Computer touch input device

Abstract

The present invention discloses a computer touch input device, comprising: a capacitive signal processing circuit, a pressure touch film main layer and an insulating covering layer located on the surface of the pressure touch film main layer; the pressure touch film main layer comprises a pressure signal power supply layer, an interference shielding and electric signal transmission layer and a capacitive signal receiving layer which are stacked in sequence; the pressure signal power supply layer is used to convert the pressure signal received and transmitted by the insulating covering layer into an electric signal; the interference shielding and electric signal transmission layer is used to shield the interference of the pressure signal power supply layer in the area without pressure signal, and transmit the electric signal to the capacitive signal receiving layer in the area with pressure signal; the capacitive signal receiving layer is used to receive the electric signal to form a capacitive touch signal, and transmit the capacitive touch signal to the capacitive signal processing circuit. The present invention is a touch input device that can be set on a display screen, which supports both multi-point pressure input and multi-point capacitive touch input, and makes the screen more transparent, simple in circuit structure, reduced in volume and reduced in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of computer information input devices, mainly to the field of input devices such as tablet computers, folding screen mobile phone screens, and in particular to a computer touch input device with two functions of multi-point pressure touch and multi-point capacitive touch. Background Art

[0002] When people use existing tablet computers, foldable screen mobile phones and other devices to input information, in addition to lightly touching the screen with their fingers, they also hope to be able to freely input information on the screen with a pen.

[0003] The current technical methods include manufacturing and using a dedicated electronic (capacitive) pen, using a resistive screen, adding a transparent piezoresistive layer or piezoelectric sensing layer to the touch screen to sense the pressure changes applied to the screen. Another method is to set a pressure sensor under the display screen to sense the pressure on the screen. Or use an electromagnetic pen and add an electromagnetic sensing layer under the screen.

[0004] Using a dedicated electronic capacitive pen is inconvenient to carry, and you cannot use other ordinary pens to input without it. Using a resistive screen, in addition to the finger touch, it is difficult to support multiple pens to write and input at the same time, which is very inconvenient. Adding a transparent piezoresistive layer or a piezoelectric sensing layer to the touch screen not only makes the transparent piezoresistive layer or the piezoelectric sensing layer more expensive, but also makes it always more laborious to touch with a finger. In addition, the addition of the transparent piezoresistive layer or the piezoelectric sensing layer makes the screen transparency extremely poor. As for the pressure touch screen with a pressure sensor under the display screen, the signal acquisition circuit becomes extremely complicated due to the pressure sensor, and many processing chips are required, which greatly increases the size of the tablet computer and folding screen mobile phone, causing inconvenience to the user and increasing the cost.

[0005] Therefore, how to provide a computer touch input device that supports multi-point pressure input and multi-point capacitive touch input without increasing the size of devices such as tablet computers and foldable screen mobile phones is a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] In view of the above research status, the present invention provides a computer touch input device, which can be set on a display screen. It can use multiple arbitrary hard pens (or hard objects) to perform multi-point pressure input on the screen, and can also use multiple fingers to gently touch to perform multi-point capacitive touch input, that is, it supports both multi-point pressure input and multi-point capacitive touch input, and makes the screen more transparent, simple in circuit structure, and reduces the size of tablet computers and mobile phones or greatly reduces costs.

[0007] A computer touch input device provided by the present invention comprises: a capacitive signal processing circuit, a pressure touch film main layer and an insulating covering layer located on the surface of the pressure touch film main layer; the pressure touch film main layer comprises a pressure signal power supply layer, an interference shielding and electrical signal transmission layer and a capacitive signal receiving layer which are stacked in sequence, wherein:

[0008] A pressure signal power supply layer, used for converting the pressure signal received and transmitted by the insulating covering layer into an electrical signal;

[0009] An interference shielding and electrical signal transmission layer, used for shielding the interference of the pressure signal power supply layer in the area without pressure signal, and transmitting the electrical signal to the capacitive signal receiving layer in the area with pressure signal;

[0010] The capacitive signal receiving layer is used to receive the electrical signal to form a capacitive touch signal, and transmit the capacitive touch signal to the capacitive signal processing circuit.

[0011] Preferably, the insulating covering layer is a sheet structure with a certain hardness, stiffness, elasticity and toughness, and has the characteristic that when one side is subjected to point pressure, the other side transmits pressure to the lower layer in the state of surface pressure. If the layers bonded to the other side are provided with dispersed support points between the layers bonded to the lower structure, under the action of pressure and support points as well as its own stiffness and elasticity, the layers bonded to the insulating covering layer itself will show a certain area of ​​curvature. If the layers bonded to the other side are in direct contact with the lower structure, they will show a certain area of ​​surface contact rather than point contact.

[0012] Preferably, the interlayer structures of the main layer of the pressure touch film include:

[0013] The capacitive signal receiving layer includes a capacitive touch screen protection layer 1, a flexible multi-point capacitive touch screen layer and a capacitive touch screen protection layer 2 which are stacked in sequence;

[0014] The interference shielding and electrical signal transmission layer includes a plurality of spacer point layers 1, a conductive and shielding film layer and a plurality of spacer point layers 2 which are stacked in sequence; the plurality of spacer point layers 1 are arranged adjacent to the capacitive touch screen protection layer 2; an air layer is formed between the spacer point layer 1 and a plurality of spacer points attached to the spacer point layer 2, and the spacer point layer 1 is used to isolate the capacitive touch screen protection layer 2 from the conductive and shielding film layer in a pressure-free state; the conductive and shielding film layer is used to shield the interference of the power conductive film layer in a pressure-free signal area, and transmit the electrical signal of the power conductive film layer in a pressure signal area;

[0015] The pressure signal power supply layer includes a power supply conductive film layer and a substrate film layer which are stacked in sequence; the power supply conductive film layer is arranged adjacent to the plurality of spacer layer 2s, and the spacer layer 2s are used to isolate the conductive and shielding film layer from the power supply conductive film layer in a pressure-free state; the power supply conductive film layer is a conductive film which is conductive to the power supply electrode.

[0016] Preferably, the adjacent order between the pressure signal power supply layer, the interference shielding and electrical signal transmission layer and the capacitive signal receiving layer of the pressure touch film main layer is kept unchanged, and the pressure touch film main layer is positively arranged on the bottom layer of the insulating covering layer, or the pressure touch film main layer is invertedly arranged on the bottom layer of the insulating covering layer.

[0017] Preferably, the pressure touch film main layer is arranged on the display screen surface, and each layer structure of the pressure touch film main layer and the insulating covering layer are made of transparent materials; the conductive and shielding film layer is an overall conductive transparent conductive film and is connected to the ground wire.

[0018] Preferably, the main layer of the pressure touch film is arranged on the bottom surface of the display screen, the insulating covering layer is arranged on the surface of the display screen and is made of a transparent material, and the display screen is a flexible display screen; an anti-interference shielding layer is arranged on the surface and the bottom surface of the main layer of the pressure touch film, which is used to shield the capacitive interference and electromagnetic interference between the main layer of the pressure touch film and the display screen and the capacitive signal processing circuit.

[0019] Preferably, a flexible capacitive touch screen is provided between the display screen and the insulating covering layer.

[0020] Preferably, the anti-interference shielding layer includes a fully covered conductive film layer or a multi-layer circuit board; the surface of each layer of the circuit board is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, and the independent conductive shielding units between each layer of the circuit board are staggered with each other, and the insulating gaps between the independent conductive shielding units of each layer of the circuit board in the vertical direction of the stacking are all covered by the shielding.

[0021] Preferably, the interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer is made of a multi-layer rigid circuit board or a multi-layer flexible circuit board that meets the vertical deformation requirements; wherein,

[0022] Each layer of rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of rigid circuit board are staggered and distributed with each other, and the insulating gaps between the independent conductive shielding units of each layer of rigid circuit board in the vertical direction of the stacking are all shielded and covered, so as to shield the electromagnetic interference passing through the insulating gaps of the independent conductive shielding units in each layer of rigid circuit board; the independent conductive shielding units corresponding to the top rigid circuit board and the bottom rigid circuit board are electrically connected by vias, so as to transmit the electrical signal of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked by metal to shield the capacitive interference and electromagnetic interference passing through the vias;

[0023] Each layer of flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of flexible circuit boards are staggered and distributed with each other, and the insulating gaps between the independent conductive shielding units of each layer of flexible circuit boards in the vertical direction of the stacking are all shielded and covered, so as to shield the electromagnetic interference passing through the insulating gaps of the independent conductive shielding units in each layer of flexible circuit boards; the independent conductive shielding units corresponding to the top flexible circuit board and the bottom flexible circuit board are electrically connected by vias, so as to transmit the electrical signal of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked by metal to shield the capacitive interference and electromagnetic interference passing through the vias;

[0024] The independent conductive shielding unit is made of a conductive material with a conductivity coefficient greater than a set threshold.

[0025] Preferably, the display screen is a foldable display screen; the interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer adopts a soft-hard combination circuit board that meets the vertical deformation requirements;

[0026] The hard-soft combined circuit board comprises a multi-layer rigid circuit board connected by a multi-layer flexible circuit board; each layer of the rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, and the independent conductive shielding units between the multi-layer rigid circuit boards are staggered, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the stacking are all shielded and covered, and the independent conductive shielding units corresponding to the top layer of the rigid circuit board and the bottom layer of the rigid circuit board are electrically connected through vias; the multi-layer flexible circuit board is located in the folding area, and a groove is provided on one side edge of the rigid circuit board of the middle layer, and the edge of the flexible circuit board is inserted into the groove to fix the flexible circuit board; the independent conductive shielding units in the rigid circuit boards of the remaining layers are staggered in the vertical direction of the groove, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the groove are all shielded and covered; the multi-layer flexible circuit board is a multi-layer circuit board, and each layer of the flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other;

[0027] The independent conductive shielding unit is made of a conductive material with a conductivity coefficient greater than a set threshold.

[0028] Preferably, the interference shielding layer and the spacer layer in the main layer of the pressure touch film and the electrical signal transmission layer is a thin air layer supported by spacers or other supports, which plays the role of insulation, isolation of signals and attenuation of interference signals. The spacers are generally made of transparent ultraviolet light curing glue (UV glue), attached to the flexible film layer, and distributed at a certain interval.

[0029] Preferably, the computer touch input device is arranged as a pad at the bottom of the paper, and the insulating covering layer is used to receive and transmit the pressure signal generated by the pen writing on the paper; wherein,

[0030] The computer touch input device comprises the insulating covering layer, the pressure touch film main layer and the anti-interference shielding layer stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with a pressure signal power supply layer, the interference shielding and electrical signal transmission layer, and the capacitive signal receiving layer; or,

[0031] The computer touch input device includes the insulating covering layer, the anti-interference shielding layer 1, the pressure touch film main layer and the anti-interference shielding layer 2 which are stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with the capacitive signal receiving layer, the interference shielding and electrical signal transmission layer, and the pressure signal power supply layer.

[0032] The computer touch input device proposed by the present invention has the following beneficial effects compared with the prior art:

[0033] (1) The present invention is based on a flexible capacitive touch screen (film) as a signal receiving device. Through touch pressure, the corresponding positions of the layers set inside the screen are brought close to and in contact with each other, and the multi-point pressure signals are converted into electrical signals that can be received by the capacitive screen in the screen. The touch signals are transmitted to the capacitive screen set in the screen to realize the conversion of pressure signals into capacitive signals and input them into the computer. In addition, the capacitive screen set in the touch device can receive capacitive input signals such as finger touch.

[0034] (2) When the touch screen is set on the outer surface of the display screen using this transparent structure, the cost is greatly reduced. The two touch modes of finger touch and pressure touch can use a flexible multi-point capacitive touch screen and chip as an electrical signal receiving device. Compared with other similar products that support both capacitive touch and pressure touch input modes, which must use more than two signal receiving devices outside the display screen (between the line of sight and the display screen) (one capacitive screen and chip are used to receive finger touch signals, and the other receiving screen and chip are used to receive pressure touch signals), the cost is greatly reduced. In addition to the flexible capacitive touch screen, the touch screen only needs to add at least 2 layers of transparent conductive film. Compared with similar product structures that must add a pressure signal receiving screen and a dielectric layer in addition to the capacitive screen, the transparency is greatly improved. The cost is greatly reduced and the transparency performance is greatly improved.

