CN109903716B - Pixel unit charging method and device and display device - Google Patents
Pixel unit charging method and device and display device Download PDFInfo
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Abstract
The invention discloses a charging method and device of a pixel unit and a display device, and belongs to the technical field of display. The method comprises the following steps: acquiring a data signal to be charged for charging a pixel unit to be charged and a data signal to be charged for charging a pixel unit to be charged, wherein the pixel unit to be charged and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in a display panel; determining a compensation signal for charging the pixel unit to be charged based on the charged data signal and the data signal to be charged; and charging the pixel unit to be charged in a compensation charging period by adopting the compensation signal, wherein the compensation charging period is positioned in the charging period of the pixel unit. The invention can reduce the influence of insufficient charging on the display effect of the display panel.
Description
Technical Field
The present invention relates to the field of display, and in particular, to a method and an apparatus for charging a pixel unit, and a display device.
Background
The display device includes: a display panel and a driving circuit for driving the display panel to display. The display panel includes a plurality of pixel units defined by a plurality of data lines and a plurality of gate lines crossing each other. And each pixel unit is connected with the gate line and the data line. The driving circuit may include a gate driving circuit and a source driving circuit. The source electrode driving circuit provides data signals for the pixel units through the data lines and charges the pixel units so as to control the display panel to display images.
In the related art, a plurality of pixel units are typically charged sequentially in a row-by-row and column-by-column scanning manner, and the charging time of each pixel unit is the same. In the charging process, whether to charge the pixel cell connected to the gate line may be controlled by the gate line, and a data signal for charging the pixel cell may be supplied through the data line.
However, since the charging time of each pixel unit is limited and the charging time of each pixel unit is the same, at least part of the pixel units have a problem of insufficient charging, which affects the display effect of the display panel.
Disclosure of Invention
The embodiment of the invention provides a charging method and device for a pixel unit and a display device, which can solve the problem that the pixel unit in the related art has insufficient charging and affects the display efficiency of a display panel. The technical scheme is as follows:
In one aspect, a method for charging a pixel unit is provided, the method including:
acquiring a data signal to be charged for charging a pixel unit to be charged and a data signal to be charged for charging a pixel unit to be charged, wherein the pixel unit to be charged and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in a display panel;
determining a compensation signal for charging the pixel unit to be charged based on the charged data signal and the data signal to be charged;
and charging the pixel unit to be charged in a compensation charging period by adopting the compensation signal, wherein the compensation charging period is positioned in the charging period of the pixel unit.
Optionally, the determining, based on the charged data signal and the data signal to be charged, a compensation signal for charging the pixel unit to be charged includes:
determining a compensation difference signal based on the charged data signal and the data signal to be charged;
and determining the superposition signal of the compensation difference signal and the data signal to be charged as the compensation signal.
Optionally, the determining a compensation difference signal based on the charged data signal and the data signal to be charged includes:
acquiring a first display gray scale displayed by the charged pixel unit under the drive of the charged data signal based on the charged data signal;
acquiring a second display gray scale displayed by the pixel unit to be charged under the drive of the charged data signal based on the data signal to be charged;
and determining the compensation difference signal based on the gray level difference of the first display gray level and the second display gray level.
Optionally, the determining the compensation difference signal based on the gray level difference between the first display gray level and the second display gray level includes:
if the gray level difference is within the reference gray level difference range, and when the gray level difference is within [8× (P-1) +1,8×p ], determining the superimposed signal of the P compensation unit signals as the compensation difference signal, wherein P is a positive integer.
Optionally, the display panel includes a plurality of pixel units arranged in an array, the data lines are configured to provide data signals for pixel units located in a same scanning column, and the charged pixel units are pixel units in a scanning line previous to the scanning line where the pixel unit to be charged is located.
Optionally, before the pixel unit to be charged is charged in the compensation charging period using the compensation signal, the method further includes:
determining a target display partition where the pixel unit to be charged is located, wherein the display panel comprises: n display partitions which are arranged from near to far to a data signal end, wherein the data signal end is used for providing data signals for the pixel units, and N is a positive integer greater than 1;
determining the order of the target display partition in N display partitions which are arranged in sequence;
and determining the duration of the compensation charging period based on the sequence and the duration of the charging period, and determining the starting point of the charging period as the starting point of the compensation charging period.
Optionally, the charging period of the pixel unit further includes: other charging periods, after said charging the pixel cell to be charged with the compensation signal in a compensation charging period, the method further comprises:
and charging the pixel unit to be charged in the other charging time periods by adopting the data signal to be charged.
In another aspect, there is provided a charging device for a pixel unit, the device including:
The device comprises an acquisition module, a display module and a charging module, wherein the acquisition module is used for acquiring a data signal to be charged for charging a pixel unit to be charged and a data signal to be charged for charging a pixel unit to be charged, the charged pixel unit and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in the display panel;
a determining module, configured to determine a compensation signal for charging the pixel unit to be charged based on the charged data signal and the data signal to be charged;
and the control module is used for controlling the pixel unit to be charged in a compensation charging period by adopting the compensation signal, and the compensation charging period is positioned in the charging period of the pixel unit.
Optionally, the charging period of the pixel unit further includes: and the control module is further used for controlling the data signal to be charged to charge the pixel unit to be charged in the other charging period after controlling the pixel unit to be charged in the compensation charging period by adopting the compensation signal.
