CN100579326C - Method and control system for amending multiple light emitting diodes to output multiple monochromatic light - Google Patents
Method and control system for amending multiple light emitting diodes to output multiple monochromatic light Download PDFInfo
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Abstract
A method corrects the multiple monochromatic lights output from multiple light emitting diodes (LED), comprising the following: step (a) providing a reference value for a plurality of monochromatic lights; step(b) providing a brightness reference value for the synthesis light of the multiple monochromatic lights; step(c) sensing the light signals of the plurality of monochromatic lights output from the plurality of LEDs; step (d) sensing the light signals of the synthesis light of the plurality of monochromatic lights; step(e) comparing the reference value of plurality of monochromatic lights provided in step(a) with the light signals of the plurality of monochromatic lights sensed in step (c); step(f) comparing the brightness reference value of the synthesis light of the plurality of monochromatic lights provided in step (b) with the light signals of the synthesis light of the plurality of monochromatic lights provided in step (d); and step(g) ,adjusting the plurality of monochromatic lights output from the LED according to the comparative results from step(e) and step(f).
Description
Technical field
The present invention relates to a kind of led control system, particularly relate to a kind of a plurality of monochromatic method and led control system that a plurality of light-emitting diode is exported of proofreading and correct.
Background technology
(Light-Emitting Diode LED) often has the problem of colour cast (non-white) to existing employing light-emitting diode for the backlight module of light source, cause the panel picture to produce colour cast.This reason is not that wherein spare part has problem, but because the luminous look district of LED itself is difficult to be controlled in same quality.Human eye is a kind of complicated process to the perception of color, for the description with color is quantized, international lighting association (CIE) is according to standard observation person's visual experiment, human eye is noted down the caused visual impression of the radiant energy of different wave length, calculated the color matching function (being so-called CIE 1931 ColorMatching Function) of Red Green Blue.And according to this color matching function, the description of color can be quantized, and can represent by chromaticity coordinates (chromaticity coordinate).Color for display shows also can use this kind chromaticity coordinates to represent.Because it is more and more higher that human eye requires for color quality, therefore still need the good backlight module of luminous color quality to be used in the display, obtain excellent color.
For instance, if use the light source of the trichromatic light-emitting diode of RGB as backlight module, light-emitting diode can be because of variations in temperature and through changing light output brightness after one period service time, the variation of this light output brightness is not identical at the light-emitting diode of different colours, and then cause the unstable skew with chromaticity coordinates of light-source brightness, in order to improve this disappearance, in U.S. Patent number 6630801,6894442,6441558,6127783,6495964,6510995,6753661,6552495,6992803, disclosed the result who utilizes the RGB primaries that sensing RGB light-emitting diode sent in 6998594 the RGB light-emitting diode has been carried out loop circuit control, use and revise the led light source problem of unstable, be that the brightness value of the light that can't be directly synthesized with the RGB primaries is as the feedback signal as the feedback signal only with three sensing signals of RGB, meaning promptly can't directly obtain the brightness value of backlight module institute output light source, the brightness value of backlight module institute output light source is that the brightness value with the RGB primaries calculates, so existing control method all can't directly be controlled the brightness of backlight module institute output light source, and fails to improve veritably the led light source problem of unstable.
Summary of the invention
The object of the present invention is to provide a kind of a plurality of monochromatic method and led control system that a plurality of light-emitting diode is exported of proofreading and correct, can't directly control to solve prior art, and fail to improve veritably the led light source problem of unstable the brightness of backlight module institute output light source.
