CN104299601A - Automatic regulating method and device for backlight brightness of splicing screen and splicing screen - Google Patents
Automatic regulating method and device for backlight brightness of splicing screen and splicing screen Download PDFInfo
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Abstract
The invention relates to the field of display technologies and discloses an automatic regulating method for the backlight brightness of a splicing screen. The method comprises the steps that backlight brightness values of a plurality of display screens are detected; the backlight brightness values of the display screens are compared, and the benchmark display screen and the display screens to be regulated are set; the backlight brightness value of the benchmark display screen is subtracted from the backlight brightness values of the display screens to be regulated, so that actual brightness difference values are obtained; the actual brightness difference values are converted into pulse width modulation signal difference values, and the pulse width modulation signal difference values are subtracted from to-be-regulated pulse width modulation signal values, so that regulation pulse width modulation signal values are obtained; backlight modules of the display screens to be regulated receive and execute the corresponding regulation pulse width modulation signal values. The invention further provides an automatic regulating device for the backlight brightness of the splicing screen and the splicing screen.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of mosaic screen backlight illumination Automatic adjustment method and device, mosaic screen.
Background technology
Compact TV (compact TV popular in recent years, i.e. narrow frame TV) and PID (Public Information Display, public information display) usable range of mosaic screen is more and more wider, the splicing of mosaic screen requires also more and more higher, mosaic screen is exactly arrange (such as 2 × 2 as display unit with matrix by multiple display screen, 3 × 3, 4 × 4 and larger freely unlimited splicing) mosaic screen of a composition giant-screen, each display screen shows a part for an image, the mosaic screen of matrix arrangement both can show the larger image of area jointly, also can split screen display different images.
Mosaic screen utilizes the display screen of more than two panels to be spliced, if the brightness display effect shown under same color of the panel of this few display screen is different, then the place that connects at panel of beholder, the picture seen can be discontinuous.So panel factory is when making, the LED of same brightness and colourity must be selected to provide backlight, but due to the difference in the luminescence efficiency of LED, the making difference of liquid crystal panel and mosaic screen assembling process, the display brightness of polylith display screen still can be caused inconsistent.
Summary of the invention
(1) technical matters that will solve
The object of this invention is to provide mosaic screen backlight illumination Automatic adjustment method, to realize the automatic brightness adjustment between each display screen in mosaic screen, make the brightness between each display screen reach consistent, a kind of mosaic screen backlight illumination self-checking device and a kind of mosaic screen that mosaic screen backlight illumination self-checking device is housed are provided simultaneously.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of mosaic screen backlight illumination Automatic adjustment method, comprising the following steps:
S1: the backlight brightness values detecting multiple display screen in mosaic screen;
S2: the backlight brightness values of described multiple display screen compared, to set a benchmark display screen and at least one display screen to be regulated; The backlight brightness values that the backlight brightness values of display screen to be regulated described in each in display screen to be regulated described at least one deducts described benchmark display screen is obtained intrinsic brilliance difference corresponding to display screen to be regulated described in each;
S3: intrinsic brilliance difference corresponding for described display screen to be regulated is converted to pulse width modulating signal difference; Detect described display screen to be regulated corresponding treat tunable pulse width modulation signal value, will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference;
S4: the backlight module of multiple described display screen to be regulated receives corresponding adjustment pulse width modulating signal value, and performs.
Wherein, also comprise step S2-3: set a predetermined luminance difference, by intrinsic brilliance difference corresponding for display screen to be regulated described in each respectively compared with predetermined luminance difference, when the intrinsic brilliance difference that described display screen to be regulated is corresponding is more than or equal to predetermined luminance difference, perform step S3 and S4, the backlight illumination of this display screen to be regulated is regulated; When the intrinsic brilliance difference that described display screen to be regulated is corresponding is less than predetermined luminance difference, the backlight illumination of this display screen to be regulated is not regulated.
Wherein, described step S1 specifically comprises: the backlight brightness values detecting the critical part of described display screen and adjacent display screen.
