Resistive touch screen
By setting multiple metal segments and compensation blocks in the resistive touch screen, the electric field distribution is optimized, and the problem of poor touch accuracy at the edge or corner positions of the traditional resistive touch screen is solved, achieving a more uniform electric field distribution and a higher user experience.
Patent Information
- Application Number
- CN202411347997.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2024-12-17
AI Technical Summary
The touch accuracy of traditional resistive touch screens at edges or corners is poor, which affects the user experience.
By setting a plurality of first metal segments and four second metal lines in the ITO layer, combining multiple compensation blocks, an insulating area is formed to reduce the electric field strength and optimize the electric field distribution, so that the electric field at the edges and corners of the visual area is more stable Even.
It improves the user's touch sensitivity and accuracy during operation, improves the user experience, and reduces process difficulty and cost.
Smart Images
Figure CN119148886A_ABST
Abstract
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 great 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 accuracy, and are very popular in fields such as industry, medical treatment 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. Summary of the invention
[0005] In view of this, the present invention provides a resistive touch screen, aiming to solve the problem of poor touch accuracy at the edge or corner of a traditional resistive touch screen.
[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, 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 film 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 throughout the ITO layer, are located inside the first metal wire and are located 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 penetrate 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 edge and corner positions within the visible area, but also helps to make the electric field distribution of the overall 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 illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.
[0009] It should be understood that the same or similar reference numerals are used in the drawings to indicate 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 diagram of the structure 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 FIG.
[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 by an embodiment of the present disclosure.
[0015] Figure 5 for Figure 4 Schematic diagram of the structure of the first ITO layer in FIG.
[0016] Figure 6 for Figure 4 Schematic diagram of the structure of the second ITO layer in FIG. 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 a variety of ways and should not be construed as being limited to the embodiments described herein, which are only for a more thorough and clear understanding of the present disclosure.
[0018] Resistive touch screens usually include two ITO layers (or ITO glass) spaced apart. 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 with each other, which allows current to flow between the two layers of ITO glass and changes the resistance. Since the resistance of the pressed position is significantly reduced, the resistance of other unpressed points remains at a high level. By measuring the change in resistance and the corresponding current, the coordinates of the touch point can be calculated. However, when using it, it is found that the touch accuracy at the edges or corners of the touch screen is poor, which seriously affects the user experience.
[0019] Through analysis, it can be seen that the edge effect often causes the intensity of the electric field to increase at the edge or corner of the visible area, resulting in uneven local electric field distribution, which leads to 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, which, compared with a traditional resistive touch screen, improves the accuracy of touch at edges and corners by compensating for the electric field at edges or corners, so that users can 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 by way of example. It should be understood that the overall structure of the resistive touch screen 100 should not be limited to the following description. For example, one or more of the elements described below may be omitted or replaced, and the layout relationships between them may be replaced with each other.
[0022] It should be noted that, in the present disclosure, the length direction may refer to a direction orthogonal to the width and height directions. In the drawings of the present disclosure, the arrow X+ may be used to indicate the right side of the length direction, and the arrow X- may be used to indicate the left side of the length direction. The arrow Y+ may be used to indicate one side of the width direction, and the arrow Y- may be used to indicate the other side of the width direction. The arrow Z+ may be used to indicate the top of the height direction, and the arrow Z- may be used to indicate the bottom of the height direction.
[0023] Embodiment 1
[0024] refer to Figure 1The resistive touch screen 100 may include two ITO layers spaced apart, and the ITO layers 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, and the non-visible area 20 is disposed around the visible area 10. It can be understood that the ITO layer may be disposed on a substrate or may be an ITO glass.
[0025] Combination 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, for example, may include 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 realizing mutual transmission of external signals. For example, the second metal wire 52 extends four interfaces A, B, C and D away from the first visual area, which are used to connect to an external FPC, which can power the ITO layer, transmit drive signals or control signals, etc. It should be understood that the four interfaces can be located at any position on one side of the ITO layer or on multiple sides respectively.
[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 penetrate 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 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 edge and corner positions in the visible area, but also helps to make the electric field distribution of the overall 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 can be understood that the above-mentioned ITO layer, the first metal line, the plurality of compensation blocks and the 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, and the second ITO layer is located on the second substrate, and no other metal lines are arranged on the second ITO layer. Of course, the first substrate and the second substrate can also be interchangeable.
