CN101261810A - A pixel driving circuit in silicon base organic luminescent display device - Google Patents
A pixel driving circuit in silicon base organic luminescent display device Download PDFInfo
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- CN101261810A CN101261810A CNA200810036364XA CN200810036364A CN101261810A CN 101261810 A CN101261810 A CN 101261810A CN A200810036364X A CNA200810036364X A CN A200810036364XA CN 200810036364 A CN200810036364 A CN 200810036364A CN 101261810 A CN101261810 A CN 101261810A
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- 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
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0857—Static memory circuit, e.g. flip-flop
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0871—Several active elements per pixel in active matrix panels with level shifting
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention relates to a pixel driving circuit in a silica-based organic luminous display, which is a pixel driving circuit that an input electricity is connected with a column scan line, a row scan line and a data line while an output electricity is connected with a diode, wherein the pixel driving circuit is connected with a pixel driving circuit with a constant current source through a level shifter circuit by a binary latch; the binary latch is used for gate of column and row data of the display equipment; the pixel driving circuit with the constant current source is used for providing current with fixed amplitude for an organic light emitting diode under pixel gate condition to allow organic light emitting diode to light, and change the intensity according to duty ratio of data provided by the data line; the level shifter circuit is used for high and low level shifting between the binary latch and the pixel driving circuit with the constant current source; the pixel driving circuit transmits data on a data line to the pixel driving circuit according to a column scan line and a row scan line, which results in gray-scale display of the organic light emitting diode. The whole pixel driving circuit of the invention adopts a transistor for charge and discharge instead of a traditional capacitor, thus the aperture ratio of the pixel circuit is significantly improved; through the constant current provided by a quiescent current source, the current passing under operating condition of the organic light emitting diode can be accurately controlled and not influenced by a threshold voltage.
Description
Technical field
The present invention particularly connects a pixel-driving circuit that constant current source pixel-driving circuit constituted by a binary latch through level shifting circuit about a kind of about the pixel-driving circuit in a kind of silicon base organic luminescent display device (OLED-on-Silicon) (Pixel Circuit).
Background technology
Silicon base organic luminescent display device is luminescent device with the organic light emitting diode, and with switch module or the driven unit of complementary metal oxide semiconductor (CMOS) as organic light emitting diode, include source pixel driving, line-scanning drive circuit, column scan driving circuit and necessary control circuit, purpose is in order to reduce the System on Chip/SoC sum and to reduce cost as far as possible.
Organic light emitting diode and liquid crystal display (Liquid Crystal Display, LCD) compare, have all solid stately, technology is simple, low voltage drive, low-power consumption, low cost, fast-response speed, autoluminescence, wide visual angle, advantages such as soft screen demonstration, so oganic light-emitting display device will progressively replace liquid crystal display and become main flow undisputed on the market.Be mainly used in the nearly eye display device, in video camera, view finder and other portable equipments.Organic light emitting diode is a current driving apparatus, current drives download stream son inject and the compound organic material that causes luminous, so its brightness and by electric current by closely related.Yet the electric current regular meeting that passes through is subjected to the influence of complementary metal oxide semiconductor (CMOS) threshold voltage shift.
Please refer to Fig. 1 is the voltage driven type two pipe image element circuits of a routine, and it comprises: an organic light emitting diode OLED11, a PMOS12, a NMOS14 and a memory capacitance 13.Wherein the grid of NMOS14 and drain electrode are electrically connected to sweep trace 15 and data line 16 respectively, the grid of PMOS12 is electrically connected the source electrode of NMOS14 and an electrode of memory capacitance 13, another electrode of the source electrode of PMOS12 and memory capacitance 13 is electrically connected to supply voltage VDD simultaneously, and the drain electrode of PMOS12 is electrically connected to the anode of organic light emitting diode OLED11, the plus earth of OLED11.
