This study aims to optimize the picture size and interpreting speed of sign language in news broadcasts to enhance comprehension and satisfaction among deaf viewers, while considering the impact on hearing audiences. We conducted an experiment with equal numbers of deaf and hearing participants who watched news clips featuring varying sign language overlay sizes and interpreting speeds. The results indicate that larger sign language windows and moderately slowed interpreting speeds significantly improve both comprehension and satisfaction for deaf viewers. In contrast, hearing viewers’ comprehension remained unaffected, but their satisfaction decreased with larger sign language overlays. This research provides empirical evidence and practical guidelines for broadcasters to adjust sign language presentations, enhancing accessibility for the deaf community without compromising the viewing experience for hearing audiences.