CN109036278B - OLED display and driving method thereof - Google Patents
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Abstract
The invention discloses an OLED display and a driving method thereof, wherein the OLED display comprises the following steps: providing a referenceThe reference voltage range of the reference gamma voltage group is V0min～V0maxThe reference voltage range of the first gamma voltage group is Vxmin～VxmaxThe reference voltage range of the second gamma voltage group is Vymin～VymaxAnd, Vxmin<V0min，Vymax>V0max(ii) a Detecting the threshold voltage offset of a driving transistor of each row of pixels in a row unit in the OLED display and acquiring the minimum offset voltage; and selecting an appropriate gamma voltage group to drive the pixels of a certain row according to the minimum offset voltage of the pixels of the certain row so as to at least completely compensate the minimum offset voltage.
Description
Technical Field
The invention relates to the technical field of displays, in particular to an OLED display and a driving method thereof.
Background
Organic light-emitting diode (OLED) display panels have the advantages of self-luminescence, thin thickness, wide viewing angle, fast response speed, etc., and are representative of a new generation of flat panel display technologies, and are increasingly popular in the industry.
In an OLED display, a transistor (TFT) is usually used to store a signal in combination with a capacitor to control the brightness gray scale of the OLED. For the purpose of constant current driving, each pixel needs at least two TFTs and one storage capacitor to be configured, i.e., 2T1C mode. Fig. 1 is a circuit diagram of a pixel driving circuit of a conventional OLED display. Referring to fig. 1, a pixel of the related OLED display includes two transistors (TFTs) and one capacitor, and particularly, includes one switching transistor T1, one driving transistor T2, and one storage capacitor Cst. The driving current of the OLED is controlled by the driving transistor T2, and the current magnitude is: i isOLED＝k(Vgs-Vth)2Where k is an intrinsic conductivity factor of the driving transistor T2 and is determined by the characteristics of the driving transistor T2 itself, and VthTo drive the threshold voltage, V, of the transistor T2gsIs a voltage between the gate electrode and the source electrode of the driving transistor T2. Driving the crystal due to prolonged operationThreshold voltage V of tube T2thThe drift may occur, which may cause the driving current of the OLED to change, so that the OLED display may have poor display, and the quality of the display image may be affected.
Threshold voltage V for drive transistorthThe problem of drift occurs, and one conventional compensation method is to adjust the gamma voltage to compensate, specifically, first, detect the threshold voltage V of the driving transistor in the display panelthThen dynamically writing the offset value into a gamma voltage generator, which is based on a threshold voltage VthDynamically adjusting the output gamma voltage to correspondingly adjust the data signal voltage, thereby realizing the threshold voltage VthThe deviation value of (a) is compensated. However, when there are more or larger different offset values in the display panel, the gamma voltage generator needs to support the function of high-speed writing, and there are frequent writing operations, which makes the compensation method difficult to implement.
Accordingly, there is a need for improvements and developments in the art.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides an OLED display and a driving method thereof, which improves the threshold voltage V in the OLED displaythThe quality of the display screen is reduced due to the drift.
In order to achieve the purpose, the invention adopts the following technical scheme:
a driving method of an OLED display, comprising:
providing a reference gamma voltage group, at least one first gamma voltage group and at least one second gamma voltage group, wherein the reference voltage range of the reference gamma voltage group is V0min～V0maxThe reference voltage range of the first gamma voltage group is Vxmin～VxmaxThe reference voltage range of the second gamma voltage group is Vymin～VymaxAnd, Vxmin<V0min，Vymax>V0max；
Detecting the threshold voltage offset of a driving transistor of each row of pixels in a row unit in the OLED display and acquiring the minimum offset voltage;
and selecting an appropriate gamma voltage group to drive the pixels of a certain row according to the minimum offset voltage of the pixels of the certain row so as to at least completely compensate the minimum offset voltage.
