CN100454373C - Active matrix type display device - Google Patents
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- CN100454373C CN100454373C CNB2006100568852A CN200610056885A CN100454373C CN 100454373 C CN100454373 C CN 100454373C CN B2006100568852 A CNB2006100568852 A CN B2006100568852A CN 200610056885 A CN200610056885 A CN 200610056885A CN 100454373 C CN100454373 C CN 100454373C
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Abstract
A variation in a display image and duration of a residual image are reduced to improve quality of display of an active matrix type display device. A control circuit sequentially outputs a pre-charge pulse signal PCG 1 and a storage capacitor control pulse signal SC 1 in synchronization with a falling edge of a vertical start pulse signal STV. A pre-charge TFT in a pixel in a first row is turned on according to the pre-charge pulse signal PCG 1. As a result, a source and a gate of a driver TFT are short-circuited, both an electric potential at the gate and an electric potential at the source of the driver TFT become a positive power supply electric potential PVdd, and the driver TFT is turned off. After that, the storage capacitor control pulse signal SC 1 rises to a high level, and the electric potential at the gate of the driver transistor is raised by capacitive coupling. With this, electric characteristics of the driver TFT are initialized.
Description
Technical field
The present invention relates to the active-matrix type display device of the light-emitting component of tool organic electroluminescent element etc.
Background technology
In recent years, be used for replacing the display device of cathode ray tube (CRT) and LCD (LCD), be to develop the organic electroluminescence display device that adopts organic electroluminescent element (Organic ElectroLuminescent Device is hereinafter referred to as " organic electroluminescent element ").Especially, develop and have with the active-matrix type organic electroluminescence display device of thin film transistor (TFT) (Thin Film Transistor is hereinafter referred to as " TFT ") as the switching device that organic electroluminescent element is driven.
Below, with reference to description of drawings active-matrix type organic electroluminescence display device.Fig. 9 is the equivalent circuit diagram of organic electroluminescence display device.Fig. 9 only shows a pixel 210 in display panel configurations is rectangular a plurality of pixels.At the pixel selection signal line 211 that extends line direction and extend near the point of crossing of display signal line 212 of column direction, dispose the pixel selection TFT213 of N channel-style.Pixel selection is connected to pixel selection signal line 211 with the grid of TFT213, and drain electrode is connected to display signal line 212.On pixel selection signal line 211, be applied with the high level pixel selection signal G that vertical drive circuit 301 is exported, and pixel selection is with TFT213 and conducting corresponding with it.Shows signal D outputs to display signal line 212 from horizontal drive circuit 302.
Pixel selection is connected to the grid of the driving of P channel-style with TFT214 with the source electrode of TFT213.Drive the power lead 215 that is connected with supply positive supply current potential PVdd with the source electrode of TFT214.Drive the anode that is connected to organic electroluminescent element 216 with the drain electrode of TFT214.The negative electrode of organic electroluminescent element 216 is supplied with negative supply current potential CV.
In addition, between the grid and maintenance electric capacity line 217 that drive with TFT214, be connected with maintenance electric capacity 218.Keep electric capacity line 217 to be fixed on certain current potential.Keep electric capacity 218 be used for by pixel selection with TFT213 be applied to the shows signal D that drives with the TFT214 grid keep one vertically during.
The following describes the action of above-mentioned organic electroluminescence display device.When a horizontal period is applied to pixel selection signal line 211 with the pixel selection signal G of high level, pixel selection TFT213 conducting.So the shows signal D of display signal line 212 outputs is applied to the grid that drives with TFT214 by pixel selection with TFT213, and by keeping electric capacity 218 to keep.That is, shows signal D is written into pixel 210.
Afterwards, correspondence is applied to the shows signal D that drives with the TFT214 grid, making driving lead (conductance) with the electricity of TFT214 changes, when driving becomes conducting state with TFT214, the electric current that corresponding this electricity is led is supplied to organic electroluminescent element 216 by driving with TFT214, makes organic electroluminescent element 216 luminous with the brightness of corresponding this electric current.On the other hand, correspondence is fed to the shows signal D of its grid, when making driving become nonconducting state with TFT214, owing to driving with no current circulation among the TFT214, therefore make organic electroluminescent element 216 extinguish.The pixel 210 of all row is carried out above-mentioned action at one during vertical, the portrait of expectation can be illustrated on the whole display panel whereby.
Yet meeting produces the brightness disproportionation and the animation ghost problem of display panel in above-mentioned organic electroluminescence display device.Therefore, disclose, adopt the scanning series of signals (for example above-mentioned pixel selection signal G) of vertical drive circuit 301 to control between the light emission period of organic electroluminescent element 216, reduce brightness disproportionation and animation ghost time whereby as patent documentation 1.When constituting the viewing area of display panel as if pixel with the capable m row of n, when for example half during vertical is made as between light emission period with one, then to rise to the sequential of high level synchronous with the pixel selection signal G of the capable pixel selection signal line 211 of n/2, and organic electroluminescent element 216 is extinguished.
[patent documentation 1] TOHKEMY 2002-175035 communique.
Summary of the invention
(inventing problem to be solved)
Yet control mode is to set between the light emission period of hardware between the light emission period of patent documentation 1, in case set between light emission period, connects as long as change the distribution of physical property, just can't change between this light emission period.Change the connection of distribution and must change the distribution shielding, thereby the increase that produces the shielding cost, make the manufacturing cost of making this kind display panel again increase, and increase the problem during making.
(means that are used to deal with problems)
Active-matrix type display device of the present invention is characterised in that, has to be configured to rectangular a plurality of pixels; Each pixel has: the pixel selection transistor; Light-emitting component; And corresponding shows signal of supplying with transistor by above-mentioned pixel selection, the driving transistor that above-mentioned light-emitting component is driven; This external display device also has control circuit, to control above-mentioned driving to being applied to make vertical scanning begin the vertical initial pulse signal that carries out with transistorized conducting and non-conduction.
(effect of invention)
According to the present invention, in active-matrix type display device, can utilize vertical initial pulse signal freely to adjust between the light emission period of light-emitting component and during extinguishing, can reduce the demonstration inequality and the animation ghost of display panel by this adjustment, and promote display quality.
Description of drawings
Fig. 1 illustrates the equivalent circuit diagram of the organic electroluminescence display device of the first embodiment of the present invention.
Fig. 2 illustrates the sequential chart of driving method of the organic electroluminescence display device of the first embodiment of the present invention.
Fig. 3 is the equivalent circuit diagram of the display device of the second embodiment of the present invention.
Fig. 4 illustrates the sequential chart of driving method of the display device of the second embodiment of the present invention.
Fig. 5 is the equivalent circuit diagram of the organic electroluminescence display device of the third embodiment of the present invention.
Fig. 6 illustrates the sequential chart of driving method of the organic electroluminescence display device of the third embodiment of the present invention.
Fig. 7 is the equivalent circuit diagram of the display device of the fourth embodiment of the present invention.
Fig. 8 illustrates the sequential chart of driving method of the display device of the fourth embodiment of the present invention.
Fig. 9 is the equivalent circuit diagram of existing organic electroluminescence display device.
Figure 10 is the equivalent circuit diagram of the display device of the fifth embodiment of the present invention.
Figure 11 illustrates the sequential chart of driving method of the display device of the fifth embodiment of the present invention.
The main element symbol description:
210,210A, 210B pixel
211 pixel selection signal lines
212 display signal lines, 213 pixel selection TFT
214 drive 215 power leads with TFT
216 organic electroluminescent elements
217 keep electric capacity line 218 to keep electric capacity
220,225 precharge TFT
221 precharging signal lines, 301 vertical drive circuits
302 horizontal drive circuits, 303 control circuits
304 impulse meters, 305,306,307,308 control circuits
CKH1, CKH2 horizontal frequency
CKV1, CKV2 vertical frequency
CV negative supply current potential D shows signal
ENB enable signal G, G1, G2, G3 pixel selection signal
PCG1, PCG2 precharge pulse signal
PVdd positive supply current potential
SC1, SC2 keep the electric capacity control wave
The horizontal initial pulse signal of STH
The vertical initial pulse signal of STV
Embodiment
The active-matrix type organic electroluminescence display device of the first embodiment of the present invention is described with reference to the accompanying drawings.Fig. 1 illustrates the equivalent circuit diagram of this organic electroluminescence display device.Fig. 1 only shows the pixel 210A of first row and the pixel 210B of second row in display panel configurations is rectangular a plurality of pixels.Pixel 210A, 210B are adjacent to each other in column direction.In addition, the component part identical with Fig. 9 used identical Reference numeral and omitted its explanation in Fig. 1.Below, be that the N channel-style drives with TFT214 and describes for the P channel-style at pixel selection with TFT213 and precharge TFT220, but the present invention is not limited to these channel-styles.
In pixel 210A, between driving, be connected with precharge TFT220 with the source electrode of TFT214 and grid.This precharge is connected to precharging signal line 221 with the grid of TFT220, owing to be supplied with precharge pulse signal PCG1 on precharging signal line 221, therefore, precharge is switched with corresponding this precharge pulse signal PCG1 of TFT220.When the TFT220 conducting was used in precharge, the source electrode and the grid that drive with TFT214 can form short circuit.Whereby, the source potential and the grid potential that drive with TFT214 all are set to positive supply current potential PVdd, and therefore driving becomes non-conduction with TFT214.When making precharge use TFT220 non-conduction, the source electrode and the grid that drive with TFT214 become electrical isolation.In addition, do not supply set potential to keeping electric capacity line 217, but the described maintenance electric capacity control wave SC1 that becomes high level in the scheduled period after the supply.
Though pixel 210 also has same formation, on precharging signal line 221, be supplied with precharge pulse signal PCG2, keeping then being supplied with maintenance electric capacity control wave SC2 on the electric capacity line 217.
Thereby control circuit 303 is the circuit that produce above-mentioned precharge pulse signal PCG1, PCG2 and above-mentioned maintenance electric capacity control wave SC1, SC2 with the decline of vertical initial pulse signal STV synchronously.In Fig. 1, control circuit 303 is disposed at the outside of vertical drive circuit 301, but also can be arranged at the inside of vertical drive circuit 301.
The driving method of above-mentioned organic electroluminescence display device is described with reference to the accompanying drawings.Fig. 2 illustrates the sequential chart of driving method of the display device of present embodiment.Synchronous with the rising of vertical initial pulse signal STV, carry out pulse output successively from pixel selection signal G1, G2, the G3 of vertical drive circuit 301.
If be conceived to the pixel of first row, the pixel selection signal G1 of corresponding high level then, make the pixel selection of the capable pixel 210A that wins use TFT213 a horizontal period conducting, during this period, shows signal D outputs to display signal line 212 from horizontal drive circuit 302, and be applied to the grid that drives with TFT214 with TFT213 by pixel selection, simultaneously by keeping electric capacity 218 to keep.That is, shows signal D is written into pixel 210A.Afterwards, when correspondence is applied to the shows signal D that drives with the TFT214 grid and makes driving become conducting state with TFT214, the electric current that corresponding this electricity is led is supplied to organic electroluminescent element 216 by driving with TFT214, makes organic electroluminescent element 216 luminous with the brightness of corresponding this electric current.
When making pixel selection signal G1 return low level a horizontal period end, though pixel selection TFT213 is non-conduction, therefore shows signal D, can continue between the light emission period of organic electroluminescent element 216 by keeping electric capacity 218 to keep.Promptly, the pixel respective pixel of first row is selected the rising of signal G1 and is made and begin between light emission period, the pixel respective pixel of second row is selected the rising of signal G2 and is made and begin between light emission period, and the pixel respective pixel of the third line is selected the rising of signal G3 and made between light emission period and begin.
Afterwards, synchronous with the decline of vertical initial pulse signal STV, export precharge pulse signal PCG1, PCG2 successively and keep electric capacity control wave SC1, SC2 from control circuit 303.If be conceived to the pixel of first row, then the precharge pulse signal PCG1 of corresponding high level makes precharge become conducting with TFT220.So the source electrode that drives with TFT214 forms short circuit with grid, it is identical with source potential and become positive supply current potential PVdd to drive grid potential with TFT214, and driving becomes non-conduction with TFT214.Whereby because organic electroluminescent element 216 extinguishes, so finishes between light emission period, and during beginning to extinguish, last till during this extinguishes that pixel selection signal G1 rises to high level during the next one is vertical till.
Afterwards, when precharge pulse signal PCG1 became low level, precharge became non-conduction with TFT220, and drove with becoming insulation between the source electrode of TFT214 and the grid.After or simultaneously, keep electric capacity control wave SC1 to rise to high level.Like this, owing to keep the capacitive coupling effect of electric capacity 218, make to drive to be changed to the voltage variety Δ V (for example about 10V) of high level and to rise from low level with the corresponding maintenance of the grid potential electric capacity control wave SC1 of TFT214.
Whereby, the grid potential that drives with TFT214 becomes also higher than source potential.If writing because of last shows signal D, charge carrier (hole) is collected at the gate insulating film place that drives with TFT214, then these charge carriers (hole) owing to from the grid to the source electrode or the electric field of drain electrode become tunnel current, thereby from gate insulating film by drawing to source electrode or drain electrode.Whereby, make the electrical specification Initiation that drives with TFT214.Thus, when during the next picture frame shows signal D being write pixel, the electric current of the suitable current value of corresponding this shows signal D is negotiable the driving with among the TFT214.
The pixel of second row too, between light emission period from the rising of pixel selection signal G2.After the precharge pulse signal PCG1 of first row was changed to low level, the precharge pulse signal PCG2 of second row rose then, and precharge becomes conducting with TFT220.Afterwards, if precharge pulse signal PCG2 is changed to low level, then precharge becomes non-conductionly with TFT220, and drives with becoming insulation between the source electrode of TFT214 and the grid.After or simultaneously, keep electric capacity control wave SC2 to rise to high level.So, owing to keep the capacitive coupling effect of electric capacity 218, make to drive being changed to the voltage variety Δ V of high level and rising with the corresponding maintenance of the grid potential electric capacity control wave SC2 of TFT214 from low level.Whereby, make the electrical specification Initiation that drives with TFT214.The later pixel of the third line is carried out same action.
According to present embodiment, by controlling the pulse width of vertical initial pulse signal STV, do not need to follow as in the past light shield change, can be freely to regulating between the light emission period of the organic electroluminescent element 216 of each pixel and during extinguishing.Demonstration inequality and the animation ghost time that can reduce display panel by this adjusting, thus quality of cartooon pictures promoted.In addition, the maintenance electric capacity control wave SC1 of high level is supplied to keep electric capacity line 217, whereby, can makes the Initiation that drives with the electrical specification of TFT214 reach optimization, and further suppress the ghost phenomena of display panel.
The active-matrix type organic electroluminescence display device of the second embodiment of the present invention is described with reference to the accompanying drawings.Fig. 3 illustrates the equivalent circuit diagram of this organic electroluminescence display device.In Fig. 3, from display panel configurations is rectangular a plurality of pixels, only show the pixel 210A of first row and the pixel 210B of second row.Pixel 210A, 210B are adjacent to each other in line direction.In addition, the component part identical with Fig. 9 is endowed identical Reference numeral and omits its explanation in Fig. 3.
In first embodiment, utilize the pulse width of vertical initial pulse signal STV to regulate between the light emission period of organic electroluminescent element 216 of each pixel and the length during extinguishing, and carry out Initiation to driving with the electrical specification of TFT214 in during extinguishing.With respect to this, in the present embodiment, one vertical during in import two vertical initial pulse signal STV, vertical with second whereby initial pulse signal STV is synchronous, produce above-mentioned precharge pulse signal PCG1, PCG2 and aforementioned maintenance electric capacity control wave SC1, SC2, be used to regulate between light emission period and during extinguishing.
In Fig. 3, be provided with the impulse meter 304 that the pulse number of vertical initial pulse signal STV is counted.When 304 couples two vertical initial pulse signal STV of impulse meter counted, control circuit 305 produced precharge pulse signal PCG1, PCG2 and aforementioned maintenance electric capacity control wave SC1, SC2 according to this count value.In Fig. 3, impulse meter 304 and control circuit 305 are configured in vertical drive circuit 301 outsides, but also can be arranged on vertical drive circuit 301 inside.
The driving method of the organic electroluminescence display device of second embodiment is described with reference to the accompanying drawings.Fig. 4 illustrates the sequential chart of driving method of the display device of present embodiment.The rising of vertical initial pulse signal STV with first is synchronous, and will be from pixel selection signal G1, G2, the G3 earth pulse output successively of vertical drive circuit 301.
Thus, identical with first embodiment, shows signal D is write the pixel of first row, second row, the third line successively.Afterwards, when second vertical initial pulse signal STV rises to high level, from the precharge pulse signal PCG1 of control circuit 305 outputs first row.Corresponding this precharge pulse signal PCG1 makes precharge become conducting with TFT220.Action afterwards is identical with first embodiment, when precharge pulse signal PCG1 is changed to low level, keeps electric capacity control wave SC1 to rise to high level.Afterwards, during the extinguishing of organic electroluminescent element 216, make the electrical specification Initiation that drives with TFT214.
The pixel of second row is also identical, and when the precharge pulse signal PCG1 of first row was changed to low level, the precharge pulse signal PCG2 of second row rose.In case when precharge pulse signal PCG2 is changed to low level, keep electric capacity control wave SC2 to rise to high level.Afterwards, during the extinguishing of organic electroluminescent element 216, make the electrical specification Initiation that drives with TFT214.The later residual pixel of the third line also carries out identical action.
In addition, in the present embodiment, input has two vertical initial pulse signal STV, but also can import the vertical initial pulse signal STV more than 3.Pulse number by 304 couples of vertical initial pulse signal STV of impulse meter is counted, the length during promptly scalable is extinguished.
The active-matrix type organic electroluminescence display device of the third embodiment of the present invention is described with reference to the accompanying drawings.Fig. 5 illustrates the equivalent circuit diagram of this organic electroluminescence display device.Be provided with in a second embodiment and be used to make driving to become non-conduction precharge TFT220, but in the present embodiment, precharge is removed with TFT220 and precharging signal line 221 with TFT214.In addition, identical with second embodiment, be provided with the impulse meter 304 that the pulse number of vertical initial pulse signal STV is counted.In case 304 couples two vertical initial pulse signal STV of impulse meter count, control circuit 306 promptly produces according to this count value and keeps electric capacity control wave SC1, SC2.That is, in the present embodiment, will keep electric capacity control wave SC1, SC2 to be converted into high level, it is non-conduction that driving is become with TFT214.
The driving method of the organic electroluminescence display device of the 3rd embodiment is described with reference to the accompanying drawings.Fig. 6 illustrates the sequential chart of driving method of the display device of present embodiment.The rising of vertical initial pulse signal STV with first is synchronous, and will be from pixel selection signal G1, G2, the G3 earth pulse output successively of vertical drive circuit 301.
Respective pixel is selected signal G1, G2, G3, and shows signal D is written into the pixel of first row, second row, the third line successively, and begins between the light emission period of each row.Afterwards, when second vertical initial pulse signal STV rose to high level, the first maintenance electric capacity control wave SC1 that goes that exports from control circuit 305 rose to high level.Whereby, owing to keep the capacitive coupling effect of electric capacity 218, make to drive to be changed to the voltage variety Δ V of high level and to rise from low level with the corresponding maintenance of the grid potential electric capacity control wave SC1 of TFT214.If this voltage variety Δ V is very big, and the driving of P channel-style just becomes non-conduction with TFT214, and during the extinguishing of beginning organic electroluminescent element 216.Specifically, if the relation of Vs-Vg＜Vt sets up, then drive become with TFT214 non-conduction.Vs is the source potential that drives with TFT214, is positive supply current potential PVdd.Vg accepts voltage variety Δ V and the grid potential that rises, and Vt is the absolute value that drives with the threshold voltage of TFT214.
Afterwards, the enable signal ENB that produces during beginning during the next one is vertical keeps electric capacity control wave SC1 to be changed to low level from high level after the scheduled delay that rises, and the mode that finishes during extinguishing is set.
The pixel of second row is also identical, and after the maintenance electric capacity control wave SC1 of first row rose to high level, the maintenance electric capacity control wave SC2 of second row rose to high level, makes between the light emission period of the second row pixel to finish, and during beginning to extinguish.In addition, the pixel of the third line is also identical, and after the maintenance electric capacity control wave SC2 of second row rose to high level, the maintenance electric capacity control wave SC3 of the third line rose to high level, make between the light emission period of the third line pixel and finish, and during beginning to extinguish.The later residual pixel of fourth line also carries out identical action.In addition, as the formation that precharge is removed with TFT220 and precharging signal line 221 of present embodiment, also applicable to first embodiment.
The active-matrix type organic electroluminescence display device of the fourth embodiment of the present invention is described with reference to the accompanying drawings.Fig. 7 illustrates the equivalent circuit diagram of this organic electroluminescence display device.In a second embodiment, driving with TFT214 is the P channel-style, but in the present embodiment, driving with TFT214 then is the N channel-style.Follow this change, precharge also changes to as shown in Figure 7 with the junction of TFT225.
The driving method of the organic electroluminescence display device of the 4th embodiment is described with reference to the accompanying drawings.Fig. 8 illustrates the sequential chart of driving method of the display device of present embodiment.The rising of vertical initial pulse signal STV with first is synchronous, and will be from pixel selection signal G1, G2, the G3 earth pulse output successively of vertical drive circuit 301.
Thus, identical with second embodiment, shows signal D is written into the pixel of first row, second row, the third line successively, and begins between the light emission period of each row.Afterwards, when second vertical initial pulse signal STV rises to high level, from the precharge pulse signal PCG1 of control circuit 307 outputs first row.
Corresponding this precharge pulse signal PCG1 makes precharge become conducting with TFT225.So the source electrode that drives with TFT214 forms short circuit with grid, the grid potential that drives with TFT214 becomes identical current potential with source potential, and that driving becomes with TFT214 is non-conduction.Whereby,, so finish between light emission period and during beginning to extinguish because organic electroluminescent element 216 extinguishes, last till during this extinguishes next vertical during pixel selection signal G1 rise to till the high level.In addition, as mentioned above, drive and use TFT214 to constitute also applicable to first embodiment with the N channel-style.
The active-matrix type organic electroluminescence display device of the fifth embodiment of the present invention is described with reference to the accompanying drawings.Figure 10 illustrates the equivalent circuit diagram of this organic electroluminescence display device.Present embodiment is identical with the 3rd embodiment, and precharge is removed with TFT220 and precharging signal line 221.Be not to be provided with the impulse meter 304 that the pulse number of vertical initial pulse signal STV is counted with the 3rd embodiment difference.Afterwards, control circuit 308 is synchronous with the decline of vertical initial pulse signal STV, keeps electric capacity control wave SC1, SC2 and produce.By these being kept electric capacity control wave SC1, SC2 are converted into high level, it is non-conduction that driving is become with TFT214, and during beginning to extinguish.
The driving method of the organic electroluminescence display device of the 5th embodiment is described with reference to the accompanying drawings.Figure 11 illustrates the sequential chart of driving method of the display device of present embodiment.Vertical initial pulse signal STV with first rises synchronously towards high level, and will be from pixel selection signal G1, G2, the G3 earth pulse output successively of vertical drive circuit 301.
Respective pixel is selected signal G1, G2, G3, and shows signal D is write the pixel of first row, second row, the third line successively, and begins between the light emission period of each row.Afterwards, when vertical initial pulse signal STV dropped to low level, the first maintenance electric capacity control wave SC1 that goes that exports from control circuit 308 rose to high level.Whereby, owing to keep the capacitive coupling effect of electric capacity 218, make to drive to be changed to the voltage variety Δ V of high level and to rise from low level with the corresponding maintenance of the grid potential electric capacity control wave SC1 of TFT214.If this voltage variety Δ V is very big, then the driving of P channel-style become with TFT214 non-conduction, thereby during the extinguishing of beginning organic electroluminescent element 216.Specifically, if the relation of Vs-Vg＜Vt sets up, then drive become with TFT214 non-conduction.Vs is the source potential that drives with TFT214, is positive supply current potential PVdd.Vg accepts voltage variety Δ V and the grid potential that rises, and Vt is the absolute value that drives with the threshold voltage of TFT214.Afterwards, the enable signal ENB that is produced when next horizontal period begins keeps electric capacity control wave SC1 to be changed to low level from high level after the scheduled delay that rises, and the mode that finishes during extinguishing is set.
The pixel of second row is also identical, and after the maintenance electric capacity control wave SC1 of first row rose to high level, the maintenance electric capacity control wave SC2 of second row rose to high level, makes to finish between the light emission period of the second row pixel and during beginning to extinguish.In addition, the pixel of the third line is also identical, after the maintenance electric capacity control wave SC2 of second row rose to high level, the maintenance electric capacity control wave SC3 of the third line rose to high level, made to finish between the light emission period of pixel of the third line and during beginning to extinguish.The later residual pixel of fourth line also carries out identical action.
In addition, the various embodiments described above are to be that example describes with the situation that display device is made of the voltage driven type image element circuit, be voltage signal though be fed to the shows signal D of each pixel, but the present invention are also applicable to the current drive-type image element circuit.In the case, shows signal D is a current signal.
According to the various embodiments described above, can be by utilizing vertical initial pulse signals STV between the light emission period of the organic electroluminescent element 216 of each pixel of free adjustment.Regulate by this, demonstration inequality and the ghost time that can reduce display panel, and promote quality of cartooon pictures.In addition, owing to can find out between optimal light emission period, therefore also can shorten between development stage effectively and reduce cost of development in the development phase of display device.Moreover, because the user that can make display panel is to controlling between above-mentioned light emission period, so the user can be with the display panel applications of same size in the application software that cooperates this purpose.For example, in the display panel that the video camera based on animation display uses, can shorten fluorescent lifetime and make animation reactive good, and in the display panel that camera uses, can prolong fluorescent lifetime for preventing flicker.
Claims (9)
1. an active-matrix type display device is characterized in that, has to be configured to rectangular a plurality of pixels; Each pixel has: the pixel selection transistor; Light-emitting component; And corresponding shows signal of supplying with transistor driving transistor that described light-emitting component is driven by described pixel selection;
Display device also has control circuit, and it controls described driving with transistorized conducting and non-conduction to being applied to make vertical scanning begin the vertical initial pulse signal that carries out.
2. active-matrix type display device according to claim 1, wherein, the corresponding described vertical initial pulse signal of described control circuit is changed to second level from first level, and it is non-conduction that described driving is become with transistor, and described light-emitting component is extinguished.
3. active-matrix type display device according to claim 1, wherein, described control circuit connects the counter circuit that the number of described vertical initial pulse signal is counted, and when the count value of described counter circuit reaches predetermined number, it is non-conduction that described driving is become with transistor, and described light-emitting component is extinguished.
4. an active-matrix type display device is characterized in that, has to be configured to rectangular a plurality of pixels; Each pixel has: the pixel selection transistor; Light-emitting component; Corresponding shows signal of supplying with transistor by described pixel selection and to the driving that described light-emitting component drives transistor; Be connected described driving with transistorized grid and the maintenance electric capacity that keeps between the electric capacity line and described shows signal is kept; And corresponding precharge pulse signal and conducting and make described driving form the precharge transistor of short circuit with transistorized source electrode and grid;
Display device also has control circuit, and it makes vertical scanning begin the vertical initial pulse signal that carries out and export described precharge pulse signal being applied to, and makes described precharge use transistor in the scheduled period conducting.
5. active-matrix type display device according to claim 4, wherein, described control circuit described precharge with transistor through becoming after the described scheduled period when non-conduction, to keep the electric capacity control wave to output to described maintenance electric capacity line, and make described driving become non-conduction mode with transistor, described driving is changed with respect to source potential with transistorized grid potential.
6. according to claim 4 or 5 described active-matrix type display device, wherein, the corresponding described vertical initial pulse signal of described control circuit is changed to second level and exports described precharge pulse signal from first level.
7. according to claim 4 or 5 described active-matrix type display device, wherein, described control circuit connects the counter circuit that the number of described vertical initial pulse signal is counted, and when the count value of described counter circuit reaches predetermined number, described precharge pulse signal is exported.
8. an active-matrix type display device is characterized in that, has to be configured to rectangular a plurality of pixels; And each pixel has: the pixel selection transistor; Light-emitting component; Corresponding shows signal of supplying with transistor by described pixel selection and to the driving that described light-emitting component drives transistor; And be connected described driving with transistorized grid and the maintenance electric capacity that keeps between the electric capacity line and described shows signal is kept;
Display device also has control circuit, it is changed to second level and will keeps the electric capacity control wave to output to described maintenance electric capacity line from first level the vertical initial pulse signal that is applied to make vertical scanning begin to carry out, whereby, by making described driving become non-conduction mode, described driving is changed with respect to source potential with transistorized grid potential with transistor.
9. according to each the described active-matrix type display device in the claim 1,2,3,4,8, wherein, described light-emitting component is an organic electroluminescent element.
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Patent Citations (4)
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| US20020195968A1 (en) * | 2001-06-22 | 2002-12-26 | International Business Machines Corporation | Oled current drive pixel circuit |
| US20040056605A1 (en) * | 2002-09-25 | 2004-03-25 | Tohoku Pioneer Corporation | Device for driving luminescent display panel |
| CN1521718A (en) * | 2003-02-12 | 2004-08-18 | 精工爱普生株式会社 | Electrooptical device drive method and electronic apparatus |
| CN1588516A (en) * | 2004-07-13 | 2005-03-02 | 友达光电股份有限公司 | Pixel structure and its driving method and display using said pixel structure |
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| CN1831919A (en) | 2006-09-13 |
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