[0035] (3) When this touch input device is used with an ultra-thin flexible display screen, since the main layer of the pressure touch screen (film) of this solution is set behind the flexible ultra-thin display screen, and the front part of the ultra-thin flexible display screen only has the commonly used flexible multi-point capacitive touch screen, it has the highest transparency among similar products that support two touch functions (capacitive touch and pressure touch). The pressure touch device layer is not set in front of the display screen. At the same time, since the flexible capacitive touch screen under the flexible display screen only uses one centralized control chip, it greatly reduces the space volume and huge cost compared to the pressure resistance film touch screen that uses many pressure signal acquisition control chip circuits. It is used in tablet computers, folding tablet computers, folding screen mobile phones, etc. that pay more attention to thin thickness and small size. It is lighter, more convenient, cheaper, and more transparent. This touch input device solution can be used for multi-point finger touch input and multi-point arbitrary hard pen pressure input.

[0036] (4) To realize the natural placement of the palm on the screen and writing content on the screen with any hard pen, an excellent screen hardware foundation is provided. The touch input device can also be used as a pad and a pressure input device placed under the paper, and the content written on the paper with the hard pen can be input into the computer at the same time through the pressure of the pen tip. While realizing the above functions, the present invention does not increase or only increases one capacitive signal processing circuit, reduces the size of the tablet computer and mobile phone or greatly reduces the cost, and meets the higher requirements of modern products. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work.

[0038] Figure 1 A schematic structural diagram of a main layer of a pressure touch film of a computer touch input device provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a concave area of ​​an insulating covering layer under pen tip pressure provided by an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the structure of a flexible multi-point capacitive touch screen sensing unit layer provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the arrangement position relationship of the main layer of the pressure touch film made in a fully transparent manner provided by an embodiment of the present invention;

[0042] Figure 5 A schematic diagram of the structure of each layer of a computer touch input device made in a fully transparent manner provided by an embodiment of the present invention;

[0043] Figure 6 A schematic diagram of the structure of an interference shielding and electrical signal transmission layer and a pressure signal power supply layer made in a fully transparent manner provided in an embodiment of the present invention;

[0044] Figure 7 A cross-sectional view of the states of each layer of a computer touch input device provided by an embodiment of the present invention, which is made in a fully transparent manner when subjected to a pressure signal from a screen surface;

[0045] Figure 8 A schematic diagram of a structure in which a conductive and shielding film layer wraps a transparent annular conductive layer provided in an embodiment of the present invention;

[0046] Fig. 9 A cross-sectional view of a computer touch input device having a transparent annular conductive and shielding film layer in the interference shielding and electrical signal transmission layer B provided by an embodiment of the present invention when receiving a pressure signal;

[0047] Fig.10 A schematic diagram of a spacer layer structure provided in an embodiment of the present invention;

[0048] Fig.11 A schematic diagram of a structure in which a main layer of a pressure touch film provided in an embodiment of the present invention is disposed behind a flexible display screen;

[0049] Fig.12A schematic diagram of the cross-sectional structure of an anti-interference shielding layer provided in an embodiment of the present invention;

[0050] Fig.13 A cross-sectional view of an anti-interference shielding layer provided in an embodiment of the present invention;

[0051] Fig.14 A schematic cross-sectional view of a three-layer flexible circuit board with staggered positions of the first and last independent conductive shielding units of the conductive and shielding film layers in the interference shielding and signal transmission layer provided by an embodiment of the present invention;

[0052] Fig.15 A schematic diagram of a conductive via connection method for blind vias and buried vias in a multi-layer circuit board provided by an embodiment of the present invention;

[0053] Fig.16 A schematic diagram of the structure of the flexible folding display screen touch control device provided by an embodiment of the present invention in a state of receiving pressure;

[0054] Fig.17 A schematic diagram of the structure of a computer touch input device in which the main layer of the pressure touch film provided in an embodiment of the present invention is arranged behind a flexible folding display screen;

[0055] Fig.18 A structural cross-sectional view of a multi-layer rigid circuit board connected by a flexible circuit board in a flexible foldable display screen provided by an embodiment of the present invention;

[0056] Fig.19 A structural cross-sectional view of a flexible circuit board in a flexible folding display screen provided by an embodiment of the present invention;

[0057] Fig. 20 A schematic diagram of a spacer layer structure in a flexible folding display screen provided by an embodiment of the present invention;

[0058] Fig.21 A schematic diagram of a narrow slit region within a capacitive signal sensing region in a flexible foldable display screen provided by an embodiment of the present invention;

[0059] Fig. 22 A partial top view of the first layer of a multi-layer circuit board provided by an embodiment of the present invention;

[0060] Fig.23 A partial top view of the second layer of a multi-layer circuit board provided by an embodiment of the present invention;

[0061] Fig.24 A partial top view of the third layer of a multi-layer circuit board provided by an embodiment of the present invention;

[0062] Fig.25 A schematic diagram of the three-dimensional structure of a multi-layer circuit board provided by an embodiment of the present invention;

[0063] Fig.26A cross-sectional view of a multi-layer circuit board provided by an embodiment of the present invention;

[0064] Fig. 27 A schematic diagram of the interference signal shielding structure at the intersection of the insulating fine lines of the conductive and shielding film layer of the flexible circuit board in the interference shielding and signal transmission layer provided by the embodiment of the present invention;

[0065] Fig.28 A schematic diagram of a conductive via connection method between the first layer and the fourth layer of a multi-layer circuit board provided by an embodiment of the present invention;

[0066] Fig.29 A schematic diagram of the structure of a pressure touch panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] The present invention provides a computer touch input device, comprising: a capacitive signal processing circuit, a pressure touch film main layer and an insulating covering layer located on the surface of the pressure touch film main layer; the pressure touch film main layer comprises a pressure signal power supply layer, an interference shielding and electrical signal transmission layer and a capacitive signal receiving layer which are stacked in sequence, wherein: the pressure signal power supply layer is used to convert the pressure signal received and transmitted by the insulating covering layer into an electrical signal; the interference shielding and electrical signal transmission layer is used to shield the interference of the pressure signal power supply layer in an area without pressure signals and transmit electrical signals in an area with pressure signals; the capacitive signal receiving layer is used to receive electrical signals to form capacitive touch signals and transmit the capacitive touch signals to the capacitive signal processing circuit.

[0069] It should be noted that the insulating covering layer is a sheet-like transparent structure with a high dielectric constant, insulation, stiffness, certain hardness and elastic toughness, which is provided on the surface of the screen, etc. It can receive and disperse the pressure signal of the pen tip and other points on the screen surface, and convert it into a small area pressure signal near the force point for downward transmission. It can also have the function of transmitting the capacitive signal such as the finger touch received on the screen surface to the lower layer, and is generally made of plastic or flexible glass. The main layer of the pressure touch film converts the pressure signal transmitted from the insulating covering layer into a capacitive signal that can be received by the capacitive screen provided in the main layer of the pressure touch film.

[0070] like Figure 1 As shown, the functional layers of the main layer of the pressure touch film are:

[0071] A capacitive signal receiving layer A comprising a flexible multi-point capacitive touch screen (film);

[0072] The interference shielding and electrical signal transmission layer B sandwiched between the capacitive signal receiving layer A and the pressure signal power supply layer C is used to shield the interference electrical signal when there is no pressure. When only the touch signal of the finger is received, the interference shielding and electrical signal transmission layer B also plays the role of shielding the interference electrical signal. When the pressure is applied, the interference shielding and electrical signal transmission layer B is close to and in contact with the adjacent capacitive signal receiving layer A and the pressure signal power supply layer C near the pressure point, and transmits the electrical signal in the near contact area; in the non-contact area, it plays the role of shielding the interference electrical signal.

[0073] A pressure signal power supply is provided, which includes a pressure signal power supply layer C consisting of an electrode plate fully charged and connected to a power supply electrode.

[0074] In one embodiment, the insulating covering layer is a sheet structure with a certain hardness, stiffness, elasticity and toughness. It has the characteristics of transmitting pressure to the lower layer in the state of surface pressure on the other side when one side is subjected to point pressure. If the layers bonded on the other side are provided with dispersed support points between the lower structure, the layers bonded to the insulating covering layer will bend in a certain area under the pressure and support points and its own stiffness and elasticity. If the layers bonded on the other side are in direct contact with the lower structure, they will be in surface contact of a certain area rather than point contact. The insulating covering layer also has the function of transmitting capacitance signals such as finger touch received on the surface to the lower layer, such as Figure 2 As shown, M represents the insulating covering layer, and the shaded portion represented by N is the nearly circular portion of the insulating covering layer that is recessed downward under the pressure of the pen tip.

[0075] In one embodiment, the interlayer structures of the main layer of the pressure touch film include:

[0076] The capacitive signal receiving layer includes a capacitive touch screen protection layer 1, a flexible multi-point capacitive touch screen layer and a capacitive touch screen protection layer 2 which are stacked in sequence;

[0077] The interference shielding and electrical signal transmission layer includes a plurality of spacer layers 1, a conductive and shielding film layer and a plurality of spacer layers 2 which are stacked in sequence; the plurality of spacer layers 1 are arranged adjacent to the capacitive touch screen protection layer 2; an air layer is formed between the spacer layer 1 and a plurality of spacer points attached to the spacer layer 2, wherein the spacer points can be supports of any shape, and the spacer layer 1 is used to isolate the capacitive touch screen protection layer 2 from the conductive and shielding film layer in a pressure-free state; the conductive and shielding film layer is used to shield the interference of the power conductive film layer in the pressure-free signal area, and transmit the electrical signal of the power conductive film layer in the pressure signal area;

[0078] The pressure signal power supply layer includes a power conductive film layer and a substrate film layer (PET plastic film) stacked in sequence; the power conductive film layer is adjacent to a plurality of spacer layers 2, and the spacer layers 2 are used to isolate the conductive and shielding film layer from the power conductive film layer under no pressure; the power conductive film layer is a conductive film that is conductive to the power electrode.

[0079] In this embodiment, the three functional layers of the capacitive signal receiving layer A, the interference shielding and electrical signal transmission layer B, and the pressure signal power supply layer C are separated by the air layer formed by the spacers therein. The interference shielding and electrical signal transmission layer B plays a role in shielding the electromagnetic interference and capacitive interference of the charge in the pressure signal power supply layer C on the flexible multi-point capacitive touch screen layer in the capacitive signal receiving layer A when the screen is not subjected to pressure touch control, the layers are not deformed and contact each other, and the positions other than the contact positions of the layers caused by pressure touch control. When the main layer of the pressure touch film is subjected to pressure from multiple positions transmitted from the insulating covering layer, the layers of the main layer of the pressure touch film are in contact and fit with each other at the corresponding pressure positions due to the pressure, and the electrical signals in the pressure signal power supply C are transmitted to the flexible multi-point capacitive touch screen layer of the capacitive signal receiving layer A through the interference shielding and electrical signal transmission layer B at the contact and fit positions to form capacitive touch signals.

[0080] In this embodiment, the flexible film layer and the substrate film layer may be plastic films with a high dielectric constant.

[0081] In one embodiment, the flexible multi-point capacitive touch screen in the capacitive receiving layer A may be a projected mutual capacitive touch screen, and may use bendable nanosilver as a transparent sensing material. The pattern may be formed by multiple rows and columns of diamond strings embedded in each other.

[0082] like Figure 3As shown, X represents a diamond series and Y represents a diamond series column. The capacitance formed between the nanosilver diamond series that intersect a row and a column is a mutual capacitance. The working principle is: the capacitive screen driver chip applies an excitation signal to the diamond series row by row, and then detects the received signal column by column when the excitation signal is applied to a row to measure the value of each intersection. When there is no finger touch, the mutual capacitance at each row and column intersection is certain, so the detected received signal value (generally the current value) is certain. When there is a finger touch, the mutual capacitance of the finger touch area decreases, and the mutual capacitance of several intersections decreases. The chip software controls the intersection scanning circuit to scan each intersection of the screen, and the corresponding diamond series and diamond series received signal values ​​detected are reduced by more than the set threshold, so the area touched by the finger is measured, and according to the size of the intersection signal, combined with the change of the adjacent intersection signal, the finger is accurately positioned. In this way, the main layer of the pressure touch film converts the pressure into an electrical signal, and then converts it into a capacitive touch signal. The capacitive touch signal is transmitted to the capacitive control chip and input into the computer for processing.

