film layer between the touch electrode 02 and the metal back plate 04 will undergo electrostriction, that is, the inverse piezoelectric effect.
- the touch signal is applied to the touch electrode 02, under the action of the AC electric field, the electric field (shown by the dashed arrow) formed between the touch electrode 02 and the metal back plate 04 will generate induced charges, so that it is located on the touch electrode.
- the dielectric material film layer between 02 and the metal back plate 04 produces an electrostrictive effect, which results in elastic deformation and vibration.
- the human ear approaches the sound caused by the film vibration can be clearly heard, that is, howling problems occur. , Affecting the normal use of users or reducing user experience, has become a major problem for mobile phone products in the industry.
- an embodiment of the present application provides a touch display device to solve the problem of howling in a mobile phone.
- a touch display device provided by an embodiment of the present application, as shown in FIG. 2, includes a liquid crystal display panel (not shown in FIG. 2), touch electrodes 30, and a backlight module 20 on the light incident side of the liquid crystal display panel.
- the backlight module 20 includes a metal back plate 21;
- the touch display device further includes a shield electrode 40 on the side of the touch electrode 30 facing the backlight module 20, and the shield electrode 40 and the metal back plate 21 are both grounded to GND;
- the touch electrode 30 and the shield electrode 40 constitute a capacitor C, and the product of the capacitance value of the capacitor C and the resistance value of the shield electrode 40 is smaller than the pulse width Tw of the touch signal applied to the touch electrode 30.
- a shield electrode is provided on the side of the touch electrode facing the backlight module, and the shield electrode is grounded, so that the touch electrode and the shield electrode constitute a capacitor, and the capacitor and the shield electrode constitute a capacitor C
- the product of the capacitance value of the capacitor C and the resistance value of the shield electrode 40 is smaller than the pulse width Tw of the touch signal loaded to the touch electrode 30, so that the series structure of the capacitor C and the resistor R is formed as shown in the figure
- u i (t) represents the input voltage
- u 0 (t) represents the output voltage.
- the RC differential circuit can convert the rectangular pulse signal into a sharp pulse signal, thereby changing the shape of the electric field between the shield electrode and the metal back plate, so that the dielectric material film between the shield electrode and the metal back plate is in the changing direction of the electric field Polarization is not easy to occur, electrostriction conditions cannot be achieved, and mechanical vibration cannot be achieved, which can effectively improve the howling problem.
- the product RC of the capacitance value of the capacitor and the resistance value of the shield electrode represents the time constant of the RC differential circuit, where the unit of the capacitance is F (Farad), the unit of resistance is ⁇ (ohm), and the time The unit of the constant is s (second).
- the touch signal loaded on the touch electrode is a rectangular pulse signal, which is high at t1 and ends at t2 (relatively showing as Low level), the time interval between t1 and t2 is the pulse width Tw.
- the touch electrode changes from low level to high level. Since the voltage across the capacitor C cannot change suddenly, the voltage u i (t) is all across the resistor R at this time. Then the capacitor C is gradually charged, the voltage across the capacitor C increases exponentially, and the output voltage u 0 (t) on the resistor R decreases exponentially.
- the smaller the resistance R of the shield electrode the smaller the RC, and the faster the charging process.
- the touch electrode changes from a high level to a low level, the capacitor C begins to discharge gradually, and the voltage across the capacitor C decreases exponentially.
- the capacitor C is reversely charged through the resistor R, and the output voltage u 0 (t) (presenting a negative voltage) on the resistor R increases exponentially.
- the capacitor C is completely discharged, and the output voltage u 0 (t) on the resistor R becomes zero.
- the smaller the resistance of the shield electrode the smaller the RC, and the faster the discharge process.
- the width of the spike signal is related to RC (that is, the time constant of the circuit). The smaller the RC, the sharper the spike signal. Otherwise, it is wide.
- RC must be smaller than the width of the input waveform, otherwise it loses the function of waveform transformation and becomes a general RC coupling circuit.
- This application uses the RC differential circuit to convert the same direction rectangular pulse signal on the touch electrode into the positive and negative sharp pulse signal on the shield electrode, thereby changing the electric field between the shield electrode and the metal back plate, so that the shield electrode and the metal back
- the same amount of positive and negative charges are induced between the plates, and the positive and negative charges are neutralized, so that the electric field induced charge is 0, so that the dielectric material film between the shielding electrode and the metal back plate is not prone to polarization. Electrostrictive conditions cannot be achieved, and mechanical vibration cannot be achieved, which can effectively improve the howling problem.
- the backlight module 20 generally also includes a backlight source 22 located on the side of the metal back plate 21 facing the liquid crystal display panel 10, and the metal back plate 21 is used to support Backlight 22.
- the metal back plate 21 is generally formed of iron, and the metal back plate 21 is grounded to eliminate static electricity formed on the surface of the metal back plate 21.
- the RC differential circuit can be formed with shielding electrodes of different resistances in series to ensure that the shielding electrode and the touch electrode are formed
- the capacitance C satisfies the relationship of the RC differential circuit.
- the product of the capacitance value of the capacitor C and the resistance value of the resistor R can be in the order of magnitude smaller than the pulse width Tw of the touch signal, so as to achieve the effect of the RC differential circuit waveform transformation.
- RC is less than or equal to 1/10 of the pulse width Tw of the touch signal to meet the requirement.
