CN1904705A - Electro-optical device, method of driving electro-optical device, and electronic apparatus - Google Patents
Electro-optical device, method of driving electro-optical device, and electronic apparatus Download PDFInfo
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Abstract
An electro-optical device includes a plurality of scanning lines; a plurality of data lines; a plurality of pixels that are provided so as to correspond to intersections between the plurality of scanning lines and the plurality of data lines, each of the pixels has a pixel electrode, and a switching element that allows, when the selection voltage is applied to the scanning line, the data line and the pixel electrode to enter a conductive state; a scanning line driving circuit that supplies a selection voltage for selecting the plurality of scanning lines in a predetermined order; and a data line driving circuit that supplies, when the scanning line is selected, an image signal to the corresponding data line in accordance with a gray-scale level of the corresponding pixel. Further, an entire screen display mode in which an entire screen is displayed and a partial display mode in which a part of an entire screen is set to a display region and the other portion is set to a non-display region are selected, and the scanning line driving circuit supplies a first voltage to the scanning lines of the display region for a predetermined period in the entire screen display mode, and supplies a second voltage to the scanning lines of the display region for a period longer than the predetermined period in the partial display mode.
Description
Technical field
The present invention relates to the electronic equipment that for example uses electro-optical device, this method of driving electro-optical device of electro-optical substances such as liquid crystal and have electro-optical device.
Background technology
In the past, being used for the electro-optical devices such as liquid crystal indicator of display image, has been well-known.Electro-optical device for example possesses liquid crystal panel and is used for driving the driving circuit of this liquid crystal panel.This electro-optical device for example is following structure.
Electro-optical device possesses: liquid crystal panel; Liquid crystal display drive circuit is used for driving this liquid crystal panel; Control circuit is used for controlling this liquid crystal display drive circuit; And the liquid crystal drive power circuit, be used for supplying with driving voltage to them.Liquid crystal display drive circuit possesses scan line drive circuit and data line drive circuit.
Liquid crystal panel comprises: device substrate, and its following thin film transistor (TFT) as on-off element (below, be called TFT) is configured to rectangular; The subtend substrate is with this device substrate subtend configuration; And, be arranged between device substrate and the subtend substrate as the liquid crystal of electro-optical substance.
Device substrate possesses: the multi-strip scanning line is provided with every predetermined space; Many data lines with these sweep traces quadrature roughly, and are provided with every predetermined space; And electric capacity line and multi-strip scanning line almost parallel and be arranged alternately.
Cross part office at each sweep trace and each data line is provided with pixel.This pixel also comprises except that above-mentioned TFT: pixel electrode; And memory capacitance, connection one end and the other end are connected with the electric capacity line on this pixel electrode.
On the grid of TFT, connect sweep trace, on the source of TFT, connect data line, in the leakage of TFT, connect pixel electrode and memory capacitance.
On the subtend substrate, many shared lines are set with multi-strip scanning line almost parallel.In addition, on the subtend substrate, form common electrode with the pixel electrode subtend, and these common electrodes are connected on the bridging line.
Above electro-optical device followingly carry out work.That is to say, select voltage, select all related pixel with predetermined sweep trace by pressing the line sequentially feeding.Then, synchronous with the selection of this pixel, data line is supplied with picture signal according to the gray shade scale of pixel.Whereby, to by selecting the selected whole pixels that go out of voltage to supply with picture signals, make view data write pixel electrode.
In this electro-optical device, electrode with common electrode is a reference voltage, the positive polarity that hockets writes with negative polarity and writes, this positive polarity writes with the voltage higher than the voltage of this common electrode and supplies with picture signal to data line, and this negative polarity writes with the voltage lower than the voltage of common electrode and supplies with picture signal to data line.
If the pixel electrode to pixel has write picture signal, then utilize the potential difference (PD) between this pixel electrode and the common electrode, apply driving voltage to liquid crystal.Thereby, change by the voltage level that makes picture signal, the orientation of liquid crystal and order are changed, utilize the gray shade scale of each pixel light modulation to show.
Also have, the driving voltage that applies to liquid crystal utilizes memory capacitance, than write picture signal during long 3 during in the scope, kept.
Here, in the superincumbent electro-optical device,, produce stray capacitance respectively between grid-leakage of TFT and between source-leakage.If the gate voltage of TFT ends, then the electric charge of being accumulated in electric charge of being accumulated in the memory capacitance and the pixel capacitance that is made of pixel electrode and common electrode comprises that stray capacitance reallocates.Its result is, pushes away (push-down) under the what is called that the voltage that produces pixel electrode descends and also descends to the voltage that liquid crystal applies.
No matter push away under this in positive polarity writes, still in negative polarity writes, all take place often.Therefore, press the amount that pushes away voltage, set than the voltage VCOM height of common electrode as the center voltage Vc of positive picture signal and negative picture signal central value.
In addition, above electro-optical device for example is used in the portable set.For this portable set, people require the further attenuating of power consumption always in recent years.Therefore, be not on whole of display frame, show as mentioned above (below, this situation is called whole display mode), and only be shown on the part of display frame (below, this situation is called part (part) display mode), seek to save powerization (for example, referring to patent documentation 1) with this.
In the electro-optical device shown in this patent documentation 1, under the part display mode, display frame is divided into viewing area and non-display area, and on the viewing area, shows battery allowance and time showing etc., what does not show on non-display area.That is to say, during often bright attitude, when display white on non-display area, often dark attitude, on non-display area, show black.
Under this part display mode, identical with whole above-mentioned display mode, if center voltage Vc with picture signal, press and push away voltage and set than the voltage VCOM height of common electrode, though then what does not show on non-display area, but but between pixel electrode and common electrode, always produce because of under push away the potential difference (PD) that voltage causes, cause power significantly to be consumed.
Therefore, under the part display mode,, the center voltage Vc of picture signal be set equally, lower the power consumption on the non-display area whereby with the voltage VCOM of common electrode in order to lower the power consumption on the non-display area.
Patent documentation 1: the spy opens the 2001-356746 communique
But, under the part display mode, though the center voltage Vc of picture signal and the voltage VCOM of common electrode are equated, just can lower the power consumption of non-display area, but on the viewing area, the center voltage Vc of picture signal presses the amount that pushes away voltage, becomes lower than the voltage VCOM of common electrode.Therefore, can produce the image quality that causes because of flicker on the viewing area descends.
