CN103019425A - Dual-mode digital board and method for detecting and switching input signal thereof - Google Patents

Abstract

A double-mode digital board and a detection and switching method of input signals thereof are applied to a digital board with an electromagnetic induction module and a touch input module. The detection and switching method comprises the following steps: the microprocessor connects the induction coil group to the electromagnetic induction module; the microprocessor detects whether the electromagnetic induction signal is transmitted; after the electromagnetic induction module finishes receiving the electromagnetic induction signal, the microprocessor switches and connects the induction coil group to the touch input module; during the period that the microprocessor receives the touch input signal, the microprocessor can sequentially connect the induction coil group to any one of the electromagnetic induction module or the touch input module; when the microprocessor detects that the electromagnetic induction signal is transmitted, the microprocessor continuously connects the electromagnetic induction module to the induction coil group until the electromagnetic induction signal is received.

Description

Detection and switching method of dual-mode digital board and its input signal

technical field

The invention relates to a digital board and a signal detection and switching method, in particular to a dual-mode digital board and its input signal detection and switching method.

Background technique

With the rapid development of science and technology, many man-machine interfaces with touch operations are also produced. Such an operation mode can be applied not only to an independent digital board, but also to a display device. Generally speaking, touch operations can be divided into pen-type operations and finger operations. The pen touch is to detect the corresponding position through the electromagnetic change between the digital board and the electromagnetic pen. The finger operation is to judge its corresponding position through the capacitance change generated when pressing the digital board.

Due to the convenience brought by the aforementioned touch technology, some manufacturers further combine the aforementioned touch technology with the display device, which is defined as a touch display here. Please refer to FIG. 1 , which is a schematic structural diagram of a dual-mode digital board in the prior art. The prior art touch display 100 has an electromagnetic signal receiving module 110 and a touch sensing module 121 at the same time. The user can operate by writing or handwriting on the display, which is more intuitive for the user.

Although the conventional touch display 100 has the above-mentioned advantages, it is difficult for manufacturers to manufacture and maintain. The touch display 100 in the prior art is composed of a plurality of sensing antennas 112 , an electromagnetic signal receiving module 110 , a touch sensing module 121 , a display unit 141 and a display driver 151 . The electromagnetic signal receiving module 110 and the touch sensing module 121 are switched by the processing unit 131 to receive electromagnetic signals or touch signals. When a component in the display is damaged, the entire touch display 100 must be sent to the factory for repair. Therefore, the manufacturing cost of the conventional touch display 100 is bound to increase, and its subsequent maintenance costs are not cheap.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a dual-mode digital board, which is applied to a digital board with two operation modes, especially the operation modes of electromagnetic pen and finger touch.

The dual-mode digital board disclosed in the present invention includes: a microprocessor, an induction coil group, an electromagnetic induction module and a touch input module. The electromagnetic induction module can be selectively electrically connected to the induction coil group, and the electromagnetic induction module is used for receiving electromagnetic induction signals generated by the electromagnetic pen and the digital board. The touch input module can be selectively electrically connected to the induction coil group, and the touch input module is used for receiving touch input signals from fingers on the digital board. The microprocessor is electrically connected to the electromagnetic induction module and the touch input module, and the microprocessor selects one of the electromagnetic induction module and the touch input module and is connected to the induction coil set.

Wherein, when the microprocessor receives the electromagnetic induction signal produced by the electromagnetic pen, when the microprocessor is connected to the induction coil group through the electromagnetic induction module, the microprocessor continuously receives the electromagnetic induction signal until the electromagnetic pen leaves the digital board. If the user touches the digital board with a finger, the microprocessor is connected to the induction coil group through the touch input module to receive the touch input signal. When the microprocessor receives the touch input signal, the microprocessor also connects the electromagnetic induction module to the induction coil group to detect the electromagnetic induction signal generated when the electromagnetic pen approaches.

The present invention also proposes a method for detecting and switching input signals of a dual-mode digital board, including the following steps: the microprocessor executes the electromagnetic induction mode, and the induction coil group is connected to the electromagnetic induction module to receive the electromagnetic induction signal; After the microprocessor finishes receiving the electromagnetic induction signal, the microprocessor executes the touch input mode; in the touch input mode, the microprocessor sequentially connects the induction coil to any one of the touch input module or the electromagnetic induction module, Used to receive touch input signals or electromagnetic induction signals; when in touch input mode and receiving electromagnetic induction signals, the microprocessor switches to electromagnetic induction mode until the reception of electromagnetic induction signals is completed, and then switches back to touch The input mode; after the touch input mode receives the touch input signal, the electromagnetic induction mode is executed.

