CN100420990C - Display device and method of driving the same - Google Patents
Display device and method of driving the same Download PDFInfo
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- CN100420990C CN100420990C CNB200510066630XA CN200510066630A CN100420990C CN 100420990 C CN100420990 C CN 100420990C CN B200510066630X A CNB200510066630X A CN B200510066630XA CN 200510066630 A CN200510066630 A CN 200510066630A CN 100420990 C CN100420990 C CN 100420990C
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Abstract
In a display, a first liquid crystal panel has gate bus lines, source bus lines, TFTs, and pixel electrodes, as well as a source driver. A second liquid crystal panel has gate bus lines, source bus lines, TFTs, and pixel electrodes. The source bus lines of the second liquid crystal panel are connected to the associated source bus lines of the first liquid crystal panel through switching TFTs. The source bus lines of the second liquid crystal panel are briefly and repeatedly fed with a predetermined potential when the switching TFTs are off. The invention reduces power consumption of dual panel structure displays and prevents occurrence of an unintended display on the second display panel which is not expected to produce any display.
Description
Technical field
The present invention relates to comprise active array type a plurality of display screens liquid crystal indicator etc. display device with and driving method.
Background technology
In recent years, for example mancarried device, particularly clamshell phone, using what be made up of 2 display screens more is so-called Dual-band Handy Phone.Figure 18 represents the circuit diagram by main screen 582 and secondary screen 583 double screens of forming 581 as the one example.
In addition, main screen 582 is also wrapped Chinese juniper gate drivers 590 and source electrode driver 591.The extension line of gate drivers 590 links to each other with grid bus 588, and the extension line of source electrode driver 591 links to each other with source bus line 589.And 591 pairs of buses separately of gate drivers 590 and source electrode driver apply signal voltage and display data signal.
On the other hand, secondary screen 583 be included in TFT substrate 586 that thin film transistor (TFT) 592 is set on the substrate, and these TFT substrate 586 opposed counter substrate 587 and be clipped in TFT substrate 586 and counter substrate 587 between the liquid crystal layer as display medium (LC) 594.
This pair screen 583 links to each other with main screen 582 through not shown FPC (Flexible Printed Circuits flexible print circuit).Thus, from the gate drivers 590 and wiring and the FPC (Flexible Printed Circuits) of source electrode driver 591 in main screen 582 of main screen 582, each bar bus of pair screen 583 is applied signal voltage or display data signal.
The existing document that comprises the concrete device of double screen as announcement has following, for example Japan's publication communique (spy opens 2001-067049 (open day 03 month 16 days calendar year 2001) (the 1st prior art)), Japan's publication communique (spy opens 2001-282145 (open day October 12 calendar year 2001) (the 2nd prior art)) and Japan's publication communique (spy opens 2003-131250 (open day on 05 08th, 2003) (the 3rd prior art)).
In the 1st prior art, disclosed the Foldable mobile communication terminal machine that comprises the double screen of forming by the 1st liquid crystal display part (the 1st liquid crystal indicator) and the 2nd liquid crystal display part (the 2nd liquid crystal indicator).In this mobile communication terminal, with respect to main part energy switch case portion (folded form case), the 1st liquid crystal display part is arranged on the inside surface (being in the inside surface of folded state) of case portion, and the 2nd liquid crystal display part is arranged on the outside surface (being in the outside surface of folded state) of case.The the 1st and the 2nd liquid crystal display part is by a driver drives, and this driver is arranged on the 1st liquid crystal display part one side.That is, the output of driver is input to the 2nd liquid crystal display part through the 1st liquid crystal display part.The display area of the 2nd liquid crystal display part is less than the display area (with reference to Fig. 4, Fig. 5 of the 1st prior art patent communique) of the 1st liquid crystal display part, on the 2nd liquid crystal display part except the time, also show concise and to the point information, on the 1st liquid crystal display part, show multiple information.In addition, be under the closed condition, only show, be under the opening, only show by the 1st liquid crystal display part in case portion by the 2nd liquid crystal display part in case portion.
In the 2nd prior art, identical with the 1st prior art, disclosed the clamshell phone that comprises the double screen of forming by the 1st liquid crystal display part (inboard liquid crystal display part) and the 2nd liquid crystal display part (outside liquid crystal display part).This mobile phone is with respect to main part (lower case) energy switch case portion (upper body), the 1st liquid crystal display part is arranged on the inside surface (being in the inside surface of folded state) of case portion, and the 2nd liquid crystal display part is arranged on the outside surface (being in the outside surface of folded state) of case portion.The the 1st and the 2nd liquid crystal display part is by a driver drives, and this driver is arranged on the 1st liquid crystal display part one side.The output that is driver is input to the 2nd liquid crystal display part through the 1st liquid crystal display part.The display area of the 2nd liquid crystal display part is less than the display area (with reference to Fig. 3, Fig. 4 of the 2nd prior art patent communique) of the 1st liquid crystal display part.In addition, be under the closed condition, only show, be under the opening, only show by the 1st liquid crystal display part in case portion by the 2nd liquid crystal display part in case portion.
In the 3rd prior art, identical with the 1st prior art, disclosed the clamshell phone that comprises the double screen of forming by the 1st liquid crystal display part (LCD) and the 2nd liquid crystal display part (LCD).In this mobile phone, with respect to main part energy switch case portion (lid), the 1st liquid crystal display part is arranged on the inside surface (being in the inside surface of folded state) of case portion, and the 2nd liquid crystal display part is arranged on the outside surface (being in the outside surface of folded state) of case.The the 1st and the 2nd liquid crystal display part is by a driver drives, and this driver is arranged on the 1st liquid crystal display part one side.That is, the output of driver is input to the 2nd liquid crystal display part through the 1st liquid crystal display part.The display area of the 2nd liquid crystal display part is less than the display area (with reference to Fig. 1, Figure 10 of the 3rd prior art patent communique) of the 1st liquid crystal display part, on the 2nd liquid crystal display part, show the simple information of incoming call or date etc., on the 1st liquid crystal display part, show main information.
As mentioned above, the display device of being made up of double screen is used in the mancarried device of mobile phone etc. morely, requires low-power consumption.But, for the low-power consumption in the above-mentioned existing apparatus, do not take sufficient measure, be not enough.
Summary of the invention
The present invention puts forward in order to address the above problem, its purpose be to provide a kind of liquid crystal indicator that can realize sufficient low-power consumption with and driving method.
The display device of the present invention the 1st aspect comprises: the 1st display part, described the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near each cross-shaped portion of these the 1st signal lines and the 1st source signal line that dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line and through the 1st on-off element and the pixel electrode that described the 1st source signal line links to each other, the driving circuit of described many articles the 1st source signal lines being supplied with the source signal line of display data signal is set; The 3rd on-off element of forming by semiconductor element; The 2nd display part, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, that dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element near each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, each bar the 2nd source signal line links to each other through corresponding the 1st source signal line of the 3rd on-off element and the 1st display part, with the public described source signal line drive circuit of the 1st display part; And the constant potential supply circuit, described constant potential supply circuit the 3rd on-off element be in disconnect action during in, each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential.
The display device of the present invention the 2nd aspect comprises: the 1st display part, described the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near each cross-shaped portion of these the 1st signal lines and the 1st source signal line that dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line and through the 1st on-off element and the pixel electrode that described the 1st source signal line links to each other, the driving circuit of described many articles the 1st source signal lines being supplied with the source signal line of display data signal is set; The 3rd on-off element of forming by semiconductor element; The 2nd display part, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, that dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element near each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, each bar the 2nd source signal line links to each other through corresponding the 1st source signal line of the 3rd on-off element and the 1st display part, with the public described source signal line drive circuit of the 1st display part; And control part, described control part is controlled the action that is switched on or switched off of the 3rd on-off element, in simultaneously during making the 3rd on-off element be in the disconnection action, for each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential the 3rd on-off element is carried out the temporary transient ON Action of repetition temporary transient and the repetition ON Action, and in during this repeats temporary transient ON Action, make constant potential output to each bar the 1st source signal line of the 1st display part from the driving circuit of described source signal line.
In addition, the driving method of the display device of the present invention the 3rd aspect has following characteristics, above-mentioned display device comprises the 1st display part and the 2nd display part, wherein said the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line each cross-shaped portion of these the 1st signal lines and the 1st source signal line, and the pixel electrode that links to each other with described the 1st source signal line through the 1st on-off element, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, near dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element; In the driving method of described display device, the 3rd on-off element that each bar the 2nd source signal line of the 2nd display part is formed via semiconductor element links to each other with corresponding each bar the 1st source signal line of the 1st display part; The 1st source signal line through the 1st display part is supplied with display data signal to the 2nd source signal line of the 2nd display part; During the 3rd on-off element is in the disconnection action, each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential.
