Systems and methods for controlling dual modulation displays

Patent metadata

Field	Value
Publication number	US-10899599-B2
Application number	US-201916271696-A
Country	US
Kind code	B2
Filing date	Feb 8, 2019
Priority date	Jun 15, 2012
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

In one embodiment, a dual modulator display systems and methods for rendering target image data upon the dual modulator display system are disclosed where the display system receives target image data, possible HDR image data and first calculates display control signals and then calculates backlight control signals from the display control signals. This order of calculating display signals and then backlight control signals later as a function of the display systems may tend to reduce clipping artifacts. In other embodiments, it is possible to split the input target HDR image data into a base layer and a detail layer, wherein the base layer is the low spatial resolution image data that may be utilized as for backlight illumination data. The detail layer is higher spatial resolution image data that may be utilized for display control data.

First claim

The invention claimed is:

1. A display system, said display system comprising:
a backlight, said backlight configured to emit a locally dimmable light field according to backlight control signals;
a set of modulating elements, said modulating elements individually controlled by display control signals;
a controller, said controller configured to receive target image data and to send emitter control signals, the backlight control signals, and the display control signals, the controller further configured to:
receive target image data;
calculate the display control signals;
calculate target backlight illumination data from the display control signals and the target image data;
calculate the backlight control signals from said target backlight illumination data;
send the backlight control signals to the backlight;
and send the display control signals to the modulating elements.

2. The display system of claim 1 wherein said controller further configured to determine a display modulator layer image data by tone mapping said target image data.

3. The display system of claim 2 wherein said controller further configured to determine a backlight layer image data by dividing said target image data by said display modulator layer image data.

4. The display system of claim 3 wherein said controller further configured to send the backlight control signals as a function of the display modulator layer image data.

5. The display system of claim 4 wherein said controller further configured to send display control signals as a function of said display modulator layer image data.

Assignees

• Dolby Laboratories Licensing Corp

Inventors

• Atkins Robin
• Ward Rabab K

Classifications

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G3/3426

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• H04N21/440227

  by decomposing into layers, e.g. base layer and one or more enhancement layers · CPC title

• G09G2320/0238

  Improving the black level · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title