- the liquid crystal display panel 10 includes: a first substrate 11 and a second substrate 12 disposed opposite to each other, located between the first substrate 11 and the second substrate 12
- the liquid crystal layer 13 and the backlight module 20 are located on the side of the first substrate 11 away from the second substrate 12.
- the touch display device provided by the embodiment of the application may be applicable to an external touch screen (Add on Mode Touch Panel), a cover surface touch screen (On Cell Touch Panel), or an in-cell touch panel (In Cell Touch Panel), which will not be used here. limited.
- the externally mounted touch screen is produced separately from the touch electrode and the liquid crystal display panel, and then the touch electrode is attached to the light emitting side of the liquid crystal display panel. Covering the surface type touch screen is to form the touch electrode directly on the light emitting side of the liquid crystal display panel.
- the touch electrode is located on the side of the second substrate away from the liquid crystal layer. The distance between the touch electrode and the metal back plate is relatively large, and the capacitance formed by the touch electrode and the metal back plate is small, so the whistling phenomenon It is not obvious, but if there is a whistling phenomenon, this application can also be solved.
- the in-cell touch screen embeds the touch electrodes inside the liquid crystal display panel.
- the touch electrodes are located between the first substrate and the second substrate.
- the distance between the touch electrodes and the metal back plate is relatively small.
- the capacitance formed by the board is relatively large, so howling is most likely to occur. Therefore, the touch display device provided by the present application is particularly suitable for an in-cell touch screen.
- the shielding electrode 40 may be arranged on the side of the first substrate 11 facing the liquid crystal layer 13, or as shown in FIG. 6, the shielding electrode 40 may be arranged on the first substrate 11 away from the liquid crystal layer 13. One side.
- the RC differential circuit formed by the touch electrode 30 and the shield electrode 40 converts the same direction rectangular pulse signal on the touch electrode 30 into a positive and negative sharp pulse signal on the shield electrode 40, thereby changing the shield electrode 40 and the metal back plate 21
- the electric field between the shielding electrode 40 and the metal back plate 21 induces equal amounts of positive and negative charges, and the positive and negative charges are neutralized, so that the electric field induced charge is 0, and the shielding electrode 40 and the metal back
- the dielectric material film layer between the plates 21 is not prone to polarization, the electrostriction condition cannot be achieved, and the mechanical vibration cannot be realized, so that the howling problem can be effectively improved.
- the liquid crystal display panel generally also includes a thin film transistor array layer 14, pixel electrodes (not shown in the figure), and common electrodes (not shown in the figure). Visible), the color film layer 15, the black matrix (not shown in the figure), the first polarizer 16 and the second polarizer 17; among them, the thin film transistor array film layer 14 and the pixel electrode are generally arranged on the first substrate 11.
- the common electrode, the color film layer 15 and the black matrix can be arranged between the first substrate 11 and the liquid crystal layer 13 or between the second substrate 12 and the liquid crystal layer 13.
- the first polarizer 16 It is arranged on the side of the first substrate 11 away from the liquid crystal layer 13, and the second polarizer 17 is arranged on the side of the second substrate 12 away from the liquid crystal layer 13.
- the thin film transistor array film layer generally includes an active layer, a gate insulating layer, a gate layer, an interlayer dielectric layer, a source and drain electrode layer provided in the same layer, a planarization layer, and the like.
- the thin film transistors in the film layer of the thin film transistor array may have a top gate structure or a bottom gate structure, which is not limited herein.
- the color film layer at least includes red, green, and blue color resist units arranged in an array, and the black matrix is arranged between adjacent color resist units.
- the touch electrode 30 may be located between the first substrate 11 and the liquid crystal layer 13.
- the touch electrode can also be located between the second substrate and the liquid crystal layer, which is not limited here.
- the touch electrode 30 may be an electrode layer separately provided on the basis of the liquid crystal display panel, or it may be a common electrode or a pixel electrode in the liquid crystal display panel 10 that is multiplexed as a touch electrode, which is not limited herein.
- the touch display panel provided by the present application, as shown in FIG. 2, it further includes a wire 31 connected to the touch electrode 30 to apply a touch signal to the touch electrode 30 through the wire 31.
- the shield electrode 40 is located between the first substrate 11 and the thin film transistor array film layer 14.
- the shield electrode 40 is located between the first substrate 11 and the first polarizer 16. That is, the shielding electrode 40 is directly arranged on the first substrate, which will not affect the production of other functional film layers in the liquid crystal display panel 10, and thus will not cause defects in the liquid crystal display panel 10.
- the material of the shielding electrode can be a metal material, such as Al, Mg, etc., or a transparent conductive material, such as ITO, etc., which is not limited herein.
- the first substrate 11 has a display area AA and a non-display area BB surrounding the display area AA, as shown in FIG.
- the shielding electrode 40 can be arranged in the display area AA, as shown in FIGS. 8 and 9, or can be arranged in the frame area BB, which is not limited here.
- the shielding electrode 40 when the material of the shielding electrode 40 is a metal material, and when the shielding electrode 40 is located in the display area AA, in order to avoid affecting the display, the shielding electrode 40 can be set as a grid. structure.
- the orthographic projection of the shield electrode of the grid structure on the first substrate is within the orthographic projection range of the black matrix on the first substrate. In this way, by arranging the shielding electrode in the orthographic projection range of the black matrix, it is avoided that the setting of the shielding electrode affects the aperture ratio of the pixels in the panel.
- the shielding electrode 40 is located in the non-display area BB .
- the shield electrode 40 located in the non-display area BB surrounds the display area, that is, the shape of the shield electrode 40 is to surround the display area.
