CN105206224A - Display system with feedback channel - Google Patents
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- CN105206224A CN105206224A CN201510618674.2A CN201510618674A CN105206224A CN 105206224 A CN105206224 A CN 105206224A CN 201510618674 A CN201510618674 A CN 201510618674A CN 105206224 A CN105206224 A CN 105206224A
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- 230000032683 aging Effects 0.000 claims abstract description 77
- 239000011159 matrix material Substances 0.000 claims description 37
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000012937 correction Methods 0.000 claims description 11
- 230000008054 signal transmission Effects 0.000 claims description 9
- 230000002431 foraging effect Effects 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 239000010409 thin film Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920001621 AMOLED Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- 230000011664 signaling Effects 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a display system with a feedback channel. The control end of the feedback channel receives a gating signal and is used for gating the feedback channel. The first end of the feedback channel is connected to a driving circuit or a light-emitting diode of one pixel unit and used for receiving an aging signal of the pixel unit. The second end of the feedback channel is connected to the second pole of a switching transistor of the other pixel unit and used for outputting the aging signal to the second pole of the switching transistor of the other pixel unit when the feedback channel is gated, so that the aging signal is transmitted to a display signal line connected with the first pole of the switching transistor through the switching transistor and then transmitted out through the display signal line. Thus, the aging signal is fed back without increasing the load of the display signal line.
Description
Technical field
The application relates to display technique field, is specifically related to a kind of display system with feedback channel.
Background technology
Organic Light Emitting Diode (OrganicLight-EmittingDiode, OLED) because having the advantages such as high brightness, high-luminous-efficiency, wide viewing angle and low-power consumption, extensively studied by people in recent years, and be applied to rapidly in the middle of the display system of a new generation.The type of drive of Organic Light Emitting Diode is divided into passive waked-up (PassiveMatrixOLED, PMOLED) and driven with active matrix (ActiveMatrixOLED, AMOLED) two kinds.Although the mode of passive waked-up is with low cost, there is cross-talk phenomenon and thus can not realize high-resolution display, in addition, passive waked-up electric current is large, can reduce the serviceable life of Organic Light Emitting Diode.By contrast, the mode of driven with active matrix on each pixel cell of picture element matrix, arranges the different transistor of number as current source, thus avoid cross-talk, achieve high-resolution display, driven with active matrix electric current is less again in addition, power consumption is lower, and the life-span of Organic Light Emitting Diode is increased.
Wherein the pixel cell of driven with active matrix is two Thin Film Transistor (TFT) (ThinFilmTransistor, TFT) structures, and this pixel cell comprises driving transistors, switching transistor, memory capacitance and Organic Light Emitting Diode.Switching transistor response, from the show address signals of display address wire, is sampled from the signal of display signal line.Memory capacitance is closed to have no progeny at display switch transistor and is preserved the signal voltage of the display signal line of sampling.The input voltage that driving transistors retains according to memory capacitance between given light emission period supplies output current.The light that Organic Light Emitting Diode is matched by the signal sending its brightness and display signal line from the output current of driving transistors.According to the electric current and voltage formula of Thin Film Transistor (TFT), drive current I
dScan be expressed as:
I
DS＝1/2μ
nC
oxW/L(V
G-V
OLED-V
TH)
2……(1)
Wherein, I
dSdrain electrode for driving transistors flows to the drain current of source electrode, μ
nfor the effective mobility of Thin Film Transistor (TFT), C
oxfor the gate capacitance of Thin Film Transistor (TFT) unit area, W is effective channel width of Thin Film Transistor (TFT), and L is the length of effective channel of Thin Film Transistor (TFT), V
gfor the grid voltage of Thin Film Transistor (TFT), V
oLEDthe bias voltage on Organic Light Emitting Diode, V
tHfor the threshold voltage of Thin Film Transistor (TFT), V
oLEDrelevant to the threshold voltage of Organic Light Emitting Diode OLED.
The structural circuit of two Thin Film Transistor (TFT) of the pixel cell of above-mentioned driven with active matrix, although this circuit is simple, but As time goes on, element wherein can be aging, especially driving transistors and Organic Light Emitting Diode can be aging, direct result is exactly that the threshold voltage of driving transistors and Organic Light Emitting Diode all can produce drift, and in picture element matrix, the driving transistors of pixel cell and the threshold voltage shift situation of Organic Light Emitting Diode are also different everywhere; In addition, because Thin Film Transistor (TFT) adopts polycrystalline silicon material to make, thus the threshold voltage V of the driving transistors of each pixel cell in picture element matrix can be caused
tHthere is the characteristic of unevenness; Above two kinds of situations, known according to formula (1), drive current I
dSat this moment all can change, the unevenness that picture element matrix shows will be caused like this.
