Patent Grant
10977986
This application is a National Stage entry under § 371 of International Application No. PCT/CN2018/082897, filed on Apr. 13, 2018, and claims priority to Chinese Patent Application No. 201710369581.x, filed on May 23, 2017, the entire contents of which are hereby incorporated as reference.
The present disclosure relates to the field of display panels, and in particular relates to a preset reverse driving method applied in a video display process.
The lifetime of quantum dot light-emitting diodes (QLEDs) has always been a bottleneck restricting its wide application. In addition to optimizing materials, devices, and fabrication processes, driving quantum dot light-emitting diodes may also be an approach to decrease the attenuation of the QLEDs and enhance the lifetime of the QLEDs.
A quantum dot light-emitting diode is generally composed of a first electrode, a hole transport layer, a quantum dot light-emitting layer, an electron transport layer, and a second electrode. Since different layers have different energy levels (that is, there exists an energy level difference), during operation, electric charges accumulate at the interface between two energy levels, especially the interface in contact with the quantum dot light-emitting layer. This can greatly affect the luminescent properties of the quantum dots, thereby reducing the luminous intensity; and these defects also limit the carriers. As the operating time of a quantum dot light-emitting diode increases, more and more electric charges are confined to the interface, which serves as the center of quenching photons, thereby greatly reducing the luminous intensity and shortening the lifetime of quantum dot light-emitting diodes.
Also, in a video display process, when the LED in the display panel is a quantum dot light-emitting diode, the accumulation of charges may seriously affect the brightness of the video display and the lifetime of the video display panel when driving the video content display.
Therefore, the above technology has yet to be improved and developed.
In view of the above deficiencies of the prior art, an objective of the present disclosure is to provide a preconfigured reverse driving method applied in a video display process, which aims to solve the problem that the video display brightness and the lifetime of the video display panel is seriously affected by long-time accumulation of electric charges in existing video displaying processes.
The technical solutions of the present disclosure are as follows:
A preconfigured reverse driving method applied in a video displaying process, comprising the steps of:
Step A: Pre-acquiring display content of a plurality of later frames for pixels in the video by content loading;
Step B: Adding a reverse driving signal before each forward driving signal for driving the display content of the plurality of frames, to suppress accumulation of electric charges on the pixels in the video display panel in advance.
In the preconfigured reverse driving method applied in a video displaying process, the intensity of the reverse driving signal is proportional to the intensity of the forward driving signal.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal is one of: a reverse voltage, a reverse current, or an alternation of the reverse voltage and the reverse current.
In the preconfigured reverse driving method applied in a video displaying process, the reverse voltage is lower than a breakdown voltage of a video display panel.
In the preconfigured reverse driving method applied in a video displaying process, the reverse current is lower than a breakdown current of a video display panel.
In the preconfigured reverse driving method applied in a video displaying process, the waveform of the reverse driving signal is at least one of: a square wave, a triangular wave, a ramp wave or a sine wave.
In the preconfigured reverse driving method applied in a video displaying process, when the reverse driving signal is an alternation of the reverse voltage and the reverse current, a percentage of a sum of a time for the reverse voltage and a time for the reverse current in a cycle is 1% to 99%.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal and the forward driving signal constitute a driving cycle, when the reverse driving signal is an alternation of the reverse voltage and the reverse current, a percentage of a sum of a time for the reverse voltage and a time for the reverse current in a cycle is 10% to 60%.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal and the forward driving signal constitute a driving cycle, when the reverse driving signal is a reverse voltage, a percentage of a time for the reverse voltage in a cycle is 1% to 99%; or a frequency of the reverse voltage is not less than 60 Hz; or an amplitude of the reverse voltage is −0.1V to −10V.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal and the forward driving signal constitute a driving cycle, when the reverse driving signal is a reverse voltage, a percentage of a time for the reverse voltage in a cycle is 10% to 60%; or t frequency of the reverse voltage is 60-240 Hz; or the magnitude of the reverse voltage is −1V to −5V.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal and the forward driving signal constitute a driving cycle. When the reverse driving signal is a reverse current, a percentage of a time for the current in a cycle is 1% to 99%; the frequency of the reverse current is not less than 60 Hz; or the magnitude of the reverse current is −0.0001 Am/cm−2 to −1 Am/cm−2.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal and the forward driving signal constitute a driving cycle. When the reverse driving signal is a reverse current, a percentage of a time for the reverse current in a cycle is 10% to 60%; or the frequency of the reverse current is 60-240 Hz; or the magnitude of the reverse current is −0.0001 Am/cm−2 to −0.1 Am/cm−2.
In the method applied in a preconfigured reverse driving method in a video displaying process, a vacant driving signal is in the middle of the reverse driving signal.
