CN110136662B - Driving method and driving system of display panel and display device - Google Patents
Driving method and driving system of display panel and display device Download PDFInfo
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- CN110136662B CN110136662B CN201910275213.8A CN201910275213A CN110136662B CN 110136662 B CN110136662 B CN 110136662B CN 201910275213 A CN201910275213 A CN 201910275213A CN 110136662 B CN110136662 B CN 110136662B
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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
- G09G3/34—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
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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
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
Abstract
The application discloses a driving method, a driving system and a display device of a display panel, comprising the following steps: receiving a first color signal, converting the first color signal into a first brightness normalization signal, and converting the first brightness normalization signal to obtain a first hue saturation brightness space signal; dividing the first hue, saturation and brightness space signal into six hue intervals according to different hues; acquiring a preset adjustment coefficient and a tone interval correction value; acquiring a color saturation signal of the first color hue saturation brightness space signal, adjusting the color saturation signal by using an adjusting coefficient and a color hue interval correction value, and acquiring a second color saturation signal to obtain a second color hue saturation brightness space signal; lowering the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal; converting the second brightness normalization signal to obtain a second color signal; driving the display panel using the second color signal; the application effectively improves the color cast problem of the display panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method, a driving system and a display device for a display panel.
Background
With the development and progress of science and technology, the lcd has thin body, low power consumption, low radiation, and other hot spots, and thus is the mainstream product of the lcd and widely used. Most of the lcds are Backlight lcds, which include a liquid crystal panel and a Backlight Module (Backlight Module). The liquid crystal panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, and a driving voltage is applied to the two glass substrates to control the rotation direction of the liquid crystal molecules so as to refract light rays of the backlight module out to generate a picture.
The large-size liquid crystal display panel mostly adopts a VA (Vertical Alignment) liquid crystal technology or an IPS (In-Plane switching) liquid crystal technology, and the VA liquid crystal technology has the advantages of higher production efficiency and lower manufacturing cost compared with the IPS liquid crystal technology, but has a more obvious optical property defect compared with the IPS liquid crystal technology In terms of optical property; namely, some large-sized display panels, especially VA-mode liquid crystal driving, have a color shift problem at a large viewing angle.
Disclosure of Invention
The application aims to provide a driving method, a driving system and a display device of a display panel, which can effectively solve the problem of color cast.
The application discloses a driving method of a display panel, which comprises the following steps:
receiving a first color signal, converting the first color signal into a first brightness normalization signal, and converting according to the first brightness normalization signal to obtain a first hue saturation brightness space signal;
dividing the first hue, saturation and brightness space signal into six hue intervals of a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue according to different hues;
acquiring a preset adjustment coefficient, and acquiring a hue interval correction value according to a hue interval where the first hue saturation brightness space signal is located;
acquiring a color saturation signal of the first color hue color saturation brightness space signal, and adjusting the color saturation signal by using an adjusting coefficient and a color hue interval correction value to acquire a second color saturation signal so as to acquire a second color hue color saturation brightness space signal;
lowering the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal;
converting the second brightness normalization signal to obtain a second color signal;
the display panel is driven using the second color signal.
Optionally, the step of obtaining a color saturation signal of the first color hue color saturation luminance spatial signal, adjusting the color saturation signal by using an adjustment coefficient and a color hue interval correction value, and obtaining a second color saturation signal includes: the color saturation signal s is calculated to obtain a transitional color saturation signal s' according to the adjustment coefficient; and calculating the transitional color saturation signal s 'and the color saturation signal s according to the hue interval correction value to obtain a second color saturation signal s'.
Optionally, the step of calculating the transition color saturation signal s' according to the adjustment coefficient includes: the color saturation signal s obtains a transition color saturation signal s 'through calculation, and the transition color saturation signal s' meets the following formula: s' ═ a × s4+b×s3+c×s2+ dxs + e; it is composed ofWherein s is a color saturation signal and s' is a transition color saturation signal; and a, b, c, d and e are adjustment coefficients and are constants.
