CN1344959A - Display device - Google Patents
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- CN1344959A CN1344959A CN01133177A CN01133177A CN1344959A CN 1344959 A CN1344959 A CN 1344959A CN 01133177 A CN01133177 A CN 01133177A CN 01133177 A CN01133177 A CN 01133177A CN 1344959 A CN1344959 A CN 1344959A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
- G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel
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- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Nonlinear Science (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
There is provided a display device to simplify the constitution of an external circuit of a display panel and to reduce power consumption. Holding circuits 110 are provided to sustain digital video signals from drain signal lines 61 in accordance with the signals inputted from gate signal lines 51. Signal selecting circuits 120 are provided to select either one of two signals (signals A and B) in accordance with the signals from the circuits 110 and supply the signals to pixel electrode 80. Moreover, a reference voltage generating circuit 500 which generates signals A and B is provided within a display panel 100. During a digital display mode, the circuit 500 generates the signals to be applied to the electrode 80. Therefore, it is not necessary to supply the signals A and B from the external.
Description
Technical field
The present invention relates to display device, particularly be suitable for the display device of the low consumpting power of portability display device.
Background technology
In recent years, the portable display device of market demand is for example carried TV, portable phone etc.According to such needs, actively carrying out and the miniaturization of display device, in light weight, the low corresponding research and development of consumed power.
Fig. 8 represents the circuit diagram of a display pixel of the liquid crystal indicator of conventional example.On insulativity substrate (not shown), signal line 51, drain signal line 61 intersect to form, and the TFT65 that is connected with two signal wires 51,61 is set near its cross part.The source electrode 11s of TFT65 is connected to the show electrode 80 of liquid crystal 21.
In addition, the auxiliary capacitor 85 that the voltage that makes show electrode 80 keeps 1 field interval is set, a terminal 86 of this auxiliary capacitor 85 is connected with the source electrode 11s of TFT65, applies the public current potential of each display pixel on another electrode 87.
Here, when signal line 51 was applied sweep signal, TFT65 became conducting state, from drain signal line 61 analog picture signal was sent to show electrode 80, and was kept by auxiliary capacitor 85.The picture signal that applies on the show electrode 80 is applied on the liquid crystal 21, liquid crystal 21 is orientated, can obtain liquid crystal display by this voltage.
Therefore, can obtain to show, and have nothing to do with dynamic image, still image.Under situation about rest image being presented on such liquid crystal indicator, the battery parameter that the image that for example shows dry cell on the part of the liquid crystal display part of portable phone is used as being used to driving portable phone shows.
But, identical even under the situation that shows rest image in the liquid crystal indicator of above-mentioned formation with the situation that shows dynamic image, make TFT65 become conducting state with sweep signal, picture signal need be write each display pixel again.
Therefore, because being in, the outside LSI that produces the driving circuit of drive signals such as sweep signal and picture signal and produce the various signals of the work timing that is used for control Driver Circuit often works, so consume very large power.Therefore, in only being furnished with power-limited portable phone, there is short such shortcoming of its up time.
To this, open the liquid crystal indicator that has disclosed in the flat 8-194205 patented claim each display pixel configuring static type storer (Japan) spy.The part of quoting this communique below illustrates, as shown in Figure 9, this liquid crystal indicator by with 2 grades of phase inverter INV1, INV2 as the storer of positive feedback form, be about to the holding circuit of static type storer as data image signal, thereby reduce consumed power.
Here, according to the diadic data image signal that keeps in the static type storer, the resistance value between on-off element 24 control line of reference Vref and the show electrode 80, the bias state of adjustment liquid crystal 21.On the other hand, AC signal Vcom is input to common electrode.Ideally, come modified-image if resemble the rest image, this device does not need the renewal to storer.
As mentioned above, in existing liquid crystal indicator, be fit to show the dynamic image of full color according to analog picture signal.On the other hand,, be fit to show the rest image of low key tone degree, and reduce consumed power at the liquid crystal indicator of being furnished with the static type storer that is used for keeping data image signal.
