WO2018205616A1 - 显示设备的亮度调整方法和调整装置 - Google Patents

显示设备的亮度调整方法和调整装置 Download PDF

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Publication number
WO2018205616A1
WO2018205616A1 PCT/CN2017/116574 CN2017116574W WO2018205616A1 WO 2018205616 A1 WO2018205616 A1 WO 2018205616A1 CN 2017116574 W CN2017116574 W CN 2017116574W WO 2018205616 A1 WO2018205616 A1 WO 2018205616A1
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value
display device
initial
gray
target
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PCT/CN2017/116574
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English (en)
French (fr)
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殷新社
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京东方科技集团股份有限公司
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Priority to US16/072,872 priority Critical patent/US11244640B2/en
Publication of WO2018205616A1 publication Critical patent/WO2018205616A1/zh

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    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a gray scale brightness adjustment method and an adjustment apparatus of a display device.
  • the gray standard display function (GSDF) is defined in the digital imaging and communication (DICOM) standard for medical fields, and it is usually required to perform gray scale luminance of medical display devices. Adjust to match the GSDF curve.
  • the present disclosure proposes a brightness adjustment side of a display device.
  • Method and adjustment device
  • a brightness adjustment method of a display device includes the steps of: determining a gray level interval on a target gray level curve based on a maximum brightness value and a minimum brightness value to be set; determining, on the target gray level curve, according to the gray level interval a target brightness value of each gray level of the display device; and adjusting a brightness of the gray level of the display device based on the determined target brightness value.
  • the maximum brightness value and the minimum brightness value to be set are the maximum brightness value and the minimum brightness value of the gray level of the display device.
  • the maximum brightness value and the minimum brightness value to be set are a maximum brightness value and a minimum brightness value set according to a pre-specified standard.
  • the standard is the gray scale standard display function "GSDF" specified in the “DICOM” standard for digital imaging and communication in the medical field.
  • the method further comprises: causing the display device to display grayscale images of the respective grayscales; acquiring initial luminance values of the respective grayscales; and determining the maximum luminance value and the minimum luminance value according to the initial luminance values.
  • the determining the target brightness value of each gray scale comprises: dividing the gray level interval according to the gray scale number of the display device; and The luminance values corresponding to the aliquots are respectively determined as target luminance values of respective gray levels of the display device.
  • adjusting the brightness of the gray level of the display device comprises: increasing an initial brightness value of the gray level to be adjusted under the condition that the target brightness value of the gray level to be adjusted is higher than the initial brightness value thereof; The initial brightness value of the gray level to be adjusted is reduced under the condition that the target brightness value of the gray scale to be adjusted is lower than the initial brightness value.
  • the initial luminance value of the grayscale is increased or decreased by increasing or decreasing the initial color component value of a grayscale.
  • the initial color component values are read from the display device.
  • an initial luminance value closest to the target luminance value of the grayscale to be adjusted is selected; and the gray corresponding to the selected initial luminance value is selected.
  • the initial color component value of the order is used as the initial color component value of the gray scale to be adjusted.
  • the method further includes: determining, after the adjusted gray scales, the adjusted Whether the initial luminance value satisfies a predetermined condition, and if the adjusted initial luminance value does not satisfy the predetermined condition, the adjustment step is performed again until all the adjusted initial luminance values satisfy the predetermined condition.
  • the predetermined condition is:
  • L adjust (j) is the adjusted initial luminance value of the jth gray scale
  • L target (j) is the target luminance value of the jth gray scale
  • T(j) is the gray scale value of the jth gray scale
  • a brightness adjusting device of a display device includes a memory and a processor.
  • the memory stores a maximum brightness value and a minimum brightness value of the display device and target gray curve data.
  • the processor is configured to: determine, according to the maximum brightness value and the minimum brightness value to be set, a gray level interval on the target gray curve; according to the gray level interval, on the target gray curve Determining a target brightness value of each gray level of the display device; and adjusting a brightness of the gray level of the display device based on the determined target brightness value.
  • the maximum brightness value and the minimum brightness value to be set are the maximum brightness value and the minimum brightness value of the gray level of the display device.
  • the maximum brightness value and the minimum brightness value to be set are a maximum brightness value and a minimum brightness value set according to a pre-specified standard.
  • the standard is the gray scale standard display function "GSDF" specified in the “DICOM” standard for digital imaging and communication in the medical field.
  • the processor is further configured to: cause the display device to display a grayscale image of each grayscale; obtain an initial luminance value of each grayscale; and determine a maximum luminance value and a minimum according to the initial luminance value Brightness value.
  • the processor is further configured to: follow the grayscale interval as described The number of gray levels of the display device is equally divided; and the brightness values corresponding to the respective points on the target gray curve are respectively determined as the target brightness values of the respective gray levels of the display device.
  • the processor is further configured to increase an initial brightness value of the gray level to be adjusted under the condition that the target brightness value of the gray level to be adjusted is higher than the initial brightness value thereof; Under the condition that the target brightness value is lower than its initial brightness value, the initial brightness value of the gray level to be adjusted is reduced.
  • the processor is further configured to increase or decrease an initial luminance value of the grayscale by increasing or decreasing an initial color component value of a grayscale.
  • the initial color component value is read from the display device.
  • the processor is further configured to: select, from an initial luminance value of each grayscale of the display device, an initial luminance value that is closest to a target luminance value of the grayscale to be adjusted; The initial color component value of the gray scale corresponding to the selected initial luminance value is used as the initial color component value of the gray scale to be adjusted.
  • the processor is further configured to: determine, according to the adjusted gray scales, whether the adjusted initial brightness value satisfies a predetermined condition, and if the adjusted initial brightness value does not satisfy the predetermined condition, Perform the adjustment again until all adjusted initial brightness values meet the predetermined conditions.
  • the predetermined condition is:
  • L adjust (j) is the adjusted initial luminance value of the jth gray scale
  • L target (j) is the target luminance value of the jth gray scale
  • T(j) is the gray scale value of the jth gray scale
  • Figure 1 shows a simplified block diagram of an exemplary display device
  • FIG. 2 exemplarily illustrates an example arrangement in which a brightness adjustment device of a display device is coupled to a display device, a colorimeter, to adjust brightness of a display device, in accordance with an embodiment of the present disclosure
  • FIG. 3 illustrates an exemplary structural block diagram of an adjustment apparatus according to an embodiment of the present disclosure
  • FIG. 4 illustrates a flowchart of a brightness adjustment method of a display device according to an embodiment of the present disclosure
  • Figure 5 shows a curve of the gray scale standard display function
  • FIG. 6 illustrates a flow chart of a brightness adjustment method of a display device according to another embodiment of the present disclosure.
  • the technical solution of the present disclosure is not limited to the DICOM standard, nor is it limited to the medical field.
  • the technical solutions of the embodiments of the present disclosure are equally applicable when the display device is adjusted for other specific standards in other fields.
  • the solution of the embodiments of the present disclosure can also be used in a dedicated display device such as military, geological exploration, and the like.
  • FIG. 1 shows a simplified block diagram of an exemplary display device 100.
  • the display device 100 includes a system integrated chip (SOC) control module 110 and a liquid crystal display (LCD) module 120.
  • SOC control module 110 includes a storage unit 112 and a control unit 114.
  • the LCD module 120 includes a driving unit 122 and a display unit 124.
