Display apparatus and vehicle display apparatus including the same

Patent metadata

Field	Value
Publication number	US-11436966-B2
Application number	US-202117366909-A
Country	US
Kind code	B2
Filing date	Jul 2, 2021
Priority date	Jul 23, 2020
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The present disclosure provides a display apparatus including a display panel displaying an image, a driver driving the display panel, and a controller controlling the driver, wherein the controller converts an RGB data signal supplied from the outside into a YCbCr data signal, and performs image processing based on a gain determination graph having a horizontal asymmetric gain value with respect to a reference point, to enhance brightness of the YCbCr data signal.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel displaying an image;
a driver driving the display panel; and
a controller controlling the driver,
wherein the controller converts an RGB data signal supplied from the outside into a YCbCr data signal, and performs image processing based on a gain determination graph having a horizontal asymmetric gain value with respect to a reference point, to enhance brightness of the YCbCr data signal,
wherein the gain determination graph has a gain value which progressively increases as a gray level increases, for enhancing low gray level expressivity and a contrast of an image in 20% or less of an average picture level, and has the gain value which progressively decreases as the gray level increases, for minimizing a collection of high gray levels of an image and enhancing high gray level expressivity in 20% or more of the average picture level.

2. The display apparatus of claim 1 , wherein the controller comprises:
a first converter converting the RGB data signal into the YCbCr data signal; and
a calculator calculating a brightness component and a color component in the YCbCr data signal and calculating a first average picture level and a second average picture level in the brightness component.

3. The display apparatus of claim 2 , wherein the controller comprises:
a brightness enhancer enhancing brightness of the YCbCr data signal on the basis of the second average picture level; and
a local contrast enhancer enhancing a local contrast of the YCbCr data signal on the basis of the brightness component and the first average picture level each output from the calculator and the brightness gain output from the brightness enhancer.

4. The display apparatus of claim 3 , wherein the controller comprises:
a colorfulness enhancer enhancing a color component of the YCbCr data signal on the basis of an enhanced brightness component output from the local contrast enhancer and the color component output from the calculator; and
a second converter combining the enhanced brightness component, output from the local contrast enhancer, with an enhanced color component output from the colorfulness enhancer and converting a YCbCr data signal format into an RGB data signal format to output a converted signal.

5. The display apparatus of claim 2 , wherein the controller further comprises an illuminance determiner determining whether external light is higher than preset illuminance, on the basis of a sensing value transferred from an illuminance sensor,
wherein, when the sensing value is greater than or equal to an internal set value, the illuminance determiner operates the first converter.

6. The display apparatus of claim 1 , wherein,
the reference point is defined to have a high gain value in a part of a low gray level, and
the horizontal asymmetric gain value is defined to have a lower gain value than the gain value at the reference point.

7. The display apparatus of claim 1 , wherein, in the gain determination graph, the gain value for expressing the low gray level is higher than the gain value for expressing the high gray level.

8. The display apparatus of claim 1 , wherein,
when brightness of a center pixel is brighter than average brightness of a peripheral pixel in an average brightness component of N×M (where N and M is an integer of 3 or more) pixel blocks corresponding to the YCbCr data signal, the controller increases the brightness of the center pixel to enhance a local contrast of the YCbCr data signal, and
when the brightness of the center pixel is not brighter than the average brightness of the peripheral pixel in the average brightness component, the controller decreases the brightness of the center pixel.

9. The display apparatus of claim 1 , wherein the controller varies a weight of each color on the basis that a saturation range for each hue differs, to enhance colorfulness of a color component of the YCbCr data signal.

10. A vehicle display apparatus comprising:
a display apparatus including a display panel displaying an image, a driver driving the display panel, and a controller controlling the driver; and
an illuminance sensor sensing external light outside a vehicle,
wherein, when a sensing value transferred from the illuminance sensor is greater than or equal to an internal set value, the controller converts an RGB data signal supplied from the outside into a YCbCr data signal, and performs image processing on the basis of a gain determination graph having a gain value which is horizontally asymmetric with respect to a reference point, for enhancing brightness of the YCbCr data signal,
wherein the gain determination graph has a gain value which progressively increases as a gray level increases to enhance low gray level expressivity and a contrast of an image in 20% or less of an average picture level, and has a gain value which progressively decreases as a gray level increases to minimize a collection of high gray levels of an image and enhance high gray level expressivity in 20% or more of the average picture level.

Assignees

• Lg Display Co Ltd

Inventors

• Shin Hong Seop
• Kwon Hyeok Jun
• Yang Chang Mo

Classifications

• B60K35/80

  Arrangements for controlling instruments · CPC title

• B60K35/22 Primary

  Display screens · CPC title

• G09G2360/144

  the light being ambient light · CPC title

• G09G3/32

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

• G09G2320/066

  for control of contrast · CPC title