Summary of the invention
But, because the image signal source difference of two kinds of liquid crystal indicators, so in a display device, can not realize simultaneously that the dynamic image of full color shows and the rest image demonstration low with consumed power.
The present invention can realize that the rest image that dynamic image shows and consumed power is low of full color shows two kinds of such demonstrations with a display device (for example, a slice liquid crystal display panel) by a kind of display device.In addition, at the liquid crystal indicator of being furnished with the static type storer that is used for preserving data image signal, the present invention realizes highly integrated and low consumpting power.
The major part of following brief description the application invention disclosed.
Comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of the direction configuration that intersects of described signal line and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, be supplied to signal that high voltage and low-voltage, basis import from described signal line keep from the data image signal of described drain signal line holding circuit,
And according to select the 1st voltage and the 2nd voltage to supply with the corresponding configuration of signal selecting circuit of described pixel electrode from the signal of described holding circuit with described pixel electrode;
With output the described the 1st or/and the reference voltage generating circuit of the 2nd voltage be configured on the described substrate.
According to such structure, owing to do not need to supply with the 1st or/and the 2nd voltage so when digital picture shows external circuit is stopped fully, can be realized low consumpting power from the outside.
Comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of disposing of the described signal line direction of intersecting and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, comprise: holding circuit, be supplied to high voltage and low-voltage, keep data image signal from described drain signal line according to signal from the input of described signal line; And
Signal selecting circuit is according to selecting the 1st voltage and the 2nd voltage from the signal of this holding circuit and supplying with described pixel electrode;
Described the 2nd voltage is formed described the 1st voltage inversion by the phase inverter that forms on the described substrate.
According to such structure, because described the 2nd voltage carries out anti-phase formation by the phase inverter that forms on the described substrate with described the 1st voltage, so can eliminate the wiring that is used to transmit the 2nd voltage.Thus, can realize the highly integrated of display pixel.
Comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of disposing of the described signal line direction of intersecting and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, comprise: holding circuit, be supplied to high voltage and low-voltage, keep picture signal from described drain signal line according to signal from the input of described signal line; And
Signal selecting circuit is according to selecting the 1st voltage and the 2nd voltage from the signal of this holding circuit and supplying with described pixel electrode;
Described signal selecting circuit is by the 1st complementary transistor of selecting described the 1st voltage and select the 2nd complementary transistor of described the 2nd voltage to form.
According to such structure,,, realize low consumpting power so can reduce the operating voltage of holding circuit owing to constitute signal selecting circuit with complementary transistor.
Description of drawings
Fig. 1 is the circuit structure diagram of the liquid crystal indicator of the present invention the 1st embodiment.
Fig. 2 is the circuit structure diagram of the reference voltage generating circuit of the present invention the 1st embodiment.
Fig. 3 is another circuit structure diagram of the reference voltage generating circuit of the present invention the 1st embodiment.
Fig. 4 is the timing diagram of the liquid crystal indicator of the present invention the 1st embodiment.
Fig. 5 is the circuit structure diagram of the liquid crystal indicator of the present invention the 2nd embodiment.
Fig. 6 is the circuit structure diagram of the liquid crystal indicator of the present invention the 3rd embodiment.
Fig. 7 is the sectional view of reflection-type liquid-crystal display device.
The circuit structure diagram of the liquid crystal indicator of the conventional example of Fig. 8.
Fig. 9 is another circuit structure diagram of the liquid crystal indicator of conventional example.
Embodiment
Below, the display device of the detailed description embodiment of the invention.Fig. 1 represents the circuit structure diagram of the liquid crystal indicator of the present invention the 1st embodiment.
On insulativity substrate 10, along a plurality of signal lines 51 that a direction configuration is connected with the gate drivers 50 of supplying with sweep signal, the edge disposes a plurality of drain signal line 61 with the direction that these signal lines 51 intersect.
According to timing from the sampling pulse of drain driver 60 output, make sampling transistor SP1, SP2 ..., the SPn conducting, the data-signal (analog picture signal or data image signal) of data signal line 62 is supplied with drain signal line 61.