Optionally, the step of calculating the second color saturation signal s ″ by the transitional color saturation signal s' and the color saturation signal s according to the hue interval correction value includes: the transition color saturation signal s 'and the color saturation signal s are calculated according to the following formula to obtain a second color saturation signal s': s ═ s + (s' -s) × H factor; wherein s is a color saturation signal, s 'is a transition color saturation signal, s' is a second color saturation signal, and the H factor follows the following formula:
optionally, the step of calculating the second color saturation signal s ″ by the transitional color saturation signal s' and the color saturation signal s according to the hue interval correction value includes: the transition color saturation signal s 'and the color saturation signal s are calculated according to the following formula to obtain a second color saturation signal s': s ═ s + (s' -s) × H factor; wherein s is a color saturation signal, s 'is a transition color saturation signal, s' is a second color saturation signal, and the H factor follows the following formula:
optionally, the tone interval correction values have a different weighting coefficient a respectively in different tone intervals; when the hue interval in which the first hue saturation luminance space signal is located is judged, and when the hue interval in which the first hue saturation luminance space signal is located is a red hue interval, a green hue interval, a blue hue interval, a yellow hue interval, a cyan hue interval or a magenta hue interval, respectively, the weights to be multiplied by the hue interval correction value are Ared、Agreen、Ablue、Ayellow、AcyanOr Ameganta(ii) a A hue interval corresponding to a red hue interval, a green hue interval, a blue hue interval, a yellow hue interval, a cyan hue interval, or a magenta hue intervalCorrection value of H factor × Ared、H factor×Agreen、H factor ×Ablue、H factor×Ayellow、H factor×AcyanOr H factor xAmegantaWherein at least the red tone section correction value hfactor × aredIs larger than the correction value Hfactor multiplied by A of the green hue intervalgreen。
Optionally, when the hue H value of the current color saturation signal s satisfies the hue interval of the following formula, the adjustment hue interval is divided into: the hue interval in which the hue satisfies the following formula is a red hue interval: h is more than or equal to 340 and less than or equal to 20; the hue range in which the hue value satisfies the following formula is a yellow hue range: h is more than or equal to 40 and less than or equal to 80; the hue range in which the hue value satisfies the following formula is a green hue range: h is more than or equal to 100 and less than or equal to 140; the hue range in which the hue value satisfies the following formula is a cyan hue range: h is more than or equal to 160 and less than or equal to 200; the hue range in which the hue value satisfies the following formula is a blue hue range: h is more than or equal to 220 and less than or equal to 260; the hue range whose hue value satisfies the following formula is a magenta hue range: h is more than or equal to 280 and less than or equal to 320. When the hue H value of the current color saturation signal s meets the hue interval of the following formula, dividing the current color saturation signal s into non-adjustment hue intervals: 20< H <40, 80< H <100, 140< H <160, 200< H <220, 260< H <280, or 320< H < 340.
Optionally, when the hue H value of the current color saturation signal s satisfies the hue interval of the following formula, the adjustment hue interval is divided into: h is more than or equal to 330 and less than or equal to 30, H is more than or equal to 30 and less than or equal to 90, H is more than or equal to 90 and less than or equal to 150, H is more than or equal to 150 and less than or equal to 210, H is more than or equal to 210 and less than or equal to 270, or H is more than or equal to 270 and less than or equal to 330.
The application also discloses a driving system using the driving method of the display panel, which comprises a receiving module, a dividing module, an adjusting module, an obtaining module, a calculating module, a converting module and a driving module; the receiving module receives a first color signal, converts the first color signal into a first brightness normalization signal, and converts the first brightness normalization signal into a first hue saturation brightness space signal; the dividing module divides the first hue, saturation and brightness space signal into six hue intervals of a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue according to different hues; the adjusting module obtains a preset adjusting coefficient and obtains a tone interval correction value according to a tone interval where the first tone saturation brightness space signal is located; the acquisition module acquires a color saturation signal of the first color hue saturation brightness space signal, adjusts the color saturation signal by using an adjustment coefficient and a color hue interval correction value, and acquires a second color saturation signal to obtain a second color hue saturation brightness space signal; the calculation module reduces the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal; the conversion module converts the second brightness normalization signal to obtain a second color signal; the driving module drives the display panel by using the second color signal.
The application also discloses a display device, which comprises the driving system of the display panel and the display panel.
In red, green and blue systems, color cast is more serious due to more mixed color components except for the dominant hue; the color mixing proportion is reduced by reducing the minimum value in the first brightness normalization signal, so that the aim of improving the color saturation is fulfilled; therefore, the pixels do not need to be divided into the main pixels and the sub-pixels, the purity of the main tone is improved, the color cast problem of the display panel is improved, the color of the display panel is more gorgeous, the aperture opening ratio of the display panel is not sacrificed, and the condition that the light transmittance of the display panel is reduced is effectively avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic diagram of color shift variation of large viewing angle and front viewing angle of various representative color systems in a liquid crystal display panel;
FIG. 2 is a first comparative schematic diagram of indistinguishable primary and secondary pixels and distinguishable primary and secondary pixels;
FIG. 3 is a second comparative schematic diagram of indistinguishable primary and secondary pixels;
FIG. 4 is a schematic diagram of a display device according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a system for driving a display surface according to an embodiment of the present application;
fig. 6 is a flowchart of a driving method of a display panel according to an embodiment of the present application;
FIG. 7 is a schematic illustration of a tonal representation according to an embodiment of the present application;
FIG. 8 is a schematic illustration of a color saturation signal and a second color saturation signal variation for an embodiment of the present application;
FIG. 9 is a schematic diagram of changes in hue and hue interval correction values according to an embodiment of the present application;
FIG. 10 is a schematic diagram of the variation of the hue and hue interval correction values according to another embodiment of the present application;
FIG. 11 is a schematic diagram of a variation of a color difference between a color saturation signal and a second color saturation signal of an embodiment of the present application;
FIG. 12 is a schematic diagram of a variation of color difference for different colors of a color saturation signal and a second color saturation signal in an embodiment of the present application.
