CN109147689B - Liquid crystal display and gamma curve adjusting method thereof - Google Patents
Liquid crystal display and gamma curve adjusting method thereof Download PDFInfo
- Publication number
- CN109147689B CN109147689B CN201810954231.4A CN201810954231A CN109147689B CN 109147689 B CN109147689 B CN 109147689B CN 201810954231 A CN201810954231 A CN 201810954231A CN 109147689 B CN109147689 B CN 109147689B
- Authority
- CN
- China
- Prior art keywords
- gray scale
- gray
- adjusting
- gamma value
- gamma
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- 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
Abstract
The invention discloses a liquid crystal display and a gamma curve adjusting method thereof. The adjusting method comprises the following steps: adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value; adjusting to enable a gamma value corresponding to a set gray scale to be larger than the target gamma value, wherein the set gray scale is smaller than the highest gray scale of a specific low gray scale range and larger than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is smaller than the highest gray scale in the full gray scale range; the adjustment is performed so that the gamma values corresponding to the respective gray scales larger than the lowest gray scale and smaller than the set gray scale increase in order of the gray scale size, and the adjustment is performed so that the gamma values corresponding to the respective gray scales larger than the set gray scale and smaller than the highest gray scale of the specific low gray scale range decrease in order of the gray scale size. The brightness corresponding to each gray scale in the specific low gray scale range is reduced as a whole, so that the problem of side view color cast of the liquid crystal display can be effectively solved.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a liquid crystal display and a gamma curve adjusting method thereof.
Background
A liquid crystal display is a flat, ultra-thin display device consisting of a certain number of color or black and white pixels placed in front of a light source or a reflecting surface. Liquid crystal displays are popular because they have low power consumption, high image quality, small size, and light weight. Currently, there are many display modes of the lcd, including Twisted Nematic (TN) mode, in-plane switching (IPS) mode, and Vertical Alignment (VA) mode, and the like, and the various display modes are superior or inferior. Among them, the contrast ratio of the VA mode is higher than that of the IPS mode, and the response time of the VA mode is fast without rubbing, so the VA mode becomes a common display mode of a large-sized liquid crystal display. However, the VA mode has inferior viewing angle characteristics to the IPS mode, and a color shift problem occurs in a liquid crystal display of the VA mode in a side view.
Through analysis and experimental detection, the fundamental reason of the side-looking color cast of the VA display mode is that the gamma curve in the side-looking mode is inconsistent with the gamma curve in the front-looking mode, so that human eyes feel the color cast in the side-looking mode, and the gamma curve difference between the side-looking mode and the front-looking mode is larger. As shown in FIG. 1, the curve labeled On-axis is a front-view gamma curve, and the curve labeled Off-axis is a side-view gamma curve, so that the front-view gamma curve and the side-view gamma curve have obvious difference, especially have larger difference in the low gray scale range. Specifically, taking an asian skin color screen as an example, the grayscale values of RGB of skin colors common to asians are R220, G150, and B100, respectively, and when the same screen is viewed from the side, the grayscale values of RGB of skin colors are R215, G192, and B176, respectively, and it is seen that all of RGB have variations, of which the blue grayscale varies most, and the proportion of blue grayscale increases in the side view, which leads to a color shift problem. In addition, the ratio of the red gray scale to the green gray scale is changed, but the change is smaller. Therefore, it can be seen from the above analysis that the VA mode lcd suffers from color shift from front view to side view, mainly due to the large change in the gray scale value within a certain gray scale range.
Disclosure of Invention
In order to solve the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a liquid crystal display and a method for adjusting a gamma curve thereof, which can adjust a gamma value in a specific low gray level range to improve a color shift problem in a side view.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of adjusting a gamma curve, the method comprising:
adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value;
adjusting a gamma value corresponding to a set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is less than the highest gray scale of a specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is less than the highest gray scale in the full gray scale range;
adjusting gamma values corresponding to gray scales larger than the lowest gray scale and smaller than the set gray scale so that gamma values corresponding to gray scales larger than the lowest gray scale and smaller than the set gray scale are increased in order of gray scale size, and adjusting gamma values corresponding to gray scales larger than the set gray scale and smaller than the highest gray scale so that gamma values corresponding to gray scales larger than the set gray scale and smaller than the highest gray scale are decreased in order of gray scale size.