Summary of the invention
Thereby purpose of the present invention can be in the decline of carrying out suppressing when part shows image quality for a kind of electro-optical device, method of driving electro-optical device and electronic equipment are provided.
Electro-optical device of the present invention possesses: the multi-strip scanning line; Many data lines; And a plurality of pixels, be provided with corresponding to the infall of above-mentioned sweep trace and above-mentioned data line; Can select to be used for to show whole the display mode and the following part display mode of whole image, this part display mode with the part zone on the above-mentioned whole image as the viewing area, with other zones as non-display area; It is characterized by, above-mentioned pixel has: pixel electrode; And on-off element, be used for when above-mentioned sweep trace has been applied selection voltage, making above-mentioned data line and pixel electrodes become conducting state; Possess: scan line drive circuit is used for supplying with the selection voltage of selecting above-mentioned sweep trace by predetermined order; And data line drive circuit, be used for when having selected above-mentioned sweep trace, above-mentioned data line being supplied with picture signal according to the gray shade scale of pixel; Above-mentioned scan line drive circuit is under above-mentioned whole display mode, sweep trace to above-mentioned viewing area is supplied with the 1st voltage by the scheduled period, under above-mentioned part display mode, the sweep trace of above-mentioned viewing area is pressed than supplying with the 2nd voltage during the above-mentioned scheduled period length.
According to the present invention, though under the part display mode, and compare the viewing area under whole the display mode and narrow down, but because do not change for 1 image duration, thereby on the viewing area, make during per 1 selection of sweep trace, than long during per 1 selection of whole display mode lower tracer.
For this reason, under the part display mode, can reduce on-off element relatively and be conducting state during deviation give pixel electrode fully write the influence that view data is brought during needed.Thereby the time that can guarantee pixel electrode is write view data, the look that can alleviate display image is inhomogeneous, suppresses the decline of image quality.
In electro-optical device of the present invention, preferably, above-mentioned the 1st voltage of above-mentioned the 2nd voltage ratio is low.
Known, it is proportional with the selection voltage of supplying with sweep trace to push away voltage down.
According to the present invention, because under the part display mode, it constitutes, will with whole display mode under compare low selection voltage and supply with sweep trace, thereby can make down and push away the voltage minimizing.Thereby the image quality that can suppress to cause because of flicker on the viewing area under the part display mode descends.
In addition, because under the part display mode, picture signal Vc presses and pushes away voltage, become lower than the voltage VCOM of common electrode, so have following problems, promptly on the viewing area, produce the image quality that causes because of flicker and descend, and produce the image retention of viewing area.
But, according to the present invention, owing to can make the following voltage that pushes away under the part display mode obtain reducing, thereby can alleviate the image retention of viewing area.
In addition, because under the part display mode, and compare under whole the display mode, reduced and supplied with the selection voltage of sweep trace, thereby can reduce power consumption.
In addition, because under the part display mode, and compare under whole the display mode, prolong during per 1 selection of sweep trace, thereby can lower from scan line drive circuit and supply with work clock when selecting voltage to sweep trace.Thereby, under the part display mode, further reduce power consumption.
; if reduced the selection voltage of supplying with to sweep trace; then the influence of the characteristic deviation of on-off element increases; on-off element be conducting state during produce deviation; can not fully write pixel electrode from the view data that data line drive circuit is supplied with, it is inhomogeneous to produce look on display image.
But, as mentioned above, because under the part display mode, with compare under whole the display mode prolonged per 1 selection of sweep trace during, thereby the time that can guarantee pixel electrode is write view data, the look that can alleviate display image is inhomogeneous, suppresses the decline of image quality.
In electro-optical device of the present invention, preferably, also possesses power circuit, with generating above-mentioned the 1st voltage and above-mentioned the 2nd voltage; Above-mentioned power circuit possesses charge pump circuit, is used for the voltage of being imported is boosted, and generates above-mentioned the 1st voltage and above-mentioned the 2nd voltage.
According to the present invention, possess power circuit, this power circuit has charge pump circuit, with generating the 1st voltage and the 2nd voltage.For this reason, as long as 1 this power circuit is arranged, scan line drive circuit just can be supplied with the selection voltage of the 1st voltage and the 2nd voltage to sweep trace, therefore with need compare with the power circuit that generates the 1st voltage with the situation of 2 power circuits of the power circuit that generates the 2nd voltage, can reduce circuit scale and power consumption sometimes.
In electro-optical device of the present invention, preferably, above-mentioned charge pump circuit possesses the multi-stage booster circuit that is connected in series, and above-mentioned the 1st voltage is generated by the booster circuit of above-mentioned final stage among multistage, and above-mentioned the 2nd voltage is generated by the booster circuit of above-mentioned centre among multistage.
According to the present invention, in charge pump circuit, multi-stage booster circuit is connected in series and is provided with, the 1st voltage that will be generated by the final stage booster circuit among multistage under whole display mode is as selecting voltage, and will supply with sweep trace by the 2nd voltage that middle booster circuit generated among multistage as selecting voltage under the part display mode.Therefore, under the part display mode, do not need to drive among the multi-stage booster circuit, than the booster circuit of middle the booster circuit that generates the 2nd voltage by back grade.Thereby, under the part display mode, can further reduce power consumption.
Electronic equipment of the present invention is characterized by, and possesses above-mentioned electro-optical device.
According to the present invention, have the effect identical with above-mentioned effect.
Method of driving electro-optical device of the present invention, wherein, this electro-optical device possesses: the multi-strip scanning line; Many data lines; And a plurality of pixels, be provided with corresponding to the infall of above-mentioned sweep trace and above-mentioned data line; Can select to be used for to show whole the display mode and the following part display mode of whole image, this part display mode with the part zone on the above-mentioned whole image as the viewing area, with other zones as non-display area; Being characterized as of this driving method, above-mentioned pixel has: pixel electrode; And on-off element, be used for when above-mentioned sweep trace has been applied selection voltage, making above-mentioned data line and pixel electrodes become conducting state; Supply is used for selecting by predetermined order the selection voltage of above-mentioned sweep trace, when having selected above-mentioned sweep trace to above-mentioned data line, gray shade scale according to pixel is supplied with picture signal, under above-mentioned whole display mode, sweep trace to above-mentioned viewing area is supplied with the 1st voltage by the scheduled period, under above-mentioned part display mode, the sweep trace of above-mentioned viewing area is pressed than supplying with the 2nd voltage during the above-mentioned scheduled period length.
