WO2015180363A1 - Rgb信号到rgbw信号的图像转换方法及装置 - Google Patents

Rgb信号到rgbw信号的图像转换方法及装置 Download PDF

Info

Publication number
WO2015180363A1
WO2015180363A1 PCT/CN2014/088307 CN2014088307W WO2015180363A1 WO 2015180363 A1 WO2015180363 A1 WO 2015180363A1 CN 2014088307 W CN2014088307 W CN 2014088307W WO 2015180363 A1 WO2015180363 A1 WO 2015180363A1
Authority
WO
WIPO (PCT)
Prior art keywords
pixel
luminance
frame
output value
value
Prior art date
Application number
PCT/CN2014/088307
Other languages
English (en)
French (fr)
Inventor
张晨
杨飞
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/443,495 priority Critical patent/US9666115B2/en
Priority to EP14861108.0A priority patent/EP3154262B1/en
Publication of WO2015180363A1 publication Critical patent/WO2015180363A1/zh

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/67—Circuits for processing colour signals for matrixing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/048—Preventing or counteracting the effects of ageing using evaluation of the usage time
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to an image conversion method and apparatus for RGB signals to RGBW signals.
  • an image display device such as a liquid crystal display (LCD) and an organic light emitting diode (OLED)
  • a red (R) sub-pixel unit, a green (G) sub-pixel unit, and The blue (B) sub-pixel unit constitutes one pixel unit, and the color image is displayed by controlling the gray value of each sub-pixel unit to mix the color to be displayed.
  • the RGB three primary colors have low luminous efficiency
  • the product optimization of the display device based on the RGB three primary colors is restricted, and based on this, red (R) sub-pixel units, green (G) sub-pixel units, and blue (B) sub-pixel units appear.
  • a pixel unit composed of white (W) sub-pixel units to improve the luminous efficiency of the RGB display.
  • the signal transmission interface such as the video graphics array VGA interface and the digital video interface DVI transmits RGB signals. If the RGB signal is directly applied to the RGBW display, the image will be distorted. Therefore, it is necessary to convert the RGB signals that are connected to the RGBW display.
  • the service life of the four-seed pixel unit is not uniform, and the lifetime of the sub-pixel unit with the shortest life represents the lifetime of the entire display.
  • adding a white (W) sub-pixel unit can improve the service life of three sub-pixel units of red (R), green (G), and blue (B)
  • Due to the inconsistent service life of the four-seed pixel unit the lifetime of the entire display cannot be effectively improved.
  • the embodiments of the present disclosure provide an image conversion method and apparatus for RGB signals to RGBW signals, so as to effectively improve the service life of the entire display.
  • an RGB signal to RGBW comprises: converting the received RGB input signals of each pixel in each frame into corresponding RGB brightness input values respectively; inputting values according to RGB brightness of each pixel in each frame, and presetting each frame before each frame.
  • the cumulative ratio of the RGB luminance output value and the W luminance output value in the RGBW luminance output value of each pixel in time determines the replacement ratio of the W luminance output value of each pixel in each frame; according to the determined W luminance of each pixel in each frame
  • the replacement ratio of the output value and the RGB luminance input value determine the RGBW luminance output value of each pixel in each frame; the determined RGBW luminance output values of each pixel in each frame are respectively converted into corresponding RGBW output signals and output.
  • the RGBW luminance output value of each pixel in the frame may be adjusted according to the usage rate of each sub-pixel in each pixel in a period of time before each frame, thereby It is realized that the service life of each sub-pixel in each pixel is kept as close as possible, thereby improving the service life of the entire display.
  • the RGBW luminance output value of each pixel may specifically include: when determining that the accumulated specific gravity of the R luminance output value is greater than the first threshold, calculating an RGBW luminance output value of each pixel in each frame by using the following formula:
  • L R L r -K W' L r ;
  • L G L g -K W' L r ;
  • L B L b -K W' L r ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the RGBW luminance output value of each pixel may specifically include: when determining that the cumulative weight of the G luminance output value is greater than the first threshold, calculating an RGBW luminance output value of each pixel in each frame by using the following formula:
  • L G L g -K W' L g ;
  • L B L b -K W' L g ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the RGBW luminance output value of each pixel may specifically include: determining the B luminance output When the cumulative weight of the value is greater than the first threshold, the RGBW luminance output value of each pixel in each frame is calculated by the following formula:
  • L R L r -K W' L b ;
  • L G L g -K W' L b ;
  • L B L b -K W' L b ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the RGBW luminance output value of each pixel may specifically include: when determining that the accumulated specific gravity of the W luminance output value is greater than the second threshold, calculating an RGBW luminance output value of each pixel in each frame by using the following formula:
  • L G L g -K W' L x ;
  • L B L b -K W' L x ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • L x represents each frame The luminance input value of the second sub-pixel of each pixel
  • K W ' represents the replacement ratio of the W luminance output value of each pixel in each frame.
  • the first threshold may be 1/3-0.6, and the second threshold may be 0.4-0.6.
  • an image conversion apparatus for an RGB signal to an RGBW signal, comprising: a signal receiving unit for receiving an RGB input signal of each pixel in each frame; and a converting unit for receiving The RGB input signals of each pixel in each frame are respectively converted into corresponding RGB luminance input values; the substitution rate determining unit is configured to input values according to RGB luminance of each pixel in each frame, and each preset time before each frame a cumulative proportion of the RGB luminance output value and the W luminance output value of the RGBW luminance output value of the pixel, determining a replacement ratio of the W luminance output value of each pixel in each frame; and a luminance output value determining unit for determining each frame according to the determined The replacement ratio of the W luminance output value of each pixel and the RGB luminance input value determine the RGBW luminance output value of each pixel in each frame; the inverse conversion unit is configured to separately convert the determined RGBW luminance output values of each pixel in each frame A corresponding RGBW
  • the substitution rate determining unit may include: a first determining subunit, configured to determine an RGBW luminance output value of each pixel in a preset time before each frame a cumulative weight of the RGB luminance output value and the W luminance output value, and a first sub-pixel that determines a maximum cumulative weight of the RGB luminance output value; and a second determining sub-unit configured to determine an RGB luminance input of each pixel in each frame a second sub-pixel having a smallest value; the first processing sub-unit, configured to: when determining that the accumulated specific gravity of the first sub-pixel luminance output value is greater than the first threshold, and the first sub-pixel is the second sub-pixel a replacement ratio of the W luminance output value in the frame; the second processing subunit, configured to: when determining that the accumulated specific gravity of the first subpixel luminance output value is greater than the first threshold, and the first subpixel is different from the second subpixel, Maintaining a replacement ratio of the W luminance
  • the brightness output value determining unit may be specifically configured to: when determining that the accumulated specific gravity of the R brightness output value is greater than the first threshold, The formula calculates the RGBW luminance output value for each pixel in each frame:
  • L R L r -K W' L r ;
  • L G L g -K W' L r ;
  • L B L b -K W' L r ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit may be specifically configured to: when determining that the cumulative weight of the G brightness output value is greater than the first threshold, The formula calculates the RGBW luminance output value for each pixel in each frame:
  • L G L g -K W' L g ;
  • L B L b -K W' L g ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit may be specifically configured to: when determining that the accumulated weight ratio of the B brightness output value is greater than the first threshold, The formula calculates the RGBW luminance output value for each pixel in each frame:
  • L R L r -K W' L b ;
  • L G L g -K W' L b ;
  • L B L b -K W' L b ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit may be specifically configured to: when determining that the accumulated weight ratio of the W brightness output value is greater than the second threshold, The formula calculates the RGBW luminance output value for each pixel in each frame:
  • L G L g -K W' L x ;
  • L B L b -K W' L x ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • L x represents each frame The luminance input value of the second sub-pixel of each pixel
  • K W ' represents the replacement ratio of the W luminance output value of each pixel in each frame.
  • the first threshold may be 1/3-0.6, and the second threshold may be 0.4-0.6.
  • FIG. 1 is a flowchart of an image conversion method of an RGB signal to an RGBW signal according to an embodiment of the present disclosure
  • FIG. 2 is a flow chart showing a substitution rate of a W luminance output value of each pixel outputted in the image conversion method of FIG. 1;
  • FIG. 3 is a schematic structural diagram of an image conversion device of an RGB signal to an RGBW signal according to an embodiment of the present disclosure.
  • An image conversion method of an RGB signal to an RGBW signal specifically includes the following steps: S101: converting the received RGB input signals of each pixel in each frame into corresponding RGB Luminance input value; S102, according to the RGB luminance input value of each pixel in each frame, and the cumulative proportion of the RGB luminance output value and the W luminance output value of the RGBW luminance output value of each pixel within a preset time before each frame, determining each a replacement ratio of the W luminance output value of each pixel in the frame; S103, determining an RGBW luminance output value of each pixel in each frame according to the determined replacement ratio of the W luminance output value of each pixel in each frame and the RGB luminance input value; S104. Convert the RGBW luminance output values of each pixel in each frame determined to be corresponding RGBW output signals and output them.
  • the RGBW luminance output value of each pixel in the frame may be adjusted according to the usage rate of each sub-pixel in each pixel in a period of time before each frame, thereby
  • the utility model realizes that the service life of each sub-pixel in each pixel is substantially consistent, thereby improving the service life of the entire display.
  • the RGB input signal is exemplified by an 8-bit input signal, that is, data signals corresponding to three colors of R, G, and B can be represented by a gray value between 0 and 255.
  • Step S101 of the foregoing method provided by the embodiment of the present disclosure converts the received RGB input signals of each pixel in each frame into corresponding RGB luminance input values, and may be implemented by gamma conversion in a specific implementation, that is, The received RGB input signals of each pixel in each frame are respectively converted into corresponding RGB luminance input values by the following formula:
  • L r represents the red luminance input value of the RGB luminance input value of each pixel in each frame
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents each pixel in each frame
  • R i represents the red input signal value in the RGB input signal of each pixel in each frame
  • G i represents the green input signal value in the RGB input signal of each pixel in each frame
  • B i represents the blue input signal value in the RGB input signal of each pixel in each frame
