CN112763059A

CN112763059A - Dimming curve testing method and device

Info

Publication number: CN112763059A
Application number: CN202011564417.2A
Authority: CN
Inventors: 黄荣丰; 陈志曼; 王国海
Original assignee: Guangzhou Yajiang Photoelectric Equipment Co Ltd
Current assignee: Guangzhou Yajiang Photoelectric Equipment Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-05-07
Anticipated expiration: 2040-12-25
Also published as: CN112763059B

Abstract

The invention provides a dimming curve testing method and equipment, wherein the method comprises the following steps: testing brightness data with the gray scale from 90 to 255 to obtain a high-brightness dimming curve; testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve; calculating the brightness ratio of the gray scale 90, and multiplying the low-brightness dimming curve by the brightness ratio to obtain a corrected low-brightness dimming curve; and fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine the dimming curve. According to the invention, the high-brightness dimming curve and the low-brightness dimming curve are measured, and the low-brightness dimming curve is scaled according to the proportion, so that the accurate dimming curve is obtained.

Description

Dimming curve testing method and device

Technical Field

The invention relates to the technical field of lighting, in particular to a dimming curve testing method and device.

Background

The accuracy of the dimming curve can influence the color change of the dimming process and the offset of the color temperature, the test range of the current dimming curve test is limited, the appropriate distance needs to be selected by multiple times of measurement, the low brightness can be tested, and the high brightness cannot exceed the range. At the present stage, the brightness of the lamp is mainly reduced by adopting modes such as an atomizing sheet and the like to test, the high brightness is prevented from exceeding the range, but the low brightness test time is long, the influence of ambient light is easily caused, and the measurement accuracy is low. Therefore, the high-brightness and low-brightness data can be measured accurately at the same time, and fitting of an accurate dimming curve becomes a technical problem to be solved at present.

Disclosure of Invention

The invention provides a dimming curve testing method and device, which are used for solving the problem that in the prior art, a high-brightness curve and a low-brightness curve cannot be accurately and simultaneously measured, so that an accurate dimming curve cannot be fitted.

In a first aspect, the present invention provides a dimming curve testing method, including:

testing brightness data with the gray scale from 90 to 255 to obtain a high-brightness dimming curve;

testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve;

calculating the brightness ratio of the gray scale 90, and multiplying the low-brightness dimming curve by the brightness ratio to obtain a corrected low-brightness dimming curve;

and fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine the dimming curve.

Alternatively, the gray scale is changed according to a time preset threshold.

Alternatively, the luminance ratio K of the gray scale 90 is E90/Ed90, where E90 is a high luminance dimming curve of the gray scale 90 and Ed90 is a low luminance dimming curve of the gray scale 90.

Optionally, the high brightness dimming curve and the low brightness dimming curve are saved to the terminal.

Optionally, according to the low brightness data of the gray scale 0, combining the high brightness dimming curve and the corrected low brightness dimming curve to obtain the brightness data of the gray scale from 0 to 255; the dimming curve is determined from the luminance data from 0 to 255 gray levels.

In another aspect, the present invention provides a dimming curve testing apparatus, including:

the high-brightness dimming test module is used for testing brightness data with the gray scale from 90 to 255 to obtain a high-brightness dimming curve;

the low-brightness dimming test module is used for testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve;

the correction module is used for calculating the brightness ratio of the gray scale 90, multiplying the low-brightness curve by the brightness ratio and obtaining a corrected low-brightness dimming curve;

and the fitting module is used for fitting the high-brightness dimming curve and correcting the low-brightness dimming curve to determine the dimming curve.

Optionally, the high brightness dimming test module comprises: the LED lamp comprises an LED lamp, photoelectric detection equipment and a computer; the computer comprises an LED lamp control program and a detection equipment control program; the LED lamp control program controls the LED lamp to change the gray scale from 90 to 255 according to a time preset threshold; and the detection equipment control program controls the photoelectric detection equipment to test brightness data at preset threshold intervals.

