CN102243855A - Integrated backlight dimming method and device for enhancing liquid crystal display contrast ratio - Google Patents
Integrated backlight dimming method and device for enhancing liquid crystal display contrast ratio Download PDFInfo
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- CN102243855A CN102243855A CN2011102462637A CN201110246263A CN102243855A CN 102243855 A CN102243855 A CN 102243855A CN 2011102462637 A CN2011102462637 A CN 2011102462637A CN 201110246263 A CN201110246263 A CN 201110246263A CN 102243855 A CN102243855 A CN 102243855A
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Abstract
The invention discloses an integrated dimming method for a liquid crystal display backlight source, and the integrated dimming method comprises the following steps: carrying out the statistics analysis on input images, thus obtaining a backlight dimming factor k (0<=k<=1); integrally changing the backlight brightness according to the k and simultaneously generating an S curve according to the characteristic values of the images; and independently compensating each liquid crystal pixel according to the S curve, wherein the pixel compensation factor with the brightness larger than the inflection point of the S curve is larger than 1 and the pixel compensation factor with the brightness less than the inflection point of the S curve is less than 1, thereby effectively enhancing the display contrast ratio and simultaneously reducing the energy consumption. The invention also discloses a backlight device with a global dimming function, and the backlight device comprises an LED (Light Emitting Diode) light source plate, a video signal interface plate, an LED driving plate, an FPGA (Field Programmable Gate Array) control plate and the like. The dimming algorithm disclosed by the invention can be used for enhancing the dynamic contrast ratio and also effectively enhancing the static contrast ratio and can be used for direct descending type backlight and side emitting type backlight.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly a kind of integrally adjusting light method and apparatus backlight that is used to improve the liquid crystal display contrast.
Background technology
(Liquid Crystal Display LCD) through the development in 30 years, has become the mainstream technology of flat pannel display in liquid crystal display.Liquid crystal molecule itself is not luminous, needs the backlighted viewing area.At present the LCD backlight that uses mainly contain cold-cathode fluorescence lamp (Cold Cathode Fluorescent, CCFL) and light emitting diode (Light Emitting Diode, LED) two kinds.LED has advantages such as life-span length, environmental protection, response time is fast, just progressively enlarges in the application of field of liquid crystal display.
There are two inherent defects in liquid crystal display: (1) contrast is low; (2) power consumption is big.Many researchers adopts dynamic light adjustment technology backlight to improve the liquid crystal display contrast at present, cuts down the consumption of energy simultaneously.The dynamic light adjustment technology can be divided into overall light modulation and local dimming according to backlight brightness regulation method.Overall situation light modulation is the whole backlight illumination that changes, and local dimming then is to be divided into the zone that several can be controlled separately with backlight, determines the backlight illumination that this is regional according to the eigenwert of this zone correspondence image.With respect to local dimming, overall light modulation does not need to carry out zoning design, control to backlight, and required control chip is few, and hardware cost is low.Owing to do not need subregion, do not have the light cross-interference issue that exists in the present local dimming method.The overall situation light modulation also have an outstanding benefit be can either direct-type backlight also can side go out formula backlight in the realization, can satisfy the requirement that volume is frivolous, contrast is high, energy consumption is low simultaneously.
The patent of invention " method and the device thereof of LED-backlit source integrally adjusting light " that University of Fuzhou proposes (application number: 200910309165.6) need default backlight light-adjusting degree of distortion, according to this degree of distortion image is compressed, determine the backlight dimming parameter in conjunction with extraneous brightness simultaneously.This invention is not carried out any adjusting to the liquid crystal pixel gray scale, can suitably improve dynamic contrast, but can't improve static contrast.
Patent of invention " side light type LED back light dynamic partition the control method " (application number: 201010510536.X) proposed a kind of side that can be used in and gone out formula local dimming method backlight that Guangzhou Skyworth Flat Panel display Science and Technology Co., Ltd proposes.LED is arranged on four sides of light guide plate, and the zone that horizontal longitudinal direction LED intersects is the control area of these LED, realizes local dimming with this.This invention goes out formula in side and realized local dimming on backlight, and is different with overall light modulation of the present invention, also is not suitable for direct-light type LED backlight.