100, a display device; 200. a drive system; 300. a display panel; 210. a receiving module; 220. a dividing module; 230. an adjustment module; 240. the device comprises an acquisition module, 250, a calculation module, 260, a conversion module, 270 and a driving module.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The large-sized liquid crystal display panel mostly adopts a negative VA (Vertical Alignment) liquid crystal technology or an IPS (In-plane Switch) liquid crystal technology, and the VA liquid crystal technology has the advantages of higher production efficiency and lower manufacturing cost compared with the IPS liquid crystal technology, but has a defect of more obvious optical property compared with the IPS liquid crystal technology In terms of optical property, and particularly, the large-sized panel needs a larger viewing angle In terms of commercial application.
FIG. 1 is a schematic diagram of color shift variation of large viewing angle and front viewing angle of various representative color systems in a liquid crystal display panel; as shown in fig. 1, when the hue is close to the R (red), G (green), and B (blue) 0 pure hues, the color shift deterioration observed at the viewing angle is more significant, and when the hue is close to R, G, B pure hues, the color shift phenomenon becomes more significant, because R, G, B pure hues have other color components.
An exemplary solution is to subdivide the RGB Sub-pixels into primary and secondary (Main/Sub) pixels so that the overall large-view luminance is closer to front view as the voltage varies. Fig. 2 is a schematic diagram of a first comparison without distinguishing primary and secondary pixels, and fig. 3 is a schematic diagram of a second comparison without distinguishing primary and secondary pixels, as can be seen with reference to fig. 2 and 3, wherein x, y and z coordinates represent three directions of a three-dimensional space, respectively; θ a denotes the pretilt angle at which the main pixel has a large voltage, and θ B denotes the pretilt angle at which the sub pixel has a small voltage. In fig. 3, the abscissa is a gray scale signal, and the ordinate is a luminance signal, and at a large viewing angle, the luminance is rapidly saturated with the signal, which causes a color shift problem (a left arc segment in fig. 3) at the large viewing angle, and the problem can be improved to a certain extent by distinguishing the primary and secondary pixels.
The ratio of brightness change corresponding to high-voltage side-view angle voltage in the liquid crystal display is easier to be saturated, so that an original signal can be divided into a large voltage and a small voltage to be seen as a graph shown in figure 3, the front-view large voltage and the small voltage are used for maintaining the change of the original front-view signal along with the brightness, the side-view brightness seen by the large voltage changes along with the gray scale as a Part A in figure 3, the side-view brightness seen by the small voltage changes along with the gray scale as a Part B in figure 3, and thus the brightness seen by the side-view synthesis is closer to the relation that the front-view brightness changes along with the gray scale, so that the relation of the visual angle brightness along with the signal changes is close to the relation that the front-view original signal brightness changes along with the signal, and the visual angle is improved.
The defect of color deviation of visual angles is solved by applying different driving voltages to the main pixel and the sub-pixel on the space, so that the design of the pixel usually needs to design a metal wire or a TFT element to drive the sub-pixel, the light-permeable opening area is sacrificed, the penetration rate of a panel is influenced, and the backlight cost is directly improved.
The present application is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 4, the present application discloses a display device 100 including a display panel 300 and a driving system 200 of the display panel 300.
As shown in fig. 5, the present application further discloses a driving system 200 of a display panel 300, comprising: a receiving module 210, a dividing module 220, an adjusting module 230, an obtaining module 240, a calculating module 250, a converting module 260 and a driving module 270; the receiving module 210 receives the first color signal, converts the first color signal into a first brightness normalization signal, and obtains a first hue saturation brightness space signal according to the first brightness normalization signal; the dividing module 220 divides the first hue, saturation and brightness space signal into six hue intervals, namely a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue, according to different hues; the adjusting module 230 obtains a preset adjusting coefficient, and obtains a hue interval correction value according to a hue interval where the first hue saturation brightness space signal is located; the obtaining module 240 obtains a color saturation signal of the first color hue saturation luminance spatial signal, and adjusts the color saturation signal by using an adjustment coefficient and a color hue interval correction value to obtain a second color saturation signal so as to obtain a second color hue saturation luminance spatial signal; the calculating module 250 reduces the minimum value in the first luminance normalization signal according to the second hue saturation luminance spatial signal to obtain a second luminance normalization signal; the conversion module 260 converts the second luminance normalization signal to obtain a second color signal; the driving module 270 drives the display panel 100 using the second color signal.
