CN102136255B - Method and device for compensating colors of backlight - Google Patents
Method and device for compensating colors of backlight Download PDFInfo
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- CN102136255B CN102136255B CN 201010102573 CN201010102573A CN102136255B CN 102136255 B CN102136255 B CN 102136255B CN 201010102573 CN201010102573 CN 201010102573 CN 201010102573 A CN201010102573 A CN 201010102573A CN 102136255 B CN102136255 B CN 102136255B
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Abstract
The invention provides a method and a device for compensating colors of a backlight. The method comprises the following steps of: receiving an image signal; and regulating a gray scale value of the image signal corresponding to a color to be regulated and/or a color not to be regulated by using a preset compensation gray scale value in a region to be regulated of a display region so as to compensate the colors of the backlight, wherein the compensation gray scale value is set according to the inhomogeneity degree of the measured brightness of the colors of the backlight in the region to be regulated. The device comprises a receiving module and a compensation module. By the embodiment, the color homogeneity of a liquid crystal display is improved, so the display effect and the picture quality of the liquid crystal display screen are improved greatly.
Description
Technical field
The embodiment of the invention relates to technical field of liquid crystal display, relates in particular to a kind of color compensating method and apparatus of backlight.
Background technology
LCD is based on advantages such as its volume are little, frivolous, and having substituted traditional display gradually becomes the main product in the field of display.In side-light type display in the market, its backlight that adopts is RGB (Red Green Blue; Hereinafter to be referred as: (the LightingEmitting Diode of light emitting diode RGB); Hereinafter to be referred as: LED) backlight; Receive the restriction of color representation power; Realize surpassing the display effect of 100% colour gamut; The lamp that is applied on the backlight all encapsulates through RGB three color chips, and receives the restriction in its space of arranging, and uses the LED-backlit source for being formed by the three-in-one Chip Packaging of RGB comparatively widely at present in the side-light type display.
Be illustrated in figure 1 as the synoptic diagram of the three-in-one chip of RGB in the prior art; In the prior art; Because the relation with distribution of color of arranging of the three-in-one chip of RGB, about the lamp bar in LED-backlit source, can produce the even hot spot of a slice irregular colour respectively, as in the display of using one-sided three-in-one lamp bar and the three-in-one lamp bar of bilateral;, display can about it, produce the inhomogeneous spot of red indigo plant when showing white picture; And the existence equally in the display of using three-in-one lamp bar of three sides or the three-in-one lamp bar of four sides of this phenomenon, make that the color homogeneity of LCD is relatively poor, make the display effect of LCD and image quality reduce.
Summary of the invention
The embodiment of the invention provides a kind of color compensating method and apparatus of backlight; In order to solve the inhomogenous defective of specific region color of using the LCD of the three-in-one lamp bar of RGB in the prior art; Make the color homogeneity of LCD be improved, thereby improve the display effect and the image quality of LCD.
The embodiment of the invention provides a kind of color compensating method of backlight, comprising:
Receive picture signal;
Wait to transfer in the zone in the viewing area; Treat with preset compensation GTG value and to transfer color and/or non-ly to wait to transfer the GTG value of the pairing said picture signal of color to adjust; Color with compensate for backlight; Wherein, said compensation GTG value is in said heterogeneity degree set of waiting to transfer brightness in the zone according to each color of the said backlight that measures.
The embodiment of the invention provides a kind of color compensating device of backlight, comprising:
Receiver module is used to receive picture signal;
Compensating module; Be used for zone to be transferred in the viewing area; Treat with preset compensation GTG value and to transfer color and/or non-ly to wait to transfer the GTG value of the pairing said picture signal of color to adjust; With the color of compensate for backlight, wherein, said compensation GTG value is in said heterogeneity degree set of waiting to transfer brightness in the zone according to each color of the said backlight that measures.
The color compensating method and apparatus of a kind of backlight of the embodiment of the invention; After receiving picture signal; Through preset compensation GTG value waiting to transfer and wait to transfer color in the zone and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust to the viewing area; To realize compensation to the color of backlight; Present embodiment has solved the inhomogenous defective of specific region color of using the LED-backlit display of the three-in-one lamp bar of RGB in the prior art, makes the color homogeneity of LED-backlit display be improved, thereby has improved the display effect and the image quality of LCD greatly.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the synoptic diagram of the three-in-one chip of RGB in the prior art;
Fig. 2 is the process flow diagram of the color compensating method embodiment one of backlight of the present invention;
Fig. 3 is the process flow diagram of the color compensating method embodiment two of backlight of the present invention;
Fig. 4 is for using the synoptic diagram of the display of one-sided three-in-one lamp bar among the color compensating method embodiment two of backlight of the present invention;
Fig. 5 is the process flow diagram of the color compensating method embodiment three of backlight of the present invention;
Fig. 6 is a synoptic diagram of the display of the three-in-one lamp bar of application of bilateral among the color compensating method embodiment three of backlight of the present invention;
Fig. 7 is another synoptic diagram of the display of the three-in-one lamp bar of application of bilateral among the color compensating method embodiment three of backlight of the present invention;
Fig. 8 is the structural drawing of the color compensating device embodiment of backlight of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 2 is the process flow diagram of the color compensating method embodiment one of backlight of the present invention, and as shown in Figure 2, present embodiment provides a kind of color compensating method of backlight, can comprise the steps:
Because the chip of the backlight distribution relation with color of arranging in the display; The zone that can occur brightness disproportionation one about when display shows white picture, the zone to be transferred in the present embodiment are in the viewing area of display the zone that occurs brightness disproportionation one corresponding to the color of backlight.Because the distribution of color of backlight is different; The color of waiting to transfer the brightness disproportionation one that occurs in the zone in the viewing area is also different; Color to be transferred in the present embodiment is that to wait to transfer the color that occurs brightness disproportionation one in the zone, color non-to be transferred be except that other colors of waiting to transfer the color.Particularly; The color of backlight can comprise redness, green and blue; The color to be transferred here can be in three kinds of colors of backlight a kind of, also can be the color mixture of certain two kinds of color in three kinds of colors, as by the blue and red pink colour that mixes; Red and the green color that mixes is yellow, the blue and green cyan that mixes.If color to be transferred is red, color then non-to be transferred is blue and green.
