CN103514839B - Side-in-type LED backlight source liquid crystal display dynamic dimming method and device - Google Patents

Abstract

Provided is a side-in-type LED backlight source liquid crystal display dynamic dimming method and device. A face plate is divided into m*n rectangular logic zones; then each rectangular logic zone is affiliated to an LED backlight lamp set which has the largest diffusion ratio on the rectangular logic zone; input image data are stored in a storage, and meanwhile target backlight of each rectangular logic zone is computed through input images; the brightness of each LED backlight lamp sets is determined through the four dimming steps. According to the method and the device, the four steps of a dimming algorithm are used, backlight power loss can be effectively lowered, and meanwhile image quality is enhanced, the brightness of each LED backlight lamp set is obtained, the four dimming steps are easy to achieve, for different side-in-type backlight types, an algorithm can be achieved flexibly by dividing the logic zones, and universality is strong.

Description

A kind of side entering-type LED backlight source liquid crystal display dynamic light adjustment method and device

Technical field

The invention belongs to LED backlight dynamic light adjustment technical field, relate to a kind of side entering-type LED backlight source liquid crystal display dynamic light adjustment method and device.

Background technology

Liquid crystal display comprises backlight module and liquid crystal panel two parts, for conventional method, the backlight of liquid crystal display is Chang Liang, gray level is realized by changing liquid crystal transmitance, shortcoming is that backlight power consumption is large, even if input picture is very dark, power consumption also can not reduce, and the contrast of picture also can reduce because of the born light leak of liquid crystal; Dynamic light adjustment is then dynamically adjust backlight illumination according to shown picture, reduces the backlight of dark areas, thus realizes the reduction of backlight power consumption, reduce light leak simultaneously, improves picture contrast, reaches the effect strengthening image quality.

The structure of LED backlight can be divided into multiple, mainly comprises straight-down negative and side entering type.Relative to straight-down negative, side entering type structure is thinner, and cost is lower.Simultaneously, in side entrance back source structure, the photoconduction that LED backlight group sends by light guide plate and reflector is in the process of screen regional, optical attenuator is comparatively serious, the light sent between different LED backlight group superposes mutually, thus causing the uneven diffusion of backlight, backlight illumination is difficult to accurate control, and these problems can increase the light modulation difficulty of side entering type structure.

Summary of the invention

The object of the present invention is to provide a kind of side entering-type LED backlight source liquid crystal display dynamic light adjustment method and device, the method and device can fully take into account uneven diffusion and the superposition mutually of LED-backlit, utilize backlight substantially, reach the effect reducing backlight power consumption, strengthen image quality.

In order to achieve the above object, side entering-type LED backlight source of the present invention liquid crystal display dynamic light adjustment method, comprises the following steps:

1) panel is divided into m × n rectangle logical partition; Then each rectangle logical partition is belonged to extremely maximum to its diffusion ratio LED backlight group; Wherein, the ratio of luminance brightness when diffusion ratio refers to that light that LED backlight group sends diffuses to rectangle logical partition and the initial luminance brightness of this LED backlight group;

2) view data of input is deposited in storer, utilize the image of input to calculate the target backlight of each rectangle logical partition simultaneously;

3) according to the target backlight of each rectangle logical partition, the final brightness of each LED backlight group is determined by following four step light;

3.1) according to the target backlight of rectangle logical partition, the original intensity lum_first of each LED backlight group is obtained;

3.2) superposition is carried out according to the original intensity lum_first of all LED backlight groups, obtain the backlight illumination of full frame each rectangle logical partition, then reduce the brightness that each LED backlight group is overflowed, obtain the second step brightness lum_second of each LED backlight group;

3.3) increased the brightness of LED backlight group deficiency by process of iteration, obtain the 3rd step brightness lum_third of LED backlight group; For iteration each time, first superposition calculation goes out the backlight illumination of each rectangle logical partition, then calculate each rectangle logical partition with target backlight photo than not enough brightness, then increase the brightness of LED backlight group deficiency, finally obtain the 3rd step brightness lum_third of each LED backlight group;

3.4) carry out superposition according to the 3rd step brightness lum_third of all LED backlight groups, obtain the backlight illumination of each rectangle logical partition; Then the backlight illumination of each rectangle logical partition and target backlight through and subtracting calculating, calculate the backlight of each rectangle logical partition deficiency, if LED backlight group corresponding to rectangle logical partition reaches high-high brightness, and the backlight illumination of this rectangle logical partition still discontented foot-eye backlight, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding, compensate the backlight illumination of this rectangle logical partition deficiency, obtain the final brightness lum_forth of each LED backlight group;

4) the final brightness lum_forth of each LED backlight group determined by four step light controls the display brightness of LED backlight group, utilize the final brightness lum_forth of each LED backlight group to carry out liquid crystal compensation to the view data in storer simultaneously, and utilize the control of the view data after compensating liquid crystal module to complete dynamic light adjustment.

In step 1), panel is divided into several rectangle logical partitions to carry out as follows:

Side entering-type LED backlight lamp group structure comprises monolateral side entering type structure, bilateral side entering type structure and four limit side entering type structures;

1.1) for monolateral side entering-type LED backlight source:

If settled n group LED at upper side edge or lower side, then panel is divided into m × n rectangle logical partition, wherein, m value meets the backlight illumination change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²; If settled m group LED backlight group on limit, left side or right edge, then panel is divided into m × n rectangle logical partition, wherein, n value meets the backlight illumination change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²;

1.2) for bilateral side entering-type LED backlight source:

If settled n group LED backlight group at upper and lower double side, then panel is divided into m × n rectangular sub-area, wherein, the backlight illumination change that m value meets rectangle logical partition is no more than L, and 0≤L≤100cd/m ²; If settled m group LED backlight group at left and right double side, then panel is divided into m × n rectangular sub-area, wherein, n value meets the brightness change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²;

1.3) for four limit side entering type LED backlight:

If settled m group LED at left and right side, upper and lower side has settled n group LED, then panel is divided into m × n rectangle logical partition.

