CN112071264B - Gamma correction method and device - Google Patents
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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, and provides a gamma correction method and a gamma correction device, which can determine a group of characteristic gray scale points according to the type of a display panel, wherein the characteristic gray scale points are discrete points of a gamma curve; storing the group of characteristic gray scale points in a register; and performing gray scale correction on the image data of the display panel according to the characteristic gray scale points. Compared with the prior art that binding point gray scales (characteristic gray scale points) at fixed positions are selected and only one type of display panel is tested and corrected, the gamma correction method and the gamma correction device provided by the invention can flexibly select one group of characteristic gray scale points according to the type of the display panel, can be compatible with correction work of different display panel types while realizing gamma correction, not only ensures the display effect, but also effectively saves the test cost and improves the production efficiency.
Description
Technical Field
The invention relates to the field of display, in particular to a gamma correction method and a gamma correction device.
Background
In the related art, the brightness perceived by human eyes is not linearly related to the actual display brightness of the display panel. In low brightness environments, the human eye is more sensitive to changes in brightness, and in high brightness environments, the other way around. This characteristic of the human eye is called Gamma (Gamma) characteristic. Due to the non-linear perception of brightness by human eyes, if we need to obtain a uniformly changing brightness perception, the brightness displayed by the display panel needs to be adjusted to adapt to the Gamma characteristic of human eyes. The non-linear parameter of the brightness and the gray scale degree of the display panel can be called as a Gamma parameter, and a curve drawn according to the Gamma parameter is called as a Gamma curve. The Gamma parameter describes the non-linear relationship between the brightness and the gray scale, i.e. the non-linear relationship between the brightness and the input voltage of the data line. Therefore, if the luminance of the display panel and the input voltage of the data line do not conform to the above-mentioned Gamma curve, Gamma correction is required to be performed on the display panel.
The development of Display technology is on the rise, and one of the development directions of Liquid Crystal Display (LCD) or Active-matrix organic light emitting diode (AMOLED) displays is large-size and high-Display image quality, but due to the deficiencies in the aspects of Display panel design, manufacturing process and the like, the problem of voltage drop of the Display has more serious influence on the Display quality, and the problem is particularly prominent in the application of large-size panels.
Taking an AMOLED display screen as an example, a current-type driver is adopted, and a working point of a driving thin film transistor of the AMOLED display screen is located in a linear region of a transfer characteristic, and a working voltage range is narrow, so that the AMOLED is very sensitive to a change of a data voltage, and a difference as small as several millivolts is reflected on a display effect.
The gamma correction performed by the current display driving chip before image output generally includes analog gamma and digital gamma, and at present, 27 or 13 gamma binding gray scales are usually set in the digital gamma of the driving chip of the high-resolution display panel. If the digital gamma method is adopted, the positions of 27 gamma binding point gray scales are fixed, and the method can only be used for processing one display panel type and has poor effect when being used for other display panel types.
In addition, when the current AMOLED product performs gamma voltage correction, the initial adjustment value of the register corresponding to the driving voltage of the rgb pixels is preset. When the display panel performs Gamma correction, the Gamma correction is performed from an initial value to a target value. However, due to process errors in the product manufacturing process, the uniformity of the product inevitably has a certain degree of deviation, so the initial values required by the product are different, the fixed initial values cannot meet the actual production requirements, and meanwhile, each binding point gray scale often needs to be adjusted for many times, so the time for gamma correction is long, and the production efficiency is affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a gamma correction method and a gamma correction device, which can perform gamma correction and are compatible with different display panel types, thereby effectively saving the test cost and improving the production efficiency.
In one aspect, the present invention provides a gamma correction method, including:
determining a group of characteristic gray scale points according to the type of the display panel, wherein the characteristic gray scale points are discrete points of a gamma curve;
storing the set of characteristic gray scale points in a register; and
and performing gray scale correction on the image data of the display panel according to the characteristic gray scale points.
Preferably, a gray-scale difference value between any adjacent two of the determined set of characteristic gray-scale points is a power of 2.
Preferably, the determining a set of characteristic gray-scale points according to the type of the display panel comprises:
and determining a gamma curve according to the type of the display panel, wherein the gamma curve comprises a group of characteristic gray scale points corresponding to the type of the display panel.
