CN115985235A - LED driving circuit, driving method and display device - Google Patents
LED driving circuit, driving method and display device Download PDFInfo
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Abstract
The invention provides an LED drive circuit, a drive method and a display device, wherein the LED drive circuit comprises: a row driver circuit to provide a plurality of scan signals to the LED array based on a plurality of row channels; the column driving circuit provides a plurality of constant current driving signals for the LED array based on a plurality of column channels, wherein in the effective period of each scanning signal, the plurality of column channels are configured to be opened in a time-sharing mode, so that the plurality of constant current driving signals are provided to the LED array in a time-sharing mode. According to the invention, different opening positions are configured for a plurality of output channels of the driving chip, so that the coupling interference phenomenon among the channels is reduced, the power supply ripple is reduced, and the display effect and the display quality are improved.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to an LED driving circuit, a driving method and a display device.
Background
The LED display screen is a modern information publishing platform formed by utilizing LED display screen unit boards, is gradually accepted by the market by virtue of the advantages of high luminous efficiency, long service life, flexible configuration, rich colors, strong outdoor environment adaptability and the like, particularly the development of full-color LED display screens is particularly rapid, and the LED display screen is widely applied to the fields of traffic electronic identification, urban media and the like.
Along with the development of the technology, the functions of the driving chips in the LED display screen are increased, the number of rows of pixels scanned at one time is increased, and the distance between the lamp beads is reduced. Along with lamp pearl quantity is more and more on the display module assembly, on the booth apart from the LED display screen, the coupling phenomenon between the different lamp pearls is more obvious. In order to eliminate the coupling phenomenon, the conventional solution is to add a function on the driver chip by the driver IC manufacturer, that is, based on the starting position of the driver chip at which each output channel is simultaneously opened, different opening times are set for the RGB (red, green, blue) channels of the driver chip, so as to reduce the influence of the channel opening on the line voltage and improve the display effect. However, the solution has no effect on decoupling between lamp beads of the same color, and the display effect of a part of the lamp beads in the display screen is still interfered, as shown in fig. 1, the gray scale of a part of the lamp beads in the display screen (e.g., a part of the lamp beads in the region indicated by the arrow) is still affected by the bright blocks or the dark blocks in the same row, so that the gray scale deviates from the original gray scale.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
In order to solve the technical problems, the invention provides an LED driving circuit, a driving method and a display device, which can solve the technical problem that coupling interference between different channels affects the display effect.
According to a first aspect of the present invention, there is provided an LED driving circuit for driving an LED array, the LED driving circuit comprising:
a row driving circuit providing a plurality of scanning signals to the LED array based on a plurality of row channels;
a column drive circuit to provide a plurality of constant current drive signals to the LED array based on a plurality of column channels,
wherein, in an active period of each scan signal, the plurality of column channels are configured to be time-divisionally turned on, so that the plurality of constant current driving signals are time-divisionally provided to the LED array.
Optionally, the plurality of column channels are configured to be sequentially turned on in the order of arrangement.
Optionally, the plurality of column channels are configured to be randomly time-shared on.
Optionally, the opening intervals of the plurality of column channels are the same; alternatively, the open intervals of the plurality of column channels are at least partially different.
Optionally, the column driving circuit comprises:
a control unit providing a plurality of control signals according to a display image;
a plurality of switches respectively arranged on the plurality of column channels, the plurality of switches being used for controlling the opening conditions of the plurality of column channels according to the plurality of control signals,
wherein the plurality of control signals are configured to control the plurality of column channels to be turned on time-divisionally by controlling the plurality of switches to be turned on time-divisionally.
Optionally, the control unit is further configured to provide a plurality of adjustment signals to adjust the potential of the corresponding column channel to the initial potential before each column channel is turned on,
wherein the plurality of adjustment signals are configured to be supplied to the plurality of column channels in a time-sharing manner so that timings of adjusting the potentials of the plurality of column channels to initial potentials are synchronized with turn-on timings of the corresponding column channels.
According to a second aspect of the present invention, there is provided a display device comprising:
a display panel; and
the LED driving circuit as described above, for providing a plurality of scan signals and a plurality of constant current driving signals to drive the display panel.
Optionally, the display panel includes an LED display panel, an AMOLED display panel, a micro LED display panel, or a MiniLED display panel.
