Abstract:
In a plasma display device, sustain electrodes and subfields forming one frame are divided into a plurality of groups including first and second groups. In a first subfield of the first group, discharge cells of a second group are initialized during a second reset period and address discharged during a second address period after discharge cells of a first group are initialized during a first reset period and address discharged during a first address period. A difference between voltages applied to the first and second electrodes of a turn-on discharge cell during the first or the second address period subsequent to an auxiliary reset period is set to be greater than a difference between voltages applied to the first and second electrodes of the turn-on discharge cell during the first or the second address period subsequent to a main reset period.
Abstract:
Disclosed is a homeotropic alignment liquid crystal film without an alignment layer and a method for preparing the same. More specifically, the present invention relates to a homeotropic alignment liquid crystal film without using a separate alignment layer to induce a homeotropic alignment of the liquid crystal in which a liquid crystal layer has a homeotropic alignment property by coating a polymerizable and reactive liquid crystalline mixture solution including a predetermined surfactant on a plastic substrate whose surface are hydrophilic-treated, and drying and UV irradiating the mixture solution; a method for preparing the same. The homeotropic alignment liquid crystal film prepared according to the present invention may be very useful as a major component of a viewing-angle compensation film and a retardation film, etc. in LCD, and has advantages of simplicity of the manufacturing process, its shortened manufacturing time, its mass production, etc.
Abstract:
A method for driving a plasma display panel including a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes. A voltage which is greater than a sustain-discharge pulse voltage and less than a voltage obtained by subtracting the sustain-discharge pulse voltage from two times a discharge firing voltage is applied to at least one of the scan electrodes in a reset period of at least one subfield of a plurality of subfields forming a field. At this time, the voltage applied to the at least one of the scan electrodes can be applied as a pulse-type voltage or as a gradually increasing voltage.
Abstract:
In a method of driving a discharge display panel, each subfield may include a first address period, a first display-sustain period, a second address period, and a second display-sustain period. In the first address period, a predetermined wall voltage may be generated in isplay cells selected from the display cells of the first display electrode-line pair group. In the first display-sustain period, display-sustain discharge may occur during a time proportional to a gray scale weight of each of the subfields in the selected display cells of the display cells of the first display electrode-line pair group when the first address period has elapsed. In the second address period, a predetermined wall voltage may be generated in display cells selected from the display cells of the second display electrode-line pair group when the first display-sustain period has elapsed. In the second display-sustain period, display-sustain discharge may occur during a time proportional to a gray scale weight of each of the subfields in the selected display cells of the display cells of the first and second display electrode-line pair groups when the second address period has elapsed.
Abstract:
A method for driving a plasma display panel, including a reset period, an address period, and a sustain discharge period, wherein the reset period has a rising ramp section. During the rising ramp section of the reset period, a flat period of maintaining a peak voltage of a rising ramp applied to a scan electrode is maintained for longer than a period until a variation in a state of wall charges of the scan electrode is ended in all discharge cells.
Abstract:
A method of driving a plasma display panel having a discharge space formed by at least two electrodes is disclosed. In a reset period, the method includes changing a voltage of a first electrode by a first voltage to discharge the discharge space; floating the first electrode during a first period after changing the voltage of the first electrode by the first voltage; changing the voltage of the first electrode by a second voltage in a opposite direction of the first voltage after the first period; and floating the first electrode during the second period after changing the voltage of the first electrode by the second voltage. These steps may be repeated.
Abstract:
A plasma display panel (PDP) and a method for driving the PDP are described. A falling pulse waveform including alternately repeated voltage falling periods and floating periods that have a first mean slope and another falling pulse waveform including alternately repeated voltage falling periods and floating periods that have a second mean slope gentler than the first mean slope may be applied to sustain electrodes. The first and second slopes may be controlled by controlling the floating time or voltage falling range. In accordance with the present invention, it may be possible to apply pulse waveforms having diverse slopes through a simple driving circuit by floating a voltage charged in or discharged from a panel capacitor.
Abstract:
Abstract of the DisclosureA display device for displaying pictures by sequentially performing an address period and a sustain period, such as, a plasma display panel (PDP), is provided. The pixels of a panel are arranged into a plurality of groups, and an address period and a sustain period are sequentially performed on the pixels of individual groups. While an address period is being performed on the pixels of a certain group, the pixels of other groups are idle. While a sustain period is being performed on the pixels of the group subsequent to the address period, a sustain period is selectively performed on the pixels of each of other groups that have already undergone an address period. Accordingly, a sustain discharge operation is performed within a short period of time after an address operation is performed on each of the pixels, so that a stable sustain discharge occurs.
Abstract:
A PDP driving method. A falling ramp voltage is applied to a scan electrode so as to reset a state of wall charges of a discharge cell during a reset period. In this instance, a sustain electrode is maintained at a high voltage during an initial period for applying the falling ramp voltage, and the voltage at the sustain electrode is reduced to a normal voltage at a latter part of the period for applying the falling ramp voltage. Accordingly, the voltage applied to an address electrode is reduced in an address period since an erased amount of the wall charges of the address electrode is reduced during the reset period.
Abstract:
A PDP driving method. When a first sustain pulse is applied to a scan electrode during a sustain period, an address electrode is biased by a positive voltage, or the address electrode is biased. Therefore, when a large amount of wall charges are formed on the address and scan electrodes by address discharging during an address period, no main discharge is generated since a high potential of the address electrode is formed in the sustain period.