Liquid crystal display panel 100 is by constituting according to a plurality of display pixels of selecting and be supplied to from the sweep signal of signal line 51 from the rectangular configuration of the data-signal of drain signal line 61.
Below, the detailed structure of display pixel 200 is described.Near the cross part of signal line 51 and drain signal line 61, the circuit selection circuit 40 that P channel-type TFT41 and N channel-type 42 constitute is set.TFT41,42 two drain electrodes are connected with drain signal line 61, and their two grids are connected with circuit selection signal line 88.TFT41,42 makes one of them conducting according to the selection signal from circuit selection signal line 88.Setting is selected circuit 43 by the circuit that P channel-type TFT44 and N channel-type 45 constitute, and selects circuit 40 formation right with circuit.
Thus, can select to switch analog picture signal described later and show that (corresponding full color dynamic image) and digital picture show (low consumpting power, corresponding rest image).In addition, adjacent circuit selects circuit 40 to dispose the pixel selection circuit 70 that is made of N channel-type TFT71 and N channel-type TFT72.TFT71,72 selects the TFT41,42 of circuit 40 to be connected in parallel with circuit respectively, and signal line 51 is connected to their two grids.TFT71,72 have according to from the sweep signal both sides of signal line 51 by the structure of while conducting.
In addition, be provided for keeping the auxiliary capacitor 85 of analog picture signal.An electrode 86 of auxiliary capacitor 85 is connected with the source electrode of TFT71.Another electrode 87 is connected with public auxiliary capacitance line 81, is supplied to bias voltage V
SCIf make the gate turn-on of TFT71, analog picture signal is applied on the liquid crystal 21, then this signal must keep 1 field interval, but only in liquid crystal 21 this voltage of signals along with the time can descend gradually.So, can occur showing irregular, can not obtain good demonstration.Therefore, be provided for the auxiliary capacitor 85 that makes this voltage keep 1 field interval.
Between this auxiliary capacitor 85 and liquid crystal 21, the P channel-type TFT44 of circuit selection signal line 43 is set, form the structure of selecting the TFT41 conducting simultaneously of circuit 40 to end with circuit.
Between the show electrode 80 of the TFT72 of pixel selection circuit 70 and liquid crystal 21, holding circuit 110, signal selecting circuit 120 are set.Holding circuit 110 is made of 2 inverter circuits 111,112 of positive feedback, constitutes the static type storer that keeps the diadic numeral.Will be as the voltage V of supply voltage
DDWith voltage V
SS(voltage V
DD＞V
SS) 2 inverter circuits 111,112 of supply.In addition, in order to make 2 inverter circuits, 111,112 consumed powers low, CMOS type phase inverter preferably.
The opposite electrode signal V that 2 signals that signal selecting circuit 120 is selected are alternating voltages
COM(signal A) and with this opposite electrode signal V
COMThe AC driving signal that is used to drive liquid crystal (signal B) for the alternating voltage at center.Signal A and signal B are mutual anti-phase square-wave signals, and the voltage V to be used to drive
DDWith voltage V
SSBetween voltage come the inverter circuit 111,112 of AC driving holding circuit 110.
Here, select signal B during the TFT122 conducting, and select signal A during the TFT121 conducting.Signal A that selects or signal B supply with the show electrode 80 that liquid crystal 21 is applied voltage by the TFT45 of circuit selection signal line 43.With opposite electrode signal V
COM(=signal A) supplies with the opposite electrode 32 of liquid crystal 21.
And, above-mentioned 2 signal A, B also can supply with from the external circuit substrate 90 of liquid crystal display panel 100, but in the present embodiment, be arranged on the insulativity substrate 10 of liquid crystal display panel 100 by the reference voltage generating circuit 50 that will be used to produce signal A, signal B, thereby have the feature that does not need to supply with signal A and signal B from the outside.That is, same with holding circuit 110, with voltage V
DDWith voltage V
SSAs power supply voltage supplying reference voltage generating circuit 500, signal A and signal are based on voltage V
DDWith voltage V
SSForm.
Thus, can simplify the structure of circuit substrate 90 in addition.And, owing to when digital display mode, form signal A, the B that need in that liquid crystal display panel 100 is inner, thus from the outside supply line voltage V only
DD, V
SSThus, can stop circuit (screen board described later drives with circuit substrates 90 fully in addition such as LSI91) in addition fully, realize the low consumpting power of entire system.
The following describes the particular circuit configurations example of reference voltage generating circuit 50.As shown in Figure 2, inverter circuit 501 and inverter circuit 502 are connected in series, the output of inverter circuit 502 feeds back to the input of inverter circuit 501 by the capacitor 505 with capacitance C.The output of inverter circuit 501 feeds back to its input by the resistance 504 with resistance value R.
In said structure, can adjust oscillation frequency by the time constant of adjusting R and C.The 503rd, be used to adjust the inverter circuit of impact damper (Buffer) usefulness of waveform.With supply voltage V
DD, V
SSSupply with each inverter circuit 501,502,503 as driving power voltage separately.From the output of inverter circuit 503, can obtain above-mentioned signal A.In addition, by an inverter circuit being connected to the output of inverter circuit 503, can from the output of this inverter circuit, obtain and the anti-phase signal B of signal A.
The following describes another circuit structure example of reference voltage generating circuit 50.This circuit is a ring oscillator, and as shown in Figure 3, the inverter circuit 601,602,603 of odd number forms closed loop, produces vibration by its internal latency.This oscillation frequency can be adjusted by adjusting by the time constant of the capacitance C decision of the resistance value R of resistance 604 and capacitor 605.
Below, the peripheral circuit of liquid crystal screen 100 is described referring again to Fig. 1.Screen board is set on the tyre circuit substrate 90 of the substrate different with the insulativity substrate 10 of liquid crystal screen 100 to be driven and uses LSI91.From the screen board driving LSI91 of this tyre circuit substrate 90 vertical enabling signal STV is input to gate drivers 50, horizontal enabling signal STH is input to drain driver 60.In addition, picture signal is input to data line 62.
Below, the driving method of the display device of said structure is described with reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4.Fig. 4 is the timing diagram that liquid crystal indicator is selected digital display mode situation.
(1) situation of simulation display mode
According to mode signal MD, when selecting the simulation display mode, data signal line 62 is set at the state of output analog picture signal.In addition, become ' L ', make circuit select TFT41,44 conductings of circuit 40,43 from the selection signal of circuit selection signal line 88.
In addition, make sampling transistor SP conducting, the analog picture signal of data signal line 62 is supplied with drain signal line 61 according to sampled signal based on horizontal enabling signal STH.
According to vertical enabling signal STV, sweep signal is supplied with signal line 51.According to sweep signal, during the TFT71 conducting, analog picture signal Sig is sent to show electrode 80, and is kept by auxiliary capacitor 85 from drain signal line 61.The image signal voltage that applies on the show electrode 80 is applied on the liquid crystal 21,, is orientated, can obtain liquid crystal display by liquid crystal 21 according to this voltage.
In this simulation display mode, owing to the picture signal of input is imported gradually, so be fit to show the dynamic image of full color.Wherein, owing to drive them in the LSI91 of charged base board 90, each driver 50,60 outside, so constantly consume electric power.
(2) digital display mode
According to mode signal MD, when selecting digital display mode, data signal line 62 is set at the state of output digital image signal.Selection signal from the circuit selection signal line becomes ' H ', and holding circuit 110 becomes the state that can work.
In addition, make circuit select the TFT41,44 of circuit 40,43 to end, make TFT42,45 conductings simultaneously.
With LSI91 enabling signal STV, STH are input to gate drivers 50 and drain driver 60 respectively from the screen board driving of tyre circuit substrate 90.Produce sampled signal successively according to this signal, according to each sampled signal make sampling transistor SP1, SP2 ..., SPn successively conducting come digital signal Sig is sampled, and supply with each drain signal line 61.
Here, illustrate that the 1st goes, promptly applies the signal line 51 of sweep signal G1.At first, according to sweep signal G1, each display pixel P11, the P12 that is connected with signal line 51 ..., P1n each TFT conducting 1 horizontal scan period.
