KR-102964515-B1 - Display Device and Driving Method of the same

Abstract

The present embodiment may provide a display device comprising: a display panel including a subpixel; and a data driver that supplies a data voltage to the subpixel, wherein the subpixel includes a compensation circuit that compensates for a driving current generated from a driving transistor based on a compensation voltage input from the outside.

Inventors

• 하창덕
• 김재영

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260513

Application Date

20230127

Claims (15)

1. A display panel including subpixels; and It includes a data driver that supplies data voltage to the above subpixel, and The above subpixel is It includes a compensation circuit that compensates the driving current generated from the driving transistor based on a compensation voltage input from an external source, and The above compensation circuit is A compensation transistor that transmits the above compensation voltage, and It includes a compensation capacitor that stores the compensation voltage output through the compensation transistor, and The first electrode of the above compensation capacitor is connected to the anode electrode of the light-emitting diode included in the above subpixel, and The above compensation transistor is a display device in which the first electrode is connected to the second electrode of the compensation capacitor, the second electrode is connected to a compensation voltage line that transmits the compensation voltage, and the gate electrode is connected to a scan line.
2. In paragraph 1, The above compensation voltage is A display device selected to a level capable of varying the gate-source voltage of the above-mentioned driving transistor.
3. In paragraph 1, The above compensation voltage is A display device having a range from negative voltage to positive voltage.
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5. In paragraph 1, The above compensation capacitor is A display device positioned adjacent to the anode electrode of the light-emitting diode.
6. In paragraph 1, The above compensation capacitor is A display device comprising a lower electrode that overlaps with the anode electrode of the light-emitting diode.
7. In paragraph 6, The above compensation capacitor is A display device comprising an anode electrode of the light-emitting diode, a lower electrode, and an insulating material layer located between the anode electrode and the lower electrode.
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9. In paragraph 1, The above compensation voltage line is A display device shared with a data line connected to the above subpixel.
10. In Paragraph 9, The above data driving unit A display device that outputs the data voltage during a first time period through the above data line and outputs the compensation voltage during a second time period after the first time period.
11. In paragraph 1, The above compensation voltage is A display device applied after the threshold voltage compensation of the above driving transistor is completed.
12. In paragraph 1, The above compensation voltage is A display device applied at least one different level for each data line of the display panel or for each data line block of the display panel.
13. In a driving method of a display device according to claim 1, A step of compensating the threshold voltage of the driving transistor included in the plurality of subpixels; A step of applying the compensation voltage to the plurality of subpixels to compensate for the driving current deviation between the plurality of subpixels; and A driving method for a display device comprising the step of emitting a plurality of subpixels.
14. In Paragraph 13, The above compensation voltage is A driving method for a display device having a range from a negative voltage to a positive voltage that can vary the gate-source voltage of the driving transistor.
15. In Paragraph 13, The above compensation voltage is A driving method for a display device applied to each of the plurality of subpixels by the operation of a compensation circuit comprising a compensation transistor that transmits the compensation voltage and is included in each of the plurality of subpixels, and a compensation capacitor that stores the compensation voltage output through the compensation transistor.

Description

Display Device and Driving Method of the same This specification relates to a display device and a method for driving the same. As information technology advances, the market for display devices, which serve as a medium connecting users and information, is growing. Consequently, the use of display devices such as Light Emitting Display Devices (LEDs), Quantum Dot Display Devices (QDDs), and Liquid Crystal Display Devices (LCDs) is increasing. The display devices described above include a display panel containing subpixels, a driving unit that outputs a driving signal for driving the display panel, and a power supply unit that generates power to be supplied to the display panel or the driving unit. When driving signals, such as scan signals and data signals, are supplied to subpixels formed on a display panel, the selected subpixel transmits light or emits light directly, thereby displaying an image. FIG. 1 is a block diagram schematically illustrating a display device according to an embodiment of the present specification. FIG. 2 is a cross-sectional view showing the stacked form of a display panel according to an embodiment of the present specification. FIG. 3 is a diagram showing a compensation circuit included in a subpixel according to the first embodiment of the present specification. FIG. 4 is a diagram for explaining the operation of a compensation circuit according to the first embodiment of the present specification. FIG. 5 is a drawing for explaining a data driving unit for driving a compensation circuit according to the first embodiment of the present specification. FIG. 6 is a drawing showing a subpixel including a compensation circuit according to a second embodiment of the present specification. FIG. 7 is a waveform diagram for explaining the operation of a subpixel including a compensation circuit according to a second embodiment of the present specification. FIGS. 8 and 9 are waveform diagrams to show changes in voltage and current according to the driving waveform shown in FIG. 7. FIG. 10 is a drawing showing the difference before and after compensation driving according to the second embodiment of the present specification. FIGS. 11 to 13 are drawings showing a subpixel and a data driver including a compensation circuit according to a third embodiment of the present specification. FIGS. 14 and FIGS. 15 are drawings for explaining a voltage transfer method according to a third embodiment of the present specification. FIGS. 16 and FIGS. 17 are drawings for explaining a method of applying a compensation voltage according to the fourth embodiment of the present specification. FIG. 18 is a drawing illustrating an example of the arrangement of a gate driver for supplying a third scan signal added to apply a compensation voltage according to the fifth embodiment of the present specification. FIG. 19 is a simplified plan view showing the planar structure of a subpixel including a compensation circuit according to the 6th embodiment of the present specification. FIG. 20 is a cross-sectional view showing the region where the organic light-emitting diode, driving transistor, compensation capacitor, and compensation transistor are located in FIG. 19. The display device according to the present specification may be implemented as a light-emitting display device (LED) or a quantum dot display device (QDD), etc. However, for convenience of explanation, a light-emitting display device that directly emits light based on an inorganic light-emitting diode or an organic light-emitting diode is used as an example below. In addition, the thin-film transistor described below may be implemented as an n-type thin-film transistor, a p-type thin-film transistor, or in a form where both n-type and p-type exist together. A thin-film transistor is a three-electrode device comprising a gate, a source, and a drain. The source is the electrode that supplies carriers to the transistor. Within the thin-film transistor, carriers begin to flow from the source. The drain is the electrode from which carriers exit the thin-film transistor. In other words, the flow of carriers in the thin-film transistor flows from the source to the drain. In the case of a p-type thin-film transistor, since the carrier is a hole, the source voltage is higher than the drain voltage to allow holes to flow from the source to the drain. Because holes flow from the source to the drain in a p-type thin-film transistor, current flows from the source to the drain. In contrast, in the case of an n-type thin-film transistor, since the carrier is an electron, the source voltage is lower than the drain voltage to allow electrons to flow from the source to the drain. Because electrons flow from the source to the drain in an n-type thin-film transistor, the direction of the current flows from the drain to the source. However, the source and drain of a thin-film transistor can change depending on the applied voltage. Reflecting this, in the following descripti