In still another aspect, there is provided a display device including: the charging device for a pixel unit according to any one of the second aspects.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
according to the pixel unit charging method, the pixel unit charging device and the display device, the pixel unit to be charged is charged in the compensation charging period by determining the compensation signal for charging the pixel unit to be charged, and the compensation charging period is located in the charging period of the pixel unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a conventional touch display device in which a display driver and a touch driver operate simultaneously;
Fig. 2 is a schematic diagram of a display driver and a touch driver in a display device with a display refresh frequency of 60 hz according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a display driver and a touch driver in a display device with a display refresh frequency of 120 hz according to an embodiment of the present invention;
fig. 4 is a schematic diagram of voltage waveforms of a pixel electrode in a pixel unit in a process of charging the pixel unit by using a related technology according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for charging a pixel unit according to an embodiment of the present invention;
fig. 6 is a flowchart of another method for charging a pixel unit according to an embodiment of the present invention;
fig. 7 is a block diagram of a source driving circuit according to an embodiment of the present invention;
FIG. 8 is a diagram showing the connection between the latch module and the output buffer amplifier in FIG. 7;
FIG. 9 is a flow chart of a method for determining a compensation difference signal according to an embodiment of the present invention;
FIG. 10 is a flow chart of a method for determining a compensated charging period provided by an embodiment of the invention;
FIG. 11 is a schematic diagram illustrating a partition of a display panel according to an embodiment of the present invention;
FIG. 12 is a flowchart of another method for determining a compensated charging period provided by an embodiment of the invention;
Fig. 13 is a timing chart of charging pixel units of two adjacent scan lines by using the charging method according to the embodiment of the present invention;
fig. 14 is a schematic diagram of voltage waveforms of a pixel electrode in a pixel unit in a process of charging the pixel unit by using the charging method according to the embodiment of the present invention;
fig. 15 is a schematic structural diagram of a charging device for a pixel unit according to an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a determining module according to an embodiment of the present invention.
Detailed Description
In order to make the principles and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
With the development of display technology, the functions of the display device are more and more diversified, and accordingly, higher requirements are put on the charging effect of the pixel units in the display device.
For example, in a conventional touch display device, as shown in fig. 1, a display drive and a touch drive are operated simultaneously. In a touch display integrated (touch display driver integrate, TDDI) display device, please refer to fig. 2 and 3, the display driving and the touch driving are operated in a time-sharing manner, so that although the interference between the signal for display and the touch signal can be reduced, the display performance and the touch performance are both improved, compared with a conventional touch display device, the touch driving in the TDDI display device occupies a part of the display time, which results in shortening the charging time of the pixel unit, further resulting in the problem of insufficient charging of the pixel unit, and affecting the display effect of the display device. Particularly, in heavy-duty pictures (pictures with larger brightness contrast in adjacent display areas), the insufficient charging can cause larger difference in brightness of pixel units with different distances from a driving signal end, so that obvious uneven brightness of the display picture of the display device can be caused. And, the effect is more obvious after the point reporting rate technology and the active pen technology are added.
Fig. 2 is a schematic diagram showing time-sharing operation of display driving and touch driving in a display device with a refresh frequency of 60 hertz (Hz), and fig. 3 is a schematic diagram showing time-sharing operation of display driving and touch driving in a display device with a refresh frequency of 120 Hz. In fig. 1 to 3, D represents an operation period of display driving, T represents an operation period of touch driving, and B represents a blanking period during display.
Fig. 4 is a schematic diagram illustrating voltage waveforms of a pixel electrode in a pixel unit in a process of charging the pixel unit using the related art. As shown in fig. 4, t1 is the total time period for charging the pixel unit. t2 is a period of time during which the pixel electrode in the pixel unit performs charge retention under the action of charge retention or the like after the supply of the data signal at the effective potential to the pixel unit is stopped. t3=t1-t 2, t4 is the time period for charging the next pixel unit of the pixel unit, i.e. the period corresponding to t4 can be regarded as the t3 period of the next pixel unit. As can be seen from fig. 4: in the period t3, the voltage of the pixel electrode gradually increases, but due to the longer delay time in the charging process, when the supply of the data signal at the effective potential to the pixel unit is stopped, the pixel electrode is not yet charged to the target voltage, that is, the charging voltage of the pixel electrode cannot reach the desired target voltage in the limited charging time, so that the pixel unit may have a problem of insufficient charging. The delay time in the charging process can be seen from the slope of the waveform in the t3 period, and the delay time in the charging process is longer because the slopes of the waveform in the t3 period are smaller.
For another example, since the TDDI display device has a high cost, the TDDI display devices commonly used in the related art are all of a dual gate structure to reduce the number of integrated circuits (integrated circuit, ICs) in the display device. However, this may result in doubling the number of gate lines in the display device, and thus halving the charging time, and may also result in insufficient charging of the pixel unit, which affects the display effect of the display device.
For this reason, there is a related art in which the charging time is increased in a manner of reducing the load of the display panel in the display device, but the load of the display panel cannot be reduced too much due to the limitations of the process conditions and the product yield, resulting in a risk that the pixel unit is still under-charged. Or, in the related art, there is a scheme of increasing the driving capability of the source driving circuit, for example, a scheme of increasing the driving current of the source driving circuit, which can improve the charging effect of the pixel unit closer to the driving signal terminal, but still cannot improve the charging effect of the pixel unit farther from the driving signal terminal under the condition of larger load of the display panel.
The embodiment of the invention provides a charging method of a pixel unit, which enables the pixel unit to be charged to a target voltage in a charging period of the pixel unit by carrying out compensation charging on the pixel unit, thereby meeting the charging requirement of the pixel unit. As shown in fig. 5, the method may include:
The charged pixel unit and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in the display panel.
The compensation signal is a data signal after the data signal to be charged is adjusted according to the data signal to be charged and the data signal to be charged, the charged data signal and the data signal to be charged can reflect the charging condition of the pixel unit to be charged, and the pixel electrode can be charged to the expected target voltage as much as possible in the charging period of the pixel unit by adopting the compensation signal to carry out compensation charging on the pixel unit to be charged.
In summary, according to the method for charging the pixel unit provided by the embodiment of the invention, by determining the compensation signal for charging the pixel unit to be charged, the pixel unit to be charged is charged in the compensation charging period by adopting the compensation signal, and the compensation charging period is located in the charging period of the pixel unit.
