CN102411909A - Flatting method of backlight partition of direct type white light LED (Light-emitting Diode) backlight source - Google Patents
Flatting method of backlight partition of direct type white light LED (Light-emitting Diode) backlight source Download PDFInfo
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- CN102411909A CN102411909A CN2011104513012A CN201110451301A CN102411909A CN 102411909 A CN102411909 A CN 102411909A CN 2011104513012 A CN2011104513012 A CN 2011104513012A CN 201110451301 A CN201110451301 A CN 201110451301A CN 102411909 A CN102411909 A CN 102411909A
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Abstract
The invention relates to a flatting method of a backlight partition of a direct type white light LED (Light-emitting Diode) backlight source. The flatting method comprises the following steps of: (1) starting up and driving a white light LED lamp to be lightened according to a resetting value; outputting a starting-up brightness by an LED array; and meanwhile, detecting an environmental brightness by a detection unit of a photosensitive sensor and sending detection data to a control unit; (2) reading a video signal of a video decoding panel by a control device of a control unit and decoding corresponding RGB (Red Green Blue) three-colored data and resolution ratio values from the signal codes by the control device; and caching the video signal; and (3) counting gray values of the data of each pixel point in the video signal by the control device, wherein the calculated brightness value is the brightness value of the current pixel. The invention provides the flatting method of the backlight partition of the direct type white light LED backlight source to fuzzify the boundary of each partition, so that the problem that the interregional partition is jumpy is solved.
Description
Technical field
The present invention relates to a kind of direct type white light LED backlight source backlight subarea smoothing method.
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 LCD liquid crystal display of main flow has used the LED lamp as backlight on a large scale on the market, but layout backlight is main with side-light type.The LED lamp number that the advantage of side-light type is to use is few, and the TV size is thin, and is low but shortcoming is brightness, and LGP is made complicated.The advantage of the straight-down negative layout of comparing is that brightness is high, and optical texture is simple, but owing to direct-light-type backlight is that the subregion driving is lighted, will certainly appear at the phenomenon that occurs jump backlight when striding subregion.
Summary of the invention
The purpose of this invention is to provide a kind of direct type white light LED backlight source backlight subarea smoothing method, the phenomenon that can avoid trans-regional subregion to jump.
A kind of direct type white light LED backlight source backlight subarea smoothing method, its special feature is, comprises the steps:
(1) start is lighted according to reset values driving white LED lamp, makes led array output start brightness, and light sensor detection ambient brightness will detect data and send to control module simultaneously;
(2) control device of control module reads the vision signal of video decode plate, and control device solves the data and the resolution value of corresponding RGB three looks from signal encoding, and vision signal is carried out buffer memory;
(3) control device is added up according to carrying out gray-scale value each pixel number in the vision signal; The brightness value that is calculated is the brightness value of current pixel; The formula of institute's foundation is: Bright=0.288*R+0.600*G+0.120*B, and wherein Bright is a pixel brightness value, R is the red brightness value of pixel; G is the green brightness value of pixel, and B is the blue brightness value of pixel;
(4) control device compares according to the brightness value of the zone of being divided to the same area interior pixel point, draws a maximal value as brightness value benchmark in the one's respective area;
(5) control device carries out buffer memory with the brightness value benchmark;
(6) the use template is calculated the brightness value of each subregion of liquid crystal display; The formula of being accordinged to is: R0=k0s0+k1s1+k2s2+...+k8s8; Wherein R0 by the final brightness value of calculating subregion; K0 is a template parameter to k8, and s0 is the brightness value of subregion to s8, and control device carries out buffer memory with the final brightness value of each subregion;
(7) control device will calculate good drive signal value and output in the LED chip for driving, and the driving LED lamp is lighted.
Wherein the control device of control module is FPGA.
Wherein the reset values of start is the brightness of 10%-90% in the step (1).
Subregion is according to resolution or the average subregion of size according to different liquid crystal panels in the step (6).
Vision signal described in the step (2) is not for there being the treated original RGB three chromatic number numbers of it is believed that.
The present invention proposes a kind of direct type white light LED backlight source backlight subarea smoothing method,, thereby solve the phenomenon that trans-regional subregion jumps so that obfuscation is carried out on the border of each subregion.
Description of drawings
Fig. 1 is a direct type white light LED backlight source backlight subarea smoothing method process flow diagram;
Fig. 2 is the liquid crystal display partition method, and wherein 1 representes LED lamp array, and this part mainly is the array combination of LED lamp; 2 expression LCD panels; This part is traditional LCD liquid crystal panel, 3 expression subregion scopes, and this part is the subregion example that is applied to this patent; 4 expression partition numbers, this part is the subregion example numbering that is applied to this patent;
Fig. 3 handles synoptic diagram for template;
Fig. 4 handles synoptic diagram for subregion;
The template synoptic diagram of Fig. 5 for adopting.