Preferably, the method for adjusting the gamma value corresponding to the set gray level to make the gamma value corresponding to the set gray level greater than the target gamma value comprises:
and adjusting the binding point voltage corresponding to the set gray scale to adjust the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value.
Preferably, the method of adjusting so that the gamma value corresponding to the set gray level is greater than the target gamma value includes:
and adjusting the binding point voltage corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value.
Preferably, the method for adjusting the binding voltage corresponding to the set gray scale includes:
reducing the positive polarity binding point voltage corresponding to the set gray scale;
and increasing the negative polarity binding point voltage corresponding to the set gray scale.
Preferably, an adjustment width of adjusting the positive polarity binding voltage corresponding to the set gray scale is equal to an adjustment width of adjusting the negative polarity binding voltage corresponding to the set gray scale.
Preferably, the method of adjusting the gamma values corresponding to the gray scales greater than the lowest gray scale and less than the set gray scale so that the gamma values corresponding to the gray scales greater than the lowest gray scale and less than the set gray scale increase in order of gray scale size includes: adjusting each binding point voltage corresponding to a gray scale range which is greater than or equal to the lowest gray scale and less than the set gray scale so as to adjust a gamma value corresponding to each gray scale which is greater than the lowest gray scale and less than the set gray scale, so that the gamma value corresponding to each gray scale which is greater than the lowest gray scale and less than the set gray scale is increased according to the gray scale size sequence;
the method for adjusting the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale so that the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale is reduced according to the gray scale sequence comprises the following steps: and adjusting the binding point voltages corresponding to the gray scale ranges which are greater than the set gray scale and less than the highest gray scale so as to adjust the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale, so that the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale are reduced according to the gray scale size sequence.
Or, the method for adjusting the gamma value corresponding to the set gray level to make the gamma value corresponding to the set gray level greater than the target gamma value comprises:
and adjusting the gray scale values of the three primary colors corresponding to the gray scales of the specific low gray scale range to adjust the gamma values corresponding to the set gray scales so that the gamma values corresponding to the set gray scales are greater than the target gamma value.
Or, the method for adjusting the gamma values corresponding to the gray scales larger than the lowest gray scale and smaller than the set gray scale so that the gamma values corresponding to the gray scales larger than the lowest gray scale and smaller than the set gray scale are increased in order of gray scale size includes: adjusting gray scale proportion of three primary colors corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale to adjust gamma values corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale, so that the gamma values corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale are increased according to the gray scale size sequence;
the method for adjusting the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale so that the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale is reduced according to the gray scale sequence comprises the following steps: and adjusting the gray scale proportion of the three primary colors corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale so as to adjust the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale, so that the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale is reduced according to the gray scale sequence.
Preferably, the gamma value corresponding to the set gray scale is greater than 2.4 and less than or equal to 4.
The invention discloses a liquid crystal display, which comprises a memory and a processor, wherein the memory stores a plurality of instructions, and the instructions are suitable for being loaded by the processor and executing the following steps:
adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value;
adjusting a gamma value corresponding to a set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is less than the highest gray scale of a specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is less than the highest gray scale in the full gray scale range;
adjusting gamma values corresponding to gray scales larger than the lowest gray scale and smaller than the set gray scale so that gamma values corresponding to gray scales larger than the lowest gray scale and smaller than the set gray scale are increased in order of gray scale size, and adjusting gamma values corresponding to gray scales larger than the set gray scale and smaller than the highest gray scale so that gamma values corresponding to gray scales larger than the set gray scale and smaller than the highest gray scale are decreased in order of gray scale size.
Has the advantages that: the invention discloses a liquid crystal display and an adjusting method of a gamma curve thereof, which adjust the gamma value corresponding to each gray scale in a specific low gray scale range to be larger than a target gamma value, and make each gamma value corresponding to each gray scale in the specific low gray scale range tend to increase and then decrease, so that the brightness corresponding to each gray scale in the specific low gray scale range is reduced as a whole, and the problem of side view color cast of the liquid crystal display can be effectively improved.
Drawings
FIG. 1 is a front view gamma curve and a side view gamma curve of a prior art LCD;
FIG. 2 is a flowchart illustrating a method for adjusting a gamma curve according to a first embodiment of the present invention;
FIG. 3 is a local gamma curve before and after improvement in accordance with the first embodiment of the present invention;
fig. 4 is a graph illustrating normalized luminance curves before and after improvement according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
Fig. 2 is a flowchart illustrating an adjusting method of a gamma curve according to a first embodiment of the invention, the adjusting method including steps S1 to S3:
step S1: and adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value.
