Resistive touch screen

Abstract

The resistive touch screen comprises a substrate, an ITO (indium tin oxide) layer, a plurality of first metal wire segments, four second metal wires and a plurality of compensation blocks. The compensation blocks penetrate through the ITO layer, are located on the inner side of the first metal wire and are located in the non-visual area. The plurality of compensation blocks are arranged so that the electric field distribution of the visible area is more uniform than the electric field distribution of the visible area when the plurality of compensation blocks are not arranged. The plurality of compensation blocks penetrate through the ITO layer to form the insulation area, and the insulation area has a relatively strong hindering effect on an electric field, so that the intensity of the surrounding electric field can be reduced. In addition, the plurality of first metal wire segments arranged around the visible area provide additional electric field control, and the distribution of the electric field is ensured to be more uniform. Besides, the plurality of first metal wire segments arranged around the visible area can cooperate with the compensation blocks, so that the uniformity of the electric field at the inner edge and corner positions of the visible area is improved, and the electric field distribution of the whole ITO layer is more balanced.

Description

Technical Field

[0001] The present disclosure relates to the field of visual display technology, and in particular, to a resistive touch screen. Background Art

[0002] With the continuous advancement of technology, the continuous development of touch screens has brought tremendous changes to our lives. Touch screens can not only improve user experience, but also make the interaction between people and technology more natural, promoting the advent of the intelligent era.

[0003] Resistive touch screens have the advantages of low price, high reliability, strong compatibility and high precision, and are particularly popular in industries such as industry, medical care and retail.

[0004] However, when using a rectangular resistive touch screen, it is often found that the touch accuracy at the edges or corners is poor, which seriously affects the user experience. Utility Model Content

[0005] In view of this, the present invention provides a resistive touch screen, aiming to solve the problem of poor touch accuracy at the edges or corners of traditional resistive touch screens.

[0006] The resistive touch screen provided by the present disclosure includes an ITO layer, a plurality of first metal wire segments, four second metal wires and a plurality of compensation blocks. The ITO layer includes a visible area and a non-visible area. The plurality of first metal wire segments are located in the non-visible area and are arranged around the visible area. Four second metal wires, the four second metal wires are located outside the plurality of first metal wire segments, one end of each of the four second metal wires is electrically connected to the ITO layer at a right angle to the ITO layer, and the other end of the second metal wire is connected to the outside of the resistive touch screen. A plurality of compensation blocks are arranged through the ITO layer, located inside the first metal wire and in the non-visible area. The plurality of compensation blocks are arranged so that the electric field distribution in the visible area is more uniform than the electric field distribution in the visible area when the plurality of compensation blocks are not arranged.

[0007] Since multiple compensation blocks pass through the ITO layer to form an insulating area, the insulating area has a strong obstructive effect on the electric field, which helps to reduce the intensity of the surrounding electric field. Compared with the traditional method of compensating the edge electric field only through the first metal wire, the addition of the compensation block is not only fast and effective, but also improves the area ratio of the visible area to the non-visible area, and reduces the process difficulty and cost. Moreover, the multiple first metal wire segments arranged around the visible area provide additional electric field control, ensuring a more uniform distribution of the electric field and reducing the concentration or unevenness of the electric field strength. In addition, the multiple first metal wire segments arranged around the visible area can work synergistically with the compensation blocks, which not only improves the uniformity of the electric field at the edges and corners of the visible area, but also helps to make the electric field distribution of the entire ITO layer more balanced. This uniform electric field distribution allows users to obtain feedback more sensitively and accurately during operation, thereby helping to improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] It should be understood that the following drawings only depict certain embodiments of the present disclosure and should not be considered limiting of the scope.

[0009] It should be understood that the same or similar reference numerals are used in the drawings to identify the same or similar elements.

[0010] It should be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0011] Figure 1 A schematic structural diagram of a resistive touch screen provided in one embodiment of the present disclosure.

