CN101839423A - Method for improving brightness uniformity of LED backlight - Google Patents
Method for improving brightness uniformity of LED backlight Download PDFInfo
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- CN101839423A CN101839423A CN200910218739A CN200910218739A CN101839423A CN 101839423 A CN101839423 A CN 101839423A CN 200910218739 A CN200910218739 A CN 200910218739A CN 200910218739 A CN200910218739 A CN 200910218739A CN 101839423 A CN101839423 A CN 101839423A
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Abstract
The invention discloses a method for improving brightness uniformity of an LED backlight, which comprises the following steps of: measuring and calculating a brightness distribution function of LEDs in a backlight module according to a relationship between characteristic parameters of the used LEDs and an optical system of the backlight, and further calculating an arrangement distance and an arrangement mode of the LEDs in the backlight so as to improve the brightness uniformity of the LED backlight.
Description
Technical field
The present invention relates to the inhomogeneity method of light emitting diode (hereinafter to be referred as LED) back light source brightness of a kind of raising LCD (hereinafter to be referred as LCD), particularly a kind of unequal-interval by LED is arranged, and obtains the uniform LED-backlit of whole-screen brightness source.
Background technology
LCD (LCD) has become the flat-panel display device of main flow at present, yet because liquid crystal itself does not possess emitting characteristics, backlight becomes the indispensable important component part of LCD, the performance of backlight has directly determined brightness, the color of LCD, every indexs such as efficient, power consumption.Most popular in the LCD backlight is cold-cathode fluorescence lamp (CCFL), but comparatively speaking, and it is low, low in energy consumption to use light emitting diode (LED) to have a driving voltage as the backlight of LCD, and color reducibility is good, and environmental suitability is strong, advantages such as no mercury pollution.Under the present case, the LED-backlit source structure that is used for LCD has two kinds of side entering type and straight-down negatives, and side entering type generally is used for the LCD of small-medium size, and the LED-backlit source of large-scale LCD is generally the straight-down negative structure.
In the application in LED-backlit source, no matter be the side entering type or the structure of straight-down negative, the arrangement pitches of LED generally is uniformly, thereby makes the whole-screen brightness uniformity, the particularly brightness of backlight marginal portion in LED-backlit source be starkly lower than other zones.The main purpose of this patent be utilize LED the characteristics of luminescence and and the backlight optical system between relation, the method for a kind of non-homogeneous arrangement LED is proposed, improve the brightness uniformity in LED-backlit source.
Summary of the invention
The objective of the invention is to propose a kind of method that improves LED-backlit source brightness uniformity, reduce cost, improve LED-backlit source brightness.
The LED aligning method that the present invention proposes is achieved in that
According to the characteristic parameter of LED and the optical system characteristics of backlight source module, measure the Luminance Distribution function of LED, calculate the brightness of arbitrfary point in the backlight, under the situation that the brightness uniformity that guarantees the arbitrfary point meets design requirement, obtain the arrangement pitches and the arrangement mode of LED fluorescent tube, concrete steps are:
(1) at first, according to the required LED number n of backlight arrangement and the size in LED-backlit source, calculate LED distance between LED when evenly distributed, in the side entrance back source apparatus, the backlight side length overall of placing LED is d, and the uniform arrangement pitches of LED is a=d/ (n-1); In the direct-type backlight source apparatus, the LED-backlit source is of a size of l (length) * w (wide), the LED quantity nb that arranges on LED quantity na that length direction is arranged and the cross direction satisfies na * nb=n, and then the arrangement pitches of LED is respectively l/ (na-1) and w/ (nb-1) on length and the cross direction;
