CN204117567U - A kind of image element circuit and display panel - Google Patents
A kind of image element circuit and display panel Download PDFInfo
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- CN204117567U CN204117567U CN201420677581.8U CN201420677581U CN204117567U CN 204117567 U CN204117567 U CN 204117567U CN 201420677581 U CN201420677581 U CN 201420677581U CN 204117567 U CN204117567 U CN 204117567U
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- electric capacity
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Abstract
The utility model provides a kind of image element circuit and display panel, this image element circuit comprises charging module, luminescent device and electric capacity, described charging module is connected with the first end of described electric capacity, for utilizing voltage data signal to described capacitor charging under the control of sweep signal; The first end of described luminescent device is connected with the first end of described electric capacity, and the second end of described luminescent device connects low level voltage line; Second end of described electric capacity connects reference voltage line; Described reference voltage line terminates to this frame period for making the moment of described luminescent device in described voltage signal gradually elevation process start continuous illumination, and this moment is determined by the magnitude of voltage of described voltage data signal.The utility model achieves the width modulation identical with frame frequency of pixel data refreshing frequency and drives, and solves the problem that in pixel, the working current of luminescent device is large, serviceable life is low, have simultaneously low in energy consumption, structure simple, be easy to the feature that realizes.
Description
Technical field
The utility model relates to organic light emitting display field, is specifically related to a kind of image element circuit and display panel.
Background technology
Existing AMOLED (Active Matrix/Organic Light Emitting Diode, active matrix organic light-emitting diode) display in exist two kinds drive types: analog-driven (Analog Driving) and width modulation (Plus Width Modulation, PWM).
Wherein, in the AMOLED pixel circuit adopting analog-driven, the electric current flowing through pixel OLED controls by display gray scale grade, and therefore it be conducive to OLED life owing to infrequently working in maximum current.But under the type, usual driving element (as TFT, Thin-Film Transistor, thin film transistor (TFT)) needs to bear larger voltage modulated dividing potential drop, and produce ineffective power consumption, therefore efficiency is lower.In addition, accurate Current Control demand can cause the complicated of related pixel circuit usually.
Comparatively speaking, in the AMOLED pixel circuit adopting width modulation to drive, TFT is operated in linear zone, and pressure drop is very little, and therefore ineffective power consumption is low, more meets the user demand of existing display device low-power consumption.
But, width modulation drive usually exist signal refresh and drive actions frequency far above the situation of display frame frequency, cause circuit realiration difficult.And because pixel OLED only has " breaking " two states of " leading to " and the zero current working in maximum current, pixel OLED open period working current is large, easily causes reduce the serviceable life of pixel OLED.
Utility model content
(1) technical matters solved
For the deficiencies in the prior art, the utility model provides a kind of image element circuit and display panel, it achieves the width modulation identical with frame frequency of pixel data refreshing frequency and drives, and solve the problem that in pixel, the working current of luminescent device is large, serviceable life is low, have simultaneously low in energy consumption, structure simple, be easy to the feature that realizes.
(2) technical scheme
For realizing above object, the utility model is achieved by the following technical programs:
A kind of image element circuit, it is characterized in that, described image element circuit comprises charging module, luminescent device and electric capacity,
Described charging module is connected with the first end of described electric capacity, for utilizing voltage data signal to described capacitor charging under the control of sweep signal;
The first end of described luminescent device is connected with the first end of described electric capacity, and the second end of described luminescent device connects low level voltage line, for the galvanoluminescence that basis flows into from the first end of described luminescent device;
Second end of described electric capacity connects reference voltage line;
In each frame period, described reference voltage line is utilizing described voltage data signal to exporting the first voltage during described capacitor charging, and the voltage signal raised gradually to tertiary voltage output from the second voltage after described charging complete terminated to this frame period; Described first voltage is less than described second voltage, and described second voltage is less than described tertiary voltage;
Described reference voltage line terminates to this frame period for making the moment of described luminescent device in described voltage signal gradually elevation process start continuous illumination, and this moment is determined by the magnitude of voltage of described voltage data signal.
Preferably, described charging module comprises the first on-off element, the first end of described first on-off element connects described voltage data signal, the control end of described first on-off element connects described sweep signal, and the second end of described first on-off element is connected with the first end of the first end of described luminescent device, described electric capacity.