[0012] Figure 2 for Figure 1 Schematic diagram of the structure of the ITO layer in .

[0013] Figures 3a to 3d for Figure 2 A partial enlarged view of .

[0014] Figure 4 A schematic structural diagram of a resistive touch screen provided in an embodiment of the present disclosure.

[0015] Figure 5 for Figure 4 Schematic diagram of the structure of the first ITO layer in .

[0016] Figure 6 for Figure 4 Schematic diagram of the structure of the second ITO layer in . DETAILED DESCRIPTION

[0017] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in many ways and should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present disclosure.

[0018] Resistive touch screens typically consist of two spaced-apart ITO layers (or ITO glass). When an object applies pressure to the touch screen, such as when drawing a line or writing with a single point, the two ITO layers (or ITO glass) come into contact, allowing current to flow between the two layers of ITO glass, causing a change in resistance. Because the resistance at the pressed location decreases significantly, while the resistance at other unpressurized points remains high, the coordinates of the touched point can be calculated by measuring the change in resistance and the corresponding current. However, touch accuracy at the edges or corners of the touch screen is found to be poor, seriously affecting the user experience.

[0019] Analysis shows that the edge effect often causes the electric field to be stronger at the edge or corner of the viewing area, resulting in uneven local electric field distribution and poor touch accuracy at the edge or corner.

[0020] In view of this, an embodiment of the present disclosure provides a resistive touch screen 100. Compared with traditional resistive touch screens, the resistive touch screen 100 improves the accuracy of touch at edges and corners by compensating for the electric field at edges or corners, allowing users to obtain more sensitive and accurate feedback, thereby greatly improving the user experience.

[0021] For ease of understanding, the overall structure of the resistive touch screen 100 is first described below. It should be understood that the overall structure of the resistive touch screen 100 is not limited to the following description. For example, one or more of the elements described below may be omitted or replaced, and their layout relationships may be interchangeable.

[0022] It should be noted that, in this disclosure, the length direction may refer to a direction orthogonal to the width and height directions. In the drawings of this disclosure, the arrow X+ may be used to indicate the right side in the length direction, and the arrow X- may be used to indicate the left side in the length direction. The arrow Y+ may be used to indicate one side in the width direction, and the arrow Y- may be used to indicate the other side in the width direction. The arrow Z+ may be used to indicate the upward direction in the height direction, and the arrow Z- may be used to indicate the downward direction in the height direction.

[0023] Example 1

[0024] refer to Figure 1The resistive touch screen 100 may include two spaced-apart ITO layers, which may be disposed on a glass substrate or a PET substrate, such as a first ITO layer 50 and a second ITO layer 60. Each ITO layer may include a visible area 10 and a non-visible area 20, with the non-visible area 20 surrounding the visible area 10. It will be appreciated that the ITO layer may be disposed on a substrate or may be an ITO glass.

[0025] Combine Figure 1 and Figure 2 The resistive touch screen 100 may further include a plurality of first metal segments 51 located in the non-visible area and arranged around the visible area. The plurality of first metal segments 51 are arranged along the side length of the ITO, and may include, for example, a first metal segment 511, a first metal segment 512, a first metal segment 513, and a first metal segment 514. The first metal segment 511 and the first metal segment 512 are arranged in parallel, and the first metal segment 513 and the first metal segment 514 are arranged in parallel.

[0026] refer to Figure 2 The resistive touch screen 100 may also include four second metal wires 52 (respectively: 521, 522, 523, and 524). The four second metal wires 52 are located outside the plurality of first metal wire segments 51. One end of each of the four second metal wires 52 is electrically connected to the ITO layer at a right angle to the ITO layer, and the other end of the second metal wire is connected to the outside of the resistive touch screen, thereby enabling external signal transmission. For example, the second metal wires 52 extend away from the first visual area to form four interfaces A, B, C, and D for connecting to an external FPC, which can provide power to the ITO layer and transmit drive signals or control signals. It should be understood that the four interfaces can be located anywhere on a side of the ITO layer or on multiple sides.