[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 ITO is smaller than the area of the orthographic projection of the compensation block far from the center of the visible area on ITO. For example, Figure 2 The compensation block 621 and the compensation block 622 inside the first metal line 511 in the figure are located farther from the center of the second visual area than the compensation block 622, and the area S1 of the orthographic projection of the compensation block 621 is significantly larger than the area S2 of the orthographic projection of the compensation block 622. The other compensation blocks inside the first metal line 511, the compensation blocks inside the first metal line 512, the compensation blocks inside the first metal line 513, and the compensation blocks inside the first metal line 514 have the same layout, which will not be described in detail here.
[0031] The larger the area of the compensation block, the stronger the ability to weaken the electric field, and the stronger the ability to compensate for the electric field at the edge or corner. This is conducive to further reducing the difference between the electric field strength at the edge or corner position and the electric field strength at the center position, so that the edge, corner position and center position of the visible area form a more uniform electric field distribution, thereby helping to improve the visual sensitivity and accuracy of the edge or corner position, reduce the negative impact of the edge effect, and further improve 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 combining 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, for the compensation block of the same area, the smaller the area of the side far away from the first metal wire segment. 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 border.
[0034] The position of the compensation block can be flexibly designed according to the distribution of the electric field. Of course, multiple compensation blocks can be set only at the edge or corner position, and no compensation blocks or fewer compensation blocks can be set near the center of the visual area. For example, the compensation blocks can be separately located at four right angles in the visual area. The number of compensation blocks can be 4N, which helps to improve the uniformity of the electric field in each corner.
[0035] Continue to refer Figure 2 , the compensation blocks 62 located inside any two metal edges that are oppositely arranged in the first metal wire are symmetrically arranged. For example, the compensation blocks 62 located inside the upper first metal wire 511 and the compensation blocks 62 located inside the lower first metal wire 513 are symmetrically distributed about the center line L2; the compensation blocks 62 located inside the left first metal wire 512 and the compensation blocks 62 located inside the right first metal wire 514 are symmetrically distributed about the center line L1. This layout is conducive to improving the uniformity of the electric field in the length direction and the width direction.
[0036] Continue to refer Figure 2 , the multiple compensation blocks located inside the same metal edge in 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 first metal line 512 on the left are symmetrically distributed about the center line L2; the multiple compensation blocks 62 located inside the first metal line 514 on the right are symmetrically distributed about the center line L2. In this way, the symmetrical layout of the compensation blocks 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 is also helpful in avoiding the risk of uneven resistance of the entire ITO layer.
[0037] Combination Figures 3a to 3d, the plurality of first metal wire segments 51 include a plurality of folded line segments 21 and a plurality of line segments 22 arranged in a stacked manner to balance the electric field distribution at the edge or corner position. Since the folded 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 folded line segments. According to the distribution of the electric field at different positions of the ITO layer, selecting a combination of a plurality of folded line segments 21 and a plurality of 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 wire segments 51 arranged on the ITO layer 50 is ±2.5Ω to ensure the uniformity of the electric field at the edge or corner of the touch area. The material of the first metal wire segment is not specifically limited, for example, it can be a silver wire, which can quickly compensate for the electric field at the edge or corner, which is conducive to improving the accuracy of touch.
[0039] Continue to refer Figure 2 , the multiple broken line segments and multiple line segments located inside any two relatively parallel sides in the ITO layer of the four first metal line segments are symmetrically arranged. For example, the structure and shape of the first metal line segment 511 and the structure and shape of the first metal line segment 513 are symmetrically arranged. The structure and shape of the first metal line segment 512 and the structure and shape of the first metal line segment 514 are symmetrically arranged. This layout is conducive to improving the uniformity of the electric field in the length direction and the width direction.
[0040] Combination Figures 3a to 3d , the first metal wire segments 51 located inside the second metal wire 52 on the same side of the first metal wire segment 51 are symmetrically distributed about the center line axis 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 wire segment 512 located inside the second metal wire 521 on the left side is symmetrically distributed about the center line L2; similar to the one located on the left side, the first metal wire segment 514 located inside the second metal wire 523 on the right side is symmetrically distributed about the center line L2. In this way, the layout of symmetrical metal wires not only helps to improve the uniformity of resistance distribution, but also helps to reduce the design and processing difficulty of the first substrate, and also helps to reduce the risk of uneven electric field of the first substrate. Below, the structure and layout of the first metal wire segment 511 are described in detail as an example.