The patent of invention that Qingdao Hisense Electric Appliance Co., Ltd obtains the authorization " method of adjustment of liquid crystal display contrast and device " (application number: 200710111510.6) proposed a kind of method that can improve the liquid crystal display dynamic contrast, after the backlight dimming factor is determined, take identical adjustment coefficient to adjust to all liquid crystal pixels, this method can improve the liquid crystal display dynamic contrast, can't improve static contrast.
The LED-backlit overall situation light-dimming method that the present invention proposes promptly can be used for direct-type backlight and can be used for side again to go out formula backlight, applied widely.Can only improve the effect of liquid crystal display dynamic contrast at present most of light modulation algorithms, the present invention both can improve dynamic contrast, also can effectively improve static contrast.
Summary of the invention
The object of the present invention is to provide a kind of overall light-dimming method that is used for the LED-backlit of liquid crystal display, this method had both solved the problem that existing light modulation algorithm can't improve static contrast, have again simultaneously that control channel is few, hardware cost is low, do not have light advantage such as crosstalk, be applicable to that direct-type backlight and side go out the formula LED-backlit.
Another object of the present invention is to provide a kind of back lighting device that helps to improve static contrast of liquid crystal display and dynamic contrast, to solve the problem that the liquid crystal display contrast is not high, energy consumption is big.
For achieving the above object, the present invention adopts following technical scheme:
A kind of LCD backlight source overall situation light-dimming method may further comprise the steps:
A: input picture is carried out statistical study;
B: determine backlight dimming factor k;
C: determine the brightness of S knee point
L g , determine parameter in the S curvilinear equation
AWith
a
D: generate the S curve;
E: generate backlight illumination width modulation (PWM) signal value according to k, the whole backlight illumination of adjusting; Generate LED width modulation backlight (PWM) signal according to dim factor k, send into the LED drive plate;
F: adjust each pixel intensity according to the S curve, adjusted signal is sent into the liquid crystal control panel by the LCD Interface plate.
A kind of back lighting device that helps to improve static contrast of liquid crystal display and dynamic contrast comprises
The A:LED light source board does not need subregion, can be straight-down negative, can be that side goes out formula yet;
The B:LED drive plate receives the signal from the FPGA control panel, produces width modulation (PWM) drive signal that LED needs, and adjusts the luminosity of each LED on the led light source plate in real time;
C: the video signal interface plate is used for receiving video signals;
D: FPGA (Field Programmable Gate Array) (FPGA) control panel, receive signal from the video signal interface plate, produce LED drive signal and liquid crystal pixel brightness adjusting signal according to overall light modulation algorithm;
E: the LCD Interface plate, receive signal from FPGA (Field Programmable Gate Array) (FPGA) control panel, produce the liquid crystal display drive signal;
F: power panel is input as electric main, for each circuit board provides required DC voltage.
Beneficial effect of the present invention is: the LED-backlit source does not need to carry out zoning design and control, and control channel is few, hardware cost is low; There is not the interregional light cross-interference issue that influences display quality.This overall light-dimming method goes out the formula LED-backlit to straight-down negative and side and all is suitable for, and both can improve dynamic contrast, can effectively improve static contrast again.
Description of drawings
Fig. 1 is a device block diagram of the present invention.
Fig. 2 is the present invention's overall situation light-dimming method process flow diagram.
Fig. 3 is an input picture statistical graph of the present invention, and a is a histogram, and b is the accumulative total histogram.
Fig. 4 is the original S curve of the present invention.
Fig. 5 is the S curve that the present invention is used to improve contrast.
Fig. 6 is a back lighting device example 1 of the present invention.
Fig. 7 is a back lighting device example 2 of the present invention.
Embodiment
Core of the present invention is to provide the method for a kind of effective raising liquid crystal display dynamic contrast and static contrast, and this method does not need the subregion that carries out backlight, incoming video signal is carried out statistical study after, generate the backlight brightness values after the light modulation.Simultaneously according to the S curve to liquid crystal each sub-pixel brightness adjust.
See also the device block diagram of Fig. 1.Back lighting device 1 comprises led light source plate 101, LED drive plate 102, video signal interface plate 103, FPGA (Field Programmable Gate Array) (FPGA) control panel 104, LCD Interface plate 105 and power panel 106.Led light source plate 101 can be a straight-down negative, also can be that side goes out formula.Video input signals at first enters video signal interface plate 103 and decodes, and decoded signal enters FPGA (Field Programmable Gate Array) (FPGA) control panel 104.FPGA (Field Programmable Gate Array) (FPGA) control panel 104 comprises chips such as programmable logic controller (PLC) FPGA, storer, FPGA (Field Programmable Gate Array) (FPGA) is analyzed the output signal from video signal interface plate 103, produce LED brightness adjusting signal and each pixel intensity adjustment signal of liquid crystal according to overall light modulation algorithm, import LED drive plate 102 and LCD Interface plate 105 respectively.Power panel 106 receives electric main, and the DC voltage that needs is provided for each circuit board.