[0027] Continue to refer Figure 2 The resistive touch screen 100 may further include a plurality of compensation blocks 62 disposed throughout the ITO layer. The plurality of compensation blocks 62 are located inside the plurality of first metal wire segments 51 and in the non-visible area, and are configured to make the electric field distribution in the visible area more uniform than when the plurality of compensation blocks are not disposed.

[0028] Since multiple compensation blocks pass through the ITO layer to form an insulating area, the insulating area has a strong obstructive effect on the electric field, which helps to reduce the intensity of the surrounding electric field. Compared with the traditional solution of compensating the edge electric field only through the first metal wire segment, the addition of the compensation block is not only fast and effective, but also improves the area ratio of the visible area to the non-visible area, and reduces the process difficulty and cost. In addition, the multiple first metal wire segments set around the visible area provide additional electric field control, ensuring a more uniform distribution of the electric field and reducing the concentration or unevenness of the electric field strength. In addition, the multiple first metal wire segments set around the visible area can work synergistically with the compensation blocks, which not only improves the uniformity of the electric field at the edges and corners of the visible area, but also helps to make the electric field distribution of the entire ITO layer more balanced. This uniform electric field distribution allows users to obtain feedback more sensitively and accurately during operation, thereby helping to improve the user experience.

[0029] It is understood that the aforementioned ITO layer, first metal line, multiple compensation blocks, and second metal line can all be located on the first ITO layer 50. The first ITO layer 50 can be located on the first substrate, while the second ITO layer is located on the second substrate, and no other metal lines are provided on the second ITO layer. Of course, the first substrate and the second substrate can also be interchanged.

[0030] Continue to refer Figure 2 Among the at least two compensation blocks disposed inside the same metal edge of the first metal line in the plurality of compensation blocks 62, the area of ​​the orthographic projection of the compensation block near the center of the visible area on the ITO is smaller than the area of ​​the orthographic projection of the compensation block far from the center of the visible area on the ITO. For example, Figure 2 Compensation blocks 621 and 622 are located inside first metal line 511. Compensation block 621 is further away from the center of the second visible area than compensation block 622, and the orthographic projection area S1 of compensation block 621 is significantly larger than the orthographic projection area S2 of compensation block 622. The other compensation blocks inside first metal line 511, the compensation blocks inside first metal line 512, the compensation blocks inside first metal line 513, and the compensation blocks inside first metal line 514 have the same layout and are not further described here.

[0031] The larger the compensation block, the greater its ability to weaken the electric field, and the greater its ability to compensate for the electric field at the edges or corners. This helps further reduce the difference in electric field strength at the edges or corners and the center, creating a more uniform electric field distribution at the edges, corners, and center of the viewing area. This helps improve visual sensitivity and accuracy at the edges or corners, reduces the negative impact of edge effects, and further enhances the user experience.

[0032] It should be noted that the shape of the compensation block 62 is not specifically limited, as long as it conforms to the trend of area change. For example, the compensation block can be a triangle, a trapezoid, or a pentagon that combines a triangle and a rectangle. Of course, the compensation block can also be any other regular or irregular polygon.

[0033] Preferably, the longer the side length of the compensation block 62 close to the first metal wire segment, the smaller the area of ​​the side away from the first metal wire segment for the compensation block of the same area. This helps to further reduce the area of ​​the non-visible area and increase the relative area of ​​the visible area. Moreover, the larger the area ratio of the visible area to the non-visible area, the more helpful it is to achieve a narrow frame.

[0034] The location of the compensation blocks can be flexibly designed based on the distribution of the electric field. Of course, multiple compensation blocks can be placed only at the edges or corners, while fewer or no compensation blocks can be placed near the center of the viewing area. For example, compensation blocks can be placed at four right angles to the viewing area. The number of compensation blocks can be 4N, which helps improve the uniformity of the electric field in every corner.

