CN113129850A - Device and method for improving boot-strap afterimage and display device - Google Patents
Device and method for improving boot-strap afterimage and display device Download PDFInfo
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- CN113129850A CN113129850A CN202110409000.7A CN202110409000A CN113129850A CN 113129850 A CN113129850 A CN 113129850A CN 202110409000 A CN202110409000 A CN 202110409000A CN 113129850 A CN113129850 A CN 113129850A
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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
- G09G3/36—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 using liquid crystals
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- Liquid Crystal Display Device Control (AREA)
Abstract
Disclosed herein is an apparatus for improving boot-strap afterimage, including: the power supply management module is configured to output a common voltage signal at a common voltage output end and output a first analog power supply signal at a first analog power supply output end; the detection and control module is configured to send a first control signal to the switch module, the gate driving module and the source driving module if a shutdown signal is detected; the switch module is configured to be communicated with the connection between the common voltage output end and the first analog power supply output end under the control of a first control signal; the gate driving module is configured to provide gate driving voltage signals capable of turning on the transistors for all driving transistors of the panel pixel driving circuit under the control of the first control signal; and the source electrode driving module is configured to set the voltage values on all the data lines of the panel pixel driving circuit to be the voltage value of the first analog power supply signal under the control of the first control signal. The scheme can solve the problem of afterimage of flashing white lines or white areas after startup.
Description
Technical Field
The present disclosure relates to, but not limited to, the field of display technologies, and in particular, to an apparatus and a method for improving boot-strap afterimage, and a display apparatus.
Background
As display product technologies continue to develop, monitor and television products are developing towards high resolution and large size.
The large-size product has large load and large capacitance, when the liquid crystal display is powered off, because the voltage of the pixel electrode in the panel is not consistent with the voltage of the common electrode, the charge residue exists between the two polar plates of the pixel unit, and when the liquid crystal display is powered on again, the problem that a picture has a white line or one area is whitish exists.
Disclosure of Invention
In a first aspect, an embodiment of the present disclosure provides an apparatus for improving boot image retention, including: the device comprises a power management module, a detection and control module, a switch module, a grid driving module and a source driving module;
the power supply management module is configured to output a common voltage signal at a common voltage output end and output a first analog power supply signal at a first analog power supply output end; the common voltage signal is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal is provided for a source electrode driving module;
the detection and control module is configured to send a first control signal to the switch module, the gate driving module and the source driving module if a shutdown signal is detected;
a switch module configured to communicate a connection between the common voltage output terminal and the first analog power supply output terminal under control of a first control signal;
the gate driving module is configured to provide gate driving voltage signals capable of turning on the driving transistors for all the driving transistors of the panel pixel driving circuit under the control of a first control signal;
and the source electrode driving module is configured to set the voltage values on all the data lines of the panel pixel driving circuit to be the voltage value of the first analog power supply signal under the control of the first control signal.
In a second aspect, an embodiment of the present disclosure provides a method for improving boot image retention, including:
detecting a shutdown signal;
if the shutdown signal is detected, the connection between the common voltage output end of the power management module and the first analog power output end is communicated, the voltage values of all data lines of the panel pixel driving circuit are set to be the voltage value of the first analog power signal output by the first analog power output end, and all driving transistors of the panel pixel driving circuit are controlled to be conducted;
the common voltage signal output by the common voltage output end is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal output by the first analog power supply output end is provided for the source electrode driving module.
In a third aspect, an embodiment of the present disclosure provides a display device, including the above device for improving boot image retention.
The device, the method and the display device for improving the boot-strap afterimage provided by the embodiment of the disclosure are characterized in that a switch module is arranged between the common voltage output end of the power management module and the first analog power output end, when the detection and control module detects a shutdown signal, the control switch module is communicated with the connection between the common voltage output end and the first analog power supply output end, and controls the gate driving module to turn on all driving transistors of the panel pixel driving circuit and controls the source driving module to set voltages on all data lines of the panel pixel driving circuit to voltage values of the first analog power supply signal, the voltage values of all the pixel electrodes on the panel are equal to the voltage values of the common electrode through the processing, the pixel electrodes and the common electrode discharge synchronously, the voltage difference between the pixel electrodes and the common electrode is eliminated, charge residue is avoided after shutdown, and therefore the problem of residual image of white flashing lines or area whitening after startup is solved.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a schematic structural diagram of an apparatus for improving boot image retention according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a detection and control module according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of another detection and control module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a switch module according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a method for improving boot image retention according to an embodiment of the disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can readily appreciate the fact that the forms and details may be varied into a variety of forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited to the contents described in the following embodiments. The embodiments and features of the embodiments in the present disclosure may be arbitrarily combined with each other without conflict.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, one aspect of the present disclosure is not necessarily limited to the dimensions, and the shapes and sizes of the respective components in the drawings do not reflect a true scale. Further, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited. For example, it may be a fixed connection, or a removable connection, or an integral connection; can be a mechanical connection, or an electrical connection; either directly or indirectly through intervening components, or both may be interconnected. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.
