Capacitance detection and electromagnetic detection device

Abstract

The invention relates to a capacitance detection and electromagnetic detection device. The capacitance detection and electromagnetic detection device comprises a detection chip and a screen wiring device interacting with the detection chip, the screen wiring device comprises longitudinal wiring and transverse wiring, the transverse wiring is connected to an X pin of the detection chip, the longitudinal wiring is connected to a Y pin of the detection chip, and mutual capacitance for capacitance detection is formed between the longitudinal wiring and the transverse wiring; the detection chip is configured to perform set signal driving and detection on the screen wiring device so as to complete time-sharing detection of electromagnetism and capacitance; and the screen wiring device is configured to interact with the electromagnetic pen in the electromagnetic mode to complete the writing action. Detection of capacitance and electromagnetic signals is completed through one chip and one screen routing, part of the screen routing serves as capacitance detection routing and also serves as electromagnetic driving / detection routing, the cost of a capacitance / electromagnetic two-in-one system is greatly reduced, and electromagnetic pen detection can be achieved only by adding four screen routing.

Description

Technical Field

[0001] This invention relates to the field of touch control, and more particularly to a capacitance detection and electromagnetic detection device. Background Technology

[0002] The battery-free writing capability of electromagnetic pens is widely recognized, but screens compatible with these pens require a separate electromagnetic layer to process the pen's signals, increasing device costs. If the screen also needs to be compatible with finger touch, traditional solutions require two separate devices for simultaneous use of the finger and the electromagnetic pen, resulting in high costs. Solving this problem is a key consideration. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a capacitance detection and electromagnetic detection device, thus solving the deficiencies of the prior art.

[0004] The objective of this invention is achieved through the following technical solution: a capacitance detection and electromagnetic detection device, comprising a detection chip and a screen wiring device that interacts with the detection chip; the screen wiring device includes vertical wiring and horizontal wiring, the horizontal wiring being connected to the X pin of the detection chip, the vertical wiring being connected to the Y pin of the detection chip, and mutual capacitance being formed between the vertical wiring and the horizontal wiring for capacitance detection. The detection chip is configured to drive and detect the screen wiring device with setting signals, thereby completing the time-division detection of electromagnetic and capacitive signals. The screen wiring device is configured to interact with the electromagnetic pen in electromagnetic mode to complete the writing action.

[0005] The detection chip includes a capacitor driving unit, a capacitor detection unit, an electromagnetic driving unit, an electromagnetic detection unit, and a switching switch; the electromagnetic driving unit, the capacitor detection unit, and the electromagnetic detection unit are connected to the X pin through the switching switch, the electromagnetic detection unit and the electromagnetic driving unit are also connected to the Y pin through the switching switch, and the capacitor driving unit is also connected to the Y pin.

[0006] The X pins include X0-Xn pins, X0' pin, and Xn' pin; the Y pins include Y0-Yn pins, Y0' pin, and Yn' pin; each pin, when connected, forms a channel; the switching switches include E_TX_EN, E_RX_EN, C_RX_EN, and C_TX_EN switches. The X0', Xn', Y0', and Yn' pins are connected to the electromagnetic drive unit via the E_TX_EN switch and to the electromagnetic detection unit via the E_RX_EN switch. The X0-Xn pins are connected to the capacitance detection unit via the C_RX_EN switch, and to the electromagnetic detection unit via the E_RX_EN switch. The Y0-Yn pins are connected to the capacitor driving unit via the C_TX_EN switch, to the electromagnetic detection unit via the E_RX_EN switch, and to the electromagnetic driving unit via the E_TX_EN switch.

[0007] The device includes three working modes: capacitance detection mode, electromagnetic drive module, and electromagnetic detection. When in capacitance detection mode, the C_RX_EN and C_TX_EN switches are closed, and the capacitor is disconnected from the switch. At this time, the capacitor driving unit emits an excitation signal, which returns to the capacitance detection unit through mutual capacitance. When a finger touches one of the channels in the X0-Xn pins, the capacitance detection unit of the corresponding channel detects the change in the returned signal, thereby sensing the finger touch behavior.