According to the present invention, have the effect identical with above-mentioned effect.
Description of drawings
Fig. 1 is the block diagram of the related electro-optical device structure of expression the present invention the 1st embodiment.
Fig. 2 is the part amplification view of the liquid crystal panel of above-mentioned electro-optical device.
Fig. 3 is the block diagram of the liquid crystal drive of above-mentioned electro-optical device with power circuit.
What Fig. 4 represented is the display frame of liquid crystal panel under the part display mode.
Fig. 5 is the sequential chart under whole the display mode of above-mentioned electro-optical device.
Fig. 6 is the sequential chart under the part display mode of above-mentioned electro-optical device.
Fig. 7 is the circuit diagram of the related liquid crystal drive of the present invention's the 2nd embodiment with the charge pump circuit that power circuit possessed.
Fig. 8 is the circuit diagram of the related liquid crystal drive of the present invention's the 3rd embodiment with the charge pump circuit that power circuit possessed.
Fig. 9 is the stereographic map that the pocket telephone structure of above-mentioned electro-optical device is used in expression.
Symbol description
1 ... electro-optical device, 30 ... scan line drive circuit, 40 ... data line drive circuit, 50 ... the liquid crystal drive power circuit, 51,52 ... charge pump circuit, 100 ... device substrate (the 1st substrate), 110,110A, 110B, 110C ... sweep trace, 120,120A, 120B ... data line, 150 ... pixel, 151 ... TFT (on-off element), 155 ... pixel electrode, 156 ... common electrode, 200 ... subtend substrate (the 2nd substrate), 511 ... the 1st charge pump unit circuit, 512 ... the 2nd charge pump unit circuit, 521 ... the 3rd charge pump unit circuit, 522 ... the 4th charge pump unit circuit, 523 ... the 5th charge pump unit circuit, 3000 ... pocket telephone (electronic equipment).
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.Also have, in the embodiment below and the explanation of variation, enclose identical symbol, omit or simplify its explanation for identical structure important document.
＜the 1 embodiment 〉
Fig. 1 is the block diagram of the related electro-optical device 1 of the present invention's the 1st embodiment.
Electro-optical device 1 possesses: liquid crystal panel AA; Liquid crystal display drive circuit 10 is used for driving this liquid crystal panel AA; Control circuit 20 is used for controlling this liquid crystal display drive circuit 10; And liquid crystal drive is used for to liquid crystal panel AA and liquid crystal display drive circuit 10 service voltages with power circuit 50.Liquid crystal display drive circuit 10 possesses scan line drive circuit 30 and data line drive circuit 40.Control circuit 20 possesses display control unit 21 and view data converter section 22.
Fig. 2 is the part amplification view of liquid crystal panel AA.
Liquid crystal panel AA comprises (referring to Fig. 1): as the device substrate 100 of the 1st substrate, its following thin film transistor (TFT) as on-off element (below, be called TFT) 151 is configured to rectangular; As the subtend substrate 200 of the 2nd substrate, with this device substrate 100 subtends configuration; And, be arranged between device substrate 100 and the subtend substrate 200 as the liquid crystal of electro-optical substance.
Above-mentioned liquid crystal display drive circuit 10 is formed on the device substrate 100 of liquid crystal panel AA.
On the cross section of each sweep trace 110 and each data line 120, pixel 150 is set.This pixel 150 also comprises except that above-mentioned TFT151: pixel electrode 155; With memory capacitance 153, on this pixel electrode 155, connect an end, and the other end is connected with electric capacity line 140.
On the grid of TFT151, connect sweep trace 110, on the source of TFT151, connect data line 120, in the leakage of TFT151, connect pixel electrode 155 and memory capacitance 153.This TFT151 makes data line 120 and pixel electrode 155 and memory capacitance 153 become conducting state when sweep trace 110 has applied selection voltage.
On subtend substrate 200, many shared lines 130 are set with multi-strip scanning line 110 almost parallels.In addition, on subtend substrate 200, form common electrode 156 with pixel electrode 155 subtends ground, and these common electrodes 156 are connected on the bridging line 130.
Scan line drive circuit 30 is used for supplying with for each sweep trace 110 by the line order makes TFT151 become the selection voltage of conducting state.For example, if supplied with selection voltage for certain bar sweep trace 110, then the TFT151 that is connected with this sweep trace 110 all becomes conducting state, the pixel that selection is all related with this sweep trace 110.
Data line drive circuit 40 is used for picture signal is supplied with each data line 120, and the TFT151 by conducting state, and the pixel electrode 155 of pixel 150 is write view data successively.Here, data line drive circuit 40 with the voltage of common electrode 156 as reference voltage, the positive polarity that hockets writes with negative polarity and writes, this positive polarity writes with the voltage higher than the voltage of this common electrode 156 data line 120 is supplied with picture signal, and this negative polarity writes with the voltage lower than the voltage of common electrode 156 data line 120 is supplied with picture signal.
This data line drive circuit 40 for example adopts the anti-phase type of drive of 1H to drive in order to prevent the image retention of liquid crystal, and the anti-phase type of drive use of this 1H alternating voltage hockets to per 1 horizontal line, and positive polarity writes or negative polarity writes.
View data converter section 22 is used for the picture signal that will be imported, writes or negative polarity writes and changes according to positive polarity, exports to data line drive circuit 40.
Fig. 3 is the block diagram of liquid crystal drive with power circuit 50.Liquid crystal drive is used for to scan line drive circuit 30, data line drive circuit 40 and liquid crystal panel AA difference service voltage with power circuit 50.
