KR-20260064274-A - SUBPIXEL AND DISPLAY DEVICE

KR20260064274AKR 20260064274 AKR20260064274 AKR 20260064274AKR-20260064274-A

Abstract

Embodiments of the present disclosure may provide a subpixel comprising two driving transistors capable of alternating driving in one subpixel by providing a subpixel comprising a pixel electrode, a light-emitting layer, and a common electrode, a first driving transistor in which the connection between a first driving voltage line and the pixel electrode is controlled according to a first gate voltage, and a second driving transistor in which the connection between a second driving voltage line and the pixel electrode is controlled according to a second gate voltage different from the first gate voltage.

Inventors

조현석
배상혁
한성수
김주홍

Assignees

엘지디스플레이 주식회사

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (18)

Multiple subpixels; Multiple data lines; and It includes multiple reference voltage lines, and Each of the above plurality of subpixels is, A light-emitting element comprising a pixel electrode, an intermediate layer, and a common electrode; A first driving transistor for driving the light-emitting element, which controls the connection between the second node and the third node according to the voltage applied to the first node; A first scan transistor that controls the connection between the first data line among the plurality of data lines and the first node according to the first scan signal; A first sensing transistor that controls the connection between the first reference voltage line among the plurality of reference voltage lines and the second node according to the first sensing signal; A first light-emitting control transistor that controls the connection between the first node and the fourth node according to a first light-emitting control signal; A second light-emitting control transistor that controls the connection between the second node and the fifth node according to the first light-emitting control signal; and A storage capacitor electrically connected between the fourth node and the fifth node; including The first gate node of the first light-emitting control transistor and the second gate node of the second light-emitting control transistor are connected, Display device.
In Article 1, A second driving transistor for driving the light-emitting element, which controls the connection between the seventh and eighth nodes according to the voltage applied to the sixth node; A second scan transistor that controls the connection between the second data line among the plurality of data lines and the sixth node according to the second scan signal; A second sensing transistor that controls the connection between the second reference voltage line among the plurality of reference voltage lines and the seventh node according to the second sensing signal; A third light-emitting control transistor that controls the connection between the sixth node and the fourth node according to a second light-emitting control signal; and It further includes a fourth light-emitting control transistor that controls the connection between the seventh node and the fifth node according to the second light-emitting control signal, and The third gate node of the third light-emitting control transistor and the fourth gate node of the fourth light-emitting control transistor are connected, Display device.
In Article 2, A data link line to which data voltage is applied; A sensing drive link line to which a sensing drive voltage is applied; Reference voltage link line to which a reference voltage is applied; Analog-to-digital converter; A read-out line connected to the above analog-to-digital converter; A first selection circuit that electrically connects one of the data link line and the sensing drive link line, and one of the first data line and the second data line; and A second selection circuit comprising one of the reference voltage link line and the lead-out line, and one of the first reference voltage line and the second reference voltage line, which electrically connects Display device.
In Paragraph 3, Includes a first driving period and a second driving period, During the first driving period mentioned above, The first selection circuit electrically connects the data link line and the first data line, and electrically connects the second data line from the sensing drive link line, and The second selection circuit electrically connects the reference voltage link line and the first reference voltage line, and electrically connects the lead-out line and the second reference voltage line. Display device.
In Paragraph 4, During the above second driving period, The first selection circuit electrically connects the data link line and the second data line, and electrically connects the first data line from the sensing drive link line, and The second selection circuit electrically connects the reference voltage link line and the second reference voltage line, and electrically connects the lead-out line and the first reference voltage line. Display device.
In Article 2, Includes a first driving period and a second driving period, During the first driving period mentioned above, As the first light emission control signal of a turn-on level voltage is supplied to the first gate node and the second gate node, the first light emission control transistor and the second light emission control transistor become turned on, and As the first light-emitting control transistor turns on, the first node and the fourth node are electrically connected, and as the second light-emitting control transistor turns on, the second node and the fifth node are electrically connected, and As the second light emission control signal of a turn-off level is supplied to the third gate node and the fourth gate node, the third light emission control transistor and the fourth light emission transistor become turned off, and As the third light-emitting control transistor is turned off, the sixth node and the fourth node are electrically disconnected, and as the fourth light-emitting control transistor is turned off, the seventh node and the fifth node are electrically disconnected. Display device.
In Article 6, During the above second driving period, As the second light emission control signal of a turn-on level is supplied to the third gate node and the fourth gate node, the third light emission control transistor and the fourth light emission control transistor become turned-on, and As the third light-emitting control transistor turns on, the sixth node and the fourth node are electrically connected, and as the fourth light-emitting control transistor turns on, the seventh node and the fifth node are electrically connected, and As the first light emission control signal of a turn-off level is supplied to the first gate node and the second gate node, the first light emission control transistor and the second light emission control transistor become turned off, and As the first light-emitting control transistor turns off, the first node and the fourth node are electrically disconnected, and as the second light-emitting control transistor turns off, the second node and the fifth node are electrically disconnected. Display device.
In Article 7, During the first driving period mentioned above, As a second scan signal of a turn-on level is supplied to the gate node of the second scan transistor, the second scan transistor becomes turned on, and As the second scan transistor turns on, a second sensing driving voltage is supplied from the second data line to the sixth node, and During the above second driving period, As a first scan signal of a turn-on level is supplied to the gate node of the first scan transistor, the first scan transistor becomes turned on, and As the first scan transistor is turned on, a first sensing driving voltage is supplied from the first data line to the first node, Display device.