The picture element matrix brought for threshold voltage shift and the unevenness of this driving transistors and Organic Light Emitting Diode shows uneven problem, occurs the method that two classes compensate threshold voltage at present: compensate and offset peripheral in pixel cell.Compensate in pixel cell is exactly for Organic Light Emitting Diode provides a constant drive current by the pixel unit circuit structure of complexity, the circuit of this method is not only complicated, and circuit complexity can cause again the aperture opening ratio of pixel cell and yield to decline further; Offset peripheral is compared and can be adopted simpler pixel cell structure, is therefore more suitable for commercial application.
The method of offset peripheral, the general ageing information that first will obtain each pixel cell, compensate correction according to the display of ageing information to each pixel cell again, thus provide the simulative display signal comprising exact image video information through over-compensation for each pixel cell.The signal comprising ageing information of each pixel cell, generally passed by a feedback channel being connected to the pixel cell display signal line of adjacent column, as shown in Figure 1, feedback channel one end is connected to pixel cell, for collecting the ageing information of this pixel cell, the other end be connected to the pixel cell of adjacent column display signal line DATA (the 1st row only having write out the i-th row in figure with the 2nd to arrange, this is just for signal), when feedback channel is by FB [i] signal gating, the ageing information of the pixel cell that just the i-th row the 1st can be arranged, passed by the display signal line DATA [2] of the i-th row the 2nd row pixel cell.Suppose the display screen of 768 row, every bar display signal line is natively ined succession the switching transistor Q1 of 768 pixel cells, now due to feedback channel, and 768 loads that every bar display signal line is just many again, this makes the load of display signal line too much, extremely affects the performance of display screen.
Summary of the invention
For solving the problem, the application provides a kind of display system with feedback channel, and the feedback channel of introducing can not increase the load of display signal line.
The display system of what the application provided have feedback channel, comprising:
Pixel cell, described pixel cell comprises light emitting diode, for driving the driving circuit of described light emitting diode and the switching transistor for pixel cell described in gating; Wherein, the control pole of switching transistor is electrically connected to show address signals line, and the first pole is electrically connected to display signal line, and the second pole is electrically connected to described driving circuit;
Further, also comprise:
Feedback channel, has first end, the second end and control end; The control end of described feedback channel receives gating signal, for feedback channel described in gating; The first end of described feedback channel is connected to driving circuit or the light emitting diode of a pixel cell, for receiving the aging signal of this pixel cell; Second end of described feedback channel is connected to the second pole of the switching transistor of another pixel cell, for aging signal being outputted to when described feedback channel is strobed switching transistor second pole of another pixel cell described, with the display signal line described aging Signal transmissions is extremely connected to switching transistor first therewith by this switching transistor, thus aging signal is transferred out by display signal line.
In a preferred embodiment, described in there is the display system of feedback channel, also comprise:
Picture element matrix, described picture element matrix comprise the capable M of N arrange described pixel cell, N capable described in show address wire and M arranges described display signal line, pixel cell is connected respectively with respective display address wire, display signal line, N and M is positive integer;
Line scanning driver, for sending show address signals by display address alignment picture element matrix, with each row pixel cell of gating successively in a frame;
Row driver, for sending simulative display signal by display alignment picture element matrix, described simulative display signal is used for for pixel cell providing package is containing the display data of image/video information; And, for being received the aging signal of picture element matrix feedback by display signal line.
In a preferred embodiment, the pixel cell that described feedback channel first end connects, the pixel cell of feedback channel second end connection therewith, it is positioned at same a line adjacent column of picture element matrix; Or it is positioned at the adjacent lines adjacent column of picture element matrix.
In a preferred embodiment, described feedback channel comprises a switching transistor, the first pole of described switching transistor, the second pole and control pole and be respectively the first end of described feedback channel, the second end and control end.
In a preferred embodiment, with the feedback channel of a line odd column, its control end all receives one independent of the same strobe signal of show address signals; With the feedback channel of a line even column, its control end all receives another same strobe signal independent of show address signals;
Or,
With the feedback channel of a line odd column, its control end all receives the show address signals of a non-one's own profession as gating signal; With the feedback channel of a line even column, its control end all receives the show address signals of another non-one's own profession as gating signal.