Preferably, the performing gray-scale correction on the image data of the display panel according to the set of characteristic gray-scale points includes:
determining the configuration parameters of the register corresponding to each characteristic gray scale point according to the gamma curve;
adjusting the parameters of each characteristic gray scale point according to the configuration parameters of the register;
adjusting the parameters of each gray scale on the gamma curve according to the adjusted parameters of each characteristic gray scale point,
the image data of the display panel comprises parameters of each gray scale on the gamma curve.
Preferably, the different types of display panels are corresponding to gamma curves comprising a set of the characteristic gray scale points, and the positions of the characteristic gray scale points on the different gamma curves are different.
Preferably, the display panel is one selected from an N-type display panel and a P-type display panel.
Preferably, in the gamma curve corresponding to the N-type display panel, the slope of the low gray scale range is smaller than the slope of the high gray scale range.
Preferably, in the gamma curve corresponding to the N-type display panel, the interval of the characteristic gray scale points in the low gray scale range is smaller than the interval in the high gray scale range.
Preferably, in the gamma curve corresponding to the P-type display panel, the slope of the low gray scale range is greater than the slope of the high gray scale range.
Preferably, in the gamma curve corresponding to the P-type display panel, the interval of the characteristic gray scale points in the low gray scale range is greater than the interval in the high gray scale range.
Preferably, the adjusting the parameter of each characteristic gray-scale point according to the configuration parameter of the register includes:
acquiring the current parameter of a register corresponding to each characteristic gray-scale point;
comparing the current parameter with the configuration parameter of the corresponding register;
when the current parameter is inconsistent with the configuration parameter, the current parameter is adjusted according to the configuration parameter.
In another aspect, the present invention provides a gamma correction device, which is connected to a display panel and a display driver chip, wherein the gamma correction device includes:
the driving module is connected with the display panel and the display driving chip and used for providing power supply and control signals for the display panel and the display driving chip;
the correction control module is respectively connected with the driving module and the display panel and is used for:
determining a group of characteristic gray scale points according to the type of the display panel, and sending the group of characteristic gray scale points to the display driving chip through the driving module, wherein the group of characteristic gray scale points are discrete points of a gamma curve;
storing the characteristic gray scale points in a register; and
and controlling the display driving chip to carry out gray scale correction on the image data of the display panel according to the characteristic gray scale points.
Preferably, the gamma correction apparatus further comprises:
a storage module connected to the driving module and the correction control module respectively for storing the gamma curve corresponding to the display panel type and the configuration parameters of the registers corresponding to the set of characteristic gray-scale points to the display driving chip,
the memory is arranged in the display driving chip.
Preferably, the correction control module includes:
the acquisition unit is used for acquiring the type of the display panel;
the selection unit is connected with the acquisition unit and used for determining a gamma curve comprising a group of characteristic gray scale points according to the type of the display panel;
the determining unit is connected with the selecting unit and used for determining the configuration parameters of the register corresponding to each characteristic gray scale point according to the gamma curve;
an adjusting unit respectively connected with the selecting unit and the determining unit and used for adjusting the parameters of each characteristic gray-scale point according to the configuration parameters of the register and adjusting the parameters of each gray scale on the gamma curve according to the adjusted parameters of each characteristic gray-scale point,
the image data of the display panel comprises parameters of each gray scale on the gamma curve.
Preferably, the gamma correction apparatus further comprises:
a detection module connected with the display driving chip and used for detecting the comparison between the current parameter of the register corresponding to each characteristic gray-scale point and the configuration parameter and judging whether the current parameter is consistent with the configuration parameter, if the current parameter is not consistent with the configuration parameter, the detection module outputs an invalid detection signal,
the gamma correction device executes the gamma correction method according to the invalid detection signal and performs cyclic detection until the detection module outputs a valid detection signal,
the parameter of the register corresponding to each characteristic gray scale point after the effective detection signal representation adjustment is consistent with the configuration parameter.
