A new type of narrow bezel touch display

Abstract

The present invention discloses a novel narrow-frame touch display screen, wherein the capacitive sensing layer includes a first capacitive sensing layer signal area, a second capacitive sensing layer signal area, and a capacitive sensing layer film disposed between the first capacitive sensing layer signal area and the second capacitive sensing layer signal area; and the capacitive driving layer includes a first capacitive driving layer signal area, a second capacitive driving layer signal area, and a capacitive driving layer film disposed between the first capacitive driving layer signal area and the second capacitive driving layer signal area. The present invention transfers half the number of traces of the capacitive sensing layer and the capacitive driving layer signal area to the back of the capacitive sensing layer and the capacitive driving layer respectively by means of through-holes, and the sidewalls of the through-holes are printed with silver paste that can pass through the front and back of the capacitive sensing layer and the capacitive driving layer, which is equivalent to reducing the width of the capacitive sensing layer and the capacitive driving layer signal area by half, thereby reducing the width of the entire frame, making the frame narrower and the screen-to-body ratio higher.

Description

Technical Field

[0001] The present invention relates to a touch display screen, and in particular to a novel touch display screen with a narrow frame. Background Art

[0002] Since touch screens rapidly evolved from resistive to capacitive screens, they have been widely used in smartphones, tablets, e-books, watches, bracelets, automotive applications, industrial control systems, and medical applications. There are two types of capacitive touch screens: glass capacitive touch screens, which use a glass-like manufacturing process to create the capacitive sensing layer. These layers consist of glass with a specific capacitive sensing pattern. Thin-film capacitive touch screens, which use a thin-film manufacturing process to create the capacitive sensing layer, consist of a transparent conductive film with a specific capacitive sensing pattern. Due to factors such as their light weight, thinness, flexibility, and low price, the thin-film capacitive touch screen market far exceeds that of glass capacitive touch screens. Conventional touch screens use structures such as GFF / GF2 / OGS / OGM / GG. Their capacitive layer typically consists of edge traces and in-plane patterns. The line width and spacing of the edge traces, as well as the number of traces, determine the size of the bezel.

[0003] Conventional touch screens generally have larger borders, requiring more CG ink to cover the width of the borders. This cannot meet the requirements of ultra-narrow borders for touch screens, resulting in a low screen-to-body ratio of only 90%, affecting the user experience.

[0004] The schematic diagram of the conventional touch screen structure is as follows Figure 1 As shown, it mainly consists of a cover plate, an adhesive, a capacitor sensing layer signal area, a capacitor sensing layer film, an adhesive, a capacitor driving layer signal area, a capacitor driving layer film, an adhesive, and a liquid crystal display module. The capacitor sensing layer signal area and the capacitor sensing layer film constitute the capacitor sensing layer, which mainly plays the role of receiving signals. The capacitor driving layer signal area and the capacitor driving layer film constitute the capacitor driving layer, which mainly plays the role of transmitting signals.

[0005] Taking a 15-inch touch screen as an example, according to the 16:9 size of the AA area of the LCD module and the conventional line width and line spacing of 30um / 30um, the ground line width is 0.3mm, the distance from the line edge to the sensor edge is 0.4mm, the distance from the sensor edge to the CG edge is 0.4mm, the ground line to the signal area is 0.1mm, the overlap width of the silver paste and ITO is 0.3mm, and the overlap distance to VA is 0.5mm. The number of lines in the signal area of the sensing layer is 40, and the wiring structure diagram of the signal area of the capacitive sensing layer is as follows: Figure 2As shown, it consists of the first trace, the second trace, the third trace, the 19th trace, the 20th trace, the 21st trace, the 22nd trace, the 39th trace, the 40th trace, etc., and the signal area width is 2.4mm; the number of capacitor drive layer traces is 70, and the capacitor drive layer signal area trace structure diagram is as shown Figure 3 As shown in FIG, it is composed of the first trace, the second trace, the third trace, the 34th trace, the 35th trace, the 36th trace, the 37th trace, the 69th trace, the 70th trace, etc., and the width of the signal area is 4.2 mm; as shown in FIG. Figure 4 As shown in the figure, the total capacitance sensing layer border size is 4.4mm, including the ground line width, the distance from the edge of the trace to the edge of the sensor, the distance from the edge of the sensor to the CG edge, the ground line to the signal area, the overlap width of the silver paste and ITO, and the overlap to the VA distance; Figure 5 As shown, plus the ground line width, the distance from the edge of the trace to the edge of the sensor, the distance from the edge of the sensor to the CG edge, the ground line to the signal area, the overlap width of the silver paste and ITO, and the overlap to VA distance, the total capacitor drive layer border size is 6.2mm, and the touch screen border is very large. Summary of the Invention

[0006] To solve the above problems, the purpose of the present invention is to provide a new type of narrow-border touch display screen, which transfers half of the number of wiring in the signal area of the capacitive sensing layer and the capacitive driving layer to the back of the capacitive sensing layer and the capacitive driving layer respectively through through holes. The side walls of the through holes are printed with silver paste that can pass through the front and back of the capacitive sensing layer and the capacitive driving layer, which is equivalent to reducing the width of the signal area of the capacitive sensing layer and the capacitive driving layer by half, thereby reducing the width of the entire border, making the border narrower and the screen-to-body ratio higher.