Pay close attention to the display pixel P11 of the 1st row the 1st row, the data image signal S11 that samples is outputed to drain signal line 61 according to sampled signal SP.Then, TFT72 becomes conducting state by sweep signal S11, this drain signal D1 is input to the holding circuit 110 of display pixel P11.
The signal that keeps in this holding circuit 110 is imported into signal selecting circuit 120, selects signal A or signal B by this signal selecting circuit 120, and the signal after this selection is applied on the show electrode 80, and this voltage is applied on the liquid crystal 21.
Like this, by scanning, the scanning of 1 picture amount (1 field interval), be that full spot scan finishes, thereby show 1 picture from the signal line 51 of the last row of signal line 51.
Here, when showing 1 picture, stop the screen board of gate drivers 50 and drain driver 60 and tyre is driven the voltage supply of using LSI91, stop their driving.Here, as mentioned above, signal A or signal B are produced by the reference voltage generating circuit 50 that is provided with on the insulativity substrate 10 of liquid crystal display panel 100.Therefore, only from the outside of liquid crystal display panel 100 to holding circuit 110 and reference voltage generating circuit 50 supply line voltage V
DD, V
SSJust enough.
At this moment, data image signal with ' H (height) ' in drain signal line 61 is input under the situation of holding circuit 110, by inverter circuit 111, in signal selecting circuit 120, because to 1TFT121 input ' L ', institute is so that the 1TFT121 conducting is imported ' H ' because 2TFT122 is passed through inverter circuit 112, so the 2TFT122 conducting.
So, select signal B, liquid crystal is applied the voltage of signal B.By show electrode 80 being applied the signal anti-phase, because liquid crystal is by electric field and upright, so can be observed black display as demonstration on the display panel of NW with opposite electrode 32.
Data image signal with ' L ' in drain signal line 61 is input under the situation of holding circuit 110, in signal selecting circuit 120 because to 1TFT121 input ' H ', so the 1TFT121 conducting, because to 2TFT122 input ' L ', so the 2TFT122 conducting.So, select signal A, liquid crystal is applied the voltage of signal A.That is,, do not produce electric field, thereby liquid crystal is not upright because show electrode 80 is applied the voltage identical with opposite electrode 32, thus on the display panel of NW as showing that can observe white shows.
Like this,, can show rest image by writing 1 picture amount, keeping this picture, but in this case, owing to stop the driving of each driver 50,60 and LSI91, so can realize this part low consumpting power.In addition owing to do not need to supply with signal A, signal B from the outside, so that the work of external circuit stops fully, can realize low consumpting power.
Fig. 5 represents the circuit structure diagram of the liquid crystal indicator of the present invention the 2nd embodiment.In the present embodiment, come inversion signal A (=opposite electrode signal V by phase inverter 300
COM), B synthesizes to signal.Thus, cut down the wiring of signal B in the display panel 100, can realize the highly integrated of display pixel 200.
Specifically, can be two kinds of constructive methods.A constructive method is to supply with signal A from tyre circuit substrate 90, carries out anti-phase by the phase inverter 300 that is provided with on the insulativity substrate 10 in the display panel 100 to this signal A.
Another constructive method is provided with the reference voltage generating circuit 500 that produces signal A as shown in Figure 5 on the insulated substrate 10 in display panel 100.Thus, same with the 1st embodiment, the supply power V only from the outside
DD, V
CCJust can, do not need to supply with signal A, signal B.For phase inverter 300 consumed powers are low, be preferably formed as CMOS type phase inverter.Here, the structure of reference voltage generating circuit 500 as described above.
Fig. 6 represents the circuit structure diagram of the liquid crystal indicator of the present invention the 3rd embodiment.In above-mentioned the 1st, the 2nd embodiment, signal selecting circuit 120 is made of 2 N channel-type TFT121,122, and in the future the output signal of the complementation of self-hold circuit 110 is applied to respectively on TFT121,122 the grid.That is, signal selecting circuit 120 is made of the transmission gate (transmission gate) of single channel-type (singlechannel type).
In the present embodiment, has the feature that constitutes signal selecting circuit 120 with cmos type transmission gate.Constitute at transmission gate under the situation of signal selecting circuit 120 by single channel-type, if do not improve the high level output of holding circuit 110, the sufficient electric current that then do not flow among the TFT121,122, the level of signal A, B by signal selecting circuit 120 can reduce the contrast deterioration of liquid crystal display.
But, owing to need to improve the supply voltage V of holding circuit 110
DDCould improve the high level output of holding circuit 110, so consumed power increases.
Here, as shown in Figure 6, by constituting signal selecting circuit 120, thereby problem is solved with cmos type transmission gate 123,124 (complementary type TFT).That is,, do not cause the decline of signal A and signal B, the high level output of holding circuit 110 can be suppressed at the current potential identical with the maximal value of signal A, B according to present embodiment.Thus, do not make the contrast deterioration of liquid crystal display, can realize low consumpting power.
According to above-mentioned same reason, circuit selects the TFT45 of circuit 43 preferably also to be made of CMOS type transmission gate (complementary type TFT).
In the present embodiment, signal A and signal B adopt the structure that is formed by reference voltage generating circuit 500, but same with the 2nd embodiment, also can be by forming signal B by phase inverter 300 inversion signal A.
Display device of the present invention is particularly suitable for reflection-type liquid-crystal display device in liquid crystal indicator.Therefore, the activation configuration of this reflection-type liquid-crystal display device is described with reference to Fig. 7.
As shown in Figure 7, on an insulativity substrate 10, on the semiconductor layer 11 of the islandization that constitutes by polysilicon, form gate insulating film 12, on the gate insulating film above the semiconductor layer 11 12, form gate electrode 13.
On the semiconductor layer 11 of the lower floor that is positioned at gate electrode 13 both sides, form source electrode 11s and drain electrode 11d.On gate electrode 13 and gate insulating film 12, pile up interlayer dielectric 14, on the position of the position of this drain electrode 11d correspondence and source electrode 11s correspondence, form contact hole 15,18, by this contact hole 15, drain electrode 11d is connected with drain electrode 16, and source electrode 11s also is connected with show electrode 19 by the contact hole 18 that is provided with on the smooth dielectric film 17 that is provided with on the interlayer dielectric 14.
Each show electrode 19 that forms on the planarization insulating film 17 is made of aluminium reflecting materials such as (Al).The alignment films 20 that on each show electrode 19 and planarization insulating film 17, constitutes by polyimide that liquid crystal is orientated etc.
On another insulativity substrate 30, form red by presenting (R), green (G), blue (B) chromatic filter 31, the opposite electrode 32 that TIO transparent and electrically conductive films such as (tin indium oxides) is formed and alignment films 33 that liquid crystal 21 is orientated of all kinds successively.Do not carrying out not needing chromatic filter 31 under the colored situation about showing.
The periphery of a pair of insulativity substrate 10,30 that forms is like this bondd by the cementability encapsulant, and filling liquid crystal 21 in the space that forms is like this finished reflection-type liquid-crystal display device.
Shown in dotted arrow among the figure,, reflect from opposite electrode substrate 30 incident successively from the exterior light of observer's 1 side incident by show electrode 19, inject to observer's 1 side, observer 1 can observe demonstration.
Like this, reflection-type liquid-crystal display device is the reflection exterior light mode of observing demonstration since do not need as transmission type liquid crystal display device, on the side opposite, to use with the observer so-called backlight, so do not need to make the power of this igniting backlight.Therefore, as display device of the present invention, preferably do not need backlight, be suitable for the low reflection-type liquid-crystal display device of consumed power.
In addition, in the above-described embodiments, in digital display mode, the situation of the digital data signal of importing 1 has been described, but the present invention is not limited to this, also goes for the situation of long number data-signal.Thus, can carry out the demonstration of masstone.At this moment, need with the holding circuit and the signal selecting circuit of the corresponding number of figure place of input.
In the above-described embodiments, illustrated rest image is presented at situation on the part of liquid crystal display panel, but the application is not limited to this, also still frame can be presented on all display pixels, has the distinctive effect of the present invention.
In above embodiment, the situation of reflection-type liquid-crystal display device has been described, even but transmissive display device also can fully similarly implement.Under the situation of infiltration type, in 1 pixel,, can intactly keep transmitance by on the zone except TFT, holding circuit, signal selecting circuit and signal routing, disposing transparency electrode, reduce stray capacitance.Even under the situation of using transmission type liquid crystal display device, after having shown 1 picture, supply with by stopping that gate drivers 50, drain driver 60 and screen board are in addition driven the voltage of using LSI91, can reduce the consumed power of this part.
As described above, according to display device of the present invention, because when digital display mode,, form the signal that display pixel is applied, so do not need to supply with these signals from the outside by the reference voltage generating circuit that is provided with in the display panel.Thus, can simplify the structure of external circuit, and when digital display mode, external circuit be quit work fully, can realize low consumpting power.
In addition, be arranged in the display panel, can cut down the space that inversion signal is connected up, realize highly integrated by carrying out anti-phase phase inverter to the signal that display pixel applies.
And, by constitute the signal selecting circuit of signal being supplied with selectively pixel electrode with complementary transistor,, make the consumed power of this part low so can reduce the supply voltage of holding circuit.
Claims (13)
1. display device, comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of disposing of the described signal line direction of intersecting and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, it is characterized in that
Be supplied to high voltage and low-voltage, according to the signal from the input of described signal line keep from the holding circuit of the data image signal of described drain signal line and
Supply with the corresponding configuration of signal selecting circuit of described pixel electrode according to select the 1st voltage and the 2nd voltage from the signal of described holding circuit with described pixel electrode;
With output the described the 1st or/and the reference voltage generating circuit of the 2nd voltage be configured on the described substrate.
2. display device as claimed in claim 1 is characterized in that, described the 1st voltage and described the 2nd voltage are the voltage between described low-voltage and the described high voltage.
3. display device as claimed in claim 1 is characterized in that, described the 1st voltage and described the 2nd voltage are the mutual anti-phase wavy voltage of rectangle.
4. display device as claimed in claim 3 is characterized in that, described reference voltage generating circuit is exported described the 1st voltage, and configuration is carried out described the 1st voltage anti-phase and exported the phase inverter of the 2nd voltage on described substrate.
5. display device, comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of disposing of the described signal line direction of intersecting and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, it is characterized in that, comprising:
Holding circuit is supplied to high voltage and low-voltage, keeps data image signal from described drain signal line according to the signal from the input of described signal line; And
Signal selecting circuit is according to selecting the 1st voltage and the 2nd voltage from the signal of this holding circuit and supplying with described pixel electrode;
Described the 2nd voltage is formed described the 1st voltage inversion by the phase inverter that forms on the described substrate.
6. display device as claimed in claim 5 is characterized in that, described the 1st voltage and described the 2nd voltage are the voltage between described low-voltage and the described high voltage.
7. display device as claimed in claim 5 is characterized in that, described the 1st voltage and described the 2nd voltage are the mutual anti-phase wavy voltage of rectangle.
8. as display device as described in the claim 5, it is characterized in that described the 1st voltage is produced by reference voltage generating circuit that form on the described substrate, by described high voltage and described low voltage drive.
9. display device, comprise a plurality of signal lines along the configuration of direction on the substrate, along and a plurality of drain signal line of disposing of the described signal line direction of intersecting and with the active matrix type display of the pixel electrode of the corresponding configuration of intersection point of described signal line and described drain signal line in, it is characterized in that, comprising:
Holding circuit is supplied to high voltage and low-voltage, keeps picture signal from described drain signal line according to the signal from the input of described signal line; And
Signal selecting circuit is according to selecting the 1st voltage and the 2nd voltage from the signal of this holding circuit and supplying with described pixel electrode;
Described signal selecting circuit is by the 1st complementary transistor of selecting described the 1st voltage and select the 2nd complementary transistor of described the 2nd voltage to form.