- the ring of area AA in order to increase the area of the shield electrode and the metal back plate 21 directly facing each other, the shield electrode 40 located in the non-display area BB surrounds the display area, that is, the shape of the shield electrode 40 is to surround the display area.
- the shielding electrode 40 in order to increase the facing area of the shielding electrode and the metal back plate 21, when the material of the shielding electrode 40 is a transparent conductive material, the shielding electrode 40 is on the front of the first substrate 11.
- the projection covers the first substrate 11.
- the orthographic projection of the shielding electrode on the first substrate coincides with the orthographic projection of the metal back plate on the first substrate.
- the touch display panel provided by the present application further includes: a driver chip IC, a flexible circuit board FPC, and a printed circuit board PCB, where the printed circuit board PCB is located on the metal back plate 21 facing away from the liquid crystal display On one side of the panel 10, the printed circuit board PCB is electrically connected to the liquid crystal display panel through a flexible circuit board FPC.
- the driving chip IC is located in the frame area of the first substrate 11 for providing driving signals to the display area, or, As shown in FIG. 12, the driver chip IC can also be located on the flexible circuit board FPC.
- one end of the flexible circuit board FPC is bound to the frame area of the first substrate 11, and the other end is bound and connected to the printed circuit board PCB.
- the metal backplane is electrically connected to the ground signal terminal on the printed circuit board.
- the shield electrode 40 may be electrically connected to the ground signal terminal GNDPIN on the flexible circuit board FPC.
- the shield electrode may also be electrically connected to the ground signal terminal on the driving chip, which is not limited herein.
- the shield electrode 40 is located between the first substrate 11 and the first polarizer 16, and the shield electrode 40 is electrically connected to the metal back plate 21 to achieve grounding.
- the shielding electrode 40 is directly arranged on the outside of the substrate of the liquid crystal display panel without changing the setting of the internal film layer of the liquid crystal display panel, and the shielding electrode 40 is electrically connected to the metal back plate 21 to realize the grounding operation is relatively easy to achieve.
- the backlight module 30 may include: a metal back plate 21, a backlight source 22 on the side of the metal back plate 21 facing the liquid crystal display panel 10, a conductive bumper 23, and a flexible Conductive tape 24; where: the metal back plate 21 is used to support the backlight source 22; the conductive pad 23 is located between the backlight source 22 and the shielding electrode 40 and is in direct contact with the shield electrode 40, and the conductive pad 23 is on the first substrate 11
- the orthographic projection of is located in the frame area of the first substrate 11; the two ends of the flexible conductive tape 24 directly contact the conductive pad 23 and the metal back plate 21, respectively.
- the flexible conductive tape may be a conductive Mylar tape.
- the backlight source may be a direct type backlight source or an edge type backlight source, which is not limited herein.
- the backlight 22 may include a backlight circuit board 223, a light guide plate 221, and an LED light source 222 located at the side end of the light guide plate 221, located on the guide
- the light plate 221 faces the reflective layer 224 on the side of the metal back plate 21, and the diffusion layer 225, the lower prism 226 and the upper prism 227 on the side of the light guide plate 221 away from the metal back plate 21.
- the light guide plate 221 is used to transmit light
- the diffusion layer 225 is used to diffuse light, so as to ensure that the backlight module 20 provides a uniform and stable light source to the liquid crystal display panel 10.
- the backlight module 20 further includes a light-shielding glue 25 on the side of the backlight source 22 facing the liquid crystal display panel 10, and the light-shielding glue 25 is located in the frame area.
- the conductive bumper pad 23 is located between the light shielding glue 25 and the liquid crystal display panel 10, and the conductive bumper pad 23 is located on the side of the frame area where the driver chip IC is provided.
- the backlight module also includes other functional devices well known to those skilled in the art, which will not be described in detail here.
- a protective cover 50 is further provided on the side of the liquid crystal display panel 10 facing away from the backlight module 20.
- 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 shielding electrode is much smaller than the pulse width of the touch signal loaded to the touch electrode, so the touch electrode is loaded by the oscilloscope XSC2 as shown in Figure 18 (top)
- the touch signal shown in the figure (rectangular square wave signal), after passing through the RC circuit, the signal waveform output by the oscilloscope XSC1 is shown in Figure 18 (below). It can be seen that the output waveform is a positive-negative sharp pulse signal waveform, which can be It can be seen that after the touch display device of the present application is provided with the shield electrode, the rectangular square wave signal on the touch electrode can be converted into the positive and negative sharp pulse signal on the shield electrode.
- the effect induces equal amounts of positive and negative charges, and the positive and negative charges are neutralized, that is, the electric field induced charge is 0, and the dielectric material film between the shielding electrode and the metal back plate is not prone to polarization and electrostriction
- the conditions cannot be achieved and mechanical vibration cannot be achieved, which can effectively improve the howling problem.
- Improve the use effect of the product improve the howling problem.
- the above-mentioned touch display device provided in the embodiment of the present application may be any product or component with display function, such as a mobile phone, a tablet computer, a TV, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.