Optionally, the low brightness dimming test module comprises: the system comprises an LED lamp, photoelectric detection equipment, a computer and a condenser; the computer comprises an LED lamp control program and a detection equipment control program; the LED lamp control program controls the LED lamp to change the gray scale from 1 to 90 according to a time preset threshold; and the detection equipment control program controls the photoelectric detection equipment to test brightness data at preset threshold intervals.

Optionally, the collecting lens is located at the light outlet of the LED lamp, and the probe of the photoelectric detection device is located at a focus point of the collecting lens.

Optionally, the time preset threshold comprises 2 seconds.

According to the technical scheme, the high-brightness dimming curve is obtained by testing the brightness data with the gray scale from 90 to 255; testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve; calculating the brightness ratio of the gray scale 90, and multiplying the low-brightness dimming curve by the brightness ratio to obtain a corrected low-brightness dimming curve; and fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine the dimming curve. According to the invention, the high-brightness dimming curve and the low-brightness dimming curve are measured, and the low-brightness dimming curve is scaled according to the proportion, so that the accurate dimming curve is obtained.

Drawings

Fig. 1 is a schematic flowchart of a dimming curve testing method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a dimming curve testing apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a high brightness dimming curve testing apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a low-luminance dimming curve testing apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic flow chart illustrating a dimming curve testing method according to an embodiment of the present invention, and as shown in fig. 1, the dimming curve testing method according to the embodiment is as follows.

101. Testing brightness data with the gray scale from 90 to 255 to obtain a high-brightness dimming curve;

102. testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve;

103. calculating the brightness ratio of the gray scale 90, and multiplying the low-brightness dimming curve by the brightness ratio to obtain a corrected low-brightness dimming curve;

104. and fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine the dimming curve.

In a particular embodiment, step 101 may include: the dimming grayscale of the LED lamp varies from 90 to 255 according to a time preset threshold, where the time threshold may preferably be 2 seconds, and the LED lamp increases one grayscale every 2 seconds, and the photodetection device measures the luminance data of the LED lamp synchronously at intervals of the same time preset threshold, for example, when the grayscale is 90, the luminance data is 365.79, and when the grayscale is 255, the luminance data is 5821.7, so as to obtain a high-luminance dimming curve S1{ E90, E91 … …, E254, E255}, as shown in table 1, the high-luminance dimming curve of this embodiment is as follows.