[0008] When in electromagnetic drive mode, the E_TX_EN switch is closed and the other switches are open. At this time, the electromagnetic drive unit emits an excitation signal, and current is formed between each pair of multiple electromagnetic drive units. When the current is an AC signal, an eddy current field is formed at the center of the screen wiring device, which charges the electromagnetic pen.

[0009] When in electromagnetic detection mode, the E_RX_EN switch is closed, the channel is connected to the electromagnetic detection unit 304, and the other switches are open. At this time, the capacitor drive unit, capacitor detection unit, and electromagnetic drive unit are not working.

[0010] When the electromagnetic pen completes charging in electromagnetic drive mode and enters electromagnetic detection mode, it releases the charged electrical energy to generate an alternating electric field that forms electromagnetic eddy currents. These eddy currents generate an electromotive force in the screen wiring device, which in turn causes the electromagnetic detection unit connected to the corresponding channel to detect the voltage change, thereby detecting the position information of the electromagnetic pen.

[0011] This invention has the following advantages: a capacitance and electromagnetic detection device that completes the detection of both capacitance and electromagnetic signals through a single chip and a screen trace. Part of the screen trace serves as both capacitance detection trace and electromagnetic drive / detection trace, significantly reducing the cost of the integrated capacitance / electromagnetic system. By switching the chip internally, it can operate in electromagnetic drive mode / electromagnetic detection mode / capacitance detection mode, performing capacitance and electromagnetic pen detection in a time-sharing manner, eliminating the need for an external switch. Based on traditional capacitance detection, electromagnetic pen detection can be achieved by adding only four screen traces. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the screen wiring device. Figure 3 Schematic diagram of the detection chip Figure 1 ; Figure 4 Schematic diagram of the detection chip Figure 2 ; Figure 5 Schematic diagram of the detection chip Figure 3 ; Figure 6 A schematic diagram of the capacitance detection mode. Figure 1 ; Figure 7 A schematic diagram of the capacitance detection mode. Figure 2 ; Figure 8 This is a schematic diagram of the electromagnetic drive mode; Figure 9 This is a schematic diagram of the electromagnetic detection mode; Figure 10 This is a schematic diagram of an electromagnetic pen test. In the diagram: 101-Detection chip, 102-Screen wiring device, 103-Electromagnetic pen, 201-Vertical wiring, 202-Horizontal wiring, 203-Mutual capacitance, 301-Capacitor driving unit, 302-Capacitor detection unit, 303-Electromagnetic driving unit, 304-Electromagnetic detection unit, 305-Changeover switch. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application provided below with reference to the accompanying drawings is not intended to limit the scope of protection of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The present invention will be further described below with reference to the accompanying drawings.

[0014] This invention specifically relates to a capacitance and electromagnetic detection device. In this invention, the detection chip 101 has an electromagnetic / touch multiplexed pin, and the detection chip 101 switches between electromagnetic and capacitance modes in a time-division multiplexing manner. This invention achieves time-division multiplexing of capacitance and electromagnetic detection using only a single chip.

[0015] like Figure 1 As shown, the device includes a detection chip 101 and a screen routing device 102, requiring only a single chip and electromagnetically and capacitively compatible screen routing. The detection chip 101 provides specific signal drive and detection for the screen routing device, thereby completing time-division multiplexing of electromagnetic and capacitive detection. In electromagnetic mode, the screen routing device 102 can interact with the electromagnetic pen 103 to complete writing actions.

