DE-102025139466-A1 - DISPLAY DEVICE

Abstract

A display device may include a substrate with a display area and a non-display area, pixel driver circuits provided in the display area, first electrodes connected to the pixel driver circuit, light-emitting devices electrically connected to the first electrodes, and second electrodes connected to the light-emitting devices. An image signal line is connected to a pixel driver circuit below the pixel driver circuits, the pixel driver circuit being configured to selectively connect the image signal line to either the first or the second electrodes.

Inventors

• HoonBae Kim
• Namyong Gong
• Sungchul Kim
• SunYeop KIM
• Sung-Jin Kang
• Jongsung KIM

Assignees

• LG DISPLAY CO., LTD.

Dates

Publication Date

20260513

Application Date

20250929

Priority Date

20241111

Claims (15)

1. Display device comprising: a substrate (110) containing a display area (AA) and a non-display area (NA); pixel driver circuits (PD) arranged in the display area (AA); first electrodes (CE1) connected to the pixel driver circuits (PD); light-emitting devices (ED) arranged on the first electrodes (CE1); and second electrodes (CE2) arranged on the light-emitting devices (ED), an image signal line (IL) connected to a pixel driver circuit (PD) from the pixel driver circuits (PD), and the pixel driver circuit (PD) configured to selectively connect the image signal line (IL) to either the first electrodes (CE1) or the second electrodes (CE2).
2. Display device according to Claim 1 , wherein at least two second electrodes (CE2) are connected from the second electrodes to the pixel driver circuit (PD) and are used as a touch electrode (TE).
3. Display device according to Claim 2 , wherein each of the at least two second electrodes (CE2) extends along a first direction of the substrate (110) and the at least two second electrodes (CE2) are spaced apart from each other along a second direction which differs from the first direction.
4. Display device according to Claim 2 or 3 , wherein when a cathode voltage is applied to one of the at least two second electrodes (CE2), light is emitted from the light-emitting devices (ED) connected to one of the at least two second electrodes (CE2) to which the cathode voltage is applied.
5. Display device according to Claim 2 , 3 or 4 , wherein, when the at least two second electrodes (CE2) are used as a contact electrode (TE), a contact driver signal is supplied to the at least two second electrodes (CE2) simultaneously.
6. Display device according to one of the preceding claims, wherein during a display period in which an image is displayed, image signals used to control the light-emitting devices (ED) are supplied to the pixel driver circuit (PD) via the image signal line (IL), and during a touch detection period in which a touch is detected, the touch detection signals transmitted by the second electrodes (CE2) are output to the image signal line (IL).
7. Display device according to any of the preceding claims, wherein the pixel driver circuit (PD) comprises: a cathode electrode driver section (420) configured to supply a cathode voltage or a touch driver signal to the second electrodes (CE2); a subpixel driver section (410) configured to supply anode voltages to the first electrodes (CE1); and a switching section (430) configured to connect the image signal line (IL) to the cathode electrode driver section (420) or the subpixel driver section (410).
8. Display device according to Claim 7 , wherein the switching section (430) comprises: a cathode voltage switch (431) connected between a cathode voltage supply section (500) configured to supply the cathode voltage and the cathode electrode driver section (420); an image signal switch (432) configured to connect the image signal line (IL) to the subpixel driver section (410) or to disconnect the image signal line (IL) from the subpixel driver section (410); and an operating mode switch (433) connected between the image signal line (IL) and a switch link line (CL) configured to connect the cathode voltage switch (431) to the cathode electrode driver section (420).
9. Display device according to one of the preceding claims, further comprising a cathode voltage supply section (500) configured to generate a cathode voltage to be supplied to the second electrodes (CE2) and to supply the cathode voltage to the pixel driver circuit (PD).
10. Display device according to one of the preceding claims, further comprising a display driver (200) configured to supply image signals to the image signal line (IL) or to detect a touch on the substrate (110) using touch detection signals transmitted from the second electrodes (CE2) via the image signal line (IL).
11. Display device according to Claim 10 , wherein the second electrodes (CE2) controlled by at least one pixel driver circuit (PD) form a touch electrode (TE), a touch detection period in which a Touch detection includes: a Contact Touch Detection Period (CTP), during which touch by an object coming into contact with the display area (AA) is detected, and a Hover Touch Detection Period (HTP), during which touch by an object that is spaced away from the display area (AA) is detected.
12. Display device according to Claim 11 , wherein in the contact touch detection period (CTP) the display driver (200) is configured to detect a touch on the touch electrode (TE) corresponding to a touch coordinate using touch detection signals received by the at least one pixel driver circuit (PD), and/or in the high-level touch detection period (HTP) the display driver (200) is configured to detect a touch on the touch electrode (TE) corresponding to a touch coordinate using touch detection signals received by a greater number of pixel driver circuits (PD) than the number of pixel driver circuits (PD) transmitting the touch detection signals during the contact touch detection period (CTP), and/or a size of a touch electrode (TE) recognized as a touch coordinate during the high-level touch detection period (HTP) is greater than a size of a touch electrode (TE) recognized during the contact touch detection period (CTP) is recognized as a touch coordinate.
13. Display device according to Claim 10 , 11 or 12 , wherein the display driver (200) comprises: an image signal generation section (240) configured to generate image signals; a touch detection section (230) configured to generate touch driver signals and to detect a touch on the substrate (110) using the touch detection signals received from the image signal lines (IL); a signal switching section (210) configured to connect the image signal lines (IL) to the image signal generation section (240) or the touch detection section (230); and a group switching section (220) provided between the signal switching section (210) and the touch detection section (230), wherein the signal switching section (210) preferably comprises signal switches (211) connected to the image signal lines (IL) and at least two of the signal switches (211) are connected to the group switching section (220) via a group line (GRL).
14. Display device according to Claim 13 , wherein at least two image signal lines (IL) connected to at least two of the signal switches (211) are connected to at least two pixel driver circuits (PD) below the pixel driver circuits (PD), and second electrodes (CE2) controlled by the at least two pixel driver circuits (PD) form a touch electrode (TE).
15. Display device according to Claim 14 , wherein the group switching section (220) comprises: at least two group switches (221a) connected to at least two group lines (GRL) connected to the signal switching section (210); and connecting switches (222) provided between the at least two group lines (GRL), and wherein each of the connecting switches (222) is provided between two adjacent group lines (GRL), wherein the touch detection section (230) preferably comprises at least two detection sections (231) connected to the at least two group switches (221a).

