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DLPDLCR4710EVM-G2: Defects in the continuity of the light intensity at different LED current values

Part Number: DLPDLCR4710EVM-G2

Hi,

We have suffered the discontinuity of the light intensity on the DLP4710EVM. Here's the question I asked two month ago.DLPDLCR4710EVM-G2: Defects in the continuity of the light intensity - DLP products forum - DLP®︎ products - TI E2E support forums. Due to the calibration of the Thorlab's optical power and energy meter, it took us a long time to retest the issue.

We have changed the current level range from 2000mA to 9500mA, selecting four specific current values as 2000mA, 5000mA, 8000mA and 9500mA, we still find that the same defects with the continuity of the light intensity when the blue channel is around 188.

Here's the data when the blue LED current is 9500mA (out of 16000mA).

TI_E2E_v2.txt
"Gray Scale"	"Radiometric (W/m^2,455nm,cal)"
0	0.119305936
1	0.12025031
2	0.12025031
3	0.094437416
4	0.12025031
5	0.156766111
6	0.166209853
7	0.170616932
8	0.179745882
9	0.197688991
10	0.216261683
11	0.239241455
12	0.261591643
13	0.288978494
14	0.320772424
15	0.353195937
16	0.389082155
17	0.425283165
18	0.466206045
19	0.511221214
20	0.556865965
21	0.602510716
22	0.651618173
23	0.711428536
24	0.768090986
25	0.82790135
26	0.894007541
27	0.956965819
28	1.02307201
29	1.098621943
30	1.171023962
31	1.243425981
32	1.309532173
33	1.391377934
34	1.479519522
35	1.567661111
36	1.665246441
37	1.759683857
38	1.860417101
39	1.967446173
40	2.071327331
41	2.175208489
42	2.282237561
43	2.382970805
44	2.483704049
45	2.562401896
46	2.647395571
47	2.798495437
48	2.987370269
49	3.169949274
50	3.352528279
51	3.513071887
52	3.667319667
53	3.812123705
54	3.93804026
55	4.004146452
56	4.045069332
57	4.089140126
58	4.208760854
59	4.388191945
60	4.567623036
61	4.743906213
62	4.923337304
63	5.112212136
64	5.257016175
65	5.386080644
66	5.57810339
67	5.933817658
68	6.547660864
69	6.736535697
70	6.956889668
71	7.145764501
72	7.334639333
73	7.523514166
74	7.743868137
75	7.964222109
76	8.216055219
77	8.467888329
78	8.688242301
79	8.908596272
80	9.191908521
81	9.443741631
82	9.695574741
83	9.97888699
84	10.2307201
85	10.48255321
86	10.76586546
87	11.01769857
88	11.30101082
89	11.58432307
90	11.86763532
91	12.15094757
92	12.43425981
93	12.7490512
94	13.09532173
95	13.37863398
96	13.63046709
97	13.91377934
98	14.22857072
99	14.54336211
100	14.8581535
101	15.20442403
102	15.51921541
103	15.86548594
104	16.21175647
105	16.55802699
106	16.90429752
107	17.25056805
108	17.59683857
109	17.97458824
110	18.3523379
111	18.69860843
112	19.17079551
113	19.61150345
114	19.8948157
115	20.17812795
116	20.55587762
117	20.96510642
118	21.37433522
119	21.75208489
120	22.19279283
121	22.5705425
122	23.01125044
123	23.38900011
124	23.79822891
125	24.23893685
126	23.70379149
127	25.0888736
128	25.56106068
129	26.00176862
130	26.47395571
131	26.91466365
132	27.44980901
133	27.85903781
134	28.29974575
135	28.77193284
136	29.24411992
137	29.77926528
138	30.18849408
139	30.66068116
140	31.16434738
141	31.63653446
142	32.14020068
143	32.6438669
144	33.14753312
145	33.65119935
146	34.09190729
147	34.65853179
148	35.16219801
149	35.69734337
150	36.23248872
151	36.76763408
152	37.2713003
153	37.80644566
154	38.37307016
155	38.93969466
156	39.56927743
157	39.9470271
158	40.45069332
159	41.01731782
160	41.58394232
161	42.21352509
162	42.81162873
163	43.4412115
164	44.007836
165	44.5744605
166	45.17256413
167	45.80214691
168	46.43172969
169	46.96687504
170	47.56497868
171	48.16308232
172	48.72970682
173	49.39076873
174	50.02035151
175	50.68141342
176	51.3109962
177	51.94057897
178	52.63312002
179	53.2627028
180	53.86080644
181	54.52186835
182	55.18293026
183	55.87547132
184	56.53653323
185	57.19759515
186	57.8901362
187	58.17344845
188	56.3476584
189	56.47357495
190	58.04753189
191	58.99190606
192	59.59000969
193	60.31402988
194	61.03805008
195	61.79354941
196	62.58052787
197	63.27306893
198	64.21744309
199	64.84702587
200	65.47660864
201	66.10619142
202	67.05056558
203	67.68014836
204	68.62452252
205	69.25410529
206	70.19847946
207	70.82806223
208	71.7724364
209	72.40201917
210	73.03160195
211	73.97597611
212	74.92035027
213	75.54993305
214	76.49430721
215	77.12388999
216	78.38305554
217	79.3274297
218	79.95701248
219	80.58659525
220	81.53096941
221	82.47534358
222	83.41971774
223	84.04930052
224	84.67888329
225	84.3640919
226	84.3640919
227	85.30846607
228	85.93804884
229	86.88242301
230	87.82679717
231	88.77117133
232	89.71554549
233	90.65991966
234	91.28950243
235	92.2338766
236	93.17825076
237	93.80783353
238	95.06699909
239	95.69658186
240	96.95574741
241	97.90012157
242	98.52970435
243	99.47407851
244	100.4184527
245	101.6776182
246	102.6219924
247	103.5663666
248	104.5107407
249	105.4551149
250	106.399489
251	107.3438632
252	108.2882374
253	109.2326115
254	110.4917771
255	110.4917771

