CN1617196A - Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment - Google Patents

Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment Download PDF

Info

Publication number
CN1617196A
CN1617196A CNA2004100956929A CN200410095692A CN1617196A CN 1617196 A CN1617196 A CN 1617196A CN A2004100956929 A CNA2004100956929 A CN A2004100956929A CN 200410095692 A CN200410095692 A CN 200410095692A CN 1617196 A CN1617196 A CN 1617196A
Authority
CN
China
Prior art keywords
pixel
state
son
field
electro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2004100956929A
Other languages
Chinese (zh)
Other versions
CN100363962C (en
Inventor
饭坂英仁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
BOE Technology HK Ltd
Original Assignee
Seiko Epson Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001367074A external-priority patent/JP3918536B2/en
Application filed by Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of CN1617196A publication Critical patent/CN1617196A/en
Application granted granted Critical
Publication of CN100363962C publication Critical patent/CN100363962C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

One field is divided into a plurality of subfields on a time base, thereby to set the subfields as control units for driving a pixel. A liquid crystal exhibits such a low response rate that the saturation response time thereof is longer than one subfield period. Accordingly, even when an ON voltage is applied to the liquid crystal in only one predetermined subfield by way of example, the transmission factor of the liquid crystal does not reach 100%. That is, the change of the transmission factor in each subfield can be finely controlled in the transitional period of the transmission factor of the liquid crystal. Thus, the number of gradations can be remarkably enlarged as compared with the number of the subfields within one field, and displays at multiple gradations can be realized.

Description

The driving method of electro-optical device, driving circuit, electro-optical device and electronic equipment
Technical field
The present invention relates to carry out driving method, driving circuit, electro-optical device and the electronic equipment that tone shows the electro-optical device of control by a son type of drive.
Background technology
Electro-optical device for example uses liquid crystal as the liquid crystal indicator of the electrooptical material display device of cathode ray tube (CRT) instead, just is being widely used in the display part of various messaging devices or LCD TV etc.
Here, for example following formation of existing electro-optical device.That is, existing electro-optical device by rectangular pixel electrodes arranged, be provided with TFT (the Thin FilmTransistor that is connected to this pixel electrode; Thin film transistor (TFT)) device substrate of such on-off element etc., formed and the counter substrate of the opposed opposite electrode of pixel electrode and the liquid crystal as electrooptical material of filling between these two substrates constitute.
In the display mode of the electro-optical device that constitutes like this, be down to be the common black that carries out the ordinary white of white display mode and carry out black display mode at not alive state (conducting state).Below, be under the situation of common black at the display mode of electro-optical device, illustrate and carry out the work that tone shows.
In said structure, when being applied to sweep signal on the on-off element by sweep trace, this on-off element becomes conducting state.When this conducting state, when pixel electrode being applied the picture signal of the voltage corresponding with tone by data line, the storage electric charge corresponding on this pixel electrode and opposite electrode with image signal voltage.Behind the stored charge, even this on-off element becomes cut-off state, the electric charge of putting aside in this electrode also can be kept by the capacitive character or the memory capacity of liquid crystal itself.So, drive each on-off element, when coming the quantity of electric charge of control store according to tone, owing on each pixel, change the state of orientation of liquid crystal, so in each pixel, change concentration.Therefore, can carry out tone shows.
Display mode at electro-optical device is under the ordinary white pattern situation, in above-mentioned work, if become conducting state at the state of voltage during for cut-off state, can obtain same effect so.
When above-mentioned work, since good in stored charge on the liquid crystal layer of each pixel is during a part, so can carry out following control.
1. select each sweep trace successively by scan line drive circuit
2. during the selection of this sweep trace, supply with picture signal to data line by data line drive circuit
3. by data line picture signal is sampled
According to above-mentioned 1., 2., 3. control, can carry out driving for the real-time multipath conversion of shared sweep trace of a plurality of pixels and data line.
But the picture signal that applies on data line is the voltage corresponding with tone, is simulating signal.Therefore, in the peripheral circuit of electro-optical device, need D/A translation circuit exclusive disjunction amplifier etc., so can cause the cost height of device integral body.In addition, because of the reason of the unevenness of the characteristic of these D/A translation circuits, operational amplifier etc. or various cloth line resistances etc., produce show irregular, so have the problem that is difficult to carry out high-quality demonstration, carry out under the demonstration situation of high-resolution particularly remarkable.
Therefore, in order to address the above problem, on the liquid crystal drive of electro-optical device, for example liquid-crystal apparatus,, propose on time shaft, to be divided into a plurality of sons field, in each son field, each pixel is applied a son type of drive of forward voltage or cut-off voltage according to tone with 1 as digital type of drive.
It is not voltage level that this child field type of drive makes the voltage that applies on the liquid crystal, but change the voltage (effective voltage) that liquid crystal is provided by the application time of potential pulse, thereby the transmitance of control liquid crystal board makes that the required voltage level only is conduction level and these two values of cut-off level on the liquid crystal drive.
But in the liquid crystal indicator as electro-optical device, under the situation of show events image, in order to improve its repeatability, the response characteristic of improving liquid crystal is absolutely necessary.The response characteristic of liquid crystal is when uniform temperature, and for the transfer from standing state (state of orientation), according to the size of the electric field that applies on the liquid crystal layer, response speed accelerates.
On liquid crystal layer, need certain response time to the transfer of state of orientation from the state that applies electric field.This response time generally is a few double-length degree that apply the electric field time on liquid crystal layer.
And, by a son driving liquid-crystal apparatus as electro-optical device is carried out under the situation of tone demonstration, owing to the temperature variation around liquid crystal itself or the liquid crystal changes response characteristic, so the pulse by becoming conducting state, the time collocation method that becomes the pulse of cut-off state change the tone characteristic of liquid crystal, the problem that exists image quality to reduce.
In addition, in a simple son type of drive, the sub-number of fields purpose problem that exists displayable tone to be confined to cut apart.For example, be divided at Jiang Chang under the situation of M son field, displayable tone is (M+1).In order to increase the tone number, must increase the number of son field, but in this case, need carry out the scanning of picture at high speed.But in fact the operating rate according to driving element limits.
Summary of the invention
The present invention is invention In view of the foregoing, purpose is to provide driving method, its driving circuit, the electro-optical device of electro-optical device and the electronic equipment that uses this electro-optical device, can improve response characteristic as the liquid crystal of electrooptical material, and raising image quality, even be not weighted, cutting apart under the situation that decides the son field simultaneously, also can carry out the tone more much more and show than sub-number of fields order by simple field.
The driving circuit of electro-optical device of the present invention is used for for by apply the display part that constitutes each pixel that electrooptical material that voltage can change light transmission rate is formed rectangularly, can make the saturated forward voltage of transmitance maybe can become the non-cut-off voltage that sees through state by supplying with, can carry out recently carrying out the son driving that tone shows according to light transmission state in the unit interval of described electrooptical material and non-state and the time that sees through between the state, wherein, comprise driver part, field interval is divided into each a plurality of son fields on time shaft is the control unit, applying under the situation of described forward voltage, the saturation response time that described sub time set must reach capacity than the transmitance of described electrooptical material is lacked, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, the electrooptical material that constitutes each pixel is by applying the transmitance that voltage can change light.Driver part serves as the control unit field interval is divided into each a plurality of son fields on time shaft, applies on the electrooptical material by making the saturated forward voltage of transmitance or allowing to become the non-cut-off voltage that sees through state, each pixel is carried out the son field drive.Driver part is short with time set saturation response time that must reach capacity than the transmitance of electrooptical material of son under the situation that has applied forward voltage, decide son field that applies forward voltage and the son field that applies cut-off voltage according to video data, carry out tone and show.Because the time of the saturation response time ratio 1 son field of electrooptical material is long, so the transmitance of electrooptical material can change more meticulously than the sub-number of fields in 1.Thus, compare, can enlarge markedly expressible tone number with the sub-number of fields in 1.
The driving circuit of electro-optical device of the present invention is used for for by apply the display part that constitutes each pixel that electrooptical material that voltage can change light transmission rate is formed rectangularly, can make the saturated forward voltage of transmitance maybe can become the non-cut-off voltage that sees through state by supplying with, can carry out recently carrying out the son driving that tone shows according to light transmission state in the unit interval of described electrooptical material and non-state and the time that sees through between the state, it is characterized in that, comprise driver part, field interval is divided into each a plurality of son fields on time shaft is the control unit, applying under the situation of described cut-off voltage, the time set of described son field must be transformed into the non-non-response time weak point that sees through that sees through state from state of saturation than the transmitance of described electrooptical material, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, driver part must be transferred to the non-non-response time weak point that sees through that sees through state from state of saturation than the transmitance of electrooptical material with the time set of son field under the situation that has applied forward voltage, decide son field that applies forward voltage and the son field that applies cut-off voltage according to video data, carry out tone and show.Because it is longer than the time of 1 son field that electrooptical material non-sees through the response time, so the transmitance of electrooptical material can change more meticulously than the sub-number of fields in 1.Thus, compare, can enlarge markedly expressible tone number with the sub-number of fields in 1.
Described driver part is applied to described forward voltage on the described electrooptical material in continuous or discrete son, makes that the integrated value that sees through state of described electrooptical material of described field interval is corresponding with video data.
According to such structure, forward voltage is applied on the electrooptical material in continuous or discrete son, makes that the integrated value that sees through state of the electrooptical material in the field interval is corresponding with video data.Thus, can carry out the demonstration of masstone.
In addition, described a plurality of sons field in each is set to roughly the same time width.
According to such structure, can simplified driving circuit, and during the son of display device that can be applied to use liquid crystal etc. to have the electrooptical material of certain response time drives.
The described saturation response time is the above times of three sub-field periods.
According to such structure, because the variation of the transmitance of the electrooptical material of average 1 sub-field period is smaller, so can carry out the more demonstration of masstone.
Described forward voltage is applied on the described electrooptical material in the sub-field period concentrated area of the beginning side of described field interval.
According to such structure, can easily make electrooptical material become the non-state that sees through in the terminal of field interval, so can improve the response characteristic of demonstration.
Described cut-off voltage is applied on the described electrooptical material in the sub-field period concentrated area of the end side of described field interval.
According to such structure, can easily make electrooptical material become the non-state that sees through in the terminal of described field interval, so can improve the response characteristic of demonstration.
The driving method of electro-optical device of the present invention is used for for by apply the display part that constitutes each pixel that electrooptical material that voltage can change light transmission rate is formed rectangularly, can make the saturated forward voltage of transmitance maybe can become the non-cut-off voltage that sees through state by supplying with, can carry out recently carrying out the son driving that tone shows according to light transmission state in the unit interval of described electrooptical material and non-state and the time that sees through between the state, it is characterized in that, field interval is divided into each a plurality of son fields on time shaft is the control unit, applying under the situation of described forward voltage, the saturation response time that described sub time set must reach capacity than the transmitance of described electrooptical material is lacked, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, the electrooptical material that constitutes each pixel is by applying the transmitance that voltage can change light.In a son driving, field interval is divided into each a plurality of son fields on time shaft is the control unit, apply on the electrooptical material by making the saturated forward voltage of transmitance or allowing to become the non-cut-off voltage that sees through state, each pixel is carried out a son driving.Under the situation that has applied forward voltage that time set saturation response time that must reach capacity than the transmitance of electrooptical material of son is short, decide the son that applies forward voltage and apply the son of cut-off voltage according to video data, carry out tone and show.Because the time of the saturation response time ratio 1 son field of electrooptical material is long, so the transmitance of electrooptical material can change more meticulously than the sub-number of fields in 1.Thus, compare, can enlarge markedly expressible tone number with the sub-number of fields in 1.
The driving method of electro-optical device of the present invention is used for for by apply the display part that constitutes each pixel that electrooptical material that voltage can change light transmission rate is formed rectangularly, can make the saturated forward voltage of transmitance maybe can become the non-cut-off voltage that sees through state by supplying with, can carry out recently carrying out the son driving that tone shows according to light transmission state in the unit interval of described electrooptical material and non-state and the time that sees through between the state, it is characterized in that, field interval is divided into each a plurality of son fields on time shaft is the control unit, applying under the situation of described cut-off voltage, the time set of described son field must be transformed into the non-non-response time weak point that sees through that sees through state from state of saturation than the transmitance of described electrooptical material, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, under the situation that has applied forward voltage, the time set of son field must be transferred to the non-non-response time weak point that sees through that sees through state from state of saturation than the transmitance of electrooptical material, decide son field that applies forward voltage and the son field that applies cut-off voltage according to video data, carry out tone and show.Because it is longer than the time of 1 son field that electrooptical material non-sees through the response time, so the transmitance of electrooptical material can change more meticulously than the sub-number of fields in 1.Thus, compare, can enlarge markedly expressible tone number with the sub-number of fields in 1.
The performance of described tone is undertaken by in continuous or discrete son described forward voltage being applied on the described electrooptical material, makes that the integrated value that sees through state of described electrooptical material of described field interval is corresponding with video data.
According to such structure, forward voltage is applied on the electrooptical material in continuous or discrete son, makes that the integrated value that sees through state of the electrooptical material in the field interval is corresponding with video data.Thus, can carry out the demonstration of masstone.
The driving method of electro-optical device of the present invention is used for each is divided into a plurality of sons field on time shaft, according to video data, in each son, be controlled at the pixel that comprises electrooptical material that inserts and puts in the intersection region of a plurality of data lines and a plurality of sweep traces by forward voltage or cut-off voltage, the enterprising circumstances in which people get things ready for a trip accent of each pixel of described a plurality of pixels shows by driving inside, it is characterized in that, applying under the situation of described forward voltage, the saturation response time that described sub time set must reach capacity than the transmitance of described electrooptical material is lacked, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, forward voltage situation under set to such an extent that the saturation response time that than the transmitance of electrooptical material reaches capacity short having applied time of son.Thus, the variation of the transmitance of the electrooptical material in 1 sub-field period is little, can carry out the demonstration of masstone.
Electro-optical device of the present invention is characterised in that the driving circuit that comprises above-mentioned electro-optical device.
According to such structure, in a son driving, can control transmitance meticulously, can carry out masstone and show.
Electro-optical device of the present invention comprises: pixel, comprise with each of a plurality of sweep traces and a plurality of data lines and intersect the pixel electrode of corresponding configuration, control applies the on-off element of voltage to each described pixel electrode, the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts, and with the opposite electrode of described pixel electrode arranged opposite; And driver part, can make the forward voltage more than the saturated saturation voltage of transmitance or to can be changed into the non-cut-off voltage that sees through state by supplying with, according to the light transmission state of unit interval of described electrooptical material with non-ly see through son that state between the state and time recently carries out the tone performance and drive; It is characterized in that, described driver part serves as the control unit field interval is divided into each a plurality of son fields on time shaft, applying under the situation of described forward voltage, the saturation response time that described sub time set must reach capacity than the transmitance of described electrooptical material is lacked, decide son field that applies described forward voltage and the son field that applies described cut-off voltage according to video data, carry out tone and show.
According to such structure, pixel comprises pixel electrode, on-off element, electrooptical material and opposite electrode, for example is applied to liquid-crystal apparatus, can carry out masstone and show.
Electronic equipment of the present invention is characterised in that and comprises above-mentioned electro-optical device.
According to such structure, can carry out masstone and show.
Driving method of the present invention is divided into a plurality of sons field with each on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that, assign to control so that each pixel of described a plurality of pixels becomes the first half that pulse signal through state concentrates on described.
According to such structure, the correspondence of intersecting a plurality of data lines and a plurality of sweep trace disposes, a plurality of pixels by the electrooptical material that will comprise pixel electrode and insert and put in the intersection region of described a plurality of data lines and a plurality of sweep traces drive with forward voltage or cut-off voltage according to tone data, thereby each pixel is become through state or the non-state that sees through, make a plurality of pixels carry out tone and show.In this case, each is divided into a plurality of sons field on time shaft, a plurality of pixels are driven by forward voltage or cut-off voltage according to tone data in each son field, concentrate first half on the scene to assign to control so that each pixel of a plurality of pixels becomes through the pulse signal of state.
Thus, can shorten the time that reaches as the target transmitance in the liquid crystal of the electrooptical material that constitutes pixel, realize high-speed response, its result can improve image quality.
The driving method of electro-optical device of the present invention with each the time hear and to be divided into a plurality of sons on the axle, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, the direction that changes according to picture brightness changes the described described pulse width of switching in the field that sees through the pulse signal of state that becomes.
According to the present invention, in each son field, drive pixel according to tone data with forward voltage or cut-off voltage, by described each pixel is become through state or the non-state that sees through, making described pixel carry out tone shows, wherein, pixel comprises: intersect the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines; The on-off element of the voltage that control applies each described pixel electrode; The liquid crystal that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts; And with respect to the opposite electrode of described pixel electrode arranged opposite.In this case, each is divided into a plurality of sons field on time shaft, each pixel of a plurality of pixels is driven by forward voltage or cut-off voltage according to tone data in each son field, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, change the described pulse width that sees through the pulse signal of state that becomes in the field of described switching according to the change direction of picture brightness.
Thus, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, can improve response characteristic, improve image quality, make the tone that on the direction that picture brightness changes, reaches expectation rapidly as the liquid crystal of the electrooptical material that constitutes pixel.
The driving method of electro-optical device of the present invention is divided into a plurality of sons field with each on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that output becomes the non-pulse signal that sees through state in described last at least son field.
According to the present invention, drive pixel according to tone data with forward voltage or cut-off voltage, by described each pixel is become through state or the non-state that sees through, making described pixel carry out tone shows, wherein, pixel comprises: intersect the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines; The on-off element of the voltage that control applies each described pixel electrode; The liquid crystal that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts; And with respect to the opposite electrode of described pixel electrode arranged opposite.In this case, each is divided into a plurality of sons field on time shaft, each pixel of a plurality of pixels is driven by forward voltage or cut-off voltage according to tone data in each son field, under the situation of show events image, in the switching on the scene, output becomes the non-pulse signal that sees through state in described last at least son field.
Thus, before showing next, can insert the black display of short time, each is discontinuous, can show discontinuously, so improve the identity of live image.
The driving method of electro-optical device of the present invention is divided into a plurality of sons field with each on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that, according to the environment temperature of described electrooptical material itself or this electrooptical material, change and become the described pulse width that sees through the pulse signal of state in each.
According to the present invention, drive pixel according to tone data with forward voltage or cut-off voltage, by described each pixel is become through state or the non-state that sees through, making described pixel carry out tone shows, wherein, pixel comprises: intersect the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines; The on-off element of the voltage that control applies each described pixel electrode; The liquid crystal that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts; And with respect to the opposite electrode of described pixel electrode arranged opposite.In this case, each is divided into a plurality of sons field on time shaft, each pixel of a plurality of pixels is driven by forward voltage or cut-off voltage according to tone data in each son field, according to the environment temperature of described electrooptical material itself or this electrooptical material, change the control of the pulse width that becomes the described pulse signal that sees through state in each.Thus,, also can make the tone stability of characteristics, can improve the tone characteristic degradation that temperature variation causes, improve image quality even change response speed according to the temperature around liquid crystal itself or the liquid crystal as the liquid crystal of electrooptical material.
The driving circuit of electro-optical device of the present invention has by intersecting the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, control applies the on-off element of voltage to each described pixel electrode, the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts, and the pixel of forming with the opposite electrode of described pixel electrode arranged opposite, each is divided into a plurality of sons field on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that, comprise control assembly, assign to control so that each pixel of described a plurality of pixels becomes the first half that pulse signal through state concentrates on described.
In a form of the present invention, described control assembly is characterised in that, under show events image situation, in the switching on the scene, under the situation that displaying contents changes, the direction that changes according to picture brightness changes the described described pulse width that sees through the pulse signal of state of becoming of field of switching.
According to the present invention, drive pixel according to tone data with forward voltage or cut-off voltage, by described each pixel is become through state or the non-state that sees through, making described pixel carry out tone shows, wherein, pixel comprises: intersect the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines; The on-off element of the voltage that control applies each described pixel electrode; The liquid crystal that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts; And with respect to the opposite electrode of described pixel electrode arranged opposite.In this case, each is divided into a plurality of sons field on time shaft, each pixel of a plurality of pixels is driven by forward voltage or cut-off voltage according to tone data in each son field, control by control assembly, make each pixel of a plurality of pixels become through the concentrated first half on the scene of the pulse signal of state.
Thus, can shorten the time that reaches as the target transmitance in the liquid crystal of the electrooptical material that constitutes pixel, realize high-speed response, its result can improve image quality.
In addition, described control assembly is under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, control according to the direction that picture brightness changes, make the described pulse width that sees through the pulse signal of state that becomes in the field of the described switching of change.
Thus, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, can improve response, improve image quality, so that on the direction that picture brightness changes, reach the tone of expectation rapidly as the liquid crystal of the electrooptical material that constitutes pixel.
In another form of the present invention, described control assembly is characterised in that output becomes the non-pulse signal that sees through state in described last at least son field.
Thus, before showing next, can insert the black display of short time, each is discontinuous, can show discontinuously, so improve the identity of live image.
The driving circuit of electro-optical device of the present invention has by intersecting the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, control applies the on-off element of voltage to each described pixel electrode, the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts, and the pixel of forming with the opposite electrode of described pixel electrode arranged opposite, each is divided into a plurality of sons field on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, making a plurality of pixels that comprise electrooptical material that insert and put in the intersection region of a plurality of data lines and a plurality of sweep traces carry out tone shows, it is characterized in that, also comprise: temperature detection part, detect described electrooptical material self or this electrooptical material temperature on every side; And the pulse width correcting unit, export to change in each according to the detection of described temperature detection part and become the described pulse width that sees through the pulse signal of state according to what tone was predetermined.
According to the present invention, in each son field, drive pixel according to tone data with forward voltage or cut-off voltage, by described each pixel is become through state or the non-state that sees through, making described pixel carry out tone shows, wherein, pixel comprises: intersect the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines; The on-off element of the voltage that control applies each described pixel electrode; The liquid crystal that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts; And with respect to the opposite electrode of described pixel electrode arranged opposite.In this case, each is divided into a plurality of sons field on time shaft, each pixel of a plurality of pixels is driven by forward voltage or cut-off voltage according to tone data in each son field.Detect the environment temperature of described electrooptical material itself or this electrooptical material by temperature detection part, according to the detection output of this temperature detection part, control assembly changes the described pulse width that sees through the pulse signal of state that becomes that is predetermined according to tone in each son field.
Thus,, also can make the tone stability of characteristics, can improve the tone characteristic degradation that temperature variation causes, improve image quality even change response speed according to the temperature around liquid crystal itself or the liquid crystal as the liquid crystal of electrooptical material.
Electro-optical device of the present invention is characterised in that, comprise: pixel, comprise with each of a plurality of sweep traces and a plurality of data lines intersects corresponding configuration pixel electrode, control the electrooptical material that inserts and puts in the on-off element of the voltage that each described pixel electrode is applied, the intersection region between described a plurality of data lines and a plurality of sweep trace and with the opposite electrode of described pixel electrode arranged opposite; Scan line drive circuit is divided into a plurality of sons field with each on time shaft, will make the sweep signal of described on-off element conducting supply with described each sweep trace in each height field of this a plurality of sons field; Data line drive circuit, according to tone data, each the son in according to the indication each pixel forward voltage or cut-off voltage, supply with on to each this pixel corresponding scanning beam described sweep signal during, supply to and this pixel corresponding data line each pixel is become through state or the non-binary signal that sees through state; And control assembly, the data line drive circuit to be controlled, feasible each pixel with described a plurality of pixels becomes the first half that concentrates on described field through the pulse signal of state.
In a form of the present invention, described control assembly is under show events image situation, in the switching on the scene, under the situation that displaying contents changes, the direction that changes according to picture brightness change described switching the field become the described pulse width that sees through the pulse signal of state.
According to the present invention, each is divided into a plurality of sons field on time shaft, in each height field of this a plurality of sons field, to make the sweep signal of described on-off element conducting supply to described each sweep trace by scan line drive circuit, according to tone data, in each son according to indication forward voltage or cut-off voltage, make each pixel become through state or the non-binary signal that sees through state described sweep signal is supplied to each pixel corresponding scanning line during, supply on the corresponding data line by data line drive circuit, make described each pixel carry out tone and show.In this case, by control assembly control data line drive circuit, make to become in each pixels of described a plurality of pixels to concentrate on described first half through the pulse signal of state.
Thus, can shorten the time that reaches as the target transmitance in the liquid crystal of the electrooptical material that constitutes pixel, realize high-speed response, its result can improve image quality.
In addition, described control assembly is under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, control according to the direction that picture brightness changes, make the described pulse width that sees through the pulse signal of state that becomes in the field of the described switching of change.
Thus, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, can improve response, improve image quality, so that on the direction that picture brightness changes, reach the tone of expectation rapidly as the liquid crystal of the electrooptical material that constitutes pixel.
In addition, the output in described last at least son field of described control assembly becomes the non-pulse signal that sees through state.
Thus, before showing next, can insert the black display of short time,, can show discontinuously, so improve the identity of live image because each is discontinuous.
Electro-optical device of the present invention comprises: pixel, comprise with each of a plurality of sweep traces and a plurality of data lines intersects corresponding configuration pixel electrode, control the electrooptical material that inserts and puts in the on-off element of the voltage that each described pixel electrode is applied, the intersection region between described a plurality of data lines and a plurality of sweep trace and with the opposite electrode of described pixel electrode arranged opposite; Scan line drive circuit is divided into a plurality of sons field with each on time shaft, will make the sweep signal of described on-off element conducting supply with described each sweep trace in each height field of this a plurality of sons field; Data line drive circuit, according to tone data, each the son in according to the indication each pixel forward voltage or cut-off voltage, supply with on to each this pixel corresponding scanning beam described sweep signal during, supply to and this pixel corresponding data line each pixel is become through state or the non-binary signal that sees through state; And control assembly, the data line drive circuit is controlled, feasible each pixel with described a plurality of pixels becomes the first half that concentrates on described field through the pulse signal of state, it is characterized in that, also comprise: temperature detection part, detect described electrooptical material self or this electrooptical material temperature on every side; And the pulse width correcting unit, export to change in each according to the detection of described temperature detection part and become the described pulse width that sees through the pulse signal of state according to what tone was predetermined.
According to the present invention, each is divided into a plurality of sons field on time shaft, in each height field of this a plurality of sons field, to make the sweep signal of described on-off element conducting supply to described each sweep trace by scan line drive circuit, according to tone data, in each son according to indication forward voltage or cut-off voltage, make each pixel become through state or the non-binary signal that sees through state described sweep signal is supplied to each pixel corresponding scanning line during, supply on the corresponding data line by data line drive circuit, make described each pixel carry out tone and show.In this case, by control assembly control data line drive circuit, make to become in each pixels of described a plurality of pixels to concentrate on described first half through the pulse signal of state.
In addition, detect described electrooptical material self or this electrooptical material temperature on every side by temperature detection part, according to the detection output of this temperature detection part, in each, change the described pulse width that sees through the pulse signal of state that becomes that is predetermined according to tone by the pulse width correcting unit.
Thus,, also can make the tone stability of characteristics, can improve the tone characteristic degradation that temperature variation causes, improve image quality even change response speed according to the temperature around liquid crystal itself or the liquid crystal as the liquid crystal of electrooptical material.
As electronic equipment of the present invention, owing to have above-mentioned electro-optical device,, realize high-speed response so can shorten the time that reaches as the target transmitance in the liquid crystal of the electrooptical material that constitutes pixel, its result can improve image quality.
In addition, as electronic equipment of the present invention, owing to have above-mentioned electro-optical device, so under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, can improve response as the liquid crystal of the electrooptical material that constitutes pixel, improve image quality, so that on the direction that picture brightness changes, reach the tone of expectation rapidly.
In addition, as electronic equipment of the present invention, owing to have above-mentioned electro-optical device,,, can show discontinuously, so improve the identity of live image because each is discontinuous so before showing next, can insert the black display of short time.
And, as electronic equipment of the present invention, owing to have above-mentioned electro-optical device, even so change response speed according to the temperature around liquid crystal itself or the liquid crystal as the liquid crystal of electrooptical material, also can make the tone stability of characteristics, can improve the tone characteristic degradation that temperature variation causes, improve image quality.
In addition, the present invention is the invention that is used to realize above-mentioned purpose, described driving method is divided into a plurality of sons field with each on time shaft, according to video data, by forward voltage or cut-off voltage control make pixel become through state the son, the a plurality of pixels that comprise electrooptical material that driving inserts and puts in the intersection region of a plurality of data lines and a plurality of sweep traces, thereby making each pixel of described a plurality of pixels carry out tone with a son type of drive inside shows, it is characterized in that, according to video data, first half on the scene is continuously in the son that becomes the state of seeing through of configuration, makes part field not become state through state according to the rule by the video data decision.
The invention is characterized in, according to video data, first half on the scene is continuously in the son of the state that sees through of configuration, except seeing through son that state begins, makes near the son field beginning through state become the non-state that sees through according to the rule by described video data decision.
The invention is characterized in, according to video data, first half on the scene is continuously in the son of the state that sees through of configuration, except seeing through son that state finishes, makes near the son field finishing through state become the non-state that sees through according to the rule by described video data decision.
The driving circuit of electro-optical device of the present invention has by intersecting the pixel electrode of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, control applies the on-off element of voltage to each described pixel electrode, the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts, and the pixel of forming with the opposite electrode of described pixel electrode arranged opposite, by forward voltage or cut-off voltage be controlled at each the son in make pixel become through state the son, transfer in the enterprising circumstances in which people get things ready for a trip of each pixel of described a plurality of pixels with a son type of drive inside thus and show, it is characterized in that, comprise control assembly, in the son field that becomes the state of seeing through of configuration continuously,, part field controls so that becoming the non-state that sees through.
The invention is characterized in and comprise: pixel, each that comprises a plurality of sweep traces and a plurality of data lines intersect corresponding configuration pixel electrode, control to each described pixel electrode apply the on-off element of voltage, the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts and with the opposite electrode of described pixel electrode arranged opposite; Scan line drive circuit is divided into a plurality of sons field with each on time shaft, will make the sweep signal of described on-off element conducting supply with described each sweep trace in each height field of this a plurality of sons field; And control assembly, make each pixel of described a plurality of pixels become the first half that concentrates on described field through the pulse signal of state, becoming of disposing continuously through in the pulse signal of state, come the control data line drive circuit according to video data, make a part of pulse signal become the non-state that sees through.
In addition, the present invention is a kind of electronic equipment, it is characterized in that, has above-mentioned electro-optical device.
Description of drawings
Fig. 1 represents the block scheme of the electro-optical device of the present invention the 1st embodiment.
The key diagram of the concrete structure of the pixel in Fig. 2 presentation graphs 1.
Fig. 3 represents to be built in the circuit diagram of the concrete structure of the starting impulse generative circuit that generates starting impulse DY in the timing signal generating unit 200.
The block scheme of the concrete structure of the data line drive circuit 140 in Fig. 4 presentation graphs 1.
Fig. 5 is the timing diagram of the work of explanation electro-optical device.
Fig. 6 represents the timing diagram of each sub-field period in the son driving.
Fig. 7 represents the timing diagram of the voltage that applies on AC signal in the electro-optical device of the 1st embodiment and the pixel electrode with frame unit.
Fig. 8 represents that son drives the key diagram that concerns between the variable condition of liquid crystal drive voltage waveform in fashionable each of writing of the pixel data cause and the liquid crystal transmitance in each.
Fig. 9 is illustrated under the situation of show events image, the key diagram that writes state of a control of the son pixel data that produces when displaying contents changes in the switching.
Figure 10 represents the key diagram that concerns between the variable condition of liquid crystal drive voltage waveform in fashionable each of writing of pixel data that existing analog-driven produces and the liquid crystal transmitance in each.
Figure 11 represents the block scheme of the electro-optical device of the 2nd embodiment of the present invention.
Figure 12 is the shop drawing of booster circuit 540 among explanation the 2nd embodiment.
Figure 13 represents among the 2nd embodiment figure of the liquid crystal transmitance under as shown in figure 16 the control situation.
Figure 15 is the timing diagram of work of the electro-optical device of explanation the 2nd embodiment.
Figure 16 represents among the 2nd embodiment to show the timing diagram during the white demonstration of son.
Figure 17 represents among the 2nd embodiment pixel intensity curve map under as shown in figure 16 the control situation.
Figure 18 represents the structural plan figure of electro-optical device 100.
Figure 19 is the sectional view of the A-A ' line among Figure 18.
Figure 20 represents to use the sectional view of projector structure of electronic equipment one example of the electro-optical device of the embodiment of the invention.
Figure 21 represents to use the sectional view of electronic equipment one routine personal computer architecture of the electro-optical device of the embodiment of the invention.
Figure 22 is the oblique view of portable phone structure of electronic equipment one example of the expression electro-optical device of using the embodiment of the invention.
Figure 23 represents the block scheme of the driving circuit that adopts among the 3rd embodiment.
Figure 24 is the key diagram of explanation the 3rd embodiment.
Figure 25 is the key diagram of explanation the 3rd embodiment.
Embodiment
Below, with reference to accompanying drawing embodiments of the invention are described.Fig. 1 represents the block scheme of the electro-optical device of the present invention the 1st embodiment.Fig. 2 is the key diagram of the concrete structure of pixel in the presentation graphs 1.
The electro-optical device of present embodiment for example is to use the liquid-crystal apparatus of liquid crystal as electrooptical material, and is as described below, keeps certain clearance to bond mutually by device substrate and counter substrate, and the liquid crystal that inserts and puts as electrooptical material in this gap constitutes.Here, the display mode that electro-optical device is described is a white-black pattern, carries out white and show (conducting state) under the state that applies voltage on the pixel, carries out the situation of black display (cut-off state) under the state that does not apply voltage.
In the electro-optical device of present embodiment, as device substrate, adopt transparency carriers such as glass substrate,, form the transistor that drives pixel thereon, and form peripheral driving circuit.On the other hand, among the viewing area 101a on device substrate, multi-strip scanning line 112 extends to form along X (OK) direction in the drawings, and many data lines 114 extend to form along Y (row) direction.And each of pixel 110 and sweep trace 112 and data line 114 intersected corresponding setting, is arranged in rectangular.
Here, for convenience of explanation, in the present embodiment, be the m bar with the total number of sweep trace 112, the total number of data line 114 is n bar (m, n are respectively the integer more than 2), and m is capable * and the array display device of n row illustrates, but the present invention is not limited to this.
The structure of＜pixel 〉
As the concrete structure of pixel 110, for example can enumerate the structure shown in Fig. 2 (a).In this structure, (TFT: thin film transistor (TFT)) 116 grid is connected to sweep trace 112 as the transistor of switch block, source electrode is connected to data line 114, drain electrode is connected to pixel electrode 118, and the liquid crystal 105 that inserts and puts as electrooptical material between pixel electrode 118 and opposite electrode 108 forms liquid crystal layer.Here, as described later, opposite electrode 108 is actually the transparency electrode that forms on the whole surface of counter substrate, so that opposed with pixel electrode 118.
On opposite electrode 108, apply opposed electrode voltage VLCCOM.Between pixel electrode 118 and opposite electrode 108, form memory capacitance 119, with the electrode stored charge that inserts and puts liquid crystal layer.In the example of Fig. 2 (a), between pixel electrode 118 and opposite electrode 108, form memory capacitance 119, but also can form between pixel electrode 118 and the ground-electrode GND or between pixel electrode 118 and the gate line etc.
In the structure shown in Fig. 2 (a), as transistor 116, owing to only use a channel-type, so for the polarity difference that does not lose the generating positive and negative voltage that transistor characteristic etc. causes need form biasing, but shown in Fig. 2 (b), if form the structure of P channel transistor and N channel transistor complementary combinations,, also can reduce the influence of polarity difference even so without bias voltage.But, in this complementary type structure,,, need two sweep trace 112a, 112b for one-row pixels 110 owing to need produce the signal of supplying with mutual repellency level as sweep signal.
By 130 pairs of each sweep traces 112 of scan line drive circuit described later supply with respectively sweep signal G1, G2 ..., Gm.According to each sweep trace, the transistor 116 that constitutes each sweep trace becomes conducting state, and thus, the picture signal of supplying with each data line 114 from data line drive circuit 140 described later is fed into pixel electrode 118.Change the state of orientation of the elements collection of liquid crystal 105 according to the potential difference (PD) between pixel electrode 9a that writes and the opposite electrode 21, carry out the modulation of light, can carry out tone and show.
In the present embodiment, as the driving method of liquid crystal 105, adopt a son driving.When in analog-driven, showing medium tone, so that the saturated following voltage of driving voltage (hereinafter referred to as the liquid crystal saturation voltage) of the transmitance of liquid crystal drives liquid crystal 105.Therefore, the transmitance of liquid crystal 105 roughly is directly proportional with driving voltage, can obtain the brightness picture that is directly proportional with driving voltage.
To this, son drives and only to make liquid crystal become through the driving voltage of state and become non-these two driving voltages of driving voltage that see through state, and the transmitance of liquid crystal is controlled in the combination of the driving voltage by each son field.Shown in Figure 8 as described later, in fact the brightness of picture is directly proportional with the integrated value of transmitance, but for the purpose of simplifying the description, and in the present embodiment, being directly proportional with the application time of driving voltage with the brightness of picture illustrates.
In the present embodiment, on time shaft, be divided into a plurality of sons field with 1.For example, shown in Fig. 6 (a), with 1 field interval (1f) approximate equality be divided into a plurality of sub-field period Sf1～Sf255, at each sub-field period, control the driving of liquid crystal.In Fig. 6, illustrate that to cut apart number be 255 example, but also 1 field interval (1f) can be divided into a plurality of sub-field period Sf1～Sfn.
The example of Fig. 6 for example is the tone data that shows all tones that will show on each pixel with 8 bits, and the tone number of demonstration is the situation of 256 tones, is the example that 1 field interval is divided into 255 sub-field period Sf1～Sf255.
Under the situation of carrying out the tone demonstration,,, carry out drive controlling and make each pixel become conducting state or cut-off state at each sub-field period Sf1～Sf255 according to the tone data of appointment.
In the present embodiment, as shown in Figure 6, in each son field, from beginning of sub-field period, making with the sub-field period of the corresponding number of tone becomes conducting state.
That is,, use pulse signal (pixel data) with pulse width suitable with 1 sub-field period Ts as the drive signal that is used to drive liquid crystal.And, suppose that the brightness that will show is the N brightness of 256 tones, so that pulse signal is only exported the time of N, i.e. (Ts * N) control.In other words, the pulse signal (drive signal) with pulse width suitable with a son Ts is controlled, it is just passable that only export N pulse signal the feasible zero hour from sub continuously.In each son field of 255, carry out writing of pulse signal (pixel data) for all pixels.Pulse signal is the binary signal of H (Continuity signal) or L (pick-off signal).
The following describes the electrical structure of electro-optical device.In Fig. 1, the electro-optical device of present embodiment comprises scan line drive circuit 130, data line drive circuit 140, clock generation circuit 150, timing signal generating circuit 200, data conversion circuit 300 and circuit for generating temperature compensated driving voltage 400.
The clock signal clk that clock generation circuit 150 produces as each several part Control work benchmark outputs to timing signal generating circuit 200.Timing signal generating circuit 200 is vertical scanning signal Vs, horizontal time-base Hs, Dot Clock signal DCLK and clock signal clks of supplying with according to illustrated high lift device never, generates the circuit of the various timing signals of following explanation or clock signal etc.
Timing signal generating circuit 200 generates AC signal FR, starting impulse DY, scan-side transmission clock CLY, data useful signal ENBX and output transmission clock CLX.AC signal FR is the signal that is used for data are write reversal of poles in per 1.Enabling signal DY is the pulse signal of regularly exporting with the beginning of each son field.Scan-side transmission clock CLY is the signal of the horizontal scanning of regulation scan-side (Y side).Data useful signal ENBX is that beginning is carried out the pulse signal that data transmit and determine each number of data lines certificate is outputed to the timing of pixel to data line drive circuit, with synchronous output of level transfer (that is, rise and descend) of scan-side transmission clock CLY.Data transmission clock CLX is regulation transmits a signal from the timing of data to data line drive circuit.
Circuit for generating temperature compensated driving voltage 400 generates the voltage V2 that produces sweep signal, offer scan line drive circuit 130, the voltage V1 of generation generation data line drive signal ,-V1, V0, offer data line drive circuit 104, generate opposed electrode voltage VLCCOM, be applied on the opposite electrode 108.
Voltage V1 is AC driving signal FR comes the high level signal of output cathode when being low level (hereinafter referred to as the L level) as benchmark with voltage V0 on the liquid crystal layer the voltage of data line drive signal, voltage-V1 be AC driving signal FR when being high level (hereinafter referred to as the H level) be the voltage of the data line drive signal of the benchmark high level signal that comes output negative pole with voltage V0 on the liquid crystal layer.
＜starting impulse generative circuit 〉
As mentioned above, in the present embodiment, on time shaft, be divided into a plurality of son Sf1～Sf255 with 1, in each son Sf1～Sf255, binary voltage be applied on the liquid crystal layer according to tone data.The switching of each son field is controlled by starting impulse DY.This starting impulse DY generates in the inside of timing signal generating circuit 200.
Fig. 3 is the circuit diagram that expression is built in the concrete structure of the starting impulse generative circuit that generates starting impulse DY in the timing signal generating circuit 200.
As shown in Figure 3, starting impulse generative circuit 210 by counter 211, comparer 212, traffic pilot 213, ring counter 214, d type flip flop 215, and OR circuit 216 constitute.
211 couples of clock CLK of counter count, and according to the output signal of OR circuit 216 count value are resetted.In the beginning on the scene, will make the reset signal RSET that becomes the H level during 1 cycle of clock CLK supply on the input terminal of OR circuit 216.Therefore, counter 211 is reset count value the zero hour on the scene at least.
Comparer 212 compares the count value of counter 211 and the output data value of traffic pilot 213, and when both were consistent, output became the consistent signal of H level.Traffic pilot 213 is according to the count results of the ring counter 214 that the number of starting impulse DY is counted, select output data Ds1, Ds2 ..., Ds255.Here, data Ds1, Ds2 ..., Ds255 be with each sub-field period Sf0, Sf2 shown in Figure 6 ..., data that Sf255 is respectively corresponding.
Detect the temperature of liquid crystal indicator or the temperature of liquid crystal indicator periphery with temperature sensor, according to detected temperatures, simultaneously according to the temperature characterisitic of liquid crystal, change data Ds1, Ds2 ..., the value of Ds255 also can.So, if change the length of a son Sf1 (1=1～255) according to the temperature characterisitic of liquid crystal, the variation that can follow environment temperature so changes the effective value of the voltage that liquid crystal is applied, so even temperature variation can guarantee that also the tone or the contrast that show are stable.
The count value of comparer 212 output counters is come since the consistent consistent signal of the output signal of traffic pilot with the division of expression.This unanimity signal feeds back to the reseting terminal of counter 211 by OR circuit 216, so counter 211 begins counting once more according to the division of son.D type flip flop 215 makes the output signal of OR circuit 216 and scan-side transmission clock CLY synchronous, generates starting impulse DY.
＜scan line drive circuit 〉
Scan line drive circuit 130 transmits the starting impulse DY of initial supply according to clock signal C LY, to each sweep trace 112 exclusively supply with successively sweep signal G1, G2, G3 ..., Gm.
＜data line drive circuit 〉
Data line drive circuit 140 carries out binary signal Ds after the n suitable with the bar number of data line 114 latch successively in certain horizontal scan period, the n that latchs binary signal Ds next horizontal scan period supply with simultaneously respectively corresponding data line 114 be used as data-signal d1, d2, d3 ... dn.
Fig. 4 is the block scheme of the concrete structure of the data line drive circuit 140 in the presentation graphs 1.As shown in Figure 4, data line drive circuit 140 is made of X shift register the 1410, the 1st latch cicuit the 1420, the 2nd latch cicuit 1430 and voltage selecting circuit 1440.
X shift register 1410 transmits the initial data useful signal ENBX that supplies with of horizontal scan period according to clock signal clk, as latch signal S1, S2, S3 ..., Sn comes exclusively to supply with successively.Then, the 1st latch cicuit 1420 latch signal S1, S2, S3 ..., Sn latchs in descending successively.Then, the 2nd latch cicuit 1430 latchs each binary signal Ds that is latched by the 1st latch cicuit 1420 simultaneously according to data useful signal ENBX, and by voltage selecting circuit 1440 to each data line 114 supply with data-signal d1, d2, d3 ..., dn.
Voltage selecting circuit 1440 according to the level of AC signal FR select with data-signal d1, d2, d3 ..., the dn correspondence voltage.For example, be under the situation of H level at AC signal FR, making certain pixel in output is under the situation of data-signal of conducting state, selects voltage-V1, and under the data-signal situation of output cut-off state, selects voltage V0.At AC signal FR is under the situation of L level, and it is under the data-signal situation of conducting state that output makes certain pixel, selects voltage V1, and under the data-signal situation of output cut-off state, selects voltage V0.
＜data conversion circuit 〉
As mentioned above, in a son driving, the brightness according to each pixel should show makes each pixel become conducting state or cut-off state in each sub-field period Sf1～Sf255.The data (hereinafter referred to as tone data) of the brightness that each pixel should need be shown convert to and are used for making pixel become the H level of conducting state or cut-off state or the binary signal Ds of L level at each sub-field period.
The data conversion circuit 300 of Fig. 1 is for this reason and the circuit that is provided with, and is suitable with control assembly.Data conversion circuit 300 is synchronoused working with vertical scanning signal Vs, horizontal time-base Hs and Dot Clock signal DCLK, tone data D0～D7 write field storer with 8 bits of each pixel correspondence, DY is synchronous with starting impulse, from the field memory sense data, tone data D0～the D7 of 8 bits read is transformed into binary signal Ds in each son of son Sf1～Sf255, Ds supplies with each pixel with this binary signal.
Data conversion circuit 300 need discern whether carry out the structure that writes in the current son in 1.Relevant this structure for example, can be discerned with following mode.Promptly, in the present embodiment, because AC driving, in per 1 field, generate the AC signal FR of counter-rotating, so in data conversion circuit 300 inside, be provided with starting impulse DY is counted, the level by AC signal FR shifts (rise or descend) next counter that this count results is resetted simultaneously, by result, can discern and carry out the current son field that writes with reference to this counting.
In the present embodiment, data conversion circuit 300 has for each pixel in order to realize with the tone (brightness) of the tone data D0～D7 appointment of 8 bits the pulse signal in the forward voltage of the first half output of the field interval pulse width suitable with each sub-field period, makes structure in the tone manifold.
And, field memory in the data conversion circuit 300 is set up two fields, the 1st field memory is the storer of the tone data (view data) that writes input, the 2nd storer is the storer that is stored in the tone data of each pixel that will be written to the 1st field memory before 1, in the 1st field memory, write tone data during, read the tone data of relevant each pixel from the 2nd field memory.
The detection that detects the temperature sensor of liquid crystal itself or neighboring liquid crystal temperature is input to data conversion circuit 300.Not shown temperature sensor is equivalent to temperature detection part, and data conversion circuit 300 is same as the impulse correction parts.
Data conversion circuit 300 is exported according to the detection of temperature sensor and is produced the control signal SC that is used to proofread and correct, feasible change be input to the data Ds1, the Ds2 that start the traffic pilot 213 in the generative circuit 210 ..., Ds255 value, and output to timing signal generating circuit 200.The output that timing signal generating circuit 200 can change starting impulse DY according to control signal SC regularly, can according to response speed of liquid crystal change change each son Sf1～Sf255 during.
Relevant above-mentioned binary signal Ds, the work of scan line drive circuit 130 and data line drive circuit 140 is exported synchronously, so to data translation circuit 300 is supplied with starting impulse DY, carried out the synchronous scan-side transmission clock CLY of horizontal scanning, regulation begins to carry out the timing that data transmit to the data line drive circuit data useful signal ENBX and data transmission clock CLX.
As mentioned above, in data line drive circuit 140, in certain horizontal scan period, after latching binary signal the 1st latch cicuit 1420 dot sequencies, in next horizontal scan period, from the 2nd latch cicuit 1430 with data d1, d2, d3 ..., dn supplies with each data line 114 simultaneously, so the relatively work of scan line drive circuits 130 and data line drive circuit 140 of data conversion circuit 300 is exported binary signal Ds with the timing of 1 horizontal scan period in front.
＜work 〉
The following describes the work of the electro-optical device of the foregoing description.Fig. 5 is the timing diagram of this electro-optical device work of explanation.
AC signal FR is the signal that carries out the level counter-rotating in each field interval (1f).When starting impulse DY results from the beginning of each son Sf1～Sf255.AC signal FR become the L level during in (1f), if supply with starting impulse DY, transmit by the clock signal C LY in the scan line drive circuit 130 (with reference to Fig. 1) so, thus with sweep signal G1, G2, G3 ..., Gm during exclusiveness output successively in (t).In the present embodiment, be divided into 2255 with 1 basically, each son field becomes equal time width, but the temperature variation around also with good grounds liquid crystal itself or the liquid crystal changes the situation of each sub-field period.Therefore, can with during (t) set than the shortest sub-field period shorter during.
Sweep signal G1, G2, G3 ..., Gm has the pulse width suitable with the semiperiod of clock signal C LY respectively, from the sweep signal G1 of the 1st sweep trace 112 correspondences of last number after having supplied with starting impulse DY, rise at first from clock signal C LY, the semiperiod that is delayed clock signal C LY at least exports.Therefore, from supplying with starting impulse DY, to output scanning signal G1,1 clock (G0) of data useful signal ENBX is fed into data line drive circuit 140.
Now, suppose to supply with this data useful signal ENBX of a clock (G0).When this data useful signal ENBX of a clock (G0) supplies to data line drive circuit 140, by transmission according to the clock signal C LX of data line drive circuit 140 (with reference to Fig. 4), latch signal S1, S2, S3 ..., Sn exclusively exported successively in horizontal scan period (1H).Latch signal S1, S2, S3 ..., Sn has the pulse width suitable with the semiperiod of clock signal C LX respectively.
At this moment, the 1st latch cicuit 1420 of Fig. 4 is in latch signal S1 descends, to from the 1st sweep trace 112 of last number with from the voltage V0 of the picture L level of the intersection correspondence of the 1st data line 114 of left number.
So, in the electro-optical device of present embodiment, each pixel of a plurality of pixels being carried out tone when showing, control by data conversion circuit 300, make the pulse signal of the forward voltage (V1) that applies on each pixels of a plurality of pixels concentrate on the first half of field interval.
Then, repeat same work later on, until the output sweep signal Gm corresponding with m sweep trace 112.Promptly, 1 horizontal scan period (1H) certain sweep signal Gi of output (i is the integer that satisfies 1≤i≤m), when writing the 1 row pixel 110 corresponding and writing data-signal d1～dn, carry out latching successively simultaneously to the binary signal Ds of the 1 row pixel 110 corresponding with the sweep trace 112 of (i+1) with the 1st sweep trace 112.The data-signal that writes in the pixel 110 is held, writing in descending height field Sf2.
Below repeat same work, the each supply stipulated the starting impulse DY that each sub-field period begins.
And, after through 1,, in each son field, also repeat same work even be inverted at AC signal FR under the situation of H level.
Below, the comparison of per 1 pixel data in son each pixel that produces of said structure being write fashionable duty and conventional example is described.Figure 10 represents that pixel data that existing analog-driven produces writes the relation between the variable condition (Figure 10 (B)) of liquid crystal drive voltage waveform (Figure 10 A) in fashionable each and the liquid crystal transmitance in each.
In Figure 10, among f1 on the scene, the f2, in two fields, alternately apply the positive and negative aanalogvoltage V01 corresponding with tone D1 ,-V01 so that obtain tone (brightness) D1 show.Here, among the f2 on the scene, with tone when tone D1 is altered to than the high tone D2 of tone D1, in these two fields of whole f3, f4 to this pixel apply the level corresponding with tone D2 driving voltage V02 ,-V02, but because liquid crystal has the limited response time, so can not reach tone D2 immediately, among the 3rd field f5, become tone D2 from the switching of tone as target.
On the contrary, in an embodiment of the present invention, the time ratio in and cut-off voltage interval interval, be that duty ratio carries out the tone demonstration with the forward voltage in drive to produce by son 1, but in this case, make interval concentrate on the first half of each field interval by control, so can improve the optical response of liquid crystal with forward voltage.
Fig. 8 represents that a binary signal Ds who drives element 110 between the variable condition (Fig. 8 (B)) of liquid crystal drive voltage waveform (Fig. 8 (A)) in when writing pixel data each and the liquid crystal transmitance in each by son latchs, then, in the decline of latch signal S2, to latching from the 1st sweep trace 112 of last number with from the binary signal Ds of the pixel 110 of the intersection correspondence of the 1st data line 114 of left number, below, equally to latching from the 1st sweep trace 112 of last number with from the binary signal Ds of the pixel 110 of the intersection correspondence of n data line 114 of left number.
Thus, at first,, intersect the binary signal Ds of corresponding 1 row pixel with the 1st sweep trace 112 and latched successively by the 1st latch cicuit 1420 according to Fig. 1.Much less, what data conversion circuit 300 contrast the 1st latch cicuit 1420 produced latchs regularly, generates output and each corresponding binary signal Ds in son field successively according to the tone data D0～D7 of each pixel.
Then, clock signal C LY descends, and during output scanning signal G1, selects among Fig. 1 to make the transistor 116 of these sweep trace 112 pairing pixels 110 become complete conducting state from the result of the 1st sweep trace 112 of last number.
On the other hand, the decline by this clock signal C LY comes output data useful signal ENBX.Then, in the decline of this data useful signal ENBX regularly, the binary signal Ds that the voltage selecting circuit 1440 of the 2nd latch cicuit 1430 by each corresponding data line 114 will be latched successively by the 1st latch cicuit 1420 as data-signal d1, d2, d3 ..., dn supplies with simultaneously.Thus, from the 1st row pixel 110 of number, carry out simultaneously data-signal d1, d2, d3 ..., the writing of dn.Carrying out when this writes, in the 1st latch cicuit 1420, latching successively among Fig. 1 with the 2nd sweep trace 112 and intersects the binary signal Ds of 1 corresponding capable pixel from number.
Here, the tone data D0～D7 that supposes certain pixel is ' 00000010 ' the tone data that a dark side the from the 0th to the 255th 256 tones shows the 3rd tone (brightness) (hereinafter referred to as the 2nd tone).For the brightness of the 2nd tone that obtains appointment, make the pixel conducting of two sons in 255 sons just passable.And, in the present embodiment, in this case, as shown in Figure 7, from two sons of the beginning of field interval, promptly each interval of son Sf1, Sf2, as the binary signal of supplying with pixel, the voltage V1 of H level is represented in output, for other son Sf3～Sf255, represent that from voltage selecting circuit 1440 outputs the voltage V0 of L level is used as data-signal.
For example, the tone data D0～D7 that supposes certain pixel is the tone data of the 3rd tone ' 00000010 '.In this case, for the brightness of the 3rd tone that obtains appointment, in each interval of son Sf1, Sf2, Sf3, as the voltage V1 of binary signal output expression H level, among each son Sf4～Sf255, export the relation of expression at other from voltage selecting circuit 1440.In Fig. 8, a plurality of sub-field periods that apply forward voltage are continuously represented that by 1 pulse pulse width is corresponding with the sub-number of fields order that becomes conducting.In Fig. 8 (A), the level V1 of the pulse-like voltage that applies on the pixel in each son ,-V1 is chosen as about 1～1.5 times of liquid crystal saturation voltage Vsat.This be because the rising in the liquid crystal response characteristic roughly with pixel on the voltage level that applies proportional so that improve the response characteristic of liquid crystal.In addition,, the signal of gating pulse shape concentrates first half on the scene, so, can quickly respond to for the switching of field owing to making.
On the other hand, changing under the situation of tone with the opposite direction that rises, applying of Continuity signal according to showing tone, finish to make the field to finish midway owing on the scene, promptly when next beginning, owing to becoming the state that on liquid crystal, does not apply electric field, so in this case, compare with current driving mode, also can obtain good response characteristic.
In Fig. 8, among f1 on the scene, the f2, for the tone D1 that obtains show, with the state that concentrates on the first half of each in whole two fields apply the pulse width PA corresponding with tone D1 voltage V1 ,-V1, can obtain tone D1 as target.Here, among the f2 on the scene, when changing to from tone D1 than the high tone D2 of tone D1, among f3 on the scene, f4, the f5, with the state of the first half that concentrates on each apply the pulse width PB corresponding with tone D2 voltage V1 ,-V1.In this case, changing to the process of tone D2 from tone D1, passed through from field f2 two fields the field f4, can reach target transmitance, be tone D2.
Among the f5 on the scene, when tone D2 changes to tone D1, equally at the tone D1 that from the field 7 of 2 of field f5 to the, is changed to target smoothly.Here, the transmitance that obtains tone D1, D2 routine in the past identical with shown in Figure 10 (B) in fact.
So, electro-optical device according to present embodiment, owing to comprise pixel, scan line drive circuit, data line drive circuit and control assembly, so can shorten the response time that reaches as the target transmitance in the liquid crystal of the electrooptical material that constitutes pixel, realize high-speed response, its result, can improve image quality, wherein, pixel comprises with each of a plurality of sweep traces and a plurality of data lines and intersects the pixel electrode of corresponding configuration, be controlled at the on-off element that applies voltage on each described pixel electrode, and the electrooptical material that in the intersection region of described a plurality of data lines and a plurality of sweep traces, inserts and puts and with the opposite electrode of described pixel electrode arranged opposite; Scan line drive circuit is divided into a plurality of sons field with each in 1, will make the sweep signal of described on-off element conducting supply with described each sweep trace in giving each son field of a plurality of sons field; Data line drive circuit described sweep signal is supplied on each respective pixel corresponding scanning beam during, will make each pixel carry out that white shows or the binary signal of black display supplies to and this pixel corresponding data line according to the tone data forward voltage by indicating each pixel or cut-off voltage in each son; And control assembly is controlled the data line drive circuit, makes the pulse signal as forward voltage that applies on each pixels of described a plurality of pixels concentrate on described first half.
In the electro-optical device of present embodiment, under the situation of show events image, when carrying out the switching of field, under the situation that changes displaying contents, by according to showing that tone changes the pulse width as the pulse signal of forward voltage of the field of switching according to the direction that changes picture brightness, can improve the response characteristic of liquid crystal.
In illustrating that with reference to Fig. 9 carrying out the field under show events image situation switches, the son that passes through that changes under the displaying contents situation drives and to carry out pixel data and write control.Fig. 9 (A) expression drives by son to be carried out pixel data and writes liquid crystal drive voltage waveform in fashionable each, and Fig. 9 (B) represents the variable condition of the liquid crystal transmitance in each.
In these figure, the voltage V1 of output pulse width PA among f1 on the scene, the f2 ,-V1, obtain tone D1 as target.From field f2 shows up f3, changing displaying contents, suppose picture brightness, be that tone is changed into tone D2 from tone D1.So under the situation that high direction changes, pulse-width is proofreaied and correct at the tone of picture, so as with compare the increase pulse width as the pulse width of the corresponding benchmark of tone.For example, suppose that the pulse width as benchmark corresponding with tone D1, D2 is respectively PA, PB.Suppose to change under the situation of tone D2 from tone D1 among the f3 that shows up from field f2, among the f3 on the scene, the pulse width of the voltage V1 that applies on the pixel is PB * 1.3 (=PB ').
Changing displaying contents from field f5 shows up f6, tone changes to from tone D2 under the situation of tone D1, promptly at the tone of picture under the situation that low direction changes, pulse-width is proofreaied and correct, and makes that the pulse width as benchmark corresponding with tone diminishes.For example, changing under the situation of tone D1 from tone D2 from field f5 shows up f6, supposing among the f6 on the scene, the pulse width of the voltage-V1 that applies on the pixel is PA * 0.7 (=PA ').
Like this,, change under the tone situation of picture, also can obtain in all, to obtain as the tone of target, promptly as the transmitance of target even changing displaying contents.
In this case, in the data conversion circuit 300 of Fig. 1, each pixel is calculated the difference of the tone data between tone data of reading in the current just field memory from read and the tone data of from the field memory of storing preceding 1 tone data, reading two, according to this result proofread and correct each pixel on the direction of tonal variation tone data, be the pulse width of the pulse voltage that applies in each pixel midfield.Its result proofreaies and correct the time width of tonal variation part on the picture, proofreaies and correct in as a whole 1, so that the pulse width that becomes to concentrate and to be applied to the voltage of first half is the tone (transmitance) of target.
Electro-optical device according to present embodiment, data conversion circuit 300 (control assembly) carries out under the situation of show events image in the switching of field, under the situation that changes displaying contents, the direction that changes according to picture brightness changes the described pulse width of switching the pulse signal that becomes described forward voltage in the field, so can make the brightness of picture reach the tone of expectation rapidly in the direction that changes, can improve as the response characteristic in the liquid crystal of the electrooptical material that constitutes pixel, can improve image quality.
And, in the electro-optical device of present embodiment, in each, change pulse width by change as the liquid crystal of electrooptical material itself or according to liquid crystal temperature on every side, also can improve the deterioration of the tone characteristic that the temperature variation of liquid crystal causes as the pulse signal of described forward voltage.
As mentioned above, except present embodiment, detect liquid crystal itself or liquid crystal temperature on every side by temperature sensor as temperature detection part, according to the detection of this temperature sensor output, by the pulse width that in each, changes predefined pulse signal as described forward voltage as the data conversion circuit of pulse width correcting unit according to tone.
That is, when the temperature of liquid crystal raise, the optic response of liquid crystal speeded up, and on the contrary, during the temperature step-down of liquid crystal, above-mentioned response speed is slack-off.Therefore, in the present embodiment, under the temperature of the liquid crystal situation higher than reference temperature, widen pulse width as the pulse signal of forward voltage, promptly widen width, and under the temperature of the liquid crystal situation lower, the pulse width as forward voltage is narrowed down than reference temperature as the sub-field period of forward voltage, the output timing of the starting impulse DY of sub-field period is stipulated in i.e. change, so that make the narrowed width as the sub-field period of forward voltage.
The control signal SC that data conversion circuit 300 will be used to proofread and correct outputs to timing signal generating circuit 200, so as according to the detection of the temperature sensor that detects liquid crystal itself or liquid crystal environment temperature export change the traffic pilot 213 that is input in the starting impulse generative circuit 210 with son field Sf1, Sf2 ..., the Sf255 correspondence data Ds1, Ds2 ..., Ds255 value.
Its result, according to the temperature variation of liquid crystal, be response speed of liquid crystal change each son Sf1, Sf2 in the field ..., Sf255 time width.
So, electro-optical device according to present embodiment, according to the pulse width that changes as the temperature around the liquid crystal of described electrooptical material itself or this liquid crystal in each as the pulse signal of described forward voltage, so liquid crystal as electrooptical material, even because of the temperature around liquid crystal itself or the liquid crystal changes response speed, also can make the tone stability of characteristics, can improve the tone characteristic degradation that temperature variation causes, can improve image quality.
And, in the electro-optical device of above-mentioned present embodiment, also can make the last son field in the field become black display.The reason of saying so is, in the electro-optical device of above-mentioned present embodiment, according to tone data, have each son Sf1, Sf2 in all ..., Sf255 becomes the situation of forward voltage.Under such situation, in order to improve the repeatability of live image, except obtaining electric field with as quickly as possible timing from liquid crystal layer, the purpose effect of present embodiment can reduce by half.Below the embodiment of this problem is avoided in explanation.
In the above-described embodiments, the field is divided into 255 sons, become son Sf1, Sf2 ..., Sf255.Here, for example, be divided into 300 sons with 1, become son Sf1, Sf2 ..., Sf300.The data conversion circuit 300 of control assembly in a son of cutting apart, son Sf1, Sf2 ..., among the Sf255, as above-mentioned embodiment, show tone.On the other hand, son Sf256～Sf300 does not offer actual tone and shows, controls must carry out black display.Perhaps, data conversion circuit 300 as a son field with 46 sub-field lengths, is controlled son Sf256～Sf300 for sub with these 46 sub-field lengths must carry out black display.
By such control, can make the last son field in the field carry out black display.So, be inserted in each by the son field that will show black, though the tone of bright side do not show constantly, also can easily improve the visibility of live image.
The display mode of the electro-optical device of the foregoing description has been described as common black display.Display mode at electro-optical device is under the situation of ordinary white demonstration, if the structure identical with said structure so just can be suitable for.But, in this case, need the signal condition of conversion and control above-mentioned ' forward voltage (conducting state) ' and ' cut-off voltage (cut-off state) '.
Figure 11 represents the block scheme of the electro-optical device of the present invention the 2nd embodiment.In Figure 11, attached with same numeral and omission explanation to the component parts identical with Fig. 1.
In the 1st embodiment, displayable tone is restricted to the number of the son field of cutting apart.To this, present embodiment is compared with the sub-number of fields order of cutting apart, and can fully increase displayable tone number.
Also adopt a son driving in the present embodiment.In the present embodiment, shown in Figure 16 (a), suppose with 1 approximate equality be divided into an a plurality of son Sf1～Sf32 and use.
In the present embodiment, in each son,, the son of conducting state is concentrated, controlled, show than the much more tone of sub-number of fields order by making wherein part become conducting state from the first half of field according to tone.Promptly, the tone that shows is beginning from the field by utilizing under N the son situation about showing, control, make in zero hour from the field is during N pulse signal of output that (Ts * N) can export the pulse signal that has with the corresponding pulse width of time T s of sub-field intermittently.
In the present embodiment, as the drive unit of electro-optical device, for example hypothesis is used pSiTFT (multi-crystal TFT).The number of son field is assumed to be 32 as mentioned above.The sweep frequency of current driving mode is 60Hz, but in the present embodiment, this means that (60 * 32Hz) carry out picture scanning with its 32 times.
The electrical structure of the electro-optical device 100 of present embodiment is shown in Figure 11.The concrete structure of pixel 110 is identical with Fig. 2 (a).Transistor 116 as the on-off element of Fig. 2 (a) adopts pSiTFT.
In the present embodiment, also memory capacitance 119 is formed between pixel electrode 118 and the opposite electrode 108, but also can be formed between pixel electrode 118 and ground-electrode GND or between pixel electrode 118 and gate line etc.In configuration of device substrate side and the wiring that opposed electrode voltage VLCCOM has same potential, also can form betwixt.
Timing signal generating circuit 201 generates polarity inversion signal FR, sweep-initiating pulse DY, scan-side transmission clock CLY, data useful signal ENBX, data transmission clock CLX, data transmission starting impulse DDS, sub-field identification signal SF according to timing signals such as the vertical synchronizing signal Vs, the horizontal-drive signal Hs that supply with from high lift device (not shown), Dot Clock signal DCLK.The function of each signal below is described.
Polarity inversion signal FR is the signal that makes reversal of poles in per 1.Sweep-initiating pulse DY is pulse signal of each son initial output, by this signal is input to scan line drive circuit 401, scan line drive circuit 401 output grid impulses (G1～Gm).Scan-side transmission clock CLY is the signal of the sweep velocity of regulation scan-side (Y side), and above-mentioned grid impulse and this transmission clock are delivered to each sweep trace synchronously.Data useful signal ENBX is that decision is exported Horizontal number of pixels purpose timing signal with the data parallel that is stored in the X shift register 510 in the data line drive circuit 500.Data transmission clock CLX is the clock signal that is used for transmitting to data line drive circuit 500 data.It is that regulation is carried out the timing pip that data transmit from 301 beginnings of digital coding electricity to data line drive circuit 500 that data transmit starting impulse DDS, delivers to digital coding circuit 301 from timing signal generating circuit 201.Sub-field identification signal SF is to be which is felt the pulse towards the signal of notification data coding circuit 301 with this pulse (son).
The electro-optical device of present embodiment writes the data of H level or L level in each son Sf1～Sf32, so that make pixel be in conducting state or cut-off state according to tone.Data presented is input to digital coding circuit 301 from outside (not shown), as the numerical data of 8 bits.Digital coding circuit 301 according to the rules rule in each son is binary data with these data conversions, so that can be sent to data line drive circuit 500.Therefore, transmissible data are temporarily stored in the field memory 310, at any time conversion process.After the input data transmitted starting impulse DDS, the video data of binarization and data transmission clock CLX were synchronous, are sent to data line drive circuit 500.
Here, digital coding circuit 301 is when carrying out binarization to video data, and needs identification is which the son field in 1.In the present embodiment, 201 couples of sweep-initiating pulse DY of timing signal generating circuit count, and its result is exported to digital coding circuit 301 as sub-field identification signal SF.The instrumentation of sweep-initiating pulse DY carries out between 0～31, can be reset by the vertical synchronizing signal from the outside input.Digital coding circuit 301 comes the recognin field according to this sub-field identification signal SF.
Digital coding circuit 301 is in order to realize the tone of appointment in each pixel, according to the tone that shows, basically as mentioned above, concentrating first half on the scene to assign to export as the pulse signal of forward voltage, making a part of voltage in concentrating on the voltage of first half is cut-off voltage.
And the field memory 310 in the digital coding circuit 301 is provided with the capacity of the video data of two amounts of storage.Here, the 1st field memory is the storer that writes from the video data of outside input, and the 2nd field memory is the storer that is stored in the video data of previous field input.Field memory 310 is during writing the video data that is input to the 1st field memory from the outside, and digital coding circuit 301 visits the 2nd field memory is read the video data of each pixel.The 1st field memory and the 2nd field memory act on every in exchange.
The control one of the son field in the digital coding circuit 301 is illustrated in Figure 16 (b).In the figure, blackboard is represented the son field of the forward voltage that white shows.Carry out the son control of concentrating first half on the scene that white shows in will be used for shown in the 1st embodiment, as shown in this embodiment, 1 is being divided under the situation of 32 sons, displayable tone only is 0～32 these 33 tones.Here, will for example be called ' basic 12 tones ' with the displayable tone of method (brightness) shown in the 1st embodiment, and will under the control of present embodiment, for example be called ' basic 12 tones+1 tone ' by displayable tone (brightness).
For example, under the tone situation that shows ' key colour+2 tones ', shown in Figure 16 (b), in each interval of son Sf1～Sf9 and Sf13, the data-signal of output expression conducting state, in each interval of son Sf10～Sf12 and Sf14～Sf32, the data-signal of output expression cut-off state.Under the tone situation that shows ' basic 12 tones+5 tones ', shown in Figure 16 (b), in each interval of son Sf1～Sf3 and Sf5～Sf13, the data-signal of output expression conducting state, in the son field of a son Sf4 and Sf14～Sf32, the data-signal of output expression cut-off state.
In the present embodiment, the liquid crystal transmitance under the control situation shown in Figure 16 (b) ' basic 12 tones+3 tones ' is shown in Figure 13.As shown in the drawing, form cut-off voltage by a part that makes son that white shows and reduce transmitance, its result, the integrated value of the transmitance of expression brightness is littler than the part formation cut-off voltage situation of the son that makes display white.According to such principle, can increase the tone number.
In Figure 11, scan line drive circuit 401 transmits the sweep-initiating pulse DY of initial supply according to scan-side transmission clock CLY, exclusively supplies with each sweep trace 112 successively, as sweep signal G1, G2, G3 ..., Gm.
Data line drive circuit 500 latchs binary data the n corresponding with the bar number of data line successively in certain horizontal scan period after, with n the binary data that latchs supply with simultaneously each corresponding data line 114 be used as data-signal d1, d2, d3 ..., dn.
The concrete structure of data line drive circuit 500 is described with reference to Figure 14 here.Data line drive circuit 500 is made of the 1st latch cicuit the 520, the 2nd latch cicuit 530 of X shift register 510, horizontal pixel, the booster circuit 540 of horizontal pixel.
Wherein, X shift register 510 transmits the data useful signal ENBX that regularly supplies with the beginning of horizontal scan period according to clock signal C LX, as latch signal S1, S2, S3 ..., Sn exclusively supplies with successively.Then, the 1st latch cicuit 520 with binary data latch signal S1, S2, S3 ..., Sn decline in latch successively.Then, the 2nd latch cicuit 530 latchs each binary data that the 1st latch cicuit 520 latchs in the decline of data useful signal ENBX simultaneously, simultaneously by booster circuit 540 supply with each data lines as data-signal d1, d2, d3 ..., dn.
Booster circuit 540 has reversal of poles function and boost function.Booster circuit 540 boosts according to polarity inversion signal FR.Illustrate booster circuit 540 work be illustrated in Figure 12.For example, be in the situation of L level at polarity inversion signal FR, be input at the data-signal that makes certain pixel become conducting state under the situation of booster circuit 540, export positive liquid crystal drive voltage.At polarity inversion signal FR is under the situation of H level, in input certain pixel is become under the situation of conducting state, the liquid crystal drive voltage that output is negative.Pixel is become under the data cases of cut-off state, output VLCCOM current potential, and irrelevant with the state of polarity inversion signal FR.
The following describes the work of the electro-optical device of the 2nd embodiment.Figure 15 is the timing diagram of this electro-optical device work of explanation.
At first, polarity inversion signal FR is the signal that carries out the level counter-rotating in per 1 (1f).On the other hand, sweep-initiating pulse DY is supplied with when the beginning of each son Sf1～Sf32 simultaneously.
Here, at polarity inversion signal FR is among 1 (1f) of L level, after supplying with sweep-initiating pulse DY, by the transmission of the scan-side transmission clock CLY in the scan line drive circuit 410, sweep signal G1, G2, G3 ..., Gm during (t) successively exclusively output.In the present embodiment, as mentioned above, carry out 32 five equilibriums with 1, each son field becomes equal time width.
This sweep signal G1, G2, G3 ..., Gm has respectively and the suitable pulse width of semiperiod of scan-side transmission clock CLY, from the 1st sweep trace 112 pairing sweep signal G1 of last number after supplying with sweep-initiating pulse DY, after the initial rising of the clock CLY that scan-side transmits, the semiperiod of the transmission clock of delaying sweep side at least CLY and output.Therefore, after supplying with sweep-initiating pulse DY, before output scanning signal G1, initial 1 clock (G0) of data useful signal ENBX is fed into data line drive circuit 500.
The situation of initial 1 clock (G0) of supplying with this data useful signal ENBX at first, is described.After 1 clock (G0) of this data useful signal ENBX supplied to data line drive circuit 500, by the transmission of data transmission clock CLX, latch signal S1, S2, S3 ..., Sn exclusively exported in horizontal scan period (1H) successively.Latch signal S1, S2, S3 ..., Sn has respectively and the suitable pulse width of semiperiod of data transmission clock CLX.
At this moment, the 1st latch cicuit 520 of Figure 14 is in latch signal S1 descends, will be to latching from the 1st sweep trace 112 of last number with from the binary data of the pixel 110 of the intersection correspondence of the 1st data line 114 of left number, then, in the decline of latch signal S2, will be to latching from the 1st sweep trace 112 of last number with from the binary data of the pixel 110 of the intersection correspondence of the 2nd data line 114 of left number, below, similarly, will be to latching from the 1st sweep trace 112 of last number with from the binary data of the pixel 110 of the intersection correspondence of the n data line 114 of left number.
Thus, at first, in Figure 11, latch successively by the 1st latch cicuit 520 from intersecting the binary data of corresponding 1 row pixel with top the 1st sweep trace 112.Much less, digital coding circuit 301 latchs regularly according to the 1st latch cicuit 520, generates successively from the video data of each pixel and exports and each son corresponding binary data.
Then, in clock signal C LY descends, during sweep signal G1 output, in Figure 11, select, make with this sweep trace 112 and intersect the transistor 116 complete conductings of corresponding pixel 110 from the result of the 1st sweep trace 112 of number.
On the other hand, output data useful signal ENBX (G1) once more in the decline of this clock signal C LY regularly.Then, in the rising of this signal regularly, the binary data that the 2nd latch cicuit 530 latchs the 1st latch cicuit 520 successively by booster circuit 540 supply with simultaneously each corresponding data line 114 be used as data-signal d1, d2, d3 ..., dn.Thus, from the 1st row pixel 110 of number, carry out simultaneously data-signal d1, d2, d3 ..., the reading of dn.
Write simultaneously with this and to carry out, in Figure 11 with intersect the binary data of 1 corresponding row pixel from top the 2nd sweep trace 112 and latch successively by the 1st latch cicuit 520.
So, in the electro-optical device of present embodiment, when in each pixel of a plurality of pixels, carrying out the tone demonstration, make the pulse signal that applies on each pixel of a plurality of pixels concentrate first half on the scene as forward voltage, and, according to the tone that shows, control by digital coding circuit 301, make and will export as cut-off voltage as the part of the pulse signal of forward voltage.
Then, repeat later on work simultaneously, until the corresponding sweep signal Gm of output and m sweep trace 112.Before being written to data-signal in the pixel 110 writing in remaining to down height field Sf2.
Below, in the sweep-initiating pulse DY that each supply rule stator field begins, repeat same work.
In said structure, the example shown in Figure 16 (b) is such, and the brightness experimental data of carrying out the electro-optical device of the use pSiTFT under the white demonstration situation at Zi Chang is shown in Figure 17.In Figure 17, the situation of ' basic 12 tones ' in the information slip diagrammatic sketch 16 (b) of ' 12-0 ' of so-called transverse axis for example, the situation of ' basic 12 tones+5 tones ' in the information slip diagrammatic sketch 16 (b) of so-called ' 12-5 '.From the experimental result of Figure 17 as can be known, by the such driving of an example shown in Figure 16 (b), between basic 12 tones (brightness) and basic 13 tones (brightness), can show 7 tones.
Here, acquisition only is shown carries out the figure example that the white color harmony antithetical phrase field Sf1～Sf13 that shows carries out carrying out between the white tone that shows the tone of interpolation gained at antithetical phrase field Sf1～Sf12, even but between other color harmony tones, carry out under the situation of interpolation, by carrying out and the same control of Figure 16 (b), can show the tone between a son M and the M+1.
Here, under the tone situation that shows between a son M and the M+1, in the conducting pulse (son field) that continuous the carrying out white that disposes shows, except white demonstration beginning pulse, by making white show that near the pulse beginning (son) ends, can obtain more tone near the M tone.Here, so-called white is to carry out the field to switch near showing beginning, from applying of white shows signal, in the time in the transfer process that in the shorter time, promptly responds than the optical response time of display element (being liquid crystal in the present embodiment).
In conducting pulse that the carrying out white of continuously configuration shows (son), except showing, white finishes pulse, show that by making white near pulse finishing (son) ends, also can obtain more tone near the M tone.Here, so-called white shows near the end, under the situation that shows the M+1 tone, is to show from finishing white, in the time of the optical response time that passes up to display element (being liquid crystal in the present embodiment).
By pulse is in addition ended, can obtain more tone near the M+1 tone.
By from above-mentioned, selecting suitable combination, can obtain necessary tone.
In above-mentioned present embodiment, drive unit is pSiTFT, but is not limited thereto.The present invention can be applied to have and the similar structure of said structure, and in the display element (being liquid crystal in the present embodiment) of electro-optical device, the optical response time of display element is longer than the time of son field, or has the situation of the optical response approaching with it.As such electro-optical device, the projector that utilizes the liquid crystal light valve of pSiTFT to constitute as drive unit is for example arranged, use the direct view liquid crystal display device (direct viewing type LCD) of α TFT or TFD etc. as drive unit.Relevant these structures are with aftermentioned.
Here, whether the display element of the electro-optical device that adopts in the checking present embodiment has above-mentioned optical response.
In above-mentioned present embodiment, in the frame rate of 60Hz, be divided into 32 driving pulses (son field).The relatively length and the response speed of liquid crystal of the unit pulse under this situation.
Unit pulse=about 0.5 (msec) of 1 ÷, 60 ÷ 32=
Response speed of liquid crystal (TN liquid crystal typical value)=about 5 (msec)
So the unit pulse time of present embodiment is very short pulse with respect to response speed of liquid crystal, so the electro-optical device of present embodiment is effective.
The display mode of the electro-optical device of the foregoing description is that common black illustrates.Display mode at electro-optical device is under the situation of ordinary white, if the structure identical with said structure also can be used.But, in this case, need the signal of ' forward voltage (conducting state) ' and ' cut-off voltage (cut-off state) ' of switching controls in above-mentioned.
The one-piece construction of＜liquid-crystal apparatus 〉
Below, the structure of the electro-optical device of the foregoing description or application examples is described with reference to Figure 18 and Figure 19.Here, Figure 18 is the planimetric map of the structure of expression electro-optical device 100, and Figure 19 is the sectional view of the A-A ' line among Figure 18.
As shown in these figures, electro-optical device 100 has the device substrate 101 that formed pixel electrode 118 grades, has formed the counter substrate 102 of opposite electrode 108 etc., keeps the certain clearance bonding to insert and put structure as the liquid crystal 105 of electrooptical material simultaneously in this gap by sheeting 104 each other.In fact, on sheeting 104, notch portion is arranged, after enclosing liquid crystal 105, seal by encapsulant, but these have been omitted in the drawings by this part.
For example vertical alignment layer and dielectric constant anisotropy are constituted liquid crystal board for negative liquid crystal material makes up, by will with see through axle respectively two polarization plates of deviation 90 degree configurations insert and put the liquid crystal indicator that these liquid crystal boards obtain the such common black display mode of present embodiment.
Certainly, also can use the TN mode liquid crystal of ordinary white display mode, but in this case,, in will obtaining the son field of black display, make voltage become conducting state and drive just passable if in wanting the son field of display white, make voltage become cut-off state.
Counter substrate 102 is transparency carriers that glass etc. constitutes.In the above description, device substrate 101 is recorded and narrated and is the transparency carrier formation, but under the situation of the electro-optical device of reflection-type, also can be semiconductor substrate.In this case, because semiconductor substrate is opaque, so pixel electrode 118 is formed by reflective metal such as aluminium.
In device substrate 101, in the exterior lateral area of the inboard of sheeting 104 and viewing area 101a, photomask 106 is set.In the zone that forms this photomask 106, in regional 130a, form scan line drive circuit 130, and in regional 140a, form data line drive circuit 140.
That is, photomask 106 prevents that light from inciding on the driving circuit that forms in this zone.In this photomask 106, has the structure of coming together to apply opposed electrode voltage VLCCOM with opposite electrode 108.
In device substrate 101, the regional 140a outside forming data line drive circuit 140 in the zone 107 that sheeting 104 separates, forms a plurality of splicing ears, becomes input from the control signal of outside or the structure of power supply.
On the other hand, the opposite electrode 108 of counter substrate 102 by at least one local conductive material (not shown) that is provided with, is realized conducting of photomask 106 in the device substrate 101 and splicing ear in four jiaos of substrate bonding part.That is, opposed electrode voltage VLCCOM is applied on the photomask 106 by the splicing ear that is provided with in device substrate 101, and is applied on the opposite electrode 108 by conductive material.
In counter substrate 102, according to the purposes of electro-optical device 100, for example if direct viewing type, so the 1st, the color filter of arranging with striated, zyklopisch, triangular shape etc. is set, the 2nd, metal material or resin etc. for example are set constitute photomask (black matrix).Under the purposes situation of coloured light modulation, for example,, do not form color filter as under the light valve situation of projector described later.Under the situation of direct viewing type, whether according to needs light shine electro-optical device 100 from counter substrate 102 sides or device substrate side and are provided with.In addition, during the electrode of device substrate 101 and counter substrate 102 forms, the alignment films (not shown) of polishing etc. is set on the direction of regulation respectively, the regulation no-voltage applies the direction of orientation of the liquid crystal molecule in the state, and, the polariton (not shown) corresponding with direction of orientation is set in counter substrate 102 sides.Wherein,,, do not need the result of described alignment films or polariton so if use the polymer dispersion type liquid crystal of disperse particles in macromolecule as liquid crystal 105, because the raising of light utilization ratio, so help high brightness or low consumpting power etc.
＜electronic equipment 〉
Below, be that example illustrates above-mentioned liquid-crystal apparatus with concrete electronic equipment.
＜projector 〉
At first, the projector that the electro-optical device of embodiment is used as light valve is described.Figure 20 is the planimetric map of this projector structure of expression.As shown in the drawing, in projector 1100 inside, along systematic optical axis PL configuration polarization illumination device 1110.In this polarization illumination device 1110,, incide the 1st integration lens 1120 from the emission light of lamp 1112 light beam by catoptron 1114 reflections becoming almost parallel.Thus, the emission light from lamp 1112 is divided into a plurality of intermediate beam.This intermediate beam of cutting apart is transformed into the roughly light beam (s light beam) of a consistent kind of polarization direction by the polarization conversion device 1130 that the 2nd integration lens is arranged at light incident side, from 1110 emissions of polarization illumination device.
From s light beam reflecting surface 1141 reflections of the s light beam of polarization illumination device 1110 emission by polarization spectroscope 1140.In this folded light beam, the light beam of blue light (B) is by the blue light reflective layer reflects of dichronic mirror 1151, and the electro-optical device 100B by reflection-type modulates.In the light beam in the blue light reflection horizon that has seen through dichronic mirror 1151, the light beam of red light (R) is by the reflection of the red reflective layer of dichronic mirror 1152, and the electro-optical device 100R by reflection-type modulates.
On the other hand, in the light beam in the blue light reflection horizon that has seen through dichronic mirror 1151, the light beam of green light (G) sees through the red reflex layer of dichronic mirror 1152, and the electro-optical device 100G by reflection-type modulates.
Like this, by electro-optical device 100R, 100G, 100B carry out respectively the redness, green of coloured light modulation, blue light by dichronic mirror 1152,1151, polarization spectroscope 1140 synthetic successively after, project on the screen 1170 by projection optics system 1160.In electro-optical device 100R, 100B and 100G, come the incident light beam corresponding by dichronic mirror 1151,1152, so do not need color filter with each primary colours of R, G, B.
In the present embodiment, use the electro-optical device of reflection-type, but also can be used to use the projector of the electro-optical device that infiltration type shows.
＜portable computer 〉
The following describes the example that above-mentioned electro-optical device is applied to portable personal computer.Figure 21 is the oblique view of this personal computer architecture of expression.In the figure, computing machine 1200 by the body 1204 of being furnished with keyboard 1202, and display unit 1206 constitute.This display unit 1206 constitutes by light before the front of above-mentioned electro-optical device 100 is additional.
In this structure, because electro-optical device 100 is used as the reflection direct viewing type, so in pixel electrode 118, expectation forms concavo-convex structure, so that reflection light diffusing is arrived all directions.
The following describes the example that above-mentioned electro-optical device is applied to portable phone.Figure 22 is the oblique view of this portable phone structure of expression.In the figure, portable phone 1300 also comprises receiving mouth 1304, mouth piece 1306 and electro-optical device 100 except a plurality of work buttons 1302.
On this electro-optical device 100, also in its front preceding light is set as required.In this structure, owing to also electro-optical device 100 is used as the reflection direct viewing type, so be desirably in the concavo-convex structure of formation on the pixel electrode 118.
As electronic equipment, except reference Figure 21, Figure 22 describe, also can list LCD TV, the type of finding a view, monitor direct viewing type video tape recorder, automobile navigation apparatus, pager, electronic memo, counter, word processor, workstation, videophone, POS terminal, be furnished with the equipment of touch-screen etc.And, self-evident for these various electronic, can use the electro-optical device of the various embodiments described above or application examples.
Figure 23 to Figure 25 is expression the present invention the 3rd embodiment, and Figure 23 is the block scheme of the driving circuit that adopts among expression the 3rd embodiment, and Figure 24 and Figure 25 are the figure of explanation the 3rd embodiment.
The electro-optical device that uses among the hardware configuration of present embodiment and the 1st and the 2nd embodiment is roughly the same, and is different with the coding method of data conversion circuit 300 among Fig. 1 or the digital coding circuit 301 among Figure 11.
In above-mentioned the 1st embodiment, the son that applies forward voltage is concentrated on the response visibility that first half assigns to improve liquid crystal, and in the 2nd embodiment by with its part as cut-off voltage, can not increase the number of son and increase displayable tone number.But, as still frame, under the no problem situation of the response visibility of liquid crystal, apply the Zi Chang position of forward voltage and apply the Zi Chang position of cut-off voltage by suitable setting, compare with the 2nd embodiment, can further increase expressible tone number.
But, in Plasma Display etc., also adopt son to drive.In Plasma Display etc., the length (time width) of the sub-field period in changing 1, weighting that carries out having added weighting in each son drives.This is because in Plasma Display etc., the write time (sweep time) that needs pixel at each sub-field period, if the sub-number of fields order in 1 is increased, to be increased in the number of times that carries out pixel is write scanning in 1 field interval so, because this writes fluorescent lifetime is shortened, so picture can deepening.
To this, even increase sub-number of fields order in 1, liquid-crystal apparatus can not make the picture deepening yet.As mentioned above, the sub-number of fields order in 1 is many more, and expressible tone number is just many more.Therefore, consider hue table now in liquid-crystal apparatus, the sub-number of fields order in expecting 1 is many.But because the restriction of the device of high speed, the sub-number of fields order in 1 also is restricted.
Therefore, in the present embodiment, utilizing the saturation response time (from applying the liquid crystal forward voltage to the time that obtains 100% transmitance) of liquid crystal, for example is about 5 milliseconds in the projector purposes, increases expressible tone number and does not increase sub-number of fields order in 1.
The driving circuit of Figure 23 for example is equivalent to remove scan line drive circuit 401, data line drive circuit 500 and the viewing area 101a of Figure 11.Input is from horizontal-drive signal Hs, vertical synchronizing signal Vs and the Dot Clock DCLK of outside in a son timing generator 10.A son timing generator 10 generates a son timing signal that uses according to horizontal-drive signal Hs, vertical synchronizing signal Vs and the Dot Clock DCLK of input.
That is, a son timing generator 10 generates the signal that display driver uses, and promptly data transmit CLX, data useful signal ENBX, polarity inversion signal FR all the time, and output to data line drive circuit 500 (with reference to Figure 11).A son timing generator 10 generates sweep-initiating pulse DY, scan-side transmission clock CLY, and outputs to scan line drive circuit 401.A son timing generator 10 is created on the inner data of using of controller and transmits starting impulse DDS and sub-field identification signal SF, outputs to data encoder 30.
On the other hand, video data is fed into storer-controller 20.Write address generator 11 according to horizontal-drive signal Hs, vertical synchronizing signal Vs, Dot Clock DCLK from the outside input, specify the position of data on picture of sending this moment, result according to appointment, generation is used for video data is stored in the storage address of storer 23,24, outputs to storer-controller 20.
Read address generator 12 from the son timing signal that a son timing generator 10 generates, the decision position of this moment in display frame, result according to decision, according to write fashionable identical rule, generation is used for outputing to storer-controller 20 from the storage address of storer 23,24 reading of data.
Storer-controller 20 carry out will input video data be written in the storer 23,24 the or control of the data of reading displayed on display from storer 23,24.That is, storer-controller 20 make storer 23,24 is write from the data and the timing signal DCLK of outside input synchronous, with writing address generator 11 calculated addresses.From the address of reading address generator 12 generations, the timing signal CLX that reads with 10 generations of a son timing generator is carried out synchronously.Storer-controller 20 outputs to data encoder 30 with the data of reading.
Storer 23,24 is alternately switched as reading or writing in every.This switching controls is carried out according to timing signal by storer-controller 20.
Code storage with ROM31 storage should display brightness with respect to each pixel data (tone data), to be used for making pixel at each sub-field period be the H level of conducting state or cut-off state or the binary signal Ds of L level.When data (tone data) that code storage will should write in each pixel with ROM31 and the son that writes are imported as the address, the data (binary signal (data) Ds) of exportable 1 bit corresponding with this child field.
Data encoder 30 is according to data of sending here from storer-controller 20 and the sub-field identification signal SF that sends here from a son timing generator 10, generate the address of reading data necessary from code storage with ROM31, use this address from code storage with sense data the ROM31, with data transmission clock CLX synchronously and output to data line drive circuit 500.
In the present embodiment, code storage becomes the signal of having considered the liquid crystal response characteristic with the binary signal Ds that stores among the ROM31, according to tone data, becomes the value that white demonstration or black display are carried out in the anyon field that makes in all son fields.Figure 24 is the figure of description code storage with the binary signal Ds that stores among the ROM31.
Figure 24 represents the example that is divided into 6 son Sf1～Sf6 with 1 on time shaft.That is, be that 1 field interval is carried out 6 five equilibriums at Figure 24, the sub-field period during each is cut apart carries out a son exemplary plot that drives to pixel.The oblique line of Figure 24 partly represents to apply the sub-field period of forward voltage, and blank parts represents to apply the sub-field period of cut-off voltage.
In the present embodiment, to each pixel also according to the tone data of appointment in each sub-field period Sf1～Sf6, become conducting state (white shows) or cut-off state (black display) by making each pixel.Carrying out tone shows.
As shown in Figure 8, for applying instantaneous the reaching capacity of voltage (driving voltage) on the pixel electrode, the low-response of the transmitance of pixel, as Fig. 8 and shown in Figure 13, the transmitance of liquid crystal reaches capacity after the time delay of regulation.Figure 24 is illustrated in to have applied on the liquid crystal and uses liquid crystal to reach the liquid crystal material example of the time of optical saturated about needs 3～4 sub-field periods under the forward voltage situation.Applying under the cut-off voltage situation, transferring to non-non-response time, the liquid crystal material that use is longer than 1 sub-field period of seeing through that sees through state from state of saturation for transmitance.
Promptly, in the example of Figure 24, initial sub-field period after being illustrated in forward voltage and applying, liquid crystal is changed into 4/10 transmitance of saturated transmitance, before next sub-field period, promptly change 7/10 transmitance in two sub-field periods after forward voltage applies, change 8/10 transmitance in three sub-field periods after forward voltage applies, the example of the transmitance of change 10/10 in four son fields after forward voltage applies.
Initial sub-field period after the example of Figure 24 is illustrated in cut-off voltage and applies, the transmitance of liquid crystal reduces by 3/10, transmitance descends 5/10 in two son fields after cut-off voltage applies, transmitance descends 7/10 in three sub-field periods after cut-off voltage applies, the example of transmitance decline 10/10 in four sub-field periods after cut-off voltage applies.
3 sub-field periods that Figure 24 (a) is illustrated in the first half of field interval apply forward voltage, apply the example of cut-off voltage at 3 sub-field periods of latter half.The transmitance of liquid crystal rises to 4/10 of saturated transmitance in the 1st sub-field period, rise to 7/10 of saturated transmitance in the 2nd sub-field period, rises to 8/10 of saturated transmitance in the 3rd sub-field period.And then, in the 4th sub-field period, drop to 5/10 of saturated transmitance, in the 5th sub-field period, drop to 3/10 of saturated transmitance, in the 6th sub-field period, drop to 1/10 of saturated transmitance.
As mentioned above, under a son situation that the cycle (being 1 field interval in the example at Figure 24) that drives is very short, being directly proportional with the integrated value of transmitance changes brightness.In all sub-field periods, under situation about showing with 100% transmitance, suppose to obtain completely white and show, so the brightness of the field interval of Figure 24 (a) become that complete white shows (4+7+8+5+3+1)/brightness of 10} * 1/6=28/60.
Equally, in Figure 24 (a) be (4+3+1)/brightness of 10} * 1/6=8/60; In the example of Figure 24 (b), become completely that white shows (4+3+1+4+3+1)/brightness of 10} * 1/6=16/60.And in the example of Figure 24 (d), become completely that white shows (4+7+4+3+2+1)/brightness of 10} * 1/6=21/60.
As the 1st embodiment,,, can only obtain the demonstration of 6+1=7 tone by 6 sub-field periods of cutting apart making simply under the continuous situation of the sub-field period that applies forward voltage.To this, in the present embodiment, apply by suitable setting forward voltage sub-field period the position and apply the position of the sub-field period of cut-off voltage, can carry out the demonstration of the masstone number that significantly increases than 7 tones.
Figure 25 is illustrated among the 3rd embodiment 1 example that is divided into 16 son fields on time shaft.The oblique line of Figure 25 partly represents to apply the sub-field period of forward voltage, and blank parts represents to apply the sub-field period of cut-off voltage.In all sub-field periods, obtain completely that white shows carrying out under the white demonstration situation hypothesis, so Figure 25 (a) to the brightness of each field interval of Figure 25 (c) be respectively that complete white shows about 60%, 50% or 55%.
The example of Figure 25 represent to apply Figure 25 (a) to the sub-number of fields order of any one forward voltage of Figure 25 (c) be similar number, but arrangement according to conducting, disabling pulse, promptly, change the situation of brightness according to the position and the Zi Chang position that applies cut-off voltage of the son field that applies forward voltage.
Make simply under the continuous situation of the sub-field period that applies forward voltage, can only obtain the demonstrations of 17 tones by 16 son fields, but in the example of Figure 25, can carry out the above tone of 160 tones and show.Equally, under the situation that 1 is being divided into 32 son fields on the time shaft, can carry out the above tone of 256 tones and show.
1 the number of cutting apart can be several arbitrarily, and is identical with other embodiment.Present embodiment also can be applied to utilize the slow electrophoretic display apparatus of response speed etc.
As described above, according to the present invention, can improve response characteristic as the liquid crystal of electrooptical material, improve image quality, even and, also have the much more tone display effect of number that to carry out than the son field not being weighted, cutting apart under the situation that decides the son field by simple field.

Claims (19)

1. the driving method of an electro-optical device, it is characterized in that, described driving method is used for each is divided into a plurality of sons field on time shaft, according to tone data, each the son in by driving with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, make corresponding and a plurality of pixels that be provided with are carried out the tone demonstration with intersecting of a plurality of data lines and a plurality of sweep traces
So that becoming the first half that pulse signal through state concentrates on described, each pixel of described a plurality of pixels assigns to control.
2. the driving method of electro-optical device as claimed in claim 1, it is characterized in that, under the situation of show events image, in the switching on the scene, under the situation that displaying contents changes, the direction that changes according to picture brightness changes the described described pulse width of switching in the field that sees through the pulse signal of state that becomes.
3. the driving method of electro-optical device as claimed in claim 1 is characterized in that, output becomes the non-pulse signal that sees through state in described last at least son field.
4. the driving method of electro-optical device as claimed in claim 1, it is characterized in that, above-mentioned pixel has electro-optical substance, pass through temperature-detecting device, detect the temperature around described electro-optical substance itself or this electro-optical substance, and export to change according to the detection of said temperature pick-up unit and become the described pulse width that sees through the pulse signal of state in each.
5. the driving circuit of an electro-optical device comprises:
Intersects a plurality of pixels of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, corresponding with described on-off element and the pixel electrode of setting with the opposite electrode of described pixel electrode arranged opposite, is characterized in that at the on-off element of described each pixel setting,
Each is divided into a plurality of sons field on time shaft, according to tone data, each the son in by driving described pixel with forward voltage or cut-off voltage, by with a son type of drive each pixel of described a plurality of pixels being become through state or the non-state that sees through inside, carrying out tone shows
Comprise control assembly, assign to control so that each pixel of described a plurality of pixels becomes the first half that pulse signal through state concentrates on described.
6. the driving circuit of electro-optical device as claimed in claim 5, it is characterized in that, described control assembly is in the switching of show events image situation end, under the situation that displaying contents changes, the direction that changes according to picture brightness changes the described described pulse width that sees through the pulse signal of state of becoming of field of switching.
7. the driving circuit of electro-optical device as claimed in claim 5 is characterized in that, the output in described last at least son field of described control assembly becomes the non-pulse signal that sees through state.
8. the driving circuit of electro-optical device as claimed in claim 5 is characterized in that, above-mentioned pixel comprises:
Temperature detection part, described pixel has electro-optical substance, and described temperature detection part detects the temperature around described electro-optical substance self or this electro-optical substance; And
The impulse correction parts are exported to change in each according to what tone was predetermined according to the detection of described temperature detection part and are become the described pulse width that sees through the pulse signal of state.
9. an electro-optical device is characterized in that, comprising:
Intersects a plurality of pixels of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, at the on-off element of described each pixel setting, and the pixel electrode of setting corresponding with described on-off element, with the opposite electrode of described pixel electrode arranged opposite,
Scan line drive circuit is divided into a plurality of sons field with each on time shaft, will make the sweep signal of described on-off element conducting supply with described each sweep trace in each height field of this a plurality of sons field;
Data line drive circuit, according to tone data, each the son in according to the indication each pixel forward voltage or cut-off voltage, supply with on to each this pixel corresponding scanning beam described sweep signal during, each pixel will be become through state or the non-binary signal that sees through state supply with and this pixel corresponding data line; And
Control assembly is controlled the data line drive circuit, and feasible each pixel with described a plurality of pixels becomes the first half that concentrates on described field through the pulse signal of state.
10. electro-optical device as claimed in claim 9, it is characterized in that, described control assembly carries out under show events image situation in the switching of field, under the situation that displaying contents changes, the direction that changes according to picture brightness change described switching the field become the described pulse width that sees through the pulse signal of state.
11. electro-optical device as claimed in claim 9 is characterized in that, the output in described last at least son field of described control assembly becomes the non-pulse signal that sees through state.
12. electro-optical device as claimed in claim 9 is characterized in that, above-mentioned pixel comprises:
Temperature detection part, described pixel has electro-optical substance, and described temperature detection part detects the temperature around described electro-optical substance self or this electro-optical substance; And
The impulse correction parts are exported to change in each according to what tone was predetermined according to the detection of described temperature detection part and are become the described pulse width that sees through the pulse signal of state.
13. an electronic equipment is characterized in that, comprises any one described electro-optical device of claim 9 to 12.
14. the driving method of an electro-optical device, described driving method is used for each is divided into a plurality of sons field on time shaft, according to video data, by forward voltage or cut-off voltage control make pixel become through state the son, drive a plurality of pixels, thereby making each pixel of described a plurality of pixels carry out tone with a son type of drive inside shows, it is characterized in that
According to video data, in the son field that becomes the state of seeing through that first half on the scene disposes continuously, make a part of son field be in the state that does not become through state according to rule by the video data decision.
15. the driving method of electro-optical device as claimed in claim 14, it is characterized in that, according to video data, first half on the scene is continuously in the son of the state that sees through of configuration, makes near the state that sees through except seeing through son that state begins the son field beginning become non-through state according to the rule by described video data decision.
16. the driving method of electro-optical device as claimed in claim 14, it is characterized in that, according to video data, first half on the scene is continuously in the son of the state that sees through of configuration, makes near the state that sees through except seeing through son that state finishes the son field finishing become non-through state according to the rule by described video data decision.
17. the driving circuit of an electro-optical device, have with each of a plurality of sweep traces and a plurality of data lines and intersects a plurality of pixels of corresponding configuration, at the on-off element of described each pixel setting, and the pixel electrode of setting corresponding with described on-off element, opposite electrode with described pixel electrode arranged opposite
With controlling by forward voltage or cut-off voltage in each son above-mentioned pixel is become through the son of state, transfers in the enterprising circumstances in which people get things ready for a trip of each pixel of described a plurality of pixels with son type of drive inside thus to show, it is characterized in that,
Comprise control assembly, in the son field that becomes the state of seeing through of configuration continuously, control so that part field becomes the non-state that sees through.
18. an electro-optical device is characterized in that, comprising:
Intersects a plurality of pixels of corresponding configuration with each of a plurality of sweep traces and a plurality of data lines, at the on-off element of described each pixel setting, and the pixel electrode of setting corresponding with described on-off element, with the opposite electrode of described pixel electrode arranged opposite,
Scan line drive circuit is divided into a plurality of sons field with each on time shaft, will make the sweep signal of described on-off element conducting supply with described each sweep trace in each height field of this a plurality of sons field; And
Control assembly, make each pixel of described a plurality of pixels become the first half that concentrates on described field through the pulse signal of state, becoming of disposing continuously through in the pulse signal of state, come the control data line drive circuit according to video data, make a part of pulse signal become the non-state that sees through.
19. an electronic equipment is characterized in that, comprises the described electro-optical device of claim 18.
CNB2004100956929A 2001-07-03 2002-02-28 Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment Expired - Lifetime CN100363962C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP2001202131 2001-07-03
JP202131/01 2001-07-03
JP202131/2001 2001-07-03
JP233539/2001 2001-08-01
JP233539/01 2001-08-01
JP2001233539 2001-08-01
JP367074/2001 2001-11-30
JP367074/01 2001-11-30
JP2001367074A JP3918536B2 (en) 2000-11-30 2001-11-30 Electro-optical device driving method, driving circuit, electro-optical device, and electronic apparatus

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CNB021065675A Division CN1204540C (en) 2001-07-03 2002-02-28 Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment

Publications (2)

Publication Number Publication Date
CN1617196A true CN1617196A (en) 2005-05-18
CN100363962C CN100363962C (en) 2008-01-23

Family

ID=27347075

Family Applications (2)

Application Number Title Priority Date Filing Date
CNB021065675A Expired - Lifetime CN1204540C (en) 2001-07-03 2002-02-28 Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment
CNB2004100956929A Expired - Lifetime CN100363962C (en) 2001-07-03 2002-02-28 Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CNB021065675A Expired - Lifetime CN1204540C (en) 2001-07-03 2002-02-28 Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment

Country Status (2)

Country Link
KR (1) KR100501622B1 (en)
CN (2) CN1204540C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101582231A (en) * 2008-05-12 2009-11-18 精工爱普生株式会社 Electro-optic device, driving method, and electronic apparatus
CN101872083A (en) * 2009-04-24 2010-10-27 索尼爱立信移动通信Ab株式会社 Display device, display packing and program
CN102074213A (en) * 2009-11-19 2011-05-25 精工爱普生株式会社 Liquid crystal device, driving method thereof, and electronic apparatus
CN103050100A (en) * 2011-10-13 2013-04-17 精工爱普生株式会社 Electro-optic device and electronic apparatus
CN110767085A (en) * 2019-03-29 2020-02-07 昆山国显光电有限公司 Display substrate, display panel and display device

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006138895A (en) * 2004-11-10 2006-06-01 Seiko Epson Corp Image display device and driving method of liquid crystal panel
CN104597682B (en) * 2006-06-09 2018-04-13 金泰克斯公司 Variable transmission window system
JP5434091B2 (en) * 2009-01-26 2014-03-05 セイコーエプソン株式会社 Electro-optical device and electronic apparatus
JP5481740B2 (en) * 2009-09-27 2014-04-23 ソリューション デポ （シェンツェン）リミテッド Touch display that can eliminate the effects of touch on the display
JP2011150004A (en) * 2010-01-19 2011-08-04 Seiko Epson Corp Electro-optic device and electronic equipment
CN102005197B (en) * 2010-10-28 2013-02-27 友达光电股份有限公司 Drive circuit and related drive method of liquid crystal display
JP5948788B2 (en) * 2011-10-18 2016-07-06 ソニー株式会社 OPERATION CONTROL DEVICE, OPERATION CONTROL METHOD, IMAGING DEVICE, AND PROGRAM
EP2927739A4 (en) * 2012-12-03 2016-08-10 Colorlink Japan Ltd Optical device
JP6922889B2 (en) * 2016-03-04 2021-08-18 ソニーグループ株式会社 Solid-state image sensor, drive method, and electronic equipment

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3173745B2 (en) * 1992-07-24 2001-06-04 株式会社半導体エネルギー研究所 Liquid crystal display
JP3154878B2 (en) * 1993-08-05 2001-04-09 富士写真フイルム株式会社 Frame duty drive method
JPH09319342A (en) * 1996-03-26 1997-12-12 Sharp Corp Liquid crystal display device, and driving method for the device
JPH1063225A (en) * 1996-08-19 1998-03-06 Citizen Watch Co Ltd Display device
US6057809A (en) * 1996-08-21 2000-05-02 Neomagic Corp. Modulation of line-select times of individual rows of a flat-panel display for gray-scaling
JP3342341B2 (en) * 1997-03-13 2002-11-05 キヤノン株式会社 Liquid crystal device and driving method of liquid crystal device
JPH1138928A (en) * 1997-07-23 1999-02-12 Sharp Corp Display device
KR100424751B1 (en) * 1999-09-27 2004-03-31 세이코 엡슨 가부시키가이샤 Method of driving electrooptic device, driving circuit, electrooptic device, and electronic apparatus
JP3824459B2 (en) * 1999-11-08 2006-09-20 富士通株式会社 Liquid crystal display

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101582231A (en) * 2008-05-12 2009-11-18 精工爱普生株式会社 Electro-optic device, driving method, and electronic apparatus
CN101582231B (en) * 2008-05-12 2013-07-10 精工爱普生株式会社 Electro-optic device, driving method, and electronic apparatus
CN101872083A (en) * 2009-04-24 2010-10-27 索尼爱立信移动通信Ab株式会社 Display device, display packing and program
CN102074213A (en) * 2009-11-19 2011-05-25 精工爱普生株式会社 Liquid crystal device, driving method thereof, and electronic apparatus
CN102074213B (en) * 2009-11-19 2014-10-08 精工爱普生株式会社 Liquid crystal device, driving method thereof, and electronic apparatus
CN103050100A (en) * 2011-10-13 2013-04-17 精工爱普生株式会社 Electro-optic device and electronic apparatus
CN110767085A (en) * 2019-03-29 2020-02-07 昆山国显光电有限公司 Display substrate, display panel and display device

Also Published As

Publication number Publication date
KR20030003662A (en) 2003-01-10
CN100363962C (en) 2008-01-23
KR100501622B1 (en) 2005-07-18
CN1393845A (en) 2003-01-29
CN1204540C (en) 2005-06-01

Similar Documents

Publication Publication Date Title
CN1193337C (en) Liquid crystal display device, driving circuit, driving method and electronic device
CN1265341C (en) Photoelectric device, drive method and circuits thereof, and electronic machine
CN1251162C (en) Matrix display
CN1175461C (en) Plane display panel, method for manufacturing the same, controller for controlling the same, and method for driving the same
CN1197050C (en) Signal drive circuit, display, electrooptical apparatus and signal driving method
CN1272764C (en) Image display device
CN1385830A (en) LCD device
CN1255777C (en) Method of driving image display deivce, driving device for image display device, and image display device
CN1204540C (en) Method for driving electrooptics apparatus, driving circuit, electrooptics apparatus and electronic equipment
CN1377495A (en) Method for driving display panel, and display panel luminance correction device and display panel driving device
CN1383121A (en) Displaying device and driving method thereof
CN1801304A (en) Image display device and method of displaying image
CN1783197A (en) Liquid-crystal display device and method of driving liquid-crystal display device
CN1648982A (en) Liquid crystal display device, and method and circuit for driving liquid crystal display device
CN1457449A (en) Liquid crystal display unit and driving method therefor
CN1881393A (en) Plasma display apparatus and driving method thereof
CN1809858A (en) Signal line driving circuit and light emitting device
CN1784708A (en) Current output type of semiconductor circuit,source driver for display drive,display device,and current output method
CN1637544A (en) Liquid crystal display and driving method thereof
CN1783194A (en) Driving method of display
CN1801268A (en) Image display device and image display method thereof
CN1470930A (en) Dispalying device and its driving method
CN1482583A (en) Reflection display element, its manufacture and reflection display device
CN1322340A (en) Method of driving electrooptic device, driving circuit, electrooptic device, and electronic apparatus
CN1797526A (en) Driving method of display device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20160530

Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No.

Patentee after: BOE TECHNOLOGY GROUP Co.,Ltd.

Address before: Hongkong, China

Patentee before: BOE Technology (Hongkong) Co.,Ltd.

Effective date of registration: 20160530

Address after: Hongkong, China

Patentee after: BOE Technology (Hongkong) Co.,Ltd.

Address before: Tokyo, Japan

Patentee before: Seiko Epson Corp.

CX01 Expiry of patent term

Granted publication date: 20080123

CX01 Expiry of patent term