Touch display device and touch detection method

Abstract

The invention provides a touch display device and a touch detection method.The touch display device comprises a cover plate, a touch display module, a middle frame and a detection mechanism, the cover plate is arranged on the light emitting side of the touch display module, and the middle frame is arranged on the side, away from the cover plate, of the touch display module; an ink layer is arranged in the edge area of the surface, away from the touch display module, of the cover plate, the detection mechanism comprises a detection circuit and two detection contacts, the detection contacts make contact with the ink layer, the detection circuit is used for detecting impedance of the ink layer between the two detection contacts, and the detection contacts are used for detecting impedance of the ink layer between the two detection contacts. And outputting a first state signal representing the magnitude of the impedance. Compared with the prior art, the characteristic that the impedance of the ink layer on the cover plate changes before and after the ink layer encounters water is utilized, the detection mechanism is arranged for water entry detection of the touch display device, a follow-up touch chip can switch and use different firmware according to the water entry condition, and then the problem of poor touch is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and more specifically, to a touch display device and a touch detection method. Background Art

[0002] With the growing demand for smart wearable devices among consumers, various miniaturized and portable electronic devices, especially wearable devices (such as smart watches, smart bracelets, etc.) and small-screen devices (such as sports cameras), have been widely used in people's daily lives.

[0003] In order to meet the needs of users in underwater activities such as swimming and diving, device manufacturers have continuously explored and implemented a variety of waterproof technologies to ensure that the devices can operate normally underwater. However, the poor touch problem faced by the devices when entering and exiting water is still a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present disclosure is to provide a touch display device and a touch detection method to solve the technical problem of poor touch when the device is immersed in water in the related art.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A first aspect of the present disclosure provides a touch display device, comprising: a cover plate, a touch display module, a middle frame and a detection mechanism, wherein the cover plate is arranged on a light-emitting side of the touch display module, the middle frame is arranged on a side of the touch display module away from the cover plate, an ink layer is arranged in an edge area of ​​a surface of the cover plate away from the touch display module, the detection mechanism comprises a detection circuit and two detection contacts, the detection contacts are in contact with the ink layer, and the detection circuit is used to detect an impedance of the ink layer between the two detection contacts, and output a first state signal representing the size of the impedance.

[0007] Optionally, the detection circuit includes a current source and a first comparator, the current source includes a first end and a second end, the first comparator includes two input ends and an output end, the first end of the current source is connected to one of the input ends of the first comparator and one of the two detection contacts, the second end of the current source is connected to the other of the two detection contacts, the other input end of the first comparator is connected to a first reference voltage, and the output end of the first comparator outputs the first state signal.

[0008] Optionally, the touch display device also includes a touch chip, the touch chip includes a first firmware and a second firmware, the touch chip is connected to the output end of the detection circuit, the touch chip calls the first firmware when the first state signal is a first level, and calls the second firmware when the first state signal is a second level.

[0009] Optionally, two grooves are arranged on the surface of the middle frame facing the cover plate, and one of the detection contacts is arranged in each groove.

[0010] Optionally, the cover plate includes a touch display area corresponding to the position of the touch display module, the ink layer is arranged around the touch display area, and the orthographic projections of the two detection contacts on the cover plate do not overlap.

[0011] Optionally, the touch display area and the cover plate are polygonal, and the orthographic projections of the two detection contacts on the cover plate are located on a diagonal line of the cover plate.

[0012] Optionally, the touch display area and the cover plate are circular, and the orthographic projections of the two detection contacts on the cover plate are located on the diameter of the cover plate.

[0013] Optionally, the touch display device also includes a circuit board and a connector, the circuit board is arranged between the touch display module and the middle frame, the connector and the touch chip are arranged on the circuit board, and the output end of the detection circuit is connected to the touch chip via the connector.

[0014] Optionally, the detection circuit includes a voltage source, a first resistor and a second comparator, the voltage source includes a first end and a second end, the second comparator includes two input ends and an output end, the first end of the voltage source is connected to one end of the first resistor, the other end of the first resistor is connected to one of the input ends of the second comparator and one of the two detection contacts, the second end of the voltage source is connected to the other of the two detection contacts, the other input end of the second comparator is connected to a second reference voltage, and the output end of the second comparator outputs the first state signal.

[0015] A second aspect of the present disclosure provides a touch detection method, which is applied to the touch display device as described above, comprising the following steps:

[0016] Acquire a first status signal;

[0017] When the first state signal is at a first level, the first firmware is called to perform touch detection, and when the first state signal is at a second level, the second firmware is called to perform touch detection.