In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
"about" in this disclosure means that the limits are not strictly defined, and that the numerical values are within the tolerances allowed for the process and measurement.
As shown in fig. 1, an embodiment of the present disclosure provides an apparatus for improving boot image retention, including: the device comprises a power management module 1, a detection and control module 2, a switch module 3, a grid drive module 4 and a source drive module 5;
a power management module configured to output a common voltage signal at a common voltage output terminal VCOM and a first analog power signal at a first analog power output terminal HAVDD; the common voltage signal is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal is provided for a source electrode driving module;
the detection and control module is configured to send a first control signal to the switch module, the gate driving module and the source driving module if a shutdown signal is detected;
a switch module configured to communicate a connection between the common voltage output terminal and the first analog power supply output terminal under control of a first control signal;
the gate driving module is configured to provide gate driving voltage signals capable of turning on the driving transistors for all the driving transistors of the panel pixel driving circuit under the control of a first control signal;
and the source electrode driving module is configured to set the voltage values on all the data lines of the panel pixel driving circuit to be the voltage value of the first analog power supply signal under the control of the first control signal.
In the above-mentioned embodiment, the switch module is disposed between the common voltage output terminal VCOM of the power management module and the first analog power output terminal HAVDD, and when the detection and control module detects the shutdown signal, the control switch module is communicated with the connection between the common voltage output end and the first analog power supply output end, and controls the gate driving module to turn on all driving transistors of the panel pixel driving circuit and controls the source driving module to set voltages on all data lines of the panel pixel driving circuit to voltage values of the first analog power supply signal, the voltage values of all the pixel electrodes on the panel are equal to the voltage values of the common electrode through the processing, the pixel electrodes and the common electrode discharge synchronously, the voltage difference between the pixel electrodes and the common electrode is eliminated, charge residue is avoided after shutdown, and therefore the problem of residual image of white flashing lines or area whitening after startup is solved.
In some exemplary embodiments, the detection and control module is further configured to send a second control signal to the switch module if the power-on signal is detected;
and the switch module is also configured to disconnect the connection between the common voltage output end and the first analog power supply output end under the control of the second control signal.
In some exemplary embodiments, the first control signal and the second control signal share the same signal output.
In the device for improving boot image retention in the above embodiment, after the detection and control module detects the boot signal, the detection and control module controls the switch module to disconnect the connection between the common voltage output terminal and the first analog power output terminal, so that the pixel driving circuit recovers the driving mode in the normal state.
In some exemplary embodiments, the detection and control module is configured to detect the shutdown signal by: and if the input voltage of the power management module is detected to be reduced to the voltage threshold value from the voltage value in the normal power supply process, judging that the shutdown signal is detected.
In some exemplary embodiments, the detection and control module is configured to detect the power-on signal in the following manner: and if the input voltage of the power management module is detected to be larger than the voltage threshold, judging that the starting-up signal is detected.
In some exemplary embodiments, when the power management module has the power on/off detection circuit built therein, the power management module is further configured to output the power on/off notification signal PMIC _ XON to the detection and control module;
the detection and control module is configured to judge that a shutdown signal is detected when the startup and shutdown notification signal is detected to be a first level signal; and when the power-on/off notification signal is detected to be the second level signal, judging that the power-on signal is detected.
In some exemplary embodiments, as shown in fig. 2, the detection and control module includes: a first resistor R1 and a first switching element Q1;
the first end of the first resistor is connected with the second analog power supply output end AVDD, the second end of the first resistor is connected with the first end of the first switching element and serves as the first output end Vo1 of the detection and control module;
the first terminal of the first switching element is connected to the first output terminal Vo1, the second terminal of the first switching element is grounded, and the control terminal of the first switching element is connected to the power on/off notification signal terminal PMIC _ XON.
When the power management module is internally provided with the on-off detection circuit, the on-off notification signal PMIC _ XON can be directly used for controlling the switch element of the switch module. When the first switch element is turned on, the first output end outputs a low level signal, and when the first switch element is turned off, the first output end outputs a high level signal. The voltage signal of the second analog power output terminal AVDD may be output by the power management module, and a voltage value of the AVDD voltage signal may be higher than a voltage value of the common voltage signal and a voltage value of the first analog power signal.