  • L Rmax represents the red luminance maximum value
  • L Gmax represents the green luminance maximum value
  • L Bmax represents the blue luminance maximum value
  • ⁇ represents the gamma Conversion factor.
  • the gamma conversion factor ⁇ is usually set to 2.2, and of course, it can be set to other values according to actual needs, which is not limited herein.
  • step S102 of the foregoing method provided by the embodiment of the present disclosure the RGB luminance output value of each pixel is RGB luminance output value according to the RGB luminance input value of each pixel in each frame and the preset time before each frame. And the cumulative weight of the W luminance output value, the replacement rate of the W luminance output value of each pixel in each frame is determined.
  • step S102 can be implemented by the following steps.
  • S201 Determine an accumulated specific gravity of the RGB luminance output value and the W luminance output value of the RGBW luminance output value of each pixel in a preset time before each frame, and determine a first sub-pixel with the largest cumulative weight of the RGB luminance output value.
  • the preset time may be set according to actual needs and the processing capability of the display chip, that is, the preset time may be a display time of one frame or a display time of multiple frames; or may be one day or one month. Or one year, etc., there is no limit here.
  • the accumulated value of the W luminance output value Then, use the formula separately with Calculating RGBW luminance output of each pixel in the accumulated value of the proportion of the predetermined time t K W K X gravity and the accumulated luminance output values W output luminance value of RGB in each frame prior.
  • the sub-pixel corresponding to the maximum value among the cumulative weights K X of the three RGB luminance output values is determined as the first sub-pixel;
  • S202 Determine a second sub-pixel with a minimum RGB luminance input value of each pixel in each frame
  • the sub-pixel corresponding to the minimum of the three values may be determined as the second sub-pixel by comparing the magnitudes of the RGB luminance input values R i , G i , and B i of each pixel in each frame. For example, when R i is the smallest in the frame, R is determined as the second sub-pixel;
  • steps S201 and S202 are in no particular order and is not limited herein. After steps S201 and S202 are performed, step S203, step S207, and step S209 are performed, respectively.
  • step S203 it is determined whether the accumulated specific gravity of the first sub-pixel luminance output value is greater than the first threshold. If yes, step S204 is performed. That is, in this step S203, it is determined whether the luminance of the first sub-pixel having the largest cumulative weight of the luminance output value in one pixel before the current frame exceeds a threshold value.
  • the first threshold is generally controlled within a range of 1/3 to 0.6, which is not limited herein.
  • the first threshold has a typical value of 0.4.
  • step S204 it is determined whether the first sub-pixel and the second sub-pixel are the same. If yes, step S205 is performed. If no, step S206 is performed.
  • the replacement rate of the W luminance output value in the frame is increased. That is, the cumulative weight of the red luminance output value in one pixel is the largest and larger than the first threshold in the preset time before the current frame, and the luminance input value of the red sub-pixel in the pixel is the smallest in the frame, and the pixel is increased.
  • the replacement rate of the W luminance output value in this frame For example, the substitution rate of the pixel's W luminance output value for this frame can be increased to one. In this way, the luminance output of W is completely replaced by the luminance output of R, thereby adjusting the lifetime of each sub-pixel as a whole to make it substantially consistent, thereby improving the service life of the entire display.
  • the replacement rate of the W luminance output value in the frame is maintained.
  • the initial value of the replacement ratio of the W luminance output value of each pixel in each frame is generally set to 0.6, which is not limited herein.
  • the cumulative weight of the red luminance output value in one pixel is the largest and larger than the first threshold in a preset time before the current frame, but in the current frame, the luminance input value of the green sub-pixel in the pixel is the smallest, and the pixel is kept in the present
  • the replacement rate of the W luminance output value of the frame that is, the substitution rate of the W luminance output value of the pixel in the present frame can be kept constant at the initial value of 0.6.
  • step S207 it is determined whether the cumulative specific gravity of the W luminance output value is greater than the second threshold. If yes, step S208 is performed. That is, in this step, it is determined that white in one pixel is preset within the preset time before this frame. Whether the luminance of the sub-pixels exceeds a threshold.
  • the second threshold is generally controlled to be in the range of 0.4 to 0.6, which is not limited herein.
  • the second threshold is typically 0.5;
  • the replacement rate of the W luminance output value in the frame is reduced. That is, the cumulative weight of the white luminance output value in one pixel is the largest and larger than the second threshold in a preset time before the current frame, indicating that the usage rate of the white sub-pixel is relatively high in a period of time before the current frame, and the pixel is decreased.
  • the replacement ratio of the W luminance output value of this frame that is, the usage rate of the white subpixel is correspondingly reduced in this frame.
  • the replacement rate of the W luminance output value of the pixel in the frame can be reduced to 0.4, thereby adjusting the lifetime of each sub-pixel as a whole to make it substantially consistent, thereby improving the service life of the entire display.
  • step S209 it is determined whether any two or more of the following conditions are satisfied: the cumulative specific gravity of the R luminance output value is greater than the first threshold, the cumulative specific gravity of the G luminance output value is greater than the first threshold, and the cumulative weight of the B luminance output value The cumulative weight greater than the first threshold and the W luminance output value is greater than the second threshold. If yes, step S210 is performed. That is, in this step S209, it is determined that the luminance of the illumination of any two, three or four of the red, green, blue or white pixels in one pixel before the current frame exceeds the threshold.
  • the first threshold is generally controlled in the range of 1/3 to 0.6
  • the second threshold is controlled in the range of 0.4-0.6, which is not limited herein.
  • the first threshold has a typical value of 0.4 and the second threshold has a typical value of 0.5.
  • the replacement rate of the W luminance output value in the frame is maintained.
  • the initial value of the replacement ratio of the W luminance output value of each pixel in each frame may be set to 0.6, which is not limited herein.
  • the replacement ratio of the pixel's W luminance output value in the current frame is maintained, that is, the pixel
  • the replacement ratio of the W luminance output value in this frame can be kept constant at the initial value of 0.6.
  • step S201 to step S210 of determining the replacement rate of the W luminance output value of each pixel in each frame provided by the embodiment of the present disclosure, by adjusting the first threshold value in step S203 and the value of the second threshold value in step S207, It can be ensured that the accumulated specific gravity of the first sub-pixel luminance output value in step S203 is greater than the first threshold, and the cumulative weight ratio of the W luminance output value in step S207 is greater than the second threshold, which is a complementary condition, that is, only one alternative is satisfied, and it is impossible At the same time satisfied.
  • the first threshold and the second threshold are not properly selected, there may be a cumulative weight of the R luminance output value being greater than the first threshold, an accumulated weight of the G luminance output value being greater than the first threshold, and a cumulative weight of the B luminance output value being greater than the first threshold.
  • a threshold value, and a cumulative weight of the W luminance output value is greater than the second threshold to satisfy any two or two On the situation. Therefore, errors in program execution can be avoided by steps S209 and S210.
  • the RGBW luminance output value of each pixel in each frame is determined according to the determined replacement ratio of the W luminance output value of each pixel in each frame and the RGB luminance input value. In specific implementation, the following four cases are specifically included.
  • the RGBW luminance output value of each pixel in each frame is calculated by the following formula:
  • L R L r -K W' L r ;
  • L G L g -K W' L r ;
  • L B L b -K W' L r ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the cumulative weight K R of the red luminance output value of the RGBW luminance output value of one pixel in the preset time before determining the current frame is the largest, and the red luminance input value R i of the RGB luminance input value of the pixel in the current frame.
  • the substitution rate of the W luminance output value of the pixel in this frame is increased to 1.
  • the RGBW luminance output value of the pixel in this frame is:
  • L R 0;
  • L G L g - L r ;
  • L B L b - L r ;
  • L W L r ;
  • the cumulative weight K R of the red luminance output value of the RGBW luminance output value of one pixel in the preset time before determining the current frame is the largest, and the green luminance input value G i of the RGB luminance input value of the pixel in the current frame.
  • the blue luminance input value B i is the smallest, the replacement rate of the W luminance output value of the pixel in the current frame remains unchanged at the initial value of 0.6.
  • the RGBW luminance output value of each pixel in each frame is calculated by the following formula:
  • L G L g -K W' L g ;
  • L B L b -K W' L g ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the cumulative specific gravity K G of the green luminance output value of the RGBW luminance output value of one pixel in the preset time before determining the current frame is the largest, and the green luminance input value G i of the RGB luminance input value of the pixel in the current frame.
  • the substitution rate of the W luminance output value of the pixel in this frame is increased to 1.
  • the RGBW luminance output value of the pixel in this frame is:
  • L R L r - L g ;
  • L G 0;
  • L B L b - L g ;
  • L W L g ;
  • the cumulative weight K G of the green luminance output value of the RGBW luminance output value of one pixel in the preset time before determining the current frame is the largest, and the red luminance input value R i of the RGB luminance input value of the pixel in the current frame.
  • the blue luminance input value B i is the smallest, the replacement rate of the W luminance output value of the pixel in the current frame remains unchanged at the initial value of 0.6.
  • the RGBW luminance output value of each pixel in each frame is calculated by the following formula:
  • L R L r -K W' L b ;
  • L G L g -K W' L b ;
  • L B L b -K W' L b ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the cumulative specific gravity K B of the blue luminance output value of one pixel in the preset time before determining the frame is the largest, and the blue luminance input value of the RGB luminance input value of one pixel in the current frame.
  • the substitution rate of the W luminance output value of the pixel in this frame is increased to 1.
  • the RGBW luminance output value of the pixel in this frame is:
  • L R L r - L b ;
  • L G L g - L b ;
  • L B 0;
  • L W L b ;
  • the luminance output of W in the pixel completely replaces the luminance output of B in this frame, thereby adjusting the lifetime of each sub-pixel as a whole to make it substantially consistent, thereby improving the service life of the entire display. .
