CN105448233B - The driving method and organic LED display device of OLED pixel - Google Patents
The driving method and organic LED display device of OLED pixel Download PDFInfo
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- CN105448233B CN105448233B CN201410425977.8A CN201410425977A CN105448233B CN 105448233 B CN105448233 B CN 105448233B CN 201410425977 A CN201410425977 A CN 201410425977A CN 105448233 B CN105448233 B CN 105448233B
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Abstract
The invention discloses the driving method and organic LED display device of a kind of OLED pixel, driving method includes：Set the first time interval T in the frame period of each scanning1；Set the acquiescence grayscale value of the OLED pixel；It calculates in the first time interval T1The OLED pixel is inside made to reach the first driving current I needed for the acquiescence grayscale value1；And it provides one and is more than the first driving current I1The second driving current I2, set the second time interval T2, in the second time interval T2The interior driving OLED pixel reaches the acquiescence grayscale value；Wherein, T1*I1=T2*I2.Raising electric current in the present invention and the fluorescent lifetime adjusted in each frame period are continuous so that the low grayscale electric current of driver chip output control more easily controls, and increases the application in high gradient panel.
Description
Technical Field
The invention relates to the technical field of display driving, in particular to a driving method of an OLED pixel and an organic light emitting diode display device.
Background
An Organic Light Emitting Diode (OLED) belongs to a carrier dual injection type Light Emitting device, and utilizes the characteristic of electron luminescence, and the Light Emitting mechanism is as follows: under the driving of an external voltage, electrons and holes injected from the electrodes are recombined in the organic material to release energy, and the energy is transferred to molecules of the organic light emitting substance, so that the molecules are excited to transition from a ground state to an excited state, and when the excited molecules return to the ground state from the excited state, the excited molecules are radiated to transition to generate a light emitting phenomenon.
The active-driven OLED device can be divided into voltage driving and current driving according to different driving modes, wherein the voltage driving refers to a driving mode in which an input signal of a pixel circuit is a voltage signal, and the current driving refers to a driving mode in which the pixel circuit takes a current as an input signal. The current type pixel driving circuit is directly driven by current, and the output and the input are in a linear relation, so that the current is conveniently adjusted. However, since each gray level in the current driving method is provided by a driver, two problems are easily occurred at low current: firstly, the low current output by the driving circuit chip is difficult to be accurately controlled; second, the current drive is a constant current charge, which can take too long at low current, limiting the application of this method to low current.
According to the scientific common sense, the brightness sensed by human eyes is the result of time and intensity integration, in the current driving mode, most of the time of the whole frame is in a light-emitting form, fig. 1 a-1 b are schematic diagrams of the light-emitting duration and the current magnitude in each frame in the current driving mode, respectively, the horizontal axis in fig. 1b represents the gray scale magnitude, and the vertical axis represents the current I magnitude.
Chinese patent publication No. CN102708798A provides a pixel cell driving circuit, a driving method, a pixel cell, and a display device, which are used to solve the problem that the charging speed of the storage capacitor Cst is slow, and particularly in low gray scale, the charging time is long, and the conventional pixel cell driving technology is not suitable for AMOLED display with high resolution and high refresh rate. The pixel unit driving circuit comprises a sixth transistor, a switch unit, a storage capacitor, a first transistor and a second transistor, and the technical scheme accelerates the charging speed of the storage capacitor. Wherein Idata is a large current, thereby accelerating the charging speed of the storage capacitor, and the technical scheme comprises a first stage of a pre-charging stage (Precharge) and a second stage of a light-emitting stage (Update).
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a driving method for an OLED pixel and an organic light emitting diode display device, so as to improve the disadvantages of OLED current driving, make the low gray scale current controlled by the driver chip output easier to control, and increase the applications in high-level panels.
The purpose of the invention can be realized by the following technical scheme:
in one aspect, a method for driving an OLED pixel is provided, including:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at said first time interval T1A first drive current I required to drive the OLED pixel to the default gray level value1(ii) a And
providing a current larger than the first drive current I1Second drive current I2Setting a second time interval T2At said second time interval T2Internally driving the OLED pixels to the default gray scale value; wherein, T1*I1＝T2*I2。
The OLED pixel driving method comprises applying the second driving current I2To the first drive current I1Will be at each of said first time intervals T at the same time1Of said second time interval T2Is adjusted to the first time interval T11/3 of (1).
In another aspect, a method for driving an OLED pixel is provided, which includes:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at said first time interval T1A first drive current I required to drive the OLED pixel to the default gray level value1(ii) a And
providing a second drive current I2During a set second timeSeparate T2Internally driving the OLED pixels to the default gray scale value;
wherein the second drive current I2Is greater than the first drive current I1And the second time interval T2Less than said first time interval T1。
The OLED pixel driving method comprises applying the second driving current I2To the first drive current I1Will be simultaneously at each of said first time intervals T1Of said second time interval T2Is adjusted to the first time interval T11/3 of (1).