The driving method of the display device of the present invention the 4th aspect has following characteristics in addition, above-mentioned display device is comprising the 1st display part and the 2nd display part, wherein said the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line each cross-shaped portion of these the 1st signal lines and the 1st source signal line, and the pixel electrode that links to each other with described the 1st source signal line through the 1st on-off element, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, near dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element; In the driving method of described display device, the 3rd on-off element that each bar the 2nd source signal line of the 2nd display part is formed via semiconductor element links to each other with corresponding each bar the 1st source signal line of the 1st display part; The 1st source signal line through the 1st display part is supplied with display data signal to the 2nd source signal line of the 2nd display part; During the 3rd on-off element is in the disconnection action, for each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential the 3rd on-off element is carried out the temporary transient ON Action of repetition temporary transient and the repetition ON Action, and in during this repeats temporary transient ON Action, each bar the 1st source signal line of the 1st display part is supplied with constant potential.
According to said structure, carry out display action at the 1st display part, the 2nd display part stops under the situation of display action, the 2nd display part can with the 1st display part from.Load can be alleviated thus, power consumption can be reduced because of the continuous electricity that produces of the 2nd display part.
In addition, the 2nd display part and the 1st display part from during in, that is, the 2nd on-off element temporarily and is repeatedly supplied with constant potential for each bar source signal line of the 2nd display part in being in and disconnecting during the action.Thereby even the 2nd on-off element of being made up of semiconductor element is in off-state and produces leakage current, the current potential of each bar source signal line of the 2nd display part will gradually change, but also can remain on constant potential.Thus, in the 2nd display part that does not carry out display action, the potential difference (PD) of pixel electrode and opposite electrode is constant, can prevent to change the situation of carrying out undesired demonstration because of this potential difference (PD).
In addition, in during the 2nd on-off element is in the disconnection action, the 2nd on-off element is carried out under the situation of the temporary transient ON Action of repetition, owing to the leakage current of the 2nd on-off element makes the current potential of the source signal line of the 2nd display part converge on the average potential of the source signal line of the 1st display part that carries out display action.This average potential makes every source signal line that delicate difference be arranged because of the difference of the display image of the 1st display part sometimes, in this case, each pixel electrode of the 2nd display part and each potential difference (PD) of opposite electrode are inhomogeneous, and the display frame of the 2nd display part is in the state that looks very uncomfortable.Thereby, as mentioned above,, just can eliminate these problems as long as carrying out the temporary transient ON Action of repetition by each the bar source signal line for the 2nd display part supplies with above-mentioned constant potential.
Description of drawings
Fig. 1 represents the circuit diagram of the display device structure of one embodiment of the present invention.
The case portion that Fig. 2 (a) expression has the mobile phone of display device shown in Figure 1 closes the stereographic map that is in folded state.
Fig. 2 (b) represents that the case portion of this mobile phone is in the stereographic map of opening.
Fig. 3 represents the longitudinal sectional drawing of major part of the case portion of mobile phone shown in Figure 2.
Action timing diagram when Fig. 4 represents to make the 1st liquid crystal display of display device shown in Figure 1 to show.
Action timing diagram when Fig. 5 represents to make the 2nd liquid crystal display of display device shown in Figure 1 to show.
Fig. 6 represents the block scheme of display device structure shown in Figure 1.
Fig. 7 is illustrated in the display device shown in Figure 1 to be made under the situation that the 2nd liquid crystal display do not show in that the 1st liquid crystal display is shown, the sequential chart from the output signal of source electrode driver when not carrying out the temporary transient ON Action of the repetition of switch portion.
Fig. 8 is illustrated in the display device shown in Figure 1 to be made in that the 1st liquid crystal display is not shown under the situation that the 2nd liquid crystal display shows, from the sequential chart of the output signal of source electrode driver.
Fig. 9 is illustrated in the display device shown in Figure 1 to be made under the situation that the 2nd liquid crystal display do not show in that the 1st liquid crystal display is shown, the sequential chart from the output signal of source electrode driver when carrying out the temporary transient ON Action of the repetition of switch portion.
Figure 10 represents the front elevation of schematic configuration of the display device of other embodiment of the present invention.
Figure 11 represents the circuit diagram of display device structure shown in Figure 10.
Action timing diagram when Figure 12 represents to make the pair screen of display device shown in Figure 11 to show.
Action timing diagram when Figure 13 represents to make the main screen of display device shown in Figure 11 to show.
Figure 14 represents the circuit diagram of other example of switching TFT shown in Figure 11.
Figure 15 is illustrated in the display device shown in Figure 11 to be made under the situation that main screen do not show in that secondary screen is shown, the sequential chart from the output signal of source electrode driver when not carrying out the temporary transient ON Action of the repetition of switch portion.
Figure 16 is illustrated in the display device shown in Figure 11 to be made in that secondary screen is not shown under the situation that main screen shows, from the sequential chart of the output signal of source electrode driver.
Figure 17 is illustrated in the display device shown in Figure 11 to be made under the situation that main screen do not show in that secondary screen is shown, the sequential chart from the output signal of source electrode driver when carrying out the temporary transient ON Action of the repetition of switch portion.
Figure 18 represents the circuit diagram of the display device of existing double screen structure.
Embodiment
One embodiment of the present invention below is described with reference to the accompanying drawings.
Fig. 1 represents the circuit diagram of the liquid crystal indicator (display device) 1 of present embodiment.Liquid crystal indicator 1 is made of the double screen that comprises the 1st liquid crystal display (the 1st display unit) the 10 and the 2nd liquid crystal display (the 2nd display unit) 20 as shown in Figure 1.
The 1st liquid crystal display 10 comprise be provided with TFT (thin film transistor (TFT): Thin Film Transistor) 25 TFT substrate 11, and these TFT substrate 11 opposed counter substrate 12 and be clipped in TFT substrate 11 and counter substrate 12 between the liquid crystal layer as display medium.This liquid crystal layer constitutes liquid crystal capacitance 26.
Many grid buss (signal line) 14 and many source bus line (source signal line) 16 are set on TFT substrate 11.Near configuration TFT (the 1st switch element) 25 cross-shaped portion of this grid bus 14 and source bus line 16.The grid of TFT25 links to each other with grid bus 14, and source electrode links to each other with source bus line 16, and draining simultaneously links to each other with pixel electrode.And, between opposite electrode (COM) 27 that is provided with on the counter substrate 12 and pixel electrodes, the liquid crystal capacitance 26 that constitutes pixel is applied voltage.Move display image by in each TFT25, carrying out these.
The 2nd liquid crystal display 20 comprise the TFT substrate 21 that is provided with TFT25, and these TFT substrate 21 opposed counter substrate 22 and be clipped in TFT substrate 21 and counter substrate 22 between the liquid crystal layer as display medium.This liquid crystal layer constitutes liquid crystal capacitance 26.
Also have, in Fig. 1, to the numbering of source bus line 16, grid bus 14,24 additional-L ,-M ,-label of N etc. represents the wire size of each bar line, L, M, N represent the sum of each bar line.In the following description, be not the line during of will specify numbering as object, just additional-L ,-M ,-label of N etc. is described.
In the liquid crystal indicator 1 of present embodiment, the source bus line 16 of the 1st liquid crystal display 10 and the source bus line 16 of the 2nd liquid crystal display 20 are corresponding separately.That is, the source bus line 16 corresponding with grid bus 14 and with the corresponding source bus line 16 of grid bus 24 through switch portion 19 and have i.e. for example FPC (Flexible Printed Circuits) 30 conductings mutually of flexible connecting elements.Switch portion 19 is arranged on the 1st liquid crystal display 10, and FPC30 is arranged between the 1st liquid crystal display 10 and the 2nd liquid crystal display 20.Also have, the allocation position of switch portion 19 is not limited to the 1st liquid crystal display 10, also can be on the 2nd liquid crystal display 20 or between the 1st liquid crystal display 10 and the 2nd liquid crystal display 20.
In the 1st liquid crystal display 10 and the 2nd liquid crystal display 20, the gate drivers (scan signal line drive circuit) of driving grid bus 14,24 comprises separately special- purpose gate drivers 13,23, and the source electrode driver that drives source bus line 16 comprises the 1st liquid crystal display 10 and the public source electrode driver 15 of the 2nd liquid crystal display 20.To grid bus 14,24 output signals (grid selection signal), export display data signal to source bus line 16 from gate drivers output 13,23 from source electrode driver 15.Source electrode driver 15 is arranged on the 1st liquid crystal display 10 1 sides, supplies with display data signal through the 1st liquid crystal display 10 to the 2nd liquid crystal display 20.
Here, comprise under the situation of liquid crystal indicator 1 in a device that the 1st liquid crystal display 10 uses as the display screen of comparing (grow service time) that show that frequency is high with the 2nd liquid crystal display 20.For example, the 1st liquid crystal display 10 is in used device, display device as demonstration time, this device present situation or some brief information is used, and the 2nd liquid crystal display 20 uses as the display device that begins the more detailed information of display message (some details) display action, demonstration ratio the 1st liquid crystal display 10 according to for example operator's operation.
