CN202584687U - Data driving circuit of micro-current type active matrix organic light emitting diode (AMOLED) display - Google Patents
Data driving circuit of micro-current type active matrix organic light emitting diode (AMOLED) display Download PDFInfo
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- CN202584687U CN202584687U CN2012201197013U CN201220119701U CN202584687U CN 202584687 U CN202584687 U CN 202584687U CN 2012201197013 U CN2012201197013 U CN 2012201197013U CN 201220119701 U CN201220119701 U CN 201220119701U CN 202584687 U CN202584687 U CN 202584687U
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Abstract
The utility model discloses a data driving circuit of a micro-current type active matrix organic light emitting diode (AMOLED) display, comprising a shift register, a latch, a current source circuit, a line scanning circuit and a pixel array, wherein the input signal of the shift register comprises a video data signal and a shift clock signal; the output of the shift register and the external line synchronizing signal are respectively the input signals of the latch; the output of the latch is the input signal of the current source circuit; the input of the line scanning circuit comprises the line synchronizing signal and the frame synchronizing signal; and the output of the current source circuit and the output the line scanning circuit are respectively the input signals of the pixel array.
Description
Technical field
The utility model relates to a kind of little current mode AMOLED display data driving circuit, belongs to microelectronics and display technique field.
Background technology
Little display technique is international emerging technology and industry, and its following application is immeasurable.Its purposes is wide, relates to industry-by-industry and fields such as scientific research, amusement, communication, military affairs, medical treatment, and market potential is huge.For other little display techniques, the little demonstration of active organic LED (AMOLED) has characteristics such as active illuminating, visual angle are wide, low-voltage driving, luminescence efficiency is high, response speed is fast, can be used for various demonstrations field.The combination of organic luminescent device OLED technology and complementary oxide semiconductor CMOS technology has promoted the development of miniscope of new generation.Organic luminescent device OLED is directly done on the IC chip of single crystal silicon material, adopt at present popular CMOS technological design processing, thereby constituted the cheaper miniscope system of a kind of total cost.AMOLED will reach practicability, must have one perfect, the driving circuit of practicability.Few and the integrated level of chip for driving is low to be to design the very big problem that the AMOLED driving circuit runs at present.The research of the drive system of AMOLED is in developing stage, and its drive system part of theoretical study is one of focus of present AMOLED area research in the world, also is that forward position, China AMOLED field one of studies a question.
Active organic LED (AMOLED) is divided into voltage once-type and electric current once-type.Organic luminescent device OLED is the active illuminating device, and brightness is directly proportional with injection current, so the normal current drives that adopts.As long as it is a constant that the electric current of each organic luminescent device OLED is flow through in assurance, just can guarantee that its brightness is consistent.Thereby can eliminate because of the caused display brightness non-uniformity problem of ito anode resistance drop, display quality is improved.
For M * N (M is the display screen columns, and N is the display screen line number) gray shade scale is the AMOLED display screen of K, mainly contains three kinds of frequency of operation: frame rate f
F, row drives frequency of operation f
r, row drive frequency of operation f
LThe relation of these three kinds of frequency of operation is: f
L=M * N * f
FAnd f
r=N * f
F, each pixel duration of charging is 1/K * N * f
F, organic luminescent device OLED pixel driving current is very little, if the image element circuit duration of charging falls short of the insufficient distortion that will produce image of OLED device charging.
Summary of the invention
The purpose of the utility model is in order to solve current mode active organic LED (AMOLED) display picture element circuit current charges short problem Time Created; A kind of little current mode AMOLED display data driving circuit is provided; Can increase image element circuit Time Created, the image element circuit current charging time is increased.Improved the insufficient problem that will produce image fault of organic luminescent device OLED charging.
