Display equipment virtual key based on temperature identification and piezoelectric feedback

Abstract

The invention belongs to the technical field of electronic equipment equipped with display screens, and particularly relates to a display equipment virtual key based on temperature identification and piezoelectric feedback, which comprises a middle frame integrated with a display screen, and a sheet-shaped thermistor and a piezoelectric actuator are integrally attached and fixedly arranged on the back surface of the middle frame; the thermistor is used for sensing the touch temperature of the front face of the middle frame and generating an action current signal to the displayer internal processor, the displayer internal processor applies pulse voltage to the piezoelectric actuator, and the piezoelectric actuator is bent and deformed and generates feedback vibration acting force. The key position touch control structure of the display is designed on the basis of the thermistor, the piezoelectric actuator and the like on the whole, so that the integrated design with the middle frame is realized while the conventional functions are met, and the reliability level of the product and the use experience of a user are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic devices equipped with display screens, and in particular relates to a display device virtual key based on temperature recognition and piezoelectric feedback. Background Art

[0002] With the popularization of new electronic devices such as smart displays, smart monitors, and tablets, users' experience demands for electronic products have gradually upgraded, from meeting basic usage needs to pursuing experiences at multiple sensory levels such as sight, hearing, and touch, which has put forward new demands on the design of electronic products.

[0003] In traditional solutions, the power button or volume button of the display screen is mostly fixed to the assembly frame in the form of a component. Here, the power button and volume button are collectively referred to as display buttons, such as Figure 1 As shown, the display button cooperates with the middle frame A and the middle frame B of the assembly frame and the touch switch. When the finger presses the button, it will stimulate the touch switch to generate a changing current signal. The internal processor of the display sends a control instruction after receiving the current signal. The display module of the internal processor of the display shows that the display screen turns on and off, the volume changes, etc. On the other hand, the structure of the traditional solution can provide a reaction force to remind the user that this pressing action has taken effect.

[0004] However, the traditional solution has the following defects:

[0005] 1. The display buttons are separated from the assembly frame and based on the mechanical structure, which affects the appearance and product reliability;

[0006] 2. The display buttons and assembly frame are nested, which increases the difficulty of stacking design and assembly. Furthermore, when the product needs to be waterproof and dustproof, additional design is required for the side buttons, such as adding waterproof gaskets, which increases the difficulty of stacking design;

[0007] 3. Feedback force is generated based on the protruding spring under the button to remind the user that the button has an effect. In actual use, due to the circuit of the device, there may be a situation where no current changes after pressing, resulting in the user feeling the feedback force reminder, but the button actually has no effect, that is, the coupling between the mechanical system and the circuit system is disconnected, and the feedback mechanism fails.

[0008] Therefore, the present invention proposes an integrated design scheme that can realize a display panel and hard operation buttons, that is, the display panel can be assembled without mechanical combination with components such as buttons, so as to realize an integrated design and optimize the appearance experience. Summary of the invention

[0009] The present invention provides a display device virtual key based on temperature recognition and piezoelectric feedback, comprising a middle frame integrated with a display screen, wherein a sheet-shaped thermistor and a piezoelectric actuator are integrally mounted on the back of the middle frame; the thermistor is used to sense the touch temperature of the front of the middle frame and generate an action current signal to an internal processor of the display, and the internal processor of the display applies a pulse voltage to the piezoelectric actuator, and the piezoelectric actuator bends and deforms and generates a feedback vibration force.

[0010] Furthermore, the piezoelectric actuator includes an integrated passive layer and a piezoelectric material layer, the piezoelectric material layer is provided with positive and negative electrodes that receive pulse voltage and bend and deform, and the piezoelectric material layer generates bending vibration under the restriction of the passive layer.

[0011] Furthermore, the material of the piezoelectric material layer is a 1-3 type piezoelectric composite material; a positive and negative electrode is provided in the Z direction at one end of the piezoelectric material layer; after a voltage is applied in the Z direction of the piezoelectric material layer, a dimensional deformation of elongation or shortening occurs in the X direction and bending vibration is generated through the limiting effect of the passive layer.

[0012] Furthermore, a strip-shaped blind hole is provided on the back side of the middle frame; the thermistor and the piezoelectric actuator are both located in the blind hole.

[0013] Furthermore, a groove matching the position of the thermistor is provided at the bottom of the blind hole; one side of the thermistor is embedded in the groove, and the thermistor is fixed to the middle frame by means of adhesive tape.

