Liquid crystal driving method and liquid crystal display device

A liquid crystal display device comprising:

• a liquid crystal panel including dots where scanning electrodes and data electrodes intersect;
• scanning voltage driving means for applying a 2-level selection voltage to said scanning electrode which belong to a scanning electrode group according to an orthogonal function data value, said 2-level selection voltage having a positive polarity and a negative polarity with respect to a non-selection voltage acting as a center point, said scanning electrode group being formed of a set of n (.gtoreq.2) scanning electrodes;
• data voltage driving means for summing identity values every scanning electrode group, said identity value being a number of times that a display data value on each scanning electrode of each scanning electrode group on which said selection voltage is applied agrees with said orthogonal function data value provided to each of said scanning electrodes, and then applying a data voltage corresponding to the sum value to each of said data electrodes;
• and
• power supply means for producing drive voltages to said scanning voltage driving means and said data voltage driving means to drive said liquid crystal panel;
• said scanning voltage driving means dividing one frame period into plural virtual block periods;
• said scanning voltage driving means dividing a selection period in which said selection voltage is applied, into n divisional selection periods which are separated from each other at predetermined intervals, for all the scanning electrode groups to be selected in each of said block periods;
• and
• said scanning voltage driving means sequentially setting the i-th divisional selection period to each of remaining scanning electrode groups, continuously to the i-th (i=1 to n) divisional selection period of said scanning electrode group to be first selected in said block period.

A scanning voltage driving device suitable for a liquid crystal panel with plural output terminals, said scanning voltage driving device producing a 2-level selection voltage to plural scanning electrode groups which drive said liquid crystal panel according to a value of an orthogonal function data, said 2-level selection voltage having a positive polarity and a negative polarity with respect to a center point being a non-selection voltage, comprising:

• orthogonal function producing means for producing said orthogonal function data from input synchronous display signal groups;
• scanning line selecting means for creating a scanning line selection signal from said synchronous display signal groups to indicate an output terminal for the selection voltage;
• and
• voltage selecting means for selectively outputting a voltage amount said 2 levels of the selection voltages and the non-selection voltage every output terminal according to the value of said scanning line selection signal and the value of said orthogonal function data;
• said scanning line selecting means dividing one frame period into plural virtual block periods and then repeatedly creating said scanning line selection signal which sequentially selects all said scanning electrodes to be selected for said block period every plural scanning electrodes.

A liquid crystal driving method which drives a liquid crystal panel including dots where scanning electrodes and data electrodes intersect, by applying a 2-level selection voltage to said scanning electrodes which belong to a scanning electrode group according to an orthogonal function data value, said 2-level selection voltage having a positive polarity and a negative polarity with respect to a non-selection voltage acting as a center point, said scanning electrode group being formed of a set of n (.gtoreq.2) scanning electrodes;

• summing identity values every scanning electrode group, said identity values being a number of times that a display data value on each scanning electrode of a scanning electrode group on which said selection voltage is applied agrees with said orthogonal function data value provided to each of said scanning electrodes;
• and
• applying a data voltage corresponding to said summation value to each of said data electrodes, comprising the steps of;
• dividing one frame period into plural virtual block periods;
• dividing a selection period in which said selection voltage is applied, into n divisional selection periods which are separated from each other at predetermined intervals, for all the scanning electrode groups to be selected in each of said virtual block periods;
• and
• applying said selection voltage every divisional selection period.

A liquid crystal display device comprising:

• a liquid crystal panel including dots where scanning electrodes and data electrodes intersect;
• scanning voltage driving means for applying a 2-level selection voltage to said scanning electrode which belong to a scanning electrode group according to an orthogonal function data value, said 2-level selection voltage having a positive polarity and a negative polarity with respect to a non-selection voltage acting as a center point, said scanning electrode group being formed of a set of n (.gtoreq.2) scanning electrodes;
• data voltage driving means for summing identity values every scanning electrode group, said identity value being a number of times that a display data value on each scanning electrode of each scanning electrode group on which said selection voltage is applied agrees with said orthogonal function data value provided to each of said scanning electrodes, and then applying a data voltage corresponding to the sum value to each of said data electrodes;
• and
• power supply means for producing drive voltages to said scanning voltage driving means and said data voltage driving means to drive said liquid crystal panel;
• said scanning voltage driving means dividing one frame period into plural virtual block periods;
• said scanning voltage driving means dividing a selection period in which said selection voltage is applied, into n divisional selection periods which are separated from each other at predetermined intervals, for all the scanning electrode groups to be selected in each of said block periods;
• and
• said scanning voltage driving means applying said selection voltage every divisional selection period.

A liquid crystal display device having a liquid crystal module, said liquid crystal module comprising:

• a liquid crystal panel including dots at which a scanning electrode intersects perpendicularly with a data electrode;
• scanning voltage driving means for applying a selection voltage and a non-selection voltage to said scanning electrode;
• data voltage driving means for applying a data voltage to said data electrode;
• and
• a power supply circuit for producing drive voltages to said liquid crystal panel, said scanning voltage driving means and said data voltage driving means;
• said scanning voltage driving means producing an orthogonal function and outputting said selection voltage corresponding to said orthogonal function every two scanning electrodes;
• said data voltage driving means outputting a data voltage corresponding to an arithmetic value of said display data and said orthogonal function input from said scanning voltage driving means, to said data electrode;
• said scanning voltage driving means driving an internal logic circuit with a standard logic voltage and driving a liquid crystal voltage output means, which outputs said selection voltage, with a voltage higher than said standard logic voltage;
• said data voltage driving means driving said internal logic circuit and an output circuit which outputs said data voltage with said standard logic voltage;
• said liquid crystal module further comprising:
• first level shift means for shifting voltage levels of input logic signal voltages while maintaining same voltage differences between said input logic voltage signals to produce shifted input logic signal voltages;
• and
• second level shift means for shifting voltage levels of said shifted input logic signal voltages to produce liquid crystal output voltages.

Scanning voltage driving means suitable to a liquid crystal display device, which applies a selection voltage and a non-selection voltage to said liquid crystal panel including dots where a scanning electrode and a data electrode intersect perpendicularly, comprising:

• a level shifter which produces a scanning function, outputs said selection voltage corresponding to said scanning function every two scanning electrodes, and shifts a logic signal to be input to an internal logic circuit drive voltage (vyc-VyL), said internal logic circuit being driven with a level shifted signal;
• a liquid crystal voltage output circuit which outputs said selection voltage or non-selection voltage being driven with a voltage (VyH-VyL) higher than said drive voltage;
• first level shift means for shifting voltage levels of input logic signal voltages while maintaining same voltage differences between said input logic voltage signals to produce shifted input logic signal voltages;
• and
• second level shift means for shifting voltage levels of said shifted input logic signal voltages to produce liquid crystal output voltages.

A power supply circuit suitable for a liquid crystal display device, which produces drive voltages to a scanning voltage driving means and data voltage driving means for driving a liquid crystal panel;

• said power supply circuit including a DC/DC converter and an output amplifier for producing said drive voltage from a single power supply;
• the selection voltage of said scanning voltage driving means being variable according to the level of a control voltage input;
• wherein said non-selection voltage (Vy1), a 2-level selection voltage (Vy0, Vy2) with a positive level and a negative level symmetrically arranged with respect to said non-selection voltage, an internal logic reference voltage (VyC), and a high-withstand voltage portion drive voltage (VyL, VyH) are produced as the drive voltage of said scanning voltage driving means;
• and
• wherein the data voltage (Vx1) having the same level as said non-selection voltage, a 2-level data voltage (Vx0, Vx2) with a positive level and a negative level with respect to the data voltage, and an internal logic driving voltage (VxH, VxL) are produced as drive voltages of said data voltage driving means;
• said power supply circuit further including:
• first level shift means for shifting voltage levels of input logic signal voltages while maintaining same voltage differences between said input logic voltage signals to produce shifted input logic signal voltages;
• and
• second level shift means for shifting voltage levels of said shifted input logic signal voltages to produce liquid crystal output voltages.

A liquid crystal display device having a liquid crystal module, said liquid crystal module comprising:

• a liquid crystal panel including dots at which a scanning electrode intersects perpendicularly with a data electrode;
• scanning voltage driving means for applying a selection voltage and a non-selection voltage to said scanning electrode;
• data voltage driving means for applying a data voltage to said data electrode;
• and
• a power supply circuit for producing drive voltages to said liquid crystal panel, said scanning voltage driving means and said data voltage driving means;
• said scanning voltage driving means producing an orthogonal function and outputting said selection voltage corresponding to said orthogonal function every two scanning electrodes;
• said data voltage driving means outputting a data voltage corresponding to an arithmetic value of said display data and said orthogonal function input from said scanning voltage driving means, to said data electrode;
• said liquid crystal module further comprising:
• a level shift circuit for shifting a logic signal input to said scanning voltage driving means, to a reference voltage of said scanning voltage driving means;
• said scanning voltage driving means for driving an internal logic circuit at a voltage lower than said reference voltage and driving a liquid crystal voltage driving means which outputs said selection voltage at a voltage higher than said reference voltage;
• said data voltage driving means for driving said internal logic circuit, and an output circuit which outputs said data voltage, at a lower voltage;
• said liquid crystal module further comprising:
• first level shift means for shifting voltage levels of input logic signal voltages while maintaining same voltage differences between said input logic voltage signals to produce shifted input logic signal voltages;
• and
• second level shift means for shifting voltage levels of said shifted input logic signal voltages to produce liquid crystal output voltages.

A liquid crystal display device having a liquid crystal module, said liquid crystal module comprising:

• a liquid crystal panel including dots at which a scanning electrode intersects perpendicularly with a data electrode;
• scanning voltage driving means for applying a selection voltage and a non-selection voltage to said scanning electrode;
• data voltage driving means for applying a data voltage to said data electrode;
• and
• a power supply circuit for producing drive voltages to said liquid crystal panel, said scanning voltage driving means and said data voltage driving means;
• said scanning voltage driving means producing an orthogonal function and outputting said selection voltage corresponding to said orthogonal function every two scanning electrodes;
• said data voltage driving means outputting a data voltage corresponding to an arithmetic value of said display data and said orthogonal function input from said scanning voltage driving means, to said data electrode;
• said liquid crystal module further comprising:
• a level shift circuit for shifting a logic signal input to said data voltage driving means to a drive voltage of said data voltage driving means;
• said data voltage driving means being operated with a logic signal after said level shifting operation;
• said liquid crystal module further comprising:
• first level shift means for shifting voltage levels of input logic signal voltages while maintaining same voltage differences between said input logic voltage signals to produce shifted input logic signal voltages;
• and
• second level shift means for shifting voltage levels of said shifted input logic signal voltages to produce liquid crystal output voltages.