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Abstract
本申请公开了一种触控显示装置,包括液晶显示面板、触控电极以及位于所述液晶显示面板入光侧的背光模组,所述背光模组包括金属背板;所述触控显示装置还包括位于所述触控电极面向所述背光模组一侧的屏蔽电极,所述屏蔽电极和所述金属背板均接地;所述触控电极和所述屏蔽电极构成电容,所述电容的电容值和所述屏蔽电极的电阻值之积小于向所述触控电极加载的触控信号的脉宽。
Description
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。
本申请涉及显示装置,尤其涉及一种触控显示装置。
触控显示装置是将触控电极与显示面板相结合,实现触控显示的功能。目前,触控技术在液晶显示装置中的应用十分广泛,液晶显示装置包括液晶显示面板和背光模组,背光模组主要由背光源和金属背板构成。为了消除金属背板表面形成的静电,金属背板接地,而与液晶显示装置结合的触控电极上加载有周期性的高频矩形脉冲信号,这样触控电极和金属背板之间就会形成电容,由于触控电极上的脉冲信号为正电压和负电压交替,触控电极与金属背板之间形成的电场会感生出正电荷或负电荷,使得位于触控电极与金属背板之间的电介质材料膜层产生电致伸缩效应,从而出现弹性形变进而产生振动,当人耳接近的时候可以清晰的听到膜层振动导致的声响,这种现象定义为屏幕啸叫。屏幕啸叫现象会影响产品的使用效果。
发明内容
有鉴于此,本申请实施例提供了一种触控显示装置,具体方案如下:
本申请实施例提供的一种触控显示装置,包括液晶显示面板、触控电极以及位于所述液晶显示面板入光侧的背光模组,所述背光模组包括金属背板;
所述触控显示装置还包括位于所述触控电极面向所述背光模组一侧的屏蔽电极,所述屏蔽电极和所述金属背板均接地;
所述触控电极和所述屏蔽电极构成电容,所述电容的电容值和所述屏蔽电极的电阻值之积小于向所述触控电极加载的触控信号的脉宽。
可选地,在本申请实施例提供的触控显示装置中,所述电容的电容值和所述屏蔽电极的电阻值之积的数量级小于所述触控信号的脉宽的数量级。
可选地,在本申请实施例提供的触控显示装置中,所述液晶显示面板包括:相对设置的第一基板和第二基板,位于所述第一基板和所述第二基板之间的液晶层,所述背光模组位于所述第一基板远离所述第二基板一侧;
所述触控电极位于所述第一基板和所述第二基板之间,或位于所述第二基板背离所述液晶层一侧;
所述屏蔽电极位于所述第一基板面向所述液晶层一侧,或者所述屏蔽电极位于所述第一基板背离所述液晶层一侧。
可选地,在本申请实施例提供的触控显示装置中,所述液晶显示面板还包括:位于所述第一基板面向所述液晶层一侧的薄膜晶体管阵列膜层和位于所述第一基板背离所述液晶层一侧的第一偏光片;
所述屏蔽电极位于所述第一基板与所述薄膜晶体管阵列膜层之间,或者所述屏蔽电极位于所述第一基板与所述第一偏光片之间。
可选地,在本申请实施例提供的触控显示装置中,所述屏蔽电极的材料为金属或者透明导电材料。
可选地,在本申请实施例提供的触控显示装置中,所述第一基板具有显示区域和包围所述显示区域的边框区域,所述屏蔽电极位于所述显示区域,且所述屏蔽电极为网格结构。
可选地,在本申请实施例提供的触控显示装置中,所述液晶显示面板还包括:位于所述第一基板和所述第二基板之间的黑矩阵;
所述屏蔽电极在所述第一基板上的正投影位于所述黑矩阵在所述第一基板上的正投影范围内。
可选地,在本申请实施例提供的触控显示装置中,所述第一基板具有显示区域和包围所述显示区域的非显示区域,所述屏蔽电极位于所述边框区域且包围所述显示区域。
可选地,在本申请实施例提供的触控显示装置中,所述屏蔽电极的材料为透明导电材料,所述屏蔽电极在所述第一基板的正投影覆盖所述第一基板。可选地,在本申请实施例提供的触控显示装置中,还包括:驱动芯片、柔性电路板和印刷电路板,所述驱动芯片位于所述第一基板上或位于所述柔性电路板上,所述印刷电路板位于所述金属背板背离所述液晶显示面板一侧,所述印刷电路板通过所述柔性电路板与所述液晶显示面板电连接;
所述金属背板与所述印刷电路板上的接地信号端电连接。
可选地,在本申请实施例提供的触控显示装置中,所述屏蔽电极位于所述第一基板与所述薄膜晶体管阵列膜层之间,所述屏蔽电极与所述柔性电路板上的接地信号端电连接。
可选地,在本申请实施例提供的触控显示装置中,所述屏蔽电极位于所述第一基板与所述第一偏光片之间,所述屏蔽电极通过与所述金属背板电连接实现接地。
可选地,在本申请实施例提供的触控显示装置中,其中,所述背光模组还包括:位于所述金属背板面向所述液晶显示面板一侧的背光源、导电垫高垫和柔性导电胶带;其中:
所述金属背板用于支撑所述背光源;
所述导电垫高垫位于所述背光源与所述屏蔽电极之间且与所述屏蔽电极直接接触,所述导电垫高垫在所述第一基板的正投影位于所述第一基板的边框区域内;
所述柔性导电胶带的两端分别直接与所述导电垫高垫和所述金属背板接触。
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为本申请实施例提供的触控显示装置的结构示意图之一;
图3为RC微分电路示意图;
图4a为图3对应的RC微分电路的输入信号波形示意图;
图4b为图3对应的RC微分电路的输出信号波形示意图;
图5为本申请实施例提供的触控显示装置的结构示意图之二;
