Source: http://www.google.com/patents/US7916939?dq=5,870,513
Timestamp: 2014-09-01 07:31:14
Document Index: 47654797

Matched Legal Cases: ['Application No. 60', 'Application No. 038228092', 'Application No. 01271603', 'Application No. 03741035', 'Application No. 04011262', 'art 1', 'Application No. 2004', 'Application No. 01271603', 'Application No. 03741035', 'Application No. 02733203', 'Application No. 03706857']

Patent US7916939 - High brightness wide gamut display - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA device to produce a color image, the device including a color filtering arrangement to produce at least four colors, each color produced by a filter on a color filtering mechanism having a relative segment size, wherein the relative segment sizes of at least two of the primary colors differ....http://www.google.com/patents/US7916939?utm_source=gb-gplus-sharePatent US7916939 - High brightness wide gamut displayAdvanced Patent SearchPublication numberUS7916939 B2Publication typeGrantApplication numberUS 12/627,889Publication dateMar 29, 2011Filing dateNov 30, 2009Priority dateJul 24, 2002Also published asCN1717715A, EP1540639A2, EP1540639A4, US7471822, US7627167, US20040246389, US20090135197, US20100134515, WO2004010407A2, WO2004010407A3Publication number12627889, 627889, US 7916939 B2, US 7916939B2, US-B2-7916939, US7916939 B2, US7916939B2InventorsShmuel Roth, Ilan Ben-David, Moshe Ben-ChorinOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (99), Non-Patent Citations (44), Classifications (14), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetHigh brightness wide gamut displayUS 7916939 B2Abstract A device to produce a color image, the device including a color filtering arrangement to produce at least four colors, each color produced by a filter on a color filtering mechanism having a relative segment size, wherein the relative segment sizes of at least two of the primary colors differ.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation application of U.S. patent application Ser. No. 12/272,850, filed Nov. 18, 2008, now U.S. Pat. No. 7,627,167 which is a continuation application of U.S. patent application Ser. No. 10/491,726, filed Apr. 5, 2004, now U.S. Pat. No. 7,471,822 which is a National Phase Application of PCT International Application No. PCT/IL2003/000610, entitled �HIGH BRIGHTNESS WIDE GAMUT DISPLAY�, International Filing Date Jul. 24, 2003, published on Jan. 29, 2004 as International Publication No. WO 2004/010407, which in turn claims priority from U.S. Provisional Patent Application No. 60/397,781, filed Jul. 24, 2002, all of which are incorporated herein by reference in their entirety.
FIELD OF THE INVENTION The invention relates generally to color display devices and methods of displaying color images and, more particularly, to high brightness and/or wide color gamut displays.
Unfortunately, the light sources commonly used in existing display devices, for example, the UHP� lamps available from Philips Lighting, a division of Royal Philips Electronics, Eindhoven, Netherlands, produce non-uniform light spectra wherein, typically, the intensity of the red wavelength range is significantly lower than the intensity of other spectral ranges. Thus, in existing RGB systems, typically, higher brightness may be achieved only by significantly reducing the color saturation of the red wavelength ranges. Further, in projection display systems for home theater applications, wherein highly saturated colors are typically required, filters with narrower spectral transmission ranges are typically used, causing an additional reduction in image brightness.
The quality of color image reproduction can be significantly improved by expanding the color gamut of the display system. This can be achieved by using more than three primary colors to reproduce the image. Display systems using more than three primary colors are described in International Application PCT/IL01/00527, entitled �Device, System and Method For Electronic True Color Display�, filed Jun. 7, 2001, and published Dec. 13, 2001 as WO 01/95544, assigned to the assignee of the present application, the entire disclosure of which is incorporated herein by reference.
A six-primary display using superimposed images produced by two projection display devices, wherein each projection display device uses three different primary colors, is described in Masahiro Yamaguchi, Taishi Teraji, Kenro Ohsawa, Toshio Uchiyama, Hideto Motomura Yuri Murakami, and Nagaaki Ohyama, �Color image reproduction based on the multispectral and multiprimary imaging: Experimental evaluation�, Device Independent Color, Color Hardcopy and Applications VII, Proc. SPIE, Vol. 4663, pp. 15-26 (2002). In the dual-projection display system described in this reference, the wavelength ranges selected for the six primary color filters are essentially uniformly distributed across the visible spectra of 400-700 nm, with no spectral overlap between the primaries. In this way, a wide gamut may be achieved; however, the combined brightness of the two projection devices is dramatically reduced. In fact, the combined brightness produced by this dual-projection device is lower than the brightness produced by a corresponding single RGB projection device. Dividing the visible spectrum into six (rather than three) ranges does not increase the over-all image brightness because the six primaries cover narrower sub-ranges of the same visible spectrum. An additional reduction of intensity is caused by inherent optical losses in the division of the spectrum into narrower ranges.
