Touch module, electronic equipment and touch detection method

Abstract

The invention provides a touch module, electronic equipment and a touch detection method. The touch module comprises a touch panel, a touch area of the touch panel comprises a first area and a second area, and the touch panel further comprises a first touch detection capacitor located in the first area and a second touch detection capacitor located in the second area, the coupling area of the first touch detection capacitor is larger than that of the second touch detection capacitor; the circuit board is electrically connected with the touch panel; the compensation capacitor is arranged on the circuit board, and the compensation capacitor is used for providing compensation charges for compensating the second touch detection capacitor. According to the embodiment of the invention, the compensation effect on the special-shaped area of the touch panel can be improved, and the touch detection accuracy is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of touch control, and in particular to a touch module, an electronic device and a touch detection method. BACKGROUND

[0002] Mutual-capacitance touch module is a commonly used touch module, which realizes touch detection through the capacitance formed between the transmitting electrode Tx and the receiving electrode Rx. However, due to functional requirements, the touch module may have a special-shaped area, such as a camera hole and a corner edge area of the touch module. Due to the irregular shape of these areas, the transmitting electrode Tx and the receiving electrode Rx need to be uniquely designed, which accordingly causes the effective coupling area between the transmitting electrode Tx and the receiving electrode Rx to be significantly reduced, affecting the accuracy of touch detection. SUMMARY

[0003] Embodiments of the present application provide a touch module, an electronic device and a touch detection method to solve the problem of the special-shaped area of the touch module.

[0004] To solve the above problems, the present application is implemented as follows:

[0005] In a first aspect, embodiments of the present application provide a touch module, comprising:

[0006] a touch panel, a touch area of the touch panel comprising a first area and a second area, the touch panel further comprising a first touch detection capacitor located in the first area and a second touch detection capacitor located in the second area, a coupling area of the first touch detection capacitor being greater than a coupling area of the second touch detection capacitor;

[0007] a circuit board, electrically connected to the touch panel;

[0008] a compensation capacitor, provided on the circuit board, the compensation capacitor being configured to provide a compensation charge for compensating the second touch detection capacitor.

[0009] In some embodiments, the second area comprises one or more of:

[0010] a camera aperture hole;

[0011] a rounded corner area of the touch panel.

[0012] In some embodiments, the compensation capacitor is a dynamic capacitor with adjustable charge amount.

[0013] In some embodiments, the sum of the maximum charge amount of the compensation capacitor and the maximum charge amount of the second touch detection capacitor is equal to the maximum charge amount of the first touch detection capacitor.

[0014] In a second aspect, an electronic device is provided, which includes the touch module of any one of the first aspect.

[0015] In a third aspect, a touch detection method is provided, which is applied to the electronic device of the second aspect, and includes the following steps:

[0016] detecting whether there is a touch operation on the second region;

[0017] compensating, according to a detection result of the touch operation on the second region, a charge amount of a second touch detection capacitor corresponding to the second region by the compensation capacitor.

[0018] In some embodiments, the compensating, according to the detection result of the touch operation on the second region, the second touch detection capacitor corresponding to the second region by the compensation capacitor includes:

[0019] in a case where no touch operation on the second region is detected, controlling a sum of the charge amount of the compensation capacitor and the second reference charge amount to be equal to a first reference charge amount;

[0020] wherein the first reference charge amount is a charge amount of the first touch detection capacitor when the first region is in a non-touch state, and the second reference charge amount is a charge amount of the second touch detection capacitor when the second region is in the non-touch state.

[0021] In some embodiments, the compensating, according to the detection result of the touch operation on the second region, the second touch detection capacitor corresponding to the second region by the compensation capacitor includes:

[0022] in a case where a touch operation on the second region is detected, detecting a change ratio of the charge amount of the second touch detection capacitor;

[0023] controlling a compensation charge amount of the compensation capacitor to change according to the change ratio of the charge amount of the second touch detection capacitor.

[0024] In some embodiments, the detecting whether there is a touch operation on the second region includes:

[0025] controlling each transmitting electrode of the electronic device to transmit a touch detection signal in turn;

[0026] when the transmitting electrode is a target transmitting electrode corresponding to the second region, detecting a charge amount of a target receiving electrode, wherein the target receiving electrode is a receiving electrode corresponding to the second region among a plurality of receiving electrodes;

[0027] when the charge amount of the target receiving electrode is less than the second reference charge amount, it is determined that there is a touch operation for the second region.