Specifically, taking a liquid crystal display as an example, the liquid crystal display has a driving chip, and the driving chip has a plurality of binding points with adjustable gray scale values, which are called binding point gray scales. Generally, a plurality of binding gray scales are arranged in the full gray scale range, and the gamma value corresponding to each gray scale in the full gray scale range can be adjusted by adjusting the binding voltage of the binding gray scales. As a preferred embodiment, the full gray scale range refers to 0 gray scale to 255 gray scale. And adjusting the gamma voltage of the binding gray scale according to optical parameters such as brightness, chromaticity and the like of the liquid crystal display to enable the gamma value of each gray scale to reach a target gamma value, wherein the target gamma value is more than or equal to 2 and less than or equal to 2.4. The standard gamma value corresponding to the viewing feeling of human eyes is 2.2, and the gamma value varies slightly for liquid crystal displays of different specifications, and the gamma value generally selected in the industry at present is 2.2 +/-0.2.
Step S2: and adjusting the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is smaller than the highest gray scale of the specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is smaller than the highest gray scale in the full gray scale range.
In step S2, a specific low gray scale range to be adjusted is determined, and then a suitable set gray scale is selected. As a preferred embodiment, when a VA display mode lcd is viewed from front and from side, color cast is observed, and it is determined that the color brightness change is relatively large in a specific gray scale range, that is, the gray scale value change is relatively large in a specific gray scale range, and the adjustment is performed in the gray scale range. Specifically, the step of determining the specific low gray scale range includes the following steps one to three:
the method comprises the following steps: and acquiring a front-view gamma curve and a side-view gamma curve.
Specifically, different brightnesses of the liquid crystal display under different gray-scale values are measured from the front side and the side respectively by adopting an optical measuring instrument, and a change curve is drawn according to the gray-scale values and the corresponding brightnesses, so that a front-view gamma curve and a side-view gamma curve are obtained.
Step two: and determining the color with the largest gray scale variation in the three primary colors according to the front-view gamma curve and the side-view gamma curve.
Specifically, a front-view gamma curve and a side-view gamma curve are compared, gray scale variation of three primary colors is calculated from front view to side view respectively, and large gray scale variation represents large brightness variation of the color, so that the proportion occupied by the color is increased, and color cast is caused. Taking the skin color common to asians as an example, in a liquid crystal display, the gray scale values of RGB measured when a skin color picture is viewed are R220, G150, and B100, respectively; when the skin color picture is viewed from the side, the RGB grayscale values are respectively R215, G192, B176, the red grayscale variation is 5, the green grayscale variation is 42, the blue grayscale variation is 76, the visible blue grayscale variation is the largest, and the blue proportion is increased, so that the color shift is caused when the blue grayscale is changed.
Step three: and determining a specific low gray scale range according to the corresponding gray scale value of the color with the largest gray scale variation in the front-view gamma curve, wherein the corresponding gray scale value is in the specific low gray scale range.
As a preferred embodiment, the analysis in step S23 shows that the color with the largest gray-scale variation is blue, and the corresponding gray-scale value of blue in the front-view gamma curve is 100, and a specific low gray-scale range is selected according to the corresponding gray-scale value. As one preferred embodiment, the specific low gray scale range is selected from 0 gray scale to 128 gray scale, the blue gray scale is in the specific low gray scale range, and the red gray scale and the green gray scale are not in the specific low gray scale range, so that when the specific low gray scale range is adjusted, the blue gray scale is adjusted significantly, and the red gray scale and the green gray scale are not affected significantly, so as to obtain a good adjustment effect. In other embodiments, the specific low gray scale range may be other ranges, for example, for different skin colors, the cause of color shift may be caused by changes of gray scales of other colors, for example, a red gray scale or a green gray scale, and at this time, the color with the largest gray scale change amount should be determined according to actual calculation, so as to determine the specific low gray scale range.
Further, as a preferred embodiment, the lowest gray scale is the gray scale of 0, the highest gray scale is the gray scale of 128, and the gray scale is set to the gray scale value corresponding to blue with the largest gray scale variation, and for this embodiment, the gray scale is set to the gray scale of 100.