The present invention discloses a kind of a plurality of monochromatic method that a plurality of light-emitting diode is exported of proofreading and correct, it includes the following step: this a plurality of monochromatic reference values (a) are provided; (b) brightness reference value of the light that this a plurality of monochromatic light is provided is synthesized; (c) these a plurality of monochromatic smooth signals of being exported of this a plurality of light-emitting diode of sensing; (d) the light signal of the light that synthesized of this a plurality of monochromatic light of sensing; (e) these a plurality of monochromatic smooth signals of being sensed of these a plurality of monochromatic reference values that provided of comparison step (a) and step (c); (f) this brightness reference value of the light that this a plurality of monochromatic light synthesized that provided of comparison step (b) and the light signal of the light that this a plurality of monochromatic light synthesized that step (d) is sensed; And (g) adjust these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the comparison result of step (e) and step (f).
The present invention has also disclosed a plurality of monochromatic led control system that a plurality of light-emitting diode of a kind of recoverable is exported, it includes a reference value generation device, be used for producing a brightness reference value of these a plurality of monochromatic reference values and the light that this a plurality of monochromatic light synthesized, one optical sensing subassembly, be used for the light signal of the light that this a plurality of monochromatic smooth signal and this a plurality of monochromatic light synthesized that this a plurality of light-emitting diode of sensing exported, one colourity comparison device, be coupled in this reference value generation device and this optical sensing subassembly, be used for comparing these a plurality of monochromatic reference values that this reference value generation device produced and these a plurality of monochromatic smooth signals that this optical sensing subassembly sensed, one brightness comparison device, be coupled in this reference value generation device and this optical sensing subassembly, be used for comparing this brightness reference value of the light that this a plurality of monochromatic light synthesized that this reference value generation device produced and the light signal of the light that this a plurality of monochromatic light synthesized that this optical sensing subassembly sensed, an and control device, be coupled in this colourity comparison device and this brightness comparison device, be used for adjusting these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the comparison result of this colourity comparison device and this brightness comparison device.
Description of drawings
Fig. 1 is the function block schematic diagram of led control system of the present invention.
The flow chart of the red light that Fig. 2 exports for led control system correction red light LED of the present invention, green light LED, blue-light led, green light, blue light.
Fig. 3 is that gamma correction behind the led control system input reference first time of the present invention, current correction and colour temperature change schematic diagram.
Fig. 4 is that gamma correction behind the led control system input reference second time of the present invention, current correction and colour temperature change schematic diagram.
Fig. 5 has the function block schematic diagram of the led control system of temperature sensing function for the present invention.
The reference numeral explanation
10 led control system 12a red light LED
12b green light LED 12c blue-light led
14 optical sensing subassembly 14a red light sensing cells
14b green light sensing cell 14c blue light sensing cell
14d white light sensing cell 16 reference value generation devices
18 input interfaces, 20 amplifiers
22 colourity comparison devices, 24 brightness comparison devices
26 drive circuits, 28 control device
30 temperature sensing units, 32 temperature comparison devices
Step 100,102,104,106,108,110,112
Embodiment
See also Fig. 1, Fig. 1 is the present invention's one light-emitting diode (Light-Emitting Diode, LED) the function block schematic diagram of control system 10, led control system 10 be used for proofreading and correct a red light LED12a, a green light LED12b and a blue-light led 12c red light, green light and the blue light of output respectively.Red light, green light and blue light can synthesize white light with the light source as a backlight module.
Reference value generation device 16 is used for producing the reference value of red light, green light and blue light and a brightness reference value of the white light that red light, green light and blue light are synthesized.
Input interface 18 is coupled in reference value generation device 16, be used to provide the user and import brightness value, chromaticity coordinates value and color temperature value, for instance, the user can be by color parameters such as input interface 18 input CIE1931 chromaticity coordinates values or colour temperatures, and the reference value generation device 16 ratio yield value (meaning is the ratio of any two primitive color lights in the primaries) that can produce the ratio of red light brightness and green light brightness and blue light brightness and green light brightness according to color parameters such as this chromaticity coordinates value that input interface 18 transmitted or colour temperatures is with as the reference value afterwards; Or the user can directly import the brightness value of red light, green light and blue light by input interface 18, and reference value generation device 16 ratio (meaning is the ratio of any two primitive color lights in the primaries) that can produce the ratio of red light brightness and green light brightness and blue light brightness and green light brightness according to the brightness value that input interface 18 is transmitted is with as the reference value afterwards; In addition, the user can be by a brightness value of input interface 18 input white lights, and reference value generation device 16 can produce the brightness reference value of white light according to this brightness value that input interface 18 is transmitted afterwards.