[0035] Continue to refer Figure 2 The compensation blocks 62 located inside any two opposing metal edges of the first metal line are symmetrically arranged. For example, the compensation blocks 62 located inside the upper first metal line 511 and the compensation blocks 62 located inside the lower first metal line 513 are symmetrically distributed about the center line L2; and the compensation blocks 62 located inside the left first metal line 512 and the compensation blocks 62 located inside the right first metal line 514 are symmetrically distributed about the center line L1. This layout helps improve the uniformity of the electric field in both the length and width directions.

[0036] Continue to refer Figure 2 , multiple compensation blocks located inside the same metal edge of the first metal line are symmetrically distributed. As an example, the multiple compensation blocks 62 located inside the upper first metal line 511 are symmetrically distributed about the center line L1; the multiple compensation blocks 62 located inside the lower first metal line 513 are symmetrically distributed about the center line L1; the multiple compensation blocks 62 located inside the left first metal line 512 are symmetrically distributed about the center line L2; and the multiple compensation blocks 62 located inside the right first metal line 514 are symmetrically distributed about the center line L2. In this way, the symmetrical compensation block layout not only helps to improve the uniformity of the electric field distribution and reduce the concentration of the electric field, but also reduces the difficulty of designing and processing the ITO layer, and helps to avoid the risk of uneven resistance of the entire ITO layer.

[0037] Combine Figures 3a to 3d, the multiple first metal wire segments 51 include multiple fold line segments 21 and multiple line segments 22 arranged in a stacked manner to balance the electric field distribution at the edge or corner positions. Since the fold line segments can optimize the flow path of the current, the current can be quickly and more effectively distributed at the edge and corner positions, thereby compensating for the resistance at the edge or corner position and optimizing the electric field distribution at the edge or corner to a greater extent. The line segments can optimize the electric field distribution to a lesser extent than the fold line segments. According to the distribution of the electric field at different positions of the ITO layer, selecting a combination of multiple fold line segments 21 and multiple line segments 22 arranged in a stacked manner helps to compensate the electric field in different regions to improve the electric field uniformity of the entire ITO layer.

[0038] return Figure 2 The impedance difference between the four first metal segments 51 disposed on the ITO layer 50 is ±2.5Ω to ensure uniformity of the electric field at the edges or corners of the touch area. The material of the first metal segments is not limited; for example, silver wire can quickly compensate for the electric field at the edges or corners, thereby improving touch accuracy.

[0039] Continue to refer Figure 2 The multiple folded line segments and line segments within any two relatively parallel edges of the ITO layer within the four first metal segments are symmetrically arranged. For example, the structure and shape of first metal segment 511 are axially symmetrical with the structure and shape of first metal segment 513. The structure and shape of first metal segment 512 are axially symmetrical with the structure and shape of first metal segment 514. This layout helps improve the uniformity of the electric field in both the length and width directions.

[0040] Combine Figures 3a to 3d , the first metal wire segments 51 on the inner side of the second metal wire 52 on the same side of the first metal wire segment 51 are symmetrically distributed about the center line of the second metal edge 52. Specifically, refer to Figure 3a , the first metal line segment 511 located inside the second metal line 521 and the second metal line 524 is symmetrically distributed about the center line L1; Figure 3c , the first metal line segment 513 located inside the second metal line 522 and the second metal line 524 below is symmetrically distributed about the center line L1; Figure 3b The first metal line segment 512, located inside the second metal line 521 on the left, is symmetrically distributed about the center line L2. Similar to the first metal line segment 514 on the left, located inside the second metal line 523 on the right, it is also symmetrically distributed about the center line L2. This symmetrical metal line layout not only helps improve the uniformity of the resistance distribution, but also helps reduce the design and processing difficulty of the first substrate and the risk of uneven electric field on the first substrate. Below, the structure and layout of the first metal line segment 511 are described in detail, taking the first metal line segment 511 as an example.

