CN106531105B - Display panel driving method and display panel - Google Patents
Display panel driving method and display panel Download PDFInfo
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- CN106531105B CN106531105B CN201611220846.1A CN201611220846A CN106531105B CN 106531105 B CN106531105 B CN 106531105B CN 201611220846 A CN201611220846 A CN 201611220846A CN 106531105 B CN106531105 B CN 106531105B
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000007704 transition Effects 0.000 claims abstract description 35
- 230000008569 process Effects 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000002238 attenuated effect Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
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- 230000003247 decreasing effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a driving method of a display panel and the display panel, wherein one frame of picture time is divided into a picture charging time period, a transition time period and a picture holding time period in sequence. In the picture charging time period, the pixels are charged once at a first preset refresh frequency according to the received frame image data to be displayed. Charging the pixel N times at a second preset refresh frequency in the transition time period; and controlling the picture on the display panel to be in a holding state in the picture holding time period. Since the picture holding period is set in one frame of the picture time, the power consumption of the display panel can be significantly reduced. And because the transition time period is increased, the pixels are charged for N times in the transition time period, so that the problem of pixel voltage attenuation existing in the process of switching the picture from charging to maintaining can be solved. In addition, increasing the transition period may also reduce the voltage drop variation of the pixels during the picture-holding period.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method of a display panel and a display panel.
Background
The liquid crystal display generally includes upper and lower substrates, a liquid crystal layer between the upper and lower substrates, and pixel and common electrodes for generating an electric field at both sides of the liquid crystal layer, an upper polarizer at an outer side of the upper substrate, a lower polarizer at an outer side of the lower substrate, and a backlight.
At present, along with the development of social economy, people have stronger energy-saving and environment-friendly awareness, and the power consumption also becomes an aspect for measuring the performance of the display. Therefore, how to reduce the power consumption of the lcd is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Embodiments of the present invention provide a driving method of a display panel and a display panel, so as to reduce power consumption of the display panel.
The embodiment of the invention provides a driving method of a display panel,
dividing one frame of picture time into a picture charging time period, a transition time period and a picture holding time period in sequence; wherein,
in the picture charging time period, charging pixels on the display panel once at a first preset refresh frequency according to received frame image data to be displayed;
charging the pixels on the display panel for N times at a second preset refresh frequency in the transition time period, wherein N is an integer greater than 1;
and controlling the picture on the display panel to be in a holding state in the picture holding time period.
Correspondingly, the embodiment of the invention also provides a display panel, and the display panel is driven by adopting the driving method provided by the embodiment of the invention.
The invention has the following beneficial effects:
according to the driving method of the display panel and the display panel provided by the embodiment of the invention, one frame of picture time is sequentially divided into the picture charging time period, the transition time period and the picture holding time period. In the picture charging time period, pixels on the display panel are charged once at a first preset refresh frequency according to received frame image data to be displayed, namely, information to be displayed in the whole picture is written. Charging the pixels on the display panel for N times at a second preset refresh frequency in a transition time period; and controlling the picture on the display panel to be in a holding state in the picture holding time period. Since the picture holding period is set in one frame of the picture time, the power consumption of the display panel can be significantly reduced. And, because the transition time interval is added between the picture charging time interval and the picture keeping time interval, the pixels are charged for N times in the transition time interval, thereby solving the problem of pixel voltage attenuation existing in the process of picture switching from charging to keeping. In addition, increasing the transition period may also reduce the voltage drop variation of the pixels during the picture-holding period. Finally, the problems of picture flicker, poor picture quality and the like caused by picture brightness change due to pixel voltage attenuation are solved.
Drawings
FIG. 1 is a timing diagram illustrating a conventional driving method;
fig. 2 is a relationship between a pixel voltage and a gate line voltage, a data line voltage and a common voltage during one frame time under the driving method of fig. 1;
fig. 3 is a flowchart of a driving method according to an embodiment of the present invention;
fig. 4 is a timing diagram illustrating a driving method according to an embodiment of the invention;
fig. 5 is a graph of simulation results of voltage drop changes of pixels when an interval time from the last charge completion to the start of the next frame within a frame time is 0.1s according to an embodiment of the present invention;
fig. 6 is a graph of simulation results of voltage drop changes of pixels when an interval time from the last charge completion to the start of the next frame within a frame time is 0.2s according to an embodiment of the present invention;
fig. 7 is a graph of simulation results of voltage drop changes of pixels when an interval time from the last charge completion to the start of the next frame within a frame time is 0.5s according to an embodiment of the present invention;
fig. 8 is a graph of a simulation result of a change in voltage drop of a pixel when an interval time from the last charge completion to the start of the next frame within a frame time is 1s according to an embodiment of the present invention;
FIG. 9 is a timing diagram illustrating another driving method according to an embodiment of the present invention;
fig. 10 is a timing diagram illustrating another driving method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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 order to reduce the power consumption of the display panel, the frame rate of the driving may be reduced, for example, from the normal frame rate of 60HZ to 20 HZ. For example, a low-frequency intermittent driving method as shown in fig. 1 is adopted, fig. 1 is a timing diagram of a conventional driving method, the driving method mainly divides each frame of picture time d into a picture charging time period and a picture maintaining time period, and information to be displayed in the whole picture is written in the picture charging time period; in the picture holding time period, the grid driver and the source driver both output direct current signals until the next frame of picture starts to be displayed, so that the purpose of reducing the power consumption of the display panel is achieved in the mode.
As shown in fig. 1, a frame time d is 1/S, and S is the required product frequency; the picture charging time c is 1/K, and K is generally set at 60 HZ; (ii) a The picture holding time e is d-c; for one grid line Gn, if the resolution of the display screen is M × N, the on time a of the grid line Gn (N is 1, 2, 3, … N) is 1/N/K, the holding time is equal to d-a, for example, S is 1HZ, and the holding time of the grid line G1 is almost 60 × N times its charging time. In practical applications, due to the influence of parasitic capacitance and leakage current, the relationship between the pixel voltage Vpixel and the gate line voltage Vgate, the data line voltage Vsource and the common voltage Vcom in a frame time is as shown in fig. 2, fig. 2 is the relationship between the pixel voltage Vpixel and the gate line voltage, the data line voltage and the common voltage in a frame time under the driving method in fig. 1, wherein the pixel voltage Vpixel is continuously reduced along with the time during which the pixel is maintained; in addition, for the liquid crystal display device, the response time of liquid crystal is generally 20ms when the liquid crystal display device works at normal temperature, the response time of the liquid crystal display device works at low temperature is generally 40ms, and when the picture charging time is more than 60Hz, the pixel has the influence of insufficient charging; therefore, although the low-frequency intermittent driving method shown in fig. 1 can reduce power consumption, there are problems that the image flicker and the image quality are not good due to the change of the image brightness during the transition from the charging to the holding and during the holding period of the image.
In view of the above, an embodiment of the invention provides a driving method of a display panel, as shown in fig. 3 and fig. 4, wherein fig. 3 is a flowchart of the method, and fig. 4 is a timing diagram; dividing one frame of picture time into a picture charging time period A, a transition time period B and a picture holding time period C in sequence; wherein,
s301, in the picture charging time period A, charging pixels on the display panel once at a first preset refresh frequency according to received frame image data to be displayed;
s302, charging the pixels on the display panel for N times at a second preset refresh frequency in a transition time period B, wherein N is an integer greater than 1; (in FIG. 4, the example is given by N-3.)
And S303, controlling the picture on the display panel to be in a holding state in the picture holding time period C.
In fig. 4, Gn (N is 1, 2, and 3 … N) represents a voltage on a gate line corresponding to an N-th row of pixels on the display panel, Source is a data voltage signal corresponding to the pixel, and when Gn is a high potential, Source charges the corresponding pixel.
In the driving method provided by the embodiment of the invention, one frame of picture time is sequentially divided into the picture charging time period, the transition time period and the picture holding time period. In the picture charging time period, pixels on the display panel are charged once at a first preset refresh frequency according to received frame image data to be displayed, namely, information to be displayed in the whole picture is written. Charging the pixels on the display panel for N times at a second preset refresh frequency in a transition time period; and controlling the picture on the display panel to be in a holding state in the picture holding time period. Since the picture holding period is set in one frame of the picture time, the power consumption of the display panel can be significantly reduced. And, because the transition time period is added between the picture charging time period and the picture keeping time period, the pixels are charged for N times in the transition time period, thereby solving the problem of pixel voltage attenuation existing in the process of picture switching from charging to keeping in the driving method of fig. 1. In addition, increasing the transition period may also reduce the voltage drop variation of the pixels during the picture-holding period. Finally, the problems of picture flicker, poor picture quality and the like caused by picture brightness change due to pixel voltage attenuation are solved.
In specific implementation, in the driving method provided by the embodiment of the invention, the more the charging times in the transition time period, the better the effect. Therefore, in the above driving method provided by the embodiment of the present invention, N is greater than or equal to 3. But a large number of times of charging means that power consumption increases, and therefore, it is preferable that N be equal to 3.
In the driving method provided by the embodiment of the present invention, the duration of the transition time period is N/K seconds, where K is a second preset refresh frequency. That is, the duration of the transition time period is a time length of continuously charging the pixels on the display panel for N times at the second preset refresh frequency.
In a specific implementation, in the driving method provided in the embodiment of the present invention, the second preset refresh frequency is the same as the first preset refresh frequency. This is because the more refresh frequencies that are used when charging the pixels of the display panel, the more complex drivers are required.
Further, in the above driving method according to the embodiment of the present invention, in the transition period, the data voltage at each pixel when the pixel on the display panel is charged is equal to the data voltage when the pixel is charged in the screen charging period. This is because, when displaying a frame of picture, ideally, the voltage of each pixel is required to be fixed, but in practical applications, the voltage of a pixel decreases with time while it is held, and therefore, in the transition period, the data voltage of each pixel when charging the pixel on the display panel is equal to the data voltage when charging the pixel in the picture charging period.
The voltage drop change of the pixels under different interval time conditions from the last charging completion to the next frame within one frame time is simulated through simulation experiments. Taking the pixel voltage at the time of the last charging as an example of 10V, when the interval time is 0.1s, the simulation result is shown in fig. 5, and the voltage of the pixel is attenuated to 8.1068V; when the interval time is 0.2s, the simulation result is as shown in fig. 6, and the voltage of the pixel is attenuated to 6.7384V; when the interval time is 0.5s, the simulation result is as shown in fig. 7, and the voltage of the pixel is attenuated to 4.397V; when the interval time is 1s, the simulation result is as shown in fig. 8, and the voltage of the pixel decays to 3.1462V. From the simulation result, it can be obtained that the longer the interval time from the last charging completion to the next frame in one frame of picture time, the larger the voltage drop of the pixel, i.e. the larger the brightness change of the picture. In fig. 5 to 8, the abscissa represents the interval time s, and the ordinate represents the voltage V of the pixel.
Therefore, in the above driving method provided by the embodiment of the present invention, in order to reduce the voltage drop variation of the pixels in the picture holding period, as shown in fig. 9 and 10, the above driving method further includes: in the frame holding time period C, the pixels of the display panel are charged at least once at a third preset refresh frequency, where fig. 9 illustrates at least one time, and fig. 10 illustrates two times of charging.
In specific implementation, in the above driving method provided by the embodiment of the present invention, the more the number of times the pixels of the display panel are charged in the picture holding period, the smaller the voltage drop variation of the pixels in the picture holding period is, the better the display picture quality is, but the larger the power consumption is. Therefore, the number of charging times in the picture holding period can be designed in consideration of the duration of the picture holding period of the pixel, the attenuation of the pixel voltage, and the power consumption in practical use.
Further, for convenience of implementation, in the foregoing driving method provided in the embodiment of the present invention, the third preset refresh frequency is the same as the first preset refresh frequency.
In a specific implementation, in the above driving method provided by the embodiment of the present invention, in the picture holding period, the data voltage of each pixel when the pixel on the display panel is charged is equal to the data voltage when the pixel is charged in the picture charging period.
In a specific implementation, in the frame holding period, the voltage across the pixel is not decreased to the minimum at a time, but is gradually decreased with time, so that after the transition period is over, a certain time is required until the voltage of the pixel is attenuated to a level that can be perceived by human eyes. Therefore, in the above-described driving method provided by the embodiment of the present invention, as shown in fig. 9 and 10, the pixels of the display panel are charged at least once at the third preset refresh frequency in the middle period of the screen holding period C.
Further, in the above driving method according to the embodiment of the present invention, as shown in fig. 10, in the frame holding time period C, the pixels of the display panel are charged a plurality of times at the third preset refresh frequency, and a preset time is spaced between two adjacent charges at the third preset refresh frequency.
In the driving method provided by the embodiment of the present invention, charging a pixel refers to the pixel receiving a data voltage signal and charging the pixel under the control of a gate-on signal. The gate-on signal is typically supplied to the pixel through the gate line by the gate driving circuit, and the data voltage signal is typically supplied to the pixel through the data line by the data signal driving circuit. Therefore, charging the pixels on the display panel 1 time at a certain preset refresh frequency means: the grid driving circuit provides grid opening signals to the pixels in each row in sequence, and the data signal driving circuit provides data voltages to the corresponding pixels when the pixels in the corresponding row receive the grid opening signals.
Further, in practical implementation, in the above driving method provided in an embodiment of the present invention, in the picture holding time period, controlling the picture on the display panel to be in the holding state specifically includes:
controlling a data signal driving circuit of the display panel to output a direct current signal in a picture holding time period; and controlling a grid driving circuit of the display panel to output a grid closing signal so as to disconnect each pixel from the data signal driving circuit.
In practical applications, in the above driving method provided by the embodiment of the present invention, the frame rate of the frame refresh of the display panel is 0.5Hz to 45Hz, i.e. the frame time is 1/45 (seconds) to 1/0.5 (seconds).
In practical applications, in the above driving method provided by the embodiment of the present invention, the first preset refresh frequency is 60Hz to 70Hz, which is not limited herein.
Based on the same inventive concept, the embodiment of the present invention further provides a display panel, and the display panel is driven by any one of the driving methods provided by the embodiment of the present invention. Since the principle of the display panel to solve the problem is similar to the driving method, the implementation of the display panel can refer to the implementation of the driving method, and repeated descriptions are omitted.
According to the driving method of the display panel and the display panel provided by the embodiment of the invention, one frame of picture time is sequentially divided into the picture charging time period, the transition time period and the picture holding time period. In the picture charging time period, pixels on the display panel are charged once at a first preset refresh frequency according to received frame image data to be displayed, namely, information to be displayed in the whole picture is written. Charging the pixels on the display panel for N times at a second preset refresh frequency in a transition time period; and controlling the picture on the display panel to be in a holding state in the picture holding time period. Since the picture holding period is set in one frame of the picture time, the power consumption of the display panel can be significantly reduced. And, because the transition time interval is added between the picture charging time interval and the picture keeping time interval, the pixels are charged for N times in the transition time interval, thereby solving the problem of pixel voltage attenuation existing in the process of picture switching from charging to keeping. In addition, increasing the transition period may also reduce the voltage drop variation of the pixels during the picture-holding period. Finally, the problems of picture flicker, poor picture quality and the like caused by picture brightness change due to pixel voltage attenuation are solved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A driving method of a display panel is characterized in that,
dividing one frame of picture time into a picture charging time period, a transition time period and a picture holding time period in sequence; wherein,
in the picture charging time period, charging pixels on the display panel once at a first preset refresh frequency according to received frame image data to be displayed;
charging the pixels on the display panel for N times at a second preset refresh frequency in the transition time period, wherein N is an integer greater than 1; wherein the second preset refresh frequency is the same as the first preset refresh frequency;
controlling the picture on the display panel to be in a holding state in the picture holding time period, and charging pixels of the display panel at least once at a third preset refresh frequency; wherein the third preset refresh frequency is the same as the first preset refresh frequency.
2. The driving method according to claim 1, wherein N is greater than or equal to 3.
3. The driving method according to claim 2, wherein the duration of the transition period is N/K seconds, where K is a second preset refresh frequency.
4. The driving method according to claim 3, wherein in the transition period, a data voltage at each pixel when a pixel on the display panel is charged is equal to a data voltage when the pixel is charged in the picture charging period.
5. The driving method according to claim 1, wherein in the picture holding period, a data voltage at each pixel when a pixel on the display panel is charged is equal to a data voltage when the pixel is charged in the picture charging period.
6. The driving method according to claim 1, wherein the pixels of the display panel are charged at least once at a third preset refresh frequency in an intermediate period of the picture holding period.
7. The driving method according to claim 1, wherein the pixels of the display panel are charged a plurality of times at a third preset refresh frequency within the picture-holding period, and a preset time is spaced between two adjacent charges charged at the third preset refresh frequency.
8. The driving method according to any one of claims 1 to 4, wherein controlling the picture on the display panel to be in the hold state during the picture hold period is specifically:
controlling a data signal driving circuit of the display panel to output a direct current signal in the picture holding time period; and controlling a grid driving circuit of the display panel to output a grid closing signal so as to disconnect each pixel from the data signal driving circuit.
9. The driving method according to any one of claims 1 to 4, wherein a frame frequency of the picture refresh of the display panel is 0.5Hz to 45 Hz.
10. The driving method according to any one of claims 1 to 4, wherein the first preset refresh frequency is 60Hz to 70 Hz.
11. A display panel driven by the driving method according to any one of claims 1 to 10.
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| CN113760412B (en) * | 2020-06-01 | 2024-07-09 | Oppo（重庆）智能科技有限公司 | Method and device for refreshing display elements on dial interface, watch and computer readable storage medium |
| US11568823B2 (en) | 2020-08-11 | 2023-01-31 | Everdisplay Optronics (Shanghai) Co., Ltd | Driving method of display panel and display device |
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| JP7123097B2 (en) * | 2020-08-20 | 2022-08-22 | シャープ株式会社 | Display device |
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