Source: http://www.google.com/patents/US7705810?dq=5,583,822
Timestamp: 2015-07-07 17:03:42
Document Index: 492947951

Matched Legal Cases: ['art 12', 'art 12', 'art 12', 'art 13', 'art 14', 'Application No. 04252242']

Patent US7705810 - Four-color data processing system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn organic electro-luminescent display (OELD) device for processing multi-color gray-scale data, comprises a four-color converting part for converting primary RGB gray-scale data into compensated RGBW gray-scale data by adding white gray-scale data to the primary RGB gray-scale data, a data driving part...http://www.google.com/patents/US7705810?utm_source=gb-gplus-sharePatent US7705810 - Four-color data processing systemAdvanced Patent SearchPublication numberUS7705810 B2Publication typeGrantApplication numberUS 10/804,722Publication dateApr 27, 2010Filing dateMar 19, 2004Priority dateMay 7, 2003Fee statusPaidAlso published asCN1551707A, CN1551707B, EP1475771A2, EP1475771A3, EP1947632A2, EP1947632A3, US20040222999Publication number10804722, 804722, US 7705810 B2, US 7705810B2, US-B2-7705810, US7705810 B2, US7705810B2InventorsBeohm-Rock Choi, Ung-Gyu Min, Joon-hoo Choi, Jin-Koo JungOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (27), Non-Patent Citations (3), Referenced by (43), Classifications (20), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetFour-color data processing system
US 7705810 B2Abstract
An organic electro-luminescent display (OELD) device for processing multi-color gray-scale data, comprises a four-color converting part for converting primary RGB gray-scale data into compensated RGBW gray-scale data by adding white gray-scale data to the primary RGB gray-scale data, a data driving part for processing the compensated RGBW gray-scale data provided from the four-color converting part to generate four-color signals in an analog type, a scan driving part for generating scan signals in sequence, and an OELD panel for emitting light with a color in response to the four-color signals from the data driving part and the scan signals from the scan driving part. The four-color converting part includes a gamma converting part for converting the primary RGB gray-scale data, a white extracting part for extracting a white color component from the gamma-converted RGB data, a data determining part for generating four-color RGBW data by subtracting the white color component from the gamma-converted RGB data and adding the white gray-scale data to the gamma-converted RGB data, and a reverse-gamma converting part for reverse-gamma converting the four-color RGBW data.
The above discussed and other drawbacks and deficiencies of the prior art are overcome or alleviated by the 4-color data processing system of the present invention. In one embodiment, a 4-color data processing device comprises a gamma converting part for performing gamma conversion with respect to RGB gray-scale data to obtain gamma-converted RGB data, a white extracting part for extracting a white color component from the gamma-converted RGB data provided from the gamma converting part, a data determining part for receiving the gamma-converted RGB data from the gamma converting part and the white color component from the white extracting part and generating four-color RGBW data, and a reverse-gamma converting part for performing reverse-gamma conversion with respect to the four-color RGBW data provided from the data determining part to generate reverse-gamma converted RGBW data to be displayed.
The white extracting part may generate minimum gray-scale data of the respective gamma-converted RGB data as the white color component. Alternatively, the white extracting part may include a first comparison unit for determining which color data of the gamma-converted RGB data has a minimum value, and a second comparison unit for comparing the minimum value determined by the first comparison unit with a predetermined value. In this case, the white extracting part generates the minimum value of the gamma-converted RGB data as the white color component if the minimum value is smaller than the predetermined value, and generates the predetermined value as the white color component if the minimum value is equal to or larger than the predetermined value. The predetermined value may be defined by aGmax y, where “Gmax” denotes a maximum gray-scale level of the RGB gray-scale data, and “a” is a ratio of each color data of the gamma-converted RGB data to a gray-scale number of a corresponding color data of the RGB gray-scale data.
Detailed illustrative embodiments of the present invention are disclosed herein. However, specific structural and functional details disclosed herein are merely representative for purposes of describing exemplary embodiments of the present invention. The exemplary embodiments are described below with reference to the accompanying drawings in which the same numerals are used to indicate the same or equivalent parts.
Generally, once the luminance of a backlight and the type of a color filter are determined in a liquid crystal display (LCD) device, R•G•B colors of the LCD device each have luminance with a predetermined magnitude so that it is difficult or unable to increase the luminance. In contrast, in organic electro-luminescent display (OELD) devices, R•G•B colors each have luminance of which magnitude may be increased by controlling a data voltage for each of the R•G•B colors.
When primary RGB gray-scale data is converted into compensated RGBW gray-scale data, a scaling factor is determined, for example, to be “1” or more. In this embodiment, the scaling factor is “2” (This will be described in detail below).
