CN107424571A - Organic LED display device and its driving method - Google Patents
Organic LED display device and its driving method Download PDFInfo
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- CN107424571A CN107424571A CN201710775424.9A CN201710775424A CN107424571A CN 107424571 A CN107424571 A CN 107424571A CN 201710775424 A CN201710775424 A CN 201710775424A CN 107424571 A CN107424571 A CN 107424571A
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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]
- G09G3/3266—Details of drivers for scan electrodes
-
- 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]
- G09G3/3275—Details of drivers for data electrodes
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Abstract
This application discloses a kind of organic LED display device and its driving method.The organic LED display device, including：Line-scan circuit, for producing multiple line scan signals；Column drive circuit, for producing the multiple drive signals corresponding with the multiple line scan signals according to driving data；Multiple pixel cells of pixel arrays are arranged, the multiple pixel cell includes at least one Organic Light Emitting Diode respectively；And brightness regulating circuit, for being pre-processed display data to produce the driving data, wherein, the pretreatment of the brightness regulating circuit includes producing the driving data for being used for characterizing pixel gray level and predetermined picture brightness according to display data.The organic LED display device adjusts picture brightness by the way of display data pretreatment, so as to reduce power consumption, and can be with simplified control circuit to reduce system cost.
Description
Technical field
The present invention relates to display technology field, in particular it relates to organic LED display device and its driving method.
Background technology
Organic LED display device uses Organic Light Emitting Diode (Organic Light Emitting
Diode, OLED) it is used as pixel element.OLED includes semiconductor anode side, metallic cathode and is clipped in hole transport therebetween
Layer, luminescent layer and charge transport layer.When applying voltage, electronics and the hole recombination luminescence in luminescent layer.LED display
Each pixel cell such as pixel element including red green blue tricolor, each pixel element is due to the different productions of the composition of luminescent layer
Raw respective color lights, so as to realize colored display.The pixel element of organic LED display device is from main light emission, no
Backlight is needed, and has the advantages that the response time is fast, luminous efficiency is high, brightness is high, wide viewing angle, therefore is plane of new generation
The emerging application technology of display.
The structure of organic LED display device mainly includes display panel, line-scan circuit, column drive circuit.It is aobvious
Show that panel is included due to the array of multiple pixel cells composition arranged in rows and columns.Each pixel cell includes at least one pixel elements
Part and its at least one thin film transistor (TFT) being connected.In each frame period, line-scan circuit timesharing selectively turns on to property
The thin film transistor (TFT) that each row pixel element is connected, column drive circuit is by the drive corresponding with the display data of the row pixel element
Streaming current applies to the anode of pixel element.
In liquid crystal display device, the height level regulation of backlight module can be utilized to change the brightness of whole picture so that
Liquid crystal display device, which can reduce picture brightness face, reduces power consumption.In organic LED display device, then the back of the body is eliminated
Optical mode group, favourable aspect is can be with reduce thickness size, but unfavorable aspect is to be difficult to adjust picture brightness.
Therefore, it is desirable to picture brightness is adjusted in organic LED display device to meet to improve display quality or subtract
The demand of low power consumption.
The content of the invention
In view of the above problems, it is an object of the invention to provide a kind of driving side for organic LED display device
Method, wherein, the blank frame of corresponding data is inserted to adjust picture brightness according to intensity level between picture frame.
According to an aspect of the present invention, there is provided a kind of organic LED display device, including：Line-scan circuit, use
In the multiple line scan signals of generation；Column drive circuit is relative with the multiple line scan signals for being produced according to driving data
The multiple drive signals answered；Multiple pixel cells of pixel arrays are arranged, the multiple pixel cell includes at least one respectively
Individual Organic Light Emitting Diode；And brightness regulating circuit, for being pre-processed to display data to produce the driving data,
Wherein, the multiple pixel cell is connected with the line-scan circuit and the column drive circuit, the multiple row scanning letter
Number it is used to scan the pixel cell do not gone together, the multiple drive signal is used to produce driving current to apply to the picture of different lines
Plain unit, so as to control the effective brightness of the multiple pixel cell in a frame period, the pretreatment of the brightness regulating circuit
Including producing the driving data for being used for characterizing pixel gray level and predetermined picture brightness according to display data.
