Liquid crystal display element having opposite signal voltage input directions

• US 6,108,067 A
• Filed: 12/18/1996
• Issued: 08/22/2000
• Est. Priority Date: 12/27/1995
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), The secretary of state for defence in her Britannic Majesty's Government of the United Kingdom of Great Britain And Northern Ireland
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), The secretary of state for defence in her Britannic Majesty's Government of the United Kingdom of Great Britain And Northern Ireland
• Inventors: Okamoto, Shigetsugu
• Primary Examiner(s): Parker, Kenneth
• Assistant Examiner(s): NGO, HUYEN LE
• Application Number:
  US08/769,102
• Time in Patent Office: 1,343 Days
• Field of Search: 349/33, 349/139, 349/149, 349/147, 349/85, 349/151, 349/152, 257/59, 257/758
• US Class Current: 349/152
• CPC Class Codes: G02F 1/133382 Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals
• CPC Class Codes: G09G 2320/041 Temperature compensation

Abstract

A liquid crystal display element is arranged so that a scanning line electrode group and a signal line electrode group, which are formed by arranging a plurality of electrodes parallel, are placed in a direction where they intersect each other, and liquid crystal intervenes between these electrode groups, and input directions of signal voltages to be applied to the signal line electrode group are opposite in some electrode. As a result, nonuniformity of temperature on a display screen, which is caused by heat generation according to driving of the liquid crystal and causes variations of a driving property of the liquid crystal, is suppressed, and thus a satisfactory display state is realized.

Claims

1. A liquid crystal display element, comprising:

a scanning line electrode group and a signal line electrode group which are each composed of a plurality of electrodes, with each of the plurality of electrodes in the respective groups being arranged parallel and electrically insulated from each other,

wherein the scanning line electrode group and the signal line electrode group are located so as to cross each other and liquid crystal intervenes between the electrode groups, and

signal voltages are applied to some signal line electrodes of the signal line electrode group at points toward one end of the signal line electrode group while other signal voltages are applied to other signal line electrodes of the signal line electrode group at points toward an opposite end of the signal line electrode group.

2. The liquid crystal display element according to claim 1, wherein said liquid crystal is ferroelectric liquid crystal.

3. The liquid crystal display element according to claim 1, wherein said signal line electrode group or said scanning line electrode group has two kinds of electrodes with different width from each other so that tone display can be executed.

4. The liquid crystal display element according to claim 1, comprising charge and discharge current suppressing means for dulling steepness of a square waveform of signal voltages to be applied to the signal line electrodes.

5. The liquid crystal display element according to claim 1, wherein said signal line electrode group includes a plurality of electrode pairs, each pair being constituted by a wide signal line electrode and a narrow signal line electrode adjacent to the wide signal electrode, and signal voltages are applied to the wide signal line electrode belonging to one electrode pair and the wide signal electrode belonging to an adjacent electrode pair via respective points towards opposite ends of the signal line electrode group, and signal voltages are applied to the narrow signal line electrode belonging to the one electrode pair and the narrow signal line electrode belonging to the adjacent electrode pair via respective points towards the opposite ends of the signal line electrode group.