TABLE 1 high brightness dimming Curve

Grey scale	90	91	92	93	94	95	96	97	98	99
											E	365.79	378.41	386.47	396.93	410.18	423.38	433.16	448.03	459.02	471.3
Grey scale	100	101	102	103	104	105	106	107	108	109
											E	486.07	500.93	512.15	526.48	539.97	554.67	574.43	583.39	601.36	616.15
Grey scale	110	111	112	113	114	115	116	117	118	119
											E	630.61	651.82	661.81	681.34	698.01	717.73	729.26	747.37	765.54	784.45
Grey scale	120	121	122	123	124	125	126	127	128	129
											E	806.16	814.76	833.28	855.87	873.64	896.19	908.52	934.22	950.23	973.16
Grey scale	130	131	132	133	134	135	136	137	138	139
											E	993.82	1011.6	1042.3	1071.8	1071	1091.4	1122.9	1143.3	1171.4	1194
Grey scale	140	141	142	143	144	145	146	147	148	149
											E	1223.7	1243.9	1249.4	1286.7	1306.2	1329.5	1369.8	1375.8	1403.2	1437.2
Grey scale	150	151	152	153	154	155	156	157	158	159
											E	1465.6	1493	1521.2	1538.6	1568	1614.1	1635.5	1646.8	1715.6	1689.5
Grey scale	160	161	162	163	164	165	166	167	168	169
											E	1741.3	1773.4	1785.6	1814	1858.2	1888.5	1921.9	1953	1999.1	1995.9
Grey scale	170	171	172	173	174	175	176	177	178	179
											E	2066.4	2024.6	2101.3	2101.5	2180.6	2228	2280.1	2239.1	2359.5	2360.2
Grey scale	180	181	182	183	184	185	186	187	188	189
											E	2394.4	2389	2437.3	2525.4	2544.2	2529	2589.2	2629.7	2666.8	2701.5
Grey scale	190	191	192	193	194	195	196	197	198	199
											E	2740.6	2775.7	2821	2863.8	2885.1	2905.7	2976.8	3059.5	3017.6	3138.9
Grey scale	200	201	202	203	204	205	206	207	208	209
											E	3122.6	3204	3299.1	3253.7	3236.6	3363	3298.6	3517.1	3484.2	3615.2
Grey scale	210	211	212	213	214	215	216	217	218	219
											E	3570.6	3640.5	3684.7	3792.2	3804.8	3694	3906.7	3789.8	3993.2	4001.6
Grey scale	220	221	222	223	224	225	226	227	228	229
											E	4025.7	4114.1	4149.5	4116	4253.7	4261.7	4319	4334	4449.1	4431.7
Grey scale	230	231	232	233	234	235	236	237	238	239
											E	4472.2	4478.2	4566.5	4678.1	4717	4759.8	4828.8	4852.3	4909.1	4958.5
Grey scale	240	241	242	243	244	245	246	247	248	249
											E	5020.2	5057.3	5120	5170.6	5220.7	5258.4	5310.2	5367.4	5421.6	5476.5
Grey scale	250	251	252	253	254	255
											E	5525.1	5576.1	5639.1	5688.7	5735.8	5821.7

In particular embodiments, step 102 may include: the dimming grayscale of the LED lamp varies from 1 to 90 according to a time preset threshold, for example, the time threshold may be 2 seconds, and the LED lamp increases one grayscale every 2 seconds, and the photodetection device measures the luminance data of the LED lamp synchronously at intervals of the same time preset threshold, for example, when the grayscale is 1, the luminance data is 47.6, and when the grayscale is 90, the luminance data is 16775, so as to obtain a low-luminance dimming curve S2{ Ed1, Ed2 … …, Ed89, Ed90}, as shown in table 2, the low-luminance dimming curve of this embodiment is as follows.

TABLE 2 Low Brightness dimming Curve

Grey scale	1	2	3	4	5	6	7	8	9	10
											E	47.6	55.1	62.7	74.1	82.6	96.5	103.0	114.0	124.8	139.9
Grey scale	11	12	13	14	15	16	17	18	19	20
											E	151.9	165.9	187.6	206.5	226.2	250.6	277.2	311.3	346.1	389.3
Grey scale	21	22	23	24	25	26	27	28	29	30
											E	436.3	480.4	539.2	601.4	671.0	741.8	813.7	916.9	1003.2	1111.3
Grey scale	31	32	33	34	35	36	37	38	39	40
											E	1240.2	1349.3	1516.4	1676.5	1818.7	2006.7	2136.1	2348.0	2468.9	2509.7
Grey scale	41	42	43	44	45	46	47	48	49	50
											E	2725.8	2827.1	2834.2	3114.0	3293.5	3376.0	3546.9	3750.8	4038.2	3735.7
Grey scale	51	52	53	54	55	56	57	58	59	60
											E	3978.7	4549.8	4627.2	4915.5	4858.8	5060.7	5300.5	5521.2	5705.7	5929.2
Grey scale	61	62	63	64	65	66	67	68	69	70
											E	6198.4	6480.6	6771.4	7034.9	7316.7	7544.6	7804.9	8047.0	8337.8	8626.5
Grey scale	71	72	73	74	75	76	77	78	79	80
											E	9008	9444	9720	10041	10377	10670	11134	11558	11913	12238
Grey scale	81	82	83	84	85	86	87	88	89	90
											E	12607	13086	13549	13975	14300	14780	15422	15784	16156	16775

In particular embodiments, step 103 may include: the high luminance data of the gray scale 90 in table 1 is 365.79, the low luminance data of the gray scale 90 in table 2 is 16775, the luminance ratio of the gray scale 90 is calculated as shown in formula (1),

K＝E90/Ed90＝365.79/16775＝0.0218 (1)

where E90 is the high brightness dimming curve for grayscale 90 and Ed90 is the low brightness dimming curve for grayscale 90. And multiplying the low-brightness dimming curve by the brightness ratio K to obtain a corrected low-brightness dimming curve { Ed1 xK, Ed2 xK … …, Ed89 xK, E90 }.