The invention has the beneficial effects that: the gamma correction method and the gamma correction device provided by the invention can determine a group of characteristic gray scale points according to the type of the display panel, wherein the characteristic gray scale points are discrete points of a gamma curve; storing the group of characteristic gray scale points in a register; and performing gray scale correction on the image data of the display panel according to the characteristic gray scale points. Compared with the prior art that binding point gray scales (characteristic gray scale points) with fixed positions are selected and only one type of display panel is tested and corrected, the gamma correction method and the gamma correction device provided by the invention can flexibly select one group of characteristic gray scale points according to the type of the display panel, can be compatible with correction work of different types of display panels while realizing gamma correction, not only ensures the display effect, but also effectively saves the test cost and improves the production efficiency.
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The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a flow chart of a gamma correction method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the distribution of three adjacent characteristic gray-scale points according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a distribution curve of a set of characteristic gray scale points in an implementation manner corresponding to an N-type display panel according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a distribution curve of a set of characteristic gray scale points in an embodiment of a P-type display panel according to the invention;
FIG. 5 is a schematic diagram of a gamma correction apparatus according to an embodiment of the present invention;
fig. 6 shows a schematic diagram of the structure of the calibration control module in fig. 5.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the related art, the non-linear parameter of the brightness and the gray scale degree of the display panel is called a Gamma parameter, and a curve drawn according to the Gamma parameter is called a Gamma curve. The Gamma parameter describes the non-linear relationship between the brightness and the gray scale, i.e. the non-linear relationship between the brightness and the input voltage of the data line. Therefore, if the luminance of the display panel and the input voltage of the data line do not conform to the above-mentioned Gamma curve, Gamma correction is required to be performed on the display panel.
Generally, the display effect of the display panel is different when the display panel outputs images due to the difference caused by the production process, and therefore, optical parameters of each produced display panel need to be adjusted, that is, gray level binding points (gray levels on a determined gamma curve, also called binding point gray levels) are adjusted according to the characteristics of a corresponding driver chip (IC) when each display panel is tested.
The gamma correction performed before image output currently includes two types, i.e., analog gamma and digital gamma, and currently, a high-resolution display panel usually has 27 or 13 gamma binding gray levels set in the digital gamma. If the digital gamma method is adopted, the positions of 27 gamma binding point gray scales (taking 27 as an example) on the gamma curve are fixed, the method is only suitable for processing one display panel type, and the display effect of the corrected display panel is poor when the method is used for other display panel types.
In summary, in order to achieve gamma correction and enable displays with different display panel types to obtain good display effects, the gamma correction method and device provided in the embodiments of the present invention are provided, so that the gamma correction is ensured to be completed before an image is output, and simultaneously, the same driver chip can be adapted to test and correct different display panel types by flexibly adjusting the positions of a group of characteristic gray-scale points on a gamma curve (the group of characteristic gray-scale points is discrete points determined from a plurality of binding point gray-scales on the corresponding gamma curve according to the display panel types), thereby saving test cost and improving production efficiency.
The present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart illustrating a gamma correction method according to an embodiment of the present invention.
In one aspect, an embodiment of the present invention provides a gamma correction method, which can be applied to a display panel test before leaving a factory, as shown in fig. 1, and includes:
step S110: a gamma curve including a set of characteristic gray scale points is determined according to the type of the display panel.
In step S110, a gamma curve is determined according to the display panel type, the gamma curve includes a set of characteristic gray-scale points corresponding to the display panel type, and the characteristic gray-scale points are discrete points of the gamma curve.
Furthermore, different display panel types are corresponding to gamma curves comprising a group of the characteristic gray scale points, and the positions of the characteristic gray scale points on different gamma curves are different. Specifically, taking the AMOLED display as an example, for example, the AMOLED display can be simply divided into an N-type display panel and a P-type display panel according to the type of the semiconductor material formed on the display panel (which is only an exemplary classification, but can be implemented by other classification easily conceived by those skilled in the art, and is not limited herein), in order to achieve a good display effect, for a set of characteristic gray-scale points in the gamma curve of the N-type display panel, the interval in the low gray-scale range needs to be smaller than the interval in the high gray-scale range, that is, in the corresponding gamma curve, the slope of the low gray-scale range is smaller than the slope of the high gray-scale range, as shown in fig. 3; in contrast, for a set of characteristic gray scale points in a gamma curve of a P-type display panel, the interval in the low gray scale range is larger than the interval in the high gray scale range, i.e., the slope of the low gray scale range in the corresponding gamma curve is larger than the slope of the high gray scale range, as shown in fig. 4.
