CN109523973B - Common voltage generating circuit and display panel - Google Patents
Common voltage generating circuit and display panel Download PDFInfo
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- CN109523973B CN109523973B CN201811589098.3A CN201811589098A CN109523973B CN 109523973 B CN109523973 B CN 109523973B CN 201811589098 A CN201811589098 A CN 201811589098A CN 109523973 B CN109523973 B CN 109523973B
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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
Abstract
The invention relates to a common voltage generating circuit and a display panel. The common voltage generating circuit includes: the first output module is used for setting data of a first common voltage and outputting the first common voltage; and the second output module is used for outputting a second common voltage according to the set data of the first common voltage and the preset voltage difference. The problem of two public voltages of traditional public voltage generating circuit adjustment respectively, make two public voltages keep fixed difference, lead to controlling complicacy has effectively been solved to this application.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a common circuit generating circuit and a display panel.
Background
Generally, the liquid crystal display panel comprises a liquid crystal capacitor and a storage capacitor, a common electrode of the liquid crystal capacitor and a common electrode of the storage capacitor are connected with a common voltage generating circuit, and the common voltage received by the liquid crystal capacitor is used for adjusting voltages at two ends of liquid crystal so as to deflect liquid crystal molecules, and different angles of deflection of the liquid crystal molecules cause different transmitted light rays, so that different gray scales are generated, and the display of a required picture is realized; the common voltage received by the storage capacitor is used for charging the storage capacitor, so that the voltage of the liquid crystal capacitor cannot meet the voltage required for image display when image data is updated next time, therefore, the common voltage of the common electrode of the liquid crystal capacitor and the common electrode of the storage capacitor needs to keep a fixed voltage difference, and the image residue phenomenon is prevented.
At present, a scheme of a dual common electrode is proposed, that is, a fixed voltage difference is ensured by adjusting the voltage of the common electrode of the liquid crystal capacitor and the voltage of the common electrode of the storage capacitor, respectively, but the precision of the voltage difference obtained by the control method is not high, and the control is complicated.
Disclosure of Invention
The invention aims to provide a common voltage generating circuit and a display panel which are easy to control.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a common voltage generating circuit comprising:
the first output module is used for setting data of a first common voltage and outputting the first common voltage; and
and the second output module is used for outputting a second common voltage according to the set data of the first common voltage and a preset voltage difference.
In one embodiment, the first output module includes a first digital-to-analog conversion unit for converting a reference voltage into a first common voltage with an accuracy of n bits according to first common voltage setting data;
the second output module comprises a second digital-to-analog conversion unit for converting a reference voltage into a second common voltage with an accuracy of n bits according to second common voltage setting data;
and the second public voltage setting data is obtained according to the first public voltage setting data and the preset voltage difference.
In one embodiment, the common voltage generating circuit further includes:
the setting module is used for providing the first public voltage setting data and the preset voltage difference according to input data; and
and the conversion module is connected with the setting module and used for outputting the second public voltage setting data according to the first public voltage setting data and the preset voltage difference.
In one embodiment, the specific formula for outputting the second common voltage setting data according to the first common voltage setting data and the preset voltage difference is as follows:
b is the second common voltage setting data, a the first common voltage setting data, Δ V the preset voltage difference, VREFThe reference voltage.
In one embodiment, the first output module further comprises:
the first driving unit is connected with the first digital-to-analog conversion unit and used for improving the output capacity of the first public voltage;
the second output module further comprises:
and the second driving unit is connected with the second digital-to-analog conversion unit and used for improving the output capacity of the second common voltage.
In one embodiment, the first driving unit and the second driving unit are current amplifiers.
In one embodiment, the first output module is connected to a common electrode of a liquid crystal capacitor, and is configured to provide the first common voltage to the common electrode of the liquid crystal capacitor;
the second output module is connected with the common electrode of the storage capacitor and used for providing the second common voltage for the common electrode of the storage capacitor.
In one embodiment, the first output module is connected to a common electrode of a storage capacitor, and is configured to provide the first common voltage to the common electrode of the storage capacitor;
the second output module is connected with a common electrode of the liquid crystal capacitor and used for providing the second common voltage for the common electrode of the liquid crystal capacitor.
