CN216671170U - Pixel driving device - Google Patents
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- CN216671170U CN216671170U CN202123080684.5U CN202123080684U CN216671170U CN 216671170 U CN216671170 U CN 216671170U CN 202123080684 U CN202123080684 U CN 202123080684U CN 216671170 U CN216671170 U CN 216671170U
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Abstract
The application relates to the technical field of display, and particularly discloses a pixel driving device for realizing n-bit gray scale display of a pixel unit, the device comprises: the first driving unit is connected with the pixel unit and is used for sequentially transmitting a-bit gray scale data to the pixel unit in a display period; the second driving unit is connected with the pixel unit and is used for sequentially transmitting the b-bit gray scale data to the pixel unit in the display period; the first current source is connected with the pixel unit and provides a first driving current for the pixel unit, and the first driving current is a current corresponding to the high gray scale; the second current source is connected with the pixel unit and provides a second driving current for the pixel unit, and the second driving current is a current corresponding to the low gray scale; the first driving current is larger than the second driving current, and a + b is equal to n, wherein a, b and n are positive integers. Thereby facilitating accurate low gray scale display.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a pixel driving device.
Background
The Micro LED display technology is a display technology which takes self-luminous micron-scale LEDs as light-emitting pixel units and assembles the light-emitting pixel units on a driving panel to form a high-density LED array.
The digital display driving mode of the Micro LED generally comprises the steps of sending n-bit gray scale data into a pixel driving circuit one by one, refreshing and displaying by adopting n subframes, and realizing 2 by utilizing a pulse width modulation modenThe bits display gray levels. Assume that the lighting period of the first subframe is t0, the lighting period of the second subframe is 2 × to, and the lighting period of the third subframe is 22T0, and so on, the lighting time length of the nth sub-frame is 2n-1T 0. When the gray scale precision is high, the low gray scale development time is short, and under the condition of short time, the problems of short holding time, abnormal sampling and the like often occur.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a pixel driving device that addresses the above-mentioned problems.
A pixel driving device for implementing n-bit gray scale display of a pixel unit, the pixel driving device comprising:
the first driving unit is connected with the pixel unit and is used for sequentially transmitting a-bit gray scale data to the pixel unit in a display period;
the second driving unit is connected with the pixel unit and is used for sequentially transmitting b-bit gray scale data to the pixel unit in the display period;
the first current source is connected with the pixel unit and provides a first driving current for the pixel unit, and the first driving current is a current corresponding to a high gray scale;
the second current source is connected with the pixel unit and provides a second driving current for the pixel unit, and the second driving current is a current corresponding to a low gray scale;
the first driving current is larger than the second driving current, and a + b is equal to n, wherein a, b and n are positive integers.
In one embodiment, the a-bit gray scale data is a-bit data arranged at a higher level in the n-bit gray scale data, and the b-bit gray scale data is a b-bit data arranged at a lower level in the n-bit gray scale data.
In one embodiment, a ═ b.
In one embodiment, the first driving current and the second driving current satisfy the following relation:
Ib＝Ia/2a
wherein, IbRepresenting said second drive current, IaRepresenting the first drive current.
In one embodiment, the first driving unit includes a first data driving unit and a first pixel driving unit, and the first pixel driving unit is respectively connected to the first data driving unit, the first current source and the pixel unit;
the first data driving unit transmits corresponding gray scale data to the first pixel driving unit under the action of a driving signal, and the first pixel driving unit controls the connection of the first current source and the pixel unit under the driving of the gray scale data.
In one embodiment, the second driving unit includes a second data driving unit and a second pixel driving unit, and the second pixel driving unit is respectively connected to the second data driving unit, the second current source and the pixel unit;
the second data driving unit transmits corresponding gray scale data to the second pixel driving unit under the action of the driving signal, and the second pixel driving unit controls the connection of the second current source and the pixel unit under the driving of the gray scale data.
In one embodiment, the first data driving unit is connected with a first data line and a first driving signal line, the first data line is connected with corresponding gray scale data, and the first driving signal line is connected with a driving signal;
the second data driving unit is connected with a second data line and a second driving signal line, the second data line is connected with corresponding gray scale data, and the second driving signal line is connected with a driving signal.
In one embodiment, the first driving signal line is connected to the second driving signal line.