Wherein, described step S1 specifically comprises: the brightness value detecting the multiple position of back light guide plate of described display screen, gets the mean value of the brightness value of multiple position as backlight brightness values.
Wherein, described step S2 specifically comprises: the backlight brightness values of multiple described display screen compared, and minimum for backlight brightness values display screen is set as benchmark display screen, and other display screens are set as display screen to be regulated.
The invention provides a kind of mosaic screen backlight illumination self-checking device, for regulating the backlight illumination of the display screen of multiple mosaic screen, comprising:
Multiple brightness detection module, multiple described brightness detection module is separately positioned in the inside light guide plate of multiple display screen in mosaic screen, for the backlight brightness values of detection display screen;
Brightness processed module, it connects multiple described brightness detection module, for receiving the backlight brightness values of the backlight brightness values of the multiple described display screen that described brightness detection module detects more multiple described display screen, set a benchmark display screen and at least one display screen to be regulated, and calculate the intrinsic brilliance difference of display screen to be regulated and benchmark display screen described in each;
Luminance adjustment module, it connects brightness processed module, for receiving the intrinsic brilliance difference of described display screen to be regulated and benchmark display screen, intrinsic brilliance difference corresponding for display screen to be regulated described in each is converted to pulse width modulating signal difference, calculates adjustment pulse width modulating signal value; And
Multiple display screen driver module, is separately positioned in the backlight module of multiple described display screen; Multiple described display screen driver module connects luminance adjustment module respectively, the adjustment pulse width modulating signal that the display screen to be regulated for receiving the calculating of described luminance adjustment module is corresponding.
Wherein, this device also comprises the luminance difference comparison module be connected between described brightness processed module and luminance adjustment module, predetermined luminance difference is provided with in described luminance difference comparison module, for receive that described brightness processed module calculates each described in intrinsic brilliance difference corresponding to display screen to be regulated, intrinsic brilliance difference and predetermined luminance difference are compared, and determines whether to regulate the backlight brightness values of display screen to be regulated according to the result compared.
Wherein, described brightness processed module comprises the benchmark screen setup unit and intrinsic brilliance difference computational unit that are connected; Described benchmark screen setup unit is connected with described brightness detection module respectively, for receiving the backlight brightness values that described in each, brightness detection module detects, and comparing, setting a benchmark display screen and at least one display screen to be regulated; Described intrinsic brilliance difference computational unit is for calculating the intrinsic brilliance difference described in each between display screen to be regulated and benchmark display screen.
Wherein, described luminance adjustment module comprises the pulse width modulating signal converting unit and pulse width modulating signal computing unit that are connected; Described pulse width modulating signal converting unit and described brightness processed model calling, for converting intrinsic brilliance difference corresponding for each display screen to be regulated to pulse width modulating signal difference; Described pulse width modulating signal computing unit is connected with described display screen driver module, for detect display screen to be regulated corresponding treat tunable pulse width modulation signal value, and will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference.
Wherein, described brightness detection module is made up of multiple luminance sensor, and most described luminance sensors is arranged on the critical localisation of the display screen of splicing.
Wherein, described brightness processed module and luminance adjustment module are programmable logic device; Described programmable logic device adopts CPLD or field programmable gate array.
Wherein, described display screen driver module is LED drive integrated circult.
Wherein, described brightness detection module, brightness processed module, luminance difference comparison module, luminance adjustment module and display screen driver module are integrated on a printed circuit board (PCB).
The present invention also provides a kind of mosaic screen, comprises multiple mosaic screen backlight illumination self-checking device, the corresponding multiple display screen respectively of mosaic screen backlight illumination self-checking device described in each; One of them is main mosaic screen backlight illumination self-checking device, other are from mosaic screen backlight illumination self-checking device, and each is connected with described main mosaic screen backlight illumination self-checking device from mosaic screen backlight illumination self-checking device respectively by communication bus; Described main mosaic screen backlight illumination self-checking device is mosaic screen backlight illumination self-checking device described above; Describedly to comprise from mosaic screen backlight illumination self-checking device:
Multiple brightness detection module, multiple described brightness detection module is separately positioned in the inside light guide plate of multiple display screen in mosaic screen, for the backlight brightness values of detection display screen;
Multiple display screen driver module, is separately positioned in the backlight module of multiple described display screen;
Described communication bus is used for the brightness processed module sent to by the described brightness data detected from the brightness detection module mosaic screen backlight illumination self-checking device in main mosaic screen backlight illumination self-checking device, after described brightness processed module and luminance adjustment module process successively, the data that the luminance adjustment module of described main mosaic screen backlight illumination self-checking device exports are sent to described from the display screen driver module mosaic screen backlight illumination self-checking device.