The dual-mode digital board proposed by the present invention can simultaneously receive the input signals of the electromagnetic pen and the finger through a single induction coil group, so as to reduce the components and manufacturing costs required for the two different input methods.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of the architecture of the dual-mode digital board of the prior art;

FIG. 2A is a schematic diagram of the architecture of the present invention;

FIG. 2B is a schematic structural diagram of the first direction signal line and the second direction signal line of the present invention;

2C is a schematic diagram of the connection between the first direction signal line, the first direction signal switching device and the first direction signal connection unit of the present invention;

2D is a schematic diagram of signal reception in the electromagnetic induction mode of the present invention;

2E is a schematic diagram of signal reception in the touch input mode of the present invention;

FIG. 3A is a schematic diagram of the operation flow of the present invention;

FIG. 3B is a schematic diagram of state transition of the present invention.

Among them, reference signs

Touch Monitor 100

Electromagnetic signal receiving module 111

Induction antenna 112

Touch sensing module 121

processing unit 131

display unit 141

display driver 151

Dual mode digital board 200

microprocessor 210

Induction coil set 220

First direction signal line 221

Second direction signal line 222

Electromagnetic induction module 230

First direction signal switching device 231

First direction signal connection unit 232

The second direction signal switching device 233

The second direction signal connection unit 234

Touch input module 240

Electromagnetic Pen 251

finger 252

The first loop Loop1

The second loop Loop2

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

The dual-mode digital board 200 of the present invention is applied in two operation modes of electromagnetic pen and finger touch. The dual-mode digital board 200 can be realized through capacitive, resistive or optical sensing methods. The dual-mode digital board 200 of the present invention can operate independently, and can also be applied to different devices (such as monitors, mobile phones or personal computers). For example, the dual-mode digital board 200 of the present invention can be further combined with a display unit. For the convenience of description, the dual-mode digital board 200 is only used for description, and it is not limited to this aspect. Wherein, the two operation modes are the electromagnetic induction mode of inducting the electromagnetic pen, and the touch input mode of detecting the finger.

Please refer to FIG. 2A , which is a schematic diagram of the architecture of the present invention. The dual-mode digital board 200 of the present invention includes a microprocessor 210 , an induction coil set 220 , an electromagnetic induction module 230 and a touch input module 240 . The microprocessor 210 is electrically connected to the electromagnetic induction module 230 and the touch input module 240 . The induction coil set 220 is optionally connected to any one of the electromagnetic induction module 230 or the touch input module 240 (shown by a dotted line in FIG. 2A ).

When the electromagnetic induction module 230 is connected to the induction coil set 220 , the induction coil set 220 is used to receive the electromagnetic induction signal generated by the electromagnetic pen approaching the dual-mode digital board 200 . The induction coil set 220 is composed of a plurality of first direction signal lines 221 and a plurality of second direction signal lines 222 , as shown in FIG. 2B . In FIG. 2B , the selected first-direction signal line 221 and the plurality of second-direction signal lines 222 are represented by a thick black dotted line frame. The first direction signal line 221 and the second direction signal line 222 belong to different layers. In FIG. 2B , the dual-mode digital board 200 is viewed from a top view, so the signal lines 221 in the first direction and the signal lines 222 in the second direction overlap each other as shown in a grid.

In the present invention, the first direction signal lines 221 refer to the signal lines on the horizontal axis (that is, the X axis in FIG. 2B ), and the total number of first direction signal lines 221 is defined as n. In the present invention, the second direction signal lines 222 refer to the signal lines on the vertical axis (ie, the Y axis in FIG. 2B ), and the total number of second direction signal lines 222 is defined as n. The electromagnetic induction module 230 further includes a first direction signal switching device 231 , a first direction signal connection unit 232 , a second direction signal switching device 233 and a second direction signal connection unit 234 . In order to clearly show that the first direction signal connection unit 232 and the touch input module 240 are connected to the first direction signal line 221 at the same time, in FIG. control input module 240.

The microprocessor 210 is electrically connected to the first direction signal switching device 231 , the first direction signal connecting unit 232 , the second direction signal switching device 233 and the second direction signal connecting unit 234 . In order to clearly define the signal lines in use, the selected first direction signal line 221 is defined as Xa, where X is the first direction signal line 221, a is any one of 1 to m, and m is a natural number. Similarly, the selected second direction signal line 222 is defined as Yb, wherein Y is the first direction signal line 221 , b is any one of 1˜n, and n is a natural number.