[0041] refer to Figure 3a and Figure 3d The first metal line segment disposed on the same side of the ITO layer includes a plurality of symmetrically disposed folded line segments and a plurality of line segments. It can be understood that the combination of a plurality of folded line segments and a plurality of line segments can also be understood as a plurality of hollowed-out and line segments of different thicknesses. In this way, a reasonable layout can be made according to the degree of distortion of the electric field at the edge or corner position, thereby better improving the uniformity of the electric field.
[0042] refer to Figure 3a , taking the first metal line segment 511 as an example, the first metal line segment 511 includes a combination of 12 groups of line segments and broken line segments, wherein 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, the middle A3, A4 and A5 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, and 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 up too many metal wires for compensation; for the edge or corner of the touch area, the uniformity of the electric field is the worst, so it is necessary to compensate through the coordination 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 up 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 coordination of metal wires and smaller compensation blocks.
[0044] In this way, the uniformity of the electric field of the ITO layer is achieved by using different metal wires and compensation blocks in different areas to achieve regional electric field compensation, which helps to improve the overall electric field uniformity of the ITO layer, thereby improving the accuracy and sensitivity of touch control. In addition, the coordination of compensation blocks and metal wires is also conducive to increasing the area ratio of the visible area to the non-visible area, thereby achieving a narrow frame.
[0045] refer to Figures 3a to 3d, the second metal line 521 located on the upper side and the second metal line 524 located on the upper side are arranged to intersect with the first metal line segment 511, and the intersecting first metal line and second metal line are located away from the center of the first visual area 51. Similarly, the second metal line located on the lower side is also arranged to intersect with the first metal line segment at a right angle to the ITO. In this way, the electrical signal transmitted between the ITO layer and the outside is faster and better, which helps to improve the sensitivity and accuracy of touch control.
[0046] It should be noted that by setting the impedance difference between the four second metal wires within ±1Ω, it is ensured that the voltage loss of the potential loaded to each second metal wire is equal and the voltage value loaded on the second metal wire is in line with expectations, which helps to improve the uniformity of the electric field distribution. The second metal wires can have a variety of shapes and distributions. For example, the second metal wire 521 and the second metal wire 522 can use metal wires of different thicknesses. In this way, the length of the second metal wire can be better controlled, which is beneficial to increase the area of the visible area, so as to help achieve a narrow frame.
[0047] Embodiment 2
[0048] refer to Figure 2 and Figure 4 The resistive touch screen 200 is similar in structure and layout to the resistive touch screen 100. The difference is that a plurality of first metal line segments and a second metal line are located in the first ITO layer 70, a plurality of compensation blocks are located in the second ITO layer 80, and the first ITO layer and the second ITO layer are arranged opposite to each other. The first ITO layer 70 can be located in the first substrate, and the second ITO layer 80 can be located in the second substrate. Of course, the first substrate and the second substrate can also be interchanged. Of course, any ITO layer can also be ITO glass.
[0049] refer to Figure 6 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 can work synergistically with the compensation block, which not only improves the uniformity of the electric field at the edge and corner positions within the visible area, but also facilitates a more balanced electric field distribution of the overall ITO layer. 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", "outer", etc. are relative rather than absolute. When the resistive touch screen provided by the present disclosure is placed in the posture and position shown in the accompanying drawings, these directional words may be applicable.
[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, and these terms are only used to distinguish one element from another.
[0053] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.
[0054] The above description has been given 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 multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, 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 protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A resistive touch screen, characterized in that: include Substrate, ITO layer, including visible area and non-visible area, 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 film 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 arranged through the ITO layer, located inside the first metal line and located in the non-visible area; wherein, The arrangement of the plurality of compensation blocks makes the electric field distribution in the visible area more uniform than when the plurality of compensation blocks are not arranged.
2. The resistive touch screen according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The compensation blocks located inside any two oppositely arranged metal edges of the first metal wire are symmetrically arranged.
6. The resistive touch screen according to claim 4, characterized in that: 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, characterized in that: The plurality of first metal line segments include a plurality of fold line segments and a plurality of line segments which are stacked.
8. The resistive touch screen according to claim 7, characterized in that: The multiple fold line segments and the multiple line segments in the first metal line which are located on the same side of the ITO layer are symmetrically arranged.
9. The resistive touch screen according to claim 7, characterized in that: The multiple broken line segments and the multiple line segments located at any two opposite sides of the ITO layer in the multiple first metal line segments are symmetrically arranged.
10. The resistive touch screen according to claim 1, characterized in that: At least one of the ITO layers is ITO glass.