Navigation aid for refreshable braille display and other text products for the vision impaired
View Patent ↗A navigation aid for a refreshable Braille display and similar products for the visually impaired. A navigation wheel is located adjacent at least one end of the refreshable Braille display. Rotation of the wheel by an increment moves the displayed text forward or backward by a predetermined increment, such as by one word, or one line or one paragraph. In a preferred embodiment, the function performed by rotating the wheel can be changed by depressing the wheel. A separate navigation wheel may be located at opposite ends of the refreshable Braille display and the two navigation wheels may perform the same or different functions when rotated.
1. A refreshable Braille display, comprising:
a housing;
a plurality of refreshable Braille cells mounted in a row in said housing for reading by a user using a finger moving along said row of cells between opposite first and second ends of said row;
a first encoder mounted in said housing adjacent said first end of said row;
a first rotatable wheel associated with said first encoder for causing said first encoder to generate at least one pulse each time said first rotatable wheel is rotated a predetermined increment, and;
a programmable controller adapted to operate said Braille cells to display text and to scroll the displayed text by a predetermined amount in response to said at least one pulse when said first rotatable wheel is rotated trough said predetermined increment.
2. The refreshable Braille display of claim 1 , further comprising:
said first encoder adapted to produce two out-of-phase pulse signals as said first rotatable wheel is incrementally rotated, and
said programmable controller being adapted to scroll text displayed on said Braille cells in a first direction when said first rotatable wheel is rotated in a first direction and to scroll text displayed an said Braille cells in a second direction opposite to said first direction when said first rotatable wheel is rotated in said second direction.
3. The refreshable Braille display of claim 2 , further comprising:
said first rotatable wheel including a plurality of detents which are felt by a user each time said first rotatable wheel is rotated through a predetermined increment.
4. The refreshable Braille display of claim 3 , further comprising:
a second rotatable wheel and a second encoder mounted at said second end of said row of Braille cells.
5. The refreshable Braille display of claim 4 , further comprising:
said first and second rotatable wheels adapted to be depressed relative to a position of repose by a user exerting force thereagainst;
said first and second encoders including a first and second encoder switch, respectively, adapted to generate a pulse when actuated by depressing the rotatable wheel associated wit said encoder;
said programmable encoder adapted to change the increment in which text is scrolled in response to said pulse from either said first or second encoder switches.
6. The refreshable Braille display of claim 5 , further comprising:
said programmable controller being a notetaker including a program controlled computer having a memory,
a keyboard for entering text data into said memory.
7. A refreshable Braille display, comprising:
a plurality of Braille cells arranged in a row and adapted to display a line of text;
a first encoder located adjacent a first end of said row of cells;
a rotatable navigation wheel connected to said first encoder;
said first encoder adapted to generate control signals when said navigation wheel is rotated; and
a programmable controller adapted to display a first row of Braille characters in said row of Braille cells in response to receipt of a first control signal from said first encoder when said rotatable navigation wheel is in a first rotatable position; and
said programmable controller adapted to display a second row of Braille characters in said row of Braille cells in response to receipt of a second control signal from said first encoder when said rotatable navigation wheel is in a second rotatable position.
8. A refreshable Braille display according to claim 7 , further comprising:
said navigation wheel having a plurality of detents which are felt by a user when said rotatable navigation wheel is rotated through a predetermined increment;
said first encoder generating a predetermined control signal when said navigation wheel is rotated through said predetermined increment.
9. A refreshable Braille display according to claim 8 , further comprising:
said first encoder adapted to generate a first predetermined control signal when said navigation wheel is rotated in a first direction through a predetermined increment and a second predetermined control signal when said navigation wheel is rotated in a second direction opposite to said first direction through a predetermined increment.
10. A refreshable Braille display according to claim 7 , further comprising:
a second encoder located adjacent a second, opposite end of said row of cells;
a second rotatable navigation wheel connected to said second encoder;
said second encoder adapted to generate control signals when said navigation wheel is rotated;
said programmable controller being controlled by said control signals generated by said first encoder and said second encoders.
11. The refreshable Braille display according to claim 7 , further comprising:
said rotatable wheel adapted to be depressed from a position of repose when an external force is applied to it by a user;
said first encoder including a first encoder switch adapted to generate a first control signal when actuated by depressing the rotatable wheel associated wit said first encoder;
said programmable encoder adapted to change the increment in which text is scrolled in response to said control signal.