Step 3.1) be adopt the original intensity lum_first obtaining each LED backlight group with the following method:

$\mathrm{lum}\_\mathrm{first}=\min (\mathrm{lum}\_\max ,\max (\frac{\mathrm{Goal}\_\mathrm{bl}\left(1\right)}{{\mathrm{\α}}_1},\frac{\mathrm{Goal}\_\mathrm{bl}\left(2\right)}{{\mathrm{\α}}_2}\·\·\·\frac{\mathrm{Goal}\_\mathrm{bl}\left(N\right)}{{\mathrm{\α}}_N}))$

Wherein, Goal_bl (1), Goal_bl (2) ... Goal_bl (N) is the target backlight of the N number of rectangle logical partition belonging to this LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, lum_max is the high-high brightness that LED backlight group can reach;

Step 3.2) be adopt the second step brightness lum_second that the brightness reducing each LED backlight group spilling with the following method obtains each LED backlight group:

lum_second=max(O,lum_first-Δlum_decrease)

Wherein:

$\mathrm{\Δlum}\_\mathrm{decrease}$

$=\min (\frac{\mathrm{\ΔBl}\_\mathrm{decrease}\left(1\right)}{{\mathrm{\α}}_1},\frac{\mathrm{\ΔBl}\_\mathrm{decrease}\left(2\right)}{{\mathrm{\α}}_2}\·\·\·\frac{\mathrm{\ΔBl}\_\mathrm{decrease}\left(N\right)}{{\mathrm{\α}}_N})$

Δ Bl_decrease (1), Δ Bl_decrease (2) ... the backlight illumination that Δ Bl_decrease (N) overflows the N number of rectangle logical partition belonging to LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, the backlight illumination of the N number of rectangle logical partition minimum spilling of Δ lumdecrease belonging to LED backlight group; If the backlight of rectangle logical partition is not overflowed, then corresponding Δ Bl_decrease (i)=0,1≤i≤N;

Step 3.3) be adopt the 3rd step brightness lum_third that the brightness increasing each LED backlight group deficiency with the following method obtains each LED backlight group:

lum_third _j=min(lum_max,lum_third _j-1+k _j·Δlum_increase _j)

Wherein:

$\mathrm{\Δlum}\_{\mathrm{increase}}_j$

$=\max (\frac{\mathrm{\ΔBl}\_\mathrm{increas}{e}_j\left(1\right)}{{\mathrm{\α}}_1},\frac{\mathrm{\ΔBl}\_\mathrm{increas}{e}_j\left(2\right)}{{\mathrm{\α}}_2}\·\·\·\frac{\mathrm{\ΔBl}\_\mathrm{increas}{e}_j\left(N\right)}{{\mathrm{\α}}_N})$

Δ Bl_increase _j(1), Δ Bl_increase _j(2) ... Δ Bl_increase _j(N) for N number of rectangle logical partition belonging to LED backlight group in jth time iteration is relative to the not enough backlight illumination of target backlight, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, △ lum_increase _jn number of rectangle logical partition belonging to LED backlight group is relative to the minimum not enough backlight illumination of target backlight; k _jbacklight amplification scale-up factor during iteration secondary to jth, M is iterations, and 1≤M≤100,1≤j≤M, 0 < k _j≤ 1; Lum_third _o=lum_second, lum_third=lum_third _m;

Step 3.4) adopt increase with the following method and the brightness of the LED backlight group of this rectangle logical partition non-corresponding, compensate the backlight illumination of this rectangle logical partition deficiency, obtain the final brightness lum_forth of each LED backlight group:

For each rectangle logical partition, according to the size order of diffusion ratio, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding successively, until the backlight illumination of this rectangle logical partition reaches the requirement of target backlight; The LED backlight group calculating all rectangle logical partition non-corresponding needs the brightness increased, when plural rectangle logical partition increases the brightness of same LED backlight group, by the maximal value of this LED backlight group brightness of increase stored in one dimension matrix lum_plus, finally lum_plus and lum_third is added, obtain the final brightness lum_forth of LED backlight group, the final brightness lum_forth of LED backlight group is no more than lum_max simultaneously, is shown below:

lum_forth=min(lum_max，lum_third+lum_plus)。

Described k _jmeet 0 < k ₁≤ k ₂≤ ... ≤ k _m≤ 1.

Realize a device for described side entering-type LED backlight source liquid crystal display dynamic light adjustment method, comprise image input module, memory module, calculating target backlight module, four step light algoritic modules and liquid crystal compensation module;

Image input module is for providing the view data of input and view data being sent to memory module and calculate target backlight module;

Memory module is for storing view data and view data being supplied to liquid crystal compensation module;

Calculate target backlight module for calculating target backlight and target backlight being supplied to four step light algoritic modules;

Four step light algoritic modules, for determining the final brightness lum_forth of each LED backlight group, utilize the final brightness lum_forth of each LED backlight group to control the display brightness of LED backlight group simultaneously;

Liquid crystal compensation module is used for carrying out liquid crystal compensation according to the final brightness of each LED backlight group to view data, and the view data after compensating the most at last is sent to liquid crystal module and completes dynamic light adjustment.