  • the structure of the display device 100 is simplified in order to clearly describe the embodiments of the present disclosure without causing confusion to those skilled in the art. It should be understood by those skilled in the art that the structure of the display device 100 is not limited thereto, and may also include modules for implementing other functions. In other embodiments, display device 100 may only include LCD module 120, while SOC control module 110 may be located in a separate device, such as a graphics card device or processor device.
  • the connection relationship between the units and the modules already shown in the display device 100 is not limited thereto, and the embodiment of the present disclosure does not limit this.
  • the storage unit 112 stores an initial value of the gray scale of the display device 100.
  • This initial value can be a look up table (LUT) value.
  • the LUT value can be read, stored, or modified by control of the control unit 114 such that the LCD module 120 presents a corresponding brightness based on the drive signal generated based on the corresponding LUT value.
  • the LUT value may be a three component value, for example, in the RGB representation, including the R component, the G component, and the B component, and in the tristimulus values representation, may be the X component, the Y component, and
  • the Z component, in the color coordinate representation may be an x coordinate component, a y coordinate component, and a Y component.
  • the LUT value can be a single component value.
  • each row in Table 1 corresponds to a grayscale level (GL), which is GL 0 to GL 255 , respectively.
  • GL grayscale level
  • R, G, and B three LUT component values corresponding to R, G, and B, namely, R-LUT value, G-LUT value, and B-LUT value, are included.
  • Control unit 114 is coupled to storage unit 112 and is capable of controlling storage unit 112 to transmit signals to LCD module 120 based on its stored LUT value.
  • Control unit 114 can be a dedicated control unit or a universal control unit.
  • control unit 114 is coupled to a particular interface, such as an I 2 C interface, and control unit 114 operates on storage unit 112 in accordance with commands or requests received from a particular interface.
  • the control unit 114 is coupled to a plurality of different interfaces, such as an I 2 C interface and/or a DVI interface, etc., and the control unit 114 processes the signals from the different interfaces separately according to different protocols.
  • the control unit 114 can be implemented as a plurality of control units, each connected to an interface that processes signals from respective interfaces.
  • control unit 114 may perform different operations on memory unit 112 or control memory unit 112 for different operations.
  • the control unit 114 can receive the read signal, and read the initial value stored therein from the storage unit 112 according to the read signal, and send the read initial value to the sender of the read signal or Third party.
  • the control unit 114 can receive the modification signal and modify the initial value stored by the storage unit 112 according to the modification signal.
  • the driving unit 122 is configured to generate a corresponding driving signal according to the received signal, and drive the display unit 124 to perform corresponding display.
  • the drive unit 122 is coupled to the storage unit 112 to receive LUT values from the storage unit 112 and to generate corresponding drive signals based on the LUT values. It should be understood that although only the drive unit 122 is shown coupled to the storage unit 112 in FIG. 1, the drive unit 122 may be coupled to other components to obtain other types of output data, and based on some or all of the received data. Data to generate a drive signal.
  • the display unit 124 is for displaying under the driving of the driving signal.
  • display unit 124 can be implemented as a display panel.
  • FIG. 2 exemplarily shows an example arrangement in which a display device brightness adjustment device 200 (hereinafter referred to as "adjustment device 200") is connected to the display device 100 and the colorimeter 300 to adjust the brightness of the display device 100 according to an embodiment of the present disclosure. .
  • adjust device 200 a display device brightness adjustment device 200
  • the colorimeter 300 is coupled to the LCD module 120 of the display device 100 to measure the brightness of the image displayed by the display unit 124 therein.
  • the adjustment device 200 is coupled to the colorimeter 300 and the SOC module 110 of the display device 100, receives the measured luminance value from the colorimeter 300, and stores an initial stored in the storage unit 112 in the SOC module 110 based on the luminance value. The value is adjusted.
  • the adjusting device 200 is further configured to control the SOC module 110 to send an image corresponding to a specific gray scale to the LCD module 120 for display by the display unit 124 of the LCD module 120.
  • the colorimeter 300 can measure the brightness of the grayscale image displayed according to the initial value stored in the storage unit 122, and transmit it to the adjustment device 200 to determine how to perform the adjustment.
  • the adjustment device 200 is further operative to read the initial values stored therein from the storage unit 122. In another embodiment, the adjustment device 200 does not have to read data from the storage unit 122.
  • adjustment device 200 and colorimeter 300 are illustrated as two separate components in FIG. 2, in other embodiments, adjustment device 200 may include a colorimeter module such that no separate need is required. Colorimeter 300.
  • FIG. 3 illustrates an exemplary structural block diagram of an adjustment apparatus 200 in accordance with an embodiment of the present disclosure.
  • the adjustment device 200 includes a memory 210 and a processor 220.
  • the memory 210 is used to store or cache various data acquired by the adjustment device 200 from other entities (eg, the display device 100, the colorimeter 300, etc.), such as the initial brightness of each grayscale of the display device (eg, the display device 100). Value, adjusted initial brightness value, initial color component value, and so on.
  • the memory 210 is further configured to store various intermediate values generated during the adjustment process, such as the endpoints of the determined grayscale interval on the target grayscale curve and the grayscale values of the equal points, and the target luminance of each grayscale. Value, etc.
  • the memory 210 is also used to store data in advance, such as curve data of a target gray curve.
  • the processor 220 performs an operation for adjusting the brightness of the display device (eg, the display device 100).
  • processor 220 may be configured to perform at least a portion of the brightness adjustment methods 400, 600 of the display device as described below in connection with FIGS. 4, 6.
  • FIG. 4 illustrates a flow diagram of a method 400 of adjusting the brightness of a display device (eg, display device 100) in accordance with an embodiment of the present disclosure.
  • the method 400 begins in step S410, and determines a grayscale interval on a target grayscale curve based on a maximum luminance value and a minimum luminance value to be set. Then, in step S420, a target brightness value of each gray level of the display device is determined on the target gray level according to the gray level interval. Finally, in step S430, the brightness of the grayscale of the display device is adjusted based on the determined target brightness value.
  • the grayscale interval on the target grayscale curve is determined according to the maximum luminance value and the minimum luminance value to be set.
  • the maximum brightness value and the minimum brightness value to be set may be the maximum brightness value and the minimum brightness value of the gray level of the display device. Thereby, it is possible to ensure that the same device displays the consistency of the same image under different conditions.
  • the maximum brightness value and the minimum brightness value to be set may be a maximum brightness value and a minimum brightness value set according to a pre-specified standard.
  • the standard may be the gray scale standard display function "GSDF" specified in the "DICOM” standard for digital imaging and communication in the medical field. Thereby, the integrity of different devices when displaying the same image can be ensured.
  • the adjustment device 200 can instruct the SOC module 110 to send a grayscale image to the LCD module 120 via an interface (eg, a DVI interface) for display by the display unit 124.
  • the colorimeter 300 can measure the brightness of the displayed image to obtain initial luminance values for the respective gray levels.
  • the adjusting device 200 obtains each initial brightness value from the colorimeter 300, and determines a maximum brightness value and a minimum brightness value therefrom.
  • the monotonicity of the grayscale curve (Gamma curve) only the first grayscale and the last grayscale of the display device may be displayed, and the measured for the first grayscale The initial brightness value is taken as the minimum brightness value, and the initial brightness value measured for the last gray level is taken as the maximum brightness value.
