CN102750903B - Organic light emitting display system and brightness ununiformity eliminating method of organic light emitting display system - Google Patents
Organic light emitting display system and brightness ununiformity eliminating method of organic light emitting display system Download PDFInfo
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Abstract
The invention discloses an organic light emitting display system and a brightness nonuniformity eliminating method of the organic light emitting display system. The conduction voltage Vth value of each OLED (organic light emitting diode) device is calculated, then, the amplitude value of the display data voltage is changed through the conduction voltage Vth value for compensating the Vth difference, so the problem of brightness nonuniformity of an organic light emitting display is eliminated, the display quality of the organic light emitting display is improved, and the user experience is enhanced. The organic light emitting display system disclosed by the invention can be integrated in a display panel (such as an OLED panel), and the display panel can be installed in various electronic devices such as mobile telephones, digital cameras, mobile phones, notebook computers and the like.
Description
Technical field
The present invention relates to a kind of organic light emitting display technology, specifically, is a kind of organic light emitting display system can eliminating brightness irregularities, and eliminates the method for organic light emitting display brightness irregularities.
Background technology
Along with the progress of science and technology, liquid crystal display (Liquid Crystal Display, LCD) because its volume is little and lightweight advantage, replace the comparatively huge cathode-ray tube of traditional volume (Cathode Ray Tube gradually, CRT), the electronic products such as display, notebook computer, flat panel TV, digital camera have been widely used in.
LCD needs by light emitting diode (Light Emitting Diode, LED) as back light.And Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) display is not owing to needing backlight module, be more suitable for thin display, and there is the advantage without angle limitations, therefore have the trend replacing traditional C RT and LCD.
But the major issue that OLED display faces now is brightness irregularities (mura effect).In an OLED display, the brightness (luminance) of each OLED because of technique or the loss difference to some extent used, can be easy to the phenomenon of brightness irregularities.The intensity loss speed of OLED element is relevant especially with following several factors, comprises the type of drive etc. of the characteristic of this OLED element, process environments, OLED element.In addition, the problem of brightness irregularities is especially serious on Full-color OLED display.A Full-color OLED display has the OLED assembly of red, green, blue three kinds of colors.The intensity loss speed of these three kinds of assemblies is different, and after a long time use, the luminance difference of the OLED assembly of three kinds of colors can be more obvious.
So for OLED display, brightness irregularities is an important technical matters, the technical barrier that Ye Shige great producer one of will face and capture is important.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of organic light emitting display system and eliminates the method for brightness irregularities, the problem of existing organic light emitting display brightness irregularities can be solved, thus make the brightness uniformity of organic light emitting display, improve display quality, strengthen Consumer's Experience.
In order to solve the problems of the technologies described above, the invention provides a kind of organic light emitting display system, comprise picture element matrix and compensating unit, described picture element matrix comprises multiple pixel cell, each described pixel cell comprises driving thin film transistor (TFT) TFT and Organic Light Emitting Diode OLED, described system also comprises data processing unit, and described pixel cell comprises test module, wherein:
The image element circuit of described test module for utilizing test signal to drive pixel cell, the voltage of drive TFT source electrode under acquisition test signal;
The voltage that described data processing unit is used for the drive TFT source electrode obtained according to described test module calculates the forward voltage V of drive TFT
th;
Described compensating unit is used for the forward voltage V calculated according to described data processing unit
ththe display data signal of respective pixel unit is corrected.
Further, described test module comprises the first switching TFT and second switch TFT, and the source electrode of described first switching TFT connects power supply, drain electrode connection data line, and grid connects the first sweep trace; The source electrode of described second switch TFT connects the grid of drive TFT, and drain electrode connection data line, grid connects the second sweep trace.
Further, also comprise storage unit, for storing the forward voltage V of the drive TFT that described data processing unit calculates
th; Described compensating unit reads described forward voltage V from described storage unit
th.
Further, described data processing unit comprises:
Analog/digital converter, for receiving the voltage parameter of the drive TFT source electrode that described test module obtains, converting digital signal to and exporting;
Computing module, for receiving the digital signal that described analog/digital converter exports, calculates the forward voltage V of drive TFT
th.