Owing to exist back light source brightness in the inhomogeneity of waiting to transfer the zone,, need compensate so when carrying out the image demonstration, wait to transfer the GTG value of regional pixel to cooperate the gray scale that appears afterwards will depart from expection with back light source brightness.After display receives picture signal, utilize preset compensation GTG value to treat to transfer color and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust, with the color of compensate for backlight.Wherein, compensation GTG value is in the heterogeneity degree set of waiting to transfer brightness in the zone, through measuring to know waiting to transfer which kind of irregular colour one in the zone, and through measuring the heterogeneity degree that can know the heterogeneity color according to the backlight that measures.
Present embodiment provides a kind of color compensating method of backlight; After receiving picture signal; Through preset compensation GTG value waiting to transfer and wait to transfer color in the zone and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust to the viewing area; To realize compensation to the color of backlight; Present embodiment has solved the inhomogenous defective of specific region color of using the display of the three-in-one lamp bar of RGB in the prior art, makes the color homogeneity of display be improved, thereby has improved the display effect and the image quality of LCD greatly.
Fig. 3 is the process flow diagram of the color compensating method embodiment two of backlight of the present invention; As shown in Figure 3; Present embodiment provides a kind of color compensating method of backlight; Present embodiment is that example is at length explained technical scheme of the present invention with the compensation method of each color in the display of one-sided three-in-one lamp bar, can comprise the steps:
Wherein, through measuring the GTG figure can obtain the whole viewing area of display, what brightness disproportionation one appearred in each color that from this figure, can know backlight in display waits to transfer the zone, and can know the heterogeneity degree of brightness through measurement.After the design of accomplishing the display of using three-in-one LED lamp bar, through testing tool this display to be tested, each color that gets access to backlight in the display is in the heterogeneity degree and the distribution situation of waiting to transfer regional brightness.Because the ordering of present three-in-one chip is bluish-green red; Promptly green in the centre of blue and red chip, therefore, present embodiment describes with this example that is combined as of chip; It will be appreciated by those skilled in the art that; When the combination of chip changes, be equally applicable to the technical scheme of the embodiment of the invention, still can solve the problem of the backlight irregular colour one of its existence through this technical scheme.
Be illustrated in figure 4 as the synoptic diagram of using the display of one-sided three-in-one lamp bar among the color compensating method embodiment two of backlight of the present invention; Through testing tool display is tested just and can be obtained above-mentioned figure; From this figure, can find out; The phenomenon of irregular colour one appears in which zone of display, and which color shows as heterogeneity in this zone.With above-mentioned Fig. 4 is that example describes; Can obtain through measuring; The phenomenon of the irregular colour one of backlight all appears in 1,2,3,4,5,6 in the zone in display, not only occurs the inhomogeneity of color in each zone, and each regional inhomogeneity degree is also different.Usually; The color that occurs inhomogeneity in the zone 1,2,3 is blue or red a kind of color; And zone 4,5,6 be red or blue a kind of color, be blue heterogeneity with zone 1,2,3 in the present embodiment, and regional 4,5,6 is that red heterogeneity is that example describes.Wherein, The value of the required compensation of color GTG value in any one scope in each zone is identical; And be under the situation of conventional symmetric design at backlight; It also is corresponding approximate that the value that needs compensation is waited to transfer in the zone in the display screen left and right sides, and promptly zone 1 and zone 6 value that needs compensate can be identical.Present embodiment is only with one of them zone, and for the color compensating method of example describes, the color compensating method in other zones 2,3,4,5,6 can be similar with zone 1, therefore gives unnecessary details no longer one by one like zone 1.After the heterogeneity degree of the brightness of this step in get access to zone 1 through measurement; Wherein be presented as blue heterogeneity; Color then to be transferred is blue, and color then non-to be transferred is red and green, waits to transfer color and non-compensation GTG value of waiting to transfer color according to measurement result setting.Suppose to wait that transferring the compensation GTG value of color is P
B1, red compensation GTG value is P
R1, green compensation GTG value is P
G1, wait to transfer color in the present embodiment and non-ly wait to transfer the compensation GTG value of color to equate.Because the grey-scale range of all colours is 0～255, promptly red grey-scale range is 0～255, and green grey-scale range is 0～255, and blue grey-scale range is 0～255, then compensates GTG value P
B1, P
G1And P
R1It also is the value between 0～255.
Step 303; Whether the difference of judging the initial GTG value wait to transfer the pairing picture signal of color and compensation GTG value less than the minimum gray value, and whether the non-initial GTG value of waiting to transfer the pairing picture signal of color and compensation GTG value sum be greater than the maximum gray value.
