CN112820235B - Electric appliance, driving device and driving system of display screen - Google Patents
Electric appliance, driving device and driving system of display screen Download PDFInfo
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- CN112820235B CN112820235B CN201911035412.8A CN201911035412A CN112820235B CN 112820235 B CN112820235 B CN 112820235B CN 201911035412 A CN201911035412 A CN 201911035412A CN 112820235 B CN112820235 B CN 112820235B
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- driving
- driving unit
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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]
Abstract
The invention provides a driving device and a driving system of an electric appliance and a display screen, wherein the driving device comprises: the control unit is connected with the driving unit through a serial peripheral interface bus; the control unit is used for transmitting a control signal to the driving unit; the driving unit comprises a filter circuit and a driving circuit, the filter circuit is used for filtering the control signal, and the driving circuit is used for driving the display screen to display under the control of the filtered control signal. The driving device solves the problem that the display screen always flickers due to interference signals in the prior art, can improve the display effect and the display quality of the display screen, and can also improve the product design quality.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a driving device of a display screen, a driving system of the display screen and an electric appliance with the driving system.
Background
At present, the application of household electrical appliance LED (Light-Emitting Diode) display screens is very wide, the number of LED lamps included in the display screen is increasing, in order to reduce the design cost, each large manufacturer basically adopts a professional display driver IC to drive the display screen, because the display driver IC is controlled by an SPI (Serial Peripheral Interface) communication mode, the SPI communication is easily interfered, so that display screen flickering malfunction often occurs in a group pulse interference test of household electrical appliances, so that the customer acceptance cannot be obtained, a PCB (Printed Circuit Board) and related designs need to be changed constantly, which results in wasting too many design resources and also seriously affects the research and development progress.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a driving apparatus for a display screen, which can solve the problem of the prior art that the display screen often flickers due to an interference signal, and can improve the display effect and the display quality of the display screen, and also can improve the product design quality.
A second object of the present invention is to provide a driving system for a display panel.
A third object of the invention is to propose an electrical appliance.
In order to achieve the above object, a first embodiment of the present invention provides a driving apparatus for a display panel, including: the control unit is connected with the driving unit through a serial peripheral interface bus; the control unit is used for transmitting a control signal to the driving unit; the driving unit includes: the filter circuit is used for filtering the control signal; and the driving circuit is used for driving the display screen to display under the control of the filtered control signal.
According to the driving device of the display screen, the control unit is connected with the driving unit through the serial peripheral interface bus, so that the control unit transmits the control signal to the driving unit, the filtering circuit of the driving unit filters the control signal, and the driving circuit drives the display screen to display under the control of the filtered control signal. Therefore, the device solves the problem of misoperation that flicker often appears on the display screen due to interference signals in the prior art, can improve the display effect and the display quality of the display screen, and can also improve the product design quality.
In addition, the driving device for a display panel according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, the control signal comprises at least two signals, the number of the filter circuits is equal to the number of the control signals; the filter circuit is used for filtering the corresponding control signal.
According to one embodiment of the present invention, the communication interval time between the control unit and the driving unit is greater than a preset interval time threshold.
According to one embodiment of the invention, the interval time threshold is equal to or greater than 90 milliseconds.
According to one embodiment of the invention, the control signal comprises a strobe signal STB and a data signal DIN; the strobe signal STB is at a low level when the control unit communicates with the driving unit, so that the driving unit receives the data signal DIN; the strobe signal STB is pulled high at the end of each communication between the control unit and the driving unit, so that the driving unit stops receiving the data signal DIN.
According to one embodiment of the invention, the control signal comprises a clock signal CLK; when the clock signal CLK has a rising edge and maintains a high level, triggering the driving unit to latch the data signal DIN; when the clock signal CLK is low, the driving unit stops latching the data signal DIN.
According to an embodiment of the present invention, a communication frequency between the control unit and the driving unit is less than a preset frequency threshold.
According to one embodiment of the invention, the frequency threshold is equal to or less than 110 KHZ.
According to an embodiment of the present invention, a high level duty cycle of the clock signal CLK is less than a preset duty cycle threshold, and the duty cycle threshold is less than 50%.
According to an embodiment of the present invention, the clock signal CLK is set to a low level when the driving unit stops latching the data signal DIN.
In order to achieve the above object, a second embodiment of the present invention provides a driving system for a display panel, including: display screen and the drive arrangement of the display screen of the embodiment that has just been described.
According to the driving system of the display screen, disclosed by the embodiment of the invention, through the driving device of the display screen, the misoperation that the display screen always flickers due to interference signals in the prior art is solved, the display effect and the display quality of the display screen can be improved, and meanwhile, the product design quality can also be improved.
