Liquid crystal apparatus having light quantity of the backlight in synchronism with writing signals

A liquid crystal apparatus, comprising:

• a liquid crystal panel comprising a matrix electrode arrangement including scanning signal lines and information signal lines defining picture elements, and a ferroelectric liquid crystal material interposed between the scanning signal lines and the information signal lines;
• an illumination source periodically changing the light quantity emitted therefrom between a maximum and a minimum value;
• and
• means for sequentially applying a selection scanning signal to said scanning lines in phase with information signals in a writing period when the light quantity assumes the minimum value to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the maximum value when both the selection scanning signal and the information signal are not applied to the signal lines.

A liquid crystal apparatus comprising:

• a ferroelectric liquid crystal panel of a transmission type matrix arrangement provided with scanning signal lines and information signal lines;
• a backlight disposed behind the panel changing its output light quantity with the lapse of time;
• and
• means for sequentially applying a selection scanning signal to said scanning lines in phase with information signals in a writing period when the light quantity assumes the minimum value to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the maximum value when both the selection scanning signal and the information signal are not applied to the signal lines.

A liquid crystal apparatus comprising:

• a ferroelectric liquid crystal panel of a transmission type matrix arrangement provided with scanning signal lines and information signal lines;
• a backlight disposed behind the panel changing its output light quantity with the lapse of time;
• and
• means for sequentially applying a selection scanning signal to said scanning lines in phase with information signals in a writing period when the light quantity assumes the minimum value to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the maximum value when both the selection scanning signal and the information signal are not applied to the signal lines, wherein the average light quantity in the writing period is 30%, or below, of the maximum value.

A liquid crystal apparatus comprising:

• a ferroelectric liquid crystal panel of a transmission type matrix arrangement provided with scanning signal lines and information signal lines;
• a backlight disposed behind the panel changing its output light quantity with the lapse of time;
• and
• means for sequentially applying a selection scanning signal to said scanning lines in phase with information signals in a writing period when the light quantity assumes the minimum value to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the maximum value when both the selection scanning signal and the information signal are not applied to the signal lines, wherein the average light quantity in the writing period is 30%, or below, of the maximum value.

A liquid crystal apparatus comprising:

• a ferroelectric liquid crystal panel of a transmission type matrix arrangement provided with scanning signal lines and information signal lines;
• a backlight disposed behind the panel changing its output light quantity with the lapse of time;
• and
• means for sequentially applying a selection scanning signal to said scanning lines in phase with information signals in a writing period when the light quantity assumes the minimum value to provide a writing voltage signal of one or the other polarity exceeding a threshold of the ferroelectric liquid crystal, a nonwriting voltage not exceeding the threshold being applied in a nonwriting period when at least one of the selection scanning signal and the information signal is not applied to the signal lines, and wherein the light quantity assumes the maximum value when both the selection scanning signal and the information signal are not applied to the signal lines, wherein the average light quantity in the nonwriting is 70%, or above, of the maximum value.