CN1517768A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN1517768A CN1517768A CNA031451462A CN03145146A CN1517768A CN 1517768 A CN1517768 A CN 1517768A CN A031451462 A CNA031451462 A CN A031451462A CN 03145146 A CN03145146 A CN 03145146A CN 1517768 A CN1517768 A CN 1517768A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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Abstract
Provided is a liquid crystal display having low power consumption and a simple structure and capable of obtaining a satisfactory image. The color liquid crystal display is provided with a temperature detection circuit 16 setting a signal [phi]T to a (L) level when the temperature of a liquid crystal panel 1 is higher than a prescribed temperature (e.g. 0[deg.]C) and setting the signal [phi]T to a (H) level when the temperature of the liquid crystal panel 1 is lower than the prescribed temperature and pre-charge control circuit 17 which does not perform pre-charge of a data line 6 when the signal [phi]T is set to the (L) level and performs pre-charge of the data line 6 by controlling switches S2 and S3 when the signal [phi]T is set to the (H) level. Since the pre-charge of the data line 6 is performed only when the temperature of the display panel 1 is low, reduction of power consumption, simplification of constitution and enhancement of image quality can be attained.
Description
Technical field
The present invention relates to liquid crystal indicator, be specifically related to a kind of liquid crystal indicator that carries out the image demonstration according to picture signal.
Background technology
In traditional color liquid crystal display arrangement, the deterioration of image quality when preventing low temperature, when low temperature, select many sweep traces successively by per two ground, under according to the original gray shade scale current potential of picture signal to before the liquid crystal cells charging, under gray shade scale current potential, to this liquid crystal cells precharge (for example the spy opens flat 10-186326 communique) corresponding to the liquid crystal cells of the same color assortment more than the front delegation of this liquid crystal cells.
But in traditional color liquid crystal display arrangement,, therefore there is the problem that power consumption increases, structure complicates because many sweep traces are selected on per two ground successively when low temperature.
Summary of the invention
Fundamental purpose of the present invention is to provide the liquid crystal indicator that a kind of power consumption is little, simple in structure, can obtain good image.
Liquid crystal indicator of the present invention is a kind of liquid crystal indicator that carries out the image demonstration according to picture signal, and it comprises liquid crystal display, temperature sensing circuit, vertical scanning circuit and level sweep circuit.Contain in the liquid crystal display: become a plurality of liquid crystal cells that multirow and multiple row dispose, that one electrode all receives common potential, many sweep traces that correspond respectively to multirow and be provided with, the many data lines that correspond respectively to multiple row and be provided with, and correspond respectively between another electrode that a plurality of liquid crystal cells were provided with, were connected separately corresponding data line and corresponding liquid crystal cells and each grid is connected to a plurality of transistors of corresponding scanning line.Temperature sensing circuit detects liquid crystal display or the temperature around it.Per schedule time of vertical scanning circuit is selected many sweep traces successively, applies the selection current potential on selected sweep trace, makes each transistor turns corresponding to this sweep trace.Sweep trace of the every selection of vertical scanning circuit, horizontal scanning circuit will be added in corresponding to the current potential of picture signal on another electrode corresponding to each liquid crystal cells of selected sweep trace by each data line with corresponding to each transistor of selected sweep trace.Contain in this horizontal scanning circuit: corresponding to each data line be provided with, select a sweep trace each during in precharge phase between pre-charge circuit that be activated, that when the detected temperatures of temperature sensing circuit is lower than predetermined temperature, corresponding data line is made as precharge potential, and corresponding to each data line is provided with, is activated corresponding data line is made as amplifying circuit after passing through between precharge phase corresponding to the current potential of picture signal.
Description of drawings
Fig. 1 is the block diagram of the color liquid crystal display arrangement total of the expression embodiment of the invention 1.
Fig. 2 is the circuit diagram of expression corresponding to the liquid crystal display drive circuit structure of each liquid crystal cells setting shown in Figure 1.
Fig. 3 is the sequential chart that is used to illustrate the precharge action of color liquid crystal display arrangement shown in Figure 1.
Fig. 4 is another sequential chart that is used to illustrate the precharge action of color liquid crystal display arrangement shown in Figure 1.
Fig. 5 is a circuit block diagram of representing the structure of the part related with the precharge action of color liquid crystal display arrangement shown in Figure 1.
Fig. 6 is the circuit diagram of the structure of expression temperature sensing circuit shown in Figure 5.
Fig. 7 is the circuit block diagram of expression precharge control circuit structure shown in Figure 5.
Fig. 8 is the sequential chart of the action of the expression part related with the precharge action shown in Fig. 5～7.