Preferably, the pretreatment of the brightness regulating circuit is included in insertion and the picture brightness phase in multiple images frame
Corresponding at least one blank frame, in the multiple picture frame, the effective brightness in a frame period of each pixel cell and phase
Answer the GTG of pixel corresponding, at least one blank frame, the effective brightness of all pixels unit in a frame period with
Constant GTG is corresponding.
Preferably, the quantity of the multiple picture frame and at least one blank frame are set according to the picture brightness
Ratio between quantity.
Preferably, the constant GTG of at least one blank frame is set according to the picture brightness.
Preferably, the frame period equal length of the multiple picture frame and at least one blank frame.
Preferably, at least one blank frame is periodically distributed in the multiple picture frame.
Preferably, the continuous blank frame at least one blank frame is located at two neighboring in the multiple picture frame
Between picture frame.
Preferably, the brightness regulating circuit adjusts the driving number according to the Number dynamics of at least one blank frame
According to frame per second so that the driving data and the display data include the picture frame of identical quantity within the unit interval.
Preferably, the multiple pixel cell includes being used for the multiple pixel elements for showing different colours respectively.
Preferably, the brightness regulating circuit adjusts the picture brightness of different colours respectively.
Preferably, the multiple pixel cell includes respectively：The driving being sequentially connected in series between supply voltage and ground
Transistor and Organic Light Emitting Diode；And it is connected to the selecting switch between drive end and the grid of the driving transistor
Pipe, drive signal is received in the drive end, the grid of the selecting switch pipe is connected to selection end to receive scanning signal.
Preferably, the multiple pixel cell also includes respectively：It is connected between the grid and ground of the driving transistor
Storage capacitance.
Preferably, the pretreatment of the brightness regulating circuit is included the pixel cell of multiple regional areas in picture frame
Blank pixel is arranged to, in the normal pixel of described image frame, the effective brightness in a frame period of each pixel cell and phase
Answer the GTG of pixel corresponding, in the blank pixel of described image frame, the effective brightness of all pixels unit in a frame period
It is corresponding with constant GTG.
Preferably, the quantity of normal pixel described in described image frame and the blank picture are set according to the picture brightness
Ratio between the quantity of element.
Preferably, the constant GTG of the blank pixel is set according to the picture brightness.
Preferably, the multiple regional area be distributed evenly in it is multiple in image frame corresponding to described image frame
Subregion.
Preferably, the multiple pixel cell includes being used for the multiple pixel elements for showing different colours respectively.
Preferably, the multiple regional area is the pixel element of the predetermined color in the multiple pixel cell.
Preferably, in same frame, the pixel element of selected color is arranged to constant effective brightness, in successive frame
In, select the pixel cell of different colours to be arranged to constant effective brightness, so as to maintain the color effect of continuous pictures.
According to another aspect of the present invention, there is provided a kind of driving method for organic LED display device, institute
Stating organic LED display device includes multiple pixel cells of arrangement pixel arrays, and methods described includes：To display
Data are pre-processed to produce driving data；The multiple drivings corresponding with multiple line scan signals are produced according to driving data
Signal；It is used to scan the pixel cell do not gone together using the multiple line scan signals；It is used for using the multiple drive signal
Driving current is produced to apply to the pixel cell of different lines, so as to control the multiple pixel cell in a frame period effective
Brightness, wherein, the pretreatment includes producing the drive for being used for characterizing pixel gray level and predetermined picture brightness according to display data
Dynamic data.
Preferably, the pretreatment be included in multiple images frame insert it is corresponding with the picture brightness at least one
Blank frame, in the multiple picture frame, the effective brightness of each pixel cell in a frame period and the GTG phase of respective pixel
Corresponding, at least one blank frame, the effective brightness of all pixels unit in a frame period is corresponding with constant GTG.
Preferably, the quantity of the multiple picture frame and at least one blank frame are set according to the picture brightness
Ratio between quantity.
Preferably, the constant GTG of at least one blank frame is set according to the picture brightness.
Preferably, the frame period equal length of the multiple picture frame and at least one blank frame.
Preferably, at least one blank frame is periodically distributed in the multiple picture frame.
Preferably, the continuous blank frame at least one blank frame is located at two neighboring in the multiple picture frame
Between picture frame.
