Display device and method for operating same
The present invention relates to a display device having a more improved variable refresh rate (VRR) function, and comprises: a control unit for executing a variable refresh rate (VRR) function of adjusting a screen refresh rate according to an image signal; and a display unit for outputting an image according to the screen refresh rate, wherein the control unit can increase the screen refresh rate adjusted according to the image signal.
1. A display device comprising:
a display,
a controller operatively connected to the display,
wherein the controller is configured to:
receive a sequence of images,
extract, from each image of the sequence of images, an image specific frequency of a vertical synchronizing signal of a corresponding image,
determine whether or not one of the extracted image specific frequencies is below a threshold frequency while another one of the extracted image specific frequencies is not below the threshold frequency, and
upon determining that one of the extracted image specific frequencies is below the threshold frequency while the another one of the extracted image specific frequencies is not below the threshold frequency:
increase an image specific screen refresh rate of all images of the sequence of images by a common factor, and
control the display to display the sequence of images with the image specific screen refresh rate that has been increased by the common factor.
2. The display device of claim 1 , wherein the threshold frequency is 55 Hz.
3. The display device of claim 1 , wherein the controller is configured to:
upon determining that none of the extracted image specific frequencies is below the threshold frequency:
maintain the image specific screen refresh rate of all images of the sequence of images, and
control the display to display the sequence of images with the image specific screen refresh rate that has been maintained.
4. The display device of claim 1 , wherein the image specific frequency of the vertical synchronizing signal is extracted based on an image specific number of frames per second.
5. The display device of claim 4 , wherein the controller includes:
an image decoder to acquire the image specific number of frames per second by decoding the image signal, and to acquire the image specific screen refresh rate based on the image specific number of frames per second; and
a frame rate converter to increase the image specific screen refresh rate acquired by the common factor, and
wherein the display includes a backlight unit and a backlight dimming controller that are driven based on the image specific screen refresh rate of all images of the sequence of images that has been increased by the common factor.
6. The display device of claim 1 , wherein the controller is configured to:
increase an operating frequency of a backlight unit provided in the display based on the increase of the image specific screen refresh rate.
7. The display device of claim 1 , wherein the controller is configured to:
increase a frequency for calculating local dimming data based on the increase of the image specific screen refresh rate.
8. The display device of claim 7 , wherein the controller is configured to:
apply local dimming to the sequence of images based on the increase of the image specific screen refresh rate.
9. The display device of claim 1 , further comprising:
an external device interface connected to an external device which provides the sequence of images.
10. An operating method of a display device, the operating method comprising:
receiving a sequence of images;
extracting, from each image of the sequence of images, an image specific frequency of a vertical synchronizing signal of a corresponding image;
determining whether or not one of the extracted image specific frequencies is below a threshold frequency while another one of the extracted image specific frequencies is not below the threshold frequency; and
upon determining that one of the extracted image specific frequencies is below the threshold frequency while the another one of the extracted image specific frequencies is not below the threshold frequency:
increasing an image specific screen refresh rate of all images of the sequence of images by a common factor; and
displaying the sequence of images with the image specific screen refresh rate that has been increased by the common factor.