CN102102824B - LED (light emitting diode) backlight module, LCD (liquid crystal display) display panel and liquid crystal display television - Google Patents

Abstract

The invention is suitable for the field of liquid crystal display, provides an LED (light emitting diode) backlight module, an LCD (liquid crystal display) display panel and a liquid crystal display television, wherein the LED backlight module comprises a light guide plate, a side face backlight LED array and an LED backlight control module; the side face backlight LED array is positioned at the periphery of the light guide plate, and is divided into a plurality of regions, and each region comprises at least one LED; and the LED backlight control module is used for controlling each region in the side face backlight LED array to achieve the luminous brightness of corresponding brightness requirement values. According to the invention, region control of the backlight module of the liquid crystal display is carried out in an LED side illumination mode, and the purposes of reducing the power consumption and improving the image display quantity are achieved.

Description

A kind of LED-backlit module, LCD display floater and LCD TV

Technical field

The invention belongs to field of liquid crystal display, relate in particular to a kind of LED-backlit module, LCD display floater and LCD TV.

Background technology

At present, in the LCDs of the LCD TV that adopts LED side illumination mode, some backlight modules do not adopt dynamic backlight to control, and some backlight modules just adopt the dynamic backlight control mode of the overall situation, can not realize the local dynamic station backlight control to LCDs.

Along with the size of LCD TV is increasing, if LCDs wherein can not adopt dynamic backlight to control, LCD TV just can not determine brightness backlight according to the image demand so, causes the waste of power consumption, not energy-conserving and environment-protective.

Summary of the invention

The purpose of the embodiment of the present invention is to provide a kind of LED-backlit module, and the display screen that is intended to solve LCD TV can not adopt dynamic backlight to control, and causes LCD TV can not determine according to the image demand problem of luminosity.

The embodiment of the present invention is achieved in that a kind of LED-backlit module, comprises LGP, and described backlight module also comprises:

Side LED array backlight is positioned at described LGP surrounding, is divided into a plurality of zones, and each zone comprises at least one LED; And

The LED-backlit control module, the regional that is used for controlling described side LED array backlight sends the luminosity of corresponding bright requirements;

The effect that in LCDs, any one pixel position (x, y) presents is comprised of luminosity and aperture opening ratio, wherein,

Luminosity corresponding to any one pixel position (x, y) is:

${\mathrm{BL}}^{\′}=\underset{m=1}{\overset{M}{\mathrm{\Σ}}}\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{K}_{(m,n)}\×f_{(m,n)}(x,y),$ Wherein,

The span of n is 1～N, represents the position of LED in transverse side LED array backlight;

The span of m is 1～M, represents the position of LED in the LED array backlight of vertical side;

K _{(m, n)}The luminosity of expression (m, n) individual LED;

K _{(m, n)}* f _{(m, n)}(x, y) is the luminosity of (m, n) individual LED any pixel position (x, y) on LCDs;

Aperture opening ratio corresponding to any one pixel position (x, y) is:

Wherein, BL is a constant when not adopting dynamic backlight, data ^αThe aperture opening ratio of liquid crystal pixel when not adopting dynamic backlight.

Another purpose of the embodiment of the present invention is to provide a kind of LCD display floater that adopts above-mentioned LED-backlit module.

Another purpose of the embodiment of the present invention is to provide a kind of LCD TV that adopts above-mentioned LED-backlit module.

The embodiment of the present invention is carried out subregion by the backlight module to the LCDs that adopts LED side illumination mode and is controlled, realization is in the large scale liquid crystal TV, LCDs is adopted the local dynamic station backlight control, can reach the purpose that reduces power consumption, improves image displaying quality.

Description of drawings

Fig. 1 is the structure chart of the LED-backlit module that provides of the embodiment of the present invention;

Fig. 2 is the schematic diagram that in the side LED array backlight that provides of the embodiment of the present invention, the LED subregion distributes;

Fig. 3 is LCDs 4 * 3 partitioned organization exemplary plot that the embodiment of the present invention provides.

The specific embodiment

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

The embodiment of the present invention is carried out subregion by the backlight module to the LCDs that adopts LED side illumination mode and is controlled, and realizes in the large scale liquid crystal TV, LCDs being adopted the local dynamic station backlight control.

Fig. 1 shows the structure of the LED-backlit module that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.

One of key component that this LED-backlit module is the LCD display panels can be widely used in the electronic products such as LCD TV, monitor, notebook computer, digital camera and projector.