Fig. 9 is the diagrammatic sketch of explanation embodiment 1 effect.
Figure 10 is the circuit diagram of structure of temperature sensing circuit of the color liquid crystal display arrangement of the expression embodiment of the invention 2.
Figure 11 is the circuit block diagram of structure of the precharge control circuit of expression color liquid crystal display arrangement illustrated in fig. 10.
Figure 12 is the sequential chart of the precharge action of expression Figure 10 and color liquid crystal display arrangement illustrated in fig. 11.
Figure 13 is the circuit diagram of structure of temperature sensing circuit of the color liquid crystal display arrangement of the expression embodiment of the invention 3.
Figure 14 is the circuit block diagram of structure of the precharge control circuit of expression color liquid crystal display arrangement illustrated in fig. 13.
Figure 15 is the sequential chart of the precharge action of expression Figure 13 and color liquid crystal display arrangement illustrated in fig. 14.
Symbol description
1 liquid crystal display; 2 liquid crystal cells; 3 pixels; 4 sweep traces; 5 common potential lines; 6 data lines; 7 vertical scanning circuit; 8 horizontal scanning circuits; 10 liquid crystal display drive circuits; 12,63,74 electric capacity; 15 amplifiers; 16,40,60 temperature sensing circuits; 17,50,70 precharge control circuits; S1～S3 switch; 20～22,41～43,73 resistive elements; 23,61,62 P type TFT; 24,64 N type TFT; 25,44,45 comparers; 30 source electrode driver control circuits; 31,51,52 precharge timing generative circuit; The 32VCOM generative circuit; 33～35,47,53,54,72 ＂ and ＂ door; 36,46,65,71 phase inverters; 55 ＂ or ＂ door.
Embodiment
[embodiment 1]
Fig. 1 is the block diagram of the color liquid crystal display arrangement structure of the expression embodiment of the invention 1.Color liquid crystal display arrangement for example is contained on the personal handyphone among Fig. 1, and it comprises liquid crystal display 1, vertical scanning circuit 7 and horizontal scanning circuit 8.
Liquid crystal display 1 include into the configuration of multirow and multiple row liquid crystal cells 2, correspond respectively to multirow and the many sweep traces 4 that are provided with, correspond respectively to multirow and many common potential lines 5 being provided with and correspond respectively to multiple row and many data lines 6 of being provided with.Many common potential lines 5 interconnect.
As shown in Figure 2, on each liquid crystal cells 2, be provided with liquid crystal display drive circuit 10.Liquid crystal display drive circuit 10 comprises N type TFT (thin film transistor (TFT)) 11 and electric capacity 12.N type TFT11 is connected between the electrode 2a of data line 6 and liquid crystal cells 2, and its grid is connected on the sweep trace 4.The electrode 2a that electric capacity 12 is connected liquid crystal cells 2 uses between the equipotential line 5 together.Another electrode of liquid crystal cells 2 is connected on the common potential line 5.On common potential line 5, be added with common potential VCOM.
Return Fig. 1, vertical scanning circuit 7 is selected many sweep traces 4 successively according to per schedule time of picture signal, and selecteed sweep trace 4 is made as to select level be the H level.In a single day sweep trace 4 is made as and selects level is the H level, and the N type TFT11 among Fig. 2 is with regard to conducting, is connected with data line 6 corresponding to this liquid crystal cells 2 corresponding to electrode 2a of each liquid crystal cells 2 of this sweep trace 4.
If all liquid crystal cells 2 by vertical scanning circuit 7 and horizontal scanning circuit 8 scanning liquid crystal displays 1 then show piece image on liquid crystal display 1.
Below, the driving method as the data line 6 of feature of the present invention is described.Fig. 3 (a) and (b) be expression liquid crystal cells 2 an electrode 2a current potential VG ' and be applied to the figure of the common potential VCOM on another electrode of liquid crystal cells 2.In this color liquid crystal display arrangement, adopt normal white mode, being the absolute value of voltage between the electrode of liquid crystal cells 2 | VG '-when VCOM| equals 0V is for white shows, the absolute value of voltage between the electrode of liquid crystal cells 2 | when VG '-VCOM| equals supply voltage VCC black display.In order to realize the long lifetime of liquid crystal cells 2, sweep trace 4 of the every selection of the polarity of voltage VG '-VCOM just is transformed to positive polarity or negative polarity between the electrode of liquid crystal cells 2.And realize low power consumption for the amplitude that reduces grayscale voltage VG, sweep trace 4 of the every selection of common potential VCOM is earthing potential GND or power supply potential VCC with regard to checker.
