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Flashing Cursor in Passive Display Disclosure Number: IPCOM000039312D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue


Related People

Masters, BD Vaughton, MK [+details]


In a passive matrix display such as an electrochromic display, pels are either on or off as there is no brightness control. A flashing cursor is displayed by initially writing all the pels (picture elements) in the cursor box, then erasing all pels except those forming the character, and finally sequentially writing and erasing the latter pels to flash the cursor. Certain display technologies (e.g., electrochromics) rely on depositing or plating a material onto a surface which contrasts with the background. To display a character, the normal practice is to write onto the pels which form the character. Similarly, to display a reverse video character, then write all the pels except those forming the character. To remove the character, the whole character box is erased.