In order to realize the purpose of the invention, the invention also adopts the following technical scheme:
a common voltage generating circuit comprising:
the setting module is used for providing first public voltage setting data and preset voltage difference according to input data;
the conversion module is connected with the setting module and used for outputting second public voltage setting data according to the first public voltage setting data and the preset voltage difference;
a first output module including a first digital-to-analog conversion unit for converting a reference voltage into the first common voltage with an accuracy of n bits according to the first common voltage setting data;
a second output module including a second digital-to-analog conversion unit for converting a reference voltage into the second common voltage with an accuracy of n bits according to the second common voltage setting data;
wherein the reference voltage is greater than the first common voltage and the second common voltage, respectively.
In order to realize the purpose of the invention, the invention also adopts the following technical scheme:
a display panel comprising a common voltage generating circuit as described above.
The public voltage generating circuit comprises a first output module and a second output module, wherein the first output module is used for setting data of a first public voltage and outputting the first public voltage, the second output module is used for outputting a second public voltage according to the set data of the first public voltage and a preset voltage difference, the public voltage generating circuit is used for providing the public voltage for a storage capacitor and a public electrode of a liquid crystal capacitor in a display panel, two public voltages are generated, only one public voltage needs to be adjusted during adjustment, the other public voltage is linked according to the preset fixed voltage difference, and the problem that the control is complex due to the fact that the two public voltages are adjusted respectively by a traditional public voltage generating circuit and are kept at the fixed difference is effectively solved.
Drawings
Fig. 1 is a schematic structural diagram of a common voltage generating circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a common voltage generating circuit according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a common voltage generating circuit according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of a common voltage generating circuit according to yet another embodiment of the present application.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a common voltage generating circuit according to an embodiment of the present disclosure.
In the present embodiment, the common voltage generating circuit includes a first output block 10 and a second output block 20.
The first output module 10 is configured to set the data 110 of the first common voltage and output the first common voltage 120.
And a second output module 20 for outputting a second common voltage 220 according to the setting data 110 of the first common voltage and the preset voltage difference 210.
In the present embodiment, the first output module 10 refers to a module capable of setting data of the first common voltage and outputting the first common voltage according to the data; the second output module 20 refers to a module capable of outputting the second common voltage according to the setting data of the first common voltage and the preset voltage difference.
The common voltage generating circuit comprises a first output module 10 and a second output module 20, wherein the first output module 10 is used for setting data 110 of a first common voltage and outputting a first common voltage 120, the second output module 20 is used for outputting a second common voltage 220 according to the set data 110 of the first common voltage and a preset voltage difference 210, the common voltage generating circuit is used for respectively providing common voltages for common electrodes of a storage capacitor and a liquid crystal capacitor in a display panel and outputting two common voltages, only one common voltage needs to be adjusted during adjustment, and the other common voltage is linked according to the preset fixed voltage difference.
In one embodiment, referring to fig. 2, fig. 2 is a schematic structural diagram of a common voltage generating circuit in another embodiment of the present application, and the first output module 10 includes a first digital-to-analog converting unit 100 for converting the reference voltage V with n-bit precision according to the first common voltage setting data 110REFInto the first common voltage 120.
A second output module 20 including a second D/A conversion unit 200 for converting the reference voltage V with an accuracy of n bits according to the second common voltage setting dataREFInto a second common voltage 220.
Wherein the second common voltage setting data is obtained according to the first common voltage setting data 110 and the preset voltage difference 210.
In this embodiment, the first digital-to-analog converting unit 100 and the second digital-to-analog converting unit 200 are digital-to-analog converters, specifically n-bit data converters, wherein the first digital-to-analog converting unit 100 is mainly used for converting the first common voltage setting data 110 into the reference voltage V with the accuracy of n bitsREFIs converted into the first common voltage 120, i.e. the reference voltage V to be set by the first DAC unit 100REFIs divided into 2nEqual parts, each equal part having a reference voltage of
When the first common voltage setting data is a, the first digital-to-analog conversion unit 100 converts the digital voltage set by the first common voltage into an analog voltage, and the first common voltage output by the first digital-to-analog conversion unit 100 is
The second digital-to-analog conversion unit 200 converts the reference voltage V to the accuracy of n bits according to the second common voltage setting data 230REFAnd converted into a second common voltage 220, wherein the second common voltage setting data is obtained according to the first common voltage setting data 110 and the preset voltage difference 210, thereby ensuring that a difference between the first common voltage and the second common voltage is constant.
