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在上面的原理图中,如果我将"VCC_backlight_阳 极"连接到 LCD 的阳极,并且 LCD 的阴极连接到"GND"("VCC_backlight_cathode"仍然为"无连接")。 会发生什么情况? LCD 是否工作? 在该配置中、我能否使用 PWM 控制亮度。