CN112447134A - Gray scale correction method and system for display panel - Google Patents
Gray scale correction method and system for display panel Download PDFInfo
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- CN112447134A CN112447134A CN201910824642.6A CN201910824642A CN112447134A CN 112447134 A CN112447134 A CN 112447134A CN 201910824642 A CN201910824642 A CN 201910824642A CN 112447134 A CN112447134 A CN 112447134A
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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]
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/06—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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Abstract
The invention discloses a gray scale correction method and a gray scale correction system of a display panel, wherein the gray scale correction method comprises the following steps: the gamma register in the display panel stores gamma voltage values corresponding to node correction gray scales, and the gray scale correction method comprises the following steps: obtaining an actually measured brightness gray scale curve of a correction area of the display panel; obtaining a detection brightness value corresponding to the correction area at the maximum input gray scale according to the actually measured brightness gray scale curve; judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value; and if so, obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction value corresponding to the input gray scale of each node is recorded in the gray scale correction table.
Description
Technical Field
The invention relates to the technology in the field of OLED panels, in particular to a gray scale correction method and system of a display panel.
Background
Organic light emitting display devices (OLEDs) are active light emitting devices. Compared with the current mainstream flat panel display technology, the thin film transistor liquid crystal display (TFT-LCD) has the advantages of high contrast, wide viewing angle, low power consumption, thinner volume and the like, is expected to become the next generation of flat panel display technology after the LCD, and is one of the most concerned technologies in the current flat panel display technology.
Due to the non-uniformity of characteristics of the TFT and the OLED, the luminance of the OLED is different under the same gray scale and data voltage, and a Mura phenomenon, which is a panel having non-uniform luminance in various regions, occurs. Mura refers to a phenomenon in which various marks are caused by non-uniform brightness of a display. The conventional LTPS-TFT is limited by the crystallization process, and the electrical property at different positions on the glass substrate is not uniform, which often causes the brightness of the OLED display device to be not uniform, i.e., Mura that can be sensed by human eyes. In order to compensate yield loss caused by the non-uniformity, in the panel industry, besides sub-pixel circuit compensation and process optimization, a De-Mura mode of external brightness compensation is introduced at present, wherein a gray scale compensation method is adopted widely, good effects are obtained at medium and low gray scales with heavier Mura, but for higher gray scales displayed by 8 bits (or higher bits), the De-Mura meets the ceiling, only part of pixel gray scales can be reduced, and the high gray scale compensation effect is limited on the premise of ensuring specification brightness.
Disclosure of Invention
In view of the problems in the prior art, an object of the present invention is to provide a gray scale correction method and system for a display panel, which can establish a mapping relationship between an input gray scale and a correction gray scale through a gray scale correction table, and set a spare gamma register in a driving circuit in advance, and store a gamma voltage corresponding to a node correction gray scale larger than a maximum input gray scale in the spare gamma register, so as to improve a high gray scale compensation effect, i.e., the brightness of a gamma voltage value corresponding to a correction gray scale having a display gray scale value larger than the maximum input gray scale.
According to an aspect of the present invention, there is provided a gray scale correction method of a display panel in which a gamma register stores therein a gamma voltage value corresponding to a node correction gray scale, the gray scale correction method comprising:
obtaining an actually measured brightness gray scale curve of a correction area of the display panel;
obtaining a detection brightness value corresponding to the correction area at the maximum input gray scale according to the actually measured brightness gray scale curve;
judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value;
and if so, obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction value corresponding to the input gray scale of each node is recorded in the gray scale correction table.
Preferably, the obtaining of the measured brightness gray-scale curve of the correction area of the display panel includes:
obtaining a detection brightness value of the correction area of the display panel under each node input gray scale;
and fitting according to the node input gray scale and the detection brightness value to obtain the actually measured brightness gray scale curve of the correction area, wherein the actually measured brightness gray scale curve comprises an extension section, and the gray scale value of the extension section is greater than the gray scale value of the maximum input gray scale.
Preferably, the obtaining a gray scale correction table according to the actually measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected to a driving chip of the display panel includes:
obtaining the standard brightness value corresponding to each node input gray scale according to the standard brightness gray scale curve of the correction area;
obtaining a gray scale corresponding to each standard brightness value according to the actually measured brightness gray scale curve to serve as a correction gray scale;
obtaining the correction value corresponding to the node input gray scale according to the node input gray scale and the correction gray scale corresponding to the node input gray scale;
forming the node input gray scale and the correction value associated with each standard brightness value into the gray scale correction table;
and writing the gray scale correction table into a storage medium connected with the driving chip of the display panel.
Preferably, the display panel includes a touch panel, and before the obtaining of the measured luminance grayscale curve of the correction area of the display panel, the method further includes:
receiving, by the touch panel, position information of an area of the display panel where display is abnormal;
and generating at least one correction area according to the position information, wherein the correction area comprises a plurality of sub-pixels.
Preferably, the correction area includes all sub-pixels in the display panel.
According to an aspect of the present invention, there is provided a gray scale correction system of a display panel, including:
the curve fitting module is used for obtaining an actually-measured brightness gray scale curve of the correction area of the display panel;
the end value extraction module is used for obtaining a detection brightness value corresponding to the maximum input gray scale of the correction area according to the actually measured brightness gray scale curve;
the brightness comparison module is used for judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value or not;
and the correction module is used for obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction amount corresponding to each node input gray scale is recorded in the gray scale correction table.
Preferably, the curve fitting module includes:
the brightness detection unit is used for obtaining the detection brightness value of the correction area of the display panel under each node input gray scale;
and the fitting unit is used for fitting the node input gray scale and the detection brightness value to obtain the actually measured brightness gray scale curve of the correction area, wherein the actually measured brightness gray scale curve comprises an extension section, and the gray scale value of the extension section is greater than the gray scale value of the maximum input gray scale.
Preferably, the display panel includes at least one correction area, each correction area corresponds to a gray scale correction table, and the method includes:
when each frame of image is displayed, determining the input gray scale corresponding to the sub-pixels of each display panel according to the image data corresponding to the frame of image;
obtaining the correction gray scale of the sub-pixel according to the gray scale correction table of the correction area to which the sub-pixel belongs;
acquiring a gamma voltage value of the sub-pixel in a gamma register according to the correction gray scale;
and providing gamma voltages for the sub-pixels according to the gamma voltage value of each sub-pixel.
Preferably, the correction area includes all sub-pixels in the display panel.
The beneficial effects of the above technical scheme are: the invention can establish the mapping relation between the input gray scale and the correction gray scale through the gray scale correction table, set a spare gamma register in the driving circuit in advance, and store the gamma voltage corresponding to the node correction gray scale which is larger than the maximum input gray scale in the spare gamma register, thereby improving the high gray scale compensation effect, namely, the brightness of the gamma voltage value corresponding to the correction gray scale which displays the gray scale value which is larger than the maximum input gray scale.
Further features and advantages of the invention, as well as the structure and operation of various embodiments of the invention, are described in detail below with reference to the accompanying drawings. It should be noted that the present invention is not limited to the specific embodiments described herein. These examples are given herein for illustrative purposes only.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.
FIG. 1 is a flowchart illustrating a gray scale correction method for a display panel. (ii) a
FIG. 2 is a block diagram of a display panel;
FIG. 3 is a diagram illustrating a measured luminance gray-scale curve and a standard luminance gray-scale curve of the calibration area in FIG. 2;
FIG. 4 is a schematic view of a process for obtaining an actual measurement luminance gray scale curve;
FIG. 5 is a flowchart of a gray level correction table acquisition;
FIG. 6 is a block diagram of a gray scale correction system for a display panel;
FIG. 7 is a flowchart illustrating a display method of a display panel;
fig. 8 is a block diagram of a driving circuit.
The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Throughout the drawings, like reference numerals designate corresponding elements. In the drawings, like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
According to one aspect of the present invention, a gray scale correction method of a display panel is provided.
FIG. 1 is a flowchart illustrating a gray scale correction method for a display panel. The gradation correction method of the display panel shown in fig. 1 includes:
step S101, obtaining an actually measured brightness gray scale curve of a correction area of a display panel;
step S102, obtaining a detection brightness value corresponding to the maximum input gray scale of the correction area according to the actually measured brightness gray scale curve;
step S103, judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value;
and step S104, if yes, obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area, and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction value corresponding to each node input gray scale is recorded in the gray scale correction table.
Fig. 2 is a block diagram of a display panel. The gray scale correction method shown in fig. 1 can be applied to the display panel 10 of fig. 2, the display panel 10 includes at least one correction region 11, the display panel includes a driving chip 12, a gamma register in the driving chip 12 stores a gamma voltage value corresponding to the node correction gray scale, and the display panel 10 provides a gamma voltage to each sub-pixel according to the gamma voltage value in the gamma register. The driving chip 12 includes a gamma register corresponding to each node correction gray scale, and the node correction gray scales are selected from all the correction gray scales, for example, the correction gray scale is 0-300, and then a plurality of gray scales from 0-300 are selected as the node correction gray scales. The gamma register in the driver chip 12 stores a value corresponding to each node correction gray level, and the value corresponds to a gamma voltage. The gamma register in the prior art only stores the gamma voltage value corresponding to the maximum input gray scale.
The gamma voltage values for gray level correction at the respective nodes of the gamma register in the driver chip 12 are stored during the manufacturing process of the display panel 10. The process of obtaining the gamma voltage values corresponding to the correction gray scales is to establish the corresponding relationship between the brightness and the gamma voltage values of the different correction gray scales.
In the prior art, the luminance formula of a pixel when the maximum input gray scale is 255 is:
wherein Lgray is the brightness of Gray level Gray;
gamma is an index, generally taken as 2.2;
l255 is the brightness corresponding to the gray scale 255.
In this embodiment, the luminance formula of the pixels in the display panel 10 is:
wherein: 255+ Δ is the maximum correction gray level. That is, the brightness formula corresponding to the gray scale 255 in the present embodiment is:
obtaining a formula II/a formula III:
i.e. the same as formula (r). It is explained by the above formula that the actual measurement luminance gray scale curve corresponding to the calibration area of the display panel 10 in the present application does not change the corresponding relationship between the luminance and the gray scale in the section of 0 to 255. The existing Gamma debugging process is not changed, and the influence is not causedIn the existing Gamma adjustment relation displayed by 8 bits (the highest 255), only newly increased gray scales larger than 255 are debugged, a spare Gamma register is added, and a gray scale voltage value corresponding to the node correction gray scale larger than 255 is stored in the spare Gamma register, wherein 255+ delta is the maximum correction gray scale. After the gamma voltage value corresponding to each node correction gray scale is stored in the gamma register, the gray scale correction method of the display panel shown in fig. 1 is performed.
Fig. 3 is a schematic diagram of the measured luminance gray-scale curve and the standard luminance gray-scale curve of the calibration area in fig. 2. FIG. 4 is a schematic diagram of a process for obtaining a gray-scale curve of measured luminance. Referring to fig. 3 and 4, in step S101, an actually measured luminance grayscale curve 32 of the correction region 11 of the display panel is obtained. Step S101 specifically includes step S401 and step S402. In step S401, a detected brightness value of the correction area 11 of the display panel at each node input gray level is obtained, where the node input gray levels are a plurality of gray levels selected from all input gray levels, for example, the input gray levels are 0 to 255, and 256 input gray levels are total, and 5, 7, or 9 gray levels are selected from 0 to 255 as the node input gray levels. And detecting by the testing equipment to obtain a corresponding detection brightness value under the input gray scale of each node. In step S402, a measured luminance gray-scale curve 32 of the calibration area is obtained by fitting the node input gray-scale and the detected luminance value, wherein the measured luminance gray-scale curve 32 includes an extension 321, and a gray-scale value of the extension is greater than a gray-scale value of the maximum input gray-scale. The actually measured luminance gray scale curve 32 of the correction area 11 can be obtained according to the node input gray scale and the detection luminance value, and the extension section 321 is obtained by extending the input gray scale "255" as the node input gray scale, and the correction gray scale is obtained by matching the extension section, that is, the correction gray scale is obtained according to the mathematical relationship of the extension section, referring to the formula (II). In step S102, a detection luminance value L1 corresponding to the maximum input gray level (255) of the correction region 11 is obtained from the measured luminance gray level curve 32. The maximum input gray level is 255, and the detected luminance value L1 at the input gray level (255) can be obtained by actually measuring the luminance gray level curve 32. In step S103, it is determined whether the detected luminance value L1 corresponding to the maximum input gray level (255) is less than the standard luminance value (L0). Fig. 3 shows a standard luminance gray-scale curve 31 of the calibration region 11, from which a standard luminance value (L0) at the maximum input gray-scale (255) can be obtained according to the standard luminance gray-scale curve 31.
FIG. 5 is a flowchart of the acquisition of a gray scale correction table. In step S104, the detection brightness value L1 corresponding to the maximum input gray level (255) is smaller than the standard brightness value (L0), a gray level correction table is obtained according to the actually measured brightness gray level curve 32 and the standard brightness gray level curve 31 in the correction region, and the gray level correction table is written into a storage medium connected to the driver chip of the display panel, where the storage medium may be the driver chip 12 of the display panel 10 or an independent memory connected to the driver chip 12 outside the display panel 10. The gray scale correction table records the correction value corresponding to each node input gray scale. Step S104 specifically includes steps S501, S502, S503, and S504. In step S501, a standard luminance value corresponding to the input gray scale of each node is obtained according to the standard luminance gray scale curve of the calibration area. Step S502, obtaining the gray scale corresponding to each standard brightness value as the correction gray scale according to the actual measurement brightness gray scale curve. Step S503, obtaining the correction amount corresponding to the node input gray scale according to the node input gray scale and the correction gray scale corresponding to the node input gray scale. For example, if the node input gray level has a gray level value of 230 and the corresponding correction gray level is 234, the correction amount for the node input gray level is 4. In step S504, the node input gray scale and the correction amount associated with each standard luminance value are combined into a gray scale correction table. Step S505, writing the gray scale correction table into a storage medium connected to the driving chip of the display panel. For example, when the node input gray level is 255, the detected luminance value corresponding to the node input gray level (255) is L1, the standard luminance value corresponding to the standard luminance gray level curve 31 is L0, and the gray level value corresponding to L0 on the actual luminance gray level curve 32 is 291, so that the corrected gray level corresponding to the node input gray level 255 is 291 and the corresponding correction amount is 36. The correction value of the input gray scale between the node input gray scales can be obtained by performing linear interpolation on the correction values of the two adjacent node input gray scales. Thus, only a small number of node input gray levels and their corresponding correction amounts can be recorded in the gray-level correction table.
The gamma register stores a gamma voltage value corresponding to a correction gray scale having a gray scale greater than the maximum input gray scale. For example, the gamma register corresponding to the gray level "255" has a value "1400", the gamma register corresponding to the maximum input gray level 255 has a value of 291, and the gamma register corresponding to the gray level "291" has a value "1600" according to the formula (ii). Each gamma register corresponds to a node correction gray scale selected from the correction gray scales, and the value in each gamma register corresponds to a gamma voltage value. The gamma voltage values corresponding to the correction gray scales located between the node correction gray scales are obtained by linear interpolation. For example: the two gamma registers store gamma voltage values a and b of "255" and "255 + Δ" two node correction gray levels, respectively, and the gamma voltage values of the gray levels between "255" and "255 + Δ" are obtained by linear interpolation, that is, according to the following formula: v ═ a + (b-a) × (Gray-255)/Δ.
