CN106782292B - LED display screen, display control device thereof and column control circuit - Google Patents
LED display screen, display control device thereof and column control circuit Download PDFInfo
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- CN106782292B CN106782292B CN201611093002.5A CN201611093002A CN106782292B CN 106782292 B CN106782292 B CN 106782292B CN 201611093002 A CN201611093002 A CN 201611093002A CN 106782292 B CN106782292 B CN 106782292B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The invention belongs to the field of LED display control, and provides an LED display screen, a display control device thereof and a column control circuit. The column control circuit comprises m column control modules, and the column control modules comprise a pull-up switching tube and a current mirror switching tube. After any row of LED lamps of the LED display array are powered on, the m column control modules receive control signals; if the control signal is a first level signal, the current mirror switch tube is turned on, the pull-up switch tube is turned off, and the column control module outputs a low level signal to a column of LED lamps corresponding to the low level signal; if the control signal is a second level signal, the current mirror switch tube is turned off, the pull-up switch tube is turned on, and the column control module outputs a high level signal to a column of LED lamps corresponding to the high level signal. Because the column voltage is directly pulled up to the preset fixed voltage when the pull-up tube is conducted, the column voltage of each row of LED lamps is kept consistent when the LED lamps are conducted, and the problem that the first row of the traditional LED display screen is dark when the scanning display is conducted is solved.
Description
Technical Field
The invention belongs to the technical field of LED display control, and particularly relates to an LED display screen, a display control device thereof and a column control circuit thereof.
Background
The LED display screen is divided into a static LED display screen and a dynamic scanning type LED display screen. The dynamic scanning type LED display screen is characterized by taking the persistence of vision of a person as a design characteristic, and display control is carried out in a mode of gradually lighting LED lamps line by line.
Existing dynamic scanning LED display screens (as shown in fig. 1) include: a row scanning control circuit, a column control circuit and an LED display array; the column control circuit comprises a plurality of column control modules; the column control module comprises a pull-up tube M1, a clamping tube M2 and a current mirror tube M3. The row scanning control circuit is used for controlling the power-on time sequence of each row of LED lamps; the plurality of column control modules are used for lighting one or more LED lamps of a row according to control signals when the LED lamps of the row are powered on. Specifically, when the control signal is at a high level, M1 and M2 are turned off, M3 is turned on, and the column voltage of the LED lamp is pulled down to the ground, so that a sufficient voltage difference exists between two ends of the LED lamp, and the LED lamp is lighted at the moment; when the control signal is at a low level, M1 and M2 are turned on, M3 is turned off, the column voltage of the LED lamp is pulled up to VDD-VGS (VGS is the conduction voltage drop of the clamping tube M2), and at the moment, the voltage difference between the two ends of the LED lamp is insufficient to turn on the LED lamp. Thus, starting from the 1 st row, scanning line by line to the nth row to finish the display of a frame of picture, and returning to the 1 st row from the nth row to continuously scan line by line to finish the display of the next frame of picture. Because the time interval between the frames is larger than the time interval between the rows, when the frames are switched, the turn-off time of the LED lamps is longer, namely, when the turn-on time of M1 and M2 is longer, the M2 clamps the column voltage of the LED lamps to a higher level, so that the column voltage when the LED lamps of the 1 st row are turned on is higher than the column voltage when the LED lamps of the other rows are turned on, the average current when the LED lamps of the 1 st row are turned on is reduced compared with the average current when the LED lamps of the other rows are turned on, the brightness of the LED lamps of the first row is reduced, and the problem that the LED display screen of the first row is darker can be observed in actual display.
In summary, the existing LED display screen has the problem that the first row is darker during scanning display.
Disclosure of Invention
The invention aims to provide an LED display screen, a display control device and a column control circuit thereof, and aims to solve the problem that the first row of the existing LED display screen is dark during scanning display.