(3) beneficial effect
Mosaic screen backlight illumination Automatic adjustment method provided by the invention and device thereof, by detecting the backlight brightness values of each display screen in mosaic screen, backlight brightness values is compared, using a display screen as benchmark display screen, if the display screen selecting backlight brightness values minimum is as benchmark display screen, regulate the backlight brightness values of other display screens, thus make the brightness between each display screen reach consistent, control method is simple, easily realizes, and effect stability.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of mosaic screen backlight illumination Automatic adjustment method embodiment of the present invention;
Fig. 2 is mosaic screen backlight illumination self-checking device of the present invention example structure schematic diagram;
Fig. 3 is the theory diagram of the structural representation shown in Fig. 2;
Fig. 4 is the structural representation of mosaic screen embodiment of the present invention.
In figure, 1,2,3,4,5,6,7,8: display screen; 11,11-1: printed circuit board (PCB); 12: programmable logic device; 13,13-1: brightness detection module; 14,14-1:LED drive integrated circult; 20: communication bus; 30: brightness processed module; 31: benchmark screen setup unit; 32: intrinsic brilliance difference computational unit; 33: luminance difference comparison module; 40: luminance adjustment module; 41: pulse width modulating signal converting unit; 42: pulse width modulating signal computing unit.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following instance for illustration of the present invention, but is not used for limiting the scope of the invention.
With reference to shown in Fig. 1 and 2, mosaic screen backlight illumination Automatic adjustment method of the present invention, changes backlight illumination by regulating the pulse width modulating signal value of the display screen driver module of display screen.The mosaic screen that the present embodiment is spliced to regulate 4 pieces of display screens, 4 pieces of display screens are designated as display screen 1, display screen 2, display screen 3 and display screen 4.It comprises the following steps:
Step S1: the backlight brightness values detecting the inside light guide plate of each display screen in mosaic screen, the brightness value of display screen 1 is lum1, and the brightness value of display screen 2 is lum2, and the brightness value of display screen 3 is lum3, and the brightness value of display screen 4 is lum4.Because the backlight brightness values difference value between adjacent display screen affects mosaic screen display effect the most significantly, therefore, the backlight brightness values of the critical part of preferred detection display screen and adjacent display screen.During backlight brightness values as detection display screen 1, the backlight brightness values of critical part position between detection display screen 1 and display screen 2.In order to improve the accuracy that backlight brightness values regulates, the brightness value of the multiple position of back light guide plate of being shielded by detection display, gets the mean value of the brightness value of multiple position as backlight brightness values.
Step S2: the backlight brightness values of multiple display screen compared, to set a benchmark display screen and at least one display screen to be regulated; The backlight brightness values that the backlight brightness values of each display screen to be regulated at least one display screen to be regulated deducts benchmark display screen is obtained intrinsic brilliance difference B corresponding to each display screen to be regulated.In the present embodiment, be set as benchmark display screen with the display screen that backlight brightness values is minimum, other display screens are set as display screen to be regulated.The relatively brightness value of 4 display screens, suppose that the brightness value lum4 of display screen 4 is minimum, display screen 4 is set as benchmark display screen, and namely the backlight brightness values min_lum of benchmark display screen equals lum4, and other display screens 1, display screen 2, display screen 3 are all set as display screen to be regulated.The intrinsic brilliance difference B1 of display screen 1 correspondence to be regulated is obtained with the backlight brightness values min_lum that the backlight brightness values lum1 of display screen 1 deducts benchmark display screen; The intrinsic brilliance difference B2 of display screen 2 correspondence to be regulated is obtained with the backlight brightness values min_lum that the backlight brightness values lum2 of display screen 2 deducts benchmark display screen; The intrinsic brilliance difference B3 of display screen 3 correspondence to be regulated is obtained with the backlight brightness values min_lum that the backlight brightness values lum3 of display screen 3 deducts benchmark display screen.