Preferably, in addition to：The frame per second of the driving data is adjusted according to the Number dynamics of at least one blank frame,
So that the driving data and the display data include the picture frame of identical quantity within the unit interval.
Preferably, the multiple pixel cell includes being used for the multiple pixel elements for showing different colours respectively.
Preferably, the picture brightness of different colours is adjusted respectively.
Preferably, the pretreatment includes the pixel cell of multiple regional areas in picture frame being arranged to blank picture
Element, in the normal pixel of described image frame, the GTG of the effective brightness in a frame period of each pixel cell and respective pixel
It is corresponding, in the blank pixel of described image frame, the effective brightness of all pixels unit in a frame period and constant GTG phase
It is corresponding.
Preferably, the quantity of normal pixel described in described image frame and the blank picture are set according to the picture brightness
Ratio between the quantity of element.
Preferably, the constant GTG of the blank pixel is set according to the picture brightness.
Preferably, the multiple regional area be distributed evenly in it is multiple in image frame corresponding to described image frame
Subregion.
Preferably, the multiple pixel cell includes being used for the multiple pixel elements for showing different colours respectively.
Preferably, the multiple regional area is the pixel element of the predetermined color in the multiple pixel cell.
Preferably, in same frame, the pixel element of selected color is arranged to constant effective brightness, in successive frame
In, select the pixel cell of different colours to be arranged to constant effective brightness.
Organic LED display device according to embodiments of the present invention, will by the way of display data pretreatment
Display data is converted into driving data, wherein, blank frame is inserted between picture frame, to utilize blank frame regulation picture brightness.
The adjusting method can be according to effective brightness of identical proportion adjustment all pixels unit, so that according to display demand, in height
Image quality improves picture brightness when showing, reduces picture brightness when low image quality is shown so as to reduce power consumption.The adjusting method is not required to
In pixel cell picture is adjusted comprising extra switch pipe for adjusting Organic Light Emitting Diode OLED effective lighting time
Face brightness, control circuit is without the generation duty cycle signals corresponding with picture brightness.With existing Organic Light Emitting Diode
Display device is compared, and organic LED display device according to embodiments of the present invention can further reduce power consumption, and
Can be with simplified control circuit to reduce system cost.
Brief description of the drawings
By the description to the embodiment of the present invention referring to the drawings, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the schematic block diagram of the organic LED display device structure according to prior art.
Fig. 2 shows the schematic circuit of pixel cell in the organic LED display device in Fig. 1.
Fig. 3 shows the schematic block diagram of organic LED display device structure according to embodiments of the present invention.
Fig. 4 shows the schematic circuit of pixel cell in the organic LED display device in Fig. 3.
It is bright in different pictures that organic LED display device according to embodiments of the present invention is shown respectively in Fig. 5 a and 5b
The dynamic frame per second of the lower driving data of degree.
Embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.In addition, do not drawn in figure
Lead-out wire in addition to corresponding driving electrodes are with sensing electrode, and some known parts may be not shown.
It describe hereinafter many specific details of the present invention, such as the structure of device, material, size, processing work
Skill and technology, to be more clearly understood that the present invention.But just as the skilled person will understand, it can not press
The present invention is realized according to these specific details.
Herein, the pixel element of organic LED display device is Organic Light Emitting Diode OLED.For letter
For the sake of bright, only show that each pixel cell includes the example of monochromatic display device of a pixel element herein.It is appreciated that
The invention is not restricted to this, but can apply to each pixel cell includes the colour display device of multiple pixel elements.
Fig. 1 shows the schematic block diagram of the organic LED display device structure according to prior art.
The structure of organic LED display device 100 mainly includes line-scan circuit 110, column drive circuit 120, bright
Degree regulation circuit 140 and display panel.Display panel is included due to the n*m of multiple 130 compositions arranged in rows and columns of pixel cell
Array.
The output end of line-scan circuit 110 is connected with scan line S1 to Sn, and the scan line S1 to Sn further distinguishes
It is connected to the control terminal of the pixel cell 130 of corresponding a line.
The output end of column drive circuit 120 is connected with drives line D1 to Dm, and the drives line D1 to Dm further distinguishes
It is connected to the drive end of the pixel cell 130 of a corresponding row.
