Self-capacitive touch screen and touch display device having the same

Abstract

The present invention provides a self-capacitive touch screen, comprising a substrate, a plurality of electrode units, a plurality of first leads and a plurality of second leads, wherein the plurality of electrode units are arranged on the substrate and spaced apart in the circumferential direction, each electrode unit comprises an azimuth electrode group and a radius electrode group, any adjacent azimuth electrode groups have the same angle difference, and a radius electrode group is arranged between two adjacent azimuth electrode groups; the plurality of first leads and the plurality of second leads are used to electrically connect the azimuth electrode group and the radius electrodes of different radii to corresponding pads respectively; the plurality of electrode units, the first leads and the second leads are all arranged in the same conductive layer; wherein the coordinates of the touch point are obtained through the azimuth information of the azimuth electrode and the radius information of the radius electrode in the electrode unit. The present invention also provides a touch display device.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screens, and in particular to a self-capacitive touch screen and a touch display device having the self-capacitive touch screen. Background Art

[0002] With the development of touch screen technology, capacitive touch screens are increasingly used as human-machine interaction interfaces in electronic devices such as mobile phones and tablet computers. Traditional single-layer self-capacitive touch screens only require one layer of transparent conductive material, which is relatively low in cost.

[0003] See also Figure 1 For rectangular touch screens, a similar triangular electrode design can be used to achieve single-point touch. Each pair of triangular electrodes extends along the Y-axis (long side). In the X-axis (short side), the coordinate recognition is completed by multiple groups of different electrodes. The size of each group of electrodes in the X-axis (short side) direction is one PITCH (channel). Therefore, in the X-axis (short side) direction, multi-point touch can be truly recognized, while in the Y-axis (long side) direction, the touch coordinates are calculated by the ratio of the sensing amounts of two identical electrodes. Single-point touch or multi-point touch corresponds to the sensing ratio of the same group of electrodes, so the coordinates of multi-point touch in the same group cannot be distinguished. At the same time, please refer to Figures 2 to 4 , and can also design X-axis multi-touch and Y-axis two-touch solutions according to needs (see Figure 2 ), X-axis single-touch, Y-axis multi-touch solution (refer to Figure 3 ) and the X-axis two-point touch and Y-axis multi-point touch solutions (see Figure 4 )wait.

[0004] In addition, in recent years, with the gradual promotion of wearable products, the demand for touch solutions in special shapes, such as square, square with curved corners (quasi-square), and circle, has become increasingly strong. Various manufacturers have launched solutions such as GFF (mutual capacitance) and ON-CELL (mutual capacitance bridge). Single-layer self-capacitive solutions have also become a low-cost option.

[0005] See also Figures 5 to 7 For square, circular or quasi-circular touch screens, when using triangular electrode design, it cannot support real two-point touch, so a square array design is usually used. However, although the square array design can achieve real multi-point touch, if higher linearity and accuracy are required, the size of the square needs to be designed to be smaller, which easily leads to problems such as an increase in leads and an increase in the area of ​​the flexible printed circuit board (FPC), which is not conducive to the structural layout of wearable products.

[0006] See also Figure 7Taking a square touch screen with curved corners as an example, when a triangular electrode design is used, as the geometric size increases, the pattern symmetry is poor at the edge, and the touch accuracy and linearity are greatly reduced. For example, in the asymmetric areas of the edges of the square with curved corners, such as B1, B2, and B3 areas, when the geometric size increases, the asymmetry also increases, so the linearity and accuracy are greatly affected. Summary of the invention

[0007] In view of the above, it is necessary to provide a self-capacitive touch screen that can effectively achieve multi-touch with low cost and a touch display device having the self-capacitive touch screen.

[0008] In one aspect, the present invention provides a self-capacitive touch screen, comprising:

[0009] substrate;

[0010] A plurality of electrode units, the plurality of electrode units are disposed on the substrate and arranged at intervals along the circumferential direction, each electrode unit comprises an azimuth electrode group and a radius electrode group, any adjacent azimuth electrode groups have the same angle difference, and a radius electrode group is disposed between two adjacent azimuth electrode groups;

[0011] The azimuth electrode group includes one or a pair of azimuth electrodes, the one or a pair of azimuth electrodes extend along the radius of the circumference, and the radius electrode group includes at least two radius electrodes arranged along the radius direction of the circumference; and

[0012] a plurality of first leads, the plurality of first leads being used to electrically connect the azimuth electrode groups to corresponding pads respectively; and

[0013] A plurality of second leads, the plurality of second leads being used to electrically connect the radial electrodes of different radii to the corresponding pads respectively;

[0014] The plurality of electrode units, the first lead wire and the second lead wire are all disposed on the same conductive layer;

[0015] The coordinates of the touch point are obtained through the azimuth information of the azimuth electrode and the radius information of the radius electrode in the electrode unit.

[0016] Preferably, the extension lengths of the radial electrodes in the radial electrode group along the radial direction are equal.

[0017] Preferably, radial electrodes having the same radius are partially or completely connected together.

[0018] Preferably, the radius electrode arranged at the outermost periphery includes a pair of sub-radius electrodes, the pair of sub-radius electrodes are a complementary triangular pair or a polygonal pair, and the pair of sub-radius electrodes are driven by two different second leads.

[0019] Preferably, the radius electrode arranged at the outermost periphery includes a pair of sub-radius electrodes, which are complementary triangular pairs or polygonal pairs, one of the sub-radius electrodes is driven by a single second lead, the other sub-radius electrode is electrically connected to the adjacent sub-radius electrode in an adjacent pair of sub-radius electrodes, and are driven by a single second lead, and the other sub-radius electrode in the adjacent pair of sub-radius electrodes is driven by a single second lead.

[0020] Preferably, the first lead is led out from the outer periphery of the self-capacitive touch screen, and the second lead is led out from a gap between one of the radial electrode groups and an adjacent azimuth electrode group.