  • the cumulative weight K B of the blue luminance output value of the RGBW luminance output value of one pixel in the preset time before determining the current frame is the largest, and the red luminance input value R of the RGB luminance input value of the pixel in the current frame.
  • the replacement rate of the W luminance output value of the pixel in the current frame remains unchanged at the initial value of 0.6.
  • the RGBW luminance output value of each pixel in each frame is calculated by the following formula:
  • L G L g -K W' L x ;
  • L B L b -K W' L x ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • the input value, L g represents the green luminance input value of the RGB luminance input value of each pixel in each frame,
  • L b represents the red luminance input value of the RGB luminance input value of each pixel in each frame;
  • L x represents each frame The luminance input value of the second sub-pixel of the pixel;
  • K W ' represents the replacement rate of the W luminance output value of each pixel in each frame.
  • the RGBW luminance output value in the four cases can be calculated by using the above specific calculation formula, and the RGBW luminance output value in the four cases can also be calculated by other formulas, which is not limited herein.
  • step S104 of the above method provided by the embodiment of the present disclosure the determined RGBW luminance output values of each pixel in each frame are respectively converted into corresponding RGBW output signals and output.
  • it can be realized by inverse gamma conversion, that is, the luminance output value of RGBW can be converted into the corresponding RGBW output signal by the following formula:
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • R 0 represents the red output signal value in the RGBW output signal
  • G 0 represents the RGBW
  • B 0 represents the green output signal value in the RGBW output signal
  • W 0 represents the white output signal value in the RGBW output signal
  • L Rmax represents the red brightness maximum value
  • L Gmax represents the green brightness maximum value.
  • Value, L Bmax represents the maximum blue luminance, L Wmax represents the maximum luminance of white;
  • ⁇ represents the gamma conversion factor.
  • the gamma conversion factor ⁇ is usually set to 2.2, and of course, it can be set to other values according to actual needs, which is not limited herein.
  • an embodiment of the present disclosure further provides an image conversion device of an RGB signal to an RGBW signal. Since the principle of solving the problem of the device is similar to the image conversion method of the foregoing RGB signal to RGBW signal, the implementation of the device can be referred to the implementation of the method. The repetitions are not repeated here.
  • the embodiment of the present disclosure further provides an image conversion device for an RGB signal to an RGBW signal.
  • the method includes: a signal receiving unit 301, configured to receive an RGB input signal of each pixel in each frame; and a conversion unit 302. Converting the received RGB input signals of each pixel in each frame into corresponding RGB luminance input values; the substitution rate determining unit 303 is configured to input values according to the RGB luminance of each pixel in each frame, and before each frame Setting the cumulative weight of the RGB luminance output value and the W luminance output value in the RGBW luminance output value of each pixel, determining the replacement ratio of the W luminance output value of each pixel in each frame; the luminance output value determining unit 304 is configured to determine The replacement ratio of the W luminance output value of each pixel in each frame and the RGB luminance input value are determined, and the RGBW luminance output value of each pixel in each frame is determined; the inverse conversion unit 305 is configured to determine each pixel in each frame.
  • the RGBW luminance output values are respectively converted
  • substitution rate determining unit 303 in the foregoing apparatus may specifically include a first determining subunit 3031, a second determining subunit 3032, a first processing subunit 3033, The second processing sub-unit 3034, the third processing sub-unit 3035, and the fourth processing sub-unit 3036.
  • the first determining sub-unit 3031 is configured to determine an accumulated specific gravity of the RGB luminance output value and the W luminance output value of the RGBW luminance output value of each pixel in a preset time before each frame, and determine a maximum cumulative weight of the RGB luminance output value.
  • the second determining sub-unit 3032 is configured to determine a second sub-pixel having the smallest RGB luminance input value of each pixel in each frame.
  • the first processing sub-unit 3033 is configured to increase a replacement ratio of the W luminance output value in the frame when determining that the accumulated specific gravity of the first sub-pixel luminance output value is greater than the first threshold, and the first sub-pixel is the second sub-pixel.
  • the second processing sub-unit 3034 is configured to maintain a replacement ratio of the W luminance output value in the frame when determining that the accumulated specific gravity of the first sub-pixel luminance output value is greater than the first threshold, and the first sub-pixel is different from the second sub-pixel.
  • the third processing sub-unit 3035 is configured to reduce the replacement rate of the W luminance output value in the frame when determining that the accumulated specific gravity of the W luminance output value is greater than the second threshold.
  • the fourth processing sub-unit 3036 is configured to determine that the accumulated specific gravity of the R luminance output value is greater than the first threshold, the cumulative specific gravity of the G luminance output value is greater than the first threshold, and the cumulative weight of the B luminance output value is greater than When the first threshold and the cumulative weight of the W luminance output value are greater than the second threshold satisfying any two or more, the replacement ratio of the W luminance output value in the frame is maintained.
  • the luminance output value determining unit 304 in the foregoing apparatus may be specifically configured to calculate each pixel in each frame by determining the cumulative weight ratio of the R luminance output value when the cumulative weight ratio is greater than the first threshold.
  • RGBW brightness output value RGBW brightness output value:
  • L R L r -K W' L r ;
  • L G L g -K W' L r ;
  • L B L b -K W' L r ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit 304 in the above apparatus may be specifically configured to calculate each pixel in each frame by determining the cumulative weight of the G brightness output value when the cumulative weight is greater than the first threshold.
  • RGBW brightness output value RGBW brightness output value:
  • L G L g -K W' L g ;
  • L B L b -K W' L g ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • the input value, L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame, and L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit 304 in the above apparatus may be specifically configured to calculate each pixel in each frame by determining the cumulative weight of the B brightness output value when the cumulative weight is greater than the first threshold.
  • RGBW brightness output value RGBW brightness output value:
  • L R L r -K W' L b ;
  • L G L g -K W' L b ;
  • L B L b -K W' L b ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • Input value
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • K W ' represents each frame The replacement rate of the W luminance output value of each pixel.
  • the brightness output value determining unit 304 in the foregoing apparatus may be specifically configured to calculate, when the cumulative weight ratio of the W brightness output value is greater than the second threshold, calculate each pixel in each frame by the following formula RGBW brightness output value:
  • L G L g -K W' L x ;
  • L B L b -K W' L x ;
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • L r represents the red luminance in the RGB luminance input value of each pixel in each frame
  • the input value, L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame, and L b represents the blue luminance input value in the RGB luminance input value of each pixel in each frame
  • L x represents each frame The luminance input value of the second sub-pixel of each pixel
  • K W ' represents the replacement ratio of the W luminance output value of each pixel in each frame.
  • the converting unit 302 in the foregoing apparatus may be specifically configured to convert the received RGB input signals of each pixel in each frame into corresponding RGB luminance input values by using the following formula:
  • L r represents the red luminance input value of the RGB luminance input value of each pixel in each frame
  • L g represents the green luminance input value in the RGB luminance input value of each pixel in each frame
  • L b represents each pixel in each frame
  • R i represents the red input signal value in the RGB input signal of each pixel in each frame
  • G i represents the green input signal value in the RGB input signal of each pixel in each frame
  • B i represents the blue input signal value in the RGB input signal of each pixel in each frame
  • L Rmax represents the red luminance maximum value
  • L Gmax represents the green luminance maximum value
  • L Bmax represents the blue luminance maximum value
  • ⁇ represents the gamma Conversion factor.
  • the gamma conversion factor ⁇ is usually set to 2.2, and of course, it can be set to other values according to actual needs, which is not limited herein.
  • the inverse conversion unit 305 in the foregoing apparatus may be specifically configured to separately convert the determined RGBW luminance output values of each pixel in each frame into corresponding RGBW output signals by using the following formula:
  • L R represents the red luminance output value in the RGBW luminance output value of each pixel in each frame
  • L G represents the green luminance output value in the RGBW luminance output value of each pixel in each frame
  • L B represents each pixel in each frame.
  • L W represents the white luminance output value in the RGBW luminance input value of each pixel in each frame
  • R 0 represents the red output signal value in the RGBW output signal
  • G 0 represents the RGBW
  • B 0 represents the green output signal value in the RGBW output signal
  • W 0 represents the white output signal value in the RGBW output signal
  • L Rmax represents the red brightness maximum value
  • L Gmax represents the green brightness maximum value.
  • Value, L Bmax represents the maximum blue luminance, L Wmax represents the maximum luminance of white;
  • ⁇ represents the gamma conversion factor.
  • the gamma conversion factor ⁇ is usually set to 2.2, and of course, it can be set to other values according to actual needs, which is not limited herein.
  • the first threshold is generally controlled in the range of 1/3 to 0.6
  • the second threshold is controlled in the range of 0.4 to 0.6, which is not limited herein.
  • the first threshold has a typical value of 0.4 and the second threshold has a typical value of 0.5.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.
  • An image conversion method and device for RGB signal to RGBW signal converts the received RGB input signals of each pixel in each frame into corresponding RGB luminance input values respectively; according to each pixel in each frame The RGB luminance input value, and the cumulative proportion of the RGB luminance output value and the W luminance output value of the RGBW luminance output value of each pixel within a preset time before each frame, determining the replacement ratio of the W luminance output value of each pixel in each frame; Determining an RGBW luminance output value of each pixel in each frame according to the determined replacement ratio of the W luminance output value of each pixel in each frame and the RGB luminance input value; respectively determining the RGBW luminance output values of each pixel in each frame determined respectively Converted to the corresponding RGBW output signal and output.
  • the RGBW luminance output value of each pixel in the frame can be adjusted according to the usage rate of each sub-pixel in each pixel in a period of time before each frame, thereby achieving the same as the service life of each sub-pixel in each pixel. , thereby increasing the life of the entire display.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

