CN114141211A - Gamma voltage generation circuit, source electrode drive circuit and display panel - Google Patents

Gamma voltage generation circuit, source electrode drive circuit and display panel Download PDF

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Publication number
CN114141211A
CN114141211A CN202111544727.2A CN202111544727A CN114141211A CN 114141211 A CN114141211 A CN 114141211A CN 202111544727 A CN202111544727 A CN 202111544727A CN 114141211 A CN114141211 A CN 114141211A
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voltage
gamma voltage
circuit
gamma
pixel
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CN202111544727.2A
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CN114141211B (en
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高翔
李荣荣
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HKC Co Ltd
Changsha HKC Optoelectronics Co Ltd
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HKC Co Ltd
Changsha HKC Optoelectronics 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
    • G09G3/36—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
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (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)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The application provides a Gamma voltage generation circuit and method, a source electrode driving circuit and a display panel. The Gamma voltage generating circuit comprises a voltage acquisition circuit and a Gamma voltage negative feedback circuit; the voltage acquisition circuit is connected with a common electrode of the color film substrate to acquire a feedback voltage of the common voltage; the Gamma voltage negative feedback circuit is provided with a same-phase end, an inverting end and an output end; the in-phase end is electrically connected with the Gamma voltage generation circuit, and the inverting end is electrically connected with the voltage acquisition circuit so as to receive the feedback voltage of the public voltage; the output end of the Gamma voltage negative feedback circuit outputs the regulated Gamma voltage as the reference voltage of the source electrode driving circuit; the fluctuation of the adjusted Gamma voltage and the fluctuation of the common electrode feedback voltage are in inverse phase change so as to at least partially offset the influence of the fluctuation of the common voltage on the liquid crystal voltage, thereby effectively improving the horizontal crosstalk of the liquid crystal display panel.

Description

Gamma voltage generation circuit, source electrode drive circuit and display panel
Technical Field
The present disclosure relates to the field of liquid crystal display technologies, and in particular, to a Gamma voltage generating circuit and method, a source driver circuit, a display panel, and a display device.
Background
The color film substrate of the display panel can cover one side of the color resistors of the display panel, which faces the liquid crystal, wherein each color resistor is opposite to one pixel electrode, and the liquid crystal is arranged between the color resistors and the pixel electrodes. And the color film substrate is provided with a common electrode, and when the voltage difference between the pixel electrode and the common electrode is increased continuously, an electric field with the electric field force facing one of the electrodes is formed between the pixel electrode and the common electrode, so that the liquid crystal is driven to deflect.
The display panel typically further includes scan lines and data lines. When the display panel works, the scanning lines receive scanning signals on the driving device, and then the sub-pixels are opened line by line. Meanwhile, the data line receives a data signal on the driving device, and further charges the pixel electrode of each sub-pixel when each row of sub-pixels is opened.
However, in the conventional LCD panel, since a coupling capacitor exists between the data line and the common electrode of the color film substrate, when the data line jumps from a gray level to a white screen, the voltage of the common electrode is disturbed and cannot be quickly recovered, so that the horizontal crosstalk phenomenon occurs on the panel, and thus, the voltage difference between the pixel electrode and the common electrode changes, and the horizontal crosstalk phenomenon occurs.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
An object of the present application is to improve horizontal crosstalk of a liquid crystal display panel.
In order to solve the technical problem, the following technical scheme is adopted in the application:
according to an aspect of the present application, there is provided a Gamma voltage generation circuit including:
the voltage acquisition circuit is connected with a common electrode of the color film substrate to acquire a feedback voltage of the common voltage;
a Gamma voltage negative feedback circuit having a non-inverting terminal, an inverting terminal and an output terminal; the in-phase end is connected with a Gamma voltage end to receive initial Gamma voltage, and the inverting end is electrically connected with the voltage acquisition circuit to receive the feedback voltage of the public voltage;
the output end of the negative feedback circuit outputs the adjusted Gamma voltage as the reference voltage of the source electrode driving circuit; the fluctuation of the adjusted Gamma voltage and the fluctuation of the feedback voltage of the public voltage are in inverse phase change, so that the influence of the fluctuation of the public voltage on the liquid crystal voltage is at least partially counteracted.