Voltage as liquid crystal drive is supplied with 50 pairs of scan line drive circuits 30 of power circuit comprises: TFT forward voltage during as the common display mode of the 1st voltage is used for making TFT151 become conducting state under the display mode usually; The TFT forward voltage is used for making TFT151 become conducting state under the part display mode during as the part display mode of the 2nd voltage; The TFT cut-off voltage is used for making TFT151 become cut-off state under display mode and the part display mode usually; Aanalogvoltage and simulation GND are used for the simulation part of driven sweep line drive circuit 30; And digital voltage and digital GND, be used for the digital section of driven sweep line drive circuit 30.
In addition, as the voltage that liquid crystal drive is supplied with 50 pairs of data line drive circuits of power circuit 40, comprising: positive polarity writes voltage, writes fashionable use in positive polarity; Negative polarity writes voltage, writes fashionable use in negative polarity; Aanalogvoltage and simulation GND are used for the simulation part of driving data line drive circuit 40; And digital voltage and digital GND, be used for the digital section of driving data line drive circuit 40.
In addition,, comprising with the voltage that the 50 couples of liquid crystal panel AA of power circuit supply with as liquid crystal drive: common electrode voltage is used for setting the voltage of common electrode 156; With digital voltage and digital GND, be used for driving liquid crystal panel AA.
Above electro-optical device 1 under whole display mode, followingly carry out work.
The TFT forward voltage is as selecting voltage during the common display mode of scan line drive circuit 30 by conduct the 1st voltage that will be supplied with power circuit 50 from liquid crystal drive, press line sequentially feeding sweep trace 110, select all the pixel 150 related with predetermined sweep trace 110.Synchronous with the selection of this pixel 150,40 pairs of data lines of data line drive circuit 120 are supplied with picture signal.Whereby, to supplying with picture signals, view data is write pixel electrode 155 by the selected whole pixels that go out of scan line drive circuit 30.
If pixel electrode 155 has been write view data, then utilize the potential difference (PD) between pixel electrode 155 and the common electrode 156, liquid crystal is applied driving voltage.Thereby, change by the voltage level that makes picture signal, the orientation of liquid crystal and order are changed, utilize the gray shade scale of each pixel light modulation to show.
Also have, the driving voltage that liquid crystal applied utilized memory capacitance 153, than write picture signal during long 3 during in the scope, kept.
In addition, top electro-optical device 1 followingly carries out work under the part display mode.
What Fig. 4 represented is the display frame of liquid crystal panel AA under the part display mode.
Under the part display mode, display frame 70 is divided into viewing area 71 and clips this viewing area 71 and the non-display area 72 of setting.Show battery allowance and time showing etc. on viewing area 71, what does not show on non-display area 72.That is to say that non-display area is when bright attitude often, display white when dark attitude often, shows black.
Under this part display mode, narrow down though compare the viewing area with whole display mode, do not change for 1 image duration.For this reason, on viewing area 71, during per 1 selection of sweep trace 110 than elongated during per 1 selection of whole display mode lower tracer 110.
In addition because non-display area 72 what does not show, so by the frequency lower, for example by 1 frame of 5 frame updates than viewing area 71.
Below, by reference Fig. 5, Fig. 6, describe for whole display mode of electro-optical device 1 and the work under the part display mode.
In Fig. 5, Fig. 6, GATE1～3, DATA1, PIX1 are respectively the voltage of pixel 150 set on the cross section of sweep trace 110A～C, the data line 120A of electro-optical device 1 and sweep trace 110A and data line 120A.In addition, VCOM is the voltage of common electrode 156, and Vc is the center voltage of the picture signal that writes of the picture signal that writes of positive polarity and negative polarity.
In addition, in Fig. 6, GATE1A, DATA1A, PIX1A are respectively the voltage of pixel set on the cross section of sweep trace, data line and the sweep trace of electro-optical device in the past and data line.
Fig. 5 is the sequential chart under whole the display mode of electro-optical device 1.
At first, during from moment t1 to t2, carry out positive polarity and write.That is to say that supply with by 30 couples of sweep trace 110A of scan line drive circuit and select voltage, making the voltage GATE1 of sweep trace 110A is VGH, makes the TFT151 of 1 horizontal line related with this sweep trace 110A all become conducting state.
Simultaneously, by data line drive circuit 40, with the voltage higher data line 120A is supplied with picture signal, and pixel electrode 155 is write view data by TFT151 than the voltage VCOM of common electrode 156.
Then, during from moment t2 to t3, carry out negative polarity and write.That is to say that supply with by 30 couples of sweep trace 110B of scan line drive circuit and select voltage, making the voltage GATE2 of sweep trace 110B is VGH, makes the TFT151 of 1 horizontal line related with this sweep trace 110B all become conducting state.
Simultaneously, by data line drive circuit 40, with the voltage lower data line 120A is supplied with picture signal, and pixel electrode 155 is write view data by TFT151 than the voltage VCOM of common electrode 156.
Then, during from moment t3 to t4, carry out positive polarity and write.That is to say that supply with by 30 couples of sweep trace 110C of scan line drive circuit and select voltage, making the voltage GATE3 of sweep trace 110C is VGH, makes the TFT151 of 1 horizontal line related with this sweep trace 110C all become conducting state.
Simultaneously, by data line drive circuit 40, with the voltage higher data line 120A is supplied with picture signal, and pixel electrode 155 is write view data by TFT151 than the voltage VCOM of common electrode 156.
As mentioned above, adopt the anti-phase type of drive of 1H, undertaken by per 1 horizontal line alternate repetition that positive polarity writes and negative polarity writes, generate 1 frame.
Fig. 6 is the sequential chart under the part display mode of electro-optical device 1.In Fig. 6, for easy to understand, no matter write fashionablely in positive polarity, or negative polarity writes fashionablely, all writes with identical gray shade scale.At this, during the selection of 1 horizontal line under the part display mode 3 times during the selection of 1 horizontal line under whole the display mode.Particularly, during from moment t5 to t6 with from moment t1 to t4 during equate.
At first, during from moment t5 to t6, carry out positive polarity and write.That is to say that supply with by 30 couples of sweep trace 110A of scan line drive circuit and select voltage, making the voltage GATE1 of sweep trace 110A is VGH2, makes the TFT151 of 1 horizontal line related with this sweep trace 110A all become conducting state.Here, VGH2 is 1/2 the voltage of VGH.