[0007] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0008] A novel narrow-frame touch display screen includes a cover plate, a capacitive sensing layer, a capacitive drive layer, and a liquid crystal display module, arranged in order from top to bottom; a first adhesive is provided between the cover plate and the capacitive sensing layer, a second adhesive is provided between the capacitive sensing layer and the capacitive drive layer, and a third adhesive is provided between the capacitive drive layer and the liquid crystal display module; the capacitive sensing layer includes a first capacitive sensing layer signal region, a second capacitive sensing layer signal region, and a capacitive sensing layer film arranged between the first capacitive sensing layer signal region and the second capacitive sensing layer signal region; the capacitive drive layer includes a first capacitive drive layer signal region, a second capacitive drive layer signal region, and a capacitive drive layer film arranged between the first capacitive drive layer signal region and the second capacitive drive layer signal region.

[0009] Furthermore, the capacitive sensing layer film has a first through hole in the edge wiring region, and the first capacitive sensing layer signal region and the second capacitive sensing layer signal region are electrically connected through the first through hole.

[0010] Furthermore, the capacitor driving layer film has a second through hole in the edge wiring area, and the first capacitor driving layer signal area and the second capacitor driving layer signal area are connected through the second through hole.

[0011] Furthermore, the capacitive sensing layer film is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as the base material and ITO as the transparent conductive material, and the capacitive sensing pattern is obtained in the surface by exposure, development and etching.

[0012] Furthermore, the capacitor driving layer film is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as the base material and ITO as the transparent conductive material, and the capacitor driving pattern is obtained in its surface by exposure, development and etching.

[0013] Furthermore, the first adhesive, the second adhesive and the third adhesive are solid optically transparent adhesive, liquid silicone water glue or acrylic water glue, the thickness of the first adhesive is 50um, 75um, 100um or 125um, the thickness of the second adhesive is 50um, 75um, 100um or 125um, and the thickness of the third adhesive is 150um, 175um, 200um, 250um or 300um.

[0014] Furthermore, the liquid crystal display module is a TFT liquid crystal display module, an IPS liquid crystal display module or a flexible OLED display.

[0015] Furthermore, the cover plate is made of glass, PC, PMMA or PET.

[0016] Furthermore, the cover plate is a two-layer composite plate or a three-layer composite plate formed by copolymerization of PC and PMMA.

[0017] Furthermore, the cover plate is an IML formed by injection molding of PC and PMMA.

[0018] The beneficial effects of the present invention are:

[0019] The present invention transfers half of the number of wiring in the signal area of the capacitor sensing layer and the capacitor driving layer to the back side of the capacitor sensing layer and the capacitor driving layer respectively through through holes. Silver paste is printed on the side walls of the through holes to pass through the front and back sides of the capacitor sensing layer and the capacitor driving layer, which is equivalent to reducing the width of the signal area of the capacitor sensing layer and the capacitor driving layer by half, thereby reducing the width of the entire frame, making the frame narrower and the screen-to-body ratio higher.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the description, the following preferred embodiments of the present invention are described in detail with reference to the accompanying drawings. The specific implementation methods of the present invention are given in detail by the following embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a conventional touch display screen in the prior art;

[0022] Figure 2 for Figure 1 Schematic diagram of the signal area width structure of the mid-capacitance sensing layer;

[0023] Figure 3 for Figure 1 Schematic diagram of the signal area width structure of the mid-capacitor driving layer;

[0024] Figure 4 for Figure 1 Schematic diagram of the frame structure of the middle capacitance sensing layer;

[0025] Figure 5 for Figure 1 Schematic diagram of the frame structure of the capacitor drive layer;

[0026] Figure 6 It is a structural schematic diagram of the present invention;

[0027] Figure 7 for Figure 6 A schematic diagram of the width structure of the first capacitive sensing layer signal area and the second capacitive sensing layer signal area;

[0028] Figure 8 for Figure 6 Schematic diagram of the first through-hole structure of the middle capacitor sensing layer film;

[0029] Figure 9 for Figure 6 Schematic diagram of the width structure of the first capacitor driving layer signal area and the second capacitor driving layer signal area;

[0030] Figure 10 for Figure 6 Schematic diagram of the second through hole structure of the middle capacitor driving layer film;

[0031] Figure 11 for Figure 6 Schematic diagram of the frame structure of the middle capacitance sensing layer;

[0032] Figure 12 for Figure 6 Schematic diagram of the frame structure of the mid-capacitor drive layer.