See also the overall light-dimming method process flow diagram of realizing in FPGA (Field Programmable Gate Array) (FPGA) control panel 104 of Fig. 2.At first the output signal from video signal interface plate 103 is carried out analyzing and processing, obtain characteristic parameters such as pixel grey scale maximal value, the sub-pixel red (R) of whole two field picture, green (G), blue (B) each color maximum brightness value, average gray, colour brightness mean value, determine the backlight illumination dim factor
k, be shown below:
In the formula,
k 0 Be the dim factor initial value, can select 0.5,0.75 or other values.
bBe the influence coefficient of image to backlight illumination, its value will be considered initial value
k 0 , guarantee
kIn (0,1) scope.For example, when
k 0 Got 0.5 o'clock,
b=510, when
k 0 Got 0.75 o'clock,
b=1020.
Can adopt several different methods to determine
L Blu Equation 2 has provided several definite
L Blu Method.First kind of example is to take each sub-pixel R, G, the peaked method of B brightness.Second example is to take the peaked method of each sub-pixel gray scale.The 3rd example is at first to take out each pixel R, G, B brightness maximal value, then all pixel maximal values is averaged the method for computing.The 4th example is the gray-scale value that at first calculates each sub-pixel, and all grey scale pixel values are averaged computing:
The adjustment factor backlight
kAfter determining, according to
kGenerate the PWM drive signal of LED-backlit.If backlight do not have that the dutycycle of pwm signal is R before the light modulation
1, the pwm signal dutycycle that generates after the light modulation is R
2, R then
2=R
1* k;
Because k always is less than or equal to 1,, reduced energy consumption so backlight illumination also always is less than or equal to the preceding backlight illumination of light modulation after the light modulation.
After backlight illumination is determined,, need adjust liquid crystal pixel brightness for the reduction and the raising contrast of compensate for backlight brightness.Different from the past all pixels are taked the method for identical adjusting range, the present invention adjusts separately each liquid crystal pixel brightness according to the S curve, because each pixel adjusting range difference, has effectively improved and shows static contrast.The S curvilinear equation is as follows:
The S curvilinear equation comprises
AWith
aTwo parameters, wherein
AWith
aRelation be shown below:
In the formula
L g It is S knee point coordinate.The S knee point
L g Determined the setting range of contrast, as shown in Figure 5, brightness greater than
L g Pixel adjust the factor greater than 1, brightness less than
L g Pixel adjust the factor less than 1.For guaranteeing that the light modulation algorithm is applicable to various images, the S knee point
L g By the input picture decision, can be to comprise the brightness value that all pixel certain proportions (as 50%) are corresponding in the accumulative total histogram, also can get all pixel average gray values of image.
See also Fig. 3 curve.Fig. 3 (a) is the statistics histogram of image, and Fig. 3 (b) is the accumulative total histogram of image.N among Fig. 3 (a)
MaxAnd N
MinIt is respectively the brightness value of the maximum and minimum correspondence of quantity in the histogram.H among Fig. 3 (b)
25, H
50, H
75It is respectively the brightness value that comprises the correspondence of all pixels 25%, 50% and 75% in the accumulative total histogram.
L g Can determine by the eigenwert that obtains among Fig. 3.The method of determining has various ways, and following formula has provided 5 kinds of possible obtaining value methods:
L g After determining, get
a=0.22, can obtain according to equation 4
A, obtain the S curve according to equation 3 thus.Fig. 4 is the original S curve that obtains according to equation 3, and its initial point and terminal point by (0,0) and (255,255) 2 points, can't not replenish liquid crystal pixel brightness, so need carry out translation and stretching to curve, obtain the S curve of Fig. 5.Fig. 5 has provided 3 typical S curves.Fig. 5 a is for darker image, and its flex point brightness is lower, thus less to the lower pixel adjustment of gray scale, to avoid image fault than dark-part.Fig. 5 b is for brighter image, and its flex point brightness is higher, thus less to the higher pixel adjustment of gray scale, with the image fault of avoiding dividing than highlights.Fig. 5 c is for the more moderate image of brightness ratio, and its flex point brightness is placed in the middle, for gray scale low and higher pixel all adjust, improve contrast.After obtaining the S curve, the brightness value L original according to liquid crystal pixel
In(horizontal ordinate) searches the ordinate output L of corresponding S curve
Out, with L
OutSend into the LCD Interface plate.
