KR-20260065074-A - PIXEL DRIVING CIRCUIT, ELECTRONIC DEVICE INCLUDING THE SAME, AND ELECTRONIC DEVICE DRIVING METHOD

KR20260065074AKR 20260065074 AKR20260065074 AKR 20260065074AKR-20260065074-A

Abstract

A method for driving an electronic device according to an embodiment of the present invention, comprising a pixel driving circuit including a driving transistor, a switching transistor receiving a data voltage, and a light-emitting element, and a display panel operating with a first luminance characteristic and a second luminance characteristic having a luminance lower than the first luminance characteristic at 255 grayscale levels, wherein a first initialization voltage is provided to the gate electrode of the driving transistor and a second initialization voltage is provided to the light-emitting element, may include the steps of: determining the initialization voltage provided to the gate electrode by searching; determining the first initialization voltage by compensating the initialization voltage based on a predetermined margin voltage; determining the second initialization voltage based on the first initialization voltage and a predetermined driving condition; and providing the first initialization voltage and the second initialization voltage to the display panel.

Inventors

엄철환
강도영
강현웅

Assignees

삼성디스플레이 주식회사

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (20)

A driving method for an electronic device comprising a pixel driving circuit including a driving transistor, a switching transistor receiving a data voltage, and a light-emitting element, and a display panel operating with a first luminance characteristic and a second luminance characteristic having a luminance lower than the first luminance characteristic at 255 grayscale levels, wherein a first initialization voltage is provided to the gate electrode of the driving transistor and a second initialization voltage is provided to the light-emitting element. A step of searching for and determining an initialization voltage provided to the gate electrode in the first luminance characteristic; A step of determining the first initialization voltage by compensating the initialization voltage based on a predetermined margin voltage; A step of determining a second initialization voltage based on the first initialization voltage and a predetermined driving condition; and An electronic device driving method comprising the step of providing the first initialization voltage and the second initialization voltage to the display panel.
In Article 1, The step of determining the above initialization voltage is, An electronic device driving method comprising the step of determining the voltage level of the initialization voltage in the first luminance characteristic as the voltage level at a predetermined luminance that displays black.
In Article 1, A method for driving an electronic device having a margin voltage of 0.1V (volt) to 0.5V.
In Article 1, A method for driving an electronic device, wherein the step of determining the second initialization voltage includes the step of determining the value obtained by subtracting the driving condition from the first initialization voltage as the second initialization voltage.
In Article 1, The above driving conditions are a method for driving an electronic device having a voltage level of 1.5V to 2.0V.
In Article 1, An electronic device driving method in which the voltage level of the first initialization voltage is higher than the voltage level of the second initialization voltage.
In Article 6, An electronic device driving method in which, in the first luminance characteristic above, the first initialization voltage has a positive voltage level and the second initialization voltage has a negative voltage level.
In Article 1, In the above first luminance characteristic, the first initialization voltage has a first-1 voltage level, and An electronic device driving method further comprising the step of determining the first initialization voltage as a first-2 voltage level different from the first-1 voltage level based on the first-1 voltage level in the second luminance characteristic.
A display panel comprising a plurality of pixels and operating with a first luminance characteristic and a second luminance characteristic having a luminance lower than the first luminance characteristic at 255 grayscale levels, Each of the above plurality of pixels includes a light-emitting element and a pixel driving circuit connected to the light-emitting element, and The pixel driving circuit above is, A first transistor comprising a gate electrode connected to a first node, a first electrode electrically connected to a first power line to which a first driving voltage is provided, and a second electrode connected to a second node; A second transistor comprising a gate electrode connected to a first scan line to which a first scan signal is provided, a first electrode connected to a data line, and a second electrode connected to the first node; A first capacitor connected between the first node and the second node; A second capacitor connected between the first power line and the second node; A third transistor comprising a gate electrode connected to a second scan line that provides a second scan signal different from a first scan signal, a first electrode connected to a first voltage line that provides a first initialization voltage, and a second electrode connected to the first node; and A fourth transistor comprising a gate electrode connected to a third scan line that provides a third scan signal different from the second scan signal, a first electrode connected to the light-emitting element, and a second electrode connected to a second voltage line that provides a second initialization voltage, and The first initialization voltage is determined by compensating a predetermined margin voltage to the voltage level determined at the minimum brightness indicating black in the first brightness characteristic, and The above second initialization voltage is an electronic device determined based on the above first initialization voltage and predetermined driving conditions.
In Article 9, An electronic device having a margin voltage of 0.1V to 0.5V.
In Article 9, An electronic device in which the second initialization voltage is defined as the value obtained by subtracting the driving condition from the first initialization voltage.
In Article 9, The above driving conditions are an electronic device having a voltage level of 1.5V to 2.0V.
In Article 9, An electronic device in which the voltage level of the first initialization voltage is higher than the voltage level of the second initialization voltage.
In Article 9, An electronic device in which the first initialization voltage has a positive voltage level and the second initialization voltage has a negative voltage level.
In Article 9, In the above first luminance characteristic, the first initialization voltage has a first-1 voltage level, and An electronic device having a first-2 voltage level that is different from the first-1 voltage level in the second luminance characteristic above.
A first transistor comprising a gate electrode connected to a first node, a first electrode electrically connected to a first power line to which a first driving voltage is provided, and a second electrode connected to a second node; A second transistor comprising a gate electrode connected to a first scan line to which a first scan signal is provided, a first electrode connected to a data line, and a second electrode connected to the first node; A first capacitor connected between the first node and the second node; A second capacitor connected between the first power line and the second node; A third transistor comprising a gate electrode connected to a second scan line that provides a second scan signal different from a first scan signal, a first electrode connected to a first voltage line that provides a first initialization voltage, and a second electrode connected to the first node; and A fourth transistor comprising a gate electrode connected to a third scan line that provides a third scan signal different from the second scan signal, a first electrode electrically connected to a third node, and a second electrode connected to a second voltage line that provides a second initialization voltage, and The above first initialization voltage is determined by compensating a predetermined margin voltage to a voltage level determined at the minimum brightness displaying black, and The above second initialization voltage is a pixel driving circuit determined based on the above first initialization voltage and predetermined driving conditions.
In Article 16, A pixel driving circuit having a margin voltage of 0.1V to 0.5V.
In Article 16, A pixel driving circuit in which the second initialization voltage is defined as the value obtained by subtracting the driving condition from the first initialization voltage.
In Article 16, The above driving condition is a pixel driving circuit having a voltage level of 1.5V to 2.0V.
In Article 16, A pixel driving circuit in which the voltage level of the first initialization voltage is higher than the voltage level of the second initialization voltage.