本发明本公开公开了一种RGB信号到RGBW信号的图像转换方法及装置，根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；这样，可以根据每帧之前一段时间内各像素中各亚子像素的使用率，来调整本帧中各像素的RGBW亮度输出值，从而实现尽量使各像素中的各亚子像素的使用寿命基本保持一致，进而提高整个显示器的使用寿命。

Description

RGB信号到RGBW信号的图像转换方法及装置 技术领域
本公开涉及显示技术领域，尤其涉及一种RGB信号到RGBW信号的图像转换方法及装置。
背景技术
目前，在诸如液晶显示器(Liquid Crystal Display,LCD)和有机电致发光显示器(Organic Light Emitting Diode,OLED)的图像显示设备中，利用红色(R)子像素单元、绿色(G)子像素单元以及蓝色(B)子像素单元组成一个像素单元，通过控制每个子像素单元的灰度值混合出所需显示的色彩来显示彩色图像。由于RGB三原色发光效率较低，会制约基于RGB三原色的显示设备的产品优化，基于此，出现了由红色(R)子像素单元、绿色(G)子像素单元、蓝色(B)子像素单元以及白色(W)子像素单元所组成的像素单元，以改善RGB显示器的发光效率。然而，由于诸如视频图形阵列VGA接口、数字视讯接口DVI的信号传输接口所传输的都是RGB信号。若将RGB信号直接应用于RGBW显示器，会导致图像失真。因此，需要对接入RGBW显示器的RGB信号进行转换。
由于在每帧显示中四种子像素单元的工作强度和工作时间不同，导致四种子像素单元的使用寿命并不一致，其中寿命最短的子像素单元的使用寿命代表整个显示器的使用寿命。在现有的RGB信号到RGBW信号的图像转换方法中，虽然增加白色(W)子像素单元可以提高红色(R)、绿色(G)和蓝色(B)三种子像素单元的使用寿命，但由于四种子像素单元的使用寿命不一致，导致不能有效地提高整个显示器的使用寿命。
因此，如何有效地提高整个显示器的使用寿命，是本领域技术人员亟需解决的技术问题。
发明内容
有鉴于此，本公开实施例提供了一种RGB信号到RGBW信号的图像转换方法及装置，用以有效地提高整个显示器的使用寿命。
因此，根据本公开实施例的第一方面，提供了一种RGB信号到RGBW 信号的图像转换方法，包括：将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号并输出。
利用本公开实施例提供的上述RGB信号到RGBW信号的图像转换方法，可以根据每帧之前一段时间内各像素中各子像素的使用率，来调整本帧中各像素的RGBW亮度输出值，从而实现尽量使各像素中的各子像素的使用寿命基本保持一致，进而提高整个显示器的使用寿命。
结合第一方面，在第一方面的一种实现方式中，所述根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率具体可包括：确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定所述RGB亮度输出值的累加比重最大的第一子像素；确定在每帧中各像素的RGB亮度输入值最小的第二子像素；在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素为第二子像素时，增大该帧中W亮度输出值的取代率；在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素与第二子像素不同时，保持该帧中W亮度输出值的取代率；在确定所述W亮度输出值的累加比重大于第二阈值时，减小该帧中W亮度输出值的取代率；在确定所述R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以上时，保持该帧中W亮度输出值的取代率。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，具体可包括：在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lr；
LG＝Lg-KW'Lr；
LB＝Lb-KW'Lr；
LW＝KW'Lr；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，具体可包括：在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lg；
LG＝Lg-KW'Lg；
LB＝Lb-KW'Lg；
LW＝KW'Lg；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，具体可包括：在确定B亮度输出 值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lb；
LG＝Lg-KW'Lb；
LB＝Lb-KW'Lb；
LW＝KW'Lb；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，具体可包括：在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lx；
LG＝Lg-KW'Lx；
LB＝Lb-KW'Lx；
LW＝KW'Lx；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Lx表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第一方面及其上述实现方式，在第一方面的另一实现方式中，所述第一阈值可以为1/3-0.6，所述第二阈值可以为0.4-0.6。
根据本公开实施例的第二方面，提供了一种RGB信号到RGBW信号的图像转换装置，包括：信号接收单元，用于接收每帧中各像素的RGB输入信号；转换单元，用于将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；取代率确定单元，用于根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；亮度输出值确定单元，用于根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；反转换单元，用于将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号；信号输出单元，用于输出每帧中各像素的RGBW输出信号。
结合第二方面，在第二方面的一种实现方式中，所述取代率确定单元可包括：第一确定子单元，用于确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定所述RGB亮度输出值的累加比重最大的第一子像素；第二确定子单元，用于确定在每帧中各像素的RGB亮度输入值最小的第二子像素；第一处理子单元，用于在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素为第二子像素时，增大该帧中W亮度输出值的取代率；第二处理子单元，用于在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素与第二子像素不同时，保持该帧中W亮度输出值的取代率；第三处理子单元，用于在确定所述W亮度输出值的累加比重大于第二阈值时，减小该帧中W亮度输出值的取代率；第四处理子单元，用于在确定所述R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以上时，保持该帧中W亮度输出值的取代率。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述亮度输出值确定单元可具体用于在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lr；
LG＝Lg-KW'Lr；
LB＝Lb-KW'Lr；
LW＝KW'Lr；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述亮度输出值确定单元可具体用于在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lg；
LG＝Lg-KW'Lg；
LB＝Lb-KW'Lg；
LW＝KW'Lg；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述亮度输出值确定单元可具体用于在确定B亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lb；
LG＝Lg-KW'Lb；
LB＝Lb-KW'Lb；
LW＝KW'Lb；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述亮度输出值确定单元可具体用于在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lx；
LG＝Lg-KW'Lx；
LB＝Lb-KW'Lx；
LW＝KW'Lx；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Lx表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
结合第二方面及其上述实现方式，在第二方面的另一实现方式中，所述第一阈值可以为1/3-0.6，所述第二阈值可以为0.4-0.6。
附图说明
图1为本公开实施例提供的RGB信号到RGBW信号的图像转换方法的流程图；
图2为图1的图像转换方法中的输出各像素的W亮度输出值的取代率的流程图；
图3为本公开实施例提供的RGB信号到RGBW信号的图像转换装置的结构示意图。
具体实施方式
下面结合附图，对本公开实施例提供的RGB信号到RGBW信号的图像转换方法及装置的具体实施方式进行详细地说明。
本公开实施例提供的一种RGB信号到RGBW信号的图像转换方法，如图1所示，具体包括以下步骤：S101、将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；S102、根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；S103、根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；S104、将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号并输出。
利用本公开实施例提供的上述RGB信号到RGBW信号的图像转换方法，可以根据每帧之前一段时间内各像素中各子像素的使用率，来调整本帧中各像素的RGBW亮度输出值，从而实现使各像素中的各子像素的使用寿命基本保持一致，进而提高整个显示器的使用寿命。