See also embodiment shown in Figure 61.This example 1 is that the side with overall dimming function goes out formula LED-backlit device, comprises that side goes out formula LED lamp 601, light guide plate 602, LED drive plate 603, video signal interface plate 604, FPGA control panel 605, circuit board support 606, power panel 607 and LCD Interface plate 608.Because adopt side to go out mode, the LED quantity that needs is few, all circuit boards can be arranged in the one side of circuit board support 606.
See also embodiment shown in Figure 72.This example 2 is the direct-light type LED backlight devices with overall dimming function, comprises straight-down negative LED lamp 701, FPGA control panel 702, video signal interface plate 703, LED drive plate 704, circuit board support 705, power panel 706 and LCD Interface plate 707.Owing to adopt straight mode down, the LED quantity that needs is more, needs to arrange more chip for driving on the LED drive plate 704, may cause LED drive plate 704 sizes bigger, all circuit boards can't be arranged in the identical faces of circuit board support 705, so circuit board is installed in the two sides of circuit board support 705.Circuit board that dotted line is represented among Fig. 7 and signal lead are in the distance L ED of circuit board support 705 lamp 701 one side far away, and distance L ED lamp 701 nearer one sides are installed LED drive plate 704.
By above embodiment of the present invention as seen, back lighting device of the present invention can be that side goes out formula, also can be straight-down negative.The led light source plate does not need to carry out zoning design, control, has saved hardware cost and development time, has overcome subregion and has controlled unavoidable light cross-interference issue.The FPGA control panel that comprises among the present invention, can adjust backlight illumination in real time according to input picture, according to the S curve each pixel brightness value is adjusted simultaneously, brightness value is adjusted the factor greater than 1 greater than the pixel of flex point, brightness value is adjusted the factor less than 1 less than the pixel of flex point, effectively improve static contrast of liquid crystal display and dynamic contrast thus, cut down the consumption of energy simultaneously.
Though by case description the present invention, those of ordinary skills know, the present invention has many distortion and variation and does not break away from spirit of the present invention, wishes that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (2)
1. integrally adjusting light method and apparatus backlight that is used to improve the liquid crystal display contrast is characterized in that: the described integrally adjusting light method backlight that is used to improve the liquid crystal display contrast may further comprise the steps:
(1) input picture is carried out statistical study;
(2) determine backlight dimming factor k;
(3) determine S knee point brightness Lg, determine parameter A and a in the curvilinear equation;
(4) generate the S curve;
(5) according to dim factor k generation background luminance brightness pwm value, the brightness of integrally adjusting light bias light; Generate LED pulse-width modulation PWM signal backlight according to dim factor k, send into the LED drive plate;
(6) adjust each pixel intensity according to the S curve, adjusted signal is sent into the liquid crystal control panel by the LCD Interface plate.
2. a kind of integrally adjusting light method and apparatus backlight that is used to improve the liquid crystal display contrast according to claim 1, it is characterized in that: the described integrally adjusting light device backlight that is used to improve the liquid crystal display contrast had both helped to improve the liquid crystal display dynamic contrast, also help to improve the static contrast of liquid crystal display, this device comprises:
Led light source plate (101): not needing subregion, can be straight-down negative, also can be that side goes out formula;
LED drive plate (102): receive signal, produce the pulse width modulated drive signal that LED needs, adjust the luminosity that led light source plate (101) is gone up each LED in real time from FPGA (Field Programmable Gate Array) control panel (104);
Video signal interface plate (103): be used for receiving video signals;
FPGA (Field Programmable Gate Array) control panel (104): receive signal, produce LED drive signal and liquid crystal pixel brightness adjusting signal according to overall light modulation algorithm from video signal interface plate (103);
LCD Interface plate (105): receive signal, produce the liquid crystal display drive signal from FPGA (Field Programmable Gate Array) control panel (104);
Power panel (106): be input as electric main, for each circuit board provides required DC voltage.
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