According to a third aspect of the present invention, there is provided an LED driving method for driving an LED array connected with a plurality of row channels and a plurality of column channels, the LED driving method comprising:
generating gray scale data according to the display image;
generating a plurality of constant current driving signals according to the gray scale data;
and controlling the plurality of column channels to be switched on in a time-sharing manner during the switching-on period of each row channel in the plurality of row channels, and supplying the plurality of constant current driving signals to the LED array in a time-sharing manner.
Optionally, the LED driving method further includes:
providing a plurality of adjustment signals to the plurality of column channels in time division to adjust the potential of the corresponding column channel to an initial potential before each column channel is turned on,
and adjusting the electric potentials of the plurality of column channels to initial electric potentials at the same time as the opening time of the corresponding column channel.
The beneficial effects of the invention at least comprise:
the embodiment of the invention controls the plurality of row channels to be opened in a time-sharing manner, avoids the mutual influence among the row channels, solves the color cast problem caused by the interference of high and low gray scales, simultaneously reduces the instantaneous current consumption to the power supply, reduces the power supply ripple, improves the display effect and the display quality, and is beneficial to improving the resistance of the system to electromagnetic interference.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
FIG. 1 is a diagram illustrating the display effect of a conventional display device after high-low gray scale coupling occurs;
FIG. 2 is a schematic diagram showing a theoretical waveform of a conventional LED driving circuit when a part of column channels are turned on;
FIG. 3 is a diagram showing an actual waveform of a conventional LED driving circuit when some column channels are turned on;
fig. 4 is a schematic structural diagram illustrating a display device according to an embodiment of the present invention;
FIG. 5 is a waveform diagram illustrating a portion of column channels being turned on at different times according to an embodiment of the present invention;
fig. 6 is a flow chart illustrating a method for driving an LED according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to FIGS. 2 and 3, the prior artIn the example of driving the LED arrays in M rows and N columns (M and N are both positive integers greater than 1), each column channel is turned on once during the turn-on period of each row channel so as to provide a constant current driving signal to the corresponding LED bead, and the turn-on time of each column channel is the same, for example, during the turn-on period of the j-1 th row channel Line (j-1) (i.e., the effective period of the j-1 th Scan Line (Scan Line), corresponding to the time periods t11 to t13, where j is a positive integer, and j is greater than 1 and less than or equal to M), each column channel is turned on at the time t 12. Theoretically, the effective time (or duty ratio) of the control signal for controlling the opening time of each column channel during the opening period of the row channel can be set, so that the corresponding LED lamp beads can be lightened to the required gray scale. For example, the control signal Col is set k When the effective time during the opening period of the j-1 th row channel is smaller T1 (wherein k is a positive integer, and j is greater than or equal to 1 and less than or equal to N), the LED lamp beads corresponding to the j-1 th row and the k column can be lightened to a darker low gray scale; and sets the control signal Col k+1 The effective time during the opening period of the j-1 th row channel is larger T2, and the LED lamp beads corresponding to the (k + 1) th row of the j-1 th row can be lightened to a brighter high gray scale.
However, referring to fig. 3, taking an example at time t12, the plurality of column channels that are simultaneously turned on are prone to cause large instantaneous current consumption on the power PWO, which results in power supply ripples, and the power supply ripples may also act on each column channel at the same time, at this time, for the column channel corresponding to the LED lamp bead with low gray scale (for example, the LED lamp bead corresponding to the kth column of the j-1 th row), because the turn-on time of the column channel is small, the luminance loss is large under the influence of the power supply ripples. In addition, the traditional low-gray-scale LED lamp beads are affected by a large proportion when being interfered by adjacent bright and dark blocks, so that the color cast problem of the traditional low-gray-scale LED lamp beads is easy to occur.
In view of the above problems, an embodiment of the present invention discloses a display device, which controls a plurality of row channels in the display device to be turned on in a time-sharing manner, avoids mutual influence among the row channels, solves the color cast problem caused by interference of high and low gray scales, and simultaneously reduces instantaneous current consumption of a power supply, reduces power supply ripples, and improves display effect and display quality.
As shown in fig. 4, the display device disclosed in the embodiment of the present invention includes: a display panel 130 and an LED driving circuit. The LED driving circuit is used to provide a plurality of scan signals and a plurality of constant current driving signals to drive the display panel 130.