According to an embodiment of the present application, the Gamma voltage negative feedback circuit includes an operational amplifier and a first resistor;
the in-phase end of the operational amplifier is used for connecting the Gamma voltage end, the inverting end of the operational amplifier is used for electrically connecting the voltage acquisition circuit, and the output end of the operational amplifier outputs the regulated Gamma voltage;
the first end of the first resistor is connected to the output end of the operational amplifier, and the second end of the first resistor is connected to the inverting end of the operational amplifier.
According to an embodiment of the present application, the Gamma voltage negative feedback circuit further includes a second resistor, a first end of the second resistor is connected to the inverting terminal of the operational amplifier, and a second end of the second resistor is electrically connected to the voltage acquisition circuit.
According to an embodiment of the present application, the Gamma voltage negative feedback circuit further includes a first capacitor, and the first capacitor is connected between the second end of the second resistor and the voltage acquisition circuit.
According to an embodiment of the present application, the Gamma voltage terminal includes a negative polarity terminal, and the output terminal of the Gamma voltage negative feedback circuit outputs the adjusted negative polarity voltage of the Gamma voltage to compensate the voltage crosstalk of the partial black display.
According to an embodiment of the present application, the Gamma voltage terminal includes a positive polarity terminal, and the output terminal of the Gamma voltage negative feedback circuit outputs the positive polarity voltage of the adjusted Gamma voltage to compensate for voltage crosstalk of the off-white display.
According to an embodiment of the present application, the source driving circuit transmits a data signal to the pixel electrode through the data wire;
the parasitic capacitance of the data conductor is less than or equal to the first capacitance.
The application also provides a Gamma voltage generation method, which is used for obtaining the feedback voltage of the common voltage on the common electrode of the color film substrate;
inputting the feedback voltage of the public voltage to an inverting terminal of a negative feedback circuit, and inputting a Gamma voltage terminal to a non-inverting terminal of the negative feedback circuit;
connecting the output end of the Gamma voltage negative feedback circuit to a reference voltage end of a source electrode driving circuit so as to take the regulated Gamma voltage as the reference voltage of the source electrode driving circuit; the fluctuation of the adjusted Gamma voltage and the fluctuation of the common electrode feedback voltage are in inverse phase change, so that the influence of the fluctuation of the common voltage on the liquid crystal voltage is at least partially counteracted.
This application another aspect still provides a source drive circuit, pixel array unit includes first, second and third pixel unit, and the corresponding first, second and third pixel electrode that is provided with respectively, source drive circuit includes Gamma voltage generation circuit, provides Gamma voltage to first, second and third pixel electrode respectively, wherein, Gamma voltage generation circuit does Gamma voltage generation circuit.
Another aspect of the present application further provides a display panel, including:
the pixel array unit comprises a first pixel unit, a second pixel unit and a third pixel unit which correspond to a first color, a second color and a third color, and the pixel array unit is correspondingly provided with a first pixel electrode, a second pixel electrode and a third pixel electrode;
a gate driving circuit supplying a scan signal to the pixel array unit;
a source driving circuit supplying a data signal to the pixel array unit; the source driving circuit is the source driving circuit.
The application also provides a display device which comprises a backlight unit, the display panel and a shell for accommodating the backlight unit and the display panel; wherein the backlight unit is used for providing backlight light source for the display panel.
According to the scheme, the voltage acquisition circuit is arranged to acquire the feedback voltage of the public voltage and transmit the feedback voltage to the inverting end of the Gamma voltage negative feedback circuit, meanwhile, the initial Gamma voltage is input at the in-phase end of the Gamma voltage negative feedback circuit, the initial Gamma voltage is adjusted based on the feedback voltage of the public voltage, the fluctuation of the regulated Gamma voltage output by the negative feedback circuit and the fluctuation of the feedback voltage of the public voltage are in inverse transformation, and the influence of the fluctuation of the public voltage on the liquid crystal voltage is at least partially counteracted. The invention for solving the technical problem of horizontal crosstalk of the liquid crystal voltage is not directly compensated for the common voltage, but is compensated for the Gamma voltage, the compensated Gamma voltage acts on the pixel electrode through a lead, and compared with the scheme for directly compensating the common voltage in the related technology, as the capacitor connected with the common electrode on the color film substrate is fully paved on the whole plate surface, the capacitance value is large, and the compensation response delay of the common voltage is caused. Therefore, the method for improving the horizontal crosstalk according to the embodiment can have a faster compensation response and improve the compensation effect of the horizontal crosstalk.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a circuit block diagram of a Gamma voltage generation circuit according to an embodiment.