Specifically, when a certain row of pixels of which the threshold voltage of the driving transistor is not shifted is detected in the OLED display, selecting the reference gamma voltage group to drive the certain row of pixels; selecting the first gamma voltage group to drive the certain row of pixels when the threshold voltage of the driving transistor is detected to shift in the OLED display and the minimum shift voltage is a forward shift; and when the threshold voltage of the driving transistor is detected to be shifted in the OLED display and the minimum offset voltage is negative offset, selecting the second gamma voltage group to drive the certain row of pixels.
Further, setting an offset threshold; if the minimum offset voltage of a certain row of pixels is not larger than the offset threshold value, selecting the reference gamma voltage group to drive the certain row of pixels; if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is forward offset, selecting the first gamma voltage group to drive the certain row of pixels; and if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is negative offset, selecting the second gamma voltage group to drive the certain row of pixels.
Further, the number of the first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage groupxminAre all less than V0min(ii) a The number of the second gamma voltage groups is two or more, the reference voltage ranges of the two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max。
Further, in the first gamma voltage group, Vxmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner; in the second gamma voltage group, Vymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence.
Another aspect of the present invention is to provide an OLED display, including:
a display panel provided with M rows by N columns of pixels, wherein M, N are positive integers;
a threshold voltage detection unit for detecting a threshold voltage shift amount of a drive transistor of each pixel;
a timing controller for inputting a timing control signal and an image signal to the source driver, inputting a timing control signal to the gate driver, and inputting a voltage selection signal to the gamma voltage generating unit;
a gamma voltage generating unit including a reference gamma voltage generator for generating a reference voltage having a range of V, at least one first gamma voltage generator, and at least one second gamma voltage generator0min～V0maxThe first gamma voltage generator is used for generating a reference voltage range of Vxmin～VxmaxThe second gamma voltage generator is used for generating a reference voltage range of Vymin～VymaxOf a second gamma voltage group, wherein Vxmin<V0min，Vymax>V0max；
A source driver receiving a timing control signal and an image signal from the timing controller and a reference voltage from the gamma voltage generating unit, generating a data signal to drive pixels in the display panel;
a gate driver receiving a timing control signal from the timing controller, generating a scan signal to drive pixels in the display panel;
the time sequence controller obtains the minimum offset voltage of each row of pixels according to the threshold voltage offset detected by the threshold voltage detection unit, generates a corresponding voltage selection signal according to the minimum offset voltage of a certain row of pixels, and controls the gamma voltage generation unit to provide a proper gamma voltage group to be input to the source driver to drive the certain row of pixels so as to at least completely compensate the minimum offset voltage.
Specifically, upon detecting a certain row of pixels in which the threshold voltage of the driving transistor is not shifted, the timing controller controls the reference gamma voltage group generated by the reference gamma voltage generator to be input to the source driver to drive the certain row of pixels; when detecting that the threshold voltage of the driving transistor is shifted and the minimum offset voltage is a forward offset, the timing controller controls a first gamma voltage group generated by the first gamma voltage generator to be input to the source driver to drive the certain row of pixels; when detecting that the threshold voltage of the driving transistor shifts and the minimum offset voltage is a negative offset, the timing controller controls the second gamma voltage group generated by the second gamma voltage generator to be input to the source driver to drive the certain row of pixels.
Further, an offset threshold value is preset in the time schedule controller; if the minimum offset voltage of a certain row of pixels is not larger than the offset threshold value, the timing controller controls a reference gamma voltage group generated by the reference gamma voltage generator to be input to the source driver to drive the certain row of pixels; if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is in forward offset, the timing controller controls a first gamma voltage group generated by the first gamma voltage generator to be input to the source driver to drive the certain row of pixels; and if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is negative offset, the timing controller controls a second gamma voltage group generated by the second gamma voltage generator to be input to the source driver to drive the certain row of pixels.