(2) according to the luminous flux phi i of single LEDs and the LED number n of backlight employing, ask for the total light flux Φ=n Φ i in LED-backlit source, then according to the transmitance parameter of backlight optical system, obtain the mean flow rate L in LED-backlit source, then the full frame brightness excursion everywhere of the brightness uniformity in LED-backlit source requirement is L ± Δ L (Δ L=7.5%L);
(3) measure the Luminance Distribution function of single LEDs after the backlight optical system with color analysis instrument, concrete grammar is: be the center with LED, choose several test points in level respectively with vertical and other directions, measure its brightness value, then by match obtain LED Luminance Distribution function L=f (x, y), it is the center that x and y are respectively with LED, any 1 range coordinate on the plane to LED, L is the brightness of arbitrfary point;
(4) calculating of the non-homogeneous arrangement pitches of LED, known single LEDs is of a size of la (length) * lb (wide), at first place first LEDs at the edge of backlight (is example with the horizontal direction), the spacing at adjacent two LEDs centers may be the arbitrary value between la (lb) and the l/2, based on the actual application requirements, the step-length that the LED arrangement pitches changes is got Δ l, the probable value that is any two LEDs arrangement pitches is la, la+ Δ l, la+2 Δ l, la+3 Δ l... finishes up to l/2, and the arrangement of level and vertical direction is symmetric arrays;
When LED number n a was odd number, then the center was k=(na-1)/2+1.The brightness value computational methods of arbitrfary point are as follows:
for?Di＝la:Δl:l/2；
I gets 1 to k-1, tries to achieve the possible arrangement pitches Di of i and i+1 LEDs;
Dk＝Dk-1，Dk+1＝Dk-2......Dna-1＝D1；
Li＝f(1)+f(2)+f(3)…+f(na)；
I gets 1 to na, and Li represents the brightness value that i is ordered, and f (j) represents j the brightness value that LED is ordered at i;
When LED number n a was even number, then the center was between k=na/2 and k+1.The brightness value computational methods of arbitrfary point are as follows:
for?Di＝la:Δl:l/2；
I gets 1 to k, tries to achieve the possible arrangement pitches Di of i and i+1 LEDs;
Dk+1＝Dk-1，Dk+2＝Dk-2......Dna-1＝D1；
Li＝f(1)+f(2)+f(3)…+f(na)；
I gets 1 to na, and Li represents the brightness value that i is ordered, and f (j) represents j the brightness value that LED is ordered at i;
The distance computation formula and the horizontal direction of vertical direction are similar, and the probable value that is any two LEDs arrangement pitches is lb, lb+ Δ l, and lb+2 Δ l, lb+3 Δ l... finishes up to l/2,
Arrangement pitches according to calculating gained level and vertical direction is adjusted evenly distributed LED, thereby obtains the LED-backlit source of brightness uniformity.
As a kind of simplification of the present invention, the non-homogeneous arrangement of LED can the backlight center be a benchmark all in side entering type and the straight-down negative, along level and the non-homogeneous symmetric arrays of vertical direction difference.In addition,, can arrange LED earlier, and then carry out the zone and divide in order to satisfy the needs of LED-backlit source dynamic light adjustment.
The present invention not changing LED-backlit module optical system, does not increase cost according to the characteristic parameter and the Luminance Distribution function of LED fluorescent tube, only changes under the situation of arrangement mode of LED, has improved the brightness uniformity in LED-backlit source.
Description of drawings
Fig. 1 is the one-sided side entrance back source apparatus structural representation that is used for LCD;
Fig. 2 is the bilateral side entrance back source apparatus structural representation that is used for LCD;
Fig. 3 is a LED arrangement architecture schematic diagram in the side entrance back source apparatus;
Fig. 4 is the direct-light-type backlight apparatus structure schematic diagram that is used for LCD;
Fig. 5 is the example structure schematic diagram of downward back electro-optical device;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
The specific embodiment
See figures.1.and.2, comprise reflecting plate 120, LGP 130, diffuser plate 140 and optical thin film 150 in the side entrance back module, LED fluorescent tube 110 can place LGP one side or both sides, and LED fluorescent tube 110 can be a white light LEDs or multi-colored led.In the side entrance back module, at first need to calculate needed LED fluorescent tube 110 quantity according to the characteristic parameter of LED fluorescent tube 110 and the design objective of LCD.
