Liquid crystal display apparatus
First Claim
1. A liquid crystal display apparatus comprising:
- a pair of substrates, at least one of which is transparent;
a liquid crystal layer disposed between the pair of substrates;
a plurality of groups of electrodes disposed on at least one of the pair of substrates for applying an electric field to the liquid crystal layer;
a liquid crystal display part having a plurality of active elements connected to the electrodes;
a drive means, supplied with display data from a means for supplying display data, the drive means for driving individual pixels of the liquid crystal display part by applying a voltage corresponding to the display data to the individual pixels, the drive means including a data emphasis means for comparing new display data supplied for a current display frame from the means for supplying display data, with previous display data supplied for a previous display frame from the means for supplying display data, and for emphasizing the new display data to effect an overshot drive to drive the liquid crystal display portion so that a transmittance level exceeds a designated transmittance level within a first frame period and is maintained to exceed the designated transmittance level within a second frame period subsequent to the first frame period, in response to a difference detected between the previous display data and new display data as a result of the comparison;
an illumination panel unit divided into a plurality of illumination panel portions, with each illumination panel portion having a light source providing illumination to the liquid crystal display part; and
an illumination control means, responsive to the overshot drive resulting in the transmittance level exceeding the designated transmittance level, for dynamically controlling an illumination start time and an illumination “
on”
time of the light source of individual said illumination panel portions, respectively, so that a time integral value of transmittance for an overshoot-frame, is equal to a time integral value of transmittance for a non-overshoot frame in which the transmission reaches and stays in a stable state at the designated transmittance level.
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Accused Products
Abstract
A liquid crystal display apparatus is able to display high quality motion pictures with less after-image when displaying motion pictures and with less fuzzy images without making the response speed of the liquid crystal too fast. The display data emphasized excessively more than a changed value is written into the pixel having any change detected by comparison with the previous display data and its value is made to change excessively more than the value corresponding to its original display data, and then, according to the optical response of the liquid crystal, the lighting time and the lighting period of the light source are controlled for the individual areas of the illumination unit having plural areas.
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Citations
11 Claims
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1. A liquid crystal display apparatus comprising:
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a pair of substrates, at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; a plurality of groups of electrodes disposed on at least one of the pair of substrates for applying an electric field to the liquid crystal layer; a liquid crystal display part having a plurality of active elements connected to the electrodes; a drive means, supplied with display data from a means for supplying display data, the drive means for driving individual pixels of the liquid crystal display part by applying a voltage corresponding to the display data to the individual pixels, the drive means including a data emphasis means for comparing new display data supplied for a current display frame from the means for supplying display data, with previous display data supplied for a previous display frame from the means for supplying display data, and for emphasizing the new display data to effect an overshot drive to drive the liquid crystal display portion so that a transmittance level exceeds a designated transmittance level within a first frame period and is maintained to exceed the designated transmittance level within a second frame period subsequent to the first frame period, in response to a difference detected between the previous display data and new display data as a result of the comparison; an illumination panel unit divided into a plurality of illumination panel portions, with each illumination panel portion having a light source providing illumination to the liquid crystal display part; and an illumination control means, responsive to the overshot drive resulting in the transmittance level exceeding the designated transmittance level, for dynamically controlling an illumination start time and an illumination “
on”
time of the light source of individual said illumination panel portions, respectively, so that a time integral value of transmittance for an overshoot-frame, is equal to a time integral value of transmittance for a non-overshoot frame in which the transmission reaches and stays in a stable state at the designated transmittance level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A liquid crystal display apparatus comprising:
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a pair of substrates, at least one of which is transparent; a liquid crystal layer disposed between the pair of substrates; a plurality of groups of electrodes disposed on at least one of the pair of substrates for applying an electric field to the liquid crystal layer; a liquid crystal display part having a plurality of active elements connected to the electrodes; a drive means, supplied with display data from a means for supplying display data, the drive means for driving individual pixels of the liquid crystal display part by applying a voltage corresponding to the display data to the individual pixels, the drive means including a data emphasis means for comparing new display data supplied for a current display frame from the means for supplying display data, with previous display data supplied for a previous display frame from the means for supplying display data, and for emphasizing the new display data to effect an overshot drive to drive the liquid crystal display portion so that a transmittance level exceeds a designated transmittance level within a first frame period and is maintained to exceed the designated transmittance level within a second frame period subsequent to the first frame period, in response to a difference detected between the previous display data and new display data as a result of the comparison; an illumination panel unit divided into a plurality of illumination panel portions, with each illumination panel portion having a light source providing illumination to the liquid crystal display part; and an illumination control means, responsive to the overshot drive resulting in the transmittance level exceeding the designated transmittance level, for dynamically controlling an illumination start time and an illumination “
on”
time of the light source of individual said illumination panel portions, respectively, so that a time integral value of transmittance for a time period occupied by the illumination “
on”
time in an overshoot-frame period is equal to a time integral value of transmittance for a time period occupied by the illumination “
on”
time in a frame period in which transmittance is in a stable state.
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Specification