Fig. 2 is a waveform corresponding diagram of the data line voltage, the common voltage, the adjusted positive polarity terminal of the Gamma voltage, the adjusted Gamma voltage, and the liquid crystal voltage.
Fig. 3 is a circuit diagram illustrating a Gamma voltage generation circuit according to an embodiment.
Fig. 4 is a schematic structural diagram illustrating a structure of transmitting an adjusted Gamma voltage to a source driver circuit according to an embodiment.
FIG. 5 is a waveform diagram of the data line voltage, the common voltage, the positive polarity end of the adjusted Gamma voltage, the negative polarity end of the adjusted Gamma voltage, and the liquid crystal voltage.
Fig. 6 is a flowchart illustrating a Gamma voltage generation method according to an embodiment.
Fig. 7 is an exploded view of a display device according to an embodiment.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.
Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
The preferred embodiments of the present application will be further described in detail below with reference to the accompanying drawings of the present specification.
The display panel typically includes a plurality of different color sub-pixels, such as a red sub-pixel, a green sub-pixel, a blue sub-pixel, and so on. A plurality of different colored sub-pixels may form one display element. The sub-pixels of the various colors within a display unit cooperate so that the display unit can display any desired color. Meanwhile, all the sub-pixels of the display panel are sequentially arranged in a plurality of rows, and the number of the sub-pixels in each row is multiple. The sub-pixels may include a pixel electrode, a common electrode, and liquid crystal molecules therebetween.
The display panel typically further includes scan lines and data lines. When the display panel works, the scanning lines receive scanning signals on the driving device, and then the sub-pixels are opened line by line. Meanwhile, the data line receives a data signal on the driving device, and further charges the pixel electrode of each sub-pixel when each row of sub-pixels is opened. When the pixel electrode receives the data signal, the common electrode receives a common voltage VCOM on the driving device, and a voltage difference is generated between the pixel electrode and the common electrode, so that the liquid crystal molecules are deflected to transmit light for display.
In the related art, when the common voltage is changed due to interference of voltage change of the data line, the common voltage on the common electrode is usually taken as a focus point, the current common voltage is collected, and the offset of the common voltage is compensated through a negative feedback circuit, so that the common voltage is restored to be stable under the action of negative feedback, and horizontal crosstalk is improved. However, since the size of the panel is larger nowadays, the resistance-capacitance coefficient connected to the common electrode on the color filter substrate is larger, and therefore, the common voltage cannot be compensated in time by the common voltage compensation method, and the problem of improving the crosstalk of the liquid crystal voltage level is not obvious.
Referring to fig. 1, fig. 1 is a circuit block diagram of a Gamma voltage generating circuit according to an embodiment. The application provides a Gamma voltage generation circuit for improving the problem of crosstalk of liquid crystal voltage levels. The invention for solving the technical problem is characterized in that the compensation is not directly carried out on the common voltage VCOM, but carried out on the Gamma voltage, the compensated Gamma voltage and the common voltage VCOM disturbed by the data line voltage act on the liquid crystal together, the influences of the Gamma voltage and the common voltage VCOM on the liquid crystal are mutually counteracted, and the effect of reducing or eliminating the horizontal crosstalk is achieved.
In one embodiment, the Gamma voltage generating circuit includes a voltage collecting circuit 12, a Gamma voltage negative feedback circuit 11; the voltage acquisition circuit 12 is connected with a common electrode of the color film substrate 20 to acquire a Feedback voltage VCOM Feedback of a common voltage VCOM; a Gamma voltage negative feedback circuit 11 having a non-inverting terminal, an inverting terminal and an output terminal GM _ O; the in-phase end is electrically connected with the Gamma voltage generation circuit, and the inverting end is electrically connected with the voltage acquisition circuit so as to receive a Feedback voltage VCOM Feedback of a common voltage VCOM; the output end GM _ O of the Gamma voltage negative feedback circuit 11 outputs the adjusted Gamma voltage as the reference voltage of the source driving circuit 30; the fluctuation of the adjusted Gamma voltage and the fluctuation of the common electrode Feedback voltage VCOM Feedback are in inverse phase change, so as to at least partially offset the influence of the fluctuation of the common voltage VCOM on the liquid crystal voltage.
