CN108986746B - Driving device and driving method - Google Patents
Driving device and driving method Download PDFInfo
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- CN108986746B CN108986746B CN201810918166.XA CN201810918166A CN108986746B CN 108986746 B CN108986746 B CN 108986746B CN 201810918166 A CN201810918166 A CN 201810918166A CN 108986746 B CN108986746 B CN 108986746B
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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]
- G09G3/3225—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] using an active matrix
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
- Control Of El Displays (AREA)
Abstract
The driving device and the driving method provided by the invention have the advantages that the driving voltage which is used for outputting the periodic change along with the scanning signal is arranged, the time length of the organic light-emitting diode in the light-emitting state is controlled according to the change of the driving voltage, the luminance of the organic light-emitting diode is controlled by using the light-emitting time length to reach the target luminance, so that each organic light-emitting diode can reach the target luminance, and the uniformity of the luminance of a display picture is ensured; the complex compensation circuit is avoided, the complexity of manufacture is simplified, and the cost is saved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving apparatus and a driving method.
Background
With the development of display technology, the display technology of Organic light Emitting Diode (O L ED) is gradually mature, and the advantages of high brightness, full color, high contrast, lower driving voltage, faster response time and the like are obvious.
However, the organic light emitting diode display technology still has more obvious defects. Due to the uneven manufacture of the panel, the threshold voltages of the driving transistors are different, which causes the current difference and the brightness difference among the organic light emitting diodes, and further causes the display difference caused by the uneven brightness among the pixels. Although some compensation techniques address the effects of threshold voltage, they increase the complexity and cost of fabrication and do not address the effects of device aging.
Disclosure of Invention
The invention provides a driving device and a driving method, which can solve the problem of display difference caused by uneven display brightness.
The invention provides a driving device for driving a display module, the display module comprises a plurality of sub-pixels, each sub-pixel comprises an organic light emitting diode, the driving device is characterized in that:
the display driving module is used for driving each organic light emitting diode to be in a light emitting state or a light-off state;
the gray scale conversion module is used for acquiring a gray scale value of each sub-pixel in a current display picture and converting the gray scale value into a corresponding target voltage;
the voltage output module is used for outputting a driving voltage which periodically changes along with the scanning signal;
the voltage comparison module is used for receiving and comparing the target voltage and the driving voltage of each sub-pixel;
the control module is used for controlling the display driving module to drive the organic light emitting diode to be in a light emitting state when the driving voltage does not reach the target voltage; and when the driving voltage reaches the target voltage, controlling the display driving module to drive the organic light emitting diode to be in an off state and continuing until one period of the scanning signal is finished.
In the driving apparatus of the present invention, the time length of the organic light emitting diode in the light emitting state can be calculated according to the following formula:
wherein x is a gray scale value, txThe time length of the organic light emitting diode corresponding to the gray scale in the light emitting state, r is the gamma index, tmaxThe time length of the organic light emitting diode corresponding to the maximum gray scale in the light emitting state.
In the driving device of the present invention, the display driving module includes: a plurality of driving units, each of the driving units including a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor;
the grid electrode of the first transistor is connected with the scanning signal, the source electrode of the first transistor is connected with a reference voltage, and the drain electrode of the first transistor is connected with the grid electrode of the second transistor;
the source of the second transistor is connected with anode voltage, and the drain of the second transistor is connected with the source of the third transistor;
the grid electrode of the third transistor is connected with the drain electrode of the fourth transistor and the drain electrode of the fifth transistor, and the drain electrode of the third transistor is connected with the anode electrode of the organic light-emitting diode;
the grid electrode of the fourth transistor and the grid electrode of the fifth transistor are connected with the control module, the source electrode of the fourth transistor is connected with a first voltage, and the source electrode of the fifth transistor is connected with a second voltage;
and the cathode of the organic light-emitting diode is connected with the cathode voltage.