[0018] The beneficial effects of the present disclosure are as follows:

[0019] The touch display device of the disclosed embodiment utilizes the characteristic that the impedance of the ink layer on the cover plate changes before and after it meets water, and sets two detection contacts in contact with the ink layer. The impedance of the ink layer between the two detection contacts is detected by a detection circuit and a first state signal representing the impedance size is output, thereby realizing water entry detection of the touch display device. The subsequent touch chip can use the first state signal to determine the water entry situation and switch to use different firmware, thereby avoiding the occurrence of poor touch problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specific implementation methods of the present disclosure are further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 A top view of the touch display device provided by the present disclosure;

[0022] Figure 2 A schematic diagram of the film layer structure of the touch display device provided by the present disclosure along the AA' section line;

[0023] Figure 3 A schematic diagram of the planar distribution of detection contacts when the cover provided by the present disclosure is rectangular;

[0024] Figure 4 A schematic diagram of the planar distribution of detection contacts when the cover plate provided by the present disclosure is circular;

[0025] Figure 5 Another schematic diagram of the planar distribution of the detection contacts when the cover provided by the present disclosure is rectangular;

[0026] Figure 6 A circuit structure diagram of another embodiment of the detection circuit provided by the present disclosure;

[0027] Figure 7 This is a flow chart of the touch detection method provided by the present disclosure. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Please refer to Figure 1 to Figure 2 , Figure 1 is a top view of the touch display device provided by the present disclosure, Figure 2 is a schematic diagram of the film structure of the touch display device along the A-A' section line, as shown Figure 1 to Figure 2 As shown, the touch display device includes: a cover plate 10, a touch display module 20, a middle frame 30 and a detection mechanism, the cover plate 10 is arranged on the light-emitting side of the touch display module 20, the middle frame 30 is arranged on the side of the touch display module 20 away from the cover plate 10, an ink layer 110 is arranged in the edge area of ​​the surface of the cover plate 10 away from the touch display module 20, the detection mechanism includes a detection circuit 410 and two detection contacts 420, the two detection contacts 420 are in contact with the ink layer 110, and the detection circuit 410 is used to detect the impedance of the ink layer 110 between the two detection contacts 420, and output a first state signal representing the size of the impedance.

[0031] The touch display module 20 integrates display function and touch function. For example, the touch display module 20 may include a display panel and a touch screen disposed on the light emitting side of the display panel. Optionally, the touch screen may be a capacitive touch screen or the like.

[0032] Optionally, the cover plate 10 is a glass cover plate (CG), and the cover plate 10 is disposed above the touch display module 20 to provide protection for the touch display module 20 and prevent the touch display module 20 from being damaged by the outside world.

[0033] Among them, the cover plate 10 can match the shape of the touch display module 20. Exemplarily, when the touch display module 20 is polygonal, for example, a quadrilateral, the cover plate 10 is also a quadrilateral. When the touch display module 20 is circular, the cover plate 10 is also circular. It can be understood that the shapes of the cover plate 10 and the touch display module 20 can be various shapes according to the actual needs of the product. In addition, the shape of the cover plate 10 can also be different from the shape of the touch display module 20, as long as it can meet the product requirements.

[0034] The middle frame 30 is arranged on the side of the touch display module 20 away from the cover plate 10, that is, on the backlight side of the touch display module 20. The middle frame 30 and the glass cover plate 10 enclose a cavity, and the touch display module 20 is arranged in the cavity. Exemplarily, when the touch display module 20 is a quadrilateral, the middle frame 30 at least includes a first side plate, a second side plate, a third side plate and a fourth side plate located at the periphery of the touch display module 20 and connected in sequence, and a bottom plate arranged opposite to the touch display module 20. In this way, the middle frame 30 and the cover plate 10 form a cavity with a certain space after installation.

[0035] In the related art, during the manufacturing process of the touch display device, the cover plate 10 not only protects the touch display module 20 from external damage, but also affects the appearance and user experience of the product. Usually, an ink layer is set around the cover plate 10. On the one hand, the ink layer can cover the possible flaws or unevenness on the edge of the touch display module 20, making the product appearance more neat and beautiful. On the other hand, in some cases, the ink layer can also serve as an additional sealing layer to prevent moisture, dust and other impurities from invading the interior of the touch display module 20, thereby extending the service life of the product. For example, Figure 1 and Figure 2 As shown, when the cover plate 10 and the touch display module 20 are quadrilateral, an ink layer 110 is disposed in the peripheral edge regions of the cover plate 10 .