The output end of brightness regulating circuit 140 is described energy line E1 to Em is further connected with making energy line E1 to Em be connected
It is connected to the adjustable side of corresponding one-row pixels unit 130.
In the course of the work, organic LED display device display image frame by frame, so as to the shape in multiple frame periods
Into continuous video pictures.In each frame period, line-scan circuit 110 is scanned, and selectively property one is turned on timesharing
Selecting switch pipe in row pixel cell 130.
Further, during the selecting switch pipe conducting of the pixel cell 130 of select row, column drive circuit 120 will be with
The corresponding driving current of display data applies the anode of the pixel element into the row pixel cell 130.In each frame period
In, effective brightness of pixel element is corresponding with driving current, so as to consistent with the GTG of the respective pixel in image.
Further, during the selecting switch pipe conducting of the pixel cell 130 of select row, brightness regulating circuit 120 will
Enable signal is provided to the extra switch pipe in the one-row pixels unit of corresponding line.The enable signal be with picture brightness phase
The pulse signal of corresponding dutycycle.The extra switch pipe controls driving current to apply to the row pixel cell according to enable signal
Effective lighting time of the anode of pixel element in 130.
Effective brightness of the pixel element in a frame period depends on the size of driving current and the duty of enable signal
Than.The driving current of multiple pixel elements is corresponding with the GTG of respective image pixel respectively, and effective lighting time draws with whole
The brightness in face is corresponding.Therefore, each row pixel cell of the organic LED display device can be according to identical ratio
Effective brightness is adjusted, realizes the regulation of picture brightness.
Fig. 2 shows the schematic circuit of pixel cell in the organic LED display device in Fig. 1.
Pixel cell 130 includes selecting switch pipe MS1, extra switch pipe MS2, driving transistor MD, electric capacity CD, Yi Jiyou
Machine light emitting diode OLED.In this embodiment, selecting switch pipe MS1, extra switch pipe MS2, driving transistor MD for example divide
It is not N-type MOS transistor.In alternate embodiments, N-type MOS transistor can be used to substitute N-type MOS transistor.
In pixel cell 130, driving transistor MD, extra switch pipe MS and Organic Light Emitting Diode OLED are sequentially connected in series
It is connected between supply voltage and ground (that is, simulation ground).Selecting switch pipe MS1's is connected to drive end and driving transistor MD
Between grid.Selecting switch pipe MS1 grid and extra switch pipe MS2 grid are respectively connecting to select end and Enable Pin, with
Selection signal Si and enable signal Ei is received respectively.Selecting switch pipe MS1 receives drive signal Di via drive end.Electric capacity C1 connects
It is connected between driving transistor MD grid and ground, as storage capacitance.
In a frame period, for light emitting display device 100 under the control of scanning signal, timesharing turns on each row pixel list
Selecting switch pipe MS1 in member 130.During selecting switch pipe MS1 conducting, drive signal Di is via selecting switch pipe MS1
Apply to driving transistor MD grid so that driving transistor MD produces the driving current Id corresponding with display data.Drive
Streaming current Id applies to organic light emission two via extra switch pipe MS2 pipe OLED.
Effective brightness of the Organic Light Emitting Diode OLED in a frame period depends on driving current Id size and made
Energy signal Ei dutycycle.Enable signal Ei dutycycle determines Organic Light Emitting Diode OLED effective lighting time.Should
The driving current Id of pixel cell 130 is corresponding with the GTG of respective image pixel, and enable signal Ei dutycycle is drawn with whole
The brightness in face is corresponding.Therefore, each row pixel cell of the organic LED display device can be according to identical ratio
Effective brightness is adjusted, realizes the regulation of picture brightness.
In the above-mentioned organic LED display device according to prior art, connected using with Organic Light Emitting Diode
Extra switch pipe regulation picture brightness.The adjusting method can be adjusted in continuous multiple frame periods according to identical ratio
Effective brightness of all pixels unit is saved, so that according to display demand, picture brightness is improved when high image quality is shown, in low image quality
Reduce picture brightness during display so as to reduce power consumption.However, because extra switch pipe is connected in series with light emitting diode, it is additional to open
Close pipe and itself also generate additional power consumption.