下面对实现本公开实施例提供的图像转换方法的各步骤的具体实现方式进行详细的说明。
在下述实施例中，RGB输入信号以8位的输入信号为例，即R、G、B三种颜色对应的数据信号可以通过介于0～255之间的灰度值来表示。
本公开实施例提供的上述方法的步骤S101将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值，在具体实施时，可以通过伽马转换的方式实现，即可以通过如下公式将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值：
Figure PCTCN2014088307-appb-000001
其中，Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Ri表示每帧中各像素的RGB输入信号中的红色输入信号值，Gi表示每帧中各像素的RGB输入信号中的绿色输入信号值，Bi表示每帧中各像素的RGB输入信号中的蓝色输入信号值；LRmax表示红色亮度最大值，LGmax表示绿色亮度最大值，LBmax表示蓝色亮度最大值；γ表示伽马转换因子。
在具体计算时，伽马转换因子γ通常设置为2.2，当然也可以根据实际需要设置为其他数值，在此不做限定。
具体地，在本公开实施例提供的上述方法的步骤S102中，根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率。如图2所示，可以通过如下步骤实现步骤S102。
S201：确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定RGB亮度输出值的累加比重最大的第一子像素。
具体地，可以根据实际需要和显示芯片的处理能力来设定预设时间，即该预设时间具体可以为一帧的显示时间，也可以为多帧的显示时间；还可以是一天、一个月或一年等，在此不做限定。
在具体实施时，首先，对每帧中各像素的RGB亮度输出值LX(其中，X＝R、G、或B)和W亮度输出值LW在每帧之前预设时间t内求和，得到每帧之前预设时间t内各像素的RGBW亮度输出值中RGB亮度输出值的累加值
Figure PCTCN2014088307-appb-000002
和W亮度输出值的累加值
Figure PCTCN2014088307-appb-000003
然后，分别利用公式
Figure PCTCN2014088307-appb-000004
和
Figure PCTCN2014088307-appb-000005
计算每帧之前预设时间t内各像素的RGBW亮度输出值中RGB亮度输出值的累加比重KX和W亮度输出值 的累加比重KW。最后，将与在三个RGB亮度输出值的累加比重KX中的最大值对应的子像素确定为第一子像素；
S202：确定在每帧中各像素的RGB亮度输入值最小的第二子像素；
具体地，可以通过比较每帧中各像素的RGB亮度输入值Ri、Gi和Bi的大小，将与这三个值中的最小值对应的子像素确定为第二子像素。例如，在本帧中Ri最小时，将R确定为第二子像素；
需要说明的是，上述步骤S201和步骤S202的执行顺序不分先后，在此不做限定。在执行完步骤S201和S202之后，分别执行步骤S203、步骤S207和步骤S209。
在S203中，确定第一子像素亮度输出值的累加比重是否大于第一阈值。若是，则执行步骤S204。即，在此步骤S203中确定在本帧之前预设时间内一像素中亮度输出值的累加比重最大的第一子像素的发光亮度是否超出一阈值。且在具体实施时，一般将第一阈值控制在1/3至0.6范围内，在此不做限定。较佳地，第一阈值的典型值为0.4。
在S204中，确定第一子像素和第二子像素是否相同。若是，则执行步骤S205。若否，则执行步骤S206。
在S205中，增大该帧中W亮度输出值的取代率。即，在本帧之前预设时间内一像素中红色亮度输出值的累加比重最大且大于第一阈值，并且，在本帧中该像素中红色子像素的亮度输入值最小，则增大该像素在本帧的W亮度输出值的取代率。例如，可以将该像素在本帧的W亮度输出值的取代率增大到1。这样，利用W的亮度输出完全取代R的亮度输出，从而从整体上调整各子像素的使用寿命使其基本保持一致，进而提高整个显示器的使用寿命。
在S206中，保持该帧中W亮度输出值的取代率。在具体实施时，一般将各帧中各像素的W亮度输出值的取代率的初始值设置为0.6，在此不做限定。例如，在本帧之前预设时间内一像素中红色亮度输出值的累加比重最大且大于第一阈值，但是在本帧中该像素中绿色子像素的亮度输入值最小，则保持该像素在本帧的W亮度输出值的取代率。即，该像素在本帧中的W亮度输出值的取代率可以保持初始值0.6不变。
在S207中，确定W亮度输出值的累加比重是否大于第二阈值。若是，则执行步骤S208。即在此步骤中确定在本帧之前预设时间内一像素中白色 子像素的发光亮度是否超出一阈值。在具体实施时，一般将第二阈值控制在0.4至0.6范围内，在此不做限定。较佳地，第二阈值的典型值为0.5；
在S208中，减小该帧中W亮度输出值的取代率。即，在本帧之前预设时间内一像素中白色亮度输出值的累加比重最大且大于第二阈值，说明在本帧之前一段时间内，白色子像素的使用率比较高，则减小该像素在本帧的W亮度输出值的取代率，即在本帧中对应减少白色子像素的使用率。例如，可以将该像素在本帧中的W亮度输出值的取代率减小到0.4，从而从整体上调整各子像素的使用寿命使其基本保持一致，进而提高整个显示器的使用寿命。
在S209中，确定是否满足以下条件中的任意两个或两个以上：R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值。若是，则执行步骤S210。即在此步骤S209中确定在本帧之前预设时间内一像素中红色、绿色、蓝色或白色中的任意两种、三种或四种子像素的发光亮度超出阈值。在具体实施时，一般将第一阈值控制在1/3至0.6范围内，将第二阈值控制在0.4-0.6范围内，在此不做限定。较佳地，第一阈值的典型值为0.4，第二阈值的典型值为0.5。
在S210中，保持该帧中W亮度输出值的取代率。在具体实施时，可以将各帧中各像素的W亮度输出值的取代率的初始值设置为0.6，在此不做限定。例如，在本帧之前预设时间内一像素中红色亮度输出值和绿色亮度输出值的累加比重均大于第一阈值，则保持该像素在本帧的W亮度输出值的取代率，即该像素在本帧中的W亮度输出值的取代率可以保持初始值0.6不变。
在本公开实施例提供的上述确定每帧中各像素的W亮度输出值的取代率的步骤S201-步骤S210中，通过调整步骤S203中的第一阈值和步骤S207中的第二阈值的数值，可以保证步骤S203中的第一子像素亮度输出值的累加比重大于第一阈值，和步骤S207中W亮度输出值的累加比重大于第二阈值，为互补条件，即只能择一满足，不可能同时满足。但是，若第一阈值和第二阈值的选取不当，有可能存在R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以 上的情况。因此，通过步骤S209和S210可以避免程序执行上的错误。
在本公开实施例提供的上述方法的步骤S103中，根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，在具体实施时，具体包括以下四种情况。
(1)在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lr；
LG＝Lg-KW'Lr；
LB＝Lb-KW'Lr；
LW＝KW'Lr；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中红色亮度输出值的累加比重KR最大、且在本帧中该像素的RGB亮度输入值中红色亮度输入值Ri最小时，将该像素在本帧中的W亮度输出值的取代率增大到1。此时，本帧中该像素的RGBW亮度输出值为：
LR＝0；LG＝Lg-Lr；LB＝Lb-Lr；LW＝Lr；
从上式可以看出，在本帧中该像素中的W的亮度输出完全取代R的亮度输出，从而从整体上调整各子像素的使用寿命使其基本保持一致，进而提高整个显示器的使用寿命。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中红色亮度输出值的累加比重KR最大，且在本帧中该像素的RGB亮度输入值中绿色亮度输入值Gi或蓝色亮度输入值Bi最小时，该像素在本帧中的W亮度输出值的取代率保持初始值0.6不变。
(2)在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lg；
LG＝Lg-KW'Lg；
LB＝Lb-KW'Lg；
LW＝KW'Lg；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中绿色亮度输出值的累加比重KG最大，且在本帧中该像素的RGB亮度输入值中绿色亮度输入值Gi最小时，将该像素在本帧中的W亮度输出值的取代率增大到1。此时，本帧中该像素的RGBW亮度输出值为：
LR＝Lr-Lg；LG＝0；LB＝Lb-Lg；LW＝Lg；
从上式可以看出，在本帧中该像素中的W的亮度输出完全取代G的亮度输出，从而从整体上调整各子像素的使用寿命使其基本保持一致，进而提高整个显示器的使用寿命。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中绿色亮度输出值的累加比重KG最大，且在本帧中该像素的RGB亮度输入值中红色亮度输入值Ri或蓝色亮度输入值Bi最小时，该像素在本帧中的W亮度输出值的取代率保持初始值0.6不变。
(3)在确定B亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lb；
LG＝Lg-KW'Lb；
LB＝Lb-KW'Lb；
LW＝KW'Lb；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG 表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中蓝色亮度输出值的累加比重KB最大，且在本帧中一像素的RGB亮度输入值中蓝色亮度输入值Bi最小时，将该像素在本帧中的W亮度输出值的取代率增大到1。此时，本帧中该像素的RGBW亮度输出值为：
LR＝Lr-Lb；LG＝Lg-Lb；LB＝0；LW＝Lb；
从上式可以看出，在本帧中该像素中的W的亮度输出完全取代B的亮度输出，从而从整体上调整各子像素的使用寿命使其基本保持一致，进而提高整个显示器的使用寿命。
具体地，在确定本帧之前预设时间内一像素的RGBW亮度输出值中蓝色亮度输出值的累加比重KB最大，且在本帧中该像素的RGB亮度输入值中红色亮度输入值Ri或绿色亮度输入值Gi最小时，该像素在本帧中的W亮度输出值的取代率保持初始值0.6不变。