Wherein, described four step light algoritic modules comprise original intensity module, fall brightness module, fall brightness control module, iteration rises brightness module, rise surrounding brightness module, rise surrounding brightness control module, target backlight RAM module and diffusion ratio ROM module;

Original intensity module receives the target backlight of each rectangle logical partition to calculate the original intensity lum_first of each LED backlight group, and to falling brightness module and send the original intensity lum_first of each LED backlight group, simultaneously to the settling signal falling brightness control module and send original intensity module;

Target backlight RAM module provides target backlight to falling brightness module, iteration rises brightness module and rising surrounding brightness module;

Diffusion ratio ROM module provides diffusion ratio to falling brightness module, iteration rises brightness module and rising surrounding brightness module;

Fall brightness module calculate the second step brightness lum_second of each LED backlight group and send to iteration to rise brightness module and rise brightness module and send to falling brightness control module and iteration the settling signal falling brightness module, the settling signal falling brightness module starts iteration and rises brightness module;

Fall brightness control module fall brightness module according to the settling signal startup of original intensity module and fall brightness module according to the settling signal closedown of falling brightness module;

Iteration rises brightness module and calculates the 3rd step brightness lum_third of each LED backlight group and send to and rise surrounding brightness module, and the settling signal simultaneously iteration being risen brightness module sends to and rises surrounding brightness control module;

Rise surrounding brightness module calculate and export the final brightness lum_forth of each LED backlight group, the settling signal rising surrounding brightness module is sent to simultaneously and rise surrounding brightness control module;

The settling signal unlatching that liter surrounding brightness control module rises brightness module according to iteration rises surrounding brightness module and rises surrounding brightness module according to the settling signal closedown rising surrounding brightness module.

It is adopt the mode of cascade to realize that described iteration rises brightness module, and iteration rises brightness module and comprises M group and form submodule by iteration submodule and iteration control module; Each iteration submodule receives from the target backlight of target backlight RAM module and the diffusion ratio of diffusion ratio ROM module;

Iteration submodule receives the 3rd step brightness of the 3rd step brightness of each LED backlight group that a upper iteration submodule calculates each LED backlight group to the calculating of next iteration submodule transmission current iteration submodule, and the settling signal of current iteration submodule is also sent to current iteration control module and next step iteration control module by current sub-block simultaneously;

Each iteration control module controls startup and the stopping of current sub-block according to the settling signal of the settling signal of a upper iteration submodule and current iteration submodule.

Described iteration rises that brightness module realized by circulation feedback system; Iteration rises brightness module and is made up of an iteration submodule and an iteration control module,

The second step brightness lum_second of iteration submodule receiving target backlight, diffusion ratio and each LED backlight group, sends iteration settling signal and iterative feedback brightness to iteration control module;

The reception before starting iteration of iteration control module falls the settling signal of brightness module to control the startup of iteration submodule; After having carried out first time iteration, iteration control module starts iteration submodule again according to iteration settling signal, feedback brightness is inputed to iteration submodule by Simultaneous Iteration control module, circulation feedback like this, until iteration submodule runs M time, after end of run, iteration submodule exports the 3rd brightness lum_third of each LED backlight group to rising surrounding brightness module, and iteration submodule exports to rising surrounding brightness control module the settling signal that iteration rises brightness module.

Compared with prior art, beneficial effect of the present invention is:

The present invention fully takes into account uneven diffusion and the superposition mutually of LED-backlit, utilize four steps of light modulation algorithm, effectively can reduce backlight power consumption, strengthen image quality simultaneously, obtain the brightness of each LED backlight group, and four light modulation steps of the present invention are simple and easy to realize, can for different side entrance back type, implementation algorithm can be carried out, highly versatile neatly by dividing logical partition.The device that the present invention proposes can realize the method proposed effectively by the four step light algoritic modules wherein arranged, reach reduction backlight power consumption, strengthens the object of image quality.

Accompanying drawing explanation

Fig. 1 is that monolateral side entering type panel divides Division schematic diagram; Wherein, a is the schematic diagram of upper side edge LED backlight structure, and b is the schematic diagram of lower side LED backlight structure, the schematic diagram of limit LED backlight structure on the left of c, and d is the schematic diagram of right edge LED backlight structure;

Fig. 2 is that bilateral side entering type panel divides Division schematic diagram; Wherein, a is the schematic diagram of upper and lower side LED backlight structure, and b is the schematic diagram of left and right side LED backlight structure;

Fig. 3 is that four limit side entering type panels divide Division schematic diagram;

Fig. 4 is operation logic figure of the present invention;

Fig. 5 is four step light block diagram of the present invention;

Fig. 6 is the schematic diagram of the 4th step in the present invention four step light;

Fig. 7 be side entering-type LED backlight source of the present invention liquid crystal display dynamic light adjustment method implement device;

Fig. 8 is the first implement device figure that iteration rises brightness module;

Fig. 9 is the second implement device figure that iteration rises brightness module;

Figure 10 is the picture that embodiment 1 adopts;

Figure 11 is that embodiment 1 does not adjust light display image;

Figure 12 is embodiment 1 final backlight after four step light process;

Figure 13 shows image after embodiment 1 light modulation;

Figure 14 is the former figure that embodiment 2 adopts;

Figure 15 is that embodiment 2 does not adjust light display image;

Figure 16 is embodiment 2 final backlight after four step light process;

Figure 17 shows image after embodiment 2 light modulation.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

One, see Fig. 1-6, side entering-type LED backlight source of the present invention liquid crystal display dynamic light adjustment method comprises the following steps:

(1) with reference to Fig. 1-3, according to locations of structures and the spread condition of backlight in panel of side entering-type LED backlight lamp group, panel is divided into m × n rectangle logical partition, concrete division methods is as follows:

Side entering-type LED backlight lamp group generally comprises monolateral side entering type structure, bilateral side entering type structure and four limit side entering type structures;

1, for monolateral side entering-type LED backlight source (see Fig. 1):

If settled n group LED(structure 101 to be as shown in Figure 1a the schematic diagram of upper side edge LED backlight structure at upper side edge or lower side, structure 102 shown in Fig. 1 b is the schematic diagram of lower side LED backlight structure), then panel is divided into m × n rectangle logical partition, wherein, it is as far as possible even that m value meets backlight illumination in rectangle logical partition, in rectangle logical partition, backlight illumination change is no more than L, and 0≤L≤100cd/m ²; If settled m group LED(structure 103 to be as shown in Figure 1 the schematic diagram of limit, left side LED backlight structure on limit, left side or right edge, structure 104 is the schematic diagram of right edge LED backlight structure) then panel is divided into m × n rectangle logical partition, wherein, n value meets the backlight illumination of rectangle logical partition as far as possible evenly, the backlight illumination change of rectangle logical partition is no more than L, and 0≤L≤100cd/m ².