For realizing the utility model purpose, adopt following technical scheme:
A kind of little current mode AMOLED display data driving circuit; It is characterized in that: comprise shift register, latch, current source circuit, line-scan circuit and pel array; The input signal of shift register is respectively video data signal and shift clock signal; The output of shift register and external line synchronizing signal are respectively the input signal of latch; Latch is output as the input signal of current source circuit, line-scan circuit be input as line synchronizing signal and frame synchronizing signal, the output of current source circuit and the output of line-scan circuit are respectively the input signal of pel array;
Shift register comprises 4 groups of inputs of running simultaneously, the d type flip flop of every group of 320 serially concatenateds; The input termination of first d type flip flop receives the viewdata signal of 4bit position from decoding deck; The output terminal of first d type flip flop of input termination of second d type flip flop; By that analogy, the output terminal of the 319th d type flip flop of input termination of the 320th d type flip flop; The clock control termination pixel shift clock of 320 d type flip flops;
Latch comprises 4 groups of inputs of running simultaneously, the d type flip flop of every group of 320 serially concatenateds; The output terminal of first d type flip flop of input termination shift register of first d type flip flop; The output terminal of second d type flip flop of input termination shift register of second d type flip flop; By that analogy, the output terminal of the 320th d type flip flop of input termination shift register of the 320th d type flip flop; The clock control termination line synchronizing signal of 320 d type flip flops;
Line-scan circuit comprises the d type flip flop of 240 serially concatenateds;
Pel array comprises 320 row * 240 a row organic luminescent device OLED pixel unit circuit;
Current source circuit contains 320 P type metal-oxide-semiconductor M1, M2, M3 ... M320,640 N type metal-oxide-semiconductor N1, N2, N3, N4, N5, N6 ... N640,320 K switch 1, K2, K3 ... K320,4 switch D0, D1, D2, D3 and current source Iout; The grid of the grid of the grid of the grid of the forward end of current source Iout and P type metal-oxide-semiconductor M1 and drain electrode, P type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3, P type metal-oxide-semiconductor M4 ... Until the grid of P type metal-oxide-semiconductor M320 interconnects the negative end ground connection of current source Iout; The source electrode of the source electrode of the source electrode of the source electrode of P type metal-oxide-semiconductor M1, P type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3, P type metal-oxide-semiconductor M4 ..., until the source electrode of P type metal-oxide-semiconductor M320 interconnects and connects power vd D; 640 N type metal-oxide-semiconductors in order two be one group; Totally 320 groups, N type metal-oxide-semiconductor N1, N3, the N5 of the odd number in every group ... The grid of N639 and drain electrode all with on the same group in N type metal-oxide-semiconductor N2, N4, the N6 of even number ... The grid of N640 connect and respectively with 320 P type metal-oxide-semiconductors in the drain electrode of M2～M320 link together; The source electrode of 640 N type metal-oxide-semiconductors is all received power supply ground, the N type metal-oxide-semiconductor N2 of even number, N4, N6 ... The drain electrode of N640 connects K switch 1, K2, K3 respectively ... The end of K320; K switch 1, K2, K3 ... The other end of K320 connects each row pixel cell respectively; Said current source Iout is external reference current Iref, external reference current Iref/2, external reference current Iref/4 and external reference current Iref/8 four road electric current sums, and external reference current Iref, external reference current Iref/2, external reference current Iref/4 and external reference current Iref/8 connect current source Iout through switch D0, D1, D2 and D3 respectively.
Advantage of the utility model and remarkable result:
(1) the utility model adopts current source circuit, directly utilizes current mirror for organic luminescent device OLED provides electric current, has increased image element circuit Time Created, makes each pixel duration of charging by 1/K * N * f
FBe extended for 1/N * f
F, image element circuit prolongs K doubly Time Created, and display quality improves, and has solved the problem of insufficient generation image fault because the OLED device current is charged.
(2) utilize current drives can realize the homogeneity of active organic LED (AMOLED) display brightness and the accuracy adjusting of display gray scale.
Description of drawings
Fig. 1 is that the utility model current mode AMOLED drives the display system block diagram;
Fig. 2 is the utility model current source circuit figure;
Fig. 3 is the utility model reference current source Iout circuit diagram;
Fig. 4 is the utility model circuit control timing figure.