[0041] refer to Figure 3a and Figure 3d The first metal line segments located on the same edge of the ITO layer include multiple symmetrically arranged folded line segments and multiple line segments. It can be understood that the combination of multiple folded line segments and multiple line segments can also be understood as a combination of multiple hollowed-out line segments and line segments of varying thickness. This allows for a reasonable layout based on the degree of electric field distortion at edges or corners, thereby further improving electric field uniformity.

[0042] refer to Figure 3a , taking the first metal wire segment 511 as an example, the first metal wire segment 511 includes a combination of 12 groups of line segments and broken line segments, of which the 6 groups A1-A6 on the left and the 6 groups A7-A12 on the right are symmetrically distributed, that is, the structures of A1 and A12 are the same. Figure 3d A1 and A2 on the far left (farthest from the center of the touch area) include two fold line segments a11 and a12, a line segment a13 and a hollow area a14. A3, A4 and A5 in the middle include a fold line segment a41, a line segment a42 and a hollow area a43 respectively, and the three groups have the same length and structure. A6 closest to the center of the touch area includes two fold line segments a61 and a62, a line segment a63 and a larger hollow area a64.

[0043] For the center of the touch area, the uniformity of the electric field is relatively optimal, so there is no need to set too many metal wires for compensation; for the edge or corner positions of the touch area, the uniformity of the electric field is the worst, so it is necessary to compensate through the combination of metal wires and larger compensation blocks, which can achieve faster and better compensation of the electric field in this area (of course, compensation can also be achieved by setting more complex metal wires, but the area of ​​the non-visible area will increase, thereby reducing the area of ​​the visible area); for other positions, the electric field in this area can be compensated through the combination of metal wires and smaller compensation blocks.

[0044] In this way, the uniformity of the ITO layer's electric field is achieved by combining different metal lines and compensation blocks in different areas, achieving regional electric field compensation. This helps improve the overall electric field uniformity of the ITO layer, thereby enhancing touch accuracy and sensitivity. Furthermore, the combination of compensation blocks and metal lines helps increase the area ratio of the visible to non-visible areas, thereby achieving a narrow bezel.

[0045] refer to Figures 3a to 3dThe upper second metal line 521 and the upper second metal line 524 intersect the first metal line segment 511, and the intersecting first and second metal lines are located away from the center of the first visual area 51. Similarly, the lower second metal line also intersects the first metal line segment at a right angle to the ITO layer. This allows for faster and better electrical signal transmission between the ITO layer and the outside world, thereby improving touch sensitivity and accuracy.

[0046] It should be noted that by setting the impedance difference between the four second metal lines within ±1Ω, the voltage loss of each potential applied to each second metal line is ensured to be equal and the voltage value applied to the second metal line is consistent with the expected value, thereby helping to improve the uniformity of the electric field distribution. The second metal lines can have a variety of shapes and distributions. For example, the second metal lines 521 and the second metal lines 522 can use metal lines of different thicknesses. In this way, the length of the second metal lines can be better controlled, thereby facilitating the increase of the visible area and facilitating the realization of a narrow bezel.

[0047] Example 2

[0048] refer to Figure 2 and Figure 4 The resistive touch screen 200 has a similar structure and layout to the resistive touch screen 100 described above. The differences are that multiple first metal lines and second metal lines are located on the first ITO layer 70, multiple compensation blocks are located on the second ITO layer 80, and the first ITO layer and the second ITO layer are positioned opposite each other. The first ITO layer 70 can be located on the first substrate, and the second ITO layer 80 can be located on the second substrate. Of course, the first and second substrates can also be interchanged. Of course, either ITO layer can also be ITO glass.

[0049] refer to Figure 6 and Figure 5 The structure and distribution of the multiple compensation blocks 82 are similar to the structure and distribution of the multiple compensation blocks 62 in Example 1, and the structure and distribution of the multiple first metal wire segments 71 and the four second metal wires 72 are similar to the structure and distribution of the multiple first metal wire segments 51 and the four second metal wires 72 in Example 1, which will not be repeated here.