Correspondingly, as shown in fig. 6, the present application further discloses a driving method for driving the display panel, including the steps of:
s1: receiving a first color signal, converting the first color signal into a first brightness normalization signal, and converting according to the first brightness normalization signal to obtain a first hue saturation brightness (HSV) space signal;
s2: dividing the first hue, saturation and brightness space signal into six hue intervals of a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue according to different hues;
s3: acquiring a preset adjustment coefficient, and acquiring a hue interval correction value according to a hue interval where the first hue saturation brightness space signal is located;
s4: acquiring a color saturation signal of the first color hue color saturation brightness space signal, and adjusting the color saturation signal by using an adjusting coefficient and a color hue interval correction value to acquire a second color saturation signal so as to acquire a second color hue color saturation brightness space signal;
s5: lowering the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal;
s6: converting the second brightness normalization signal to obtain a second color signal;
s7: the display panel is driven using the second color signal.
In the RGB color system, because of more mixed color components except the main tone, the color cast is more serious; the color mixing proportion is reduced by reducing the minimum value in the first brightness normalization signal, so that the color saturation is improved, namely the purity of the dominant hue is improved, and the color of the display panel is more gorgeous; therefore, the pixels do not need to be divided into the main pixels and the sub-pixels, the color cast problem of the display panel can be improved on the premise of not sacrificing the aperture opening ratio of the display panel, and the condition that the light transmittance of the display panel is reduced is effectively avoided; the color saturation is adjusted by using a scheme of combining the adjustment coefficient and the correction value of the hue interval, so that the adjustment of the color saturation can be more targeted and more accurate, and the adjustment result is more favorable for improving the image display effect of the display panel.
The present application considers all hues of 0 ° to 360 °, when uniformly divided, i.e., divided into six hues of red, green, blue, yellow, cyan, and magenta (rgbbyc), corresponding to the first hue, the second hue, the third hue, the fourth hue, the fifth hue, and the sixth hue, respectively; the three hues of yellow, cyan and magenta are just mixed hues of two hues of the three primary colors of red, green and blue.
The step S4 of obtaining the color saturation signal of the first hue color saturation luminance space signal, adjusting the color saturation signal using the adjustment coefficient and the hue interval correction value, and obtaining the second color saturation signal includes: the color saturation signal s is calculated to obtain a transitional color saturation signal s' according to the adjustment coefficient; and calculating the transitional color saturation signal s 'and the color saturation signal s according to the hue interval correction value to obtain a second color saturation signal s'. The color saturation signal s is completely adjusted to obtain a transition color saturation signal s ', and then the transition color saturation signal s' is calculated through the hue interval correction value to obtain a second color saturation signal s ″, so that the adjustment of the hue color saturation can be more accurate through the correction of the hue interval correction value, and the display effect of the picture is better.
As shown in fig. 7, H is a hue, and different hue color representations are represented by 0 ° to 360 °, where 0 ° is defined as red, 120 ° as green, and 240 ° as blue. The step S1 of receiving the first color signal, converting the first color signal into a first luminance normalization signal, and converting the first luminance normalization signal to obtain a first hue saturation luminance spatial signal includes: inputting a first color signal into a gray scale digital signal; converting the gray scale digital signals to obtain first brightness normalization signals r, g and b; wherein, R ═ R/255 ^ gamma R, G ^ gamma G, B ^ B, (B/255) gamma B, gamma R, gamma G, gamma B are gamma signals; the step of obtaining a color saturation signal for the first color hue saturation luminance space signal comprises: the formula for converting the first brightness normalization signal into hue and saturation is as follows:
wherein max represents the maximum value of r/g/b, and min represents the minimum value of r/g/b. The first color signal calculates a first brightness normalization signal through a formula, the maximum value max and the minimum value min in the first brightness normalization signal are obtained through comparison, and the hue H and the saturation signal s are calculated through the formula.
The step S5 of dimming the minimum value in the first luminance normalization signal according to the second hue saturation luminance spatial signal to obtain a second luminance normalization signal includes: when the dominant hue is red, max is r; determining the smaller value of the first brightness normalization signals g and b corresponding to the green and the blue as the minimum value of the first brightness normalization signals; when the dominant hue is green, max is g; determining the smaller value of the first brightness normalization signals r and g corresponding to the red and the blue as the minimum value of the first brightness normalization signals; when the dominant hue is blue, max is b; and determining the smaller value of the first brightness normalization signals r and g corresponding to the red and the green as the minimum value of the first brightness normalization signals. In detail, for example, when the dominant hue is blue, max in r, g and b can be determined as b, so that max does not need to be calculated additionally, and only the smaller value of r and g needs to be calculated as min, so that in the case of reducing the calculation amount, min is reduced to reduce the mixed color component, thereby reducing the color cast of the front view and the side view of the display panel; the G, R color component in the B hue exists, the light leakage amount of the G, R component at a large viewing angle is more obvious compared with the front viewing angle, and the color shift of the B main hue after color mixing is generated. According to the scheme, G, R color components are reduced, the influence of large-viewing-angle G, R light leakage on the main hue B is reduced, viewing-angle color cast is reduced, the color purity of the main hue B is improved, and the color vividness is improved; the other colors are the same.