Does this mean our DLP device has got a hardware issue when the external video offers blue channel a value at 188?

Any hints would be appreciate.

Regards,

Li

  • Hello Li,

    Can you please let us know if you are seeing the same behavior by displaying internal source ramp instead of external source (TPG color ramps). Also, please let us know if this discontinuity is color dependent/independent. 

    Regards,

    Mayank

  • Hello Mayank,

    When I display the internal color ramp patterns, we can see the black line around 188 from the camera.

    And we test the red and green channels at LED current value 6000mA, it seems that they won't decrease when we increase the channel value, which means no defects as blue channel. But there are two platforms around channel value 220 and 240. By the way there's a platform around 225 for blue channel. These platform is hard to figure out by the camera.

    Here's the lux meter data for green channel.

    TI_E2E_v3.txt
    Green channel	lux meter(lux)
    0	2.71000000000000
    1	2.71000000000000
    2	2.71000000000000
    3	2.71000000000000
    4	3.05000000000000
    5	3.13000000000000
    6	3.18000000000000
    7	3.26000000000000
    8	3.35000000000000
    9	3.56000000000000
    10	3.77000000000000
    11	4.03000000000000
    12	4.33000000000000
    13	4.63000000000000
    14	4.97000000000000
    15	5.31000000000000
    16	5.73000000000000
    17	6.12000000000000
    18	6.62000000000000
    19	7.09000000000000
    20	7.60000000000000
    21	8.12000000000000
    22	8.73000000000000
    23	9.32000000000000
    24	9.93000000000000
    25	10.5900000000000
    26	11.1400000000000
    27	12.0800000000000
    28	12.8600000000000
    29	13.4300000000000
    30	14.5400000000000
    31	15.4300000000000
    32	16.3600000000000
    33	17.3400000000000
    34	18.3200000000000
    35	19.3200000000000
    36	20.3000000000000
    37	21.4000000000000
    38	22.5000000000000
    39	23.7000000000000
    40	24.9000000000000
    41	26.3000000000000
    42	27.5000000000000
    43	29
    44	30.7000000000000
    45	32.1000000000000
    46	33.4000000000000
    47	34.8000000000000
    48	36.4000000000000
    49	37.9000000000000
    50	39.5000000000000
    51	41.2000000000000
    52	42.8000000000000
    53	44.4000000000000
    54	46.2000000000000
    55	48.1000000000000
    56	50
    57	51.9000000000000
    58	53.6000000000000
    59	55.4000000000000
    60	57.4000000000000
    61	59.5000000000000
    62	61.6000000000000
    63	63.8000000000000
    64	65.8000000000000
    65	68
    66	70.2000000000000
    67	72.4000000000000
    68	74.8000000000000
    69	77.1000000000000
    70	79.6000000000000
    71	82.2000000000000
    72	84.6000000000000
    73	86.8000000000000
    74	89.1000000000000
    75	92
    76	94.6000000000000
    77	97.1000000000000
    78	99.6000000000000
    79	102.600000000000
    80	105.400000000000
    81	108.100000000000
