Touch display substrate

Abstract

The embodiment of the utility model provides a touch display substrate, and relates to the technical field of touch display. The touch display substrate comprises a liquid crystal panel and a backlight module. The liquid crystal panel comprises a touch sensor and a transparent shielding layer, and the backlight module comprises a back plate; the transparent shielding layer is arranged between the touch sensor and the backlight module, the transparent shielding layer is not grounded, and the backboard is grounded. In the embodiment of the utility model, the transparent shielding layer is not grounded, the transparent shielding layer can generate electrostatic balance in an electric field, the surface of the transparent shielding layer is an equipotential surface, and the back plate is grounded, so that the potential between the transparent shielding layer and the back plate is always unchanged; in this way, the potential between the transparent shielding layer and the back plate cannot be changed, so that extra capacitance cannot be generated and collected by the touch sensor, touch data of a diffusion part formed by the generated extra capacitance in related technologies can be eliminated, and the sensitivity of a touch display product is improved.

Description

Technical Field

[0001] This utility model relates to the field of touch display technology, and in particular to a touch display substrate. Background Technology

[0002] In-cell touchscreen technology (embedding touch panel functionality into liquid crystal pixels) divides the Vcom electrode layer on a TFT (Thin Film Transistor) substrate into independent small electrode areas. Touch functionality is achieved using a single-layer self-capacitance technique. After the TFT substrate and CF (Color Filter) substrate are bonded together to form a cell, the touch sensor layer is located within the cell, hence the name In-cell. In-cell technology offers advantages such as simple manufacturing process, low cost, thinness, and high light transmittance, making it suitable for narrow-bezel touch display product designs, and its application is already quite widespread.

[0003] However, since the In-cell design is self-capacitive, it collects all changes in capacitance value in the vertical direction of the Touch Sensor. When the In-cell product is pressed by a finger or palm, the Open Cell (LCD panel) will deform, and an additional capacitance will be generated between the Touch Sensor and the back panel. After this capacitance is collected by the Touch Sensor, it will form the touch data of the diffuse part, which will cause the actual touch point to be submerged, resulting in low sensitivity of the touch display product. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a touch display substrate to improve the sensitivity of touch display products. The specific technical solution is as follows:

[0005] In a first aspect, embodiments of the present invention provide a touch display substrate, the touch display substrate comprising:

[0006] LCD panel and backlight module;

[0007] The liquid crystal panel includes a touch sensor and a transparent shielding layer, and the backlight module includes a back plate;

[0008] The transparent shielding layer is disposed between the touch sensor and the backlight module, and the transparent shielding layer is not grounded, while the back plate is grounded.

[0009] In one possible implementation,

[0010] The backlight module further includes: a reflective sheet, a light guide plate, and a thin film, wherein the back plate includes a first back plate portion and a second back plate portion;

[0011] The liquid crystal panel further includes: a first polarizer, a first glass substrate, a liquid crystal layer, a second glass substrate, and a second polarizer;

[0012] The first back plate portion is disposed along the display plane direction of the touch display substrate, and the second back plate portion is disposed along the thickness direction of the touch display substrate; the reflective sheet is disposed on the first back plate portion, the light guide plate is disposed on the side of the reflective sheet away from the first back plate portion, and the thin film is disposed on the side of the light guide plate away from the first back plate portion.

[0013] The transparent shielding layer is disposed on the side of the first polarizer away from the first back plate, the first glass substrate is disposed on the side of the transparent shielding layer away from the first back plate, the touch sensor is disposed on the side of the first glass substrate away from the first back plate, the liquid crystal layer is disposed on the side of the touch sensor away from the first back plate, the second glass substrate is disposed on the side of the liquid crystal layer away from the first back plate, and the second polarizer is disposed on the side of the second glass substrate away from the first back plate.

[0014] In one possible implementation, in the thickness direction of the touch display substrate, the second backplate portion extends from the first backplate portion to the thin film.

[0015] In one possible implementation, in the thickness direction of the touch display substrate, the second back plate portion extends from the first back plate portion to the second glass substrate;

[0016] The touch display substrate also includes a first insulating tape; the first insulating tape is disposed between the second back plate portion and the liquid crystal panel.

[0017] In one possible implementation, the touch display substrate further includes a letterpress adhesive and a second insulating tape;

[0018] In the display plane direction of the touch display substrate, the second insulating tape is disposed on the edge of the fan-out side of the liquid crystal panel, and the square adhesive is disposed on the edges of the three sides of the liquid crystal panel other than the fan-out side; the second insulating tape and the square adhesive are disposed between the liquid crystal panel and the backlight module.

