CN111081188B - Gamma correction parameter calculation method for AMOLED display system - Google Patents
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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
- G09G3/22—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]
- G09G3/3225—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] using an active matrix
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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
- 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
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Abstract
The invention relates to the field of display systems, and discloses a method for calculating gamma correction parameters of an AMOLED display system, which comprises the following steps: A) acquiring a gamma correction table LUTG0 of normal display brightness Lv 0; B) fitting to obtain a continuous gamma correction function; a') setting the maximum brightness value Lv1 corresponding to the gamma correction table to be calculated, and Lv1< Lv 0; b') obtaining a coefficient k for calculating a new binding point value; c ') generating a new binding point value X', executing the step C); C) calculating a corresponding correction value Y 'according to the new binding point value X'; D) a gamma correction table LUTG1 with lower display brightness Lv1 is generated. The method for calculating the gamma correction parameters of the AMOLED display system has the following beneficial effects: on the basis of meeting the gamma characteristic of the AMOLED display system, more time can be saved.
Description
Technical Field
The invention relates to the field of display systems, in particular to a method for calculating gamma correction parameters of an AMOLED display system.
Background
Fig. 1 is a schematic structural diagram of an AMOLED (active Matrix Organic Light Emitting diode) display system, which is mainly composed of a driving IC and an AMOLED display screen, and has a relatively fixed relationship between displayed brightness and an input digital signal, which is generally recognized in the art as gamma 2.2. However, the relationship between the luminance and the voltage of the OLED is not gamma2.2, and gamma correction is required in the driving IC to achieve the required gamma characteristics of the AMOLED display system. And the setting of gamma correction parameters in the drive IC needs to be realized by a gamma calibration system: for a certain input gray scale, the gamma correction parameters of the drive IC are set to enable the output brightness of the AMOLED display system to reach the required brightness, and the gamma correction parameters of each input gray scale are sequentially calibrated. Obtaining gamma correction parameters by gamma calibration of the system takes a relatively long time. Some gray scales are generally selected for calibration, and the other non-calibrated gray scales need to be obtained by calculation using the calibration parameters of the adjacent calibrated gray scales. An AMOLED display system usually requires multiple gamma correction parameters corresponding to different brightness levels. In the traditional method, a gamma calibration system is used for obtaining a plurality of groups of gamma correction parameters corresponding to different brightness, but a lot of time is needed, and the cost of the AMOLED display system is increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for calculating gamma correction parameters of an AMOLED display system, which can save more time on the basis of satisfying the gamma characteristics of the AMOLED display system, in order to solve the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for calculating gamma correction parameters of an AMOLED display system is constructed, and the method comprises the following steps:
A) acquiring a gamma correction table LUTG0 of normal maximum display brightness Lv 0;
B) fitting to obtain a continuous gamma correction function;
a') setting the maximum brightness value Lv1 corresponding to the gamma correction table to be calculated, and Lv1< Lv 0;
b') obtaining a coefficient k for calculating a new binding point value;
c ') generating a new binding point value X', executing the step C);
C) calculating a corresponding correction value Y 'according to the new binding point value X';
D) a gamma correction table LUTG1 with lower display brightness Lv1 is generated.
In the method for calculating gamma correction parameters of the AMOLED display system, the step a) further includes:
A1) for a certain input gray scale, setting gamma correction parameters of a drive IC to enable the output brightness of the AMOLED display system to reach the required brightness;
A2) sequentially calibrating gamma correction parameters of each input gray scale;
A3) obtaining a gamma correction table LUTG0, LUTG0: Y [ Y ] corresponding to the normal maximum display brightness Lv0 through a gamma calibration system0,y1,y2...yn]＝[f(x0),f(x1),f(x2)...f(xn)]Wherein X ═ X0,x1,x2...xn]For binding point value, Y ═ Y0,y1,y2...yn]Is the corresponding output value.
In the method for calculating the gamma correction parameters of the AMOLED display system, in the step B), according to the gamma correction table LUTG0 of the normal maximum display brightness Lv0, a fitting method is adopted for fitting to obtain a continuous gamma correction function.
In the method for calculating the gamma correction parameters of the AMOLED display system, the fitting method is linear interpolation or spline interpolation.
In the method for calculating the gamma correction parameters of the AMOLED display system, when the fitting method is linear interpolation, for any input value x, the corresponding output values y are obtained, and the relationship between y and x is as follows:
in the method for calculating the gamma correction parameter of the AMOLED display system, the coefficient k is specifically as follows:
wherein G is a set value and has a size of 1.0, 1.8, 2.0, 2.2 or 2.4.
