Display device and method of driving the same, and electronic device including display device

Patent metadata

Field	Value
Publication number	US-12482408-B2
Application number	US-202418740095-A
Country	US
Kind code	B2
Filing date	Jun 11, 2024
Priority date	Jun 15, 2023
Publication date	Nov 25, 2025
Grant date	Nov 25, 2025

Abstract

A display device includes: a power supply configured to supply a voltage of first driving power to a first power line, and supply a voltage of second driving power to a second power line; a display panel including pixels connected to scan lines and data lines, and each including a first transistor configured to control current supplied from the first power line to the second power line via a light emitting element; and a timing controller configured to supply a luminance control signal to the pixels. Each of the pixels includes: a control transistor connected in parallel to some sub-transistors of the corresponding first transistor, and configured to be turned on in response to receipt of a luminance control signal having an enabled state. The power supply changes the voltage of the second driving power when the luminance control signal having the enabled state is supplied to the pixels.

First claim

What is claimed is:

1 . A display device, comprising:
a power supply configured to supply a voltage of first driving power to a first power line, and supply a voltage of second driving power to a second power line; a display panel comprising pixels connected to scan lines and data lines, and each of the pixels including a first transistor configured to control an amount of current supplied from the first power line to the second power line via a light emitting element; and a timing controller configured to supply a luminance control signal to the pixels, wherein each of the pixels further comprises: a control transistor connected in parallel to some sub-transistors of the corresponding first transistor, and configured to be turned on in response to receipt of the luminance control signal having an enabled state, wherein the power supply changes the voltage of the second driving power when the luminance control signal having the enabled state is supplied to the pixels.

2 . The display device according to claim 1 , wherein the power supply increases the second driving power from a first voltage to a second voltage higher than the first voltage when the luminance control signal changes from a disabled state to the enabled state.

3 . The display device according to claim 2 , wherein the power supply maintains the second driving power at the second voltage for a period of time and then gradually decreases the second driving power to a third voltage lower than the second voltage.

4 . The display device according to claim 3 , wherein the third voltage is identical to the first voltage.

5 . The display device according to claim 3 , wherein the third voltage is different from the first voltage.

6 . The display device according to claim 3 , wherein the power supply further supplies first initialization power for initializing a gate electrode of the first transistor to the pixels.

7 . The display device according to claim 6 , wherein the power supply increases the first initialization power from a first initialization voltage to a second initialization voltage higher than the first initialization voltage when the luminance control signal changes from the disabled state to the enabled state.

8 . The display device according to claim 7 , wherein the power supply maintains the first initialization power at the second initialization voltage for the period of time and then gradually decreases the first initialization power to a third initialization voltage lower than the second initialization voltage.

9 . The display device according to claim 1 , wherein the power supply decreases the second driving power from a first voltage to a second voltage lower than the first voltage when the luminance control signal changes from the enabled state to a disabled state.

10 . The display device according to claim 9 , wherein the power supply maintains the second driving power at the second voltage for a period of time and then gradually increases the second driving power to a third voltage higher than the second voltage.

11 . The display device according to claim 10 , wherein the power supply further supplies first initialization power for initializing a gate electrode of the first transistor to the pixels.

12 . The display device according to claim 11 , wherein the power supply decreases the first initialization power from a first initialization voltage to a second initialization voltage lower than the first initialization voltage when the luminance control signal changes from the enabled state to the disabled state.

13 . The display device according to claim 12 , wherein the power supply maintains the first initialization power at the second initialization voltage for the period of time and then gradually increases the first initialization power to a third initialization voltage higher than the second initialization voltage.

14 . The display device according to claim 1 , further comprising a plurality of emission control lines connected to the pixels,
wherein each of the pixels is controlled during an emission time by an emission control signal supplied to the corresponding emission control line connected thereto.

15 . The display device according to claim 14 , further comprising an emission driver configured to supply an emission control signal to the emission control lines,
wherein the emission driver simultaneously supplies the emission control signal having a disabled state to the emission control lines to prevent the pixels from emitting light when the luminance control signal changes from a disabled state to the enabled state.

16 . The display device according to claim 15 , wherein the emission driver simultaneously supplies the emission control signal having the disabled state to the emission control lines when the luminance control signal changes from the enabled state to the disabled state.

17 . The display device according to claim 1 , wherein each of the pixels comprises:
the light emitting element including a second electrode electrically connected to the second power line; the first transistor including the plurality of sub-transistors connected in series between a first node and a second node, the first node being electrically connected to the first power line during an emission period in which the light emitting element emits light, and the second node being electrically connected to a first electrode of the light emitting element during the emission period; and the control transistor connected a common node between the first node and the sub-transistors, with a gate electrode connected to a control line, and configured to be turned on when the luminance control signal having the enabled state is supplied to the control line, and turned off when the luminance control signal having a disabled state is supplied to the control line.

18 . The display device according to claim 17 , wherein each of the pixels comprises:
a second transistor connected between a data line and the first node, and including a gate electrode electrically connected to a first scan line; a third transistor connected between the second node and a third node to which gate electrodes of the sub-transistors are connected, and including a gate electrode electrically connected to a second scan line; a fourth transistor connected between the third node and a third power line configured to receive first initialization power, and including a gate electrode electrically connected to a third scan line; a fifth transistor connected between the first power line and the first node, and including a gate electrode electrically connected to an emission control line; a sixth transistor connected between the second node and the first electrode of the light emitting element, and including a gate electrode electrically connected to the emission control line; and a seventh transistor connected between the first electrode of the light emitting element and a fourth power line configured to receive second initialization power, and including a gate electrode electrically connected to a fourth scan line.

19 . The display device according to claim 17 , wherein the control line is connected in common to the control transistors included in the respective pixels.

20 . The display device according to claim 17 , including a first mode in which a maximum luminance of the display panel is set to a first luminance, and a second mode in which a maximum luminance of the display panel is set to a second luminance higher than the first luminance,

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Sung Hwan
• Kwak Won Kyu
• Jang Hwan Soo
• Choe Seo Won

Classifications

• G09G2310/0275

  Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current · CPC title

• G09G2330/021

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

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2310/0267

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