Specifically be exactly, for example shown in Fig. 2 (a) and (b), in clamshell phone 40 with respect to main part (the 1st housing section) 41 energy switch case portions (the 2nd housing section) 42, the 1st liquid crystal display 10 is arranged on the outside surface (outside surface when being in folded state) of case portion 42, and the 2nd liquid crystal display 20 is arranged on the inside surface (inside surface when being in folded state) of case portion 42.Fig. 3 represents the longitudinal sectional drawing of major part of the case portion 42 of this state.As shown in the drawing, the 1st liquid crystal display 10 and the 2nd liquid crystal display 20 are arranged in case portion 42 inside and lean against opposed privately state.
As mentioned above, in liquid crystal indicator 1, showing that high the 1st liquid crystal display 10 1 sides of frequency are provided with source electrode driver 15, drive two display screens (the 1st and the 2nd liquid crystal display 10,20) by a driving circuit (source electrode driver 15), and utilize switch portion 19 that two display screens (the 1st with the 2nd LCDs 10,20) are separated.
In above-mentioned mobile phone 40, when using mobile phone when utilizing phone to converse, when Email carries out transmit operation and when receiving mail and carry out content check etc., case portion 42 is in opening.In this case, the display action of the 1st liquid crystal display 10 is not worked, make the display action work of the 2nd liquid crystal display 20.On the other hand, be in case portion 42 and close under the waiting status (power connection state), make the display action work of the 1st liquid crystal display 10, the display action of the 2nd liquid crystal display 20 is not worked.In mobile phone 40 since the general time that for example case portion 42 is in closed condition in one day greater than the time that is in opening, therefore the demonstration frequency of the 1st liquid crystal display 10 is higher than the 2nd liquid crystal display 20.
In above-mentioned liquid crystal indicator 1, be under the closed condition in case portion 42, have only the display action of the 1st liquid crystal display 10 in running order, the display action of the 2nd liquid crystal display 20 is in off position.In this case, be used to make all switching TFT 17 of switch portion 19 be in off-state, do not supply with display data signal to the source bus line 16 of the 2nd liquid crystal display 20 from source electrode driver 15 from the switch controlling signal of source electrode driver 15.In addition, gate drivers 13 actions, and gate drivers 23 is failure to actuate.
Also have, carry out like that from the output of the switch controlling signal of source electrode driver 15 is for example following.The state of for example closing case portion 42 is detected by for example switch detector switch (not shown) as the switch detecting unit that is arranged in the mobile phone 40, this detection signal is input to control module (not shown), according to instruction, from source electrode driver 15 output switch control signals from this control module.
On the other hand, under the state of opening case portion 42, have only the display action of the 2nd liquid crystal display 20 in running order, the display action of the 1st liquid crystal display 10 is in off position.In this case, be used to switch controlling signal, make all switching TFT 17 of switch portion 19 be in on-state, supply with display data signal to the source bus line 16 of the 2nd liquid crystal display 20 from source electrode driver 15 from source electrode driver 15.In addition, gate drivers 13 stops action, and gate drivers 23 moves.
Then, illustrate in greater detail the display action of the above-mentioned the 1st and the 2nd liquid crystal display 10,20.
When the 1st liquid crystal display 10 shows, as shown in Figure 4, source bus line 16 is applied display data signal from source electrode driver 15, grid bus 14 is applied the signal that TFT25 uses that is switched on or switched off from gate drivers 13.At this moment, if the voltage of grid bus 14 is high level, then the TFT25 that is connected with this grid bus 14 is in on-state, and the display data signal that source bus line 16 is applied writes pixel (liquid crystal capacitance 26).
In the display driver of the 1st liquid crystal display 10,,, just repeat 1 picture and show (writing) according to the order driving grid bus 14-1～14-M of line by source bus line 16-1～16-L is applied display data signal.
At this moment, because the 2nd liquid crystal display 20 does not show, therefore apply low-voltage (switch controlling signal) from source electrode driver 15 to switch controlling signal line 18, all switching TFT 17 of switch portion 19 are all disconnected, with the source bus line 16 of the 2nd liquid crystal display 20 (source bus line 16 (16-1～16-L) carry out separating of electricity of 16-1～16-L) and the 1st liquid crystal display 10.In addition, at this moment, the grid bus 24 of the 2nd liquid crystal display 20 is not driven yet.
In above-mentioned action,, the load of the 2nd liquid crystal display 20 is carried out the separation of electricity showing relatively under the situation that the 1st high liquid crystal display 10 of frequency shows.Thereby, in liquid crystal indicator 1, can realize the reduction of power consumption.
On the other hand, under the situation that the 2nd liquid crystal display 20 shows, as shown in Figure 5, source bus line 16 is applied display data signal from source electrode driver 15, grid bus 24 is applied the signal that TFT25 uses that is switched on or switched off from gate drivers 23.At this moment, if the voltage of grid bus 24 is high level, then the TFT25 that is connected with this grid bus 24 is in on-state, and the display data signal that source bus line 16 is applied writes pixel (liquid crystal capacitance 26).
In the display driver of the 2nd liquid crystal display 20, by source bus line 16-1～16-L is applied display data signal, according to the order driving grid bus 24-1～24-N of line, just repeat 1 picture show (writing).
At this moment, because the 1st liquid crystal display 10 does not show, when the 2nd liquid crystal display 20 is applied display data signal, therefore apply high voltage (switch controlling signal) to switch controlling signal line 18 from source electrode driver 15, all switching TFT 17 of switch portion 19 are all connected.Just, 14-1～14-M does not drive to grid bus.
In above-mentioned action, under the situation that the 2nd liquid crystal display 20 shows, the load of the 1st liquid crystal display 10 can not be carried out the separation of electricity, need extra power.But the 2nd liquid crystal display 20 is to show the low display screen of frequency, and the probability that this kind situation takes place is very low.On the other hand, showing relatively under the situation that the 1st high liquid crystal display 10 of frequency shows,,, can realize the reduction of power consumption therefore as entire liquid crystal display device 1 because the 2nd liquid crystal display 20 is carried out the separation of electricity.
Also have, the load of above-mentioned electricity mainly is because of producing at the electric capacity of the insulation division at the position of intersecting with grid bus 14 with in TFT25 stray capacitance partly etc.
In addition, the 1st liquid crystal display 10 of mobile phone 40 and the configuration mode of the 2nd liquid crystal display 20 are not limited to above-mentioned situation.For example, in that mobile phone 40 is regarded as can switch with respect to the 1st housing section under the situation of device of the 2nd housing section, the 1st liquid crystal display 10 is provided with like this, promptly settling display surface with respect to outside surface one side of the 1st or the 2nd housing section under the state of the 1st housing section energy switch the 2nd housing section, and the 2nd liquid crystal display is provided with like this, is promptly settling display surface with respect to inside surface one side of the 1st or the 2nd housing section under the state of the 1st housing section energy switch the 2nd housing section.This point for the relation of 200 of secondary screen 100 described later and main screens too.
Here, in the liquid crystal indicator 1 of present embodiment, as mentioned above, show and be not provided with under the situation that the 2nd liquid crystal display 20 of a side of source electrode driver 15 do not show at the 1st liquid crystal display 10 of a side that only is provided with source electrode driver 15, utilize switch portion 19 that the 2nd liquid crystal display 20 and the 1st liquid crystal display 10 are separated.In this case, the problem below in the demonstration of the 2nd liquid crystal display 20, having taken place.
That is, for the switching TFT 17 of switch portion 19, be more than 1000 times of resistance value that are in on-state though be in the resistance value of off-state, being in off-state is not to be in state of insulation, can produce certain leakage current.Because this leakage current, make the current potential of source bus line 16 of the 2nd liquid crystal display 20 of the side that do not drive gradually change, finally converge on the average voltage of voltage of the source bus line 16 of the 1st liquid crystal display 10 that drives a side.Therefore, the drain electrode of the TFT25 of the 2nd liquid crystal display 20, the pixel electrode that promptly links to each other with drain electrode are applied the voltage of the source bus line 16 that gradually changes, according to the variation of the potential difference (PD) of the voltage of this voltage and opposite electrode, the show state of the 2nd liquid crystal display 20 correspondingly changes.Its result can not carry out undesired demonstration in the 2nd liquid crystal display 20 that drives.Also have, well-known, supply with opposed electrode voltage from opposed electrode voltage supply circuit (not shown) to opposite electrode.
In addition, in during switch portion 19 disconnects action (the 2nd liquid crystal display 20 do not carry out display action during in), do not repeat in switch portion 19 under the situation of temporary transient ON Action, because the leakage current of the switching TFT 17 of switch portion 19, make the current potential of source bus line 16 of the 2nd liquid crystal display 20 converge on the average potential of the source bus line 16 of the 1st liquid crystal display 10 that carries out display action.This average potential makes every source signal line 16 that delicate difference be arranged because of the difference of the display image of the 1st display part sometimes, in this case, each pixel electrode of the 2nd liquid crystal display 20 and each potential difference (PD) of opposite electrode are inhomogeneous, and the display frame of the 2nd liquid crystal display 20 is in the state that looks very uncomfortable.
In order to solve such problem, in the liquid crystal indicator 1, under the 1st state that liquid crystal display 10 shows and the 2nd liquid crystal display 20 does not show, switch portion 19 temporary transient and repetition ON Actions (repeating temporary transient ON Action), for example carry out ON Action, the source bus line 16 of the 2nd liquid crystal display 20 is supplied with constant potential from some cycles.
Fig. 6 represents to carry out the block diagram of the liquid crystal indicator 1 of above-mentioned action usefulness.Source electrode driver 15 and gate drivers 13,23 are supplied with required voltage these drivers from power circuit 51, and the action of source electrode driver 15 and gate drivers 13,23 is controlled by control circuit (control module) 52.
Fig. 7 is illustrated in that the 1st liquid crystal display 10 shows and the sequential chart from the output signal of source electrode driver 15 under the situation that the 2nd liquid crystal display 20 does not show, when not carrying out the temporary transient ON Action of the repetition of above-mentioned switch portion 19.
In Fig. 7, control signal S11 and control signal S12 are respectively the commencing signal and the clock signals of gate drivers 13 usefulness, and control signal S21 and control signal S22 are respectively the commencing signal and the clock signals of gate drivers 23 usefulness.Switch controlling signal S1 is the signal that is switched on or switched off control usefulness to the switch portion 19 of switch controlling signal line 18 supplies.Picture signal Si supplies with, is and the corresponding signal of picture displayed information to source bus line 16.
Under above-mentioned situation, switch controlling signal S1 is fixed on low level, and switch portion 19 is in off-state.In addition, control signal S21 and control signal S22 are fixed on high level, do not generate sweep signal in the 2nd liquid crystal display 20.Among the picture signal Si, during corresponding with the bar number of the grid bus 14 of the 1st liquid crystal display 10 be effective image during, be between dynamic stage during in addition.Also have, do not do special qualification about the current potential of the source bus line between dynamic stage 16.
In addition, Fig. 8 is illustrated in that the 1st liquid crystal display 10 does not show and under the situation that the 2nd liquid crystal display 20 shows, from the sequential chart of the output signal of source electrode driver 15.Also have, irrelevant with the temporary transient ON Action of the repetition of switch portion 19 here certainly.
Under situation shown in Figure 8, switch controlling signal S1 is in high level during above-mentioned effective image, and switch portion 19 at this moment is in on-state.In addition, control signal S11 and control signal S12 are fixed on high level, do not generate sweep signal in the 1st liquid crystal display 10.
On the other hand, Fig. 9 is illustrated in that the 1st liquid crystal display 10 shows and the sequential chart from the output signal of source electrode driver 15 under the situation that the 2nd liquid crystal display 20 does not show, when carrying out the temporary transient ON Action of the repetition of above-mentioned switch portion 19.
Under situation shown in Figure 9, switch controlling signal S1 beyond during effective image during in a part during in, be high level owing to switch portion 19 repeats temporary transient ON Action, be low level during in addition.Picture signal Si during to comprise switch controlling signal S1 at least be high level above-mentioned during, promptly supplying with constant potential during in be fixed on constant potential.Here, the temporary transient ON Action of the repetition of switch portion 19 beyond during effective image during in, be to carry out on per 1 vertical period ground.In addition, control signal S21 and control signal S22 are fixed on high level, do not generate sweep signal in the 2nd liquid crystal display 20.
According to above-mentioned action, the source bus line 16 of the 2nd liquid crystal display 20 of non-show state is supplied with constant potentials, the drain electrode of TFT25, be that the potential difference (PD) of pixel electrode and opposite electrode remains on steady state value.Thus, in the 2nd liquid crystal display 20 of non-show state, the show state of whole image is even and be in steady state, can prevent and carry out undesired demonstration.
Also have, the temporary transient ON Action of the repetition of switch portion 19 is not limited to carry out from some cycles, even carry out at random, so long as in the moment that can eliminate the variation in voltage that produces because of above-mentioned leakage current, the moment (moment that can ignore in the demonstration in the display frame variation of the show state that the variation in voltage because of above-mentioned leakage current generating causes) that maybe can ignore the variation in voltage that produces because of above-mentioned leakage current gets final product.Just, relatively good carrying out periodically on the manageable this point of the temporary transient ON Action of the repetition of switch portion 19 at each integral multiple of per 1 vertical cycle or 1 vertical cycle.
In addition, the constant potential of supplying with to the source bus line 16 of the 2nd liquid crystal display 20 by the temporary transient ON Action of the repetition of switch portion 19 is so long as carry out for example white, ash or black etc. even demonstration get final product qualification especially in the 2nd liquid crystal display 20.
Just, it is relatively good on this point that can obtain current potential easily to set the GND level as above-mentioned constant potential.
In addition, it would be desirable as above-mentioned constant potential, set and not produce pixel electrode and the current potential of the potential difference (PD) of opposite electrode, the i.e. current potential identical with the current potential of opposite electrode, the degree that reaches the potential change influence demonstration that produces owing to leakage current like this needs the regular hour, can elongate the interval of repeating temporary transient ON Action, carrying out to reduce power consumption aspect the temporary transient ON Action of repetition.
Also have, in these cases, the current potential of above-mentioned strictly speaking constant potential and opposite electrode can not be idiostatic also, promptly, if because of the potential difference (PD) liquid crystal of pixel electrode and opposite electrode does not react, be the potential range that the show state (non-show state) at the 2nd liquid crystal display 20 does not change, then can regard as and satisfy above-mentioned idiostatic condition.As an example, in the TN pattern, as long as to the potential difference (PD) of constant potential (pixel electrode current potential) that source bus line 16 is supplied with and opposite electrode current potential smaller or equal to 1V (± 1V and in), because because of this potential difference (PD) liquid crystal does not react, so show state (non-show state) does not change.Also have, in other pattern, because of the value of above-mentioned potential difference (PD) changes, therefore the scope of the current potential that can set is as long as suitably select according to its pattern.
In addition, also can be set at the average voltage of the source bus line 16 of the 1st liquid crystal display 10 that drives a side as above-mentioned constant potential.Under the situation of the temporary transient ON Action of the repetition of not carrying out switch portion 19, this average voltage is the voltage convergent voltage that makes the source bus line 16 of the 2nd liquid crystal display 20 because of above-mentioned leakage current as mentioned above.Thereby, as long as the source bus line 16 of the 2nd liquid crystal display 20 is supplied with above-mentioned average voltage, just can cut down due to leakage current and the power consumption that produces.The voltage of source bus line 16 owing to know above-mentioned average voltage, therefore also can be set such constant potential in the liquid crystal indicator that exchange to change with some cycles etc.For example, like that under the situation of the AC driving that simultaneously shows of the reversal of poles of the one side voltage that will apply, can be decided to be average voltage with exchanging the medium voltage that changes at liquid crystal indicator basically to source bus line 16.In addition, in direct drive, above-mentioned average voltage also can obtain by for example input data signal being calculated (summation of removing data with the line number) etc.This is an example, and the various methods of obtaining above-mentioned average voltage are arranged, and is not limited to which method.
In addition,, also can to the voltage that source bus line 15 is supplied with, select and the immediate voltage of above-mentioned average voltage, this voltage is supplied with as above-mentioned constant voltage from for example power circuit 51 as above-mentioned constant potential.
In said structure, can reduce the power consumption of liquid crystal indicator 1.That is, obtain exactly under the situation of the circuit of above-mentioned average voltage, on this circuit, can produce power consumption in other setting.But, use existing power circuit 51, selection and utilization and the immediate voltage of average voltage just can reduce power consumption from its a plurality of output voltages.
In addition, as mentioned above, through switch portion 19 (through switching TFT 17) with constant voltage (with the immediate voltage of above-mentioned average voltage) from the source bus line 16 of the 1st liquid crystal display 10 under the situation that the source bus line 16 of the 2nd liquid crystal display 20 is supplied with, best above-mentioned constant voltage is also supplied with to the opposite electrode (COM) 27 of the 2nd liquid crystal display 20.In such structure, can easily eliminate the potential difference (PD) between pixel electrode and the opposite electrode.
Also have, as with the scope of the immediate voltage of above-mentioned average voltage, be for example be subjected to the influence of above-mentioned leakage current and whole display frame by the 2nd liquid crystal display 20 all can not very clear scope of watching voltage.As an example, in the TN pattern, as long as the potential difference (PD) of the constant voltage of supplying with to source bus line 16 (pixel electrode voltage) and opposed electrode voltage just can satisfy above-mentioned condition smaller or equal to 1V.That is, in the TN pattern, as long as the potential difference (PD) of pixel electrode and opposite electrode is smaller or equal to 1V (± 1V and in), then owing to because of this potential difference (PD) liquid crystal does not react, so show state (non-show state) does not change.Also have, in other pattern, because of the value of above-mentioned potential difference (PD) changes, therefore the scope of selectable current potential is as long as suitably set according to its pattern.
Here, aspect the undesired demonstration of carrying out at the 2nd liquid crystal display 20 of the non-show state that prevents to produce because of above-mentioned leakage current, the current potential of grid bus 24 is compared with the current potential of source bus line 16 and is not very important.But, grid bus 24 becomes big with the potential difference (PD) of opposite electrode, when the influence of this potential difference (PD) displayed in the demonstration of the 2nd liquid crystal display 20, as long as to the current potential and source bus line 16 the same controls of grid bus 24, the current potential that reaches with the same level of source bus line 16 got final product.The temporary transient ON Action of i.e. repetition by switch portion 19 to source bus line 16 supply with above-mentioned constant voltage during in, as long as supply with and the current potential of the current potential of supplying with to source bus line 16 with level from 23 pairs of grid buss of gate drivers 24.Thus, can prevent near grid bus 24, to carry out undesired demonstration, can not obtain the situation of uniform show state as whole image because of the potential difference (PD) of grid bus 24 and opposite electrode.Also have, about grid bus 24 being supplied with and the current potential of the current potential of supplying with to source bus line 16 with level, also the situation with the above-mentioned current potential of supplying with to source bus line 16 is identical, can set same allowed band according to the pattern of TN pattern etc.
In addition, awarding the structure of above-mentioned constant potential from 23 pairs of grid buss 24 of gate drivers can be as described below.That is, gate drivers 23 switch to be connected two values and the output of voltage and off voltage with switch in general display action.Therefore, as long as supply with these, switch this voltage and export with above-mentioned switch and get final product from gate drivers 23 as above-mentioned constant voltages of connecting voltage or off voltage.
Other embodiment of the present invention below is described with reference to the accompanying drawings.
The liquid crystal indicator of present embodiment (display device) 2 has structure shown in Figure 10.That is, liquid crystal indicator 2 is made of the double screen that comprises secondary screen (the 1st display unit) 100 and main screen (the 2nd display unit) 200.Secondary screen 100 and main screen 200 are active matrix screens.In these secondary screens 100 and main screen 200, the gate drivers of driving grid bus comprises special-purpose gate drivers 113,123 respectively, and the source electrode driver that drives source bus line comprises the source electrode driver (source signal line drive circuit, constant potential feed unit) 115 that secondary screen 100 and main screen 200 are public.
The display data signal of source electrode driver 115 outputs is supplied with to the source bus line of main screen 200 through the source bus line of pair screen 100.Also have, the source bus line of secondary screen 100 and being connected of the source bus line of main screen 200 are that the link with flexible structure, for example FPC30 through being arranged between two screens carries out.
Here, the pixel quantity of main screen 200 wants many than pair screen 100, has high sharpness than pair screen 100.Thereby the source bus line of main screen 200 is more than the source bus line of pair screen 100.Therefore, in liquid crystal indicator 2,1 source bus line of secondary screen 100 is corresponding with many source bus line of main screen 200.That is, in liquid crystal indicator 2, to main screen 200 by display data signal bar (for example, being 2 in Figure 10) source bus line is supplied with of timesharing drive division 119 with 1 source bus line of pair screen 100.Specifically be exactly, the display data signal of 1 source bus line of pair screen 100 to be switched by timesharing corresponding many source bus line of main screen 200 supply with by each change-over switch of the timesharing drive division 119 formed by a plurality of change-over switches.
Like this, utilization is arranged on the source electrode driver 115 that the few pair of pixel quantity is shielded 100 1 sides, secondary screen 100 carries out general driving when overstepping one's bounds (drive), and the main screen 200 that pixel quantity is many is carried out timesharing and driven, by showing with high definition with respect to pair screen 100 in main screen 200 like this.
Figure 11 represents the circuit diagram of liquid crystal indicator shown in Figure 10 2.
In liquid crystal indicator 2, pair screen 100 is identical with above-mentioned the 1st liquid crystal display 10, has the liquid crystal capacitance 26 of TFT substrate 11, counter substrate 12 and liquid crystal layer formation that TFT25 is set.Configuration many grid buss 14, many source bus line 16 and above-mentioned TFT25 on TFT substrate 11.TFT25 applies voltage to the liquid crystal capacitance 26 that constitutes pixel between opposite electrode (COM) 27 that be provided with in counter substrate 12 and the pixel electrodes.
In the liquid crystal indicator 2 of present embodiment, timesharing drive division 119 is arranged on the main screen 200.This timesharing drive division 119 comprises the switching TFT 17 of every the source bus line 28 that is arranged on main screen 200.The pair that these switching TFT 17 are arranged on source bus line 28 is shielded the end of 100 1 sides.
In the liquid crystal indicator 2, owing to being to be made of for example 2 source bus line 28 that the display data signal that 1 source bus line 16 of pair screen 100 is supplied with is supplied with main screen 200 with time-sharing format, therefore 2 adjacent switching TFT 17 become 1 group.And, can be through switching TFT 17 with these switching TFT of 21 group, 17 corresponding 2 source bus line 28 and 1 source bus line 16 conducting.
In addition, timesharing drive division 119 has the 1st, the 2nd switching TFT 17 corresponding the 1st, the 2nd switch controlling signal line 18a, the 18b with each group.Wherein, the 1st switch controlling signal line 18a links to each other with the grid of the 1st switching TFT 17 of each group, and the 2nd switch controlling signal line 18b links to each other with the grid of the 2nd switching TFT 17 of each group.2 source bus line 28 switching TFT 17 usefulness, that be about to respectively organize to each group of the 1st, the 2nd switch controlling signal line 18a, 18b supply timesharing driving are carried out the timesharing switch controlling signal of logotype mutually with their corresponding 1 source bus line 16.
Also have,, when considering the efficient of for example wiring, be preferably on the main screen 200, but also can shield on 100 or between secondary screen 100 and the main screen 200 in pair about the allocation position of timesharing drive division 119.
Here, secondary screen 100 is for example in used device, use as the present situation of express time, this device or the display device of some brief information, main screen 200 is used as the display device that begins the more detailed information of display message (some details) display action, the secondary screen 100 of demonstration ratio according to for example operator's operation.
Specifically be exactly, for example shown in Fig. 2 (a) and (b), in clamshell phone 40 with respect to main part 41 energy switch case portions 42, secondary screen 100 is arranged on the outside surface (outside surface when being in folded state) of case portion 42, and main screen 200 is arranged on the inside surface (inside surface when being in folded state) of case portion 42.Fig. 3 represents the longitudinal sectional drawing of major part of the case portion 42 of this state.As shown in the drawing, secondary screen 100 and main screen 200 are arranged in case portion 42 inside and lean against opposed privately state.
As mentioned above, in liquid crystal indicator 2, shield 100 1 sides in the low pair of sharpness source electrode driver 115 is set, drive two display screens (secondary screen 100 and main screen 200) by a driving circuit (source electrode driver 115), utilize 119 pairs of main screens of timesharing drive division 200 to carry out timesharing and drive, and two display screens (secondary screen 100 and main screen 200) are separated.
In above-mentioned mobile phone 40, when using mobile phone when utilizing phone to converse, when Email carries out transmit operation and when receiving mail and carry out content check etc., case portion 42 is in opening.In this case, the display action of secondary screen 100 is not worked the display action work of main screen 200.On the other hand, close case portion 42 and be under waiting status or the non-working condition, the display action work of secondary screen 100, the display action of main screen 200 is not worked.In mobile phone 40, general the state of closing case portion 42 is more owing to for example compared with the state of opening case portion 42 in one day, therefore compares with main screen 200, and the demonstration frequency of secondary screen 100 is higher.
In above-mentioned liquid crystal indicator 2, close under the state of case portion 42, having only the display action of secondary screen 100 is duty, the display action of main screen 200 is an off position.In this case, be used to switch controlling signal, all switching TFT 17 of timesharing drive division 119 are all disconnected, do not supply with display data signal to the source bus line 28 of main screen 200 from source electrode driver 115 from source electrode driver 115.In addition, gate drivers 113 moves, and gate drivers 123 stops action.
On the other hand, in the state of opening case portion 42, have only the display action of main screen 200 in running order, the display action of secondary screen 100 is in off position.In this case, by the switching TFT 17 of the timesharing drive division 119 that moves according to switch controlling signal, will supply with to the source bus line 28 of main screen 200 from the display data signal of source electrode driver 115 from source electrode driver 115.In addition, gate drivers 113 stops action, and gate drivers 123 moves.
Follow the display action that explains above-mentioned secondary screen 100 and main screen 200.
When pair screen 100 shows, as shown in figure 12, source bus line 16 is applied display data signal from source electrode driver 15, grid bus 14 is applied the signal that TFT25 uses that is switched on or switched off from gate drivers 113.Here, if the voltage of grid bus 14 is high level, the TFT25 that then links to each other with this grid bus 14 connects, and the display data signal that is applied on the source bus line 16 writes pixel (liquid crystal capacitance 26).
In the display driver of pair screen 100,,, just repeat 1 picture and show (writing) according to the order driving grid bus 14-1～14-M of line by source bus line 16-1～16-L is applied display data signal.
At this moment, because main screen 200 does not show, therefore apply low-voltage from source electrode driver 115 to the 1st, the 2nd switch controlling signal line 18a, 18b, all switching TFT 17 of timesharing drive division 119 are all disconnected, the source bus line 28-1～28-L of main screen 200 is carried out the separation of electricity.In addition, at this moment, the driving of the grid bus 24-1～24-N of main screen 200 is not carried out yet.
In above-mentioned action, under the situation that the low pair screen 100 of sharpness shows, the separation of electricity is carried out in the load of the main screen 200 that sharpness is high.Thereby, in liquid crystal indicator 2, can realize the reduction of power consumption.
On the other hand, under the situation that main screen 200 shows, as shown in figure 13, source bus line 16 is applied display data signal from source electrode driver 115, grid bus 24 is applied the signal that TFT25 uses that is switched on or switched off from gate drivers 123.At this moment, if the voltage of grid bus 24 is high level, then the TFT25 that is connected with this grid bus 24 is in on-state, and the display data signal that puts on the source bus line 16 writes pixel (liquid crystal capacitance 26).
Here, in liquid crystal indicator 2, owing to will be sent to the source bus line 28 of the high main screen of sharpness 200 through the source bus line 16 of the low pair screen 100 of sharpness from the display data signal of source electrode driver 115, so can carry out the timesharing driving to the high main screen 200 of sharpness.
In the display driver of main screen 200,,, just repeat 1 picture and show (writing) according to the order driving grid bus 24-1～24-N of line by source bus line 16-1～16-L is applied display data signal.
At this moment,, but main screen 200 is applied display data signal, therefore control being switched on or switched off of switching TFT 17 of timesharing drive division 119 because secondary screen 100 do not show.Specifically be exactly, by from the 1st, the 2nd switch controlling signal line 18a, the switch controlling signal of 18b, being switched on or switched off of the switching TFT 17 that control links to each other with them supplied with display data signal to 2 source bus line 28, for example source bus line 28-1 and the 28-2 that constitutes 1 group by timesharing.Just, the driving of grid bus 14-1～14-M is not carried out.
In above-mentioned action, under the situation that the high main screen 200 of sharpness shows, the separation of electricity is carried out in the load of pair screen 100 that can not sharpness is low, needs extra power.But, in double screen structure with the low pair screen 100 of sharpness high main screen 200 and sharpness, under the situation of clamshell phone 40 grades, the pair screen 100 that general sharpness is low is used for the purposes that shows that relatively frequency is high, and the high main screen 200 of sharpness is used for the purposes that shows that relatively frequency is low.Thereby at liquid crystal indicator 2, in the user mode, the frequency of the above-mentioned state that generation main screen 200 shows is very low, can realize the reduction of power consumption as whole liquid crystal display state 2.
Also have, the load of above-mentioned electricity mainly is because of producing at the electric capacity of the insulation division at the position of intersecting with grid bus 14 with in TFT25 stray capacitance partly etc.
In above embodiment, the switching TFT 17 as linking to each other with capacitive load also can constitute as Figure 14.Switching TFT 17 shown in this figure is made of N-channel MOS FET301 and P channel mosfet 302 and phase inverter 303.In such CMOS structure, compare with the structure of single raceway groove, much less can carry out on this aspect of switch motion exactly is, also can stably carry out voltage level control on this aspect of ability, also is reasonable from this point.Also have, as switch motion, even the structure of being made up of the on-off element of single raceway groove is also no problem.
Also have, in liquid crystal indicator 2, become several drivings of cutting apart, just can freely determine the combination of the sharpness of secondary screen 100 and main screen 200 by timesharing driving with main screen 200.In the present embodiment, owing to carry out driving for 2 sliced times of cutting apart for main screen 200, so main screen 200 can show with 2 times sharpness of the sharpness that reaches secondary screen 100.
In addition, in liquid crystal indicator 2, because switching TFT 17 dual-purposes of timesharing drive division 119 drive the switch of usefulness and the separatory switch of secondary screen 100 and main screen 200 as timesharing, therefore compare with the situation that special-purpose switch is set respectively, component number is few, simple in structure, and cost is low.
In addition, in mobile phone 40, the 1st liquid crystal display 10 (secondary screen 100) that the 1st liquid crystal display 10 (secondary screen 100) of source electrode driver 15 (115) one sides is set, in other words just is arranged on the outside surface of case portion 42 is not limited to adopt the idle structure of display action when opening case portion 42, and also can adopt is no matter whether case portion 42 opens the structure that display action is all worked always.
In above embodiment, switching TFT 17 is by driving from the signal of source electrode driver 15 or source electrode driver 115, but also can adopt the structure that is driven by other driving circuit.
Here, in the liquid crystal indicator 2 of present embodiment, as mentioned above, show, be not provided with under the situation that the main screens 200 of a side of source electrode driver 115 do not show at the pair screen 100 that has only the side that source electrode driver 115 is set, utilize timesharing drive division 119 that main screen 200 and pair screen 100 are separated.In this case, identical with the situation of liquid crystal indicator 1, following problem takes place in the demonstration of main screen 200.
That is, for the switching TFT 17 of timesharing drive division 119, be more than 1000 times of resistance value that are in on-state though be in the resistance value of off-state, being in off-state is not to be in state of insulation, can produce certain leakage current.Because this leakage current, make the current potential of source bus line 28 of main screen 200 of the side that do not drive gradually change, finally converge on the average voltage of voltage of the source bus line 16 of the pair screen 100 that drives a side.Therefore, the drain electrode of the TFT25 of main screen 200, the pixel electrode that promptly links to each other with drain electrode are applied the voltage of the source bus line 28 that gradually changes, according to the variation of the potential difference (PD) of the voltage of this voltage and opposite electrode, the show state of main screen 200 correspondingly changes.Its result can carry out undesired demonstration in the main screen 200 that does not have to drive.
In addition, in during the disconnection of timesharing drive division 119 action (main screen 200 do not carry out display action during in), do not repeat at timesharing drive division 119 under the situation of temporary transient ON Action, because the leakage current of the switching TFT 17 of timesharing drive division 119, make the current potential of source bus line 28 of main screen 200 converge on the average potential of the source bus line 16 of the pair screen 100 that carries out display action.This average potential makes every source signal line 28 that delicate difference be arranged because of the difference of the display image of pair screen 100 sometimes, in this case, each pixel electrode of main screen 200 and each potential difference (PD) of opposite electrode are inhomogeneous, and the display frame of main screen 200 is in the state that looks very uncomfortable.
In order to solve such problem, in the liquid crystal indicator 2, under the state that pair screen 100 shows and main screen 200 does not show, timesharing drive division 119 temporary transient and repetition ON Actions (repeating temporary transient ON Action), for example carry out ON Action, the source bus line 28 of main screen 200 is supplied with constant potential with some cycles.
The structure of the liquid crystal indicator 2 that moves so as shown in Figure 6.
Figure 15 is illustrated in that secondary screen 100 shows and the sequential chart from the output signal of source electrode driver 15 under the situation that main screen 200 does not show, when not carrying out the temporary transient ON Action of the repetition of above-mentioned timesharing drive division 119.
In Figure 15, control signal S11 and control signal S12 are respectively the commencing signal and the clock signals of gate drivers 113 usefulness, and control signal S21 and control signal S22 are respectively the commencing signal and the clock signals of gate drivers 123 usefulness.Switch controlling signal S1, S2 are respectively to the signal that is switched on or switched off control usefulness of the 1st, the 2nd switch controlling signal line 18a, 18b switching TFT 17 that supply with, timesharing drive division 119.Picture signal Si to source bus line 16,28 supply with, with the corresponding signal of picture displayed information.
Under above-mentioned situation, switch controlling signal S1, S2 are fixed on low level, and timesharing drive division 119 is in off-state.In addition, control signal S21 and control signal S22 are fixed on high level, do not generate sweep signal in main screen 200.Among the picture signal Si, during corresponding with the bar number of the grid bus 14 of pair screen 100 be effective image during, be between dynamic stage during in addition.Also have, do not do special qualification about the current potential of the source bus line between dynamic stage 16.
In addition, Figure 16 is illustrated in that secondary screen 100 does not show and under the situation that main screen 200 shows, from the sequential chart of the output signal of source electrode driver 115.Also have, irrelevant with the temporary transient ON Action of the repetition of timesharing drive division 119 here certainly.
Under situation shown in Figure 16, switch controlling signal S1, S2 alternately are in high level during above-mentioned effective image, corresponding, and the switching TFT 17 of timesharing drive division 119 is switched on or switched off action.In addition, control signal S11 and control signal S12 are fixed on high level, do not generate sweep signal in pair screen 100.
On the other hand, Figure 17 is illustrated in that secondary screen 100 shows and the sequential chart from the output signal of source electrode driver 115 under the situation that main screen 200 does not show, when carrying out the temporary transient ON Action of the repetition of above-mentioned timesharing drive division 119.
Under situation shown in Figure 17, switch controlling signal S1, S2 beyond during effective image during in a part during in because timesharing drive division 119 repeats temporary transient ON Action and all be high level, be low level during in addition.Picture signal Si during to comprise switch controlling signal S1, S2 at least be high level above-mentioned during, promptly supplying with constant potential during in be fixed on constant potential.Here, the temporary transient ON Action of the repetition of timesharing drive division 119 beyond during effective image during in, be to carry out on per 1 vertical period ground.In addition, control signal S21 and control signal S22 are fixed on high level, do not generate sweep signal in main screen 200.
According to above-mentioned action, the source bus line 116 of the main screen 200 of non-show state is supplied with constant potentials, the drain electrode of TFT25, be that the potential difference (PD) of pixel electrode and opposite electrode remains on steady state value.Thus, in the main screen 200 of non-show state, the show state of whole image is even and be in steady state, can prevent and carry out undesired demonstration.
Also have, the temporary transient ON Action of the repetition of timesharing drive division 119 is not limited to carry out with some cycles, and this point is identical with liquid crystal indicator 1.Just, relatively good carrying out on the manageable this point of the temporary transient ON Action of the repetition of timesharing drive division 119 in each integral multiple cycle of per 1 vertical cycle or 1 vertical cycle, this is also identical with liquid crystal indicator 1.
In addition, be not particularly limited this point about the constant potential of supplying with to the source bus line 24 of main screen 200 by the temporary transient ON Action of the repetition of timesharing drive division 119, and, can use the current potential of explanation in the liquid crystal indicator 1 about as the selectable current potential of above-mentioned constant potential.
In addition, the influence that produces for the current potential that prevents grid bus 24 is preferably also controlled the current potential of grid bus 24, and this point also situation with liquid crystal indicator 1 is identical.
The invention is not restricted to above-mentioned each embodiment, as long as can do various changes in the scope shown in the claim, the technical method that will disclose respectively at different embodiments suitably makes up and getable embodiment is also contained in the technical scope of the present invention.
Display device of the present invention has a plurality of display parts, can be used to use the desk-top or fixed device of special-purpose AC power supplies, be particularly suitable for the mancarried device that mobile phone or PDA (Personal Digital Assistants, personal digital assistant) etc. have a plurality of display parts, require to carry out the low-power consumption of battery-operated usefulness.
As mentioned above, in the driving method of display device of the present invention and display device, also can adopt the temporary transient ON Action of above-mentioned repetition is the structure of carrying out with the integral multiple cycle of the vertical cycle of the 2nd display unit.
According to said structure, control repeats temporary transient ON Action easily.
In the driving method of above-mentioned display device and display device, also can adopt above-mentioned constant potential is structure with the same level of opposite electrode current potential of the 2nd display unit.
According to said structure, do not carry out in the 2nd display unit of display action, the potential difference (PD) of pixel electrode and opposite electrode is constant, produces the potential difference (PD) of pixel electrode and opposite electrode hardly, reaches due to leakage current like this and degree that the influence of the potential change that produces shows needs the regular hour.Thereby can elongate the interval of repeating temporary transient ON Action, carrying out reducing power consumption aspect the temporary transient ON Action of repetition.
The above-mentioned display device and the driving method of display device also can adopt the temporary transient ON Action of above-mentioned repetition during in above-mentioned constant potential and the current potential of the opposite electrode of the 2nd display unit all be the structure of GDN level.
According to said structure, in the 2nd display unit that does not carry out display action, the potential difference (PD) of pixel electrode and opposite electrode is constant, can easily obtain consequent current potential.
In the driving method of above-mentioned display device and display device, also can adopt above-mentioned constant potential is the structure of average potential of source signal line of carrying out the 1st display unit of display action.
According to said structure, it is constant not carrying out the pixel electrode of the 2nd display unit of display action and the potential difference (PD) of opposite electrode, can reduce the power consumption that the leakage current because of the 2nd switch element produces.That is, above-mentioned average potential is the current potential convergent current potential that makes the source signal line of the 2nd display unit owing to the leakage current of the 2nd switch element under the situation of carrying out the temporary transient ON Action of repetition.Thereby, as long as the source signal line at the 2nd display unit is supplied with above-mentioned average potential, just can reduce the power consumption that produces because of above-mentioned leakage current.
Above-mentioned display device also can adopt and comprise the power circuit of exporting a plurality of voltages and the structure that will use as above-mentioned constant voltage with the immediate voltage of average potential of the source signal line of the 1st display part that carries out display action from this power circuit to a plurality of voltages that above-mentioned source signal line drive circuit is supplied with.
In addition, the driving method of above-mentioned display device also can adopt in a plurality of voltages of supplying with to above-mentioned source signal line drive circuit the structure that will use as above-mentioned constant voltage with the immediate voltage of average potential of the source signal line of the 1st display part that carries out display action.
According to said structure, do not need to export the circuit of the special use of above-mentioned average potential, can reduce power consumption simultaneously.That is, under the situation that the circuit that can obtain above-mentioned average potential exactly is set in addition, to produce power consumption at this circuit.But, use existing power circuit, selection and utilization and the immediate voltage of average voltage just can reduce power consumption from its a plurality of output voltages.
Above-mentioned display device and display packing also can adopt, will be as above-mentioned constant potential with the immediate voltage of average potential of source signal line the 1st display part that carries out display action, also supply with the structure of the opposite electrode of the 2nd display part simultaneously.
According to said structure, can easily eliminate the potential difference (PD) between pixel electrode and the opposite electrode, can suitably prevent from not carry out the situation of carrying out undesired demonstration in the 2nd display unit of display action.
During the above-mentioned display device and the driving method of display device also can adopt during the temporary transient ON Action of above-mentioned repetition each bar signal line of the 2nd display part is provided the structure of above-mentioned constant potential.
According to said structure, more can suitably prevent from not carry out the situation of carrying out undesired demonstration in the 2nd display unit of display action.Promptly when the potential difference (PD) of signal line and opposite electrode was big, the meeting that influences of this potential difference (PD) sometimes manifested in the demonstration of the 2nd display unit.Therefore, in during repeating temporary transient ON Action, if to each bar signal line of the 2nd display unit also award above-mentioned constant potential, promptly with the current potential of opposite electrode with the current potential of the current potential of level, GND level, carry out display action the 1st display unit the source signal line average potential or supply with the immediate voltage of average potential in a plurality of voltages of source electrode signal-line driving circuit and source signal line the 1st display unit that carries out display action, just can avoid the influence that the demonstration of the 2nd display unit is produced because of the current potential of signal line.
Above-mentioned display device also can adopt than the 1st display unit, make the 2nd display unit in the structure that shows that the lower state of frequency uses.
According to said structure, the source signal alignment of display data signal through showing the 1st display unit that frequency is high relatively shows the source signal line supply of the 2nd display unit that frequency is low relatively.Thereby, under the user mode of display device,, shortened the time of the source signal line connection of the 2nd display unit with respect to the source signal line of the 1st display unit, can promote the reduction of power consumption.
It is the structure greater than the 1st display unit of the 2nd display unit that above-mentioned display device also can adopt the pixel quantity of the 1st display unit and the 2nd display unit.
According to said structure, comprise relative pixel few, be the 1st low display unit of sharpness with relative pixel many, be in the structure of the 2nd high display unit of sharpness, the 1st display unit that general relative pixel is few is used to the demonstration purposes that shows that frequency is high.Thereby, be suitable structure reducing on the power consumption.
Above-mentioned display device also can adopt following structures, promptly can on the device of switch the 2nd housing section the 1st display unit and the 2nd display unit be set with respect to the 1st housing section, the 1st display unit is arranged in the outside surface side of the 1st or the 2nd housing section of the folded state of the 2nd housing section being closed with respect to the 1st housing section and settles display surface, and the 2nd display unit is arranged in the inner surface side of the 1st or the 2nd housing section of above-mentioned folded state and settles display surface.
According to said structure, for comprise display device and can switch with respect to the 1st housing section the device of the 2nd housing section, in the user mode of display device, close the frequency height of the folded state of the 2nd housing section with respect to the 1st housing section.Thereby, the 1st display unit is arranged in the outside surface one side configuration display surface of the 1st or the 2nd housing section that is in folded state, the 2nd display unit is arranged in inside surface one side of the 1st or the 2nd housing section that is in folded state and settles display surface, and such structure is being suitable aspect the reduction power consumption.
Concrete embodiment of mentioning in the detailed description of the invention part or embodiment are in order to come to understand technology contents of the present invention, not to be limited to such concrete example, should not do the explanation of narrow sense, as long as in the scope of the claim of spirit of the present invention and the following stated, can carry out various changes and implementation.
Claims (31)
1. display device comprises:
The 1st display part, described the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near each cross-shaped portion of these the 1st signal lines and the 1st source signal line that dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line and through the 1st on-off element and the pixel electrode that described the 1st source signal line links to each other, the driving circuit of described many articles the 1st source signal lines being supplied with the source signal line of display data signal is set;
The 3rd on-off element of forming by semiconductor element;
The 2nd display part, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, that dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element near each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, each bar the 2nd source signal line links to each other through corresponding the 1st source signal line of the 3rd on-off element and the 1st display part, with the public described source signal line drive circuit of the 1st display part;
And the constant potential supply circuit, described constant potential supply circuit the 3rd on-off element be in disconnect action during in, each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential.