In a preferred embodiment, described aging signal comprises the unequal information of original threshold voltages of driving transistors, light emitting diode in driving circuit in pixel cell; And driving transistors, light emitting diode threshold voltage variation information after usage in driving circuit.
In a preferred embodiment, the described feedback channel period between frames, the aging signal of pixel cell is passed to described row driver by the display signal line of the pixel cell of adjacent column.
In a preferred embodiment, described row driver comprises display generation module/correction signal generation module, for the period between frames, send the simulative display signal/analog correction signal through over-compensation by display alignment picture element matrix, produce aging signal to drive pixel cell.
In a preferred embodiment, described row driver comprises aging signal monitoring module, for being received and analyze the aging signal of feedback by display signal line.
In a preferred embodiment, described pixel cell is the pixel cell of current programmed type or voltage-programming type.
The beneficial effect of the application is:
According to the display system with feedback channel of above-mentioned enforcement, the first end due to feedback channel is connected to driving circuit or the light emitting diode of a pixel cell, for receiving the aging signal of this pixel cell, second end of described feedback channel is connected to the second pole of the switching transistor of another pixel cell, for aging signal being outputted to when described feedback channel is strobed switching transistor second pole of another pixel cell described, with the display signal line described aging Signal transmissions is extremely connected to switching transistor first therewith by this switching transistor, thus aging signal is transferred to described row driver by display signal line, therefore the second end of feedback channel is not be directly connected on display signal line, so both achieved the aging signal of feedback, do not increase again the load of display signal line.
According to the display system with feedback channel of above-mentioned enforcement, due to the described feedback channel period between frames, the aging signal of pixel cell is passed to described row driver by the display signal line of the pixel cell of adjacent column, therefore not only can not affect the display operation in frame, and improve the speed feeding back aging signal.
Accompanying drawing explanation
Fig. 1 is the connection diagram of traditional feedback channel;
Fig. 2 is the structural representation in a kind of embodiment of the application with the display system of feedback channel;
Two kinds of structural representations that Fig. 3 (a) and (b) are pixel cell in a kind of embodiment of the application;
Two kinds of circuit diagrams that Fig. 4 (a) and (b) are pixel cell in the another kind of embodiment of the application;
Two kinds of connection diagrams that Fig. 5 (a) and (b) are the feedback channel of the i-th row pixel cell in a kind of embodiment of the application;
Four kinds of connection diagrams that Fig. 6 (a), (b), (c) and (d) are the feedback channel of the i-th row pixel cell in the another kind of embodiment of the application;
Fig. 7 is the display time sequential routine figure in a kind of embodiment of the application with the display system of feedback channel.
Embodiment
By reference to the accompanying drawings the application is described in further detail below by embodiment.
Please refer to Fig. 2, the application proposes a kind of display system with feedback channel, and in one embodiment, it comprises picture element matrix 110, line scanning driver 120 and row driver 130.
Picture element matrix 110 comprises N capable M row pixel cell 10, N capable display address wire SEL [1] ~ SEL [N] and M row display signal line DATA [1] ~ DATA [M], pixel cell 10 is connected respectively with respective display address wire, display signal line, N and M is positive integer.6 pixel cells 10 have been drawn, only for signal, not by the quantity limiting pixel cell 10 in Fig. 2.
As shown in Fig. 3 (a) He (b), pixel cell 10 comprises light emitting diode OLED, for driving the driving circuit 11 of light emitting diode OLED and the switching transistor Q1 for gating pixel cell 10, wherein, the control extremely electric (i.e. grid) of switching transistor Q1 is connected to show address signals line, first pole is electrically connected to display signal line, and the second pole is electrically connected to above-mentioned driving circuit 11.Driving circuit 11 provides stable electric current to light emitting diode OLED, size of current is according to being determined by the size of the simulative display signal of display signal line writing pixel unit 10, in one embodiment, as Fig. 4 (a) and (b), driving circuit 11 comprises with driving transistors Q2 and storage capacitors C, at this moment, second pole of switching transistor Q1 is electrically connected with the control pole of driving transistors Q2.In one embodiment, pixel cell 10 can be the pixel cell of current programmed type, and its signal related to is all current signal, and namely signal is all using current value as sign; In another embodiment, pixel cell 10 can also be the pixel cell of voltage-programming type, and its signal related to is all voltage signal, and namely signal is all using magnitude of voltage as sign.Certainly, do not departing from the concept of the application, the signal in pixel cell 10 can also be other types, does not enumerate at this.
