CN106816137A - Display device and the method for increasing the display device brightness homogeneity - Google Patents
Display device and the method for increasing the display device brightness homogeneity Download PDFInfo
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- CN106816137A CN106816137A CN201710239655.8A CN201710239655A CN106816137A CN 106816137 A CN106816137 A CN 106816137A CN 201710239655 A CN201710239655 A CN 201710239655A CN 106816137 A CN106816137 A CN 106816137A
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
本公开提供一种显示装置及增加该显示装置亮度均一性的方法。该显示装置包括：显示面板和处理装置，其中所述显示面板包括电源电压检测模块，所述电源电压检测模块用于检测所述显示面板的直流电压降，并将所述直流电压降输入至所述处理装置进行处理；所述处理装置根据所述直流电压降输出所述显示面板相应位置的数据信号电压的补偿电压，通过所述补偿电压修正所述显示面板的数据信号电压。本公开可以提高显示器件的亮度均一性。
The disclosure provides a display device and a method for increasing brightness uniformity of the display device. The display device includes: a display panel and a processing device, wherein the display panel includes a power supply voltage detection module, the power supply voltage detection module is used to detect the DC voltage drop of the display panel, and input the DC voltage drop to the The processing device performs processing; the processing device outputs the compensation voltage of the data signal voltage at the corresponding position of the display panel according to the DC voltage drop, and corrects the data signal voltage of the display panel through the compensation voltage. The present disclosure can improve brightness uniformity of a display device.
Description
Technical field
This disclosure relates to display technology field, in particular to a kind of display device and increase the display device brightness
The method of homogeneity.
Background technology
With rapidly improving for Display Technique, the semiconductor component technology as display device core is also flown therewith
The progress of jump property.For existing display device, Organic Light Emitting Diode (Organic Light Emitting
Diode, OLED) as a kind of current mode luminescent device, because of its self-luminous, quick response, wide viewing angle and can make
On flexible substrates the features such as and be applied in the middle of high-performance display field more and more.OLED can be divided into by type of drive
PMOLED (Passive Matrix Driving OLED, passive waked-up Organic Light Emitting Diode) and AMOLED (Active
Matrix Driving OLED, active matrix-driven organic light-emitting diode) two kinds, because displayer has low system
The advantages of causing sheet, answer speed high, power saving, the DC driven that can be used for portable set, operating temperature range big etc. and can
Hope the novel flat panel display of future generation for turning into substitution LCD (liquid crystal display, liquid crystal display).
However, prior art is for large-sized displayer, because there is certain electricity in backboard power line
Resistance, when OLED is luminous, the driving current of all pixels is carried by drive control line ELVDD by scan drive cell
It is supplied to each pixel cell.Therefore, in above-mentioned glow phase, pixel list of the input at the scan drive cell position
The voltage of unit is relative to the pixel cell (such as last row pixel cell) at transmission range scan drive cell farther out position
Voltage it is high.This phenomenon is referred to as direct current pressure drop (IR Drop).
Because the voltage of scan drive cell input pixel cell is related to the electric current for flowing through each pixel cell, therefore,
IR Drop can cause size of current that the pixel cell of diverse location flows through difference so that displayer is in display
When produce luminance difference, for example, during the first row pixel all light, the brightness of its display can be from left to right dimmed successively.Above-mentioned brightness
The phenomenon of difference is moire phenomenon (mura).The quality of display picture can so be caused to be reduced, so as to the quality to display
Adversely affected with display effect.
Therefore, also there is the part that has much room for improvement in technical scheme of the prior art.
It should be noted that information is only used for strengthening the reason of background of this disclosure disclosed in above-mentioned background section
Solution, therefore can include not constituting the information to prior art known to persons of ordinary skill in the art.
The content of the invention
The purpose of the disclosure is a kind of method for providing display device and increasing the display device brightness homogeneity, and then
At least overcome to a certain extent due to one or more problem caused by the limitation of correlation technique and defect.
Other characteristics and advantage of the disclosure will be apparent from by following detailed description, or partially by this public affairs
The practice opened and acquistion.
