Liquid crystal display device

• US 20020057249A1
• Filed: 09/26/2001
• Published: 05/16/2002
• Est. Priority Date: 09/27/2000
• Status: Active Grant

• Current Assignee: Trivale Technologies, LLC (Vector Capital Corporation)
• Original Assignee: Kabushiki Kaisha Advanced Display
• Inventors: Miyake, Shiro, Takahashi, Seiki, Tashiro, Tomohiro
• Granted Patent: US 6,876,347 B2
• Time in Patent Office: Days
• US Class Current: 345/94
• CPC Class Codes: G09G 3/18 using liquid crystals
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

In a liquid crystal display device of the invention, a reference voltage having a maximum value higher than a maximum value of a signal voltage used for obtaining a predetermined liquid crystal application voltage-luminance characteristic and a minimum value lower than a minimum value of the signal voltage is formed, and a liquid crystal driving circuit forms a correction voltage to speed up a response of a liquid crystal element from this reference voltage, so that the speed of the response of the liquid crystal element is made high even at the time of change from a gray level to white or black.

Claims

1. A liquid crystal display device including liquid crystal elements for carrying out a display corresponding to an inputted image signal, comprising:

a liquid crystal driving circuit for supplying a voltage to each of the liquid crystal elements, the liquid crystal driving circuit supplying a signal voltage corresponding to the inputted image signal and a correction voltage for speeding up a response speed of each of the liquid crystal elements prior to the signal voltage,

wherein a maximum value of the correction voltage is higher than a maximum value of the signal voltage, and a minimum value of the correction voltage is lower than a minimum value of the signal voltage.

2. A liquid crystal display device including liquid crystal elements for carrying out a display corresponding to an inputted image signal, comprising:

a liquid crystal driving circuit for supplying a voltage to each of the liquid crystal elements, the liquid crystal driving circuit supplying a signal voltage corresponding to the inputted image signal and a correction voltage for speeding up a response speed of each of the liquid crystal elements prior to the signal voltage,

wherein the liquid crystal driving circuit includes a first reference voltage used for supplying the signal voltage and a second reference voltage used for supplying the correction voltage,

a maximum value of the second reference voltage is higher than a maximum value of the first reference voltage, and

a minimum value of the second reference voltage is lower than a minimum value of the first reference voltage.

3. A liquid crystal display device according to claim 2, wherein the liquid crystal driving circuit includes a terminal to which the second reference voltage is inputted and a terminal to which a control signal to select one of the first reference voltage and the second reference voltage is inputted.

4. A liquid crystal display device according to claim 2, wherein the second reference voltage is supplied at a time when the signal voltage is changed to one of its maximum value and minimum value.

5. A liquid crystal display device according to claim 2, wherein the second reference voltage is supplied which has such a value that when the signal voltage is changed to one of its maximum value and minimum value, the luminance of each of the liquid crystal elements corresponding to the signal voltage is not distorted.