WO2017173863A1 - 伽马调制方法 - Google Patents

伽马调制方法 Download PDF

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Publication number
WO2017173863A1
WO2017173863A1 PCT/CN2017/000029 CN2017000029W WO2017173863A1 WO 2017173863 A1 WO2017173863 A1 WO 2017173863A1 CN 2017000029 W CN2017000029 W CN 2017000029W WO 2017173863 A1 WO2017173863 A1 WO 2017173863A1
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display panel
value
gray scale
brightness
gray
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PCT/CN2017/000029
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English (en)
French (fr)
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肖向春
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京东方科技集团股份有限公司
北京京东方多媒体科技有限公司
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Priority to US15/526,638 priority Critical patent/US10192521B2/en
Publication of WO2017173863A1 publication Critical patent/WO2017173863A1/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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • 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
    • G09G2320/0238—Improving the black level
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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  • the present invention aims to at least solve one of the technical problems existing in the prior art, and proposes a gamma modulation method which can ensure the difference in luminance between gray scales in a low gray level, thereby improving the low display panel after modulation.
  • the display effect of grayscale image information is not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to, a gamma modulation method, and proposes a gamma modulation method which can ensure the difference in luminance between gray scales in a low gray level, thereby improving the low display panel after modulation.
  • the display effect of grayscale image information is aims to at least solve one of the technical problems existing in the prior art, and proposes a gamma modulation method which can ensure the difference in luminance between gray scales in a low gray level, thereby improving the low display panel after modulation.
  • Measurement display panel minimum luminance value L min and maximum L max luminance value; wherein, the luminance value L min is the minimum luminance value in gray scale level 0, L max is the maximum luminance value of the luminance gray scale level n value;
  • the brightness of the display panel is modulated according to the measured minimum brightness value Lmin , the maximum brightness value Lmax , and the calculated brightness values from the first level gray scale to the (n-1)th gray scale.
  • the display panel has a gray level of 256 or 64.
  • the display panel is partially according to the visual perception of different users.
  • the brightness value under the gray scale is adaptively adjusted.
  • z is sequentially taken as an integer between 1 and (n-1) to calculate the gray scale of the display panel to the (n-1)th ) The brightness value under the gray level.
  • the position of the 0th gray scale and the nth gray scale of the display panel in the ideal Gamma curve is determined by detecting the minimum brightness value Lmin and the maximum brightness value Lmax of the display panel, and According to the position of the 0th gray scale and the nth gray scale in the ideal Gamma curve, the corresponding gray scale difference of the adjacent gray scale of the display panel in the ideal Gamma curve is calculated, so that the first gray scale can be calculated to the first The position of the (n-1)-level gray scale in the ideal Gamma curve, on the basis of which, according to the ideal Gamma curve, the brightness of the first-order gray scale to the (n-1)-th grade gray scale can be calculated; The detected luminance L min at the 0th gray scale, the calculated luminance from the first gray scale to the (n-1)th gray scale, and the detected luminance L max at the nth gray scale As a standard brightness value, it can be used to modulate the prepared display panel.
  • FIG. 1 is a schematic diagram of a Gamma curve used in performing Gamma modulation on a display panel in the prior art
  • FIG. 2 is a flow chart of a gamma modulation method according to an embodiment of the present invention.
  • FIG. 3 illustrates a Gamma curve used when performing gamma modulation on a display panel using a gamma modulation method according to an embodiment of the present invention, and shows a correspondence relationship with an ideal gamma curve;
  • FIG. 4 is a 256-level gray scale display panel directly using the existing ideal gamma curve for gamma modulation after gamma modulation and gamma modulation method according to an embodiment of the present invention after gamma modulation gray level A comparison table of brightness underneath.
  • FIG. 1 is a schematic diagram of a Gamma curve used in performing Gamma modulation on a display panel in the prior art.
