Touch screen

Abstract

The utility model relates to the technical field of display terminals, and discloses a touch screen. The touch screen provided by the utility model comprises a touch display panel, a functional equipment placement part and an identification module. The functional equipment placing part is arranged at the edge of the touch display panel and is used for placing functional equipment; the functional equipment placing part is also used for sending out a loudspeaker sound wave signal and collecting a feedback sound wave signal, and the feedback sound wave signal comprises the reflected loudspeaker sound wave signal. And the identification module is connected with the functional equipment placement part and is used for comparing the feedback sound wave signal with the characteristic signal to obtain the placement state of the functional equipment. After the feedback sound wave signal is collected through the functional equipment placing part, the functional equipment placing part can compare the feedback sound wave signal with the characteristic signal, and the placing state of the functional equipment can be obtained according to the comparison condition. The placement state of the functional device is obtained based on the acoustic signal, so that the influence of external illumination or magnetic field change can be avoided, and the error-tolerant rate is improved.

Description

Technical Field

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

[0002] Currently, large-screen devices with writable screens often feature a stylus placement area at the edge of the screen for placing a stylus there and detecting the stylus's placement status. Existing large-screen devices with writable screens typically use infrared or Hall effect sensors to detect stylus placement. However, these detection methods are easily affected by external lighting and magnetic field fluctuations, resulting in misidentification of placement status. Utility Model Content

[0003] The purpose of this application is to provide a touch screen, aiming to solve the problem of easy misidentification of the placement status of the stylus in traditional large-screen writable devices.

[0004] An embodiment of the present application provides a touch screen, comprising: a touch display panel; a functional device placement portion, wherein the functional device placement portion is arranged at an edge of the touch display panel and is used to place a functional device; the functional device placement portion is also used to emit an external sound wave signal and collect a feedback sound wave signal, wherein the feedback sound wave signal includes the external sound wave signal that has been reflected; an identification module, wherein the identification module is connected to the functional device placement portion, and the identification module is used to compare the feedback sound wave signal with a characteristic signal to obtain the placement status of the functional device.

[0005] In one embodiment, the functional device placement part includes a sound-emitting module and a collection module; the collection module is connected to the recognition module; the sound-emitting module is used to emit the external sound wave signal, and the collection module is used to collect the feedback sound wave signal.

[0006] In one embodiment, the sound-generating module includes a plurality of speakers, and the speakers are used to emit the external sound wave signal.

[0007] In one embodiment, the acquisition module includes a plurality of acoustic wave sensors, and the acoustic wave sensors are used to acquire the feedback acoustic wave signals.

[0008] In one embodiment, the sound-generating module includes two speakers, and the acquisition module includes two sound wave sensors.

[0009] In one embodiment, the functional device placement portion includes a first end and a second end relative to each other, wherein one of the speakers and one of the sound wave sensors are arranged at the first end of the functional device placement portion, and another of the speakers and another of the sound wave sensors are arranged at the second end of the functional device placement portion.

[0010] In one embodiment, the externally played sound wave signal includes an ultrasonic wave signal.

[0011] In one embodiment, the frequency of the external sound wave signal is greater than or equal to 40 kHz.

[0012] In one embodiment, the functional device includes a stylus.

[0013] In one embodiment, the touch screen further includes a shell, the touch display panel and the functional device placement portion are both arranged on the shell, and the identification module is arranged in the shell.

[0014] Compared to the prior art, the present embodiment has the following advantages: after the functional device placement unit collects a feedback acoustic wave signal, the recognition module compares the feedback acoustic wave signal with the characteristic signal to obtain the placement status of the functional device, which may be a stylus. Acquiring the placement status of the functional device based on acoustic waves can avoid the influence of external light or magnetic field changes, thereby improving fault tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical features of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 A schematic diagram of a touch screen provided in one embodiment of the present application;

[0017] Figure 2 Another schematic diagram of a touch screen provided in one embodiment of the present application;

[0018] Figure 3 A schematic diagram of a functional device placement portion provided in one embodiment of the present application;

[0019] Figure 4 Another schematic diagram of a functional device placement portion provided in one embodiment of the present application;

[0020] Figure 5 A schematic diagram of a sound generation module and a collection module provided in one embodiment of the present application;

[0021] Figure 6 A specific circuit diagram of a touch screen provided in one embodiment of the present application;

[0022] Figure 7 A flowchart of a method for detecting a functional device provided in one embodiment of the present application;

[0023] Figure 8This is a flowchart of step S100 provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes, and effects of the present application, the specific embodiments of the present application are described in further detail below in conjunction with the accompanying drawings and Examples. The following examples are only used to illustrate the present application, but are not used to limit the scope of protection of the present application. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without paying creative work should all fall within the scope of protection of the present application.