In Article 7, During the first driving period mentioned above, As a second sensing signal of a turn-on level is supplied to the gate node of the second sensing transistor, the second sensing transistor becomes turned on, and As the second sensing transistor turns on, voltage is applied from the seventh node to the second reference voltage line, and During the above second driving period, As a first sensing signal of a turn-on level is supplied to the gate node of the first sensing transistor, the first sensing transistor becomes turned on, and As the first sensing transistor turns on, voltage is applied from the second node to the first reference voltage line, display device
In Article 7, The above first driving period includes a third driving period and a fourth driving period, and During the above third driving period, As the first scan signal of a turn-on level voltage is supplied to the gate node of the first scan transistor, the first scan transistor becomes turned on, and As the first scan transistor turns on, a first data voltage is supplied from the first data line to the first node, and As the first sensing signal of a turn-on level voltage is supplied to the gate node of the first sensing transistor, the first sensing transistor becomes turned on, and As the first sensing transistor turns on, a second reference voltage is supplied to the second node from the first reference voltage line, and During the above fourth driving period, As the first scan signal of a turn-off level voltage is supplied to the gate node of the first scan transistor, the first scan transistor becomes turned off, and As the first sensing signal of a turn-off level voltage is supplied to the gate node of the first sensing transistor, the first sensing transistor becomes turned off, and As the first scan transistor and the first sensing transistor become turned off, the first node and the second node become electrically floating. Display device.
In Article 7, The above second driving period includes a fifth driving period and a sixth driving period, and During the above fifth driving period, As the second scan signal of the turn-on level voltage is supplied to the gate node of the second scan transistor, the second scan transistor becomes turned on, and As the second scan transistor turns on, a second data voltage is supplied from the second data line to the sixth node, and As the second sensing signal of the turn-on level voltage is supplied to the gate node of the second sensing transistor, the second sensing transistor becomes turned on, and As the second sensing transistor turns on, a second reference voltage is supplied to the seventh node from the second reference voltage line, and During the above 6th driving period, As the second scan signal of the turn-off level voltage is supplied to the gate node of the second scan transistor, the second scan transistor becomes turned off, and As the second sensing signal of a turn-off level voltage is supplied to the gate node of the second sensing transistor, the second sensing transistor becomes turned off, and As the second scan transistor and the second sensing transistor are turned off, the sixth node and the seventh node become electrically floating. Display device.
1st subpixel; A first data line connected to the first subpixel above; A second data line connected to the first subpixel above; A first reference voltage line connected to the first subpixel; A second reference voltage line connected to the first subpixel above; A data link line to which data voltage is applied; A sensing drive link line to which a voltage for sensing drive is applied; and A display device comprising one of the data link line and the sensing drive link line, and a first selection circuit that electrically connects one of the first data line and one of the second data line.
In Paragraph 12, Reference voltage link line to which a reference voltage is applied; Analog-to-digital converter; A lead-out line connected to the above analog-to-digital converter; and A display device comprising one of the reference voltage link line and one of the lead-out line, and a second selection circuit that electrically connects one of the first reference voltage line and one of the second reference voltage line.
In Article 12, The above first subpixel is, A light-emitting element comprising a pixel electrode, an intermediate layer, and a common electrode; A first driving transistor for driving the light-emitting element, which controls the connection between the second node and the third node according to the voltage applied to the first node; A first scan transistor that controls the connection between the first data line among the plurality of data lines and the first node according to the first scan signal; A first sensing transistor that controls the connection between the first reference voltage line among the plurality of reference voltage lines and the second node according to the first sensing signal; A first light-emitting control transistor that controls the connection between the first node and the fourth node according to a first light-emitting control signal; A second light-emitting control transistor that controls the connection between the second node and the fifth node according to the first light-emitting control signal; and It includes a storage capacitor electrically connected between the fourth node and the fifth node, and The first gate node of the first light-emitting control transistor and the second gate node of the second light-emitting control transistor are connected, Display device.
In Article 12, The above first subpixel is, A light-emitting element comprising a pixel electrode, a light-emitting layer, and a common electrode; A first driving transistor in which the connection between the first driving voltage line and the pixel electrode is controlled according to the first gate voltage; and A second driving transistor comprising a second driving voltage line and a pixel electrode whose connection is controlled according to a second gate voltage different from the first gate voltage, Display device.
A light-emitting element comprising a pixel electrode, a light-emitting layer, and a common electrode; A first driving transistor in which the connection between the first driving voltage line and the pixel electrode is controlled according to the first gate voltage; and A subpixel comprising a second driving transistor in which the connection between the second driving voltage line and the pixel electrode is controlled according to a second gate voltage different from the first gate voltage.
In Article 16, A first light-emitting control transistor connected between the first driving transistor and the pixel electrode, which becomes turned on or turned off according to a first light-emitting control signal; A second light-emitting control transistor having a second gate node connected to a first gate node of the first light-emitting control transistor, and becoming turned on or turned off according to the first light-emitting control signal; A third light-emitting control transistor connected between the second driving transistor and the pixel electrode, which becomes turned on or turned off according to a second light-emitting control signal; A second light-emitting control transistor having a fourth gate node connected to a third gate node of the third light-emitting control transistor, and further comprising a second light-emitting control transistor that becomes turned on or turned off according to the second light-emitting control signal. Subpixel.
In Article 17, Includes a first driving period and a second driving period, During the first driving period, a first data voltage is applied to the fifth gate node from a first data line electrically connected to the fifth gate node of the first driving transistor, and a second sensing driving voltage is applied to the sixth gate node from a second data line electrically connected to the sixth gate node of the second driving transistor, and During the second driving period, a first sensing driving voltage is applied from the first data line to the fifth gate node, and a second data voltage is applied from the second data line to the sixth gate node. Subpixel.

