TWI459270B - Touch sensing apparatus - Google Patents

Description

Touch sensing device

The present invention relates to a touch-sensitive liquid crystal display; in particular, the present invention relates to a touch sensing device capable of reducing charging time and increasing scanning rate.

With the rapid development of technology, thin film transistor liquid crystal display (TFT LCD) has gradually replaced traditional displays, and has been widely used in various electronic products such as televisions, flat panel displays, mobile phones, tablet computers and projectors. For a thin film transistor liquid crystal display with touch function, the touch sensor is one of the important modules, and the performance of the touch sensor directly affects the overall performance of the liquid crystal display.

In general, a conventional liquid crystal display having a mutual capacitive touch function includes a display panel, an ITO sensor, and a touch control chip. The conductive film sensor includes a plurality of scan lines and a plurality of drive lines, and the touch control chip includes a plurality of pins and a plurality of storage capacitors. The scan lines are respectively coupled to the pins. When the driving line transmits a driving pulse and a small voltage is coupled to the scanning line, the touch control chip senses the coupling voltage and determines whether the conductive film sensor is touched according to the magnitude of the coupling voltage. In the actual case, the coupling voltage is stored in the storage capacitors through the pins, and the storage capacitors are discharged before being stored, so that the storage capacitor has a charge value of 0 to prevent the previously stored charge from remaining in the storage capacitor. .

However, the above conventional liquid crystal display touch sensing method has some serious drawbacks such as a scanning rate that is too low and consumes unnecessary power. For example, the storage capacitor is fully discharged before each charge. Then, during charging, the charge value of the storage capacitor is charged from 0 to the detected voltage value. In other words, the traditional approach takes extra time to discharge, and requires additional voltage for charging, which does not improve efficiency and save power.

Therefore, the present invention provides a touch sensing device to solve the above problems.

In view of the above prior art problems, the present invention proposes a touch sensing device capable of avoiding power consumption and improving efficiency.

In one aspect, the present invention provides a touch sensing device that reduces charging time to improve efficiency.

In one aspect, the present invention provides a touch sensing device capable of distributing charge evenly to reduce power.

In one embodiment, the touch sensing device of the present invention includes a logic control module, at least one operational control module, and at least one storage control module. The logic control module is configured to generate a plurality of control signals of different control timings, wherein the control signals include operation control signals and parallel control signals. Each of the operational control modules includes a positive input terminal, a negative input terminal, and an output terminal, and the operation control module operates on the two voltages received from the positive input terminal and the negative input terminal according to the operation control signal, and outputs the output through the output terminal. Analog data after calculation.

In a practical application, the storage control module is coupled to the logic control module and the operation control module. Each of the storage control modules respectively includes a plurality of storage capacitors, and one end of each storage capacitor is coupled to each other. The storage control module evenly distributes the residual charges in the storage capacitors according to the parallel control signals, so that each storage capacitor stores the same storage voltage.

It should be noted that each storage capacitor stores the first sensing voltage according to the storage control signal in the control signals, so that the voltage stored in the storage capacitor changes from the original storage voltage to the first sensing voltage.

Since the conventional touch sensing device discharges the residual charge of the storage capacitors included in the storage control module, such storage capacitors cannot store residual charges, so additional time and voltage are required to charge the storage capacitors. Therefore, compared with the prior art, the touch sensing device according to the present invention couples the storage capacitors included in the storage control module to each other, so that the storage control module can evenly distribute the residual charge of the storage capacitor. Since the discharge is not performed, the discharge time can be omitted. In addition, when the storage capacitor is being charged, the stored voltage changes from the storage voltage to the first sensing voltage, thereby reducing the charging time. Therefore, the touch sensing device of the present invention can distribute the residual charge by coupling the storage capacitors, thereby effectively eliminating the discharge time and reducing the charging time, thereby improving the efficiency.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

