CN101996576A - Display device - Google Patents

Abstract

A display device includes several pixels, each of which has a light-emitting unit, a memory circuit and a drive circuit. The memory circuit memorizes an image data, the drive circuit is coupled to the light-emitting unit and the memory circuit and drives the light-emitting unit based on the image data. In the display device, a data line does not need to receive image data continuously to keep the image data in the memory circuit. In this way, a data drive does not need to memorize pixel data continuously and write the pixel data to the corresponding pixel, and an additional electric power does not need to be provided to the data drive, such that power consumption can be reduced. Said drive mode is especially beneficial to a dark display condition.

Description

Display device

Technical field

The present invention is about a kind of display device, especially in regard to a kind of Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) display device.

Background technology

In recent years, Organic Light Emitting Diode (OLED) reaches the low many advantages of cost easily because of having high brightness, full-colorization, wide viewing angle, autoluminescence, high answer speed, deflection, processing procedure, also meets the characteristic demand of flat display apparatus than lcd technology.

Fig. 1 is the synoptic diagram of the image element circuit of known organic LED display device.Please refer to shown in Figure 1ly,image element circuit 10 is connected with staggered sweep trace S and the data line D that is matrix, and has a n type thin film transistor (TFT) 11, a p type thin film transistor (TFT) 12, acapacitor 13 and an Organic Light Emitting Diode 14.Wherein, the gate of n type thin film transistor (TFT) 11 is connected with sweep trace S, and drain is connected with data line D, and source electrode then is connected with p type thin film transistor (TFT) 12 and capacitor 13.Therefore, in the picture frame time (frame time), when sweep trace S output scanning signal was opened n type thin film transistor (TFT) 11, image data inputed tocapacitor 13 by data line D through n type thin film transistor (TFT) 11, and p type thin film transistor (TFT) 12 is to cut out at this moment.Then, n type thin film transistor (TFT) 11 cuts out, and p type thin film transistor (TFT) 12 can be opened according to stored image data in thecapacitor 13, so that shinny from the current drives Organic Light Emitting Diode 14 of power supply Vdd input.

Storer 15 stores the image data that should write toimage element circuit 10, andgate pole driver 16 controlimage element circuits 10 receive image data fromsource electrode driver 17, makesource electrode driver 17 that the image data that storer 15 stores is write toimage element circuit 10.

With the resolution of QVGA, the pixel that always has 320 row is connected with data line D.And the aanalogvoltage of corresponding image data can be orderly sent to each pixel by data line D.Before time, each pixel must be kept the brightness of the accurate position of aanalogvoltage of corresponding input at next picture frame.Because each pixel intensity is the function of the gate voltage of p type thin film transistor (TFT) 12, so the gate voltage of p type thin film transistor (TFT) 12 must be kept fixing in the picture frame time (about 16.6 microseconds) bycapacitor 13.

Yet, no matter be n type thin film transistor (TFT) 11 or p type thin film transistor (TFT) 12, the problem of leakage current (leakage current) is arranged all, thereby can consume the electric flux that is stored in thecapacitor 13, and cause the voltage quasi position of image data to change.After after a while (for example: greater than the picture frame time), the gate voltage of p type thin film transistor (TFT) 12 promptly can't be kept.So, also may cause p type thin film transistor (TFT) 12 to open or to close according to correct image data in the time at a picture frame, unless supply new image data, but so also can increase the power consumption of organic LED display device.

Summary of the invention

The display device that the purpose of this invention is to provide a kind of low-power consumption.

The present invention can realize by the following technical solutions.

Comprise a plurality of pixels according to a kind of display device of the present invention, each pixel has a luminescence unit, a memory circuit and one drive circuit.Memory circuit stores an image data, and driving circuit and luminescence unit and memory circuit couple, and according to image data driven for emitting lights unit.

In one embodiment, described luminescence unit is an Organic Light Emitting Diode.

In one embodiment, described memory circuit is a static RAM or can be with the capacitor of digital form storage data.

