CN102117596A - OLED (Organic Light emitting Display) and method for detecting outside input - Google Patents

OLED (Organic Light emitting Display) and method for detecting outside input Download PDF

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CN102117596A
CN102117596A CN2009102480642A CN200910248064A CN102117596A CN 102117596 A CN102117596 A CN 102117596A CN 2009102480642 A CN2009102480642 A CN 2009102480642A CN 200910248064 A CN200910248064 A CN 200910248064A CN 102117596 A CN102117596 A CN 102117596A
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voltage
unit
data voltage
data
light emitting
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CN102117596B (en
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霍思涛
凌志华
何为
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Shanghai Tianma Microelectronics Co Ltd
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Shanghai Tianma Microelectronics Co Ltd
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Abstract

The invention discloses an OLED (Organic Light emitting Display) and a method for detecting outside input, wherein the method for detecting outside input is applied to the OLED. The OLED comprises a plurality of pixel units, and each pixel unit comprises a storage unit for storing data voltage. The method for detecting outside input comprises the following steps of: outputting a data voltage for displaying to the plurality of pixel units and storing the data voltage in the storage unit; providing a sensing unit for changing the data voltage stored in the storage unit when a signal is input from the outside; and providing a control unit for judging whether the outside input exists or not according to the change of the data voltage stored in the storage unit. The invention is used for measuring the data voltage of the storage unit to obtain a reference voltage and a first voltage, and setting different reference voltages for judgment according to different properties of images, and has the advantages of accurate detection result and simple realization circuits.

Description

Organic light emitting display and extraneous input detecting method
Technical field
The present invention relates to organic light emitting display and use the extraneous input detecting method of this organic light emitting display.
Background technology
Organic light emitting display (OLED) becomes one of flat-panel monitor with the fastest developing speed gradually with advantages such as its light, thin, bright in luster, wide visual angle, high-contrasts, and for example is widely used in the electronic equipment such as mobile phone.Organic light emitting display utilizes luminous organic material to come displayed image, changes brightness according to the size of the current/voltage that is applied, to realize the demonstration of different GTGs.
In general, comprise and also comprising usually in the electronic equipment of organic light emitting display as the microprocessor of control maincenter and the input block that receives user instruction.Microprocessor is connected with input block, receives user's operational order by means of the operation interface of input block; And organic light emitting display is connected with microprocessor, and uniaxially is carried out display operation from microprocessor receives signals and according to the instruction of correspondence.
With reference to figure 1, be illustrated as the equivalent circuit diagram of above-mentioned organic light-emitting display device picture element unit, specifically, described organic light emitting display comprise multi-strip scanning line 105, many data lines 107 that intersect with described multi-strip scanning line 105 and the pixel cell 100 of sweep trace 105 and data line 107 intersections.Each pixel cell 100 comprises: switching thin-film transistor 101, and its grid connects sweep trace 105, and source electrode connects data line 107; Drive thin film transistors 103, its grid is connected with an end of memory capacitance 102 and the drain electrode of switching thin-film transistor 101, and its source electrode connects supply voltage 106; The other end of memory capacitance 102 connects supply voltage 106; The positive pole of photoelectric diode 104 is connected minus earth with the drain electrode of drive thin film transistors 103.
In the course of the work, sweep trace 105 transmission gating signals make switching thin-film transistor 101 open; Voltage in the switching thin-film transistor 101 transmission data lines 107 makes memory capacitance 102 be recharged, and the two ends of memory capacitance 102 keep certain voltage difference; When described voltage difference surpassed the threshold voltage of drive thin film transistors 103, drive thin film transistors 103 was opened, and supply voltage transfers to light emitting diode 104 by drive thin film transistors 103, makes light emitting diode 104 start working, and showed thereby produce.
Yet, compared to this uniaxially from microprocessor receives signals and the organic light emitting display that shows, that the consumer favors more is interactive in having more, can directly receive user instruction and carry out the relevant organic light emitting display that shows output immediately by indicator screen.
At present, the function in order to realize that in display device interactive input shows is aided with sensing technologies such as touching technique or light-operated technology usually.In general, the making of this type of organic light emitting display, generally include: produce independent touch panel or light control system earlier, and produced touch panel is additional to original indicator screen surface, perhaps the light control system of made is additional to around original organic light emitting display.Yet for the function that realizes that interactive input shows, the mode that existing employing adds touch panel can cause the increase of organic light emitting display thickness, can't adapt to the current consumer consumption demand frivolous to electronic equipment.And on original organic light emitting display or the other additional independent sensor-based system such as light-operated of side also can bring similar problem.
Summary of the invention
The technical matters that the present invention solves is that the organic light emitting display of prior art can't adapt to the current consumer consumption demand frivolous to electronic equipment.
For solving the problems of the technologies described above, the invention provides a kind of organic light emitting display, it comprises control module and a plurality of pixel cell, each pixel cell comprises the storage unit that is used to store data voltage, it is characterized in that, at least one pixel cell comprises a sensing unit, and when having extraneous input signal, described sensing unit changes the data voltage of described cell stores; Described control module judges according to the variation of described data voltage whether described pixel cell exists extraneous input, and when having the input of the described external world it is positioned.
Optionally, described pixel cell further comprises a detector switch unit, described control module obtains the data voltage of described cell stores when described organic light emitting display shows the former frame image by described detector switch unit, with the data voltage of described cell stores when showing the present frame picture, to detect the variation of data voltage.
Optionally, described pixel cell further comprises a detector switch unit, described control module is in described organic light emitting display shows a frame image time, by the described detector switch unit successively data voltage of twice described cell stores of detection, to detect the variation of data voltage.
Optionally, described control module obtains first voltage and reference voltage according to the variation of described memory cell data voltage, more described first voltage and described reference voltage, judge whether to exist extraneous input, and when having extraneous input, it is positioned; Wherein, described reference voltage described memory cell data voltage and obtaining when not having extraneous input, described first voltage described memory cell data voltage and obtaining when waiting to judge whether to exist extraneous input.
Optionally, described control module comprises: the voltage acquiring unit, be used for variation according to described memory cell data voltage, and obtain described reference voltage and described first voltage; Difference computational unit is used to calculate the difference of first voltage and described reference voltage; Whether judging unit is used for the result of calculation according to described difference computational unit, exist extraneous input to judge to described pixel cell.
Optionally, described voltage acquiring unit comprises: the reference voltage acquiring unit is used for data voltage with memory capacitance described in the former frame image as described reference voltage; The first voltage acquiring unit is used for data voltage with memory capacitance described in the current frame image as described first voltage.
Optionally, described voltage acquiring unit also comprises the reference voltage amending unit, is used for according to the side circuit effect reference voltage being revised.
Optionally, described reference voltage amending unit is according to the frame head of each two field picture and the data voltage of the pairing storage unit of postamble, by described circuit model described storage unit gross data magnitude of voltage during frame head in two field picture is calculated, obtain its gross data magnitude of voltage at postamble, and with described gross data magnitude of voltage as described reference voltage.
Optionally, described reference voltage amending unit comprises: the circuit model unit is used to obtain the circuit model corresponding with described organic light emitting display; Computing unit is used for calculating reference voltage according to the data voltage of described storage unit and the circuit model of circuit model unit.
Optionally, described sensing unit comprises: the voltage-regulation unit, be used for input according to the external world, and change the data voltage that described storage unit is stored, one end and described storage unit are connected in the output terminal of described switch element; The detector switch unit, one end and described sensing unit are connected in the output terminal of described switch element, are used for the gating signal according to the neighbor sweep trace, and the data voltage value of described storage unit is transferred to described control module.
Optionally, described voltage-regulation unit is a light sensitive diode, and its positive pole and described storage unit are connected in the output terminal of described switch element, and negative pole is connected in supply voltage.
Optionally, described voltage-regulation unit is a light sensitive diode, and its negative pole and described storage unit are connected in the output terminal of described switch element, its plus earth.
Optionally, described light sensitive diode is a thin film transistor (TFT), and its grid is connected with source electrode, and as the negative pole of described light sensitive diode, its drain electrode is as the positive pole of described light sensitive diode.
Optionally, described voltage-regulation unit is a thermistor, and its other end is connected in power supply or ground connection.
The present invention also provides a kind of extraneous input detecting method, be applied to organic light emitting display, described organic light emitting display comprises a plurality of pixel cells, each pixel cell comprises that one is used to store the storage unit of data voltage, described extraneous input detecting method comprises: output is used for data presented voltage to described a plurality of pixel cells, and is stored in the described storage unit; One sensing unit is provided, is used for when extraneous input signal, changing the data voltage of described cell stores; One control module is provided, is used for judging whether to exist extraneous input according to the data voltage variation of this cell stores.
Optionally, the data voltage of described change cell stores comprises: employing light sensitive diode surround lighting stimulation is to external world responded to, and the data voltage of the described storage unit of maintenance is changed.
Optionally, the data voltage of described change cell stores comprises: employing thermistor infrared ray stimulation is to external world responded to, and the data voltage of the described storage unit of maintenance is changed.
Optionally, the described data voltage that changes described cell stores when extraneous input signal comprises: according to image property, obtain the reference voltage as benchmark; Change the data voltage that described storage unit is stored, obtain first voltage.
Optionally, described reference voltage obtains through the following steps: for every two field picture, measure the data voltage of described storage unit, and data voltage value that will be corresponding with every two field picture is as the corresponding described reference voltage of next frame image.
Optionally, described reference voltage obtains through the following steps: when obtaining the data voltage of the storage unit corresponding respectively with the frame head of every two field picture and postamble, and will with the corresponding data voltage of described image frame head as described reference voltage.
Optionally, described will comprising as reference voltage: set up the circuit model corresponding with described organic light-emitting display device with the corresponding data voltage of image frame head; According to described circuit model and when the image frame head data voltage value of described storage unit, calculate the gross data magnitude of voltage of described storage unit when the image postamble, and with the gross data magnitude of voltage that obtained as described reference voltage.
Optionally, described data voltage according to cell stores changes and judges whether to exist extraneous input to comprise: more described first voltage and reference voltage; Judge whether to exist extraneous input and described extraneous input is positioned according to comparative result, when the comparative result of described first voltage and described reference voltage is in preset range, then do not have extraneous input; When the comparative result of first voltage and reference voltage exceeds preset range, then there is extraneous input.
Compared with prior art, organic light emitting display provided by the invention can realize the induction of input to external world by simple circuit configuration, do not need additionally to increase the external detection element, simple in structure, it is convenient to realize, need not to increase complicated peripheral circuit, and can be compatible mutually with existing CMOS technology, cost reduced.
In addition, external input detecting method provided by the present invention is by measuring the data voltage of described storage unit, and according to its acquisition reference voltage and first voltage, the comparison reference voltage and first voltage, and judge whether to exist extraneous input, and when having extraneous input, this external world imported and position according to described comparative result.The present invention realizes that conveniently circuit is simple, and can realize according to different images character, judges respectively whether there being extraneous input between frame and the frame and between the frame head of same frame and the postamble.
Description of drawings
Fig. 1 is the structural representation of conventional organic light-emitting display device picture element unit equivalent electrical circuit in the prior art;
Fig. 2 is the electrical block diagram of organic light emitting display one embodiment of the present invention;
Fig. 3 is the structural representation of extraneous input detection unit among Fig. 2;
Fig. 4 is the structural representation of a kind of specific embodiment equivalent electrical circuit of organic light emitting display of the present invention;
Fig. 5 is the structural representation of a kind of specific embodiment of organic light emitting display voltage acquiring unit of the present invention;
Fig. 6 is the structural representation of the another kind of specific embodiment of organic light emitting display voltage acquiring unit of the present invention;
Fig. 7 is the structural representation of the another kind of specific embodiment equivalent electrical circuit of organic light emitting display of the present invention;
Fig. 8 is the schematic flow sheet of the extraneous input detecting method embodiment of the present invention;
Fig. 9 is the schematic flow sheet of a kind of embodiment of the extraneous input detecting method of the present invention;
Figure 10 is the schematic flow sheet of 1 one kinds of embodiments of step S shown in Figure 9;
Embodiment
The present invention adopts the sensor-based system that is embedded in organic light emitting display, import according to the external world, data voltage to storage unit exerts an influence, and, set different frequencies the data voltage of described storage unit is measured, and obtain the reference voltage and first voltage according to measurement result according to different images character, and described reference voltage and described first voltage compared, judge whether to exist extraneous input according to comparative result, when having extraneous input, input position is positioned.In embodiment of the present invention, can or detect step by simple circuit configuration, realize whether having the detection of extraneous input and existing extraneous input being positioned.
With reference to figure 2, embodiment of the present invention provides a kind of organic light emitting display, comprising: multi-strip scanning line 310 and many data lines 320, and by adjacent sweep trace and adjacent a plurality of pixel cells 300 that data line surrounded.Wherein, each pixel cell 300 can comprise: according to the display unit 330 of sweep trace 310 and data line 320 execution display operations.Specifically, display unit 330 comprises: switch element 331, its first input end is connected with data line 320 with sweep trace 310 respectively with second input end, opens and transmit the data voltage that receives from data line 320 when switch element 331 receives gating signal from sweep trace 310; Driver element 332, its first input end is connected with power supply 370, and its second input end is connected with the output terminal of switch element 331, is used for according to the data voltage by switch element 331 outputs, the drive current that is provided for showing; Storage unit 333, the one end is connected with power supply 370, and an end is connected with the output terminal of switch element 331, is used to store the data voltage by switch element 331 outputs; Luminescence unit 334, the one end is connected with the output terminal of driver element 332, and other end ground connection when the drive current that receives from driver element 332 meets display condition, is carried out luminous according to photoelectric effect.
Described organic light emitting display also comprises: control module 400, be used for by sweep trace 310 transmission gating signals, the variation of the data voltage by data line transport storage cell 333, and judge based on the variation of described data voltage whether described organic light emitting display exists extraneous input.
In addition, pixel cell 300 also can comprise: sensing unit 340, be distributed in around the pixel cell 300, and when having extraneous input signal, change the data voltage of storage unit 333.
Wherein, as detection node, can obtain the data voltage that storage unit 333 is stored with the output terminal of described switch element 331 by the magnitude of voltage of described detection node is measured.When having extraneous input, sensing unit 340 is imported the magnitude of voltage that changes described detection node according to the described external world, and detects according to the magnitude of voltage of setpoint frequency to this detection node, and the magnitude of voltage of described detection node is transferred to control module 400.In concrete enforcement, described control module 400 comprises extraneous input detection unit at least, and described extraneous input detection unit is handled the data voltage value of storage unit 333, to determine extraneous input position.
Specifically, sensing unit 340 be provided with density can according to the design needs regulate.
In one embodiment, can a sensing unit 340 be set correspondence in each pixel cell 300.At this moment, with reference to figure 2, sensing unit 340 can comprise: voltage-regulation unit 341, one end and storage unit 333 are connected in described detection node, the other end is connected in the high level or the low level of a voltage stabilizing, is used for the input according to the external world, changes the data voltage that storage unit 333 is stored; Detector switch unit 342, the one end is connected with described detection node, is used for the gating signal according to the neighbor sweep trace, and the magnitude of voltage of storage unit 333 is transferred in the control module 400.
In another embodiment, a sensing unit 340 can be set between a plurality of pixel cells, import according to the outside, change the data voltage of being stored in corresponding one or more pixel cells, and according to the gating signal of neighbor sweep trace, the data voltage of being stored in one or more pixel cells with correspondence transfers to control module, to realize the detection of input to external world.
At this moment, control module 400 can comprise: data-driven unit 410 is used for storage, transmits data voltages by data line 320; Sweep signal control module 420 is used to provide the gating signal on the sweep trace; Extraneous input detection unit 430 is used for judging whether to exist extraneous input according to the data voltage of sensing unit 340, and when having extraneous input, it is positioned.Wherein, control module 400 also comprises: with the signal wire that detecting unit 340 is connected, be used for obtaining described data voltage from sensing unit 340.
In one embodiment, with reference to figure 3, extraneous input detection unit 430 comprises: voltage acquiring unit 431, be connected with described signal wire, be used for data voltage, obtain the reference voltage and first voltage, wherein according to sensing unit 340, the data voltage of the data voltage of described reference voltage sensing unit 340 when not having extraneous input and obtaining, described first voltage sensing unit 340 when waiting to judge whether to have extraneous input and obtaining; Difference computational unit 432 is used to calculate the difference of described first voltage and described reference voltage; Whether judging unit 433 is used for the result of calculation according to difference computational unit 432, exist extraneous input to judge to the corresponding pixel points position.
Below in conjunction with the specific embodiments and the drawings of organic light emitting display of the present invention, the embodiment of organic light emitting display of the present invention is further set forth.
With reference to figure 4, this organic light emitting display can adopt with sweep trace, for example sweep trace i-1, sweep trace i and sweep trace i+1, and data line, and data line 507 etc. for example, the ranks that constituted indicate and gating pixel cell.
Cooperating the pixel cell of being controlled 500 with sweep trace i and data line 507 is example, and switching thin-film transistor 501 is the switch element in this pixel cell 500, and its grid is connected with sweep trace i, and source electrode is connected with data line 507; Drive thin film transistors 502 is the driver element in this pixel cell 500, and its source electrode connects power lead 508, and grid is connected with the drain electrode end of switching thin-film transistor 501; Memory capacitance 503 is the storage unit in this pixel cell 500, and the two poles of the earth of memory capacitance 503 are connected to the source electrode and the grid of drive thin film transistors 502; Light emitting diode 504 is the luminescence unit in this pixel cell 500, and its positive pole connects the drain electrode of drive thin film transistors 502, and its minus earth can be realized the demonstration of pixel by lighting light emitting diode 504.Switching thin-film transistor 501 and memory capacitance 503, drive thin film transistors 502 be totally one node N, and this node N is detection node N.
In the concrete course of work of pixel cell 500, at first, when gating pixel cell 500, transmit gating signals to switching thin-film transistor 501 by sweep trace i, switching thin-film transistor 501 is opened, then with the drain electrode output of the voltage on the data line 507 by switching thin-film transistor 501; Then, the voltage on the data line 507 begins memory capacitance 503 chargings.Specifically, the maintenance of switching thin-film transistor 501 conducting states makes memory capacitance 503 continue to be recharged, and therefore, the duration of charging of memory capacitance 503 is subjected to the influence of gating signal width among the sweep trace i.
Along with the lasting charging of memory capacitance 503, the voltage at detection node N place constantly raises.Because memory capacitance 503 is connected in parallel in the two poles of the earth, grid source of drive thin film transistors 502, when the voltage at detection node N place surpasses the threshold voltage of drive thin film transistors 502, drive thin film transistors 502 is opened, and supply voltage is transferred to light emitting diode 504.There is voltage difference in light emitting diode 504 two ends, and light emitting diode 504 is lighted.Even,, therefore can keep the illuminating state of light emitting diode 504 because memory capacitance 503 can be stored this voltage and then be kept the magnitude of voltage at detection node N place when switching thin-film transistor 501 ends.
Pixel cell 510 is adjacent with pixel cell 500.Be similar to pixel cell 500, pixel cell 510 comprises: switching thin-film transistor 511, and grid is connected with sweep trace i+1, and source electrode is connected with data line 507; Drive thin film transistors 512, source electrode connects power lead 508, and grid is connected with the drain electrode of switching thin-film transistor 511; Memory capacitance 513, its two ends are connected to the source electrode and the grid of drive thin film transistors 512; Light emitting diode 514, its anodal drain electrode that connects drive thin film transistors 512, minus earth can be realized the demonstration of pixel by lighting light emitting diode 514.Switching thin-film transistor 511 and memory capacitance 513, drive thin film transistors 512 be totally one detection node N1.
Wherein, light sensitive diode 505 and light sensitive diode 515 are arranged at respectively in pixel cell 500 and the pixel cell 510, this light sensitive diode 505 and light sensitive diode 515 are respectively the voltage-regulation unit of sensing unit in pixel cell 500 and the pixel cell 510, when having extraneous input, change the data voltage of memory capacitance 503, thereby to whether existing extraneous input to detect in pixel cell 500 and the pixel cell 510.Wherein, the two ends of light sensitive diode 505 are connected in parallel in the two ends of memory capacitance 503, and the two ends of light sensitive diode 515 are connected in parallel in the two ends of memory capacitance 513; Inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 are arranged at respectively in pixel cell 500 and the pixel cell 510, and inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 are respectively the detector switch unit of sensing unit in pixel cell 500 and 510; The drain electrode of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected to signal wire 509, the grid correspondence of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected in sweep trace i-1 and sweep trace i, and the source electrode correspondence of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected in an end that is not connected power lead 508 in light sensitive diode 505 and the light sensitive diode 515.
Specifically, with reference to figure 5, voltage acquiring unit 431 in the extraneous input detection unit 430 can comprise the first voltage acquiring unit 601, and reference voltage acquiring unit 602, the first voltage acquiring unit 601 all is connected with signal wire 509 with reference voltage acquiring unit 602, obtains the data voltage of memory capacitance to obtain described first voltage and reference voltage by signal wire 509.
In the concrete course of work, especially in the procedure for displaying of still image, when the ablation process of last frame image signal, as sweep trace i during to switching thin-film transistor 501 transmission gating signals, inductive switch thin film transistor (TFT) 516 is opened; Data voltage in the pixel cell 510 in the memory capacitance 513 is read out to signal wire 509, and transfers to described reference voltage acquiring unit in the voltage acquiring unit 431 by signal wire 509, and this magnitude of voltage is and pixel cell 510 corresponding reference voltages.
When the screen input signal of the external world by described organic light emitting display, input optical signal for example, light sensitive diode 515 is because of receiving this input signal reverse-conducting, voltage on the power lead is transferred to this detection node N, this voltage makes memory capacitance 513 chargings, and finally making the data voltage of memory capacitance 513 be stabilized in a new magnitude of voltage, this moment, the voltage at detection node N1 place also was fixed on this magnitude of voltage.When carrying out the ablation process of current frame image, inductive switch thin film transistor (TFT) 516 reopens, and the data voltage of memory capacitance 513 is transferred to the described first voltage acquiring unit in the voltage acquiring unit 431 by signal wire 509, is first voltage.
Described first voltage is transferred to the extraneous input detection unit 430 in the control module 400, by itself and corresponding reference voltage are compared, judges whether to exist extraneous input signal.Specifically, between described first voltage and described reference voltage, have difference, and described difference then can judge to have extraneous input, and the position of extraneous input is at pixel cell 510 places not in preset range the time; And not having difference when between described first voltage and the described reference voltage, perhaps described difference then can be judged not have extraneous the input in preset range the time.Wherein, can according to sense diode to external world the induction precision etc. of light described preset range is set.
Owing to have circuit delay and components and parts loss in the side circuit, at frame head and the postamble that a two field picture shows, be subjected to the effect of discharging and recharging of memory capacitance and the influence of voltage retention, the data voltage value in the memory capacitance tends to produce some variations.In order to pick out the variation of the value of data voltage described in the memory capacitance, be caused by the side circuit effect or since light sensitive diode to be subjected to the external environment light stimulus caused, be necessary in advance described reference voltage to be revised, this demonstration for dynamic image is particularly important.
Correspondingly, with reference to figure 6, voltage acquiring unit 431 also can comprise reference voltage amending unit 603, is used for according to the side circuit effect reference voltage being revised; Specifically, can calculate the theoretical value of described data voltage according to the pixel cell that is provided at postamble, and with this as described reference voltage.For example, reference voltage amending unit 603 can comprise: the circuit model unit, be used for according to described driving circuit, and obtain corresponding circuit model; Computing unit is used for the circuit model according to described measurement result and circuit model unit, calculates reference voltage.Specifically, can set up corresponding circuit model by described circuit model unit, and by described computing unit, obtain the charge rate of memory capacitance and the voltage retention of described data voltage based on described circuit model, and then obtain the theoretical value of described data voltage at postamble, i.e. reference voltage.Then, by the difference computational unit 432 in the extraneous input detection unit 430, described first voltage and described reference voltage are compared.At this moment, because described reference voltage is the theoretical value of described data voltage at postamble, therefore, when described first voltage is different from described reference voltage, and when both differences surpass preset range, promptly have extraneous input, and extraneous input is positioned at the position of this pixel cell; Otherwise when described first voltage is identical with described reference voltage, or both differences are when preset range, promptly do not have extraneous input.
With reference to figure 7, in another specific embodiment of the present invention, light sensitive diode 505 and light sensitive diode 515 are arranged at respectively in pixel cell 500 and the pixel cell 510, be used for whether existing extraneous input to detect to position with pixel cell 505 and pixel cell 515, wherein, one end of light sensitive diode 505 is connected in an end that links to each other with drive thin film transistors 502 grids in the memory capacitance 503, its other end ground connection.One end of light sensitive diode 515 is connected in an end that links to each other with drive thin film transistors 512 grids in the memory capacitance 513, its other end ground connection; Inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 are arranged at respectively in pixel cell 500 and the pixel cell 510, wherein, the drain electrode of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected to signal wire 509, the grid correspondence of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected in sweep trace i-1 and sweep trace i, and the source electrode correspondence of inductive switch thin film transistor (TFT) 506 and inductive switch thin film transistor (TFT) 516 is connected in an earth-free end in light sensitive diode 505 and the light sensitive diode 515.
Similarly, demonstration for still image, can will write fashionable at the former frame image, the voltage of memory capacitance 513 is as reference voltage in the pixel cell 510, when itself and current frame image are write in the pixel cell 510 voltage of memory capacitance 513 compare, judging whether to exist extraneous input, and judge whether described extraneous input is positioned at pixel cell 510 places.Specifically, write fashionable at the former frame image, transmit gating signals by sweep trace i to switching thin-film transistor 511, inductive switch thin film transistor (TFT) 516 is opened, and export the voltage of memory capacitance 513 in the pixel cell 510 to signal wire 509, and by signal wire 509 with the extraneous input detection unit 430 of described voltage transmission to the control module 400, to provide and pixel cell 510 corresponding reference voltages.
And in the procedure for displaying of dynamic image, obtain unit 431 by the reference voltage in the extraneous input detection unit 430, according to the pixel cell that is provided, calculate the theoretical value of described data voltage at postamble, and with this as described reference voltage.
Then, write fashionable at present image, transmit gating signals by sweep trace i to switching thin-film transistor 511, inductive switch thin film transistor (TFT) 516 is opened, voltage with detection node N1 place in the pixel cell 510, be that data voltage in the storage unit 513 exports signal wire 509 to, and by signal wire 509 with the extraneous input detection unit 430 of described voltage transmission to the control module 400, so that first voltage corresponding with this pixel cell 510 to be provided.
By the comparing unit 432 in the extraneous input detection unit 430, described first voltage and described reference voltage are compared, judging whether to exist extraneous input, and whether described extraneous input is positioned at pixel cell 510 places.
In other embodiments, the sensor film transistor that a light sensitive diode also can be set in several pixel cells and be used to control its signal transmission.
In the above-described embodiment, this light sensitive diode is to adopt the film transistor manufacture craft to make, thereby makes the making of described driving circuit compatible mutually with existing CMOS technology commonly used, reduces process complexity, saves cost.
In other embodiments, also can adopt thermistor to replace the light sensitive diode in the above-mentioned embodiment, to realize that organic light emitting display of the present invention can detect in infrared input to external world.
Compared to existing organic light emitting display, the respective embodiments described above of the present invention provide a kind of organic light emitting display, by sensing unit is set in driving circuit, adopt light sensitive diode or thermistor as senser element, input is responded to external world, and utilizes the magnitude of voltage of the variation change detection node end of the caused voltage of described induction; By extraneous input detection unit is set in control module, the change in voltage of described detection node end is detected, thereby judge whether to exist extraneous input and detect the concrete position of extraneous input.Because sensing unit is integrated in each pixel cell or between a plurality of pixel cell, simple in structure, it is convenient to realize, need not to increase complicated peripheral circuit, and can be compatible mutually with existing CMOS technology, has reduced cost.
Whether in addition, described extraneous input detection unit comprises the voltage acquiring unit, at different characteristics of image, different reference voltages is set, thereby make existing the detection of extraneous input more accurate.
With reference to figure 8, embodiment of the present invention provides a kind of extraneous input detecting method that is applied to organic light emitting display, described organic light emitting display comprises a plurality of pixel cells, each pixel cell comprises that one is used to store the storage unit of data voltage, described extraneous input comprises in the mode of induction to be imported by the screen of display device, described extraneous input detecting method comprises: step S100, output is used for data presented voltage to described a plurality of pixel cells, and is stored in the described storage unit; Step S200 provides a sensing unit, is used for changing the data voltage of described cell stores when extraneous input signal; Step S300 provides a control module, is used for judging whether to exist extraneous input according to the data voltage variation of this cell stores.
With reference to figure 9, in a kind of embodiment, the extraneous input detecting method of the present invention can comprise: step S1, and output is used for data presented voltage to described a plurality of pixel cells, and is stored in the storage unit; Step S2 according to image property, measures the magnitude of voltage of the described storage unit of extraneous input that whether exists to be measured, obtains first voltage; Step S3 obtains the reference voltage as benchmark, the data voltage of described reference voltage described storage unit when not having extraneous input and obtaining; Step S4, more described first voltage and described reference voltage judge whether to exist extraneous input and when having described extraneous input described extraneous the input are positioned according to comparative result.Wherein, in preset range, then this pixel does not have extraneous input as if described comparative result; If described comparative result exceeds preset range, then there is extraneous input in this pixel.
Wherein, with reference to Figure 10, step S1 can comprise specifically: step S11, and display device is exported gating signal according to display requirement; Step S12, according to described gating signal, data presented voltage is opened and be provided for to corresponding switch element; Step S13, corresponding driver element is opened, and make its driving voltage of lighting for luminescence unit provides, and keep described data voltage by storage unit, thus the demonstration of realization correspondence image.
In step S2, described first voltage can be used for reflecting the influence of extraneous input to the data voltage of described storage unit.Specifically also can comprise: after being subjected to extraneous input, for example be subjected to stimulations such as external environment light or heat, the data voltage of described storage unit will change, at this moment, exist between first voltage that obtains and the reference voltage than evident difference by again described storage unit being measured; And when not having extraneous input, then not there are differences between described first voltage and the reference voltage, perhaps difference is not obvious, promptly in admissible predictive error scope.Particularly, can be by at described storage unit and described switch element detection node being set and described detection node being detected, to obtain the data voltage of described storage unit.
In one embodiment, can adopt light sensitive diode to external world the stimulation of ambient light respond to, and the data voltage of described storage unit is changed along with environmental stimuli.
Wherein, in a kind of specific embodiment, described light sensitive diode positive pole can be connected in described detection node, negative pole is connected in high level, for example supply voltage.In another kind of specific embodiment, also can just described light sensitive diode negative pole be connected in and have described detection node, positive pole is connected in low level, for example ground connection.Then, by measuring the magnitude of voltage of the end that light sensitive diode is connected with described detection node, to obtain first voltage.
When light sensitive diode is subjected to extraneous irradiate light, because it has the character of reverse breakdown, the voltage at its two ends will change.At this moment, measure first voltage that is obtained,, also will produce change with respect to the magnitude of voltage of original detection node.
In another embodiment, also can adopt thermistor to substitute above-mentioned light sensitive diode, the one end is connected with the detection node with described data voltage, and the other end connects power supply or ground connection.When the external world exists infrared ray to stimulate, for example come from human body or infrared light pen, the voltage at thermistor two ends changes, and makes the magnitude of voltage of described detection node also change, and the magnitude of voltage of described detection node is measured, and obtains first voltage.
Step S3 can comprise specifically: on the basis of the factors such as conservation rate of considering charge rate and voltage, described reference voltage and preset range are provided with.Wherein, according to different survey frequencies, can take different reference voltages.When measuring for every two field picture and obtaining a detection node magnitude of voltage, described reference voltage can be according to measure the detection node magnitude of voltage that is obtained in the former frame image; And when when the frame head of every two field picture and postamble are measured described detection node magnitude of voltage respectively, described reference voltage can be measured the detection node magnitude of voltage that obtains at the image frame head and obtain according to described.
Specifically, for the external world in different frame image display process input is detected, can described reference voltage be set to the measurement result of previous frame image.In the previous frame image, the described detection node magnitude of voltage of this pixel is read and preserves with as with reference to voltage.Next, read in the present frame detection node magnitude of voltage of same pixel, i.e. first voltage, more described first voltage and described reference voltage.When described first voltage is different from described reference voltage, and both differences are when surpassing preset range, then can judge to have extraneous input, and extraneous input are positioned at this location of pixels; Otherwise when described first voltage is identical with described reference voltage, or both differences are when preset range, then can think not have extraneous input.In one embodiment, the setting of above-mentioned reference voltage and be applicable to for the input of the external world in the still image procedure for displaying with the comparison procedure of described first voltage and judge and locate.
And in order to realize the input of the external world in the same two field picture procedure for displaying is detected, need consider the influence of side circuit.In the procedure for displaying of each two field picture, at first to driving circuit, for example drive thin film transistors applies data voltage and makes its conducting and keep described data voltage, makes luminous component work, to realize the demonstration of this pixel.Yet, for side circuit, applying of data voltage is not to realize at once, the rising of magnitude of voltage all needs certain process on arbitrary detection node or the device, and because the consumption of components and parts, in fact also there is certain consumption in the data voltage that detection node kept, and frame head and postamble in that a two field picture shows keep the magnitude of voltage that detection node had of described data voltage often to have some differences.Above-mentioned these differences are caused by the side circuit effect, be subjected to the influence of extraneous input no thanks to, so in order to realize detection to extraneous input in the same two field picture procedure for displaying, particularly in the procedure for displaying for dynamic image, be necessary the input of the external world in the same two field picture procedure for displaying is distinguished its influence with side circuit.
Specifically, can actual time delay or loss be taken in according to the driving circuit corresponding, thereby described reference voltage is provided with pixel.In one embodiment, can be according to element in the driver element pixel cell and connection thereof, set up corresponding circuit model, and obtain the conservation rate of its charge rate, voltage according to described circuit model, and detection node is in the measurement result of image frame head, calculates the theoretical value of this detection node magnitude of voltage at the image postamble.For example, can calculate charge rate according to the capacitance of the charging capacitor that is adopted and the value of described data voltage, and can be according to the charging capacitor in the corresponding driving circuit, drive thin film transistors and light emitting diode etc., the conservation rate of calculating voltage, and according to described charge rate and described conservation rate, calculate when the frame head at two field picture when this detection node applies data voltage in pixel, in the postamble of same two field picture, the value that the magnitude of voltage that this detection node had should reach in theory.That is to say, when this driver element pixel cell of gating, according to the circuit model of correspondence can calculate considered after the side circuit effect the theoretical value of obtainable detection node magnitude of voltage, and with this as reference voltage.
Next, read in the present frame first voltage of same pixel, more described first voltage and described reference voltage.Because described reference voltage has been considered the influence that side circuit brought, therefore, when described first voltage is different from described reference voltage, and both differences are when surpassing preset range, promptly have extraneous input, and extraneous input is positioned at the position of this driver element pixel cell; Otherwise when described first voltage is identical with described reference voltage, or both differences are when preset range, promptly do not have extraneous input.
Compared to existing extraneous input detecting method, in extraneous each embodiment of input detecting method of the invention described above, according to different characteristics of image, adopt different metering systems, for example in each two field picture, the magnitude of voltage that detection node had that applies data voltage is measured or respectively the magnitude of voltage that detection node had that applies data voltage is measured at the frame head and the postamble of each two field picture, acquisition is used to reflect first voltage of extraneous input to the influence of described data voltage, and obtain reference voltage according to the measurement result of former frame image or in the frame head measurement result of image, described first voltage and described reference voltage are compared, position to detect whether to have extraneous input and import to external world.Wherein,,, adopt different reference voltages and survey frequency respectively, thereby guaranteed the accuracy of judging and locating for example for still image and dynamic image according to different characteristics of image.
Though the present invention by the preferred embodiment explanation as above, these preferred embodiments are not in order to limit the present invention.Those skilled in the art without departing from the spirit and scope of the present invention, should have the ability various corrections and additional are made in this preferred embodiment, and therefore, protection scope of the present invention is as the criterion with the scope of claims.

Claims (22)

1. organic light emitting display, it comprises control module and a plurality of pixel cell, each pixel cell comprises the storage unit that is used to store data voltage, it is characterized in that, at least one pixel cell comprises a sensing unit, when having extraneous input signal, described sensing unit changes the data voltage of described cell stores; Described control module judges according to the variation of described data voltage whether described pixel cell exists extraneous input, and when having the input of the described external world it is positioned.
2. organic light emitting display as claimed in claim 1, it is characterized in that, described pixel cell further comprises a detector switch unit, described control module obtains the data voltage of described cell stores when described organic light emitting display shows the former frame image by described detector switch unit, with the data voltage of described cell stores when showing the present frame picture, to detect the variation of data voltage.
3. organic light emitting display as claimed in claim 1, it is characterized in that, described pixel cell further comprises a detector switch unit, described control module is in described organic light emitting display shows a frame image time, by the described detector switch unit successively data voltage of twice described cell stores of detection, to detect the variation of data voltage.
4. organic light emitting display as claimed in claim 1, it is characterized in that, described control module is according to the variation of described memory cell data voltage, obtain first voltage and reference voltage, more described first voltage and described reference voltage, judge whether to exist extraneous input, and when having extraneous input, it is positioned; Wherein, described reference voltage described memory cell data voltage and obtaining when not having extraneous input, described first voltage described memory cell data voltage and obtaining when waiting to judge whether to exist extraneous input.