Line scanning driver 120, for sending show address signals by N capable display address alignment picture element matrix 110, with each row pixel cell 10 of gating successively in a frame, thus receives the simulative display signal that row driving 130 sends.The waveform of the show address signals that line scanning driver 120 sends can be square wave, also can be other waveforms.Concrete waveform determines according to concrete image element circuit, also may also have other control line except showing address wire.
Row driver 130 is for sending simulative display signal by M row display alignment picture element matrix 110, and this simulative display signal is used for for pixel cell 10 providing package is containing the display data of image/video information.The present embodiment simulative display signal is voltage signal, and other pixel cells also may be current signals.Row driver 130 is also for receiving the aging signal that picture element matrix 110 feeds back by display signal line.
In one embodiment, please referring back to Fig. 2, row driver 130 comprises the first shift registor 131, second shift registor 132, the 3rd shift registor 133, display generation module 134 and aging signal monitoring module 135.Digital displaying signal, the digital compensation signal of the first shift registor 131, second shift registor 132 difference serial received input, when receiving digital displaying signal and the digital compensation signal of entire row of pixels unit 10, digital displaying signal, digital compensation signal walk abreast and pass on to display generation module 134 together by the first shift registor 131, second shift registor 132, display generation module 134 exports simulative display signal once over-compensation to display signal line, thus drives pixel cell 10.In one preferably embodiment, display generation module 134 at least comprises the digital-to-analogue conversion module ADC of band Gamma correction.Aging signal monitoring module 135 is for receiving and analyze the aging signal of feedback by display signal line.In one embodiment, aging signal comprises the unequal information of original threshold voltages of driving transistors, light emitting diode OLED in driving circuit 11 in pixel cell 10; And driving transistors, light emitting diode OLED threshold voltage variation information after usage in driving circuit 11.3rd shift registor 133 for the aging signal monitoring module 135 of parallel memorizing result again Serial output give other modules, such as, export to one to calculate digital compensation signal amount module (not shown in FIG.) according to monitoring result.
In one preferably embodiment, display generation module 134 period between frames in driver, send simulative display signal through over-compensation as analog correction signal by display alignment picture element matrix 110, produce aging signal to drive pixel cell 10.In another preferably embodiment, row driver comprises correction signal generation module (not shown in FIG.), for the period between frames, send analog correction signal by display alignment picture element matrix 110, produce aging signal to drive pixel cell.
The display system with feedback channel of the application, also comprises feedback channel 20.Feedback channel 20 has first end, the second end and control end; The control end of feedback channel 20 receives gating signal, for gating feedback channel 20; The first end of feedback channel 20 is connected to driving circuit 11 or the light emitting diode OLED of a pixel cell 10, for receiving the aging signal of this pixel cell 10; It should be noted that, the first end of feedback channel 20 directly can be electrically connected on driving circuit 11 or the light emitting diode OLED of pixel cell 10, also can be indirect connection, such as, the first end of feedback channel 20 is connected to a photo-sensitive cell, change the light signal of light-emitting diodes light OLED into first end that electric signal is input to feedback channel 20 by this photo-sensitive cell, thus feedback channel 20 collects aging signal.Second end of feedback channel 20 is connected to second pole of the switching transistor Q1 of another pixel cell 10, for aging signal being outputted to when feedback channel 20 is strobed second pole of the switching transistor Q1 of this another pixel cell 10, with the display signal line be extremely connected to switching transistor Q1 first therewith by aging Signal transmissions by this switching transistor Q1, thus aging signal is transferred to row driver 130 by display signal line.In one preferably embodiment, the pixel cell 10 that feedback channel 20 first end connects, the pixel cell 10 of feedback channel 20 second end connection therewith, these two pixel cells 10 are positioned at same a line adjacent column of picture element matrix 110; In further embodiments, above-mentioned two pixel cells 10, it is positioned at the adjacent lines adjacent column of picture element matrix 110.It should be noted that, in some embodiments of the application, aging signal flows to the second end from the first end of feedback channel 20, and in other embodiment, feedback channel 20 also can be used as the signalling channel flowing to first end from its second end.