2. display device comprises:
The 1st display part, described the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near each cross-shaped portion of these the 1st signal lines and the 1st source signal line that dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line and through the 1st on-off element and the pixel electrode that described the 1st source signal line links to each other, the driving circuit of described many articles the 1st source signal lines being supplied with the source signal line of display data signal is set;
The 3rd on-off element of forming by semiconductor element;
The 2nd display part, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, that dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element near each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, each bar the 2nd source signal line links to each other through corresponding the 1st source signal line of the 3rd on-off element and the 1st display part, with the public described source signal line drive circuit of the 1st display part;
And control part, described control part is controlled the action that is switched on or switched off of the 3rd on-off element, in simultaneously during making the 3rd on-off element be in the disconnection action, for each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential the 3rd on-off element is carried out the temporary transient ON Action of repetition temporary transient and the repetition ON Action, and in during this repeats temporary transient ON Action, make constant potential output to each bar the 1st source signal line of the 1st display part from the driving circuit of described source signal line.
3. display device as claimed in claim 1 is characterized in that,
The action of being undertaken by the constant potential supply circuit, each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential was carried out with the cycle of the integral multiple of the vertical cycle of the 2nd display part.
4. display device as claimed in claim 2 is characterized in that,
The temporary transient ON Action of described repetition was carried out with the cycle of the integral multiple of the vertical cycle of the 2nd display part.
5. as any one the described display device in the claim 1～4, it is characterized in that,
Described constant potential is the current potential with the same level of opposite electrode current potential of the 2nd display part.
6. as any one the described display device in the claim 1～4, it is characterized in that,
The described constant potential in temporarily and repeatedly supplying with during the constant potential to each bar the 2nd source signal line of the 2nd display part and the opposite electrode current potential of the 2nd display part all are earth level.
7. as the described display device of claim 1～4, it is characterized in that,
Described constant potential is the average potential of the 1st source signal line of carrying out the 1st display part of display action.
8. as the described display device of claim 1～4, it is characterized in that,
Comprise the power circuit of exporting a plurality of voltages,, to a plurality of voltages that described source signal line drive circuit is supplied with, will use as described constant voltage from this described power circuit with the immediate voltage of average potential of the 1st source signal line of the 1st display part that carries out display action.
9. display device as claimed in claim 8 is characterized in that,
Will as described constant potential, with the immediate voltage of average potential of the 1st source signal line of the 1st display part that carries out display action, also supply with the opposite electrode of the 2nd display part simultaneously.
10. display device as claimed in claim 5 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
11. display device as claimed in claim 6 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
12. display device as claimed in claim 7 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
13. display device as claimed in claim 8 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
14. 9 described display device is characterized in that shown in claim,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
15. display device as claimed in claim 1 or 2 is characterized in that,
Than the 1st display part, the 2nd display part is showing that the lower state of frequency uses.
16. display device as claimed in claim 1 or 2 is characterized in that,
The pixel quantity of the 1st display part and the 2nd display part be the 2nd display part greater than the 1st display part.
17. display device as claimed in claim 1 or 2 is characterized in that,
But the 1st display part and the 2nd display part are arranged on the device with respect to the 1st housing section switch the 2nd housing section, the 1st display part is arranged in closes the inner surface side that the outside surface side of the 1st or the 2nd housing section of the folded state of the 2nd housing section settles display surface, the 2nd display part to be arranged in the 1st or the 2nd housing section of described folded state with respect to the 1st housing section and settles display surface.
18. the driving method of a display device is characterized in that,
Described display device comprises the 1st display part and the 2nd display part, wherein said the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line each cross-shaped portion of these the 1st signal lines and the 1st source signal line, and the pixel electrode that links to each other with described the 1st source signal line through the 1st on-off element, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, near dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element, in the driving method of described display device
The 3rd on-off element that each bar the 2nd source signal line of the 2nd display part is formed via semiconductor element links to each other with corresponding each bar the 1st source signal line of the 1st display part,
The 1st source signal line through the 1st display part is supplied with display data signal to the 2nd source signal line of the 2nd display part,
During the 3rd on-off element is in the disconnection action, each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential.
19. the driving method of a display device is characterized in that,
Described display device is comprising the 1st display part and the 2nd display part, wherein said the 1st display part has many articles the 1st signal lines, many articles the 1st source signal lines, near dispose and the 1st on-off element that control end switch motion links to each other with described the 1st signal line each cross-shaped portion of these the 1st signal lines and the 1st source signal line, and the pixel electrode that links to each other with described the 1st source signal line through the 1st on-off element, described the 2nd display part has many articles the 2nd signal lines, many articles the 2nd source signal lines, near dispose and the 2nd on-off element that control end switch motion links to each other with described the 2nd signal line each cross-shaped portion of these the 2nd signal lines and the 2nd source signal line, and the pixel electrode that links to each other with described the 2nd source signal line through the 2nd on-off element, in the driving method of described display device
The 3rd on-off element that each bar the 2nd source signal line of the 2nd display part is formed via semiconductor element links to each other with corresponding each bar the 1st source signal line of the 1st display part,
The 1st source signal line through the 1st display part is supplied with display data signal to the 2nd source signal line of the 2nd display part,
During the 3rd on-off element is in the disconnection action, for each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential the 3rd on-off element is carried out the temporary transient ON Action of repetition temporary transient and the repetition ON Action, and in during this repeats temporary transient ON Action, each bar the 1st source signal line of the 1st display part is supplied with constant potential.
20. the driving method of display device as claimed in claim 18 is characterized in that,
Each bar the 2nd source signal line of the 2nd display part temporarily and repeatedly being supplied with the action of constant potential carried out with the cycle of the integral multiple of the vertical cycle of the 2nd display part.
21. the driving method of display device as claimed in claim 19 is characterized in that,
The temporary transient ON Action of described repetition was carried out with the cycle of the integral multiple of the vertical cycle of the 2nd display part.
22. the driving method as any one the described display device in the claim 18～21 is characterized in that,
Described constant potential is the current potential with the same level of opposite electrode current potential of the 2nd display part.
23. the driving method as any one the described display device in the claim 18～21 is characterized in that,
The described constant potential in temporarily and repeatedly supplying with during the constant potential to each bar the 2nd source signal line of the 2nd display part and the opposite electrode current potential of the 2nd display part all are earth level.
24. the driving method as the described display device of claim 18～21 is characterized in that,
Described constant potential is the average potential of the 1st source signal line of carrying out the 1st display part of display action.
25. the driving method as the described display device of claim 18～21 is characterized in that,
From the source signal line drive circuit described many source signal lines are supplied with display data signal, simultaneously from a plurality of voltages of supplying with described source signal line drive circuit, will use as described constant potential with the immediate voltage of average potential of the 1st source signal line of the 1st display part that carries out display action.
26. the driving method of display device as claimed in claim 25 is characterized in that,
Will as described constant potential, with the immediate voltage of average potential of the 1st source signal line of the 1st display part that carries out display action, also supply with the opposite electrode of the 2nd display part simultaneously.
27. the driving method of display device as claimed in claim 22 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
28. the driving method of display device as claimed in claim 23 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
29. the driving method of display device as claimed in claim 24 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
30. the driving method of display device as claimed in claim 25 is characterized in that,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
31. the driving method of 26 described display device is characterized in that shown in claim,
During each bar the 2nd source signal line of the 2nd display part temporarily and is repeatedly supplied with constant potential, provide described constant potential to each bar the 2nd signal line of the 2nd display part.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2004123143 | 2004-04-19 | ||
| JP2004-123143 | 2004-04-19 | ||
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| JP2005036949 | 2005-02-14 | ||
| JP2005-036949 | 2005-02-14 |
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| CN105589236B (en) * | 2016-03-14 | 2019-07-12 | 昆山龙腾光电有限公司 | Foldable display module and display with it |
| CN110764320A (en) * | 2019-10-15 | 2020-02-07 | 精电(河源)显示技术有限公司 | Ultra-large liquid crystal display screen capable of displaying in split screen mode and split screen display method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003131250A (en) * | 2001-10-26 | 2003-05-08 | Nanox Corp | Liquid crystal display device and portable display device using the same |
| CN1484068A (en) * | 2002-08-09 | 2004-03-24 | 三洋电机株式会社 | Display device with plurality of display panel |
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| JP2002099262A (en) * | 2000-09-26 | 2002-04-05 | Toshiba Corp | Flat display device |
| JP2004117755A (en) * | 2002-09-25 | 2004-04-15 | Sharp Corp | Active matrix substrate and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003131250A (en) * | 2001-10-26 | 2003-05-08 | Nanox Corp | Liquid crystal display device and portable display device using the same |
| CN1484068A (en) * | 2002-08-09 | 2004-03-24 | 三洋电机株式会社 | Display device with plurality of display panel |
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| CN1690782A (en) | 2005-11-02 |
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