KR-20260064887-A - ELECTRONIC DEVICE AND DRIVING METHOD THEREOF

KR20260064887AKR 20260064887 AKR20260064887 AKR 20260064887AKR-20260064887-A

Abstract

An electronic device comprising a display panel, a driving controller that receives an input video signal and a control signal and outputs a voltage control signal, and a voltage generator that generates a bias voltage in response to the voltage control signal, wherein during a multi-frequency mode, a first display area of the display panel is driven at a first frequency and a second display area of the display panel is driven at a second frequency different from the first frequency, and the driving controller outputs the voltage control signal such that when the first display area is driven during the multi-frequency mode, the bias voltage has a basic bias voltage level and when the second display area is driven, the bias voltage has a compensation voltage level different from the basic bias voltage level.

Inventors

김지혜
권상안
윤창노
김남정
김지윤
김하늘
김홍수
이석훈

Assignees

삼성디스플레이 주식회사

Dates

Publication Date: 20260508
Application Date: 20241030

Claims (20)

A display panel including pixels; A driving controller that receives input video signals and control signals and outputs voltage control signals; and It includes a voltage generator that generates a bias voltage in response to the above voltage control signal, The above pixel is, A first transistor comprising a first electrode, a second electrode and a gate electrode; and A ninth transistor comprising a first electrode connected to the first electrode of the first transistor, a second electrode connected to a bias voltage line receiving the bias voltage, and a gate electrode, and During multi-frequency mode, a first display area of the display panel is driven at a first frequency, and a second display area of the display panel is driven at a second frequency different from the first frequency, and The above driving controller is an electronic device that outputs a voltage control signal such that when the first display area is driven during the multi-frequency mode, the bias voltage has a basic bias voltage level, and when the second display area is driven, the bias voltage has a compensation voltage level different from the basic bias voltage level.
In Article 1, The second frequency is lower than the first frequency, and The above compensation voltage level is higher than the above basic bias voltage level in an electronic device.
In Article 2, An electronic device in which, during the above multi-frequency mode, the second display area of the display panel is divided into a boundary area adjacent to the first display area and a non-boundary area adjacent to the boundary area.
In Paragraph 3, An electronic device in which, when the boundary region of the second display region is driven during the multi-frequency mode, the bias voltage is gradually lowered from the compensation voltage level to the basic bias voltage level.
In Article 2, An electronic device in which the compensation voltage level of the bias voltage is determined based on a stress index according to the ratio of the first frequency and the second frequency when the second display area is driven during the multi-frequency mode.
In Article 5, An electronic device having a first compensation voltage level when the stress index is a first value, and a second compensation voltage level higher than the first compensation voltage level when the stress index is a second value greater than the first value.
In Article 2, During the above multi-frequency mode, the first display area includes a first boundary area adjacent to the second display area and a first non-boundary area adjacent to the first boundary area, and An electronic device in which the bias voltage is gradually lowered from the basic bias voltage level when the first boundary region is driven.
In Article 1, The above pixel is, A light-emitting element comprising an anode and a cathode; and The eighth transistor further comprises a first electrode connected to the anode of the light-emitting element, a second electrode connected to an initialization voltage line receiving an initialization voltage, and a gate electrode. The above voltage generator is an electronic device that further generates the initialization voltage in response to the above voltage control signal.
In Article 8, The above driving controller is an electronic device that outputs a voltage control signal such that when the first display area is driven during the multi-frequency mode, the initialization voltage has a basic initialization voltage level, and when the second display area is driven, the initialization voltage has a compensation initialization voltage level lower than the basic initialization voltage level.
In Article 9, An electronic device in which, during the multi-frequency mode, when a boundary region adjacent to the first display region among the second display regions is driven, the initialization voltage is gradually increased from the compensation initialization voltage level to the basic initialization voltage level.
In Article 10, An electronic device in which the compensation initialization voltage level of the initialization voltage is determined based on a stress index according to the ratio of the first frequency and the second frequency when the second display area is driven during the multi-frequency mode.
In Article 11, An electronic device having a first compensation initial voltage level when the stress index is a first value, and a second compensation initial voltage level when the stress index is a second value greater than the first value, wherein the compensation initial voltage level has a second compensation initial voltage level higher than the first compensation initial voltage level.
In Article 1, The processor further includes the input image signal, the control signal, and the mode signal. The above-described drive controller is an electronic device that determines an operating mode based on the above-described mode signal.
A driving method for an electronic device comprising a display panel including a pixel comprising a first transistor and a ninth transistor connected between a first electrode of the first transistor and a bias voltage line receiving a bias voltage: A step of determining the first frequency of the first display area, the second frequency of the second display area, and the start position of the second display area of the display panel during a multi-frequency mode; A step of determining whether the operation mode is a boundary region compensation mode; and The above operating mode includes a step of controlling the voltage level of the bias voltage when the above operating mode is the boundary region compensation mode, The step of controlling the voltage level of the above bias voltage is, When the first display area is driven during the above multi-frequency mode, the bias voltage is controlled to have a basic bias voltage level, and A driving method for an electronic device that controls the bias voltage to have a compensation voltage level different from the basic bias voltage level when the boundary region adjacent to the first display region among the second display regions is driven.
In Article 14, The second frequency is lower than the first frequency, and A driving method for an electronic device in which the above compensation voltage level is higher than the above basic bias voltage level.
In Article 15, A driving method for an electronic device in which, when the boundary region of the second display region is driven during the multi-frequency mode, the bias voltage is gradually lowered from the compensation voltage level to the basic bias voltage level.
In Article 15, A driving method for an electronic device in which the compensation voltage level of the bias voltage is determined based on a stress index according to the ratio of the first frequency and the second frequency when the second display area is driven during the multi-frequency mode.
In Article 17, A driving method for an electronic device having a first compensation voltage level when the stress index is a first value, and a second compensation voltage level higher than the first compensation voltage level when the stress index is a second value greater than the first value.
In Article 15, During the above multi-frequency mode, the first display area includes a first boundary area adjacent to the second display area and a first non-boundary area adjacent to the first boundary area, and A driving method for an electronic device in which the bias voltage is gradually lowered from the basic bias voltage level when the above-mentioned first boundary region is driven.
In Article 15, The above pixel is, A light-emitting element comprising an anode and a cathode; and The eighth transistor further comprises a first electrode connected to the anode of the light-emitting element, a second electrode connected to an initialization voltage line receiving an initialization voltage, and a gate electrode. A driving method for an electronic device further comprising the step of controlling the initialization voltage to have a basic initialization voltage level when the first display area is driven during the multi-frequency mode, and the initialization voltage to have a compensation initialization voltage level lower than the basic initialization voltage level when the second display area is driven.