During normal temperature, an electrode 2a of liquid crystal cells 2 is sufficiently charged/discharges under gray shade scale current potential VG.But shown in Fig. 3 (b), because the characteristic of liquid crystal, liquid crystal cells 2 electrode 2a charge/discharge fully under gray shade scale current potential VG when low temperature, deterioration appears in image quality.Can consider to increase the current driving ability of the amplifier that is used for driving data lines 6 as countermeasure, but since this amplifier fully by the number setting identical with data line 6, if therefore increase the current driving ability of amplifier, then power consumption will increase.
Therefore, shown in Fig. 4 (a), can consider after in a single day an electrode 2a of liquid crystal cells 2 is pre-charged to current potential corresponding to black level, the method for electrode 2a charge/discharge under gray shade scale current potential VG of liquid crystal cells 2.But when not needing precharge normal temperature, carrying out precharge is the waste power consumption.Therefore shown in Fig. 4 (b), in embodiment 1,, only when low temperature, carry out precharge by not carrying out precharge when the normal temperature, can realize the reduction of power consumption and the improvement of image quality.
Below, be described in more detail the driving method of this data line 6.Fig. 5 is the circuit block diagram of the expression part related with the driving of the data line 6 of this color liquid crystal display arrangement.As shown in Figure 5, comprise in this color liquid crystal display arrangement: the amplifier 15 and the switch S 1～S3 that are provided with corresponding to each data line 6, be arranged on the temperature sensing circuit 16 on the precalculated position of liquid crystal display 1, and be co-located on the precharge control circuit 17 on all of data lines 6.Amplifier 15, switch S 1～S3 and precharge control circuit 17 are included in the horizontal scanning circuit 8.
Temperature sensing circuit 16 detects the temperature of liquid crystal display 1, when detected temperature is higher than predetermined temperature (for example 0 ℃), signal psi T is made as the L level, when detected temperature is lower than predetermined temperature, signal psi T is made as the H level.That is to say, as shown in Figure 6, comprise in the temperature sensing circuit 16: the resistive element 20～22 that on the precalculated position of liquid crystal display 1, forms, P type TFT23, N type TFT24 and comparer 25.
Because each TFT23,24 threshold voltage vt h descend with temperature and rise, so the current potential of node N20 descends with temperature and rises.Therefore, be set at suitable value, when temperature is higher than predetermined temperature, signal psi T can be made as the L level, when temperature is lower than predetermined temperature, signal psi T can be made as the H level by resistance value with resistive element 21,22.
As shown in Figure 7, comprise in the precharge control circuit 17: source electrode driver control circuit 30, precharge is generative circuit 31, VCOM generative circuit 32, AND gate 33～35 and phase inverter 36 regularly.Source electrode driver control circuit 30, precharge regularly each circuit such as generative circuit 31, VCOM generative circuit 32 all with control signal HD synchronization action.As shown in Figure 8, control signal HD only becomes the L level in the T1 at the fixed time by predetermined period.The many sweep traces 4 of liquid crystal display 1 are made as the H level with the cycle identical with control signal HD successively by root ground.
Source electrode driver control circuit 30 response signal HD are pulled down to the L level from the H level, with signal psi 1 only at the fixed time T2 (＞be made as the L level in T1).Switch S 1 not conducting during signal psi 1 is in the L level, and the output node of amplifier 15 and data line 6 disconnect on electric.
Precharge regularly generative circuit 31 response signal HD move the H level to from the L level, with signal PR only at the fixed time T3 (＜be made as the H level in T2-T1).Whenever signal HD moves the H level to from the L level, VCOM generative circuit 32 makes the level inversion of common potential VCOM.The level of common potential VCOM is earthing potential GND, and another level is power supply potential VCC.
AND gate 33 receives the output potential φ T of temperature sensing circuit 16 and the output signal PR of precharge timing generative circuit 31, and its output signal φ 33 is input to an input node of AND gate 34,35.The common potential VCOM that VCOM generative circuit 32 produces is directly inputted in another input node of common potential line 5 and AND gate 34, is input in another input node of AND gate 35 by phase inverter 36 simultaneously.The output signal of AND gate 34,35 becomes control signal φ 3, the φ 2 of switch S 3, S2 respectively.Signal psi 2 be in the H level during, switch S 2 conductings, data line 6 is precharged to power supply potential VCC.Signal psi 3 be in the H level during, switch S 3 conductings, data line 6 is precharged to earthing potential GND.
The following describes the action of the circuit part of Fig. 5～shown in Figure 8.When the temperature of liquid crystal display 1 is during greater than 0 ℃ normal temperature, the value of TFT23 among Fig. 6, each threshold voltage vt h of 24 is lower, and the current potential of node N20 is lower than the current potential of node N21, and the output signal φ T of comparer 25 becomes the L level.Therefore, the output signal φ 33 of AND gate 33,34,35, φ 3, φ 2 are fixed on the L level among Fig. 7, and switch S 2, S3 are fixed on nonconducting state among Fig. 5, do not carry out the precharge of data line 6.Be made as the H level as signal psi 1, then switch S 1 conducting, data line 6 is located at gray shade scale current potential VG by amplifier 15.
And when the temperature of liquid crystal display 1 is when being lower than 0 ℃ low temperature, TFT23 among Fig. 6, each threshold voltage vt h of 24 become higher value, and the current potential of node N20 is higher than the current potential of node N21, and the output signal φ T of comparer 25 becomes the H level.Thus, the output signal PR of precharge timing generative circuit 31 becomes signal psi 33 by AND gate 33.When common potential VCOM was in the L level, signal psi 33 became signal psi 2 by AND gate 35, and data line 6 is precharged to the H level.When common potential VCOM was in the H level, signal psi 33 became signal psi 3 by AND gate 34, and data line 6 is precharged to the L level.If signal psi 1 is located at the H level, then switch S 1 conducting, data line 6 is located at gray shade scale current potential VG by amplifier 15.
In present embodiment 1, adopt temperature sensing circuit 16 to detect the temperature of liquid crystal displays 1 and since only when the temperature of liquid crystal display 1 is lower than the low temperature of predetermined temperature (0 ℃) to data line 6 precharge, therefore compare with the situation of charging often, power consumption reduces.
And, control precharge with switch S 2, S3 according to the level of the output signal φ T of temperature sensing circuit 16, therefore compare with the conventional art that temperature according to liquid crystal display 1 changes the radical of the sweep trace of selecting simultaneously 4, can make designs simplification and reduce power consumption.
Fig. 9 is the expression temperature of liquid crystal display 1 and the white level of liquid crystal cells 2, the graph of a relation of the contrast between the black level.The temperature of liquid crystal display 1 is during greater than 0 ℃ normal temperature, no matter whether precharge, and contrast is constant.So when normal temperature,, power consumption is reduced by stopping precharge.
When the temperature of liquid crystal display 1 is during less than 0 ℃ low temperature, to compare with not precharge contrast, the contrast after the precharge is high by about 5.So, can suppress the image quality deterioration that descends and cause because of contrast by carrying out precharge when the low temperature.
In addition, though temperature sensing circuit 16 is arranged on the precalculated position of liquid crystal display 1 in embodiment 1, be not limited to this, temperature sensing circuit 16 also can be arranged on liquid crystal display 1 precalculated position on every side.
[embodiment 2]
Figure 10 is the circuit diagram of structure of temperature sensing circuit 40 of the color liquid crystal display arrangement of the expression embodiment of the invention 2, and Figure 11 is the circuit block diagram of structure of the precharge control circuit 50 of this color liquid crystal display arrangement of expression.
With reference to Figure 10, the difference of the temperature sensing circuit 16 among temperature sensing circuit 40 and Fig. 6 is: replaced resistive element 21,22 and comparer 25 with resistive element 41～43, comparer 44,45, phase inverter 46 and AND gate 47.Resistive element 41～43 is connected between power supply potential VCC line and the earthing potential GND line.
Comparer 44 compares the current potential of node N20 and the current potential of the node N41 between the resistive element 41,42, when the current potential of node N20 is lower than the current potential of node N41, signal psi T2 is located at the L level, and when the current potential of node N20 was higher than the current potential of node N41, signal psi T2 was located at the H level.
Comparer 45 compares the current potential of node N20 and the current potential of the node N42 between the resistive element 42,43, when the current potential of node N20 is lower than the current potential of node N42, the output signal of comparer 45 becomes the L level, when the current potential of node N20 was higher than the current potential of node N42, the output signal of comparer 45 became the H level.
The output signal φ T2 of comparer 44 is input to an input node of AND gate 47 via phase inverter 46.The output signal of comparer 45 is input to another input node of AND gate 47.The output signal of AND gate 47 becomes signal psi T1.
When the temperature of liquid crystal display 1 was normal temperature, because the value of TFT23, each threshold voltage vt h of 24 is lower, so the current potential of node N20 was lower than the current potential of node N41, N42, and signal psi T1, φ T2 become the L level.
If the temperature of liquid crystal display 1 descends, enter first low-temperature region (for example 0～-5 ℃), then TFT23, each threshold voltage vt h of 24 become higher value, the current potential of node N20 becomes the current potential between the current potential of the current potential of node N42 and node N41, and signal psi T1, φ T2 become H level and L level respectively.
If the temperature of liquid crystal display 1 descends again, enter second low-temperature region (for example≤-5 ℃), then the value of TFT23, each threshold voltage vt h of 24 is higher, and the current potential of node N20 is higher than the current potential of node N41, N42, and signal psi T1, φ T2 become L level and H level respectively.Signal psi T1, φ T2 are added on the precharge control circuit 50 of Figure 11.
With reference to Figure 11, precharge control circuit 50 is with the difference of the precharge control circuit 17 of Fig. 7: regularly generative circuit 51,52, AND gate 53,54 and OR-gate 55 have been replaced precharge regularly generative circuit 31 and AND gate 33 with precharge.As shown in figure 12, precharge regularly generative circuit 51 response signal HD move the H level to from the L level, with signal PR1 only at the fixed time T11 (＜be made as the H level in T2-T1).Precharge regularly generative circuit 52 response signal HD move the H level to from the L level, with signal PR2 only at the fixed time T12 (be made as the H level in T11＜T12＜T2-T1).
AND gate 53 receive precharge regularly generative circuits 51 output signal PR1 and from the signal psi T1 of temperature sensing circuit 40.AND gate 54 receive precharge regularly generative circuits 52 output signal PR2 and from the signal psi T2 of temperature sensing circuit 40.OR-gate 55 receives the output signal of AND gate 53,54, and the output signal of OR-gate 55 is imported into an input node of AND gate 34,35.
The following describes the precharge action of the color liquid crystal display arrangement of Figure 10～shown in Figure 12.When the temperature of liquid crystal display 1 is during greater than 0 ℃ normal temperature, the value of the TFT23 among Figure 10, each threshold voltage vt h of 24 becomes lower, and signal psi T1, φ T2 become the L level.Therefore output signal φ 3, the φ 2 of the AND gate 34,35 among Figure 11 are fixed on the L level, and the switch S 2 among Fig. 3, S3 are fixed on nonconducting state, do not carry out the precharge of data line 6.
When the temperature of liquid crystal display 1 was 0～-5 ℃, the value of the TFT23 among Figure 10, each threshold voltage vt h of 24 was higher, and signal psi T1, φ T2 become H level and L level respectively.Therefore the output signal of AND gate 54 is fixed on the L level, and the output signal PR1 of precharge timing generative circuit 51 is input to an input node of AND gate 34,35 by AND gate 53 and OR-gate 55.When common potential VCOM was in the L level, signal PR1 became signal psi 2 by AND gate 35, and switch S 2 is conducting in short period T11 only, and data line 6 is precharged to the H level.When common potential VCOM was in the H level, signal PR1 became signal psi 3 by AND gate 34, and switch S 3 is conducting in short period T11 only, and data line 6 is precharged to the L level.
When the temperature of liquid crystal display 1 was lower than-5 ℃, the value of TFT23 among Figure 10, each threshold voltage vt h of 24 became higher, and signal psi T1, φ T2 become L level and H level respectively.Thus, the output signal of AND gate 53 is fixed on the L level, and the output signal PR2 of precharge timing generative circuit 52 is imported into an input node of AND gate 34,35 by AND gate 54 and OR-gate 55.When common potential VCOM was in the L level, signal PR2 became signal psi 2 by AND gate 35, switch S 2 conducting in long period T12, and data line 6 is precharged to the H level.When common potential VCOM was in the H level, signal PR2 became signal psi 3 by AND gate 34, switch S 3 conducting in long period T12, and data line 6 is precharged to the L level.
In present embodiment 2, owing to switch by two stages according to different low temperature degree precharge time, therefore can reduce the waste of precharge power, power consumption is further reduced.
[embodiment 3]
Figure 13 is the circuit diagram of structure of temperature sensing circuit 60 of the color liquid crystal display arrangement of the expression embodiment of the invention 3, and Figure 14 is the circuit block diagram of structure of the precharge control circuit 70 of this color liquid crystal display arrangement of expression.
With reference to Figure 13, temperature sensing circuit 60 is with the difference of the temperature sensing circuit 16 of Fig. 6: increased P type TFT61,62, electric capacity 63, N type TFT64 and phase inverter 65.P type TFT61 is inserted between the electrode of power supply potential VCC line and resistive element 20, and P type TFT62 and electric capacity 63 are connected between power supply potential VCC line and the earthing potential GND line.P type TFT61,62 grid all are connected in the drain electrode of P type TFT61.P type TFT61 and 62 constitutes current mirror circuit.
N type TFT64 is connected between the node N62 and earthing potential GND line between P type TFT62 and the electric capacity 63.Signal HD is imported into the grid of N type TFT64 by phase inverter 65.Comparer 25 compares the current potential of node N21 and the current potential on the node N62, and when the current potential of node N21 was higher than the current potential of node N62, signal psi T was made as the H level, and when the current potential of node N21 was lower than the current potential of node N62, signal psi T became the L level.
Figure 15 is the sequential chart of the precharge action of expression color liquid crystal display arrangement.Here, the temperature T of liquid crystal display 1 will be reduced to temperature below 0 ℃ at leisure from the temperature more than 0 ℃.Signal HD with predetermined period at the fixed time T1 (＜be made as the L level in T2).Become the L level as signal HD one, then the interior signal psi 1 of T2 is set as the L level at the fixed time, and the output signal φ 72 of AND gate 72 is set as the L level.And during signal HD is in the L level, the N type TFT64 conducting among Figure 13, the current potential of node N62 restores and is 0V, and signal psi T is set as the H level.
If to the H level, then three of AND gate 72 input signal φ 1, φ T, HD become the H level to signal HD from the L electrical level rising, the output signal φ 72 of AND gate 72 from the L electrical level rising to the H level.If the output signal φ 72 of AND gate 72 rises to the H level, then electric capacity 74 is slowly charged by resistive element 73, and the current potential of node N73 slowly rises.
And after N type TFT64 became not conducting, the current potential of node N62 slowly rose.That is to say that because P type TFT61, resistive element 20, P type TFT23 and N type TFT24 series connection, P type TFT61 and 62 constitutes current mirror circuits, therefore, flow to P type TFT62 corresponding to the electric current of P type TFT23, each threshold voltage vt h of 24.The electric current that flows to P type TFT62 is to electric capacity 63 chargings, and the current potential of node N62 slowly rises.In a single day the current potential of node N62 surpasses the current potential of node N21, and then the output signal φ T of comparer 25 is pulled down to the L level from the H level, and the output signal φ 72 of AND gate 72 becomes the L level.Reduce with the temperature reduction owing to flow to the electric current of P type TFT62, so the pulse width of signal psi 72 becomes big with the temperature reduction.If the output signal φ 72 of AND gate 72 is made as the L level, then the electric charge of electric capacity 74 discharges by resistive element 73, and the current potential of node N73 slowly descends.
If the temperature T of liquid crystal display 1 descends, then the pulse width of signal psi 72 becomes big, and the peak value of node N73 current potential uprises.When the temperature T of liquid crystal display 1 was higher than predetermined temperature (for example 0 ℃), the peak value of node N73 current potential was lower than AND gate 34,35 threshold potential VTH separately, and the output signal φ 3 of AND gate 34,35, φ 2 have nothing to do with common potential VCOM and become the L level.If the temperature T of liquid crystal display 1 is lower than predetermined temperature, then the peak value of node N73 current potential is higher than AND gate 34,35 threshold potential VTH separately, when common potential VCOM is in the H level, the output signal φ 3 of AND gate 34 becomes the H level, when common potential VCOM was in the L level, the output signal φ 2 of AND gate 35 became the H level.
If the temperature T of liquid crystal display 1 descends, then TFT23,24 threshold voltage vt h separately rises, and flows to P type TFT61,62 current value reduces, and the current potential ascending velocity of node N62 slows down, the current potential of node N62 rises from 0V, reaches the time lengthening above node N21 current potential.Therefore, along with temperature T descends, the positive pulse width of signal psi 2, φ 3 broadens continuously, and precharge time is elongated continuously.
In present embodiment 3, owing to the decline along with liquid crystal display 1 temperature T, precharge time is elongated continuously, and therefore, more effectively precharge further reduces power consumption.
Should think that all aspects among the embodiment disclosed herein are example, do not constitute any limitation of the invention.Scope of the present invention is not limited to above explanation, but is stipulated by its claim scope, and all changes in all suitable with the claim meaning and scopes are contained in the present invention.
[effect of invention]
In sum, in liquid crystal indicator of the present invention, be provided with liquid crystal display, temperature detection Circuit, vertical scanning circuit and level scanning circuit. Comprise in the liquid crystal display: become multirow and many Row configurations, their electrode all receives a plurality of liquid crystal cells of common potential, respectively Many scan lines that arrange corresponding to multirow correspond respectively to multiple row and many radicals of arranging According to line, and correspond respectively to a plurality of liquid crystal cells and arrange, each is connected corresponding number According between another electrode of line and corresponding liquid crystal cells and grid separately be connected in correspondence A plurality of transistors of scan line. Temperature sensing circuit detects liquid crystal display or the temperature around it. Per scheduled time of vertical scanning circuit is selected many scan lines successively, at selected scan line On apply the selection current potential, make each transistor turns corresponding to this scan line. Vertical scanning Scan line of the every selection of circuit, horizontal scanning circuit are just by each data wire with corresponding to institute Each transistor of the scan line of selecting will be applied to corresponding to the current potential of picture signal corresponding to Another electrode of each liquid crystal cells of selected scan line. Wrap in this horizontal scanning circuit Contain: corresponding to each data wire arrange, selecteed in during each at scan line Be activated between precharge phase, be lower than predetermined temperature in the detected temperatures of temperature sensing circuit The time data wire of correspondence is made as the pre-charge circuit of precharge potential, and corresponding to each number According to line arrange, through be activated after between precharge phase, the data wire of correspondence is established Be the amplifying circuit corresponding to the current potential of picture signal. Therefore, since when low temperature to data Line precharge, image quality deterioration in the time of can suppressing low temperature. And, owing to when normal temperature, stop pre-Charging is so can reduce the waste of power consumption. In addition, even owing to when low temperature, also pursue root Many scan lines are selected on ground, select the conventional art of many scan lines to compare with per two ground, Can make that power consumption reduces, designs simplification.
Claims (5)
1. a liquid crystal indicator that carries out the image demonstration according to picture signal wherein is provided with liquid crystal display, temperature sensing circuit, vertical scanning circuit and horizontal scanning circuit;
Comprise in the described liquid crystal display: become the configuration of multirow and multiple row, their electrode all is connected to a plurality of liquid crystal cells of common potential, many sweep traces that correspond respectively to described multirow and be provided with, the many data lines that correspond respectively to described multiple row and be provided with, and correspond respectively between another electrode that described a plurality of liquid crystal cells was provided with, was connected separately corresponding data line and corresponding liquid crystal cells, grid separately is connected in a plurality of transistors of corresponding scanning line;
Described temperature sensing circuit detects described liquid crystal display or the temperature around it;
Described per schedule time of vertical scanning circuit is selected described many sweep traces successively, applies the selection current potential on selected sweep trace, makes each transistor turns corresponding to this sweep trace;
Sweep trace of the every selection of described vertical scanning circuit, described horizontal scanning circuit just will be applied to corresponding to the current potential of described picture signal on another electrode corresponding to each liquid crystal cells of selected sweep trace via each data line with corresponding to each transistor of selected sweep trace;
Comprise in the described horizontal scanning circuit,
Corresponding to each data line setting, select a described sweep trace each during in precharge phase between in pre-charge circuit that be activated, that when the detected temperatures of described temperature sensing circuit is lower than predetermined temperature, corresponding data line is located at precharge potential, and
Corresponding to each data line setting, through be activated after between described precharge phase, corresponding data line is located at amplifying circuit corresponding to the current potential of described picture signal.
2. liquid crystal indicator as claimed in claim 1 is characterized in that:
Comprise in the described temperature sensing circuit,
The potential generating circuit that its output potential changes according to the temperature around described liquid crystal display or its, and
The comparator circuit of exporting the precharge indicator signal with reference to current potential that surpasses according to the output potential of described potential generating circuit;
Described pre-charge circuit responds described precharge indicator signal and only within a certain period of time corresponding data line is located at described precharge potential between each precharge phase.
3. liquid crystal indicator as claimed in claim 1 is characterized in that:
Comprise in the described temperature sensing circuit,
The potential generating circuit that its output potential changes according to the temperature around described liquid crystal display or its, and
With the output potential of described potential generating circuit and different a plurality ofly compare with reference to current potential mutually, and the result exports the comparator circuit of any one the precharge indicator signal in a plurality of precharge indicator signals based on the comparison;
Described pre-charge circuit only is being located at described precharge potential with corresponding data line between each precharge phase in corresponding to the time from the precharge indicator signal of described comparator circuit,
The time that described data line is made as described precharge potential descends along with described liquid crystal display or the temperature around it and is extended by the piecewise.