[0025] In the description of this application, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting this application.

[0026] In the description of this application, it should be understood that the numbers themselves, such as "first", "second", etc., are only used to distinguish the objects described, and have no sequential or technical meaning, and cannot be understood as stipulating or implying the importance of the objects described.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] In this application, the term "plurality" refers to two or more than two. Furthermore, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0029] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. Those of ordinary skill in the art will understand the specific meanings of the above terms in this application in specific circumstances.

[0030] When a touch screen is operating, it's necessary to constantly monitor the placement of a stylus in a specific location so that certain functions can be executed or stopped based on the stylus's placement. Existing detection methods using infrared or Hall sensors are easily affected by changes in external lighting and magnetic fields, leading to misidentification of the stylus's placement.

[0031] The embodiments of the present application provide a technical solution that can obtain the placement status of a functional device by utilizing sound waves without being affected by external light or magnetic field changes.

[0032] Figure 1 A schematic diagram of a touch screen provided in an embodiment of the present application is shown. For ease of explanation, only the portion related to this embodiment is shown, which is described in detail as follows:

[0033] The touch screen 10 includes a touch display panel 100 , a functional device placement portion 200 and an identification module 300 .

[0034] The functional device placement portion 200 can be positioned at the edge of the touch display panel 100 and is used to place functional devices. The functional device placement portion 200 is also configured to emit an external acoustic wave signal and collect a feedback acoustic wave signal, which includes the reflected external acoustic wave signal. The functional device placement portion 200 is connected to an identification module 300, which compares the feedback acoustic wave signal with the characteristic signal to determine the placement status of the functional device.

[0035] After the functional device placement unit 200 collects the feedback sound wave signal, the recognition module 300 can compare the feedback sound wave signal with the characteristic signal, and obtain the placement status of the functional device based on the comparison.

[0036] Acquiring the placement status of functional devices based on acoustic wave signals can avoid the influence of external light or magnetic field changes and improve fault tolerance.

[0037] It is understood that multiple different characteristic signals may be stored in the identification module 300, and each characteristic signal corresponds to a placement state of a functional device. For example, the placement state of a functional device may include: the functional device is correctly placed in the functional device placement portion 200, the functional device is incorrectly placed in the functional device placement portion 200, the functional device is not placed in the functional device placement portion 200, etc. Each placement state may be assigned a corresponding characteristic signal. When the feedback sound wave signal is identical to a characteristic signal, it can be determined that the placement state of the functional device corresponding to the feedback sound wave signal is identical to the placement state of the functional device corresponding to the characteristic signal, thereby obtaining the current placement state of the functional device.

[0038] The touch screen 10 can lock and unlock some functions according to the placement status of the functional device. For example, the touch screen 10 can lock the function controlled by the functional device after obtaining information that the functional device is placed in the functional device placement part 200 based on the placement status of the functional device.

[0039] The specific location of the functional device placement portion 200 can be set according to actual needs.

[0040] In one embodiment, if Figure 2 As shown, the functional device placement unit 200 includes a sound-generating module 210 and a collection module 220. The collection module 220 is connected to the recognition module 300. The sound-generating module 210 is used to generate external sound wave signals, and the collection module 220 is used to collect feedback sound wave signals.

[0041] It is understood that the external sound wave signal emitted by the sound module 210 will undergo acoustic reflection when the propagation medium changes. Whether the functional device is placed in the functional device placement portion 200 or changes in the relevant parameters of the functional device will result in different feedback sound wave signals transmitted to the acquisition module 220. Among them, the feedback sound wave signal includes the external sound wave signal that has been reflected and the external sound wave signal that is directly transmitted to the acquisition module 220.

[0042] The sound module 210 may continuously emit the sound wave signal, or may emit the sound wave signal once every certain time interval.

[0043] In one embodiment, the sound module 210 includes a plurality of speakers 211 .

[0044] The number and position of the loudspeakers 211 can be set according to actual needs. When there are multiple loudspeakers 211, each loudspeaker 211 can emit different or the same external sound wave signals.