2, for bilateral side entering-type LED backlight source (see Fig. 2):

If settled n group LED(structure 105 to be as shown in Figure 2 a the schematic diagram of upper and lower side LED backlight structure at upper and lower double side), then panel is divided into m × n rectangle logical partition, wherein, m value meets rectangle logical partition backlight illumination as far as possible evenly, the backlight illumination change of rectangle logical partition is no more than L, and 0≤L≤100cd/m ²; If settled m group LED(structure 106 to be as shown in Figure 2 b the schematic diagram of left and right side LED backlight structure at left and right double side), then panel is divided into m × n rectangle logical partition, wherein, n value meets rectangle logical partition backlight illumination as far as possible evenly, the backlight illumination change of rectangle logical partition is no more than L, and 0≤L≤100cd/m ².

3, for four limit side entering type LED backlight (structure 107 as shown in Figure 3), if settled m group LED at left and right side, upper and lower side has settled n group LED, then panel is divided into m × n subregion.

After panel being divided into m × n rectangle logical partition, according to the size of diffusion ratio, by each logical partition ownership extremely to the LED backlight group that its diffusion ratio is maximum, namely the light intensity attenuation when light that each LED backlight group sends diffuses to affiliated logical partition is minimum, many group LED backlight groups are had to be all maximum to its diffusion ratio if there is certain rectangle logical partition, can optional one group as LED backlight group belonging to it, diffusion ratio in the present invention is defined as the ratio of luminance brightness when light that LED backlight group sends diffuses to certain rectangle logical partition and the initial luminance brightness of this LED backlight group.

(2) see Fig. 4, the RGB image signal data of input is deposited in storer, utilize the RGB image of input to calculate the target backlight of each rectangle logical partition simultaneously; Determined the final brightness lum_forth of each LED backlight group by four step light according to the target backlight of each rectangle logical partition; The display brightness of LED backlight group is controlled by the final brightness lum_forth of each LED backlight group, utilize the final brightness lum_forth of each LED backlight group to carry out liquid crystal compensation to the rgb image data in storer, the rgb image data after compensating the most at last is sent to liquid crystal module and completes dynamic light adjustment simultaneously; Wherein, target backlight, the luminosity between namely wishing by each LED backlight group is superimposed upon the normal brightness that each rectangle logical partition realizes.

See Fig. 5, according to the target backlight of each rectangle logical partition, determined the final brightness of each LED backlight group by four step light algorithms; Four light modulation algorithm steps orders perform, and after each has walked, export the brightness of each LED backlight group to next stage.

The first step: according to the target backlight of rectangle logical partition, obtains the original intensity lum_first of each LED backlight group; According to formula below, calculate the original intensity lum_first of each LED backlight group:

$\mathrm{lum}\_\mathrm{first}=\min (\mathrm{lum}\_\max ,\max (\frac{\mathrm{Goal}\_\mathrm{bl}\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{Goal}\_\mathrm{bl}\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{Goal}\_\mathrm{bl}\left(N\right)}{{\mathrm{\&alpha;}}_N}))$

Wherein, Goal_bl (l), Goal_bl (2) ... Goal_bl (N) is the target backlight of the N number of rectangle logical partition belonging to this LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, lum_max is the high-high brightness that LED backlight group can reach.

Second step: reduce the brightness of overflowing due to brightness superposition between each LED backlight group, concrete grammar is as follows:

The original intensity lum_first of all LED backlight groups is superposed, obtain the backlight illumination of full frame each rectangle logical partition, then reduce the brightness of spilling because of backlight superposition of each LED backlight group according to following formula, obtain the second step brightness lum_second of each LED backlight group:

lum_second=max(0,lum_first-Δlum_decrease)

Wherein:

$\mathrm{\&Delta;lum}\_\mathrm{decrease}$

$=\min (\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(N\right)}{{\mathrm{\&alpha;}}_N})$

Wherein, Δ Bl_decrease (1), Δ Bl_decrease (2) ... the backlight illumination that Δ Bl_decrease (N) overflows the N number of rectangle logical partition belonging to LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition; △ lum_decrease is the backlight illumination of LED backlight group to the affiliated minimum spilling in N number of logical partition; If the backlight of this rectangle logical partition is not overflowed, then corresponding Δ Bl_decrease (i)=0,1≤i≤N.;

3rd step: the brightness progressively being increased LED backlight group deficiency by process of iteration, obtains the 3rd step brightness lum_third of LED backlight group; Concrete, this step needs successive iteration, iterations is M 1≤M≤100), for iteration each time, first superposition calculation goes out the backlight illumination of each rectangle logical partition, then according to formula below, first calculates each rectangle logical partition with target backlight photo than not enough brightness, increase the brightness of each LED backlight group deficiency again, finally obtain the 3rd step brightness lum_third of each LED backlight group.

lum_third _j=min(lum_max,lum_third _j-1+k _j·Δlum_increase _j)