In the preconfigured reverse driving method applied in the video displaying process, the reverse driving signal, the forward driving signal and the vacant driving signal constitute a driving cycle, and the percentage of the time for the vacant driving signal in a cycle is 0%-15%.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle. When the reverse driving signal is an alternation of the reverse voltage and the reverse current, the percentage of a sum of a time for the reverse voltage and a time for the reverse current in a cycle is 1% to 99%.
In the preconfigured reverse driving method applied in a video displaying process, wherein the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle. When the reverse driving signal is an alternation of the reverse voltage and the reverse current, the sum of a time for the reverse voltage and the percentage of a time for the reverse current in a cycle is 10% to 60%.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle. When the reverse driving signal is a reverse voltage, the percentage of the time for the reverse voltage in a cycle is 1% to 99%; or the frequency of the reverse voltage is not less than 60 Hz; or the magnitude of the reverse voltage is −0.1V to −10V.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle. When the reverse driving signal is a reverse voltage, the percentage of the time for the reverse voltage in a cycle is 10%-60%; or the frequency of the reverse voltage is between 60 Hz and 240 Hz; or the amplitude of the reverse voltage is −1V to −5V.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle, when the reverse driving signal is a reverse current, a percentage of the time for the reverse current in a cycle is 1%-99%; or a frequency of the reverse current is not less than 60 Hz; or the amplitude of the reverse current is −0.0001 Am/cm−2 to −1 Am/cm−2.
In the preconfigured reverse driving method applied in a video displaying process, the reverse driving signal, the forward driving signal, and the vacant driving signal constitute a driving cycle, when the reverse driving signal is a reverse current, the percentage of the time for the reverse current in a cycle is 10%-60% of the cycle; or a frequency of the reverse current is 60 to 240 Hz; or an amplitude of the reverse current is −0.0001 Am/cm−2 to −0.1 Am/cm−2.
The present disclosure provides a preconfigured reverse driving method applied in a video displaying process: pre-acquiring display content of a plurality of later frames for pixels in a video by content loading; adding a reverse driving signal before each forward driving signal for driving the display content of the plurality of frames, to suppress accumulation of electric charges on pixels in a video display panel in advance. The reverse driving signal changes the barrier of the defect potential well, eliminates confinement and accumulation of the electric charges in the potential well, reduces the density of the electric charges, which increases the brightness of the video display and extends the lifetime of the video display panel.
The present disclosure provides a preconfigured reverse driving method applied in a video display process. In order to make the objects, technical solutions and effects of the present disclosure clear, the present disclosure will be further described in detail below. It is understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure.
The present disclosure provides a preconfigured reverse driving method applied in a video displaying process, wherein, as shown in
S100: Pre-acquiring display content of a plurality of later frames for video pixels by content loading;
S200: Adding a reverse driving signal before each forward driving signal for driving the display content of the plurality of frames, to suppress accumulation of electric charges on pixels in a video display panel in advance.
Specifically, in a display mode of a fixed content such as a movie video, the display panel may pre-acquire the display content of the plurality of later frames for pixels by content loading; that is, the display panel can acquire the display content of a plurality of frames after the current image when playing the current image. In the present disclosure, an example illustrates acquiring the display content of the four later frames for pixels, as shown in
Further, the reverse driving signal is also applied when a pixel is not yet illuminated, because in the video displaying process, the content of several frames after the current image can be acquired in advance by content loading; that is, during the video displaying process of the display panel, information on which pixels will be illuminated and which pixels will not be illuminated in subsequent images can be pre-acquired. Based on the above, in the present disclosure, adding a reverse driving signal in advance to unilluminated pixels in the subsequent images, can suppress the accumulation of electric charges of pixels in the video display panel in advance accordingly.
Further, as shown in
Further, as shown in
Further, in the present disclosure, the reverse driving signal is one of: a reverse voltage, a reverse current, or an alternation of the reverse voltage and the reverse current.
Specifically, when the forward driving signal drives a pre-played video display content, applying a reverse voltage, a reverse current, or an alternation of the reverse voltage and the reverse current, to the video display panel.
When the applied reverse driving signal is a reverse voltage, pixels on the video display panel are in a certain reverse electric field. In the reverse electric field, the electric charges accumulated near the interface can be driven to outside the device by the reverse electric field. In addition, by adjusting an intensity of the reverse electric field, a barrier of the defect potential well may be changed, so that electric charges confined in the potential well can escape, thereby reducing the density of confined electric charges.
The adjustment of the strength of the reverse electric field can be performed by adjusting a time for the reverse voltage, a frequency of the reverse voltage, and an amplitude of the reverse voltage.
Specifically, a percentage of a time for the applied reverse voltage in a cycle, r, is 1%-99%; and the time for the reverse voltage, the application time, can affect brightness and driving mode of the video display. Preferably, the percentage of the time for the reverse voltage in a cycle, r, can be set to 10% to 60%, and the selection of this range does not affect the brightness and the driving mode, and can effectively provide the required voltage for recovery.