[0083] It should be noted that this flexible capacitive touch screen is a universal flexible capacitive touch screen, and a flexible capacitive touch panel can be used in the main layer of the opaque pressure touch film.

[0084] In one embodiment, the adjacent order of the pressure signal power supply layer, the interference shielding and electrical signal transmission layer, and the capacitive signal receiving layer of the pressure touch film main layer is kept unchanged, and the pressure touch film main layer is set forward on the bottom layer of the insulating cover layer, or the pressure touch film main layer is set upside down on the bottom layer of the insulating cover layer. The pressure touch film main layer can be turned over as a whole according to the needs of setting and use, and is used to realize a simple multi-point pressure touch function and a multi-point capacitive touch and multi-point pressure touch function, and has the function of eliminating external interference to the touch screen. The transparent pressure touch film main layer in this embodiment can also be set behind the flexible display screen.

[0085] In one embodiment, the main layer of the pressure touch film is arranged on the surface of the display screen, that is, between the line of sight and the screen, and the various layers of the main layer of the pressure touch film and the insulating covering layer are all made of transparent materials, and the conductive and shielding film layer is a transparent conductive film that is conductive as a whole and is connected to the ground wire. The main layer of the pressure touch film is arranged in a transparent form on the outer layer of the display screen (between the line of sight and the screen), and has the function of directly receiving the capacitive signal formed by the finger touch and the like conducted from the insulating covering layer with the internal capacitive screen. The main layer of the pressure touch film in this embodiment is equivalent to a touch screen, and can also directly receive the capacitive signal of the finger touch on the screen surface, input it into the flexible multi-point capacitive touch screen layer, and transmit it to the computer. It is also suitable for folding screens that do not require high screen thickness.

[0086] In this embodiment, the overall conductive transparent conductive film as a conductive and shielding film layer can adopt the following two structures: a conductive film layer that is connected to the ground at multiple points, or a conductive film layer that is wrapped by a transparent ring-shaped conductive film layer and is connected to the ground at multiple points. In this embodiment, the power conductive film layer provided in the pressure signal power layer is connected to the power electrode.

[0087] like Figure 4 As shown, the main layer of the pressure touch film made in a fully transparent manner can be set together with the insulating cover layer of the first layer of the screen and applied to the top of all display screens, that is, from the line of sight to the display screen. Among them, the transparent insulating cover layer is the first layer, the transparent main layer of the pressure touch film is the second layer, and the display screen is the third layer, that is, this touch input device is equivalent to a transparent touch screen. Transparent optical glue or transparent optical double-sided adhesive is used to stick the layers to be stuck.

[0088] like Figure 5 As shown, the spacer layer 1 can be provided with two layers. In the figure, stacked from top to bottom are: a transparent insulating cover layer 1, a transparent capacitive screen plastic protective layer 2 in the capacitive signal receiving layer A of the main layer of the pressure touch film, a transparent flexible multi-point capacitive touch screen 3, a transparent capacitive screen plastic protective layer 4, transparent spacers of the interference shielding and electrical signal transmission layer B and the spacer air layer 5 formed therein, an ultra-thin transparent plastic layer 6 for attaching transparent spacers, transparent spacers and the spacer air layer 7 formed therein (multiple ultra-thin transparent plastic films with transparent spacers can be provided to form multiple air layers), and a transparent plastic film layer 8 for attaching a transparent conductive film layer , a transparent conductive film layer 9 connected to the ground wire is attached to the transparent plastic film layer 8, the transparent plastic film layer 8 and the transparent conductive film layer 9 constitute a transparent conductive and shielding film layer, a partition point used to form an air layer to separate the pressure signal power supply layer C and the interference shielding and electrical signal transmission layer B and the formed air partition point layer 10, and an electrode plate transparent conductive film 11 connected to the power supply electrode in the pressure signal power supply layer C, a substrate transparent plastic film (PET) 12 for attaching the transparent conductive film 11, a display screen protection layer (plastic film) 13, and a display screen 14.

[0089] In this embodiment, the transparent interference shielding and electrical signal transmission layer B may contain a whole flexible transparent conductive plastic film, such as a nano silver transparent conductive film, as a conductive and shielding film layer in the layered structure. Figure 6As shown. One side of the flexible transparent plastic film layer 8 of the spacer layer 1 is attached with spacers, and the other side is attached with a transparent conductive film layer 9 (such as a nano-silver conductive film layer). The edge coated with the transparent conductive film layer 9 (such as a nano-silver conductive film layer) is connected to the ground wire of the power supply through multiple wires, such as the shielding layer wire of the USB wire. The side coated with the transparent conductive film layer 9 (such as a nano-silver conductive film layer) corresponds to the side of the flexible transparent plastic film layer 12 in the pressure signal power supply layer C coated with a transparent conductive film 11 (such as a nano-silver conductive film layer) electrically connected to the power supply through the spacer layer 2. The base film layer for attaching the nano-silver conductive film layer electrically connected to the power supply and the spacer in the pressure signal power supply layer C is made of a transparent plastic film.

[0090] The pressure signal power supply layer C uses an integrally conductive, bend-resistant thin layer, which may be a plastic film with a transparent conductive layer, such as a nano-silver transparent conductive film. The power conductive film layer is connected to a power electrode or a circuit in a control circuit board that generates sufficient charge.

[0091] When the transparent touch screen device is used, the state profiles of each layer are as follows: Figure 7 ,( Figure 7 The layers shown in Figure 5 The layers shown in Figure 5 The state of each layer under pressure). When there is no pressure from the pen tip or the like, and the entire screen is not deformed, the conductive film 11 connected to the electrode in the pressure signal power supply layer C is full of charge, and sends an interference signal to the flexible multi-point capacitive touch screen 3 in the capacitive signal receiving layer A. The transparent conductive film 9 in the interference shielding and electrical signal transmission layer B is conductive as a whole sheet, which can shield the interference of electromagnetic radiation from the pressure signal power supply layer C to the flexible multi-point capacitive touch screen in the capacitive signal receiving layer A, and forms a conductive and shielding film layer with the transparent plastic film layer 8. In addition, since the transparent conductive film layer 9 in B is connected to the ground wire through a wire, most of the parasitic capacitance of the flexible conductive film 11 in the pressure signal power supply layer C in the transparent conductive film layer 9 in the interference shielding and electrical signal transmission layer B on the flexible multi-point capacitive screen in the capacitive signal receiving layer A is eliminated. The transparent spacer layer 1 (5, 7) further increases the air gap between the flexible capacitive touch screen and the B shielding transparent conductive film layer 9, and further attenuates the interference of the capacitive interference signal on the capacitive touch screen in the capacitive signal receiving layer A, so that the flexible multi-point capacitive touch screen in the capacitive signal receiving layer A can work normally.

[0092] When a finger or the like touches the screen surface, the transparent insulating covering layer transmits the finger capacitance touch signal to the flexible multi-point capacitive touch screen which can work normally and displays the touch track on the screen.

[0093] When the screen is acted upon by a pressure signal from the pen tip, the transparent insulating cover layer converts the surface point pressure into a small area surface pressure near the pen tip and transmits it to the lower layers layer by layer. Finally, the transparent insulating cover layer of the touch device and each layer of the transparent pressure touch film main layer are in contact with the air layer formed by the separation point in the small area pressure area and are almost all attached together. Figure 7 As shown, the electric signal from the transparent conductive film layer 11 of the pressure signal power supply layer C is vertically transmitted to the vertically corresponding small area of ​​the transparent conductive film layer 9 of the flexible transparent conductive film of the B layer through the small area contact area. Here, the electric signal is transmitted to the surroundings through the conductive film layer with square resistance of the conductive film layer 9 on the one hand, and finally flows into the ground wire; on the other hand, since it is grounded here through the square resistance of the conductive film 9, an electric potential is formed here and a capacitance signal is formed. The capacitance signal passes through the transparent plastic film layer 8 with a high dielectric constant, passes through the air layer 7, 5 formed by the spacer points, and is closely attached to each other. Ultra-thin high dielectric constant transparent plastic layers 6, 4 are transmitted to the flexible multi-point capacitive touch screen 3 to form a capacitive touch signal. In other places where there is no contact, the transparent conductive film layer 11 and the transparent conductive film layer 9 are not connected under the insulating effect of the air layer formed by the 10th layer of spacers. The charge of the transparent conductive film layer 9 at the position where the transparent conductive film layer 11 and the transparent conductive film layer 9 are not in contact is not fully supplemented by the charge of the transparent conductive film layer 11, and the charge of the transparent conductive film layer 9 is continuously lost from the ground line, eliminating the parasitic capacitance formed by the transparent conductive film layer 11 in the transparent conductive film layer 9. The uncontacted part cannot form a sufficiently large capacitance signal, and due to the air layer of the spacer layer 5 and 7 and the very low dielectric constant of the air, the capacitance interference signal of the transparent conductive film layer 9 is blocked from being transmitted to the multi-point capacitive touch screen, which plays the effect that the interference signal from the transparent conductive film layer 11 in the pressure signal power supply layer C is shielded by the interference and the electrical signal transmission layer B, and the capacitance interference signal of the transparent conductive film layer 9 in B is isolated by the air layer of the uncontacted part of the spacer layer 5 and 7. The capacitance signal of the uncontacted part cannot effectively conduct interference to the flexible capacitive touch screen in A. The flexible capacitive touch screen of the capacitive signal receiving layer A can maintain normal operation and receive the capacitive signal from the contact part, that is, the electrical signal generated by the pressure position of the pen tip. The small area pressed by the pen tip is generally an approximately circular area. The capacitive control chip uses the centroid algorithm and other software to calculate the approximately circular area of ​​the contact sensing to determine the coordinate position of the pen tip, thereby forming the trajectory of the pressure point of the pen tip. The state of the structural section after pressure is as follows Figure 7 As shown. Since each layer is pasted with transparent optical double-sided adhesive, which is highly transparent and has a certain elasticity, the entire screen layer has elasticity, so the upper and lower layers of each spacer layer can cross the spacer to produce a more complete contact when pressure is applied, and the electrical signal is transmitted well, and the surface returns to flatness after the pressure disappears.

[0094] In this embodiment, a transparent conductive and shielding film layer connected to the ground wire in the interference shielding and electrical signal transmission layer B is wrapped with a transparent insulating layer, and a transparent conductive layer composed of adjacent and mutually insulated transparent conductive ring bands is wrapped outside the insulating layer to form a conductive and shielding film layer having a ring-shaped transparent conductive layer, such as Figure 8 H1 and H2 are shown, in which H1 is a conductive layer composed of a transparent conductive strip adjacent to the conductive film in the pressure signal power supply layer C, H2 is a conductive layer composed of a transparent conductive strip adjacent to the capacitive signal receiving layer, H2H represents a transparent conductive strip film, H3H represents an insulating line between transparent conductive strip films, H1H represents an electrical connection wire in the H1 conductive layer and a corresponding transparent conductive strip film in the H2 conductive layer in the non-display area at the edge of the screen, and 9D represents a transparent conductive layer connected to the ground wire in B in the interference shielding and signal layer and a transparent plastic film used to attach the layer.