[0036] The impedance of the ink layer 110 changes after contacting water, that is, the impedance of the ink layer 110 is different in two environments: in water and outside water. Specifically, the impedance change of the ink layer 110 after contacting water can be divided into two situations, one is that the impedance increases, and the other is that the impedance decreases, which is determined by factors such as the composition and structure of the ink layer 110.

[0037] In the disclosed embodiment, the impedance change characteristic of the ink layer 110 on the cover plate 10 is used to detect water intrusion on the touch display device, without limiting the impedance change trend of the ink layer 110 after contacting water. For example, the following embodiments are described by taking the case where the impedance of the ink layer 110 decreases after contacting water as an example.

[0038] Specifically, the detection mechanism includes two detection contacts 420, which are metal contacts, and the ink layer 110 between the two detection contacts 420 can form a current path. For example, please refer to Figure 3 , the two detection contacts 420 contact different positions of the ink layer 110, so the ink layer 110 between the two detection contacts 420 is equivalent to a resistor. When the impedance of the ink layer 110 changes, the voltage detected at both ends of the resistor is different, that is, the voltage between the two detection contacts 420 is different. Therefore, by detecting the voltage of the ink layer 110 between the two detection contacts 420 by the detection circuit 410, it can be determined whether the impedance of the ink layer 110 changes, and then it can be determined whether the ink layer 110 contacts water, that is, whether the touch display device enters water.

[0039] Compared with the related art, the touch display device of the embodiment of the present disclosure utilizes the characteristic that the impedance of the ink layer on the cover plate changes before and after it meets water, and sets two detection contacts in contact with the ink layer. The impedance of the ink layer between the two detection contacts is detected by the detection circuit and a first state signal representing the impedance size is output. This can realize water entry detection of the touch display device. The subsequent touch chip can use the first state signal to determine the water entry situation and switch to different firmware, thereby avoiding the occurrence of poor touch problems.

[0040] In one possible implementation, the detection circuit 410 includes a current source 4110 and a first comparator 4120, the current source 4110 includes a first end and a second end, the first comparator 4120 includes two input ends and an output end, the first end of the current source 4110 is connected to one of the input ends of the first comparator 4120 and one of the two detection contacts 420, the second end of the current source 4110 is connected to the other of the two detection contacts 420, the other input end of the first comparator 4120 is connected to a first reference voltage Vref1, and the output end of the first comparator 4120 outputs the first state signal.

[0041] The first terminal and the second terminal of the current source 4110 are respectively one of the positive electrode and the negative electrode, for example, Figure 2As shown, the first end of the current source 4110 is the positive electrode (+), and the second end is the negative electrode (-). Assuming that the detection contact connected to the positive electrode of the current source 4110 through the first wire L1 is 420a, and the detection contact connected to the negative electrode of the current source 4110 through the second wire L2 is 420b, a current path is formed: the positive electrode of the current source 4110 passes through the first wire L1, the detection contact 420a, the ink layer 110, the detection contact 420b, the second wire L2 and returns to the negative electrode of the current source 4110. At this time, the voltage at the input terminal of the first comparator 4120 connected to the positive electrode of the current source 4110 can be expressed as U=I*R, where I represents the output current of the current source 4110, and R represents the loop impedance. If the impedance of the first wiring L1 and the second wiring L2 are not considered, the loop impedance can be understood as the impedance of the ink layer 110 between the detection contact 420a and the detection contact 420b. Therefore, the impedance change of the ink layer 110 can be obtained by detecting the change of U.

[0042] The output terminal Vout of the first comparator 4120 outputs a first state signal, and the first state signal includes two states: a first level and a second level, for example, the first level is a high level (for example, recorded as 1), the second level is a low level (for example, recorded as 0), or the first level is a low level and the second level is a high level. By reasonably setting the value of the first reference voltage Vref1, it can be achieved that the first state signal output by the first comparator 4120 has different values ​​before and after the touch display device enters the water. For example, when the first state signal is at the first level, it indicates that the environment is not in the water at this time, and when the first state signal is at the second level, it indicates that the environment is in the water at this time. Exemplarily, when the ink layer 110 is not in contact with water, that is, the touch detection device is in a non-water environment, by setting a suitable current source 4110 and a first reference voltage Vref1, the voltage U across the ink layer 110 is greater than the first reference voltage Vref1. At this time, the first comparator 4120 outputs a high level. When the ink layer 110 is in contact with water, that is, the touch detection device is in a water environment, the impedance of the ink layer 110 is reduced, resulting in U being less than the first reference voltage Vref1. At this time, the first comparator 4120 outputs a low level, thereby achieving environmental detection.