[0028] when the charge amount of the target receiving electrode is less than the second reference charge amount, it is determined that there is a touch operation for the second region.

[0029] In a fourth aspect, an electronic device is provided, which is configured to perform the touch detection method of any one of the third aspect.

[0030] The technical solution of the embodiments of the present application can avoid the problem that it is difficult to arrange a compensation capacitor due to the limited space of the sensor layer of the touch panel, so that the irregular area of the touch panel can be fully compensated, the compensation effect of the irregular area of the touch panel is improved, and the touch detection accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a structural schematic diagram of a touch panel provided by the embodiments of the present application;

[0033] Figure 2 is a circuit schematic diagram of a touch panel provided by the embodiments of the present application;

[0034] Figure 3 is a compensation charge amount schematic diagram of a touch panel provided by the embodiments of the present application;

[0035] Figure 4 is a compensation timing schematic diagram of a touch detection method provided by the embodiments of the present application. DETAILED DESCRIPTION

[0036] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] The terms "first", "second", etc. in the embodiments of the present application are used to distinguish similar objects, and do not necessarily mean a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily mean that only those steps or units clearly listed are included, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices. In addition, "and / or" is used in the present application to represent at least one of the connected objects, for example, A and / or B and / or C, which represents 7 cases including A alone, B alone, C alone, A and B both exist, B and C both exist, A and C both exist, and A, B and C all exist.

[0038] The embodiments of the present application provide a touch module, an electronic device and a touch detection method.

[0039] In the technical solution of the present embodiment, the touch module can refer to a display module with touch function, more specifically, to a mutual capacitance touch detection touch module.

[0040] The mutual capacitance touch panel includes a transmitting electrode Tx and a receiving electrode Rx. In the working process, the touch chip IC uses the driving circuit to output a square wave or sine wave signal of a specific frequency through the transmitting electrode Tx electrode, and the receiving electrode Rx electrode converts the received charge into a voltage signal through a charge amplifier (Programmable Gain Amplifier, PGA) and then transmits it to the processor after quantization by an analog-to-digital converter (Analog-to-digital Converter, ADC).

[0041] The touch chip IC drives each transmitting electrode Tx channel in turn, which can be from the first transmitting electrode Tx1 to the last transmitting electrode TxN, for example. After each drive, the signals of all receiving electrode Rx channels are read to construct a complete capacitance matrix.

[0042] Generally speaking, in the working process, first, the reference capacitance value of each node capacitance needs to be recorded in the non-touch state, which is used for subsequent signal quantity calculation.

[0043] When the user touches the touch panel, the user's finger contacts and separates from the touch panel, taking away part of the charge. In this way, the charge at the node corresponding to the touch operation decreases, and the specific detection result is reflected in the decrease of the detected capacitance value. In this way, the difference between the reference capacitance value in the non-touch state and the capacitance value after touch is the signal quantity, and the touch point coordinates are calculated by weighting the values of the signal quantities of each node.

[0044] In some embodiments, the touch panel provided in this application includes a first region and a second region as its touch area. The touch panel also includes a first touch detection capacitor located in the first region and a second touch detection capacitor located in the second region. The coupling area of ​​the first touch detection capacitor is larger than the coupling area of ​​the second touch detection capacitor.

[0045] In this embodiment, the second region refers to the irregularly shaped area of ​​the touch panel. In some embodiments, the second region includes one or more of the following: a camera aperture and rounded corner areas of the touch panel. Here, the irregularly shaped area refers to an area where the electrode arrangement is irregular due to physical design or functional requirements, resulting in a significant decrease in touch performance, mainly including the camera aperture and corner edge areas.

[0046] like Figure 1 As shown, in this embodiment, the touch panel includes a section along... Figure 1 There are a total of 18 emitter electrodes arranged laterally, from Tx1 to Tx18, along... Figure 1 The following example illustrates 40 receiving electrodes arranged vertically from Rx1 to Rx40. Thus, the coordinates of any node on the touch panel can be written as (Txm, Rxn), where m is an integer between 1 and 18, and n is an integer between 1 and 40.