    82	111
    83	114
    84	116.800000000000
    85	119.900000000000
    86	123.200000000000
    87	126.400000000000
    88	129.100000000000
    89	131.900000000000
    90	135.200000000000
    91	138.400000000000
    92	141.700000000000
    93	145.400000000000
    94	148.800000000000
    95	151.900000000000
    96	155.500000000000
    97	159
    98	162.200000000000
    99	165.900000000000
    100	169.500000000000
    101	173
    102	176.900000000000
    103	180.600000000000
    104	184.700000000000
    105	189.300000000000
    106	193.300000000000
    107	195.900000000000
    108	198.400000000000
    109	203
    110	207
    111	211
    112	216
    113	220
    114	224
    115	228
    116	233
    117	237
    118	241
    119	246
    120	251
    121	255
    122	260
    123	264
    124	270
    125	274
    126	279
    127	284
    128	289
    129	294
    130	299
    131	304
    132	311
    133	316
    134	321
    135	326
    136	331
    137	337
    138	342
    139	347
    140	353
    141	358
    142	364
    143	370
    144	376
    145	381
    146	385
    147	391
    148	397
    149	403
    150	409
    151	415
    152	421
    153	427
    154	433
    155	439
    156	445
    157	452
    158	458
    159	464
    160	471
    161	477
    162	484
    163	491
    164	498
    165	504
    166	511
    167	518
    168	524
    169	531
    170	538
    171	545
    172	551
    173	559
    174	566
    175	571
    176	578
    177	585
    178	593
    179	601
    180	608
    181	616
    182	623
    183	631
    184	638
    185	646
    186	653
    187	662
    188	669
    189	677
    190	685
    191	693
    192	701
    193	710
    194	717
    195	725
    196	734
    197	743
    198	751
    199	757
    200	765
    201	774
    202	783
    203	791
    204	800
    205	808
    206	817
    207	826
    208	834
    209	843
    210	853
    211	862
    212	871
    213	880
    214	889
    215	898
    216	910
    217	919
    218	927
    219	929
    220	934
    221	944
    222	953
    223	963
    224	972
    225	982
    226	992
    227	1002
    228	1012
    229	1023
    230	1032
    231	1043
    232	1052
    233	1063
    234	1072
    235	1082
    236	1092
    237	1102
    238	1103
    239	1111
    240	1121
    241	1132
    242	1143
    243	1154
    244	1164
    245	1176
    246	1187
    247	1197
    248	1208
    249	1219
    250	1230
    251	1241
    252	1252
    253	1263
    254	1273
    255	1275

    Regards,

    Li

  • Li,

    Thanks for elaborating. What firmware build are you using with this EVM?

    Regards,
    Philippe

  • Hello, Philippe

    Currently, the EVM firmware is 1.6.0. The EVM software version is 1.5.1 and the DLPCrafter software version is 7.4.

    Regards,

    Li

  • Li,

    Thanks for the feedback. We will need to investigate this firmware and board to see if we can reproduce the issue and comment back on the same within the next few days.

    Regards,

    Philippe