Part Number:DLPC3478Other Parts Discussed in Thread:DLPA2005,
DLPC3478+DLPA2005+DMD3010
我们使用的是Internal patterns模式,有两个pattern set,其中set1包含12张1bit图片,set2包含1张1bit图片;
投影顺序为①以B光投影set1的12张图片,然后②以R光投影set2的1张图片,再③以G光投影set2的1张图片,最后④以B光投影set2的1张图片;
问题现象:投影帧率在1250hz上下,②原本应该投影R光的,非常容易没有投R光,而是B光
当设置前后沿为0.154ms,曝光为0.46ms时(投影帧率1300),非常容易出现上述问题;设置前后沿0.2ms,曝光0.4ms时(投影帧率1250),也会出现这个问题,但是出现频率会低一些;
想请问R光没有切换过来的原因是什么?以及有没有比较好的方式避免该问题?
best regards
Jeremy_Wu:
使用什么软件版本?
投影顺序为①以B光投影set1的12张图片,然后②以R光投影set2的1张图片
有没有问题?
确认没有超出规格曝光时间设置。1250HZ对应配置曝光时间多少?
Internal Pattern Mode Timings:
Pattern Type
Sequence Index
Exposure Time Range (us)
Sequence Min Pre-Exposure Dark Time (us)
Sequence Min Post-Exposure Dark Time (us)1-bit Monochrome
18
200 – 399
171
3117
400 – 799
171
3116
800 – 799
171
3115
1800 – 3799
171
3114
3800 – 7600
171
311-bit RGB
25
600 – 1799
171
3124
1800 – 3799
171
3123
3800 – 7600
171
318-bit Monochrome
20
3464 – 6928
171
3121*
1677 – 3463
171
318-bit RGB
22
10912 – 21824
171
31
*Sequence 21 is a special sequence that displays 7-bit patterns. The least significant bit of the 8-bit pattern data will be ignored.
Notes:
For internal patterns, there will be an additional variable delay of ~3000 us at the beginning of every pattern set.
Exposure times shorter than the above values are not possible. Longer exposure times will operate with decreased timing accuracy and behavior is not guaranteed.
Shorter dark times are not possible. Longer dark times can be used. The maximum possible dark times for a desired exposure time are:Tmax pre-exposure dark time = ( 27306us + tsequence min pre-exposure dark time ) * (Tdesired exposure / tsequence minimum exposure)
Tmax post-exposure dark time = ( 27306us + tsequence min post-exposure dark time ) * (Tdesired exposure / tsequence minimum exposure)
,
user6387491:
感谢回复!
投影顺序为①以B光投影set1的12张图片,然后②以R光投影set2的1张图片;在2上也会出错;
我们曝光前沿0.2ms,曝光时间0.4,曝光后沿0.2ms,每张图都是1bit单色(1 bit monochrome)(不同图片的颜色切换应该不算是RGB吧?)
曝光参数通过98h的指令写入;
图片序列设置98h指令执行一次,之后是不断以9Eh的指令去触发run once,偶发出现颜色切换异常
best regards
,
Jeremy_Wu:
你用TI GUI lightcrafter测试。再抓下I2C命令对比。
https://www.ti.com/lit/pdf/DLPU112
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