[0019] In one possible implementation, the second projection falls within the first projection, wherein the first projection is the projection of the transparent shielding layer onto the backlight module, and the second projection is the projection of the touch sensor onto the backlight module.

[0020] In one possible implementation, the four corners of the first glass substrate near the transparent shielding layer are rounded, and the four sides of the first glass substrate near the transparent shielding layer are C-shaped.

[0021] In one possible implementation, among the four sides of the first glass substrate near the transparent shielding layer, the width of the C-corner of the first side near the fan-out side is 800μm-1200μm, and the width of the C-corner of the other three sides is 100μm-500μm.

[0022] In one possible implementation, the thickness of the first glass substrate is greater than 0 and less than or equal to 0.4 mm, and the thickness of the second glass substrate is greater than 0 and less than or equal to 0.4 mm.

[0023] or,

[0024] The thickness of the first glass substrate is greater than or equal to 0.4 mm and less than or equal to 0.8 mm, and the thickness of the second glass substrate is greater than 0 and less than or equal to 0.4 mm.

[0025] In one possible implementation, the touch display substrate further includes optical adhesive;

[0026] The optical adhesive is disposed between the liquid crystal panel and the backlight module.

[0027] In one possible implementation, the distance between the touch sensor and the back panel is 2.mm-2.4mm.

[0028] Secondly, the present invention provides a touch display screen, wherein the touch display substrate includes any of the touch display substrates described in the first aspect.

[0029] The touch display substrate provided in this embodiment includes a liquid crystal panel and a backlight module. The liquid crystal panel includes a touch sensor and a transparent shielding layer. The transparent shielding layer is disposed between the touch sensor and the backlight module and is not grounded. In this embodiment, the transparent shielding layer is not grounded. Because the transparent shielding layer will achieve electrostatic equilibrium in an electric field, its surface is an equipotential surface. Since the back plate is grounded, the potential between the transparent shielding layer and the back plate remains constant. Even if the liquid crystal panel is deformed due to a finger or palm pressing it, the potential between the transparent shielding layer and the back plate will not change. Therefore, no additional capacitance is generated that is collected by the touch sensor. This eliminates the diffusion of touch data caused by the additional capacitance generated between the touch sensor and the back plate in related technologies, thereby improving the sensitivity of the touch display product.

[0030] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0032] Figure 1 This is a schematic diagram of a touch display substrate structure in related technologies;

[0033] Figure 2a This is a schematic diagram illustrating the touch effect of a touch display screen when lightly pressed by two fingers in related technologies.

[0034] Figure 2b This is a schematic diagram illustrating the touch effect of a touch display screen under two-finger pressure in related technologies.

[0035] Figure 2c This is a schematic diagram illustrating the touch effect of a touch display screen under heavy pressure from a hand in related technologies.

[0036] Figure 3 This is a schematic diagram of the structure of the first type of touch display substrate provided in the embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of the structure of the second type of touch display substrate provided in an embodiment of the present utility model;

[0038] Figure 5 This is a schematic diagram of the structure of a third type of touch display substrate provided in an embodiment of the present utility model;

[0039] Figure 6a This is a schematic diagram of the structure of the fourth type of touch display substrate provided in the embodiments of this utility model;

[0040] Figure 6b A top view schematic diagram of the fourth type of touch display substrate provided in the embodiments of this utility model;

[0041] Figure 6c A cross-sectional schematic diagram of the fan-out side of the touch display substrate provided in an embodiment of this utility model;

[0042] Figure 6d A schematic diagram of the curved surface of a first glass substrate with C-shaped corners on all four sides, provided for an embodiment of this utility model;

[0043] Figure 6e This is a schematic diagram of one C-angle in an embodiment of the present utility model;

[0044] Figure 7This is a schematic diagram of the structure of the fifth type of touch display substrate provided in the embodiments of this utility model;

[0045] Figure 8 A schematic diagram illustrating the touch effect of a touch display screen under heavy pressure from a hand, as provided in an embodiment of this utility model.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100-LCD panel; 110-Touch sensor; 120-Transparent shielding layer; 130-First polarizer; 140-First glass substrate; 150-LCD layer; 160-Second glass substrate; 170-Second polarizer; 200-Backlight module; 210-Back panel; 211-First back panel portion; 212-Second back panel portion; 220-Reflective sheet; 230-Light guide plate; 240-Thin film; 241-First diffusion film; 242-First prism film; 243-Second prism film; 244-Second diffusion film; 310-First insulating tape; 320-Second insulating tape; 400-U-shaped adhesive; 500-Frame; 600-Edge shielding layer; 700-Frame sealing adhesive; 800-Light emitting diode; 900-Light emitting diode reflective tape; 1000-Basic control panel; 1100-Optical adhesive. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application are within the protection scope of the present utility model.