[0047] The touch panel features an irregularly shaped camera recess (Tx10, Rx1) and four rounded corners (Tx1, Rx1, (Tx1, Rx40), (Tx18, Rx1), and (Tx18, Rx40). For this touch panel, the positions corresponding to the above five coordinates constitute the second region, and the diamond-shaped areas other than these five positions constitute the first region.

[0048] Taking the camera hole area as an example, the transmitting electrode Tx and receiving electrode Rx need to bypass the camera hole for routing. The effective coupling area of ​​the touch detection capacitor formed between the transmitting electrode Tx and the receiving electrode Rx is reduced, which makes the capacitance value of the touch detection capacitor formed in this area significantly different from that in the normal area. It performs poorly in capacitance uniformity test and has a high defect rate.

[0049] Meanwhile, because the electrode area in irregularly shaped areas is smaller than that in normal areas, the amount of charge carried away by the finger after touch is limited, resulting in low signal strength and a significant drop in signal-to-noise ratio in these areas. Furthermore, insufficient signal strength may also prevent the differentiation of adjacent touch points, potentially leading to a severe decrease in coordinate resolution and an increased rate of false touches.

[0050] In related technologies, optimization schemes for irregularly shaped regions can be broadly divided into two types.

[0051] The first is to optimize the electrode design of the touch layer, such as improving the electrode shape. For example, the electrode can be changed to a sawtooth shape to increase the occlusal area of the transmitting electrode Tx and the receiving electrode Rx. For another example, the electrode edge length can be increased to improve the electric field distribution. However, due to the space limitation of the touch layer, the compensation of the capacitance value is limited, and the capacitance value of the area after compensation is still significantly different from that of the normal area. Moreover, the process complexity of this scheme is increased, the cost is also increased, new parasitic capacitance can be introduced, the signal quality can be affected, the light transmittance can be affected, and the actual use effect can be affected.

[0052] Another way is to compensate by software gain. This way can amplify the signal in the special-shaped area, but also amplify the global noise, which can reduce the signal-to-noise ratio, and cannot improve the uniformity problem caused by the small capacitance value of the special-shaped area during production line testing.

[0053] In the technical scheme of the embodiment, the touch control module includes a touch panel, a circuit board, and a compensation capacitor.

[0054] Here, the circuit board refers to a driving circuit board for driving the touch panel to work. For example, it can be a flexible circuit board (FPC) that is bound to the touch panel, but is not limited to this. In the technical scheme of the embodiment, the compensation capacitor is integrated on the circuit board. The compensation capacitor is used to provide compensation for the compensation charge of the second touch detection capacitor, that is, to compensate for the amount of charge of the touch detection capacitor formed between the transmitting electrode Tx and the receiving electrode Rx in the special-shaped area.

[0055] The embodiment of the application provides a touch detection method. In one embodiment, the method includes the following steps:

[0056] Detecting whether there is a touch operation for the second area;

[0057] According to the detection result of the touch operation for the second area, the amount of charge of the second touch detection capacitor corresponding to the second area is compensated by the compensation capacitor.

[0058] In the technical scheme of the embodiment, the second touch detection capacitor is compensated according to the state of the second area.

[0059] In the technical scheme of the embodiment, the compensation capacitor is designed on the FPC, which solves the problem of limited compensation capacitance value caused by the limited internal space of the sensor layer of the touch panel, and can compensate the capacitance value of the special-shaped area to be consistent with that of the normal area. The scheme also solves the problem of limited compensation capacitance value caused by the limited space of the sensor layer in the electrode structure optimization scheme. Moreover, the scheme also improves the signal amount of the special-shaped area, enhances the signal-to-noise ratio, and solves the problem of reduced signal-to-noise ratio caused by the software gain compensation scheme. The touch detection result of the special-shaped area can be effectively improved.

[0060] In some embodiments, detecting whether a touch operation is applied to the second area includes:

[0061] The electronic device is controlled to sequentially transmit touch detection signals from each of its transmitting electrodes;

[0062] When the transmitting electrode is the target transmitting electrode corresponding to the second region, the charge amount corresponding to the target receiving electrode is detected, wherein the target receiving electrode is the receiving electrode corresponding to the second region among a plurality of receiving electrodes;

[0063] When the charge amount of the target receiving electrode is the second reference charge amount, it is confirmed that there is no touch operation targeting the second area;

[0064] When the charge of the target receiving electrode is less than the second reference charge, a touch operation is confirmed for the second area.