In this embodiment, the display panel 130 is provided with M rows by N columns of LED arrays, and the LED arrays include a plurality of LED lamp beads D arranged in rows and columns 11 ~D MN M and N are positive integers greater than 1. Each LED lamp bead comprises an anode and a cathode, and the LED lamp beads are lightened when forward voltage or current is applied between the anode and the cathode of the LED lamp beads. Anodes of multiple LED beads in the same row are commonly connected to the same row line, e.g., LED bead D in the first row 11 ~D 1N Are commonly connected to row line G1. The cathodes of multiple LED beads in the same row are connected to the same row line, for example, LED bead D in the first row 11 ~D M1 Are commonly connected to the column line S1.
In the display panel 130, a plurality of LED lamp beads D 11 ~D MN Respectively as pixel cells. It is understood that each pixel in the display panel 130 may include one or more pixel units. For example, when displaying a color image, three LED lamp beads may be used to respectively display red, green, and blue (RGB) color components, where each LED lamp bead generates light of a corresponding color according to its own light emitting characteristics, or an additional optical filter is used to generate light of a corresponding color.
Illustratively, the display panel 130 includes an LED (Light Emitting Diode) display panel, an AMOLED (Active-matrix organic Light Emitting Diode) display panel, a micro LED display panel, or a MiniLED display panel.
The LED drive circuit includes: a row driver circuit 110 and a column driver circuit 120.
The row driving circuit 110 provides a plurality of scan signals to the LED array based on a plurality of row channels.
The row driving circuit 110 is connected to a plurality of row lines G1 to GM. The column driving circuit 110 includes a plurality of first switches Q11-Q1M connected to one of the column lines, and each first switch and the column line connected thereto form a column channel. The row driving circuit 110 controls the on (or off) of a plurality of row channels by controlling the on (or off) of a plurality of first switches Q11 to Q1M, and provides a power supply voltage VCC to the anode of the LED lamp bead connected to the corresponding row line when the row channel is on.
The column drive circuit 120 provides a plurality of constant current drive signals to the LED array based on a plurality of column channels.
The column driving circuit 120 is connected to a plurality of column lines S1 to SN. The column driving circuit 120 includes a control unit 121, a plurality of second switches Q21 to Q2N and a plurality of constant current sources I1 to IN, the plurality of second switches Q21 to Q2N and the plurality of constant current sources I1 to IN are respectively connected to one of the plurality of column lines, and each second switch and the column line connected thereto form a column channel. The control unit 121 provides a plurality of control signals Col according to the display image 1 ~Col N A plurality of second switches Q21-Q2N according to the plurality of control signals Col 1 ~Col N Controlling the opening of a plurality of column channels. During the display of the dynamic image on the display panel 130, the row driving circuit 110 scans row by row, for example, and sequentially connects the row lines to a high level (e.g., the power supply voltage VCC). Accordingly, the plurality of constant current sources in the column driving circuit 120 apply constant currents to the plurality of LED lamp beads of the row, respectively. The column driving circuit 120 controls a plurality of control signals Col according to the gray scale data of the corresponding row of the image 1 ~Col N The duty ratio of the LED lamp beads is adjusted, so that the effective lighting time of the LED lamp beads on the corresponding row is changed, the brightness of the LED lamp beads is adjusted, and the display of images is realized.
In the present embodiment, during the active period of each scan signal, i.e., during each row channel being turned on, the plurality of column channels are configured to be turned on time-divisionally, so that the plurality of constant current driving signals are supplied to the LED array time-divisionally. In particular, a plurality of control signals Col may be configured 1 ~Col N So that the plurality of control signals Col 1 ~Col N The timing of changing from the invalid state to the valid state differs for each valid period of the scanning signal, thereby using a plurality of control signals Col 1 ~Col N Controlling a plurality of second switchesQ21-Q2N are conducted in time-sharing manner to control the multiple row channels to be opened in time-sharing manner.