See also Fig. 2, the flow chart of the red light that Fig. 2 is exported for led control system 10 correction red light LED12a of the present invention, green light LED12b, blue-light led 12c, green light, blue light, method of the present invention comprises the following step:
Step 100: a plurality of monochromatic reference values are provided.
Step 102: the brightness reference value that the light that a plurality of monochromatic light synthesizes is provided.
Step 104: these a plurality of monochromatic smooth signals that a plurality of light-emitting diode of sensing is exported.
Step 106: these a plurality of monochromatic light of sensing the light signal of synthetic light.
Step 108: these a plurality of monochromatic smooth signals that this a plurality of monochromatic reference value and step 104 sensed that comparison step 100 provides.
Step 110: the light signal of the light that this a plurality of monochromatic light synthesized that this brightness reference value and step 106 sensed of the light that this a plurality of monochromatic light synthesized that comparison step 102 provides.
Step 112: adjust these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the step 108 and the comparison result of step 110.
In this above-mentioned steps is done an explanation, provide a plurality of monochromatic reference values and step 102 that a brightness reference value aspect of the light that a plurality of monochromatic light synthesizes is provided in step 100, at first the user can be by input interface 18 input brightness values, chromaticity coordinates value, or color temperature value, use and utilize reference value generation device 16 to produce corresponding red light, green light, blue light and white light reference value.For instance, the user can be by color parameters such as input interface 18 input CIE1931 chromaticity coordinates XY values or colour temperatures, with the reference value as a standard colorimetric (not colour cast), and reference value generation device 16 can calculate the standard ratio of primaries according to this chromaticity coordinates value that input interface 18 is transmitted.For example when input value during for chromaticity coordinates XY value, can be according to the color science formula:
In the hope of red light brightness, green light brightness and blue light brightness; If during the input color temperature value, can in the hope of pairing chromatic value, utilize aforesaid color science formula promptly also can try to achieve red light brightness, green light brightness and blue light brightness again according to Planck blackbody radiance curve (Planckian locus).Because human eye is the most responsive for green light, so can green light be that benchmark calculates the ratio of red light brightness and green light brightness and the ratio of blue light brightness and green light brightness, also maybe can adopt another primitive color light is that benchmark calculates the ratio of other two primitive color light with respect to this primitive color light, this moment, the ratio that drawn was red light, green light, the luminance standard ratio of blue light under standard colorimetric (not colour cast) situation, and as the reference value of red light, green light, blue light; Perhaps the user can directly import the brightness value of red light, green light and blue light by input interface 18, this moment, the brightness ratio value of red light, green light and blue light was luminance standard ratio under standard colorimetric (not colour cast) situation, and the standard ratio that reference value generation device 16 also can produce primaries according to the brightness value that input interface 18 is transmitted is with as the reference value.Moreover the user can be by the normal brightness value of input interface 18 input white lights, and reference value generation device 16 can produce the brightness reference value of white light according to this normal brightness value that input interface 18 is transmitted afterwards.
In these a plurality of monochromatic smooth signals that a plurality of light-emitting diode of step 104 sensing is exported, red light sensing cell 14a, green light sensing cell 14b, blue light sensing cell 14c can distinguish the brightness or the intensity of red light, green light and blue light that sensing red light LED12a, green light LED12b and blue-light led 12c exported; And the brightness or the intensity of white light sensing cell 14d sensing red light, green light and the white light that blue light synthesized.Next amplifier 20 can amplify the light signal of red light, green light, blue light and red light that red light sensing cell 14a, green light sensing cell 14b, blue light sensing cell 14c, white light sensing cell 14d are sensed respectively, green light, white light that blue light synthesized.