Specifically, the step of adjusting the gamma value corresponding to the set gray level so that the gamma value corresponding to the set gray level is greater than the target gamma value comprises: and adjusting the binding point voltage corresponding to the set gray scale to adjust the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value. Specifically, in the specific low gray level range of the embodiment, a binding gray level is set, the binding gray level is set to be 31 gray levels, the binding voltage of the binding gray level is adjusted, and the binding voltage corresponding to the set gray level is also adjusted according to the voltage division characteristic of the gamma circuit, so that the gamma value corresponding to the set gray level can be adjusted to the target value.
Further, the method for adjusting the binding voltage corresponding to the set gray level includes the following three ways:
the first method is as follows: and reducing the corresponding positive polarity gamma voltage of the binding gray scale to reduce the brightness of the binding gray scale, so that the gamma value of the binding gray scale is increased. According to the voltage division characteristic of the gamma circuit, the positive polarity gamma voltage corresponding to the set gray scale is correspondingly reduced, so that the brightness of the set gray scale is reduced, and the gamma value corresponding to the set gray scale is increased.
The second method comprises the following steps: and increasing the negative gamma voltage of the binding gray scale to reduce the brightness of the binding gray scale, so that the gamma value of the binding gray scale is increased. According to the voltage division characteristic of the gamma circuit, the negative polarity gamma voltage corresponding to the set gray scale is correspondingly increased, so that the brightness of the set gray scale is reduced, and the gamma value corresponding to the set gray scale is increased.
The third method comprises the following steps: meanwhile, the positive gamma voltage of the binding point gray scale is adjusted down, and the negative gamma voltage of the binding point gray scale is adjusted up, so that the brightness of the binding point gray scale is reduced, the gamma value of the binding point gray scale is increased, the same result can be obtained, and the description is omitted. Further, the variation amount of the positive polarity gamma voltage is the same as that of the negative polarity gamma voltage, so that the occurrence of the flicker of the picture can be prevented.
Step S3: and adjusting the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale so that the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale are increased in the order of the gray scale size, and adjusting the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale so that the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale are decreased in the order of the gray scale size.
Specifically, when a plurality of binding point gray scales are present in the range from the lowest gray scale to the set gray scale, the binding point voltage corresponding to each binding point gray scale is adjusted, and it can be known from the voltage division characteristics of the gamma circuit and the above description that the gamma voltage corresponding to each gray scale in the range from the lowest gray scale to the set gray scale is adjusted, so that the gamma value corresponding to each gray scale can be adjusted, and the gamma value corresponding to each gray scale in the range from the lowest gray scale to the set gray scale can be sequentially increased according to the gray scale size.
Similarly, when a plurality of binding point gray scales are set in the range from the set gray scale to the highest gray scale, the binding point voltage corresponding to each binding point gray scale is adjusted, and according to the voltage division characteristics of the gamma circuit and the description, the gamma voltage corresponding to each gray scale in the range from the set gray scale to the highest gray scale is adjusted, so that the gamma value corresponding to each gray scale can be adjusted, and the gamma value corresponding to each gray scale in the range from the set gray scale to the highest gray scale is reduced according to the gray scale size sequence. Thus, the overall brightness of the specific low gray scale range is reduced, and the ratio of the color having the largest gray scale variation is reduced. As the present embodiment, as shown in fig. 3, the gamma value of the 31 st gray scale is increased to 2.9, thereby increasing the gamma value between the 0 th gray scale and the 128 th gray scale as a whole. As shown in fig. 4, the overall brightness is reduced from 0 gray level to 128 gray level, which reduces the blue color ratio and improves the side-looking color shift. It should be noted that, in the preferred embodiment, the gray level 0 to 10 is a transition gray level, and the variation of the gamma value in this range is not considered.
As a preferred embodiment, the gamma value corresponding to the set gray scale is greater than 2.4, and it is required to ensure that the gamma value corresponding to the set gray scale is less than or equal to 4 in order to avoid the excessive adjustment amplitude of the target gray scale and the excessive reduction of the brightness in the specific low gray scale range.