Setting procedure S2-3 between step S2 to S3, step S2-3 is specially: set a predetermined luminance difference A, by intrinsic brilliance difference B corresponding for each display screen to be regulated respectively compared with predetermined luminance difference A, when the intrinsic brilliance difference B that display screen to be regulated is corresponding is more than or equal to predetermined luminance difference A, then step S3 and S4 is performed downwards, the backlight illumination of this display screen to be regulated is regulated, the backlight brightness values of this display screen to be regulated is met the requirements; When the intrinsic brilliance difference B that display screen to be regulated is corresponding is less than predetermined luminance difference, the backlight illumination of this display screen to be regulated is not regulated.Wherein, the size of predetermined luminance difference A can with reference to the distinguishable minimum brightness difference of human eye.Example is adjusted to display screen 1, if B1<A, then show that the backlight illumination difference between display screen 1 to be regulated and benchmark display screen can not be identified by the human eye, need not backlight illumination adjustment be carried out, namely do not jump to step S3, terminate to regulate the backlight illumination of display screen 1; If B1 >=A, then show that the backlight illumination difference between display screen 1 to be regulated and benchmark display screen can be identified by the human eye, then what need to carry out display screen 1 carries out backlight illumination adjustment, and namely redirect performs step S3, S4 successively.
Step S3: intrinsic brilliance difference B corresponding for display screen to be regulated is converted to pulse width modulating signal difference, detect display screen to be regulated corresponding treat tunable pulse width modulation signal value, will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference.For display screen 1 as display screen to be regulated, the intrinsic brilliance difference B1 of display screen 1 correspondence is converted to pulse width modulating signal difference, what detection display shielded 1 correspondence treats tunable pulse width modulation signal value, will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference.Display screen 2, display and 3 in the same way with display screen 1 simultaneously or calculate successively and obtain corresponding adjustment pulse width modulating signal value.
S4: the backlight module of multiple display screen to be regulated receives and performs corresponding adjustment pulse width modulating signal value.For display screen 1, the backlight module of display screen 1 receives corresponding adjustment pulse width modulating signal value, and perform, make the backlight brightness values of display screen 1 identical with the backlight brightness values of benchmark display screen, or make the intrinsic brilliance difference B1 between the backlight brightness values of the backlight brightness values of display screen 1 and benchmark display screen be less than predetermined luminance difference A.Now, the backlight illumination completing display screen 1 regulates.Display screen 2, display screen 3 in the same way with display screen 1 simultaneously or regulate successively.
Step S2 in above-mentioned adjustment process ~ S4 computer software programs are expressed as follows:
lum_min＝(lum1、lum2、lum3、lum4)
If(lum1-lum_min>A)
PWM1＝PWM1-C*(lum1-lum_min)
else
PWM1＝PWM1
If(lum2-lum_min>A)
PWM2＝PWM2-C*(lum2-lum_min)
else
PWM2＝PWM2
If(lum3-lum_min>A)
PWM3＝PWM3-C*(lum3-lum_min)
else
PWM3＝PWM3
In above-mentioned formula, C is the conversion coefficient of backlight brightness values and pulse width modulating signal, and this conversion coefficient can be arranged voluntarily according to user's request, and such as, when both are linear relationship, as pulse width modulating signal=backlight brightness values, then now C value is 1.As brightness and PWM be nonlinear relation time, C also can change thereupon.
In said method, in step S2, the display screen that backlight brightness values also can be used maximum is as benchmark display screen, and other display screens are as display screen to be regulated.
