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Generic Control by CPU
Twenty-First Century microprocessors are fast enough to
control a Kyocera LCD, in addition to executing a limited application program of the device. Systems like this can achieve the lowest manufacturing cost by eliminating the IC or FPGA dedicated to controlling the LCD.
An LCD can easily be destroyed if the liquid crystal drive voltage is allowed to stay too long with the same polarity. The polarity must be reversed between 300 and 800 times per second.
The customer is responsible for this on 2.5, 3.8 and 4.3 inch Legacy STN LCDs and other LCDs with a DF signal. Larger legacy LCDs and V-series LCDs
handle this polarity change internally by counting the LOAD pulses, so there is still a real-time requirement on the system
to display rows in a timely manner in order to prevent LCD damage.
Such systems must have real time clock interrupts often enough to meet the required frequencies on the CP and LOAD signals. Their software must be developed on a simulator, so that real LCDs are not destroyed by software errors.
If you have real time LCD control software available for Kyocera LCD customers, please contact Kyocera Industrial Ceramics to have your product listed here.
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