CN115331613A - Driving circuit, driving method and display device - Google Patents
Driving circuit, driving method and display device Download PDFInfo
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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
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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
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Abstract
The application belongs to the field of display, concretely relates to drive circuit, drive method and display device, drive circuit include interconnect's control chip and driver chip, drive circuit still includes sampling module and processing module, and sampling module is used for gathering driver chip output current converts first voltage into, and processing module includes comparing unit, analysis unit and compensating unit, comparing unit is used for comparing first voltage and threshold voltage, analysis unit is used for the analysis comparing result of comparing unit, compensating unit is used for the basis analyzing unit's analysis result is updated compensation parameter exports control chip, and control chip is according to the compensation parameter control driver chip after the update, updates the output current that driver chip generated, makes its ideal drive current that approaches light-emitting chip, can eliminate obvious bright and dark line, reacts on the display panel, can improve or eliminate regional luminous inhomogeneous phenomenon, promotes the demonstration picture quality.
Description
Technical Field
The application belongs to the field of display, and particularly relates to a driving circuit, a driving method and a display device.
Background
When a Mini light emitting diode (Mini/Micro LED) display panel displays a picture with the same gray scale, theoretically, the brightness generated by each Mini light emitting diode is the same, but actually, each Mini light emitting diode has a difference due to the process and the like. When the driving device drives one or more rows or one or more columns of mini light emitting diodes, bright and dark lines exist, which are reflected on the display panel, and the phenomenon of non-uniform area light emission (i.e. mura) is formed, thereby affecting the display effect.
Disclosure of Invention
The present disclosure is directed to a driving circuit, a driving method and a display device, so as to improve or eliminate display non-uniformity and improve display quality.
In order to achieve the above object, the present application provides a driving circuit, including a control chip and a driving chip connected to each other, where the control chip is configured to control the driving chip according to a compensation parameter, and the driving chip is configured to generate an output current to drive a light emitting chip, and the driving circuit further includes:
the sampling module is used for collecting the output current of the driving chip and converting the output current into a first voltage;
the processing module comprises a comparison unit, an analysis unit and a compensation unit, wherein the comparison unit is used for comparing the first voltage with a threshold voltage, the analysis unit is used for analyzing a comparison result of the comparison unit, and the compensation unit is used for updating the compensation parameter according to the analysis result of the analysis unit and the first voltage and outputting the compensation parameter to the control chip.
Optionally, the compensation unit includes a converter and a compensator, the compensator is configured to compensate the first voltage according to the analysis result of the analysis unit and the first voltage to generate a second voltage, and the converter converts the second voltage into the compensation parameter and outputs the compensation parameter to the control chip.
Optionally, the comparing unit includes a comparator, the comparator includes a non-inverting input terminal, an inverting input terminal, and an output terminal, the first voltage is output to the inverting input terminal, the threshold voltage is output to the non-inverting input terminal, the comparison result is output to the analyzing unit, and the comparison result is a square wave signal.
Optionally, the sampling module includes a resistor, and the first voltage is equal to a voltage across the resistor.
The present application also provides a driving method, including:
collecting output current of a driving chip and converting the output current into first voltage;
comparing the first voltage with a threshold voltage and outputting a comparison result;
comparing the comparison result with a preset condition;
and when the comparison result meets the preset condition, updating the compensation parameter according to the first voltage and outputting the compensation parameter to a control chip.
Optionally, when it is determined that the comparison result meets the preset condition, updating the compensation parameter according to the first voltage includes:
when the comparison result meets the preset condition, updating the compensation count;
selecting a compensation coefficient according to a preset corresponding relation to compensate the first voltage to generate a second voltage, wherein the preset corresponding relation is the corresponding relation between the compensation times and the compensation coefficient;
and converting the second voltage into the compensation parameter and outputting the compensation parameter to the control chip.