In one preferably embodiment, as shown in Fig. 5 (a), feedback channel 20 comprises a switching transistor Q3, first pole of switching transistor Q3, the second pole and control pole and be respectively the first end of feedback channel 20, the second end and control end.In one embodiment, with the feedback channel 20 of a line odd column, its control end all receives one independent of the same strobe signal of show address signals; With the feedback channel 20 of a line even column, its control end all receives another same strobe signal independent of show address signals, such as, the feedback channel 20 of the odd column of the i-th row, its control end receives the gating signal FB1 [i] independent of show address signals, the feedback channel 20 of the even column of the i-th row, its control end receives the gating signal FB2 [i] independent of show address signals.In another embodiment, as shown in Fig. 5 (b), with the feedback channel 20 of a line odd column, its control end all receives the show address signals of a non-one's own profession as gating signal, with the feedback channel 20 of a line even column, its control end all receives the show address signals of another non-one's own profession as gating signal, such as, the feedback channel 20 of the odd column of the i-th row, its control end receives the show address signals SEL [i-1] of the i-th-1 row, and the feedback channel 20 of the even column of the i-th row, its control end receives the show address signals SEL [i-2] of the i-th-2 row, in order to make as i=1, namely the control end of the feedback channel 20 of the first row also can receive show address signals, can add before the first row show address signals that the virtual show address signals line of two row is to send show address signals SEL [0] and SEL [-1] respectively.
In above-mentioned Fig. 5, the display address wire of Fig. 5 (a) and the control end of feedback channel 20 be independently signal wire mutually, namely the gating signal of feedback channel 20 is independent of show address signals, so the display operation of the picture element matrix 110 shown in Fig. 5 (a) in frame does not affect by feedback operation, feedback operation between frames, also only can affect the pixel cell 10 of one's own profession, any impact can not be produced on the pixel cell 10 of other row.
In Fig. 5 (b), when showing operation in frame, when being shown to the i-th-1 row, the odd column feedback channel 20 of the i-th row can be strobed, thus the pixel cell 10 of the even column of the i-th row stored simulative display signal polluted; The even column feedback channel 20 of the i-th+1 row can be strobed, thus the simulative display signal that the pixel cell 10 of the odd column of the i-th+1 row stores is polluted, but contaminated pixel cell maintains at most the time of 2 row, negligible on normal display impact.And in Fig. 5 (b), during feedback operation between frames, such as, when the aging signal of the pixel cell 10 of feedback i-th row odd column, first the display generation module 134 of row driving 130 sends compensated simulative display signal writes the odd column of the i-th row pixel cell 10 as analog correction signal, to produce corresponding aging signal, afterwards by the feedback channel 20 of show address signals SEL [i-1] gating i-th row odd column, go out with the aging signal transmission of above-mentioned generation; Similarly, when the aging signal of the pixel cell 10 of feedback i-th row even column, it is the feedback channel 20 by show address signals SEL [i-2] gating i-th row even column.Due in this process, employ show address signals SEL [i], SEL [i-1] and SEL [i-2], therefore, the i-th, the simulative display signal that the pixel cell 10 that i-1, i-2 are capable stores is polluted, so after finishing the feedback operation of pixel cell 10 of the i-th row, again by increasing display operation, the simulative display signal of affected i-th-2, i-1 and i capable pixel cell 10 correspondence is write back.
In further embodiments, as shown in Fig. 6 (a), feedback channel 20 comprises two switching transistors, i.e. switching transistor Q4 and switching transistor Q5, second pole of switching transistor Q4 is extremely connected with first of switching transistor Q5, first pole of switching transistor Q4, second pole of switching transistor Q5 are respectively first end, second end of feedback channel 20, and the control end of feedback channel 20 comprises the control pole of switching transistor Q4 and the control pole of switching transistor Q5.In one embodiment, with the feedback channel 20 of a line odd column, the control pole of its transistor Q4 receives the show address signals of a non-one's own profession; With the feedback channel 20 of a line even column, the control pole of its transistor Q4 receives the show address signals of another non-one's own profession, the control pole of its transistor Q5 receives the show address signals of one's own profession, such as, in one embodiment, the feedback channel 20 of the i-th row, the control pole of its transistor Q5 receives the show address signals SEL [i] of one's own profession, and the feedback channel 20 of the i-th row odd column, even column, the control pole of its transistor Q4 receives show address signals SEL [i+1], SEL [i+2] respectively.In other some embodiments, feedback channel 20 can also comprise plural switching transistor, and the gating signal of structure and control pole is similar, here repeats no more.
It should be noted that, the aging signal of the pixel cell 10 arranged to make last also can pass, can increase a display signal line DATA [M+1], feding back through of the pixel cell 10 making last arrange 20 sends aging signal to row driver 130 by this display signal line DATA [M+1].