Both ends of each first direction signal line 221 are electrically connected to the first direction signal switching device 231 and the first direction signal connection unit 232 respectively. Two ends of each second direction signal line 222 are electrically connected to the second direction signal switching device 233 and the second direction signal connection unit 234 respectively. In the present invention, in the operation mode of electromagnetic induction or touch input, the induction coil set 220 will also perform corresponding induction processing (the operation process will be described in detail later).

The following uses the first direction signal line 221 as an illustration. Please refer to FIG. 2C , which is a schematic diagram of the connection between the first direction signal line 221 and the first direction signal switching device 231 and the first direction signal connection unit 232 of the present invention. . In FIG. 2C , two adjacent signal lines Xa and Xa+1 in the first direction are used for illustration. But in fact, two of the first direction signal lines 221 can be selected to perform the following processing according to different algorithms. For example, the microprocessor 210 can select the two first direction signal lines Xa, Xa+3 with a larger interval, so as to speed up the scanning speed. The selection of the second direction signal line 222 is the same as that of the first direction signal line 221 , so the description will not be repeated.

According to the foregoing, one end of the first direction signal line 221 is connected to the first direction signal switching device 231 . The microprocessor 210 connects the selected first direction signal line 221Xa to the analog-to-digital converter of the first direction signal switching device 231, and the other first direction signal line Xa+1 is connected to the first direction signal switching device 231 grounding point. The other end of the first direction signal line 221 is connected to the first direction signal connection unit 232 . Similarly, the two ends of the two second direction signal lines Yb, Yb+1 are also connected to the second direction signal switching device 233 and the second direction signal connection unit 234 respectively.

When the dual-mode digital board 200 is in the electromagnetic induction mode, the microprocessor 210 will sequentially select the above-mentioned first direction signal line 221, and drive the first direction signal connection unit 232 to connect the selected two first direction signal lines. Line 221 is shorted. The microprocessor 210 also performs the aforementioned selection on the second direction signal lines 222 , and drives the second direction signal connection unit 234 to short-circuit the two selected second direction signal lines 222 . Whenever the microprocessor 210 scans once, it can be judged whether there is an electromagnetic pen 251 approaching according to the short circuit situation at each position. Please refer to FIG. 2D , which is a schematic diagram of signal reception in the electromagnetic induction mode of the present invention.

When the dual-mode digital board 200 is in the touch input mode, the microprocessor 210 will drive the touch input module 240 to receive touch input signals. The microprocessor 210 disconnects the induction coil set 220 from the electromagnetic induction module 230 , and at the same time the touch input module 240 is connected to the induction coil set 220 . In the touch input mode, the induction coil group 220 judges the position of the finger 252 according to the capacitance value change generated by the finger 252 pressing the digital pad. Since the first direction signal line 221 and the second direction signal line 222 are arranged like a mesh structure (please refer to FIG. The distance between the direction signal lines 222 , thereby changing the capacitance value at this position. The touch input module 240 can obtain the position of the finger 252 on the digital board according to the changed capacitance value, as shown in FIG. 2E . In FIG. 2E , the thick black line is used as the touch input signal sent from this position, and for convenience, the second direction signal line on the left side of FIG. 2E is connected to the touch input module 240 through a bus.

Please refer to FIG. 3A and FIG. 3B at the same time, which are schematic diagrams of the operation flow and state transition of the present invention. The signal detection and switching method of the present invention comprises the following steps:

Step S310: the microprocessor connects the induction coil to the electromagnetic induction module to receive the electromagnetic induction signal;

Step S320: After the microprocessor finishes receiving the electromagnetic induction signal, the microprocessor executes the touch input mode;

Step S330: In the touch input mode, the microprocessor sequentially connects the induction coil to any one of the touch input module or the electromagnetic induction module to receive touch input signals or electromagnetic induction signals;

Step S340: When in the touch input mode and receiving the electromagnetic induction signal, the microprocessor switches to the electromagnetic induction mode until the electromagnetic induction signal is received, and switches back to the touch input mode; and

Step S350: Execute the electromagnetic induction mode after the touch input mode finishes receiving the touch input signal.