[0065] It's important to understand that the driving method for a capacitive touchscreen involves the driver chip IC sequentially driving each transmitting electrode Tx. After driving one transmitting electrode Tx, the signals from all receiving electrode Rx channels are read to construct a complete capacitance matrix. During operation, the reference capacitance values ​​of each node's capacitance need to be recorded in the non-touch state for subsequent signal calculations. In this embodiment, the charge of the first touch detection capacitor in the first region when it is in the non-touch state is recorded as the first reference charge, and the charge of the second touch detection capacitor in the second region when it is in the non-touch state is recorded as the second reference charge, thereby determining the corresponding first and second reference capacitances.

[0066] In some embodiments, the step of compensating the second touch detection capacitor corresponding to the second region through the compensation capacitor based on the detection result of the touch operation on the second region includes:

[0067] If no touch operation is detected for the second area, the sum of the charge of the compensation capacitor and the second reference charge is controlled to be equal to the first reference charge.

[0068] In some embodiments, the sum of the maximum charge of the compensation capacitor and the maximum charge of the second touch detection capacitor is equal to the maximum charge of the first touch detection capacitor.

[0069] like Figure 2 As shown, taking the (Tx1, Rx1) node as an example, the second touch detection capacitor of the node that the Tx1 channel drives the Rx1 channel to receive is denoted as... Its corresponding charge is The compensation capacitor is denoted as The compensation capacitor can be driven by an extra channel of the driving chip IC, and the corresponding charge amount of the compensation capacitor is The charge amount of the node after compensation is The charge amount after compensation is transmitted to the ADC and the back-end processor for calculation after PGA processing, and the capacitance value obtained after calculation is larger, and the uniformity of the position is improved.

[0070] In some embodiments, the compensation of the second touch detection capacitor corresponding to the second area by the compensation capacitor according to the detection result of the touch operation for the second area comprises:

[0071] In the case of detecting the touch operation for the second area, the change ratio of the charge amount of the second touch detection capacitor is detected;

[0072] The compensation charge amount of the compensation capacitor changes according to the change ratio of the charge of the second touch detection capacitor.

[0073] In some embodiments, the compensation capacitor is a dynamic capacitor with adjustable charge amount.

[0074] In the technical scheme of the embodiment, by setting the adjustable dynamic capacitor, the charge amount of the compensation charge before and after touch can be dynamically adjusted, the signal amount of the special-shaped area is improved, a higher compensation value is provided before touch, and a lower compensation value is provided after touch. Here, the difference between the compensation values before and after touch can be regarded as the part of the charge taken away by the finger, and by superimposing the signal actually taken away by the finger in the special-shaped area, the signal amount of the special-shaped area can be improved, which is helpful to further improve the touch detection precision.

[0075] As shown in Figure 3 , the charge amount flowing to the PGA when the special-shaped area is not touched is denoted as , the charge amount taken away by the finger after touch is denoted as , the charge amount compensated by the compensation capacitor is denoted as , the compensation value when not touched is denoted as , the compensation value after touch is denoted as , and the size of the difference between the charge amounts before and after touch corresponds to the size of the signal amount.

[0076] As shown in the left part of Figure 3 , when the special-shaped area is not compensated, the difference between the charge amounts before and after touch is , as shown in the right part of Figure 3 , after the compensation is started, the compensation value when not touched is , the compensation value after touch is adjusted to , , and the difference between the charge amounts before and after touch after compensation is , the signal quantity corresponding increases, and the unamplified noise signal, the signal-to-noise ratio is also improved.

[0077] It can be understood that the finger will take away part of the charge quantity when touching, the charge quantity of the node capacitor decreases, and the difference between the reference charge quantity in the non-touch state and the charge quantity after touching is the signal quantity. Then, the touch point coordinates are calculated by weighting the values of each node signal quantity.

[0078] In some embodiments, since the special-shaped area only exists in a specific position, only the specific channel needs to be compensated, so the transmission electrode Tx coding timing needs to be optimized synchronously, and the capacitance driving transmission electrode Tx needs to be compensated by time division coding to avoid unnecessary compensation of channels that do not need to be compensated, causing abnormal capacitance values at other positions, and also avoiding power waste.

