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以测量仪表中常见的时分割驱动法驱动的段式LCD显示器为例,分析LCD显示器的电极连接结构和驱动信号波形;介绍单片机读取仪表LCD读数的接口电路。此接口电路应用于笔者开发的自动血压监控仪的研制及临床应用项目中,由8031单片机读取血压计的收缩压、舒张压、心率以及充气和放气时瞬时压强。实验证明,此接口电路工作稳定、可靠。
Taking the segment LCD driver driven by time-division driving method as an example, the connection structure and driving signal waveforms of the LCD display are analyzed. The interface circuit for reading the LCD reading from the microcontroller is introduced. This interface circuit used in the development of automatic blood pressure monitor developed by the author and clinical applications, read by the 8031 SCM sphygmomanometer systolic blood pressure, diastolic blood pressure, heart rate and inflatable and deflated when the instantaneous pressure. Experiments show that this interface circuit work stable and reliable.