In one embodiment, referring to fig. 3, fig. 3 is a schematic structural diagram of a common voltage generating circuit in another embodiment of the present application, and the common voltage generating circuit further includes a setting module 30 and a scaling module 40.
The setting module 30 is configured to provide the first common voltage setting data 110 and the preset voltage difference 210 according to the input data.
And a scaling module 40, connected to the setting module 30, for outputting second common voltage setting data 230 according to the first common voltage setting data 110 and the preset voltage difference 210.
In this embodiment, the setting module 30 may be a memory, and data to be set is stored in the memory; the scaling module 30 is configured to output second common voltage setting data 230 according to the first common voltage setting data 110 and the preset voltage difference 210, and the specific formula is as follows:
b is the second common voltage setting data 230, a is the first common voltage setting data 110, Δ V is the preset voltage difference 210, VREFA reference voltage.
Before obtaining the first common voltage 120, the value of the preset voltage difference Δ V needs to be converted into corresponding data, because the reference voltage of each equal part is
The predetermined pressure difference may be equally divided into
Since the first common voltage setting data is a, the second common voltage setting data b outputted by the scaling module 40 is
The second common voltage setting data b passes through the second DAC unit 200, and the second DAC unit 200 sets the reference voltage VREFIs divided into 2nEqual parts, each equal part having a reference voltage of
When the second common voltage setting data is b, the second digital-to-analog converting unit 200 converts the digital voltage set by the second common voltage into an analog voltage, and the second common voltage output by the second digital-to-analog converting unit 200 is b
Wherein the reference voltage VREFGreater than the first common voltage 120 and the second common voltage 220.
Therefore, the first common voltage output by the first DAC unit 100 is
The second digital-to-analog conversion unit 200 outputs the second common voltage of
The voltage difference between the first common voltage 120 and the second common voltage 220 outputted from the common voltage generation circuit is
Wherein the content of the first and second substances,
the voltage difference between the first common voltage 120 and the second common voltage is Δ V, and the voltage difference is a set value and is also a fixed value, so that the difference between the first common voltage 120 and the second common voltage 220 is ensured to be constant.
In an embodiment, referring to fig. 4, fig. 4 is a schematic structural diagram of a common voltage generating circuit in yet another embodiment of the present application, and the first output module 10 further includes:
and a first driving unit 130 connected to the first digital-to-analog converting unit 100 for improving the output capability of the first common voltage 120.
The second output module 20 further includes: and a second driving unit 230 connected to the second digital-to-analog converting unit 100 for improving the output capability of the second common voltage 220. The first driving unit 130 and the second driving unit 230 include, but are not limited to, current amplifiers.
In this embodiment, since the first common voltage 120 generated by the first digital-to-analog conversion unit 100 and the second common voltage 220 generated by the second digital-to-analog conversion unit 200 are common voltages provided for the display panel 20, the common voltage has a small driving capability, and the added first driving unit and second driving unit may be current amplifiers, which ensure that currents of 100mA or more are output, thereby enhancing the output capability of the common voltages.
In one embodiment, the first output module 10 is connected to a common electrode of the liquid crystal capacitor for providing the first common voltage 120 to the common electrode of the liquid crystal capacitor.
The second output module 20 is connected to the common electrode of the storage capacitor for providing a second common voltage 220 to the common electrode of the storage capacitor.
In one embodiment, the first output module 10 is connected to the common electrode of the storage capacitor for providing a first common voltage to the common electrode of the storage capacitor.
The second output module 20 is connected to the common electrode of the liquid crystal capacitor for providing a second common voltage 220 to the common electrode of the liquid crystal capacitor.