Display obtains waiting to transfer and waiting to transfer color and non-initial GTG value of waiting to transfer the pairing picture signal of color, i.e. P in the zone of viewing area earlier after receiving picture signal
B0, P
G0And P
R0Waiting to transfer the heterogeneity degree of brightness in the zone that compensation GTG value is provided with according to the color of backlight, and be compensated GTG value P
B1, P
G1And P
R1Afterwards, need judgement to wait to transfer the initial GTG value P of color
B0With compensation GTG value P
B1Difference P
B0-P
B1Whether less than the minimum gray value, and judge the non-initial GTG value P that waits to transfer color
G0, P
R0With corresponding compensation GTG value P
G1, P
R1Sum P
G0+ P
G1, P
R0+ P
R1Whether greater than the maximum gray value.Minimum gray value in the present embodiment can be 0, and the maximum gray value can be 255, and this step is promptly judged P
B0-P
B1Whether less than 0, P
G0+ P
G1Whether greater than 255, P
R0+ P
R1Whether greater than 255.
According to the judged result of above-mentioned steps 303, utilize compensation GTG value that the GTG value of each color is adjusted, compensate with the color of realization backlight.Particularly; Be the initial GTG value of waiting to transfer color when the judged result of above-mentioned steps 303 with the difference of compensation GTG value greater than the minimum gray value; And the non-initial GTG value of waiting to transfer color is with compensation GTG value sum during less than the maximum gray value; Then select to reduce to wait to transfer the GTG value of color, perhaps select to increase non-GTG value of waiting to transfer color according to regulating degree.Promptly work as P
B0-P
B1Less than 0, and P
G0+ P
G1Greater than 255, P
R0+ P
R1Greater than 255 o'clock, then select to reduce blue GTG value according to regulating degree, perhaps select to increase red with green GTG value.Further; Judge that whether compensation GTG value is less than preset GTG value; If; Then will wait to transfer the GTG value of color to be adjusted into to wait the poor of the initial GTG value of transferring color and compensation GTG value, otherwise will non-ly wait to transfer the GTG value of color to be adjusted into the non-initial GTG value of waiting to transfer color and compensate GTG value sum.Preset GTG value in the present embodiment can be assumed to be 100 for certain value between 0～255, through judging P
B1During less than preset GTG value, then select to reduce blue GTG value, and red with green GTG value remains unchanged and realizes the compensation to the color of backlight in the display, is about to blue GTG value and is adjusted into P
B0-P
B1, and green with red GTG value still is initial GTG value P
G0And P
R0Otherwise select to increase red with green GTG value, and blue GTG value remains unchanged and realizes the compensation to the color of backlight in the display, is about to green with red GTG value and is adjusted into P respectively
G0+ P
G1And P
R0+ P
R1, and blue GTG value still is initial GTG value P
B0And the GTG value that need compensate in color to be transferred hour; Then directly reduce the GTG value that this waits to transfer color; Through transferring the GTG value of regional Smalt to turn down,, reach the purpose of even demonstration to realize compensation to the color of backlight in the display with waiting in the display screen; And the GTG value that need compensate in color to be transferred then increases the GTG value of all the other two colors when big, through with in the display screen non-wait to transfer redly in the zone heighten with green GTG value, to realize compensation, reach the purpose of even demonstration to the backlight color.
Be the initial GTG value of waiting to transfer color when the judged result of above-mentioned steps 303 with the difference of compensation GTG value greater than the minimum gray value; And the non-initial GTG value of waiting to transfer color is with compensation GTG value sum during greater than the maximum gray value; Then will wait to transfer the GTG value of color to be adjusted into to wait the poor of the initial GTG value of transferring color and compensation GTG value, and wait to transfer the GTG value of color to be adjusted into the maximum gray value non-.Promptly work as P
B0-P
B1Greater than 0, and P
G0+ P
G1Greater than 255, P
R0+ P
R1Greater than 255 o'clock, then the GTG value of blueness is adjusted, the GTG value of blueness is adjusted into P
B0-P
B1And green with red GTG value is adjusted into maximum gray value 255, through transferring the GTG value of regional Smalt to turn down, heighten with red GTG value green with waiting in the display screen; To realize compensation, reach the purpose of even demonstration to the color of backlight in the display.
Be the initial GTG value of waiting to transfer color when the judged result of above-mentioned steps 303 with the difference of compensation GTG value less than the minimum gray value; And the non-initial GTG value of waiting to transfer color is with compensation GTG value sum during less than the maximum gray value; Then will wait to transfer the GTG value of color to be adjusted into the minimum gray value, and wait to transfer the GTG value of color to be adjusted into non-initial GTG value and compensation GTG value sum of waiting to transfer color non-.Promptly work as P
B0-P
B1Less than 0, and P
G0+ P
G1Less than 255, P
R0+ P
R1Less than 255 o'clock, then adjust with green GTG value red, be about to P
G0+ P
G1As the adjusted GTG value of green, the GTG value of redness is adjusted into P
R0+ P
R1, and the GTG value of blueness is adjusted into minimum gray value 0, and through with waiting to transfer GTG value red and green in the zone to heighten in the display screen, the GTG value of blueness is turned down, to realize compensation, reach the purpose of even demonstration to the color of backlight in the display.