  • the Gamma curve when the Gamma value (represented by m) is 2.2 is specifically shown in Fig. 1, and the Gamma curve can be expressed by the following formula (1):
  • L z represents the luminance under the z-th gray scale
  • z represents the number of gray scales
  • K is a constant determined by the display panel.
  • the Gamma curve represented by the above formula (1) is generally referred to as an ideal Gamma curve.
  • the brightness of the display panel is 0 at the 0th gray scale, and the brightness of the display panel is 255 m K at the 255th gray scale. .
  • the K value of the display panel is first calculated by detecting the maximum brightness value L max of the display panel, and using the maximum brightness value L max to calculate the specific value of K according to the following formula (2):
  • the brightness values of the display panel of the first to sixth gray scales can be calculated according to the above formula (1).
  • the brightness values of the display panel of the 0th gray scale to the 255th gray scale are obtained.
  • the brightness of the display panel from the 0th gray scale to the 255th gray scale is used as the standard brightness value, and the brightness of the prepared display panel is modulated according to the standard brightness value.
  • the brightness of the minimum gray scale of the prepared display panel is not zero, that is, it does not match the above standard brightness value.
  • the gamma modulation is still performed according to the ideal gamma curve shown in FIG. 1, the luminance difference between the gray levels in the low gray level is compressed, so that the modulated display panel cannot be clearly displayed. Image information at low gray levels.
  • Embodiments of the present invention provide a new gamma modulation method.
  • the gamma modulation method is used to modulate the brightness of the display panel, in particular, to modulate the display panel whose luminance value is not zero at the lowest gray level.
  • FIG. 2 is a flowchart of a gamma modulation method according to an embodiment of the present invention.
  • the gamma modulation method includes the following steps S1 to S5.
  • Figure 3 shows the use The gamma curve used in the Gamma modulation of the display panel according to the gamma modulation method of the embodiment of the present invention, and the correspondence relationship with the ideal gamma curve is also shown.
  • the Gamma curve used in the gamma modulation of the display panel by the gamma modulation method according to the embodiment of the present invention is the portion of the curve shown in FIG. 3 whose abscissa is in the range of [x, n], that is, ideal.
  • the portion of the Gamma curve whose abscissa is in the range of [x, n] (the ideal Gamma curve also includes the portion of the abscissa in the range of [0, x)).
  • step S1 the minimum brightness value Lmin and the maximum brightness value Lmax of the display panel are measured.
  • the luminance value L min is the minimum luminance value in gray scale level 0
  • the luminance value L max is the maximum luminance value in the gray scale level n.
  • step S1 the brightness of the display panel is adjusted to the lowest brightness, and the brightness is measured.
  • the measured brightness is the brightness value L min of the display panel under the 0th gray level; the brightness of the display panel is adjusted to the highest The brightness is measured, and the brightness measured at this time is the brightness value L max of the display panel under the nth gray level.
  • Step S2 according to the formula The value of the first intermediate parameter x is calculated.
  • m is the gamma value of the display panel.
  • the specific value may be 2.2.
  • the minimum brightness value L min ⁇ 0 detected in step S1 the lowest gray level of the display panel - the brightness value under the 0th level gray level is not 0, at this time, it cannot be directly according to FIG.
  • the ideal Gamma curve shows the gamma modulation on the display panel, otherwise there will be problems in the technology.
  • the minimum luminance value Lmin is equal to the luminance value of the display panel at the xth grayscale in the ideal Gamma curve
  • the following formula (3) can be obtained according to the above formula (1):
  • the maximum brightness value L max is the brightness value of the display panel at the highest gray level - the nth level gray scale, therefore, according to the above formula (1), the following formula (4) can be obtained:
  • the value of the first intermediate parameter x can be calculated according to the formula (5), so that the lowest gray level of the display panel can be known.
  • the brightness is equivalent to the brightness of the first level of gray in the ideal Gamma curve.
  • Step S3 according to the formula The value of the second intermediate parameter y is calculated.