The line source that LGP 1 is responsible for side LED array 2 backlight is sent is converted into uniform area source.

Side LED array 2 backlight is positioned at the surrounding of LGP 1.

In embodiments of the present invention, side LED array 2 backlight is divided into some zones, each zone comprises one or more LED, and each zone can be controlled separately by LED-backlit control module 3.

LED-backlit control module 3 is according to the specific requirement that shows image, and the regional in the LED array 2 backlight of control side sends the luminosity of corresponding bright requirements, reaches the purpose of local dynamic station backlight control.

In embodiments of the present invention, the lateral part in the LED array 2 backlight of side is divided into N zone, longitudinal component is divided into M zone, and each zone comprises one or more LED, and each zone can be controlled separately by LED-backlit control module 3.

LED-backlit control module 3 is according to the specific requirement that shows image, and in the LED array 2 backlight of control side, regional sends brightness size backlight.

Backlightly be divided into M * N zone due to what side LED array 2 backlight sent, therefore, LCDs also has been divided into M * N zone, and each regional luminosity depends on that the backlight illumination that this regional side LED array 2 backlight sends is big or small.

In embodiments of the present invention, the distribution mode of employing LED array 2 backlight according to the side is determined the mode of partitioned organization, as shown in Figure 2, in design, transversely one or more LED are independent controlled, specifically decide according to complexity and the tolerance degree to drive circuit in actual design.

As shown in Figure 2, horizontal one total M/group LED, in the horizontal with each/M of the centre position distribution of group LED is regional.Suppose that in the vertical every side has N/group LED, these LED are also independent can controls simultaneously, in the vertical with each/N zone of centre position distribution of group LED, so LCDs just can be divided into M * N regional.

In the embodiment of the present invention, statistics with histogram is carried out in each zone, with the maximum of each statistics with histogram as this regional brightness requirements.

As the preferred embodiments of the present invention, also can search for gray level downwards by certain rule by maximum gray scale from histogram, search the gray level of a pre-selected rule regulation as the brightness requirements, for example from maximum gray scale this position downwards by gray level statistical pixel data summation, if pixel data is more than or equal to certain limit value, this gray level is exactly the brightness demand so.

Suppose that in histogram, maximum gray scale is 210, the pixel count on 210 gray levels is that the pixel count of 100,209 gray levels is 0 simultaneously, the pixel count of 208 gray levels is 20, the pixel count of 207 gray levels is that the pixel count of 140,206 gray levels is that the pixel count of 16,205 gray levels is 300, ...., the regulation limit value is 250, begins to carry out pixel count statistics, 100+0+20＜250 from gray level 210,100+0+20+140＞250 can think that 208 are the luminosity demand.

Take 4 * 3 partitioned organizations of display panels 1 and LGP 1 as example, as shown in Figure 3:

At first, suppose each regional brightness contribution only from the corresponding LED of its corresponding ranks axle upper side LED array backlight, actual optical profile can be decided not for only being subject to this four LED certainly.Then, determine respectively the brightness contribution coefficient of four/group LED, simple method be brightness demand mean allocation that each is regional to four of correspondence/organize on LED, for example 200 regional luminance demand just can determine that the LED brightness of U2, D2, L2, R2 is all 50.

Certainly, also can establish respectively four luminance factors, KmnU, KmnD, KmnL, KmnR, m=1,2,3,4, n=1,2,3 to each zone; Also take 200 zone as example, K22U=K22D=1/4, K22L=2.5/8, K22R=1.5/8, four coefficients and be 1, so U1=D1=50, and L1=38, R1=62.The setting of above-mentioned coefficient can be processed according to the attenuation of actual luminosity.

By above-mentioned step, the luminosity of four/group LED can be determined in a zone, but the one/group LED of side LED array 2 backlight has more than corresponding zone, the brightness that 100 the zone on 99 the right also can draw a L1 and R1, processing mode at this moment is for keeping the brightness value of a maximum LED.

Take L1 as example, 99 can obtain the brightness value of a L1, and simultaneously 100,170,168 brightness values that can obtain L1, compare these four values, choose a wherein maximum numerical value and get final product as the brightness value of L1.

In embodiments of the present invention, quick variation due to image, may cause that LED brightness data obtained above changes more violent, so must adopt the process of LED smoothing processing, this process can make temporal level and smooth, also to introduce simultaneously the level and smooth of space, make transition backlight more even.