  • the maximum brightness value and the minimum brightness value may be specified by manual input by a user or selected from alternative values according to the model number of the display device. In another embodiment, the maximum brightness value and the minimum brightness value may be set according to pre-specified criteria.
  • the standard may be the gray scale standard display function "GSDF" specified in the "DICOM” standard for digital imaging and communication in the medical field.
  • the target gradation curve may be any curve in which the gradation is the abscissa and the gradation (brightness) is the ordinate.
  • the number of gray levels is not limited by the number of gray levels of the display device. In one embodiment, the number of gray levels is greater than the number of gray levels of the display device. Different gray levels divide the gray space, and each gray level has a specific brightness to form a gray curve.
  • the GSDF curve is an example target grayscale curve.
  • the GSDF curve will be described as an example.
  • Chapter 14 of the DICOM standard document defines the GSDF function, and its function curve is shown in Figure 5.
  • the GSDF curve takes the distinguishable luminance difference (JND) value as the abscissa and the luminance as the ordinate.
  • the JND value indicates a grayscale value that divides the grayscale range of the display device into 1024 levels (greater than the number of grayscales of a typical display device, such as 256 grayscales of an 8-bit display device). ), each level corresponds to a brightness value.
  • step S410 the determination of the grayscale interval on the target grayscale curve may be implemented by: first, determining the target grayscale value corresponding to the minimum luminance value on the target grayscale curve as the grayscale level The first endpoint of the interval (ie, the lower bound). Then, the target gradation value corresponding to the maximum luminance value on the target gradation curve is determined as the second endpoint (ie, the upper bound) of the gradation interval.
  • the grayscale interval can be defined by the first endpoint and the second endpoint.
  • the GSDF curve as the target gradation curve as an example, assume that the number of gray levels of the display device is N, the minimum brightness value is L(0), and the maximum brightness value is L(N-1).
  • JND(N-1) corresponding to the gradation levels JND(0) and L(N-1) corresponding to L(0) is determined.
  • JND(0) and JND(N-1) are the endpoints of the grayscale interval, indicating that the JND range of the display device displaying DICOM characteristics is JND(0) ⁇ JND(N-1), and the luminance range is L(0).
  • JND(0) A+B ⁇ log 10 L(0)+C ⁇ (log 10 L(0)) 2 +D ⁇ (log 10 L(0)) 3 +E ⁇ (log 10 L(0)) 4 +F ⁇ (log 10 L(0)) 5 +G ⁇ (log 10 L(0)) 6 +H ⁇ (log 10 L(0)) 7 +I ⁇ (log 10 L(0)) 8
  • JND(255) A+B ⁇ log 10 L(255)+C ⁇ (log 10 L(255)) 2 +D ⁇ (log 10 L(255)) 3 +E ⁇ (log 10 L(255)) 4 +F ⁇ (log 10 L(255)) 5 +G ⁇ (log 10 L(255)) 6 +H ⁇ (log 10 L(255)) 7 +I ⁇ (log 10 L(255)) 8
  • step S420 the target luminance values of the respective gray scales of the display device can be obtained based on the grayscale intervals on the target grayscale curve determined in step S410.
  • determining the target brightness value of each gray level may be implemented by: first, dividing the determined gray level interval by the number of gray levels of the display device (eg, N-1 equal) . Then, the brightness values corresponding to the respective points on the target gray curve are respectively determined as the target brightness values of the respective gray levels of the display device.
  • L target (j) is the target luminance value of the jth gray scale
  • the values of the constants a, b, c, d, e, f, g, h, k, m satisfy:
  • step S430 the brightness of the grayscale of the display device is adjusted based on the target luminance value determined in step S420.
  • the specific adjustment is: when the target brightness value of the gray level to be adjusted is higher than the initial brightness value, the initial brightness value of the gray level to be adjusted is increased; the target brightness value of the gray level to be adjusted is lower than Under the condition of its initial brightness value, the initial brightness value of the gray level to be adjusted is reduced.
  • the adjustment of the initial luminance value is achieved by changing the parameters corresponding to the initial luminance values.
  • the initial luminance value of the grayscale is increased or decreased by increasing or decreasing the initial color component value of a grayscale.
  • the initial color component values may be stored in a storage unit of the display device (eg, storage unit 112 in FIG. 1).
  • the initial color component value can be a LUT value.
  • the LUT value may be a three-component value, for example, in the RGB representation, including the R component, the G component, and the B component, and in the tristimulus value representation, may be an X component, Y
  • the component and the Z component, in the color coordinate representation may be an x coordinate component, a y coordinate component, and a Y component.
  • the LUT value can be a single component value, ie there is only a single initial color component value for each gray level (eg, a black and white display device).
  • each adjustment only causes each initial color component value to change by a particular step value.
  • the step value may be predetermined or specified by the user through input or the like.
  • the R component, the G component, and the B component of the gray scale to be adjusted may be incremented by one under the condition that the target luminance value of the gray scale to be adjusted is higher than the initial luminance value thereof.
  • the above-described initial color component values of the respective gray levels of the display device may also be read from the display device to facilitate more optimal adjustment.
  • the brightness adjustment is implemented by: first, selecting a target brightness value of the gray level to be adjusted from the initial brightness values of the respective gray levels of the display device. The closest initial brightness value. Then, the initial color component value (read) of the gray scale corresponding to the selected initial luminance value is used as the initial color component value of the gray scale to be adjusted.
  • FIG. 6 illustrates a flow chart of a method 600 of adjusting the brightness of a display device (eg, display device 100) in accordance with another embodiment of the present disclosure.
  • the steps S610-S630 of the method 600 correspond to the steps S410-S430 of the method 400.
  • FIG. 4 For detailed description, reference may be made to the specific content of FIG. 4 above, and details are not described herein again.
  • the adjustment step is performed again until all the adjusted The initial brightness value satisfies the predetermined condition
  • the method 600 may further include the following steps S640-S670.
  • step S640 the display device is caused to display the grayscale image of each grayscale again, so that the brightness of the grayscale image can be measured, and each is obtained.
  • the adjusted initial brightness value of the grayscale is obtained after the step S630 of adjusting the brightness of the grayscale of the display device.
  • step S650 the adjusted initial brightness values of the respective gray levels are acquired.
  • the adjustment device 200 can instruct the SOC module 110 to transmit a grayscale image to the LCD module 120 again via an interface (eg, a DVI interface) for display by the display unit 124.
  • the colorimeter 300 can measure the brightness of the displayed image to obtain an adjusted initial brightness value for each gray scale.
  • the adjustment device 200 acquires each adjusted initial brightness value from the colorimeter 300.
  • step S660 it is determined whether the adjusted initial luminance value satisfies a predetermined condition for each grayscale to be adjusted.
  • the predetermined condition is defined by a luminance response value R:
  • L adjust (j) is the adjusted initial luminance value of the jth gray scale
  • L target (j) is the target luminance value of the jth gray scale
  • T(j) is the gray scale value of the jth gray scale
  • p is a constant between 0 and 1.
  • T(j) is JND(j).
  • the predetermined condition is defined by a difference in luminance:
  • the predetermined price adjustment is defined by an overall brightness difference value over the entire gray level interval:
  • p is a normal number.
  • p can be on the order of hundreds.
  • step S660 determines that the adjusted initial luminance value satisfies the predetermined condition. If it is determined in step S660 that the adjusted initial luminance value satisfies the predetermined condition, the method 600 proceeds to step S670 to end the adjustment.