In some exemplary embodiments, as shown in fig. 3, the detection and control module includes: a first resistor R1, a second resistor R2, a third resistor R3, and a first switching element Q1;
the first end of the first resistor is connected with the second analog power supply output end AVDD, the second end of the first resistor is connected with the first end of the first switching element and serves as the first output end Vo1 of the detection and control module;
a first terminal of the first switching element is connected to a first output terminal Vo1, a second terminal of the first switching element is grounded, and a control terminal of the first switching element is connected to a first node N1;
a first end of the second resistor is connected with a first analog power supply input end VDD, and a second end of the second resistor is connected with a first node N1;
the first end of the third resistor is connected to the first node N1, and the second end of the third resistor is grounded.
When the power management module is not provided with the built-in switch machine detection circuit, the change of the input voltage signal of the first analog power supply input end can be detected through the voltage division circuit formed by the second resistor and the third resistor. Voltage of the first node N1
Suppose the turn-on voltage of the first switching element is VTHWhen the voltage value of the VDD signal is reduced to the threshold voltage VLOWAnd if the shutdown signal is judged to be detected, the detection of the switching machine can be realized by selecting the second resistor and the third resistor with proper resistance values. When the first switch element is turned on, the first output end outputs a low level signal, and when the first switch element is turned off, the first output end outputs a high level signal.
The voltage signal at the first analog power input terminal VDD may be an input voltage signal of the power management module. In other embodiments, the first end of the second resistor may also be connected to any output voltage signal of the power management module, such as the first analog power output terminal HAVDD, the second analog power output terminal AVDD, and the common voltage output terminal VCOM.
In some exemplary embodiments, as shown in fig. 4, the switch module includes: a second switching element Q2;
a first end of the second switching element is connected to the common voltage output terminal VCOM of the power management module, a second end of the second switching element is connected to the first analog power output terminal HAVDD of the power management module, and a control end of the second switching element is connected to the first output terminal Vo1 of the detection and control module.
When the second switching element is turned on, the common voltage output terminal VCOM of the power management module and the first analog power output terminal HAVDD are connected together, and the voltage values of the voltage signals output by the common voltage output terminal VCOM and the first analog power output terminal HAVDD are equal to each other. When the second switching element is turned off, the common voltage output terminal VCOM of the power management module and the first analog power output terminal HAVDD are not connected together, and they can independently output respective voltage signals.
In some exemplary embodiments, a filter capacitor may be connected to the input signal terminal and each output signal terminal of the power management module, so as to prevent the power signal fluctuation from causing misjudgment or misoperation of the detection and control module.
As shown in fig. 5, an embodiment of the present disclosure provides a method for improving boot image retention, including the following steps:
step S10, detecting a shutdown signal;
step S20, if a shutdown signal is detected, the connection between the common voltage output end of the power management module and the first analog power output end is connected, the voltage values of all data lines of the panel pixel driving circuit are set to be the voltage values of the first analog power signal output by the first analog power output end, and all driving transistors of the panel pixel driving circuit are controlled to be conducted; the common voltage signal output by the common voltage output end is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal output by the first analog power supply output end is provided for the source electrode driving module.
In the method for improving the boot-strap residual image in the embodiment, the shutdown signal is detected, if the shutdown signal is detected, the connection between the common voltage output end of the power management module and the first analog power output end is connected, the voltage values on all the data lines of the panel pixel driving circuit are set to be the voltage values of the first analog power signal, all the driving transistors of the panel pixel driving circuit are controlled to be conducted, the voltage values on all the pixel electrodes on the panel are equal to the voltage value on the common electrode through the processing, the pixel electrodes and the common electrode synchronously discharge, the voltage difference between the pixel electrodes and the common electrode is eliminated, the generation of charge residue after shutdown is avoided, and therefore the problem of the flash white line or the residual image with white area after startup is solved.
In some exemplary embodiments, the method further comprises: and if the starting-up signal is detected, disconnecting the connection between the common voltage output end and the first analog power supply output end.
In some exemplary embodiments, detecting a shutdown signal includes: and if the input voltage of the power management module is detected to be reduced to the voltage threshold value from the voltage value in the normal power supply process, judging that the shutdown signal is detected.
In some exemplary embodiments, detecting a shutdown signal includes: when the power-on and power-off notification signal is detected to be a first level signal, judging that a power-off signal is detected; the power-on/off notification signal is generated by a power-on/off detection circuit built in the power module.
In some exemplary embodiments, detecting a power-on signal includes: and if the input voltage of the power management module is detected to be larger than the voltage threshold, judging that the starting-up signal is detected.
In some exemplary embodiments, detecting a power-on signal includes: when the power-on/off notification signal is detected to be a second level signal, judging that the power-on signal is detected; the power-on/off notification signal is generated by a power-on/off detection circuit built in the power module.
The embodiment of the disclosure also provides a display device, which comprises the device for improving the boot-strap afterimage.
The display device may be a Liquid Crystal (LCD) display device. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.
