CN107610641A - A kind of LED display corrects intelligent apparatus and method automatically - Google Patents
A kind of LED display corrects intelligent apparatus and method automatically Download PDFInfo
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Abstract
The invention discloses a kind of LED display to correct intelligent apparatus and method automatically, and LED display corrects intelligent apparatus automatically includes MCU, CPLD and memory；MCU is used to calculate correction coefficient；Memory is used to store correction coefficient；MCU is additionally operable to read the voltage of LED lamp bead and obtains current display parameters；CPLD is used to realize that the display parameters that multiplying, correction coefficient are formed after being multiplied with current display parameters after correction are sent to LED drive chip；The LED display corrects intelligent apparatus automatically and method is easy to implement, can realize the automatic correction of LED display.
Description
Technical field
The present invention relates to a kind of LED display to correct intelligent apparatus and method automatically.
Background technology
In recent years, LED display technology achieves significant progress, and brightness, the uniformity of colourity have reached fine
Effect, but because the wavelength error of lamp bead, different batches lamp bead are used with, and after long-term work, the light decay of lamp bead is not
Together, cause LED display display occur brightness, colourity it is uneven, greatly affected display effect.
For this problem, at present using the method for pointwise correction, that is, high-precision CCD (Charge- are utilized
Coupled Device, charge coupled cell) imaging device, gather the brightness of the Pixel Information, i.e. each point of LED display
And chrominance information, then with correcting algorithm, generate a coefficient matrix, during work, display information be multiplied with correction coefficient matrix,
Display screen is output to, with the purpose for reaching brightness and evenness is shown, lifts display effect.
At present, pointwise correction has been highly developed scheme, the display screen after correction, has good brightness, colourity
Uniformity, can solve the problems, such as that wavelength error is mixed with different batches better, but a period of time is used in LED display
Afterwards, because the light decay of each lamp bead is different, Huaping phenomenon still occurs in display screen, have a strong impact on perception, it is necessary to re-start by
Point calibration, workload is larger, particularly the installation site of some display screens, may not also possess correcting condition.
For this problem, patent " LED aging correction methods and device " (CN200710097657) provides a kind of solution
Certainly scheme, according to the respective light decay curve of red, green, blue tri coloured lantern pearl, with reference to the usage time of display screen, adjust automatically display screen
Correction coefficient, the display screen Huaping phenomenon as caused by lamp bead light decay can be alleviated to a certain extent.But the light of LED lamp bead
Decline, depend primarily on the temperature of PN junction in LED lamp bead, for example, when junction temperature is 95 DEG C, the life-span of LED lamp bead is about 20,000 hours,
And junction temperature be 75 DEG C when, the lamp bead life-span can rise to 50,000 hours, so, adjust correction coefficient only according to usage time, be
It is very inaccurate, particularly if display screen often shows static fixed picture, using the method for this patent, can aggravate on the contrary
The Huaping phenomenon of display screen.
Patent " automatic correcting method of LED and the LED with self-correcting function " (CN201110021799) is another
The individual resolving ideas based on light decay, but just for fixed junction temperature, by increasing electric current, ensure that the brightness of LED is constant, be applicable
In LED lamp, and LED display is not suitable for it.
Therefore, it is necessary to design a kind of LED display corrects intelligent apparatus and method automatically.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of LED display and correct intelligent apparatus and method automatically, should
LED display corrects intelligent apparatus automatically and method is easy to implement, can realize the automatic correction of LED display.
The technical solution of invention is as follows：
A kind of LED display auto-correction method, comprises the following steps：
Step 1：Read the voltage of each LED lamp bead in LED display；
Step 2：Calculate the junction temperature of the LED lamp bead；
Step 3：Calculate the junction temperature average of all LED lamp beads；
Step 4：Calculate light decay；
Step 5：Calculate correction coefficient；
Calculate the bibliography of correction coefficient：It is tight favorable to the people,Pan Hao,Du Bin,Summer Mingzhi.CCD camera full-color LED display screen is bright
Degree detection and correcting algorithm [J]《Central China University of Science and Technology's journal (natural science edition)》, 2016,44 (8):75-79
Step 6：Correction coefficient is coupled (multiplication) with the display data before correction, the display data formed after correction is concurrent
It is sent to LED drive chip.