[0014] Furthermore, the piezoelectric actuator is bonded to the middle frame by glue.

[0015] Furthermore, the piezoelectric actuator is provided with a through hole; the thermistor is placed in the through hole; and the width of the blind hole matches the width of the piezoelectric actuator.

[0016] Furthermore, the time for the thermistor to sense the touch temperature is t; when t<10ms, the internal processor of the display determines it as a false touch; when 10ms≤t<0.5s, the internal processor of the display controls the display to turn on and off, and transmits a short-time pulse voltage signal to the piezoelectric material layer, and the piezoelectric actuator generates a short vibration; when t≥0.5s, the internal processor of the display controls the display to turn on and off, and transmits a long-time pulse voltage signal to the piezoelectric material layer, and the piezoelectric actuator generates a long vibration.

[0017] Furthermore, the number of thermistors and piezoelectric actuators is the same and is multiple; the thermistors and piezoelectric actuators are alternately mounted on the middle frame in sequence.

[0018] Furthermore, the piezoelectric actuator is rectangular in shape.

[0019] The beneficial effects brought by the present invention are as follows:

[0020] 1. Optimize product appearance and improve user experience. The present invention can realize the integrated design of display screen, thermistor, piezoelectric vibrator and middle frame, optimize product appearance and improve user experience;

[0021] 2. Optimize stacking design. By using thermistors and piezoelectric actuators to replace traditional mechanical buttons, the internal stacking space of the display can be saved and the structural design cost can be reduced;

[0022] 3. Improve product reliability. The thermistor receives user touch information, and the piezoelectric actuator provides feedback force. Compared with the traditional mechanical structure, it is easier to assemble and has better reliability in dealing with drop, static pressure, vibration and salt spray tests;

[0023] 4. Simplify the waterproof and dustproof design. When the overall waterproof and dustproof requirements are high, since the middle frame does not cooperate with other components of the display, there is no gap between them and no additional waterproof and dustproof design is required.

[0024] 5. The feedback force reminder mechanism is more robust and the system responds faster. After pressing the thermistor, the internal processor of the display will issue a command to apply voltage to both ends of the piezoelectric actuator, and the piezoelectric actuator will deform to generate actuating force. Compared with traditional buttons, there is no problem of disconnection between the mechanical system and the electronic system, which will cause the feedback mechanism to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the traditional button design structure.

[0026] Figure 2 A schematic diagram of a virtual key structure of a display device provided by the present invention is shown.

[0027] Figure 3 A structural diagram of a power key embodiment provided by the present invention is shown.

[0028] Figure 4 express Figure 2 Schematic diagram of the structural principle of the medium-pressure electric actuator.

[0029] Figure 5 express Figure 3 The trigger flow chart of the power button.

[0030] Figure 6 A structural diagram of a volume key embodiment provided by the present invention is shown.

[0031] In the figure, 1, middle frame; 2, thermistor; 3, piezoelectric actuator; 31, passive layer; 32, piezoelectric material layer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example

[0034] like Figures 2 to 4 As shown, the present invention provides a display device virtual key based on temperature recognition and piezoelectric feedback, including a middle frame 1 integrated with a display screen, and a sheet-shaped thermistor 2 and a piezoelectric actuator 3 are integrally mounted on the back of the middle frame 1; the thermistor 2 is used to sense the touch temperature on the front of the middle frame 1 and generate an action current signal to the internal processor of the display, and the internal processor of the display applies a pulse voltage to the piezoelectric actuator 3, and the piezoelectric actuator 3 bends and deforms and generates feedback vibration force. In this way, the stacking design of traditional keys can be optimized, that is, the thermistor 2 and the piezoelectric actuator 3 are used to replace the traditional mechanical keys and are integrated with the middle frame 1, which can save the stacking space inside the display and reduce the cost of structural design.

[0035] When in use, the finger touches and presses the display screen, and after the thermistor 2 takes effect, the processor inside the display will issue a command to apply voltage to both ends of the piezoelectric actuator 3, and the piezoelectric actuator 3 will deform to generate actuating force. Compared with traditional buttons, there is no problem of disconnection between the mechanical system and the electronic system, which leads to failure of the feedback mechanism; at the same time, the overall structure is simple, and the appearance experience is optimized.

[0036] Specifically, the piezoelectric actuator 3 includes an integrated passive layer 31 and a piezoelectric material layer 32 . The piezoelectric material layer 32 is provided with positive and negative electrodes that are bent and deformed by receiving a pulse voltage. The piezoelectric material layer 32 generates bending vibrations under the restriction of the passive layer 31 .