[0049] In-cell touchscreen technology (embedding touch panel functionality into liquid crystal pixels) divides the Vcom electrode layer on a TFT (Thin Film Transistor) substrate into independent small electrode areas. Touch functionality is achieved using a single-layer self-capacitance technique. After the TFT substrate and CF (Color Filter) substrate are bonded together to form a cell, the touch sensor layer is located within the cell, hence the name In-cell. In-cell technology offers advantages such as simple manufacturing process, low cost, thinness, and high light transmittance, making it suitable for narrow-bezel touch display product designs, and its application is already quite widespread.

[0050] However, the In-cell design is self-contained, see [link / reference]. Figure 1This is a schematic diagram of a touch display substrate structure in related technologies. The change in capacitance of the touch sensor in the vertical direction is collected. Here, Cf refers to the capacitance between the touch sensor and the finger or palm after touching the screen, and Cp is the parasitic capacitance, referring to the capacitance between the touch sensor and the back panel. When an In-cell product is pressed by a finger or palm, the OC (Open Cell, LCD panel) will deform. According to the capacitance calculation formula:

[0051]

[0052] Where C represents the capacitance of the two plates, ε0 is the vacuum dielectric constant, ε is the dielectric constant of the two plate materials, A represents the overlapping area of ​​the two plates, and d represents the distance between the two plates. Figure 1 In Cf, d represents the distance between the finger or palm touching the display and the touch sensor, while d represents the distance between the touch sensor and the back panel. When an In-cell product is pressed by a finger or palm, OC deforms, and d of Cp decreases. Since ε0 and ε are constants and A remains unchanged, Cp increases. This means that an additional capacitance is generated between the touch sensor and the back panel. This capacitance, after being collected by the touch sensor, forms the diffused touch data, causing the actual touch point to be submerged, resulting in lower sensitivity of the touch display product.

[0053] See Figure 2a , Figure 2b and Figure 2c The images show the touch effects of a touch display screen under light pressure from two fingers, heavy pressure from two fingers, and heavy pressure from the palm, respectively. It can be seen that when lightly pressing with two fingers, the touch data does not spread. However, when heavy pressure is applied with two fingers and heavy pressure is applied with the palm, the touch data shows obvious spreading, causing the actual touch points to be submerged.

[0054] To address the issue of data diffusion at touch points and improve the sensitivity of touch display products, this invention provides a touch display substrate. The details are as follows:

[0055] A first aspect of this utility model is to provide a touch display substrate, see [link to relevant documentation]. Figure 3 , Figure 3 This is a schematic diagram of the structure of a first type of touch display substrate provided in an embodiment of the present invention. The touch display substrate includes:

[0056] LCD panel 100 and backlight module 200;

[0057] The liquid crystal panel 100 includes a touch sensor 110 and a transparent shielding layer 120, and the backlight module 200 includes a back plate 210.

[0058] The transparent shielding layer 120 is disposed between the touch sensor 110 and the backlight module 200, and the transparent shielding layer 120 is not grounded, while the back plate 210 is grounded.

[0059] In this embodiment of the invention, the touch sensor 110 is located inside the liquid crystal panel 100. The liquid crystal panel 100 also includes a transparent shielding layer 120, which is disposed between the touch sensor 110 and the backlight module 200. The transparent shielding layer 120 is not grounded. The backlight module 200 provides a light source to provide basic brightness for the display screen. The liquid crystal panel 100 modulates light by controlling the alignment of liquid crystal molecules, thereby changing the direction and intensity of light propagation to form different images. The touch sensor 110 can detect and collect the capacitance changes of Cf and Cp caused by a finger or palm touching the display screen. The transparent shielding layer 120 is a transparent conductive material; in one example, the material of the transparent shielding layer 120 is ITO (Indium Tin Oxide).

[0060] The backlight module 200 includes a backplate 210, which primarily serves to support and protect the display screen. Located on the back of the display screen, the backplate 210 is typically made of metal materials such as aluminum alloy or stainless steel, possessing high mechanical strength and good thermal conductivity. The design of the backplate 210 effectively prevents the display screen from external physical damage, while also helping to disperse and dissipate heat generated during use, extending the lifespan of the display screen. Furthermore, grounding the backplate 210 prevents electrostatic interference and electromagnetic leakage, ensuring the normal operation of the display substrate.

