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Display Feedback for Zero Displacement Panel Button

IP.com Disclosure Number: IPCOM000048277D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Holmes, LD: AUTHOR [+2]

Abstract

In terminal apparatus such as panels for impact printers, it has become customary to use zero displacement buttons, i.e., panel buttons which do not move. With such buttons it is important to notify the operator that the contact is being made. Otherwise, multiple operations may be requested by the operator due to natural electromechanical time delay, or the operator may push so hard as to damage the apparatus. The present approach provides such information through the existing display panel itself which happens to be a 7-segment display. The equipment does so by the simple expedient of illuminating the decimal points in the display whenever a button is being depressed and maintaining those decimal points in illuminated fashion until the button is released.

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Display Feedback for Zero Displacement Panel Button

In terminal apparatus such as panels for impact printers, it has become customary to use zero displacement buttons, i.e., panel buttons which do not move. With such buttons it is important to notify the operator that the contact is being made. Otherwise, multiple operations may be requested by the operator due to natural electromechanical time delay, or the operator may push so hard as to damage the apparatus. The present approach provides such information through the existing display panel itself which happens to be a 7-segment display. The equipment does so by the simple expedient of illuminating the decimal points in the display whenever a button is being depressed and maintaining those decimal points in illuminated fashion until the button is released. Thus, without any additional display apparatus visual feedback is provided.

The following represents an example of this expedient on the panel of an impact printer. Visual feedback has been added to the control panel buttons to indicate valid depressions. The decimal points of the two 7-segment displays are lit for the duration of the button depression.

These decimal points are also under processor control. The control logic is designed so that the buttons or the processor can activate the of the lights by means of pulse-width modulation. In this printer the decimal points are lit at low intensity, which gives a quick indication of the current mode of operatio...