Although determined the brightness of each LED, but because the distance of each the pixel distance LED on whole screen is different, namely luminosity corresponding to each pixel might be different, and the difference of luminosity, when image does not compensate, will produce apparent in view distortion.

In embodiments of the present invention, the luminosity of each pixel can be determined as follows.

At first, need to carry out one-shot measurement to the LED Luminance Distribution in the LED array 2 backlight of side, obtain a distribution function K on LCDs _{(m, n)}* f _{(m, n)}(x, y), wherein, the span of n is 1～N, represents the position of LED in transverse side LED array 2 backlight; The span of m is 1～M, represents the position of LED in the LED array 2 backlight of vertical side; Location of pixels in (x, y) expression LCDs; K _{(m, n)}The luminosity of expression (m, n) individual LED.Therefore, K _{(m, n)}* f _{(m, n)}(x, y) just represented (m, n) individual LED luminosity that any pixel position (x, y) can provide on LCDs.

Considered that a plurality of LED are luminous, the total brightness backlight of any one pixel position (x, y) is so:

${\mathrm{BL}}^{\′}=\underset{m=1}{\overset{M}{\mathrm{\Σ}}}\underset{n=1}{\overset{N}{\mathrm{\Σ}}}{K}_{(m,n)}\×f_{(m,n)}(x,y)---\left(1\right)$

In the embodiment of the present invention, the effect that pixel presents is comprised of aperture opening ratio two parts of luminosity and liquid crystal pixel, and aperture opening ratio is determined by the data of pixel, can be write as following formula:

B _Pixel＝f(data ^α×BL) (2)

If do not have dynamic backlight, can think that BL is a constant, the composition of image is determined by pixel data so, if employing dynamic backlight, luminosity BL are not a constant, need to consider, otherwise distortion will occur, formula (2) can be rewritten as formula (3):

B _Pixel＝f(data ^α×BL)＝f(data ^α′×BL′) (3)

In normal circumstances, function f () is a monotonic function, so according to formula (3), can obtain:

data ^α×BL＝data ^α′↑×BL′↓ (4)

Can see according to formula (4) guaranteeing that under both product permanence conditions, both variation tendencies are opposite, therefore, can obtain the aperture opening ratio at the liquid crystal pixel that adopts dynamic backlight:

${\mathrm{data}}^{\mathrm{\α}\′}=\frac{{\mathrm{data}}^{\mathrm{\α}}\×\mathrm{BL}}{{\mathrm{BL}}^{\′}}---\left(5\right)$

The embodiment of the present invention is carried out subregion by the backlight module to the LCDs that adopts LED side illumination mode and is controlled, realization is in the large scale liquid crystal TV, LCDs is adopted the local dynamic station backlight control, can reach the purpose that reduces power consumption, improves image displaying quality.

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

Claims (6)

1. a LED-backlit module, comprise LGP, it is characterized in that, described backlight module also comprises:

Side LED array backlight is positioned at described LGP surrounding, is divided into a plurality of zones, and each zone comprises at least one LED; And

The LED-backlit control module, the regional that is used for controlling described side LED array backlight sends the luminosity of corresponding bright requirements;

The effect that in LCDs, any one pixel position (x, y) presents is comprised of luminosity and aperture opening ratio, and wherein, luminosity corresponding to any one pixel position (x, y) is:

Wherein,

The span of n is 1～N, represents the position of LED in transverse side LED array backlight;

The span of m is 1～M, represents the position of LED in the LED array backlight of vertical side;

K _{(m, n)}The luminosity of expression (m, n) individual LED;

K _{(m, n)}* f _{(m, n)}(x, y) is the luminosity of (m, n) individual LED any pixel position (x, y) on LCDs;

Aperture opening ratio corresponding to any one pixel position (x, y) is:

Wherein, BL is a constant when not adopting dynamic backlight, data ^αThe aperture opening ratio of liquid crystal pixel when not adopting dynamic backlight.

2. LED-backlit module as claimed in claim 1, is characterized in that, statistics with histogram is carried out in each zone, with the maximum of each statistics with histogram as this regional brightness requirements.

3. LED-backlit module as claimed in claim 1, is characterized in that, described brightness requirements is searched for gray level downwards by maximum gray scale from histogram and determined.

4. LED-backlit module as claimed in claim 1, is characterized in that, when determining described brightness requirements, takes the LED smoothing processing.

5. LCD display floater that adopts the LED-backlit module of the arbitrary claim of claim 1 to 4.

6. LCD TV that adopts the LED-backlit module of the arbitrary claim of claim 1 to 4.

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