The dual-mode digital board 200 of the present invention can be switched between an electromagnetic induction mode and a touch input mode, and the digital board has corresponding signal receiving and processing in different modes. First, when the dual-mode digital board 200 starts to operate, the dual-mode digital board 200 will drive the electromagnetic induction module 230 to connect to the induction coil set 220 and execute the electromagnetic induction mode (corresponding to step S310 ). When the dual-mode digital board 200 enters the electromagnetic induction mode, the microprocessor 210 can receive the electromagnetic induction signal when the electromagnetic pen 251 moves through the induction coil set 220 and the electromagnetic induction module 230 .

When the microprocessor 210 executes the electromagnetic induction mode, the microprocessor 210 will continuously detect whether the electromagnetic induction signal is input in the first loop Loop1. If the microprocessor 210 detects that the electromagnetic induction signal is input during the first cycle Loop1, the microprocessor 210 will recount the first cycle Loop1 and detect whether the electromagnetic induction signal is input. In other words, whenever the microprocessor 210 detects a new electromagnetic induction signal, the microprocessor 210 restarts the timing, and detects whether there is an electromagnetic induction signal in a new first cycle Loop1. As shown in FIG. 3B , if the microprocessor 210 receives the electromagnetic induction signal in the first loop Loop1, it will continue to maintain the electromagnetic induction mode. If the microprocessor 210 detects no electromagnetic induction signal input during the first loop Loop1, the microprocessor 210 exits the electromagnetic induction mode and executes the touch input mode (corresponding to step S320). The time length of the first loop Loop1 can be determined according to the area of the dual-mode digital board 200 or the number of signal lines.

In the touch input mode, the microprocessor 210 sequentially connects the induction coil to any one of the touch input module 240 or the electromagnetic induction module 230 . The microprocessor 210 detects whether there is a touch input signal or an electromagnetic induction signal during the second cycle Loop2. The dual-mode digital board 200 of the present invention first connects the touch input module 240 to the induction coil set 220 in the touch input mode. The microprocessor 210 then switches the induction coil set 220 to the electromagnetic induction module 230 . In other words, the microprocessor 210 will sequentially connect the touch input module 240 and the electromagnetic induction module 230 to the induction coil set 220 in the second loop Loop2. During the second cycle Loop2, if the touch input module 240 is connected to the induction coil set 220 , the microprocessor 210 receives the touch input signal through the touch input module 240 . If the electromagnetic induction module 230 is connected to the induction coil set 220, the microprocessor 210 receives the electromagnetic induction signal through the electromagnetic induction module 230 (corresponding to step S330). The time length of the second loop Loop2 can be determined according to the area of the dual-mode digital board 200 or the number of signal lines.

If the electromagnetic induction signal is received during the second loop Loop2, the microprocessor 210 will continue to detect whether there is an electromagnetic induction signal in the manner of the first loop Loop1. If the microprocessor 210 still receives a new electromagnetic induction signal during the first loop Loop1, the microprocessor 210 will continue to detect whether there is an electromagnetic induction signal in the first loop Loop1. If the first loop Loop1 is exceeded and no new electromagnetic induction signal is received, the microprocessor 210 re-enters the electromagnetic induction mode, as shown in FIG. 3B . When the user touches with the finger 252 , if the electromagnetic pen 251 approaches the dual-mode digital board 200 at the same time, the dual-mode digital board 200 will preferentially receive the electromagnetic induction signal of the electromagnetic pen 251 . In this way, the position interference of the hand to the electromagnetic pen 251 can be reduced when the dual-mode digital board 200 is using the electromagnetic pen 251 . This anti-interference mechanism is called anti-palm rejection (Palm rejection).

In addition to the above operation mode in the second cycle Loop2, the present invention may have the following variations. If the electromagnetic induction signal is received during the second loop Loop2, the microprocessor 210 will continue to detect whether there is an electromagnetic induction signal in the manner of the first loop Loop1. When the microprocessor 210 switches to the first loop Loop1, the microprocessor 210 will also record the remaining time of the second loop Loop2. If the microprocessor 210 does not receive a new electromagnetic induction signal after the first loop Loop1, the microprocessor 210 will return to the subsequent processing of the second loop Loop2 to continue to detect the touch input signal. Different from the aforementioned embodiments, in this embodiment, the microprocessor 120 returns to the incomplete state of the second loop Loop2 after executing the first loop Loop1 and continues to execute.