[0021] Preferably, the azimuth electrode group includes a pair of azimuth electrodes, the pair of azimuth electrodes are a complementary triangle pair or polygon pair, and the pair of azimuth electrodes are driven by two different first leads.

[0022] Preferably, the azimuth electrode group includes a pair of azimuth electrodes, which are complementary triangular pairs or polygonal pairs, one of the azimuth electrodes is driven by a single first lead, the other azimuth electrode is electrically connected to the adjacent azimuth electrodes in the adjacent azimuth electrode group and are driven by a single first lead, and the other azimuth electrode in the adjacent azimuth electrode group is driven by a single first lead.

[0023] Preferably, the self-capacitive touch screen also includes a center electrode. When the self-capacitive touch screen is circular or quasi-circular, the center electrode is arranged at the center of the self-capacitive touch screen, and a circle is drawn with the radius of the self-capacitive touch screen. The azimuth electrode group and the radius electrode group are arranged according to the center and the radius. The second lead is also used to electrically connect the center electrode to the corresponding pad.

[0024] Preferably, the self-capacitive touch screen also includes a center electrode. When the self-capacitive touch screen is square or a square with arc corners, a circle is drawn with the geometric center of the square as the center and half of the diagonal of the square as the radius. The azimuth electrode group and the radius electrode group are arranged according to the center and the radius. The center electrode is arranged at the geometric center of the self-capacitive touch screen. The second lead is also used to electrically connect the center electrode to the corresponding pad.

[0025] The present invention also provides a touch display device, comprising the self-capacitive touch screen, display screen, connecting wires and driving chip described above, wherein the self-capacitive touch screen is arranged on the display screen or integrated in the display screen and is electrically connected to the driving chip through the connecting wires.

[0026] Preferably, the touch display device is circular, quasi-circular, square or square with curved corners.

[0027] The self-capacitive touch screen of the present invention uses the simplest single-layer self-capacitive process, which can realize real multi-point detection, overcome the shortcomings of traditional self-capacitive that can only realize single-point touch or partitioned two-point touch, and greatly improve the touch performance. At the same time, the present invention is suitable for special-shaped touch screens such as round or square. Compared with the traditional small square electrodes, the number of bonding pads can be significantly reduced, thereby comprehensively improving the competitiveness of single-layer self-capacitive products in terms of performance, price, structural requirements, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figures 1 to 4 The diagram is a schematic diagram of a prior art method of using a triangular electrode design for a rectangular touch screen.

[0029] Figure 5 The diagram is a schematic diagram of a square array design for a circular or quasi-circular touch screen in the prior art.

[0030] Figure 6 It is a schematic diagram of a square array design for a square touch screen in the prior art.

[0031] Figure 7 The figure is a schematic diagram of a triangular electrode design for a square touch screen with curved corners in the prior art.

[0032] Figure 8 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a first preferred embodiment of the present invention.

[0033] Fig. 9 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a second preferred embodiment of the present invention.

[0034] Fig.10 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a third preferred embodiment of the present invention.

[0035] Fig.11a and Fig.11b FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a fourth preferred embodiment of the present invention.

[0036] Fig.12a and Figure 12b FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a fifth preferred embodiment of the present invention.

[0037] Fig.13 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a sixth preferred embodiment of the present invention.

[0038] Fig.14 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a seventh preferred embodiment of the present invention.

[0039] Fig.15 FIG. 4 is a schematic diagram of a self-capacitive touch screen according to an eighth preferred embodiment of the present invention.

[0040] Fig.16a and Fig.16b FIG. 4 is a schematic diagram of a self-capacitive touch screen according to a ninth preferred embodiment of the present invention.

[0041] Fig.17a FIG. 1 is a schematic diagram of a self-capacitive touch screen according to a tenth preferred embodiment of the present invention.

[0042] Fig.17b FIG. 1 is a schematic diagram of a self-capacitive touch screen according to an eleventh preferred embodiment of the present invention.

[0043] Fig.18 It is a wiring diagram of the self-capacitive touch screen in the present invention.

[0044] Main component symbols

[0045]

[0046] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that when an element is referred to as being "electrically connected" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "electrically connected" to another element, it may be a contact connection, for example, a wire connection, or a contactless connection, for example, a contactless coupling.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0051] See also Figure 8The first embodiment of the present invention provides a self-capacitive touch screen 100. The self-capacitive touch screen 100 includes a substrate 11, a center electrode R0 and a plurality of electrode units 13.

[0052] In this embodiment, the substrate 11 is circular or quasi-circular, that is, the self-capacitive touch screen 100 is a circular or quasi-circular touch screen. The plurality of electrode units 13 are all disposed on the same conductive layer of the substrate 11 .

[0053] In this embodiment, a circle is drawn with the radius of the self-capacitive touch screen 100, and the plurality of electrode units 13 are arranged according to the center and radius of the self-capacitive touch screen 100, and are spaced and insulated from each other. Specifically, the plurality of electrode units 13 are evenly arranged at a certain angle along the circumferential direction, and the plurality of electrode units 13 have the same spacing. The center electrode R0 is arranged at the center of the self-capacitive touch screen 100.

[0054] In the present embodiment, each electrode unit 13 includes an azimuth electrode group 131 and a radius electrode group 133. The azimuth electrode groups 131 and the radius electrode groups 133 in the plurality of electrode units 13 are alternately arranged in the circumferential direction. The spacing between the azimuth electrode groups 131 and the radius electrode groups 133 in each electrode unit 13 is the same. In the present embodiment, a radius electrode group 133 is arranged between every two adjacent azimuth electrode groups 131. And relative to the radius electrode group 133, the two adjacent azimuth electrode groups 131 are completely symmetrical. Similarly, an azimuth electrode group 131 is arranged between two adjacent radius electrode groups 133. And relative to the azimuth electrode group 131, the two adjacent radius electrode groups 133 are completely symmetrical.