Be the initial GTG value of waiting to transfer color when the judged result of above-mentioned steps 303 with the difference of compensation GTG value less than the minimum gray value; And the non-initial GTG value of waiting to transfer color is with compensation GTG value sum during greater than the maximum gray value; Then will wait to transfer the GTG value of color to be adjusted into the minimum gray value, and wait to transfer the GTG value of color to be adjusted into the maximum gray value non-.Promptly work as P
B0-P
B1Less than 0, and P
G0+ P
G1Greater than 255, P
R0+ P
R1Greater than 255 o'clock; Then the GTG value with blueness is adjusted into 0, and the GTG value of redness is adjusted into 255, and the GTG value of green is adjusted into 255; Through redly heightening with green GTG value with waiting in the display screen to transfer in the zone; The GTG value of blueness is turned down,, reached the purpose of even demonstration to realize compensation to the color of backlight in the display.
Further; Can also adopt following method to come the GTG value of each color is adjusted; After the above-mentioned judgement of process; When the difference of the initial GTG value of waiting to transfer color and compensation GTG value during less than said minimum gray value; Then in the viewing area in the every other zone of waiting to transfer the zone GTG value of each color adjust, transfer the GTG value of color to be adjusted into the initial GTG value and the first difference GTG value sum of waiting to transfer color with in the every other zone of waiting to transfer the zone, waiting in the viewing area, this first difference GTG value is the absolute value of the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value.Promptly work as P
B0-P
B1Less than 0 o'clock; GTG value in blueness is set in 0; Can also specifically the adjusted GTG value of each color in the every other zone be adjusted into the initial GTG value and the first difference GTG value sum of each color in the every other zone, wherein to transferring the GTG value of each color in the every other zone the zone 1 to adjust except that waiting in the viewing area; The first difference GTG value is the absolute value of waiting to transfer the initial GTG value of color and compensating the difference of GTG value, promptly | and P
B0-P
B1|, in other zones, all increase on the initial GTG value of each color and should be worth | P
B0-P
B1|.Through the GTG value of each color in the every other zone in the viewing area is heightened, the GTG value of blueness is turned down, to realize compensation, reach the purpose of even demonstration to the color of backlight in the display.
Further; Can also adopt following method to come the GTG value of each color is adjusted; After the above-mentioned judgement of process; When the non-initial GTG value of waiting to transfer color with compensation GTG value sum during greater than the maximum gray value; To in the viewing area in the every other zone of waiting to transfer the zone GTG value of each color adjust, wait to transfer the GTG value of color to be adjusted into the non-initial GTG value and the second difference GTG value sum of waiting to transfer color with non-in the every other zone of waiting to transfer the zone in the viewing area, this second difference GTG value is to wait to transfer the initial GTG value of color and the difference of compensation GTG value sum and maximum gray value.Promptly work as P
G0+ P
G1Greater than 255, perhaps P
R0+ P
R1Greater than 255 o'clock, the GTG value of redness be set to 255 or the adjusted GTG value of green be set in 255, can also wait to transfer the GTG value of each color in the every other zone regional 1 to adjust to removing in the viewing area.Specifically the GTG value of each color in the every other zone is adjusted into the initial GTG value and the second difference GTG value sum of each color in the every other zone; Wherein, The second difference GTG value is to wait to transfer the initial GTG value of color and the difference of compensation GTG value sum and maximum gray value, i.e. P
R0+ P
R1-255, in other zones, all increasing on the initial GTG value of each color should value P
R0+ P
R1-255.Through the GTG value of each color in the every other zone in the viewing area is heightened, the GTG value of blueness is turned down, to realize compensation, reach the purpose of even demonstration to the color of backlight in the display.
Further; After the GTG value adjustment through above-mentioned each color; Whether the GTG value that can also comprise the steps: to judge adjusted each color in the every other zone is greater than the maximum gray value; If; Then the non-GTG value of waiting to transfer color in the said every other zone is adjusted into and saidly adjustedly non-ly waits to transfer the GTG value of color and the 3rd difference GTG value long-pending, the 3rd difference GTG value quotient that to be the maximum gray value obtain divided by the initial GTG value of waiting to transfer color and compensation GTG value sum; Otherwise, finish.Promptly judge in the viewing area except that the adjusted GTG value of waiting to transfer each color in the every other zone the zone 1 whether greater than 255; If; Then in every other zone, multiply by the 3rd difference GTG value on the adjusted GTG value of each color, the 3rd difference GTG value is 255/ (P
R0+ P
R1).Because overflowing appears in the result after the adjustment of GTG value, then all multiply by this value 255/ (P through the GTG value with each color in the every other zone in the viewing area
R0+ P
R1), further to turn down in the viewing area GTG value of each color in the every other zone,, reach the purpose of even demonstration to realize compensation to the color of backlight in the display.
Present embodiment provides a kind of color compensating method of backlight; After receiving picture signal; Through preset compensation GTG value waiting to transfer and wait to transfer color in the zone and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust to the viewing area; To realize compensation to the color of backlight; Present embodiment has solved the inhomogenous defective of specific region color of using the LED-backlit display of the three-in-one lamp bar of RGB in the prior art, makes the color homogeneity of LED-backlit display be improved, thereby has improved the display effect and the image quality of LCD greatly.