SUMMARY OF EMBODIMENTS OF THE INVENTION An embodiment of the present invention provides a multi-primary color display device, e.g., a color projection display device, which produces images having a wide color gamut at brightness levels significantly higher than those of prior art devices. Further, for a given light source, the brightness level produced by embodiments of the device of the present invention is at least equal, and in some cases higher, than the brightness level of a conventional RGB projection display device using the same light source.
According to some of these embodiments, an increase in illumination efficiency may be achieved by using partially overlapping primary color spectra, wherein at least two of the primary color spectra overlap significantly. A specifically designed color filtering arrangement, e.g. including sets of filters or other filtering elements, may be used to convert white light into the desired, significantly overlapping spectra. The significantly overlapping primary color spectra may allow a larger percentage of the white light generated by the light source to be utilized by the display device. For example, when the device of the invention is operated in �full illumination� mode, i.e., when all the primary colors are at their maximum levels, the wide color gamut device of the invention may produce a white light output at levels comparable to, or even higher than, those of produced by a corresponding RGB projection device having a much narrower color gamut.
The following description of exemplary embodiments of the invention is based on a projection display system using a high-pressure mercury lamp, e.g., the UHP� 100 Watt lamp, available from Philips Lighting, a division of Royal Philips Electronics, Eindhoven, Netherlands, or any other suitable white light source having a similar spectral range. FIG. 1A schematically illustrates the spectral output of the high-pressure mercury UHP� 100 Watt lamp. It will be appreciated that all other types of high-pressure mercury lamps, such as the VIP lamp available from Osram, Berlin, Germany, have similar spectra and similar designs, so the following examples apply to all such lamps.
The examples herein are described in the context of high-pressure mercury type lamps because such lamps are most commonly used in projection display devices. However, some aspects of the embodiments described herein, e.g., the use of significantly overlapping primary color spectral ranges, may be applied in designing color filtering arrangements for other devices using other types of light sources. For example, aspects of the invention may be applied to devices using Xenon (Xe) type light sources, as are known in the art, having a spectral output as illustrated schematically in FIG. 1B. It will be appreciated by persons skilled in the art that the output spectra of the Xe type lamp of FIG. 1B is much smoother, and thus less difficult to accommodate, for the purpose of designing partially-overlapping spectra in accordance with embodiments of the invention, than the relatively �peaky� output spectra of the mercury type lamp of FIG. 1A.
By appropriately selecting a desired set of partially overlapping primary colors, and by appropriately designing a color filtering arrangement to produce such primary colors, the method and device of the following exemplary embodiments of the invention may be implemented in conjunction with any color display system known in the art. In some embodiments of the invention, the display system may use more than three, partially overlapping primary colors. Display systems using more than three primary colors are described in International Application PCT/IL01/00527, entitled �Device, System and Method For Electronic True Color Display�, filed Jun. 7, 2001, published Dec. 13, 2001 as WO 01/95544, and in International Application PCT/IL01/01179, entitled �Spectrally Matched Print Proofer�, filed Dec. 18, 2001, published Jun. 27, 2002 as WO 02/50763, assigned to the assignee of the present application, the entire disclosure of both of which is incorporated herein by reference.
EXAMPLE 1 Six Primaries, Six-Panel Wide Gamut Display The following example illustrates selection of primary color wavelength ranges for a wide gamut display using six Spatial Light Modulator (SLM) panels, wherein each panel produces one primary color. This configuration may allow full coverage of the typical color gamut of a projection film, e.g., a motion picture positive film, enabling a projection display to produce virtually all the colors that can be produced by projection film, as described below. FIG. 2 schematically illustrates an optical configuration of a device in accordance with this embodiment of the invention. The exemplary configuration of FIG. 2 is particularly adapted for devices using reflective-LCD type SLM panels.
According to embodiments of the invention, light from an illumination unit 201, which may include any suitable white light source known in the art, as described above, may be imaged onto LCD panels 206, 207, 208, 209, 210 and 211, via a relay lens 202, a reflection-transmission element, e.g., a polarizing beam splitter (PBS) 203, and a color separation arrangement, e.g., �X� color-separator cubes 204 and 205. Each of LCD panels 206, 207, 208, 209, 210 and 211 may include an array of pixels, as is known in the art, which may be selectively activated to produce a reflective pattern corresponding to one of a plurality of primary color images. In the example described herein, each LCD panel may be separately activated by a control unit (not shown in the drawings) to produce a reflective pattern corresponding to one of six independent primary color images, in accordance with an input signal representing a six-primary-color image. Such an input signal may be generated using any of the methods described in the above-referenced International Patent Applications, e.g., by converting a three-primary-color image signal into a six-primary-color image signal. As described below, each reflective pattern may modulate a corresponding primary color light beam to produce a corresponding primary color image component.