[0016] like Figure 2 As shown, the screen routing device 102 has two types of traces: vertical trace 201 and horizontal trace 202. A mutual capacitance 203 for capacitance detection is formed between the horizontal and vertical traces. The horizontal trace 202 is connected to the X pin of the detection chip 101, as shown in the figure (X0 / X1… / Xn). The vertical trace 201 is connected to the Y pin of the detection chip 101, as shown in the figure (Y0 / Y1… / Ym). Four traces connect to two pins of the chip: X0 / X0', Xn / Xn', Y0 / Y0', and Ym / Ym'.

[0017] Furthermore, such as Figures 3-5 As shown, the detection chip 101 includes a capacitor driving unit 301, a capacitor detection unit 302, an electromagnetic driving unit 303, an electromagnetic detection unit 304, and a switching switch 305.

[0018] The four special pins X0' / Xn' / Y0' / Ym' are each connected to an electromagnetic drive unit (303) and an electromagnetic detection unit (304) via E_TX_EN and E_RX_EN switches.

[0019] Even-numbered and odd-numbered Y-channels emerge from both sides, evenly distributing the number of wires on both sides and effectively preventing an excessive number of Y-channels on one side, which would result in a wide black border on the screen. The total number of traces in the device is (n+1)+(m+1)+4, where n+1 refers to the number of traces from X0 to Xn, m+1 refers to the number of traces from Y0 to Ym, and 4 are the four special pins X0' / Xn' / Y0' / Ym'. It can be considered that this invention, based on traditional capacitance detection, achieves combined capacitance / electromagnetic detection by adding only four pins.

[0020] Furthermore, the X pins X0-Xn are each connected to a capacitor detection unit 302 and an electromagnetic detection unit 304 via switches C_RX_EN and E_RX_EN. The Y pins Y0-Ym are each connected to a capacitor driving unit 301, an electromagnetic detection unit 304, and an electromagnetic driving unit 303 via switches C_RX_EN, E_TX_EN, and E_RX_EN.

[0021] like Figure 6As shown, this invention has three working modes: capacitance detection mode, electromagnetic drive mode, and electromagnetic detection mode.

[0022] When in capacitance detection mode: C_TX_EN and C_RX_EN switches will be closed, and the remaining switches will be open. Capacitor drive unit 301 emits an excitation signal, which returns to capacitance detection unit 302 via mutual capacitor 203. The excitation signal is an AC signal, typically with a frequency of 0-500kHz. Due to its AC characteristics, it can pass through mutual capacitor 203. In this mode, neither electromagnetic drive unit 303 nor electromagnetic detection unit 304 operates. Figure 7 As shown, when a finger touches the X1-Y3 channel, the capacitance detection unit 302 of the X1 channel can detect the change in the returned signal, thereby sensing the finger touch behavior.

[0023] like Figure 8 As shown, in electromagnetic drive mode: the E_TX_EN switch will be closed, and the other switches will be open. The electromagnetic drive unit 303 emits an excitation signal, and currents are formed between each of the four EMR-TX pairs: X0' flows to X0, Xn flows to Xn', Y0 flows to Y0', and Ym flows to Ym'. The four traces on the outermost ring of the screen all flow in a counterclockwise direction. When the current is an AC signal, these four traces will form an eddy current field at the center of the screen, which will charge the electromagnetic pen 103. In this mode, the capacitor drive unit 301, capacitor detection unit 302, and electromagnetic detection unit 304 do not work.

[0024] like Figure 9 As shown, when in electromagnetic detection mode: the E_RX_EN switch will be closed, the channel will be connected to the electromagnetic detection unit 304, and the other switches will be open. In this mode, the capacitor drive unit 301, capacitor detection unit 302, and electromagnetic drive unit 303 will not work.

[0025] like Figure 10 As shown, after the electromagnetic pen 102 completes charging in electromagnetic drive mode and enters electromagnetic detection mode, it releases the charged electrical energy, generating an alternating electric field and forming electromagnetic eddy currents. These eddy currents create an electromotive force on the X1 / X2 / Y2 / Y3 traces in the diagram, further causing the electromagnetic detection unit 304 connected to X1 / X2 / Y2 / Y3 to detect voltage changes, thereby detecting the position information of the electromagnetic pen 102.