Fig. 5 is the process flow diagram of the color compensating method embodiment three of backlight of the present invention; As shown in Figure 5; Present embodiment provides a kind of color compensating method of backlight; Present embodiment is that example is at length explained technical scheme of the present invention with the compensation method of each color in the backlit display of the three-in-one lamp bar of bilateral, can comprise the steps:
Two synoptic diagram like Fig. 6 and the display for the three-in-one lamp bar of application of bilateral among the color compensating method embodiment three of backlight of the present invention shown in Figure 7; In Fig. 6, the arrangements of chips of supposing first LEDs is bluish-green red, and then 1 end at the lamp bar is a blue chip; The N end is red chip; Therefore lamp bar 1 end in entire backlight source begins from blueness, and the N end finishes with redness, and then it also is the zone that a slice irregular colour one is each side arranged; Its heterogeneity situation and above-mentioned Fig. 4 are similar, occur blue and red inhomogenous situation symmetrically about the display center horizontal line.For the display of the three-in-one lamp bar of application of bilateral shown in Figure 7, because the LED of side lamp bar arranges on the contrary up and down, then 1 end of lamp bar all begins from blueness; The N end finishes with redness; In zone 1, have the blue and red pink colour hot spot that mixes this moment, but the adjustment of this pink colour hot spot is also similar with the adjustment of above-mentioned monochromatic hot spot, color just to be transferred becomes red and blue two colors; Color non-to be transferred becomes green, and this sentences Fig. 7 and describes for example.In this step, can obtain through measuring, the phenomenon of irregular colour one all appears in the zone 1,2,3,4,5,6 in the viewing area of display, and the color that occurs inhomogeneity in the present embodiment is blue with red color mixture, i.e. pink colour.Because the value of the required compensation of color GTG value in any one scope in each zone is identical, then present embodiment is also only with one of them zone, and for the color compensating method of example describes, similarly repeat no more in other zones like zone 1.Color to be transferred is blue and red in the present embodiment; Color then non-to be transferred is green; After the heterogeneity degree of this step brightness in get access to zone 1 through measurement; Wait to transfer color and non-compensation GTG value of waiting to transfer color according to measurement result setting, wait to transfer color in the present embodiment and non-ly wait to transfer the compensation GTG value of color to equate, promptly blue compensation GTG value P
B1, red compensation GTG value P
R1Compensation GTG value P with green
G1Equate.
Step 503; Judge that whether the difference of waiting to transfer the initial GTG value of the pairing picture signal of color and compensate the GTG value is less than the minimum gray value; And whether the non-initial GTG value of waiting to transfer the pairing picture signal of color and compensation GTG value sum promptly judge P greater than the maximum gray value
B0-P
B1Whether less than 0, P
R0-P
R1Whether less than 0, P
G0+ P
G1Greater than 255, this step can be similar with above-mentioned steps 303, repeats no more here.
Step 504 according to judged result, utilizes compensation GTG value that the GTG value of each color is adjusted.
When above-mentioned judged result is P
B0-P
B1Less than 0, P
R0-P
R1Less than 0, and P
G0+ P
G1Greater than 255 o'clock, then select to reduce blue with red GTG value according to regulating degree, perhaps select to increase green GTG value and come the GTG value of each color is adjusted.Further, judge compensation GTG value P
B1And P
R1Less than preset GTG value, the preset GTG value in the present embodiment can be assumed to be 100 for certain value between 0～255, through judging P
B1Less than preset GTG value, P
R1During less than preset GTG value, then the GTG value with blueness is adjusted into P
B0-P
B1, the GTG value of redness is adjusted into P
R0-P
R1, and green GTG value still is initial GTG value P
G0Otherwise the GTG value of green is adjusted into P
G0+ P
G1, and blue with red GTG value still is initial GTG value P
B0And P
R0When above-mentioned judged result is P
B0-P
B1Greater than 0, P
R0-P
R1Greater than 0, and P
G0+ P
G1Greater than 255 o'clock, then the GTG value with blueness was adjusted into P
B0-P
B1, the GTG value of redness is adjusted into P
R0-P
R1, and the GTG value of green is adjusted into maximum gray value 255.When above-mentioned judged result is P
B0-P
B1Less than 0, P
R0-P
R1Less than 0, and P
G0+ P
G1Less than 255 o'clock, then the GTG value with green was adjusted into P
G0+ P
G1, blue with red GTG value is adjusted into minimum gray value 0.When above-mentioned judged result is P
B0-P
B1Less than 0, P
R0-P
R1Less than 0, and P
G0+ P
G1Greater than 255 o'clock, then blue with red GTG value is adjusted into 0, the GTG value of green is adjusted into 255.
Further, through after the above-mentioned judgement, work as P
B0-P
B1Less than 0 or P
R0-P
R1Less than 0 o'clock, be set in 0 in blue or red GTG value, can also be in other zones all increasing on the initial GTG value of each color should value | P
B0-P
B1| or | P
R0-P
R1|.Perhaps, work as P
G0+ P
G1Greater than 255, be set in 255 in the GTG value of green, can also should value P with all increasing on the initial GTG value of each color in other zones
G0+ P
G1-255.
Further; After the GTG value adjustment through above-mentioned each color; Can also comprise: judge in the display screen except that the GTG value of waiting to transfer adjusted each color in the every other zone the zone 1 whether greater than 255; If then in every other zone, multiply by 255/ (P on the GTG value of adjusted each color
R0+ P
R1).
Present embodiment provides a kind of color compensating method of backlight; After receiving picture signal; Through preset compensation GTG value waiting to transfer and wait to transfer color in the zone and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust to the viewing area; To realize compensation to the color of backlight; Present embodiment has solved the inhomogenous defective of specific region color of using the LED-backlit display of the three-in-one lamp bar of RGB in the prior art, makes the color homogeneity of LED-backlit display be improved, thereby has improved the display effect and the image quality of LCD greatly.