[0055] For example, in this embodiment, the self-capacitive touch screen 100 includes eight electrode units 13. Therefore, the self-capacitive touch screen 100 includes eight azimuth electrode groups 131 and eight radius electrode groups 133. The eight azimuth electrode groups 131 and the eight radius electrode groups 133 are alternately arranged along the circumferential direction. The angle represented by each azimuth electrode group 131 is 45 degrees (i.e., 360° / 8=45°), that is, any adjacent azimuth electrode groups 131 have the same angle difference.

[0056] It can be understood that in this embodiment, the azimuth electrode group 131 includes an azimuth electrode 131a. That is, the number of azimuth electrodes in the azimuth electrode group 131 is one. Each azimuth electrode 131a is in a complete block shape, such as a strip, polygon, fan or other similar shape. The azimuth electrodes 131a in the multiple azimuth electrode groups 131 all extend along the radial direction of the circumference. In addition, the shape, size and structure of each azimuth electrode 131a are the same.

[0057] It can be understood that each radius electrode group 133 includes at least two radius electrodes arranged along the radial direction. The radius electrodes are in a complete block shape, such as a strip, polygon, fan or other similar shape. In this embodiment, each radius electrode group 133 includes two radius electrodes R1 and R2 arranged along the radial direction. In addition, the shape, size and structure of each radius electrode representing the same radius are the same.

[0058] It can be understood that in this embodiment, the azimuth electrode group 131 and the radius electrode group 133 are arranged in the same layer, that is, arranged on the same conductive layer. For example, a patterning process can be used to first form a whole layer of sensing electrode layer, and then the pattern of the azimuth electrode group 131 can be etched out by photolithography and other processes, and then the corresponding radius electrode group 133 can be formed in the same layer. The azimuth electrode group 131 and the radius electrode group 133 are arranged in the same layer to reduce the setting of the interlayer insulating layer, which is conducive to reducing the thickness of the self-capacitive touch screen 100.

[0059] It can be understood that the azimuth electrode 131a of the azimuth electrode group 131 in each electrode unit 13 and the radius electrodes R1 and R2 in the corresponding radius electrode group 133 are spaced and insulated from each other. At the same time, since each electrode unit 13 includes an azimuth electrode and multiple radius electrodes. Therefore, the coordinates of the corresponding touch point can be obtained based on the information of the above two electrodes. For example, the approximate position (i.e., azimuth information) of the touch point can be determined by the azimuth electrode 131a in the electrode unit 13, and then the coordinates of the corresponding touch point can be obtained based on the radius information of the radius electrodes R1 and R2 in the electrode unit 13 (such as the change in their self-capacitance).

[0060] It can be understood that in this embodiment, the extension lengths of the radial electrodes in the radial electrode group 133 along the radial direction are equal. For example, the extension length of the radial electrode R1 along the radial direction is equal to the extension length of the radial electrode R2 along the radial direction.

[0061] It can be understood that in this embodiment, the radius electrodes representing the same radius can be partially or fully connected internally. For example, in this embodiment, all radius electrodes R1 are partially or fully electrically connected internally. All radius electrodes R2 are partially or fully electrically connected internally and are insulated from the radius electrode R1.

[0062] It can be understood that since the radius electrodes R1 and R2 only include radius information, the radius electrodes representing the same radius and isolated by the azimuth electrode group 131 (i.e., the azimuth electrode 131a) can be fully or partially connected internally without external wiring, thereby greatly saving the number of bonding pads.

[0063] It can be understood that since the self-capacitive touch screen 100 is arranged with multiple azimuth electrode groups 131 along the circumferential direction. Therefore, the self-capacitive touch screen 100 supports real multi-point touch in this direction (i.e., the circumferential direction). The number of real touch points supported by the self-capacitive touch screen 100 is proportional to the number of radius electrodes in the radius or diameter direction. For example, in this embodiment, ignoring the center electrode R0, since each radius electrode group 133 in the self-capacitive touch screen 100 is evenly arranged with two radius electrodes R1 and R2 along its radius direction, the self-capacitive touch screen 100 supports real two-point touch along the radius direction and supports real four-point touch along the diameter direction.

[0064] It can be understood that since all electrodes, such as the azimuth electrode 131a and the radius electrodes R1 and R2, are in block form, it is convenient to wire the electrodes.

[0065] It can be understood that since the self-capacitive touch screen 100 is also provided with a center electrode R0 at its center position, touch detection can be conveniently performed on the center position of the self-capacitive touch screen 100, such as the center position, to effectively improve the test accuracy of the self-capacitive touch screen 100.

[0066] See also Fig. 9 The second embodiment of the present invention provides a self-capacitive touch screen 200. The self-capacitive touch screen 200 includes a center electrode R0 and a plurality of electrode units 23. Each electrode unit 23 includes an azimuth electrode group 231 and a radius electrode group 233. Each radius electrode group 233 includes two radius electrodes R1 and R2 arranged along the radial direction.

[0067] In this embodiment, the structure of the self-capacitive touch screen 200 is similar to that of the self-capacitive touch screen 100 in the first embodiment, except that the structure of the azimuth electrode group 231 in the self-capacitive touch screen 200 is different from that of the azimuth electrode group 131 in the first embodiment.

[0068] In the present embodiment, the azimuth electrode group 231 includes a pair of azimuth electrodes 231a and 231b (i.e., two azimuth electrodes). In the present embodiment, the shapes of the azimuth electrodes 231a and 231b in each azimuth electrode group 231 are both triangular, and the two are complementary. That is, the azimuth electrodes 231a and 231b are a complementary triangular pair. Of course, in other embodiments, the shapes of the azimuth electrodes 231a and 231b are not limited to triangles. For example, the azimuth electrodes 231a and 231b can also be a complementary polygonal pair.