According to an embodiment of the invention, a touch sensing device is provided. In this embodiment, the touch sensing device may be a mutual-capacitive capacitive touch sensing device, but is not limited thereto.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing touch sensing of a conductive film sensor according to the touch sensing device 1A of the present invention. As shown in FIG. 1 , the liquid crystal display includes a touch sensing device 1A and a conductive film sensor 2 . The conductive film sensor 2 includes a plurality of sensing lines 80 and a plurality of driving lines 90 that are vertically distributed to each other. It should be noted that the driving line 90 and the sensing line 80 are interchangeable, that is, the 90 in FIG. 1 can also be used as a sensing line, and the 80 in FIG. 1 can also be used as a driving line. The measuring device 1A controls, but is not limited thereto. In this embodiment, the different pins 20 can respectively scan one driving line 90 and simultaneously sense the sensing lines 80 to sense the plurality of analog data.

As shown in FIG. 1 , the touch sensing device 1A includes a logic control module 10 , a plurality of pins 20 , a driving/sensing control module 30 , an arithmetic control module 40 , a storage control module 50 , and parallel/series control. Module 60 and analog/digital conversion module 70. The driving/sensing control module 30 is coupled to the pins 20 and the logic control module 10; the computing control module 40 is coupled to the driving/sensing control module 30 and the storage control module 50; The serial control module 60 is coupled to the storage control module 50 and the analog/digital conversion module 70; the analog/digital conversion module 70 is coupled to the parallel/series control module 60 and the logic control module 10. It should be noted that, in other embodiments, the storage control module 50 can also be coupled to the driving/sensing control module 30 and the computing control module 40 without particular limitation.

In this embodiment, the logic control module 10 is configured to generate a plurality of control signals of different control timings, including the operation control signal, the parallel control signal, the driving/sensing control signal, the storage control signal, and the serial connection control. Signal. As shown in FIG. 1 , each of the operational control modules 40 includes a positive input terminal 410 , a negative input terminal 420 , and an output terminal 430 . The operation control module 40 operates the two voltages received from the positive input terminal 410 and the negative input terminal 420 according to the operation control signal, and outputs the calculated analog data through the output terminal 430. In practical applications, the analog data is the sensing voltage, but not limited thereto.

In addition, the storage control module 50 is coupled to the logic control module 10 and the arithmetic control module 40. Each of the storage control modules 50 includes a plurality of storage capacitors 500 and one end of each storage capacitor 500 is coupled to each other. The storage control module 50 evenly distributes the residual charges in the storage capacitors 500 according to the parallel control signals, so that each storage capacitor 500 stores the same storage voltage. It should be noted that the storage control module 50 stores the analog data in different storage capacitors 500 at the same time point, so that the analog data can be simultaneously sensed.

As shown in FIG. 1 , the driving/sensing control module 30 is coupled to the logic control module 10 and the pins 20 for controlling the pins 20 to execute a plurality of pins respectively according to the driving/sensing control signals. The function is such that the pins 20 can sense the first sensing voltage and the second sensing voltage from the first sensing line L1 and the second sensing line L2 of the conductive film sensor 2, respectively. It is worth noting that the pin functions include sensing, driving, ground, and floating. That is, the pins 20 included in the touch sensing device 1A not only have a single function, but can be switched between different functions according to actual needs, but are not limited thereto.

In practical applications, the logic control module 10 can also generate the control signals having different control timings according to the external synchronization signals, so that the pins 20 can avoid the time zone in which the display panel generates noise when sensing. Of course, the logic control module 10 can also generate the control signals having different control timings according to the external synchronization signals, so that the pins 20 can avoid the time zone in which the display panel generates noise when sensing, thereby avoiding The noise of the display panel affects the analog data sensed by the pins 20.

It should be noted that each storage capacitor 500 stores the first sensing voltage according to the storage control signal, so that the voltage stored by the storage capacitor 500 is changed from the original storage voltage to the first sensing voltage. That is, the present invention eliminates the need to discharge the storage capacitor 500, thereby reducing the time during which the storage capacitor 500 is discharged, and enabling the storage capacitor 500 to continue to store the storage voltage. In addition, the present invention further utilizes the storage capacitor 500 in which the storage voltage is stored, so that when the storage capacitor 500 is charged, the stored voltage changes from the storage voltage to the first sensing voltage without restarting charging from zero voltage. The first sensing voltage saves power and reduces charging time.

