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Braille Character Electrothermal Display Element

IP.com Disclosure Number: IPCOM000082211D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 3 page(s) / 58K

Publishing Venue

IBM

Related People

Gilliland, JW: AUTHOR

Abstract

This display device will reproduce any braille character by heating electronically selected combinations of a 2 x 3 array of radiators. A braille character is formed by generating a heat difference between selected and nonselected combinations of a 2 x 3 radiator matrix. The radiator heat difference is detected by the sense of touch, which is analogous to the sense that detects the raised dot pattern conventionally used in braille text.

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Braille Character Electrothermal Display Element

This display device will reproduce any braille character by heating electronically selected combinations of a 2 x 3 array of radiators. A braille character is formed by generating a heat difference between selected and nonselected combinations of a 2 x 3 radiator matrix. The radiator heat difference is detected by the sense of touch, which is analogous to the sense that detects the raised dot pattern conventionally used in braille text.

Each character dot pattern is contained in a six-radiator element chip 10 (of 8-12 shown). Any of the six elements 21-26 can be independently excited, by passing electric current through six corresponding heaters 28. The heater will rapidly rise to its operating temperature and will remain heated until the excitation current is disconnected. Heat conductive material 30 is affixed to each electric heater and extended above the chip to perform as a heat radiator.

The position of the six heat radiators on a chip corresponds to the positions of the six-dot braille code. Hence, selection of any combination of the six heaters will radiate heat from the corresponding set of radiators above the surface of the chip, to form a braille character of positions of the six-dot braille code. Hence, selection of any combination of the six heaters will radiate heat from the corresponding set of radiators above the surface of the chip, to form a braille character of a different temperature than the surrounding unheated surface.

The heat dissipated by internal chip elements is controlled by the user with a potentiometer 32 (Fig. 3) to adjust the power of the heating source.

One 2 x 3 heat radiator chip is one character module. The modules 8-12 are plugged into a board via electric contacts. The board can be built to accept any number of characters per line and any number of lines of characters.

With the proper attachment interface electronics, the board of braille electrothermal modules...