CN107492336B - Display device driving method and display device - Google Patents
Display device driving method and display device Download PDFInfo
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- CN107492336B CN107492336B CN201710885862.0A CN201710885862A CN107492336B CN 107492336 B CN107492336 B CN 107492336B CN 201710885862 A CN201710885862 A CN 201710885862A CN 107492336 B CN107492336 B CN 107492336B
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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
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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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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of Gas Discharge Display Tubes (AREA)
Abstract
The invention discloses a display device and a driving method thereof. The driving method comprises the steps of cutting each frame of picture into a plurality of subfields with the same time; the light emitting time of each sub-field is adjusted to be at the position of the corresponding sub-field time so that the light emitting time of two adjacent sub-fields is connected to increase the brightness amplitude, thereby eliminating the insufficient charge and the loss of the response time to the brightness.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method of a display device and a display device.
Background
In the scan driving circuit of the conventional display device (as shown in fig. 1), since the driving transistor T2 works in the saturation region for a long Time, the threshold voltage may drift, which causes the brightness unevenness of the display screen of the panel, and affects the display effect, in order to improve the brightness unevenness and improve the display effect of the display panel, a PWM (digital driving) method is proposed, and a tangential method of sub-fields and the like is a commonly used PWM driving method at present, which can suppress the brightness unevenness of the display device, however, in the conventional PWM driving method, since the Time for turning on one row of pixels by the PWM driving scan control chip is only 1/N of the original analog voltage driving, where N is the number of bits, and as the resolution of the panel increases, the on Time of one row of pixels is further compressed, so that the problem of unstable brightness due to insufficient charging exists in the actual display, and meanwhile, the panel has a Response Time (Response Time, RT), if the light emitting time of the subfield with the smallest light emitting duty ratio is less than the response time, the panel starts to discharge without actually reaching the target brightness, the brightness is unstable due to insufficient charging, the longer the light emitting time of the subfield is, the higher the brightness amplitude is, the shorter the light emitting time of the subfield is than the response time, and the discharge starts without ending the response time, so that the brightness amplitude is far lower than the target gray scale brightness.
Disclosure of Invention
The invention mainly solves the technical problem of providing a driving method of a display device and the display device, so as to increase the brightness amplitude and eliminate the insufficient charging and the loss of the brightness in corresponding time.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a driving method of a display device, the driving method including:
dividing each frame into a plurality of subfields with the same time;
the light emitting time of each sub-field is adjusted to be at the position of the corresponding sub-field time so that the light emitting time of two adjacent sub-fields are connected to increase the brightness amplitude.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a display device driven by the driving method of any one of the above display devices.
The invention has the beneficial effects that: different from the prior art, the invention divides each frame of picture into a plurality of subfields with the same time, and adjusts the luminous time of each subfield to be positioned at the position of the corresponding subfield so as to connect the luminous time of two adjacent subfields, thereby increasing the brightness amplitude and eliminating the insufficient charge and the loss of the response time to the brightness.
Drawings
FIG. 1 is a circuit diagram of a conventional scan driving circuit;
fig. 2 is a circuit diagram of a conventional PWM driving type scan driving circuit;
FIG. 3 is a schematic diagram of the PWM driving scheme of FIG. 2;
FIG. 4 is a schematic diagram of an actual luminance variation curve under PWM driving of a conventional display device;
FIG. 5 is a flow chart of a driving method of a display device according to the present invention;
fig. 6 is a schematic structural diagram of a first embodiment of a driving method of a display device of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of a driving method of a display device of the present invention;
fig. 8 is a schematic structural diagram of a display device according to the present invention.