In one embodiment, the first data driving unit, the first pixel driving unit, the second data driving unit and the second pixel driving unit select driving switching tubes.
In the pixel driving device, the same pixel unit is provided with two sets of driving units and current sources, namely a first driving unit and a first current source, and a second driving unit and a second current source, n-bit gray scale data is divided into a-bit gray scale data and b-bit gray scale data, the a-bit gray scale data is transmitted to the pixel unit under the action of the first driving unit, a first driving current is provided to the pixel unit through the first current source, the b-bit gray scale data is transmitted to the pixel unit under the action of the second driving unit, and a second driving current is provided to the pixel unit through the second current source, wherein the first driving current is a current corresponding to a high gray scale, and the second driving current is a current corresponding to a low gray scale.
Therefore, a subframe or b subframes are included in one frame period, the number of the subframes is less than n, the one frame period is fixed, the number of the subframes is reduced, and each subframe period is lengthened, so that the lighting time of each subframe is prolonged, the low gray scale expansion time is prolonged, and accurate low gray scale display is facilitated. Meanwhile, a first driving current corresponding to a high gray scale and a second driving current corresponding to a low gray scale are set in each subframe period, and display brightness of each subframe is enhanced through superposition display of the high gray scale and the low gray scale, so that the display effect of one frame of data can reach the n-bit gray scale display effect in the traditional technology.
Drawings
Fig. 1 is a schematic structural diagram of a pixel driving device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a pixel driving device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a pixel driving device according to an embodiment of the present disclosure.
Description of reference numerals:
100. a pixel unit; 110. a first drive unit; 111. a first data driving unit; 112. a first pixel driving unit; 113. a first data line; 114. a first driving signal line; 120. a first current source; 210. a second driving unit; 211. a second data driving unit; 212. a second pixel driving unit; 213. a second data line; 214. a second drive signal line; 220. a second current source.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many 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.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As described in the background art, the digital display driving mode of the Micro LED generally comprises the steps of sending n bit gray scale data into a pixel driving circuit one by one, refreshing and displaying by adopting n subframes, and realizing 2 by utilizing a pulse width modulation modenThe bits display gray levels. Assume that the lighting period of the first subframe is t0, the lighting period of the second subframe is 2 × to, and the lighting period of the third subframe is 22T0, and so on, the lighting time length of the nth sub-frame is 2n-1T 0. When the gray scale precision is high, the low gray scale development time is short, for example, when the gray scale development is performed by using n ═ 16, the low gray scale development time is short, and since the driving waveform has a rising edge and a falling edge, in the case of short development time, problems such as short holding time of low gray scale display and sampling abnormality often occur.
In order to solve the above problems, the present application provides a pixel driving device and a pixel driving method.
In one embodiment, a pixel driving device is provided for implementing an n-bit grayscale display of a pixel cell.
In the conventional technology, n-bit gray scale data are often sequentially transmitted to the same pixel unit to realize the display of n subframes, and the lighting time of each subframe is controlled to realize the n-bit gray scale display of the pixel unit. The larger the value of n is, the larger the number of sub-frames is, the higher the precision of the gray scale is, and the lighting time length of each sub-frame is in an increasing trend. In practical applications, when the precision of the gray scale reaches a certain degree, the display duration of the first several lit sub-frames is often very short, i.e. the low gray scale development time is short, which further causes the problems of short holding time and abnormal sampling, for example, when n is greater than or equal to 16, the above problems exist. In the present embodiment, n-16 will be described as an example.
Referring to fig. 1, the pixel driving device provided in this embodiment includes a first driving unit 110, a second driving unit 210, a first current source 120, and a second current source 220.
Specifically, the first driving unit 110 is connected to the pixel unit 100, and is configured to sequentially transmit a-bit gray-scale data to the pixel unit 100 in a display period. The second driving unit 210 is connected to the pixel unit 100, and is configured to sequentially transmit the b-bit gray scale data to the pixel unit 100 in a display period. The first current source 120 is connected to the pixel unit 100 and configured to provide a first driving current, where the first driving current is a current corresponding to a high gray level. The second current source 220 is connected to the pixel unit 100 and configured to provide a second driving current, which is a current corresponding to the low gray level. The first driving current is larger than the second driving current, and a + b is equal to n, wherein a, b and n are positive integers.
