KR-20260066966-A - TOUCH DISPLAY DEVICE AND DRIVING METHOD THEREOF

Abstract

A touch display device and a method for driving the same are disclosed. The touch display device includes pixels that display an input image; a pixel driving circuit that writes pixel data of the input image to the pixels; touch and hover sensors that sense touch and hover inputs; and a sensor driving circuit that drives the touch and hover sensors. The sensor driving circuit binds sensing lines connected to the touch and hover sensors to sense the hover input and identify the user.

Inventors

• 김훈배

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (20)

1. Pixels displaying the input image; A pixel driving circuit that writes pixel data of the input image to the pixels; Touch and hover sensors for sensing touch and hover inputs; and It includes a sensor driving circuit that drives the touch and hover sensors, and A touch display device in which the sensor driving circuit binds sensing lines connected to the touch and hover sensors to sense the hover input and identify the user.
2. In Article 1, The above touch and hover sensors are, First sensor electrodes connected to each of a plurality of first sensing lines parallel to one another; It includes a plurality of second sensor electrodes connected to each of a plurality of second sensing lines that intersect the first sensing lines and are parallel to each other, and The above sensor driving circuit is, A sensor driving unit that applies a driving signal to the capacitance of the touch and hover sensors and senses the charge or voltage change amount of the capacitance; and A touch display device comprising a sensor control unit that controls the sensor driving unit.
3. In Article 2, A touch display device in which the sensor control unit provides the sensor driving unit with a reference driving signal that directs the output of the driving signal, a hover enable signal that directs hover sensing, and a user identification enable signal that directs user identification by hover sensing.
4. In Article 2, A touch display device wherein the sensor driving unit outputs a pulse of the driving signal in response to the reference driving signal and varies one or more of the voltage and frequency of the driving signal.
5. In Article 2, The above sensor driving unit A first driving unit that applies the above driving signal to the sensing lines; A second driving unit comprising an amplifier to which a predetermined reference voltage or the driving signal is applied to a non-inverting terminal; and A touch display device comprising a switching circuit that connects the inversion terminal of the first driving unit and the amplifier to a corresponding first sensing line or a corresponding second sensing line.
6. In Paragraph 3, The above pixels are driven during the display period, and During the touch sensing period, the hover sensing period, and the user identification period, the touch and hover sensors are operated, and In the above hover sensing section, the above sensing lines are formed in a predetermined number, and A touch display device in which the sensing lines are bound to the user identification section in greater numbers than the hover sensing section.
7. In Article 6, A touch display device in which charges and voltages charged in the capacitances of the touch and hover sensors are sensed by hover sensing during the hover sensing period and the user identification period.
8. In Article 6, A touch display device in which the resolution of a hover input sensed in the above hover sensing section is lower than the resolution of a touch input sensed in the above touch sensing section.
9. In Article 7, A touch display device in which the resolution of the hover input sensed in the above user identification section is lower than the resolution of the hover input sensed in the above hover sensing section.
10. In Article 6, A touch display device wherein one frame period of the touch display device comprises the display interval, the touch sensing interval, the hover sensing interval, and the user identification interval.
11. In Article 6, The Nth (N is a positive integer) frame period of the touch display device includes the display period, the touch sensing period, and the user identification period, and A display device comprising the N+1 frame period, the display period, the hover sensing period, and the user identification period.
12. In Article 6, A display device in which the touch and hover sensors are driven simultaneously with the pixels.
13. In Article 6, The Nth (N is a positive integer) frame period of the touch display device includes a touch sensing period in which the pixels and the touch and hover sensors are driven simultaneously, and a user identification period in which the pixels and the touch and hover sensors are driven simultaneously. A display device comprising an N+1 frame period including a hover sensing period in which the pixels and the touch and hover sensors are driven simultaneously, and a user identification period in which the pixels and the touch and hover sensors are driven simultaneously.
14. In Article 13, A display device having a vertical blank section in which the pixels and the touch and hover sensors are not driven between the above Nth frame period and the above N+1th frame period.
15. In Article 13, A display device in which the user identification interval is set during a vertical blank period in which pixels are not driven during each of the Nth frame period and the N+1th frame period.
16. In Article 6, A display device comprising a 1 frame period of the touch display device, a touch sensing section in which the pixels and the touch and hover sensors are driven simultaneously, a hover sensing section in which the pixels and the touch and hover sensors are driven simultaneously, and a user identification section in which the pixels and the touch and hover sensors are driven simultaneously.
17. In Article 13, A display device in which the above user identification interval is set during a vertical blank period in which pixels are not driven.
18. Step of driving pixels to display an input image; A step of driving touch and hover sensors to sense a touch input in a contact state on a touch screen; A step of driving the touch and hover sensors to sense a non-contact hover input on a touch screen; and A method for driving a touch display device, comprising the step of driving the touch and hover sensors to identify a user attempting to touch and hover in a non-contact state on a touch screen.
19. In Article 18, A method for driving a touch display device, wherein charge and voltage charged in the capacitance of the touch and hover sensors are sensed by hover sensing during the hover sensing period and the user identification period.
20. In Article 18, The resolution of the hover input sensed in the above hover sensing section is lower than the resolution of the touch input sensed in the above touch sensing section, and A method for driving a touch display device in which the resolution of a hover input sensed in the above user identification section is lower than the resolution of a hover input sensed in the above hover sensing section.