According to an aspect of this disclosure, there is provided a kind of display device, including display panel and processing unit, wherein described
Display panel includes supply voltage detection module, and the supply voltage detection module is used to detect the direct current of the display panel
Pressure drop, and the direct current pressure drop is input into the processing unit is processed；The processing unit is according to the direct current
Pressure drop exports the offset voltage of the voltage data signal of the display panel relevant position, by described in the offset voltage amendment
The voltage data signal of display panel.
In a kind of exemplary embodiment of the disclosure, the supply voltage detection module is detected including the first supply voltage
Line and second source voltage detecting line, are respectively used to detect first supply voltage and second source voltage of the display panel,
And by first supply voltage and the second source control source to the processing unit.
In a kind of exemplary embodiment of the disclosure, the display device also includes source electrode drive circuit, wherein, it is described
First supply voltage detection line is disposed in proximity to one end of the source electrode drive circuit, and the second source voltage detecting line is set
In the other end away from the source electrode drive circuit.
In a kind of exemplary embodiment of the disclosure, the display device also includes gate driving circuit, wherein, it is described
The vertical cabling of second source voltage detecting line is connected to the processing unit by the bypass cabling of the gate driving circuit.
In a kind of exemplary embodiment of the disclosure, the processing unit is time schedule controller.
In a kind of exemplary embodiment of the disclosure, the time schedule controller includes analog-digital converter, the mould
Intending digital quantizer is used to for the direct current pressure drop simulated to be converted to data signal.
In a kind of exemplary embodiment of the disclosure, the display panel includes latticed supply voltage cabling, its
In, the length of the supply voltage cabling of the display panel is directly proportional to the resistance of the display panel.
In a kind of exemplary embodiment of the disclosure, the display device is OLED display.
According to an aspect of this disclosure, there is provided a kind of method of the above-mentioned display device brightness homogeneity of increase, including：
Under pure color picture, the display panel is chosen up to a little less as impact point；
Test is under different pieces of information signal voltage, and the relation between the brightness of the impact point and the direct current pressure drop is bent
Line；
Under same group of data signal voltage, the brightness of the display panel and the length on the side of the display panel first are measured
Relation curve between degree；
The relational expression between brightness and the voltage data signal according to the display panel, obtains the data-signal
Relational expression between the length on voltage and the side of the display panel first；
The relational expression between length according to the voltage data signal and the side of the display panel first, obtains described aobvious
Show the offset voltage of the voltage data signal of panel relevant position；
The voltage data signal of display panel according to the offset voltage amendment.
In a kind of exemplary embodiment of the disclosure, the impact point is located at the centre position of the display panel.
In a kind of display device of embodiment of the disclosure, by detecting that IR Drop obtain corresponding voltage data signal
Offset voltage, and according to the voltage data signal of the offset voltage amendment display panel relevant position, so that display surface
Plate brightness shows more homogeneous.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The disclosure can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows the implementation for meeting the disclosure
Example, and it is used to explain the principle of the disclosure together with specification.It should be evident that drawings in the following description are only the disclosure
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 shows the schematic diagram of ELVDD cablings in the prior art.
Fig. 2 shows a kind of schematic diagram of display device in disclosure exemplary embodiment.
Fig. 3 shows the schematic diagram of another display device in disclosure exemplary embodiment.
Fig. 4 shows a kind of flow chart of the method for increasing display device brightness homogeneity in disclosure exemplary embodiment.
Fig. 5-Fig. 6 shows a kind of signal of the method for increasing display device brightness homogeneity in disclosure exemplary embodiment
Figure.
Specific embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be with various shapes
Formula is implemented, and is not understood as limited to example set forth herein；Described feature, structure or characteristic can be with any suitable
Mode combine in one or more implementation methods.In the following description, there is provided many details are so as to be given to this
Disclosed embodiment fully understands.It will be appreciated, however, by one skilled in the art that the technical scheme of the disclosure can be put into practice
And omit one or more in the specific detail, or can be using other methods, constituent element, device, step etc..
It is pointed out that in the accompanying drawings, for the size that may clearly exaggerate layer and region of diagram.And can be with
Understand, when element or layer be referred to as another element or layer " on " when, it directly in other elements, or can there may be
Middle layer.Additionally, it is appreciated that when element or layer are referred to as in another element or layer D score, it can be directly at other
Under element, or there may be the layer or element of more than one centre.In addition, it is to be appreciated that when layer or element are referred to as
Two-layer or two elements " between " when, it can be unique layer between two-layer or two elements, or can also be in the presence of one
Intermediate layer above or element.Reference marker similar in the whole text indicates similar element.
