Display device and method for displaying image

Patent metadata

Field	Value
Publication number	US-2025022438-A1
Application number	US-202418420518-A
Country	US
Kind code	A1
Filing date	Jan 23, 2024
Priority date	Jul 12, 2023
Publication date	Jan 16, 2025
Grant date	—

Abstract

A display device includes a first display driver circuit that outputs a first gamma reference voltage to a first display panel, and a second display driver circuit that outputs a second gamma reference voltage to a second display panel different from the first display panel, and determines the difference between the first gamma reference voltage and the second gamma reference voltage, and keeps outputting the second gamma reference voltage when the difference is smaller than a first reference value, and changes the second gamma reference voltage when the second gamma reference voltage is less than the first gamma reference voltage and the difference is equal to or greater than the first reference value.

First claim

What is claimed is:

1 . A display device comprising:
a first display driver circuit configured to output a first gamma reference voltage to a first display panel; and a second display driver circuit configured to output a second gamma reference voltage to a second display panel different from the first display panel and to determine a difference between the first gamma reference voltage and the second gamma reference voltage, wherein the second display driver circuit is configured to output the second gamma reference voltage when the difference is smaller than a first reference value, and change the second gamma reference voltage when the second gamma reference voltage is less than the first gamma reference voltage and the difference is equal to or greater than the first reference value.

2 . The display device of claim 1 , wherein the second display driving circuit includes:
an analog-to-digital converter configured to generate a first sampling value and a second sampling value by performing sampling on the first gamma reference voltage and the second gamma reference voltage; and a controller configured to determine the difference by comparing the first sampling value and the second sampling value.

3 . The display device of claim 1 , further comprising:
a processor configured to transmit first image data to the first display driver circuit and transmit second image data to the second display driver circuit, wherein the first display driving circuit is configured to generate a first data signal based on the first image data, using the first gamma reference voltage and output the first data signal to source lines, and the second display driving circuit is configured to generate a second data signal based on the second image data, using the second gamma reference voltage, and output the second data signal to the source lines.

4 . The display device of claim 3 , wherein
when the difference is equal to or greater than a second reference value, the second display driving circuit is configured to transmit the difference to the processor, and the processor is configured to control opening and closing of switches of the first display driver circuit and switches of the second display driver circuit, on the basis of the difference, and the second reference value is greater than the first reference value.

5 . The display device of claim 4 , wherein
when the first gamma reference voltage is less than the second gamma reference voltage, the processor is configured to control opening and closing of the switches of the first display driver circuit and the switches of the second display driver circuit to transfer the second gamma reference voltage to the first display driver circuit, and when the second gamma reference voltage is less than the first gamma reference voltage, the processor is configured to control opening and closing of the switches of the first display driver circuit and the switches of the second display driver circuit to transfer the first gamma reference voltage to the second display driver circuit.

6 . The display device of claim 1 , wherein
when the second gamma reference voltage is less than the first gamma reference voltage and the difference is equal to or greater than the first reference value, the second display driver circuit is configured to amplify the second gamma reference voltage on the basis of the difference.

7 . The display device of claim 1 , wherein
when the second gamma reference voltage is less than the first gamma reference voltage and the difference is equal to or greater than a second reference value, the second display driver circuit is configured to receive the first gamma reference voltage from the first display driver circuit and output the first gamma reference voltage instead of the second gamma reference voltage, and the second reference value is greater than the first reference value.

8 . The display device of claim 7 , wherein
the second display driving circuit includes a multiplexer configured to receive the first gamma reference voltage and the second gamma reference voltage and output the first gamma reference voltage in response to a selection signal.

9 . The display device of claim 1 , wherein
when the first gamma reference voltage is less than the second gamma reference voltage and the difference is equal to or greater than the first reference value, the second display driver circuit is configured to output the difference such that the first display driver circuit amplifies the first gamma reference voltage on the basis of the difference.

10 . The display device of claim 1 , wherein
when the first gamma reference voltage is less than the second gamma reference voltage and the difference is equal to or greater than a second reference value, the second display driver circuit is configured to output the second gamma reference voltage to the first display driver circuit, and the second reference value is greater than the first reference value.

11 . A display device comprising:
a first display panel configured to emit first image light based on first image data, using a first gamma reference voltage; a second display panel configured to emit second image light based on second image data, using a second gamma reference voltage; and a processor configured to generate the first image data and the second image data and control the gamma reference voltage of the first display panel or the second display panel, on the basis of a difference between the first gamma reference voltage and the second gamma reference voltage.

12 . The display device of claim 11 , wherein
one of the first display panel and the second display panel is a master panel, the master panel is configured to determine the difference between the first gamma reference voltage and the second gamma reference voltage and transmit the difference to the processor.

13 . The display device of claim 12 , wherein
when the first gamma reference voltage is higher than the second gamma reference voltage, the processor is configured to set the first display panel as the master panel and set the second display panel as a slave panel, and when the first gamma reference voltage is less than the second gamma reference voltage, the processor is configured to set the second display panel as the master panel and set the first display panel as the slave panel.

14 . The display device of claim 11 , wherein
the first display panel includes: a pixel array configured to emit first image light based on a first data signal; an analog-to-digital converter configured to generate a first sampling value by sampling the first data signal; and a display driver circuit configured to generate the first data signal based on the first image data, using the first gamma reference voltage, receive the first sampling value from the analog-to-digital converter, receive a second sampling value from the second display panel, and determine a difference between the first sampling value and the second sampling value as the difference between the first gamma reference voltage and the second gamma reference voltage.

15 . The display device of claim 14 , wherein
the display driving circuit, the pixel array, and the analog-to-digital converter are coupled through a plurality of source lines, and the analog-to-digital converter is configured to receive the first data signal from the pixel array through the plurality of source lines.

16 . The display device of claim 14 , wherein
the pixel array includes a dummy array configured to emit black-level light based on a dumm

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Choonghoon
• Kim Minsung
• Park Sung-Jin
• Baek Seung-Hoon
• Cho Jeong

Classifications

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G2320/0276

  for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction · CPC title

• G09G2300/0413

  Details of dummy pixels or dummy lines in flat panels · CPC title

• H04N13/332

  Displays for viewing with the aid of special glasses or head-mounted displays [HMD] · CPC title

• H04N13/106

  Processing image signals (for multi-view video sequence encoding H04N19/597) · CPC title