LCDs tester


Posted on Sep 27, 2012

An LCD requires an ac electric field to excite the organic compound in the display. Applying a dc voltage could permanently damage the LCD. The circuit in Figure 1 is a simple configuration to test the performance of an LCD. The circuit produces biphase square waves with negligible dc content. The circuit is based on a CD40106 hex Schmitt-trigger inverter.



The buffers and drivers connect to test probes through 47-k series resistors, which protect the IC in the event of short circuits. With the component values shown in Figure 1, oscillator IC1A provides a square-wave frequency of approximately 45




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