In the OELD device of the present invention, white gray-scale data is extracted from primary RGB gray-scale data, and the primary RGB gray-scale data is subtracted by the white gray-scale data to obtain new RGB gray-scale data. From the new RGB data and the extracted white gray-scale data, compensated RGBW gray-scale data is obtained that is data of four (4) colors, red, green, blue and white. In case that the scaling factor is “1”, although there is no or little increase in the luminance by adding the white gray-scale data, optical efficiency of display is increased so as to reduce power consumption. The luminance may be increased by controlling data voltage.
Here, Ry, Gyand Byare normalized luminance data of R color, G color and B color, respectively, with respect to the maximum luminance of corresponding one of the colors. Also, “a” denotes (1/Gmax)y, and Ry, Gyand Byare gray-scale numbers corresponding to R color, G color and B color, respectively. Gmax denotes a maximum gray-scale level. For example, when the full gray-scale of RGB data is “64”, its Gmax is “63”.
The remapping part 12 receives the gamma-converted RGB data and performs multiplication and remapping with respect to each color data of the gamma-converted RGB data. For example, the remapping part 12 multiplies each color data Ry, Gy, Byof the gamma-converted RGB data by scaling factor “2” as shown below in Expression 2. The remapping part 12 then provides the remapped RGB data to the white extracting part 13 and the data determining part 14.
Here, “S” denotes a scaling factor, a ratio of the maximum luminance of white obtained from composition of RGB colors to the maximum luminance of white obtained from composition of RGBW colors. The scaling factor S is preferably “2” when a color filter is used.
R y *=R y ′−W y′
G y *=G y ′−W y′
B y *=B y ′−W y′
Wy*=Wy′ Expression 4
In the embodiment of FIG. 4, the gamma converted RGB gray-scale data is multiplied by scale factor “2” so as to extend the gray-scale twice, for extracting the white color component to generate the new RGBW gray-scale data. In this case, it may be necessary to extend the bit-size of the data driving IC. For example, although a 6-bit size data driving IC may be eligible for 64 gray-scale, a 7-bit size data driving IC should be used in case that the gray-scale is extended to 70 or 80 gray-scale. To avoid increase in the bit-size of the data driving IC, the color data may be processed without the multiplication of the scaling factor. A detailed description of such embodiment follows.
Each color data Ry, Gy, Byof the gamma-converted RGB data is normalized luminance data of corresponding color data R, G, B of the primary RGB data with respect to its maximum luminance. In the above Expression 6, “a” is equal to (1/Gmax)y, and “Gmax” is a maximum gray-scale level. For example, when a full gray-scale is “64”, Gmax is “63” and the gray-number is between “0” and “63”. Also, “Ry”, “Gy” and “By” are gray-scale numbers corresponding to R, G and B colors, respectively.
The insulating layer 110 may be omitted in case of employing the quartz substrate. The insulating layer 110 is made of material including, for example, silicon. The silicon insulating layer 110 may include oxygen, nitrogen or a mixture thereof. For example, the silicon insulating layer 110 may be a silicon oxide layer, a silicon nitride layer, or a silicon oxynitride layer (SiOxNy, here “x” and “y” are integers).
When one or more of the respective color data of the compensated RGBW gray-scale data has a higher color purity, the luminance may also be improved by setting the gray-scale as “1”. In this case, a white color component is extracted from the primary RGB data and the extracted white color component is added to the compensated RGBW gray-scale data.
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ClassificationH01L51/50, G09G3/20, H01L27/32, G09G3/32, G09G3/30, H05B33/12, G09G5/02Cooperative ClassificationG09G2300/0842, H01L27/3213, G09G2300/0452, G09G2340/06, H01L27/322, G09G2320/0276, G09G3/3233, G09G3/3225European ClassificationG09G3/32A8C, G09G3/32A8Legal EventsDateCodeEventDescriptionMar 19, 2004ASAssignmentOwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, BEOHM-ROCK;MIN, UNG-GYU;CHOI, JOON-HOO;AND OTHERS;REEL/FRAME:015122/0431Effective date: 20040312Owner name: SAMSUNG ELECTRONICS CO., LTD.,KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, BEOHM-ROCK;MIN, UNG-GYU;CHOI, JOON-HOO AND OTHERS;US-ASSIGNMENT DATABASE UPDATED:20100427;REEL/FRAME:15122/431Owner name: SAMSUNG ELECTRONICS CO., LTD.,KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, BEOHM-ROCK;MIN, UNG-GYU;CHOI, JOON-HOO AND OTHERS;US-ASSIGNMENT DATABASE UPDATED:20100427;REEL/FRAME:15122/431Effective date: 20040312Owner name: SAMSUNG ELECTRONICS CO., LTD.,KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, BEOHM-ROCK;MIN, UNG-GYU;CHOI, JOON-HOO;AND OTHERS;REEL/FRAME:015122/0431Effective date: 20040312Sep 14, 2012ASAssignmentOwner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRONICS CO., LTD.;REEL/FRAME:028984/0774Effective date: 20120904Oct 15, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services