In this embodiment, the liquid crystal panel includes a liquid crystal capacitor and a storage capacitor, where the storage capacitor is used to keep the voltage of the liquid crystal capacitor until the next time of updating the picture data, a common electrode of the liquid crystal capacitor and a common electrode of the storage capacitor are connected to a common voltage generating circuit, and the liquid crystal capacitor receives the common voltage to adjust the voltages at two ends of the liquid crystal so as to deflect the liquid crystal molecules and the angles of deflection of the liquid crystal molecules are different, so that the transmitted light beams are different, thereby generating different gray scales and realizing the display of the required picture; the common voltage received by the storage capacitor is used for charging the storage capacitor, so that the voltage of the liquid crystal capacitor cannot meet the voltage required for image display when image data is updated next time, therefore, the common voltage of the common electrode of the liquid crystal capacitor and the common electrode of the storage capacitor needs to keep a fixed voltage difference, the liquid crystal display device is prevented from displaying the same fixed image for a long time, and when the image is switched to the next image, the image of the previous image can be hidden and remained, so that the image is remained.
Therefore, when the first output module 10 of the common voltage generating circuit is connected to the common electrode of the liquid crystal capacitor for providing the first common voltage 120 to the common electrode of the liquid crystal capacitor, and the second output module 20 is connected to the common electrode of the storage capacitor for providing the second common voltage 220 to the common electrode of the storage capacitor, the common voltage of the common electrode of the storage capacitor is linked according to the preset fixed voltage difference only by adjusting the common voltage to the common electrode of the liquid crystal capacitor; when the first output module 10 of the common voltage generating circuit is connected with the common electrode of the storage capacitor and is used for providing the first common voltage 120 for the common electrode of the storage capacitor, the second output module 20 is connected with the common electrode of the liquid crystal capacitor and is used for providing the second common voltage 220 for the common electrode of the liquid crystal capacitor, so that only the common voltage for the common electrode of the storage capacitor needs to be adjusted, and the common voltage of the common electrode of the liquid crystal capacitor is linked according to a preset fixed voltage difference, thereby effectively solving the problem that the control is complicated because the two common voltages are respectively adjusted by the traditional common voltage generating circuit and are kept at the fixed difference.
The application also provides a common voltage generating circuit, which comprises a setting module 30, a scaling module 40, a first output module 10 and a second output module 20.
The setting module 30 is configured to provide the first common voltage setting data 110 and the preset voltage difference 210 according to the input data.
And a scaling module 40, connected to the setting module 30, for outputting second common voltage setting data 230 according to the first common voltage setting data 110 and the preset voltage difference 210.
The first output module 10 includes a first digital-to-analog conversion unit 100 for converting the reference voltage into a first common voltage 120 with n-bit precision according to the first common voltage setting data 110.
The second output module 20 includes a second digital-to-analog conversion unit 200 for converting the reference voltage into a second common voltage 220 with an accuracy of n bits according to second common voltage setting data 230.
Wherein the reference voltage is greater than the first common voltage 120 and the second common voltage 220, respectively.
The common voltage generating circuit comprises a first output module 10 and a second output module 20, wherein the first output module 10 is used for converting a reference voltage into a first common voltage 120 with n-bit precision according to first common voltage setting data 110, the second output module is used for outputting a second common voltage 220 according to the setting data of the first common voltage and a preset voltage difference, the common voltage generating circuit is used for providing common voltages for common electrodes of a storage capacitor and a liquid crystal capacitor in a display panel, two kinds of common voltages are generated, only one kind of common voltage needs to be adjusted during adjustment, the other kind of common voltage is linked according to a preset fixed voltage difference, and the problem that the two kinds of common voltages are adjusted respectively by a traditional common voltage generating circuit, so that the two kinds of common voltages keep a fixed difference value, and control is complex is effectively solved.
The application also provides a display panel comprising the common voltage generating circuit.
The display panel comprises the common voltage generating circuit, two common voltages with fixed voltage difference are output through one common voltage generating circuit, the control is simple, and the problem of image retention can be prevented from being solved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A common voltage generating circuit, comprising:
a first output module for setting first common voltage setting data and outputting a first common voltage; and
the second output module is used for outputting a second public voltage according to second public voltage setting data, and the second public voltage setting data are obtained according to the first public voltage setting data and a preset voltage difference;
maintaining a fixed difference between the first common voltage and the second common voltage;
the first output module and the second output module are respectively connected with a common electrode of a storage capacitor and a liquid crystal capacitor in the display panel.