In particular embodiments, step 104 may include: luminance data of gradations from 0 to 255 is obtained from the low luminance data 0 of the gradation 0 in combination with the high luminance dimming curve S1 and the corrected low luminance dimming curve, thereby determining dimming curves S {0, Ed1 × K, Ed2 × K … …, Ed89 × K, E90, … …, E254, E255 }. As shown in table 3, the dimming curve of the present embodiment is as follows.

TABLE 3 dimming Curve

In an embodiment, the dimming curves with high brightness S1{ E90, E91 … …, E254, E255} and the dimming curves with low brightness S2{ Ed1, Ed2 … …, Ed89, Ed90} are saved to the terminal, for example, in a table form to the computer for being called and corrected at any time.

Fig. 2 is a schematic structural diagram of a dimming curve testing apparatus according to an embodiment of the present invention, and as shown in fig. 2, the dimming curve testing apparatus 2 according to the embodiment includes: high brightness dimming test module 21, low brightness dimming test module 22, correction module 23, and fitting module 24.

The high-brightness dimming test module 21 is used for testing brightness data with the gray scale from 90 to 255 to obtain a high-brightness dimming curve;

the low-brightness dimming test module 22 is used for testing brightness data with the gray scale from 1 to 90 to obtain a low-brightness dimming curve;

the correction module 23 is configured to calculate a luminance ratio of the gray scale 90, and multiply the low-luminance curve by the luminance ratio to obtain a corrected low-luminance dimming curve;

and a fitting module 24 for fitting the high brightness dimming curve and the corrected low brightness dimming curve to determine the dimming curve.

Because the device is based on the testing method, the working principle of the device is the same as that of the testing method, and the details are not repeated here.

Fig. 3 is a schematic structural diagram of a high brightness dimming curve testing apparatus according to an embodiment of the present invention, and as shown in fig. 3, the high brightness dimming curve testing apparatus 3 according to the embodiment includes: LED lamp 31, photoelectric detection equipment 32 and computer 33.

In a specific embodiment, the computer 33 includes an LED lamp control program and a detection device control program, the LED lamp control program is used to control the LED lamp 31, the detection device control program is used to control the photoelectric detection device 32, the LED lamp control program and the detection device control program may be stored in a memory of the computer 33, and the computer 33 may also be replaced with a single chip microcomputer for storing the LED lamp control program and the detection device control program.

The LED lamp control program controls the LED lamp 31 to change the gray scale from 90 to 255 according to a preset time threshold, where the preset time threshold may preferably be 2 seconds, and the LED lamp 31 increases 1 gray scale every 2 seconds, for example, the LED lamp control program controls the gray scale of the LED lamp 31 to be 90 seconds, and controls the gray scale of the LED lamp 31 to be 91 seconds later until the gray scale increases to 255 seconds.

The detection device control program controls the photodetection device 32 to test the brightness data of the LED lamp 31 at the same time interval and preset threshold, for example, the detection device control program controls the photodetection device 32 to test the brightness data of 265.79 when the gray scale 90 is tested, the brightness data of 378.41 when the gray scale 91 is tested after 2 seconds, and the brightness data of 5821.7 until the gray scale is 255, so as to obtain the brightness dimming curve S1{ E90, E91 … …, E254, E255 }.

