CN113674661B - Debugging circuit, debugging method and device for reference voltage of display module - Google Patents
Debugging circuit, debugging method and device for reference voltage of display module 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
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
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Abstract
The application relates to a debugging circuit, a debugging method and a debugging device of display module reference voltage, wherein the debugging circuit of the display module reference voltage comprises an initial voltage generation module, a control module, a compensation module and a feed-in module, the initial voltage generation module comprises a feedback end and a first output end, the feedback end is respectively and electrically connected with the output end of the compensation module and the input end of the feed-in module, the first output end is respectively and electrically connected with the output end of the feed-in module and a VCOM electrode of the display module, and the input end of the compensation module is electrically connected with the control module. According to the method and the device, the problem of poor compensation adaptability to the reference voltage of the display module in the related technology is solved, and the continuous public-level compensation voltage is generated by utilizing software control, so that the public-level voltage compensation beneficial effects applicable to different display modules are realized.
Description
Technical Field
The application relates to the technical field of screen public level voltage regulation, in particular to a debugging circuit, a debugging method and a debugging device for reference voltage of a display module.
Background
Along with the development of display technology, people have higher and higher display effects on display panels and display modules. In order to achieve better display effect, reference Voltage (VCOM) compensation through a display panel or a display module is often used to adjust the display effect of the panel. Meanwhile, due to the difference generated in the preparation process of the glass panel of the display panel, the display module needs to compensate the reference voltage of the display module.
In the related art, a common voltage output circuit, a display device and a common voltage compensation method are adopted, the common stage is compensated by controlling a compensation voltage output module, and different resistors are controlled in the compensation voltage output module through MOS switching tubes and connected in series to generate compensation voltage for power supply voltage division. However, in the related art, the compensation voltage value generated by the voltage division has a certain limitation, and there is a mismatch between the compensation voltage generated by the voltage division and the display module, or a non-optimal compensation voltage, which results in poor display effect of the display module.
At present, no effective solution is proposed for the problem of poor compensation adaptability to the reference voltage of the display module in the related art.
Disclosure of Invention
The embodiment of the application provides a debugging circuit, a debugging method and a debugging device for reference voltage of a display module, which are used for at least solving the problem of poor compensation adaptability of the reference voltage of the display module in the related technology.
In a first aspect, an embodiment of the present application provides a debug circuit of a reference voltage of a display module, including an initial voltage generating module, a control module, a compensation module and a feed-in module, where the initial voltage generating module includes a feedback end and a first output end, the feedback end is electrically connected with an output end of the compensation module and an input end of the feed-in module, the first output end is electrically connected with an output end of the feed-in module and a VCOM electrode of the display module, and an input end of the compensation module is electrically connected with the control module, where the initial voltage generating module is configured to generate an initial reference voltage when the feedback end is connected with a preset level, and output the initial reference voltage to the VCOM electrode through the first output end; the control module is used for generating a pulse signal with a preset duty ratio and outputting the pulse signal to the compensation module; the compensation module is used for generating continuous compensation current according to the received pulse signal and the preset level loaded at the output end of the compensation module, and outputting the compensation current to the feed-in module; the feed-in module is used for generating continuous compensation voltage according to the received compensation current and feeding the compensation voltage to the first output end and the VCOM electrode.
In some embodiments, the compensation module includes a filtering unit and a compensation current generating unit, one end of the filtering unit is electrically connected with the control module, the other end of the filtering unit is electrically connected with the input end of the compensation current generating unit, the output end of the compensation current generating unit is electrically connected with the feedback end and is pulled down to the ground through a constant current unit, wherein the constant current unit is used for generating a first constant current flowing out from the feedback end according to the preset level loaded by the feedback end; the filtering unit is used for processing the received pulse signal into a first direct current level and transmitting the first direct current level to the compensation current generating unit; the compensation current generation unit is used for calculating a first potential difference between the first direct current level and the preset level, generating a corresponding first feed current according to the first potential difference, and outputting the compensation current determined by the first feed current and the first constant current to the feed module; the feed-in module is used for generating the corresponding compensation voltage according to the compensation current.
In some embodiments, the filtering unit includes an RC filtering unit, the RC filtering unit includes a first resistor and a first capacitor, one end of the first resistor is connected to the control module, the other end of the first resistor is electrically connected to the compensation current generating unit and the first capacitor, respectively, and the other end of the first capacitor is grounded.
In some of these embodiments, the filtering unit comprises a low pass filter.
In some embodiments, the compensation current generating unit includes a second resistor and a third resistor connected in series, the second resistor is relatively far from one end electrically connected with the third resistor and is electrically connected with the filtering unit, and the third resistor is relatively far from one end electrically connected with the second resistor and is electrically connected with the feedback end and the constant current unit.
In some embodiments, the constant current unit includes a fourth resistor, one end of the fourth resistor is electrically connected to the feed-in module, the feedback end and the output end of the compensation current generating unit, and the other end of the fourth resistor is grounded, where the fourth resistor is used to pull down the feedback end, and the first constant current is determined according to the preset level and the fourth resistor.
In some embodiments, the feed-in module includes a current-to-voltage conversion circuit, an input terminal of the current-to-voltage conversion circuit is electrically connected to the feedback terminal, and an output terminal of the current-to-voltage conversion circuit is electrically connected to the first output terminal, where the current-to-voltage conversion circuit is configured to receive the compensation current and generate the compensation voltage according to the compensation current.
In some embodiments, the current-voltage conversion circuit includes a fifth resistor, wherein one end of the fifth resistor is electrically connected to the feedback end, the constant current unit and the compensation current generation unit, and the other end of the fifth resistor is electrically connected to the first output end, and the compensation voltage is determined according to the fifth resistor and the compensation current.
In some of these embodiments, the current-to-voltage conversion circuit includes a transimpedance amplifier.
In some embodiments, the initial voltage generation module includes a dc voltage converter including a first reference terminal, the feedback terminal, and the first output terminal, the first reference terminal being electrically connected to a first power source, wherein the feedback terminal and the first reference terminal are configured to be equal in potential; the first reference terminal, upon receiving a level provided by the first power supply, the feedback terminal being configured to load the preset level; the direct current voltage converter is used for generating the initial reference voltage when the feedback end loads the preset level, and outputting the initial reference voltage to the VCOM electrode through the first output end.
In a second aspect, an embodiment of the present application provides a method for debugging a reference voltage, including a circuit for debugging a reference voltage of a display module set according to the first aspect, where the method includes: the control module obtains the initial reference voltage output by the initial voltage generation module to the VCOM electrode and the reference voltage required by the VCOM electrode, calculates the compensation voltage to be fed in according to the reference voltage and the initial reference voltage, and transmits the pulse signal to the compensation module after generating the pulse signal with a preset duty ratio according to the compensation voltage; the compensation module generates a corresponding second direct current level according to the level of the pulse signal and a preset duty ratio after receiving the pulse signal, generates a corresponding compensation current according to the second direct current level and the acquired preset level, and transmits the compensation current to the feed-in module; the feed-in module generates the corresponding compensation voltage according to the compensation current and feeds the compensation voltage into the VCOM electrode.
In some of these embodiments, generating the corresponding compensation current from the second dc level and the acquired preset level includes: the compensation module obtains the preset level and generates a second constant current according to the preset level and a preset pull-down resistor, wherein the feedback end is grounded through the pull-down resistor, and the second constant current flows from the feedback end to the pull-down resistor; the compensation module obtains a second potential difference of the second direct current level corresponding to the preset level, and determines a second feedback current output to the feedback end according to the second potential difference and a preset current limiting resistor; the compensation module determines the compensation current according to the current difference corresponding to the second feed current and the second constant current.
In a third aspect, an embodiment of the present application provides a device for debugging a reference voltage of a display module, including a control board, where a debug circuit is provided on the control board, and the debug circuit is the debug circuit of the reference voltage of the display module in the first aspect.
Compared with the related art, the debugging circuit, the debugging method and the debugging device for the reference voltage of the display module provided by the embodiment of the application, wherein the debugging circuit for the reference voltage of the display module comprises an initial voltage generation module, a control module, a compensation module and a feed-in module, the initial voltage generation module comprises a feedback end and a first output end, the feedback end is respectively and electrically connected with the output end of the compensation module and the input end of the feed-in module, the first output end is respectively and electrically connected with the output end of the feed-in module and a VCOM electrode of the display module, the input end of the compensation module is electrically connected with the control module, and the initial voltage generation module is used for generating the initial reference voltage when the feedback end is in a preset level and outputting the initial reference voltage to the VCOM electrode through the first output end; the control module is used for generating a pulse signal with a preset duty ratio and outputting the pulse signal to the compensation module; the compensation module is used for generating continuous compensation current according to the received pulse signal and a preset level loaded at the output end of the compensation module, and outputting the compensation current to the feed-in module; the feed-in module is used for generating continuous compensation voltage according to the received compensation current, and feeding the compensation voltage to the first output end and the VCOM electrode, so that the problem of poor compensation suitability of the reference voltage of the display module in the related art is solved, the continuous common-stage compensation voltage is generated by utilizing software control, and the beneficial effect of common-stage voltage compensation applicable to different display modules is realized.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a block diagram of a debug circuit for a display module reference voltage according to an embodiment of the present application;
fig. 2 is a topology diagram of a debug circuit for a reference voltage of a display module according to a preferred embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described and illustrated below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments provided herein, are intended to be within the scope of the present application.
It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar terms herein do not denote a limitation of quantity, but rather denote the singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein refers to two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.
The embodiment provides a debug circuit of display module reference voltage, fig. 1 is a block diagram of the structure of the debug circuit of display module reference voltage according to the embodiment of the application, as shown in fig. 1, the debug circuit of display module reference voltage includes an initial voltage generating module 100, a control module 200, a compensation module 300 and a feed-in module 400, the initial voltage generating module 100 includes a feedback end and a first output end, the feedback end is respectively electrically connected with the output end of the compensation module 300 and the input end of the feed-in module 400, the first output end is respectively electrically connected with the output end of the feed-in module 400 and the VCOM electrode of the display module 500, the input end of the compensation module 300 is electrically connected with the control module 200, wherein,
the initial voltage generation module 300 is used for accessing a preset level V at the feedback end fb Generating an initial reference voltage V c And output to the VCOM electrode through the first output terminal.
In the present embodiment, the initial voltage generating module 100 further includes a reference terminal and a feedback terminal respectively configured as the same-directional input terminal and the opposite-directional input terminal of the initial voltage generating module 100, and at the same time, the reference terminal and the feedback terminal are configured to have equal potential based on the "virtual short" characteristic under ideal conditions, and thus, the corresponding level V is accessed at the reference terminal ref When the reference terminal is equivalent to the access preset level V fb Level V when reference terminal is accessed ref When it is constant, the corresponding feedback end presets level V fb Also constant, based on this characteristic, a preset level V is made available for access by the feedback terminal fb Constant, thereby completing the compensation voltage V 0 The control of the generation, while, in circuit logic, the initial voltage generation module 100 is configured such that the feedback access is at a preset level V fb And preset level V fb While maintaining constant, the first output terminal outputs a corresponding initial reference voltage V c The method comprises the steps of carrying out a first treatment on the surface of the In the present embodiment, the initial reference voltage V is generated c With the compensation voltage V generated in the present embodiment 0 Corresponds to the VCOM voltage constituting the display module 500.
The control module 200 is configured to generate a pulse signal with a preset duty ratio D, and output the pulse signal to the compensation module 300.
In the present embodiment, the control module 200 is built with a PWM module, and generates a corresponding pulse signal via the PWM module, and the duty ratio D of the output pulse signal and the level V of the pulse signal T The product of (2) is the dc level output by the PWM module, based on which the compensation module 300 can generate a corresponding compensation current.
The compensation module 300 is used for receiving pulse signals and loading a preset level V at the output end of the compensation module 300 fb Generating a continuous compensation current I 2 And outputs the compensation current I to the feed-in module 400 2 。
In this embodiment, the compensation module 300 processes the pulse signal into a dc level, and determines the current I output to the feedback terminal according to the potential difference between the dc level and the preset level of the feedback terminal 1-0 In the present embodiment, the compensation module 300 also generates a constant current I flowing from the feedback terminal to ground 3-0 Due to the preset level V of the feedback terminal fb The current flowing from the feedback terminal to the ground generated by the compensation module 300 is constant, and the compensation current I output from the feedback terminal to the feed-in module 400 can be determined based on kirchhoff's law 2 Wherein I 2 ＝I 1-0 +I 3-0 。
In the present embodiment, when the initial reference voltage V is required c When the voltage is compensated to debug the corresponding VCOM voltage, the DC level is configured to be larger than the preset level (the duty ratio D is reduced), that is, the potential difference between the DC level and the preset level of the feedback end is configured to be larger than zero, so that the feed current I 1-0 The current direction from the compensation module 300 to the feedback end; when it is required to be at the initial reference voltage V c Up-compensating negative voltages, i.eFor initial reference voltage V c When the corresponding VCOM voltage is regulated by attenuation, the DC level is set to be smaller than the preset level (the duty ratio D is increased), namely the potential difference between the DC level and the preset level at the feedback end is set to be smaller than zero, so that the feed current I 1-0 The current direction of (2) is the feedback end to the compensation module 300.
The feeding module 400 is used for receiving the compensation current I 2 Generating a continuous compensation voltage V 0 And feeding a compensation voltage V to the first output terminal and VCOM electrode 0 。
In this embodiment, the feeding module 400 may generate the corresponding compensation voltage V based on the corresponding resistance connected in series between the feedback terminal and the first output terminal according to ohm's law 0 The compensation current I can also be converted by a current-voltage converter 2 Converted into corresponding compensation voltage V 0 。
In the present embodiment, when the pulse signal output by the control module 200 changes such that the corresponding dc level increases, the preset level V fb Constant feed current I 1-0 Becomes larger and at the same time, constant current I 3-0 Constant, compensating current I 2 According to the compensation current I 2 The generated voltage becomes smaller at this time due to the preset level V fb Constant, compensating voltage V 0 Becoming smaller; when the pulse signal outputted by the control module 200 changes to decrease the corresponding DC level, the preset level V fb Constant feed current I 1-0 Becomes smaller and at the same time, constant current I 3-0 Constant, compensating current I 2 According to the compensation current I, the feed-in module 400 2 The generated voltage becomes large, at this time, due to the preset level V fb Constant, compensating voltage V 0 And becomes larger.
The debug circuit of this embodiment uses the preset level V of the feedback terminal fb After the control module 200 outputs the pulse with the preset duty ratio to the compensation module 300, the compensation module 300 uses the feedback terminal as the circuit node and generates the compensation current I with corresponding variation based on kirchhoff's law 2 And then is generated by the feed-in module 400The different compensation voltages solve the problem of poor compensation adaptability to the reference voltage of the display module in the related technology, and the continuous common-stage compensation voltage is generated by utilizing software control, so that the beneficial effect of common-stage voltage compensation applicable to different display modules is realized.
Fig. 2 is a topology structure diagram of a debug circuit of a reference voltage of a display module according to a preferred embodiment of the present application, and as shown in fig. 2, a compensation module 300 includes a filtering unit 301 and a compensation current generating unit 302, one end of the filtering unit 301 is electrically connected with the control module 200, the other end is electrically connected with an input terminal of the compensation current generating unit 302, an output terminal of the compensation current generating unit 302 is electrically connected with a feedback terminal, and is pulled down to the ground through a constant current unit 303, wherein,
the constant current unit 303 is used for loading a preset level V according to a feedback end fb Generating a first constant current I flowing from a feedback end 3-1 。
In the present embodiment, the level V is preset fb Constant, according to the constant current resistance set in the constant unit 303, the generated first constant current I 3-1 Constant.
The filtering unit 301 is configured to process the received pulse signal into a first dc level, and transmit the first dc level to the compensation current generating unit 302.
In the present embodiment, the first DC level V is calculated as follows pwm-1
V pwm-1 ＝V on ×D
Wherein V is on D is the duty cycle of the pulse signal, which is the high level of the pulse signal.
The compensation current generation unit 302 is used for calculating a first DC level V pwm-1 And a preset level V fb Corresponding first potential difference and generating corresponding first feed current I according to the first potential difference 1-1 Become larger and output a first feed current I to the feed module 400 1-1 And a first constant current I 3-1 Determined compensation current I 2 。
The feed-in module 400 is used for compensating the current I 2 Generating a corresponding compensation voltage V 0 。
In some embodiments, referring to fig. 2, the filtering unit 301 includes an RC filtering unit, where the RC filtering unit includes a first resistor R1 and a first capacitor C1, one end of the first resistor R1 is connected to the control module 200, the other end of the first resistor R1 is electrically connected to the compensation current generating unit 302 and the first capacitor C1, respectively, and the other end of the first capacitor C1 is grounded.
In this embodiment, the control module 200 outputs a PWM signal (square wave), the high level of the PWM signal reaches the first capacitor C1 after flowing through the first resistor R1, the first capacitor C1 is charged, and the first capacitor C1 is discharged during the time when the PWM signal is low level, so that the PWM signal is processed to the first dc level.
In some of these alternative embodiments, the filtering unit 301 comprises a low pass filter, for example: the filtering unit 301 may select a two-stage low-pass filter.
In some embodiments, referring to fig. 2, the compensation current generation unit 302 includes a second resistor R2 and a third resistor R3 connected in series, the second resistor R2 is electrically connected to the filtering unit 301 relatively far from an end electrically connected to the third resistor R3, and the third resistor R3 is electrically connected to the feedback end and the constant current unit 303 relatively far from an end electrically connected to the second resistor R2.
In the present embodiment, the compensation current generation unit 302 generates the first feed current I as follows 1-1
Wherein V is pwm-1 A first dc level, V, generated after processing the pulse signal for the filtering unit 301 fb Corresponding to the preset level of the feedback end.
In some embodiments, referring to fig. 2, the constant current unit includes a fourth resistor R4, one end of the fourth resistor R4 is electrically connected to the feed-in module 400, the feedback end and the output end of the compensation current generating unit 302, and the other end of the fourth resistor R4 is grounded, wherein the fourth resistor R4 is used for pulling down the feedback end, and the first constant current I 3-1 According to a predetermined level V fb And (d)Four resistors R4.
Specifically, in the present embodiment, the first constant current I is determined as follows 3-1
Wherein V is fb Corresponding to the preset level of the feedback end.
In some alternative embodiments, the feed-in module 400 includes a current-to-voltage conversion circuit having an input terminal electrically connected to the feedback terminal and an output terminal electrically connected to the first output terminal, wherein the current-to-voltage conversion circuit is configured to receive the compensation current I 2 And according to the compensation current I 2 Generating a compensation voltage V 0 。
In some embodiments, referring to fig. 2, the current-voltage conversion circuit includes a fifth resistor R5, wherein one end of the fifth resistor R5 is electrically connected to the feedback terminal, the constant current unit 303, and the compensation current generating unit 302, respectively, and the other end of the fifth resistor R5 is electrically connected to the first output terminal, wherein the compensation voltage V 0 According to a fifth resistor R5 and a compensation current I 2 And (5) determining.
In this embodiment, there is according to kirchhoff's law: i 2 ＝I 1-1 +I 3-1 Wherein,
the method comprises the following steps:
according to the initial voltage generation module 100, the feedback and reference terminals are configured to be equal in potential, i.e., according to the "virtual short" characteristic, V fb ＝V ref Therefore, in the applicationIn the embodiment, the supplementary voltage is calculated as follows:
wherein V is ref Is the voltage configured at the reference terminal of the initial voltage generation module 100.
In some of these alternative embodiments, the current-to-voltage conversion circuit includes, but is not limited to, a transimpedance amplifier.
In some of these embodiments, the initial voltage generation module 100 includes a dc voltage converter including a first reference terminal, a feedback terminal, and a first output terminal, the first reference terminal being electrically connected to a first power source, wherein the feedback terminal and the first reference terminal are configured to be equal in potential; the first reference terminal is configured to load a preset level V when receiving the level provided by the first power supply fb The method comprises the steps of carrying out a first treatment on the surface of the The DC voltage converter is used for loading a preset level V at the feedback end fb Generating an initial reference voltage V c And outputs an initial reference voltage V to the VCOM electrode through the first output terminal c 。
In the present embodiment, the initial voltage generation module 100 includes, but is not limited to, a DC-DC converter.
In the present embodiment, the first power supply provides a level V ref And by making the level provided by the first power supply constant, the level of the first reference terminal is correspondingly constant, and the preset level V of the feedback terminal fb And is correspondingly constant according to the characteristic of virtual short.
It should be further noted that, in the present embodiment, the sixth resistor R6 is connected in series between the feedback end and the electrical connection point between the output end of the compensation module 300 and the input end of the feed-in module 400, but according to the "virtual break" characteristic of the first reference end and the feedback end of the initial voltage generating module 100, it can be determined that the current flowing through the sixth resistor R6 is zero, so that the current flowing through the sixth resistor R6 is zero, the electrical connection point between the output end of the compensation module 300 and the input end of the feed-in module 400 and the feedback end are equipotential points, and according to the "virtual short" characteristic, the electrical connection point between the output end of the compensation module 300 and the input end of the feed-in module 400 and the first reference end are equipotential points.
In this embodiment, referring to fig. 2, when the debug circuit works to compensate the reference voltage, the pulse signal output by the control module 200 is filtered by the first resistor R1 and the first capacitor C1 to generate a dc level V pwm-0 If it is greater than the preset level V fb Large, a feed current I is supplied through the second resistor R2 and the third resistor R3 1-0 . Due to the preset level V at the feedback end of the initial voltage generation module 100 fb Is constant in voltage, I 3-0 ＝V fb R5 is constant. Then the feed current I 1-0 The magnitude directly influences the compensation current I 2 I.e. to influence the voltage drop VR5 over the fifth resistor R5, at the same time V 0 ＝V fb +VR5，V fb Invariably, the change in VR5 ultimately translates into a change in V 0 。
It should be noted that, in the embodiment of the present application, the control module 200 includes, but is not limited to, one of the following: singlechip, PFGA and DSP. The control module 200 integrates therein a pulse code modulation (PWM) module, and the control module 200 is also used for calibrating the related control of the common level voltage by the display module 500, for example: whether the display module 500 displays normally and whether the brightness is normal after receiving the corresponding reference voltage is detected.
It should be noted that, the debug circuit of the embodiment of the present application can provide specific common-stage voltages for different display modules 500, and can generate different compensation voltages without depending on a hardware circuit, which results in inconsistency of hardware BOM; meanwhile, different compensation voltages are generated through software adjustment, hardware circuit modification is not needed, and maintenance cost is greatly reduced.
The embodiment of the application provides a reference voltage debugging method, which comprises the steps of:
step 1, a control module obtains an initial reference voltage output to a VCOM electrode by an initial voltage generation module and a reference voltage required by the VCOM electrode, calculates a compensation voltage to be fed in according to the reference voltage and the initial reference voltage, and transmits a pulse signal to the compensation module after generating the pulse signal with a preset duty ratio according to the compensation voltage.
And 2, after receiving the pulse signal, the compensation module generates a corresponding second direct current level according to the level of the pulse signal and a preset duty ratio, generates a corresponding compensation current according to the second direct current level and the acquired preset level, and transmits the compensation current to the feed-in module.
Step 3, the feed-in module generates a corresponding compensation voltage according to the compensation current and feeds the compensation voltage into the VCOM electrode.
In some of these embodiments, the compensation module generates the compensation current using the steps of:
step 1, a compensation module obtains a preset level, and generates a second constant current according to the preset level and a preset pull-down resistor, wherein the feedback end is grounded through the pull-down resistor, and the second constant current flows from the feedback end to the pull-down resistor.
In the present embodiment, the pull-down resistance is equivalent to the fourth resistance R4 in fig. 2.
And 2, the compensation module acquires a second potential difference of a second direct current level corresponding to a preset level, and determines a second feedback current output to the feedback end according to the second potential difference and a preset current limiting resistor.
In this embodiment, the current limiting resistor is equivalent to the second resistor R2 and the third resistor R3 connected in series in fig. 2.
And 3, determining the compensation current by the compensation module according to the current difference corresponding to the second feed current and the second constant current.
In this embodiment, the compensation module determines the compensation current according to the second feed current, the second constant current, and based on kirchhoff's law.
The embodiment of the application provides a debugging device for display module reference voltage, which comprises a control board, wherein a debugging circuit is arranged on the control board and is the display module reference voltage debugging circuit of the embodiment.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (12)
1. The debugging circuit of the reference voltage of the display module is characterized by comprising an initial voltage generation module, a control module, a compensation module and a feed-in module, wherein the initial voltage generation module comprises a feedback end and a first output end, the feedback end is respectively and electrically connected with the output end of the compensation module and the input end of the feed-in module, the first output end is respectively and electrically connected with the output end of the feed-in module and a VCOM electrode of the display module, the input end of the compensation module is electrically connected with the control module,
the initial voltage generation module is used for generating an initial reference voltage when the feedback end is connected to a preset level, and outputting the initial reference voltage to the VCOM electrode through the first output end;
the control module is used for generating a pulse signal with a preset duty ratio and outputting the pulse signal to the compensation module, and the preset duty ratio is based on compensation or attenuation determination of the initial reference voltage;
the compensation module comprises a filtering unit and a compensation current generation unit, one end of the filtering unit is electrically connected with the control module, the other end of the filtering unit is electrically connected with the input end of the compensation current generation unit, the output end of the compensation current generation unit is electrically connected with the feedback end and is pulled down to the ground through a constant current unit, and the constant current unit is used for generating a first constant current flowing out of the feedback end according to the preset level loaded by the feedback end; the filtering unit is used for processing the received pulse signal into a first direct current level and transmitting the first direct current level to the compensation current generating unit; the compensation current generation unit is used for calculating a first potential difference between the first direct current level and the preset level, generating a corresponding first feed current according to the first potential difference, and outputting the compensation current determined by the first feed current and the first constant current to the feed module;
the feed-in module is used for generating continuous compensation voltage according to the received compensation current and feeding the compensation voltage to the first output end and the VCOM electrode.
2. The debugging circuit of the reference voltage of the display module according to claim 1, wherein the filtering unit comprises an RC filtering unit, the RC filtering unit comprises a first resistor and a first capacitor, one end of the first resistor is connected with the control module, the other end of the first resistor is respectively and electrically connected with the compensation current generating unit and the first capacitor, and the other end of the first capacitor is grounded.
3. The debug circuitry of claim 1, wherein the filter unit comprises a low pass filter.
4. The debug circuitry of a display module reference voltage according to claim 1, wherein the compensation current generating unit comprises a second resistor and a third resistor connected in series, the second resistor is electrically connected to the filter unit relatively far from an end electrically connected to the third resistor, and the third resistor is electrically connected to the feedback end and the constant current unit relatively far from an end electrically connected to the second resistor.
5. The debugging circuit of the reference voltage of the display module according to claim 1, wherein the constant current unit comprises a fourth resistor, one end of the fourth resistor is electrically connected with the feed-in module, the feedback end and the output end of the compensation current generating unit respectively, the other end of the fourth resistor is grounded, the fourth resistor is used for pulling down the feedback end, and the first constant current is determined according to the preset level and the fourth resistor.
6. The debug circuitry of claim 1, wherein the feed-in module comprises a current-to-voltage conversion circuit, an input of the current-to-voltage conversion circuit is electrically connected to the feedback terminal, an output of the current-to-voltage conversion circuit is electrically connected to the first output, and wherein the current-to-voltage conversion circuit is configured to receive the compensation current and generate the compensation voltage according to the compensation current.
7. The debug circuitry of claim 6, wherein the current to voltage conversion circuitry comprises a fifth resistor, wherein one end of the fifth resistor is electrically connected to the feedback terminal, the constant current unit, and the compensation current generation unit, respectively, and the other end of the fifth resistor is electrically connected to the first output terminal, and wherein the compensation voltage is determined according to the fifth resistor and the compensation current.
8. The debug circuitry of claim 6, wherein the current to voltage conversion circuitry comprises a transimpedance amplifier.
9. The debug circuitry of claim 1, wherein the initial voltage generation module comprises a dc voltage converter comprising a first reference terminal, the feedback terminal, and the first output terminal, the first reference terminal being electrically connected to a first power source, wherein,
the feedback terminal and the first reference terminal are configured to be equal in potential;
the first reference terminal, upon receiving a level provided by the first power supply, the feedback terminal being configured to load the preset level;
the direct current voltage converter is used for generating the initial reference voltage when the feedback end loads the preset level, and outputting the initial reference voltage to the VCOM electrode through the first output end.
10. A method for debugging a reference voltage, comprising the display module reference voltage debugging circuit according to any one of claims 1 to 9, wherein the debugging method comprises:
the control module obtains the initial reference voltage output by the initial voltage generation module to the VCOM electrode and the reference voltage required by the VCOM electrode, calculates the compensation voltage to be fed in according to the reference voltage and the initial reference voltage, and transmits the pulse signal to the compensation module after generating the pulse signal with a preset duty ratio according to the compensation voltage;
the compensation module generates a corresponding second direct current level according to the level of the pulse signal and a preset duty ratio after receiving the pulse signal, generates a corresponding compensation current according to the second direct current level and the acquired preset level, and transmits the compensation current to the feed-in module;
the feed-in module generates the corresponding compensation voltage according to the compensation current and feeds the compensation voltage into the VCOM electrode.
11. The method of claim 10, wherein generating the corresponding compensation current from the second dc voltage level and the obtained preset level comprises:
the compensation module obtains the preset level and generates a second constant current according to the preset level and a preset pull-down resistor, wherein the feedback end is grounded through the pull-down resistor, and the second constant current flows from the feedback end to the pull-down resistor;
the compensation module obtains a second potential difference of the second direct current level corresponding to the preset level, and determines a second feedback current output to the feedback end according to the second potential difference and a preset current limiting resistor;
the compensation module determines the compensation current according to the current difference corresponding to the second feed current and the second constant current.
12. A display module reference voltage debugging device, comprising a control board, wherein a debugging circuit is arranged on the control board, and the display module reference voltage debugging device is characterized in that the debugging circuit is the display module reference voltage debugging circuit according to any one of claims 1 to 9.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050023080A (en) * | 2003-08-29 | 2005-03-09 | 비오이 하이디스 테크놀로지 주식회사 | Common voltage modulation circuit for LCD |
| CN101436386A (en) * | 2007-11-15 | 2009-05-20 | 中华映管股份有限公司 | Drive device for backlight module unit |
| CN202694024U (en) * | 2012-06-25 | 2013-01-23 | 杭州电子科技大学 | Intelligent simulation instrument |
| CN103680455A (en) * | 2013-12-24 | 2014-03-26 | 京东方科技集团股份有限公司 | Regulating circuit and display device for public voltage of display panel |
| CN106023877A (en) * | 2016-08-15 | 2016-10-12 | 京东方科技集团股份有限公司 | Public voltage adjusting circuit and method and display panel and device |
| CN107464535A (en) * | 2017-07-31 | 2017-12-12 | 惠州市德赛西威汽车电子股份有限公司 | The VCOM voltage regulator circuits and its method of a kind of range-controllable |
| KR20180013152A (en) * | 2016-07-28 | 2018-02-07 | 엘지디스플레이 주식회사 | Display device |
| CN107742983A (en) * | 2017-11-29 | 2018-02-27 | 上海南麟电子股份有限公司 | Share constant current constant voltage control module, reduction voltage circuit and the compensation method of compensation |
| CN111083854A (en) * | 2020-01-10 | 2020-04-28 | 中科芯集成电路有限公司 | LED display screen compensation circuit and method thereof |
| CN112492722A (en) * | 2019-08-23 | 2021-03-12 | 圣邦微电子（北京）股份有限公司 | LED drive circuit and control circuit thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008160933A (en) * | 2006-12-21 | 2008-07-10 | Sharp Corp | Chopper regulator circuit |
| US8581828B2 (en) * | 2010-04-30 | 2013-11-12 | Atmel Corporation | Load-aware compensation in light-emitting-diode backlight illumination systems |
| US8354798B2 (en) * | 2011-01-13 | 2013-01-15 | Simplexgrinnell Lp | Compensation circuit for current peaking reduction in notification appliances |
| KR20130012670A (en) * | 2011-07-26 | 2013-02-05 | 삼성디스플레이 주식회사 | Backlight unit and current controlling method thereof |
| CN102842280B (en) * | 2012-08-31 | 2016-03-30 | 京东方科技集团股份有限公司 | A kind of common electric voltage compensating circuit, method and liquid crystal indicator |
| US9590502B2 (en) * | 2012-12-04 | 2017-03-07 | Qorvo Us, Inc. | Regulated switching converter |
-
2021
- 2021-07-07 CN CN202110768132.9A patent/CN113674661B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050023080A (en) * | 2003-08-29 | 2005-03-09 | 비오이 하이디스 테크놀로지 주식회사 | Common voltage modulation circuit for LCD |
| CN101436386A (en) * | 2007-11-15 | 2009-05-20 | 中华映管股份有限公司 | Drive device for backlight module unit |
| CN202694024U (en) * | 2012-06-25 | 2013-01-23 | 杭州电子科技大学 | Intelligent simulation instrument |
| CN103680455A (en) * | 2013-12-24 | 2014-03-26 | 京东方科技集团股份有限公司 | Regulating circuit and display device for public voltage of display panel |
| KR20180013152A (en) * | 2016-07-28 | 2018-02-07 | 엘지디스플레이 주식회사 | Display device |
| CN106023877A (en) * | 2016-08-15 | 2016-10-12 | 京东方科技集团股份有限公司 | Public voltage adjusting circuit and method and display panel and device |
| CN107464535A (en) * | 2017-07-31 | 2017-12-12 | 惠州市德赛西威汽车电子股份有限公司 | The VCOM voltage regulator circuits and its method of a kind of range-controllable |
| CN107742983A (en) * | 2017-11-29 | 2018-02-27 | 上海南麟电子股份有限公司 | Share constant current constant voltage control module, reduction voltage circuit and the compensation method of compensation |
| CN112492722A (en) * | 2019-08-23 | 2021-03-12 | 圣邦微电子（北京）股份有限公司 | LED drive circuit and control circuit thereof |
| CN111083854A (en) * | 2020-01-10 | 2020-04-28 | 中科芯集成电路有限公司 | LED display screen compensation circuit and method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 一种PWM/PFM的同步整流升压转换器设计;韩基东;雍广虎;;电子与封装(09);全文 * |
| 一种可配置输出电流的LED电源设计;蔡如海;钟礼健;;中国照明电器(03);全文 * |
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