As shown in FIG. 1 , the touch sensing device 1A further includes at least one parallel/series control module 60 . The parallel/series control module 60 is coupled to the logic control module 10 for sequentially outputting the analog data according to the serial control signal. It should be noted that the parallel/series control module 60 includes a plurality of parallel input terminals 610 and a series output terminal 620. The parallel/series control module 60 sequentially receives the analog data through the parallel input terminals 610, and respectively transmits the processed analog data to the analog/digital conversion module 70 via the serial output terminal 620. In a general case, the parallel/series control module 60 has a plurality of series output terminals 620, wherein each series output terminal 620 is coupled to a corresponding analog/digital conversion module 70, so a plurality of analog/digital conversion modes are required. Group 70. The parallel/series control module 60 of the present invention only has one series output terminal 620 to reduce the number of analog/digital conversion modules 70, thereby reducing the cost.

In addition, the analog/digital conversion module 70 is coupled to the logic control module 10 for converting analog data into digital data and outputting the digital data to the logic control module 10. In practical applications, the analog/digital conversion module 70 can be any type of analog/digital converter, and is not particularly limited. As shown in FIG. 1 , the logic control module 10 may further include a digital filtering unit 100 for performing digital filtering on the digital data to reduce noise of the digital data.

Please refer to FIG. 2. FIG. 2 is a detailed schematic diagram of the internal circuit of the touch sensing device 1A of the present invention. As shown in FIG. 2, the touch sensing device 1A includes the pins S1, S2, S3, and S4, the logic control module 10, the driving/sensing control module 30, the arithmetic control module 40, and the storage control module. 50. Parallel/series control module 60 and analog/digital conversion module 70. The driving/sensing control module 30 includes storage switches SW1, SW2, SW3, and SW4, grounding switches SW5 and SW6, and storage capacitors C1 and C2, wherein the storage switches SW1/SW2 are coupled to the pins S1/S2 and the storage capacitors, respectively. C1, the storage switch SW3/SW4 is respectively coupled to the pin S3/S4 and the storage capacitor C2. In other embodiments, the touch sensing device 1A can also include a plurality of driving/sensing control modules 30 and a plurality of corresponding other modules according to actual needs, so as to process multiple analog data, which is not an example. Limited.

As shown in FIG. 2, when the driving/sensing control module 30 receives the sensing control signal transmitted by the logic control module 10, the driving/sensing control module 30 controls the timing control according to the sensing control signal. The sensing functions are respectively performed on the pins S1 to S4, so that the pins S1 to S4 respectively sense the first sensing voltage, the second sensing voltage, the third sensing voltage and the fourth sensing voltage from the corresponding sensing lines. . In addition, the driving/sensing module 30 sequentially controls the storage switches SW1 SW SW4 to be turned off and controls the grounding switches SW5 and SW6 to be turned on, so that the first sensing voltage / the second sensing voltage and the third sensing voltage / fourth sensing The voltages are sequentially stored in the storage capacitors C1 and C2, respectively.

It should be noted that after the sensed data is stored in the storage capacitors C1 and C2, the conductive film sensor 2 performs a discharge process to avoid the residual charge on the conductive film sensor 2. Accuracy when sensing to pins S1~S4.

As shown in FIG. 2, the operation control module 40 includes arithmetic units 401 and 402, coupling switches SW7, SW8, and SW9 and a reference voltage 403. The arithmetic units 401 and 402 respectively include a positive input terminal 410, a negative input terminal 420, and an output. End 430. Taking the operation unit 401 as an example, when the logic control module 10 controls the storage switches SW1 and SW3, the grounding switches SW5 and SW6, and the coupling switches SW7 and SW9 to be turned on, and controls the coupling switch SW8 to be turned off, the first sensing voltage and The third sensing voltages are sequentially transmitted to the positive input terminal 410 and the negative input terminal 420 of the arithmetic unit 401, respectively. The operation control module 40 operates the two voltages received from the positive input terminal 410 and the negative input terminal 420 according to the operation control signal, and outputs the calculated analog data through the output terminal 430. In practical applications, the analog data is the sensing voltage. In addition, the computing units 401 and 402 can also be turned on by the coupling switches SW7 and SW8, respectively, and the coupling switch SW9 is turned off, so that the reference voltage 403 is transmitted to the negative input terminal 420. That is, the arithmetic control module 40 can control the coupling switches SW7 SW SW9 so that the negative input terminal 420 can receive the reference voltage 403 or other sensing voltage without particular limitation.

It should be noted that the touch sensing device 1A is turned on or off by the coupling switches, so that the computing unit 401 can also perform operations on the same sensing voltage. For example, when the logic control module 10 controls the storage switches SW1 and SW2, the coupling switch SW8, and the coupling switch SW9 to be turned on, and controls the coupling switch SW7 to be turned off, the first sensing voltage is transmitted to the positive input of the arithmetic unit 401. End 410 and negative input 420. The operation control module 40 operates the first sensing voltage received from the positive input terminal 410 and the negative input terminal 420 according to the operation control signal, and outputs the calculated analog data through the output terminal 430.

In this embodiment, the storage control module 50 is coupled to the output 430 of the operational control module 40. However, in other embodiments, the storage control module 50 can be coupled to the positive input terminal 410 or the negative input terminal 420 of the operational control module 40, and is not limited thereto. As shown in FIG. 2, the storage control module 50 includes storage switches SW10 and SW11, storage capacitors C3 and C4, and a serial switch SW12, wherein one ends of the storage capacitors C3 and C4 are coupled to each other via the serial switch SW12. It should be noted that the logic control module 10 controls the storage switches SW10 and SW11 to be turned off, and controls the serial switch SW12 to be turned on, so that the first sensing voltage and the third sensing voltage are stored in the storage capacitors C3 and C4, respectively.

As shown in FIG. 2, the parallel/series control module 60 includes a plurality of parallel input terminals 610, buffers A1 and A2, coupling switches SW13 and SW14, and a series output terminal 620. When the logic control module 10 controls the storage switches SW10 and SW11 to be turned on, the first sensing voltage and the third sensing voltage are respectively transmitted to the buffers A1 and A2 via the corresponding parallel input terminals 610. It should be noted that the storage control module 50 controls the serial switch SW12 to close and evenly distribute the residual charge in the storage capacitors C3 and C4 according to the parallel control signal, so that the storage capacitors C3 and C4 respectively store the same storage voltage.

In practical applications, the logic control module 10 controls the storage switches SW10 and SW11 to be turned off, and controls the serial switch SW12 to be turned on, so that the second sensing voltage and the fourth sensing voltage are stored in the storage capacitors C3 and C4, respectively. Since the storage capacitors C3 and C4 respectively have the same storage voltage, the voltages stored in the storage capacitors C3 and C4 are changed from the original storage voltage to the second sensing voltage and the fourth sensing voltage, respectively. That is, the present invention reduces the discharge time by omitting the operation of discharging the storage capacitors C3 and C4, and allows the storage capacitors C3 and C4 to store the storage voltage. Specifically, the present invention further utilizes the storage capacitors C3 and C4 in which the storage voltage is stored, so that when the storage capacitors C3 and C4 are charged, the stored voltage is changed from the storage voltage to the actual sensing voltage, thereby saving power and Reduce charging time.

In addition, the parallel/series control module 60 controls the coupling switches SW13 and SW14 according to the serial connection control signals to sequentially output the first sensing voltage to the fourth sensing voltage, and respectively respectively processes the processed analog data via the serial output terminal 620. Transfer to the analog/digital conversion module 70.