Optionally, the compensating unit stores a plurality of compensation times and a plurality of compensation coefficients, the compensation times and the compensation coefficients correspond to each other one to form the preset corresponding relationship, and the selecting a compensation coefficient according to the preset corresponding relationship to compensate the first voltage to generate the second voltage includes:
when the compensation count is equal to one of the compensation times, the compensation coefficient corresponding to the compensation time is selected to be multiplied by the first voltage to compensate the first voltage.
Optionally, the performing compensation count update includes:
the compensation count is incremented by 1 or decremented by 1.
Optionally, the comparison result is a square wave signal, and the preset condition is that the duty ratio of the square wave signal is greater than 1% or the number of the square wave signals in one frame is greater than 5.
The present application also provides a display device, including:
a light emitting chip;
and the driving chip of the driving circuit is connected with the light-emitting chip.
The driving circuit, the driving method and the display device have the following beneficial effects:
in the application, the control chip is used for controlling the driving chip according to the compensation parameters, the driving chip is used for generating the output current to drive the light-emitting chip, the sampling module is used for collecting the output current of the driving chip and converting the output current into the first voltage, the processing module comprises a comparison unit, an analysis unit and a compensation unit, the comparison unit is used for comparing the first voltage with the threshold voltage, the analysis unit is used for analyzing the comparison result of the comparison unit, for example, the first voltage exceeds the threshold voltage, the compensation unit compensates on the basis of the first voltage and updates the compensation parameters, the updated compensation parameters are output to the control chip, the control chip controls the driving chip according to the updated compensation parameters, the output current generated by the driving chip is improved, and the driving chip is enabled to approach to the ideal driving current of the light-emitting chip. When the driving chip drives one or more lines of mini light-emitting diodes, obvious bright and dark lines can be eliminated and reflected to the display panel, the phenomenon of uneven regional light emission can be improved or eliminated, and the display image quality is improved.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a driving circuit according to a first embodiment of the present application.
Fig. 2 is a schematic structural diagram of a processing module according to an embodiment of the present application.
Fig. 3 is a flowchart of a driving method in the second embodiment of the present application.
Fig. 4 is a comparison graph of output currents of the driving chips before and after compensation in the second embodiment of the present application.
Fig. 5 is a waveform diagram of a first voltage in the second embodiment of the present application.
Fig. 6 is a schematic diagram of a square wave signal output by the comparing unit in the second embodiment of the present application.
Fig. 7 is a corresponding relationship between the number of compensation times and the compensation coefficient in the second embodiment of the present application.
Fig. 8 is a schematic structural diagram of a display device according to a third embodiment of the present application.
Description of the reference numerals:
100. a control chip;
200. a driver chip;
300. a sampling module;
400. a processing module;
410. a comparison unit; 420. an analysis unit; 430. a compensation unit;
431. a compensator; 432. a converter;
500. a light emitting chip.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the embodiments of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The present application will be described in further detail with reference to the following drawings and specific examples. It should be noted that the technical features mentioned in the embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
Example one
Referring to fig. 1 and 2, the driving circuit in this embodiment includes a control chip 100 and a driving chip 200 connected to each other, the control chip 100 is configured to control the driving chip 200 according to a compensation parameter, and the driving chip 200 is configured to generate an output current to drive a light emitting chip, where the light emitting chip includes a mini light emitting diode.
The driving circuit further includes a sampling module 300 and a processing module 400, wherein the sampling module 300 is configured to collect an output current of the driving chip 200 and convert the output current into a first voltage. The processing module 400 includes a comparing unit 410, an analyzing unit 420, and a compensating unit 430, wherein the comparing unit 410 is configured to compare the first voltage with the threshold voltage, the analyzing unit 420 is configured to analyze a comparison result of the comparing unit 410, and the compensating unit 430 is configured to update a compensation parameter according to the analysis result of the analyzing unit 420 and the first voltage and output the compensation parameter to the control chip 100.