When showing operation in frame, line scanning driver 120 is gating pixel cell 10 line by line, and the show address signals of upper and lower two row requires can not be overlapping.When display i-th row pixel cell 10, the switching transistor Q5 of the i-th row feedback channel 20 is led to by road, but now switching transistor Q4 is cut-off, so the feedback channel 20 of the i-th row can not be strobed when display operates.Switching transistor Q4 on some feedback channel 20 of now the i-th-1 row can be switched on, switching transistor Q5 on the feedback channel 20 of but the i-th-1 row is cut-off, so the feedback channel 20 of the i-th-1 row also can not be strobed, so the simulative display signal that the pixel cell 10 of the i-th-1 row stores can not be contaminated.
During feedback operation between frames, the show address signals that line scanning driver 120 needs to send the i-th row and the i-th+1 row simultaneously just can the feedback channel 20 of gating i-th row odd column, thus the aging signal transmission of the pixel cell 10 of the i-th row odd column is gone out, equally, the show address signals that line scanning driver 120 needs to send the i-th row and the i-th+2 row simultaneously just can the feedback channel 20 of gating i-th row even column, thus is gone out by the aging signal transmission of the pixel cell 10 of the i-th row even column.If in one embodiment, the show address signals of upper and lower two row occurs overlapping situation, and the show address signals of two row of being separated by is nonoverlapping, the control signal of the switching transistor Q4 of the odd column of that the i-th row, the feedback channel 20 of even column will use show address signals SEL [i+2], SEL [i+4], as shown in Fig. 6 (b) respectively.
As shown in Fig. 6 (c), the display address wire that i-th row odd column and the control of the switching transistor Q4 in the feedback channel 20 of even column extremely can also be connected i-th-1 respectively, i-2 is capable, the same Fig. 6 (a) of principle is similar, here repeat no more, it should be noted that, in order to make the feedback channel 20 of the 1st row also have corresponding display address wire to connect, two display address wires at this moment additionally can be increased.
If in one embodiment, the show address signals of upper and lower two row occurs overlapping situation, and the show address signals of two row of being separated by is nonoverlapping, the control signal of the switching transistor Q4 of the odd column of that the i-th row, the feedback channel 20 of even column just can use show address signals SEL [i-2], SEL [i-4], as shown in Fig. 6 (d) respectively.
The display system with feedback channel of the application, does display operation, does not do feedback operation in frame, and when therefore normally showing in frame, display system does not affect by the circuit that feedback is relevant.Feedback channel 20 period between frames, the aging signal of pixel cell 10 is passed to row driver 130 by the display signal line of the pixel cell 10 of adjacent column.
The above-mentioned transistor related to, can adopt amorphous silicon, polysilicon, oxide semiconductor, organic semiconductor, NMOS/PMOS technique or CMOS technology to manufacture.
Below the principle of work with the display system of feedback channel of the application is described.
The course of work with the display system of feedback channel is divided into the display in frame to operate, and the feedback operation in blank time section between frame and frame.Please refer to Fig. 7, might as well N=768 be made, M=1024.Display address wire SEL [1] ~ SEL [768], be respectively used to the pixel cell 10 of gating 1st ~ 768 row, display signal line DATA [1] ~ DATA [1024], be respectively used to send simulative display signal to the pixel cell 10 of 1st ~ 1024 row, or receive the aging signal of feedback.In order to make the aging signal of last row pixel cell 10 also can be sent, additionally a display signal line DATA [1025] can also be increased.In figure, L1 represents all pixel cells 10 of the 1st row by the simulative display signal after compensating, namely signal L1 contains the simulative display signal of display signal line DATA [1] to display signal line DATA [1024], L2 represents all pixel cells 10 of the 2nd row by the simulative display signal after compensating, the like, L768 represents all pixel cells 10 of the 768th row by the simulative display signal after compensating.It should be noted that, only depict the display operation in frame in Fig. 7, the feedback operation of the blank interval between frame and frame is not and draw.
Display operation in frame: at the present embodiment, pixel cell 10 is gatings when display address wire is high level, line scanning driver 120 is by display address wire SEL [1] ~ SEL [768], from the 1st row, the each pixel cell 10 of gating successively in order, after the complete last column of the line scanning driver 120 gating i.e. pixel cell 10 of the 768th row, can be one section of blank interval between frame and frame, start again the 1st row pixel cell sweeping lower frame afterwards.The every gating one-row pixels unit 10 of line scanning driver 120, row driver 130 will accordingly by compensated simulative display Signal transmissions on display signal line.Simulative display signal on display signal line is maintained to line scanning driver 120 ends this row pixel cell 10 of gating to I haven't seen you for ages.