Further, the first gThe number of the ama voltage generators is two or more, the number of the correspondingly generated first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage groupxminAre all less than V0min(ii) a The number of the second gamma voltage generators is two or more, the number of the correspondingly generated second gamma voltage groups is two or more, the reference voltage ranges of the two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max。
Further, V is a first gamma voltage group generated by the first gamma voltage generatorxmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner; v in a second gamma voltage group generated by the second gamma voltage generatorymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence.
According to the OLED display and the driving method thereof provided by the embodiment of the invention, a plurality of gamma voltage generators capable of outputting different reference voltage ranges are arranged, and for each row of pixels in the display, after the threshold voltage offset of a driving transistor is detected and the minimum offset voltage is obtained, a proper gamma voltage group output by one gamma voltage generator is selected to drive the corresponding row of pixels, so that the minimum offset voltage can be completely compensated at least, and other pixels with larger offset can be improved. The driving method does not need to carry out frequent write-in operation and access on the gamma voltage generator, can avoid the reaction time required by dynamic setting of binding points in the gamma voltage generator, reduces the driving complexity and is easy to realize; and proper gamma voltages can be selected respectively for different areas (specifically for each row of pixels) to perform compensation, so that a better compensation effect can be obtained for the whole display area, and the display quality is improved.
Drawings
FIG. 1 is a circuit diagram of a pixel driving circuit of a conventional OLED display;
FIG. 2 is a flow chart of a driving method of an OLED display in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an OLED display in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
The present embodiment provides a driving method of an OLED display, as shown in fig. 2, including:
(a) and providing a plurality of gamma voltage groups with different reference voltage ranges. Specifically, a reference gamma voltage group, at least one first gamma voltage group and at least one second gamma voltage group are provided, the reference voltage range of the reference gamma voltage group is V0min～V0maxThe reference voltage range of the first gamma voltage group is Vxmin～VxmaxThe reference voltage range of the second gamma voltage group is Vymin～VymaxAnd, Vxmin<V0min，Vymax>V0max。
(b) And detecting the threshold voltage offset of the driving transistor of each row of pixels in a row unit in the OLED display and acquiring the minimum offset voltage.
(c) And selecting an appropriate gamma voltage group to drive the pixels of a certain row according to the minimum offset voltage of the pixels of the certain row so as to at least completely compensate the minimum offset voltage.
Specifically, when a certain row of pixels of which the threshold voltage of the driving transistor is not shifted is detected in the OLED display, selecting the reference gamma voltage group to drive the certain row of pixels; selecting the first gamma voltage group to drive the certain row of pixels when the threshold voltage of the driving transistor is detected to shift in the OLED display and the minimum shift voltage is a forward shift; and when the threshold voltage of the driving transistor is detected to be shifted in the OLED display and the minimum offset voltage is negative offset, selecting the second gamma voltage group to drive the certain row of pixels.
After detecting the threshold voltage offset of the driving transistor and obtaining the minimum offset voltage, the driving method of the OLED display selects an appropriate gamma voltage group to drive the corresponding row of pixels, so that at least the minimum offset voltage can be completely compensated, and other pixels with larger offset can be improved. And proper gamma voltages are respectively selected for different areas (specifically for each row of pixels) to compensate, so that a better compensation effect can be obtained for the whole display area, and the display quality is improved.
In a preferred scheme, an offset threshold value can be set; if the minimum offset voltage of a certain row of pixels is not larger than the offset threshold value, selecting the reference gamma voltage group to drive the certain row of pixels; if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is forward offset, selecting the first gamma voltage group to drive the certain row of pixels; and if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is negative offset, selecting the second gamma voltage group to drive the certain row of pixels. When the OLED display is in a normal state, the reference gamma voltage group is selected to be used for driving, and after the OLED display is used for a long time, the threshold voltage of the driving transistor is generally shifted towards the positive direction or the negative direction in the whole process, and when the offset is small (the offset threshold is not exceeded), the reference gamma voltage group can be selected not to be switched but to be used for driving continuously, so that the driving difficulty is reduced.