In other embodiments, when there is only one binding gray level in the specific low gray level range, the binding gray level is used as the set gray level, and the gamma value corresponding to the set gray level is adjusted to be greater than the target gamma value and the gamma value corresponding to the set gray level is used as the highest gamma value according to the above adjustment method. According to the voltage division characteristic of the gamma circuit, the binding voltage corresponding to the set gray scale is adjusted, so that the gamma value corresponding to each gray scale from the lowest gray scale to the set gray scale range is increased according to the gray scale size sequence, and the gamma value corresponding to each gray scale from the set gray scale to the highest gray scale range is decreased according to the gray scale size sequence.
Further, the method for adjusting a gamma curve of the first embodiment further includes:
step S4: and acquiring the local gamma curve after the gamma value is adjusted.
Specifically, the steps include the steps of:
step S41: measuring a side view gamma curve of the display device after adjusting the gamma.
Specifically, an optical measurement instrument, such as a color analyzer with model CA310, is used to measure the display brightness of the display device at different gray scales from a side view angle, and a corresponding side view gamma curve is drawn according to the measured display brightness and a corresponding gray scale value.
Step S42: and acquiring a local gamma curve according to the side-looking gamma curve.
According to the data of each point on the side-view gamma curve, namely the gray level value and the corresponding brightness value, the gamma value corresponding to each gray level value can be calculated, and according to the obtained gamma value and the corresponding gray level value, the corresponding local gamma curve is drawn.
Step S5: and detecting whether the local gamma curve meets the display requirement, if not, repeating the steps S2 to S3.
Specifically, whether the gamma value corresponding to the set gray scale in the local gamma curve is larger than the target gamma value or not is judged, whether the gamma value corresponding to each gray scale in the range from the lowest gray scale to the set gray scale is increased according to the gray scale size sequence or not is judged, and whether the gamma value corresponding to each gray scale in the range from the set gray scale to the highest gray scale is decreased according to the gray scale size sequence or not is judged. If the three conditions are satisfied at the same time, the local gamma curve is in accordance with the display requirement, and the side-view color cast problem of the liquid crystal display can be improved when the liquid crystal display is driven according to the gray scale voltage generated by each gamma value of the local gamma curve.
If at least one of the three conditions is satisfied, it indicates that the local gamma curve does not satisfy the display requirement, and at this time, the steps S2 to S3 need to be repeated until the local gamma curve satisfies the display requirement.
In the method for adjusting a gamma curve disclosed in this embodiment, the gamma value corresponding to each gray scale in the specific low gray scale range is adjusted to be greater than the target gamma value, and each gamma value corresponding to each gray scale in the specific low gray scale range tends to increase first and then decrease, so that the brightness corresponding to each gray scale in the specific low gray scale range is reduced as a whole, and thus the problem of side view color cast can be effectively solved.
Example two
The method for adjusting a gamma curve according to the second embodiment of the present invention includes steps S1 'to S3':
step S1': and adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value. This step S1' is the same as step S1 in the first embodiment, and will not be described herein.
Step S2': and adjusting the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is smaller than the highest gray scale of the specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is smaller than the highest gray scale in the full gray scale range.
Specifically, the liquid crystal display has a timing control chip, and the timing control chip has a white balance adjustment module for adjusting the gray scale ratio of three primary colors, i.e., the gray scale ratio of RGB. Any gray scale of the liquid crystal display is formed by mixing three primary colors of a certain gray scale. On the premise of ensuring the consistent chromaticity, the gray scale proportion of the three primary colors is adjusted, and then the gray scale brightness can be adjusted.
Further, the method in the first embodiment is firstly utilized to determine the color with the largest gray scale variation, and the gray scale value of the color with the largest gray scale variation is used as the set gray scale. As a preferred embodiment, the gray level is set to 100 gray levels. And then, the white balance module is utilized to adjust the gray scale proportion of the three primary colors of each gray scale in the specific low gray scale range, so that the gamma value corresponding to the set gray scale is greater than the target gamma value.
Step S3': and adjusting the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale so that the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale are increased in the order of the gray scale size, and adjusting the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale so that the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale are decreased in the order of the gray scale size.
Specifically, the white balance module is used for adjusting the gray scale proportion of three primary colors of each gray scale from the lowest gray scale to the set gray scale range so as to adjust the gamma value corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale, so that the gamma value corresponding to each gray scale which is larger than or equal to the lowest gray scale and smaller than the set gray scale is increased according to the gray scale size sequence.
