Multi primary color display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-9153180-B2
Application number	US-201213538945-A
Country	US
Kind code	B2
Filing date	Jun 29, 2012
Priority date	Jun 29, 2012
Publication date	Oct 6, 2015
Grant date	Oct 6, 2015

Abstract

A display device is configured for two-field sequential operation using a multi-colored backlight and an array of selectable filters where the array includes a subpixel repeat group having more than three non-white colors. The display device includes: an array of filters for defining pixels of an image, wherein each subpixel repeat group in the array comprises at least four non-white filters and at least one white filter; a backlight module comprising an array of at least four non-white light emitting diodes; and a control unit configured to operate the array of filters and the backlight module in a two-field sequential operation scheme such that for each subpixel repeat group in the array, most of the filters are usable (for having valved light passed therethrough) in both fields, two of the filters are usable on a mutually exclusive, and at least one filter is usable only in one of the fields.

First claim

What is claimed is:

1. A display device comprising a backlighting panel and a light-valving panel configured for producing images, wherein:
the backlighting panel is operatively coupled to the light-valving panel such that lights from different light sources included in the backlighting panel can be simultaneously and mixedly supplied to respective ones of repeat group areas of the light-valving panel, and wherein
the light-valving panel includes:
a respective array of individually controlled light-valving cells;
a respective array of differently colored or uncolored filters respectively overlapping the respective and individually controlled light-valving cells, said differently colored ones of the filters comprising at least four differently colored non-white filters and said uncolored filters comprising at least one white or clear filter, each combination of filter and corresponding light-valving cell defining a respective Filtered Optical Valve Unit (FOVU) through which can pass a correspondingly filtered portion of the backlighting supplied thereto from the backlighting panel, with plural ones of said FOVU's being respectively grouped into each of said repeat group areas of the light-valving panel, each repeat group area defining a pixel and having a repeating same color pattern of said FOVU's; and wherein

the backlighting panel includes:
a respective backlight module comprising an array of said different light sources where the array includes at least four non-white and differently colored as well as individually controlled light sources; and wherein the display device further comprises:

a control unit operatively coupled to, and configured to selectively operate the respective array of light-valving cells and the respective backlighting module in accordance with a two-field sequential operation scheme such that:
a first subset of at least two of the differently colored FOVU's of each corresponding repeat group area are operable in both of the two fields, and
a second subset of at least two others of the differently colored FOVU's of each corresponding repeat group area are only operable on a mutually exclusive basis over the respective two fields.

2. The display device according to claim 1 , wherein a FOVU corresponding to the at least one white filter is operable by the control unit in both of the two fields.

3. The display device according to claim 1 , wherein the second subset of FOVU's comprises a blue color filter and a cyan color filter such that the FOVU corresponding to the blue color filter is operable by the control unit only in the first field and the FOVU corresponding to the cyan color filter is operable by the control unit only in the second field.

4. The display device according to claim 1 , wherein the at least four differently colored non-white filters include a red color filter and a green color filter and wherein in each field a red color FOVU and a green color FOVU are both operable by the control unit.

5. The display device according to claim 1 , wherein the control unit is further configured to control the light sources of the backlight module consistent with the two-field sequential operation scheme.

6. The display device according to claim 1 , wherein the control unit is further configured to control the backlight module and the FOVU's such that a luminance level associated with each field is substantially equal to that of the other.

7. The display device according to claim 1 , wherein the backlight module comprises red color light sources, blue color light sources, green color light sources, and cyan color light sources, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, and two white filters.

8. The display device according to claim 1 , wherein the backlight module comprises red color LEDs, blue color LEDs, green color LEDs, and cyan color LEDS, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, and four white filters.

9. The display device according to claim 1 , wherein the backlight module comprises red color LEDs, blue color LEDs, green color LEDs, and cyan color LEDS, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, a yellow color filter and a white filter.

10. The display device according to claim 1 , wherein the backlight module comprises red color LEDs, blue color LEDs, green color LEDs, and cyan color LEDS, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, and two white filters.

11. The display device according to claim 1 , wherein the backlight module comprises red color LEDs, blue color LEDs, green color LEDs, cyan color LEDS, and yellow color LEDs, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, a yellow color filter and a white filter.

12. The display device according to claim 1 , wherein the backlight module comprises red color LEDs, blue color LEDs, green color LEDs, cyan color LEDS, and yellow color LEDs, and wherein each of subpixel repeat groups (SPRG's) that populate the respective repeat group areas of the front panel includes a selectable set of filters including: a red color filter, a green color filter, a blue color filter, a cyan color filter, and two white filters.

13. A method of operating a display device that comprises: (i) a backlight module having an array of at least four non-white light emitting diodes (LEDs), (ii) an array of liquid crystal cells, and (iii) an array of filters each covering a respective one of the liquid crystal cells, the combination defining pixels of display device for displaying an image, wherein each pixel in the array may be produced by use of at least four non-white filters and at least one white filter, according to a specified two-field sequential operation scheme, each combination of filter and corresponding liquid crystal cell defining a respective Filtered Optical Valve Unit (FOVU), with plural ones of said FOVU's being respectively grouped into repeat group areas, each repeat group area defining one of the pixels and having a repeating same color pattern of said FOVU's, the method comprising:
receiving a video data signal as a sequence of frames, in a three non-white color format;
determining for each frame, the LEDs and liquid crystal cells associated with filters that are to operate in a first field, and the LEDs and liquid crystal cells associated with filters that are to operate in a second field, based on specified two-field sequential operation scheme; and
controlling the liquid crystal cells associated with filters in each one of the fields based on the sequential operation scheme such that for each repeat group area, most of the filters are operable in both fields, two of the filters are mutually exclusive over the two fields, and at least one filter is operable only in one o

Assignees

• Ben-Chorin Moshe
• Roth Shmuel
• Samsung Display Co Ltd

Inventors

• Ben-Chorin Moshe
• Roth Shmuel

Classifications

• G09G3/3413 Primary

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• G09G2300/0452

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• G09G2310/0235

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• G09G3/36

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• G02F1/1335

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