Referring to fig. 2, fig. 2 is a waveform diagram of a data line voltage, a common voltage, an adjusted positive polarity end of a Gamma voltage, an adjusted Gamma voltage, and a liquid crystal voltage. In fig. 2, when the Data line voltage Data + jumps from Gray64 to Gray255, the common voltage VCOM voltage is synchronously fluctuated, and the fluctuation of the Gamma voltage outputted from the output end GM _ O of the Gamma voltage negative feedback circuit 11 of the present application is reflected as a change opposite to the common voltage, so that the influence on the liquid crystal voltage is mutually cancelled, and the horizontal crosstalk is improved.
According to the scheme, the voltage acquisition circuit 12 is arranged to acquire the Feedback voltage VCOM Feedback of the common voltage VCOM and transmit the Feedback voltage VCOM Feedback to the inverting end of the Gamma voltage negative Feedback circuit 11, and meanwhile, the initial Gamma voltage is input to the non-inverting end of the Gamma voltage negative Feedback circuit 11, so that the initial Gamma voltage is adjusted based on the Feedback voltage VCOM Feedback of the common voltage VCOM, the fluctuation of the adjusted Gamma voltage output by the negative Feedback circuit and the fluctuation of the Feedback voltage VCOM Feedback of the common voltage VCOM are in inverse phase change, and the influence of the fluctuation of the common voltage VCOM on the liquid crystal voltage is at least partially counteracted. Compared with the scheme of directly compensating the common voltage VCOM in the related art, the scheme of the invention for solving the technical problem of the horizontal crosstalk of the liquid crystal voltage does not directly compensate the common voltage VCOM, but compensates the Gamma voltage, and the compensated Gamma voltage acts on the pixel electrode through a lead, so that the compensation response to the common voltage VCOM is delayed because the capacitor connected with the common electrode on the color film substrate 20 is paved on the whole plate surface and has a larger capacitance value. Therefore, the method for improving the horizontal crosstalk according to the embodiment can have a faster compensation response and improve the compensation effect of the horizontal crosstalk.
The voltage acquisition circuit 12 may be constructed by a plurality of resistors, one end of the voltage acquisition circuit 12 is connected to the common electrode, and the other end is connected to the inverting terminal of the Gamma voltage negative feedback circuit 11 as a sampling output terminal, so as to introduce the variation of the common voltage VCOM into the adjustment of the Gamma voltage. The common voltage VCOM and the Feedback voltage VCOM Feedback of the common voltage VCOM may be the same, and may be scaled down equally. Both have the same trend of variation.
The brightness of each sub-pixel is determined by the Gamma voltage. The Gamma voltage is generally generated by a Gamma voltage setting circuit 13, and the Gamma voltage setting circuit 13 sets the Gamma voltage as a reference voltage for performing gray scale display of the liquid crystal panel based on a Gamma curve required by the liquid crystal display. Each Gamma voltage is input to a source driver circuit 30 of the liquid crystal panel, and a gradation voltage is generated through a digital-to-analog converter in the source driver circuit 30. Wherein, the Gamma curve is formed by fitting the gray scale and the transmittance curve of the display panel.
In this embodiment, the output terminal of the Gamma voltage setting circuit 13 is a Gamma voltage terminal, which transmits the initial Gamma voltage to the non-inverting terminal of the Gamma voltage negative feedback circuit 11. A Feedback voltage VCOM Feedback of the common voltage VCOM is connected to an inverting terminal of the Gamma voltage negative Feedback circuit 11. In this negative feedback circuit, the common voltage VCOM is used as an input signal of the negative feedback circuit, and when the fluctuation occurs, the "adjusted Gamma voltage" outputted from the negative feedback circuit is also changed accordingly, however, the "adjusted Gamma voltage" is fed back as a negative feedback signal to the inverting terminal of the operational amplifier AP and is superimposed on the common voltage VCOM, thereby showing a change tendency opposite to that of the common voltage VCOM. Therefore, the fluctuation of the adjusted Gamma voltage and the fluctuation of the Feedback voltage VCOM Feedback of the common voltage VCOM are inverted. The influence of the Gamma voltage on the liquid crystal through the source driving circuit 30 is opposite to the influence of the common voltage VCOM on the liquid crystal, so that the Gamma voltage and the common voltage VCOM are mutually offset, and the effect of improving the horizontal crosstalk inhibition is achieved.