As shown in fig. 8, the step of calculating and obtaining the intermediate color saturation signal s' according to the adjustment coefficients for all the color saturation signals s includes: the color saturation signal s is calculated to obtain a transitional color saturation signals' satisfies the following formula: s' ═ a × s4+b×s3+c×s2+ dxs + e; wherein s is a color saturation signal and s' is a transition color saturation signal; and a, b, c, d and e are adjustment coefficients and are constants. According to the difference of the hues, the constant values a, b, c, d and e can be changed, and further the transition color saturation signal s' calculated by the color saturation signal s through a formula is also different, so that the adaptability adjustment of the color saturation is realized.
As shown in fig. 9, the step of calculating the second color saturation signal s ″ by the transition color saturation signal s' and the color saturation signal s according to the hue interval correction value includes: the transition color saturation signal s 'and the color saturation signal s are calculated according to the following formula to obtain a second color saturation signal s': s ═ s + (s' -s) × H factor; wherein s is a color saturation signal, s 'is a transition color saturation signal, s' is a second color saturation signal, and the H factor follows the following formula:
after the color saturation signal s is converted into the transition color saturation signal s', the coarse adjustment is completed, and because the closer the color saturation signal s is to the dominant hue in the same hue interval, the more serious the color cast problem is, the closer the hue correction value is to the dominant hue, the larger the hue correction value is, and at the moment, the amplitude of the coarse adjustment is close to the adjustment target, so that the adjustment result of the coarse adjustment is hardly changed during the fine adjustment; correspondingly, when the color cast problem of the HSV color space is very light, the adjustment amplitude of the coarse adjustment is too large, so that the adjustment amplitude can be alleviated by multiplying a smaller hue correction value, the loss of color saturation is avoided as much as possible under the condition of improving the color cast problem, the adjustment of color saturation signals is more accurate, and the adjustment of the color saturation signals in different degrees can be realized aiming at the hue interval ranges with different color cast degrees.
As shown in fig. 10, in an embodiment, the step of calculating the second color saturation signal s ″ according to the hue interval correction value by the transition color saturation signal s' and the color saturation signal s includes: intermediate color saturation signal s' and color saturationThe signal s is calculated to obtain a second color saturation signal s "according to the following formula: s ═ s + (s' -s) × H factor; wherein s is a color saturation signal, s 'is a transition color saturation signal, s' is a second color saturation signal, and the H factor follows the following formula:
after the color saturation signal s is converted into the transition color saturation signal s ', in order to enable the adjustment of the color saturation signal to be more accurate, the adjustment of the color saturation signal of different degrees can be achieved for hue interval ranges with different color cast degrees, and the s ' is further converted into the s ' according to the hue interval correction value H factor, so that the accurate adjustment of different color cast degrees is achieved.
The color tone dividing interval comprises six color tone intervals needing to be adjusted and also comprises a non-adjusted color tone interval; wherein the six hue intervals include: the first tone, the second tone, the third tone, the fourth tone, the fifth tone and the sixth tone. Judging whether the color tone is in six color tone intervals of a first color tone, a second color tone, a third color tone, a fourth color tone, a fifth color tone and a sixth color tone, if so, calculating according to the adjustment coefficient and the correction value of the color tone interval to obtain a correction adjustment coefficient; if not, not adjusting the color saturation; adjusting the color saturation signal s by using an adjusting coefficient to obtain a second color saturation signal s'; wherein, the correction adjustment coefficient is obtained by looking up a table.
According to the method, when the six hue intervals are solved, the color saturation signal s is improved to the transition color saturation signal s ', the second color saturation signal s ' is obtained through the hue interval correction value, the hue interval correction value maintains the hue with the improved saturation, and the color mixing in the six hue intervals does not adjust the saturation signals s to s ', maintains the original saturated color, and reduces the influence on the image quality color.