In step 2, junction temperature T2=T1+ (V2-V1)/k of lamp bead,
Wherein, T1 is the current voltage of environment temperature, V2 and LED lamp bead, i.e., the voltage measured in step 1；V1 is initial
Supply voltage, k are the temperature coefficient of LED lamp bead；
Junction temperature average in step 3 is the junction temperature of a LED lamp bead, the value after being asked within one section of working time averagely.
In step 4, the calculation formula of light decay is as follows：
P=P0e-at；
In formula, P0For original photon flux, P is the luminous flux after decay, and a is the junction temperature average that a certain temperature is above-mentioned calculating
Under attenuation coefficient, t is that the working time of lamp bead at this temperature, (this time was that last correction calculates to this and calculates it
Between, the time of lamp bead energization work), e is natural constant；Attenuation coefficient is determined in itself by lamp bead, by tabling look-up；
When display screen works, MCU meeting timing sampling voltages calculate junction temperature and preserved, meanwhile, also preserve working time, upper electricity
During work, it can directly read to the working time.
A kind of LED display corrects intelligent apparatus, including MCU, CPLD and memory automatically；
MCU is used to calculate correction coefficient；Memory is used to store correction coefficient；MCU is additionally operable to read the voltage of LED lamp bead
And obtain current display parameters；
CPLD completes correction coefficient and is multiplied with current display parameters, and the display parameters formed after correction are sent to LED drives
Dynamic chip；
Correction is implemented using foregoing method.
Described memory is FLASH memory.
Described LED display corrects intelligent apparatus automatically also includes FPGA or CPLD devices；Described FPGA or CPLD
Device is used to read correction coefficient and current display parameters from memory, and performs the correction coefficient and current aobvious
Show the multiplying of parameter；And operation result is output to LED drive chip.
LED drive chip is multiple, and multiple LED drive chips are connected by bus with MCU；Multiple LED drive chips are led to
Bus is crossed with FPGA or CPLD devices to be connected.
The present invention is made up of hardware and software two parts.
Hardware components, LED of the invention show intelligent module, in common cell module, increase piece of CPLD
(Complex Programmable Logic Device, CPLD) chip, MCU
(Microcontroller Unit, micro-control unit) chip, storage chip Flash Memory, and corresponding periphery electricity
Road.
CPLD is programming device, and programming information is not lost in power down, logic-based functional programming, is suitable for completion and multiplies
Method computing, and the correction of display data, it is exactly the multiplying of an input data and correction coefficient matrix.In the present invention,
CPLD function, it is that correction coefficient matrix is read from FLASH, is multiplied with display data, then be output to driving chip, realizes aobvious
Shown after the correction of display screen.MCU is also referred to as single-chip microcomputer, for realizing that the automatic correcting algorithm of the present invention calculates, and storage information
Renewal.The computational methods of correction coefficient matrix, there are the technology and product of maturation at present, be directly transplanted to this partial code
In MCU programs.
Software function can be divided into two parts, when master control and interface section, the responsible sampling to lamp bead voltage, and with
FLASH data interaction；Second, the algorithm routine corrected automatically, and the core of the present invention.
Automatic correcting algorithm, is carried out in two steps：
1st, junction temperature calculates
As all diodes, the VA characteristic curve of LED lamp bead also can be with the rise of temperature, and floats to the left
Move, as shown in Figure 1.It is assumed that to LED with Io constant current-supplyings, when display screen is just upper electric, junction temperature is environment temperature T1, and voltage is
V1, and when junction temperature rise is T2, whole C-V characteristic moves to left, and electric current Io is constant, and voltage is changed into V2, both pressure differences, divided by
The temperature coefficient of lamp bead, so that it may the temperature rise of lamp bead junction temperature is obtained, along with the junction temperature of environment temperature at that time, as lamp bead.
2nd, correction coefficient calculates renewal
The light decay curve of LED lamp bead, it is the exponential function of working time as shown in Figure 2, calculation formula is as follows：
P=P0e-at
In above formula, P0For original photon flux, P is the luminous flux after decay, and a is the attenuation coefficient at a certain temperature, by lamp
Pearl determines that t is the working time of lamp bead at this temperature in itself.