Preferably, described image element circuit also comprises backward current and prevents module, in the connection utilizing described voltage data signal to the second end and described low level voltage line that disconnect described luminescent device during described capacitor charging.
Preferably, described backward current prevents module from comprising second switch element, and the first end of described second switch element is connected with the second end of described luminescent device, and the second end of described second switch element connects low level voltage line.
Preferably, arbitrary described on-off element is n channel type thin-film transistor or p channel type thin-film transistor.
Preferably, described first on-off element is p channel type thin-film transistor, and described second switch element is n channel type thin-film transistor,
Or,
Described first on-off element is n channel type thin-film transistor, and described second switch element is p channel type thin-film transistor;
The control end of described second switch element connects described sweep signal.
Preferably, described first on-off element and described second switch element are all n channel type thin-film transistor or p channel type thin-film transistor;
The control end of described second switch element connects the inversion signal of described sweep signal.
Preferably, described luminescent device is Organic Light Emitting Diode.
A kind of display panel, comprises array base palte and/or color membrane substrates, it is characterized in that, the pixel cell on described array base palte and/or color membrane substrates adopts any one image element circuit above-mentioned.
(3) beneficial effect
The utility model at least has following beneficial effect:
The utility model mainly utilizes the charge and discharge process of electric capacity, with electric capacity one end the change in voltage connect on reference voltage line light-emitting component continuous illumination from a moment in the frame period was terminated to this frame period, and this time the position be engraved in this frame period determine according to voltage data signal.That is, image element circuit can determine the fluorescent lifetime length of wherein luminescent device in each frame period according to the size of voltage data signal, namely achieves image element circuit and drives for the width modulation of brightness.Simultaneously, now image element circuit does not need high-frequency Refresh Data, the frequency of Refresh Data is identical with frame frequency, and thus luminescent device there will not be the situation that cut-in voltage is excessive and immediate current is excessive, namely solves the problem that working current is large, serviceable life is low of pixel light emission device.
And compared to analog-driven mode, the width modulation that the utility model realizes drives and does not produce more ineffective power consumption, efficiency is higher; And do not need to add module or the circuit for accurately controlling electric current, structure is comparatively simple; Its element used is less in addition, the basic circuit structure of not adding too much control signal wire, not changing image element circuit, is thus easy to realize.
Certainly, implement arbitrary product of the present utility model might not need to reach above-described all advantages simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, simply introduce doing one to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural drawing of a kind of image element circuit in the utility model embodiment;
Fig. 2 is the circuit diagram of a kind of preferred pixel circuit in the utility model embodiment;
Fig. 3 is the working timing figure of a kind of preferred pixel circuit in the utility model embodiment;
Fig. 4 (a) is the change curve of electric current within the frame period on the OLED in the utility model embodiment under a kind of preferred pixel circuit under high-high brightness situation;
Fig. 4 (b) is the change curve of electric current within the frame period on the OLED in the utility model embodiment under a kind of preferred pixel circuit under minimum brightness situation;
Fig. 5 is that the utility model embodiment comprises the circuit diagram that backward current prevents the image element circuit of module;
Fig. 6 is that the utility model embodiment comprises the circuit diagram that backward current prevents the image element circuit of module;
Fig. 7 is that the utility model embodiment comprises the circuit diagram that backward current prevents module section;
Fig. 8 is the sequential chart that the driving method of a kind of display panel in the utility model embodiment is corresponding.
