KR-20260065724-A - PIXEL, DISPLAY DEVICE INCLUDING THE PIXEL, AND ELECTRONIC DEVICE INCLUDING THE DISPLAY DEVICE

Abstract

A pixel includes a first transistor comprising a gate connected to a first node, a first terminal, and a second terminal connected to a second node; a second transistor connecting a data line and the first node in response to a write gate signal; a third transistor connecting a sensing line and the second node in response to an initialization gate signal; a fourth transistor connecting a power line transmitting a first power supply voltage in response to a light emission signal and the first terminal of the first transistor; a first capacitor connected between the first node and the second node; and a light-emitting element comprising a first terminal connected to the second node and a second terminal receiving a second power supply voltage. A frame interval includes an active interval and a blank interval following the active interval. The blank interval includes a sensing compensation interval in which the threshold voltage of the first transistor is stored in the first capacitor; a sensing addressing interval in which a sensing data voltage is applied to the first node after the sensing compensation interval; and a sensing interval in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line after the sensing addressing interval.

Inventors

• 정준기
• 황정환
• 서영완

Assignees

• 삼성디스플레이 주식회사

Dates

Publication Date

20260511

Application Date

20250519

Priority Date

20241101

Claims (20)

1. A first transistor comprising a gate connected to a first node, a first terminal, and a second terminal connected to a second node; A second transistor connecting the data line and the first node in response to a write gate signal; A third transistor connecting the sensing line and the second node in response to an initialization gate signal; A fourth transistor connecting a power line that transmits a first power supply voltage in response to a light emission signal and the first terminal of the first transistor; A first capacitor connected between the first node and the second node; and A light-emitting element comprising a first terminal connected to the second node and a second terminal receiving a second power supply voltage, and The frame section includes an active section and a blank section following the active section, and The above blank section is, A sensing compensation section in which the threshold voltage of the first transistor is stored in the first capacitor; A sensing addressing period in which a sensing data voltage is applied to the first node after the sensing compensation period; and A pixel including a sensing section in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line after the sensing addressing section.
2. In Article 1, The above blank section is, A pixel further comprising a sensing initialization section in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node prior to the sensing compensation section.
3. In Article 1, The above blank section is, A pixel further comprising a first sensing bypass section in which an initialization voltage is applied to the second node prior to the above sensing section.
4. In Paragraph 3, The above blank section is, A pixel further comprising a second sensing bypass section in which the initialization voltage is applied to the second node after the above sensing section.
5. In Article 1, A pixel further comprising a second capacitor including a first terminal connected to the second node and a second terminal receiving a constant voltage.
6. In Article 5, The above constant voltage is one of the initialization voltage and the first power supply voltage, a pixel.
7. In Article 1, The pixel, wherein the second power supply voltage is a constant voltage having a voltage level lower than the voltage level of the first power supply voltage.
8. In Article 1, The pixel, wherein the second power supply voltage has a low voltage level in the active section and a high voltage level higher than the low voltage level in the blank section.
9. In Article 1, The above active section is, An initialization period in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node; Compensation period in which the threshold voltage of the first transistor is stored in the first capacitor after the initialization period; An addressing period in which a data voltage is applied to the first node after the above compensation period; A bypass section in which the initialization voltage is applied to the second node after the above addressing section; and A pixel comprising a light-emitting section in which a driving current corresponding to the data voltage flows through the light-emitting element after the bypass section.
