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CN-121999729-A - Driving circuit and operation method thereof

CN121999729ACN 121999729 ACN121999729 ACN 121999729ACN-121999729-A

Abstract

The invention provides a driving circuit suitable for knob equipment and an operation method thereof. The driving circuit comprises a plurality of touch sensing electrodes and a control circuit. The knob device includes a knob and a touch panel. The knob is arranged on the touch panel. The touch sensing electrodes and the control circuit are arranged in the touch panel. The touch sensing electrodes are coupled with the pixel switches in the touch control panel. The control circuit is coupled to the touch sensing electrodes. The control circuit provides a bias voltage to a first touch sensing electrode of the plurality of touch sensing electrodes during the touch period, so that a first pixel switch coupled to the first touch sensing electrode is kept turned off according to the touch control signal and the bias voltage. In this way, the driving circuit can avoid abnormality of the visual effect of the knob device during the touch period.

Inventors

  • LIN WUWEI

Assignees

  • 联咏科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (16)

  1. 1. A drive circuit, characterized in that is applicable to knob equipment, knob equipment includes knob and touch panel, the knob sets up on the touch panel, includes: a plurality of touch sensing electrodes disposed in the touch panel and coupled to a plurality of pixel switches in the touch panel, and The control circuit is arranged in the touch panel, coupled with the plurality of touch sensing electrodes, and used for providing bias voltage to a first touch sensing electrode in the plurality of touch sensing electrodes in a touch period so that a first pixel switch coupled with the first touch sensing electrode is kept to be turned off according to a touch control signal and the bias voltage.
  2. 2. The driver circuit according to claim 1, wherein the control circuit supplies the bias voltage in accordance with characteristics of the plurality of pixel switches.
  3. 3. The driving circuit of claim 1, wherein the first pixel switch is a transistor, In the touch period, the control end of the transistor receives the touch control signal, and the first end of the transistor receives the bias voltage and the liquid crystal electrode voltage in the touch panel, so that the voltage difference between the control end and the first end of the transistor is smaller than the threshold voltage value of the transistor.
  4. 4. The drive circuit of claim 1, wherein the bias voltage is a dc voltage and has a voltage value greater than 0 volts.
  5. 5. The driving circuit of claim 1, wherein the control circuit is further configured to provide a touch driving signal to a second touch sensing electrode of the plurality of touch sensing electrodes during the touch period, such that a second pixel switch coupled to the second touch sensing electrode remains turned off according to the touch control signal and the touch driving signal.
  6. 6. The driving circuit as recited in claim 5, wherein said second pixel switch is a transistor, In the touch period, the control end of the transistor receives the touch control signal, and the first end of the transistor receives the touch driving signal and the liquid crystal electrode voltage in the touch panel, so that the voltage difference between the control end and the first end of the transistor is smaller than the threshold voltage value of the transistor.
  7. 7. The driving circuit of claim 5, wherein the bias voltage is a combination of a dc voltage and an inverse of the touch driving signal.
  8. 8. The driving circuit according to claim 5, wherein the touch driving signal is one of a sine wave signal, a square wave signal, and a triangular wave signal.
  9. 9. A method of operating a drive circuit, characterized by being applied to a knob device including a knob and a touch panel on which the knob is disposed, the method of operating comprising: Providing a bias voltage to a first touch sensing electrode of a plurality of touch sensing electrodes in a touch period through a control circuit, wherein the plurality of touch sensing electrodes and the control circuit are arranged in the touch panel, and the plurality of touch sensing electrodes are coupled with a plurality of pixel switches in the touch panel, and And in the touch period, the control circuit keeps turning off the first pixel switch coupled with the first touch sensing electrode according to a touch control signal and the bias voltage.
  10. 10. The method of operation of claim 9, further comprising: the bias voltage is provided by the control circuit according to characteristics of the plurality of pixel switches.
  11. 11. An operating method according to claim 9 wherein the first pixel switch is a transistor, the operating method further comprising: receiving the touch control signal in the touch period through the control terminal of the transistor, and The bias voltage and the liquid crystal electrode voltage in the touch panel are received in the touch period through the first end of the transistor, so that the voltage difference between the control end and the first end of the transistor is smaller than the threshold voltage value of the transistor.
  12. 12. The method of operation of claim 9, wherein the bias voltage is a dc voltage and has a voltage value greater than 0 volts.
  13. 13. The method of operation of claim 9, further comprising: Providing a touch driving signal to a second touch sensing electrode of the plurality of touch sensing electrodes during the touch period by the control circuit, and And in the touch period, the control circuit keeps turning off the second pixel switch coupled with the second touch sensing electrode according to the touch control signal and the touch driving signal.
  14. 14. An operating method according to claim 13 wherein the second pixel switch is a transistor, the operating method further comprising: receiving the touch control signal in the touch period through the control terminal of the transistor, and And receiving the touch driving signal and the liquid crystal electrode voltage in the touch panel in the touch period through the first end of the transistor so that the voltage difference between the control end and the first end of the transistor is smaller than the threshold voltage value of the transistor.
  15. 15. The method of claim 13, wherein the bias voltage is a combination of a dc voltage and an inverse of the touch drive signal.
  16. 16. The method of operation of claim 13, wherein the touch drive signal is one of a sine wave signal, a square wave signal, a triangle wave signal.

Description

Driving circuit and operation method thereof Technical Field The present invention relates to an electronic circuit, and more particularly, to a driving circuit suitable for a knob device and an operating method thereof. Background In general, a knob is suitable for various electronic devices. For example, the knob may be applied to an in-vehicle center control screen (Center Information Display, CID). Current in-vehicle center control screens provide a driver to touch a knob to achieve a corresponding function, such as temperature adjustment. However, during the touch operation, the pixel component of the in-vehicle center control screen may leak, so that the visual effect of the in-vehicle center control screen may be abnormal (e.g., ghost). Disclosure of Invention The embodiment of the invention provides a driving circuit suitable for knob equipment, which can avoid abnormal visual effect of the knob equipment in the touch period. The driving circuit of the embodiment of the invention comprises a plurality of touch sensing electrodes and a control circuit. The knob device includes a knob and a touch panel. The knob is arranged on the touch panel. The plurality of touch sensing electrodes are disposed in the touch panel. The touch sensing electrodes are coupled with the pixel switches in the touch control panel. The control circuit is disposed in the touch panel. The control circuit is coupled to the touch sensing electrodes. The control circuit is used for providing bias voltage to a first touch sensing electrode in the plurality of touch sensing electrodes in the touch period, so that a first pixel switch coupled with the first touch sensing electrode is kept to be turned off according to the touch control signal and the bias voltage. The embodiment of the invention also provides an operation method of the driving circuit. The operating method is applicable to knob devices. The knob device includes a knob and a touch panel. The knob is arranged on the touch panel. The operation method comprises the following steps. During the touch period, the control circuit provides a bias voltage to a first touch sensing electrode of the plurality of touch sensing electrodes. The touch sensing electrodes and the control circuit are arranged in the touch panel. The touch sensing electrodes are coupled with the pixel switches in the touch control panel. The control circuit is used for maintaining to turn off the first pixel switch coupled with the first touch sensing electrode according to the touch control signal and the bias voltage in the touch period. Based on the above, in the touch period, the driving circuit and the operation method thereof according to the embodiments of the present invention provide the bias voltage to the touch sensing electrode through the control circuit, so that the pixel switch coupled to the touch sensing electrode can be maintained in the turned-off state based on the bias voltage, thereby avoiding the occurrence of the leakage of the pixel switch. In this way, the driving circuit can avoid abnormality of the visual effect of the knob device during the touch period. In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. Drawings FIG. 1 is a block diagram of a driving circuit according to an embodiment of the invention; FIG. 2 is a flow chart of a method of operating a driving circuit according to an embodiment of the invention; FIG. 3 is a block diagram of a knob device to which the driving circuit according to an embodiment of the present invention is applied; FIG. 4 is a schematic diagram illustrating the operation of the knob device according to the embodiment of FIG. 3; FIG. 5A and FIG. 5B are circuit block diagrams of a driving circuit according to an embodiment of the invention; FIG. 6 is a schematic diagram illustrating the operation of the driving circuit according to the embodiment of FIG. 5B of the present invention; FIG. 7 is a schematic diagram illustrating the operation of the driving circuit according to the embodiment of FIG. 5B of the present invention; FIG. 8 is a schematic diagram illustrating the operation of the driving circuit according to the embodiment of FIG. 5B. Description of the reference numerals 10. 40, Knob equipment; 100. 300, 500A, 500B; 110. 410, a touch panel; 111a to 111N, 311a, 311b, 511a, 511 b; 121a to 122N, 122M, 521a, 521 b; 130. 330, 530a, 530 b; 411 glass substrate; 412a color filter glass layer; 413 a polarizer layer; 414, an optical adhesive layer; 415, glass cover plate; 421a, 421 b; 531 a signal transmission circuit; 532 an amplifying circuit; 532a an operational amplifier; 532b current source; 532c, dependent current source; 533 a signal processing circuit; 533a anti-aliasing filter; 533b analog-to-digital converter; CS 1-CS 2, an induction capacitor; DL 1-DL 2, data lines; FD, display period; FT is a touch period; GL1, gate line; L