Conventional voltage driven type two pipe image element circuit principles are as described below.At first, when sweep trace 15 was in low level, NMOS14 disconnected, and pixel is in non-selected state.Secondly, when sweep trace 15 provided high level, this pixel was selected, and NMOS14 is as switch conduction, and data line 16 writes the grid of voltage data to PMOS12 by NMOS14, and memory capacitance 13 works simultaneously.When data line 16 is low level, memory capacitance 13 chargings; When data line 16 was high level, the electric charge on the memory capacitance continued to keep the grid voltage of PMOS12, made it remain on the saturation conduction state.Therefore, in the cycle, the grid voltage of PMOS12 is constant in entire frame, and OLED11 is constant current control, and Organic Light Emitting Diode OLED11 is luminous.At this moment, flow through and keep relation between the voltage of the electric current of OLED11 and PMOS12:
I
d＝0.5UpCox(W/L)(V
SG-|V
THP|)
2
Here V
SD＞V
SG-| V
TH|; V
SG＞| V
THP| in the formula: W/L is the breadth length ratio of PMOS driving tube 12.I
dThe electric current of OLED11, V are flow through in representative
SGRepresent the source electrode of PMOS12 and the voltage difference between the grid, V
THPRepresent the threshold voltage of PMOS12.
As can be seen, the electric current that flows through PMOS12 and OLED11 is the gate source voltage V corresponding to PMOS12
SGValue, and OLED11 continues luminosity corresponding to this current value.V
SGThen, play the data storage effect, make the grid voltage of PMOS12 keep stable, produce one by OLED11 fixed size electric current I owing to memory capacitance 13 pixel selected states are following corresponding to the voltage on the data line 16 under the NMOS14 conducting state
d, make this organic light emitting diode luminosity keep stable.After choosing sweep trace 15, the voltage on the data line 16 is written to pixel OLED11 inside, and this organic light emitting diode brightness remains unchanged, up to have data to write next time.Show if will realize multi-stage grey scale, then the multi-stage grey scale voltage on the control data line 16.
Yet it is very difficult that conventional voltage driven type image element circuit realizes that senior gray scale shows, this is owing to problems such as technology manufacturings, even between the different pixels on the same substrate, and the threshold voltage V between the same type transistor
THAlso can change, the electric current that causes flowing through organic light emitting diode has very big variation with different pixels, thereby makes by the electric current instability of Organic Light Emitting Diode, is difficult to realize that the control gray scale shows.The technology manufacturing can bring the inconsistent of carrier mobility equally, brings influence further for the brightness irregularities of display screen matrix.
Summary of the invention
In view of the above problems, the purpose of this invention is to provide a kind of based on the pixel-driving circuit in the silicon base organic luminescent display device, provide the fixed size electric current by the quiescent current source, the electric current that makes Organic Light Emitting Diode pass through down in working order is precisely controlled, be not subjected to the influence of threshold voltage, simultaneously the duty of the data that provide according to data line is recently controlled the gray scale of Organic Light Emitting Diode.
For achieving the above object, the present invention adopts following technical proposals:
Pixel-driving circuit in a kind of silicon base organic luminescent display device, be that an input is electrically connected horizontal scanning line, column scan line and data line and exports the pixel-driving circuit that is electrically connected a diode, it is characterized in that described pixel-driving circuit connects a constant current source pixel-driving circuit by a binary latch through level shifting circuit; Described binary latch has been used for display device raw column data gate action; Described constant current source pixel-driving circuit is used under the pixel strobe state, provides amplitude fixed-size electric current to Organic Light Emitting Diode, makes it luminous, and the dutycycle of the data that provide according to data line changes its brightness; Described level shifting circuit is used for rising a kind of high-low level transformation between binary latch and constant current source pixel-driving circuit; Described pixel-driving circuit, according to a horizontal scanning line and column scan line with the data transmission on the data line to pixel-driving circuit, make the Organic Light Emitting Diode gray scale show.
