Touch display panel and touch display device

Abstract

An embodiment of the present invention discloses a touch display panel and a touch display device. The touch display panel includes: Each elastic wave detection module includes an elastic wave sensor, an amplification circuit, and a filtering circuit. The output end of the elastic wave sensor is connected to the input end of the amplification circuit, and the output end of the amplification circuit is electrically connected to the input end of the filtering circuit; The amplification factor of the amplification circuit in at least some of the elastic wave detection modules is different from that of the amplification circuit in other elastic wave detection modules, and the passband frequency of the filtering circuit in at least some of the elastic wave detection modules is different from that of the filtering circuit in other elastic wave detection modules; The output end of each elastic wave detection module is electrically connected to the processor, and the processor is configured to receive the elastic wave detection signal output by the elastic wave detection module and determine the type of the object touching the touch display panel according to the elastic wave detection signal. The embodiment of the present invention can improve the detection sensitivity of the elastic wave signal and improve the determination accuracy of the touch object type.

Description

Technical Field

[0001] Embodiments of the present invention relate to display technology, and in particular, to a touch display panel and a touch display device. Background Art

[0002] In a touch display panel with an elastic wave sensor, a touch signal of a touch object is detected by the elastic wave sensor, and the type of the touch object is determined according to the touch signal.

[0003] However, when detecting the type of a touch object in an existing touch display panel, errors are likely to occur, such as failure to detect or distorted detection, which affects the user experience. Summary of the Invention

[0004] The present invention provides a touch display panel and a touch display device to improve the detection accuracy of touch objects.

[0005] In a first aspect, an embodiment of the present invention provides a touch display panel, including:

[0006] a processor and a plurality of elastic wave detection modules;

[0007] Each of the elastic wave detection modules includes an elastic wave sensor, an amplifier circuit, and a filter circuit. The output end of the elastic wave sensor is electrically connected to the input end of the amplifier circuit, and the output end of the amplifier circuit is electrically connected to the input end of the filter circuit;

[0008] The amplification factor of the amplifier circuit in at least some of the elastic wave detection modules is different from that of the amplifier circuit in other elastic wave detection modules, and the passband frequency of the filter circuit in at least some of the elastic wave detection modules is different from that of the filter circuit in other elastic wave detection modules;

[0009] The output end of each elastic wave detection module is electrically connected to the processor, and the processor is configured to receive the elastic wave detection signal output by the elastic wave detection module and determine the type of the object touching the touch display panel according to the elastic wave detection signal.

[0010] Optionally, the elastic wave detection modules include a first elastic wave detection module, a second elastic wave detection module, a third elastic wave detection module, and a fourth elastic wave detection module;

[0011] The amplifier circuit of the first elastic wave detection module has a first amplification factor, and the filter circuit of the first elastic wave detection module has a first passband frequency;

[0012] The amplifier circuit of the second elastic wave detection module has a second amplification factor, and the filter circuit of the second elastic wave detection module has a second passband frequency;

[0013] The amplifier circuit of the third elastic wave detection module has a first amplification factor, and the filter circuit of the third elastic wave detection module has a second passband frequency;

[0014] The amplifier circuit of the fourth elastic wave detection module has a second amplification factor, and the filter circuit of the third elastic wave detection module has a first passband frequency;

[0015] Wherein, the first amplification factor is greater than the second amplification factor, and the first passband frequency is greater than the second passband frequency.

[0016] Optionally, the number of the first elastic wave detection module, the second elastic wave detection module, the third elastic wave detection module, and the fourth elastic wave detection module is the same.

[0017] Optionally, the touch display panel further includes:

[0018] A display screen, which is electrically connected to the processor;

[0019] The processor is configured to adjust the display content of the display screen according to the type of the object.

[0020] Optionally, the processor is configured to erase the display content on the display screen at the position where the object touches according to the type of the object, or to display different content at the position where the object touches on the display screen.

[0021] Optionally, the display screen includes a non-display area, and the elastic wave detection module is disposed in the non-display area of the display screen.

[0022] Optionally, a plurality of the elastic wave detection modules are evenly distributed in the non-display area.

[0023] Optionally, the touch display panel further includes:

[0024] The amplification factors of the amplifier circuits in adjacent elastic wave detection modules are different, and / or the passband frequencies of the filter circuits in adjacent elastic wave detection modules are different.

[0025] Optionally, the display screen is an organic light-emitting display screen, a liquid crystal display screen, or a light-emitting diode display screen.

[0026] In a second aspect, an embodiment of the present invention further provides a touch display device, including the touch display panel according to any embodiment of the present invention.

