CN-121999714-A - Pixel, display device comprising pixel and electronic device comprising display device

Abstract

Pixels, display devices including pixels, and electronic devices including display devices are disclosed. The pixel includes a first transistor including a first terminal, a gate electrode connected to a first node, and a second terminal connected to a second node, a third transistor connecting a sensing line to the second node, a fourth transistor connecting a power supply line to the first terminal of the first transistor, a first capacitor, and a light emitting element. The frame period includes an active period and a blanking period. The blanking period includes a sensing compensation period in which a threshold voltage of the first transistor is stored in the first capacitor, a sensing address period in which a sensing data voltage is applied to the first node, and a sensing period in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line.

Inventors

• ZHENG JUNQI
• Huang Dinghuan
• Xu Rongwan

Assignees

• 三星显示有限公司

Dates

Publication Date

20260508

Application Date

20251030

Priority Date

20241101

Claims (13)

1. 1. A pixel, comprising: a first transistor including a first terminal, a gate connected to the first node, and a second terminal connected to the second node; a second transistor connecting a data line to the first node in response to a write gate signal; a third transistor connecting a sensing line to the second node in response to an initialization gate signal; a fourth transistor connecting a power supply line to the first terminal of the first transistor in response to a transmission signal, wherein the power supply line transmits a first power supply voltage; a first capacitor connected between the first node and the second node, and A light emitting element including a first terminal connected to the second node and a second terminal receiving a second power supply voltage, Wherein: The frame period includes an active period and a blanking period following the active period, and The blanking period includes: A sensing compensation period in which a threshold voltage of the first transistor is stored in the first capacitor; A sense address period in which a sense data voltage is applied to the first node, wherein the sense address period is after the sense compensation period, and A sensing period in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line, wherein the sensing period is after the sensing address period.
2. 2. The pixel of claim 1, wherein the blanking period further comprises: a sensing initialization period in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node, wherein the sensing initialization period precedes the sensing compensation period.
3. 3. The pixel of claim 1, wherein the blanking period further comprises: a first sensing bypass period in which an initialization voltage is applied to the second node, wherein the first sensing bypass period precedes the sensing period.
4. 4. A pixel according to claim 3, wherein the blanking period further comprises: A second sensing bypass period in which the initialization voltage is applied to the second node, wherein the second sensing bypass period is subsequent to the sensing period.
5. 5. The pixel of claim 1, further comprising: A second capacitor including a first terminal connected to the second node and a second terminal receiving a constant voltage.
6. 6. The pixel according to claim 5, wherein, The constant voltage is one of an initialization voltage and the first power supply voltage.
7. 7. The pixel of claim 1, wherein, The second power supply voltage is a constant voltage having a voltage level lower than that of the first power supply voltage.
8. 8. The pixel of claim 1, wherein, The second power supply voltage has a low voltage level in the active period and a high voltage level higher than the low voltage level in the blanking period.
9. 9. The pixel of claim 1, wherein the activation period comprises: An initialization period in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node; A compensation period in which the threshold voltage of the first transistor is stored in the first capacitor, wherein the compensation period follows the initialization period; an address period in which a data voltage is applied to the first node, wherein the address period is after the compensation period; a bypass period in which the initialization voltage is applied to the second node, wherein the bypass period is after the address period, and An emission period in which a driving current corresponding to the data voltage flows through the light emitting element, wherein the emission period is after the bypass period.
10. 10. A display device, comprising: A display panel comprising the pixel according to any one of claims 1 to 9; a gate driver supplying the write gate signal and the initialization gate signal to each of the pixels; an emission driver supplying the emission signal to each of the pixels; a data driver connected to each of the pixels via the data lines, and And a sensing circuit connected to each of the pixels through the sensing line.
11. 11. The display device of claim 10, wherein, The display panel includes a plurality of vertical blocks each including a plurality of pixel rows, and The gate driver supplies write gate signals respectively corresponding to the vertical blocks in the sense address period.
12. 12. The display device of claim 10, wherein the data driver: Supplying the sensing data voltage corresponding to the white gray scale to each of the pixel columns overlapping the sensing region, and The sensing data voltage corresponding to black gray is supplied to each of the pixel columns that do not overlap the sensing region.
13. 13. An electronic device, comprising: A processor; a memory connected to the processor; A power module connected to the processor, and A display device that receives input image data from the processor and displays an image corresponding to the input image data, the display device comprising: A display panel comprising the pixel according to any one of claims 1 to 9; a gate driver supplying the write gate signal and the initialization gate signal to each of the pixels; an emission driver supplying the emission signal to each of the pixels; a data driver connected to each of the pixels via the data lines, and And a sensing circuit connected to each of the pixels through the sensing line.