[0045] In some embodiments, as Figure 3 As shown, the sound module 210 includes a speaker 211 .

[0046] In some embodiments, as Figure 4 As shown, the sound module 210 includes two speakers 211. The two speakers 211 are respectively arranged at two opposite ends of the functional device placement portion 200.

[0047] In some embodiments, as Figure 5 As shown, the sound module 210 also includes several power amplifier units 212, which can be connected to at least one speaker 211. The power amplifier unit 212 is used to drive the corresponding speaker 211 to emit the corresponding sound wave signal according to the control signal. The power amplifier unit 212 can be connected to the audio output terminal of the identification module 300 to obtain the control signal from the identification module 300. The power amplifier unit 212 can include a power amplifier chip. The power amplifier unit 212 can correspond one-to-one with the speaker 211.

[0048] In one embodiment, the acquisition module 220 includes a plurality of acoustic wave sensors 221. The acoustic wave sensors 221 are configured to generate and output feedback acoustic wave signals based on received acoustic waves.

[0049] The number and location of the acoustic wave sensors 221 can be set according to actual needs. When there are multiple acoustic wave sensors 221, each acoustic wave sensor 221 can output different or the same feedback acoustic wave signals. Accordingly, the characteristic signals corresponding to each acoustic wave sensor 221 can also be different. The acoustic wave sensor 221 can specifically include a microphone or an ultrasonic sensor.

[0050] In some embodiments, as Figure 3 As shown, the acquisition module 220 includes an acoustic wave sensor 221 .

[0051] In some embodiments, as Figure 4 As shown, the sound-generating module 210 includes two speakers 211 , and the acquisition module 220 includes two sound wave sensors 221 .

[0052] The functional device placement portion 200 includes a first end and a second end that are opposite to each other. For example, when the rectangular functional device placement portion 200 is placed horizontally on the touch screen 10, the first end and the second end of the functional device placement portion 200 are the leftmost and rightmost ends of the functional device placement portion 200. One speaker 211 and one acoustic wave sensor 221 are disposed at the first end of the functional device placement portion 200, and another speaker 211 and another acoustic wave sensor 221 are disposed at the second end of the functional device placement portion 200.

[0053] It is understood that if multiple speakers 211 and multiple acoustic wave sensors 221 are placed together, the feedback acoustic wave signals output by each acoustic wave sensor 221 will be essentially identical, and increasing the number of components will only have a limited effect on improving detection accuracy. By staggering the speakers 211 and acoustic wave sensors 221 in this embodiment, two feedback acoustic wave signals with a significant difference can be obtained. By determining the placement status of the functional device based on these two feedback acoustic wave signals, cross-validation can be performed, thereby improving accuracy.

[0054] The distance between the first and second ends of the functional device placement section 200 can be set based on the size of the functional device. After the functional device is determined, the distance between the first and second ends of the functional device placement section 200 can be set to be greater than the maximum length of the functional device. The maximum length refers to the distance between the two points on the functional device that are farthest apart.

[0055] In one embodiment, if Figure 3 、 Figure 4 As shown, the touch screen 10 includes a housing 11 , on which the touch display panel 100 and the functional device placement portion 200 are mounted. The identification module 300 is mounted in the housing 11 .

[0056] Specifically, the touch display panel 100 and the functional device placement portion 200 are both installed on the front of the housing 11 . The front of the housing 11 includes a frame surrounding the touch display panel 100 , and the functional device placement portion 200 can be set on the frame.

[0057] It is understandable that the functional device placement portion 200 can also be installed on the side or back of the shell 11, and the specific installation position of the functional device placement portion 200 can be changed according to the placement requirements of the functional device.

[0058] In some embodiments, as Figure 5 As shown, the acquisition module 220 also includes several analog-to-digital conversion units 222, which can be connected to the signal input terminal of the identification module 300 and at least one acoustic wave sensor 221, respectively. The analog-to-digital conversion units 222 are used to perform analog-to-digital conversion on the feedback acoustic wave signal to obtain and provide a digitized feedback acoustic wave signal to the identification module 300. The analog-to-digital conversion units 222 can include analog-to-digital conversion chips, and the analog-to-digital conversion units 222 can correspond one-to-one with the acoustic wave sensors 221.

[0059] In one embodiment, the characteristic signal includes a first comparison signal, which is identical to a feedback acoustic wave signal collected by the functional device placement portion 200 when the functional device placement portion 200 is in an empty state. The empty state of the functional device placement portion 200 means that no functional device is placed in the functional device placement portion 200 and no other objects are placed in the functional device placement portion 200.

[0060] Among them, the first comparison signal and can be obtained by testing in advance. For example, during the test, the functional device placement part 200 is arranged to be empty, the feedback sound wave signal obtained is recorded and used as the first comparison signal.

[0061] When the feedback sound wave signal collected subsequently is identical or almost identical to the first comparison signal, the functional device placement portion 200 can be regarded as being in an empty state, and the placement state of the functional device is identified.

[0062] In one embodiment, the characteristic signal includes a second comparison signal and a third comparison signal. The second comparison signal is the same as the feedback sound wave signal collected by the functional device placement portion 200 when a functional device of a first size is placed in the functional device placement portion 200. The third comparison signal is the same as the feedback sound wave signal collected by the functional device placement portion 200 when a functional device of a second size is placed in the functional device placement portion 200.

[0063] It can be understood that the second comparison signal and the second comparison signal respectively correspond to the situation where functional devices of two sizes are placed in the functional device placement part 200. When the feedback sound wave signal is basically the same as the second comparison signal or the second comparison signal, and when the specific parameters of the feedback sound wave signal are between the parameters corresponding to the second comparison signal and the third comparison signal, it can be regarded as that a functional device is placed in the functional device placement part 200.

[0064] In some embodiments, the first size is smaller than the second size. The first size may be the minimum size of a functional device actually used, and the second size may be the maximum size of a functional device actually used, so that functional devices of all sizes can be covered.

[0065] In one embodiment, the externally played sound wave signal includes an ultrasonic wave signal.

[0066] By utilizing the characteristics that ultrasonic signals are absorbed, penetrated, and reflected to different degrees when reaching surfaces of different materials, the recognition module 300 can identify functional devices based on the collected feedback sound wave signals.

[0067] In some embodiments, the frequency of the external sound wave signal is greater than or equal to 40 kHz. For example, the corresponding frequency band of the external sound wave signal can be 40 kHz to 45 kHz. The identification module 300 can also filter the feedback sound wave signal based on the frequency band of the external sound wave signal to obtain a sound wave signal in a specified frequency band, thereby reducing interference caused by external sound waves.

[0068] In one embodiment, the functional device includes a stylus.

[0069] By emitting the same external sound wave signal, the received feedback sound wave signals are different when the stylus pen is placed in the functional device placement portion 200, when the stylus pen is not placed in the functional device placement portion 200, or when stylus pens of different sizes are placed in the functional device placement portion 200.

[0070] In one embodiment, if Figure 6 As shown, the identification module 300 includes an identification chip U2, the acquisition module 220 includes a microphone U1, and the sound module 210 includes a power amplifier chip U3. The corresponding pins of the identification chip U2 are connected to the microphone U1 and the power amplifier chip U3 respectively. Microphone U1 is used to obtain feedback sound wave signals and perform analog-to-digital conversion on the feedback sound wave signals. The identification chip U2 can obtain the feedback sound wave signals after analog-to-digital conversion from microphone U1. The power amplifier chip U3 is used to provide a driving signal to the corresponding speaker 211, thereby driving the speaker 211 to emit an outgoing sound wave signal.

[0071] In some embodiments, as Figure 6 As shown, the identification chip U2 can also be connected to the first output terminal AUDIO_INL and the first output terminal AUDIO_INR of the sound wave configuration module through the first pin LINEINL and the second pin LINEINR to obtain the sound wave configuration signal, which is used to provide it to the power amplifier chip U3 to adjust the relevant parameters of the external sound wave signal.

[0072] The sound wave configuration module may be an internal module of the touch screen 10 or an external module connected to a related interface of the touch screen 10 , and this example does not limit it.

[0073] In some embodiments, as Figure 6 As shown, the identification chip U2 can also be connected to the host computer or other main control modules through the communication circuit 400 to upload the placement status of the functional device.

[0074] Figure 7 A flowchart of a method for detecting a functional device provided by an embodiment of the present application is shown. For ease of illustration, only the portion related to this embodiment is shown, which is described in detail as follows:

[0075] The method for detecting a functional device can be applied to the touch screen 10 in any of the above embodiments. The method for detecting a functional device includes steps S100 to S300.

[0076] Step S100: testing the touch screen to obtain a characteristic signal.

[0077] Specifically, the touch screen can be tested under different set conditions to obtain multiple different characteristic signals. These set conditions include: the stylus being placed in the functional device placement portion 200; the stylus not being placed in the functional device placement portion 200; and styluses of different sizes being placed in the functional device placement portion 200. The characteristic signals can include multiple different comparison signals, each corresponding to a set condition.

[0078] Step S200: sending out an external sound wave signal through the touch screen and collecting a feedback sound wave signal.

[0079] The feedback sound wave signal includes the reflected sound wave signal.

[0080] Step S300: Compare the feedback sound wave signal with the characteristic signal to obtain the placement status of the functional device.

[0081] When the feedback sound wave signal is identical to a comparison signal in the characteristic signal, it can be determined that the placement state of the functional device corresponding to the received feedback sound wave signal is identical to the setting condition corresponding to the comparison signal. The placement state of the functional device can then be determined based on the setting condition.

[0082] In one embodiment, if Figure 8 As shown, step S100 includes steps S110 to S130.

[0083] Step S110: When the touch screen is in an idle state, an external sound wave signal is emitted through the touch screen and a feedback sound wave signal is collected, and the collected feedback sound wave signal is set as a first comparison signal.

[0084] Step S120: When a functional device of the first size is placed on the touch screen, an external sound wave signal is emitted through the touch screen and a feedback sound wave signal is collected, and the collected feedback sound wave signal is set as a second comparison signal.

[0085] Step S130: When a functional device of the second size is placed on the touch screen, an external sound wave signal is emitted through the touch screen and a feedback sound wave signal is collected, and the collected feedback sound wave signal is set as a third comparison signal.

[0086] It is understood that the characteristic signal includes the first comparison signal, the second comparison signal, and the third comparison signal. In steps S110 to S130, while the external sound wave signals emitted in each step can be the same, the collected feedback sound wave signals can also be different, thereby obtaining different first comparison signals, second comparison signals, and third comparison signals.

[0087] By comparing the subsequently collected feedback sound wave signal with the first comparison signal, the second comparison signal and the third comparison signal, the placement status of the functional device can be obtained in most cases.

[0088] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0089] The above is only a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present application, several equivalent obvious variations and / or equivalent replacements can be made, and these obvious variations and / or equivalent replacements should also be regarded as within the scope of protection of the present application.

Claims

1. A touch screen, characterized in that: include: Touch display panel; A functional device placement portion, the functional device placement portion being arranged at an edge of the touch display panel and being used to place functional devices; the functional device placement portion is further used to emit an external sound wave signal and collect a feedback sound wave signal, the feedback sound wave signal including the reflected external sound wave signal; An identification module is connected to the functional device placement portion and is used to compare the feedback sound wave signal with the characteristic signal to obtain the placement status of the functional device.

2. The touch screen according to claim 1, wherein: The functional equipment placement part includes a sound generating module and a collection module; The acquisition module is connected to the identification module; The sound emitting module is used to emit the external sound wave signal, and the collecting module is used to collect the feedback sound wave signal.

3. The touch screen according to claim 2, wherein: The sound-generating module includes a plurality of speakers, and the speakers are used to emit the external sound wave signal.

4. The touch screen according to claim 3, wherein: The acquisition module includes a plurality of acoustic wave sensors, and the acoustic wave sensors are used to acquire the feedback acoustic wave signals.

5. The touch screen according to claim 4, wherein: The sound-generating module includes two speakers, and the acquisition module includes two sound wave sensors.

6. The touch screen according to claim 5, characterized in that: The functional device placement portion includes a first end and a second end opposite to each other, wherein one of the speakers and one of the acoustic wave sensors are arranged at the first end of the functional device placement portion, and another of the speakers and another of the acoustic wave sensors are arranged at the second end of the functional device placement portion.

7. The touch screen according to any one of claims 1 to 6, characterized in that: The external sound wave signal includes an ultrasonic wave signal.

8. The touch screen according to claim 7, wherein: The frequency of the external sound wave signal is greater than or equal to 40 kHz.

9. The touch screen according to any one of claims 1 to 6, characterized in that: The functional device includes a stylus.

10. The touch screen according to any one of claims 1 to 6, characterized in that: The touch screen further includes a housing, the touch display panel and the functional device placement portion are both arranged on the housing, and the identification module is arranged inside the housing.

Images