[0043] In the disclosed embodiment, the detection circuit 410 is equivalent to a multimeter, and can measure the impedance of the ink layer 110 between the two detection contacts 420a and 420b. According to the detection result, it can be determined whether the touch display device is immersed in water.

[0044] In one possible implementation, Figure 6As shown, the detection circuit 410 includes a voltage source 4130, a first resistor R1 and a second comparator 4140, the voltage source 4130 includes a first end and a second end, the second comparator 4140 includes two input ends and an output end, the first end of the voltage source 4130 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one input end of the second comparator 4140 and one of the two detection contacts 420, the second end of the voltage source 4130 is connected to the other one of the two detection contacts 420, the other input end of the second comparator 4140 is connected to the second reference voltage Vref2, and the output end of the second comparator 4140 outputs the first state signal.

[0045] In the embodiment of the present disclosure, the detection circuit formed by the voltage source 4130, the first resistor R1 and the second comparator 4140 can also detect the impedance of the ink layer 110. Specifically, Figure 6 In which 420a and 420b represent two detection contacts respectively, Rx represents the equivalent impedance of the ink layer 110 between the detection contacts 420a and 420b, and the voltage U1 at the detection contact 420a is the voltage in the ink layer 110. The impedance change of the ink layer 110 can be obtained by detecting the change of U1.

[0046] It can be understood that in the embodiments of the present disclosure Figure 2 and Figure 6 Only two detection circuits are illustrated, and in actual needs, other detection circuits can be set according to specific requirements such as detection accuracy, which mainly utilize the impedance change characteristics of the ink layer before and after it meets water.

[0047] In a possible implementation, the touch display device also includes a touch chip (Touch Integrated Circuit, TIC) 50, which is connected to the output end of the detection circuit 40. The touch chip 50 calls the first firmware (Firmware1) when the first state signal is at a first level, and calls the second firmware (Firmware2) when the second state signal is at a second level.

[0048] Among them, the firmware is a program written into an erasable programmable read-only memory (EPROM) or an electrically erasable programmable read-only memory (EEPROM), which contains various touch parameters, such as capacitance parameters, sensitivity, response speed, etc. These touch parameters are needed when performing touch detection.

[0049] In the disclosed embodiment, two sets of firmware, namely Firmware1 and Firmware2, are set in the touch chip, and different firmware are switched in different environments. For example: in a conventional non-submerged environment, that is, when the first state signal is at the first level, the touch chip 50 uses Firmware1 for touch detection. Firmware1, as the firmware in the conventional non-submerged state, provides standard touch functions and performance; in a submerged environment, that is, when the first state signal is at the second level, the touch chip 50 uses Firmware2 for touch detection. Firmware2 is a firmware specially debugged for underwater environments, which adjusts touch parameters and adds specific compensation values ​​(Offset) to meet the special needs of underwater touch.

[0050] When the first comparator 4120 outputs the first state signal, the firmware switching logic inside the touch chip 50 will be immediately started, and Firmware2 will be selectively loaded or Firmware1 will be maintained according to the level of the first state signal, so as to adapt to the touch sensitivity of the underwater environment and alleviate the occurrence of problems such as poor underwater touch. Among them, it is necessary to determine the best compensation value through multiple experiments and debugging in advance, so that Firmware2 can show good touch performance in the underwater environment.

[0051] In one possible implementation, Figure 2 As shown, the touch display device also includes a circuit board 60 and a connector 70. The circuit board 60 is arranged between the touch display module 20 and the middle frame 30. The connector 70 is arranged on the circuit board 60. The output end of the detection circuit 410 is connected to the touch chip 50 via the connector 70.

[0052] Exemplarily, the circuit board is a flexible printed circuit (FPC), and various circuits required for the touch display device are arranged on the flexible printed circuit. Figure 2 As shown, the circuit board 60 is arranged below the touch display module 20, the touch chip 50 and the connector 70 are both arranged on the circuit board 60, and the output end of the detection circuit 410, that is, the output end of the first comparator 4120 is connected to the touch chip 50 via the connector 70, so that the detection circuit 410 can output the first state signal to the touch chip 50.

[0053] In a possible implementation, two grooves 310 are disposed on the surface of the middle frame 30 facing the cover plate 10 , and one detection contact 420 is disposed in each groove 310 .

