Display device

Patent metadata

Field	Value
Publication number	US-12154489-B2
Application number	US-202318234477-A
Country	US
Kind code	B2
Filing date	Aug 16, 2023
Priority date	Dec 10, 2021
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

A display device includes a display panel, a data driver, a scan driver, and a light emitting driver. The display panel includes a first display area and a second display area. The display panel displays a first image on the first display area and the second display area in a first mode, and displays a second image on the first display area in a second mode. The light emitting driver activates emission control signals applied to the first display area and the second display area in the first mode. The light emitting driver activates emission control signals applied to the second display area during a first partial frame in the second mode, and maintains the emission control signals applied to the second display area in a deactivation state during a plurality of second partial frames in the second mode.

First claim

What is claimed is:

1. A display device comprising:
a display panel including a first display area and a second display area;
a data driver which outputs a plurality of data signals to the display panel;
a scan driver which outputs a plurality of scan signals to the display panel; and
a light emitting driver which outputs a plurality of emission control signals to the display panel,
wherein the display panel displays a first image on the first display area and the second display area in a first mode, and displays a second image on the first display area in a second mode, and
wherein the light emitting driver
activates the plurality of emission control signals applied to the first display area and the second display area in the first mode,
maintains emission control signals applied to the second display area among the plurality of emission control signals in a deactivation state during at least one partial frame in the second mode.

2. The display device of claim 1 , wherein the light emitting driver
activates the emission control signals applied to the second display area during a first partial frame in the second mode, and
maintains the emission control signals applied to the second display area in the deactivation state during a plurality of second partial frame in the second mode,
wherein the data driver
supplies a bias data signal to the second display area during the first partial frame, and
supplies a non-fixed data signal different from the bias data signal to the second display area during at least one partial frame among the plurality of second partial frames.

3. The display device of claim 2 , wherein the bias data signal is a black data signal having a black grayscale.

4. The display device of claim 2 , wherein the non-fixed data signal is a data signal corresponding to a specific image.

5. The display device of claim 2 , wherein the plurality of second partial frames include:
a plurality of first intermediate partial frames in which a data signal corresponding to a specific image is supplied; and
a second intermediate partial frame, which is adjacent to one of the plurality of first intermediate partial frames and in which a grayscale data signal having a specific grayscale is supplied.

6. The display device of claim 5 , wherein the second intermediate partial frame includes:
a first grayscale partial frame in which a first grayscale data signal having a first grayscale is supplied; and
a second grayscale partial frame in which a second grayscale data signal having a second grayscale different from the first grayscale is supplied.

7. The display device of claim 2 , wherein the plurality of second partial frames include:
a plurality of first grayscale partial frames in which a first grayscale data signal having a first grayscale is supplied; and
a plurality of second grayscale partial frames in which a second grayscale data signal having a second grayscale different from the first grayscale is supplied.

8. The display device of claim 7 , wherein the plurality of first grayscale partial frames and the plurality of second grayscale partial frames are arranged alternately with each other.

9. The display device of claim 7 , wherein the plurality of second partial frames further include:
an intermediate partial frame in which no data signal is supplied from the data driver to the second display area.

10. The display device of claim 9 , wherein the scan driver
activates scan signals applied to the second display area among the plurality of scan signals during the plurality of first grayscale partial frames and the plurality of second grayscale partial frames, and
deactivates the scan signals applied to the second display area among the plurality of scan signals during the intermediate partial frame.

11. The display device of claim 2 , wherein the non-fixed data signal is a data signal identical to an image data signal applied to the first display area.

12. The display device of claim 2 , wherein the first partial frame includes:
a start partial frame which is an initial partial frame in the second mode; and
a last partial frame which is a last partial frame in the second mode.

13. The display device of claim 2 , wherein the first partial frame is a start partial frame which is an initial partial frame in the second mode.

14. The display device of claim 2 , wherein the light emitting driver includes:
a plurality of stages which outputs the plurality of emission control signals, respectively; and
a carry circuit connected to a (k−1)-th stage among the plurality of stages, wherein the carry circuit outputs a carry signal,
wherein the carry circuit supplies the carry signal to a k-th stage among the plurality of stages, and
wherein k is an integer that is not less than 2.

15. The display device of claim 14 , wherein the carry circuit receives a masking enable signal, and
wherein the masking enable signal has a first level in the first mode and the first partial frame and has a second level different from the first level during the plurality of second partial frames in the second mode.

16. The display device of claim 15 , wherein the first level is identical to a level of an activation period of each of the plurality of emission control signals, and
wherein the second level is identical to a level of a deactivation period of each of the plurality of emission control signals.

17. The display device of claim 15 , wherein the first partial frame or each of the plurality of second partial frames includes:
an active period;
a front porch period preceding the active period; and
a back porch period following the active period, and
wherein a level of the masking enable signal is changed during the front porch period or the back porch period.

18. The display device of claim 15 , wherein the masking enable signal is changed from the first level to the second level in synchronization with a point in time when a (k−1)-th emission control signal output from the (k−1)-th stage among the plurality of stages is deactivated, during a start partial frame, which is an initial partial frame from among the plurality of second partial frames, and is changed from the second level to the first level in synchronization with a point in time when the (k−1)-th emission control signal output from the (k−1)-th stage among the plurality of stages is activated, during a last partial frame, which is a last partial frame from among the plurality of second partial frames.

19. A display device comprising:
a display panel including a first display area, a second display area and a plurality of pixel disposed in the first and second display areas;
a data driver which outputs a plurality of data signals to the display panel;
a scan driver which outputs a plurality of scan signals to the display panel; and
a light emitting driver which outputs a plurality of emission control signals to the display panel,
wherein the display panel displays a first image on the first display area and the second display area in a first mode, and displays a second image on the first display area in a second mode, and
wherein each of the pixels includes:
a light-emitting element including a cathode and an anode;
a first transistor connected between a power line and the anode of the light-emitting element;
a second transistor which is connected between a data line and a first electrode of the first transistor and receives one of the plurality of scan signals; and
an emission control transistor which is connected between the power

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Taehoon
• Kwon Sangan
• Kim Soon-Dong
• Nam Hui
• Yun Eun Sil
• Yoon Changnoh

Classifications

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title