10. A display panel including pixels; A gate driver that provides a write gate signal and an initialization gate signal to each of the above pixels; A light-emitting driver that provides a light-emitting signal to each of the above pixels; A data driver connected to each of the above pixels via a data line; and It includes a sensing circuit connected to each of the above pixels through a sensing line, and Each of the above pixels is, A first transistor comprising a gate connected to a first node, a first terminal, and a second terminal connected to a second node; A second transistor connecting the data line and the first node in response to the above write gate signal; A third transistor connecting the sensing line and the second node in response to the initialization gate signal; A fourth transistor connecting a power line that transmits a first power supply voltage in response to the above light emission signal and the first terminal of the first transistor; A first capacitor connected between the first node and the second node; and A light-emitting element comprising a first terminal connected to the second node and a second terminal receiving a second power supply voltage, and The frame section includes an active section and a blank section following the active section, and The above blank section is, A sensing compensation section in which the threshold voltage of the first transistor is stored in the first capacitor; A sensing addressing period in which a sensing data voltage is applied to the first node after the sensing compensation period; and A display device comprising a sensing section in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line after the sensing addressing section.
11. In Article 10, The above display panel includes a plurality of vertical blocks, each comprising a plurality of pixel rows, and A display device in which the gate driver provides write gate signals corresponding to each of the vertical blocks in the sensing addressing interval.
12. In Article 10, A display device wherein the data driver provides the sensing data voltage corresponding to a white gradation to each of the pixel columns where the sensing area is located in the sensing addressing interval, and provides the sensing data voltage corresponding to a black gradation to each of the pixel columns where the sensing area is not located.
13. In Article 10, The above blank section is, A display device further comprising a sensing initialization section in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node prior to the sensing compensation section.
14. In Article 10, The above blank section is, A display device further comprising a first sensing bypass section in which an initialization voltage is applied to the second node prior to the above sensing section.
15. In Article 14, The above blank section is, A display device further comprising a second sensing bypass section in which the initialization voltage is applied to the second node after the above sensing section.
16. In Article 10, Each of the above pixels is, A display device further comprising a second capacitor including a first terminal connected to the second node and a second terminal receiving a constant voltage.
17. In Article 10, A display device in which the second power supply voltage is a constant voltage having a voltage level lower than the voltage level of the first power supply voltage.
18. In Article 10, A display device in which the second power supply voltage has a low voltage level in the active section and a high voltage level higher than the low voltage level in the blank section.
19. In Article 10, The above active section is, An initialization period in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node; Compensation period in which the threshold voltage of the first transistor is stored in the first capacitor after the initialization period; An addressing period in which a data voltage is applied to the first node after the above compensation period; A bypass section in which the initialization voltage is applied to the second node after the above addressing section; and A display device comprising a light-emitting section in which a driving current corresponding to the data voltage flows through the light-emitting element after the bypass section.
20. processor; Memory connected to the above processor; A power module connected to the above processor; and It includes a display device that receives input image data from the above processor and displays an image corresponding to the input image data. The above display device is, A display panel including pixels; A gate driver that provides a write gate signal and an initialization gate signal to each of the above pixels; A light-emitting driver that provides a light-emitting signal to each of the above pixels; A data driver connected to each of the above pixels via a data line; and It includes a sensing circuit connected to each of the above pixels through a sensing line, and Each of the above pixels is, A first transistor comprising a gate connected to a first node, a first terminal, and a second terminal connected to a second node; A second transistor connecting the data line and the first node in response to the above write gate signal; A third transistor connecting the sensing line and the second node in response to the initialization gate signal; A fourth transistor connecting a power line that transmits a first power supply voltage in response to the above light emission signal and the first terminal of the first transistor; A first capacitor connected between the first node and the second node; and A light-emitting element comprising a first terminal connected to the second node and a second terminal receiving a second power supply voltage, and The frame section includes an active section and a blank section following the active section, and The above blank section is, A sensing compensation section in which the threshold voltage of the first transistor is stored in the first capacitor; A sensing addressing period in which a sensing data voltage is applied to the first node after the sensing compensation period; and An electronic device comprising a sensing section in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line after the sensing addressing section.