  • the value of the first intermediate parameter x After calculating the value of the first intermediate parameter x, it means that the coordinates of the 0th gray scale and the nth gray scale of the display panel in the ideal Gamma coordinate system shown in FIG. 1 are obtained, and the 0th level is obtained. There is (n-1) gray scale between the gray scale and the nth gray scale, therefore, according to the corresponding position of the 0th gray scale and the nth gray scale in the ideal Gamma curve, and the 0th gray scale sum For the number of gray scales (n-1) between the nth gray scales, the gray scale difference corresponding to the adjacent two gray scales of the display panel in the coordinate system of the ideal Gamma curve can be calculated by the following formula (6).
  • the second intermediate parameter y is the corresponding gray level difference of the adjacent two gray scales of the display panel in the coordinate system of the ideal Gamma curve, so that the first level gray scale of the display panel can be obtained to the (n-1)
  • the gray level of each level in the gray level is equivalent to the first level gray level in the ideal Gamma curve.
  • the second intermediate parameter y ⁇ 0.9569 can be calculated according to the above formula (6), thereby obtaining that the brightness of the display panel under the gray level of the first level is equivalent to ideal.
  • Step S4 according to the formula or The luminance value L z under the z-th gray scale is calculated.
  • z is an integer between 1 and (n-1).
  • step S3 the brightness of the first stage gray scale to the (n-1)th gray scale of the display panel respectively corresponds to the brightness of the first level gray scale in the ideal Gamma curve, the display panel can be calculated.
  • the brightness value from the first level gray scale to the (n-1)th gray scale Specifically, according to the ideal gamma curve, the luminance value L z at the z-th gray scale has the following relationship with the maximum luminance value L max :
  • the display brightness can be calculated under the first panel grayscale value z L z.
  • the luminance value of the display panel in the first to sixth gray scales to the (n-1)th gray scale can be calculated.
  • the luminance value L z at the z-th gray scale has the following relationship with the minimum luminance value L min :
  • the luminance value L z under the z-th gray scale of the display panel can also be calculated.
  • the luminance value of the display panel in the first to sixth gray scales to the (n-1)th gray scale can be calculated.
  • calculated according to the equation (8) in the second luminance grayscale value z L z In the case of lines required before the minimum luminance value of L min ⁇ 0.
  • FIG. 4 is a table showing, in a tabular manner, a display panel having 256 gray scales directly using the existing ideal gamma curve for luminance under gray levels of gamma modulation and according to the present invention.
  • the Gamma modulation method of the embodiment performs a comparison between the luminances at the gray levels of each level after Gamma modulation.
  • the luminance value 2 is displayed after gamma modulation using the ideal Gamma curve directly.
  • the luminance values under the gray scales of the panel, and the luminance value 1 is the luminance values of the gray scales of the display panel after Gamma modulation according to the gamma modulation method of the embodiment of the present invention.
  • the brightness difference of the display panel under the second level gray level and the first level gray level is 0.010320914, and the display panel is in the third level gray.
  • the difference in brightness between the gray level of the order and the second level is 0.018997272, and the difference of the brightness of the display panel between the fourth level gray level and the third level gray level is 0.028425194.
  • the brightness difference of the display panel under the second-order gray level and the first-order gray level is 0.110600422, and the display panel is in the third-order gray level and the second-order gray level.
  • the difference in brightness is 0.122063831, and the difference in brightness between the 4th gray scale and the 3rd gray scale of the display panel is 0.133709738.
  • Step S5 according to the measured minimum brightness value Lmin , the maximum brightness value Lmax , and the calculated brightness values from the first level gray scale to the (n-1)th gray scale, the brightness of the display panel is performed. modulation.
  • step S5 the measured luminance value L min at the 0th gray scale, the luminance value L max at the nth gray scale, and the calculated first gray scale to the (n-1) gray
  • the brightness value under the order is used as a standard brightness value to modulate the prepared display panel.
  • step S4 after step S4, before step S5, the brightness value of the display panel under partial gray levels can be adaptively adjusted according to the visual experience of different users, and the gray scales of the display panel after the adjustment are adjusted accordingly.