In this embodiment, for example, a set list including a corresponding set of characteristic gray-scale points is mapped corresponding to each panel type. During operation, a set of corresponding characteristic gray scale points is determined according to the type of the display panel, and the step is executed, or a set of characteristic gray scale points corresponding to a certain type of the display panel can be adjusted in gray scale position according to the historical correction data, which is not limited herein. Therefore, the positions of the characteristic gray scale points on the corresponding gamma curve are determined corresponding to different display panel types, so that the gamma correction is ensured to be completed before the display driving chip outputs images to a screen, and meanwhile, the purpose that the same driving chip can be suitable for different display panel types is achieved through the flexible and adjustable positions of the characteristic gray scale points on the gamma curve.
Further, gray-scale difference values between any two adjacent characteristic gray-scale points in the determined set of characteristic gray-scale points are both powers of 2.
Referring to FIG. 2, FIG. 2 shows three adjacent characteristic gray-scale points X (n-1), X (n) and X (n +1), and for a certain characteristic gray-scale point X (n), two adjacent characteristic gray-scale points are respectively denoted as X (n-1) and X (n + 1). Different from the traditional digital gamma correction mode in which the input gray scale positions of X (n-1), X (n) and X (n +1) are fixed, the output gray scale positions are adjustable, and the input gray scale positions of the three adjacent characteristic gray scale points X (n-1), X (n) and X (n +1) in the embodiment can also be adjusted. It is only necessary to ensure that the difference in input gray levels between X (n-1) and X (n) is a power of 2, and that the difference in input gray levels between X (n) and X (n +1) is likewise a power of 2.
Step S120: and determining the configuration parameters of the register corresponding to each characteristic gray scale point according to the gamma curve.
In step S120, a certain number of registers are reserved in the display driver chip, for example, for setting and adjusting parameters of the displayed image data during the gray scale correction. After the gamma curve comprising a group of characteristic gray scale points is determined according to the type of the display panel, the characteristic gray scale points are sent to the display driving chip and stored in the register, and configuration parameters of the register corresponding to each characteristic gray scale point are determined according to the gamma curve.
The configuration parameters are used for representing target gray scale brightness values corresponding to the characteristic gray scale points, for example, a plurality of groups of target gray scale brightness values can be prestored in a display driving chip in a local storage mode, the target gray scale brightness values respectively correspond to gamma curves comprising a group of characteristic gray scale points under each display panel type determination through data coding, and when the configuration parameters are used, the gamma curves are called through matching of the coding, so that the rapid correction of register parameters is realized.
Step S130: and performing gray scale correction on the image data of the display panel according to the configuration parameters of the register corresponding to each characteristic gray scale point.
In step S130, adjusting the parameters of each of the characteristic gray-scale points according to the configuration parameters of the register; and then adjusting the parameters of each gray scale on the gamma curve according to the adjusted parameters of each characteristic gray scale point, wherein the image data of the display panel comprises the parameters of each gray scale on the gamma curve.
Further, the adjusting the parameter of each characteristic gray-scale point according to the configuration parameter of the register specifically includes: acquiring the current parameter of a register corresponding to each characteristic gray-scale point; comparing the current parameter with the configuration parameter of the corresponding register; when the current parameter is not consistent with the configuration parameter, the current parameter is adjusted according to the configuration parameter.
In the gamma correction process, a plurality of gray scales are generally determined as adjusting points, and a gamma curve is fitted according to the adjusting points. For example, for an 8-bit color depth system, the gray levels are 0 to 255, and 255, 223, 191, 128, 107, 64, 35, 15, and 0 can be determined as the adjustment points, which are referred to as tie point gray levels. However, the number of tie point gray scales in the current high-resolution display panel is generally as large as several tens, and each tie point gray scale is often required to be adjusted for many times, so that the time for performing gamma correction is long, and the production efficiency is affected. In this embodiment, assuming that a gamma curve that the display panel can pass through correction is given, first, a plurality of discrete points are correspondingly determined from binding point gray scales on the gamma curve according to the type of the display panel as a group of characteristic gray scale points, and the position relationship of the group of characteristic gray scale points is related to the type of the display panel (for example, as described in the foregoing step S110, which is not described herein again); then, the following operations are performed on the set of characteristic gray-scale points: obtaining the current parameter of a register corresponding to each characteristic gray-scale point, determining the configuration parameter of the register corresponding to each characteristic gray-scale point according to a gamma curve, comparing the current parameter with the configuration parameter of the corresponding register, when the current parameter is inconsistent with the configuration parameter, adjusting the current parameter according to the configuration parameter, simultaneously inputting the optical parameters such as brightness (and/or color coordinates) and the like after the display driving chip is adjusted through the configuration parameter of the test register until the optical parameters are adjusted to a target value (determined by the product specification during design), and obtaining the data voltage corresponding to the adjusted characteristic gray-scale point.