Further, described compensating unit comprises:
Correction module, for the forward voltage V calculated according to described data processing unit
ththe display data signal of corresponding OLED is corrected;
Digital/analog converter, converts voltage signal to for the data-signal after being corrected by described correction module, is sent to data line, by data line, this voltage signal is transferred to corresponding pixel cell, drives the OLED of respective pixel unit luminous.
Present invention also offers and a kind ofly eliminate the uneven method of organic light emitting display system brightness, comprising:
S1, utilize test signal to drive the image element circuit of pixel cell, under obtaining test signal, drive the voltage of thin film transistor (TFT) TFT source electrode;
S2, calculate the forward voltage V of drive TFT according to the voltage of drive TFT source electrode
th;
S3, according to forward voltage V
ththe display data signal of respective pixel unit is corrected.
Further, in described step S1, each pixel cell obtains the voltage of two groups of drive TFT source electrodes by least two test signals.
Further, in described step S1, utilize test signal to drive the image element circuit of pixel cell, under obtaining test signal, drive the method for the voltage of thin film transistor (TFT) TFT source electrode to be:
S11, with first test signal drive pixel cell, within the T1 time, the second sweep trace conducting second switch TFT, by the data line voltage V under the first test signal
g1be latched into memory capacitance, and control drive TFT makes OLED luminous;
S12, within the T2 time, the first sweep trace conducting first switching TFT, data processing unit detects the voltage V of the drive TFT source electrode obtained under the first test signal
s1;
S13, with second test signal drive pixel cell, within the T3 time, the second sweep trace conducting second switch TFT, by the data line voltage V under the second test signal
g2be latched into memory capacitance, and control drive TFT makes OLED luminous;
S14, within the T4 time, the first sweep trace conducting first switching TFT, data processing unit detects the voltage V of the drive TFT source electrode obtained under the second test signal
s2.
Further, in described step S2, obtained the forward voltage V of drive TFT by following formulae discovery according to the voltage of drive TFT source electrode
th:
Wherein, V
ddfor the supply voltage of pixel cell.
Further, the forward voltage V of described drive TFT will be obtained in described step S2
thstore in the memory unit, according to the forward voltage V read from storage unit in described step S3
ththe display data signal of respective pixel unit is corrected.
Further, when receiving a test instruction, re-execute described step S1 and S2, and the forward voltage V of new drive TFT that will obtain
threplace original forward voltage V in storage unit
th.
Further, according to forward voltage V
thto the method that the display data signal of respective pixel unit corrects be: by forward voltage V in the display data signal weighting of respective pixel unit
thvalue.
The present invention is by calculating the forward voltage V of each OLED
thvalue, then according to this forward voltage V
ththe amplitude that value changes display data voltage compensates V
thdifference, thus eliminate the problem of organic light emitting display brightness irregularities, improve the display quality of organic light emitting display, enhance Consumer's Experience.Organic light emitting display system of the present invention can be incorporated in display panel (as oled panel), and this display panel can be installed in multiple electronic installation, as mobile phone, digital camera, mobile phone, notebook computer etc.
Accompanying drawing explanation
Fig. 1 is the theory diagram of organic light emitting display system one embodiment of the present invention.
Fig. 2 is the process flow diagram of uneven method one embodiment of elimination organic light emitting display system brightness of the present invention.
Fig. 3 is the working signal waveform being driven pixel cell in the present invention by test signal.
Fig. 4 is the process flow diagram of uneven another embodiment of method of elimination organic light emitting display system brightness of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, and to make those skilled in the art the present invention may be better understood and can be implemented, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, one embodiment of organic light emitting display system 100 of the present invention, comprise picture element matrix 10 and compensating unit 40, picture element matrix 10 comprises multiple pixel cell 11, and each pixel cell 11 comprises drive TFT (Thin Film Transistor, thin film transistor (TFT)) 114 and OLED(Organic Light Emitting Diode) 115, wherein, the source electrode of drive TFT 114 connects power supply, and drain electrode connects the positive pole of OLED115, the minus earth of OLED115.Organic light emitting display system 100 of the present invention also comprises data processing unit 20, and also comprises test module in pixel cell 11, wherein:
The image element circuit of test module for utilizing test signal to drive pixel cell 11, the voltage of drive TFT 114 source electrode under acquisition test signal;
Data processing unit 20 calculates the forward voltage V of drive TFT 114 for the voltage of drive TFT 114 source electrode obtained according to test module
th;
The forward voltage V of compensating unit 40 for calculating according to data processing unit 20
ththe display data signal of respective pixel unit 11 is corrected.