Feedback operation between frame and frame: in the display operating process in frame, feedback channel 20 cannot pass the signal along to display signal line, that is, the existence of feedback channel 20, can not affect normal display.Blank interval between frames, when needing to do feedback operation, line scanning driver 120 first sends the pixel cell 10 of show address signals gating target line, row driver 130 exports compensated simulative display signal by the display generation module 134 that odd number arranges to the pixel cell 10 that odd number arranges and is used for driving pixel cell 10 to produce aging signal as analog correction signal, not (namely now the display generation module 134 of even column does not export simulative display signal) of the now disabled status of the display generation module 134 of even column, with the time or afterwards, the feedback channel 20 of gating odd column, the feedback channel 20 of even column is then in cut-off state.As mentioned above, the gating signal of feedback channel 20 can be independent of show address signals, also can be show address signals.The aging signal of pixel cell 10 generation of odd column then can be relayed to second pole of the switching transistor Q1 of the pixel cell 10 of even column by the feedback channel 20 of odd column, by this switching transistor Q1, aging signal is outputted to the display signal line of the first even column be extremely connected with this switching transistor Q1 again, finally aging signal is passed on to the aging signal monitoring module 135 of row driver 130.Because display signal line is in succession display generation module 134 and aging signal monitoring module 135 simultaneously, therefore, in feedback operation process, the display generation module 134 be connected with odd column display signal line, aging signal monitoring module 135 is be in initiate mode respectively, disabled status (namely not carrying out the activity receiving aging signal), the display generation module 134 be connected with even column display signal line, aging signal monitoring module 135 is be in disabled status (namely not carrying out the activity of the simulative display signal produced through over-compensation) respectively, initiate mode.Finish the feedback operation of this journey odd column pixel unit, just start the feedback operation doing this journey biserial pixel cell.Way is the same, the display generation module 134 be only now connected with odd column display signal line, aging signal monitoring module 135 are be in disabled status, initiate mode respectively, and the display generation module 134 be connected with even column display signal line, aging signal monitoring module 135 are be in initiate mode, disabled status respectively.Can see, have a row display signal line DATA [M+1] to feed back aging signal use to right column (i.e. last row) pixel cell 10 specially at the rightmost of this display system picture element matrix 110, namely the second end of the feedback channel 20 of the pixel cell 10 of right column is connected on rightmost that row display signal line DATA [M+1] more additional than normal display system.When after the feedback operation of pixel cell 10 processing odd column and even column, the display data of influenced row can be write back to inside pixel cell 10 by extra display operation and go by display system, such as, in Fig. 6 (a), when carrying out the feedback operation of the i-th row pixel cell 10, now the gating signal of feedback channel 20 comprises SEL [i], SEL [i+1] and SEL [i+2], therefore affected behavior i-th, the pixel cell 10 that i+1 and i+2 is capable, therefore after the pixel cell 10 of the i-th row has carried out feedback operation, by extra display operation, corresponding simulative display signal is written to i-th respectively again, in the pixel cell 10 that i+1 and i+2 is capable
The display system of the feedback channel in the application's the various embodiments described above, the first end due to feedback channel 20 is connected to driving circuit 11 or the light emitting diode OLED of a pixel cell 10, for receiving the aging signal of this pixel cell 10, second end of feedback channel 20 is connected to second pole of the switching transistor Q1 of another pixel cell 10, for aging signal being outputted to when feedback channel 20 is strobed second pole of the switching transistor Q1 of this another pixel cell 10, with the display signal line aging Signal transmissions is extremely connected to switching transistor Q1 first therewith by this switching transistor Q1, thus aging signal is transferred to row driver 130 by display signal line, therefore the output terminal of feedback channel 20 is not be directly connected on display signal line, so both achieved the aging signal of feedback, do not increase again the load of display signal line.Simultaneously, due to feedback channel 20 period between frames, the aging signal of pixel cell 10 is passed to row driver 130 by the display signal line of the pixel cell 10 of adjacent column, therefore not only can not affect the display operation in frame, and improve the speed feeding back aging signal.
Above content is the further description done the application in conjunction with concrete embodiment, can not assert that the concrete enforcement of the application is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite not departing from the present application design, some simple deduction or replace can also be made.
