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Flashing Cursor in Passive Display

IP.com Disclosure Number: IPCOM000039312D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Masters, BD: AUTHOR [+2]

Abstract

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.

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Flashing Cursor in Passive Display

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. These display technologies do not permit writing the pels of a character more than once, before erasing them. A prior method for displaying a flashing cursor is: (starting with a previously written character): 1.Erase the character in the cursor box. 2. Fully write the cursor box. (cursor displayed) 3. Erase the complete cursor box. 4.

Write the character in the cursor box. (character displayed) 5. Repeat from No. 1. This disclosure suggests that it is better only to write and erase the cursor pels in the cursor box. A particular example of this is the displaying of a flashing cursor over the top of a character. Now the sequence of events is (starting with a previou...