  • the lower brightness value is used as a standard brightness value to modulate the prepared display panel.
  • the minimum luminance value L min and the maximum luminance value L max of the display panel are determined to determine that the 0th gray scale and the nth gray scale of the display panel are ideal.
  • the position in the Gamma curve, and according to the position of the 0th gray scale and the nth gray scale in the ideal Gamma curve, the corresponding gray scale difference of the adjacent gray scale of the display panel in the ideal Gamma curve is calculated, so that it can be calculated
  • the brightness L max under the gray scale is used as a standard brightness value, which can be used to modulate the prepared display panel.
  • the minimum brightness value L min ⁇ 0 of the display panel when the minimum brightness value L min ⁇ 0 of the display panel, the brightness difference under the low gray level of the display panel can be prevented from being compressed, and the brightness difference between the adjacent gray levels under the low gray level is further reduced. Large, thus ensuring the display of low grayscale image information.

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Abstract

一种伽马调制方法，包括：测量显示面板的最小亮度值Lmin和最大亮度值Lmax，其中，最小亮度值Lmin为第0级灰阶下的亮度值，最大亮度值Lmax为第n级灰阶下的亮度值（S1）；根据公式Lmin/L max=(x/n)∧m计算出第一中间参数x的数值，m为显示面板的伽马值（S2）；根据公式y=(n－x)/n计算出第二中间参数y的数值（S3）；根据公式Lz=[(x＋z×y) /n]∧m×Lmax计算第z级灰阶下的亮度值Lz，其中，z为1∼(n-1)之间的整数（S4）；根据测量到的最小亮度值Lmin、最大亮度值Lmax，以及计算出的第1级灰阶至第 (n-1) 级灰阶下的亮度值，对显示面板的亮度进行调制（S5）。

Description

伽马调制方法 技术领域
本发明涉及显示技术领域，具体地，涉及一种伽马调制方法。
背景技术
显示技术领域中，在完成显示面板的制备之后，需要根据预定的伽马(Gamma)曲线对各级灰阶下的亮度进行调制，使显示面板的各级灰阶所对应的亮度符合该预定的Gamma曲线，从而在显示图像时，保证显示面板能够对所述图像中不同亮度的细节内容进行准确地显示。