Claims (12)
1. there is a display system for feedback channel, comprising:
Pixel cell, described pixel cell comprises light emitting diode, for driving the driving circuit of described light emitting diode and the switching transistor for pixel cell described in gating; Wherein, the control pole of switching transistor is electrically connected to show address signals line, and the first pole is electrically connected to display signal line, and the second pole is electrically connected to described driving circuit;
It is characterized in that, also comprise:
Feedback channel, has first end, the second end and control end; The control end of described feedback channel receives gating signal, for feedback channel described in gating; The first end of described feedback channel is connected to driving circuit or the light emitting diode of a pixel cell, for receiving the aging signal of this pixel cell; Second end of described feedback channel is connected to the second pole of the switching transistor of another pixel cell, for aging signal being outputted to when described feedback channel is strobed switching transistor second pole of another pixel cell described, with the display signal line described aging Signal transmissions is extremely connected to switching transistor first therewith by this switching transistor, thus aging signal is transferred out by display signal line.
2. there is the display system of feedback channel as claimed in claim 1, it is characterized in that, also comprise:
Picture element matrix, described picture element matrix comprise the capable M of N arrange described pixel cell, N capable described in show address wire and M arranges described display signal line, pixel cell is connected respectively with respective display address wire, display signal line, N and M is positive integer;
Line scanning driver, for sending show address signals by display address alignment picture element matrix, with each row pixel cell of gating successively in a frame;
Row driver, for sending simulative display signal by display alignment picture element matrix, described simulative display signal is used for for pixel cell providing package is containing the display data of image/video information; And, for being received the aging signal of picture element matrix feedback by display signal line.
3. have the display system of feedback channel as claimed in claim 1, it is characterized in that, the pixel cell that described feedback channel first end connects, the pixel cell of feedback channel second end connection therewith, it is positioned at same a line adjacent column of picture element matrix; Or it is positioned at the adjacent lines adjacent column of picture element matrix.
4. the display system with feedback channel as described in claim 1 or 3, is characterized in that:
Described feedback channel comprises a switching transistor, the first pole of described switching transistor, the second pole and control pole and be respectively the first end of described feedback channel, the second end and control end.
5. there is the display system of feedback channel as claimed in claim 4, it is characterized in that:
With the feedback channel of a line odd column, its control end all receives one independent of the same strobe signal of show address signals; With the feedback channel of a line even column, its control end all receives another same strobe signal independent of show address signals;
Or,
With the feedback channel of a line odd column, its control end all receives the show address signals of a non-one's own profession as gating signal; With the feedback channel of a line even column, its control end all receives the show address signals of another non-one's own profession as gating signal.
6. the display system with feedback channel as described in claim 1 or 3, is characterized in that:
Described feedback channel comprises at least the first switching transistor and second switch transistor, second pole of described first switching transistor is extremely connected with first of second switch transistor, first pole of described first switching transistor, the second pole of second switch transistor are respectively first end, second end of described feedback channel, and the control end of described feedback channel comprises the control pole of the first switching transistor and the control pole of second switch transistor.
7. there is the display system of feedback channel as claimed in claim 6, it is characterized in that:
With the feedback channel of a line odd column, the control pole of its first transistor receives the show address signals of a non-one's own profession, and the control pole of its transistor seconds receives the show address signals of one's own profession; With the feedback channel of a line even column, the control pole of its first transistor receives the show address signals of another non-one's own profession, and the control pole of its transistor seconds receives the show address signals of one's own profession.
8. there is the display system of feedback channel as claimed in claim 1, it is characterized in that, described aging signal comprises the unequal information of original threshold voltages of driving transistors, light emitting diode in driving circuit in pixel cell, and driving transistors, light emitting diode threshold voltage variation information after usage in driving circuit.
9. there is the display system of feedback channel as claimed in claim 1, it is characterized in that, the described feedback channel period between frames, the aging signal of pixel cell is passed to described row driver by the display signal line of the pixel cell of adjacent column.
10. there is the display system of feedback channel as claimed in claim 9, it is characterized in that, described row driver comprises display generation module/correction signal generation module, for the period between frames, send the simulative display signal/analog correction signal through over-compensation by display alignment picture element matrix, produce aging signal to drive pixel cell.
11. display systems as claimed in claim 9 with feedback channel, it is characterized in that, described row driver comprises aging signal monitoring module, for being received and analyze the aging signal of feedback by display signal line.
12. display systems as claimed in claim 1 with feedback channel, it is characterized in that, described pixel cell is the pixel cell of current programmed type or voltage-programming type.
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| CN201510618674.2A CN105206224B (en) | 2015-09-24 | 2015-09-24 | A kind of display system with feedback channel |
| PCT/CN2015/095522 WO2017049756A1 (en) | 2015-09-24 | 2015-11-25 | Display system having feedback channel |
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| CN201510618674.2A CN105206224B (en) | 2015-09-24 | 2015-09-24 | A kind of display system with feedback channel |
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| WO2017049756A1 (en) | 2017-03-30 |
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