  • step S660 determines that the adjusted initial luminance value does not satisfy the predetermined condition
  • the method 600 proceeds to step S630 to perform the adjustment of the next round with the adjusted initial luminance value as the initial luminance value. This iteration is continued until the obtained adjusted initial luminance value satisfies the predetermined condition.
  • a computer program eg, implemented as one or more programs running on one or more computer systems
  • implemented as one or more programs running on one or more processors eg, implemented as one or One or more programs running on a plurality of microprocessors, implemented as firmware, or substantially in any combination of the above, and those skilled in the art, in accordance with the present disclosure, will be provided with design circuitry and/or write software and / or firmware code capabilities.
  • processors eg, implemented as one or One or more programs running on a plurality of microprocessors, implemented as firmware, or substantially in any combination of the above, and those skilled in the art, in accordance with the present disclosure, will be provided with design circuitry and/or write software and / or firmware code capabilities.
  • the mechanisms of the subject matter described herein can be distributed as a variety of forms of program products, and regardless of the particular type of signal-bearing medium that is actually used to perform the distribution, the subject matter of the present disclosure
  • the exemplary embodiments are applicable.
  • signal bearing media examples include, but are not limited to, recordable media such as floppy disks, hard drives, compact disks (CDs), digital versatile disks (DVDs), digital tapes, computer memories, and the like; and transmission-type media such as digital and / or analog communication media (eg, fiber optic cable, waveguide, wired communication link, wireless communication link, etc.).
  • recordable media such as floppy disks, hard drives, compact disks (CDs), digital versatile disks (DVDs), digital tapes, computer memories, and the like
  • transmission-type media such as digital and / or analog communication media (eg, fiber optic cable, waveguide, wired communication link, wireless communication link, etc.).

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Abstract

一种显示设备（100）的亮度调整方法（400）和调整装置（200）。显示设备（100）的亮度调整方法（400）包括以下步骤：基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间（S410）；根据灰度等级区间，在目标灰度曲线上，确定显示设备（100）的各个灰阶的目标亮度值（S420）；以及基于所确定的目标亮度值，对显示设备（100）的灰阶的亮度进行调整（S430）。

Description

显示设备的亮度调整方法和调整装置
相关申请的交叉引用
本申请要求于2017年5月12日递交的题为“显示设备的灰阶亮度调整方法和调整装置”的中国专利申请(申请号201710333374.9)的优先权，在此以全文引用的方式将该中国专利申请并入本文中。
技术领域
本公开涉及显示技术领域，具体地涉及显示设备的灰阶亮度调整方法和调整装置。
背景技术
随着显示技术的不断发展，已经能够制造出在亮度、对比度、分辨率、尺寸等各方面满足多种性能需求的显示设备。具有高性能的显示设备在各个领域中发挥着重要的作用。然而，在某些领域中，除了上述通用性能参数外，在其他方面还存在着严格的要求。比如，在医用显示设备领域，为了例如更加准确地通过影像进行会诊，需要医用显示设备具有更好的整体性和一致性。具体地，整体性要求在不同会诊地点的医生通过不同的显示器能够看到同样的图像显示效果(亮度、灰度、对比度等)，从而能够基于同样的事实进行判断和交流。一致性要求同一医生所使用的医用显示设备在不同的使用时段、使用地点、使用环境下能够针对同一显示对象呈现相同的显示效果。
在医学领域，为了实现上述整体性和一致性，在医疗领域数字成像与通信(DICOM)标准中规定了灰度标准显示函数(GSDF)，通常需要对医用显示设备的灰阶亮度(luminance)进行调整，以便与GSDF曲线相一致。
需要一种能够快速、准确地将显示设备的灰阶亮度调整为适应特定标准(比如DICOM标准)的方法。
发明内容
为了至少部分解决或减轻上述问题，本公开提出了显示设备的亮度调整方 法和调整装置。
根据本公开的一个方面，提出了一种显示设备的亮度调整方法。所述方法包括以下步骤：基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间；根据所述灰度等级区间，在所述目标灰度曲线上，确定所述显示设备的各个灰阶的目标亮度值；以及基于所确定的目标亮度值，对所述显示设备的灰阶的亮度进行调整。
在一个实施例中，所述欲设置的最大亮度值和最小亮度值是所述显示设备的灰阶的最大亮度值和最小亮度值。
在一个实施例中，所述欲设置的最大亮度值和最小亮度值是根据预先指定的标准来设置的最大亮度值和最小亮度值。
在一个实施例中，所述标准是医疗领域数字成像与通信“DICOM”标准中规定的灰度标准显示函数“GSDF”。
在一个实施例中，所述方法还包括：使显示设备显示各个灰阶的灰阶图像；获取各个灰阶的初始亮度值；以及根据所述初始亮度值，确定最大亮度值和最小亮度值。
在一个实施例中，所述确定各个灰阶的目标亮度值的步骤包括：将所述灰度等级区间按照所述显示设备的灰阶数量等分；以及将所述目标灰度曲线上与各等分点对应的亮度值分别确定为所述显示设备的各个灰阶的目标亮度值。
在一个实施例中，对所述显示设备的灰阶的亮度进行调整包括：在待调整灰阶的目标亮度值高于其初始亮度值的条件下，增加待调整灰阶的初始亮度值；在待调整灰阶的目标亮度值低于其初始亮度值的条件下，减小待调整灰阶的初始亮度值。
在一个实施例中，通过增加或减小一灰阶的初始颜色分量值，增加或减小所述灰阶的初始亮度值。
在一个实施例中，所述初始颜色分量值是从所述显示设备读取的。
在一个实施例中，从所述显示设备的各个灰阶的初始亮度值中，选择与待调整灰阶的目标亮度值最接近的初始亮度值；以及将所选择的初始亮度值所对应的灰阶的初始颜色分量值用作所述待调整灰阶的初始颜色分量值。
在一个实施例中，所述方法还包括：针对调整后的各个灰阶，判断调整后 的初始亮度值是否满足预定条件，在调整后的初始亮度值不满足预定条件的情况下，再次执行调整步骤，直至所有调整后的初始亮度值都满足预定条件为止。
在一个实施例中，所述预定条件为：
Figure PCTCN2017116574-appb-000001
其中，
Figure PCTCN2017116574-appb-000002
Figure PCTCN2017116574-appb-000003
Ladjust(j)是第j个灰阶的调整后的初始亮度值，Ltarget(j)是第j个灰阶的目标亮度值，T(j)是第j个灰阶的灰度等级值，p是0到1之间的常数，其中，j＝1、2、...、N-1，N是显示设备的灰阶数量。
根据本公开的另一方面，提供了一种显示设备的亮度调整装置。所述调整装置包括存储器和处理器。所述存储器存储显示设备的最大亮度值和最小亮度值以及目标灰度曲线数据。所述处理器被配置为：基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间；根据所述灰度等级区间，在所述目标灰度曲线上，确定所述显示设备的各个灰阶的目标亮度值；以及基于所确定的目标亮度值，对所述显示设备的灰阶的亮度进行调整。
在一个实施例中，所述欲设置的最大亮度值和最小亮度值是所述显示设备的灰阶的最大亮度值和最小亮度值。
在一个实施例中，所述欲设置的最大亮度值和最小亮度值是根据预先指定的标准来设置的最大亮度值和最小亮度值。
在一个实施例中，所述标准是医疗领域数字成像与通信“DICOM”标准中规定的灰度标准显示函数“GSDF”。
在一个实施例中，所述处理器还被配置为：使显示设备显示各个灰阶的灰阶图像；获取各个灰阶的初始亮度值；以及根据所述初始亮度值，确定最大亮度值和最小亮度值。
在一个实施例中，所述处理器还被配置为：将所述灰度等级区间按照所述 显示设备的灰阶数量等分；以及将所述目标灰度曲线上与各等分点对应的亮度值分别确定为所述显示设备的各个灰阶的目标亮度值。
在一个实施例中，所述处理器还被配置为：在待调整灰阶的目标亮度值高于其初始亮度值的条件下，增加待调整灰阶的初始亮度值；在待调整灰阶的目标亮度值低于其初始亮度值的条件下，减小待调整灰阶的初始亮度值。
在一个实施例中，所述处理器还被配置为：通过增加或减小一灰阶的初始颜色分量值，增加或减小所述灰阶的初始亮度值。
在一个实施例中，所述初始颜色分量值是从所述显示设备读取的.