Description

Electronic device and driving method thereof The present invention relates to an electronic device. Electronic devices such as smartphones, digital cameras, laptop computers, navigation systems, monitors, and smart televisions can display images. The electronic device includes a plurality of pixels for displaying an image and driving circuits for controlling the plurality of pixels. Each of the plurality of pixels includes a light-emitting element and a pixel circuit for controlling the light-emitting element. The pixel circuit may include a plurality of organically connected transistors. Recently, as the fields of application for electronic devices have become more diverse, multiple different images can be displayed on a single electronic device. FIG. 1 is a plan view of a display device according to one embodiment of the present invention. FIGS. 2a and FIGS. 2b are perspective views of a display device according to one embodiment of the present invention. FIG. 3a is a diagram illustrating the operation of a display device in single frequency mode. FIG. 3b is a diagram illustrating the operation of a display device in multi-frequency mode. FIG. 4 is a block diagram of a display device according to one embodiment of the present invention. FIG. 5 is a circuit diagram of a pixel according to one embodiment of the present invention. Figure 6 exemplarily shows scan signals in single frequency mode and multi-frequency mode. Figure 7 exemplarily shows scan signals in single frequency mode and multi-frequency mode. FIG. 8a is a timing diagram for explaining the operation of a pixel in the second frame of a multi-frequency mode. FIG. 8b is a timing diagram to explain the operation of a pixel in the second frame of a multi-frequency mode. Figure 10 exemplarily shows an image displayed on a display panel in single frequency mode and multi-frequency mode. FIG. 11 is a flowchart showing the operation of a drive controller in an electronic device according to one embodiment of the present invention. Figure 12 is a diagram showing an exemplary voltage level of the bias voltage during the boundary region compensation mode. FIG. 13 is a diagram showing exemplary voltage levels of the bias voltage during the first, second, and third compensation modes. FIG. 14 is a diagram showing exemplary voltage levels of bias voltage according to the operating mode. FIG. 15 is a diagram showing exemplary voltage levels of bias voltage according to the operating mode. FIG. 16 is a flowchart showing the operation of a drive controller in an electronic device according to one embodiment of the present invention. FIG. 17 is a diagram showing exemplary voltage levels of bias voltage according to the operating mode. FIG. 18 is a diagram exemplarily showing a second initialization voltage according to the operation mode. FIG. 19 is a diagram exemplarily showing a second initialization voltage according to the operation mode. Figure 21 is a diagram exemplifying the bias voltage according to the operating mode. FIG. 22 is a block diagram illustrating an exemplary configuration of an electronic device. In this specification, where a component (or region, layer, part, etc.) is described as being "on," "connected," or "combined" with another component, it means that it may be directly placed/connected/combined with 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 the 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 side," "above," and "upper side" 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. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as general