The Gamma voltage feedback circuit 11 may be a voltage feedback circuit, and specifically, referring to fig. 3, fig. 3 is a circuit diagram of a Gamma voltage generating circuit according to an embodiment. In one embodiment, the Gamma voltage degeneration circuit 11 includes an operational amplifier AP and a first resistor R1; the in-phase end of the operational amplifier AP is electrically connected with a Gamma voltage end, the inverting end of the operational amplifier AP is electrically connected with a voltage acquisition circuit, and the output end GM _ O of the operational amplifier AP outputs the Gamma voltage; the first end of the first resistor R1 is connected to the output end GM _ O of the operational amplifier AP, and the second end of the first resistor R1 is connected to the inverting end of the operational amplifier AP.
In an embodiment, the Gamma voltage negative feedback circuit 11 further includes a second resistor R2, a first end of the second resistor R2 is connected to the inverting terminal of the operational amplifier AP, and a second end is electrically connected to the voltage acquisition circuit 12. The second resistor R2 is set to limit the current of the inverting terminal of the operational amplifier AP, so as to protect the inverting terminal from being burnt out due to excessive current.
Further, the Gamma voltage negative feedback circuit 11 further includes a first capacitor C1, and the first capacitor C1 is connected between the second end of the second resistor R2 and the voltage acquisition circuit 12.
The first capacitor C1 is configured to block dc components in the Feedback voltage VCOM Feedback of the common voltage VCOM, and cooperate with the second resistor R2 to increase the frequency response speed.
Referring to fig. 4, fig. 4 is a schematic structural diagram illustrating a structure of transmitting an adjusted Gamma voltage to a source driver circuit according to an embodiment. In one embodiment, the source driving circuit 30 transmits a data signal to the pixel electrode through the data line 40; the parasitic capacitance of the data conductor 40 is less than or equal to the first capacitance. The parasitic capacitance on the data conductor 40 is typically small and can quickly respond to the adjusted Gamma voltage fluctuations. Compared with the scheme of directly compensating the common voltage VCOM in the related art, the parasitic capacitance connected to the common electrode on the color film substrate 20 is spread over the whole surface, and the capacitance value is large, so that the compensation response to the common voltage VCOM is delayed. Therefore, the method for improving the horizontal crosstalk according to the embodiment can have a faster compensation response and improve the compensation effect of the horizontal crosstalk.
In one embodiment, the Gamma voltage terminal includes a negative polarity terminal, and the output terminal GM _ O of the Gamma voltage degeneration circuit 11 outputs the negative polarity voltage of the adjusted Gamma voltage to compensate the voltage crosstalk of the black-biased display.
Here, the Gamma voltage is a positive voltage greater than the common voltage VCOM, and the Gamma voltage is a negative voltage less than the common voltage VCOM. As the negative polarity voltage is lower, the negative output voltage of the source driving circuit 30 is made correspondingly lower, thereby increasing the liquid crystal voltage so that the luminance of the corresponding line (line corresponding to the black linear crosstalk) is made higher to compensate for the black linear voltage crosstalk.
Referring to fig. 5, fig. 5 is a diagram illustrating waveforms of the data line voltage, the common voltage VCOM, the positive terminal of the adjusted Gamma voltage, the negative terminal of the adjusted Gamma voltage, and the liquid crystal voltage. In fig. 5, the Data line voltage Data + causes the common voltage VCOM to fluctuate in a forward direction synchronously when jumping occurs, the Gamma negative polarity voltage GM _ O output by the output end GM _ O of the Gamma voltage negative feedback circuit 11 of the present application fluctuates in an opposite phase, which is opposite to the fluctuation of the common voltage VCOM, while the Gamma positive polarity voltage GM + _ O is not affected, so that the Gamma voltage is increased, and the black horizontal crosstalk is improved.
Further, in another embodiment, the Gamma voltage terminal includes a positive polarity terminal, and the output terminal GM _ O of the Gamma voltage negative feedback circuit 11 outputs the positive polarity voltage of the adjusted Gamma voltage to compensate for the voltage crosstalk of the off-white display. As described above, as the positive polarity voltage is lower, the positive output voltage of the source driving circuit 30 is also made correspondingly lower, thereby reducing the liquid crystal voltage so that the luminance of the corresponding line (the line corresponding to the white linear crosstalk) is lower, and thus the voltage crosstalk of the white display can be compensated well.