[0095] The cross-sectional view of the transparent touch device having a transparent conductive and shielding film layer with a transparent annular conductive layer in the interference shielding and electrical signal transmission layer B is as follows: Fig. 9 As shown, A represents the capacitive signal receiving layer, B represents the interference shielding and electrical signal transmission layer, and C represents the pressure signal power supply layer. From top to bottom, they are: a transparent insulating covering layer 1B, a transparent capacitive screen plastic protective layer 2B in the capacitive signal receiving layer A of the main layer of the pressure touch film, a transparent flexible multi-point capacitive touch screen 3B, a transparent capacitive screen plastic protective layer 4B, transparent spacers of the interference shielding and electrical signal transmission layer B and the spacer air layer 5B formed therein, an ultra-thin transparent plastic layer 6B for attaching transparent spacers, transparent spacers and the spacer air layer 7B formed therein (there may be multiple ultra-thin transparent plastic films with transparent spacers attached thereto to form multiple air layers), H2B represents the transparent conductive strip layer on the side adjacent to the capacitive signal receiving layer, HA represents the plastic insulating film attached to the H2B layer, 8B is a transparent plastic film layer for attaching the transparent conductive film layer, and a transparent conductive film layer 9B attached to the plastic layer 8B and connected to the ground wire , HH represents the wire connecting a transparent conductive strip on the side adjacent to the capacitor signal receiving layer at the edge of the screen and a transparent conductive strip H1B on the side of the conductive film of the pressure signal power layer, HB represents the plastic film layer used to attach the transparent conductive strip on the side adjacent to the pressure signal power layer, H1B represents the transparent conductive strip layer on the side adjacent to the conductive film of the pressure signal power layer, 10B represents the spacer used to separate the strip conductive layer and the conductive layer of the pressure signal power layer and the formed air spacer layer, 11B is the transparent conductive film of the electrode plate connected to the power electrode in the pressure signal power layer C, the base material transparent plastic film (PET) 12B used to attach the transparent conductive film 11B, the display screen protective plastic film 13B, the display screen 14B, and the transparent plastic films are all made of materials with high dielectric constants. Transparent optical glue or transparent optical double-sided adhesive is used to glue the layers to be glued.

[0096] When there is no pressure touch, the interference signal of the conductive film electrode layer 11B in the pressure signal power supply layer C is partially shielded by the conductive film layer 9B connected to the ground in B, and because the conductive film 9B is connected to the ground, most of the interference is eliminated. The parasitic capacitance in the conductive film 9B connected to the ground in the electrical signal transmission layer B is eliminated, and the annular transparent conductive layer H1 shields part of the interference signal, and is attenuated by the air layer at the separation point, so that most of the interference is shielded, and the flexible capacitive screen of the capacitive signal receiving layer A can work normally. When each layer of the touch screen is subjected to pressure touch, the two layers of transparent conductive strips H1B and H2B outside the conductive film 9B connected to the ground in the interference shielding and electrical signal transmission layer respectively make small-area contact with the transparent conductive film electrode layer 11B in the pressure signal power supply C and the plastic layer 6B attached with transparent spacers on one side of the capacitive signal receiving layer A. The charge in the transparent conductive film electrode layer 11B in the pressure signal power supply C is transmitted to the contact area of ​​the transparent conductive strip H1B, and is transmitted to the transparent conductive strip H2B on the other side of the transparent conductive film 9B connected to the ground, to the contact area of ​​the plastic layer 6B attached with transparent spacers. Since the contact area is in close contact with the corresponding layers of the capacitive signal receiving layer A, the transparent plastic layers are very thin and have a high dielectric constant, the capacitive signal of the contact area 6B is transmitted to the corresponding contact area of ​​the protective layer 4B in A and to the flexible capacitive touch screen to form an input signal. The interference signal emitted by the uncontacted pressure signal power supply layer C is mostly shielded by the conductive film layer 9B in B that is connected to the ground wire, and the parasitic capacitance thereon is eliminated. The transparent conductive strips H1B and H2B also shield part of the interference signal. In addition, the air layer formed by the spacing points between B and A further attenuates the interference signal. The charge on one side of the transparent conductive strips H1B in contact with the conductive film electrode layer in C is transferred to the non-contact area of ​​H2B on the side of the capacitive signal receiving layer A. Since this area does not contact the signal receiving layer A, the dielectric constant of the air layer formed by the spacing point layer is very low, which blocks the transmission of the capacitive signal from the area where H2B is not in contact with the capacitive signal receiving layer A to the A layer. At this time, the relative proportion of the area of ​​the charged conductive strip H2B in contact with A to the total area of ​​all conductive strips on the screen (screen area) is very low, which is not enough to form effective interference to the flexible capacitive touch screen in A, so that the flexible capacitive touch screen in the signal receiving layer A can work normally to receive and process the capacitive touch signal from the interference shielding and electrical signal transmission layer B.

[0097] like Fig.10 As shown, the interference shielding layer in the main layer of the pressure touch film and the spacer layer in the electrical signal transmission layer is a thin air layer supported by spacers or other supports, which plays the role of insulation, isolation of signals and attenuation of interference signals. The spacers are generally made of transparent ultraviolet light curing glue (UV glue), attached to the flexible film layer, and distributed at a certain distance.

[0098] In one embodiment, the main layer of the pressure touch film is arranged on the bottom surface of the display screen; the insulating covering layer is arranged on the surface of the display screen and is made of a transparent material to disperse the pressure exerted on the screen by the pen tip and other points into a small area surface pressure and protect the underlying screen structure; the display screen is a flexible display screen; the surface and bottom surface of the main layer of the pressure touch film are both provided with an anti-interference shielding layer for shielding the capacitive interference and electromagnetic interference between the main layer of the pressure touch film and the display screen and the capacitive signal processing circuit.

[0099] In this embodiment, the flexible display screen can be an ultra-thin flexible display screen. Since it is flexible, the pressure on the surface can be transmitted to the back of the screen. The main layer of the pressure touch film made in a transparent manner can also be arranged under the ultra-thin flexible display screen, that is, behind the ultra-thin flexible display screen, as needed, to receive the pressure touch signal received on the screen surface when the tablet computer or mobile phone does not require the screen thickness to be too thin. Therefore, the main layer of the transparent or opaque pressure touch film can be arranged behind the ultra-thin flexible display screen, that is, from the back of the ultra-thin flexible display screen, to receive the pressure touch signal from the screen.

[0100] In this embodiment, if only the pressure touch function is needed, a transparent pressure touch film main layer is only provided under the ultra-thin flexible display screen with a protective layer to realize the pressure touch function.

[0101] In this embodiment, the main layer of the pressure touch film can be inverted or forwardly arranged under the anti-interference shielding layer without changing the adjacent order of each layer, and each layer is filled with smaller independent conductive shielding units in the anti-interference shielding layer, and the independent conductive shielding units of each layer are staggered when viewed from the vertical direction of the circuit board, which can completely block the electromagnetic interference waves passing through the insulation gaps of the independent conductive units of each layer. The pen tip pressure touch signal received by the screen is transformed from the insulating covering layer downward into a small area pressure signal and transmitted to the independently set flexible capacitive touch screen, then to the flexible ultra-thin display screen, then to the anti-interference shielding layer, then to the transparent pressure touch film main layer, and then to the computer. The working principle of this transparent pressure touch film main layer is similar to the working principle of the transparent pressure touch film main layer outside the display screen.

[0102] In one embodiment, Fig.11 As shown, if both capacitive touch and pressure touch functions are required, another flexible touch capacitive screen with a protective layer should be placed under the cover layer and in front of the flexible display, and the chip module of this flexible capacitive touch screen should be connected to import the touch signal to the computer to realize the finger capacitive touch function. A transparent pressure touch film main layer is set behind the flexible display to realize the pressure touch function. The pressure touch and touch touch functions are realized together.

[0103] In one embodiment, the anti-interference shielding layer includes a fully covered conductive film layer or a multi-layer circuit board; the surface of each layer of the circuit board is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, and the independent conductive shielding units between each layer of the circuit board are staggered with each other, and the insulating gaps between the independent conductive shielding units of each layer of the circuit board in the vertical direction of the stacking are all covered by shielding.

[0104] like Fig.12 As shown, the surface of each layer of the anti-interference shielding layer is covered with small independent conductive shielding units. The units are very close to each other and insulated from each other. The units of each layer are staggered with each other, and the gaps formed by the insulating lines between the units of each layer that can penetrate electromagnetic waves are all blocked in the vertical direction, so that the flexible ultra-thin display screen and the flexible capacitive touch screen do not interfere with each other. Since each independent conductive shielding unit has a small area, the parasitic capacitance generated is small, which will not cause great interference to the capacitive touch screen, allowing the flexible capacitive screen to work normally. In the figure, 22, 24, 26, and 28 are independent conductive shielding copper-clad units of each layer of circuit boards, 23 represents the insulating gaps between each unit, and 25 and 27 represent two layers of insulating substrate layers of a three-layer flexible circuit board. This anti-interference shielding layer can also be a shielding layer for shielding interference signals in other ways.

[0105] The anti-interference shielding layer can be a conductive film or a multi-layer circuit board, generally a flexible multi-layer circuit board, which can use PI flexible substrate. This multi-layer circuit board generally has three to four layers. When applied to folding screens and scroll screens, two two-layer or single-layer flexible ultra-thin circuit boards are stacked together to block the interference electromagnetic waves that pass through the insulation gap of each layer of units, while ensuring that the independent conductive units of each layer are staggered to block the electromagnetic waves that pass through the insulation gap of each layer of units in the vertical direction. The interference electromagnetic waves pass through the insulation gap of the conductive shielding unit. It not only ensures that the electromagnetic waves are shielded, but also increases the bending service life of the flexible circuit board. If the interference of other electronic components under the main layer of the pressure touch film is too strong, the same flexible or soft multi-layer circuit board can be set as an interference shielding layer under the main layer of the pressure touch film to prevent the electronic interference signal below from interfering with the capacitive touch screen in the capacitive signal receiving layer A.

[0106] In one embodiment, the main layer of the pressure touch film is arranged behind the display screen, and the display screen is a flexible display screen. The interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer adopts a multi-layer rigid circuit board or a multi-layer flexible circuit board that meets the vertical deformation requirements; wherein,

[0107] Each layer of rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly covered with independent conductive shielding units (copper foil blocks) spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of rigid circuit board are staggered, and the insulating gaps between the independent conductive shielding units of each layer of rigid circuit board in the vertical direction of the stacking are all shielded and covered to shield the electromagnetic interference passing through the insulating gaps of the independent conductive shielding units in each layer of rigid circuit board; the independent conductive shielding units corresponding to the top rigid circuit board and the bottom rigid circuit board are electrically connected through vias to transmit the electrical signal of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked with metal to shield the capacitive interference and electromagnetic interference passing through the vias;

[0108] Each layer of flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of flexible circuit boards are staggered, and the insulation gaps between the independent conductive shielding units of each layer of flexible circuit boards in the vertical direction of the stacking are all shielded and covered, which is used to shield the electromagnetic interference passing through the insulation gaps of the independent conductive shielding units in each layer of flexible circuit boards; the independent conductive shielding units corresponding to the top flexible circuit board and the bottom flexible circuit board are electrically connected through vias, which are used to transmit the electrical signals of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked with metal to shield the capacitive interference and electromagnetic interference passing through the vias; the vias from the independent conductive shielding units of the P layer to the independent conductive shielding units of the Q layer in the multi-layer circuit board are used to transmit the current of the independent conductive shielding units of the P layer that are under pressure contact to the independent conductive shielding units of the Q layer. The P layer and the Q layer can be the top circuit board or the bottom circuit board respectively.

[0109] The independent conductive shielding unit is a conductive material with a conductivity coefficient greater than a set threshold, including a metal material.

[0110] like Fig.13As shown, the anti-interference shielding layer uses two double-layer ultra-thin flexible circuit boards with the same area and covered with an insulating layer, which are stacked together. The substrate is a PI (polyimide) substrate circuit board, one is a double-layer flexible circuit board, and the other is a single-layer flexible circuit board. Each layer uses 4.5*4.5 mm square independent shielding units that are insulated and closely spaced from each other, and the positions of the two flexible circuit boards are fixed at the edge of the screen. In the figure, I and L represent two stacked two-layer flexible circuit boards, where 76 represents the insulating layer of the two flexible shielding circuit boards, and 76A represents the substrate layer of the two circuit boards. 77 represents the independent shielding units of each layer, 78 represents the insulation gap of each layer of the shielding units, and 79 represents the very small gap between the two circuit boards. The independent shielding units of each layer of the three-layer circuit board are staggered with each other. When viewed from the vertical direction, the shielding units of the four-layer circuit board completely block the shielding gaps formed by the insulating wires of each layer, and form a complete copper shielding layer when viewed from the vertical direction. It blocks the interference of other electronic components below. Since the thickness of the insulation medium between the three-layer circuit boards is very small, only 25 microns thick, the vertical electromagnetic interference signal shielding effect is very good, which can effectively block the interference signal from the electronic devices below. Other functional layer films and hard circuit boards are also fixed in the non-display function area at the edge of the screen.