PBS 203 may split the white light from unit 201 into a reflected �s�-polarized component and a transmitted �p�-polarized component, as is known in the art. The �s�-polarized component may be separated by �X� color separation cube 204 into light beams of three different wavelength ranges, which correspond to three of the six primaries used in this embodiment of the invention. The operation of �X�-cubes as multiple filtering elements for color separation is well known in the art and commercially available. An example of such commercially available component is the Optec� Standard Cubic Dichroic (X-Cube) Beam-splitter available from Richter Enterprises, Texas, United States.
It may be appreciated by those skilled in the art that any other suitable color filtering arrangement may be used, for example, to implement a desired number of primary colors. For example, the color filtering arrangement may include one �X� color separation cube and a dichroic mirror, as are known in the art, to separate the polarized components into five primary color light beams.
Each pixel of LCD panels 206, 207 and 208, when activated to an �on� state, may convert the �s�-polarized light into corresponding �p�-polarized light, as is known in the art, and may reflect the converted light back via �X� color separation cube 204. The three primary color light beams exiting �X�-cube 204, which beams are modulated in accordance with three, respective, primary color image components, may be transmitted through PBS 203 towards projection lens 212. Analogously, the transmitted �p�-polarized light may be separated by �X� color separation cube 205 into three different color light beams, corresponding to the remaining three primary colors. Each pixel of LCD panels 209, 210 and 211, when activated to an �on� state, may convert the �p�-polarized light into corresponding �s�-polarized light, as is known in the art, and may reflect the converted light back via �X� color separation cube 205. The three color light beams exiting �X�-cube 205, which beams are modulated in accordance with three, respective, primary color image components, may be deflected by PBS 203 towards projection lens 212. The projection lens may project all six modulated colored light beams, i.e., all six primary color image components, onto a viewing screen (not shown in the drawings).
It should be noted that the separate wavelength ranges produced by �X�-cube devices are inherently non-overlapping. Therefore, in the example described herein, there is no spectral overlap among the three primary color spectra produced by each �X�-cube, 204 or 205. Therefore, in this configuration, the desired partial overlap between primary color spectra, in accordance with embodiments of the invention, may be achieved by overlaps between the primary color spectra produced by �X�-cube 204 and the primary color spectra produced by �X�-cube 205. It will be appreciated by persons skilled in the art that essentially any desired overlapping can be achieved between primary color spectra produced by two �X�-cubes.
FIGS. 3A and 3B schematically illustrate primary color wavelength spectra for a six-primary color display using the configuration of FIG. 2. FIG. 3A shows the wavelength spectra of a set of three non-overlapping primary colors having spectral ranges of approximately 400-500 nm, approximately 500-550 nm, and approximately 575-750 nm, respectively, which may be produced by one color separation cube, e.g., �X�-cube 204 in FIG. 2. FIG. 3B shows the wavelength spectra of an additional set of three non-overlapping primary colors having spectral ranges of approximately 450-520 nm, approximately 520-620 nm, and approximately 620-750 nm, respectively, which may be produced by another color separation cube, e.g., �X�-cube 205 in FIG. 2. As shown in the drawings, there is significant overlap between the spectra of each of the primary colors in FIG. 3A and at least one of the primary colors in FIG. 3B, and vice versa. For example, the spectrum at the bottom of FIG. 3B partially overlaps, at different ranges, the two bottom spectra in FIG. 3A. It will be appreciated by persons skilled in the art that, despite the significant overlaps between primaries, the six spectral ranges illustrated in FIGS. 3A and 3B represent six distinct primary colors. According to embodiments of the invention, the specific color choices and partial overlap design of the primary color wavelength ranges shown in FIGS. 3A and 3B may result in a significantly wider color gamut and image brightness, compared to prior art color display devices, as described below.
EXAMPLE 2 Multiple Primaries, Single Panel, Sequential Display The following example illustrates implementation of the present invention in the context of a six-primary-color sequential display. In a sequential display system, the colors are typically produced by a sequential color switching mechanism, e.g. a color wheel 1304 as shown in FIG. 13 or a color drum, which transmits each color for a preset time period (window) within each field of the video stream. In such a system, the relative intensities of the primary colors may be adjusted by adjusting the relative sizes of a plurality of color filter segments 1306 (FIG. 13) on the color wheel. The single panel configuration, e.g., a panel 1302 (FIG. 13), may be implemented with either LCoS (Liquid Crystal on Silicon) or micro-mirror (DMD�) type panels, which are available, for example, from Texas Instruments, U.S.A., as is known in the art. In this example, the spectra of FIGS. 3A and 3B are produced by six filter segments, wherein each filter segments transmit one of the spectra of FIG. 3A or 3B. The operation of multi-primary sequential projection color displays is discussed in detail in the above-referenced International Applications.