Detailed Description
Fig. 2 is a circuit diagram of a conventional scan driving circuit. Data is a Data driving signal, Gate1 is a charging scan signal, the transistor T1 is controlled to charge the point a, Gate2 is a discharging scan signal, the transistor T3 is controlled to discharge the point a, Vref is a reference voltage and is about zero, two Gamma voltages, namely GM1 (brightest) and GM9 (darkest), are output at the point a, and according to an I-V equation of transistor current and voltage:
Ids,sat＝k*(Vgs-Vth,T2)2＝k*(VA-VB-Vth,T2)2
wherein Ids, sat is the on-current of the transistor T2, k is the intrinsic conductivity factor, Vgs is the gate-source voltage of the transistor T2, Vth is the threshold voltage of the transistor T2, VA is the voltage at point a, VB is the voltage at point B, and the variation △ Vth of the threshold voltage Vth of the transistor is small relative to (VA-VB) variation due to device degradation or non-uniformity, so compared with the analog voltage driving method, the PWM driving method can suppress the problem of luminance non-uniformity.
Fig. 3 is a schematic diagram of a PWM driving method of a conventional scan driving circuit. Wherein, the x-axis is time, and the y-axis is the scanning time of the scanning line. A frame of picture is equally cut into 8 subfields with the same time, such as SF1-SF8, the light emitting time of a pixel in different subfields is different by controlling the charging time and the discharging time, the duty ratios of the light emitting time of the pixel in the 8 subfields are respectively 1:1, 2:1, 4:1, 8:1, 16:1, 32:1, 64:1 and 128:1, so as to generate PWM brightness signals, and the PWM brightness signals can display different gray-scale brightness by combining the time integration principle of human eyes on brightness. Fig. 4 shows an actual luminance variation curve under PWM driving of a CSOT15 inch RGBW AMOLED (1366x768) panel, and it can be seen from fig. 4 that luminance is unstable due to insufficient charging, the longer the light-emitting time of the sub-field is, the higher the luminance amplitude is, the shorter the light-emitting time of the sub-fields SF6, SF7, and SF8 is than the response time, so that the discharge starts before the response time is finished, and the luminance amplitude is much lower than the target gray-scale luminance.
Fig. 5 is a schematic flow chart illustrating a driving method of a display device according to the present invention. The driving method of the display device includes the steps of:
step S1: dividing each frame into a plurality of subfields with the same time; and
step S2: the brightness amplitude is increased by adjusting the light emitting time of each sub-field to be at the position of the corresponding sub-field time so that the light emitting time or the non-light emitting time of two adjacent sub-fields are connected.
The light emitting time of each sub-field (i.e. the white area of each sub-field, wherein the sum of the white area and the black area of each sub-field forms the corresponding sub-field time) is located before or after the corresponding sub-field time, and the sub-fields are sequentially output according to a first sequence or sequentially output according to a second sequence.
Wherein, each subfield is output according to the first sequence in the same frame, the light-emitting time of the adjusting part subfield is positioned in front of the subfield time, and the light-emitting time of the adjusting part subfield is positioned behind the subfield time.
Fig. 6 is a schematic structural diagram of a driving method of a display device according to a first embodiment of the present invention. In the present embodiment, the plurality of subfields includes first to eighth subfields SF1 to SF8, and the first to eighth subfields SF1 to SF8 sequentially output, for example, the output order of 8 subfields is SF1, SF2, SF3, SF4, SF5, SF6, SF7, and SF 8.
Wherein a light emitting time of the first subfield SF1 is the first subfield SF1 time, a light emitting time of the second subfield SF2 precedes the second subfield SF2 time and is connected to a light emitting time of the first subfield SF1, the light emission time of the third subfield SF3 is positioned after the time of the third subfield SF3, the light emitting time of the fourth subfield SF4 precedes the time of the fourth subfield SF4 and is connected to the light emitting time of the third subfield SF3, the light emission time of the fifth subfield SF5 is positioned after the time of the fifth subfield SF5, the light emission time of the sixth subfield SF6 precedes the time of the sixth subfield SF6 and is connected to the light emission time of the fifth subfield SF5, the light emission time of the seventh subfield SF7 is positioned after the time of the seventh subfield SF7, a light emitting time of the eighth subfield SF8 is positioned before the time of the eighth subfield SF8 and is connected to a light emitting time of the seventh subfield SF 7.