Fig. 6 is a flowchart of another method for charging a pixel unit according to an embodiment of the present invention. And the method can be implemented by various modules in the source drive circuit. Fig. 7 is a block diagram of a source driving circuit according to an embodiment of the present invention. For easy understanding, the following describes the operation principle of the source driving circuit:
as shown in fig. 7, the source driving circuit may include: the device comprises a bidirectional shift register, a data register, a latch module, a level conversion module, a digital-to-analog conversion (D/A) module and an output buffer amplifier. The bidirectional shift register may store the received data signal into the data register according to the start signals SP1 and SP2 and the clock signal CLK, latch the data signal for a certain period (for example, a scan period of 1 horizontal line) through the latch module, then transmit the data signal to the level conversion module, where the level conversion module is used to level convert the received data signal, the converted signal may be called a gray-scale signal (for example, converted into a gray-scale voltage), and transmit the converted gray-scale signal to the D/a module, so as to convert the discrete digital signal into a continuous analog signal, and polarity-convert the converted data signal, and then charge the pixel unit connected to the data line through the output buffer amplifier and the data line.
Wherein the arrows in this fig. 7 are used to indicate the signal flow direction. The signal shown in fig. 7 is only a schematic representation of the signal transmitted in the source driver circuit, and is not intended to limit the signal transmitted in the source driver circuit. For example, the source driving circuit may also have transmitted therein a gamma voltage G, a signal Q for controlling the polarity of a data signal, a latch control signal L for controlling latching, a conversion control signal S for controlling level conversion, and video data signals Vr, vg, vb, etc., which are transmitted to a data register via a data receiver.
Fig. 8 is a diagram showing a connection structure between the latch module and the output buffer amplifier in fig. 7. As shown in fig. 8, the latch module includes: the first latch sub-module and the second latch sub-module. And the source driving circuit may further include: the switching device comprises an amplifier, an acquisition module, a determination module, a control module, a first switching module S1, a second switching module S2, a third switching module S3, a fourth switching module S4, a fifth switching module S5, a sixth switching module S6, a seventh switching module S7 and other switching modules SQ. Wherein, there are two connecting paths between the first latch submodule and the second latch submodule. In one connection path, the first latching submodule may be connected to the second latching submodule via a fifth switching submodule. In another connection path, the first latching submodule may be connected with the second latching submodule sequentially through the first switch module, the acquisition module, the determination module, and the second switch module. The determining module is also connected with the control module, each switch sub-module is also connected with the control module, and the control module is used for providing control signals for the corresponding switch sub-modules so as to control the corresponding switch sub-modules to be turned on or turned off. The amplifier is powered by power supply terminals AVDD and GNDA, and the source driving circuit is powered by a high voltage power supply signal terminal VDD and a low voltage power supply signal terminal VSS. Because the charging method of the pixel unit provided by the embodiment of the invention is mainly implemented through the acquisition module, the determination module and the control module, the working principles of the acquisition module, the determination module and the control module are described below in combination with the steps, so that the working principles of other modules are described herein.
As shown in fig. 8, in the same scanning period, the first latch sub-module and the second latch sub-module are respectively used for latching the data signals of two adjacent scanning lines. For example, during a period of scanning the nth row of pixel units, the first latching submodule is used for latching the data signals of the n+1th row of pixel units, and the second latching submodule is used for latching the data signals of the nth row of pixel units.
When the fifth switch submodule is in a conducting state, the first latch submodule can provide data signals for the second latch submodule, and after the data signals are sequentially transmitted to the level conversion module and the D/A module through the second latch submodule, gray scale signals converted by the D/A module can be transmitted to other switch submodules. The other sub-modules may perform odd-even column selection according to driving requirements so as to be able to transmit the gray scale signal to the selected odd columns OOP or even columns EOP. Then, the gray scale signal may be sequentially transferred to the data lines for providing the data signals to the corresponding odd columns or even columns through the amplifier and the second latch sub-module, and the corresponding pixel cells may be charged through the data lines. The pixel unit comprises a pixel electrode, and the process of charging the pixel unit mainly comprises the following steps: and a process of supplying a data signal to the pixel electrode and storing electric energy in the pixel electrode.
It should be noted that, for convenience of viewing, a schematic diagram of connection between the latch module for providing the data signal to the odd-numbered column pixel unit and the output buffer amplifier and connection between the latch module for providing the data signal to the even-numbered column pixel unit and the output buffer amplifier and connection between the latch module for providing the data signal to the odd-numbered column pixel unit and the output buffer amplifier and connection between the latch module for providing the data signal to the even-numbered column pixel unit and the output buffer amplifier are shown in fig. 8.
As shown in fig. 6 to 8, the method may include:
The display panel may include a plurality of pixel units arranged in an array, and the data lines may be used to supply data signals to the pixel units located in the same scan column, where the charged pixel units are pixel units in a scan line previous to the scan line in which the pixel units to be charged are located. Alternatively, the data line may be used to provide a data signal to the pixel cells located in the same scan line, where the charged pixel cells are the pixel cells in the previous scan column of the scan column in which the pixel cells to be charged are located.
Alternatively, this step 601 may be implemented by the acquisition module in fig. 8. The acquisition module is connected with the first latching submodule through the first switch submodule, after the first latching submodule receives the data signal, the data signal can be sent to the acquisition module, and the acquisition module can store the received data signal, so that the acquisition module can acquire the data signal to be charged and the charged data signal.
As shown in fig. 9, an implementation of this step 602 may include:
There is generally a correspondence between the data signal and the gray level, for example, when the gray level to be displayed by the pixel unit to be charged is 100, the pixel unit to be charged may be charged by using the data signal of 2.6 volts, so that the charged pixel unit can display the gray level 100.
In one implementation manner, after the acquiring module acquires the data signal, the acquiring module may convert the data signal into a gray level value according to a correspondence between the data signal and the gray level, and send the data signal and the gray level value corresponding to the data signal to the determining module. Therefore, the determining module can obtain the first display gray scale corresponding to the charged pixel unit and the second display gray scale corresponding to the pixel unit to be charged.
In another implementation manner, the acquiring module may send the data signal to the determining module, and the determining module may convert the data signal into the corresponding gray-scale value according to the corresponding relationship between the data signal and the gray-scale after receiving the data signal. Therefore, after the determining module obtains the charged data signal and the data signal to be charged, the determining module can obtain the first display gray scale corresponding to the charged pixel unit and the second display gray scale corresponding to the pixel unit to be charged.