These a plurality of monochromatic smooth signals that this a plurality of monochromatic reference value and step 104 sensed that provide in step 108 comparison step 100 and step 110 are compared the light signal aspect of the light that this a plurality of monochromatic light synthesized that this brightness reference value and step 106 sensed of the light that this a plurality of monochromatic light synthesized that step 102 provides, the red light that colourity comparison device 22 comparison reference value generation devices 16 are transmitted, green light, the amplification that the reference value of blue light and amplifier 20 are transmitted is red light later, green light, the light signal of blue light, for instance, the amplification that colourity comparison device 22 is transmitted according to amplifier 20 is red light later, green light, the light signal of blue light calculates red light LED12a, the ratio of the red light brightness that green light LED12b and blue-light led 12c are exported and the ratio of green light brightness and blue light brightness and green light brightness, the reference value of the ratio of the ratio of red light brightness of being transmitted with reference value generation device 16 and green light brightness and blue light brightness and green light brightness is compared again, and comparison result transferred to control device 28, control device 28 can be according to the PID PID control method doing loop circuit control, as following formula:
Wherein e (t) is the margin of error, K
pBe proportional gain factor, T
iBe integration time constant, T
dBe derivative time constant.And then the proportional gain value (G of adjustment red light brightness and green light brightness
R/G) and the proportional gain value (G of blue light brightness and green light brightness
B/G), the red light brightness after feasible the adjustment is identical with the ratio and the reference value of the ratio of green light brightness and blue light brightness and green light brightness, and reaches the purpose of proofreading and correct colourity; In like manner, brightness comparison device 24 also can be compared this brightness reference value of the white light that reference value generation device 16 transmitted and amplification that amplifier 20 the is transmitted luminance signal of white light later, and comparison result transferred to control device 28, control device 28 is also controlled to do the loop circuit according to the PID PID control method as above-mentioned formula, and then adjusts the luminance gain value (G of red light, green light and blue light respectively
I), brightness value that make to adjust red light later, green light, white light that blue light synthesized is identical with brightness reference value, and reaches the purpose of correcting luminance.
Adjust these a plurality of monochromatic light that this a plurality of light-emitting diode is exported in step 112 according to the step 108 and the comparison result of step 110, control device 28 is imported corresponding driving signal to drive circuit 26 according to above-mentioned adjustment result, use the curtage that control Driver Circuit 26 drives red light LED12a, green light LED12b, blue-light led 12c, for instance, being the above voltage that drives red light LED12a, green light LED12b, blue-light led 12c can be corrected as follows respectively:
(proofreading and correct the voltage/current of rear drive red light LED12a)=(voltage/current of original driving red light LED12a) * (G
I) * (G
R/G);
(proofreading and correct the voltage/current of rear drive blue-light led 12c)=(voltage/current of original driving blue-light led 12c) * (G
I) * (G
B/G);
(proofreading and correct the voltage/current of rear drive green light LED12b)=(voltage/current of original driving green light LED12b) * (G
I)