It is to be noted; The foregoing description is for being that example describes with the backlit display of using one-sided three-in-one lamp bar and the three-in-one lamp bar of application of bilateral; It will be appreciated by those skilled in the art that; The technical scheme that present embodiment provides can solve irregular colour one problem in the backlit display of using three-in-one lamp bar of three sides and the three-in-one lamp bar of application four sides equally, and the heterogeneity color is compensated.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of programmed instruction; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD also can be the functional circuitry (like FPGA or CPLD Circuits System) by the independent realization above-mentioned functions of hardware programming system design.
Fig. 8 is the structural drawing of the color compensating device embodiment of backlight of the present invention; As shown in Figure 8, present embodiment provides a kind of color compensating device of backlight, can specifically carry out each step of said method; Repeat no more here, specifically can comprise receiver module 1 and compensating module 2.Wherein, receiver module 1 is used to receive picture signal.Compensating module 2 is used for the zone to be transferred in the viewing area; Treat with preset compensation GTG value and to transfer color and/or non-ly to wait to transfer the GTG value of the pairing said picture signal of color to adjust; Color with compensate for backlight; Wherein, said compensation GTG value is in said heterogeneity degree set of waiting to transfer brightness in the zone according to each color of the said backlight that measures.
Particularly, compensating module 2 can comprise specifically that first judges the submodule 21 and the first adjustment submodule 22.Wherein, Whether first judge difference that submodule 21 is used to judge the said initial GTG value of waiting to transfer color and preset compensation GTG value less than the minimum gray value, and whether the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum be greater than the maximum gray value.The first adjustment submodule 22 is used for the judged result of judging submodule 21 according to first, utilizes said compensation GTG value waiting to transfer and wait to transfer color described in the zone and/or saidly non-ly wait to transfer the GTG value of color to adjust the viewing area.
More specifically, the first adjustment submodule 22 can specifically comprise first adjustment unit 221, second adjustment unit 222, the 3rd adjustment unit 223 and the 4th adjustment unit 224.Wherein, First adjustment unit 221 be used for when first judge submodule 21 judged result be that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is greater than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then wait to transfer the GTG value of waiting to transfer color described in the zone according to what regulating degree selected to reduce the viewing area, that perhaps selects to increase the viewing area waits to transfer non-GTG value of waiting to transfer color described in the zone.Second adjustment unit 222 be used for when first judge submodule 21 judged result be the initial GTG value of waiting to transfer color with the difference of compensation GTG value greater than the minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; Then the GTG value of waiting to transfer color described in the zone of waiting to transfer with the viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area.The 3rd adjustment unit 223 be used for when first judge submodule 21 judged result be to wait to transfer the difference of initial GTG value and said compensation GTG value of color less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then with the waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color the viewing area.The 4th adjustment unit 224 be used for when first judge submodule 21 judged result be the initial GTG value of waiting to transfer color with the difference of compensation GTG value less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; The waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area then, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area.
Further, first adjustment unit 221 can specifically comprise judgment sub-unit 2211 and adjustment subelement 2212.Wherein, judgment sub-unit 2211 is used to judge that whether said compensation GTG value is less than preset GTG value.Adjustment subelement 2212 is used for judged result according to judgment sub-unit 2211 when being said compensation GTG value less than preset GTG value, and the GTG value of waiting to transfer color described in the zone of waiting to transfer of viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value; When being said compensation GTG value greater than preset GTG value according to the judged result of judgment sub-unit 2211, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color then with the viewing area.
Further, the first adjustment submodule 22 can also comprise the 5th adjustment unit 225 and the 6th adjustment unit 226.Wherein, The 5th adjustment unit 225 is used for the difference of the initial GTG value of waiting to transfer color and compensation GTG value during less than said minimum gray value of judging submodule 21 when first; With transferring the GTG value of color to be adjusted into the said initial GTG value and the first difference GTG value sum of waiting to transfer color except that waiting described in the said every other zone of waiting to transfer the zone in the viewing area, the first difference GTG value is the absolute value of the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value.The 6th adjustment unit 226 is used for the non-initial GTG value of waiting to transfer color and the compensation GTG value sum during greater than said maximum gray value of judging submodule 21 when first; With waiting to transfer the GTG value of color to be adjusted into the said non-initial GTG value and the second difference GTG value sum of waiting to transfer color except that non-described in the said every other zone of waiting to transfer the zone in the viewing area, the said second difference GTG value is said wait the to transfer initial GTG value of color and the difference of compensation GTG value sum and said maximum gray value.
Further, compensating module 2 comprises that also second judges the submodule 23 and the second adjustment submodule 24.Wherein, second judges that submodule 23 is used for judging that whether the adjusted non-GTG value of waiting to transfer color in said every other zone is greater than said maximum gray value.The second adjustment submodule 24 is used for the judged result when being the adjusted non-GTG value of waiting to transfer color in every other zone greater than said maximum gray value of judging submodule 23 according to second; Then the non-GTG value of waiting to transfer color in the said every other zone is adjusted into and saidly adjustedly non-ly waits to transfer the GTG value of color and the 3rd difference GTG value long-pending, said the 3rd difference GTG value quotient that to be said maximum gray value obtain divided by the said initial GTG value of waiting to transfer color and compensation GTG value sum; According to second judge submodule 23 judged result be the adjusted GTG value of each color in the said every other zone during less than said maximum gray value, then finish.
