CN106710565A - Correction method for liquid crystal display screen array - Google Patents
Correction method for liquid crystal display screen array Download PDFInfo
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- CN106710565A CN106710565A CN201710199795.7A CN201710199795A CN106710565A CN 106710565 A CN106710565 A CN 106710565A CN 201710199795 A CN201710199795 A CN 201710199795A CN 106710565 A CN106710565 A CN 106710565A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a correction method for a liquid crystal display screen array and provides a master control module, a liquid-crystal display array and a video source, wherein the master control module is electrically connected with the liquid-crystal display screen array and the video source. The correction method comprises the following steps: step (S1), replacing a liquid-crystal display screen into the liquid-crystal display screen array; step (S2), determining the working brightness of a backlight source of the newly-replaced liquid-crystal display screen according to prestored backlight brightness-time attenuation curve, the current working time of the liquid-crystal display screen array and the current brightness of the liquid-crystal display screen array; and step (S3), adjusting the brightness of the backlight source of the newly-replaced liquid-crystal display screen to the working brightness determined in the step (2). According to the correction method, the cost of hardware equipment is saved.
Description
Technical field
The present invention relates to the correction field of LCDs, particularly a kind of bearing calibration of LCDs array.
Background technology
Liquid crystal display（English：Liquid Crystal Display, abbreviation：LCD）It is the display device of thin plane,
Its panel is made up of a number of colored or monochrome pixels, is positioned over light source or reflecting surface front.With reference to as shown in Figure 1
Liquid crystal display device structure, liquid crystal display is by Polarizer 101, the colored filter 103 of glass substrate 102, alignment film 104, liquid crystal
105th, alignment film 106, glass substrate 107, Polarizer 108, blooming piece 109, light reflection plate 110, CCFL 111,
Light guide plate 112, blooming piece 113 etc. are constituted, and its operation principle is to pass through liquid crystal surface by controlling the backlight of backlight module 122
The color of the light of plate 121 and the number of transmitted light, realize the display of image.
The occasion that large-size screen monitors show is needed at some, by splicing liquid crystal display, to obtain greater area of display effect.
Nowadays splicing liquid crystal display is widely used in the multiple fields such as government, public security, traffic.Splicing liquid crystal display is using one section
Brightness decay equally occurs after time, and, this decay is irreversible.The brightness for splicing liquid crystal display declines to some extent
Subtract the display effect and service life that can have a strong impact on LED display.Installed in Mosaic screen or liquid crystal display maintenance is replaced
During changing, if the brightness adjustment of two pieces of adjacent splicing video screens is improper, picture can be caused discontinuous, for example, gone out
Existing color is coarse or mosaic phenomenon.
《The application of the LED display gamma correction technology based on CCD》In provide a kind of correcting scheme, i.e., using height
Performance camera（To occur without moire fringes in photo）The brightness data of LCDs is gathered, then using alignment technique to adopting
The brightness data of collection is analyzed, corrects, finally corrected brightness data files passe to display screen control panel.
But existing correcting scheme apparatus expensive, connects complicated between equipment and Mosaic screen equipment.
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of bearing calibration of LCDs array, hardware has been saved and has set
Standby cost.
The present invention is realized using following scheme：A kind of bearing calibration of LCDs array a, there is provided main control module, liquid
Crystal display screen array and video source, the main control module are electrical connected with the LCDs array, video source；Including with
Lower step：
Step S1：In replacing one piece of LCDs to LCDs array；
Step S2：According to the backlight illumination for prestoring-time attenuation curve, the work at present time of LCDs array and liquid crystal
The present intensity of display screen array, it is determined that the operating brightness of the backlight of the new LCDs changed；
Step S3：The operating brightness that the brightness adjustment of the backlight of the new LCDs changed is determined to step S2.
Further, the work at present time in the step S2 is each LCDs in the LCDs array
Working time it is average.
Further, the work at present time in the step S2 be the LCDs array in the working time it is most long
That block LCDs working time.
Further, the work at present time in the step S2 is minimum that of brightness in the LCDs array
The working time of block LCDs.
Further, the backlight illumination-time attenuation curve for prestoring is the liquid crystal display measured by laboratory facilities
The curve map of relation between screen backlight illumination and cumulative operation time.
Further, the main control module drives each LCDs drive control circuit backlight and output signal,
Each LCDs drive control circuit includes driver module and memory module, and the driver module drives liquid
Crystal display screen shows optical signal, and the memory module is stored with the display parameters of LCDs.
Further, the display parameters include the working time of LCDs array, what the main control module prestored
Backlight illumination-time attenuation curve.
Further, in adjustable liquid crystal display brightness of display screen, the main control module declines according to the backlight illumination-time for prestoring
Subtract curve, the present intensity of LCDs array and the work at present time obtained from memory module, it is determined that the new liquid changed
The operating brightness of the backlight of crystal display screen；The controller notifies the driver module by the new LCDs changed
Backlight brightness adjustment to operating brightness.
Preferably, the brightness adjustment of the backlight of the new LCDs changed is specially into change backlight to operating brightness
Source driving current is so as to realize the gamma correction to the backlight.
Further, also including step：According to default time interval, to the LCDs in LCDs array
Carry out calibration one by one.
Compared with prior art, the present invention has following beneficial effect：The present invention is bent by the backlight illumination-time for prestoring
Line, extrapolates working time corresponding brightness decay percentage, therefore in the LCDs in replacing array of display, can be with
Display screen after preferably regulation is replaced, so that its brightness is adapted to LCD array well, and has saved hardware device
Cost.
Brief description of the drawings
Fig. 1 is the liquid-crystal displaying screen structure schematic diagram described in background of invention.
Fig. 2 is correction equipment frame structure schematic diagram in the embodiment of the present invention.
Fig. 3 is method flow schematic diagram in the embodiment of the present invention.
Fig. 4 be the embodiment of the present invention in different driving electric current to light decay curvature relationship schematic diagram.
Fig. 5 is the curve map of brightness and pulsewidth in the embodiment of the present invention.
[primary clustering symbol description]
In figure：101 is Polarizer；102 is glass substrate；103 is colored filter；104 is alignment film；105 is liquid crystal；106
It is alignment film；107 is glass substrate；108 is Polarizer；109 is blooming piece；110 is light reflection plate；111 is cold cathode
Fluorescent tube；112 is light guide plate；113 is blooming piece；121 is liquid crystal panel；122 is backlight module；2011 is LCDs；
2012 is LCDs；201 is LCDs array；202 is main control module；203 is video source.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
Present embodiments provide a kind of bearing calibration of LCDs array, there is provided a main control module, LCDs
Array and video source, the main control module are electrical connected with the LCDs array, video source；Comprise the following steps：
Step S1：In replacing one piece of LCDs to LCDs array；
Step S2：According to the backlight illumination for prestoring-time attenuation curve, the work at present time of LCDs array and liquid crystal
The present intensity of display screen array, it is determined that the operating brightness of the backlight of the new LCDs changed；
Step S3：The operating brightness that the brightness adjustment of the backlight of the new LCDs changed is determined to step S2.
In the present embodiment, the work at present time in the step S2 is each liquid crystal in the LCDs array
The working time of display screen it is average.
In the present embodiment, the work at present time in the step S2 is the working time in the LCDs array
The working time of that block LCDs most long.
In the present embodiment, the work at present time in the step S2 be the LCDs array in brightness it is minimum
That block LCDs working time.
In the present embodiment, the backlight illumination-time attenuation curve for prestoring is the liquid crystal measured by laboratory facilities
The curve map of relation between display backlight brightness and cumulative operation time.
In the present embodiment, the main control module drives each LCDs drive control circuit backlight and output is believed
Number, each LCDs drive control circuit includes driver module and memory module, and the driver module drives
Hydrodynamic crystal display screen shows optical signal, and the memory module is stored with the display parameters of LCDs.
In the present embodiment, the display parameters include the working time of LCDs array, and the main control module is pre-
The backlight illumination deposited-time attenuation curve.
In the present embodiment, in adjustable liquid crystal display brightness of display screen, the main control module according to prestore backlight illumination-when
Between attenuation curve, the present intensity of LCDs array and work at present time for being obtained from memory module, it is determined that new change
LCDs backlight operating brightness；The controller notifies the driver module by the new liquid crystal changed
The brightness adjustment of the backlight of display screen is to operating brightness.
Preferably, in the present embodiment, by the brightness adjustment of the backlight of the new LCDs changed to operating brightness
Specially change backlight driver electric current so as to realize the gamma correction to the backlight.
In the present embodiment, also including step：According to default time interval, to the liquid crystal in LCDs array
Display screen carries out calibration one by one.
The present embodiment is illustrated with reference to Figure of description is more detailed.
As shown in Fig. 2 the present embodiment provides a kind of calibration equipment of LCDs array, the equipment is by LCDs
Array and main control module are constituted.The LCDs array 201 is by multiple LCDs（LCDs 2011, liquid crystal
Display screen 2012, other are not marked）It is spliced, the LCDs array connects main control module 202, the main control module connects
Connect video source 203.The main control module can be the integrated control modules such as control chip, or console, computer etc..It is main
Control module receives outer video signal, according to the parameter of LCDs array, video pictures is divided into many height display pictures
Face, is defeated by LCDs array and is shown by RS232 or DVI oral instructions.
Because liquid crystal display is with the accumulation of working time, its brightness occurs brightness decay in use for some time, very
To damage.Therefore need regularly to carry out inspection and maintenance to Mosaic screen array.In maintenance process, to those bad liquid crystal
Display screen is replaced.
As shown in figure 3, the new LCDs for replacing performs following aligning step：
S301:In one piece of LCDs of replacing to LCDs arrangement；
S302:And according to the backlight illumination for prestoring-time attenuation curve and the work at present time of LCDs array, and liquid
The present intensity of crystal display screen array, it is determined that the operating brightness of the backlight of the new LCDs changed；
In the present embodiment, the described work at present time is the working time of each LCDs in LCDs array
Average value.It can also be the working time of working time that block LCDs most long in LCDs array.I.e.
The operating time value of that minimum block LCDs of brightness.
The working time is actual conduction time if operating current is continuous current；The work if operating current is pulse current
Make Time Calculation as follows：
Working time=dutycycle × conduction time；
The pulse maximum to be reached referred to as " pulse width ".Shape, amplitude and width are the major parameters of pulse.Pulsewidth by
The cycle of signal and dutycycle determine that its computing formula is pulsewidth W=T × P（T：Cycle, P：Dutycycle）；In the present embodiment,
The pulse current is square wave current.Backlight illumination-time the attenuation curve for prestoring is measured by laboratory facilities
The curve map of relation between backlight illumination and cumulative operation time.Backlight illumination and the relation curve substantially parabolic of working time
Line style, but it is specific because material, packaging technology, PN junction temperatures, the difference of operating current, and the brightness of backlight is with accumulative work
The increase of making the time and the curve decayed is also different.As shown in figure 4, Fig. 4 illustrates shadow of the different driving electric current to light decay curvature
Ring.To randomly select 3528LED and 3014LED, be respectively divided into three groups by driving current 20mA, 25mA, 30mA carries out 1008H to Fig. 4
Light decay experiment, with the light decay of the different radiating mode LED of two kinds of comparative analysis and chromaticity coordinates drift degree, so as to study electric current pair
The influence of its colorimetric characteristics.Transverse axis in Fig. 4 is the cumulative operation time of working time, i.e. backlight, and the longitudinal axis is brightness decay
Percentage, obtains from experimental data, the decay of backlight be not it is linear, the attenuation curve of different backlights be it is different,
And influence of the different operating currents to the decay of backlight is different.
The operating brightness of the backlight of the LCDs that described determination is newly changed is specially：According to array of display
Working time, and the backlight illumination for prestoring-time attenuation curve, it is contemplated that the operating brightness of the display screen after current replacement.
As shown in figure 5, when LCD array has worked x hours, LCD array prediction brightness decay is a%, is replaced
Change in one piece of brand-new LCDs collocation array, then the estimated adjustment operating brightness of brand-new LCDs is that a% can be with
Array of display brightness has preferably matching.
In the present embodiment, if the brightness of brand-new array of display is set to 80%, liquid crystal display is in LCD array
When having worked x hours, LCD array prediction brightness decay is 80% × a%, replaces one piece of brand-new LCDs collocation
In array, then the estimated operating brightness that adjusts of brand-new LCDs is for 80% × a% can have preferably with array of display brightness
Matching.