The calculating of exponential function, amount of calculation are bigger, it is generally the case that MCU is difficult to complete, but light decay is individual very slow
Process, and real-time operation need not be carried out, it is sufficient that general display screen is once calculated when upper electric every time, if display screen
Do not power off, calculated once every 100 hours for a long time.
The present invention, can be according to display screen as a kind of new display screen intelligence module with zero offset capability
Actual use situation, display screen is corrected automatically, makes display screen in life period, remain good display shape
State.
Beneficial effect：
The LED display of the present invention corrects intelligent apparatus and method automatically, voltage when being worked by measuring display screen, and
The temperature coefficient of lamp bead, the junction temperature of lamp bead is calculated, further according to operating time, with specific algorithm, calculates the light decay curve of lamp bead,
Auto-regulating correcting coefficient, display screen is set to remain good brightness, uniformity of chromaticity.
Brief description of the drawings
Fig. 1 is lamp bead VA characteristic curve temperature drift schematic diagram；
Fig. 2 is the light decay curve synoptic diagram of lamp bead；
Fig. 3 is the theory diagram of the present invention；
Fig. 4 is the MCU software flow patterns of the present invention；
Fig. 5 is the CPLD program flow diagrams of the present invention.
Embodiment
The present invention is described in further details below with reference to the drawings and specific embodiments：
Embodiment 1：Such as Fig. 1~5, as shown in figure 1, being the VA characteristic curve temperature drift schematic diagram of LED lamp bead, T1 is in figure
C-V characteristic under normal temperature, C-V characteristic when T2 is work, LED display is driven when working with constant current, such as the I in figure0, two
Individual voltage V1 and V2 difference, divided by the temperature coefficient of lamp bead, you can obtain the junction temperature of lamp bead.Assuming that V1=3.3V, V2=3V,
Temperature coefficient is -4mV/ DEG C, then the temperature difference：
If now environment temperature is 25 DEG C, junction temperature is 100 DEG C.
As shown in Fig. 2 the light decay curve synoptic diagram for being LED lamp bead under different junction temperatures, it can be seen that in LED display
The last stage of work, light decay are very slowly specific calculation formula：P=P0e-at, in formula, P0For original photon flux, P
For the luminous flux after decay, a is the attenuation coefficient at a certain temperature, is determined in itself by lamp bead, t is the work of lamp bead at this temperature
Make the time.
As shown in figure 3, being the realization principle schematic diagram of the present invention, LED drive chip has the work(of voltage in detection lamp bead
Can, and magnitude of voltage is conveyed to MCU, MCU once, calculated primary voltage average per hour every sampling in 5 minutes, and equal according to this
Value calculates junction temperature, preserves junction temperature value.Junction temperature data are preserved in the form of three-dimensional array, respectively represent sampling sequence number, lamp bead abscissa,
Lamp bead ordinate, it can at most preserve 128 groups of data.Junction temperature data and correction coefficient matrix are all stored in FLASH, are born by MCU
Duty renewal, CPLD then reads correction coefficient matrix from FLASH, after being multiplied with display data, is output to LED drive chip, complete
Into the normal display of LED display.
As shown in figure 4, the MCU software flow patterns for the present invention.It is slow in view of temperature change, calculate per hour once i.e.
Can, after junction temperature value is saved in FLASH, when electric on each LED display, a light decay is calculated, if LED display is continuous all the time
Electrically continuous work, then every 128 hours, calculate a light decay.The light decay curve that lamp bead manufacturer provides, it is not usually continuous,
Such as every 10 DEG C of light decay curves, and the junction temperature that we are calculated, some temperature value therein will not be met just,
Therefore, it is necessary to calculate the light decay value of two temperature, then a α filtering operation is carried out, be exemplified below：
Assuming that the junction temperature average that we are calculated is T, T ∈ [T1, T2], T1 and T2 are that nearest two of distance T have
The temperature value of light decay curve, the logical P1 of light at a temperature of T1, and the logical P2 of light at a temperature of T2 are first calculated, is finally calculated and worked as with α filtering
Light under preceding temperature T leads to P, formula：
P=α P1+ (1- α) P2
In above formula,K value is related to specific lamp bead.