[0079] As shown in Figure 4 , the figure shows the Tx channel coding timing and the corresponding compensation channel driving Tx timing diagram. As shown in Figure 1 , the touch panel including five special-shaped areas is used as an exemplary description.

[0080] At t1 period, the transmission electrode Tx1 and the transmission electrode Tx2 code, and the corresponding receiving electrodes Rx1 and Rx40 open compensation, and the remaining receiving electrodes do not need to open compensation, thus realizing compensation of the four round corner areas; similarly, at t2 period, the transmission electrode Tx10 codes, and the receiving electrode Rx1 opens compensation, thus completing the compensation of the camera avoidance hole. At t3 period, the channels that need to be compensated have ended coding, and the remaining channels do not need to open compensation. This design timing can realize the compensation of the capacitance value of the special-shaped area while not affecting the capacitance value calculation result of other positions. The application embodiment provides an electronic device comprising the touch module of any one of the above.

[0081] Since the technical solutions of the embodiments of the application can realize all the technical solutions of the above touch module embodiments, at least all the technical effects described above can be realized, and here is not repeated.

[0082] The above is the preferred embodiment of the application embodiment, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the application described, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A touch module, characterized in that, include: A touch panel, wherein the touch area of ​​the touch panel includes a first region and a second region, and the touch panel further includes a first touch detection capacitor located in the first region and a second touch detection capacitor located in the second region, wherein the coupling area of ​​the first touch detection capacitor is greater than the coupling area of ​​the second touch detection capacitor. The circuit board is electrically connected to the touch panel. A compensation capacitor is disposed on the circuit board, and the compensation capacitor is used to provide compensation charge to compensate the second touch detection capacitor.

2. The touch module according to claim 1, characterized in that, The second region includes one or more of the following: Camera clearance hole; The rounded corner area of ​​the touch panel.

3. The touch module according to claim 1 or 2, characterized in that, The compensation capacitor is a dynamic capacitor with adjustable charge.

4. The touch module according to claim 3, characterized in that, The sum of the maximum charge of the compensation capacitor and the maximum charge of the second touch detection capacitor is equal to the maximum charge of the first touch detection capacitor.

5. An electronic device, characterized in that, Includes the touch module according to any one of claims 1 to 4.

6. A touch detection method, applied to the electronic device of claim 5, characterized in that, Includes the following steps: Detect whether there is a touch operation targeting the second area; Based on the detection results of touch operations in the second area, the charge of the second touch detection capacitor corresponding to the second area is compensated by the compensation capacitor.

7. The method according to claim 6, characterized in that, The step of compensating the second touch detection capacitor corresponding to the second region based on the detection result of the touch operation for the second region includes: If no touch operation is detected targeting the second area, the sum of the charge of the compensation capacitor and the second reference charge is controlled to equal the first reference charge. Wherein, the first reference charge is the charge of the first touch detection capacitor when the first area is in a non-touch state, and the second reference charge is the charge of the second touch detection capacitor when the second area is in a non-touch state.

8. The method according to claim 6 or 7, characterized in that, The step of compensating the second touch detection capacitor corresponding to the second region based on the detection result of the touch operation for the second region includes: Upon detecting a touch operation targeting the second area, the percentage change in charge of the second touch detection capacitor is detected; The amount of compensation charge of the compensation capacitor is controlled to change proportionally to the charge change of the second touch detection capacitor.

9. The method according to claim 7, characterized in that, The detection of whether there is a touch operation targeting the second area includes: The electronic device is controlled to sequentially transmit touch detection signals from each of its transmitting electrodes; When the transmitting electrode is the target transmitting electrode corresponding to the second region, the charge amount corresponding to the target receiving electrode is detected, wherein the target receiving electrode is the receiving electrode corresponding to the second region among a plurality of receiving electrodes; When the charge amount of the target receiving electrode is the second reference charge amount, it is confirmed that there is no touch operation targeting the second area; When the charge of the target receiving electrode is less than the second reference charge, a touch operation is confirmed for the second area.

10. An electronic device, characterized in that, The electronic device is configured to perform the touch detection method according to any one of claims 6 to 9.

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