In some embodiments, the display panel includes a touch panel, and before obtaining the measured luminance gray-scale curve of the calibration area of the display panel, the method further includes: receiving, by a touch panel, position information of an area of the display panel where display is abnormal; at least one correction area is generated according to the position information, wherein the correction area comprises a plurality of sub-pixels. For example, a touch panel is provided on the display panel, and the touch panel can quickly capture the correction area, that is, receive the position information of the area of the display panel where the display is abnormal. A correction area including a plurality of sub-pixels on the display panel is generated based on the position information of the abnormal area. The correction area may comprise all sub-pixels in the display panel, i.e. the entire display panel as one correction area.
According to one aspect of the present invention, a gray scale correction system for a display panel is provided.
Fig. 6 is a block diagram of a gray scale correction system for a display panel. The gradation correction system 600 shown in fig. 6 includes:
the curve fitting module 601 obtains an actually measured luminance gray scale curve of the correction area of the display panel. The curve fitting module 601 includes: the brightness detection unit is used for obtaining the detection brightness value of the correction area of the display panel under each node input gray scale; and the fitting unit is used for fitting the node input gray scale and the detection brightness value to obtain the actually measured brightness gray scale curve of the correction area, wherein the actually measured brightness gray scale curve comprises an extension section, and the gray scale value of the extension section is greater than the gray scale value of the maximum input gray scale.
The end value extracting module 602 obtains a detection luminance value corresponding to the maximum input gray level of the correction area according to the actually measured luminance gray level curve.
The brightness comparison module 603 determines whether the detected brightness value corresponding to the maximum input gray scale is smaller than the standard brightness value.
The correcting module 604 obtains a gray scale correction table according to the actually measured brightness gray scale curve and the standard brightness gray scale curve of the correction area, and writes the gray scale correction table into a storage medium connected to a driving chip of the display panel, wherein the correction amount corresponding to the input gray scale of each node is recorded in the gray scale correction table.
According to an aspect of the present invention, there is provided a display method of a display panel.
FIG. 7 is a flowchart illustrating a display method of a display panel. The display panel applied in the display method of the display panel in fig. 7 includes at least one correction area, and each correction area corresponds to a gray scale correction table. The display method comprises the following steps:
step S701, when each frame of image is displayed, determining the input gray scale corresponding to the sub-pixels of each display panel according to the image data corresponding to the frame of image;
step S702, obtaining the correction gray scale of the sub-pixel according to the gray scale correction table of the correction area of the sub-pixel;
step S703, obtaining the gamma voltage value of the sub-pixel in the gamma register according to the correction gray scale;
in step S704, a gamma voltage is provided to the sub-pixels according to the gamma voltage value of each sub-pixel.
Fig. 8 is a block diagram of a driving circuit. The driving circuit shown in fig. 8 includes a gamma generator 121, a gamma register 122, and a multiplexer 123. The gamma generator 121 includes a reference voltage selector for generating reference voltages gamma h and gamma l, and the multiplexer 123 includes a plurality of input terminals for obtaining a plurality of different voltages from different resistors, and an output terminal for outputting one of the plurality of input voltages as a gamma voltage of a gray scale. The gamma register 122 in fig. 8 is the driver chip, and the value of the gamma register 122 is used to select one of the multiplexers 123, so as to determine the output voltage (gamma voltage) of the multiplexer 123. The correction area may be the entire display panel, i.e. the correction area comprises all sub-pixels in the display panel.
