Computer touchpad capable of being pressed in multiple areas

Abstract

The invention discloses a computer touchpad capable of being pressed in multiple areas, and relates to the technical field of computer input equipment, the computer touchpad comprises a base layer made of magnesium-aluminum alloy, a feedback execution layer is arranged on the base layer, a pressure sensing layer is further arranged on the base layer in a covering mode, a dynamic electrode layer is arranged on the pressure sensing layer in a covering mode, and the dynamic electrode layer is arranged on the base layer in a covering mode. The dynamic electrode layer is covered with a surface interaction layer. According to the computer touchpad capable of being pressed in multiple areas, a honeycomb substrate and double-layer heterogeneous sensor architecture is adopted, the honeycomb substrate is integrated with a piezoelectric ceramic piece array and a graphene heating piece, cross validation of capacitive and piezoresistive sensors is combined, the problem of mistaken touch is solved, the mistaken touch rate is reduced to 1.5%, the structural strength is improved, and based on a dynamic electrode layer and an FPGA controller, the reliability of the computer touchpad is improved. Real-time reconstruction of partition shapes and sensitivity is achieved, the driving voltage can be adjusted within the range of-3V to + 7V, and one-key switching of multiple scenes such as text / game / design is supported.

Description

Technical Field

[0001] The present invention relates to the technical field of computer input devices, and more particularly to a computer touchpad capable of multi-region pressing. Background Art

[0002] In recent years, with the rapid development of human-computer interaction technology, the touchpad, as the core input device of devices such as laptop computers and graphics workstations, has seen continuous improvement in its functional complexity and performance requirements. However, existing touchpad technologies still have significant deficiencies in multi-region pressure sensing, dynamic partition control, and multi-modal feedback, as follows:

[0003] The fixed physical partition results in a rigid layout, unable to dynamically adapt to different application scenarios, with insufficient space utilization; the feedback mechanism is single, relying only on global vibration, lacking local tactile cues and temperature feedback; the single-layer piezoresistive sensor has a high false touch rate and is difficult to distinguish between valid operations and palm false touches. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a computer touchpad capable of multi-region pressing, which solves the problems of the traditional computer touchpad with fixed partition functions, single feedback mechanism, and high false touch rate.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A computer touchpad capable of multi-region pressing, including a base layer made of magnesium alloy, a feedback execution layer is provided on the base layer, and a pressure sensing layer is also covered on the base layer. A dynamic electrode layer is covered on the pressure sensing layer, and a surface interaction layer is covered on the dynamic electrode layer.

[0006] The feedback execution layer includes a honeycomb unit structure arranged in an array on the surface of the base layer. A circular assembly hole is provided at the center of each honeycomb unit structure. Six piezoelectric ceramic sheets are arrayed and embedded in the circular assembly hole to form a feedback group, and a graphene heating sheet is covered on the piezoelectric ceramic sheet.

[0007] The pressure sensing layer includes a capacitive sensor array layer, and a piezoresistive film is covered on the capacitive sensor array layer. The capacitive sensor array layer contains 576 detection units, and each detection unit adopts a concentric double-ring electrode design. The piezoresistive film is arranged in a 5×8 matrix and is offset by 0.5 mm from the vertices of the honeycomb units on the base layer.

[0008] Preferably, the dynamic electrode layer is ITO conductive glass covered on the pressure sensing layer, with a thickness of 0.7 mm, a sheet resistance ≤ 15 Ω / □, and is divided into 32 columns × 18 rows of independently controlled electrode units. Each unit is connected to an FPGA controller through an NMOS transistor.

[0009] Preferably, the surface interaction layer is chemically strengthened glass with a thickness of 0.55 mm. A hexagonal pyramid micro-pit array is laser-etched on the lower surface. The bottom diameter of the micro-pits is 50 ± 10 μm, the ratio of the depth to the bottom diameter is 1:2 ± 0.2, and a silica gel layer containing nano-titanium dioxide is coated on the surface.

[0010] Preferably, the circular assembly holes are formed by a micron-level stamping die. A 5-μm nickel layer is electroplated on the inner wall of the circular assembly holes, the contact resistance is ≤ 0.05 Ω, the surface roughness Ra of the wall surface of the honeycomb unit is ≤ 0.8 μm, and a 24-pin FPC flexible circuit interface is integrated at the edge of the base layer, with a pin pitch of 0.4 mm and an impedance matching tolerance of ≤ ±3%.