In one embodiment, described pixel also comprises a mode switch circuit, couple with a described memory circuit and a pattern control line, control described driving circuit according to being stored in the described image data of described memory circuit with a general mode or the described luminescence unit of an in-pixel memory mode activated.

In one embodiment, described mode switch circuit comprises enables a switch and a back coupling switch, enable switch and described driving circuit and described memory circuit and couple, control described driving circuit according to being stored in the described image data of described memory circuit with described general mode or the described luminescence unit of described in-pixel memory mode activated; Feedback switch and describedly enable switch and described luminescence unit couples, when described luminescence unit is luminous, described back coupling switch open and connect a described switch and the bias voltage lead enabled.

In one embodiment, described display device also comprises a plurality of sweep traces and a plurality of data line, and described sweep trace couples with described pixel respectively, and described data line couples with described pixel respectively.

In one embodiment, each pixel also comprises an on-off circuit, its couple described memory circuit, described sweep trace one of them, and described data line one of them, wherein under described general mode, described sweep trace output one scan signal is opened described on-off circuit, and described data line writes described image data to described memory circuit.

In one embodiment, the leakage current of described on-off circuit is greater than the leakage current of described mode switch circuit, and the image data that makes described memory circuit store utilizes described uneven leakage current to keep.

In one embodiment, in described in-pixel memory pattern, a high voltage level provides to described data line, and does not have sweep signal to provide to described sweep trace.

In one embodiment, described image display system also comprises a display device, has an organic electroluminescence assembly.

By technique scheme, display device of the present invention has following advantage at least:

In display device of the present invention, each pixel can have a memory circuit, with in picture frame memory image data in the time.Therefore, do not need to receive by data line constantly the characteristic of image data, can keep the image data in the memory circuit.Thus, source electrode driver need not store pixel data constantly and it is write to respective pixel, and making does not need to provide additional power to source electrode driver in the case, thereby can reduce power consumption.This type of drive demonstration situation to slightly dark especially is useful.

Moreover, display device of the present invention can comprise that also the mode switch circuit switches general mode or in-pixel memory pattern, and therefore, display device can utilize above-mentioned low-power consumption to drive, perhaps utilize traditional type of drive, also can increase range of application of the present invention whereby.

Description of drawings

Fig. 1 is the synoptic diagram of the image element circuit of known organic LED display device;

Fig. 2 is the calcspar of circuit of the display device of one embodiment of the invention;

Fig. 3 A and Fig. 3 B are the synoptic diagram of circuit of each pixel of display device of one embodiment of the invention;

Fig. 4 A is that curve synoptic diagram is represented in the power consumption of known display device of not having a memory circuit;

Fig. 4 B is that curve synoptic diagram is represented in the power consumption that present embodiment has a display device of memory circuit;

Fig. 5 is the synoptic diagram of circuit of each pixel of display device of one embodiment of the invention;

Fig. 6 is the calcspar of circuit of the display device of another embodiment of the present invention;

Fig. 7 is the synoptic diagram of circuit of each pixel of display device of Fig. 6; And

Fig. 8 to Figure 11 is the synoptic diagram in circuit when running of Fig. 7.

The main element symbol description:

10: image element circuit

11:n type thin film transistor (TFT)

12:p type thin film transistor (TFT)

13: capacitor

14: Organic Light Emitting Diode

15: storer

16: gate pole driver

17: source electrode driver

2,3: display device

20,20a, 30: pixel

21,31: luminescence unit

22,22a, 226～229,32: memory circuit

221,321: image data

222,224,225: transistor

223: impedance

23,23a, 33: driving circuit

231,331: transistor

24,24a, 34: on-off circuit

241,341: transistor

322: capacitor

35: the mode switch circuit

351: enable switch

352: the back coupling switch

41: gate pole driver

42: source electrode driver

C: pattern control line

D: data line

L: bias voltage lead

N: node

P: pixel

S: sweep trace

S1: scanning signal

Vdd, Vss: power supply

Embodiment

Hereinafter with reference to correlative type, a kind of display device of the preferred embodiment of the present invention is described.