After the P values for calculating all lamp beads on module, it is ranked up by size, with being averaged for 10% minimum lamp bead of numerical value
On the basis of value, correction coefficient is adjusted, FLASH is arrived in storage, is called for CPLD.
As shown in figure 5, being the CPLD program work flow charts of the present invention, when electric on display screen, program automatic running, receive
The display data sended over from reception card, the correction coefficient matrix to get off from FLASH reading and savings, carries out multiplying, obtains
Display data after to correction, the driving chip being output on module, complete the calibration function of module.
Above is the implementation to the present invention has carried out specific description, but the present invention is not limited to the embodiment, for
For those skilled in the art, can with being subject to modifications and variations according to above-mentioned explanation, this improvement and, conversion is all contained in
In the application claim limited range of the present invention.
Claims (7)
1. a kind of LED display auto-correction method, it is characterised in that comprise the following steps：
Step 1：Read the voltage of each LED lamp bead in LED display；
Step 2：Calculate the junction temperature of the LED lamp bead；
Step 3：Calculate the junction temperature average of all LED lamp beads；
Step 4：Calculate light decay；
Step 5：Calculate correction coefficient；
Step 6：Correction coefficient is coupled (multiplication) with the display data before correction, the display data formed after correction is simultaneously sent to
LED drive chip.
2. LED display auto-correction method according to claim 1, it is characterised in that in step 2, the junction temperature of lamp bead
T2=T1+ (V2-V1)/k,
Wherein, T1 is the current voltage of environment temperature, V2 and LED lamp bead, i.e., the voltage measured in step 1；V1 is initial power supply
Voltage, k are the temperature coefficient of LED lamp bead；
Junction temperature average in step 3 is the junction temperature of a LED lamp bead, the value after being asked within one section of working time averagely.
3. LED display auto-correction method according to claim 2, it is characterised in that in step 4, the calculating of light decay
Formula is as follows：
P=P0e-at；
In formula, P0For original photon flux, P is the luminous flux after decay, and a is that a certain temperature is under the junction temperature average of above-mentioned calculating
Attenuation coefficient, t are the working time of lamp bead at this temperature, and e is natural constant.
4. a kind of LED display corrects intelligent apparatus automatically, it is characterised in that including MCU, CPLD and memory；
MCU is used to calculate correction coefficient；Memory is used to store correction coefficient；MCU be additionally operable to read LED lamp bead voltage and
Obtain current display parameters；
CPLD completes correction coefficient and is multiplied with current display parameters, and the display parameters formed after correction are sent to LED driving cores
Piece；
Correction is implemented using any one of claim 1-3 method.
5. LED display according to claim 4 corrects intelligent apparatus automatically, it is characterised in that described memory is
FLASH memory.
6. LED display according to claim 4 corrects intelligent apparatus automatically, it is characterised in that also including FPGA or
CPLD devices；Described FPGA or CPLD devices are used to read correction coefficient and current display parameters from memory, and hold
The multiplying of the row correction coefficient and current display parameters；And operation result is output to LED drive chip.
7. LED display according to claim 6 corrects intelligent apparatus automatically, it is characterised in that LED drive chip is more
Individual, multiple LED drive chips are connected by bus with MCU；Multiple LED drive chips pass through bus and FPGA or CPLD device phases
Even.
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Cited By (4)
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| CN112333891A (en) * | 2020-10-30 | 2021-02-05 | 中车青岛四方机车车辆股份有限公司 | Lighting lamp fault prediction and health management device and method and railway vehicle |
| CN112997242A (en) * | 2018-09-10 | 2021-06-18 | 亮锐控股有限公司 | High speed image refresh system |
| CN114927091A (en) * | 2022-05-30 | 2022-08-19 | 卡莱特云科技股份有限公司 | Heat shield effect processing method, device and system of LED display screen |
| CN114928910A (en) * | 2022-06-27 | 2022-08-19 | 长沙锐逸微电子有限公司 | LED driving chip |
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