Chip-on-glass LCD drivers target vertical alignment displays

Vertical alignment displays typically require a higher LCD supply voltage and higher frame frequency than twisted nematic displays. The chip-on-glass drivers allow an LCD voltage up to 16V with accurate software-programmable temperature compensation for high and stable contrast, allowing them to be used for conventional twisted nematic displays with any backlight colour, as well as the vertical alignment displays. An on-chip oscillator with calibrated and programmable frame frequency of 45-360Hz is also provided.

AEC-Q100 qualified, the PCA8539 is a single-chip LCD driver generating drive signals for any static or multiplexed LCD with up to 18 backplanes, 100 segments and graphics of up to 1,800 display elements. It is suited for harsh environments including automotive applications such as climate control units, instrument clusters and infotainment systems. The driver is also optimised to drive displays up to 7” and simplified Chinese and Japanese characters.

Driving up to two lines by 20 characters with an additional 200 icons, the PCA2117 is a single-chip LCD character driver. AEC-Q100 grade 2 complaint, the driver includes an integrated character generator RAM that can store up to 48 user-defined characters.

Grahame Cooney, General Manager, NXP Semiconductors, commented: “By designing chip-on-glass LCD segment drivers specifically with vertical alignment displays in mind, we have been able to address the requirements of major display module manufacturers and automotive Tier 1 suppliers while also making it easier for non-automotive OEMs to incorporate VA displays into their designs."