Embodiment
Referring to Fig. 1-3, the utility model comprises shift register 1, latch 2, current source circuit 3, line-scan circuit 4, pel array 5.Shift register 1 is made up of 4 groups every group 320 d type flip flop cascades.Latch 2 is made up of 4 groups every group 320 d type flip flop cascades equally, has the temporary effect of data.Electric current source generating circuit 3 contains 320 P type metal-oxide-semiconductor M1, M2, M3 ... M320; 640 N type metal-oxide-semiconductor N1, N2, N3, N4, N5, N6 ... N640 and K switch 1, K2, K3 ... K320, D0, D1, D2, D3, current source Iout; Current source Iout is external reference current Iref; External reference current Iref/2, external reference current Iref/4, external reference current Iref/8 four road electric current sums.Control D0, D1, D2, four switches of D3 respectively from 320 tunnel 4 signals that latch receives, produce 320 road electric currents and be input in the pel array.Line-scan circuit 4 forms through one group of d type flip flop cascade, when each line synchronizing signal arrives, is shifted, and chooses the next line pixel matrix.Pel array 5 is made up of 320 * 240 OLED image element circuits, will be luminous when the OLED device has electric current to flow through.
The input end of the output terminal of shift register 1 and latch 2 interconnects; The input end of the output terminal of latch 2 and electric current source generating circuit 3 interconnects; An input end of the output terminal of electric current source generating circuit 3 and pel array 5 interconnects; Another input end of line-scan circuit 4 and pel array links to each other.The forward end of current source Iout, grid and the drain electrode of P type metal-oxide-semiconductor M1, the grid of P type metal-oxide-semiconductor M2, the grid of P type metal-oxide-semiconductor M2, the grid of P type metal-oxide-semiconductor M4 is until the grid of P type metal-oxide-semiconductor M320 is interconnected in first node A1; The source electrode of P type metal-oxide-semiconductor M1, the source electrode of P type metal-oxide-semiconductor M2, the source electrode of P type metal-oxide-semiconductor M2, the source electrode of P type metal-oxide-semiconductor M4 is until the source electrode of P type metal-oxide-semiconductor M320 is interconnected in power vd D; The negative end ground connection of current source Iout; Grid and the drain electrode of N type metal-oxide-semiconductor N1, the grid of N type metal-oxide-semiconductor N2, the drain electrode of P type metal-oxide-semiconductor M2 is interconnected in Section Point A2; The source electrode of N type metal-oxide-semiconductor N1, the source electrode of N type metal-oxide-semiconductor N2, the source electrode of N type metal-oxide-semiconductor N3, the source electrode of N type metal-oxide-semiconductor N4, the source electrode of N type metal-oxide-semiconductor N5, the source electrode of N type metal-oxide-semiconductor N6 is until the source electrode of N type metal-oxide-semiconductor N640 is all received power supply ground; Grid and the drain electrode of N type metal-oxide-semiconductor N3, the grid of N type metal-oxide-semiconductor N4, the drain electrode of P type metal-oxide-semiconductor M3 is interconnected in the 3rd node A3; Grid and the drain electrode of N type metal-oxide-semiconductor N5, the grid of N type metal-oxide-semiconductor N6, the drain electrode of P type metal-oxide-semiconductor M4; Be interconnected in the 4th node A4 ... Grid and the drain electrode of N type metal-oxide-semiconductor N639, the grid of N type metal-oxide-semiconductor N640; The drain electrode of P type metal-oxide-semiconductor M320 is interconnected in the 5th node A5; The drain electrode of N type metal-oxide-semiconductor N2 links to each other with K switch 1; The drain electrode of N type metal-oxide-semiconductor N4 links to each other with K switch 2; The drain electrode of N type metal-oxide-semiconductor N6 links to each other with K switch 3; The drain electrode of N type metal-oxide-semiconductor N640 links to each other with K switch 320; K switch 1, K2, K3 ... K320 connects pixel cell; Current source Iout is external reference current Iref, external reference current Iref/2, external reference current Iref/4, external reference current Iref/8 four road electric current sums.External reference current Iref links to each other with switch D0; Reference current Iref/2 links to each other with switch D1; Reference current Iref/4 links to each other with switch D2; Reference current Iref/8 links to each other with switch D3.