Present embodiment provides a kind of color compensating device of backlight; Through receiver module and compensating module are set; After receiving picture signal; To the waiting to transfer and wait to transfer color in the zone and/or non-ly wait to transfer the GTG value of the pairing picture signal of color to adjust of viewing area, to realize the compensation to the backlight color of display, present embodiment has solved the inhomogenous defective of specific region color of using the LCDs of the three-in-one lamp bar of RGB in the prior art through preset compensation GTG value; Make the color homogeneity of LCDs be improved, thereby improved the display effect and the image quality of LCDs greatly.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (12)
1. the color compensating method of a backlight is characterized in that, comprising:
Receive picture signal;
Wait to transfer in the zone in the viewing area; Treat with preset compensation GTG value and to transfer color and/or non-ly to wait to transfer the GTG value of the pairing said picture signal of color to adjust; Color with compensate for backlight; Wherein, said compensation GTG value is in said heterogeneity degree set of waiting to transfer brightness in the zone according to each color of the said backlight that measures;
Said the viewing area wait to transfer in the zone, treat the GTG value of transferring color and/or non-to wait to transfer the pairing said picture signal of color with preset compensation GTG value and adjust and comprise:
Whether the difference of judging the said initial GTG value of waiting to transfer color and preset compensation GTG value less than the minimum gray value, and whether the said non-initial GTG value of waiting to transfer color and said preset compensation GTG value sum be greater than the maximum gray value;
According to judged result, utilize said compensation GTG value waiting to transfer and wait to transfer color described in the zone and/or saidly non-ly wait to transfer the GTG value of color to adjust to the viewing area.
2. method according to claim 1 is characterized in that, and is said according to judged result, utilizes said compensation GTG value waiting to transfer and wait to transfer color and/or the said non-GTG value of waiting to transfer color to adjust described in the zone to comprise the viewing area:
When said judged result be the said initial GTG value of waiting to transfer color with the difference of preset compensation GTG value greater than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then wait to transfer the GTG value of waiting to transfer color described in the zone according to what regulating degree selected to reduce the viewing area, that perhaps selects to increase the viewing area waits to transfer non-GTG value of waiting to transfer color described in the zone;
When said judged result is that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is greater than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; Then the GTG value of waiting to transfer color described in the zone of waiting to transfer with the viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area;
When said judged result is that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then with the waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color the viewing area;
When said judged result is that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; Then with the waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area.
3. method according to claim 2; It is characterized in that; Saidly wait to transfer the GTG value of waiting to transfer color described in the zone, perhaps select to increase waiting to transfer and non-ly described in the zone waiting to transfer the GTG value of color to comprise of viewing area according to what regulating degree selected to reduce the viewing area:
Judge that whether said compensation GTG value is less than preset GTG value; If; Then the GTG value of waiting to transfer color described in the zone of waiting to transfer with the viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value, otherwise waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color the viewing area.
4. method according to claim 2 is characterized in that, also comprises:
When the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value during less than said minimum gray value; With transferring the GTG value of color to be adjusted into the said initial GTG value and the first difference GTG value sum of waiting to transfer color except that waiting described in the said every other zone of waiting to transfer the zone in the viewing area, the said first difference GTG value is the absolute value of the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value;
When the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum during greater than said maximum gray value; With waiting to transfer the GTG value of color to be adjusted into the said non-initial GTG value and the second difference GTG value sum of waiting to transfer color except that non-described in the said every other zone of waiting to transfer the zone in the viewing area, the said second difference GTG value is said wait the to transfer initial GTG value of color and the difference of compensation GTG value sum and said maximum gray value.
5. method according to claim 4 is characterized in that, also comprises:
Judge that whether the adjusted non-GTG value of waiting to transfer color is greater than said maximum gray value in the said every other zone; If; Then the non-GTG value of waiting to transfer color in the said every other zone is adjusted into and saidly adjustedly non-ly waits to transfer the GTG value of color and the 3rd difference GTG value long-pending, said the 3rd difference GTG value quotient that to be said maximum gray value obtain divided by the said initial GTG value of waiting to transfer color and compensation GTG value sum; Otherwise, finish.
6. according to each described method among the claim 1-5, it is characterized in that said minimum gray value is 1, said maximum gray value is 255.
7. according to each described method among the claim 1-5, it is characterized in that color said to be transferred is monochromatic color, perhaps is the polychrome blend color.
8. the color compensating device of a backlight is characterized in that, comprising:
Receiver module is used to receive picture signal;
Compensating module; Be used for zone to be transferred in the viewing area; Treat with preset compensation GTG value and to transfer color and/or non-ly to wait to transfer the GTG value of the pairing said picture signal of color to adjust; With the color of compensate for backlight, wherein, said compensation GTG value is in said heterogeneity degree set of waiting to transfer brightness in the zone according to each color of the said backlight that measures;
Said compensating module comprises:
First judges submodule, and whether the difference that is used to judge the said initial GTG value of waiting to transfer color and preset compensation GTG value less than the minimum gray value, and whether the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum be greater than the maximum gray value;
The first adjustment submodule is used for the judged result of judging submodule according to said first, utilizes said compensation GTG value waiting to transfer and wait to transfer color described in the zone and/or saidly non-ly wait to transfer the GTG value of color to adjust the viewing area.