[0026] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and improvements, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A capacitance detection and electromagnetic detection device, characterized in that: It includes a detection chip and a screen routing device that interacts with the detection chip; the screen routing device includes vertical routing and horizontal routing, the horizontal routing is connected to the X pin of the detection chip, the vertical routing is connected to the Y pin of the detection chip, and a mutual capacitance is formed between the vertical routing and the horizontal routing for capacitance detection. The detection chip is configured to drive and detect the screen wiring device with setting signals, thereby completing the time-division detection of electromagnetic and capacitive signals. The screen wiring device is configured to interact with the electromagnetic pen in electromagnetic mode to complete the writing action.

2. The capacitance detection and electromagnetic detection device according to claim 1, characterized in that: The detection chip includes a capacitor driving unit, a capacitor detection unit, an electromagnetic driving unit, an electromagnetic detection unit, and a switching switch; the electromagnetic driving unit, the capacitor detection unit, and the electromagnetic detection unit are connected to the X pin through the switching switch, the electromagnetic detection unit and the electromagnetic driving unit are also connected to the Y pin through the switching switch, and the capacitor driving unit is also connected to the Y pin.

3. The capacitance detection and electromagnetic detection device according to claim 2, characterized in that: The X pins include X0-Xn pins, X0' pin, and Xn' pin; the Y pins include Y0-Yn pins, Y0' pin, and Yn' pin; each pin, when connected, forms a channel; the switching switches include E_TX_EN, E_RX_EN, C_RX_EN, and C_TX_EN switches. The X0', Xn', Y0', and Yn' pins are connected to the electromagnetic drive unit via the E_TX_EN switch and to the electromagnetic detection unit via the E_RX_EN switch. The X0-Xn pins are connected to the capacitance detection unit via the C_RX_EN switch, and to the electromagnetic detection unit via the E_RX_EN switch. The Y0-Yn pins are connected to the capacitor driving unit via the C_TX_EN switch, to the electromagnetic detection unit via the E_RX_EN switch, and to the electromagnetic driving unit via the E_TX_EN switch.

4. The capacitance detection and electromagnetic detection device according to claim 3, characterized in that: The device includes three working modes: capacitance detection mode, electromagnetic drive module, and electromagnetic detection. When in capacitance detection mode, the C_RX_EN and C_TX_EN switches are closed, and the capacitor is disconnected from the switch. At this time, the capacitor driving unit emits an excitation signal, which returns to the capacitance detection unit through mutual capacitance. When a finger touches one of the channels in the X0-Xn pins, the capacitance detection unit of the corresponding channel detects the change in the returned signal, thereby sensing the finger touch behavior.

5. The capacitance detection and electromagnetic detection device according to claim 4, characterized in that: When in electromagnetic drive mode, the E_TX_EN switch is closed and the other switches are open. At this time, the electromagnetic drive unit emits an excitation signal, and current is formed between each pair of multiple electromagnetic drive units. When the current is an AC signal, an eddy current field is formed at the center of the screen wiring device, which charges the electromagnetic pen.

6. The capacitance detection and electromagnetic detection device according to claim 4, characterized in that: When in electromagnetic detection mode, the E_RX_EN switch is closed, the channel is connected to the electromagnetic detection unit 304, and the other switches are open. At this time, the capacitor drive unit, capacitor detection unit, and electromagnetic drive unit are not working.

7. The capacitance detection and electromagnetic detection device according to claim 4, characterized in that: When the electromagnetic pen completes charging in electromagnetic drive mode and enters electromagnetic detection mode, it releases the charged electrical energy to generate an alternating electric field that forms electromagnetic eddy currents. These eddy currents generate an electromotive force in the screen wiring device, which in turn causes the electromagnetic detection unit connected to the corresponding channel to detect the voltage change, thereby detecting the position information of the electromagnetic pen.

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