图6为本申请实施例提供的触控显示装置的结构示意图之三;
图7为本申请实施例提供的触控显示装置中屏蔽电极的结构示意图之一;
图8为本申请实施例提供的触控显示装置中屏蔽电极的结构示意图之二;
图9为本申请实施例提供的触控显示装置中屏蔽电极的结构示意图之三;
图10为本申请实施例提供的触控显示装置中屏蔽电极的结构示意图之四;
图11为本申请实施例提供的触控显示装置的结构示意图之四;
图12为本申请实施例提供的触控显示装置的结构示意图之五;
图13为本申请实施例提供的触控显示装置的结构示意图之六;
图14为本申请实施例提供的触控显示装置的结构示意图之七;
图15为本申请实施例提供的触控显示装置的结构示意图之八;
图16为本申请实施例提供的触控显示装置的结构示意图之九;
图17为本申请实施例提供的触控显示装置的仿真电路图;
图18为本申请采用图17仿真得到的波形转换示意图。
为了实现触控产品的Touch功能,IC需要输出调制(modulation)信号(一种高频方波信号)到触控电极上。对于液晶触控显示装置,如图1所示,该液晶触控显示装置包括液晶显示面板1和位于液晶显示面板1入光侧的背光模组2,液晶显示面板1包括阵列基板01、集成在液晶显示面板1内的触控电极02、与各触控电极02电连接的引线03,各引线03电连接至IC,IC电连接至柔性电路板(FPC),触控电极02与触控信号输入端电连接,通过IC 向各触控电极02加载高频矩形脉冲信号;背光模组2包括金属背板04,金属背板04接地。即当产品到模组阶段,组装金属背板04后,金属背板04与触控电极02形成电容。当该电容的两端施加高频的矩形脉冲信号后,触控电极02与金属背板04之间的电介质材料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02加载触控信号时,在交流电场的作用下,触控电极02和金属背板04之间形成的电场(虚线箭头所示)会产生感应电荷,使得位于触控电极02与金属背板04之间的电介质材料膜层产生电致伸缩效应,从而出现弹性形变进而产生振动,当人耳接近的时候可以清晰的听到膜层振动导致的声响,即出现啸叫问题,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,本申请实施例提供了一种触控显示装置,用于解决手机啸叫问题。
为使本申请的上述目的、特征和优点能够更为明显易懂,下面将结合附图和实施例对本申请做进一步说明。然而,示例实施方式能够以多种形式实施,且不应被理解为限于在此阐述的实施方式;相反,提供这些实施方式使得本申请更全面和完整,并将示例实施方式的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的结构,因而将省略对它们的重复描述。本申请中所描述的表达位置与方向的词,均是以附图为例进行的说明,但根据需要也可以做出改变,所做改变均包含在本申请保护范围内。本申请的附图仅用于示意相对位置关系不代表真实比例。
需要说明的是,在以下描述中阐述了具体细节以便于充分理解本申请。但是本申请能够以多种不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本申请内涵的情况下做类似推广。因此本申请不受下面公开的具体实施方式的限制。说明书后续描述为实施本申请的较佳实施方式,然所述描述乃以说明本申请的一般原则为目的,并非用以限定本申请的范围。本申请的保护范围当视所附权利要求所界定者为准。
下面结合附图,对本申请实施例提供的触控显示装置进行具体说明。
本申请实施例提供的一种触控显示装置,如图2所示,包括液晶显示面板(图2中未视出)、触控电极30以及位于液晶显示面板入光侧的背光模组20,背光模组20包括金属背板21;
触控显示装置还包括位于触控电极30面向背光模组20一侧的屏蔽电极40,屏蔽电极40和金属背板21均接地GND;
触控电极30和屏蔽电极40构成电容C,电容C的电容值和屏蔽电极40的电阻值之积小于向触控电极30加载的触控信号的脉宽Tw。
本申请实施例提供的上述触控显示装置,通过在触控电极面向背光模组一侧设置屏蔽电极,而屏蔽电极接地,这样触控电极和屏蔽电极构成电容,该电容和屏蔽电极构成电容C和电阻R的串联结构,电容C的电容值和屏蔽电极40的电阻值之积小于向触控电极30加载的触控信号的脉宽Tw,从而使电容C和电阻R的串联结构形成如图3所示的RC微分电路,其中,u
i(t)表示输入电压,u
0(t)表示输出电压。利用RC微分电路可把矩形脉冲信号转换为尖脉冲信号,从而改变屏蔽电极与金属背板之间的电场形态,使屏蔽电极与金属背板之间的电介质材料膜层在不断变化的电场方向中不容易出现极化,电致伸缩条件无法达成,不能实现机械振动,从而可以有效改善啸叫问题。
具体地,在本申请中,电容的电容值和屏蔽电极的电阻值之积RC表示RC微分电路的时间常数,其中,电容的单位是F(法拉),电阻的单位是Ω(欧姆),时间常数的单位是s(秒)。
在具体实施时,如图4a和图4b所示,触控电极工作时,触控电极上加载的触控信号为矩形脉冲信号,在t1时为高电平,到t2时刻截止(相对呈为低电平),t1至t2之间的时间间隔即为脉宽Tw。在t1时刻,触控电极由低电平变为高电平,由于电容C两端的电压不能突变,所以此时电压u
i(t)全在电阻R两端。随后电容C逐渐充电,电容C两端电压呈指数规律上升,电阻R上的输出电压u