In Fig. 1 to Fig. 8:
Scan line---sweep signal (line); Data line---voltage data signal (line);
C
stref.line---reference voltage line (or its voltage signal exported);
M1---the first on-off element; M2---second switch element; C
st---electric capacity;
OLED---luminescent device; The circuit node at the first end place of N1---luminescent device;
V
ss---low level voltage (line); Frame Period---the frame period;
C
stchr.---voltage data signal write phase; C
stdschr---the capacitor discharge stage;
T
ini---frame period, voltage data signal write phase start time; t
0---voltage data signal write phase finish time, start time in capacitor discharge stage; t
fp---capacitor discharge stage, finish time in frame period; t
1---luminescent device starts the luminous moment;
V
ini---the first voltage; V
0---the second voltage; V
t---tertiary voltage.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1
The utility model embodiment provides a kind of image element circuit, see Fig. 1, described image element circuit comprises charging module, luminescent device and electric capacity, and described charging module is connected with the first end of described electric capacity, for utilizing voltage data signal to described capacitor charging under the control of sweep signal; The first end of described luminescent device is connected with the first end of described electric capacity, and the second end of described luminescent device connects low level voltage line, for the galvanoluminescence that basis flows into from the first end of described luminescent device; Second end of described electric capacity connects reference voltage line;
In each frame period, described reference voltage line is utilizing described voltage data signal to exporting the first voltage during described capacitor charging, and the voltage signal raised gradually to tertiary voltage output from the second voltage after described charging complete terminated to this frame period; Described first voltage is less than described second voltage, and described second voltage is less than described tertiary voltage; Described reference voltage line terminates to this frame period for making the moment of described luminescent device in described voltage signal gradually elevation process start continuous illumination, and this moment is determined by the magnitude of voltage of described voltage data signal.
Wherein, Fig. 1 with luminescent device described in the symbology of a diode, the first end of the corresponding described luminescent device of its anode, the second end of the corresponding described luminescent device of its negative electrode; The corresponding first end in the upper end of electric capacity, corresponding second end in lower end in figure.
Generally, this image element circuit is divided into voltage data signal write phase and capacitor discharge stage within each frame period.In data-signal write phase, reference voltage alignment electric capacity second end exports the first voltage, charging module utilizes voltage data signal to described capacitor charging, even if electric capacity first end is voltage data signal, the other end is the first voltage, thus electric capacity is charged (stored charge is relevant with voltage data signal, namely completes its ablation process).Visible, the voltage value of the first voltage need to make the difference of the voltage on the first end voltage of luminescent device in charging process and described low level voltage line be less than luminescent device significantly luminous time required minimum, that is the magnitude of voltage of the first voltage is enough little.So, in charging process, to make that luminescent device does not have big current to pass through, the unexpected luminescence of luminescent device can not be made or harmful effect is caused to its serviceable life.
The capacitor discharge stage is entered after voltage data signal has write, now charging module no longer provides voltage to electric capacity first end, electric capacity discharges (because luminescent device second termination low level voltage when the second termination reference voltage line to luminescent device, namely the electric charge be accumulated on capacitor plate spontaneously to the flowing of this low level position, can create the electric current flowed into from luminescent device first end).Now, the voltage signal that reference voltage alignment electric capacity second end raises to tertiary voltage gradually output from the second voltage, namely raises the current potential of light-emitting component first end gradually.Certainly, due to luminescent device generally all exist cut-in voltage (namely both end voltage higher than electric current during cut-in voltage just by and make that it is luminous), so just start the situation of luminescence when the current potential that may have light-emitting component first end is elevated to a certain position.But, because electric capacity writes through voltage data signal, thus there is an initial value determined by voltage data signal (it is also relevant with capacitance certainly) in light-emitting component first end, determined so which point place in the voltage signal elevation process of luminescent device on reference voltage line starts luminescence by voltage data signal.
Thus, the magnitude of voltage of data voltage signal can the fluorescent lifetime of modulated luminescence device within each frame period (certainly starting the luminous moment to frame end), it is similar to the duty ratio modulation of square-wave signal, and the width modulation namely achieving image element circuit drives.
Wherein, pulse modulation technology specifically refers to a picture frame period (Frame Period) to be divided into multiple subframe (Sub-Frame), by driving the keying of luminescent device in pixel in each subframe, control driving pulse in a picture frame period after superposition and open overall width (Plus Width), thus realize gray-scale Control (namely carry out " 0-1 " numeral discretely to export, and the effect similar with modulating output can be produced when refreshing frequency is enough high).
Visible, make data controlling signal refreshing and drive actions frequency far above display frame frequency if need when being directly applied in image element circuit driving, the realization of circuit exists a lot of difficulty.And the utility model is with the pixel data refreshing frequency identical with frame frequency, the modulation of voltage data signal to fluorescent lifetime (signal dutyfactor) in each frame period can be realized, therefore luminescent device there will not be the situation that cut-in voltage is excessive and immediate current is excessive, namely solves the problem that working current is large, serviceable life is low of pixel light emission device.
And compared to analog-driven mode, the width modulation that the utility model realizes drives and does not produce more ineffective power consumption, efficiency is higher; And do not need to add module or the circuit for accurately controlling electric current, structure is comparatively simple; Its element used is less in addition, the basic circuit structure of not adding too much control signal wire, not changing image element circuit, is thus easy to realize.
In order to be illustrated more clearly in the technical scheme of the present embodiment, show one preferred pixel circuit more specifically below, see Fig. 2:
Preferably, described charging module comprises the first on-off element M1, the first end of described first on-off element M1 connects described voltage data signal Data line, the control end of described first on-off element M1 connects described sweep signal Scan line, second end of described first on-off element M1 and the first end of described luminescent device OLED, described electric capacity C
stfirst end be connected.That is, under the control of control end connection signal, charging module can realize connection or the disconnection of the first end of voltage data signal Data line and luminescent device OLED, thus can realize electric capacity C
stcharging.Preferably, described luminescent device is Organic Light Emitting Diode OLED.
Now, as shown in Figure 3, its detailed process is as follows for working timing figure corresponding to this circuit:
Frame period, voltage data signal write phase start time t
initime, drive completing previous frame OLED the charge storage capacitance C discharged
streference voltage line on current potential (C
stref.) the first fully low voltage V is initialised to
ini, then to be charged M1 by scan signal line gating, to make on data line (brightness or GTG) voltage data signal by M1 to C
stcharging.V
inifully low requirement is, guarantees that charging process completes the current potential V of interior joint N1
n1with the current potential V of OLED negative electrode
ssdifference can not (because of ghost effect) higher than the operating voltage V needed for the remarkable normal luminous of OLED
op, i.e. V
n1-V
ss<V
op.Therefore in charging process, pixel OLED does not have super-high-current to pass through, and can not cause damage to the OLED life-span.
Voltage data signal write phase finish time, capacitor discharge stage start time t
0time, after charging complete, control charge storage capacitance C
streference potential (C
stref.) saltus step to the second voltage V
0, make under this current potential, by the C of maximum brightness signal charging
ststart with suitable electric discharge drive current I
dscjrpixel OLED is discharged.Subsequently, reference potential improves constantly, and maintains C
stthe electric discharge drive current suitable to pixel OLED, until the frame period terminate (t
fptime point).At the end of frame period, C
streference potential terminal potential also reaches the highest tertiary voltage V
t, electric discharge terminates.
For the C by less brightness data voltage charging
st, at electric capacity reference edge current potential from V
0when starting to rise, because N1 point current potential is still lower, pixel OLED can not be significantly luminous, until because of the current potential rising on reference voltage line, and potential difference (PD) (V between node N1 and OLED negative electrode
n1-V
ss) higher than V
optime (t
1time point), pixel OLED starts to terminate to the frame period with suitable galvanoluminescence.
Because fluorescent lifetime difference in the frame period, display brightness is different, realizes gray scale display; And luminous moment t
1be positioned at t
0to t
fpbetween which point write C by voltage data signal
stthe quantity of electric charge determine, and the quantity of electric charge is by the magnitude of voltage of voltage data signal and electric capacity C
stcapacitance determine.Fig. 4 (a) and Fig. 4 (b) is the schematic diagram being realized gray shade scale control under this circuit by width modulation, shows the change OLED after the voltage data signal write of corresponding high-high brightness and minimum brightness flowing through electric current respectively.
Hypothesis completes the situation of charging with the voltage data signal of corresponding high-high brightness in Fig. 4 (a), if now N1 Nodes current potential V
n1=V
max; V
maxmeet:
V
max＝V
op+V
ss-(V
0-V
ini)
Then work as V
inisaltus step is to current potential V
0time, node N1 current potential V
n1reach V
op+ V
ss, charge storage capacitance C
ststart with electric current I
dschrelectric discharge, OLED luminescence.I
dschrsize by C
stcapacity and V
refvariation speed determines.But for maintaining normal luminosity, I
dschrthe also requirement of demand fulfillment pixel OLED I-V characteristic, namely at operating voltage V
oplower certain electric current I
oled:
According to above formula, C can be set
stsuitable electric capacity and electric capacity benchmark regulation of line voltage (V
t-V
0).
Hypothesis completes the situation of charging with the voltage data signal of corresponding high-high brightness in Fig. 4 (b), if now N1 Nodes current potential V
n1=V
min; V
minmeet:
V
min＝V
op+V
ss-(V
t-V
ini)
When charging is complete, node N1 current potential is lower than V
mintime, whole frame period interior nodes N1 and OLED cathodic electricity potential difference all can not higher than pixel OLED normal working voltage V
op, owing to not having enough large electric current to flow through all the time, pixel OLED is not luminous, shows pixel darkly.
Marginal situation, when charging complete posterior nodal point N1 current potential is less than V
maxand be greater than V
mintime, then on pixel OLED, current potential reaches V
optime to be later than t
0and early than t
fp.Because in the frame period, pixel OLED fluorescent lifetime shortens, visual brightness can be less than maximum brightness, realizes gray scale display (or only in the luminescence of moment finish time in frame period, it can regard as not luminous equally).
Certainly, above-mentioned preferred image element circuit is only a kind of embodiment, those skilled in the art can make as adopted other kind luminescent devices, replacing charging module internal structure, replacing with reference to upper example setting magnitude of voltage everywhere etc. is equal according to practical situations, and it does not obviously depart from the spirit and scope of the utility model embodiment technical scheme.
In addition, preferably, described image element circuit also comprises backward current and prevents module, in the connection utilizing described voltage data signal to the second end and described low level voltage line that disconnect described luminescent device during described capacitor charging.The electric current excessive situation causing damaging when considering that luminescent device may exist reverse conducting, for preventing at electric capacity C
stcaused the damage of luminescent device, improper luminescence by during charging because the reduction of node N1 current potential causes luminescent device place to produce backward current or affect the situations such as data-signal charging accuracy, backward current preventing circuit can be set on demand, break the second end of described luminescent device and the connection of described low level voltage line in above-mentioned voltage data signal write phase.
It is one of preferred embodiment see Fig. 5, and described backward current prevents module from being with the part of dotted line collimation mark note.Now described backward current prevents module from comprising second switch element M2, and the first end of described second switch element M2 is connected with second end of described luminescent device OLED, and second end of described second switch element M2 connects low level voltage line V
sS.That is, the second end and the low level voltage line V of luminescent device OLED is separated by an on-off element
sSconnection, and utilize on-off element realize to its connect or disconnect control.
Preferably, arbitrary described on-off element is n channel type thin-film transistor or p channel type thin-film transistor.Realized the function of above-mentioned on-off element by thin film transistor (TFT) TFT, can adapt with the formation process of existing image element circuit, and there is the many-sided advantage of thin film transistor (TFT) self.Only for p channel type thin-film transistor in accompanying drawing, the drain electrode of the source electrode of the corresponding TFT of first end of on-off element, the grid of the corresponding TFT of control end, the corresponding TFT of the second end.Certainly, due to the level height difference making n channel type thin-film transistor or p channel type thin-film transistor be in opening, so need the level of signal height to exchange when doing equal replacement, namely the polarity of Timing driver signal is adjusted accordingly.
Preferably, described first on-off element is p channel type thin-film transistor, and described second switch element is n channel type thin-film transistor, or described first on-off element is n channel type thin-film transistor, and described second switch element is p channel type thin-film transistor; The control end of described second switch element connects described sweep signal.In this case, the control of same scan signal line realization to two on-off elements can be used, can simple implementation circuit.
In like manner, described first on-off element and described second switch element can be made to be all n channel type thin-film transistor or p channel type thin-film transistor; The control end of described second switch element connects the inversion signal of described sweep signal.Under such circumstances, directly get the inversion signal of sweep signal to control M2, equally can the simplification of realizing circuit.
Above two kinds of optimal ways are all that to take into account the on off state of M1 and M2 contrary, and can adopt the embodiment sharing Timing driver signal in cmos circuit, wherein a kind of examples of circuits of embodiment is see Fig. 6.
In addition, also backward current as shown in Figure 7 can be adopted to prevent module, for LTPS (Low Temperature Poly-silicon, low temperature polycrystalline silicon) technology, usually enhancement mode p channel-type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor is formed under basic technology, metal-oxide layer semiconductcor field effect transistor) prevent module as backward current here, mainly TFT is in this characteristic of cut-off state when gate source voltage is 0V.In circuit shown in Fig. 7, when second end of OLED is at the first time instances t
inibe in lower than V
sslow level current potential time, M2 and V
ssthe one end be connected is source electrode, and now the gate source voltage of M2 equals 0V, and TFT ends, and can prevent the generation of backward current, shield to OLED.But when second terminal potential of OLED raises with the rising of Cst ref.line current potential, and be significantly higher than V
sstime, then one end that M2 and OLED is connected is source electrode, and now gate source voltage is less than 0V, then M2 enters conducting state, can make driving current through of OLED.
Embodiment 2
Based on the design of same utility model, a kind of display panel of the utility model embodiment, it comprises array base palte and/or color membrane substrates, and the pixel cell on described array base palte and/or color membrane substrates adopts a kind of image element circuit as described in example 1 above.This display device can be: any product or parts with Presentation Function such as AMOLED panel, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
The transparent display provided due to the utility model embodiment has identical technical characteristic with any one image element circuit that embodiment 1 provides, so also can solve same technical matters, produces identical technique effect.
Embodiment 3
For the display panel described in embodiment 2, propose a kind of driving method of display panel here accordingly, see Fig. 8, in the frame period (Frame period) of each pixel of this display panel, comprise the first moment t from front to back
ini, the second moment t
0with the 3rd moment t
fp, the described 3rd moment t in each frame period
fpwith the described first moment t in next frame cycle
inioverlap; This driving method comprises:
Described first moment t
ini, described sweep signal Scan line transfers second electrical level to by the first level, described reference voltage line C
stref.line exports described first voltage V
ini;
Described second moment t
0, described sweep signal Scan line transfers the first level to by second electrical level, described reference voltage line C
stref.line exports described second voltage V
0;
Described 3rd moment t
fp, described sweep signal Scan line transfers second electrical level to by the first level, described reference voltage line C
stthe output of ref.line is by described tertiary voltage V
ttransfer described first voltage V to
ini;
Described second moment t
0with described 3rd moment t
fpbetween, described reference voltage line C
stthe voltage that ref.line exports raises gradually;
Described first level and second electrical level are respectively the one in high level and low level.
Wherein, corresponding to n channel-type TFT and p channel-type TFT, described first level and described second electrical level are respectively the one in high level and low level, specifically can design with reference to embodiment 1.
This driving method corresponds to the display panel that the image element circuit that proposes of embodiment 1 and embodiment 2 propose, and when specifically carrying out the use of image element circuit or display panel, can use the method that the utility model embodiment proposes.
In sum, the utility model mainly utilizes the charge and discharge process of electric capacity, with electric capacity one end the change in voltage connect on reference voltage line light-emitting component continuous illumination from a moment in the frame period was terminated to this frame period, and this time the position be engraved in this frame period determine according to voltage data signal.That is, image element circuit can determine the fluorescent lifetime length of wherein luminescent device in each frame period according to the size of voltage data signal, namely achieves image element circuit and drives for the width modulation of brightness.Simultaneously, now image element circuit does not need high-frequency Refresh Data, the frequency of Refresh Data is identical with frame frequency, and thus luminescent device there will not be the situation that cut-in voltage is excessive and immediate current is excessive, namely solves the problem that working current is large, serviceable life is low of pixel light emission device.
And compared to analog-driven mode, the width modulation that the utility model realizes drives and does not produce more ineffective power consumption, efficiency is higher; And do not need to add module or the circuit for accurately controlling electric current, structure is comparatively simple; Its element used is less in addition, the basic circuit structure of not adding too much control signal wire, not changing image element circuit, is thus easy to realize
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the article of a series of key element or equipment not only comprises those key elements, but also comprise other key elements clearly do not listed, or also comprise by this article or the intrinsic key element of equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within the article or equipment comprising described key element and also there is other identical element.