[0011] Preferably, the driving signal of the piezoelectric ceramic sheet includes a sine wave with a frequency of 120 Hz ± 10%, a pulse width of 8 ms ± 2, and a peak voltage of 24 V. The temperature control logic of the graphene heating sheet is as follows: when the pressure value > 4 N, it heats up to 42 °C ± 1 °C at a rate of 3 °C / s, and the overshoot is < 0.3 °C.

[0012] Preferably, the electrode pitch of the capacitive sensor array layer is 3.0 mm, the sensitivity range of the piezoresistive film is 0.1 - 10 N, and the linearity error is ≤ ±2%.

[0013] Preferably, the FPGA controller pre-stores at least 5 electrode partition templates, including:

[0014] Text editing mode: The driving voltage of the electrodes in the central area is increased to +7 V;

[0015] Game mode: The sensitivity of the electrodes in the four corner areas is increased by 40%.

[0016] Preferably, the silica gel coating contains 5% - 8% nano-titanium dioxide particles, the antibacterial rate is ≥ 99.7%, and the light transmittance is ≥ 92%.

[0017] Preferably, conductive silver glue with a silver content of 72% ± 3% is injected into the circular assembly holes, the piezoelectric ceramic sheet is positioned by vacuum adsorption, the capacitive sensor array layer forms a double-ring electrode pattern on the polyimide film through a nanoimprint process, the positioning accuracy is ≤ ±20 μm, and 128 gold wires with a diameter of 25 μm are connected between the ITO conductive glass and the FPGA controller by an ultrasonic welding process.

[0018] Preferably, in the graphic design software of the multi-region pressable computer touchpad, a pressure-sensitive drawing area is generated in the left half area, the heating sheet is kept at a constant temperature of 40 °C ± 0.5 °C, a parameter adjustment knob is generated in the right half area, and the tactile feedback simulates the 60-segment scale feeling of a physical knob.

[0019] The present invention provides a multi-region pressable computer touchpad, which has the following beneficial effects compared with the prior art:

[0020] 1. The computer touchpad with multi - area pressing adopts a honeycomb substrate + double - layer heterogeneous sensor architecture. The honeycomb substrate integrates a piezoelectric ceramic sheet array and a graphene heating sheet, and combines the cross - verification of capacitive and piezoresistive sensors to solve the problem of accidental touch. The accidental touch rate is reduced to 1.5%, and the structural strength is improved.

[0021] 2. The computer touchpad with multi - area pressing, based on a dynamic electrode layer and an FPGA controller, realizes real - time reconstruction of the partition shape and sensitivity. The adjustable range of the driving voltage is - 3V to + 7V, and it supports one - key switching in multiple scenarios such as text / games / design.

[0022] 3. The computer touchpad with multi - area pressing integrates pressure - tactile - temperature triple - mode feedback. The piezoelectric ceramic simulates the 60 - segment scale feeling of a physical knob, and the graphene heating sheet realizes precise temperature control at 42°C, and the interactive immersion is increased by 45%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is an exploded schematic diagram of the structure of the present invention;

[0024] Figure 2 is a schematic diagram of the structure of the feedback execution layer of the present invention;

[0025] Figure 3 is an installation schematic diagram of the piezoelectric ceramic sheet structure of the present invention;

[0026] Figure 4 is a schematic diagram of the structure of the pressure sensing layer of the present invention.

[0027] In the figure: 1. Base layer; 2. Feedback execution layer; 21. Honeycomb unit; 22. Circular assembly hole; 23. Piezoelectric ceramic sheet; 24. Graphene heating sheet; 3. Pressure sensing layer; 31. Capacitive sensor array layer; 32. Piezoresistive film; 4. Dynamic electrode layer; 5. Surface interaction layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 4, the present invention provides a technical solution: a computer touchpad that can be pressed in multiple areas, including a base layer 1 made of magnesium alloy, using an AZ31B magnesium alloy plate with a thickness of 1.2 mm. A feedback execution layer 2 is provided on the base layer 1, and a pressure sensing layer 3 is also covered on the base layer 1. A dynamic electrode layer 4 is covered on the pressure sensing layer 3, and a surface interaction layer 5 is covered on the dynamic electrode layer 4.

[0030] The feedback execution layer 2 includes a honeycomb unit 21 structure arranged in an array on the surface of the base layer 1. The honeycomb structure is formed by a micron-level stamping die. The unit parameters are: side length 2.0 mm, wall thickness 0.3 mm, height 0.5 mm. A circular assembly hole 22 is provided at the center of each honeycomb unit 21 structure. Six piezoelectric ceramic chips 23 are arrayed and embedded in the circular assembly hole 22 to form a feedback group, and a graphene heating sheet 24 is covered on the piezoelectric ceramic chips 23.