[0033] Description of the numbers in the figure:

[0034] 1. Cover plate, 2. First adhesive, 3. First capacitor sensing layer signal area, 4. Capacitor sensing layer film, 5. Second adhesive, 6. First capacitor drive layer signal area, 7. Capacitor drive layer film, 8. Third adhesive, 9. Liquid crystal display module, 10. Second capacitor sensing layer signal area, 11. Second capacitor drive layer signal area, 12. Capacitor sensing layer, 13. Capacitor drive layer. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] See also Figure 6 As shown, a novel narrow-frame touch display screen includes a cover plate 1, a capacitive sensing layer 12, a capacitive driving layer 13, and a liquid crystal display module 9, which are arranged in order from top to bottom; a first adhesive 2 is provided between the cover plate 1 and the capacitive sensing layer 12, a second adhesive 5 is provided between the capacitive sensing layer 12 and the capacitive driving layer 13, and a third adhesive 8 is provided between the capacitive driving layer 13 and the liquid crystal display module 9; the capacitive sensing layer 12 includes a first capacitive sensing layer signal area 3, a second capacitive sensing layer signal area 10, and a capacitive sensing layer film 4 provided between the first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10, which mainly serves to receive signals; the capacitive driving layer 13 includes a first capacitive driving layer signal area 6, a second capacitive driving layer signal area 11, and a capacitive driving layer film 7 provided between the first capacitive driving layer signal area 6 and the second capacitive driving layer signal area 11, which mainly serves to transmit signals.

[0037] Furthermore, the capacitive sensing layer film 4 is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as the base material and ITO as the transparent conductive material, and the capacitive sensing pattern is obtained in its surface by exposure, development and etching.

[0038] Furthermore, the capacitor driving layer film 7 is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as the base material and ITO as the transparent conductive material, and the capacitor driving pattern is obtained in its surface through exposure, development and etching.

[0039] Furthermore, the first adhesive 2, the second adhesive 5 and the third adhesive 8 are solid optically transparent adhesives, liquid silicone water-based adhesives or acrylic water-based adhesives, which have high transmittance and great viscosity. The thickness of the first adhesive 2 is 50um, 75um, 100um or 125um, with 100um and 125um commonly used. The thickness of the second adhesive 5 is 50um, 75um, 100um or 125um, with 50um commonly used. The thickness of the third adhesive 8 is 150um, 175um, 200um, 250um or 300um.

[0040] Furthermore, the liquid crystal display module 9 is a TFT liquid crystal display module, an IPS liquid crystal display module or a flexible OLED display.

[0041] Furthermore, the cover plate 1 is made of glass, PC, PMMA, PET, or a two-layer composite plate or three-layer composite plate made of a copolymer of PC and PMMA, or an IML formed by injection molding of PC and PMMA. It can be a flat 2D cover plate, or a 2.5D or 3D cover plate.

[0042] The capacitance sensing layer film 4 has a first through hole in the edge wiring area by laser or punching, and the first capacitance sensing layer signal area 3 and the second capacitance sensing layer signal area 10 are connected through the first through hole. Figure 8 When the silver paste is printed, part of the silver paste will pass through the sidewall to connect the first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10, forming a complete wiring line.

