Display device with power management circuit for transforming period

Patent metadata

Field	Value
Publication number	US-11967260-B2
Application number	US-202217980195-A
Country	US
Kind code	B2
Filing date	Nov 3, 2022
Priority date	Dec 29, 2021
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A display device is disclosed that includes a display panel on which one or more sub-pixels including a light emitting device and a driving transistor for driving the light emitting device are disposed in a display area, and whose shape is changed during a transforming period, a timing controller for receiving image data and a command signal defining the transforming period, and converting the image data to output converted image data, and a data driving circuit for receiving the converted image data and outputting a data voltage, wherein, in the transforming period, at least one sub-pixel emits light based on the image data input to the timing controller, and emits light with a luminance lower than a luminance corresponding to a grayscale of the image data. Accordingly, there may be provided a display device capable of changing a shape during an image display period.

First claim

What is claimed is:

1. A display device comprising:
a display panel including one or more sub-pixels in a display area, the one or more sub-pixels having a light emitting device and a driving transistor configured to drive the light emitting device, and the display panel having a shape that is changed during a transforming period;
a timing controller configured to receive image data and a command signal defining the transforming period, the timing controller configured to convert the image data to output converted image data;
a data driving circuit configured to receive the converted image data and output a data voltage; and
a power management circuit configured to output a first initialization voltage applied to a first initialization voltage supply node and a low potential driving voltage to the display panel,
wherein, in the transforming period, at least one sub-pixel emits light based on the image data input to the timing controller, and emits light with a luminance that is less than a luminance corresponding to a grayscale of the image data,
wherein the command signal defines a transforming period and a normal state in which the shape of the display panel is fixed,
wherein a voltage level of the first initialization voltage output by the power management circuit during the transforming period is greater than a voltage level of the first initialization voltage output by the power management circuit in the normal state.

2. The display device of claim 1 , wherein, in the normal state, the display panel has a flat shape or a curved shape.

3. The display device of claim 2 , wherein, during the transforming period, the shape of the display device changes from the flat shape to the curved shape, or changes from the curved shape to the flat shape.

4. The display device of claim 1 , wherein the light emitting device comprises:
a first electrode electrically connected to the driving transistor;
a second electrode configured to be applied with a low potential driving voltage; and
a light emitting layer between the first electrode and the second electrode.

5. The display device of claim 4
wherein the first initialization voltage supply node is electrically connected to the first electrode of the light emitting device through a reference voltage line.

6. The display device of claim 4 , wherein the first initialization voltage is configured to initialize a voltage of the first electrode of the light emitting device when the data voltage is input to a gate node of the driving transistor.

7. The display device of claim 1 , wherein the timing controller further comprises:
a memory configured to store a value for compensating for a change in a characteristic value of the one or more sub-pixels,
wherein, in the transforming period, the timing controller compensates the at least one sub-pixel with a value different from the value stored in the memory.

8. The display device of claim 7 , wherein the timing controller is configured to convert the image data compensated with the value different from the value stored in the memory according to a preset interface and output the converted image data to the data driving circuit.

9. The display device of claim 1 , wherein the data driving circuit comprises at least one source driver integrated circuit, and the at least one source driver integrated circuit is mounted on a circuit film in a chip-on-film manner.

10. The display device of claim 9 , wherein the circuit film comprises:
one or more first pins configured to output the data voltage to the display panel;
one or more second pins configured to output a direct current (DC) voltage to the display panel;
one or more third pins electrically connected to the data driving circuit and to which image data converted according to a preset interface format is input; and
one or more fourth pins configured to receive the DC voltage and transmit the DC voltage to the one or more second pins.

11. The display device of claim 1 , wherein the at least one sub-pixel is located in a bending area where the display panel is bent.

12. The display device of claim 1 , wherein the display panel is bent to a preset angle during the transforming period.

13. The display device of claim 1 , further comprising:
a host system configured to output the image data and the command signal.

14. The display device of claim 1 , wherein, in the transforming period, the at least one sub-pixel emits light with a luminance that is less than a luminance corresponding to a grayscale of the converted image data.

15. The display device of claim 1 , wherein when a same image data is input to the timing controller during the normal state and the transforming period, the at least one sub-pixel emits light with a luminance in the transforming period that is less than a luminance in the transforming period.

16. The display device of claim 1 , wherein among the at least one sub-pixel, a degree of reducing luminance of at least one sub-pixel is different from another sub-pixel.

17. A display device comprising:
a display panel including one or more sub-pixels in a display area, the one or more sub-pixels having a light emitting device and a driving transistor configured to drive the light emitting device, and the display panel having a shape that is changed during a transforming period;
a timing controller configured to receive image data and a command signal defining the transforming period, the timing controller configured to convert the image data to output converted image data;
a data driving circuit configured to receive the converted image data and output a data voltage; and
a power management circuit configured to output a first initialization voltage applied to a first initialization voltage supply node and a low potential driving voltage to the display panel,
wherein, in the transforming period, at least one sub-pixel emits light based on the image data input to the timing controller, and emits light with a luminance that is less than a luminance corresponding to a grayscale of the image data,
wherein the command signal defines a transforming period and a normal state in which the shape of the display panel is fixed, and
wherein a voltage level of the low potential driving voltage output by the power management circuit during the transforming period is greater than a voltage level of the low potential driving voltage output by the power management circuit in the normal state.

18. A display device comprising:
a display panel including one or more sub-pixels in a display area, the one or more sub-pixels having a light emitting device and a driving transistor configured to drive the light emitting device, and the display panel having a shape that is changed during a transforming period;
a timing controller configured to receive image data and a command signal defining the transforming period, the timing controller configured to convert the image data to output converted image data; and
a data driving circuit configured to receive the converted image data and output a data voltage,
wherein the command signal defines the transforming period and a normal state in which the shape of the display panel is fixed,
wherein, in the transforming period, at least one sub-pixel emits light based on the image data input to the timing controller, and emits light with a luminance that is less than a luminance corresponding to a grayscale of the image data,
wherein the data driving circuit comprises at least one source driver integrated circuit, and the at least one source driver integrated circuit is m

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jinwon
• Hong Mookyoung

Classifications

• G09G3/035 Primary

  for flexible display surfaces · CPC title

• G09G3/2074 Primary

  using sub-pixels · CPC title

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G3/3283

  in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G3/32

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title