Description

Pixel, display device comprising pixel and electronic device comprising display device Technical Field Embodiments relate to a display device. More particularly, embodiments relate to a pixel that emits light, a display device including the pixel, and an electronic device including the display device. Background The display device may include pixels that emit light. Each of the pixels may include a driving transistor generating a driving current and a light emitting element emitting light having a luminance corresponding to the driving current. As the usage time of the display device increases, the driving transistor and the light emitting element may be degraded. Accordingly, the degree of degradation of the driving transistor and/or the degree of degradation of the light emitting element may be measured by sensing the current flowing through the pixel. Disclosure of Invention Embodiments provide a pixel in which a temperature-based (e.g., temperature-based only) sensing current flows. The embodiment provides a display device in which a temperature of a display panel is accurately estimated, and an electronic device including the display device. A pixel according to an embodiment includes a first transistor including a first terminal, a gate connected to a first node, and a second terminal connected to a second node, a second transistor connecting a data line to the first node in response to a write gate signal, a third transistor connecting a sensing line to the second node in response to an initialization gate signal, a fourth transistor connecting a power line to the first terminal of the first transistor in response to an emission signal, wherein the power line transmits a first power voltage, a first capacitor connected between the first node and the second node, and a light emitting element including a first terminal connected to the second node and a second terminal receiving the second power voltage. The frame period includes an active period and a blanking period following the active period. The blanking period includes a sensing compensation period in which a threshold voltage of the first transistor is stored in the first capacitor, a sensing address period in which a sensing data voltage is applied to the first node, wherein the sensing address period follows the sensing compensation period, and a sensing period in which a sensing current corresponding to the sensing data voltage flows from the power line to the sensing line, wherein the sensing period follows the sensing address period. In an embodiment, the blanking period may further include a sensing initialization period in which the reference voltage is applied to the first node and the initialization voltage is applied to the second node, wherein the sensing initialization period precedes the sensing compensation period. In an embodiment, the blanking period may further include a first sensing bypass period in which an initialization voltage is applied to the second node, wherein the first sensing bypass period precedes the sensing period. In an embodiment, the blanking period may further include a second sensing bypass period in which an initialization voltage is applied to the second node, wherein the second sensing bypass period is subsequent to the sensing period. In an embodiment, the pixel may further include a second capacitor including a first terminal connected to the second node and a second terminal receiving a constant voltage. In an embodiment, the constant voltage may be one of an initialization voltage and a first power supply voltage. In an embodiment, the second power supply voltage may be a constant voltage having a voltage level lower than that of the first power supply voltage. In an embodiment, the second power supply voltage may have a low voltage level in the active period and may have a high voltage level higher than the low voltage level in the blanking period. In an embodiment, the activation period may include an initialization period in which a reference voltage is applied to the first node and an initialization voltage is applied to the second node, a compensation period in which a threshold voltage of the first transistor is stored in the first capacitor, wherein the compensation period is after the initialization period, an address period in which a data voltage is applied to the first node, wherein the address period is after the compensation period, a bypass period in which the initialization voltage is applied to the second node, wherein the bypass period is after the address period, and an emission period in which a driving current corresponding to the data voltage flows through the light emitting element, wherein the emission period is after the bypass period. A display device according to an embodiment includes a display panel including pixels, a gate driver supplying a write gate signal and an initialization gate signal to each of the pixels, an emission driver supplying an emission signal to each of