CN114283735A - Display device and driving method thereof - Google Patents
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- CN114283735A CN114283735A CN202210128164.7A CN202210128164A CN114283735A CN 114283735 A CN114283735 A CN 114283735A CN 202210128164 A CN202210128164 A CN 202210128164A CN 114283735 A CN114283735 A CN 114283735A
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Abstract
A display device and a driving method thereof are provided. The driving method comprises the following steps: distinguishing one image frame period into a plurality of sub-image frame periods; sequentially receiving a plurality of display data and judging the change state of two adjacent display data; writing each display data into a plurality of pixels of the display panel in at least one first sub-picture frame period of the sub-picture frame periods, and stopping the writing of the pixels in a plurality of second sub-picture frame periods of the sub-picture frame periods; and adjusting a first number of cycles of the first sub-picture frame according to the change state, wherein the first number of cycles of the first sub-picture frame is not greater than a second number of cycles of the second sub-picture frame.
Description
Technical Field
The present invention relates to a display device and a driving method thereof, and more particularly, to a display device and a driving method thereof capable of avoiding image persistence (image persistence) at a low image update frequency.
Background
With the development of electronic technology, it is an important issue to provide a high-quality display device in the current electronic products.
In the current technology, when the display device operates at an extremely low image update frequency, an image persistence (image persistence) phenomenon may occur in the display image displayed on the display panel when the display data is changed. This image persistence phenomenon causes the display image after updating to remain as the display image in the previous image data. And the residual image may be eliminated after being maintained for tens of seconds, which seriously affects the display quality.
Disclosure of Invention
The invention provides a display device and a driving method thereof, which can avoid the phenomenon of image persistence.
The driving method of the display device of the invention comprises the following steps: distinguishing one image frame period into a plurality of sub-image frame periods; sequentially receiving a plurality of display data and judging the change state of two adjacent display data; writing each display data into a plurality of pixels of the display panel in a plurality of first sub-picture frame periods of the sub-picture frame periods, and stopping the writing of the pixels in a plurality of second sub-picture frame periods of the sub-picture frame periods; and adjusting a first number of cycles of the first sub-picture frame according to the change state, wherein the first number of cycles of the first sub-picture frame is not greater than a second number of cycles of the second sub-picture frame.
The display device comprises a display panel, a driving circuit and a time schedule controller. The driving circuit is used for driving the display panel. The time schedule controller is coupled with the driving circuit. The time schedule controller is used for: distinguishing the image frame period into a plurality of sub-image frame periods; sequentially receiving a plurality of display data and judging the change state of two adjacent display data; in a plurality of first sub-image frame periods in the sub-image frame periods, writing the display data into a plurality of pixels of the display panel through the driving circuit, and stopping the writing of the pixels in a plurality of second sub-image frame periods in the sub-image frame periods; and adjusting a first number of cycles of the first sub-picture frame according to the change state, wherein the first number of cycles of the first sub-picture frame is not greater than a second number of cycles of the second sub-picture frame.
In view of the above, the display device of the present invention determines a plurality of sequentially received display data when operating at a low image update frequency, and performs a writing operation of the display data on a pixel in a plurality of first sub-image frame periods in one image frame period and stops the writing operation of the pixel in a plurality of second sub-image frame periods when two adjacent display data have a difference. Therefore, when the display data is changed, the writing action of the display data is carried out on the pixels for multiple times through multiple first sub-image frame periods, so that the charging and discharging actions of the pixels can be effectively finished, and the possibility of image persistence is effectively reduced.
Drawings
Fig. 1 is a flowchart illustrating a driving method of a display device according to an embodiment of the invention.
Fig. 2 is a schematic view of a display device according to an embodiment of the invention.
Fig. 3A and fig. 3B are schematic operation waveforms respectively illustrating a driving method of a display device according to an embodiment of the invention.