In order to achieve the above object, an embodiment of a third aspect of the present invention provides an electric appliance, including: the driving system of the display screen of the above embodiment.
The electric appliance of the embodiment of the invention solves the problem of misoperation that the display screen always flickers due to interference signals in the prior art through the driving system of the display screen, can improve the display effect and the display quality of the display screen, and can also improve the product design quality.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block schematic diagram of a driving apparatus for a display panel according to one embodiment of the present invention;
FIG. 2 is a circuit diagram of a driving apparatus of a display panel according to an embodiment of the present invention;
FIG. 3 is a timing diagram of software communications according to one embodiment of the invention;
FIG. 4 is a block schematic diagram of a drive system for a display screen according to an embodiment of the invention; and
FIG. 5 is a block schematic diagram of an appliance according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A driving apparatus of a display panel, a driving system of a display panel, and an electric appliance having the driving system according to embodiments of the present invention will be described below with reference to the accompanying drawings.
Through the analysis of the communication principle of the serial peripheral interface SPI bus, the reason that the LED display screen flickers is that interference signals generated by a test interference source are coupled to a strobe signal STB, a clock signal CLK, a data signal DIN and an output signal DOUT through the SPI bus, so that correct signals generated in the communication process are damaged. Therefore, the invention provides a driving device of a display screen, which can solve the problem of frequent flicker and misoperation of the display screen caused by interference signals in the prior art.
Fig. 1 is a block diagram of a driving apparatus of a display panel according to an embodiment of the present invention, and fig. 2 is a circuit diagram of the driving apparatus of the display panel according to an embodiment of the present invention.
Referring to fig. 1 and 2, a driving apparatus 100 for a display panel according to an embodiment of the present invention includes: a control unit 110 and a drive unit 120.
The control unit 110 is connected to the driving unit 120 through an SPI bus (the length of the bus may be about 10 centimeters), and the control unit 110 is configured to transmit a control signal to the driving unit 120. The driving unit 120 includes a filter circuit 122 and a driving circuit 123. The filter circuit 122 is configured to filter the control signal, and the driving circuit 123 drives the display screen 200 to display under the control of the filtered control signal. When the control unit 110 is connected to the drive unit 120 via the SPI bus, it can be connected via the signal interface 1211 and the signal interface 1212.
Optionally, the filter circuit 122 is an RC filter circuit.
According to the driving device of the display screen, the control unit is connected with the driving unit through the serial peripheral interface bus, so that the control unit transmits the control signal to the driving unit, the filtering circuit of the driving unit filters the control signal, and the driving circuit drives the display screen to display under the control of the filtered control signal.
As a possible implementation manner, the communication frequency between the control unit 110 and the driving unit 120 is less than a preset frequency threshold, and the preset frequency threshold is equal to or less than 110KHZ, and preferably may be 100 KHZ. The filtering circuit 122 can better cooperate with the filtering of the control signal by adopting the frequency threshold value less than the preset frequency threshold value for communication, thereby better weakening the influence of interference signals and avoiding the problem of screen flashing of the display screen.
As a possible implementation manner, on the basis of the above embodiment, the control unit 110 includes at least two control signals, the number of the filter circuits 122 is equal to the number of the control signals, each filter circuit 122 is used for filtering a corresponding one of the control signals, for example, the control signals may include a strobe signal STB, a data signal DIN and a clock signal CLK, and one filter circuit is provided for each of the pins of the strobe signal STB, the data signal DIN and the clock signal CLK to attenuate the interference waveforms of the STB pin, the DIN pin and the CLK pin.
As a possible implementation, the control signal includes a strobe signal STB and a data signal DIN; the strobe signal STB and the data signal DIN are respectively connected with corresponding filter circuits 122, and the filter circuit 122 connected with the strobe signal STB is used for filtering the signal output by the strobe signal STB; the filter circuit 122 connected to the data signal DIN is used for filtering the signal output by the data signal DIN.
The strobe signal STB is low when the control unit 110 communicates with the driving unit 120 so that the driving unit 120 receives the data signal DIN. The strobe signal STB is used to control whether the driving unit 120 receives the data output by the data signal DIN, when the strobe signal STB is at a low level, the driving unit 120 can receive the data output by the data signal DIN, when the strobe signal STB is at a high level, the driving unit 120 cannot receive the data output by the data signal DIN. Therefore, the strobe signal STB is always in the low state during the communication between the control unit 110 and the driving unit 120. As shown in fig. 3, when the strobe signal STB is in the recessed area, the driving unit 120 can receive the data signal DIN, which is equivalent to turning on a channel between the driving unit 120 and the data signal DIN.
In order to prevent the control signal in the control unit from being interfered by the interference signal when the communication is not conducted, the strobe signal STB is pulled high when the communication between the control unit 110 and the driving unit 120 is ended each time, so that the driving unit 120 stops receiving the signal output by the data signal DIN. As shown in fig. 3, when the strobe signal STB is in the protruding region, the driving unit 120 may not receive the data signal DIN, which corresponds to the channel between the driving unit 120 and the data signal DIN being cut off.
As a possible implementation manner, in order to reduce the time during which the display data is interfered by the interference signal, the communication interval time between the control unit 110 and the driving unit 120 is greater than the preset interval time threshold. Preferably, the preset interval time threshold is equal to or greater than 90 ms, such as 100 ms. The communication interval time between the control unit 110 and the driving unit 120 is increased, so that the interfered time can be reduced, and a useful data signal can be acquired better.
As can be seen from the analysis of the prior art, when the control unit 110 and the driving unit 120 communicate normally, and the clock signal CLK is at a normal high level, if the clock signal CLK is disturbed by the disturbing signal, a false falling edge signal and a false rising edge signal are generated, and when the false rising edge signal occurs, the data output by the data signal DIN is also latched into the driving unit 120, so that the display data is not normal, and the display screen flickers.
As a possible implementation, the control signal further comprises a clock signal CLK. The clock signal CLK is connected to the corresponding filter circuit 122, and a signal output from the clock signal CLK is filtered by the connected filter circuit 122. When the clock signal CLK rises and remains high, the driving unit 120 is triggered to latch the data signal DIN; as shown in fig. 3, the rising edge of the clock signal CLK refers to the time when the clock signal CLK transitions from low to high. When the clock signal CLK is low, the driving unit 120 stops latching the data signal DIN. That is, when the clock signal CLK is at a low level, the driving unit 120 cannot complete the operation of latching the data signal DIN.
As a possible implementation, the clock signal CLK is set to a low level when the driving unit 120 stops latching the data signal DIN. During the communication between the control unit 110 and the driving unit 120, the control unit 110 obtains the state of the driving unit 120 in real time, and when the driving unit 120 is in the non-latching state, the control unit 110 controls the clock signal CLK to be at the low level. Optionally, when the clock signal CLK is at a low level, the level value of the clock signal CLK is 0. Specifically, when the clock signal CLK and the data signal DIN signal are in a non-latching action, the clock signal CLK is set to be at a low level, and when the clock signal CLK is at the low level, even if an interference signal exists, the interference signal is difficult to pull the clock signal CLK from the low level to the high level, so that a false rising edge of the clock signal CLK caused by the influence of the interference signal can be avoided, further a false latching action is generated, thus an incorrect data can not be latched, the accuracy of latching the data is guaranteed, and a screen flash phenomenon caused by multiple latching is also avoided.
As a possible implementation manner, the high-level duty ratio of the clock signal CLK is smaller than a preset duty ratio threshold, and the preset duty ratio threshold is smaller than 50%, for example, the value range of the high-level duty ratio of the clock signal CLK may be 30% to 36%, and preferably may be 33%. The high-level duty ratio of the clock signal CLK refers to a ratio of a time length of the clock signal CLK at a high level to the entire time length of the clock signal CLK, or refers to a ratio of a time length of the clock signal CLK at a high level to a time length of the clock signal CLK at a low level. The data is latched by using a high-level duty ratio smaller than the clock signal CLK, so that the duration of the latched data is as short as possible, and the influence of interference signals in the latching process is prevented.
It should be noted that the driving apparatus for a Display screen shown in the embodiment of the present application can be applied to all circuits that drive a Display screen through an SPI bus, including an LED screen driving circuit, an LCD (Liquid Crystal Display) screen driving circuit, an OLED (Organic Light-Emitting Diode) screen driving circuit, and the like.
In summary, according to the driving apparatus of the display screen in the embodiment of the present invention, the control unit is connected to the driving unit through the serial peripheral interface bus, so that the control unit transmits the control signal to the driving unit, the filter circuit of the driving unit filters the control signal, and the driving circuit drives the display screen to display under the control of the filtered control signal, thereby solving the problem in the prior art that the display screen often flickers due to an interference signal, improving the display effect and the display quality of the display screen, and improving the product design quality.
Fig. 4 is a block schematic diagram of a driving system of a display panel according to an embodiment of the present invention. As shown in fig. 4, a driving system 1000 of a display panel according to an embodiment of the present invention includes: the display panel driving device 100 and the display panel 200 according to any embodiment of the present application.
According to the driving system of the display screen, disclosed by the embodiment of the invention, through the driving device of the display screen, the misoperation that the display screen always flickers due to interference signals in the prior art is solved, the display effect and the display quality of the display screen can be improved, and meanwhile, the product design quality can also be improved.
FIG. 5 is a block schematic diagram of an appliance according to an embodiment of the present invention. As shown in fig. 5, an electric appliance 10000 according to an embodiment of the present invention includes: the driving system 1000 of the display screen is described above.
The electric appliance of the embodiment of the invention solves the problem of misoperation that the display screen always flickers due to interference signals in the prior art through the driving system of the display screen, can improve the display effect and the display quality of the display screen, and can also improve the product design quality.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In addition, 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 disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.
Claims (7)
1. A driving apparatus of a display panel, comprising: the control unit is connected with the driving unit through a serial peripheral interface bus;
the control unit is used for transmitting a control signal to the driving unit;
the driving unit includes:
the filter circuit is used for filtering the control signal;
the driving circuit is used for driving the display screen to display under the control of the filtered control signal;
the communication interval time between the control unit and the driving unit is greater than a preset interval time threshold;
the interval time threshold is equal to or greater than 90 milliseconds;
the communication frequency between the control unit and the driving unit is smaller than a preset frequency threshold;
the frequency threshold is equal to or less than 110 KHZ;
the control signal comprises a clock signal CLK and a data signal DIN, wherein the clock signal CLK is used for triggering the driving unit to latch the data signal DIN;
the high-level duty cycle of the clock signal CLK is smaller than a preset duty cycle threshold, and the duty cycle threshold is smaller than 50%.
2. The driving apparatus according to claim 1, wherein the control signals include at least two kinds of signals, and the number of the filter circuits is equal to the number of the control signals;
the filter circuit is used for filtering the corresponding control signal.
3. The driving apparatus as claimed in claim 1, wherein the control signal comprises a strobe signal STB and a data signal DIN;
the strobe signal STB is at a low level when the control unit communicates with the driving unit, so that the driving unit receives the data signal DIN;
the strobe signal STB is pulled high at the end of each communication between the control unit and the driving unit, so that the driving unit stops receiving the data signal DIN.
4. The driving apparatus according to claim 3, wherein the control signal comprises a clock signal CLK;
when the clock signal CLK has a rising edge and maintains a high level, triggering the driving unit to latch the data signal DIN;
when the clock signal CLK is low, the driving unit stops latching the data signal DIN.
5. The driving apparatus according to claim 4, wherein the clock signal CLK is set to a low level when the driving unit stops latching the data signal DIN.
6. A driving system for a display panel, comprising: display screen and driving device for a display screen according to any of claims 1-5.
7. An electrical appliance, comprising: a drive system for a display screen according to claim 6.
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| CN201911035412.8A CN112820235B (en) | 2019-10-29 | 2019-10-29 | Electric appliance, driving device and driving system of display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911035412.8A CN112820235B (en) | 2019-10-29 | 2019-10-29 | Electric appliance, driving device and driving system of display screen |
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| CN112820235A CN112820235A (en) | 2021-05-18 |
| CN112820235B true CN112820235B (en) | 2022-04-12 |
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| CN209487136U (en) * | 2018-12-28 | 2019-10-11 | 深圳Tcl新技术有限公司 | A kind of subregion backlight drive circuit, device and television set |
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| CN2786743Y (en) * | 2004-12-24 | 2006-06-07 | 李勇 | Improved digital display screen module |
| CN201994043U (en) * | 2010-12-29 | 2011-09-28 | 康佳集团股份有限公司 | Multipath RS-232 interface circuit of LED display screen |
| CN102194410B (en) * | 2011-06-30 | 2013-01-16 | 郑州朗睿科技有限公司 | Synchronous display drive control method of OLED (organic light-emitting diode) display device |
| CN106875905B (en) * | 2017-01-04 | 2019-03-26 | 京东方科技集团股份有限公司 | A kind of driving method of display panel, driving circuit and display device |
| CN107301138B (en) * | 2017-06-01 | 2019-05-17 | 深圳震有科技股份有限公司 | A kind of universal serial bus bridging method and serial bus system |
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- 2019-10-29 CN CN201911035412.8A patent/CN112820235B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104778916A (en) * | 2014-12-02 | 2015-07-15 | 深圳市视维科技有限公司 | All-character LED nixie tube display driving circuit |
| CN209487136U (en) * | 2018-12-28 | 2019-10-11 | 深圳Tcl新技术有限公司 | A kind of subregion backlight drive circuit, device and television set |
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