Further, the white balance module is used for adjusting the gray scale proportion of the three primary colors corresponding to each gray scale within the range from the set gray scale to the highest gray scale so as to adjust the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale, so that the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than or equal to the highest gray scale within the specific low gray scale range is reduced according to the gray scale size sequence.
Further, the method for adjusting a gamma curve of the second embodiment further includes:
step S4': and acquiring the local gamma curve after the gamma value is adjusted. This step S4' is the same as step S4 of the first embodiment, and will not be repeated here.
Step S5': and detecting whether the local gamma curve meets the display requirement, if not, repeating the step S2 'to the step S3'. This step S5' is the same as step S5 of the first embodiment, and will not be repeated here.
In the second embodiment of the present invention, the white balance module of the timing controller is used to adjust the gray scale ratios of the three primary colors corresponding to the respective gray scales, so as to achieve accurate adjustment of the gamma values corresponding to the respective gray scales within the specific low gray scale range, thereby reducing the overall brightness within the specific low gray scale range, and thus effectively improving the problem of side-view color cast.
EXAMPLE III
The liquid crystal display according to the third embodiment of the invention comprises a memory and a processor, wherein the memory stores a plurality of instructions, and the instructions are suitable for being loaded by the processor and executing the following steps:
adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value;
adjusting the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, the set gray scale is smaller than the highest gray scale of the specific low gray scale range and is greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is smaller than the highest gray scale in the full gray scale range;
and adjusting the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale so that the gamma values corresponding to the gray scales which are greater than the lowest gray scale and less than the set gray scale are increased according to the gray scale size sequence, and adjusting the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale so that the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale are decreased according to the gray scale size sequence.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents, and that such changes and modifications are intended to be within the scope of the invention.
Claims (10)
1. A method for adjusting a gamma curve, the method comprising:
adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value;
adjusting a gamma value corresponding to a set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is less than the highest gray scale of a specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is less than the highest gray scale in the full gray scale range;
and adjusting gamma values corresponding to gray scales which are larger than the lowest gray scale and smaller than the set gray scale so that the gamma values corresponding to the gray scales which are larger than the lowest gray scale and smaller than the set gray scale are increased according to the gray scale size sequence, and adjusting gamma values corresponding to the gray scales which are larger than the set gray scale and smaller than the highest gray scale in the specific low gray scale range so that the gamma values corresponding to the gray scales which are larger than the set gray scale and smaller than the highest gray scale in the specific low gray scale range are decreased according to the gray scale size sequence.
2. The method of adjusting according to claim 1, wherein the method of adjusting the gamma value corresponding to each gray level in the full gray level range to a target gamma value comprises:
and adjusting each binding point voltage corresponding to the full gray scale range so that the gamma value corresponding to each gray scale in the full gray scale range is adjusted to be the target gamma value.
3. The adjusting method of claim 1, wherein the adjusting the gamma value corresponding to the set gray level to make the gamma value corresponding to the set gray level greater than the target gamma value comprises:
and adjusting the binding point voltage corresponding to the set gray scale to adjust the gamma value corresponding to the set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value.
4. The adjusting method according to claim 3, wherein the method of adjusting the binding voltage corresponding to the set gray level comprises:
reducing the positive polarity binding point voltage corresponding to the set gray scale;
and increasing the negative polarity binding point voltage corresponding to the set gray scale.
5. The adjusting method according to claim 4, wherein the adjustment range for adjusting the positive polarity binding voltage corresponding to the set gray scale is equal to the adjustment range for adjusting the negative polarity binding voltage corresponding to the set gray scale.
6. The adjusting method according to claim 1, wherein adjusting the gamma values corresponding to the gray levels greater than the lowest gray level and less than the set gray level such that the gamma values corresponding to the gray levels greater than the lowest gray level and less than the set gray level increase in gray level order comprises: adjusting each binding point voltage corresponding to a gray scale range which is greater than or equal to the lowest gray scale and less than the set gray scale so as to adjust a gamma value corresponding to each gray scale which is greater than the lowest gray scale and less than the set gray scale, so that the gamma value corresponding to each gray scale which is greater than the lowest gray scale and less than the set gray scale is increased according to the gray scale size sequence;
the method for adjusting the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale so that the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale is reduced according to the gray scale sequence comprises the following steps: and adjusting the binding point voltages corresponding to the gray scale ranges which are greater than the set gray scale and less than the highest gray scale so as to adjust the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale, so that the gamma values corresponding to the gray scales which are greater than the set gray scale and less than the highest gray scale are reduced according to the gray scale size sequence.