According to the related technology, the known gamma correction method further comprises the steps of obtaining data voltages corresponding to each characteristic gray scale point according to the data voltages of the characteristic gray scale points, obtaining data voltages corresponding to other gray scale points except the characteristic gray scale points through an interpolation method, calculating register configuration parameters corresponding to each gray scale point according to a data voltage formula of the display driving chip, and correcting the gray scale points according to the register configuration parameters corresponding to the gray scale points.
FIG. 5 is a schematic diagram of a gamma correction apparatus according to an embodiment of the present invention.
AMOLED products generally need to be subjected to automatic gamma debugging in large-scale production. Referring to fig. 5, in another aspect, an embodiment of the present invention further provides a gamma correction apparatus 10, the gamma correction apparatus 10 is connected to a display panel 20 and a display driver chip 30, the display driver chip 30 is used for providing a driving signal for driving the display panel 20, and may be implemented, for example, based on an arm (advanced RISC machine) processor or based on a Field Programmable Gate Array (FPGA), a Personal Computer (PC), and the like.
In the present embodiment, the gamma correction device 10 includes: a driving module 110, a calibration control module 120 and a saving module 130, wherein the driving module 110 is connected to the calibration control module 120 and the display panel 20 respectively for providing power and control signals to the display panel 20.
The calibration control module 120 is respectively connected to the driving module 110 and the display panel 20, and is configured to: determining a set of characteristic gray-scale points according to the type of the display panel 20, and sending the set of characteristic gray-scale points to the display driving chip 30 through the driving module 110; storing the group of characteristic gray scale points in a register; and controlling the display driver chip 30 to perform gray scale correction on the image data of the display panel 20 according to the set of characteristic gray scale points, wherein the memory is disposed in the display driver chip 30, and the set of characteristic gray scale points are discrete points on a gamma curve.
The saving module 130 is respectively connected to the driving module 110 and the correction control module 120, and is configured to save the gamma curve corresponding to the type of the display panel 20 and the configuration parameters of the registers corresponding to the set of characteristic gray-scale points in the display driving chip 30.
Further, the calibration control module 120 includes: an acquisition unit 121, a determination unit 122, a selection unit 123, and an adjustment unit 124.
Referring to fig. 6, wherein the acquiring unit 121 is used for acquiring the type of the display panel 20; the selecting unit 123 is connected to the obtaining unit 121, and is configured to determine a gamma curve including a set of the characteristic gray scale points according to the type of the display panel 20; the determining unit 122 is connected to the obtaining unit 121, and is configured to determine configuration parameters of the register corresponding to each characteristic gray-scale point according to the gamma curve; the obtaining unit 121 is connected to the determining unit 122, and is further configured to obtain a current parameter of a register corresponding to each feature gray-scale point.
The adjusting unit 124 is respectively connected to the selecting unit 123 and the determining unit 122, and configured to adjust the parameter of each characteristic gray-scale point according to the configuration parameter of the register, and adjust the parameter of each gray-scale point on the gamma curve according to the adjusted parameter of each characteristic gray-scale point, where the image data of the display panel 20 includes the parameter of each gray-scale point on the gamma curve.
In this embodiment, the adjusting unit 124 can perform real-time red, green, and blue sub-pixel voltage matching and debugging according to the driving voltage, the luminance mapping relationship, and the like of the display panel 20, so as to modify the optical parameters of the product, obtain the corrected register parameters, compare the corrected register parameters with the pre-stored configuration parameters, further determine whether the correction of the register parameters is accurate, improve the correction accuracy, and enhance the display effect.
