KR-20260063967-A - DISPLAY DEVICE AND DRIVING METHOD

Abstract

The embodiments of the present disclosure relate to a display device and a driving method thereof, and more specifically, the embodiments of the present specification include a first touch driving signal supply step in which a first touch electrode receives a first touch driving signal, a second touch electrode and a third touch electrode do not receive the first touch driving signal, and a fourth touch electrode receives a second touch driving signal, and a first touch sensing step in which sensing data is generated based on the difference between a first sensing value for the second touch electrode and a second sensing value for the third touch electrode, thereby enabling accurate detection of a touch operation by controlling noise.

Inventors

• 이득수
• 김태윤

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260507

Application Date

20241031

Claims (20)

1. A first touch driving signal supply step in which a first touch electrode receives a first touch driving signal, a second touch electrode and a third touch electrode do not receive the first touch driving signal, and a fourth touch electrode receives a second touch driving signal different from the first touch driving signal; A method for driving a display device comprising a first touch sensing step in which a touch circuit generates sensing data based on a difference value between a first sensing value for the second touch electrode and a second sensing value for the third touch electrode.
2. In paragraph 1, A driving method for a display device further comprising a second touch driving signal supply step in which a second touch electrode receives a first touch driving signal, the first touch electrode and the fourth touch electrode do not receive the first touch driving signal, and the third touch electrode receives the second touch driving signal.
3. In paragraph 1, A method for driving a display device comprising a second touch sensing step in which the touch circuit generates sensing data based on the second sensing value for the third touch electrode and the third sensing value for the fifth touch electrode.
4. In paragraph 1, A driving method for a display device further comprising a second touch driving signal supply step in which the first touch driving signal is supplied to the first touch electrode, the second touch electrode, the third touch electrode, and the fourth touch electrode.
5. In paragraph 4, A driving method for a display device in which, in a second touch driving signal supply step, a load-free driving signal identical to the first touch driving signal is supplied to a load-free driving electrode.
6. In paragraph 1, A driving method for a display device in which the phase of the first touch driving signal is in an inverse phase relationship with the phase of the second touch driving signal.
7. A first touch electrode receiving a first touch driving signal; A second touch electrode positioned spaced apart from the first touch electrode in a first direction; A third touch electrode positioned spaced apart from the first touch electrode in a second direction; A fourth touch electrode that receives a second touch driving signal different from the first touch driving signal, is positioned spaced apart from the second touch electrode in the second direction, and is positioned spaced apart from the third touch electrode in the first direction; and A touch circuit that generates sensing data based on the difference between a first sensing value for the second touch electrode and a second sensing value for the third touch electrode; A display device including
8. In Paragraph 7, A display device in which, when the ambient temperature of the display device changes, the first sensing value and the second sensing value each change.
9. In paragraph 8, When the ambient temperature of the above display device changes, A display device in which the above difference value does not change or changes to an amount less than the above change amount.
10. In Paragraph 7, It further includes a fifth touch electrode positioned spaced apart from the fourth touch electrode in the second direction, and The touch circuit generates the sensing data based on the difference between the first sensing value and the second sensing value during the first touch sensing period, and The touch circuit is a display device that generates sensing data based on the second sensing value for the third touch electrode and the third sensing value for the fifth touch electrode during a second touch sensing period different from the first touch sensing period.
11. In Paragraph 7, The above touch circuit is, A first differential amplifier that generates the above sensing data; and It further includes a first multiplexer electrically connected to the first differential amplifier, The above-mentioned first multiplexer is, A first input terminal electrically connected to the second touch electrode; A second input terminal electrically connected to the third touch electrode; A third input terminal electrically connected to a fifth touch electrode; A first output terminal electrically connected to the first differential amplifier; and A display device comprising a second output terminal electrically connected to the first differential amplifier.
12. In Paragraph 11, The period during which the above-mentioned first multiplexer is operated is A first period for electrically connecting the first input terminal to the first output terminal and electrically connecting the second input terminal to the second output terminal; and A display device comprising: a second period that electrically connects the second input terminal to the first output terminal and electrically connects the third input terminal to the second output terminal.
13. In Paragraph 11, The above touch circuit is, A fourth input terminal electrically connected to the fifth touch electrode; A fifth input terminal electrically connected to the third touch electrode; Sixth input terminal in a floating state; A third output terminal electrically connected to a second differential amplifier different from the first differential amplifier; and A display device further comprising a second multiplexer having a fourth output terminal electrically connected to the second differential amplifier.
14. In Paragraph 7, A display device in which the phase of the first touch driving signal is in an inverse phase relationship with the phase of the second touch driving signal.
15. In Paragraph 7, The period during which the above touch circuit operates is, A first touch driving period in which the first touch driving signal is supplied to the first touch electrode and the second touch driving signal is supplied to the fourth touch electrode; A second touch driving period in which the first touch driving signal is supplied to the first touch electrode, the second touch electrode, the third touch electrode, and the fourth touch electrode; and A display device comprising a third touch driving period in which the first touch driving signal is supplied to the second touch electrode and the second touch driving signal is supplied to the third touch electrode.
16. In paragraph 15, The above period during which the above touch circuit is operated is, A display device further comprising a first display period that proceeds between the first touch driving period and the second touch driving period.
17. In Paragraph 7, Substrate; A light-emitting element disposed on the above substrate; Row lines disposed on the light-emitting element; and It further includes an insulating layer disposed on the second electrode, The first to fourth touch electrodes are a display device disposed within the same metal layer as the row line.
18. In Paragraph 17, A display device comprising an insulating layer having an organic material having a dielectric constant that changes with changes in ambient temperature.
19. In Paragraph 17, A display device further comprising a driver disposed between the substrate and the light-emitting element and electrically connected to the row line.
20. A first touch electrode that receives a first touch driving signal during a first touch driving period and a second touch driving period different from the first touch driving period; A second touch electrode that does not receive the first touch driving signal during the first touch driving period and receives the first touch driving signal during the second touch driving period; A third touch electrode that does not receive the first touch driving signal during the first touch driving period and receives the first touch driving signal during the second touch driving period; and A fourth touch electrode that receives a second touch driving signal during a first touch driving period and receives the first touch driving signal during the second touch driving period; A display device including