In this embodiment, the duty ratio of the light emitting time of each subfield in the same frame is 2 in sequence n-11, wherein n is a positive integer and is less than or equal to the number of sub-fields in each frame of picture. For example, a picture frame is equally divided into 8 temporally identical subfields SF1-SF8, all of which are equal in sizeThe time of charging and discharging is controlled to realize that the light emitting time of the pixel is different in different sub-fields, and the duty ratios of the light emitting time of the pixel (namely the proportion of the light emitting time occupying the corresponding sub-field time) in 8 sub-fields SF1-SF8 are respectively 1:1, 2:1, 4:1, 8:1, 16:1, 32:1, 64:1 and 128:1, so as to generate PWM brightness signals.
The following description will be given taking 8bits driving as an example:
when the subfields SF1-SF8 are sequentially outputted, for example, the output sequence of 8 subfields is SF1, SF2, SF3, SF4, SF5, SF6, SF7 and SF8, wherein the duty ratios of the light emitting time of the pixels of the subfields SF1 to SF8 are sequentially decreased, and the light emitting time of the adjacent subfields can be connected two by adjusting the light emitting time of each subfield to be before or after the corresponding subfield and the light emitting time of the adjacent subfields to be at different positions. In the embodiment, the light emitting time of the sub-fields SF2, SF4, SF6 and SF8 is adjusted to be in front of the corresponding sub-field time, the light emitting time of the sub-fields SF3, SF5 and SF7 is adjusted to be behind the corresponding sub-field time, wherein the sub-field SF1 has no non-light emitting time (namely the sub-field SF1 always emits light and the light emitting duty ratio is 1:1), the adjustment is not needed, the light emitting time of the sub-fields SF1 and SF2 and SF3 and SF4, SF5 and SF6, SF7 and SF8 after the adjustment is connected, if the adjacent sub-fields emit light at the same time, the two response times are reduced to only one response time, the influence of the response time on the brightness can be effectively reduced, the light emitting time superposition can increase the brightness amplitude, and the brightness loss caused by insufficient charging can be effectively reduced.
Fig. 7 is a schematic structural diagram of a driving method of a display device according to a second embodiment of the present invention. The second embodiment of the driving method of the display device is different from the first embodiment described above in that: and outputting each subfield in a second sequence in the same frame, wherein the light emitting time of the adjusting subfield is positioned in front of the subfield time, and the light emitting time of the adjusting subfield is positioned behind the subfield time.
Specifically, the plurality of subfields includes first to eighth subfields SF1-SF8, the first to eighth subfields SF1-SF8 output arbitrarily, for example, the output sequence of 8 subfields is SF1, SF2, SF3, SF8, SF4, SF7, SF5, and SF6, in other embodiments, the output sequence of 8 subfields SF1-SF8 is not limited to the manner of this embodiment, and the sequence of each subfield may be set as needed.
Wherein a light emitting time of the first subfield SF1 is the first subfield SF1 time, a light emitting time of the second subfield SF2 precedes the second subfield SF2 time and is connected to a light emitting time of the first subfield SF1, the light emission time of the third subfield SF3 is positioned after the time of the third subfield SF3, the light emission time of the eighth subfield SF8 precedes the time of the eighth subfield SF8 and is connected to the light emission time of the third subfield SF3, the light emission time of the fourth subfield SF4 is positioned after the time of the fourth subfield SF4, the light emission time of the seventh subfield SF7 precedes the time of the seventh subfield SF7 and is connected to the light emission time of the fourth subfield SF4, the light emission time of the fifth subfield SF5 is positioned after the time of the fifth subfield SF5, the light emission time of the sixth subfield SF6 is positioned before the time of the sixth subfield SF6 and is connected to the light emission time of the fifth subfield SF 5.
The following description will be given taking 8bits driving as an example:
the output sequence of the subfields SF1-SF8 is disturbed, for example, the output sequence of 8 subfields is SF1, SF2, SF3, SF8, SF4, SF7, SF5 and SF6 in sequence, wherein the light emitting time of the subfields SF1 and SF2, the light emitting time of the subfields SF3 and SF8, the light emitting time of the subfields SF4 and SF7, and the light emitting time of the subfields SF5 and SF6 are connected in pairs, so that the light emitting time after the overlapping is relatively even, the influence of the response time is still obvious even if the light emitting time of the subfields SF7 and SF8 is overlapped, and therefore, the light emitting time of the subfields SF7 and SF4 is connected, and the light emitting time of the subfields SF8 and SF3 are connected, so that the influence of the response time on the luminance is effectively reduced, and the light emitting time overlapping can increase the luminance amplitude and effectively reduce the luminance loss caused by insufficient charging.
Fig. 8 is a schematic structural diagram of a display device according to the present invention. The display device is an OLED, the display device is driven by the driving method of the display device, and other devices and functions in the display device are the same as those of the existing display device, so that the details are not repeated.
The driving method of the display device and the display device increase the brightness amplitude by dividing each frame of picture into a plurality of subfields with the same time and adjusting the light-emitting time of each subfield to be positioned in front of or behind the corresponding subfield so as to connect the light-emitting time of two adjacent subfields, thereby eliminating the insufficient charge and the loss of the response time to the brightness.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A driving method of a display device, the driving method comprising:
dividing each frame into a plurality of subfields with the same time;
the brightness amplitude is increased by adjusting the light emitting time of each sub-field to be at the position of the corresponding sub-field time so that the light emitting time or the non-light emitting time of two adjacent sub-fields are connected.
2. The method of driving a display device according to claim 1, wherein the plurality of subfields are sequentially output in a first order or sequentially output in a second order, and a light emitting time of each subfield is located before or after a corresponding subfield time.
3. The method for driving a display device according to claim 2, wherein each subfield is outputted in the first order in the same frame, and the light emission time of the subfield of the adjustment part is positioned before the corresponding subfield time while the light emission time of the subfield of the other adjustment part is positioned after the corresponding subfield time.
4. The method of driving a display device according to claim 3, wherein the plurality of subfields include a first subfield, a second subfield, a third subfield, a fourth subfield, a fifth subfield, a sixth subfield, a seventh subfield, and an eighth subfield, and the first to eighth subfields are sequentially output.
5. The method of driving a display device according to claim 4, wherein a light emitting time of the first subfield is the first subfield time, the light emitting time of the second subfield is positioned before the light emitting time of the second subfield and is connected with the light emitting time of the first subfield, a light emitting time of the third subfield is positioned after a time of the third subfield, a light emitting time of the fourth subfield is positioned before a time of the fourth subfield and is connected with a light emitting time of the third subfield, a light emitting time of the fifth subfield is positioned after the fifth subfield time, a light emitting time of the sixth subfield is positioned before the sixth subfield time and is connected with the light emitting time of the fifth subfield, and the light emitting time of the seventh sub-field is positioned behind the light emitting time of the seventh sub-field, and the light emitting time of the eighth sub-field is positioned in front of the light emitting time of the eighth sub-field and is connected with the light emitting time of the seventh sub-field.
6. The method for driving a display device according to claim 2, wherein each subfield is outputted in the second order in the same frame, and the light emission time of the adjustment subfield is positioned before the subfield time while the light emission time of the adjustment subfield is positioned after the subfield time.
7. The method of driving a display device according to claim 6, wherein the plurality of subfields include a first subfield, a second subfield, a third subfield, a fourth subfield, a fifth subfield, a sixth subfield, a seventh subfield, and an eighth subfield, and the first subfield to the eighth subfield are arbitrarily output.
8. The method of driving a display device according to claim 7, wherein a light emitting time of the first subfield is the first subfield time, the light emitting time of the second subfield is positioned before the light emitting time of the second subfield and is connected with the light emitting time of the first subfield, a light emitting time of the third subfield is positioned after a time of the third subfield, a light emitting time of the eighth subfield is positioned before a time of the eighth subfield and is connected with a light emitting time of the third subfield, a light emitting time of the fourth subfield is positioned after the fourth subfield time, a light emitting time of the seventh subfield is positioned before the seventh subfield time and is connected with the light emitting time of the fourth subfield, and the light-emitting time of the fifth sub-field is positioned behind the time of the fifth sub-field, and the light-emitting time of the sixth sub-field is positioned in front of the time of the sixth sub-field and is connected with the light-emitting time of the fifth sub-field.
9. The method for driving a display device according to claim 1, wherein the duty ratio of the light emission time of each subfield in the same frame is sequentially 2n-11, wherein n is a positive integer and is less than or equal to the number of sub-fields in each frame of picture.
10. A display device characterized in that the display device is driven by a driving method of the display device according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710885862.0A CN107492336B (en) | 2017-09-26 | 2017-09-26 | Display device driving method and display device |
| PCT/CN2017/112445 WO2019061762A1 (en) | 2017-09-26 | 2017-11-23 | Driving method for display device and display device |
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| CN201710885862.0A CN107492336B (en) | 2017-09-26 | 2017-09-26 | Display device driving method and display device |
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| CN107492336A CN107492336A (en) | 2017-12-19 |
| CN107492336B true CN107492336B (en) | 2020-03-10 |
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| CN112017603A (en) * | 2020-09-02 | 2020-12-01 | Tcl华星光电技术有限公司 | Backlight module and driving method thereof |
| CN112785972A (en) * | 2021-03-08 | 2021-05-11 | 深圳市华星光电半导体显示技术有限公司 | Light emitting device driving circuit, backlight module and display panel |
| CN114648939A (en) | 2022-03-23 | 2022-06-21 | Tcl华星光电技术有限公司 | Pixel circuit, backlight module and display panel |
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| US6496165B1 (en) * | 1999-07-01 | 2002-12-17 | Pioneer Corporation | Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period |
| CN1554081A (en) * | 2001-07-09 | 2004-12-08 | 松下电器产业株式会社 | Plasma display panel driving method and plasma display panel driver |
| CN100474372C (en) * | 2003-12-01 | 2009-04-01 | Lg电子株式会社 | Apparatus and method for driving plasma display panel |
| CN105047139A (en) * | 2015-09-22 | 2015-11-11 | 深圳市华星光电技术有限公司 | Digital driving method for OLED display device |
| CN106097967A (en) * | 2016-08-25 | 2016-11-09 | 深圳市华星光电技术有限公司 | A kind of OLED PWM driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104732912B (en) * | 2013-12-19 | 2017-05-03 | 昆山工研院新型平板显示技术中心有限公司 | Data drive method, data driver and AMOLED displayer |
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- 2017-09-26 CN CN201710885862.0A patent/CN107492336B/en active Active
- 2017-11-23 WO PCT/CN2017/112445 patent/WO2019061762A1/en active Application Filing
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| US6496165B1 (en) * | 1999-07-01 | 2002-12-17 | Pioneer Corporation | Driving apparatus for driving a plasma display panel based on power consumed during a non-light emitting period of a unit display period |
| CN1554081A (en) * | 2001-07-09 | 2004-12-08 | 松下电器产业株式会社 | Plasma display panel driving method and plasma display panel driver |
| CN100474372C (en) * | 2003-12-01 | 2009-04-01 | Lg电子株式会社 | Apparatus and method for driving plasma display panel |
| CN105047139A (en) * | 2015-09-22 | 2015-11-11 | 深圳市华星光电技术有限公司 | Digital driving method for OLED display device |
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| CN107492336A (en) | 2017-12-19 |
| WO2019061762A1 (en) | 2019-04-04 |
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