[0061] In one example, such as Figure 3 As shown, the touch display substrate also includes a rectangular adhesive 400. The rectangular adhesive 400 can be used to bond the liquid crystal panel 100 to the backlight module 200, and create an air layer between them.

[0062] The touch display substrate provided by this utility model, because the transparent shielding layer 120 is a conductor, will achieve electrostatic equilibrium in an electric field. When the transparent shielding layer 120 is not grounded, the potential on the surface of the transparent shielding layer 120 is equal everywhere. Figure 3As shown, V2 = V1 = V0. The equation still holds when the liquid crystal panel 100 is deformed. Since the back plate 210 is grounded, the potentials of the transparent shielding layer 120 and the back plate 210 are constant. Even if the liquid crystal panel 100 is deformed after being pressed by a finger or palm, the potential between the transparent shielding layer 120 and the back plate 210 will not change, that is, the value of Cp will not change. Therefore, no additional capacitance will be generated and collected by the touch sensor. This can eliminate the touch data of the diffusion part formed by the additional capacitance generated between the touch sensor and the back plate in the related technology, thereby improving the sensitivity of the touch display substrate.

[0063] In one possible implementation, see Figure 4 This is a schematic diagram of the structure of the second type of touch display substrate provided in the embodiment of the present utility model. The backlight module 200 further includes: a reflective sheet 220, a light guide plate 230, and a thin film 240. The back plate 210 includes a first back plate portion 211 and a second back plate portion 212.

[0064] The liquid crystal panel 100 further includes: a first polarizer 130, a first glass substrate 140, a liquid crystal layer 150, a second glass substrate 160, and a second polarizer 170.

[0065] The first back plate portion 211 is disposed along the display plane direction of the touch display substrate, and the second back plate portion 212 is disposed along the thickness direction of the touch display substrate; the reflective sheet 220 is disposed on the first back plate portion 211, the light guide plate 230 is disposed on the side of the reflective sheet 220 away from the first back plate portion 211, and the thin film 240 is disposed on the side of the light guide plate 230 away from the first back plate portion 211.

[0066] The transparent shielding layer 120 is disposed on the side of the first polarizer 130 away from the first back plate portion 211, the first glass substrate 140 is disposed on the side of the transparent shielding layer 120 away from the first back plate portion 211, the touch sensor 110 is disposed on the side of the first glass substrate 140 away from the first back plate portion 211, the liquid crystal layer 150 is disposed on the side of the touch sensor 110 away from the first back plate portion 211, the second glass substrate 160 is disposed on the side of the liquid crystal layer 150 away from the first back plate portion 211, and the second polarizer 170 is disposed on the side of the second glass substrate 160 away from the first back plate portion 211.

[0067] In this embodiment of the invention, the reflective sheet 220 is mainly used to reflect light, reduce light loss, improve light utilization efficiency, increase backlight brightness, and enhance display effect. The reflective sheet 220 can be made of metal, such as aluminum, silver, copper, etc. However, since materials such as aluminum, silver, and copper are easily oxidized in air and their performance is reduced, a dielectric film is generally added for protection. Commonly used protective film materials include silicon monoxide, magnesium fluoride, silicon dioxide, and aluminum oxide.

[0068] The main function of the light guide plate 230 is to transform a line light source into a surface light source, allowing light to be emitted evenly and improving the display effect. The material of the light guide plate 230 is usually PMMA (Polymethyl Methacrylate), PC (Polycarbonate), or a modified titanium dioxide polycarbonate composite material, which can improve light transmission efficiency, reduce light reflection and refraction loss at the interface, reduce light leakage problems, and improve the stability of the light guide plate 230.

[0069] The thin film 240 may include multiple layers, primarily based on optical principles to improve display performance. For example, such as... Figure 4 As shown, the film 240 includes a first diffusion film 241, a first prism film 242, a second prism film 243, and a second diffusion film 244. The first diffusion film 241 is disposed on the side of the light guide plate 230 away from the first back plate portion 211, the first prism film 242 is disposed on the side of the first diffusion film 241 away from the first back plate portion 211, the second prism film 243 is disposed on the side of the first prism film 242 away from the first back plate portion 211, and the second diffusion film 244 is disposed on the side of the second prism film 243 away from the first back plate portion 211.