Below above-mentioned action principle done one illustrate more specifically, with use primaries at least each 80 hundred million light 99235 light-emitting diode be example, when colourity XY value is input as (0.33,0.33) time, conversion can obtain red light brightness, green light brightness, blue light brightness through the color science formula, after calculating, can obtain the ratio 0.386605 of red light brightness and green light brightness and the ratio 0.074277 of blue light brightness and green light brightness, the reference value that can obtain importing.Perhaps input color temperature reference value 5600K, can obtain colourity XY value according to Planck black-body radiation curve and be about (0.33,0.33), again through after the conversion of color science formula and calculating, also can try to achieve the ratio 0.386605 of red light brightness and green light brightness, and the ratio 0.074277 of blue light brightness and green light brightness, the also reference value that can obtain importing.And the white brightness input value is the reference value that 2000 lumens are used as brightness.Brightness value that reference value generation device 16 is transmitted according to input interface 18 and chromaticity coordinates value produce the reference value of this brightness reference value of white light and red light, green light, blue light.If opening the initial colourity XY value of red light LED12a, green light LED12b, blue-light led 12c is (0.268,0.313), the ratio 0.254495 of initial red light brightness and green light brightness, the ratio 0.099976 of blue light brightness and green light brightness, the initial current value is respectively 52mA, 157mA, 319mA, and this moment, brightness and temperature were respectively 3094.6 lumens and 44 ℃.The signal that detects red light, green light, blue light and white light that red light LED12a, green light LED12b and blue-light led 12c exported through 12bit red light sensing cell 14a, green light sensing cell 14b, blue light sensing cell 14c and white light sensing cell 14d is 532,1836,3732,1267 in regular turn, and it is 834,2520,5122,49686 in regular turn that the signal of input amplifier 20 is converted to the red light of 8bit, green light, blue light and white light signal.Export this signal amplification to colourity comparison device 22 and brightness comparison device 24 in regular turn via amplifier 20, the reference value that the light signal comparison reference value generation device 16 of the ratio of the ratio of red light brightness and green light brightness and blue light brightness and green light brightness was produced after colourity comparison device 22 amplified according to amplifier 20, with reference value to some extent during difference, approach reference value with pid control mode through calculating via control device 28, and the proportional gain value of output red brightness and green light brightness ratio and blue light brightness and green light brightness ratio is respectively 1.5197 with adjustment, 0.7432; The reference value that the light signal comparison reference value generation device 16 of white light was produced after brightness comparison device 24 amplified according to amplifier 20, with reference value to some extent during difference, approach reference value with pid control mode through calculating via control device 28 with adjustment, and the luminance gain value 0.646 of output red light, green light, blue light.See also Fig. 3, Fig. 3 is that gamma correction behind the led control system input reference 10 first time of the present invention, current correction and colour temperature change schematic diagram.The result that control device 28 is adjusted according to colourity comparison device 22 and brightness comparison device 24 proofreaies and correct drive circuit 26 and drives red light LED12a, green light LED12b, electric current 31.4mA, the 94.8mA of blue-light led 12c, 192.6mA.Via red light, green light, blue light colourity XY value after respectively drive current being exported to red light LED12a, green light LED12b, blue-light led 12c output after proofreading and correct and proofreading and correct is (0.3301,0.3301), the ratio of red light brightness and green light brightness be 0.38676 and the ratio of blue light brightness and green light brightness be 0.074307, the brightness and the temperature that are measured behind the elapsed time T1 are respectively 1999.1 lumens and 5600K, as shown in Figure 4, reach the purpose of adjusting correction.