[0069] It is understandable that when multiple touches occur on the same radius circle, the sensing amount of each touch point is difficult to separate. Therefore, in this embodiment, the azimuth electrode group 231 is split into two complementary triangular electrodes or polygonal electrodes. Therefore, each azimuth electrode is accompanied by certain radius information, and the position of the multi-finger touch can be more accurately determined by combining the azimuth electrode's azimuth information, the auxiliary radius information, and the radius information of the radius electrode group 233.

[0070] See also Fig.10 The third embodiment of the present invention provides a self-capacitive touch screen 300. The self-capacitive touch screen 300 includes a center electrode R0 and a plurality of electrode units 33. Each electrode unit 33 includes an azimuth electrode group 331 and a radius electrode group 333. The azimuth electrode group 331 includes a pair of azimuth electrodes, for example, two complementary triangular azimuth electrodes 331a and 331b. Each radius electrode group 333 includes two radius electrodes R1 and R2 arranged along the radial direction.

[0071] In this embodiment, the structure of the self-capacitive touch screen 300 is similar to that of the self-capacitive touch screen 200 in the second embodiment, except that the connection method of the azimuth electrode group 331 in the self-capacitive touch screen 300 is different from that of the azimuth electrode group 231 in the second embodiment.

[0072] In this embodiment, the azimuth electrode group 331 is connected in a skipping or spacing manner. Fig.10 In the direction shown in , the azimuth electrode 331a in one azimuth electrode group 331 is driven separately, and the azimuth electrode 331b in the azimuth electrode group 331 that is complementary to the azimuth electrode 331a is connected to the azimuth electrode 331a in the adjacent azimuth electrode group 331, while the azimuth electrode 331b in the adjacent azimuth electrode group 331 is driven separately. And so on, until all azimuth electrode groups 331 are connected.

[0073] Understandably, Fig. 9 In the self-capacitive touch screen 200 shown in the figure, since each azimuth electrode group 231 is divided into two complementary triangular azimuth electrodes 231a and 231b, and each pair of complementary azimuth electrodes 231a and 231b is driven by two different leads, the number of pads required for the azimuth electrode group 231 is relatively small. Figure 8 The number of pads required for the azimuth electrode group 131 is doubled. In this embodiment, since the azimuth electrode 331a or 331b in the azimuth electrode group 331 is interconnected with the azimuth electrode 331a or 331b in the adjacent azimuth electrode group 331, the number of azimuth electrodes that need to be driven independently is significantly reduced. For example, Fig. 9The self-capacitive touch screen 200 shown requires 16 independent channels (pitch, i.e. 16 leads). Fig.10 The self-capacitive touch screen 300 shown is reduced to 12 channels (pitch, ie 12 leads).

[0074] See also Fig.11a and Fig.11b The fourth embodiment of the present invention provides a self-capacitive touch screen 400. The self-capacitive touch screen 400 includes a center electrode R0 and a plurality of electrode units 43. Each electrode unit 43 includes an azimuth electrode group 431 and a radius electrode group 433. The azimuth electrode group 431 includes a pair of azimuth electrodes 431a and 431b. Each radius electrode group 433 includes at least two radius electrodes arranged along the radial direction.

[0075] In this embodiment, the structure of the self-capacitive touch screen 400 is similar to that of the self-capacitive touch screen 300 in the third embodiment, except that the structure of the radius electrode group 433 in the self-capacitive touch screen 400 is different from that of the radius electrode group 333 in the third embodiment.

[0076] Specifically, the touch error of the touch screen proposed by the present invention can be divided into radius error and circumference error. Among them, the radius error is related to the size of the radius block (i.e., radius electrode) in the radial direction. For example, please refer to Figure 8 and Fig. 9 When the dimensions of the radius electrodes R1 and R2 in the radial direction, such as the length along the radial direction, are set to be the same, the error in the radial direction can be considered to be linear, and the radius error can be reduced by increasing the number of radius electrodes along the radial direction.

[0077] In addition, along the circumferential direction, since the arc length of the radius electrodes R1 and R2 from the center to the circumference gradually increases, the circumferential error is nonlinear. Among them, the arc length of the radius electrode R1 close to the center is shorter, and its error is smaller. However, the arc length of the radius electrode R2 close to the circumference is longer, and its error is larger.

[0078] Therefore, in this embodiment, each radius electrode group 433 in the self-capacitive touch screen 400 includes three radius electrodes, namely, radius electrodes R1, R2, and R3. Among them, the radius electrodes R2 and R3 are arranged on the same radius and arranged along the radial direction with the radius electrode R1. In other words, the self-capacitive touch screen 400 is achieved by adding a radius electrode R3 at the radius electrode R2 with a larger circumferential error, that is, arranging two radius electrodes R2 and R3 on the same radius. In other words, the self-capacitive touch screen 400 is achieved by splitting the outermost radius electrode into a pair of sub-radius electrodes, such as radius electrodes R2 and R3. In this way, between the two azimuth electrode groups 431, the two radius electrodes R2 and R3 also carry auxiliary azimuth information. Therefore, the maximum PITCH along the circumferential direction is reduced to half of the original, the maximum arc length is reduced to half of the original, and the circumferential error is also reduced to half of the original.

[0079] Understandable, see Fig.11a In this embodiment, the radius electrodes R2 and R3 have the same shape and structure, that is, a block shape, such as a polygonal shape. Of course, in other embodiments, the radius electrodes R2 and R3 can also be other shapes, such as a triangle (see Fig.11b ), and the radius electrodes R2 and R3 are complementary to each other. That is, the pair of sub-radius electrodes arranged at the outermost periphery are complementary triangular pairs or polygonal pairs.