Wherein, the reference numbers:
200: display device
210: time sequence controller
220: display panel
230: driving circuit
231: gate driver
232: source driver
FP 1-FP 4: frame period of image
S110 to S140: steps of the driving method
SP 11-SP 1M + N, SP21, SP22, SP 31-SP 3A + N, SP41, SP 42: sub-picture frame period
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Referring to fig. 1 and fig. 2 synchronously, in which fig. 1 is a flowchart illustrating a driving method of a display device according to an embodiment of the invention, and fig. 2 is a schematic diagram illustrating the display device according to the embodiment of the invention. In fig. 2, the display device 200 includes a timing controller 210, a display panel 220, and a driving circuit 230. The driving circuit 230 is coupled to the display panel 220 and configured to generate a driving signal to drive the display panel 220. The timing controller 210 is coupled to the driving circuit 230 and is used for controlling operations of the driving circuit 230, such as timing and data transmission. The driving circuit 230 includes a gate driver 231 and a source driver 232. The gate driver 231 generates gate driving signals to scan a plurality of gate lines on the display panel 220. The source driver 232 generates a source driving signal for writing the display data into the pixels of the display panel 220 in cooperation with the scanning of the gate driving signal.
In the present embodiment, the method flow of fig. 1 can be implemented when the image update frequency of the display device 200 is lower than a predetermined value. In step S110, the timing controller 210 may divide one image frame period (frame period) into a plurality of sub-frame periods (sub-frame periods). In step S120, the timing controller 210 may sequentially receive a plurality of display data and determine a change state between two adjacent display data in the time sequence while the display operation is in progress. In step S130, the timing controller 210 may drive the source driver 231 to write each of the display data to the pixels of the display panel in one or more first sub-frame periods of the plurality of sub-frame periods, and stop writing to the pixels of the display panel by the source driver 231 in a plurality of second sub-frame periods of the plurality of sub-frame periods. In step S130, the first sub-picture frame period may occur in the second sub-picture frame period, and when the number of the first sub-picture frame periods is plural, the plural first sub-picture frame periods may occur continuously. The second sub-picture frame period also occurs continuously. In addition, in the embodiment of the present invention, the first number of the first sub-image frame period is not greater than the second number of the second sub-image frame period.
In step S140, the timing controller 210 may adjust the first number of the first sub-image frame periods and the second number of the second sub-image frame periods according to a change state between two adjacent display data in the time sequence. In detail, when the timing controller 210 determines that the display data to be written at present and the display data written at the previous time are identical to each other, the timing controller 210 may set the first number of the first sub-image frame periods to be equal to 1. In contrast, when the timing controller 210 determines that the display data to be written currently and the display data written last time are different from each other, the timing controller 210 may set the first number of the first sub-image frame periods to be equal to m. Where m is greater than 1 and less than or equal to the second number of second sub-picture frame periods.
It should be noted that, in the present embodiment, the value of m may be a floating value. The value of m may be set, for example, according to a difference between a gray scale value of display data to be written at present and a gray scale value of display data to be written at the previous time. For example, in an embodiment of the present invention, when a difference between a gray level of display data to be written currently and a gray level of display data written last time is greater than a first reference value, the value m may be a first value; when the difference between the gray level of the display data to be written currently and the gray level of the display data written last time is between the first reference value and a second reference value, the value m can be a second value; when the difference between the gray level of the display data to be written currently and the gray level of the display data written last time is between the second reference value and a third reference value, the value of m may be the third value. Wherein, when the first reference value < the second reference value < the third reference value, the first value < the second value < the third value.
In the above embodiment, the gray scale value of the display data to be written currently may be generated by calculating a sum or an average of the gray scale values of the display data to be written currently, and the gray scale value of the display data to be written last may be generated by calculating a sum or an average of the gray scale values of the display data to be written last.
On the other hand, the value of m can be set by an experiment in which the display device 200 is actually measured. When the display device 200 is operated in a low image update frequency state, the tester can display a first display frame by the display device 200 first, and then display a second different display frame. The tester can find out the better value of m by adjusting the value of m and by actually observing the display attenuation of the measurement display panel 220.
Incidentally, in the embodiment of the present invention, the display data received by the display device 200 corresponds to one or more still images. In addition, the operation flow of fig. 1 of the present invention can be operated when the image update frequency corresponding to the image frame period of the display device 200 is a variable value lower than 30 hz, for example, between 30 hz and 0.1 hz.
In addition, in the embodiment of the invention, the display panel 220 may be a light emitting diode display panel, and the gate driving circuit 231 and the source driving circuit 232 may be implemented by using a gate driver and a source driver, which are well known to those skilled in the art, without limitation. The timing controller 210 can be implemented by using digital circuits.
Referring to fig. 3A and 3B, fig. 3A and 3B respectively illustrate operation waveforms of a driving method of a display device according to an embodiment of the invention. In fig. 3A, when the display device operates in a state of low image update frequency, the timing controller receives a first display data in the first image frame period FP 1. Based on the first display data being new display data, the timing controller can set M first sub-image frame periods SP 11-SP 1M and N second sub-image frame periods SP1M + 1-SP 1M + N in the first image frame period FP1, where N is not less than M and N, M are positive integers. In this embodiment, M is a floating value and can be dynamically adjusted. The temporal length of the first image frame period FP1 is then equal to the temporal length of the M + N sub-image frame periods. The timing controller may perform a scanning operation of the gate driving signal of the gate driver by the source driver, and repeatedly perform a writing operation of the first display data to the pixels of the display panel in the M first sub-image frame periods SP11 to SP 1M. In each of the first sub-image frame periods SP 11-SP 1M, the writing of the first display data is performed once for all the pixels of the display panel.
Then, in the N second sub-image frame periods SP1M +1 to SP1M + N, the source driver stops the data writing operation for the pixels of the display panel and is in a skip (skip) state.
In this embodiment, the value of N in the second sub-image frame periods SP1M + 1-SP 1M + N may represent the frequency reduction degree of the display panel, wherein when N is 0, the display panel is in the display state without frequency reduction, and when N is a relatively large value, the image frame period of the display panel may have a relatively large value.
Next, in the second image frame period FP2, the timing controller receives second display data identical to the first display data. The timing controller may determine that there is no difference between the first display data and the second display data, and set one first sub-picture frame period SP21 and a plurality of second sub-picture frame periods SP22 … in the second picture frame period FP 2. The timing controller drives the source driver to perform a scanning operation in accordance with the gate signal driven by the gate driver, and writes the second display data once for the pixels of the display panel in a first sub-image frame period SP 21. And skips over to stop the writing of the second display data in the subsequent second sub-image frame periods SP 22.
Continuing with FIG. 3A, in FIG. 3B, in the third frame period FP3, the timing controller receives a third display data. Based on the third display data being different from the second display data, the timing controller may set a first sub-image frame periods SP31 to SP3A and N second sub-image frame periods SP3A +1 to SP3A + N in the third image frame period FP3, where N is not less than a, and a is a positive integer. The timing controller may repeat a writing operation of third display data to the pixels of the display panel in the a first sub-image frame periods SP31 to SP3A by the source driver in conjunction with a scanning operation of the gate driving signal of the gate driver. In each of the first sub-image frame periods SP 31-SP 3A, the writing of the third display data is performed once for all the pixels of the display panel. In this embodiment, a is a floating value and can be dynamically adjusted. The temporal length of the first image frame period FP3 is then equal to the temporal length of the a + N sub-image frame periods.
In the N second sub-image frame periods SP3A +1 to SP3A + N, the source driver stops the data writing operation for the pixels of the display panel and skips (skip).
Next, in the fourth image frame period FP4, the timing controller receives fourth display data different from the third display data. The timing controller may set a plurality of first sub-image frame periods SP41, SP42, …, and a plurality of second sub-image frame periods (not shown) in the fourth image frame period FP 4. The timing controller drives the source driver to write the fourth display data once for the pixels of the display panel in the first sub-image frame periods SP41, SP42, … in coordination with the scanning of the gate signals driven by the gate. And skipping to stop the writing of the second display data in the subsequent second sub-image frame periods.
In the above embodiment, the number of the first sub-image frame periods FP1, FP3 and FP4 may be the same or different among the first image frame period FP1, the third image frame period FP3 and the fourth image frame period FP 4. In an embodiment of the invention, the timing controller may set the number of the first sub-frame periods in the first frame period FP1, the third frame period FP3 and the fourth frame period FP4 according to a gray scale value of the first display data, a difference between gray scale values of the second display data and the third display data, and a difference between gray scale values of the third display data and the fourth display data, respectively.
In summary, in the state where the display device operates at a low image update frequency, when the display data to be written is different, the display data is repeatedly written in a plurality of sub-image frame periods, so that the electric quantity of the capacitor in the pixel cannot be charged (or discharged) to a correct level, and the possibility of image persistence is reduced.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of driving a display device, comprising:
distinguishing one image frame period into a plurality of sub-image frame periods;
sequentially receiving a plurality of display data and judging a change state of two adjacent display data;
writing each display data into a plurality of pixels of the display panel in at least one first sub-picture frame period of the sub-picture frame periods, and stopping writing the pixels in a plurality of second sub-picture frame periods of the sub-picture frame periods; and
adjusting a first number of the at least one first sub-frame period according to the variation state, wherein the first number of the first sub-frame periods is not greater than a second number of the second sub-frame periods.
2. The driving method as claimed in claim 1, wherein the step of adjusting the first number of the at least one first sub-image frame period according to the changing status of two adjacent display data comprises:
when the adjacent two display data are identical to each other, the first number is equal to 1; and
when two adjacent display data are different from each other, the first number is equal to m, wherein m is greater than 1 and not greater than the second value.
3. The driving method as claimed in claim 2, wherein the value of m is associated with a gray level difference between two adjacent display data.
4. The driving method as claimed in claim 1, wherein the display data corresponds to at least one still image.
5. The driving method as claimed in claim 1, wherein the image update frequency corresponding to the image frame period is variable and lower than 30 Hz.
6. A display device, comprising:
a display panel;
a driving circuit for driving the display panel; and
a timing controller coupled to the driving circuit, the timing controller being configured to:
distinguishing one image frame period into a plurality of sub-image frame periods;
sequentially receiving a plurality of display data and judging a change state of two adjacent display data;
in at least one first sub-frame period of the sub-frame periods, performing writing action of the display data on a plurality of pixels of the display panel through the driving circuit, and stopping the writing action of the pixels in a plurality of second sub-frame periods of the sub-frame periods; and
adjusting a first number of the first sub-frame periods according to the variation state, wherein the first number of the at least one first sub-frame period is not greater than a second number of the second sub-frame periods.
7. The display device of claim 6, wherein the timing controller is configured to:
when two adjacent display data are the same with each other, making the first number equal to 1; and
when two adjacent display data are different from each other, the first number is equal to m, wherein m is greater than 1 and not greater than the second value.
8. The display apparatus according to claim 7, wherein the value of m is associated with a gray-scale difference between two adjacent display data.
9. The display device according to claim 6, wherein the display data corresponds to at least one still image.
10. The display apparatus according to claim 6, wherein the image frame period corresponds to an image update frequency that is variable and lower than 30 Hz.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110140699 | 2021-11-02 | ||
| TW110140699A TWI795976B (en) | 2021-11-02 | 2021-11-02 | Display device and driving method thereof |
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| Publication Number | Publication Date |
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| CN114283735A true CN114283735A (en) | 2022-04-05 |
| CN114283735B CN114283735B (en) | 2023-06-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1253577A1 (en) * | 2001-03-30 | 2002-10-30 | Matsushita Electric Industrial Co., Ltd. | Illumination control arrangement and liquid crystal display device |
| TWI226949B (en) * | 1999-07-29 | 2005-01-21 | Nec Lcd Technologies Ltd | Liquid crystal display device capable of displaying high quality moving picture |
| TW200832350A (en) * | 2007-01-29 | 2008-08-01 | Benq Corp | Method and related device of increasing efficiency of video display |
| JP2013174739A (en) * | 2012-02-24 | 2013-09-05 | Panasonic Corp | Display device and drive method thereof |
| US20160063933A1 (en) * | 2013-04-02 | 2016-03-03 | Sharp Kabushiki Kaisha | Liquid crystal display device and driving method therefor |
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2021
- 2021-11-02 TW TW110140699A patent/TWI795976B/en active
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- 2022-02-11 CN CN202210128164.7A patent/CN114283735B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI226949B (en) * | 1999-07-29 | 2005-01-21 | Nec Lcd Technologies Ltd | Liquid crystal display device capable of displaying high quality moving picture |
| EP1253577A1 (en) * | 2001-03-30 | 2002-10-30 | Matsushita Electric Industrial Co., Ltd. | Illumination control arrangement and liquid crystal display device |
| TW200832350A (en) * | 2007-01-29 | 2008-08-01 | Benq Corp | Method and related device of increasing efficiency of video display |
| JP2013174739A (en) * | 2012-02-24 | 2013-09-05 | Panasonic Corp | Display device and drive method thereof |
| US20160063933A1 (en) * | 2013-04-02 | 2016-03-03 | Sharp Kabushiki Kaisha | Liquid crystal display device and driving method therefor |
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| Publication number | Publication date |
|---|---|
| CN114283735B (en) | 2023-06-30 |
| TWI795976B (en) | 2023-03-11 |
| TW202320052A (en) | 2023-05-16 |
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