Description

Subpixel and Display Device The embodiments of the present disclosure relate to subpixels and display devices. Organic light-emitting displays, which have recently been gaining attention as display devices, utilize self-emissive Organic Light Emitting Diodes (OLEDs), offering advantages such as fast response speed, high luminous efficiency, brightness, and viewing angle. The driving transistors within each subpixel of such organic light-emitting display devices degrade as the driving time increases, and characteristic values such as threshold voltage and mobility may change. In addition, organic light-emitting diodes also undergo degradation as driving time increases, which can cause characteristic values such as threshold voltage to change, and since the degree of degradation may differ between organic light-emitting diodes, deviations in characteristic values may occur between organic light-emitting diodes within each subpixel. Accordingly, a method is required to compensate for characteristic values between driving transistors and to compensate for characteristic values resulting from the degradation of organic light-emitting diodes. FIG. 1 is a system configuration diagram of a display device according to embodiments of the present disclosure. FIG. 2 is a first selection circuit and a second selection circuit of a display device according to embodiments of the present disclosure. FIG. 3 is a subpixel of a display device according to embodiments of the present disclosure. FIG. 4 is a timing diagram of a display device according to embodiments of the present disclosure. FIG. 5 shows a third driving period during a first driving period in a method for driving a subpixel of a display device according to embodiments of the present disclosure. FIG. 6 shows a fourth driving period during a first driving period in a method for driving a subpixel of a display device according to embodiments of the present disclosure. FIG. 7 shows a fifth driving period during a second driving period in a method for driving a subpixel of a display device according to embodiments of the present disclosure. FIG. 8 shows a sixth driving period during the second driving period in a driving method of a subpixel of a display device according to embodiments of the present disclosure. 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 also be "connected," "combined," or "joined" with other components "intervened." Here, the other components may be included in one or more of the two or more components that are "connected," "combined," or "joined" with one another. In describing the temporal flow relationship regarding components, methods of operation, or methods of production, for example, when the temporal or sequential relationship is described using "after," "following," "next," or "before," it may include cases where the relationship is not continuous unless "immediately" or "directly" is used. Meanwhile, where numerical values or corresponding information regarding a component (e.g., levels, etc.) are mentioned, even without separate explicit notation, the numerical values or corresponding information may be interpreted as including a range of error that may occur due to various factors (e.g., process factors, internal or external shocks, noise, etc.). Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the attached drawings. FIG. 1 is a system configuration diagram of a display device (100) according to embodiments of the present disclosure. Referring to FIG. 1, a display device (100) according to embodiments of the present specification may include a display p