The dual-mode digital board 200 proposed by the present invention can simultaneously receive the input signals of the electromagnetic pen 251 and the finger 252 through a single induction coil group 220, thereby reducing the components required for the two different input methods, manufacturing costs and maintenance costs.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (8)

1. A dual-mode digital board is characterized in that, comprising: an induction coil set; An electromagnetic induction module can be selectively electrically connected to the induction coil group, and the electromagnetic induction module is used to receive an electromagnetic induction signal; a touch input module, which can be selectively electrically connected to the induction coil group, the touch input module is used to receive a touch input signal; and A microprocessor is electrically connected to the electromagnetic induction module and the touch input module, the microprocessor selects one of the electromagnetic induction module and the touch input module, and is connected to the induction coil group; Wherein, when the microprocessor is executing an electromagnetic induction mode, the microprocessor connects the electromagnetic induction module to the induction coil group, and when the microprocessor receives the electromagnetic induction signal during the electromagnetic induction mode, then The microprocessor continues to execute the electromagnetic induction mode and detects whether the electromagnetic induction signal is present, and if there is no input of the electromagnetic induction signal, the microprocessor stops executing the electromagnetic induction mode and executes a touch input mode; and When the microprocessor executes the touch input mode, the microprocessor sequentially connects the induction coil group to any one of the touch input module or the electromagnetic induction module to receive the touch input signal or The electromagnetic induction signal, if the microprocessor receives the electromagnetic induction signal during a second cycle, the microprocessor switches to the touch input mode and receives the electromagnetic induction signal until the electrical induction signal is completed Magnetic induction signal reception. 2 . The dual-mode digital board according to claim 1 , wherein the induction coil set further comprises at least one first direction signal line and at least one second direction signal line. 3. The dual-mode digital board according to claim 2, characterized in that, the electromagnetic induction module also includes a first direction signal switching device and a first direction signal connection unit (X), the first direction signal line The two ends are respectively electrically connected to the first direction signal switching device and the first direction signal connection unit, the first direction signal connection unit selects at least two signal lines from the first direction signal lines, and connects the selected Signal lines are short-circuited. 4. The dual-mode digital board according to claim 2, characterized in that, the electromagnetic induction module also includes a second direction signal switching device (YY) and a second direction signal connection unit (Y), the second direction Both ends of the signal line are respectively electrically connected to the second direction signal switching device and the second direction signal connection unit, the second direction signal connection unit selects at least two signal lines from the second direction signal lines, and Short-circuit the selected signal lines. 5. A detection and switching method of an input signal of a dual-mode digital board, applied in a digital board having an electromagnetic induction module and a touch input module, characterized in that the detection and switching method of the input signal includes the following step: An electromagnetic induction mode is executed by a microprocessor, and an induction coil group is connected to the electromagnetic induction module to receive an electromagnetic induction signal; After the microprocessor finishes receiving the electromagnetic induction signal, the microprocessor executes a touch input mode; In the touch input mode, the microprocessor sequentially connects the induction coil to any one of the touch input module or the electromagnetic induction module to receive a touch input signal or the electromagnetic induction signal; When the touch input mode is in and the electromagnetic induction signal is received, the microprocessor switches to the electromagnetic induction mode until the reception of the electromagnetic induction signal is completed, and switches back to the touch input mode; and After the touch input mode finishes receiving the touch input signal, the electromagnetic induction mode is executed. 6. The detection and switching method of the input signal of the dual-mode digital board according to claim 5, wherein judging that the microprocessor completes receiving the electromagnetic induction signal when in the electromagnetic induction mode also includes: The microprocessor determines whether the electromagnetic induction signal is received during a first cycle; and When the microprocessor receives the electromagnetic induction signal, it recounts the first cycle until no new electromagnetic induction signal is received after the first cycle. 7. The detection and switching method of the input signal of the dual-mode digital board according to claim 5, wherein judging that the microprocessor completes receiving the touch input signal in the touch input mode further comprises: The microprocessor determines whether the electromagnetic induction signal or the touch input signal is received during a second cycle; and When the microprocessor receives the electromagnetic induction signal, the microprocessor counts with a first cycle until no new electromagnetic induction signal is received after the first cycle. 8. The method for detecting and switching the input signal of the dual-mode digital board according to claim 5, wherein judging that the microprocessor has completed receiving the touch input signal in the touch input mode further comprises: The microprocessor determines whether the electromagnetic induction signal or the touch input signal is received during a second cycle; When the microprocessor receives the electromagnetic induction signal, the microprocessor records the timing progress of the second cycle, and counts with a first cycle until no new electromagnetic induction signal is received after the first cycle. signal; and After the microprocessor returns to the second loop from the first loop, the microprocessor continues to detect whether the electromagnetic induction signal or the touch input signal is received according to the timing progress of the second loop until the second loop is completed .

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