It should be noted that the light emitting chip includes a mini light emitting diode, but is not limited thereto, and the light emitting chip may also include a light emitting diode, an organic light emitting diode, and the like, as the case may be. The light emitting chip includes a mini light emitting diode, the mini light emitting diode is driven by current, and the sampling module 300 is configured to collect an output current of the driving chip 200, but not limited thereto, when the light emitting chip is driven by voltage, the sampling module 300 may be configured to collect an output voltage of the driving chip 200, as the case may be.
Since each mini led has a certain difference, the ideal driving current and the actual driving current of the mini led also have a difference, and the output current of the driving chip 200 is difficult to be adapted to each mini led. Meanwhile, the driving current has a certain line loss, and the output current of the driving chip 200 is usually smaller than the ideal driving current of the mini light emitting diode, and this embodiment only takes increasing the output current of the driving chip 200 as an example for illustration, and when the output current of the driving chip 200 is larger than the ideal driving current of the mini light emitting diode, the output current of the driving chip 200 may also be correspondingly reduced, and therefore, details are not repeated.
In this embodiment, the control chip 100 is configured to control the driving chip 200 according to the compensation parameter, the driving chip 200 is configured to generate an output current to drive the light emitting chip, the sampling module 300 is configured to collect an output current of the driving chip 200 and convert the output current into a first voltage, the processing module 400 includes a comparing unit 410, an analyzing unit 420, and a compensating unit 430, the comparing unit 410 is configured to compare the first voltage with a threshold voltage, the analyzing unit 420 is configured to analyze a comparison result of the comparing unit 410, for example, the first voltage is smaller than the threshold voltage, the compensating unit 430 performs compensation on the basis of the first voltage and updates the compensation parameter, and then outputs the updated compensation parameter to the control chip 100, and the control chip 100 controls the driving chip 200 according to the updated compensation parameter, so as to increase the output current generated by the driving chip 200 and make the output current approach to an ideal driving current of the light emitting chip. When the driving chip 200 drives one or more lines of mini light emitting diodes, the obvious bright and dark lines can be eliminated and reflected on the display panel, thereby improving or eliminating the phenomenon of uneven regional light emission and improving the display image quality.
For example, referring to fig. 1 and 2, the sampling module 300 includes a resistor, and the first voltage is equal to a voltage across the resistor. The output current of the driving chip 200 is collected through the resistor, and the output current of the driving chip 200 is converted into a voltage across the resistor, i.e., a first voltage.
It should be noted that the mini light emitting diode is driven by current, the sampling module 300 is configured to collect the output current of the driving chip 200 and convert the output current into a first voltage, and the first voltage is used for comparing with a threshold voltage, but the sampling module 300 is not limited to this, and may also directly collect the output current of the driving chip 200, and the comparing unit 410 is configured to compare the output current of the driving chip 200 with the threshold current, which may be determined as the case may be.
The sampling module 300 includes a resistor, collects the output current of the driving chip 200 through the resistor, and simultaneously converts the output current of the driving chip 200 into a voltage across the resistor, i.e., a first voltage, and the comparing unit 410 compares the first voltage with a threshold voltage, and compensates the first voltage when the first voltage is smaller than the threshold voltage, compared with directly comparing the output current of the driving chip 200 with the threshold current, the current is converted into a voltage for comparison, which is easier to implement, and the circuit structure is also simpler.
Referring to fig. 1 and 2, the comparing unit 410 includes a non-inverting input terminal, an inverting input terminal, and an output terminal, the non-inverting input terminal is connected to a voltage source, and the voltage source is connected to provide a threshold voltage; the inverting input terminal is connected with the sampling module 300, and the sampling module 300 outputs a first voltage to the inverting input terminal; the output terminal is connected to the analyzing unit 420, and the comparison result is output to the analyzing unit 420. The comparing unit 410 includes a comparator, and the comparison result output by the comparator is a square wave signal.
It should be noted that, when the sampling module 300 outputs the first voltage, the comparing unit 410 may include a comparator, but is not limited thereto, and the comparing unit 410 may also include an operational amplifier, as the case may be. When the sampling module 300 directly collects the output current of the driving chip 200, the comparing unit 410 may also be configured to compare the output current of the driving chip 200 with the threshold current, as the case may be.
The comparison unit 410 compares the first voltage with the threshold voltage, and converts the current into the voltage for comparison, which is easier to implement and has a simpler circuit structure, than directly comparing the output current of the driving chip 200 with the threshold current. In addition, when the sampling module 300 outputs the first voltage, the comparing unit 410 may include a comparator that compares the first voltage with a threshold voltage, and the comparator is designed as a high-speed switch, and has a faster slew rate and a shorter delay than the operational amplifier, compared to comparing the first voltage with the threshold voltage using the operational amplifier.
Referring to fig. 1 and 2, the compensation unit 430 includes a compensator 431 and a converter 432, the compensator 431 is used for compensating the first voltage according to the analysis result of the analysis unit 420 and the first voltage to generate a second voltage, and the converter 432 converts the second voltage into a compensation parameter and outputs the compensation parameter to the control chip 100. The compensation parameter is a digital signal, the first voltage and the second voltage are analog signals, the converter 432 converts the second voltage into a compensation current, and then performs digital-to-analog conversion to generate the compensation parameter, the control chip 100 controls the driving chip 200 according to the compensation parameter, so as to increase the output current generated by the driving chip 200, and make the output current approach to the ideal driving current of the light emitting chip.
It should be noted that, the converter 432 converts the second voltage into a compensation current, and then performs digital-to-analog conversion to generate a compensation parameter, and the control chip 100 controls the driving chip 200 according to the compensation parameter, but is not limited thereto, when the sampling module 300 directly collects the output current of the driving chip 200, the comparing unit 410 is configured to compare the output current of the driving chip 200 with the threshold current, and the compensator 431 is used for compensating the output current of the driving chip 200 to generate a compensation current, and then performs digital-to-analog conversion to generate a compensation parameter, which may be determined as the case may be.
The compensator 431 is configured to compensate the first voltage according to the analysis result of the analysis unit 420 and the first voltage to generate a second voltage, the converter 432 converts the second voltage into a compensation current, performs digital-to-analog conversion to generate a compensation parameter, outputs the compensation parameter to the control chip 100, and adjusts the output current generated by the driving chip 200 in real time to make the output current approach to an ideal driving current of the light emitting chip, so that the phenomenon of uneven light emission can be rapidly eliminated, an obvious bright and dark line can be prevented from being observed by human eyes, and display image quality can be improved.
Example two
Referring to fig. 3, the driving method in this embodiment includes the following steps:
s100: collecting the output current of the driving chip 200 and converting the output current into a first voltage;
s200: comparing the first voltage with a threshold voltage and outputting a comparison result;
s300: comparing the comparison result with a preset condition;
s400: when the comparison result is confirmed to satisfy the preset condition, the compensation parameter is updated according to the first voltage and is output to the control chip 100.
In the first embodiment, the driving circuit is used for executing the driving method in the present embodiment, wherein the sampling module 300 collects the output current of the driving chip 200 and converts the output current into a first voltage, the comparing unit 410 compares the first voltage with a threshold voltage and outputs a comparison result, the analyzing unit 420 compares the comparison result with a preset condition and determines whether the comparison result meets the preset condition, when it is determined whether the comparison result meets the preset condition, the compensating unit 430 updates a compensation parameter according to the first voltage and outputs the compensation parameter to the control chip 100, the control chip 100 controls the driving chip 200 according to the updated compensation parameter, and the output current generated by the driving chip 200 is increased to make the output current approach to the ideal driving current of the light emitting chip. Referring to fig. 4, before compensation, the output current of the driving chip 200 deviates from the ideal driving current, and after compensation, the output current of the driving chip 200 approaches the ideal driving current. When the driving chip 200 drives one or more rows of mini light emitting diodes, the obvious bright and dark lines can be eliminated and reflected to the display panel, thereby improving or eliminating the phenomenon of uneven regional light emission and improving the display image quality.
When it is determined in step S400 that the comparison result satisfies the preset condition, updating the compensation parameter according to the first voltage includes:
when the comparison result meets the preset condition, updating the compensation count;
selecting a compensation coefficient according to a preset corresponding relation to compensate the first voltage to generate a second voltage, wherein the preset corresponding relation is the corresponding relation between the compensation times and the compensation coefficient;
and converting the second voltage into a compensation parameter and outputting the compensation parameter to the control chip.
The compensation unit 430 includes a compensator 431 and a converter 432, the compensator 431 selects a compensation coefficient according to a preset corresponding relationship to compensate the first voltage to generate a second voltage, and the converter 432 converts the second voltage into a compensation current, performs a digital-to-analog conversion to generate a compensation parameter, and outputs the compensation parameter to the control chip 100.
When the comparison result meets the preset condition, the compensation counting is updated, the compensator 431 compensates the first voltage according to the preset corresponding relationship to generate a second voltage, the converter 432 converts the second voltage into a compensation current, and then performs digital-to-analog conversion to generate a compensation parameter and outputs the compensation parameter to the control chip 100, the control chip 100 controls the driving chip 200 according to the updated compensation parameter, and increases the output current generated by the driving chip 200, because the sampling module 300 continuously samples the output current, the comparator continuously compares the first voltage with the threshold voltage, when the analysis unit 420 confirms that the comparison result meets the preset condition, the compensation counting is updated again, the compensation unit 430 compensates the first voltage again and updates the second voltage and the compensation parameter until the comparison result does not meet the preset condition, at this time, the first voltage does not exceed the threshold voltage, and the output current of the driving chip 200 approaches the ideal driving current.
The waveform of the first voltage is shown in fig. 5, and the comparing unit 410 includes a comparator that compares the first voltage with a threshold voltage and outputs a square wave signal, as shown in fig. 6. The analysis unit 420 compares the comparison result with a preset condition and confirms whether the comparison result satisfies the preset condition. The preset condition is that the duty ratio of the square wave signals is more than 1% or the number of the square wave signals in one frame is more than 5.
The square wave signal output by the comparator meets one of two conditions that the duty ratio is greater than 1% or the number of the square wave signals in one frame is greater than 5, which indicates that the first voltage exceeds the threshold voltage, and meanwhile, the difference between the output current of the driving chip 200 and the ideal driving current is large, so that the output current of the driving chip 200 needs to be compensated again. Whether the first voltage exceeds the threshold voltage and the difference between the output current of the driving chip 200 and the ideal driving current are indirectly judged by analyzing whether the square wave signal output by the comparator meets the preset condition, so that the judgment mode is simpler and is easier to implement.
In some embodiments, the compensating unit 430 stores a plurality of compensation times and a plurality of compensation coefficients, the compensation times and the compensation coefficients form a preset correspondence one to one, and the selecting the compensation coefficients according to the preset correspondence to compensate the first voltage to generate the second voltage includes:
and when the compensation count is equal to one of the compensation times, selecting a compensation coefficient corresponding to the compensation time to be multiplied by the first voltage to compensate the first voltage.
For example, the corresponding relationship between the compensation times and the compensation coefficients is shown in fig. 7, the compensation times are integers from 1 to 8, and the compensation coefficients are X, 5X, 10X, 15X, 20X, 25X, 30X, and 35X, where X is greater than 0.
When the comparison result meets the preset condition, updating the compensation count, when the compensation count is 1, the compensation coefficient is X, the compensation coefficients are different, and the compensation unit 430 selects different resistors to compensate the first voltage to generate a second voltage, wherein the second voltage is X times of the first voltage; when the analysis unit 420 confirms again that the comparison result satisfies the preset condition, the second voltage is 5X times the first voltage when the compensation count is 2.
When the compensation count is equal to one of the compensation times, the compensation coefficient corresponding to the compensation time is selected to be multiplied by the first voltage to compensate the first voltage to generate a second voltage, the first voltage is compensated in multiples, the speed of the output current of the driving chip 200 approaching to the ideal driving current is faster, the phenomenon of uneven light emission can be rapidly eliminated, obvious bright and dark lines observed by human eyes are avoided, and the display image quality is improved.
In some embodiments, performing the compensation count update includes incrementing the compensation count by 1, that is, incrementing the compensation count by 1 each time the analysis unit 420 confirms that the comparison result satisfies the preset condition. The compensation count corresponds to the compensation coefficient, and after the compensation count is updated, when the first voltage is compensated, the compensation unit 430 selects the compensation coefficient corresponding to the compensation count to compensate accordingly.
Note that, the updating of the offset count includes adding 1 to the offset count, but the updating of the offset count is not limited to this, and the updating of the offset count may include adding 1 to the offset count.
When the comparison result meets the preset condition, updating the compensation count, and adding 1 to the compensation count each time, that is, during compensation, sequentially selecting the compensation coefficients X, 5X, 10X, 15X, 20X, 25X, 30X and 35X to compensate the first voltage, so that the first voltage is gradually increased, and further, the output current of the driving chip 200 is gradually increased to approximate to the ideal driving current. When the comparison result meets the preset condition, the compensation count is updated, and the compensation count is decremented by 1 each time, that is, the compensation coefficients 35X, 30X, 25X, 20X, 15X, 10X, 5X and X are selected in sequence during compensation to compensate the first voltage, so that the first voltage is gradually decreased, and the output current of the driving chip 200 can also be gradually decreased to approximate to the ideal driving current.
EXAMPLE III
Referring to fig. 8, the display device in this embodiment includes a light emitting chip 500 and a driving circuit, the driving circuit includes a driving circuit in the first embodiment, and the driving chip 200 of the driving circuit is connected to the light emitting chip 500.
It should be noted that the light emitting chip 500 includes a mini light emitting diode, but is not limited thereto, and the light emitting chip 500 may further include a light emitting diode, an organic light emitting diode, and the like, as the case may be.
The display device includes a driving circuit in the first embodiment, in which the control chip 100 is configured to control the driving chip 200 according to the compensation parameter, the driving chip 200 is configured to generate an output current to drive the light emitting chip 500, the sampling module 300 is configured to collect an output current of the driving chip 200 and convert the output current into a first voltage, the processing module 400 includes a comparing unit 410, an analyzing unit 420, and a compensating unit 430, the comparing unit 410 is configured to compare the first voltage with a threshold voltage, the analyzing unit 420 is configured to analyze a comparison result of the comparing unit 410, for example, the first voltage is smaller than the threshold voltage, the compensating unit 430 performs compensation and updates a compensation parameter on the basis of the first voltage, and then outputs the updated compensation parameter to the control chip 100, and the control chip 100 controls the driving chip 200 according to the updated compensation parameter, so as to increase the output current generated by the driving chip 200, and make the output current approach an ideal driving current of the light emitting chip 500. When the driving chip 200 drives one or more rows of mini light emitting diodes, the obvious bright and dark lines can be eliminated and reflected on the display panel, thereby improving or eliminating the phenomenon of uneven regional light emission and improving the image quality of the display device.
The terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the application. 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.
Although embodiments of the present application have been shown and described, it is understood that the above embodiments are illustrative and should not be construed as limiting the present application and that various changes, modifications, substitutions and alterations can be made therein by those skilled in the art within the scope of the present application, and therefore all changes and modifications that come within the meaning of the claims and the description of the invention are to be embraced therein.
Claims (10)
1. A kind of drive circuit, including control chip and driver chip connected each other, the said control chip is used for controlling the driver chip according to the compensation parameter, the said driver chip is used for producing the output current and driving the luminescent chip, characterized by that, the said drive circuit also includes:
the sampling module is used for collecting the output current of the driving chip and converting the output current into a first voltage;
and the processing module comprises a comparison unit, an analysis unit and a compensation unit, wherein the comparison unit is used for comparing the first voltage with a threshold voltage, the analysis unit is used for analyzing a comparison result of the comparison unit, and the compensation unit is used for updating the compensation parameter according to the analysis result of the analysis unit and the first voltage and outputting the compensation parameter to the control chip.
2. The driving circuit according to claim 1, wherein the compensation unit comprises a converter and a compensator, the compensator is configured to compensate the first voltage according to the analysis result of the analysis unit and the first voltage to generate a second voltage, and the converter converts the second voltage into the compensation parameter and outputs the compensation parameter to the control chip.
3. The driving circuit according to claim 2, wherein the comparing unit comprises a comparator including a non-inverting input terminal, an inverting input terminal, and an output terminal, the first voltage is output to the inverting input terminal, the threshold voltage is output to the non-inverting input terminal, the comparison result is output to the analyzing unit, and the comparison result is a square wave signal.
4. The driving circuit of claim 1, wherein the sampling module comprises a resistor, and wherein the first voltage is equal to a voltage across the resistor.
5. A driving method, characterized by comprising:
collecting output current of a driving chip and converting the output current into first voltage;
comparing the first voltage with a threshold voltage and outputting a comparison result;
comparing the comparison result with a preset condition;
and when the comparison result meets the preset condition, updating the compensation parameter according to the first voltage and outputting the compensation parameter to a control chip.
6. The driving method according to claim 5, wherein the updating a compensation parameter according to the first voltage when the comparison result satisfies a preset condition comprises:
when the comparison result meets the preset condition, updating the compensation count;
selecting a compensation coefficient according to a preset corresponding relation to compensate the first voltage to generate a second voltage, wherein the preset corresponding relation is the corresponding relation between the compensation times and the compensation coefficient;
and converting the second voltage into the compensation parameter and outputting the compensation parameter to the control chip.
7. The driving method according to claim 6, wherein the compensation unit stores a plurality of the compensation times and a plurality of the compensation coefficients, the compensation times and the compensation coefficients form the preset correspondence relationship in a one-to-one correspondence, and the selecting a compensation coefficient according to a preset correspondence relationship to compensate the first voltage to generate the second voltage includes:
when the compensation count is equal to one of the compensation times, the compensation coefficient corresponding to the compensation time is selected to be multiplied by the first voltage, and the first voltage is compensated.
8. The driving method according to claim 6, wherein the performing of the compensation count update includes:
the compensation count is incremented by 1 or decremented by 1.
9. The driving method according to claim 5, wherein the comparison result is a square wave signal, and the preset condition is that a duty ratio of the square wave signal is greater than 1% or a number of the square wave signals in one frame is greater than 5.
10. A display device, comprising:
a light emitting chip;
the driving circuit according to any one of claims 1 to 4, wherein a driving chip of the driving circuit is connected to the light emitting chip.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210976519.8A CN115331613A (en) | 2022-08-15 | 2022-08-15 | Driving circuit, driving method and display device |
| PCT/CN2022/143457 WO2024036869A1 (en) | 2022-08-15 | 2022-12-29 | Driving circuit, driving method, and display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210976519.8A CN115331613A (en) | 2022-08-15 | 2022-08-15 | Driving circuit, driving method and display device |
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| CN115331613A true CN115331613A (en) | 2022-11-11 |
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| CN202210976519.8A Pending CN115331613A (en) | 2022-08-15 | 2022-08-15 | Driving circuit, driving method and display device |
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| CN (1) | CN115331613A (en) |
| WO (1) | WO2024036869A1 (en) |
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| WO2024036869A1 (en) * | 2022-08-15 | 2024-02-22 | 惠科股份有限公司 | Driving circuit, driving method, and display apparatus |
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