0(t)则按照指数规律下降。屏蔽电极的电阻R越小,RC越小,充电过程越快。在t2时刻,触控电极由高电平变为低电平,电容C开始逐渐放电,电容C两端电压呈指数规律下降。此时电容C通过电阻R反向充电, 电阻R上的输出电压u
0(t)(呈现负压)则按照指数规律上升。在经过一定时间后,电容C放电完毕,电阻R上的输出电压u
0(t)变为0。屏蔽电极的电阻越小,RC越小,放电过程越快。
具体地,如果触控信号的脉宽Tw比较小,那么电容C在没有充满的情况下就会放电,或者在没有放完的情况下就进行了充电,输出波形就不是理想的尖脉冲波。因此为了将触控电极上的触控信号经过RC微分电路转换后变为尖脉冲信号,该尖脉冲信号的宽度与RC有关(即电路的时间常数),RC越小,尖脉冲信号越尖,反之则宽。要满足RC微分电路,RC必须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。本申请利用RC微分电路将触控电极上的同向矩形脉冲信号转换为屏蔽电极上的正负向尖脉冲信号,从而改变屏蔽电极与金属背板之间的电场形态,使屏蔽电极与金属背板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,从而屏蔽电极与金属背板之间的电介质材料膜层不容易出现极化,电致伸缩条件无法达成,不能实现机械振动,从而可以有效改善啸叫问题。
在具体实施时,可选取电容的电容值和屏蔽电极的电阻值之积RC=1/10Tw,例如,触控电极上加载的触控信号的脉宽Tw在100μs~200μs之间,那么可以设置电容的电容值和屏蔽电极的电阻值之积RC在10μs~20μs之间,在此不作限定。
在具体实施时,在本申请中,如图5和图6所示,背光模组20一般还包括位于金属背板21面向液晶显示面板10一侧的背光源22,金属背板21用于支撑背光源22。进一步地,金属背板21一般采用铁形成,金属背板21接地是为了消除金属背板21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触控信号的脉宽Tw,搭配串联不同阻值的屏蔽电极形成RC微分电路,保证屏蔽电极与触控电极构成的电容C满足RC微分电路的关系。为了满足RC<<Tw,可以使电容C的电容值和电阻R的电阻值之积的数量级小于触控 信号的脉宽Tw的数量级,以实现RC微分电路波形变换的作用。一般RC小于或等于触控信号的脉宽Tw的1/10就可以满足要求。
本申请提供的触控显示装置,如图5和图6所示,液晶显示面板10包括:相对设置的第一基板11和第二基板12,位于第一基板11和第二基板12之间的液晶层13,背光模组20位于第一基板11远离第二基板12一侧。
本申请实施例提供的触控显示装置,可以适用于外挂式触摸屏(Add on Mode Touch Panel)、覆盖表面式触摸屏(On Cell Touch Panel)或内嵌式触摸屏(In Cell Touch Panel),在此不作限定。
在具体实施时,外挂式触摸屏将触控电极与液晶显示面板分开生产,然后再将触控电极贴合在液晶显示面板的出光侧。覆盖表面式触摸屏是将触控电极直接形成在液晶显示面板的出光侧。在这两种触摸屏中,触控电极是位于第二基板背离液晶层一侧,触控电极与金属背板的距离比较大,触控电极与金属背板形成的电容较小,因此啸叫现象不太明显,但是如果有啸叫现象出现,本申请同样可以解决。
而内嵌式触摸屏是将触控电极内嵌在液晶显示面板内部,触控电极位于第一基板和第二基板之间,触控电极与金属背板的距离比较小,触控电极与金属背板形成的电容较大,因此最容易出现啸叫现象,因此本申请提供的触控显示装置尤为适用于内嵌式触摸屏。
在本申请中,如图5所示,可以将屏蔽电极40设置在第一基板11面向液晶层13一侧,或者如图6所示,将屏蔽电极40设置在第一基板11背离液晶层13一侧。利用触控电极30和屏蔽电极40形成的RC微分电路将触控电极30上的同向矩形脉冲信号转换为屏蔽电极40上的正负向尖脉冲信号,从而改变屏蔽电极40与金属背板21之间的电场形态,使屏蔽电极40与金属背板21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,屏蔽电极40与金属背板21之间的电介质材料膜层不容易出现极化,电致伸缩条件无法达成,不能实现机械振动,从而可以有效改善啸叫问题。
在本申请提供的触控显示装置中,如图5和图6所示,液晶显示面板中 一般还包括薄膜晶体管阵列膜层14、像素电极(图中未视出)、公共电极(图中未视出)、彩膜层15、黑矩阵(图中未视出)、第一偏光片16和第二偏光片17;其中,薄膜晶体管阵列膜层14和像素电极一般均设置在第一基板11与液晶层13之间,公共电极、彩膜层15和黑矩阵可以设置在第一基板11与液晶层13之间也可以设置在第二基板12与液晶层13之间,第一偏光片16设置在第一基板11背离液晶层13一侧,第二偏光片17设置在第二基板12背离液晶层13一侧。
具体地,薄膜晶体管阵列膜层一般包括有源层、栅极绝缘层、栅极层、层间介质层、同层设置的源漏电极层以及平坦化层等。薄膜晶体管阵列膜层中薄膜晶体管可以是顶栅型结构也可以是底栅型结构,在此不作限定。彩膜层至少包括阵列排布的红、绿、蓝三色色阻单元,黑矩阵设置于相邻色阻单元之间。
下面以应用于内嵌式触摸屏为例,对本申请的触控显示装置进行详细的说明。
