Display apparatus

Patent metadata

Field	Value
Publication number	US-12118945-B2
Application number	US-202318545507-A
Country	US
Kind code	B2
Filing date	Dec 19, 2023
Priority date	Jan 27, 2023
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A display apparatus includes a data driving portion having a plurality of driving portions corresponding to a plurality of split regions of a display panel, a gamma voltage portion providing a same gamma voltage set to the plurality of driving portions, and a data processing portion including a data adjustment portion and a maximum dimming signal extraction portion. The data adjustment portion can process a plurality of input image data corresponding to the plurality of split regions to output a plurality of output image data to the plurality of driving portions, and the maximum dimming signal extraction portion can provide a maximum dimming signal among a plurality of dimming signals for the plurality of split regions to the gamma voltage portion.

First claim

What is claimed is:

1. A display apparatus, comprising:
a display panel including a plurality of split regions defined by dividing a screen;
a data driving portion including a plurality of driving portions respectively corresponding to the plurality of split regions;
a gamma voltage portion configured to provide a same gamma voltage set to the plurality of driving portions; and
a data processing portion including a data adjustment portion and a maximum dimming signal extraction portion,
wherein the data adjustment portion processes a plurality of input image data respectively corresponding to the plurality of split regions to output a plurality of output image data to the plurality of driving portions,
wherein the maximum dimming signal extraction portion provides a maximum dimming signal among a plurality of dimming signals that respectively set luminances of the plurality of split regions to the gamma voltage portion, and
wherein the data adjustment portion converts a luminance gain of each of the plurality of split regions obtained based on the maximum dimming signal into a data gain, and applies each data gain to one of the plurality of input image data.

2. The display apparatus of claim 1 , wherein in a normal mode where the plurality of dimming signals are the same, the data adjustment portion outputs the plurality of input image data as the plurality of output image data through a bypass transmission path, and
wherein in a luminance split mode where at least two of the plurality of dimming signals are different from each other, the data adjustment portion applies each data gain to one of the plurality of input image data to output the plurality of output image data.

3. The display apparatus of claim 1 , wherein each of the luminance gain and the data gain has K bits, and the input image data has M bits, where K and M are natural numbers, and
wherein the data adjustment portion includes:
a data operation portion which performs a multiplication of each data gain by each of the plurality of input image data to generate a plurality of intermediate image data of M+K bits; and
a bit shift portion which shifts the M+K bits of each of the plurality of intermediate image data by the K bits in a lower bit direction to generates the plurality of output image data of the M bits.

4. The display apparatus of claim 1 , wherein the data adjustment portion includes a data gain calculation portion that converts the luminance gain into the data gain according to a gamma value relationship between luminance and data.

5. The display apparatus of claim 4 , wherein the data gain calculation portion includes:
a luminance gain calculation portion that divides each of the plurality of dimming signals by the maximum dimming signal to calculate the luminance gain; and
a luminance gain-data gain conversion portion that converts the luminance gain calculated by the luminance gain calculation portion into the corresponding data gain.

6. The display apparatus of claim 1 , wherein the plurality of split regions are arranged along a horizontal line direction of the display panel.

7. The display apparatus of claim 1 , wherein the display panel is an organic light emitting display panel.

8. A display apparatus, comprising:
a display panel including a plurality of split regions defined by dividing a screen;
a data driving portion including a plurality of driving portions respectively driving the plurality of split regions;
a gamma voltage portion configured to provide a same gamma voltage set to the plurality of driving portions; and
a data processing portion that provides a maximum dimming signal among a plurality of dimming signals that respectively correspond to the plurality of split regions to the gamma voltage portion,
wherein in a luminance split mode where at least two of the plurality of dimming signals are different from each other, the data processing portion applies each data gain to an input image data of one of the plurality of split regions to output a plurality of output image data to the plurality of driving portions, and
wherein the data processing portion converts a luminance gain of each of the plurality of split regions obtained based on the maximum dimming signal into the data gain according to a luminance-data gamma value relationship.

9. The display apparatus of claim 8 , wherein in a normal mode where the plurality of dimming signals are the same, the data adjustment portion outputs the plurality of input image data as the plurality of output image data through a bypass transmission path.

10. The display apparatus of claim 8 , wherein each of the luminance gain and the data gain has K bits, and the input image data has M bits, where K and M are natural numbers, and wherein the data processing portion performs a multiplication of each data gain by each of the plurality of input image data to generate a plurality of intermediate image data of M+K bits, and shifts the M+K bits of each of the plurality of intermediate image data by the K bits in a lower bit direction to generates the plurality of output image data of the M bits.

11. The display apparatus of claim 8 , wherein the data processing portion divides each of the plurality of dimming signals by the maximum dimming signal to calculate the luminance gain.

12. The display apparatus of claim 8 , wherein the plurality of split regions are arranged along a horizontal line direction of the display panel.

13. The display apparatus of claim 8 , wherein the display panel is an organic light emitting display panel.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Won-Hee
• Park Ji-Woong

Classifications

• G09G2320/0646

  Modulation of illumination source brightness and image signal correlated to each other · CPC title

• G09G3/3696

  Generation of voltages supplied to electrode drivers · CPC title

• G09G3/3685

  Details of drivers for data electrodes · CPC title

• G09G3/3622

  using a passive matrix (G09G3/3674 - G09G3/3696 take precedence) · CPC title

• G09G3/3291

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