Description

This application claims priority over Korean patent application no. 10-2024-0159058 , submitted on November 11, 2024 in the Republic of Korea. BACKGROUND Technical field The present disclosure relates to a display device Discussion of related technology A display device is used in various electronic devices, such as televisions, mobile phones, laptops and tablets. Display devices include an organic light-emitting diode (OLED) display, which emits light itself, and a liquid crystal display (LCD), which requires a separate light source. Recently, a display device containing a light-emitting diode (LED) has attracted attention as a next-generation display device. The LED is made of an inorganic material, not an organic one. Consequently, a display device containing an LED has a faster illumination rate compared to a liquid crystal display or an organic light-emitting display, while offering excellent luminance and the ability to display an image with high luminance. SUMMARY OF THE REVELATION Accordingly, the disclosure is directed towards providing a display device that substantially prevents one or more problems arising from limitations and disadvantages of the prior art. The task is to provide a display device that can change the size of a touch electrode according to a touch coordinate depending on the type of touch to be detected. Additional advantages and features of the disclosure are partly set forth in the following description and partly become apparent to the average person skilled in the art upon examination of what follows, or can be learned from the practice of the disclosure. The tasks and other advantages of the disclosure can be realized and achieved through the structure, which is particularly emphasized both in the written description and in the accompanying drawings. The problem is solved by the features of the independent claims. Preferred embodiments are specified in the dependent claims. To achieve these and other advantages, and in accordance with the purpose of the disclosure as embodied herein and generally described, a display device is provided comprising a substrate containing a display area and a non-display area, pixel driver circuits arranged in the display area, first electrodes connected to the pixel driver circuits, light-emitting devices arranged on the first electrodes, and second electrodes arranged on the light-emitting devices, wherein an image signal line is connected to a pixel driver circuit, and wherein the pixel driver circuit is configured to selectively connect the image signal line to either the first electrodes or the second electrodes. In a very general aspect, a display device is provided comprising a substrate containing a display area and a non-display area; pixel driver circuits arranged in the display area; first electrodes connected to the pixel driver circuits; light-emitting devices arranged on the first electrodes; and second electrodes arranged on the light-emitting devices, wherein an image signal line is connected to a pixel driver circuit below the pixel driver circuits. The following are optional features that can be combined with the general aspect of disclosure alone, in combination, or in sub-combination. According to one or more embodiments, at least two second electrodes can be connected to the pixel driver circuit below the second electrodes and/or used as a touch electrode. According to one or more embodiments, each of the at least two second electrodes can extend along a first direction of the substrate. According to one or more embodiments, the at least two second electrodes can be arranged along a second direction that diverges from the The first direction differs, being spaced apart from each other. According to one or more embodiments, when a cathode voltage is applied to one of the at least two second electrodes, light can be emitted by light-emitting devices connected to one of the at least two second electrodes to which the cathode voltage is applied. According to one or more embodiments, if the at least two second electrodes are used as a touch electrode, a touch driver signal can be supplied to the at least two second electrodes simultaneously. According to one or more embodiments, during a display period in which an image is displayed, image signals used to control the light-emitting devices can be supplied to the pixel driver circuit via the image signal line. According to one or more embodiments, during a touch detection period in which a touch is detected, the touch detection signals transmitted by the second electrodes can be output to the image signal line. According to one or more embodiments, the pixel driver circuit may include a cathode electrode driver section that supplies a cathode voltage or a touch driver signal to the second electrodes; a subpixel driver section that supplies anode voltages to the first electrodes; and a switching section that connects the image signal line to the cathode electrode driver section or