The hue interval is judged firstly, then the adjustment coefficient and the hue interval correction value are calculated to obtain a correction adjustment coefficient, and then the color saturation signal s is adjusted to be a second color saturation signal s 'through the correction adjustment coefficient, so that for the color saturation signal s which is not in the interval range, the step of adjusting the color saturation signal s to be s' through the adjustment coefficient is not needed, and the calculated amount is greatly reduced; and when the color tone interval correction value is calculated, the color saturation signal s' which is not in the interval and is not adjusted does not need to be corrected and adjusted. The specific implementation example of the scheme is as follows: assuming that the adjustment coefficient is 1.1 and the correction value of the red hue interval is 0.8, the correction adjustment coefficient is preferentially calculated for the color saturation signal s in the red hue interval as follows: the correction adjustment coefficient is then calculated with the color saturation signal s, so as to obtain a second color saturation signal s ″.
Under different tone intervals, the tone interval correction value has a different weight coefficient A respectively; when the hue interval in which the first hue saturation luminance space signal is located is judged, and when the hue interval in which the first hue saturation luminance space signal is located is a red hue interval, a green hue interval, a blue hue interval, a yellow hue interval, a cyan hue interval or a magenta hue interval, respectively, the weights to be multiplied by the hue interval correction value are Ared、 Agreen、Ablue、Ayellow、AcyanOr Ameganta；
The tone section correction value corresponding to the red tone section, the green tone section, the blue tone section, the yellow tone section, the cyan tone section or the magenta tone section is H factor xAred、H factor×Agreen、H factor×Ablue、H factor×Ayellow、H factor ×AcyanOr H factor xAmegantaWherein at least the red tone section correction value hfactor × aredIs larger than the correction value Hfactor multiplied by A of the green hue intervalgreen(ii) a The weights are derived from a look-up table. The larger the H factor is, and the larger the weight A is, the larger the numerical value of the tone interval correction value is, the larger the adjustment amplitude is, so that the improvement amplitude of the color saturation corresponding to a certain dominant tone is larger. The weight a varies depending on the hue. From FIG. 1, red can be seen visuallyThe color cast of the pure color tone is obviously larger than that of the green color tone, and the correction value of the red color tone interval is larger than that of the green color tone interval in the scheme, so that the red color tone can be adjusted more greatly than that of the green color tone, and the color cast degrees of the two color tones are nearly consistent while being improved.
As shown in fig. 9, the function of Hue is an outward decreasing function centered on R Hue ═ 0, Y Hue ═ 60, G Hue ═ 120, C Hue ═ 180, B Hue ═ 240, and M Hue ═ 300; when the hue H value of the current color saturation signal s meets the hue interval of the following formula, dividing the current color saturation signal s into adjustment hue intervals: the hue interval in which the hue satisfies the following formula is a red hue interval: h is more than or equal to 340 and less than or equal to 20; the hue range in which the hue value satisfies the following formula is a yellow hue range: h is more than or equal to 40 and less than or equal to 80; the hue range in which the hue value satisfies the following formula is a green hue range: h is more than or equal to 100 and less than or equal to 140; the hue range in which the hue value satisfies the following formula is a cyan hue range: h is more than or equal to 160 and less than or equal to 200; the hue range in which the hue value satisfies the following formula is a blue hue range: h is more than or equal to 220 and less than or equal to 260; the hue range whose hue value satisfies the following formula is a magenta hue range: h is more than or equal to 280 and less than or equal to 320.
When the hue H value of the current color saturation signal s meets the hue interval of the following formula, dividing the current color saturation signal s into non-adjustment hue intervals: 20<H<40、80<H<100、140<H<160、200<H<220、 260<H<280 or 320<H<340. According to a functional formula:
h factor is 1 when R Hue is 0, Y Hue is 60, G Hue is 120, C Hue is 180, B Hue is 240, or M Hue is 300. Here, Hue represents Hue, and H represents abbreviation of Hue.
As shown in fig. 10, in one embodiment, the function of Hue is an outward decreasing function centered at R Hue 0, Y Hue 60, G Hue 120, C Hue 180, B Hue 240, and M Hue 300; when the Hue value of the current color saturation signal s satisfies the Hue interval of the following formula, dividing the Hue interval into adjustment Hue intervals: when the hue H value of the current color saturation signal s meets the hue interval of the following formula, dividing the current color saturation signal s into adjustment hue intervals: h is more than or equal to 330 and less than or equal to 30H is more than or equal to 30 and less than or equal to 90, H is more than or equal to 90 and less than or equal to 150, H is more than or equal to 150 and less than or equal to 210, H is more than or equal to 210 and less than or equal to 270, or H is more than or equal to 270 and less than or equal to 330. According to a functional formula:
h factor is 1 when R Hue is 0, Y Hue is 60, G Hue is 120, C Hue is 180, B Hue is 240, or M Hue is 300. Here, Hue represents Hue, and H represents abbreviation of Hue.
FIG. 11 is a schematic diagram of a variation of color difference between a color saturation signal and a second color saturation signal;
FIG. 12 is a schematic diagram of a variation of color differences for different colors of a color saturation signal and a second color saturation signal; as shown in fig. 11 and 12, in an embodiment, the second luminance normalization signal is inversely derived from the second saturation signal; and then converting the second brightness normalization signal into a second color signal, wherein the formula is as follows: r '255 × (R')1/γr、G’＝255×(g’)1/γg、B’＝255×(b’)1/γbAnd the second color signal drives the display panel.