2. The common voltage generating circuit according to claim 1,
the first output module comprises a first digital-to-analog conversion unit, and is used for converting a reference voltage into a first common voltage according to first common voltage setting data with the accuracy of n bits;
the second output module comprises a second digital-to-analog conversion unit for converting a reference voltage into a second common voltage with an accuracy of n bits according to second common voltage setting data;
and the second public voltage setting data is obtained according to the first public voltage setting data and the preset voltage difference.
3. The common voltage generating circuit according to claim 2, further comprising:
the setting module is used for providing the first public voltage setting data and the preset voltage difference according to input data; and
and the conversion module is connected with the setting module and used for outputting the second public voltage setting data according to the first public voltage setting data and the preset voltage difference.
4. The common voltage generating circuit according to claim 3,
the specific formula for outputting the second common voltage setting data according to the first common voltage setting data and the preset voltage difference is as follows:
b is the second common voltage setting data, a is the first common voltage setting data, Δ V is the preset voltage difference, VREFIs the reference voltage.
5. The common voltage generating circuit according to claim 2, wherein the first output module further comprises:
the first driving unit is connected with the first digital-to-analog conversion unit and used for improving the output capacity of the first public voltage;
the second output module further comprises:
and the second driving unit is connected with the second digital-to-analog conversion unit and used for improving the output capacity of the second common voltage.
6. The common voltage generating circuit according to claim 5, wherein the first driving unit and the second driving unit are current amplifiers.
7. The common voltage generating circuit according to claim 1,
the first output module is connected with a common electrode of a liquid crystal capacitor and used for providing the first common voltage for the common electrode of the liquid crystal capacitor;
the second output module is connected with the common electrode of the storage capacitor and used for providing the second common voltage for the common electrode of the storage capacitor.
8. The common voltage generating circuit according to claim 1,
the first output module is connected with a common electrode of a storage capacitor and used for providing the first common voltage for the common electrode of the storage capacitor;
the second output module is connected with a common electrode of the liquid crystal capacitor and used for providing the second common voltage for the common electrode of the liquid crystal capacitor.
9. A common voltage generating circuit, comprising:
the setting module is used for providing first public voltage setting data and preset voltage difference according to input data;
the conversion module is connected with the setting module and used for outputting second public voltage setting data according to the first public voltage setting data and the preset voltage difference;
a first output module including a first digital-to-analog conversion unit for converting a reference voltage into the first common voltage with an accuracy of n bits according to the first common voltage setting data;
a second output module including a second digital-to-analog conversion unit for converting a reference voltage into the second common voltage with an accuracy of n bits according to the second common voltage setting data;
wherein the reference voltage is greater than the first common voltage and the second common voltage, respectively;
maintaining a fixed difference between the first common voltage and the second common voltage;
the first output module and the second output module are respectively connected with a common electrode of a storage capacitor and a liquid crystal capacitor in the display panel.
10. A display panel comprising the common voltage generating circuit according to any one of claims 1 to 9.
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| KR100488453B1 (en) * | 2002-12-26 | 2005-05-11 | 엘지.필립스 엘시디 주식회사 | Liquid Crystal Display Device And Method Of Driving Thereof |
| KR20050005903A (en) * | 2003-07-07 | 2005-01-15 | 삼성전자주식회사 | Driving Device for Liquid Crystal Display |
| JP2007065647A (en) * | 2005-08-30 | 2007-03-15 | Samsung Electronics Co Ltd | Liquid crystal display device, and module for driving the same and method of driving the same |
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| CN101382711B (en) * | 2007-09-07 | 2010-07-14 | 北京京东方光电科技有限公司 | Method and device for improving image retention of thin film transistor LCD |
| TWI416498B (en) * | 2010-12-30 | 2013-11-21 | Au Optronics Corp | Liquid crystal display and driving method thereof |
| CN103295540B (en) * | 2012-06-07 | 2015-06-10 | 上海天马微电子有限公司 | Driving method, driving device and display for active matrix display panel |
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