在一个实施例中，所述处理器还被配置为：从所述显示设备的各个灰阶的初始亮度值中，选择与待调整灰阶的目标亮度值最接近的初始亮度值；以及将所选择的初始亮度值所对应的灰阶的初始颜色分量值用作所述待调整灰阶的初始颜色分量值。
在一个实施例中，所述处理器还被配置为：针对调整后的各个灰阶，判断调整后的初始亮度值是否满足预定条件，在调整后的初始亮度值不满足预定条件的情况下，再次执行调整，直至所有调整后的初始亮度值都满足预定条件为止。
在一个实施例中，所述预定条件为：
Figure PCTCN2017116574-appb-000004
其中，
Figure PCTCN2017116574-appb-000005
Figure PCTCN2017116574-appb-000006
Ladjust(j)是第j个灰阶的调整后的初始亮度值，Ltarget(j)是第j个灰阶的目标亮度值，T(j)是第j个灰阶的灰度等级值，p是0到1之间的常数，其中，j＝1、2、...、N-1，N是显示设备的灰阶数量。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图，图中：
图1示出了一种示例性显示设备的简化结构框图；
图2示例性地示出了根据本公开实施例的显示设备的亮度调整装置与显示设备、色度仪连接以调整显示设备的亮度的示例布置；
图3示出了根据本公开实施例的调整装置的示例性结构框图；
图4示出了根据本公开实施例的显示设备的亮度调整方法的流程图；
图5示出了灰度标准显示函数的曲线；以及
图6示出了根据本公开另一实施例的显示设备的亮度调整方法的流程图。
具体实施方式
下面将详细描述本公开的具体实施例，应当注意，这里描述的实施例只用于举例说明，并不用于限制本公开。在以下描述中，为了提供对本公开的透彻理解，阐述了大量特定细节。然而，对于本领域普通技术人员显而易见的是：不必采用这些特定细节来实行本公开。在其他实例中，为了避免混淆本公开，未具体描述公知的电路、材料或方法。
在整个说明书中，对“一个实施例”、“实施例”、“一个示例”或“示例”的提及意味着：结合该实施例或示例描述的特定特征、结构或特性被包含在本公开至少一个实施例中。因此，在整个说明书的各个地方出现的短语“在一个实施例中”、“在实施例中”、“一个示例”或“示例”不一定都指同一实施例或示例。此外，可以以任何适当的组合和/或子组合将特定的特征、结构或特性组合在一个或多个实施例或示例中。此外，本领域普通技术人员应当理解，在此提供的附图都是为了说明的目的，并且附图不一定是按比例绘制的。这里使用的术语“和/或”包括一个或多个相关列出的项目的任何和所有组合。
在说明书中，某些内容是以DICOM标准作为示例背景进行描述的，但应该理解的是，本公开的技术方案不限于DICOM标准，也不限于医疗领域，在 针对其他领域的其他特定标准对显示设备进行调整时，本公开各实施例的技术方案同样适用。例如，本公开的实施例的方案也可以用于军用、地质勘探等专用显示设备中。
以下参考附图对本公开的实施例进行具体描述。
首先，图1示出了一种示例性显示设备100的简化结构框图。
从图1可见，显示设备100包括系统集成芯片(SOC)控制模块110和液晶显示器(LCD)模块120。SOC控制模块110包括存储单元112和控制单元114。LCD模块120包括驱动单元122和显示单元124。为了清楚描述本公开的实施例，而不对本领域技术人员造成混淆，所以对显示设备100的结构进行了简化。本领域技术人员应该理解的是，显示设备100的结构不限于此，其还可以包括用于实现其他功能的模块。在另一些实施例中，显示设备100可以只包括LCD模块120，而SOC控制模块110可以位于单独的设备中，比如显卡设备或处理器设备等。此外，本领域技术人员应该理解的是，针对显示设备100中已经示出的单元和模块，其连接关系也不限于此，本公开的实施例不对此进行限定。
具体地，存储单元112存储有显示设备100的灰阶的初始值。该初始值可以是查找表(LUT)值。可以通过控制单元114的控制来读取、存储或修改LUT值，以使得LCD模块120根据基于相应的LUT值产生的驱动信号呈现相应的亮度。在一个实施例中，LUT值可以是三分量值，例如，在RGB表象中，包括R分量、G分量和B分量，在三刺激值(tristimulus values)表象中，可以是X分量、Y分量和Z分量，在色坐标表象中，可以是x坐标分量、y坐标分量和Y分量。在另一实施例中，LUT值可以是单分量值。
作为示例，下表1中示出了RGB表象中的LUT值的示例格式：
表1
灰阶 R-LUT值 G-LUT值 B-LUT值
GL0      
GL1      
GL2      
...... ...... ...... ......