The application also discloses another embodiment, which receives the three primary colors of red, green and blue signals R, G and B, and the three primary colors of red, green and blue signals R, G and B are according to the formula: converting the gamma signal into a first brightness normalization signal R, G and B, wherein R ═ R/255 ^ gamma R, G ^ gamma G, G ^ G, and B ^ gamma B (B/255) ^ gamma B, and gamma R, gamma G and gamma B are gamma signals; converting according to the first brightness normalization signal r, g, b to obtain a first hue saturation brightness space signal;
dividing the first hue saturation brightness space signal into six hue intervals according to different hues, namely a red hue interval: 340< H, H <20, green hue interval: 100< H <140, blue hue interval 220< H <260, yellow hue interval 40< H <80, cyan hue interval 160< H <200, and magenta hue interval: 280< H < 320; according to the difference of the hue intervals, the color saturation signal s of the first hue color saturation brightness space signal is obtained through the following formula:
acquiring preset adjustment coefficients a, b, c, d and e and a hue interval correction value H factor according to a hue interval where the hue of the first hue, color saturation and brightness space signal is located; wherein the hue interval correction value hfactor is obtained by the following equation:
wherein max represents the maximum value in r/g/b, and min represents the minimum value in r/g/b; and adjusting the color saturation signal s by using the adjustment coefficients a, b, c, d and e to obtain a transitional color saturation signal s', wherein the formula is as follows: s' ═ a × s4+b×s3+c×s2+d×s+e；
And adjusting the color saturation signal s through the hue interval correction value H factor to obtain a second color saturation signal s ", wherein the formula is as follows: s ═ s + (s' -s) × H factor, and then a second hue color saturation luminance spatial signal is obtained;
reducing the minimum value in the first brightness normalization signal according to the second hue saturation brightness spatial signal to obtain second brightness normalization signals r ', g ' and b '; the second luminance normalization signals r ', g ', b ' are according to the formula: r '255 × (R')1/γr、G’＝255×(g’)1/γg、B’＝255×(b’)1/γbConverting the signal into second red, green and blue three primary color signals R ', G ' and B '; the display panel is driven using the second three primary color signals R ', G ', B '.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A method of driving a display panel, comprising the steps of:
receiving a first color signal, converting the first color signal into a first brightness normalization signal, and converting according to the first brightness normalization signal to obtain a first hue saturation brightness space signal;
dividing the first hue, saturation and brightness space signal into six hue intervals of a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue according to different hues;
acquiring a preset adjustment coefficient, and acquiring a hue interval correction value according to a hue interval where the first hue saturation brightness space signal is located;
acquiring a color saturation signal of the first color hue color saturation brightness space signal, and adjusting the color saturation signal by using an adjusting coefficient and a color hue interval correction value to acquire a second color saturation signal so as to acquire a second color hue color saturation brightness space signal;
lowering the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal;
converting the second brightness normalization signal to obtain a second color signal; and
driving the display panel using the second color signal;
wherein the step of lowering the minimum value in the first luminance normalization signal according to the second hue saturation luminance spatial signal to obtain a second luminance normalization signal comprises:
when the dominant hue is red, max is r; determining the smaller value of the first brightness normalization signals g and b corresponding to the green and the blue as the minimum value of the first brightness normalization signals;
when the dominant hue is green, max is g; determining the smaller value of the first brightness normalization signals r and g corresponding to the red and the blue as the minimum value of the first brightness normalization signals;
when the dominant hue is blue, max is b; and determining the smaller value of the first brightness normalization signals r and g corresponding to the red and the green as the minimum value of the first brightness normalization signals.
2. The method for driving a display panel according to claim 1, wherein the step of obtaining a color saturation signal of the first color hue color saturation luminance space signal, and adjusting the color saturation signal using an adjustment coefficient and a color hue interval correction value to obtain a second color saturation signal comprises:
the color saturation signal s is calculated to obtain a transitional color saturation signal s' according to the adjustment coefficient;
and calculating the transitional color saturation signal s 'and the color saturation signal s according to the hue interval correction value to obtain a second color saturation signal s'.
3. The method for driving a display panel according to claim 2, wherein the step of calculating the intermediate color saturation signal s 'based on the color saturation signal s' all according to the adjustment coefficient comprises:
the color saturation signal s obtains a transition color saturation signal s 'through calculation, and the transition color saturation signal s' meets the following formula:
s'＝a×s4+b×s3+c×s2+d×s+e；
wherein s is a color saturation signal and s' is a transition color saturation signal; and a, b, c, d and e are adjustment coefficients and are constants.