In addition, from the above, behind input one group of reference brightness, color temperature value or chromatic value, import second group of reference value again or organize reference value more, also can realize proofreading and correct purpose.For instance, import second group of colour temperature 4300K or colourity XY value (0.37,0.37) time, through obtaining the ratio 0.457923 of corresponding red light brightness and green light brightness after the said method conversion, the ratio 0.049947 of blue light brightness and green light brightness, use the reference value of being used as colourity, the brightness input value is the reference value that 1500 lumens are used as brightness.Reference value generation device 16 produces reference value and sends it to colourity comparison device 22 and brightness comparison device 24 according to above-mentioned input value, this moment, the signal according to red light, green light, blue light and white light that 12bit red light sensing cell 14a, green light sensing cell 14b, blue light sensing cell 14c and white light sensing cell 14d are measured was 321,1109,2253,818 in regular turn, and it is 503,1522,3092,32078 in regular turn that the signal that inputs to amplifier 20 is converted to the red light of 8bit, green light, blue light and white light signal.Export this signal amplification to colourity comparison device 22 and brightness comparison device 24 in regular turn via amplifier 20, colourity comparison device 22 is according to reference value, approach reference value with pid control mode through calculating via control device 28, and the proportional gain value of output red brightness and green light brightness ratio and blue light brightness and green light brightness ratio is respectively 1.1845,0.6724 with adjustment; Brightness comparison device 24 amplifies the light signal comparison reference value of white light later according to amplifier 20, approaches reference value with pid control mode through calculating with adjustment via control device 28, and the luminance gain value 0.7504 of output red light, green light, blue light.See also Fig. 4, Fig. 4 is that gamma correction behind the led control system input reference 10 second time of the present invention, current correction and colour temperature change schematic diagram.The result that control device 28 is adjusted according to colourity comparison device 22 and brightness comparison device 24 proofreaies and correct drive circuit 26 and drives red light LED12a, green light LED12b, electric current 21.6mA, the 63.6mA of blue-light led 12c, 129.2mA.As shown in Figure 4, via respectively drive current is exported to red light LED12a, green light LED12b, blue-light led 12c output purpose red light, green light after proofreading and correct, blue light colourity XY value is (0.3701,0.3701), the ratio of red light brightness and green light brightness be 0.458106 and the ratio of blue light brightness and green light brightness be 0.049967, brightness that is measured behind the elapsed time T2 and temperature are 1500.1 lumens and 5600K, also can reach to adjust the purpose of proofreading and correct.
In addition, light source used in the present invention can be not limited to the primaries of red light, green light, blue light, also can use red light, green light, blue light and purple light four color light source, and its control principle is same as aforementioned principles, no longer describes in detail in this; Moreover in colourity control and brilliance control aspect, colourity control not necessarily needs to adjust simultaneously the luminance gain value (G of red light, green light and blue light
I), can adjust wherein a kind of brightness output of coloured light earlier, meet the chroma reference value of being imported in other two kinds of coloured light of colourity control with the ratio that before had been adjusted coloured light more afterwards and get final product.
In addition, see also Fig. 5, Fig. 5 has the function block schematic diagram of the led control system 10 of temperature sensing function for the present invention.Can influence the usefulness of light-emitting diode because the backlight module temperature inside raises, therefore, led control system 10 also can comprise a temperature sensing unit 30 and a temperature comparison device 32.Temperature sensing unit 30 is arranged in the backlight module temperature in order to the sensing backlight module, and to produce a sensing temperature value, specifically, temperature sensing unit 30 is used for a plurality of monochromatic temperature that a plurality of light-emitting diode of sensing is exported.Temperature comparison device 32 is coupled in temperature sensing unit 30, reference value generation device 16 and control device 28, be used for comparing the sensing temperature value that temperature reference value that reference value generation device 16 produced and temperature sensing unit 30 are transmitted, the user can be by input interface 18 input temp reference values.Control device 28 is used for according to the comparison result control Driver Circuit 26 driving red light LED12a of temperature comparison device 32, the curtage of green light LED12b, blue-light led 12c.
A plurality of monochromatic method and the led control system exported compared to a plurality of light-emitting diode of existing correction, the present invention use a plurality of monochromatic indivedual signals that sense as the control of the loop circuit of colourity, add the loop circuit control of the brightness of the light source that this a plurality of monochromatic light that senses synthesizes as brightness, and the temperature value that is sensed is as the loop circuit control of LED brightness, just can supply thus to have now only divides other sensing signal as the feedback signal with primaries, but the brightness value of backlight module institute output light source is to divide other shortcoming that brightness value COMPREHENSIVE CALCULATING is drawn with primaries, so can directly carry out feedback control, and improve the LED source problem of unstable veritably to the brightness of light source.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (16)
1. proofread and correct a plurality of monochromatic method that a plurality of light-emitting diode is exported for one kind, it includes the following step:
(a) provide this a plurality of monochromatic reference values;
(b) brightness reference value of the light that this a plurality of monochromatic light is provided is synthesized;
(c) these a plurality of monochromatic smooth signals of being exported of this a plurality of light-emitting diode of sensing;
(d) the light signal of the light that synthesized of this a plurality of monochromatic light of sensing;
(e) these a plurality of monochromatic smooth signals of being sensed of these a plurality of monochromatic reference values that provided of comparison step (a) and step (c);
(f) this brightness reference value of the light that this a plurality of monochromatic light synthesized that provided of comparison step (b) and the light signal of the light that this a plurality of monochromatic light synthesized that step (d) is sensed; And
(g) adjust these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the step (e) and the comparison result of step (f).