[0111] The main layer of the pressure touch film is arranged behind the display screen, which is a flexible display screen. A conductive and shielding film layer is provided in the interference shielding and electrical signal transmission layer, and the conductive and shielding film layer adopts a multi-layer rigid circuit board that meets the vertical deformation requirements; each layer of the rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly covered with independent conductive shielding units (copper foil blocks) with intervals less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of the rigid circuit board are staggered and distributed with each other, and the insulation gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the stacking are shielded and covered to shield the electromagnetic interference passing through the insulation gaps of the independent conductive shielding units in each layer of the rigid circuit board; the independent conductive shielding units corresponding to the top rigid circuit board and the bottom rigid circuit board are electrically connected through vias, which are used to transmit the electrical signals of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked with metal to shield the capacitive interference and electromagnetic interference passing through the vias.

[0112] If the anti-interference shielding layer adopts a hard board structure, and the multi-layer hard board adopts a hard substrate, a very thin "bismaleimide triazine resin" resin, referred to as BT resin material, can be used as the base material to make an ultra-thin hard board. The conductive material of the circuit board generally adopts metal materials such as copper, or the circuit board circuit adopts conductive materials such as nano silver ink. The thin conductive layer is made by printing, vacuum spraying, printing and other methods to make the thickness less than 0.3 mm. Therefore, this multi-layer hard board is also relatively flexible to adapt to local deformation under pressure, pass through the spacer layer to contact and fit with other layers, and return to flatness after the pressure is eliminated, so that when the surface circuit layer contacts other layers, the electrical signals of other layers are transmitted through the multi-layer circuit board.

[0113] like Fig.14 As shown, if the conductive and shielding film layer is a three-layer flexible circuit board composed of independent conductive shielding units, the positions of the conductive shielding units connected to the topmost conductive shielding unit and the corresponding position at the bottom in the vertical direction will be staggered, and the position of the electrical signal transmission from the first layer to the last layer will also be staggered. The position of the sensing area formed on the flexible capacitive touch screen will be staggered with the position of the small contact area formed under the touch pressure point, and the area depressed by the pressure point of the first layer of the screen is basically circular. In the figure, 47A represents the position where the first layer of the multi-layer circuit board contacts the pressure signal power supply layer, and 47B represents the contact sensing position area of ​​the flexible capacitive touch screen in the third layer of the multi-layer circuit board and the capacitive signal receiving layer. There will be a fixed difference between the two positions. 49 represents a via blocked by metal, and 48 represents an independent conductive shielding unit copper foil block on the multi-layer circuit board. The position of the capacitive sensing area formed by the third layer of the multi-layer circuit board to the flexible capacitive touch screen will have a basic fixed difference with the position of the contact area between the first layer of the multi-layer circuit board and the C layer. This can be corrected by software to the position area formed by the received signal to calculate the area of ​​the corresponding first layer of the screen and the pressure point position coordinates.

[0114] The conductive and shielding film layer is a four-layer flexible circuit board. Since there are four conductive layers in total, the conductive shielding units of each conductive layer of the first, second and third layers are arranged in a staggered manner to block the vertical electromagnetic radiation at the gaps and vias of the conductive shielding units of each layer. The three conductive shielding units in the vertical direction are staggered and vertically conductive. The position of the conductive shielding unit of the fourth layer can completely overlap with the vertically corresponding conductive shielding unit of the top layer, that is, the plane coordinates of the top conductive shielding unit are completely consistent with the plane coordinates of the bottom conductive shielding unit, such as Fig.15As shown, 72C represents the position where the first layer of the circuit board contacts the pressure signal power supply layer, and 73C represents the contact sensing position area between the fourth layer of the multi-layer circuit board and the flexible capacitive touch screen in the capacitive signal receiving layer. The two positions are completely consistent. Therefore, when the layers are in contact due to pressure, the position of the charge transmission area of ​​the pressure signal power supply layer C is completely consistent with the position of the signal receiving coordinate area of ​​the signal receiving layer A. There is no need to correct the coordinate position. The depressed area pressed down by the pressure point is basically circular, and the area is basically fixed. The pressure point position can be calculated by algorithm software.

[0115] When there is no pressure touch, the multi-layer flexible circuit board of the interference shielding and electrical signal transmission layer B is separated from other layers by the spacer layer and does not contact, thereby shielding the interference of the pressure signal source layer C to the capacitive touch screen of the electrical signal contact layer A, and the flexible capacitive touch screen can work normally.

[0116] When there is pressure touch, the schematic diagram is as follows Fig.16 The layers in the approximately circular small area around the pressure point such as the pen tip will contact each other through the isolation layer, and the charge in the contact area of ​​the conductive film electrode layer 11 in the pressure signal power supply layer C will be transmitted to the multiple independent conductive shielding units on the contact surface of the multi-layer flexible circuit board in contact with the interference shielding and electrical signal transmission layer B through the through holes of the independent conductive shielding units at the corresponding positions in the vertical direction of each layer, and then transmitted to the multiple independent conductive shielding units on the surface of the flexible circuit board in contact with the capacitive signal receiving layer A. These conductive shielding units transmit the capacitive signal to the flexible capacitive touch screen protective layer in the capacitive signal receiving layer A, and then to the flexible capacitive screen.

[0117] In one embodiment, the display screen is a foldable display screen; the interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer adopts a soft-hard combined circuit board that meets the vertical deformation requirements;

[0118] The hard-soft combined circuit board includes a multi-layer rigid circuit board connected by a multi-layer flexible circuit board; each layer of the rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, and the independent conductive shielding units between the multi-layer rigid circuit boards are staggered, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the stacking are all covered by shielding, and the independent conductive shielding units corresponding to the top rigid circuit board and the bottom rigid circuit board are electrically connected through vias; the multi-layer flexible circuit board is located in the folding area, and a groove is set on one side edge of the middle layer of the rigid circuit board, and the edge of the flexible circuit board is inserted into the groove to fix the flexible circuit board; the independent conductive shielding units in the remaining layers of the rigid circuit board are staggered in the vertical direction of the groove, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the groove are all covered by shielding; the multi-layer flexible circuit board is generally a two-layer circuit board, and the multi-layer flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other;

[0119] The independent conductive shielding unit is a conductive material with a conductivity coefficient greater than a set threshold, including a metal material.

[0120] In this embodiment, Fig.17 As shown, the top layer of the computer touch input device is a transparent insulating covering layer, and a flexible multi-point touch capacitive screen with a protective layer can be set below it to realize the multi-point capacitive touch function (this layer that does not need the screen to have a capacitive touch function can be omitted), and below it is an ultra-thin flexible display screen 14 with a protective layer, and an anti-interference shielding layer 17. The anti-interference shielding layer 17 can be a thin metal layer or a thin metal plate, or a multi-layer circuit board. Below the multi-layer circuit board is each layer full of smaller independent and mutually insulated conductive shielding units. The independent conductive shielding units corresponding to the vertical direction in each layer of the circuit board are staggered and distributed with each other. The multi-layer flexible or soft circuit board as the anti-interference shielding layer can use a PI substrate. Below it is an opaque pressure touch film main layer. The pressure touch film main layer mainly includes a capacitive signal receiving layer A, an interference shielding and electrical signal transmission layer B, and a pressure signal power supply layer C. Each layer contains a layer. The layers below the flexible ultra-thin display are, from top to bottom, a flexible display protection layer 13, an anti-interference shielding layer 17, a pressure signal power supply layer C, an interference shielding and electric signal transmission layer B, a capacitive signal receiving layer A, an anti-interference shielding layer 18, and a computer component layer 19. This can achieve the purpose of supporting both multi-point pressure touch and multi-point capacitive touch control.

[0121] In this embodiment, Fig.17As shown, outside the ultra-thin flexible display screen, a transparent cover layer should be set first (between the line of sight and the display screen), and a device with both capacitive touch and pressure touch functions should be provided. Another separate flexible touch capacitive screen 16 with a protective layer should be set under the insulating cover layer and above the flexible display screen, and this flexible capacitive touch screen should be connected to the chip module, and connected to the computer to realize the finger capacitive touch function. Under the flexible display screen, that is, the back is set with an opaque pressure touch film main layer to realize the pressure touch function. If only the pressure touch function is needed, it is only necessary to set the opaque pressure touch film main layer under the ultra-thin flexible display screen with a protective layer to realize the pressure touch function, and there is no need to set a separate flexible capacitive touch screen layer 16 on the ultra-thin flexible display screen.

[0122] In this embodiment, Fig.17 As shown, the flexible multi-point capacitive touch screen with a protective layer separately provided under the transparent insulating cover layer generally adopts a nano-silver flexible multi-point capacitive touch screen to simply receive capacitive touch signals such as fingers. A flexible multi-point capacitive touch screen protective layer 13 is provided on the surface and bottom of the flexible multi-point capacitive touch screen 16. Here, the flexible multi-point capacitive touch screen 16 is a transparent flexible multi-point capacitive touch screen separately provided on the ultra-thin display screen (between the line of sight and the display screen).

[0123] In this embodiment, Fig.17 As shown in FIG. 1 , the protective layer 31 of the flexible display screen 14 is a thin plastic layer, which is used to protect the ultra-thin flexible display screen when it is subjected to a squeezing force from the lower layer. The anti-interference shielding layer 17 of the flexible display screen is a metal film or a film coated with a metal layer, or can be Fig.12 The multilayer circuit board of the structure shown, or the multilayer circuit board of other structures. The protective layer of the flexible screen display screen and the shielding layer are bonded by adhesive.

[0124] In this embodiment, Fig.17 As shown, the pressure signal power supply layer C is respectively composed of a substrate film layer 12 (plastic insulating layer, such as PET) for attaching the power conductive film layer 11, and an integrally conductive power conductive film layer 11 connected to the power electrode. The pressure signal power supply layer can be a metal sheet, a plastic sheet coated with a metal film, or a plastic sheet coated with a conductive layer of other materials (such as a plastic sheet coated with a nano-silver conductive layer, or a plastic sheet coated with a graphene conductive layer). The conductive layer is at the bottom layer, and the voltage of the conductive layer is generally less than 7V.

[0125] In this embodiment, Fig.17As shown, the conductive and shielding film layer 9 in the interference shielding layer and electrical signal transmission layer can be a multi-layer circuit board, generally an ultra-thin hard circuit board with good mechanical properties such as elasticity and flexibility, and a multi-layer hard circuit board or a multi-layer hard-soft combination circuit board or a flexible multi-layer circuit board connected by a multi-layer flexible circuit board. The flexible multi-layer board is generally made of a plastic substrate such as PET with good flexibility and elasticity, and the circuit board circuit is made of a thin conductive layer or a thin PET copper coating layer made of conductive materials such as nano silver ink by printing, vacuum spraying, printing, etc. The total thickness of the hard board, multi-layer flexible circuit board or multi-layer hard-soft combination circuit board is generally less than 0.3 mm. For the main layer of the touch film arranged on the surface of the display screen, the conductive and shielding film layer connected to the ground wire is generally a transparent nano silver film coated on a transparent plastic film substrate such as PET, and is conductive with the ground wire at the edge.

[0126] In this kind of conductive and shielding film layer using a multi-layer hard circuit board, a four-layer circuit board is generally used. In a folding screen tablet or folding screen mobile phone, two hard boards can generally be used in the screen circuit board, which are connected by a shorter ultra-thin soft board at the fold position, such as its cross-section. Fig.18 As shown, two grooves 50 are made on the edges of two hard boards 49 near the fold position, and the two sides of the soft board 51 are inserted into the grooves. A denser spacing point area 52 is set at the upper and lower spacing point layer positions vertically corresponding to the soft board to isolate the contact between the flexible circuit board and the capacitor signal receiving layer and the pressure signal power supply layer. The length outside the groove of the flexible circuit board is very short, generally less than 2 mm. The two ends of the flexible circuit board are inserted into the grooves of the hard board. When the upper and lower surfaces are subjected to pressure, they are supported and squeezed by the dense spacing point area of ​​the spacing point layer of the capacitor signal receiving layer and the dense spacing point area of ​​the spacing point layer of the pressure signal power supply layer, respectively, so the position can be fixed.