With reference to Fig. 3, LED fluorescent tube 110 is unequal-interval on circuit board 160 arranges, and all the angle of putting of LED fluorescent tube 110 all is consistent, and this is one of embodiment of this patent.Measurements and calculations go out LED fluorescent tube 110 through the level brightness distribution function L=f (x) after reflecting plate 120, LGP 130, diffuser plate 140 and the optical thin film 150, x is that the distance that LED arranges circuit board 160 centers is arrived in the arbitrfary point on the circuit board 160, and L is a brightness value.Calculate the arrangement pitches x1 of LED fluorescent tube 110 in the horizontal direction according to f (x) then, x2...xn-1 arranges LED fluorescent tube 110 by this spacing, can obtain the higher backlight of brightness uniformity.
With reference to Fig. 4, LED fluorescent tube 110 places under the LGP 130 in the down straight aphototropism mode set, and LED fluorescent tube 110 can be a white light LEDs or multi-colored led, and reflecting plate 120 is positioned on the circuit board 160, and reflecting plate boring can be exposed LED fluorescent tube 110.In down straight aphototropism mode set, at first to go out the quantity of needed LED fluorescent tube 110 according to the calculation of characteristic parameters of the design objective of LCD and LED fluorescent tube 110, calculate the arrangement mode and the arrangement pitches of LED fluorescent tube 110 then.
With reference to Fig. 5, all LED fluorescent tubes 110 of direct-light-type backlight are non-homogeneous arrangement with vertical direction in the horizontal direction, and the put angle of all LED fluorescent tubes 110 on circuit board 160 all be consistent, this be this patent embodiment two.In the present embodiment at first measurements and calculations go out used LED fluorescent tube 110 through the Luminance Distribution function L=f (x after reflecting plates 120, LGP 130, diffuser plate 140 and the optical thin film 150, y), wherein x is the distance that horizontal direction a bit arrives LED-backlit source central vertical vertical line arbitrarily, y is the distance that vertical direction a bit arrives LED-backlit source central horizontal vertical line arbitrarily, and L is a brightness value.Then according to needed LED fluorescent tube 110 sums of backlight, and the Luminance Distribution function f (x of single LEDs fluorescent tube 110, y) in the horizontal direction with the component of vertical direction, calculate the arrangement pitches x1 of horizontal direction LED fluorescent tube 110 respectively, the arrangement pitches y1 of x2...xn-1 and vertical direction LED fluorescent tube 110, y2...ym-1, thus the arrangement mode and the arrangement pitches of all LED fluorescent tubes 110 in the entire backlight source obtained.Arrange LED fluorescent tube 110 by this spacing, can obtain the higher backlight of brightness uniformity.
LED-backlit source aligning method proposed by the invention has following advantage:
Characteristic parameter and Luminance Distribution function according to the LED fluorescent tube do not change LED-backlit module optical system, only change the arrangement mode of LED, improve the performance of backlight, simultaneously, make the back light source brightness uniformity better.
(1) at first, according to the required LED number n of backlight arrangement and the size in LED-backlit source, calculate LED distance between LED when evenly distributed.In the side entrance back source apparatus, the backlight side length overall of placing LED is d, and the uniform arrangement pitches of LED is a=d/ (n-1).In the direct-type backlight source apparatus, the LED-backlit source is of a size of l (length) * w (wide), and the LED quantity of arranging on long and cross direction is respectively na * nb=n, and then the arrangement pitches of LED is respectively l/ (na-1) and w/ (nb-1) on length and the cross direction.
(2) according to the luminous flux phi i of single LEDs and the LED number n of backlight employing, ask for the total light flux Φ=n Φ i in LED-backlit source, then according to the parameters such as transmitance of backlight optical system, obtain the mean flow rate L in LED-backlit source, then the full frame brightness excursion everywhere of the brightness uniformity in LED-backlit source requirement is L ± Δ L (Δ L=7.5%L).
(3) measure the Luminance Distribution function of single LEDs after the backlight optical system with color analysis instrument.Concrete grammar is: be the center with LED, choose several test points in level respectively with vertical and other directions, measure its brightness value, obtain the Luminance Distribution function L=f (x of LED then by match, y), it is the center that x and y are respectively with LED, any 1 range coordinate on the plane to LED, and L is the brightness of arbitrfary point.