Although the embodiments disclosed in the present disclosure are described above, the descriptions are only for the convenience of understanding the present disclosure, and are not intended to limit the present disclosure. It will be understood by those skilled in the art of the present disclosure that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure is to be limited only by the terms of the appended claims.
Claims (10)
1. An apparatus for improving boot image retention, comprising: the device comprises a power management module, a detection and control module, a switch module, a grid driving module and a source driving module;
the power supply management module is configured to output a common voltage signal at a common voltage output end and output a first analog power supply signal at a first analog power supply output end; the common voltage signal is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal is provided for a source electrode driving module;
the detection and control module is configured to send a first control signal to the switch module, the gate driving module and the source driving module if a shutdown signal is detected;
a switch module configured to communicate a connection between the common voltage output terminal and the first analog power supply output terminal under control of a first control signal;
the gate driving module is configured to provide gate driving voltage signals capable of turning on the driving transistors for all the driving transistors of the panel pixel driving circuit under the control of a first control signal;
and the source electrode driving module is configured to set the voltage values on all the data lines of the panel pixel driving circuit to be the voltage value of the first analog power supply signal under the control of the first control signal.
2. The apparatus of claim 1, wherein:
the detection and control module is also configured to send a second control signal to the switch module if the starting signal is detected;
and the switch module is also configured to disconnect the connection between the common voltage output end and the first analog power supply output end under the control of the second control signal.
3. The apparatus of claim 1, wherein:
the detection and control module is configured to detect the shutdown signal in the following way: and if the input voltage of the power management module is detected to be reduced to the voltage threshold value from the voltage value in the normal power supply process, judging that the shutdown signal is detected.
4. The apparatus of claim 2, wherein:
the detection and control module is configured to detect the starting signal in the following mode: and if the input voltage of the power management module is detected to be larger than the voltage threshold, judging that the starting-up signal is detected.
5. The apparatus of claim 2, wherein:
when the power supply management module is internally provided with a startup and shutdown detection circuit, the power supply management module is also configured to output a startup and shutdown notification signal to the detection and control module;
the detection and control module is configured to judge that a shutdown signal is detected when the startup and shutdown notification signal is detected to be a first level signal; and when the power-on/off notification signal is detected to be the second level signal, judging that the power-on signal is detected.
6. The apparatus of claim 2, wherein:
the detection and control module comprises: a first resistor, a second resistor, a third resistor, and a first switching element;
the first end of the first resistor is connected with the output end of the second analog power supply, and the second end of the first resistor is connected with the first end of the first switching element and is used as the first output end of the detection and control module;
a first end of the first switch element is connected with a first output end, a second end of the first switch element is grounded, and a control end of the first switch element is connected with a first node;
the first end of the second resistor is connected with the first analog power supply input end of the power supply management module, and the second end of the second resistor is connected with the first node;
the first end of the third resistor is connected with the first node, and the second end of the third resistor is grounded.
7. The apparatus of claim 2, wherein:
the detection and control module comprises: a first resistor and a first switching element;
the first end of the first resistor is connected with the output end of the second analog power supply, and the second end of the first resistor is connected with the first end of the first switching element and is used as the first output end of the detection and control module;
the first end of the first switch element is connected with a first output end, the second end of the first switch element is grounded, and the control end of the first switch element is connected with a power on/off notification signal end;
the power on/off notification signal end is an output signal end when the power management module is internally provided with the power on/off detection circuit.
8. The apparatus of claim 6 or 7, wherein:
the switch module includes: a second switching element;
the first end of the second switch element is connected with the public voltage output end of the power management module, the second end of the second switch element is connected with the first analog power output end of the power management module, and the control end of the second switch element is connected with the first output end of the detection and control module.
9. A method for improving boot-strap afterimage, comprising:
detecting a shutdown signal;
if the shutdown signal is detected, the connection between the common voltage output end of the power management module and the first analog power output end is communicated, the voltage values of all data lines of the panel pixel driving circuit are set to be the voltage value of the first analog power signal output by the first analog power output end, and all driving transistors of the panel pixel driving circuit are controlled to be conducted;
the common voltage signal output by the common voltage output end is provided for a common electrode of a panel pixel driving circuit, and the first analog power supply signal output by the first analog power supply output end is provided for the source electrode driving module.
10. A display device comprising the apparatus for improving boot afterimage according to any one of claims 1 to 8.
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| CN114267311A (en) * | 2021-12-29 | 2022-04-01 | 惠科股份有限公司 | Source electrode driving circuit, source electrode driving method and display panel |
| CN114708840A (en) * | 2022-03-31 | 2022-07-05 | 福州京东方光电科技有限公司 | Display driving method, driving circuit and display device |
| CN114708840B (en) * | 2022-03-31 | 2023-10-24 | 福州京东方光电科技有限公司 | Display driving method, driving circuit and display device |
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