Wherein:

$\mathrm{\&Delta;lum}\_{\mathrm{increase}}_j$

$=\max (\frac{\mathrm{\&Delta;Bl}\_\mathrm{increas}{e}_j\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{\&Delta;Bl}\_\mathrm{increas}{e}_j\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{\&Delta;Bl}\_\mathrm{increas}{e}_j\left(N\right)}{{\mathrm{\&alpha;}}_N})$

Wherein, Δ Bl_increase _j(1), Δ Bl_increase _j(2) ... Δ Bl_increase _j(N) for N number of rectangle logical partition belonging to LED backlight group in jth time iteration is relative to the not enough backlight illumination of target backlight, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated logical partition, Δ lum_increase _jn number of rectangle logical partition belonging to LED backlight group relative to the minimum not enough backlight illumination of target backlight, k _jbacklight amplification scale-up factor during iteration secondary to jth, 0 < k _j≤ 1,1≤j≤M, and 0 < k ₁≤ k ₂≤ ... ≤ k _m≤ 1, lum_third ₀=lum_second, lum_third=lum_third _m.If rectangle logical partition backlight illumination meets or exceeds target backlight, then its Δ Bl_increase _j(i)=0,1≤1≤N.

4) the 3rd step brightness lum_third of all LED backlight groups is superposed, obtain the backlight illumination of each rectangle logical partition, if LED backlight group corresponding to this rectangle logical partition reaches high-high brightness, and backlight is still discontented with the rectangle logical partition of foot-eye backlight, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding, compensate the backlight illumination 304 of this rectangle logical partition deficiency, obtain the final brightness lum_forth of each LED backlight group.

Concrete, with reference to Fig. 6, as shown in the first module 401, the 3rd step brightness lum_third of all LED backlight groups is superposed, obtains the backlight of each rectangle logical partition, the backlight of each rectangle logical partition and target backlight through and subtracting calculating, calculate the backlight of rectangle logical partition deficiency, as shown in the second module 402 and the 3rd module 403, for each rectangle logical partition, according to the size order of diffusion ratio, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding successively, until the backlight illumination of this rectangle logical partition reaches the requirement of target backlight, , the LED backlight group calculating all rectangle logical partition non-corresponding needs the brightness increased, when plural rectangle logical partition increases the brightness of same LED backlight group simultaneously, by the maximal value of this LED backlight group brightness after increase stored in one dimension matrix lum_plus, execute after the first module 401 and the second module 402 until all subregions, lum_plus and the lum_third obtained is added in the 3rd module 403, obtain final LED backlight group brightness lum_forth, ensure can not more than lum_max simultaneously, shown in following formula:

lum_forth=min(lum_max,lum_third+lum_plus)

In addition, can also by adjusting the 3rd step light time iterations and iteration time backlight amplification scale-up factor regulate LED backlight group brightness lum_forth, to better controlling LED backlight group.

Two, with reference to Fig. 2, the device of side entering-type LED backlight source of the present invention liquid crystal display dynamic light adjustment algorithm, this device comprises image input module 201, memory module 202, calculates target backlight module 203, four step light algoritic module 204 and liquid crystal compensation module 206;

Image input module 201 is for providing the rgb image data of input and rgb image data being sent to memory module 202 and calculate target backlight module 203;

Memory module 202 is for storing rgb image data and rgb image data being supplied to liquid crystal compensation module 206;

Calculate target backlight module 203 for calculating target backlight and target backlight being supplied to four step light algoritic modules 204;

The final brightness of each LED backlight group, for determining the final brightness of each LED backlight group, sends to backlight drive module 205 to control the display brightness of LED backlight group by four step light algoritic modules 204 simultaneously;

Liquid crystal compensation module 206 is for carrying out liquid crystal compensation according to the final brightness of each LED backlight group to rgb image data, and the view data after compensating the most at last is sent to liquid crystal module to control the display of liquid crystal module.

Wherein, described four step light algoritic module 204(are see Fig. 7) comprise original intensity module 501, fall brightness module 503, fall brightness control module 502, iteration rises brightness module 504, rise surrounding brightness module 506, rises surrounding brightness control module 505, target backlight RAM module 507 and diffusion ratio ROM module 508.

The functional module of four steps (original intensity module 501, fall brightness module 503, iteration rises brightness module 504 and rise surrounding brightness control module 506) order performs, original intensity module 501 receives the target backlight of each rectangle logical partition to calculate the original intensity lum_first of each LED backlight group, after end of run, to the original intensity lum_first falling brightness module 503 and send each LED backlight group, meanwhile, to the settling signal falling brightness control module 502 and send original intensity module.

Fall after brightness control module 502 receives the settling signal of original intensity module, fall brightness control module 502 and fall brightness module 503 by control signal startup, the second brightness lum_second that brightness module 503 calculates each LED backlight group falls, after end of run, rise brightness module 504 to iteration and send lum_second, meanwhile, rise brightness module 504 and send to falling brightness control module 502 and iteration the settling signal falling brightness module.

After receiving the settling signal falling brightness module, fall brightness control module 502 and fall brightness module 503 by control signal closedown, after receiving the settling signal falling brightness module, iteration rises brightness module 504 and brings into operation, after operation completes, to the 3rd brightness lum_third rising surrounding brightness module 506 and send each LED backlight group, meanwhile, send to rising surrounding brightness control module 505 settling signal that iteration rises brightness module, rise surrounding brightness module 506 principle of work identical with falling brightness module 503, rise surrounding brightness control module 505 to receive the settling signal that iteration rises brightness module and rise surrounding brightness module 506 by control signal startup, rise surrounding brightness module 506 to bring into operation, calculate the final brightness lum_forth of each LED backlight group, after end of run, the settling signal rising surrounding brightness module is sent to and rises surrounding brightness control module 505, then control to rise surrounding brightness module 506 to close, rise the final brightness lum_forth that surrounding brightness module 506 exports each LED backlight group.

