Display element and gray scale driving method thereof

A display element, provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines, comprising:

• an optical modulation element;
• an active element;
• control means for (i) dividing sub fields with great weights into a plurality of divided sub fields, (ii) providing the divided sub fields in a first half and a second half of one field period respectively, and (iii) conducting scannings;
• first storage means for storing gray scale signal information corresponding to the sub fields with the great weights;
• and
• second storage means for storing gray scale signal information except the gray scale signal information corresponding to the sub fields with the great weights.

A gray scale driving method of a display element which is provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines and includes an optical modulation element and an active element, comprising the steps of:

• (i) dividing sub fields, which are for scanning gray scale information corresponding to significant bits among supplied gray scale signal information, into a plurality of divided sub fields, so as to provide the divided sub fields in a first half and a second half of one field period respectively;
• (ii) storing the gray scale signal information corresponding to the significant bits in first storage means, and storing gray scale information, except the gray scale signal information corresponding to the significant bits, in second storage means;
• (iii) outputting the gray scale signal information stored in the second storage means to the optical modulation element, so as to carry out a display;
• and
• (iv) outputting the gray scale signal information corresponding to the significant bits, the information stored in the first storage means, to the optical modulation element, so as to carry out a display.

A display element, provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines, comprising:

• an optical modulation element;
• an active element;
• and
• storage means for storing M-bit (M≧1) information, wherein, (i) when scanning is carried out K times (K≧1) at a predetermined intervals in one field period, in each scanning, the storage means stores M-bit (M≧1) gray scale signal information at a maximum, which is extracted from image information, (ii) until a subsequent scanning is carried out, the optical modulation element keeps a display with M-bit gray scale level, based on the gray scale signal information stored in the storage means, and (iii) a sub field with a greatest weight is divided into a plurality of divided sub fields, the divided sub fields are provided in a first half and a second half of one field period respectively, and scannings are carried out.

A display element, provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines, comprising:

• an optical modulation element;
• an active element;
• storage means for storing M-bit (M≧1) information at a maximum, when a scanning is carried out at least once at predetermined intervals in one field period;
• and
• gray scale display keeping means for making the optical modulation element keep a display with 2M-level gray scale based on gray scale signal information stored in the storage means, until a subsequent scanning is carried out.

A display element, provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines, comprising:

• an optical modulation element;
• an active element;
• control means for (i) dividing sub fields with great weights into a plurality of divided sub fields, (ii) providing the divided sub fields equally in a first half and a second half of one field period respectively, and (iii) conducting scannings;
• first storage means for storing gray scale signal information corresponding to the sub fields with the great weights;
• and
• second storage means for storing gray scale signal information except the gray scale signal information corresponding to the sub fields with the great weights.

A gray scale driving method of a display element which is provided at each point of intersections of a plurality of signal lines and a plurality of scanning lines and includes an optical modulation element and an active element, comprising the steps of:

• (i) dividing sub fields, which are for scanning gray scale information corresponding to significant bits among supplied gray scale signal information, into a plurality of divided sub fields, so as to equally provide the divided sub fields in a first half and a second half of one field period respectively;
• (ii) storing the gray scale signal information corresponding to the significant bits in first storage means, and storing gray scale information, except the gray scale signal information corresponding to the significant bits, in second storage means;
• (iii) outputting the gray scale signal information stored in the second storage means to the optical modulation element, so as to carry out a display;
• and
• (iv) outputting the gray scale signal information corresponding to the significant bits, the information stored in the first storage means, to the optical modulation element, so as to carry out a display.