The input of above-mentioned binary latch is electrically connected on a horizontal scanning line, a column scan line and a data line, and its output control Organic Light Emitting Diode is bright dark, this binary latch includes 12 metal-oxide-semiconductors: (1) the one PMOS, its three very first grid, first source electrode and first drain electrodes, wherein this first source electrode is electrically connected on low voltage level; (2) the 2nd PMOS, its three very second grid, second source electrode and second drain electrodes, wherein this second source electrode is electrically connected on first drain electrode; (3) the one NMOS, its three very the 3rd grid, the 3rd source electrode and the 3rd drain electrodes, wherein first grid and the 3rd grid are electrically connected in line scan signals; (4) the 2nd NMOS, its three very the 4th grid, the 4th source electrode and the 4th drain electrodes, wherein second grid and the 4th grid are electrically connected in column scan signal, the 3rd source electrode and the 4th source ground, the 3rd drain electrode and the 4th drain electrode are electrically connected on second drain electrode; (5) the 3rd PMOS, its three very the 5th grid, the 5th source electrode and the 5th drain electrodes, wherein the 5th source electrode is electrically connected on low voltage level; (6) the 3rd NMOS, its three very the 6th grid, the 6th source electrode and the 6th drain electrodes, the 6th source ground wherein, the 5th grid and the 6th grid are electrically connected on data line; (7) the 4th NMOS, its three very the 7th grid, the 7th source electrode and the 7th drain electrodes, wherein the 7th drain electrode is electrically connected on the 5th drain electrode and the 6th drain electrode; (8) the 5th NMOS, its three very the 8th grid, the 8th source electrode and the 8th drain electrodes, wherein the 8th drain electrode is electrically connected on a data line, and the 8th grid and the 7th grid are electrically connected on second drain electrode, the 3rd drain electrode and the 4th drain electrode; (9) the 4th PMOS, its three very the 9th grid, the 9th source electrode and the 9th drain electrodes, wherein the 9th source electrode is electrically connected on low voltage level; (10) the 6th NMOS, its three very the tenth grid, the tenth source electrode and the tenth drain electrodes, the tenth source ground wherein, the 9th drain electrode is electrically connected on the 7th source electrode with the tenth drain electrode; (11) the 5th PMOS, its three very the 11 grid, the tenth one source pole and the 11 drain electrodes, wherein the tenth one source pole is electrically connected on low voltage level; (12) the 7th NMOS, its three very the 12 grid, the 12 source electrode and the 12 drain electrodes, wherein the 12 grid, the 11 grid and the 9th drain electrode, the tenth drain electrode is electrically connected on the 7th source electrode simultaneously, and the 11 drain electrode and the 12 drain electrode are electrically connected on the 9th grid and the tenth grid.
When the first grid of binary latch and second grid are in opening simultaneously, and the 3rd grid, when the 4th grid is in off state simultaneously, then high level signal is exported in second drain electrode, should have the 7th grid, the 8th grid to be in opening mutually, the data-signal on the data line is transmitted: when data-signal was high level, the 8th source electrode of this binary latch was a low voltage level, the tenth grid is opened, and then the tenth drain electrode is output ground; When input data signal was low level, the 9th grid of this binary latch was opened, and the 9th drain electrode is low voltage level output.And when the 3rd grid, when the 4th grid had one to be in opening, then the second drain electrode output ground should have the 7th grid, the 8th grid to be in closed condition mutually, and the data-signal on the data line is latched.
Because the binary latch operating voltage is a low voltage level, and Organic Light Emitting Diode is a high tension apparatus, so the constant current source pixel-driving circuit adopts high voltage level, cause the uncontrollable Organic Light Emitting Diode work of output signal of binary latch, then need a level shifting circuit to realize the high-low level conversion.
The above-mentioned level shifting circuit that is connected between binary latch and the constant current source pixel-driving circuit is made up of four metal-oxide-semiconductors: (1) the 6th PMOS, and its source electrode is electrically connected to high voltage level; (2) the 7th PMOS, its source electrode is electrically connected to high voltage level; (3) the 8th NMOS, its source ground, drain electrode drains with the 6th PMOS and is electrically connected to the grid of the 7th PMOS, and grid is electrically connected to the 9th drain electrode of binary latch; (4) the 9th NMOS, its source ground, the drain electrode of drain electrode and the 7th PMOS is electrically connected to the grid of the 6th PMOS, and grid is electrically connected to the 11 drain electrode of binary latch.