Wherein, test module comprises again the first switching TFT 111 and second switch TFT113, and the source electrode of the first switching TFT 111 connects power supply, drain electrode connection data line Date, and grid connects the first sweep trace Scan1; The source electrode of second switch TFT113 connects the grid of drive TFT 114, and drain electrode connection data line Data, grid connects the second sweep trace Scan2.Between the grid and source electrode of drive TFT 114, also string has memory capacitance 112.
Data processing unit 20 comprises analog/digital converter 21 and computing module 22, and analog/digital converter 21, for receiving the voltage parameter of drive TFT 114 source electrode of test module acquisition, converts digital signal to and exports; The digital signal that computing module 22 exports for receiving analog/digital converter 21, calculates the forward voltage V of drive TFT 114
th.
Compensating unit 40 comprises correction module 42 and digital/analog converter 41, the forward voltage V of correction module 42 for calculating according to data processing unit 20
ththe display data signal of corresponding OLED is corrected; Digital/analog converter 41 converts voltage signal to for the display data signal after being corrected by correction module 42, is sent to data line, by data line, this voltage signal is transferred to corresponding pixel cell 11, drives the OLED115 of respective pixel unit 11 luminous.
Organic light emitting display system 100 of the present invention can also comprise storage unit 30, the forward voltage V of drive TFT of storage unit 30 for storing data processing unit 20 and calculating
th; Compensating unit 40 reads forward voltage V from storage unit 30
th.
As shown in Figure 2, the method that elimination organic light emitting display system brightness of the present invention is uneven is:
Step S1, utilize test signal to drive the image element circuit of pixel cell, under obtaining test signal, drive the voltage of thin film transistor (TFT) TFT source electrode;
Step S2, calculate the forward voltage V of drive TFT according to the voltage of drive TFT source electrode
th;
Step S3, according to forward voltage V
ththe display data signal of respective pixel unit is corrected.
Preferably, each pixel cell obtains the voltage of two groups of drive TFT source electrodes by least two test signals, with eliminate the passage breadth length ratio of drive TFT 114, electric capacity between drive TFT 114 grid and its passage, drive TFT 114 the factor such as electron mobility to calculating V
ththe impact of value.
Particularly, as shown in Figure 3, first drive pixel cell by the first test signal, within the T1 time, the second sweep trace Scan2 conducting second switch TFT113, by the data line voltage V under the first test signal
g1be latched into memory capacitance 112, and control drive TFT 114 makes OLED115 luminous; Within the T2 time, the first sweep trace Scan1 conducting first switching TFT 111, the analog/digital converter 21 of data processing unit 20 can detect the voltage V of drive TFT 114 source electrode under the first test signal
s1; Therefore the electric current I of drive TFT 114 is flowed through
d1be formulated as:
（1）
Wherein, W/L is the passage breadth length ratio of drive TFT 114, C
oxfor the electric capacity between drive TFT 114 grid and its passage, u represents the electron mobility of drive TFT 114, V
g1s1be the voltage under the first test signal between drive TFT 114 grid and source electrode, V
thfor the forward voltage of drive TFT 114.
Again because the supply voltage V of the pixel cell of outside supply OLED display
ddbe fixing, flow through the electric current I of drive TFT 114
d1can also represent with another one formula:
（2）
Wherein R is the resistance of power source supply end to drive TFT 114 source electrode of pixel cell 11.
Then, drive pixel cell by the second test signal, within the T3 time, the second sweep trace conducting second switch TFT, by the data line voltage V under the second test signal
g2be latched into memory capacitance, and control drive TFT makes OLED luminous; Within the T4 time, the first sweep trace conducting first switching TFT, data processing unit detection obtains the voltage V of the drive TFT source electrode under the second test signal
s2.
In like manner, the electric current I of drive TFT 114 is flowed through
d2for:
（3）
（4）
In above-mentioned formula (3), (4), V
g2s2be the voltage under the first test signal between drive TFT 114 grid and source electrode.
Order
(5)
Because W/L, C
ox, u design and product output after can obtain, so all giving tacit consent to A is known quantity.
The forward voltage V of drive TFT can be drawn by formula (1), (2), (3), (4), (5)
thcomputing formula be:
（6）。
In addition, the method that elimination organic light emitting display system brightness of the present invention is uneven as shown in Figure 4, can also calculate the forward voltage V of drive TFT at the computing module 22 by data processing unit 20
thafter, it can be used as performance parameter to be stored in storage unit 30.Performance parameter in storage unit 30 can retest when display system 100 receives a test instruction and upgrade.Namely, when receiving a test instruction, described step S1 and S2 is re-executed, and the forward voltage V of new drive TFT that will obtain
threplace original forward voltage V in storage unit
th.Test instruction manually can be assigned by user, also automatically can trigger when meeting one and being pre-conditioned.Pre-conditioned can be such as, after every 150 the startup display systems 100 of setting or display system 100 work 200 hours, retest performance parameter and upgrade.
When there being outer video signal to enter display system 100, first correction module 41 reads the performance parameter of each pixel cell from storage unit 30; Then the due data voltage of each OLED is calculated; Afterwards the data voltage of each pixel cell is processed again, all add corresponding V
thvalue, like this, the current expression of pixel cell OLED115 becomes:
（7）
In formula, V
gsfor the voltage between drive TFT under display data signal 114 grid and source electrode.As can be seen from formula (7), OLED assembly 115 electric current is not by the V of drive TFT 114
thimpact, only relevant with supply voltage with display data voltage.Therefore, described in step S3 according to forward voltage V
thcarry out correcting to the data-signal of respective pixel unit and be exactly: by forward voltage V in the display data signal weighting of respective pixel unit
thvalue, after digital-to-analogue conversion, pass through data line Data by revised voltage writing pixel unit 11, drive TFT 114 makes OLED115 luminous.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (8)
1. an organic light emitting display system, comprise picture element matrix and compensating unit, described picture element matrix comprises multiple pixel cell, each described pixel cell comprises driving thin film transistor (TFT) TFT and Organic Light Emitting Diode OLED, it is characterized in that, described system also comprises data processing unit, and described pixel cell comprises test module, wherein:
The image element circuit of described test module for utilizing test signal to drive pixel cell, makes OLED luminous, the voltage of drive TFT source electrode under acquisition test signal;
The voltage that described data processing unit is used for the drive TFT source electrode obtained according to described test module calculates the forward voltage V of drive TFT
th;
Described compensating unit is used for the forward voltage V calculated according to described data processing unit
ththe display data signal of respective pixel unit is corrected;
Wherein, described test module comprises the first switching TFT and second switch TFT, and the source electrode of described first switching TFT connects power supply, drain electrode connection data line, and grid connects the first sweep trace; The source electrode of described second switch TFT connects the grid of drive TFT, drain electrode connection data line, and grid connects the second sweep trace; The source electrode of described drive TFT connects power supply, and drain electrode connects the positive pole of OLED, the minus earth of described OLED; Memory capacitance is connected in series between the grid of described drive TFT and source electrode.
2. system according to claim 1, is characterized in that, also comprises storage unit, for storing the forward voltage V of the drive TFT that described data processing unit calculates
th; Described compensating unit reads described forward voltage V from described storage unit
th.
3. system according to claim 1 and 2, is characterized in that, described data processing unit comprises:
Analog/digital converter, for receiving the voltage parameter of the drive TFT source electrode that described test module obtains, converting digital signal to and exporting;
Computing module, for receiving the digital signal that described analog/digital converter exports, calculates the forward voltage V of drive TFT
th.
4. system according to claim 1, is characterized in that, described compensating unit comprises:
Correction module, for the forward voltage V calculated according to described data processing unit
ththe display data signal of corresponding OLED is corrected;
Digital/analog converter, converts voltage signal to for the data-signal after being corrected by described correction module, is sent to data line, by data line, this voltage signal is transferred to corresponding pixel cell, drives the OLED of respective pixel unit luminous.
5. eliminate the method that organic light emitting display system brightness is uneven, it is characterized in that, comprising:
S1, utilize test signal to drive the image element circuit of pixel cell, make OLED luminous, under obtaining test signal, drive the voltage of thin film transistor (TFT) TFT source electrode;
S2, calculate the forward voltage V of drive TFT according to the voltage of drive TFT source electrode
th;
S3, according to forward voltage V
ththe display data signal of respective pixel unit is corrected;
Wherein, in described step S1, each pixel cell obtains the voltage of two groups of drive TFT source electrodes by least two test signals, and described step S1 specifically comprises:
S11, with first test signal drive pixel cell, within the T1 time, the second sweep trace conducting second switch TFT, by the data line voltage V under the first test signal
g1be latched into memory capacitance, and control drive TFT makes OLED luminous;
S12, within the T2 time, the first sweep trace conducting first switching TFT, data processing unit detects the voltage V of the drive TFT source electrode obtained under the first test signal
s1;
S13, with second test signal drive pixel cell, within the T3 time, the second sweep trace conducting second switch TFT, by the data line voltage V under the second test signal
g2be latched into memory capacitance, and control drive TFT makes OLED luminous;
S14, within the T4 time, the first sweep trace conducting first switching TFT, data processing unit detects the voltage V of the drive TFT source electrode obtained under the second test signal
s2;
Wherein, the source electrode of described first switching TFT connects power supply, drain electrode connection data line, and grid connects the first sweep trace; The source electrode of described second switch TFT connects the grid of drive TFT, drain electrode connection data line, and grid connects the second sweep trace;
Wherein, in described step S2, obtained the forward voltage V of drive TFT by following formulae discovery according to the voltage of drive TFT source electrode
th:
Wherein, V
ddfor the supply voltage of pixel cell.
6. method according to claim 5, is characterized in that, will obtain the forward voltage V of described drive TFT in described step S2
thstore in the memory unit, according to the forward voltage V read from storage unit in described step S3
ththe display data signal of respective pixel unit is corrected.
7. method according to claim 6, is characterized in that, when receiving a test instruction, re-executes described step S1 and S2, and the forward voltage V of new drive TFT that will obtain
threplace original forward voltage V in storage unit
th.
8. method according to claim 5, is characterized in that, according to forward voltage V
thto the method that the display data signal of respective pixel unit corrects be: by forward voltage V in the display data signal weighting of respective pixel unit
thvalue.
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| CN104240639B (en) * | 2014-08-22 | 2016-07-06 | 京东方科技集团股份有限公司 | A kind of image element circuit, organic EL display panel and display device |
| KR102184906B1 (en) * | 2014-10-22 | 2020-12-02 | 엘지디스플레이 주식회사 | Display device and controller |
| CN104992960B (en) * | 2015-06-08 | 2018-01-30 | 京东方科技集团股份有限公司 | A kind of display panel and its manufacture method, TFT method of testings |
| CN105047139B (en) * | 2015-09-22 | 2018-07-13 | 深圳市华星光电技术有限公司 | The digital driving method of OLED display |
| CN106251810B (en) * | 2016-08-19 | 2019-09-27 | 深圳市华星光电技术有限公司 | AMOLED display panel drive method, driving circuit and display device |
| CN108269525B (en) * | 2017-01-03 | 2020-05-08 | 昆山国显光电有限公司 | AMOLED display device and driving method thereof |
| CN110675814B (en) * | 2019-09-12 | 2021-02-26 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel compensation circuit and pixel circuit |
| CN110730534A (en) * | 2019-10-30 | 2020-01-24 | 广东晟合技术有限公司 | OLED product brightness compensation method |
| CN113674692B (en) * | 2021-09-03 | 2023-04-07 | 深圳市华星光电半导体显示技术有限公司 | Voltage drop compensation method and device and electronic equipment |
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| KR100450761B1 (en) * | 2002-09-14 | 2004-10-01 | 한국전자통신연구원 | Active matrix organic light emission diode display panel circuit |
| JP2006525539A (en) * | 2003-05-02 | 2006-11-09 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Active matrix OLED display with threshold voltage drift compensation |
| US8199074B2 (en) * | 2006-08-11 | 2012-06-12 | Chimei Innolux Corporation | System and method for reducing mura defects |
| CN101968947A (en) * | 2009-07-27 | 2011-02-09 | 友达光电股份有限公司 | Display device system and method for eliminating display device brightness uniformity |
| CN101976545A (en) * | 2010-10-26 | 2011-02-16 | 华南理工大学 | Pixel drive circuit of OLED (Organic Light Emitting Diode) display and drive method thereof |
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