[0027] In an embodiment of the present invention, by setting the amplification factor of the amplifier circuit in at least some of the elastic wave detection modules to be different from that of the amplifier circuit in other elastic wave detection modules, and setting the passband frequency of the filter circuit in at least some of the elastic wave detection modules to be different from that of the filter circuit in other elastic wave detection modules, the elastic wave detection modules can detect both larger and smaller elastic wave signals, and can detect both higher-frequency and lower-frequency elastic wave signals, thereby improving the detection sensitivity of the elastic wave signals and improving the determination accuracy of the object type touching the touch display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a schematic diagram of a touch display panel provided by an embodiment of the present invention;

[0029] Figure 2 FIG. is a schematic diagram of an elastic wave detection module provided by an embodiment of the present invention;

[0030] Figure 3 FIG. is a schematic diagram of another touch display panel provided by an embodiment of the present invention;

[0031] Figure 4 FIG. is a schematic diagram of another touch display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only some structures related to the present invention are shown in the drawings rather than all structures.

[0033] This embodiment provides a touch display panel. Figure 1 FIG. is a schematic diagram of a touch display panel provided by an embodiment of the present invention. Figure 2 FIG. is a schematic diagram of an elastic wave detection module provided by an embodiment of the present invention. Referring to Figure 1 and Figure 2 , the touch display panel includes:

[0034] A processor 10 and a plurality of elastic wave detection modules 20; each elastic wave detection module 20 includes an elastic wave sensor 21, an amplifier circuit 22, and a filter circuit 23. The output end of the elastic wave sensor 21 is electrically connected to the input end of the amplifier circuit 22, and the output end of the amplifier circuit 22 is electrically connected to the input end of the filter circuit 23.

[0035] The amplification factor of the amplifier circuit 21 in at least part of the elastic wave detection module 20 is different from that of the amplifier circuit 21 in other elastic wave detection modules 20, and the passband frequency of the filter circuit 23 in at least part of the elastic wave detection module 20 is different from that of the filter circuit 23 in other elastic wave detection modules 20.

[0036] The output end of each elastic wave detection module 20 is electrically connected to the processor 10. The processor 10 is configured to receive the elastic wave detection signal output by the elastic wave detection module 20 and determine the type of the object touching the touch display panel according to the elastic wave detection signal.

[0037] Among them, the output end of the elastic wave detection module 20 can be the output end of the filter circuit 23, or when the elastic wave detection module 20 further includes other circuits, the output end of the elastic wave detection module 20 is the output end of the circuit that finally outputs the elastic wave detection signal. The processor 10 can be the driving chip of the touch display panel, which is used to drive the touch display panel to display images. When an object touches the touch display panel, the touch of the object will generate elastic waves on the touch display panel. Different touch forces and different types of objects will generate elastic waves with different magnitudes and frequencies.

[0038] If the amplification factors of the amplifier circuits 21 in all the elastic wave detection modules 20 are the same, when the touch force is large, the elastic wave signal is too large, resulting in distortion problems for almost all the signals collected by the elastic wave detection modules 20 after amplification, which affects the spectrum analysis. On the contrary, when the touch force is small, the elastic wave signal is too small, which will cause almost all the elastic wave detection modules 20 to have too low signal-to-noise ratio or fail to detect the elastic wave signal, which is also not conducive to analysis. By setting the amplification factor of the amplifier circuit 21 in at least part of the elastic wave detection module 20 to be different from that of the amplifier circuit 21 in other elastic wave detection modules 20, both larger and smaller elastic wave signals can be detected, improving the detection sensitivity of the elastic wave signal and the determination accuracy of the object type.

[0039] In addition, if the filtering frequencies of the filtering circuits 23 in all the elastic wave detection modules 20 are the same, it may occur that when an object touches the touch display panel at a relatively high frequency, the frequency of the elastic wave signal is large, and the filtering circuit 23 filters out the elastic wave signal with a relatively high frequency. Or, it may occur that when an object touches the touch display panel at a relatively low frequency, the frequency of the elastic wave signal is small, and the filtering circuit 23 filters out the touch signal with a relatively low frequency. Both of these situations are not conducive to the detection of the touched object. By setting the passband frequencies of the filtering circuits 23 in at least some of the elastic wave detection modules 20 to be different from the passband frequencies of the filtering circuits 23 in other elastic wave detection modules 20, the elastic wave detection modules can detect both relatively high-frequency elastic wave signals and relatively low-frequency elastic wave signals, improving the detection sensitivity of the elastic wave signals and the determination accuracy of the object type.