[0054] In the disclosed embodiment, the number of the detection contacts 420 is at least two, and each detection contact 420 needs to contact the ink layer 110 on the cover plate 10. In a specific implementation, two grooves 310 can be provided on the surface of the middle frame 20 close to the cover plate 10, and a detection contact 420 is provided in each groove 310, that is, the grooves 310 correspond to the detection contacts 420 one by one.

[0055] Optionally, the cover plate 10 includes a touch display area 120 corresponding to the position of the touch display module 20 , the ink layer 110 is arranged around the touch display area 120 , and the orthographic projections of the two detection contacts 420 on the cover plate 10 do not overlap.

[0056] For example, taking the case where the cover plate 10 and the touch display module 30 are rectangular, the position correspondence between the touch display area 120 and the touch display module 30 can be understood as the position correspondence between the touch display area 120 and the effective display area of ​​the touch display module 30, and the ink layer 110 is a ring structure surrounding the touch display area 120. The non-overlapping orthographic projections of the two detection contacts 420 on the cover plate 10 can be understood as the non-overlapping orthographic projections of the respective detection contacts 420 on the cover plate 10, that is, the respective detection contacts 420 are arranged at different positions. With such arrangement, a section of the ink layer 110 will be formed between the two detection contacts 420, and water entry detection can be realized by detecting the impedance of the ink layer 110 between the two detection contacts 420.

[0057] Optionally, the touch display area and the cover plate are polygonal, and the orthographic projections of the two detection contacts on the cover plate are located on a diagonal line of the cover plate.

[0058] For example, assuming that the touch display area and the cover are rectangular, please refer to Figure 3 , Figure 3 Schematic diagram of the distribution of detection contacts in one embodiment, as shown in FIG. Figure 3 As shown, the two detection contacts 420 are distributed on a diagonal line of the cover plate. With this arrangement, the impedance change of the ink layer 110 between the two detection contacts 420 is more sensitive, that is, the impedance difference of the ink layer 110 is greater in the two environments before and after entering water.

[0059] Specifically, taking the case where the impedance of the ink layer 110 decreases after entering water as an example, Figure 3 As shown, assuming that the impedance of the ink layer 110 is equivalent to R, then R can be understood as R11 and R12 in parallel, where R11 represents Figure 3 The impedance of the branch above the dashed diagonal line is shown, R12 represents Figure 3The impedance of the branch below the dotted diagonal line is shown, and R=(R11*R12) / (R11+R12), wherein R11 and R12 are related to the length of the ink layer 110 between the two metal contacts 420. When the total length of the ink layer 110 is fixed, when the difference between R11 and R12 is smaller, the equivalent impedance R after R11 and R12 are connected in parallel is larger, and the change of U before and after entering the water is larger, which is easier to detect. Conversely, when the difference between R11 and R12 is larger, the equivalent impedance R after R11 and R12 are connected in parallel is smaller, and the change of U before and after entering the water is smaller. Therefore, in the embodiment of the present disclosure, the two detection contacts are set at the diagonal position.

[0060] It is understandable that in other embodiments, the distribution of the two detection contacts may be other distributions, for example, the two detection contacts are symmetrically distributed around the center point of the rectangle, as long as the impedances of the two branches of the ink layer 110 between the two detection contacts are equal under the same environment.

[0061] It is understandable that in other embodiments, the two detection contacts may also be distributed asymmetrically, as long as they are located at different positions. Figure 6 As shown, the equivalent impedance R of the ink layer 110 between the two detection contacts is the parallel connection of R13 and R14, wherein R13 is greater than R14.

[0062] Optionally, the touch display area and the cover plate are circular, and the orthographic projections of the two detection contacts on the cover plate are located on a diameter of the cover plate.

[0063] When the touch display area and the cover plate are circular, the ink layer 110 can be understood as a circular ring structure. In order to make the impedance change of the ink layer 110 between the two detection contacts more sensitive, Figure 4 As shown, the two detection contacts are located on one diameter of the cover.

[0064] The touch display device in the disclosed embodiment can be any product or component with touch function, such as a wearable device such as a smart bracelet, a smart watch, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., and this embodiment is not limited to this.

[0065] It is understandable that the display panel in the touch display module in the embodiment of the present disclosure can be an organic light-emitting diode (OLED) display panel. It is understandable that the display panel can also be set to other types according to actual needs, for example, the display panel can also be a quantum dot light emitting diode (QLED) display panel or a micro light emitting diode (Micro LED) display panel.