The utility model shift register receives viewdata signal from decoding deck; The shift clock rising edge external through shift register triggers, and viewdata signal is shifted to the other end from an end of shift register successively, the rising edge of a shift clock of every reception; Shift register is accomplished the displacement of bit image data; When accomplishing all displacements, latch is imported through external line synchronizing signal, the whole input latches of the view data in the shift register and deposit; Current source circuit receives the signal of depositing in the latch; Control the switch of each row current source circuit, the electric current of generation is input to pel array after current mirror duplicates, directly to the pixel cell in the pel array--and the charging of active organic LED circuit; The image element circuit current charging time is increased, and line-scan circuit produces line scan signals and chooses the active organic LED display line that requirement is lighted in the pel array line by line.
The course of work of circuit shown in Figure 1 is following:
Shift register receives the viewdata signal Data of 4bit position from decoding deck; Pixel shift clock pixclk rising edge through shift register triggers; Data is successively from the left end right shift of shift register; Line synchronizing signal HS arrives when accomplishing 320 displacements, all is input to the data in the shift register latch 2 and is deposited with in the latch.While electric current source generating circuit 3 produces 320 road electric currents respectively through 320 tunnel 4 signals that receive from latch respectively and is input to the image element circuit 5.Line-scan circuit through left end 4 realizes the conducting of related switch pipe in the pixel cell with external control circuit and cuts out simultaneously.Becoming electric signal to be stored in the pixel cell and to image element circuit with regard to the data-switching that can will read in from the top like this charges.Be illustrated in figure 4 as circuit control timing figure of the present invention.
The course of work of Fig. 2 and circuit shown in Figure 3 is following:
Be illustrated in figure 2 as 320 current mirror partial circuit figure.Producing 320 road electric currents is input in the pel array.Like Fig. 3 four road reference currents are arranged, control D0, D1, D2, four switches of D3 respectively from 320 tunnel 4 signals that latch receives, four road electric current sums are the OLED drive current.Each road produces 320 row electric currents with 320 current mirrors.
For the AMOLED display screen of M * N, frame rate f
FIf gray shade scale is K, each image element circuit duration of charging is 1/K * N * f
FFor the present invention, frame frequency is 180HZ, and gray shade scale is 16, adopts 320 current mirrors to make each image element circuit duration of charging by 1/K * N * f
F=1/16 * 240 * 180=1.45us is extended for 1/N * f
F=1/240 * 180=23us makes the duration of charging prolong 16 times.
Be illustrated in figure 4 as the sequential relationship between the external control signal.The cycle of frame synchronizing signal is 320 times of line synchronizing signal, and the cycle of line synchronizing signal is 240 times of pixel clock cycle.