[0080] It can be understood that in this embodiment, there are two ways to connect the radius electrodes R2 and R3, for example, a single lead wire method or a jump or interval connection method. Fig. 9 The connection method of the azimuth electrodes 231a and 231b in the self-capacitive touch screen 200 is shown as follows: Fig.10 The connection method of the azimuth electrodes 331a and 331b in the self-capacitive touch screen 300 is not repeated here.

[0081] Understandable, please refer to Figures 8 to 10 In this case, when not adopting Fig.11a and Fig.11b In the error compensation scheme described in , when the outermost radius electrode is not split into two sub-radius electrodes, the radius of the self-capacitive touch screen is defined as R, and L azimuth electrodes extend along the circumferential direction. Obviously, Figure 8 It can be seen that the PITCH gradually increases from the center to the outer circumference. Among them, the arc length of the PITCH at the outer circumference is On the contrary, when the maximum arc length is specified as P, L azimuth electrodes need to be arranged, where At the same time, in order to realize true multi-touch, it is assumed that the number of radius electrodes in each radius electrode group is N (excluding the center electrode R0).

[0082] Therefore, for Figure 8 In the first embodiment shown, the number of bonding pads BP required by the self-capacitive touch screen 100 is BP=L+N. Fig. 9 In the second embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 200 is BP=2*L+N. Fig.10 In the third embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 300 is BP=1.5*L+N.

[0083] Please refer to Table 1. Take a two-inch circular figure as an example, assuming that the radius is 25mm and N=3. Obviously, in the first embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels (i.e., the number of leads) are 17, 21, and 29, respectively. In the second embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels is 31, 40, and 55, respectively. In the third embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels is 24, 30, and 42, respectively. Obviously, after adopting the third embodiment, as the PITCH decreases, the number of channels (the number of leads) decreases significantly.

[0084] Table 1 Relationship between the maximum PITCH size and the number of channels in the first embodiment, the second embodiment and the third embodiment when the error compensation scheme is not adopted

[0085]

[0086] Understandably, when using Fig.11a and Fig.11b When the error compensation scheme described in Figure 8 In the first embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 100 is BP=0.5*L+N+1. Fig. 9 In the second embodiment shown, the number of bonding pads BP required by the self-capacitive touch screen 200 is BP=L+N+1. Fig.10 In the third embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 300 is BP=0.75*L+N+1.

[0087] Please refer to Table 2, also taking a two-inch circular figure as an example, assuming that the radius is 25mm, and N=3. Obviously, in the first embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels (i.e., the number of leads) are 11, 13, and 17, respectively. In the second embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels are 18, 22, and 30, respectively. In the third embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels are 16, 18, and 24, respectively. Obviously, when the error compensation scheme is adopted, as the PITCH is reduced, the number of channels (the number of leads) is greatly reduced.

[0088] Table 2 Relationship between the maximum PITCH size and the number of channels in the first embodiment, the second embodiment, and the third embodiment when the error compensation scheme is adopted

[0089]

[0090] Please also read Fig.12a and Figure 12b The fifth embodiment of the present invention provides a self-capacitive touch screen 500. The self-capacitive touch screen 500 includes a center electrode R0 and a plurality of electrode units 53. Each electrode unit 53 includes an azimuth electrode group 531 and a radius electrode group 533. Each azimuth electrode group 531 includes an azimuth electrode 531a. Each radius electrode group 533 includes at least two radius electrodes arranged along the radial direction.

[0091] In this embodiment, the structure of the self-capacitive touch screen 500 is similar to that of the self-capacitive touch screen 100 in the first embodiment, except that the self-capacitive touch screen 500 is a square or a square touch screen with arc corners, that is, the conductive layer pattern of the self-capacitive touch screen 500 is a square (see Fig.12a ) or a square with curved corners (see Figure 12b ). Specifically, the self-capacitive touch screen 500 is a circle with a certain radius, such as half of the diagonal of the square or the square with arc angles, with the geometric center of the square or the square with arc angles as the center. The center electrode R0 is set at the geometric center of the self-capacitive touch screen 500. The azimuth electrode group 531 and the radius electrode group 533 are alternately arranged along the circumferential direction and insulated from each other.

[0092] It can be understood that the structure of the self-capacitive touch screen 500 is different from the self-capacitive touch screen 100 in the first embodiment in that the number of radius electrodes in each radius electrode group 533 is different. In this embodiment, each radius electrode group 533 includes three radius electrodes R1, R2, and R3 arranged along the radial direction, that is, the self-capacitive touch screen 500 supports true three-point touch in the radial direction.

[0093] It can be understood that in this embodiment, since the self-contained touch screen 500 is a square or a square touch screen with arc corners, it performs a circular sweep with its geometric center, so the intersection lengths of the two in each sweep direction are inconsistent. Fig.12a and Figure 12b As shown, in the diagonal direction, the length of the radius electrode group 533 is the longest, and in the length or width direction, the length of the radius electrode group 533 is the shortest. Fig.12a and Figure 12b When the electrodes are arranged in this manner, the length of the radius electrode group 533 will change periodically from the diagonal direction to the X (Y) axis direction, thereby affecting the uniformity of the radius information.

[0094] See also Fig.13 The sixth embodiment of the present invention provides a self-capacitive touch screen 600. The self-capacitive touch screen 600 includes a center electrode R0 and a plurality of electrode units 63. Each electrode unit 63 includes an azimuth electrode group 631 and a radius electrode group 633. Each azimuth electrode group 631 includes an azimuth electrode 631a. Each radius electrode group 633 includes three radius electrodes R1, R2, and R3 arranged along the radial direction.

[0095] It can be understood that in this embodiment, the structure of the self-capacitive touch screen 600 is similar to that of the self-capacitive touch screen 500 in the fifth embodiment, except that the length configuration of the azimuth electrode group 631 and the radius electrode group 633 in the self-capacitive touch screen 600 is different from the length configuration of the azimuth electrode group 531 and the radius electrode group 533 in the self-capacitive touch screen 500. Specifically, in this embodiment, each radius electrode group 633 is configured to be equal in length, while each azimuth electrode group 631 has different lengths in each direction.