This step 6022 may be implemented by a determination module. The compensation difference signal is determined according to the charged data signal and the data signal to be charged, and the pixel unit to be charged needs to be additionally charged. By performing compensation charging on the pixel unit to be charged by using the compensation difference signal, the pixel electrode can be charged to a desired target voltage as much as possible within the charging period of the pixel unit.
In one implementation, the display device may store a correspondence between gray-scale and difference signals. After the determining module obtains the gray level differences of the first display gray level and the second display gray level, whether the gray level differences are in the reference gray level difference range or not can be judged first, if the gray level differences are in the reference gray level difference range, the corresponding relation can be inquired according to the gray level differences, and the difference signal corresponding to the gray level differences is determined to be the compensation difference signal. The correspondence relationship may be stored in the determining module, or may be stored in another position of the display device, which is not specifically limited in the embodiment of the present invention.
Alternatively, the correspondence may be expressed as: if the gray level difference is within the reference gray level difference range, and when the gray level difference is within [8× (P-1) +1,8×p ], the compensation difference signal corresponding to the gray level difference is the superimposed signal of P compensation unit signals, where P is a positive integer. The magnitude of the compensation unit signal can be determined according to actual needs. For example, the compensation unit signal may be at a voltage of 0.1 volts, and the superimposed signal of the 5 compensation unit signals may be at a voltage of 0.5 volts.
The value range of the reference gray level difference range can be determined according to actual needs. For example, the gray level difference less than the lower limit of the reference gray level difference range may be a negative number, and the maximum value of the reference gray level difference range may be 255.
By way of example, assume that the compensation unit signal may be at a voltage of 0.1 volts. The corresponding relation between the gray scale and the difference signal may be shown in table 1, that is, when the gray scale is in the range of [1,8], the corresponding difference signal is 1 compensation unit signal, when the gray scale is in the range of [9,16], the corresponding difference signal is 2 compensation unit signals, and when the gray scale is in the range of [217,224], the corresponding difference signal is 28 compensation unit signals, so that when the gray scale difference is determined to be 10, the compensation difference signal corresponding to the data signal to be charged is a superposition signal of 2 compensation unit signals, that is, the compensation difference signal is a voltage of 0.2 volt. Or when the gray level difference is determined to be-10, the compensation difference signal corresponding to the data signal to be charged can be a superposition signal of-2 compensation unit signals, namely, the compensation difference signal is a voltage of-0.2 volt.
TABLE 1
| Gray scale range | Signal signal |
| [1,8] | 1 Compensation Unit Signal |
| [9,16] | 2 Compensation Unit signals |
| ...... | ...... |
| [217，224] | 28 compensation unit signals |
| [-224，-217] | -28 compensation unit signals |
| ...... | ...... |
| [-16，-9] | -2 compensation unit signals |
| [-8，-1] | -1 compensation unit signal |
And 603, determining the superposition signal of the compensation difference signal and the data signal to be charged as a compensation signal.
Alternatively, this step 603 may be implemented by a determination module. The compensation difference signal is a signal for additionally charging the pixel unit to be charged, and thus, a superimposed signal of the compensation difference signal and the data signal to be charged can be determined as a signal for compensating charging to the pixel unit to be charged in the compensation charging period.
For example, when the data signal is a voltage signal, assuming that the data signal to be charged v0=3 volts, the compensation signal v=v0+Δv=3.2 volts may be determined after the compensation difference signal Δv=0.2 volts is determined, and the compensation signal v=v0+Δv=2.8 volts may be determined after the compensation difference signal Δv= -0.2 volts is determined.
When the gray level difference is not within the reference gray level difference range, the reference signal may be directly determined as the compensation signal. For example, when the gray level difference is not within the reference gray level difference range, the determining module may send a feedback signal to the control module, and after receiving the feedback signal, the control module may control the pixel unit to be charged to be compensated and charged with the reference signal in the compensation charging process of the pixel unit to be charged.
The reference signal can be determined according to actual needs. For example, the reference signal may be a power supply signal for supplying power to the source driving circuit, and the power supply signal may include a high voltage power supply signal and a low voltage power supply signal. When the gray level difference is not in the reference gray level difference range, if the gray level difference is a negative value, the low voltage power supply signal can be determined as a compensation difference signal corresponding to the gray level difference, and if the gray level difference is a positive value, the high voltage power supply signal can be determined as a compensation difference signal corresponding to the gray level difference. Alternatively, the reference signal may be a voltage signal converted by the source driving circuit level converting circuit. For example, the reference signal may include a converted high voltage signal (e.g., 0.5 v) and a converted low voltage signal (e.g., -0.5 v), when the gray level difference is not within the reference gray level difference range, the low voltage signal may be determined as the compensation signal corresponding to the gray level difference if the gray level difference is negative, and the high voltage signal may be determined as the compensation signal corresponding to the gray level difference if the gray level difference is positive. The magnitudes of the high voltage power supply signal, the low voltage power supply signal, the high voltage signal and the low voltage signal can be determined according to actual needs, for example, the high voltage power supply signal can be 0.2 volt, 5 volt or 5.5 volt, the low voltage power supply signal can be-0.2 volt, -5 volt or-5.5 volt, the high voltage signal can be 0.5 volt and the low voltage signal can be-0.5 volt, and the embodiment of the invention does not limit the invention.
This step 604 may be implemented by a control module. The control module may charge the pixel cell to be charged in the compensation charging period after determining the compensation charging period in control to employ the compensation signal so as to be able to charge the pixel cell to the target voltage within the charging period of the pixel cell. The implementation manner of the step 604 may be various, and the following two implementation manners are taken as examples in the embodiment of the present invention, which are described below:
in a first implementation, as shown in fig. 10, the implementation process may include:
in step 6041a, determining a target display area where the pixel unit to be charged is located, the display panel includes: and N display partitions arranged from near to far to a data signal end, wherein the data signal end is used for providing data signals to a plurality of pixel units, and N is a positive integer greater than 1.
