CN101435947A - Arrangement mode of LED backlight module unit and LED liquid crystal backlight screen - Google Patents

Abstract

The invention is suitable for the field of liquid crystal display and provides an arrangement mode for an LED backlight module and an LED liquid crystal backlight screen; the backlight module consists of a plurality of LED luminous clusters; the periphery of any LED luminous cluster is provided with six LED luminous clusters which have the same distance with the LED luminous cluster; the six LED luminous clusters form a hexagon; and one LED luminous cluster consists of at least one LED. The arrangement mode for the LED luminous clusters overcomes the defects of uneven brightness distribution of a square arrangement mode and can realize accurate adjustment on the brightness of light through adjusting the distance between the LED luminous clusters. The arrangement mode and the LED liquid crystal backlight screen utilizing the arrangement mode have the advantages of more stable structure, less LED number, lower cost, more even brightness, better display effect and the like.

Description

A kind of arrangement mode of LED-backlit module and LED liquid crystal backlight screen

Technical field

The invention belongs to field of liquid crystal display, relate in particular to a kind of arrangement mode and LED liquid crystal backlight screen of LED-backlit module.

Background technology

Adopt light emitting diode (Light Emitting Diode, LED) as the display screen of backlight have that high brightness, vision are long-range, clear picture, bright in luster, good stability, low in energy consumption, advantage such as light efficiency is high, the life-span is long, be widely used in fields such as televisor, mobile phone, video camera, notebook computer.At present liquid crystal backlight screen in the LCD TV (Liquid Crystal Display, LCD) adopt cold-cathode fluorescence lamps (ColdCathode Fluorescent Lamps, CCFL) and LED as backlight.Visual angle, LED-backlit source is big, brightness is high, beautiful in colour, have plurality of advantages, along with the maturation of LED-backlit technology, will become the main flow backlight of LCD display.

As backlight, one or more LED combines and forms the luminous family of LED, and the luminous group composition of several LED module backlight is arranged in equably on the two dimensional surface substrate according to certain how much rules, thereby forms the backlight screen that produces uniform light.The quality of backlight display performance is weighed from aspects such as brightness, colourity, homogeneity, heats.LED-backlit module of the prior art adopts the arrangement mode of square matrix more, and Fig. 2 shows the LED-backlit module and is foursquare arrangement mode.Four luminous families of LED surround a square as foursquare four summits, and the entire backlight screen is evenly arranged according to square rule by the LED-backlit module of the luminous group composition of a plurality of LED and formed.

Fig. 3 shows the LED-backlit module and is the two-dimentional intensity map that square is arranged.The brightness at the square vertices place that four luminous families of LED surround is the highest, and the place's brightness of square diagonal line is minimum.

The difference in brightness of bright spot and dim spot is very big on the backlight screen as can be seen, and the arrangement mode of this square or rectangular also is unfavorable for the even distribution of light.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of arrangement mode of LED-backlit module, is intended to solve the uneven problem of backlight illumination under the existing arrangement mode.

The embodiment of the invention is to realize like this, a kind of arrangement mode of LED-backlit module, it is characterized in that: described module backlight is by the luminous group composition of a plurality of LED, six luminous families of equidistant with it LED are arranged around the luminous family of any one LED, hexagon of the luminous group composition of described six LED, the luminous family of LED is made up of at least one LED.

The luminous family of described LED can be the monochromatic luminous family of LED, also can be the luminous family of LED of polyenergetic.

The luminous family of described monochromatic LED can be made up of the LED of red, green, blue and white.

The luminous family of described polyenergetic LED can be that a plurality of LED of three of three looks or at least three kinds of different colours form, and reaches white balance.

Described hexagon arrangement mode can be orthohexagonal arrangement mode.

Another purpose of the embodiment of the invention is to provide a kind of LED liquid crystal backlight screen, it is characterized in that, the LED-backlit module of described LED liquid crystal backlight screen is arranged according to above-mentioned hexagonal array.