[0096] Obviously, in this embodiment, since each radius electrode group 633 is configured to be equal in length, the uniformity problem of the radius electrode in each direction can be effectively solved. Although the lengths of each azimuth electrode group 631 in each direction are different, since the azimuth electrodes 631a in the azimuth electrode group 631 are mainly used to indicate directions, even if the lengths are different, the impact is small.

[0097] See also Fig.14The seventh embodiment of the present invention provides a self-capacitive touch screen 700. The self-capacitive touch screen 700 includes a center electrode R0 and a plurality of electrode units 73. Each electrode unit 73 includes an azimuth electrode group 731 and a radius electrode group 733. Each azimuth electrode group 731 includes a pair of azimuth electrodes 731a and 731b.

[0098] It can be understood that in this embodiment, the structure of the self-capacitive touch screen 700 is similar to that of the self-capacitive touch screen 200 in the second embodiment, except that the self-capacitive touch screen 700 is a square touch screen with arc corners, and the self-capacitive touch screen 700 supports true three-point touch in the radial direction (i.e., each radius electrode group 733 includes three radius electrodes R1, R2, and R3 arranged along the radial direction). In addition, the difference between the self-capacitive touch screen 700 and the self-capacitive touch screen 200 in the second embodiment is that the length configuration of the azimuth electrode group 731 and the radius electrode group 733 in the self-capacitive touch screen 700 is different, and the specific description can be combined with reference to Fig. 9 and Fig.13 The description will not be repeated here.

[0099] See also Fig.15 The eighth embodiment of the present invention provides a self-capacitive touch screen 800. The self-capacitive touch screen 800 includes a center electrode R0 and a plurality of electrode units 83. Each electrode unit 83 includes an azimuth electrode group 831 and a radius electrode group 833. Each azimuth electrode group 831 includes a pair of azimuth electrodes 831a and 831b.

[0100] It can be understood that in this embodiment, the structure of the self-capacitive touch screen 800 is similar to that of the self-capacitive touch screen 300 in the third embodiment, except that the self-capacitive touch screen 800 is a square touch screen with arc corners, and the self-capacitive touch screen 800 supports true three-point touch in the radial direction (i.e., each radius electrode group 833 includes three radius electrodes R1, R2, and R3 arranged along the radial direction). In addition, the self-capacitive touch screen 800 is different from the self-capacitive touch screen 300 in the third embodiment in that the length configuration of the azimuth electrode group 831 and the radius electrode group 833 in the self-capacitive touch screen 800 is different. For specific descriptions, please refer to Fig.10 and Fig.13 The description will not be repeated here.

[0101] See also Fig.16a and Fig.16bThe ninth embodiment of the present invention provides a self-capacitive touch screen 900. The self-capacitive touch screen 900 includes a center electrode R0 and a plurality of electrode units 93. Each electrode unit 93 includes an azimuth electrode group 931 and a radius electrode group 933. Each azimuth electrode group 931 includes a pair of azimuth electrodes 931a and 931b.

[0102] It can be understood that in this embodiment, the structure of the self-contained touch screen 900 is similar to Fig.11a and Fig.11b The structure of the self-capacitive touch screen 400 in the fourth embodiment is similar, except that the self-capacitive touch screen 900 is a square touch screen with arc corners, and the self-capacitive touch screen 900 supports true three-point touch along the radial direction. In addition, the self-capacitive touch screen 900 is different from the self-capacitive touch screen 400 in the fourth embodiment in that the length configuration of the azimuth electrode group 931 and the radius electrode group 933 in the self-capacitive touch screen 900 is different. For specific description, please refer to Fig.11a , Fig.11b and Fig.13 The description will not be repeated here.

[0103] Understandable, please refer to Figures 13 to 15 In this case, when not using Fig.16a and Fig.16b The error compensation scheme described in the above, that is, when the outermost radius electrode is not split into two complementary sub-radius electrodes R3 and R4, the radius of the self-capacitive touch screen is defined as R, and L azimuth electrodes extend along the circumferential direction. Obviously, by Fig.13 It can be seen that the PITCH gradually increases from the center to the outer circumference. Among them, the arc length of the PITCH at the outer circumference is On the contrary, when the maximum arc length is specified as P, L azimuth electrodes need to be arranged, where At the same time, in order to realize true multi-touch, it is assumed that the number of radius electrodes in each radius electrode group is N (excluding the center electrode R0).

[0104] Therefore, for Fig.13 In the sixth embodiment shown, the number of bonding pads BP required by the self-capacitive touch screen 600 is BP=L+N. Fig.14 In the seventh embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 700 is BP=2*L+N. Fig.15 In the eighth embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 800 is BP=1.5*L+N.

[0105] Please refer to Table 3. Take a two-inch square graphic as an example, assuming that the length (width) is 50mm, and N=3. Obviously, in the sixth embodiment, when the size of the maximum PITCH is 11mm, 8.5mm, and 6mm, the number of channels (i.e., the number of leads) is 21, 26, and 36, respectively. In the seventh embodiment, when the size of the maximum PITCH is 11mm, 8.5mm, and 6mm, the number of channels is 39, 50, and 70, respectively. In the eighth embodiment, when the size of the maximum PITCH is 11mm, 8.5mm, and 6mm, the number of channels is 30, 38, and 53, respectively. Obviously, after adopting the eighth embodiment, as the PITCH decreases, the number of channels (the number of leads) decreases significantly.