Description

Pixel, display device including the pixel, and electronic device including the display device The present invention relates to a display device. More specifically, the present invention relates to a light-emitting pixel, a display device including such pixel, and an electronic device including such display device. The display device may include light-emitting pixels. Each pixel may include a driving transistor that generates a driving current and a light-emitting element that emits light with a brightness corresponding to the driving current. As the usage time of the display device increases, the driving transistor and the light-emitting element may degrade. Accordingly, the degree of degradation of the driving transistor and/or the degree of degradation of the light-emitting element can be measured by sensing the current flowing through the pixel. FIG. 1 is a block diagram showing a display device according to one embodiment. Figure 2 is a circuit diagram showing an example of a pixel of Figure 1. Figure 3 is a timing diagram showing the voltages and signals provided to the pixels of Figure 1 during the active period. Figure 4 is a timing diagram showing voltages and signals provided to the pixels of Figure 1 in a blank section. Figure 5 is a drawing showing the display panel of Figure 1. Figure 6 is a diagram illustrating the sensing initialization section of Figure 4. Figure 7 is a diagram illustrating the sensing compensation section of Figure 4. Figure 8 is a diagram illustrating the sensing addressing section of Figure 4. Figure 9 is a drawing showing an example of a sensing area of the display panel of Figure 5. Figure 10 is a drawing showing an example of a sensing area of the display panel of Figure 5. Figure 11 is a drawing showing an example of a sensing area of the display panel of Figure 5. FIG. 12 is a diagram for explaining the first sensing bypass section of FIG. 4. Figure 13 is a diagram illustrating the sensing section of Figure 4. Figure 14 is a graph to explain the sensing current of Figure 13. FIG. 15 is a diagram illustrating the second sensing bypass section of FIG. 4. Figure 16 is a timing diagram showing voltages and signals provided to the pixels of Figure 1 in a blank section. FIG. 17 is a block diagram showing an electronic device according to one embodiment. FIG. 18 is a drawing showing electronic devices according to embodiments. Hereinafter, a pixel, a display device, and an electronic device according to embodiments of the present invention may be described in more detail with reference to the attached drawings. Identical or similar reference numerals may be used for identical components in the attached drawings. FIG. 1 is a block diagram showing a display device (100) according to one embodiment. Referring to FIG. 1, the display device (100) may include a display panel (110), a gate driver (120), a light-emitting driver (130), a data driver (140), a sensing circuit (150), and a controller (160). The display panel (110) may include pixels (PX), gate lines, light-emitting lines, data lines (DL), and sensing lines (SL). The pixels (PX) may be connected to the gate lines, light-emitting lines, data lines (DL), and sensing lines (SL). The display panel (110) may include a display area for displaying an image and a non-display area surrounding at least a portion of the display area. Pixels (PX) may be located within the display area. A gate driver (120) can be connected to pixels (PX) through gate lines. The gate driver (120) can provide a write gate signal (GW) and an initialization gate signal (GI) to each of the pixels (PX). The gate driver (120) can generate the write gate signal (GW) and the initialization gate signal (GI) based on a first control signal (CNT1). The first control signal (CNT1) may include a gate clock signal, a gate start signal, etc. In one embodiment, the gate driver (120) may be formed or mounted in a non-display area of a display panel (110). The light-emitting driver (130) can be connected to pixels (PX) through light-emitting lines. The light-emitting driver (130) can provide a light-emitting signal (EM) to each of the pixels (PX). The light-emitting driver (130) can generate a light-emitting signal (EM) based on a second control signal (CNT2). The second control signal (CNT2) may include a light-emitting clock signal, a light-emitting start signal, etc. In one embodiment, the light-emitting driver (130) may be formed or mounted in a non-display area of the display panel (110). The data driver (140) can be connected to pixels (PX) via data lines (DL). The data driver (140) can provide a data signal (DS) to each of the pixels (PX). The data driver (140) can generate the data signal (DS) based on output image data (IMD2) and a third control signal (CNT3). The data driver (140) can convert the output image data (IMD2) in a digital format into a data signal (DS) in an analog format. The third control signal (CNT3) may include a data clock signal, a load sig