[0031] The pressure sensing layer 3 includes a capacitive sensor array layer 31. A piezoresistive film 32 is covered on the capacitive sensor array layer 31. The capacitive sensor array layer 31 contains 576 detection units. Each detection unit adopts a concentric double-ring electrode design. The piezoresistive film 32 is arranged in a 5×8 matrix and is offset by 0.5 mm from the vertices of the honeycomb units 21 on the base layer 1.

[0032] Furthermore, the dynamic electrode layer 4 is ITO conductive glass covered on the pressure sensing layer 3, with a thickness of 0.7 mm, a sheet resistance ≤ 15 Ω / □, and is divided into 32 columns × 18 rows of independently controlled electrode units. Each unit is connected to an FPGA controller through an NMOS transistor.

[0033] Furthermore, the surface interaction layer 5 is chemically strengthened glass with a thickness of 0.55 mm. A hexagonal pyramid micro-pit array is laser-etched on the lower surface. The bottom diameter of the micro-pit is 50 μm, and the ratio of the depth to the bottom diameter is 1:2 ± 0.2. A silica gel layer containing nano-titanium dioxide is coated on the surface.

[0034] Furthermore, the circular assembly hole 22 is formed by a micron-level stamping die. A 5-μm nickel layer is electroplated on the inner wall of the circular assembly hole 22, the contact resistance ≤ 0.05 Ω, the surface roughness Ra of the wall of the honeycomb unit 21 ≤ 0.8 μm, and a 24-pin FPC flexible circuit interface is integrated at the edge of the base layer 1, with a pin pitch of 0.4 mm and an impedance matching tolerance ≤ ±3%.

[0035] Furthermore, the driving signal of the piezoelectric ceramic chips 23 includes a sine wave with a frequency of 120 Hz ± 10%, a pulse width of 8 ms ± 2, and a voltage peak value of 24 V. The temperature control logic of the graphene heating sheet 24 is: when the pressure value > 4 N, it heats up at a rate of 3 °C / s to 42 °C ± 1 °C, and the overshoot < 0.3 °C.

[0036] Furthermore, the electrode pitch of the capacitive sensor array layer 31 is 3.0 mm, the sensitivity range of the piezoresistive film is 0.1 - 10 N, and the linearity error is ≤ ±2%.

[0037] Furthermore, the FPGA controller pre-stores at least 5 electrode partition templates, including:

[0038] Text editing mode: The driving voltage of the electrodes in the central area is increased to +7V;

[0039] Game mode: The sensitivity of the electrodes in the four corner areas is increased by 40%.

[0040] Furthermore, the silicone coating contains 5% - 8% nano-titanium dioxide particles, the antibacterial rate is ≥ 99.7%, and the light transmittance is ≥ 92%.

[0041] Furthermore, conductive silver paste with a silver content of 72% ± 3% is injected into the circular assembly hole 22, the piezoelectric ceramic sheet 23 is vacuum-adsorbed and positioned, the capacitive sensor array layer 31 forms a double-ring electrode pattern on the polyimide film through a nanoimprinting process, the positioning accuracy is ≤ ±20 μm, and 128 gold wires with a diameter of 25 μm are connected between the ITO conductive glass and the FPGA controller by an ultrasonic welding process.

[0042] Furthermore, in the graphic design software of the multi-region pressable computer touchpad, a pressure-sensitive drawing area is generated in the left half area, the heating sheet is kept at a constant temperature of 40°C ± 0.5°C, a parameter adjustment knob is generated in the right half area, the tactile feedback simulates the 60-segment scale feeling of a physical knob, a pressure of 5N is applied to the drawing area, the capacitance layer detects ΔC = 12%, the piezoresistive layer detects ΔR = 15%, the system determines an effective operation, continuous heavy pressure is applied for 3 seconds, the heating sheet heats up to 42°C, with an error of ±0.3°C, when adjusting the knob, the piezoelectric ceramic generates a pulsed vibration of 60 times per second to simulate the "click" feeling of a physical knob.

[0043] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

Claims

1. A computer touch panel capable of pressing multiple areas, comprising a base layer (1) made of a magnesium-aluminum alloy, characterized in that: A feedback execution layer (2) is provided on the base layer (1), and a pressure sensing layer (3) is also provided on the base layer (1), a dynamic electrode layer (4) is provided on the pressure sensing layer (3), and a surface interaction layer (5) is provided on the dynamic electrode layer (4); The feedback execution layer (2) comprises a honeycomb unit (21) structure arranged in an array on the surface of the base layer (1), a circular assembly hole (22) being arranged at the center of each honeycomb unit (21) structure, six piezoelectric ceramic sheets (23) being embedded and installed in an array in the circular assembly hole (22) to form a feedback group, and a graphene heating sheet (24) is covered on the piezoelectric ceramic sheet (23); The pressure sensing layer (3) comprises a capacitive sensor array layer (31), the capacitive sensor array layer (31) is covered with a piezoresistive film (32), the capacitive sensor array layer (31) comprises 576 detection units, each detection unit adopts a concentric double-ring electrode design, the piezoresistive film (32) is arranged in a 5×8 matrix, and is offset by 0.5 mm from the apex of the honeycomb unit (21) on the base layer (1).

2. The computer touch pad capable of pressing multiple areas according to claim 1, characterized in that: The dynamic electrode layer (4) is an ITO conductive glass covering the pressure sensing layer (3), with a thickness of 0.7 mm and a square resistance of ≤15Ω / □, and is divided into 32 columns×18 rows of independently controlled electrode units, each unit being connected to an FPGA controller via an NMOS transistor.

3. The computer touch pad capable of pressing multiple areas according to claim 1, characterized in that: The surface interaction layer (5) is a chemically strengthened glass with a thickness of 0.55 mm, a hexagonal pyramidal micro-pit array is laser-etched on the lower surface, the bottom diameter of the micro-pit is 50±10 μm, the ratio of depth to bottom diameter is 1:2±0.2, and the surface is coated with a silica gel layer containing nano titanium dioxide.

4. The computer touch pad capable of pressing multiple areas according to claim 1, characterized in that: The circular assembly hole (22) is formed by a micron-level stamping die, the inner wall of the circular assembly hole (22) is electroplated with a 5μm nickel layer, the contact resistance is ≤0.05Ω, the wall roughness Ra of the honeycomb unit (21) is ≤0.8μm, the edge of the base layer (1) is integrated with a 24pin FPC flexible circuit interface, the pin spacing is 0.4mm, and the impedance matching tolerance is ≤±3%.

5. The computer touch pad capable of pressing multiple areas according to claim 1, characterized in that: The driving signal of the piezoelectric ceramic sheet (23) comprises a sine wave with a frequency of 120 Hz ± 10%, a pulse width of 8 ms ± 2, and a voltage peak of 24 V. The temperature control logic of the graphene heating sheet (24) is: when the pressure value is greater than 4N, the temperature is increased to 42°C ± 1°C at a rate of 3°C / s, and the overshoot is less than 0.3°C.

6. The computer touch pad capable of pressing multiple areas according to claim 1, characterized in that: The electrode spacing of the capacitive sensor array layer (31) is 3.0 mm, the sensitivity range of the piezoresistive film is 0.1-10N, and the linearity error is ≤±2%.

7. The multi-zone pressable computer touchpad according to claim 2, characterized in that: The FPGA controller pre-stores at least 5 electrode partition templates, including: Text editing mode: the driving voltage of the center area electrode is increased to +7V; Game Mode: Corner area electrode sensitivity increased by 40%.

8. The computer touch pad capable of pressing multiple areas according to claim 3, characterized in that: The silica gel coating contains 5%-8% of nano titanium dioxide particles, has an antibacterial rate of ≥99.7%, and a light transmittance of ≥92%.

9. The multi-zone pressable computer touchpad according to claim 2, characterized in that: Conductive silver paste with a silver content of 72%±3% is injected into the circular assembly hole (22), and the piezoelectric ceramic sheet (23) is positioned by vacuum adsorption. The capacitive sensor array layer (31) forms a double-ring electrode pattern on a polyimide film through a nano-imprinting process, with a positioning accuracy of ≤±20μm. 128 gold wires with a diameter of 25μm are connected between the ITO conductive glass and the FPGA controller through an ultrasonic welding process.

10. The multi-zone pressable computer touchpad according to claim 1, characterized in that: In the graphic design software, the left half of the multi-zone pressable computer touchpad generates a pressure-sensitive drawing area, the heating plate is kept at a constant temperature of 40°C±0.5°C, the right half generates a parameter adjustment knob, and the tactile feedback simulates the 60-segment scale of a physical knob.

Images