[0070] A polarizer is an optical element that selectively allows light from a specific direction to pass through while blocking light from other directions, thus controlling the direction and intensity of light to achieve optimal display effects. In this embodiment of the invention, the first polarizer 130 and the second polarizer 170 are located at the upper and lower ends of the liquid crystal panel 100, respectively. Typically, the first polarizer 130 and the second polarizer 170 are set perpendicular to each other, for example, one can be set to 0 degrees and the other to 90 degrees. This ensures that only light from a specific direction can pass through (e.g., one polarizer filters light in the X direction, and the other polarizer filters light in the Y direction), thereby improving the clarity and color saturation of the display. The materials of the first polarizer 130 and the second polarizer 170 can usually be PVA (Polyvinyl Alcohol). However, since PVA is extremely easy to hydrolyze, in order to protect the physical properties of the polarizer, a layer of TCA (Tri-cellulose Acetate) film with high light transmittance, good water resistance and certain mechanical strength can usually be laminated on both sides of the PVA for protection. In addition, reflective film, phase difference film, protective film, etc. can also be laminated according to actual needs.

[0071] The first glass substrate 140 is mainly used to control the light transmission intensity of the pixels, and the second glass substrate 160 is mainly used for color generation and filtering. In one example, the first glass substrate 140 is a TFT glass substrate, the second glass substrate 160 is a CF glass substrate, and a touch sensor 110 and a liquid crystal layer 150 are sandwiched between the TFT glass substrate and the CF glass substrate. The backlight passes sequentially through the voltage regulation layer of the TFT glass substrate, the liquid crystal layer 150, and the filter layer of the CF glass substrate, and finally outputs a color image.

[0072] The backplate 210 includes a first backplate portion 211 disposed along the display plane direction of the touch display substrate and a second backplate portion 212 disposed along the thickness direction of the touch display substrate.

[0073] In one possible implementation, such as Figure 4 As shown, in the thickness direction of the touch display substrate, the second back plate portion 212 extends from the first back plate portion 211 to the thin film 240.

[0074] In this embodiment of the present invention, the touch display substrate has an ultra-narrow bezel, and the second back plate portion 212 extends from the first back plate portion 211 to the thin film 240, but does not extend to the liquid crystal panel 100 portion. It should be noted that when attaching the edge shielding layer 600, the sharp corners of the liquid crystal panel 100 may pierce the edge shielding layer 600, which may cause the copper material of the edge shielding layer 600 to come into contact with the back plate 210, resulting in the transparent shielding layer 120 being grounded. In this case, the potential at the grounding point of the transparent shielding layer 120 will change abruptly, generating additional capacitance that is collected by the touch sensor 110, thereby causing the touch data to diffuse. In this case, the diffusion phenomenon will disappear after removing the edge shielding layer 600.

[0075] In another possible implementation, see Figure 5 This is a schematic diagram of the structure of a third type of touch display substrate provided in an embodiment of the present utility model. In the thickness direction of the touch display substrate, the second back plate portion 212 extends from the first back plate portion 211 to the second glass substrate 160. The touch display substrate also includes a first insulating tape 310. The first insulating tape 310 is disposed between the second back plate portion 212 and the liquid crystal panel 100.

[0076] In this embodiment of the present invention, the touch display substrate has a narrow bezel, the second back plate portion 212 extends from the first back plate portion 211 to the second glass substrate 160, the second back plate portion 212 extends to the liquid crystal panel 100 portion, and the position where the second back plate portion 212 contacts the liquid crystal panel 100 needs to be covered with the first insulating tape 310, so as to achieve insulation and adhesion between the back plate 210 and the liquid crystal panel 100.

[0077] It should be noted that when attaching the edge shielding layer 600, the sharp corner of the LCD panel 100 may pierce the first insulating tape 310, which may cause the transparent shielding layer 120 to come into contact with the back plate 210, resulting in the transparent shielding layer 120 being grounded. The potential at the grounding point of the transparent shielding layer 120 will change abruptly, generating additional capacitance that is collected by the touch sensor 110, thereby causing the touch data to diffuse.

[0078] In one possible implementation, the second projection falls within the first projection, wherein the first projection is the projection of the transparent shielding layer 120 onto the backlight module 200, and the second projection is the projection of the touch sensor 110 onto the backlight module 200.