Fig. 2 is the calcspar of circuit of the display device of one embodiment of the invention.Please refer to shown in Figure 2ly, adisplay device 2 comprises a plurality ofpixels 20, and eachpixel 20 has aluminescence unit 21, amemory circuit 22 and onedrive circuit 23.

Memory circuit 22 stores animage data 221, drivingcircuit 23 andluminescence unit 21 andmemory circuit 22 couples and according toimage data 221 driven for emittinglights unit 21.

Pixel 20 is arranged in matrix, and for instance, threepixels 20 can constitute a pixel cell jointly.Yetpixel 20 also can be arranged in polygon or other shape, and constituting the required pixel quantity of pixel cell also can be different.The arrangement mode ofpixel 20 for example is vertical bar (stripe) arrangement or mosaic (mosaic) arrangement etc.

Luminescence unit 21 for example is an Organic Light Emitting Diode, anddisplay device 2 is an organic LED display device at this embodiment.Organic Light Emitting Diode for example can be ruddiness Organic Light Emitting Diode, green glow Organic Light Emitting Diode, blue light Organic Light Emitting Diode, gold-tinted Organic Light Emitting Diode or white organic LED, is not limited at this.That is to say that display device has organic electroluminescence assembly.

Memory circuit 22 can be by the realizing like static RAM (SRAM-like) of Fig. 3 A or Fig. 3 B, so as to the logic state oflatch stores circuit 22, and the similar static RAM of capable As (SRAM) of memory circuit 22.As shown in Figure 3A, for instance,memory circuit 22 has atransistor 222 and animpedance 223, and when on-off circuit 24 cut out,transistor 222 andimpedance 223 can be latched the logic state of (latch) memory circuit 22.Shown in Fig. 3 B, memory circuit 22a has two reversers, be used for when on-off circuit 24 cuts out can latchstores circuit 22 logic state, each reverser has two-transistor 224,225.The details of Fig. 3 A and Fig. 3 B will be in subsequent descriptions.

Shown in Fig. 2 and Fig. 3 A, drivingcircuit 23 has atransistor 231, and it can be p type thin film transistor (TFT) or n type thin film transistor (TFT).

In the present embodiment, eachpixel 20 comprises that also an on-off circuit 24 andmemory circuit 22 couple, and in addition, on-off circuit 24 is coupled to wherein a sweep trace S and data line D wherein respectively.

Display device 2 also comprises a plurality of sweep trace S and data line D that couple withpixel 20 respectively.Onegate pole driver 41 writes the sequential of data topixel 20 in order to see through sweep trace S control, and onesource pole driver 42 writes topixel 20 in order to see through data line D withimage data 221.

On-off circuit 24control store circuit 22 are written into image data termly, and for instance, when on-off circuit 24 was opened according to the control ofgate pole driver 41,source electrode driver 42 saw through data lineD image data 221 is write tomemory circuit 22.

Below, please refer to shown in Fig. 3 A, with the running of pixel of explanation present embodiment.Fig. 3 A is the synoptic diagram of the circuit of eachpixel 20 in thedisplay device 2 of presentembodiment.Luminescence unit 21 can be an Organic Light Emitting Diode, anddisplay device 2 is organic LED display devices.Be noted that in Fig. 3 A, As can clearly demonstrate, and only represents the driving circuit of a pixel, so it is non-in order to restriction the present invention.In addition, be not that memory circuit comprises a transistor 222 (for example n type thin film transistor (TFT)) and animpedance 223 in order to qualification for instance.

Therefore, at a picture frame in the time, when the one scan signal S1 on the sweep trace S opens thetransistor 241 of on-off circuit 24,image data 221 inputs to storage in thememory circuit 22 by thetransistor 241 of data line D process on-off circuit 24, then, the opening degree of thetransistor 231 of storedimage data 221control Driver Circuit 23 in thememory circuit 22, and then control the electric current that inputs toluminescence unit 21 from power supply Vdd, with the luminous degree ofcontrol luminescence unit 21.

Because as the known organic LED display device of Fig. 1 must haveexternal memory storage 15 to store the data of each pixel, andsource electrode driver 17 must regularly export these data to pixel through data line.Compare down, because eachpixel 20 of the display device of present embodiment hasmemory circuit 22, therefore, 22 needs of memory circuit refresh (refresh), and do not need to receiveimage data 221 by data line D constantly.In other words, just the mechanism that can utilizememory circuit 22 to refresh can keep the image data in the memory circuit 22.Thus, source electrode driver need not store pixel data constantly and it is write to respective pixel, and making does not need to provide additional power to source electrode driver thereby can reduce power consumption in the case.

Be noted thatmemory circuit 22 also can have different designs, for example, shown in Fig. 3 B, memory circuit 22a is made of two reversers, and each reverser comprises a p type thin film transistor (TFT) 224 and a n type thin film transistor (TFT) 225, and so it is non-limiting.In this special instruction is that reverser has certain driving force, so drivingcircuit 23 can be incorporated into the reverser of memory circuit 22a.

Fig. 4 A is the synoptic diagram that curve is represented in the power consumption of known organic LED display device of not having a storer, and Fig. 4 B is a synoptic diagram of representing curve as the power consumption that has thedisplay device 2 of memory circuit among present embodiment Fig. 3 A.Among Fig. 4 A and Fig. 4 B, X-axis is represented the sweep trace quantity of display device, and Y-axis is represented power consumption, and wherein solid line is represented whole power consumptions of luminescence unit, and dotted line is represented the power consumption of drive integrated circult (IC).

Shown in Fig. 4 A, known source electrode driver must constantly write data to pixel, when the sweep trace of display device is got over for a long time, the power consumption of source electrode driver increases because of source electrode driver must transmit more image datas to the pixel of different scanning line, and, when display device only during some show image or during the display device deepening, source electrode driver still can not stop, and its access memory continually still, therefore, the power of source electrode driver accounts for the total power consumption ofmost display device 2.

Compared to Fig. 4 A, shown in Fig. 4 B,, make the picture of image be maintained becausepixel 20 hasmemory circuit 22 and stores image data.Therefore,source electrode driver 42 does not need to provide constantly image data topixel 20, andsource electrode driver 42 can stop to provide image data topixel 20, makes to get over for a long time when the sweep trace ofdisplay device 2, and power consumption can not increase.

By Fig. 4 A and Fig. 4 B as can be known, in thedisplay device 2 of present embodiment, the power consumption of drive integrated circult can not increase along with the size ofdisplay device 2 and increase, and the power consumption of whole display device is also more known low.

In the present embodiment,memory circuit 22 is to set the storage image data for, makes that the image data that provides additional power to source electrode driver to store topixel 20 is inessential.Therefore, the power consumption ofdisplay device 2 can further reduce.

Yet, as thememory circuit 22 of Fig. 3 A or Fig. 3 B, the data that 22a only can remember 1 (bit), therefore, in order to increase the capacity of storage data, eachpixel 20a as Fig. 5 has a plurality ofmemory circuits 226～229, drivingcircuit 23a has a plurality oftransistors 231, and on-off circuit 24a has a plurality oftransistors 241, andtransistor 231 andtransistor 241 couple withcorresponding memory circuit 226～229 respectively.Whereby, can make the OrganicLight Emitting Diode 21 of eachpixel 20a can produce different gray scale variation.

For instance,memory circuit 226～229 can be represented not coordination respectively, and for example:memory circuit 226 tomemory circuit 229 represents leftmost bit to rightmost position.Eachtransistor 231 can be designed to have different driving forces, and corresponding to, thetransistor 231 of position, a left side has stronger driving force.Wherein, the driving force oftransistor 231 is anti-relevant with the equivalence group oftransistor 231.

Please refer to shown in Figure 6ly, it is the calcspar of circuit of the display device 3 of another embodiment of the present invention.Display device 3 comprises a plurality of sweep trace S, data line D, pattern control line C, power lead (figure does not show) and a plurality ofpixel 30, and eachpixel 30 has aluminescence unit 31, amemory circuit 32, onedrive circuit 33 and amode switch circuit 35.

Memory circuit 32 stores animage data 321, and drivingcircuit 33 couples with OrganicLight Emitting Diode 31 andmemory circuit 32, and according toimage data 321 driven for emittinglights unit 31.

Thepixel 20 of the arrangement ofpixel 30 and variation and previous embodiment is similar, and theluminescence unit 21 of the kind ofluminescence unit 31 and variation and previous embodiment is similar, so repeat no more.

Data line D respectively with the staggered homeotropic alignment of sweep trace S, and couple withpixel 30 respectively, pattern control line C be arranged in parallel with sweep trace S.

In the present embodiment,memory circuit 32 can be described volatility of embodiment or non-volatile memory circuit as described above, and in addition,memory circuit 32 is discrete component, and the value of its storage is a digital form.In addition,memory circuit 32 also can be that comprise can be with the capacitor of digital form storage data, and capacitor is the data that can present its record with figure pattern or simulation model.

Mode switch circuit 35 couples withmemory circuit 32, and it is subjected to the control of pattern control line C, and then (Memory-In-Pixel Mode MIPMode) operates with the in-pixel memory pattern to enable pixel 30.Mode switch circuit 35 couples withmemory circuit 32 and drivingcircuit 33 andcontrol store circuit 32 presents the data of storage with figure pattern or simulation model, and drivingcircuit 33 is according to theimage data 321 driven for emittinglights unit 31 ofmemory circuit 32.

Below, please refer to Fig. 7 to shown in Figure 11, with the running of thepixel 30 of explanation present embodiment.Fig. 7 is the synoptic diagram of present embodiment circuit of each pixel of display device 3 in Fig. 6.Be noted that, in Fig. 7, for clearly demonstrating, only represent the circuit of a pixel, so it is non-in order to restriction the present invention.And in the present embodiment, having acapacitor 322 withmemory circuit 32 is example, andmode switch circuit 35 has the switch of enabling 351 and backcoupling switch 352 is example, and so it is non-in order to restriction the present invention.

As shown in Figure 7, enablingswitch 351 and drivingcircuit 33 andmemory circuit 32 couples withcontrol Driver Circuit 33 according to the image data ofmemory circuit 32 with general mode or in-pixel memory mode activated luminescence unit 31.Feedback switch 352 with enableswitch 351 andluminescence unit 31couples.Luminescence unit 31 has negative electrode and anode, and the drain of the gate of the negative electrode ofluminescence unit 31 and backcoupling switch 352 and thetransistor 331 of drivingcircuit 33 couples.The anode ofluminescence unit 31 and a power lead (power supply Vss) couple.

Thetransistor 331 of drivingcircuit 33 is p type thin film transistor (TFT)s, the source electrode oftransistor 331 is connected to a power lead (power supply Vdd), wherein power lead extends along the respective column ofpixel 30, and the drain of an end of the gate oftransistor 331 and thecapacitor 322 ofmemory circuit 32, thetransistor 341 of on-off circuit 34 and the drain of enablingswitch 351 are connected.In this example, the other end ofcapacitor 322 is connected with power lead (power supply Vdd).

Transistor 341 is n type thin film transistor (TFT)s, and the source electrode oftransistor 341 and corresponding data line D couple, and the gate oftransistor 341 and sweep trace S couple.Wherein sweep trace S extends along the row ofpixel 30 correspondences.

Enablingswitch 351 is n type thin film transistor (TFT)s, and the gate and the pattern control line C that enableswitch 351 couple, and wherein pattern control line C extends along the respective column of pixel 30.Enabling the drain ofswitch 351 and the drain ofback coupling switch 352 couples.

Back couplingswitch 352 is n type thin film transistor (TFT)s, and the source electrode and a bias voltage lead L ofback coupling switch 352 couple, and wherein bias voltage lead L extends along the corresponding row of pixel 30.For instance, the bias voltage lead is a low potential lead.

If enablingswitch 351 closes, theimage data 321 that capacitor 322 stores can be understood with analog form, and the voltage level ofimage data 321 is controlled the size of current of thetransistor 331 of flowing through; Open if enableswitch 351,capacitor 322 stored image datas 321 can be understood with digital form, and this is the in-pixel memory pattern, and it is low-power consumption mode that this operating mode can be used as.

As shown in Figure 8, under general mode,memory circuit 32 is written intoimage data 321 termly, andmemory circuit 32 presents the data of storage with simulation model, and drivingcircuit 33 is according toimage data 321 driven for emittinglights unit 31.

When enablingswitch 351 and close,pixel 30 runnings are at general mode.On-off circuit 34control store circuit 32 are written intoimage data 321 termly.In time, sweep trace S output one scan signal S1 comes turn-ontransistor 341, makesimage data 321 input tocapacitor 322 by data line D throughtransistor 341 at a picture frame.Afterpixel 30 has been scanned line S scanning,transistor 341 is closed, the voltage level ofcapacitor 322 is controlled the size of current of thetransistor 331 of flowing through, and the currentdrives luminescence unit 31 of thetransistor 331 of flowing through is luminous, and then makes the luminosity ofluminescence unit 31 reach desired destination.

Please refer to Fig. 9 and shown in Figure 10, when enablingswitch 351 unlatchings,pixel 30 runnings are in the in-pixel memory pattern.Under this pattern, do not scan signal on the sweep trace S and maketransistor 341 close.

Under the in-pixel memory pattern, theimage data 321 thatmemory circuit 32 stores is to utilize uneven leakage current to keep.For instance, take place uneven leakage current be because the leakage current of on-off circuit 34 greater than the leakage current of mode switch circuit 35.Uneven leakage current as shown in figure 10, because the leakage current oftransistor 341 and backcoupling switch 352 depends on the gate voltage at them, therefore, oxide-semiconductor control transistors 341 and enableswitch 351 and feedback the transistorized gate voltage ofswitch 352 and just can control these transistorized leakage currents effectively, so, can be greater than via enablingswitch 351 and feedbacking the transistorized leakage current ofswitch 352 via the leakage current oftransistor 341, the data that make the leakage current ofmemory circuit 32 be compensated and store are maintained.

Memory circuit 32 stores the image data that utilizes uneven leakage current to keep, and presents the data of storage with figure pattern, and drivingcircuit 33 is according to image data driven for emittinglights unit 31.

If node N is in high levels, drivingcircuit 33 close andluminescence unit 31 not luminous, therefore, feedback that the transistor ofswitch 352 is closed and feedback path also is not activated, via the leakage current of on-off circuit 34 greater than keeping image data via enablingswitch 351 and feedbacking the transistorized leakage current of switch 352.In this example, node N can maintain high levels, and then guarantees that drivingcircuit 33 is in closed condition, makesluminescence unit 31 still not luminous.

Can not see through transistor in order to ensure the electric charge that is stored incapacitor 322 and release, data line D can remain on high voltage level.Since the leakage current viatransistor 341 is higher than the transistorized leakage current of enablingswitch 351 andfeedbacking switch 352, make the voltage of node N can become high levels or maintain high levels.Can guarantee so not open feedback path in high voltage level the time, make voltage still can keep as node N.

In addition, as shown in figure 11, under the in-pixel memory pattern, N is in low level when node, and drivingtransistors 331 is opened, in order to do the currentdrives luminescence unit 31 that makes through driving circuit 33.When luminescenceunit 31 is luminous,feedback switch 352 to open,memory circuit 32 is seen through enableswitch 351 and feedbacks switch 352 to be connected to bias voltage lead L.Bias voltage lead L can be the extra lead (as Fig. 7 to Fig. 9) that is provided with, or is connected to the lead of luminescence unit 31.In another embodiment, bias voltage lead L can integrate with power lead Vss.In this example, the transistorized gate voltage ofback coupling switch 352 is the forward drop ofluminescence unit 31 approximately, makes the transistor ofback coupling switch 352 open, thereby has started feedback path, and make node N still be in low level, luminescence unit is kept luminous.

In other words,pixel 30 has two kinds of display modes and is: first pattern and second pattern.

First pattern is a general modfel, and under this pattern, simulated data writes to thecapacitor 322 ofpixel 30 as way in the past, the flow through electric current ofluminescence unit 31 of the accurate and control in the aanalogvoltage position that drivingtransistors 331 stores according tocapacitor 322.

Second pattern is the in-pixel memory pattern, and under this pattern, thememory circuit 32 of pixel can be isolated with sweep trace, and the data ofmemory circuit 32 can not changed or write again.Under second pattern, gate pole driver can the output scanning signal to pixel 30.This type of drive is especially to useful in slightly dark demonstration situation.

Under this pattern,luminescence unit 31 can present the brightness of gray scale variation.In addition, no matter whetherluminescence unit 31 is luminous, backcoupling switch 352 is adiaphorous.

In sum, in display device of the present invention, each pixel can have a memory circuit, with in picture frame memory image data in the time.Therefore, do not need to receive by data line constantly the characteristic of image data, can keep the image data in the memory circuit.Thus, source electrode driver need not store pixel data constantly and it is write to respective pixel, and making does not need to provide additional power to source electrode driver in the case, thereby can reduce power consumption.This type of drive demonstration situation to slightly dark especially is useful.

The above only is an illustrative, and non-limiting.Anyly do not break away from spirit of the present invention and category, and, all should be included in the claim institute restricted portion its equivalent modifications of carrying out or change.

Claims (10)

1. a display device is characterized in that, comprising:

A plurality of pixels respectively have:

One luminescence unit;

One memory circuit stores an image data; And

One drive circuit couples with described luminescence unit and described memory circuit, and drives described luminescence unit according to described image data.

2. display device according to claim 1 is characterized in that described luminescence unit is an Organic Light Emitting Diode.

3. display device according to claim 1 is characterized in that, described memory circuit is a static RAM or can be with the capacitor of digital form storage data.

4. display device according to claim 1 is characterized in that, described pixel also comprises:

One mode switch circuit couples with a described memory circuit and a pattern control line, controls described driving circuit and drives described luminescence unit according to the described image data that is stored in described memory circuit with general mode or in-pixel memory pattern.

5. display device according to claim 4 is characterized in that, described mode switch circuit comprises:

One enables switch, this is enabled switch and described driving circuit and described memory circuit and couples, and controls described driving circuit and drives described luminescence unit according to the described image data that is stored in described memory circuit with described general mode or described in-pixel memory pattern; And

One feedbacks switch, this back coupling switch and describedly enable switch and described luminescence unit couples, and when described luminescence unit is luminous, this back coupling switch open and connect a described switch and the bias voltage lead enabled.

6. display device according to claim 4 is characterized in that, also comprises:

A plurality of sweep traces couple with described pixel respectively; And

A plurality of data lines couple with described pixel respectively.

7. display device according to claim 6 is characterized in that, each pixel also comprises:

One on-off circuit, this on-off circuit couple described memory circuit, described sweep trace one of them, and described data line one of them,

Wherein under described general mode, described sweep trace output one scan signal is opened described on-off circuit, and described data line writes described image data to described memory circuit.

8. display device according to claim 7 is characterized in that, the leakage current of described on-off circuit makes the stored image data of described memory circuit utilize described uneven leakage current to keep greater than the leakage current of described mode switch circuit.

9. display device according to claim 6 is characterized in that, under described in-pixel memory pattern, a high voltage level is provided to described data line, and does not have sweep signal to provide to described sweep trace.

10. image display system according to claim 1 is characterized in that, also comprises:

One display device has an organic electroluminescence assembly.

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