2. the method for claim 1, wherein step (a) comprises provides coordinate figure of the same colour, uses these a plurality of monochromatic reference values of generation.
3. the method for claim 1, wherein step (a) comprises provides a color temperature value, uses these a plurality of monochromatic reference values of generation.
4. the method for claim 1, wherein step (a) ratio that comprises ratio that red light brightness and a green light brightness are provided and a blue light brightness and this green light brightness is these a plurality of monochromatic reference values, and step (b) comprises the brightness reference value that a white light is provided.
5. the method for claim 1, wherein step (c) comprises the brightness of these a plurality of monochromatic smooth signals that this a plurality of light-emitting diode of sensing exported, described monochromatic light is red light, green light and blue light, and step (d) comprises the brightness of the light signal of this red light of sensing, green light and the light that blue light synthesized, and this synthetic light is white light.
6. the method for claim 1, the light signal of these a plurality of monochromatic smooth signals that it also comprises amplification and is sensed and the light that this a plurality of monochromatic light synthesized of institute's sensing.
7. the method for claim 1, wherein step (g) comprises the curtage that drives these a plurality of light-emitting diodes according to the step (e) and the comparison result adjustment of step (f).
8. led control system, in order to control a plurality of monochromatic light that a plurality of light-emitting diode is exported, it includes:
One reference value generation device is used for producing a brightness reference value of these a plurality of monochromatic reference values and the light that this a plurality of monochromatic light synthesized;
One optical sensing subassembly is used for the light signal of the light that this a plurality of monochromatic smooth signal and this a plurality of monochromatic light synthesized that this a plurality of light-emitting diode of sensing exported;
One colourity comparison device is coupled in this reference value generation device and this optical sensing subassembly, is used for comparing these a plurality of monochromatic reference values that this reference value generation device produced and these a plurality of monochromatic smooth signals that this optical sensing subassembly sensed;
One brightness comparison device, be coupled in this reference value generation device and this optical sensing subassembly, be used for comparing this brightness reference value of the light that this a plurality of monochromatic light synthesized that this reference value generation device produced and the light signal of the light that this a plurality of monochromatic light synthesized that this optical sensing subassembly sensed; And
One control device is coupled in this colourity comparison device and this brightness comparison device, is used for adjusting these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the comparison result of this colourity comparison device and this brightness comparison device.
9. led control system as claimed in claim 8 wherein also comprises an input interface, is coupled in this reference value generation device, is used to provide the user and imports a brightness value or coordinate figure of the same colour.
10. led control system as claimed in claim 9, wherein this reference value generation device this brightness value of being used for transmitting according to this input interface produces this brightness reference value of the light that this a plurality of monochromatic light synthesizes.
11. led control system as claimed in claim 9, wherein this reference value generation device this chromaticity coordinates value of being used for transmitting according to this input interface produces red light brightness and the ratio of green light brightness and ratio of blue light brightness and green light brightness.