(4) calculating of the non-homogeneous arrangement pitches of LED.Known single LEDs is of a size of la (length) * lb (wide), at first place first LEDs at the edge of backlight (is example with the horizontal direction), the spacing at adjacent two LEDs centers may be the arbitrary value between la (lb) and the l/2, based on the actual application requirements, the step-length that the LED arrangement pitches changes is got Δ l, promptly, the probable value of any two LEDs arrangement pitches is la, la+ Δ l, la+2 Δ l, la+3 Δ l... finishes up to l/2, no matter is that the level or the arrangement of vertical direction are symmetric arrays in addition.
When LED number n a was odd number, then the center was k=(na-1)/2+1.The brightness value computational methods of arbitrfary point are as follows:
For Di=la: Δ l:l/2; The possible arrangement pitches of second LEDs (first and)
For Di+1=Di: Δ l:l/2; The possible arrangement pitches of the 3rd LEDs (second and)
For Di+2=Di+1: Δ l:l/2; The possible arrangement pitches of the 4th LEDs (the 3rd and)
……
For Dk-1=Dk-2: Δ l:l/2; The possible arrangement pitches of K LEDs (K-1 and)
Dk＝Dk-1，Dk+1＝Dk-2......Dna-1＝D1；
Li=f (1)+f (2)+f (3) ... + f (na) (the brightness calculation method of arbitrfary point)
When LED number n a was even number, then the center was between k=na/2 and k+1.The brightness value computational methods of arbitrfary point are as follows:
For Di=la: Δ l:l/2; The possible arrangement pitches of second LEDs (first and)
For Di+1=Di: Δ l:l/2; The possible arrangement pitches of the 3rd LEDs (second and)
For Di+2=Di+1: Δ l:l/2; The possible arrangement pitches of the 4th LEDs (the 3rd and)
……
For Dk-1=Dk-2: Δ l:l/2; The possible arrangement pitches of K LEDs (K-1 and)
For Dk=Dk-1: Δ l:l/2; The possible arrangement pitches of K+1 LEDs (K and)
Dk+1＝Dk-1，Dk+2＝Dk-2......Dna-1＝D1；
Li=f (1)+f (2)+f (3) ... + f (na) (the brightness calculation method of arbitrfary point)
Satisfy the requirement of brightness uniformity as Li, then note all corresponding LED arrangement pitches data groups, the arrangement pitches database that calculates as second test point brightness value.According to the LED arrangement pitches database that first test point filters out, calculate the brightness value of second LED of test point place, select the data group that second test point of sening as an envoy to satisfies brightness uniformity, as the arrangement pitches database of the 3rd test point brightness value calculating.By that analogy, can obtain making last test point to satisfy the LED arrangement pitches data group of brightness uniformity requirement, also just obtain making all test point brightness values to satisfy the array data group of uniformity requirement.In the data group that these meet the demands, obtain the array data group of the mean square deviation minimum that makes all test point brightness values, be the non-homogeneous LED arrangement pitches of being asked.The distance computation formula and the horizontal direction of vertical direction are similar, and the probable value that is any two LEDs arrangement pitches is lb, lb+ Δ l, and lb+2 Δ l, lb+3 Δ l... finishes up to l/2.
(5) on the basis that calculates the non-homogeneous arrangement pitches of LED, evenly distributed LED is adjusted, thereby obtain the LED-backlit source of brightness uniformity.
In the side entrance back source apparatus, according to the one dimension distribution function of LED lighting tube brightness, calculate along the arrangement pitches of each LED fluorescent tube of circuit board direction along circuit board, generally, arrangement pitches is a unequal-interval.
In the direct-type backlight source apparatus, calculate in the backlight LED fluorescent tube arrangement pitches and arrangement mode for arranging along level and vertical direction according to the bivariate distribution function of LED fluorescent tube.
In the direct-type backlight source apparatus, with the LED-backlit source that level and vertical direction are arranged, the spacing between the LED that horizontal direction and vertical direction are arranged is unequal.