Fig. 4 is a schematic structural diagram of a low brightness dimming curve testing apparatus according to an embodiment of the present invention, and as shown in fig. 4, the high brightness dimming curve testing apparatus 4 of the present embodiment includes: an LED lamp 41, a photoelectric detection device 42, a computer 43 and a condenser lens 44.

In a specific embodiment, the computer 43 includes an LED lamp control program and a detection device control program, the LED lamp control program is used for controlling the LED lamp 41, the detection device control program is used for controlling the photoelectric detection device 42, the LED lamp control program and the detection device control program may be stored in a memory of the computer 43, and the computer 43 may also be replaced by a single chip microcomputer for storing the LED lamp control program and the detection device control program.

The LED lamp control program controls the LED lamp 41 to change the gray scale from 1 to 90 according to a preset time threshold, where the preset time threshold may preferably be 2 seconds, and the LED lamp 41 increases 1 gray scale every 2 seconds, for example, the LED lamp control program controls the gray scale of the LED lamp 41 to be 1, and controls the gray scale of the LED lamp 41 to be 2 after 2 seconds until the gray scale increases to 90.

The inspection device control program controls the photodetection device 42 to test the brightness data of the LED lamp 41 at the same time interval by presetting a threshold, for example, the inspection device control program controls the photodetection device 42 to test the brightness data of 47.6 when the gray scale 1 is tested, the brightness data of 55.1 when the gray scale 2 is tested after 2 seconds, and the brightness data of 16775 until the gray scale is 90, thereby obtaining the low-brightness dimming curve S2{ Ed1, Ed2 … …, Ed89, Ed90 }.

The condenser lens 44 is located at the light exit of the LED lamp 41 to further condense the light of the LED lamp 41, and the probe of the photoelectric detection device 42 is located at the focus point of the condenser lens 44 to test the luminance data at the focus point, thereby avoiding the problem of low accuracy of the low luminance data.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

Those of ordinary skill in the art will understand that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.

Claims

1. A dimming curve testing method is characterized by comprising the following steps:

and fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine a dimming curve.

2. The test method of claim 1, further comprising:

the gray scale is changed according to a time preset threshold value.

3. The test method as claimed in claim 1, wherein the luminance ratio K-E90/Ed 90 of the gray scale 90,

where E90 is a high-luminance dimming curve of the gradation 90, and Ed90 is a low-luminance dimming curve of the gradation 90.

4. The test method of claim 1, further comprising:

and storing the high-brightness dimming curve and the low-brightness dimming curve to a terminal.

5. The method of claim 1, wherein fitting the high-intensity dimming curve and the corrected low-intensity dimming curve to determine a dimming curve comprises:

according to the low-brightness data of the gray scale 0, combining the high-brightness dimming curve and the corrected low-brightness dimming curve to obtain the brightness data of the gray scale from 0 to 255;

and determining a dimming curve according to the brightness data of the gray scales from 0 to 255.

6. A dimming curve testing apparatus, comprising:

and the fitting module is used for fitting the high-brightness dimming curve and the corrected low-brightness dimming curve to determine a dimming curve.

7. The test apparatus of claim 6, wherein the hi-lite dimming test module comprises: the LED lamp comprises an LED lamp, photoelectric detection equipment and a computer;

the computer comprises an LED lamp control program and a detection equipment control program;

the LED lamp control program controls the LED lamp to change the gray scale from 90 to 255 according to a time preset threshold;

and the detection equipment control program controls the photoelectric detection equipment to test brightness data at intervals of the time preset threshold.

8. The test apparatus of claim 6, wherein the low brightness dimming test module comprises: the system comprises an LED lamp, photoelectric detection equipment, a computer and a condenser;

the LED lamp control program controls the LED lamp to change the gray scale from 1 to 90 according to a time preset threshold;

9. The test equipment as claimed in claim 8, wherein the condenser lens is located at the light exit of the LED lamp, and the probe of the photodetection equipment is located at the focus point of the condenser lens.

10. Test device according to any of claims 7-8, characterized in that said preset threshold of time comprises 2 seconds.