In the method for calculating the gamma correction parameter of the AMOLED display system, the new binding point value X' is specifically as follows:
X′＝k×X＝k×[x0,x1,x2...xn]＝[kx0,kx1,kx2...kxn]。
in the method for calculating gamma correction parameters of the AMOLED display system according to the present invention, in the step C), the gamma correction function is used to calculate the correction value Y ', where Y ═ Y'0,y′1,y′2...y′n]＝[f(kx0),f(kx1),f(kx2)...f(kxn)]。
In the method for calculating the gamma correction parameter of the AMOLED display system, the gamma correction table LUTG1 of the lower display brightness Lv1 is specifically as follows:
LUTG1:Y′＝[y′0,y′1,y′2...y′n]＝[f′(x0),f′(x1),f′(x2)...f′(xn)]
wherein X ═ X0,x1,x2...xn]Is binding value, Y ═ Y'0,y′1,y′2...y′n]Is the corresponding output value.
The method for calculating the gamma correction parameters of the AMOLED display system has the following beneficial effects: because the gamma correction table with lower brightness is obtained by using the calculation method, the AMOLED display system can keep better gamma characteristics under each display brightness, and compared with a method for obtaining a plurality of groups of gamma correction tables with lower brightness by calibrating the system, the method can save more time on the basis of meeting the gamma characteristics of the AMOLED display system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an AMOLED display system;
FIG. 2 is a flowchart illustrating a gamma correction parameter calculation method for an AMOLED display system according to the present invention;
FIG. 3 is a flowchart illustrating a gamma correction table LUTG0 for obtaining the normal maximum display brightness Lv0 according to the embodiment;
fig. 4 is a relative relationship diagram of LUTG0 and LUTG1 at a certain setting in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the method for calculating the gamma correction parameter of the AMOLED display system of the present invention, a flowchart of the method for calculating the gamma correction parameter of the AMOLED display system is shown in fig. 2. In fig. 2, the method for calculating the gamma correction parameter of the AMOLED display system includes the following steps:
step S01 acquires gamma correction table LUTG0 of normal maximum display luminance Lv 0: in this step, a gamma correction table LUTG0 of normal maximum display luminance Lv0 is obtained.
For the present embodiment, the step S01 may be further refined, and the detailed flowchart thereof is shown in fig. 3. In fig. 3, the step S01 further includes the following steps:
in step S11, for one input gray scale, the gamma correction parameter of the driving IC is set so that the output brightness of the AMOLED display system reaches the required brightness: in this step, the setting of gamma correction parameters in the driver IC needs to be implemented by the gamma calibration system: for a certain input gray scale, the gamma correction parameter of the drive IC is set to enable the output brightness of the AMOLED display system to reach the required brightness.
Step S12 sequentially calibrates gamma correction parameters of each input gray level: in this step, gamma correction parameters of each input gray scale are sequentially calibrated.
Step S13 is to obtain a gamma correction table LUTG0 corresponding to the normal maximum display brightness Lv0 through a gamma calibration system: in the step, a gamma correction table LUTG0 corresponding to the normal maximum display brightness Lv0 is obtained through a gamma calibration system,
LUTG0:Y＝[y0,y1,y2...yn]＝[f(x0),f(x1),f(x2)...f(xn)]
wherein X ═ X0,x1,x2...xn]For binding point value, Y ═ Y0,y1,y2...yn]Is the corresponding output value.
Step S02 fitting to obtain a continuous gamma correction function: in the step, according to a gamma correction table LUTG0 of the normal maximum display brightness Lv0, a fitting method is adopted for fitting to obtain a continuous gamma correction function. The fitting method may be linear interpolation or spline interpolation, etc. Here, for an arbitrary input value x, the relationship between the corresponding output values y, y and x can be obtained as follows:
step S01' sets the maximum brightness value Lv1 corresponding to the gamma correction table to be calculated, and Lv1< Lv 0: in this step, the maximum brightness value Lv1 corresponding to the gamma correction table to be calculated is set, and Lv1< Lv 0.
Step S02' acquires a coefficient k for calculating a new binding point value: in this step, a coefficient k for calculating a new tie value is obtained, and if the gamma characteristic of the AMOLED display system is gamma G, where G may be a set value such as 1.0, 1.8, 2.0, 2.2, or 2.4, and currently accepted in the industry as 2.2, the coefficient k is specifically as follows:
step S03 'generates a new binding point value X': in this step, the coefficient k is multiplied by the tie value X of LUTG0 ═ X0,x1,x2...xn]Generating a new binding point value X ', wherein the new binding point value X' is specifically as follows:
X′＝k×X＝k×[x0,x1,x2...xn]＝[kx0,kx1,kx2...kxn]；
after the present step is executed, step S03 is executed.
