CN101350184B - Color sequence LCD and pixel circuit thereof - Google Patents

Abstract

The invention provides a color sequence liquid crystal display device and a pixel circuit thereof. The pixel circuit comprises a first sampling switch, a second sampling switch, a first voltage register, a second voltage register, a first output switch, a second output switch, a liquid crystal capacitance and a replacement switch, wherein the first voltage register is coupled with the first sampling switch and the first output switch, first sampling voltage is temporarily stored during a first subframe period, and the first sampling voltage is output to the liquid crystal capacitance during asecond subframe period. The second voltage register is coupled with the second sampling switch and the second output switch, second sampling voltage is temporarily stored during the second subframe period, and the second sampling voltage is output to the liquid crystal capacitance during the first subframe period. The replacement switch is coupled with the liquid crystal capacitance, and replacement voltage is transmitted to the liquid crystal capacitance between a first subframe and a second subframe. The color sequence liquid crystal display device and the pixel circuit thereof can increasethe operation efficiency of the pixel circuit, and prolongs the time of lighting monochromatic light source of a pixel.

Description

Color sequence LCD and its image element circuit

Technical field

The invention relates to a kind of plane display technique, and particularly relevant for a kind of color sequence LCD and its image element circuit.

Background technology

Along with photoelectricity and development of semiconductor, driven the flourish of flat-panel screens, and in many flat-panel screens, LCD is because of having advantageous characteristic such as high spatial utilization ratio, low consumpting power, radiationless and low electromagnetic interference (EMI), and become the main flow in market.Generally speaking, traditional display panels can utilize trichromatic sub-pixel (that is red, green, blue three sub-pixels) mode of colour mixture on spatial axes, comes the color and the briliancy of image data displaying institute desire performance.

Also, the colored filter of red, green, blue three looks traditional just must be set on each location of pixels of display panels also because of so, and employing white backlight light source and via three color colo(u)r filters on each location of pixels, to reach three primary colors colour mixture explicit representation.Yet, because each color sub-pixel can only be by the luminous energy of this color, to such an extent as to the light of color penetrates only surplus 1/3 space.In addition, because colorized optical filtering sector-meeting absorbing light energy significantly, to such an extent as to the luminous energy service efficiency can be on the low side.In order to overcome the shortcoming of three primary colors colour mixture explicit representation, look preface method (Color Sequential Method) becomes a kind of display packing that can reduce luminous energy consumption.

Look preface method is the practice of colored filter colour mixture on spatial axes originally, that is sub-pixel colour mixture in of red, green, blue three looks on the spatial axes less than the scope at human eye visual angle, make the colour mixture of backlight on time shaft into via light emitting diode, that is in the time range that human eye vision persists, with image quick switching on time shaft of red, green, blue three looks to produce the effect of colour mixture.Fig. 1 illustrates the time sequential routine figure into traditional color sequence LCD.Please refer to Fig. 1,1/3 time that each subframe (Sub-frame) is about conventional frame (is about 5.56ms, 180Hz).Comprised data write time (AddressingTime), liquid crystal reaction time (LC Response Time) and monochromatic source in each subframe and lighted the time (IlluminationTime), and these three periods can carry out in a subframe in regular turn, use the subframe (that is red, green or blue subframe) that shows a correspondence.

With the red sub-frame is example, at first the red data signal is write to each pixel in the display panels.Then, the liquid crystal molecule of waiting for each pixel is opened light-emitting diode (LED) backlight module (LED backlight module) so that red back light to be provided after reaction a period of time again.Thus, promptly can show a red sub-frame.After the red sub-frame demonstration finished, green sub-frame and blue subframe can continue and finish demonstration, used the image that reaches red, green, blue three looks and switched and the effect of generation colour mixture fast on time shaft.

Yet, (that is must one be listed as and import the red data signal because the mode that writes data of look preface method is the reactive mode of row sequence (Row-by-Row), after entire frame all writes data, just open red back light to show), so be easy to cause the uneven phenomenon of liquid crystal reaction.In addition, the operating speed of look preface method again must than traditional spacing color mixed operation of LCD speed come height more.Generally speaking, the operating speed of look preface method must reach more than the 180Hz and just can have better display quality.

Also also because of like this, if the operating speed of look preface method is low excessively, the phenomenon of color-separated (Color Breakup) takes place possibly, and the demand of the high operating speed of holding, add in the look preface method traditional design each subframe and need vacate the independently restriction of data write time, to such an extent as to can cause liquid crystal reaction time and the monochromatic source time of lighting to be compressed significantly.

Summary of the invention

In view of this, purpose of the present invention is providing a kind of color sequence LCD and its image element circuit, it carries out the action of outputting data signals and readout data signal synchronously and alternately by one first voltage working storage and one second voltage working storage, use the data-signal that carries out subframe simultaneously and write the operation that shows with data-signal, light the time with the monochromatic source that increases in the color sequence LCD.

The present invention proposes a kind of image element circuit of color sequence LCD, and this image element circuit comprises: first sampling switch is used to transmit first sampling voltage during first subframe; Second sampling switch is used to transmit second sampling voltage during second subframe; The first voltage working storage couples described first sampling switch, is used to keep in described first sampling voltage during described first subframe, and exports described first sampling voltage during described second subframe; The second voltage working storage is used to keep in described second sampling voltage during described second subframe, and exports described second sampling voltage during described first subframe; The first output switch couples the described first voltage working storage, is used to transmit described first sampling voltage during described second subframe; The second output switch couples the described second voltage working storage, is used to transmit described second sampling voltage during described first subframe; One liquid crystal capacitance couples described first output switch and the described second output switch and uses voltage altogether, is used to receive described second sampling voltage during described first subframe, receives described first sampling voltage during described second subframe; And reset switch, couple described liquid crystal capacitance, be used to the described first output switch before described first sampling voltage of output during described second subframe, transmit a reset voltage with the described liquid crystal capacitance of resetting, before described second sampling voltage of output during described first subframe, transmit a reset voltage in the described second output switch with the described liquid crystal capacitance of resetting.

The present invention also proposes a kind of color sequence LCD, and this LCD comprises: a display panels comprises at least: an image element circuit.This image element circuit comprises: first sampling switch is used to transmit first sampling voltage during first subframe; Second sampling switch is used to transmit second sampling voltage during second subframe; The first voltage working storage couples described first sampling switch, is used to keep in described first sampling voltage during described first subframe, and exports described first sampling voltage during described second subframe; The second voltage working storage is used to keep in described second sampling voltage during described second subframe, and exports described second sampling voltage during described first subframe; The first output switch couples the described first voltage working storage, is used to transmit described first sampling voltage during described second subframe; The second output switch couples the described second voltage working storage, is used to transmit described second sampling voltage during described first subframe; One liquid crystal capacitance couples described first output switch and the described second output switch and uses voltage altogether, is used to receive described second sampling voltage during described first subframe, receives described first sampling voltage during described second subframe; And reset switch, couple described liquid crystal capacitance, be used to the described first output switch before described first sampling voltage of output during described second subframe, transmit a reset voltage with the described liquid crystal capacitance of resetting, before described second sampling voltage of output during described first subframe, transmit a reset voltage in the described second output switch with the described liquid crystal capacitance of resetting.

In an embodiment of the present invention, the image element circuit of described color sequence LCD, wherein the first voltage working storage and the second voltage working storage are the capacitor voltage working storage.

In an embodiment of the present invention, the image element circuit of described color sequence LCD, wherein the first voltage working storage and the second voltage working storage are made of at least one electric capacity respectively.

In an embodiment of the present invention, the image element circuit of described color sequence LCD, wherein the first voltage working storage is made of an electric capacity and an analogue buffer, and the second voltage working storage is made of an electric capacity and an analogue buffer.

In an embodiment of the present invention, the image element circuit of described color sequence LCD wherein during first subframe, sees through the second voltage working storage and shares the GTG that decides image element circuit with the electric charge of liquid crystal capacitance.

In an embodiment of the present invention, the image element circuit of described color sequence LCD wherein during second subframe, sees through the first voltage working storage and shares the GTG that decides image element circuit with the electric charge of liquid crystal capacitance.

In an embodiment of the present invention, described color sequence LCD, wherein display panels comprises at least: first sweep trace couples described first sampling switch, be used to receive first sweep signal during described first subframe, so that described first sampling switch of energy; Second sweep trace couples described second sampling switch, is used to receive second sweep signal during described second subframe, so that described second sampling switch of energy; And data line, couple described first sampling switch and described second sampling switch, being used to provides described first sampling voltage during described first subframe, and described second sampling voltage is provided during described second subframe.

In an embodiment of the present invention, described color sequence LCD, this LCD more comprises: time schedule controller; Gate drivers couples and is controlled by time schedule controller, is used to produce described first sweep signal to described first sweep trace during described first subframe, produces described second sweep signal to described second sweep trace during described second subframe; And source electrode driver, couple and be controlled by described time schedule controller, be used to produce described first sampling voltage to described data line during described first subframe, during described second subframe, produce described second sampling voltage to described data line.

In an embodiment of the present invention, described color sequence LCD more comprises light-emitting diode (LED) backlight module, in order to provide described display panels required area source.

In an embodiment of the present invention, described color sequence LCD, more comprise control module, couple described first output switch and described second output switch and the described reset switch, be used to the described first output switch before described first sampling voltage of output during described second subframe, provide one first control signal so that the described reset switch of energy, before described second sampling voltage of output during described first subframe, provide one first control signal in the described second output switch so that can described reset switch.

In an embodiment of the present invention, described color sequence LCD, more comprise the reset voltage generator, couple described reset switch, be used to the described first output switch before described first sampling voltage of output during described second subframe, provide described reset voltage to described reset switch, before described second sampling voltage of output during described first subframe, provide described reset voltage to described reset switch in the described second output switch.

In an embodiment of the present invention, described color sequence LCD, wherein said control module is more behind the described liquid crystal capacitance of resetting during described first subframe, provide one second control signal so that the described second output switch of energy, behind the described liquid crystal capacitance of resetting during described second subframe, provide one the 3rd control signal so that can the described first output switch.

In an embodiment of the present invention, described color sequence LCD, wherein the first voltage working storage and the second voltage working storage are the capacitor voltage working storage.In another embodiment, the described first voltage working storage and the second voltage working storage are made of at least one electric capacity respectively.Among another embodiment, the described first voltage working storage is made of an electric capacity and an analogue buffer again, and the described second voltage working storage is made of an electric capacity and an analogue buffer.

In an embodiment of the present invention, described color sequence LCD wherein during first subframe, sees through the second voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of described liquid crystal capacitance.

In an embodiment of the present invention, described color sequence LCD wherein during second subframe, sees through the first voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of liquid crystal capacitance.

The present invention comprises the structure of two voltage working storages of the first voltage working storage and the second voltage working storage because of adopting an image element circuit, therefore one of them voltage working storage is when reading of data, another voltage working storage can be shown in the data-signal that had before stored on the pixel simultaneously, with the data-signal that carries out subframe simultaneously write the operation of lighting with monochromatic source, increasing the image element circuit efficiency of operating, and prolong the time that the monochromatic source of pixel is lighted.

For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.

Description of drawings

Fig. 1 illustrates the time sequential routine figure into traditional color sequence LCD.

Fig. 2 illustrates the system block diagrams into the color sequence LCD of one embodiment of the invention.

Fig. 3 illustrates the circuit diagram into the part of display panels among Fig. 2 (2*2) image element circuit.

Fig. 4 A and Fig. 4 B illustrate the enforcement aspect synoptic diagram into the voltage working storage of one embodiment of the invention respectively.

Fig. 5 A, Fig. 5 B and Fig. 5 C illustrate to the electric charge of the image element circuit of one embodiment of the invention and share the process synoptic diagram.

Fig. 6 is the time sequential routine figure according to a kind of color sequence LCD of one embodiment of the invention.

Drawing reference numeral:

200: color sequence LCD

210: display panels

220: time schedule controller

230: gate drivers

240: source electrode driver

250: light-emitting diode (LED) backlight module

260: control module

270: reset voltage generation circuit

P ₁, P ₂, P ₃, P ₄: image element circuit

SA ₁₁, SA ₂₁, SA ₃₁, SA ₄₁: first sampling switch

SA ₁₂, SA ₂₂, SA ₃₂, SA ₄₂: second sampling switch

SB ₁₁, SB ₂₁, SB ₃₁, SB ₄₁: the first output switch

SB ₁₂, SB ₂₂, SB ₃₂, SB ₄₂: the second output switch

SR ₁, SR ₂, SR ₃, SR ₄: reset switch

CS ₁₁, CS ₂₁, CS ₃₁, CS ₄₁: the first voltage working storage

CS ₁₂, CS ₂₂, CS ₃₂, CS ₄₂: the second voltage working storage

C _LC1, C _LC2, C _LC3, C _LC4: liquid crystal capacitance

S ₁, S ₂: data line

G ₁, G ₂, G ₃, G ₄, G _Odd, G _Even: sweep trace

RST: first control signal

OB, OB ₁, OB ₂, OB _i: second control signal

OA, OA ₁, OA ₂, OA _i: the 3rd control signal

V _P, V _R: voltage

V _COM: common voltage

V _RST: reset voltage

V _CST1, V _CST2: the storage capacitors reference voltage

C _ST1, C _ST2, C _ST1A, C _ST1B: storage capacitors

AB: analogue buffer

Embodiment

Fig. 2 illustrates the system block diagrams into the color sequence LCD 200 of one embodiment of the invention.Please refer to Fig. 2, color sequence LCD 200 comprises display panels 210, time schedule controller 220, gate drivers 230, source electrode driver 240, light-emitting diode (LED) backlight module 250, control module 260, and reset voltage generation circuit 270.Wherein, time schedule controller 220 couples and control gate driver 230 and source electrode driver 240.Gate drivers 230 couples display panels 210, provides sweep signal (scan signal) to display panels 210 in order to sequence.Source electrode driver 240 couples display panels 210, in order to provide data-signal (data signal) to display panels 210.

Light-emitting diode (LED) backlight module 250 is disposed at the below (but also configurable in the side of display panels 210) of display panels 210, in order to when display panels shows the red, green, blue subframe, the monochromatic source that the red, green, blue color is provided respectively is to display panels 210, to reach the color sequence display effect.Control module 260 couples display panels 210, in order to provide the first control signal RST, the second control signal OB and the 3rd control signal OA to display panels 210.Reset voltage generator 270 couples display panels 210, in order to provide reset voltage VRST to display panels 210.

Fig. 3 illustrates and is the part of display panels 210 (2*2) image element circuit P ₁～P ₄Circuit diagram.Please merge with reference to figure 2 and Fig. 3, display panels 210 comprises liquid crystal capacitance C _LC1～C _LC4, the first sampling switch SA ₁₁, SA ₂₁, SA ₃₁And SA ₄₁, the second sampling switch SA ₁₂, SA ₂₂, SA ₃₂And SA ₄₂, the first output switch S B ₁₁, SB ₂₁, SB ₃₁And SB ₄₁, the second output switch S B ₁₂, SB ₂₂, SB ₃₂And SB ₄₂, reset switch SR ₁～SR ₄, sweep trace G ₁～G ₄, the first voltage working storage CS ₁₁, CS ₂₁, CS ₃₁And CS ₄₁, the second voltage working storage CS ₁₂, CS ₂₂, CS ₃₂And CS ₄₂, and data line S ₁And S ₂

Sweep trace G ₁～G ₄The sweep signal that meeting sequential reception is exported from gate drivers 230.Data line S ₁And S ₂The data-signal that meeting reception sources driver 240 is exported, using provides to corresponding image element circuit P ₁～P ₄The first control signal RST among Fig. 3, the second control signal OB ₁And OB ₂And the 3rd control signal OA ₁And OA ₂Be to export, in order to control each image element circuit P respectively from control module 260 ₁～P ₄In reset switch SR ₁～SR ₄, the second output switch S B ₁₂, SB ₂₂, SB ₃₂, SB ₄₂And the first output switch S B ₁₁, SB ₂₁, SB ₃₁, SB ₄₁Start.

Reset voltage V _RSTBe to export, in order to each image element circuit P that resets from reset voltage generator 270 ₁～P ₄In liquid crystal capacitance C _LC1, C _LC2, C _LC3And C _LC4Below will be earlier at image element circuit P ₁Circuit structure and operation principles explain, pixel P is described afterwards again ₁～P ₄Overall operation.

Image element circuit P ₁Comprise liquid crystal capacitance C _LC1, the first sampling switch SA ₁₁, the second sampling switch SA ₁₂, the first output switch S B ₁₁, the second output switch S B ₁₂, reset switch SR ₁, the first voltage working storage CS ₁₁, and the second voltage working storage CS ₁₂Wherein, first and second sampling switch SA ₁₁, SA ₁₂Be coupled to first and second voltage working storage CS respectively ₁₁, CS ₁₂, to store first and second sampling voltage.As the first sampling switch SA ₁₁During unlatching, second sampling switch _SA12Close, so data line S ₁The data-signal of correspondence can be provided to the first voltage working storage CS ₁₁In, and this moment the first voltage working storage CS ₁₁In stored data-signal be first sampling voltage.

Similarly, as the second sampling switch SA ₁₂During unlatching, the first sampling switch SA ₁₁Close, so data line S ₁The data-signal of correspondence can be provided to the second voltage working storage CS ₁₂In, and this moment the second voltage working storage CS ₁₂In stored data-signal be second sampling voltage.First and second output switch S B ₁₁, SB ₁₂Be coupled to first and second voltage working storage CS respectively ₁₁, CS ₁₂, with first or second sampling voltage from first and second voltage working storage CS ₁₁, CS ₁₂Write to liquid crystal capacitance C _LC1Liquid crystal capacitance C _LC1Be coupled to first and second output switch, to receive first or second sampling voltage.Reset switch SR ₁Be coupled to liquid crystal capacitance C _LC1, use so that reset voltage V _RSTConduct to liquid crystal capacitance C _LC1, with liquid crystal capacitance C _LC1Reset.

Below be the image element circuit P of Fig. 3 ₁Operation principles.At first, in image element circuit P ₁First subframe (for example being red sub-frame) of N frame the time, with liquid crystal capacitance C _LC1Reset, to prepare to receive desire data presented signal.This moment, first and second exported switch S B ₁₁, SB ₁₂All close, and reset switch SR ₁Then open, make liquid crystal capacitance C _LC1Discharge and recharge to reset voltage V _RSTLiquid crystal capacitance C _LC1Discharge and recharge finish after, reset switch SR ₁Close again.Liquid crystal capacitance C _LC1After replacement finishes, the first sampling switch SA ₁₁Then open, make the first voltage working storage CS ₁₁Store first sampling voltage.The first sampling switch SA ₁₁When opening, the second output switch S B ₁₂Also open, will go up a subframe (is image element circuit P ₁The blue subframe of (N-1) individual frame) in, be stored in the second voltage working storage CS ₁₂Second sampling voltage export liquid crystal capacitance C to _LC1

And then, as image element circuit P ₁When entering second subframe (for example green sub-frame of N the frame of image element circuit P1), carry out liquid crystal capacitance C once more _LC1The action of resetting, first and second output switch S B ₁₁, SB ₁₂All close, and reset switch SR ₁Then open, make liquid crystal capacitance C _LC1Discharge and recharge to reset voltage V _RSTLiquid crystal capacitance C _LC1Discharge and recharge finish after, reset switch SR ₁Close once again.Then, the second sampling switch SA ₁₂Open, make the second voltage working storage CS ₁₂Store second sampling voltage.The second sampling switch SA ₁₂When opening, the first output switch S B ₁₁Also open, will go up a subframe (is image element circuit P ₁The red sub-frame of N frame) in, be stored in the first voltage working storage CS ₁₁First sampling voltage export liquid crystal capacitance C to _LC1

According to previous described image element circuit P ₁Operation principles, first and second voltage working storage CS ₁₁, CS ₁₂Can repeatedly, alternately and synchronously store first or second sampling voltage, and export first or second sampling voltage to liquid crystal capacitance C _LC1Action, so that can know by inference is image element circuit P ₁That adopt is analog sampling and maintenance (Sample﹠amp; Hold) circuit structure.

Clearer, the first voltage working storage CS ₁₁Can read first sampling voltage repeatedly and export first sampling voltage; The second voltage working storage CS ₁₂Then can read second sampling voltage repeatedly and export second sampling voltage; And as the first voltage working storage CS ₁₁When reading first sampling voltage, the second voltage working storage CS ₁₂Can export second sampling voltage; As the second voltage working storage CS ₁₂When reading second sampling voltage, the first voltage working storage CS ₁₁Can output first sampling voltage.

Fig. 4 A and Fig. 4 B illustrate the enforcement aspect synoptic diagram into the voltage working storage of one embodiment of the invention respectively.Please merge with reference to Fig. 4 A and Fig. 4 B, Fig. 4 A illustrates a kind of enforcement aspect into first and second voltage working storage, and it is by at least one capacitor C _ST1Constitute.Fig. 4 B illustrates to the another kind of first and second voltage working storage and implements aspect, and it is by capacitor C _ST2AB constitutes with analogue buffer.

Fig. 5 A, Fig. 5 B and Fig. 5 C illustrate the image element circuit P into Fig. 3 ₁The circuit diagram of sharing process in the electric charge of different phase.The image element circuit P that Fig. 5 A～Fig. 5 C is illustrated ₁In first and second voltage working storage be the enforcement aspect that adopts Fig. 4 A to be disclosed.

Fig. 5 A illustrates and is image element circuit P ₁Share voltage sampling stage synoptic diagram in the process in electric charge.Please refer to Fig. 5 A.In this voltage sampling in the stage, the first sampling switch SA ₁₁Open, and the first output switch S B ₁₁Close, make the first storage capacitors C _ST1ACharge to first sampling voltage (that is action of sampling).Suppose that first sampling voltage is V _R1, then this moment node N voltage V _REqual V _R1

Fig. 5 B illustrates and is image element circuit P ₁The voltage of sharing in the process in electric charge keeps the stage synoptic diagram.Please refer to Fig. 5 B, in this voltage maintenance stage, the first sampling switch SA ₁₁Close, and the first output switch S B ₁₁Also be still and close, so the voltage V of node N _RMaintain the first storage capacitors C _ST1AGo up (that is the action that keeps).Simultaneously, reset switch SR ₁Open, and the second output switch S B ₁₂Also close, make liquid crystal capacitance C _LC1Pixel electrode on voltage V _PCan discharge and recharge to reset voltage V _RST

Fig. 5 C illustrates and is image element circuit P ₁Share the stage synoptic diagram in the electric charge that electric charge is shared in the process.Please refer to Fig. 5 C, share in the stage reset switch SR in this electric charge ₁Close, and the first output switch S B ₁₁Then open, make storage capacitors C _ST1AWith liquid crystal capacitance C _LC1Carry out electric charge and share, until the voltage V of node N _REqual liquid crystal capacitance C _LC1Pixel electrode on voltage V _PSuppose that electric charge shares the voltage V after the balance _PBe V _P1, then as can be known after electric charge is shared balance, V _R=V _P=V _P1Because storage capacitors C _ST1AWith liquid crystal capacitance C _LC1Carry out electric charge and share in the process, electric charge only can or not run off in mutual transfer, so storage capacitors C _ST1AThe electric charge that is lost can equal liquid crystal capacitance C _LC1Resulting electric charge.Below storage capacitors C will be described _ST1AWith liquid crystal capacitance C _LC1Carry out the operational formula that electric charge is shared.

In following formula, C _LC1With C _ST1ARepresenting the capacitance of corresponding capacity cell.Storage capacitors C _ST1AThe electric charge that is lost can be expressed as (C _ST1A* (V _R1-V _P1)).Liquid crystal capacitance C _LC1Resulting electric charge can be expressed as (C _LC1* (V _P1-V _RST)).Formula is as follows:

$C_{\mathrm{ST}1A}\&CenterDot;(V_{R1}-V_{P1})={\mathrm{<figure-callout\; id="1"\; label="C\; LC"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">C</figure-callout>}}_{\mathrm{LC}}\&CenterDot;(V_{P1}-V_{\mathrm{RST}})$

$\&RightArrow;{\mathrm{<figure-callout\; id="1"\; label="V\; R"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_R=\frac{{\mathrm{<figure-callout\; id="1"\; label="C\; LC"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">C</figure-callout>}}_{\mathrm{LC}}\&CenterDot;(V_{P1}-V_{\mathrm{RST}})}{C_{\mathrm{ST}1A}}+{\mathrm{<figure-callout\; id="1"\; label="V\; P"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_P$

$\&RightArrow;{\mathrm{<figure-callout\; id="1"\; label="V\; R"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_R=\frac{(C_{\mathrm{ST}1A}+C_{\mathrm{LC}1})}{C_{\mathrm{ST}1A}}\&CenterDot;V_{P1}-\left(\frac{C_{\mathrm{LC}1}}{C_{\mathrm{ST}1A}}\right)\&CenterDot;V_{\mathrm{RST}},$

And work as V _RST=0 o'clock,

${\mathrm{<figure-callout\; id="1"\; label="V\; R"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_R=\frac{(C_{\mathrm{ST}1A}+C_{\mathrm{LC}1})}{C_{\mathrm{ST}1A}}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="V\; P"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_P,$

Therefore electric charge is shared the voltage V of the pixel electrode after the balance _P1Voltage V with the storage capacitors storage _R1Relation can be expressed as:

${\mathrm{<figure-callout\; id="1"\; label="V\; P"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_P=\frac{C_{\mathrm{ST}1A}}{(C_{\mathrm{ST}1A}+C_{\mathrm{LC}1})}\&CenterDot;{\mathrm{<figure-callout\; id="1"\; label="V\; R"\; filenames="H200810212912XE00052.png"\; state="\{\{state\}\}">V</figure-callout>}}_R.$

In more than describing, only export liquid crystal capacitance C at first sampling voltage _LC1Process describe, but in fact, second sampling voltage exports liquid crystal capacitance C to _LC1Process the same, and simultaneously, carry out alternately, to save the running time.When the first voltage working storage when storing first sampling voltage, the second voltage working storage then is to liquid crystal capacitance C in transmission second sampling voltage _LC1When the first voltage working storage is transmitting first sampling voltage to liquid crystal capacitance C _LC1The time, the second voltage working storage is storing second sampling voltage.As mentioned above, data-signal write time and the monochromatic source action of lighting of an image element circuit between the demonstration of the demonstration of a subframe and next subframe carried out simultaneously, so the time that monochromatic source is lighted is prolonged.Hold the image element circuit P of previous narration ₁Operation principles, function mode and its display effect of a pel array below will be described.

Fig. 6 illustrates the time sequential routine figure into the color sequence LCD of one embodiment of the invention.The LCD 200 that this LCD for example illustrates for Fig. 2.The display panels 210 of supposing described LCD is the image element circuit of one (i*j) array, comprises that j bar data line, 2*i bar sweep trace (can be divided into i bar odd number bar sweep trace G _OddWith i bar even number bar sweep trace G _Even), i bar first, second and the 3rd control signal RST, OB ₁～OB _i, OA ₁～OA _i, and (i*j) individual image element circuit, wherein the principle of operation of LCD 200 has been disclosed in the system block diagrams embodiment of the LCD 200 that Fig. 2 illustrates, and the principle of operation of display panels 210 has been disclosed in (2*2) image element circuit P that Fig. 3 illustrates ₁～P ₄Circuit diagram embodiment.Present embodiment will illustrate the time sequential routine flow process of the color sequence LCD of one (i*j) pixelated array circuit display panels with the principle of above-mentioned two embodiment.

Fig. 6 illustrates four subframes of the color sequence LCD of present embodiment: the red sub-frame of the red sub-frame of N frame, green sub-frame, blue subframe and (N+1) individual frame.In the red sub-frame of N frame, the first control signal RST of all row image element circuits can open (illustrating as Fig. 6) earlier, to open the reset switch of all image element circuits in the display panels 210, so that the liquid crystal capacitance of all image element circuits is reset.This moment, all first and second sampling switches and first and second output switch were all closed.After the liquid crystal capacitance replacement of all image element circuits finished, the first control signal RST of all row image element circuits can close.

Then, the second control signal OB of all row image element circuits ₁～OB _iCan open simultaneously (illustrating),, export to respectively on the corresponding liquid crystal capacitance in synchronization will in the blue subframe of (N-1) individual frame, being stored in the red data signal of the second voltage working storage of all row image element circuits as Fig. 6.The liquid crystal stage of reaction and the demonstration stage of the red sub-frame of N the frame that this action corresponding diagram 6 illustrates, and the action that the red data signal writes belongs to the red data write phase (not being illustrated in Fig. 6) of the blue subframe of (N-1) individual frame.

In the red sub-frame of N frame, when the red data signal showed, the green data signal also stored.At first, sweep trace G _OddArticle one sweep trace G ₁Open, make all data lines export respectively in the first voltage working storage of other green data signal to the first row image element circuit of branch.The green data signal writes after the first row image element circuit finishes, scanning linear G ₁Close, and sweep trace G _OddSecond sweep trace G ₃Open immediately, so that all data lines are exported other green data signal of branch respectively to the first voltage working storage of secondary series image element circuit.

As mentioned above, odd number bar sweep trace G _Odd(that is G ₁, G ₃To G _2i-1) open first sampling switch of each row image element circuit in regular turn from the first row pixel to last row pixel, the data-signal of data line is inputed in the first voltage working storage of image element circuit of respective column.In other words, the first voltage working storage of all image element circuits all can store the data-signal that a data line is provided.Green data signal write phase in the red sub-frame of N the frame that the action of the above-mentioned first voltage temporary memory stores green data signal illustrates corresponding to Fig. 6.Observing the red sub-frame of N the frame of Fig. 6 can find, when the green data signal write, the red data signal also showed, after each row image element circuit writes the green data signal in regular turn, and the red data signal show finish after, just enter next subframe-green sub-frame.

In the green sub-frame of N frame, the first control signal RST can open (as shown in Figure 6) earlier, to open the reset switch of all row image element circuits, so that the liquid crystal capacitance of all pixels is reset.This moment, all first and second sampling switches and first and second output switch all were (the illustrating as Fig. 6) of closing.After replacement finished, the first control signal RST closed once again.

Then, the 3rd control signal OA ₁～OA _iOpen simultaneously,, export corresponding liquid crystal capacitance respectively in synchronization will in the red sub-frame of N frame, being stored in the green data signal of the first voltage working storage.The liquid crystal stage of reaction and the demonstration stage of the green sub-frame that this action corresponding diagram 6 illustrates.When the green data signal showed, data blue signal also write.At first, sweep trace G _EvenArticle one sweep trace G ₂Open, make all data lines distinguish in the second voltage working storage of output blue data to the first row image element circuits.Data blue signal writes after the first row image element circuit finishes, scanning linear G ₂Close, and G _EvenSecond sweep trace G ₄Open immediately, so that all data lines difference output blue data-signals are to the second voltage working storage of secondary series image element circuit.

As mentioned above, even number bar sweep trace G _Odd(that is G ₂, G ₄To G _2i) open second sampling switch of each row image element circuit in regular turn from the first row pixel to last row pixel, the data-signal of data line is inputed in the second voltage working storage of respective column pixel.In other words, the second voltage working storage of all image element circuits all can store the data-signal that a data line is provided.The data blue signal write phase of the green sub-frame that the action of the above-mentioned second voltage temporary memory stores data-signal illustrates corresponding to Fig. 6.Data blue signal is by row when writing, and the green data signal also shows, after each row image element circuit writes data blue signal in regular turn, and the green data signal show finish after, just enter next subframe-blue subframe.

The function mode of blue subframe is identical with aforementioned green and red sub-frame, by the second voltage working storage output blue data-signal of each pixel to liquid crystal capacitance to show blue subframe, the first voltage working storage then stores the red data signal.The blue subframe of N frame show finish after, the red sub-frame that promptly enters (N+1) individual frame, by the first voltage working storage output red data-signal of each pixel to liquid crystal capacitance to show red sub-frame.

In sum, in the image element circuit of color sequence LCD of the present invention, the first voltage working storage and the second voltage working storage are arranged, wherein the first or second voltage working storage is when readout data signal, another first or second voltage working storage transmission of data signals to liquid crystal capacitance with display frame.The data-signal that this circuit structure and function mode can be carried out subframe simultaneously writes the operation that shows with data-signal, and the monochromatic source that prolongs pixel is lighted the time.In addition, therefore the present invention can once export to the liquid crystal capacitance of each pixel with display frame with the data-signal of entire frame because adopt the circuit structure of taking a sample with maintenance after each row is taken a sample one by one and kept.The mode of operation of this frame liquid crystal reaction, the uneven phenomenon of liquid crystal reaction that can avoid the reaction of row sequence liquid crystal to be hidden.In addition, because that the monochromatic source of image element circuit of the present invention is lighted the time is longer, therefore can operates the color sequence display of higher frequency, and further reduce the phenomenon of color-separated.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any affiliated technical field technician, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.

Claims (18)

1. the image element circuit of a color sequence LCD is characterized in that, described image element circuit comprises:

One first sampling switch is used to transmit one first sampling voltage during one first subframe;

One second sampling switch is used to transmit one second sampling voltage during one second subframe;

One first voltage working storage couples described first sampling switch, is used to keep in described first sampling voltage during described first subframe, and exports described first sampling voltage during described second subframe;

One second voltage working storage is used to keep in described second sampling voltage during described second subframe, and exports described second sampling voltage during described first subframe;

One first output switch couples the described first voltage working storage, is used to transmit described first sampling voltage during described second subframe;

One second output switch couples the described second voltage working storage, is used to transmit described second sampling voltage during described first subframe;

One liquid crystal capacitance couples described first output switch and the described second output switch and uses voltage altogether, is used to receive described second sampling voltage during described first subframe, receives described first sampling voltage during described second subframe; And

One reset switch, couple described liquid crystal capacitance, be used to the described first output switch before described first sampling voltage of output during described second subframe, transmit a reset voltage with the described liquid crystal capacitance of resetting, before described second sampling voltage of output during described first subframe, transmit a reset voltage in the described second output switch with the described liquid crystal capacitance of resetting.

2. the image element circuit of color sequence LCD as claimed in claim 1 is characterized in that, described first with the described second voltage working storage be the capacitor voltage working storage.

3. the image element circuit of color sequence LCD as claimed in claim 2 is characterized in that, described first voltage working storage and the described second voltage working storage are made of at least one electric capacity respectively.

4. the image element circuit of color sequence LCD as claimed in claim 2 is characterized in that, the described first voltage working storage is made of an electric capacity and an analogue buffer, and the described second voltage working storage is made of an electric capacity and an analogue buffer.

5. the image element circuit of color sequence LCD as claimed in claim 2 is characterized in that, during described first subframe, sees through the described second voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of described liquid crystal capacitance.

6. the image element circuit of color sequence LCD as claimed in claim 2 is characterized in that, during described second subframe, sees through the described first voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of described liquid crystal capacitance.

7. a color sequence LCD is characterized in that, described display comprises:

One display panels comprises at least:

One image element circuit comprises:

One first sampling switch is used to transmit one first sampling voltage during one first subframe;

One second sampling switch is used to transmit one second sampling voltage during one second subframe;

One first voltage working storage couples described first sampling switch, is used to keep in described first sampling voltage during described first subframe, and exports described first sampling voltage during described second subframe;

One second voltage working storage is used to keep in described second sampling voltage during described second subframe, and exports described second sampling voltage during described first subframe;

One first output switch couples the described first voltage working storage, is used to transmit described first sampling voltage during described second subframe;

One second output switch couples the described second voltage working storage, is used to transmit described second sampling voltage during described first subframe;

One liquid crystal capacitance couples described first output switch and the described second output switch and uses voltage altogether, is used to receive described second sampling voltage during described first subframe, receives described first sampling voltage during described second subframe; And

One reset switch, couple described liquid crystal capacitance, be used to the described first output switch before described first sampling voltage of output during described second subframe, transmit a reset voltage with the described liquid crystal capacitance of resetting, before described second sampling voltage of output during described first subframe, transmit a reset voltage in the described second output switch with the described liquid crystal capacitance of resetting.

8. color sequence LCD as claimed in claim 7 is characterized in that, described display panels comprises more at least:

One first sweep trace couples described first sampling switch, is used to receive one first sweep signal during described first subframe, so that described first sampling switch of energy;

One second sweep trace couples described second sampling switch, is used to receive one second sweep signal during described second subframe, so that described second sampling switch of energy; And

One data line couples described first sampling switch and described second sampling switch, and being used to provides described first sampling voltage during described first subframe, and described second sampling voltage is provided during described second subframe.

9. color sequence LCD as claimed in claim 8 is characterized in that, described display more comprises:

Time schedule controller;

One gate drivers couples and is controlled by described time schedule controller, is used to produce described first sweep signal to described first sweep trace during described first subframe, produces described second sweep signal to described second sweep trace during described second subframe; And

The one source pole driver couples and is controlled by described time schedule controller, is used to produce described first sampling voltage to described data line during described first subframe, produces described second sampling voltage to described data line during described second subframe.

10. color sequence LCD as claimed in claim 9 is characterized in that described LCD more comprises a light-emitting diode (LED) backlight module, in order to provide described display panels required area source.

11. color sequence LCD as claimed in claim 7, it is characterized in that, described LCD more comprises a control module, couple described first output switch and described second output switch and the described reset switch, be used to the described first output switch before described first sampling voltage of output during described second subframe, provide one first control signal so that the described reset switch of energy, before described second sampling voltage of output during described first subframe, provide one first control signal in the described second output switch so that can described reset switch.

12. color sequence LCD as claimed in claim 11, it is characterized in that, described LCD more comprises a reset voltage generator, couple described reset switch, be used to the described first output switch before described first sampling voltage of output during described second subframe, provide described reset voltage to described reset switch, before described second sampling voltage of output during described first subframe, provide described reset voltage to described reset switch in the described second output switch.

13. color sequence LCD as claimed in claim 11, it is characterized in that, described control module is more behind the described liquid crystal capacitance of resetting during described first subframe, provide one second control signal so that the described second output switch of energy, behind the described liquid crystal capacitance of resetting during described second subframe, provide one the 3rd control signal so that can the described first output switch.

14. color sequence LCD as claimed in claim 7 is characterized in that, described first with the described second voltage working storage be the capacitor voltage working storage.

15. color sequence LCD as claimed in claim 14 is characterized in that, described first voltage working storage and the described second voltage working storage are made of at least one electric capacity respectively.

16. color sequence LCD as claimed in claim 14 is characterized in that, the described first voltage working storage is made of an electric capacity and an analogue buffer, and the described second voltage working storage is made of an electric capacity and an analogue buffer.

17. color sequence LCD as claimed in claim 14 is characterized in that, during described first subframe, sees through the described second voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of described liquid crystal capacitance.

18. color sequence LCD as claimed in claim 14 is characterized in that, during described second subframe, sees through the described first voltage working storage and shares the GTG that can determine described image element circuit with the electric charge of described liquid crystal capacitance.

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