The correction process of red, green and blue sub-pixels is the same, and therefore, the data storage form is the same, for example, the stored data structure includes a set of target register parameters and multiple sets of alternative register parameters corresponding to the red sub-pixel R, a set of target register parameters and multiple sets of alternative register parameters corresponding to the green sub-pixel G, a set of target register parameters and multiple sets of alternative register parameters corresponding to the blue sub-pixel B, and the data used in the correction process is from a set of target register parameters (the configuration parameters mentioned above) corresponding to the type of the display panel 20 (including but not limited to N-type display panel and P-type display panel) in the data of the multiple sets of alternative register parameters corresponding to the data structure of each pixel, through cooperation with the display driving chip 30 and the optical measurement device, one of the candidate register parameters in the corresponding pixel data structure is determined as a corresponding target register parameter (the configuration parameter) according to the type of the display panel 20, and the correction of the characteristic gray scale point is performed.
Further, the gamma correction device 10 further includes a detection module 140, the detection module 140 is connected to the display driver chip 30, and is configured to detect a comparison between a current parameter of a corresponding register of each characteristic gray-scale point and the configuration parameter, and determine whether the current parameter is consistent with the configuration parameter, if the current parameter is inconsistent with the configuration parameter, the detection module 140 outputs an invalid detection signal, the gamma correction device 10 executes the gamma correction method in the foregoing embodiment according to the invalid detection signal, and performs a cycle detection until the detection module 140 outputs an valid detection signal, where the valid detection signal represents that the parameter of the corresponding register of each characteristic gray-scale point after adjustment is consistent with the configuration parameter.
Further, the detection module 140 further includes a color analyzer for testing the display brightness value (and/or color coordinates) after the corrected register parameter is inputted to the display panel 20.
In summary, the gamma correction method and apparatus provided in the embodiments of the present invention can determine a gamma curve including a set of the characteristic gray-scale points according to the type of the display panel, where the set of the characteristic gray-scale points are discrete points of the gamma curve; storing the characteristic gray scale points in a register; and performing gray scale correction on the image data of the display panel according to the characteristic gray scale points. Compared with the prior art that the binding point gray scale (characteristic gray scale point) is fixed in position and only aims at the test correction of one display panel type, the gamma correction method and the gamma correction device provided by the invention can flexibly determine the position of the characteristic gray scale point according to the display panel type, can be compatible with the correction work of different display panel types while realizing gamma correction, not only ensures the display effect, but also effectively saves the test cost and improves the production efficiency.
In addition, in the step of determining a plurality of binding point gray scales as the characteristic gray scale points in the embodiment, during the execution process, which binding point gray scales are specifically selected as a group of characteristic gray scale points is determined according to the type of the tested display panel, and the positions of the binding point gray scales can be determined by pre-design and/or adjusted according to the correction results of a plurality of same display panel types.
It should be noted that in the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientation or positional relationship, are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (11)
1. A gamma correction method, comprising:
determining a group of characteristic gray scale points according to the type of the display panel, wherein the characteristic gray scale points are discrete points of a gamma curve;
storing the set of characteristic grayscale points in a register; and
performing gray scale correction on the image data of the display panel according to the set of characteristic gray scale points,
wherein the display panel comprises an N-type display panel and a P-type display panel, the N-type display panel and the P-type display panel are respectively provided with a gamma curve comprising a group of characteristic gray scale points, the positions of the characteristic gray scale points on different gamma curves are different,
in the gamma curve corresponding to the N-type display panel, the interval of the characteristic gray scale points in the low gray scale range is smaller than the interval in the high gray scale range, and in the gamma curve corresponding to the P-type display panel, the interval of the characteristic gray scale points in the low gray scale range is larger than the interval in the high gray scale range.
2. The gamma correction method according to claim 1, wherein a gray-scale difference value between any adjacent two of the determined set of characteristic gray-scale points is a power of 2.
3. The gamma correction method of claim 2, wherein the determining a set of characteristic gray scale points according to a display panel type comprises:
and determining a gamma curve according to the type of the display panel, wherein the gamma curve comprises a group of characteristic gray scale points corresponding to the type of the display panel.