As shown in Figures 2 and 3, the present invention is also provided for the mosaic screen backlight illumination self-checking device of mosaic screen backlight illumination Automatic adjustment method, with reference to shown in Fig. 2, mosaic screen to be regulated in the present embodiment is rearranged in matrix by display screen 1, display screen 2, display screen 3, display screen 4.Mosaic screen backlight illumination self-checking device comprises: 4 display screen driver modules, 14,4 brightness detection modules, 13,1 brightness processed module, 30,1 luminance difference comparison module 33 and 1 luminance adjustment module 40.As shown in Figure 3, brightness processed module 30, luminance difference comparison module 33 and luminance adjustment module 40 are realized by software for editing program in a programmable logic device 12.With reference to shown in Fig. 2 and Fig. 3,4 display screen driver modules 14 are separately positioned on the backlight module of display screen 1, display screen 2, display screen 3 and display screen 4, for driving corresponding backlight module.4 display screen driver modules, 14,4 brightness detection modules, 13,1 brightness processed module, 30,1 luminance difference comparison module 33 and 1 luminance adjustment module 40 are integrated on a printed circuit board (PCB) 11.
4 brightness detection modules 13 are arranged in the inside light guide plate of display screen 1, display screen 2, display screen 3 and display screen 4, for detecting the backlight brightness values of 4 display screens.Each brightness detection module 13 is made up of multiple luminance sensor, multiple luminance sensor is separately positioned on the diverse location of back light guide plate, by measuring the brightness value of multiple position, averages as backlight brightness values.Preferably, most luminance sensors is arranged on the critical localisation of the display screen of splicing, the main brightness obtaining position near display screen and adjacent display screen.
Brightness processed module 30 connects 4 brightness detection modules 13 respectively, for receiving the backlight brightness values of display screen 1, display screen 2, display screen 3 and display screen 4 that brightness detection module detects and comparing the backlight brightness values of display screen 1, display screen 2, display screen 3 and display screen 4, set a benchmark display screen and other three display screens to be regulated, and calculate the intrinsic brilliance difference of each display screen to be regulated and benchmark display screen.Concrete, brightness processed module comprises the benchmark screen setup unit 31 and intrinsic brilliance difference computational unit 32 that are connected.Benchmark screen setup unit 31 is connected with brightness detection module 13 respectively, for receiving the backlight brightness values that each brightness detection module 13 detects, and comparing, setting a benchmark display screen and at least one display screen to be regulated.Intrinsic brilliance difference computational unit 32 is for calculating the intrinsic brilliance difference between each display screen to be regulated and benchmark display screen.
Luminance difference comparison module 33 is connected between brightness processed module 30 and luminance adjustment module 40, wherein be provided with predetermined luminance difference, the intrinsic brilliance difference that each display screen to be regulated that reception brightness processed module 30 calculates is corresponding, intrinsic brilliance difference and predetermined luminance difference are compared, and determines whether to regulate the backlight brightness values of display screen to be regulated according to the result compared.The selection of predetermined luminance difference size can with reference to the distinguishable minimum brightness difference of human eye.
Luminance adjustment module 40 connects brightness processed module 30, for receiving the intrinsic brilliance difference of display screen to be regulated and benchmark display screen, intrinsic brilliance difference corresponding for each display screen to be regulated is converted to pulse width modulating signal difference, calculates adjustment pulse width modulating signal value.4 display screen driver modules 14 connect luminance adjustment module 40 respectively, the adjustment pulse width modulating signal that the display screen to be regulated for receiving luminance adjustment module 40 calculating is corresponding.Concrete, luminance adjustment module 40 comprises the pulse width modulating signal converting unit 41 and pulse width modulating signal computing unit 42 that are connected.Pulse width modulating signal converting unit 41 is connected with brightness processed module 30, for converting intrinsic brilliance difference to pulse width modulating signal difference.Pulse width modulating signal computing unit 42 is connected with 4 display screen driver modules 14, for detect display screen to be regulated corresponding treat tunable pulse width modulation signal value, i.e. detection display screen 1, display screen 2 and display screen 3 treat tunable pulse width modulation signal value, and will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference, and adjustment pulse width modulating signal value is sent to the display screen driver module 14 of corresponding display screen to be regulated, display screen driver module 14 receives corresponding adjustment pulse width modulating signal value, drive the backlight module of display screen, control the backlight brightness values of display screen to be regulated, make display screen 1, the backlight brightness values of display screen 2 and display screen 3 meets the requirements.Pulse width modulating signal converting unit 41 respectively with intrinsic brilliance difference computational unit 32, luminance difference comparison module 33, the intrinsic brilliance difference that the display screen to be regulated that one side reception intrinsic brilliance difference computational unit 32 calculates is corresponding, one side receives the signal whether carrying out brightness regulation that luminance difference comparison module 33 sends.