现有技术中，一般根据显示面板的理想Gamma曲线来对显示面板的各级灰阶下的亮度进行调制。但是，对于最小灰阶对应的亮度不为0的显示面板而言，直接使用理想Gamma曲线来进行Gamma调制可能出现低灰阶下各灰阶之间的亮度差被压缩的问题，从而使得调制后的显示面板无法清楚地显示低灰阶下的图像信息。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一，提出了一种Gamma调制方法，其可以保证低灰阶下各灰阶之间的亮度差异，从而改善调制后的显示面板对低灰阶图像信息的显示效果。
为实现本发明的目的而提供一种Gamma调制方法，其用以对显示面板的亮度进行调制，所述显示面板具有n+1级灰阶，其中，n为大于等于2的整数，所述Gamma调制方法包括：
测量显示面板的最小亮度值Lmin和最大亮度值Lmax；其中，所述最小亮度值Lmin为第0级灰阶下的亮度值，最大亮度值Lmax为第n 级灰阶下的亮度值；
根据公式
Figure PCTCN2017000029-appb-000001
计算出第一中间参数x的数值；其中，m为显示面板的Gamma值；
根据公式
Figure PCTCN2017000029-appb-000002
计算出第二中间参数y的数值；
根据公式
Figure PCTCN2017000029-appb-000003
或者
Figure PCTCN2017000029-appb-000004
计算第z级灰阶下的亮度值Lz；其中，z为1～(n－1)之间的整数；以及
根据所测量到的最小亮度值Lmin、最大亮度值Lmax，以及计算出的第1级灰阶至第(n－1)级灰阶下的亮度值，对显示面板的亮度进行调制。
优选地，所述显示面板的Gamma值m＝2.2。
优选地，所述显示面板的灰阶数为256或64。
优选地，在计算出的第1级灰阶至第(n－1)级灰阶下的亮度值之后，并且在对显示面板的亮度进行调制之前，根据不同用户的视觉感受对显示面板在部分灰阶下的亮度值作适应性调整。
优选地，在根据公式
Figure PCTCN2017000029-appb-000005
计算第z级灰阶下的亮度值Lz的步骤中，将z依次取在1～(n－1)之间的整数，以计算出显示面板在第1级灰阶至第(n－1)灰阶下的亮度值。
本发明具有以下有益效果：
本发明提供的Gamma调制方法中，通过检测显示面板的最小亮度值Lmin和最大亮度值Lmax以确定显示面板的第0级灰阶和第n级灰阶在理想Gamma曲线中的位置，并根据第0级灰阶和第n级灰阶在理想Gamma曲线中的位置计算出显示面板的相邻灰阶在理想Gamma曲线中对应的灰阶差，从而可以计算出第1级灰阶至第(n－1)级灰阶在理想Gamma曲线中的位置，在此基础上，根据所述理想Gamma曲线，可以计算出第1级灰阶至第(n－1)级灰阶下的亮度；将检测出的第0级灰阶下的亮度Lmin、计算出的第1级灰阶至第(n－1)级灰阶下的亮度、检测出的第n级灰阶下的亮度Lmax作 为标准亮度值，即可用于对制备完成的显示面板进行调制。与现有技术相比，在显示面板的最小亮度值Lmin≠0时，可以避免显示面板的低灰阶下的亮度差异被压缩，从而保证对低灰阶图像信息的显示效果。
附图说明
附图是用来提供对本发明的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本发明，但并不构成对本发明的限制。在附图中：
图1为现有技术中对显示面板进行Gamma调制时使用的Gamma曲线的示意图；
图2为根据本发明实施例的Gamma调制方法的流程图；
图3示出了利用根据本发明实施例的Gamma调制方法对显示面板进行Gamma调制时使用的Gamma曲线，同时示出了与理想Gamma曲线的对应关系；以及
图4为一种具有256级灰阶的显示面板直接使用现有的理想Gamma曲线进行Gamma调制后各级灰阶下的亮度以及依据本发明实施例的Gamma调制方法进行Gamma调制后各级灰阶下的亮度的对比表格。
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。
图1为现有技术中对显示面板进行Gamma调制时使用的Gamma曲线的示意图。图1中具体示出了Gamma值(由m表示)为2.2时的Gamma曲线，所述Gamma曲线可以用以下公式(1)表示：
Lz＝K×zm      (1)
其中，Lz表示第z级灰阶下的亮度，z表示灰阶的级数，K为由 显示面板决定的常数。上述公式(1)表示的Gamma曲线一般称为理想Gamma曲线。
以显示面板具有256级灰阶为例，根据图1所示的理想Gamma曲线，在第0级灰阶，显示面板的亮度为0，在第255级灰阶，显示面板的亮度为255mK。
在实际调制中，首先通过如下方法计算出显示面板的K值：检测显示面板的最大亮度值Lmax，利用该最大亮度值Lmax按照以下公式(2)计算出K的具体数值：
Lmax＝255mK     (2)
在获得K的具体数值之后，可以根据上述公式(1)分别计算出第1级灰阶至第254级灰阶下显示面板的亮度值。
由此，即获得了第0级灰阶至第255级灰阶下显示面板的亮度值。在显示面板的Gamma调制过程中，将该第0级灰阶至第255灰阶下显示面板的亮度作为标准亮度值，根据该标准亮度值对制备完成的显示面板的亮度进行调制。
但在实际中的很多情况下，制备出来的显示面板的最小灰阶下的亮度并不是0，也就是说，与上述标准亮度值并不相符。在此情况下，若仍根据上述图1所示的理想Gamma曲线进行Gamma调制，则会造成低灰阶下各灰阶之间的亮度差被压缩，从而使得调制后的显示面板无法清楚地显示低灰阶下的图像信息。
本发明实施例提供一种新的Gamma调制方法。所述Gamma调制方法用以对显示面板的亮度进行调制，特别是，针对最低灰阶下的亮度值不为0的显示面板进行调制。
在以下描述中，假设显示面板具有n+1级灰阶，其中n为大于等于2的整数。例如，当显示面板具有256级灰阶时，n＝255；或者当显示面板具有64级灰阶时，n＝631。
图2为根据本发明实施例的Gamma调制方法的流程图，如图2所示，所述Gamma调制方法包括以下步骤S1～S5。图3示出了利用 根据本发明实施例的Gamma调制方法对显示面板进行Gamma调制时使用的Gamma曲线，同时示出了与理想Gamma曲线的对应关系。如图3所示，利用根据本发明实施例的Gamma调制方法对显示面板进行Gamma调制时使用的Gamma曲线为图3所示曲线中横坐标在[x,n]范围内的部分，也即理想Gamma曲线中横坐标在[x,n]范围内的部分(理想Gamma曲线还包括横坐标在[0,x)范围内的部分)。
步骤S1，测量显示面板的最小亮度值Lmin和最大亮度值Lmax。其中，所述最小亮度值Lmin为第0级灰阶下的亮度值，最大亮度值Lmax为第n级灰阶下的亮度值。
在步骤S1中，将显示面板的亮度调整到最低亮度，测量其亮度，此时测量到的亮度即为显示面板在第0级灰阶下的亮度值Lmin；将显示面板的亮度调整到最高亮度，测量其亮度，此时测量到的亮度即为显示面板在第n级灰阶下的亮度值Lmax。
步骤S2，根据公式
Figure PCTCN2017000029-appb-000006
计算出第一中间参数x的数值。其中，m为显示面板的Gamma值，这里，假定显示面板的Gamma值m已知，其具体数值可以为2.2。
具体地，如果步骤S1中检测得到的最小亮度值Lmin≠0，则说明显示面板的最低灰阶——第0级灰阶下的亮度值不为0，此时，不能直接按照图1所示的理想Gamma曲线对显示面板进行Gamma调制，否则就会出现有技术中出现的问题。在此情况下，假设最小亮度值Lmin等于理想Gamma曲线中第x灰阶下的显示面板的亮度值，则根据上述公式(1)可以得出下述公式(3)：
Lmin＝K×xm    (3)
最大亮度值Lmax为显示面板在最高灰阶——第n级灰阶下的亮度值，因此，根据上述公式(1)可以得出下述公式(4)：
Lmax＝K×nm    (4)
结合公式(3)和公式(4)，可以得出下述公式(5):
Figure PCTCN2017000029-appb-000007
由于最小亮度值Lmin、最大亮度值Lmax、Gamma值以及n值均已知，因此根据公式(5)就可以计算出第一中间参数x的数值，从而可以获知显示面板的最低灰阶下的亮度相当于理想Gamma曲线中第多少级灰阶下的亮度。
需要说明的是，在步骤S1中测量得到的最小亮度值Lmin＝0时，也可以执行上述步骤S2；只不过在此情况下，所得出的x的数值会是0。
步骤S3，根据公式
Figure PCTCN2017000029-appb-000008
计算出第二中间参数y的数值。
在计算出第一中间参数x的数值之后，就意味着获得了显示面板的第0级灰阶和第n级灰阶在图1所示的理想Gamma曲线坐标系中的坐标，而第0级灰阶和第n级灰阶之间有(n－1)级灰阶，因此，根据第0级灰阶和第n级灰阶在理想Gamma曲线中对应的位置，以及第0级灰阶和第n级灰阶之间的灰阶数量(n－1)，可以通过下述公式(6)计算出显示面板的相邻两级灰阶在理想Gamma曲线的坐标系中对应的灰阶差。
Figure PCTCN2017000029-appb-000009
所述第二中间参数y即为显示面板的相邻两级灰阶在理想Gamma曲线的坐标系中对应的灰阶差，从而可以得出显示面板的第1级灰阶至第(n－1)级灰阶中的每一级灰阶相当于理想Gamma曲线中的第多少级灰阶。例如，假设n＝255，x＝11，按照上述公式(6)即可计算出第二中间参数y≈0.9569，由此可以得出所述显示面板在第1级灰阶下的亮度相当于理想Gamma曲线中第11.9569(＝(11+y))级灰阶下的亮度，所述显示面板在第2级灰阶下的亮度相当于理想Gamma曲线中第12.9137(＝(11+2y))级灰阶下的亮度，所述显示面板在第3级灰阶下的亮度相当于理想Gamma曲线中第13.8706(＝(11+3y))级灰阶下的亮度，所述显示面板在第4级灰 阶下的亮度相当于理想Gamma曲线中第14.8275(＝(11+4y))级灰阶下的亮度……所述显示面板在第254级灰阶下的亮度相当于理想Gamma曲线中第254.0431(＝(11+254y))级灰阶下的亮度。
步骤S4，根据公式
Figure PCTCN2017000029-appb-000010
或者
Figure PCTCN2017000029-appb-000011
计算第z级灰阶下的亮度值Lz。其中，z为1～(n－1)之间的整数。
在步骤S3中计算出显示面板的第1级灰阶至第(n－1)灰阶下的亮度分别相当于理想Gamma曲线中的第多少级灰阶下的亮度之后，可以计算出显示面板的第1级灰阶至第(n－1)灰阶下的亮度值。具体地，根据理想Gamma曲线，第z级灰阶下的亮度值Lz与最大亮度值Lmax之间具有以下关系：
Figure PCTCN2017000029-appb-000012
因此，根据上述公式(7)，可以计算出显示面板的第z级灰阶下的亮度值Lz。将z依次取在1～(n－1)之间的整数，可以计算出显示面板在第1级灰阶至第(n－1)灰阶下的亮度值。
另外，根据理想Gamma曲线，第z级灰阶下的亮度值Lz与最小亮度值Lmin之间具有以下关系：
Figure PCTCN2017000029-appb-000013
根据上述公式(8)，也可以计算出显示面板的第z级灰阶下的亮度值Lz。将z依次取在1～(n－1)之间的整数，可以计算出显示面板在第1级灰阶至第(n－1)灰阶下的亮度值。但需要说明的是，根据公式(8)计算第z级灰阶下的亮度值Lz需要在最小亮度值Lmin≠0的情况下才可行。
具体地，可以参看图4，图4以表格的方式示出了一种具有256级灰阶的显示面板直接使用现有的理想Gamma曲线进行Gamma调制后各级灰阶下的亮度以及依据本发明实施例的Gamma调制方法进行Gamma调制后各级灰阶下的亮度之间的对比。在图4所示的表格中，亮度值2为直接使用理想Gamma曲线进行Gamma调制后显示 面板的各级灰阶下的亮度值，而亮度值1则为根据本发明实施例的Gamma调制方法进行Gamma调制后显示面板的各级灰阶下的亮度值。对比亮度值1和亮度值2，直接使用现有的理想Gamma曲线进行Gamma调制后，显示面板在第2级灰阶与第1级灰阶下的亮度差为0.010320914，显示面板在第3级灰阶与第2级灰阶下的亮度差为0.018997272，显示面板在第4级灰阶与第3级灰阶下的亮度差为0.028425194……。而根据本发明实施例的Gamma调制方法进行Gamma调制后，显示面板在第2级灰阶与第1级灰阶下的亮度差为0.110600422，显示面板在第3级灰阶与第2级灰阶下的亮度差为0.122063831，显示面板在第4级灰阶与第3级灰阶下的亮度差为0.133709738……。可以看出，根据本发明实施例的Gamma调制方法进行Gamma调制的显示面板在低灰阶下，相邻灰阶之间的亮度差更大，这样就能更清楚的显示低灰阶下的图像信息。