4. A method for driving a display panel according to claim 3, wherein the step of calculating the second color saturation signal s "from the intermediate color saturation signal s' and the color saturation signal s based on the hue interval correction value comprises:
the transition color saturation signal s 'and the color saturation signal s are calculated according to the following formula to obtain a second color saturation signal s':
s”＝s+(s’-s)×H factor；
wherein s is a color saturation signal, s 'is a transition color saturation signal, s' is a second color saturation signal, and the H factor follows the following formula:
where H is the hue value.
5. A method for driving a display panel according to claim 3, wherein the step of calculating the second color saturation signal s "from the intermediate color saturation signal s' and the color saturation signal s based on the hue interval correction value comprises:
the transition color saturation signal s 'and the color saturation signal s are calculated according to the following formula to obtain a second color saturation signal s':
s”＝s+(s’-s)×Hfactor；
wherein s is a color saturation signal, s 'is a transition color saturation signal, and s' is a second color saturation signal H factor, following the following formula:
6. The method according to any one of claims 4 or 5, wherein the tone section correction values have a different weight coefficient A for different tone sections;
when the hue interval where the first hue saturation brightness space signal is located is judged, and when the hue interval where the first hue saturation brightness space signal is located is a red hue interval, a green hue interval, a blue hue interval, a yellow hue interval, a cyan hue interval or a magenta hue interval, the weights which are required to be multiplied by the hue interval correction value are Ared, Agreen, Ablue, Ayellow, Acyan or Ameganta respectively;
the tone section correction value corresponding to a red tone section, a green tone section, a blue tone section, a yellow tone section, a cyan tone section, or a magenta tone section is H factor × arc, H factor × agenen, H factor × Ablue, H factor × ayelow, H factor × Acyan, or H factor × amegmata, wherein at least the red tone section correction value H factor × arad is larger than the green tone section correction value H factor × agenen.
7. The method for driving a display panel according to any one of claims 1 or 4, wherein when the hue H value of the current color saturation signal s satisfies a hue interval of the following formula, the division into adjustment hue intervals is performed:
the hue interval in which the hue satisfies the following formula is a red hue interval: h is more than or equal to 340 and less than or equal to 20;
the hue range in which the hue value satisfies the following formula is a yellow hue range: h is more than or equal to 40 and less than or equal to 80;
the hue range in which the hue value satisfies the following formula is a green hue range: h is more than or equal to 100 and less than or equal to 140;
the hue range in which the hue value satisfies the following formula is a cyan hue range: h is more than or equal to 160 and less than or equal to 200; the hue range in which the hue value satisfies the following formula is a blue hue range: h is more than or equal to 220 and less than or equal to 260;
the hue range whose hue value satisfies the following formula is a magenta hue range: h is more than or equal to 280 and less than or equal to 320;
when the hue H value of the current color saturation signal s meets the hue interval of the following formula, dividing the current color saturation signal s into non-adjustment hue intervals: 20< H <40, 80< H <100, 140< H <160, 200< H <220, 260< H <280, or 320< H < 340.
8. The method for driving a display panel according to any one of claims 1 or 5, wherein when the hue H value of the current color saturation signal s satisfies a hue interval of the following formula, the division into adjustment hue intervals is performed: h is more than or equal to 330 and less than or equal to 30, H is more than or equal to 30 and less than or equal to 90, H is more than or equal to 90 and less than or equal to 150, H is more than or equal to 150 and less than or equal to 210, H is more than or equal to 210 and less than or equal to 270, or H is more than or equal to 270 and less than or equal to 330.
9. A driving system of a display panel using the driving method of a display panel according to any one of claims 1 to 8, comprising:
the receiving module is used for receiving the first color signal, converting the first color signal into a first brightness normalization signal and converting the first brightness normalization signal into a first color hue saturation brightness space signal;
the dividing module is used for dividing the first hue, saturation and brightness space signal into six hue intervals of a first hue, a second hue, a third hue, a fourth hue, a fifth hue and a sixth hue according to different hues;
the adjusting module is used for acquiring a preset adjusting coefficient and obtaining a tone interval correction value according to a tone interval where the first tone saturation brightness space signal is located;
the acquisition module is used for acquiring a color saturation signal of the first color hue saturation brightness space signal, adjusting the color saturation signal by using an adjustment coefficient and a color hue interval correction value, and acquiring a second color saturation signal to obtain a second color hue saturation brightness space signal;
the calculation module is used for reducing the minimum value in the first brightness normalization signal according to the second hue saturation brightness space signal to obtain a second brightness normalization signal;
the conversion module is used for obtaining a second color signal according to the second brightness normalization signal; and
and the driving module drives the display panel by using the second color signal.
10. A display device comprising the display panel and a driving system for the display panel according to claim 9.
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