Simultaneously, by data line drive circuit 40, with the voltage VP1 higher data line 120A is supplied with picture signal, and pixel electrode 155 is write view data by TFT151 than the voltage VCOM of common electrode 156.
Under the part display mode, the TFT forward voltage is pressed line sequentially feeding sweep trace 110 as selecting voltage during the part display mode of conduct the 2nd voltage that scan line drive circuit 30 will be supplied with power circuit 50 from liquid crystal drive.For this reason, the voltage GATE1 of sweep trace 110A compares the voltage step-down with the voltage GATE1A of the sweep trace of electro-optical device in the past.
Then, at moment t6, make the TFT151 of 1 horizontal line related become cut-off state with sweep trace 110A by scan line drive circuit 30.So the electric charge of being accumulated in electric charge of being accumulated in the memory capacitance 153 and the pixel capacitance that is made of pixel electrode 155 and common electrode 156 comprises that stray capacitance Cgs, Cds reallocate, and pushes away under taking place.For this reason, the voltage PIX1 of pixel electrode 155 descends and becomes VP2, and the potential difference (PD) between the voltage VP2 of this pixel electrode 155 and the voltage VCOM of common electrode 156 is applied in to liquid crystal.
, during from moment t5 to t6, the voltage GATE1 of sweep trace 110A is lower than the voltage GATE1A of the sweep trace of electro-optical device in the past.For this reason, for the voltage PIX1A of the pixel of electro-optical device in the past, though under to push away voltage be (VP1-VP6), the voltage PIX1 of the pixel 150 of electro-optical device 1 pushes away voltage under it and but is (VP1-VP2).That is to say that electro-optical device 1 is compared with electro-optical device in the past, push away voltage down and reduced.
During from moment t6 to moment t7, the electric charge of being accumulated in pixel capacitance and the memory capacitance 153 discharges gradually, and the voltage PIX1 of pixel electrode 155 drops to VP3 from VP2.Also identical for electro-optical device in the past, the voltage PIX1A of pixel electrode drops to VP7 from VP6.
Then, during from moment t7 to moment t8, carry out negative polarity and write.That is to say that supply with by 30 couples of sweep trace 110A of scan line drive circuit and select voltage, making the voltage GATE1 of sweep trace 110A is VGH2, makes the TFT151 of 1 horizontal line related with this sweep trace 110A all become conducting state.
Simultaneously, by data line drive circuit 40, with the VP4 lower data line 120A is supplied with picture signal, and pixel electrode 155 is write view data by TFT151 than the voltage VCOM of common electrode 156.
Under the part display mode, the TFT forward voltage during the part display mode of conduct the 2nd voltage that scan line drive circuit 30 will be supplied with power circuit 50 from liquid crystal drive is pressed line sequentially feeding sweep trace 110 as selecting voltage.For this reason, the voltage GATE1 of sweep trace 110A compares the voltage step-down with the voltage GATE1A of the sweep trace of electro-optical device in the past.
Then, at moment t8, make the TFT151 of 1 horizontal line related become cut-off state with sweep trace 110A by scan line drive circuit 30.So the electric charge of being accumulated in electric charge of being accumulated in the memory capacitance 153 and the pixel capacitance that is made of pixel electrode 155 and common electrode 156 comprises that stray capacitance Cgs, Cds reallocate, and pushes away under taking place.For this reason, the voltage PIX1 of pixel electrode 155 descends and becomes VP5, and the potential difference (PD) between the voltage VP5 of this pixel electrode 155 and the voltage VCOM of common electrode 156 is applied in to liquid crystal.
, during from moment t7 to t8, the voltage GATE1 of sweep trace 110A is lower than the voltage GATE1A of the sweep trace of electro-optical device in the past.For this reason, for the voltage PIX1A of the pixel of electro-optical device in the past, though under to push away voltage be (VP4-VP8), the PIX1 of the pixel 150 of electro-optical device 1 pushes away voltage under it and but is (VP4-VP5).That is to say that electro-optical device 1 is compared with electro-optical device in the past, push away voltage down and reduced.
According to present embodiment, has following effect.
(1) owing to 3 times during the selection that is made as 1 horizontal line under whole the display mode during the selection with 1 horizontal line under the part display mode, thereby under the part display mode, can reduce relatively TFT151 become conducting state during deviation give pixel electrode 155 fully write the influence that view data is brought during needed.Thereby the time that can guarantee pixel electrode 155 is write view data, the look that can alleviate display image is inhomogeneous, suppresses the decline of image quality.
(2) under the part display mode because it constitutes, with whole display mode under compare low voltage and will select voltage to supply with sweep trace 110, thereby can make down and push away the voltage minimizing.Thereby, can alleviate the image retention and the flicker of the viewing area under the part display mode.
(3) under the part display mode because it constitutes, with whole display mode under compare low voltage and will select voltage supply sweep trace 110, thereby can reduce power consumption.
In addition, under the part display mode because with whole display mode under compare, elongated during per 1 selection of sweep trace 110, supply with work clock when selecting voltages so can lower from 30 pairs of sweep traces of scan line drive circuit 110.Thereby, on the part viewing area, further reduce power consumption.
＜the 2 embodiment 〉
Fig. 7 is the circuit diagram of the related charge pump circuit 51 of the present invention's the 2nd embodiment.Charge pump circuit 51 possesses in liquid crystal drive to be used in the power circuit 50, and possesses the 1st charge pump unit circuit 511 and the 2nd charge pump unit circuit 512.
The 1st charge pump unit circuit 511 possesses input terminal A, B and lead-out terminal C.The 1st charge pump unit circuit 511 is used for voltage to input terminal A and adds potential difference (PD) between input terminal A, B, and it is exported from lead-out terminal C.That is to say that the 1st charge pump unit circuit 511 makes the voltage of input terminal A roughly become 2 times, and it is exported from lead-out terminal C.
Particularly, the 1st charge pump unit circuit 511 possesses: capacitor 511A; On-off element 511B is used for the end side of this capacitor 511A is connected on input terminal A or the lead-out terminal C; On-off element 511C is used for the other end side of capacitor 511A is connected on input terminal A or the input terminal B; And capacitor 511D, one end side is connected with input terminal A, and other end side is connected with lead-out terminal C.