4. The gamma correction method of claim 1, wherein the performing gray scale correction of the image data of the display panel according to the set of characteristic gray scale points comprises:
determining configuration parameters of a register corresponding to each characteristic gray scale point according to the gamma curve;
adjusting the parameters of each characteristic gray scale point according to the configuration parameters of the register;
adjusting the parameters of each gray scale on the gamma curve according to the adjusted parameters of each characteristic gray scale point,
the image data of the display panel comprises parameters of various gray scales on the gamma curve.
5. The gamma correction method of claim 1, wherein a low gray scale range slope is smaller than a high gray scale range slope in a gamma curve corresponding to the N-type display panel.
6. The gamma correction method of claim 1, wherein a slope of a low gray scale range is greater than a slope of a high gray scale range in a gamma curve corresponding to the P-type display panel.
7. The gamma correction method of claim 4, wherein the adjusting the parameters of the characteristic gray scale points according to the configuration parameters of the register comprises:
acquiring the current parameter of a register corresponding to each characteristic gray-scale point;
comparing the current parameter with the configuration parameter of the corresponding register;
and when the current parameter is inconsistent with the configuration parameter, adjusting the current parameter according to the configuration parameter.
8. A gamma correction device to which a display panel and a display driving chip are connected, wherein the gamma correction device comprises:
the driving module is connected with the display panel and the display driving chip and used for providing power supply and control signals for the display panel and the display driving chip;
and the correction control module is respectively connected with the driving module and the display panel and is used for:
determining a group of characteristic gray scale points according to the type of the display panel, and sending the group of characteristic gray scale points to the display driving chip through the driving module, wherein the group of characteristic gray scale points are discrete points of a gamma curve;
storing the set of characteristic grayscale points in a register; and
controlling the display driving chip to perform gray scale correction on the image data of the display panel according to the characteristic gray scale points,
wherein the display panel comprises an N-type display panel and a P-type display panel, the N-type display panel and the P-type display panel are respectively provided with a gamma curve comprising a group of characteristic gray scale points, the positions of the characteristic gray scale points on different gamma curves are different,
in the gamma curve corresponding to the N-type display panel, the interval of the characteristic gray scale points in the low gray scale range is smaller than the interval in the high gray scale range, and in the gamma curve corresponding to the P-type display panel, the interval of the characteristic gray scale points in the low gray scale range is larger than the interval in the high gray scale range.
9. The gamma correction device of claim 8, further comprising:
a storage module connected with the drive module and the correction control module respectively for storing the gamma curve corresponding to the display panel type and the configuration parameters of the register corresponding to the group of characteristic gray scale points to the display drive chip,
the register is arranged in the display driving chip.
10. The gamma correction device of claim 8, wherein the correction control module comprises:
an acquisition unit configured to acquire the display panel type;
the selection unit is connected with the acquisition unit and used for determining a gamma curve comprising a group of characteristic gray scale points according to the type of the display panel;
the determining unit is connected with the selecting unit and used for determining configuration parameters of the register corresponding to each characteristic gray scale point according to the gamma curve;
the adjusting unit is respectively connected with the selecting unit and the determining unit and is used for adjusting the parameters of each characteristic gray scale point according to the configuration parameters of the register and adjusting the parameters of each gray scale on the gamma curve according to the adjusted parameters of each characteristic gray scale point,
the image data of the display panel comprises parameters of various gray scales on the gamma curve.
11. The gamma correction device of claim 10, further comprising:
a detection module connected with the display driving chip and used for detecting the comparison between the current parameter of the register corresponding to each characteristic gray-scale point and the configuration parameter, judging whether the current parameter is consistent with the configuration parameter, if the current parameter is inconsistent with the configuration parameter, the detection module outputs an invalid detection signal,
the gamma correction device performs the gamma correction method according to any one of claims 1 to 7 based on the invalid detection signal and performs cyclic detection until the detection module outputs a valid detection signal,
and the effective detection signal represents that the parameters of the corresponding register of each characteristic gray scale point after adjustment are consistent with the configuration parameters.
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| CN112820233B (en) * | 2021-01-28 | 2022-09-13 | 昆山国显光电有限公司 | Gamma debugging method, device and equipment |
| KR20230054987A (en) * | 2021-10-18 | 2023-04-25 | 엘지디스플레이 주식회사 | Gamma voltage generating circuit and display device including the same |
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