In addition, target backlight RAM module 507 for receiving target backlight, and target backlight is supplied to brightness module 503 falls, iteration rises brightness module 504 and rise surrounding brightness module 506; Diffusion ratio ROM module 508 provides diffusion ratio to falling brightness module 503, iteration rises brightness module 504 and rising surrounding brightness module 506;

Iteration of the present invention rises the first implement device of brightness module 504 as shown in Figure 8, is raised the brightness of LED backlight group by iteration, and iterations is M, 1≤M≤100.Realized by the method for cascade, to Fig. 7 fall startup that brightness control module 502 controls to fall brightness module 503 with close similar.

Iteration rises brightness module 504 and comprises M group and form submodule by iteration submodule and iteration control module;

Iteration submodule receives the 3rd step brightness of the 3rd step brightness of each LED backlight group that a upper iteration submodule calculates each LED backlight group to the calculating of next iteration submodule transmission current iteration submodule, the settling signal of current iteration submodule is also sent to current iteration control module and next step iteration control module by current sub-block simultaneously, in addition, each iteration submodule is also for receiving the diffusion ratio of target backlight from target backlight RAM module 507 and diffusion ratio ROM module 508; Each iteration control module controls startup and the stopping of current sub-block according to the settling signal of the settling signal of a upper iteration submodule and current iteration submodule.

Concrete, the first iteration control module 601 controls the first iteration submodule 602, and secondary iteration control module 603 controls secondary iteration submodule 604 ..., M iteration control module 605 controls M iteration submodule 606; After modules order is complete, export the 3rd brightness lum_third of each LED backlight group _j(1≤j≤M) and settling signal, such as: the first iteration submodule 602 exports lum_third ₁(lum_1 namely in Fig. 8), secondary iteration submodule 604 exports lum_third ₂(lum_2 namely in Fig. 8), the like.Wherein, the settling signal of the first iteration control module 601 comes from and falls brightness module 503, and the first iteration submodule 602 receives the second brightness of each LED backlight group.

Iteration of the present invention rises the second implement device of brightness module 504 as shown in Figure 9: raise the brightness of LED backlight group by iteration, and iterations is M, 1≤M≤100.Realize by feeding back, iteration rises brightness module 504 and is made up of an iteration submodule 702 and an iteration control module 701.

Second brightness lum_second of iteration submodule 702 receiving target backlight, diffusion ratio and each LED backlight group, sends iteration settling signal and iterative feedback brightness to iteration control module 701;

The reception before starting iteration of iteration control module falls the settling signal of brightness module 503 to control the startup of iteration submodule 702; After having carried out first time iteration, iteration control module 701 sends iteration settling signal and iterative feedback brightness, iteration control module 701 restarts iteration submodule 702 according to iteration settling signal, feedback brightness is inputed to iteration submodule 702 by Simultaneous Iteration control module 701, circulation feedback like this, until iteration submodule 702 runs M time, after end of run, export lum_third and settling signal to next stage.

Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.

The experiment porch of embodiment 1-2 is left and right side entering type LED backlight, and each 8 groups of LED backlight groups of left and right side, are divided into 8 × 16 logical partitions by panel, and the iterations adopted when obtaining the 3rd step brightness lum_third is 4 times, backlight amplification scale-up factor

Embodiment 1:

For the picture shown in Figure 10, Figure 11 is the picture of non-light modulation display, after four step light, obtain the brightness of 16 groups of final LED backlight groups, be respectively 53,61,15,15,240,226,189,193,185,196,255,204,118,58,95,93, lower power consumption is to 53.82% during non-light modulation, and final backlight as shown in figure 12, shows image as shown in figure 13 after light modulation.

Embodiment 2:

For the picture shown in Figure 14, center and the lower left corner are the contrast test points of mark, do not have in actual picture, the ratio of test point brightness and lower left corner test point brightness centered by contrast, Figure 15 does not adjust light display image, after four step light, obtains the brightness of 16 groups of final LED backlight groups, be respectively 0,0,57,84,255,255,230,239,227,245,255,255,43,78,0,0, lower power consumption is to 54.49% during non-light modulation; Final backlight as shown in figure 16, shows image as shown in figure 17 after light modulation.Be 1115:1 during the non-light modulation of contrast, after four step light, be increased to 24000:1.

As can be seen from above two embodiments, the light-dimming method of proposition effectively can reduce backlight power consumption, and improves picture contrast, thus strengthens image quality.

In sum, a kind of side entering-type LED backlight source liquid crystal display dynamic light adjustment algorithm that the present invention proposes and device, fully take into account uneven diffusion and the superposition mutually of backlight, utilize backlight substantially, effectively can reduce backlight power consumption, strengthen image quality, obtain the brightness of each LED backlight group, four light modulation steps are simple and easy to realize, for different side entrance back type, implementation algorithm can be carried out, highly versatile by dividing logical partition neatly.