Referring to fig. 6, fig. 6 is a flowchart illustrating a Gamma voltage generating method according to an embodiment. The present application further provides a method for generating a Gamma voltage, which in an embodiment includes:
s51, obtaining a Feedback voltage VCOM Feedback of the common voltage VCOM of the color film substrate 20;
s52, inputting a Feedback voltage VCOM Feedback of a common voltage VCOM to a reverse end of a negative Feedback circuit, and inputting a Gamma voltage end to a same-phase end of the negative Feedback circuit; connecting an output end GM _ O of the Gamma voltage negative feedback circuit 11 to a reference voltage end of the source electrode driving circuit 30 so as to take the regulated Gamma voltage as the reference voltage of the source electrode driving circuit 30; the fluctuation of the adjusted Gamma voltage and the fluctuation of the common electrode Feedback voltage VCOM Feedback are in inverse phase change, so as to at least partially offset the influence of the fluctuation of the common voltage VCOM on the liquid crystal voltage.
Based on the above-mentioned embodiments of the Gamma voltage generation circuit, step S51 may be implemented by any one of the above-mentioned embodiments of the voltage acquisition circuit 12, and step S52 may be implemented by any one of the above-mentioned embodiments of the Gamma voltage negative feedback circuit 11.
The present application further provides a source driving circuit 30, where the source driving circuit 30 is configured to provide driving for a pixel array unit, the pixel array unit includes a first pixel unit, a second pixel unit, and a third pixel unit (corresponding to three colors of red, green, and blue), and the first pixel unit, the second pixel unit, and the third pixel unit are respectively and correspondingly provided with a first pixel electrode, a second pixel electrode, and a third pixel electrode, and the source driving circuit includes a first Gamma voltage generating circuit, a second Gamma voltage generating circuit, and a third Gamma voltage generating circuit, and the Gamma voltages are respectively provided for the first pixel electrode, the second pixel electrode, and the third pixel electrode. The Gamma voltage generating circuit refers to the above embodiments, and is not described herein again.
Specifically, the source driving circuit 30 further includes a data register, a level shifter, a digital-to-analog converter, and an output circuit. The data register receives and stores gray scale data of the display pixels; the latch is connected with the data register, latches the gray scale data in response to the gating signal, and outputs the latched gray scale data; the level shifter is connected with the latch and is used for performing level shifting on the gray scale data and then outputting the gray scale data; the digital-to-analog converter is respectively connected with the gamma voltage generating circuit and the level converter and outputs one of a plurality of gamma voltages according to the gray scale data; the input end of the output circuit is connected with the digital-to-analog converter, and the output end GM _ O is connected with the data line, receives the gamma voltage and drives the data line to the driving voltage corresponding to the gamma voltage. Here, the source driving circuit 30 may be embodied in the form of an integrated circuit.
Referring to fig. 7, fig. 7 is an exploded view of a display device according to an embodiment. The present application also proposes a display device including a backlight unit 6 and the display panel 1 in the above-described embodiment, and a housing 7 that accommodates the backlight unit 6 and the display panel 1; among them, the backlight unit 6 is used to provide a backlight light source to the display panel 1.
Specifically, the backlight unit 6 may be classified into a direct type and an edge type according to the optical arrangement of backlight light sources and application/non-application of a light guide plate. Fig. 7 illustrates an edge type backlight unit 6. In this case, the backlight unit 6 may include a light source 61, a light guide plate 62 guiding light emitted from the light source 61, a reflective sheet 63 disposed under the light guide plate 62, and at least one optical sheet 64. The light source 61 is disposed in at least one edge of the light guide plate 62. The light source 61 may include a Light Emitting Diode (LED) array, a Cold Cathode Fluorescent Lamp (CCFL), or a Hot Cathode Fluorescent Lamp (HCFL). Fig. 7 shows first and second LED arrays 611 and 612 disposed at opposite edges of the light guide plate 62. The first and second LED arrays 611 and 612 may be electrically connected to an inverter (not shown) to receive power therefrom.
The housing 7 may include a frame 71, a main body 72, and a rear cover 73. The rear cover 73 accommodates the backlight unit 6 and the display panel 1 therein. The rear cover 73 may include a metal material to secure strength against external vibration and be grounded.