[0106] Table 3 Relationship between the maximum PITCH size and the number of channels in the sixth embodiment, the seventh embodiment and the eighth embodiment when the error compensation scheme is not adopted

[0107]

[0108]

[0109] Understandably, when using Fig.16a and Fig.16b When the error compensation scheme described in Fig.13 In the sixth embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 600 is BP=0.5*L+N+1. Fig.14 In the seventh embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 700 is BP=L+N+1. Fig.15 In the eighth embodiment shown, the number of bonding pads BP required for the self-capacitive touch screen 800 is BP=0.75*L+N+1.

[0110] Please refer to Table 4, also taking a two-inch square graphic as an example, assuming that the length (width) is 50mm, and N=3. Obviously, in the sixth embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels (i.e., the number of leads) are 13, 16, and 21, respectively. In the seventh embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels is 22, 28, and 37, respectively. In the eighth embodiment, when the sizes of the maximum PITCH are 11mm, 8.5mm, and 6mm, respectively, the number of channels is 18, 22, and 29, respectively. Obviously, after adopting the error compensation scheme, as the PITCH is reduced, the number of channels (the number of leads) is greatly reduced.

[0111] Table 4 Relationship between the maximum PITCH size and the number of channels in the sixth embodiment, the seventh embodiment and the eighth embodiment when the error compensation scheme is adopted

[0112]

[0113] It can be understood that in other embodiments, the number of azimuth electrodes and the number of radius electrodes can be flexibly set based on the size of the radius and the performance requirements.

[0114] For example, see also Fig.17a The tenth embodiment of the present invention provides a self-capacitive touch screen 1000. The self-capacitive touch screen 1000 includes a center electrode R0 and a plurality of electrode units 103. Each electrode unit 103 includes an azimuth electrode group 1031 and a radius electrode group 1033. The azimuth electrode group 1031 includes a pair of azimuth electrodes 1031a and 1031b. Each radius electrode group 1033 includes at least two radius electrodes arranged along the radial direction.

[0115] In this embodiment, each radius electrode group 1033 in the self-capacitive touch screen 1000 includes five radius electrodes, namely, radius electrodes R1, R2, R3, R4, and R5. Among them, the radius electrodes R4 and R5 are arranged on the same radius, and are arranged in the radial direction in sequence with the radius electrodes R1, R2, and R3. In other words, the self-capacitive touch screen 1000 is achieved by adding a radius electrode R5 at the radius electrode R4 with a larger circumferential error, that is, arranging two radius electrodes R4 and R5 on the same radius. In this way, between the two azimuth electrode groups 1031, the two radius electrodes R4 and R5 also carry auxiliary azimuth information. Therefore, the maximum PITCH along the circumferential direction is reduced to half of the original, the maximum arc length is reduced to half of the original, and the circumferential error is also reduced to half of the original.

[0116] Furthermore, in this embodiment, the self-capacitive touch screen 1000 supports true four-point touch along the radial direction and true eight-point touch along the diameter direction.

[0117] For example, please also refer to Fig.17b The eleventh embodiment of the present invention provides a self-capacitive touch screen 1100. The self-capacitive touch screen 1100 includes a center electrode R0 and a plurality of electrode units 113. Each electrode unit 113 includes an azimuth electrode group 1131 and a radius electrode group 1133. The azimuth electrode group 1131 includes an azimuth electrode 1131a. Each radius electrode group 1133 includes four radius electrodes R1, R2, R3, and R4 arranged along the radial direction.

[0118] It can be understood that in this embodiment, the self-capacitive touch screen 1100 supports true four-point touch along the radial direction and true eight-point touch along the diameter direction.

[0119] Please also read Fig.18 , below, taking a self-capacitive touch screen 1200 that does not adopt an error compensation solution and supports true three-point touch along the radial direction as an example, its connection method is briefly explained.

[0120] In this embodiment, the self-capacitive touch screen 1200 includes a center electrode R0 and a plurality of electrode units 123. Each electrode unit 123 includes an azimuth electrode group 1231 and a radius electrode group 1233. Each azimuth electrode group 1231 includes an azimuth electrode 1231a. Each radius electrode group 1233 includes three radius electrodes R1, R2, and R3 arranged along the radial direction.

[0121] Among them, the radius electrodes R1 representing the same radius are partially or fully electrically connected internally. All radius electrodes R2 are partially or fully electrically connected internally and are insulated from the radius electrode R1. All radius electrodes R3 are partially or fully electrically connected internally and are insulated from the radius electrodes R1 and R2. In addition, all radius electrodes are connected on the inner side close to the center electrode R0.

[0122] It can be understood that the self-contained touch screen 1200 also includes a plurality of bonding pads 125, a plurality of first leads 126 and a plurality of second leads 127. The plurality of pads 125 are arranged on one side of the plurality of electrode units 123. The plurality of pads 125 can be arranged in a certain direction and arranged in a corresponding binding area. Each first lead 126 is used to connect the corresponding azimuth electrode group 1231 to the corresponding pad 125. Each second lead 127 is used to electrically connect electrodes of different radii, such as radius electrodes R1, R2, R3 and center electrode R0, to the corresponding pad 125, respectively.

[0123] It can be understood that in this embodiment, the leads connecting electrodes of different radii and the leads connecting the center electrode R0, such as the second lead 127, can be led out from the gap between one of the radius electrode groups 1233 and the adjacent azimuth electrode group 1231. The leads connecting the azimuth electrode 1231a, such as the first lead 126, can be led out from the outer periphery of the self-capacitive touch screen 1200. In this way, the first lead 126 and the second lead 127 connected to each pad 125 do not cross each other, thereby effectively avoiding the use of a bridge or a multi-layer electrode structure, reducing the process difficulty.

[0124] It can be understood that the plurality of pads 125 can also be electrically connected to a driver chip (not shown) via connecting wires, so as to transmit signals between the electrode unit 123 and the driver to achieve touch sensing.

[0125] It can be understood that since the radius electrode only includes radius information, the radius electrodes representing the same radius and isolated by the azimuth electrode group 1231 (such as the azimuth electrode 1231a) can be fully or partially connected internally without external wiring, thereby greatly saving the number of pads 125.