The output of level shifting circuit is connected to the constant current source pixel-driving circuit, and control Organic Light Emitting Diode gray scale shows that this driving circuit comprises: (1) first switching transistor, its source ground; (2) second switch transistor, the transistorized grid of the grid of first switching transistor and second switch is electrically connected on the drain electrode of a NMOS of level shifting circuit; One Organic Light Emitting Diode, as the current drives light-emitting display device, this device has first electrode and second electrode, and its first electrode is electrically connected to the drain electrode and the second switch transistor drain of first switching transistor, second electrode grounding; One quiescent current source is electrically connected between transistorized source electrode of second switch and the high voltage level.Wherein first switching transistor is NMOS, and the second switch transistor is PMOS, and the quiescent current source is the fixed-size current source of an amplitude.Organic Light Emitting Diode has two duties: first state, the second switch transistor is opened, when first switching transistor turn-offs, the quiescent current source provides the fixed size electric current to Organic Light Emitting Diode, Organic Light Emitting Diode shows that according to the dutycycle gray scale of second switch transistor turns dutycycle is big more bright more; Second state, the second switch transistor turn-offs, and when first switching transistor was opened, the electric charge that is accumulated in its anode between the Organic Light Emitting Diode light emission period discharged by first switching transistor.
Binary latch input data signal of the present invention is a pulse-width signal, and in the frame period, this signal dutyfactor is big more, and the Organic Light Emitting Diode display gray scale is high more.On the whole display panel, all pixels all provide the fixed size electric current by constant current source, avoid pixel to show the influence that is subjected to threshold voltage, show to become more even.Discharge the electric charge that is accumulated between the Organic Light Emitting Diode light emission period on the anode by first switching transistor on the constant current source pixel-driving circuit, can effectively reduce the power consumption of display device, prolong the life-span of oganic light-emitting display device simultaneously.
Outstanding substantive distinguishing features of the present invention with remarkable advantage is: the present invention compares with the driving image element circuit of known voltage, it is identical that it offers each image element circuit size of current, make that the working current between the different pixels equates in the same display device, can not be subjected to the influence of transistor threshold voltage drift, input data line dutycycle control pixel grey scale, the organic light emitting diode in each pixel presents uniform gray scale and shows.The present invention is that whole pixel-driving circuit all adopts transistor to replace capacitor charge and discharge in the conventional pixel circuit, has greatly improved the aperture opening ratio of image element circuit.
Description of drawings
The voltage driven type two pipe image element circuits of Fig. 1 routine.
The synoptic diagram of the silica-based active matrix type organic light emitting display device of Fig. 2.
Fig. 3 pixel-driving circuit block diagram.
The circuit diagram of Fig. 4 binary latch.
The circuit working synoptic diagram of Fig. 5 binary latch.
Fig. 6 level shifting circuit synoptic diagram.
Fig. 7 level shifting circuit work synoptic diagram.
The principle schematic of Fig. 8 constant current source image element circuit.
Fig. 9 constant current source pixel-driving circuit synoptic diagram.
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows:
With reference to figure 2, Fig. 2 is for adopting the synoptic diagram of silicon base organic luminescent display device 20 of the present invention, and this display device comprises 22, one data line drive circuits 23 of 21, one column scan driving circuits of a line-scanning drive circuit and a display panel 24.On display panel 24, arrange pixel-driving circuit 25 according to matrix form, form display device.Among Fig. 2, line-scanning drive circuit 21 is turntable driving horizontal scanning line 1 to n successively, and every horizontal scanning line is electrically connected to an input end of corresponding row pixel-driving circuit 25.Column scan driving circuit 22 drives column scan line 1 to m successively, and every column scan line is electrically connected to the another one input end of respective pixel driving circuit 25.Horizontal scanning line and one infall of the column scan line of vertical direction with it are provided with a pixel-driving circuit 25, and then display device has the individual point of crossing of m * n, corresponding m * n pixel.Form the active matrix type organic light emitting display device by the capable pixel-driving circuit 25 of m row * n, the display device of each pixel is an organic light emitting diode.Because organic light emitting diode is current driving apparatus, each pixel according to organic light emitting diode during by the fixed size electric current different dutycycles be gray scale and show.Data line drive circuit 23 drives outer input datas among the present invention, and 8 data lines are parallel to be offered adjacent 8 and show the machine light emitting diode, is 256 grades of gray scales and shows that the alignment number of this display panel is 8 integral multiple.