Further, when the number of the first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage groupxminAre all less than V0min(ii) a When the number of the second gamma voltage groups is two or more, the reference voltage ranges of the two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max. For example, the number of the first gamma voltage groups is two, wherein the reference voltage range of one first gamma voltage group is Vx1min～Vx1maxThe reference voltage range of another first gamma voltage group is Vx2min～Vx2maxAnd V isx2min<Vx1min<V0minWhen the selected reference voltage range is Vx1min～Vx1maxWhen the first gamma voltage group cannot compensate the minimum offset voltage, the reference voltage range can be selected to be Vx2min～Vx2maxThe first gamma voltage group carries out drive compensation; similarly, the same is true for the relationship of two or more of the second gamma voltage sets.
Further, in a preferred embodiment, in the first gamma voltage group, Vxmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner; in the second gamma voltage group, Vymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence. For example, if V0min-Vxmin＝V1Then V is0max-Vxmax＝V1And V isxminTo VxmaxRelative to V0minTo V0maxRespectively decreases by a constant value V in a one-to-one correspondence with each reference voltage1(ii) a If Vymin-V0min＝V2Then V isymax-V0max＝V2And V isyminTo VymaxRelative to V0minTo V0maxRespectively increases a constant value V in a one-to-one correspondence with each reference voltage2。
The present embodiment also provides an OLED display, wherein the driving method of the present embodiment is adopted. Specifically, as shown in fig. 3, the OLED display includes a display panel 1, a timing controller 2, a source driver 3, a gate driver 4, a gamma voltage generating unit 5, and a threshold voltage detecting unit 6.
The display panel 1 has criss-cross data lines and scanning lines (not shown in the drawings), and has M rows × N columns of pixels (only one of the pixels Px is shown in the drawings by way of example), M, N each being a positive integer.
The timing controller 2 is configured to supply a timing control signal and an image signal to the source driver 3, input a timing control signal to the gate driver 4, and input a voltage selection signal to the gamma voltage generating unit 5.
The source driver 3 generates a data signal according to a timing control signal and an image signal received from the timing controller 2 and a reference voltage received from the gamma voltage generating unit 5, and inputs the data signal into the display panel 1 through a data line to drive the pixel Px in the display panel 1.
The gate driver 4 generates a scan signal according to a timing control signal received from the timing controller 4, and inputs the scan signal into the display panel 1 through a scan line to drive the pixels Px in the display panel 1.
The threshold voltage detection unit 6 is configured to detect a threshold voltage shift amount of a driving transistor of each pixel Px in the display panel 1, and input the detected threshold voltage shift amount to the timing controller 2. The timing controller 2 generates a corresponding voltage selection signal according to the threshold voltage offset received from the threshold voltage detection unit 6 and inputs the voltage selection signal to the gamma voltage generation unit 5.
The gamma voltage generating unit 5 selects and outputs a corresponding gamma voltage group (reference voltage) to the source driver 3 according to a voltage selection signal received from the timing controller 2. Specifically, as shown in fig. 3, the gamma voltage generating unit 5 includes a reference gamma voltage generator 51, at least one first gamma voltage generator 52, and at least one second gamma voltage generator 53. Wherein the reference gamma voltage generator 51 is used for generating the reference voltage range V0min～V0maxThe first gamma voltage generator 52 is used for generating a reference voltage range of Vxmin～VxmaxThe second gamma voltage generator 53 is used for generating a reference voltage range of Vymin～VymaxOf a second gamma voltage group, wherein Vxmin<V0min，Vymax>V0max. The gamma voltage generating unit 5 selects one of the reference gamma voltage group generated by the reference gamma voltage generator 51, the first gamma voltage group generated by the first gamma voltage generator 52, and the second gamma voltage group generated by the second gamma voltage generator 53 to be output to the source driver 3 for driving, according to the voltage selection signal received from the timing controller 2.