[0037] The passive layer 31 here is a soft material without electrodes; the piezoelectric material layer 32 is an existing piezoelectric material, that is, a type of functional material with piezoelectric effect. The piezoelectric effect refers to the effect that a material generates an electrical signal under pressure; or the phenomenon that a material undergoes mechanical deformation under the action of an electric field, which will not be described in detail. The passive layer 31 and the piezoelectric material layer 32 can be bonded together with glue to form a piezoelectric actuator 3.

[0038] The material of the above-mentioned piezoelectric material layer 32 is preferably 1-3 type piezoelectric composite material; when in use, positive and negative electrodes are provided in the Z direction at one end of the piezoelectric material layer 32; after voltage is applied in the Z direction of the piezoelectric material layer 32, dimensional deformation of elongation or contraction occurs in the X direction and bending vibration is generated through the limiting effect of the passive layer 31.

[0039] In addition, a strip-shaped blind hole is provided on the back of the middle frame 1; the thermistor 2 and the piezoelectric actuator 3 are both located in the blind hole, which is used for mounting and limiting the thermistor 2 and the piezoelectric actuator 3, and further improves the overall integrated appearance to ensure the user's experience needs. The shape of the piezoelectric actuator 3 is preferably rectangular, and the blind hole is waist-shaped and has a length greater than the length of the piezoelectric actuator 3, which will not be described in detail.

[0040] When the device has high requirements for waterproof and dustproof, since the middle frame 1 does not cooperate with other components of the display and there is no matching gap, there is no need for additional waterproof and dustproof design, and the overall waterproof and dustproof design can be simplified.

[0041] As an embodiment of the present invention, for the power button, Figure 3 As shown, based on the above-mentioned display device virtual key, a groove matching the position of the thermistor 2 is provided at the bottom of the blind hole; one side of the thermistor 2 is embedded in the groove, and the thermistor 2 is fixed to the middle frame 1 by tape; and the piezoelectric actuator 3 is preferably bonded to the middle frame 1 by glue.

[0042] Here, the piezoelectric actuator 3 may be provided with a through hole; the thermistor 2 is placed in the through hole; the width of the blind hole matches the width of the piezoelectric actuator 3. The shapes of the thermistor 2 and the through hole are preferably matching waist hole shapes.

[0043] When in use, when the user presses the middle frame 1 at the power button position, the thermistor 2 senses the touch information and generates a resistance change. The internal processor of the display receives the signal, obtains the user's touch information and sends instructions to the display module and function module integrated in the processor of the display to achieve corresponding control. At the same time, the piezoelectric actuator 3 is triggered according to the situation to feedback to the user that the touch has taken effect and realize the user's needs such as turning the screen on and off. The specific process is as follows Figure 5As shown, a finger touches the position corresponding to the thermistor 2, and the time for the thermistor 2 to sense the touch temperature is set to t; when t < 10ms, the internal processor of the display determines it as a false touch; when 10ms ≤ t < 0.5s, the internal processor of the display controls the display to turn on and off, and transmits a short-time pulse voltage signal to the piezoelectric material layer 32, and the piezoelectric actuator 3 generates a short vibration; when t ≥ 0.5s, the internal processor of the display controls the display to turn on and off, and transmits a long-time pulse voltage signal to the piezoelectric material layer 32, and the piezoelectric actuator 3 generates a long vibration. Compared with the traditional mechanical structure, it is more convenient to assemble, and has better reliability when dealing with drop, static pressure, vibration and salt spray tests.

[0044] As an embodiment of the present invention, for the power button, Figure 6 As shown, based on the above-mentioned display device virtual key, the number of thermistors 2 and piezoelectric actuators 3 is the same and is several; the thermistors 2 and piezoelectric actuators 3 are alternately mounted on the middle frame 1 in sequence.

