Product category:
Microprocessors, Microcontrollers and DSPs
News Release from: Hitachi Europe | Subject: HD66768
Edited by the Electronicstalk Editorial
Team on 19 November 2002
Controller drives passive colour LCDs
for mobiles
The HD66768 is a controller driver for passive colour liquid crystal display systems.
The HD66768 is a controller driver for passive colour liquid crystal display (LCD) systems The single-chip device supports a 104 x 84pixel screen size and 65,000 colours and offers high-quality, flicker-free display and realistic depiction of photographic images
This article was originally published on Electronicstalk on 16 Feb 2001 at 8.00am (UK)
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The device employs a 38um-pitch pad spacing that allows the use of ultra-fine chip on glass (COG) mounting, where the device is connected directly face-down on the LCD glass substrate.
The HD66768 uses a pulsewidth gradation method to improve panel responsivity to handle moving image displays.
This method does not depend on an afterimage, making it possible to eliminate flicker and achieve high image quality.
The controller driver also incorporates a liquid crystal drive power supply circuit that includes a reference voltage generation circuit.
This circuit is able to suppress any degradation of image quality by providing liquid crystal drive output signals at a stable reference voltage, and also makes it easy to handle the power supply specifications of different display systems.
The HD66768 also employs power supply circuit techniques that enable it to stabilize the output voltages from the liquid crystal drive power supply circuit with almost half the number of external capacitors, and so achieve a lower-priced system.
An EEPROM interface enables direct connection of external EEPROM to the HD66768, allowing register values to be saved.
Other variables such as adjustment values and liquid crystal drive voltage values, which differ according to the display system used, can be written to EEPROM beforehand and then set at system start-up, enabling screen display to be implemented easily and with the appropriate settings.
The pins inside the HD66768 are arranged so that common drivers are arrayed on both sides of the segment driver area.
This allows compact mounting through a central placement that enables balanced wiring on both sides of the LCD unit.
Sample shipments will begin in December 2002.
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