Fig. 1 shows the schematic diagram of ELVDD cablings in the prior art.
Light (English full name at present：Electroluminescent, referred to as：EL) luminous efficiency of device is than relatively low
Making the luminosity of display panel increases, it is necessary to drive thin film transistor (TFT) (English full name：Driving Thin Film
Transistor, referred to as：Driving TFT) one larger DC source of output, and this need to Driving TFT mono- compared with
Big data voltage；When displayer part is in normal work, in order that the luminosity of display panel increases so that
Driving TFT always work at saturation region, and this needs driver IC to supply a driving voltage very high
(Electroluminescent Voltage Device, referred to as：ELVDD)；In view of Driving TFT critical voltage with
Data voltage all than larger, the requirement of maximum data voltage is met for arrival, and current ELVDD is according to maximum data voltage
Come what is provided, it is not intended that other more low level data voltages, therefore driver IC supply drives AMOLED to show
The ELVDD of each frame picture of device is supplied with maximum ELVDD.
With the progress of epoch and technology, large scale, high-resolution displayer part gradually grow up, accordingly
, large scale displayer is also required to the panel and greater number of pixel of large-size, and panel conductor length is increasingly
Long, conductor resistance is also bigger, therefore, supply voltage inevitably produces voltage drop (IR Drop) on wire, and
And, the voltage drop of each image element circuit is different, and the supply voltage for thus resulting in the acquisition of each image element circuit is different, so as to identical
Voltage data signal input under, different image element circuits has different electric currents, brightness output, and then causes whole panel
Display brightness is uneven, and picture is different, and the IR Drop of pixel also can be and then different.
Fig. 2 shows a kind of schematic diagram of display device in disclosure exemplary embodiment.
As shown in Fig. 2 the display device 10 includes display panel 100 and processing unit 200, wherein the display panel
100 include supply voltage detection module 101, and the supply voltage detection module 101 is used to detect the straight of the display panel 100
Stream voltage drop (IR Drop), and the direct current pressure drop is input into the processing unit 200 is processed；The treatment dress
Put the compensation electricity of the 200 voltage data signal Data that the relevant position of display panel 100 is exported according to the direct current pressure drop
Pressure Δ Data, the voltage data signal of the display panel 100 is corrected by the offset voltage Δ Data.
In the embodiment of the present invention, display panel 100 includes pixel cell, and supply voltage detection module 101 is used to gather picture
The voltage of the power supply node of plain unit, and the voltage is sent to processing unit 200, so-called power supply node refers to default being used for
The node being connected with power supply；Processing unit 200 is used to determine according to the voltage of power supply node the voltage variety of power supply node, and
The direct current pressure drop of display panel 100 is determined based on the voltage variety, and corresponding pixel is changed according to the direct current pressure drop
The voltage data signal of unit compensates the voltage variety.
Organic Light Emitting Diode (Organic light emitting diode, OLED) display device exists in the prior art
During display, display panel (Panel) brightness can from Source IN ends to Source END ends due to the influence of IR drop
Taper off trend, and the brightness homogeneity of such Panel will decrease.And the embodiment of the present disclosure is by detecting direct current pressure drop
To obtain the offset voltage of the voltage data signal of respective pixel unit, it is possible to increase the brightness homogeneity of display device.
Fig. 3 shows the schematic diagram of another display device in disclosure exemplary embodiment.
Wherein, display panel is used for display picture, including ELVDD buses, is made up of in the matrix form multiple pixel cells
Pixel unit array, ELVDD leads, be fanned out to the row in (Fanout) area, flexible printer circuit (FPC) and active area surrounding
Drive circuit (GOA) and electrostatic protection (ESD) circuit etc..Wherein, active area is also called pixel region, is ELVDD buses and pixel
Region where cell array, the multiple pixel cells for constituting pixel unit array are connected with ELVDD buses, and ELVDD is total
Line is cabling of the voltage of external power source offer inside display panel, and ELVDD buses are connected to driving by ELVDD leads
IC, is connected between active area and driving IC by Fanout areas, and Fanout areas are driven between IC and the ELVDD buses of active area
Lead where region.