[0045] For example, the number of thermistors 2 and piezoelectric actuators 3 is selected to be five, where thermistors 2 are numbered A5, A4, A3, A2, A1 from top to bottom, and piezoelectric actuators 3 are numbered B5, B4, B3, B2, B1 from top to bottom. When in use, the user can change the resistance of thermistor 2 in sequence by sliding up, sliding down or single-point touch operation. After the internal processor of the display receives the resistance change information and sequence, it realizes the volume increase and decrease operation, and feedbacks to the user through the piezoelectric actuator 3 that the touch has taken effect, and realizes the user's volume adjustment and other needs. The details are as follows:

[0046] 1) Decrease the volume. Figure 6 When sliding a finger from a large number to a small number along the thermistor 2, such as sliding a finger from thermistor 2 from number A5 to number A3, the internal processor of the display receives the resistance change information from number A5 to number A3, controls the volume to decrease from 100% to 60%, and sequentially stimulates number B5 to number B3 of the piezoelectric actuator 3 to provide feedback reminders;

[0047] 2) Increase the volume. Figure 6 When sliding a finger from a small number to a large number on the thermistor 3 along the middle edge, such as sliding a finger from the thermistor 2 from number A3 to number A5, the internal processor of the display receives the resistance change information from number A3 to number A5, controls the volume to increase from 600% to 100%, and sequentially stimulates number B3 to number B5 of the piezoelectric actuator 3 to provide feedback reminders;

[0048] 3) Single-point selection of display volume. The user touches a certain volume area to change the resistance of thermistor 2 at the corresponding position, such as thermistor 2 numbered A3. The internal processor of the display receives the resistance change information of numbered A3, controls the volume change to 60%, and stimulates numbered B3 of piezoelectric actuator 3 for feedback reminder.

[0049] In summary, the present invention realizes the user's touch requirements for the power button and the volume button by designing the thermistor 2 and the piezoelectric actuator 3, and at the same time realizes the integrated design of the display screen and the middle frame 1, optimizes the appearance, reliability, waterproof and other performance, and improves the user experience.

[0050] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A display device virtual key based on temperature recognition and piezoelectric feedback, comprising a middle frame (1) integrated with a display screen, characterized in that: A sheet-shaped thermistor (2) and a piezoelectric actuator (3) are integrally mounted on the back of the middle frame (1); the thermistor (2) is used to sense the touch temperature of the front of the middle frame (1) and generate an action current signal to an internal processor of the display; the internal processor of the display applies a pulse voltage to the piezoelectric actuator (3), and the piezoelectric actuator (3) bends and deforms and generates a feedback vibration force.

2. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 1, characterized in that: The piezoelectric actuator (3) comprises an integrated passive layer (31) and a piezoelectric material layer (32); the piezoelectric material layer (32) is provided with positive and negative electrodes that are bent and deformed by receiving a pulse voltage; and the piezoelectric material layer (32) generates bending vibration under the limiting effect of the passive layer (31).

3. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 2, characterized in that: The material of the piezoelectric material layer (32) is a 1-3 type piezoelectric composite material; a positive and negative electrode is provided in the Z direction at one end of the piezoelectric material layer (32); after a voltage is applied in the Z direction of the piezoelectric material layer (32), a dimensional deformation of elongation or contraction is generated in the X direction, and bending vibration is generated through the limiting effect of the passive layer (31).

4. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 3, characterized in that: A strip-shaped blind hole is provided on the back of the middle frame (1); the thermistor (2) and the piezoelectric actuator (3) are both located in the blind hole.

5. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 4, characterized in that: A groove matching the position of the thermistor (2) is provided at the bottom of the blind hole; one side of the thermistor (2) is embedded in the groove, and the thermistor (2) is fixed to the middle frame (1) by means of adhesive tape.

6. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 5, characterized in that: The piezoelectric actuator (3) is bonded to the middle frame (1) by glue.

7. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 6, characterized in that: The piezoelectric actuator (3) is provided with a through hole; the thermistor (2) is placed in the through hole; and the width of the blind hole matches the width of the piezoelectric actuator (3).

8. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 7, characterized in that: The time for the thermistor (2) to sense the touch temperature is t; when t < 10 ms, the processor inside the display determines that it is a false touch; when 10 ms ≤ t < 0.5 s, the processor inside the display controls the display to turn on and off, and transmits a short-time pulse voltage signal to the piezoelectric material layer (32), and the piezoelectric actuator (3) generates a short vibration; when t ≥ 0.5 s, the processor inside the display controls the display to turn on and off, and transmits a long-time pulse voltage signal to the piezoelectric material layer (32), and the piezoelectric actuator (3) generates a long vibration.

9. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 6, characterized in that: The number of thermistors (2) and piezoelectric actuators (3) is the same and is a plurality; the thermistors (2) and piezoelectric actuators (3) are alternately mounted on the middle frame (1) in sequence.

10. The display device virtual key based on temperature recognition and piezoelectric feedback according to claim 7, characterized in that: The piezoelectric actuator (3) is in the shape of a rectangle.

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