具体地,如图5和图6所示,触控电极30可以位于第一基板11和液晶层13之间。当然触控电极也可以位于第二基板和液晶层之间,在此不作限定。
进一步地,触控电极30可以是在液晶显示面板基础上单独设置的一层电极层,也可以是由液晶显示面板10中的公共电极或者像素电极复用为触控电极,在此不作限定。
进一步地,在本申请提供的触控显示面板中,如图2所示,还包括与触控电极30连接的导线31,以通过导线31向触控电极30施加触控信号。
可选地,在本申请提供的触控显示装置中,如图5所示,屏蔽电极40位于第一基板11与薄膜晶体管阵列膜层14之间。或者,如图6所示,屏蔽电极40位于第一基板11与第一偏光片16之间。即将屏蔽电极40直接设置在第一基板上,不会影响液晶显示面板10内其它功能性膜层的制作,从而不会导致液晶显示面板10的不良。
在本申请提供的触控显示装置中,屏蔽电极的材料可以为金属材料,例 如Al、Mg等,也可以为透明导电材料,例如ITO等,在此不作限定。
在具体实施时,在本申请实施例提供的上述触控显示装置中,如图7至图9所示,第一基板11具有显示区域AA和包围显示区域AA的非显示区域BB,如图7所示,屏蔽电极40可以设置于显示区域AA,如图8和图9所示,也可以设置于边框区域BB,在此不作限定。
可选地,在本申请中,如图7所示,当屏蔽电极40的材料为金属材料时,且当屏蔽电极40位于显示区域AA时,为了避免影响显示,屏蔽电极40可以设置为网格结构。
进一步地,网格结构的屏蔽电极在第一基板上的正投影位于黑矩阵在第一基板上的正投影范围内。这样通过将屏蔽电极设置在黑矩阵的正投影范围内,避免屏蔽电极的设置影响面板内像素的开口率。
在具体实施时,为了进一步防止屏蔽电极的设置会使液晶显示面板出现其它不良问题,在本申请实施例提供的上述触控显示装置中,如图8所示,屏蔽电极40位于非显示区域BB。
进一步地,在本申请中,如图9所示,为了增加屏蔽电极与金属背板21的正对面积,位于非显示区域BB的屏蔽电极40包围显示区域,即屏蔽电极40的形状为包围显示区域AA的环形。
可选地,在本申请中,如图10所示,为了增加屏蔽电极与金属背板21的正对面积,屏蔽电极40的材料为透明导电材料时,屏蔽电极40在第一基板11的正投影覆盖第一基板11。
或者,可选地,在本申请中,屏蔽电极在第一基板的正投影与金属背板在第一基板上的正投影重合。
本申请提供的触控显示面板中,如图11和图12所示,还包括:驱动芯片IC、柔性电路板FPC和印刷电路板PCB,其中,印刷电路板PCB位于金属背板21背离液晶显示面板10的一侧,印刷电路板PCB通过柔性电路板FPC与液晶显示面板电连接,如图11所示,驱动芯片IC位于第一基板11的边框区域用于向显示区域提供驱动信号,或者,如图12所示,驱动芯片IC也可 以位于柔性电路板FPC上。
在具体实施时,如图11和图12所示,柔性电路板FPC一端绑定在第一基板11的边框区域,另一端与印刷电路板PCB绑定连接。
在具体实施时,在本申请中,金属背板与印刷电路板上的接地信号端电连接。
在具体实施时,如图13所示,屏蔽电极40可以与柔性电路板FPC上的接地信号端GND PIN电连接。或者,在具体实施时,屏蔽电极也可以与驱动芯片上的接地信号端电连接,在此不作限定。
可选地,在本申请中,如图14至图16所示,屏蔽电极40位于第一基板11与第一偏光片16之间,屏蔽电极40通过与金属背板21电连接实现接地。这样不用改变液晶显示面板内部膜层的设置直接在液晶显示面板的基板外侧屏蔽电极40,并且,屏蔽电极40通过与金属背板21电连接实现接地操作比较容易实现。
在具体实施时,如图14和图15所示,背光模组30可以包括:金属背板21、位于金属背板21面向液晶显示面板10一侧的背光源22、导电垫高垫23和柔性导电胶带24;其中:金属背板21用于支撑背光源22;导电垫高垫23位于背光源22与屏蔽电极40之间且与屏蔽电极40直接接触,导电垫高垫23在第一基板11的正投影位于第一基板11的边框区域内;柔性导电胶带24的两端分别直接与导电垫高垫23和金属背板21接触。
在具体实施时,在本申请中,柔性导电胶带可以为导电性麦拉胶带。
可选地,在本申请中,背光源可以为直下式背光源,也可以为侧入式背光源,在此不作限定。
具体地,以背光源为侧入式背光源为例,如图14和图15所示,背光源22可以包括背光电路板223,导光板221,位于导光板221侧端的LED光源222,位于导光板221面向金属背板21一侧的反射层224,位于导光板221远离金属背板21一侧的扩散层225、下棱镜226和上棱镜227。导光板221用于传导光线,扩散层225用于扩散光线,以保证背光模组20向液晶显示面板 10提供均匀稳定的光源。
进一步,在本申请中,如图14至图16所示,背光模组20中还包括位于背光源22面向液晶显示面板10一侧的遮光胶25,且遮光胶25位于边框区域。导电垫高垫23位于遮光胶25与液晶显示面板10之间,且导电垫高垫23位于边框区域设置有驱动芯片IC一侧。
当然,在具体实施时,背光模组还包括本领域技术人员熟知的其它功能性器件,在此不做详述。
在具体实施时,如图14和图15所示,在本申请中,在液晶显示面板10背离背光模组20一侧还设置有保护盖板50。