[0043] The first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10 are both printed with silver paste traces on the edge of the capacitive sensing layer film 4. The signal area is between the ground line and the outermost edge of the capacitive sensing pattern of the capacitive sensing layer film 4, forming a signal conduction. The conventional trace width and line spacing of the general signal area is 30um / 30um. Taking a 15-inch touch screen as an example, the capacitive sensing layer 12 has 40 traces, the first capacitive sensing layer signal area 3 has 20 traces, and the signal area width is 1.2mm. The second capacitive sensing layer signal area 10 has 20 traces, and the signal area width is 1.2mm. The signal area of the capacitive sensing layer film 4 is laser punched or punched. The first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10 are respectively located on the front and back of the capacitive sensing layer film 4. The first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10 are cross-overlapped, and the first and second traces of the first capacitive sensing layer signal area 3 on the front of the capacitive sensing layer film 4 are inserted between the capacitive sensing layer film 4. The 21st trace of the second capacitive sensing layer signal area 10 on the back side, the 22nd trace of the second capacitive sensing layer signal area 10 on the back side of the capacitive sensing layer film 4 is inserted between the 2nd and 3rd traces of the first capacitive sensing layer signal area 3 on the front side of the capacitive sensing layer film 4, and so on, until the 39th trace of the second capacitive sensing layer signal area 10 on the back side of the capacitive sensing layer film 4 is inserted between the 19th and 20th traces of the first capacitive sensing layer signal area 3 on the front side of the capacitive sensing layer film 4, and the 40th trace of the second capacitive sensing layer signal area 10 on the back side of the capacitive sensing layer film 4 is located to the right of the 39th trace, thereby achieving perfect overlap between the first capacitive sensing layer signal area 3 and the second capacitive sensing layer signal area 10, thereby reducing the width of the signal area from 2.4 mm to 1.23 mm. The structural diagram is shown in FIG. Figure 7 shown.

[0044] The capacitor driving layer film 7 has a second through hole in the edge wiring area by laser or punching, and the first capacitor driving layer signal area 6 and the second capacitor driving layer signal area 11 are connected through the second through hole. Figure 10 When the silver paste is printed, part of the silver paste will pass through the sidewall to connect the first capacitor driving layer signal area 6 and the second capacitor driving layer signal area 11, forming a complete wiring line.

[0045] Taking a 15-inch touch screen as an example, according to the 16:9 size of the AA area of the liquid crystal display module, the first capacitor drive layer signal area 6 and the second capacitor drive layer signal area 11 are both printed with silver paste traces on the edge of the capacitor drive layer film 7. The signal area is between the ground line and the outermost edge of the capacitor drive pattern of the capacitor drive layer film 7, forming signal conduction. The conventional line width and line spacing of the general signal area is 30um / 30um, the number of lines of the capacitor drive layer 13 is 70, the number of lines of the first capacitor drive layer signal area 6 is 35, the width of the signal area is 2.1mm, the number of lines of the second capacitor drive layer signal area 11 is 35, and the width of the signal area is 2.1mm. The signal area of the capacitor drive layer film 7 is laser punched or punched. The first capacitor drive layer signal area 6 and the second capacitor drive layer signal area 11 are respectively located on the front and back of the capacitor drive layer film 7. The first capacitor drive layer signal area 6 and the second capacitor drive layer signal area 11 are cross-overlapped. The first and second lines of the first capacitor drive layer signal area 6 on the front of the capacitor drive layer film 7 are inserted between the second capacitor drive layer signal area 6 on the back of the capacitor drive layer film 7. The 36th trace of the capacitor driving layer signal area 11 is inserted between the 2nd and 3rd traces of the first capacitor driving layer signal area 6 on the front side of the capacitor driving layer film 7, and the 37th trace of the second capacitor driving layer signal area 11 on the back side of the capacitor driving layer film 7 is inserted between the 34th and 35th traces of the first capacitor driving layer signal area 6 on the front side of the capacitor driving layer film 7, and the 69th trace of the second capacitor driving layer signal area 11 on the back side of the capacitor driving layer film 7 is inserted between the 34th and 35th traces of the first capacitor driving layer signal area 6 on the front side of the capacitor driving layer film 7. The 70th trace of the second capacitor driving layer signal area 11 on the back side of the capacitor driving layer film 7 is located on the right side of the 69th trace, which can achieve perfect overlap between the first capacitor driving layer signal area 6 and the second capacitor driving layer signal area 11, so that the width of the signal area is halved from 4.2 mm to 2.13 mm. The structural schematic diagram is shown in FIG. Figure 9 shown.

[0046] The frame structure of the capacitance sensing layer 12 is as follows: Figure 11 As shown in the figure, for a touch screen of about 15 inches, silver paste is used as the conductive material for the edge routing. The line width and line spacing are generally 30um / 30um. When the number of routing lines in the signal area of the capacitive sensing layer is 40, the width of the signal area is 1.23mm. Add to that the ground line width of 0.3mm, the distance from the edge of the routing line to the edge of the sensor of 0.4mm, the distance from the edge of the sensor to the edge of the CG of 0.4mm, the ground line to the signal area of 0.1mm, the overlap width of the silver paste and ITO of 0.3mm, and the overlap distance to VA of 0.5mm, so the total border size is 3.23mm.