4. liquid crystal indicator as claimed in claim 1 is characterized in that:
Comprise in the described temperature sensing circuit,
The potential generating circuit that its output potential changes according to the temperature around described liquid crystal display or its,
Output is corresponding to the signal generating circuit of the precharge indicator signal of the pulse width of the output potential of described potential generating circuit between each precharge phase, and
The gate circuit that receive the output signal of described signal generating circuit, only its pulse width is passed through greater than the precharge indicator signal of predetermined pulse width;
Described pre-charge circuit only is located at described precharge potential with corresponding data line in the time corresponding to the pulse width of the precharge indicator signal by described gate circuit,
The time that described data line is located at described precharge potential descends along with described liquid crystal display or the temperature around it and lengthening continuously.
5. as any one described liquid crystal indicator in the claim 2～4, it is characterized in that: comprise in the described potential generating circuit be arranged on the described liquid crystal display, its threshold voltage descends along with the temperature of described liquid crystal display and the thin film transistor (TFT) that rises.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8405/2003 | 2003-01-16 | ||
| JP8405/03 | 2003-01-16 | ||
| JP2003008405A JP4043371B2 (en) | 2003-01-16 | 2003-01-16 | Liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1517768A true CN1517768A (en) | 2004-08-04 |
| CN1328620C CN1328620C (en) | 2007-07-25 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031451462A Expired - Fee Related CN1328620C (en) | 2003-01-16 | 2003-06-20 | Liquid crystal display device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4043371B2 (en) |
| KR (1) | KR100522642B1 (en) |
| CN (1) | CN1328620C (en) |
| TW (1) | TW583638B (en) |
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| CN100451752C (en) * | 2005-07-11 | 2009-01-14 | 三菱电机株式会社 | Method for driving liquid crystal panel, and liquid crystal display device |
| CN102096257A (en) * | 2010-11-16 | 2011-06-15 | 华映视讯（吴江）有限公司 | Transistor array substrate |
| CN101281305B (en) * | 2007-04-04 | 2011-11-09 | 三星电子株式会社 | Liquid crystal display |
| CN102332241A (en) * | 2007-05-18 | 2012-01-25 | 三星电子株式会社 | The method of display apparatus and driving display equipment |
| CN103035200A (en) * | 2011-10-04 | 2013-04-10 | 乐金显示有限公司 | Organic light emitting display device and driving method thereof |
| CN105976772A (en) * | 2015-03-13 | 2016-09-28 | 辛纳普蒂克斯显像装置合同会社 | Device and method for driving liquid crystal display panel |
| US9483986B2 (en) | 2008-04-11 | 2016-11-01 | Beijing Boe Optoelectronics Technology Co., Ltd. | Method and a device for compensating response time of liquid crystal display |
| CN108847185A (en) * | 2018-06-26 | 2018-11-20 | 昆山国显光电有限公司 | scanning circuit and its driving method, display panel and display device |
| CN110517647A (en) * | 2019-08-30 | 2019-11-29 | 上海中航光电子有限公司 | The driving method and liquid crystal display device of liquid crystal display panel |
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| JP2012189765A (en) | 2011-03-10 | 2012-10-04 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
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| KR102605050B1 (en) | 2017-02-21 | 2023-11-23 | 삼성디스플레이 주식회사 | Driving Method For Display Device |
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| JP2794226B2 (en) * | 1991-04-15 | 1998-09-03 | キヤノン株式会社 | Driving device and driving method for ferroelectric liquid crystal device |
| JP2942092B2 (en) * | 1993-04-20 | 1999-08-30 | キヤノン株式会社 | Control method of liquid crystal element |
| JPH07253765A (en) * | 1994-03-15 | 1995-10-03 | Hitachi Ltd | Liquid crystal active matrix display device |
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2003
- 2003-01-16 JP JP2003008405A patent/JP4043371B2/en not_active Expired - Fee Related
- 2003-03-18 TW TW092105856A patent/TW583638B/en not_active IP Right Cessation
- 2003-06-20 KR KR10-2003-0040055A patent/KR100522642B1/en not_active IP Right Cessation
- 2003-06-20 CN CNB031451462A patent/CN1328620C/en not_active Expired - Fee Related
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| CN100451752C (en) * | 2005-07-11 | 2009-01-14 | 三菱电机株式会社 | Method for driving liquid crystal panel, and liquid crystal display device |
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| CN108847185A (en) * | 2018-06-26 | 2018-11-20 | 昆山国显光电有限公司 | scanning circuit and its driving method, display panel and display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW583638B (en) | 2004-04-11 |
| KR100522642B1 (en) | 2005-10-20 |
| JP2004219824A (en) | 2004-08-05 |
| JP4043371B2 (en) | 2008-02-06 |
| CN1328620C (en) | 2007-07-25 |
| KR20040065966A (en) | 2004-07-23 |
| TW200304116A (en) | 2003-09-16 |
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