[0127] Furthermore, the flexible soft board generally uses a PI (polyimide) substrate or a PET (polyethylene terephthalate) substrate to adapt to the repeated bending of the multi-layer circuit board at the center seam with the folding screen. An insulating layer is set on the outer surface of the soft board. The flexible circuit board that connects two ultra-thin hard multi-layer circuit boards at the center seam of the folding screen is generally a two-layer circuit board. The cross-section of the two-layer circuit board is as follows Fig.19, the two-layer flexible circuit board is filled with smaller shielding interference units 53 (small copper foil blocks) that are staggered with the other layer. To block the interference electromagnetic waves passing through the insulation separation line 54 where there is no copper foil circuit in the other layer of the flexible circuit board, the insulation lines between the independent shielding unit circuits (small copper foil blocks) in the other side of the flexible circuit board are completely blocked in the vertical direction. The small copper foil blocks completely block the insulation separation lines of the copper foil blocks on the other side, thereby completely blocking the interference electromagnetic waves passing through the insulation lines. 55 is the insulating flexible medium of the double-layer flexible circuit board. Since the flexible circuit board is stuck in the edge groove of the hard board, the small shielding interference units (small copper foil blocks) in the soft board and the smaller independent conductive shielding units in the hard board are also staggered, so the electromagnetic interference signal of the pressure signal power supply layer C passing through the junction of the hard board and the soft board to the capacitive signal receiving layer A is completely shielded. In this way, the soft board area connecting the two hard boards completely shields the electromagnetic interference signal of the pressure signal power supply layer C of the ultra-thin hard board at the connection of the soft board to the capacitive signal receiving layer A.

[0128] For folding screen mobile phones or tablets that use ultra-thin soft boards inserted into the grooves of hard boards to connect the conductive and shielding film layers, or use multi-layer circuits of soft and hard boards, the flexible multi-layer circuits connecting the ultra-thin hard boards at the folding seams are very short, generally less than 2 mm. When the circuit board is flattened with the screen for use, the gap between the ultra-thin hard boards where the flexible soft boards outside the hard boards are located is very narrow, generally less than 2 mm. The flexible soft boards are thinner than the ultra-thin hard boards. For the nearly circular small contact and fitting areas of each layer generated by the pressure points outside the screen pressing down on the conductive and shielding film above and below, the interval points are distributed as follows Fig. 20 , where 47 represents the denser spacing point area corresponding to the flexible circuit connected to the hard circuit board, and 48 represents the spacing point distribution area corresponding to the hard circuit board. The flexible board area is basically not in contact with the adjacent upper and lower layers due to the dense spacing points and the insulation of the outer layer of the soft board, and there is no circuit board on the surface for conducting charges between the upper and lower layers. Therefore, when there is a pressure point nearby to form a circular small area contact and fit area, the nearly circular contact and fit area is within the capacitive signal sensing area of ​​the corresponding area formed by the multi-point flexible capacitive screen, such as Fig.21 As shown, a narrow slit area 74 is formed where no electrical signal is transmitted. However, this narrow slit area is very small relative to the area 75 of the capacitive signal sensing nearly circular area formed by the contact fitting area. In the capacitive touch screen, it does not affect the positioning of the capacitive signal receiving area, and thus does not affect the positioning of the center of gravity pressure point 76B of the area, that is, it does not affect the positioning of the screen pressure point such as the pen tip.

[0129] Furthermore, for the conductive and shielding film layer in the interference shielding and signal transmission layer B, when a four-layer rigid circuit board is used, the first layer of the rigid board, that is, the top surface, is covered with smaller independent conductive shielding units, and each unit is separated and insulated by very fine insulating wires. The area of ​​this smaller conductive shielding unit is generally less than 25 square millimeters. The fourth layer, that is, the bottom surface, is also covered with smaller independent conductive shielding units, and each unit is separated and insulated by very fine insulating wires. The vertical positions of the independent conductive shielding units of the first and fourth layers correspond to each other and are connected through through holes. The partial top view of the first layer of the multi-layer circuit board is shown as follows: Fig. 22 , where the oblique shaded portion 56 represents the copper foil conductive shielding unit, 57 is the insulating line between them, and the area enclosed by the dotted line is the shielding unit of the second layer of circuit board, as shown in the figure 58. The oblique shaded portion represented by 56 is the area of ​​the interfering electromagnetic waves shielded by the copper foil of the first layer of conductive shielding unit. 59 is a through hole blocked by metal that electrically connects the copper foils of the corresponding conductive shielding units of the first and fourth layers. In the second and third layers of circuit boards, independent shielding unit circuits (small copper foil blocks) that are insulated from each other and much wider than the insulating lines are set at the places vertically corresponding to the insulating lines of each independent conductive shielding unit on the surface of the first and fourth layers of hard boards, to jointly block the insulating lines between the independent shielding unit circuits (small copper foil blocks) of the first layer of circuit board in the vertical direction. A partial top view of the second layer of circuit board is shown in the figure. Fig.23 The second layer shielding unit is 61, and the areas surrounded by solid lines are shielding copper foil blocks. In the figure, 60 indicates that the areas surrounded by thick solid lines and oblique shadows are the areas where the first layer shielding unit shields interfering electromagnetic waves. The areas surrounded by dotted lines 62 are the copper foil blocks and shielding areas of the third layer of circuit board shielding units. The black shaded parts in the figure are the areas of electromagnetic waves that are shielded by the second layer and pass through the insulating gaps of the first layer of shielding units. 63 indicates the insulating gaps between the copper foil blocks of the first layer of shielding units, and 64 indicates the insulating gaps between the copper foil blocks of the third layer of shielding units. The second and third layers of shielding units jointly block interfering electromagnetic waves that pass through the insulating gaps of the first layer of shielding units. A partial top view of the third layer of circuit board is shown in Fig.24 As shown, the area surrounded by the thin solid line 65 is the shielding unit copper foil of this layer, 66 indicates that the oblique shaded area surrounded by the thick solid line is the 1st and 4th layers of shielding unit copper foil and the shielded interference electromagnetic wave area, the area surrounded by the dotted line 67 indicates the positions of the interference electromagnetic waves shielded by the shielding unit copper foil of the second layer of circuit board, and the black shaded part is the position area of ​​the interference electromagnetic waves shielded by the third layer of circuit board after the interference electromagnetic waves pass through the shielding areas of the first and second layers of circuit boards.

[0130] The three-dimensional schematic diagram is as follows Fig.25 As shown, C1 represents the first layer of the circuit board, C2 represents the second layer of the circuit board, C3 represents the third layer of the circuit board, C4 represents the fourth layer of the circuit board, and C5 represents the conductive through holes of the first and fourth layers. Fig.26, where 1C represents the first layer of circuit board, 2C represents the second layer of circuit board, 3C represents the third layer of circuit board, 4C represents the fourth layer of circuit board, 5C represents the conductive vias of the first and fourth layers of circuit boards, and 1D represents each insulating layer.

[0131] In this partial picture of the multi-layer circuit board, the interference electromagnetic waves in the vertical direction of the circuit board are completely blocked by the shadow part of the three-layer circuit board, that is, the copper foil of the staggered shielding unit of the four-layer circuit board completely blocks the interference electromagnetic waves passing through the multi-layer circuit board. Thus, the interference electromagnetic waves are completely shielded at the hard board.

[0132] In display screens such as scroll screens and folding screens, the conductive and shielding film layer in the interference shielding and signal transmission layer B in the main layer of the pressure touch film adopts a multi-layer flexible circuit board. The circuit board circuit adopts a thin conductive layer with good conductive properties made by printing or printing methods using conductive materials such as nano silver ink. Insulating ink can be used to print or print the insulating layer to form a printed multi-layer circuit board to achieve the function of shielding interference electrical signals. This multi-layer flexible circuit board generally uses materials such as PET with good elasticity as the substrate. In this way, the thickness can be increased by only 0.6 mm compared to the original screen. The top and bottom layers are filled with independent conductive shielding units (thin silver square covering layers) that are closely spaced and insulated from each other. The top and bottom layers are completely consistent in the vertical direction of the multi-layer circuit board, or slightly staggered and corresponding to each other, and the circuit is turned on by vias and the use of hetero-square conductive double-sided tape in the middle layer to transmit electrical signals from the top layer to the bottom layer. The area of ​​this smaller conductive shielding unit is generally less than 25 square millimeters. The top and bottom layers of the multilayer circuit board are covered with independent conductive shielding units that are closely spaced and insulated from each other. Each layer of the multilayer circuit board is used as a layer of shielding material. The smaller independent conductive shielding units play the role of shielding the electromagnetic radiation interference signal of the pressure signal power supply layer C. The middle layers of the multilayer board are also provided with independent shielding units (small-area metal foil layers) that are insulated from each other. Through staggered distribution, the interfering electromagnetic waves that pass through the insulation gaps of the independent conductive shielding units on the surface of the multilayer circuit board are completely blocked in the vertical direction of the multilayer circuit board. The interfering electromagnetic waves of the pressure signal power supply layer C that pass through the gaps of the independent conductive shielding units are almost completely blocked, so the flexible multilayer circuit board serves the purpose of shielding the electromagnetic interference of the signal power supply layer C.

[0133] The circuit shielding layout method of each layer of the flexible multi-layer circuit board to block the penetration of interfering electromagnetic waves in the vertical direction, such as a four-layer hard board circuit, is to completely shield the interfering electromagnetic waves passing through the multi-layer circuit board in the vertical direction of the circuit board through the staggered distribution of independent conductive shielding units (circuit blocks) in each layer of the circuit board.

[0134] The conductive and shielding film layer in the interference shielding and signal transmission layer made of flexible circuit boards such as PET can be printed or etched on both sides of a thin PET plastic plate, and independent conductive shielding units with close printing intervals and mutual insulation can be printed. It can be a square silver foil covering layer separated by many thin lines. The width of the insulating thin lines is generally 0.1 mm, and the area of ​​the square is generally 4*4 square millimeters. Each independent conductive shielding unit on both sides, that is, the square silver foil covering layer, is staggered on the X-axis and the Y-axis, and the position of the spaced thin lines is blocked as much as possible in the vertical direction of the circuit board to shield the interfering electromagnetic waves passing through the thin lines. In this way, there will be many intersections of the insulating thin lines on the two sides that are not blocked, and a very small insulating layer covering the intersections can be printed above these very small 0.1*0.1 square millimeter intersections, and then a metal conductive shielding layer is printed on the insulating layer to shield the interfering electromagnetic waves passing through the intersections. Each corresponding independent conductive shielding unit on both sides of the PET plastic is a square silver foil layer block, which is connected through very small vias and printed with full silver ink or vacuum metallization, metal deposition and other methods to achieve electrical conduction and electromagnetic shielding of the vias. In this way, the electrical signal transmitted from the top contact is transmitted to the lower layer through the interference shielding and signal transmission layer made of PET and other materials through contact with the lower layer, and electromagnetic interference shielding is achieved, but the transmission position will have a certain misalignment on the X-axis and Y-axis, which can be corrected by software. The transmission signal at the intersection of the insulation lines of the independent conductive shielding unit will be ignored and corrected by the software of the capacitive touch screen recognition signal due to its very small area, and will not affect the input of the touch signal. In addition, because the printed insulation layer and conductive circuit layer are very thin and the area is very small, it does not affect the contact and electrical signal transmission of the corresponding layers. Fig. 27 As shown, 193 is the metal layer circuit of the PET circuit board in the interference shielding and signal transmission layer close to the pressure signal power supply layer, 194 is the metal layer circuit close to the capacitor signal receiving layer, 191 is a tiny and thin metal shielding layer set by printing or other methods to block interference electromagnetic waves passing through the insulating gaps of the independent conductive shielding units on both sides of the PET, 192 is a tiny and extremely thin insulating layer set by printing or other methods for attaching 191 and isolating 191 from other circuits, and 195 is a via hole in which the metal foil of the independent conductive shielding unit on one side of the PET is electrically connected to the metal foil of the corresponding independent conductive shielding unit on the other side and is filled with metal conductive material.