12. led control system as claimed in claim 8, wherein this optical sensing subassembly comprises a red light sensing cell, a green light sensing cell, a blue light sensing cell and a white light sensing cell, this red light sensing cell, this green light sensing cell and this blue light sensing cell are used for the brightness of red light, green light and blue light that this a plurality of light-emitting diode of sensing exported respectively, and this white light sensing cell is used for the brightness of red light, green light and the white light that blue light synthesized that this a plurality of light-emitting diode of sensing exported.
13. led control system as claimed in claim 8, it also comprises an amplifier, be coupled in this optical sensing subassembly, be used for amplifying the light signal of the light that this a plurality of monochromatic light synthesized of these a plurality of monochromatic smooth signals that this a plurality of light-emitting diode that this optical sensing subassembly senses exports and institute's sensing.
14. led control system as claimed in claim 8, it also comprises one drive circuit, be coupled in these a plurality of light-emitting diodes and this control device, be used for driving this a plurality of these a plurality of monochromatic light of light-emitting diode output, wherein this control device is used for controlling the curtage that this drive circuit drives these a plurality of light-emitting diodes according to the comparison result of this colourity comparison device and this brightness comparison device.
15. led control system as claimed in claim 8, wherein these a plurality of light-emitting diodes comprise a red light light-emitting diode, a green light light-emitting diode and a blue light light-emitting diode.
16. led control system as claimed in claim 8, it also comprises a temperature sensing unit and a temperature comparison device, this temperature sensing unit is used for these a plurality of monochromatic temperature that this a plurality of light-emitting diode of sensing exported to produce a sensing temperature value, this temperature comparison device is coupled in this temperature sensing unit, this reference value generation device and this control device, be used for comparing a temperature reference value and this sensing temperature value that this reference value generation device is produced, this control device is used for adjusting these a plurality of monochromatic light that this a plurality of light-emitting diode is exported according to the comparison result of this temperature comparison device.
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| CN200710002172A CN100579326C (en) | 2007-01-12 | 2007-01-12 | Method and control system for amending multiple light emitting diodes to output multiple monochromatic light |
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| CN200710002172A CN100579326C (en) | 2007-01-12 | 2007-01-12 | Method and control system for amending multiple light emitting diodes to output multiple monochromatic light |
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| US11917340B2 (en) | 2021-04-14 | 2024-02-27 | Coretronic Corporation | Projection device and brightness control method thereof |
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| US8330378B2 (en) * | 2009-01-28 | 2012-12-11 | Panasonic Corporation | Illumination device and method for controlling a color temperature of irradiated light |
| CN102782442A (en) * | 2010-01-20 | 2012-11-14 | 法罗技术股份有限公司 | Coordinate measuring machine having an illuminated probe end and method of operation |
| CN103050109B (en) * | 2012-12-25 | 2015-04-29 | 广东威创视讯科技股份有限公司 | Color correction method and system for multi-screen display device |
| CN103025030B (en) * | 2012-12-27 | 2016-03-23 | 余姚市吉佳电器有限公司 | LED tunnel illumination light adjusting system |
| RU2602340C2 (en) | 2013-11-13 | 2016-11-20 | Кэнон Кабусики Кайся | Display device and control method thereof, light-emitting device and control method thereof, as well as non-temporary computer-readable data storage medium |
| JP6436336B2 (en) * | 2014-02-13 | 2018-12-12 | Ｔｉａｎｍａ Ｊａｐａｎ株式会社 | Backlight light source device and liquid crystal display device |
| CN103945588B (en) * | 2014-05-12 | 2016-05-04 | 福州大学 | The even light-dimming method of a kind of large-area OLEDs module |
| CN104776351B (en) * | 2015-03-24 | 2017-07-28 | 苏州佳世达电通有限公司 | The optical source correcting method of display device and display device |
| CN108806618B (en) * | 2018-06-12 | 2021-08-24 | 深圳Tcl新技术有限公司 | Display screen and display device of tricolor light |
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| US11917340B2 (en) | 2021-04-14 | 2024-02-27 | Coretronic Corporation | Projection device and brightness control method thereof |
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