Referring to Fig. 3, the pixel-driving circuit in this silicon base organic luminescent display device connects a constant current source pixel-driving circuit 28 by a binary latch 26 through a level shifting circuit 27 and constitutes.The principle of this pixel-driving circuit 25 is as follows, the a certain moment under the display device duty, when line-scanning drive circuit 21 produces a line scan signals 29, certain delegation in the corresponding display device, column scan driving circuit 22 produces a column scan signal 30, scan a certain row in this delegation, then pixel-driving circuit 25 of infall is selected, data line 31 writes binary latch 26 in this image element circuit, produce an organic light-emitting device switching signal, determine whether to have in this image element circuit 25 electric current by organic light emitting diode and make it luminous, the display gray scale of the organic light emitting diode of the dutycycle of data-signal 31 decision simultaneously.
Please refer to Fig. 4, Fig. 4 is the circuit diagram of the binary latch 26 used in the pixel-driving circuit 25 of present embodiment, 26 display device raw column data of binary latch gate action, its input is electrically connected on a horizontal scanning line 29,, a column scan line 30 and a data line 31, the bright dark of Organic Light Emitting Diode controlled in output, this binary latch 26 includes: (1), a PMOS 32, its three very include first grid, first source electrode and first drain electrode, and wherein this first source electrode is electrically connected on low voltage level 44; (2), the 2nd PMOS 33, its three very second grid, second source electrode and second drain electrodes, wherein this second source electrode is electrically connected on first drain electrode; (3), a NMOS 34, its three very the 3rd grid, the 3rd source electrode and the 3rd drain electrodes, wherein first grid and the 3rd grid are electrically connected in horizontal scanning line 29; (4), the 2nd NMOS 35, its three very the 4th grid, the 4th source electrode and the 4th drain electrodes, wherein second grid and the 4th grid are electrically connected in column scan line 30, the three source electrodes and 45, the three drain electrodes of the 4th source ground and the 4th drain electrode and are electrically connected on second and drain; (5), the 3rd PMOS 36, its three very the 5th grid, the 5th source electrode and the 5th drain electrodes, wherein the 5th source electrode is electrically connected on low voltage level 44; (6), the 3rd NMOS 37, its three very the 6th grid, the 6th source electrode and the 6th drain electrodes, wherein the 6th source ground 45, the five grids and the 6th grid are electrically connected on data line 31; (7), the 4th nmos pass transistor 38, its three very the 7th grid, the 7th source electrode and the 7th drain electrodes, wherein the 7th drain electrode is electrically connected on the 5th drain electrode and the 6th drain electrode; (8), the 5th NMOS 39, its three very the 8th grid, the 8th source electrode and the 8th drain electrodes, wherein the 8th drain electrode is electrically connected on a data line 31, the eight grids and the 7th grid is electrically connected on second drain electrode, the 3rd drain electrode and the 4th drain electrode; (9), the 4th PMOS 40, its three very the 9th grid, the 9th source electrode and the 9th drain electrodes, wherein the 9th source electrode is electrically connected on low voltage level 44; (10), the 6th NMOS 41, its three very the tenth grid, the tenth source electrode and the tenth drain electrodes, wherein 45, the nine drain electrodes of the tenth source ground are electrically connected on the 7th drain electrode with the tenth drain electrode; (11), the 5th PMOS 42, its three very the 11 grid, the tenth one source pole and the 11 drain electrodes, wherein the tenth one source pole is electrically connected on low voltage level 44; (12), the 7th NMOS 43, its three very the 12 grid, the 12 source electrode and the 12 drain electrodes, wherein the 12 grid, the 11 grid, the 9th drain electrode and the tenth drain electrode are electrically connected on the 7th source electrode simultaneously, and the 11 drain electrode and the 12 drain electrode are electrically connected on the 9th grid and the tenth grid.