GL253      
GL254      
GL255      
如上，表1中的每一行对应于一个灰阶(grayscale level，GL)，分别是GL0到GL255。在每一行中，包括分别对应于R、G和B的三个LUT分量值，即R-LUT值、G-LUT值和B-LUT值。
控制单元114连接到存储单元112，能够控制存储单元112基于其存储的LUT值向LCD模块120发送信号。控制单元114可以是专用控制单元或通用控制单元。在一个实施例中，控制单元114连接到特定接口，例如，I2C接口，控制单元114根据从特定接口接收的命令或请求，对存储单元112进行操作。在另一实施例中，控制单元114连接到多个不同的接口，例如，I2C接口和/或DVI接口等，控制单元114根据不同的协议对来自不同接口的信号分别进行处理。在又一实施例中，控制单元114可以实现为多个控制单元，每个控制单元连接到一个接口，分别对来自相应接口的信号进行处理。
根据所接收的信号，控制单元114可以对存储单元112进行不同的操作或控制存储单元112进行不同的操作。举例来讲，控制单元114可以接收读取信号，并根据所述读取信号从存储单元112读取其中所存储的初始值，并将所读取的初始值发送给读取信号的发送方或第三方。再例如，控制单元114可以接收修改信号，并根据所述修改信号对存储单元112所存储的初始值进行修改。
驱动单元122用于根据接收的信号产生相应的驱动信号，驱动显示单元124进行相应的显示。驱动单元122连接到存储单元112，以从存储单元112接收LUT值，并基于所述LUT值产生相应的驱动信号。应该理解的是，虽然图1中只示出了驱动单元122连接到存储单元112，但是驱动单元122还可以连接到其他的组件，以获得其他类型的输出数据，并基于所接收的部分或全部数据来产生驱动信号。
显示单元124用于在驱动信号的驱动下进行显示。例如，显示单元124可以实现为显示面板。
图2示例性地示出了根据本公开实施例的显示设备亮度调整装置200(下文中简称“调整装置200”)与显示设备100、色度仪300连接以调整显示设备100的亮度的示例布置。
从图2可见，色度仪300连接到显示设备100的LCD模块120，以测量其中的显示单元124所显示的图像的亮度。调整装置200与色度仪300和显示设备100的SOC模块110连接，从所述色度仪300接收所测量的亮度值，并基于所述亮度值对SOC模块110中的存储单元112存储的初始值进行调整。
调整装置200还用于控制SOC模块110向LCD模块120发送对应于特定灰阶的图像，以通过LCD模块120的显示单元124进行显示。从而，色度仪300能够对根据所述存储单元122中存储的初始值显示的灰阶图像的亮度进行测量，并发送给调整装置200以判断如何进行调整。
在一个实施例中，调整装置200还用于从存储单元122读取其中所存储的初始值。在另一实施例中，调整装置200不必从存储单元122读取数据。
应该理解的是，虽然图2中将调整装置200和色度仪300示为两个独立的组件，但是在其他实施例中，所述调整装置200可以包括色度仪模块，从而不再需要单独的色度仪300。
图3示出了根据本公开实施例的调整装置200的示例性结构框图。
从图3可见，调整装置200包括存储器210和处理器220。
存储器210用于存储或缓存调整装置200从其他实体(比如，显示设备100、色度仪300等)所获取的各种数据，比如显示设备(例如，显示设备100)的各个灰阶的初始亮度值、调整后的初始亮度值、初始颜色分量值等。所述存储器210还用于存储调整过程中产生的各种中间值，比如目标灰度曲线上的所确定的灰度等级区间的端点及等分点的灰度等级值、各灰阶的目标亮度值等。所述存储器210还用于预先存储数据，比如目标灰度曲线的曲线数据。
处理器220执行用于对显示设备(例如，显示设备100)的亮度进行调整的操作。在一个实施例中，处理器220可以被配置为执行如以下结合图4、图6所描述的显示设备的亮度调整方法400、600中的至少一部分步骤。
图4示出了根据本公开实施例的显示设备(例如，显示设备100)亮度的调整方法400的流程图。作为本公开的实施例，从图4可见，所述方法400开始于步骤S410，基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间。然后，在步骤S420中，根据所述灰度等级区间，在所述目标灰度曲线上，确定所述显示设备的各个灰阶的目标亮度值。最后，在步骤S430中，基于所确定的目标亮度值，对显示设备的灰阶的亮度进行调整。
首先，在步骤S410中，根据欲设置的最大亮度值和最小亮度值确定目标灰度曲线上的灰度等级区间。在一个实施例中，欲设置的最大亮度值和最小亮度值可以是显示设备的灰阶的最大亮度值和最小亮度值。从而，可以保证同一设备在不同情况下显示相同图像的一致性。在另一个实施例中，该欲设置的最大亮度值和最小亮度值可以是根据预先指定的标准来设置的最大亮度值和最小亮度值。例如，该标准可以是医疗领域数字成像与通信“DICOM”标准中规定的灰度标准显示函数“GSDF”。从而，可以保证不同设备在显示相同图像时的整体性。
显示设备的灰阶的数量是由显示设备适于接收的输入信号的位(bit)数决定的，比如，如果显示设备是8比特显示器，则其具有28＝256个灰阶。
在一个实施例中，为了获得最大亮度值和最小亮度值，需要先使显示设备显示其各个灰阶的灰阶图像，以使得能够对灰阶图像的亮度进行测量，得到各个灰阶的初始亮度值。从而，可以从各个灰阶的初始亮度值中确定最大值和最小值，即所述最大亮度值和最小亮度值。例如，在图2所示的布置中，调整装置200可以通过接口(例如，DVI接口)指示SOC模块110向LCD模块120发送灰阶图像，以通过显示单元124进行显示。从而，色度仪300可以对所显示的图像的亮度进行测量，得到各个灰阶的初始亮度值。调整装置200从色度仪300获得各初始亮度值，并从中确定出最大亮度值和最小亮度值。
在另一实施例中，根据灰阶曲线(Gamma曲线)的单调性，可以只针对显示设备的第一个灰阶和最后一个灰阶进行显示，并将针对第一个灰阶所测得的初始亮度值作为最小亮度值，将针对最后一个灰阶所测得的初始亮度值作为最大亮度值。
在另一实施例中，所述最大亮度值和最小亮度值可以是通过用户手工输入指定的或根据显示设备的型号从备选值中选择的。在另一实施例中，所述最大亮度值和最小亮度值可以是根据预先指定的标准来设置的。例如，该标准可以是医疗领域数字成像与通信“DICOM”标准中规定的灰度标准显示函数“GSDF”。
目标灰度曲线可以是任何以灰度等级为横坐标、以灰度(亮度)为纵坐标的曲线。灰度等级的数量不受显示设备灰阶数量的限制。在一个实施例中，灰度等级的数量大于显示设备灰阶的数量。不同的灰度等级对灰度空间进行划分，每个灰度等级具有特定的亮度，从而形成灰度曲线。
举例来讲，在DICOM标准中，GSDF曲线是一种示例的目标灰度曲线。在下文中，将以GSDF曲线为示例进行描述。具体地，DICOM标准文档的第14章定义了GSDF函数，其函数曲线如图5所示。从图5可以看出，GSDF曲线以可分辨亮度差(JND)值作为横坐标，以亮度作为纵坐标。从这个曲线上可以看出，JND值标示了一种灰度等级值，其将显示设备的灰度范围分成1024个等级(大于一般显示设备的灰阶数量，例如8bit显示设备的256个灰阶)，每个等级对应一个亮度值。
在步骤S410中，可以通过以下操作来实现对目标灰度曲线上的灰度等级区间的确定：首先，将目标灰度曲线上与最小亮度值相对应的目标灰度等级值确定为灰度等级区间的第一端点(即下界)。然后，将目标灰度曲线上与最大亮度值相对应的目标灰度等级值确定为灰度等级区间的第二端点(即上界)。从而，通过第一端点和第二端点可以限定出所述灰度等级区间。
