US 2012/0268504 A1 · LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR DRIVING A LIQUID CRYSTAL DISPLAY DEVICE

Abstract

The present invention provides a liquid crystal display device that appropriately compensates for a feed-through voltage. The liquid crystal display device is arranged such that when data of a certain gray level is to be displayed, the effective value of a pixel voltage changes in an N-frame cycle, a first pixel and a second pixel are provided that are different in the effective value during an i-th frame (1≦i≦N), the first pixel has a positive polarity during the i-th frame, whereas the second pixel has a negative polarity during an i{N/2 after}th frame, the first pixel has a polarity during a j-th frame (where 1≦j≦N and i≠j), the polarity being different from the polarity of the second pixel during a j{N/2 after}th frame, and when data of a first gray level is to be displayed, VB and VC are different from each other, where VA is a source voltage (VD) of the first pixel during the i-th frame, VB is a source voltage (VD) of the second pixel during the i{N/2 after}th frame, and VC is, in a case where data of a second gray level is to be displayed when the first pixel has a positive polarity during the j-th frame, a source voltage (VD) of the second pixel during the j{N/2 after}th frame for the case in which the source voltage (VD) of the first pixel during the first pixel is VA.

Claims31

Dependent claims

1-30. (canceled)

A liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
an effective value of a pixel voltage of each of the first and second pixels changes,
the effective value of the pixel voltage changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the effective value of the pixel voltage of the first pixel during the first period is larger than the effective value of the pixel voltage of the first pixel during the second period,
the effective value of the pixel voltage of the second pixel during the first period is smaller than the effective value of the pixel voltage of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
the pixel voltage of the first pixel during the I-th frame has a first polarity, the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
the pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the second pixel during the L-th frame,
with VC being a source voltage to be supplied to the first pixel during the K-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

17 more elements

A normally black liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes,
the luminance of each of the first and second pixels changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the luminance of the first pixel during the first period is larger than the luminance of the first pixel during the second period,
the luminance of the second pixel during the first period is smaller than the luminance of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
a pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the second pixel during the L-th frame,
with VC being a source voltage to be supplied to the first pixel during the K-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

18 more elements

A normally white liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes,
the luminance of each of the first and second pixels changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the luminance of the first pixel during the first period is smaller than the luminance of the first pixel during the second period,
the luminance of the second pixel during the first period is larger than the luminance of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
a pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the second pixel during the L-th frame,
with VC being a source voltage to be supplied to the first pixel during the K-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

18 more elements

A liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
an effective value of a pixel voltage of each of the first and second pixels changes periodically,
the effective value of the pixel voltage of the first pixel during an I-th frame is larger than the effective value of the pixel voltage of the first pixel during a frame immediately preceding the I-th frame,
the effective value of the pixel voltage of the first pixel during a J-th frame is smaller than the effective value of the pixel voltage of the first pixel during a frame immediately preceding the J-th frame,
the effective value of the pixel voltage of the second pixel during the I-th frame is larger than the effective value of the pixel voltage of the second pixel during the frame immediately preceding the I-th frame,
the effective value of the pixel voltage of the second pixel during the J-th frame is smaller than the effective value of the pixel voltage of the second pixel during the frame immediately preceding the J-th frame,
the pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
the pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the I-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the first pixel during the J-th frame,
with VC being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

16 more elements

A normally black liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes periodically,
the luminance of the first pixel during an I-th frame is larger than the luminance of the first pixel during a frame immediately preceding the I-th frame,
the luminance of the first pixel during a J-th frame is smaller than the luminance of the first pixel during a frame immediately preceding the J-th frame,
the luminance of the second pixel during the I-th frame is larger than the luminance of the second pixel during the frame immediately preceding the I-th frame,
the luminance of the second pixel during the J-th frame is smaller than the luminance of the second pixel during the frame immediately preceding the J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
a pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the I-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the first pixel during the J-th frame,
with VC being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

16 more elements

A normally white liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes periodically,
the luminance of the first pixel during an I-th frame is smaller than the luminance of the first pixel during a frame immediately preceding the I-th frame,
the luminance of the first pixel during a J-th frame is larger than the luminance of the first pixel during a frame immediately preceding the J-th frame,
the luminance of the second pixel during the I-th frame is smaller than the luminance of the second pixel during the frame immediately preceding the I-th frame,
the luminance of the second pixel during the J-th frame is larger than the luminance of the second pixel during the frame immediately preceding the J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
a pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity;
and
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA being a source voltage to be supplied to the first pixel during the I-th frame,
with VB being a source voltage to be supplied to the second pixel during the I-th frame,
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
with VA′ being a source voltage to be supplied to the first pixel during the J-th frame,
with VC being a source voltage to be supplied to the second pixel during the J-th frame,
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

16 more elements

A method for driving a liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
an effective value of a pixel voltage of each of the first and second pixels changes,
the effective value of the pixel voltage changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the effective value of the pixel voltage of the first pixel during the first period is larger than the effective value of the pixel voltage of the first pixel during the second period,
the effective value of the pixel voltage of the second pixel during the first period is smaller than the effective value of the pixel voltage of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
the pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
the pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity, the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA to the first pixel during the I-th frame;
supplying a source voltage having a voltage of VB to the second pixel during the J-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA′ to the second pixel during the L-th frame;
and
supplying a source voltage having a voltage of VC to the first pixel during the K-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

19 more elements

A method for driving a normally black liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes,
the luminance of each of the first and second pixels changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the luminance of the first pixel during the first period is larger than the luminance of the first pixel during the second period,
the luminance of the second pixel during the first period is smaller than the luminance of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
a pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity,
the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA to the first pixel during the I-th frame;
supplying a source voltage having a voltage of VB to the second pixel during the J-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA′ to the second pixel during the L-th frame;
and
supplying a source voltage having a voltage of VC to the first pixel during the K-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

20 more elements

A method for driving a normally white liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes,
the luminance of each of the first and second pixels changes in a cycle of N frames (where N is an even number of 4 or greater),
the N frames include a first period and a second period,
the luminance of the first pixel during the first period is smaller than the luminance of the first pixel during the second period,
the luminance of the second pixel during the first period is larger than the luminance of the second pixel during the second period,
an initial frame within the first period is an I-th frame,
an initial frame within the second period is a J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity, the pixel voltage of the first pixel during a K-th frame, which is a frame within the first period and which is different from the I-th frame, has a second polarity, which is different from the first polarity,
a pixel voltage of the second pixel during an L-th frame, which is a frame within the second period and which is different from the J-th frame, has the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity,
the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA to the first pixel during the I-th frame;
supplying a source voltage having a voltage of VB to the second pixel during the J-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA′ to the second pixel during the L-th frame;
and
supplying a source voltage having a voltage of VC to the first pixel during the K-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

19 more elements

A method for driving a liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
an effective value of a pixel voltage of each of the first and second pixels changes periodically,
the effective value of the pixel voltage of the first pixel during an I-th frame is larger than the effective value of the pixel voltage of the first pixel during a frame immediately preceding the I-th frame,
the effective value of the pixel voltage of the first pixel during a J-th frame is smaller than the effective value of the pixel voltage of the first pixel during a frame immediately preceding the J-th frame,
the effective value of the pixel voltage of the second pixel during the I-th frame is larger than the effective value of the pixel voltage of the second pixel during the frame immediately preceding the I-th frame,
the effective value of the pixel voltage of the second pixel during the J-th frame is smaller than the effective value of the pixel voltage of the second pixel during the frame immediately preceding the J-th frame,
the pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
the pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity,
the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA to the first pixel during the I-th frame;
supplying a source voltage having a voltage of VB to the second pixel during the I-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA′ to the first pixel during the J-th frame;
and
supplying a source voltage having a voltage of VC to the second pixel during the J-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

18 more elements

A method for driving a normally black liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes periodically,
the luminance of the first pixel during an I-th frame is larger than the luminance of the first pixel during a frame immediately preceding the I-th frame,
the luminance of the first pixel during a J-th frame is smaller than the luminance of the first pixel during a frame immediately preceding the J-th frame,
the luminance of the second pixel during the I-th frame is larger than the luminance of the second pixel during the frame immediately preceding the I-th frame,
the luminance of the second pixel during the J-th frame is smaller than the luminance of the second pixel during the frame immediately preceding the J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
a pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity,
the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supply a source voltage having a voltage of VA to the first pixel during the I-th frame;
supply a source voltage having a voltage of VB to the second pixel during the I-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supply a source voltage having a voltage of VA′ to the first pixel during the J-th frame;
and
supply a source voltage having a voltage of VC to the second pixel during the J-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

18 more elements

A method for driving a normally white liquid crystal display device,

wherein:
when data of a certain gray level is to be displayed individually by each of a first pixel and a second pixel for a predetermined period,
a luminance of each of the first and second pixels changes periodically,
the luminance of the first pixel during an I-th frame is smaller than the luminance of the first pixel during a frame immediately preceding the I-th frame,
the luminance of the first pixel during a J-th frame is larger than the luminance of the first pixel during a frame immediately preceding the J-th frame,
the luminance of the second pixel during the I-th frame is smaller than the luminance of the second pixel during the frame immediately preceding the I-th frame,
the luminance of the second pixel during the J-th frame is larger than the luminance of the second pixel during the frame immediately preceding the J-th frame,
a pixel voltage of the first pixel during the I-th frame has a first polarity,
the pixel voltage of the first pixel during the J-th frame has the first polarity,
a pixel voltage of the second pixel during the I-th frame has a second polarity, which is different from the first polarity, and
the pixel voltage of the second pixel during the J-th frame has the second polarity,
the method comprising the steps of:
in a case where data of a first gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA to the first pixel during the I-th frame;
supplying a source voltage having a voltage of VB to the second pixel during the I-th frame;
in a case where data of a second gray level as the certain gray level is to be displayed by the first and second pixels for the predetermined period,
supplying a source voltage having a voltage of VA′ to the first pixel during the J-th frame;
and
supplying a source voltage having a voltage of VC to the second pixel during the J-th frame,
wherein:
in a case where VA=VA′ for the first gray level and the second gray level, VB>VC.

18 more elements

Dependencies are inferred from the claim text.

Liquid crystal display device and method for driving a liquid crystal display device

Life of this patent

Liquid crystal display device and method for driving a liquid crystal display device

Life of this patent

Abstract

Claims31