Specifically, for the frequency of the reverse voltage, the frequency of the applied reverse voltage should be not less than 60 Hz; preferably, the frequency of the reverse voltage can be set to 60 to 240 Hz because when the frequency of the reverse voltage is higher 240 Hz, the complexity of the circuit can be increased, the cost can be increased, and the required direction driving load can be too large.
Specifically, for the amplitude of the reverse voltage, the amplitude of the applied reverse voltage is −0.1 V to −10 V. Preferably, the amplitude of the reverse voltage can be set to −1 V to −5 V, and the voltage in this amplitude range can be provided by existing circuit board; no need to replace the circuit board. Meanwhile, the voltage amplitude cannot be too low, the elimination effect of the electric charges can be affected when the voltage is lower than −1V. The reverse driving voltage should be less than the breakdown voltage of the video display panel.
When the applied reverse drive signal is a reverse current, the reverse current injects certain electrons and holes into pixels on the video display panel, thereby neutralizing the counter-type carriers confined in the pixels, thereby reducing the density of the confined electric charges.
Specifically, for the time for the applied reverse current, the percentage of the time for the reverse current in a cycle is controlled to be 1% to 99%; preferably, the percentage of the time for the reverse current in a cycle, r, can be set to 10% to 60%, the selection of this range does not affect the brightness and the driving mode, and can provide the required current for recovery.
Specifically, for the frequency of the reverse current, the frequency of the reverse current is controlled to be not less than 60 Hz; preferably, the frequency of the reverse current is set to 60 to 240 Hz. When the frequency of the reverse current is higher than 240 Hz, the complexity of the circuit can be increased, the cost can be increased, and the required direction driving load can be too large.
Specifically, for the amplitude of the reverse current, the amplitude of the applied reverse current is controlled to be −0.0001 Am/cm−2 to −1 Am/cm−2. Preferably, the amplitude of the reverse current is set to −0.0001 Am/cm−2 to −0.1 Am/cm−2 because current that is too small results in unapparent electric charge elimination effect. Meanwhile, the reverse current should be lower than the breakdown current of the video display panel to ensure that the device will not be burned out.
Further, in the present disclosure, the waveform of the reverse voltage is one of: a square wave, a triangular wave, a ramp wave or a sine wave; the waveform of the reverse current may also be one of: a square wave, a triangular wave, a ramp wave or a sine wave.
The driving method of the video display panel will be further explained by specific embodiments.
When the reverse driving signal is a square wave reverse voltage, as shown in
Specifically, when the frequency of the reverse voltage, f, is 60 Hz, the percentage of the time for the reverse voltage in a cycle, r, is 50%, and the amplitude of the reverse voltage, Vre, is −3 V, as shown in
When the reverse drive signal is a square wave reverse voltage, as shown in
Specifically, when the frequency of the reverse voltage, f, is 100 Hz, the percentage of the time for the reverse voltage following the forward driving signal in a cycle, ra, is 0%; the percentage of the time for the reverse voltage following the vacant driving signal in a cycle, rb, is 20%; the percentage of the time for the vacant driving signal in a cycle, r0, is 15%; and the amplitude of the reverse voltage, Vre, is −3V. As shown in
When the reverse drive signal is a square wave reverse current, as shown in
Specifically, when the frequency of the reverse current, f, is 60 Hz, the percentage of the time for the reverse current in a cycle, r, is 50%, and the amplitude of the reverse current, Ire, is −0.001 Am/cm−2, as shown in
When the reverse driving signal is a square wave reverse current, as shown in
Specifically, when the frequency of the reverse current, f, is 120 Hz, and the percentage of the time for the reverse current following the forward driving signal in a cycle, ra, is 30%; the percentage of the time for the reverse current following the vacant driving signal in a cycle, rb, is 0%; the percentage of the time for the vacant driving signal in a cycle, r0, is 15%; and the amplitude of the reverse current, Ire, is −0.002 Am/cm−2, as shown in
When the reverse driving signal is an alternation of a square wave reverse voltage and a square wave reverse current, and the reverse driving signal does not have a vacant driving signal, as shown in
Specifically, when the driving frequency, f, is 80 Hz, the percentage of the time for the reverse current in a cycle is 50%, the amplitude of the reverse current, Ire, is −0.001 Am/cm−2, and the time for the reverse voltage in a cycle, rV, is 40%, and the amplitude of the reverse voltage is −3V. As shown in
When the reverse driving signal is an alternation of a square wave reverse voltage and a square wave reverse current, and there is a vacant driving signal in the reverse driving signal, as shown in
Specifically, when the frequency of the reverse current, f, is 120 Hz, the percentage of the time for the reverse current following the forward driving signal in a cycle, rI, is 30%; the percentage of the time for the reverse voltage following the vacant driving signal in a cycle, rV, is 10%; the percentage of the time for the vacant driving signal in a cycle, r0, is 15%; the amplitude of the reverse current, Ire, is −0.002 Am/cm−2; and the amplitude of the reverse voltage is −2 V, as shown in
When the reverse driving signal is a triangular wave reverse voltage, as shown in
Specifically, when the frequency of the reverse voltage, f, is 60 Hz, the percentage of the time for the reverse voltage in a cycle, r, is 50%; the amplitude of the reverse voltage, Vre, is −3 V, as shown in
When the reverse driving signal is a triangular wave reverse voltage, and the triangular wave reverse voltage is applied to a negative voltage, Vre, as shown in
Specifically, when the frequency f of the reverse voltage is 60 Hz, the percentage of the time for the reverse voltage in a cycle is 50%, and the amplitude of the reverse voltage Vre+Vtr is −5 V, as shown in
When the reverse driving signal is a ramp reverse voltage and the ramp reverse voltage is applied to a negative voltage, Vre, as shown in
Specifically, when the frequency of the reverse voltage, f, is 60 Hz, the percentage of the time for the reverse voltage in a cycle is 50%, and the amplitude of the reverse voltage, Vre+Vtr, is −5 V, as shown in
When the direction driving signal is a sine wave reverse voltage, as shown in
Specifically, when the frequency of the reverse voltage, f, is 60 Hz, the percentage of the time for the sine wave reverse voltage, r, is 50%, and the amplitude of the reverse voltage, Vre, is −3 V, as shown in
In summary, the present disclosure provides a preconfigured reverse driving method applied in a video displaying process, pre-acquiring display contents of a plurality of later frames for pixels which are already lit in a video by content loading; adding a reverse driving signal before each forward driving signals for driving the display content of the plurality of frames, to suppress accumulation of electric charges on pixels in a video display panel in advance; the reverse driving signal changes the barrier of the defect potential well, eliminating the electric charges confined and accumulated in the potential well, reducing the density of the confined electric charges, thereby increasing the brightness of the video display and extending the lifetime of the video display panel.
It is to be understood that the application of the present disclosure is not limited to the above-described examples, and those skilled in the art can make modifications and variations in accordance with the above description, all of which are within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201710369581.X | May 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/082897 | 4/13/2018 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2018/214667 | 11/29/2018 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 6201520 | Iketsu et al. | Mar 2001 | B1 |
| 20020140691 | Sato | Oct 2002 | A1 |
| 20030043090 | Yazawa et al. | Mar 2003 | A1 |
| 20050078078 | Morita | Apr 2005 | A1 |
| 20060022900 | Miyake et al. | Feb 2006 | A1 |
| 20060197462 | Uchiyama et al. | Sep 2006 | A1 |
| 20070024537 | Choong et al. | Feb 2007 | A1 |
| 20070146394 | Ahn | Jun 2007 | A1 |
| 20070262920 | Werner et al. | Nov 2007 | A1 |
| 20080309234 | Cho et al. | Dec 2008 | A1 |
| 20090219231 | Yamamoto et al. | Sep 2009 | A1 |
| 20100283045 | Uchida | Nov 2010 | A1 |
| 20130069552 | Aurongzeb et al. | Mar 2013 | A1 |
| 20140138664 | Matsuura et al. | May 2014 | A1 |
| 20160042719 | Muramatsu | Feb 2016 | A1 |
| 20170061839 | Park et al. | Mar 2017 | A1 |
| Number | Date | Country |
|---|---|---|
| 1588515 | Mar 2005 | CN |
| 1828707 | Sep 2006 | CN |
| 1886015 | Dec 2006 | CN |
| 1991947 | Jul 2007 | CN |
| 101266748 | Sep 2008 | CN |
| 101276564 | Oct 2008 | CN |
| 101990347 | Mar 2011 | CN |
| 1991947 | Apr 2011 | CN |
| 102136243 | Jul 2011 | CN |
| 103456277 | Dec 2013 | CN |
| 104362258 | Feb 2015 | CN |
| 105047138 | Nov 2015 | CN |
| 105792430 | Jul 2016 | CN |
| 106098956 | Nov 2016 | CN |
| 106549111 | Mar 2017 | CN |
| 2006119179 | May 2006 | JP |
| 2006215255 | Aug 2006 | JP |
| 2007079545 | Mar 2007 | JP |
| 2009204887 | Sep 2009 | JP |
| 100841850 | Jun 2008 | KR |
| 2017052727 | Mar 2017 | WO |
| Entry |
|---|
| The World Intellectual Property Organization (WIPO) International Search Report for PCT/CN2018/082897 dated Jun. 22, 2018 5 Pages. |
| Number | Date | Country | |
|---|---|---|---|
| 20200312227 A1 | Oct 2020 | US |