Owing to LED-backlit module of the prior art be foursquare arrangement mode be improved to hexagonal arrangement mode, the arrangement mode of LED-backlit module provided by the invention and use the LED liquid crystal backlight screen of this arrangement mode to have advantages such as the LED number is few under Stability Analysis of Structures, the homalographic, brightness is more even, cost is lower, display effect is better.

Description of drawings

Fig. 1 is a single monochromatic LED intensity map;

Fig. 2 is that the LED-backlit module is the synoptic diagram that square is arranged;

Fig. 3 is that the LED-backlit module is the two-dimentional intensity map that square is arranged;

Fig. 4 is that the LED-backlit module that the embodiment of the invention provides is the synoptic diagram that regular hexagon is arranged;

Fig. 5 is that the LED-backlit module that the embodiment of the invention provides is the two-dimentional intensity map that regular hexagon is arranged;

Fig. 6 is that the LED-backlit module is the three-dimensional luminance distribution plan that square is arranged;

Fig. 7 is that the LED-backlit module that the embodiment of the invention provides is the three-dimensional luminance distribution plan that regular hexagon is arranged;

Fig. 8 is that monochromatic LED module backlight that the embodiment of the invention provides is the regular hexagon synoptic diagram of arranging;

Fig. 9 is that three looks, three LEDs module backlight that the embodiment of the invention provides is the regular hexagon synoptic diagram of arranging;

Figure 10 is that three looks, four LEDs module backlight that the embodiment of the invention provides is the regular hexagon synoptic diagram of arranging;

Figure 11 is that three looks, five LEDs module backlight that the embodiment of the invention provides is the regular hexagon synoptic diagram of arranging.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

The LED liquid crystal backlight screen that the invention provides a kind of arrangement mode of LED-backlit module and adopt this arrangement mode, module backlight is by the luminous group composition of a plurality of LED, six luminous families of equidistant with it LED are arranged around the luminous family of any one LED, and hexagon of the luminous group composition of these six LED, the luminous family of LED is made up of at least one LED.The present invention adopts hexagonal arrangement mode to replace the square of prior art to arrange, and makes that the Luminance Distribution of backlight is more even, and adopts the luminous family of less LED number can reach the brightness requirement of backlight in the market.

Fig. 1 shows the Luminance Distribution of single monochromatic LED.The circle centre position brightness maximum of circular speck among the figure, far away more from the center of circle, brightness weakens successively, and the peripheral brightness of circular speck is minimum.

The LED-backlit module that Fig. 4 shows the embodiment of the invention to be provided is the synoptic diagram that regular hexagon is arranged.The luminous family of LED that the embodiment of the invention is made up of six LED surrounds a regular hexagon and arranges, the entire backlight screen is arranged by such regular hexagon array rule, get wherein the LED (e of two LED that face mutually and hexagonal centre, f, g) surround an equilateral triangle, three LED are as three summits of equilateral triangle.

In order to prove that regular hexagon has more uniform Luminance Distribution than foursquare arrangement mode, suppose no matter be to adopt which kind of arrangement mode, the number of the luminous family of needed LED is identical on the unit area.If there is not this prerequisite, even adopt foursquare arrangement mode, if the luminous family of more LED quantity is arranged on the unit area, the distance of each luminous family of LED is enough near, and adopt orthohexagonal arrangement mode, use the luminous family of LED number still less on the unit area, so just may cause the homogeneity of square arrangement mode brightness better.

Comparison diagram 2 and Fig. 4 establish the luminous e of family of three LED among Fig. 4, the distribution that f, g are equilateral triangle, and half of its length of side is h, and the foursquare length of side that the luminous a of family of four LED among Fig. 2, b, c, d surround is L.