The analog/digital conversion module 70 is coupled to the logic control module 10 for converting the analog data into digital data and outputting the digital data to the logic control module 10. In practical applications, the analog/digital conversion module 70 can be any type of analog/digital converter, and is not particularly limited. As shown in FIG. 1 , the logic control module 10 further includes a digital filtering unit 100 for performing digital filtering on the digital data to reduce noise of the digital data.

Please refer to FIG. 3 . FIG. 3 is another schematic diagram of the touch sensing device 1B of the present invention for sensing the touch point of the conductive film sensor 2 . As shown in FIG. 3, the storage control module 50 is coupled to at least one of the positive input terminal 410 and the negative input terminal 420 of the operational control module 40, and is connected in parallel, as compared with the touch sensing device 1A of FIG. The / series control module 60 is disposed between the storage control module 50 and the arithmetic control module 40. The parallel/series control module 60 includes at least one parallel input terminal 610 and at least one serial output terminal 620. Referring to FIG. 2, the computing units 401 and 402 of the computing control module 40 are respectively coupled to the buffers A1 and A2 of the corresponding parallel/series control module 60, and the computing units 401 and 402 and the corresponding buffer A1 and A2 is a one-to-one configuration relationship. In contrast, in the touch sensing device 1B shown in FIG. 3 , the arithmetic control module 40 is coupled to the serial output terminal 620 of the parallel/series control module 60 . In the actual situation, the buffer and the arithmetic unit of the parallel/series control module 60 are in a many-to-one configuration relationship.

Please refer to FIG. 4. FIG. 4 is a detailed schematic diagram of another embodiment of the internal circuit of the touch sensing device 1B of the present invention. As shown in FIG. 4 , the storage control module 50 is coupled to at least one of the positive input terminal 410 and the negative input terminal 420 of the operational control module 40 , and the parallel/series control module 60 is disposed in the storage control module 50 . And between the arithmetic control modules 40. In addition, the parallel/series control module 60 includes at least one parallel input terminal 610, buffers A1 and A2, at least one serial output terminal 620, coupling switches SW15, SW16, SW17, SW18, SW9 and a reference voltage 403. It should be noted that the logic control module 10 controls the opening or closing of the coupling switches SW15~18 so that the analog data can be sequentially transmitted to the arithmetic unit 401. Specifically, since the buffers A1 and A2 of the parallel/series control module 60 and the arithmetic unit 401 are arranged in a many-to-one relationship, the number of the arithmetic units 401 can be reduced. Therefore, the touch sensing device 1B shown in FIG. 4 can not only improve the efficiency of the storage control module 50 but also reduce the cost by reducing the number of the computing unit 401.

The structure of the logic control module 10, the driving/sensing control module 30, the storage control module 50, and the analog/digital conversion module 70 is the same as that of the touch sensing device 1A of FIG. 2, and is not otherwise Narration.

Since the conventional touch sensing device discharges the residual charge of the storage capacitors included in the storage control module, such storage capacitors cannot store residual charges, so additional time and voltage are required to charge the storage capacitors. Therefore, compared with the prior art, the touch sensing device according to the present invention couples the storage capacitors included in the storage control module to each other, so that the storage control module can evenly distribute the residual charge of the storage capacitor. Since the discharge is not performed, the discharge time can be omitted. In addition, when the storage capacitor is being charged, the stored voltage changes from the storage voltage to the first sensing voltage, thereby reducing the charging time. Therefore, the touch sensing device of the present invention can distribute the residual charge by coupling the storage capacitors, thereby effectively eliminating the discharge time and reducing the charging time, thereby improving the efficiency.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