Further, it is corresponding with picture brightness to provide dutycycle for the need of work brightness regulating circuit of the extra switch pipe
Enable signal, cause control circuit to complicate.In order to produce enable signal, the working frequency of brightness regulating circuit will be above going
The working frequency of drive circuit, so as to cause system cost to increase.
Fig. 3 shows the schematic block diagram of organic LED display device structure according to embodiments of the present invention.
The structure of organic LED display device 200 mainly includes line-scan circuit 110, column drive circuit 120, bright
Degree regulation circuit 240 and display panel.Display panel is included due to the n*m of multiple 130 compositions arranged in rows and columns of pixel cell
Array, wherein, n and m are respectively natural number.
The output end of line-scan circuit 110 is connected with scan line S1 to Sn, and the scan line S1 to Sn further distinguishes
It is connected to the control terminal of the pixel cell 130 of corresponding a line.
Brightness regulating circuit 240 is connected with column drive circuit 120, for being pre-processed to display data, to produce
It is used for characterizing the driving data of pixel gray level and picture brightness.In this embodiment, by for characterizing pixel gray level
At least one blank frame corresponding with picture brightness is inserted in multiple images frame, so as to form driving data.
Column drive circuit 120 produces drive signal according to driving data.The output end of column drive circuit 120 and drives line D1
It is connected to Dm, the drives line D1 to Dm is further respectively connecting to the drive end of the pixel cell 130 of a corresponding row.
In the course of the work, organic LED display device display image frame by frame, so as to the shape in multiple frame periods
Into continuous video pictures.In each frame period, line-scan circuit 110 is scanned, and selectively property one is turned on timesharing
Selecting switch pipe in row pixel cell 230.
Further, during the selecting switch pipe conducting of the pixel cell 230 of select row, column drive circuit 120 will be with
The corresponding driving current of driving data applies the anode of the pixel element into the row pixel cell 230.In each picture frame
Frame period in, effective brightness of pixel element is corresponding with driving current, so as to GTG one with the respective pixel in image
Cause.In the frame period of each blank frame, effective brightness of pixel element is then steady state value.In one embodiment, the blank
Frame is black picture, and therefore, insertion blank frame will reduce picture brightness between picture frame.In another embodiment, the blank
Frame is white picture, and therefore, insertion blank frame will improve picture brightness between picture frame.
In this embodiment, by changing the quantity of blank frame relative to the ratio between the quantity of picture frame, it is possible to
Adjust the intensity level of picture brightness.Blank frame is not limited to black picture or white picture, but can be arbitrary single grey menu,
That is, in blank frame, the GTG of all pixels unit is steady state value.When using multiple blank frames, multiple blank frames can
Between being continuously inserted in two adjacent picture frames, it can also be respectively inserted between two adjacent picture frames.
Therefore, each row pixel cell of the organic LED display device can be effective according to identical proportion adjustment
Brightness, realize the regulation of picture brightness.
Further, due to be sent to from control terminal the display data of organic LED display device have it is predetermined
Frame per second, therefore, above-mentioned brightness regulating circuit also include the frame per second according to picture brightness dynamic regulation driving data so that all
Picture frame can be shown, so as to realize the display quality that dynamic menu is maintained while picture brightness regulation.
Fig. 4 shows the schematic circuit of pixel cell in the organic LED display device in Fig. 3.
Pixel cell 230 includes selecting switch pipe MS1, driving transistor MD, electric capacity CD and Organic Light Emitting Diode
OLED.In this embodiment, selecting switch pipe MS1, driving transistor MD are for example N-type MOS transistor respectively.In the reality of replacement
Apply in example, N-type MOS transistor can be used to substitute N-type MOS transistor.
In pixel cell 230, driving transistor MD and Organic Light Emitting Diode OLED are sequentially connected in series in power supply electricity
Between pressure and ground.Selecting switch pipe MS1's is connected between drive end and driving transistor MD grid.Selecting switch pipe MS1
Grid be connected to selection end, to receive selection signal Si.Selecting switch pipe MS1 receives drive signal Di via drive end.
In a frame period, for light emitting display device 100 under the control of scanning signal, timesharing turns on each row pixel list
Selecting switch pipe MS1 in member 230.During selecting switch pipe MS1 conducting, drive signal Di is via selecting switch pipe MS1
Apply to driving transistor MD grid so that driving transistor MD produces the driving current Id corresponding with display data.Drive
Streaming current Id applies to organic light emission two via extra switch pipe MS2 pipe OLED.
Effective brightness of the Organic Light Emitting Diode OLED in a frame period depends on driving current Id size.Even
The quantity of the blank frame inserted in continuous multiple images frame is used to adjust picture brightness, the quantity of picture frame and the quantity of blank frame
Between ratio determine intensity level.Therefore, each row pixel cell of the organic LED display device can be according to identical
The effective brightness of proportion adjustment, realize the regulation of picture brightness.
In above-mentioned organic LED display device according to embodiments of the present invention, using display data pretreatment
Mode, display data is converted into driving data, wherein, blank frame is inserted between picture frame, to utilize blank frame regulation picture
Face brightness.The adjusting method can be according to effective brightness of identical proportion adjustment all pixels unit, so as to according to display need
Ask, picture brightness is improved when high image quality is shown, reduce picture brightness when low image quality is shown so as to reduce power consumption.The regulation side
Method need not in pixel cell comprising extra switch pipe be used to adjusting Organic Light Emitting Diode OLED effective lighting time with
Picture brightness is adjusted, control circuit is without the generation duty cycle signals corresponding with picture brightness.With existing organic light emission
Diode display is compared, and organic LED display device according to embodiments of the present invention can further reduce work(
Consumption, and can be with simplified control circuit to reduce system cost.
It is bright in different pictures that organic LED display device according to embodiments of the present invention is shown respectively in Fig. 5 a and 5b
The dynamic frame per second of the lower driving data of degree.
In the organic LED display device of the embodiment of the present invention, the brightness regulating circuit 230 shown in Fig. 3 is to aobvious
Registration inserts blank frame according to being pre-processed between picture frame, to utilize blank frame regulation picture brightness.In data-signal
In the case of frame per second is 4Hz, the organic LED display device can show 4 picture frames in the period per second
Fm1 to fm4.
In this embodiment, in picture frame, effective brightness of each pixel cell in a frame period and corresponding picture
Element GTG it is corresponding, such as each pixel cell drive signal between 0 to 255 step voltage value.In blank frame, institute
Have that effective brightness of the pixel cell in a frame period is corresponding with constant GTG, such as the drive signal of all pixels unit
It is 0 step voltage, so as to which the blank frame inserted between picture frame is black picture.As shown in Figure 5 a, inserted in 4 picture frames
In the case of one blank frame fb1, the frame per second of driving data is 5Hz according to caused by display data, and picture brightness is full brightness
80%.As shown in Figure 5 b, in the case of two blank frame fb1, fb2 are inserted in 4 picture frames, produced according to display data
The frame per second of driving data be 6Hz, picture brightness is the 67.7% of full brightness.
Although show to be spaced a picture frame between two blank frames fb1, fb2 in figure 5b.However, the invention is not restricted to
This, two blank frames can be inserted continuously between two adjacent picture frames, or the one or more figures in interval each other
As frame.
In this embodiment, the frame per second of the driving data generated according to display data dynamic change between 4~6Hz.So
And the invention is not restricted to this, the frame per second of the driving data is the dynamic change for example between 30~240Hz in actual product.Should
The upper limit of dynamic range is limited by the refresh rate of display device.If the standard frame per second of display data is 60Hz, driving number
According to maximum frame per second be 240Hz, then in the period per second, 180 blank frames can be at most inserted in 60 picture frames,
So as to realize 180 grades of picture brightness regulations.Further, by setting the constant GTG of blank frame, it is possible to achieve more ranks
Picture brightness regulation.In this manual, horizontal concept and accompanying drawing shown in accompanying drawing " OK " are not limited to the concept of " row "
Shown in longitudinal concept, according to being actually needed, meet the embodiment of its general principles in protection scope of the present invention
It is interior.
In the above-described embodiment, describe brightness regulating circuit and driving data is generated according to display data, wherein dynamic
The frame per second of driving data is adjusted, so as to insert blank frame between picture frame.In alternate embodiments, brightness regulating circuit exists
When generating driving data according to display data, frame per second constant is maintained, further, in each picture frame, according to picture
The pixel of multiple regional areas is arranged to blank pixel by brightness.The multiple regional area includes being evenly distributed on image frame
In more sub-regions, or the pixel element of the predetermined color in pixel cell.The blank pixel having in a frame period
It is corresponding with constant GTG to imitate brightness, such as is maintained minimum gray scale (often going out) or highest GTG (Chang Liang).
The alternative embodiment sets the quantity of the multiple blank pixel according to picture brightness, so as to maintain frame
Required picture brightness can be set in the case that rate is constant.It is the pixel element of predetermined color in the multiple regional area
Under situation, for example, in same frame, the pixel element of selected color is arranged to constant effective brightness, in successive frame, choosing
The pixel cell of different colours is selected, so as to maintain the color effect of continuous pictures.Such as in continuous three picture frames, respectively
The pixel element of RGB color is arranged to constant effective brightness, the pixel element of remaining color is then according to display data point
It is bright.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including the key element.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (36)
1. a kind of organic LED display device, including：
Line-scan circuit, for producing multiple line scan signals；
Column drive circuit, for producing the multiple drive signals corresponding with the multiple line scan signals according to driving data；
Multiple pixel cells of pixel arrays are arranged, the multiple pixel cell includes at least one organic light-emitting diodes respectively
Pipe；And
Brightness regulating circuit, for being pre-processed to display data to produce the driving data,
Wherein, the multiple pixel cell is connected with the line-scan circuit and the column drive circuit, and the multiple row is swept
Retouch signal be used for scan the pixel cell do not gone together, the multiple drive signal is for producing driving current to apply to different lines
Pixel cell, so as to control the effective brightness of the multiple pixel cell in a frame period,
The pretreatment of the brightness regulating circuit, which includes being produced according to display data, to be used for characterizing pixel gray level and predetermined picture
The driving data of brightness.
2. organic LED display device according to claim 1, wherein, the pretreatment of the brightness regulating circuit
It is included at least one blank frame that insertion is corresponding with the picture brightness in multiple images frame,
In the multiple picture frame, the effective brightness of each pixel cell in a frame period is relative with the GTG of respective pixel
Should, at least one blank frame, the effective brightness of all pixels unit in a frame period is corresponding with constant GTG.
3. organic LED display device according to claim 2, wherein, according to being set the picture brightness
Ratio between the quantity of multiple images frame and the quantity of at least one blank frame.
4. organic LED display device according to claim 2, wherein, according to being set the picture brightness
The constant GTG of at least one blank frame.
5. organic LED display device according to claim 2, wherein, the multiple picture frame with it is described at least
The frame period equal length of one blank frame.
6. organic LED display device according to claim 2, wherein, at least one blank frame is periodically
Ground is distributed in the multiple picture frame.
7. organic LED display device according to claim 6, wherein, the company at least one blank frame
Continuous blank frame is located between the two adjacent images frame in the multiple picture frame.
8. organic LED display device according to claim 2, wherein, the brightness regulating circuit is according to
The Number dynamics of at least one blank frame adjust the frame per second of the driving data so that the driving data and the display data
Include the picture frame of identical quantity within the unit interval.
9. organic LED display device according to claim 2, wherein, the multiple pixel cell includes respectively
For showing multiple pixel elements of different colours.
10. organic LED display device according to claim 9, wherein, the brightness regulating circuit is adjusted respectively
Save the picture brightness of different colours.
11. organic LED display device according to claim 2, wherein, the multiple pixel cell wraps respectively
Include：
The driving transistor and Organic Light Emitting Diode being sequentially connected in series between supply voltage and ground；And
The selecting switch pipe being connected between drive end and the grid of the driving transistor, driving letter is received in the drive end
Number, the grid of the selecting switch pipe is connected to selection end to receive scanning signal.
12. organic LED display device according to claim 11, wherein, the multiple pixel cell is gone back respectively
Including：
The storage capacitance being connected between the grid and ground of the driving transistor.
13. organic LED display device according to claim 1, wherein, the pre- place of the brightness regulating circuit
Reason includes the pixel cell of multiple regional areas in picture frame being arranged to blank pixel, in the normal pixel of described image frame
In, the effective brightness of each pixel cell in a frame period is corresponding with the GTG of respective pixel, in the blank of described image frame
In pixel, the effective brightness of all pixels unit in a frame period is corresponding with constant GTG.
14. organic LED display device according to claim 13, wherein, institute is set according to the picture brightness
State the ratio between the quantity of normal pixel described in picture frame and the quantity of the blank pixel.
15. organic LED display device according to claim 13, wherein, institute is set according to the picture brightness
State the constant GTG of blank pixel.
16. organic LED display device according to claim 13, wherein, the multiple regional area is uniform
Ground is distributed in more sub-regions in image frame corresponding to described image frame.
17. organic LED display device according to claim 13, wherein, the multiple pixel cell wraps respectively
Include multiple pixel elements for showing different colours.
18. organic LED display device according to claim 17, wherein, the multiple regional area is described
The pixel element of predetermined color in multiple pixel cells.
19. organic LED display device according to claim 18, wherein, in same frame, by selected color
Pixel element be arranged to constant effective brightness, in successive frame, select the pixel cell of different colours to be arranged to constant
Effective brightness, so as to maintain the color effect of continuous pictures.
20. a kind of driving method for organic LED display device, the organic LED display device bag
Multiple pixel cells of arrangement pixel arrays are included, methods described includes：
Display data is pre-processed to produce driving data；
The multiple drive signals corresponding with multiple line scan signals are produced according to driving data；
It is used to scan the pixel cell do not gone together using the multiple line scan signals；
The multiple drive signal is used to be used to produce driving current to apply to the pixel cell of different lines, it is described so as to control
The effective brightness of multiple pixel cells in a frame period,
Wherein, the pretreatment includes producing the driving for being used for characterizing pixel gray level and predetermined picture brightness according to display data
Data.
21. according to the method for claim 20, wherein, the pretreatment is included in insertion and the picture in multiple images frame
The corresponding at least one blank frame of face brightness,
In the multiple picture frame, the effective brightness of each pixel cell in a frame period is relative with the GTG of respective pixel
Should, at least one blank frame, the effective brightness of all pixels unit in a frame period is corresponding with constant GTG.
22. the method according to claim 11, wherein, according to the quantity of the multiple picture frame of picture brightness setting
Ratio between the quantity of at least one blank frame.
23. according to the method for claim 21, wherein, at least one blank frame is set according to the picture brightness
Constant GTG.
24. according to the method for claim 21, wherein, the frame of the multiple picture frame and at least one blank frame is all
Phase equal length.
25. according to the method for claim 21, wherein, at least one blank frame is periodically distributed in the multiple
In picture frame.
26. according to the method for claim 25, wherein, the continuous blank frame at least one blank frame is positioned at described
Between two adjacent images frame in multiple images frame.
27. the method according to claim 11, in addition to：Institute is adjusted according to the Number dynamics of at least one blank frame
State the frame per second of driving data so that the driving data and the display data include the image of identical quantity within the unit interval
Frame.
28. according to the method for claim 21, wherein, the multiple pixel cell includes being used to show different colours respectively
Multiple pixel elements.
29. according to the method for claim 28, wherein, respectively adjust different colours picture brightness.
30. according to the method for claim 20, wherein, the pretreatment is included multiple regional areas in picture frame
Pixel cell is arranged to blank pixel, in the normal pixel of described image frame, each pixel cell in a frame period effective
Brightness is corresponding with the GTG of respective pixel, and in the blank pixel of described image frame, all pixels units is in a frame period
Effective brightness is corresponding with constant GTG.
31. according to the method for claim 30, wherein, set according to the picture brightness normal described in described image frame
Ratio between the quantity of the quantity of pixel and the blank pixel.
32. the method according to claim 11, wherein, according to the constant ash of the picture brightness setting blank pixel
Rank.
33. according to the method for claim 30, wherein, the multiple regional area is to be distributed evenly in described image frame
More sub-regions in corresponding image frame.
34. according to the method for claim 30, wherein, the multiple pixel cell includes being used to show different colours respectively
Multiple pixel elements.
35. according to the method for claim 34, wherein, the multiple regional area is pre- in the multiple pixel cell
Determine the pixel element of color.
36. according to the method for claim 35, wherein, in same frame, the pixel element of selected color is arranged to permanent
Fixed effective brightness, in successive frame, the pixel cell of different colours is selected to be arranged to constant effective brightness.
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