[0079] In this embodiment of the present invention, the projection of the touch sensor 110 on the backlight module 200 falls within the projection of the transparent shielding layer 120 on the backlight module 200, that is, on the display plane of the touch display substrate, the transparent shielding layer 120 completely covers the touch sensor 110. Furthermore, the projection of the transparent shielding layer 120 on the backlight module 200 falls within the AA area (display area) of the touch display substrate, which can effectively prevent the transparent shielding layer 120 from conducting with the back plate 210, prevent the transparent shielding layer 120 from grounding, eliminate the diffusion phenomenon of touch data, thereby improving the sensitivity of the touch display substrate.

[0080] In one possible implementation, see Figure 6a and Figure 6b , Figure 6a This is a schematic diagram of the structure of the fourth type of touch display substrate provided in this embodiment of the present invention. Figure 6b This is a top view of the fourth type of touch display substrate provided in this embodiment of the present utility model. The four corners of the first glass substrate 140 near the transparent shielding layer 120 are rounded, and the four sides of the first glass substrate 140 near the transparent shielding layer 120 are C-shaped.

[0081] It should be noted that "C-angle side" refers to treating the right-angled side of an object by creating a C-angle, thus transforming it into a curved side. See also Figure 6d and Figure 6e , Figure 6d This is a schematic diagram of the curved surface of a first glass substrate 140 with C-shaped corners on all four sides, provided as an embodiment of the present invention. Figure 6e for Figure 6d The cross-sectional view of the dashed plane is shown in the figure. The angle of the C-angle side in the cross-sectional view is called the C-angle, and 'a' represents the width of the C-angle.

[0082] In this embodiment of the invention, by rounding the four corners of the first glass substrate 140 near the transparent shielding layer 120, and further by rounding the four sides of the first glass substrate 140 near the transparent shielding layer 120, it is possible to effectively prevent the sharp corners of the liquid crystal panel 100 from piercing the first insulating tape 310 or the edge shielding layer 600, thereby preventing the transparent shielding layer 120 from conducting with the back plate 210, preventing the transparent shielding layer 120 from grounding, eliminating the diffusion phenomenon of contact data, and thus improving the sensitivity of the touch display substrate. In one possible implementation, among the four sides of the first glass substrate 140 near the transparent shielding layer 120, the width of the C-corner of the first side near the fan-out side is 800μm-1200μm, and the width of the C-corner of the other three sides is 100μm-500μm.

[0083] In one possible implementation, see Figure 6bThe touch display substrate also includes a square adhesive 400 and a second insulating tape 320;

[0084] In the display plane direction of the touch display substrate, the second insulating tape 320 is disposed on the edge of the fan-out side of the liquid crystal panel 100, and the square adhesive 400 is disposed on the edges of the three sides of the liquid crystal panel 100 other than the fan-out side; the second insulating tape 320 and the square adhesive 400 are disposed between the liquid crystal panel 100 and the backlight module 200.

[0085] See Figure 6c This is a cross-sectional view of the fan-out side of the touch display substrate provided in this embodiment of the utility model. The liquid crystal panel 100 and the backlight module 200 are connected to the basic control panel (BCP) 1000 through the fan-out end. In the cross-sectional view of the fan-out side, it can be seen that the backlight module 200 also includes a light-emitting diode (LED) 800 and a light-emitting diode reflective tape 900.

[0086] In this embodiment of the present invention, the touch display substrate further includes a square adhesive 400 and a second insulating tape 320. The square adhesive 400 can reduce the manufacturing cost of the touch display substrate and leave an air layer between the liquid crystal panel 100 and the backlight module 200. The second insulating tape 320 can prevent the transparent shielding layer 120 from conducting with the back plate 210.

[0087] In one possible implementation, the width of the second insulating tape 320 is 0.03-0.1 mm, and the width of the square-shaped adhesive tape 400 is 1-5 mm. See also Figure 6b The width of the second insulating tape 320 / width of the square-shaped adhesive tape 400 refers to the length of the short side of the second insulating tape 320 / square-shaped adhesive tape 400.

[0088] In one example, such as Figure 4 , Figure 5 and Figure 6a As shown, the touch display substrate provided in this embodiment of the present invention also includes a frame 500 and a sealing adhesive 700. The frame 500 is usually made of injection-molded rigid plastic or composite material, and is mainly used to fix the liquid crystal panel 100 and the backlight module 200, and to provide mechanical support to prevent external pressure from causing structural deformation. The sealing adhesive 700 is usually a liquid or semi-solid adhesive (such as epoxy resin), which is coated and then cured by thermosetting or UV (Ultraviolet) to form a sealing layer. Its core function is to seal the edge of the display substrate to prevent moisture and dust from entering, and at the same time reduce light reflection interference.