In the direct-type backlight source apparatus, the LED of level and vertical direction all is unequal-interval and arranges, and the unequal-interval arrangement mode of level and vertical direction can be identical, also can be different.
Claims (1)
1. method that improves LED-backlit source brightness uniformity, it is characterized in that: according to the characteristic parameter of LED and the optical system characteristics of backlight source module, measure the Luminance Distribution function of LED, calculate the brightness of arbitrfary point in the backlight, under the situation that the brightness uniformity that guarantees the arbitrfary point meets design requirement, obtain the arrangement pitches and the arrangement mode of LED fluorescent tube, concrete steps are:
(1) at first, according to the required LED number n of backlight arrangement and the size in LED-backlit source, calculate LED distance between LED when evenly distributed, in the side entrance back source apparatus, the backlight side length overall of placing LED is d, and the uniform arrangement pitches of LED is a=d/ (n-1); In the direct-type backlight source apparatus, the LED-backlit source is of a size of l (length) * w (wide), the LED quantity nb that arranges on LED quantity na that length direction is arranged and the cross direction satisfies na * nb=n, and then the arrangement pitches of LED is respectively l/ (na-1) and w/ (nb-1) on length and the cross direction;
(2) according to the luminous flux phi i of single LEDs and the LED number n of backlight employing, ask for the total light flux Φ=n Φ i in LED-backlit source, then according to the transmitance parameter of backlight optical system, obtain the mean flow rate L in LED-backlit source, then the full frame brightness excursion everywhere of the brightness uniformity in LED-backlit source requirement is L ± Δ L (Δ L=7.5%L);
(3) measure the Luminance Distribution function of single LEDs after the backlight optical system with color analysis instrument, concrete grammar is: be the center with LED, choose several test points in level respectively with vertical and other directions, measure its brightness value, then by match obtain LED Luminance Distribution function L=f (x, y), it is the center that x and y are respectively with LED, any 1 range coordinate on the plane to LED, L is the brightness of arbitrfary point;
(4) calculating of the non-homogeneous arrangement pitches of LED, known single LEDs is of a size of la (length) * lb (wide), at first place first LEDs at the edge of backlight (is example with the horizontal direction), the spacing at adjacent two LEDs centers may be the arbitrary value between la (lb) and the l/2, based on the actual application requirements, the step-length that the LED arrangement pitches changes is got Δ 1, the probable value that is any two LEDs arrangement pitches is la, la+ Δ 1, la+2 Δ 1, la+3 Δ 1... finishes up to l/2, and the arrangement of level and vertical direction is symmetric arrays;
When LED number n a was odd number, then the center was k=(na-1)/2+1.The brightness value computational methods of arbitrfary point are as follows:
for?Di＝la:Δ1:l/2；
I gets 1 to k-1, tries to achieve the possible arrangement pitches Di of i and i+1 LEDs;
Dk＝Dk-1，Dk+1＝Dk-2......Dna-1＝D1；
Li＝f(1)+f(2)+f(3)…+f(na)；
I gets 1 to na, and Li represents the brightness value that i is ordered, and f (j) represents j the brightness value that LED is ordered at i;
When LED number n a was even number, then the center was between k=na/2 and k+1.The brightness value computational methods of arbitrfary point are as follows:
for?Di＝la:Δ1:l/2；
I gets 1 to k, tries to achieve the possible arrangement pitches Di of i and i+1 LEDs;
Dk+1＝Dk-1，Dk+2＝Dk-2......Dna-1＝D1；
Li＝f(1)+f(2)+f(3)…+f(na)；
I gets 1 to na, and Li represents the brightness value that i is ordered, and f (j) represents j the brightness value that LED is ordered at i;
The distance computation formula and the horizontal direction of vertical direction are similar, and the probable value that is any two LEDs arrangement pitches is lb, lb+ Δ 1, and lb+2 Δ 1, lb+3 Δ 1... finishes up to l/2,
Arrangement pitches according to calculating gained level and vertical direction is adjusted evenly distributed LED, thereby obtains the LED-backlit source of brightness uniformity.
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