5. organic light emitting display as claimed in claim 4 is characterized in that, described control module comprises: the voltage acquiring unit, be used for variation according to described memory cell data voltage, and obtain described reference voltage and described first voltage;
Difference computational unit is used to calculate the difference of first voltage and described reference voltage;
Whether judging unit is used for the result of calculation according to described difference computational unit, exist extraneous input to judge to described pixel cell.
6. organic light emitting display as claimed in claim 5 is characterized in that, described voltage acquiring unit comprises: the reference voltage acquiring unit is used for data voltage with memory capacitance described in the former frame image as described reference voltage; The first voltage acquiring unit is used for data voltage with memory capacitance described in the current frame image as described first voltage.
7. organic light emitting display as claimed in claim 6 is characterized in that, described voltage acquiring unit also comprises the reference voltage amending unit, is used for according to the side circuit effect reference voltage being revised.
8. organic light emitting display as claimed in claim 7, it is characterized in that, described reference voltage amending unit is according to the frame head of each two field picture and the data voltage of the pairing storage unit of postamble, by described circuit model described storage unit gross data magnitude of voltage during frame head in two field picture is calculated, obtain its gross data magnitude of voltage at postamble, and with described gross data magnitude of voltage as described reference voltage.
9. organic light emitting display as claimed in claim 8 is characterized in that, described reference voltage amending unit comprises:
The circuit model unit is used to obtain the circuit model corresponding with described organic light emitting display;
Computing unit is used for calculating reference voltage according to the data voltage of described storage unit and the circuit model of circuit model unit.
10. organic light emitting display as claimed in claim 1 is characterized in that, described sensing unit comprises:
The voltage-regulation unit is used for the input according to the external world, changes the data voltage that described storage unit is stored, and one end and described storage unit are connected in the output terminal of described switch element;
The detector switch unit, one end and described sensing unit are connected in the output terminal of described switch element, are used for the gating signal according to the neighbor sweep trace, and the data voltage value of described storage unit is transferred to described control module.
11. organic light emitting display as claimed in claim 10 is characterized in that, described voltage-regulation unit is a light sensitive diode, and its positive pole and described storage unit are connected in the output terminal of described switch element, and negative pole is connected in supply voltage.
12. organic light emitting display as claimed in claim 11 is characterized in that, described voltage-regulation unit is a light sensitive diode, and its negative pole and described storage unit are connected in the output terminal of described switch element, its plus earth.
13., it is characterized in that described light sensitive diode is a thin film transistor (TFT) as claim 11 or 12 described organic light emitting display, its grid is connected with source electrode, as the negative pole of described light sensitive diode, its drain electrode is as the positive pole of described light sensitive diode.
14. organic light emitting display as claimed in claim 10 is characterized in that, described voltage-regulation unit is a thermistor, and its other end is connected in power supply or ground connection.
15. an extraneous input detecting method that is applied to organic light emitting display, described organic light emitting display comprises a plurality of pixel cells, and each pixel cell comprises that one is used to store the storage unit of data voltage, and described extraneous input detecting method comprises:
Output is used for data presented voltage to described a plurality of pixel cells, and is stored in the described storage unit;
One sensing unit is provided, is used for when extraneous input signal, changing the data voltage of described cell stores;
One control module is provided, is used for judging whether to exist extraneous input according to the data voltage variation of this cell stores.
16. extraneous input detecting method as claimed in claim 15, it is characterized in that, the data voltage of described change cell stores comprises: employing light sensitive diode surround lighting stimulation is to external world responded to, and the data voltage of described storage unit is changed.
17. extraneous input detecting method as claimed in claim 15 is characterized in that, the data voltage of described change cell stores comprises: employing thermistor infrared ray stimulation is to external world responded to, and the data voltage of described storage unit is changed.
18. extraneous input detecting method as claimed in claim 15 is characterized in that, the described data voltage that changes described cell stores when extraneous input signal comprises:
According to image property, obtain reference voltage as benchmark;
Change the data voltage that described storage unit is stored, obtain first voltage.
19. extraneous input detecting method as claimed in claim 18, it is characterized in that, described reference voltage obtains through the following steps: for every two field picture, measure the data voltage of described storage unit, and data voltage value that will be corresponding with every two field picture is as the corresponding described reference voltage of next frame image.
20. extraneous input detecting method as claimed in claim 18, it is characterized in that, described reference voltage obtains through the following steps: when obtaining the data voltage of the storage unit corresponding respectively with the frame head of every two field picture and postamble, and will with the corresponding data voltage of described image frame head as described reference voltage.
21. extraneous input detecting method as claimed in claim 20 is characterized in that, described will comprising as reference voltage with the corresponding data voltage of image frame head:
Set up the circuit model corresponding with described organic light-emitting display device;
According to described circuit model and when the image frame head data voltage value of described storage unit, calculate the gross data magnitude of voltage of described storage unit when the image postamble, and with the gross data magnitude of voltage that obtained as described reference voltage.
22. extraneous input detecting method as claimed in claim 18 is characterized in that, described data voltage variation according to cell stores judges whether to exist extraneous input to comprise: more described first voltage and reference voltage; Judge whether to exist extraneous input and described extraneous input is positioned according to comparative result, when the comparative result of described first voltage and described reference voltage is in preset range, then do not have extraneous input; When the comparative result of first voltage and reference voltage exceeds preset range, then there is extraneous input.
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