[0089] In one possible implementation, the thickness of the first glass substrate 140 is greater than 0 and less than or equal to 0.4 mm, and the thickness of the second glass substrate 160 is greater than 0 and less than or equal to 0.4 mm.

[0090] or,

[0091] The thickness of the first glass substrate 140 is greater than or equal to 0.4 mm and less than or equal to 0.8 mm, and the thickness of the second glass substrate 160 is greater than 0 and less than or equal to 0.4 mm.

[0092] In this embodiment of the present invention, the thickness of the first glass substrate 140 is greater than 0 and less than or equal to 0.4 mm, and the thickness of the second glass substrate 160 is greater than 0 and less than or equal to 0.4 mm. As can be seen from the foregoing embodiments, the first glass substrate 140 is a TFT glass substrate, and the second glass substrate 160 is a CF glass substrate. By reducing the thickness of the TFT glass substrate and the CF glass substrate, since the capacitance is proportional to the reciprocal of the distance d, the strength of Cf can be increased, while the influence of Cp can be reduced, thereby improving the diffusion phenomenon of contact data.

[0093] Furthermore, the thickness of the glass substrate can be increased. In this embodiment of the invention, the thickness of the first glass substrate 140 is greater than 0.4 mm and equal to but less than or equal to 0.8 mm, and the thickness of the second glass substrate 160 is greater than 0 and less than or equal to 0.4 mm. In this case, the overall thickness of the display substrate remains unchanged, allowing it to match the customer's complete system. By reducing the capacitance d of Cf and increasing the capacitance d of Cp, with other parameters remaining constant, the capacitance of Cf increases while the change in capacitance of Cp is relatively small, greatly increasing the strength of Cf while reducing the influence of Cp, thus improving the diffusion phenomenon of contact data.

[0094] The presence of the adhesive 400 creates a gap between the liquid crystal panel 100 and the backlight module 200. In some embodiments, this gap can be filled with air. In other possible embodiments, a transparent material can be used for filling.

[0095] In one possible implementation, see Figure 7 This is a schematic diagram of the structure of the fifth type of touch display substrate provided in this embodiment of the present utility model. The touch display substrate further includes optical adhesive 1100.

[0096] The optical adhesive 1100 is disposed between the liquid crystal panel 100 and the backlight module 200.

[0097] In this embodiment of the invention, the touch display substrate further includes an optical adhesive 1100, such as... Figure 7As shown, the optical adhesive 1100 is disposed between the liquid crystal panel 100 and the backlight module 200. It is a transparent material that fills the air layer that originally existed between the liquid crystal panel 100 and the backlight module 200, preventing the formation of gaps between the liquid crystal panel 100 and the backlight module 200. This prevents capacitance changes caused by deformation of the liquid crystal panel 100 and improves the diffusion of contact data.

[0098] In one possible implementation, the distance between the touch sensor 110 and the back plate 210 is 2.4 mm to 2.4 mm.

[0099] In this embodiment of the invention, the distance between the touch sensor 110 and the backplate 210 can be increased by adjusting the thickness of the film layer inside the touch display substrate. This reduces capacitance changes caused by deformation of the liquid crystal panel 100 and improves the diffusion of touch data. In one example, when the touch display substrate is an a-Si (amorphous silicon) product, an organic film layer can be added between the touch sensor 110 and the backplate 210. In another example, when the touch display substrate is an oxide product, the thickness of the organic (ORG) film layer can be increased to 25000 Å.

[0100] In one possible implementation, the Young's modulus of the first glass substrate 140 and the second glass substrate 160 is 70-85 GPa.

[0101] In this embodiment of the present invention, the glass type of the first glass substrate 140 and the second glass substrate 160 can be Eagle. By selecting a glass substrate with a smaller Young's modulus, the deformation of the glass substrate is already large when the liquid crystal panel 100 is not pressed. The deformation caused by pressing the liquid crystal panel 100 is smaller compared with the previous deformation. This can reduce the influence of the additional capacitance caused by the deformation of the liquid crystal panel 100 when it is pressed, and improve the diffusion phenomenon of contact data.

[0102] Secondly, the present invention provides a touch display screen, wherein the touch display substrate includes any of the touch display substrates described in the first aspect.