The display panel 1 may be: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini-LED display panel, a field emission display panel, a plasma display panel, an electrophoresis display panel or an electrowetting display panel.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

1. A Gamma voltage generation circuit, comprising:
the voltage acquisition circuit is connected with a common electrode of the color film substrate to acquire a feedback voltage of the common voltage;
a Gamma voltage negative feedback circuit having a non-inverting terminal, an inverting terminal and an output terminal; the in-phase end is connected with a Gamma voltage end to receive initial Gamma voltage, and the inverting end is electrically connected with the voltage acquisition circuit to receive the feedback voltage of the public voltage;
the output end of the negative feedback circuit outputs the adjusted Gamma voltage as the reference voltage of the source electrode driving circuit; the fluctuation of the adjusted Gamma voltage and the fluctuation of the feedback voltage of the public voltage are in inverse phase change, so that the influence of the fluctuation of the public voltage on the liquid crystal voltage is at least partially counteracted.
2. The Gamma voltage generation circuit of claim 1, wherein the Gamma voltage negative feedback circuit comprises an operational amplifier and a first resistor;
the in-phase end of the operational amplifier is used for connecting the Gamma voltage end, the inverting end of the operational amplifier is used for electrically connecting the voltage acquisition circuit, and the output end of the operational amplifier outputs the regulated Gamma voltage;
the first end of the first resistor is connected to the output end of the operational amplifier, and the second end of the first resistor is connected to the inverting end of the operational amplifier.
3. The Gamma voltage generating circuit of claim 2, wherein the Gamma voltage negative feedback circuit further comprises a second resistor, a first end of the second resistor is connected to the inverting terminal of the operational amplifier, and a second end of the second resistor is electrically connected to the voltage collecting circuit.
4. The Gamma voltage generating circuit of claim 3, wherein the Gamma voltage negative feedback circuit further comprises a first capacitor connected between the second end of the second resistor and the voltage acquisition circuit.
5. The Gamma voltage generating circuit of claim 1, wherein the Gamma voltage terminal comprises a negative polarity terminal, and the output terminal of the Gamma voltage negative feedback circuit outputs the negative polarity voltage of the adjusted Gamma voltage to compensate for voltage crosstalk of a black-biased display.
6. The Gamma voltage generating circuit of claim 1, wherein the Gamma voltage terminal comprises a positive polarity terminal, and the output terminal of the Gamma voltage negative feedback circuit outputs the positive polarity voltage of the adjusted Gamma voltage to compensate for voltage crosstalk of the off-white display.
7. A method for generating Gamma voltage is characterized in that,
obtaining a feedback voltage of a common voltage on a common electrode of a color film substrate;
inputting the feedback voltage of the public voltage to an inverting terminal of a negative feedback circuit, and inputting a Gamma voltage terminal to a non-inverting terminal of the negative feedback circuit;
connecting the output end of the Gamma voltage negative feedback circuit to a reference voltage end of a source electrode driving circuit so as to take the regulated Gamma voltage as the reference voltage of the source electrode driving circuit; the fluctuation of the adjusted Gamma voltage and the fluctuation of the common electrode feedback voltage are in inverse phase change, so that the influence of the fluctuation of the common voltage on the liquid crystal voltage is at least partially counteracted.
8. A source electrode driving circuit is characterized in that the source electrode driving circuit is used for providing driving for a pixel array unit, the pixel array unit comprises a first pixel unit, a second pixel unit and a third pixel unit, and a first pixel electrode, a second pixel electrode and a third pixel electrode are respectively and correspondingly arranged;
the source driving circuit includes a Gamma voltage generating circuit for supplying Gamma voltages to the first, second and third pixel electrodes, respectively, wherein the Gamma voltage generating circuit is the Gamma voltage generating circuit according to any one of claims 1 to 7.
9. A display panel, comprising:
the pixel array unit comprises a first pixel unit, a second pixel unit and a third pixel unit which correspond to a first color, a second color and a third color, and the pixel array unit is correspondingly provided with a first pixel electrode, a second pixel electrode and a third pixel electrode;
a gate driving circuit supplying a scan signal to the pixel array unit;
a source driving circuit supplying a data signal to the pixel array unit; the source driving circuit according to claim 8.
10. A display device comprising a backlight unit for providing a backlight light source to the display panel, and the display panel as claimed in claim 9.
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