S303:The brightness adjustment of the backlight of the new LCDs changed is calculated into screen intensity to work.
According to curtage or pulsewidth with the relation of brightness, LCDs brightness is set.
In general, to control the brightness of LED can be adjusted by simple voltage x current number, because LED is diode
There is the characteristic of forward bias voltage drop, the change for voltage is more sensitive（Different voltage, current changes are more violent）, it will usually
Brightness is adjusted by the way of fixed-voltage altering-current.The brightness of LED is not linear with electric current so that in the way of arithmetic progression
Change electric current and adjust brightness, eventually result in that LCD color colour casts are excessive, and using the method light modulation dimming range not
Greatly.
Preferably pass through pulse-width regulated LCDs brightness.The pass of PWM and brightness during pulse-width regulated brightness
It is linear relationship to be, the graph of a relation of a kind of brightness as shown in Figure 5 and pulsewidth.PWM only has 2 kinds of states, is exactly for LED
Open with closing, be adjusted by accounting of the switch within the time, different brightness are mixed out using the visual persistence phenomenon of human eye.Relative to profit
LED is adjusted with voltage or electric current, adjusting LED luminance using PWM can obtain more stable result, the brightness model for recalling
Enclose than larger, colour cast is smaller.
Due to sufficiently consider brightness curve trend it is nonlinear, and a more difficult formula go fitting, this reality
Backlight illumination-time graph that example passes through to prestore is applied, working time corresponding brightness decay percentage is extrapolated, therefore replacing
During LCDs in array of display, the display screen after replacing can be preferably adjusted, so that its brightness is adapted to liquid well
Brilliant array of display.
In the present embodiment, following aligning step is also performed for the new display screen replaced：
Operating brightness, work at present time according to LCDs and the backlight illumination-time graph for prestoring determine it is new more
The new operating brightness of the LCDs for changing.
For example, refer to Fig. 5, when LCD array has worked x hours, LCD array prediction brightness decay is
A%, then if replace be brand-new LCDs if operating brightness be set to a%.One piece of old LCDs is replaced to take
In ligand array, old LCDs has worked y hours, predicts that the operating brightness of old display screen decays to b%, then old liquid crystal
The estimated adjustment operating brightness of display screen is that a%/b% can have preferably matching with array of display brightness.
When the new LCDs changed is not brand-new, it is necessary to according to the working time of the new LCDs changed,
And the brightness under the backlight illumination for prestoring-time attenuation curve prediction current flow, after the new display screen decay changed of prediction
Operating brightness；Again by the relation of brightness-pulsewidth, the driving pulsewidth of the new LCDs changed of regulation, liquid crystal display
The operating brightness that operating brightness from after the decay regulation of screen needs to LCDs array.Thus enable with regard to old display screen
The brightness of adaptation LCD array well.
In the present embodiment, always according to default time interval, calibration one by one is carried out to the LCDs in array.
In actual use, with the growth of cumulative operation time, the decay of LCDs brightness is obvious all the more for LCDs,
But decay and nonlinear, such as Fig. 4 of the brightness of LCDs with the time.Therefore the liquid crystal display that the working time is different
Device, the depth of brightness decay is different in fact.So after array of display works a period of time, such as during 100h, to aobvious
Show that array block-by-block carries out brightness adjustment and is conducive to improving display effect.Specifically for block-by-block carries out following steps：
According to the backlight illumination for prestoring-time attenuation curve and LCDs array target operating brightness, it is determined that new replacing
The operating brightness of the setting of the backlight of LCDs, the described brightness for observing LCDs is that real work is bright
Degree, the operating brightness of setting is close or equal to actual operating brightness after being multiplied by attenuation rate；
The brightness adjustment of the backlight of LCDs to work is calculated into screen intensity.