[0135] The conductive and shielding film layer uses a PET substrate multi-layer circuit board. When the second and third layers are bonded, high temperature bonding is not possible. Anisotropic double-sided adhesive can be used for bonding. Therefore, it is impossible to directly connect the 1st and 4th layers of independent conductive shielding units with through-conductive holes. PET can be used as the substrate, and nano silver ink can be used to print double-sided circuits as two-layer circuit boards, or very thin PET double-sided copper layers can be used to make two-layer circuit boards. Through-holes can be used for electrical conduction, and the conductive via connection method of the 1st and 4th layers of conductive shielding units can be connected. Fig.28In the figure, 70 represents the nano silver foil block of each conductive shielding unit, and 71 represents the conductive vias for connecting the corresponding conductive shielding units on the 1st and 4th layers of the circuit board. Two double-sided PET nano silver ink and other conductive materials are selected to print the circuit board, one for the first and second layers of the four-layer board, and the other for the third and fourth layers. The second and third layers of the circuit board are covered with insulating layers 68A and 68B respectively, and only the via nano silver material pads 681 and 682 with a higher printing height are exposed, so that the second layer via pads 681 and the third layer pads 682 are exposed, and then the vertical direction is used for conductivity. The non-conductive anisotropic conductive double-sided tape 69 in the plane direction is pasted on the second and third layers, and the first PET circuit board and the second PET circuit board are overlapped at the positions of the corresponding via pads 681 and 682 on the second and third layers of the four-layer circuit board, so that the pads 681 and 682 are electrically conductive, and then the via 71 is electrically conductive, and then the corresponding conductive shielding units of the first to fourth layers are electrically conductive, while the pads are non-conductive in the parallel direction, and the via 71 is blocked by a metal nano-silver thin layer, or blocked by a 70 nano-silver metal thin layer circuit, blocking the interference electromagnetic waves from passing through the via. 70A and 70B represent the insulating layers between the first and second layers and the third and fourth layers of the circuit board respectively. Or other conductive methods are used to make the independent conductive shielding units corresponding to the first and fourth layers conductive.

[0136] In the case where the multi-point flexible capacitive touch screen has a very strong anti-interference ability, in addition to the densely distributed independent conductive shielding units in the first and last layers in the multi-layer flexible circuit board or the multi-layer soft-hard combination multi-layer circuit board in the conductive and shielding film layer, in the middle layer circuit board, a mesh shielding circuit line network much wider than the width of the insulation line is set at the position of the insulation line of the first and last layers of the independent conductive shielding units in the vertical direction of the circuit board to block and shield the interference electromagnetic waves passing through the gaps of the independent conductive shielding units in the first and last layers of the flexible multi-layer board. Since each layer of the circuit board in the multi-layer board is very close to each other, and the independent conductive shielding units set in each shielding material layer are staggered from each other in the vertical direction without gaps, the electromagnetic interference signal transmitted from the pressure signal power supply layer C through the gaps of the independent conductive shielding units in each layer can be completely blocked in the vertical direction. Therefore, the interference electromagnetic waves in the gaps and vias of the conductive shielding units on the ultra-thin multi-layer soft-hard combination circuit board or in the multi-layer flexible circuit board are almost completely blocked, and the multi-layer circuit board plays a good electromagnetic shielding role. The flexible multi-point capacitive touch screen in layer A can work normally.

[0137] In the fully flexible multi-layer circuit board in the conductive and shielding film layer, the hard board connected by the soft board, or the ultra-thin hard board in the soft-hard combined multi-layer circuit board, the shape and area of ​​each independent conductive shielding unit can also be exactly the same, and each unit in each layer is separated and insulated by an insulating line. The independent conductive shielding units of each layer are distributed in a staggered manner in the vertical direction of the circuit board to completely block the interference electromagnetic waves that pass through the insulating separation lines of each layer of units in the vertical direction of the multi-layer circuit board. The independent conductive shielding unit circuits at the corresponding positions in the vertical direction of the top surface and the bottom surface can be electrically conductive through through holes and other methods, and the through holes can be blocked by methods such as metal deposition copper paste filling holes to transmit the top electrical signal to the bottom layer and shield the electromagnetic interference signal passing through the blind hole, buried hole and other connecting circuit holes. In the interface area where the soft board connects to the hard board, the vias should avoid the groove area of ​​the hard board. Each smaller independent conductive shielding unit corresponding to each layer in the vertical direction of the multi-layer circuit board can also be connected to each other in the vertical direction through vias (blind holes, buried holes). The apertures of blind holes and buried holes are very small, and the diameter can be less than 0.2 mm, so that the independent conductive shielding units at the corresponding positions of the first layer and the last layer are electrically conductive to each other. Fig.15 As shown, the shaded block part represents the metal foil block of the independent conductive shielding unit of each layer of the circuit board, 72A represents the insulating wire of the independent conductive shielding unit of the partition layer, and the circuit connecting the corresponding independent conductive shielding units of each layer of the circuit board is composed of the blind hole shown in 72 (the hole is formed by laser penetrating the insulating layer, but the copper cladding layer of the lower circuit cannot be penetrated, and the copper cladding in the hole is connected to the copper cladding layer of the lower circuit) and the buried hole shown in 73. The interference electromagnetic waves emitted by the electrode film layer in the signal power supply layer C entering the blind hole and the buried hole are blocked by the independent conductive shielding unit copper cladding layer sheets of the internal and internal adjacent layers connected to the blind hole, so that the interference electromagnetic waves passing through the blind hole and the buried hole are completely blocked. Therefore, the interference electromagnetic waves passing through the gaps of the independent conductive shielding units and the signal power supply layer C of the blind hole and the buried hole are almost completely blocked, and the interference electromagnetic waves entering the blocked through hole are blocked by the blocked metal shielding.

[0138] Since the substrate of the multi-layer circuit board (the insulating layer of each layer of the circuit board) is very thin, generally only tens of microns, there are very few interfering electromagnetic waves that bypass the independent conductive shielding unit through the insulating gap, so that the multi-layer circuit board almost completely blocks the electromagnetic interference of the pressure signal power supply layer C to the multi-point flexible capacitive touch screen in the capacitive signal receiving layer A.

[0139] The electromagnetic interference of the pressure signal power supply layer C on the capacitive signal receiving layer A is almost completely blocked by the multi-layer circuit board in the interference shielding layer and electrical signal transmission layer B, so that the capacitive multi-point touch screen in A can work normally. By using the above-mentioned various methods, the ultra-thin flexible circuit board or the ultra-thin soft-hard combination circuit board almost completely blocks the electromagnetic interference of the pressure signal power supply layer C on the flexible capacitive screen in the capacitive signal receiving layer A, so that the multi-point flexible capacitive touch screen in A can work normally.

[0140] The independent conductive shielding units on the top layer of the multi-layer circuit board are electrically connected to the independent conductive shielding units on the bottom layer in the vertical direction through vias and through holes. Therefore, when the pressure signal power supply layer C and the capacitor signal receiving layer A are simultaneously in small contact due to pressure, the electrical signal of the pressure signal power supply layer C can be transmitted to the capacitor signal receiving layer A through many independent conductive shielding units at the contact parts of the top layer, the bottom layer, the C layer and the A layer.

[0141] In this embodiment, Fig.17 As shown, the capacitive signal receiving layer A is composed of capacitive touch screen protection layer 1 2 (plastic protection layer), flexible multi-point capacitive touch screen layer 3, and capacitive touch screen protection layer 2 4 (plastic protection layer) from top to bottom, which can be bonded by adhesive. Below is the anti-interference shielding layer 18, which can be a multi-layer ultra-thin circuit board with multiple layers of surfaces covered with small independent conductive shielding units that are closely spaced and insulated from each other, and each independent unit is staggered in the vertical direction to block the insulation gap between the small independent conductive units.

[0142] In this embodiment, when the screen is not touched by pressure, the flexible capacitive touch screen arranged above the display screen completely shields the interference radiation of the electrode plate of the pressure signal power supply layer C due to the shielding effect of the flexible display screen below and the metal shielding layer under the display screen, and the flexible capacitive touch screen above the screen can work normally without interference. When the screen is only touched by a finger, the flexible capacitive touch screen on the display screen receives the finger capacitive touch signal, inputs it into the touch screen chip and the computer, and displays the finger touch track on the screen. When the top of the screen is touched by the pressure of the pen tip, the surface covering layer of the touch screen is relatively stiff, and the point pressure received at the pen tip and other parts will press down a small, approximately circular depression near the pen tip, forming a small local surface pressure. This surface pressure is transmitted downward through the flexible capacitive touch screen to the flexible display screen, and continues to transmit the pressure downward to compress the electrode plate in the pressure signal power supply C, and passes through the isolation point layer to compress and contact the flexible multi-layer circuit board circuit of the conductive and shielding film layer in the interference shielding layer and electrical signal transmission layer B, or the multi-layer rigid circuit board connected by the flexible circuit board, or the multi-layer hard-soft circuit board circuit. Since the independent conductive shielding units corresponding to the vertical directions of the flexible multi-layer circuit board or the hard board of the hard board of the hard board of the multi-layer hard-soft circuit board or the multi-layer hard circuit board connected by the flexible circuit board are electrically conductive to each other, the small conductive shielding unit in the pressure signal power supply C is pressed downward through the isolation point layer and contacts the conductive and shielding film layer in the interference shielding layer and electrical signal transmission layer B. The electric signal (current) of the electrode plate in the pressure signal power source C in the area range is transmitted downward in the hard board of the flexible multi-layer circuit board or the multi-layer hard-soft combination circuit board or the multi-layer hard-soft combination circuit board connected by the flexible circuit board through multiple independent conductive shielding units in the small contact area, but is not transmitted to other independent conductive shielding units outside the small area of ​​the flexible multi-layer circuit board or the multi-layer hard-soft combination circuit board hard board or the multi-layer hard-soft combination circuit board connected by the flexible circuit board due to pressure contact (because each layer of independent conductive shielding units is insulated from each other). The hard circuit board in the flexible multi-layer circuit board or the multi-layer hard-soft combination circuit board or the multi-layer hard circuit board connected by the flexible circuit board is depressed downward due to the small area pressure from above, penetrates the spacer layer and contacts the protective layer of the flexible capacitive touch screen A in the lower capacitive signal receiving layer. Fig.16As shown. The conductive and shielding film layer formed by the multi-layer rigid circuit connected by the flexible circuit board or the flexible multi-layer circuit board or the soft-hard combination circuit board is in contact with the capacitive touch screen protective layer. The multiple independent conductive shielding units transmit the current signal (capacitive signal) to the flexible capacitive touch screen protective layer. Since the protective layer is very thin and has a high dielectric constant, the capacitive signal is transmitted to the flexible capacitive touch screen. The capacitive touch screen chip calculates the exact coordinates of the pen tip pressure point through the algorithm software (such as the center of gravity algorithm) of the small area capacitance signal received. The smaller the area of ​​the independent conductive shielding unit, the higher the accuracy of the pressure point coordinates. The pressure point is displayed on the screen, and then the trajectory coordinates are formed. At this time, the parts of the screen touch device that are separated by the isolation layer and are not in contact due to pressure are blocked by the common shielding effect of the independent conductive shielding units and the soft board or shielding mesh circuit in the flexible multi-layer circuit board or the multi-layer hard-soft circuit board in the interference shielding and electrical signal transmission layer B, and the low dielectric constant of the air in the air layer formed by the isolation layer. The air layer blocks the transmission of capacitance, so that most of the interference capacitance signals formed by the pressure signal power supply layer C are blocked and cannot interfere with the normal operation of the multi-point flexible capacitive touch screen in the capacitance signal receiving layer A, so that the flexible multi-point capacitive screen can work normally. Since the flexible capacitive touch screen supports multi-touch, multiple pressure points on the screen can be converted into capacitance signals input into the flexible capacitive touch screen and displayed on the screen. When the pressure point such as the pen tip on the screen surface is removed, the layers such as the flexible multilayer circuit board return to their original state without pressure due to their own toughness and elasticity, and under the action of the spacer layer, the corresponding layers break contact and return to their original flat state without pressure, disconnecting the electrical path for the conductive film layer connected to the power supply in the pressure signal power supply layer C to transmit signals to the multi-point capacitive touch screen in the capacitive signal receiving layer A. The multi-point capacitive touch screen cannot receive the signal and the handwriting will not be displayed on the screen. When the pressure point such as the pen tip moves on the screen, the layers in the original area near the pressure point return to their original flat state due to their own toughness and elasticity when the pressure point is removed, and the layers separate under the action of the spacer layer, and the circuit for transmitting signals from the pressure signal power supply layer C in the original pressure area to the multi-point capacitive touch screen in the capacitive signal receiving layer A is disconnected, and the capacitive touch screen has no input signal. In the vicinity where the pressure point such as the pen tip moves, the layers touch each other under the pressure, the signal transmission circuit is turned on, and the multi-point capacitive touch screen in the capacitive signal receiving layer A receives the electrical signal from the pressure signal power layer C. The area pressed by the pressure point such as the pen tip is approximately a circular area, and the chip can calculate and determine the position of the pressure point through the center of gravity algorithm software. When the pressure point moves on the screen, the moving track is displayed on the screen.