[0103] The touch display screen provided by this utility model includes the touch display substrate described in any of the first aspects. Since the transparent shielding layer 120 of the touch display substrate is not grounded, while the back plate 210 is grounded, the potentials of both the transparent shielding layer 120 and the back plate 210 are constant. Even if the liquid crystal panel deforms, the potential between the transparent shielding layer 120 and the back plate 210 will not change. Therefore, no additional capacitance is generated that is collected by the touch sensor, which can eliminate the touch data diffusion caused by the additional capacitance generated between the touch sensor and the back plate in related technologies, thereby improving the sensitivity of the touch display screen. See also Figure 8 This is a schematic diagram illustrating the touch effect of the touch display screen provided in this embodiment of the present invention when subjected to heavy pressure from the palm of a hand, for comparison. Figure 2b and Figure 2c As can be seen, the diffusion phenomenon of contact data has disappeared.

[0104] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A touch display substrate, characterized in that, The touch display substrate includes: LCD panel and backlight module; The liquid crystal panel includes a touch sensor and a transparent shielding layer, and the backlight module includes a back plate; The transparent shielding layer is disposed between the touch sensor and the backlight module, and the transparent shielding layer is not grounded, while the back plate is grounded.

2. The touch display substrate according to claim 1, characterized in that, The backlight module further includes: a reflective sheet, a light guide plate, and a thin film, wherein the back plate includes a first back plate portion and a second back plate portion; The liquid crystal panel further includes: a first polarizer, a first glass substrate, a liquid crystal layer, a second glass substrate, and a second polarizer; The first back plate portion is disposed along the display plane direction of the touch display substrate, and the second back plate portion is disposed along the thickness direction of the touch display substrate; the reflective sheet is disposed on the first back plate portion, the light guide plate is disposed on the side of the reflective sheet away from the first back plate portion, and the thin film is disposed on the side of the light guide plate away from the first back plate portion. The transparent shielding layer is disposed on the side of the first polarizer away from the first back plate, the first glass substrate is disposed on the side of the transparent shielding layer away from the first back plate, the touch sensor is disposed on the side of the first glass substrate away from the first back plate, the liquid crystal layer is disposed on the side of the touch sensor away from the first back plate, the second glass substrate is disposed on the side of the liquid crystal layer away from the first back plate, and the second polarizer is disposed on the side of the second glass substrate away from the first back plate.

3. The touch display substrate according to claim 2, characterized in that, In the thickness direction of the touch display substrate, the second back plate portion extends from the first back plate portion to the thin film.

4. The touch display substrate according to claim 2, characterized in that, In the thickness direction of the touch display substrate, the second back plate portion extends from the first back plate portion to the second glass substrate; The touch display substrate also includes a first insulating tape; the first insulating tape is disposed between the second back plate portion and the liquid crystal panel.

5. The touch display substrate according to claim 1, characterized in that, The touch display substrate also includes adhesive tape and a second insulating tape. In the display plane direction of the touch display substrate, the second insulating tape is disposed on the edge of the fan-out side of the liquid crystal panel, and the square adhesive is disposed on the edges of the three sides of the liquid crystal panel other than the fan-out side; the second insulating tape and the square adhesive are disposed between the liquid crystal panel and the backlight module.

6. The touch display substrate according to claim 1, characterized in that, The second projection falls within the first projection, wherein the first projection is the projection of the transparent shielding layer on the backlight module, and the second projection is the projection of the touch sensor on the backlight module.

7. The touch display substrate according to claim 2, characterized in that, The four corners of the first glass substrate near the transparent shielding layer are rounded, and the four sides of the first glass substrate near the transparent shielding layer are C-shaped.

8. The touch display substrate according to claim 7, characterized in that, In the first glass substrate, on the side near the transparent shielding layer, the width of the C-corner of the first side near the fan-out side is 800μm-1200μm, and the width of the C-corner of the other three sides is 100μm-500μm.

9. The touch display substrate according to claim 2, characterized in that, The thickness of the first glass substrate is greater than 0 and less than or equal to 0.4 mm, and the thickness of the second glass substrate is greater than 0 and less than or equal to 0.4 mm; or, The thickness of the first glass substrate is greater than or equal to 0.4 mm and less than or equal to 0.8 mm, and the thickness of the second glass substrate is greater than 0 and less than or equal to 0.4 mm.

10. The touch display substrate according to claim 1, characterized in that, The touch display substrate also includes optical adhesive; The optical adhesive is disposed between the liquid crystal panel and the backlight module.

11. The touch display substrate according to claim 1, characterized in that, The distance between the touch sensor and the back panel is 2mm-2.4mm.

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