The present embodiment also provides a kind of LCDs array apparatus, and described LCDs array is by polylith liquid crystal
Display screen is constituted, and the equipment also includes that main control module main control module drives each LCDs drive control circuit backlight
And output signal, the control circuit includes driver module and memory module, and the driver module drives liquid crystal
Show optical signal, the memory module is stored with liquid crystal display screen display parameter, the display parameters include the work of liquid crystal display array
Time, the backlight illumination that the main control module prestores-time attenuation curve;
In adjustable liquid crystal display brightness of display screen, the main control module is according to the backlight illumination for prestoring-time attenuation curve, liquid crystal
The present intensity of display screen array and the work at present time obtained from memory module, it is determined that the backlight of the new LCDs changed
The operating brightness in source；The main control module notifies the driver module by the bright of the backlight of the new LCDs changed
Degree is adjusted to operating brightness.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modification, should all belong to covering scope of the invention.
Claims (8)
1. a kind of bearing calibration of LCDs array, it is characterised in that：There is provided a main control module, LCDs array with
And video source, the main control module is electrical connected with the LCDs array, video source；Comprise the following steps：
Step S1：In replacing one piece of LCDs to LCDs array；
Step S2：According to the backlight illumination for prestoring-time attenuation curve, the work at present time of LCDs array and liquid crystal
The present intensity of display screen array, it is determined that the operating brightness of the backlight of the new LCDs changed；
Step S3：The operating brightness that the brightness adjustment of the backlight of the new LCDs changed is determined to step S2.
2. the bearing calibration of a kind of LCDs array according to claim 1, it is characterised in that：In the step S2
The work at present time be each LCDs in the LCDs array working time it is average.
3. the bearing calibration of a kind of LCDs array according to claim 1, it is characterised in that：In the step S2
The work at present time be working time that block LCDs most long in the LCDs array working time.
4. the bearing calibration of a kind of LCDs array according to claim 1, it is characterised in that：In the step S2
The work at present time be that minimum block LCDs of brightness in the LCDs array working time.
5. the bearing calibration of a kind of LCDs array according to claim 1, it is characterised in that：The back of the body for prestoring
Brightness-time attenuation curve is pass between the LCD screen backlight brightness and cumulative operation time measured by laboratory facilities
The curve map of system.
6. the bearing calibration of a kind of LCDs array according to claim 1, it is characterised in that：The main control module
Drive each LCDs drive control circuit backlight and output signal, each LCDs drive control circuit bag
Driver module and memory module are included, the driver module drives LCDs display optical signal, the storage mould
Block is stored with the display parameters of LCDs.
7. the bearing calibration of a kind of LCDs array according to claim 6, it is characterised in that：The display parameters
Working time including LCDs array, the backlight illumination that the main control module prestores-time attenuation curve.
8. the bearing calibration of a kind of LCDs array according to claim 6, it is characterised in that：It is aobvious in adjustable liquid crystal display
During display screen brightness, the main control module according to the backlight illumination for prestoring-time attenuation curve, LCDs array it is current bright
Degree and the work at present time obtained from memory module, it is determined that the operating brightness of the backlight of the new LCDs changed；Institute
Stating controller notifies the driver module by the brightness adjustment of the backlight of the new LCDs changed to operating brightness.
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| CN201710199795.7A CN106710565A (en) | 2017-03-30 | 2017-03-30 | Correction method for liquid crystal display screen array |
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Cited By (6)
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| CN107507579A (en) * | 2017-08-18 | 2017-12-22 | 上海中兴软件有限责任公司 | A kind of screen backlight control and method to set up, device, multi-screen terminal and storage medium |
| CN108257579A (en) * | 2018-01-17 | 2018-07-06 | 中兴通讯股份有限公司 | The method, apparatus and terminal of a kind of screen calibration |
| CN110610680A (en) * | 2019-09-30 | 2019-12-24 | 武汉天马微电子有限公司 | Display method, display panel, display device, luminance correction method, and storage medium |
| CN110853581A (en) * | 2019-11-06 | 2020-02-28 | 深圳市华星光电半导体显示技术有限公司 | Method for adjusting brightness of display panel and storage medium |
| WO2020042905A1 (en) * | 2018-08-28 | 2020-03-05 | 杭州海康威视数字技术股份有限公司 | Correction method and device for led module, led display screen, and storage medium |
| CN113936612A (en) * | 2021-11-01 | 2022-01-14 | 中航华东光电有限公司 | Device and method for setting backlight brightness of liquid crystal display based on calibrated brightness value |
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