The preferred CPLD of programmable logic device 12 of the present invention or field programmable gate array.
It should be noted that, brightness processed module 30 and luminance adjustment module 40 can adopt other can realize the similar components and parts of this process and regulatory function.Brightness processed module 30 and luminance adjustment module 40 also can software for editing program realizations on a programmable logic device 12 respectively.Pulse width modulating signal converting unit 41 and pulse width modulating signal computing unit 42 also can realize respectively in a programmable logic device 12.Display screen driver module in the present embodiment adopts but is not limited to adopt LED (light emitting diode) drive integrated circult.In addition, the brightness processed module in the present invention, luminance adjustment module also can be set to multiple.
A kind of mosaic screen, as shown in Figure 4, the mosaic screen of the present embodiment is carried out arrangement according to the mode of matrix spliced by display screen 1, display screen 2, display screen 3, display screen 4, display screen 5, display screen 6, display screen 7, display screen 8.This mosaic screen comprises 2 mosaic screen backlight illumination self-checking devices, 2 mosaic screen backlight illumination self-checking devices corresponding 4 display screens respectively.Concrete, in 2 mosaic screen backlight illumination self-checking devices of the present embodiment, one of them is main mosaic screen backlight illumination self-checking device 100, main mosaic screen backlight illumination self-checking device 100 to be integrated in a printed circuit board on 12, and its correspondence is arranged on the back of display screen 1, display screen 2, display screen 3, display screen 4; Another is from mosaic screen backlight illumination self-checking device 200, and be also integrated in one piece of circuit board from mosaic screen backlight illumination self-checking device 200, its correspondence is arranged on the back of display screen 5, display screen 6, display screen 7, display screen 8.Be connected with main mosaic screen backlight illumination self-checking device 100 from mosaic screen backlight illumination self-checking device 200 by communication bus 20.Main mosaic screen backlight illumination self-checking device 100 is the mosaic screen backlight illumination self-checking device described in previous embodiment; Comprise from mosaic screen backlight illumination self-checking device 200: be integrated in 4 brightness detection module 13-1 and 4 display screen driver module 14-1 one piece of circuit board 11-1.4 described brightness detection module 13-1 are separately positioned in the inside light guide plate of display screen 5 in mosaic screen, display screen 6, display screen 7, display screen 8, for the backlight brightness values of detection display screen 5, display screen 6, display screen 7, display screen 8.4 display screen driver module 14-1 are separately positioned in the backlight module of display screen 5, display screen 6, display screen 7, display screen 8.Communication bus 20 is for sending the brightness processed module 30 in main mosaic screen backlight illumination self-checking device 100 to by the brightness data detected from the brightness detection module 13-1 in mosaic screen backlight illumination self-checking device 200, after brightness processed module 30 and luminance adjustment module 40 process successively, the data exported by the luminance adjustment module 40 of main mosaic screen backlight illumination self-checking device 100 are sent to from the display screen driver module 14-1 mosaic screen backlight illumination self-checking device 200 by communication bus 20.4 brightness detection modules 13 are detected that backlight brightness values that backlight brightness values and 4 brightness detection module 13-1 detect is put together and compare by brightness processed module 30, backlight brightness values lum1, lum2, lum3, lum4, lum5, lum6, lum7, lum8 in display screen 1 to display screen 8 are compared, using minimum for backlight brightness values one as benchmark display screen, other 7 as display screen to be regulated, and calculate intrinsic brilliance difference corresponding to display screen to be regulated respectively.Calculate adjustment pulse width modulating signal value corresponding to display screen to be regulated respectively by luminance adjustment module 40, and sent to accordingly from the display screen driver module 14-1 mosaic screen backlight illumination self-checking device 200 by communication bus 20.
The rest may be inferred, when display screen increasing number in mosaic screen, can increase from the quantity from mosaic screen backlight illumination self-checking device 200, adopt a communication bus 20 to be connected respectively between mosaic screen backlight illumination self-checking device 200 with main mosaic screen backlight illumination self-checking device 100.Meanwhile, in above-described embodiment, also a printed circuit board (PCB) can be set between adjacent two pieces of display screens.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a mosaic screen backlight illumination Automatic adjustment method, is characterized in that, comprises the following steps:
S1: the backlight brightness values detecting multiple display screen in mosaic screen;
S2: the backlight brightness values of described multiple display screen compared, to set a benchmark display screen and at least one display screen to be regulated; The backlight brightness values that the backlight brightness values of display screen to be regulated described in each in display screen to be regulated described at least one deducts described benchmark display screen is obtained intrinsic brilliance difference corresponding to display screen to be regulated described in each;
S3: intrinsic brilliance difference corresponding for described display screen to be regulated is converted to pulse width modulating signal difference; Detect described display screen to be regulated corresponding treat tunable pulse width modulation signal value, will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference;
S4: the backlight module of display screen to be regulated described in each receives corresponding adjustment pulse width modulating signal value, and performs.
2. mosaic screen backlight illumination Automatic adjustment method as claimed in claim 1, it is characterized in that, also comprise step S2-3: set a predetermined luminance difference, by intrinsic brilliance difference corresponding for display screen to be regulated described in each respectively compared with predetermined luminance difference, when the intrinsic brilliance difference that described display screen to be regulated is corresponding is more than or equal to predetermined luminance difference, perform step S3 and S4, the backlight illumination of this display screen to be regulated is regulated; When the intrinsic brilliance difference that described display screen to be regulated is corresponding is less than predetermined luminance difference, the backlight illumination of this display screen to be regulated is not regulated.
3. mosaic screen backlight illumination Automatic adjustment method as claimed in claim 1, it is characterized in that, described step S1 specifically comprises: the backlight brightness values detecting the critical part of described display screen and adjacent display screen.
4. mosaic screen backlight illumination Automatic adjustment method as claimed in claim 3, it is characterized in that, described step S1 specifically comprises: the brightness value detecting the multiple position of back light guide plate of described display screen, gets the mean value of the brightness value of multiple position as backlight brightness values.
5. mosaic screen backlight illumination Automatic adjustment method as claimed in claim 1, it is characterized in that, described step S2 specifically comprises: the backlight brightness values of multiple described display screen compared, minimum for backlight brightness values display screen is set as benchmark display screen, and other display screens are set as display screen to be regulated.
6. a mosaic screen backlight illumination self-checking device, for regulating the backlight illumination of the display screen of multiple mosaic screen, is characterized in that, comprising:
Multiple brightness detection module, multiple described brightness detection module is separately positioned in the inside light guide plate of multiple display screen in mosaic screen, for the backlight brightness values of detection display screen;
Brightness processed module, it connects multiple described brightness detection module, for receiving the backlight brightness values of the backlight brightness values of the multiple described display screen that described brightness detection module detects more multiple described display screen, set a benchmark display screen and at least one display screen to be regulated, and calculate the intrinsic brilliance difference of display screen to be regulated and benchmark display screen described in each;
Luminance adjustment module, it connects brightness processed module, for receiving the intrinsic brilliance difference of described display screen to be regulated and benchmark display screen, intrinsic brilliance difference corresponding for display screen to be regulated described in each is converted to pulse width modulating signal difference, calculates adjustment pulse width modulating signal value; And
Multiple display screen driver module, is separately positioned in the backlight module of multiple described display screen; Multiple described display screen driver module connects luminance adjustment module respectively, the adjustment pulse width modulating signal that the display screen to be regulated for receiving the calculating of described luminance adjustment module is corresponding.