On-off element 511B, 511C will link mutually and switch.That is to say that when on-off element 511B was connected to the end side of capacitor 511A on the input terminal A, on-off element 511C was connected in the other end side of capacitor 511A on the input terminal B.On the other hand, when on-off element 511B was connected to the end side of capacitor 511A on the lead-out terminal C, on-off element 511C was connected in the other end side of capacitor 511A on the input terminal A.
At first, on-off element 511B is connected in the end side of capacitor 511A on the input terminal A, and on-off element 511C is connected in the other end side of capacitor 511A on the input terminal B.In this state, input terminal A is supplied with digital input voltage VDD, and input terminal B is supplied with digital GND.
So in capacitor 511A, digital voltage VDD is recharged.
Then, respectively change-over switch element 511B, 511C, on-off element 511B is connected in the end side of capacitor 511A on the lead-out terminal C, and on-off element 511C is connected in the other end side of capacitor 511A on the input terminal A.So in capacitor 511D, digital voltage 2VDD is recharged, this digital voltage 2VDD is digital voltage VDD after charging in capacitor 511A and the digital input voltage VDD sum of being supplied with from input terminal A.
As mentioned above, the 1st charge pump unit circuit 511 boosts roughly 2 times digital voltage 2VDD with digital input voltage VDD.This digital voltage 2VDD exports from lead-out terminal C, and is supplied to the 2nd charge pump unit circuit 512.
The 2nd charge pump unit circuit 512 its structures are identical with the 1st charge pump unit circuit 511.That is to say to possess input terminal B, C and lead-out terminal D.The 2nd charge pump unit circuit 512 is used for voltage to input terminal C and adds potential difference (PD) between input terminal B, C, and it is exported from lead-out terminal D.
Because input terminal C is supplied with digital voltage 2VDD, so the 2nd charge pump unit circuit 512 will boost roughly 2 times from the digital voltage 2VDD that the 1st charge pump unit circuit 511 is supplied with, just boost into roughly 4 times the digital voltage 4VDD of digital input voltage VDD, it is exported from lead-out terminal D.
Also have,, supply with the digital input voltage of 4V and the digital GND of 0V respectively from input terminal A, B to above-mentioned charge pump circuit 51.At this moment, charge pump circuit 51 is exported the digital voltage of 8V and 16V respectively from lead-out terminal C and lead-out terminal D.
In addition, for the electro-optical device that possesses above-mentioned charge pump circuit 51, the 1st voltage that makes TFT151 become conducting state under common display mode is 16V, and the 2nd voltage that makes TFT151 become conducting state under the part display mode is 8V.
According to present embodiment, except above-mentioned (1)～(3), also has following effect.
(4) charge pump circuit 51 outputs make TFT151 become the 1st voltage of conducting state under common display mode and make TFT151 become the 2nd voltage of conducting state under the part display mode.Therefore, as long as a liquid crystal drive power circuit with this charge pump circuit 51 is arranged, scan line drive circuit 30 just can be supplied with the selection voltage of the 1st voltage and the 2nd voltage to sweep trace 110.Thereby, with need with the power circuit that generates the 1st voltage with compare with the situation of power circuit with 2 liquid crystal drive of power circuit with the liquid crystal drive that generates the 2nd voltage, can reduce circuit scale and power consumption sometimes.
(5) in charge pump circuit 51, be connected in series as the charge pump unit circuit 511,512 of booster circuit 2 grades, be provided with, and under whole display mode, the voltage that will generate as the charge pump unit circuit 512 of the booster circuit of final stage is made as the selection voltage of the 1st voltage, under the part display mode, the voltage that will generate as the charge pump unit circuit 511 of the booster circuit of centre is made as the selection voltage of the 2nd voltage, supplies with sweep trace 110.For this reason, under the part display mode, do not need the work of driving be among the charge pump unit circuit 511,512 of booster circuit, compare the booster circuit that is positioned at the back level with following charge pump unit circuit 511, just the charge pump unit circuit 512, and above-mentioned charge pump unit circuit 511 is with the middle booster circuit that generates the 2nd voltage.Thereby, under the part display mode, can further reduce power consumption.
＜the 3 embodiment 〉
Fig. 8 is the circuit diagram of the related charge pump circuit 52 of the present invention's the 3rd embodiment.Be that digital input voltage is boosted and the value of the digital voltage exported with the difference of Fig. 7 charge pump circuit 51.Charge pump circuit 52 possesses in liquid crystal drive to be used in the power circuit, and possesses the 3rd charge pump unit circuit the 521, the 4th charge pump unit circuit 522 and the 5th charge pump unit circuit 523.
The 3rd charge pump unit circuit 521 possesses input terminal P, Q and lead-out terminal R.The 3rd charge pump unit circuit 521 is used for voltage to input terminal P and adds potential difference (PD) between input terminal P, Q, and it is exported from lead-out terminal R.That is to say that the 3rd charge pump unit circuit 521 makes the voltage of input terminal roughly become 2 times, and it is exported from lead-out terminal R.
Particularly, the 3rd charge pump unit circuit 521 possesses: capacitor 521A; On-off element 521B is used for the end side of this capacitor 521A is connected on input terminal P or the lead-out terminal R; On-off element 521C is used for the other end side of capacitor 521A is connected on input terminal P or the input terminal Q; And capacitor 521D, one end side is connected with lead-out terminal R, and other end side is connected with input terminal Q.
On-off element 521B, 521C will link mutually and switch.That is to say that when on-off element 521B was connected to the end side of capacitor 521A on the input terminal P, on-off element 521C was connected in the other end side of capacitor 521A on the input terminal Q.On the other hand, when on-off element 521B was connected to the end side of capacitor 521A on the lead-out terminal R, on-off element 521C was connected in the other end side of capacitor 521A on the input terminal P.
At first, on-off element 521B is connected in the end side of capacitor 521A on the input terminal P, and on-off element 521C is connected in the other end side of capacitor 521A on the input terminal Q.In this state, input terminal P is supplied with digital input voltage VDD, and input terminal Q is supplied with digital GND.