In summary, the present invention can establish a mapping relationship between the input gray scale and the correction gray scale through the gray scale correction table, and set a spare gamma register in the driving circuit in advance, and store the gamma voltage corresponding to the node correction gray scale larger than the maximum input gray scale in the spare gamma register, thereby improving the high gray scale compensation effect, i.e. the brightness of the gamma voltage value corresponding to the correction gray scale with the display gray scale value larger than the maximum input gray scale.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A gray scale correction method of a display panel is characterized in that a gamma voltage value corresponding to a node correction gray scale is stored in a gamma register in the display panel, and the gray scale correction method comprises the following steps:
obtaining an actually measured brightness gray scale curve of a correction area of the display panel;
obtaining a detection brightness value corresponding to the correction area at the maximum input gray scale according to the actually measured brightness gray scale curve;
judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value;
and if so, obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction value corresponding to the input gray scale of each node is recorded in the gray scale correction table.
2. The method of claim 1, wherein the obtaining the measured luminance grayscale curve of the correction region of the display panel comprises:
obtaining a detection brightness value of the correction area of the display panel under each node input gray scale;
and fitting according to the node input gray scale and the detection brightness value to obtain the actually measured brightness gray scale curve of the correction area, wherein the actually measured brightness gray scale curve comprises an extension section, and the gray scale value of the extension section is greater than the gray scale value of the maximum input gray scale.
3. The method of claim 2, wherein the obtaining a gray scale correction table according to the measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected to a driving chip of the display panel comprises:
obtaining the standard brightness value corresponding to each node input gray scale according to the standard brightness gray scale curve of the correction area;
obtaining a gray scale corresponding to each standard brightness value according to the actually measured brightness gray scale curve to serve as a correction gray scale;
obtaining the correction value corresponding to the node input gray scale according to the node input gray scale and the correction gray scale corresponding to the node input gray scale;
forming the node input gray scale and the correction value associated with each standard brightness value into the gray scale correction table;
and writing the gray scale correction table into a storage medium connected with the driving chip of the display panel.
4. The method for calibrating gray scale of a display panel according to claim 1, wherein the display panel comprises a touch panel, and before the obtaining the measured brightness gray scale curve of the calibration area of the display panel, the method further comprises:
receiving, by the touch panel, position information of an area of the display panel where display is abnormal;
and generating at least one correction area according to the position information, wherein the correction area comprises a plurality of sub-pixels.
5. The method according to claim 1, wherein the correction region includes all the sub-pixels in the display panel.
6. A gray scale correction system for a display panel, comprising:
the curve fitting module is used for obtaining an actually-measured brightness gray scale curve of the correction area of the display panel;
the end value extraction module is used for obtaining a detection brightness value corresponding to the maximum input gray scale of the correction area according to the actually measured brightness gray scale curve;
the brightness comparison module is used for judging whether the detection brightness value corresponding to the maximum input gray scale is smaller than a standard brightness value or not;
and the correction module is used for obtaining a gray scale correction table according to the actually-measured brightness gray scale curve and the standard brightness gray scale curve of the correction area and writing the gray scale correction table into a storage medium connected with a driving chip of the display panel, wherein the correction amount corresponding to each node input gray scale is recorded in the gray scale correction table.
7. The system of claim 6, wherein the curve fitting module comprises:
the brightness detection unit is used for obtaining the detection brightness value of the correction area of the display panel under each node input gray scale;
and the fitting unit is used for fitting the node input gray scale and the detection brightness value to obtain the actually measured brightness gray scale curve of the correction area, wherein the actually measured brightness gray scale curve comprises an extension section, and the gray scale value of the extension section is greater than the gray scale value of the maximum input gray scale.
8. A display method of a display panel, wherein the display panel comprises at least one correction area, each correction area corresponds to a gray scale correction table, comprising:
when each frame of image is displayed, determining the input gray scale corresponding to the sub-pixels of each display panel according to the image data corresponding to the frame of image;
obtaining the correction gray scale of the sub-pixel according to the gray scale correction table of the correction area to which the sub-pixel belongs;
acquiring a gamma voltage value of the sub-pixel in a gamma register according to the correction gray scale;
and providing gamma voltages for the sub-pixels according to the gamma voltage value of each sub-pixel.
9. The display method of the display panel according to claim 8, wherein the correction region includes all the sub-pixels in the display panel.
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