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DLP5530PGUQ1EVM: LED采用直流电源供电,黑色下有明显背景光

Part Number: DLP5530PGUQ1EVM

在使用DLP5530PGUQ1EVM时,led采用了直流电源供电(此时led处于常亮,不和dmd的驱动时序同步),此时DLP投影黑色画面时用规则的背景光,如下图,是否因为dmd的duty_cycle导致漏光。

另如显示黑色图,dmd的duty_cycle会导致on-off状态的切换吗?