Apparatus for displaying lower case letters

Claim 1

In a matrix display device for displaying symbols in response to representations of those symbols, each symbol being in a first or second class, symbols in the first class being displayed in all the columns of a matrix and symbols in the second class being displayed in a submatrix which omits one column in the matrix, a display unit having a printing element, X and Y axis deflection circuits for positioning the printing element on the matrix and an unblanking circuit for enabling the printing element to make a visible mark, matrix storage means for storing unblanking information for each symbol at a set of addressed locations, each location storing unblanking information corresponding to a column of the matrix, and means responsive to the representation of a symbol for selecting locations in the matrix storage means for retrieving unblanking information, the improvement of control means for the display device comprising: A. means for generating a base signal to thereby energize the Y-axis deflection circuit to position the printing element with respect to a base position on the Y-axis, B. means for receiving certain unblanking information for the location in the matrix storage means corresponding to the omitted column in the second class of symbols to control the generation of an offset signal, C. means responsive to the receipt of the representations of symbols in the second class for disabling the unblanking circuit during the receipt of the certain unblanking information in the omitted column, and D. summing means connected to the Y axis deflection circuit and offset signal generating means for combining the offset and base signals thereby to control the vertical position of symbols in the second class in response to said offset signal.