Above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (9)
1. an image element circuit, is characterized in that, described image element circuit comprises charging module, luminescent device and electric capacity,
Described charging module is connected with the first end of described electric capacity, for utilizing voltage data signal to described capacitor charging under the control of sweep signal;
The first end of described luminescent device is connected with the first end of described electric capacity, and the second end of described luminescent device connects low level voltage line, for the galvanoluminescence that basis flows into from the first end of described luminescent device;
Second end of described electric capacity connects reference voltage line;
In each frame period, described reference voltage line is utilizing described voltage data signal to exporting the first voltage during described capacitor charging, and the voltage signal raised gradually to tertiary voltage output from the second voltage after described charging complete terminated to this frame period; Described first voltage is less than described second voltage, and described second voltage is less than described tertiary voltage;
Described reference voltage line terminates to this frame period for making the moment of described luminescent device in described voltage signal gradually elevation process start continuous illumination, and this moment is determined by the magnitude of voltage of described voltage data signal.
2. image element circuit according to claim 1, it is characterized in that, described charging module comprises the first on-off element, the first end of described first on-off element connects described voltage data signal, the control end of described first on-off element connects described sweep signal, and the second end of described first on-off element is connected with the first end of the first end of described luminescent device, described electric capacity.
3. image element circuit according to claim 2, it is characterized in that, described image element circuit also comprises backward current and prevents module, in the connection utilizing described voltage data signal to the second end and described low level voltage line that disconnect described luminescent device during described capacitor charging.
4. image element circuit according to claim 3, it is characterized in that, described backward current prevents module from comprising second switch element, and the first end of described second switch element is connected with the second end of described luminescent device, and the second end of described second switch element connects low level voltage line.
5. image element circuit as claimed in any of claims 2 to 4, is characterized in that, arbitrary described on-off element is n channel type thin-film transistor or p channel type thin-film transistor.
6. image element circuit according to claim 4, is characterized in that, described first on-off element is p channel type thin-film transistor, and described second switch element is n channel type thin-film transistor,
Or,
Described first on-off element is n channel type thin-film transistor, and described second switch element is p channel type thin-film transistor;
The control end of described second switch element connects described sweep signal.
7. image element circuit according to claim 4, is characterized in that, described first on-off element and described second switch element are all n channel type thin-film transistor or p channel type thin-film transistor;
The control end of described second switch element connects the inversion signal of described sweep signal.
8. according to the image element circuit in claim 1-4,6-7 described in any one, it is characterized in that, described luminescent device is Organic Light Emitting Diode.
9. a display panel, comprises array base palte and/or color membrane substrates, it is characterized in that, the pixel cell on described array base palte and/or color membrane substrates adopts as the image element circuit in claim 1-8 as described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420677581.8U CN204117567U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit and display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420677581.8U CN204117567U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit and display panel |
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| CN204117567U true CN204117567U (en) | 2015-01-21 |
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| CN201420677581.8U Withdrawn - After Issue CN204117567U (en) | 2014-11-13 | 2014-11-13 | A kind of image element circuit and display panel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104299573A (en) * | 2014-11-13 | 2015-01-21 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and driving method thereof |
| CN108986749A (en) * | 2017-06-05 | 2018-12-11 | 京东方科技集团股份有限公司 | Pixel unit and driving method, display panel and display methods, display device |
| CN109003592A (en) * | 2018-08-01 | 2018-12-14 | 福建华佳彩有限公司 | A method of the adjustment transparent susceptibility of transparent display |
-
2014
- 2014-11-13 CN CN201420677581.8U patent/CN204117567U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104299573A (en) * | 2014-11-13 | 2015-01-21 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and driving method thereof |
| WO2016074356A1 (en) * | 2014-11-13 | 2016-05-19 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and driving method thereof |
| CN104299573B (en) * | 2014-11-13 | 2016-06-29 | 京东方科技集团股份有限公司 | A kind of image element circuit, display floater and driving method thereof |
| US9799269B2 (en) | 2014-11-13 | 2017-10-24 | Boe Technology Group Co., Ltd. | Pixel circuit, display panel and driving method thereof |
| CN108986749A (en) * | 2017-06-05 | 2018-12-11 | 京东方科技集团股份有限公司 | Pixel unit and driving method, display panel and display methods, display device |
| CN109003592A (en) * | 2018-08-01 | 2018-12-14 | 福建华佳彩有限公司 | A method of the adjustment transparent susceptibility of transparent display |
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