Description

Touch display device and driving method thereof The present invention relates to a touch display device and a method for driving the same. Touch display devices capable of sensing user finger or pen input are being applied to displays used as user interfaces in various electronic devices, thereby improving user convenience. Recently, touch recognition technology has been advanced to enable not only touch sensing but also non-contact hover sensing on the screen of a touch display device. Technology may be applied in which the viewing angle of a touch display device is designed to be partially different or the viewing angle is variably controlled for each pixel area. For example, video content or visual information reproduced on the touch display device can be shown only to users within a narrow viewing angle range or to multiple users within a wide viewing angle range. As the market for future vehicles, such as electric and autonomous vehicles, expands, the demand for automotive display devices is surging. Automotive display screens can be implemented as touch display devices. In these automotive displays, technologies can be applied to design the viewing angle of the screen differently for specific areas or to vary the viewing angle of each individual pixel. It is necessary to grant screen control of a touch display device to a specific user. However, touch recognition technology applicable to touch display devices cannot distinguish users. FIG. 1 is a block diagram showing a touch display device according to one embodiment of the present invention. FIG. 2 is a circuit diagram schematically showing a pixel circuit according to one embodiment of the present invention. FIG. 3 is a drawing showing in detail touch sensors and a sensor driving unit according to an exemplary embodiment of the present invention. FIG. 4 is a diagram showing enable signals of touch and hover sensors according to one embodiment of the present invention. FIGS. 5A and FIGS. 5B are drawings illustrating a touch and hover sensing method using a mutual capacitance sensing method. FIGS. 6a and FIGS. 6b are drawings illustrating a touch and hover sensing method using magnetic capacitance connected to second sensor electrodes. FIGS. 7a and FIGS. 7b are drawings illustrating a touch and hover sensing method using magnetic capacitance connected to first sensor electrodes. FIG. 8 is a waveform diagram showing a touch display device and a driving method thereof according to an embodiment of the present invention. FIG. 9 is a diagram showing an example of a method for sensing touch input during a touch sensing period. Figure 10 is a diagram showing an example of a method for sensing hover input during a hover sensing period. Figure 11 is a diagram showing an example of a user identification method during a user identification period. FIG. 12 is a diagram showing an example of selectively restricting touch and hover inputs using user identification in a vehicle display device. FIG. 13 is a circuit diagram showing an example of the connection relationship between sensor electrodes and driving units in a mutual capacitance sensing method as in FIG. 9. FIG. 14 is a circuit diagram showing an example of the connection relationship between sensor electrodes and driving units in a mutual capacitance sensing method as in FIG. 10. FIGS. 15a and FIGS. 15b are circuit diagrams showing an example of the connection relationship between sensor electrodes and driving units in a mutual capacitance sensing method as in FIG. 11. FIGS. 16 to 20 are waveform diagrams showing a touch display device and a driving method thereof according to another embodiment of the present invention. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. The present invention is not limited to the embodiments disclosed below but may be implemented in various different forms; the embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the matters shown in the drawings. Throughout the specification, the same reference numerals refer to substantially the same components. Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions may unnecessarily obscure the essence of the present invention. Where terms such as “comprising,” “including,” “having,” “consisting of,” etc. are used in this specification, other parts may be added unless “~ only” is used. Where a componen