[0126] Obviously, the self-capacitive touch screen of the present invention uses the simplest single-layer self-capacitive process, which can realize real multi-point detection, overcome the shortcomings of traditional self-capacitive that can only realize single-point touch or partitioned two-point touch, and greatly improve the touch performance. At the same time, the present invention is suitable for special-shaped touch screens such as round or square. Compared with the traditional use of small square electrodes, it can significantly reduce the number of bonding pads, thereby comprehensively improving the competitiveness of single-layer self-capacitive products in terms of performance, price, structural requirements, etc.

[0127] It can be understood that another embodiment of the present invention further provides a touch display device. The touch display device includes the self-capacitive touch screen, display screen, connecting wires and driver chip described in the above embodiment. Among them, the self-capacitive touch screen is arranged on the display screen (ON-CELL) or integrated in the display screen (IN-CELL), and is electrically connected to the driver chip through the connecting wire. The self-capacitive touch screen collects touch information through the self-capacitance change of the touch electrodes, azimuth electrode group and radius electrode group arranged on the same layer.

[0128] Since the touch display device adopts the self-capacitive touch screen described in the above embodiment, the manufacturing cost is low and the number of bonding pads can be effectively reduced.

[0129] The touch display device is circular, quasi-circular, square or square with curved corners.

[0130] It is understood that another embodiment of the present invention further provides an electronic device. The electronic device includes the touch display device described in the above embodiment. Therefore, the manufacturing cost is low and the number of bonding pads can be effectively reduced. The electronic device can be a mobile phone, a tablet computer, a watch, etc.

[0131] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention. Those skilled in the art may also make other changes within the spirit of the present invention and apply them to the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. A self-contained touch screen, characterized in that: The self-capacitive touch screen includes: substrate; A plurality of electrode units, the plurality of electrode units are disposed on the substrate and arranged at intervals along the circumferential direction, each electrode unit comprises an azimuth electrode group and a radius electrode group, any adjacent azimuth electrode groups have the same angle difference, and a radius electrode group is disposed between two adjacent azimuth electrode groups; The azimuth electrode group includes one or a pair of azimuth electrodes, the one or a pair of azimuth electrodes extend along the radius of the circumference, and the radius electrode group includes at least two radius electrodes arranged along the radius direction of the circumference; and a plurality of first leads, the plurality of first leads being used to electrically connect the azimuth electrode groups to corresponding pads respectively; and A plurality of second leads, the plurality of second leads being used to electrically connect the radial electrodes of different radii to the corresponding pads respectively; The plurality of electrode units, the first lead wire and the second lead wire are all disposed on the same conductive layer; The coordinates of the touch point are obtained through the azimuth information of the azimuth electrode and the radius information of the radius electrode in the electrode unit.

2. The self-contained touch screen according to claim 1, characterized in that: The extension lengths of the radial electrodes in the radial electrode group along the radial direction are equal.

3. The self-contained touch screen according to claim 1, characterized in that: Radius electrodes having the same radius are partially or completely connected together.

4. The self-contained touch screen according to claim 1, wherein: The radius electrode arranged at the outermost periphery includes a pair of sub-radius electrodes, which are a complementary polygonal pair and are driven by two different second leads.

5. The self-contained touch screen according to claim 1, wherein: The radius electrode arranged at the outermost periphery includes a pair of sub-radius electrodes, which are a complementary polygonal pair, one of the sub-radius electrodes is driven by a single second lead, and the other sub-radius electrode is electrically connected to the adjacent sub-radius electrode in an adjacent pair of sub-radius electrodes and is driven by a single second lead, and the other sub-radius electrode in the adjacent pair of sub-radius electrodes is driven by a single second lead.

6. The self-contained touch screen according to claim 1, wherein: The first lead is led out from the outer periphery of the self-capacitive touch screen, and the second lead is led out from a gap between one of the radial electrode groups and an adjacent azimuth electrode group.

7. The self-contained touch screen according to claim 1, wherein: The azimuth electrode group includes a pair of azimuth electrodes, which are a pair of complementary polygonal electrodes and are driven by two different first lead lines.

8. The self-contained touch screen according to claim 1, characterized in that: The azimuth electrode group includes a pair of azimuth electrodes, which are a complementary polygonal pair, one of which is driven by a single first lead, and the other is electrically connected to the adjacent azimuth electrodes in the adjacent azimuth electrode group and are driven by a single first lead, and the other azimuth electrode in the adjacent azimuth electrode group is driven by a single first lead.

9. The self-contained touch screen according to claim 1, wherein: The self-capacitive touch screen also includes a center electrode. When the self-capacitive touch screen is circular or quasi-circular, the center electrode is arranged at the center of the self-capacitive touch screen. A circle is drawn with the radius of the self-capacitive touch screen. The azimuth electrode group and the radius electrode group are arranged according to the center and radius. The second lead is also used to electrically connect the center electrode to the corresponding pad.

10. The self-contained touch screen according to claim 1, characterized in that: The self-capacitive touch screen also includes a center electrode. When the self-capacitive touch screen is square or a square with arc corners, a circle is drawn with the geometric center of the square as the center and half of the diagonal of the square as the radius. The azimuth electrode group and the radius electrode group are arranged according to the center and the radius. The center electrode is arranged at the geometric center of the self-capacitive touch screen. The second lead is also used to electrically connect the center electrode to the corresponding pad.

11. A touch display device, characterized in that: The touch display device comprises a self-capacitive touch screen, a display screen, connecting wires and a driving chip as described in any one of claims 1 to 10. The self-capacitive touch screen is arranged on the display screen or integrated in the display screen and is electrically connected to the driving chip through the connecting wires.

12. The touch display device according to claim 11, wherein: The touch display device is circular, quasi-circular, square or square with curved corners.

Images