以GSDF曲线作为目标灰度曲线的情形为例，假定显示设备的灰阶数量为N，最小亮度值为L(0)，最大亮度值为L(N-1)。利用图5所示的GSDF函数曲线，确定L(0)所对应的灰度等级JND(0)和L(N-1)所对应的JND(N-1)。JND(0)和JND(N-1)即为灰度等级区间的端点，表明显示设备显示DICOM特性的JND范围是JND(0)～JND(N-1)，而亮度范围是L(0)～L(N-1)，
具体地，在如上根据亮度计算JND时可以采用以下计算公式(以N等于256为例)：
JND(0)＝A+B×log10L(0)+C×(log10L(0))2+D×(log10L(0))3+E×(log10L(0))4+F×(log10L(0))5+G×(log10L(0))6+H×(log10L(0))7+I×(log10L(0))8
JND(255)＝A+B×log10L(255)+C×(log10L(255))2+D×(log10L(255))3+E×(log10L(255))4+F×(log10L(255))5+G×(log10L(255))6+H×(log10L(255))7+I×(log10L(255))8
其中，A、B、C、D、E、F、G、H、I的值满足：
A＝71.498068 D＝9.8247004 G＝-0.18014349
B＝94.593053 E＝0.28175407 H＝0.14710899
C＝41.912053 F＝-1.1878455 I＝-0.017046845
接下来，在步骤S420中，根据在步骤S410中所确定的目标灰度曲线上的灰度等级区间，可以得到显示设备的各个灰阶的目标亮度值。
在一个实施例中，确定各个灰阶的目标亮度值可以通过以下操作来实现：首先，将所确定的灰度等级区间按照显示设备的灰阶数量进行等分(例如，N-1等分)。然后，将目标灰度曲线上与各等分点对应的亮度值分别确定为所述显示设备的各个灰阶的目标亮度值。
具体地，以GSDF函数曲线为例，可以通过以下公式来进行等分：
Figure PCTCN2017116574-appb-000007
其中，j＝1、2、...、N-1。
接下来，根据等分得到的各个JND(j)，可以通过以下公式来得到各个点所对应的亮度值(同样以N＝256为例)：
log10Ltarget(j)＝
Figure PCTCN2017116574-appb-000008
其中，Ltarget(j)是第j个灰阶的目标亮度值，常数a、b、c、d、e、f、g、h、k、m的值满足：
a＝-1.301877 d＝-1.0320229E-1 g＝-2.5468404E-2 k＝1.2992634E-4
b＝-2.5840191E-2 e＝1.3646699E-1 h＝-3.1978977E-3 m＝1.3635334E-3
c＝8.0242636E-2 f＝2.8745620E-2    
应当注意以上划分方式(等分)并不是唯一的，也可以采用其他的划分方式。
最后，在步骤S430中，基于在步骤S420中所确定的目标亮度值，对显示设备的灰阶的亮度进行调整。
在该步骤中，具体的调整为：在待调整灰阶的目标亮度值高于其初始亮度值的条件下，增加待调整灰阶的初始亮度值；在待调整灰阶的目标亮度值低于其初始亮度值的条件下，减小待调整灰阶的初始亮度值。
在一个实施例中，通过改变与初始亮度值相对应的参数来实现对初始亮度值的调节。
在一个实施例中，通过增加或减小一灰阶的初始颜色分量值，来增加或减小所述灰阶的初始亮度值。
初始颜色分量值可以存储在显示设备的存储单元(例如，图1中的存储单元112)中。初始颜色分量值可以是LUT值。如上文所述，在一个实施例中，该LUT值可以是三分量值，例如，在RGB表象中，包括R分量、G分量和B分量，在三刺激值表象中，可以是X分量、Y分量和Z分量，在色坐标表象中，可以是x坐标分量、y坐标分量和Y分量。在另一实施例中，LUT值可以是单分量值，即针对每个灰阶只有单个初始颜色分量值(比如，黑白显示设备)。
在一个实施例中，每次调整只使得各个初始颜色分量值改变特定的步长值。所述步长值可以是预定的或由用户通过输入等方式指定的。举例来讲，在RGB分量的情况中，在待调整灰阶的目标亮度值高于其初始亮度值的条件下，可以将待调整灰阶的R分量、G分量和B分量均加1。
在另一实施例中，还可以从显示设备读取显示设备的各个灰阶的上述初始颜色分量值，以便于更优化地进行调整。
具体地，在这一实施例中，针对特定的待调整的灰阶，亮度调整通过以下操作实现：首先，从显示设备的各个灰阶的初始亮度值中选择与待调整灰阶的目标亮度值最接近的初始亮度值。然后，将该所选择的初始亮度值所对应的灰阶的初始颜色分量值(已读取)用作所述待调整灰阶的初始颜色分量值。
图6示出了根据本公开另一实施例的显示设备(例如，显示设备100)亮度的调整方法600的流程图。方法600的步骤S610-S630与方法400的步骤S410-S430相对应，详细描述可参考以上关于图4的具体内容，在此不再赘述。
在方法600中，针对调整后的各个灰阶，判断调整后的初始亮度值是否满足预定条件，在调整后的初始亮度值不满足预定条件的情况下，再次执行调整步骤，直至所有调整后的初始亮度值都满足预定条件为止
具体地，方法600还可以包括以下步骤S640-S670。
首先，在对显示设备的灰阶的亮度进行调整的步骤S630之后，在步骤S640中，使显示设备再次显示各个灰阶的灰阶图像，以使得能够对灰阶图像的亮度进行测量，得到各个灰阶的调整后的初始亮度值。
然后，在步骤S650中，获取各个灰阶的调整后的初始亮度值。
例如，在图2所示的布置中，调整装置200可以通过接口(例如，DVI接口)指示SOC模块110向LCD模块120再次发送灰阶图像，以通过显示单元124进行显示。从而，色度仪300可以对显示的图像的亮度进行测量，得到各个灰阶的调整后的初始亮度值。调整装置200从色度仪300获取各调整后的初始亮度值。
接下来，在步骤S660中，针对各个待调整灰阶，判断调整后的初始亮度值是否满足预定条件。
在一个实施例中，所述预定条件通过亮度响应值R来限定：
Figure PCTCN2017116574-appb-000009
其中，
Figure PCTCN2017116574-appb-000010
Figure PCTCN2017116574-appb-000011
Ladjust(j)是第j个灰阶的调整后的初始亮度值，Ltarget(j)是第j个灰阶的目标亮度值，T(j)是第j个灰阶的灰度等级值，p是0到1之间的常数。
在针对GSDF函数曲线的情况中，T(j)即是JND(j)。
在另一实施例中，所述预定条件通过亮度差值来限定：
针对每个灰阶，|Ladjust(j)-Ltarget(j)|≤p′，其中p′为正常数。例如，在一个实施例中，p′可以是几十的量级。
在另一实施例中，所述预定调价通过整个灰度等级区间上的整体亮度差值来限定：
针对整个区间，
Figure PCTCN2017116574-appb-000012
其中p″为正常数。例如，在一个实施例中，p″可以是几百的量级。
在步骤S660中确定调整后的初始亮度值满足预定条件的条件下，所述方法600进行到步骤S670，结束调整。
在步骤S660中确定调整后的初始亮度值不满足预定条件的条件下，所述方法600进行到步骤S630，以调整后的初始亮度值作为初始亮度值来进行下一轮的调整。如此迭代下去，直到得到的调整后的初始亮度值满足所述预定条件为止。