步骤S5，根据所测量出的最小亮度值Lmin、最大亮度值Lmax，以及计算出的第1级灰阶至第(n－1)级灰阶下的亮度值，对显示面板的亮度进行调制。
在步骤S5中，以测量出的第0级灰阶下的亮度值Lmin、第n级灰阶下的亮度值Lmax，以及计算出的第1级灰阶至第(n－1)灰阶下的亮度值作为标准亮度值，对制备完成的显示面板进行调制。
在实际应用中，在步骤S4之后，步骤S5之前，还可以根据不同用户的视觉感受对显示面板在部分灰阶下的亮度值作适应性调整，并以此调整之后的显示面板的各灰阶下的亮度值作为标准亮度值，对制备完成的显示面板进行调制。
综上所述，本发明实施例提供的Gamma调制方法中，通过检测显示面板的最小亮度值Lmin和最大亮度值Lmax以确定显示面板的第0级灰阶和第n级灰阶在理想Gamma曲线中的位置，并根据第0级灰阶和第n级灰阶在理想Gamma曲线中的位置计算出显示面板的相邻灰阶在理想Gamma曲线中对应的灰阶差，从而可以计算出第1级灰 阶至第(n－1)级灰阶在理想Gamma曲线中的位置，在此基础上，根据所述理想Gamma曲线，可以计算出第1级灰阶至第(n－1)级灰阶下的亮度；将检测出的第0级灰阶下的亮度Lmin、计算出的第1级灰阶至第(n－1)级灰阶下的亮度、检测出的第n级灰阶下的亮度Lmax作为标准亮度值，即可用于对制备完成的显示面板进行调制。与现有技术相比，在显示面板的最小亮度值Lmin≠0时，可以避免显示面板的低灰阶下的亮度差异被压缩，使低灰阶下相邻灰阶之间的亮度差更大，从而保证对低灰阶图像信息的显示效果。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (5)

  1. 一种伽马调制方法，用以对显示面板的亮度进行调制，所述显示面板具有n+1级灰阶，其中，n为大于等于2的整数，其特征在于，所述伽马调制方法包括：
    测量显示面板的最小亮度值Lmin和最大亮度值Lmax；其中，所述最小亮度值Lmin为第0级灰阶下的亮度值，最大亮度值Lmax为第n级灰阶下的亮度值；
    根据公式
    Figure PCTCN2017000029-appb-100001
    计算出第一中间参数x的数值；其中，m为显示面板的伽马值；
    根据公式
    Figure PCTCN2017000029-appb-100002
    计算出第二中间参数y的数值；
    根据公式
    Figure PCTCN2017000029-appb-100003
    计算第z级灰阶下的亮度值Lz；其中，z为1～(n－1)之间的整数；以及
    根据所测量到的最小亮度值Lmin、最大亮度值Lmax，以及计算出的第1级灰阶至第(n－1)级灰阶下的亮度值，对显示面板的亮度进行调制。
  2. 根据权利要求1所述的伽马调制方法，其特征在于，所述显示面板的伽马值m＝2.2。
  3. 根据权利要求1所述的伽马调制方法，其特征在于，所述显示面板的灰阶数为256或64。
  4. 根据权利要求1所述的伽马调制方法，其特征在于，在计算出第1级灰阶至第(n－1)级灰阶下的亮度值之后，并且在对显示面板的亮度进行调制之前，根据不同用户的视觉感受对显示面板在部分灰阶下的亮度值作适应性调整。
  5. 根据权利要求1所述的伽马调制方法，其特征在于，在根据公式
    Figure PCTCN2017000029-appb-100004
    计算第z级灰阶下的亮度值Lz的步骤中，将z依次取在1～(n－1)之间的整数，以计算出显示面板在第1级灰阶至第(n－1)灰阶下的亮度值。
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