In the driving device according to the present invention, the first transistor, the second transistor, the third transistor, and the fifth transistor are N-type transistors, and the fourth transistor is a P-type transistor.
In the driving device of the present invention, one cycle of the driving voltage includes one rising edge period and one falling edge period.
In the driving device of the invention, in the rising edge time period, when the driving voltage is less than the target voltage, the control module controls the display driving module to drive the organic light emitting diode to be in a light emitting state.
In the driving device of the present invention, the control module controls the display driving module to drive the organic light emitting diode to be in an off state when the driving voltage is equal to or higher than the target voltage during the rising edge period and during the falling edge period.
In the driving device of the present invention, a period of the driving signal is equal to a period of the scanning signal.
In the driving apparatus of the present invention, the gray scale conversion module converts the obtained gray scale value into a corresponding target voltage according to the following formula:
wherein x is a gray scale value, VxIs a target voltage V corresponding to the gray scalemaxIs a predetermined value.
In the driving device of the present invention, the driving device further includes: an instruction receiving module;
the instruction receiving module is used for receiving an adjusting instruction, and the adjusting instruction is used for changing the VmaxThe value of (c).
The present invention also provides a driving method for driving a display module, the display module including a plurality of sub-pixels, each of the sub-pixels including an organic light emitting diode, the driving method including:
driving each organic light emitting diode to be in a light emitting state and outputting a driving voltage which periodically changes along with a scanning signal;
acquiring a gray-scale value of each sub-pixel in a current display picture, and converting the gray-scale value into a corresponding target voltage;
comparing the target voltage with the driving voltage, and controlling the organic light emitting diode to be in a light emitting state when the driving voltage does not reach the target voltage; and when the driving voltage reaches the target voltage, controlling the organic light emitting diode to be in an off state and continuing until one period of the scanning signal is finished.
In the driving method of the present invention, the time length of the organic light emitting diode in the light emitting state may be calculated according to the following formula:
wherein x is a gray scale value, tx is a duration of the organic light emitting diode corresponding to the gray scale in the light emitting state, r is a gamma index, and tmax is a duration of the organic light emitting diode corresponding to the maximum gray scale in the light emitting state.
The driving device and the driving method provided by the invention have the advantages that the driving voltage which is used for outputting the periodic change along with the scanning signal is arranged, the time length of the organic light-emitting diode in the light-emitting state is controlled according to the change of the driving voltage, the luminance of the organic light-emitting diode is controlled by using the light-emitting time length to reach the target luminance, so that each organic light-emitting diode can reach the target luminance, and the uniformity of the luminance of a display picture is ensured; the complex compensation circuit is avoided, the complexity of manufacture is simplified, and the cost is saved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a driving device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a driving apparatus according to an embodiment of the invention;
FIG. 3 is a timing diagram of signals of a driving apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a driving method according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a driving device according to an embodiment of the present invention. As shown in fig. 1, the driving apparatus 10 is used for driving a display module 20, the display module 20 includes a plurality of sub-pixels 201, and each sub-pixel 201 includes an organic light emitting diode 211. Wherein, this drive arrangement 10 includes: a display driving module 101, a gray scale conversion module 102, a voltage output module 103, a voltage comparison module 104 and a control module 105; the display driving module 101 is configured to drive each of the organic light emitting diodes 211 to be in a light emitting state or a light-off state; the gray scale conversion module 102 is configured to obtain a gray scale value of each sub-pixel 201 on a current display screen, and convert the gray scale value into a corresponding target voltage; the voltage output module 103 is used for outputting a driving voltage which periodically changes along with the scanning signal; the voltage comparison module 104 is configured to receive and compare a target voltage and a driving voltage of each sub-pixel 201; the control module 105 is used for controlling the display driving module 101 to drive the organic light emitting diode 211 to be in a light emitting state when the driving voltage does not reach the target voltage; and when the driving voltage reaches the target voltage, controlling the display driving module 101 to drive the organic light emitting diode 211 to be in an off state and continuing until one period of the scanning signal is finished.
Thus, the display driving module 101 of the driving apparatus 10 drives the organic light emitting diode 211 of each sub-pixel 201 to operate so as to achieve the target brightness, and controls the duration of the organic light emitting diode 211 in the light emitting state according to the variation of the driving voltage by setting a driving voltage that varies periodically with the scanning signal, and controls the brightness of the organic light emitting diode 211 by using the light emitting duration so as to achieve the target brightness, so that each organic light emitting diode 211 can achieve the target brightness, and the uniformity of the brightness of the display image is ensured; meanwhile, a complex compensation circuit is avoided, the complexity of manufacturing is simplified, and further the cost is saved.
Specifically, the light emitting duration of the organic light emitting diode 211 can be calculated according to the following formula:
wherein x is a gray scale value, txThe time length of the organic light emitting diode corresponding to the gray scale in the light emitting state, r is the gamma index, tmaxThe time length of the organic light emitting diode corresponding to the maximum gray scale in the light emitting state.
In some embodiments, the gray scale conversion module 102 may convert the obtained gray scale value into a corresponding target voltage according to the following formula:
wherein x is a gray scale value, VxIs a target voltage V corresponding to the gray scalemaxIs a predetermined value.
Can be changed by changing VmaxTo adjust the overall brightness of the display module 20. The driving device further includes: instruction receiving moduleThe instruction receiving module is used for receiving an adjusting instruction, and the adjusting instruction is used for changing the VmaxThe value of (c). For example: the brightness adjusting instruction can be automatically sent out by a control module or other controllers according to the actual display requirement; the brightness adjustment instruction may also be manually issued by the user. For example, the user may issue the adjustment instruction by operating a physical key or operating a touch screen.
Referring to fig. 2, fig. 2 is a circuit diagram of a driving device according to an embodiment of the invention. As shown in fig. 1 and 2, the display driving module 101 includes: a plurality of driving units 111, each driving unit 111 including a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, and a fifth transistor T5;
the gate of the first transistor T1 is connected to the SCAN signal SCAN, the source of the first transistor T1 is connected to the reference voltage Vref, the drain of the first transistor T1 is connected to the gate of the second transistor T2, the source of the second transistor T2 is connected to the anode voltage E L VDD, the drain of the second transistor T2 is connected to the source of the third transistor T3, the gate of the third transistor T3 is connected to the drain of the fourth transistor T4 and the drain of the fifth transistor T5, the drain of the third transistor T3 is connected to the anode of the organic light emitting diode 211, the gate of the fourth transistor T4 and the gate of the fifth transistor T5 are connected to the control module 105, the source of the fourth transistor T4 is connected to the first voltage VGH, the source of the fifth transistor T5 is connected to the second voltage VG L, and the cathode of the organic light emitting diode 211 is connected to the voltage E L VSS.
The first transistor T1, the second transistor T2, the third transistor T3, and the fifth transistor T5 are N-type transistors, and the fourth transistor T4 is a P-type transistor.
Referring to fig. 3, fig. 3 is a timing diagram of signals of a driving apparatus according to an embodiment of the invention. In combination with the description of the embodiment 1, fig. 2, and fig. 3, the SCAN signal SCAN is a periodically varying square wave; the driving voltage Vcharge is a triangular wave periodically varying with the SCAN signal SCAN.
Wherein, the period of the driving voltage Vcharge is equal to the period of the SCAN signal SCAN. Specifically, one cycle of the driving voltage Vcharge includes one rising edge period and one falling edge period. In the rising edge period, when the driving voltage Vcharge is smaller than the target voltage Vdata, the control module 105 controls the display driving module 101 to drive the organic light emitting diode 211 to be in a light emitting state. During the rising edge period, when the driving voltage Vcharge is greater than or equal to the target voltage Vdata, and during the falling edge period, the control module 105 controls the display driving module 101 to drive the organic light emitting diode 211 in the off state.
The operation of the driving apparatus will be described in detail below.
At time T1, the SCAN signal SCAN is high, the first transistor T1 is turned on, and the reference signal Vref is output to the gate of the second transistor T2 through the first transistor T1; the control signal Vcon output by the control module 105 is at a low level, the fourth transistor T4 is turned on, the fifth transistor T5 is turned off, and the first voltage VGH is output to the gate of the third transistor T3 through the fourth transistor T4; the second transistor T2 is turned on under the control of the reference signal Vref, and the third transistor T3 is turned on under the control of the first signal VGH, thereby driving the organic light emitting diode 211 to be in a light emitting state.
Meanwhile, at the time t1, the gray scale conversion module 102 obtains the gray scale value of each sub-pixel 201 on the current display screen, and converts the gray scale value into the corresponding target voltage Vdata; the voltage output module 103 outputs a driving voltage Vcharge which periodically changes with the SCAN signal SCAN; the voltage comparison module 104 receives and compares the target voltage Vdata of each sub-pixel 211 with the driving voltage Vcharge; when the driving voltage Vcharge does not reach the target voltage Vdata, the control signal Vcon output by the control module 105 is still at a low level, and the organic light emitting diode 211 is continuously in a light emitting state.
At time T2, the driving voltage Vcharge reaches the target voltage Vdata, the control signal Vcon output by the control module 105 is at a high level and continues until one period of the SCAN signal SCAN is finished, the fourth transistor T4 is turned off, the fifth transistor T5 is turned on, the second voltage VG L is output to the gate of the third transistor T3 through the fifth transistor T5, the third transistor T3 is turned off under the control of the second voltage VG L, and the organic light emitting diode 211 is driven to be in an off state and continues until one period of the SCAN signal SCAN is finished.
It should be noted that D1, D2, D3 and D4 shown in fig. 3 are different target voltages Vdata corresponding to different gray-scale values; only the target voltage Vdata corresponding to one gray scale value is described above, and those skilled in the art can obtain the processing procedures of other gray scale values according to the above description, which is not described herein again.
The driving device of the embodiment of the invention controls the time length of the organic light emitting diode in a light emitting state by setting the driving voltage which is used for outputting the periodic change along with the scanning signal and according to the change of the driving voltage, and controls the brightness of the organic light emitting diode by using the light emitting time length to enable the brightness of the organic light emitting diode to reach the target brightness, so that each organic light emitting diode can reach the target brightness, and the uniformity of the brightness of a display picture is ensured; the complex compensation circuit is avoided, the complexity of manufacture is simplified, and the cost is saved.
Referring to fig. 4, fig. 4 is a flowchart illustrating a driving method according to an embodiment of the invention. As shown in fig. 4, the driving method can be applied to the aforementioned driving apparatus for driving a display module, where the display module includes a plurality of sub-pixels, and each of the sub-pixels includes an organic light emitting diode. The driving method includes:
Specifically, the light emitting duration of the organic light emitting diode can be calculated according to the following formula:
wherein x is a gray scale value, txThe time length of the organic light emitting diode corresponding to the gray scale in the light emitting state, r is the gamma index, tmaxThe time length of the organic light emitting diode corresponding to the maximum gray scale in the light emitting state.
The driving device and the driving method provided by the embodiment of the invention have been described above by applying specific examples to explain the principle and the embodiment of the invention, and the description of the above embodiments is only used to help understanding the invention. Meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A driving apparatus for driving a display module, the display module including a plurality of sub-pixels, each of the sub-pixels including an organic light emitting diode, the driving apparatus comprising:
the display driving module is used for driving each organic light emitting diode to be in a light emitting state or a light-off state;
the gray scale conversion module is used for acquiring a gray scale value of each sub-pixel in a current display picture and converting the gray scale value into a corresponding target voltage;
the voltage output module is used for outputting a driving voltage which periodically changes along with the scanning signal;
the voltage comparison module is used for receiving and comparing the target voltage and the driving voltage of each sub-pixel;
the control module is used for controlling the display driving module to drive the organic light emitting diode to be in a light emitting state when the driving voltage does not reach the target voltage; when the driving voltage reaches the target voltage, controlling the display driving module to drive the organic light emitting diode to be in an off state and continuing until one period of the scanning signal is finished;
the display driving module includes: a plurality of driving units, each of the driving units including a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor;
the grid electrode of the first transistor is connected with the scanning signal, the source electrode of the first transistor is connected with a reference voltage, and the drain electrode of the first transistor is connected with the grid electrode of the second transistor;
the source of the second transistor is connected with anode voltage, and the drain of the second transistor is connected with the source of the third transistor;
the grid electrode of the third transistor is connected with the drain electrode of the fourth transistor and the drain electrode of the fifth transistor, and the drain electrode of the third transistor is connected with the anode electrode of the organic light-emitting diode;
the grid electrode of the fourth transistor and the grid electrode of the fifth transistor are connected with the control module, the source electrode of the fourth transistor is connected with a first voltage, and the source electrode of the fifth transistor is connected with a second voltage;
and the cathode of the organic light-emitting diode is connected with the cathode voltage.
2. The driving apparatus according to claim 1, wherein the time period of the organic light emitting diode in the light emitting state is calculated according to the following formula:
wherein x is a gray scale value, txThe time length of the organic light emitting diode corresponding to the gray scale in the light emitting state, gamma is the gamma index, and t ismaxThe time length of the organic light emitting diode corresponding to the maximum gray scale in the light emitting state.
3. The driving device according to claim 1, wherein the first transistor, the second transistor, the third transistor, and the fifth transistor are N-type transistors, and the fourth transistor is a P-type transistor.
4. The driving apparatus according to claim 1, wherein one cycle of the driving voltage includes one rising edge period and one falling edge period.
5. The driving apparatus according to claim 4, wherein the control module controls the display driving module to drive the organic light emitting diode to be in a light emitting state when the driving voltage is less than the target voltage during the rising edge period.
6. The driving apparatus according to claim 4, wherein the control module controls the display driving module to drive the organic light emitting diode in an off state during the rising edge period when the driving voltage is equal to or greater than the target voltage and during the falling edge period.
7. The driving apparatus according to claim 4, wherein a period of the driving voltage is equal to a period of the scan signal.
8. The driving apparatus as claimed in claim 1, wherein the gray scale conversion module converts the obtained gray scale values into corresponding target voltages according to the following formula:
wherein x is a gray scale value, VxIs a target voltage V corresponding to the gray scalemaxIs a predetermined value.
9. The drive of claim 8, further comprising: an instruction receiving module;
the instruction receiving module is used for receiving an adjusting instruction, and the adjusting instruction is used for changing the Vmax value.
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| CN201810918166.XA CN108986746B (en) | 2018-08-13 | 2018-08-13 | Driving device and driving method |
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| US4554539A (en) * | 1982-11-08 | 1985-11-19 | Rockwell International Corporation | Driver circuit for an electroluminescent matrix-addressed display |
| CN100357999C (en) * | 2003-04-24 | 2007-12-26 | 友达光电股份有限公司 | Circuit for driving organic light emitting diode |
| CN1755778A (en) * | 2004-09-30 | 2006-04-05 | 精工爱普生株式会社 | Pixel circuit, method of driving pixel, and electronic apparatus |
| JP2006098941A (en) * | 2004-09-30 | 2006-04-13 | Sanyo Electric Co Ltd | Display device |
| CN107680531B (en) * | 2017-11-14 | 2019-12-03 | 武汉华星光电半导体显示技术有限公司 | OLED drives compensation circuit and AMOLED display panel |
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