Circuit working synoptic diagram such as Fig. 5 of binary latch 26, when the horizontal scanning line 29 of image element circuit and column scan line 30 are low (effectively) simultaneously, pixel 25 is selected, when the first grid of binary latch 26 and second grid are in opening simultaneously, and the 3rd grid, when the 4th grid is in off state simultaneously, then 46 high level are exported in second drain electrode, mutually the 7th grid should be arranged, the 8th grid is in opening, the width modulation data-signal of the representative half-tone information on the data line 31 is transferred to: when data line 31 is logic high, the 8th source electrode of this binary latch is a logic high, and the tenth grid is opened, and then the tenth drain electrode output 47 is ground; When input data line 31 was logic low, the 5th grid of this binary latch was opened, and the 5th drain electrode makes the 12 grid open for low voltage level 44, and the 12 drain electrode output 48 is ground.Output line 47 and output line 48 are a pair of anti-phase each other signal.When horizontal scanning line 29 and column scan line 30 have one at least during for high level (invalid), the 3rd grid of binary latch 26, the 4th grid has at least one to be in opening, then ground is exported in second drain electrode, should have the 7th grid, the 8th grid to be in closed condition mutually, the data-signal on the data line 31 is latched.
Pixel-driving circuit 25 in the silicon base organic luminescent display device 20, wherein Organic Light Emitting Diode is a high tension apparatus, so the supply voltage of constant current source pixel-driving circuit 28 adopts high voltage level 49, and binary latch is the digital drive part of image element circuit, its operating voltage is a low voltage level 44, for the control signal that binary latch is produced can drive the constant current source pixel-driving circuit, need a level shifting circuit 27 between the two at least.
In the present embodiment, operating voltage employing+the 5V of digital drive partial binary latch 26, constant current source pixel-driving circuit 28 operating voltage+12V, for the level that makes binary latch 26 produce can drive constant current source image element circuit 28, level shifting circuit 27 operating voltage between the two are+12V.Level shifting circuit 27 comprises at least: the 6th PMOS 50, and its source electrode is electrically connected to high voltage level 49; The 7th PMOS 51, its source electrode is electrically connected to high voltage level 49; The 8th NMOS 52, its source ground 45, drain electrode drains with the 6th PMOS 50 and is electrically connected to the grid of the 7th PMOS 51, and grid is electrically connected to the output line 47 of binary latch 26; The 9th NMOS53, its source ground 45, the drain electrode of drain electrode and the 7th PMOS 51 is electrically connected to the grid of the 6th PMOS 50, and grid is electrically connected to the output line 48 of binary latch 26.
Work synoptic diagram such as Fig. 7 of level shifting circuit 27, when the grid of the 8th NMOS 52 is input as low voltage level 44, the 8th NMOS 52 conductings, then 54 ground connection 45 are exported in the drain electrode of the 8th NMOS 52; When the grid of the 9th NMOS53 is input as low voltage level 44, the 9th NMOS 53 conductings, then the grid of the 6th PMOS 50 is ground, the 6th PMOS 50 conductings, the drain electrode output 54 of the 8th NMOS 52 is high voltage level 49.
Pixel-driving circuit 25 in the silicon base organic luminescent display device, the output 54 of its level shifting circuit 27 is as the switching signal of constant current source pixel-driving circuit 28, the gray scale of controlling Organic Light Emitting Diode shows, this constant current source pixel-driving circuit comprises: first switching transistor 55, its source ground 45; The grid of second switch transistor 56, the first switching transistors 55 and the grid of second switch transistor 56 are electrically connected on the output 54 of level shifting circuit; One Organic Light Emitting Diode 57, as the current drives light-emitting display device, this device has first electrode and second electrode, and its first electrode is electrically connected to the drain electrode of first switching transistor 55 and the drain electrode of second switch transistor 56, second electrode grounding 45; One quiescent current source 58 is electrically connected between the source electrode and high voltage level 49 of second switch transistor 56.