[0047] The frame structure of the capacitor driving layer 13 is as follows Figure 12As shown, for a 15-inch touchscreen display, silver paste is used as the conductive material for edge traces, with a typical line width and line spacing of 30µm / 30µm. Based on the 16:9 aspect ratio of the AA area of the LCD module, the capacitive drive layer has 70 traces, with a signal area width of 2.13mm. Add to this a 0.3mm ground line width, a 0.4mm distance from the trace edge to the sensor edge, a 0.4mm distance from the sensor edge to the CG edge, a 0.1mm distance from the ground line to the signal area, a 0.3mm overlap between the silver paste and the ITO, and a 0.5mm overlap distance to the VA, resulting in a total border size of 4.13mm.

[0048] Therefore, theoretical calculations show that the border size of the capacitive sensing layer is 3.23mm, and the border size of the capacitive drive layer is 4.13mm. Compared with the 4.2mm border size of the capacitive sensing layer and the 6.2mm border size of the capacitive drive layer of conventional touch screens, the border of the present invention can achieve the purpose of a narrow border by halving the width of the signal area.

[0049] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A novel narrow-border touch display screen, characterized by: The invention comprises a cover plate (1), a capacitance sensing layer (12), a capacitance driving layer (13) and a liquid crystal display module (9) which are sequentially arranged from top to bottom; a first adhesive (2) is arranged between the cover plate (1) and the capacitance sensing layer (12), a second adhesive (5) is arranged between the capacitance sensing layer (12) and the capacitance driving layer (13), and a third adhesive (8) is arranged between the capacitance driving layer (13) and the liquid crystal display module (9); the capacitance sensing layer (12) comprises a first capacitance sensing layer signal area (3), a second capacitance sensing layer signal area (10) and a capacitance sensing layer film (4) arranged between the first capacitance sensing layer signal area (3) and the second capacitance sensing layer signal area (10); the capacitance driving layer (13) comprising a first capacitor driving layer signal region (6), a second capacitor driving layer signal region (11) and a capacitor driving layer film (7) arranged between the first capacitor driving layer signal region (6) and the second capacitor driving layer signal region (11), wherein the capacitor sensing layer film (4) has a first through hole in the edge wiring region, and the first capacitor sensing layer signal region (3) and the second capacitor sensing layer signal region (10) are connected through the first through hole, and the capacitor driving layer film (7) has a second through hole in the edge wiring region, and the first capacitor driving layer signal region (6) and the second capacitor driving layer signal region (11) are connected through the second through hole; The first capacitive sensing layer signal area (3) and the second capacitive sensing layer signal area (10) are respectively printed with an equal number of traces in the edge trace area of the capacitive sensing layer film (4), the traces are arranged at intervals, and the traces of the first capacitive sensing layer signal area (3) and the traces of the second capacitive sensing layer signal area (10) do not overlap in their projections on the capacitive sensing layer film (4); The first capacitor drive layer signal area (6) and the second capacitor drive layer signal area (11) are respectively printed with an equal number of traces in the edge trace area of the capacitor drive layer film (7), the traces are arranged at intervals, and the traces of the first capacitor drive layer signal area (6) and the traces of the second capacitor drive layer signal area (11) do not overlap in their projections on the capacitor drive layer film (7).

2. The novel narrow-border touch display according to claim 1, characterized in that: The capacitive sensing layer film (4) is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as a base material and ITO as a transparent conductive material, and a capacitive sensing pattern is obtained in the surface of the film by exposure, development and etching.

3. The novel narrow-border touch display according to claim 2, characterized in that: The capacitor driving layer film (7) is a conductive film with PET, SRF, COP, PC or PI transparent flexible material as a base material and ITO as a transparent conductive material, and a capacitor driving pattern is obtained in the surface of the film by exposure, development and etching.

4. The novel narrow-border touch display according to claim 3, characterized in that: The first adhesive (2), the second adhesive (5) and the third adhesive (8) are solid optically transparent adhesive, liquid silicone water-based adhesive or acrylic water-based adhesive. The thickness of the first adhesive (2) is 50um, 75um, 100um or 125um, the thickness of the second adhesive (5) is 50um, 75um, 100um or 125um, and the thickness of the third adhesive (8) is 150um, 175um, 200um, 250um or 300um.

5. The novel narrow-border touch display according to claim 4, characterized in that: The liquid crystal display module (9) is a TFT liquid crystal display module, an IPS liquid crystal display module or a flexible OLED display.

6. The novel narrow-border touch display according to claim 5, characterized in that: The cover plate (1) is made of glass, PC, PMMA or PET.

7. The novel narrow-border touch display according to claim 5, characterized in that: The cover plate (1) is a two-layer composite plate or a three-layer composite plate formed by copolymerization of PC and PMMA.

8. The novel narrow-border touch display according to claim 5, characterized in that: The cover plate (1) is an IML formed by injection molding of PC and PMMA.

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