Driving apparatus

• US 5,675,356 A
• Filed: 01/22/1996
• Issued: 10/07/1997
• Est. Priority Date: 10/28/1988
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ooki, Akiko, Tsuboyama, Akira, Inoue, Hiroshi
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Mengistu, Amare
• Application Number:
  US08/589,456
• Time in Patent Office: 624 Days
• Field of Search: 358/241, 345/55, 345/87, 345/94, 345/100, 345/101
• US Class Current: 345/101
• CPC Class Codes: G09G 2310/0227 related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
• CPC Class Codes: G09G 2310/0232 Special driving of display border areas
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 3/3629 using liquid crystals having memory effects, e.g. ferroelectric liquid crystals

Abstract

Disclosed is a driving apparatus comprising:

a. means for driving matrix electrodes having scanning and information electrodes;

b. means for counting the number of scanning electrodes to which a scanning selection signal is applied; and

c. means for designating a width of a scanning selection period for every predetermined count value.

Claims

1. A method for driving a matrix of a liquid crystal panel having matrix electrodes constituted by scanning electrodes and information electrodes arranged to cross the scanning electrodes, and a liquid crystal arranged in a space between the scanning electrodes and the information electrodes and having a switching speed varying according to an external temperature, said method comprising the steps of:

applying a scanning selection signal to the scanning electrodes with a skipping of two or more scanning electrodes during a single vertical scanning period; and

applying an information signal to the information electrodes synchronously with the scanning selection signal,

wherein;

the applying of the scanning selection signal to the scanning electrodes is performed so that a time for applying the scanning selection signal to a selected scanning electrode is made shorter as the external temperature increases, and, simultaneously, the number of skipping of the scanning selection signal during a single vertical scanning period decreases; and

the applying of the scanning selection signal to the scanning electrodes is performed so that a time for applying the scanning selection signal to the selected scanning electrode is made longer as the external temperature decreases, and, simultaneously, the number of skipping of the scanning selection signal during the single vertical scanning period increases.

2. A method according to claim 1, wherein said the liquid crystal is a chiral smectic liquid crystal.

3. A method for driving a matrix of a liquid crystal panel having matrix electrodes constituted by scanning electrodes and information electrodes arranged to cross the scanning electrodes, and a liquid crystal arranged in a space between the scanning electrodes and the information electrodes and having a memory function and a switching speed varying according to an external temperature, said method comprising the steps of:

applying a scanning selection signal to the scanning electrodes with a skipping of two or more scanning electrodes during a single vertical scanning period; and

applying an information signal to the information electrodes synchronously with the scanning selection signal,

wherein;

the applying of the scanning selection signal to the scanning electrodes is performed so that a time for applying the scanning selection signal to a selected scanning electrode is made shorter as the external temperature increases, and, simultaneously, the number of skipping of the scanning selection signal during a single vertical scanning period decreases; and

the applying of the scanning selection signal to the scanning electrodes is performed so that a time for applying the scanning selection signal to the selected scanning electrode is made longer as the external temperature decreases, and, simultaneously, the number of skipping of the scanning selection signal during the single vertical scanning period increases.

4. A method according to claim 3 wherein the liquid crystal is a chiral smectic liquid crystal.