[0040] In this embodiment, by setting the amplification multiples of the amplification circuits 21 in at least some of the elastic wave detection modules 20 to be different from the amplification multiples of the amplification circuits 21 in other elastic wave detection modules 20, and setting the passband frequencies of the filtering circuits 23 in at least some of the elastic wave detection modules 20 to be different from the passband frequencies of the filtering circuits 23 in other elastic wave detection modules 20, the elastic wave detection modules 20 can detect both relatively large elastic wave signals and relatively small elastic wave signals, and the elastic wave detection modules 20 can detect both relatively high-frequency elastic wave signals and relatively low-frequency elastic wave signals, improving the detection sensitivity of the elastic wave signals and the determination accuracy of the object type touching the touch display panel.

[0041] Figure 3 is a schematic diagram of another touch display panel provided by an embodiment of the present invention. Optionally, referring to Figure 3 , the elastic wave detection module includes a first elastic wave detection module 201, a second elastic wave detection module 202, a third elastic wave detection module 203, and a fourth elastic wave detection module 204;

[0042] The amplification circuit 21 of the first elastic wave detection module 201 has a first amplification multiple, and the filtering circuit 23 of the first elastic wave detection module 201 has a first passband frequency;

[0043] The amplification circuit 21 of the second elastic wave detection module 202 has a second amplification multiple, and the filtering circuit 23 of the second elastic wave detection module 202 has a second passband frequency;

[0044] The amplification circuit 21 of the third elastic wave detection module 203 has a first amplification multiple, and the filtering circuit 22 of the third elastic wave detection module 203 has a second passband frequency;

[0045] The amplification circuit 21 of the fourth elastic wave detection module 204 has a second amplification multiple, and the filtering circuit 23 of the third elastic wave detection module 204 has a first passband frequency;

[0046] Among them, the first magnification factor is greater than the second magnification factor, and the first passband frequency is greater than the second passband frequency.

[0047] Specifically, the first elastic wave detection module 201 is used to detect high-frequency and relatively strong touches, the second elastic wave detection module 202 is used to detect low-frequency and relatively weak touches, the third elastic wave detection module 203 is used to detect low-frequency and relatively strong touches, and the fourth elastic wave detection module is used to detect high-frequency and relatively weak touches. By setting four elastic wave detection modules with different magnification factors and passband frequencies, namely the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204, it is possible to better detect elastic waves for both strong and weak touches, and for both high-frequency and low-frequency touches, so as to determine the type of the object touching the touch display panel.

[0048] It should be noted that Figure 3 only an exemplary case where the number of the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204 is one is shown, which is not a limitation of the present invention. In other embodiments, the number of the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204 can be set as needed.

[0049] Optionally, the number of the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204 is the same.

[0050] With such a setting, the touch display panel has similar detection capabilities for each type of elastic wave signal, so that the detection accuracy of each type of elastic wave signal is relatively high, and the objects touching the touch display screen can be accurately detected, improving the detection accuracy.

[0051] It should be noted that only an exemplary case where the number of the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204 is the same is shown in this embodiment, which is not a limitation of the present invention. In other embodiments, the number of the four different elastic wave detection modules can be determined according to the occurrence frequency of different elastic wave signals. For example, when the occurrence frequency of low-frequency elastic wave signals is relatively high, the number of the second elastic wave detection module 202 and the third elastic wave detection module 203 can be set to be relatively large.

[0052] Figure 4 It is a schematic diagram of another touch display panel provided by an embodiment of the present invention. Optionally, refer to Figure 4, the touch display panel further includes:

[0053] a display screen 30, and the display screen 30 is electrically connected to the processor 10;

[0054] The processor 10 is configured to adjust the display content of the display screen 30 according to the type of the object.

[0055] Specifically, the display screen is an organic light-emitting display screen, a liquid crystal display screen, or a light-emitting diode display screen. The type of the object may include a finger, a touch pen with different thicknesses, and a touch pen with different materials, etc. The processor 10 may determine the type of the object touching the display screen 30 according to different elastic wave signals. According to the type of the object, the display screen 30 at the object touch position may display a corresponding color or a line with a corresponding thickness, or the content on the display screen 30 at the object touch position may be erased, etc.

[0056] Optionally, the processor is configured to erase the display content on the display screen 30 at the object touch position according to the type of the object, or to display different content at the object touch position on the display screen 30.

[0057] Exemplarily, when it is detected that the object is a finger or the like, the content on the display screen 30 at the finger touch position may be controlled to be erased to implement the function of an eraser. When it is detected that the object is a pen with different materials, different colored lines may be controlled to be displayed at the pen touch position, or when it is detected that the object is a pen with different thicknesses, lines with different thicknesses may be controlled to be displayed at the pen touch position.