Physical circuit figure such as Fig. 9 of constant current source pixel-driving circuit 28 in the preferred embodiments of the present invention, wherein first switching transistor 55 is NMOS, and second switch transistor 56 is PMOS, and quiescent current source 58 is the fixed-size current source of an amplitude.Its principle of work is: when the output 54 of level shifting circuit 27 was ground, first switching transistor 55 turn-offed, 56 conductings of second switch transistor, and the electric current that quiescent current source 58 provides is by Organic Light Emitting Diode 57, and Organic Light Emitting Diode 57 is luminous; When the output 54 of level shifting circuit 27 is high level, 55 conductings of first switching transistor, second switch transistor 56 turn-offs, Organic Light Emitting Diode 57 does not have electric current to pass through, for secretly, simultaneously be discharged into ground 45 by first switching transistor, reduce the influence that anti-phase electric field that potential residual charge produces brings, the serviceable life of further improving the organic light emitting diode device at the electric charge that is accumulated between Organic Light Emitting Diode 57 light emission periods on its first electrode (anode).And the brightness of the dutycycle of data line 31 control Organic Light Emitting Diode 57, dutycycle is big more, and Organic Light Emitting Diode 57 shows bright more.In pixel cell 25, the implementation method in quiescent current source 58 has multiple.
Quiescent current source 58 is the part of pixel-driving circuit among the present invention, the silicon base organic luminescent display device duration of work, and this current amplitude remains unchanged.
Pixel-driving circuit in a kind of silicon base organic luminescent display device is to finish pixel drive on silicon chip, comprises above-mentioned binary latch 26, level shifting circuit 27 and constant current source pixel-driving circuit 28.The all crystals pipe that the present invention uses is complementary metal oxide semiconductor (CMOS).
Therefore, advantage of the present invention is the design that proposes the pixel-driving circuit in a kind of silicon base organic luminescent display device.The present invention compares with the driving image element circuit of known voltage, it is identical that it offers each image element circuit size of current, make that the working current between the different pixels equates in the same display device, can not be subjected to the influence of transistor threshold voltage drift, input data line dutycycle control pixel grey scale, the organic light emitting diode in each pixel presents uniform gray scale and shows.
In sum, though example provided by the present invention is limited, it is not in order to limit the present invention; those skilled in the art; without departing from the spirit and scope of the present invention, equivalent structure transformation of making and improvement all belong in the scope that the present invention asks for protection.
Claims (7)
1. the pixel-driving circuit in the silicon base organic luminescent display device, be that an input is electrically connected horizontal scanning line, column scan line and data line and exports the pixel-driving circuit (25) that is electrically connected a diode, it is characterized in that described pixel-driving circuit (25) connects a constant current source pixel-driving circuit (28) by a binary latch (26) through level shifting circuit (27); Described binary latch (26) has been used for display device raw column data gate action; Described constant current source pixel-driving circuit (27) is used under the pixel strobe state, provides amplitude fixed-size electric current to Organic Light Emitting Diode, makes it luminous, and the dutycycle of the data that provide according to data line changes its brightness; Described level shifting circuit (28) is used for rising a kind of high-low level transformation between binary latch and constant current source pixel-driving circuit; Described pixel-driving circuit (25) arrives the data transmission on the data line on the pixel-driving circuit (25) according to a horizontal scanning line and a column scan line, makes the Organic Light Emitting Diode gray scale show.
2. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 1, the input that it is characterized in that described binary latch (26) is electrically connected on a horizontal scanning line, a column scan line and a data line, and its output is electrically connected level shifting circuit (27), and this binary latch includes 12 metal-oxide-semiconductors:
A. a PMOS (32), its three levels are first grid, first source electrode and first drain electrode, wherein first source electrode is electrically connected on low voltage level (44);
B. the 2nd PMOS (33), its three very second grid, second source electrode and second drain electrodes, wherein second source is electrically connected on first drain electrode;
C. a NMOS (34), its three very the 3rd grid, the 3rd source electrode and the 3rd drain electrodes, described first grid and the 3rd grid are electrically connected in line scan signals (29);
D. the 2nd NMOS (35), its three very the 4th grid, the 4th source electrode and the 4th drain electrodes, described second grid and the 4th grid are electrically connected in column scan signal (30), the 3rd source electrode and the 4th source ground (45), and the 3rd drain electrode and the 4th drain electrode are electrically connected on second drain electrode;
E. the 3rd PMOS (36), its three very the 5th grid, the 5th source electrode and the 5th drain electrodes, wherein the 5th source electrode is electrically connected on low voltage level (44);
F. the 3rd NMOS (37), its three very the 6th grid, the 6th source electrode and the 6th drain electrodes, described the 6th source ground (45), the 5th grid and the 6th grid are electrically connected on data line (31);
G. the 4th NMOS (38), its three very the 7th grid, the 7th source electrode and the 7th drain electrodes, wherein the 7th drain electrode is electrically connected on the 5th drain electrode and the 6th drain electrode;
H. the 5th NMOS (39), its three very the 8th grid, the 8th source electrode and the 8th drain electrodes, wherein the 8th drain electrode is electrically connected on a data line (31), and the 8th grid and the 7th grid are electrically connected on second drain electrode, the 3rd drain electrode and the 4th drain electrode;
I. the 4th PMOS (40), its three very the 9th grid, the 9th source electrode and the 9th drain electrodes, wherein the 9th source electrode is electrically connected on low voltage level (44);
J. the 6th NMOS (41), its three very the tenth grid, the tenth source electrode and the tenth drain electrodes, the tenth source ground (45) wherein, the 9th drain electrode is electrically connected on the 7th source electrode with the tenth drain electrode;
K. the 5th PMOS (42), its three very the 11 grid, the tenth one source pole and the 11 drain electrodes, wherein the tenth one source pole is electrically connected on low voltage level (44);
L. the 7th NMOS (43), its three very the 12 grid, the 12 source electrode and the 12 drain electrodes, wherein the 12 grid, the 11 grid, the 9th drain electrode and the tenth drain electrode are electrically connected on the 7th source electrode simultaneously, and the 11 drain electrode and the 12 drain electrode are electrically connected on the 9th grid and the tenth grid.
3. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 2, it is characterized in that when first grid and second grid are in opening simultaneously, and the 3rd grid, when the 4th grid is in off state simultaneously, then high level signal is exported in second drain electrode, should there be the 7th grid, the 8th grid to be in opening mutually, data-signal on the data line is transmitted: when data-signal is high level, the 8th source electrode of this binary latch is a low voltage level, the tenth grid is opened, and then the tenth drain electrode is output ground; When input data signal was low level, the 9th grid of this binary latch was opened, and the 9th drain electrode is low voltage level output.
4. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 2, it is characterized in that when the 3rd grid, when the 4th grid has one to be in opening, then ground is exported in second drain electrode, should have the 7th grid, the 8th grid to be in closed condition mutually, the data-signal on the data line is latched.
5. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 1 is characterized in that the described level shifting circuit (27) that is connected between binary latch (26) and the constant current source pixel-driving circuit (28) is made up of four metal-oxide-semiconductors:
A. the 6th PMOS (50), its source electrode is electrically connected to high voltage level (49);
B. the 7th PMOS (51), its source electrode is electrically connected to high voltage level (49);
C. the 8th NMOS (52), its source ground (45), drain electrode and the 6th PMOS drain electrode are electrically connected to the grid of the 7th PMOS, and grid is electrically connected to the 9th drain electrode of binary latch (26);
D. the 9th NMOS (53), its source ground (45), drain electrode and the drain electrode of the 7th PMOS are electrically connected to the grid of the 6th PMOS, and grid is electrically connected to the 11 drain electrode of binary latch (26).
6. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 1, the output that it is characterized in that described level shifting circuit (27) is connected to constant current source pixel-driving circuit (28), control Organic Light Emitting Diode gray scale shows that this constant current source pixel-driving circuit comprises:
A. first switching transistor (55), its source ground;
B. second switch transistor (56), the grid of the grid of first switching transistor (55) and second switch transistor (56) is electrically connected on the drain electrode of a NMOS of level shifting circuit (26);
C. an Organic Light Emitting Diode (57), as the current drives light-emitting display device, this device has first electrode and second electrode, and its first electrode is electrically connected to the drain electrode of first switching transistor (55) and the drain electrode of second switch transistor (56), second electrode grounding (45);
D. a quiescent current source (58) is electrically connected between the source electrode and high voltage level (49) of second switch transistor (56).
7. the pixel-driving circuit in the silicon base organic luminescent display device according to claim 6, it is characterized in that described first switching transistor (55) is NMOS, second switch transistor (56) is PMOS, and quiescent current source (58) are the fixed-size current source of an amplitude.
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