Description

Display Device and Driving Method The embodiments of the present disclosure relate to a display device and a driving method. As the information society develops, the demand for display devices to display images is increasing in various forms, and recently, various display devices such as liquid crystal displays and organic light-emitting diodes (OLEDs) are being utilized. The display device may display images and may also detect touch actions. FIG. 1 shows a display device according to embodiments of the present specification. FIG. 2 is a plan view of a display device according to embodiments of the present specification. FIG. 3 is a plan view of a display panel according to embodiments of the present specification. FIG. 4 shows a subpixel of a display panel according to embodiments of the present specification. FIG. 5 is an equivalent circuit diagram of a unit driving area of a display panel according to embodiments of the present specification. FIG. 6 shows a driving timing diagram for n row lines and 1 column line included in the first sub-driving area of a display panel according to embodiments of the present specification. FIGS. 7 and 8 show circuits for driving n light-emitting elements connected to one column line included in a first sub-driving area of a display panel according to embodiments of the present specification. FIG. 9 is a plan view of a display panel according to embodiments of the present specification. FIG. 10 shows a unit driving area of a display panel according to embodiments of the present specification. FIGS. 11 and FIGS. 12 are plan views of a portion of a display panel according to embodiments of the present specification. FIG. 13 is a cross-sectional view of a display panel according to embodiments of the present specification. FIG. 14 is a detailed cross-sectional view of a display panel according to embodiments of the present specification, and is a cross-sectional view along the AB cutting line of FIG. 9. FIG. 15 is an enlarged cross-sectional view of a first subpixel of a display panel according to embodiments of the present specification. FIG. 16 is a diagram briefly illustrating the touch sensing structure of a display device according to embodiments of the present specification. FIG. 17 shows a touch sensing system of a display device according to embodiments of the present specification. FIG. 18 shows a touch driving structure of a display panel according to embodiments of the present specification. FIG. 19 is a plan view of a display panel according to embodiments of the present specification. FIG. 20 is a cross-sectional view of a display panel according to embodiments of the present specification. FIG. 21 is a graph of sensing data during a touch operation according to embodiments of the present specification. FIG. 22 is a driving timing diagram of a display device according to embodiments of the present specification. FIG. 23 shows signals according to the driving timing of a display device according to embodiments of the present specification. FIG. 24 is a diagram of signals supplied to a plurality of touch electrodes during a touch driving period according to embodiments of the present specification. FIGS. 25 and FIGS. 26 are exemplary diagrams of differential sensing according to embodiments of the present specification. FIG. 27 is a flowchart of a method for driving a display device according to embodiments of the present specification. FIGS. 28 and FIGS. 28 show the state of a subpixel according to the operation mode of a display device according to embodiments of the present specification. Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known components or functions may obscure the essence of the present disclosure, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts may be added unless "only" is used. Where a component is expressed in the singular, it may include a plural unless there is a special explicit description otherwise. Additionally, terms such as first, second, A, B, (a), (b), etc., may be used to describe the components of the present disclosure. These terms are used merely to distinguish the components from other components, and the nature, order, sequence, or number of the components are not limited by such terms. In describing the positional relationship of components, where it is stated that two or more components are "connected," "combined," or "joined," it should be understood that while the two or more components may be directly "connected," "combined," or "joined," they may