The invention is realized in such a way that a column control circuit of an LED display device is connected with an LED display array; the LED display array comprises n rows and m columns of LED lamps, wherein n and m are positive integers; the LED display array is also connected with a line scanning control circuit of the LED display control device; the line scanning control circuit is used for controlling the power-on time sequence of n lines of LED lamps of the LED display array; the array control circuit comprises m array control modules which are in one-to-one correspondence with m arrays of LED lamps of the LED display array, wherein the input ends of the m array control modules are used for receiving control signals, and the output ends of the m array control modules are in one-to-one correspondence with the m arrays of LED lamps of the LED display array; the column control module includes: a pull-up switching tube and a current mirror switching tube;
the high potential end of the pull-up switching tube is connected with a preset power supply, the low potential end of the pull-up switching tube and the high potential end of the current mirror switching tube are connected together to serve as the output end of the column control module, the control end of the pull-up switching tube and the control end of the current mirror switching tube are connected together to serve as the input end of the column control module, and the low potential end of the current mirror switching tube is grounded;
after any row of LED lamps of the LED display array are powered on, the input ends of the m column control modules receive the control signals; if the control signal received by the column control module is a first level signal, the current mirror switch tube is turned on, the pull-up switch tube is turned off, and the column control module outputs a low level signal to a column of LED lamps corresponding to the current mirror switch tube so as to enable the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps to be lighted; if the control signal received by the column control module is a second level signal, the current mirror switch tube is turned off, the pull-up switch tube is turned on, and the column control module outputs a high level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps are turned off.
The invention also provides a display control device which is connected with the LED display array, wherein the LED display control device comprises a row scanning control circuit, and the LED display control device also comprises the column control circuit.
The invention also provides an LED display screen, which comprises an LED display array, wherein the LED display screen comprises the LED display control device.
The column control circuit provided by the invention comprises m column control modules, wherein each column control module comprises a pull-up switching tube and a current mirror switching tube. After any row of LED lamps of the LED display array are powered on, the input ends of the m column control modules receive control signals; if the control signal received by the column control module is a first level signal, the current mirror switch tube is turned on, the pull-up switch tube is turned off, and the column control module outputs a low level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in a row of LED lamps which are electrified are lighted; if the control signal received by the column control module is a second level signal, the current mirror switch tube is turned off, the pull-up switch tube is turned on, and the column control module outputs a high level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps are turned off. Because the column voltage is directly pulled up to the preset fixed voltage when the pull-up switching tube is conducted, the column voltage when each row of LED lamps is conducted is kept consistent, and then the average current when each row of LEDs is conducted is kept consistent, namely the brightness of each row of LED lamps is kept consistent, and the problem that the first row of the traditional LED display screen is dark when in scanning display is solved.
Drawings
Fig. 1 is a circuit configuration diagram of an LED display provided in the prior art;
fig. 2 is a circuit configuration diagram of a column control circuit of an LED display control apparatus according to an embodiment of the present invention;
fig. 3 is a circuit configuration diagram of a column control circuit of an LED display control device according to another embodiment of the present invention;
FIG. 4 is a schematic diagram showing a comparison of column voltages of an LED display array according to an embodiment of the present invention;
fig. 5 is a circuit configuration diagram of an LED display control device according to an embodiment of the present invention;
fig. 6 is a circuit structure diagram of an LED display screen according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that the term "comprising" and any variations thereof in the description of the invention and in the claims is intended to cover a non-exclusive inclusion. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
Fig. 2 shows a circuit structure of a column control circuit of an LED display control device according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, which is described in detail as follows:
as shown in fig. 2, a column control circuit 12 of an LED display control device is connected to the LED display array 2, and the LED display array 2 is also connected to a row scanning control circuit 11 of the LED display control device. The LED display array 2 comprises n rows and m columns of LED lamps (LED 11-LED 1m, LED 21-LED 2m, … …, LEDn 1-LEDnm) and m parasitic capacitances C1-Cm which are arranged in an array; wherein n and m are both positive integers. The anodes of the LED lamps in each row are connected in common and are respectively connected with a plurality of output ends of the row scanning control circuit 11, the cathodes of the LED lamps in each column are connected in common and are respectively connected with a first end of each parasitic capacitor, and second ends of m parasitic capacitors C1-Cm are grounded.