So in capacitor 521A, digital voltage VDD is recharged.
Then, respectively change- over switch element 521B, 521C, on-off element 521B is connected in the end side of capacitor 521A on the lead-out terminal R, and on-off element 521C is connected in the other end side of capacitor 521A on the input terminal P.So digital voltage 2VDD is recharged in capacitor 521D, this digital voltage 2VDD is that the digital voltage VDD after the charging reaches the digital input voltage VDD sum of being supplied with from input terminal P in capacitor 521A.
As mentioned above, the 3rd charge pump unit circuit 521 boosts roughly 2 times digital voltage 2VDD with digital input voltage VDD.This digital voltage 2VDD exports from lead-out terminal R, and is supplied to the 4th charge pump unit circuit 522.
The 4th charge pump unit circuit 522 its structures are identical with the 3rd charge pump unit circuit 521.That is to say to possess input terminal Q, R and lead-out terminal S.The 4th charge pump unit circuit 522 is used for voltage to input terminal R and adds potential difference (PD) between input terminal Q, R, and it is exported from lead-out terminal S.
Because input terminal R is supplied with digital voltage 2VDD, so the 4th charge pump unit circuit 522 boosts the digital voltage 2VDD that is supplied with from the 3rd charge pump unit circuit 521 to reach the digital input voltage VDD sum of being supplied with from input terminal R, just digital input voltage VDD is 3 times digital voltage 3VDD roughly, and it is exported from lead-out terminal S.
The 5th charge pump unit circuit 523 its structures are identical with the 3rd charge pump unit circuit the 521, the 4th charge pump unit circuit 522.That is to say to possess input terminal Q, S and lead-out terminal T.The 5th charge pump unit circuit 523 is used for voltage to input terminal S and adds potential difference (PD) between input terminal Q, S, and it is exported from lead-out terminal T.
Because input terminal S is supplied with digital voltage 3VDD, so the 5th charge pump unit circuit 523 boosts the digital voltage 3VDD that is supplied with from the 4th charge pump unit circuit 522 to reach the digital input voltage VDD sum of being supplied with from input terminal P, just digital input voltage VDD is 4 times digital voltage 4VDD roughly, and it is exported from lead-out terminal T.
Also have,, supply with the digital input voltage of 4V and the digital GND of 0V respectively from input terminal P, Q to above-mentioned charge pump circuit 52.At this moment, charge pump circuit 52 is exported the digital voltage of 8V, 12V and 16V respectively from lead-out terminal R, S, T.
In addition, for the electro-optical device that possesses above-mentioned charge pump circuit 52, the 1st voltage that makes TFT151 become conducting state under common display mode is 16V, and the 2nd voltage that makes TFT151 become conducting state under the part display mode is 8V.
According to present embodiment, have and the identical effect in above-mentioned (1)～(5).
＜variation 〉
Also have, the present invention is not limited to the respective embodiments described above, can reach distortion in the scope of the object of the invention, improvement etc. and be included among the present invention.
For example, in the respective embodiments described above, reach roughly 4 times digital voltage of digital input voltage, be not limited thereto, also can export and reach roughly 8 times digital voltage though charge pump circuit 51,52 can be exported.
In addition, in the respective embodiments described above, though the 2nd voltage is made as 1/2 voltage of the 1st voltage, being not limited thereto, also can be 1/3 or 1/4.
In addition, in the respective embodiments described above,, be not limited thereto, also can be used in the electro-optical device that adopts liquid crystal electro-optical substance in addition though apply the present invention to adopt in the electro-optical device 1 of liquid crystal.So-called electro-optical substance refers to, the material that the supply by electric signal (current signal or voltage signal) changes the optical characteristics of transmissivity and briliancy and so on.For example for various electro-optical devices such as following, also can identical use the present invention with above-mentioned embodiment, above-mentioned various electro-optical devices comprise: display panel, use organic EL (Electro Luminescent, electroluminescence) or OLED element such as luminous condensate, be used as electro-optical substance; Electrophoretic display panel uses a kind of microcapsules to be used as electro-optical substance, and these microcapsules comprise the liquid and the white particles that is scattered in this liquid after the dyeing; Reverse the ball display panel, use is reversed ball and is used as electro-optical substance, and this reverses ball different looks is painted in each different zone of polarity respectively; The toner display panel uses black toner to be used as electro-optical substance; And Plasmia indicating panel, use the gases at high pressure of helium or neon etc. to be used as electro-optical substance.
＜application example 〉
Below, the electronic equipment for using the related electro-optical device 1 of above-mentioned embodiment describes.
Fig. 9 is the stereographic map that the pocket telephone structure of electro-optical device 1 is used in expression.Pocket telephone 3000 possesses a plurality of operation push-buttons 3001, scroll button 3002 and electro-optical device 1.By operation scroll button 3002, the picture that is shown on the electro-optical device 1 is rolled.
Also have, as the electronic equipment that uses electro-optical device 1, except equipment shown in Figure 9, the equipment etc. that can also enumerate personal computer, information portable terminal device, Digital Still Camera, LCD TV, view finder formula and monitor direct viewing type video tape recorder, automobile navigation apparatus, pager, electronic notebook, desk-top electronic calculator, word processor, workstation, videophone, POS terminal and possess touch panel.And, as the display part of these various electronic equipments, can use above-mentioned electro-optical device.
Claims (7)
1. electro-optical device, it possesses: the multi-strip scanning line; Many data lines; And a plurality of pixels, its infall corresponding to above-mentioned multi-strip scanning line and above-mentioned many data lines is provided with; Can select to be used for to show whole the display mode and the part display mode of whole image, in this part display mode, with the part zone of above-mentioned whole image as the viewing area, with other zones as non-display area; It is characterized by,
Above-mentioned pixel has: pixel electrode; And on-off element, it is used for making above-mentioned data line and pixel electrodes become conducting state when above-mentioned sweep trace has been applied selection voltage;
Possess:
Scan line drive circuit, it is used for supplying with the selection voltage by the predetermined above-mentioned sweep trace of select progressively; With
Data line drive circuit, it is used for when above-mentioned sweep trace is selected, and above-mentioned data line is supplied with picture signal according to the gray shade scale of pixel;
Above-mentioned scan line drive circuit is under above-mentioned whole display mode, sweep trace to above-mentioned viewing area is supplied with the 1st voltage by the scheduled period, under above-mentioned part display mode, the sweep trace of above-mentioned viewing area is pressed than supplying with the 2nd voltage during the above-mentioned scheduled period length.