10. display device as claimed in claim 9 is characterized in that, described the 1st voltage is formed by described high voltage, and described the 2nd voltage is formed by described low-voltage.
11. display device as claimed in claim 9 is characterized in that, described the 1st voltage and described the 2nd voltage are the voltage between described low-voltage and the described high voltage.
12. display device as claimed in claim 9 is characterized in that, described the 1st voltage and described the 2nd voltage are the mutual anti-phase wavy voltage of rectangle.
13., it is characterized in that described the 2nd voltage carries out anti-phase formation by the inverter circuit that forms on the described substrate with described the 1st voltage as display device as described in the claim 12.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000282170 | 2000-09-18 | ||
| JP282170/00 | 2000-09-18 | ||
| JP282170/2000 | 2000-09-18 | ||
| JP243092/01 | 2001-08-10 | ||
| JP243092/2001 | 2001-08-10 | ||
| JP2001243092A JP4963761B2 (en) | 2000-09-18 | 2001-08-10 | Display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1344959A true CN1344959A (en) | 2002-04-17 |
| CN1208751C CN1208751C (en) | 2005-06-29 |
Family
ID=26600136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011331771A Expired - Fee Related CN1208751C (en) | 2000-09-18 | 2001-09-18 | Display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4963761B2 (en) |
| KR (1) | KR100469193B1 (en) |
| CN (1) | CN1208751C (en) |
| TW (1) | TW571153B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112863415A (en) * | 2019-11-28 | 2021-05-28 | 京东方科技集团股份有限公司 | Pixel driving circuit and display device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100481213B1 (en) * | 2001-12-28 | 2005-04-08 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display device and method of driving the same |
| JP7274955B2 (en) * | 2019-06-21 | 2023-05-17 | 株式会社ジャパンディスプレイ | liquid crystal display |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5653487A (en) * | 1979-10-05 | 1981-05-13 | Seiko Epson Corp | Liquid-crystal indication device for clock |
| JPS5823091A (en) * | 1981-08-04 | 1983-02-10 | セイコーインスツルメンツ株式会社 | Picture display unit |
| JPH0618845A (en) * | 1992-07-03 | 1994-01-28 | Casio Comput Co Ltd | Liquid crystal display device and apparatus using the same |
| JPH07181927A (en) * | 1993-12-24 | 1995-07-21 | Sharp Corp | Image display device |
| JPH08194205A (en) * | 1995-01-18 | 1996-07-30 | Toshiba Corp | Active matrix type display device |
| JP3630489B2 (en) * | 1995-02-16 | 2005-03-16 | 株式会社東芝 | Liquid crystal display |
| JP3319561B2 (en) * | 1996-03-01 | 2002-09-03 | 株式会社東芝 | Liquid crystal display |
| JPH09243996A (en) * | 1996-03-11 | 1997-09-19 | Matsushita Electric Ind Co Ltd | Liquid crystal display device, liquid crystal display system and computer system |
| JPH1039842A (en) * | 1996-07-23 | 1998-02-13 | Casio Comput Co Ltd | Terminal having liquid crystal display device |
| KR19980060007A (en) * | 1996-12-31 | 1998-10-07 | 김광호 | Power consumption reduction circuit of liquid crystal display |
-
2001
- 2001-08-10 JP JP2001243092A patent/JP4963761B2/en not_active Expired - Lifetime
- 2001-09-12 TW TW090122540A patent/TW571153B/en not_active IP Right Cessation
- 2001-09-18 KR KR10-2001-0057511A patent/KR100469193B1/en not_active IP Right Cessation
- 2001-09-18 CN CNB011331771A patent/CN1208751C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112863415A (en) * | 2019-11-28 | 2021-05-28 | 京东方科技集团股份有限公司 | Pixel driving circuit and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1208751C (en) | 2005-06-29 |
| KR20020022038A (en) | 2002-03-23 |
| KR100469193B1 (en) | 2005-02-02 |
| JP4963761B2 (en) | 2012-06-27 |
| JP2002162949A (en) | 2002-06-07 |
| TW571153B (en) | 2004-01-11 |
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