下面对本申请实施例提供的触控显示装置增加的屏蔽电极与金属背板接地之后的波形进行仿真,具体地,如图17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的电容值和屏蔽电极的电阻值之积远小于向触控电极加载的触控信号的脉宽,这样通过示波器XSC2给触控电极加载如图18(上)所示的触控信号(矩形方波信号),经过RC电路之后,示波器XSC1输出的信号波形如图18(下)所示,可以看出输出的波形为正负向尖脉冲信号波形,由此可以看出,本申请的触控显示装置设置屏蔽电极之后,可以使触控电极上的矩形方波信号转换为屏蔽电极上的正负向尖脉冲信号,屏蔽电极和金属背板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,屏蔽电极与金属背板之间的电介质材料膜层不容易出现极化,电致伸缩条件无法达成,不能实现机械振动,从而可以有效改善啸叫问题。提高产品的使用效果。
本申请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。
显然,本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样,倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内,则本申请也意图包含这些改动和变型在内。
Claims (13)
- 一种触控显示装置,其中,包括液晶显示面板、触控电极以及位于所述液晶显示面板入光侧的背光模组,所述背光模组包括金属背板;所述触控显示装置还包括位于所述触控电极面向所述背光模组一侧的屏蔽电极,所述屏蔽电极和所述金属背板均接地;所述触控电极和所述屏蔽电极构成电容,所述电容的电容值和所述屏蔽电极的电阻值之积小于向所述触控电极加载的触控信号的脉宽。
- 如权利要求1所述的触控显示装置,其中,所述电容的电容值和所述屏蔽电极的电阻值之积的数量级小于所述触控信号的脉宽的数量级。
- 如权利要求2所述的触控显示装置,其中,所述液晶显示面板包括:相对设置的第一基板和第二基板,位于所述第一基板和所述第二基板之间的液晶层,所述背光模组位于所述第一基板远离所述第二基板一侧;所述触控电极位于所述第一基板和所述第二基板之间,或位于所述第二基板背离所述液晶层一侧;所述屏蔽电极位于所述第一基板面向所述液晶层一侧,或者所述屏蔽电极位于所述第一基板背离所述液晶层一侧。
- 如权利要求3所述的触控显示装置,其中,所述液晶显示面板还包括:位于所述第一基板面向所述液晶层一侧的薄膜晶体管阵列膜层和位于所述第一基板背离所述液晶层一侧的第一偏光片;所述屏蔽电极位于所述第一基板与所述薄膜晶体管阵列膜层之间,或者所述屏蔽电极位于所述第一基板与所述第一偏光片之间。
- 如权利要求3或4所述的触控显示装置,其中,所述屏蔽电极的材料为金属或者透明导电材料。
- 如权利要求5所述的触控显示装置,其中,所述第一基板具有显示区域和包围所述显示区域的边框区域,所述屏蔽电极位于所述显示区域,且所述屏蔽电极为网格结构。
- 如权利要求6所述的触控显示装置,其中,所述液晶显示面板还包括:位于所述第一基板和所述第二基板之间的黑矩阵;所述屏蔽电极在所述第一基板上的正投影位于所述黑矩阵在所述第一基板上的正投影范围内。
- 如权利要求5所述的触控显示装置,其中,所述第一基板具有显示区域和包围所述显示区域的非显示区域,所述屏蔽电极位于所述边框区域且包围所述显示区域。
- 如权利要求5所述的触控显示装置,其中,所述屏蔽电极的材料为透明导电材料,所述屏蔽电极在所述第一基板的正投影覆盖所述第一基板。
- 如权利要求4所述的触控显示装置,其中,还包括:驱动芯片、柔性电路板和印刷电路板,所述驱动芯片位于所述第一基板上或位于所述柔性电路板上,所述印刷电路板位于所述金属背板背离所述液晶显示面板一侧,所述印刷电路板通过所述柔性电路板与所述液晶显示面板电连接;所述金属背板与所述印刷电路板上的接地信号端电连接。
- 如权利要求10所述的触控显示装置,其中,所述屏蔽电极位于所述第一基板与所述薄膜晶体管阵列膜层之间,所述屏蔽电极与所述柔性电路板上的接地信号端电连接。
- 如权利要求10所述的触控显示装置,其中,所述屏蔽电极位于所述第一基板与所述第一偏光片之间,所述屏蔽电极通过与所述金属背板电连接实现接地。
- 如权利要求12所述的触控显示装置,其中,所述背光模组还包括:位于所述金属背板面向所述液晶显示面板一侧的背光源、导电垫高垫和柔性导电胶带;其中:所述金属背板用于支撑所述背光源;所述导电垫高垫位于所述背光源与所述屏蔽电极之间且与所述屏蔽电极直接接触,所述导电垫高垫在所述第一基板的正投影位于所述第一基板的边框区域内;所述柔性导电胶带的两端分别直接与所述导电垫高垫和所述金属背板接触。
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CN111796716A (zh) * | 2020-06-28 | 2020-10-20 | 上海创功通讯技术有限公司 | 触控显示屏、触控显示屏的啸声消除方法及电子设备 |
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CN112947785B (zh) * | 2021-02-08 | 2022-11-25 | 武汉华星光电技术有限公司 | 触控显示装置及其背光模组 |
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