9. device according to claim 8 is characterized in that, the said first adjustment submodule comprises:
First adjustment unit; Be used for when said first judge submodule said judged result be the said initial GTG value of waiting to transfer color with the difference of preset compensation GTG value greater than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then wait to transfer the GTG value of waiting to transfer color described in the zone according to what regulating degree selected to reduce the viewing area, that perhaps selects to increase the viewing area waits to transfer non-GTG value of waiting to transfer color described in the zone;
Second adjustment unit; Be used for when said first judge submodule said judged result be that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is greater than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; Then the GTG value of waiting to transfer color described in the zone of waiting to transfer with the viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area;
The 3rd adjustment unit; Be used for when said first judge submodule said judged result be that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during less than said maximum gray value; Then with the waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color the viewing area;
The 4th adjustment unit; Be used for when said first judge submodule said judged result be that the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value is less than said minimum gray value; And the said non-initial GTG value of waiting to transfer color and said compensation GTG value sum are during greater than said maximum gray value; Then with the waiting to transfer and wait to transfer the GTG value of color to be adjusted into said minimum gray value described in the zone of viewing area, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said maximum gray value the viewing area.
10. device according to claim 9 is characterized in that, said first adjustment unit comprises:
Judgment sub-unit is used to judge that whether said compensation GTG value is less than preset GTG value;
The adjustment subelement; When being used for judged result according to said judgment sub-unit and being said compensation GTG value, the GTG value of waiting to transfer color described in the zone of waiting to transfer of viewing area is adjusted into the poor of the said initial GTG value of waiting to transfer color and said compensation GTG value less than preset GTG value; When being said compensation GTG value greater than preset GTG value according to the judged result of said judgment sub-unit, waiting to transfer and non-ly described in the zone wait to transfer the GTG value of color to be adjusted into said non-initial GTG value and said compensation GTG value sum of waiting to transfer color then with the viewing area.
11. device according to claim 9 is characterized in that, the said first adjustment submodule also comprises:
The 5th adjustment unit; Be used for the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value during of judging submodule when said first less than said minimum gray value; With transferring the GTG value of color to be adjusted into the said initial GTG value and the first difference GTG value sum of waiting to transfer color except that waiting described in the said every other zone of waiting to transfer the zone in the viewing area, the said first difference GTG value is the absolute value of the difference of the said initial GTG value of waiting to transfer color and said compensation GTG value;
The 6th adjustment unit; Be used for the said non-initial GTG value of waiting to transfer color and the said compensation GTG value sum during of judging submodule when said first greater than said maximum gray value; With waiting to transfer the GTG value of color to be adjusted into the said non-initial GTG value and the second difference GTG value sum of waiting to transfer color except that non-described in the said every other zone of waiting to transfer the zone in the viewing area, the said second difference GTG value is said wait the to transfer initial GTG value of color and the difference of compensation GTG value sum and said maximum gray value.
12. device according to claim 11 is characterized in that, said compensating module also comprises:
Second judges submodule, is used for judging that whether the adjusted non-GTG value of waiting to transfer color in said every other zone is greater than said maximum gray value;
The second adjustment submodule; Be used for the judged result when being the adjusted non-GTG value of waiting to transfer color in said every other zone of judging submodule according to said second greater than said maximum gray value; Then the non-GTG value of waiting to transfer color in the said every other zone is adjusted into and saidly adjustedly non-ly waits to transfer the GTG value of color and the 3rd difference GTG value long-pending, said the 3rd difference GTG value quotient that to be said maximum gray value obtain divided by the said initial GTG value of waiting to transfer color and compensation GTG value sum; According to said second judge submodule judged result be the adjusted GTG value of each color in the said every other zone during less than said maximum gray value, then finish.
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| CN102262868B (en) * | 2011-08-05 | 2013-04-03 | 福建华映显示科技有限公司 | Circuit and method for compensating color deviation of color sequential method |
| CN103295557B (en) * | 2012-02-24 | 2016-03-30 | 联想(北京)有限公司 | A kind of display adjusting method and device |
| CN103327275B (en) | 2013-05-08 | 2016-06-29 | 深圳市绎立锐光科技开发有限公司 | Display uniformity compensation method, optic modulating device, signal processor and optical projection system |
| CN103792704A (en) * | 2014-01-27 | 2014-05-14 | 北京京东方视讯科技有限公司 | Testing device, method of testing device, display device and display method of display device |
| CN104299585B (en) * | 2014-10-14 | 2017-01-25 | 京东方科技集团股份有限公司 | Method for improving color errors, color error adjustment structure and display device |
| CN104882098B (en) * | 2015-06-08 | 2018-07-10 | 广东威创视讯科技股份有限公司 | Method for correcting image and imaging sensor based on LED mosaic display screens |
| CN106157869B (en) * | 2016-06-30 | 2019-11-05 | 京东方科技集团股份有限公司 | A kind of colour cast modification method, correcting device and display device showing image |
| CN107734314B (en) * | 2016-08-11 | 2019-11-12 | 深圳光峰科技股份有限公司 | Image processing apparatus and optical projection system |
| CN107799079B (en) * | 2017-10-10 | 2019-06-11 | 惠科股份有限公司 | Method for driving liquid crystal display, device and equipment |
| CN107919099B (en) | 2017-10-10 | 2019-09-17 | 惠科股份有限公司 | Method for driving liquid crystal display, device and equipment |
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| CN1971367A (en) * | 2005-11-22 | 2007-05-30 | Nec液晶技术株式会社 | Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display |
| CN101581853A (en) * | 2008-05-13 | 2009-11-18 | 乐金显示有限公司 | Backlight unit containing light emitting diode and liquid crystal display device containing the same |
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| CN1971367A (en) * | 2005-11-22 | 2007-05-30 | Nec液晶技术株式会社 | Flat lighting source, luminance correcting circuit, luminance correcting method and liquid crystal display |
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