1A, 1B. . . Touch sensing device

2. . . Conductive film sensor

10. . . Logic control module

20. . . Pin

30. . . Drive/sense control module

40. . . Operation control module

50. . . Storage control module

60. . . Parallel/series control module

70. . . Analog/digital conversion module

80. . . Sensing line

90. . . Drive line

100. . . Digital filtering unit

401, 402. . . Arithmetic unit

403. . . Reference voltage

410. . . Positive input

420. . . Negative input

430. . . Output

L1. . . First sensing line

L2. . . Second sensing line

S1~S4. . . Pin

SW1~SW4. . . Storage switch

SW5, SW6. . . Grounding switch

SW7~SW9. . . Coupling switch

SW10, SW11. . . Storage switch

SW12. . . Serial switch

SW13~18. . . Coupling switch

A1, A2. . . buffer

C1, C2. . . Storage capacitor

C3, C4. . . Storage capacitor

500. . . Storage capacitor

610. . . Parallel input

620. . . Serial output

1 is a schematic diagram showing touch sensing of a conductive film sensor by a touch sensing device of the present invention;

2 is a detailed schematic diagram of internal circuits of the touch sensing device of the present invention;

3 is another schematic diagram of performing touch point sensing on a conductive film sensor by the touch sensing device of the present invention;

4 is another detailed schematic diagram of the internal circuit of the touch sensing device of the present invention.

1A. . . Touch sensing device

10. . . Logic control module

30. . . Drive/sense control module

40. . . Operation control module

50. . . Storage control module

60. . . Parallel/series control module

70. . . Analog/digital conversion module

100. . . Digital filtering unit

401, 402. . . Arithmetic unit

403. . . Reference voltage

410. . . Positive input

420. . . Negative input

430. . . Output

S1~S4. . . Pin

SW1~SW4. . . Storage switch

SW5, SW6. . . Grounding switch

SW7~SW9. . . Coupling switch

SW10, SW11. . . Storage switch

SW12. . . Serial switch

SW13~14. . . Coupling switch

A1, A2. . . buffer

C1, C2. . . Storage capacitor

C3, C4. . . Storage capacitor

610. . . Parallel input

620. . . Serial output

Claims (9)

A touch sensing device includes: a logic control module for generating a plurality of control signals with different control timings, the control signals including an operational control signal and a parallel control signal; at least one operational control module, each An operation control module includes a positive input terminal, a negative input terminal and an output terminal, and the operation control module performs operations on the two voltages received from the positive input terminal and the negative input terminal according to the operation control signal. And outputting the calculated analog data through the output terminal; at least one storage control module is coupled to the logic control module and the operation control module, and each of the storage control modules respectively includes a plurality of storage capacitors and each One of the storage capacitors is coupled to each other, and the storage control module evenly distributes the residual charges in the storage capacitors according to the parallel control signals, so that each storage capacitor stores the same storage voltage; a plurality of pins; At least one driving/sensing control module coupled to the logic control module and the pins for driving according to one of the control signals The test control signals control the pins to perform a plurality of pin functions respectively, so that the pins can respectively sense a first sensing voltage from one of the first sensing lines and the second sensing line of the conductive film sensor. And a second sensing voltage. The touch sensing device of claim 1, wherein the pin functions include a sensing function, a driving function, a grounding function, and a floating function. The touch sensing device of claim 1, wherein each storage capacitor stores the first sensing voltage according to one of the control signals, so that the voltage stored by the storage capacitor is The original storage voltage becomes the first sensing voltage. The touch sensing device of claim 1, further comprising: at least one parallel/series control module coupled to the logic control module for serially controlling one of the control signals The signal sequentially outputs a plurality of analog data. The touch sensing device of claim 4, further comprising: an analog/digital conversion module coupled to the logic control module for converting the analog data into a digital data, and The digital data is output to the logic control module. The touch sensing device of claim 1, wherein the positive input terminal receives the first sensing voltage, and the negative input terminal receives a reference voltage or the second sensing voltage. The touch sensing device of claim 1, wherein the storage control module is coupled to the output of the operational control module. The touch sensing device of claim 1, wherein the storage control module is coupled to at least one of the positive input terminal and the negative input terminal of the operational control module. The touch sensing device of claim 5, wherein the logic control The module further includes a digital filtering unit for performing digital filtering on the digital data to reduce noise of the digital data.