7. The adjusting method of claim 1, wherein the adjusting the gamma value corresponding to the set gray level to make the gamma value corresponding to the set gray level greater than the target gamma value comprises:
and adjusting the gray scale values of the three primary colors corresponding to the gray scales of the specific low gray scale range to adjust the gamma values corresponding to the set gray scales so that the gamma values corresponding to the set gray scales are greater than the target gamma value.
8. The adjusting method according to claim 1, wherein the adjusting the gamma value corresponding to each gray level greater than the lowest gray level and less than the set gray level such that the gamma value corresponding to each gray level greater than the lowest gray level and less than the set gray level increases in gray level order comprises: adjusting gray scale proportion of three primary colors corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale to adjust gamma values corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale, so that the gamma values corresponding to each gray scale which is larger than the lowest gray scale and smaller than the set gray scale are increased according to the gray scale size sequence;
the method for adjusting the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale so that the gamma value corresponding to each gray scale which is greater than the set gray scale and less than the highest gray scale is reduced according to the gray scale sequence comprises the following steps: and adjusting the gray scale proportion of the three primary colors corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale so as to adjust the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale, so that the gamma value corresponding to each gray scale which is larger than the set gray scale and smaller than the highest gray scale is reduced according to the gray scale sequence.
9. The method of any one of claims 1 to 8, wherein the gamma value corresponding to the set gray level is greater than 2.4 and less than or equal to 4.
10. A liquid crystal display comprising a memory and a processor, the memory storing a plurality of instructions adapted to be loaded by the processor and to perform the steps of:
adjusting the gamma value corresponding to each gray scale in the full gray scale range to a target gamma value;
adjusting a gamma value corresponding to a set gray scale so that the gamma value corresponding to the set gray scale is greater than the target gamma value, wherein the set gray scale is less than the highest gray scale of a specific low gray scale range and greater than the lowest gray scale of the specific low gray scale range, and the highest gray scale in the specific low gray scale range is less than the highest gray scale in the full gray scale range;
and adjusting gamma values corresponding to gray scales which are larger than the lowest gray scale and smaller than the set gray scale so that the gamma values corresponding to the gray scales which are larger than the lowest gray scale and smaller than the set gray scale are increased according to the gray scale size sequence, and adjusting gamma values corresponding to the gray scales which are larger than the set gray scale and smaller than the highest gray scale in the specific low gray scale range so that the gamma values corresponding to the gray scales which are larger than the set gray scale and smaller than the highest gray scale in the specific low gray scale range are decreased according to the gray scale size sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810954231.4A CN109147689B (en) | 2018-08-21 | 2018-08-21 | Liquid crystal display and gamma curve adjusting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810954231.4A CN109147689B (en) | 2018-08-21 | 2018-08-21 | Liquid crystal display and gamma curve adjusting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109147689A CN109147689A (en) | 2019-01-04 |
| CN109147689B true CN109147689B (en) | 2020-12-25 |
Family
ID=64790655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810954231.4A Active CN109147689B (en) | 2018-08-21 | 2018-08-21 | Liquid crystal display and gamma curve adjusting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109147689B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI726296B (en) * | 2019-04-01 | 2021-05-01 | 友達光電股份有限公司 | Adjustment method of display apparatus with dual cell |
| CN110675834B (en) * | 2019-09-25 | 2021-01-01 | 惠州市华星光电技术有限公司 | Design method and system for improving color race complexion visual angle performance |
| CN112951147B (en) * | 2019-12-09 | 2022-06-10 | 深圳Tcl新技术有限公司 | Display chroma and visual angle correction method, intelligent terminal and storage medium |