Description

Pixel driving circuit, electronic device including the same, and electronic device driving method The present invention relates to a pixel driving circuit that prevents degradation of display quality, an electronic device including the same, and a method for driving an electronic device. Among display devices, organic light-emitting displays display images using organic light-emitting diodes (OLEDs) that generate light through the recombination of electrons and holes. These organic light-emitting displays have the advantage of fast response speeds and low power consumption. An organic light-emitting display device includes pixels connected to data lines and scan lines. Pixels generally include an organic light-emitting diode and a circuit for controlling the amount of current flowing to the organic light-emitting diode. The organic light-emitting diode generates light of a predetermined brightness in response to the amount of current delivered from the circuit. FIG. 1 is a block diagram illustrating an electronic device according to one embodiment of the present invention. FIG. 2 is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 3 is a rear perspective view of an electronic device according to one embodiment of the present invention. FIG. 4 is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 5 is a perspective view of an electronic device according to one embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a display panel according to one embodiment of the present invention. FIG. 7 is a cross-sectional view of a display layer according to one embodiment of the present invention. FIG. 8 is a block diagram of an electronic device according to one embodiment of the present invention. FIG. 9 is an equivalent circuit diagram of a pixel according to one embodiment of the present invention. FIG. 10 is a waveform diagram of signals for explaining the operation of a pixel according to one embodiment of the present invention. FIG. 11 is a flowchart illustrating a driving method of an electronic device according to one embodiment of the present invention. In this specification, where a component (or region, layer, part, etc.) is described as being “on,” “connected,” or “joined” another component, it means that it may be directly placed/connected/joined on the other component, or that a third component may be placed between them. Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the effective illustration of the technical content. “And/or” includes all one or more combinations that the associated components may define. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise. Additionally, terms such as “below,” “lower,” “above,” and “upper” are used to describe the relationships between the components depicted in the drawings. These terms are relative concepts and are described based on the directions indicated in the drawings. Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. The terms “part” and “unit” refer to software components or hardware components that perform a specific function. Hardware components may include, for example, field-programmable gate arrays (FPGAs) or application-specific integrated circuits (ASICs). Software components may refer to executable code and/or data used by executable code within an addressable storage medium. Thus, software components may be, for example, object-oriented software components, class components, and task components, and may include processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, or variables. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning