Liquid crystal display

• US 7,006,064 B2
• Filed: 03/20/2002
• Issued: 02/28/2006
• Est. Priority Date: 11/16/2001
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Corporation (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Okazaki, Susumu, Zhang, Hongyong, Enomoto, Hiromi
• Primary Examiner(s): Shankar, Vijay
• Assistant Examiner(s): DHARIA, PRABODH M
• Application Number:
  US10/102,453
• Publication Number:
  US 20030095091A1
• Time in Patent Office: 1,441 Days
• Field of Search: 345 87-104, 345204-206, 345/84, 315/169.3, 349153-155, 349/42, 257/79, 257/347, 350/342, 359/296, 347/71
• US Class Current: 345/87
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

A common electrode driving circuit is provided on a TFT substrate as a first substrate. Striped common electrodes are formed along the layout of pixels, such as data lines (or scanning lines), on a common substrate as a second substrate. The common electrode driving circuit inverts a common electrode voltage that is applied to a common electrode of an odd-number order, relative to a common electrode voltage that is applied to a common electrode of an even-number order. The common electrode driving circuit inverts these common electrode voltages to match the polarity inversion period at the same time. Based on this, a common inversion driving system is realized, and flicker is reduced according to a lengthwise line (or crosswise line) inversion driving system.

Claims

1. A liquid crystal display comprising:

a first substrate on which pixel electrodes and thin film transistors are disposed in a matrix shape of m rows and n columns;

a second substrate on which a plurality of common electrodes are disposed in a stripe shape corresponding to the n columns of electrodes;

a liquid crystal layer provided between said first substrate and said second substrate;

a common electrode driving circuit provided on said first substrate on which are disposed said thin film transistors, and which applies mutually-inverted voltages to said common electrodes of odd-number orders and to said common electrodes of even-number orders respectively;

first conductors which electrically connect to said common electrodes of odd-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said common electrodes of odd-number orders; and

second conductors which electrically connect to said common electrodes of even-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said common electrodes of even-number orders.

2. The liquid crystal display according to claim 1, wherein said common electrode driving circuit inverts voltages to be applied to said common electrodes, at a predetermined interval.

3. The liquid crystal display according to claim 1, wherein said common electrodes of odd-number orders are electrically connected to each other on said second substrate, and said common electrodes of even-number orders are electrically connected to each other on said second substrate.

4. A liquid crystal display comprising:

a first substrate on which pixel electrodes and thin film transistors are disposed in a matrix shape of m rows and n columns;

a second substrate on which a plurality of common electrodes are disposed in a stripe shape corresponding to the m rows of electrodes;

a liquid crystal layer provided between said first substrate and said second substrate;

a common electrode driving circuit provided on said first substrate on which are disposed said thin film transistors, and which applies mutually-inverted voltages to said common electrodes of odd-number orders and to said common electrodes of even-number orders respectively;

first conductors which electrically connect to said common electrodes of odd-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said common electrodes of odd-number orders; and

second conductors which electrically connect to said common electrodes of even-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said common electrodes of even-number orders.

5. The liquid crystal display according to claim 4, wherein said common electrode driving circuit inverts voltages to be applied to said common electrodes, at a predetermined interval.

6. The liquid crystal display according to claim 4, wherein said common electrodes of odd-number orders are electrically connected to each other on said second substrate, and said common electrodes of even-number orders are electrically connected to each other on said second substrate.

7. A liquid crystal display comprising:

a first substrate on which pixel electrodes and thin film transistors are disposed in a matrix shape of m rows and n columns;

a second substrate on which a plurality of first common electrodes are disposed in a stripe shape corresponding to the n columns of electrodes, and also a plurality of second common electrodes are disposed in a stripe shape corresponding to the m rows of electrodes, with said first common electrodes and said second common electrodes being insulated from each other via an insulation layer;

a liquid crystal layer provided between said first substrate and said second substrate;

a common electrode driving circuit provided on said first substrate on which are disposed said thin film transistors, and which applies mutually-inverted voltages to said first common electrodes of odd-number orders and to said first common electrodes of even-number orders respectively, or which applies mutually-inverted voltages to said second common electrodes of odd-number orders and to said second common electrodes of even-number orders respectively;

first conductors which electrically connect to said first common electrodes of odd-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said first common electrodes of odd-number orders;

second conductors which electrically connect to said first common electrodes of even-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said first common electrodes of even-number orders;

third conductors which electrically connect to said second common electrodes of odd-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said second common electrodes of odd-number orders; and

fourth conductors which electrically connect to said second common electrodes of even-number orders, respectively, to said common electrode driving circuit in order to apply a voltage generated by said common electrode driving circuit to said second common electrodes of even-number orders.

8. The liquid crystal display according to claim 7, wherein said common electrode driving circuit inverts voltages to be applied to said common electrodes, at a predetermined interval.

9. The liquid crystal display according to claim 7, wherein said common electrodes of odd-number orders are electrically connected to each other on said second substrate, and said common electrodes of even-number orders are electrically connected to each other on said second substrate.