Embodiment
Come patent is done further detailed explanation below in conjunction with accompanying drawing:
Fig. 1 is a direct type white light LED backlight source backlight subarea smoothing method process flow diagram, has mainly described the thinking of direct type white light LED backlight source backlight subarea smoothing method.At first to go the LED lamp being driven under the prerequisite light vision signal is incorporated among the main control unit FPGA.The signal of being introduced is the 28bits LVDS signal that video signal processing unit is exported for the video decode plate.Before these methods analyst data, at first to carry out subregion according to resolution, and set up the subregion look-up table whole LCD panel.
LCD panel with 1366*768 resolution is an example; According to nine white LED lamps mode that is a drive group; The partition information look-up table with each zonule numbering, and is set up according to partition number in its zonule that to be divided into 50 resolution sizes be 137*154 with the LCD panel.Then HSYNC in the vision signal and VSYNC signal are analyzed, what judge current needs adjustment color according to the data of analyzing is which zone of LCD panel, guarantees accuracy that this area L ED lamp chip for driving is adjusted with this.The subregion example is as shown in Figure 2, comprising LED lamp array 1, LCD panel 2, subregion scope 3, partition number 4.
The formula of institute's foundation is following when doing the pixel brightness statistics:
Bright=0.288*R+0.600*G+0.120*B formula (1)
Wherein Bright is final brightness value, and R is red brightness value, and G is green brightness value, and B is blue brightness value, and 0.288,0.600,0.120 is three kinds of color-ratio coefficients of RGB.After calculating each pixel brightness value of completion respectively, select the benchmark of brightness value maximum in the one's respective area as next step algorithm computation.Select subregion brightness value and template to carry out brightness calculation according to mode shown in Figure 3, the formula of institute's foundation is following:
R0=k0s0+k1s1+k2s2+...+k8s8 formula (2)
Wherein R0 by the final brightness value of calculating subregion, k0 is a template parameter to k8, s0 is the brightness value of subregion to s8.The brightness value that to confirm each good subregion at last sends to chip for driving and lights LED-backlit.
Formula (1) wherein: rgb pixel point gray-scale value computing formula, formula (2): each subregion brightness calculation formula.
Claims (5)
1. a direct type white light LED backlight source backlight subarea smoothing method is characterized in that, comprises the steps:
(1) start is lighted according to reset values driving white LED lamp, makes led array output start brightness, and light sensor detection ambient brightness will detect data and send to control module simultaneously;
(2) control device of control module reads the vision signal of video decode plate, and control device solves the data and the resolution value of corresponding RGB three looks from signal encoding, and vision signal is carried out buffer memory;
(3) control device is added up according to carrying out gray-scale value each pixel number in the vision signal; The brightness value that is calculated is the brightness value of current pixel; The formula of institute's foundation is: Bright=0.288*R+0.600*G+0.120*B, and wherein Bright is a pixel brightness value, R is the red brightness value of pixel; G is the green brightness value of pixel, and B is the blue brightness value of pixel;
(4) control device compares according to the brightness value of the zone of being divided to the same area interior pixel point, draws a maximal value as brightness value benchmark in the one's respective area;
(5) control device carries out buffer memory with the brightness value benchmark;
(6) the use template is calculated the brightness value of each subregion of liquid crystal display; The formula of being accordinged to is: R0=k0s0+k1s1+k2s2+...+k8s8; Wherein R0 by the final brightness value of calculating subregion; K0 is a template parameter to k8, and s0 is the brightness value of subregion to s8, and control device carries out buffer memory with the final brightness value of each subregion;
(7) control device will calculate good drive signal value and output in the LED chip for driving, and the driving LED lamp is lighted.
2. a kind of direct type white light LED backlight as claimed in claim 1 source backlight subarea smoothing method, it is characterized in that: wherein the control device of control module is FPGA.
3. a kind of direct type white light LED backlight as claimed in claim 1 source backlight subarea smoothing method is characterized in that: wherein the reset values of start is the brightness of 10%-90% in the step (1).
4. a kind of direct type white light LED backlight as claimed in claim 1 source backlight subarea smoothing method is characterized in that: subregion is according to resolution or the average subregion of size according to different liquid crystal panels in the step (6).
5. a kind of direct type white light LED backlight as claimed in claim 1 source backlight subarea smoothing method is characterized in that: vision signal described in the step (2) is not for there being the treated original RGB three chromatic number numbers of it is believed that.
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| CN2011104513012A CN102411909A (en) | 2011-12-20 | 2011-12-20 | Flatting method of backlight partition of direct type white light LED (Light-emitting Diode) backlight source |
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| CN2011104513012A CN102411909A (en) | 2011-12-20 | 2011-12-20 | Flatting method of backlight partition of direct type white light LED (Light-emitting Diode) backlight source |
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| CN107085344A (en) * | 2017-05-19 | 2017-08-22 | 南京信息工程大学 | The intelligent apparatus and method of backlight in a kind of full-automatic setting imaging system |
| CN112927656A (en) * | 2021-01-28 | 2021-06-08 | 武汉海微科技有限公司 | Screen backlight control method and system based on FPGA |
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