2. electro-optical device according to claim 1 is characterized by:
Above-mentioned the 1st voltage of above-mentioned the 2nd voltage ratio is low.
3. electro-optical device according to claim 1 is characterized by:
Under above-mentioned part display mode,
Above-mentioned scan line drive circuit is pressed the sweep trace of above-mentioned non-display area during the predetermined frame, supply with and select voltage, and above-mentioned data line drive circuit is supplied with cut-off voltage the data line of above-mentioned non-display area when this selection voltage is supplied to.
4. electro-optical device according to claim 1 and 2 is characterized by:
Also possess power circuit, this power circuit is with generating above-mentioned the 1st voltage and above-mentioned the 2nd voltage,
Above-mentioned power circuit possesses charge pump circuit, and this charge pump circuit is used for the voltage of being imported is boosted, and generates above-mentioned the 1st voltage and above-mentioned the 2nd voltage.
5. electro-optical device according to claim 4 is characterized by:
Above-mentioned charge pump circuit possesses the multi-stage booster circuit that is connected in series,
Above-mentioned the 1st voltage is generated by the booster circuit of above-mentioned final stage in multistage,
Above-mentioned the 2nd voltage is generated by the booster circuit of above-mentioned centre in multistage.
6. electronic equipment is characterized by:
Possesses each described electro-optical device in the claim 1 to 5.
7. method of driving electro-optical device, this electro-optical device has: the multi-strip scanning line; Many data lines; And a plurality of pixels, its infall corresponding to above-mentioned multi-strip scanning line and above-mentioned many data lines is provided with; Can select to be used for to show whole the display mode and the part display mode of whole image, this part display mode with the zone of the part of above-mentioned whole image as the viewing area, with other zones as non-display area; Being characterized as of this method of driving electro-optical device,
Above-mentioned pixel has: pixel electrode; And on-off element, it is used for making above-mentioned data line and pixel electrodes become conducting state when above-mentioned sweep trace has been applied selection voltage;
Supply with selection voltage by the predetermined above-mentioned sweep trace of select progressively,
When above-mentioned sweep trace is selected, above-mentioned data line is supplied with picture signal according to the gray shade scale of pixel,
Under above-mentioned whole display mode, the sweep trace of above-mentioned viewing area is supplied with the 1st voltage by the scheduled period, under above-mentioned part display mode, the sweep trace of above-mentioned viewing area is pressed than supplying with the 2nd voltage during the above-mentioned scheduled period length.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP215459/2005 | 2005-07-26 | ||
| JP2005215459 | 2005-07-26 | ||
| JP005739/2006 | 2006-01-13 |
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| CN1904705A true CN1904705A (en) | 2007-01-31 |
| CN100435010C CN100435010C (en) | 2008-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006101077576A Expired - Fee Related CN100435010C (en) | 2005-07-26 | 2006-07-25 | Electro-optical device, method of driving electro-optical device, and electronic apparatus |
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| CN (1) | CN100435010C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101685607B (en) * | 2008-09-27 | 2012-07-25 | 佛山市顺德区汉达精密电子科技有限公司 | Screen regional imaging system of display device |
| CN103595245A (en) * | 2012-08-15 | 2014-02-19 | 全视科技有限公司 | Capacitance selectable charge pump |
| CN106531110A (en) * | 2017-01-03 | 2017-03-22 | 京东方科技集团股份有限公司 | Driving circuit, driving method and display device |
| CN110412785A (en) * | 2018-04-26 | 2019-11-05 | 精工爱普生株式会社 | Electro-optical device, projection type image display apparatus |
| CN110648637A (en) * | 2018-06-26 | 2020-01-03 | 拉碧斯半导体株式会社 | Display device and display controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6522319B1 (en) * | 1998-02-09 | 2003-02-18 | Seiko Epson Corporation | Electro-optical device and method for driving the same, liquid crystal device and method for driving the same, circuit for driving electro-optical device, and electronic device |
| JP3576443B2 (en) * | 2000-02-04 | 2004-10-13 | シャープ株式会社 | Liquid crystal display |
| JP2001356746A (en) * | 2000-04-11 | 2001-12-26 | Sanyo Electric Co Ltd | Method and circuit for driving display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101685607B (en) * | 2008-09-27 | 2012-07-25 | 佛山市顺德区汉达精密电子科技有限公司 | Screen regional imaging system of display device |
| CN103595245A (en) * | 2012-08-15 | 2014-02-19 | 全视科技有限公司 | Capacitance selectable charge pump |
| CN103595245B (en) * | 2012-08-15 | 2016-03-02 | 全视科技有限公司 | Capacitance selectable charge pump |
| CN106531110A (en) * | 2017-01-03 | 2017-03-22 | 京东方科技集团股份有限公司 | Driving circuit, driving method and display device |
| CN106531110B (en) * | 2017-01-03 | 2022-01-18 | 京东方科技集团股份有限公司 | Driving circuit, driving method and display device |
| CN110412785A (en) * | 2018-04-26 | 2019-11-05 | 精工爱普生株式会社 | Electro-optical device, projection type image display apparatus |
| CN110412785B (en) * | 2018-04-26 | 2022-03-01 | 精工爱普生株式会社 | Electro-optical device and projection display device |
| CN110648637A (en) * | 2018-06-26 | 2020-01-03 | 拉碧斯半导体株式会社 | Display device and display controller |
| CN110648637B (en) * | 2018-06-26 | 2022-05-27 | 拉碧斯半导体株式会社 | Display device and display controller |
| CN113870778A (en) * | 2020-06-29 | 2021-12-31 | 精工爱普生株式会社 | Circuit device, electro-optical element, and electronic apparatus |
| CN113870778B (en) * | 2020-06-29 | 2023-06-23 | 精工爱普生株式会社 | Circuit device, electro-optical element, and electronic apparatus |
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