Device for displaying images comprising two modulation stages

Patent metadata

Field	Value
Publication number	US-11488545-B2
Application number	US-45205208-A
Country	US
Kind code	B2
Filing date	Jun 10, 2008
Priority date	Jun 13, 2007
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

Device comprising:
a rear panel comprising a network of backlighting elements, a front panel comprising a network of optical valves which are each capable of modulating the brightness of a single primary colour.

By the modulation of chrominance which is added to the modulation of luminance for the backlighting elements of the rear panel, the device according to the invention makes it possible to display the images with even more contrast and better quality. A specific control mode makes it possible to avoid the colour “interferences”.

First claim

The invention claimed is:

1. A method of displaying at least one image, the method comprising:
modulating luminance and chrominance of a network of backlighting elements associated with a rear panel of a display, wherein the modulating of the luminance and chrominance is a function of display data corresponding to pixels of an image, the luminance and chrominance modulated backlighting elements each generating primary colors;
optically coupling of each of the backlighting elements of the rear panel to a group of a plurality of elementary sets of optical valves associated with a front panel, wherein each of the elementary sets of optical valves includes one optical valve for each of the primary colors, wherein each of the elementary sets of optical valves displays a pixel of the image; and
modulating, using each of the optical valves of the group, a brightness associated with each of the generated primary colors received from each of the backlighting elements;
wherein modulating the brightness of each optical valve of the group is a function of display datum associated with a pixel of the image corresponding to an elementary set of the group to which the optical valve belongs, and
wherein the brightness of each of the optical valves of the group is modulated as a function of display datum associated with a pixel of the image corresponding to other elementary sets within the group.

2. The method of claim 1 , wherein the brightness of each of the optical valves of the group is further modulated as a function of display datum associated with a pixel of the image corresponding to at least one other elementary set than the elementary set of the group to which the optical valve belongs.

3. The method of claim 1 , wherein each backlighting element comprises one emitter for each of the generated primary colors.

4. The method of claim 1 , wherein
a brightness modulation factor

[

R
Mod

G
Mod

B
Mod

]

of each of the optical valves of the group conforms to

[

X

Y

Z

]

=

xyz

3
×
N

·

(

rgb

3
×
N

LED
T

⁡

[

R
LED

G
LED

B
LED

]

·

*

rgb

3
×
N

Mod
T

⁡

[

R
Mod

G
Mod

B
Mod

⁢

]

)

,

where

[

X

Y

Z

]

,

represents a color vector of the display datum associated with a pixel of the image,
where

[

R

Assignees

• Chevallier Louis
• Vigouroux Jean Ronan
• Kervec Jonathan
• Benoit Pascal
• Interdigital Madison Patent Holdings Sas

Inventors

• Chevallier Louis
• Vigouroux Jean-Ronan
• Kervec Jonathan
• Benoit Pascal

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0646

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

• G09G3/34

  by control of light from an independent source · CPC title

• G09G2320/0271

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

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title