In order to calculate the reproducible color gamut, the light source spectrum, e.g. as shown in FIG. 1A or FIG. 1B, may be multiplied by a transmission spectrum (not shown) of the optical engine used, e.g., the single panel DMD� type optical engine. Such multiplication may exclude the influence of the color generating elements, e.g., the color filters. The resulting spectrum may then be multiplied by the transmission spectra of the color filters to provide a set of primary reproducible spectra corresponding to the primary colors, respectively. As is known in the art, CIE 1931 x and y values of the color points corresponding to the primary reproducible spectra may be calculated to determine the reproducible color gamut. The relative segment sizes of the color filters may be selected according to the primary reproducible spectra, so as to provide a maximal over-all brightness, e.g., when all the primary colors are at their maximum levels, and to provide a desired relative intensity for each primary color.
EXAMPLE 3 Five Primaries, Single Panel, Sequential Display It should be noted that the use of six primary colors is advantageous because six primaries may provide more flexibility in color adjustment compared to systems using less than six primaries. However, according to some embodiments of the invention, there are certain advantages in using less than six primary colors. One such advantage is that more time can be allocated to each primary in a sequential projection system, thereby improving the temporal resolution (bit depth) of the displayed image. According to this embodiment of the invention, five primary colors may be used. For example, the five primaries may include a blue color having a wavelength spectral range from about 400 nm to between 460 nm and 540 nm, a cyan color having a spectral range from between 400 nm and 460 nm to between 500 nm and 560 nm, a green color having a spectral range from between 480 nm and 520 nm to between 540 nm and 580 nm, a yellow color having a spectral range from between 500 nm and 550 nm to 650 nm or more, and a red color having a spectral range from between 580 nm and 620 nm to 700 nm or more.
EXAMPLE 4 Four Primaries, Single Panel, Sequential Display In some embodiments of the invention, a four primaries display may also provide many advantages for the multi-primary color display. According to these embodiments, improved brightness may be achieved by the addition of a yellow primary color filter segment to the RGB segments. White balance may be achieved by adjusting the relative segment sizes, as described above. For example, the four primary colors may include a blue color having a wavelength spectral range from about 400 nm to between 460 nm and 540 nm, a green color having a spectral range from between 480 nm and 520 nm to between 540 nm and 580 nm, a yellow color having a spectral range from between 500 nm and 550 nm to 650 nm or more, and a red color having a spectral range from between 580 nm and 620 nm to 700 nm or more.
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SPIE, vol. 4663, pp. 15-26.43Yamaguchi et al., "Multiprimary Color Display Using Holographic Optical Element", SPIE, vol. 3293, 1998, pp. 70-77.44Yamaguchi, "Multiprimary Color Displays", Color Forum Japan 1999 Proceedings, Kogakuin University, Shinjuku, Tokyo, Nov. 10 & 11, 1999, pp. 73-79.Classifications U.S. Classification382/162, 382/167, 382/168International ClassificationG09G3/36, G06K9/00, G02F1/13, G09G, G02F1/1335, H04N9/31, G03B21/00Cooperative ClassificationH04N9/3197, H04N9/3105European ClassificationH04N9/31V, H04N9/31A1Legal EventsDateCodeEventDescriptionSep 23, 2012ASAssignmentOwner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OFEffective date: 20120904Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRONICS CO., LTD.;REEL/FRAME:029009/0001Jul 19, 2010ASAssignmentEffective date: 20100704Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENOA COLOR TECHNOLOGIES LTD.;REEL/FRAME:24706/291Owner name: SAMSUNG ELECTRONICS CO., LTD.,KOREA, DEMOCRATIC PEFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENOA COLOR TECHNOLOGIES LTD.;REEL/FRAME:024706/0291Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, DEMOCRATIC POwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFeb 1, 2010ASAssignmentOwner name: GENOA COLOR TECHNOLOGIES LTD.,ISRAELFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ROTH, SHMUEL;BEN-DAVID, ILAN;BEN-CHORIN, MOSHE;REEL/FRAME:23877/250Effective date: 20100127Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ROTH, SHMUEL;BEN-DAVID, ILAN;BEN-CHORIN, MOSHE;REEL/FRAME:023877/0250Owner name: GENOA COLOR TECHNOLOGIES LTD., ISRAELRotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google