以上的详细描述通过使用示意图、流程图和/或示例，已经阐述了众多实施例。在这种示意图、流程图和/或示例包含一个或多个功能和/或操作的情况下，本领域技术人员应理解，这种示意图、流程图或示例中的每一功能和/或 操作可以通过各种结构、硬件、软件、固件或实质上它们的任意组合来单独和/或共同实现。在一个实施例中，本公开的实施例所述主题的若干部分可以通过专用集成电路(ASIC)、现场可编程门阵列(FPGA)、数字信号处理器(DSP)、或其他集成格式来实现。然而，本领域技术人员应认识到，这里所公开的实施例的一些方面在整体上或部分地可以等同地实现在集成电路中，实现为在一台或多台计算机上运行的一个或多个计算机程序(例如，实现为在一台或多台计算机系统上运行的一个或多个程序)，实现为在一个或多个处理器上运行的一个或多个程序(例如，实现为在一个或多个微处理器上运行的一个或多个程序)，实现为固件，或者实质上实现为上述方式的任意组合，并且本领域技术人员根据本公开，将具备设计电路和/或写入软件和/或固件代码的能力。此外，本领域技术人员将认识到，本公开所述主题的机制能够作为多种形式的程序产品进行分发，并且无论实际用来执行分发的信号承载介质的具体类型如何，本公开所述主题的示例性实施例均适用。信号承载介质的示例包括但不限于：可记录型介质，如软盘、硬盘驱动器、紧致盘(CD)、数字通用盘(DVD)、数字磁带、计算机存储器等；以及传输型介质，如数字和/或模拟通信介质(例如，光纤光缆、波导、有线通信链路、无线通信链路等)。
虽然已参照几个典型实施例描述了本公开，但应当理解，所用的术语是说明和示例性、而非限制性的术语。由于本公开能够以多种形式具体实施而不脱离公开的精神或实质，所以应当理解，上述实施例不限于任何前述的细节，而应在随附权利要求所限定的精神和范围内广泛地解释，因此落入权利要求或其等效范围内的全部变化和改型都应为随附权利要求所涵盖。

Claims (20)

  1. 一种显示设备的亮度调整方法，包括：
    基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间；
    根据所述灰度等级区间，在所述目标灰度曲线上，确定所述显示设备的各个灰阶的目标亮度值；以及
    基于所确定的目标亮度值，对所述显示设备的灰阶的亮度进行调整。
  2. 根据权利要求1所述的方法，其中，所述欲设置的最大亮度值和最小亮度值是所述显示设备的灰阶的最大亮度值和最小亮度值。
  3. 根据权利要求2所述的方法，包括：
    使显示设备显示各个灰阶的灰阶图像；
    获取各个灰阶的初始亮度值；以及
    根据所述初始亮度值，确定最大亮度值和最小亮度值。
  4. 根据权利要求1所述的方法，其中，所述欲设置的最大亮度值和最小亮度值是根据预先指定的标准来设置的最大亮度值和最小亮度值。
  5. 根据权利要求1所述的方法，其中，所述确定各个灰阶的目标亮度值的步骤包括：
    将所述灰度等级区间按照所述显示设备的灰阶数量等分；以及
    将所述目标灰度曲线上与各等分点对应的亮度值分别确定为所述显示设备的各个灰阶的目标亮度值。
  6. 根据权利要求1所述的方法，其中，所述对所述显示设备的灰阶的亮度进行调整包括：
    在待调整灰阶的目标亮度值高于其初始亮度值的条件下，增加待调整灰阶的初始亮度值；
    在待调整灰阶的目标亮度值低于其初始亮度值的条件下，减小待调整灰阶的初始亮度值。
  7. 根据权利要求6所述的方法，其中，通过增加或减小一灰阶的初始颜色分量值，增加或减小所述灰阶的初始亮度值。
  8. 根据权利要求7所述的方法，其中，所述初始颜色分量值是从所述显示设备读取的；从所述显示设备的各个灰阶的初始亮度值中，选择与待调整灰阶的目标亮度值最接近的初始亮度值；以及将所选择的初始亮度值所对应的灰阶的初始颜色分量值用作所述待调整灰阶的初始颜色分量值。
  9. 根据权利要求6所述的方法，还包括：
    针对调整后的各个灰阶，判断调整后的初始亮度值是否满足预定条件，在调整后的初始亮度值不满足预定条件的情况下，再次执行调整步骤，直至所有调整后的初始亮度值都满足预定条件为止。
  10. 根据权利要求9所述的方法，其中，所述预定条件为：
    Figure PCTCN2017116574-appb-100001
    其中，
    Figure PCTCN2017116574-appb-100002
    Figure PCTCN2017116574-appb-100003
    Ladjust(j)是第j个灰阶的调整后的初始亮度值，Ltarget(j)是第j个灰阶的目标亮度值，T(j)是第j个灰阶的灰度等级值，p是0到1之间的常数，其中，j＝1、2、…、N-1，N是显示设备的灰阶数量。
  11. 一种显示设备的亮度调整装置，包括：
    存储器，存储目标灰度曲线数据；
    处理器，被配置为
    基于欲设置的最大亮度值和最小亮度值，在目标灰度曲线上，确定灰度等级区间；
    根据所述灰度等级区间，在所述目标灰度曲线上，确定所述显示设备的各个灰阶的目标亮度值；以及
    基于所确定的目标亮度值，对所述显示设备的灰阶的亮度进行调整。
  12. 根据权利要求11所述的调整装置，其中，所述欲设置的最大亮度值和最小亮度值是所述显示设备的灰阶的最大亮度值和最小亮度值。
  13. 根据权利要求12所述的调整装置，其中，所述处理器还被配置为：
    使显示设备显示各个灰阶的灰阶图像；
    获取各个灰阶的初始亮度值；以及
    根据所述初始亮度值，确定最大亮度值和最小亮度值。
  14. 根据权利要求11所述的调整装置，其中，所述欲设置的最大亮度值和最小亮度值是根据预先指定的标准来设置的最大亮度值和最小亮度值。
  15. 根据权利要求11所述的调整装置，其中，所述处理器还被配置为：
    将所述灰度等级区间按照所述显示设备的灰阶数量等分；以及
    将所述目标灰度曲线上与各等分点对应的亮度值分别确定为所述显示设备的各个灰阶的目标亮度值。
  16. 根据权利要求11所述的调整装置，其中，所述处理器还被配置为：
    在待调整灰阶的目标亮度值高于其初始亮度值的条件下，增加待调整灰阶的初始亮度值；
    在待调整灰阶的目标亮度值低于其初始亮度值的条件下，减小待调整灰阶的初始亮度值。
  17. 根据权利要求16所述的调整装置，其中，所述处理器还被配置为：通过增加或减小一灰阶的初始颜色分量值，增加或减小所述灰阶的初始亮度值。
  18. 根据权利要求17所述的调整装置，其中，所述初始颜色分量值是从所述显示设备读取的，所述处理器还被配置为：
    从所述显示设备的各个灰阶的初始亮度值中，选择与待调整灰阶的目标亮度值最接近的初始亮度值；以及
    将所选择的初始亮度值所对应的灰阶的初始颜色分量值用作所述待调整灰阶的初始颜色分量值。
  19. 根据权利要求18所述的调整装置，其中，所述处理器还被配置为：
    针对调整后的各个灰阶，判断调整后的初始亮度值是否满足预定条件，在调整后的初始亮度值不满足预定条件的情况下，再次执行调整，直至所有调整后的初始亮度值都满足预定条件为止。
  20. 根据权利要求19所述的调整装置，其中，所述预定条件为：
    Figure PCTCN2017116574-appb-100004
    其中，
    Figure PCTCN2017116574-appb-100005
    Figure PCTCN2017116574-appb-100006
    Ladjust(j)是第j个灰阶的调整后的初始亮度值，Ltarget(j)是第j个灰阶的目标亮度值，T(j)是第j个灰阶的灰度等级值，p是0到1之间的常数，其中，j＝1、2、…、N-1，N是显示设备的灰阶数量。
PCT/CN2017/116574 2017-05-12 2017-12-15 显示设备的亮度调整方法和调整装置 WO2018205616A1 (zh)

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