[0058] Optionally, the display screen 30 includes a non-display area 31, and the elastic wave detection module is disposed in the non-display area 31 of the display screen 30.

[0059] Specifically, by disposing the elastic wave detection module in the non-display area 31, the elastic wave detection module is prevented from affecting the display picture of the display screen 30, and the display driving circuit and the like in the display area of the display screen 30 can be prevented from interfering with the elastic wave detection module, thereby improving the object detection accuracy.

[0060] Optionally, a plurality of elastic wave detection modules are uniformly distributed in the non-display area 31. With such a setting, when an object touches the display screen, elastic wave signals can be detected at each position in the non-display area 31. The elastic waves at each position can more accurately reflect the type of the object when combined, and the type of the object can be more accurately determined by analyzing the elastic waves.

[0061] Exemplarily, referring to Figure 4 , the non-display area 31 surrounds the display area 32, and the first elastic wave detection module 201, the second elastic wave detection module 202, the third elastic wave detection module 203, and the fourth elastic wave detection module 204 are uniformly distributed in the non-display area 31.

[0062] Optionally, the amplification factors of the amplifier circuits in adjacent elastic wave detection modules are different, and / or the passband frequencies of the filter circuits in adjacent elastic wave detection modules are different.

[0063] With such a setting, elastic wave detection modules with two different amplification factors are provided at positions close to each other, or elastic wave detection modules with two different passband frequencies are provided at positions close to each other, so that elastic wave signals of different types can be detected at each position, avoiding signal omission and thus improving the detection accuracy.

[0064] An embodiment of the present invention further provides a touch display device, which includes the touch display panel according to any embodiment of the present invention. The touch display device can be an electronic display product such as a tablet.

[0065] Note that the above are only the preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A touch display panel, characterized in that, comprising: a processor and a plurality of elastic wave detection modules; Each of the elastic wave detection modules includes an elastic wave sensor, an amplification circuit, and a filtering circuit. The output end of the elastic wave sensor is electrically connected to the input end of the amplification circuit, and the output end of the amplification circuit is electrically connected to the input end of the filtering circuit; The amplification factor of the amplification circuit in at least some of the elastic wave detection modules is different from that of the amplification circuit in other elastic wave detection modules, and the passband frequency of the filtering circuit in at least some of the elastic wave detection modules is different from that of the filtering circuit in other elastic wave detection modules; The output end of each elastic wave detection module is electrically connected to the processor, and the processor is configured to receive the elastic wave detection signal output by the elastic wave detection module and determine the type of the object touching the touch display panel according to the elastic wave detection signal; The elastic wave detection module includes a first elastic wave detection module, a second elastic wave detection module, a third elastic wave detection module, and a fourth elastic wave detection module; The amplification circuit of the first elastic wave detection module has a first amplification factor, and the filtering circuit of the first elastic wave detection module has a first passband frequency; The amplification circuit of the second elastic wave detection module has a second amplification factor, and the filtering circuit of the second elastic wave detection module has a second passband frequency; The amplification circuit of the third elastic wave detection module has a first amplification factor, and the filtering circuit of the third elastic wave detection module has a second passband frequency; The amplification circuit of the fourth elastic wave detection module has a second amplification factor, and the filtering circuit of the third elastic wave detection module has a first passband frequency; Wherein, the first amplification factor is greater than the second amplification factor, and the first passband frequency is greater than the second passband frequency; The amplification factor of the amplification circuit in adjacent elastic wave detection modules is different, or the passband frequency of the filtering circuit in adjacent elastic wave detection modules is different.

2. The touch display panel according to claim 1, characterized in that: The number of the first elastic wave detection module, the second elastic wave detection module, the third elastic wave detection module, and the fourth elastic wave detection module is the same.

3. The touch display panel according to claim 1, characterized in that , further comprising: a display screen, the display screen is electrically connected to the processor; The processor is configured to adjust the display content of the display screen according to the type of the object.

4. The touch display panel according to claim 3, characterized in that: The processor is configured to erase the display content on the display screen at the object touch position according to the type of the object, or to display different content on the display screen at the object touch position.

5. The touch display panel according to claim 3, characterized in that: The display screen includes a non-display area, and the elastic wave detection module is disposed in the non-display area of the display screen.

6. The touch display panel according to claim 5, characterized in that: A plurality of the elastic wave detection modules are evenly distributed in the non-display area.

7. The touch display panel according to claim 3, wherein: the display screen is an organic light-emitting display screen, a liquid crystal display screen or a light-emitting diode display screen.

8. A touch display device, characterized in that it includes the touch display panel according to any one of claims 1-7.

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