| CN111415616B (en) | 2020-04-27 | 2021-04-13 | 京东方科技集团股份有限公司 | Method for improving picture display quality, time sequence controller and display device |
| CN111710311B (en) * | 2020-07-01 | 2021-09-03 | 深圳市华星光电半导体显示技术有限公司 | Adjusting method and device of display panel |
| CN112382247A (en) * | 2020-11-05 | 2021-02-19 | 深圳市华星光电半导体显示技术有限公司 | Display device and gamma curve adjusting method thereof |
| CN113299216B (en) * | 2021-05-28 | 2023-01-20 | 昆山国显光电有限公司 | Gamma debugging method, device, equipment and storage medium |
| CN113936596B (en) * | 2021-10-25 | 2023-04-07 | 京东方科技集团股份有限公司 | Gamma debugging method, gamma debugging device, computer equipment and display device |
| CN114220377B (en) * | 2021-12-30 | 2023-06-27 | 合肥维信诺科技有限公司 | Gamma debugging method and device of display module and electronic equipment |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317462B2 (en) * | 2004-03-29 | 2008-01-08 | Vastview Technologies, Inc. | Method for luminance compensation of liquid crystal display and its device |
| TWI271695B (en) * | 2005-03-29 | 2007-01-21 | Chi Mei Optoelectronics Corp | Driving system for color display |
| JP4840412B2 (en) * | 2008-06-26 | 2011-12-21 | ソニー株式会社 | Liquid crystal display |
| TW201027510A (en) * | 2009-01-14 | 2010-07-16 | Chi Mei Optoelectronics Corp | Display module, display apparatus and image adjusting methods thereof |
| KR101990975B1 (en) * | 2012-04-13 | 2019-06-19 | 삼성전자 주식회사 | Gradation voltage generator and display driving apparatus |
| CN103995376A (en) * | 2014-06-12 | 2014-08-20 | 深圳市华星光电技术有限公司 | Pixel black frame insertion method for 3D display and circuit using same |
| CN104952410B (en) * | 2015-07-14 | 2017-07-11 | 深圳市华星光电技术有限公司 | The display ameliorative way and its equipment of liquid crystal panel |
| CN105528999B (en) * | 2016-01-15 | 2018-05-08 | 合一智能科技（深圳）有限公司 | The display control method and device of liquid crystal display |
| CN108053796B (en) * | 2017-12-18 | 2020-04-07 | 惠科股份有限公司 | Display panel driving method and display device |
| CN107967902B (en) * | 2017-12-21 | 2020-03-31 | 惠科股份有限公司 | Display device driving method, driving device and display device |
| CN108335678B (en) * | 2018-01-10 | 2019-09-17 | 惠科股份有限公司 | The driving method and device of display panel |
-
2018
- 2018-08-21 CN CN201810954231.4A patent/CN109147689B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109147689A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109147689B (en) | Liquid crystal display and gamma curve adjusting method thereof | |
| US10839759B2 (en) | Signal processing method and display device | |
| US10446095B2 (en) | Image processing method of display device, image processing structure, and display device | |
| US9601062B2 (en) | Backlight dimming method and liquid crystal display using the same | |
| WO2018113610A1 (en) | Liquid crystal display device and liquid crystal display panel driving method | |
| US10573251B2 (en) | Liquid crystal display device and method for driving the same | |
| WO2018214188A1 (en) | Image processing method, image processing device, and display device | |
| US11270657B2 (en) | Driving method, driving apparatus, display device and computer readable medium | |
| EP3291219A1 (en) | Liquid crystal display device and method of performing local dimming of the same | |
| CN107093410B (en) | Liquid crystal display brightness regulation and control method and device and liquid crystal display screen | |
| CN113077746A (en) | Gamma correction method and device for display panel | |
| CN102467896A (en) | Liquid crystal display and global dimming control method thereof | |
| CN105513559A (en) | Image processing method and display device | |
| US20230205014A1 (en) | Viewing Angle Compensation Method and Apparatus for Display Panel, and Display Panel | |
| WO2020216213A1 (en) | Voltage adjustment method for source electrode, display adjustment method, and computer storage medium | |
| KR100923676B1 (en) | Liquid crystal display and method for improving color gamut thereof | |
| CN113823233A (en) | Display device and control method thereof | |
| US8570316B2 (en) | Liquid crystal display | |
| JP3839024B2 (en) | Color correction method | |
| US20230154425A1 (en) | Method and device for relieving fracture phenomenon of liquid crystal display panel, and display panel | |
| CN108461072B (en) | Method and device for adjusting driving signal of display panel | |
| WO2020097930A1 (en) | Method for displaying image on double-screen display panel, and related device | |
| CN109817145B (en) | Pixel signal conversion method, pixel signal conversion device and display device | |
| CN109817176B (en) | Pixel signal conversion method, pixel signal conversion device and display device | |
| CN113707104B (en) | White balance adjustment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |