CN-121996097-A - Touch display device and driving method thereof

Abstract

A touch display device and a driving method thereof are disclosed. The touch display device includes a pixel configured to display an input image, a pixel driving circuit configured to write pixel data of the input image to the pixel, a touch and hover sensor configured to sense the touch input and the hover input, and a sensor driving circuit configured to drive the touch and hover sensor. The sensor drive circuitry couples sense lines connected to the touch and hover sensors to sense hover inputs and identify a user.

Inventors

• Jin Xunpei

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20250925

Priority Date

20241105

Claims (20)

1. 1. A touch display device, the touch display device comprising: A pixel configured to display an input image; A pixel driving circuit configured to write pixel data of the input image to the pixel; A touch and hover sensor configured to sense touch input and hover input, and A sensor drive circuit configured to drive the touch and hover sensor, Wherein the sensor drive circuit is configured to couple sense lines connected to the touch and hover sensors to sense the hover input and identify a user.
2. 2. The touch display device of claim 1, wherein, The touch and hover sensor includes: A plurality of first sensor electrodes connected to a plurality of first sensing lines parallel to each other, and A plurality of second sensor electrodes connected to a plurality of second sensing lines, the plurality of second sensing lines cross the first sensing lines and are parallel to each other, and Wherein the sensor driving circuit includes: A sensor driver configured to apply a driving signal to a capacitance of the touch and hover sensor and to sense an amount of charge or voltage change of the capacitance, and The sensor controller is provided with a sensor control unit, the sensor controller is configured to control the sensor driver.
3. 3. The touch display device of claim 2, wherein the sensor controller is configured to provide a reference drive signal to the sensor driver that directs the sensor driver to output the drive signal, a hover enable signal that directs hover sensing, and a user identification enable signal that directs user identification by the hover sensing.
4. 4. A touch display device according to claim 3, wherein the sensor driver is configured to output pulses of the drive signal in response to the reference drive signal, and the sensor driver is configured to vary at least one of a voltage and a frequency of the drive signal.
5. 5. The touch display device of claim 2, wherein the sensor driver comprises: a first driver configured to apply the drive signal to the sense line; a second driver including an amplifier to which a predetermined reference voltage or the driving signal is applied to a non-inverting terminal, and A switching circuit configured to connect the inverting terminals of the first driver and the amplifier to a corresponding first sense line or a corresponding second sense line.
6. 6. The touch display device of claim 3, wherein, The pixels are driven during a display interval; the touch and hover sensors are driven during a touch sensing interval, a hover sensing interval, and a user identification interval; Linking the sense lines by a predetermined number during the hover sensing interval, and A greater number of the sense lines are cross-linked identified during the user identification interval than during the hover sensing interval.
7. 7. The touch display device of claim 6, wherein voltages charged in the capacitances of the touch and hover sensors are sensed by hover sensing during the hover sensing interval and the user identification interval.
8. 8. The touch display device of claim 6, wherein a resolution of the hover input sensed during the hover sensing interval is lower than a resolution of the touch input sensed during the touch sensing interval.
9. 9. The touch display device of claim 8, wherein a resolution of the hover input sensed during the user identification interval is lower than the resolution of the hover input sensed during the hover sensing interval.
10. 10. The touch display device of claim 6, wherein one frame period of the touch display device includes the display interval, the touch sensing interval, the hover sensing interval, and the user identification interval.
11. 11. The touch display device of claim 6, wherein an nth frame period of the touch display device includes the display interval, the touch sensing interval, and the user identification interval, wherein N is a positive integer, and Wherein the n+1st frame period includes the display interval, the hover sensing interval, and a user identification interval.
12. 12. The touch display device of claim 6, wherein the touch and hover sensor is driven simultaneously with the pixel.
13. 13. The touch display device of claim 6, wherein an N-th frame period of the touch display device comprises a touch sensing interval and a user identification interval, the pixel and the touch and hover sensor being driven simultaneously in the touch sensing interval and the pixel and the touch and hover sensor being driven simultaneously in the user identification interval, wherein N is a positive integer, and The n+1th frame period includes a hover sensing interval in which the pixel and the touch and hover sensor are simultaneously driven and a user recognition interval in which the pixel and the touch and hover sensor are simultaneously driven.
14. 14. The touch display device of claim 13, wherein a vertical blanking period is provided between an nth frame period and an n+1th frame period, the pixel and the touch and hover sensor not being driven in the vertical blanking period.
15. 15. The touch display device according to claim 13, wherein the user recognition interval is set to be recognized in a vertical blanking period in which no pixel is driven during each of the nth and n+1th frame periods.
16. 16. The touch display device of claim 6, wherein one frame period of the touch display device includes a touch sensing interval, a hover sensing interval, and a user identification interval, the pixel and the touch and hover sensor are driven simultaneously in the touch sensing interval, the pixel and the touch and hover sensor are driven simultaneously in the hover sensing interval, and the pixel and the touch and hover sensor are driven simultaneously in the user identification interval.
17. 17. The touch display device of claim 13, wherein the user identification interval is set in a vertical blanking period in which no pixels are driven.
18. 18. A method of driving a touch display device, the method comprising: Driving the pixels to display an input image; Driving the touch and hover sensor to sense a touch input in a contact state on the touch screen; driving the touch and hover sensor to sense hover input in a non-contact state over the touch screen, and The touch and hover sensor is driven to identify a user attempting to make a touch and hover over the touch screen in a non-contact state.
19. 19. The method of claim 18, wherein the voltage charged in the capacitance of the touch and hover sensor is sensed by hover sensing during a hover sensing interval and a user identification interval.
20. 20. The method of claim 19, wherein a resolution of hover input sensed during the hover sensing interval is lower than a resolution of touch input sensed during a touch sensing interval, and The resolution of hover input sensed during the user identification interval is lower than the resolution of hover input sensed during the hover sensing interval.

Description

Touch display device and driving method thereof Technical Field The present disclosure relates to an apparatus, and in particular, for example, but not limited to, a display apparatus and a driving method thereof. Background Various electronic devices employ touch display devices that are capable of sensing user input (e.g., a finger or pen on their display) that serve as user interfaces, thereby enhancing user convenience. In recent years, touch recognition technology has been developed to enable hover sensing in a non-contact state and touch sensing on a screen of a touch display device. The touch display device may be designed to have partially different viewing angles, or it may employ a technique that allows the viewing angle to be variably controlled for each pixel region. For example, video content or visual information reproduced in a touch display device may be displayed to a user only in a narrow viewing angle range, or may be displayed to a plurality of users in a wide viewing angle range. With the market expansion of future vehicles (such as electric vehicles and automatic driving vehicles), demand for in-vehicle display devices is rapidly increasing. The screen of the in-vehicle display device may be implemented as a touch display device. In such an in-vehicle display apparatus, a technique of making the viewing angle portion of the screen different or changing the viewing angle of each pixel may be applied. It is necessary to grant screen control authority of the touch display device to a specific user. However, the touch recognition technology applied to the touch display device cannot distinguish users. Disclosure of Invention It is an object of the present disclosure to address the above-described needs and/or problems. The present disclosure provides a touch display device and a driving method thereof, which can distinguish users attempting touch/hover input. The problems solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. A display panel according to one embodiment includes a pixel configured to display an input image, a pixel driving circuit configured to write pixel data of the input image to the pixel, a touch and hover sensor configured to sense touch and hover input, and a sensor driving circuit configured to drive the touch and hover sensor. The sensor drive circuitry couples sense lines connected to the touch and hover sensors to sense hover inputs and identify a user. The touch and hover sensor can include a plurality of first sensor electrodes connected to a plurality of first sensing lines parallel to each other, and a plurality of second sensor electrodes connected to a plurality of second sensing lines intersecting the first sensing lines and parallel to each other. The sensor driving circuit may include a sensor driver configured to apply a driving signal to a capacitance of the touch and hover sensor and sense a change in charge or voltage of the capacitance, and a sensor controller configured to control the sensor driver. The sensor controller may provide a reference drive signal to the sensor driver that directs the sensor driver to output the drive signal, a hover enable signal to direct hover sensing, and a user identification enable signal to direct user identification. The sensor driver may output pulses of the driving signal in response to the reference driving signal and vary at least one of a voltage and a frequency of the driving signal. The sensor driver may include a first driver configured to apply a driving signal to a sensing line, a second driver including an amplifier to which a predetermined reference voltage or driving signal is applied to a non-inverting terminal of the amplifier, and a switching circuit configured to connect the first driver and the inverting terminal of the amplifier to a corresponding first sensing line or a corresponding second sensing line. The pixels may be driven during the display interval. The touch and hover sensors can be driven during a touch sensing interval, a hover sensing interval, and a user identification interval. The sense lines may be defined to be a predetermined number during the hover sensing interval. A greater number of sense lines may be defined during the user identification interval than during the hover sensing interval. During the hover sensing interval and the user identification interval, a voltage charged in the capacitance of the touch and hover sensor is sensed by hover sensing. The resolution of the hover input sensed during the hover sensing interval is lower than the resolution of the touch input sensed during the touch sensing interval. The resolution of the hover input sensed during the user identification interval may be lower than the resolution of the hover input sensed during the hover sensing interval. One frame period of the touch display device