(4)在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lx；
LG＝Lg-KW'Lx；
LB＝Lb-KW'Lx；
LW＝KW'Lx；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的红色亮 度输入值；Lx表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
在具体实施时，可以通过上述具体计算公式分别计算出在四种情况下的RGBW亮度输出值，也可以通过其他公式计算在四种情况下的RGBW亮度输出值，在此不做限定。
具体地，在本公开实施例提供的上述方法的步骤S104中，将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号并输出。在具体实施时，就可以通过反伽马转换的方式实现，即可以通过如下公式将RGBW的亮度输出值分别转换为对应的RGBW输出信号：
Figure PCTCN2014088307-appb-000006
Figure PCTCN2014088307-appb-000007
Figure PCTCN2014088307-appb-000008
Figure PCTCN2014088307-appb-000009
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；R0表示RGBW输出信号中的红色输出信号值，G0表示RGBW输出信号中的蓝色输出信号值，B0表示RGBW输出信号中的绿色输出信号值，W0表示RGBW输出信号中的白色输出信号值；LRmax表示红色亮度最大值，LGmax表示绿色亮度最大值，LBmax表示蓝色亮度最大值，LWmax表示白色亮度最大值；γ表示伽马转换因子。
一般在具体计算时，伽马转换因子γ通常设置为2.2，当然也可以根据实际需要设置为其他数值，在此不做限定。
基于同一发明构思，本公开实施例还提供了一种RGB信号到RGBW信号的图像转换装置。由于该装置解决问题的原理与前述一种RGB信号到RGBW信号的图像转换方法相似，因此该装置的实施可以参见方法的实施， 重复之处不再赘述。
本公开实施例还提供了一种RGB信号到RGBW信号的图像转换装置，如图3所示，包括：信号接收单元301，用于接收每帧中各像素的RGB输入信号；转换单元302，用于将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；取代率确定单元303，用于根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；亮度输出值确定单元304，用于根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；反转换单元305，用于将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号；信号输出单元306，用于输出每帧中各像素的RGBW输出信号。
进一步地，在本公开实施例提供的上述装置中的取代率确定单元303，如图3所示，具体可以包括第一确定子单元3031、第二确定子单元3032、第一处理子单元3033、第二处理子单元3034、第三处理子单元3035和第四处理子单元3036。
第一确定子单元3031用于确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定RGB亮度输出值的累加比重最大的第一子像素。
第二确定子单元3032用于确定在每帧中各像素的RGB亮度输入值最小的第二子像素。
第一处理子单元3033用于在确定第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素为第二子像素时，增大该帧中W亮度输出值的取代率。
第二处理子单元3034用于在确定第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素与第二子像素不同时，保持该帧中W亮度输出值的取代率。
第三处理子单元3035用于在确定W亮度输出值的累加比重大于第二阈值时，减小该帧中W亮度输出值的取代率。
第四处理子单元3036用于在确定R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于 第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以上时，保持该帧中W亮度输出值的取代率。
进一步地，在本公开实施例提供的上述装置中的亮度输出值确定单元304，具体可以用于在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lr；
LG＝Lg-KW'Lr；
LB＝Lb-KW'Lr；
LW＝KW'Lr；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
进一步地，在本公开实施例提供的上述装置中的亮度输出值确定单元304，具体可以用于在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lg；
LG＝Lg-KW'Lg；
LB＝Lb-KW'Lg；
LW＝KW'Lg；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值 中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
进一步地，在本公开实施例提供的上述装置中的亮度输出值确定单元304，具体可以用于在确定B亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lb；
LG＝Lg-KW'Lb；
LB＝Lb-KW'Lb；
LW＝KW'Lb；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
进一步地，在本公开实施例提供的上述装置中的亮度输出值确定单元304具体可以用于在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
LR＝Lr-KW'Lx；
LG＝Lg-KW’Lx；
LB＝Lb-KW'Lx；
LW＝KW'Lx；
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值 中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Lx表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
进一步地，本公开实施例提供的上述装置中的转换单元302具体可以用于通过下述公式将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值：
Figure PCTCN2014088307-appb-000010
其中，Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Ri表示每帧中各像素的RGB输入信号中的红色输入信号值，Gi表示每帧中各像素的RGB输入信号中的绿色输入信号值，Bi表示每帧中各像素的RGB输入信号中的蓝色输入信号值；LRmax表示红色亮度最大值，LGmax表示绿色亮度最大值，LBmax表示蓝色亮度最大值；γ表示伽马转换因子。
一般在具体计算时，伽马转换因子γ通常设置为2.2，当然也可以根据实际需要设置为其他数值，在此不做限定。
进一步地，本公开实施例提供的上述装置中的反转换单元305具体可以用于通过下述公式将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号：
Figure PCTCN2014088307-appb-000011
Figure PCTCN2014088307-appb-000012
Figure PCTCN2014088307-appb-000013
Figure PCTCN2014088307-appb-000014
其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧 中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；R0表示RGBW输出信号中的红色输出信号值，G0表示RGBW输出信号中的蓝色输出信号值，B0表示RGBW输出信号中的绿色输出信号值，W0表示RGBW输出信号中的白色输出信号值；LRmax表示红色亮度最大值，LGmax表示绿色亮度最大值，LBmax表示蓝色亮度最大值，LWmax表示白色亮度最大值；γ表示伽马转换因子。
一般在具体计算时，伽马转换因子γ通常设置为2.2，当然也可以根据实际需要设置为其他数值，在此不做限定。
在具体实施时，一般将第一阈值控制在1/3至0.6范围内，将第二阈值控制在0.4至0.6范围内，在此不做限定。较佳地，第一阈值的典型值为0.4，第二阈值的典型值为0.5。
本领域技术人员可以理解附图只是一个优选实施例的示意图，附图中的模块或流程并不一定是实施本公开所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实施例描述进行分布于实施例的装置中，也可以进行相应变化位于不同于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个模块，也可以进一步拆分成多个子模块。
上述本公开实施例序号仅仅为了描述，不代表实施例的优劣。
本公开实施例提供的一种RGB信号到RGBW信号的图像转换方法及装置，将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；根据每帧中各像素的RGB亮度输入值，以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号并输出。这样，可以根据每帧之前一段时间内各像素中各子像素的使用率，来调整本帧中各像素的RGBW亮度输出值，从而实现尽量使各像素中的各子像素的使用寿命基本保持一致，进而提高整个显示器的使用寿命。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要 求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
本申请要求于2014年5月30日递交的中国专利申请第201410241038.8号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (14)