The OLED pixel driving method comprises applying the second driving current I2To the first drive current I1Will be at each of said first time intervals T at the same time1Of said second time interval T2Is adjusted to the first time interval T11/2 of (1).
In still another aspect, an organic light emitting diode display device is provided, wherein the light emitting display adopts a driving method of any one of the OLED pixels as described above.
Compared with the prior art, the invention has the beneficial effects that: different from the prior art that the charging speed of the storage capacitor needs to be accelerated by a pre-charging stage, the current is increased and the light-emitting time in each frame period is adjusted continuously, so that the low-gray-scale current controlled by the output of the driver chip is easier to control, and the application of the driver chip on a high-level panel is increased.
Drawings
FIG. 1a is a schematic diagram showing the light emitting duration in each frame in the conventional driving method;
FIG. 1b is a schematic diagram illustrating a current magnitude curve in a conventional driving method;
FIG. 2a is a schematic diagram showing the light emitting duration of each frame in the driving manner of the first embodiment of the driving method for OLED pixels according to the present invention;
FIG. 2b is a schematic diagram showing a current magnitude curve in a driving manner according to a first embodiment of the driving method for an OLED pixel of the present invention;
FIG. 3a is a schematic diagram showing the light emitting duration of each frame in the driving method of the second embodiment of the OLED pixel driving method according to the present invention;
FIG. 3b is a schematic diagram showing a current magnitude curve in a driving manner according to a second embodiment of the driving method of an OLED pixel of the present invention;
FIG. 4a is a schematic diagram showing the light emitting duration of each frame in the driving method of the third embodiment of the OLED pixel driving method according to the present invention;
fig. 4b is a schematic diagram showing a current magnitude curve in a driving manner according to a third embodiment of the driving method of the OLED pixel of the present invention.
Detailed Description
The invention is further described below in conjunction with the schematic drawings and the specific operating examples.
The invention discloses a driving method of an OLED pixel, which comprises the following steps:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at a first time interval T1A first driving current I required to drive the OLED pixel to a predetermined gray level1(ii) a And
providing a current larger than the first driving current I1Second drive current I2Setting a second time interval T2At a second time interval T2Internally driving the OLED pixels to a default gray level value; wherein, T1*I1＝T2*I2。
Or,
a driving method of an OLED pixel is provided, which comprises:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at a first time interval T1A first driving current I required to drive the OLED pixel to a predetermined gray level1(ii) a And
providing a second drive current I2At a set second time interval T2Internally driving the OLED pixels to a default gray level value;
wherein the second drive current I2Greater than the first drive current I1And a second time interval T2Less than a first time interval T1。
Example one
As a preferred embodiment of the present invention, as shown in FIG. 2a, the second driving current I is set2To the first drive current I1Will be at each first time interval T at the same time1Inner second time interval T2Adjusted to a first time interval T11/3 indicates that the luminance of the emitted light is increased by 3 times, and the luminance perceived by the human eye is a result of integration of time and intensity, so that the luminance perceived by the human eye in the adjusted driving method is close to the original luminance.
Example two
As a sub-preferred embodiment of the present invention, as shown in FIG. 3a, the second driving current I is set2To the first drive current I12 times of the total amount of the active ingredient, will be in every secondA time interval T1Inner second time interval T2Adjusted to a first time interval T11/3, since the luminance perceived by the human eye is the result of the time-dependent intensity integration, the luminance exhibited by the driving method perceived by the human eye after adjustment is close to the original luminance.
EXAMPLE III
Also as a sub-preferred embodiment of the present invention, as shown in FIG. 4a, the second driving current I is set2To the first drive current I1Will be at each first time interval T at the same time1Inner second time interval T2Adjusted to a first time interval T11/2 of (1).
The present invention additionally encompasses an organic light emitting diode display device comprising a glass substrate, a thin film transistor array layer on the substrate, and an organic light emitting layer on the thin film transistor array layer. The organic light emitting layer forms a plurality of organic light emitting diode pixels on the Thin Film Transistor array layer, and the organic light emitting diode pixels are driven by the actions of the plurality of scanning lines, the plurality of data lines and the plurality of Thin Film transistors. The organic light emitting diode display device adopts the driving method of the OLED pixels to drive each OLED pixel to display the default gray-scale value.
The improvement of the current and the adjustment of the light emitting time in each frame period are continuous, so that the low gray scale current output and controlled by the driver chip is easier to control, and the application of the driver chip in a high-level panel is increased.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the above-described embodiments, which are only examples. Any equivalent modifications and substitutions for those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (6)
1. A method for driving an OLED pixel, comprising:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at said first time interval T1A first drive current I required to drive the OLED pixel to the default gray level value1(ii) a And
providing a current larger than the first drive current I1Second drive current I2At the first time interval T1Internally setting a second time interval T2At said second time interval T2Internally driving the OLED pixels to the default gray scale value; wherein, T1*I1＝T2*I2。
2. The method of driving an OLED pixel according to claim 1, wherein the second drive current I is applied2Is set to the first drive current I1Will be at each of said first time intervals T at the same time1Of said second time interval T2Is adjusted to the first time interval T11/3 of (1).
3. A method for driving an OLED pixel, comprising:
setting a first time interval T in a frame period of each scan1；
Setting a default gray-scale value of the OLED pixel;
calculating at said first time interval T1A first drive current I required to drive the OLED pixel to the default gray level value1(ii) a And
providing a second drive current I2At said first time interval T1Internally set second time interval T2Internally driving the OLED pixels to the default gray scale value;
wherein the second drive current I2Is greater than the first drive current I1And the second time interval T2Less than said first time interval T1。
4. The method of driving an OLED pixel according to claim 3, wherein the second drive current I is applied2Is set to the first drive current I1Will be simultaneously at each of said first time intervals T1Of said second time interval T2Is adjusted to the first time interval T11/3 of (1).
5. The method of driving an OLED pixel according to claim 3, wherein the second drive current I is applied2Is set to the first drive current I1Will be at each of said first time intervals T at the same time1Of said second time interval T2Is adjusted to the first time interval T11/2 of (1).
6. An organic light emitting diode display device, wherein the light emitting display employs the driving method of the OLED pixel according to any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410425977.8A CN105448233B (en) | 2014-08-26 | 2014-08-26 | The driving method and organic LED display device of OLED pixel |
| TW104113428A TWI584257B (en) | 2014-08-26 | 2015-04-27 | Organic light emitting diode display device and oled pixel driving method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410425977.8A CN105448233B (en) | 2014-08-26 | 2014-08-26 | The driving method and organic LED display device of OLED pixel |
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| CN105448233A CN105448233A (en) | 2016-03-30 |
| CN105448233B true CN105448233B (en) | 2018-06-26 |
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| CN112767872A (en) * | 2019-11-01 | 2021-05-07 | 京东方科技集团股份有限公司 | Pixel driving chip, driving method thereof and display device |
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| WO2002089103A2 (en) * | 2001-04-26 | 2002-11-07 | Koninklijke Philips Electronics N.V. | Display device |
| JP2005157203A (en) * | 2003-11-28 | 2005-06-16 | Tohoku Pioneer Corp | Driving device and method of light emitting display panel |
| JP2008503784A (en) * | 2004-06-22 | 2008-02-07 | 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 | Driving to reduce aging in active matrix LED displays |
| JP2007178837A (en) * | 2005-12-28 | 2007-07-12 | Matsushita Electric Ind Co Ltd | Organic el display apparatus |
| KR100784036B1 (en) * | 2006-06-08 | 2007-12-10 | 삼성에스디아이 주식회사 | Organic light emitting display device and driving method thereof |
| CN101500361B (en) * | 2009-03-03 | 2012-07-04 | 友达光电股份有限公司 | Light emitting diode driving device and driving method thereof |
| KR101289651B1 (en) * | 2010-12-08 | 2013-07-25 | 엘지디스플레이 주식회사 | Liquid crystal display and scanning back light driving method thereof |
| KR101476880B1 (en) * | 2011-09-29 | 2014-12-29 | 엘지디스플레이 주식회사 | Organic light emitting diode display device |
| CN102708798B (en) * | 2012-04-28 | 2015-05-13 | 京东方科技集团股份有限公司 | Pixel unit driving circuit, driving method, pixel unit and display device |
| KR101943417B1 (en) * | 2012-06-11 | 2019-04-17 | 삼성전자주식회사 | Apparatus and Method for Displaying Image, Apparatus and Method for Driving Light Emitting Device |
| CN102800281B (en) * | 2012-08-14 | 2015-07-15 | 昆山工研院新型平板显示技术中心有限公司 | Drive method and drive device for optimizing power dissipation of AMOLED panel |
| CN102842297B (en) * | 2012-08-31 | 2015-09-09 | 京东方科技集团股份有限公司 | Control the method for GTG, GTG control device and liquid crystal display |
| CN102984860B (en) * | 2012-11-21 | 2014-12-31 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) dimming drive module, backlight module and liquid crystal display device |
| CN103218969B (en) * | 2013-03-12 | 2015-06-10 | 惠州雷曼光电科技有限公司 | Image displaying method, driving device and displaying system |
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| CN105448233A (en) | 2016-03-30 |
| TWI584257B (en) | 2017-05-21 |
| TW201608553A (en) | 2016-03-01 |
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Address after: 201506, building two, building 100, 1, Jinshan Industrial Road, 208, Shanghai, Jinshan District Patentee after: Shanghai Hehui optoelectronic Co., Ltd Address before: 201506, building two, building 100, 1, Jinshan Industrial Road, 208, Shanghai, Jinshan District Patentee before: EverDisplay Optronics (Shanghai) Ltd. |