Claims (1)
1. little current mode AMOLED display data driving circuit; It is characterized in that: comprise shift register, latch, current source circuit, line-scan circuit and pel array; The input signal of shift register is respectively video data signal and shift clock signal; The output of shift register and external line synchronizing signal are respectively the input signal of latch; Latch is output as the input signal of current source circuit, line-scan circuit be input as line synchronizing signal and frame synchronizing signal, the output of current source circuit and the output of line-scan circuit are respectively the input signal of pel array;
Shift register comprises 4 groups of inputs of running simultaneously, the d type flip flop of every group of 320 serially concatenateds; The input termination of first d type flip flop receives the viewdata signal of 4bit position from decoding deck; The output terminal of first d type flip flop of input termination of second d type flip flop; By that analogy, the output terminal of the 319th d type flip flop of input termination of the 320th d type flip flop; The clock control termination pixel shift clock of 320 d type flip flops;
Latch comprises 4 groups of inputs of running simultaneously, the d type flip flop of every group of 320 serially concatenateds; The output terminal of first d type flip flop of input termination shift register of first d type flip flop; The output terminal of second d type flip flop of input termination shift register of second d type flip flop; By that analogy, the output terminal of the 320th d type flip flop of input termination shift register of the 320th d type flip flop; The clock control termination line synchronizing signal of 320 d type flip flops;
Line-scan circuit comprises the d type flip flop of 240 serially concatenateds;
Pel array comprises 320 row * 240 a row organic luminescent device OLED pixel unit circuit;
Current source circuit contains 320 P type metal-oxide-semiconductor M1, M2, M3 ... M320,640 N type metal-oxide-semiconductor N1, N2, N3, N4, N5, N6 ... N640,320 K switch 1, K2, K3 ... K320,4 switch D0, D1, D2, D3 and current source Iout; The grid of the grid of the grid of the grid of the forward end of current source Iout and P type metal-oxide-semiconductor M1 and drain electrode, P type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3, P type metal-oxide-semiconductor M4 ... Until the grid of P type metal-oxide-semiconductor M320 interconnects the negative end ground connection of current source Iout; The source electrode of the source electrode of the source electrode of the source electrode of P type metal-oxide-semiconductor M1, P type metal-oxide-semiconductor M2, P type metal-oxide-semiconductor M3, P type metal-oxide-semiconductor M4 ..., until the source electrode of P type metal-oxide-semiconductor M320 interconnects and connects power vd D; 640 N type metal-oxide-semiconductors in order two be one group; Totally 320 groups, N type metal-oxide-semiconductor N1, N3, the N5 of the odd number in every group ... The grid of N639 and drain electrode all with on the same group in N type metal-oxide-semiconductor N2, N4, the N6 of even number ... The grid of N640 connect and respectively with 320 P type metal-oxide-semiconductors in the drain electrode of M2～M320 link together; The source electrode of 640 N type metal-oxide-semiconductors is all received power supply ground, the N type metal-oxide-semiconductor N2 of even number, N4, N6 ... The drain electrode of N640 connects K switch 1, K2, K3 respectively ... The end of K320; K switch 1, K2, K3 ... The other end of K320 connects each row pixel cell respectively; Said current source Iout is external reference current Iref, external reference current Iref/2, external reference current Iref/4 and external reference current Iref/8 four road electric current sums, and external reference current Iref, external reference current Iref/2, external reference current Iref/4 and external reference current Iref/8 connect current source Iout through switch D0, D1, D2 and D3 respectively.
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| CN2012201197013U CN202584687U (en) | 2012-03-27 | 2012-03-27 | Data driving circuit of micro-current type active matrix organic light emitting diode (AMOLED) display |
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| CN2012201197013U CN202584687U (en) | 2012-03-27 | 2012-03-27 | Data driving circuit of micro-current type active matrix organic light emitting diode (AMOLED) display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788514A (en) * | 2014-12-23 | 2016-07-20 | 昆山国显光电有限公司 | Gamma voltage regulating circuit and method for driving chip, and AMOLED display |
| CN106652888A (en) * | 2016-11-28 | 2017-05-10 | 深圳市富满电子集团股份有限公司 | LED display screen and scanning control circuit thereof |
| TWI701648B (en) * | 2019-08-06 | 2020-08-11 | 大陸商北京集創北方科技股份有限公司 | LED display drive circuit, LED drive current modulation method, and LED display |
-
2012
- 2012-03-27 CN CN2012201197013U patent/CN202584687U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105788514A (en) * | 2014-12-23 | 2016-07-20 | 昆山国显光电有限公司 | Gamma voltage regulating circuit and method for driving chip, and AMOLED display |
| CN106652888A (en) * | 2016-11-28 | 2017-05-10 | 深圳市富满电子集团股份有限公司 | LED display screen and scanning control circuit thereof |
| TWI701648B (en) * | 2019-08-06 | 2020-08-11 | 大陸商北京集創北方科技股份有限公司 | LED display drive circuit, LED drive current modulation method, and LED display |
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Granted publication date: 20121205 Termination date: 20130327 |