  1. 一种RGB信号到RGBW信号的图像转换方法，包括：
    将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；
    根据每帧中各像素的RGB亮度输入值、以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；
    根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；
    将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号并输出。
  2. 如权利要求1所述的方法，其中，所述根据每帧中各像素的RGB亮度输入值、以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率包括：
    确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定所述RGB亮度输出值的累加比重最大的第一子像素；
    确定在每帧中各像素的RGB亮度输入值最小的第二子像素；
    在确定所述第一子像素亮度输出值的累加比重大于第一阈值、且第一子像素为第二子像素时，增大该帧中W亮度输出值的取代率；
    在确定所述第一子像素亮度输出值的累加比重大于第一阈值、且第一子像素与第二子像素不同时，保持该帧中W亮度输出值的取代率；
    在确定所述W亮度输出值的累加比重大于第二阈值时，减小该帧中W亮度输出值的取代率；
    在确定所述R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以上时，保持该帧中W亮度输出值的取代率。
  3. 如权利要求2所述的方法，其中，所述根据确定出的每帧中各像素的 W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值，具体包括：
    在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lr；
    LG＝Lg-KW'Lr；
    LB＝Lb-KW'Lr；
    LW＝KW'Lr；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  4. 如权利要求2所述的方法，其中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值包括：
    在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lg；
    LG＝Lg-KW'Lg；
    LB＝Lb-KW'Lg；
    LW＝KW'Lg；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’ 表示每帧中各像素的W亮度输出值的取代率。
  5. 如权利要求2所述的方法，其中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值包括：
    在确定B亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lb；
    LG＝Lg-KW'Lb；
    LB＝Lb-KW'Lb；
    LW＝KW'Lb；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  6. 如权利要求2所述的方法，其中，所述根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值包括：
    在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lx；
    LG＝Lg-KW'Lx；
    LB＝Lb-KW'Lx；
    LW＝KW'Lx；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入 值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Lx表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  7. 如权利要求2-6任一项所述的方法，其中，所述第一阈值为1/3至0.6，所述第二阈值为0.4至0.6。
  8. 一种RGB信号到RGBW信号的图像转换装置，其中，包括：
    信号接收单元，用于接收每帧中各像素的RGB输入信号；
    转换单元，用于将接收到的每帧中各像素的RGB输入信号分别转换为对应的RGB亮度输入值；
    取代率确定单元，用于根据每帧中各像素的RGB亮度输入值、以及在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，确定每帧中各像素的W亮度输出值的取代率；
    亮度输出值确定单元，用于根据确定出的每帧中各像素的W亮度输出值的取代率和RGB亮度输入值，确定每帧中各像素的RGBW亮度输出值；
    反转换单元，用于将确定出的每帧中各像素的RGBW亮度输出值分别转换为对应的RGBW输出信号；
    信号输出单元，用于输出每帧中各像素的RGBW输出信号。
  9. 如权利要求8所述的图像转换装置，其中，所述取代率确定单元包括：
    第一确定子单元，用于确定在每帧之前预设时间内各像素的RGBW亮度输出值中RGB亮度输出值和W亮度输出值的累加比重，以及确定所述RGB亮度输出值的累加比重最大的第一子像素；
    第二确定子单元，用于确定在每帧中各像素的RGB亮度输入值最小的第二子像素；
    第一处理子单元，用于在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素为第二子像素时，增大该帧中W亮度输出值的取代率；
    第二处理子单元，用于在确定所述第一子像素亮度输出值的累加比重大于第一阈值，且第一子像素与第二子像素不同时，保持该帧中W亮度输出值的取代率；
    第三处理子单元，用于在确定所述W亮度输出值的累加比重大于第二阈 值时，减小该帧中W亮度输出值的取代率；
    第四处理子单元，用于在确定所述R亮度输出值的累加比重大于第一阈值、G亮度输出值的累加比重大于第一阈值、B亮度输出值的累加比重大于第一阈值、以及W亮度输出值的累加比重大于第二阈值满足任意两个或两个以上时，保持该帧中W亮度输出值的取代率。
  10. 如权利要求9所述的图像转换装置，其中，所述亮度输出值确定单元用于在确定R亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lr；
    LG＝Lg-KW'Lr；
    LB＝Lb-KW'Lr；
    LW＝KW'Lr；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  11. 如权利要求9所述的图像转换装置，其中，所述亮度输出值确定单元用于在确定G亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lg；
    LG＝Lg-KW'Lg；
    LB＝Lb-KW'Lg；
    LW＝KW'Lg；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入 值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  12. 如权利要求9所述的图像转换装置，其中，所述亮度输出值确定单元用于在确定B亮度输出值的累加比重大于第一阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lb；
    LG＝Lg-KW'Lb；
    LB＝Lb-KW'Lb；
    LW＝KW'Lb；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  13. 如权利要求9所述的图像转换装置，其中，所述亮度输出值确定单元用于在确定W亮度输出值的累加比重大于第二阈值时，通过下述公式计算每帧中各像素的RGBW亮度输出值：
    LR＝Lr-KW'Lx；
    LG＝Lg-KW'Lx；
    LB＝Lb-KW'Lx；
    LW＝KW'Lx；
    其中，LR表示每帧中各像素的RGBW亮度输出值中的红色亮度输出值，LG表示每帧中各像素的RGBW亮度输出值中的绿色亮度输出值，LB表示每帧中各像素的RGBW亮度输入值中的蓝色亮度输出值，LW表示每帧中各像素的RGBW亮度输入值中的白色亮度输出值；Lr表示每帧中各像素的RGB亮度输入值中的红色亮度输入值，Lg表示每帧中各像素的RGB亮度输入值中的绿色亮度输入值，Lb表示每帧中各像素的RGB亮度输入值中的蓝色亮度输入值；Lx 表示每帧中各像素的第二子像素的亮度输入值；KW’表示每帧中各像素的W亮度输出值的取代率。
  14. 如权利要求9-13任一项所述的图像转换装置，其中，所述第一阈值为1/3至0.6，所述第二阈值为0.4至0.6。
PCT/CN2014/088307 2014-05-30 2014-10-10 Rgb信号到rgbw信号的图像转换方法及装置 WO2015180363A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/443,495 US9666115B2 (en) 2014-05-30 2014-10-10 Image conversion method and apparatus for converting RGB signal to RGBW signal
EP14861108.0A EP3154262B1 (en) 2014-05-30 2014-10-10 Method and device for converting image from rgb signal into rgbw signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410241038.8A CN104023219B (zh) 2014-05-30 2014-05-30 一种rgb信号到rgbw信号的图像转换方法及装置
CN201410241038.8 2014-05-30

