Driving method of driving a liquid crystal display element

Abstract

Abstract A driving method of a matrix type liquid crystal display element comprising at least J × L number (J and L are respectively integers of 2 or more) of row electrodes and a plural number of column electrodes wherein, the J × L number of row electrodes are divided into a J number of row electrode subgroups each comprising an L number of row electrodes so that the subgroups are selected as each batch to be driven; when voltages are applied to the row electrodes, either a voltage level of +V r or -V r (where V r > 0) is applied at a selection time, when a voltage at a non-selection time is 0 (zero); voltages applied to the column electrodes are selected from an (L + 1) number of voltage levels of V₀, V₁, ..., V L (where V₀ < V₁ < ... < V L ); and when a two-valued information of the j-th line electrode subgroup (j is an integer of any of 1 through J) in a specified column in the plural column electrodes is expressed by a column vector D j having an L number of elements (where the elements of the vector D j comprise 1 indicating ON and 0 indicating OFF), the following conditions are satisfied: (1) the j-th row electrode subgroup is selected by applying sequentially voltages so that the elements of a selection voltage vector which constitute a selection voltage matrix, as defined in the following items (a) and (b), correspond to voltages applied to the row electrodes constituting the j-th row electrode subgroups: (a) a matrix A=[α₁, α₂, ... α q , ..., α k ] (where α q is a column vector having an L number of elements) comprising L rows and K columns, which has an element of +V r or -V r and in which the product of a matrix and a transposed matrix of the same assumes a scalar multiple of the unit matrix is selected (where K is an integer having a relation of L ≦ 2 p = K and p is a natural number), and (b) as the selection voltage, matrix comprising selection voltage vectors which include at least each one of α₁, α₂, ..., α k , -α₁, -α₂, ..., -α k and are arranged in a matrix are selected, and, (2) when the j-th row electrode subgroup is selected under the above-condition (1), the voltage applied to the column electrodes to indicate a display information by means of the vector D j are determined as in the following items (a) and (b): (a) a vector β is formed by the selection voltages applied to the j-th row electrode subgroup where +V r represents 1 and -V r represents 0, and (b) a voltage V i (i is an integer of any of 0 through L) given by the sum of exclusive OR of the elements corresponding to the vectors β and D j is applied to the column electrodes.

Inventors

• 👤 Takeshi c/o AG Technology Co. Ltd. Kuwata
• 👤 Temkar N. c/o Asahi Glass Co. Ltd. Ruckmongathan
• 👤 Yutaka c/o AG Technology Co. Ltd. Nakagawa
• 👤 Hidemasa c/o AG Technology Co. Ltd. Koh
• 👤 Hiroshi c/o Asahi Glass Co. Ltd. Hasebe
• 👤 Takashi c/o Asahi Glass Co. Ltd. Yamashita
• 👤 Hideyuki c/o Asahi Glass Co. Ltd. Nagano
• 👤 Takanori c/o AG Technology Co. Ltd. Ohnishi

Bibliographic Details