In the embodiment shown in fig. 3, supply voltage detection module 101 includes the first supply voltage detection line (ELVDD1)
With second source voltage detecting line (ELVDD2), it is respectively used to detect first supply voltage and second source of the display panel
Voltage, and by first supply voltage and the second source control source to the processing unit.
In the embodiment shown in fig. 3, the display device also includes source electrode drive circuit (Source Driver), its
In, the first supply voltage detection line (ELVDD1) be disposed in proximity to one end of the source electrode drive circuit (for example most under
End), the other end that the second source voltage detecting line (ELVDD2) is arranged at away from the source electrode drive circuit (is for example most gone up
End).
It should be noted that, although in figure 3, being arranged at the bottom of source electrode drive circuit, ELVDD2 with ELVDD1 and setting
It is placed in as a example by the top of the source electrode drive circuit and illustrates, but in other embodiments, as long as ELVDD1 is disposed in proximity to
One end of source electrode drive circuit, ELVDD2 are arranged at the other end away from the source electrode drive circuit.
In the exemplary embodiment, the display device also includes gate driving circuit (Gate Driver), wherein, institute
The vertical cabling for stating second source voltage detecting line (ELVDD2) can be by the bypass cabling (Pass of the gate driving circuit
Line) it is connected to the processing unit.The other end of source electrode drive circuit is located remotely from due to ELVDD2, if it does not pass through grid
The bypass cabling of pole drive circuit is connected to the processing unit, can influence the width of the frame of display panel, due to ELVDD2 only
There is voltage, do not form loop, no electric current flows through, its cabling can be very thin, therefore it can be by gate driving circuit
Bypass cabling is connected to the processing unit, so as to not interfere with the frame width of display panel.
In the embodiment shown in fig. 3, the processing unit is time schedule controller (TCON).But the disclosure is not limited to
This, it can be any outside that can carry out data processing or internal data processor.
In the embodiment shown in fig. 3, the time schedule controller (TCON) includes analog-digital converter (ADC), described
Analog-digital converter (ADC) is used to for the direct current pressure drop simulated to be converted to data signal.
Ultra-narrow frame display device is pursued with its remarkable visual experience by user.At present, using COF (Chip On
Film, chip on film) technology to be realizing ultra-narrow frame.COF technologies are will to drive IC (Integrated Circuit, integrated electricity
Road) the crystal grain mantle structure dress technology that is fixed on FPC.The technology is incorporated into display device, display dress can be reduced
The size of the circuit region (also referred to as PAD region) put, so as to realize ultra-narrow frame.
The embodiment of the present invention inside Panel by increasing by 2 ELVDD detection lines (ELVDD1 and ELVDD2), a position
In Source IN ends (ELVDD1), one is located at Source END ends (ELVDD2), and the ELVDD2 at Source END ends passes through
The Pass line of Gate COF are connected on PCB, are ultimately connected on the ADC analog-digital converters on TCON.Due to this
ELVDD2 does not walk electric current, it is possible to cabling is connected from COF.
In the embodiment shown in fig. 3, the display panel includes latticed supply voltage cabling, wherein, it is described aobvious
Show that the length of the supply voltage cabling of panel is directly proportional to the resistance of the display panel.Wherein, typically it is defaulted as latticed
ELVDD cablings, can make resistance R in display panel than more uniform, so, the length S and resistance R of the ELVDD lines of Panel into
Proportional relation.But the disclosure is not limited to this, in other embodiments, or other shapes supply voltage cabling,
As long as it is full panel averagely laying.
In the exemplary embodiment, the display device is OLED display.Organic Light Emitting Diode (OLED) turns into
Domestic and international very popular emerging flat-panel screens product, because OLED display has self-luminous, wide viewing angle, short reaction
Time, high-luminous-efficiency, wide colour gamut, low-work voltage, panel is thin, can make large scale and the panel and processing procedure of deflection are simple
Etc. characteristic, and it also has the potentiality of low cost.
Disclosure implementation method is the output by monitoring the IR Drop of Panel to control Data, makes Panel in display
Shi Liangdu can be more homogeneous, increases brightness homogeneity.Wherein, designed for latticed ELVDD, it is minimum by increasing Panel
End and the ELVDD detection lines of top, the vertical cabling of detection line reduce impedance by the Pass line of Gate COF, most
The ELVDD in 2 detection lines can be gathered by TCON eventually, after carrying out data processing, the Data of the diverse location by changing output
To realize increasing the brightness homogeneity of Panel.
Using the technical scheme of the embodiment of the present invention, by real-time detection display panel least significant end and the ELVDD of top
Supply voltage on lead, and according to the variation delta ELVDD of the least significant end and the supply voltage of top come adjust data letter
The offset voltage of number Voltage Feedback to display panel ELVDD leads so that no matter display display panel active area is shown in what
Hold, the offset voltage for feeding back to display panel ELVDD leads can change with the change of display picture, realize to display surface
Plate active area IR drop enter Mobile state compensation, so that display panel active area has unified and stabilization ELVDD voltages, enter
And effectively improve the display image quality of display device.
Additionally, in other exemplary embodiments of the disclosure, miscellaneous part can also be included in the display device.Cause
This, the technical scheme for increasing more structures also belongs to the protection domain of the disclosure.
Fig. 4 shows a kind of flow chart of the method for increasing display device brightness homogeneity in disclosure exemplary embodiment.
As shown in figure 4, the method for the increase display device brightness homogeneity, may comprise steps of.
In the step s 100, under pure color picture, the display panel is chosen up to a little less as impact point.
Here so-called pure color picture, refers to that the picture that whole display panel shows is consistent, be for example all white or
Person's black etc..
In the exemplary embodiment, the impact point is located at the centre position of the display panel.It should be noted that this
In so-called centre position can be less accurate, the centre position of the display panel is located substantially at, because human eye vision
The change of the brightness of counter plate does not have so sensitive.
In step s 110, test is under different pieces of information signal voltage, the brightness of the impact point and the DC voltage
Relation curve between drop.
In the step s 120, under same group of data signal voltage, the brightness and the display of the display panel are measured
Relation curve between the length on the side of panel first.
Because display panel is generally rectangle, with two short sides and two sides long.In the embodiment of the present invention, first side
Refer to the short side of display panel, but the disclosure is not construed as limiting to this.
In step s 130, according to the display panel relational expression between brightness and the voltage data signal, obtains
Relational expression between the length on the voltage data signal and the side of the display panel first.
In step S140, the relation between length according to the voltage data signal and the side of the display panel first
Formula, obtains the offset voltage of the voltage data signal of the display panel relevant position.
In step S150, the voltage data signal of display panel according to the offset voltage amendment.
Fig. 5-Fig. 6 shows a kind of signal of the method for increasing display device brightness homogeneity in disclosure exemplary embodiment
Figure.
First, such as Fig. 5, under pure color picture, choose in the middle of on panel a little as impact point, test out different Data
Under, the relation curve between this brightness L and △ ELVDD；Then, such as Fig. 6, under same group of Data, the brightness L of panel is measured
With the relation curve of the length S of panel short side；And the brightness L and Data of panel have certain relational expression, can now obtain
Relational expression between Data and panel bond length S, you can make TCON export Data+ △ Data, so that panel luminance is aobvious
Show more homogeneous, increase brightness homogeneity.
The method of the increase display device brightness homogeneity that disclosure implementation method is provided, by increasing ELVDD detection lines,
Compensation IR Drop, increase panel luminance homogeneity.
Additionally, the detail of each step is corresponding aobvious in the method for above-mentioned increase display device brightness homogeneity
It is described in detail in showing device, therefore here is omitted.And, although describing this with particular order in the accompanying drawings
Each step of method in open, but, this does not require that or implies must perform these steps according to the particular order,
Or the step having to carry out shown in whole could realize desired result.It is additional or alternative, it is convenient to omit some steps,
Multiple steps are merged into a step to perform, and/or a step is decomposed into execution of multiple steps etc..
Those skilled in the art will readily occur to its of the disclosure after considering specification and putting into practice invention disclosed herein
Its embodiment.The application is intended to any modification, purposes or the adaptations of the disclosure, these modifications, purposes or
Person's adaptations follow the general principle of the disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.Description and embodiments are considered only as exemplary, and the true scope of the disclosure and spirit are by appended
Claim is pointed out.
Claims (10)
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