Claims (4)

1. a side entering-type LED backlight source liquid crystal display dynamic light adjustment method, is characterized in that, comprise the following steps:

1) panel is divided into m × n rectangle logical partition; Then each rectangle logical partition is belonged to extremely maximum to its diffusion ratio LED backlight group; Wherein, the ratio of luminance brightness when diffusion ratio refers to that light that LED backlight group sends diffuses to rectangle logical partition and the initial luminance brightness of this LED backlight group; Panel is divided into several rectangle logical partitions to carry out as follows:

Side entering-type LED backlight lamp group structure comprises monolateral side entering type structure, bilateral side entering type structure and four limit side entering type structures;

1.1) for monolateral side entering-type LED backlight source:

If settled n group LED at upper side edge or lower side, then panel is divided into m × n rectangle logical partition, wherein, m value meets the backlight illumination change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²; If settled m group LED backlight group on limit, left side or right edge, then panel is divided into m × n rectangle logical partition, wherein, n value meets the backlight illumination change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²;

1.2) for bilateral side entering-type LED backlight source:

If settled n group LED backlight group at upper and lower double side, then panel is divided into m × n rectangular sub-area, wherein, the backlight illumination change that m value meets rectangle logical partition is no more than L, and 0≤L≤100cd/m ²; If settled m group LED backlight group at left and right double side, then panel is divided into m × n rectangular sub-area, wherein, n value meets the brightness change of rectangle logical partition and is no more than L, and 0≤L≤100cd/m ²;

1.3) for four limit side entering type LED backlight:

If settled m group LED at left and right side, upper and lower side has settled n group LED, then panel is divided into m × n rectangle logical partition;

2) view data of input is deposited in storer, utilize the image of input to calculate the target backlight of each rectangle logical partition simultaneously;

3) according to the target backlight of each rectangle logical partition, the final brightness of each LED backlight group is determined by following four step light;

3.1) according to the target backlight of rectangle logical partition, the original intensity lum_first of each LED backlight group is obtained; Concrete grammar is as follows:

$\mathrm{lum}\_\mathrm{first}=\min (\mathrm{lum}\_\max ,\max (\frac{\mathrm{Goal}\_\mathrm{bl}\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{Goal}\_\mathrm{bl}\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{Goal}\_\mathrm{bl}\left(N\right)}{{\mathrm{\&alpha;}}_N}))$

Wherein, Goal_bl (1), Goal_bl (2) ... Goal_bl (N) is the target backlight of the N number of rectangle logical partition belonging to this LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, lum_max is the high-high brightness that LED backlight group can reach;

3.2) superposition is carried out according to the original intensity lum_first of all LED backlight groups, obtain the backlight illumination of full frame each rectangle logical partition, then reduce the brightness that each LED backlight group is overflowed, obtain the second step brightness lum_second of each LED backlight group; Concrete grammar is as follows:

lum_second＝max(0，lum_first-Δlum_decrease)

Wherein:

$\begin{array}{c}\mathrm{\&Delta;lum}\_\mathrm{decrease}\\ =\max (\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{\&Delta;Bl}\_\mathrm{decrease}\left(N\right)}{{\mathrm{\&alpha;}}_N})\end{array}$

Δ Bl_decrease (1), Δ Bl_decrease (2) ... the backlight illumination that Δ Bl_decrease (N) overflows the N number of rectangle logical partition belonging to LED backlight group, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, the backlight illumination of the N number of rectangle logical partition minimum spilling of Δ lum_decrease belonging to LED backlight group; If the backlight of rectangle logical partition is not overflowed, then corresponding Δ Bl_decrease (i)=0,1≤i≤N;

3.3) increased the brightness of LED backlight group deficiency by process of iteration, obtain the 3rd step brightness lum_third of LED backlight group; For iteration each time, first superposition calculation goes out the backlight illumination of each rectangle logical partition, then calculate each rectangle logical partition with target backlight photo than not enough brightness, then increase the brightness of LED backlight group deficiency, finally obtain the 3rd step brightness Δ lum_third of each LED backlight group; Concrete grammar is as follows:

lum_third _j＝min(lum_max，lum_third _j-1+k _j·Δlum_increase _j)

Wherein:

$\begin{array}{c}\mathrm{\&Delta;lum}\_{\mathrm{increase}}_j\\ =\max (\frac{\mathrm{\&Delta;Bl}\_{\mathrm{increase}}_j\left(1\right)}{{\mathrm{\&alpha;}}_1},\frac{\mathrm{\&Delta;Bl}\_{\mathrm{increase}}_j\left(2\right)}{{\mathrm{\&alpha;}}_2}\&CenterDot;\&CenterDot;\&CenterDot;\frac{\mathrm{\&Delta;Bl}\_{\mathrm{increase}}_j\left(N\right)}{{\mathrm{\&alpha;}}_N})\end{array}$

Δ Bl_increase _j(1), Δ Bl_increase _j(2) ... Δ Bl_increase _j(N) for N number of rectangle logical partition belonging to LED backlight group in jth time iteration is relative to the not enough backlight illumination of target backlight, α ₁, α ₂α _nfor this LED backlight group is to the diffusion ratio of affiliated N number of rectangle logical partition, Δ lum_increase _jn number of rectangle logical partition belonging to LED backlight group is relative to the minimum not enough backlight illumination of target backlight; k _jbacklight amplification scale-up factor during iteration secondary to jth, M is iterations, and 1≤M≤100,1≤j≤M, k _jmeet 0 < k ₁≤ k ₂≤ ... ≤ k _m≤ 1; Lum_third ₀=lum_second, lum_third=lum_third _m;

3.4) carry out superposition according to the 3rd step brightness lum_third of all LED backlight groups, obtain the backlight illumination of each rectangle logical partition; Then the backlight illumination of each rectangle logical partition and target backlight through and subtracting calculating, calculate the backlight of each rectangle logical partition deficiency, if LED backlight group corresponding to rectangle logical partition reaches high-high brightness, and the backlight illumination of this rectangle logical partition still discontented foot-eye backlight, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding, compensate the backlight illumination of this rectangle logical partition deficiency, obtain the final brightness lum_forth of each LED backlight group;

Concrete grammar is as follows:

For each rectangle logical partition, according to the size order of diffusion ratio, increase the brightness with the LED backlight group of this rectangle logical partition non-corresponding successively, until the backlight illumination of this rectangle logical partition reaches the requirement of target backlight; The LED backlight group calculating all rectangle logical partition non-corresponding needs the brightness increased, when plural rectangle logical partition increases the brightness of same LED backlight group, by the maximal value of this LED backlight group brightness of increase stored in one dimension matrix lum_plus, finally lum_plus and lum_third is added, obtain the final brightness lum_forth of LED backlight group, the final brightness lum_forth of LED backlight group is no more than lum_max simultaneously, is shown below:

lum_forth＝min(lum_max，lum_third+lum_plus)；

4) the final brightness lum_forth of each LED backlight group determined by four step light controls the display brightness of LED backlight group, utilize the final brightness lum_forth of each LED backlight group to carry out liquid crystal compensation to the view data in storer simultaneously, and utilize the control of the view data after compensating liquid crystal module to complete dynamic light adjustment.

2. realize a device for side entering-type LED backlight source as claimed in claim 1 liquid crystal display dynamic light adjustment method, it is characterized in that: comprise image input module (201), memory module (202), calculate target backlight module (203), four step light algoritic modules (204) and liquid crystal compensation module (206);

Image input module (201) is for providing the view data of input and view data being sent to memory module (202) and calculate target backlight module (203);

Memory module (202) is for storing view data and view data being supplied to liquid crystal compensation module (206);

Calculate target backlight module (203) for calculating target backlight and target backlight being supplied to four step light algoritic modules (204);

Four step light algoritic modules (204), for determining the final brightness lum_forth of each LED backlight group, utilize the final brightness lum_forth of each LED backlight group to control the display brightness of LED backlight group simultaneously;

Liquid crystal compensation module (206) is for carrying out liquid crystal compensation according to the final brightness of each LED backlight group to view data, and the view data after compensating the most at last is sent to liquid crystal module and completes dynamic light adjustment;

Wherein, described four step light algoritic modules (204) comprise original intensity module (501), fall brightness module (503), fall brightness control module (502), iteration rises brightness module (504), rise surrounding brightness module (506), rise surrounding brightness control module (505), target backlight RAM module (507) and diffusion ratio ROM module (508);

Original intensity module (501) receives the target backlight of each rectangle logical partition to calculate the original intensity lum_first of each LED backlight group, and to falling brightness module (503) and send the original intensity lum_first of each LED backlight group, simultaneously to the settling signal falling brightness control module (502) and send original intensity module;

Target backlight RAM module (507) provides target backlight to falling brightness module (503), iteration rises brightness module (504) and rising surrounding brightness module (506);

Diffusion ratio ROM module (508) provides diffusion ratio to falling brightness module (503), iteration rises brightness module (504) and rising surrounding brightness module (506);

Fall brightness module (503) calculate the second step brightness lum_second of each LED backlight group and send to iteration to rise brightness module (504) and rise brightness module (504) and send to falling brightness control module (502) and iteration the settling signal falling brightness module, the settling signal falling brightness module (503) starts iteration and rises brightness module (504);

Fall brightness control module (502) fall brightness module (503) according to the settling signal startup of original intensity module (501) and fall brightness module (503) according to the settling signal closedown of falling brightness module;

Iteration rises brightness module (504) and calculates the 3rd step brightness lum_third of each LED backlight group and send to and rise surrounding brightness module (506), and the settling signal simultaneously iteration being risen brightness module sends to and rises surrounding brightness control module (505);

Rise surrounding brightness module (506) calculate and export the final brightness lum_forth of each LED backlight group, the settling signal rising surrounding brightness module is sent to simultaneously and rise surrounding brightness control module (505);

The settling signal unlatching that liter surrounding brightness control module (505) rises brightness module according to iteration rises surrounding brightness module (506) and rises surrounding brightness module (506) according to the settling signal closedown rising surrounding brightness module.

3. the device realizing side entering-type LED backlight source liquid crystal display dynamic light adjustment method according to claim 2, it is characterized in that: it is adopt the mode of cascade to realize that described iteration rises brightness module (504), iteration rises brightness module (504) and comprises M group and form submodule by iteration submodule and iteration control module; Each iteration submodule receives from the target backlight of target backlight RAM module (507) and the diffusion ratio of diffusion ratio ROM module;

Iteration submodule receives the 3rd step brightness of the 3rd step brightness of each LED backlight group that a upper iteration submodule calculates each LED backlight group to the calculating of next iteration submodule transmission current iteration submodule, and the settling signal of current iteration submodule is also sent to current iteration control module and next step iteration control module by current sub-block simultaneously;

Each iteration control module controls startup and the stopping of current sub-block according to the settling signal of the settling signal of a upper iteration submodule and current iteration submodule.

4. the device realizing side entering-type LED backlight source liquid crystal display dynamic light adjustment method according to claim 2, is characterized in that: described iteration rises that brightness module (504) realized by circulation feedback system; Iteration rises brightness module (504) and is made up of an iteration submodule (702) and an iteration control module (701),

The second step brightness lum_second of iteration submodule (702) receiving target backlight, diffusion ratio and each LED backlight group, sends iteration settling signal and iterative feedback brightness to iteration control module (701);

The reception before starting iteration of iteration control module falls the settling signal of brightness module (503) to control the startup of iteration submodule (702), after having carried out first time iteration, iteration control module (701) starts iteration submodule (702) again according to iteration settling signal, feedback brightness is inputed to iteration submodule (702) by Simultaneous Iteration control module (701), circulation feedback like this, until iteration submodule runs M time, after end of run, iteration submodule (702) exports the 3rd brightness lum_third of each LED backlight group to rising surrounding brightness module (506), iteration submodule (702) exports to rising surrounding brightness control module (505) settling signal that iteration rises brightness module.