[0066] Based on the same inventive concept, the second aspect of the present disclosure provides a touch detection method, which is applicable to the touch display device as described above. Figure 7 As shown, the following steps are included:

[0067] Step S10, obtaining a first state signal;

[0068] Step S20: calling the first firmware to perform touch detection when the first state signal is at a first level, and calling the second firmware to perform touch detection when the first state signal is at a second level.

[0069] In the disclosed embodiment, two sets of firmware, namely Firmware1 and Firmware2, are set in the touch chip, and different firmware are switched in different environments. For example: in a conventional non-submerged environment, that is, when the first state signal is at the first level, the touch chip uses Firmware1 for touch detection. Firmware1, as the firmware in the conventional non-submerged state, provides standard touch functions and performance; in a submerged environment, that is, when the first state signal is at the second level, the touch chip uses Firmware2 for touch detection. Firmware2 is a firmware specially debugged for underwater environments, which adjusts touch parameters and adds specific compensation values ​​(Offset) to meet the special needs of underwater touch.

[0070] The touch chip is equipped with firmware switching logic. When the touch chip obtains the first state signal, the firmware switching logic will start immediately and selectively load Firmware2 or maintain Firmware1 according to the level of the first state signal. This can adapt to the touch sensitivity of the underwater environment and alleviate the occurrence of problems such as poor underwater touch.

[0071] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not limitations on the implementation methods of the present disclosure. For ordinary technicians in this field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A touch display device, characterized in that: include: A cover plate, a touch display module, a middle frame and a detection mechanism, wherein the cover plate is arranged on the light-emitting side of the touch display module, the middle frame is arranged on the side of the touch display module away from the cover plate, an ink layer is arranged in the edge area of ​​the surface of the cover plate away from the touch display module, the detection mechanism comprises a detection circuit and two detection contacts, the detection contacts are in contact with the ink layer, and the detection circuit is used to detect the impedance of the ink layer between the two detection contacts and output a first state signal representing the size of the impedance.

2. The touch display device according to claim 1, characterized in that: The detection circuit includes a current source and a first comparator, the current source includes a first end and a second end, the first comparator includes two input ends and an output end, the first end of the current source is connected to one of the input ends of the first comparator and one of the two detection contacts, the second end of the current source is connected to the other of the two detection contacts, the other input end of the first comparator is connected to a first reference voltage, and the output end of the first comparator outputs the first state signal.

3. The touch display device according to claim 1, characterized in that: The touch display device also includes a touch chip, which includes a first firmware and a second firmware. The touch chip is connected to the output end of the detection circuit. The touch chip calls the first firmware when the first state signal is at a first level, and calls the second firmware when the first state signal is at a second level.

4. The touch display device according to claim 1, characterized in that: Two grooves are arranged on the surface of the middle frame facing the cover plate, and one detection contact is arranged in each groove.

5. The touch display device according to claim 1, characterized in that: The cover plate includes a touch display area corresponding to the position of the touch display module, the ink layer is arranged around the touch display area, and the orthographic projections of the two detection contacts on the cover plate do not overlap.

6. The touch display device according to claim 5, characterized in that: The touch display area and the cover plate are polygonal, and the orthographic projections of the two detection contacts on the cover plate are located on the diagonal line of the cover plate.

7. The touch display device according to claim 5, characterized in that: The touch display area and the cover plate are circular, and the orthographic projections of the two detection contacts on the cover plate are located on the diameter of the cover plate.

8. The touch display device according to claim 3, characterized in that: The touch display device further includes a circuit board and a connector. The circuit board is arranged between the touch display module and the middle frame. The connector and the touch chip are arranged on the circuit board. The output end of the detection circuit is connected to the touch chip via the connector.

9. The touch display device according to claim 1, characterized in that: The detection circuit includes a voltage source, a first resistor and a second comparator, the voltage source includes a first end and a second end, the second comparator includes two input ends and an output end, the first end of the voltage source is connected to one end of the first resistor, the other end of the first resistor is connected to one input end of the second comparator and one of the two detection contacts, the second end of the voltage source is connected to the other of the two detection contacts, the other input end of the second comparator is connected to a second reference voltage, and the output end of the second comparator outputs the first state signal.

10. A touch detection method, applied to the touch display device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Acquire a first status signal; When the first state signal is at a first level, the first firmware is called to perform touch detection, and when the first state signal is at a second level, the second firmware is called to perform touch detection.

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