More specifically, the timing controller 2 obtains the minimum offset voltage of each row of pixels according to the threshold voltage offset amount detected by the threshold voltage detection unit 6, generates a corresponding voltage selection signal according to the minimum offset voltage of a certain row of pixels, and controls the gamma voltage generation unit 5 to provide an appropriate gamma voltage group to be input to the source driver 3 to drive the certain row of pixels, so as to at least completely compensate the minimum offset voltage.
Specifically, when a certain row of pixels in which the threshold voltage of the driving transistor is not shifted is detected, the timing controller 2 controls the reference gamma voltage generator 51 in the reference gamma voltage generator 5 to input a reference gamma voltage group to the source driver 3, and drives the certain row of pixels. When the threshold voltage of the driving transistor is detected to be shifted and the minimum shift voltage is a forward shift, the timing controller 2 controls the first gamma voltage generator 52 of the first gamma voltage generator 5 to input a first gamma voltage group to the source driver 3 to drive the certain row of pixels. When it is detected that the threshold voltage of the driving transistor is shifted and the minimum shift voltage is a negative shift, the timing controller 2 controls the second gamma voltage generator 53 of the second gamma voltage generator 5 to input a second gamma voltage group to the source driver 3 to drive the certain row of pixels.
Further, an offset threshold is preset in the timing controller 2; if the minimum offset voltage of a certain row of pixels is not greater than the offset threshold, the timing controller 2 controls the reference gamma voltage group generated by the reference gamma voltage generator 51 to be input to the source driver 3 to drive the certain row of pixels; if the minimum offset voltage of a certain row of pixels is greater than the offset threshold and is a forward offset, the timing controller 2 controls the first gamma voltage group generated by the first gamma voltage generator 52 to be input to the source driver 3 to drive the certain row of pixels; if the minimum offset voltage of a certain row of pixels is greater than the offset threshold and is a negative offset, the timing controller 2 controls the second gamma voltage group generated by the second gamma voltage generator 53 to be input to the source driver 3 to drive the certain row of pixels.
Further, in this embodiment, as shown in fig. 3, the number of the first gamma voltage generators 52 is 1, and the number of the second gamma voltage generators 53 is also 1. In some other embodiments, the number of the first gamma voltage generators 52 is two or more, the number of the corresponding generated first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage group isxminAre all less than V0min(ii) a The number of the second gamma voltage generators 53 may also be two or more, and the second gamma voltage groups generated correspondinglyIs two or more, the reference voltage ranges of two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max。
Further, in this embodiment, V is a voltage in the first gamma voltage group generated by the first gamma voltage generator 52xmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner; v of the second gamma voltage group generated by the second gamma voltage generator 53ymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence.
The OLED display and the driving method thereof are provided with a plurality of gamma voltage generators capable of outputting different reference voltage ranges, and after detecting the threshold voltage offset of the driving transistor and acquiring the minimum offset voltage, an appropriate gamma voltage group output by one gamma voltage generator is selected to drive the corresponding row of pixels, so that the minimum offset voltage can be completely compensated, and other pixels with larger offset can be improved. The driving method does not need to carry out frequent write-in operation and access on the gamma voltage generator, can avoid the reaction time required by dynamic setting of binding points in the gamma voltage generator, reduces the driving complexity and is easy to realize; and proper gamma voltages can be selected respectively for different areas (specifically for each row of pixels) to perform compensation, so that a better compensation effect can be obtained for the whole display area, and the display quality is improved.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (8)
1. A method for driving an OLED display, comprising:
providing a reference gamma voltage group, at least one first gamma voltage group and at least one second gamma voltage group, wherein the reference voltage range of the reference gamma voltage group is V0min～V0maxThe reference voltage range of the first gamma voltage group is Vxmin～VxmaxThe reference voltage range of the second gamma voltage group is Vymin～VymaxAnd, Vxmin<V0min，Vymax>V0max；
Detecting the threshold voltage offset of a driving transistor of each row of pixels in a row unit in the OLED display and acquiring the minimum offset voltage;
selecting an appropriate gamma voltage group to drive the pixels of a certain row according to the minimum offset voltage of the pixels of the certain row so as to at least completely compensate the minimum offset voltage; wherein,
when a certain row of pixels of which the threshold voltage of the driving transistor is not shifted is detected in the OLED display, selecting the reference gamma voltage group to drive the certain row of pixels;
selecting the first gamma voltage group to drive the certain row of pixels when the threshold voltage of the driving transistor is detected to shift in the OLED display and the minimum shift voltage is a forward shift;
and when the threshold voltage of the driving transistor is detected to be shifted in the OLED display and the minimum offset voltage is negative offset, selecting the second gamma voltage group to drive the certain row of pixels.
2. The method of driving the OLED display device claimed in claim 1, wherein an offset threshold is set;
if the minimum offset voltage of a certain row of pixels is not larger than the offset threshold value, selecting the reference gamma voltage group to drive the certain row of pixels;
if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is forward offset, selecting the first gamma voltage group to drive the certain row of pixels;
and if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is negative offset, selecting the second gamma voltage group to drive the certain row of pixels.
3. The method of claim 1, wherein the number of the first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage group isxminAre all less than V0min(ii) a The number of the second gamma voltage groups is two or more, the reference voltage ranges of the two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max。
4. The method for driving an OLED display according to any one of claims 1 to 3,
in the first gamma voltage group, Vxmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner;
in the second gamma voltage group, Vymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence.
5. An OLED display, comprising:
a display panel provided with M rows by N columns of pixels, wherein M, N are positive integers;
a threshold voltage detection unit for detecting a threshold voltage shift amount of a drive transistor of each pixel;
a timing controller for inputting a timing control signal and an image signal to the source driver, inputting a timing control signal to the gate driver, and inputting a voltage selection signal to the gamma voltage generating unit;
a gamma voltage generating unit including a reference gamma voltage generator for generating a reference voltage having a range of V, at least one first gamma voltage generator, and at least one second gamma voltage generator0min～V0maxThe first gamma voltage generator is used for generating a reference voltage range of Vxmin～VxmaxThe second gamma voltage generator is used for generating a reference voltage range of Vymin～VymaxOf a second gamma voltage group, wherein Vxmin<V0min，Vymax>V0max；
A source driver receiving a timing control signal and an image signal from the timing controller and a reference voltage from the gamma voltage generating unit, generating a data signal to drive pixels in the display panel;
a gate driver receiving a timing control signal from the timing controller, generating a scan signal to drive pixels in the display panel;
the time sequence controller acquires the minimum offset voltage of each row of pixels according to the threshold voltage offset amount detected by the threshold voltage detection unit, generates a corresponding voltage selection signal according to the minimum offset voltage of a certain row of pixels, and controls the gamma voltage generation unit to provide a proper gamma voltage group to be input to the source driver to drive the certain row of pixels so as to at least completely compensate the minimum offset voltage; wherein,
when a certain row of pixels of which the threshold voltage of the driving transistor is not shifted is detected, the timing controller controls the reference gamma voltage group generated by the reference gamma voltage generator to be input to the source driver to drive the certain row of pixels;
when detecting that the threshold voltage of the driving transistor is shifted and the minimum offset voltage is a forward offset, the timing controller controls a first gamma voltage group generated by the first gamma voltage generator to be input to the source driver to drive the certain row of pixels;
when detecting that the threshold voltage of the driving transistor shifts and the minimum offset voltage is a negative offset, the timing controller controls the second gamma voltage group generated by the second gamma voltage generator to be input to the source driver to drive the certain row of pixels.
6. The OLED display of claim 5, wherein an offset threshold is preset in the timing controller;
if the minimum offset voltage of a certain row of pixels is not larger than the offset threshold value, the timing controller controls a reference gamma voltage group generated by the reference gamma voltage generator to be input to the source driver to drive the certain row of pixels;
if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is in forward offset, the timing controller controls a first gamma voltage group generated by the first gamma voltage generator to be input to the source driver to drive the certain row of pixels;
and if the minimum offset voltage of a certain row of pixels is larger than the offset threshold value and is negative offset, the timing controller controls a second gamma voltage group generated by the second gamma voltage generator to be input to the source driver to drive the certain row of pixels.
7. The OLED display of claim 5, wherein the number of the first gamma voltage generators is two or more, the number of the corresponding generated first gamma voltage groups is two or more, the reference voltage ranges of the two or more first gamma voltage groups are different from each other, and the minimum reference voltage V of each first gamma voltage group isxminAre all less than V0min(ii) a The number of the second gamma voltage generators is two or moreThe number of the correspondingly generated second gamma voltage groups is two or more, the reference voltage ranges of the two or more second gamma voltage groups are different from each other, and the maximum reference voltage V of each second gamma voltage groupxminAre all greater than V0max。
8. The OLED display according to any one of claims 5 to 7,
v in a first gamma voltage group generated by the first gamma voltage generatorxmin<V0min、Vxmax<V0maxAnd V isxminTo VxmaxRelative to V0minTo V0maxRespectively reducing each reference voltage by a fixed value in a one-to-one correspondence manner;
v in a second gamma voltage group generated by the second gamma voltage generatorymin>V0min、Vymax>V0maxAnd V isyminTo VymaxRelative to V0minTo V0maxRespectively, by a constant value in a one-to-one correspondence.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512828A (en) * | 2002-12-27 | 2004-07-14 | Lg.飞利浦Lcd有限公司 | Electroluminescent display device and its driving method |
| CN1821842A (en) * | 2006-03-28 | 2006-08-23 | 友达光电股份有限公司 | Low color cast liquid crystal display and its driving method |
| CN101140736A (en) * | 2006-09-06 | 2008-03-12 | 智宝科技股份有限公司 | Gamma electric voltage producer, source driver and display apparatus |
| KR20080048732A (en) * | 2006-11-29 | 2008-06-03 | 엘지디스플레이 주식회사 | Gamma reference voltage generating circuit |
| KR20150007061A (en) * | 2013-07-10 | 2015-01-20 | 삼성디스플레이 주식회사 | gamma correction circuit for Organic Light Emitting Display Device and gamma correction method method thereof |
| CN105047137A (en) * | 2015-09-09 | 2015-11-11 | 深圳市华星光电技术有限公司 | AMOLED real-time compensation system |
| CN105761678A (en) * | 2014-12-31 | 2016-07-13 | 乐金显示有限公司 | Oled display device |
-
2018
- 2018-10-10 CN CN201811179248.3A patent/CN109036278B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512828A (en) * | 2002-12-27 | 2004-07-14 | Lg.飞利浦Lcd有限公司 | Electroluminescent display device and its driving method |
| CN1821842A (en) * | 2006-03-28 | 2006-08-23 | 友达光电股份有限公司 | Low color cast liquid crystal display and its driving method |
| CN101140736A (en) * | 2006-09-06 | 2008-03-12 | 智宝科技股份有限公司 | Gamma electric voltage producer, source driver and display apparatus |
| KR20080048732A (en) * | 2006-11-29 | 2008-06-03 | 엘지디스플레이 주식회사 | Gamma reference voltage generating circuit |
| KR20150007061A (en) * | 2013-07-10 | 2015-01-20 | 삼성디스플레이 주식회사 | gamma correction circuit for Organic Light Emitting Display Device and gamma correction method method thereof |
| CN105761678A (en) * | 2014-12-31 | 2016-07-13 | 乐金显示有限公司 | Oled display device |
| CN105047137A (en) * | 2015-09-09 | 2015-11-11 | 深圳市华星光电技术有限公司 | AMOLED real-time compensation system |
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|---|---|
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