Alternatively, the data signal terminal may be located at one end of the display panel. At this time, the distances from the pixel units at different positions in the display panel to the data signal end are different, so that transmission loss of different degrees occurs in the process of transmitting the data signal from the data signal end to different pixel units, that is, the data signal charged to the pixel unit is attenuated to different degrees compared with the signal output by the data signal end. At this time, if the pixel units at different positions are compensated for charging in the same time period, there still exist pixel units with insufficient charging. Therefore, the compensation charging period of the pixel units can be determined according to the distance from the pixel units to the data signal end, so that the pixel units in the display panel can reach the charging requirement as much as possible, and the display effect of the display panel is further ensured.
The display panel may comprise a plurality of display segments, in which case the distance from the pixel element to the data signal terminal may be characterized by the distance from the display segment in which the pixel element is located to the data signal terminal. And the display partitions in the display panel can be divided according to the fineness degree of the display screen which is expected to be achieved, and the size of the display partitions can be determined according to the fineness degree. When the display panel is partitioned, the display panel can be divided into N display partitions according to the size of the display partition and the distance from the pixel unit to the data signal end, and the position information of each display partition is recorded. When the step 6041a is performed, the target position information of the pixel unit to be charged in the display panel may be acquired, and then the target position information is compared with the position information of the N display areas to determine the target display area where the pixel unit to be charged is located.
After dividing the display panel into N display partitions, the N display partitions may be ordered in order from near to far to the data signal end to obtain an order of each display partition in the ordering. Correspondingly, after determining the target display partition where the pixel unit to be charged is located, the order of the target display partition in the N display partitions arranged in sequence can be determined.
In addition, in order to further improve the charging effect of the pixel unit, the pixel unit to be charged can be compensated and charged by using the compensation signal in the charging period of the pixel unit, and then the pixel unit to be charged is charged by using the data signal to be charged, so that the charging process of the pixel unit to be charged can be stopped as required when the charging period is finished. At this time, in order to reserve the duration of charging the pixel unit to be charged with the data signal to be charged in the charging period of the pixel unit, the duration of the compensation period of the pixel unit nearest to the data signal end may be 0. Accordingly, when the display sections are ordered by distance to the data signal end, the order of the pixel units nearest to the data signal end may be determined as 0, i.e., ordered from 0.
For example, fig. 11 is a schematic diagram of a display panel according to an embodiment of the present invention, where the display panel is divided into 25 display partitions, distances from the 25 display partitions to the data signal end are different, and after the display partitions are ordered according to the distances from the data signal end, an order of each display partition in the 25 display partitions is shown by a reference numeral in the display partition in fig. 11, that is, a smaller number of the reference numeral of the display partition indicates that the closer the distance from the display partition to the data signal end is, and an order of the display partition in the 25 display partitions arranged in sequence is forward. After determining that the target display area in which the pixel unit to be charged is located is the pixel unit in the upper left corner of the display panel, the order of the pixel unit to be charged in the 25 display areas may be determined to be 15 according to the reference numerals shown in fig. 11. Wherein, the reference numerals of different display partitions are the same, which means that the order of the different display partitions in the 25 display partitions is the same, that is, the distances from the different display partitions to the data signal end are the same.
Since the attenuation degree of the data signal for charging the pixel unit is inversely related to the distance from the pixel unit to the data signal end, the compensation charging degree for different pixel units is positively related to the distance. The extent of the compensation charging of the pixel cell may be characterized by the duration of the compensation charging of the pixel cell, and therefore the duration of the compensation charging period of the pixel cell should be positively correlated with the distance. By carrying out compensation charging on different pixel units according to the distances from the pixel units to the data signal end, the pixel units positioned at the far end can achieve a charging effect, and the pixel units positioned at the near end can be ensured not to be overcharged. Also, to ensure that the charging process of the pixel cell to be charged can be stopped as desired at the end of the charging period, the start of the charging period may be determined as the start of the compensation charging period.
Alternatively, the positive correlation of the time length t of the time length of the compensation charging period and the distance s may be represented by the order n. For example, when the order of the pixel units nearest to the data signal terminal is 0, the relationship may be expressed as t= [ (t 1-t 2) ×n ]/N. The N is the total number of display partitions in the display panel. The t1 is the total time period for charging the pixel cell. t2 is the duration of charge retention of the pixel electrode in the pixel unit under the action of charge retention and the like. The (t 1-t 2) indicates a period of time during which the data signal at the effective potential is supplied to the pixel unit, i.e., a period of time during which the pixel unit is charged.
For example, assuming that the total number N of display sections in the display panel is 16, the order N of the target display sections in which the pixel units to be charged are located is 15, and the duration (t 1-t 2) of the charging period of the pixel units is 4 microseconds, the duration t= [4×15 ]/16=3.75 microseconds of the compensation charging period.
Alternatively, the duration control of the compensation charging period may be implemented by a register. For example, the register may store the correspondence between the order corresponding to the pixel units to be charged and the duration of the compensation charging period, and the correspondence between the different orders and the duration may be represented by the numerical value of the register, when the control module determines the duration corresponding to the pixel units to be charged, the register may be queried according to the order corresponding to the pixel units to be charged, so as to obtain the numerical value corresponding to the pixel units to be charged, and then in step 605, the compensation charging is performed on the pixel units to be charged according to the numerical control.
For example, when the display panel includes 25 display partitions, the 25 display partitions correspond to 16 orders, the duration of the compensated charging period may be controlled by a 4-bit register, and at this time, the corresponding relationship between the values of the register, the order of the display partitions and the duration of the compensated charging period is shown in table 2 below. When the corresponding order of the pixel units to be charged is 15, the register is queried to obtain the value 1111 corresponding to the pixel units to be charged, and then in step 605, the pixel units to be charged are controlled to be compensated and charged according to the value 1111.
TABLE 2
| Numerical value | Order of the | Duration of time | Numerical value | Order of the | Duration of time |
| 0000 | 0 | 0 | 1000 | 8 | (t1-t2)8/16 |
| 0001 | 1 | (t1-t2)/16 | 1001 | 9 | (t1-t2)9/16 |
| 0010 | 2 | (t1-t2)2/16 | 1010 | 10 | (t1-t2)10/16 |
| 0011 | 3 | (t1-t2)3/16 | 1011 | 11 | (t1-t2)11/16 |
| 0100 | 4 | (t1-t2)4/16 | 1100 | 12 | (t1-t2)12/16 |
| 0101 | 5 | (t1-t2)5/16 | 1101 | 13 | (t1-t2)13/16 |
| 0110 | 6 | (t1-t2)6/16 | 1110 | 14 | (t1-t2)14/16 |
| 0111 | 7 | (t1-t2)7/16 | 1111 | 15 | (t1-t2)15/16 |
In a second implementation, as shown in fig. 12, the implementation process may include:
Because the distance from the pixel unit to the data signal end is different, the data signal for charging the pixel unit is attenuated to a different degree compared with the signal output by the data signal end. Therefore, it is necessary to determine the compensation charging period of the pixel unit according to the distance from the pixel unit to the data signal terminal.
Alternatively, the first target distance may be a straight line distance between the pixel unit and the data signal end, or may be a length of a data line connecting the pixel unit and the data signal end, which is not specifically limited in the embodiment of the present invention. Because the attenuation of the data signal in the transmission process is mainly caused by the voltage drop of the data line, when the first target distance is the length of the data line connecting the pixel unit and the data signal end, the compensation charging period determined according to the first target distance can more accurately compensate for the charging deficiency caused by the attenuation of the data signal, and the charging effect on the pixel unit can be further ensured.
Since the degree of compensation charging of the pixel cells is positively correlated with the distance of the pixel cells from the data signal terminal. And the degree of the compensation charging of the pixel unit can be characterized by the compensation charging time period for charging the pixel unit, namely, the degree of the compensation charging of the pixel unit is positively correlated with the compensation charging time period for charging the pixel unit. Therefore, the time period for performing the compensation charging on the pixel unit to be charged can be determined according to the first ratio.
Alternatively, the length of the compensation charging period and the first ratio may be in a positive correlation relationship. For example, when a period of time for charging the pixel unit to be charged with the data signal to be charged is reserved in the charging period of the pixel unit, the relationship between the period of time t of the compensated charging period and the first ratio m1 may be expressed as: t= (t 1-t 2) × (m 1-m 2). The t1 is the total time period for charging the pixel cell. The t2 is a period of time during which the pixel electrode in the pixel unit performs charge retention under the effect of charge retention and the like. The m2 is the ratio of the distance from the nearest pixel unit to the data signal end to the second target distance. Also, to further improve the charging effect of charging the pixel unit, the start point of the charging period may be determined as the start point of the compensation charging period.
It should be noted that, in the second implementation manner, the length of the compensation charging period is determined according to the distance from the pixel unit to be charged to the data signal end, so that the division granularity is finer when the length of the compensation charging period is determined, thereby realizing finer adjustment of the charging effect and further ensuring the display effect of the display panel.
In the charging period of the pixel unit to be charged, the pixel unit to be charged is compensated and charged by using the compensation signal, and then the pixel unit to be charged is charged by using the data signal to be charged, so that the charging process of the pixel unit to be charged can be stopped as expected when the charging period is finished.
Fig. 13 is a timing chart illustrating charging of pixel units of two adjacent scan lines by using the charging method according to the embodiment of the present invention. As shown in fig. 13, for the pixel unit to be charged in the nth scan line, since the gray level difference of the pixel unit is positive, the compensation difference signal of the pixel unit is positive, and the compensation signal V12 of the pixel unit is greater than the data signal V11 to be charged of the pixel unit. For the pixel unit to be charged in the n+1th scan line, since the gray level difference of the pixel unit is negative, the compensation difference signal of the pixel unit is negative, and the compensation signal V22 of the pixel unit is smaller than the data signal V21 to be charged of the pixel unit. And the pixel units to be charged in the N scanning line are subjected to compensation charging in the compensation charging period tb1 by adopting the compensation signal V12 in turn, the pixel units to be charged in the N scanning line are subjected to charging in other charging periods tq1 by adopting the data signal V11 to be charged, and the duration of the compensation charging period tb1 and the duration of the other charging periods tq1 and the duration tN of the charging period of the pixel units to be charged in the N scanning line are equal. And the pixel units to be charged in the n+1th scanning line are compensated and charged in the compensation charging period tb2 by using the compensation signal V22, the pixel units to be charged in the n+1th scanning line are charged in the other charging period tq2 by using the data signal V21 to be charged, and the duration of the compensation charging period tb2 and the duration t (n+1) of the charging period of the pixel units to be charged in the n+1th scanning line are equal to the duration t (n+1) of the other charging period tq2, where LD is a signal provided by the enable signal terminal to the control module in fig. 13.
In the charging process of the pixel unit of the nth scanning line, the schematic diagram of the voltage waveform of the pixel electrode in the pixel unit is shown in fig. 14, and comparing fig. 14 with fig. 4, it can be found that the slope of the waveform in the period t3 in fig. 14 is larger than the slope of the waveform in the period t3 in fig. 4, so that the charging method provided by the embodiment of the invention can obviously reduce the charging delay time, improve the charging rate of the pixel unit, and enable the pixel unit to be charged to the desired target voltage as much as possible in the charging period of the pixel unit.
The following principle of implementing the above steps 601 to 605 by the respective modules in fig. 8 is as follows:
as shown in fig. 8, the control module is further connected to the enable signal terminal E, and when the enable signal terminal provides a low level signal, the control module does not operate, and in fig. 8, the fifth switch submodule is turned on, and at this time, the data signal may charge the pixel unit through the first latch submodule, the fifth switch submodule, the second latch submodule, and the like, and all the switch submodules except for the fifth switch submodule are in an off state.
When the enabling signal terminal provides a high-level signal, the control module works, and the corresponding switch submodule can be controlled to be conducted according to different requirements through the control module. In step 601, the control module may control the first switch sub-module to be turned on, so that the first latch sub-module may send the data signal to the acquisition module through the first switch sub-module. Thus, in step 602, the determining module can be enabled to determine the compensation difference signal according to the charged data signal and the data signal to be charged, and further determine the compensation signal of the pixel unit to be charged in step 603. After determining the compensation charging period by the control module in step 604, if the gray level difference is within the reference gray level difference range, in step 605, the control module controls the fifth switch sub-module to be turned off in the compensation charging period, controls the second switch sub-module to be turned on in the compensation charging period, and provides the compensation signal to the second latch sub-module through the compensation signal, and provides the compensation signal to the output end of the source driving circuit through the second latch sub-module and the level conversion module, etc., so as to provide the compensation signal to the pixel unit to be charged. Or if the gray level difference is not within the reference gray level difference range, when the compensation signal is determined to be the high voltage power signal for supplying power to the source driving circuit, in step 605, the control module may control the fourth switch sub-module to be turned on during the compensation charging period and provide the high voltage power signal to the output terminal of the source driving circuit so as to provide the high voltage power signal to the pixel unit to be charged. Then after the compensation charging period is finished, the control module controls the second switch sub-module (or the fourth switch sub-module) to be closed and controls the fifth switch sub-module to be turned on, at this time, the data signal to be charged can be output to the output end of the source driving circuit by the first latch sub-module through the fifth switch sub-module, the second latch sub-module and the like so as to provide the data signal to be charged for the pixel unit to be charged.
In summary, according to the method for charging the pixel unit provided by the embodiment of the invention, by determining the compensation signal for charging the pixel unit to be charged, the pixel unit to be charged is charged in the compensation charging period by adopting the compensation signal, and the compensation charging period is located in the charging period of the pixel unit.
It should be noted that, the sequence of the steps of the charging method for the pixel unit provided in the embodiment of the present invention may be appropriately adjusted, the steps may also be increased or decreased accordingly according to the situation, and any method that is easily conceivable to be changed by those skilled in the art within the technical scope of the present application should be covered within the protection scope of the present application, so that no further description is provided.
An embodiment of the present invention provides a charging device for a pixel unit, as shown in fig. 15, the device 900 may include:
the acquiring module 901 is configured to acquire a data signal to be charged for charging a pixel unit to be charged, and a data signal to be charged for charging a pixel unit to be charged, where the pixel unit to be charged and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in the display panel.
A determining module 902 is configured to determine a compensation signal for charging the pixel unit to be charged based on the charged data signal and the data signal to be charged.
The control module 903 is configured to control charging of the pixel unit to be charged in a compensation charging period by using the compensation signal, where the compensation charging period is located in the charging period of the pixel unit.
In summary, according to the charging device for the pixel unit provided by the embodiment of the invention, the determining module determines the compensation signal for charging the pixel unit to be charged, the control module charges the pixel unit to be charged in the compensation charging period by adopting the compensation signal, and the compensation charging period is located in the charging period of the pixel unit.
Alternatively, as shown in fig. 16, the determining module 902 may include:
the first determining submodule 9021 is configured to determine a compensation difference signal based on the charged data signal and the data signal to be charged.
The second determining submodule 9022 is configured to determine a superimposed signal of the compensation difference signal and the data signal to be charged as a compensation signal.
Optionally, the first determining submodule 9021 is configured to:
based on the charged data signal, a first display gray scale displayed by the charged pixel unit under the drive of the charged data signal is obtained.
And acquiring a second display gray scale displayed by the pixel unit to be charged under the drive of the charged data signal based on the data signal to be charged.
A compensation difference signal is determined based on a gray level difference of the first display gray level and the second display gray level.
Optionally, the first determining submodule 9021 is configured to:
if the gray level difference is within the reference gray level difference range, and when the gray level difference is within [8× (P-1) +1,8×p ], the superimposed signal of the P compensation unit signals is determined as the compensation difference signal, and P is a positive integer.
Optionally, the display panel includes a plurality of pixel units arranged in an array, the data lines are used for providing data signals for the pixel units located in the same scanning column, and the charged pixel units are pixel units in a scanning line previous to the scanning line where the pixel units to be charged are located.
Optionally, the determining module 902 is further configured to:
determining a target display partition where a pixel unit to be charged is located, wherein the display panel comprises: the data signal end is used for providing data signals to the pixel units according to N display partitions which are arranged from near to far to the data signal end, and N is a positive integer greater than 1.
The order of the target display partition among the N display partitions arranged in sequence is determined.
Based on the order and the duration of the charging period, the duration of the compensated charging period is determined, and the start of the charging period is determined as the start of the compensated charging period.
Optionally, the charging period of the pixel unit further includes: other charging periods, the control module 903 is also configured to: and charging the pixel units to be charged in other charging periods by adopting the data signals to be charged.
In summary, according to the charging device for the pixel unit provided by the embodiment of the invention, the determining module determines the compensation signal for charging the pixel unit to be charged, the control module charges the pixel unit to be charged in the compensation charging period by adopting the compensation signal, and the compensation charging period is located in the charging period of the pixel unit.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and modules described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
The embodiment of the invention also provides a display device, which comprises: the charging device for the pixel unit provided by the embodiment of the invention.
The embodiment of the invention also provides a storage medium, which can be a nonvolatile computer readable storage medium, and when instructions in the storage medium are executed by a processor of a terminal, the terminal can execute the method for charging the pixel unit.
The embodiment of the invention also provides a computer program product containing instructions, which when run on a computer, cause the computer to execute the method for charging the pixel unit provided by the embodiment of the invention.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The foregoing description of the exemplary embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (6)
1. A method of charging a pixel cell, the method comprising:
acquiring a data signal to be charged for charging a pixel unit to be charged and a data signal to be charged for charging a pixel unit to be charged, wherein the pixel unit to be charged and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in a display panel;
acquiring a first display gray scale displayed by the charged pixel unit under the drive of the charged data signal based on the charged data signal;
acquiring a second display gray scale displayed by the pixel unit to be charged under the drive of the charged data signal based on the data signal to be charged;
determining a compensation difference signal based on a gray level difference of the first display gray level and the second display gray level;
determining the superposition signal of the compensation difference signal and the data signal to be charged as a compensation signal;
charging the pixel unit to be charged in a compensation charging period by adopting the compensation signal, wherein the compensation charging period is positioned in the charging period of the pixel unit;
Before said charging of said pixel cell to be charged with said compensation signal during a compensation charging period, said method further comprises:
determining a target display partition where the pixel unit to be charged is located, wherein the display panel comprises: n display partitions which are arranged from near to far to a data signal end, wherein the data signal end is used for providing data signals for the pixel units, and N is a positive integer greater than 1;
determining the order of the target display partition in N display partitions which are arranged in sequence;
determining the duration of the compensation charging period based on the sequence and the duration of the charging period, determining the starting point of the charging period as the starting point of the compensation charging period, and when the sequence of the pixel units nearest to the data signal end is 0, the duration of the compensation charging period of the pixel units meets t= [ (t 1-t 2) x N ]/N, wherein t is the duration of the compensation charging period, and (t 1-t 2) is the duration of the charging period, and N is the sequence;
the determining a compensation difference signal based on a gray level difference of the first display gray level and the second display gray level includes:
if the gray level difference is within a reference gray level difference range, and when the gray level difference is within [8× (P-1) +1,8×p ], determining a superimposed signal of P compensation unit signals as the compensation difference signal, wherein P is a positive integer;
The charging the pixel unit to be charged in the compensation charging period by adopting the compensation signal comprises the following steps:
charging the pixel units to be charged of one scanning line in a compensation charging period by adopting the compensation signal, and charging the pixel units to be charged of the one scanning line in other charging periods by adopting a data signal to be charged, wherein the sum of the time durations of the compensation charging period and the other charging periods is equal to the time duration of the charging period of the pixel units to be charged of the one scanning line;
when the gray level difference of the pixel units to be charged in the one scanning line is a positive value, the compensation difference signal of the pixel units to be charged in the one scanning line is a positive value, and the compensation signal of the pixel units to be charged in the one scanning line is larger than the data signals to be charged in the pixel units to be charged in the one scanning line; for the pixel units to be charged of the next scanning line, when the gray level difference of the pixel units to be charged of the next scanning line is a negative value and the compensation difference signal of the pixel units to be charged of the next scanning line is a negative value, the compensation signal of the pixel units to be charged of the next scanning line is smaller than the data signals to be charged of the pixel units to be charged of the next scanning line.
2. The method of claim 1, wherein the display panel includes a plurality of pixel cells arranged in an array, the data lines are configured to provide data signals to pixel cells located in a same scan column, and the charged pixel cells are pixel cells in a scan line preceding the scan line in which the pixel cells to be charged are located.
3. The method according to claim 1 or 2, wherein the charging period of the pixel cell further comprises: other charging periods, after said charging the pixel cell to be charged with the compensation signal in a compensation charging period, the method further comprises:
and charging the pixel unit to be charged in the other charging time periods by adopting the data signal to be charged.
4. A charging device for a pixel cell, the device comprising:
the device comprises an acquisition module, a display module and a charging module, wherein the acquisition module is used for acquiring a data signal to be charged for charging a pixel unit to be charged and a data signal to be charged for charging a pixel unit to be charged, the charged pixel unit and the pixel unit to be charged are provided with data signals by the same data line, and the pixel unit to be charged is any one of a plurality of pixel units in the display panel;
The determining module is used for acquiring a first display gray scale displayed by the charged pixel unit under the drive of the charged data signal based on the charged data signal; acquiring a second display gray scale displayed by the pixel unit to be charged under the drive of the charged data signal based on the data signal to be charged; determining a compensation difference signal based on a gray level difference of the first display gray level and the second display gray level; determining the superposition signal of the compensation difference signal and the data signal to be charged as a compensation signal, and determining the superposition signal of P compensation unit signals as the compensation difference signal when the gray level difference is within the range of the reference gray level difference and the gray level difference is within [8× (P-1) +1,8×p ], wherein P is a positive integer;
the control module is used for controlling the pixel unit to be charged in a compensation charging period by adopting the compensation signal, and the compensation charging period is positioned in the charging period of the pixel unit;
the determining module is further configured to:
determining a target display partition where the pixel unit to be charged is located, wherein the display panel comprises: n display partitions which are arranged from near to far to a data signal end, wherein the data signal end is used for providing data signals for the pixel units, and N is a positive integer greater than 1;
Determining the order of the target display partition in N display partitions which are arranged in sequence;
determining the duration of the compensation charging period based on the sequence and the duration of the charging period, determining the starting point of the charging period as the starting point of the compensation charging period, and when the sequence of the pixel units nearest to the data signal end is 0, the duration of the compensation charging period of the pixel units meets t= [ (t 1-t 2) x N ]/N, wherein t is the duration of the compensation charging period, and (t 1-t 2) is the duration of the charging period, and N is the sequence;
the control module is further configured to:
charging the pixel units to be charged of one scanning line in a compensation charging period by adopting the compensation signal, and charging the pixel units to be charged of the one scanning line in other charging periods by adopting a data signal to be charged, wherein the sum of the time durations of the compensation charging period and the other charging periods is equal to the time duration of the charging period of the pixel units to be charged of the one scanning line;
when the gray level difference of the pixel units to be charged in the one scanning line is a positive value, the compensation difference signal of the pixel units to be charged in the one scanning line is a positive value, and the compensation signal of the pixel units to be charged in the one scanning line is larger than the data signals to be charged in the pixel units to be charged in the one scanning line; for the pixel units to be charged of the next scanning line, when the gray level difference of the pixel units to be charged of the next scanning line is a negative value and the compensation difference signal of the pixel units to be charged of the next scanning line is a negative value, the compensation signal of the pixel units to be charged of the next scanning line is smaller than the data signals to be charged of the pixel units to be charged of the next scanning line.
5. The apparatus of claim 4, wherein the charging period of the pixel cell further comprises: and the control module is further used for controlling the data signal to be charged to charge the pixel unit to be charged in the other charging period after controlling the pixel unit to be charged in the compensation charging period by adopting the compensation signal.
6. A display device, characterized in that the display device comprises: a charging device for a pixel cell according to claim 4 or 5.
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| WO2022099676A1 (en) * | 2020-11-16 | 2022-05-19 | 京东方科技集团股份有限公司 | Data processing method and apparatus, driver and display apparatus |
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