CN101354875B

CN101354875B - LED backlight drive method for liquid crystal

Info

Publication number: CN101354875B
Application number: CN2008101509780A
Authority: CN
Inventors: 姜凤山
Original assignee: Irico Group Corp
Current assignee: Irico Group Corp
Priority date: 2008-09-16
Filing date: 2008-09-16
Publication date: 2010-09-08
Anticipated expiration: 2028-09-16
Also published as: CN101354875A

Abstract

The invention relates to an LCD driving method taking an LED as a backlight module, in particular to an LED backlight driving method for liquid crystal. The method is characterized by comprising the following steps of dividing a whole LCD panel into at least nine sections which are the same in shape and area, firstly, making brightness statistics for each section, then diffusing obtained original brightness values of input signals of a section to an adjacent sections at a proportion less than one but more than zero, and after the processing of line by line and section by section, the picture processing of the whole LCD panel is completed; and making a unitary processing to the brightness to realize the control on corresponding brightness of the LED backlight through the control on the brightness of the LED by a drive IC chip. Obviously, when the LED backlight module displays, the brightness transition is smoother under the condition that only a few bright spots are displayed, so as to effectively reduce or eliminate the original water wave phenomenon when a few bright spots are displayed.

Description

A kind of liquid crystal LED-backlit driving method

Technical field

The present invention relates to the method for driving liquid crystal display of a kind of LED of employing, especially a kind of liquid crystal LED-backlit driving method as backlight source module.

Background technology

Present stage, liquid crystal indicator has been widely used in the individual consumer's goods such as notebook computer, computer monitor, TV because in light weight, advantages such as volume is little, little power consumption, radiation is low, quality is good are arranged.Because LCD panel itself does not have the characteristics of luminescence, therefore must on the LCD panel, add a light emitting source, can reach display effect, backlight source module promptly provides the optical module of LCD display back light.

The LCD backlight source module can use light emitting diode (LED), cold-cathode fluorescence lamp (CCFL), external electrode fluorescent lamp (EFFL) etc. as light source.The backlight of giant-screen LCD main flow remains CCFL on the market, but along with development of semiconductor, the particularly appearance of high-power LED chip, LED brightness and efficient have had significant raising, make the LED-backlit source more and more be applied to LCD backlight in.Utilizing led light source is that panel backlight has a lot of advantages as LCD panel backlight than with common CCFL.Wherein the most tangible improvement is the expansion of colour gamut.Use LED-backlit to have broader colour gamut, realize more gorgeous color.But also can realize dynamically controlling the RGB mixed light, and between 9600K and 6500K, adjust white balance, and can sacrificing luminance and contrast.

Summary of the invention

The present invention proposes a kind of liquid crystal LED-backlit driving method, the brightness of part subregion can be spread (stack) on adjacent sectors by carrying out the brightness diffusion, LED-backlit source module is when showing like this, just can be when only showing the minority bright spot, luminance transition is more level and smooth, the water ripple phenomenon that reduces or occur when thoroughly eliminating original demonstration minority bright spot.

For achieving the above object, the technical solution used in the present invention is:

A kind of liquid crystal LED-backlit driving method, its special feature is, comprise the steps: whole liquid crystal display is divided into shape at least 9 subregions identical with area, at first each subregion is carried out brightness statistics, the original brightness value of the input signal of the subregion that successively statistics is obtained then, in one less than 1 but be diffused on the adjacent sectors greater than 0 ratio, by the processing of subregion, can finish processing through line by line to whole liquid crystal display epigraph; Again normalized is carried out in brightness,, realize the brightness of the corresponding LED-backlit of control by the brilliance control of driving IC chip to the LED lamp.

Wherein adjacent sectors is meant upper and lower, left and four right-hand primary partitions of a subregion.

Wherein adjacent sectors is meant upper and lower a, left side and four right-hand primary partitions of a subregion, adds upper left, lower-left, upper right and bottom-right four extended partitions again.

When the part adjacent sectors of a subregion does not exist, do not exist the data of subregion to be rejected at this.

Diffusion wherein is meant irregular diffusion, this moment each adjacent sectors the diffusion ratio be separately one less than 1 but greater than 0 value.

Diffusion wherein is meant rule diffusion, and this moment, the diffusion of each adjacent sectors was in equal proportions, and is same less than 1 but greater than 0 value.

Diffusion wherein is meant and mixes diffusion, the diffusion of four primary partitions is in equal proportions in the adjacent sectors at this moment, be same less than 1 but greater than 0 value, and the diffusion of four extended partitions is in equal proportions in the adjacent sectors, also is same less than 1 but greater than 0 value.

Clearly, LED-backlit of the present invention source module is when showing, under the situation that only shows the minority bright spot, luminance transition is more level and smooth, the water ripple phenomenon that occurs in the time of can effectively reducing or thoroughly eliminate original demonstration minority bright spot.