[0050] By introducing the compensation block, compared with the traditional technical solution of compensating the edge electric field only through the first metal wire, it is not only fast and effective, but also improves the area ratio of the visible area to the non-visible area, and reduces the process difficulty and cost. Moreover, the multiple first metal wire segments arranged around the visible area provide additional electric field control, ensuring a more uniform distribution of the electric field and reducing the concentration or unevenness of the electric field strength. In addition, the multiple first metal wire segments arranged around the visible area and the compensation block can work synergistically, which not only improves the uniformity of the electric field at the edges and corners of the visible area, but also helps to make the electric field distribution of the entire ITO layer more balanced. This uniform electric field distribution allows users to obtain feedback more sensitively and accurately during operation, thereby helping to improve the user experience.

[0051] It is understood that in the present disclosure, directional descriptions such as "upper," "lower," "inner," and "outer" are relative rather than absolute. These directional terms may be applicable when the present disclosure provides a resistive touch screen positioned in the posture and position shown in the accompanying drawings.

[0052] It should be understood that although the terms "first" or "second" etc. may be used in the present disclosure to describe various elements (such as a first metal line and a second metal line), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0053] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0054] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0055] The components and devices involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the drawings. As will be appreciated by those skilled in the art, these components and devices may be connected, arranged, or configured in any manner.

[0056] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A resistive touch screen comprising a substrate, an ITO layer, a visible area and a non-visible area, characterized in that: The resistive touch screen also includes A plurality of first metal line segments are located in the non-visible area and are arranged around the visible area, Four second metal lines, the four second metal lines are located outside the plurality of first metal line segments, one end of each of the four second metal lines is electrically connected to the ITO layer at a right angle to the ITO layer, and the other end of the second metal line is connected to the outside of the resistive touch screen, A plurality of compensation blocks are provided through the ITO layer, are located inside the first metal line and are located in the non-visible area; wherein, The provision of the plurality of compensation blocks makes the electric field distribution in the viewing area more uniform than when the plurality of compensation blocks are not provided.

2. The resistive touch screen according to claim 1, wherein: The resistive touch screen further includes a first substrate, and the ITO layer, the first metal line, the plurality of compensation blocks, and the second metal line are located on the first substrate.

3. The resistive touch screen according to claim 1, wherein: The resistive touch screen further includes a first substrate and a second substrate provided with an ITO layer. The plurality of first metal lines and the second metal lines are located on the first substrate, and the plurality of compensation blocks are located on the second substrate.

4. The resistive touch screen according to claim 2 or 3, wherein: Among the at least two compensation blocks among the multiple compensation blocks that are located on the inner side of the same metal edge in the first metal wire, the area of ​​the orthographic projection of the compensation block close to the center of the visible area on the ITO is smaller than the area of ​​the orthographic projection of the compensation block far from the center of the visible area on the ITO.

5. The resistive touch screen according to claim 4, wherein: Among the plurality of compensation blocks, the plurality of compensation blocks located inside any two oppositely disposed metal edges of the first metal wire are symmetrically arranged.

6. The resistive touch screen according to claim 4, wherein: The compensation blocks located inside a same metal edge of the first metal line are symmetrically distributed.

7. The resistive touch screen according to claim 2 or 3, wherein: The plurality of first metal line segments include a plurality of fold line segments and a plurality of line segments stacked together.

8. The resistive touch screen according to claim 7, wherein: The multiple broken line segments and the multiple line segments in the first metal line that are located on the same side of the ITO layer are symmetrically arranged.

9. The resistive touch screen according to claim 7, wherein: The multiple broken line segments and the multiple line segments located at any two oppositely arranged sides of the ITO layer in the multiple first metal line segments are symmetrically arranged.

10. The resistive touch screen according to claim 1, wherein: At least one of the ITO layers is ITO glass.

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