[0143] For independent conductive shielding units with corresponding conduction in the first and last layers, the electromagnetic waves interfering with the insulating lines of each unit need to be blocked in the vertical direction of the circuit board, and the fixed positions on the plane of the circuit board are staggered. This will cause a fixed difference in the size of the small circular area pressed by the pressure point of the screen and the area formed by the independent conductive shielding unit group of the last layer of the flexible multi-layer board that contacts the protective layer of the flexible capacitive screen to generate a capacitive signal. The area formed by the last layer of independent conductive shielding unit group contacting the touch screen protective layer will be missing a piece in a fixed position. This can be corrected by re-producing special correction software to display the correct pressure point coordinate position.

[0144] In one embodiment, for a flexible capacitive touch screen and its chip control software that partially supports multi-point input function, it has the function of not displaying the capacitive signal inputted from a large area of ​​the screen, such as the large area capacitive input signal inputted by palm contact, on the screen through the palm touch suppression function set by the software in advance, and only displaying the small area capacitive signal inputted. If a flexible touch screen and software with such function are used, the palm of a hand holding any hard pen is naturally placed on the screen and the pen tip is naturally used to write, and the large area pressure signal inputted by the palm of the hand holding the pen pressing on the screen by the finger supporting the pen is converted into a large area capacitive signal, which is shielded by the software set in the capacitive control chip and is not displayed on the display screen, and only the small area capacitive signal converted from the small area pressure part area near the pen tip is displayed on the screen through the pen tip coordinate signal converted by the software, so that the hand can be naturally placed on the screen of a tablet computer and the like and the text graphics can be written on the screen with any hard pen. The display screen only displays the content written by the hard pen. This embodiment provides a screen hardware foundation for realizing the functional effect of naturally placing the hand on the tablet computer screen and writing with any hard pen and only displaying the written content.

[0145] In one embodiment, the computer touch input device is arranged as a pad at the bottom of the paper, and the insulating covering layer is used to receive and transmit the pressure signal generated by the pen writing on the paper; wherein,

[0146] The computer touch input device comprises an insulating covering layer, a pressure touch film main layer and an anti-interference shielding layer stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with a pressure signal power supply layer, an interference shielding and electrical signal transmission layer, and a capacitive signal receiving layer; or,

[0147] The computer touch input device includes the insulating covering layer, the anti-interference shielding layer 1, the pressure touch film main layer and the anti-interference shielding layer 2 which are stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with the capacitive signal receiving layer, the interference shielding and electrical signal transmission layer, and the pressure signal power supply layer.

[0148] In this embodiment, the insulating covering layer in the touch screen (film), the pressure signal power supply layer C, the interference shielding and electrical signal transmission layer B, the capacitive signal receiving layer C, and the shielding layer in the main layer of the pressure touch film can be made into a pressure touch panel (film), and the structure is as follows: Fig.29 , wherein F5 represents a supporting substrate layer, which is generally a plastic substrate. The insulating cover layer 1, the anti-interference shielding layer 17, the pressure touch film main layer 100, the anti-interference shielding layer 18 and the supporting substrate layer F5 constitute this pressure touch panel, and F6 represents a main controller with a battery, a device connected to a computer, and a touch capacitive screen chip. This pressure touch panel is connected to the capacitive screen chip, and is connected to the computer by wire through an adapter card and a USB interface, or a battery, a circuit processing module, etc. are added to connect to the computer through a wireless signal transmitter, etc. This pressure touch panel (film) can be used as a pad, pad under paper or a notebook, and the content written on the paper with a hard pen is transmitted to this pressure touch screen panel (film) due to the pressure, and can be transmitted to the computer for processing. This pressure touch panel (film) has an appearance structure like an ordinary writing pad, which is bendable and easy to carry. When used, it is inserted into a notebook and padded under the paper. The content written on the paper or notebook with a hard pen can be transmitted to the computer for processing, which can facilitate applications such as real-time correction in teaching.

[0149] The computer touch input device provided by the present invention is introduced in detail above. The principle and implementation mode of the present invention are explained in this article by using specific examples. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

[0150] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A computer touch input device, characterized in that: include: A capacitive signal processing circuit, a pressure touch film main layer, and an insulating covering layer located on the surface of the pressure touch film main layer; The main layer of the pressure touch film includes a pressure signal power supply layer, an interference shielding and electrical signal transmission layer, and a capacitive signal receiving layer which are stacked in sequence, wherein: A capacitive signal receiving layer, used for receiving the electrical signal to form a capacitive touch signal, and transmitting the capacitive touch signal to the capacitive signal processing circuit; the capacitive signal receiving layer comprises a capacitive touch screen protection layer 1, a flexible multi-point capacitive touch screen layer and a capacitive touch screen protection layer 2 which are stacked in sequence; The interference shielding and electrical signal transmission layer is used to shield the interference of the pressure signal power supply layer in the area without pressure signal, and transmit the electrical signal to the capacitive signal receiving layer in the area with pressure signal; the interference shielding and electrical signal transmission layer includes a plurality of spacer layer 1s, a conductive and shielding film layer and a plurality of spacer layer 2s which are stacked in sequence; the plurality of spacer layer 1s are arranged adjacent to the capacitive touch screen protection layer 2; an air layer is formed between the spacer layer 1 and the plurality of spacers attached to the spacer layer 2, and the spacer layer 1 is used to isolate the capacitive touch screen protection layer 2 from the conductive and shielding film layer in the non-pressure state; the conductive and shielding film layer is used to shield the interference of the power conductive film layer in the area without pressure signal, and transmit the electrical signal of the power conductive film layer in the area with pressure signal; The pressure signal power supply layer is used to convert the pressure signal received and transmitted by the insulating covering layer into an electrical signal; the pressure signal power supply layer includes a power conductive film layer and a substrate film layer stacked in sequence; the power conductive film layer is adjacent to the plurality of spacer layers 2, and the spacer layer 2 is used to isolate the conductive and shielding film layer from the power conductive film layer in a pressure-free state; the power conductive film layer is a conductive film that is conductive to the power electrode.

2. A computer touch input device according to claim 1, characterized in that: The adjacent order of the pressure signal power supply layer, the interference shielding and electrical signal transmission layer and the capacitive signal receiving layer of the pressure touch film main layer is kept unchanged, and the pressure touch film main layer is forwardly arranged on the bottom layer of the insulating covering layer, or the pressure touch film main layer is invertedly arranged on the bottom layer of the insulating covering layer.

3. A computer touch input device according to claim 1, characterized in that: The pressure touch film main layer is arranged on the display screen surface, and each layer structure of the pressure touch film main layer and the insulating cover layer are made of transparent materials; the conductive and shielding film layer is an overall conductive transparent conductive film and is connected to the ground wire.

4. A computer touch input device according to claim 1, characterized in that: The main layer of the pressure touch film is arranged on the bottom surface of the display screen, the insulating covering layer is arranged on the surface of the display screen and is made of a transparent material, and the display screen is a flexible display screen; the surface and the bottom surface of the main layer of the pressure touch film are both provided with an anti-interference shielding layer, which is used to shield the capacitive interference and electromagnetic interference between the main layer of the pressure touch film and the display screen and the capacitive signal processing circuit.

5. A computer touch input device according to claim 4, characterized in that: A flexible capacitive touch screen is arranged between the insulating cover layer and the display screen.

6. A computer touch input device according to claim 4, characterized in that: The anti-interference shielding layer includes a fully covered conductive film layer or a multi-layer circuit board; the surface of each layer of the circuit board is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, the independent conductive shielding units between each layer of the circuit board are staggered, and the insulating gaps between the independent conductive shielding units of each layer of the circuit board in the vertical direction of the stacking are all covered by shielding.

7. A computer touch input device according to claim 4, characterized in that: The interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer is made of a multi-layer rigid circuit board or a multi-layer flexible circuit board that meets the vertical deformation requirements; wherein, Each layer of rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of rigid circuit board are staggered and distributed with each other, and the insulating gaps between the independent conductive shielding units of each layer of rigid circuit board in the vertical direction of the stacking are all shielded and covered, so as to shield the electromagnetic interference passing through the insulating gaps of the independent conductive shielding units in each layer of rigid circuit board; the independent conductive shielding units corresponding to the top rigid circuit board and the bottom rigid circuit board are electrically connected by vias, so as to transmit the electrical signal of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked by metal to shield the capacitive interference and electromagnetic interference passing through the vias; Each layer of flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly covered with independent conductive shielding units that are spaced less than a specified distance and insulated from each other. The independent conductive shielding units between each layer of flexible circuit boards are staggered and distributed with each other, and the insulating gaps between the independent conductive shielding units of each layer of flexible circuit boards in the vertical direction of the stacking are all shielded and covered, so as to shield the electromagnetic interference passing through the insulating gaps of the independent conductive shielding units in each layer of flexible circuit boards; the independent conductive shielding units corresponding to the top flexible circuit board and the bottom flexible circuit board are electrically connected by vias, so as to transmit the electrical signal of the pressure signal power supply layer to the capacitive signal receiving layer, and the vias are blocked by metal to shield the capacitive interference and electromagnetic interference passing through the vias; The independent conductive shielding unit is made of a conductive material with a conductivity coefficient greater than a set threshold.

8. A computer touch input device according to claim 4, characterized in that: The display screen is a foldable display screen; the interference shielding and electrical signal transmission layer is provided with a conductive and shielding film layer, and the conductive and shielding film layer adopts a soft-hard combination circuit board that meets the vertical deformation requirements; The hard-soft combined circuit board comprises a multi-layer rigid circuit board connected by a multi-layer flexible circuit board; each layer of the rigid circuit board adopts a rigid substrate, and the surface of the rigid substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other, and the independent conductive shielding units between the multi-layer rigid circuit boards are staggered, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the stacking are all shielded and covered, and the independent conductive shielding units corresponding to the top layer of the rigid circuit board and the bottom layer of the rigid circuit board are electrically connected through vias; the multi-layer flexible circuit board is located in the folding area, and a groove is provided on one side edge of the rigid circuit board of the middle layer, and the edge of the flexible circuit board is inserted into the groove to fix the flexible circuit board; the independent conductive shielding units in the rigid circuit boards of the remaining layers are staggered in the vertical direction of the groove, and the insulating gaps between the independent conductive shielding units of each layer of the rigid circuit board in the vertical direction of the groove are all shielded and covered; the multi-layer flexible circuit board is a multi-layer circuit board, and each layer of the flexible circuit board adopts a flexible substrate, and the surface of the flexible substrate is evenly distributed with independent conductive shielding units that are spaced less than a specified distance and insulated from each other; The independent conductive shielding unit is made of a conductive material with a conductivity coefficient greater than a set threshold.

9. The computer touch input device according to claim 1, characterized in that: The computer touch input device is arranged as a pad at the bottom of the paper, and the insulating covering layer is used to receive and transmit the pressure signal generated by the pen writing on the paper; wherein, The computer touch input device comprises the insulating covering layer, the pressure touch film main layer and the anti-interference shielding layer stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with a pressure signal power supply layer, the interference shielding and electrical signal transmission layer, and the capacitive signal receiving layer; or, The computer touch input device includes the insulating covering layer, the anti-interference shielding layer 1, the pressure touch film main layer and the anti-interference shielding layer 2 which are stacked in sequence from top to bottom; the pressure touch film main layer is stacked in sequence from top to bottom with the capacitive signal receiving layer, the interference shielding and electrical signal transmission layer, and the pressure signal power supply layer.

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