The calculating of the number/area of the luminous family of LED can be calculated by the equilateral triangle that three the luminous e of family of LED, f, g surround among Fig. 4.At first calculate the number of the luminous family of LED,, can determine according to the shared ratio of the number of degrees of angle because the luminous family of LED on the summit of equilateral triangle, obviously can not calculate the luminous family of the LED on the summit as a complete number.The number of a luminous family of LED that equilateral triangle enclosed is

The area of equilateral triangle is

$\frac{1}{2}2h*\sqrt{4h^2-{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}=\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2.$

The luminous family of LED number in the square that four the luminous a of family of LED, b, c, d surround among Fig. 2 is

Tetragonal area is

L ²。

The interior luminous family of LED of the unit area number that guarantees two kinds of arrangement modes is identical, must make

$\frac{\frac{1}{2}\left(\mathrm{led}\right)}{\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}=\frac{1\left(\mathrm{led}\right)}{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}\&DoubleRightArrow;L=\sqrt[4]{12}\mathrm{hB}1.861h.$

As can be seen from the above analysis, the square length of side that square is arranged under the homalographic is the equilateral triangle length of side that regular hexagon is arranged

Doubly, i.e. the luminous family of the LED number of regular hexagon arrangement mode use still less.

Fig. 5 is that the LED-backlit module that the embodiment of the invention provides is the two-dimentional intensity map that regular hexagon is arranged.The brightness at place, six summits of the regular hexagon that LED surrounds is the highest, and orthohexagonal center brightness is minimum.Comparison diagram 3 and Fig. 5, the orthohexagonal arrangement mode of Fig. 5 are obviously brighter than the light that the foursquare arrangement mode of Fig. 3 produces.The clear zone that Fig. 5 regular hexagon is arranged is bigger, and the dark space is littler, and light luminance is more even.

Fig. 6 shows the LED-backlit module and is the three-dimensional luminance distribution plan that square is arranged, and the LED-backlit module that Fig. 7 shows the embodiment of the invention to be provided is the three-dimensional luminance distribution plan that regular hexagon is arranged.Compare two figure, the peak of Fig. 6 and minimum point difference are bigger, and peak shown in Figure 7 and minimum point difference are littler, and Luminance Distribution is more even.

	The square layout mode	The equilateral triangle layout type
			Maximal value	265	262
Minimum value	98	127
			Difference	167	135

Table 1

The Luminance Distribution of two kinds of distribution modes of contrast, table 1 has specifically illustrated the maximal value and the minimum value of two kinds of distribution modes, and both differences.From the difference of orthohexagonal as can be seen arrangement mode maximal value of list data and minimum value only is 135, and light has better homogeneity.Simultaneously this means that also orthohexagonal arrangement mode can adopt the luminous family of less LED quantity if be consistent to the uniformity requirement of dual mode, and this obviously has more profound significance to the development of industry.

	The square layout mode	The equilateral triangle layout type
			Maximal value	265	256
Minimum value	98	87
			Difference	167	169

Table 2

Suppose to obtain maximum, the minimum difference identical, only need the spacing of the luminous family of LED of increase regular hexagon arrangement mode with square arrangement mode.The square length of side of supposing square arrangement mode still is L, use the Matlab software simulation can obtain obtaining and 167 differences that hardly differ 169 when the spacing of three luminous families of LED as shown in Figure 4 (ab, ac, bc) under the regular hexagon arrangement mode increases to 2.2h, as shown in table 2.

This moment, an equilateral triangle area was:

$\frac{1}{2}2\&times;\left(1.1h\right)\&times;\sqrt{4{\left(1.1h\right)}^2-{\left(1.1h\right)}^2}=\sqrt{3}{\left(1.1h\right)}^2=1.21\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2,$

The number of the luminous family of LED in the unit area is:

$\frac{\frac{1}{2}\left(\mathrm{led}\right)}{1.21\&times;\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2},$

And the LED number in the unit area of square arrangement mode is:

$\frac{\frac{1}{2}\left(\mathrm{led}\right)}{\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2},$

So, the regular hexagon arrangement mode is compared the LED number number percent of saving and is with square arrangement mode:

$\left(\frac{\frac{\frac{1}{2}\left(\mathrm{led}\right)}{\sqrt{3}{h}^2}-\frac{\frac{1}{2}\left(\mathrm{led}\right)}{1.21\&times;\sqrt{3}{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="A200710124706E00121.png"\; state="\{\{state\}\}">h</figure-callout>}}^2}}{\frac{\frac{1}{2}\left(\mathrm{led}\right)}{\sqrt{3}{h}^2}}\right)\&times;100\%=\left(\frac{1-\frac{1}{1.21}}{1}\right)\&times;100\%B17\%.$

From above-mentioned data as can be seen, if when the luminance difference of regular hexagon arrangement mode adopts with the close difference of square arrangement mode, the LED number of regular hexagon arrangement mode can save 17%.We can realize the accurate adjusting to light luminance, to satisfy actual needs by the adjusting to the luminous family of LED spacing.

The luminous family of LED that fact Example of the present invention is used for demonstration backlight can be the monochromatic luminous family of LED, it also can be the luminous family of LED of polyenergetic, wherein the luminous family of monochromatic LED can be made up of the LED of red, green, blue and white, the luminous family of polyenergetic LED can be that a plurality of LED of three of three looks or at least three kinds of different colours form, and reaches white balance.As several embodiments of the present invention, Fig. 8, Fig. 9, Figure 10, Figure 11 show the luminous family of monochromatic LED, the luminous family of three looks, three LEDs, the luminous family of three looks, four LEDs and the luminous family of three looks, five LEDs respectively and are the synoptic diagram that regular hexagon is arranged.Triangle, square, LED that circular pattern is represented three kinds of colors (R, G, B) respectively, the LED dense arrangement is formed a luminous family of LED together, and arranging by regular hexagon is distributed on the entire backlight screen again.According to different needs, can select different LED-backlit modules to make the LED-backlit backlight screen.

The distribution mode of the luminous family of LED can adopt approximate orthohexagonal hexagon arrangement mode in actual production, and promptly hexagon can not be the regular hexagon of a standard, and any hexagon arrangement mode all is included in the protection domain of patent of the present invention.

The arrangement mode of LED-backlit module has overcome the uneven shortcoming of square arrangement mode Luminance Distribution, by the adjusting to the luminous family of LED spacing, has realized the accurate adjusting to light luminance.This arrangement mode and utilize that the LED liquid crystal backlight screen of this arrangement mode has that structure is more stable, the LED number still less, advantage such as cost is lower, brightness is more even, display effect is better.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1, a kind of arrangement mode of LED-backlit module, it is characterized in that, described module backlight is by the luminous group composition of a plurality of LED, six luminous families of equidistant with it LED are arranged around the luminous family of any one LED, hexagon of the luminous group composition of described six LED, the luminous family of LED is made up of at least one LED.

2, arrangement mode as claimed in claim 1 is characterized in that, the luminous family of described LED is the monochromatic luminous family of LED, the luminous family of perhaps polyenergic LED.

3, arrangement mode as claimed in claim 2 is characterized in that, the luminous family of described monochromatic LED is made up of the LED of red, green, blue or white.

4, arrangement mode as claimed in claim 2 is characterized in that, the luminous family of described polyenergetic LED is that a plurality of LED of three of three looks or at least three kinds of different colours form, and reaches white balance.

5, arrangement mode as claimed in claim 1 is characterized in that, described hexagon arrangement mode is orthohexagonal arrangement mode.

6, arrangement mode as claimed in claim 1 or 2 is characterized in that, the luminous family of described LED is the luminous family of monochromatic LED.

7, arrangement mode as claimed in claim 1 or 2 is characterized in that, the luminous family of described LED is the luminous families of three looks, three LEDs.

8, arrangement mode as claimed in claim 1 or 2 is characterized in that, the luminous family of described LED is the luminous families of three looks, four LEDs.

9, arrangement mode as claimed in claim 1 or 2 is characterized in that, the luminous family of described LED is the luminous families of three looks, five LEDs.

10, a kind of LED liquid crystal backlight screen is characterized in that, the luminous family of the LED of described LED liquid crystal backlight screen adopts the described arrangement mode of claim 1.

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