Publications (1)

Publication Number Publication Date
WO2015180363A1 true WO2015180363A1 (zh) 2015-12-03

Family

ID=51439761

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/088307 WO2015180363A1 (zh) 2014-05-30 2014-10-10 Rgb信号到rgbw信号的图像转换方法及装置

Country Status (4)

Country Link
US (1) US9666115B2 (zh)
EP (1) EP3154262B1 (zh)
CN (1) CN104023219B (zh)
WO (1) WO2015180363A1 (zh)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104023219B (zh) 2014-05-30 2015-09-09 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置
CN104091578B (zh) * 2014-06-25 2016-03-02 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置
CN104505052B (zh) * 2014-09-18 2017-01-25 深圳市华星光电技术有限公司 图像数据处理方法及装置
CN104505053B (zh) * 2015-01-04 2017-03-15 京东方科技集团股份有限公司 显示信号转换方法和装置
CN104639925A (zh) * 2015-03-16 2015-05-20 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置
CN104732925B (zh) * 2015-03-31 2017-11-10 青岛海信电器股份有限公司 一种rgb信号的处理方法及装置
US10593248B2 (en) 2017-02-07 2020-03-17 Samsung Display Co., Ltd. Method and apparatus for a sink device to receive and process sub-sampled pixel data
KR102536347B1 (ko) * 2017-12-20 2023-05-24 엘지디스플레이 주식회사 표시장치 및 이의 구동방법
CN108711396B (zh) * 2018-05-30 2020-03-31 京东方科技集团股份有限公司 像素数据的处理方法及处理装置、显示装置及显示方法
WO2020012516A1 (en) * 2018-07-10 2020-01-16 Macropix S.R.L. Colour management in an led screen with rgbw pixels to minimize consumption.
KR20220058157A (ko) * 2020-10-30 2022-05-09 엘지디스플레이 주식회사 사색 부화소를 포함하는 표시장치 및 그 구동방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101510389A (zh) * 2008-02-15 2009-08-19 株式会社日立显示器 显示装置
KR20130030598A (ko) * 2011-09-19 2013-03-27 엘지디스플레이 주식회사 ＲＧＢ-ｔｏ-ＲＧＢＷ 변환방법과 이를 이용한 표시장치
CN103218988A (zh) * 2013-03-25 2013-07-24 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置
CN104023219A (zh) * 2014-05-30 2014-09-03 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080158115A1 (en) * 2005-04-04 2008-07-03 Koninklijke Philips Electronics, N.V. Led Display System
US7510454B2 (en) * 2006-01-19 2009-03-31 Eastman Kodak Company OLED device with improved power consumption
KR102090705B1 (ko) * 2012-09-07 2020-03-19 삼성디스플레이 주식회사 표시 장치 및 표시 장치의 구동 방법
KR101384993B1 (ko) * 2012-09-27 2014-04-14 삼성디스플레이 주식회사 유기 발광 표시 장치의 구동 방법 및 유기 발광 표시 장치
JP2014186257A (ja) * 2013-03-25 2014-10-02 Sony Corp 表示装置および電子機器
US9728124B2 (en) * 2013-05-08 2017-08-08 Apple Inc. Adaptive RGB-to-RGBW conversion for RGBW display systems
CN103680413B (zh) * 2013-12-31 2015-07-01 京东方科技集团股份有限公司 一种图像处理装置及方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101510389A (zh) * 2008-02-15 2009-08-19 株式会社日立显示器 显示装置
KR20130030598A (ko) * 2011-09-19 2013-03-27 엘지디스플레이 주식회사 ＲＧＢ-ｔｏ-ＲＧＢＷ 변환방법과 이를 이용한 표시장치
CN103218988A (zh) * 2013-03-25 2013-07-24 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置
CN104023219A (zh) * 2014-05-30 2014-09-03 京东方科技集团股份有限公司 一种rgb信号到rgbw信号的图像转换方法及装置

Also Published As

Publication number Publication date
EP3154262A4 (en) 2017-11-22
US9666115B2 (en) 2017-05-30
EP3154262A1 (en) 2017-04-12
EP3154262B1 (en) 2022-03-30
CN104023219A (zh) 2014-09-03
US20160267828A1 (en) 2016-09-15
CN104023219B (zh) 2015-09-09

Similar Documents

Publication Publication Date Title
WO2015180363A1 (zh) Rgb信号到rgbw信号的图像转换方法及装置
US10373551B2 (en) Display unit, image processing unit, and display method for improving image quality
JP5995456B2 (ja) 表示装置および表示装置駆動方法
US10008148B2 (en) Image processing apparatus, image processing method, display device, computer program and computer-readable medium
US8599211B2 (en) RGBW display system and method for displaying images thereof
WO2015196608A1 (zh) 一种rgb信号到rgbw信号的图像转换方法及装置
WO2016062248A1 (zh) Woled显示装置的图像显示控制方法及装置、显示装置
WO2012008342A1 (ja) 表示装置、表示装置の制御方法、プログラム及び記録媒体
JP5897159B2 (ja) 表示装置及びその制御方法
KR101319321B1 (ko) 액정 표시장치의 구동장치와 그 구동방법
WO2014153833A1 (zh) Rgb信号到rgbw信号的图像转换方法及装置
JP2011064959A (ja) 表示装置
TW201415449A (zh) 影像顯示單元及其驅動方法，信號產生器，信號產生程式，以及信號產生方法
US20140125689A1 (en) Display device, electronic apparatus, and drive method for display device
US20150049129A1 (en) Control circuit and a display thereof
WO2016002075A1 (ja) 画像表示装置及び光源調光方法
TWI460712B (zh) 顯示器之色域補償方法
CN108962155A (zh) 亮度调整方法以及显示器
JP2015109639A5 (zh)
JP2012226178A (ja) 表示制御装置、表示システム、画像データ出力方法、プログラム、及び記録媒体
KR20170039783A (ko) 표시 장치의 구동 방법
TWI475555B (zh) 顯示系統與顯示單元控制方法
KR101870991B1 (ko) 표시 장치의 색 보정장치 및 방법
WO2012137753A1 (ja) 表示装置および表示装置の制御方法
KR102533411B1 (ko) 영상 처리부, 그것을 포함하는 표시 장치, 및 영상 처리 방법

Legal Events

Date Code Title Description
REEP Request for entry into the european phase

Ref document number: 2014861108

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 14443495

Country of ref document: US

Ref document number: 2014861108

Country of ref document: EP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14861108

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE