CN113112966A - Driving device and method of display panel, display device and display equipment - Google Patents

Driving device and method of display panel, display device and display equipment Download PDF

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Publication number
CN113112966A
CN113112966A CN202110394486.1A CN202110394486A CN113112966A CN 113112966 A CN113112966 A CN 113112966A CN 202110394486 A CN202110394486 A CN 202110394486A CN 113112966 A CN113112966 A CN 113112966A
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brightness
display panel
signal
level signal
digital signal
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CN202110394486.1A
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CN113112966B (en
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翁彬
翁祖伟
苏毅烽
刘葆
黄巧红
黄宇鹏
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BOE Technology Group Co Ltd
Fuzhou BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Fuzhou BOE Optoelectronics Technology Co Ltd
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the application provides a driving device of a display panel, a method, a display device and a display device, the driving device is arranged to comprise an analog-to-digital conversion module and a brightness adjusting module, the analog-to-digital conversion module is used for converting a PWM waveform into a digital signal to adapt to the voltage specification of the brightness adjusting module, the brightness adjusting module can identify whether the digital signal is a high-level signal or a low-level signal after receiving the digital signal sent by the analog-to-digital conversion module, if the digital signal is the high-level signal, the brightness of the display panel is increased, and if the digital signal is the low-level signal, the brightness of the display panel is reduced, so that the brightness difference of the display panel when the digital signal is the high-level signal and the low-level signal is reduced, and the problem that the driving device causes the phenomenon of the Water.

Description

Driving device and method of display panel, display device and display equipment
Technical Field
The present disclosure relates to the field of semiconductor technologies, and in particular, to a driving apparatus and method for a display panel, a display apparatus, and a display device.
Background
An important component of an electronic device implementing a display function is a display, and a liquid crystal display is a common display. The liquid crystal display comprises a display panel and a backlight module, and the driving circuit drives and adjusts the brightness of the backlight module. Currently, the backlight brightness is adjusted by a PWM (Pulse Width Modulation) method, that is, the brightness of the backlight module is adjusted by changing the duty ratio of the PWM signal under a certain frequency condition. When the duty ratio of the high level time of the PWM is larger, the integral brightness of the display is higher; conversely, the larger the duty ratio of the low level time of the PWM is, the lower the overall brightness of the display is.
However, the illumination may affect the conductive characteristics of the active layer of the display panel in the display, and affect the charging, so that the driving circuit may cause the display panel to generate a Water Fall (waterfall) phenomenon.
Disclosure of Invention
An object of the embodiments of the present application is to provide a driving apparatus and method for a display panel, a display apparatus, and a display device, so as to solve the technical problem that the driving apparatus causes a Water Fall phenomenon on the display panel.
The specific technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a driving apparatus for a display panel, including: the analog-digital conversion module and the brightness adjusting module;
the analog-to-digital conversion module is used for converting the PWM waveform into a digital signal and transmitting the digital signal to the brightness adjustment module;
and the brightness adjusting module is used for increasing the brightness of the display panel when the digital signal is a high-level signal or reducing the brightness of the display panel when the digital signal is a low-level signal.
In an implementation method of the embodiment of the present application, the brightness adjusting module includes: the first brightness adjusting submodule and/or the second brightness adjusting submodule;
the first brightness adjusting submodule is used for reducing the brightness difference of the display panel when the digital signal is a high level signal and a low level signal by adjusting the driving capability of the voltage source and compensating the data signal;
and the second brightness adjusting submodule is used for reducing the brightness difference of the display panel when the digital signal is a high-level signal and a low-level signal by adjusting the closing voltage of the array substrate in the display panel.
In an implementation method of the embodiment of the present application, the first brightness adjustment sub-module includes: a timing control circuit;
and the time sequence control circuit is used for reducing the driving capability of the voltage source when the digital signal is a low-level signal, and compensating the data signal according to a preset compensation strategy so as to reduce the brightness of the display panel.
In an implementation method of the embodiment of the application, the timing control circuit is further configured to keep the driving capability of the voltage source unchanged when the digital signal is a high-level signal, so as to keep the luminance of the display panel unchanged.
In an implementation method of the embodiment of the present application, the second brightness adjustment sub-module includes: the device comprises a NOT gate unit, a triode and an in-phase addition unit;
the NOT gate unit is used for carrying out phase inversion processing on the digital signal and transmitting the signal after the phase inversion processing to a grid electrode of the triode;
the triode is used for being opened when the output signal of the NOT gate unit is a low-level signal and transmitting the reference voltage input by the source electrode to the in-phase addition unit, wherein the reference voltage is negative voltage;
and the in-phase addition unit is used for adding the turn-off voltage of the array substrate and the reference voltage so as to reduce the turn-off voltage of the array substrate.
In an implementation method of the embodiment of the application, the triode is further configured to be turned off when an output signal of the not gate unit is a high-level signal, so that a turn-off voltage of the array substrate is kept unchanged.
In a second aspect, an embodiment of the present application provides a display device, which includes a display panel, a backlight module located on a back surface of the display panel, and the driving device provided in the first aspect of the embodiment of the present application.
In a third aspect, an embodiment of the present application provides a display apparatus including the display device provided in the second aspect of the embodiment of the present application.
In a fourth aspect, an embodiment of the present application provides a driving method of a display panel, including:
the analog-digital conversion module converts the PWM waveform into a digital signal and transmits the digital signal to the brightness adjustment module;
the brightness adjusting module identifies the digital signal as a high level signal or a low level signal;
the brightness adjusting module increases the brightness of the display panel when recognizing that the digital signal is a high level signal;
and when the brightness adjusting module identifies that the digital signal is a low-level signal, the brightness of the display panel is reduced.
In an implementation method of the embodiment of the present application, the brightness adjusting module includes: the first brightness adjusting submodule and/or the second brightness adjusting submodule; the first brightness adjustment submodule includes: a timing control circuit; the second brightness adjustment submodule includes: the device comprises a NOT gate unit, a triode and an in-phase addition unit;
the step of increasing the brightness of the display panel when the brightness adjusting module identifies that the digital signal is a high level signal comprises the following steps:
the NOT gate unit carries out phase inversion processing on the digital signal and transmits the signal after the phase inversion processing to a grid electrode of the triode;
the triode is opened when the output signal of the NOT gate unit is a low-level signal, and transmits the reference voltage input by the source electrode to the in-phase addition unit, wherein the reference voltage is negative voltage;
the in-phase addition unit adds the turn-off voltage of the array substrate and the reference voltage to reduce the turn-off voltage of the array substrate;
the step of reducing the brightness of the display panel when the brightness adjusting module identifies that the digital signal is a low level signal comprises the following steps:
the sequential control circuit reduces the driving capability of the voltage source when the digital signal is a low level signal, and compensates the data signal according to a preset compensation strategy so as to reduce the brightness of the display panel.
In the driving device, the method, the display device and the display equipment of the display panel, the driving device is set to comprise the analog-to-digital conversion module and the brightness adjusting module, the analog-to-digital conversion module is used for converting the PWM waveform into the digital signal so as to adapt to the voltage specification of the brightness adjusting module, the brightness adjusting module can identify whether the digital signal is a high-level signal or a low-level signal after receiving the digital signal sent by the analog-to-digital conversion module, if the digital signal is the high-level signal, the brightness of the display panel is increased, and if the digital signal is the low-level signal, the brightness of the display panel is reduced, so that the brightness difference of the display panel when the digital signal is the high-level signal and the low-level signal is reduced, and the problem that the driving device causes the phenomenon of the Water Fall.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is also obvious for a person skilled in the art to obtain other embodiments according to the drawings.
FIG. 1 is a diagram illustrating a Water Fall phenomenon in the prior art;
fig. 2 is a schematic structural diagram of a driving apparatus of a display panel according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a driving apparatus of a display panel according to another embodiment of the present application;
FIG. 4 is a schematic structural diagram of a driving apparatus of a display panel according to yet another embodiment of the present application;
FIG. 5 is a schematic structural diagram of a driving apparatus of a display panel according to yet another embodiment of the present application;
FIG. 6 is a circuit diagram of a driving apparatus of a display panel according to an embodiment of the present disclosure;
fig. 7 is a flowchart illustrating a driving method of a display panel according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the description herein are intended to be within the scope of the present disclosure.
Because the conductor characteristics of the active layer in the display panel can be changed by illumination, the charging delay is longer when the display panel is charged under the illumination condition compared with the charging delay without illumination, so that the display panel enters a charging state in a delayed manner, the actual charging time is short, the charging rate is insufficient, and the brightness of the display panel is low. The brightness of the backlight module of the target control display panel is controlled through the PWM wave, so that the display panel is sometimes illuminated and sometimes not illuminated, and the transverse Block is caused by the brightness difference of the display panel, namely the Water Fall phenomenon is caused.
For example, assuming that the PWM period is T, the high level duration of the PWM is H (at this time, the backlight is in a bright state), and the low level duration of the PWM is L (at this time, the backlight is in a dark state), so that the backlight brightness is changed by adjusting the duty ratio of the high level to the low level, and the larger the high level duration H of the PWM is, the higher the overall brightness of the display is; conversely, the larger the low-level duration L of the PWM is, the lower the overall brightness of the display is.
The display panel comprises an array substrate and a color film substrate which are arranged in a pair, wherein the array substrate comprises a substrate, an active layer and a signal data layer which are sequentially overlapped, and protective layers positioned on the active layer and the signal data layer; the color film substrate comprises a substrate and a color filter film. Since the active layer under the signal data layer is a photoelectric conductive material layer, when the backlight is in a bright state, light irradiation has an influence on the conductor characteristics of the active layer. For example, the conductivity of the active layer under light increases sharply, so that the active layer has a conductive characteristic, which results in a more severe charging delay when charged than when not illuminated.
Under the same data signal voltage, the charging delay is larger when the display panel is illuminated, so that the display panel enters a charging state in a delayed manner, the actual charging time is shorter, the charging rate is insufficient, the actual pixel voltage is lower, and the brightness of the display panel is lower. Moreover, since the array substrate is refreshed row by row from top to bottom, when there is illumination, the display panel may be laterally broken due to brightness difference, that is, brightness of a plurality of regions on the display panel is not uniform, for example, as shown in fig. 1, the plurality of regions includes a region 1, a region 2, and a region 3, the region 1 and the region 3 are brighter, and the region 2 is darker, that is, a Water Fall phenomenon is caused.
In view of this, the present disclosure provides a driving apparatus for a display panel, which can correspondingly increase the brightness of the display panel when the PWM wave is at a high level or decrease the brightness of the display panel when the PWM wave is at a low level according to the high and low levels of the PWM wave, so as to achieve the purpose of decreasing the brightness difference of the display panel when the digital signal is a high level signal and a low level signal, and further solve the technical problem that the driving apparatus causes the Water Fall phenomenon of the display panel.
The following describes a driving apparatus and method of a display panel, a display apparatus, and a display device provided in embodiments of the present application in detail with reference to the accompanying drawings.
The embodiment of the present application provides a driving apparatus for a display panel, as shown in fig. 2, the driving apparatus includes an analog-to-digital conversion module 10 and a brightness adjustment module 20; wherein:
the analog-to-digital conversion module 10 is configured to convert the PWM waveform into a digital signal, and transmit the digital signal to the brightness adjustment module 20; the brightness adjusting module 20 is configured to increase the brightness of the display panel when the digital signal is a high level signal, or decrease the brightness of the display panel when the digital signal is a low level signal.
In the driving device provided by the embodiment of the application, the analog-to-digital conversion module converts the PWM waveform into the digital signal, so as to adapt to the voltage specification of the brightness adjustment module, the brightness adjustment module can identify whether the digital signal is a high level signal or a low level signal after receiving the digital signal sent by the analog-to-digital conversion module, if the digital signal is the high level signal, the brightness of the display panel is increased, if the digital signal is the low level signal, the brightness of the display panel is reduced, so that the brightness difference of the display panel when the digital signal is the high level signal and the low level signal is reduced, and the problem that the drive device causes the phenomenon of Water Fall of the display panel is solved.
In one implementation manner of the embodiment of the present application, as shown in fig. 3, the brightness adjusting module 20 includes a first brightness adjusting sub-module 21, where the first brightness adjusting sub-module 21 is configured to reduce a brightness difference of the display panel when the digital signal is a high-level signal and a low-level signal by adjusting a driving capability of the voltage source and compensating the data signal.
The first brightness adjusting submodule has the functions of adjusting the driving capability of the voltage source S-IC and compensating the Data signal Data, and the brightness of the display panel can be increased or reduced to a certain extent by adjusting the driving capability of the S-IC and compensating the Data.
Wherein the first brightness adjusting sub-module may include: time sequence control circuit Tcon IC，TconThe IC is used for reducing the driving capability of the voltage source S-IC when the digital signal is a low-level signal, and compensating the Data signal Data according to a preset compensation strategy, thereby reducing the brightness of the display panel.
The driving capability of the S-IC is generally four steps (100%, 75%, 50%, 25%), and under normal conditions, the driving capability of the S-IC is set to 100% or 75%, and when the digital signal is a low-level signal, the leakage current I is setoffThe charging rate is decreased. To maintain the charging effect of the pixels, the driving capability of the S-IC may be reduced, for example to25% or 50%, TconA group of Command in data information of IC and S-IC communication is used to set parameters of S-IC operation, two bits of which are used to control driving capability (00/01/10/11) of S-IC, corresponding to four gears, TconThe IC controls the driving capability by changing the Command, for example, if the two bits of the Command are 10 corresponding to the driving capability of 50% and 11 corresponding to the driving capability of 25%, the two bits of the Command can be changed to 10 or 11, so as to achieve the purpose of reducing the driving capability of the S-IC; on the other hand, Data can be compensated, during specific compensation, the Data can be compensated by using a preset compensation strategy according to the actual value of the Data, the brightness of the display panel is weakened to a certain extent, the normal brightness of the display panel can be generally divided into 256 gray scales, the brightness of the originally same gray scale signal is inconsistent due to charging reasons due to the displayed brightness difference caused by backlight brightness switching, and the Data compensation basis is as follows: assuming that the gray scale difference between the bright and dark is 3 gray scales, T is set when the backlight is dark (the digital signal is a low level signal)conThe Data output by the IC compensates the 3 gray levels downwards, so that when the panel displays, the originally brighter area is displayed darker due to the compensation reason. For example, the original TconThe signal output by the IC is L127(127 gray scale), the display effect is changed from L127 to L130 due to backlight darkness, Data is compensated when the backlight is L127 when the backlight is bright (the digital signal is a high-level signal), and the display effect is L127 when the backlight is dark and is kept unchanged when the backlight is bright.
When the digital signal is a high level signal, TconThe IC can also keep the original driving capability of the S-IC unchanged without compensating Data, so that the normal display state of the display panel is kept. Of course, in the implementation, when the digital signal is a high level signal, if the current driving capability of the S-IC is not 100%, the driving capability of the S-IC may be increased, so that the brightness of the display panel is increased.
In practical implementation, the normal brightness of the display panel is generally divided into 256 gray levels, and the brightness difference of the display caused by the backlight brightness switching makes the original same brightnessIf the brightness of the gray scale signal is inconsistent due to charging, the digital signal can also be a high level signal for TconThe Data output by the IC is compensated upwards so that the originally darker area appears brighter for compensation reasons. For example, the original TconData output by the IC is L127(127 gray scale), the display effect is changed from L127 to L130 due to backlight darkness, and the display effect is L130 when the backlight is bright or L127 when the backlight is dark, the Data is compensated, the output signal is L130 when the backlight is bright, and the L127 is kept unchanged when the backlight is dark, so that the display effect is L130.
In summary, pass TconThe IC adjusts the driving capability of the voltage source and compensates the data signal, so that the brightness of the display panel when the digital signal is a low level signal can be reduced, the brightness of the display panel when the digital signal is a high level signal can be kept unchanged, or the brightness of the display panel when the digital signal is a high level signal can be increased, so that the brightness difference of the display panel when the digital signal is a high level signal and a low level signal can be reduced.
In another implementation manner of the embodiment of the present application, as shown in fig. 4, the brightness adjusting module 20 includes a second brightness adjusting sub-module 22, where the second brightness adjusting sub-module 22 is configured to adjust a turn-off voltage of an array substrate in the display panel to reduce a brightness difference of the display panel when the digital signal is a high level signal and a low level signal.
The second brightness adjusting submodule has a function of adjusting the turn-off voltage of the array substrate in the display panel, and the brightness of the display panel can be increased or reduced by adjusting the turn-off voltage of the array substrate.
Wherein the second brightness adjusting sub-module may include: the non-gate unit is used for carrying out anti-phase processing on the digital signal and transmitting the signal after the anti-phase processing to a grid electrode of the triode; the triode is used for being opened when the output signal of the NOT gate unit is a low-level signal and transmitting the reference voltage input by the source electrode to the in-phase addition unit, wherein the reference voltage is negative voltage; and the in-phase addition unit is used for adding the turn-off voltage of the array substrate and the reference voltage so as to reduce the turn-off voltage of the array substrate.
The not gate unit has the following characteristics: the input digital signal is subjected to an inversion process as shown in table 1.
TABLE 1 NOT-gate unit working truth table
Input device Output of
0 1
1 0
The digital signal of PWM waveform controls the triode switch after passing through the NOT gate unit, when the input digital signal is a high level signal, the signal after the inversion processing is a low level signal after passing through the NOT gate unit, at the moment, the triode is opened, and the reference voltage V input by the source electrode of the trioderefTransmitting to the in-phase addition unit, and adding the turn-off voltages VGL and V of the array substrate via the in-phase addition unitrefAddition of where VrefCan be based on VGL and IoffIs determined by the characteristic curve of (V)refThe negative voltage is obtained, the turn-off voltage of the array substrate is reduced after the in-phase addition unit, and the corresponding IoffAnd the pixel charging rate is reduced, so that the brightness of the display panel is increased.
In general, the turn-off voltage of the array substrate is two VGL and LVGL paths, and two reference voltages V may be set correspondinglyref1And Vref2Correspondingly, the voltage VGL (out) is VGL + V through the in-phase addition unitref1；LVGL(OUT)＝LVGL+Vref2。
When the digital signal is a low level signal, the inverted signal is a high level signal after passing through the NOT gate unit, the triode is closed, and the reference voltage V input by the source electrode of the trioderefAnd the output voltage of the in-phase addition unit is the turn-off voltage VGL and LVGL of the array substrate, namely the turn-off voltage of the array substrate is kept unchanged. Thereby keeping the normal display state of the display panel unchanged.
In summary, through the adjustment of the second brightness adjustment sub-module, the brightness of the display panel when the digital signal is a high level signal can be increased, and meanwhile, the brightness of the display panel when the digital signal is a low level signal is kept unchanged, so that the brightness difference of the display panel when the digital signal is a high level signal and a low level signal is reduced.
In yet another implementation manner of the embodiment of the present application, as shown in fig. 5, the brightness adjusting module 20 includes a first brightness adjusting sub-module 21 and a second brightness adjusting sub-module 22, where the first brightness adjusting sub-module 21 includes: time sequence control circuit TconIC; the second brightness adjustment sub-module 22 may include: the device comprises a NOT gate unit, a triode and an in-phase addition unit. The specific circuit structure is shown in fig. 6, where the ADC is an analog-to-digital conversion module, the upper half circuit connected to the output end of the ADC is a first brightness adjustment sub-module, and the lower half circuit connected to the output end of the ADC is a second brightness adjustment sub-module.
TconThe IC is used for reducing the driving capability of the voltage source S-IC when the digital signal is a low-level signal, and compensating the Data signal Data according to a preset compensation strategy, thereby reducing the brightness of the display panel.
The NOT gate unit is used for carrying out phase inversion processing on the digital signal and transmitting the signal after the phase inversion processing to a grid electrode of the triode; the triode is used for being opened when an output signal of the NOT gate unit is a low-level signal (namely, a digital signal is a high-level signal), and transmitting a reference voltage input by the source electrode to the in-phase addition unit, wherein the reference voltage is a negative voltage; and the in-phase addition unit is used for adding the turn-off voltage of the array substrate and the reference voltage so as to reduce the turn-off voltage of the array substrate.
Assuming that the input currents of the operational amplifiers U1 and U2 are zero (broken), no current flows through the non-inverting terminals of U1 and U2, and the currents flowing through R3 and R4 are the same, and the currents flowing through R1 and R2 are the same, so that (VGL-V1-)/R3 is (V-V)ref1The calculation formula of the in-phase addition unit may be expressed as VGL (out) ═ VGL + V1 +/R2, provided that R1 ═ R2 ═ R3 ═ R4, V1-)/R4, V1+/R1 ═ VGL (out) ═ VGL + V1+)/R2ref1Similarly, LVGL (OUT) ═ LVGL + Vref2。
In summary, pass TconThe driving capability of the IC adjusting voltage source compensates the data signal, the brightness of the display panel when the digital signal is a low level signal can be reduced, and the brightness of the display panel when the digital signal is a high level signal can be increased through the adjustment of the second brightness adjusting submodule, so that the brightness difference of the display panel when the digital signal is a high level signal and a low level signal is reduced.
The embodiment of the application also provides a display device, which comprises a display panel, a backlight module positioned on the back of the display panel and the driving device.
In some embodiments, the display panel includes an array substrate and a color filter substrate that are disposed opposite to each other, the array substrate has an active layer, and no light shielding component is disposed between the active layer and a substrate of the array substrate.
The embodiment of the application also provides display equipment comprising the display device.
The embodiment of the present application further provides a driving method of a display panel, as shown in fig. 7, the method may include the following steps:
and S701, the analog-to-digital conversion module converts the PWM waveform into a digital signal and transmits the digital signal to the brightness adjustment module.
S702, the brightness adjusting module identifies the digital signal as a high level signal or a low level signal. If the signal is a high level signal, S703 is performed, and if the signal is a low level signal, S704 is performed
S703, the brightness adjusting module increases the brightness of the display panel.
S704, the brightness adjusting module reduces the brightness of the display panel.
In an implementation manner of the embodiment of the present application, the brightness adjusting module includes: the first brightness adjusting submodule and/or the second brightness adjusting submodule; the first brightness adjustment submodule includes: a timing control circuit; the second brightness adjustment submodule includes: the device comprises a NOT gate unit, a triode and an in-phase addition unit;
s703 may specifically be: the NOT gate unit carries out phase inversion processing on the digital signal and transmits the signal after the phase inversion processing to a grid electrode of the triode; the triode is opened when the output signal of the NOT gate unit is a low-level signal, and transmits the reference voltage input by the source electrode to the in-phase addition unit, wherein the reference voltage is negative voltage; the in-phase addition unit adds the turn-off voltage of the array substrate and the reference voltage to reduce the turn-off voltage of the array substrate;
s704 may specifically be: when the digital signal is a low level signal, the sequential control circuit reduces the driving capability of the voltage source, and compensates the data signal according to a preset compensation strategy so as to reduce the brightness of the display panel.
The scheme of the embodiment of the application, set up drive arrangement to include analog-to-digital conversion module and luminance control module, analog-to-digital conversion module is used for converting the PWM waveform into digital signal, in order to adapt to the voltage specification of luminance control module, luminance control module is after receiving the digital signal that analog-to-digital conversion module sent, can discern whether digital signal is high level signal or low level signal, if be high level signal then increase display panel's luminance, if be low level signal then reduce display panel's luminance, thereby reduced display panel's luminance difference when digital signal is high level signal and low level signal, and then solved drive arrangement and caused the problem that the display panel appears the Water Fall phenomenon.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present application and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims (10)

1. A driving apparatus of a display panel, comprising: the analog-digital conversion module and the brightness adjusting module;
the analog-to-digital conversion module is used for converting the Pulse Width Modulation (PWM) waveform into a digital signal and transmitting the digital signal to the brightness adjustment module;
the brightness adjusting module is used for increasing the brightness of the display panel when the digital signal is a high level signal, or reducing the brightness of the display panel when the digital signal is a low level signal.
2. The driving apparatus according to claim 1, wherein the brightness adjustment module comprises: the first brightness adjusting submodule and/or the second brightness adjusting submodule;
the first brightness adjusting submodule is used for reducing the brightness difference of the display panel when the digital signal is a high level signal and a low level signal by adjusting the driving capability of a voltage source and compensating a data signal;
the second brightness adjusting submodule is used for reducing the brightness difference of the display panel when the digital signal is a high level signal and a low level signal by adjusting the closing voltage of the array substrate in the display panel.
3. The driving apparatus as claimed in claim 2, wherein the first brightness adjusting sub-module comprises: a timing control circuit;
and the time sequence control circuit is used for reducing the driving capability of the voltage source when the digital signal is a low-level signal, and compensating the data signal according to a preset compensation strategy so as to reduce the brightness of the display panel.
4. The driving apparatus as claimed in claim 3, wherein the timing control circuit is further configured to keep the driving capability of the voltage source unchanged when the digital signal is a high-level signal, so as to keep the brightness of the display panel unchanged.
5. The driving apparatus as claimed in claim 2, wherein the second brightness adjusting sub-module comprises: the device comprises a NOT gate unit, a triode and an in-phase addition unit;
the NOT gate unit is used for carrying out phase inversion processing on the digital signal and transmitting the signal after the phase inversion processing to a grid electrode of the triode;
the triode is used for being opened when an output signal of the NOT gate unit is a low-level signal, and transmitting a reference voltage input by a source electrode to the in-phase addition unit, wherein the reference voltage is a negative voltage;
the in-phase addition unit is used for adding the turn-off voltage of the array substrate and the reference voltage so as to reduce the turn-off voltage of the array substrate.
6. The driving apparatus as claimed in claim 5, wherein the transistor is further configured to turn off when the output signal of the not gate unit is a high level signal, so that the turn-off voltage of the array substrate remains unchanged.
7. A display device comprising a display panel, a backlight module disposed behind the display panel, and the driving device as claimed in any one of claims 1 to 6.
8. A display apparatus characterized by comprising the display device according to claim 7.
9. A method of driving a display panel, comprising:
the analog-to-digital conversion module converts the PWM waveform into a digital signal and transmits the digital signal to the brightness adjustment module;
the brightness adjusting module identifies the digital signal as a high level signal or a low level signal;
when the digital signal is identified to be a high-level signal by the brightness adjusting module, the brightness of the display panel is increased;
and the brightness adjusting module reduces the brightness of the display panel when recognizing that the digital signal is a low level signal.
10. The driving method according to claim 9, wherein the brightness adjustment module includes: the first brightness adjusting submodule and/or the second brightness adjusting submodule; the first brightness adjustment sub-module includes: a timing control circuit; the second brightness adjustment sub-module includes: the device comprises a NOT gate unit, a triode and an in-phase addition unit;
when the brightness adjusting module identifies that the digital signal is a high-level signal, the step of increasing the brightness of the display panel comprises the following steps:
the NOT gate unit carries out phase inversion processing on the digital signal and transmits the signal after the phase inversion processing to a grid electrode of the triode;
the triode is opened when the output signal of the NOT gate unit is a low-level signal, and transmits a reference voltage input by a source electrode to the in-phase addition unit, wherein the reference voltage is a negative voltage;
the in-phase addition unit adds the turn-off voltage of the array substrate and the reference voltage to reduce the turn-off voltage of the array substrate;
when the brightness adjusting module identifies that the digital signal is a low level signal, the step of reducing the brightness of the display panel includes:
and when the digital signal is a low-level signal, the sequential control circuit reduces the driving capability of the voltage source and compensates the data signal according to a preset compensation strategy so as to reduce the brightness of the display panel.
CN202110394486.1A 2021-04-13 2021-04-13 Driving device and method of display panel, display device and display equipment Active CN113112966B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1645212A (en) * 2005-01-28 2005-07-27 广辉电子股份有限公司 Controlling module and method for backlight module, liquid crystal device therewith
JP2006195306A (en) * 2005-01-17 2006-07-27 Sony Corp Method and equipment for driving light-emitting device, and display device
CN101241248A (en) * 2007-02-09 2008-08-13 群康科技(深圳)有限公司 Liquid crystal display device and driving method thereof
CN103903571A (en) * 2012-12-27 2014-07-02 乐金显示有限公司 Backlight driver of liquid crystal display device and method of driving the same
CN106548760A (en) * 2017-01-16 2017-03-29 京东方科技集团股份有限公司 A kind of gamma voltage generation circuit and control method, source electrode driver
CN109559674A (en) * 2019-01-29 2019-04-02 合肥京东方显示技术有限公司 Shift register cell and its driving method, gate driving circuit and display device
CN110634453A (en) * 2019-09-30 2019-12-31 京东方科技集团股份有限公司 Pixel charging method, pixel charging circuit, display device and display control method
US20200365092A1 (en) * 2019-05-15 2020-11-19 Sharp Kabushiki Kaisha Display device and method for driving the same
CN112017600A (en) * 2019-05-30 2020-12-01 京东方科技集团股份有限公司 Driving device and method of liquid crystal display panel and display device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006195306A (en) * 2005-01-17 2006-07-27 Sony Corp Method and equipment for driving light-emitting device, and display device
CN1645212A (en) * 2005-01-28 2005-07-27 广辉电子股份有限公司 Controlling module and method for backlight module, liquid crystal device therewith
CN101241248A (en) * 2007-02-09 2008-08-13 群康科技(深圳)有限公司 Liquid crystal display device and driving method thereof
CN103903571A (en) * 2012-12-27 2014-07-02 乐金显示有限公司 Backlight driver of liquid crystal display device and method of driving the same
CN106548760A (en) * 2017-01-16 2017-03-29 京东方科技集团股份有限公司 A kind of gamma voltage generation circuit and control method, source electrode driver
CN109559674A (en) * 2019-01-29 2019-04-02 合肥京东方显示技术有限公司 Shift register cell and its driving method, gate driving circuit and display device
US20200365092A1 (en) * 2019-05-15 2020-11-19 Sharp Kabushiki Kaisha Display device and method for driving the same
CN112017600A (en) * 2019-05-30 2020-12-01 京东方科技集团股份有限公司 Driving device and method of liquid crystal display panel and display device
CN110634453A (en) * 2019-09-30 2019-12-31 京东方科技集团股份有限公司 Pixel charging method, pixel charging circuit, display device and display control method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
管雪梅: "比例运算电路", 《检测与转换技术》 *

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