Illustratively, as shown in fig. 5, the control signals Col corresponding to two adjacent column channels k And Col k+1 For example, among others, the control signal Col k For the control signal of the second switch Q2k in the kth column channel, control signal Col k+1 Is the control signal for the second switch Q2 (k + 1) in the (k + 1) th column channel. In the effective period of a certain scanning signal, the anodes of the LED lamp beads in the corresponding row are connected with the power supply end, and the control signal Col k Switching from the inactive state to the active state at time t21, thereby controlling the second switch Q2k to be turned on at time t 21; control signal Col k+1 And switching from the inactive state to the active state at time t22, thereby controlling the second switch Q2 (k + 1) to be turned on at time t22, so that the kth column channel and the (k + 1) th column channel have different turn-on times in the active period of the scan signal, and thus the kth column channel and the (k + 1) th column channel will pull current signals from the power source terminals based on the respective corresponding constant current sources at different times. Furthermore, when the (k + 1) th column channel corresponding to the high gray scale is turned on, and thus ripple and other low-frequency interference occurs in the power supply voltage VCC (for example, at the time t 22), because only a constant current source of one column channel pulls a current signal from the power supply end at the current time, the instantaneous current loss of the power supply is small, the ripple of the power supply voltage VCC is small, and the resistance of the system to electromagnetic interference (EMI) is favorably improved; meanwhile, the moment when the power supply voltage VCC generates ripples is not at the same moment as the starting moment of the kth row channel corresponding to the low gray scale, even the moment when the power supply voltage VCC generates ripples is not in the starting period of the kth row channel corresponding to the low gray scale, the influence of the starting of the row channel of the high gray scale on the starting width, namely the starting time of the row channel of the low gray scale is reduced, the problem of interference between the high gray scale and the low gray scale is solved, the display accuracy of the low gray scale is ensured, and the display effect and the display quality of a system are improved. It is understood that the opening of other column channels can be analogized to the foregoing description, and will not be described in detail here.
In some embodiments, the plurality of column channels may be configured to be sequentially turned on in time division according to the arrangement order, so as to reduce the control difficulty. In yet other embodiments, the plurality of column channels may be configured to be randomly time-shared.
Alternatively, the opening intervals of the plurality of column channels may be all the same or at least partially different. Exemplarily, assuming that the opening interval between the 1 st column channel and the 2 nd column channel is Δ t1, the opening interval between the 2 nd column channel and the 3 rd column channel is Δ t2, the opening interval between the 3 rd column channel and the 4 th column channel is Δ t3, and so on, and the opening interval between the N-1 st column channel and the N th column channel is Δ t (N-1), the values of Δ t1, Δ t2, Δ t3, ..., Δ t (N-1) may all be the same or at least partially different, and may be set according to actual needs.
In addition, during the opening periods of different row channels, the opening interval between the same two column channels may be fixed, or may be adaptively adjusted according to the opening time of the previously opened column channel.
In some preferred embodiments, for any two adjacent column channels that are turned on, when the turn-on time of the previously turned-on column channel (or the gray scale corresponding to the column channel) is less than the set threshold, the column channel that is turned on later may be configured to turn on after the previously turned-on column channel is turned off, so as to further reduce the influence on the display effect of the low gray scale.
Further, in some preferred embodiments, the control unit 121 in the column driving circuit 120 is further configured to provide a plurality of adjustment signals to the plurality of column channels so as to adjust the potential of the corresponding column channel to the initial potential before each column channel is turned on. Due to the parasitic effect existing in each column channel in practice, the plurality of column channels are easily in different potential states before being turned on each time, and the control unit 121 performs a pre-charging or pre-discharging operation on each column channel according to the current potential of the corresponding column channel before each column channel is turned on, so that the plurality of column channels can have the same potential (such as an initial potential) state before being turned on, and thus, the plurality of constant current driving signals can accurately drive the plurality of LED lamp beads to a required target gray scale.
Since the plurality of adjustment signals provided by the control unit 121 also have charging and discharging actions on the plurality of column channels, the control unit 121 is configured in this embodiment to provide the plurality of adjustment signals to the plurality of column channels in a time-sharing manner, so that the time when the electric potentials of the plurality of column channels are adjusted to the initial electric potentials is synchronized with the turn-on time of the corresponding column channels, and on the premise of ensuring accurate driving of the plurality of LED lamp beads, the influence of the plurality of adjustment signals on the electric potential adjustment actions of the plurality of column channels on accurate turn-on of the low gray level column channels is avoided, and the display effect of the display panel 130 on the low gray level is further ensured.
Alternatively, the row driver circuit 110 and the column driver circuit 120 may be integrated on different driver chips, respectively, or may be integrated on the same driver chip. The embodiments of the present invention are not limited thereto.
Further, the embodiment of the invention also discloses an LED driving method, which can be applied to the display device shown in the foregoing fig. 4 and fig. 5. Specifically, as shown in fig. 6, the LED driving method includes performing the steps of:
in step S11, gradation data is generated from the display image.
In step S12, a plurality of constant current driving signals are generated according to the gray-scale data.
In step S13, the plurality of column channels are controlled to be turned on in time division during the turn-on period of each of the plurality of row channels, and the plurality of constant current driving signals are supplied to the LED array in time division.
In some preferred embodiments, the LED driving method further includes: a plurality of adjustment signals are provided to the plurality of column channels in a time division manner to adjust the potential of the corresponding column channel to an initial potential before each column channel is turned on. The time when the potentials of the plurality of column channels are adjusted to the initial potentials is synchronous with the opening time of the corresponding column channel.
It should be noted that, for the specific implementation of each step in the above-described LED driving method, reference may be made to the foregoing embodiment of the display device, and details are not described herein again.
In summary, by configuring different starting times for a plurality of column channels, the instantaneous current loss of the power supply caused by instantaneous pull-down of a plurality of constant current driving signals to the power supply voltage VCC at the same time can be avoided, which is beneficial to reducing power supply ripples; meanwhile, at the joint position of the high gray scale and the low gray scale, the time-sharing opening of the plurality of row channels can also avoid the mutual influence between the adjacent channels during opening, thereby ensuring the display accuracy of the low gray scale and improving the display effect and the display quality of the system.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of ...does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. An LED driver circuit for driving an LED array, wherein the LED driver circuit comprises:
a row driver circuit to provide a plurality of scan signals to the LED array based on a plurality of row channels;
a column drive circuit to provide a plurality of constant current drive signals to the LED array based on a plurality of column channels,
wherein, in an active period of each scan signal, the plurality of column channels are configured to be time-divisionally turned on, so that the plurality of constant current driving signals are time-divisionally provided to the LED array.
2. The LED driving circuit according to claim 1, wherein the plurality of column channels are configured to be sequentially turned on in an order of arrangement.
3. The LED driving circuit according to claim 1, wherein the plurality of column channels are configured to be randomly time-shared on.
4. The LED driving circuit according to claim 2 or 3, wherein the turn-on intervals of the plurality of column channels are the same; alternatively, the open intervals of the plurality of column channels are at least partially different.
5. The LED driving circuit according to claim 1, wherein the column driving circuit comprises:
a control unit providing a plurality of control signals according to a display image;
a plurality of switches respectively arranged on the plurality of column channels, the plurality of switches being used for controlling the opening conditions of the plurality of column channels according to the plurality of control signals,
wherein the plurality of control signals are configured to control the plurality of column channels to be turned on time-divisionally by controlling the plurality of switches to be turned on time-divisionally.
6. The LED drive circuit of claim 5, wherein the control unit is further configured to provide a plurality of adjustment signals to adjust the potential of the corresponding column channel to an initial potential before each column channel is turned on,
wherein the plurality of adjustment signals are configured to be supplied to the plurality of column channels in a time-sharing manner so that timings of adjusting the potentials of the plurality of column channels to initial potentials are synchronized with turn-on timings of the corresponding column channels.
7. A display device, comprising:
a display panel;
the LED driving circuit according to any one of claims 1 to 6, for supplying a plurality of scanning signals and a plurality of constant current driving signals to drive the display panel.
8. The display device of claim 7, wherein the display panel comprises an LED display panel, an AMOLED display panel, a MicroLED display panel, or a MiniLED display panel.
9. An LED driving method for driving an LED array connected with a plurality of row channels and a plurality of column channels, wherein the LED driving method comprises:
generating gray scale data according to the display image;
generating a plurality of constant current driving signals according to the gray scale data;
and controlling the plurality of column channels to be switched on in a time-sharing manner during the switching-on period of each row channel in the plurality of row channels, and supplying the plurality of constant current driving signals to the LED array in a time-sharing manner.
10. The LED driving method according to claim 9, wherein the LED driving method further comprises:
providing a plurality of adjustment signals to the plurality of column channels in time division to adjust the potential of the corresponding column channel to an initial potential before each column channel is turned on,
and adjusting the electric potentials of the plurality of column channels to initial electric potentials at the same time as the opening time of the corresponding column channel.
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| CN202310258745.7A CN115985235B (en) | 2023-03-14 | 2023-03-14 | LED driving circuit, driving method and display device |
| TW112128683A TWI863470B (en) | 2023-03-14 | 2023-07-31 | Led driving circuit, driving method and display device |
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| CN118351782A (en) * | 2024-05-08 | 2024-07-16 | 武汉华星光电技术有限公司 | Driving circuit and display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI863470B (en) | 2024-11-21 |
| CN115985235B (en) | 2023-07-21 |
| TW202401399A (en) | 2024-01-01 |
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