The line scanning control circuit 11 is used for controlling the power-on time sequence of n lines of LED lamps of the LED display array 2. Specifically, in the scanning display process of a frame of picture, the line scanning control circuit 11 controls the 1 st line of LED lamps to the nth line of LED lamps to be sequentially electrified, that is, the line scanning control circuit 11 sequentially connects the 1 st line of LED lamps to the nth line of LED lamps with the first power supply, and the first power supply provides the power supply voltage VDD for the LED lamps.
The column control circuit 12 includes m column control modules X1 to Xm corresponding one by one to m columns of LED lamps of the LED display array 2. Specifically, the 1 st column control module X1 corresponds to the 1 st column LED lamp, the 2 nd column control module X2 corresponds to the 2 nd column LED lamp, and so on, and the m th column control module Xm corresponds to the m th column LED lamp. The input ends of the m column control modules X1-Xm are used for receiving control signals, and the output ends of the m column control modules X1-Xm are in one-to-one correspondence with m columns of LED lamps of the LED display array 2. Specifically, the output ends of the m row control modules X1-Xm are respectively connected with the cathodes of the m row LED lamps in a sharing way.
Each of the column control modules X1 to Xm includes: pull-up switching tube 120 and current mirror switching tube 121.
The high potential end of the pull-up switch tube 120 is connected with a preset power supply, the preset power supply provides a preset fixed voltage VH, the low potential end of the pull-up switch tube 120 and the high potential end of the current mirror switch tube 121 are commonly connected to serve as output ends of the column control modules X1 to Xm, the control end of the pull-up switch tube 120 and the control end of the current mirror switch tube 121 are commonly connected to serve as input ends of the column control modules X1 to Xm, and the low potential end of the current mirror switch tube 121 is grounded.
After any row of LED lamps of the LED display array 2 are powered on, the input ends of the m column control modules receive control signals; if the control signal received by the column control module is the first level signal, the current mirror switch tube 121 is turned on, the pull-up switch tube 120 is turned off, and the output end of the column control module outputs a low level signal to a column of ELD lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps are lighted; if the control signal received by the column control module is the second level signal, the current mirror switch tube 121 is turned off, the pull-up switch tube 120 is turned on, and the output end of the column control module outputs a high level signal to a column ELD lamp corresponding to the current mirror switch tube, so that the LED lamp on the column corresponding to the column control module in the powered-on row of LED lamps is turned off.
In the embodiment of the invention, the control signal can control one LED lamp in the powered-on row of LED lamps to be lightened, and can also control a plurality of LED lamps in the powered-on row of LED lamps to be lightened, namely, the control signal can be set by a user according to actual requirements, and the invention is not limited in the embodiment.
For example, if the LED display array 2 includes 3 rows×4 columns of LED lamps, the column control circuit 12 includes 4 column control modules X1 to X4. When the row scanning control circuit 11 controls the 4 LED lamps LED 11-LED 14 of the 1 st row to be powered on, the input ends of the 4 column control modules receive control signals. If the control signal is 1010, i.e. the level signals input to the 1 st column control module X1 to the 4 th column control module X4 are 1, 0, 1 and 0 respectively, the current mirror switch tube 121 is an N-type field effect tube, the pull-up switch tube 12 is a P-type field effect tube, at this time, the current mirror switch tube 121 in the 1 st column control module X1 and the 3 rd column control module X3 is turned on, the pull-up switch tube 120 is turned off, the output end of the 1 st column control module X1 and the output end of the 3 rd column control module X3 output low level signals to the 1 st column LED lamp and the 3 rd column LED lamp respectively, at this time, the column voltage of the 1 st column LED lamp and the column voltage of the 3 rd column LED lamp are pulled down to the ground, the differential voltage between the 1 st column LED lamp LED11 in the 1 st row and the 3 rd column LED lamp LED13 in the 1 st row is greater than the turn-on voltage, and the 1 st column LED lamp LED11 in the 1 st row is turned on; meanwhile, the current mirror switching transistors 121 in the 2 nd and 4 th column control modules X2 and X4 are turned off, the pull-up switching transistor 120 is turned on, and the output end of the 2 nd column control module X2 and the output end of the 4 th column control module X4 output high level signals to the 2 nd column LED lamp and the 4 th column LED lamp respectively, at this time, the column voltage of the 2 nd column LED lamp LED12 of the 1 st row and the column voltage of the 4 th column LED14 of the 1 st row are pulled up to a preset fixed voltage VH, that is, the voltage difference between the two ends of the 2 nd column LED lamp LED12 of the 1 st row and the 4 th column LED14 of the 1 st row is insufficient to turn on, so that the 2 nd column LED lamp LED12 of the 1 st row and the 4 th column LED14 of the 1 st row are turned off. Thus, the display control of one row of LED lamps is completed. The display control principle of the other rows of LED lamps is identical to the above principle, and is not repeated here. By the display control method, the display control of one frame of picture can be completed by scanning the 1 st row to the n th row in turn.
In practical applications, the preset fixed voltage VH is generally about 1V smaller than the power voltage VDD.
In the embodiment of the invention, the first level signal and the second level signal are mutually opposite signals. For example, if the first level signal is a low level signal, the second level signal is a high level signal; if the first level signal is a high level signal, the second level signal is a low level signal. Specifically, the pull-up switching tube 120 and the current mirror tube M2 may be provided according to the types, and are not limited herein.
As shown in fig. 2, as an embodiment of the present invention, the pull-up switch 120 is a first P-type field effect transistor P1, and the current mirror switch 121 is a first N-type field effect transistor N1.
The gate, source and drain of the first P-type field effect transistor P1 are the control terminal, the high potential terminal and the low potential terminal of the pull-up switch transistor 120, respectively, and the gate, source and drain of the first N-type field effect transistor N1 are the control terminal, the low potential terminal and the high potential terminal of the current mirror switch transistor 121, respectively.
Correspondingly, the first level signal is a high level signal; the second level signal is a low level signal.
Fig. 3 shows a circuit structure of a column control circuit of an LED display control device according to another embodiment of the present invention, as shown in fig. 3, in another embodiment of the present invention, the pull-up switch tube 120 is a second N-type field effect tube N2, and the current mirror switch tube 121 is a second P-type field effect tube P2.
The gate, source and drain of the second N-type field effect transistor N2 are the control terminal, the low potential terminal and the high potential terminal of the pull-up switch transistor 120, respectively, and the gate, source and drain of the second P-type field effect transistor P2 are the control terminal, the high potential terminal and the low potential terminal of the current mirror switch transistor 121, respectively.
Correspondingly, the first level signal is a low level signal; the second level signal is a high level signal.
It will be appreciated that in practical applications, the pull-up switch 120 and the current mirror switch 121 may be configured as transistors, thyristors, and other types of switch transistors, and the like, which are specifically configured according to practical situations, and are not limited herein.
Fig. 4 is a schematic diagram comparing column voltages of an LED display array according to the prior art and an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, which is described in detail below:
as shown in fig. 4, in the scanning display process of a frame of picture, the line scanning control circuit 11 outputs power-on time sequence signals A1 to An for controlling the power-on of the 1 st line LED lamp to the n line LED lamp in turn.
Referring to fig. 1, in the prior art, since the time intervals between rows are equal and relatively short, the column voltage of each row of LED lamps is clamped to VDD-VGS (VGS is the on-voltage drop of the clamping tube M2) by the clamping tube M2 when switching between rows. Because the time interval between the frames is longer than the time interval between the rows, when the frames are switched, the turn-off time of the LED lamps is longer, namely the turn-on time of the pull-up tube M1 and the clamp tube M2 is longer, at the moment, the clamp tube M2 can leak electricity to parasitic capacitance, so that the column voltage when the 1 st row of LED lamps is turned on is clamped to VDD by the clamp tube M2, namely the column voltage when the 1 st row of LED lamps is turned on is higher than the column voltage when each subsequent row of LED lamps is turned on, the time of the drop of the column voltage when the 1 st row of LED lamps is turned on is further increased, and finally the average current when the 1 st row of LED lamps is turned on is smaller than the average current when other rows of LED lamps are turned on, so that the 1 st row is in dark phenomenon.
In the embodiment of the invention, since the column voltage of the LED lamps is directly pulled up to the preset fixed voltage VH when the pull-up switching tube 120 is turned on, the column voltage of each row of LED lamps is not affected by the scanning time intervals between rows and between frames, that is, no matter how long the time intervals between rows or between frames are, the column voltages of each row of LED lamps are equal (all are the preset fixed voltage VH), so that the problem that the first row of the existing LED display screen is dark during scanning display can be solved.
The embodiment of the invention also provides an LED display control device. Fig. 5 shows a circuit structure of an LED display control device according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown, which are described in detail below:
as shown in fig. 5, an LED display control apparatus 1 is connected to an LED display array 2, and the LED display control apparatus 1 includes a row scanning control circuit 11 and a column control circuit 12 (only one embodiment is shown and the other embodiment is not shown) provided in the above-described embodiment.
The embodiment of the invention also provides an LED display screen. Fig. 6 shows a circuit structure of an LED display screen according to an embodiment of the present invention, and for convenience of explanation, only the portions related to the embodiment of the present invention are shown in detail as follows:
as shown in fig. 6, an LED display screen includes an LED display array 2, and the LED display screen further includes the LED display control device 1 provided in the foregoing embodiment (only one embodiment is shown in the figure, and another embodiment is not shown).
The column control circuit provided by the embodiment of the invention comprises m column control modules, wherein each column control module comprises a pull-up switching tube and a current mirror switching tube. After any row of LED lamps of the LED display array are powered on, the input ends of the m column control modules receive control signals; if the control signal received by the column control module is a first level signal, the current mirror switch tube is turned on, the pull-up switch tube is turned off, and the column control module outputs a low level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in a row of LED lamps which are electrified are lighted; if the control signal received by the column control module is a second level signal, the current mirror switch tube is turned off, the pull-up switch tube is turned on, and the column control module outputs a high level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps are turned off. Because the column voltage is directly pulled up to the preset fixed voltage when the pull-up switching tube is conducted, the column voltage when each row of LED lamps is conducted is kept consistent, and then the average current when each row of LEDs is conducted is kept consistent, namely the brightness of each row of LED lamps is kept consistent, and the problem that the first row of the traditional LED display screen is dark when in scanning display is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. A column control circuit of the LED display control device is connected with the LED display array; the LED display array comprises n rows of LED lamps with m columns of LED lamps and m parasitic capacitances, wherein n and m are positive integers; the LED display array is also connected with a line scanning control circuit of the LED display control device; specifically, anodes of the LED lamps in each row are connected in common and are respectively connected with a plurality of output ends of the row scanning control circuit, cathodes of the LED lamps in each column are connected in common and are respectively connected with a first end of each parasitic capacitor, and second ends of m parasitic capacitors are grounded; the line scanning control circuit is used for controlling the power-on time sequence of n lines of LED lamps of the LED display array; the array control circuit comprises m array control modules which are in one-to-one correspondence with m arrays of LED lamps of the LED display array, wherein the input ends of the m array control modules are used for receiving control signals, and the output ends of the m array control modules are in one-to-one correspondence with the m arrays of LED lamps of the LED display array; wherein the column control module comprises: a pull-up switching tube and a current mirror switching tube;
the high potential end of the pull-up switching tube is connected with a preset power supply, the low potential end of the pull-up switching tube and the high potential end of the current mirror switching tube are connected together to serve as the output end of the column control module, the control end of the pull-up switching tube and the control end of the current mirror switching tube are connected together to serve as the input end of the column control module, and the low potential end of the current mirror switching tube is grounded;
after any row of LED lamps of the LED display array is powered on, the input ends of the m column control modules receive the control signals; if the control signal received by the column control module is a first level signal, the current mirror switch tube is turned on, the pull-up switch tube is turned off, and the column control module outputs a low level signal to a column of LED lamps corresponding to the current mirror switch tube so as to enable the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps to be lighted; if the control signal received by the column control module is a second level signal, the current mirror switch tube is turned off, the pull-up switch tube is turned on, and the column control module outputs a high level signal to a column of LED lamps corresponding to the current mirror switch tube, so that the LED lamps on the column corresponding to the column control module in the powered-on row of LED lamps are turned off.
2. The column control circuit of claim 1, wherein the pull-up switching tube is a first P-type field effect tube and the current mirror switching tube is a first N-type field effect tube; the first level signal is a high level signal; the second level signal is a low level signal;
the grid electrode, the source electrode and the drain electrode of the first P-type field effect transistor are respectively a control end, a high potential end and a low potential end of the pull-up switch tube, and the grid electrode, the source electrode and the drain electrode of the first N-type field effect transistor are respectively a control end, a low potential end and a high potential end of the current mirror switch tube.
3. The column control circuit of claim 1, wherein the pull-up switching tube is a second N-type field effect tube and the current mirror switching tube is a second P-type field effect tube; the first level signal is a low level signal; the second level signal is a high level signal;
the grid electrode, the source electrode and the drain electrode of the second N-type field effect transistor are respectively a control end, a low potential end and a high potential end of the pull-up switch tube, and the grid electrode, the source electrode and the drain electrode of the second P-type field effect transistor are respectively a control end, a high potential end and a low potential end of the current mirror switch tube.
4. An LED display control device connected to an LED display array, the LED display control device comprising a row scan control circuit, wherein the LED display control device further comprises a column control circuit according to any one of claims 1 to 3.
5. An LED display screen comprising an LED display array, wherein the LED display screen further comprises an LED display control device according to claim 4.
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| CN201611093002.5A CN106782292B (en) | 2016-11-30 | 2016-11-30 | LED display screen, display control device thereof and column control circuit |
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| CN201611093002.5A CN106782292B (en) | 2016-11-30 | 2016-11-30 | LED display screen, display control device thereof and column control circuit |
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| CN108615501B (en) * | 2018-06-26 | 2024-01-16 | 富满微电子集团股份有限公司 | Driving method and driving circuit for eliminating ghosts of LED display screen and LED display screen |
| CN111063298B (en) | 2019-12-19 | 2021-06-29 | 合肥视涯技术有限公司 | Pixel driving circuit and display device |
| CN113450699B (en) * | 2020-07-07 | 2022-07-26 | 重庆康佳光电技术研究院有限公司 | Display control method and device of LED display screen, storage medium and electronic equipment |
| CN113487995B (en) * | 2021-07-07 | 2023-04-07 | 北京集创北方科技股份有限公司 | Control circuit of LED display device and driving method thereof |
| CN114299853B (en) * | 2021-12-24 | 2023-05-09 | 杭州海康威视数字技术股份有限公司 | LED display screen adjusting system, method, equipment and readable storage medium |
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| CN102522063A (en) * | 2011-12-05 | 2012-06-27 | 杭州士兰控股有限公司 | LED (light-emitted diode) display system capable of eliminating dynamic LED display ghost |
| WO2013181853A1 (en) * | 2012-06-05 | 2013-12-12 | 深圳市华星光电技术有限公司 | Led backlight system and display device |
| CN102779479A (en) * | 2012-08-17 | 2012-11-14 | 开源集成电路(苏州)有限公司 | LED (light-emitting diode) display system |
| CN203721164U (en) * | 2013-11-22 | 2014-07-16 | 苏州君嬴电子科技有限公司 | System for eliminating residual images of LED scanning screen |
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