Step S03 calculates a corresponding corrective value Y 'based on the new binding point value X': in this step, a continuous gamma correction function is obtained by fitting, and a correction value Y '═ Y' corresponding to the new binding point value X 'is calculated'0,y′1,y′2...y′n]＝[f(kx0),f(kx1),f(kx2)...f(kxn)]。
Step S04 generates a gamma correction table LUTG1 of lower display luminance Lv 1: in this step, based on the correction value Y' obtained in the foregoing, a gamma correction table LUTG1 of a lower display luminance Lv1 can be generated, and the gamma correction table LUTG1 of the lower display luminance Lv1 is specifically as follows:
LUTG1:Y′＝[y′0,y′1,y′2...y′n]＝[f′(x0),f′(x1),f′(x2)...f′(xn)]
wherein X ═ X0,x1,x2...xn]Is binding value, Y ═ Y'0,y′1,y′2...y′n]Is the corresponding output value.
Fig. 4 is a relative relationship diagram of LUTG0 and LUTG1 at a certain setting in the present embodiment.
In summary, in this embodiment, since the gamma correction tables with lower brightness are obtained by using the calculation method, the AMOLED display system can maintain better gamma characteristics at each display brightness, and compared with a method for obtaining a plurality of sets of gamma correction tables with lower brightness by calibrating the system, the method provided by the invention can save more time on the basis of meeting the gamma characteristics of the AMOLED display system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A gamma correction parameter calculation method for an AMOLED display system is characterized by comprising the following steps:
A) acquiring a gamma correction table LUTG0 of normal maximum display brightness Lv 0;
B) fitting to obtain a continuous gamma correction function;
a') setting the maximum brightness value Lv1 corresponding to the gamma correction table to be calculated, and Lv1< Lv 0;
b') obtaining a coefficient k for calculating a new binding point value;
c ') generating a new binding point value X', executing the step C);
C) calculating a corresponding correction value Y 'according to the new binding point value X';
D) generating a gamma correction table LUTG1 with lower display brightness Lv 1;
the step A) further comprises the following steps:
A1) for a certain input gray scale, setting gamma correction parameters of a drive IC to enable the output brightness of the AMOLED display system to reach the required brightness;
A2) sequentially calibrating gamma correction parameters of each input gray scale;
A3) obtaining a gamma correction table LUTG0, LUTG0: Y [ Y ] corresponding to the normal maximum display brightness Lv0 through a gamma calibration system0,y1,y2...yn]＝[f(x0),f(x1),f(x2)...f(xn)]Wherein X ═ X0,x1,x2...xn]For binding point value, Y ═ Y0,y1,y2...yn]Is the corresponding output value;
the coefficient k is specifically as follows:
wherein G is a set value and has a size of 1.0, 1.8, 2.0, 2.2 or 2.4;
the new binding point value X' is specifically as follows:
X′＝k×X＝k×[x0,x1,x2...xn]＝[kx0,kx1,kx2...kxn]；
in the step C), the gamma correction function is used to calculate the correction value Y', where Y ═ Y0′,y1′,y2′...yn′]＝[f(kx0),f(kx1),f(kx2)...f(kxn)]。
2. The method for calculating gamma correction parameters of the AMOLED display system as claimed in claim 1, wherein in the step B), the continuous gamma correction function is obtained by fitting according to a gamma correction table LUTG0 of the normal maximum display brightness Lv0 by using a fitting method.
3. The method for calculating gamma correction parameters of the AMOLED display system as recited in claim 2, wherein the fitting method is linear interpolation or spline interpolation.
4. The method of calculating gamma correction parameters for an AMOLED display system as claimed in claim 3, wherein when the fitting method is linear interpolation, for any input value x, the corresponding output values y, y and x have the following relationship:
5. the method of calculating gamma correction parameters for an AMOLED display system as set forth in claim 1, wherein the gamma correction table LUTG1 for the lower display brightness Lv1 is as follows:
LUTG1:Y′＝[y0′,y1′,y2′...yn′]＝[f′(x0),f′(x1),f′(x2)...f′(xn)]
wherein X ═ X0,x1,x2...xn]For binding values, Y ═ Y0′,y1′,y2′...yn′]Is the corresponding output value.
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Address after: Room 1905, building 4, No. 209, Zhuyuan Road, high tech Zone, Suzhou City, Jiangsu Province 215000 Patentee after: Sunrise Microelectronics (Suzhou) Co.,Ltd. Address before: Room 1905, building 4, No. 209, Zhuyuan Road, high tech Zone, Suzhou City, Jiangsu Province 215000 Patentee before: Sheng Microelectronics (Suzhou) Co.,Ltd. |
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