In this embodiment, the n-bit gray scale data is split into a-bit gray scale data and b-bit gray scale data, the a-bit gray scale data is sequentially transmitted to the pixel unit 100 through the first driving unit 110, and the b-bit gray scale data is sequentially transmitted to the pixel unit 100 through the second driving unit 210, that is, in the same sub-frame period, the pixel unit 100 receives two gray scale data at the same time and performs synchronous driving display under the driving action of the first driving current and the second driving current.
In the conventional technology, a frame period includes n subframe periods, in this embodiment, n is divided into a and b, two sets of driving units and current sources are configured corresponding to the same pixel unit, that is, a first driving unit and a first current source, and a second driving unit and a second current source, the n-bit gray scale data is divided into a-bit gray scale data and b-bit gray scale data, the a-bit gray scale data is transmitted to the pixel unit under the action of the first driving unit, a first driving current is provided to the pixel unit through the first current source, and the b-bit gray scale data is transmitted to the pixel unit and a second driving current is provided to the pixel unit through the second current source under the action of the second driving unit, wherein the first driving current is a current corresponding to a high gray scale, and the second driving current is a current corresponding to a low gray scale.
In this embodiment, one frame period includes a subframes or b subframes, which is less than n subframes. The frame period is fixed, the number of the sub-frames is reduced, and each sub-frame period is lengthened, so that the lighting time of each sub-frame is prolonged, the low gray scale expansion time is prolonged, and accurate low gray scale display is facilitated. Meanwhile, a first driving current corresponding to a high gray scale and a second driving current corresponding to a low gray scale are configured in each subframe period, and display brightness of each subframe is enhanced through superposition display of the high gray scale and the low gray scale, so that the display effect of one frame of data can reach the n-bit gray scale display effect in the conventional technology.
In a first sub-frame period, the first driving unit 110 transmits the 1 st bit gray scale data of the a bit gray scale data to the pixel unit 100, and the second driving unit 210 transmits the 1 st bit gray scale data of the b bit gray scale data to the pixel unit 100; in the next sub-frame period, the first driving unit 110 transmits the 2 nd bit gray scale data of the a bit gray scale data to the pixel unit 100, and simultaneously, the second driving unit 210 transmits the 2 nd bit gray scale data of the b bit gray scale data to the pixel unit 100; and so on, until the first driving unit 110 transmits the a-th bit gray scale data to the pixel unit 100, and the second driving unit 210 transmits the b-th bit gray scale data to the pixel unit 100. Since a and b are not necessarily equal, the number of subframes is the larger of a and b.
Assume that the lighting period of the first sub-frame is t0, the lighting period of the second sub-frame is 2 × to, and the lighting period of the third sub-frame is 22T0, and so on, the lighting time of the i-th sub-frame is 2i-1T 0. That is, the lighting time period of the a-th subframe is 2a-1T0, the lighting time length of the b-th sub-frame is 2b-1*t0。
In one embodiment, the a-bit gray scale data is a-bit data arranged at a higher level among the n-bit gray scale data, and the b-bit gray scale data is a b-bit data arranged at a lower level among the n-bit gray scale data. Let n be 16, and n-bit grayscale data be 1011101010101110; for example, a-bit gray scale data is 10 bits, b-bit gray scale data is 6 bits, i.e., the high-order 10-bit data 1011101010, and b-bit gray scale data is the low-order 6-bit data 101110; for another example, the a-bit gray scale data is 8 bits of data 10111010 with the upper 8 bits, and the b-bit gray scale data is 8 bits of data 10101110 with the lower 8 bits; for example, the a-bit gray scale data is 6-bit data 101110 with 6 high bits, and the b-bit gray scale data is 10 low-bit data 1010101110 with 10 low bits. In practical applications, the n-bit gray scale data may be divided at different positions according to practical situations, and is not limited herein.
In one embodiment, a ═ b. When a is equal to b, the number of subframes is reduced to half of the original number, i.e. n/2, and each subframe period is equivalent to two times of the original number. Taking a 100hz refresh rate, n-16 as an example, in the conventional scheme, the display period of one frame is 1/100hz, i.e. 10ms, the period of one subframe is 10/16, i.e. 0.625ms, and the lighting duration of the first subframe (i.e. the shortest lighting duration) is 0.625/216-1I.e., 19 ns; in the present embodiment, the display period of one frame is still 10ms, and since one frame is divided into 8 subframes, that is, one subframe period is 10/8, that is, 1.25ms, the lighting period (that is, the shortest lighting period) of the first subframe is 1.25/28-1I.e. 9.8 mus. It is known that when a is equal to b, the shortest lighting time is increased to the greatest extent, which is effective for developing low gray scales.
In one embodiment, the first driving current and the second driving current satisfy the following relation:
Ib＝Ia/2a
wherein, IbRepresents the second drive current, IaRepresenting a first drive current.
Under the driving of the first driving current, the pixel unit 100 can realize high gray scale display, under the driving of the second driving current, the pixel unit 100 can realize low gray scale display, and under the synchronous driving of the first driving current and the second driving current, the pixel unit can realize the mixed display of high gray scale and low gray scale. By setting the values of the first driving current and the second driving current to satisfy the above correspondence, the display luminance of the pixel unit 100 can be improved to a corresponding degree in the same subframe, and the lowest display luminance corresponding to the first driving current corresponds to the highest display luminance corresponding to the second driving current in the same subframe, so that the n-bit gray scale display effect can be satisfied also when the number of subframes is reduced.
Referring to fig. 2, in one embodiment, the first driving unit 110 includes a first data driving unit 111 and a first pixel driving unit 112, and the first pixel driving unit 112 is connected to the first data driving unit 111, the first current source 120, and the pixel unit 100, respectively. The first data driving unit 111 transmits corresponding gray scale data to the first pixel driving unit 112 under the action of the driving signal, and the first pixel driving unit 112 controls the connection between the first current source 120 and the pixel unit 100 under the driving of the gray scale data.
That is, the first data driving unit 111 is configured to receive a driving signal and transmit corresponding gray scale data to the first pixel driving unit 112 in response to the driving signal, where the gray scale data may be 0 or 1, and the first pixel driving unit 112 may control, according to the actually received gray scale data, on or off between the first current source 120 and the pixel unit 100, that is, on transmits the first driving current provided by the first current source to the pixel unit to drive the pixel unit 100 to emit light, and off turns off the pixel unit 100 when off.
The first data driving unit 111 may be connected to a first data line 113 and a first driving signal line 114, where the first data line 113 is used for receiving corresponding gray-scale data, and the first driving signal line 114 is used for receiving a driving signal. When the first driving signal line 114 receives a driving signal, the first data line 113 and the first pixel driving unit 112 may be turned on, the gray-scale data received by the first data line 113 may be transmitted to the first pixel driving unit 112, or the connection between the first data line 113 and the first pixel driving unit 112 may be turned off.
Referring to fig. 2, in one embodiment, the second driving unit 210 includes a second data driving unit 211 and a second pixel driving unit 212, and the second pixel driving unit 212 is respectively connected to the second data driving unit 211, the second current source 220, and the pixel unit 100. The second data driving unit 211 transmits corresponding gray scale data to the second pixel driving unit 212 under the action of the driving signal, and the second pixel driving unit 212 controls the connection between the second current source 220 and the pixel unit 100 under the driving of the gray scale data.
That is, the second data driving unit 211 is configured to receive a driving signal and transmit corresponding gray-scale data to the second pixel driving unit 212 in response to the driving signal, where the gray-scale data may be 0 or 1, and the second pixel driving unit 212 may control, according to the actually received gray-scale data, on or off between the second current source 220 and the pixel unit 100, that is, on transmits the second driving current provided by the second current source to the pixel unit to drive the pixel unit 100 to emit light, and off turns off the pixel unit 100.
The second data driving unit 211 may be connected to a second data line 213 and a second driving signal line 214, where the second data line 213 is used for accessing corresponding gray-scale data, and the second driving signal line 214 is used for accessing a driving signal. When the second driving signal line 214 receives the driving signal, the second data line 213 and the second pixel driving unit 212 may be turned on, the gray-scale data received by the second data line 213 may be transmitted to the second pixel driving unit 212, or the connection between the second data line 213 and the second pixel driving unit 212 may be turned off.
For example, sending gray scale data 0 to the first pixel driving unit, disconnecting the first current source from the pixel unit, and sending gray scale data 1 to the second pixel driving unit, connecting the second current source with the pixel unit, that is, driving the pixel unit to emit light by the second driving current; or sending the gray scale data 1 to the first pixel driving unit, wherein the first current source is connected with the pixel unit, and meanwhile sending the gray scale data 0 to the second pixel driving unit, and the second current source is disconnected with the pixel unit, namely, the pixel unit is driven to emit light by the first driving current; or sending the gray scale data 1 to the first pixel driving unit, wherein the first current source is connected with the pixel unit, and meanwhile sending the gray scale data 1 to the second pixel driving unit, and the second current source is connected with the pixel unit, namely, the pixel unit is driven to emit light by the driving current obtained by superposing the first driving current and the second driving current; or, sending the gray scale data 0 to the first pixel driving unit, the first current source is disconnected from the pixel unit, and meanwhile, sending the gray scale data 0 to the second pixel driving unit, the second current source is disconnected from the pixel unit, that is, the pixel unit is turned off.
In one embodiment, the first driving signal line 114 is connected to the second driving signal line 214. That is, the driving signals may be simultaneously supplied to the first data driving unit 111 and the second data driving unit 211, whereby the circuit structure may be simplified, the wiring space may be reduced, the cost may be reduced, and simultaneously the input of the a-bit gray scale data and the b-bit gray scale data may be conveniently controlled in synchronization.
Referring to fig. 3, in one embodiment, the first data driving unit 111, the first pixel driving unit 112, the second data driving unit 211, and the second pixel driving unit 212 are driving switching transistors. For example, an NMOSFET (N-type Metal-Oxide-Semiconductor Field-Effect Transistor) or a PMOSFET (P-type Metal-Oxide-Semiconductor Field-Effect Transistor) may be selected.
In one embodiment, the pixel unit 100 may be a light emitting diode, and specifically may include an inorganic light emitting diode, an organic light emitting diode, a quantum dot light emitting diode, and the like.
In one embodiment, a pixel driving method is provided, which can implement n-bit gray scale display of a pixel unit by using the pixel driving device.
The pixel driving method provided by the embodiment comprises the following steps: in the same display period, the display device is in a display period,
step S110, controlling the first driving unit 110 to sequentially transmit the a-bit gray scale data to the pixel unit 100, and providing a first driving current to the pixel unit through the first current source, where the first driving current is a current corresponding to the high gray scale.
Step S120, simultaneously controlling the second driving unit 210 to sequentially transmit the b-bit gray scale data to the pixel unit 100, and providing a second driving current to the pixel unit through the second current source, where the second driving current is a current corresponding to the low gray scale.
The first driving current is larger than the second driving current, and a + b is equal to n, wherein a, b and n are positive integers.
In the conventional technology, a frame period includes n subframe periods, in this embodiment, n is divided into a and b, two sets of driving units and current sources are configured corresponding to the same pixel unit, that is, a first driving unit and a first current source, and a second driving unit and a second current source, the n-bit gray scale data is divided into a-bit gray scale data and b-bit gray scale data, the a-bit gray scale data is transmitted to the pixel unit under the action of the first driving unit, a first driving current is provided to the pixel unit through the first current source, and the b-bit gray scale data is transmitted to the pixel unit and a second driving current is provided to the pixel unit through the second current source under the action of the second driving unit, wherein the first driving current is a current corresponding to a high gray scale, and the second driving current is a current corresponding to a low gray scale.
In this embodiment, one frame period includes a subframes or b subframes, and less than n subframes. The frame period is fixed, the number of the sub-frames is reduced, and each sub-frame period is lengthened, so that the lighting time of each sub-frame is prolonged, the low gray scale expansion time is prolonged, and accurate low gray scale display is facilitated. Meanwhile, a first driving current corresponding to a high gray scale and a second driving current corresponding to a low gray scale are configured in each subframe period, and the display brightness of each subframe is enhanced through the superposition display of the high gray scale and the low gray scale, so that the display effect of one frame of data can reach the n-bit gray scale display effect in the traditional technology.
In one embodiment, the a-bit gray scale data is a-bit data arranged at a higher level in the n-bit gray scale data, and the b-bit gray scale data is a b-bit data arranged at a lower level in the n-bit gray scale data.
In one embodiment, a ═ b.
In one embodiment, the first driving current and the second driving current satisfy the following relation:
Ib＝Ia/2a
wherein, IbRepresents the second drive current, IaRepresenting a first drive current.
In one embodiment, the first driving unit 110 includes a first data driving unit 111 and a first pixel driving unit 112, and the first pixel driving unit 112 is respectively connected to the first data driving unit 111, the first current source 120, and the pixel unit 100.
In step S110, the first data driving unit 111 transmits the corresponding gray-scale data to the first pixel driving unit 112 under the action of the driving signal, and the first pixel driving unit 112 controls the connection between the first current source 120 and the pixel unit 100 under the driving of the gray-scale data.
In one embodiment, the second driving unit 210 includes a second data driving unit 211 and a second pixel driving unit 212, and the second pixel driving unit 212 is respectively connected to the second data driving unit 211, the second current source 220 and the pixel unit 100.
In step S120, the second data driving unit 211 transmits the corresponding gray-scale data to the second pixel driving unit 212 under the action of the driving signal, and the second pixel driving unit 212 controls the connection between the second current source 220 and the pixel unit 100 under the driving of the gray-scale data.
In one embodiment, the first driving signal line 114 is connected to the second driving signal line 214.
In one embodiment, the first data driving unit 111, the first pixel driving unit 112, the second data driving unit 211, and the second pixel driving unit 212 are driving switches.
The pixel driving method provided in this embodiment and the pixel driving device provided in the previous embodiment belong to the same application concept, and for the specific content of the pixel driving method provided in this embodiment, reference may be made to the related description of the pixel driving device, and no further description is given here.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pixel driving device for implementing an n-bit grayscale display of a pixel unit, the pixel driving device comprising:
the first driving unit is connected with the pixel unit and is used for sequentially transmitting a-bit gray scale data to the pixel unit in a display period;
the second driving unit is connected with the pixel unit and is used for sequentially transmitting b-bit gray scale data to the pixel unit in the display period;
the first current source is connected with the pixel unit and provides a first driving current for the pixel unit, and the first driving current is a current corresponding to a high gray scale;
the second current source is connected with the pixel unit and provides a second driving current for the pixel unit, and the second driving current is a current corresponding to a low gray scale;
the first driving current is larger than the second driving current, and a + b is equal to n, wherein a, b and n are positive integers.
2. The pixel driving device according to claim 1, wherein the a-bit gray scale data is a-bit data arranged higher in the n-bit gray scale data, and the b-bit gray scale data is b-bit data arranged lower in the n-bit gray scale data.
3. A pixel driving device according to claim 1, wherein a-b.
4. The pixel driving device according to claim 1, wherein the first driving current and the second driving current satisfy the following relation:
Ib＝Ia/2a
wherein, IbRepresenting said second drive current, IaRepresenting the first drive current.
5. The pixel driving device according to claim 1, wherein the first driving unit comprises a first data driving unit and a first pixel driving unit, and the first pixel driving unit is respectively connected to the first data driving unit, the first current source and the pixel unit;
the first data driving unit transmits corresponding gray scale data to the first pixel driving unit under the action of a driving signal, and the first pixel driving unit controls the connection of the first current source and the pixel unit under the driving of the gray scale data.
6. The pixel driving device according to claim 5, wherein the second driving unit comprises a second data driving unit and a second pixel driving unit, and the second pixel driving unit is respectively connected to the second data driving unit, the second current source and the pixel unit;
the second data driving unit transmits corresponding gray scale data to the second pixel driving unit under the action of the driving signal, and the second pixel driving unit controls the connection of the second current source and the pixel unit under the driving of the gray scale data.
7. The pixel driving device according to claim 6, wherein the first data driving unit is connected to a first data line and a first driving signal line, the first data line is connected to corresponding gray scale data, and the first driving signal line is connected to a driving signal;
the second data driving unit is connected with a second data line and a second driving signal line, the second data line is connected with corresponding gray scale data, and the second driving signal line is connected with a driving signal.
8. The pixel driving device according to claim 7, wherein the first driving signal line is connected to the second driving signal line.
9. The pixel driving device according to claim 7, wherein the first data driving unit, the first pixel driving unit, the second data driving unit, and the second pixel driving unit are driving switches.
10. A pixel driving device according to any one of claims 1-9, wherein the pixel cell comprises a light emitting diode.
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