Luminance control unit and display device including the same

Patent metadata

Field	Value
Publication number	US-11450266-B2
Application number	US-202117531633-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Mar 20, 2019
Publication date	Sep 20, 2022
Grant date	Sep 20, 2022

Abstract

A luminance control unit includes: a driving power voltage setting unit configured to determine a driving power voltage to be provided to a display panel, the driving power voltage corresponding to a target brightness, based on a plurality of driving power voltages respectively corresponding to a plurality of reference brightnesses of the display panel; and a gamma voltage setting unit configured to determine a target luminance corresponding to the target brightness, based on a plurality of target luminances respectively corresponding to the plurality of reference brightnesses, and to set gamma voltages for implementing the target luminance, wherein the driving power voltage and the gamma voltages are differently set with respect to the same reference brightness according to an ambient illumination intensity of the display panel.

First claim

What is claimed is:

1. A luminance control unit comprising:
a driving power voltage determiner configured to determine a driving power voltage to be provided to a display panel, the driving power voltage corresponding to a target brightness, based on a plurality of driving power voltages respectively corresponding to a plurality of reference brightnesses of the display panel; and
a gamma voltage setting unit configured to determine a target luminance corresponding to the target brightness, based on a plurality of target luminances respectively corresponding to the plurality of reference brightnesses, and to set gamma voltages for implementing the target luminance,
wherein the reference brightnesses are set according to an ambient illumination intensity of the display panel.

2. The luminance control unit of claim 1 , wherein, when the ambient illumination intensity is less than an illumination intensity threshold value, a maximum value of the reference brightnesses is set smaller than a maximum reference brightness of the display panel.

3. The luminance control unit of claim 1 , wherein the driving power voltage is differently set with respect to a same reference brightness according to the ambient illumination intensity.

4. The luminance control unit of claim 3 , wherein the driving power voltage determiner is configured to equally set the driving power voltage as a threshold driving power voltage, corresponding to reference brightnesses greater than a threshold brightness, in response to the ambient illumination intensity being less than an illumination intensity threshold value.

5. The luminance control unit of claim 4 , wherein the threshold brightness is a minimum value of reference brightnesses with which an abnormal output is not viewed on the display panel when the display panel is driven by the threshold driving power voltage.

6. The luminance control unit of claim 1 , wherein the gamma voltages are differently set with respect to a same reference brightness according to the ambient illumination intensity.

7. The luminance control unit of claim 6 , further comprising a luminance modulator configured to correct the gamma voltages in response to an Average Pixel Level (APL) of input image data being greater than or equal to an APL threshold value.

8. The luminance control unit of claim 7 , wherein the luminance modulator is configured to determine a correction luminance with respect to the target luminance, based on the target brightness, and to correct the gamma voltages to implement the correction luminance.

9. The luminance control unit of claim 8 , wherein the luminance modulator is configured to equally set the correction luminance, corresponding to reference brightnesses greater than a threshold brightness, in response to the ambient illumination intensity being less than an illumination intensity threshold value.

10. The luminance control unit of claim 8 , wherein the luminance modulator is configured to set the correction luminance such that a difference between the correction luminance and the target luminance with respect to a maximum value of the reference brightnesses corresponds to a threshold correction offset, in response to the ambient illumination intensity being less than an illumination intensity threshold value.

11. A luminance control unit comprising:
a driving power voltage determiner configured to determine a driving power voltage to be provided to a display panel, the driving power voltage corresponding to a target brightness, based on a plurality of driving power voltages respectively corresponding to a plurality of reference brightnesses of the display panel; and
a gamma voltage setting unit configured to determine a target luminance corresponding to the target brightness, based on a plurality of target luminances respectively corresponding to the plurality of reference brightnesses, and to set gamma voltages for implementing the target luminance,
wherein the driving power voltage is differently set with respect to a same reference brightness according to an ambient illumination intensity of the display panel.

12. The luminance control unit of claim 11 , wherein the driving power voltage determiner is configured to equally set the driving power voltage as a threshold driving power voltage, corresponding to reference brightnesses greater than a threshold brightness, in response to the ambient illumination intensity being less than an illumination intensity threshold value.

13. A luminance control unit comprising:
a driving power voltage determiner configured to determine a driving power voltage to be provided to a display panel, the driving power voltage corresponding to a target brightness, based on a plurality of driving power voltages respectively corresponding to a plurality of reference brightnesses of the display panel; and
a gamma voltage setting unit configured to determine a target luminance corresponding to the target brightness, based on a plurality of target luminances respectively corresponding to the plurality of reference brightnesses, and to set gamma voltages for implementing the target luminance,
wherein the gamma voltages are differently set with respect to a same reference brightness according to an ambient illumination intensity of the display panel.

Assignees

• Samsung Display Co Ltd

Inventors

• Pyo Si Beak
• Kim Sung Kook

Classifications

• G09G2320/0673

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

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2320/0276

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

• G09G3/3233

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