Description of drawings

Accompanying drawing 1 is an irregular method of diffusion legend among the embodiment 1;

Accompanying drawing 2 is to mix the method for diffusion legend among the embodiment 2.

Embodiment

The present invention is further detailed explanation below in conjunction with accompanying drawing:

The present invention proposes a kind of liquid crystal LED-backlit driving method, the brightness of part subregion can be diffused on the adjacent sectors by carrying out the brightness diffusion, thereby make the transition of brightness more level and smooth.

The inventor comprises in adjacent sectors under the condition of primary partition and extended partition with 9 subregions (being common JiuGongTu), describes entire method:

1 2 3

4 5 6

7 8 9

At first the original brightness of whole 9 subregions is added up, obtain 9 brightness values, upper left then No. 1 subregion at first begins to the right, the bottom right, 2 of below, 5,4 three subregions spread, these three subregions are adding the new brightness value after the diffusion on the basis of its original brightness value, Shang Fang No. 2 subregions begin diffusion then, do not comprise the brightness value that increases newly by its original brightness value during this No. 2 subregion diffusions, No. 2 subregions are to 1,3,4,5, No. 6 subregion diffusions, be No. 3 subregions then, and the like finish up to the diffusion of No. 9 subregions, No. 5 subregions that are in the position, bosom can be by diffusion 8 times.

Embodiment 1:

Referring to accompanying drawing 1 is a kind of irregular method of diffusion legend.

Behind whole liquid crystal display subregion, each subregion is carried out brightness statistics.The original brightness value of each subregion that will add up then is diffused on the corresponding subregion in top according to 1/16 ratio respectively; Ratio according to 3/16 is diffused on the left subregion; Ratio according to 7/16 is diffused on the right-hand subregion; Ratio according to 5/16 is diffused on the subregion of below.

Through pursuing the processing of subregion line by line, can finish processing then to the liquid crystal display entire image.And then brightness carried out normalized, by the brilliance control of driving IC chip, reach the corresponding brightness backlight of control at last to the LED lamp.

Embodiment 2:

Referring to accompanying drawing 2 are method of diffusion legends of a kind of mixing.

Behind whole liquid crystal display subregion, each subregion is carried out brightness statistics.The original brightness value of each subregion that will add up then is diffused on the corresponding subregion in upper left side according to 1/16 ratio respectively; Ratio according to 1/4 is diffused on the corresponding subregion in top; Ratio according to 1/16 is diffused on the corresponding subregion in upper right side; Ratio according to 1/4 is diffused on the corresponding subregion of left; Ratio according to 1/4 is diffused on the right-hand corresponding subregion; Ratio according to 1/16 is diffused on the corresponding subregion in lower left; Ratio according to 1/4 is diffused on the corresponding subregion in below; Ratio according to 1/16 is diffused on the corresponding subregion in lower right.

Through pursuing the processing of subregion line by line, can finish processing then to entire image.And then brightness carried out normalized, by the brilliance control of driving IC chip, reach the corresponding brightness backlight of control at last to the LED lamp.

Claims

1. a liquid crystal LED-backlit driving method is characterized in that, comprises the steps:

Whole liquid crystal display is divided into shape at least 9 subregions identical with area, at first each subregion is carried out brightness statistics, the original brightness value of the input signal of the subregion that successively statistics is obtained then, in one less than 1 but be diffused on each adjacent sectors of this subregion greater than 0 ratio, by each subregion is all carried out same DIFFUSION TREATMENT, can finish processing to whole liquid crystal display epigraph; Again normalized is carried out in brightness,, realize the brightness of the corresponding LED-backlit of control by the brilliance control of driving IC chip to the LED lamp;

Above-mentioned adjacent sectors is meant upper and lower, left and four right-hand primary partitions of a subregion;

Perhaps above-mentioned adjacent sectors is meant upper and lower a, left side and four right-hand primary partitions of a subregion, adds upper left, lower-left, upper right and bottom-right four extended partitions again.

2. a kind of liquid crystal LED-backlit driving method as claimed in claim 1 is characterized in that: when the part adjacent sectors of a subregion does not exist, do not exist the data of subregion to be rejected at this.

3. a kind of liquid crystal LED-backlit driving method as claimed in claim 1, it is characterized in that: diffusion wherein is meant irregular diffusion, this moment each adjacent sectors the diffusion ratio be separately one less than 1 but greater than 0 value.

4. a kind of liquid crystal LED-backlit driving method as claimed in claim 1 is characterized in that: diffusion wherein is meant rule diffusion, and this moment, the diffusion of each adjacent sectors was in equal proportions, and is same less than 1 but greater than 0 value.

5. a kind of liquid crystal LED-backlit driving method as claimed in claim 1, it is characterized in that: diffusion wherein is meant and mixes diffusion, the diffusion of four primary partitions is in equal proportions in the adjacent sectors at this moment, be same less than 1 but greater than 0 value, and the diffusion of four extended partitions is in equal proportions in the adjacent sectors, also is same less than 1 but greater than 0 value.