7. mosaic screen backlight illumination self-checking device as claimed in claim 6, it is characterized in that, this device also comprises the luminance difference comparison module be connected between described brightness processed module and luminance adjustment module, predetermined luminance difference is provided with in described luminance difference comparison module, for receive that described brightness processed module calculates each described in intrinsic brilliance difference corresponding to display screen to be regulated, intrinsic brilliance difference and predetermined luminance difference are compared, and determines whether to regulate the backlight brightness values of display screen to be regulated according to the result compared.
8. mosaic screen backlight illumination self-checking device as claimed in claim 6, is characterized in that, described brightness processed module comprises the benchmark screen setup unit and intrinsic brilliance difference computational unit that are connected; Described benchmark screen setup unit is connected with described brightness detection module respectively, for receiving the backlight brightness values that described in each, brightness detection module detects, and comparing, setting a benchmark display screen and at least one display screen to be regulated; Described intrinsic brilliance difference computational unit is for calculating the intrinsic brilliance difference described in each between display screen to be regulated and benchmark display screen.
9. mosaic screen backlight illumination self-checking device as claimed in claim 6, it is characterized in that, described luminance adjustment module comprises the pulse width modulating signal converting unit and pulse width modulating signal computing unit that are connected; Described pulse width modulating signal converting unit and described brightness processed model calling, for converting intrinsic brilliance difference corresponding for each display screen to be regulated to pulse width modulating signal difference; Described pulse width modulating signal computing unit is connected with described display screen driver module, for detect display screen to be regulated corresponding treat tunable pulse width modulation signal value, and will treat that tunable pulse width modulation signal value deducts the adjusted pulse width modulating signal value of pulse width modulating signal difference.
10. the mosaic screen backlight illumination self-checking device as described in any one of claim 6 to 9, is characterized in that, described brightness detection module is made up of multiple luminance sensor, and most described luminance sensors is arranged on the critical localisation of the display screen of splicing.
11. mosaic screen backlight illumination self-checking devices as claimed in claim 10, it is characterized in that, described brightness processed module and luminance adjustment module are programmable logic device; Described programmable logic device adopts CPLD or field programmable gate array.
12. mosaic screen backlight illumination self-checking devices as claimed in claim 11, it is characterized in that, described display screen driver module is LED drive integrated circult.
13. mosaic screen backlight illumination self-checking devices as claimed in claim 12, it is characterized in that, described brightness detection module, brightness processed module, luminance difference comparison module, luminance adjustment module and display screen driver module are integrated on a printed circuit board (PCB).
14. 1 kinds of mosaic screens, is characterized in that, comprise multiple mosaic screen backlight illumination self-checking device, the corresponding multiple display screen respectively of mosaic screen backlight illumination self-checking device described in each; One of them is main mosaic screen backlight illumination self-checking device, other are from mosaic screen backlight illumination self-checking device, and each is connected with described main mosaic screen backlight illumination self-checking device from mosaic screen backlight illumination self-checking device respectively by communication bus; Described main mosaic screen backlight illumination self-checking device is the mosaic screen backlight illumination self-checking device as described in any one of claim 6 ~ 13; Describedly to comprise from mosaic screen backlight illumination self-checking device:
Multiple brightness detection module, multiple described brightness detection module is separately positioned in the inside light guide plate of multiple display screen in mosaic screen, for the backlight brightness values of detection display screen;
Multiple display screen driver module, is separately positioned in the backlight module of multiple described display screen;
Described communication bus is used for the brightness processed module sent to by the described brightness data detected from the brightness detection module mosaic screen backlight illumination self-checking device in main mosaic screen backlight illumination self-checking device, after described brightness processed module and luminance adjustment module process successively, the data that the luminance adjustment module of described main mosaic screen backlight illumination self-checking device exports are sent to described from the display screen driver module mosaic screen backlight illumination self-checking device.
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